BATTERY AND ELECTRONIC DEVICE COMPRISING SAME

A battery includes: a positive electrode including a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode including a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator provided between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate includes a first region to which the negative active material is not applied and which faces the positive electrode tab, the first surface of the negative electrode substrate includes a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and the negative electrode includes an insulating layer disposed in at least a portion of the first region.

BACKGROUND

The disclosure relates to a battery and an electronic device including the same.

2. Description of Related Art

Recently, the demand for batteries is increasing due to an increase in the demand for portable electronic devices. For example, among various types of batteries, a lithium-ion battery is widely used in portable electronic devices due to advantages such as high energy density, high discharge voltage, and output stability.

A lithium-ion battery may include a negative electrode substrate to which a negative active material is applied, a positive electrode substrate to which a positive active material is applied, and a separator disposed between the negative electrode substrate and the positive electrode substrate.

One research subject in the field of batteries is improvement of safety. Lithium-ion batteries, which are commonly used in portable electronic devices, may cause accidents such as fire and explosion due to various factors such as an internal short, exceeding the allowed current (or voltage) during charging, temperature rise, and external shock.

In the related art, in order to prevent the above-mentioned accidents, in the active material (a positive active material or a negative active material) applied to an electrode plate (a positive electrode substrate or a negative electrode substrate), the active material in facing region (hereinafter, a “facing region”) facing a tab (a positive electrode tab or a negative electrode tab) is removed. However, the facing region from which the active material was removed may cause pressure imbalance during the manufacturing process of the battery due to a difference in thickness between the facing region from which the active material is removed and the remaining region to which the active material is applied. In addition, in the facing region from which the active material is removed, resistance may be locally increased. Such an increase in local resistance may cause accumulation of lithium (Li) in the electrolyte, which may eventually lead to swelling of the battery.

SUMMARY

Provided are a battery in which the thickness of the facing region from which the active material is removed is made to be uniform with the thickness of the other region to which the active material is applied, so that safety of the battery may be improved, and an electronic device including the battery.

According to an aspect of the disclosure, a battery includes: a positive electrode including a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode including a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator provided between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate includes a first region to which the negative active material is not applied and which faces the positive electrode tab, the first surface of the negative electrode substrate includes a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and the negative electrode includes an insulating layer disposed in at least a portion of the first region.

The insulating layer may include a first insulating layer disposed from the first region up to a peripheral region of the second region within a predetermined range from the first region.

The insulating layer may include a second insulating layer disposed in the first region.

An end of the positive electrode substrate and an end of the negative electrode substrate may not overlap.

The battery may further include a plurality of turn regions including a first turn region and a second turn region, and the positive electrode substrate, the separator, and the negative electrode substrate are wound in a jelly-roll type configuration.

The first region to which the negative active material is not applied may be disposed in a turn region, from among the plurality of turn regions, that is adjacent to a different turn region from among the plurality of turn regions, and the positive electrode tab may be disposed in the different turn region.

On the second surface of the negative electrode substrate, the negative active material may not be applied to a region corresponding to the first region.

According to an aspect of the disclosure, an electronic device includes: a memory; a processor; and a battery configured to supply power to the memory and the processor, wherein the battery includes: a positive electrode including a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode including a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator located between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate includes a first region to which the negative active material is not applied and which faces the positive electrode tab, wherein the first surface of the negative electrode substrate includes a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and wherein the negative electrode further includes an insulating layer disposed in at least a portion of the first region.

The insulating layer may include a first insulating layer disposed from the first region up to a peripheral region of the second region within a predetermined range from the first region.

The insulating layer may include a second insulating layer disposed in the first region.

The insulating layer may further include a third insulating layer disposed up to a peripheral region of the second region within a predetermined range from the first region and covering the first region in which the second insulating layer is disposed.

The insulating layer may include an insulative material.

The insulating layer may have a thickness corresponding to a thickness of the negative active material surrounding the first region.

The first surface of the positive electrode substrate further may include a third region and a fourth region, the positive active material may not be applied to the third region and the third region faces the negative electrode tab, the positive active material may be applied to the fourth region and the fourth region may be adjacent to the third region in a longitudinal direction of the negative electrode tab, and the positive electrode further may include an insulating layer disposed in at least a portion of the third region.

The third region to which the positive active material is not applied may be disposed in a turn region adjacent to a different turn region, and the negative electrode tab may be disposed in the different turn region.

According to one or more embodiments of the disclosure, a battery and an electronic device including the same are configured such that the thickness of the facing region from which the active material is removed is made to be uniform with the thickness of the other region to which the active material is applied, so that pressure during the manufacturing process of the battery may be uniformly transferred, an increase in local resistance generated in the facing region from which the active material is removed may be suppressed, and a dendrite phenomenon of the battery may be prevented.

In addition, various effects directly or indirectly identified through the disclosure may be provided.

In relation to the description of drawings, the same reference numbers may be assigned to the same or corresponding components.

DETAILED DESCRIPTION

Hereinafter, various embodiments of the disclosure will be described with reference to the accompanying drawings. However, it shall be understood that it is not intended to limit the disclosure to specific embodiments, and that the disclosure includes various modifications, equivalents, and/or alternatives of the embodiments of the disclosure.

FIG.1Ais a perspective view schematically illustrating a battery according to various embodiments of the disclosure.FIG.1Bis a perspective view schematically illustrating the battery in which some components according to various embodiments are exposed.

Referring toFIGS.1A and1B, the battery100may include an electrode assembly110including a positive electrode112, a separator116, and a negative electrode114.

In an embodiment, the electrode assembly110may be in a form of being sequentially wound from the central region101of the battery100.

According to an embodiment, the positive electrode112may include a positive electrode substrate, a positive active material applied to one surface of the positive electrode substrate, and a positive electrode tab121attached to the one surface.

According to an embodiment, the negative electrode114may include a negative electrode substrate, a negative active material applied to one surface of the negative electrode substrate, and a negative electrode tab123attached to one surface of the negative electrode substrate.

According to an embodiment, the separator116may be located between the positive electrode112and the negative electrode114.

According to an embodiment, the positive electrode substrate may be, for example, a metal made of aluminum, stainless steel, titanium, copper, silver, or a combination of materials selected from these. A positive active material may be applied to the surface of the positive electrode substrate. For example, the positive active material may be applied to each of both surfaces of the positive electrode substrate.

According to an embodiment, the positive active material may be made of a material capable of reversibly intercalating and deintercalating lithium ions. For example, the positive active material may include at least one material selected from a group consisting of a lithium transition metal oxide such as a lithium cobalt oxide, a lithium nickel oxide, a lithium nickel cobalt oxide, a lithium nickel cobalt aluminum oxide, a lithium nickel cobalt manganese oxide, a lithium manganese oxide, and a lithium iron phosphate, a nickel sulfide, a copper sulfide, sulfur, an iron oxide, and a vanadium oxide. According to an embodiment, the positive active material may be applied to both surfaces of the positive electrode substrate.

According to an embodiment, a binder and a conductive additive may be further applied to a surface of the positive electrode substrate in addition to the positive active material.

The binder may include at least one material selected from a group consisting of a polyvinylidene fluoride-containing binder such as a polyvinylidene fluoride, a vinylidene fluoride/hexafluoropropylene copolymer, a carboxymethyl cellulose-containing binder such as sodium-carboxymethyl cellulose and lithium-carboxymethyl cellulose, an acrylate-containing binder such as a polyacrylic acid, a lithium-polyacrylic acid, an acrylic, a polyacrylonitrile, a polymethyl methacrylate, and a polybutylacrylate, a polyimide-imide, a polytetrafluoroethylene, a polyethylene oxide, a polypyrrole, a lithium-Nafion, and a styrene butadiene rubber-containing polymer.

According to an embodiment, the conductive material may include at least one material selected from a group consisting of a carbon-containing conducting agent such as carbon black, carbon fiber, and graphite, conductive fiber such as metal fiber, metal powder such as carbon fluoride powder, metal powder such as carbon fluoride powder, aluminum powder, and nickel powder, conductive whisker such as zinc oxides and potassium titanate, a conductive metal oxide such as a titanium oxide, and a conductive polymer such as a polyphenylene derivative.

According to an embodiment, the positive electrode tab121may be attached to one end of the positive electrode substrate by, for example, ultrasonic welding. For example, the positive electrode tab121may be disposed at one end along the longitudinal direction of the positive electrode substrate. One end of the positive electrode substrate to which the positive electrode tab121is attached may be disposed adjacent to a starting point where the winding of the electrode assembly110starts. For example, one end of the positive electrode substrate to which the positive electrode tab121is attached may be disposed adjacent to the central region101of the battery100. Alternatively, the positive electrode tab121may include a plurality of positive electrode tabs121, and the plurality of positive electrode tabs121may be disposed at specific intervals along the longitudinal direction of the positive electrode substrate.

According to an embodiment, the negative electrode substrate may include, for example, at least one metal selected from a group consisting of copper, stainless steel, nickel, aluminum, and titanium. A negative active material may be applied to the surface of the negative electrode substrate. For example, the negative active material may be applied to each of both surfaces of the negative electrode substrate.

According to an embodiment, the negative active material may be made of a material capable of forming an alloy together with lithium or a material capable of reversibly intercalating and deintercalating lithium. For example, the negative active material may include at least one material selected from a group consisting of a metal, a carbon-containing material, a metal oxide, and a lithium metal nitride. According to an embodiment, the negative active material may be applied to both surfaces of the negative electrode substrate.

According to an embodiment, the carbon-containing material may include at least one material selected from a group consisting of graphite, graphite carbon fiber, coke, mesocarbon microbeads (MCMBS), polyacene, pitch-derived carbon fibers, and hard carbon.

According to an embodiment, the metal oxide may include at least one selected from a group consisting of a lithium titanium oxide, a titanium oxide, a molybdenum oxide, a niobium oxide, an iron oxide, a tungsten oxide, a tin oxide, an amorphous tin oxide composite, a silicon monoxide, a cobalt oxide, and a nickel oxide.

According to an embodiment, a binder and a conductive material may be further applied to a surface of the negative electrode substrate in addition to the negative active material. The binder and the conductive material may be the same as or similar to the binder and the conductive material applied to the positive electrode substrate.

According to an embodiment, the negative electrode tab123may be attached to one end of the negative electrode substrate. For example, the negative electrode tab123may be disposed at one end along the longitudinal direction of the negative electrode substrate. One end of the negative electrode substrate to which the negative electrode tab123is attached may be disposed adjacent to a starting point where the winding of the electrode assembly110starts. For example, one end of the negative electrode substrate to which the negative electrode tab123is attached may be disposed adjacent to the central region101of the battery100. Alternatively, the negative electrode tab123may include a plurality of negative electrode tabs123, and the plurality of negative electrode tabs123may be disposed at specific intervals along the longitudinal direction of the negative electrode substrate.

According to an embodiment, the separator116may be disposed between the positive electrode substrate and the negative electrode substrate to insulate the positive electrode substrate and the negative electrode substrate from each other. The separator116may be made of, for example, a porous polymer membrane such as a polyethylene or polypropylene membrane.

FIG.2is a plan view illustrating one surface of a positive electrode substrate or a negative electrode substrate according to an embodiment in an unwound state.

Referring toFIG.2, each of the positive electrode substrate112and the negative electrode substrate114according to an embodiment may be of a normal type in which an active material220(e.g., a positive active material or a negative active material) is not applied to an end of the substrate210(e.g., the positive electrode substrate112or the negative electrode substrate114) provided with an electrode tab230(e.g., the positive electrode tab121or the negative electrode tab123).

For example,FIG.2may be a plan view illustrating one surface of the positive electrode substrate112.

According to an embodiment, the positive electrode tab230may be attached to one end of the positive electrode substrate210, and the positive active material220may not be applied around the region to which the positive electrode tab230is attached. For example, a positive uncoated region to which the positive active material220is not applied may be provided at each end of the positive electrode substrate210. Accordingly, the positive active material220may not be applied to one end of the positive electrode substrate210to which the positive electrode tab230is attached.

According to an embodiment, the electrode assembly110in which the positive electrode substrate210, the separator, and the negative electrode substrate114are stacked may be wound k times (k is an integer) from the central region101of the battery100, and may include first to kthturn regions T1to Tk depending on the number of windings. For example, the first turn region T1may be a region in which the electrode assembly110is first wound to form a first turn, the second turn region T2may be a region in which the electrode assembly110forms the second turn while enclosing the periphery of the first turn region T2, and the kthregion Tk may be a region in which the electrode assembly110forms the kthturn while being wound last. InFIG.2, the dotted lines indicated in the vertical direction may indicate regions where the electrode assembly110is bent while being wound.

Referring toFIG.2, the positive electrode substrate210according to an embodiment may be provided with a positive uncoated region to correspond to the first turn region of the electrode assembly110, and a positive uncoated region may be provided to correspond to at least a portion of the kthturn region of the electrode assembly110.

FIG.2may be a plan view illustrating one surface of the negative electrode substrate114.

According to an embodiment, the negative electrode tab230may be attached to one end of the negative electrode substrate210, and the negative active material220may not be applied around the region to which the negative electrode tab230is attached. For example, a negative uncoated region to which the negative active material220is not applied may be provided at each end of the negative electrode substrate210. Accordingly, the negative active material220may not be applied to one end of the negative electrode substrate210to which the negative electrode tab230is attached.

According to an embodiment, like the positive electrode substrate112, the negative electrode substrate210may be provided with a negative uncoated region to correspond to the first turn region of the electrode assembly110, and a negative uncoated region may be provided to correspond to at least a portion of the kthturn region of the electrode assembly110.

In general, when the battery100receives an external shock or is charged abnormally, a short circuit phenomenon may occur in at least some regions, and when a short circuit occurs, large current unintended during design may flow. When large current flows through the positive electrode tab121, the temperature of the positive electrode tab121may increase, and the separator116around the positive electrode tab121may be contracted or deformed by the heat of the positive electrode tab121. In addition, since the positive electrode tab121or the negative electrode tab123forms a step in the substrate, when an external shock or external pressure is applied, deformation such as tearing of the separator116may occur. When the separator116is contracted or deformed, at least a portion of the positive electrode substrate112and at least a portion of the negative electrode substrate114may be short-circuited. When the positive electrode tab121and the negative active material are in contact with each other, a safety accident in which the battery100ignites or explodes due to a rapid increase in current may occur. According to various embodiments of the disclosure, in order to prevent ignition or explosion of the battery100due to the above problem, in the state in which the electrode assembly110is wound, the negative uncoated region and the positive electrode tab121may be disposed to overlap each other, and the positive uncoated region and the negative electrode tab123may be disposed to overlap each other.

According to various embodiments of the disclosure, since the negative uncoated region and the positive electrode tab121are disposed to overlap each other, even if the peripheral separator is deformed due to heat generated from the positive electrode tab121or the step occurring due to the positive electrode tab121, the positive electrode tab121is brought into contact with the negative uncoated region rather than the negative active material, which may make it possible to prevent ignition or explosion of the battery100. According to various embodiments of the disclosure, since the positive uncoated region overlaps the negative electrode tab, even if deformation such as tearing of the separator due to the step occurring due to the negative electrode tab, the negative electrode tab is brought into contact with the positive uncoated region rather than the positive active material, which may make it possible to prevent ignition or explosion of the battery100.

FIG.3is a plan view of a positive electrode substrate or a negative electrode substrate according to another embodiment.

Referring toFIG.3, each of the positive electrode substrate112and the negative electrode substrate114according to another embodiment may be of an expanded type in which an active material320(a positive active material or a negative active material) is applied up to an end of the substrate310(the positive electrode substrate112or the negative electrode substrate114) provided with an electrode tab330(the positive electrode tab121or the negative electrode tab123). In the battery100in which the positive electrode substrate112or the negative electrode substrate114is configured in an expanded type, the active material application area increases, and thus, the charging capacity may increase compared to the normal type illustrated inFIG.2.

For example,FIG.3may be a plan view illustrating one surface of the positive electrode substrate112or the negative electrode substrate114.

According to various embodiments, the positive active material320is applied to one end of the positive electrode substrate310to which the positive electrode tab330is attached, wherein an attachment region to which the positive electrode tab330is attached, the region311surrounding the attachment region, and a region312aoverlapping or facing the negative electrode tab may be a positive uncoated region on which the positive active material320is not applied. For example, the first turn region T1to which the positive electrode tab330is attached may be divided into a positive uncoated region to which the positive electrode tab330is attached and the positive active material320is not applied, and a positive active material region to which the positive active material320is applied.

According to various embodiments, the positive uncoated regions311and312ain the first turn region T1may include a tab-peripheral region311disposed to surround the region to which the positive electrode tab330is attached, and a first region312adisposed to overlap or face the negative electrode tab when the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) is wound. According to an embodiment, the width W2of each of the tab-peripheral region311and the first region312ain the longitudinal direction (the X direction in the drawing) of the positive electrode substrate112may be greater than the width W1of the positive electrode tab330or the negative electrode tab. Alternatively, the height H1of each of the tab-peripheral region311and the first region312ain the width direction (the Y direction in the drawing) of the positive electrode substrate112may be smaller than the height H2of the second region312bwhich is adjacent to the first region312ain the width direction and to which the positive active material is applied. For example, the first region312ais a positive uncoated region that overlaps or faces the negative electrode tab when the electrode assembly110is wound, wherein the first region312amay have a second width W2greater than the first width W1of the negative electrode tab and a first height H1in the width direction of the positive electrode substrate112. The tab-peripheral region311is a positive uncoated region, which is located in a region to which the positive electrode tab330is attached, and may have a width W2and height H1which are equal or similar to those of the first region312a.The second region312bis a positive active material region to which a positive active material is applied, wherein the second region312bmay be located adjacent to the first region312ain the width direction of the positive electrode substrate112and may have a second width W2equal to that of the first region312aand a second height H2greater than the first height H1of the first region312a.Alternatively, the first height H1may be greater than the second height H2.

According to an embodiment, the combined area of all the positive active material regions in the first turn region T1may be greater than the combined area of all the positive uncoated regions311and312a.Therefore, this embodiment of the disclosure may increase the charging capacity of the battery.

FIG.3may also be a plan view illustrating one surface of the negative electrode substrate114.

Like the positive active material, the negative active material320according to various embodiments may be applied up to one end of the negative electrode substrate310to which the negative electrode tab330is attached. However, the attachment region to which the negative electrode tab330is attached and the region311surrounding the attachment region may be negative uncoated regions to which the negative active material320is not applied. For example, the first turn region T1to which the negative electrode tab330is attached may be divided into a negative uncoated region311to which the negative electrode tab330is attached and the negative active material320is not applied, and a negative active material region to which the negative active material320is applied.

According to various embodiments, the negative uncoated regions311and312ain the first turn region T1may include a tab-peripheral region311disposed to surround the region to which the negative electrode tab330is attached, and a first region312adisposed to overlap or face the positive electrode tab when the electrode assembly110is wound. According to an embodiment, the width W2of each of the tab-peripheral region311and the first region312ain the longitudinal direction (the X direction in the drawing) of the negative electrode substrate112may be greater than the width W1of the positive electrode tab330or the positive electrode tab. Alternatively, the height H1of each of the tab-peripheral region311and the first region312ain the width direction (the Y direction in the drawing) of the negative electrode substrate112may be smaller than the height H2of the second region312bwhich is adjacent to the first region312ain the width direction and to which the negative active material is applied. For example, the first region312ais a negative uncoated region that overlaps or faces the positive electrode tab when the electrode assembly110is wound, wherein the first region312amay have a second width W2greater than the first width W1of the positive electrode tab and a first height H1in the width direction of the negative electrode substrate112. The tab-peripheral region311is a negative uncoated region, which is located in a region to which the negative electrode tab330is attached, and may have a width W2and height H1which are equal or similar to those of the first region312a.The second region312bis a negative active material region to which a negative active material is applied, wherein the second region312bmay be located adjacent to the first region312ain the width direction of the negative electrode substrate112and may have a second width W2equal to that of the first region312aand a second height H2greater than the first height H1of the first region312a.Alternatively, the first height H1may be greater than the second height H2.

According to an embodiment, the combined area of all the negative active material regions in the first turn region T1may be greater than the combined area of all the negative uncoated regions311and312a.Therefore, this embodiment of the disclosure may increase the charging capacity of the battery.

FIG.4Ais a cross-sectional view of a battery in a region to which a positive electrode tab and a negative electrode tab according to an embodiment are attached. For example,FIG.4Amay be a cross-sectional view of the battery100taken along line A-A′ inFIG.1A.

Referring toFIG.4A, the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) may take a form in which a positive electrode substrate410, a separator430, and a negative electrode substrate420are sequentially wound from the central region101of the battery100. In the positive electrode substrate410, positive active materials411and413may include a first positive active material411applied to the inner peripheral surface of the positive electrode substrate410and a second positive active material413applied to the outer peripheral surface of the positive electrode substrate410. In the negative electrode substrate420, negative active materials421and423may include a first negative active material421applied to the inner peripheral surface of the negative electrode substrate420and a second negative active material423applied to the outer peripheral surface of the negative electrode substrate420.

According to an embodiment, when wound, the electrode assembly110may be divided into a first turn region T1forming a first turn, a second turn region T2forming a second turn, and a third turn forming third turn region T3, . . . , a kthturn region Tk forming a kthturn. When viewed in a cross-section in a state in which the electrode assembly110is wound, each of the turn regions T1to Tk may be divided into an upper region and a lower region. For example, when viewed in the cross-section, the first turn region T1may be divided into a first turn upper region T1_U disposed at a relatively upper side and a first turn lower region T1_L disposed at a relatively lower side. When viewed in the cross-section, the second turn region T2may be divided into a second turn upper region T2_U disposed at a relatively upper side and a second turn lower region T2_L disposed at a relatively lower side. When viewed in the cross-section, the third turn region T3may be divided into a third turn upper region T3_U disposed at a relatively upper side and a third turn lower region T3_L disposed at a relatively lower side, and the regions subsequent to the third turn region T3may also be similar to the above-described example.

According to an embodiment, when the winding of the electrode assembly110starts from the first turn lower region T1_L, the first turn upper region T1_U may be bent from one side to be connected to the second turn lower region T2_L, the second turn upper region T2_U may also be bent at the one side to be connected to the third turn lower region T3_L, and the fourth turn upper region T4_U and the subsequent turn upper regions may also be similar to the above-described example. Alternatively, when the winding of the electrode assembly110starts from the first turn upper region T1_U, the first turn lower region T1_L may be bent from one side to be connected to the second turn upper region T2_U, the second turn lower region T2_L may also be bent at the one side to be connected to the third turn upper region T3_U, and the fourth turn lower region T4_L and the subsequent turn lower regions may also be similar to the above-described example. In the illustrated example, the winding of the electrode assembly110starts from the first turn lower region T1_L, but may not be limited thereto.

According to an embodiment, a positive electrode tab415may be attached to the positive electrode substrate410, and an insulating tape417may be attached on the positive electrode tab415. The insulating tape417may insulate the positive electrode tab415, and may prevent the positive electrode tab415from coming into direct contact with the separator430which might deform or damage the separator430.

According to an embodiment, a negative electrode tab425may be attached to the negative electrode substrate420, and an insulating tape427may be attached on the negative electrode tab425. The insulating tape427may insulate the negative electrode tab425, and may prevent the negative electrode tab425from coming into direct contact with the separator430which might deform or damage the separator430.

According to an embodiment, the facing portion or overlapping portion of the positive electrode tab415or the negative electrode tab425when the electrode assembly110is wound, the negative uncoated regions429aand429bor the positive uncoated regions419aand419bmay be provided. According to an embodiment, an insulating layer440may be disposed in at least one of the negative uncoated regions429aand429band the positive uncoated regions419aand419b.

According to an embodiment, the positive electrode tab415may be disposed on the outer peripheral surface of the positive electrode substrate410in the first turn upper region T1_U. For example, when the positive electrode tab415is disposed on the outer peripheral surface of the positive electrode substrate410in the first turn upper region T1_U, the positive electrode tab415may face the inner peripheral surface of the negative electrode substrate420disposed in the second turn upper region T2_U. In an embodiment, in the second turn upper region T2_U, the inner peripheral surface of the negative electrode substrate420may be provided with a negative uncoated region429bto face the positive electrode tab415. For example, the negative uncoated region429bprovided on the inner peripheral surface of the negative electrode substrate420in the second turn upper region T2_U may be the first region312aillustrated inFIG.3. Alternatively, in the second turn lower region T2_L, the outer peripheral surface of the negative electrode substrate420may be provided with a negative uncoated region429ato overlap the negative electrode tab425. According to various embodiments, the areas of the negative uncoated regions429aand429bmay be equal to the area of the positive electrode tab415(or the negative electrode tab425) or greater than the area of the positive electrode tab415(or the negative electrode tab425).

According to an embodiment, in the second turn lower region T2_L, the negative electrode tab425may be disposed on the inner peripheral surface of the negative electrode substrate420. For example, when the negative electrode tab425is disposed on the inner peripheral surface of the negative electrode substrate420in the second turn lower region T2_L, the negative electrode tab425may face the outer peripheral surface of the positive electrode substrate410disposed in the first turn lower region T1_L and may overlap the inner peripheral surface of the positive electrode substrate410disposed in the second turn lower region T2_L. According to an embodiment, the outer peripheral surface of the positive electrode substrate410disposed in the first turn lower region T1_L and the inner peripheral surface of the positive electrode substrate410disposed in the second turn lower region T2_L may be provided with positive uncoated regions419aand419bto overlap the negative electrode tab425. According to various embodiments, the areas of the positive uncoated regions419aand419bmay be equal to the area of the negative electrode tab425or greater than the area of the negative electrode tab425.

According to an embodiment, in a first portion450, the negative electrode substrate420, the first negative active material421, the separator430, the second positive active material413, and the positive electrode substrate410may be sequentially stacked. In an embodiment, the negative uncoated region429b(e.g., the first region312aofFIG.3) to which the first negative active material421is not applied may be aligned with the positive electrode tab415on the positive electrode substrate410.

According to an embodiment, in an extension460, the negative electrode substrate420, the second negative active material423, and the first positive active material411may extend along the separator430, which extends toward the first portion450, to overlap the first portion450. In an embodiment, when the extension460extends along the separator430, which extends toward the first portion450, a second portion470may be disposed to overlap the first portion450. In this case, in the first portion450and the second portion470, the negative electrode substrate420, the first negative active material421, the separator430, the second positive active material413, the positive electrode substrate410, the first positive active material411, the separator430, the second negative active material423, and the negative electrode substrate420may be sequentially stacked. In addition, in the first portion450and the second portion470disposed to face each other, the negative uncoated region429b,the positive electrode tab415, the positive uncoated region419b,and the negative uncoated region429amay be aligned with each other.

FIG.4Bis an enlarged cross-sectional view of a portion of a region to which a positive electrode tab and a negative electrode tab according to an embodiment are attached in a battery. In an embodiment,FIG.4Bmay be an enlarged view of the first portion450ofFIG.4A.

According to an embodiment, the first portion450may include at least one of a negative electrode substrate420, a first negative active material421, a separator430, an insulating tape417, a second positive active material413, and a positive electrode substrate410. For example, in the first portion450, the negative electrode substrate420, the first negative active material421, the separator430, the second positive active material413, and the positive electrode substrate410may be stacked in a direction substantially parallel to the x-axis direction. In various embodiments, the insulating tape417may be replaced with an insulative material, an insulating member, or the like.

According to an embodiment, the negative electrode substrate420may be provided with a negative uncoated region429b(the first region) to which the first negative active material421is not applied. In an embodiment, in the negative electrode substrate420, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420may include a first insulating layer441in order to compensate for the thickness difference occurring due to the negative uncoated region429b.In an embodiment, the first insulating layer441may be disposed from the negative uncoated region429bup to a peripheral region within a predetermined range from the negative uncoated region429b(e.g., a partial region to which the first negative active material421is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the negative electrode substrate420in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the negative uncoated region429bto the peripheral region. In this case, the first insulating layer441may fill a gap generated by the negative uncoated region429bbetween the negative electrode substrate420and the peripheral region. In addition, the first insulating layer441may have a thickness equal or similar to the thickness of the region other than the peripheral region (e.g., the region to which the negative active material421is applied), thereby allowing pressure to be uniformly transferred in the process of manufacturing the battery (e.g., the battery100inFIG.1A), suppressing an increase in local resistance generated in the negative uncoated region429b,and preventing swelling of the battery100.

According to an embodiment, the positive electrode substrate410may include a positive electrode tab415. In an embodiment, the positive electrode tab415may be aligned with the negative uncoated region429bin the z-axis direction.

FIG.4Cis an enlarged cross-sectional view of a portion of a region to which a positive electrode tab and a negative electrode tab according to an embodiment are attached in a battery. In an embodiment,FIG.4Cmay be a view illustrating the overlapping structure of the first portion450and the second portion470extending toward the first portion450inFIG.4A.

According to an embodiment, the overlapping portion480may include an overlapping structure of the first portion450and the second portion470. In an embodiment, the overlapping portion480may include at least one of a negative electrode substrate420, a first negative active material421, a separator430, an insulating tape417, a second positive active material413, a positive electrode substrate410, a first positive active material411, a separator430, a second negative active material423, and a negative electrode substrate420. For example, in the overlapping portion480, the negative electrode substrate420, the first negative active material421, the separator430, the insulating tape417, the second positive active material413, the positive electrode substrate410, the first positive active material411, the separator430, the second negative active material423, and the negative electrode substrate420may be stacked in a direction substantially parallel to the x-axis direction.

According to an embodiment, the negative uncoated region429b(first region) to which the first negative active material421is not applied may be provided on the negative electrode substrate420of the first portion450. In an embodiment, in the negative electrode substrate420of the first portion450, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420of the first portion450may include a first insulating layer441in order to compensate for the thickness difference occurring due to the negative uncoated region429b.In an embodiment, the first insulating layer441may be disposed from the negative uncoated region429bup to a peripheral region within a predetermined range from the negative uncoated region429b(e.g., a partial region to which the first negative active material421is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the negative electrode substrate420in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the negative uncoated region429bto the peripheral region. In this case, the first insulating layer441may fill a gap generated by the negative uncoated region429bbetween the negative electrode substrate420and the peripheral region.

According to an embodiment, the negative uncoated region429a(first region) to which the second negative active material423is not applied may be provided on the negative electrode substrate420of the second portion470. In an embodiment, in the negative electrode substrate420of the second portion470, due to the negative uncoated region429a,a predetermined thickness (e.g., the thickness corresponding to the thickness of the second negative active material423) difference may occur in the z-axis direction between the negative uncoated region429aand the region which surrounds the negative uncoated region429aand to which the second negative active material423is applied.

According to an embodiment, the negative electrode substrate420of the second portion470may include a first insulating layer441in order to compensate for the thickness difference occurring due to the negative uncoated region429a.In an embodiment, the first insulating layer441may be disposed from the negative uncoated region429aup to a peripheral region within a predetermined range from the negative uncoated region429a(e.g., a partial region to which the second negative active material423is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the negative electrode substrate420in the −z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the −z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the negative uncoated region429ato the peripheral region. In this case, the first insulating layer441may fill a gap generated by the negative uncoated region429abetween the negative electrode substrate420and the peripheral region. In an embodiment, the first insulating layer441disposed on the negative electrode substrate420of the second portion470may be disposed to be symmetrical with the first insulating layer441disposed on the negative electrode substrate420of the first portion450.

According to an embodiment, the positive electrode substrate410may include a positive electrode tab415. In an embodiment, the positive electrode tab415may be aligned with the negative uncoated regions429aand429bin the z-axis direction.

According to various embodiments, the overlapping portion480ofFIG.4Cmay be included not only in a jelly-roll type battery (e.g., the battery100ofFIG.1A or1B) illustrated inFIG.4A, but also in any type of battery to which the overlapping portion480is applicable (e.g., a spec-type structure). For example, when applied to a battery having a spec-type structure, the overlapping portion480ofFIG.4Cmay be disposed substantially horizontally from one side to the other side of the battery having the spec-type structure, corresponding to the shape of the spec-type structure.

FIG.4Dis an enlarged cross-sectional view of a portion of a region to which a positive electrode tab and a negative electrode tab according to an embodiment are attached in a battery. In an embodiment,FIG.4Dmay be a view illustrating the overlapping structure of the first portion450and the second portion470extending toward the first portion450inFIG.4A.

According to an embodiment, the overlapping portion480may include an overlapping structure of the first portion450and the second portion470. In an embodiment, the overlapping portion480may include at least one of a negative electrode substrate420, a first negative active material421, a separator430, an insulating tape417, a second positive active material413, a positive electrode substrate410, a first positive active material411, a separator430, a second negative active material423, and a negative electrode substrate420. For example, in the overlapping portion480, the negative electrode substrate420, the first negative active material421, the separator430, the insulating tape417, the second positive active material413, the positive electrode substrate410, the first positive active material411, the separator430, the second negative active material423, and the negative electrode substrate420may be stacked in a direction substantially parallel to the x-axis direction.

According to an embodiment, the negative uncoated region429b(a first region) to which the first negative active material421is not applied may be provided on the negative electrode substrate420of the first portion450. In an embodiment, in the negative electrode substrate420of the first portion450, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420of the first portion450may include a second insulating layer442in order to compensate for the thickness difference occurring due to the negative uncoated region429b.In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429b.For example, the second insulating layer442may be in contact with the negative electrode substrate420in the z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the first negative active material421in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429b.In addition, the second insulating layer442may have a thickness equal or similar to the thickness of the region to which the negative active material421is applied, thereby allowing pressure to be uniformly transferred in the process of manufacturing the battery (e.g., the battery100inFIG.1A), suppressing an increase in local resistance generated in the negative uncoated region429b,and preventing swelling of the battery100.

According to an embodiment, the positive electrode substrate410may be provided with a negative uncoated region419b(the third region) to which the first positive active material411is not applied. In an embodiment, in the positive electrode substrate410, due to the positive uncoated region419b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first positive active material411) difference may occur in the z-axis direction between the positive uncoated region419band the region which surrounds the positive uncoated region419band to which the first positive active material411is applied.

According to an embodiment, the positive electrode substrate410may include a first insulating layer441in order to compensate for the thickness difference occurring due to the positive uncoated region419b.In an embodiment, the first insulating layer441may be disposed from the positive uncoated region419bup to a peripheral region within a predetermined range from the positive uncoated region419b(e.g., a partial region to which the first positive active material411is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the positive electrode substrate410in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the positive uncoated region419bto the peripheral region. In this case, the first insulating layer441may fill a gap generated by the positive uncoated region419bbetween the positive electrode substrate410and the peripheral region. In addition, the first insulating layer441may have a thickness equal or similar to the thickness of the region other than the peripheral region (e.g., the region to which the negative active material421is applied), thereby allowing pressure to be uniformly transferred in the process of manufacturing the battery (e.g., the battery100inFIG.1A), suppressing an increase in local resistance generated in the negative uncoated region429b,and preventing swelling of the battery100.

According to an embodiment, the negative uncoated region429a(a first region) to which the second negative active material423is not applied may be provided on the negative electrode substrate420of the second portion470. In an embodiment, in the negative electrode substrate420of the second portion470, due to the negative uncoated region429a,a predetermined thickness (e.g., the thickness corresponding to the thickness of the second negative active material423) difference may occur in the z-axis direction between the negative uncoated region429aand the region which surrounds the negative uncoated region429aand to which the second negative active material423is applied.

According to an embodiment, the negative electrode substrate420of the second portion470may include a second insulating layer442in order to compensate for the thickness difference occurring due to the negative uncoated region429a.In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429a.For example, the first insulating layer441may be in contact with the negative electrode substrate420in the z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the second negative active material423in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429a.In an embodiment, the second insulating layer442disposed on the negative electrode substrate420of the second portion470may be disposed to be symmetrical with the second insulating layer442disposed on the negative electrode substrate420of the first portion450.

According to an embodiment, the positive electrode substrate410may include a positive electrode tab415. In an embodiment, the positive electrode tab415may be aligned with the negative uncoated regions429aand429band the positive uncoated region419bin the z-axis direction.

According to various embodiments, the overlapping portion480ofFIG.4Dmay be included not only in a jelly-roll type battery (e.g., the battery100ofFIG.1A or1B) illustrated inFIG.4A, but also in any type of battery to which the overlapping portion480is applicable (e.g., a spec-type structure). For example, when applied to a battery having a spec-type structure, the overlapping portion480ofFIG.4Dmay be disposed substantially horizontally from one side to the other side of the battery having the spec-type structure, corresponding to the shape of the spec-type structure.

FIG.4Eis an enlarged cross-sectional view of a portion of a region to which a positive electrode tab and a negative electrode tab according to an embodiment are attached in a battery. In an embodiment,FIG.4Emay be a view illustrating the overlapping structure of the first portion450and the second portion470extending toward the first portion450inFIG.4A.

According to an embodiment, the overlapping portion480may include an overlapping structure of the first portion450and the second portion470. In an embodiment, the overlapping portion480may include at least one of a negative electrode substrate420, a first negative active material421, a separator430, an insulating tape417, a second positive active material413, a positive electrode substrate410, a first positive active material411, a separator430, a second negative active material423, and a negative electrode substrate420. For example, in the overlapping portion480, the negative electrode substrate420, the first negative active material421, the separator430, the insulating tape417, the second positive active material413, the positive electrode substrate410, the first positive active material411, the separator430, the second negative active material423, and the negative electrode substrate420may be stacked in a direction substantially parallel to the x-axis direction.

According to an embodiment, the negative uncoated region429b(a first region) to which the first negative active material421is not applied may be provided on the negative electrode substrate420of the first portion450. In an embodiment, in the negative electrode substrate420of the first portion450, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420of the first portion450may include at least one of a second insulating layer442and a third insulating layer443in order to compensate for the thickness difference occurring due to the negative uncoated region429b.

In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429b.For example, the second insulating layer442may be in contact with the negative electrode substrate420in the z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the first negative active material421in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429b.In addition, the second insulating layer442may have a thickness equal or similar to the thickness of the region to which the negative active material421is applied, thereby allowing pressure to be uniformly transferred in the process of manufacturing the battery (e.g., the battery100inFIG.1A), suppressing an increase in local resistance generated in the negative uncoated region429b,and preventing swelling of the battery100.

In an embodiment, the third insulating layer443may be disposed from the negative uncoated region429bup to a peripheral region within a predetermined range from the negative uncoated region429b(e.g., a partial region to which the first negative active material421is applied). For example, a portion (e.g., the central portion) of the third insulating layer443may be in contact with the second insulating layer442in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the third insulating layer443may be in contact with the peripheral region in the z-axis direction. In this case, the third insulating layer443may fill a gap between the second insulating layer442and the peripheral region. In addition, the second insulating layer443may have a thickness equal or similar to the thickness of the region other than the peripheral region (e.g., the region to which the negative active material421is applied), thereby allowing pressure to be uniformly transferred in the process of manufacturing the battery (e.g., the battery100inFIG.1A), suppressing an increase in local resistance generated in the negative uncoated region429b,and preventing swelling of the battery100.

According to an embodiment, the positive electrode substrate410may be provided with a negative uncoated region419b(the third region) to which the first positive active material411is not applied. In an embodiment, in the positive electrode substrate410, due to the positive uncoated region419b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first positive active material411) difference may occur in the z-axis direction between the positive uncoated region419band the region which surrounds the positive uncoated region419band to which the first positive active material411is applied.

According to an embodiment, the positive electrode substrate410may include a first insulating layer441in order to compensate for the thickness difference occurring due to the positive uncoated region419b.In an embodiment, the first insulating layer441may be disposed from the positive uncoated region419bup to a peripheral region within a predetermined range from the positive uncoated region419b(e.g., a partial region to which the first positive active material411is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the positive electrode substrate410in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the negative uncoated region429bto the peripheral region. In this case, the first insulating layer441may fill a gap generated by the negative uncoated region429bbetween the negative electrode substrate420and the peripheral region.

According to an embodiment, the negative uncoated region429a(a first region) to which the second negative active material423is not applied may be provided on the negative electrode substrate420of the second portion470. In an embodiment, in the negative electrode substrate420of the second portion470, due to the negative uncoated region429a,a predetermined thickness (e.g., the thickness corresponding to the thickness of the second negative active material423) difference may occur in the z-axis direction between the negative uncoated region429aand the region which surrounds the negative uncoated region429aand to which the second negative active material423is applied.

According to an embodiment, the negative electrode substrate420of the second portion470may include at least one of a second insulating layer442and a third insulating layer443in order to compensate for the thickness difference occurring due to the negative uncoated region429a.In an embodiment, the second insulating layer442and the third insulating layer443disposed on the negative electrode substrate420of the second portion470may be disposed to be symmetrical with the second insulating layer442and the third insulating layer443disposed on the negative electrode substrate420of the first portion450.

In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429a.For example, the second insulating layer442may be in contact with the negative electrode substrate420in the −z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the second negative active material423in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429a.

In an embodiment, the third insulating layer443may be disposed from the negative uncoated region429aup to a peripheral region within a predetermined range from the negative uncoated region429a(e.g., a partial region to which the second negative active material423is applied). For example, a portion (e.g., the central portion) of the third insulating layer443may be in contact with the second insulating layer442in the −z-axis direction, and the remaining portion (e.g., the peripheral portion) of the third insulating layer443may be in contact with the peripheral region in the −z-axis direction. In this case, the third insulating layer443may fill a gap between the second insulating layer442and the peripheral region.

According to an embodiment, the positive electrode substrate410may include a positive electrode tab415. In an embodiment, the positive electrode tab415may be aligned with the negative uncoated regions429aand429band the positive uncoated region419bin the z-axis direction.

According to various embodiments, the overlapping portion480ofFIG.4Emay be included not only in a jelly-roll type battery (e.g., the battery100ofFIG.1A or1B) illustrated inFIG.4A, but also in any type of battery to which the overlapping portion480is applicable (e.g., a spec-type structure). For example, when applied to a battery having a spec-type structure, the overlapping portion480ofFIG.4Emay be disposed substantially horizontally from one side to the other side of the battery having the spec-type structure, corresponding to the shape of the spec-type structure.

FIG.5is a cross-sectional view of a battery in a region to which a positive electrode tab and a negative electrode tab according to an exemplary embodiment are not attached. For example,FIG.5may be a cross-sectional view of the battery100taken along line B-B′ inFIG.1A.

Referring toFIG.5, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to an embodiment, except for a partial region to which a positive electrode tab415and a negative electrode tab425are attached, negative active materials421and423or positive active materials411and413may be applied, as illustrated inFIG.3.

For example, as illustrated inFIG.4A, when the positive electrode tab415is disposed on the outer peripheral surface of the positive electrode substrate410in the first turn upper region T1_U, a negative active material421may be applied to the inner peripheral surface of the negative electrode substrate420disposed in the second turn upper region T2_U and facing the positive electrode tab415, except for a partial region overlapping the positive electrode tab415.

Alternatively, as illustrated inFIG.4A, when the negative electrode tab425is disposed on the inner peripheral surface of the negative electrode substrate420in the second turn lower region T2_L, negative active materials411and413may be applied to the outer peripheral surface of the positive electrode substrate410disposed in the first turn lower region T1_L and the inner peripheral surface of the positive electrode substrate410disposed in the second turn lower region T2_L, except for a partial region facing or overlapping the negative electrode tab425.

According to various embodiments of the disclosure, while providing positive uncoated regions419aand419band negative uncoated regions429aand429bto compensate for a step of the positive electrode tab415or the negative electrode tab425, the positive uncoated regions419aand419band the negative uncoated regions429aand429bare arranged only in a partial region that faces or overlaps the positive electrode tab415or the negative electrode tab425, whereby it is possible to increase an active material application area, and thus to increase the capacity of the battery100. In various embodiments, in the uncoated region of the positive electrode tab415or the negative electrode tab425to which an active material (a positive active material or a negative active material) is not applied, an insulating layer having a thickness that is equal or similar to that of the active material (e.g., the insulating layers441to443shown inFIGS.4B to4E) may be disposed. In this case, the insulating layers441to443may allow pressure to be uniformly transferred during the manufacturing process of the battery100, suppress an increase in local resistance generated in the negative uncoated region429b,and prevent swelling of the battery100.

FIG.6Ais a view illustrating an arrangement structure of an electrode assembly according to an embodiment.

For example, the arrangement structure of the electrode assembly illustrated inFIG.6A(e.g., the electrode assembly110inFIG.1AorFIG.1B) may be of an alignment type in which the negative uncoated regions429aand429bor the positive uncoated regions419aand419bare disposed in a facing portion or an overlapping portion of the positive electrode tab415or the negative electrode tab425when the assembly110is wound, as illustrated inFIG.4A. Hereinafter, an arrangement structure and a stacked structure of the electrode assembly110will be described with reference toFIGS.4A and6A.

Referring toFIGS.4A and6A, the arrangement structure of the electrode assembly110according to an embodiment may be of a type in which the positions of respective ends of the positive electrode substrate410and the negative electrode substrate420(e.g., an end601of the positive electrode substrate and an end603of the negative electrode substrate) do not coincide with each other. For example, the electrode assembly110may be previously aligned such that the number of turns of the positive electrode substrate410is greater than the number of turns of the negative electrode substrate420by one time. For example, the positive electrode substrate410may be shifted to one side from the negative electrode substrate420by a length corresponding to the first turn region T1, and the positive electrode tab415may be disposed to the outer peripheral surface of the positive electrode substrate410to correspond to the first turn upper region T1_U.

According to an embodiment of the disclosure, when the positive electrode tab is disposed in the nthturn region, the negative electrode substrate may be provided with a negative uncoated region overlapping the positive electrode tab in a portion of the (n−1)thturn region and/or the (n+1)thturn region of the electrode assembly110. Alternatively, when the negative electrode tab is disposed in the mthturn region, the positive electrode substrate may be provided with a positive uncoated region overlapping the negative electrode tab in a portion of the (m−1)thturn region and/or the (m+1)thturn region of the electrode assembly110.

For example, in a region of the first turn upper region T1_U to which the positive electrode tab415is attached, and a region of the first turn lower region T1_L which overlaps the negative electrode tab425, the outer peripheral surface of the positive electrode substrate410may be provided with a positive uncoated region419a,and the remaining area may be applied with the second positive active material413. According to an embodiment, the inner peripheral surface of the positive electrode substrate410may be applied with the first positive active material411from the second turn region T2. Since the inner peripheral surface of the positive electrode substrate410overlaps the negative electrode tab425in the second turn lower region T2_L, the positive uncoated region419bmay be provided in a portion of the second turn lower region T2_L, and the remaining region may be applied with the first positive active material411.

For example, the negative electrode substrate420may be disposed to be wound from the region corresponding to the second turn region T2, and the negative electrode tab425may be attached to the inner peripheral surface to correspond to the second turn lower region T2_L. For example, in a region of the second turn lower region T2_L to which the negative electrode tab425is attached, and a region of the second turn upper region T2_U which faces the positive electrode tab415, the inner peripheral surface of the negative electrode substrate420may be provided with a negative uncoated region429b,and the remaining area may be applied with the first negative active material421. In the second turn lower region T2_L, the outer peripheral surface of the negative electrode substrate420may be provided with the negative uncoated region429ain a partial region overlapping the negative electrode tab425, and the remaining region may be applied with the second negative active material423.

FIG.6Bis a view illustrating a portion of an arrangement structure of an electrode assembly according to an embodiment. In an embodiment,FIG.6Bmay be a view illustrating the inner peripheral surface of the negative electrode and the outer peripheral surface of the positive electrode ofFIG.6A.

Referring toFIG.6B, a first arrangement structure610according to an embodiment may be of an alignment type in which a positive electrode tab415is disposed in a negative uncoated region429b(a first region) when the inner peripheral surface of a negative electrode substrate (e.g., the negative electrode substrate420inFIG.4A) and the outer peripheral surface of a positive electrode substrate (e.g., the positive electrode substrate410inFIG.4A) are wound. For example, the inner peripheral surface of the negative electrode substrate420and the outer peripheral surface of the positive electrode substrate410wound according to the first arrangement structure610may correspond to those of the alignment type illustrated in the first portion450ofFIG.4A.

According to an embodiment, the negative electrode substrate420may include a negative uncoated region429bto which the first negative active material (e.g., the negative active material421inFIG.4A) is not applied. For example, the negative uncoated region429bmay be provided in the second turn upper region T2_U. In an embodiment, in the negative electrode substrate420, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420may include a first insulating layer441(e.g., the first insulating layer441inFIG.4B) in order to compensate for the thickness difference occurring due to the negative uncoated region429b.In an embodiment, the first insulating layer441may be disposed from the negative uncoated region429bup to a peripheral region within a predetermined range from the negative uncoated region429b(e.g., a partial region to which the first negative active material421is applied). For example, a portion (e.g., the central portion) of the first insulating layer441may be in contact with the negative electrode substrate420in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the first insulating layer441may be in contact with the peripheral region in the z-axis direction. In an embodiment, the first insulating layer441may be continuously disposed from the negative uncoated region429bto the peripheral region. In this case, the first insulating layer441may fill a gap generated by the negative uncoated region429bbetween the negative electrode substrate420and the peripheral region.

According to various embodiments, the first arrangement structure610may have a structure in which the negative electrode substrate420and the positive electrode substrate410are arranged oppositely. For example, in the first arrangement structure610, a negative electrode tab (e.g., the negative electrode tab425inFIG.6A) may be disposed on the negative electrode substrate420, and a positive uncoated region (e.g., the positive uncoated region419ainFIG.6A) may be disposed on the positive electrode substrate410. In various embodiments, a first insulating layer441may be disposed in the positive uncoated region419a.

FIG.6Cis a view illustrating a portion of an arrangement structure of an electrode assembly according to an embodiment. In an embodiment,FIG.6Cmay be a view illustrating the inner peripheral surface of the negative electrode and the outer peripheral surface of the positive electrode ofFIG.6A.

Referring toFIG.6C, a second arrangement structure620according to an embodiment may be of an alignment type in which a positive electrode tab415is disposed in a negative uncoated region429b(a first region) when the inner peripheral surface of a negative electrode substrate (e.g., the negative electrode substrate420inFIG.4A) and the outer peripheral surface of a positive electrode substrate (e.g., the positive electrode substrate410inFIG.4A) are wound. For example, the inner peripheral surface of the negative electrode substrate420and the outer peripheral surface of the positive electrode substrate410wound according to the second arrangement structure620may correspond to those of the alignment type illustrated in the first portion450ofFIG.4A.

According to an embodiment, the negative electrode substrate420may include a negative uncoated region429bto which the first negative active material (e.g., the negative active material421inFIG.4A) is not applied. For example, the negative uncoated region429bmay be provided in the second turn upper region T2_U. In an embodiment, in the negative electrode substrate420, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420may include a second insulating layer442(e.g., the second insulating layer442inFIG.4D) in order to compensate for the thickness difference occurring due to the negative uncoated region429b.In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429b.For example, the second insulating layer442may be in contact with the negative electrode substrate420in the z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the first negative active material421in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429b.

According to various embodiments, the second arrangement structure620may have a structure in which the negative electrode substrate420and the positive electrode substrate410are arranged oppositely. For example, in the second arrangement structure620, a negative electrode tab (e.g., the negative electrode tab425inFIG.6A) may be disposed on the negative electrode substrate420, and a positive uncoated region (e.g., the positive uncoated region419ainFIG.6A) may be disposed on the positive electrode substrate410. In various embodiments, a second insulating layer442may be disposed in the positive uncoated region419a.

FIG.6Dis a view illustrating a portion of an arrangement structure of an electrode assembly according to an embodiment. In an embodiment,FIG.6Dmay be a view illustrating the inner peripheral surface of the negative electrode and the outer peripheral surface of the positive electrode ofFIG.6A.

Referring toFIG.6D, a third arrangement structure630according to an embodiment may be of an alignment type in which a positive electrode tab415is disposed in a negative uncoated region429b(a first region) when the inner peripheral surface of a negative electrode substrate (e.g., the negative electrode substrate420inFIG.4A) and the outer peripheral surface of a positive electrode substrate (e.g., the positive electrode substrate410inFIG.4A) are wound. For example, the inner peripheral surface of the negative electrode substrate420and the outer peripheral surface of the positive electrode substrate410wound according to the third arrangement structure630may correspond to those of the alignment type illustrated in the first portion450ofFIG.4A.

According to an embodiment, the negative electrode substrate420may include a negative uncoated region429bto which the first negative active material (e.g., the negative active material421inFIG.4A) is not applied. For example, the negative uncoated region429bmay be provided in the second turn upper region T2_U. In an embodiment, in the negative electrode substrate420, due to the negative uncoated region429b,a predetermined thickness (e.g., the thickness corresponding to the thickness of the first negative active material421) difference may occur in the z-axis direction between the negative uncoated region429band the region which surrounds the negative uncoated region429band to which the first negative active material421is applied.

According to an embodiment, the negative electrode substrate420may include at least one of a second insulating layer442(e.g., the second insulating layer442inFIG.4E) and a third insulating layer443(e.g., the third insulating layer443inFIG.4E) in order to compensate for the thickness difference occurring due to the negative uncoated region429b.

In an embodiment, the second insulating layer442may be disposed in the negative uncoated region429b.For example, the second insulating layer442may be in contact with the negative electrode substrate420in the z-axis direction. In an embodiment, the second insulating layer442may have a thickness equal or similar to that of the first negative active material421in order to compensate for the thickness difference generated in the negative electrode substrate420due to the negative uncoated region429b.

In an embodiment, the third insulating layer443may be disposed from the negative uncoated region429bup to a peripheral region within a predetermined range from the negative uncoated region429b(e.g., a partial region to which the first negative active material421is applied). For example, a portion (e.g., the central portion) of the third insulating layer443may be in contact with the second insulating layer442in the z-axis direction, and the remaining portion (e.g., the peripheral portion) of the third insulating layer443may be in contact with the peripheral region in the z-axis direction. In this case, the third insulating layer443may fill a gap between the second insulating layer442and the peripheral region.

According to various embodiments, the third arrangement structure630may have a structure in which the negative electrode substrate420and the positive electrode substrate410are arranged oppositely. For example, in the third arrangement structure630, a negative electrode tab (e.g., the negative electrode tab425inFIG.6A) may be disposed on the negative electrode substrate420, and a positive uncoated region (e.g., the positive uncoated region419ainFIG.6A) may be disposed on the positive electrode substrate410. In various embodiments, at least one of a second insulating layer442and a third insulating layer443may be disposed in the positive uncoated region419a.

FIG.7is a cross-sectional view of a battery in a region to which a positive electrode tab and a negative electrode tab according to another embodiment are attached. For example,FIG.7may be a cross-sectional view of the battery100taken along line A-A′ inFIG.1A.

Referring toFIG.7, unlike the electrode assembly110illustrated inFIG.4A, in an electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to another embodiment, the negative electrode substrate420may be provided with negative uncoated regions701and703on the inner and outer peripheral surfaces facing the positive electrode tab415. For example, on the inner peripheral surface of the negative electrode substrate420, a negative uncoated region701may be provided in a portion of the second turn upper region T2_U facing the positive electrode tab415. On the outer peripheral surface of the negative electrode substrate420, a negative uncoated region703may be provided in a portion of the second turn upper region T2_U facing the positive electrode tab415.

In various embodiments, in the negative electrode substrate420, due to the negative uncoated regions701and703, a predetermined thickness (e.g., the thickness corresponding to the thicknesses of the negative active materials421and423) difference may occur between the negative uncoated regions701and703and the regions which surround the negative uncoated regions701and703and to which the negative active materials421and423are applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated regions701and703.

FIG.8is a cross-sectional view illustrating an arrangement structure of an electrode assembly according to an embodiment.

For example, the arrangement structure of the electrode assembly illustrated inFIG.8(e.g., the electrode assembly110inFIG.1AorFIG.1B) may be of an alignment type in which the negative uncoated regions701and703or the positive uncoated regions419aand419bare disposed in a facing portion or an overlapping portion of the positive electrode tab415or the negative electrode tab425when the assembly110is wound, as illustrated inFIG.7.

Unlike the arrangement structure of the electrode assembly110illustrated inFIG.6A, the arrangement structure of the electrode assembly110illustrated inFIG.8may be provided with a negative uncoated region803on the outer peripheral surface, as well as a negative uncoated region801(e.g., the negative uncoated region429binFIG.4A) on the inner peripheral surface corresponding to the second turn upper region T2_U.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420inFIG.8), due to the negative uncoated regions801and803, a predetermined thickness (e.g., the thickness corresponding to the thicknesses of the negative active materials421and423) difference may occur between the negative uncoated regions801and803and the regions which surround the negative uncoated regions801and803and to which the negative active materials (e.g., the negative active materials421and423inFIG.8) are applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated regions801and803.

FIG.9is a cross-sectional view of a battery in a region to which a positive electrode tab and a negative electrode tab according to still another embodiment are attached.

For example,FIG.9may be a cross-sectional view of the battery100taken along line A-A′ inFIG.1A.

Referring toFIG.9, unlike the electrode assembly110illustrated inFIG.4A, in an electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to another embodiment, one end of the positive electrode substrate410to which a positive active material is applied may extend to a region901overlapping the positive electrode tab415. For example, when the positive electrode tab415is disposed in the upper region T1_U of the first turn, the pressure due to the step of the positive electrode tab415may damage the separator430and bring the positive electrode tab415and the negative active material421above or below the positive electrode tab415into direct contact with each other and thus cause ignition or explosion. In an embodiment of the disclosure, since one end of the positive electrode substrate410applied with the positive active material extends to a region overlapping the positive electrode tab415, even if the separator430is damaged due to the step of the positive electrode tab415, it is possible to prevent ignition or explosion since the positive electrode tab415comes into contact with the positive electrode substrate410which has the same polarity as the positive electrode tab415and overlaps the lower portion of the positive electrode tab415, rather than a negative electrode substrate410.

In various embodiments, due to the negative uncoated region429a(or the positive uncoated region419b) in the negative electrode substrate420(or the positive electrode substrate410), a predetermined thickness (e.g., the thickness corresponding to the thickness of the active material423or411) difference may occur between the negative uncoated region429aand the region which surrounds the negative uncoated region429a(or the positive uncoated region419b) and to which the second negative active material423(or the first positive active material411) is applied. In various embodiments, the negative electrode substrate420(or the positive electrode substrate410) may include an insulating layer (e.g., the insulating layer441to443inFIGS.4B to4E) in order to compensate for the thickness difference occurring due to the negative uncoated region429a(or the positive uncoated region419b).

FIG.10is a view illustrating a modified example of a battery structure according to another embodiment. For example,FIG.10may be a cross-sectional view of the battery100taken along line A-A′ inFIG.1A.

Referring toFIG.10, unlike the electrode assembly110illustrated inFIG.9, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to an embodiment of the disclosure, a positive electrode tab1020(e.g., the positive electrode tab415) may be attached to the inner peripheral surface of the positive electrode substrate410. When the positive electrode tab1020is attached to the inner peripheral surface of the positive electrode substrate410, the pressure due to the step of the positive electrode tab1020may be reduced from the standpoint of the negative electrode substrate420located outside (above) the positive electrode tab1020. However, since the positive electrode tab1020is attached to the inner peripheral surface, the downward pressure of the positive electrode tab1020is increased. Thus, in an embodiment of the disclosure, as indicated by reference numeral1010, the positive active material (e.g., positive active material411or413) may extend up to a region in which one end of the positive electrode substrate410and the positive electrode tab1020overlap each other.

In various embodiments, due to the negative uncoated region429a(or the positive uncoated region419b) in the negative electrode substrate420(or the positive electrode substrate410), a predetermined thickness (e.g., the thickness corresponding to the thickness of the active material423or411) difference may occur between the negative uncoated region429aand the region which surrounds the negative uncoated region429a(or the positive uncoated region419b) and to which the second negative active material423(or the first positive active material411) is applied. In various embodiments, the negative electrode substrate420(or the positive electrode substrate410) may include an insulating layer (e.g., the insulating layer441to443inFIGS.4B to4E) in order to compensate for the thickness difference occurring due to the negative uncoated region429a(or the positive uncoated region419b).

FIG.11is a view illustrating another modified example of a battery structure according to another embodiment. For example,FIG.11may be a cross-sectional view of the battery100taken along line A-A′ inFIG.1A.

Referring toFIG.11, unlike the electrode assembly110illustrated inFIG.9, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to an embodiment of the disclosure, a positive electrode tab1120(e.g., the positive electrode tab415) may be attached to the inner peripheral surface of the positive electrode substrate410. When the positive electrode tab1120is attached to the inner peripheral surface of the positive electrode substrate410, the pressure due to the step of the positive electrode tab1120may be reduced from the standpoint of the negative electrode substrate420located outside (above) the positive electrode tab1120. However, since the positive electrode tab1120is attached to the inner peripheral surface, the downward pressure of the positive electrode tab1120is increased. Thus, in an embodiment of the disclosure, as indicated by reference numeral1110, the inner peripheral surface overlapping the lower portion of the positive electrode tab415at one end of the negative electrode substrate420may be provided with a negative uncoated region to which a negative active material is applied. For example, when the positive electrode tab1120is attached to the inner peripheral surface of the positive electrode substrate410in the first turn upper region T1_U, the negative uncoated region1110may be provided since the end region of the inner peripheral surface of the negative electrode substrate420overlaps the lower portion of the positive electrode tab415in the first turn lower region T1L. However, in the area overlapping the lower portion of the positive electrode tab415, a negative active material423may be applied to the outer peripheral surface of the negative electrode tab420.

In various embodiments, due to the negative uncoated region429a(or the positive uncoated region419b) in the negative electrode substrate420(or the positive electrode substrate410), a predetermined thickness (e.g., the thickness corresponding to the thickness of the active material423or411) difference may occur between the negative uncoated region429aand the region which surrounds the negative uncoated region429a(or the positive uncoated region419b) and to which the second negative active material423(or the first positive active material411) is applied. In various embodiments, the negative electrode substrate420(or the positive electrode substrate410) may include an insulating layer (e.g., the insulating layer441to443inFIGS.4B to4E) in order to compensate for the thickness difference occurring due to the negative uncoated region429a(or the positive uncoated region419b).

FIG.12is a view illustrating a portion of a cross section of a negative electrode substrate or a positive electrode substrate according to an embodiment.

Referring toFIG.12, when the battery100according to an embodiment of the disclosure is configured in a normal type to be the same as or similar to the example illustrated inFIG.2, an active material1230(e.g., the positive active material411or413or the negative active material421or423) may extend to a region in which a substrate1220to which an electrode tab1210(e.g., the positive electrode tab121or the negative electrode tab123) is attached is bent. When the active material1230is also applied to the region in which the substrate1220is bent, separation of the active material1230may be prevented, and the capacity of the battery100may be increased.

FIG.13is a view illustrating an active material application region of a negative electrode substrate or a positive electrode substrate according to an embodiment. For example,FIG.13may be a plan view illustrating the negative electrode substrate or the positive electrode substrate illustrated inFIG.12in an unwound state.

Referring toFIG.13, the battery100according to an embodiment of the disclosure may be configured in a normal type to be the same as or similar to the example illustrated inFIG.2. For example, a positive electrode tab1310(e.g., the positive electrode tab415) may be attached to one end of the substrate, and the first turn region T1around the positive electrode tab1310may be provided with a positive uncoated region to which a positive active material1320(e.g., the positive active material411or413) is not applied. According to an embodiment, a partial region of the positive uncoated region may be an overlapping portion1330overlapping a negative electrode tab133, and unlike the example illustrated inFIG.2, a positive active material1320application region may extend to a boundary point between a bending region BA and the overlapping portion1330. According to various embodiments, the overlapping portion1330may be a region that faces or overlaps the negative electrode tab (e.g., the negative electrode tab425) in the wound state.

According to various embodiments, each of the positive electrode substrate112and the negative electrode substrate114, and the inner and outer peripheral surfaces of each of the substrates112and114may have structures to which the normal type illustrated inFIG.2or the expansion type as illustrated inFIG.3is selectively applied. The details will be described below.

In various embodiments, due to a positive uncoated region (e.g., the positive uncoated region419binFIG.11), in the positive electrode substrate (e.g., the positive electrode substrate410inFIG.11), a predetermined thickness (e.g., the thickness corresponding to the positive active material1320) difference may occur between the positive uncoated region and the area to which the positive active material1320is applied. In various embodiments, the positive electrode substrate410may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region419b.

FIG.14is a view illustrating an arrangement structure of an electrode assembly according to a first embodiment.

Referring toFIG.14, in the electrode assembly110according to the first embodiment, a positive electrode substrate1410may be configured in a normal type, and a negative electrode substrate1420may be configured in an expansion type.

For example, a first positive active material1411may be applied to the outer peripheral surface of the positive electrode substrate1410, wherein the first positive active material1411may be applied only to a portion before the region to which the positive electrode tab1415is attached, so that a positive uncoated region may be provided at the end of the outer peripheral surface adjacent to the positive electrode tab1415. According to an embodiment, the first positive active material1411application region may extend to the bending region BA adjacent to the positive electrode tab1415.

Alternatively, a second positive active material1413may be applied to the inner peripheral surface of the positive electrode substrate1410, wherein the second positive active material1413may be applied only to a portion before the region to which the positive electrode tab1415is attached, so that a positive uncoated region may be provided at the end of the inner peripheral surface adjacent to the positive electrode tab1415. According to an embodiment, as indicated by reference numeral1417, the inner peripheral surface of the positive electrode substrate1410may be provided, in a region overlapping the negative electrode tab1425, with a positive uncoated region to which the second positive active material1413is not applied.

Additionally, the first negative active material1421may be applied to the inner peripheral surface of the negative electrode substrate1420, wherein the first negative active material1421may be applied up to the end of the inner peripheral surface to which the negative electrode tab1425is attached. According to an embodiment, around the region to which the negative electrode tab1425is attached and in a first region1427which overlaps the positive electrode tab1415when the electrode assembly110is wound, the inner peripheral surface of the negative electrode substrate1420may be provided with a negative uncoated region to which the first negative active material1421is not applied.

Alternatively, a second negative active material1423may be applied to the outer peripheral surface of the negative electrode substrate1420, wherein the second negative active material1423may be applied up to the end of the outer peripheral surface to which the negative electrode tab1415is attached. According to an embodiment, the region1429overlapping the negative electrode tab1425on the outer peripheral surface of the negative electrode substrate1420may be provided with a negative uncoated region to which the second negative active material1423is not applied.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420in FIG.11), due to the negative uncoated region1427, a predetermined thickness (e.g., the thickness corresponding to the thickness of the negative active material421or423) difference may occur between the negative uncoated region1427and the region which surrounds the negative uncoated region1427and to which the negative active material (e.g., the negative active material421or423inFIG.11) is applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region1427.

FIG.15is a view illustrating an arrangement structure of an electrode assembly according to a second embodiment.

Referring toFIG.15, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to the second embodiment, a positive electrode substrate1510may be configured in a normal type, and a negative electrode substrate1520may be configured in a normal type and an expansion type.

For example, the structure of the positive electrode substrate1510may be similar to that of the positive electrode substrate1410illustrated inFIG.14. For example, a first positive active material1511may be applied to the outer peripheral surface of the positive electrode substrate1510, wherein the first positive active material1511may be applied only to a portion before the region to which the positive electrode tab1515is attached, so that a positive uncoated region may be provided at the end of the outer peripheral surface adjacent to the positive electrode tab1515. According to an embodiment, the first positive active material1511application region may extend to a first bending region BA1adjacent to the positive electrode tab1515.

Alternatively, a second positive active material1513may be applied to the inner peripheral surface of the positive electrode substrate1510, wherein the second positive active material1513may be applied only to a portion before the region to which the positive electrode tab1515is attached, so that a positive uncoated region may be provided at the end of the inner peripheral surface adjacent to the positive electrode tab1515. According to an embodiment, on the inner peripheral surface of the positive electrode substrate1510, as indicated by reference numeral1517, a positive uncoated region to which the second positive active material1513is not applied is provided in a region overlapping the negative electrode tab1525.

Additionally, a first negative active material1521may be applied to the inner peripheral surface of the negative electrode substrate1520, wherein the first negative active material1521may be applied only to a portion before the region to which the negative electrode tab1525is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1525. According to an embodiment, the first negative active material1521application region may extend to a second bending region BA2adjacent to the negative electrode tab1525. According to an embodiment, in a first region1527which overlaps the positive electrode tab1515when the electrode assembly110is wound, the inner peripheral surface of the negative electrode substrate1520may be provided with a negative uncoated region to which the first negative active material1521is not applied.

Alternatively, a second negative active material1523may be applied to the outer peripheral surface of the negative electrode substrate1520, wherein the second negative active material1523may be applied up to the end of the outer peripheral surface to which the negative electrode tab1515is attached. According to an embodiment, the region1529overlapping the negative electrode tab1525on the outer peripheral surface of the negative electrode substrate1520may be provided with a negative uncoated region to which the second negative active material1523is not applied.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420in FIG.11), due to the negative uncoated region1527, a predetermined thickness (e.g., the thickness corresponding to the thickness of the negative active material421or423) difference may occur between the negative uncoated region1527and the region which surrounds the negative uncoated region1527and to which the negative active material (e.g., the negative active material421or423inFIG.11) is applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region1527.

FIG.16is a view illustrating an arrangement structure of an electrode assembly according to a third embodiment.

Referring toFIG.16, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to an embodiment of the disclosure, the positive electrode substrate1610and the negative electrode substrate1620may be configured in a normal type.

For example, the structure of the positive electrode substrate1610may be similar to that of the positive electrode substrate1410illustrated inFIG.14. For example, a first positive active material1611may be applied to the outer peripheral surface of the positive electrode substrate1610, wherein the first positive active material1611may be applied only to a portion before the region to which the positive electrode tab1615is attached, so that a positive uncoated region may be provided at the end of the outer peripheral surface adjacent to the positive electrode tab1615. According to an embodiment, the first positive active material1611application region may extend to a first bending region BA1adjacent to the positive electrode tab1615.

Alternatively, a second positive active material1613may be applied to the inner peripheral surface of the positive electrode substrate1610, wherein the second positive active material1613may be applied only to a portion before the region to which the positive electrode tab1615is attached, so that a positive uncoated region may be provided at the end of the inner peripheral surface adjacent to the positive electrode tab1615. According to an embodiment, on the inner peripheral surface of the positive electrode substrate1610, as indicated by reference numeral1617, a positive uncoated region to which the second positive active material1613is not applied is provided in a region overlapping the negative electrode tab1625.

Additionally, a first negative active material1621may be applied to the inner peripheral surface of the negative electrode substrate1620, wherein the first negative active material1621may be applied only to a portion before the region to which the negative electrode tab1625is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1625. According to an embodiment, the first negative active material1621application region may extend to a second bending region BA2adjacent to the negative electrode tab1625. According to an embodiment, in a first region1627which overlaps the positive electrode tab1515when the electrode assembly110is wound, the inner peripheral surface of the negative electrode substrate1620may be provided with a negative uncoated region to which the first negative active material1621is not applied.

Alternatively, a second negative active material1623may be applied to the outer peripheral surface of the negative electrode substrate1620, wherein the second negative active material1623may be applied only to a portion before the region to which the negative electrode tab1625is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1625. According to an embodiment, the second negative active material1623application region may extend to a second bending region BA2adjacent to the negative electrode tab1625.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420in FIG.11), due to the negative uncoated region1627, a predetermined thickness (e.g., the thickness corresponding to the thickness of the negative active material421or423) difference may occur between the negative uncoated region1627and the region which surrounds the negative uncoated region1627and to which the negative active material (e.g., the negative active material421or423inFIG.11) is applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region1627.

FIG.17is a view illustrating an arrangement structure of an electrode assembly according to a fourth embodiment.

Referring toFIG.17, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to the fourth embodiment, the positive electrode substrate1710and the negative electrode substrate1720may be configured in a normal type.

For example, the structure of the positive electrode substrate1710may differ from the positive electrode substrate1610illustrated inFIG.16in the shape of the positive uncoated region on the inner peripheral surface of the positive electrode substrate1710. For example, a first positive active material1711may be applied to the outer peripheral surface of the positive electrode substrate1710, wherein the first positive active material1711may be applied only to a portion before the region to which the positive electrode tab1715is attached, so that a positive uncoated region may be provided at the end of the outer peripheral surface adjacent to the positive electrode tab1715. According to an embodiment, the first positive active material1711application region may extend to the bending region BA adjacent to the positive electrode tab1715.

Alternatively, a second positive active material1713may be applied to the inner peripheral surface of the positive electrode substrate1710, wherein the second positive active material1713may be applied only to a portion before the region to which the positive electrode tab1715is attached, so that a positive uncoated region may be provided at the end of the inner peripheral surface adjacent to the positive electrode tab1715. According to an embodiment, on the inner peripheral surface of the positive electrode substrate1710, a positive uncoated region to which the second positive active material1713is not applied is provided in a first region1717overlapping the negative electrode tab1725, and the second positive active material1713may be applied to the second region1719adjacent to the first region1717in the width direction (the vertical direction in the drawing) of the positive electrode substrate1710. That is, in the first and second regions1717and1719, the second positive active material1713may be applied in a form having a step.

Alternatively, in another embodiment of the disclosure, the second positive active material1713may not be applied to the first and second regions1717and1719. However, in another embodiment of the disclosure, in order to increase the charging capacity, the second positive active material1713may be applied to extend up to the boundary region between the first and second regions1717and1719. Accordingly, the second positive active material1713may extend while covering a bending region adjacent to the first and second regions1717and1719(e.g., a region located between the second turn lower region T2_L and the second turn upper region T2_U).

The structure of the negative electrode substrate1720may differ from the negative electrode substrate1620illustrated inFIG.16in the shape of the negative uncoated region on the inner peripheral surface of the negative electrode substrate1720. For example, a first negative active material1721may be applied to the inner peripheral surface of the negative electrode substrate1720, wherein the first negative active material1721may be applied only to a portion before the region to which the negative electrode tab1725is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1725. According to an embodiment, on the inner peripheral surface of the negative electrode substrate1720, a negative uncoated region to which the first negative active material1721is not applied is provided in a third region1727overlapping the positive electrode tab1715, and the first negative active material1721may be applied to the fourth region1729adjacent to the third region1727in the width direction (the vertical direction in the drawing) of the negative electrode substrate1720. That is, in the third and fourth regions1727,1729the first negative active material1723may be applied in a form having a step.

Alternatively, in another embodiment of the disclosure, the first negative active material1721may not be applied to the third and fourth regions1727and1729. However, in another embodiment of the disclosure, in order to increase the charging capacity, the first negative active material1721may be applied to extend up to the boundary region between the third and fourth regions1727and1729. Accordingly, the first negative active material1721may extend while covering a bending region adjacent to the third and fourth regions1727and1729(e.g., a region located between the second turn upper region T2_U and the third turn lower region T3_L).

A second negative active material1723may be applied to the outer peripheral surface of the negative electrode substrate1720, wherein the second negative active material1723may be applied only to a portion before the region to which the negative electrode tab1725is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1725.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420in FIG.11), due to the negative uncoated region1727, a predetermined thickness (e.g., the thickness corresponding to the thickness of the negative active material421or423) difference may occur between the negative uncoated region1727and the region which surrounds the negative uncoated region1727and to which the negative active material (e.g., the negative active material421or423inFIG.11) is applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region1727.

FIG.18is a view illustrating an arrangement structure of an electrode assembly according to a fifth embodiment.

Referring toFIG.18, in the electrode assembly (e.g., the electrode assembly110inFIG.1AorFIG.1B) according to the fifth embodiment, the positive electrode substrate1810and the negative electrode substrate1820may be configured in a normal type.

For example, the structure of the positive electrode substrate1810may differ from the positive electrode substrate1710illustrated inFIG.17in the shape of the positive active material1811application region on the inner peripheral surface of the positive electrode substrate1710. For example, a first positive active material1811may be applied to the outer peripheral surface of the positive electrode substrate1810, wherein the first positive active material1811may be applied only to a portion before the region to which the positive electrode tab1815is attached, so that a positive uncoated region may be provided at the end of the outer peripheral surface adjacent to the positive electrode tab1815.

Alternatively, a second positive active material1813may be applied to the inner peripheral surface of the positive electrode substrate1810, wherein the second positive active material1813may be applied only to a portion before the region to which the positive electrode tab1815is attached, so that a positive uncoated region may be provided at the end of the inner peripheral surface adjacent to the positive electrode tab1815. According to an embodiment, on the inner peripheral surface of the positive electrode substrate1810, a positive uncoated region may be provided in a first region1817overlapping the negative electrode tab1825and a second region1819adjacent to the first region1817in the width direction of the positive electrode substrate1810(the vertical direction in the drawing).

Additionally, a first negative active material1821may be applied to the inner peripheral surface of the negative electrode substrate1820, wherein the first negative active material1821may be applied only to a portion before the region to which the negative electrode tab1825is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1825. According to an embodiment, on the inner peripheral surface of the negative electrode substrate1820, a negative uncoated region to which the first negative active material1823is not applied may be provided in a third region1827overlapping the positive electrode tab1815.

Alternatively, a second negative active material1823may be applied to the outer peripheral surface of the negative electrode substrate1820, wherein the second negative active material1823may be applied only to a portion before the region to which the negative electrode tab1825is attached, so that a negative uncoated region may be provided at the end of the inner peripheral surface adjacent to the negative electrode tab1825.

In various embodiments, in the negative electrode substrate (e.g., the negative electrode substrate420in FIG.11), due to the negative uncoated region1827, a predetermined thickness (e.g., the thickness corresponding to the thickness of the negative active material421or423) difference may occur between the negative uncoated region1827and the region which surrounds the negative uncoated region1827and to which the negative active material (e.g., the negative active material421or423inFIG.11) is applied. In various embodiments, the negative electrode substrate420may include an insulating layer (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the negative uncoated region1827.

FIG.19Ais a view schematically illustrating an assembly process of a battery according to an embodiment.FIG.19Bis a view schematically illustrating the assembly process of the battery according to an embodiment.FIG.19Cis a view schematically illustrating the assembly process of the battery according to an embodiment.

For example,FIGS.19A to19Cmay be views sequentially illustrating an insulating tape attaching process according to an embodiment.

A conventional assembly process may include a process of attaching an insulating tape in order to prevent an active material1920from falling off from a boundary region1925of the active material1920coated on a substrate1910, and to prevent the electrode tab from coming into contact with an active material of different polarity.

The process of attaching an insulating tape of a battery according to an embodiment may include a first process of attaching a first insulating tape (e.g., the insulating tape417or427) to cover the electrode tab, and a process of attaching a second insulating tape to cover the electrode tab and a boundary region.

For example, as illustrated inFIG.19A, the active material1920(e.g., the positive active material411or413or the negative active material421or423) is provided on the substrate1910(e.g., the positive electrode substrate410or the negative electrode substrate420), and a process of providing an electrode tab1930(e.g., the positive electrode tab415or the negative electrode tab425) may be executed, so that a substrate1910including the electrode tab1930and the active material1920may be provided.

Subsequently, as illustrated inFIG.19B, a process of enclosing the electrode tab1930and an attachment area to which the electrode tab is attached by using the first insulating tape1940(e.g., a process of enclosing the attachment region311) may be executed.

Subsequently, as illustrated inFIG.19C, a process of attaching the second insulating tape1950to cover both the electrode tab1930and the boundary region1925may be executed.

According to various embodiments, the process of attaching the insulating tape of the battery may include a first process of attaching the first insulating tape to cover the electrode tab, and a second process of attaching the second insulating tape to cover the electrode tab and the boundary region1925, whereby the insulating tape covering the electrode tab may be provided in a double structure. According to an embodiment of the disclosure, by covering the electrode tab in the double structure, it is possible to prevent ignition or explosion that may occur when a portion of an active material comes into contact with the electrode tab.

FIG.20is a view illustrating one surface of a positive electrode substrate or a negative electrode substrate according to an embodiment in an unwound state.

Referring toFIG.20, an electrode plate2010(e.g., the positive electrode substrate410inFIG.4or a negative electrode substrate (e.g., the negative electrode substrate420inFIG.4)) according to an embodiment may include a plurality of electrode tabs2030(e.g., the positive electrode tab415or the negative electrode tab425inFIG.4). In an embodiment, the plurality of electrode tabs2030may be disposed at a predetermined interval.

In an embodiment, the electrode plate2010may include a plurality of different electrode plates2010. In an embodiment, to correspond to a region overlapping a plurality of electrode tabs2030(the positive electrode tab415or the negative electrode tab425) attached to any one of the plurality of electrode plates2010(the positive electrode substrate410or the negative electrode substrate420), another electrode plate2010(the positive electrode substrate410or the negative electrode plate420) among the plurality of electrode plates2010may be provided with a plurality of uncoated regions2040(e.g., the positive uncoated regions419aand419bor the negative uncoated regions429aand429b.

In an embodiment, the electrode plate2010may be disposed to be wound from a region corresponding to the second turn region T2, and electrode tabs2030may be attached to the inner peripheral surface to correspond to the second turn lower region T2_L. For example, in the region to which the electrode tabs2030are attached in the second turn lower region T2_L and the region facing the other tabs (e.g., the positive electrode tab415or the negative electrode tab425) in the second turn upper region T2_U, the inner peripheral surface of the electrode plate2010may be provided with uncoated regions2040, and the remaining regions of the inner peripheral surface of the electrode plate2010may be applied with active materials (positive active materials411and413or negative active materials421and423). On the outer peripheral surface of the electrode plate2010, uncoated regions2040may be provided in partial regions overlapping other electrode tabs (the positive electrode tab415or the negative electrode tab425) in the second turn lower region T2_L, and the remaining regions may be applied with active materials (positive active materials411and413or negative active materials421and423).

In various embodiments, in the electrode plate2010, due to the uncoated regions2040, a predetermined thickness (the thickness corresponding to the thickness of the active materials) difference may occur between the uncoated regions2040and the regions which surround the uncoated regions2040and to which the active materials (the positive active materials411and413or the negative active materials421and423) are applied. In various embodiments, the electrode substrate2010may include insulating layers (e.g., the insulating layers441to443inFIGS.4B to4E) to compensate for the thickness difference occurring due to the uncoated regions2040.

FIG.21is a block diagram illustrating an electronic device2101in a network environment2100according to various embodiments.

Referring toFIG.21, the electronic device2101in the network environment2100that may communicate with an electronic device2102via a first network2198(e.g., a short-range wireless communication network), or at least one of an electronic device2104or a server2108via a second network2199(e.g., a long-range wireless communication network). According to an embodiment, the electronic device2101may communicate with the electronic device2104via the server2108. According to an embodiment, the electronic device2101may include a processor2120, memory2130, an input module2150, a sound output module2155, a display module2160, an audio module2170, a sensor module2176, an interface2177, a connecting terminal2178, a haptic module2179, a camera module2180, a power management module2188, a battery2189, a communication module2190, a subscriber identification module (SIM)2196, or an antenna module2197. In some embodiments, at least one of the components (e.g., the connecting terminal2178) may be omitted from the electronic device2101, or one or more other components may be added in the electronic device2101. In some embodiments, some of the components (e.g., the sensor module2176, the camera module2180, or the antenna module2197) may be implemented as a single component (e.g., the display module2160).

The processor2120may execute, for example, software (e.g., a program2140) to control at least one other component (e.g., a hardware or software component) of the electronic device2101coupled with the processor2120, and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor2120may store a command or data received from another component (e.g., the sensor module2176or the communication module2190) in volatile memory2132, process the command or the data stored in the volatile memory2132, and store resulting data in non-volatile memory2134. According to an embodiment, the processor2120may include a main processor2121(e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor2123(e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor2121. For example, when the electronic device2101includes the main processor2121and the auxiliary processor2123, the auxiliary processor2123may be adapted to consume less power than the main processor2121, or to be specific to a specified function. The auxiliary processor2123may be implemented as separate from, or as part of the main processor2121.

The memory2130may store various data used by at least one component (e.g., the processor2120or the sensor module2176) of the electronic device2101. The various data may include, for example, software (e.g., the program2140) and input data or output data for a command related thererto. The memory2130may include the volatile memory2132or the non-volatile memory2134.

The program2140may be stored in the memory2130as software, and may include, for example, an operating system (OS)2142, middleware2144, or an application2146.

The input module2150may receive a command or data to be used by another component (e.g., the processor2120) of the electronic device2101, from the outside (e.g., a user) of the electronic device2101. The input module2150may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

The sound output module2155may output sound signals to the outside of the electronic device2101. The sound output module2155may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record. The receiver may be used for receiving incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker.

The display module2160may visually provide information to the outside (e.g., a user) of the electronic device2101. The display module2160may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display module2160may include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of force incurred by the touch.

The audio module2170may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module2170may obtain the sound via the input module2150, or output the sound via the sound output module2155or a headphone of an external electronic device (e.g., an electronic device2102) directly (e.g., wiredly) or wirelessly coupled with the electronic device2101.

The interface2177may support one or more specified protocols to be used for the electronic device2101to be coupled with the external electronic device (e.g., the electronic device2102) directly (e.g., wiredly) or wirelessly. According to an embodiment, the interface2177may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.

A connecting terminal2178may include a connector via which the electronic device2101may be physically connected with the external electronic device (e.g., the electronic device2102). According to an embodiment, the connecting terminal2178may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector).

The camera module2180may capture a still image or moving images. According to an embodiment, the camera module2180may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module2188may manage power supplied to the electronic device2101. According to one embodiment, the power management module2188may be implemented as at least part of, for example, a power management integrated circuit (PMIC).

The battery2189may supply power to at least one component of the electronic device2101. According to an embodiment, the battery2189may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell.

The communication module2190may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device2101and the external electronic device (e.g., the electronic device2102, the electronic device2104, or the server2108) and performing communication via the established communication channel. The communication module2190may include one or more communication processors that are operable independently from the processor2120(e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module2190may include a wireless communication module2192(e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module2194(e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network2198(e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network2199(e.g., a long-range communication network, such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module2192may identify and authenticate the electronic device2101in a communication network, such as the first network2198or the second network2199, using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module2196.

The antenna module2197may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device2101. According to an embodiment, the antenna module2197may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, the antenna module2197may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network2198or the second network2199, may be selected, for example, by the communication module2190(e.g., the wireless communication module2192) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module2190and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module2197.

According to an embodiment, commands or data may be transmitted or received between the electronic device2101and the external electronic device2104via the server2108coupled with the second network2199. Each of the electronic devices2102or2104may be a device of a same type as, or a different type, from the electronic device2101. According to an embodiment, all or some of operations to be executed at the electronic device2101may be executed at one or more of the external electronic devices2102,2104, or2108. For example, if the electronic device2101should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device2101, instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device2101. The electronic device2101may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device2101may provide ultra low-latency services using, e.g., distributed computing or mobile edge computing. In another embodiment, the external electronic device2104may include an internet-of-things (IoT) device. The server2108may be an intelligent server using machine learning and/or a neural network. According to an embodiment, the external electronic device2104or the server2108may be included in the second network2199. The electronic device2101may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology or IoT-related technology.

According to various embodiments, the battery (e.g., the battery100inFIG.1A) may include: a positive electrode (e.g., the positive electrode112inFIG.1A) including a positive electrode substrate (e.g., the positive electrode substrate420inFIG.4B), a positive active material (e.g., the second positive active material413inFIG.4B) applied to one surface of the positive electrode substrate420, and a positive electrode tab (e.g., the positive electrode tab415) attached to the one surface of the positive electrode substrate420; a negative electrode (e.g., the negative electrode114inFIG.1A) including a negative electrode substrate (e.g., the negative electrode substrate420inFIG.4B), a negative active material (e.g., the first negative active material421inFIG.4B) applied to one surface of the negative electrode substrate420(e.g., the first negative active material421inFIG.4B), and a negative electrode tab (e.g., the negative electrode tab425inFIG.4A) attached to the one surface of the negative electrode substrate420; and a separator (e.g., the separator430ofFIG.4B) located between the positive electrode112and the negative electrode114. In the one surface of the negative electrode substrate420, a first region (e.g., the negative uncoated region429binFIG.4B) facing the positive electrode tab415may include a region to which the negative active material421is not applied, and in the one surface of the negative electrode substrate420, a second region (e.g., the second region312binFIG.3) adjacent to the first region429bin the longitudinal direction of the positive electrode tab415may include a region to which the negative active material421is applied. The negative electrode114may include an insulating layer (e.g., the insulating layer440inFIG.4A) disposed in at least a portion of the first region429b.

According to various embodiments, the insulating layer440may include a first insulating layer (e.g., the first insulating layer441inFIG.4B) disposed from the first region429bto a peripheral region of the second region312bwithin a predetermined range from the first region429b.

According to various embodiments, the insulating layer440may include a second insulating layer (e.g., the second insulating layer442inFIG.4D) disposed in the first region429b.

According to various embodiments, the insulating layer440may include a third insulating layer (e.g., the third insulating layer443inFIG.4E) disposed up to a peripheral region of the second region312bwithin a predetermined range from the first region429to cover the first region429bin which the second insulating layer442is disposed.429b.

According to various embodiments, the insulating layer440may be made of an insulative material.

According to various embodiments, the insulating layer440may have a thickness corresponding to the thickness of the negative active material (e.g., the first negative active material421inFIGS.4B to4E) surrounding the first region429b.

According to various embodiments, an end of the positive electrode substrate410in one direction and an end of the negative electrode substrate420in one direction may be non-overlappedly arranged.

According to various embodiments, the battery100may include a plurality of turn regions including a first turn region (e.g., the first turn region T1inFIG.4A) and a second turn region (e.g., the second turn region T2inFIG.4A) in which the positive electrode substrate410, the separator430, and the negative electrode substrate420are wound in a jelly-roll type.

According to various embodiments, the negative electrode substrate420may be provided with the first region429to which the negative active material421is not applied in another turn region adjacent to a turn region in which the positive electrode tab415is disposed among the plurality of turn regions.

According to various embodiments, in a surface opposite to the one surface of the negative electrode substrate420, the negative active material421may not applied to a region corresponding to the first region429b.

According to various embodiments, wherein, in the one surface of the positive electrode substrate410, a third region (e.g., the positive uncoated region419binFIG.4D) facing the negative tab425may include a region to which the positive active material413is not applied, in the one surface of the negative electrode substrate410, a fourth region (e.g., the fourth region1727inFIG.17) adjacent to the third region419bin the longitudinal direction of the negative electrode tab425may include a region to which the positive active material413is applied, and the positive electrode112may include an insulating layer440disposed in at least a portion of the third region419b.

According to various embodiments, the positive electrode substrate410may be provided with the third region419bto which the positive active material413is not applied in another turn region adjacent to a turn region in which the negative electrode tab425is disposed among the plurality of turn regions.

According to various embodiments, an electronic device (e.g., the electronic device2101inFIG.21) may include: a memory (e.g., the memory2130ofFIG.21); a processor (e.g., processor2120ofFIG.21); and a battery100configured to supply power to the memory2130and the processor2120. The battery100may include: a positive electrode112including a positive electrode substrate410, a positive active material413applied to one surface of the positive electrode substrate410, and a positive electrode tab415attached to the one surface of the positive electrode substrate410; a negative electrode114including a negative electrode substrate420, a negative active material421applied to one surface of the negative electrode substrate420, and a negative electrode tab425attached to the one surface of the negative electrode substrate420; and a separator430located between the positive electrode112and the negative electrode114. In the one surface of the negative electrode substrate420, a first region429bfacing the positive electrode tab415may include a region to which the negative active material421is not applied, and in the one surface of the negative electrode substrate420, a second region312badjacent to the first region429bin the longitudinal direction of the positive electrode tab415may include a region to which the negative active material421is applied. The negative electrode114includes an insulating layer440disposed in at least a portion of the first region429b.

According to various embodiments, the insulating layer440may include a first insulating layer441disposed from the first region429bup to a peripheral region of the second region312bwithin a predetermined range from the first region429b.

According to various embodiments, the insulating layer440may include a second insulating layer442disposed in the first region429b.

According to various embodiments, the insulating layer440may include a third insulating layer443disposed up to the peripheral region of the second region312bwithin the predetermined range from the first region429bto cover the first region429bin which the second insulating layer442is disposed.

According to various embodiments, the insulating layer440may be made of an insulative material.

According to various embodiments, the insulating layer440may have a thickness corresponding to the thickness of the negative active material421surrounding the first region429b.

According to various embodiments, in the one surface of the positive electrode substrate410, a third region419bfacing the negative electrode tab425may include a region to which the positive active material413is not applied, in the one surface of the positive electrode substrate410, a fourth region1727adjacent to the third region419bin the longitudinal direction of the negative electrode tab425may include a region to which the positive active material413is applied, and the positive electrode tab112may include an insulating layer440disposed in at least a portion of the third region419b.

According to various embodiments, the positive electrode substrate410may be provided with the third region419bto which the positive active material413is not applied in another turn region adjacent to a turn region in which the negative electrode tab425is disposed among the plurality of turn regions.