Battery monomer, battery, power utilization device and energy storage cabinet

Abstract

The invention provides a battery monomer, a battery, a power utilization device and an energy storage cabinet, and belongs to the technical field of batteries. A battery cell includes a housing, a first electrode terminal, a first current collecting member, and a plurality of electrode assemblies. The housing has a wall portion. The first electrode terminal is attached to the wall portion. The plurality of electrode assemblies are accommodated in the shell, the plurality of electrode assemblies are stacked along a first direction, each electrode assembly comprises a main body part and a first tab, the first tab is arranged at one end of the main body part along a second direction, the first tabs of the plurality of electrode assemblies are positioned at the same end of the main body part, and the second direction intersects with the first direction. The first current collecting member electrically connects the first electrode terminal and each of the first tabs. Therefore, a plurality of first current collecting components do not need to be arranged in the shell to be connected with the first tabs of the plurality of electrode assemblies, and the thickness or the volume of the single electrode assembly does not need to be increased, so that the manufacturing difficulty of the electrode assemblies can be effectively reduced, and the manufacturing difficulty of the large-capacity battery monomer is reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Batteries, as core components of new energy vehicles, have high requirements in terms of performance. Among them, the battery cell of the battery usually includes a shell and an electrode assembly contained in the shell. In order to increase the capacity of the battery cell, it is usually necessary to increase the volume of the electrode assembly to achieve a large-capacity battery cell. However, the existing large-capacity battery cells are difficult to manufacture, which is not conducive to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery, an electrical device and an energy storage cabinet, which can effectively reduce the difficulty of manufacturing the battery cell.

[0004] In the 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 has a wall portion; the first electrode terminal is mounted on the wall portion; a plurality of the electrode assemblies are accommodated in the shell, and the plurality of the electrode assemblies are stacked along a first direction, the electrode assembly comprises a main body and a first pole ear, along a second direction, the first pole ear is arranged at one end of the main body, the first pole ears of the plurality of the electrode assemblies are located at the same end of the main body, and the second direction intersects with the first direction; the first current collecting member electrically connects the first electrode terminal and each of the first pole ears.

[0005] In the above technical scheme, a plurality of electrode assemblies stacked along a first direction are arranged in the outer shell of the battery cell, the first pole ears of the plurality of electrode assemblies are all located at the same end of the main body in the second direction, and the first pole ears of the plurality of electrode assemblies are all electrically connected to the first electrode terminal through the first current collecting member to realize the input or output of electric energy of the battery cell, and the plurality of electrode assemblies are stacked in the outer shell to increase the number of electrode assemblies accommodated in the outer shell of the battery cell, which is beneficial to improve the electric capacity of the battery cell. A battery cell adopting such a structure only needs to stack a plurality of electrode assemblies in the outer shell and connect the first pole ears of the plurality of electrode assemblies through a first current collecting member to realize the input or output of electric energy of a large-capacity battery cell, and there is no need to set a plurality of first current collecting members in the outer shell to connect the first pole ears of the plurality of electrode assemblies, and there is no need to increase the thickness or volume of a single electrode assembly, thereby effectively reducing the manufacturing difficulty of the electrode assembly, so as to reduce the manufacturing difficulty of a large-capacity battery cell, which is beneficial to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0006] In some embodiments, along the second direction, at least a portion of the first current collecting member is located on a side of the main body where the first electrode tab is disposed, and a portion of the first electrode tab is located on a side of the first current collecting member away from the main body and connected to the first current collecting member.

[0007] In the above technical solution, by setting at least a part of the first current collecting component to be located on the side of the main body where the first pole ear is provided, so as to facilitate the connection between the first current collecting component and the first pole ear, it is helpful to reduce the difficulty of assembling the first current collecting component and the first pole ear, wherein, by setting a part of the first pole ear to be located on the side of the first current collecting component away from the main body in the second direction, and the part is connected to the first current collecting component, so that the first pole ear is a structure that bypasses the first current collecting component and is connected to the side of the first current collecting component away from the main body. On the one hand, it can reduce the difficulty of connecting the first pole ear to the first current collecting component, and on the other hand, it can reduce the phenomenon that the first current collecting component presses the first pole ear downward toward the side close to the main body, so as to reduce the risk of short circuit caused by the first pole ear being inserted upside down into the main body.

[0008] In some embodiments, a first avoidance area is provided on the first current collecting member, the first avoidance area penetrates the first current collecting member along the second direction, and the first electrode tab passes through the first avoidance area and is connected to a side of the first current collecting member away from the main body.

[0009] In the above technical solution, by setting a first avoidance area on the first current collecting member, and the first avoidance area runs through both sides of the first current collecting member along the second direction, the first pole ear can be connected to the side of the first current collecting member away from the main body after passing through the first avoidance area. The battery cell adopting this structure is convenient for arranging the first pole ear to be connected to the side of the first current collecting member away from the main body, which can reduce the difficulty of the first pole ear bypassing the first current collecting member and optimize the length of the first pole ear bypassing the first current collecting member, thereby alleviating the redundancy of the first pole ear and reducing the manufacturing cost of the battery cell.

[0010] In some embodiments, the first avoidance area is a through hole provided on the first current collecting component; or, the first avoidance area is a notch provided on the edge of the first current collecting component.

[0011] In the above technical solution, the first avoidance area can be a through hole arranged on the first current collecting component or a notch arranged at the edge of the first current collecting component, so that the first electrode ear can be connected to the side of the first current collecting component away from the main body after passing through the first avoidance area. The structure is simple and easy to manufacture.

[0012] In some embodiments, the first current collecting component is disposed in the shell; or, along the second direction, a first channel for each first pole ear to extend out is provided on one side of the shell close to the first pole ear, and each first pole ear can extend out of the shell through the corresponding first channel, and the first current collecting component is disposed outside the shell, and the first current collecting component is electrically connected to the extended first pole ear.

[0013] In the above technical solution, by arranging the first current collecting member inside the shell, it is helpful to reduce the assembly difficulty of the first pole ear being electrically connected to the first electrode terminal through the first current collecting member, so as to improve the production efficiency of the battery cell, and the shell can play a certain protective role on the first current collecting member, so as to reduce the phenomenon of wear or damage of the first current collecting member during use. By arranging the first current collecting member outside the shell, and providing the first hole for the first pole ear to pass through on the shell, the first pole ear can be electrically connected to the first electrode terminal through the first current collecting member after passing through the shell. The battery cell adopting this structure is convenient for the later inspection of the first current collecting member, and is convenient for the maintenance and replacement of the first current collecting member, which is conducive to reducing the maintenance cost of the battery cell.

[0014] In some embodiments, the electrode assembly further includes a second pole lug, which is disposed at one end of the main body along the second direction, and the second pole lugs of a plurality of the electrode assemblies are located at the same end of the main body, and the polarity of the second pole lug is opposite to that of the first pole lug; wherein the battery cell further includes a second electrode terminal and a second current collecting member, the second electrode terminal being mounted on the wall portion, and the second current collecting member electrically connecting the second electrode terminal and each of the second pole lugs.

[0015] In the above technical solution, the electrode assembly is also provided with a second electrode ear with a polarity opposite to that of the first electrode ear, and the second electrode ears of the plurality of electrode assemblies are all located at the same end of the main body in the second direction, and the second electrode ears of the plurality of electrode assemblies are all electrically connected to the second electrode terminal through the second current collecting member to realize the input or output of electric energy of the battery cell. The battery cell adopting this structure only needs to stack multiple electrode assemblies in the outer shell and connect the second electrode ears of the plurality of electrode assemblies through a second current collecting member to realize the input or output of electric energy of a large-capacity battery cell. There is no need to set multiple second current collecting members in the outer shell to connect the second electrode ears of the plurality of electrode assemblies, and there is no need to increase the thickness or volume of a single electrode assembly, thereby effectively reducing the manufacturing difficulty of the electrode assembly, thereby reducing the manufacturing difficulty of large-capacity battery cells, which is beneficial to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0016] In some embodiments, along the second direction, at least a portion of the second current collecting member is located on a side of the body portion where the second electrode tab is disposed, and a portion of the second electrode tab is located on a side of the second current collecting member away from the body portion and connected to the second current collecting member.

[0017] In the above technical solution, by setting at least a part of the second current collecting member to be located on the side of the main body where the second pole ear is provided, so as to facilitate the connection between the second current collecting member and the second pole ear, it is helpful to reduce the difficulty of assembling the second current collecting member and the second pole ear, wherein, by setting a part of the second pole ear to be located on the side of the second current collecting member away from the main body in the second direction, and the part is connected to the second current collecting member, so that the second pole ear is a structure that bypasses the second current collecting member and is connected to the side of the second current collecting member away from the main body. On the one hand, it can reduce the difficulty of connecting the second pole ear with the second current collecting member, and on the other hand, it can reduce the phenomenon that the second current collecting member presses the second pole ear in the direction close to the main body, so as to reduce the risk of short circuit caused by the second pole ear being inserted upside down into the main body.

[0018] In some embodiments, a second avoidance area is provided on the second current collecting member, the second avoidance area penetrates the second current collecting member along the second direction, and the second electrode tab passes through the second avoidance area and is connected to a side of the second current collecting member away from the main body.

[0019] In the above technical solution, by setting a second avoidance area on the second current collecting member, and the second avoidance area runs through both sides of the second current collecting member along the second direction, the second pole ear can be connected to the side of the second current collecting member away from the main body after passing through the second avoidance area. The battery cell adopting this structure is convenient for arranging the second pole ear to be connected to the side of the second current collecting member away from the main body, which can reduce the difficulty of the second pole ear bypassing the second current collecting member and optimize the length of the second pole ear bypassing the second current collecting member, thereby alleviating the phenomenon of redundancy of the second pole ear and reducing the manufacturing cost of the battery cell.

[0020] In some embodiments, the second avoidance area is a through hole provided on the second current collecting member; or, the second avoidance area is a notch provided on the edge of the second current collecting member.

[0021] In the above technical solution, the second avoidance area can be a through hole arranged on the second current collecting component or a notch arranged at the edge of the second current collecting component, so that the second electrode ear can be connected to the side of the second current collecting component away from the main body after passing through the second avoidance area. The structure is simple and easy to manufacture.

[0022] In some embodiments, the second current collecting component is disposed in the shell; or, along the second direction, a second channel for each second pole ear to extend out is provided on one side of the shell close to the second pole ear, and each second pole ear can extend out of the shell through the corresponding second channel, and the second current collecting component is disposed outside the shell, and the second current collecting component is electrically connected to the extended second pole ear.

[0023] In the above technical solution, by arranging the second current collecting member inside the shell, it is helpful to reduce the assembly difficulty of the second pole ear being electrically connected to the second electrode terminal through the second current collecting member, so as to improve the production efficiency of the battery cell, and the shell can play a certain protective role on the second current collecting member, so as to reduce the phenomenon of wear or damage of the second current collecting member during use. By arranging the second current collecting member outside the shell, and providing the shell with a second hole for the second pole ear to pass through, the second pole ear can be electrically connected to the second electrode terminal through the second current collecting member after passing through the shell. The battery cell adopting this structure is convenient for the later inspection of the second current collecting member, and is convenient for the maintenance and replacement of the second current collecting member, which is conducive to reducing the maintenance cost of the battery cell.

[0024] In some embodiments, along the second direction, the first pole lug and the second pole lug are both arranged at the same end of the main body, and the first pole lug and the second pole lug are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are not coplanar and intersect each other; wherein, the first current collecting component includes a first connecting portion electrically connecting each of the first pole lugs, and the second current collecting component includes a second connecting portion electrically connecting each of the second pole lugs, the first connecting portion and the second connecting portion are both located on the side of the main body on which the first pole lug and the second pole lug are arranged in the second direction, and the first connecting portion and the second connecting portion are arranged at intervals along the third direction.

[0025] In the above technical solution, by arranging the first pole lug and the second pole lug at the same end of the main body in the second direction, and the first connecting portion of the first current collecting member and the second connecting portion of the second current collecting member are both located on the side of the main body where the first pole lug and the second pole lug are arranged, on the one hand, it is convenient to connect the first current collecting member with the first pole lug, and to connect the second current collecting member with the second pole lug, which is conducive to reducing the difficulty of assembling the first current collecting member and the second current collecting member, and on the other hand, the first current collecting member and the second current collecting member can share space in the second direction, which is conducive to saving the space occupied by the first current collecting member and the second current collecting member in the second direction, thereby improving the space utilization of the battery cell to improve the energy density of the battery cell.

[0026] In some embodiments, the battery cell further includes a first insulating member; the first insulating member is disposed along the second direction on a side of the first connection portion and the second connection portion away from the main body portion to insulate and isolate the first connection portion and the shell and the second connection portion and the shell.

[0027] In the above technical solution, the battery cell is also provided with a first insulating member, and the first insulating member is arranged on the side of the first connecting portion and the second connecting portion away from the main body, so that the first insulating member is located between the first connecting portion and the second connecting portion and the outer shell in the second direction. The battery cell adopting this structure can, on the one hand, realize insulation isolation between the first connecting portion and the outer shell and between the second connecting portion and the outer shell, which is beneficial to reduce the risk of short circuit between the first current collecting member and the second current collecting member and the outer shell; on the other hand, it can realize that the first connecting portion of the first current collecting member and the second connecting portion of the second current collecting member share a first insulating member, which is beneficial to optimize the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0028] In some embodiments, the battery cell further includes a second insulating member disposed between the first connection portion and the second connection portion and the main body along the second direction to insulate and isolate the first connection portion and the main body and the second connection portion and the main body.

[0029] In the above technical solution, the battery cell is also provided with a second insulating member, and the second insulating member is arranged on the side of the first connecting part and the second connecting part facing the main body, so that the second insulating member is located between the first connecting part and the second connecting part and the main body in the second direction. The battery cell adopting this structure can, on the one hand, realize insulation isolation between the first connecting part and the main body and between the second connecting part and the main body, which is beneficial to reduce the risk of short circuit between the first current collecting member and the second current collecting member and the main body. On the other hand, it can realize that the first connecting part of the first current collecting member and the second connecting part of the second current collecting member share a second insulating member, which is beneficial to optimize the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0030] In some embodiments, along the second direction, the wall portion is located on one side of the plurality of electrode assemblies, the first electrode tab and the second electrode tab are both arranged at one end of the main body portion facing the wall portion, and the first current collecting member and the second current collecting member are both arranged at one side of the main body portion facing the wall portion.

[0031] In the above technical solution, the wall portion is located on the side where the first and second pole ears are provided on the second direction of the plurality of electrode assemblies, and the first current collecting member and the second current collecting member are both provided on the side of the main body facing the wall portion. On the one hand, it is convenient for the first current collecting member to connect the first pole ear and the first electrode terminal provided on the wall portion, and it is convenient for the second current collecting member to connect the second pole ear and the second electrode terminal provided on the wall portion, which is beneficial to reducing the difficulty of assembling the battery cell. On the other hand, it is possible to realize that the first and second current collecting members are integrally provided on the side of the main body facing the wall portion, which is beneficial to saving the space occupied by the first and second current collecting members, so as to improve the energy density of the battery cell.

[0032] In some embodiments, along the second direction, a first protrusion is protruding from a side of the first current collecting member facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or, along the second direction, a second protrusion is protruding from a side of the second current collecting member facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0033] In the above technical solution, the first current collecting member is provided with a first protrusion on one side facing the wall in the second direction, and the first protrusion is connected to the first electrode terminal to realize the electrical connection between the first current collecting member and the first electrode terminal. The first current collecting member adopting such a structure can reduce the difficulty of assembling the first current collecting member and the first electrode terminal, and the structure in which the first protrusion is connected to the first electrode terminal can improve the connection reliability between the first current collecting member and the first electrode terminal. Similarly, the second current collecting member is provided with a second protrusion on one side facing the wall in the second direction, and the second protrusion is connected to the second electrode terminal to realize the electrical connection between the second current collecting member and the second electrode terminal. The second current collecting member adopting such a structure can reduce the difficulty of assembling the second current collecting member and the second electrode terminal, and the structure in which the second protrusion is connected to the second electrode terminal can improve the connection reliability between the second current collecting member and the second electrode terminal.

[0034] In some embodiments, along the first direction, the wall portion is located on at least one side of the plurality of electrode assemblies; wherein the first current collecting member further includes a third connection portion connected to the first connection portion, the third connection portion is located in the first direction on the side of the plurality of electrode assemblies facing the wall portion, and the third connection portion is connected to the first electrode terminal; the second current collecting member further includes a fourth connection portion connected to the second connection portion, the fourth connection portion is located in the first direction on the side of the plurality of electrode assemblies facing the wall portion, and the fourth connection portion is connected to the second electrode terminal.

[0035] In the above technical solution, the wall portion of the shell is located on at least one side of the plurality of electrode assemblies in the first direction, so that the wall portion is arranged in the same direction as the plurality of electrode assemblies, and the first current collecting member has a third connecting portion located on the side of the plurality of electrode assemblies facing the wall portion in the first direction, the third connecting portion and the first connecting portion are connected to each other, and the third connecting portion is connected to the first electrode terminal provided on the wall portion, and the first connecting portion is connected to the first pole ear of the plurality of electrode assemblies, so that the first pole ear is electrically connected to the first electrode terminal through the first current collecting member. The battery cell adopting this structure can, on the one hand, separate the area of ​​the shell where the first electrode terminal is provided and the area of ​​the main body where the first pole ear is provided, so that the area of ​​the shell facing the side of the main body where the first pole ear is provided No first electrode terminal is provided, so that a plurality of battery cells can be stacked and placed along the second direction. 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 lug can be separated 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, and can reduce the interference between the first electrode terminal and the first pole lug, especially when the first electrode terminal and the first pole lug are welded to the first 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 pole lug and the first current collecting member can be effectively reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first pole lug connected to the first current collecting member. Similarly, the second current collecting member has a fourth connecting portion located on the side of the plurality of electrode assemblies facing the wall in the first direction, and the fourth connecting portion is connected to the second electrode terminal provided on the wall, and the second connecting portion is connected to the second pole ears of the plurality of electrode assemblies, so that the second pole ears are electrically connected to the second electrode terminals through the second current collecting member. The battery cell adopting this structure can, on the one hand, separate the area of ​​the outer shell where the second electrode terminal is provided and the area of ​​the main body where the second pole ear is provided, so that the area of ​​the outer shell facing the side of the main body where the second pole ear is provided is not provided with the second electrode terminal, thereby facilitating the stacking and placement of the plurality of battery cells along the second direction. On the other hand, 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 electrode tab can be separated from each other, which is beneficial to reducing the difficulty of assembling the second current collecting member, the second electrode terminal and the second tab, and can reduce the interference between the second electrode terminal and the second tab, especially when the second electrode terminal and the second 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 tab and the second current collecting member can be effectively reduced, which is beneficial to improving the assembly quality and stability of the second electrode terminal and the second tab connected to the second current collecting member.

[0036] In some embodiments, along the first direction, a first protrusion is protruding from the side of the third connecting portion facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or, along the first direction, a second protrusion is protruding from the side of the fourth connecting portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0037] In the above technical solution, the third connection part of the first current collecting member is provided with a first protrusion on one side facing the wall in the first direction, and the first protrusion is connected to the first electrode terminal to realize the electrical connection between the first current collecting member and the first electrode terminal. The first current collecting member adopting such a structure can reduce the difficulty of assembling the third connection part of the first current collecting member and the first electrode terminal, and the structure of the first protrusion and the first electrode terminal being connected to each other can improve the connection reliability between the third connection part of the first current collecting member and the first electrode terminal. Similarly, the fourth connection part of the second current collecting member is provided with a second protrusion on one side facing the wall in the first direction, and the second protrusion is connected to the second electrode terminal to realize the electrical connection between the second current collecting member and the second electrode terminal. The second current collecting member adopting such a structure can reduce the difficulty of assembling the fourth connection part of the second current collecting member and the second electrode terminal, and the structure of the second protrusion and the second electrode terminal being connected to each other can improve the connection reliability between the fourth connection part of the second current collecting member and the second electrode terminal.

[0038] In some embodiments, along the first direction, the first electrode terminal and the second electrode terminal are both arranged on the same side of the plurality of electrode assemblies, and the third connection portion and the fourth connection portion are both located on the side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal.

[0039] In the above technical solution, by arranging the first electrode terminal and the second electrode terminal on the same side of the plurality of electrode assemblies in the first direction, the first electrode terminal and the second electrode terminal are both installed on a wall portion, and the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are both located on the side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal. On the one hand, it is convenient to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal. On the other hand, the battery cell is structured such that the first electrode terminal and the second electrode terminal are provided at the same end in the first direction, and the third connection portion and the fourth connection portion can share space in the first direction, thereby improving the space utilization of the battery cell and enhancing the energy density of the battery cell.

[0040] In some embodiments, the battery cell further includes a third insulating member; the third insulating member is disposed along the first direction between the third connection portion and the fourth connection portion and the plurality of electrode assemblies to insulate and isolate the third connection portion and the electrode assembly and the fourth connection portion and the electrode assembly.

[0041] In the above technical solution, the battery cell is also provided with a third insulating member, and the third insulating member is arranged on the side of the third connecting part and the fourth connecting part facing the multiple electrode assemblies, so that the third insulating member is located between the third connecting part and the fourth connecting part and the multiple electrode assemblies. The battery cell adopting this structure can, on the one hand, realize the insulation isolation between the third connecting part and the electrode assembly and between the fourth connecting part and the electrode assembly, which is beneficial to reduce the risk of short circuit. On the other hand, it can realize that the third connecting part of the first current collecting component and the fourth connecting part of the second current collecting component share a third insulating member, which is beneficial to optimize the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0042] In some embodiments, along the first direction, a first card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the third connecting portion is accommodated in the first card slot; and / or, along the first direction, a second card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second card slot.

[0043] In the above technical solution, by providing a first card slot on the side of the third insulating member away from the electrode assembly along the first direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and multiple electrode assemblies, and the third insulating member and the third connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing a second card slot on the side of the third insulating member away from the electrode assembly along the first direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the third insulating assembly between the fourth connection portion and multiple electrode assemblies, and the third insulating member and the fourth connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0044] In some embodiments, along the first direction, the outer shell has two wall portions arranged opposite to each other, the two wall portions are respectively located on both sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively arranged on the two wall portions; wherein the third connecting portion is located on the side of the plurality of electrode assemblies facing the first electrode terminal, and the fourth connecting portion is located on the side of the plurality of electrode assemblies facing the second electrode terminal.

[0045] In the above technical solution, by respectively arranging the first electrode terminal and the second electrode terminal on two wall portions located on both sides of the plurality of electrode assemblies in the first direction, and the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are respectively located on both sides of the plurality of electrode assemblies, on the one hand, it is convenient to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal, and on the other hand, it is possible to realize that the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are away from each other, which is conducive to alleviating the interference phenomenon between the third connection portion and the fourth connection portion, and can reduce the risk of short circuit between the third connection portion and the fourth connection portion, so as to improve the reliability of the battery cell.

[0046] In some embodiments, the battery cell also includes a third insulating member and a fourth insulating member; the third insulating member and the fourth insulating member are respectively arranged on both sides of the plurality of electrode assemblies along the first direction, the third insulating member is located between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly, and the fourth insulating member is located between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion and the electrode assembly.

[0047] In the above technical solution, the battery cell is also provided with a third insulating member and a fourth insulating member, and the third insulating member and the fourth insulating member are respectively arranged on both sides of the multiple electrode assemblies in the first direction, so that the third insulating member is located between the third connecting part and the multiple electrode assemblies, and the fourth insulating member is located between the fourth connecting part and the multiple electrode assemblies, thereby achieving insulation isolation between the third connecting part and the electrode assembly and between the fourth connecting part and the electrode assembly, which is beneficial to reduce the short-circuit risk of the battery cell and improve the reliability of the battery cell.

[0048] In some embodiments, along the first direction, a first card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the third connecting portion is accommodated in the first card slot; and / or, along the first direction, a second card slot is provided on the side of the fourth insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second card slot.

[0049] In the above technical solution, by providing a first card slot on the side of the third insulating member away from the electrode assembly along the first direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing a second card slot on the side of the fourth insulating member away from the electrode assembly along the first direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connection portion and the plurality of electrode assemblies, and the fourth insulating member and the fourth connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0050] In some embodiments, along the second direction, the first pole lug and the second pole lug are respectively arranged at both ends of the main body; wherein the first current collecting component includes a first connecting portion electrically connecting each of the first pole lugs, and the first connecting portion is located on the side of the main body where the first pole lug is arranged in the second direction, and the second current collecting component includes a second connecting portion electrically connecting each of the second pole lugs, and the second connecting portion is located on the side of the main body where the second pole lug is arranged in the second direction.

[0051] In the above technical solution, by respectively arranging the first pole lug and the second pole lug at the two ends of the main body in the second direction, and respectively arranging the first connecting portion of the first current collecting member and the second connecting portion of the second current collecting member at both sides of the plurality of electrode assemblies in the second direction, 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 second 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.

[0052] In some embodiments, the battery cell also includes two first insulating members; the two first insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the second direction, one first insulating member is located on the side of the first connecting part away from the main body to insulate and isolate the first connecting part and the outer shell, and the other first insulating member is located on the side of the second connecting part away from the main body to insulate and isolate the second connecting part and the outer shell.

[0053] In the above technical solution, the battery cell is also provided with two first insulating members, and the two first insulating members are respectively arranged on the side of the first connecting portion of the first current collecting member away from the electrode assembly and the side of the second connecting portion of the second current collecting member away from the electrode assembly, so that the first insulating member is arranged between the first connecting portion and the outer shell and between the second connecting portion and the outer shell, so that the two first insulating members can respectively achieve insulation isolation between the first connecting portion and the outer shell and between the second connecting portion and the outer shell, which is beneficial to reduce the risk of short circuit between the first current collecting member, the second current collecting member and the outer shell, so as to improve the reliability of the battery cell.

[0054] In some embodiments, the battery cell also includes two second insulating members; the two second insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the second direction, one second insulating member is located between the first connecting part and the main body to insulate and isolate the first connecting part and the main body, and the other second insulating member is located between the second connecting part and the main body to insulate and isolate the second connecting part and the main body.

[0055] In the above technical solution, the battery cell is also provided with two second insulating members, and the two second insulating members are respectively arranged on the side of the first connecting part facing the main body and the side of the second connecting part facing the main body, so that the second insulating members are arranged between the first connecting part and the main body and between the second connecting part and the main body, so that the insulation isolation between the first connecting part and the main body and between the second connecting part and the main body can be achieved respectively through the two first insulating members, which is beneficial to reduce the risk of short circuit between the first current collecting component, the second current collecting component and the main body, so as to improve the reliability of the battery cell.

[0056] In some embodiments, along the first direction, the wall portion is located on at least one side of the plurality of electrode assemblies; wherein the first current collecting member further includes a third connection portion connected to the first connection portion, the third connection portion is located in the first direction on the side of the plurality of electrode assemblies facing the wall portion, and the third connection portion is connected to the first electrode terminal; the second current collecting member further includes a fourth connection portion connected to the second connection portion, the fourth connection portion is located in the first direction on the side of the plurality of electrode assemblies facing the wall portion, and the fourth connection portion is connected to the second electrode terminal.

[0057] In the above technical solution, the wall portion of the shell is located on at least one side of the plurality of electrode assemblies in the first direction, so that the wall portion is arranged in the same direction as the plurality of electrode assemblies, and the first current collecting member has a third connecting portion located on the side of the plurality of electrode assemblies facing the wall portion in the first direction, the third connecting portion and the first connecting portion are connected to each other, and the third connecting portion is connected to the first electrode terminal provided on the wall portion, and the first connecting portion is connected to the first pole ear of the plurality of electrode assemblies, so that the first pole ear is electrically connected to the first electrode terminal through the first current collecting member. The battery cell adopting this structure can, on the one hand, separate the area of ​​the shell where the first electrode terminal is provided and the area of ​​the main body where the first pole ear is provided, so that the area of ​​the shell facing the side of the main body where the first pole ear is provided No first electrode terminal is provided, so that a plurality of battery cells can be stacked and placed along the second direction. 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 lug can be separated 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, and can reduce the interference between the first electrode terminal and the first pole lug, especially when the first electrode terminal and the first pole lug are welded to the first 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 pole lug and the first current collecting member can be effectively reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first pole lug connected to the first current collecting member. Similarly, the second current collecting member has a fourth connecting portion located on the side of the plurality of electrode assemblies facing the wall in the first direction, and the fourth connecting portion is connected to the second electrode terminal provided on the wall, and the second connecting portion is connected to the second pole ears of the plurality of electrode assemblies, so that the second pole ears are electrically connected to the second electrode terminals through the second current collecting member. The battery cell adopting this structure can, on the one hand, separate the area of ​​the outer shell where the second electrode terminal is provided and the area of ​​the main body where the second pole ear is provided, so that the area of ​​the outer shell facing the side of the main body where the second pole ear is provided is not provided with the second electrode terminal, thereby facilitating the stacking and placement of the plurality of battery cells along the second direction. On the other hand, 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 electrode tab can be separated from each other, which is beneficial to reducing the difficulty of assembling the second current collecting member, the second electrode terminal and the second tab, and can reduce the interference between the second electrode terminal and the second tab, especially when the second electrode terminal and the second 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 tab and the second current collecting member can be effectively reduced, which is beneficial to improving the assembly quality and stability of the second electrode terminal and the second tab connected to the second current collecting member.

[0058] In some embodiments, along the first direction, a first protrusion is protruding from the side of the third connecting portion facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or, along the first direction, a second protrusion is protruding from the side of the fourth connecting portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0059] In the above technical solution, the third connection part of the first current collecting member is provided with a first protrusion on one side facing the wall in the first direction, and the first protrusion is connected to the first electrode terminal to realize the electrical connection between the first current collecting member and the first electrode terminal. The first current collecting member adopting such a structure can reduce the difficulty of assembling the third connection part of the first current collecting member and the first electrode terminal, and the structure of the first protrusion and the first electrode terminal being connected to each other can improve the connection reliability between the third connection part of the first current collecting member and the first electrode terminal. Similarly, the fourth connection part of the second current collecting member is provided with a second protrusion on one side facing the wall in the first direction, and the second protrusion is connected to the second electrode terminal to realize the electrical connection between the second current collecting member and the second electrode terminal. The second current collecting member adopting such a structure can reduce the difficulty of assembling the fourth connection part of the second current collecting member and the second electrode terminal, and the structure of the second protrusion and the second electrode terminal being connected to each other can improve the connection reliability between the fourth connection part of the second current collecting member and the second electrode terminal.

[0060] In some embodiments, along the first direction, the first electrode terminal and the second electrode terminal are both arranged on the same side of the plurality of electrode assemblies, and the third connection portion and the fourth connection portion are both located on the side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal.

[0061] In the above technical solution, by arranging the first electrode terminal and the second electrode terminal on the same side of the plurality of electrode assemblies in the first direction, the first electrode terminal and the second electrode terminal are both installed on a wall portion, and the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are both arranged on the side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal. On the one hand, it is convenient to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal. On the other hand, the battery cell is structured such that the first electrode terminal and the second electrode terminal are provided at the same end in the first direction, and the third connection portion and the fourth connection portion can share space in the first direction, thereby improving the space utilization of the battery cell and enhancing the energy density of the battery cell.

[0062] In some embodiments, the battery cell further includes a third insulating member; the third insulating member is disposed along the first direction between the third connection portion and the fourth connection portion and the plurality of electrode assemblies to insulate and isolate the third connection portion and the electrode assembly and the fourth connection portion and the electrode assembly.

[0063] In the above technical solution, the battery cell is also provided with a third insulating member, and the third insulating member is arranged on the side of the third connecting part and the fourth connecting part facing the multiple electrode assemblies, so that the third insulating member is located between the third connecting part and the fourth connecting part and the multiple electrode assemblies. The battery cell adopting this structure can, on the one hand, realize the insulation isolation between the third connecting part and the electrode assembly and between the fourth connecting part and the electrode assembly, which is beneficial to reduce the risk of short circuit. On the other hand, it can realize that the third connecting part of the first current collecting component and the fourth connecting part of the second current collecting component share a third insulating member, which is beneficial to optimize the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0064] In some embodiments, along the first direction, a first card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the third connecting portion is accommodated in the first card slot; and / or, along the first direction, a second card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second card slot.

[0065] In the above technical solution, by providing a first card slot on the side of the third insulating member away from the electrode assembly along the first direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and multiple electrode assemblies, and the third insulating member and the third connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing a second card slot on the side of the third insulating member away from the electrode assembly along the first direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the third insulating assembly between the fourth connection portion and multiple electrode assemblies, and the third insulating member and the fourth connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0066] In some embodiments, along the first direction, the outer shell has two wall portions arranged opposite to each other, the two wall portions are respectively located on both sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively arranged on the two wall portions; wherein the third connecting portion is located on the side of the plurality of electrode assemblies facing the first electrode terminal, and the fourth connecting portion is located on the side of the plurality of electrode assemblies facing the second electrode terminal.

[0067] In the above technical solution, by respectively arranging the first electrode terminal and the second electrode terminal on two wall portions located on both sides of the plurality of electrode assemblies in the first direction, and the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are located on both sides of the plurality of electrode assemblies, on the one hand, it is convenient to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal, and on the other hand, it is possible to keep the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member away from each other, which is beneficial to reducing the risk of short circuit between the third connection portion and the fourth connection portion, so as to improve the reliability of the battery cell.

[0068] In some embodiments, the battery cell also includes a third insulating member and a fourth insulating member; the third insulating member and the fourth insulating member are respectively arranged on both sides of the plurality of electrode assemblies along the first direction, the third insulating member is located between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly, and the fourth insulating member is located between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion and the electrode assembly.

[0069] In the above technical solution, the battery cell is also provided with a third insulating member and a fourth insulating member, and the third insulating member and the fourth insulating member are respectively arranged on both sides of the multiple electrode assemblies in the first direction, so that the third insulating member is located between the third connecting part and the multiple electrode assemblies, and the fourth insulating member is located between the fourth connecting part and the multiple electrode assemblies, thereby achieving insulation isolation between the third connecting part and the electrode assembly and between the fourth connecting part and the electrode assembly, which is beneficial to reduce the short-circuit risk of the battery cell and improve the reliability of the battery cell.

[0070] In some embodiments, along the first direction, a first card slot is provided on the side of the third insulating member facing away from the electrode assembly, and the third connecting portion is accommodated in the first card slot; and / or, along the first direction, a second card slot is provided on the side of the fourth insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second card slot.

[0071] In the above technical solution, by providing a first card slot on the side of the third insulating member away from the electrode assembly along the first direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing a second card slot on the side of the fourth insulating member away from the electrode assembly along the first direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connection portion and the plurality of electrode assemblies, and the fourth insulating member and the fourth connection portion can share a space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0072] In some embodiments, a buffer is disposed between two adjacent electrode assemblies along the first direction.

[0073] In the above technical solution, a buffer member is arranged between two adjacent electrode assemblies in the first direction, so that the buffer member can play a buffering role between the two adjacent electrode assemblies, so that the buffer member can absorb the expansion force and collision force between multiple electrode assemblies, thereby effectively alleviating the collision phenomenon between the two adjacent electrode assemblies, and effectively alleviating the extrusion phenomenon of the mutual expansion of the two adjacent electrode assemblies, thereby effectively improving the reliability and service life of the battery cell.

[0074] In some embodiments, the battery cell includes N electrode assemblies stacked along the first direction, and N≥5.

[0075] In the above technical solution, by setting the number of electrode assemblies stacked along the first direction of the battery cells to be greater than or equal to 5, a large-capacity battery cell can be achieved. A large-capacity battery cell can be achieved without increasing the winding size or stacking size of a single electrode assembly, which is beneficial to reducing the manufacturing difficulty and manufacturing cost of a single electrode assembly.

[0076] In some embodiments, the outer shell includes a shell and an end cover; the interior of the shell forms a accommodating cavity with an opening, and the accommodating cavity is used to accommodate the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion; or, the shell includes the wall portion.

[0077] In the above technical solution, by setting the wall of the shell as an end cap for closing the opening of the shell, the battery cell with such a structure is convenient for assembling the first electrode terminal and other components on the end cap, and is convenient for connecting the first current collecting member and the first electrode terminal, which is conducive to reducing the difficulty of assembling the battery cell, so as to improve the production efficiency of the battery cell. Similarly, by setting the wall of the shell as a wall of the shell, the battery cell with such a structure can make the area of ​​the shell where the first electrode terminal and other components are installed away from the end cap, so as to alleviate the phenomenon that the force generated by the first electrode terminal and other components pulling or twisting the wall directly acts on the end cap, which is conducive to reducing the risk of connection failure between the end cap and the shell, and further can effectively reduce the risk of leakage of the battery cell during use.

[0078] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0079] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy.

[0080] In a fourth aspect, an embodiment of the present application further provides an energy storage cabinet comprising a plurality of the above-mentioned battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] 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.

[0082] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0083] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0084] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0085] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0086] Figure 5 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0087] Figure 6 A schematic diagram of assembling a first current collecting member and an electrode assembly of a battery cell provided in some embodiments of the present application;

[0088] Figure 7 A schematic structural diagram of a first current collecting member of a battery cell provided in some embodiments of the present application;

[0089] Figure 8 A schematic diagram of the structure of the first current collecting member of the battery cell provided in some embodiments of the present application in other embodiments;

[0090] Fig. 9 A schematic structural diagram of a second current collecting member of a battery cell provided in some embodiments of the present application;

[0091] Fig.10 A schematic diagram of the structure of a battery cell provided in some other embodiments of the present application;

[0092] Fig.11 An exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0093] Fig.12 A schematic diagram of assembling a first current collecting member and an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0094] Fig.13 A schematic structural diagram of a first current collecting member of a battery cell provided in some other embodiments of the present application;

[0095] Fig.14 A schematic structural diagram of a second current collecting member of a battery cell provided in some other embodiments of the present application;

[0096] Fig.15 A schematic diagram of the structure of a battery cell in other embodiments provided by some other embodiments of the present application;

[0097] Fig.16 A structural explosion diagram of a battery cell in other embodiments provided by yet other embodiments of the present application;

[0098] Fig.17 A schematic diagram of the structure of a battery cell provided in some other embodiments of the present application;

[0099] Fig.18 An exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0100] Fig.19 A schematic diagram of assembling a first current collecting member and an electrode assembly of a battery cell provided in some further embodiments of the present application;

[0101] Fig. 20 A schematic structural diagram of a first current collecting member of a battery cell provided in some further embodiments of the present application;

[0102] Fig.21A schematic structural diagram of a second current collecting member of a battery cell provided in some further embodiments of the present application;

[0103] Fig. 22 An exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0104] Fig.23 A schematic diagram of assembling a first current collecting member and an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0105] Fig.24 A schematic diagram of assembling a first current collecting member and an electrode assembly of a battery cell provided in some further embodiments of the present application.

[0106] Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-wall; 212-housing; 2121-opening; 213-end cover; 22-first electrode terminal; 23-first current collecting member; 231-first avoidance area; 232-first connecting portion; 233-third connecting portion; 234-first protrusion; 24-electrode assembly; 241-main body; 24 2-first pole ear; 243-second pole ear; 25-second electrode terminal; 26-second current collecting member; 261-second avoidance area; 262-second connecting portion; 263-fourth connecting portion; 264-second protrusion; 27-first insulating member; 28-second insulating member; 29-third insulating member; 30-fourth insulating member; 31-first card slot; 32-second card slot; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0107] 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.

[0108] 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.

[0109] 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.

[0110] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0111] 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.

[0112] 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.

[0113] The term "plurality" used in the present application refers to two or more (including two).

[0114] 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.

[0115] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0116] 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 prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0117] 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.

[0118] 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.

[0119] 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 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.).

[0120] 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 batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), 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 LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0121] 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.

[0122] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0123] 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 or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base 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.).

[0124] 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.

[0125] 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.

[0126] 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 batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0127] 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.

[0128] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0129] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0136] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0137] 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.

[0138] 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.

[0139] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0140] 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.

[0141] In some embodiments, the electrode assembly is a laminate structure.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] In some embodiments, the shape of the electrode assembly may be flat or polygonal.

[0148] 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.

[0149] 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.

[0150] As an example, the battery cell may be a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0151] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0152] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0153] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0154] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0155] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0156] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, capacity, charge and discharge rate and other performance parameters.

[0157] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell. As the demand for the capacity of the battery cell becomes higher and higher, in a large-capacity battery cell in the related art, the electrode assembly of the battery cell is usually set to a laminated structure, that is, the electrode assembly is stacked with multiple positive plates and multiple negative plates, and the thickness of the stacked electrode assembly is increased to increase the capacity of the electrode assembly. However, for a battery cell with such a structure, when the stacking thickness of the electrode assembly is increased, the size of the electrode sheet needs to be correspondingly increased, which on the one hand easily leads to greater difficulty in the manufacturing process of the electrode sheet, and when the electrode sheets with larger sizes are stacked, the stacked surface is prone to unevenness, resulting in poor production quality of the electrode assembly. On the other hand, when the electrode sheets with larger sizes are stacked, the requirements for manufacturing equipment are higher, and the stacking difficulty is greater, which leads to greater difficulty in the assembly process of the battery cell, which is not conducive to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0158] Based on the above considerations, in order to solve the problem of the difficulty in manufacturing large-capacity battery cells, an embodiment of the present application provides a battery cell, which includes a housing, a first electrode terminal, a first current collecting member and a plurality of electrode assemblies. The housing has a wall portion. The first electrode terminal is mounted on the wall portion. A plurality of electrode assemblies are accommodated in the housing, and the plurality of electrode assemblies are stacked along a first direction. The electrode assembly includes a main body and a first pole ear. Along a second direction, the first pole ear is arranged at one end of the main body, and the first pole ears of the plurality of electrode assemblies are located at the same end of the main body. The second direction intersects with the first direction. The first current collecting member electrically connects the first electrode terminal and each first pole ear.

[0159] In a battery cell of this structure, a plurality of electrode assemblies stacked in a first direction are arranged in the shell of the battery cell, the first pole ears of the plurality of electrode assemblies are all located at the same end of the main body in the second direction, and the first pole ears of the plurality of electrode assemblies are all electrically connected to the first electrode terminal through the first current collecting member to realize the input or output of electric energy of the battery cell, and the plurality of electrode assemblies are stacked in the shell to increase the number of electrode assemblies accommodated in the shell of the battery cell, which is beneficial to increase the electric capacity of the battery cell. A battery cell adopting this structure only needs to stack a plurality of electrode assemblies in the shell and connect the first pole ears of the plurality of electrode assemblies through a first current collecting member to realize the input or output of electric energy of a large-capacity battery cell, without setting a plurality of first current collecting members in the shell to connect the first pole ears of the plurality of electrode assemblies, and without increasing the thickness or volume of a single electrode assembly, thereby effectively reducing the manufacturing difficulty of the electrode assembly, thereby reducing the manufacturing difficulty of large-capacity battery cells, which is beneficial to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0160] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the difficulty of manufacturing the battery cells during the assembly process, thereby improving the production efficiency of the battery cells and reducing the manufacturing cost of the battery cells.

[0161] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0162] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0163] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0164] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use 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.

[0165] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application is as follows. The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0166] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0167] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0168] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0169] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, and the busbar component is used to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0170] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a prism or other shapes. Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0171] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the electrode assembly 24 provided in some embodiments of the present application. Figure 6 Schematic diagram of the assembly of the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 provided for some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, a first electrode terminal 22, a first current collecting member 23 and a plurality of electrode assemblies 24. The housing 21 has a wall portion 211. The first electrode terminal 22 is mounted on the wall portion 211. A plurality of electrode assemblies 24 are accommodated in the housing 21, and the plurality of electrode assemblies 24 are stacked along a first direction X. The electrode assembly 24 includes a main body 241 and a first pole ear 242. Along a second direction Y, the first pole ear 242 is arranged at one end of the main body 241, and the first pole ears 242 of the plurality of electrode assemblies 24 are located at the same end of the main body 241. The second direction Y intersects with the first direction X. The first current collecting member 23 electrically connects the first electrode terminal 22 and each first pole ear 242.

[0172] The housing 21 may also be used to contain electrolytes, such as electrolytes, etc. The housing 21 may also be made of a variety of materials, such as copper, iron, aluminum, steel or aluminum alloys, etc.

[0173] In some embodiments, the housing 21 may include a shell 212 and an end cap 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 24, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cap 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 24 and the electrolyte.

[0174] When assembling the battery cell 20 , the electrode assembly 24 may be placed into the shell 212 first, and the shell 212 may be filled with electrolyte. Then, the end cap 213 may be covered on the opening 2121 of the shell 212 to complete the assembly of the battery cell 20 .

[0175] The shell 212 can be in various shapes, such as a rectangular parallelepiped or prism structure. The shape of the shell 212 can be determined according to the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 is a rectangular parallelepiped structure, a shell 212 with a rectangular parallelepiped structure can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4 In the embodiment, the shell 212 is a rectangular parallelepiped structure, and the end cover 213 is a plate-like structure.

[0176] It should be noted that the wall portion 211 for mounting the electrode terminal may be the end cover 213 of the housing 21 or a wall of the housing 212. Figure 3 and Figure 4 In the figure, the wall portion 211 is the end cover 213 of the outer shell 21. Of course, in some embodiments, the wall portion 211 can also be the bottom wall of the shell 212 of the outer shell 21 and the end cover 213 arranged opposite to each other, or the side wall of the shell 212 of the outer shell 21 and the end cover 213 connected and adjacent to each other.

[0177] Of course, it is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 may include a shell body 212 and two end caps 213. The shell body 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 corresponds to an opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 24 and the electrolyte. That is, the shell body 212 is formed with openings 2121 on opposite sides, and the two end caps 213 are respectively covered on the two sides of the shell body 212 to close the corresponding openings 2121.

[0178] The electrode assembly 24 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 24 can be of various types. For example, the electrode assembly 24 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[0179] Exemplarily, the isolation member is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0180] The electrode assembly 24 includes a main body 241 and a first pole ear 242 and a second pole ear 243 connected to the main body 241. The first pole ear 242 and the second pole ear 243 have opposite polarities, and the first pole ear 242 and the second pole ear 243 are respectively the positive electrode and the negative electrode of the electrode assembly 24. The main body 241 of the electrode assembly 24 is the main area where the chemical reaction of the electrode assembly 24 occurs in the battery cell 20. The main body 241 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the separator and the area of ​​the negative electrode sheet coated with the negative electrode active material layer, and mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet with opposite polarities to work.

[0181] Along the second direction Y, the first pole ear 242 is arranged at one end of the main body 241, and the first pole ears 242 of the multiple electrode assemblies 24 are located at the same end of the main body 241, that is, the first pole ear 242 is connected to one end of the main body 241 in the second direction Y, and in the multiple electrode assemblies 24, the multiple first pole ears 242 are all located at the same end of the corresponding main body 241.

[0182] Exemplarily, the second direction Y is perpendicular to the first direction X. The first direction X is the stacking direction of the plurality of electrode assemblies 24 and also the thickness direction of the main body 241 of the electrode assembly 24. The second direction Y is the arrangement direction of the first electrode tab 242 and the main body 241 of the electrode assembly 24.

[0183] The second pole ear 243 is also arranged at one end of the main body 241 in the second direction Y. The second pole ear 243 and the second pole ears 243 of multiple electrode assemblies 24 are located at the same end of the main body 241. It should be noted that the second pole ear 243 and the first pole ear 242 can be located at the same end of the main body 241 in the second direction Y, or can be located at both ends of the main body 241 in the second direction Y respectively.

[0184] The first pole tab 242 and the second pole tab 243 are respectively the positive electrode and the negative electrode of the electrode assembly 24. If the first pole tab 242 is the positive electrode of the electrode assembly 24, the first pole tab 242 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer, and correspondingly, if the second pole tab 243 is the negative electrode of the electrode assembly 24, the second pole tab 243 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer; if the first pole tab 242 is the negative electrode of the electrode assembly 24, the first pole tab 242 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer, and correspondingly, if the second pole tab 243 is the positive electrode of the electrode assembly 24, the second pole tab 243 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer.

[0185] The first electrode terminal 22 serves to output or input electrical energy of the battery cell 20 , and its material may be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0186] Exemplarily, the first electrode terminal 22 is insulated and mounted on the wall portion 211 , that is, no electrical connection is formed between the first electrode terminal 22 and the wall portion 211 .

[0187] Among them, Figure 3 and Figure 4 In the embodiment, the battery cell 20 may further include a second electrode terminal 25, which is insulated and installed on the wall portion 211. The second electrode terminal 25 and the first electrode terminal 22 are respectively used to input or output the positive electrode and the negative electrode of the battery cell 20, so that the first electrode terminal 22 and the second electrode terminal 25 cooperate to output or input the electric energy of the battery cell 20. Correspondingly, the battery cell 20 includes a first current collecting member 23 and a second current collecting member 26, and the first pole tabs 242 of the plurality of electrode assemblies 24 are connected to the first electrode terminal 22 through the first current collecting member 23, and the second pole tabs 243 of the plurality of electrode assemblies 24 are connected to the second electrode terminal 25 through the second current collecting member 26, so as to realize the input or output of the electric energy of the battery cell 20.

[0188] Exemplarily, the second electrode terminal 25 may be made of a variety of materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0189] It should be noted that when the first electrode terminal 22 is insulated and installed on the wall 211, the second electrode terminal 25 can be insulated and installed on the wall 211, or it can be directly installed on the wall 211, so that the second electrode terminal 25 is electrically connected to the wall 211, and the wall 211 and the second electrode terminal 25 carry the same charge. Similarly, when the second electrode terminal 25 is insulated and installed on the wall 211, the first electrode terminal 22 can be insulated and installed on the wall 211, or it can be directly installed on the wall 211, so that the first electrode terminal 22 is electrically connected to the wall 211, and the wall 211 and the second electrode terminal 25 carry the same charge.

[0190] The first electrode terminal 22 and the second electrode terminal 25 may be mounted on the housing 21 in various structures. For example, Figure 3 In the figure, the first electrode terminal 22 and the second electrode terminal 25 are both installed on the end cover 213 of the outer shell 21, that is, the outer shell 21 includes the end cover 213 and the shell 212, the shell 212 is a hollow structure with an opening 2121 at one end, the end cover 213 covers the opening 2121, and the end cover 213 is the wall portion 211. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the first electrode terminal 22 and the second electrode terminal 25 can also be installed on the shell 212 of the outer shell 21. Similarly, in some embodiments, the outer shell 21 can also be a hollow structure including the shell 212 and two end covers 213, with opposite ends of the shell 212 having openings 2121. The two end covers 213 respectively cover the openings 2121 at both ends of the shell 212, and the first electrode terminal 22 and the second electrode terminal 25 are respectively installed on the two end covers 213, that is, the outer shell 21 includes two wall portions 211, and the wall portion 211 is the end cover 213, so that the first electrode terminal 22 and the second electrode terminal 25 are respectively located on the opposite ends of the outer shell 21 in the thickness direction of the wall portion 211.

[0191] Among them, the first current collecting member 23 plays the role of connecting the first electrode terminal 22 and the first electrode tab 242 of the plurality of electrode assemblies 24, and the material of the first current collecting member 23 can be various, such as copper, iron, aluminum, steel or aluminum alloy, etc. Similarly, the second current collecting member 26 plays the role of connecting the second electrode terminal 25 and the second electrode tab 243 of the plurality of electrode assemblies 24, and the material of the second current collecting member 26 can also be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0192] In some embodiments, the battery cell 20 may further include a pressure relief mechanism disposed on the housing 21 , and configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0193] Optionally, the pressure relief mechanism may be disposed on the end cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21. Similarly, the pressure relief mechanism and the housing 21 may be an integrally formed structure, or may be a separately provided structure. If the pressure relief mechanism and the housing 21 are an integrally formed structure, the pressure relief mechanism is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notched groove is provided. If the pressure relief mechanism and the housing 21 are a separate structure, the pressure relief mechanism may be connected to the housing 21 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.

[0194] A plurality of electrode assemblies 24 stacked in a first direction X are arranged in the outer shell 21 of the battery cell 20, and the first pole ears 242 of the plurality of electrode assemblies 24 are all located at the same end of the main body 241 in the second direction Y, and the first pole ears 242 of the plurality of electrode assemblies 24 are all electrically connected to the first electrode terminal 22 through the first current collecting member 23 to realize the input or output of electric energy of the battery cell 20. By stacking the plurality of electrode assemblies 24 in the outer shell 21, the number of electrode assemblies 24 accommodated in the outer shell 21 of the battery cell 20 is increased, thereby facilitating the improvement of the electric capacity of the battery cell 20. The battery cell 20 adopting such a structure It is only necessary to stack a plurality of electrode assemblies 24 in the outer shell 21 and connect the first pole ears 242 of the plurality of electrode assemblies 24 through a first current collecting component 23 to realize the input or output of electric energy of a large-capacity battery cell 20. There is no need to set a plurality of first current collecting components 23 in the outer shell 21 to connect the first pole ears 242 of the plurality of electrode assemblies 24, and there is no need to increase the thickness or volume of a single electrode assembly 24, thereby effectively reducing the manufacturing difficulty of the electrode assembly 24, thereby reducing the manufacturing difficulty of the large-capacity battery cell 20, which is beneficial to improving the production efficiency of the battery cell 20 and reducing the manufacturing cost of the battery cell 20.

[0195] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, along the second direction Y, at least part of the first current collecting member 23 is located on a side of the body 241 where the first electrode tab 242 is provided, and part of the first electrode tab 242 is located on a side of the first current collecting member 23 away from the body 241 and connected to the first current collecting member 23 .

[0196] Among them, at least part of the first current collecting member 23 is located on the side of the main body 241 where the first pole tab 242 is provided, that is, the first current collecting member 23 may be entirely located on the side of the main body 241 where the first pole tab 242 is provided, or may be only partially located on the side of the main body 241 where the first pole tab 242 is provided. Of course, in the structure where at least part of the first current collecting member 23 is located on the side of the main body 241 where the first pole tab 242 is provided, the first current collecting member 23 may be located inside the housing 21, or may be located outside the housing 21.

[0197] Part of the first electrode tab 242 is located at a side of the first current collecting member 23 away from the main body 241 and connected to the first current collecting member 23, that is, the first electrode tab 242 is connected to the side of the first current collecting member 23 away from the main body 241. Optionally, the structure in which the part of the first electrode tab 242 is located at a side of the first current collecting member 23 away from the main body 241 and connected to the first current collecting member 23 may be various, for example, the first electrode tab 242 may be a structure in which the first electrode tab 242 passes around the edge of the first current collecting member 23 from the side facing the main body 241 of the first current collecting member 23 and then is connected to the side of the first current collecting member 23 away from the main body 241, or a channel for the first electrode tab 242 to pass through is provided on the first current collecting member 23, so that the first electrode tab 242 passes through the first current collecting member 23 and then is connected to the side of the first current collecting member 23 away from the main body 241.

[0198] By setting at least a portion of the first current collecting member 23 to be located on a side of the main body 241 where the first pole ear 242 is provided, so as to facilitate the connection between the first current collecting member 23 and the first pole ear 242, it is helpful to reduce the difficulty of assembling the first current collecting member 23 and the first pole ear 242. Specifically, by setting a portion of the first pole ear 242 to be located on a side of the first current collecting member 23 away from the main body 241 in the second direction Y, and the portion is connected to the first current collecting member 23, so that the first pole ear 242 is a structure that bypasses the first current collecting member 23 and is connected to the side of the first current collecting member 23 away from the main body 241. On the one hand, it can reduce the difficulty of connecting the first pole ear 242 and the first current collecting member 23. On the other hand, it can reduce the phenomenon that the first current collecting member 23 presses the first pole ear 242 downward toward the side close to the main body 241, so as to reduce the risk of short circuit caused by the first pole ear 242 being inserted upside down into the main body 241.

[0199] According to some embodiments of the present application, referring to Figure 4 and Figure 6 , and please refer to Figure 7 , Figure 7A schematic diagram of the structure of the first current collecting member 23 of the battery cell 20 provided in some embodiments of the present application. The first current collecting member 23 is provided with a first avoidance area 231, the first avoidance area 231 penetrates the first current collecting member 23 along the second direction Y, and the first pole lug 242 passes through the first avoidance area 231 and is connected to the side of the first current collecting member 23 away from the main body 241.

[0200] The first avoidance area 231 penetrates the first current collecting member 23 along the second direction Y, that is, the first avoidance area 231 penetrates the surfaces of both sides of the first current collecting member 23 in the second direction Y.

[0201] Optionally, the first current collecting member 23 may have multiple structures in which the first avoidance area 231 is provided. The first current collecting member 23 may have only one first avoidance area 231, so that the first pole ears 242 of multiple electrode assemblies 24 all pass through the first current collecting member 23 through the same first avoidance area 231 and then are connected to the side of the first current collecting member 23 away from the main body 241. The first current collecting member 23 may have a first avoidance area 231 provided for the first pole ear 242 of each electrode assembly 24. The first current collecting member 23 may have multiple first avoidance areas 231 provided, and each first avoidance area 231 may allow the first pole ear 242 of one electrode assembly 24 or the first pole ears 242 of multiple electrode assemblies 24 to pass through.

[0202] Exemplarily, a row of first avoidance areas 231 is provided on the first current collecting component 23 corresponding to the first electrode ears 242 of the plurality of electrode assemblies 24, and each row of first avoidance areas 231 includes a plurality of first avoidance areas 231 arranged at intervals along the first direction X, and the first electrode ears 242 of two adjacent electrode assemblies 24 among the plurality of electrode assemblies 24 pass through the first current collecting component 23 through a first avoidance area 231 and are connected to a side of the first current collecting component 23 away from the main body 241.

[0203] By setting the first avoidance area 231 on the first current collecting member 23, and the first avoidance area 231 passes through both sides of the first current collecting member 23 along the second direction Y, the first pole ear 242 can pass through the first avoidance area 231 and then be connected to the side of the first current collecting member 23 away from the main body 241. The battery cell 20 adopting this structure is convenient for setting the first pole ear 242 to be connected to the side of the first current collecting member 23 away from the main body 241, which can reduce the difficulty of the first pole ear 242 bypassing the first current collecting member 23, and can optimize the length of the first pole ear 242 bypassing the first current collecting member 23, thereby alleviating the redundancy of the first pole ear 242 and reducing the manufacturing cost of the battery cell 20.

[0204] In some embodiments, see Figure 7As shown, the first avoidance area 231 is a through hole provided on the first current collecting member 23. Of course, in other embodiments, the first avoidance area 231 can also be other structures, for example, referring to Figure 8 , Figure 8 A schematic structural diagram of the first current collecting component 23 of the battery cell 20 provided in some embodiments of the present application in other embodiments, the first avoidance area 231 is a notch arranged on the edge of the first current collecting component 23, that is, the first avoidance area 231 is a notch arranged on the surface of the edge of the first current collecting component 23 in the third direction Z, and the notch runs through both sides of the first current collecting component 23 along the second direction Y.

[0205] The first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. Exemplarily, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0206] The first avoidance area 231 can be a through hole set on the first current collecting component 23 or a notch set at the edge of the first current collecting component 23, so that the first electrode ear 242 can pass through the first avoidance area 231 and connect to the side of the first current collecting component 23 away from the main body 241. The structure is simple and easy to manufacture.

[0207] In some embodiments, see Figure 3 and Figure 4 As shown, the first current collecting member 23 is disposed in the outer shell 21 , that is, the first current collecting member 23 is disposed between the main body 241 of the electrode assembly 24 and the outer shell 21 .

[0208] By arranging the first current collecting member 23 inside the outer shell 21, it is helpful to reduce the difficulty of assembling the first electrode tab 242 electrically connected to the first electrode terminal 22 through the first current collecting member 23, so as to improve the production efficiency of the battery cell 20, and the outer shell 21 can play a certain protective role on the first current collecting member 23, so as to reduce the wear or damage of the first current collecting member 23 during use.

[0209] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also be other structures. For example, along the second direction Y, a first channel for each first pole ear 242 to extend out is provided on one side of the outer shell 21 close to the first pole ear 242, and each first pole ear 242 can extend out of the outer shell 21 through the corresponding first channel. The first current collecting component 23 is provided on the outside of the outer shell 21, and the first current collecting component 23 is electrically connected to the extended first pole ear 242.

[0210] Among them, along the second direction Y, a first channel for each first pole ear 242 to extend out is provided on one side of the shell 21 close to the first pole ear 242, that is, the area of ​​the shell 21 facing the side of the main body 241 provided with the first pole ear 242 in the second direction Y is provided with a first channel for the first pole ear 242 to pass through, so that the first pole ears 242 of the plurality of electrode assemblies 24 can extend out of the shell 21 and then be connected to the first current collecting component 23 located outside the shell 21, and the first current collecting component 23 is connected to the first electrode terminal 22 outside the shell 21.

[0211] Exemplarily, the housing 21 may be provided with a plurality of first holes, and the first holes correspond to the first pole ears 242 one by one, so that the first pole ears 242 of each electrode assembly 24 can extend out of the housing 21 through a first hole, which is helpful to reduce the interference between the first pole ears 242 of the plurality of electrode assemblies 24. Of course, in other embodiments, only one first hole may be provided on the housing 21, and the first pole ears 242 of the plurality of electrode assemblies 24 may extend out of the housing 21 through the same first hole.

[0212] By arranging the first current collecting component 23 outside the shell 21 and providing a first hole for the first pole ear 242 to pass through on the shell 21, the first pole ear 242 can be electrically connected to the first electrode terminal 22 through the first current collecting component 23 after passing through the shell 21. The battery cell 20 adopting this structure is convenient for later inspection of the first current collecting component 23, and is convenient for maintenance and replacement of the first current collecting component 23, which is beneficial to reducing the maintenance cost of the battery cell 20.

[0213] According to some embodiments of the present application, see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the electrode assembly 24 further includes a second pole tab 243, which is disposed at one end of the main body 241 along the second direction Y, and the second pole tabs 243 of the plurality of electrode assemblies 24 are located at the same end of the main body 241, and the polarity of the second pole tab 243 is opposite to the polarity of the first pole tab 242. The battery cell 20 further includes a second electrode terminal 25 and a second current collecting member 26, the second electrode terminal 25 is mounted on the wall 211, and the second current collecting member 26 electrically connects the second electrode terminal 25 and each second pole tab 243.

[0214] Among them, along the second direction Y, the second pole ear 243 is arranged at one end of the main body 241, and the second pole ears 243 of the multiple electrode assemblies 24 are located at the same end of the main body 241, that is, the second pole ear 243 is connected to one end of the main body 241 in the second direction Y, and in the multiple electrode assemblies 24, the multiple second pole ears 243 are all located at the same end of the corresponding main body 241.

[0215] The polarity of the second electrode tab 243 is opposite to that of the first electrode tab 242 , that is, the first electrode tab 242 and the second electrode tab 243 are respectively the positive electrode and the negative electrode of the electrode assembly 24 .

[0216] Exemplarily, the second electrode terminal 25 is insulated and installed on the wall portion 211 , that is, no electrical connection is formed between the first electrode terminal 22 and the wall portion 211 .

[0217] It should be noted that the first pole tab 242 and the second pole tab 243 may be disposed at the same end of the main body 241 in the second direction Y, or may be disposed at two ends of the main body 241 in the second direction Y. Figure 4 In the embodiment, the first electrode tab 242 and the second electrode tab 243 are both disposed at one end of the main body 241 facing the wall 211 in the second direction Y.

[0218] The electrode assembly 24 is also provided with a second pole ear 243 having a polarity opposite to that of the first pole ear 242. The second pole ears 243 of the plurality of electrode assemblies 24 are all located at the same end of the main body 241 in the second direction Y, and the second pole ears 243 of the plurality of electrode assemblies 24 are all electrically connected to the second electrode terminal 25 through the second current collecting member 26 to realize the input or output of electric energy of the battery cell 20. The battery cell 20 adopting this structure only needs to stack a plurality of electrode assemblies 24 in the outer shell 21 and connect the second pole ears 243 of the plurality of electrode assemblies 24 through a second current collecting member 26 to realize the input or output of electric energy of the large-capacity battery cell 20. There is no need to set a plurality of second current collecting members 26 in the outer shell 21 to connect the second pole ears 243 of the plurality of electrode assemblies 24, and there is no need to increase the thickness or volume of a single electrode assembly 24, thereby effectively reducing the manufacturing difficulty of the electrode assembly 24, so as to reduce the manufacturing difficulty of the large-capacity battery cell 20, which is beneficial to improving the production efficiency of the battery cell 20 and reducing the manufacturing cost of the battery cell 20.

[0219] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, along the second direction Y, at least part of the second current collecting member 26 is located on the side of the body 241 where the second electrode tab 243 is provided, and part of the second electrode tab 243 is located on the side of the second current collecting member 26 away from the body 241 and connected to the second current collecting member 26 .

[0220] Among them, at least part of the second current collecting member 26 is located on the side of the main body 241 where the second pole tab 243 is provided, that is, the second current collecting member 26 may be entirely located on the side of the main body 241 where the second pole tab 243 is provided, or may be only partially located on the side of the main body 241 where the second pole tab 243 is provided. Of course, in the structure where at least part of the second current collecting member 26 is located on the side of the main body 241 where the second pole tab 243 is provided, the second current collecting member 26 may be located inside the housing 21, or may be located outside the housing 21.

[0221] Part of the second pole tab 243 is located on the side of the second current collecting member 26 away from the main body 241 and connected to the second current collecting member 26, that is, the second pole tab 243 is connected to the side of the second current collecting member 26 away from the main body 241. Optionally, the structure in which the second pole tab 243 is located on the side of the second current collecting member 26 away from the main body 241 and connected to the second current collecting member 26 can be various, for example, the second pole tab 243 can be connected to the side of the second current collecting member 26 away from the main body 241 after bypassing the edge of the second current collecting member 26 from the side of the second current collecting member 26 facing the main body 241, or the second current collecting member 26 can be provided with a channel for the second pole tab 243 to pass through, so that the second pole tab 243 passes through the second current collecting member 26 and then connected to the side of the second current collecting member 26 away from the main body 241.

[0222] By setting at least a portion of the second current collecting member 26 to be located on the side of the main body 241 where the second pole ear 243 is provided, so as to facilitate the connection between the second current collecting member 26 and the second pole ear 243, it is helpful to reduce the difficulty of assembling the second current collecting member 26 and the second pole ear 243. Specifically, by setting a portion of the second pole ear 243 to be located on the side of the second current collecting member 26 away from the main body 241 in the second direction Y, and the portion is connected to the second current collecting member 26, so that the second pole ear 243 is a structure that bypasses the second current collecting member 26 and is connected to the side of the second current collecting member 26 away from the main body 241. On the one hand, it can reduce the difficulty of connecting the second pole ear 243 with the second current collecting member 26, and on the other hand, it can reduce the phenomenon that the second current collecting member 26 presses the second pole ear 243 in the direction close to the main body 241, so as to reduce the risk of short circuit caused by the second pole ear 243 being inserted upside down into the main body 241.

[0223] According to some embodiments of the present application, referring to Figure 4 and Figure 6 , and please refer to Fig. 9 , Fig. 9A schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided in some embodiments of the present application. The second current collecting member 26 is provided with a second avoidance area 261, which penetrates the second current collecting member 26 along the second direction Y, and the second pole lug 243 passes through the second avoidance area 261 and is connected to the side of the second current collecting member 26 away from the main body 241.

[0224] The second avoidance area 261 penetrates the second current collecting member 26 along the second direction Y, that is, the second avoidance area 261 penetrates the surfaces of both sides of the second current collecting member 26 in the second direction Y.

[0225] Optionally, the second current collecting member 26 may have various structures in which the second avoidance area 261 is provided. The second current collecting member 26 may have only one second avoidance area 261, so that the second pole ears 243 of multiple electrode assemblies 24 all pass through the second current collecting member 26 through the same second avoidance area 261 and then are connected to the side of the second current collecting member 26 away from the main body 241. The second current collecting member 26 may have a second avoidance area 261 provided for the second pole ear 243 of each electrode assembly 24. The second current collecting member 26 may have multiple second avoidance areas 261 provided, and each second avoidance area 261 can allow the second pole ear 243 of one electrode assembly 24 or the second pole ears 243 of multiple electrode assemblies 24 to pass through.

[0226] Exemplarily, a row of second avoidance areas 261 is provided on the second current collecting member 26 corresponding to the second pole ears 243 of the plurality of electrode assemblies 24, and each row of second avoidance areas 261 includes a plurality of second avoidance areas 261 arranged at intervals along the first direction X, and the second pole ears 243 of two adjacent electrode assemblies 24 among the plurality of electrode assemblies 24 pass through the second current collecting member 26 through a second avoidance area 261 and are connected to the side of the second current collecting member 26 away from the main body 241.

[0227] By setting a second avoidance area 261 on the second current collecting member 26, and the second avoidance area 261 passes through both sides of the second current collecting member 26 along the second direction Y, the second pole ear 243 can pass through the second avoidance area 261 and then be connected to the side of the second current collecting member 26 away from the main body 241. The battery cell 20 adopting this structure is convenient for setting the second pole ear 243 to be connected to the side of the second current collecting member 26 away from the main body 241, which can reduce the difficulty of the second pole ear 243 bypassing the second current collecting member 26, and can optimize the length of the second pole ear 243 bypassing the second current collecting member 26, thereby alleviating the redundancy of the second pole ear 243 and reducing the manufacturing cost of the battery cell 20.

[0228] In some embodiments, see Fig. 9As shown, the second avoidance area 261 is a through hole provided on the second current collecting member 26. Of course, in other embodiments, the second avoidance area 261 can also be other structures, for example, the second avoidance area 261 is a notch provided on the edge of the second current collecting member 26, that is, the second avoidance area 261 is a notch provided on the surface of the edge of the second current collecting member 26 in the third direction Z, and the notch runs through both sides of the second current collecting member 26 along the second direction Y.

[0229] The second avoidance area 261 can be a through hole set on the second current collecting member 26 or a notch set at the edge of the second current collecting member 26, so that the second electrode tab 243 can pass through the second avoidance area 261 and connect to the side of the second current collecting member 26 away from the main body 241. The structure is simple and easy to manufacture.

[0230] In some embodiments, see Figure 3 and Figure 4 As shown, the second current collecting member 26 is disposed in the outer shell 21 , that is, the second current collecting member 26 is disposed between the main body 241 of the electrode assembly 24 and the outer shell 21 .

[0231] By arranging the second current collecting member 26 inside the outer shell 21, it is helpful to reduce the difficulty of assembling the second electrode tab 243 and electrically connecting it with the second electrode terminal 25 through the second current collecting member 26, so as to improve the production efficiency of the battery cell 20. In addition, the outer shell 21 can provide a certain degree of protection for the second current collecting member 26, so as to reduce the phenomenon of wear or damage of the second current collecting member 26 during use.

[0232] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also be other structures. For example, along the second direction Y, a second channel for each second pole ear 243 to extend is provided on one side of the shell 21 close to the second pole ear 243, and each second pole ear 243 can extend out of the shell 21 through the corresponding second channel. The second current collecting component 26 is provided on the outside of the shell 21, and the second current collecting component 26 is electrically connected to the extended second pole ear 243.

[0233] Among them, along the second direction Y, a side of the shell 21 close to the second pole ear 243 is provided with a second channel for each second pole ear 243 to extend out, that is, the area of ​​the shell 21 facing the side of the main body 241 provided with the second pole ear 243 in the second direction Y is provided with a second channel for the second pole ear 243 to pass through, so that the second pole ears 243 of the plurality of electrode assemblies 24 can extend out of the shell 21 and then be connected to the second current collecting component 26 located outside the shell 21, and the second current collecting component 26 is connected to the second electrode terminal 25 outside the shell 21.

[0234] Exemplarily, the housing 21 may be provided with a plurality of second holes, and the second holes correspond to the second pole ears 243 one by one, so that the second pole ears 243 of each electrode assembly 24 can extend out of the housing 21 through a second hole, which is helpful to reduce the interference between the second pole ears 243 of the plurality of electrode assemblies 24. Of course, in other embodiments, only one second hole may be provided on the housing 21, and the second pole ears 243 of the plurality of electrode assemblies 24 may extend out of the housing 21 through the same second hole.

[0235] By arranging the second current collecting member 26 outside the outer shell 21 and providing a second hole on the outer shell 21 for the second pole ear 243 to pass through, the second pole ear 243 can be electrically connected to the second electrode terminal 25 through the second current collecting member 26 after passing through the outer shell 21. The battery cell 20 adopting this structure is convenient for later inspection of the second current collecting member 26, and is convenient for maintenance and replacement of the second current collecting member 26, which is beneficial to reducing the maintenance cost of the battery cell 20.

[0236] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, along the second direction Y, the first pole tab 242 and the second pole tab 243 are both disposed at the same end of the main body 241, and the first pole tab 242 and the second pole tab 243 are arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. The first current collecting member 23 includes a first connecting portion 232 electrically connecting each first pole tab 242, and the second current collecting member 26 includes a second connecting portion 262 electrically connecting each second pole tab 243, and the first connecting portion 232 and the second connecting portion 262 are both located on one side of the main body 241 on which the first pole tab 242 and the second pole tab 243 are disposed in the second direction Y, and the first connecting portion 232 and the second connecting portion 262 are arranged at intervals along the third direction Z.

[0237] Among them, the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other, that is, the first direction X, the second direction Y and the third direction Z are all intersected by each other, and every two directions form a plane, so that the three planes formed by the three directions are not coplanar. Exemplarily, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0238] The first current collecting member 23 includes a first connection portion 232, which is a portion of the first current collecting member 23 located on one side of the main body 241 provided with the first pole tab 242 in the second direction Y, and the first connection portion 232 plays a role in connecting the first pole tabs 242 of the plurality of electrode assemblies 24. Similarly, the second current collecting member 26 includes a second connection portion 262, which is a portion of the second current collecting member 26 located on one side of the main body 241 provided with the second pole tab 243 in the second direction Y, and the second connection portion 262 plays a role in connecting the second pole tabs 243 of the plurality of electrode assemblies 24.

[0239] The first connection portion 232 serves to connect the first pole tabs 242 of the plurality of electrode assemblies 24, and the connection structure between the first connection portion 232 and the first pole tab 242 can be various, such as welding connection, abutment connection, or bolt screw connection, etc. Similarly, the second connection portion 262 serves to connect the second pole tabs 243 of the plurality of electrode assemblies 24, and the connection structure between the second connection portion 262 and the second pole tab 243 can be various, such as welding connection, abutment connection, or bolt screw connection, etc.

[0240] Optionally, in an embodiment where the first pole ear 242 and the second pole ear 243 are both arranged at the same end of the main body 241 along the second direction Y, the wall portion 211 can be located on the side of the main body 241 where the first pole ear 242 and the second pole ear 243 are arranged in the second direction Y, or it can be arranged on one side of the multiple electrode assemblies 24 in the first direction X.

[0241] For example, in Figure 4 In the embodiment, the wall portion 211 is located on the side of the main body 241 where the first pole lug 242 and the second pole lug 243 are provided in the second direction Y. Correspondingly, the first current collecting member 23 and the second current collecting member 26 are both arranged as a whole on the side of the main body 241 where the first pole lug 242 and the second pole lug 243 are provided. That is to say, in this embodiment, the first current collecting member 23 only includes the first connecting portion 232, and the first connecting portion 232 connects the first pole lug 242 and the first electrode terminal 22. Similarly, the second current collecting member 26 only includes the second connecting portion 262, and the second connecting portion 262 connects the second pole lug 243 and the second electrode terminal 25.

[0242] For example, in Figure 4In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21, so that the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 are both located between the main body 241 and the wall 211. Of course, in the embodiment where the first current collecting member 23 and the second current collecting member 26 are both disposed outside the housing 21, the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 are both located on the side of the wall 211 away from the main body 241.

[0243] In some embodiments, reference Fig.10 and Fig.11 , Fig.10 This is a schematic diagram of the structure of a battery cell 20 provided in some other embodiments of the present application. Fig.11 The structural exploded diagram of the battery cell 20 provided in some other embodiments of the present application. The wall portion 211 is disposed on one side of the plurality of electrode assemblies 24 in the first direction X. In this embodiment, the first connection portion 232 is a portion of the first current collecting member 23 located on a side of the main body 241 provided with the first pole tab 242 in the second direction Y and connected to the first pole tab 242, and the second connection portion 262 is a portion of the second current collecting member 26 located on a side of the main body 241 provided with the second pole tab 243 in the second direction Y and connected to the second pole tab 243.

[0244] It should be noted that, in the embodiment in which the first avoidance area 231 is provided on the first current collecting member 23, the first avoidance area 231 is provided on the first connecting portion 232 of the first current collecting member 23, that is, the first avoidance area 231 penetrates both sides of the first connecting portion 232 along the second direction Y, so that the first pole tab 242 passes through the first avoidance area 231 and is connected to the side of the first connecting portion 232 away from the main body 241. Similarly, in the embodiment in which the second avoidance area 261 is provided on the second current collecting member 26, the second avoidance area 261 is provided on the second connecting portion 262 of the second current collecting member 26, that is, the second avoidance area 261 penetrates both sides of the second connecting portion 262 along the second direction Y, so that the second pole tab 243 passes through the second avoidance area 261 and is connected to the side of the second connecting portion 262 away from the main body 241.

[0245] By arranging the first pole lug 242 and the second pole lug 243 at the same end of the main body 241 in the second direction Y, and the first connecting portion 232 of the first current collecting member 23 and the second connecting portion 262 of the second current collecting member 26 are both located on the side of the main body 241 where the first pole lug 242 and the second pole lug 243 are arranged, on the one hand, it is convenient to connect the first current collecting member 23 with the first pole lug 242, and to connect the second current collecting member 26 with the second pole lug 243, which is conducive to reducing the difficulty of assembling the first current collecting member 23 and the second current collecting member 26. On the other hand, the first current collecting member 23 and the second current collecting member 26 can share space in the second direction Y, which is conducive to saving the space occupied by the first current collecting member 23 and the second current collecting member 26 in the second direction Y, thereby improving the space utilization rate of the battery cell 20 and improving the energy density of the battery cell 20.

[0246] According to some embodiments of the present application, see Figure 4 and Fig.11 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a first insulating member 27, which is arranged along the second direction Y on the side of the first connection part 232 and the second connection part 262 away from the main body part 241 to insulate and isolate the first connection part 232 and the outer shell 21 as well as the second connection part 262 and the outer shell 21.

[0247] Among them, the first insulating member 27 is arranged along the second direction Y on the side of the first connection part 232 and the second connection part 262 away from the main body 241, that is, in the second direction Y, the first connection part 232 of the first current collecting member 23 and the second connection part 262 of the second current collecting member 26 are located between the main body 241 and the first insulating member 27, so that the first connection part 232 and the second connection part 262 can be insulated and isolated from the outer shell 21 by the first insulating member 27.

[0248] Exemplarily, the first insulating member 27 may be made of various materials, such as rubber, silicone or plastic.

[0249] The battery cell 20 is also provided with a first insulating member 27, and the first insulating member 27 is arranged on the side of the first connection portion 232 and the second connection portion 262 away from the main body 241, so that the first insulating member 27 is located between the first connection portion 232 and the second connection portion 262 and the outer shell 21 in the second direction Y. The battery cell 20 adopting this structure can, on the one hand, realize the insulation isolation between the first connection portion 232 and the outer shell 21 and between the second connection portion 262 and the outer shell 21, which is beneficial to reduce the short circuit risk between the first current collecting member 23 and the second current collecting member 26 and the outer shell 21. On the other hand, it can realize that the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 share a first insulating member 27, which is beneficial to optimize the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0250] According to some embodiments of this application, please continue to refer to Figure 4 and Fig.11 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a second insulating member 28, which is arranged between the first connection part 232 and the second connection part 262 and the main body 241 along the second direction Y to insulate and isolate the first connection part 232 and the main body 241 and the second connection part 262 and the main body 241.

[0251] Among them, the second insulating member 28 is arranged between the first connecting part 232 and the second connecting part 262 and the main body 241 along the second direction Y, that is, in the second direction Y, the second insulating member 28 is arranged on the side of the first connecting part 232 and the second connecting part 262 facing the main body 241, so that the main body 241 and the first connecting part 232 and the main body 241 and the second connecting part 262 are respectively located on both sides of the second insulating member 28, so as to insulate and isolate the first connecting part 232 from the main body 241 and the second connecting part 262 from the main body 241 through the second insulating member 28.

[0252] Exemplarily, the second insulating member 28 may be made of various materials, such as rubber, silicone or plastic.

[0253] The battery cell 20 is also provided with a second insulating member 28, and the second insulating member 28 is arranged on the side of the first connection portion 232 and the second connection portion 262 facing the main body 241, so that the second insulating member 28 is located between the first connection portion 232 and the second connection portion 262 and the main body 241 in the second direction Y. The battery cell 20 adopting this structure can, on the one hand, realize the insulation isolation between the first connection portion 232 and the main body 241 and between the second connection portion 262 and the main body 241, which is beneficial to reduce the short circuit risk between the first current collecting member 23 and the second current collecting member 26 and the main body 241. On the other hand, it can realize that the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 share a second insulating member 28, which is beneficial to optimize the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0254] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, along the second direction Y, the wall portion 211 is located on one side of the plurality of electrode assemblies 24 , the first electrode tab 242 and the second electrode tab 243 are both disposed at one end of the main body 241 facing the wall portion 211 , and the first current collecting member 23 and the second current collecting member 26 are both disposed at one side of the main body 241 facing the wall portion 211 .

[0255] Among them, the first pole ear 242 and the second pole ear 243 are both arranged at the end of the main body 241 facing the wall portion 211, that is, the arrangement direction of the main body 241 and the wall portion 211 of the electrode assembly 24 is the same as the arrangement direction of the main body 241 and the first pole ear 242 and the second pole ear 243 of the electrode assembly 24, so that the main body 241 and the wall portion 211 are a structure arranged along the second direction Y, and the first pole ear 242 and the second pole ear 243 are both connected to the end of the main body 241 facing the wall portion 211.

[0256] The first current collecting member 23 and the second current collecting member 26 are both arranged on the side of the main body 241 facing the wall 211, that is, the first current collecting member 23 and the wall 211 are arranged along the second direction Y at one end of the main body 241 provided with the first pole ear 242, and the second current collecting member 26 and the wall 211 are also arranged along the second direction Y at one end of the main body 241 provided with the second pole ear 243.

[0257] For example, in Figure 4In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21, that is, the first current collecting member 23 and the second current collecting member 26 are disposed between the main body 241 and the wall 211 in the second direction Y. Of course, in the embodiment where the first current collecting member 23 and the second current collecting member 26 are both disposed outside the housing 21, the first current collecting member 23 and the second current collecting member 26 are both disposed on the side of the wall 211 away from the main body 241, so that the wall 211 is located between the main body 241 and the first current collecting member 23 and the second current collecting member 26 in the second direction Y.

[0258] The wall portion 211 is located on one side of the plurality of electrode assemblies 24 on which the first pole lug 242 and the second pole lug 243 are provided in the second direction Y, and the first current collecting member 23 and the second current collecting member 26 are both provided on the side of the main body 241 facing the wall portion 211. On the one hand, it is convenient for the first current collecting member 23 to connect the first pole lug 242 and the first electrode terminal 22 provided on the wall portion 211, and it is convenient for the second current collecting member 26 to connect the second pole lug 243 and the second electrode terminal 25 provided on the wall portion 211, which is beneficial to reducing the difficulty of assembling the battery cell 20. On the other hand, it is possible to realize that the first current collecting member 23 and the second current collecting member 26 are integrally provided on the side of the main body 241 facing the wall portion 211, which is beneficial to saving the space occupied by the first current collecting member 23 and the second current collecting member 26, so as to improve the energy density of the battery cell 20.

[0259] In some embodiments, see Figure 4 , Figure 6 and Figure 7 As shown, along the second direction Y, a first protrusion 234 is protruded from one side of the first current collecting member 23 facing the wall portion 211 , and the first protrusion 234 is connected to the first electrode terminal 22 .

[0260] Exemplarily, the first current collecting member 23 is disposed inside the housing 21, and correspondingly, the first protrusion 234 is protruded on the side of the first current collecting member 23 away from the main body 241. Of course, in the embodiment where the first current collecting member 23 is disposed outside the housing 21, the first current collecting member 23 is located on the side of the wall 211 away from the main body 241, and the first protrusion 234 is protruded on the side of the first current collecting member 23 facing the main body 241.

[0261] Illustratively, the first current collecting member 23 is welded to the first electrode terminal 22 through the first protrusion 234 .

[0262] The first current collecting member 23 is provided with a first protrusion 234 on one side facing the wall portion 211 in the second direction Y, and the first protrusion 234 is interconnected with the first electrode terminal 22 to achieve electrical connection between the first current collecting member 23 and the first electrode terminal 22. The first current collecting member 23 with such a structure can reduce the difficulty of assembling the first current collecting member 23 and the first electrode terminal 22, and the structure in which the first protrusion 234 and the first electrode terminal 22 are interconnected can improve the connection reliability between the first current collecting member 23 and the first electrode terminal 22.

[0263] In some embodiments, see Figure 4 , Figure 6 and Fig. 9 As shown, along the second direction Y, a second protrusion 264 is protruded from one side of the second current collecting member 26 facing the wall portion 211 , and the second protrusion 264 is connected to the second electrode terminal 25 .

[0264] Exemplarily, the second current collecting member 26 is disposed inside the housing 21, and correspondingly, the second protrusion 264 is protruded on the side of the second current collecting member 26 away from the main body 241. Of course, in the embodiment where the second current collecting member 26 is disposed outside the housing 21, the second current collecting member 26 is located on the side of the wall portion 211 away from the main body 241, and the second protrusion 264 is protruded on the side of the second current collecting member 26 facing the main body 241.

[0265] Illustratively, the second current collecting member 26 is welded to the second electrode terminal 25 through the second protrusion 264 .

[0266] The second current collecting member 26 is provided with a second protrusion 264 on one side facing the wall portion 211 in the second direction Y, and the second protrusion 264 is interconnected with the second electrode terminal 25 to achieve electrical connection between the second current collecting member 26 and the second electrode terminal 25. The second current collecting member 26 with such a structure can reduce the difficulty of assembling the second current collecting member 26 and the second electrode terminal 25, and the structure in which the second protrusion 264 and the second electrode terminal 25 are interconnected can improve the connection reliability between the second current collecting member 26 and the second electrode terminal 25.

[0267] According to some embodiments of the present application, referring to Fig.10 and Fig.11 , and please refer to Fig.12 , Fig.13 and Fig.14 , Fig.12 Schematic diagram of assembling the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 provided in some other embodiments of the present application, Fig.13 This is a schematic structural diagram of a first current collecting member 23 of a battery cell 20 provided in some other embodiments of the present application. Fig.14A schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided for some other embodiments of the present application. Along the first direction X, the wall portion 211 is located on at least one side of the plurality of electrode assemblies 24. The first current collecting member 23 also includes a third connection portion 233 connected to the first connection portion 232, the third connection portion 233 is located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the third connection portion 233 is connected to the first electrode terminal 22. The second current collecting member 26 also includes a fourth connection portion 263 connected to the second connection portion 262, the fourth connection portion 263 is located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the fourth connection portion 263 is connected to the second electrode terminal 25.

[0268] Among them, along the first direction X, the wall portion 211 is located on at least one side of the multiple electrode assemblies 24, that is, the wall of the outer shell 21 located on one side of the multiple electrode assemblies 24 in the first direction X is the wall portion 211, so that the first electrode terminal 22 is located on one side of the multiple electrode assemblies 24 in the first direction X, and the second electrode terminal 25 is located on one side of the multiple electrode assemblies 24 in the first direction X.

[0269] For example, in Fig.10 and Fig.11 In the embodiment, the battery cell 20 is provided with only one wall portion 211, and the first electrode terminal 22 and the second electrode terminal 25 are both installed on the one wall portion 211, so that the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the side of the multiple electrode assemblies 24 facing the wall portion 211 in the first direction X.

[0270] Of course, the structure of the battery cell 20 is not limited thereto. In some embodiments, Fig.15 and Fig.16 , Fig.15 This is a schematic diagram of the structure of the battery cell 20 in other embodiments provided in some embodiments of the present application. Fig.16 The structural exploded diagram of the battery cell 20 in other embodiments provided for some other embodiments of the present application. The battery cell 20 may also be provided with two wall portions 211, the two wall portions 211 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are respectively mounted on the two wall portions 211, so that the first electrode terminal 22 and the second electrode terminal 25 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, and correspondingly, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X.

[0271] The third connection portion 233 is located on one side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, that is, along the first direction X, the third connection portion 233 and the wall portion 211 are arranged on one side of the plurality of electrode assemblies 24. Fig.11 In the embodiment, the first current collecting member 23 is disposed inside the housing 21, and correspondingly, the first connection portion 232 of the first current collecting member 23 is disposed between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X. Of course, in the embodiment where the first current collecting member 23 is disposed outside the housing 21, the first connection portion 232 of the first current collecting member 23 is located on a side of the wall portion 211 away from the plurality of electrode assemblies 24 in the first direction X.

[0272] The fourth connection portion 263 is located on one side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, that is, along the first direction X, the fourth connection portion 263 and the wall portion 211 are arranged on one side of the plurality of electrode assemblies 24. Fig.11 In the embodiment, the second current collecting member 26 is disposed inside the housing 21, and correspondingly, the fourth connection portion 263 of the second current collecting member 26 is disposed between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X. Of course, in the embodiment where the second current collecting member 26 is disposed outside the housing 21, the fourth connection portion 263 of the second current collecting member 26 is located on a side of the wall portion 211 away from the plurality of electrode assemblies 24 in the first direction X.

[0273] It should be noted that the first connection part 232 and the third connection part 233 can be an integral structure, that is, the first connection part 232 and the third connection part 233 are integrally formed, and the first connection part 232 and the third connection part 233 can be made by an integral forming process such as stamping or casting. Of course, the first connection part 232 and the third connection part 233 can also be a split structure, that is, the first connection part 232 and the third connection part 233 are separately arranged, and the first connection part 232 and the third connection part 233 can be connected by welding or bolting. Similarly, the second connection part 262 and the fourth connection part 263 can be an integral structure, that is, the second connection part 262 and the fourth connection part 263 are integrally formed, and the second connection part 262 and the fourth connection part 263 can be made by an integral forming process such as stamping or casting. Of course, the second connection part 262 and the fourth connection part 263 can also be a split structure, that is, the second connection part 262 and the fourth connection part 263 are separately arranged, and the second connection part 262 and the fourth connection part 263 can be connected by welding or bolting.

[0274] The wall portion 211 of the shell 21 is located on at least one side of the plurality of electrode assemblies 24 in the first direction X, so that the wall portion 211 and the plurality of electrode assemblies 24 are arranged in the same direction, and the first current collecting member 23 has a third connection portion 233 located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the third connection portion 233 and the first connection portion 232 are connected to each other, and the third connection portion 233 is connected to the first electrode terminal 22 provided on the wall portion 211, and the first connection portion 232 is connected to the first pole ear 242 of the plurality of electrode assemblies 24, so that the first pole ear 242 is electrically connected to the first electrode terminal 22 through the first current collecting member 23. The battery cell 20 adopting this structure can realize, on the one hand, the separation of the area where the first electrode terminal 22 is provided on the shell 21 and the area where the first pole ear 242 is provided on the main body 241, so that the side of the main body 241 where the first pole ear 242 is provided faces The first electrode terminal 22 is not provided in the area of ​​the shell 21, so that the plurality of battery cells 20 can be stacked and placed along the second direction Y. On the other hand, the area where the first current collecting member 23 is connected to the first electrode terminal 22 and the area where the first current collecting member 23 is connected to the first pole tab 242 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 23, the first electrode terminal 22 and the first pole tab 242, and can reduce the interference between the first electrode terminal 22 and the first pole tab 242. In particular, when the first electrode terminal 22 and the first pole tab 242 are both welded to the first current collecting member 23, the mutual influence between the welding molten pool of the first electrode terminal 22 and the first current collecting member 23 and the welding molten pool of the first pole tab 242 and the first current collecting member 23 can be effectively reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 22 and the first pole tab 242 connected to the first current collecting member 23.Similarly, the second current collecting member 26 has a fourth connecting portion 263 located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X. The fourth connecting portion 263 is connected to the second electrode terminal 25 provided on the wall portion 211, and the second connecting portion 262 is connected to the second pole tabs 243 of the plurality of electrode assemblies 24, so that the second pole tabs 243 are electrically connected to the second electrode terminal 25 through the second current collecting member 26. The battery cell 20 with such a structure can, on the one hand, separate the area of ​​the outer shell 21 where the second electrode terminal 25 is provided and the area of ​​the main body 241 where the second pole tab 243 is provided, so that the area of ​​the outer shell 21 facing the side of the main body 241 where the second pole tab 243 is provided is not provided with the second electrode terminal 25, thereby facilitating the connection of the plurality of battery cells 20 along the second direction X. On the other hand, by stacking them in the Y direction, the area where the second current collecting member 26 is connected to the second electrode terminal 25 and the area where the second current collecting member 26 is connected to the second pole tab 243 can be separated from each other, which is beneficial to reducing the difficulty of assembling the second current collecting member 26 with the second electrode terminal 25 and the second pole tab 243, and can reduce the interference between the second electrode terminal 25 and the second pole tab 243, especially when the second electrode terminal 25 and the second pole tab 243 are both welded to the second current collecting member 26, it can effectively reduce the mutual influence between the welding molten pool of the second electrode terminal 25 and the second current collecting member 26 and the welding molten pool of the second pole tab 243 and the second current collecting member 26, which is beneficial to improving the assembly quality and stability of the second electrode terminal 25 and the second pole tab 243 connected to the second current collecting member 26.

[0275] In some embodiments, see Fig.11 , Fig.12 and Fig.13 As shown, along the first direction X, a first protrusion 234 is protruded from one side of the third connection portion 233 facing the wall portion 211 , and the first protrusion 234 is connected to the first electrode terminal 22 .

[0276] Exemplarily, the first current collecting member 23 is disposed inside the housing 21, and correspondingly, the first protrusion 234 is protruded on the side of the third connection portion 233 of the first current collecting member 23 away from the plurality of electrode assemblies 24. Of course, in the embodiment where the first current collecting member 23 is disposed outside the housing 21, the third connection portion 233 of the first current collecting member 23 is located on the side of the wall portion 211 away from the plurality of electrode assemblies 24, and the first protrusion 234 is protruded on the side of the third connection portion 233 of the first current collecting member 23 facing the plurality of electrode assemblies 24.

[0277] Illustratively, the third connection portion 233 of the first current collecting member 23 is welded to the first electrode terminal 22 through the first protrusion 234 .

[0278] The third connection portion 233 of the first current collecting member 23 is provided with a first protrusion 234 on one side facing the wall portion 211 in the first direction X, and the first protrusion 234 is interconnected with the first electrode terminal 22 to achieve electrical connection between the first current collecting member 23 and the first electrode terminal 22. The first current collecting member 23 adopting such a structure can reduce the difficulty of assembling the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22, and the structure in which the first protrusion 234 is interconnected with the first electrode terminal 22 can improve the connection reliability between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22.

[0279] In some embodiments, see Fig.11 , Fig.12 and Fig.14 As shown, along the first direction X, a second protrusion 264 is protruded from one side of the fourth connection portion 263 facing the wall portion 211 , and the second protrusion 264 is connected to the second electrode terminal 25 .

[0280] Exemplarily, the second current collecting member 26 is disposed inside the housing 21, and correspondingly, the second protrusion 264 is protruded from the side of the fourth connection portion 263 of the second current collecting member 26 away from the plurality of electrode assemblies 24. Of course, in the embodiment where the second current collecting member 26 is disposed outside the housing 21, the fourth connection portion 263 of the second current collecting member 26 is located on the side of the wall portion 211 away from the plurality of electrode assemblies 24, and the second protrusion 264 is protruded from the side of the fourth connection portion 263 of the second current collecting member 26 facing the plurality of electrode assemblies 24.

[0281] Illustratively, the fourth connection portion 263 of the second current collecting member 26 is welded to the second electrode terminal 25 through the second protrusion 264 .

[0282] The fourth connection portion 263 of the second current collecting member 26 is provided with a second protrusion 264 on one side facing the wall portion 211 in the first direction X, and the second protrusion 264 is interconnected with the second electrode terminal 25 to achieve electrical connection between the second current collecting member 26 and the second electrode terminal 25. The second current collecting member 26 adopting this structure can reduce the difficulty of assembling the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25, and the structure in which the second protrusion 264 and the second electrode terminal 25 are interconnected can improve the connection reliability between the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25.

[0283] According to some embodiments of the present application, see Fig.10 and Fig.11As shown, along the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both arranged on the same side of the plurality of electrode assemblies 24 , and the third connection portion 233 and the fourth connection portion 263 are both located on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22 and the second electrode terminal 25 .

[0284] Among them, along the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both arranged on the same side of the multiple electrode assemblies 24, that is, the outer shell 21 only includes one wall portion 211, and the wall portion 211 is located on one side of the multiple electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are both installed on the same wall portion 211.

[0285] For example, in Fig.10 and Fig.11 In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21, and correspondingly, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X. Of course, in the embodiment where the first current collecting member 23 and the second current collecting member 26 are both disposed outside the housing 21, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the side of the wall portion 211 away from the plurality of electrode assemblies 24 in the first direction X.

[0286] By arranging the first electrode terminal 22 and the second electrode terminal 25 on the same side of the plurality of electrode assemblies 24 in the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both installed on one wall portion 211, and the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22 and the second electrode terminal 25. On the one hand, it is convenient to connect the third connection portion 233 of the first current collecting member 23 with the first electrode terminal 22, and to connect the fourth connection portion 263 of the second current collecting member 26 with the second electrode terminal 25. On the other hand, the battery cell 20 is a structure in which the first electrode terminal 22 and the second electrode terminal 25 are output at the same end in the first direction X, and the third connection portion 233 and the fourth connection portion 263 can share a space in the first direction X, thereby improving the space utilization of the battery cell 20 and improving the energy density of the battery cell 20.

[0287] According to some embodiments of the present application, see Fig.11As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a third insulating member 29, which is arranged between the third connection part 233 and the fourth connection part 263 and the plurality of electrode assemblies 24 along the first direction X to insulate and isolate the third connection part 233 and the electrode assembly 24 and the fourth connection part 263 and the electrode assembly 24.

[0288] In which, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the same side of the multiple electrode assemblies 24 facing the wall portion 211 in the first direction X, so that the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located between the third insulating member 29 and the wall portion 211 in the first direction X, so that the third insulating member 29 is located between the third connection portion 233 and the multiple electrode assemblies 24 and the fourth connection portion 263 and the multiple electrode assemblies 24.

[0289] Exemplarily, the third insulating member 29 may be made of various materials, such as rubber, plastic or silicone.

[0290] The battery cell 20 is also provided with a third insulating member 29, and the third insulating member 29 is arranged on the side of the third connecting portion 233 and the fourth connecting portion 263 facing the multiple electrode assemblies 24, so that the third insulating member 29 is located between the third connecting portion and the fourth connecting portion 263 and the multiple electrode assemblies 24. The battery cell 20 adopting this structure can, on the one hand, realize the insulation isolation between the third connecting portion 233 and the electrode assembly 24 and between the fourth connecting portion 263 and the electrode assembly 24, which is beneficial to reduce the risk of short circuit. On the other hand, it can realize that the third connecting portion 233 of the first current collecting component 23 and the fourth connecting portion 263 of the second current collecting component 26 share a third insulating member 29, which is beneficial to optimize the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0291] In some embodiments, see Fig.11 As shown, along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0292] The first clamping groove 31 is disposed on a side of the third insulating member 29 facing the wall portion 211 in the first direction X, so that the third connecting portion 233 of the first current collecting member 23 can be clamped in the first clamping groove 31 .

[0293] Exemplarily, the thickness of the third connection portion 233 in the first direction X is less than or equal to the depth of the first slot 31 in the first direction X, so that the third connection portion 233 does not extend out of the first slot 31 in the first direction X.

[0294] By providing a first card slot 31 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the third connecting portion 233 of the first current collecting member 23 can be accommodated in the first card slot 31, thereby improving the structural stability of the third insulating assembly between the third connecting portion 233 and the plurality of electrode assemblies 24, and the third insulating member 29 and the third connecting portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0295] In some embodiments, see Fig.11 As shown, along the first direction X, a second slot 32 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0296] The second clamping groove 32 is disposed on a side of the third insulating member 29 facing the wall portion 211 in the first direction X, so that the fourth connection portion 263 of the second current collecting member 26 can be clamped in the second clamping groove 32 .

[0297] Exemplarily, the thickness of the fourth connection portion 263 in the first direction X is less than or equal to the depth of the second slot 32 in the first direction X, so that the fourth connection portion 263 does not extend out of the second slot 32 in the first direction X.

[0298] It should be noted that in the embodiment where the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the same side of the plurality of electrode assemblies 24 in the first direction X, the first card slot 31 and the second card slot 32 are both located on the same side of the third insulating member 29 in the first direction X.

[0299] By providing a second slot 32 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the fourth connecting portion 263 of the second current collecting member 26 can be accommodated in the second slot 32, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion 263 and the plurality of electrode assemblies 24, and the third insulating member 29 and the fourth connecting portion 263 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0300] According to some embodiments of the present application, see Fig.15 and Fig.16As shown, along the first direction X, the housing 21 has two wall portions 211 arranged opposite to each other, the two wall portions 211 are respectively located on both sides of the plurality of electrode assemblies 24, and the first electrode terminal 22 and the second electrode terminal 25 are respectively arranged on the two wall portions 211. The third connection portion 233 is located on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22, and the fourth connection portion 263 is located on the side of the plurality of electrode assemblies 24 facing the second electrode terminal 25.

[0301] Among them, along the first direction X, the outer shell 21 has two wall portions 211 arranged opposite to each other, and the two wall portions 211 are respectively located on both sides of the multiple electrode assemblies 24, that is, the walls of the outer shell 21 located on both sides of the multiple electrode assemblies 24 in the first direction X are both wall portions 211, and the first electrode terminal 22 and the second electrode terminal 25 are respectively installed on the two wall portions 211, so that the first electrode terminal 22 and the second electrode terminal 25 are respectively located on both sides of the multiple electrode assemblies 24 in the first direction X, and the third connection portion 233 of the first current collecting component 23 and the fourth connection portion 263 of the second current collecting component 26 are respectively located on both sides of the multiple electrode assemblies 24 in the first direction X.

[0302] For example, in Fig.15 and Fig.16 In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both arranged inside the outer shell 21, and correspondingly, the third connection portion 233 of the first current collecting member 23 is located between the wall portion 211 on which the first electrode terminal 22 is provided and the plurality of electrode assemblies 24 in the first direction X, and the fourth connection portion 263 of the second current collecting member 26 is located between the wall portion 211 on which the second electrode terminal 25 is provided and the plurality of electrode assemblies 24 in the first direction X. Of course, in the embodiment where the first current collecting member 23 and the second current collecting member 26 are both arranged outside the outer shell 21, the third connection portion 233 of the first current collecting member 23 is located on the side of the wall portion 211 where the first electrode terminal 22 is provided, which is away from the multiple electrode assemblies 24 in the first direction X, and the fourth connection portion 263 of the second current collecting member 26 is located on the side of the wall portion 211 where the second electrode terminal 25 is provided, which is away from the multiple electrode assemblies 24 in the first direction X. That is to say, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are respectively located on both sides of the outer shell 21 in the first direction X.

[0303] By respectively arranging the first electrode terminal 22 and the second electrode terminal 25 on the two wall portions 211 located on both sides of the plurality of electrode assemblies 24 in the first direction X, and respectively arranging the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 on both sides of the plurality of electrode assemblies 24, it is convenient on the one hand to connect the third connection portion 233 of the first current collecting member 23 with the first electrode terminal 22, and to connect the fourth connection portion 263 of the second current collecting member 26 with the second electrode terminal 25, and on the other hand to achieve the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 to be away from each other, which is conducive to alleviating the interference phenomenon between the third connection portion 233 and the fourth connection portion 263, and can reduce the risk of short circuit between the third connection portion 233 and the fourth connection portion 263, so as to improve the reliability of the battery cell 20.

[0304] According to some embodiments of the present application, see Fig.16 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a third insulating member 29 and a fourth insulating member 30, and the third insulating member 29 and the fourth insulating member 30 are respectively arranged on both sides of the multiple electrode assemblies 24 along the first direction X, and the third insulating member 29 is located between the third connecting portion 233 and the multiple electrode assemblies 24 to insulate and isolate the third connecting portion 233 and the electrode assembly 24, and the fourth insulating member 30 is located between the fourth connecting portion 263 and the multiple electrode assemblies 24 to insulate and isolate the fourth connecting portion 263 and the electrode assembly 24.

[0305] Among them, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, so that the third connection portion 233 of the first current collecting member 23 is located between the third insulating member 29 and the wall portion 211 provided with the first electrode terminal 22 in the first direction X, so that the third insulating member 29 is located between the third connection portion 233 and the plurality of electrode assemblies 24. Similarly, the fourth connection portion 263 of the second current collecting member 26 is located between the fourth insulating member 30 and the wall portion 211 provided with the second electrode terminal 25 in the first direction X, so that the fourth insulating member 30 is located between the fourth connection portion 263 and the plurality of electrode assemblies 24.

[0306] Exemplarily, the third insulating member 29 may be made of various materials, such as rubber, plastic, or silicone, etc. Similarly, the fourth insulating member 30 may be made of various materials, such as rubber, plastic, or silicone, etc.

[0307] The battery cell 20 is also provided with a third insulating member 29 and a fourth insulating member 30, and the third insulating member 29 and the fourth insulating member 30 are respectively arranged on both sides of the multiple electrode assemblies 24 in the first direction X, so that the third insulating member 29 is located between the third connecting portion 233 and the multiple electrode assemblies 24, and the fourth insulating member 30 is located between the fourth connecting portion 263 and the multiple electrode assemblies 24, thereby achieving insulation isolation between the third connecting portion 233 and the electrode assembly 24 and between the fourth connecting portion 263 and the electrode assembly 24, which is beneficial to reduce the short circuit risk of the battery cell 20 and improve the reliability of the battery cell 20.

[0308] In some embodiments, see Fig.16 As shown, along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0309] The first slot 31 is disposed on one side of the third insulating member 29 in the first direction X facing the wall portion 211 where the first electrode terminal 22 is disposed, so that the third connection portion 233 of the first current collecting member 23 can be locked in the first slot 31 .

[0310] Exemplarily, the thickness of the third connection portion 233 in the first direction X is less than or equal to the depth of the first slot 31 in the first direction X, so that the third connection portion 233 does not extend out of the first slot 31 in the first direction X.

[0311] By providing a first card slot 31 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the third connecting portion 233 of the first current collecting member 23 can be accommodated in the first card slot 31, thereby improving the structural stability of the third insulating assembly between the third connecting portion 233 and the plurality of electrode assemblies 24, and the third insulating member 29 and the third connecting portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0312] In some embodiments, see Fig.16 As shown, along the first direction X, a second slot 32 is provided on a side of the fourth insulating member 30 away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0313] The second slot 32 is disposed on one side of the fourth insulating member 30 facing the wall portion 211 where the second electrode terminal 25 is disposed in the first direction X, so that the fourth connection portion 263 of the second current collecting member 26 can be locked in the second slot 32 .

[0314] Exemplarily, the thickness of the fourth connection portion 263 in the first direction X is less than or equal to the depth of the second slot 32 in the first direction X, so that the fourth connection portion 263 does not extend out of the second slot 32 in the first direction X.

[0315] By providing a second card slot 32 on the side of the fourth insulating member 30 away from the electrode assembly 24 along the first direction X, the fourth connecting portion 263 of the second current collecting member 26 can be accommodated in the second card slot 32, thereby improving the structural stability of the fourth insulating assembly between the fourth connecting portion 263 and the plurality of electrode assemblies 24, and the fourth insulating member 30 and the fourth connecting portion 263 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0316] According to some embodiments of the present application, referring to Fig.17 , Fig.18 , Fig.19 , Fig. 20 and Fig.21 , Fig.17 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. Fig.18 The structure explosion diagram of the battery cell 20 provided in some embodiments of the present application is as follows: Fig.19 Schematic diagram of assembling the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 provided in some other embodiments of the present application, Fig. 20 This is a schematic structural diagram of a first current collecting member 23 of a battery cell 20 provided in some further embodiments of the present application. Fig.21 A schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided in some other embodiments of the present application. Along the second direction Y, the first pole tab 242 and the second pole tab 243 are respectively arranged at both ends of the main body 241. The first current collecting member 23 includes a first connecting portion 232 electrically connecting each first pole tab 242, and the first connecting portion 232 is located on the side of the main body 241 where the first pole tab 242 is arranged in the second direction Y. The second current collecting member 26 includes a second connecting portion 262 electrically connecting each second pole tab 243, and the second connecting portion 262 is located on the side of the main body 241 where the second pole tab 243 is arranged in the second direction Y.

[0317] The first current collecting member 23 includes a first connection portion 232, which is a portion of the first current collecting member 23 located on one side of the main body 241 provided with the first pole tab 242 in the second direction Y, and the first connection portion 232 plays a role in connecting the first pole tabs 242 of the plurality of electrode assemblies 24. Similarly, the second current collecting member 26 includes a second connection portion 262, which is a portion of the second current collecting member 26 located on one side of the main body 241 provided with the second pole tab 243 in the second direction Y, and the second connection portion 262 plays a role in connecting the second pole tabs 243 of the plurality of electrode assemblies 24. Since the first pole tab 242 and the second pole tab 243 are respectively disposed at both ends of the main body 241 in the second direction Y, the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 are respectively located at both ends of the main body 241 in the second direction Y.

[0318] For example, in Fig.18 In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both arranged inside the outer shell 21, so that the first connection portion 232 of the first current collecting member 23 is located between the side of the main body 241 provided with the first pole ear 242 and the outer shell 21 in the second direction Y, and the second connection portion 262 of the second current collecting member 26 is located between the side of the main body 241 provided with the second pole ear 243 and the outer shell 21 in the second direction Y, so that the main body 241 is located between the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 in the second direction Y.

[0319] It should be noted that in the embodiment where the first pole tab 242 and the second pole tab 243 are respectively disposed at both ends of the main body 241 in the second direction Y, the structure of the battery cell 20 may be various. Fig.17 and Fig.18 In the embodiment, the wall portion 211 may be located on one side of the plurality of electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are both mounted on the same wall portion 211. Of course, the battery cell 20 may also have other structures, see Fig. 22 , Fig. 22The structural exploded diagram of the battery cell 20 in other embodiments provided in some other embodiments of the present application, the battery cell 20 may also include two wall portions 211, the two wall portions 211 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are respectively installed on the two wall portions 211. In other embodiments, the battery cell 20 may also be two wall portions 211 located on both sides of the plurality of electrode assemblies 24 in the second direction Y, and the first electrode terminal 22 is installed on the wall portion 211 of the two wall portions 211 facing the first pole tab 242 in the second direction Y, and the second electrode terminal 25 is installed on the wall portion 211 of the two wall portions 211 facing the second pole tab 243 in the second direction Y. In this embodiment, the first current collecting member 23 may be located as a whole on the side of the main body 241 provided with the first pole tab 242 in the second direction Y, and the second current collecting member 26 may be located as a whole on the side of the main body 241 provided with the second pole tab 243 in the second direction Y.

[0320] By respectively arranging the first pole tab 242 and the second pole tab 243 at the two ends of the main body 241 in the second direction Y, and respectively arranging the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 at the two sides of the plurality of electrode assemblies 24 in the second direction Y, on the one hand, it is convenient for the first current collecting member 23 and the second current collecting member 26 to be connected to the first pole tab 242 and the second pole tab 243 respectively, which is conducive to alleviating the mutual interference between the first current collecting member 23 and the second current collecting member 26; on the other hand, the first pole tab 242 and the second pole tab 243 with opposite polarities can be kept away from each other, and the first connection portion 232 of the first current collecting member 23 and the second connection portion 262 of the second current collecting member 26 can be kept away from each other, which is conducive to reducing the risk of short circuit between the first pole tab 242 and the second pole tab 243 and between the first current collecting member 23 and the second current collecting member 26, so as to improve the reliability of the battery cell 20.

[0321] According to some embodiments of the present application, see Fig.18 and Fig. 22 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include two first insulating members 27, and the two first insulating members 27 are respectively arranged on both sides of the multiple electrode assemblies 24 along the second direction Y, one first insulating member 27 is located on the side of the first connection part 232 away from the main body 241 to insulate and isolate the first connection part 232 and the outer shell 21, and the other first insulating member 27 is located on the side of the second connection part 262 away from the main body 241 to insulate and isolate the second connection part 262 and the outer shell 21.

[0322] Among them, one first insulating member 27 is located on the side of the first connecting portion 232 away from the main body 241, and the other first insulating member 27 is located on the side of the second connecting portion 262 away from the main body 241, that is, the two first insulating members 27 are arranged at intervals along the second direction Y, and the first connecting portion 232 of the first current collecting component 23, the main body 241 and the second connecting portion 262 of the second current collecting component 26 are arranged in sequence along the second direction Y between the two first insulating members 27.

[0323] Exemplarily, the first insulating member 27 may be made of various materials, such as silicone, rubber or plastic.

[0324] The battery cell 20 is also provided with two first insulating members 27, and the two first insulating members 27 are respectively arranged on the side of the first connecting portion 232 of the first current collecting member 23 away from the electrode assembly 24 and the side of the second connecting portion 262 of the second current collecting member 26 away from the electrode assembly 24, so that the first insulating member 27 is provided between the first connecting portion 232 and the outer shell 21 and between the second connecting portion 262 and the outer shell 21, so that the two first insulating members 27 can respectively achieve insulation isolation between the first connecting portion 232 and the outer shell 21 and between the second connecting portion 262 and the outer shell 21, which is beneficial to reduce the risk of short circuit between the first current collecting member 23, the second current collecting member 26 and the outer shell 21, so as to improve the reliability of the battery cell 20.

[0325] According to some embodiments of this application, please continue to refer to Fig.18 and Fig. 22 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 also includes two second insulating members 28, which are respectively arranged on both sides of the multiple electrode assemblies 24 along the second direction Y. One second insulating member 28 is located between the first connecting portion 232 and the main body 241 to insulate and isolate the first connecting portion 232 and the main body 241, and the other second insulating member 28 is located between the second connecting portion 262 and the main body 241 to insulate and isolate the second connecting portion 262 and the main body 241.

[0326] Among them, one second insulating member 28 is located between the first connecting portion 232 and the main body 241, and the other second insulating member 28 is located between the second connecting portion 262 and the main body 241, that is, the two second insulating members 28 are respectively arranged on both sides of the main body 241 in the second direction Y, and the first connecting portion 232 of the first current collecting component 23 and the second connecting portion 262 of the second current collecting component 26 are respectively arranged on both sides of the two second insulating members 28 along the second direction Y.

[0327] Exemplarily, the second insulating member 28 may be made of various materials, such as plastic, silicone, or rubber.

[0328] The battery cell 20 is also provided with two second insulating members 28, and the two second insulating members 28 are respectively arranged on the side of the first connecting portion 232 facing the main body 241 and the side of the second connecting portion 262 facing the main body 241, so that the second insulating member 28 is arranged between the first connecting portion 232 and the main body 241 and between the second connecting portion 262 and the main body 241, so that the two first insulating members 27 can respectively achieve insulation isolation between the first connecting portion 232 and the main body 241 and between the second connecting portion 262 and the main body 241, which is beneficial to reduce the risk of short circuit between the first current collecting component 23 and the second current collecting component 26 and the main body 241, so as to improve the reliability of the battery cell 20.

[0329] According to some embodiments of the present application, see Fig.17 , Fig.18 , Fig.19 , Fig. 20 and Fig.21 As shown, along the first direction X, the wall portion 211 is located on at least one side of the plurality of electrode assemblies 24. The first current collecting member 23 further includes a third connection portion 233 connected to the first connection portion 232, the third connection portion 233 is located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the third connection portion 233 is connected to the first electrode terminal 22. The second current collecting member 26 further includes a fourth connection portion 263 connected to the second connection portion 262, the fourth connection portion 263 is located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the fourth connection portion 263 is connected to the second electrode terminal 25.

[0330] Among them, along the first direction X, the wall portion 211 is located on at least one side of the multiple electrode assemblies 24, that is, the wall of the outer shell 21 located on one side of the multiple electrode assemblies 24 in the first direction X is the wall portion 211, so that the first electrode terminal 22 is located on one side of the multiple electrode assemblies 24 in the first direction X, and the second electrode terminal 25 is located on one side of the multiple electrode assemblies 24 in the first direction X.

[0331] For example, in Fig.18 and Fig.19 In the embodiment, the battery cell 20 is provided with only one wall portion 211, and the first electrode terminal 22 and the second electrode terminal 25 are both installed on the one wall portion 211, so that the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located on the side of the multiple electrode assemblies 24 facing the wall portion 211 in the first direction X.

[0332] Of course, the structure of the battery cell 20 is not limited thereto. In some embodiments, see Fig. 22As shown, the battery cell 20 may also be provided with two wall portions 211, and the two wall portions 211 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are respectively installed on the two wall portions 211, so that the first electrode terminal 22 and the second electrode terminal 25 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X, and correspondingly, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are respectively located on both sides of the plurality of electrode assemblies 24 in the first direction X.

[0333] Exemplarily, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are disposed on the same side of the plurality of electrode assemblies 24 in the first direction X and are located between the wall portion 211 and the plurality of electrode assemblies 24 .

[0334] The wall portion 211 of the shell 21 is located on at least one side of the plurality of electrode assemblies 24 in the first direction X, so that the wall portion 211 and the plurality of electrode assemblies 24 are arranged in the same direction, and the first current collecting member 23 has a third connection portion 233 located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X, and the third connection portion 233 and the first connection portion 232 are connected to each other, and the third connection portion 233 is connected to the first electrode terminal 22 provided on the wall portion 211, and the first connection portion 232 is connected to the first pole ear 242 of the plurality of electrode assemblies 24, so that the first pole ear 242 is electrically connected to the first electrode terminal 22 through the first current collecting member 23. The battery cell 20 adopting this structure can realize, on the one hand, the separation of the area where the first electrode terminal 22 is provided on the shell 21 and the area where the first pole ear 242 is provided on the main body 241, so that the side of the main body 241 where the first pole ear 242 is provided faces The first electrode terminal 22 is not provided in the area of ​​the shell 21, so that the plurality of battery cells 20 can be stacked and placed along the second direction Y. On the other hand, the area where the first current collecting member 23 is connected to the first electrode terminal 22 and the area where the first current collecting member 23 is connected to the first pole tab 242 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 23, the first electrode terminal 22 and the first pole tab 242, and can reduce the interference between the first electrode terminal 22 and the first pole tab 242. In particular, when the first electrode terminal 22 and the first pole tab 242 are both welded to the first current collecting member 23, the mutual influence between the welding molten pool of the first electrode terminal 22 and the first current collecting member 23 and the welding molten pool of the first pole tab 242 and the first current collecting member 23 can be effectively reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 22 and the first pole tab 242 connected to the first current collecting member 23.Similarly, the second current collecting member 26 has a fourth connecting portion 263 located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X. The fourth connecting portion 263 is connected to the second electrode terminal 25 provided on the wall portion 211, and the second connecting portion 262 is connected to the second pole tabs 243 of the plurality of electrode assemblies 24, so that the second pole tabs 243 are electrically connected to the second electrode terminal 25 through the second current collecting member 26. The battery cell 20 with such a structure can, on the one hand, separate the area of ​​the outer shell 21 where the second electrode terminal 25 is provided and the area of ​​the main body 241 where the second pole tab 243 is provided, so that the area of ​​the outer shell 21 facing the side of the main body 241 where the second pole tab 243 is provided is not provided with the second electrode terminal 25, thereby facilitating the connection of the plurality of battery cells 20 along the second direction X. On the other hand, by stacking them in the Y direction, the area where the second current collecting member 26 is connected to the second electrode terminal 25 and the area where the second current collecting member 26 is connected to the second pole tab 243 can be separated from each other, which is beneficial to reducing the difficulty of assembling the second current collecting member 26 with the second electrode terminal 25 and the second pole tab 243, and can reduce the interference between the second electrode terminal 25 and the second pole tab 243, especially when the second electrode terminal 25 and the second pole tab 243 are both welded to the second current collecting member 26, it can effectively reduce the mutual influence between the welding molten pool of the second electrode terminal 25 and the second current collecting member 26 and the welding molten pool of the second pole tab 243 and the second current collecting member 26, which is beneficial to improving the assembly quality and stability of the second electrode terminal 25 and the second pole tab 243 connected to the second current collecting member 26.

[0335] In some embodiments, see Fig.18 , Fig.19 and Fig. 20 As shown, along the first direction X, a first protrusion 234 is protruded from one side of the third connection portion 233 facing the wall portion 211 , and the first protrusion 234 is connected to the first electrode terminal 22 .

[0336] Exemplarily, the first current collecting member 23 is disposed inside the outer shell 21, the first protrusion 234 is protruded from the side of the third connection portion 233 of the first current collecting member 23 away from the plurality of electrode assemblies 24, and the third connection portion 233 of the first current collecting member 23 is welded to the first electrode terminal 22 through the first protrusion 234.

[0337] The third connection portion 233 of the first current collecting member 23 is provided with a first protrusion 234 on one side facing the wall portion 211 in the first direction X, and the first protrusion 234 is interconnected with the first electrode terminal 22 to achieve electrical connection between the first current collecting member 23 and the first electrode terminal 22. The first current collecting member 23 adopting such a structure can reduce the difficulty of assembling the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22, and the structure in which the first protrusion 234 is interconnected with the first electrode terminal 22 can improve the connection reliability between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22.

[0338] In some embodiments, see Fig.18 , Fig.19 and Fig.21 As shown, along the first direction X, a second protrusion 264 is protruded from one side of the fourth connection portion 263 facing the wall portion 211 , and the second protrusion 264 is connected to the second electrode terminal 25 .

[0339] Exemplarily, the second current collecting member 26 is disposed inside the outer shell 21, the second protrusion 264 is protruded from the side of the fourth connection portion 263 of the second current collecting member 26 away from the plurality of electrode assemblies 24, and the fourth connection portion 263 of the second current collecting member 26 is welded to the second electrode terminal 25 through the second protrusion 264.

[0340] The fourth connection portion 263 of the second current collecting member 26 is provided with a second protrusion 264 on one side facing the wall portion 211 in the first direction X, and the second protrusion 264 is interconnected with the second electrode terminal 25 to achieve electrical connection between the second current collecting member 26 and the second electrode terminal 25. The second current collecting member 26 adopting this structure can reduce the difficulty of assembling the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25, and the structure in which the second protrusion 264 and the second electrode terminal 25 are interconnected can improve the connection reliability between the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25.

[0341] According to some embodiments of the present application, see Fig.17 , Fig.18 and Fig.19 As shown, along the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both arranged on the same side of the plurality of electrode assemblies 24 , and the third connection portion 233 and the fourth connection portion 263 are both located on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22 and the second electrode terminal 25 .

[0342] Among them, along the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both arranged on the same side of the multiple electrode assemblies 24, that is, the outer shell 21 only includes one wall portion 211, and the wall portion 211 is located on one side of the multiple electrode assemblies 24 in the first direction X, and the first electrode terminal 22 and the second electrode terminal 25 are both installed on the same wall portion 211.

[0343] For example, in Fig.18 In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21 , and correspondingly, the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X.

[0344] By arranging the first electrode terminal 22 and the second electrode terminal 25 on the same side of the plurality of electrode assemblies 24 in the first direction X, the first electrode terminal 22 and the second electrode terminal 25 are both installed on one wall portion 211, and the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both arranged on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22 and the second electrode terminal 25. On the one hand, it is convenient to connect the third connection portion 233 of the first current collecting member 23 with the first electrode terminal 22, and to connect the fourth connection portion 263 of the second current collecting member 26 with the second electrode terminal 25. On the other hand, the battery cell 20 is a structure in which the first electrode terminal 22 and the second electrode terminal 25 are output at the same end in the first direction X, and the third connection portion 233 and the fourth connection portion 263 can share a space in the first direction X, thereby improving the space utilization of the battery cell 20 and improving the energy density of the battery cell 20.

[0345] According to some embodiments of the present application, see Fig.18 As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a third insulating member 29, which is arranged between the third connection part 233 and the fourth connection part 263 and the plurality of electrode assemblies 24 along the first direction X to insulate and isolate the third connection part 233 and the electrode assembly 24 and the fourth connection part 263 and the electrode assembly 24.

[0346] The third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are both located in the first direction X at a side of the third insulating member 29 away from the plurality of electrode assemblies 24 .

[0347] Exemplarily, the third insulating member 29 can be made of various materials, such as plastic, rubber or silicone.

[0348] The battery cell 20 is also provided with a third insulating member 29, and the third insulating member 29 is arranged on the side of the third connecting portion 233 and the fourth connecting portion 263 facing the multiple electrode assemblies 24, so that the third insulating member 29 is located between the third connecting portion and the fourth connecting portion 263 and the multiple electrode assemblies 24. The battery cell 20 adopting this structure can, on the one hand, realize the insulation isolation between the third connecting portion 233 and the electrode assembly 24 and between the fourth connecting portion 263 and the electrode assembly 24, which is beneficial to reduce the risk of short circuit. On the other hand, it can realize that the third connecting portion 233 of the first current collecting component 23 and the fourth connecting portion 263 of the second current collecting component 26 share a third insulating member 29, which is beneficial to optimize the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0349] In some embodiments, see Fig.18 As shown, along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0350] By providing a first card slot 31 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the third connecting portion 233 of the first current collecting member 23 can be accommodated in the first card slot 31, thereby improving the structural stability of the third insulating assembly between the third connecting portion 233 and the plurality of electrode assemblies 24, and the third insulating member 29 and the third connecting portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0351] In some embodiments, see Fig.18 As shown, along the first direction X, a second slot 32 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0352] By providing a second slot 32 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the fourth connecting portion 263 of the second current collecting member 26 can be accommodated in the second slot 32, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion 263 and the plurality of electrode assemblies 24, and the third insulating member 29 and the fourth connecting portion 263 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0353] According to some embodiments of the present application, see Fig. 22As shown, along the first direction X, the housing 21 has two wall portions 211 arranged opposite to each other, the two wall portions 211 are respectively located on both sides of the plurality of electrode assemblies 24, and the first electrode terminal 22 and the second electrode terminal 25 are respectively arranged on the two wall portions 211. The third connection portion 233 is located on the side of the plurality of electrode assemblies 24 facing the first electrode terminal 22, and the fourth connection portion 263 is located on the side of the plurality of electrode assemblies 24 facing the second electrode terminal 25.

[0354] Among them, along the first direction X, the outer shell 21 has two wall portions 211 arranged opposite to each other, and the two wall portions 211 are respectively located on both sides of the multiple electrode assemblies 24, that is, the walls of the outer shell 21 located on both sides of the multiple electrode assemblies 24 in the first direction X are both wall portions 211, and the first electrode terminal 22 and the second electrode terminal 25 are respectively installed on the two wall portions 211, so that the first electrode terminal 22 and the second electrode terminal 25 are respectively located on both sides of the multiple electrode assemblies 24 in the first direction X.

[0355] For example, in Fig. 22 In the embodiment, the first current collecting member 23 and the second current collecting member 26 are both arranged inside the outer shell 21, and correspondingly, the third connection portion 233 of the first current collecting member 23 is located between the multiple electrode assemblies 24 and the wall portion 211 on which the first electrode terminal 22 is provided in the first direction X, and the fourth connection portion 263 of the second current collecting member 26 is located between the multiple electrode assemblies 24 and the wall portion 211 on which the second electrode terminal 25 is provided in the first direction X.

[0356] By respectively arranging the first electrode terminal 22 and the second electrode terminal 25 on the two wall portions 211 located on both sides of the plurality of electrode assemblies 24 in the first direction X, and the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 are respectively located on both sides of the plurality of electrode assemblies 24, on the one hand, it is convenient to connect the third connection portion 233 of the first current collecting member 23 with the first electrode terminal 22, and to connect the fourth connection portion 263 of the second current collecting member 26 with the second electrode terminal 25, and on the other hand, it is possible to keep the third connection portion 233 of the first current collecting member 23 and the fourth connection portion 263 of the second current collecting member 26 away from each other, which is beneficial to reduce the risk of short circuit between the third connection portion 233 and the fourth connection portion 263, so as to improve the reliability of the battery cell 20.

[0357] According to some embodiments of the present application, see Fig. 22As shown, the first current collecting member 23 and the second current collecting member 26 are both arranged in the outer shell 21, and the battery cell 20 may also include a third insulating member 29 and a fourth insulating member 30, and the third insulating member 29 and the fourth insulating member 30 are respectively arranged on both sides of the multiple electrode assemblies 24 along the first direction X, and the third insulating member 29 is located between the third connecting portion 233 and the multiple electrode assemblies 24 to insulate and isolate the third connecting portion 233 and the electrode assembly 24, and the fourth insulating member 30 is located between the fourth connecting portion 263 and the multiple electrode assemblies 24 to insulate and isolate the fourth connecting portion 263 and the electrode assembly 24.

[0358] The third connection portion 233 of the first current collecting member 23 is located on the side of the third insulating member 29 away from the plurality of electrode assemblies 24 in the first direction X, so that the third connection portion 233 and the electrode assembly 24 are insulated and isolated by the third insulating member 29. Similarly, the fourth connection portion 263 of the second current collecting member 26 is located on the side of the fourth insulating member 30 away from the plurality of electrode assemblies 24 in the first direction X, so that the fourth connection portion 263 and the electrode assembly 24 are insulated and isolated by the fourth insulating member 30.

[0359] Exemplarily, the third insulating member 29 may be made of various materials, such as silicone, rubber or plastic, etc. Similarly, the fourth insulating member 30 may be made of various materials, such as silicone, rubber or plastic, etc.

[0360] The battery cell 20 is also provided with a third insulating member 29 and a fourth insulating member 30, and the third insulating member 29 and the fourth insulating member 30 are respectively arranged on both sides of the multiple electrode assemblies 24 in the first direction X, so that the third insulating member 29 is located between the third connecting portion 233 and the multiple electrode assemblies 24, and the fourth insulating member 30 is located between the fourth connecting portion 263 and the multiple electrode assemblies 24, thereby achieving insulation isolation between the third connecting portion 233 and the electrode assembly 24 and between the fourth connecting portion 263 and the electrode assembly 24, which is beneficial to reduce the short circuit risk of the battery cell 20 and improve the reliability of the battery cell 20.

[0361] In some embodiments, see Fig. 22 As shown, along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0362] By providing a first card slot 31 on the side of the third insulating member 29 away from the electrode assembly 24 along the first direction X, the third connecting portion 233 of the first current collecting member 23 can be accommodated in the first card slot 31, thereby improving the structural stability of the third insulating assembly between the third connecting portion 233 and the plurality of electrode assemblies 24, and the third insulating member 29 and the third connecting portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0363] In some embodiments, please see Fig. 22 As shown, along the first direction X, a second slot 32 is provided on a side of the fourth insulating member 30 away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0364] By providing a second card slot 32 on the side of the fourth insulating member 30 away from the electrode assembly 24 along the first direction X, the fourth connecting portion 263 of the second current collecting member 26 can be accommodated in the second card slot 32, thereby improving the structural stability of the fourth insulating assembly between the fourth connecting portion 263 and the plurality of electrode assemblies 24, and the fourth insulating member 30 and the fourth connecting portion 263 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0365] It should be noted that in the embodiment where the first electrode tab 242 and the second electrode tab 243 are respectively disposed at both ends of the main body 241 along the second direction Y, the main body 241 of the electrode assembly 24 may have a variety of shapes, for example, see Fig.18 and Fig. 22 As shown, the main body 241 of the electrode assembly 24 is a rectangular parallelepiped structure, and the first pole tab 242 and the second pole tab 243 are respectively connected to the two ends of the main body 241 in the second direction Y. Of course, the structure of the battery cell 20 is not limited to this. Fig.23 , Fig.23 In some other embodiments of the present application, the first current collecting member 23 of the battery cell 20 and the electrode assembly 24 are provided as schematic diagrams of assembly, wherein the main body 241 of the electrode assembly 24 is cylindrical, and the first pole tab 242 and the second pole tab 243 are respectively connected to the two ends of the main body 241 in the second direction Y. Fig.24 , Fig.24 The present application provides a schematic diagram of the assembly of the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 in some other embodiments. The main body 241 of the electrode assembly 24 is in a polygonal column shape, and the first pole ear 242 and the second pole ear 243 are respectively connected to the two ends of the main body 241 in the second direction Y.

[0366] In some embodiments, a buffer (not shown) is disposed between two adjacent electrode assemblies 24 along the first direction X. That is, among the plurality of electrode assemblies 24 arranged along the first direction X, two adjacent electrode assemblies 24 are separated by a buffer.

[0367] Exemplarily, the buffer member may be of various types, such as foam, silicone pad or rubber pad.

[0368] By arranging a buffer member between two adjacent electrode assemblies 24 in the first direction X, the buffer member can play a buffering role between the two adjacent electrode assemblies 24, so that the buffer member can absorb the expansion force and collision force between the multiple electrode assemblies 24, thereby effectively alleviating the collision phenomenon between the two adjacent electrode assemblies 24, and effectively alleviating the extrusion phenomenon of the mutual expansion of the two adjacent electrode assemblies 24, thereby effectively improving the reliability and service life of the battery cell 20.

[0369] According to some embodiments of this application, see Figure 3 and Figure 4 , Fig.10 and Fig.11 , Fig.15 and Fig.16 , Fig.17 and Fig.18 as well as Fig. 22 As shown, the battery cell 20 includes N electrode assemblies 24 stacked along a first direction X, and N≥5.

[0370] For example, the number of the electrode assemblies 24 stacked along the first direction X in the housing 21 of the battery cell 20 may be five, six, seven, eight, nine, or the like.

[0371] It should be noted that, in some embodiments, the battery cell 20 may also include multiple rows of electrode assemblies 24 arranged along the third direction Z, each row of electrode assemblies 24 includes multiple electrode assemblies 24 stacked along the first direction X, and in an embodiment where the first pole ear 242 and the second pole ear 243 are both located at the same end of the main body 241, the two pole ears close to each other in two adjacent rows of electrode assemblies 24 are both the first pole ear 242 or the second pole ear 243, so that the two pole ears close to each other in two adjacent rows of electrode assemblies 24 can be connected to the same first electrode terminal 22 through a first current collecting component 23 or connected to the same second electrode terminal 25 through a second current collecting component 26.

[0372] By setting the number of electrode assemblies 24 stacked along the first direction X of the battery cells 20 to be greater than or equal to 5, a large-capacity battery cell 20 can be achieved. A large-capacity battery cell 20 can be achieved without increasing the winding size or stacking size of a single electrode assembly 24, which is beneficial to reducing the manufacturing difficulty and manufacturing cost of a single electrode assembly 24.

[0373] According to some embodiments of this application, please continue to refer to Figure 3 and Figure 4 , Fig.10 and Fig.11 , Fig.15 and Fig.16 , Fig.17 and Fig.18 as well as Fig. 22 As shown, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodation cavity having an opening 2121, and the accommodation cavity is used to accommodate the electrode assembly 24. The end cap 213 closes the opening 2121, and the end cap 213 is a wall portion 211.

[0374] The end cover 213 is the wall portion 211 , that is, the first electrode terminal 22 is mounted on the end cover 213 , and the second electrode terminal 25 is also mounted on the end cover 213 .

[0375] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an accommodating cavity with an opening 2121 formed inside. The accommodating cavity is used to accommodate the electrode assembly 24. The end cap 213 closes the opening 2121. The shell 212 includes a wall portion 211, that is, the wall portion 211 is a wall of the shell 212. The wall portion 211 may be a bottom wall of the shell 212 and the end cap 213 that are opposite to each other or a side wall of the shell 212 and the end cap 213 that are connected and adjacent to each other. In other words, the first electrode terminal 22 and the second electrode terminal 25 are both mounted on the shell 212.

[0376] By setting the wall portion 211 of the outer shell 21 as the end cap 213 of the outer shell 21 for closing the opening 2121, the battery cell 20 with such a structure is convenient for assembling the first electrode terminal 22 and other components on the end cap 213, and is convenient for connecting the first current collecting member 23 and the first electrode terminal 22, which is conducive to reducing the difficulty of assembling the battery cell 20, so as to improve the production efficiency of the battery cell 20. Similarly, by setting the wall portion 211 of the outer shell 21 as a wall of the shell 212, the battery cell 20 with such a structure can make the area of ​​the outer shell 21 where the first electrode terminal 22 and other components are installed away from the end cap 213, so as to alleviate the phenomenon that the force generated by the first electrode terminal 22 and other components pulling or twisting the wall portion 211 directly acts on the end cap 213, which is conducive to reducing the risk of connection failure between the end cap 213 and the shell 212, and thus can effectively reduce the risk of leakage of the battery cell 20 during use.

[0377] According to some embodiments of the present application, the present application further provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above schemes.

[0378] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0379] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0380] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0381] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0382] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0383] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0384] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0385] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0386] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0387] According to some embodiments of the present application, the present application further provides an energy storage cabinet, which includes a plurality of battery cells 20 according to any of the above schemes.

[0388] The energy storage cabinet includes a cabinet body, a plurality of battery cells 20 are arranged in the cabinet body, and the plurality of battery cells 20 are arranged along the second direction Y.

[0389] According to some embodiments of the present application, see Figures 10 to 14As shown, the present application provides a battery cell 20, which includes a housing 21, a first electrode terminal 22, a second electrode terminal 25, a first current collecting member 23, a second current collecting member 26, a first insulating member 27, a second insulating member 28, a third insulating member 29 and a plurality of electrode assemblies 24. The housing 21 has a wall portion 211, and the housing 21 includes a shell 212 and an end cover 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, and the end cover 213 closes the opening 2121, and the end cover 213 is a wall portion 211. The plurality of electrode assemblies 24 are all received in the receiving cavity, and the plurality of electrode assemblies 24 are stacked along a first direction X, and the wall portion 211 is provided on one side of the plurality of electrode assemblies 24 along the first direction X. The electrode assembly 24 includes a main body 241, a first electrode tab 242 and a second electrode tab 243. The first electrode tab 242 and the second electrode tab 243 are both disposed at the same end of the main body 241 along the second direction Y, and the first electrode tabs 242 of the plurality of electrode assemblies 24 are located at the same end of the main body 241, and the second electrode tabs 243 of the plurality of electrode assemblies 24 are located at the same end of the main body 241. The first electrode terminal 22 and the second electrode terminal 25 are both disposed on the same wall 211, and the first electrode terminal 22 and the second electrode terminal 25 are arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The first current collecting member 23 and the second current collecting member 26 are both disposed in the housing 21, and the first current collecting member 23 and the second current collecting member 26 are arranged at intervals along the third direction Z. The first current collecting member 23 includes a first connection portion 232 and a third connection portion 233 connected to each other. The first connection portion 232 is located on the side of the main body 241 provided with the first pole tab 242 in the second direction Y, and the first connection portion 232 is connected to the first pole tabs 242 of the plurality of electrode assemblies 24. The third connection portion 233 is located between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X. A first protrusion 234 is protruded on the side of the third connection portion 233 away from the plurality of electrode assemblies 24. The first protrusion 234 is welded to the first electrode terminal 22 to electrically connect the first electrode terminal 22 and the plurality of electrode assemblies 24. A first avoidance area 231 is provided on the first connection portion 232. The first avoidance area 231 penetrates the first connection portion 232 along the second direction Y. The first pole tab 242 passes through the first avoidance area 231 and is connected to the side of the first connection portion 232 away from the main body 241. The first avoidance area 231 is a through hole provided on the first connection portion 232 or a notch provided on an edge of the first connection portion 232 in the third direction Z.The second current collecting member 26 includes a second connection portion 262 and a fourth connection portion 263 connected to each other, the second connection portion 262 is located on the side of the main body 241 provided with the second pole tab 243 in the second direction Y, and the second connection portion 262 is connected to the second pole tabs 243 of the plurality of electrode assemblies 24, the fourth connection portion 263 is located between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X, and a second protrusion 264 is protruded on the side of the fourth connection portion 263 away from the plurality of electrode assemblies 24, and the second protrusion 264 is welded and connected to the second electrode terminal 25 to electrically connect the second electrode terminal 25 and the plurality of electrode assemblies 24. A second avoidance area 261 is provided on the second connection portion 262, and the second avoidance area 261 penetrates the second connection portion 262 along the second direction Y, and the second pole tab 243 passes through the second avoidance area 261 and is connected to the side of the second connection portion 262 away from the main body 241. The second avoidance area 261 is a through hole provided on the second connection part 262 or a notch provided on the edge of the second connection part 262 in the third direction Z. The first insulating member 27 is provided along the second direction Y on the side of the first connection part 232 and the second connection part 262 away from the main body 241 to insulate and isolate the first connection part 232 and the shell 21 and the second connection part 262 and the shell 21. The second insulating member 28 is provided along the second direction Y between the first connection part 232 and the second connection part 262 and the main body 241 to insulate and isolate the first connection part 232 and the main body 241 and the second connection part 262 and the main body 241. The third insulating member 29 is provided along the first direction X between the third connection part 233 and the fourth connection part 263 and the plurality of electrode assemblies 24 to insulate and isolate the third connection part 233 and the electrode assembly 24 and the fourth connection part 263 and the electrode assembly 24. Along the first direction X, a first slot 31 is provided on the side of the third insulating member 29 away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 ; a second slot 32 is provided on the side of the third insulating member 29 away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0390] 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.

[0391] The above are only preferred embodiments of the present application and are not intended 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: a housing having a wall portion; A first electrode terminal is mounted on the wall portion; A plurality of electrode assemblies are accommodated in the housing, the plurality of electrode assemblies are stacked along a first direction, the electrode assembly comprises a main body and a first electrode ear, along a second direction, the first electrode ear is arranged at one end of the main body, the first electrode ears of the plurality of electrode assemblies are located at the same end of the main body, and the second direction intersects with the first direction; as well as A first current collecting member electrically 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 Along the second direction, at least a portion of the first current collecting member is located on a side of the main body where the first electrode tab is disposed, and a portion of the first electrode tab is located on a side of the first current collecting member away from the main body and connected to the first current collecting member.

3. The battery cell according to claim 2, It is characterized in that The first current collecting member is provided with a first avoidance area, the first avoidance area penetrates the first current collecting member along the second direction, and the first electrode tab passes through the first avoidance area and is connected to a side of the first current collecting member away from the main body.

4. The battery cell according to claim 3, It is characterized in that The first avoidance area is a through hole provided on the first current collecting member; or The first avoidance area is a notch disposed at an edge of the first current collecting member.

5. The battery cell according to claim 1, It is characterized in that The first current collecting member is disposed in the housing; or Along the second direction, a first channel for each first pole ear to extend out is provided on one side of the shell close to the first pole ear, and each first pole ear can extend out of the shell through the corresponding first channel. The first current collecting component is provided outside the shell, and the first current collecting component is electrically connected to the extended first pole ear.

6. The battery cell according to any one of claims 1 to 5, It is characterized in that The electrode assembly further includes a second electrode tab, which is disposed at one end of the main body along the second direction, and the second electrode tabs of the plurality of electrode assemblies are located at the same end of the main body, and the polarity of the second electrode tab is opposite to that of the first electrode tab; The battery cell further includes a second electrode terminal and a second current collecting member, wherein the second electrode terminal is mounted on the wall portion, and the second current collecting member electrically connects the second electrode terminal and each of the second tabs.

7. The battery cell according to claim 6, It is characterized in that Along the second direction, at least part of the second current collecting member is located on a side of the body portion where the second electrode tab is disposed, and part of the second electrode tab is located on a side of the second current collecting member away from the body portion and connected to the second current collecting member.

8. The battery cell according to claim 7, It is characterized in that The second current collecting member is provided with a second avoidance area, the second avoidance area penetrates the first current collecting member along the second direction, and the second electrode tab passes through the second avoidance area and is connected to a side of the second current collecting member away from the main body.

9. The battery cell according to claim 8, It is characterized in that The second avoidance area is a through hole provided on the second current collecting member; or The second avoidance area is a notch disposed at an edge of the second current collecting member.

10. The battery cell according to claim 6, It is characterized in that The second current collecting member is disposed in the housing; or Along the second direction, a second channel for each second pole ear to extend out is provided on one side of the shell close to the second pole ear, and each second pole ear can extend out of the shell through the corresponding second channel. The second current collecting component is provided outside the shell, and the second current collecting component is electrically connected to the extended second pole ear.

11. The battery cell according to claim 6, It is characterized in that Along the second direction, the first pole lug and the second pole lug are both arranged at the same end of the main body, and the first pole lug and the second pole lug are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are not coplanar and intersect each other; Among them, the first current collecting component includes a first connecting portion electrically connected to each of the first pole lugs, and the second current collecting component includes a second connecting portion electrically connected to each of the second pole lugs, the first connecting portion and the second connecting portion are both located on the side of the main body where the first pole lug and the second pole lug are arranged in the second direction, and the first connecting portion and the second connecting portion are arranged at intervals along the third direction.

12. The battery cell according to claim 11, It is characterized in that The battery cell further comprises: The first insulating member is arranged along the second direction on a side of the first connecting portion and the second connecting portion away from the main body portion to insulate and isolate the first connecting portion from the shell and the second connecting portion from the shell.

13. The battery cell according to claim 11, It is characterized in that The battery cell further comprises: The second insulating member is disposed between the first connecting portion, the second connecting portion and the main body along the second direction to insulate and isolate the first connecting portion from the main body and the second connecting portion from the main body.

14. The battery cell according to claim 11, It is characterized in that Along the second direction, the wall portion is located on one side of the plurality of electrode assemblies, the first electrode tab and the second electrode tab are both arranged at one end of the main body facing the wall portion, and the first current collecting member and the second current collecting member are both arranged at one side of the main body facing the wall portion.

15. The battery cell according to claim 14, It is characterized in that Along the second direction, a first protrusion is protruded on a side of the first current collecting member facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or A second protrusion is protruded from one side of the second current collecting member facing the wall portion along the second direction, and the second protrusion is connected to the second electrode terminal.

16. The battery cell according to claim 11, It is characterized in that Along the first direction, the wall portion is located on at least one side of the plurality of electrode assemblies; Wherein, the first current collecting member further includes a third connection portion connected to the first connection portion, the third connection portion is located on a side of the plurality of electrode assemblies facing the wall portion in the first direction, and the third connection portion is connected to the first electrode terminal; The second current collecting member further includes a fourth connection portion connected to the second connection portion, the fourth connection portion is located at a side of the plurality of electrode assemblies facing the wall portion in the first direction, and the fourth connection portion is connected to the second electrode terminal.

17. The battery cell according to claim 16, It is characterized in that Along the first direction, a first protrusion is protruded on a side of the third connection portion facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or Along the first direction, a second protrusion is protruded from a side of the fourth connection portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

18. The battery cell according to claim 16, It is characterized in that Along the first direction, the first electrode terminal and the second electrode terminal are both arranged on the same side of the plurality of electrode assemblies, and the third connecting portion and the fourth connecting portion are both located on a side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal.

19. The battery cell according to claim 18, It is characterized in that The battery cell further comprises: The third insulating member is disposed between the third connecting portion and the fourth connecting portion and the plurality of electrode assemblies along the first direction to insulate and isolate the third connecting portion and the electrode assemblies and the fourth connecting portion and the electrode assemblies.

20. The battery cell according to claim 19, It is characterized in that Along the first direction, a first slot is provided on a side of the third insulating member away from the electrode assembly, and the third connecting portion is accommodated in the first slot; and / or Along the first direction, a second slot is provided on a side of the third insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second slot.

21. The battery cell according to claim 16, It is characterized in that Along the first direction, the housing has two wall portions that are arranged opposite to each other, the two wall portions are respectively located on both sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively arranged on the two wall portions; The third connection portion is located on a side of the plurality of electrode assemblies facing the first electrode terminal, and the fourth connection portion is located on a side of the plurality of electrode assemblies facing the second electrode terminal.

22. The battery cell according to claim 21, It is characterized in that The battery cell further comprises: The third insulating member and the fourth insulating member are respectively arranged on both sides of the plurality of electrode assemblies along the first direction, the third insulating member is located between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly, and the fourth insulating member is located between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion and the electrode assembly.

23. The battery cell according to claim 22, It is characterized in that Along the first direction, a first slot is provided on a side of the third insulating member away from the electrode assembly, and the third connecting portion is accommodated in the first slot; and / or Along the first direction, a second slot is provided on a side of the fourth insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second slot.

24. The battery cell according to claim 6, It is characterized in that Along the second direction, the first pole lug and the second pole lug are respectively arranged at two ends of the main body; The first current collecting member includes a first connection portion electrically connected to each of the first pole ears, and the first connection portion is located on a side of the main body where the first pole ears are arranged in the second direction; the second current collecting member includes a second connection portion electrically connected to each of the second pole ears, and the second connection portion is located on a side of the main body where the second pole ears are arranged in the second direction.

25. The battery cell according to claim 24, It is characterized in that The battery cell further comprises: Two first insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the second direction, one of the first insulating members is located on the side of the first connecting part away from the main body to insulate and isolate the first connecting part and the outer shell, and the other first insulating member is located on the side of the second connecting part away from the main body to insulate and isolate the second connecting part and the outer shell.

26. The battery cell according to claim 24, It is characterized in that The battery cell further comprises: Two second insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the second direction, one second insulating member is located between the first connecting part and the main body to insulate and isolate the first connecting part and the main body, and the other second insulating member is located between the second connecting part and the main body to insulate and isolate the second connecting part and the main body.

27. The battery cell according to claim 24, It is characterized in that Along the first direction, the wall portion is located on at least one side of the plurality of electrode assemblies; Wherein, the first current collecting member further includes a third connection portion connected to the first connection portion, the third connection portion is located on a side of the plurality of electrode assemblies facing the wall portion in the first direction, and the third connection portion is connected to the first electrode terminal; The second current collecting member further includes a fourth connection portion connected to the second connection portion, the fourth connection portion is located at a side of the plurality of electrode assemblies facing the wall portion in the first direction, and the fourth connection portion is connected to the second electrode terminal.

28. The battery cell according to claim 27, It is characterized in that Along the first direction, a first protrusion is protruded on a side of the third connection portion facing the wall portion, and the first protrusion is connected to the first electrode terminal; and / or Along the first direction, a second protrusion is protruded from a side of the fourth connection portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

29. The battery cell according to claim 27, It is characterized in that Along the first direction, the first electrode terminal and the second electrode terminal are both arranged on the same side of the plurality of electrode assemblies, and the third connecting portion and the fourth connecting portion are both located on a side of the plurality of electrode assemblies facing the first electrode terminal and the second electrode terminal.

30. The battery cell according to claim 29, It is characterized in that The battery cell further comprises: The third insulating member is disposed between the third connecting portion and the fourth connecting portion and the plurality of electrode assemblies along the first direction to insulate and isolate the third connecting portion and the electrode assemblies and the fourth connecting portion and the electrode assemblies.

31. The battery cell according to claim 30, It is characterized in that Along the first direction, a first slot is provided on a side of the third insulating member away from the electrode assembly, and the third connecting portion is accommodated in the first slot; and / or Along the first direction, a second slot is provided on a side of the third insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second slot.

32. The battery cell according to claim 27, It is characterized in that Along the first direction, the housing has two wall portions that are arranged opposite to each other, the two wall portions are respectively located on both sides of the plurality of electrode assemblies, and the first electrode terminal and the second electrode terminal are respectively arranged on the two wall portions; The third connection portion is located on a side of the plurality of electrode assemblies facing the first electrode terminal, and the fourth connection portion is located on a side of the plurality of electrode assemblies facing the second electrode terminal.

33. The battery cell according to claim 32, It is characterized in that The battery cell further comprises: The third insulating member and the fourth insulating member are respectively arranged on both sides of the plurality of electrode assemblies along the first direction, the third insulating member is located between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly, and the fourth insulating member is located between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion and the electrode assembly.

34. The battery cell according to claim 33, It is characterized in that Along the first direction, a first slot is provided on a side of the third insulating member away from the electrode assembly, and the third connecting portion is accommodated in the first slot; and / or Along the first direction, a second slot is provided on a side of the fourth insulating member facing away from the electrode assembly, and the fourth connecting portion is accommodated in the second slot.

35. The battery cell according to claim 1, It is characterized in that Along the first direction, a buffer is arranged between two adjacent electrode assemblies.

36. The battery cell according to claim 1, It is characterized in that The battery cell includes N electrode assemblies stacked along the first direction, and N≥5.

37. The battery cell according to claim 1, It is characterized in that The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion; or The housing includes the wall portion.

38. A battery, It is characterized in that Comprising a battery cell as described in any one of claims 1-37.

39. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 37, wherein the battery cell is used to provide electrical energy.

40. An energy storage cabinet, It is characterized in that The invention comprises a plurality of battery cells according to any one of claims 1 to 37.

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