CN220569871U

CN220569871U - Battery monomer, battery and electric equipment

Info

Publication number: CN220569871U
Application number: CN202321978865.6U
Authority: CN
Inventors: 林蹬华; 杨道伟; 黄守君; 郑于炼; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-07-27
Filing date: 2023-07-26
Publication date: 2024-03-08
Anticipated expiration: 2033-07-26
Also published as: CN117941158A; WO2024020847A1

Abstract

The embodiment of the application provides a battery monomer, a battery and electric equipment. The battery cell includes: a case, a first wall of which is provided with an electrode terminal; an electrode assembly accommodated in the case, the electrode assembly including a tab; and a connection member including a first region for electrically connecting with the electrode terminal and a plurality of second regions for electrically connecting with the tab. According to the battery monomer, the battery and the electric equipment, the connection strength between the connecting component and the lug can be improved, and further the performance and the safety of the battery monomer are improved.

Description

Battery monomer, battery and electric equipment

This application claims priority from PCT application PCT/CN2022/108208 entitled "battery cell, battery and consumer" filed on the chinese patent office on month 07, 2022, and 27, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry. In this case, the electric vehicle is an important component for sustainable development of the automobile industry due to the advantage of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor for development.

With the development of battery technology, how to improve the production and processing efficiency of batteries has become a particularly important problem in the development of battery technology.

Disclosure of Invention

The embodiment of the application provides a battery monomer, battery and consumer, can improve the joint strength between connecting element and the utmost point ear, and then improves battery monomer's performance and security.

In a first aspect, there is provided a battery cell comprising: a case, a first wall of which is provided with an electrode terminal; an electrode assembly accommodated in the case, the electrode assembly including a tab; and a connection member including a first region for electrically connecting with the electrode terminal and a plurality of second regions for electrically connecting with the tab.

Therefore, the battery cell of the embodiment of the application comprises the connecting member, wherein the connecting member can comprise one or more first areas and a plurality of second areas, so that the connection strength between the connecting member and the tab can be improved, and the stability of the battery cell is further ensured; and the plurality of second areas can enable current distribution between the connecting member and the tab to be more uniform, so that the temperature rise of the connecting member can be reduced.

In some embodiments, the first region and the plurality of second regions do not overlap, the first region being located between two second regions of the plurality of second regions. The first region and the plurality of second regions are not overlapped, so that the mutual influence of the connection between the connecting member and the tab and the connection between the connecting member and the electrode terminal can be reduced, and the stability of the battery cell can be improved. In addition, the first area of the connecting member is located between two second areas of the plurality of second areas, that is, at least one first area of the connecting member is located between two second areas, so that the positions of the second areas can be flexibly set under the condition that the size of the connecting member is limited, the area of the second areas can be increased as much as possible, that is, the area of the connecting area between the connecting member and the tab can be increased, and the connection strength between the connecting member and the tab can be improved, so that the stability and safety of the battery cell can be ensured.

In some embodiments, the minimum distance between the first region and the second region is greater than or equal to 0.5mm, so that the first region and the second region can be prevented from being affected by assembly tolerance or welding width, that is, the welding between the connection member and the electrode terminal can be prevented from affecting the connection between the connection member and the tab, thereby resulting in insufficient local strength of the connection member and affecting the stability of the battery cell.

In some embodiments, the second area has a circumference greater than or equal to 8mm, so that the problem of insufficient local strength due to the too small connection area between the connection member and the tab can be avoided, and the problem of too high local resistance can be avoided.

In some embodiments, the area of the second region has a value in the range of 0.16mm ² ，240mm ² ]. If the area of the second area is too large, each second area occupies a larger area of the connecting member, and thus the area of the first area is reduced, and the connection strength between the connecting member and the electrode terminal is reduced. Conversely, if the area of the second region is too small, the connection strength between the connection member and the tab is affected, and the overcurrent area of the battery cell is reduced.

In some embodiments, the area S of the second region satisfies: the value range of S/L is [0.8mm,5mm ], and/or the value range of S/W1 is [0.8mm,8mm ]; wherein L represents a dimension of the second region in a length direction of the second region, and W1 represents a dimension of the second region in a width direction of the second region.

If the S/L is too small, the area of the second region will be too small in the length direction of the second region of the connection member under the condition that the dimension L of the second region is fixed, so that the connection strength between the connection member and the tab will be reduced, and the overcurrent area of the battery cell will be reduced, thereby affecting the safety and stability of the battery cell. Conversely, if the S/L is too large, in the length direction of the second region of the connection member, if the dimension L of the second region is fixed, the area S of the second region may be too large, or the dimension W1 of the second region along the width direction thereof may be too large, which further results in the volume of the connection member being too large, affecting the space utilization inside the battery cell, and further reducing the energy density of the battery cell.

If the S/W1 is too small, the area S of the second area will be too small under the condition that the dimension W1 of the second area in the width direction is fixed, so that the connection strength between the connection member and the tab is reduced, the overcurrent area of the battery is also reduced, and the safety and stability of the battery are further affected. Conversely, if S/W1 is too large, the area S of the second region may be too large, or the dimension L of the second region along the length direction may also be too large, which further results in an excessively large volume of the connection member, affecting the space utilization inside the battery cell, and further reducing the energy density of the battery cell.

In some embodiments, the connecting member includes two of the first regions and two of the second regions, both of the first regions being located between the two of the second regions; alternatively, the connecting member includes two of the first regions and three of the second regions, one of the two first regions being disposed between each adjacent two of the three second regions.

The area of the connecting area between the connecting member and the electrode terminal can be increased to ensure the connecting strength between the connecting member and the electrode terminal, and the area of the connecting area between the connecting member and the electrode tab can be increased to ensure the connecting strength between the connecting member and the electrode terminal. In addition, the first area and the second area are uniformly distributed on the connecting member, so that the temperature of the connecting member is uniformly distributed, and the influence on the safety of the battery cell due to overhigh temperature of the local area is avoided; the first area and the second area can be mutually unaffected, and stability of the battery monomer is guaranteed.

In some embodiments, the connecting member is a sheet-like structure to save space.

In some embodiments, the housing comprises: a housing having a hollow structure with an opening; and the cover plate is used for covering the opening. The structure inside the battery cell can be installed through the opening, and then the cover plate covers the opening of the shell, so that the shell forms a closed hollow structure, and the internal environment and the external environment of the battery cell are isolated.

In some embodiments, the cover is the wall of the cell that has the greatest area. Correspondingly, the area of the opening of the shell is larger, so that the assembly of components inside the shell is facilitated, for example, the electrode assembly is conveniently and rapidly installed in the shell, and the installation efficiency of the battery cell is improved.

In some embodiments, the cap plate is provided with at least one electrode terminal for the first wall, i.e., the cap plate, to facilitate installation.

In some embodiments, the electrode terminal is located in a region near the first edge of the cap plate. Since the electrode terminals are generally protruded from the surface of the cap plate, it is generally necessary to consider avoiding the region where the electrode terminals are located when assembling a plurality of battery cells. Therefore, the electrode terminal is disposed in the peripheral region of the first side, so that the electrode terminal is more convenient to avoid and is also convenient to electrically connect a plurality of battery cells than the electrode terminal is disposed in the central region of the cover plate. In addition, the electrode terminal is arranged in the surrounding area of the first side, so that the electrode terminal and the corresponding tab can be electrically connected.

In some embodiments, the first edge is the edge of the cover plate having the smallest length. Considering that each electrode terminal occupies a smaller area of the cover plate, the electrode terminals are arranged in the area close to the shortest side, so that the space occupied by the electrode terminals, the connecting members and the lugs can be reduced as much as possible, and the space utilization rate of the battery cell is improved.

In some embodiments, a plurality of electrode terminals are disposed near the first edge, and the plurality of electrode terminals are electrically connected to the tab through the same connection member. By providing a plurality of electrode terminals electrically connected to the same connecting member, the area of the connection region between the positive electrode terminal and the connecting member or between the negative electrode terminal and the connecting member can be increased, and the overcurrent area can be increased, as compared with the case where only one electrode terminal is electrically connected to the connecting member.

In some embodiments, a minimum distance between the electrode terminal and a second edge is greater than a minimum distance between the electrode terminal and the first edge, the second edge intersecting the first edge. That is, the electrode terminals are closer to the first side, and particularly when the cover plate is provided with a plurality of electrode terminals, the plurality of electrode terminals are all close to the first side, and the plurality of electrode terminals are relatively more concentrated, so that the space occupied by the electrode terminals, the connecting members and the electrode lugs can be reduced as much as possible, and the space utilization rate of the battery cell can be improved.

In some embodiments, all of the electrode terminals disposed near the region of the first side are symmetrically distributed with respect to a central axis perpendicular to the first side.

The electrode terminals are relatively uniformly arranged in the area close to the first edge, so that electric connection between different battery cells is facilitated, for example, electric connection of a plurality of battery cells can be realized without a bus bar component with too complex shape. In addition, in consideration of the fact that the temperature of the area where the electrode terminal is located is relatively high in the charging and discharging process of the battery cell, the electrode terminal is relatively uniformly arranged in the area close to the first side, so that the temperature distribution of the first side can be relatively uniform, and the situation that the local area of the first side is overheated and the safety of the battery cell is affected as much as possible is avoided.

In some embodiments, the battery cell includes a positive electrode terminal and a negative electrode terminal at both ends of the cap plate in a length direction, so that the positive electrode terminal and the negative electrode terminal are far apart from each other to avoid a short circuit due to mutual influence.

In some embodiments, the case includes a recess provided in correspondence with the electrode terminal, the recess being recessed from a bottom wall of the case toward the opening, the recess being for accommodating the electrode terminal of the battery cell adjacent to the bottom wall.

In consideration of the fact that the electrode terminals are generally protruded from the outer surface of the cover plate, in order to save space, when a plurality of battery cells are stacked in the thickness direction, the electrode terminals are accommodated in the concave portions of the adjacent battery cells, the distance between the adjacent battery cells can be reduced, more battery cells can be arranged in the limited space in the box body of the battery, and therefore the energy density and the space utilization rate of the battery are improved.

In some embodiments, the recess extends through the housing in a width direction of the housing. On the one hand, the processing and manufacturing are convenient, on the other hand, when the electrode terminals distributed on the cover plate, especially when a plurality of electrode terminals are distributed along the width direction, the plurality of electrode terminals can be accommodated through the concave parts, and the concave parts are not needed to be arranged for each electrode terminal, so that the assembly efficiency of a plurality of battery cells in the battery is convenient to improve.

In some embodiments, the plurality of second regions are for electrical connection with the same tab of the electrode assembly. Therefore, the current distribution between the connecting member and the tab can be more uniform, and the temperature rise of the connecting member can be reduced.

In a second aspect, there is provided a battery comprising: a plurality of the battery cells of the first aspect.

In some embodiments, a plurality of the battery cells are arranged in a thickness direction of the battery cells.

In a third aspect, there is provided a powered device comprising: the battery cells of the first aspect are configured to provide electrical energy to the powered device.

In some embodiments, the powered device is a vehicle, a vessel, or a spacecraft.

Drawings

FIG. 1 is a schematic illustration of a vehicle according to one embodiment of the present disclosure;

fig. 2 is a schematic view showing an exploded structure of a battery according to an embodiment of the present application;

fig. 3 is a schematic structural view of a battery cell according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of at least a partially exploded construction of a battery cell according to one embodiment of the present disclosure;

FIG. 5 is a schematic view showing a part of the structure of a battery cell according to an embodiment of the present disclosure;

fig. 6 to 14 are enlarged schematic views of several partial structures of battery cells disclosed in embodiments of the present application;

fig. 15 is a schematic view showing a partial sectional structure of a battery cell according to an embodiment of the present application;

fig. 16 to 17 are enlarged schematic views illustrating another several partial structures of the battery cells according to the embodiments of the present application.

In the drawings, the drawings are not drawn to scale.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.

In the present application, the 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, which is not limited by the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the safety of the battery. For example, for a battery cell, it generally includes an electrode assembly, an electrolyte, a case accommodating the electrode assembly and the electrolyte, and a cap plate mounted on the case, on which electrode terminals for inputting or outputting electric power are generally mounted. When the battery cells are assembled, the electrode assembly and the electrode terminals on the cap plate are generally connected indirectly through connection members, that is, the connection members need to be electrically connected to the electrode assembly and the electrode terminals, respectively. In view of the limited space inside the battery cell, the arrangement of the connection members is very limited in order to increase the energy density of the battery cell. Therefore, how to reasonably arrange the connection region between the electrode terminal and the tab on the connection member in a limited space so as to ensure the connection stability between the connection member and the electrode terminal and between the connection member and the tab is a problem to be solved at present.

The embodiment of the application provides a battery monomer, battery and consumer, can solve above-mentioned problem. The first wall of the housing of the battery cell of this application is provided with electrode terminal, and the inside electrode assembly that holds of housing realizes the electricity through connecting element between electrode terminal and the electrode assembly. Specifically, the connection member includes a first region for electrical connection with the electrode terminal and a plurality of second regions for electrical connection with the tab. By arranging a plurality of second areas, the positions of the areas for being electrically connected with the tabs can be more flexibly arranged under the condition that the size of the connecting member is limited, and the area of the connecting area between the connecting member and the tabs is increased as much as possible, so that the connection strength between the connecting member and the tabs is improved, and the stability and the safety of the battery cells are ensured; and the plurality of second areas can enable current distribution between the connecting member and the tab to be more uniform, so that the temperature rise of the connecting member can be reduced.

The technical scheme described in the embodiment of the application is applicable to various electric equipment using batteries.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being arranged to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, e.g. the battery 10 may be used as an operating power source for the vehicle 1, for electrical circuitry of the vehicle 1, e.g. for start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

To meet different power requirements, the battery may include a plurality of battery cells, where the plurality of battery cells may be connected in series or parallel or a series-parallel connection, and the series-parallel connection refers to a mixture of series and parallel connection. The battery may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a battery. That is, a plurality of battery cells may be directly assembled into a battery, or may be assembled into a battery module first, and the battery module may be assembled into a battery.

For example, fig. 2 shows a schematic structural diagram of a battery 10 according to one embodiment of the present application, and the battery 10 may include a plurality of battery cells 20. The battery 10 may further include a case 11, in which the case 11 has a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. Fig. 2 illustrates one possible implementation of the case 11 according to the embodiment of the present application, and as shown in fig. 2, the case 11 may include two parts, which are referred to herein as a first case portion 111 and a second case portion 112, respectively, and the first case portion 111 and the second case portion 112 are fastened together. The shape of the first and second case parts 111 and 112 may be determined according to the combined shape of the battery modules 200, at least one of the first and second case parts 111 and 112 having one opening. For example, as shown in fig. 2, only one of the first case portion 111 and the second case portion 112 may be a hollow rectangular parallelepiped having an opening, and the other may be a plate-like shape to cover the opening. For example, here, the second case portion 112 is a hollow rectangular parallelepiped and only one face is an opening face, and the first case portion 111 is a plate-like shape, and then the first case portion 111 is covered at the opening of the second case portion 112 to form a case 11 having a closed chamber that can be used to house a plurality of battery cells 20. The plurality of battery cells 20 are connected in parallel or in series-parallel, and then are placed in the box 11 formed by buckling the first box 111 and the second box 112.

As another example, unlike fig. 2, the first and second case parts 111 and 112 may each be a hollow rectangular parallelepiped and have only one surface thereof as an open surface, the openings of the first case part 111 and the second case part 112 are disposed opposite to each other, and the first case part 111 and the second case part 112 are fastened to each other to form a case 11 having a closed chamber that may be used to house a plurality of battery cells 20.

In some embodiments, the battery 10 may further include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus bar member 12, where the bus bar member 12 is configured to electrically connect the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member 12 may achieve electrical connection between the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20. Further, the bus member 12 may be fixed to the electrode terminals 214 of the battery cells 20 by welding. The electric power of the plurality of battery cells 20 may be further led out through the case 11 by the conductive mechanism.

Fig. 3 shows a schematic structural view of the battery cell 20 according to the embodiment of the present application, and fig. 4 shows a schematic structural view of at least part of the battery cell 20 according to the embodiment of the present application. For example, the battery cell 20 in fig. 4 may be the battery cell 20 shown in fig. 3, and the battery cell 20 shown in fig. 3 and 4 may be any one of the battery cells 20 included in the battery 10 shown in fig. 2. Fig. 5 shows a partial schematic structural view of the battery cell 20 of the embodiment of the present application, for example, in order to more clearly show the internal structure of the battery cell 20, the battery cell 20 shown in fig. 5 does not include at least the case 211 of the battery cell 20, and fig. 5 shows only a partial schematic structural view of the battery cell 20 provided with the electrode terminal 214. Fig. 6 shows a partial structure enlarged view of the battery cell 20 according to the embodiment of the present application, for example, fig. 6 may be a partial structure enlarged view of the battery cell 20 shown in fig. 5.

Specifically, as shown in fig. 3 to 6, the battery cell 20 of the embodiment of the present application includes: a case 21, a first wall 213 of the case 21 being provided with an electrode terminal 214; an electrode assembly 22 accommodated in the case 21, the electrode assembly 22 including a tab 222; a connection member 23, the connection member 23 including a first region 231 for electrically connecting with the electrode terminal 214 and a plurality of second regions 232 for electrically connecting with the tab 222.

It should be appreciated that the battery cell 20 of the embodiment of the present application may be provided in any polyhedral structure according to practical applications. For example, the battery cell 20 may be a rectangular parallelepiped or a cylindrical body. The housing 21 of the polyhedral battery cell 20 includes a plurality of walls, wherein the first wall 213 may be any one of the plurality of walls.

The battery cell 20 of the embodiment of the present application may include a plurality of electrode terminals 214, and the plurality of electrode terminals 214 may be located at the same wall or different walls of the case 21, for example, fig. 3 to 6 take the case that the battery cell 20 includes four electrode terminals 214 and the four electrode terminals 214 are located at the same wall, but the embodiment of the present application is not limited thereto. For convenience of description, the embodiment of the present application mainly takes any one electrode terminal 214 among the plurality of electrode terminals 214 as an example, and a wall where the electrode terminal 214 is located is the first wall 213.

The connection member 23 of the present embodiment is used to achieve electrical connection between the electrode terminal 214 and the corresponding tab 222. Specifically, the connection member 23 comprises at least one first region 231, i.e. the connection member 23 may comprise one first region 231 or at least two first regions 231 arranged at intervals. Each of the first regions 231 is for electrical connection with the electrode terminal 214, and for example, electrical connection between the connection member 23 and the electrode terminal 214 may be achieved by soldering at the first region 231. In addition, the connection member 23 further includes a plurality of second regions 232, that is, the connection member 23 includes at least two second regions 232 disposed at intervals, wherein each second region 232 is used for electrically connecting with the tab 222, for example, the electrical connection between the connection member 23 and the tab 222 may be achieved by welding at the second region 232. In this way, the position of the region for electrically connecting with the tab 222 can be more flexibly set under the condition that the size of the connecting member 23 is limited, the area of the connecting region between the connecting member 23 and the tab 222 is increased as much as possible, the connection strength between the connecting member 23 and the tab 222 can be ensured, and the stability of the battery cell 20 is further ensured; and the plurality of second regions 232 may make the current distribution between the connection member 23 and the tab 222 more uniform, and thus may reduce the temperature rise of the connection member 23.

The housing 21 of the present embodiment may be a hollow polyhedral structure. Specifically, the case 21 may include a housing 211 and a cover plate 212, wherein the housing 211 may be a hollow structure having at least one end forming an opening 2111, and the cover plate 212 may be shaped to fit the shape of the housing 211, and the cover plate 212 is adapted to cover the opening 2111 of the housing 211 such that the case 21 insulates the internal environment of the battery cell 20 from the external environment. If the housing 211 has a hollow structure with an opening 2111 formed at one end, the cover 212 may be provided as one, for example, as shown in fig. 3 and 3; alternatively, if the housing 211 may have a hollow structure with openings 2111 formed at opposite ends, two cover plates 212 may be provided, and the two cover plates 212 may cover the openings 2111 at the opposite ends of the housing 211, which is not limited to this embodiment.

The material of the housing 211 according to the embodiment of the present application may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover 212 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover 212 may be the same as or different from the material of the housing 211.

The housing 21 of the embodiment of the present application may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The housing 211 and the cover plate 212 are matched in shape, for example, as shown in fig. 3 and 4, the housing 211 may be a rectangular parallelepiped structure, and the cover plate 212 is a rectangular plate structure matched with the housing 211. For convenience of explanation, the case 21 is exemplified as a rectangular parallelepiped in this application.

Specifically, as shown in fig. 3 and 4, the housing 21 includes: a housing 211, the housing 211 being a hollow structure having an opening 2111; a cover plate 212, the cover plate 212 is used for covering the opening 2111. In this way, the structure inside the battery cell 20 can be mounted through the opening 2111, and then the cover 212 is covered on the opening 2111 of the housing 211, so that the housing 21 forms a closed hollow structure, and the internal environment of the battery cell 20 is isolated from the external environment.

In this embodiment, as shown in fig. 3 and 4, the cover 212 is the wall with the largest area of the battery cell, so that the opening 2111 of the housing 211 is larger, which is convenient for assembling the components inside the housing 211, for example, for quickly mounting the electrode assembly 22 in the housing 211, and improving the mounting efficiency of the battery cell 20.

In the embodiment of the present application, as shown in fig. 3 and 4, the case 21 serves to accommodate the electrode assembly 22. The electrode assembly 22 of the embodiment of the present application is a component in which electrochemical reactions occur in the battery cell 20. In the battery cell 20, the number of the electrode assemblies 22 in the case 211 may be 1 or more according to the actual use requirements. The electrode assembly 22 may be a cylinder, a rectangular parallelepiped, or the like. For example, if the electrode assembly 22 has a cylindrical structure, the case 211 may have a cylindrical structure, and if the electrode assembly 22 has a rectangular parallelepiped structure, the case 211 may have a rectangular parallelepiped structure. For example, the present embodiment is mainly described by taking an example in which the battery cell 20 includes an approximately rectangular parallelepiped electrode assembly 22.

For any one of the electrode assemblies 22, the electrode assembly 22 may include a tab 222 and a body portion 221. Specifically, as shown in fig. 3 and 4, the electrode assembly 22 may include at least two tabs 222, and the at least two tabs 222 may include at least one positive tab 222a and at least one negative tab 222b. The positive electrode tab 222a may be formed by laminating a portion of the positive electrode sheet where the positive electrode active material layer is not coated, and the negative electrode tab 222b may be formed by laminating a portion of the negative electrode sheet where the negative electrode active material layer is not coated. The main body portion 221 of the electrode assembly 22 may be formed by laminating or winding a portion coated with a positive electrode active material layer on a positive electrode tab and a portion coated with a negative electrode active material layer on a negative electrode tab.

In the present embodiment, the different tabs 222 of the electrode assembly 22 may be located at the same end face or different end faces. For example, as shown in fig. 3 and 4, the embodiment of the present application will be mainly described by taking an example in which two tabs 222 of the electrode assembly 22 are respectively located at opposite ends, but the embodiment of the present application is not limited thereto.

The casing 21 of the embodiment of the present application is further provided with an electrode terminal 214, and the electrode terminal 214 is electrically connected to the electrode assembly 22 to output the electric energy of the battery cell 20. For example, as shown in fig. 3 and 4, the battery cell 20 may further include at least two electrode terminals 214, and the at least two electrode terminals 214 may be disposed on the same wall or different walls of the battery cell 20. Specifically, the at least two electrode terminals 214 respectively include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, wherein the positive electrode terminals 214a are electrically connected with the positive electrode tabs 222a, for example, each positive electrode terminal 214a may be electrically connected with at least one positive electrode tab 222 a; the negative electrode terminals 214b are electrically connected with the negative tabs 222b, for example, each negative electrode terminal 214b may be electrically connected with at least one negative tab 222b.

In the embodiment of the present application, the plurality of electrode terminals 214 included in the battery cell 20 may be located at the same wall or different walls. For example, the plurality of electrode terminals 214 may be located at the first wall 213; alternatively, the plurality of electrode terminals 214 may be respectively located at two walls of the battery cell 20 disposed opposite to each other, and the embodiment of the present application is not limited thereto.

As shown in fig. 3 and 4, the cap plate 212 is a first wall 213, i.e., the cap plate 212 is provided with at least one electrode terminal 214 for easy installation. For example, the cap plate 212 may include all the electrode terminals 214 of the battery cells 20 for easy installation and processing, for example, if the cap plate 212 has a large area, all the electrode terminals 214 may be disposed on the cap plate 212 to improve processing efficiency. For another example, the cap plate 212 may be provided with a portion of the electrode terminal 214, and the other wall opposite to the cap plate 212 may be provided with another electrode terminal 214. For convenience of description, any one of the electrode terminals 214 provided on the cap plate 212 will be described below as an example.

As shown in fig. 3 and 4, the cap plate 212 is generally in the shape of a flat plate, and the electrode terminals 214 are fixed to the flat plate surface of the cap plate 212. For example, the battery cell 20 further includes at least one of the following: the snap 2141, the first insulating structure 2142, the seal 2143, and the second insulating structure 2144 are riveted to achieve fixation between the cap plate 212 and the electrode terminal 214. Specifically, the staking tabs 2141 may be used to secure the electrode terminal 214 to prevent relative movement between the electrode terminal 214 and the cap plate 212. The first insulation structure 2142 and the second insulation structure 2144 may be disposed on both sides of the cap plate 212, respectively, to achieve electrical insulation between the electrode terminal 214 and the cap plate 212, thereby avoiding a short circuit. The sealing member 2141 may serve to achieve sealing between the electrode terminal 214 and the cap plate 212, preventing electrolyte inside the case 211 from leaking along a gap between the electrode terminal 214 and the cap plate 212.

It should be appreciated that as shown in fig. 3 to 6, the electrode terminal 214 is located near the first edge 2121 of the cap plate 212, wherein the first edge 2121 may be any one edge of the cap plate 212. Since the electrode terminals 214 are generally protruded from the surface of the cap plate 212, it is generally necessary to consider the area where the electrode terminals 214 are located when assembling a plurality of battery cells 20. Therefore, the electrode terminal 214 is provided in the peripheral region of the first side 2121, which facilitates avoidance and electrical connection between the plurality of battery cells 20, as compared to the central region of the cap plate 212. Further, the electrode terminal 214 is provided in the peripheral region of the first side 2121, so that the electrode terminal 214 and the corresponding tab 222 can be electrically connected.

In the embodiment of the present application, the first edge 2121 is the edge with the smallest length of the cover plate 212. Considering that each electrode terminal 214 occupies a small area of the cap plate 212, the electrode terminals 214 are disposed in an area near the shortest side, so that the space occupied by the electrode terminals 214, the connection members 23, and the tabs 222 can be reduced as much as possible, and the space utilization of the battery cell 20 can be improved.

In the embodiment of the present application, as shown in fig. 3 to 6, a plurality of electrode terminals 214 are provided near the region of the first edge 2121, and the plurality of electrode terminals 214 are electrically connected to the tab 222 through the same connection member 23. For example, the plurality of electrode terminals 214 may be positive electrode terminals 214a, and then the plurality of positive electrode terminals 214a are all close to the first side 2121 and may be electrically connected to the positive electrode tab 222a through the same connection member 23. For another example, the plurality of electrode terminals 214 may be negative electrode terminals 214b, and the plurality of negative electrode terminals 214b may be disposed near the first side 2121 and may be electrically connected to the negative electrode tab 222b via the same connection member 23. By providing a plurality of electrode terminals 214 electrically connected to the same connecting member 23, the area of the connection region between the positive electrode terminal 214a and the connecting member 23 or between the negative electrode terminal 214b and the connecting member 23 can be increased, and the overcurrent area can be increased, as compared with the case where only one electrode terminal 214 is electrically connected to the connecting member 23.

As shown in fig. 3 to 6, the minimum distance D2 between the electrode terminal 214 and the second side 2122 is greater than the minimum distance D1 between the electrode terminal 214 and the first side 2121, and the second side 2122 intersects the first side 2121. In this embodiment, the minimum distance D2 between the electrode terminal 214 and the second side 2122 refers to the minimum value of the distances from different regions of the electrode terminal 214 to the second side 2122, or D2 refers to the linear distance from the closest point of the electrode terminal 214 to the second side 2122. Similarly, the minimum distance D1 between the electrode terminal 214 and the first side 2121 refers to the minimum value of the distances from different regions of the electrode terminal 214 to the first side 2121, or D1 refers to the linear distance from the closest point of the electrode terminal 214 to the first side 2121. Setting the distance D1 to be smaller than D2 may enable the electrode terminal 214 to be closer to the first edge 2121, especially when the cover plate 212 is provided with a plurality of electrode terminals 214, the plurality of electrode terminals 214 are all closer to the first edge 2121, and the plurality of electrode terminals 214 are relatively more concentrated, so that the space occupied by the electrode terminals 214, the connecting members 23 and the tabs 222 can be reduced as much as possible, and the space utilization of the battery cell 20 can be improved.

It should be understood that the minimum distance D2 between the electrode terminal 214 and the second side 2122 and the minimum distance D1 between the electrode terminal 214 and the first side 2121 may be set according to practical applications. For example, the distances D1 and D2 may be set appropriately according to the number of the electrode terminals 214 near the first edge 2121. For example, the range of the distance D1 may be set to 3mm or more, or may be set to [5mm,10mm ]. For another example, the range of the distance D2 may be set to be greater than or equal to 3mm, wherein the distance D2 is relatively smaller when the number of the electrode terminals 214 near the first side 2121 is greater, and the distance D2 is relatively larger when the number of the electrode terminals 214 near the first side 2121 is smaller.

In the embodiment of the present application, as illustrated in fig. 3 to 6, all the electrode terminals 214 disposed near the region of the first side 2121 are symmetrically distributed with respect to the central axis 2121a perpendicular to the first side 2121. The electrode terminals 214 are relatively uniformly disposed in the region near the first edge 2121 so as to facilitate electrical connection between the different battery cells 20, for example, electrical connection of the plurality of battery cells 20 can be achieved without the bus bar member 12 having a too complex shape. In addition, considering that the temperature of the area where the electrode terminal 214 is located is relatively high during the charge and discharge of the battery cell 20, the electrode terminal 214 is relatively uniformly disposed in the area near the first edge 2121, so that the temperature distribution of the first edge 2121 is relatively uniform, and the local area of the first edge 2121 is prevented from being overheated as much as possible, which affects the safety of the battery cell 20.

As described in fig. 3 to 6, the battery cell 20 includes a positive electrode terminal 214a and a negative electrode terminal 214b, and the positive electrode terminal 214a and the negative electrode terminal 214b are located at both ends of the cap plate 212 in the length direction X. Specifically, the battery cell 20 may include one or more positive electrode terminals 214a, and one or more negative electrode terminals 214b, and the positive electrode terminals 214a and the negative electrode terminals 214b may each be located at the cap plate 212 for easy processing. For example, the positive electrode terminal 214a and the negative electrode terminal 214b may be located at two ends of the cover plate 212 in the length direction X, wherein, since the cover plate 212 has a flat plate structure, the length direction X of the cover plate 212 is perpendicular to the shortest side of the cover plate 212, so that the positive electrode terminal 214a and the negative electrode terminal 214b are far apart from each other, and short circuit caused by mutual influence is avoided.

It should be understood that the length direction X of the cover 212 in the embodiment of the present application coincides with the length direction X of the housing 211 and also coincides with the length direction of the battery cell 20.

It is to be understood that, as described in fig. 3 to 6, the case 211 includes the recess 2113, the recess 2113 being provided corresponding to the electrode terminal 214, the recess 2113 being recessed from the bottom wall 2112 of the case 211 toward the opening 2111, the recess 2113 being for accommodating the electrode terminal 214 of the battery cell adjacent to the bottom wall 2112. Specifically, the battery 10 may include a plurality of battery cells 20, and the plurality of battery cells 20 may be arranged along a thickness direction Z of the battery cell 20, wherein if the cover 212 is a wall of the battery cell 20 having the largest area, the thickness direction Z is perpendicular to the cover 212 of the battery cell 20. Considering that the electrode terminals 214 are generally protruded from the outer surface of the cap plate 212, when a plurality of battery cells 20 are stacked in the thickness direction Y, the electrode terminals 214 are received in the recesses 2113 of the adjacent battery cells 20, so that the distance between the adjacent battery cells 20 can be reduced, more battery cells 20 can be disposed in the limited space in the case 11 of the battery 10, and thus the energy density and space utilization of the battery 10 can be improved.

It should be understood that the thickness direction Z of the battery cell 20 in the embodiment of the present application is perpendicular to the wall of the case 21 where the area is largest. For example, if the cover 212 is a wall having the largest area of the battery cells 20, the thickness direction Z of the battery cells 20 coincides with the thickness direction Z of the cover 212 and also coincides with the thickness direction Z of the case 211. The thickness direction Z is perpendicular to the longitudinal direction X.

It is understood that the specific position and size of the recess 2113 may be set according to the distribution position of the electrode terminals 214. For example, if the electrode terminal 214 is near a corner where the first edge 2121 and the second edge 2122 of the cap plate 212 intersect, the recess 2113 may be correspondingly located at a corner of the case 211 to accommodate the electrode terminal 214 of the adjacent battery cell 20.

As another example, as shown in fig. 3 to 6, the recess 2113 penetrates the housing 211 in the width direction Y of the housing 211. In this way, on the one hand, the processing and manufacturing are facilitated, and on the other hand, when the electrode terminals 214 distributed on the cap plate 212, in particular, the plurality of electrode terminals 214 are distributed in the width direction Y, the plurality of electrode terminals 214 can be accommodated by the recess 2113, without providing the recess 2113 for each electrode terminal 214, so that the assembling efficiency of the plurality of battery cells 20 in the battery 10 is facilitated.

It should be understood that, in the embodiment of the present application, the width direction Y of the case 211 coincides with the width direction Y of the battery cell 20, and also coincides with the width direction Y of the cover plate 212; the width direction Y, the thickness direction Z, and the length direction X are perpendicular to each other.

In the present embodiment, the space occupied by the recess 2113 may be provided in various ways. For example, as shown in fig. 3 to 6, at least a partial region of the tab 222 is used to be connected with the connection member 23, and the at least partial region may be disposed facing the cover plate 212 such that the connection member 23 is located between the cover plate 212 and at least a portion of the tab 222, that is, at least a portion of the tab 222, the connection member 23 and the cover plate 212 are disposed parallel to each other, so as to reduce the space occupied by the three as much as possible. In this way, when the tab 222 and the connection member 23 are both disposed close to the cover 212, a space exists between the side wall of the housing 211 and the end face where the tab 222 is located, and the corresponding region of the bottom wall 2112 of the housing 211 may be disposed to be recessed toward the cover 212, thereby forming the recess 2113. In addition, the battery cell 20 may further include a bracket 25 for supporting the tab 222, and the volume of the bracket 25 may be set according to practical applications, so that a sufficient space is provided between the sidewall of the housing 211 and the end surface of the tab 222 to form the recess 2113.

In the embodiment of the present application, the positive electrode terminal 214a may be electrically connected with the positive electrode tab 222a of the electrode assembly 22 through the connection member 23, for example, as shown in fig. 3 to 6, one or more positive electrode terminals 214a may be electrically connected with the positive electrode tab 222a through the same connection member 23. Similarly, the negative electrode terminal 214b may also be electrically connected to the negative electrode tab 222b by a connection member 23, for example, as shown in fig. 3-6, one or more negative electrode terminals 214b may be electrically connected to the positive electrode tab 222a by the same connection member 23.

It should be understood that the shape of the connection member 23 according to the embodiment of the present application may be set according to practical applications, for example, the connection member 23 is a sheet-like structure to save space. For another example, at least part of the connection member 23 is of a sheet-like structure to provide the connection member 23 in a corresponding shape according to the positions of the electrode terminals 214 and the tabs 222. For convenience of explanation, the present embodiment mainly takes the connecting member 23 of a sheet structure as an example.

Any one of the connection members 23 of the battery cells 20 in the embodiment of the present application will be described in detail with reference to the accompanying drawings.

It should be understood that the positions of the plurality of second areas 232 in the embodiments of the present application may be set according to actual applications; the position of the first area 231 in the embodiment of the present application may also be set according to practical applications, so as to adapt to requirements of different sizes and different application scenarios.

In some embodiments, the first region 231 and the plurality of second regions 232 do not overlap, and the first region 231 is located between two second regions 232 of the plurality of second regions 232. Specifically, the connection member 23 of the embodiment of the present application may include one or more first regions and a plurality of second regions 232, and each of the second regions 232 of the plurality of second regions 232 does not overlap with each of the first regions 231. In this way, in the case of improving the connection strength between the connection member 23 and the electrode terminal 214 and the connection strength between the connection member 23 and the tab 222, the temperature distribution of the connection member 23 can be made uniform, and the possibility that the stability of the battery cell 20 is affected by the excessive temperature in the local area can be reduced; the interaction between the first region 231 and the second region 232 can be reduced, thereby improving the stability of the battery cell 20.

In some embodiments, the first region 231 of the connection member 23 in the embodiments of the present application may be located between two second regions 232 in the plurality of second regions 232, that is, at least one first region 231 in the connection member 23 is located between two second regions 232, so that, under the condition that the size of the connection member 23 is limited, the position of the second region 232 may be set more flexibly, and the size of the second region 232 may be increased as much as possible, that is, the area size of the connection region between the connection member 23 and the tab 222 may be increased, thereby improving the connection strength between the connection member 23 and the tab 222, so as to ensure the stability and safety of the battery cell 20.

It should be appreciated that the positioning of the first region 231 between two second regions 232 of the plurality of second regions 232 in embodiments of the present application may include a variety of situations; and the first region 231 in the embodiment of the present application being located between two second regions 232 among the plurality of second regions 232 means that at least one first region 231 exists among at least one first region 231 included in the connection member 23, which satisfies: each first region 231 of the at least one first region 231 is located between two second regions 232 of the plurality of second regions 232. Specifically, taking fig. 6 as an example, and taking the first direction as an example of the width direction Y of the battery cell 20 as an example, the arrangement direction of any two second regions 232 in the plurality of second regions 232 is the first direction Y, which corresponds to fig. 6 as an example. For any one of the first regions 231, the first region 231 being located between two second regions 232 of the plurality of second regions 232 includes: in the arrangement direction Y of the two second regions 232, for example, taking the first direction Y as an example, at least a part of the first region 231 is located in a region between the two second regions 232, or the orthographic projection of the first region 231 along the first direction Y at least partially overlaps the orthographic projection of the two second regions 232 along the first direction Y.

In some embodiments, other positional relationships may exist between the first region 231 and the second region 232. Fig. 7 to 11 respectively show several other possible enlarged partial structure views of the battery cell 20 according to the embodiment of the present application, for example, fig. 7 to 11 may respectively show several other possible enlarged partial structure views of the battery cell 20 according to the embodiment of the present application. As shown in fig. 7 to 11, the first region 231 and the plurality of second regions 232 may also have other positional relationships therebetween than those shown in fig. 6.

In some embodiments, as shown in fig. 7 to 9, the connection member 23 may include at least one set of second regions 232 arranged along a first direction, each set of second regions 232 including a plurality of second regions 232 arranged along a second direction, the first direction being perpendicular to the second direction. For example, fig. 7 to 9 are still taken as examples of the first direction as the width direction Y of the battery cells 20 and the second direction as the length direction X of the battery cells 20, but the embodiment is not limited thereto.

For example, as shown in fig. 7 to 8, if the connection member 23 includes a plurality of first regions 231, the plurality of first regions 231 may be aligned along a first direction, and at least one set of second regions 232 may be aligned along the first direction with the plurality of first regions 231. As another example, as shown in fig. 9, if the connection member 23 includes a first region 231, the first region 231 may be aligned with at least one set of second regions 232 along the first direction. Specifically, one first region 231 shown in fig. 9 may be located between any two sets of second regions 232 among the sets of second regions 232; or unlike fig. 9, the first region 231 may be located on either side of at least one set of second regions 232.

In other embodiments, as shown in fig. 10 to 11, the connection member 23 may include a plurality of second regions 232 arranged along a first direction, but unlike fig. 6, the connection member 23 includes at least one first region 231 and a plurality of second regions 232 arranged along a second direction, the first direction being perpendicular to the second direction, i.e., the at least one first region 231 is not located in a region between the plurality of second regions 232. The first direction is taken as the width direction Y of the battery cell 20, and the second direction is taken as the length direction X of the battery cell 20, but the embodiment is not limited thereto.

Specifically, as shown in fig. 10 to 11, the plurality of second regions 232 are arranged along the first direction Y, but the orthographic projection of the first region 231 along the first direction Y does not overlap with the orthographic projection of the plurality of second regions 232 along the first direction Y. For example, as shown in fig. 10, if the connecting member 23 includes a plurality of first regions 231, the plurality of first regions 231 may be aligned along the first direction Y and/or along the second direction X such that the plurality of first regions 231 and the plurality of second regions 232 are aligned along the second direction X. In fig. 10, the first areas 231 are located at one side of the second areas 232, so that the area of the connection member 23 can be saved; or, unlike fig. 10, the first areas 231 may be disposed on both sides of the plurality of second areas 232, so that the disposition positions of the first areas 231 are more flexible. As shown in fig. 11, if the connection member 23 includes a first region 231, the first region 231 may be aligned with the plurality of second regions 232 along the second direction X, for example, may be located at any one side of the plurality of second regions 232. As shown in fig. 10 to 11, the first region 231 may correspond to any one of the second regions 232 or may correspond to a region between two of the second regions 232 in the second direction X with respect to any one of the first regions 231 included in the connection member 23.

It should be appreciated that the dimensions of the directions between the first region 231 and the second region 232 in the embodiments of the present application may be flexibly set according to practical applications.

In the present embodiment, the minimum distance D between the first region 231 and the second region 232 is greater than or equal to 0.5mm. Specifically, the minimum distance D between the first region 231 and the second region 232 may refer to a distance between any one of the first regions 231 and any one of the second regions 232, and between two points closest to each other. For example, as shown in fig. 6 to 11, in the connecting member 23 of the embodiment of the present application, each first area 231 and each second area 232 do not overlap, and then, for any one first area 231 and any one second area 232, the minimum distance therebetween is greater than zero.

Further, the minimum distance D between the first region 231 and the second region 232 may be set to be greater than or equal to 0.5mm, so that the first region 231 and the second region 232 may be prevented from being affected by each other due to assembly tolerance or welding width, that is, the welding between the connection member 23 and the electrode terminal 214 may be prevented from affecting the connection between the connection member 23 and the tab 222, thereby resulting in insufficient local strength of the connection member 23 and affecting the stability of the battery cell 20. For example, in fig. 6, the connecting member 23 includes two first areas 231 and three second areas 232 as an example, and the minimum distance D between each first area 231 and two second areas 232 adjacent to the first area 231 is as follows: d is greater than or equal to 0.5mm.

It should be understood that, as shown in fig. 6 to 11, the minimum distance D between any one of the first regions 231 and the different second regions 232 in the embodiments of the present application may be equal or unequal; the minimum distance D between any one of the second regions 232 and the different first regions 231 in the embodiments of the present application may be equal or unequal. But each minimum distance D may satisfy: d is greater than or equal to 0.5mm.

In the present embodiment, the perimeter C of the second region 232 is greater than or equal to 8mm. For the plurality of second regions 232 on the connection member 23, by setting the circumference C of each second region 232 to be 8mm or more, the problem of insufficient local strength due to the excessively small connection region of the connection member 23 and the tab 222 can be avoided, and the problem of excessively large local resistance can also be avoided. The circumferences C of the plurality of second areas 232 included in the connection member 23 may be equal or unequal to satisfy different application scenarios.

It should be understood that each of the second regions 232 in the embodiment of the present application is a connection region between the connection member 23 and the tab 222, for example, if the connection member 23 and the tab 222 are electrically connected by welding, the second region 232 is a region between the connection member 23 and the tab 222.

The shape of each second region 232 on the connection member 23 may be set according to the actual application, and the shapes of different second regions 232 may be the same or different. For example, the shape of each second region 232 may be determined according to the welding manner between the connection member 23 and the tab 222. For example, as shown in fig. 6 to 11, each second region 232 may be rectangular, and the perimeter C of each second region 232 corresponds to: c=2 (l+w1), where L is the length of the second region 232, for example, the length direction of the second region 232 may be identical to the length direction of the connecting member 23, or the length direction of the second region 232 may be the arrangement direction of the plurality of second regions 232 on the connecting member 23, for example, the length direction of the second region 232 is taken as the width direction Y of the battery cell 20 in fig. 6 to 11; w1 is the width of the second region 232, and the width direction of the second region 232 is perpendicular to the length direction of the second region 232, for example, fig. 6 to 11 take the width direction of the second region 232 as the length direction X of the battery cell 20 as an example. For another example, the shape of the second region 232 may be a circle or other shape, and the perimeter C of the second region 232 is the perimeter of the corresponding shape.

Similarly, the shape of each first region 231 on the connection member 23 may be set according to the actual application, and the shapes of different first regions 231 may be the same or different, and the shapes of the first regions 231 and the second regions 232 may be the same or different. For example, the shape of each first region 231 may be determined according to the welding manner between the connection member 23 and the electrode terminal 214. For example, considering that the shape of the electrode terminal 214 is generally a cylinder, fig. 6 to 11 take the first region 231 as an example of a circle to conform to the shape of the end surface of the electrode terminal 214; and fig. 6 to 11 take a case where the shape of the first region 231 is different from the shape of the second region 232. As another example, the first region 231 may be provided in a rectangular shape or other shapes, and the embodiment is not limited thereto.

Fig. 12 shows another possible enlarged partial structure of the battery cell 20 according to the embodiment of the present application, for example, fig. 12 may be an enlarged partial structure of the battery cell 20 shown in fig. 5, and the arrangement of the first region 231 and the second region 232 in fig. 7 is similar to that of fig. 6, but the embodiment of the present application is not limited thereto, and the related description is equally applicable to fig. 7 to 11. As shown in fig. 12, unlike fig. 6 to 11, the second region 232 in the embodiment of the present application may also be annular, for example, square or circular, that is, the connection member 23 and the tab 222 are connected by the annular second region 232. Correspondingly, taking the second area 232 as a square ring shape as an example, the perimeter C of the second area 232 satisfies: c=2 (l+w1), where L is the largest dimension of the second region 232 in the length direction, and W1 is the largest dimension of the second region 232 in the width direction, that is, the largest circumference of the square ring-shaped second region 232.

Similarly, as shown in fig. 12, each first region 231 of the embodiment of the present application may also be annular in shape, for example, the first region 231 may be a circular ring or a square ring. Specifically, the shape of the first region 231 is exemplified as a circular ring. Fig. 13 shows a schematic partial cross-section of a battery cell 20 according to an embodiment of the present application, which may be a cross-section perpendicular to the length direction X of the battery cell 20. As shown in fig. 12 and 13, the connection member 23 may be provided with a through hole through which at least a portion of the electrode terminal 214 is passed and received, and the connection member 23 and the electrode terminal 214 may be welded by butt welding so as to surround the circumferential region of the through hole of the connection member 23 to form a circular ring-shaped first region 231.

For another example, the first area 231 may be square ring or other shapes by other connection methods or other shapes of through holes, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the area S of the second region 232 has a value range of [0.16mm ] ² ，240mm ² ]. The area S of each second region 232 in the embodiment of the present application may be calculated according to the actual shape of the second region 232. For example, as shown in fig. 6 to 11, if the second region 232 is rectangular, the area S of the second region 232 satisfies: s=l×w1; as shown in fig. 12 and 13, if the second region 232 is square annular, the area S of the second region 232 satisfies: s=2 (w1+l-2W 2) W2, where W2 represents the annular width of the square ring, W2 is related to the welding width, and the embodiment of the present application takes as an example that the width of the annular region in the length direction of the square ring is equal to the width of the annular region in the width direction.

If the area S of the second region 232 is excessively large, each second region 232 occupies a larger area of the connection member 23, and thus the area of the first region 231 is reduced, reducing the connection strength of the connection member 23 and the electrode terminal 214. Conversely, if the area S of the second region 232 is too small, the connection strength between the connection member 23 and the tab 222 is affected, and the overcurrent area of the battery cell 20 is also reduced. Therefore, the area S of the second region 232 should be reasonably set, for example, the area S of the second region 232 may be equal to 0.16mm ² 、1mm ² 、20mm ² 、40mm ² 、60mm ² 、80mm ² 、100mm ² 、120mm ² 、140mm ² 、160mm ² 、180mm ² 、200mm ² 、220mm ² And 240mm ² 。

In the embodiment of the present application, the area S of the second region 232 satisfies: the value range of S/L is [0.8mm,5mm ], and/or the value range of S/W1 is [0.8mm,8mm ]; where L denotes a dimension of the second region 232 in the length direction of the second region 232, and W1 denotes a dimension of the second region 232 in the width direction of the second region 232. For example, as shown in fig. 6 to 13, for the second region 232 having a different shape, the length direction of the second region 232 may be a direction in which the size of the second region 232 is larger, and correspondingly, the width direction of the second region 232 may be a direction in which the size of the second region 232 is smaller, wherein the size L of the length direction of the second region 232 is larger than the size W1 of the width direction of the second region 232. For example, in the embodiment of the present application, the length direction of the second region 232 is mainly taken as the width direction Y of the battery cell 20, and the width direction of the second region 232 is taken as the length direction X of the battery cell 20.

If the S/L is too small, the area of the second region 232 will be too small when the dimension L of the second region 232 in the length direction is constant, so that the connection strength between the connection member 23 and the tab 222 will be reduced, and the overcurrent area of the battery cell 20 will be reduced, thereby affecting the safety and stability of the battery cell 20. Conversely, if the S/L is too large, the area of the second region 232 may be too large if the dimension L of the second region 232 in the longitudinal direction is constant, or the dimension W1 of the second region 232 in the width direction of the second region 232 may be too large, which may result in the excessively large volume of the connection member 23, affecting the space utilization inside the battery cell 20 and further reducing the energy density of the battery cell 20. Therefore, the S/L is not set too large or too small, and for example, the value of the S/L may be set to 0.8mm, 1.4mm, 2mm, 2.6mm, 3.2mm, 3.8mm, 4.4mm, and 5mm.

Similarly, S/W1 is not set too large or too small. If the S/W1 is too small, the area of the second region 232 will be too small when the dimension W1 of the second region 232 in the width direction is constant, which will reduce the connection strength between the connection member 23 and the tab 222, and also reduce the overcurrent area of the battery cell 20, thereby affecting the safety and stability of the battery cell 20. Conversely, if S/W1 is too large, the area of the second region 232 may be too large, or the dimension L of the second region 232 along the length direction may be too large, which may result in the excessively large volume of the connection member 23, affecting the space utilization inside the battery cell 20 and further reducing the energy density of the battery cell 20. Thus, the S/W1 is not set too large or too small, and for example, the value of the S/W1 may be set to 0.8mm, 1.4mm, 2mm, 2.6mm, 3.2mm, 3.8mm, 4.4mm, 5mm, 5.6mm, 6.2mm, 6.8mm, 7.4mm and 8mm.

In the embodiment of the present application, the connection member 23 may include at least one first area 231 and a plurality of second areas 232, and the arrangement manner of the at least one first area 231 and the plurality of second areas 232 may be set according to practical applications. For example, as shown in fig. 6, when the connection member 23 includes n first regions 231, n+1 second regions 232 may be correspondingly provided, and the n first regions 231 and the n+1 second regions 232 are arranged at intervals such that each first region 231 is located between two second regions 232, and one first region 231 is provided between every adjacent two second regions 232.

For example, as shown in fig. 12 to 13, the connection member 23 includes two first regions 231 and three second regions 232, and one first region 231 of the two first regions 231 is disposed between each adjacent two second regions 232 of the three second regions 232, so that the first regions 231 and the second regions 232 are disposed at intervals from each other, which can increase the area of the connection region between the connection member 23 and the electrode terminal 214, so as to ensure the connection strength between the two, and can increase the area of the connection region between the connection member 23 and the tab 222, so as to ensure the connection strength between the two. In addition, the first area 231 and the second area 232 are uniformly distributed on the connecting member 23, so that the temperature of the connecting member 23 can be uniformly distributed, and the influence of the over-high temperature of the local area on the safety of the battery cell 20 can be avoided; the first region 231 and the second region 232 can be kept from being influenced by each other, and the stability of the battery cell 20 is ensured.

As another example, fig. 14 illustrates yet another possible partial structural enlargement of the battery cell 20 of an embodiment of the present application, for example, fig. 14 may be one possible partial structural enlargement of the battery cell 20 illustrated in fig. 5. As shown in fig. 14, the connection member 23 includes two first regions 231 and two second regions 232, and the two first regions 231 are located between the two second regions 232, so that the area of the connection region between the connection member 23 and the electrode terminal 214 can be increased to ensure the connection strength between the two, and the area of the connection region between the connection member 23 and the tab 222 can be increased to ensure the connection strength between the two. In addition, the second region 232 is not arranged between the two first regions 231, so that the connection difficulty between the connecting member 23 and the tab 222 can be reduced, and the processing efficiency can be improved.

Other arrangements of the connecting members 23 than those shown in fig. 6 to 14 are also possible. For example, fig. 15 and 16 show other possible partial structure enlarged views of the battery cell 20 of the embodiment of the present application, respectively, for example, fig. 15 and 16 may be possible partial structure enlarged views of the battery cell 20 shown in fig. 5. In the case where the connection member 23 includes two first regions 231 and two second regions 232, the connection member 23 may also be provided in a manner as shown in fig. 15 and 16, so that the position setting of the first regions 231 and the second regions 232 may be more flexible.

As another example, unlike the case where the connection member 23 shown in fig. 6 to 16 includes two first regions 231, the connection member 23 of the embodiment of the present application may further include more or less first regions 231. For example, fig. 17 shows still another possible partial structure enlargement of the battery cell 20 of the embodiment of the present application, for example, fig. 17 may be one possible partial structure enlargement of the battery cell 20 shown in fig. 5. As shown in fig. 17, the connection member 23 may include only one first region 231, and then the connection member 23 may include two second regions 232 respectively located at two sides of the first region 231, so as to increase the area of the connection region between the connection member 23 and the tab 222, and ensure the connection strength therebetween.

In the present embodiment, the same connection member 23 may be electrically connected with at least one electrode terminal 214, for example, the connection member 23 may be used for electrical connection with at least one positive electrode terminal 214a or for electrical connection with at least one negative electrode terminal 214 b. Specifically, taking any one of the connection members 23 of the battery cells 20 as an example, the connection member 23 may include at least one first region 232, and the at least one first region 231 is used to implement a connection with the at least one electrode terminal 214. For example, the connection member 23 and any one of the electrode terminals 214 may be electrically connected through at least one first region 231. In the present embodiment, the electrical connection between the connection member 23 and any one of the electrode terminals 214 through one of the first regions 231 is mainly described as an example, but the embodiment is not limited thereto.

In the embodiment of the present application, the same connection member 23 of the embodiment of the present application may be electrically connected to at least one tab 222, for example, the connection member 23 may be used for electrically connecting to at least one positive tab 222a or for electrically connecting to at least one negative tab 222 b. Accordingly, the plurality of second regions 232 included in the connection member 23 of the embodiment of the present application may be used to electrically connect with the same or different tabs 222 of the electrode assembly 22.

In some embodiments, the plurality of second regions 232 are configured to electrically connect with the same tab 222 of the electrode assembly 22. Specifically, taking any one of the connection members 23 of the battery cells 20 as an example, the connection members 23 may include a plurality of second regions 232, in the embodiment of the present application, the plurality of second regions 232 are mainly used to make electrical connection with the same tab 222, that is, for any one tab 222 of the electrode assembly 22, electrical connection with the connection members 23 may be made through the plurality of second regions 232. This can make the current distribution between the connection member 23 and the tab 222 more uniform, and thus can reduce the temperature rise of the connection member 23.

In some embodiments, a plurality of second regions 232 may also be used to electrically connect with different tabs 222. Specifically, taking any one of the connection members 23 of the battery cells 20 as an example, the connection members 23 may be electrically connected to the plurality of tabs 222, for example, the connection members 23 may be electrically connected to the plurality of positive electrode tabs 222a or to the plurality of negative electrode tabs 222 b. For a plurality of tabs 222 connected to the same connection member 23, the plurality of tabs 222 may correspond to a plurality of second regions 232, wherein each tab 222 may correspond to at least one second region 232 such that the connection member 23 includes a plurality of second regions 232. That is, the plurality of second regions 232 included in the connection member 23 of the embodiment of the present application may also be used to electrically connect with the plurality of tabs 222, for example, the plurality of second regions 223 may be electrically connected with the plurality of positive electrode tabs 222a or electrically connected with the plurality of negative electrode tabs 222 b.

Further, the connection member 23 in the embodiment of the present application may include one or more first regions and a plurality of second regions 232, and each second region 232 of the plurality of second regions 232 is not overlapped with each first region 231, so that the connection strength between the connection member 23 and the electrode terminal 214 may be ensured, and the connection strength between the connection member 23 and the tab 222 may also be ensured, thereby ensuring the stability of the battery cell 20.

Further, the first region 231 of the connection member 23 in the embodiment of the present application is located between two second regions 232 of the plurality of second regions 232, that is, at least one first region 231 of the connection member 23 is located between two second regions 232, so that under the condition that the size of the connection member 23 is limited, the position of the second region 232 can be set more flexibly, and the size of the second region 232 can be increased as much as possible, that is, the area size of the connection region between the connection member 23 and the tab 222 can be increased, and then the connection strength between the connection member 23 and the tab 222 can be improved, so as to ensure the stability and safety of the battery cell 20.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising:

a housing (21), a first wall (213) of the housing (21) being provided with an electrode terminal (214);

an electrode assembly (22) housed in the case (21), the electrode assembly (22) including a tab (222);

-a connection member (23), the connection member (23) comprising a first region (231) for electrical connection with the electrode terminal (214) and a plurality of second regions (232), the plurality of second regions (232) for electrical connection with the tab (222).

2. The battery cell of claim 1, wherein the first region (231) and the plurality of second regions (232) do not overlap, the first region (231) being located between two second regions (232) of the plurality of second regions (232).

3. The battery cell of claim 2, wherein a minimum distance between the first region (231) and the second region (232) is greater than or equal to 0.5mm.

4. A battery cell according to any of claims 1 to 3, wherein the perimeter of the second region (232) is greater than or equal to 8mm.

5. A battery cell according to any one of claims 1 to 3, wherein the area of the second region (232) has a value in the range of [0.16mm ² ，240mm ² ]。

6. A battery cell according to any of claims 1 to 3, wherein the area S of the second region (232) satisfies:

the value of S/L ranges from [0.8mm,5mm ], and/or,

the value range of S/W1 is [0.8mm,8mm ];

wherein L represents a dimension of the second region (232) in a length direction of the second region (232), and W1 represents a dimension of the second region (232) in a width direction of the second region (232).

7. A battery cell according to any one of claims 1 to 3, wherein the connecting member (23) comprises two first regions (231) and two second regions (232), both first regions (231) being located between both second regions (232); or,

the connecting member (23) comprises two first areas (231) and three second areas (232), wherein one first area (231) of the two first areas (231) is arranged between every two adjacent second areas (232) in the three second areas (232).

8. A battery cell according to any one of claims 1 to 3, wherein the connecting member (23) is of sheet-like structure.

9. A battery cell according to any one of claims 1 to 3, wherein the housing (21) comprises:

A housing (211), the housing (211) being a hollow structure having an opening (2111);

-a cover plate (212), said cover plate (212) being adapted to cover said opening (2111).

10. The battery cell of claim 9, wherein the cover plate (212) is a wall of the battery cell having a largest area.

11. The battery cell of claim 9, wherein the cover plate (212) is the first wall (213).

12. The battery cell of claim 11, wherein the electrode terminal (214) is located in a region proximate to the first side (2121) of the cap plate (212).

13. The battery cell of claim 12, wherein the first edge (2121) is an edge of minimum length of the cover plate (212).

14. The battery cell according to claim 12 or 13, wherein a plurality of electrode terminals (214) are provided in a region near the first side (2121), and the plurality of electrode terminals (214) are electrically connected to the tab (222) through the same connection member (23).

15. The battery cell of claim 12 or 13, wherein a minimum distance between the electrode terminal (214) and a second side (2122) is greater than a minimum distance between the electrode terminal (214) and the first side (2121), the second side (2122) intersecting the first side (2121).

16. The battery cell according to claim 12 or 13, wherein all electrode terminals (214) arranged in a region close to the first side (2121) are symmetrically distributed with respect to a central axis (2121 a) perpendicular to the first side (2121).

17. The battery cell according to any one of claims 11 to 13, characterized in that the battery cell includes a positive electrode terminal (214 a) and a negative electrode terminal (214 b), the positive electrode terminal (214 a) and the negative electrode terminal (214 b) being located at both ends in a length direction of the cap plate (212).

18. The battery cell according to claim 9, wherein the case (211) includes a recess (2113), the recess (2113) being provided corresponding to the electrode terminal (214), the recess (2113) being recessed from a bottom wall (2112) of the case (211) toward the opening (2111), the recess (2113) being for accommodating the electrode terminal (214) of the battery cell adjacent to the bottom wall (2112).

19. The battery cell according to claim 18, wherein the recess (2113) penetrates the housing (211) in a width direction of the housing (211).

20. A battery cell according to any one of claims 1 to 3, wherein the plurality of second regions (232) are for electrical connection with the same tab (222) of the electrode assembly (22).

21. A battery, comprising:

a plurality of the battery cells according to any one of claims 1 to 20.

22. The battery according to claim 21, wherein a plurality of the battery cells are arranged in a thickness direction of the battery cells.

23. A powered device, comprising:

a plurality of battery cells according to any one of claims 1 to 20, the battery cells being configured to provide electrical energy to the powered device.