Patent Description:
With the new energy vehicle market booming continuously, the power battery industry is growing and expanding rapidly. With the lithium battery technology becoming more sophisticated and advanced, higher requirements have been put forward on safety performance, energy density, and ease of industrialization of battery cells.

During assembling of a battery cell, an electrolytic solution needs to be injected into the battery cell to infiltrate an electrode assembly. However, currently, the electrolyte injection efficiency of the battery cell is low, and the infiltration effect of the electrode assembly is inferior, resulting in a low capacitance and low safety performance of the battery cell.

<CIT> discloses a battery cell comprising two current collection components situated at the top and bottom of a battery cell, wherein each of the current collection components comprises a center portion and a plurality of holes which allow for a distribution of the electrolytic solution after it is injected through the injection port. Further prior art comprises <CIT>, <CIT>, <CIT>, and <CIT>.

In view of the situation above, this application discloses a battery cell and a method and equipment for manufacturing same, a battery, and an electrical device, in which an electrolytic solution can infiltrate an electrode assembly more quickly and sufficiently, thereby not only improving the electrolyte injection efficiency of the battery cell, but also improving the capacitance and safety performance of the battery cell.

A first aspect of this application discloses a battery cell, including: a shell, including a first wall; an electrode terminal, dielectrically mounted on the first wall; an electrode assembly, accommodated in the shell, where the electrode assembly includes a center hole, and a first tab is formed on the electrode assembly at an end oriented toward the first wall; and a current collection component, disposed between the first wall and the electrode assembly. The current collection component includes a center portion and a periphery portion. The center portion positionally corresponds to the center hole. The center portion is configured to be connected to the electrode terminal. The periphery portion is configured to be connected to the first tab. A guide channel is disposed on the current collection component. The guide channel is configured to guide an electrolytic solution in the center hole to diffuse from the center portion to the periphery portion.

During injection of the electrolytic solution into the battery cell, the electrolytic solution enters the center hole. The guide channel guides the electrolytic solution in the center hole to diffuse from the center portion to the periphery portion, so as to quickly and sufficiently infiltrate the electrode assembly, thereby not only improving the electrolyte injection efficiency of the battery cell, but also improving the capacitance and safety performance of the battery cell.

According to the present invention, the guide channel is a first through-hole, and the first through-hole is located at an edge of the center portion.

In the above technical solution, the first through-hole is located at the edge of the center portion. Through the first through-hole, the electrolytic solution flows from one side to another side of the current collection component, the one side being close to the electrode assembly, and the other side being close to the first wall. In this way, the electrolytic solution is diffused to the periphery portion to infiltrate the electrode assembly quickly and sufficiently.

According to some embodiments of this application, the center portion protrudes beyond the periphery portion toward the electrode terminal. The current collection component further includes a transition portion. The transition portion encloses the center portion. The transition portion connects the center portion and the periphery portion. The first through-hole is disposed in the transition portion.

In the above technical solution, the center portion protrudes beyond the periphery portion toward the electrode terminal, and combines with the transition portion to form an electrolyte storage space that communicates with the center hole. The first through-hole is made in the transition portion. Therefore, after entering the electrolyte storage space from the center hole, the electrolytic solution flows along a perforation direction of the first through-hole to a side of the current collection component, the side being close to the first wall. The electrolytic solution continues to diffuse to the periphery portion along the perforation direction of the first through-hole, thereby infiltrating the electrode assembly quickly and sufficiently.

According to some embodiments of this application, the first through-hole is plural in number. The plurality of first through-holes are disposed around the center portion at intervals.

In the above technical solution, the plurality of first through-holes are arranged around the center portion at intervals, thereby guiding the electrolytic solution to diffuse to the periphery portion around the center portion circumferentially, and making the electrolytic solution infiltrate the electrode assembly quickly and sufficiently.

According to some embodiments of this application, along a circumference of the center portion, a total length of the plurality of first through-holes is greater than or equal to <NUM>/<NUM> of a perimeter of the transition portion.

In the above solution, the flow area of the transition portion is smaller than the flow area of the center portion and the periphery portion that are connected to the transition portion. Therefore, when an internal current of the battery cell is excessive, the current collection component is fused off in time, thereby electrically disconnecting the electrode terminal from the first tab in time, and achieving relatively high safety performance of the battery cell.

According to some embodiments of this application, the first through-hole is an arc-shaped hole that extends along a circumference of the center portion.

In the above technical solution, the first through-hole is an arc-shaped hole that extends along the circumference of the center portion, thereby not only increasing the opening area of the first through-hole and facilitating diffusion of the electrolytic solution, but also reducing a protruding height by which the center portion protrudes beyond the periphery portion, thinning the current collection component, making the battery cell structurally compact, and achieving a relatively high energy density.

According to the present invention, a second through-hole is made on the periphery portion. The second through-hole is farther away from the center portion than the first through-hole.

In the above technical solution, the second through-hole is made in the periphery portion, and can partly expose a clearance between two adjacent layers of electrode plate of the electrode assembly. Through the second through-hole, the electrolytic solution can enter the clearance between the two adjacent layers of electrode plate of the electrode assembly to infiltrate the electrode assembly quickly and sufficiently.

According to some embodiments of this application, the second through-hole is plural in number. The plurality of second through-holes are disposed around the center portion at intervals.

In the above technical solution, the plurality of second through-holes are arranged around the center portion at intervals, thereby guiding the electrolytic solution to flow around the center portion circumferentially into the clearance between the two adjacent layers of electrode plate of the electrode assembly to infiltrate the electrode assembly quickly and sufficiently.

According to a first alternative of the present invention, a first groove is made on a side of the periphery portion, the side being away from the electrode assembly. The first groove is configured to communicate with the first through-hole and the second through-hole.

In the above technical solution, the first groove is made on a side of the periphery portion, the side being away from the electrode assembly. In addition, the first groove communicates with the first through-hole and the second through-hole, and can guide the electrolytic solution to flow from the first through-hole to the second through-hole to enter the electrode assembly, thereby increasing a space of the current collection component at a side away from the electrode assembly, and increasing the diffusion speed of the electrolytic solution.

According to some embodiments of this application, the first groove extends to an outer peripheral surface of the periphery portion along a radial direction of the electrode assembly.

In the above technical solution, the first groove extends to the outer peripheral surface of the periphery portion, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly and the shell. In this way, the electrolytic solution fills in the shell quickly to infiltrate the electrode assembly sufficiently.

According to a second alternative of this application, the battery cell further includes: an insulator, disposed between the current collection component and the first wall, and configured to dielectrically insulate the current collection component from the first wall; a second groove is made on a side of the insulator, the side being oriented toward the current collection component; and the second groove is configured to communicate with the first through-hole and the second through-hole.

In the above technical solution, the electrolytic solution flowing out of the first through-hole enters the clearance between the insulator and the current collection component. The second groove can guide the electrolytic solution to flow from the first through-hole to the second through-hole to enter the electrode assembly, and can increase the space of the current collection component at a side away from the electrode assembly, thereby increasing the diffusion speed of the electrolytic solution.

According to some embodiments of this application, the second groove extends to an outer peripheral surface of the insulator along a radial direction of the electrode assembly.

In the above technical solution, the second groove extends to the outer peripheral surface of the insulator, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly and the shell. In this way, the electrolytic solution fills in the shell quickly to infiltrate the electrode assembly sufficiently.

According to some embodiments of this application not forming part of the present invention, the guide channel is a third groove. The third groove is made on a side of the periphery portion, the side being oriented toward the electrode assembly. The third groove communicates with the center hole.

In the above technical solution, the electrolytic solution in the center hole enters the clearance between the electrode assembly and the current collection component. The third groove can guide the electrolytic solution to diffuse to the peripheral portion, thereby increasing the diffusion speed of the electrolytic solution.

According to some embodiments of this application not forming part of the present invention, the third groove extends to an outer peripheral surface of the periphery portion along a radial direction of the electrode assembly.

In the above technical solution, the third groove extends to the outer peripheral surface of the periphery portion, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly and the shell. In this way, the electrolytic solution fills in the shell quickly to infiltrate the electrode assembly sufficiently.

According to some embodiments of this application, the shell further includes a second wall. The second wall is disposed opposite to the first wall along an axial direction of the center hole. An injection port is made on the second wall at a position corresponding to the center hole. The battery cell further includes: a sealing element, configured to seal up the injection port.

In the above technical solution, the injection port and the guide channel are arranged on two sides of the center hole in an axial direction of the center hole respectively. The electrolytic solution enters the center hole through the injection port. A part of the electrolytic solution enters the electrode assembly from the center hole. Another part of the electrolytic solution enters the guide channel. The guide channel guides the electrolytic solution to further diffuse from the center portion to the periphery portion, so as to infiltrate the electrode assembly quickly and sufficiently.

According to some embodiments of this application, a second tab is formed on the electrode assembly at an end oriented toward the second wall. The first tab and the second tab are of opposite polarities, and the second tab is electrically connected to the second wall.

In the above technical solution, the first tab of the battery cell is electrically connected to the electrode terminal. The second tab is electrically connected to the second wall. The battery cell is electrically connected to the outside through the electrode terminal and the shell, thereby simplifying the structure of the battery cell.

According to some embodiments of this application, the shell includes a housing and an end cap. The housing includes a bottom wall and a sidewall. The sidewall encloses the bottom wall. One end of the sidewall is connected to the bottom wall, and another end of the sidewall forms an opening. The end cap covers the opening. The first wall is the bottom wall, and the second wall is the end cap.

In the above technical solution, the injection port is made on the end cap. The electrode terminal is disposed on the bottom wall, and the current collection component is disposed between the bottom wall and the electrode assembly, thereby making it practicable to weld the electrode terminal to the current collection component first and then cover the opening with the end cap, and in turn, simplifying the assembling process of the battery cell.

A second aspect of this application discloses a battery, including the battery cell according to an embodiment in the second aspect of this application.

A third aspect of this application discloses an electrical device, including the battery according to an embodiment in the third aspect of this application.

An embodiment in a fourth aspect of this application discloses a method for manufacturing a battery cell, including:.

An embodiment in a further aspect of this application not forming part of the present invention discloses a piece of equipment for manufacturing a battery cell, including:.

Additional aspects and advantages of this application will be partly given in the following description, and a part thereof will become evident in the following description or will be learned in the practice of this application.

To describe technical solutions in embodiments of this application more clearly, the following outlines the drawings to be used in the embodiments. Understandably, the following drawings show merely some embodiments of this application, and therefore, are not intended to limit the scope. A person of ordinary skill in the art may derive other related drawings from the drawings without making any creative efforts.

The embodiments shown in <FIG>, <FIG> and <FIG> do not form part of the present invention.

List of reference numerals: <NUM>-vehicle; <NUM>-battery; <NUM>-battery cell; <NUM>-shell; <NUM>-housing; <NUM>-bottom wall; <NUM>-sidewall; <NUM>-end cap; <NUM>-injection port; <NUM>-opening; <NUM>-electrode assembly; <NUM>-main body; <NUM>-center hole; <NUM>-first end; <NUM>-second end; <NUM>-first tab; <NUM>-second tab; <NUM>-electrode terminal; <NUM>-current collection component; <NUM>-center portion; <NUM>-periphery portion; <NUM>-second through-hole; <NUM>-first groove; <NUM>-third groove; <NUM>-first outer peripheral surface; <NUM>-transition portion; <NUM>-first through-hole; <NUM>-first surface; <NUM>-second surface; <NUM>-electrolyte storage space; <NUM>-sealing element; <NUM>-insulator; <NUM>-third surface; <NUM>-second groove; <NUM>-fourth surface; <NUM>-second outer peripheral surface; <NUM>-box; <NUM>-first box part; <NUM>-second box part; <NUM>-controller; <NUM>-motor; <NUM>-manufacturing equipment; <NUM>-first providing apparatus; <NUM>-second providing apparatus; <NUM>-third providing apparatus; <NUM>-fourth providing apparatus; <NUM>-first assembling module; <NUM>-second assembling module.

To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following gives a clear description of the technical solutions in some embodiments of this application with reference to the drawings in some embodiments of this application. Evidently, the described embodiments are merely a part rather than all of the embodiments of this application. All other embodiments derived by a person of ordinary skill in the art based on the embodiments of this application without making any creative efforts still fall within the protection scope of this application as defined in the attached claims.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as what is normally understood by a person skilled in the technical field of this application. The terms used in the specification of this application are merely intended to describe specific embodiments but not intended to limit this application. The terms "include" and "contain" and any variations thereof used in the specification, claims, and brief description of drawings of this application are intended as non-exclusive inclusion. The terms such as "first" and "second" used in the specification, claims, and brief description of drawings herein are intended to distinguish between different items, but are not intended to describe a specific sequence or order of precedence.

Reference to "embodiment" in this application means that a specific feature, structure or characteristic described with reference to the embodiment may be included in at least one embodiment of this application. Reference to this term in different places in the specification does not necessarily represent the same embodiment, nor does it represent an independent or alternative embodiment in a mutually exclusive relationship with other embodiments. A person skilled in the art explicitly and implicitly understands that the embodiments described in this application may be combined with other embodiments.

In the description of this application, unless otherwise expressly specified and defined, the terms "mount", "concatenate", "connect", and "attach" are understood in a broad sense. For example, a "connection" may be a fixed connection, a detachable connection, or an integrated connection; or may be a direct connection or an indirect connection implemented through an intermediary; or may be internal communication between two components. A person of ordinary skill in the art is able to understand the specific meanings of the terms in this application according to specific situations.

"A plurality of" referred to in this application means two or more (including two).

In this application, a battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or the like, without being limited in embodiments of this application. The battery cell may be in various shapes such as a cylinder, flat body, or cuboid, without being limited in embodiments of this application. Depending on the form of packaging, battery cells are generally classed into three types: cylindrical battery cell, prismatic battery cell, and pouch-type battery cell.

The battery mentioned in embodiments of this application means a unitary physical module that includes one or more battery cells to provide a higher voltage and a higher capacity. For example, the battery mentioned in this application may include a battery module, a battery pack, or the like. A battery typically includes a box configured to package one or more battery cells. The box prevents liquid or other foreign matters from affecting the charging or discharging of the battery cells.

A battery cell includes an electrode assembly and an electrolytic solution. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell works primarily by shuttling metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer. A surface of the positive current collector is coated with the positive active material layer. Of the positive current collector, a part uncoated with the positive active material layer protrudes from a part coated with the positive active material layer. The part, uncoated with the positive active material layer, of the positive current collector, serves as a positive tab. Using a lithium-ion battery as an example, the positive current collector may be made of aluminum, and a positive active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, or the like. The negative electrode plate includes a negative current collector and a negative active material layer. A surface of the negative current collector is coated with the negative active material layer. Of the negative current collector, a part uncoated with the negative active material layer protrudes from a part coated with the negative active material layer, and the part uncoated with the negative active material layer serves as a negative tab. The negative current collector may be made of copper, and a negative active material may be carbon, silicon, or the like. In order to ensure passage of a large current without fusing off, the positive tab is plural in number, and the plurality of positive tabs are stacked together; the negative tab is plural in number, and the plurality of negative tabs are stacked together. The separator may be made of a material such as PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene). In addition, the electrode assembly may be of a jelly-roll type structure or a stacked type structure, without being limited herein.

The battery cell further includes a current collection component. The current collection component is configured to electrically connect a tab of the battery cell to an electrode terminal, so that electrical energy is transferred from the electrode assembly to the electrode terminal and then transferred out of the battery cell through the electrode terminal. A plurality of battery cells are electrically connected to each other by a busbar component, so as to implement series, parallel, or series-and-parallel connection between the battery cells.

In the related art, during injection of an electrolytic solution into a battery cell, the electrolytic solution can hardly diffuse after entering the shell. The electrolyte injection time is relatively long, and the injection efficiency is relatively low. Moreover, the electrolytic solution is unable to infiltrate the electrode assembly sufficiently. Consequently, the electrolytic solution is inferior in infiltrating the electrode assembly. The battery cell is prone to lithium plating during charging and discharging, and the capacitance is also be impaired.

The applicant hereof has found through research that an internal structure of a battery cell is usually compact. The close contact between an electrode assembly and a current collection component, between the current collection component and a shell, and between the electrode assembly and the shell can reduce the size of the battery cell and increase the energy density of the battery cell. In an existing battery cell, there is no channel for guiding an electrolytic solution to diffuse rapidly. After entering the shell, the electrolytic solution diffuses through a gap between two closely contacting components. The diffusion of the electrolytic solution is slow and uneven, thereby leading to low electrolyte injection efficiency of the battery cell and a poor effect of infiltrating the electrode assembly.

Based on the above conception, this application discloses a new technical solution, in which the electrolytic solution can infiltrate the electrode assembly more quickly and sufficiently, thereby not only improving the electrolyte injection efficiency of the battery cell, but also improving the capacitance and safety performance of the battery cell.

Understandably, the battery cell described in an embodiment of this application may directly supply power to an electrical device, or a plurality of battery cells may be connected in parallel or in series to form a battery that supplies power to various electrical devices.

Understandably, the electrical devices that employ the battery cell, battery module, or battery according to an embodiment of this application may come in various forms, for example, a mobile phone, a portable device, a notebook computer, an electric power cart, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool. For example, the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, and the like. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like. The electric tool includes an electric tool for metal cutting, an electric grinding tool, an electric assembly tool, an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact drill, a concrete vibrator, or an electric planer.

The battery cell and the battery described in an embodiment of this application are not only applicable to the electrical devices described above, but also applicable to all electrical devices that use a battery cell or a battery. For brevity, however, the following embodiments are described by using an electric vehicle as an example.

<FIG> is a brief schematic diagram of a vehicle according to an embodiment of this application, and <FIG> is a schematic structural diagram of a battery in the vehicle shown in <FIG>.

As shown in <FIG>, a battery <NUM>, a controller <NUM>, and a motor <NUM> are disposed inside a vehicle <NUM>. For example, the battery <NUM> may be disposed at the bottom, front, or rear of the vehicle <NUM>. The vehicle <NUM> may be an oil-fueled vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a battery electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, or the like.

In some embodiments of this application, the battery <NUM> may be configured to supply power to the vehicle <NUM>. For example, the battery <NUM> may serve as an operating power supply of the vehicle <NUM>. The controller <NUM> is configured to control the battery <NUM> to supply power to the motor <NUM>, for example, to meet electrical energy requirements in starting, navigating, or running the vehicle <NUM>.

In other embodiments, the battery <NUM> serves not only as an operating power supply of the vehicle <NUM>, but may also serve as a driving power supply of the vehicle <NUM> to provide driving power for the vehicle in place of or partly in place of fuel oil or natural gas.

The battery <NUM> referred to herein means a unitary physical module that includes one or more battery cells <NUM> to provide a higher voltage and a higher capacity. A plurality of battery cells <NUM> may be connected in series, parallel, or series-and-parallel pattern to form a battery <NUM> directly. The series-and-parallel pattern means a combination of series connection and parallel connection of the plurality of battery cells <NUM>. Alternatively, the plurality of battery cells <NUM> may be connected in series, parallel, or series-and-parallel pattern to form a battery <NUM> module first, and then a plurality of battery <NUM> modules may be connected in series, parallel, or series-and-parallel pattern to form a battery <NUM>.

In <FIG>, the battery <NUM> includes a plurality of battery cells <NUM> and a box <NUM>. The plurality of battery cells <NUM> are accommodated in the box <NUM>. The box <NUM> includes a first box part <NUM> and a second box part <NUM>. The first box part <NUM> and the second box part <NUM> fit and cover each other to form a battery <NUM> cavity. A plurality of battery <NUM> modules are placed in the battery <NUM> cavity. The shapes of the first box part <NUM> and the second box part <NUM> may depend on the shape of a combination of the plurality of battery <NUM> modules. The first box part <NUM> and the second box part <NUM> each may include one opening. For example, the first box part <NUM> and the second box part <NUM> each may be a hollow cuboid, and each may include only one opening surface. The opening of the first box part <NUM> is opposite to the opening of the second box part <NUM>. The first box part <NUM> and the second box part <NUM> are snap-fitted to each other to form a box <NUM> that includes a closed cavity. The plurality of battery cells <NUM> are combined by being connected in parallel, series, or series-and-parallel pattern, and then placed into the box <NUM> that is formed by snap-fitting the first box part <NUM> and the second box part <NUM>.

<FIG> is an exploded view of a battery cell according to some embodiments of this application, and <FIG> is a cross-sectional view of the battery cell shown in <FIG>.

As shown in <FIG> and <FIG>, the battery cell <NUM> includes a shell <NUM>, an electrode assembly <NUM>, electrode terminals <NUM>, a current collection component <NUM>, and a sealing element <NUM>.

The shell <NUM> includes a housing <NUM> and an end cap <NUM>. The housing <NUM> includes a bottom wall <NUM> and a sidewall <NUM>. The sidewall <NUM> encloses the bottom wall <NUM>. One end of the sidewall <NUM> is connected to the bottom wall <NUM>, and another end of the sidewall forms an opening <NUM>. The end cap <NUM> covers the opening <NUM> to seal the electrode assembly <NUM> inside the shell <NUM>.

An electrode lead-out hole is made on one of the bottom wall <NUM> or the end cap <NUM>. The electrode terminal <NUM> is dielectrically mounted in the electrode lead-out hole. A plastic piece with a through-hole is disposed in the electrode lead-out hole. The electrode terminal <NUM> is mounted in the through-hole so as to be dielectrically mounted in the electrode lead-out hole.

The housing <NUM> may be cylindrical or elliptically cylindrical, or hexahedral. The housing <NUM> may be made of a metal material, such as aluminum, an aluminum alloy, or nickel-clad steel. The end cap <NUM> is of a plate-shaped structure. The size and shape of the end cap <NUM> match the opening <NUM> of the housing <NUM>. The end cap <NUM> is fixed to the opening <NUM> of the housing <NUM>, so as to seal the electrode assembly <NUM> and the electrolytic solution in an accommodation cavity of the housing <NUM>. The end cap <NUM> is made of a metal material such as aluminum or steel.

In some embodiments of this application, the housing <NUM> is a cylinder. The axial direction of the housing <NUM> extends along a first axis P. The radial direction of the housing extends along the first direction R. The first axis P is perpendicular to the first direction R. The end cap <NUM> is of a circular plate structure. In other embodiments, the housing <NUM> may be a hexahedron instead, and the end cap <NUM> may be of a square or rectangular plate structure.

The electrode assembly <NUM> is disposed in the shell <NUM>, and the electrode assembly <NUM> includes a main body <NUM>, a first tab <NUM>, and a second tab <NUM>. The main body <NUM> includes a positive electrode plate, a negative electrode plate, and a separator. The separator is located between the positive electrode plate and the negative electrode plate, and is configured to separate the positive electrode plate from the negative electrode plate. The first tab <NUM> and the second tab <NUM> are of opposite polarities. The first tab <NUM> is connected to the electrode terminal <NUM> by the current collection component <NUM>. The second tab <NUM> is electrically connected to the shell <NUM>. Among the first tab <NUM> and the second tab <NUM>, the first tab <NUM> is a positive tab, and the second tab <NUM> is a negative tab. The second tab <NUM> may contact the shell <NUM> directly, or connected to the shell <NUM> by another current collection component. The current collection component <NUM> corresponding to the first tab <NUM> is made of an aluminum material. Based on the implementation of "the second tab <NUM> is connected to the shell <NUM> by another current collection component", the current collection component corresponding to the second tab <NUM> is made of a copper material.

The current collection component <NUM> is configured to connect the first tab <NUM> and the electrode terminal <NUM>. The current collection component <NUM> includes a center portion <NUM> and a periphery portion <NUM>. The center portion <NUM> positionally corresponds to the center hole <NUM>. The center portion <NUM> is configured to be connected to the electrode terminal <NUM>. The periphery portion <NUM> is configured to be connected to the first tab <NUM>.

The thickness direction of the current collection component <NUM> extends along the first axis P. The size and shape of the current collection component <NUM> may match the housing <NUM>, or may mismatch the size and shape of the housing <NUM>.

In some embodiments of this application, the housing <NUM> is cylindrical, and the current collection component <NUM> is of a circular plate-shaped structure with the first axis P used as an axis. In other embodiments, the housing <NUM> may be hexahedral instead, and the current collection component <NUM> is of a quadrilateral plate-shaped structure with a thickness direction extending along the first axis P.

As shown in <FIG> and <FIG>, an injection port <NUM> is made on the shell <NUM>. The injection port <NUM> is configured to pour an electrolytic solution into the shell <NUM>. The sealing element <NUM> is configured to seal the injection port <NUM> after completion of the injection. The injection port <NUM> may be sealed up by a pop rivet process. After completion of the pop rivet process, a sealing element <NUM> is formed. Alternatively, the sealing element <NUM> may be an elastomer made of a material such as rubber and silicone. The elastomer is embedded into the injection port <NUM> to seal up the injection port <NUM>.

As shown in <FIG> and <FIG>, some embodiments of this application disclose a battery cell <NUM>, including a shell <NUM>, an electrode assembly <NUM>, and a current collection component <NUM>. The shell <NUM> includes a first wall. An electrode terminal <NUM> is dielectrically mounted on the first wall. The electrode assembly <NUM> is disposed in the shell <NUM>. The electrode assembly <NUM> includes a center hole <NUM>. A first tab <NUM> is formed at an end of the electrode assembly <NUM>, the end being oriented toward the first wall. The current collection component <NUM> is disposed between the first wall and the electrode assembly <NUM>. The current collection component <NUM> includes a center portion <NUM> and a periphery portion <NUM>. The center portion <NUM> positionally corresponds to the center hole <NUM>. The center portion <NUM> is configured to be connected to the electrode terminal <NUM>. The periphery portion <NUM> is configured to be connected to the first tab <NUM>. A guide channel is disposed on the current collection component <NUM>. The guide channel is configured to guide an electrolytic solution in the center hole <NUM> to diffuse from the center portion <NUM> to the periphery portion <NUM>.

The electrode assembly <NUM> is formed by winding. The center hole <NUM> is a winding center of the electrode assembly <NUM>. The center hole <NUM> runs through the main body <NUM> along the first axis P. Of the center hole <NUM>, an end close to the first wall is a first end <NUM>, and an end away from the first wall is a second end <NUM>, as viewed along an extension direction of the first axis P.

The first wall is arranged on the same side as the first tab of the electrode assembly. The first wall is a part of the wall of the shell. In some embodiments of this application, the first wall is a bottom wall <NUM>, and the electrode terminal <NUM> is dielectrically disposed on the bottom wall <NUM>. In other embodiments, the first wall may be an end cap <NUM> instead, and the electrode terminal <NUM> is dielectrically disposed on the end cap <NUM>.

The injection port <NUM> may be made on the first wall, or on another wall of the shell. In some embodiments of this application, along the extension direction of the first axis P, the injection port <NUM> and the electrode terminal <NUM> are disposed on different sides respectively. The injection port <NUM> positionally corresponds to the second end <NUM> of the center hole <NUM>. The electrolytic solution flows from the second end <NUM> of the center hole <NUM> to the first end <NUM>, and then diffuses to the periphery portion <NUM> of the current collection component <NUM> through the guide channel. In other embodiments, the injection port <NUM> and the electrode terminal <NUM> may be disposed on the same side. The injection port <NUM> positionally corresponds to the first end <NUM> of the center hole <NUM>. The electrolytic solution flows into the center hole <NUM> from the first end <NUM> of the center hole <NUM>, and then diffuses to the periphery portion <NUM> of the current collection component <NUM> through the guide channel.

The current collection component <NUM> may be implemented in various forms. The center portion <NUM> may be of a circular plate structure or a rectangular plate structure. The periphery portion <NUM> may be of a closed annular structure disposed around the center portion <NUM> circumferentially, or an unclosed annular structure disposed around the center portion <NUM> circumferentially. The edge of the center portion <NUM> may be directly connected to the periphery portion <NUM>. The center portion <NUM> may be flush with the surface of the periphery portion <NUM>; or, the center portion <NUM> may protrude beyond the periphery portion <NUM> toward the electrode terminal <NUM>. The central axis of the center portion <NUM> may coincide with the central axis of the periphery portion <NUM>. For example, the center portion <NUM> is of a disc structure, and the periphery portion <NUM> is of a ring structure arranged around the central axis of the disc structure circumferentially. Alternatively, the central axis of the center portion <NUM> does not coincide with the central axis of the periphery portion <NUM>, so as to implement reliable connection to the electrode terminal.

The center portion <NUM> positionally corresponds to the center hole <NUM>, so that the electrolytic solution in the center hole <NUM> enters the guide channel from the first end <NUM>, and diffuses from the center portion <NUM> to the periphery portion <NUM>. The center portion <NUM> and the center hole <NUM> may be arranged coaxially or non-coaxially. In some embodiments of this application, the central axis of the center portion <NUM> coincides with the axis of the center hole <NUM>, so that the central axis of the center portion <NUM> is also known as the first axis P. In other embodiments, the central axis of the center portion <NUM> may be parallel to or inclined against the first axis P instead.

The guide channel is configured to guide the electrolytic solution to diffuse from the center hole <NUM> to the periphery portion <NUM>. The guide channel may be implemented in various forms. The guide channel may be a through-hole made at the edge of the center portion <NUM>. The electrolytic solution flows from the first through-hole <NUM> to a side of the current collection component <NUM> and diffuses to the periphery portion <NUM>, the side of the current collection component being away from the electrode assembly <NUM>. Alternatively, the guide channel may be a groove made on a side of the periphery portion <NUM>, the side being oriented toward the electrode assembly <NUM>. The electrolytic solution enters a clearance between the current collection component <NUM> and the electrode assembly <NUM> through the groove, and diffuses toward the periphery portion <NUM>.

One end of the guide channel communicates with the center hole <NUM>, and another end of the guide channel may extend to the periphery portion <NUM>, or extend to the edge of the current collection component <NUM>. Further, the other end of the guide channel may extend to the edge of the current collection component <NUM> along the first direction R, or may helically coil around the first axis P to the edge of the current collection component <NUM>.

One guide channel may be provided alone. All the electrolytic solution in the center hole <NUM> is diffused from the center portion <NUM> to the periphery portion <NUM> through one guide channel. Alternatively, a plurality of guide channels may be provided, and the plurality of guide channels are distributed at intervals around the first axis P circumferentially. The electrolytic solution in the center hole <NUM> enters the plurality of guide channels. The plurality of guide channels jointly guide the electrolytic solution to diffuse from the center portion <NUM> to the periphery portion <NUM>.

During injection of the electrolytic solution into the battery cell <NUM>, the electrolytic solution enters the center hole <NUM>. The guide channel guides the electrolytic solution in the center hole <NUM> to diffuse from the center portion <NUM> to the periphery portion <NUM>, so as to quickly and sufficiently infiltrate the electrode assembly <NUM>, thereby not only improving the electrolyte injection efficiency and assembling efficiency of the battery cell <NUM>, but also improving the capacitance and stability of the battery cell <NUM>.

As shown in <FIG> and <FIG>, in some embodiments of this application, the shell <NUM> further includes a second wall. The second wall is disposed opposite to the first wall along an axial direction of the center hole <NUM>. An injection port <NUM> is made on the second wall at a position corresponding to the center hole <NUM>. The battery cell <NUM> further includes: a sealing element <NUM>, configured to seal up the injection port <NUM>.

The axial direction of the center hole <NUM> extends along the first axis P. The second wall and the first wall are arranged on two sides of the center hole <NUM> respectively along the first axis P. The second wall is located at a second end <NUM> of the center hole <NUM>, so that the injection port <NUM> and the guide channel of the current collection component <NUM> are arranged on different sides respectively. Based on the implementation of "the first wall is a bottom wall <NUM>", the second wall is an end cap <NUM>, and the injection port <NUM> is made on the end cap <NUM>. Based on the implementation of "the first wall is an end cap <NUM>", the second wall is a bottom wall <NUM>, and the injection port <NUM> is made on the bottom wall <NUM>.

In the above form of structure, the injection port <NUM> and the guide channel are arranged on two sides of the center hole <NUM> in an axial direction of the center hole respectively. The electrolytic solution enters the center hole <NUM> through the injection port <NUM>. A part of the electrolytic solution enters the electrode assembly <NUM> from the center hole <NUM>. Another part of the electrolytic solution enters the guide channel. The guide channel guides the electrolytic solution to further diffuse from the center portion <NUM> to the periphery portion <NUM>, so as to infiltrate the electrode assembly <NUM> quickly and sufficiently.

As shown in <FIG> and <FIG>, in some embodiments of this application, a second tab <NUM> is formed on the electrode assembly <NUM> at an end oriented toward the second wall. The first tab <NUM> and the second tab <NUM> are of opposite polarities, and the second tab <NUM> is electrically connected to the second wall.

Based on the above implementation of "the first wall is a bottom wall <NUM>, and the second wall is an end cap <NUM>", the second tab <NUM> is connected to the end cap <NUM> by another current collection component <NUM>. The current collection component <NUM> equipped with a guide channel is disposed between the bottom wall <NUM> and the electrode assembly <NUM>. The center portion <NUM> of the current collection component <NUM> is connected to the electrode terminal <NUM>. The periphery portion <NUM> is connected to the first tab <NUM>.

Based on the above implementation of "the first wall is an end cap <NUM>, and the second wall is a bottom wall <NUM>", the second tab <NUM> is connected to the bottom wall <NUM> by another current collection component <NUM>. The current collection component <NUM> equipped with a guide channel is disposed between the end cap <NUM> and the electrode assembly <NUM>. The center portion <NUM> of the current collection component <NUM> is connected to the electrode terminal <NUM>. The periphery portion <NUM> is connected to the first tab <NUM>.

In the above form of structure, the first tab <NUM> of the battery cell <NUM> is electrically connected to the electrode terminal <NUM>. The second tab <NUM> is electrically connected to the second wall. Serving as a negative electrode of the battery cell <NUM>, the shell <NUM> is electrically connected to the outside, thereby simplifying the structure of the battery cell <NUM>.

As shown in <FIG> and <FIG>, in some embodiments of this application, the shell <NUM> includes a housing <NUM> and an end cap <NUM>. The housing <NUM> includes a bottom wall <NUM> and a sidewall <NUM>. The sidewall <NUM> encloses the bottom wall <NUM>. One end of the sidewall <NUM> is connected to the bottom wall <NUM>, and the other end of the sidewall forms an opening <NUM>. The end cap <NUM> covers the opening <NUM>. The first wall is the bottom wall <NUM>, and the second wall is the end cap <NUM>.

In the above form of structure, the injection port <NUM> is made on the end cap <NUM>, so as to be easily formable. The electrode terminal <NUM> is disposed on the bottom wall <NUM>. The current collection component <NUM> is disposed between the bottom wall <NUM> and the electrode assembly <NUM>, thereby making it practicable to weld the electrode terminal <NUM> to the current collection component <NUM> first and then cover the opening <NUM> with the end cap <NUM>, and in turn, simplifying the assembling process of the battery cell <NUM>.

<FIG> is a schematic structural diagram of a first form of current collection component of a battery cell according to some embodiments of this application, and <FIG> is a schematic structural diagram of how a guide channel of the current collection component shown in <FIG> fits with a center hole.

As shown in <FIG>, in some embodiments of this application, the guide channel is a first through-hole <NUM>, and the first through-hole <NUM> is located at an edge of the center portion <NUM>.

The "edge of the center portion <NUM>" may be a transition structure between the center portion <NUM> and the periphery portion <NUM>, or may be a part of the periphery portion <NUM>, the part being close to the center portion <NUM>.

The first through-hole <NUM> runs through the current collection component <NUM> along a thickness direction of the current collection component <NUM>, so as to guide the electrolytic solution to enter a side of the current collection component <NUM>, the side being away from the electrode assembly <NUM>. In this way, the electrolytic solution is further diffused to the periphery portion <NUM>.

As shown in <FIG>, in some embodiments of this application, the current collection component <NUM> is of a flat panel structure with a level surface. The center portion <NUM> is directly connected to the periphery portion <NUM>. On a plane perpendicular to the first axis P, the center portion <NUM> is flush with the surface of the periphery portion <NUM>. The axial direction of the first through-hole <NUM> is parallel to the first axis P.

In other embodiments, the current collection component <NUM> may be of a flat panel structure with a non-level surface instead. On the plane perpendicular to the first axis P, the center portion <NUM> protrudes beyond the periphery portion <NUM>. The transition portion <NUM> connects the center portion <NUM> and the periphery portion <NUM>. The axial direction of the first through-hole <NUM> is parallel to the first direction R.

One first through-hole <NUM> may be provided alone. All the electrolytic solution in the center hole <NUM> is diffused from the center portion <NUM> to the periphery portion <NUM> through one first through-hole <NUM>. Alternatively, a plurality of first through-holes <NUM> may be provided, and the plurality of first through-holes <NUM> are distributed at intervals around the first axis P circumferentially. The electrolytic solution in the center hole <NUM> enters the plurality of first through-holes <NUM>. The plurality of first through-holes <NUM> jointly guide the electrolytic solution to diffuse from the center portion <NUM> to the periphery portion <NUM>. The first through-hole <NUM> may be a round hole, or an elliptical hole, a rectangular hole, a triangular hole, or an arc-shaped hole.

In the above form of structure, the first through-hole <NUM> is located at the edge of the center portion <NUM>. Through the first through-hole <NUM>, the electrolytic solution flows from one side to the other side of the current collection component <NUM>, the one side being close to the electrode assembly <NUM>, and the other side being close to the first wall. In this way, the electrolytic solution is diffused to the periphery portion <NUM> to quickly and sufficiently infiltrate the electrode assembly <NUM>.

<FIG> is a schematic structural diagram of a second form of current collection component of a battery cell according to some embodiments of this application, and <FIG> is a schematic structural diagram of how a guide channel of the current collection component shown in <FIG> fits with a center hole.

As shown in <FIG>, in some embodiments of this application, the center portion <NUM> protrudes beyond the periphery portion <NUM> toward the electrode terminal <NUM>. The current collection component <NUM> further includes a transition portion <NUM>. The transition portion <NUM> encloses the center portion <NUM>. The transition portion <NUM> connects the center portion <NUM> and the periphery portion <NUM>. The first through-hole <NUM> is disposed in the transition portion <NUM>.

Along the extension direction of the first axis P, the center portion <NUM> protrudes beyond the periphery portion <NUM> toward the electrode terminal <NUM> and is connected to the electrode terminal <NUM>. The transition portion <NUM> connects the center portion <NUM> and the periphery portion <NUM>, thereby electrically connecting the center portion <NUM> and the periphery portion <NUM> and facilitating formation of the first through-hole <NUM> in the transition portion <NUM>.

Along the extension direction of the first axis P, the first through-hole <NUM> may be made in the middle of the transition portion <NUM>, or may be made on a side of the transition portion <NUM>, the side being close to the center portion <NUM> or the periphery portion <NUM>. The first through-hole <NUM> may be entirely located in the transition portion <NUM>, or may extend to the center portion <NUM> or the periphery portion <NUM> through the transition portion <NUM>.

The center portion <NUM> may protrude toward the electrode terminal <NUM> in various ways. The center portion <NUM> may be formed by a stamping process; or, the center portion <NUM> and the periphery portion <NUM> are provided independently and then welded together.

The center portion <NUM> and the transition portion <NUM> close in to form an electrolyte storage space <NUM> that communicates with the first end <NUM> of the center hole <NUM>. The first through-hole <NUM> runs through the transition portion <NUM> along the thickness direction of the transition portion <NUM>, so that the electrolytic solution is guided to flow from the electrolyte storage space <NUM> to a side of the current collection component <NUM>, the side being away from the electrode assembly <NUM>. The thickness direction of the transition portion <NUM> may extend along the first direction R, or may extend along another direction inclined against the first axis P.

In the above form of structure, the center portion <NUM> protrudes beyond the periphery portion <NUM> toward the electrode terminal <NUM>, and combines with the transition portion <NUM> to form an electrolyte storage space <NUM> that communicates with the center hole <NUM>. The first through-hole <NUM> is made in the transition portion <NUM>. Therefore, after entering the electrolyte storage space <NUM> along the axial direction of the center hole <NUM>, the electrolytic solution flows along a perforation direction of the first through-hole <NUM> to a side of the current collection component <NUM>, the side being close to the first wall. Because the electrolytic solution continues to diffuse to the periphery portion <NUM> along the perforation direction of the first through-hole <NUM>, the electrolytic solution can infiltrate the electrode assembly <NUM> quickly and sufficiently.

As shown in <FIG>, in some embodiments of this application, the first through-hole <NUM> is plural in number. The plurality of first through-holes <NUM> are disposed around the center portion <NUM> at intervals.

Specifically, the transition portion <NUM> is disposed around the first axis P, and the radial direction of the transition portion <NUM> extends along the first direction R. Axes of the plurality of first through-holes <NUM> are located on the same plane perpendicular to the first axis P.

As shown in <FIG>, in some embodiments of this application, the shape and opening size are identical between the plurality of first through-holes <NUM>, so that all the first through-holes <NUM> allow passage of the same amount of electrolytic solution. The plurality of first through-holes <NUM> are arranged evenly around the center portion <NUM> circumferentially so that the electrolytic solution is guided to diffuse circumferentially at equal intervals.

In other embodiments, the shape and opening size may vary between the plurality of first through-holes <NUM>. The plurality of first through-holes <NUM> may be arranged unevenly instead around the center portion <NUM> circumferentially. By flexibly arranging the location and number of the first through-holes <NUM>, the space required by other components inside the battery cell <NUM> is vacated, and the strength of the current collection component <NUM> is increased, thereby preventing the current collection component <NUM> from fracturing due to excessive holes made in the transition portion <NUM>.

The number of the first through-holes <NUM> may be two to six, thereby not only increasing the diffusion speed of the electrolytic solution, but also ensuring the strength of the current collection component <NUM>.

For example, as shown in <FIG>, four first through-holes <NUM> are made. The four first through-holes <NUM> are arranged in the transition portion <NUM> at intervals around the first axis P circumferentially. Two adjacent first through-holes <NUM> are arranged at intervals of <NUM>° around the first axis P.

In the above form of structure, the plurality of first through-holes <NUM> are arranged around the center portion <NUM> at intervals, thereby guiding the electrolytic solution to diffuse to the periphery portion <NUM> around the center portion <NUM> circumferentially, and making the electrolytic solution infiltrate the electrode assembly <NUM> quickly and sufficiently.

In some embodiments of this application, along a circumference of the center portion <NUM>, a total length of the plurality of first through-holes <NUM> is greater than or equal to <NUM>/<NUM> of a perimeter of the transition portion <NUM>.

Understandably, "the total length of the transition portion <NUM> along the circumference of the center portion <NUM>" means a length of the outer sidewall <NUM> of the transition portion <NUM> in circumference around the first axis P along the extension direction of the first axis P, as measured at a middle position of a part perforated with the first through-holes <NUM>. The "total length of the plurality of first through-holes <NUM> along the circumference of the center portion <NUM>" means a total length occupied by all the first through-holes <NUM> as measured at the "middle position of a part perforated with the first through-holes <NUM>".

Based on the implementation of "one first through-hole <NUM> is provided alone", the first through-hole <NUM> is made in the transition portion <NUM> in an all-through manner around the first axis P, and occupies at least an <NUM>° segment of the circumference of the transition portion <NUM>. The remaining segment of the circumference of the transition portion <NUM> is a connection region. The connection region is configured to connect the center portion <NUM> and the periphery portion <NUM>. Based on the implementation of "the four first through-holes <NUM> are arranged at equal intervals around the center portion <NUM>", each first through-hole <NUM> occupies at least a <NUM>° segment of the circumference of the transition portion <NUM>. Two adjacent first through-holes <NUM> are interspaced with a connection region. The connection region is configured to connect the center portion <NUM> and the periphery portion <NUM>.

In the above form of structure, the flow area of the transition portion <NUM> is smaller than the flow area of the center portion <NUM> and the periphery portion <NUM>. Therefore, when an internal current of the battery cell <NUM> is excessive, the current collection component <NUM> can be fused off in time, thereby electrically disconnecting the electrode terminal <NUM> from the first tab <NUM>, and achieving relatively high safety performance of the battery cell <NUM>.

In some embodiments of this application, the first through-hole <NUM> is an arc-shaped hole that extends along a circumference of the center portion <NUM>.

Understandably, that "the first through-hole <NUM> is an arc-shaped hole that extends along a circumference of the center portion <NUM>" means that, on a plane perpendicular to the first axis P, a projection of the first through-hole <NUM> assumes an arc shape that curves around the first axis P.

Based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals", all the four first through-holes <NUM> are arc-shaped holes that extend along the circumference of the center portion <NUM>.

In the above form of structure, the first through-hole <NUM> is an arc-shaped hole that extends along the circumference of the center portion <NUM>, thereby not only increasing the opening area of the first through-hole <NUM> and facilitating diffusion of the electrolytic solution, but also reducing a protruding height by which the center portion <NUM> protrudes beyond the periphery portion <NUM>, thinning the current collection component <NUM>, making the battery cell <NUM> structurally compact, and achieving a relatively high energy density.

<FIG> is a schematic structural diagram of a third form of current collection component of a battery cell according to some embodiments of this application, and <FIG> is a schematic structural diagram of how a guide channel of the current collection component shown in <FIG> fits with a center hole.

As shown in <FIG>, in some embodiments of this application, a second through-hole <NUM> is made on the periphery portion <NUM>. The second through-hole <NUM> is farther away from the center portion <NUM> than the first through-hole <NUM>.

The second through-hole <NUM> runs through the periphery portion <NUM> along the thickness of the periphery portion <NUM>. On the plane perpendicular to the first axis P, a projection of the second through-hole <NUM> can fully fall within a projection of the electrode assembly <NUM>. The electrolytic solution enters the clearance between two adjacent layers of electrode plate of the electrode assembly <NUM> through the second through-hole <NUM> to infiltrate the electrode assembly <NUM>. The projection of the second through-hole <NUM> can partly fall within the projection of the electrode assembly <NUM>. A part of the electrolytic solution enters the clearance between the two adjacent layers of electrode plate of the electrode assembly <NUM> through the second through-hole <NUM>, and another part of the electrolytic solution flows to the edge of the electrode assembly <NUM> to enter a gap between the electrode assembly <NUM> and the shell <NUM> (referring to <FIG>), thereby quickly and sufficiently entering the electrode assembly <NUM>.

One second through-hole <NUM> may be provided alone. All the electrolytic solution enters the electrode assembly <NUM> from the periphery portion <NUM> through one second through-hole <NUM>. Alternatively, a plurality of second through-holes <NUM> may be provided. The plurality of second through-holes <NUM> are distributed at intervals around the first axis P circumferentially. The electrolytic solution enters the plurality of second through-holes <NUM>. The plurality of second through-holes <NUM> jointly guide the electrolytic solution into the electrode assembly <NUM> from the periphery portion <NUM>, so as to evenly infiltrate the electrode assembly <NUM> circumferentially. Alternatively, a plurality of groups of second through-holes <NUM> may be provided. The plurality of groups of second through-holes <NUM> are distributed around the first axis P circumferentially at intervals. Each group of second through-holes <NUM> includes a plurality of second through-holes <NUM> arranged at intervals along the first direction R, so as to sufficiently guide the electrolytic solution to diffuse in the first direction R.

The second through-hole <NUM> may be a round hole, or an elliptical hole, a rectangular hole, a triangular hole, or a hole in other shapes.

In the above form of structure, the second through-hole <NUM> is made in the periphery portion <NUM>, and can partly expose a clearance between two adjacent layers of electrode plate of the electrode assembly. Through the second through-hole <NUM>, the electrolytic solution can enter the clearance between the two adjacent layers of electrode plate of the electrode assembly <NUM> to infiltrate the electrode assembly <NUM> quickly and sufficiently.

As shown in <FIG>, in some embodiments of this application, the second through-hole <NUM> is plural in number. The plurality of second through-holes <NUM> are disposed around the center portion <NUM> at intervals.

As shown in <FIG>, in some embodiments of this application, the shape and opening size may be identical between the plurality of second through-holes <NUM>, so that all the second through-holes <NUM> allow passage of the same amount of electrolytic solution. The plurality of second through-holes <NUM> may be arranged evenly around the center portion <NUM> circumferentially so that the electrolytic solution is guided to diffuse circumferentially at equal intervals.

In other embodiments, the shape and opening size may vary between the plurality of second through-holes <NUM>. The plurality of second through-holes <NUM> may be arranged unevenly instead around the center portion <NUM> circumferentially. By flexibly arranging the location and number of the second through-holes <NUM>, the space required by other components inside the battery cell <NUM> is vacated, and the strength of the current collection component <NUM> is increased, thereby preventing the current collection component from being prone to fracture due to excessive holes made in the transition portion <NUM>.

As shown in <FIG>, in some embodiments of this application, the second through-holes <NUM> may be disposed corresponding to the first through-holes <NUM>. Based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals", four first through-holes <NUM> are provided, and four second through-holes <NUM> are provided. The first through-holes <NUM> are in one-to-one correspondence with the second through-holes <NUM>. The second through-holes <NUM> and the corresponding first through-holes <NUM> are arranged at intervals along the radial direction of the battery cell <NUM> (that is, the first direction R). In this way, the electrolytic solution is guided to flow from the first through-holes <NUM> to the second through-holes <NUM> along the first direction R, and to enter the electrode assembly <NUM> through the second through-holes <NUM>.

In other embodiments, the number and locations of the second through-holes <NUM> may be disposed independently from the number and locations of the first through-holes <NUM>. For example, four first through-holes <NUM> are made. The four first through-holes <NUM> are arranged in the transition portion <NUM> around the first axis P at equal intervals. Six second through-holes <NUM> are made. The six second through-holes <NUM> are arranged in the periphery portion <NUM> around the first axis P at equal intervals.

In the above form of structure, the plurality of second through-holes <NUM> are arranged around the center portion <NUM> at intervals, thereby guiding the electrolytic solution to flow around the center portion <NUM> circumferentially into the clearance between the two adjacent layers of electrode plate of the electrode assembly <NUM> to infiltrate the electrode assembly <NUM> quickly and sufficiently.

As shown in <FIG>, in some embodiments of this application, a first groove <NUM> is made on a side of the periphery portion <NUM>, the side being away from the electrode assembly <NUM>. The first groove <NUM> is configured to communicate with the first through-hole <NUM> and the second through-hole <NUM>.

Along the thickness direction of the current collection component <NUM>, a first surface <NUM> is included in a side of the current collection component <NUM>, the side being away from the electrode assembly <NUM>. A second surface <NUM> is included in a side oriented toward the electrode assembly <NUM>. The first groove <NUM> is made on the first surface <NUM>.

The first groove <NUM> may be formed by a stamping process, or may be formed by a planing and milling process. One end of the first groove <NUM> communicates with the first through-hole <NUM>, and the other end of the first groove may extend to the second through-hole <NUM>. The first through-hole <NUM> may be formed inside the first groove <NUM> instead, and the other end of the first groove <NUM> extends to the edge of the periphery portion <NUM>. The first groove <NUM> may extend along the first direction R, or extend helically around the first axis P or extend along other directions.

A depth of the first groove <NUM> may be uniform along the extension direction of the first groove <NUM>, so as to simplify the shape of the first groove <NUM> and make it easy to process and form the current collection component <NUM>. The depth of the first groove <NUM> may vary instead along the extension direction of the first groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the depth of the first groove <NUM> increases gradually in a direction from the first through-hole <NUM> to the second through-hole <NUM>. A width of the first groove <NUM> may be uniform, so as to simplify the shape of the first groove <NUM> and make it easy to process and form the current collection component <NUM>. The width of the first groove <NUM> may vary instead along the extension direction of the first groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the width of the first groove <NUM> increases gradually in a direction from the first through-hole <NUM> to the second through-hole <NUM>.

As shown in <FIG>, in some embodiments of this application, in a direction around the first axis P, diameters of the first through-hole <NUM> and the second through-hole <NUM> are identical to the width of the first groove <NUM>, so as to reduce the perforation area of the first groove <NUM>, and make the current collection component <NUM> stronger and less prone to break off. In other embodiments, the width of the first groove <NUM> may be greater than the diameters of the first through-hole <NUM> and the second through-hole <NUM> instead, so as to increase the diffusion speed of the electrolytic solution.

As shown in <FIG>, based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals, and the second through-holes <NUM> are arranged corresponding to the first through-holes <NUM>", four first grooves <NUM> are provided. The four first grooves <NUM> are arranged around the first axis P at intervals. Each first groove <NUM> communicates with the corresponding first through-hole <NUM> and second through-hole <NUM>.

In the above form of structure, the first groove <NUM> is made on a side of the periphery portion <NUM>, the side being away from the electrode assembly <NUM>. In addition, the first groove <NUM> communicates with the first through-hole <NUM> and the second through-hole <NUM>, and can guide the electrolytic solution to flow from the first through-hole <NUM> to the second through-hole <NUM> to enter the electrode assembly <NUM>, thereby increasing a space of the current collection component <NUM> at a side away from the electrode assembly <NUM>, and increasing the diffusion speed of the electrolytic solution.

As shown in <FIG>, in some embodiments of this application, the first groove <NUM> extends to an outer peripheral surface of the periphery portion <NUM> along a radial direction of the electrode assembly <NUM>.

Specifically, the outer peripheral surface of the periphery portion <NUM> around the first axis P is a first outer peripheral surface <NUM>. The first groove <NUM> may extend along the first direction R, or extend helically around the first axis P, or extend along other directions.

As shown in <FIG>, based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals, and the second through-holes <NUM> are arranged corresponding to the first through-holes <NUM>", the first through-holes <NUM> and the corresponding second through-holes <NUM> are arranged at intervals along the first direction R. The first groove <NUM> extends to the first outer peripheral surface <NUM> along the first direction R to communicate with the first through-hole <NUM> and the corresponding second through-hole <NUM>.

In the above form of structure, the first groove <NUM> extends to the outer peripheral surface of the periphery portion <NUM>, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly <NUM> and the shell <NUM>. In this way, the electrolytic solution fills in the shell <NUM> quickly to infiltrate the electrode assembly <NUM> sufficiently.

<FIG> is a schematic structural diagram of an insulator in a battery cell according to some embodiments of this application, and <FIG> is a schematic structural diagram of how the insulator in <FIG> fits with a guide channel of a current collection component.

As shown in <FIG>, in some embodiments of this application, the battery cell <NUM> further includes: an insulator <NUM>, disposed between the current collection component <NUM> and the first wall, and configured to dielectrically insulate the current collection component <NUM> from the first wall. A second groove <NUM> is made on a side of the insulator <NUM>, the side being oriented toward the current collection component <NUM>. The second groove <NUM> is configured to communicate with the first through-hole <NUM> and the second through-hole <NUM>.

The thickness direction of the insulator <NUM> extends along the first axis P. Of the insulator <NUM>, the side oriented toward the current collection component <NUM> includes a third surface <NUM>, and the side oriented toward the first wall includes a fourth surface <NUM>. The second groove <NUM> is made on the third surface <NUM>.

The shape of the insulator <NUM> may match the shape of the housing <NUM>. For example, when the housing <NUM> is a cylinder, the shape of the insulator <NUM> is of a circular plate-shaped structure. The shape of the insulator <NUM> may be independent of the shape of the housing <NUM> instead. For example, when the housing <NUM> is a cylinder, the shape of the insulator <NUM> may be of a quadrilateral plate-shaped structure.

Based on the implementation of "the first wall is a bottom wall <NUM>", the insulator <NUM> is a lower plastic sheet configured to dielectrically insulate the current collection component <NUM> from the bottom wall <NUM>. Alternatively, the insulator <NUM> may be an additional component to facilitate diffusion of the electrolytic solution.

The insulator <NUM> may be injection-molded. The second groove <NUM> is directly formed on the third surface <NUM> of the insulator <NUM>, or the second groove <NUM> may be formed by planing. One end of the second groove <NUM> communicates with the first through-hole <NUM>, and the other end of the second groove may extend to the second through-hole <NUM>. The second groove <NUM> may extend to the edge of the insulator <NUM> instead. On a plane perpendicular to the first axis P, a projection of the second through-hole <NUM> falls within a projection of the second groove <NUM>. The second groove <NUM> may extend along the first direction R, or extend helically around the first axis P, or extend along other directions.

A depth of the second groove <NUM> may be uniform along the extension direction of the second groove <NUM>, so as to simplify the shape of the second groove <NUM> and make it easy to process and form the insulator <NUM>. The depth of the second groove <NUM> may vary instead along the extension direction of the second groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the depth of the second groove <NUM> increases gradually in a direction from the first through-hole <NUM> to the second through-hole <NUM>. A width of the second groove <NUM> may be uniform, so as to simplify the shape of the second groove <NUM> and make it easy to process and form the current collection component <NUM>. The width of the second groove <NUM> may vary instead along the extension direction of the second groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the width of the second groove <NUM> increases gradually in a direction from the first through-hole <NUM> to the second through-hole <NUM>.

In a direction around the first axis P, diameters of the first through-hole <NUM> and the second through-hole <NUM> may be identical to the width of the second groove <NUM>, so as to reduce the perforation area of the second groove <NUM>, and make the current collection component <NUM> stronger and less prone to break off. The width of the second groove <NUM> may be greater than the diameters of the first through-hole <NUM> and the second through-hole <NUM> instead, so as to increase the diffusion speed of the electrolytic solution.

The second groove <NUM> may be arranged corresponding to the first groove <NUM> to increase the diffusion speed of the electrolytic solution. For example, based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals, the second through-holes <NUM> are arranged corresponding to the first through-holes <NUM>, four first grooves <NUM> are provided, and each first groove <NUM> communicates with the corresponding first through-hole <NUM> and second through-hole <NUM>", four second grooves <NUM> are also provided. On the plane perpendicular to the first axis P, the projection of the first groove <NUM> coincides with the projection of the corresponding second groove <NUM>.

The second groove <NUM> may be provided independently from the first groove <NUM> to simplify the assembling and positioning requirements of the current collection component <NUM> and the insulator <NUM>. For example, on the plane perpendicular to the first axis P, the projection of the first groove <NUM> partly coincides with the projection of the corresponding second groove <NUM>. For another example, as shown in <FIG>, no first groove <NUM> is made on the first surface <NUM> of the current collection component <NUM>, and the first through-hole <NUM> communicates with the corresponding second through-hole <NUM> through only one second groove <NUM>.

In the above form of structure, the electrolytic solution flowing out of the first through-hole <NUM> enters the clearance between the insulator <NUM> and the current collection component <NUM>. The second groove <NUM> can guide the electrolytic solution to flow from the first through-hole <NUM> to the second through-hole <NUM> and to enter the electrode assembly <NUM>, and can increase the space of the current collection component <NUM> at a side away from the electrode assembly <NUM>, thereby increasing the diffusion speed of the electrolytic solution.

In some embodiments of this application, the second groove <NUM> extends to an outer peripheral surface of the insulator <NUM> along the radial direction of the electrode assembly <NUM>.

Specifically, the outer peripheral surface of the insulator <NUM> around the first axis P is a second outer peripheral surface <NUM>. The second groove <NUM> may extend along the first direction R, or extend helically around the first axis P, or extend along other directions.

Based on the implementation of "the four first through-holes <NUM> are arranged around the center portion <NUM> at equal intervals, and the second through-holes <NUM> are arranged corresponding to the first through-holes <NUM>", the first through-holes <NUM> and the corresponding second through-holes <NUM> are arranged at intervals along the first direction R. Four second grooves <NUM> are provided. Each second groove <NUM> extends to the second outer peripheral surface <NUM> along the first direction R to communicate with the first through-hole <NUM> and the corresponding second through-hole <NUM>.

In the above form of structure, the second groove <NUM> extends to the outer peripheral surface of the insulator <NUM>, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly <NUM> and the shell <NUM>. In this way, the electrolytic solution fills in the shell <NUM> quickly to infiltrate the electrode assembly <NUM> sufficiently.

<FIG> is a schematic structural diagram of a fourth form of current collection component of a battery cell according to some embodiments of this application, and <FIG> is a schematic structural diagram of how a guide channel of the current collection component shown in <FIG> fits with a center hole.

As shown in <FIG>, in some embodiments of this application, the guide channel is a third groove <NUM>. The third groove <NUM> is made on a side of the periphery portion <NUM>, the side being oriented toward the electrode assembly <NUM>. The third groove <NUM> communicates with the center hole <NUM>.

Specifically, a third groove <NUM> is made on the second surface <NUM> of the current collection component <NUM>. One end of the third groove <NUM> extends to the center portion <NUM> to communicate with the center hole <NUM>, and the other end of the third groove may extend to the edge of the current collection component <NUM>, or extend to the periphery portion <NUM>. Based on the implementation of "the center portion <NUM> protrudes beyond the periphery portion <NUM> toward the electrode terminal <NUM>", one end of the third groove <NUM> communicates with the electrolyte storage space <NUM> to implement communication with the center hole <NUM>.

The third groove <NUM> may be formed by a stamping process, or may be formed by a planing and milling process. The third groove <NUM> may extend along the first direction R, or extend helically around the first axis P, or extend along other directions.

A depth of the third groove <NUM> may be uniform along the extension direction of the third groove, so as to simplify the shape of the third groove <NUM> and make it easy to process and form the current collection component <NUM>. The depth of the third groove <NUM> may vary instead along the extension direction of the third groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the depth of the third groove <NUM> increases gradually in a direction from the center portion <NUM> to the periphery portion <NUM>. A width of the third groove <NUM> may be uniform, so as to simplify the shape of the third groove <NUM> and make it easy to process and form the current collection component <NUM>. The width of the third groove <NUM> may vary instead along the extension direction of the third groove <NUM>, so as to guide rapid diffusion of the electrolytic solution. For example, the width of the third groove <NUM> increases gradually in a direction from the center portion <NUM> to the periphery portion <NUM>.

One third groove <NUM> may be provided alone. All the electrolytic solution is diffused from the center portion <NUM> to the periphery portion <NUM> through one third groove <NUM>. Alternatively, a plurality of third grooves <NUM> may be provided, and the plurality of third grooves <NUM> are distributed at intervals around the first axis P circumferentially. The electrolytic solution enters the plurality of third grooves <NUM>. The plurality of third grooves <NUM> jointly guide the electrolytic solution to diffuse from the center portion <NUM> to the periphery portion <NUM>, so as to evenly infiltrate the electrode assembly <NUM> circumferentially.

In the above form of structure, the electrolytic solution in the center hole <NUM> enters the clearance between the electrode assembly <NUM> and the current collection component <NUM>. The third groove <NUM> can guide the electrolytic solution to diffuse to the peripheral portion <NUM>, thereby increasing the diffusion speed of the electrolytic solution.

In some embodiments of this application, the third groove <NUM> extends to an outer peripheral surface of the periphery portion <NUM> along a radial direction of the electrode assembly <NUM>.

The third groove <NUM> may extend along the first direction R, or extend helically around the first axis P, or extend along other directions. Based on the implementation of "a plurality of third grooves <NUM> are distributed at intervals around the first axis P circumferentially", one end of each third groove <NUM> communicates with the center hole <NUM>, and the other end of the third groove extends to the first outer peripheral surface <NUM> of the periphery portion <NUM> along the first direction R. Based on the implementation of "one third groove <NUM> may be provided alone", one end of the third groove <NUM> communicates with the center hole <NUM>, and the other end of the third groove helically extends around the first axis P to the first outer peripheral surface <NUM> of the periphery portion <NUM>.

In the above form of structure, the third groove <NUM> extends to the outer peripheral surface of the periphery portion <NUM>, and can guide excess electrolytic solution to flow into the clearance between the electrode assembly <NUM> and the shell <NUM>. In this way, the electrolytic solution fills in the shell <NUM> quickly to infiltrate the electrode assembly <NUM> sufficiently.

Some embodiments of this application disclose a battery <NUM>, including the battery cell <NUM>.

Some embodiments of this application disclose an electrical device, including the battery <NUM>.

<FIG> is a schematic diagram of a method for manufacturing a battery cell according to some embodiments of this application.

As shown in <FIG>, some embodiments of this application disclose a method for manufacturing a battery cell <NUM>. The method includes the following steps:.

<FIG> is a schematic diagram of equipment for manufacturing a battery cell according to some embodiments of this application.

As shown in <FIG>, some embodiments of this application disclose a piece of equipment <NUM> for manufacturing a battery cell <NUM>, including:.

As shown in <FIG>, <FIG>, <FIG>, some embodiments of this application disclose a cylindrical battery, including a housing <NUM>, an end cap <NUM>, an electrode assembly <NUM>, an electrode terminal <NUM>, a positive current collection plate, a rivet, and a lower plastic sheet. An injection port <NUM> is made on the end cap <NUM>. The injection port <NUM> is sealed by using a rivet. The electrode assembly <NUM> includes a positive tab and a negative tab. The positive tab is connected to a bottom wall <NUM> of the housing <NUM> by the positive current collection plate. The lower plastic sheet dielectrically insulates the positive current collection plate from the bottom wall <NUM>. The negative tab contacts the end cap <NUM> through the negative current collection plate. The center of the positive current collection plate protrudes toward the bottom wall <NUM> to form a center portion <NUM>. A periphery portion <NUM> is disposed around the center portion <NUM> circumferentially. A first through-hole <NUM> is made in the protruding sidewall. A surface of the periphery portion <NUM>, located on the same side as the first through-hole <NUM>, is recessed to form a first groove <NUM>. The first groove <NUM> extends along a radial direction of the positive current collection plate. A second through-hole <NUM> is formed inside the radially extending first groove <NUM>. The second through-hole <NUM> is configured to divert an electrolytic solution. During electrolyte injection, the injection port <NUM> of the cylindrical battery is located at the bottom. The electrolytic solution flows upward from a center hole <NUM> of the electrode assembly <NUM>, enters the first groove <NUM> through the first through-hole <NUM> in the positive current collection plate, diffuses radially, flows to a clearance between the housing <NUM> and the electrode assembly <NUM>, and enters the electrode assembly <NUM> through the second through-hole <NUM>, thereby improving the infiltration effect of the electrolytic solution of the entire cylindrical battery.

A hollowed-out length of the protruding sidewall of the positive current collection plate exceeds <NUM>/<NUM> of a circumference thereof, so as to function as a fuse. A groove of the positive current collection plate, oriented toward the bottom wall <NUM>, communicates with the first through-hole <NUM> to guide the electrolytic solution into the first groove <NUM>. The number of second through-holes <NUM> in each first groove <NUM> may be <NUM>, <NUM>, or the like, and the shape of the second through-hole may be circular, triangular, rectangular, elliptical, or the like.

As shown in <FIG>, <FIG>, <FIG>, some embodiments of this application disclose a cylindrical battery, including a housing <NUM>, an end cap <NUM>, an electrode assembly <NUM>, an electrode terminal <NUM>, a positive current collection plate, a rivet, and a lower plastic sheet. A first through-hole <NUM> and a second through-hole <NUM> are made in a positive current collection plate. A second groove <NUM> is made on a surface of the lower plastic sheet, the surface being oriented toward the positive current collection plate. The second groove <NUM> is in fit with the first through-hole <NUM> and the second through-hole <NUM>. During electrolyte injection, the electrolytic solution enters the second groove <NUM> from the first through-hole <NUM>, diffuses radially, flows to a clearance between the housing <NUM> and the electrode assembly <NUM>, and enters the electrode assembly <NUM> through the second through-hole <NUM>, thereby improving the infiltration effect of the electrolytic solution of the entire cylindrical battery.

The width of the second groove <NUM> and the height of protrusion from the center of the positive current collection plate are identical to the diameter of the second through-hole <NUM>.

As shown in <FIG>, <FIG>, <FIG>, some embodiments of this application disclose a cylindrical battery, including a housing <NUM>, an end cap <NUM>, an electrode assembly <NUM>, an electrode terminal <NUM>, a positive current collection plate, a rivet, and a lower plastic sheet. The positive current collection plate protrudes toward the bottom wall <NUM> to form a center portion <NUM>. A periphery portion <NUM> is disposed around the center portion <NUM>. A third groove <NUM> is made on a surface of the periphery portion <NUM>, the surface being oriented toward the electrode assembly <NUM>. The third groove <NUM> extends along a radial direction of the positive current collection plate. During electrolyte injection, the electrolytic solution flows upward from a center hole <NUM> of the electrode assembly <NUM>, diffuses inside the central protrusion of the positive current collection plate and along a radial direction of the third groove <NUM>, flows to a clearance between the housing <NUM> and the electrode assembly <NUM>, and flows to the electrode assembly <NUM>, thereby improving the infiltration effect of the electrolytic solution of the entire cylindrical battery.

Claim 1:
A battery cell (<NUM>), comprising:
a shell (<NUM>), comprising a first wall;
an electrode terminal (<NUM>), dielectrically mounted on the first wall;
an electrode assembly (<NUM>), accommodated in the shell (<NUM>), wherein the electrode assembly (<NUM>) comprises a center hole (<NUM>), and a first tab (<NUM>) is formed at an end of the electrode assembly (<NUM>), the end being oriented toward the first wall; and
a current collection component (<NUM>), disposed between the first wall and the electrode assembly (<NUM>), wherein the current collection component (<NUM>) comprises a center portion (<NUM>) and a periphery portion (<NUM>), the center portion (<NUM>) positionally corresponds to the center hole (<NUM>), the center portion (<NUM>) is configured to be connected to the electrode terminal (<NUM>), and the periphery portion (<NUM>) is configured to be connected to the first tab (<NUM>); and
a guide channel is disposed on the current collection component (<NUM>), and the guide channel is configured to guide an electrolytic solution in the center hole (<NUM>) to diffuse from the center portion (<NUM>) to the periphery portion (<NUM>), wherein
the guide channel is a first through-hole (<NUM>), and the first through-hole (<NUM>) is located at an edge of the center portion (<NUM>),characterized by
a second through-hole (<NUM>) is made on the periphery portion (<NUM>), and the second through-hole (<NUM>) is farther away from the center portion (<NUM>) than the first through-hole (<NUM>), and
a first groove (<NUM>) is made on a side of the periphery portion (<NUM>), the side being away from the electrode assembly (<NUM>); and the first groove (<NUM>) is configured to communicate with the first through-hole (<NUM>) and the second through-hole (<NUM>),
and/or
an insulator (<NUM>), disposed between the current collection component (<NUM>) and the first wall, and configured to dielectrically insulate the current collection component (<NUM>) from the first wall; wherein a second groove is made on a side of the insulator (<NUM>), the side being oriented toward the current collection component (<NUM>); and the second groove is configured to communicate with the first through-hole (<NUM>) and the second through-hole (<NUM>).