Battery cell, battery, electric device and energy storage cabinet

Abstract

A battery cell (20), a battery (100), an electric device and an energy storage cabinet, relating to the technical field of batteries. The battery cell (20) comprises a casing (21), a first electrode terminal (22), a first current collecting member (23) and a plurality of electrode assemblies (24). The casing (21) is provided with a wall portion (211). The first electrode terminal (22) is mounted to the wall portion (211). The plurality of electrode assemblies (24) are accommodated in the casing (21), and the plurality of electrode assemblies (24) are stacked in a first direction; each electrode assembly (24) comprises a main body part (241) and a first tab (242), wherein in a second direction, the first tab (242) is arranged at one end of the main body part (241); the first tabs (242) of the plurality of electrode assemblies (24) are located at the same ends of the main body parts (241); and the second direction intersects with the first direction. The first current collecting member (23) is electrically connected to the first electrode terminal (22) and each first tab (242). Therefore, a plurality of first current collecting members (23) do not need to be provided in the casing (21) to be connected to the first tabs (242) of the plurality of electrode assemblies (24), and the thickness or size of a single electrode assembly (24) does not need to be increased, thereby effectively reducing the manufacturing difficulty of the electrode assemblies (24), and thus reducing the manufacturing difficulty of the large-capacity battery cell (20).

Description

Battery cells, batteries, electrical devices and energy storage cabinets

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 2023116754474, filed on December 6, 2023, entitled “Battery Cell, Battery, Electrical Device and Energy Storage Cabinet,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] In recent years, new energy vehicles have experienced rapid development. 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 has also increased. As the core components of new energy vehicles, batteries have high requirements in terms of performance. Among them, the battery cell of a battery generally includes a housing and an electrode assembly housed in the housing. 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 manufacturing difficulty of existing large-capacity battery cells is relatively large, which is not conducive to improving the production efficiency of the battery cell and is not conducive to reducing the manufacturing cost of the battery cell.

[0005] Summary of the Invention

[0006] 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.

[0007] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, a first electrode terminal, a first current collecting member and a plurality of electrode assemblies; the shell has a wall portion; the first electrode terminal is mounted on the wall portion; a plurality of electrode assemblies are accommodated in the shell, and the plurality of electrode assemblies are stacked along a first direction, the electrode assembly comprising a main body and a first pole tab, along a second direction, the first pole tab is arranged at one end of the main body, and the first pole tabs 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; the first current collecting member electrically connects the first electrode terminal and each of the first pole tabs.

[0008] In the above technical solution, a plurality of electrode assemblies stacked along a first direction are provided in the outer shell of the battery cell, and 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 component to realize the input or output of electrical energy of the battery cell. By stacking a plurality of electrode assemblies in the outer shell, the number of electrode assemblies accommodated in the outer shell of the battery cell is increased, which is beneficial to improving the electrical capacity of the battery cell. A battery cell adopting this 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 component to realize the input or output of electrical energy of a large-capacity battery cell. There is no need to set a plurality of first current collecting components 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, 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.

[0009] 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 tab is disposed, and a portion of the first 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.

[0010] In the above technical solution, by setting at least a portion of the first current collecting member 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 member and the first pole ear, it is beneficial to reduce the difficulty of assembling the first current collecting member and the first pole ear. Specifically, by setting a portion of the first pole ear to be located on the side of the first current collecting member away from the main body in the second direction, and the portion is connected to the first current collecting member, so that the first pole ear is a structure that bypasses the first current collecting member and is connected to the side of the first current collecting member 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 member, and on the other hand, it can reduce the phenomenon that the first current collecting member presses the first pole ear downward toward the side close to the main body, thereby reducing the risk of short circuit caused by the first pole ear being inserted upside down into the main body.

[0011] 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.

[0012] In the above technical solution, a first avoidance area is provided 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, so that 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 facilitates the first pole ear to be set 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.

[0013] 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.

[0014] In the above technical solution, the first avoidance area can be a through hole provided on the first current collecting component or a notch provided at the edge of the first current collecting component, so that the first electrode tab 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.

[0015] In some embodiments, the first current collecting member is disposed inside the shell; or, along the second direction, a first channel for each first pole tab to extend is provided on one side of the shell close to the first pole tab, and each first pole tab can extend out of the shell through the corresponding first channel, and the first current collecting member is disposed outside the shell, and the first current collecting member is electrically connected to the extended first pole tab.

[0016] In the above technical solution, by arranging the first current collecting member inside the housing, the difficulty of assembling the first tab electrically connected to the first electrode terminal via the first current collecting member is reduced, thereby improving the production efficiency of the battery cell. The housing also provides a certain degree of protection for the first current collecting member, thereby reducing wear or damage to the first current collecting member during use. By arranging the first current collecting member outside the housing and providing a first hole in the housing for the first tab to pass through, the first tab can be electrically connected to the first electrode terminal via the first current collecting member after passing through the housing. Battery cells employing this structure facilitate later inspection, maintenance, and replacement of the first current collecting member, thereby reducing the maintenance cost of the battery cells.

[0017] In some embodiments, the electrode assembly further includes a second electrode tab, which is arranged at one end of the main body along the second direction, and the second electrode tabs of multiple 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; wherein the battery cell further includes a second electrode terminal and a second current collecting member, 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 electrode tabs.

[0018] 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. The second electrode ears of the multiple electrode assemblies are all located at the same end of the main body in the second direction, and the second electrode ears of the multiple electrode assemblies are all electrically connected to the second electrode terminal through the second current collecting component to realize the input or output of electrical 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 multiple electrode assemblies through a second current collecting component to realize the input or output of electrical energy of the large-capacity battery cell. There is no need to set multiple second current collecting components in the outer shell to connect with the second electrode ears of the multiple 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.

[0019] In some embodiments, along the second direction, at least a portion of the second current collecting member is located on a side of the main body where the second tab is disposed, and a portion of the second tab is located on a side of the second current collecting member away from the main body and connected to the second current collecting member.

[0020] In the above technical solution, by arranging at least a portion 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. Specifically, by arranging a portion 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 portion 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 to the second current collecting member, and on the other hand, it can reduce the phenomenon of the second current collecting member pressing the second pole ear downward in the direction close to the main body, thereby reducing the risk of short circuit caused by the second pole ear being inserted upside down into the main body.

[0021] 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.

[0022] In the above technical solution, a second avoidance area is provided 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, so that 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 facilitates the second pole ear to be set 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 redundancy of the second pole ear and reducing the manufacturing cost of the battery cell.

[0023] 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.

[0024] In the above technical solution, the second avoidance area can be a through hole provided on the second current collecting component or a notch provided at the edge of the second current collecting component, so that the second electrode tab 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.

[0025] In some embodiments, the second current collecting member is disposed inside the housing; or, along the second direction, a second channel for each second pole tab to extend is provided on one side of the housing close to the second pole tab, and each second pole tab can extend out of the housing through the corresponding second channel, and the second current collecting member is disposed outside the housing, and the second current collecting member is electrically connected to the extended second pole tab.

[0026] In the above technical solution, by arranging the second current collecting member inside the housing, the difficulty of assembling the electrical connection between the second tab and the second electrode terminal via the second current collecting member is reduced, thereby improving the production efficiency of the battery cell. The housing also provides a certain degree of protection for the second current collecting member, thereby reducing wear or damage to the second current collecting member during use. By arranging the second current collecting member outside the housing and providing a second hole in the housing for the second tab to pass through, the second tab can be electrically connected to the second electrode terminal through the second current collecting member after passing through the housing. Battery cells employing this structure facilitate later inspection, maintenance, and replacement of the second current collecting member, thereby reducing the maintenance cost of the battery cells.

[0027] 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 with 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 in the second direction where the first pole lug and the second pole lug are provided, and the first connecting portion and the second connecting portion are arranged at intervals along the third direction.

[0028] In the above technical solution, by arranging the first electrode tab and the second electrode tab 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 electrode tab and the second electrode tab are arranged, on the one hand, it is convenient to connect the first current collecting member to the first electrode tab, and to connect the second current collecting member to the second electrode tab, which is conducive to reducing the difficulty of assembling the first current collecting member and the second current collecting member. On the other hand, it enables the first current collecting member and the second current collecting member to 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 and improving the energy density of the battery cell.

[0029] In some embodiments, the battery cell further includes a first insulating member; the first insulating member is arranged along the second direction on the 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 and the shell and the second connecting portion and the shell.

[0030] 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 part and the second connecting part away from the main body, so that the first insulating member is located between the first connecting part and the second connecting part and the shell 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 shell and between the second connecting part and the shell, which is beneficial to reducing the risk of short circuit between the first current collecting member and the second current collecting member and the shell. 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 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.

[0031] In some embodiments, the battery cell further includes a second insulating member 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.

[0032] 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 reducing 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.

[0033] 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 facing the wall portion, and the first current collecting member and the second current collecting member are both arranged on one side of the main body facing the wall portion.

[0034] In the above technical solution, the wall portion is located on the side where the first and second electrode tabs are provided on the second direction of the multiple 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 electrode tab and the first electrode terminal provided on the wall portion, and it is convenient for the second current collecting member to connect the second electrode tab 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 can 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.

[0035] In some embodiments, along the second direction, a first protrusion is provided 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, along the second direction, a second protrusion is provided on a side of the second current collecting member facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0036] In the above technical solution, a first protrusion is provided on a side of the first current collecting member facing the wall in the second direction, and the first protrusion is interconnected with the first electrode terminal to achieve electrical connection between the first current collecting member and the first electrode terminal. This structure of the first current collecting member reduces the difficulty of assembling the first current collecting member and the first electrode terminal, and the interconnection between the first protrusion and the first electrode terminal improves the reliability of the connection between the first current collecting member and the first electrode terminal. Similarly, a second protrusion is provided on a side of the second current collecting member facing the wall in the second direction, and the second protrusion is interconnected with the second electrode terminal to achieve electrical connection between the second current collecting member and the second electrode terminal. This structure of the second current collecting member reduces the difficulty of assembling the second current collecting member and the second electrode terminal, and the interconnection between the second protrusion and the second electrode terminal improves the reliability of the connection between the second current collecting member and the second electrode terminal.

[0037] 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.

[0038] In the above technical solution, the wall portion of the shell is located on at least one side of the multiple electrode assemblies in the first direction, so that the wall portion and the arrangement direction of the multiple electrode assemblies are the same, and the first current collecting member has a third connecting portion located on the side of the multiple electrode assemblies facing the wall portion in the first direction, and the third connecting portion and the first connecting portion are connected to each other. By connecting the third connecting portion to the first electrode terminal provided on the wall portion, and connecting the first connecting portion to the first pole ears of the multiple electrode assemblies, the first pole ear is electrically connected to the first electrode terminal through the first current collecting member. On the one hand, the battery cell adopting this structure can realize the separation of 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 where the first pole ear is provided is No first electrode terminal is provided, which facilitates stacking of multiple battery cells 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 tab 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 tab, and can reduce the interference between the first electrode terminal and the first pole tab, especially when the first electrode terminal and the first pole tab are both welded to the first current collecting member, it can effectively reduce 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 tab and the first current collecting member, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first pole tab connected to the first current collecting member. Similarly, the second current collecting member has a fourth connecting portion located on the side of the multiple electrode assemblies facing the wall in the first direction. By connecting the fourth connecting portion to the second electrode terminal provided on the wall, and connecting the second connecting portion to the second pole tabs of the multiple electrode assemblies, the second pole tabs are electrically connected to the second electrode terminal through the second current collecting member. On the one hand, a battery cell adopting this structure can 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 tab is provided, so that the area of ​​the outer shell facing the side of the main body where the second pole tab is provided is not provided with the second electrode terminal, thereby facilitating the stacking of multiple 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 conducive 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. In particular, 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 conducive to improving the assembly quality and stability of the second electrode terminal and the second tab connected to the second current collecting member.

[0039] In some embodiments, along the first direction, a first protrusion is provided on 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 provided on the side of the fourth connecting portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0040] In the above technical solution, the third connecting portion of the first current collecting member is provided with a first protrusion on a side facing the wall in the first direction. The first protrusion is interconnected with the first electrode terminal to achieve electrical connection between the first current collecting member and the first electrode terminal. This structure of the first current collecting member reduces the difficulty of assembling the third connecting portion of the first current collecting member and the first electrode terminal, and the interconnection between the first protrusion and the first electrode terminal improves the connection reliability between the third connecting portion of the first current collecting member and the first electrode terminal. Similarly, the fourth connecting portion of the second current collecting member is provided with a second protrusion on a side facing the wall in the first direction. The second protrusion is interconnected with the second electrode terminal to achieve electrical connection between the second current collecting member and the second electrode terminal. This structure of the second current collecting member reduces the difficulty of assembling the fourth connecting portion of the second current collecting member and the second electrode terminal, and the interconnection between the second protrusion and the second electrode terminal improves the connection reliability between the fourth connecting portion of the second current collecting member and the second electrode terminal.

[0041] 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 multiple electrode assemblies, and the third connection portion and the fourth connection portion are both located on the side of the multiple electrode assemblies facing the first electrode terminal and the second electrode terminal.

[0042] 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 configured to have the first electrode terminal and the second electrode terminal 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 thereby increasing the energy density of the battery cell.

[0043] In some embodiments, the battery cell further includes a third insulating member; the third insulating member is arranged along the first direction between the third connecting portion and the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly and the fourth connecting portion and the electrode assembly.

[0044] 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 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 reducing 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.

[0045] 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.

[0046] In the above technical solution, by providing a first slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the third connecting portion of the first current collecting member can be accommodated within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the multiple electrode assemblies. The third insulating member and the third connecting portion can also share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell. Similarly, by providing a second slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the fourth connecting portion of the second current collecting member can be accommodated within the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion and the multiple electrode assemblies. The third insulating member and the fourth connecting portion can also share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell.

[0047] In some embodiments, along the first direction, the outer shell has two wall portions arranged opposite to each other, and 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.

[0048] 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 can realize that the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are kept 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.

[0049] In some embodiments, the battery cell further 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.

[0050] 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.

[0051] 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.

[0052] In the above technical solution, by providing a first slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the third connecting portion of the first current collecting member can be accommodated within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the multiple electrode assemblies. The third insulating member and the third connecting portion can share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell. Similarly, by providing a second slot on the side of the fourth insulating member facing away from the electrode assembly along the first direction, the fourth connecting portion of the second current collecting member can be accommodated within the second slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connecting portion and the multiple electrode assemblies. The fourth insulating member and the fourth connecting portion can share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell.

[0053] In some embodiments, along the second direction, the first electrode tab and the second electrode tab are respectively arranged at both ends of the main body; wherein, the first current collecting member includes a first connecting portion electrically connecting each of the first electrode tabs, and the first connecting portion is located on the side of the main body where the first electrode tab is provided in the second direction, and the second current collecting member includes a second connecting portion electrically connecting each of the second electrode tabs, and the second connecting portion is located on the side of the main body where the second electrode tab is provided in the second direction.

[0054] In the above technical solution, by respectively arranging the first pole tab and the second pole tab 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 tab and the second pole tab 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, it can make the first pole tab and the second pole tab with opposite polarities stay away from each other, and can make the first connecting portion of the first current collecting member and the second connecting portion of the second current collecting member stay away from each other, which is conducive to reducing the risk of short circuit between the first pole tab and the second pole tab and between the first current collecting member and the second current collecting member, so as to improve the reliability of the battery cell.

[0055] In some embodiments, the battery cell further 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 portion away from the main body portion to insulate and isolate the first connecting portion and the outer shell, and the other first insulating member is located on the side of the second connecting portion away from the main body portion to insulate and isolate the second connecting portion and the outer shell.

[0056] 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 facing away from the electrode assembly and the side of the second connecting portion of the second current collecting member facing away from the electrode assembly, so that a first insulating member is provided 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 reducing 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.

[0057] 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 portion and the main body to insulate and isolate the first connecting portion and the main body, and the other second insulating member is located between the second connecting portion and the main body to insulate and isolate the second connecting portion and the main body.

[0058] 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 provided between the first connecting part and the main body, and between the second connecting part and the main body. Therefore, the two first insulating members can respectively achieve 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 reducing 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.

[0059] 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.

[0060] In the above technical solution, the wall portion of the shell is located on at least one side of the multiple electrode assemblies in the first direction, so that the wall portion and the arrangement direction of the multiple electrode assemblies are the same, and the first current collecting member has a third connecting portion located on the side of the multiple electrode assemblies facing the wall portion in the first direction, and the third connecting portion and the first connecting portion are connected to each other. By connecting the third connecting portion to the first electrode terminal provided on the wall portion, and connecting the first connecting portion to the first pole ears of the multiple electrode assemblies, the first pole ear is electrically connected to the first electrode terminal through the first current collecting member. On the one hand, the battery cell adopting this structure can realize the separation of 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 where the first pole ear is provided is No first electrode terminal is provided, which facilitates stacking of multiple battery cells 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 tab 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 tab, and can reduce the interference between the first electrode terminal and the first pole tab, especially when the first electrode terminal and the first pole tab are both welded to the first current collecting member, it can effectively reduce 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 tab and the first current collecting member, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first pole tab connected to the first current collecting member. Similarly, the second current collecting member has a fourth connecting portion located on the side of the multiple electrode assemblies facing the wall in the first direction. By connecting the fourth connecting portion to the second electrode terminal provided on the wall, and connecting the second connecting portion to the second pole tabs of the multiple electrode assemblies, the second pole tabs are electrically connected to the second electrode terminal through the second current collecting member. On the one hand, a battery cell adopting this structure can 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 tab is provided, so that the area of ​​the outer shell facing the side of the main body where the second pole tab is provided is not provided with the second electrode terminal, thereby facilitating the stacking of multiple 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 conducive 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. In particular, 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 conducive to improving the assembly quality and stability of the second electrode terminal and the second tab connected to the second current collecting member.

[0061] In some embodiments, along the first direction, a first protrusion is provided on 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 provided on the side of the fourth connecting portion facing the wall portion, and the second protrusion is connected to the second electrode terminal.

[0062] In the above technical solution, the third connecting portion of the first current collecting member is provided with a first protrusion on a side facing the wall in the first direction. The first protrusion is interconnected with the first electrode terminal to achieve electrical connection between the first current collecting member and the first electrode terminal. This structure of the first current collecting member reduces the difficulty of assembling the third connecting portion of the first current collecting member and the first electrode terminal, and the interconnection between the first protrusion and the first electrode terminal improves the connection reliability between the third connecting portion of the first current collecting member and the first electrode terminal. Similarly, the fourth connecting portion of the second current collecting member is provided with a second protrusion on a side facing the wall in the first direction. The second protrusion is interconnected with the second electrode terminal to achieve electrical connection between the second current collecting member and the second electrode terminal. This structure of the second current collecting member reduces the difficulty of assembling the fourth connecting portion of the second current collecting member and the second electrode terminal, and the interconnection between the second protrusion and the second electrode terminal improves the connection reliability between the fourth connecting portion of the second current collecting member and the second electrode terminal.

[0063] 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 multiple electrode assemblies, and the third connection portion and the fourth connection portion are both located on the side of the multiple electrode assemblies facing the first electrode terminal and the second electrode terminal.

[0064] 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 configured to have the first electrode terminal and the second electrode terminal 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 thereby increasing the energy density of the battery cell.

[0065] In some embodiments, the battery cell further includes a third insulating member; the third insulating member is arranged along the first direction between the third connecting portion and the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion and the electrode assembly and the fourth connecting portion and the electrode assembly.

[0066] 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 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 reducing 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.

[0067] 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.

[0068] In the above technical solution, by providing a first slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the third connecting portion of the first current collecting member can be accommodated within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the multiple electrode assemblies. The third insulating member and the third connecting portion can also share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell. Similarly, by providing a second slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the fourth connecting portion of the second current collecting member can be accommodated within the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion and the multiple electrode assemblies. The third insulating member and the fourth connecting portion can also share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell.

[0069] In some embodiments, along the first direction, the outer shell has two wall portions arranged opposite to each other, and 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.

[0070] 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. 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, thereby improving the reliability of the battery cell.

[0071] In some embodiments, the battery cell further 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.

[0072] 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.

[0073] 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.

[0074] In the above technical solution, by providing a first slot on the side of the third insulating member facing away from the electrode assembly along the first direction, the third connecting portion of the first current collecting member can be accommodated within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the multiple electrode assemblies. The third insulating member and the third connecting portion can share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell. Similarly, by providing a second slot on the side of the fourth insulating member facing away from the electrode assembly along the first direction, the fourth connecting portion of the second current collecting member can be accommodated within the second slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connecting portion and the multiple electrode assemblies. The fourth insulating member and the fourth connecting portion can share space in the first direction, which is beneficial for improving the internal space utilization of the battery cell.

[0075] In some embodiments, a buffer is provided between two adjacent electrode assemblies along the first direction.

[0076] 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.

[0077] In some embodiments, the battery cell includes N electrode assemblies stacked along the first direction, where N≥5.

[0078] 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.

[0079] In some embodiments, the outer shell includes a shell and an end cover; a housing having an opening is formed inside the shell, and the housing 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.

[0080] In the above technical solution, by configuring the wall portion of the outer shell as an end cap for closing the opening of the outer shell, a battery cell employing this structure facilitates assembly of components such as the first electrode terminal on the end cap, and facilitates connection between the first current collecting member and the first electrode terminal, thereby reducing the difficulty of battery cell assembly and improving battery cell production efficiency. Similarly, by configuring the wall portion of the outer shell as a wall of the housing, a battery cell employing this structure can position the area of ​​the outer shell where components such as the first electrode terminal are mounted away from the end cap, thereby alleviating the direct effect of forces exerted on the end cap by components such as the first electrode terminal pulling or twisting the wall portion. This reduces the risk of connection failure between the end cap and the housing, thereby effectively reducing the risk of leakage during use of the battery cell.

[0081] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0082] 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.

[0083] 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

[0084] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0085] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0086] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0087] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0088] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0089] FIG5 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application;

[0090] FIG6 is a schematic diagram of the assembly of a first current collecting member and an electrode assembly of a battery cell provided in some embodiments of the present application;

[0091] FIG7 is a schematic structural diagram of a first current collecting member of a battery cell provided in some embodiments of the present application;

[0092] FIG8 is a schematic structural diagram of a first current collecting member of a battery cell provided in some embodiments of the present application in another embodiment;

[0093] FIG9 is a schematic structural diagram of a second current collecting member of a battery cell provided in some embodiments of the present application;

[0094] FIG10 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0095] FIG11 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0096] FIG12 is a schematic diagram of the assembly of a first current collecting member and an electrode assembly of a battery cell provided in still other embodiments of the present application;

[0097] FIG13 is a schematic structural diagram of a first current collecting member of a battery cell provided in yet other embodiments of the present application;

[0098] FIG14 is a schematic structural diagram of a second current collecting member of a battery cell provided in yet other embodiments of the present application;

[0099] FIG15 is a schematic structural diagram of a battery cell in other embodiments provided by yet other embodiments of the present application;

[0100] FIG16 is an exploded view of the structure of a battery cell provided in other embodiments of the present application;

[0101] FIG17 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application;

[0102] FIG18 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0103] FIG19 is a schematic diagram of the assembly of a first current collecting member and an electrode assembly of a battery cell provided in some further embodiments of the present application;

[0104] FIG20 is a schematic structural diagram of a first current collecting member of a battery cell provided in some further embodiments of the present application;

[0105] FIG21 is a schematic structural diagram of a second current collecting member of a battery cell provided in some further embodiments of the present application;

[0106] FIG22 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0107] FIG23 is a schematic diagram of the assembly of a first current collecting member and an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0108] FIG24 is a schematic diagram of the assembly of the first current collecting member and the electrode assembly of the battery cell provided in some other embodiments of the present application.

[0109] Icons: 1000-vehicle; 100-battery; 10-housing; 11-first housing; 12-second housing; 20-battery cell; 21-housing; 211-wall; 212-housing; 2121-opening; 213-end cap; 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 electrode tab; 243-second electrode tab; 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

[0110] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0111] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0112] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0113] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0114] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0115] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0116] The term "plurality" used in this application refers to two or more (including two).

[0117] 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.

[0118] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0119] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0120] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0121] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0122] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0123] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and at least one of its modified compounds, etc.

[0124] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0125] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0126] As an example, the negative electrode current collector may be a metal foil, a metal foam, 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 metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0127] 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.

[0128] 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 provided on either or both of the two facing surfaces of the negative electrode current collector.

[0129] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well 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.

[0130] 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.

[0131] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0132] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0133] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0134] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0135] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0136] 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 bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0137] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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.

[0138] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0139] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0140] 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, or the like.

[0141] 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.

[0142] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0143] 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.

[0144] In some embodiments, the electrode assembly is a laminate structure.

[0145] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0146] 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.

[0147] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0148] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0149] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0150] In some embodiments, the shape of the electrode assembly can be flat or polygonal.

[0151] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0152] In some embodiments, a 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 (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0153] As an example, the battery cell may be a prismatic battery cell, a soft-pack battery cell, or a battery cell of another shape. Prismatic battery cells include but are not limited to square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries, such as hexagonal prismatic batteries.

[0154] 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.

[0155] 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.

[0156] 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 housed in the case.

[0157] 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.

[0158] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0159] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, such as energy density, cycle life, capacity, charge and discharge rate, and other performance parameters.

[0160] For general battery cells, the battery cell usually includes a shell and an electrode assembly housed in the shell. As the demand for the capacity of the battery cell becomes higher and higher, in large-capacity battery cells in related technologies, 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 electrode assembly is increased to increase the capacity of the electrode assembly. However, for battery cells with this structure, when the stacking thickness of the electrode assembly is increased, the size of the electrode sheet needs to be increased accordingly, 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 is more difficult, 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.

[0161] Based on the above considerations, in order to solve the problem of the greater 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 housed in the housing, and the plurality of electrode assemblies are stacked along a first direction. The electrode assemblies include a main body and a first tab. Along a second direction, the first tab is arranged at one end of the main body, and the first tabs of the plurality of electrode assemblies are located at the same end of the main body. The second direction intersects the first direction. The first current collecting member electrically connects the first electrode terminal and each first tab.

[0162] In a battery cell of this structure, a plurality of electrode assemblies stacked along a first direction are provided in the outer shell of the battery cell, the first pole tabs 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 tabs of the plurality of electrode assemblies are all electrically connected to the first electrode terminal through the first current collecting component to realize the input or output of electrical energy of the battery cell. By stacking a plurality of electrode assemblies in the outer shell, the number of electrode assemblies accommodated in the outer shell of the battery cell is increased, which is beneficial to improving the electrical capacity of the battery cell. A battery cell adopting this structure only needs to stack a plurality of electrode assemblies in the outer shell and connect the first pole tabs of the plurality of electrode assemblies through a first current collecting component to realize the input or output of electrical energy of a large-capacity battery cell. There is no need to set a plurality of first current collecting components in the outer shell to connect the first pole tabs 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.

[0163] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This can help alleviate the difficulty of manufacturing the battery cells during assembly, thereby improving battery cell production efficiency and reducing battery cell manufacturing costs.

[0164] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0165] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0166] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 can be arranged 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 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0167] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0168] 2 and 3 , FIG2 is an exploded view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0169] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0170] 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, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0171] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0172] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0173] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be a rectangular parallelepiped, a prism, or other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0174] According to some embodiments of the present application, referring to FIG3 and further to FIG4, FIG5, and FIG6, FIG4 is an exploded view of a battery cell 20 according to some embodiments of the present application, FIG5 is a schematic diagram of the structure of an electrode assembly 24 according to some embodiments of the present application, and FIG6 is a schematic diagram of the assembly of a first current collecting member 23 and an electrode assembly 24 of a battery cell 20 according to some embodiments of the present application. This application provides a battery cell 20 comprising 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 211. The first electrode terminal 22 is mounted to the wall 211. The plurality of electrode assemblies 24 are housed within the housing 21 and stacked along a first direction X. The electrode assemblies 24 include a main body 241 and a first electrode tab 242. The first electrode tab 242 is disposed at one end of the main body 241 along a second direction Y. The first electrode tab 242 of the plurality of electrode assemblies 24 is located at the same end of the main body 241. The second direction Y intersects the first direction X. The first current collecting member 23 electrically connects the first electrode terminal 22 and each of the first electrode tabs 242 .

[0175] The housing 21 may also be used to contain electrolytes, such as electrolyte, etc. The housing 21 may also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0176] In some embodiments, the housing 21 may include a shell 212 and an end cover 213. A accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 24. The accommodating cavity has an opening 2121. That is, the shell 212 is a hollow structure with an opening 2121 at one end. The end cover 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.

[0177] When assembling the battery cell 20 , the electrode assembly 24 may be placed in the housing 212 and filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0178] The housing 212 can have a variety of shapes, such as a rectangular parallelepiped or a prismatic structure. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 has a rectangular parallelepiped structure, a rectangular housing 212 can be selected. Of course, the end cap 213 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in FIG4 , the housing 212 has a rectangular parallelepiped structure, and the end cap 213 has a plate-like structure.

[0179] It should be noted that the wall portion 211 for mounting the electrode terminal can be the end cap 213 of the outer shell 21 or a wall of the housing 212. For example, in Figures 3 and 4, the wall portion 211 is the end cap 213 of the outer shell 21. Of course, in some embodiments, the wall portion 211 can also be the bottom wall of the outer shell 212 and the end cap 213 of the outer shell 21, which are arranged opposite each other, or the side wall of the outer shell 212 and the end cap 213 of the outer shell 21, which are connected and adjacent to each other.

[0180] Of course, it is understandable that the shell 21 is not limited to the above structure. The shell 21 may also be other structures. For example, the shell 21 may include a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an 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. That is, the shell 212 is formed with openings 2121 on opposite sides, and the two end covers 213 are respectively covered on both sides of the shell 212 to close the corresponding openings 2121.

[0181] 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 various. For example, the electrode assembly 24 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0182] Illustratively, the separator 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.

[0183] The electrode assembly 24 includes a main body 241 and a first tab 242 and a second tab 243 connected to the main body 241. The first tab 242 and the second tab 243 have opposite polarities and serve as the positive and negative electrodes of the electrode assembly 24, respectively. The main body 241 of the electrode assembly 24 is the primary area where chemical reactions occur within the battery cell 20. The main body 241 is a wound structure consisting of the area of ​​the positive electrode sheet coated with the positive active material layer, the separator, and the area of ​​the negative electrode sheet coated with the negative active material layer. The main body 241 operates primarily by the movement of metal ions between the positive and negative electrode sheets of opposite polarity.

[0184] Along the second direction Y, the first pole tab 242 is arranged at one end of the main body 241, and the first pole tabs 242 of the multiple electrode assemblies 24 are located at the same end of the main body 241, that is, the first pole tab 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 tabs 242 are all located at the same end of the corresponding main body 241.

[0185] 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 is 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.

[0186] The second pole tab 243 is also arranged at one end of the main body 241 in the second direction Y. The second pole tab 243 and the second pole tabs 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 tab 243 and the first pole tab 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.

[0187] 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. If the first electrode tab 242 is the positive electrode of the electrode assembly 24, then the first electrode tab 242 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer. Correspondingly, if the second electrode tab 243 is the negative electrode of the electrode assembly 24, then the second electrode tab 243 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. If the first electrode tab 242 is the negative electrode of the electrode assembly 24, then the first electrode tab 242 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. Correspondingly, if the second electrode tab 243 is the positive electrode of the electrode assembly 24, then the second electrode tab 243 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer.

[0188] The first electrode terminal 22 serves to output or input electrical energy from the battery cell 20 , and can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0189] Exemplarily, the first electrode terminal 22 is installed on the wall portion 211 in an insulated manner, that is, no electrical connection is formed between the first electrode terminal 22 and the wall portion 211 .

[0190] In Figures 3 and 4 , the battery cell 20 may further include a second electrode terminal 25, which is insulated and mounted 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 and negative electrodes of the battery cell 20, so that the first electrode terminal 22 and the second electrode terminal 25 cooperate to input or output electrical energy to or from the battery cell 20. Correspondingly, the battery cell 20 includes a first current collecting member 23 and a second current collecting member 26. The first tabs 242 of the plurality of electrode assemblies 24 are connected to the first electrode terminal 22 via the first current collecting member 23, and the second tabs 243 of the plurality of electrode assemblies 24 are connected to the second electrode terminal 25 via the second current collecting member 26, thereby enabling the input or output of electrical energy to or from the battery cell 20.

[0191] Exemplarily, the second electrode terminal 25 may be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0192] It should be noted that when the first electrode terminal 22 is insulated and mounted on the wall portion 211, the second electrode terminal 25 can be insulated and mounted on the wall portion 211, or it can be directly mounted on the wall portion 211, so that the second electrode terminal 25 is electrically connected to the wall portion 211. In this case, the wall portion 211 and the second electrode terminal 25 have the same charge. Similarly, when the second electrode terminal 25 is insulated and mounted on the wall portion 211, the first electrode terminal 22 can be insulated and mounted on the wall portion 211, or it can be directly mounted on the wall portion 211, so that the first electrode terminal 22 is electrically connected to the wall portion 211. In this case, the wall portion 211 and the second electrode terminal 25 have the same charge.

[0193] The structures for installing the first electrode terminal 22 and the second electrode terminal 25 on the outer shell 21 can be various. For example, in Figure 3, 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 a shell 212 and two end covers 213. The opposite ends of the shell 212 have openings 2121. The two end covers 213 respectively cover the openings 2121 at both ends of the shell 212. 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.

[0194] The first current collecting member 23 connects the first electrode terminal 22 to the first tab 242 of the plurality of electrode assemblies 24. The first current collecting member 23 can be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the second current collecting member 26 connects the second electrode terminal 25 to the second tab 243 of the plurality of electrode assemblies 24. The second current collecting member 26 can also be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0195] 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.

[0196] Optionally, the pressure relief mechanism may be provided on the end cover 213 of the housing 21, or may be provided 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. 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.

[0197] A plurality of electrode assemblies 24 are stacked in a first direction X in the outer shell 21 of the battery cell 20. The first tabs 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 tabs 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 electrical 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 electrical capacity of the battery cell 20. The battery cell 20 adopting this structure It is only necessary to stack multiple electrode assemblies 24 in the outer shell 21 and connect the first pole ears 242 of the multiple electrode assemblies 24 through a first current collecting component 23 to realize the input or output of electrical energy of a large-capacity battery cell 20. There is no need to set multiple first current collecting components 23 in the outer shell 21 to connect the first pole ears 242 of the multiple 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.

[0198] According to some embodiments of the present application, referring to Figures 4, 5 and 6, along the second direction Y, at least a portion of the first current collecting member 23 is located on a side of the main body 241 where the first electrode tab 242 is provided, and a portion of the first electrode tab 242 is located on a side of the first current collecting member 23 away from the main body 241 and is connected to the first current collecting member 23.

[0199] Specifically, at least a portion of the first current collecting member 23 is located on the side of the main body 241 where the first electrode 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 electrode tab 242 is provided, or only partially located on the side of the main body 241 where the first electrode tab 242 is provided. Of course, in the structure where at least a portion of the first current collecting member 23 is located on the side of the main body 241 where the first electrode tab 242 is provided, the first current collecting member 23 may be located inside or outside the housing 21.

[0200] The first electrode tab 242 is located on a side of the first current collecting member 23 facing away from the main body 241 and is connected to the first current collecting member 23. Specifically, the first electrode tab 242 is connected to the side of the first current collecting member 23 facing away from the main body 241. Alternatively, various structures may be employed in which the first electrode tab 242 is located on the side of the first current collecting member 23 facing away from the main body 241 and is connected to the first current collecting member 23. For example, the first electrode tab 242 may extend from the side of the first current collecting member 23 facing the main body 241, around the edge of the first current collecting member 23, and then connect to the side of the first current collecting member 23 facing away from the main body 241. Alternatively, a passage for the first electrode tab 242 to pass through the first current collecting member 23 may be provided in the first current collecting member 23, such that the first electrode tab 242 passes through the first current collecting member 23 and then connects to the side of the first current collecting member 23 facing away from the main body 241.

[0201] By arranging at least a portion of the first current collecting member 23 to be located on the side of the main body 241 where the first electrode tab 242 is provided, it is convenient to connect the first current collecting member 23 with the first electrode tab 242, which helps to reduce the difficulty of assembling the first current collecting member 23 and the first electrode tab 242. Specifically, by arranging a portion of the first electrode tab 242 to be located on the side of the first current collecting member 23 away from the main body 241 in the second direction Y, and connecting the portion to the first current collecting member 23, the first electrode tab 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 electrode tab 242 to the first current collecting member 23. On the other hand, it can reduce the phenomenon of the first current collecting member 23 pressing the first electrode tab 242 downward toward the side closer to the main body 241, thereby reducing the risk of short circuit caused by the first electrode tab 242 being inserted upside down into the main body 241.

[0202] According to some embodiments of the present application, referring to Figures 4 and 6, and further referring to Figure 7, Figure 7 is a schematic structural diagram 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, which extends through the first current collecting member 23 along the second direction Y. The first electrode tab 242 passes through the first avoidance area 231 and is connected to the side of the first current collecting member 23 that is away from the main body 241.

[0203] 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.

[0204] Optionally, the structure of the first avoidance area 231 provided on the first current collecting member 23 can be of various types. It can be that only one first avoidance area 231 is provided on the first current collecting member 23, so that the first pole tabs 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. It can also be that the first pole tab 242 of each electrode assembly 24 on the first current collecting member 23 is provided with a first avoidance area 231. It can also be that multiple first avoidance areas 231 are provided on the first current collecting member 23, and each first avoidance area 231 can allow the first pole tab 242 of one electrode assembly 24 or the first pole tabs 242 of multiple electrode assemblies 24 to pass through.

[0205] Exemplarily, a row of first avoidance areas 231 is provided on the first current collecting member 23 corresponding to the first electrode tabs 242 of the multiple 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. The first electrode tabs 242 of two adjacent electrode assemblies 24 among the multiple electrode assemblies 24 pass through the first current collecting member 23 through a first avoidance area 231 and are connected to the side of the first current collecting member 23 facing away from the main body 241.

[0206] By providing a 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 lug 242 can pass through the first avoidance area 231 and 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 facilitates the first pole lug 242 to be set as a structure 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 lug 242 bypassing the first current collecting member 23 and optimize the length of the first pole lug 242 bypassing the first current collecting member 23, thereby alleviating the redundancy of the first pole lug 242 and reducing the manufacturing cost of the battery cell 20.

[0207] In some embodiments, as shown in FIG7 , 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 may also have other structures. For example, referring to FIG8 , FIG8 is a schematic structural diagram of the first current collecting member 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 provided on the edge of the first current collecting member 23. In other words, the first avoidance area 231 is a notch provided on the surface of the edge of the first current collecting member 23 in the third direction Z, and the notch extends through both sides of the first current collecting member 23 along the second direction Y.

[0208] The first direction X, the second direction Y and the third direction Z are not coplanar and intersect with each other. For example, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0209] The first avoidance area 231 can be a through hole set on the first current collecting member 23 or a notch set at the edge of the first current collecting member 23, so that the first electrode tab 242 can pass through the first avoidance area 231 and connect to the side of the first current collecting member 23 away from the main body 241. The structure is simple and easy to manufacture.

[0210] In some embodiments, as shown in FIG. 3 and FIG. 4 , 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 .

[0211] 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 and the first electrode terminal 22 electrically connected to each other through the first current collecting member 23, thereby improving the production efficiency of the battery cell 20. In addition, the outer shell 21 can provide a certain degree of protection for the first current collecting member 23, thereby reducing the wear or damage of the first current collecting member 23 during use.

[0212] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, along the second direction Y, a first channel for each first pole lug 242 to extend is provided on the side of the shell 21 close to the first pole lug 242, and each first pole lug 242 can extend out of the shell 21 through the corresponding first channel. The first current collecting component 23 is provided on the outside of the shell 21, and the first current collecting component 23 is electrically connected to the extended first pole lug 242.

[0213] Among them, along the second direction Y, a first channel for each first electrode tab 242 to extend out is provided on the side of the shell 21 close to the first electrode tab 242, that is, the area of ​​the shell 21 facing the side of the main body 241 on which the first electrode tab 242 is provided in the second direction Y is provided with a first channel for the first electrode tab 242 to pass through, so that the first electrode tabs 242 of the multiple 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.

[0214] For example, the housing 21 may be provided with a plurality of first apertures, each corresponding to a first electrode tab 242, so that the first electrode tab 242 of each electrode assembly 24 can extend out of the housing 21 through a first aperture, which helps to reduce interference between the first electrode tabs 242 of the plurality of electrode assemblies 24. Of course, in other embodiments, the housing 21 may be provided with only one first aperture, and the first electrode tabs 242 of the plurality of electrode assemblies 24 may extend out of the housing 21 through the same first aperture.

[0215] By arranging the first current collecting member 23 on the outside of 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 member 23 after passing through the shell 21. The battery cell 20 adopting this structure is convenient for later inspection of the first current collecting member 23, and is convenient for maintenance and replacement of the first current collecting member 23, which is beneficial to reducing the maintenance cost of the battery cell 20.

[0216] According to some embodiments of the present application, as shown in Figures 3, 4, 5, and 6, the electrode assembly 24 further includes a second electrode tab 243. The second electrode tab 243 is disposed at one end of the main body 241 along the second direction Y. The second electrode tabs 243 of multiple electrode assemblies 24 are located at the same end of the main body 241, and the polarity of the second electrode tab 243 is opposite to that of the first electrode 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 electrode tab 243.

[0217] 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 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 multiple electrode assemblies 24, multiple second pole ears 243 are all located at the same end of the corresponding main body 241.

[0218] 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 the positive electrode and the negative electrode of the electrode assembly 24 , respectively.

[0219] Exemplarily, the second electrode terminal 25 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 .

[0220] It should be noted that the first electrode tab 242 and the second electrode tab 243 may be disposed at the same end of the main body 241 in the second direction Y, or may be disposed at both ends of the main body 241 in the second direction Y. For example, in FIG4 , 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.

[0221] The electrode assembly 24 is also provided with a second electrode tab 243 having a polarity opposite to that of the first electrode tab 242. The second electrode tabs 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 electrode tabs 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 electrical energy of the battery cell 20. The battery cell 20 adopting this structure only needs to stack multiple electrode assemblies 24 in the outer shell 21 and connect the second electrode tabs 243 of the plurality of electrode assemblies 24 through a second current collecting member 26 to realize the input or output of electrical energy of the large-capacity battery cell 20. There is no need to set multiple second current collecting members 26 in the outer shell 21 to connect the second electrode tabs 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, 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.

[0222] According to some embodiments of the present application, referring to Figures 4, 5 and 6, along the second direction Y, at least a portion of the second current collecting member 26 is located on a side of the main body 241 where the second pole tab 243 is provided, and a portion of the second pole tab 243 is located on a side of the second current collecting member 26 away from the main body 241 and is connected to the second current collecting member 26.

[0223] Among them, at least a portion of the second current collecting member 26 is located on the side of the main body 241 where the second electrode 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 electrode tab 243 is provided, or only partially located on the side of the main body 241 where the second electrode tab 243 is provided. Of course, in the structure where at least a portion of the second current collecting member 26 is located on the side of the main body 241 where the second electrode tab 243 is provided, the second current collecting member 26 may be located inside or outside the housing 21.

[0224] The second electrode tab 243 is located on a side of the second current collecting member 26 facing away from the main body 241 and is connected to the second current collecting member 26. Specifically, the second electrode tab 243 is connected to the side of the second current collecting member 26 facing away from the main body 241. Alternatively, various structures may be employed in which the second electrode tab 243 is located on the side of the second current collecting member 26 facing away from the main body 241 and is connected to the second current collecting member 26. For example, the second electrode tab 243 may extend from the side of the second current collecting member 26 facing the main body 241, around the edge of the second current collecting member 26, and then be connected to the side of the second current collecting member 26 facing away from the main body 241. Alternatively, the second current collecting member 26 may be provided with a passage for the second electrode tab 243 to pass through, allowing the second electrode tab 243 to pass through the second current collecting member 26 and then be connected to the side of the second current collecting member 26 facing away from the main body 241.

[0225] By arranging 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 tab 243 is provided, it is convenient to connect the second current collecting member 26 to the second pole tab 243, which helps to reduce the difficulty of assembling the second current collecting member 26 and the second pole tab 243. Specifically, by arranging a portion of the second pole tab 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 connecting this portion to the second current collecting member 26, the second pole tab 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 tab 243 to the second current collecting member 26. On the other hand, it can reduce the phenomenon of the second current collecting member 26 pressing the second pole tab 243 downward in the direction close to the main body 241, thereby reducing the risk of short circuit caused by the second pole tab 243 being inserted upside down into the main body 241.

[0226] According to some embodiments of the present application, referring to Figures 4 and 6, and further referring to Figure 9, which is a schematic structural diagram 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 escape area 261, which extends through the second current collecting member 26 along the second direction Y. The second electrode tab 243 passes through the second escape area 261 and is connected to the side of the second current collecting member 26 facing away from the main body 241.

[0227] 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.

[0228] Optionally, the structure of the second avoidance area 261 provided on the second current collecting member 26 can be various. It can be that only one second avoidance area 261 is provided on the second current collecting member 26, so that the second pole tabs 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. It can also be that the second pole tab 243 of each electrode assembly 24 on the second current collecting member 26 is provided with a second avoidance area 261. It can also be that multiple second avoidance areas 261 are provided on the second current collecting member 26, and each second avoidance area 261 can allow the second pole tab 243 of one electrode assembly 24 or the second pole tabs 243 of multiple electrode assemblies 24 to pass through.

[0229] Illustratively, a row of second avoidance areas 261 is provided on the second current collecting member 26 corresponding to the second pole tabs 243 of the multiple 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. The second pole tabs 243 of two adjacent electrode assemblies 24 among the multiple 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 facing away from the main body 241.

[0230] By providing 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 lug 243 can pass through the second avoidance area 261 and 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 facilitates setting the second pole lug 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 lug 243 bypassing the second current collecting member 26 and optimize the length of the second pole lug 243 bypassing the second current collecting member 26, thereby alleviating the redundancy of the second pole lug 243 and reducing the manufacturing cost of the battery cell 20.

[0231] In some embodiments, as shown in FIG9 , 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 may 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 passes through both sides of the second current collecting member 26 along the second direction Y.

[0232] 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.

[0233] In some embodiments, as shown in FIG. 3 and FIG. 4 , 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 .

[0234] 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 the second electrode terminal 25 electrically connected to each other through the second current collecting member 26, thereby improving 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, thereby reducing the wear or damage of the second current collecting member 26 during use.

[0235] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, along the second direction Y, a second channel for each second pole lug 243 to extend is provided on the side of the shell 21 close to the second pole lug 243, and each second pole lug 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 lug 243.

[0236] Among them, along the second direction Y, a second channel for each second pole ear 243 to extend out is provided on the side of the shell 21 close to the second pole ear 243, that is, the area of ​​the shell 21 facing the side of the main body 241 on which the second pole ear 243 is provided 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 multiple electrode assemblies 24 can extend out of the outside 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.

[0237] For example, the housing 21 may be provided with a plurality of second apertures, each corresponding to a second electrode tab 243, so that the second electrode tab 243 of each electrode assembly 24 can extend out of the housing 21 through a second aperture, which helps reduce interference between the second electrode tabs 243 of the plurality of electrode assemblies 24. Of course, in other embodiments, the housing 21 may be provided with only one second aperture, and the second electrode tabs 243 of the plurality of electrode assemblies 24 may extend out of the housing 21 through the same second aperture.

[0238] By arranging the second current collecting member 26 on the outside of the shell 21 and providing a second hole on the 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 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.

[0239] According to some embodiments of the present application, as shown in Figures 4, 5, and 6, 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 tab 242 and the second electrode tab 243 are spaced apart along the third direction Z. The first direction X, the second direction Y, and the third direction Z are not coplanar and intersect with each other. The first current collecting member 23 includes a first connecting portion 232 electrically connecting each first electrode tab 242, and the second current collecting member 26 includes a second connecting portion 262 electrically connecting each second electrode tab 243. The first connecting portion 232 and the second connecting portion 262 are both located on the side of the main body 241 along the second direction Y where the first electrode tab 242 and the second electrode tab 243 are disposed, and the first connecting portion 232 and the second connecting portion 262 are spaced apart along the third direction Z.

[0240] The first direction X, the second direction Y, and the third direction Z are non-coplanar and intersect each other, that is, the first direction X, the second direction Y, and the third direction Z intersect each other, and each 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.

[0241] The first current collecting member 23 includes a first connecting portion 232. The first connecting portion 232 is located on the side of the main body 241 in the second direction Y where the first electrode tab 242 is provided. The first connecting portion 232 serves to connect the first electrode tabs 242 of the plurality of electrode assemblies 24. Similarly, the second current collecting member 26 includes a second connecting portion 262. The second connecting portion 262 is located on the side of the main body 241 in the second direction Y where the second electrode tab 243 is provided. The second connecting portion 262 serves to connect the second electrode tabs 243 of the plurality of electrode assemblies 24.

[0242] The first connecting portion 232 serves to connect the first tabs 242 of the plurality of electrode assemblies 24. The connection structure between the first connecting portion 232 and the first tab 242 can be various, such as welding, abutting, or bolting. Similarly, the second connecting portion 262 serves to connect the second tabs 243 of the plurality of electrode assemblies 24. The connection structure between the second connecting portion 262 and the second tab 243 can be various, such as welding, abutting, or bolting.

[0243] Optionally, in an embodiment where the first electrode tab 242 and the second electrode tab 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 electrode tab 242 and the second electrode tab 243 are provided in the second direction Y, or it can be arranged on one side of the multiple electrode assemblies 24 in the first direction X.

[0244] For example, in FIG4 , the wall portion 211 is located on the side of the main body 241 on which the first electrode tab 242 and the second electrode tab 243 are provided in the second direction Y. Correspondingly, the first current collecting member 23 and the second current collecting member 26 are both entirely provided on the side of the main body 241 on which the first electrode tab 242 and the second electrode tab 243 are provided. That is, in this embodiment, the first current collecting member 23 includes only the first connecting portion 232, and the first connecting portion 232 connects the first electrode tab 242 and the first electrode terminal 22. Similarly, the second current collecting member 26 includes only the second connecting portion 262, and the second connecting portion 262 connects the second electrode tab 243 and the second electrode terminal 25.

[0245] 4 , the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21, such 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 portion 211. Of course, in an 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 a side of the wall portion 211 facing away from the main body 241.

[0246] In some embodiments, referring to Figures 10 and 11, Figure 10 is a schematic structural diagram of a battery cell 20 provided in some other embodiments of the present application, and Figure 11 is an exploded structural diagram of a 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 connecting portion 232 is the portion of the first current collecting member 23 located on the side of the main body 241 provided with the first electrode tab 242 in the second direction Y and connected to the first electrode tab 242. The second connecting portion 262 is the portion of the second current collecting member 26 located on the side of the main body 241 provided with the second electrode tab 243 in the second direction Y and connected to the second electrode tab 243.

[0247] It should be noted that in the embodiment where 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 extends along the second direction Y through both sides of the first connecting portion 232, so that the first electrode tab 242 passes through the first avoidance area 231 and connects to the side of the first connecting portion 232 facing away from the main portion 241. Similarly, in the embodiment where 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 extends along the second direction Y through both sides of the second connecting portion 262, so that the second electrode tab 243 passes through the second avoidance area 261 and connects to the side of the second connecting portion 262 facing away from the main portion 241.

[0248] By arranging the first electrode tab 242 and the second electrode tab 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 electrode tab 242 and the second electrode tab 243 are arranged, on the one hand, it is convenient to connect the first current collecting member 23 with the first electrode tab 242, and to connect the second current collecting member 26 with the second electrode tab 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, it enables the first current collecting member 23 and the second current collecting member 26 to 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 of the battery cell 20 and improving the energy density of the battery cell 20.

[0249] According to some embodiments of the present application, as shown in Figures 4 and 11, 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 further include a first insulating member 27. The first insulating member 27 is arranged along the second direction Y on the side of the first connection portion 232 and the second connection portion 262 away from the main body portion 241 to insulate and isolate the first connection portion 232 and the outer shell 21 and the second connection portion 262 and the outer shell 21.

[0250] Among them, the first insulating part 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 part 241, that is, in the second direction Y, the first connection part 232 of the first current collecting component 23 and the second connection part 262 of the second current collecting component 26 are located between the main body part 241 and the first insulating part 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 part 27.

[0251] Exemplarily, the first insulating member 27 can be made of various materials, such as rubber, silicone, or plastic.

[0252] 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 connecting portion 232 and the second connecting portion 262 away from the main body 241, so that the first insulating member 27 is located between the first connecting portion 232 and the second connecting portion 262 and the outer shell 21 in the second direction Y. The battery cell 20 adopting this structure can, on the one hand, 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 reducing the risk of short circuit 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 achieve that 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 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.

[0253] According to some embodiments of the present application, please continue to refer to Figures 4 and 11, 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 further include a second insulating member 28, which is arranged between the first connecting portion 232 and the second connecting portion 262 and the main body 241 along the second direction Y to insulate and isolate the first connecting portion 232 and the main body 241 and the second connecting portion 262 and the main body 241.

[0254] In which, 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.

[0255] For example, the second insulating member 28 can be made of various materials, such as rubber, silicone, or plastic.

[0256] 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 connecting portion 232 and the second connecting portion 262 facing the main body 241, so that the second insulating member 28 is located between the first connecting portion 232 and the second connecting portion 262 and the main body 241 in the second direction Y. The battery cell 20 adopting this structure can, on the one hand, 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 reducing the risk of short circuit 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 achieve that 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 share a second insulating member 28, which is beneficial to optimizing the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0257] According to some embodiments of the present application, as shown in Figures 3 and 4, along the second direction Y, the wall portion 211 is located on one side of the multiple electrode assemblies 24, the first electrode tab 242 and the second electrode tab 243 are both arranged 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 arranged on one side of the main body 241 facing the wall portion 211.

[0258] 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.

[0259] 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 portion 211, that is, the first current collecting member 23 and the wall portion 211 are arranged along the second direction Y at the end of the main body 241 where the first electrode tab 242 is provided, and the second current collecting member 26 and the wall portion 211 are also arranged along the second direction Y at the end of the main body 241 where the second electrode tab 243 is provided.

[0260] 4 , 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 portion 211 in the second direction Y. Of course, in an 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 a side of the wall portion 211 facing away from the main body 241 , such that the wall portion 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.

[0261] The wall portion 211 is located on the side of the plurality of electrode assemblies 24 on which the first electrode tab 242 and the second electrode tab 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 electrode tab 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 electrode tab 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 can 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.

[0262] In some embodiments, as shown in FIG. 4 , FIG. 6 and FIG. 7 , 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 .

[0263] Exemplarily, the first current collecting member 23 is disposed inside the housing 21, and correspondingly, the first protrusion 234 is protruding from the side of the first current collecting member 23 facing away from the main body 241. Of course, in an 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 facing away from the main body 241, and the first protrusion 234 is protruding from the side of the first current collecting member 23 facing the main body 241.

[0264] Illustratively, the first current collecting member 23 is welded to the first electrode terminal 22 via the first protrusion 234 .

[0265] 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 adopting this structure can reduce the difficulty of assembling the first current collecting member 23 and the first electrode terminal 22, and the structure of the first protrusion 234 and the first electrode terminal 22 being interconnected can improve the connection reliability between the first current collecting member 23 and the first electrode terminal 22.

[0266] In some embodiments, as shown in FIG. 4 , FIG. 6 and FIG. 9 , 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 .

[0267] Exemplarily, the second current collecting member 26 is disposed inside the housing 21, and correspondingly, the second protrusion 264 is protruding from the side of the second current collecting member 26 facing away from the main body 241. Of course, in an 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 facing away from the main body 241, and the second protrusion 264 is protruding from the side of the second current collecting member 26 facing the main body 241.

[0268] Illustratively, the second current collecting member 26 is welded to the second electrode terminal 25 via the second protrusion 264 .

[0269] 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 this structure can reduce the difficulty of assembling the second current collecting member 26 and the second electrode terminal 25, and the structure of the second protrusion 264 and the second electrode terminal 25 being interconnected can improve the connection reliability between the second current collecting member 26 and the second electrode terminal 25.

[0270] According to some embodiments of the present application, referring to Figures 10 and 11, and further referring to Figures 12, 13, and 14, Figure 12 is a schematic diagram of the assembly of the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 provided in further embodiments of the present application, Figure 13 is a schematic diagram of the structure of the first current collecting member 23 of the battery cell 20 provided in further embodiments of the present application, and Figure 14 is a schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided in further 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 connecting portion 233 connected to the first connecting portion 232. The third connecting portion 233 is located on the side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X. The third connecting 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 a side of the plurality of electrode assemblies 24 facing the wall portion 211 in the first direction X. The fourth connection portion 263 is connected to the second electrode terminal 25 .

[0271] In which, 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.

[0272] For example, in Figures 10 and 11, 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 mounted 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.

[0273] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, referring to Figures 15 and 16, Figure 15 is a schematic structural diagram of the battery cell 20 in other embodiments provided in some embodiments of the present application, and Figure 16 is an exploded structural diagram of the battery cell 20 in other embodiments provided in some embodiments of the present application. The battery cell 20 may also be provided with two walls 211, the two walls 211 being located on either 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 being mounted on the two walls 211, such that the first electrode terminal 22 and the second electrode terminal 25 are located on either side of the plurality of electrode assemblies 24 in the first direction X. 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 located on either side of the plurality of electrode assemblies 24 in the first direction X.

[0274] The third connection portion 233 is located on a 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. For example, in FIG11 , the first current collecting member 23 is disposed inside the housing 21. Accordingly, 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 embodiments 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 facing away from the plurality of electrode assemblies 24 in the first direction X.

[0275] The fourth connection portion 263 is located on a 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. For example, in FIG11 , the second current collecting member 26 is disposed inside the housing 21. Accordingly, 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 embodiments 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 facing away from the plurality of electrode assemblies 24 in the first direction X.

[0276] 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.

[0277] The wall portion 211 of the shell 21 is located on at least one side of the multiple electrode assemblies 24 in the first direction X, so that the wall portion 211 and the multiple electrode assemblies 24 are arranged in the same direction, and the first current collecting member 23 has a third connecting portion 233 located on the side of the multiple electrode assemblies 24 facing the wall portion 211 in the first direction X. The third connecting portion 233 and the first connecting portion 232 are connected to each other. By connecting the third connecting portion 233 to the first electrode terminal 22 provided on the wall portion 211 and connecting the first connecting portion 232 to the first pole tabs 242 of the multiple electrode assemblies 24, the first pole tab 242 is electrically connected to the first electrode terminal 22 through the first current collecting member 23. The battery cell 20 with this structure can, on the one hand, separate the area where the first electrode terminal 22 is provided on the shell 21 and the area where the first pole tab 242 is provided on the main body 241, so that the side of the main body 241 where the first pole tab 242 is provided faces The first electrode terminal 22 is not provided in the area of ​​the shell 21, which facilitates the stacking of multiple battery cells 20 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 electrode terminal 22 are separated from each other, which is beneficial to reducing the difficulty of assembling the first current collecting member 23, the first electrode terminal 22 and the first electrode tab 242, and the interference between the first electrode terminal 22 and the first electrode tab 242. In particular, when the first electrode terminal 22 and the first electrode 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 electrode tab 242 and the first current collecting member 23 can be effectively reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal 22 and the first electrode 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. By connecting the fourth connecting portion 263 to the second electrode terminal 25 provided on the wall portion 211 and connecting the second connecting portion 262 to the second pole tabs 243 of the plurality of electrode assemblies 24, 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 adopting this structure can, on the one hand, separate the area of ​​the 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 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. Stacking in the Y direction can, on the other hand, separate the connection area between the second current collecting member 26 and the second electrode terminal 25 and the connection area between the second current collecting member 26 and the second electrode tab 243, which is beneficial to reducing the difficulty of assembling the second current collecting member 26, the second electrode terminal 25 and the second electrode tab 243, and can reduce the interference between the second electrode terminal 25 and the second electrode tab 243, especially when the second electrode terminal 25 and the second electrode tab 243 are both welded to the second current collecting member 26, which 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 electrode tab 243 and the second current collecting member 26, thereby helping to improve the assembly quality and stability of the second electrode terminal 25 and the second electrode tab 243 connected to the second current collecting member 26.

[0278] In some embodiments, as shown in FIG. 11 , FIG. 12 and FIG. 13 , along the first direction X, a first protrusion 234 is provided on a 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 .

[0279] Exemplarily, the first current collecting member 23 is disposed inside the outer shell 21, and correspondingly, the first protrusion 234 is protruding from the side of the third connection portion 233 of the first current collecting member 23 facing away from the plurality of electrode assemblies 24. Of course, in an embodiment where the first current collecting member 23 is disposed 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 facing away from the plurality of electrode assemblies 24, and the first protrusion 234 is protruding from the side of the third connection portion 233 of the first current collecting member 23 facing the plurality of electrode assemblies 24.

[0280] 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 .

[0281] 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 this 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 of the first protrusion 234 and the first electrode terminal 22 being interconnected can improve the connection reliability between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22.

[0282] In some embodiments, as shown in FIG. 11 , FIG. 12 and FIG. 14 , 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 .

[0283] Exemplarily, the second current collecting member 26 is disposed inside the outer shell 21, and correspondingly, the second protrusion 264 is protruding from the side of the fourth connection portion 263 of the second current collecting member 26 facing away from the plurality of electrode assemblies 24. Of course, in an embodiment where the second current collecting member 26 is disposed outside the outer shell 21, the fourth connection portion 263 of the second current collecting member 26 is located on the side of the wall portion 211 facing away from the plurality of electrode assemblies 24, and the second protrusion 264 is protruding from the side of the fourth connection portion 263 of the second current collecting member 26 facing the plurality of electrode assemblies 24.

[0284] 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 .

[0285] The fourth connection portion 263 of the second current collecting member 26 is provided with a second protrusion 264 on the 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 of the second protrusion 264 and the second electrode terminal 25 being 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.

[0286] According to some embodiments of the present application, referring to Figures 10 and 11 , 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.

[0287] In which, 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.

[0288] 10 and 11 , the first current collecting member 23 and the second current collecting member 26 are both disposed inside the housing 21. Accordingly, 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 embodiments 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 a side of the wall portion 211 facing away from the plurality of electrode assemblies 24 in the first direction X.

[0289] 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 mounted 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. This facilitates connection between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22, and between the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25. Furthermore, the battery cell 20 has a structure in which the first electrode terminal 22 and the second electrode terminal 25 are protruding from the same end in the first direction X, and the third connection portion 233 and the fourth connection portion 263 can share space in the first direction X, thereby improving space utilization of the battery cell 20 and thereby increasing the energy density of the battery cell 20.

[0290] According to some embodiments of the present application, as shown in Figure 11, 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 further include a third insulating member 29, which is arranged between the third connecting part 233 and the fourth connecting part 263 and the multiple electrode assemblies 24 along the first direction X to insulate and isolate the third connecting part 233 and the electrode assembly 24 and the fourth connecting part 263 and the electrode assembly 24.

[0291] 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.

[0292] Exemplarily, the third insulating member 29 can be made of various materials, such as rubber, plastic, or silicone.

[0293] 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, achieve 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 reducing the risk of short circuit. On the other hand, it can achieve 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 sharing a third insulating member 29, which is beneficial to optimizing the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0294] In some embodiments, as shown in FIG. 11 , along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the third connecting portion 233 is received in the first slot 31 .

[0295] The first latching groove 31 is provided 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 latched in the first latching groove 31 .

[0296] 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.

[0297] 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 connection 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 connection portion 233 and the multiple electrode assemblies 24, and the third insulating member 29 and the third connection portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0298] In some embodiments, please continue to refer to FIG. 11 , along the first direction X, a second slot 32 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0299] The second slot 32 is provided 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 locked in the second slot 32 .

[0300] 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.

[0301] It should be noted that in an embodiment 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 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.

[0302] By providing a second card 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 card slot 32, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion 263 and the multiple 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.

[0303] According to some embodiments of the present application, as shown in Figures 15 and 16, along a first direction X, the housing 21 has two walls 211 disposed opposite each other. The two walls 211 are located on either side of the plurality of electrode assemblies 24, and the first electrode terminal 22 and the second electrode terminal 25 are disposed on the two walls 211. The third connection portion 233 is located on a side of the plurality of electrode assemblies 24 facing the first electrode terminal 22, and the fourth connection portion 263 is located on a side of the plurality of electrode assemblies 24 facing the second electrode terminal 25.

[0304] 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 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.

[0305] For example, in Figures 15 and 16, 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 multiple 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 multiple electrode assemblies 24 in the first direction X. Of course, in the embodiment where both the first current collecting member 23 and the second current collecting member 26 are 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, 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.

[0306] 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. On the other hand, 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 can be kept away from each other, which is conducive to alleviating the interference 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, thereby improving the reliability of the battery cell 20.

[0307] According to some embodiments of the present application, as shown in Figure 16, 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 further include a third insulating member 29 and a fourth insulating member 30. 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. 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. 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.

[0308] 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, such 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 on which the first electrode terminal 22 is disposed in the first direction X, thereby positioning the third insulating member 29 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 on which the second electrode terminal 25 is disposed in the first direction X, thereby positioning the fourth insulating member 30 between the fourth connection portion 263 and the plurality of electrode assemblies 24.

[0309] For example, the third insulating member 29 can be made of various materials, such as rubber, plastic, or silicone, etc. Similarly, the fourth insulating member 30 can also be made of various materials, such as rubber, plastic, or silicone, etc.

[0310] 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.

[0311] In some embodiments, as shown in FIG. 16 , along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0312] The first locking groove 31 is provided 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 provided, so that the third connection portion 233 of the first current collecting member 23 can be locked in the first locking groove 31 .

[0313] 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.

[0314] 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 connection 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 connection portion 233 and the multiple electrode assemblies 24, and the third insulating member 29 and the third connection portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0315] In some embodiments, please continue to refer to FIG. 16 , along the first direction X, a second slot 32 is provided on a side of the fourth insulating member 30 facing away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0316] The second locking groove 32 is provided on one side of the fourth insulating member 30 facing the wall portion 211 where the second electrode terminal 25 is provided in the first direction X, so that the fourth connecting portion 263 of the second current collecting member 26 can be locked in the second locking groove 32 .

[0317] 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.

[0318] 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 multiple 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.

[0319] According to some embodiments of the present application, with reference to Figures 17, 18, 19, 20, and 21, Figure 17 is a schematic structural diagram of a battery cell 20 provided in still further embodiments of the present application, Figure 18 is an exploded structural diagram of a battery cell 20 provided in still further embodiments of the present application, Figure 19 is a schematic assembly diagram of a first current collecting member 23 and an electrode assembly 24 of a battery cell 20 provided in still further embodiments of the present application, Figure 20 is a schematic structural diagram of a first current collecting member 23 of a battery cell 20 provided in still further embodiments of the present application, and Figure 21 is a schematic structural diagram of a second current collecting member 26 of a battery cell 20 provided in still further embodiments of the present application. Along the second direction Y, a first electrode tab 242 and a second electrode tab 243 are respectively disposed at both ends of the main body 241. The first current collecting member 23 includes a first connecting portion 232 electrically connecting each first electrode tab 242, and the first connecting portion 232 is located on one side of the main body 241 where the first electrode tab 242 is provided in the second direction Y. The second current collecting member 26 includes a second connecting portion 262 electrically connecting each second electrode tab 243, and the second connecting portion 262 is located on one side of the main body 241 where the second electrode tab 243 is provided in the second direction Y.

[0320] The first current collecting member 23 includes a first connecting portion 232, which is located on the side of the main body 241 in the second direction Y where the first electrode tab 242 is located. The first connecting portion 232 serves to connect the first electrode tabs 242 of the plurality of electrode assemblies 24. Similarly, the second current collecting member 26 includes a second connecting portion 262, which is located on the side of the main body 241 in the second direction Y where the second electrode tab 243 is located. The second connecting portion 262 serves to connect the second electrode tabs 243 of the plurality of electrode assemblies 24. Because the first electrode tab 242 and the second electrode tab 243 are respectively located at opposite ends of the main body 241 in the second direction Y, 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 respectively located at opposite ends of the main body 241 in the second direction Y.

[0321] For example, in Figure 18, 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 on which the first pole ear 242 is provided 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 on which the second pole ear 243 is provided 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.

[0322] It should be noted that in embodiments where the first electrode tab 242 and the second electrode 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. For example, in Figures 17 and 18, 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. Referring to Figure 22, which is an exploded view of the structure 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 being 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 being mounted on the two wall portions 211, respectively. In other embodiments, the battery cell 20 may also be two wall portions 211 located on both sides of the multiple 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 component 23 may be located as a whole on the side of the main body 241 where the first pole tab 242 is provided in the second direction Y, and the second current collecting component 26 may be located as a whole on the side of the main body 241 where the second pole tab 243 is provided in the second direction Y.

[0323] By respectively arranging the first electrode tab 242 and the second electrode 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 both 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 electrode tab 242 and the second electrode 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, it can make the first electrode tab 242 and the second electrode tab 243 with opposite polarities stay away from each other, and can make 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 stay away from each other, which is conducive to reducing the risk of short circuit between the first electrode tab 242 and the second electrode tab 243 and between the first current collecting member 23 and the second current collecting member 26, thereby improving the reliability of the battery cell 20.

[0324] According to some embodiments of the present application, referring to Figures 18 and 22, 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 further 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 connecting portion 232 away from the main body 241 to insulate and isolate the first connecting portion 232 and the outer shell 21, and the other first insulating member 27 is located on the side of the second connecting portion 262 away from the main body 241 to insulate and isolate the second connecting portion 262 and the outer shell 21.

[0325] 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.

[0326] Exemplarily, the first insulating member 27 can be made of various materials, such as silicone, rubber, or plastic.

[0327] 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 a 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 and the second current collecting member 26 and the outer shell 21, so as to improve the reliability of the battery cell 20.

[0328] According to some embodiments of the present application, please continue to refer to Figures 18 and 22, 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, and the two second insulating members 28 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.

[0329] 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.

[0330] For example, the second insulating member 28 can be made of various materials, such as plastic, silicone, or rubber.

[0331] 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 part 232 facing the main body 241 and the side of the second connecting part 262 facing the main body 241, so that a second insulating member 28 is provided between the first connecting part 232 and the main body 241 and between the second connecting part 262 and the main body 241, so that the two first insulating members 27 can respectively achieve insulation isolation between the first connecting part 232 and the main body 241 and between the second connecting part 262 and the main body 241, which is beneficial to reduce the risk of short circuit between the first collecting component 23 and the second collecting component 26 and the main body 241, so as to improve the reliability of the battery cell 20.

[0332] According to some embodiments of the present application, as shown in Figures 17, 18, 19, 20, and 21, the wall portion 211 is located on at least one side of the plurality of electrode assemblies 24 along the first direction X. 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. 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. The fourth connection portion 263 is connected to the second electrode terminal 25.

[0333] In which, 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.

[0334] For example, in Figures 18 and 19, 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 mounted 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.

[0335] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, as shown in Figure 22, the battery cell 20 can also be provided with two wall portions 211, and the two wall portions 211 are respectively located on both sides of the multiple 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 multiple electrode assemblies 24 in the first direction X. 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 multiple electrode assemblies 24 in the first direction X.

[0336] Illustratively, 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 electrode assemblies 24 in the first direction X and are located between the wall portion 211 and the electrode assemblies 24 .

[0337] The wall portion 211 of the shell 21 is located on at least one side of the multiple electrode assemblies 24 in the first direction X, so that the wall portion 211 and the multiple electrode assemblies 24 are arranged in the same direction, and the first current collecting member 23 has a third connecting portion 233 located on the side of the multiple electrode assemblies 24 facing the wall portion 211 in the first direction X. The third connecting portion 233 and the first connecting portion 232 are connected to each other. By connecting the third connecting portion 233 to the first electrode terminal 22 provided on the wall portion 211 and connecting the first connecting portion 232 to the first pole tabs 242 of the multiple electrode assemblies 24, the first pole tab 242 is electrically connected to the first electrode terminal 22 through the first current collecting member 23. The battery cell 20 with this structure can, on the one hand, separate the area where the first electrode terminal 22 is provided on the shell 21 and the area where the first pole tab 242 is provided on the main body 241, so that the side of the main body 241 where the first pole tab 242 is provided faces The first electrode terminal 22 is not provided in the area of ​​the shell 21, which facilitates the stacking of multiple battery cells 20 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 electrode terminal 22 are separated from each other, which is beneficial to reducing the difficulty of assembling the first current collecting member 23, the first electrode terminal 22 and the first electrode tab 242, and the interference between the first electrode terminal 22 and the first electrode tab 242. In particular, when the first electrode terminal 22 and the first electrode 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 electrode tab 242 and the first current collecting member 23 can be effectively reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal 22 and the first electrode 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. By connecting the fourth connecting portion 263 to the second electrode terminal 25 provided on the wall portion 211 and connecting the second connecting portion 262 to the second pole tabs 243 of the plurality of electrode assemblies 24, 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 adopting this structure can, on the one hand, separate the area of ​​the 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 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. Stacking in the Y direction can, on the other hand, separate the connection area between the second current collecting member 26 and the second electrode terminal 25 and the connection area between the second current collecting member 26 and the second electrode tab 243, which is beneficial to reducing the difficulty of assembling the second current collecting member 26, the second electrode terminal 25 and the second electrode tab 243, and can reduce the interference between the second electrode terminal 25 and the second electrode tab 243, especially when the second electrode terminal 25 and the second electrode tab 243 are both welded to the second current collecting member 26, which 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 electrode tab 243 and the second current collecting member 26, thereby helping to improve the assembly quality and stability of the second electrode terminal 25 and the second electrode tab 243 connected to the second current collecting member 26.

[0338] In some embodiments, as shown in FIG. 18 , FIG. 19 and FIG. 20 , along the first direction X, a first protrusion 234 is provided on 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 .

[0339] Illustratively, 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 multiple 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.

[0340] 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 this 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 of the first protrusion 234 and the first electrode terminal 22 being interconnected can improve the connection reliability between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22.

[0341] In some embodiments, as shown in FIG. 18 , FIG. 19 and FIG. 21 , along the first direction X, a second protrusion 264 is provided on a 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 .

[0342] Illustratively, 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 multiple 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.

[0343] The fourth connection portion 263 of the second current collecting member 26 is provided with a second protrusion 264 on the 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 of the second protrusion 264 and the second electrode terminal 25 being 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.

[0344] According to some embodiments of the present application, referring to Figures 17, 18 and 19, 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, and the third connection portion 233 and the fourth connection portion 263 are both located on the side of the multiple electrode assemblies 24 facing the first electrode terminal 22 and the second electrode terminal 25.

[0345] In which, 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.

[0346] For example, in FIG. 18 , the first current collecting member 23 and the second current collecting member 26 are both disposed inside the outer shell 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.

[0347] 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 mounted 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, this facilitates connection between the third connection portion 233 of the first current collecting member 23 and the first electrode terminal 22, and facilitates connection between the fourth connection portion 263 of the second current collecting member 26 and the second electrode terminal 25. On the other hand, the battery cell 20 has a structure in which the first electrode terminal 22 and the second electrode terminal 25 are output from the same end in the first direction X, and the third connection portion 233 and the fourth connection portion 263 can share space in the first direction X, thereby improving space utilization of the battery cell 20 and thereby increasing the energy density of the battery cell 20.

[0348] According to some embodiments of the present application, as shown in Figure 18, 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 further include a third insulating member 29, which is arranged between the third connecting part 233 and the fourth connecting part 263 and the multiple electrode assemblies 24 along the first direction X to insulate and isolate the third connecting part 233 and the electrode assembly 24 and the fourth connecting part 263 and the electrode assembly 24.

[0349] 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 on a side of the third insulating member 29 away from the plurality of electrode assemblies 24 .

[0350] Exemplarily, the third insulating member 29 can be made of various materials, such as plastic, rubber, or silicone.

[0351] 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, achieve 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 reducing the risk of short circuit. On the other hand, it can achieve 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 sharing a third insulating member 29, which is beneficial to optimizing the assembly process of the battery cell 20 and can reduce the manufacturing cost of the battery cell 20.

[0352] In some embodiments, as shown in FIG. 18 , along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0353] 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 connection 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 connection portion 233 and the multiple electrode assemblies 24, and the third insulating member 29 and the third connection portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0354] In some embodiments, please continue to refer to FIG. 18 . Along the first direction X, a second slot 32 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the fourth connecting portion 263 is accommodated in the second slot 32 .

[0355] By providing a second card 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 card slot 32, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion 263 and the multiple 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.

[0356] According to some embodiments of the present application, as shown in FIG. 22 , along a first direction X, the housing 21 has two opposing walls 211 . The two walls 211 are located on either side of the plurality of electrode assemblies 24, and the first electrode terminal 22 and the second electrode terminal 25 are disposed on the two walls 211 . The third connection portion 233 is located on a side of the plurality of electrode assemblies 24 facing the first electrode terminal 22, and the fourth connection portion 263 is located on a side of the plurality of electrode assemblies 24 facing the second electrode terminal 25.

[0357] 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 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.

[0358] For example, in Figure 22, 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.

[0359] 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; on the other hand, 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 can be kept away from each other, which is beneficial to reducing the risk of short circuit between the third connection portion 233 and the fourth connection portion 263, thereby improving the reliability of the battery cell 20.

[0360] According to some embodiments of the present application, as shown in Figure 22, 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 further include a third insulating member 29 and a fourth insulating member 30. 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. 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. 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.

[0361] The third connection portion 233 of the first current collecting member 23 is located on a side of the third insulating member 29 facing away from the plurality of electrode assemblies 24 in the first direction X, so that the third connection portion 233 and the electrode assemblies 24 are insulated and separated by the third insulating member 29. Similarly, the fourth connection portion 263 of the second current collecting member 26 is located on a side of the fourth insulating member 30 facing away from the plurality of electrode assemblies 24 in the first direction X, so that the fourth connection portion 263 and the electrode assemblies 24 are insulated and separated by the fourth insulating member 30.

[0362] For example, the third insulating member 29 can be made of various materials, such as silicone, rubber, or plastic, etc. Similarly, the fourth insulating member 30 can also be made of various materials, such as silicone, rubber, or plastic, etc.

[0363] 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.

[0364] In some embodiments, as shown in FIG. 22 , along the first direction X, a first slot 31 is provided on a side of the third insulating member 29 facing away from the electrode assembly 24 , and the third connecting portion 233 is accommodated in the first slot 31 .

[0365] 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 connection 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 connection portion 233 and the multiple electrode assemblies 24, and the third insulating member 29 and the third connection portion 233 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 20.

[0366] In some embodiments, please continue to refer to FIG. 22 . Along the first direction X, a second slot 32 is provided on a side of the fourth insulating member 30 facing away from the electrode assembly 24 . The fourth connecting portion 263 is accommodated in the second slot 32 .

[0367] 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 multiple 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.

[0368] It should be noted that in embodiments where the first electrode tab 242 and the second electrode tab 243 are respectively disposed at the ends of the main body 241 along the second direction Y, the main body 241 of the electrode assembly 24 can have a variety of shapes. For example, as shown in Figures 18 and 22, the main body 241 of the electrode assembly 24 has a rectangular parallelepiped structure, and the first electrode tab 242 and the second electrode tab 243 are respectively connected to the ends of the main body 241 along the second direction Y. Of course, the structure of the battery cell 20 is not limited to this. Referring to Figure 23, which is a schematic diagram of the assembly of the first current collecting member 23 and the electrode assembly 24 of the battery cell 20 provided in other embodiments of the present application, the main body 241 of the electrode assembly 24 has a cylindrical shape, and the first electrode tab 242 and the second electrode tab 243 are respectively connected to the ends of the main body 241 along the second direction Y. For another example, referring to Figure 24, Figure 24 is a schematic diagram of the assembly of the first current collecting component 23 and the electrode assembly 24 of the battery cell 20 provided in some other embodiments of the present application. The main body 241 of the electrode assembly 24 is polygonal, 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.

[0369] 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.

[0370] Illustratively, the buffer member can be of various types, such as foam, silicone pad or rubber pad.

[0371] 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 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.

[0372] According to some embodiments of the present application, referring to Figures 3 and 4, 10 and 11, 15 and 16, 17 and 18, and 22, the battery cell 20 includes N electrode assemblies 24 stacked along a first direction X, satisfying N≥5.

[0373] 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.

[0374] It should be noted that, in some embodiments, the battery cell 20 may further 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 embodiments where the first pole tab 242 and the second pole tab 243 are both located at the same end of the main body 241, the two pole tabs close to each other in two adjacent rows of electrode assemblies 24 are both the first pole tab 242 or the second pole tab 243, so that the two pole tabs 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.

[0375] 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.

[0376] According to some embodiments of the present application, please continue to refer to Figures 3 and 4, Figures 10 and 11, Figures 15 and 16, Figures 17 and 18, and Figure 22, the housing 21 may include a shell 212 and an end cap 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, which is used to receive the electrode assembly 24. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0377] 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 .

[0378] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer shell 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodating cavity having an opening 2121, which 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 can be a bottom wall of the shell 212 and the end cap 213, which 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.

[0379] By configuring the wall portion 211 of the outer shell 21 as an end cap 213 for closing the opening 2121 of the outer shell 21, a battery cell 20 employing this structure facilitates assembly of components such as the first electrode terminal 22 on the end cap 213, and facilitates connection between the first current collecting member 23 and the first electrode terminal 22, thereby reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20. Similarly, by configuring the wall portion 211 of the outer shell 21 as a wall of the housing 212, a battery cell 20 employing this structure can position the area of ​​the outer shell 21 where components such as the first electrode terminal 22 are mounted away from the end cap 213. This mitigates the direct action of forces exerted on the end cap 213 by components such as the first electrode terminal 22 pulling or twisting the wall portion 211, thereby reducing the risk of connection failure between the end cap 213 and the housing 212, and thereby effectively reducing the risk of leakage during use of the battery cell 20.

[0380] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0381] As shown in FIG. 2 , the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0382] 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 .

[0383] 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, 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 can 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.

[0384] 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 rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0385] Optionally, the number of battery cells 20 disposed within the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 may comprise multiple battery cells 20 that are first connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0386] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0387] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0388] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0389] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0390] 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 solutions.

[0391] The energy storage cabinet includes a cabinet body, a plurality of battery cells 20 are disposed in the cabinet body, and the plurality of battery cells 20 are arranged along the second direction Y.

[0392] According to some embodiments of the present application, as shown in Figures 10 to 14 , a battery cell 20 is provided. The battery cell 20 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 includes a shell 212 and an end cap 213. The shell 212 defines an accommodating cavity with an opening 2121. The end cap 213 closes the opening 2121 and serves as the wall portion 211. The plurality of electrode assemblies 24 are accommodated within the accommodating cavity. The plurality of electrode assemblies 24 are stacked along a first direction X, and the wall portion 211 is disposed 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 located at the same end of the main body 241 along the second direction Y. Multiple first electrode tabs 242 and multiple second electrode tabs 243 of the 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 located on the same wall 211, and are spaced apart along the third direction Z. 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 located within the housing 21, and are spaced apart along the third direction Z. The first current collecting member 23 includes a first connecting portion 232 and a third connecting portion 233 that are interconnected. The first connecting portion 232 is located on the side of the main body 241 where the first electrode tab 242 is provided in the second direction Y and is connected to the first electrode tabs 242 of the plurality of electrode assemblies 24. The third connecting 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 provided on the side of the third connecting portion 233 facing 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 relief area 231 is provided on the first connecting portion 232 and extends through the first connecting portion 232 along the second direction Y. The first electrode tab 242 passes through the first relief area 231 and is connected to the side of the first connecting portion 232 facing 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 connecting portion 262 and a fourth connecting portion 263 connected to each other. The second connecting portion 262 is located on the side of the main body 241 where the second electrode tab 243 is provided in the second direction Y and is connected to the second electrode tabs 243 of the plurality of electrode assemblies 24. The fourth connecting portion 263 is located between the wall portion 211 and the plurality of electrode assemblies 24 in the first direction X. A second protrusion 264 is provided on the side of the fourth connecting portion 263 facing away from the plurality of electrode assemblies 24. The second protrusion 264 is welded to the second electrode terminal 25 to electrically connect the second electrode terminal 25 to the plurality of electrode assemblies 24. A second relief area 261 is provided on the second connecting portion 262 and extends through the second connecting portion 262 along the second direction Y. The second electrode tab 243 passes through the second relief area 261 and is connected to the side of the second connecting portion 262 facing away from the main body 241. The second avoidance area 261 is a through hole provided on the second connecting portion 262 or a notch provided on the edge of the second connecting portion 262 in the third direction Z. The first insulating member 27 is provided along the second direction Y on the side of the first connecting portion 232 and the second connecting portion 262 facing away from the main body 241 to insulate and isolate the first connecting portion 232 from the housing 21, and the second connecting portion 262 from the housing 21. The second insulating member 28 is provided along the second direction Y between the first connecting portion 232 and the second connecting portion 262 and the main body 241 to insulate and isolate the first connecting portion 232 from the main body 241, and the second connecting portion 262 from the main body 241. The third insulating member 29 is provided along the first direction X between the third connecting portion 233 and the fourth connecting portion 263 and the plurality of electrode assemblies 24 to insulate and isolate the third connecting portion 233 from the electrode assemblies 24, and the fourth connecting portion 263 from the electrode assemblies 24. Along the first direction X, a first slot 31 is provided on the side of the third insulating member 29 facing 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 facing away from the electrode assembly 24, and the fourth connecting portion 263 is accommodated in the second slot 32.

[0393] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0394] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: 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, wherein: 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, wherein: 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, wherein: 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 any one of claims 1 to 4, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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 any one of claims 6 to 9, wherein: 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 any one of claims 6 to 10, wherein: 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, wherein: 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 or 12, wherein: 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 any one of claims 11 to 13, wherein: 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, wherein: 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 any one of claims 11 to 13, wherein: 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, wherein: 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 or 17, wherein: 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, wherein: 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, wherein: 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 or 17, wherein: 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, wherein: 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, wherein: 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 any one of claims 6 to 10, wherein: 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, wherein: 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 or 25, wherein: 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 any one of claims 24 to 26, wherein: 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, wherein: 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 or 28, wherein: 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, wherein: 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, wherein: 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 or 28, wherein: 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, wherein: 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, wherein: 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 any one of claims 1 to 34, wherein: Along the first direction, a buffer is arranged between two adjacent electrode assemblies.

36. The battery cell according to any one of claims 1 to 35, wherein: The battery cell includes N electrode assemblies stacked along the first direction, and N≥5.

37. The battery cell according to any one of claims 1 to 36, wherein: 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 comprising the battery cell according to any one of claims 1 to 37.

39. An electrical device, comprising the battery cell according to any one of claims 1 to 37, wherein the battery cell is used to provide electrical energy.

40. An energy storage cabinet comprising a plurality of battery cells according to any one of claims 1 to 37.

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