Battery cell, battery, electric device, and energy storage apparatus

Abstract

Embodiments of the present application relate to the technical field of batteries, and provide a battery cell, a battery, an electric device, and an energy storage apparatus. The battery cell comprises a casing and an electrode assembly, the electrode assembly is accommodated in the casing, the volume of the casing is V, the capacity of the battery cell is C, and the volume of the casing and the capacity of the battery cell satisfy: 1.4 dm3≤V≤65 dm3, and 400 Ah≤C≤5000 Ah. Therefore, the situation that the battery cell has a too small volume and a too high capacity is avoided, so that the manufacturing cost of a high-capacity battery cell is reduced, achieving better economy; and the situation that the battery cell has a too large volume and a too low capacity is avoided, so that the volume energy density of the high-capacity battery cell is improved, thus taking both the economy and energy density requirements of the battery cell into account.

Description

Battery cells, batteries, electrical equipment and energy storage devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application (202311667805.7) filed on December 6, 2023, entitled “Battery Cell, Battery, Electrical Equipment and Energy Storage Device,” 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 device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As a core component of new energy vehicles, batteries have high performance requirements.

[0005] Batteries typically include multiple battery cells, which are typically connected in series, parallel, or in a hybrid configuration. Currently, battery cells are relatively small in size and capacity. To meet high-capacity requirements, more battery cells are required. As the number of battery cells increases, the number of components required to connect multiple battery cells increases, and the battery management system and wires used increase, leading to higher battery costs. To reduce costs, the capacity of the battery cells can be increased, thereby reducing the number of battery cells in the battery. Currently, it is difficult to achieve both economic efficiency and energy density requirements for large-capacity battery cells.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery cell, a battery, an electrical device, and an energy storage device, which can effectively take into account the economy and energy density requirements of the battery cell.

[0008] In a first aspect, an embodiment of the present application provides a battery cell, comprising a housing and an electrode assembly, wherein the electrode assembly is housed in the housing, the volume of the housing is V, the capacitance of the battery cell is C, and the following conditions are met: 1.4dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah.

[0009] In the above technical solution, 1.4dm 3 ≤V≤65dm 3, 400Ah≤C≤5000Ah, so that the battery cell will not be too small in size and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, so that the battery cell will not be too large in size and too small in capacity, thereby improving the volume energy density of large-capacity battery cells, thus taking into account the economy and energy density requirements of the battery cell.

[0010] In some embodiments, the positive electrode material of the battery cell includes a lithium-containing phosphate, 2.5 dm 3 ≤V≤46dm 3 For battery cells containing lithium phosphate as the positive electrode material, the volume of the housing is controlled within 2.5dm 3 ~46dm 3 , which can further reduce the manufacturing cost of large-capacity battery cells and improve the volume energy density of large-capacity battery cells, further taking into account the economy and energy density requirements of battery cells.

[0011] In some embodiments, 400Ah≤C≤1500Ah, 2.5dm 3 ≤V≤13.8dm 3 The volume and capacity of battery cells containing positive electrode materials including lithium phosphate are more closely matched, and battery cells with a capacity of 400Ah≤C≤1500Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economy. The volume energy density of large-capacity battery cells will also be increased.

[0012] In some embodiments, 1500Ah<C≤3000Ah, 9.6dm 3 ≤V≤27.6dm 3 The volume and capacity of battery cells containing lithium phosphates, including positive electrode materials, are more closely matched, and battery cells with a capacity of 1500Ah < C ≤ 3000Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. The volume energy density of large-capacity battery cells will also be increased.

[0013] In some embodiments, 3000Ah<C≤5000Ah, 19.3dm 3 ≤V≤46dm 3The volume and capacity of battery cells containing lithium phosphate as positive electrode materials are more closely matched, and battery cells with a capacity of 3000Ah < C ≤ 5000Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. The volume energy density of large-capacity battery cells will also be increased.

[0014] In some embodiments, the positive electrode material of the battery cell includes lithium transition metal oxide, 1.4dm 3 ≤V≤40.6dm 3 For battery cells whose cathode materials include lithium transition metal oxides, the volume of the housing is controlled within 1.4 dm 3 ~40.6dm 3 , which can further reduce the manufacturing cost of large-capacity battery cells and improve the volume energy density of large-capacity battery cells, further taking into account the economy and energy density requirements of battery cells.

[0015] In some embodiments, 400Ah≤C≤1500Ah, 1.4dm 3 ≤V≤12.2dm 3 The volume and capacity of battery cells whose positive electrode materials include lithium transition metal oxides are more closely matched, and battery cells with a capacity of 400Ah≤C≤1500Ah will not be too small and have too large a capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economy. The volume energy density of large-capacity battery cells will also be increased.

[0016] In some embodiments, 1500Ah<C≤3000Ah, 6.2dm 3 ≤V≤24.4dm 3 The volume and capacity of battery cells whose positive electrode materials include lithium transition metal oxides are more closely matched, and battery cells with a capacity of 1500Ah < C ≤ 3000Ah will not be too small and have too large a capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economy. The volume energy density of large-capacity battery cells will also be increased.

[0017] In some embodiments, 3000Ah<C≤5000Ah, 12.4dm 3 ≤V≤40.6dm 3The volume and capacity of battery cells whose positive electrode materials include lithium transition metal oxides are more closely matched, and battery cells with a capacity of 3000Ah < C ≤ 5000Ah will not be too small and have too large a capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economy. The volume energy density of large-capacity battery cells will also be increased.

[0018] In some embodiments, the battery cell is a sodium battery, 3.5dm 3 ≤V≤65dm 3 For sodium batteries, the volume of the shell is controlled at 3.5dm 3 ~65dm 3 , which can further reduce the manufacturing cost of large-capacity battery cells and improve the volume energy density of large-capacity battery cells, further taking into account the economy and energy density requirements of battery cells.

[0019] In some embodiments, 400Ah≤C≤1500Ah, 3.5dm 3 ≤V≤19.4dm 3 The volume and capacity of sodium batteries are more closely matched, and battery cells with a capacity range of 400Ah≤C≤1500Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. The volume energy density of large-capacity battery cells will also be increased.

[0020] In some embodiments, 1500Ah<C≤3000Ah, 13.8dm 3 ≤V≤38.7dm 3 The volume and capacity of sodium batteries are more closely matched, and battery cells with a capacity of 1500Ah < C ≤ 3000Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. The volume energy density of large-capacity battery cells will also be increased.

[0021] In some embodiments, 3000Ah<C≤5000Ah, 27.6dm 3 ≤V≤65dm 3 The volume and capacity of sodium batteries are more closely matched, and battery cells with a capacity of 3000Ah < C ≤ 5000Ah will not be too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. The volume energy density of large-capacity battery cells will also be increased.

[0022] In some embodiments, the volume of the electrode assembly is V1, the number of electrode assemblies contained in the housing is N, and the following conditions are met: 0.2 dm 3 ≤V1≤7.8dm 3 , N≥5. The volume of the electrode assembly is controlled within 0.2dm 3 ~7.8dm 3 , which can reduce the manufacturing difficulty and cost of electrode assemblies. And N≥5 can achieve the large capacity requirements of battery cells. In other words, 0.2dm 3 ≤V1≤7.8dm 3 , N≥5 can not only reduce the manufacturing difficulty and cost of the electrode assembly, but also meet the large capacity requirements of the battery cell.

[0023] In some embodiments, an electrode assembly includes a main body, a first tab, and a second tab. The first tab and the second tab have opposite polarities and are disposed on the main body. A battery cell includes a first current collecting member, a second current collecting member, and multiple electrode assemblies. Along a first direction, the first tabs of the multiple electrode assemblies are located at the same end of the main body, and the second tabs of the multiple electrode assemblies are located at the same end of the main body. The first current collecting member connects the first tabs of the multiple electrode assemblies, and the second current collecting member connects the second tabs of the multiple electrode assemblies. Connecting the first tabs of the multiple electrode assemblies by the first current collecting member allows for current converging between the first tabs of the multiple electrode assemblies, while connecting the second tabs of the multiple electrode assemblies by the second current collecting member allows for current converging between the second tabs of the multiple electrode assemblies. This eliminates the need to enlarge the size of a single electrode assembly, thereby reducing the manufacturing difficulty of high-capacity battery cells.

[0024] In some embodiments, along the first 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 facing away from the main body and connected to the first current collecting member. Positioning at least a portion of the first current collecting member on the side of the main body where the first tab is disposed facilitates connection between the first current collecting member and the first tab, thereby reducing assembly difficulty between the first current collecting member and the first tab. Furthermore, positioning a portion of the first tab on a side of the first current collecting member facing away from the main body in the first direction and connecting this portion to the first current collecting member allows the first tab to bypass the first current collecting member and connect to the side of the first current collecting member facing away from the main body. This reduces connection difficulty between the first tab and the first current collecting member and reduces the pressure of the first current collecting member on the first tab toward the main body, thereby reducing the risk of shorting caused by the first tab being inserted upside down into the main body.

[0025] In some embodiments, a first escape zone is provided on the first current collecting member. The first escape zone extends through the first current collecting member in a first direction, and the first tab passes through the first escape zone and connects to the side of the first current collecting member facing away from the main body. By providing the first escape zone on the first current collecting member and extending through the first current collecting member in the first direction, the first tab can pass through the first escape zone and connect to the side of the first current collecting member facing away from the main body. Battery cells employing this structure facilitate having the first tab connected to the side of the first current collecting member facing away from the main body, reducing the difficulty of the first tab bypassing the first current collecting member and optimizing the length of the first tab bypassing the first current collecting member. This alleviates redundancy in the first tab and reduces the manufacturing cost of the battery cells.

[0026] In some embodiments, the first escape area is a through-hole provided on the first current collecting member; or, the first escape area is a notch provided on the edge of the first current collecting member. The first escape area can be a through-hole provided on the first current collecting member or a notch provided on the edge of the first current collecting member, so that the first tab can pass through the first escape area and connect to the side of the first current collecting member facing away from the main body. This simplifies the structure and facilitates manufacturing.

[0027] In some embodiments, the first current collecting member is disposed within the housing; or, alternatively, the first current collecting member is disposed outside the housing. The housing is provided with a first aperture along a first direction for each first tab to extend out of the housing. Each first tab extends out of the housing through a corresponding first aperture and connects to the first current collecting member. Placing the first current collecting member within the housing reduces the difficulty of assembling the first tabs and the first current collecting member, thereby improving battery cell production efficiency. The housing also provides protection for the first current collecting member, reducing wear or damage to the first current collecting member during use. By arranging the first current collecting member outside the housing, with the first aperture provided in the housing for the first tab to extend through, battery cells employing this structure can reduce the internal space occupied by the first current collecting member within the housing, freeing up more space for the electrode assembly and thereby improving the volumetric energy density of the battery cell. Furthermore, it facilitates subsequent inspection, maintenance, and replacement of the first current collecting member, thereby reducing battery cell maintenance costs.

[0028] In some embodiments, along the first direction, at least a portion of the second current collecting member is located on the side of the main body where the second tab is disposed, while a portion of the second tab is located on the side of the second current collecting member facing away from the main body and connected to the second current collecting member. Positioning at least a portion of the second current collecting member on the side of the main body where the second tab is disposed facilitates connection between the second current collecting member and the second tab, thereby reducing assembly difficulty between the second current collecting member and the second tab. Furthermore, positioning a portion of the second tab on the side of the second current collecting member facing away from the main body in the first direction and connecting it to the second current collecting member allows the second tab to bypass the second current collecting member and connect to the side of the second current collecting member facing away from the main body. This reduces connection difficulty between the second tab and the second current collecting member while also reducing the tendency of the second current collecting member to press down on the second tab toward the main body, thereby reducing the risk of shorting caused by the second tab being inserted upside down into the main body.

[0029] In some embodiments, a second run-off region is provided on the second current collecting member, extending along a first direction through the second current collecting member. The second tab passes through the second run-off region and is connected to the side of the second current collecting member facing away from the main body. By providing the second run-off region on the second current collecting member and extending along the first direction through the second current collecting member, the second tab can pass through the second run-off region and then connect to the side of the second current collecting member facing away from the main body. Battery cells employing this structure facilitate having the second tab connected to the side of the second current collecting member facing away from the main body, reducing the difficulty of the second tab bypassing the second current collecting member and optimizing the length of the second tab bypassing the second current collecting member. This alleviates the problem of redundant second tabs and reduces the manufacturing cost of the battery cells.

[0030] In some embodiments, the second escape area is a through-hole provided on the second current collecting member; or, the second escape area is a notch provided on the edge of the second current collecting member. The second escape area can be a through-hole provided on the second current collecting member or a notch provided on the edge of the second current collecting member, so that the second tab can pass through the second escape area and connect to the side of the second current collecting member facing away from the main body, resulting in a simple structure and easy manufacturing.

[0031] In some embodiments, the second current collecting member is disposed within the housing; or, alternatively, the second current collecting member is disposed outside the housing. The housing is provided with a second aperture along a first direction for each second tab to extend out of the housing. Each second tab extends out of the housing through a corresponding second aperture and connects to the second current collecting member. Placing the second current collecting member inside the housing reduces the difficulty of assembling the second tabs and the second current collecting member, thereby improving battery cell production efficiency. The housing also provides some protection for the second current collecting member, reducing wear or damage to the second current collecting member during use. By arranging the second current collecting member outside the housing, with the second aperture provided in the housing for the second tab to extend through, battery cells employing this structure can reduce the internal space occupied by the second current collecting member, freeing up more space for the electrode assembly and thereby improving the volumetric energy density of the battery cell. Furthermore, it facilitates subsequent inspection, maintenance, and replacement of the second current collecting member, thereby reducing battery cell maintenance costs.

[0032] In some embodiments, the first and second tabs are both disposed at the same end of the main body along the first direction; the first current collecting member includes a first connecting portion connecting each first tab, and the second current collecting member includes a second connecting portion connecting each second tab. The first and second connecting portions are both located on the side of the main body in the first direction where the first and second tabs are disposed, and the first and second connecting portions are spaced apart. By disposing the first and second tabs at the same end of the main body in the first direction, and by having the first and second connecting portions of the first and second current collecting members both located on the side of the main body where the first and second tabs are disposed, it is not only easier to connect the first current collecting member to the first tab, but also easier to connect the second current collecting member to the second tab, thereby reducing assembly difficulty. Furthermore, the first and second current collecting members can share space in the first direction, thereby reducing the space occupied by the first and second current collecting members in the first direction, thereby improving space utilization of the battery cells and increasing the volumetric energy density of the battery cells.

[0033] In some embodiments, the battery cell includes a first insulating member, which is disposed along a first direction on a side of the first and second connecting portions facing away from the main body to insulate and isolate the first connecting portion from the outer shell, and the second connecting portion from the outer shell. In this way, the first insulating member is located between the first and second connecting portions and the outer shell in the first direction. A battery cell employing this structure can, on the one hand, achieve insulation isolation between the first connecting portion and the outer shell, and between the second connecting portion and the outer shell, thereby reducing the risk of short circuits between the first and second current collecting members and the outer shell. On the other hand, the first and second connecting portions of the first and second current collecting members can share a single first insulating member, thereby optimizing the assembly process of the battery cell and reducing the manufacturing cost of the battery cell.

[0034] In some embodiments, the battery cell includes a second insulating member, which is disposed along a first direction on a side of the first and second connecting portions facing the main body to insulate and isolate the first connecting portion from the main body, and the second connecting portion from the main body. Thus, the second insulating member is located between the first and second connecting portions and the main body in the second direction. A battery cell employing this structure can, on the one hand, achieve insulation isolation between the first connecting portion and the main body, and between the second connecting portion and the main body, thereby reducing the risk of short circuits between the first and second current collecting members and the main body. Furthermore, the battery cell can share a single second insulating member for the first and second connecting portions of the first and second current collecting members, thereby optimizing the assembly process of the battery cell and reducing the manufacturing cost of the battery cell.

[0035] In some embodiments, the housing includes a first wall portion along a first direction, and a first current collecting member and a second current collecting member are both disposed on a side of the main body facing the first wall portion. The first wall portion is provided with a first electrode terminal and a second electrode terminal, and the first and second current collecting members are connected to the first and second electrode terminals, respectively. By disposing the first and second current collecting members on the side of the main body facing the first wall portion, and disposing the first and second electrode terminals, respectively connected to the first and second current collecting members, on the first wall portion, the distance between the first electrode terminal and the first tab, and between the second electrode terminal and the second tab, can be reduced, thereby facilitating reductions in the size of the first and second current collecting members and shortening the current flow path from the first tab to the first electrode terminal, and from the second tab to the second electrode terminal.

[0036] In some embodiments, the plurality of electrode assemblies are arranged along a second direction that intersects the first direction; the first current collecting member includes a third connecting portion connected to the first connecting portion; the second current collecting member includes a fourth connecting portion connected to the second connecting portion; the housing includes a second wall along the second direction, the third connecting portion and the fourth connecting portion are both located on a side of the plurality of electrode assemblies that faces the second wall; the second wall is provided with a first electrode terminal and a second electrode terminal, the third connecting portion and the fourth connecting portion are connected to the first electrode terminal and the second electrode terminal, respectively. The plurality of electrode assemblies are arranged along the second direction, and the housing includes a second wall arranged along the second direction such that the second wall is aligned with the arrangement direction of the plurality of electrode assemblies. The first current collecting member has a third connecting portion connected to the first connecting portion, and the second current collecting member has a fourth connecting portion connected to the second connecting portion. By connecting the third connecting portion to the first electrode terminal provided on the second wall portion, and connecting the first connecting portion to the first electrode tabs of the multiple electrode assemblies, the first electrode tab is electrically connected to the first electrode terminal through the first current collecting member. By connecting the fourth connecting portion to the second electrode terminal provided on the second wall portion, and connecting the second connecting portion to the second electrode tabs of the multiple electrode assemblies, the second electrode tab is electrically connected to the second electrode terminal through the second current collecting member. In a battery cell adopting this structure, the first electrode terminal and the second electrode terminal are arranged on the second wall portion in the second direction, so that the wall portion of the shell facing the main body along the first direction is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating the stacking of multiple battery cells along the first direction. On the other hand, it can achieve the separation of 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, and can achieve the separation of the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole tab, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole tab, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole tab, and can reduce the interference problem between the first electrode terminal and the first pole tab and between the second electrode terminal and the second pole tab. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0037] In some embodiments, the battery cell includes a third insulating member, which is disposed along the second direction on the side of the third and fourth connecting portions facing the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assembly, and the fourth connecting portion from the electrode assembly. The provision of the third insulating member not only provides insulation isolation between the third connecting portion and the electrode assembly, and between the fourth connecting portion and the electrode assembly, thereby reducing the risk of short circuits, but also allows the third connecting portion of the first current collecting member and the fourth connecting portion of the second current collecting member to share a single third insulating member, thereby optimizing the assembly process of the battery cell and reducing the manufacturing cost of the battery cell.

[0038] In some embodiments, a first slot is provided on the side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the third connecting portion being received within the first slot; and / or a second slot is provided on the side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the fourth connecting portion being received within the second slot. Providing the first slot on the side of the third insulating member facing away from the electrode assemblies along the second direction allows the third connecting portion of the first current collecting member to be received within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the third connecting portion share space in the second direction, thereby improving the internal space utilization of the battery cell. Similarly, providing the second slot on the side of the third insulating member facing away from the electrode assemblies along the second direction allows the fourth connecting portion of the second current collecting member to be received within the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the fourth connecting portion share space in the second direction, thereby improving the internal space utilization of the battery cell.

[0039] In some embodiments, a plurality of electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; the first current collecting member includes a third connection portion, which is connected to the first connection portion, and the second current collecting member includes a fourth connection portion, which is connected to the second connection portion. Along the second direction, the outer shell includes a second wall portion and a third wall portion that are oppositely arranged, and the third connection portion is located on a side of the plurality of electrode assemblies facing the second wall portion, and the fourth connection portion is located on a side of the plurality of electrode assemblies facing the third wall portion; wherein the second wall portion is provided with a first electrode terminal, the third wall portion is provided with a second electrode terminal, and the third connection portion and the fourth connection portion are respectively connected to the first electrode terminal and the second electrode terminal. By respectively arranging the first electrode terminal and the second electrode terminal on the second wall portion and the third wall portion which are arranged opposite to each other in the second 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 for the third connection portion of the first current collecting member to be connected to the first electrode terminal, and it is convenient for the fourth connection portion of the second current collecting member to be connected to the second electrode terminal. On the other hand, it is possible to achieve a large distance between the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member, 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.

[0040] In some embodiments, a battery cell includes a third insulating member and a fourth insulating member; the third insulating member is disposed along the second direction between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assemblies; and the fourth insulating member is disposed along the second direction between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion from the electrode assemblies. By disposing the third insulating member between the third connecting portion and the plurality of electrode assemblies, and the fourth insulating member between the fourth connecting portion and the plurality of electrode assemblies, insulation isolation can be achieved between the third connecting portion and the plurality of electrode assemblies, and between the fourth connecting portion and the plurality of electrode assemblies, thereby reducing the risk of internal short circuits in the battery cell and improving the reliability of the battery cell.

[0041] In some embodiments, a first slot is provided on a side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the third connecting portion being received within the first slot; and / or a second slot is provided on a side of the fourth insulating member facing away from the plurality of electrode assemblies along the second direction, with the fourth connecting portion being received within the second slot. Providing the first slot on the side of the third insulating member facing away from the plurality of electrode assemblies along the second direction allows the third connecting portion of the first current collecting member to be received within the first slot, thereby improving the structural stability of the third insulating member when assembled between the third connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the third connecting portion can share space in the first direction, thereby facilitating improved internal space utilization of the battery cell. Similarly, providing the second slot on the side of the fourth insulating member facing away from the plurality of electrode assemblies along the second direction allows the fourth connecting portion of the second current collecting member to be received within the second slot, thereby improving the structural stability of the fourth insulating member when assembled between the fourth connecting portion and the plurality of electrode assemblies. Furthermore, the fourth insulating member and the fourth connecting portion can share space in the second direction, thereby facilitating improved internal space utilization of the battery cell.

[0042] In some embodiments, a first electrode tab and a second electrode tab are disposed at opposite ends of the main body along a first direction. The first current collecting member includes a first connecting portion connecting each first electrode tab, the first connecting portion being located on the side of the main body where the first electrode tab is disposed in the first direction. The second current collecting member includes a second connecting portion connecting each second electrode tab, the second connecting portion being located on the side of the main body where the second electrode tab is disposed in the first direction. By disposing the first and second electrode tabs at opposite ends of the main body in the first direction, and disposing the first and second connecting portions of the first and second current collecting members on opposite sides of the plurality of electrode assemblies in the first direction, the first and second current collecting members are facilitated to connect to the first and second electrode tabs, respectively, thereby mitigating interference between the first and second current collecting members. Furthermore, the first and second electrode tabs of opposite polarity are kept apart from each other, and the first and second connecting portions of the first and second current collecting members are kept apart from each other. This reduces the risk of short circuits between the first and second electrode tabs, as well as between the first and second current collecting members, thereby improving the reliability of the battery cells.

[0043] In some embodiments, a battery cell includes two first insulating members, which are disposed along a first direction on either side of the plurality of electrode assemblies. One first insulating member is located on a side of the first connecting portion facing away from the main body to insulate the first connecting portion from the outer shell, and the other first insulating member is located on a side of the second connecting portion facing away from the main body to insulate the second connecting portion from the outer shell. In this manner, a first insulating member is disposed between the first connecting portion and the outer shell, and between the second connecting portion and the outer shell. Thus, the two first insulating members can respectively provide insulation between the first connecting portion and the outer shell, and between the second connecting portion and the outer shell. This helps reduce the risk of short circuits between the first and second current collecting members and the outer shell, thereby improving the reliability of the battery cell.

[0044] In some embodiments, a battery cell includes two second insulating members, which are disposed on either side of the plurality of electrode assemblies along a first direction. Along the first direction, one second insulating member is located on the side of the first connecting portion facing the main body to insulate and isolate the first connecting portion from the main body, and the other second insulating member is located on the side of the second connecting portion facing the main body to insulate and isolate the second connecting portion from the main body. In this way, a second insulating member is disposed between the first connecting portion and the main body, and between the second connecting portion and the main body. Thus, the two second insulating members can respectively achieve insulation isolation between the first connecting portion and the main body, and between the second connecting portion and the main body, thereby reducing the risk of short circuits between the first and second current collecting members and the main body, thereby improving the reliability of the battery cell.

[0045] In some embodiments, a plurality of electrode assemblies are arranged along a second direction that intersects the first direction; a first current collecting member includes a third connecting portion connected to the first connecting portion; a second current collecting member includes a fourth connecting portion connected to the second connecting portion; and a housing includes a first wall portion along the second direction. The third and fourth connecting portions are both located on a side of the plurality of electrode assemblies facing the first wall portion. The first and second electrode terminals are provided on the first wall portion, and the third and fourth connecting portions are connected to the first and second electrode terminals, respectively. The first and second electrode terminals are both provided on the first wall portion, and the third and fourth connecting portions of the first and second current collecting members are both located on a side of the plurality of electrode assemblies facing the first wall portion. This facilitates connection of the third connecting portion of the first current collecting member to the first electrode terminal and the fourth connecting portion of the second current collecting member to the second electrode terminal. Furthermore, the battery cells are configured such that the first and second electrode terminals are located at the same end in the second direction, and the third and fourth connecting portions share space in the second direction, thereby improving space utilization of the battery cells and increasing the volumetric energy density of the battery cells. In addition, in a battery cell adopting this structure, the first electrode terminal and the second electrode terminal are arranged on the first wall portion in the second direction, so that the wall portion of the shell facing the main body along the first direction is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating the stacking of multiple battery cells along the first direction. On the other hand, it can achieve the separation of 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, and can achieve the separation of the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole tab, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole tab, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole tab, and can reduce the interference problem between the first electrode terminal and the first pole tab and between the second electrode terminal and the second pole tab. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0046] In some embodiments, the battery cell includes a third insulating member, which is disposed along the second direction on the side of the third and fourth connecting portions facing the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assembly, and the fourth connecting portion from the electrode assembly. The provision of the third insulating member not only provides insulation isolation between the third connecting portion and the electrode assembly, and between the fourth connecting portion and the electrode assembly, thereby reducing the risk of short circuits, but also allows the third connecting portion of the first current collecting member and the fourth connecting portion of the second current collecting member to share a single third insulating member, thereby optimizing the assembly process of the battery cell and reducing the manufacturing cost of the battery cell.

[0047] In some embodiments, a first slot is provided on the side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the third connecting portion being received within the first slot; and / or a second slot is provided on the side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the fourth connecting portion being received within the second slot. Providing the first slot on the side of the third insulating member facing away from the electrode assemblies along the second direction allows the third connecting portion of the first current collecting member to be received within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the third connecting portion share space in the second direction, thereby improving the internal space utilization of the battery cell. Similarly, providing the second slot on the side of the third insulating member facing away from the electrode assemblies along the second direction allows the fourth connecting portion of the second current collecting member to be received within the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the fourth connecting portion share space in the second direction, thereby improving the internal space utilization of the battery cell.

[0048] In some embodiments, multiple electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; the first current collecting member includes a third connection portion, which is connected to the first connection portion, and the second current collecting member includes a fourth connection portion, which is connected to the second connection portion. Along the second direction, the outer shell includes a first wall portion and a second wall portion arranged opposite to each other, the third connection portion is located on a side of the multiple electrode assemblies facing the first wall portion, and the fourth connection portion is located on a side of the multiple electrode assemblies facing the second wall portion; wherein the first wall portion is provided with a first electrode terminal, the second wall portion is provided with a second electrode terminal, and the third connection portion and the fourth connection portion are respectively connected to the first electrode terminal and the second electrode terminal. By respectively arranging the first electrode terminal and the second electrode terminal on the first wall portion and the second wall portion which are arranged opposite to each other along the second 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 for the third connection portion of the first current collecting member to be connected to the first electrode terminal, and it is convenient for the fourth connection portion of the second current collecting member to be connected to the second electrode terminal. On the other hand, it is possible to achieve 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 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. In addition, with a battery cell of this structure, the first electrode terminal and the second electrode terminal are respectively arranged on the first wall portion and the second wall portion in the second direction, so that the wall portion of the shell facing the main body along the first direction is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating the stacking of multiple battery cells along the first direction. On the other hand, it is possible to separate the area where the first current collecting member is connected to the first electrode terminal and the area where the first current collecting member is connected to the first pole tab, and to separate the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole tab, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole tab, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole tab, and can reduce the interference problem between the first electrode terminal and the first pole tab and between the second electrode terminal and the second pole tab. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0049] In some embodiments, a battery cell includes a third insulating member and a fourth insulating member. The third insulating member is disposed along the second direction between the third connecting portion and the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assemblies. The fourth insulating member is disposed along the second direction between the fourth connecting portion and the plurality of electrode assemblies to insulate and isolate the fourth connecting portion from the electrode assemblies. This ensures insulation between the third connecting portion and the electrode assemblies, and between the fourth connecting portion and the electrode assemblies, thereby reducing the risk of short circuits in the battery cell and improving the reliability of the battery cell.

[0050] In some embodiments, a first slot is provided on a side of the third insulating member facing away from the plurality of electrode assemblies along the second direction, with the third connecting portion being received within the first slot; and / or a second slot is provided on a side of the fourth insulating member facing away from the plurality of electrode assemblies along the second direction, with the fourth connecting portion being received within the second slot. Providing the first slot on the side of the third insulating member facing away from the electrode assemblies along the second direction allows the third connecting portion of the first current collecting member to be received within the first slot, thereby improving the structural stability of the third insulating assembly between the third connecting portion and the plurality of electrode assemblies. Furthermore, the third insulating member and the third connecting portion can share space in the second direction, thereby improving the internal space utilization of the battery cell. Similarly, providing the second slot on the side of the fourth insulating member facing away from the electrode assemblies along the second direction allows the fourth connecting portion of the second current collecting member to be received within the second slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connecting portion and the plurality of electrode assemblies. Furthermore, the fourth insulating member and the fourth connecting portion can share space in the second direction, thereby improving the internal space utilization of the battery cell.

[0051] In some embodiments, a battery cell includes multiple electrode assemblies, and the housing has a storage space within which the multiple electrode assemblies are stored. The battery cell also includes a separator disposed within the storage space and configured to divide the storage space into multiple subspaces, each of which accommodates at least one electrode assembly. The separator is disposed within the storage space of the housing, dividing the storage space into multiple subspaces. The separator separates the electrode assemblies within each subspace, thereby reducing the risk of expansion stress accumulation in adjacent subspaces, which could lead to mutual compression and deformation of the electrode assemblies, and effectively improving the reliability of the battery cell.

[0052] In some embodiments, the partitioning device includes a partition wall configured to separate two adjacent subspaces, with a receiving cavity formed within the partition wall. The battery cell includes a thermal management component, which is received within the receiving cavity. The thermal management component is disposed within the receiving cavity of the partition wall, fully utilizing the space within the partition wall. While achieving temperature management of the electrode assembly, the space occupied by the thermal management component within the housing is reduced, freeing up more space for the electrode assembly, thereby facilitating an increase in the volumetric energy density of the battery cell.

[0053] In some embodiments, the outer surface of the housing is provided with an opening for the heat management component to enter the accommodating cavity, and the opening is in communication with the accommodating cavity. The outer surface of the housing is provided with an opening in communication with the accommodating cavity, and the heat management component can enter the accommodating cavity through the opening from the outside of the housing. When installing or removing the heat management component, there is no need to open the housing, which is more convenient.

[0054] In some embodiments, the partitioning device includes at least one partition wall disposed within the housing and connected to the housing, the partition wall being configured to separate two adjacent subspaces. Dividing the housing space within the housing into multiple subspaces using at least one partition wall provides a simple structure, with each partition wall being capable of separating the electrode assemblies within two adjacent subspaces. Because the partition wall is connected to the housing, the expansion force generated by the electrode assemblies within a subspace can be transmitted to the housing via the partition wall, reducing the risk of the expansion force generated by the electrode assembly in one subspace being transmitted to the electrode assembly in another adjacent subspace.

[0055] In some embodiments, multiple electrode assemblies are arranged along the second direction, and the separator includes multiple partition walls, which are spaced apart within the accommodation space along the second direction. The multiple partition walls arranged at intervals can divide the accommodation space into more subspaces, so that the electrode assemblies in more subspaces are separated by the partition walls. The expansion force generated by all electrode assemblies can be transmitted to the housing through the more partition walls, further reducing the risk of compression and deformation of the electrode assemblies.

[0056] In some embodiments, the subspace is formed inside the separator. After the electrode assembly is accommodated in the subspace, the separator can bear the expansion force of the electrode assembly in multiple directions, thereby improving the reliability of the battery cell.

[0057] In some embodiments, the separator includes multiple receiving units disposed within the housing space, each of which defines a subspace. Thus, each of the multiple receiving units can accommodate an electrode assembly, and the receiving units can absorb the expansion forces of the electrode assembly within the subspace in multiple directions. Furthermore, once the electrode assembly is housed within the receiving units, the receiving units can restrain the electrode assembly, reducing the risk of tilting or shaking within the housing.

[0058] In some embodiments, two adjacent receiving cells share a partition wall, which is configured to separate the subspaces of the two adjacent receiving cells. This allows the volume of the subspace to be increased, freeing up more space for the electrode assembly, thereby improving the volumetric energy density of the battery cells. Furthermore, the shared partition wall between two adjacent receiving cells allows the multiple receiving cells to function as a single unit, further simplifying the installation of the partition device within the housing.

[0059] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any embodiment of the first aspect.

[0060] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any one embodiment of the first aspect, wherein the battery cell is used to provide electrical energy.

[0061] In a fourth aspect, an embodiment of the present application provides an energy storage device, comprising a battery cell provided by any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] 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.

[0063] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0064] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0065] FIG3 is an exploded view of a battery cell (a first tab and a second tab are disposed at the same end of a main body) provided in some embodiments of the present application;

[0066] FIG4 is an assembly diagram of the battery cell shown in FIG3 ;

[0067] FIG5 is an exploded view of a battery cell (a first electrode tab and a second electrode tab are disposed at the same end of a main body) provided in some other embodiments of the present application;

[0068] FIG6 is a schematic structural diagram of the electrode assembly shown in FIG5 ;

[0069] FIG7 is an assembly diagram of the electrode assembly, the first current collecting member, and the second current collecting member shown in FIG5 ;

[0070] FIG8 is a schematic structural diagram of a first current collecting component provided in some embodiments of the present application;

[0071] FIG9 is a schematic structural diagram of a first current collecting component provided in other embodiments of the present application;

[0072] FIG10 is a schematic structural diagram of a second current collecting member provided in some embodiments of the present application;

[0073] FIG11 is a schematic structural diagram of a second current collecting component provided in other embodiments of the present application;

[0074] FIG12 is an exploded view of a battery cell (a first electrode tab and a second electrode tab are disposed at the same end of a main body) provided in some further embodiments of the present application;

[0075] FIG13 is an assembly diagram of the battery cell shown in FIG12;

[0076] FIG14 is an assembly diagram of the electrode assembly, the first current collecting member, and the second current collecting member shown in FIG12 ;

[0077] FIG15 is a schematic structural diagram of the first current collecting component shown in FIG12;

[0078] FIG16 is a schematic structural diagram of the second current collecting component shown in FIG12;

[0079] FIG17 is an exploded view of a battery cell (the first tab and the second tab are disposed at the same end of the main body) provided in yet other embodiments of the present application;

[0080] FIG18 is an assembly diagram of the battery cell shown in FIG17 ;

[0081] FIG19 is an exploded view of a battery cell (a first tab and a second tab are disposed at opposite ends of a main body) provided in some embodiments of the present application;

[0082] FIG20 is an assembly diagram of the battery cell shown in FIG19;

[0083] FIG21 is a schematic diagram illustrating the connection between the electrode assembly, the first current collecting member, and the second current collecting member shown in FIG19 ;

[0084] FIG22 is a schematic structural diagram of the first current collecting component shown in FIG19;

[0085] FIG23 is a schematic structural diagram of the second current collecting component shown in FIG19;

[0086] FIG24 is an exploded view of a battery cell (a first electrode tab and a second electrode tab are disposed at opposite ends of a main body) provided in some other embodiments of the present application;

[0087] FIG25 is an exploded view of a battery cell (with a separator disposed in the housing) provided in some embodiments of the present application;

[0088] FIG26 is a schematic diagram showing the connection between the housing and the partition device shown in FIG25 ;

[0089] FIG27 is a cross-sectional view of the housing shown in FIG26 taken along the XY section;

[0090] FIG28 is a schematic structural diagram of the housing shown in FIG25 ;

[0091] FIG29 is an exploded view of a battery cell (with a separator provided in the housing) provided in some other embodiments of the present application;

[0092] FIG30 is a schematic structural diagram of the partition device shown in FIG29;

[0093] Figure 31 is a schematic structural diagram of the housing provided in some embodiments of the present application.

[0094] Icons: 1-housing; 11-shell; 12-end cap; 13-first wall; 14-second wall; 15-third wall; 16-mouth; 2-electrode assembly; 21-first tab; 22-second tab; 23-main body; 3-first electrode terminal; 4-second electrode terminal; 5-first current collecting member; 51-first avoidance area; 52-first connecting portion; 53-first protrusion; 54-third connecting portion; 6-second current collecting member; 61-second avoidance area; 62-second connecting portion; 63-second protrusion; 64-fourth connecting portion Part; 71-first insulating member; 72-second insulating member; 73-third insulating member; 731-first card slot; 732-second card slot; 74-fourth insulating member; 8-partitioning device; 81-subspace; 82-partition wall; 821-accommodating chamber; 83-accommodating unit; 9-thermal management component; 10-battery cell; 20-housing; 201-first part; 202-second part; 100-battery; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The term "plurality" used in this application refers to two or more (including two).

[0101] 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.

[0102] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0103] 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, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0104] 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.

[0105] 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.

[0106] 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.).

[0107] 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 modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used singly or in combination of two or more.

[0108] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0109] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0110] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, the metal foil may include aluminum with a silver coating on the surface, stainless steel with a silver coating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam. The composite current collector may include a polymer 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, or silver alloy, etc.) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0122] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0123] 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.

[0124] 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.

[0125] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0126] 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.

[0127] In some embodiments, the electrode assembly is a laminate structure.

[0128] 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.

[0129] 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.

[0130] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0131] 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.

[0132] 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.

[0133] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0134] 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.

[0135] 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.

[0136] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] Batteries typically consist of multiple cells, which are typically connected in series, parallel, or in a hybrid configuration. Currently, cell sizes and capacities are relatively small. To meet higher capacity requirements, more cells are needed. This increase in cells also increases the number of components required to connect these cells, requiring more battery management systems and wiring, and ultimately increasing battery costs. To reduce costs, the cell capacity can be increased, thereby reducing the number of cells in the battery.

[0142] For general large-capacity battery cells, the volume of the battery cell shell and the capacity of the battery cell are not reasonably designed, making it difficult to take into account both the economy and energy density requirements of the battery cell.

[0143] In view of this, the embodiment of the present application provides a battery cell, the volume of the shell is V, the capacity of the battery cell is C, 1.4dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah. This prevents the battery cell from being too small and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and achieving better economic efficiency. It also prevents the battery cell from being too large and too small in capacity, thereby improving the volume energy density of large-capacity battery cells, thus balancing the economic efficiency and energy density requirements of the battery cell.

[0144] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0145] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0146] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0147] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed within vehicle 1000. Battery 100 can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000, for example, as an operating power source for vehicle 1000.

[0148] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0149] In some embodiments of the present application, the battery 100 can not only serve as the operating 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.

[0150] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a battery cell 10 and a housing 20, wherein the battery cell 10 is accommodated in the housing 20.

[0151] The housing 20 is a component that houses the battery cells 10 and provides a storage space for the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202, which overlap to define a storage space for the battery cells 10. The first portion 201 and the second portion 202 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 201 can be a hollow structure with one side open, and the second portion 202 can be a hollow structure with one side open. The open side of the second portion 202 overlaps the open side of the first portion 201, thereby forming the housing 20 with a storage space. Alternatively, the first portion 201 can be a hollow structure with one side open, and the second portion 202 can be a plate-like structure. The second portion 202 overlaps the open side of the first portion 201, thereby forming the housing 20 with a storage space. The first portion 201 and the second portion 202 can be sealed by a sealing element, which can be a sealing ring, sealant, etc.

[0152] In the battery 100, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection to form a battery module, which can then be connected in series, parallel, or in a hybrid connection to form a single unit and housed within the housing 20. Alternatively, all battery cells 10 can be directly connected in series, parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 10 can be housed within the housing 20.

[0153] Please refer to Figure 3, which is an exploded view of a battery cell 10 (with a first electrode tab 21 and a second electrode tab 22 disposed at the same end of a main body 23) provided in some embodiments of the present application. The battery cell 10 may include a housing 1 and an electrode assembly 2, wherein the electrode assembly 2 is housed within the housing 1.

[0154] In some embodiments, the housing 1 may include a shell 11 and an end cover 12 , wherein the shell 11 has an opening and the end cover 12 closes the opening of the shell 11 .

[0155] The housing 11 is a component for accommodating the electrode assembly 2. The housing 11 can be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The housing 11 can have various shapes, such as a cylinder or a rectangular parallelepiped. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0156] The end cap 12 is a component that closes the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the shell 11 together define a storage space for accommodating the electrode assembly 2, electrolyte, etc. The end cap 12 can be connected to the shell 11 by welding or rolling to close the opening of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0157] In an embodiment where one end of the housing 11 is opened, one end cap 12 may be provided. In an embodiment where both ends of the housing 11 are opened, two end caps 12 may be provided. The two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define a storage space.

[0158] The electrode assembly 2 can be a laminated structure or a wound structure.

[0159] In some embodiments, the battery cell 10 may further include electrode terminals, which are disposed on the outer casing 1 and are used to electrically connect to the tabs of the electrode assembly 2 to output electrical energy from the battery cell 10. The electrode terminals may be disposed on the shell 11 of the outer casing 1 or on the end cap 12 of the outer casing 1. The electrode terminals may be directly connected to the tabs, for example, by welding the electrode terminals to the tabs. The electrode terminals may also be indirectly connected to the tabs, for example, by connecting the electrode terminals to the tabs through a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0160] As an example, as shown in Figure 3, along the first direction X, one end of the housing 11 is formed with an opening. A single end cap 12 is provided in the housing 1, sealing the opening of the housing 11. Multiple electrode assemblies 2 are provided, arranged along the second direction Y. The end cap 12 is provided with a first electrode terminal 3 and a second electrode terminal 4. The first electrode terminal 3 and the second electrode terminal 4 are arranged along the third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. Along the first direction X, the end of the electrode assembly 2 facing the end cap 12 is formed with a first electrode tab 21 and a second electrode tab 22. The first electrode tab 21 and the second electrode tab 22 have opposite polarities. The first electrode tab 21 is electrically connected to the first electrode terminal 3 via a first current collecting member 5. The second electrode tab 22 is electrically connected to the second electrode terminal 4 via a second current collecting member 6.

[0161] The present invention provides a battery cell 10. Please refer to Figure 3 and Figure 4. Figure 4 is an assembly diagram of the battery cell 10 shown in Figure 3. It includes a housing 1 and an electrode assembly 2. The electrode assembly 2 is accommodated in the housing 1. The volume of the housing 1 is V. The capacitance of the battery cell 10 is C. It satisfies the following requirements: 1.4dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah.

[0162] The outer shell 1 can be cylindrical, prismatic, etc. Among them, prisms include triangular prisms, quadrangular prisms, pentagonal prisms, hexagonal prisms, etc. Quadrangular prisms include rectangular parallelepipeds, cubes, etc. There can be one or more electrode assemblies 2 in the outer shell 1. If there are multiple electrode assemblies 2 in the outer shell 1, the multiple electrode assemblies 2 can be distributed in an array, and the multiple electrode assemblies 2 can be arranged in a row or in multiple rows, with multiple electrode assemblies 2 in each row of electrode assemblies 2.

[0163] The volume of the housing 1 of the battery cell 10 can be measured in a variety of ways. For a regularly shaped housing 1, taking a rectangular parallelepiped as an example, the length L, width W, and height H of the housing 1 can be measured separately by a measuring tool, and the volume of the housing 1 can be calculated based on the measured length L, width W, and height H of the housing 1. It can be understood that V = L × W × H. For a rectangular parallelepiped housing 1, the housing 1 includes six walls. If the outer surfaces of the six walls of the housing 1 are all flat, the length, width, and height of the housing 1 are measured based on the outer surfaces of each wall. If one or more walls of the housing 1 have convex or concave portions formed on their outer surfaces, the length L, width W, and height H of the housing 1 are measured based on the planar area of ​​the outer surface (the area outside the convex or concave portion). For a cylindrical housing 1 as an example, the length (axial dimension of the housing 1) L and diameter D of the housing 1 can be measured separately by a measuring tool, and the volume of the housing 1 can be calculated based on the measured length L and diameter D of the housing 1. It can be understood that V = πD 2 × L / 4. A vernier caliper may be used as the measuring tool. For example, in FIG3 , the first direction X is parallel to the height direction of the housing 1 , the second direction Y is parallel to the length direction of the housing 1 , and the third direction Z is parallel to the width direction of the housing 1 .

[0164] For irregularly shaped housings 1, the volume of the housing 1 can be measured using the immersion method. The specific method is as follows: Liquid is poured into a measuring container, and the volume value X1 corresponding to the liquid level is recorded. For example, with the first electrode terminal 3 and the second electrode terminal 4 of the battery cell 10 located at the same end of the housing 1, the battery cell 10 is gradually immersed in the liquid with the first electrode terminal 3 and the second electrode terminal 4 facing upward until the top surface of the battery cell 10 is flush with the liquid level. At this point, the first electrode terminal 3 and the second electrode terminal 4 are not immersed in the liquid. The volume value X2 corresponding to the liquid level at this point is recorded, where V = X2 - X1.

[0165] The unit of V is dm 3 (cubic decimeter), V can be taken as 1.4dm 3 , 2dm 3 , 5dm 3 , 8dm 3 、10dm 3 、12dm 3 , 15dm 3 、18dm 3 , 20dm 3 , 22dm 3 , 25dm 3 、28dm 3 、30dm 3 、32dm 3 、35dm3 、37dm 3 、40dm 3 、42dm 3 、45dm 3 、48dm 3 50dm 3 , 52dm 3 、55dm 3 、58dm 3 、60dm 3 、62dm 3 、65dm 3 Any point value or any range of values ​​between the two.

[0166] The unit of C is Ah (ampere-hour). C can be any point value among 400Ah, 500Ah, 800Ah, 1000Ah, 1200Ah, 1500Ah, 1800Ah, 2000Ah, 2200Ah, 2500Ah, 2800Ah, 3000Ah, 3200Ah, 3500Ah, 3800Ah, 4000Ah, 4200Ah, 4500Ah, 4800Ah, 5000Ah, etc., or a range value between any two of them.

[0167] In this embodiment, 1.4dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah. Under the same chemical system, the battery cell 10 will not be too small in size and too large in capacity, thereby reducing the manufacturing difficulty and cost of the large-capacity battery cell 10 and having better economy. The battery cell 10 will not be too large in size and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10, thus taking into account the economy and energy density requirements of the battery cell 10.

[0168] In some embodiments, the positive electrode material of the battery cell 10 includes lithium phosphate, 400Ah≤C≤5000Ah, 2.5dm 3 ≤V≤46dm 3 .

[0169] V can be 2.5dm 3 、3dm 3 , 5dm 3 , 8dm 3 、10dm 3 、12dm 3 , 15dm 3 、18dm 3 , 20dm 3 , 22dm 3 , 25dm 3、28dm 3 、30dm 3 、32dm 3 、35dm 3 、38dm 3 、40dm 3 、42dm 3 、45dm 3 、46dm 3 Any point value or any range of values ​​between the two.

[0170] Lithium-containing phosphates 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.

[0171] For a battery cell 10 whose positive electrode material includes lithium phosphate, the volume of the housing 1 is controlled within 2.5 dm 3 ~46dm 3 , which can further reduce the manufacturing cost of the large-capacity battery cell 10 and improve the volume energy density of the large-capacity battery cell 10, further taking into account the economy and energy density requirements of the battery cell 10.

[0172] In some embodiments, 400Ah≤C≤1500Ah, 2.5dm 3 ≤V≤13.8dm 3 .

[0173] V can be 2.5dm 3 、3dm 3 , 3.5dm 3 、4dm 3 , 4.5dm 3 , 5dm 3 5.5dm 3 , 6dm 3 , 6.5dm 3 , 7dm 3 , 7.5dm 3 , 8dm 3 , 8.5dm 3 , 9dm 3 , 9.5dm 3 、10dm 3 、10.5dm 3 , 11dm 3 , 11.5dm 3 、12dm 3 , 12.5dm 3 、13.5dm 3、13.8dm 3 Any point value or any range of values ​​between the two.

[0174] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range of values ​​between any two of them.

[0175] In this embodiment, 400Ah≤C≤1500Ah, 2.5dm 3 ≤V≤13.8dm 3 , so that the volume and capacity of the battery cell 10 including the positive electrode material containing lithium phosphate are more matched, and the battery cell 10 of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0176] In some embodiments, 1500Ah<C≤3000Ah, 9.6dm 3 ≤V≤27.6dm 3 .

[0177] V can be 9.6dm 3 、10dm 3 、10.5dm 3 , 11dm 3 , 11.5dm 3 、12dm 3 , 12.5dm 3 、13dm 3 、13.5dm 3 、14dm 3 、14.5dm 3 , 15dm 3 , 15.5dm 3 、16dm 3 、16.5dm 3 、17dm 3 , 17.5dm 3 、18dm 3 、18.5dm 3 、19dm 3 、19.5dm 3 , 20dm 3 , 20.5dm 3 , 21dm 3 、 21.5dm 3, 22dm 3 , 22.5dm 3 , 23.5dm 3 、24dm 3 、24.5dm 3 , 25dm 3 , 25.5dm 3 、26dm 3 、26.5dm 3 、27dm 3 、27.6dm 3 Any point value or any range of values ​​between the two.

[0178] C can be any point value among 1550Ah, 1600Ah, 1700Ah, 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, etc., or a range value between any two of them.

[0179] In this embodiment, 1500Ah<C≤3000Ah, 9.6dm 3 ≤V≤27.6dm 3 , so that the volume and capacity of the battery cell 10 including the positive electrode material containing lithium phosphate are more matched, and the battery cell 10 of 1500Ah<C≤3000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0180] In some embodiments, 3000Ah<C≤5000Ah, 19.3dm 3 ≤V≤46dm 3 .

[0181] V can be 19.3dm 3 、19.5dm 3 , 20dm 3 , 20.5dm 3 , 21dm 3 , 21.5dm 3 , 22dm 3 , 21.5dm 3 , 22dm 3 , 22.5dm 3 , 23dm 3 , 23.5dm 3 、24dm 3、24.5dm 3 , 25dm 3 , 25.5dm 3 、26dm 3 、26.5dm 3 、27dm 3 , 27.5dm 3 、28dm 3 、28.5dm 3 、29dm 3 、29.5dm 3 、30dm 3 、30.5dm 3 、31dm 3 、32.5dm 3 、33dm 3 、33.5dm 3 、34dm 3 、34.5dm 3 、35dm 3 、35.5dm 3 、36dm 3 、36.5dm 3 、37dm 3 、37.5dm 3 、38dm 3 、38.5dm 3 、39dm 3 、39.5dm 3 、40dm 3 、40.5dm 3 , 41dm 3 41.5dm 3 、42dm 3 42.5dm 3 、43dm 3 43.5dm 3 、44dm 3 、44.5dm 3 、45dm 3 45.5dm 3 、46dm 3 Any point value or any range of values ​​between the two.

[0182] C can take any point value among 3050Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, 4100Ah, 4200Ah, 4300Ah, 4400Ah, 4500Ah, 4600Ah, 4700Ah, 4800Ah, 4900Ah, 5000Ah, etc., or a range of values ​​between any two of them.

[0183] In this embodiment, 3000Ah<C≤5000Ah, 19.3dm 3 ≤V≤46dm 3 , so that the volume and capacity of the battery cell 10 including the positive electrode material containing lithium phosphate are more matched, and the battery cell 10 of 3000Ah<C≤5000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0184] In some embodiments, the positive electrode material of the battery cell 10 includes lithium transition metal oxide, 400Ah≤C≤5000Ah, 1.4dm 3 ≤V≤40.6dm 3 .

[0185] V can be 1.4dm 3 , 2.5dm 3 、3dm 3 、4dm 3 , 5dm 3 , 6dm 3 , 7dm 3 , 8dm 3 , 9dm 3 、10dm 3 , 11dm 3 、12dm 3 、13dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 , 20dm 3 , 22dm 3 , 23dm 3 、24dm 3 , 25dm 3 、26dm 3 、27dm3 、28dm 3 、29dm 3 、30dm 3 、31dm 3 、32dm 3 、33dm 3 、34dm 3 、35dm 3 、36dm 3 、37dm 3 、38dm 3 、39dm 3 、40dm 3 、40.6dm 3 Any point value or any range of values ​​between the two.

[0186] Lithium transition metal oxides 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 0.05 O2) and at least one of its modified compounds, etc.

[0187] For a battery cell 10 whose positive electrode material includes lithium transition metal oxide, the volume of the housing 1 is controlled within 1.4 dm 3 ~40.6dm 3, which can further reduce the manufacturing cost of the large-capacity battery cell 10 and improve the volume energy density of the large-capacity battery cell 10, further taking into account the economy and energy density requirements of the battery cell 10.

[0188] In some embodiments, 400Ah≤C≤1500Ah, 1.4dm 3 ≤V≤12.2dm 3 .

[0189] V can be 1.4dm 3 , 1.5dm 3 , 2dm 3 , 2.5dm 3 、3dm 3 , 3.5dm 3 、4dm 3 , 4.5dm 3 , 5dm 3 5.5dm 3 , 6dm 3 , 6.5dm 3 , 7dm 3 , 7.5dm 3 , 8dm 3 , 8.5dm 3 , 9dm 3 , 9.5dm 3 、10dm 3 、10.5dm 3 , 11dm 3 , 11.5dm 3 、12dm 3 , 12.2dm 3 Any point value or any range of values ​​between the two.

[0190] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range of values ​​between any two of them.

[0191] In this embodiment, 400Ah≤C≤1500Ah, 1.4dm 3 ≤V≤12.2dm 3, so that the volume and capacity of the battery cell 10 whose positive electrode material includes lithium transition metal oxide are more matched, the battery cell 10 of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0192] In some embodiments, 1500Ah<C≤3000Ah, 6.2dm 3 ≤V≤24.4dm 3 .

[0193] V can be 6.2dm 3 , 7dm 3 , 8dm 3 , 9dm 3 、10dm 3 , 11dm 3 、12dm 3 、13dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 , 20dm 3 , 21dm 3 , 22dm 3 , 23dm 3 、24dm 3 、24.4dm 3 Any point value or any range of values ​​between the two.

[0194] C can be any point value among 1550Ah, 1600Ah, 1700Ah, 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, etc., or a range value between any two of them.

[0195] In this embodiment, 1500Ah<C≤3000Ah, 6.2dm 3 ≤V≤24.4dm 3, so that the volume and capacity of the battery cell 10 whose positive electrode material includes lithium transition metal oxide are more matched, the battery cell 10 of 1500Ah<C≤3000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0196] In some embodiments, 3000Ah<C≤5000Ah, 12.4dm 3 ≤V≤40.6dm 3 .

[0197] V can be 12.4dm 3 、13dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 , 20dm 3 , 21dm 3 , 22dm 3 , 23dm 3 、24dm 3 , 25dm 3 、26dm 3 、27dm 3 、28dm 3 、29dm 3 、30dm 3 、31dm 3 、32dm 3 、33dm 3 、34dm 3 、35dm 3 、36dm 3 、37dm 3 、38dm 3 、39dm 3 、40dm 3 、40.6dm 3 Any point value or any range of values ​​between the two.

[0198] C can be any point value among 3050Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, 4100Ah, 4200Ah, 4300Ah, 4400Ah, 4500Ah, 4600Ah, 4700Ah, 4800Ah, 4900Ah, 5000Ah, etc., or a range of values ​​between any two of them.

[0199] In this embodiment, 3000Ah<C≤5000Ah, 12.4dm 3 ≤V≤40.6dm 3 , so that the volume and capacity of the battery cell 10 whose positive electrode material includes lithium transition metal oxide are more matched, the battery cell 10 of 3000Ah<C≤5000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0200] In some embodiments, the battery cell 10 is a sodium battery, 400Ah≤C≤5000Ah, 3.5dm 3 ≤V≤65dm 3 .

[0201] Sodium batteries can be sodium ion batteries, sodium lithium ion batteries, sodium metal batteries, etc.

[0202] V can be 3.5dm 3 、4dm 3 , 5dm 3 , 6dm 3 , 7dm 3 , 8dm 3 , 9dm 3 、10dm 3 , 11dm 3 、12dm 3 、13dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 , 20dm 3 , 22dm 3 , 23dm 3 、24dm 3 , 25dm 3 、26dm 3、27dm 3 、28dm 3 、29dm 3 、30dm 3 、31dm 3 、32dm 3 、33dm 3 、34dm 3 、35dm 3 、36dm 3 、37dm 3 、38dm 3 、39dm 3 、40dm 3 , 41dm 3 、42dm 3 、43dm 3 、44dm 3 、45dm 3 、46dm 3 、47dm 3 、48dm 3 、49dm 3 50dm 3 , 51dm 3 , 52dm 3 、53dm 3 、54dm 3 、55dm 3 56dm 3 、57dm 3 、58dm 3 , 59dm 3 、60dm 3 , 61dm 3 、62dm 3 、63dm 3 、64dm 3 、65dm 3 Any point value or any range of values ​​between the two.

[0203] For sodium batteries, the volume of the housing 1 is controlled within 3.5 dm 3 ~65dm 3 , which can further reduce the manufacturing cost of the large-capacity battery cell 10 and improve the volume energy density of the large-capacity battery cell 10, further taking into account the economy and energy density requirements of the battery cell 10.

[0204] In some embodiments, 400Ah≤C≤1500Ah, 3.5dm 3 ≤V≤19.4dm 3 .

[0205] V can be 3.5dm3 、4dm 3 , 5dm 3 , 6dm 3 , 7dm 3 , 8dm 3 , 9dm 3 、10dm 3 , 11dm 3 、12dm 3 、13dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 、19.4dm 3 Any point value or any range of values ​​between the two.

[0206] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range of values ​​between any two of them.

[0207] In this embodiment, 400Ah≤C≤1500Ah, 3.5dm 3 ≤V≤19.4dm 3 , so that the volume and capacity of the sodium battery are more matched, and the battery cell 10 of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0208] In some embodiments, 1500Ah<C≤3000Ah, 13.8dm 3 ≤V≤38.7dm 3 .

[0209] V can be 13.8dm 3 、14dm 3 , 15dm 3 、16dm 3 、17dm 3 、18dm 3 、19dm 3 , 20dm 3 , 21dm 3 , 22dm 3 , 23dm3 、24dm 3 , 25dm 3 、26dm 3 、27dm 3 、28dm 3 、29dm 3 、30dm 3 、31dm 3 、32dm 3 、33dm 3 、34dm 3 、35dm 3 、36dm 3 、37dm 3 、38dm 3 、38.7dm 3 Any point value or any range of values ​​between the two.

[0210] C can be any point value among 1550Ah, 1600Ah, 1700Ah, 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, etc., or a range value between any two of them.

[0211] In this embodiment, 1500Ah<C≤3000Ah, 13.8dm 3 ≤V≤38.7dm 3 , so that the volume and capacity of the sodium battery are more matched, and the battery cell 10 of 1500Ah<C≤3000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0212] In some embodiments, 3000Ah<C≤5000Ah, 27.6dm 3 ≤V≤65dm 3 .

[0213] V can be 27.6dm 3 、28dm 3 、28.5dm 3 、29dm 3 、29.5dm 3 、30dm 3 、31.5dm 3 、32dm 3 、32.5dm 3、33dm 3 、34dm 3 、35dm 3 、36dm 3 、37dm 3 、38dm 3 、39dm 3 、40dm 3 , 41dm 3 、42dm 3 、43dm 3 、44dm 3 、45dm 3 、46dm 3 、47dm 3 、48dm 3 、49dm 3 50dm 3 , 51dm 3 , 52dm 3 、53dm 3 、54dm 3 、55dm 3 56dm 3 、57dm 3 、58dm 3 , 59dm 3 、60dm 3 , 61dm 3 、62dm 3 、63dm 3 、64dm 3 、65dm 3 Any point value or any range of values ​​between the two.

[0214] C can take any point value among 3050Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, 4100Ah, 4200Ah, 4300Ah, 4400Ah, 4500Ah, 4600Ah, 4700Ah, 4800Ah, 4900Ah, 5000Ah, etc., or a range of values ​​between any two of them.

[0215] In this embodiment, 3000Ah<C≤5000Ah, 27.6dm 3 ≤V≤65dm 3, so that the volume and capacity of the sodium battery are more matched, and the battery cell 10 of 3000Ah<C≤5000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10.

[0216] In some embodiments, the housing 1 is in the shape of a rectangular parallelepiped, with a length of L, a width of W, and a height of H, satisfying the following conditions: 1.2 dm ≤ L ≤ 15 dm, 0.2 dm ≤ W ≤ 20 dm, and 0.6 ≤ H ≤ 5 dm. The units of L, W, and H are dm (decimeter).

[0217] L can be any point value among 1.2dm, 1.5dm, 2dm, 3dm, 4dm, 5dm, 6dm, 7dm, 8dm, 9dm, 10dm, 11dm, 12dm, 13dm, 14dm, 15dm, etc., or a range of values ​​between any two of them.

[0218] W can be any point value among 0.2dm, 0.5dm, 1dm, 2dm, 3dm, 4dm, 5dm, 6dm, 7dm, 8dm, 9dm, 10dm, 11dm, 12dm, 13dm, 14dm, 15dm, 16dm, 17dm, 18dm, 19dm, 20dm, etc., or a range of values ​​between any two of them.

[0219] H can be any point value among 0.6dm, 0.8dm, 1dm, 1.5dm, 1.8dm, 2dm, 2.5dm, 2.8dm, 3dm, 3.5dm, 4dm, 4.5dm, 5dm, etc., or a range of values ​​between any two of them.

[0220] In some embodiments, the volume of the electrode assembly 2 is V1, the number of electrode assemblies 2 accommodated in the housing 1 is N, and the following conditions are met: 0.2 dm 3 ≤V1≤7.8dm 3 , N≥5.

[0221] The electrode assembly 2 can be cylindrical or flat. If the electrode assembly is cylindrical, the length (axial dimension of the electrode assembly) L1 and diameter D1 of the electrode assembly can be measured by a measuring tool, and the length L1 and diameter D1 of the electrode assembly can be measured according to V1=πD1. 2×L1 / 4 to calculate the volume of the electrode assembly. If the electrode assembly is flat and the electrode assembly is a laminated structure, the length L1, width W1 and thickness H1 of the electrode assembly can be measured by a measuring tool, and the volume of the electrode assembly can be calculated according to V1=L1×W1×H1. If the electrode assembly is flat and the electrode assembly is a winding structure, the electrode assembly includes a straight area and bending areas at both ends of the straight area, and the two bending areas are arranged along the width direction of the electrode assembly. The length direction of the electrode assembly is parallel to the winding axis of the electrode assembly. The sum of the volume of the two bending areas and the volume of the straight area is the volume V1 of the electrode assembly. The length L1, width W1 and thickness H1 of the electrode assembly can be measured by a measuring tool. The volume of the bending area V2=πH1 2 ×L1 / 8, the volume of the flat area V3 = L1×(W1-H1)×H1, V1 = 2V2+V3.

[0222] V1 can take 0.2dm 3 , 0.5dm 3 , 0.8dm 3 , 1dm 3 , 1.2dm 3 , 1.5dm 3 , 1.8dm 3 , 2dm 3 , 3.2dm 3 , 3.5dm 3 , 3.8dm 3 、4dm 3 , 4.2dm 3 , 4.5dm 3 , 4.8dm 3 , 5dm 3 5.2dm 3 5.5dm 3 , 5.8dm 3 , 6dm 3 , 6.2dm 3 , 6.5dm 3 、6.8dm 3 , 7dm 3 , 7.2dm 3 , 7.5dm 3 , 7.8dm 3 Any point value or any range of values ​​between the two.

[0223] N can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or more.

[0224] In this embodiment, the N electrode assemblies 2 within the housing 1 can be arranged in an array. The multiple electrode assemblies 2 can be arranged in a row or in multiple rows, with each row containing multiple electrode assemblies 2. As an example, in Figure 3, N electrode assemblies 2 are arranged in a row, arranged along the second direction Y. The electrode assemblies 2 are flat, and the second direction Y is parallel to the thickness of the electrode assemblies 2. The flat electrode assemblies 2 can be either laminated or wound. The thickness of the flat electrode assembly 2 can be less than the width and length of the electrode assembly 2, and the first and second tabs 21, 22 can be located in the width direction of the electrode assembly 2. If the electrode assembly 2 is a laminated structure, the stacking direction of the electrode sheets in the electrode assembly 2 is parallel to the thickness direction of the electrode assembly 2; if the electrode assembly 2 is a wound structure, the stacking direction of the electrode sheets in the flat region is parallel to the thickness direction of the electrode assembly 2.

[0225] In this embodiment, the volume of the electrode assembly 2 is controlled to be 0.2 dm 3 ~7.8dm 3 , which can reduce the manufacturing difficulty and manufacturing cost of the electrode assembly 2. And N≥5 can achieve the large capacity requirement of the battery cell 10. In other words, 0.2dm 3 ≤V1≤7.8dm 3 , N≥5 can not only reduce the manufacturing difficulty and manufacturing cost of the electrode assembly 2, but also meet the large capacity requirement of the battery cell 10.

[0226] In some embodiments, please refer to Figures 5-7. Figure 5 is a schematic structural diagram of a battery cell 10 (with a first electrode tab 21 and a second electrode tab 22 disposed at the same end of a main body 23) according to another embodiment of the present application; Figure 6 is a schematic structural diagram of the electrode assembly 2 shown in Figure 5; and Figure 7 is an assembly diagram of the electrode assembly 2, first current collecting member 5, and second current collecting member 6 shown in Figure 5. The electrode assembly 2 includes a main body 23, a first electrode tab 21, and a second electrode tab 22. The first and second electrode tabs 21, 22 have opposite polarities and are disposed on the main body 23. The battery cell 10 includes a first current collecting member 5, a second current collecting member 6, and a plurality of electrode assemblies 2. Along a first direction X, the first electrode tabs 21 and the second electrode tabs 22 of the plurality of electrode assemblies 2 are located at the same end of the main body 23. The first current collecting member 5 connects the first electrode tabs 21 of the plurality of electrode assemblies 2, and the second current collecting member 6 connects the second electrode tabs 22 of the plurality of electrode assemblies 2.

[0227] One of the first and second tabs 21, 22 is a positive tab, and the other is a negative tab. The main body 23 may be the portion of the electrode assembly 2 corresponding to the area where the electrode sheet is coated with the active material layer. The positive tab may be the portion of the positive electrode sheet not coated with the positive active material layer, and the negative tab may be the portion of the negative electrode sheet not coated with the negative active material layer. The first and second tabs 21, 22 may be disposed at the same end of the main body 23 along the first direction X, and the first and second current collecting members 5, 6 may be disposed on the same side of the main body 23 along the first direction X. Alternatively, the first and second tabs 21, 22 may be disposed at opposite ends of the main body 23 along the first direction X, and the first and second current collecting members 5, 6 may be disposed on opposite sides of the main body 23 along the first direction X. For example, in the case of a rectangular parallelepiped housing 1, any one of the length, width, or height of the housing 1 may be parallel to the first direction X.

[0228] The first current collecting member 5 may be partially located inside the housing 1 and partially located outside the housing 1, or entirely located inside the housing 1 or entirely located outside the housing 1. The second current collecting member 6 may be partially located inside the housing 1 and partially located outside the housing 1, or entirely located inside the housing 1 or entirely located outside the housing 1. The first and second current collecting members 5, 6 are both conductors and can be made of the same or different materials. The first current collecting member 5 can be made of copper, iron, aluminum, steel, an aluminum alloy, etc., while the second current collecting member 6 can be made of copper, iron, aluminum, steel, an aluminum alloy, etc. The first and second current collecting members 5, 6 can be sheet-like structures. The first tabs 21 of all electrode assemblies 2 are located at the same end of the main body 23 along the first direction X and are connected to the first current collecting member 5. The second tabs 22 of all electrode assemblies 2 are located at the same end of the main body 23 along the first direction X and are connected to the second current collecting member 6. The first electrode tab 21 and the first current collecting member 5 can be connected to each other in various ways to achieve electrical connection between the first electrode tab 21 and the first current collecting member 5, such as welding, conductive adhesive bonding, etc. The second electrode tab 22 and the second current collecting member 6 can be connected to each other in various ways to achieve electrical connection between the second electrode tab 22 and the second current collecting member 6, such as welding, conductive adhesive bonding, etc.

[0229] In this embodiment, the first pole tabs 21 of the plurality of electrode assemblies 2 are connected by the first current collecting component 5, thereby realizing the convergence of the first pole tabs 21 of the plurality of electrode assemblies 2, and the second pole tabs 22 of the plurality of electrode assemblies 2 are connected by the second current collecting component 6, thereby realizing the convergence of the second pole tabs 22 of the plurality of electrode assemblies 2. There is no need to increase the volume of a single electrode assembly 2, thereby reducing the manufacturing difficulty of a large-capacity battery cell 10.

[0230] In some embodiments, please continue to refer to Figure 7. Along the first direction X, at least a portion of the first current collecting member 5 is located on the side of the main body 23 where the first electrode tab 21 is provided, and a portion of the first electrode tab 21 is located on the side of the first current collecting member 5 away from the main body 23 and is connected to the first current collecting member 5.

[0231] It is understood that, along the first direction X, at least a portion of the first current collecting member 5 and the first electrode tab 21 are located on the same side of the main body 23. The first current collecting member 5 may be entirely located on the side of the main body 23 where the first electrode tab 21 is provided, or only a portion of the first current collecting member 5 may be located on the side of the main body 23 where the first electrode tab 21 is provided.

[0232] Along the first direction X, a portion of the first electrode tab 21 is located on a side of the first current collecting member 5 facing away from the main body 23 and is connected to the first current collecting member 5, such that the first electrode tab 21 is connected to the side of the first current collecting member 5 facing away from the main body 23. Alternatively, the first electrode tab 21 may extend from the side of the first current collecting member 5 facing the main body 23, around the edge of the first current collecting member 5, and then connect to the side of the first current collecting member 5 facing away from the main body 23. Alternatively, a passage for the first electrode tab 21 may be provided in the first current collecting member 5, such that the first electrode tab 21 passes through the first current collecting member 5 and then connects to the side of the first current collecting member 5 facing away from the main body 23.

[0233] In this embodiment, by disposing at least a portion of the first current collecting member 5 on the side of the main body 23 where the first tab 21 is disposed, the connection between the first current collecting member 5 and the first tab 21 is facilitated, thereby reducing the difficulty of assembling the first current collecting member 5 and the first tab 21. Furthermore, by disposing a portion of the first tab 21 on the side of the first current collecting member 5 facing away from the main body 23 in the first direction X and connecting this portion to the first current collecting member 5, the first tab 21 bypasses the first current collecting member 5 and connects to the side of the first current collecting member 5 facing away from the main body 23. This not only reduces the difficulty of connecting the first tab 21 to the first current collecting member 5, but also reduces the phenomenon of the first current collecting member 5 pressing down on the first tab 21 toward the main body 23, thereby reducing the risk of shorting caused by the first tab 21 being inserted upside down into the main body 23.

[0234] In some embodiments, please continue to refer to Figure 7. A first avoidance area 51 is provided on the first current collecting member 5. The first avoidance area 51 penetrates the first current collecting member 5 along the first direction X. The first electrode tab 21 passes through the first avoidance area 51 and is connected to the side of the first current collecting member 5 away from the main body 23.

[0235] The first avoidance area 51 penetrates the first current collecting member 5 along the first direction X. That is, the first avoidance area 51 extends to two opposite surfaces of the first current collecting member 5 along the first direction X.

[0236] It is possible that only one first avoidance area 51 is provided on the first current collecting component 5, and the first pole tabs 21 of multiple electrode assemblies 2 all pass through the first current collecting component 5 through the same first avoidance area 51 and then are connected to the side of the first current collecting component 5 facing away from the main body 23. It is also possible that a first avoidance area 51 is provided on the first current collecting component 5 corresponding to the first pole tab 21 of each electrode assembly 2. It is also possible that multiple first avoidance areas 51 are provided on the first current collecting component 5, and each first avoidance area 51 can allow the first pole tab 21 of one electrode assembly 2 or the first pole tabs 21 of multiple electrode assemblies 2 to pass through.

[0237] As an example, as shown in Figure 7 , multiple electrode assemblies 2 are arranged along the second direction Y, and first current collecting members 5 and second current collecting members 6 are arranged along the third direction Z. The first direction X, second direction Y, and third direction Z are non-coplanar and intersect with each other. A row of first avoidance areas 51 is provided on the first current collecting member 5 corresponding to the first tabs 21 of the multiple electrode assemblies 2. Each row of first avoidance areas 51 includes multiple first avoidance areas 51 spaced apart along the second direction Y. The first tabs 21 of two adjacent electrode assemblies 2 in the multiple electrode assemblies 2 pass through a first avoidance area 51, then pass through the first current collecting member 5 and connect to the side of the first current collecting member 5 facing away from the main body 23.

[0238] Any two of the first direction X, the second direction Y, and the third direction Z may be arranged at an acute angle, a right angle, or an obtuse angle. As an example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0239] In this embodiment, a first avoidance area 51 is provided on the first current collecting member 5, and the first avoidance area 51 penetrates the first current collecting member 5 along the first direction X, so that the first pole tab 21 can pass through the first avoidance area 51 and be connected to the side of the first current collecting member 5 facing away from the main body 23. The battery cell 10 adopting this structure facilitates the first pole tab 21 to be provided as a structure connected to the side of the first current collecting member 5 facing away from the main body 23, which can reduce the difficulty of the first pole tab 21 bypassing the first current collecting member 5 and optimize the length of the first pole tab 21 bypassing the first current collecting member 5, thereby alleviating the redundancy of the first pole tab 21 and reducing the manufacturing cost of the battery cell 10.

[0240] In some embodiments, please refer to FIG8 , which is a schematic structural diagram of a first current collecting member 5 provided in some embodiments of the present application. The first avoidance area 51 is a through hole provided on the first current collecting member 5 .

[0241] The through holes penetrate the first current collecting member 5 along the first direction X. The through holes may be circular holes, polygonal holes, etc. As an example, in FIG8 , the through holes are rectangular holes. There are multiple rectangular holes, and the multiple rectangular holes on the first current collecting member 5 are arranged along the second direction Y.

[0242] In this embodiment, the first avoidance area 51 is a through hole provided on the first current collecting member 5 , so that the first electrode tab 21 passes through the first avoidance area 51 and is connected to the side of the first current collecting member 5 away from the main body 23 . The structure is simple and easy to manufacture.

[0243] In other embodiments, please refer to FIG9 , which is a schematic structural diagram of a first current collecting member 5 provided in other embodiments of the present application. The first avoidance area 51 is a notch provided at the edge of the first current collecting member 5 .

[0244] The notch penetrates the first current collecting member 5 along the first direction X, and extends to the edge of the first current collecting member 5 along the third direction Z. As an example, in FIG9 , there are multiple notches, and the multiple notches on the first current collecting member 5 are arranged along the second direction Y. The notches at both ends along the second direction Y extend to the edge of the first current collecting member 5 respectively.

[0245] In this embodiment, the first avoidance area 51 is a gap set at the edge of the first current collecting member 5, so that the first electrode tab 21 can pass through the first avoidance area 51 and connect to the side of the first current collecting member 5 away from the main body 23. The structure is simple and easy to manufacture.

[0246] In some embodiments, please continue to refer to FIG. 5 , the first current collecting component 5 is disposed in the housing 1 .

[0247] It can be understood that the first current collecting member 5 is entirely located inside the housing 1 , and has no portion located outside the housing 1 .

[0248] In this embodiment, by arranging the first current collecting member 5 inside the shell 1, it is helpful to reduce the difficulty of assembling the first electrode 21 and the first current collecting member 5, thereby improving the production efficiency of the battery cell 10, and the shell 1 can play a certain protective role on the first current collecting member 5, thereby reducing the wear or damage of the first current collecting member 5 during use.

[0249] In other embodiments, the first current collecting component 5 can also be arranged on the outside of the shell 1. Along the first direction X, the shell 1 is provided with a first channel for each first pole ear 21 to extend out. Each first pole ear 21 extends out of the shell 1 through the corresponding first channel and is connected to the first current collecting component 5.

[0250] Among them, along the first direction X, a first channel for each first electrode tab 21 to extend is provided on the side of the shell 1 close to the first electrode tab 21, that is, the area of ​​the shell 1 facing the side of the main body 23 on which the first electrode tab 21 is provided in the first direction X is provided with a first channel for the first electrode tab 21 to pass through, so that the first electrode tabs 21 of the multiple electrode assemblies 2 can extend out of the outside of the shell 1 and then be connected to the first current collecting member 5 located outside the shell 1.

[0251] As an example, the housing 1 may be provided with multiple first apertures, each corresponding to a first electrode tab 21, so that the first electrode tab 21 of each electrode assembly 2 can extend out of the housing 1 through a first aperture, which helps to reduce the interference between the first electrode tabs 21 of the multiple electrode assemblies 2. Of course, in other embodiments, the housing 1 may be provided with only one first aperture, and the first electrode tabs 21 of the multiple electrode assemblies 2 may extend out of the housing 1 through the same first aperture.

[0252] In this embodiment, by arranging the first current collecting member 5 on the outside of the shell 1, and providing a first hole for the first electrode ear 21 to pass through the shell 1, the battery cell 10 adopting this structure can, on the one hand, reduce the internal space of the shell 1 occupied by the first current collecting member 5, so as to free up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10; on the other hand, it is convenient for the later inspection of the first current collecting member 5, and it is convenient for the maintenance and replacement of the first current collecting member 5, which is beneficial to reducing the maintenance cost of the battery cell 10.

[0253] In some embodiments, please continue to refer to Figure 7. Along the first direction X, at least a portion of the second current collecting member 6 is located on the side of the main body 23 where the second electrode tab 22 is provided, and a portion of the second electrode tab 22 is located on the side of the second current collecting member 6 away from the main body 23 and is connected to the second current collecting member 6.

[0254] It is understood that, along the first direction X, at least a portion of the second current collecting member 6 and the second electrode tab 22 are located on the same side of the main body 23. The second current collecting member 6 may be entirely located on the side of the main body 23 where the second electrode tab 22 is located, or only a portion of the second current collecting member 6 may be located on the side of the main body 23 where the second electrode tab 22 is located.

[0255] Along the first direction X, a portion of the second electrode tab 22 is located on a side of the second current collecting member 6 facing away from the main body 23 and is connected to the second current collecting member 6, such that the second electrode tab 22 is connected to the side of the second current collecting member 6 facing away from the main body 23. Alternatively, the second electrode tab 22 may be provided in the second current collecting member 6 with a passage for the second electrode tab 22 to pass through, so that the second electrode tab 22 passes through the second current collecting member 6 and then connects to the side of the second current collecting member 6 facing away from the main body 23.

[0256] In this embodiment, by disposing at least a portion of the second current collecting member 6 on the side of the main body 23 where the second electrode tab 22 is disposed, the connection between the second current collecting member 6 and the second electrode tab 22 is facilitated, thereby reducing the difficulty of assembling the second current collecting member 6 and the second electrode tab 22. Furthermore, by disposing a portion of the second electrode tab 22 on the side of the second current collecting member 6 facing away from the main body 23 in the first direction X and connecting this portion to the second current collecting member 6, the second electrode tab 22 bypasses the second current collecting member 6 and connects to the side of the second current collecting member 6 facing away from the main body 23. This not only reduces the difficulty of connecting the second electrode tab 22 to the second current collecting member 6, but also reduces the phenomenon of the second current collecting member 6 pressing down on the second electrode tab 22 toward the main body 23, thereby reducing the risk of shorting caused by the second electrode tab 22 being inserted upside down into the main body 23.

[0257] In some embodiments, please continue to refer to Figure 7. A second avoidance area 61 is provided on the second current collecting member 6. The second avoidance area 61 penetrates the second current collecting member 6 along the first direction X. The second electrode tab 22 passes through the second avoidance area 61 and is connected to the side of the second current collecting member 6 away from the main body 23.

[0258] It is possible that only one second avoidance area 61 is provided on the second current collecting component 6, and the second pole tabs 22 of multiple electrode assemblies 2 all pass through the second current collecting component 6 through the same second avoidance area 61 and then are connected to the side of the second current collecting component 6 facing away from the main body 23. It is also possible that a second avoidance area 61 is provided on the second current collecting component 6 corresponding to the second pole tab 22 of each electrode assembly 2. It is also possible that multiple second avoidance areas 61 are provided on the second current collecting component 6, and each second avoidance area 61 can allow the second pole tab 22 of one electrode assembly 2 or the second pole tabs 22 of multiple electrode assemblies 2 to pass through.

[0259] As an example, as shown in Figure 7, a row of second avoidance areas 61 is provided on the second current collecting member 6 corresponding to the second pole tabs 22 of the plurality of electrode assemblies 2, and each row of second avoidance areas 61 includes a plurality of second avoidance areas 61 arranged at intervals along the second direction Y. The second pole tabs 22 of two adjacent electrode assemblies 2 among the plurality of electrode assemblies 2 pass through the second current collecting member 6 through a second avoidance area 61 and are connected to the side of the second current collecting member 6 facing away from the main body 23.

[0260] In this embodiment, a second avoidance area 61 is provided on the second current collecting member 6, and the second avoidance area 61 penetrates the second current collecting member 6 along the first direction X, so that the second pole tab 22 can pass through the second avoidance area 61 and be connected to the side of the second current collecting member 6 away from the main body 23. The battery cell 10 adopting this structure facilitates the second pole tab 22 to be provided as a structure connected to the side of the second current collecting member 6 away from the main body 23, which can reduce the difficulty of the second pole tab 22 bypassing the second current collecting member 6 and optimize the length of the second pole tab 22 bypassing the second current collecting member 6, thereby alleviating the redundancy of the second pole tab 22 and reducing the manufacturing cost of the battery cell 10.

[0261] In some embodiments, please refer to FIG10 , which is a schematic structural diagram of the second current collecting member 6 provided in some embodiments of the present application. The second avoidance area 61 is a through hole provided on the second current collecting member 6 .

[0262] The through holes penetrate the second current collecting member 6 along the first direction X. The through holes may be circular holes, polygonal holes, etc. As an example, in FIG9 , the through holes are rectangular holes. There are multiple rectangular holes, and the multiple rectangular holes on the second current collecting member 6 are arranged along the second direction Y.

[0263] In this embodiment, the second avoidance area 61 is a through hole provided on the second current collecting member 6 , so that the second electrode tab 22 can pass through the second avoidance area 61 and connect to the side of the second current collecting member 6 away from the main body 23 . The structure is simple and easy to manufacture.

[0264] In other embodiments, please refer to FIG11 , which is a schematic structural diagram of a second current collecting member 6 provided in other embodiments of the present application. The second avoidance area 61 is a notch provided at the edge of the second current collecting member 6 .

[0265] The notch penetrates the second current collecting member 6 along the first direction X, and extends to the edge of the second current collecting member 6 along the third direction Z. As an example, in FIG11 , there are multiple notches, and the multiple notches on the second current collecting member 6 are arranged along the second direction Y. The notches at both ends along the second direction Y extend to the edge of the second current collecting member 6 respectively.

[0266] In this embodiment, the second avoidance area 61 is a gap set at the edge of the second current collecting member 6, so that the second electrode tab 22 can pass through the second avoidance area 61 and connect to the side of the second current collecting member 6 away from the main body 23. The structure is simple and easy to manufacture.

[0267] In some embodiments, please continue to refer to FIG. 5 , the second current collecting component 6 is disposed in the housing 1 .

[0268] It can be understood that the second current collecting member 6 is entirely located inside the housing 1 , and has no portion located outside the housing 1 .

[0269] In this embodiment, by arranging the second current collecting member 6 inside the shell 1, it is helpful to reduce the difficulty of assembling the second electrode tab 22 and the second current collecting member 6, thereby improving the production efficiency of the battery cell 10, and the shell 1 can play a certain protective role on the second current collecting member 6, thereby reducing the wear or damage of the second current collecting member 6 during use.

[0270] In other embodiments, the second current collecting component 6 is arranged outside the shell 1, and along the first direction X, the shell 1 is provided with a second channel for each second pole ear 22 to extend out, and each second pole ear 22 extends out of the shell 1 through the corresponding second channel and is connected to the second current collecting component 6.

[0271] Among them, along the first direction X, a second channel for each second pole ear 22 to extend is provided on the side of the shell 1 close to the second pole ear 22, that is, the area of ​​the shell 1 facing the side of the main body 23 on which the second pole ear 22 is provided in the first direction X is provided with a second channel for the second pole ear 22 to pass through, so that the second pole ears 22 of the multiple electrode assemblies 2 can extend out of the outside of the shell 1 and then be connected to the second current collecting member 6 located outside the shell 1.

[0272] As an example, the housing 1 may be provided with multiple second apertures, each corresponding to a second electrode tab 22, so that the second electrode tab 22 of each electrode assembly 2 can extend out of the housing 1 through a second aperture, which helps reduce interference between the second electrode tabs 22 of the multiple electrode assemblies 2. Of course, in other embodiments, the housing 1 may be provided with only one second aperture, and the second electrode tabs 22 of the multiple electrode assemblies 2 may extend out of the housing 1 through the same second aperture.

[0273] In this embodiment, by arranging the second current collecting member 6 on the outside of the shell 1, and providing a second hole on the shell 1 for the second electrode ear 22 to pass through, the battery cell 10 adopting this structure can, on the one hand, reduce the internal space of the shell 1 occupied by the second current collecting member 6, so as to free up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10; on the other hand, it is convenient for the later inspection of the second current collecting member 6, and it is convenient for the maintenance and replacement of the second current collecting member 6, which is beneficial to reducing the maintenance cost of the battery cell 10.

[0274] In some embodiments, referring to Figures 5-7 , the first electrode tab 21 and the second electrode tab 22 are both disposed at the same end of the main body 23 along the first direction X. The first current collecting member 5 includes a first connecting portion 52 connected to each first electrode tab 21, and the second current collecting member 6 includes a second connecting portion 62 connected to each second electrode tab 22. The first connecting portion 52 and the second connecting portion 62 are both located on the side of the main body 23 in the first direction X where the first electrode tab 21 and the second electrode tab 22 are disposed, and the first connecting portion 52 and the second connecting portion 62 are spaced apart.

[0275] The first connecting portion 52 is the portion of the first current collecting member 5 located on the side of the main body 23 in the first direction X where the first electrode tab 21 is located. It serves to connect the first electrode tabs 21 of the multiple electrode assemblies 2. The first connecting portion 52 may be a portion of the first current collecting member 5, or it may be the first current collecting member 5 itself. Similarly, the second connecting portion 62 is the portion of the second current collecting member 6 located on the side of the main body 23 in the first direction X where the second electrode tab 22 is located. It serves to connect the second electrode tabs 22 of the multiple electrode assemblies 2. The second connecting portion 62 may be a portion of the second current collecting member 6, or it may be the second current collecting member 6 itself.

[0276] The first connecting portion 52 serves to connect the first tabs 21 of the plurality of electrode assemblies 2. The connection structure between the first connecting portion 52 and the first tab 21 can be various, such as welding, abutment, or conductive adhesive bonding. Similarly, the second connecting portion 62 serves to connect the second tabs 22 of the plurality of electrode assemblies 2. The connection structure between the second connecting portion 62 and the second tab 22 can be various, such as welding, abutment, or conductive adhesive bonding.

[0277] As an example, multiple electrode assemblies 2 are arranged along the second direction Y, first electrode tabs 21 and second electrode tabs 22 are arranged along the third direction Z, and first current collecting members 5 and second current collecting members 6 are located within the housing 1 and arranged 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. Each two of the first direction X, the second direction Y, and the third direction Z form a plane, and the first direction X, the second direction Y, and the third direction Z are not coplanar, that is, the three planes formed by the first direction X, the second direction Y, and the third direction Z are not coplanar.

[0278] It should be noted that in the embodiment where the first current collecting member 5 is provided with the first avoidance area 51, the first avoidance area 51 can be provided at the first connecting portion 52. In the embodiment where the second current collecting member 6 is provided with the second avoidance area 61, the second avoidance area 61 can be provided at the second connecting portion 62.

[0279] In this embodiment, the first electrode tab 21 and the second electrode tab 22 are both arranged at the same end of the main body 23 in the first direction X, and the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 are both located on the side of the main body 23 where the first electrode tab 21 and the second electrode tab 22 are arranged. On the one hand, it is convenient to connect the first current collecting member 5 with the first electrode tab 21, and to connect the second current collecting member 6 with the second electrode tab 22, which is conducive to reducing the difficulty of assembling the first current collecting member 5 and the second current collecting member 6. On the other hand, it is possible to enable the first current collecting member 5 and the second current collecting member 6 to share space in the first direction X, which is conducive to saving the space occupied by the first current collecting member 5 and the second current collecting member 6 in the first direction X, thereby improving the space utilization of the battery cell 10 and thereby increasing the volume energy density of the battery cell 10.

[0280] In some embodiments, please continue to refer to Figure 5, the battery cell 10 may include a first insulating member 71, which is arranged along the first direction X on the side of the first connecting portion 52 and the second connecting portion 62 away from the main body 23 to insulate and isolate the first connecting portion 52 and the shell 1 and the second connecting portion 62 and the shell 1.

[0281] As an example, the first insulating member 71 is located within the housing 1. Along the first direction X, the first insulating member 71 is located between the first connecting portion 52 of the first current collecting member 5 and the housing 1, and between the second connecting portion 62 of the second current collecting member 6 and the casing 11, so that the first connecting portion 52 and the second connecting portion 62 can be insulated and isolated from the housing 1 by the first insulating member 71. The first insulating member 71 is made of an insulating material, such as rubber, silicone, or plastic.

[0282] In this embodiment, the first insulating member 71 is located between the first connecting portion 52 and the second connecting portion 62 and the outer shell 1 in the first direction X. The battery cell 10 adopting this structure can, on the one hand, achieve insulation isolation between the first connecting portion 52 and the outer shell 1 and between the second connecting portion 62 and the outer shell 1, which is beneficial to reducing the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the outer shell 1. On the other hand, it can achieve that the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 share a first insulating member 71, which is beneficial to optimizing the assembly process of the battery cell 10 and reducing the manufacturing cost of the battery cell 10.

[0283] In some embodiments, please continue to refer to Figure 5, the battery cell 10 may include a second insulating member 72, which is arranged along the first direction X on the side of the first connecting portion 52 and the second connecting portion 62 facing the main body 23 to insulate and isolate the first connecting portion 52 and the main body 23 and the second connecting portion 62 and the main body 23.

[0284] As an example, the second insulating member 72 is located within the housing 1, and along the first direction X, the second insulating member 72 is located between the first connecting portion 52 and the main body 23, and between the second connecting portion 62 and the main body 23, so that the first connecting portion 52 and the main body 23, as well as the second connecting portion 62 and the main body 23, are insulated and isolated by the second insulating member 72. The second insulating member 72 is made of an insulating material, such as rubber, silicone, or plastic.

[0285] In this embodiment, the second insulating member 72 is located between the first connecting portion 52 and the second connecting portion 62 and the main body 23 in the second direction Y. The battery cell 10 adopting this structure can, on the one hand, achieve insulation isolation between the first connecting portion 52 and the main body 23 and between the second connecting portion 62 and the main body 23, which is beneficial to reducing the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the main body 23. On the other hand, it can achieve the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 sharing a second insulating member 72, which is beneficial to optimizing the assembly process of the battery cell 10 and reducing the manufacturing cost of the battery cell 10.

[0286] 5 , in some embodiments, along the first direction X, the housing 1 includes a first wall portion 13, and the first current collecting member 5 and the second current collecting member 6 are both disposed on a side of the main body 23 facing the first wall portion 13. The first wall portion 13 is provided with the first electrode terminal 3 and the second electrode terminal 4, and the first current collecting member 5 and the second current collecting member 6 are connected to the first electrode terminal 3 and the second electrode terminal 4, respectively.

[0287] Among them, the first pole ear 21 and the second pole ear 22 are both arranged at one end of the main body 23 facing the first wall portion 13 along the first direction X, and the arrangement direction of the main body 23 of the electrode assembly 2 and the first wall portion 13 and the arrangement direction of the main body 23 and the pole ears (the first pole ear 21 and the second pole ear 22) are parallel.

[0288] The first wall portion 13 is a wall portion of the housing 1 located in the first direction X and provided with the first and second electrode terminals 3 and 4. As an example, the thickness direction of the first wall portion 13 is parallel to the first direction X, and the first and second electrode terminals 3 and 4 are arranged along the third direction Z. In the embodiment where the first and second current collecting members 5 and 6 are located within the housing 1, along the first direction X, the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 are both located between the first wall portion 13 and the main body 23.

[0289] The first wall portion 13 may be the end cover 12 in the housing 1, or may be a wall portion in the shell 11 of the housing 1. In the embodiment shown in FIG5 , the first wall portion 13 is the end cover 12.

[0290] As an example, the first current collecting member 5 includes a first protrusion 53, which is provided on a surface of the first connecting portion 52 facing the first wall portion 13. The first protrusion 53 is connected to the first electrode terminal 3 to more conveniently achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second protrusion 63, which is provided on a surface of the second connecting portion 62 facing the first wall portion 13. The second protrusion 63 is connected to the second electrode terminal 4 to more conveniently achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0291] In this embodiment, by arranging the first current collecting member 5 and the second current collecting member 6 on the side of the main body 23 facing the first wall portion 13, and arranging the first electrode terminal 3 and the second electrode terminal 4 connected to the first current collecting member 5 and the second current collecting member 6 respectively on the first wall portion 13, the distance between the first electrode terminal 3 and the first electrode tab 21 and between the second electrode terminal 4 and the second electrode tab 22 can be reduced, which is conducive to reducing the size of the first current collecting member 5 and the second current collecting member 6, and reducing the current flow path from the first electrode tab 21 to the first electrode terminal 3 and from the second electrode tab 22 to the second electrode terminal 4.

[0292] In some embodiments, please refer to Figures 12-16. Figure 12 is an exploded view of a battery cell 10 (with the first electrode tab 21 and the second electrode tab 22 disposed at the same end of the main body 23) provided in further embodiments of the present application. Figure 13 is an assembled view of the battery cell 10 shown in Figure 12. Figure 14 is an assembled view of the electrode assembly 2, the first current collecting member 5, and the second current collecting member 6 shown in Figure 12. Figure 15 is a schematic structural view of the first current collecting member 5 shown in Figure 12. Figure 16 is a schematic structural view of the second current collecting member 6 shown in Figure 12. Multiple electrode assemblies 2 are arranged along a second direction Y, which intersects the first direction X. The first current collecting member 5 includes a third connecting portion 54 connected to the first connecting portion 52. The second current collecting member 6 includes a fourth connecting portion 64 connected to the second connecting portion 62. Along the second direction Y, the housing 1 includes a second wall 14. The third and fourth connecting portions 54, 64 are both located on the side of the multiple electrode assemblies 2 facing the second wall 14. The second wall portion 14 is provided with a first electrode terminal 3 and a second electrode terminal 4 , and the third connecting portion 54 and the fourth connecting portion 64 are connected to the first electrode terminal 3 and the second electrode terminal 4 , respectively.

[0293] The third connection portion 54 is a portion of the first current collecting member 5 located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14 along the second direction Y. The fourth connection portion 64 is a portion of the second current collecting member 6 located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14 along the second direction Y. In embodiments where the first current collecting member 5 and the second current collecting member 6 are located within the housing 1, along the second direction Y, the third connection portion 54 is located between the second wall portion 14 and the plurality of electrode assemblies 2, and the fourth connection portion 64 is located between the second wall portion 14 and the plurality of electrode assemblies 2.

[0294] The first connecting portion 52 and the third connecting portion 54 can be an integral structure, that is, the first connecting portion 52 and the third connecting portion 54 are integrally formed, and the first connecting portion 52 and the third connecting portion 54 can be made by an integral forming process such as stamping or casting. Of course, the first connecting portion 52 and the third connecting portion 54 can also be a split structure, that is, the first connecting portion 52 and the third connecting portion 54 are separately provided, and the first connecting portion 52 and the third connecting portion 54 can be connected by a structure such as welding connection or bolt screw connection. Similarly, the second connecting portion 62 and the fourth connecting portion 64 can be an integral structure, that is, the second connecting portion 62 and the fourth connecting portion 64 are integrally formed, and the second connecting portion 62 and the fourth connecting portion 64 can be made by an integral forming process such as stamping or casting. Of course, the second connecting portion 62 and the fourth connecting portion 64 can also be a split structure, that is, the second connecting portion 62 and the fourth connecting portion 64 are separately provided, and the second connecting portion 62 and the fourth connecting portion 64 can be connected by a structure such as welding connection or bolt screw connection.

[0295] The second wall portion 14 is a wall portion of the housing 1 located in the second direction Y and provided with the first electrode terminal 3 and the second electrode terminal 4. As an example, the thickness direction of the second wall portion 14 is parallel to the second direction Y. The housing 1 includes a first wall portion 13 disposed opposite the plurality of electrode assemblies 2 along the first direction X. The first wall portion 13 is connected to the second wall portion 14. The first current collecting member 5 and the second current collecting member 6 are located within the housing 1. Along the first direction X, the first connecting portion 52 and the second connecting portion 62 are disposed between the main body 23 of the plurality of electrode assemblies 2 and the first wall portion 13. The first insulating member 71 is disposed between the first connecting portion 52 and the first wall portion 13 and between the second connecting portion 62 and the first wall portion 13. Along the second direction Y, the third connecting portion 54 and the fourth connecting portion 64 are disposed between the main body 23 of the plurality of electrode assemblies 2 and the second wall portion 14.

[0296] The first wall portion 13 may be the end cover 12 in the housing 1 or a wall portion in the shell 11 of the housing 1. In the embodiment shown in Figures 12 and 13, the second wall portion 14 is the end cover 12.

[0297] As an example, the first current collecting member 5 includes a first protrusion 53, which is provided on a surface of the third connecting portion 54 facing the second wall portion 14. The first protrusion 53 is connected to the first electrode terminal 3 to more conveniently achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second protrusion 63, which is provided on a surface of the fourth connecting portion 64 facing the second wall portion 14. The second protrusion 63 is connected to the second electrode terminal 4 to conveniently achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0298] In this embodiment, the plurality of electrode assemblies 2 are arranged along a second direction Y, and the housing 1 includes a second wall portion 14 arranged along the second direction Y, such that the second wall portion 14 is aligned with the arrangement direction of the plurality of electrode assemblies 2. The first current collecting member 5 has a third connecting portion 54 connected to the first connecting portion 52, and the second current collecting member 6 has a fourth connecting portion 64 connected to the second connecting portion 62. By connecting the third connecting portion 54 to the first electrode terminal 3 provided on the second wall portion 14 and connecting the first connecting portion 52 to the first electrode tabs 21 of the plurality of electrode assemblies 2, the first electrode tabs 21 are electrically connected to the first electrode terminal 3 via the first current collecting member 5. By connecting the fourth connecting portion 64 to the second electrode terminal 4 provided on the second wall portion 14 and connecting the second connecting portion 62 to the second electrode tabs 22 of the plurality of electrode assemblies 2, the second electrode tabs 22 are electrically connected to the second electrode terminal 4 via the second current collecting member 6. In a battery cell 10 employing this structure, the first electrode terminal 3 and the second electrode terminal 4 are disposed on the second wall portion 14 in the second direction Y, so that the wall portion of the housing 1 facing the main body 23 in the first direction X is not provided with the first electrode terminal 3 and the second electrode terminal 4, thereby facilitating stacking of multiple battery cells 10 in the first direction X. Furthermore, the region where the first current collecting member 5 is connected to the first electrode terminal 3 and the region where the first current collecting member 5 is connected to the first electrode tab 21 can be separated from each other, and the region where the second current collecting member 6 is connected to the second electrode terminal 4 and the region where the second current collecting member 6 is connected to the second electrode tab 22 can be separated from each other, thereby reducing the difficulty of assembling the first current collecting member 5 with the first electrode terminal 3 and the first tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second tab 22, and reducing interference between the first electrode terminal 3 and the first tab 21, and between the second electrode terminal 4 and the second tab 22. In particular, when the first electrode terminal 3 and the first electrode tab 21 are both welded to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 are both welded to the second current collecting member 6, the mutual influence between the welding molten pool of the first electrode terminal 3 and the first current collecting member 5 and the welding molten pool of the first electrode tab 21 and the first current collecting member 5 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 4 and the second current collecting member 6 and the welding molten pool of the second electrode tab 22 and the second current collecting member 6 can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 3 and the first electrode tab 21 connected to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 connected to the second current collecting member 6.

[0299] In some embodiments, please continue to refer to Figure 12, the battery cell 10 may include a third insulating member 73, and the third insulating member 73 is arranged along the second direction Y on the side of the third connection part 54 and the fourth connection part 64 facing the multiple electrode assemblies 2 to insulate and isolate the third connection part 54 and the electrode assembly 2 and the fourth connection part 64 and the electrode assembly 2.

[0300] As an example, the third insulating member 73 is located in the housing 1, and along the second direction Y, the third insulating member 73 is located between the third connecting portion 54 and the plurality of electrode assemblies 2, and between the fourth connecting portion 64 and the plurality of electrode assemblies 2, so that the third connecting portion 54 and the electrode assembly 2, and the fourth connecting portion 64 and the electrode assembly 2 are insulated and isolated by the third insulating member 73. The third insulating member 73 is made of an insulating material, such as rubber, silicone, or plastic.

[0301] In this embodiment, the provision of the third insulating member 73 can, on the one hand, achieve insulation isolation between the third connection portion 54 and the electrode assembly 2 and between the fourth connection portion 64 and the electrode assembly 2, which is beneficial to reducing the risk of short circuit; on the other hand, it can achieve the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 sharing a third insulating member 73, which is beneficial to optimizing the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10.

[0302] In some embodiments, referring to FIG. 12 , along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the third connecting portion 54 is received in the first slot 731 .

[0303] The first engaging groove 731 is provided on a surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the third connecting portion 54 of the first current collecting member 5 can be engaged in the first engaging groove 731. As an example, the thickness of the third connecting portion 54 in the second direction Y is less than or equal to the depth of the first engaging groove 731 in the second direction Y, so that the third connecting portion 54 does not extend out of the first engaging groove 731 in the second direction Y.

[0304] In this embodiment, a first card slot 731 is provided on the side of the third insulating member 73 away from the electrode assembly 2 along the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be accommodated in the first card slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the multiple electrode assemblies 2, and the third insulating member 73 and the third connection portion 54 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0305] In some embodiments, referring to FIG. 12 , along the second direction Y, a second slot 732 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the fourth connecting portion 64 is received in the second slot 732 .

[0306] The second engaging groove 732 is provided on a surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the fourth connecting portion 64 of the second current collecting member 6 can be engaged in the second engaging groove 732. As an example, the thickness of the fourth connecting portion 64 in the second direction Y is less than or equal to the depth of the second engaging groove 732 in the second direction Y, so that the fourth connecting portion 64 does not extend out of the second engaging groove 732 in the second direction Y.

[0307] In this embodiment, a second card slot 732 is provided on the side of the third insulating member 73 away from the electrode assembly 2 along the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be accommodated in the second card slot 732, thereby improving the structural stability of the third insulating assembly between the fourth connection portion 64 and the multiple electrode assemblies 2, and the third insulating member 73 and the fourth connection portion 64 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0308] In some embodiments, please refer to Figures 17 and 18. Figure 17 is an exploded view of a battery cell 10 (with the first electrode tab 21 and the second electrode tab 22 disposed at the same end of the main body 23) provided in further embodiments of the present application; Figure 18 is an assembled view of the battery cell 10 shown in Figure 17. A plurality of electrode assemblies 2 are arranged along a second direction Y, which intersects the first direction X. The first current collecting member 5 includes a third connecting portion 54, which is connected to the first connecting portion 52. The second current collecting member 6 includes a fourth connecting portion 64, which is connected to the second connecting portion 62. Along the second direction Y, the housing 1 includes a second wall 14 and a third wall 15 disposed opposite each other. The third connecting portion 54 is located on the side of the plurality of electrode assemblies 2 facing the second wall 14, and the fourth connecting portion 64 is located on the side of the plurality of electrode assemblies 2 facing the third wall 15. The second wall portion 14 is provided with a first electrode terminal 3 , the third wall portion 15 is provided with a second electrode terminal 4 , and the third connecting portion 54 and the fourth connecting portion 64 are connected to the first electrode terminal 3 and the second electrode terminal 4 , respectively.

[0309] The third connection portion 54 is a portion of the first current collecting member 5 located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14 along the second direction Y. The fourth connection portion 64 is a portion of the second current collecting member 6 located on the side of the plurality of electrode assemblies 2 facing the third wall portion 15 along the second direction Y. In the embodiment where the first current collecting member 5 and the second current collecting member 6 are located within the housing 1, along the second direction Y, the third connection portion 54 is located between the second wall portion 14 and the plurality of electrode assemblies 2, and the fourth connection portion 64 is located between the third wall portion 15 and the plurality of electrode assemblies 2.

[0310] The second wall 14 and the third wall 15 are two walls of the housing 1 that are disposed opposite each other along the second direction Y. As an example, the thickness directions of the second wall 14 and the third wall 15 are both parallel to the second direction Y. The housing 1 includes a first wall 13 that is disposed opposite the plurality of electrode assemblies 2 along the first direction X. The first wall 13 connects the second wall 14 and the third wall 15. The first current collecting member 5 and the second current collecting member 6 are positioned within the housing 1. Along the first direction X, the first connecting portion 52 and the second connecting portion 62 are disposed between the main bodies 23 of the plurality of electrode assemblies 2 and the first wall 13. The first insulating member 71 is disposed between the first connecting portion 52 and the first wall 13 and between the second connecting portion 62 and the first wall 13. Along the second direction Y, the third connecting portion 54 is disposed between the main bodies 23 of the plurality of electrode assemblies 2 and the second wall 14. The fourth connecting portion 64 is disposed between the main bodies 23 of the plurality of electrode assemblies 2 and the third wall 15.

[0311] Of the second wall portion 14 and the third wall portion 15, one may be the end cap 12, and the other may be the wall portion of the housing 11 opposite the end cap 12; or both may be two end caps 12 or two opposite walls of the housing 11. As an example, in the embodiments shown in Figures 17 and 18, the second wall portion 14 and the third wall portion 15 are two opposite end caps 12 of the housing 1.

[0312] As an example, the first current collecting member 5 includes a first protrusion 53, which is provided on a surface of the third connecting portion 54 facing the second wall portion 14. The first protrusion 53 is connected to the first electrode terminal 3 to more conveniently achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second protrusion 63, which is provided on a surface of the fourth connecting portion 64 facing the third wall portion 15. The second protrusion 63 is connected to the second electrode terminal 4 to conveniently achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0313] In this embodiment, by respectively arranging the first electrode terminal 3 and the second electrode terminal 4 on the second wall portion 14 and the third wall portion 15 which are opposite to each other in the second direction Y, and respectively arranging the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 on both sides of the plurality of electrode assemblies 2, on the one hand, it is convenient to connect the third connection portion 54 of the first current collecting member 5 with the first electrode terminal 3, and to connect the fourth connection portion 64 of the second current collecting member 6 with the second electrode terminal 4; on the other hand, it is possible to achieve a large distance between the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6, which is conducive to alleviating the interference phenomenon between the third connection portion 54 and the fourth connection portion 64, and can reduce the risk of short circuit between the third connection portion 54 and the fourth connection portion 64, so as to improve the reliability of the battery cell 10.

[0314] 17 , in some embodiments, the battery cell 10 may include a third insulating member 73 and a fourth insulating member 74. The third insulating member 73 is disposed between the third connecting portion 54 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the third connecting portion 54 from the electrode assemblies 2. The fourth insulating member 74 is disposed between the fourth connecting portion 64 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the fourth connecting portion 64 from the electrode assemblies 2.

[0315] As an example, the third insulating member 73 and the fourth insulating member 74 are arranged opposite each other along the second direction Y. The third insulating member 73 and the fourth insulating member 74 are located within the housing 1. Along the second direction Y, the third insulating member 73 and the fourth insulating member 74 are located between the second wall portion 14 and the third wall portion 15, with the third insulating member 73 being closer to the second wall portion 14 than the fourth insulating member 74. It is understood that, along the second direction Y, the plurality of electrode assemblies 2 are located between the third insulating member 73 and the fourth insulating member 74. Furthermore, along the second direction Y, the third insulating member 73 is located between the third connecting portion 54 and the plurality of electrode assemblies 2, and the fourth insulating member 74 is located between the fourth connecting portion 64 and the plurality of electrode assemblies 2. The third insulating member 73 insulates and isolates the third connecting portion 54 from the electrode assemblies 2, while the fourth insulating member 74 insulates and isolates the fourth connecting portion 64 from the electrode assemblies 2. The third insulating member 73 and the fourth insulating member 74 are made of an insulating material, such as rubber, silicone, or plastic.

[0316] In this embodiment, by setting a third insulating member 73 between the third connecting part 54 and the multiple electrode assemblies 2, and setting a fourth insulating member 74 between the fourth connecting part 64 and the multiple electrode assemblies 2, insulation isolation between the third connecting part 54 and the multiple electrode assemblies 2 and between the fourth connecting part 64 and the multiple electrode assemblies 2 can be achieved, thereby reducing the risk of internal short circuit of the battery cell 10 and improving the reliability of the battery cell 10.

[0317] In some embodiments, referring to FIG. 17 , along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the third connecting portion 54 is received in the first slot 731 .

[0318] The first engaging groove 731 is provided on a surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the third connecting portion 54 of the first current collecting member 5 can be engaged in the first engaging groove 731. As an example, the thickness of the third connecting portion 54 in the second direction Y is less than or equal to the depth of the first engaging groove 731 in the second direction Y, so that the third connecting portion 54 does not extend out of the first engaging groove 731 in the second direction Y.

[0319] In this embodiment, a first card slot 731 is provided on the side of the third insulating member 73 away from the multiple electrode assemblies 2 along the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be accommodated in the first card slot 731, thereby improving the structural stability of the third insulating member 73 assembled between the third connection portion 54 and the multiple electrode assemblies 2, and the third insulating member 73 and the third connection portion 54 can share space in the first direction X, which is beneficial to improving the internal space utilization of the battery cell 10.

[0320] In some embodiments, referring to FIG. 17 , along the second direction Y, a second slot 732 is provided on a side of the fourth insulating member 74 facing away from the electrode assemblies 2 , and the fourth connecting portion 64 is received in the second slot 732 .

[0321] The second engaging groove 732 is provided on a surface of the fourth insulating member 74 facing the third wall portion 15 in the second direction Y, so that the fourth connecting portion 64 of the second current collecting member 6 can be engaged with the second engaging groove 732. As an example, the thickness of the fourth connecting portion 64 in the second direction Y is less than or equal to the depth of the second engaging groove 732 in the second direction Y, so that the fourth connecting portion 64 does not extend out of the second engaging groove 732 in the second direction Y.

[0322] In this embodiment, a second card slot 732 is provided on the side of the fourth insulating member 74 away from the multiple electrode assemblies 2 along the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be accommodated in the second card slot 732, thereby improving the structural stability of the fourth insulating assembly between the fourth connection portion 64 and the multiple electrode assemblies 2, and the fourth insulating member 74 and the fourth connection portion 64 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0323] In some embodiments, please refer to Figures 19-23. Figure 19 is an exploded view of a battery cell 10 (with a first electrode tab 21 and a second electrode tab 22 disposed at opposite ends of a main body 23) provided in some embodiments of the present application; Figure 20 is an assembled view of the battery cell 10 shown in Figure 19; Figure 21 is a schematic diagram of the connection between the electrode assembly 2, the first current collecting member 5, and the second current collecting member 6 shown in Figure 19; Figure 22 is a schematic diagram of the structure of the first current collecting member 5 shown in Figure 19; and Figure 23 is a schematic diagram of the structure of the second current collecting member 6 shown in Figure 19. Along a first direction X, the first electrode tab 21 and the second electrode tab 22 are disposed at opposite ends of the main body 23. The first current collecting member 5 includes a first connecting portion 52 connecting each first electrode tab 21. The first connecting portion 52 is located on the side of the main body 23 in the first direction X where the first electrode tab 21 is disposed. The second current collecting member 6 includes a second connecting portion 62 connecting each second electrode tab 22. The second connecting portion 62 is located on the side of the main body 23 in the first direction X where the second electrode tab 22 is disposed.

[0324] The first connecting portion 52 is the portion of the first current collecting member 5 located on the side of the main body 23 where the first electrode tab 21 is located in the first direction X. It serves to connect the first electrode tabs 21 of the multiple electrode assemblies 2. The first connecting portion 52 may be a portion of the first current collecting member 5, or it may be the first current collecting member 5 itself. The connection between the first connecting portion 52 and the first electrode tab 21 can be achieved through various methods, such as welding, abutment, or conductive adhesive bonding. The second connecting portion 62 is the portion of the second current collecting member 6 located on the side of the main body 23 where the second electrode tab 22 is located in the first direction X. It serves to connect the second electrode tabs 22 of the multiple electrode assemblies 2. The second connecting portion 62 may be a portion of the second current collecting member 6, or it may be the second current collecting member 6 itself. The second connecting portion 62 connects the second electrode tabs 22 of the multiple electrode assemblies 2. The connection between the second connecting portion 62 and the second electrode tab 22 can be achieved through various methods, such as welding, abutment, or conductive adhesive bonding.

[0325] As an example, multiple electrode assemblies 2 are arranged along the second direction Y, first electrode tabs 21 and second electrode tabs 22 are arranged along the first direction X, first current collecting members 5 and second current collecting members 6 are located within the housing 1 and arranged along the first direction X, first connecting portions 52 and second connecting portions 62 are disposed opposite each other along the first direction X, and the housing 1 is rectangular. The third direction Z is parallel to the height of the housing 1. Along the third direction Z, the outer surface areas of two opposing walls of the housing 1 are greater than the outer surface areas of the other walls. The first direction X, the second direction Y, and the third direction Z are non-coplanar and intersect with each other. Each of the first direction X, the second direction Y, and the third direction Z forms a plane, and the first direction X, the second direction Y, and the third direction Z are non-coplanar. That is, the three planes formed by the first direction X, the second direction Y, and the third direction Z are non-coplanar.

[0326] The outer casing 1 is provided with a first electrode terminal 3 and a second electrode terminal 4. The first electrode terminal 3 is connected to the first current collecting member 5, and the second electrode terminal 4 is connected to the second current collecting member 6. The first electrode terminal 3 and the second electrode terminal 4 can be respectively provided on two walls of the outer casing 1. For example, the first electrode terminal 3 and the second electrode terminal 4 are provided on two opposing walls of the outer casing 1 along a first direction X. For another example, the first electrode terminal 3 and the second electrode terminal 4 are provided on two adjacent walls of the outer casing 1. The first electrode terminal 3 and the second electrode terminal 4 can also be provided on the same wall of the outer casing 1. For example, the first electrode terminal 3 and the second electrode terminal 4 are provided on the same wall of the outer casing 1 along the first direction X. For another example, the first electrode terminal 3 and the second electrode terminal 4 are provided on the same wall of the outer casing 1 along the second direction Y. For another example, the first electrode terminal 3 and the second electrode terminal 4 are provided on the same wall of the outer casing 1 along the third direction Z.

[0327] It should be noted that in the embodiment where the first current collecting member 5 is provided with the first avoidance area 51, the first avoidance area 51 can be provided at the first connecting portion 52. In the embodiment where the second current collecting member 6 is provided with the second avoidance area 61, the second avoidance area 61 can be provided at the second connecting portion 62.

[0328] In this embodiment, by respectively arranging the first electrode tab 21 and the second electrode tab 22 at the two ends of the main body 23 in the first direction X, and respectively arranging the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 on both sides of the plurality of electrode assemblies 2 in the first direction X, on the one hand, it is convenient for the first current collecting member 5 and the second current collecting member 6 to be connected to the first electrode tab 21 and the second electrode tab 22 respectively, which is conducive to alleviating the mutual interference between the first current collecting member 5 and the second current collecting member 6; on the other hand, it can make the first electrode tab 21 and the second electrode tab 22 with opposite polarities stay away from each other, and can make the first connecting portion 52 of the first current collecting member 5 and the second connecting portion 62 of the second current collecting member 6 stay away from each other, which is conducive to reducing the risk of short circuit between the first electrode tab 21 and the second electrode tab 22 and between the first current collecting member 5 and the second current collecting member 6, thereby improving the reliability of the battery cell 10.

[0329] In some embodiments, please continue to refer to Figure 19, the battery cell 10 may include two first insulating members 71, and the two first insulating members 71 are respectively arranged on both sides of the multiple electrode assemblies 2 along the first direction X, one first insulating member 71 is located on the side of the first connection part 52 away from the main body 23 to insulate and isolate the first connection part 52 and the outer shell 1, and the other first insulating member 71 is located on the side of the second connection part 62 away from the main body 23 to insulate and isolate the second connection part 62 and the outer shell 1.

[0330] As an example, two first insulating members 71 are located within the housing 1. Along the first direction X, one first insulating member 71 is located between the first connecting portion 52 of the first current collecting member 5 and one wall of the housing 1, and the other first insulating member 71 is located between the second connecting portion 62 of the second current collecting member 6 and another wall of the housing 1. This allows the first connecting portion 52 and the second connecting portion 62 to be insulated and isolated from the housing 1 by the two first insulating members 71, respectively. The first insulating members 71 are made of an insulating material, such as rubber, silicone, or plastic.

[0331] In this embodiment, a first insulating member 71 is provided between the first connecting portion 52 and the outer shell 1, and between the second connecting portion 62 and the outer shell 1, so that the two first insulating members 71 can respectively achieve insulation isolation between the first connecting portion 52 and the outer shell 1, and between the second connecting portion 62 and the outer shell 1, which is beneficial to reducing the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the outer shell 1, thereby improving the reliability of the battery cell 10.

[0332] In some embodiments, please continue to refer to Figure 19. The battery cell 10 may include two second insulating members 72, and the two second insulating members 72 are respectively arranged on both sides of the multiple electrode assemblies 2 along the first direction X. Along the first direction X, one second insulating member 72 is located on the side of the first connection part 52 facing the main body 23 to insulate and isolate the first connection part 52 and the main body 23, and the other second insulating member 72 is located on the side of the second connection part 62 facing the main body 23 to insulate and isolate the second connection part 62 and the main body 23.

[0333] As an example, two second insulating members 72 are located within the housing 1. Along the first direction X, one second insulating member 72 is located between the first connecting portion 52 of the first current collecting member 5 and the main body 23, and the other second insulating member 72 is located between the second connecting portion 62 of the second current collecting member 6 and the main body 23. This allows the first connecting portion 52 and the second connecting portion 62 to be insulated and isolated from the main body 23 by the two second insulating members 72, respectively. The second insulating members 72 are made of an insulating material, such as rubber, silicone, or plastic.

[0334] In this embodiment, a second insulating member 72 is provided between the first connecting portion 52 and the main body 23 and between the second connecting portion 62 and the main body 23, so that the two second insulating members 72 can respectively achieve insulation isolation between the first connecting portion 52 and the main body 23 and between the second connecting portion 62 and the main body 23, which is beneficial to reducing the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the main body 23, thereby improving the reliability of the battery cell 10.

[0335] In some embodiments, referring again to Figures 19-23, multiple electrode assemblies 2 are arranged along a second direction Y, which intersects the first direction X. The first current collecting member 5 includes a third connecting portion 54, which is connected to the first connecting portion 52. The second current collecting member 6 includes a fourth connecting portion 64, which is connected to the second connecting portion 62. Along the second direction Y, the housing 1 includes a first wall 13. The third connecting portion 54 and the fourth connecting portion 64 are both located on a side of the multiple electrode assemblies 2 facing the first wall 13. The first wall 13 is provided with a first electrode terminal 3 and a second electrode terminal 4. The third connecting portion 54 and the fourth connecting portion 64 are respectively connected to the first electrode terminal 3 and the second electrode terminal 4.

[0336] The third connection portion 54 is a portion of the first current collecting member 5 located on the side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y. The fourth connection portion 64 is a portion of the second current collecting member 6 located on the side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y. In the embodiment in which the first current collecting member 5 and the second current collecting member 6 are located within the housing 1, along the second direction Y, the third connection portion 54 is located between the first wall portion 13 and the plurality of electrode assemblies 2, and the fourth connection portion 64 is located between the first wall portion 13 and the plurality of electrode assemblies 2.

[0337] The first connecting portion 52 and the third connecting portion 54 can be an integral structure, that is, the first connecting portion 52 and the third connecting portion 54 are integrally formed, and the first connecting portion 52 and the third connecting portion 54 can be made by an integral forming process such as stamping or casting. Of course, the first connecting portion 52 and the third connecting portion 54 can also be a split structure, that is, the first connecting portion 52 and the third connecting portion 54 are separately provided, and the first connecting portion 52 and the third connecting portion 54 can be connected by a structure such as welding connection or bolt screw connection. Similarly, the second connecting portion 62 and the fourth connecting portion 64 can be an integral structure, that is, the second connecting portion 62 and the fourth connecting portion 64 are integrally formed, and the second connecting portion 62 and the fourth connecting portion 64 can be made by an integral forming process such as stamping or casting. Of course, the second connecting portion 62 and the fourth connecting portion 64 can also be a split structure, that is, the second connecting portion 62 and the fourth connecting portion 64 are separately provided, and the second connecting portion 62 and the fourth connecting portion 64 can be connected by a structure such as welding connection or bolt screw connection.

[0338] The first wall 13 is a wall portion of the housing 1 located in the second direction Y and provided with the first and second electrode terminals 3 and 4. As an example, the thickness direction of the first wall 13 is parallel to the second direction Y. The first and second current collecting members 5 and 6 are located within the housing 1. Along the first direction X, the first connecting portion 52 is provided between the main body 23 of the plurality of electrode assemblies 2 and one wall portion of the housing 1, and the second connecting portion 62 is provided between the main body 23 of the plurality of electrode assemblies 2 and another wall portion of the housing 1. Along the second direction Y, the third connecting portion 54 and the fourth connecting portion 64 are both provided between the main body 23 of the plurality of electrode assemblies 2 and the first wall 13.

[0339] The first wall portion 13 may be the end cover 12 in the housing 1, or may be a wall portion in the shell 11 of the housing 1. In the embodiment shown in Figures 19 and 20, the first wall portion 13 is the end cover 12.

[0340] As an example, the first current collecting member 5 includes a first protrusion 53, which is provided on a surface of the third connecting portion 54 facing the first wall portion 13. The first protrusion 53 is connected to the first electrode terminal 3 to more conveniently achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second protrusion 63, which is provided on a surface of the fourth connecting portion 64 facing the first wall portion 13. The second protrusion 63 is connected to the second electrode terminal 4 to conveniently achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0341] In this embodiment, the first electrode terminal 3 and the second electrode terminal 4 are both arranged on the first wall portion 13, and the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 are both arranged on the side of the plurality of electrode assemblies 2 facing the first wall portion 13. On the one hand, this facilitates the connection between the third connection portion 54 of the first current collecting member 5 and the first electrode terminal 3, and facilitates the connection between the fourth connection portion 64 of the second current collecting member 6 and the second electrode terminal 4. On the other hand, the battery cell 10 is configured to have a structure in which the first electrode terminal 3 and the second electrode terminal 4 are output at the same end in the second direction Y, and the third connection portion 54 and the fourth connection portion 64 can share space in the second direction Y, thereby improving the space utilization of the battery cell 10 and thereby increasing the volume energy density of the battery cell 10. In addition, with the battery cell 10 of this structure, the first electrode terminal 3 and the second electrode terminal 4 are arranged on the first wall portion 13 in the second direction Y, so that the wall portion of the housing 1 facing the main body 23 along the first direction X is not provided with the first electrode terminal 3 and the second electrode terminal 4, thereby facilitating stacking of multiple battery cells 10 along the first direction X. On the other hand, the area where the first current collecting member 5 is connected to the first electrode terminal 3 and the area where the first current collecting member 5 is connected to the first electrode tab 21 can be separated from each other, and the area where the second current collecting member 6 is connected to the second electrode terminal 4 and the area where the second current collecting member 6 is connected to the second electrode tab 22 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 5 with the first electrode terminal 3 and the first tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second tab 22, and reducing the interference problem between the first electrode terminal 3 and the first tab 21 and between the second electrode terminal 4 and the second tab 22. In particular, when the first electrode terminal 3 and the first electrode tab 21 are both welded to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 are both welded to the second current collecting member 6, the mutual influence between the welding molten pool of the first electrode terminal 3 and the first current collecting member 5 and the welding molten pool of the first electrode tab 21 and the first current collecting member 5 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 4 and the second current collecting member 6 and the welding molten pool of the second electrode tab 22 and the second current collecting member 6 can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 3 and the first electrode tab 21 connected to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 connected to the second current collecting member 6.

[0342] In some embodiments, please continue to refer to Figure 19, the battery cell 10 may include a third insulating member 73, and the third insulating member 73 is arranged along the second direction Y on the side of the third connection part 54 and the fourth connection part 64 facing the multiple electrode assemblies 2 to insulate and isolate the third connection part 54 and the electrode assembly 2 and the fourth connection part 64 and the electrode assembly 2.

[0343] As an example, the third insulating member 73 is located in the housing 1, along the second direction Y, on the side of the plurality of electrode assemblies 2 facing the first wall portion 13, and is located between the third connecting portion 54 and the plurality of electrode assemblies 2, and between the fourth connecting portion 64 and the plurality of electrode assemblies 2, so as to insulate and isolate the third connecting portion 54 from the electrode assemblies 2, and the fourth connecting portion 64 from the electrode assemblies 2 via the third insulating member 73. The third insulating member 73 is made of an insulating material, such as rubber, silicone, or plastic.

[0344] In this embodiment, the provision of the third insulating member 73 can, on the one hand, achieve insulation isolation between the third connection portion 54 and the electrode assembly 2 and between the fourth connection portion 64 and the electrode assembly 2, which is beneficial to reducing the risk of short circuit; on the other hand, it can achieve the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 sharing a third insulating member 73, which is beneficial to optimizing the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10.

[0345] In some embodiments, referring to FIG. 19 , along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the third connecting portion 54 is received in the first slot 731 .

[0346] The first engaging groove 731 is provided on a surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the third connecting portion 54 of the first current collecting member 5 can be engaged in the first engaging groove 731. As an example, the thickness of the third connecting portion 54 in the second direction Y is less than or equal to the depth of the first engaging groove 731 in the second direction Y, so that the third connecting portion 54 does not extend out of the first engaging groove 731 in the second direction Y.

[0347] In this embodiment, a first card slot 731 is provided on the side of the third insulating member 73 away from the electrode assembly 2 along the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be accommodated in the first card slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the multiple electrode assemblies 2, and the third insulating member 73 and the third connection portion 54 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0348] In some embodiments, referring to FIG. 19 , along the second direction Y, a second slot 732 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the fourth connecting portion 64 is received in the second slot 732 .

[0349] The second engaging groove 732 is provided on a surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the fourth connecting portion 64 of the second current collecting member 6 can be engaged in the second engaging groove 732. As an example, the thickness of the fourth connecting portion 64 in the second direction Y is less than or equal to the depth of the second engaging groove 732 in the second direction Y, so that the fourth connecting portion 64 does not extend out of the second engaging groove 732 in the second direction Y.

[0350] In this embodiment, a second card slot 732 is provided on the side of the third insulating member 73 away from the electrode assembly 2 along the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be accommodated in the second card slot 732, thereby improving the structural stability of the third insulating assembly between the fourth connection portion 64 and the multiple electrode assemblies 2, and the third insulating member 73 and the fourth connection portion 64 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0351] In some embodiments, please refer to FIG. 24 , which is an exploded view of a battery cell 10 (with a first electrode tab 21 and a second electrode tab 22 disposed at opposite ends of a main body 23) provided in other embodiments of the present application. Multiple electrode assemblies 2 are arranged along a second direction Y, which intersects the first direction X. The first current collecting member 5 includes a third connecting portion 54 connected to the first connecting portion 52, and the second current collecting member 6 includes a fourth connecting portion 64 connected to the second connecting portion 62. Along the second direction Y, the housing 1 includes a first wall 13 and a second wall 14 disposed opposite each other. The third connecting portion 54 is located on a side of the multiple electrode assemblies 2 facing the first wall 13, and the fourth connecting portion 64 is located on a side of the multiple electrode assemblies 2 facing the second wall 14. The first wall 13 is provided with a first electrode terminal 3, and the second wall 14 is provided with a second electrode terminal 4. The third connecting portion 54 and the fourth connecting portion 64 are connected to the first electrode terminal 3 and the second electrode terminal 4, respectively.

[0352] The third connection portion 54 is a portion of the first current collecting member 5 located on the side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y. The fourth connection portion 64 is a portion of the second current collecting member 6 located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14 along the second direction Y. In the embodiment where the first current collecting member 5 and the second current collecting member 6 are located within the housing 1, along the second direction Y, the third connection portion 54 is located between the first wall portion 13 and the plurality of electrode assemblies 2, and the fourth connection portion 64 is located between the second wall portion 14 and the plurality of electrode assemblies 2.

[0353] The first wall 13 and the third wall 15 are two walls of the housing 1 that are disposed opposite each other along the second direction Y. As an example, the thickness direction of the first wall 13 and the thickness direction of the second wall 14 are both parallel to the second direction Y. As an example, the first current collecting member 5 and the second current collecting member 6 are positioned within the housing 1. Along the first direction X, the first connecting portion 52 is disposed between the main body 23 of the plurality of electrode assemblies 2 and one wall of the housing 1, and the second connecting portion 62 is disposed between the main body 23 of the plurality of electrode assemblies 2 and another wall of the housing 1. Along the second direction Y, the third connecting portion 54 is disposed between the main body 23 of the plurality of electrode assemblies 2 and the first wall 13, and the fourth connecting portion 64 is disposed between the main body 23 of the plurality of electrode assemblies 2 and the second wall 14.

[0354] One of the first wall portion 13 and the second wall portion 14 may be the end cap 12, and the other may be the wall portion of the housing 11 opposite the end cap 12; or both may be two end caps 12 or two opposite walls of the housing 11. As an example, in the embodiment shown in FIG24 , the first wall portion 13 and the second wall portion 14 are two opposite end caps 12 of the housing 1.

[0355] As an example, the first current collecting member 5 includes a first protrusion 53, which is provided on a surface of the third connecting portion 54 facing the first wall portion 13. The first protrusion 53 is connected to the first electrode terminal 3 to more conveniently achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second protrusion 63, which is provided on a surface of the fourth connecting portion 64 facing the second wall portion 14. The second protrusion 63 is connected to the second electrode terminal 4 to conveniently achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0356] By respectively arranging the first electrode terminal 3 and the second electrode terminal 4 on the first wall portion 13 and the second wall portion 14 which are arranged opposite to each other along the second direction Y, and the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 are respectively located on both sides of the plurality of electrode assemblies 2, on the one hand, it is convenient for the third connection portion 54 of the first current collecting member 5 to be connected to the first electrode terminal 3, and it is convenient for the fourth connection portion 64 of the second current collecting member 6 to be connected to the second electrode terminal 4. On the other hand, it is possible to realize that the third connection portion 54 of the first current collecting member 5 and the fourth connection portion 64 of the second current collecting member 6 are kept away from each other, which is beneficial to reducing the risk of short circuit between the third connection portion 54 and the fourth connection portion 64, thereby improving the reliability of the battery cell 10. In addition, with the battery cell 10 adopting this structure, the first electrode terminal 3 and the second electrode terminal 4 are respectively provided on the first wall portion 13 and the second wall portion 14 in the second direction Y, so that the wall portion of the housing 1 facing the main body portion 23 along the first direction X is not provided with the first electrode terminal 3 and the second electrode terminal 4, thereby facilitating stacking of multiple battery cells 10 along the first direction X. On the other hand, the area where the first current collecting member 5 is connected to the first electrode terminal 3 and the area where the first current collecting member 5 is connected to the first electrode tab 21 can be separated from each other, and the area where the second current collecting member 6 is connected to the second electrode terminal 4 and the area where the second current collecting member 6 is connected to the second electrode tab 22 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 5 with the first electrode terminal 3 and the first tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second tab 22, and reducing the interference problem between the first electrode terminal 3 and the first tab 21, and between the second electrode terminal 4 and the second tab 22. In particular, when the first electrode terminal 3 and the first electrode tab 21 are both welded to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 are both welded to the second current collecting member 6, the mutual influence between the welding molten pool of the first electrode terminal 3 and the first current collecting member 5 and the welding molten pool of the first electrode tab 21 and the first current collecting member 5 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 4 and the second current collecting member 6 and the welding molten pool of the second electrode tab 22 and the second current collecting member 6 can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 3 and the first electrode tab 21 connected to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 connected to the second current collecting member 6.

[0357] 24 , the battery cell 10 may include a third insulating member 73 and a fourth insulating member 74 in some embodiments. The third insulating member 73 is disposed between the third connecting portion 54 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the third connecting portion 54 from the electrode assemblies 2. The fourth insulating member 74 is disposed between the fourth connecting portion 64 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the fourth connecting portion 64 from the electrode assemblies 2.

[0358] The third insulating member 73 and the fourth insulating member 74 are arranged opposite each other along the second direction Y. As an example, the third insulating member 73 and the fourth insulating member 74 are located within the housing 1, and along the second direction Y, the third insulating member 73 and the fourth insulating member 74 are located between the first wall portion 13 and the second wall portion 14, with the third insulating member 73 being closer to the first wall portion 13 than the fourth insulating member 74. It will be understood that, along the second direction Y, the plurality of electrode assemblies 2 are located between the third insulating member 73 and the fourth insulating member 74. Specifically, along the second direction Y, the third insulating member 73 is located between the third connecting portion 54 and the plurality of electrode assemblies 2, and the fourth insulating member 74 is located between the fourth connecting portion 64 and the plurality of electrode assemblies 2, so that the third insulating member 73 insulates and isolates the third connecting portion 54 from the electrode assemblies 2, and the fourth insulating member 74 insulates and isolates the fourth connecting portion 64 from the electrode assemblies 2. The third insulating member 73 and the fourth insulating member 74 are made of an insulating material, such as rubber, silicone, or plastic.

[0359] In this embodiment, the third insulating member 73 and the fourth insulating member 74 can achieve insulation isolation between the third connecting portion 54 and the electrode assembly 2 and between the fourth connecting portion 64 and the electrode assembly 2, thereby helping to reduce the short-circuit risk of the battery cell 10 and improve the reliability of the battery cell 10.

[0360] In some embodiments, referring to FIG. 24 , along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 facing away from the electrode assemblies 2 , and the third connecting portion 54 is received in the first slot 731 .

[0361] The first engaging groove 731 is provided on a surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the third connecting portion 54 of the first current collecting member 5 can be engaged in the first engaging groove 731. As an example, the thickness of the third connecting portion 54 in the second direction Y is less than or equal to the depth of the first engaging groove 731 in the second direction Y, so that the third connecting portion 54 does not extend out of the first engaging groove 731 in the second direction Y.

[0362] In this embodiment, a first card slot 731 is provided on the side of the third insulating member 73 away from the electrode assembly 2 along the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be accommodated in the first card slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the multiple electrode assemblies 2, and the third insulating member 73 and the third connection portion 54 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0363] In some embodiments, referring to FIG. 24 , along the second direction Y, a second slot 732 is provided on a side of the fourth insulating member 74 facing away from the electrode assemblies 2 , and the fourth connecting portion 64 is received in the second slot 732 .

[0364] The second engaging groove 732 is provided on a surface of the fourth insulating member 74 facing the second wall portion 14 in the second direction Y, so that the fourth connecting portion 64 of the second current collecting member 6 can be engaged in the second engaging groove 732. As an example, the thickness of the fourth connecting portion 64 in the second direction Y is less than or equal to the depth of the second engaging groove 732 in the second direction Y, so that the fourth connecting portion 64 does not extend out of the second engaging groove 732 in the second direction Y.

[0365] In this embodiment, a second slot 732 is provided on the side of the fourth insulating member 74 away from the electrode assembly 2 along the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be accommodated in the second slot 732, thereby improving the structural stability of the fourth insulating assembly between the fourth connection portion 64 and the multiple electrode assemblies 2, and the fourth insulating member 74 and the fourth connection portion 64 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0366] In some embodiments, please refer to FIG. 25 , which is an exploded view of a battery cell 10 (with a separator 8 disposed within the housing 1 ) provided in some embodiments of the present application. The battery cell 10 includes multiple electrode assemblies 2 . The housing 1 has a housing space within which the multiple electrode assemblies 2 are housed. The battery cell 10 also includes a separator 8 disposed within the housing space. The separator 8 is configured to divide the housing space into multiple subspaces 81 , each of which accommodates at least one electrode assembly 2 .

[0367] The separator 8 is a component within the battery cell 10 that divides the housing space of the housing 1 into a plurality of subspaces 81. The subspaces 81 may be defined jointly by the separator 8 and the housing 1, or they may be defined solely by the separator 8. For example, the subspaces 81 may be formed within the separator 8. The separator 8 is disposed within the housing space and may be connected to the housing 1 to secure the separator 8 thereto. For example, the separator 8 may be connected to the end cap 12 of the housing 1, or to the shell 11 of the housing 1. Alternatively, the separator 8 may be placed within the housing 1, with the separator 8 and the housing 1 merely in contact, but not connected together. For example, the separator 8 may be placed within the shell 11 of the housing 1, with the separator 8 and the shell 11 in contact.

[0368] In the housing 1, the total space of the multiple subspaces 81 constitutes a portion of the accommodation space. Each subspace 81 can accommodate one electrode assembly 2 or multiple electrode assemblies 2. The multiple subspaces 81 can be arranged along a particular direction. For example, in the case of a rectangular battery cell 10 in the housing 1, the multiple subspaces 81 can be arranged along the length, width, or height of the housing 1. The multiple subspaces 81 can also be arranged in multiple directions, for example, in multiple rows and columns.

[0369] It should be noted that in this embodiment, the first electrode tab 21 and the second electrode tab 22 can be disposed at the same end of the main body 23 along the first direction X, or respectively at opposite ends of the main body 23 along the first direction X. The first current collecting member 5 and the second current collecting member 6 can be disposed on the same side of the main body 23 along the first direction X, or respectively at opposite sides of the main body 23 along the first direction X. The first electrode terminal 3 and the second electrode terminal 4 can be disposed on the same wall of the housing 1, or respectively on opposite walls of the housing 1. The first electrode terminal 3 and the second electrode terminal 4 can be disposed on a wall of the housing 1 in the first direction X, or respectively on a wall of the housing 1 in the second direction Y. The first direction X and the second direction Y intersect.

[0370] As an example, in Figure 25, multiple electrode assemblies 2 are arranged along the second direction Y, the first electrode tab 21 and the second electrode tab 22 are arranged at the same end of the main body 23 along the first direction X, the first current collecting member 5 and the second current collecting member 6 are arranged along the third direction Z, the first current collecting member 5 and the second current collecting member 6 are arranged on one side of the multiple electrode assemblies 2 along the first direction X, the first electrode terminal 3 and the second electrode terminal 4 are arranged on the same wall portion of the shell 11, and the wall portion is arranged opposite to the multiple electrode assemblies 2 along the second direction Y, and the third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0371] In this embodiment, a separator 8 is provided in the accommodation space of the shell 1, and the separator 8 divides the accommodation space into multiple subspaces 81. The separator 8 separates the electrode assemblies 2 in each subspace 81 to reduce the risk of expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 81, which causes the electrode assemblies 2 to be squeezed and deformed from each other, thereby effectively improving the reliability of the battery cell 10.

[0372] In some embodiments, please refer to Figures 26 and 27. Figure 26 is a schematic diagram illustrating the connection between the housing 11 shown in Figure 25 and the separator 8; Figure 27 is a cross-sectional view of the housing 11 shown in Figure 26 taken along the XY plane. The separator 8 includes a partition wall 82 configured to separate two adjacent subspaces 81. The partition wall 82 defines a receiving cavity 821. The battery cell 10 includes a thermal management component 9, which is housed within the receiving cavity 821.

[0373] The partition wall 82 may be one or more. The partition wall 82 may be plate-shaped, solid, or hollow. The partition wall 82 may be connected to the housing 1 to secure the partition wall 82 to the housing 1, or the partition wall 82 may simply remain in contact with the housing 1.

[0374] The accommodating cavity 821 may be a closed structure or an open structure with an opening. One partition wall 82 may be provided with one accommodating cavity 821 or may be provided with multiple accommodating cavities 821 .

[0375] Thermal management component 9 manages the temperature of battery cells 10. It is used to exchange heat with battery cells 10 to manage the temperature of battery cells 10. Thermal management component 9 can be a heating component that heats battery cells 10, or a cooling component that cools battery cells 10. The cooling component can be a heat sink, a water-cooled plate, or the like.

[0376] In this embodiment, a accommodating cavity 821 is formed inside the partition wall 82, and the thermal management component 9 is arranged in the accommodating cavity 821 of the partition wall 82, making full use of the space inside the partition wall 82. While achieving temperature management of the electrode assembly 2, the space occupied by the thermal management component 9 inside the outer shell 1 is reduced, freeing up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10.

[0377] In some embodiments, please refer to FIG28 , which is a schematic structural diagram of the housing 1 shown in FIG25 . The outer surface of the housing 1 is provided with an opening 16 for the heat management component 9 to enter the accommodating cavity 821 , and the opening 16 is in communication with the accommodating cavity 821 .

[0378] In this embodiment, the opening 16 may be provided on the outer surface of the shell 11 or on the outer surface of the end cover 12 , and the opening 16 may correspond to the partition wall 82 one by one.

[0379] In this embodiment, the outer surface of the shell 1 is provided with a mouth 16 connected to the accommodating cavity 821. The thermal management component 9 can enter the accommodating cavity 821 through the mouth 16 from the outside of the shell 1. When installing or removing the thermal management component 9, there is no need to open the shell 1, which makes the operation more convenient.

[0380] In some embodiments, please continue to refer to Figures 25 to 27. The partition device 8 includes at least one partition wall 82. The partition wall 82 is arranged in the accommodating space and connected to the shell 1. The partition wall 82 is configured to separate two adjacent sub-spaces 81.

[0381] The number of partition walls 82 may be one or more. The number of subspaces 81 may be one more than the number of sub-partition walls 82. For example, if there is one partition wall 82, there are two subspaces 81; or if there are two partition walls 82, there are three subspaces 81.

[0382] The partition wall 82 is connected to the outer shell 1 to achieve the fixation of the partition wall 82 to the outer shell 1. The partition wall 82 can be connected to the shell 11 or the end cover 12 of the outer shell 1, or the partition wall 82 can be connected to both the shell 11 and the end cover 12. If the partition wall 82 is connected to the shell 11, the partition wall 82 can be connected to one wall portion of the shell 11, or to multiple walls of the shell 11. If there are multiple partition walls 82, the multiple partition walls 82 can be connected to the same wall portion of the outer shell 1, for example, the multiple partition walls 82 are all connected to the end cover 12 of the outer shell 1, or for another example, the multiple partition walls 82 are all connected to the same wall portion of the shell 11; the multiple partition walls 82 can also be connected to different walls of the outer shell 1, for example, some of the multiple partition walls 82 are connected to the end cover 12, and other parts are connected to the outer shell 11. As an example, in Figures 25 to 27, all the partition walls 82 are connected to the wall portion of the shell 11 opposite to the end cover 12.

[0383] In this embodiment, the accommodation space within the housing 1 is divided into multiple subspaces 81 by at least one partition wall 82. This simple structure allows each partition wall 82 to separate the electrode assemblies 2 within two adjacent subspaces 81. Because the partition walls 82 are connected to the housing 1, the expansion force generated by the electrode assemblies 2 within the subspaces 81 can be transmitted to the housing 1 via the partition walls 82, reducing the risk of the expansion force generated by the electrode assembly 2 in one subspace 81 being transmitted to the electrode assembly 2 in another adjacent subspace 81.

[0384] In some embodiments, please continue to refer to Figures 25 to 27, multiple electrode assemblies 2 are arranged along the second direction Y, and the partition device 8 includes multiple partition walls 82. Along the second direction Y, the multiple partition walls 82 are spaced apart in the accommodating space.

[0385] The plurality of partition walls 82 are spaced apart along the second direction Y, that is, there is a gap between every two adjacent partition walls 82 .

[0386] In this embodiment, the electrode assembly 2 may be cylindrical, flat, etc. As an example, in FIG25 , the electrode assembly 2 is flat, and the thickness direction of the electrode assembly 2 is parallel to the second direction Y.

[0387] Taking the case 1 as a rectangular parallelepiped as an example, the arrangement direction of the multiple partition walls 82 can be parallel to the length, width, or height of the case 1. As an example, the arrangement direction of the multiple partition walls 82 is parallel to the length direction of the battery cell 10. There are four partition walls 82, and the four partition walls 82 divide the accommodation space into five subspaces 81.

[0388] As an example, the first direction X is parallel to the height direction of the housing 1 , the second direction Y is parallel to the length direction of the housing 1 , and the third direction Z is parallel to the width direction of the housing 1 .

[0389] In this embodiment, a plurality of partition walls 82 arranged at intervals can divide the accommodating space into more subspaces 81, so that the electrode assemblies 2 in more subspaces 81 are separated by the partition walls 82, and the expansion force generated by all electrode assemblies 2 can be transmitted to the outer shell 1 through more partition walls 82, further reducing the risk of extrusion and deformation of the electrode assemblies 2.

[0390] In some embodiments, referring to Figures 29 and 30 , Figure 29 is an exploded view of a battery cell 10 (with a separator 8 disposed within the housing 1 ) provided in other embodiments of the present application; and Figure 30 is a schematic structural diagram of the separator 8 shown in Figure 29 . A subspace 81 is formed within the separator 8 .

[0391] It will be appreciated that subspace 81 is located both within housing 1 and within partitioning device 8. Subspace 81 can have various shapes, such as cylindrical or prism-like. Prisms can be triangular, quadrangular, pentagonal, or hexagonal. For example, in FIG. 29 , subspace 81 is hexagonal.

[0392] There are multiple subspaces 81 inside the partition device 8, and the multiple subspaces 81 can be arranged along a certain direction. Taking the battery cell 10 as a rectangular parallelepiped shell 1 as an example, the multiple subspaces 81 can be arranged in the partition device 8 along the length, width or height direction of the battery cell 10; the multiple subspaces 81 can also be arranged in the partition device 8 along multiple directions, for example, the multiple subspaces 81 are arranged in multiple rows and columns in the partition device 8.

[0393] In this embodiment, the electrode assembly 2 may be cylindrical or flat, etc. As an example, in FIG29 , the electrode assembly 2 is cylindrical.

[0394] As an example, in Figure 29, along a first direction X, the first electrode tab 21 and the second electrode tab 22 are disposed at opposite ends of the main body 23, the first current collecting member 5 and the second current collecting member 6 are disposed on opposite sides of the plurality of electrode assemblies 2, and the first and second electrode posts are disposed on opposite walls of the outer casing 1. Along a second direction Y, a plurality of subspaces 81 are arranged within the partitioning device 8, and along a third direction Z, a plurality of subspaces 81 are arranged within the partitioning device 8. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X is parallel to the height of the outer casing 1, the second direction Y is parallel to the length of the outer casing 1, and the third direction Z is parallel to the width of the outer casing 1.

[0395] In this embodiment, after the electrode assembly 2 is accommodated in the subspace 81 , the separator 8 can bear the expansion force of the electrode assembly 2 in multiple directions, thereby improving the reliability of the battery cell 10 .

[0396] In some embodiments, please continue to refer to FIG. 30 , the partition device 8 includes a plurality of receiving units 83 disposed in the accommodating space, and a subspace 81 is formed inside each receiving unit 83 .

[0397] The plurality of receiving units 83 in the partitioning device 8 can be independent of each other, or at least two receiving units 83 can be connected together. As an example, in FIG30 , all receiving units 83 are connected to each other to form a whole. In the case of two adjacent receiving units 83, if the two receiving units 83 are connected to each other, they can be directly connected or indirectly connected via an intermediate connecting member. If the two adjacent receiving units 83 are directly connected, the outer surfaces of the two receiving units 83 can be directly connected, or the two receiving units 83 can share a wall portion.

[0398] The receiving unit 83 may be a hollow structure with an opening at one end or at two opposite ends. As an example, in FIG30 , the receiving unit 83 has openings at both ends along the first direction X, and the openings are connected to the subspace 81 .

[0399] In this embodiment, the plurality of receiving units 83 can each accommodate the electrode assembly 2, and the receiving units 83 can bear the expansion force of the electrode assembly 2 in multiple directions within the subspace 81. In addition, after the electrode assembly 2 is accommodated in the receiving units 83, the receiving units 83 can restrain the electrode assembly 2, reducing the risk of the electrode assembly 2 tilting or shaking inside the housing 1.

[0400] In some embodiments, two adjacent receiving units 83 share a partition wall 82 , and the partition wall 82 is configured to separate the subspaces 81 of the two adjacent receiving units 83 .

[0401] The partition wall 82 is a common wall portion of adjacent receiving units 83 , and the electrode assemblies 2 in two adjacent receiving units 83 are respectively located on both sides of the partition wall 82 .

[0402] As an example, in FIG30 , all the receiving units 83 in the partition device 8 are integrally formed, the receiving units 83 are in the shape of a hexagonal prism, the subspaces 81 in the receiving units 83 are also in the shape of a hexagonal prism, and the partition device 8 is in the shape of a honeycomb.

[0403] In this embodiment, two adjacent receiving units 83 share a partition wall 82. Given a fixed volume of the accommodation space, the volume of the subspace 81 can be increased to free up more space for the electrode assembly 2, thereby increasing the volumetric energy density of the battery cell 10. Furthermore, the shared partition wall 82 between two adjacent receiving units 83 allows the multiple receiving units 83 to function as a single unit, further simplifying the installation of the partition device 8 within the housing 1.

[0404] Please refer to Figure 31, which is a schematic diagram of the structure of the housing 1 provided in some embodiments of the present application. In embodiments where the partition wall 82 forms an accommodating cavity 821, the opening 16 through which the heat management component 9 enters the accommodating cavity 821 can be disposed on the outer surface of a wall portion of the housing 1 that is disposed opposite the partition wall 82 along the first direction X.

[0405] An embodiment of the present application provides a battery 100 , comprising the battery cell 10 provided in any one of the above embodiments.

[0406] An embodiment of the present application provides an electrical device, including the battery cell 10 provided in any one of the above embodiments, and the battery cell 10 is used to provide electrical energy.

[0407] An embodiment of the present application provides an energy storage device, comprising the battery cell 10 provided in any one of the above embodiments.

[0408] The energy storage device can be an energy storage container, an energy storage cabinet, etc.

[0409] According to some embodiments of the present application, as shown in Figures 12 to 16 , a battery cell 10 is provided. The battery cell 10 includes a housing 1, an electrode assembly 2, a first electrode terminal 3, a second electrode terminal 4, a first current collecting member 5, a second current collecting member 6, a first insulating member 71, a second insulating member 72, and a third insulating member 73. The housing 1 includes a shell 11 and an end cap 12. One end of the shell 11 forms an opening, and the end cap 12 seals the opening. The electrode assembly 2 includes a main body 23, a first electrode tab 21, and a second electrode tab 22. Along a first direction X, the first electrode tab 21 and the second electrode tab 22 of the plurality of electrode assemblies 2 are located at the same end of the main body 23. The first electrode tab 21 of the plurality of electrode assemblies 2 is located at the same end of the main body 23, and the second electrode tab 22 of the plurality of electrode assemblies 2 is located at the same end of the main body 23. Multiple electrode assemblies 2 are disposed within the housing 1. The plurality of electrode assemblies 2 are stacked along a second direction Y, and the end cap 12 is disposed on one side of the plurality of electrode assemblies 2 along the second direction Y. The first and second electrode terminals 3 and 4 are both disposed on the end cap 12, spaced apart along the third direction Z. The first, second, and third directions X and Y are perpendicular to each other. The first and second current collecting members 5 and 6 are both disposed within the housing 1, spaced apart along the third direction Z. The first current collecting member 5 includes a first connecting portion 52 and a third connecting portion 54, which are interconnected. The first connecting portion 52 is located on the side of the main body 23 where the first electrode tab 21 is located in the first direction X, and is welded to the first electrode tabs 21 of the plurality of electrode assemblies 2. The third connecting portion 54 is located between the end cap 12 and the plurality of electrode assemblies 2 in the second direction Y. A first protrusion 53 is provided on the surface of the third connecting portion 54 facing the end cap 12. The first protrusion 53 is welded to the first electrode terminal 3 to electrically connect the first electrode terminal 3 to the plurality of electrode assemblies 2. The first connecting portion 52 is provided with a first relief area 51, which extends through the first connecting portion 52 along the first direction X. The first electrode tab 21 passes through the first relief area 51 and connects to the side of the first connecting portion 52 facing away from the main portion 23. The first relief area 51 is a notch provided at the edge of the first connecting portion 52 in the third direction Z. The second current collecting member 6 includes a second connecting portion 62 and a fourth connecting portion 64, which are interconnected. The second connecting portion 62 is located on the side of the main portion 23 where the second electrode tab 22 is located in the first direction X and is welded to the second electrode tabs 22 of the plurality of electrode assemblies 2. The fourth connecting portion 64 is located between the end cap 12 and the plurality of electrode assemblies 2 in the second direction Y. A second protrusion 63 is provided on the surface of the fourth connecting portion 64 facing the end cap 12. The second protrusion 63 is welded to the second electrode terminal 4 to electrically connect the second electrode terminal 4 to the plurality of electrode assemblies 2.The second connecting portion 62 is provided with a second relief area 61, which extends through the second connecting portion 62 along the first direction X. The second tab 22 passes through the second relief area 61 and connects to the side of the second connecting portion 62 facing away from the main portion 23. The second relief area 61 is a notch provided on the edge of the second connecting portion 62 in the third direction Z. A first insulating member 71 is provided along the first direction X on the side of the first and second connecting portions 52, 62 facing away from the main portion 23 to insulate the first connecting portion 52 from the housing 1, and the second connecting portion 62 from the housing 1. A second insulating member 72 is provided along the first direction X between the first and second connecting portions 52, 62 and the main portion 23 to insulate the first and second connecting portions 52, 62 from the main portion 23, and the second connecting portion 62 from the main portion 23. A third insulating member 73 is provided along the second direction Y between the third and fourth connecting portions 54, 64 and the plurality of electrode assemblies 2 to insulate the third and fourth connecting portions 54 from the electrode assemblies 2, and the fourth and fourth connecting portions 64 from the electrode assemblies 2. Along the second direction Y, a first slot 731 is provided on the side of the third insulating member 73 facing away from the electrode assembly 2, and the third connecting portion 54 is accommodated in the first slot 731; a second slot 732 is provided on the side of the third insulating member 73 facing away from the electrode assembly 2, and the fourth connecting portion 64 is accommodated in the second slot 732.

[0410] The housing 1 is in the shape of a rectangular parallelepiped, the first direction X is parallel to the height direction of the housing 1, the second direction Y is parallel to the length direction of the housing 1, and the third direction Z is parallel to the width direction of the housing 1. The volume of the housing 1 is V, and the capacity of the battery cell 10 is C. The positive electrode material of the battery cell 10 includes lithium phosphate, 2.5dm 3 ≤V≤46dm 3 , 400Ah≤C≤5000Ah; or, the positive electrode material of the battery cell 10 includes lithium transition metal oxide, 1.4dm 3 ≤V≤40.6dm 3 , 400Ah≤C≤5000Ah; or, the battery cell 10 is a sodium battery, 3.5dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah.

[0411] In such a battery cell 10, the volume of the shell 1 and the capacity of the battery cell 10 are set within a reasonable range, so that the battery cell 10 will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of the large-capacity battery cell 10 and having better economy, so that the battery cell 10 will not be too large in volume and too small in capacity, thereby improving the volume energy density of the large-capacity battery cell 10, thus taking into account the economy and energy density requirements of the battery cell 10. In addition, with the battery cell 10 of this structure, the first electrode terminal 3 and the second electrode terminal 4 are provided on the end cover 12 in the second direction Y, so that the wall portion of the housing 1 facing the main body 23 in the first direction X is not provided with the first electrode terminal 3 and the second electrode terminal 4, thereby facilitating stacking of multiple battery cells 10 in the first direction X. On the other hand, the area where the first current collecting member 5 is connected to the first electrode terminal 3 and the area where the first current collecting member 5 is connected to the first electrode tab 21 can be separated from each other, and the area where the second current collecting member 6 is connected to the second electrode terminal 4 and the area where the second current collecting member 6 is connected to the second electrode tab 22 can be separated from each other, which is conducive to reducing the difficulty of assembling the first current collecting member 5 with the first electrode terminal 3 and the first tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second tab 22, and reducing the interference problem between the first electrode terminal 3 and the first tab 21 and between the second electrode terminal 4 and the second tab 22. When the second electrode terminal 4 and the second electrode tab 22 are both welded to the second current collecting member 6, the mutual influence between the welding molten pool of the first electrode terminal 3 and the first current collecting member 5 and the welding molten pool of the first electrode tab 21 and the first current collecting member 5 can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal 4 and the second current collecting member 6 and the welding molten pool of the second electrode tab 22 and the second current collecting member 6 can be reduced, which is conducive to improving the assembly quality and stability of the first electrode terminal 3 and the first electrode tab 21 connected to the first current collecting member 5, and the second electrode terminal 4 and the second electrode tab 22 connected to the second current collecting member 6.

[0412] 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.

[0413] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery cell, comprising a housing and an electrode assembly, wherein the electrode assembly is contained in the housing, the volume of the housing is V, the capacity of the battery cell is C, and the following conditions are met: 1.4 dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah.

2. The battery cell according to claim 1, wherein: The positive electrode material of the battery cell includes lithium phosphate, 2.5dm 3 ≤V≤46dm 3 .

3. The battery cell according to claim 2, wherein: 400Ah≤C≤1500Ah,2.5dm 3 ≤V≤13.8dm 3 。 4. The battery cell according to claim 2, wherein: 1500Ah<C≤3000Ah,9.6dm 3 ≤V≤27.6dm 3 。 5. The battery cell according to claim 2, wherein: <h2 style=";text-align:left;direction:ltr">3000Ah<C≤5000Ah,19.3dm<h2 style=";text-align:left;direction:ltr"> 3 <h2 style=";text-align:left;direction:ltr"> ≤V≤46dm<h2 style=";text-align:left;direction:ltr"> 3 <h2 style=";text-align:left;direction:ltr"> 。 6. The battery cell according to claim 1, wherein: The positive electrode material of the battery cell includes lithium transition metal oxide, 1.4dm 3 ≤V≤40.6dm 3 .

7. The battery cell according to claim 6, wherein: 400Ah≤C≤1500Ah,1.4dm 3 ≤V≤12.2dm 3 。 8. The battery cell according to claim 6, wherein: 1500Ah<C≤3000Ah,6.2dm 3 ≤V≤24.4dm 3 。 9. The battery cell according to claim 6, wherein: 3000Ah<C≤5000Ah,12.4dm 3 ≤V≤40.6dm 3 。 10. The battery cell according to claim 1, wherein: The battery cell is a sodium battery, 3.5dm 3 ≤V≤65dm 3 .

11. The battery cell according to claim 10, wherein: 400Ah≤C≤1500Ah,3.5dm 3 ≤V≤19.4dm 3 。 12. The battery cell according to claim 10, wherein: 1500Ah<C≤3000Ah,13.8dm 3 ≤V≤38.7dm 3 。 13. The battery cell according to claim 10, wherein: 3000Ah<C≤5000Ah,27.6dm 3 ≤V≤65dm 3 。 14. The battery cell according to any one of claims 1 to 13, wherein: The volume of the electrode assembly is V1, and the number of the electrode assemblies contained in the housing is N, satisfying: 0.2dm 3 ≤V1≤7.8dm 3 , N≥5.

15. The battery cell according to any one of claims 1 to 14, wherein: The electrode assembly comprises a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab have opposite polarities, and the first electrode tab and the second electrode tab are arranged on the main body; The battery cell includes a first current collecting member, a second current collecting member and a plurality of electrode assemblies. Along a first direction, the first pole tabs of the plurality of electrode assemblies are located at the same end of the main body, the second pole tabs of the plurality of electrode assemblies are located at the same end of the main body, the first current collecting member connects the first pole tabs of the plurality of electrode assemblies, and the second current collecting member connects the second pole tabs of the plurality of electrode assemblies.

16. The battery cell according to claim 15, wherein: Along the first 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.

17. The battery cell according to claim 16, 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 first 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.

18. The battery cell according to claim 17, wherein: 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.

19. The battery cell according to any one of claims 15 to 18, wherein: The first current collecting component is arranged inside the shell; or, the first current collecting component is arranged outside the shell, and along the first direction, the shell is provided with a first channel for each first pole ear to extend out, and each first pole ear extends out of the shell through the corresponding first channel and is connected to the first current collecting component.

20. The battery cell according to claims 15-19, wherein: Along the first 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.

21. The battery cell according to claim 20, wherein: The second current collecting member is provided with a second avoidance area, the second avoidance area penetrates the second current collecting member along the first 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.

22. The battery cell according to claim 21, wherein: 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.

23. The battery cell according to any one of claims 15 to 22, wherein: The second current collecting component is arranged inside the shell; or, the second current collecting component is arranged outside the shell, and along the first direction, the shell is provided with a second channel for each second pole ear to extend out, and each first pole ear extends out of the shell through the corresponding second channel and is connected to the second current collecting component.

24. The battery cell according to any one of claims 15 to 23, wherein: Along the first direction, the first pole lug and the second pole lug are both arranged at the same end of the main body; Among them, the first current collecting member includes a first connecting portion connecting each of the first pole lugs, and the second current collecting member includes a second connecting portion connecting each of the second pole lugs, and the first connecting portion and the second connecting portion are both located on one side of the main body portion where the first pole lug and the second pole lug are arranged in the first direction, and the first connecting portion and the second connecting portion are arranged at intervals.

25. The battery cell according to claim 24, wherein: The battery cell comprises: A first insulating member is disposed along the first direction at 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 housing and the second connecting portion from the housing.

26. The battery cell according to claim 24 or 25, wherein: The battery cell comprises: The second insulating member is disposed along the first direction on one side of the first connecting portion and the second connecting portion facing the main body to insulate and isolate the first connecting portion from the main body and the second connecting portion from the main body.

27. The battery cell according to any one of claims 24 to 26, wherein: Along the first direction, the housing includes a first wall portion, and the first current collecting member and the second current collecting member are both arranged on a side of the main body portion facing the first wall portion; The first wall portion is provided with a first electrode terminal and a second electrode terminal, and the first current collecting member and the second current collecting member are connected to the first electrode terminal and the second electrode terminal, respectively.

28. The battery cell according to any one of claims 24 to 26, wherein: The plurality of electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; The first current collecting member includes a third connection portion connected to the first connection portion, the second current collecting member includes a fourth connection portion connected to the second connection portion, and along the second direction, the housing includes a second wall portion, and the third connection portion and the fourth connection portion are both located on a side of the plurality of electrode assemblies facing the second wall portion; The second wall portion is provided with a first electrode terminal and a second electrode terminal, and the third connecting portion and the fourth connecting portion are connected to the first electrode terminal and the second electrode terminal respectively.

29. The battery cell according to claim 28, wherein: The battery cell comprises: A third insulating member is disposed along the second direction on one side of the third connecting portion and the fourth connecting portion facing the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assembly and the fourth connecting portion from the electrode assembly.

30. The battery cell according to claim 29, wherein: Along the second direction, a first card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the third connecting portion is accommodated in the first card slot; and / or, along the second direction, a second card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the fourth connecting portion is accommodated in the second card slot.

31. The battery cell according to any one of claims 24 to 26, wherein: The plurality of electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; The first current collecting member includes a third connection portion, the third connection portion is connected to the first connection portion, the second current collecting member includes a fourth connection portion, the fourth connection portion is connected to the second connection portion, along the second direction, the housing includes a second wall portion and a third wall portion that are oppositely arranged, the third connection portion is located on a side of the plurality of electrode assemblies facing the second wall portion, and the fourth connection portion is located on a side of the plurality of electrode assemblies facing the third wall portion; The second wall portion is provided with a first electrode terminal, the third wall portion is provided with a second electrode terminal, and the third connecting portion and the fourth connecting portion are connected to the first electrode terminal and the second electrode terminal respectively.

32. The battery cell according to claim 31, wherein: The battery cell comprises: a third insulating member, disposed between the third connecting portion and the plurality of electrode assemblies along the second direction to insulate and isolate the third connecting portion from the electrode assemblies; A fourth insulating member is disposed between the fourth connecting portion and the plurality of electrode assemblies along the second direction to insulate and isolate the fourth connecting portion from the electrode assemblies.

33. The battery cell according to claim 32, wherein: Along the second direction, a first card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the third connecting portion is accommodated in the first card slot; and / or, along the second direction, a second card slot is provided on the side of the fourth insulating member facing away from the multiple electrode assemblies, and the fourth connecting portion is accommodated in the second card slot.

34. The battery cell according to any one of claims 15 to 23, wherein: Along the first direction, the first pole lug and the second pole lug are respectively arranged at two opposite ends of the main body; The first current collecting member includes a first connecting portion connecting each of the first pole tabs, the first connecting portion is located on a side of the main body on which the first pole tabs are arranged in the first direction, and the second current collecting member includes a second connecting portion connecting each of the second pole tabs, the second connecting portion is located on a side of the main body on which the second pole tabs are arranged in the first direction.

35. The battery cell according to claim 34, wherein: The battery cell comprises: Two first insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the first 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.

36. The battery cell according to claim 34 or 35, wherein: The battery cell comprises: Two second insulating members are respectively arranged on both sides of the plurality of electrode assemblies along the first direction. Along the first direction, one second insulating member is located on the side of the first connecting part facing the main body to insulate and isolate the first connecting part and the main body, and the other second insulating member is located on the side of the second connecting part facing the main body to insulate and isolate the second connecting part and the main body.

37. The battery cell according to any one of claims 34 to 36, wherein: The plurality of electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; The first current collecting member includes a third connection portion connected to the first connection portion, the second current collecting member includes a fourth connection portion connected to the second connection portion, and along the second direction, the housing includes a first wall portion, and the third connection portion and the fourth connection portion are both located on a side of the plurality of electrode assemblies facing the first wall portion; The first wall portion is provided with a first electrode terminal and a second electrode terminal, and the third connecting portion and the fourth connecting portion are connected to the first electrode terminal and the second electrode terminal respectively.

38. The battery cell according to claim 37, wherein: The battery cell comprises: A third insulating member is disposed along the second direction on one side of the third connecting portion and the fourth connecting portion facing the plurality of electrode assemblies to insulate and isolate the third connecting portion from the electrode assembly and the fourth connecting portion from the electrode assembly.

39. The battery cell according to claim 38, wherein: Along the second direction, a first card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the third connecting portion is accommodated in the first card slot; and / or, along the second direction, a second card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the fourth connecting portion is accommodated in the second card slot.

40. The battery cell according to any one of claims 34 to 36, wherein: The plurality of electrode assemblies are arranged along a second direction, and the second direction intersects with the first direction; The first current collecting member includes a third connection portion, the third connection portion is connected to the first connection portion, the second current collecting member includes a fourth connection portion, the fourth connection portion is connected to the second connection portion, along the second direction, the housing includes a first wall portion and a second wall portion that are oppositely arranged, the third connection portion is located on a side of the plurality of electrode assemblies facing the first wall portion, and the fourth connection portion is located on a side of the plurality of electrode assemblies facing the second wall portion; The first wall portion is provided with a first electrode terminal, the second wall portion is provided with a second electrode terminal, and the third connecting portion and the fourth connecting portion are connected to the first electrode terminal and the second electrode terminal respectively.

41. The battery cell according to claim 40, wherein: The battery cell comprises: a third insulating member, disposed between the third connecting portion and the plurality of electrode assemblies along the second direction to insulate and isolate the third connecting portion from the electrode assemblies; A fourth insulating member is disposed between the fourth connecting portion and the plurality of electrode assemblies along the second direction to insulate and isolate the fourth connecting portion from the electrode assemblies.

42. The battery cell according to claim 41, wherein: Along the second direction, a first card slot is provided on the side of the third insulating member facing away from the multiple electrode assemblies, and the third connecting portion is accommodated in the first card slot; and / or, along the second direction, a second card slot is provided on the side of the fourth insulating member facing away from the multiple electrode assemblies, and the fourth connecting portion is accommodated in the second card slot.

43. The battery cell according to any one of claims 1 to 42, wherein: The battery cell comprises a plurality of electrode assemblies, the housing has a receiving space, and the plurality of electrode assemblies are received in the receiving space; The battery cell includes a partition device, which is disposed in the accommodation space and configured to partition the accommodation space into a plurality of subspaces, each of which accommodates at least one electrode assembly.

44. The battery cell according to claim 43, wherein: The partition device comprises a partition wall, the partition wall is configured to separate two adjacent sub-spaces, and a receiving cavity is formed inside the partition wall; The battery cell includes a heat management component, and the heat management component is accommodated in the accommodation cavity.

45. The battery cell according to claim 44, wherein: The outer surface of the housing is provided with an opening for the heat management component to enter the accommodating cavity, and the opening is communicated with the accommodating cavity.

46. ​​The battery cell according to any one of claims 43 to 45, wherein: The partition device includes at least one partition wall, which is disposed in the accommodating space and connected to the outer shell, and is configured to separate two adjacent sub-spaces.

47. The battery cell according to claim 46, wherein: The plurality of electrode assemblies are arranged along a second direction, the partition device comprises a plurality of partition walls, and along the second direction, the plurality of partition walls are spaced apart in the accommodation space.

48. The battery cell according to any one of claims 43 to 45, wherein: The subspace is formed inside the partitioning device.

49. The battery cell according to claim 48, wherein: The partition device comprises a plurality of receiving units arranged in the accommodating space, and a subspace is formed inside each of the receiving units.

50. The battery cell according to claim 49, wherein: Two adjacent storage units share a partition wall, and the partition wall is configured to separate the subspaces of the two adjacent storage units.

51. A battery comprising the battery cell according to any one of claims 1 to 50.

52. An electrical device comprising the battery cell according to any one of claims 1 to 50, wherein the battery cell is used to provide electrical energy.

53. An energy storage device comprising the battery cell according to any one of claims 1-50.

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