Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, a first electrode terminal, a first current collecting member, and a plurality of electrode assemblies. The shell comprises a first wall part and a second wall part which are adjacently arranged, and the area of the outer surface of the first wall part is larger than that of the outer surface of the second wall part. The multiple electrode assemblies are contained in the shell, and first tabs are arranged at the same ends of the multiple electrode assemblies in the thickness direction of the first wall part. The first electrode terminal is provided on the second wall portion. A first current collecting member is received within the housing, the first current collecting member connecting the first electrode terminal and each of the first tabs. Therefore, the distance between the connecting area of the first tab and the first current collecting component and the connecting area of the first current collecting component and the first electrode terminal is farther, the assembly difficulty between the first current collecting component and the first electrode terminal and the assembly difficulty between the first tab are reduced, and the risk of interference between the first electrode terminal and the first tab is reduced; the stability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, electric tools, drones, energy storage devices and other fields. Battery devices include battery cells. In the manufacturing process of battery cells, in addition to considering the performance of battery cells, the service life of battery cells is also an issue that cannot be ignored. Therefore, how to extend the service life of battery cells is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery device and an electrical device, which can increase the service life of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a first electrode terminal, a first current collecting member and a plurality of electrode assemblies; the shell comprises a first wall portion and a second wall portion arranged adjacent to each other, the area of ​​the outer surface of the first wall portion is larger than the area of ​​the outer surface of the second wall portion; the plurality of electrode assemblies are accommodated in the shell, and along the thickness direction of the first wall portion, the same end of the plurality of electrode assemblies is provided with a first pole ear; the first electrode terminal is provided at the second wall portion; the first current collecting member is accommodated in the shell, and the first current collecting member connects the first electrode terminal and each first pole ear.

[0006] In the above technical solution, multiple electrode assemblies are provided with first pole ears at the same end along the thickness direction of the first wall portion, and the first electrode terminal is provided on the second wall portion adjacent to the first wall portion, so that the first pole ear and the first electrode terminal are respectively located on the two adjacent sides of the electrode assembly, so that the connection area between the first pole ear and the first current collecting member and the connection area between the first current collecting member and the first electrode terminal can be farther apart, which is conducive to reducing the difficulty of assembling the first current collecting member and the first electrode terminal and the first pole ear, and can reduce the risk of interference between the first electrode terminal and the first pole ear, so that the battery cell is more stable during use and the service life of the battery cell is extended.

[0007] In some embodiments, the first current collecting member includes a first connection portion and a second connection portion; at least a portion of the first connection portion is disposed between the first wall portion and a plurality of electrode assemblies along the thickness direction of the first wall portion, and the first connection portion is connected to each first pole lug; at least a portion of the second connection portion is disposed between the second wall portion and a plurality of electrode assemblies along the thickness direction of the second wall portion, and the second connection portion connects the first connection portion and the first electrode terminal. By disposing at least a portion of the first connection portion between the electrode assembly and the first wall portion, it is beneficial for the first connection portion to be connected to each first pole lug, which is convenient for reducing the assembly difficulty between the first connection portion and the first pole lug, and disposing at least a portion of the second connection portion between the electrode assembly and the second wall portion is beneficial for connecting the second connection portion to the first electrode terminal, which is convenient for reducing the assembly difficulty between the second connection portion and the first electrode terminal. Therefore, adopting such a structure can reduce the assembly difficulty between the first current collecting member and the first pole lug and the first electrode terminal, thereby helping to reduce the assembly cost of the battery cell.

[0008] In some embodiments, a plurality of electrode assemblies are arranged along the thickness direction of the second wall portion, and the first connection portion includes a first portion and a plurality of second portions; the first portion extends along the thickness direction of the second wall portion; a plurality of second portions are spaced apart from the first portion along the thickness direction of the second wall portion, and each second portion is connected to at least one first pole lug. By arranging each second portion to be connected to at least one first pole lug, an electrical connection between the first pole lug and the first connection portion can be achieved, and by arranging a plurality of second portions spaced apart from the first portion along the thickness direction of the second wall portion, on the one hand, it is easy to achieve the connection between the second portion and the first pole lug, and the difficulty of assembling between the first connection portion and the first pole lug is reduced. On the other hand, the plurality of second portions spaced apart can reduce the material usage of the first connection portion, reduce the weight of the first connection portion, and thus help reduce the energy density of the battery cell.

[0009] In some embodiments, the first part, the second part and the second connecting part are arranged and connected in a body, so that the difficulty of assembling the second part and the first electrode tab can be reduced, and the difficulty of assembling the second connecting part and the first electrode terminal can also be reduced, which is conducive to the arrangement and installation of the first current collecting member.

[0010] In some embodiments, the first part, the second part and the second connecting portion are integrally formed. In this way, on the one hand, the connection strength between the first part and the second part and the connection strength between the first part and the second connecting portion can be improved, and the risk of the first current collecting member being damaged by external force can be reduced. On the other hand, the integral formation of the first part, the second part and the second connecting portion is conducive to reducing the difficulty of manufacturing the first current collecting member.

[0011] In some embodiments, the housing includes two second wall portions arranged opposite to each other along the thickness direction of the second wall portion, the first wall portion connects the two second wall portions, and each second wall portion is provided with a first electrode terminal; the first current collecting member includes two second connecting portions, the first connecting portion connects the two second connecting portions, and each second connecting portion is connected to a first electrode terminal. By providing the first electrode terminal on both second wall portions, on the one hand, the output or output of the electric energy of the battery cell can be realized through any one of the first electrode terminals, making the wiring more convenient, and on the other hand, by connecting the two first electrode terminals at the same time, the battery cell can withstand a larger current input or output, reducing the risk of the electrode terminal being damaged.

[0012] In some embodiments, the housing includes two second walls arranged opposite to each other along the thickness direction of the second wall, and the first wall connects the two second walls; along the thickness direction of the first wall, the same end of the plurality of electrode assemblies is provided with a second pole ear, and the first pole ear has opposite polarity to the second pole ear; the battery cell also includes a second electrode terminal and a second current collecting member; the second electrode terminal and the first electrode terminal are arranged on the same second wall; the second current collecting member is accommodated in the housing, and the second current collecting member is electrically connected to the second electrode terminal and each second pole ear. By arranging the second pole ear at the same end of the plurality of electrode assemblies along the thickness direction of the first wall, it is convenient for the second current collecting member to cooperate with each second pole ear, and the difficulty of assembling the second current collecting member is reduced; and by arranging the second electrode terminal on the second wall, the connection area between the second pole ear and the second current collecting member and the connection area between the second current collecting member and the second electrode terminal can be separated from each other, which is convenient for reducing the difficulty of assembling the second current collecting member, the second electrode terminal and the second pole ear, and can reduce the risk of interference between the second electrode terminal and the second pole ear, and improve the stability of the battery cell. In particular, when the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be effectively reduced, thereby facilitating the improvement of the assembly quality and stability of the second electrode terminal and the second electrode tab connected to the second current collecting member. The first electrode terminal and the second electrode terminal are arranged on the same second wall portion, so that the first electrode terminal and the second electrode terminal share a space in the thickness direction of the second wall portion, which is conducive to saving the space occupied by the battery cell in the thickness direction of the second wall portion, thereby improving the space utilization rate of the battery cell and helping to improve the volume energy density of the battery cell.

[0013] In some embodiments, the housing includes two second wall portions arranged opposite to each other along the thickness direction of the second wall portion, and the first wall portion connects the two second wall portions; along the thickness direction of the first wall portion, the same end of the plurality of electrode assemblies is provided with a second pole ear, and the first pole ear and the second pole ear have opposite polarities; the battery cell also includes a second electrode terminal and a second current collecting member; the second electrode terminal and the first electrode terminal are respectively arranged on the two second wall portions; the second current collecting member is accommodated in the housing, and the second current collecting member is electrically connected to the second electrode terminal and each second pole ear. By respectively arranging the first electrode terminal and the second electrode terminal on the two second wall portions, the first electrode terminal and the second electrode terminal are far apart, the risk of interference between the first electrode terminal and the second electrode terminal is reduced, and the reliability of the battery cell is improved.

[0014] In some embodiments, the second current collecting member includes a third connection portion and a fourth connection portion; at least a portion of the third connection portion is disposed between the first wall portion and the plurality of electrode assemblies along the thickness direction of the first wall portion, and the third connection portion is connected to each second pole ear; at least a portion of the fourth connection portion is disposed between the second wall portion and the plurality of electrode assemblies along the thickness direction of the second wall portion, and the fourth connection portion connects the third connection portion and the second electrode terminal. By disposing at least a portion of the third connection portion between the electrode assembly and the first wall portion, it is advantageous to connect the third connection portion to each second pole ear, and it is convenient to reduce the difficulty of assembling between the third connection portion and the second pole ear, and disposing at least a portion of the fourth connection portion between the electrode assembly and the second wall portion, it is advantageous to connect the fourth connection portion to the second electrode terminal, and it is convenient to reduce the difficulty of assembling between the fourth connection portion and the second electrode terminal. Therefore, adopting such a structure can reduce the difficulty of assembling between the second current collecting member and the second pole ear and the second electrode terminal, thereby facilitating the reduction of the assembly cost of the battery cell.

[0015] In some embodiments, a plurality of electrode assemblies are arranged along the thickness direction of the second wall portion, and the third connection portion includes a third portion and a plurality of fourth portions; the third portion extends along the thickness direction of the second wall portion; a plurality of fourth portions are arranged at intervals in the third portion along the thickness direction of the second wall portion, and each fourth portion is connected to at least one second pole lug. By arranging each fourth portion to be connected to at least one second pole lug, an electrical connection between the second pole lug and the third connection portion can be achieved. By arranging a plurality of fourth portions at intervals with the third portion along the thickness direction of the second wall portion, on the one hand, it is easy to achieve the connection between the fourth portion and the second pole lug, and the difficulty of assembling between the third connection portion and the second pole lug is reduced. On the other hand, the plurality of fourth portions arranged at intervals can reduce the material usage of the third connection portion and reduce the weight of the third connection portion, thereby facilitating the reduction of the energy density of the battery cell.

[0016] In some embodiments, the third portion, the fourth portion and the fourth connecting portion are arranged and connected in a body, so that the difficulty of assembling the fourth portion and the second electrode tab can be reduced, and the difficulty of assembling the fourth connecting portion and the second electrode terminal can also be reduced, which is conducive to the arrangement and installation of the second current collecting member.

[0017] In some embodiments, the third part, the fourth part and the fourth connecting part are integrally formed. In this way, on the one hand, the connection strength between the third part and the fourth part and the connection strength between the third part and the fourth connecting part can be improved, and the risk of the second current collecting member being damaged by external force can be reduced. On the other hand, the integral formation of the third part, the fourth part and the fourth connecting part is conducive to reducing the difficulty of manufacturing the second current collecting member.

[0018] In some embodiments, each second wall portion is provided with a second electrode terminal; the second current collecting member includes two fourth connection portions, the third connection portion connects the two fourth connection portions, and each fourth connection portion connects a second electrode terminal. By providing the second electrode terminal on both second wall portions, on the one hand, the output or output of the electric energy of the battery cell can be realized through any one of the second electrode terminals, making the wiring more convenient; on the other hand, by connecting the two second electrode terminals at the same time, the battery cell can withstand a larger current input or output, reducing the risk of the electrode terminal being damaged.

[0019] In some embodiments, there are two first wall portions, the two first wall portions are arranged opposite to each other along the thickness direction of the first wall portion, and the first current collecting member includes a first connecting portion and a second connecting portion; the first connecting portion is connected to each first pole ear; the second connecting portion connects the first connecting portion and the first electrode terminal; wherein, along the thickness direction of the first wall portion, the first pole ear and the second pole ear are arranged at the same end of the multiple electrode assemblies, the first connecting portion and the third connecting portion are located on the same side of the multiple electrode assemblies, and along the thickness direction of the first wall portion, at least part of the first connecting portion and at least part of the third connecting portion are located between the same first wall portion and the multiple electrode assemblies. By arranging the first electrode tab and the second electrode tab at the same end of the plurality of electrode assemblies, and the first connecting portion and the third connecting portion being located on the same side of the plurality of electrode assemblies, on the one hand, it is convenient to connect the first current collecting member to the first electrode tab, and to connect the second current collecting member to the second electrode tab, which is beneficial to reducing the difficulty of assembling the first current collecting member and the second current collecting member; on the other hand, the first current collecting member and the second current collecting member can share a space in the thickness direction of the first wall portion, which is beneficial to saving the space occupied by the first current collecting member and the second current collecting member in the thickness direction of the first wall portion, thereby improving the space utilization of the battery cell and improving the volume energy density of the battery cell.

[0020] In some embodiments, there are two first wall portions, and the two first wall portions are arranged opposite to each other along the thickness direction of the first wall portion. The first current collecting member includes a first connecting portion and a second connecting portion; the first connecting portion is connected to each first pole ear; the second connecting portion connects the first connecting portion and the first electrode terminal; wherein, along the thickness direction of the first wall portion, the first pole ear and the second pole ear are respectively arranged at opposite ends of the plurality of electrode assemblies, the first connecting portion and the third connecting portion are respectively located on opposite sides of the plurality of electrode assemblies, and along the thickness direction of the first wall portion, at least a portion of the first connecting portion is located between one of the two first wall portions and the plurality of electrode assemblies, and at least a portion of the third connecting portion is between the other of the two first wall portions and the plurality of electrode assemblies. By respectively arranging the first pole lug and the second pole lug at opposite ends of a plurality of electrode assemblies, and respectively arranging the first connecting portion and the third connecting portion at both sides of the plurality of electrode assemblies in the thickness direction of the first wall portion, on the one hand, it is convenient for the first current collecting member and the second current collecting member to be connected to the first pole lug and the second pole lug respectively, which is conducive to alleviating the mutual interference between the first current collecting member and the second current collecting member; on the other hand, the first pole lug and the second pole lug with opposite polarities can be kept away from each other, and the first connecting portion of the first current collecting member and the third connecting portion of the second current collecting member can be kept away from each other, which is conducive to reducing the risk of short circuit between the first pole lug and the second pole lug and between the first current collecting member and the second current collecting member, so as to improve the reliability of the battery cell.

[0021] In some embodiments, along the thickness direction of the second wall portion, the second connection portion and the fourth connection portion are located on the same side of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are disposed on the same second wall portion. By disposing the first electrode terminal and the second electrode terminal on the same second wall portion, and the second connection portion and the fourth connection portion are located on the same side of the plurality of electrode assemblies, on the one hand, it is convenient to connect the second connection portion with the first electrode terminal, and to connect the fourth connection portion with the second electrode terminal, and on the other hand, the battery cell is configured such that the first electrode terminal and the second electrode terminal are provided at the same end in the thickness direction of the second wall portion, and the second connection portion and the fourth connection portion can share space in the thickness direction of the second wall portion, thereby improving the space utilization of the battery cell and increasing the volume energy density of the battery cell. In addition, in a battery cell adopting such a structure, the first electrode terminal and the second electrode terminal are arranged on the same second wall portion, so that the wall portion of the outer shell facing the electrode assembly along the thickness direction of the first wall portion is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating stacking of multiple battery cells along the thickness direction of the first wall portion, and on the other hand, it is possible to separate the area where the first current collecting member is connected to the first electrode terminal and the area where the first current collecting member is connected to the first pole lug, and to separate the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole lug, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole lug, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole lug, and can reduce the interference problem between the first electrode terminal and the first pole lug and between the second electrode terminal and the second pole lug. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0022] In some embodiments, along the thickness direction of the second wall portion, the second connection portion and the fourth connection portion are located on opposite sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively disposed on the two second wall portions. By respectively arranging the first electrode terminal and the second electrode terminal on the two second wall portions, and the second connection portion and the fourth connection portion are located on opposite sides of the plurality of electrode assemblies, it is convenient to connect the second connection portion to the first electrode terminal, and to connect the fourth connection portion to the second electrode terminal. In addition, in the battery cell with such a structure, the first electrode terminal and the second electrode terminal are arranged on the two second wall portions, so that the wall portion of the housing facing the electrode assembly along the thickness direction of the first wall portion is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating stacking of multiple battery cells along the thickness direction of the first wall portion, and on the other hand, the area where the first current collecting member is connected to the first electrode terminal and the area where the first current collecting member is connected to the first pole tab can be separated from each other, and the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole tab can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole tab, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole tab, and reducing the interference problem between the first electrode terminal and the first pole tab and between the second electrode terminal and the second pole tab. The first electrode terminal and the second electrode terminal are respectively arranged on the two second wall portions, which can reduce the risk of interference between the first electrode terminal and the second electrode terminal.

[0023] In some embodiments, along the thickness direction of the first wall portion, the first connection portion and the third connection portion are located on the same side of the plurality of electrode assemblies; the battery cell further comprises a first insulating member, along the thickness direction of the first wall portion, a portion of the first insulating member is disposed between the first wall portion and the first current collecting member to insulate and isolate the first wall portion and the first current collecting member, and another portion of the first insulating member is disposed between the first wall portion and the second current collecting member to insulate and isolate the first wall portion and the second current collecting member. In this way, the first insulating member is located between the first current collecting member and the second current collecting member and the housing in the thickness direction of the first wall portion. The battery cell adopting such a structure can achieve insulation isolation between the first current collecting member and the housing and between the second current collecting member and the housing, which is conducive to reducing the risk of short circuit between the first current collecting member and the second current collecting member and the housing, and can achieve the first connection portion and the third connection portion sharing a first insulating member, which is conducive to optimizing the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0024] In some embodiments, the battery cell further includes a first insulating member, and along the thickness direction of the first wall portion, at least a portion of the first insulating member is disposed between the first wall portion and the plurality of electrode assemblies to insulate and isolate the first wall portion and the plurality of electrode assemblies. In this way, at least a portion of the first insulating member is located between the first wall portion and the plurality of electrode assemblies in the thickness direction of the first wall portion, which is conducive to reducing the risk of short circuit between the housing and the plurality of electrode assemblies.

[0025] In some embodiments, along the thickness direction of the first wall portion, the first insulating member is at least partially disposed between the first wall portion and the first current collecting member to insulate and isolate the first wall portion and the first current collecting member. In this way, at least a portion of the first insulating member is located between the first wall portion and the first current collecting member in the thickness direction of the first wall portion, which is conducive to reducing the risk of short circuit between the housing and the first current collecting member.

[0026] In some embodiments, the first insulating member is provided with a through hole. Thus, by providing the through hole on the first insulating member, the weight of the first insulating member can be reduced, thereby reducing the weight of the battery cell and improving the mass energy density of the battery cell.

[0027] In some embodiments, the plurality of electrode assemblies are arranged along the thickness direction of the second wall portion. By arranging the plurality of electrode assemblies along the thickness direction of the second wall portion, it is convenient to connect the first current collecting member with each first electrode tab, thereby reducing the difficulty of assembling the first current collecting member and the plurality of electrode assemblies.

[0028] In some embodiments, the battery cell further comprises at least one separator, wherein the at least one separator separates the plurality of electrode assemblies into a plurality of electrode assembly groups, each electrode assembly group comprising at least one electrode assembly. The separator separates the plurality of electrode assemblies, and the separator can reduce the risk of interference between the electrode assemblies on both sides thereof in the thickness direction of the second wall portion.

[0029] In some embodiments, there are multiple separators, and electrode assembly groups are arranged on both sides of each separator. By arranging electrode assembly groups on both sides of each separator, the separators play a role in separating multiple electrode assembly groups, so as to reduce the risk of expansion stress accumulation of electrode assemblies of adjacent electrode assembly groups, thereby causing mutual compression and deformation of electrode assemblies, and effectively improve the reliability of battery cells.

[0030] In some embodiments, at least a portion of the separator is a phase change material. In this way, during the charge and discharge process of the battery cell, the heat generated by the electrode assembly in the battery cell can be absorbed by the phase change material, thereby reducing the risk of thermal runaway of the electrode assembly due to excessive temperature.

[0031] In some embodiments, the battery cell further includes a second insulating member, a receiving space is formed inside the second insulating member, and an opening is formed at at least one end of the receiving space along the thickness direction of the first wall portion, and the plurality of electrode assemblies are received in the receiving space. By receiving the plurality of electrode assemblies in the receiving space of the second insulating member, the second insulating member can insulate and isolate the housing and the plurality of electrode assemblies, thereby reducing the risk of short circuit between the housing and the plurality of electrode assemblies.

[0032] In some embodiments, the capacity of the battery cell is greater than or equal to 1000 Ah. In this way, the battery cell has a larger capacity, which improves the performance of the battery cell.

[0033] In some embodiments, the number of electrode assemblies is greater than or equal to 4. In this way, when the volume of the electrode assembly remains unchanged, increasing the number of electrode assemblies can increase the capacity of the battery cell, thereby obtaining a battery cell with a larger capacity by increasing the number of electrode assemblies. Compared with obtaining a larger battery capacity by increasing the number of battery cells, the battery cell obtained by increasing the electrode assembly can save the use of battery cell housings, insulating parts, etc. Under the condition of the same battery capacity, such a battery cell can have a higher volume energy density and a lower production cost, which helps to improve the performance of the battery cell.

[0034] In some embodiments, the first wall portion is the wall portion with the largest outer surface area in the housing. In this way, the first pole ear is arranged at the same end of the electrode assembly along the thickness direction of the first wall portion, which, on the one hand, enables the first pole ear to face the wall portion of the housing with the largest outer surface area, thereby reducing the difficulty of connecting the first pole ear with the first current collecting member. On the other hand, when multiple battery cells are stacked along the thickness direction of the first wall portion, the first wall portions of the multiple battery cells are stacked, making the stacking of the multiple battery cells more stable and the placement of the battery cells more stable.

[0035] In some embodiments, the shell is in a rectangular parallelepiped shape, and the size of the shell along the thickness direction of the first wall is L1, and the size of the shell along the first direction is L2. The first direction, the thickness direction of the first wall, and the thickness direction of the second wall are perpendicular to each other, and L2 / L1≥2. By setting L2 / L1≥2, the size of the shell along the thickness direction of the first wall is smaller than the size of the shell along the first direction, so that the size of the electrode assembly along the thickness direction of the first wall is smaller than the size of the electrode assembly along the first direction, and the first pole ear of the electrode assembly is arranged along the thickness direction of the first wall, so that the distance between the electrode assembly and the first pole ear is closer, which helps the first pole ear to input or output electrical energy to the electrode assembly, and improves the performance of the battery cell.

[0036] In some embodiments, the housing includes a shell and an end cap, the shell has an opening, and the end cap closes the opening; the shell includes a first wall portion, and the second wall portion is the end cap. By setting the shell to include the first wall portion and the second wall portion as the end cap, it is convenient to install the first electrode terminal on the second wall portion, thereby reducing the difficulty of installing the battery cell.

[0037] In a second aspect, an embodiment of the present application provides a battery device, comprising a battery cell provided by any embodiment of the first aspect.

[0038] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect or a battery device provided by any embodiment of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0041] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0042] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0043] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0044] Figure 5 A schematic structural diagram of a first current collecting component provided in some embodiments of the present application;

[0045] Figure 6 An exploded view of a first current collecting member provided in some embodiments of the present application;

[0046] Figure 7 A cross-sectional view of a battery cell provided in some embodiments of the present application (two second connection parts);

[0047] Figure 8 An exploded view of a battery cell provided for some embodiments of the present application (showing that the first electrode terminal and the second electrode terminal are disposed on the same second wall portion);

[0048] Fig. 9 An exploded view of a battery cell provided for some embodiments of the present application (showing that the first electrode terminal and the second electrode terminal are respectively disposed on the two second wall portions);

[0049] Fig.10 A schematic diagram of the structure of a first current collecting component and a second current collecting component provided in some embodiments of the present application;

[0050] Fig.11 An exploded view of a battery cell provided for some embodiments of the present application (showing that both second wall portions are provided with second electrode terminals);

[0051] Fig.12 An exploded view of a battery cell provided in some other embodiments of the present application;

[0052] Fig.13 An exploded view of a battery cell provided for some embodiments of the present application (showing a first insulating member);

[0053] Fig.14 An exploded view of a battery cell provided for some embodiments of the present application (showing a through hole);

[0054] Fig.15 A schematic diagram of the structure of a battery cell provided for some embodiments of the present application (showing a separator);

[0055] Fig.16 A schematic diagram of assembling an electrode assembly and a separator provided in some embodiments of the present application;

[0056] Fig.17 An exploded view of a battery cell provided for some embodiments of the present application (showing a second insulating member);

[0057] Fig.18 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of the present application.

[0058] Icons: 1-housing; 11-housing; 12-end cover; 13-first wall; 14-second wall; 2-electrode assembly; 2a-electrode assembly group; 31-first electrode terminal; 32-second electrode terminal; 41-first current collecting member; 411-first connecting portion; 4111-first part; 4112-second part; 412-second connecting portion; 42-second current collecting member; 421-third connecting portion; 4211-third part; 4212-fourth part; 422-fourth connecting portion; 51-first pole ear; 52-second pole ear; 6-first insulating member; 61-through hole; 62-first surface; 63-second surface; 7-separator; 8-second insulating member;

[0059] 10-battery cell; 20-box; 201-first box; 202-second box;

[0060] 100 -battery device; 200 -controller; 300 -motor; 1000 -vehicle; X -first direction; Y -thickness direction of the second wall; Z -thickness direction of the first wall. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0063] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0064] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0066] The term “plurality” used in this application refers to two or more (including two).

[0067] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0068] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0069] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0070] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0074] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0078] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0081] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0082] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0084] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0085] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0086] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0087] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0088] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0089] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0090] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0091] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0092] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0093] In some embodiments, the electrode assembly is a laminate structure.

[0094] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0095] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0096] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0097] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0098] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0099] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0100] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0101] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0102] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0103] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0104] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0105] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0106] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0107] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0108] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0109] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0110] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0111] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0112] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0113] A battery cell may include a housing, an electrode terminal, an electrode assembly, and a current collecting member, wherein the electrode terminal is disposed in the housing, the electrode assembly is accommodated in the housing, the electrode assembly is provided with a tab, and the current collecting member connects the electrode terminal and the current collecting member. In the battery cell, the tab may be disposed toward the electrode terminal so that the electrode terminal and the tab are located on the same side of the electrode assembly. However, the electrode terminal and the tab are located on the same side of the electrode assembly, so that the connection area between the electrode terminal and the current collecting member and the connection area between the current collecting member and the tab are close, which increases the difficulty of connecting the current collecting member and the electrode terminal and the tab, and increases the risk of interference between the electrode terminal and the tab, making the battery cell more prone to failure, thereby reducing the service life of the battery cell.

[0114] In view of this, in order to improve the stability of a battery cell, an embodiment of the present application provides a battery cell, the battery cell comprising a housing, a first electrode terminal, a first current collecting member and a plurality of electrode assemblies. The housing comprises a first wall portion and a second wall portion arranged adjacent to each other. A plurality of electrode assemblies are accommodated in the housing, and along the thickness direction of the first wall portion, a first pole lug is arranged at the same end of the plurality of electrode assemblies. The first electrode terminal is arranged at the second wall portion. The first current collecting member is accommodated in the housing, and the first current collecting member is electrically connected to the first electrode terminal and each first pole lug.

[0115] By arranging the first pole lug at the same end of the plurality of electrode assemblies in the thickness direction of the first wall portion, and arranging the first electrode terminal on the second wall portion, the connection area between the first pole lug and the first current collecting member and the connection area between the first current collecting member and the first electrode terminal can be made to be away from each other, which is beneficial to reducing the difficulty of assembling the first current collecting member, the first electrode terminal and the first pole lug, improving the assembly quality between the first current collecting member, the first electrode terminal and the first pole lug, and reducing the risk of interference between the first electrode terminal and the first pole lug, thereby making the battery cell more stable during use and extending the service life of the battery cell.

[0116] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0117] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0118] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas 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, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000.

[0119] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0120] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0121] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a case 20 and a battery cell 10 . The case 20 is used to accommodate the battery cell 10 .

[0122] Among them, a closed space for accommodating the battery cell 10 is formed inside the box 20. The box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first box 201 and a second box 202, and the first box 201 and the second box 202 are buckled with each other. The first box 201 and the second box 202 can be in various shapes, such as a cuboid, a cylinder, etc. The first box 201 can be a hollow structure with one side open, and the second box 202 can also be a hollow structure with one side open. The open side of the second box 202 is buckled with the open side of the first box 201 to form a box 20 with a closed space. It is also possible that the first box 201 is a hollow structure with one side open, and the second box 202 is a plate-like structure. The second box 202 is buckled on the open side of the first box 201, so as to form a box 20 with a accommodating space.

[0123] In the battery device 100, there may be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 10 are both connected in series and in parallel. The battery modules may be formed by connecting the battery cells 10 in series, in parallel, or in a mixed connection, and then the battery modules are formed into a whole by connecting the battery cells in series, in parallel, or in a mixed connection, and then accommodated in the box 20. Alternatively, all the battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 10 is accommodated in the box 20.

[0124] In some embodiments, the battery device 100 may further include a busbar, through which multiple battery cells 10 may be electrically connected to each other, so as to realize series connection, parallel connection or mixed connection of multiple battery cells 10. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0125] Please refer to Figure 3 and Figure 4 , Figure 3 A schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application; Figure 4 An exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 may include a housing 1 and an electrode assembly 2, wherein the electrode assembly 2 is accommodated in the housing 1.

[0126] The housing 1 can also be used to contain electrolytes, such as electrolytes, etc. The housing 1 can also be made of a variety of materials, such as copper, iron, aluminum, steel or aluminum alloys, etc.

[0127] In some embodiments, the housing 1 may include a shell 11 and an end cover 12 , wherein the shell 11 has an opening and the end cover 12 closes the opening of the shell 11 .

[0128] The shell 11 is a component for accommodating the electrode assembly 2. The shell 11 may be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The shell 11 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 11 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0129] The end cap 12 is a component that closes the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the shell 11 together define a storage space for accommodating the electrode assembly 2, electrolyte, etc. The end cap 12 can be connected to the shell 11 by welding or crimping to close the opening of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0130] In the embodiment where an opening is formed at one end of the housing 11, one end cap 12 may be provided accordingly. In the embodiment where openings are formed at both ends of the housing 11, two end caps 12 may be provided accordingly, and the two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define an accommodating space.

[0131] The electrode assembly 2 may be a laminate structure or a winding structure.

[0132] In some embodiments, the battery cell 10 may further include an electrode terminal, which is disposed on the housing 1 and is used to electrically connect to the tab of the electrode assembly 2 to output the electrical energy of the battery cell 10. The electrode terminal may be disposed on the shell 11 of the housing 1 or on the end cover 12 of the housing 1. The electrode terminal and the tab may be directly connected, for example, the electrode terminal and the tab are welded. The electrode terminal and the tab may also be indirectly connected, for example, the electrode terminal and the tab are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0133] Please continue to refer to Figure 3 and Figure 4 . An embodiment of the present application provides a battery cell 10, including a shell 1, a first electrode terminal 31, a first current collecting member 41 and a plurality of electrode assemblies 2. The shell 1 includes a first wall portion 13 and a second wall portion 14 arranged adjacent to each other, and the area of ​​the outer surface of the first wall portion 13 is greater than the area of ​​the outer surface of the second wall portion 14. A plurality of electrode assemblies 2 are accommodated in the shell 1, and along the thickness direction Z of the first wall portion, a first pole ear 51 is provided at the same end of the plurality of electrode assemblies 2. The first electrode terminal 31 is provided at the second wall portion 14. The first current collecting member 41 is accommodated in the shell 1, and the first current collecting member 41 connects the first electrode terminal 31 and each first pole ear 51.

[0134] The first wall portion 13 may be one or more. Taking the first wall portion 13 as an example, the first wall portion 13 may be the end cover 12, or the first wall portion 13 may be a wall portion of the housing 11. Taking the first wall portion 13 as an example, the two first wall portions 13 may be the two end covers 12 of the housing 1; one of the first wall portions 13 may be the end cover 12, and the other first wall portion 13 may be the wall portion of the housing 11; or both first wall portions 13 may be the walls of the housing 11.

[0135] The second wall portion 14 may be one or more. In the embodiment where the second wall portion 14 is one, the second wall portion 14 may be the end cover 12 or one wall portion of the housing 11. In the embodiment where the second wall portion 14 is two, the two second wall portions 14 may be two end covers 12 of the housing 1; one of the second wall portions 14 may be the end cover 12 and the other second wall portion 14 may be the wall portion of the housing 11; or both second wall portions 14 may be the walls of the housing 11.

[0136] The area of ​​the outer surface of the first wall portion 13 is greater than the area of ​​the outer surface of the second wall portion 14, which means that the first wall portion 13 and the second wall portion 14 are two adjacent walls of the outer shell 1, and among the two walls, the area of ​​the first wall portion 13 exposed to the outer surface of the outer shell 1 is greater than the area of ​​the second wall portion 14 exposed to the outer surface of the outer shell.

[0137] The first wall portion 13 and the second wall portion 14 are arranged adjacent to each other, that is, the first wall portion 13 and the second wall portion 14 are two adjacent walls of the housing 1. It is possible that there is one first wall portion 13 and one second wall portion 14, and the first wall portion 13 and the second wall portion 14 are arranged adjacent to each other; it is also possible that there is one first wall portion 13 and multiple second wall portions 14, and one first wall portion 13 is arranged adjacent to multiple second wall portions 14; it is also possible that there are multiple first wall portions 13 and one second wall portion 14, and multiple first wall portions 13 are arranged adjacent to one second wall portion 14; it is also possible that there are multiple first wall portions 13 and multiple second wall portions 14, and one first wall portion 13 is arranged adjacent to at least one second wall portion 14.

[0138] For example, the outer shell 1 is cylindrical, and the outer shell 1 includes a cylindrical shell 11 and two disc-shaped end covers 12. The two end covers 12 can be the first wall portion 13, and the shell 11 can be the second wall portion 14; or one of the two end covers 12 can be the first wall portion 13, and the shell 11 can be the second wall portion 14.

[0139] For another example, the housing 1 is in the shape of a rectangular parallelepiped, and the housing 1 includes a shell 11 with an opening at one end and a plate-shaped end cover 12. The end cover 12 may be the first wall portion 13, and the housing 11 may have four walls disposed adjacent to the first wall portion 13; wherein the four walls disposed adjacent to the first wall portion 13 may all be the second wall portion 14; or part of the four walls disposed adjacent to the first wall portion 13 may be the second wall portion 14. The end cover 12 and the wall portion on the housing 11 disposed opposite to the end cover 12 may all be the first wall portion 13, and the housing 11 may have four walls disposed adjacent to the two first wall portions 13; wherein the four walls may all be the second wall portion 14, or part of the four walls may be the second wall portion 14.

[0140] There are multiple electrode assemblies 2, and each electrode assembly 2 is accommodated in the housing 1. The multiple electrode assemblies 2 may be arranged along the thickness direction Y of the second wall portion; or the multiple electrode assemblies 2 may be distributed in multiple rows and columns.

[0141] The first electrode tab 51 may be a positive electrode tab or a negative electrode tab.

[0142] The first electrode terminal 31 serves to input or output the electric energy of the battery cell 10, and its material can be various, such as copper, iron, aluminum, steel or aluminum alloy, etc. Exemplarily, the first electrode terminal 31 is insulated and installed on the second wall portion 14, that is, no electrical connection is formed between the first electrode terminal 31 and the second wall portion 14.

[0143] There may be one or more first electrode terminals 31. In an embodiment where there is one second wall portion 14, each first electrode terminal 31 is disposed on the second wall portion 14. In an embodiment where there are multiple second wall portions 14, each first electrode terminal 31 may be disposed on the same second wall portion 14, or multiple first electrode terminals 31 may be disposed on multiple second wall portions 14, respectively.

[0144] The first current collecting member 41 serves to connect the first electrode terminal 31 and each first electrode tab 51. The first electrode terminal 31 and each first electrode tab 51 are connected by the first current collecting member 41, thereby achieving electrical connection between the first electrode terminal 31 and the electrode assembly 2. The first current collecting member 41 can be made of a variety of materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0145] In the embodiment of the present application, by arranging the first pole lug 51 at the same end of the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, it is advantageous for the first current collecting member 41 to cooperate with each first pole lug 51, thereby reducing the difficulty of assembling the first current collecting member 41, and arranging the first electrode terminal 31 on the second wall portion 14, so that the first pole lug 51 and the first electrode terminal 31 can be respectively located on two adjacent sides of the electrode assembly 2, so that the connection area between the first pole lug 51 and the first current collecting member 41 and the connection area between the first current collecting member 41 and the first electrode terminal 31 can be farther apart, which is advantageous for reducing the difficulty of assembling the first current collecting member 41 and the first electrode terminal 31 and the first pole lug 51, and can reduce the risk of interference between the first electrode terminal 31 and the first pole lug 51, thereby making the battery cell 10 more stable during use and extending the service life of the battery cell 10. In particular, when the first electrode terminal 31 and the first electrode tab 51 are both welded to the first current collecting member 41, the mutual influence between the welding molten pool between the first electrode terminal 31 and the first current collecting member 41 and the welding molten pool between the first electrode tab 51 and the first current collecting member 41 can be effectively reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal 31 and the first electrode tab 51 connected to the first current collecting member 41. In addition, by arranging multiple electrode assemblies 2 in the outer shell 1, the number of electrode assemblies 2 accommodated in the outer shell 1 of the battery cell 10 is increased, thereby increasing the capacity of the battery cell 10. With a battery cell 10 using this structure, it is only necessary to arrange multiple electrode assemblies 2 in the outer shell 1, and connect each first pole ear 51 through the first current collecting member 41 to achieve the input or output of electric energy of a large-capacity battery cell 10. There is no need to arrange multiple first current collecting members 41 in the outer shell 1 to connect with multiple first pole ears 51, and there is no need to increase the thickness or volume of a single electrode assembly 2, thereby effectively reducing the manufacturing difficulty of the electrode assembly 2, thereby reducing the manufacturing difficulty of a large-capacity battery cell 10, which is beneficial to improving the production efficiency of the battery cell 10 and reducing the manufacturing cost of the battery cell 10.

[0146] In some embodiments, the battery cell 10 may further include a pressure relief mechanism, which is disposed on the housing 1 and is used to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a predetermined value.

[0147] Optionally, the pressure relief mechanism may be disposed on the end cover 12 or on the housing 11. Similarly, the pressure relief mechanism and the housing 1 may be an integrally formed structure or a separately formed structure. If the pressure relief mechanism and the housing 1 are an integrally formed structure, the pressure relief mechanism is an area on the housing 1 where a weak structure is formed, for example, an area on the housing 1 where a notched groove is provided. If the pressure relief mechanism and the housing 1 are a separate structure, the pressure relief mechanism may be connected to the housing 1 by welding or the like, and correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.

[0148] In some embodiments, please refer to Figure 3-Figure 6 , Figure 5 A schematic structural diagram of a first current collecting member 41 provided in some embodiments of the present application; Figure 6 An exploded view of a first current collecting member 41 provided for some embodiments of the present application. The first current collecting member 41 includes a first connection portion 411 and a second connection portion 412. At least a portion of the first connection portion 411 is disposed between the first wall portion 13 and the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, and the first connection portion 411 is connected to each first electrode tab 51. At least a portion of the second connection portion 412 is disposed between the second wall portion 14 and the plurality of electrode assemblies 2 along the thickness direction Y of the second wall portion, and the second connection portion 412 connects the first connection portion 411 and the first electrode terminal 31.

[0149] Along the thickness direction Z of the first wall portion, the first connection portion 411 may be entirely located between the first wall portion 13 and the plurality of electrode assemblies 2; or only a portion of the first connection portion 411 may be located between the first wall portion 13 and the plurality of electrode assemblies 2. There may be one first connection portion 411, which is connected to a plurality of first pole tabs 51; or there may be a plurality of first connection portions 411, each of which is connected to at least one first pole tab 51. It is understood that the first wall portion 13 and the second pole tab 52 are located on the same side of the electrode assembly 2.

[0150] Along the thickness direction Y of the second wall portion, the second connection portion 412 may be entirely located between the second wall portion 14 and the plurality of electrode assemblies 2, or only a portion of the second connection portion 412 may be located between the second wall portion 14 and the plurality of electrode assemblies 2. There may be one second connection portion 412, which connects the first connection portion 411 and the first electrode terminal 31; there may also be multiple second connection portions 412, each of which connects the first connection portion 411 and one first electrode terminal 31.

[0151] It can be understood that the multiple electrode assemblies 2 in this embodiment refer to all electrode assemblies 2 accommodated in the housing 1 of the battery cell 10 .

[0152] The first connection portion 411 and the second connection portion 412 may be connected by welding; or the first connection portion 411 and the second connection portion 412 may be integrally formed.

[0153] In this embodiment, by disposing at least a portion of the first connection portion 411 between the electrode assembly 2 and the first wall portion 13, it is convenient to connect the first connection portion 411 with each first pole tab 51, and it is convenient to reduce the assembly difficulty between the first connection portion 411 and the first pole tab 51, and at least a portion of the second connection portion 412 is disposed between the electrode assembly 2 and the second wall portion 14, which is convenient to connect the second connection portion 412 with the first electrode terminal 31, and it is convenient to reduce the assembly difficulty between the second connection portion 412 and the first electrode terminal 31. Therefore, adopting such a structure can reduce the assembly difficulty between the first current collecting member 41 and the first pole tab 51 and the first electrode terminal 31, thereby helping to reduce the assembly cost of the battery cell 10.

[0154] In some embodiments, please refer to Figure 3-Figure 6 . Multiple electrode assemblies 2 ( Figure 3 4 and 5. The first connecting portion 411 includes a first portion 4111 and a plurality of second portions 4112. The first portion 4111 extends along the thickness direction Y of the second wall portion; the plurality of second portions 4112 are spaced apart from the first portion 4111 along the thickness direction Y of the second wall portion, and each second portion 4112 is connected to at least one first pole lug 51.

[0155] The first part 4111 and the plurality of second parts 4112 may be separately provided and connected, for example, the first part 4111 and the plurality of second parts 4112 are welded and connected; or the first part 4111 and the plurality of second parts 4112 may be integrally formed.

[0156] The plurality of second portions 4112 are arranged along the arrangement direction of the plurality of electrode assemblies 2, and along the thickness direction Z of the first wall portion, the plurality of second portions 4112 are located on one side of the plurality of electrode assemblies 2 where the first pole tabs 51 are provided. Each second portion 4112 may be connected to only one first pole tab 51, or each second portion 4112 may be connected to a plurality of first pole tabs 51.

[0157] The first electrode tab 51 and the second portion 4112 can be connected in a variety of ways, such as welding, clamping, etc.

[0158] The first portion 4111 may be connected to the second connection portion 412 , or the second portion 4112 may be connected to the second connection portion 412 .

[0159] In this embodiment, by setting each second part 4112 to connect at least one first pole ear 51, the electrical connection between the first pole ear 51 and the first connecting portion 411 can be achieved. By setting multiple second parts 4112 at intervals with the first part 4111 along the thickness direction Y of the second wall portion, on the one hand, it is convenient to connect the second part 4112 with the first pole ear 51, thereby reducing the difficulty of assembling the first connecting portion 411 and the first pole ear 51. On the other hand, the multiple second parts 4112 set at intervals can reduce the material usage of the first connecting portion 411 and reduce the weight of the first connecting portion 411, which is beneficial to reducing the energy density of the battery cell 10.

[0160] In some embodiments, please refer to Figure 6 The first portion 4111, the second portion 4112 and the second connecting portion 412 are separately provided and connected.

[0161] The second connection part 412 may be one or more. In the embodiment where the second connection part 412 is one, the first part 4111 may connect the second connection part 412 and multiple second parts 4112, or the first part 4111 may connect multiple second parts 4112, and at least one second part 4112 may connect the second connection part 412. In the embodiment where the second connection part 412 is multiple, the first part 4111 may connect multiple second connection parts 412, or multiple second parts 4112 may connect multiple second connection parts 412 respectively; or the first part 4111 may connect a part of the multiple second connection parts 412, and another part of the multiple second connection parts 412 may connect the second part 4112.

[0162] In this embodiment, by separately disposing and connecting the first portion 4111, the second portion 4112, and the second connection portion 412, it is possible to reduce the difficulty of assembling the second portion 4112 and the first pole tab 51, and it is also possible to reduce the difficulty of assembling the second connection portion 412 and the first electrode terminal 31, which is conducive to the arrangement and installation of the first current collecting member 41. When assembling the battery cell 10, the first portion 4111, the second portion 4112, and the second connection portion 412 of the first current collecting member 41 are separately disposed, which is conducive to the connection between the second portion 4112 and the first pole tab 51 and the connection between the second connection portion 412 and the first electrode terminal 31, respectively, and reduces the difficulty of assembling the first current collecting member 41 and the first pole tab 51 and the first electrode terminal 31.

[0163] In some embodiments, the first portion 4111 , the second portion 4112 , and the second connecting portion 412 are integrally formed.

[0164] The first part 4111, the second part 4112 and the second connecting part 412 may be formed by bending a plate as a whole; or the first part 4111, the second part 4112 and the second connecting part 412 may be formed by injection molding a metal conductor as a whole, wherein the metal conductor may be copper, iron, aluminum, steel or aluminum alloy.

[0165] In this embodiment, by arranging the first part 4111, the second part 4112 and the second connecting portion 412 to be integrally formed, on the one hand, the connection strength between the first part 4111 and the second part 4112 can be improved, and the connection strength between the first part 4111 and the second connecting portion 412 can be improved, thereby reducing the risk of the first current collecting component 41 being damaged by external force. On the other hand, the integral forming of the first part 4111, the second part 4112 and the second connecting portion 412 is conducive to reducing the manufacturing difficulty of the first current collecting component 41.

[0166] In some embodiments, please refer to Figure 7 , Figure 7 A cross-sectional view of a battery cell 10 provided in some embodiments of the present application (two second connection portions 412). The housing 1 includes two second wall portions 14 arranged opposite to each other along the thickness direction Y of the second wall portion, the first wall portion 13 connects the two second wall portions 14, and each second wall portion 14 is provided with a first electrode terminal 31. The first current collecting member 41 includes two second connection portions 412, the first connection portion 411 connects the two second connection portions 412, and each second connection portion 412 is connected to one first electrode terminal 31.

[0167] The two second wall portions 14 are arranged opposite to each other along the thickness direction Y of the second wall portion. The first wall portion 13 may be one, and the first wall portion 13 connects the two second wall portions 14 ; or the first wall portion 13 may be two, and the two first wall portions 13 are arranged opposite to each other along the thickness direction Z of the first wall portion, and each first wall portion 13 connects two second wall portions 14 .

[0168] Each second wall portion 14 is provided with a first electrode terminal 31 , that is, there are two first electrode terminals 31 , and each second wall portion 14 is provided with one first electrode terminal 31 .

[0169] In this embodiment, by providing the first electrode terminals 31 on both second wall portions 14, on the one hand, the output or output of electric energy of the battery cell 10 can be achieved through any one of the first electrode terminals 31, making wiring more convenient; on the other hand, by connecting the two first electrode terminals 31 at the same time, the battery cell 10 can withstand a larger current input or output, reducing the risk of the electrode terminal being damaged.

[0170] In some embodiments, please refer to Figure 8 , Figure 8An exploded view of a battery cell 10 provided for some embodiments of the present application (showing that the first electrode terminal 31 and the second electrode terminal 32 are arranged on the same second wall portion 14). The outer shell 1 includes two second wall portions 14 arranged opposite to each other along the thickness direction Y of the second wall portion, and the first wall portion 13 connects the two second wall portions 14. Along the thickness direction Z of the first wall portion, the same end of the plurality of electrode assemblies 2 is provided with a second pole lug 52, and the first pole lug 51 and the second pole lug 52 have opposite polarities. The battery cell 10 also includes a second electrode terminal 32 and a second current collecting member 42. The second electrode terminal 32 and the first electrode terminal 31 are arranged on the same second wall portion 14. The second current collecting member 42 is accommodated in the outer shell 1, and the second current collecting member 42 electrically connects the second electrode terminal 32 and each second pole lug 52.

[0171] There may be only one first wall portion 13, and both second wall portions 14 are connected to the first wall portion 13, and along the thickness direction Z of the first wall portion, a second pole lug 52 is provided at one end of the plurality of electrode assemblies 2 facing the first wall portion 13. There may also be two first wall portions 13, and the two first wall portions 13 are arranged opposite to each other along the thickness direction Z of the first wall portion, and along the thickness direction Z of the first wall portion, a second pole lug 52 is provided at one end of the plurality of electrode assemblies 2 facing the same first wall portion 13.

[0172] The first electrode tab 51 may be a positive electrode tab, and the second electrode tab 52 may be a negative electrode tab; or the first electrode tab 51 may be a negative electrode tab, and the second electrode tab 52 may be a positive electrode tab.

[0173] Along the thickness direction Z of the first wall portion, the first electrode tab 51 and the second electrode tab 52 may be disposed at the same end of the electrode assembly 2 ; or the first electrode tab 51 and the second electrode tab 52 may be disposed at two opposite ends of the electrode assembly 2 .

[0174] Only one of the second wall portions 14 may be provided with the first electrode terminal 31 and the second electrode terminal 32 ; or both of the second wall portions 14 may be provided with the first electrode terminal 31 and the second electrode terminal 32 .

[0175] The second current collecting member 42 and the second electrode terminal 32 and the second current collecting member 42 and the second electrode tab 52 may be connected in a variety of ways, such as welding, clamping, bonding, etc.

[0176] In this embodiment, by arranging the second pole tab 52 at the same end of the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, it is convenient for the second current collecting member 42 to cooperate with each second pole tab 52, and the difficulty of assembling the second current collecting member 42 is reduced. Moreover, by arranging the second electrode terminal 32 at the second wall portion 14, the connection area between the second pole tab 52 and the second current collecting member 42 and the connection area between the second current collecting member 42 and the second electrode terminal 32 can be separated from each other, which is convenient for reducing the difficulty of assembling the second current collecting member 42 and the second pole tab 52, and can reduce the risk of interference between the second electrode terminal 32 and the second pole tab 52, and improve the stability of the battery cell 10. In particular, when the second electrode terminal 32 and the second pole tab 52 are both welded to the second current collecting member 42, the mutual influence between the welding molten pool of the second electrode terminal 32 and the second current collecting member 42 and the welding molten pool of the second pole tab 52 and the second current collecting member 42 can be effectively reduced, thereby facilitating the improvement of the assembly quality and stability of the second electrode terminal 32 and the second pole tab 52 connected to the second current collecting member 42. The first electrode terminal 31 and the second electrode terminal 32 are arranged on the same second wall portion 14, so that the first electrode terminal 31 and the second electrode terminal 32 share a space in the thickness direction Y of the second wall portion, which is beneficial to saving the space occupied by the battery cell 10 in the thickness direction Y of the second wall portion, thereby improving the space utilization of the battery cell 10 and helping to improve the volume energy density of the battery cell 10.

[0177] In some embodiments, please refer to Fig. 9 , Fig. 9 An exploded view of a battery cell 10 provided for some embodiments of the present application (showing that the first electrode terminal 31 and the second electrode terminal 32 are respectively arranged on the two second wall portions 14). The housing 1 includes two second wall portions 14 arranged opposite to each other along the thickness direction Y of the second wall portion, and the first wall portion 13 connects the two second wall portions 14. Along the thickness direction Z of the first wall portion, the same end of the plurality of electrode assemblies 2 is provided with a second pole lug 52, and the first pole lug 51 and the second pole lug 52 have opposite polarities. The battery cell 10 also includes a second electrode terminal 32 and a second current collecting member 42. The second electrode terminal 32 and the first electrode terminal 31 are respectively arranged on the two second wall portions 14. The second current collecting member 42 is accommodated in the housing 1, and the second current collecting member 42 electrically connects the second electrode terminal 32 and each second pole lug 52.

[0178] One second wall portion 14 may be provided with only one first electrode terminal 31 , and the other second wall portion 14 may be provided with only one second electrode terminal 32 ; or one second wall portion 14 may be provided with a plurality of first electrode terminals 31 , and the other second wall portion 14 may be provided with a plurality of second electrode terminals 32 .

[0179] In this embodiment, the first electrode terminal 31 and the second electrode terminal 32 are respectively disposed on the two second wall portions 14 so that the first electrode terminal 31 and the second electrode terminal 32 are far apart, thereby reducing the risk of interference between the first electrode terminal 31 and the second electrode terminal 32 and improving the reliability of the battery cell 10.

[0180] In some embodiments, please refer to Fig. 9 and Fig.10 , Fig.10 A schematic diagram of the structure of a first current collecting member 41 and a second current collecting member 42 provided for some embodiments of the present application. The second current collecting member 42 includes a third connection portion 421 and a fourth connection portion 422. At least a portion of the third connection portion 421 is disposed between the first wall portion 13 and the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, and the third connection portion 421 is connected to each second electrode tab 52. At least a portion of the fourth connection portion 422 is disposed between the second wall portion 14 and the plurality of electrode assemblies 2 along the thickness direction Y of the second wall portion, and the fourth connection portion 422 connects the third connection portion 421 and the second electrode terminal 32.

[0181] Along the thickness direction Z of the first wall portion, the third connection portion 421 may be entirely located between the first wall portion 13 and the plurality of electrode assemblies 2; or only a portion of the third connection portion 421 may be located between the first wall portion 13 and the plurality of electrode assemblies 2. There may be one third connection portion 421, which is connected to a plurality of second pole tabs 52; or there may be a plurality of third connection portions 421, each of which is connected to at least one second pole tab 52. It is understood that the first wall portion 13 and the second pole tab 52 are located on the same side of the electrode assembly 2.

[0182] Along the thickness direction Y of the second wall portion, the fourth connection portion 422 may be entirely located between the second wall portion 14 and the plurality of electrode assemblies 2, or only a portion of the fourth connection portion 422 may be located between the second wall portion 14 and the plurality of electrode assemblies 2. There may be one fourth connection portion 422, which connects the third connection portion 421 and the second electrode terminal 32; or there may be multiple fourth connection portions 422, each of which connects the third connection portion 421 and one second electrode terminal 32.

[0183] It can be understood that the multiple electrode assemblies 2 in this embodiment refer to all electrode assemblies 2 accommodated in the housing 1 of the battery cell 10 .

[0184] The third connection portion 421 and the fourth connection portion 422 may be connected by welding; or the third connection portion 421 and the fourth connection portion 422 may be integrally formed.

[0185] Along the thickness direction Z of the first wall portion, the first pole lug 51 and the second pole lug 52 may be both arranged at the same end of the electrode assembly 2, and the first connecting portion 411 and the third connecting portion 421 may be arranged at the end of the electrode assembly 2 where the first pole lug 51 and the second pole lug 52 are arranged; or the first pole lug 51 and the second pole lug 52 may be respectively arranged at two opposite ends of the electrode assembly 2, the first connecting portion 411 may be arranged at the end of the electrode assembly 2 where the first pole lug 51 is arranged, and the third connecting portion 421 may be arranged at the end of the electrode assembly 2 where the second pole lug 52 is arranged.

[0186] In this embodiment, by disposing at least a portion of the third connection portion 421 between the electrode assembly 2 and the first wall portion 13, it is convenient to connect the third connection portion 421 with each second pole tab 52, and it is convenient to reduce the difficulty of assembling the third connection portion 421 and the second pole tab 52, and at least a portion of the fourth connection portion 422 is disposed between the electrode assembly 2 and the second wall portion 14, which is convenient to connect the fourth connection portion 422 with the second electrode terminal 32, and it is convenient to reduce the difficulty of assembling the fourth connection portion 422 and the second electrode terminal 32. Therefore, adopting such a structure can reduce the difficulty of assembling the second current collecting member 42 with the second pole tab 52 and the second electrode terminal 32, thereby helping to reduce the assembly cost of the battery cell 10.

[0187] In some embodiments, please refer to Fig. 9 and Fig.10 The plurality of electrode assemblies 2 are arranged along the thickness direction Y of the second wall portion, and the third connecting portion 421 includes a third portion 4211 and a plurality of fourth portions 4212. The third portion 4211 extends along the thickness direction Y of the second wall portion. The plurality of fourth portions 4212 are spaced apart from the third portion 4211 along the thickness direction Y of the second wall portion, and each fourth portion 4212 is connected to at least one second electrode tab 52.

[0188] The third part 4211 and the plurality of fourth parts 4212 may be separately provided and connected, for example, the third part 4211 and the plurality of fourth parts 4212 are welded and connected; or the third part 4211 and the plurality of fourth parts 4212 may be integrally formed.

[0189] The plurality of fourth portions 4212 are arranged along the arrangement direction of the plurality of electrode assemblies 2, and along the thickness direction Z of the first wall portion, the plurality of fourth portions 4212 are located on one side of the plurality of electrode assemblies 2 where the second pole tabs 52 are arranged. Each fourth portion 4212 may be connected to only one second pole tab 52, or each fourth portion 4212 may be connected to a plurality of second pole tabs 52.

[0190] The second pole tab 52 and the fourth portion 4212 can be connected in a variety of ways, such as welding, clamping, etc.

[0191] The third portion 4211 may be connected to the fourth connection portion 422 , or the fourth portion 4212 may be connected to the fourth connection portion 422 .

[0192] In this embodiment, by setting each fourth part 4212 to connect at least one second pole ear 52, the electrical connection between the second pole ear 52 and the third connecting part 421 can be achieved. By setting multiple fourth parts 4212 at intervals with the third part 4211 along the thickness direction Y of the second wall portion, on the one hand, it is convenient to connect the fourth part 4212 with the second pole ear 52 and reduce the difficulty of assembling the third connecting part 421 and the second pole ear 52. On the other hand, the multiple fourth parts 4212 set at intervals can reduce the material usage of the third connecting part 421 and reduce the weight of the third connecting part 421, which is beneficial to reduce the energy density of the battery cell 10.

[0193] In some embodiments, please refer to Fig. 9 and Fig.10 The third portion 4211, the fourth portion 4212 and the fourth connecting portion 422 are separately provided and connected.

[0194] The fourth connection part 422 may be one or more. In the embodiment where the fourth connection part 422 is one, the third part 4211 may connect the fourth connection part 422 and multiple fourth parts 4212, or the third part 4211 may connect multiple fourth parts 4212, and at least one fourth part 4212 may connect the fourth connection part 422. In the embodiment where the fourth connection part 422 is multiple, the third part 4211 may connect multiple fourth connection parts 422, or multiple fourth parts 4212 may respectively connect multiple fourth connection parts 422; or the third part 4211 may connect a part of the multiple fourth connection parts 422, and another part of the multiple fourth connection parts 422 may connect the fourth part 4212.

[0195] In this embodiment, the difficulty of assembling the fourth portion 4212 and the second electrode tab 52 can be reduced, and the difficulty of assembling the fourth connection portion 422 and the second electrode terminal 32 can also be reduced, which is conducive to the arrangement and installation of the second current collecting member 42.

[0196] In some embodiments, the third portion 4211 , the fourth portion 4212 and the fourth connecting portion 422 are integrally formed.

[0197] The third part 4211, the fourth part 4212 and the fourth connecting part 422 may be formed by bending a plate as a whole; or the third part 4211, the fourth part 4212 and the fourth connecting part 422 may be formed by injection molding a metal conductor as a whole, wherein the metal conductor may be copper, iron, aluminum, steel or aluminum alloy.

[0198] In this embodiment, on the one hand, the connection strength between the third part 4211 and the fourth part 4212 and the connection strength between the third part 4211 and the fourth connecting part 422 can be improved, thereby reducing the risk of the second current collecting component 42 being damaged by external forces. On the other hand, the integral molding of the third part 4211, the fourth part 4212 and the fourth connecting part 422 is conducive to reducing the manufacturing difficulty of the second current collecting component 42.

[0199] In some embodiments, please refer to Fig.11 , Fig.11 An exploded view of a battery cell 10 provided for some embodiments of the present application (showing that both second wall portions 14 are provided with a second electrode terminal 32). There are two second wall portions 14, each of which is provided with a second electrode terminal 32. The second current collecting member 42 includes two fourth connection portions 422, the third connection portion 421 connects the two fourth connection portions 422, and each fourth connection portion 422 is connected to one second electrode terminal 32.

[0200] Each second wall portion 14 is provided with a second electrode terminal 32 , that is, there are two second electrode terminals 32 , and each second wall portion 14 is provided with one second electrode terminal 32 .

[0201] In this embodiment, by providing the second electrode terminals 32 on both second wall portions 14, on the one hand, the electric energy of the battery cell 10 can be input or output through any one of the second electrode terminals 32, making wiring more convenient; on the other hand, by connecting the two second electrode terminals 32 at the same time, the battery cell 10 can withstand a larger current input or output, reducing the risk of the electrode terminals being damaged.

[0202] In some embodiments, please refer to Figure 8There are two first wall portions 13, and the two first wall portions 13 are arranged opposite to each other along the thickness direction Z of the first wall portion. The first current collecting member 41 includes a first connection portion 411 and a second connection portion 412. The first connection portion 411 is connected to each first electrode tab 51. The second connection portion 412 connects the first connection portion 411 and the first electrode terminal 31. The second current collecting member 42 includes a third connection portion 421 and a fourth connection portion 422. At least a portion of the third connection portion 421 is arranged between the first wall portion 13 and the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, and the third connection portion 421 is connected to each second electrode tab 52. At least a portion of the fourth connection portion 422 is arranged between the second wall portion 14 and the plurality of electrode assemblies 2 along the thickness direction Y of the second wall portion, and the fourth connection portion 422 connects the third connection portion 421 and the second electrode terminal 32. Among them, along the thickness direction Z of the first wall portion, the first pole ear 51 and the second pole ear 52 are arranged at the same end of the multiple electrode assemblies 2, the first connecting portion 411 and the third connecting portion 421 are located on the same side of the multiple electrode assemblies 2, and along the thickness direction Z of the first wall portion, at least part of the first connecting portion 411 and at least part of the third connecting portion 421 are located between the same first wall portion 13 and the multiple electrode assemblies 2.

[0203] In the embodiment where there is one second connection portion 412, along the thickness direction Y of the second wall portion, the second connection portion 412 is connected to the first electrode terminal 31 disposed on one second wall portion 14, and the second connection portion 412 is disposed between the second wall portion 14 and the plurality of electrode assemblies 2. In the embodiment where there are two second connection portions 412, along the thickness direction Y of the second wall portion, the two second connection portions 412 are respectively connected to the first electrode terminals 31 disposed on the two second wall portions 14, and the two second connection portions 412 are respectively disposed between the second wall portion 14 disposed close thereto and the plurality of electrode assemblies 2.

[0204] In the embodiment where there is one fourth connection portion 422, along the thickness direction Y of the second wall portion, the fourth connection portion 422 is connected to the second electrode terminal 32 of one second wall portion 14, and the fourth connection portion 422 is disposed between the second wall portion 14 and the plurality of electrode assemblies 2. In the embodiment where there are two fourth connection portions 422, along the thickness direction Y of the second wall portion, the two fourth connection portions 422 are respectively connected to the second electrode terminals 32 of the two second wall portions 14, and the two fourth connection portions 422 are respectively disposed between the second wall portion 14 disposed close thereto and the plurality of electrode assemblies 2.

[0205] As an example, Figure 8As shown, the first electrode terminal 31 and the second electrode terminal 32 are both arranged on the same second wall portion 14, and the second wall portion 14 is the end cap 12. Along the thickness direction Z of the first wall portion, the first connection portion 411 and the third connection portion 421 are arranged at the same end of the electrode assembly 2. Along the thickness direction Y of the second wall portion, the second connection portion 412 and the fourth connection portion 422 are located between the end cap 12 and the plurality of electrode assemblies 2.

[0206] In the present embodiment, by arranging the first pole lug 51 and the second pole lug 52 at the same end of the plurality of electrode assemblies 2, and the first connecting portion 411 and the third connecting portion 421 are located on the same side of the plurality of electrode assemblies 2, on the one hand, it is convenient to connect the first current collecting member 41 with the first pole lug 51, and to connect the second current collecting member 42 with the second pole lug 52, which is beneficial to reduce the difficulty of assembling the first current collecting member 41 and the second current collecting member 42; on the other hand, the first current collecting member 41 and the second current collecting member 42 can share a space in the thickness direction Z of the first wall portion, which is beneficial to saving the space occupied by the first current collecting member 41 and the second current collecting member 42 in the thickness direction Z of the first wall portion, thereby improving the space utilization rate of the battery cell 10 and improving the volume energy density of the battery cell 10.

[0207] In some embodiments, there are two first wall portions 13, and the two first wall portions 13 are arranged opposite to each other along the thickness direction Z of the first wall portion, and the first current collecting member 41 includes a first connection portion 411 and a second connection portion 412. The first connection portion 411 is connected to each first electrode tab 51. The second connection portion 412 connects the first connection portion 411 and the first electrode terminal 31. The second current collecting member 42 includes a third connection portion 421 and a fourth connection portion 422. At least a portion of the third connection portion 421 is arranged between the first wall portion 13 and the plurality of electrode assemblies 2 along the thickness direction Z of the first wall portion, and the third connection portion 421 is connected to each second electrode tab 52. At least a portion of the fourth connection portion 422 is arranged between the second wall portion 14 and the plurality of electrode assemblies 2 along the thickness direction Y of the second wall portion, and the fourth connection portion 422 connects the third connection portion 421 and the second electrode terminal 32. Among them, along the thickness direction Z of the first wall portion, the first pole ear 51 and the second pole ear 52 are respectively arranged at opposite ends of the plurality of electrode assemblies 2, and the first connection portion 411 and the third connection portion 421 are respectively located at opposite sides of the plurality of electrode assemblies 2. Along the thickness direction Z of the first wall portion, at least a portion of the first connection portion 411 is located between one of the two first wall portions 13 and the plurality of electrode assemblies 2, and at least a portion of the third connection portion 421 is located between the other of the two first wall portions 13 and the plurality of electrode assemblies 2.

[0208] Along the thickness direction Z of the first wall portion, the first pole ear 51 is arranged at one end of the multiple electrode assemblies 2, and the first connecting portion 411 is located on the side of the multiple electrode assemblies 2 where the first pole ear 51 is arranged; the second pole ear 52 is arranged at the other end of the multiple electrode assemblies 2, and the third connecting portion 421 is located on the side of the multiple electrode assemblies 2 where the second pole ear 52 is arranged.

[0209] In the present embodiment, by respectively arranging the first pole tab 51 and the second pole tab 52 at opposite ends of the plurality of electrode assemblies 2, and respectively arranging the first connection portion 411 and the third connection portion 421 at both sides of the plurality of electrode assemblies 2 in the thickness direction Z of the first wall portion, on the one hand, it is convenient for the first current collecting member 41 and the second current collecting member 42 to be connected to the first pole tab 51 and the second pole tab 52 respectively, which is conducive to alleviating the mutual interference between the first current collecting member 41 and the second current collecting member 42; on the other hand, the first pole tab 51 and the second pole tab 52 with opposite polarities can be kept away from each other, and the first connection portion 411 of the first current collecting member 41 and the third connection portion 421 of the second current collecting member 42 can be kept away from each other, which is conducive to reducing the risk of short circuit between the first pole tab 51 and the second pole tab 52 and between the first current collecting member 41 and the second current collecting member 42, so as to improve the reliability of the battery cell 10.

[0210] In some embodiments, along the thickness direction Z of the first wall portion, the first pole ear 51 and the second pole ear 52 are arranged at the same end of the multiple electrode assemblies 2, and the first connecting portion 411 and the third connecting portion 421 are located on opposite sides of the multiple electrode assemblies 2 along the thickness direction Y of the second wall portion.

[0211] In some embodiments, please refer to Figure 8 The housing 1 includes two second wall portions 14 arranged opposite to each other along the thickness direction Y of the second wall portion. Along the thickness direction Y of the second wall portion, the second connection portion 412 and the fourth connection portion 422 are located on the same side of the plurality of electrode assemblies 2 , and the first electrode terminal 31 and the second electrode terminal 32 are arranged on the same second wall portion 14 .

[0212] Along the thickness direction Y of the second wall portion, the first electrode terminal 31 and the second electrode terminal 32 are disposed on the same second wall portion 14 of the two second wall portions 14, that is, the first electrode terminal 31 and the second electrode terminal 32 are located on the same side of the plurality of electrode assemblies 2. The second connection portion 412 and the fourth connection portion 422 may be located on one side of the plurality of electrode assemblies 2 close to the first electrode terminal 31 and the second electrode terminal 32.

[0213] By arranging the first electrode terminal 31 and the second electrode terminal 32 on the same second wall portion 14, and the second connection portion 412 and the fourth connection portion 422 are located on the same side of the plurality of electrode assemblies 2, on the one hand, it is convenient for the second connection portion 412 to be connected to the first electrode terminal 31, and for the fourth connection portion 422 to be connected to the second electrode terminal 32, and on the other hand, the battery cell 10 is configured such that the first electrode terminal 31 and the second electrode terminal 32 are provided at the same end in the thickness direction Y of the second wall portion, and the second connection portion 412 and the fourth connection portion 422 can share space in the thickness direction Y of the second wall portion, thereby improving the space utilization of the battery cell 10 and enhancing the volume energy density of the battery cell 10. In addition, in the battery cell 10 adopting this structure, the first electrode terminal 31 and the second electrode terminal 32 are arranged on the same second wall portion 14, so that the wall portion of the housing 1 facing the electrode assembly 2 along the thickness direction Z of the first wall portion is not provided with the first electrode terminal 31 and the second electrode terminal 32, thereby facilitating stacking of multiple battery cells 10 along the thickness direction Z of the first wall portion. On the other hand, it is possible to separate the area where the first current collecting member 41 is connected to the first electrode terminal 31 and the area where the first current collecting member 41 is connected to the first pole tab 51, and it is possible to separate the area where the second current collecting member 42 is connected to the second electrode terminal 32 and the area where the second current collecting member 42 is connected to the second pole tab 52, which is beneficial to reducing the difficulty of assembling the first current collecting member 41 with the first electrode terminal 31 and the first pole tab 51, and reducing the difficulty of assembling the second current collecting member 42 with the second electrode terminal 32 and the second pole tab 52, and it is possible to reduce the interference problem between the first electrode terminal 31 and the first pole tab 51 and between the second electrode terminal 32 and the second pole tab 52. In particular, when the first electrode terminal 31 and the first electrode tab 51 are both welded to the first current collecting member 41, and the second electrode terminal 32 and the second electrode tab 52 are both welded to the second current collecting member 42, the mutual influence between the welding molten pool of the first electrode terminal 31 and the first current collecting member 41 and the welding molten pool of the first electrode tab 51 and the first current collecting member 41 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 32 and the second current collecting member 42 and the welding molten pool of the second electrode tab 52 and the second current collecting member 42 can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal 31 and the first electrode tab 51 connected to the first current collecting member 41, and the second electrode terminal 32 and the second electrode tab 52 connected to the second current collecting member 42.

[0214] In some embodiments, please refer to Fig.12 , Fig.12The exploded view of the battery cell 10 provided in some embodiments of the present application. Along the thickness direction Y of the second wall portion, the second connection portion 412 and the fourth connection portion 422 are located on opposite sides of the plurality of electrode assemblies 2, and the first electrode terminal 31 and the second electrode terminal 32 are respectively disposed on the two second wall portions 14.

[0215] Only one first electrode terminal 31 may be provided on one second wall portion 14 , and the second connecting portion 412 may be provided between the second wall portion 14 and the plurality of electrode assemblies 2 ; only one second electrode terminal 32 may be provided on another second wall portion 14 , and the fourth connecting portion 422 may be provided between the second wall portion 14 and the plurality of electrode assemblies 2 . Alternatively, a plurality of first electrode terminals 31 may be arranged on a second wall portion 14, and a second connecting portion 412 may be arranged between the second wall portion 14 and a plurality of electrode assemblies 2, wherein the first electrode terminals 31 and the second connecting portions 412 may correspond one-to-one, or one first electrode terminal 31 may be connected to a plurality of second connecting portions 412, or a plurality of first electrode terminals 31 may be connected to one second connecting portion 412; a plurality of second electrode terminals 32 may be arranged on another second wall portion 14, and a fourth connecting portion 422 may be arranged between the second wall portion 14 and a plurality of electrode assemblies 2, wherein the second electrode terminals 32 and the fourth connecting portions 422 may correspond one-to-one, or one second electrode terminal 32 may be connected to a plurality of fourth connecting portions 422, or a plurality of second electrode terminals 32 may be connected to one fourth connecting portion 422.

[0216] By respectively arranging the first electrode terminal 31 and the second electrode terminal 32 on the two second wall portions 14 , and the second connection portion 412 and the fourth connection portion 422 being located on opposite sides of the plurality of electrode assemblies 2 , it is convenient to connect the second connection portion 412 to the first electrode terminal 31 , and to connect the fourth connection portion 422 to the second electrode terminal 32 . In addition, in the battery cell 10 adopting this structure, the first electrode terminal 31 and the second electrode terminal 32 are arranged on the two second wall portions 14, so that the wall portion of the housing 1 facing the electrode assembly 2 along the thickness direction Z of the first wall portion is not provided with the first electrode terminal 31 and the second electrode terminal 32, thereby facilitating stacking of multiple battery cells 10 along the thickness direction Z of the first wall portion. On the other hand, it is possible to separate the area where the first current collecting member 41 is connected to the first electrode terminal 31 and the area where the first current collecting member 41 is connected to the first pole tab 51, and it is possible to separate the area where the second current collecting member 42 is connected to the second electrode terminal 32 and the area where the second current collecting member 42 is connected to the second pole tab 52, which is beneficial to reducing the difficulty of assembling the first current collecting member 41 with the first electrode terminal 31 and the first pole tab 51, and reducing the difficulty of assembling the second current collecting member 42 with the second electrode terminal 32 and the second pole tab 52, and it is possible to reduce the interference problem between the first electrode terminal 31 and the first pole tab 51 and between the second electrode terminal 32 and the second pole tab 52. The first electrode terminal 31 and the second electrode terminal 32 are respectively disposed on the two second wall portions 14 , which can reduce the risk of interference between the first electrode terminal 31 and the second electrode terminal 32 .

[0217] In some embodiments, please refer to Fig.13 , Fig.13 An exploded view of a battery cell 10 provided for some embodiments of the present application (showing the first insulating member 6). Along the thickness direction Z of the first wall portion, the first connection portion 411 and the third connection portion 421 are located on the same side of the plurality of electrode assemblies 2. The battery cell 10 further includes a first insulating member 6, along the thickness direction Z of the first wall portion, a portion of the first insulating member 6 is disposed between the first wall portion 13 and the first current collecting member 41 to insulate and isolate the first wall portion 13 and the first current collecting member 41, and another portion of the first insulating member 6 is disposed between the first wall portion 13 and the second current collecting member 42 to insulate and isolate the first wall portion 13 and the second current collecting member 42.

[0218] The first connection portion 411 and the third connection portion 421 are located on the same side of the multiple electrode assemblies 2, and the first insulating member 6 is arranged between the first wall portion 13 and the first current collecting member 41, so that at least a portion of the first insulating member 6, the first connection portion 411 and the third connection portion 421 are all located on the same side of the multiple electrode assemblies 2.

[0219] The first insulating member 6 may include only a portion disposed between the first wall portion 13 and the first current collecting member 41 and a portion disposed between the first wall portion 13 and the second current collecting member 42; or the first insulating member 6 may include, in addition to a portion disposed between the first wall portion 13 and the first current collecting member 41 and a portion disposed between the first wall portion 13 and the second current collecting member 42, other portions, for example, another portion of the first insulating member 6 is disposed between the first current collecting member 41 and the first wall portion 13, and another portion of the first insulating member 6 is disposed between the second current collecting member 42 and the first wall portion 13.

[0220] The first insulating member 6 may be made of polyimide, polyetheretherketone, ceramic or the like.

[0221] In the present embodiment, a portion of the first insulating member 6 is disposed between the first wall portion 13 and the first current collecting member 41, and another portion of the first insulating member 6 is disposed between the first wall portion 13 and the second current collecting member 42, so that the first insulating member 6 is located between the first current collecting member 41, the second current collecting member 42 and the outer shell 1 in the thickness direction Z of the first wall portion. The battery cell 10 adopting such a structure can, on the one hand, achieve insulation isolation between the first current collecting member 41 and the outer shell 1 and between the second current collecting member 42 and the outer shell 1, which is beneficial to reducing the risk of short circuit between the first current collecting member 41 and the second current collecting member 42 and the outer shell 1; on the other hand, the first connecting portion 411 and the third connecting portion 421 can share a first insulating member 6, which is beneficial to optimizing the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10. In addition, the first connection part 411 and the third connection part 421 are located on the same side of the multiple electrode assemblies 2, which enables the first connection part 411 and the third connection part 421 to share part of the space along the thickness direction Z of the first wall portion, thereby improving the space utilization of the first connection part 411 and the third connection part 421, which is beneficial to improving the volume energy density of the battery cell 10.

[0222] In some embodiments, the battery cell 10 further includes a first insulating member 6 , at least part of which is disposed between the first wall 13 and the plurality of electrode assemblies 2 along a thickness direction Z of the first wall to insulate and isolate the first wall 13 and the plurality of electrode assemblies 2 .

[0223] Only a portion of the first insulating member 6 may be disposed between the first wall portion 13 and the plurality of electrode assemblies 2 ; or the entire first insulating member 6 may be disposed between the first wall portion 13 and the plurality of electrode assemblies 2 .

[0224] The plurality of first electrode tabs 51 may be disposed on the side of the plurality of electrode assemblies 2 facing the first insulating member 6, and at least a portion of the first current collecting member 41 may be disposed between the first wall portion 13 and the plurality of electrode assemblies 2. In particular, at least a portion of the first insulating member 6 may be located between the first wall portion 13 and the first current collecting member 41; or at least a portion of the first insulating member 6 may be located between the first current collecting member 41 and the plurality of electrode assemblies 2.

[0225] Alternatively, the plurality of first electrode tabs 51 may be disposed on a side of the plurality of electrode assemblies 2 away from the first insulating member 6, at least a portion of the first current collecting member 41 may be disposed on a side of the plurality of electrode assemblies 2 away from the first insulating member 6, and the first current collecting member 41 may be insulated from the outer casing 1 by other insulating members, for example, the other insulating members may be polyimide, polyetheretherketone or ceramic.

[0226] In this embodiment, at least a portion of the first insulating member 6 is located between the first wall portion 13 and the plurality of electrode assemblies 2 in the thickness direction Z of the first wall portion, which helps to reduce the risk of short circuit between the housing 1 and the plurality of electrode assemblies 2 .

[0227] In some embodiments, along the thickness direction Z of the first wall portion, the first insulating member 6 is at least partially disposed between the first wall portion 13 and the first current collecting member 41 to insulate and isolate the first wall portion 13 from the first current collecting member 41 .

[0228] The entire first insulating member 6 may be located between the first wall portion 13 and the plurality of electrode assemblies 2 ; or only a portion of the first insulating member 6 may be located between the first wall portion 13 and the plurality of electrode assemblies 2 .

[0229] In this embodiment, at least part of the first insulating member 6 is located between the first wall portion 13 and the first current collecting member 41 in the thickness direction Z of the first wall portion, which helps to reduce the risk of short circuit between the housing 1 and the first current collecting member 41 .

[0230] In some embodiments, please refer to Fig.14 , Fig.14 An exploded view of a battery cell 10 provided in some embodiments of the present application (showing a through hole 61 ) The first insulating member 6 is provided with a through hole 61 .

[0231] The first insulating member 6 may be provided with only one through hole 61 or may be provided with multiple through holes 61. The through hole 61 may penetrate the first insulating member 6 in any direction, for example, the through hole 61 penetrates the first insulating member 6 in the thickness direction Z of the first wall.

[0232] As an example, Fig.14As shown, the first insulating member 6 has a first surface 62 and a second surface 63 arranged opposite to each other along the thickness direction Z of the first wall portion, and there are multiple through holes 61 , and both ends of each through hole 61 extend to the first surface 62 and the second surface 63 .

[0233] In this embodiment, the through hole 61 is provided on the first insulating member 6, so that the weight of the first insulating member 6 can be reduced, thereby reducing the weight of the battery cell 10 and improving the mass energy density of the battery cell 10. When the through hole 61 penetrates the first insulating member 6 along the thickness direction Z of the first wall portion, the through hole 61 can guide the gas generated by the electrode assembly 2 to the side of the first insulating member 6 away from the electrode assembly 2 through the through hole 61, thereby facilitating the gas to be guided to the pressure relief mechanism provided in the housing 1, and the gas discharged from the battery cell 10 is immediately discharged through the pressure relief mechanism, which is conducive to reducing the risk of thermal runaway of the battery cell 10.

[0234] In some embodiments, the plurality of electrode assemblies 2 are arranged along the thickness direction Y of the second wall portion.

[0235] The plurality of electrode assemblies 2 are arranged along the thickness direction Y of the second wall portion so that the first electrode tabs 51 are arranged along the thickness direction Y of the second wall portion, and the first current collecting member 41 is disposed along the thickness direction Y of the second wall portion to facilitate connecting the first electrode tabs 51 .

[0236] By arranging the plurality of electrode assemblies 2 along the thickness direction Y of the second wall portion, it is convenient to connect the first current collecting member 41 with each first electrode tab 51 , thereby reducing the difficulty of assembling the first current collecting member 41 and the plurality of electrode assemblies 2 .

[0237] In some embodiments, please refer to Fig.15 and Fig.16 , Fig.15 A schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application (showing a separator 7); Fig.16 Schematic diagram of assembly of electrode assembly 2 and separator 7 provided in some embodiments of the present application. Battery cell 10 further includes at least one separator 7, which separates multiple electrode assemblies 2 into multiple electrode assembly groups 2a, each electrode assembly group 2a including at least one electrode assembly 2.

[0238] There may be only one separator 7, and one separator 7 separates the multiple electrode assemblies 2 into two electrode assembly groups 2a; there may also be multiple separators 7, and multiple separators 7 separate the multiple electrode assemblies 2 into multiple electrode assembly groups 2a. There may be only one electrode assembly 2 in each electrode assembly group 2a, or there may be multiple electrode assemblies 2. In the embodiment where there are multiple separators 7, one separator 7 among the multiple separators 7 may be located at one end of the multiple electrode assemblies 2 along the thickness direction Y of the second wall portion; or there may be electrode assemblies 2 on both sides of each separator 7. The separator 7 may be made of an insulating material, such as polyimide, polyphenylene sulfide, silicon nitride, aluminum nitride, aluminum oxide, ceramic, etc.

[0239] The separator 7 separates the multiple electrode assemblies 2 , and the separator 7 can reduce the risk of interference between the electrode assemblies 2 on both sides along the thickness direction Y of the second wall portion, thereby enhancing the insulation performance between the multiple electrode assemblies 2 .

[0240] In some embodiments, please refer to Fig.15 and Fig.16 There are multiple separators 7, and electrode assembly groups 2a are arranged on both sides of each separator 7.

[0241] Along the thickness direction Y of the second wall portion, the number of electrode assemblies 2 between two adjacent separators 7 may be equal or unequal. Fig.16 As shown, there are four separators 7 , and the four separators 7 separate the plurality of electrode assemblies 2 into five electrode assembly groups 2 a , each electrode assembly group 2 a having four electrode assemblies 2 .

[0242] By arranging electrode assembly groups 2a on both sides of each separator 7, the separator 7 serves to separate the multiple electrode assembly groups 2a, so as to reduce the risk of expansion stress accumulation of the electrode assemblies 2 of adjacent electrode assembly groups 2a, which may cause the electrode assemblies 2 to be squeezed and deformed against each other, thereby effectively improving the reliability of the battery cell 10.

[0243] In some embodiments, at least a portion of the separator 7 is a phase change material.

[0244] The separator 7 may be entirely made of phase change material, or only a portion of the separator 7 may be made of phase change material. As an example, the separator 7 includes a shell portion, and the phase change material is sealed in the shell portion. The shell portion may be a high temperature resistant insulating material, such as polyimide, polyphenylene sulfide, etc. The phase change material may be stearic acid, paraffin, magnesium salt solution, etc.

[0245] In this embodiment, during the use of the battery cell 10, the heat generated by the electrode assembly 2 in the battery cell 10 can be absorbed by the phase change material through the shell, thereby reducing the risk of thermal runaway of the electrode assembly 2 due to excessive temperature. When the battery cell 10 is not in use, the internal temperature of the battery cell 10 decreases, and the temperature of the phase change material also decreases, which makes it easier for the phase change material to absorb the heat of the electrode assembly 2 when the electrode assembly 2 generates heat later.

[0246] In some embodiments, please refer to Fig.17 , Fig.17 An exploded view of a battery cell 10 provided in some embodiments of the present application (showing a second insulating member 8). The battery cell 10 further includes a second insulating member 8, a receiving space is formed inside the second insulating member 8, and an opening is formed at at least one end of the receiving space along the thickness direction Z of the first wall portion, and a plurality of electrode assemblies 2 are received in the receiving space.

[0247] The accommodation space of the second insulating member 8 may form an opening at one end or at both ends. Multiple electrode assemblies 2 are accommodated in the accommodation space. The second insulating member 8 may be a packaging film. The second insulating member 8 may also be used to hold electrolyte. The first insulating member 6 and the second insulating member 8 may jointly cover the multiple electrode assemblies 2 and the first pole ears 51 and the second pole ears 52 provided on the multiple electrode assemblies 2, thereby reducing the risk of interference between the multiple electrode assemblies 2 and the housing 1.

[0248] By accommodating the plurality of electrode assemblies 2 in the accommodating space of the second insulating member 8 , the second insulating member 8 can insulate and isolate the outer shell 1 and the plurality of electrode assemblies 2 , thereby reducing the risk of short circuit between the outer shell 1 and the plurality of electrode assemblies 2 .

[0249] In some embodiments, the capacity of the battery cell 10 is greater than or equal to 1000 Ah.

[0250] The capacity of the battery cell 10 may be 1000Ah, 1500Ah, 2000Ah, 2500Ah, 3000Ah, 3500Ah, 4000Ah, 4500Ah, 5000Ah, 5500Ah, 6000Ah, 6500Ah, 7000Ah, etc.

[0251] In this embodiment, the battery cell 10 has a large capacity, which improves the performance of the battery cell 10. In the energy storage device, a plurality of battery cells 10 are usually stored in the battery device 100, so that the battery device 100 has a large capacity; and then a plurality of battery devices 100 are stored in the energy storage device to form an energy storage device with a large capacity. By setting the capacity of the battery cell 10 to be greater than or equal to 1000Ah, the electric capacity of a single battery cell 10 can be increased, so that a single battery cell 10 can have the electric capacity of a single battery device 100, or even a single battery cell 10 has an electric capacity exceeding that of a single battery device 100. Such a battery cell 10 saves the use of the outer shell 1, the current collecting member and various insulating parts of the battery cell 10 in terms of structure compared with the battery device 100, thereby improving the mass energy density of the battery cell 10, and such a structure enables the battery cell 10 to have a larger space to accommodate the electrode assembly 2 while having the same volume as the battery device 100, thereby improving the mass energy density of the battery cell 10.

[0252] In some embodiments, the number of electrode assemblies 2 is greater than or equal to four.

[0253] The number of electrode assemblies 2 can be 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or more.

[0254] The multiple electrode assemblies 2 in the housing 1 may be distributed in an array, and the multiple electrode assemblies 2 may be arranged in one row or in multiple rows, with multiple electrode assemblies 2 in each row of electrode assemblies 2. The electrode assemblies 2 may be a laminated structure or a wound structure.

[0255] By setting the number of electrode assemblies 2 to be greater than or equal to 4, the capacity of the battery cell 10 can be increased by increasing the number of electrode assemblies 2 while the volume of the electrode assemblies 2 remains unchanged, thereby obtaining a battery cell 10 with a larger capacity by increasing the number of electrode assemblies 2. Compared with obtaining a larger battery capacity by increasing the number of battery cells 10, the battery cell 10 obtained by increasing the number of electrode assemblies 2 can save the use of battery cell housings, insulating parts, etc. Under the condition of the same battery capacity, such a battery cell 10 can have a higher volume energy density and a lower production cost, which helps to improve the performance of the battery cell 10.

[0256] In some embodiments, the first wall portion 13 is the wall portion with the largest outer surface area in the housing 1 .

[0257] The housing 1 may include only the first wall portion 13 and the second wall portion 14, and the outer surface area of ​​the first wall portion 13 is larger than the outer surface area of ​​the second wall portion 14; the housing 1 may also include other walls, and the outer surface area of ​​the first wall portion 13 is also larger than the outer surface area of ​​the other walls.

[0258] In this embodiment, the first pole ear 51 is arranged at the same end of the electrode assembly 2 along the thickness direction Z of the first wall portion. On the one hand, the first pole ear 51 can face the wall portion of the outer shell 1 with the largest outer surface area, which reduces the difficulty of connecting the first pole ear 51 with the first current collecting member 41. On the other hand, when a plurality of battery cells 10 are stacked along the thickness direction Z of the first wall portion, the first wall portions 13 of the plurality of battery cells 10 are stacked, so that the stacking of the plurality of battery cells 10 is more stable and the placement of the battery cells 10 is more stable.

[0259] In some embodiments, please refer to Fig.18 , Fig.18 The schematic diagram of the structure of the battery cell 10 provided in some embodiments of the present application. The outer shell 1 is in the shape of a rectangular parallelepiped, and the size of the outer shell 1 along the thickness direction Z of the first wall is L1, and the size of the outer shell 1 along the first direction X is L2. The first direction X, the thickness direction Z of the first wall, and the thickness direction Y of the second wall are perpendicular to each other, and L2 / L1≥2.

[0260] The ratio of L2 / L1 can be any one of the point values ​​of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or any point value between any two of them.

[0261] In this embodiment, by setting L2 / L1≥2, the dimension of the outer shell 1 along the thickness direction Z of the first wall portion is smaller than the dimension of the outer shell 1 along the first direction X, so that the dimension of the electrode assembly 2 along the thickness direction Z of the first wall portion is smaller than the dimension of the electrode assembly 2 along the first direction X, and the first pole ear 51 of the electrode assembly 2 is arranged along the thickness direction Z of the first wall portion, so that the distance between the electrode assembly 2 and the first pole ear 51 is closer, which facilitates the input or output of electrical energy of the first pole ear 51 to the electrode assembly 2, thereby improving the performance of the battery cell 10.

[0262] In some embodiments, please refer to Fig.17 The housing 1 comprises a shell 11 and an end cover 12 . The shell 11 has an opening, and the end cover 12 closes the opening. The shell 11 comprises a first wall portion 13 , and the second wall portion 14 is the end cover 12 .

[0263] The housing 1 may include only one end cover 12, which is the second wall portion 14. The housing 1 may also include two end covers 12, which are arranged opposite to each other along the thickness direction Y of the second wall portion, and both end covers 12 may be the second wall portion 14; or one of the two end covers 12 may be the second wall portion 14.

[0264] The housing 1 may include two end covers 12, and any wall of the housing 11 may be connected to the two end covers 12. Only one wall of the housing 11 may be the second wall 14, or both walls of the housing 11 that are oppositely arranged along the thickness direction Y of the second wall may be the second wall 14.

[0265] By configuring the housing 11 to include the first wall portion 13 and the second wall portion 14 to be the end cover 12 , it is convenient to install the first electrode terminal 31 on the second wall portion 14 , thereby reducing the difficulty of installing the battery cell 10 .

[0266] An embodiment of the present application provides a battery device 100, including a battery cell 10 provided by any one of the above embodiments.

[0267] An embodiment of the present application provides an electrical device, including a battery cell 10 provided by any one of the above embodiments or a battery device 100 provided by any one of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0268] Please continue to refer to Fig.17The embodiment of the present application provides a battery cell 10, which includes a housing 1, a first electrode terminal 31, a second electrode terminal 32, a first current collecting member 41, a second current collecting member 42 and a plurality of electrode assemblies 2. The housing 1 includes a first wall portion 13 and a second wall portion 14 arranged adjacent to each other, and the second wall portion 14 is two, and the two second wall portions 14 are arranged opposite to each other along the thickness direction Y of the second wall portion, and the two second wall portions 14 are arranged adjacent to the first wall portion 13. A plurality of electrode assemblies 2 are accommodated in the housing 1, and along the thickness direction Z of the first wall portion, a first pole tab 51 and a second pole tab 52 are arranged at one end of the plurality of electrode assemblies 2 facing the first wall portion 13, and the first pole tab 51 and the second pole tab 52 have opposite polarities. A first electrode terminal 31 and a second electrode terminal 32 are arranged on each second wall portion 14. The first current collecting member 41 is accommodated in the housing 1, and the first current collecting member 41 electrically connects the two first electrode terminals 31 and each first pole tab 51. The second current collecting member 42 is accommodated in the housing 1, and the second current collecting member 42 electrically connects the two second electrode terminals 32 and each second electrode tab 52. The battery cell 10 also includes a first insulating member 6, a second insulating member 8 and a plurality of separators 7. Along the thickness direction Z of the first wall portion, a portion of the first insulating member 6 is disposed between the first wall portion 13 and the first current collecting member 41 to insulate and isolate the first wall portion 13 and the first current collecting member 41, and another portion of the first insulating member 6 is disposed between the first wall portion 13 and the second current collecting member 42 to insulate and isolate the first wall portion 13 and the second current collecting member 42. An accommodating space is formed inside the second insulating member 8, and an opening is formed at one end of the accommodating space facing the first wall portion 13 along the thickness direction Z of the first wall portion. A plurality of electrode assemblies 2 are accommodated in the accommodating space, and the second insulating member 8 is used to insulate and isolate the housing 1 and the plurality of electrode assemblies 2. The plurality of separators 7 separate the plurality of electrode assemblies 2 into a plurality of electrode assembly groups 2a, each electrode assembly group 2a includes at least one electrode assembly 2, and the number of electrode assemblies 2 in each electrode assembly group 2a is equal.

[0269] By arranging the first pole lug 51 at one end of the plurality of electrode assemblies 2 facing the first wall portion 13, it is facilitated that the first current collecting member 41 cooperates with each first pole lug 51, thereby reducing the difficulty of assembling the first current collecting member 41. By arranging the first electrode terminal 31 on the second wall portion 14, the connection area between the first pole lug 51 and the first current collecting member 41 and the connection area between the first current collecting member 41 and the first electrode terminal 31 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 41, the first electrode terminal 31 and the first pole lug 51, and can reduce the risk of interference between the first electrode terminal 31 and the first pole lug 51, thereby improving the stability of the battery cell 10. By arranging the second pole lug 52 at one end of the plurality of electrode assemblies 2 facing the first wall portion 13 along the thickness direction Z of the first wall portion, it is beneficial for the second current collecting member 42 to cooperate with each second pole lug 52, thereby reducing the difficulty of assembling the second current collecting member 42, and arranging the second electrode terminal 32 on the second wall portion 14, so that the connection area between the second pole lug 52 and the second current collecting member 42 and the connection area between the second current collecting member 42 and the second electrode terminal 32 can be separated from each other, which is beneficial for reducing the difficulty of assembling the second current collecting member 42 and the second electrode terminal 32 as well as the second pole lug 52, and can reduce the risk of interference between the second electrode terminal 32 and the second pole lug 52, thereby improving the stability of the battery cell 10. In particular, when the first electrode terminal 31 and the first electrode tab 51 are both welded to the first current collecting member 41, and the second electrode terminal 32 and the second electrode tab 52 are both welded to the second current collecting member 42, the mutual influence between the welding molten pool of the first electrode terminal 31 and the first current collecting member 41 and the welding molten pool of the first electrode tab 51 and the first current collecting member 41 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 32 and the second current collecting member 42 and the welding molten pool of the second electrode tab 52 and the second current collecting member 42 can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal 31 and the first electrode tab 51 connected to the first current collecting member 41, and the second electrode terminal 32 and the second electrode tab 52 connected to the second current collecting member 42. The first electrode terminal 31 and the second electrode terminal 32 are arranged on the same second wall portion 14, so that the first electrode terminal 31 and the second electrode terminal 32 share a space in the thickness direction Y of the second wall portion, which is conducive to saving the space occupied by the battery cell 10 in the thickness direction Y of the second wall portion, thereby improving the space utilization rate of the battery cell 10 and helping to improve the volume energy density of the battery cell 10. The arrangement of the first insulating member 6 can achieve insulation isolation between the first current collecting member 41 and the housing 1 and between the second current collecting member 42 and the housing 1, which is conducive to reducing the risk of short circuit between the first current collecting member 41 and the second current collecting member 42 and the housing 1. On the other hand, it can achieve that the first connecting portion 411 and the third connecting portion 421 share a first insulating member 6, which is conducive to optimizing the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10.By accommodating the plurality of electrode assemblies 2 in the accommodation space of the second insulating member 8, the second insulating member 8 can insulate and isolate the housing 1 and the plurality of electrode assemblies 2, thereby reducing the risk of short circuit between the housing 1 and the plurality of electrode assemblies 2. The plurality of electrode assemblies 2 are separated by the separator 7, and the separator 7 can reduce the risk of interference between the electrode assemblies 2 on both sides thereof along the thickness direction Y of the second wall portion.

[0270] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0271] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, It is characterized in that include: The housing comprises a first wall portion and a second wall portion which are adjacent to each other, wherein an outer surface area of ​​the first wall portion is larger than an outer surface area of ​​the second wall portion; A plurality of electrode assemblies are accommodated in the housing, and a first electrode tab is disposed at the same end of the plurality of electrode assemblies along the thickness direction of the first wall portion; A first electrode terminal is disposed on the second wall portion; A first current collecting member is accommodated in the outer case, and the first current collecting member connects the first electrode terminal and each of the first electrode tabs.

2. The battery cell according to claim 1, It is characterized in that The first current collecting member comprises: A first connecting portion, at least partially disposed along a thickness direction of the first wall portion between the first wall portion and the plurality of electrode assemblies, the first connecting portion being connected to each of the first electrode tabs; The second connection portion is at least partially disposed between the second wall portion and the plurality of electrode assemblies along a thickness direction of the second wall portion, and the second connection portion connects the first connection portion and the first electrode terminal.

3. The battery cell according to claim 2, It is characterized in that The plurality of electrode assemblies are arranged along the thickness direction of the second wall portion, and the first connecting portion includes: a first portion extending along a thickness direction of the second wall portion; A plurality of second portions are arranged at intervals on the first portion along a thickness direction of the second wall portion, and each of the second portions is connected to at least one of the first tabs.

4. The battery cell according to claim 3, It is characterized in that The first portion, the second portion and the second connecting portion are integrally arranged and connected.

5. The battery cell according to claim 3, It is characterized in that The first portion, the second portion and the second connecting portion are integrally formed.

6. The battery cell according to claim 2, It is characterized in that The housing comprises two second wall portions which are arranged opposite to each other along the thickness direction of the second wall portion, the first wall portion connects the two second wall portions, and each second wall portion is provided with the first electrode terminal; The first current collecting member includes two second connection parts, the first connection part connects the two second connection parts, and each of the second connection parts connects one of the first electrode terminals.

7. The battery cell according to any one of claims 1 to 6, It is characterized in that The housing comprises two second wall portions arranged opposite to each other along the thickness direction of the second wall portion, and the first wall portion connects the two second wall portions; along the thickness direction of the first wall portion, a second pole lug is arranged at the same end of the plurality of electrode assemblies, and the first pole lug has opposite polarity to the second pole lug; The battery cell further comprises: A second electrode terminal is disposed on the same second wall portion as the first electrode terminal, or is disposed on two second wall portions respectively with the first electrode terminal; The second current collecting member is accommodated in the outer case, and the second current collecting member electrically connects the second electrode terminal and each of the second electrode tabs.

8. The battery cell according to claim 7, It is characterized in that The second current collecting member comprises: A third connection portion, at least partially disposed along the thickness direction of the first wall portion between the first wall portion and the plurality of electrode assemblies, the third connection portion being connected to each of the second electrode tabs; The fourth connection portion is at least partially disposed between the second wall portion and the plurality of electrode assemblies along a thickness direction of the second wall portion, and the fourth connection portion connects the third connection portion and the second electrode terminal.

9. The battery cell according to claim 8, It is characterized in that The plurality of electrode assemblies are arranged along the thickness direction of the second wall portion, and the third connecting portion comprises: a third portion extending along a thickness direction of the second wall portion; A plurality of fourth portions are arranged at intervals on the third portion along a thickness direction of the second wall portion, and each of the fourth portions is connected to at least one of the second pole tabs.

10. The battery cell according to claim 9, It is characterized in that The third portion, the fourth portion and the fourth connecting portion are arranged integrally and connected.

11. The battery cell according to claim 9, It is characterized in that The third portion, the fourth portion and the fourth connecting portion are integrally formed.

12. The battery cell according to claim 8, It is characterized in that Each of the second wall portions is provided with the second electrode terminal; The second current collecting member includes two fourth connection parts, the third connection part connects the two fourth connection parts, and each of the fourth connection parts is connected to one second electrode terminal.

13. The battery cell according to claim 8, It is characterized in that There are two first wall portions, which are arranged opposite to each other along a thickness direction of the first wall portion, and the first current collecting member includes: A first connecting portion connected to each of the first pole tabs; a second connection portion connecting the first connection portion and the first electrode terminal; Among them, along the thickness direction of the first wall portion, the first pole ear and the second pole ear are arranged at the same end of the multiple electrode assemblies, the first connecting portion and the third connecting portion are located on the same side of the multiple electrode assemblies, and at least part of the first connecting portion and at least part of the third connecting portion are both located between the same first wall portion and the multiple electrode assemblies; or, along the thickness direction of the first wall portion, the first pole ear and the second pole ear are respectively arranged at opposite ends of the multiple electrode assemblies, the first connecting portion and the third connecting portion are respectively located on opposite sides of the multiple electrode assemblies, at least part of the first connecting portion is located between one of the two first wall portions and the multiple electrode assemblies, and at least part of the third connecting portion is between the other of the two first wall portions and the multiple electrode assemblies.

14. The battery cell according to claim 13, It is characterized in that Along the thickness direction of the second wall portion, the second connecting portion and the fourth connecting portion are located on the same side of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are arranged on the same second wall portion; or, along the thickness direction of the second wall portion, the second connecting portion and the fourth connecting portion are located on opposite sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively arranged on two second wall portions.

15. The battery cell according to claim 13, It is characterized in that Along the thickness direction of the first wall portion, the first connection portion and the third connection portion are located on the same side of the plurality of electrode assemblies; The battery cell also includes a first insulating member, and along the thickness direction of the first wall portion, a portion of the first insulating member is arranged between the first wall portion and the first current collecting member to insulate and isolate the first wall portion and the first current collecting member, and another portion of the first insulating member is arranged between the first wall portion and the second current collecting member to insulate and isolate the first wall portion and the second current collecting member.

16. The battery cell according to any one of claims 1 to 6, It is characterized in that The battery cell further includes a first insulating member. Along a thickness direction of the first wall portion, at least a portion of the first insulating member is disposed between the first wall portion and the plurality of electrode assemblies to insulate and isolate the first wall portion from the plurality of electrode assemblies.

17. The battery cell according to claim 16, It is characterized in that The first insulating member is at least partially disposed between the first wall portion and the first current collecting member along a thickness direction of the first wall portion to insulate and isolate the first wall portion from the first current collecting member.

18. The battery cell according to claim 16, It is characterized in that The first insulating member is provided with a through hole.

19. The battery cell according to any one of claims 1 to 6, It is characterized in that The plurality of electrode assemblies are arranged along the thickness direction of the second wall portion.

20. The battery cell according to claim 19, It is characterized in that The battery cell further includes at least one separator that separates the plurality of electrode assemblies into a plurality of electrode assembly groups, each of the electrode assembly groups including at least one electrode assembly.

21. The battery cell according to claim 20, It is characterized in that There are a plurality of separators, and the electrode assembly groups are disposed on both sides of each separator.

22. The battery cell according to claim 20, It is characterized in that At least a portion of the separator is a phase change material.

23. The battery cell according to any one of claims 1 to 6, It is characterized in that The battery cell further includes a second insulating member, a receiving space is formed inside the second insulating member, and an opening is formed at at least one end of the receiving space along the thickness direction of the first wall portion, and the plurality of electrode assemblies are received in the receiving space.

24. The battery cell according to any one of claims 1 to 6, It is characterized in that The capacity of the battery cell is greater than or equal to 1000 Ah.

25. The battery cell according to any one of claims 1 to 6, It is characterized in that The number of the electrode assemblies is greater than or equal to 4.

26. The battery cell according to any one of claims 1 to 6, It is characterized in that The first wall portion is a wall portion of the housing having the largest outer surface area.

27. The battery cell according to any one of claims 1 to 6, It is characterized in that The shell is in a rectangular shape, and along the thickness direction of the first wall portion, the size of the shell is L 1 , along the first direction, the size of the housing is L 2 , the first direction, the thickness direction of the first wall portion, and the thickness direction of the second wall portion are perpendicular to each other, L 2 / L 1 ≥2.

28. The battery cell according to any one of claims 1 to 6, It is characterized in that The housing comprises a shell and an end cover, the shell has an opening, and the end cover closes the opening; The housing includes the first wall portion, and the second wall portion is the end cover.

29. A battery device, It is characterized in that Comprising a battery cell as claimed in any one of claims 1 to 28.

30. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 28 or a battery device as claimed in claim 29, wherein the battery cell is used to provide electrical energy to the electrical device.

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