BATTERY AND ELECTRONIC DEVICE

A battery including an electrode plate assembly, where the electrode plate assembly includes an electrode plate and a first tab. The electrode plate includes a current collector, where the current collector includes a first conductive material layer, an insulating material layer, and a second conductive material layer that are stacked. The current collector includes a main body part and a folded part; the first conductive material layer includes a first main body region and a first folded region; the second conductive material layer includes a second main body region and a second folded region; and along a thickness direction of the main body part, at least a part of the second folded region and the first main body region are located on a first side of the main body part. The first tab is electrically connected to both the first main body region and the second folded region.

TECHNICAL FIELD

Some embodiments of this application relate to the field of battery technologies, and in particular, to a battery and an electronic device.

BACKGROUND

A battery is an apparatus that converts external energy into electric energy and that stores the electric energy in the battery, to supply power to an external device (for example, a portable electronic device) as needed. Currently, batteries are widely used in electronic devices such as mobile phones, tablets, and notebook computers.

The electrode plate of a battery includes a current collector and an active material layer provided on the current collector. At present, electrode plates of some batteries in the market use composite current collectors. Specifically, the composite current collector includes an insulating material layer located in the middle and conductive material layers arranged on two sides of the insulating material layer; and the tab of the battery is arranged on one conductive material layer.

During the implementation of this application, the applicant has found that due to the arrangement of the foregoing insulating material layer between the two conductive material layers, it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

SUMMARY

Some embodiments of this application are intended to provide a battery and an electronic device, so as to alleviate the current situation that it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

The following technical solution is used in some embodiments of this application to solve the technical problem. The solution is specifically described below.

A battery is provided, including an electrode plate assembly, where the electrode plate assembly includes an electrode plate and a first tab. The electrode plate includes a current collector, where the current collector includes a first conductive material layer, an insulating material layer, and a second conductive material layer that are stacked. The current collector is partially folded so that the current collector has a main body part and a folded part; the first conductive material layer includes a first main body region located in the main body part and a first folded region located in the folded part; the second conductive material layer includes a second main body region located in the main body part and a second folded region located in the folded part; and along a thickness direction of the main body part, at least a part of the second folded region and the first main body region are located on a first side of the main body part. The first tab is electrically connected to both the first main body region and the second folded region.

In the battery provided in these embodiments of this application, the first main body region of the first conductive material layer and the second folded region of the second conductive material layer are both connected to the first tab. That is, the battery provided in these embodiments of this application can alleviate the current situation that it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

In some embodiments, the main body part has a first notch, where the first notch is formed by folding the folded part relative to the main body part. The folded part is disposed at a location of the first notch before formed, and the folded part is formed by being partially cut off from the main body part and then folded.

In some embodiments, a contour of an outer edge of the current collector includes two long sides respectively arranged at two ends of the current collector along a first direction and two short sides respectively arranged at two ends of the current collector along a second direction, the first direction intersecting with the second direction. An intersection line between the first main body region and the first folded region is a first intersection line, and an included angle between the first intersection line and an extension direction of the short sides is less than 5°. Thus, the folded part is generally folded along an extension direction of the long side of the current collector.

In some embodiments, the first notch is spaced apart from both of the two short sides.

In some embodiments, the first notch extends to one of the short sides; and/or the first notch extends to one of the long sides. In this way, the first notch in the electrode plate in this embodiment extends through one of the foregoing long sides and/or short sides, so that the processing of at least one slot during manufacturing of the electrode plate can be eliminated, thereby improving the production efficiency of the electrode plate and the battery.

In some embodiments, a contour of an outer edge of the current collector includes two long sides respectively arranged at two ends of the current collector along a first direction and two short sides respectively arranged at two ends of the current collector along a second direction, the first direction intersecting with the second direction. An intersection line between the first main body region and the first folded region is a first intersection line, and an included angle between the first intersection line and the long sides is less than 5°. Thus, the folded part is generally folded along an extension direction of the short side of the current collector.

In some embodiments, the first notch is spaced apart from both of the two long sides of the current collector.

In some embodiments, the first notch extends to one of the long sides; and/or the first notch extends to one of the short sides. In this way, the first notch in the electrode plate in this embodiment extends through one of the foregoing long sides and/or short sides, so that the processing of at least one slot during manufacturing of the electrode plate can be eliminated, thereby improving the production efficiency of the electrode plate and the battery.

In some embodiments, the current collector includes two folded parts, and the first tab is electrically connected to both the two folded parts. The arrangement of two folded parts is conducive to increasing a contact area between the second conductive material layer and the first tab. In addition, an increase in the number of folded parts is also conducive to improving the reliability of contact between the second conductive material layer and the first tab.

In some embodiments, the two folded parts connected to the same tab are folded in opposite directions relative to the main body region.

In some embodiments, the first notches corresponding to the two first folded regions are communicated into one notch. If the two first notches are not communicated with each other, the formation of each folded part requires the arrangement of at least two slots on the current collector, meaning a total of at least four slots need to be cut on the current collector to implement the provision of two folded parts. In this embodiment, through the cutting of at least two slots on the current collector, the provision of two folded parts can be implemented. Therefore, the arrangement of mutual communication between the two first notches is conducive to improving the production efficiency of the electrode plate.

In some embodiments, a contour of an outer edge of the main body part includes two long sides respectively arranged at two ends of the main body part along a first direction and two short sides respectively arranged at two ends of the main body part along a second direction, the first direction intersecting with the second direction. The folded part is connected to the long side or the short side and is stacked on the main body part. The folded part originally lies outside the main body part. Therefore, compared to the foregoing embodiments, no slot cutting is required during the formation of the folded part in the electrode plate, making the folding more convenient to some extent.

In some embodiments, the main body part includes a base part and a connecting part. A contour of an outer edge of the base part includes two long sides respectively arranged at two ends of the base part along a first direction and two short sides respectively arranged at two ends of the base part along a second direction, the first direction intersecting with the second direction. The connecting part is formed by extending outward from an edge of the base part. The folded part is connected to an edge of the connecting part and at least partially stacked on the connecting part and/or the main body part. The folded part originally lies outside the main body part. Therefore, compared to the foregoing embodiments, no slot cutting is required during the formation of the folded part in the electrode plate, making the folding more convenient to some extent.

In some embodiments, the current collector is partially folded so that the current collector has the main body part, the folded part, and a bent part. The first conductive material layer includes the first main body region, the first folded region, and a first bent region located in the bent part; and the second conductive material layer includes the second main body region, the second folded region, and a second bent region located in the bent part. Along a thickness direction of the current collector, at least a part of the first bent region and the second main body region are located at a second side of the current collector, where the first side and the second side are two opposite sides of the current collector along the thickness direction. The battery further includes a second tab, where the second tab is electrically connected to both the second main body region and the first bent region, and the first tab is electrically connected to the second tab. The first tab is arranged to be electrically connected to both the first conductive material layer and the second conductive material layer. The second tab is arranged to aim to further reduce an internal resistance of the electrode plate. In this embodiment, the first tab and the second tab are staggered along an extension direction of the foregoing long side, which is conducive to reducing the overall thickness of the electrode plate assembly. In other embodiments of this application, the first tab and the second tab may alternatively be located on a same side of the main body part, equivalent to provision of two first tabs. However, compared with this, under the condition that shapes and structures of the folded part and the bent part are basically the same, the provision on different sides is conducive to ensuring that a total area by which the first conductive material layer is connected to the two tabs is close to, or even the same as, a total area by which the second conductive material layer is connected to the two tabs.

In some embodiments, the electrode plate further includes an active material layer. A surface of the first conductive material layer has a first coating region provided with the active material layer and a first blank region not provided with the active material layer, and the folded part, the notch, and the first tab are arranged in the first blank region. A surface of the second conductive material layer has a second coating region provided with the active material layer and a second blank region not provided with the active material layer, and an end of the notch is communicated with the second blank region.

In some embodiments, the battery includes two electrode plate assemblies and a separator, where the separator is arranged between the two electrode plate assemblies. In the two electrode plate assemblies, the electrode plate in one electrode plate assembly constitutes the positive electrode plate of the battery, while the electrode plate in the other electrode plate assembly constitutes the negative electrode plate of the battery. The separator is arranged between the two electrode plate assemblies to separate the two electrode plate assemblies.

The following technical solution is further used in some embodiments of this application to solve the technical problem. The solution is specifically described below.

An electronic device is provided, including the battery according to any of the foregoing embodiments.

REFERENCE SIGNS

DETAILED DESCRIPTION

For ease of understanding of this application, the following describes this application in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being “fixed to”, “fastened to”, or “mounted to” another element, it may be directly fixed to the another element, or there may be one or more elements therebetween. When an element is referred to as being “connected to” another element, it may be directly connected to the another element, or there may be one or more elements therebetween. The terms “perpendicular”, “horizontal”, “left”, “right”, “inside”, “outside”, and similar expressions used herein are merely for description purposes.

Unless otherwise defined, all technical and scientific terms used herein shall have the same meanings as commonly understood by persons skilled in the art to which this application belongs. The terms used in the specification of this application are merely intended to describe specific embodiments rather than to limit this application. The term “and/or” used herein includes any and all combinations of one or more associated items listed.

In addition, technical features involved in different embodiments of this application that are described below may be combined as long as they do not conflict with each other.

In this specification, “mounting” includes fixing or limiting an element or apparatus to a specific position or place by welding, screwing, clamping, bonding, or the like. The element or apparatus may stay still at the specific position or place, or may move within a limited range. After being fixed or limited to the specific position or place, the element or apparatus can be disassembled or cannot be disassembled. This is not limited in some embodiments of this application.

This application provides an electrode plate assembly1, referring toFIGS.1to3, which respectively show the front view, top view, and locally enlarged schematic view at position A of the electrode plate assembly1according to an embodiment of this application. The electrode plate assembly1includes an electrode plate100and a first tab200. The electrode plate100includes a current collector110, where the current collector110includes a first conductive material layer112, an insulating material layer111, and a second conductive material layer113that are stacked, and the insulating material layer111is located between the first conductive material layer112and the second conductive material layer113. The current collector110is partially folded so that the current collector110has a main body part114and a folded part115; correspondingly, the first conductive material layer112includes a first main body region1121located in the main body part114and a first folded region1122located in the folded part115; and the second conductive material layer113includes a second main body region1131located in the main body part114and a second folded region1132located in the folded part115. Along a thickness direction Z of the main body part114, at least a part of the second folded region1132and the first main body region1121are located on a first side M of the main body part114; and the first tab200is electrically connected to both the first main body region1121and the second folded region1132.

To better understand the specific structure of the electrode plate assembly1, the electrode plate100and the first tab200are described in turn in the following.

For the foregoing electrode plate100, specifically refer toFIG.4, which shows a front view of the electrode plate100. In addition, with reference toFIGS.1to3, the electrode plate100includes a current collector110and an active material layer120. The current collector110has a long sheet-like structure. A contour of its outer edge includes two long sides1101respectively arranged at its two ends along a first direction X, and two short sides1102respectively arranged at its two ends along a second direction Y; where the first direction X intersects with the second direction Y. The long side1101is the long side of the current collector110in a flattened state, and an extension direction of the long side1101is an extension direction of the current collector110. When the current collector110is flattened, it extends straight; and when the current collector110is wound, it extends curvedly. The short side1102is the short side of the current collector110in a flattened state, and an extension direction of the short side1102is a width direction of the current collector110when it is flattened. In this embodiment, the long side1101is perpendicular to the short side1102, meaning that the first direction X is perpendicular to the second direction Y. However, in other embodiments, the included angle between the long side1101and the short side1102may also be set to other values. It is worth noting that thickness of the current collector110is very small compared with thickness of the active material layer120. The thickness of the current collector110is generally less than 200 micrometers (μm), and most current collectors on the current market do not exceed 100 μm in thickness. InFIG.2, to better illustrate the structure of the current collector110, its dimension in a thickness direction is exaggerated. However, it should be understood that the thickness proportion relationship between the current collector110and the active material layer120depicted in the figure does not impose limitations on the thickness proportion relationships between actual electrode plate products.

For the foregoing current collector110, refer toFIGS.1to4. In this embodiment, the current collector110is a composite current collector. Specifically, it includes a first conductive material layer112, an insulating material layer111, and a second conductive material layer113that are stacked sequentially in the thickness direction. The insulating material layer111is made of an insulating material and serves as a substrate for the first conductive material layer112and the second conductive material layer113. It also physically separates the first conductive material layer112from the second conductive material layer113. Optionally, the insulating material layer111includes a polymer material; and further optionally, the insulating material layer111includes at least one of polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyvinyl nylon, chloride, polycarbonate, polyurethane, polytetrafluoroethylene, polyethylene terephthalate, epoxy resin, phenolic plastic, polyimide, or melamine formaldehyde resin. The first conductive material layer112and the second conductive material layer113are made of conductive materials and are respectively placed on two sides of the insulating material layer111. The specific material of the first conductive material layer112and the second conductive material layer113are not limited in this application. For example, in this embodiment, the electrode plate100is an anode plate, and the first conductive material layer112and/or the second conductive material layer113may be made of copper. It can be understood that in other embodiments of this application, the first conductive material layer112and/or the second conductive material layer113may alternatively be made of other suitable conductive materials such as copper alloys, nickel, or nickel alloys, which are not described in detail herein. Furthermore, in other embodiments of this application, the electrode plate100may alternatively be a cathode plate. In this case, the first conductive material layer112and/or the second conductive material layer113may be made of suitable conductive materials such as aluminum or aluminum alloys, which are not described in detail herein. As for the method of arranging the first conductive material layer112and the second conductive material layer113on the insulating material layer111, it may be electroplating, spraying, or adhesive bonding, which is not limited in this application.

A part of the current collector110is folded relative to other parts, such that the current collector110has a main body part114and a folded part115which are interconnected. In this embodiment, the main body part114is overall strip-shaped and is the main body of the current collector110. The main body part114has a first side M and a second side N oppositely arranged in its thickness direction Z, where the first side M is a side of the main body part114provided with the first conductive material layer112, and the second side N is a side of the main body part114provided with the second conductive material layer113. The folded part115is located on the first side M of the main body part114and is arranged opposite the main body part114. It is a part of the current collector110that is folded relative to the main body part114to be at least partially arranged on the first side M of the main body part114. As a result, the foregoing first conductive material layer112includes two parts due to the partial folding arrangement of the current collector110, specifically, the first main body region1121located in the main body part114and the first folded region1122located in the folded part115. Similarly, the second conductive material layer113includes the second main body region1131located in the main body part114and the second folded region1132located in the folded part115.

In this embodiment, the main body part114has a first notch1103, where the first notch1103is formed by folding the folded part115relative to the main body part114; specifically, before formed, the folded part115is disposed at a location of the first notch1103, and it is formed by being partially cut off from the main body part114and then folded. More specifically, along the extension direction of the long side1101, the first notch1103is located between the two short sides1102, that is, the first notch1103is spaced apart from both of the two short sides1102; along the extension direction of the foregoing short sides1102, two ends of the first notch1103are located between the two long sides1101, that is, the first notch1103is spaced apart from both of the two long sides1101. This makes the edge contour of the first notch1103on the surface of the first conductive material layer112closed, such as the rectangle shown inFIG.4.

The folded part115is folded relative to the main body part114, so that the first notch1103is formed on the main body part114, and in addition, a first intersection line L1is formed between the first main body region1121and the first folded region1122. In this embodiment, the first intersection line L1is approximately parallel to the extension direction of the short side1102, and an included angle between the first intersection line L1and the extension direction of the short side1102is less than 5°, meaning that the folded part115and the short side1102are arranged as parallel or approximately parallel to each other. It should be noted that absolute parallelism or perpendicularity between two components (or parts) in a physical object generally does not exist, because as long as the measuring instrument has sufficient accuracy, the result of measuring the included angle between the two components always deviates from being perfectly parallel or perpendicular. Therefore, the term “approximately parallel” as used in this application document means that the two components (or parts) are arranged to be close to parallel, for example, the included angle between the two components (or parts) is less than 5°; likewise, the term “approximately perpendicular” as used in this application document means that the included angle between the two components (or parts) is greater than 85° and less than 95°. Furthermore, a folded edge is formed on the outer surface at the junction after the folded part115is folded relative to the main body part114, and the folded edge is parallel to the first intersection line L1. Therefore, the measurement of the foregoing included angle may be indirectly conducted through the folded edge.

Next, a brief explanation of a forming process of the current collector110will be provided. Referring toFIG.5, which shows a schematic diagram of the current collector110in a state before folding, in conjunction with other figures, the specific steps are described as follows:

S110: Form a current collector110with an overall rectangular shape. For example, in some embodiments, the insulating material layer is first formed. Then, using this insulating material layer111as a substrate, metal material is sprayed or electroplated on two sides of the insulating material layer111to form the first conductive material layer112and the second conductive material layer113.

S120: Form a through slot1104as shown inFIG.5on the current collector110. For example, in some embodiments, the through slot1104is cut by laser cutting, and the through slot1104includes a first slot11041, a second slot11042, and a third slot11043. The first slot11041and the third slot11043are arranged opposite each other, and both are approximately parallel to the foregoing long side1101. The second slot11042communicates with the first slot11041and the third slot11043. Thus, a sheet-like structure is formed by the first slot11041, the third slot11043, and the second slot11042shown inFIG.5, which can be folded relative to the main body part114. It can be understood that in other embodiments, the through slot1104can alternatively be formed in other ways, which is not limited in this application.

S130: Fold the sheet-like structure in a direction leaving the third slot11043and make it located on the first side M of the main body part114. Specifically, the sheet-like structure shown inFIG.5is folded to the right and made to be located on the first side of the main body part114, thus obtaining the folded part115as shown inFIG.4. In addition, after the folded part115is folded, the first notch1103of basically a same size is formed on the main body part114, which together with the through slot1104forms a complete rectangular notch structure.

For the foregoing active material layer120, refer toFIG.2in combination with other accompanying drawings for details. The active material layer120is arranged on the surface of the current collector110and is a material layer for intercalation and deintercalation of lithium ions. Specifically, a surface of the first conductive material layer112has a first coating region11201and a first blank region11202; where the first coating region11201is coated with the active material layer120, and the first blank region11202is an exposed region not provided with the active material layer120. That is to say, the surface of the first conductive material layer112has the first coating region11201provided with the active material layer120and the first blank region11202not provided with the active material layer120. Similarly, the surface of the second conductive material layer113also has a second coating region11301provided with the active material layer120and a second blank region11302not provided with the active material layer120. The foregoing first blank region11202is arranged opposite the second blank region11302; the folded part115and the first notch1103are both disposed at the first blank region11202, and one end of the first notch1103away from the first blank region11202runs through the second blank region11302.

For the foregoing first tab200, refer toFIG.2in conjunction with other accompanying drawings for details. The first tab200is mounted on the current collector110, and is electrically connected to both the first main body region1121and the second folded region1132, thereby allowing both the first conductive material layer112and the second conductive material layer113to be electrically connected to the first tab200. Specifically, the first tab200has a flat strip-like structure; one end of the first tab200is fixed to the first blank region11202, covering at least a portion of the foregoing folded parts115, thereby achieving simultaneous electrical connection to the first main body region1121and the second folded region1132; and another end of the first tab200extends out of the current collector110, which is conducive to the formation of a conductive terminal of a battery for external connection to an electric apparatus when the electrode plate assembly1is applied to the battery. As for the method of fixing the first tab200to the first main body region1121, various options are available, which are not specifically limited in this application. For example, the first tab200may be fixed to the first main body region1121by welding, conductive adhesive bonding, riveting, or other methods, which are not described in detail herein.

It should be understood that even in this embodiment, the current collector110includes a folded part115and the contour of the corresponding first notch1103on the surface of the first conductive material layer112is closed, that is, the first notch1103is spaced apart from both of the two long sides1101along the first direction X, and the first notch1103is spaced apart from both of the two short sides along the second direction Y, but this application is not limited to this.

For example,FIG.6is a schematic diagram of the electrode plate100bprovided in a second embodiment of this application. The current collector110bof the electrode plate100balso includes a main body part114band a folded part115b, and the first notch1103bformed corresponding to the folded part115bis still spaced apart from both of the two short sides1102along the second direction Y. The main difference between this electrode plate100band the electrode plate100in the foregoing embodiments is that the contour of the first notch1103in the electrode plate100on the surface of the first conductive material layer112is closed; while the contour of the first notch1103bin this electrode plate100bon the surface of the first conductive material layer112is non-closed. Specifically, along the first direction X, one end of the first notch1103bin the electrode plate100bis located between the two long sides1101b, while the other end extends to one long side1101b; that is, one end of the first notch1103btraverses one long side1101b.

Compared with the electrode plate100in the foregoing embodiments, because one end of the first notch1103btraverses one long side1101b, the electrode plate100bin this embodiment allows for avoiding the processing of the third slot during manufacturing of the electrode plate100b. This can enhance the production efficiency of the electrode plate100band the battery.

For another example,FIG.7is a schematic diagram of the electrode plate100cprovided in a third embodiment of this application, and with reference toFIGS.1to6, the current collector110cof the electrode plate100cstill includes a main body part114cand a folded part115c, which is different from the electrode plate100bin the second embodiment mainly in that: in the second direction Y, both of the two ends of the first notch1103bin the electrode plate100bare spaced apart from the two short sides1102b; while in the electrode plate100c, one end of the first notch1103cis located between the two short sides1102cand is spaced apart from both of the two short sides1102c, and the other end of the first notch1103cextends to one short side1102c, so that one end of the first notch1103cin the second direction Y traverses one short side1102c.

Compared with the electrode plate100bin the second embodiment, the electrode plate100cin this embodiment not only traverses one long side1101cat one end along the first direction X, but also traverses one short side1102cat one end along the second direction Y. Therefore, the electrode plate100ccan avoid the processing of the second slot during manufacturing, thereby improving the production efficiency of the electrode plate100cand the battery. Of course, other embodiments of this application can also make adaptive modifications based on this embodiment. For example, in some embodiments, along the second direction Y, one end of the first notch1103cstill traverses one short side1102c, but along the first direction X, both ends of the first notch1103care spaced apart from the two long sides1101c.

For another example,FIG.8is a schematic diagram of the electrode plate100dprovided in a fourth embodiment of this application. The current collector110dof the electrode plate100dstill includes a main body part114dand a folded part115d. This electrode plate100dis different from the electrode plate100bin the foregoing second embodiment mainly in that the current collector110bof the electrode plate100bin the second embodiment includes a main body part114band one folded part115d; while the current collector110dof this electrode plate100dincludes a main body part114dand two folded parts115d. Specifically, the two folded parts115are staggered along the second direction Y, and the first intersection lines L1formed by the two folded parts115dare approximately parallel to each other. The two folded parts115dare both connected to the foregoing first tab200. Optionally, the two folded parts115dare folded in opposite directions relative to the main body part114d. Further optionally, each folded part115dis folded in a direction leaving the other folded part115d; for example, as shown inFIG.8, the folded part115on the left of the figure is folded to the left relative to the main body part114, while the folded part115on the right of the figure is folded to the right relative to the main body part114. Further optionally, the first notches1103dcorresponding to the two folded parts115dare communicated, thereby forming a single notch.

Refer toFIG.9, which is a schematic diagram of the electrode plate100din a state before formed. Next, a formation process of the electrode plate100dwill be briefly explained in conjunction withFIG.9and other accompanying drawings.

First, a current collector110dwith an overall rectangular shape is formed. For example, in some embodiments, the insulating material layer is first formed. Then, using this insulating material layer as a substrate, metal material is electroplated or sprayed on two sides of the insulating material layer to form the first conductive material layer and the second conductive material layer. Then, a T-shaped through slot1104das shown inFIG.9is formed on the current collector110d. The through slot1104dincludes a first slot11041dapproximately parallel to the long side1101d, and a second slot11042dextending from the middle of the first slot11041dto traverse one long side1101d. Thus, a sheet-like structure is formed on the right of the second slot11042dand above the first slot11041d, as shown inFIG.5, which can be folded relative to the main body part114d, and another sheet-like structure is formed on the left of the second slot11042dand above the first slot11041d, which can be folded relative to the main body part114d. In some embodiments, the foregoing T-shaped through slot may be formed by laser cutting. Of course, in other embodiments, the T-shaped through slot may be formed by other methods, which is not limited in this application. Next, each sheet-like structure on both sides of the second slot11042is folded away from the other sheet-like structure and is made to be located on the first side of the main body part114d. Specifically, the sheet-like structure on the left as shown inFIG.9is folded to the short side on the left and is made to be located on the first side of the main body part114d. Thus, a folded part115don the left as shown inFIG.8is obtained. Then, the sheet-like structure on the right as shown inFIG.9is folded to the right and is made to be located on the first side M of the main body part114d. Thus, a folded part115don the right as shown inFIG.8is obtained. In this case, the two first notches1103dare communicated to form a single notch.

Compared with the electrode plates provided in the first to third embodiments, the arrangement of two folded parts115dis conducive to increasing a contact area between the second conductive material layer and the first tab200. In addition, an increase in the number of folded parts115dis also conducive to improving the reliability of contact between the second conductive material layer and the first tab200. In addition, the arrangement that two first notches1103dcommunicate with each other to form a single notch is conducive to improving the production efficiency of the electrode plate100. Specifically, if the two first notches1103ddo not communicate with each other, the formation of each folded part115drequires the arrangement of two slots on the current collector110d, meaning a total of four slots need to be cut on the current collector110dto implement the provision of two folded parts115d. In this embodiment, through the cutting of two slots (the first slot11041dand the second slot11042d) on the current collector110d, the provision of two folded parts115dcan be implemented. Therefore, the arrangement of mutual communication between the two first notches1103is conducive to improving the production efficiency of the electrode plate100.

It can be understood that although the first intersection lines L1corresponding to the two folded parts115dof the current collector110in the fourth embodiment are arranged as approximately parallel to each other, this application can still make adaptive modifications based on this. For example, in some other embodiments, the first intersection lines L1corresponding to the two folded parts115dare perpendicular to each other, meaning that the folding directions of the two folded parts115drelative to the main body part114are perpendicular to each other. Of course, in some other embodiments, the first intersection lines L1corresponding to the two folded parts115dmay be arranged at other included angles. Furthermore, in combination with the foregoing first to third embodiments, it can be understood that this application may make adaptive modifications based on the fourth embodiment. For example, the notch formed after the two first notches1103dare communicated can traverse one long side at one end as in the second and fourth embodiments, traverse one short side at one end as in the third embodiment, or present a closed contour on the surface of the first conductive material layer as in the first embodiment.

For another example,FIG.10is a schematic diagram of the electrode plate100eprovided in a fifth embodiment of this application. The current collector110eof the electrode plate100ealso includes a main body part114eand a folded part115e. This electrode plate100eis different from the electrode plates in the foregoing embodiments mainly in that in the electrode plate100e, the folding of the folded part115erelative to the main body part114edoes not form the foregoing first notch. Specifically, the current collector110eincludes a main body part114eand a folded part115e. A contour of the outer edge of the main body part114eincludes two long sides1101erespectively arranged at two ends of the main body part114ealong the first direction X and two short sides1102erespectively arranged at two ends of the main body part114ealong the second direction Y. In this embodiment, the main body part114eis rectangular in shape. The folded part115eis connected to the foregoing long side or short side; which is folded relative to the main body part114eto be stacked on the first side of the main body part114e. It is worth adding that the dashed lines inFIG.10indicate the position of the folded part115ebefore folding.

The folded part115eoriginally lies outside the main body part114e. Therefore, compared to the foregoing first to fourth embodiments, no slot cutting is required during the formation of the folded part115ein the electrode plate100e, making the folding more convenient to some extent.

For another example,FIG.11is a schematic diagram of the electrode plate100fprovided in a sixth embodiment of this application, andFIG.12is a top view ofFIG.11. The current collector110fof the electrode plate100falso includes a main body part114fand a folded part115f. With reference toFIGS.1to10, it can be seen that the main difference between the electrode plate100fand the electrode plates in the first to fourth embodiments is that in the electrode plate100f, the first notch is not formed when the folded part115fis folded relative to the main body part114f. Specifically, the current collector110falso includes a main body part114fand a folded part115f. The main body part114fincludes a base part1141fand a connecting part1142f. A contour of the outer edge of the base part1141fincludes two long sides1101frespectively arranged at two ends of the base part1141fin the first direction X and two short sides1102frespectively arranged at two ends of the base part1141fin the second direction Y. In this embodiment, the main body part114eis rectangular in shape. The connecting part1142fis connected to the long side1101for the short side1102fand is formed by extending outward from an edge of the base part1141f. The connecting part1142f, together with the base part1141f, forms a convex structure. The folded part115fis connected to an edge of the connecting part1142fand has a sheet-like structure. The folded part115fis folded relative to the main body part114fand is stacked on the first side of the main body part114e. For example, in this embodiment, at least a portion of the folded part115fis stacked on the base part1141fand the connecting part1142f. It can be understood that in other embodiments of this application, the folded part115fmay also be stacked on either the base part1141for the connecting part1142f.

It is worth adding that the “long lateral side”/“long side” mentioned in this application document refers to a side of its main body element (such as the foregoing main body part and base part) extending along the length direction, and located at the outermost of the main body element in the width direction. The “short lateral side”/“short side” mentioned in this application document refers to a side of its main body element (such as the foregoing main body part and base part) extending along the width direction and located at the outermost of the main body element in the length direction.

The folded part115foriginally lies outside the main body part114f. Therefore, compared with the foregoing first to fourth embodiments, no slot cutting is required during the formation of the folded part115fin the electrode plate100f, making the folding more convenient to some extent.

To sum up, in the electrode plate assembly1provided in these embodiments of this application, the first main body region1121of the first conductive material layer112and the second folded region1132of the second conductive material layer113are both electrically connected to the first tab200. That is, the electrode plate assembly1provided in these embodiments of this application can alleviate the current situation that it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

In addition, based on the first embodiment, this application further improves it and provides another electrode plate assembly1g. Refer toFIG.13, which is a front view of the electrode plate assembly1g. The electrode plate assembly1gstill includes an electrode plate100gand a first tab200g. The main difference between the electrode plate assembly1gand the electrode plates in the foregoing embodiments is that in the electrode plate assembly1g, in addition to a main body part114gand a folded part115g, the electrode plate100gfurther includes a bent part116g; and correspondingly, the electrode plate assembly1gfurther includes a second tab300g.

Specifically, the current collector110gis locally folded at least two positions, such that the current collector110ghas a main body part114g, a folded part115g, and a bent part116g. Here, the connection relationship between the main body part114gand the folded part115gis the same as that in the arrangement of the electrode plate100in the first embodiment, and will not be repeated herein. The bent part116gis folded relative to the main body part114g, and its shape is generally the same as that of the folded part115g. The difference is that the bent part116gis located on the second side N of the main body part114g; that is, along the thickness direction Z of the main body part114g, the bent part116gand the folded part115gare arranged on two sides of the main body part114g.

Refer toFIGS.14and15, which are respectively locally enlarged schematic views of positions B and C inFIG.13. The first conductive material layer112gincludes a first main body region1121glocated in the main body part114g, a first folded region1122glocated in the folded part115g, and a first bent region1123glocated in the bent part116g; and similarly, the second conductive material layer113gincludes a second main body region1131glocated in the main body part114g, a second folded region1132glocated in the folded part115g, and a second bent region1133glocated in the bent part116g. Along the thickness direction Z, the first main body region1121gand at least a portion of the second folded region1132gare located on the first side M, and the first tab200gis arranged on the first side M of the main body part114gand is electrically connected to both the first main body region1121gand the second folded region1132g. The second main body region1131gand at least a portion of the first bent region1123gare located at the second side N of the current collector110g, and the second tab300gis arranged on the second side N of the main body part114gand is electrically connected to both the second main body region1131gand the first bent region1123g. The first tab200gand the second tab300gare electrically connected. The first tab200gis arranged to be electrically connected to both the first conductive material layer112gand the second conductive material layer113g. The second tab300gis arranged aiming to further reduce internal resistance of the electrode plate100g. Preferably, the first tab200gand the second tab300gare staggered along an extension direction of the foregoing long side, which is conducive to reducing the overall thickness of the electrode plate assembly1g.

It can be understood that in other embodiments of this application, the first tab200gand the second tab300gmay alternatively be located on a same side of the main body part114g, equivalent to provision of two first tabs200g. However, compared with this, under the condition that shapes and structures of the folded part115gand the bent part116gare basically the same, the provision on different sides is conducive to ensuring that a total area by which the first conductive material layer112gis connected to the two tabs is close to, or even the same as, a total area by which the second conductive material layer113is connected to the two tabs, thereby ensuring better electron conduction effect.

It should be understood that although the bent part116gin this embodiment is combined with the electrode plate assembly1in the foregoing first embodiment, it can also be combined with the electrode plate assembly1in the foregoing second to fourth embodiments. The connection method is basically the same, and details are not repeated herein again.

Based on the same inventive concept, this application further provides a battery. Refer toFIG.16, which is a schematic diagram of the battery2. The battery2includes a housing21and an electrode plate assembly according to any one of the foregoing embodiments. In this embodiment, the battery2includes two foregoing electrode plate assemblies and a separator. Specifically, in the two electrode plate assemblies, the electrode plate in one electrode plate assembly constitutes the positive electrode plate of the battery2, while the electrode plate in the other electrode plate assembly constitutes the negative electrode plate of the battery2. The separator is arranged between the two electrode plate assemblies to separate the two electrode plate assemblies.

The battery2includes the foregoing electrode plate assembly, so it can also alleviate the current situation that it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

It can be understood that in other embodiments, the battery2may only include one of the foregoing electrode plate assemblies, one conventional electrode plate, and one conventional tab. Specifically, the electrode plate in the electrode plate assembly constitutes the positive electrode plate (or negative electrode plate) of the battery2, the first tab in the electrode plate assembly constitutes the positive tab (or negative tab) of the battery2, the conventional electrode plate constitutes the negative electrode plate (or positive electrode plate) of the battery2, and the conventional tab constitutes the negative tab (or positive tab) of the battery2.

Based on the same inventive concept, another embodiment of this application further provides an electronic device3. Specifically, referring toFIG.17, which is a schematic diagram of the electronic device3, and with reference toFIGS.1to16, the electronic device3includes the battery2according to any one of the foregoing embodiments. In this embodiment, the electronic device is a mobile phone. It can be understood that in other embodiments of this application, the electronic device may alternatively be any other electronic device such as a tablet, a computer, a drone, a remote controller, or an electric car.

The electronic device3includes the foregoing electrode plate assembly, so it can also alleviate the current situation that it is difficult for electrons of the conductive material layer on the side facing away from the tab to flow to the tab.

Finally, it should be noted that the foregoing embodiments are merely intended to describe the technical solutions of this application, and are not intended to limit this application. Under the idea of this application, the foregoing embodiments or the technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of this application as described above, which, for the sake of brevity, are not provided in detail. Although this application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some technical features therein, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of some embodiments of this application.