Battery monomer, battery, electric equipment and energy storage device

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment and an energy storage device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the volume of the shell is V, the capacitance of the battery monomer is C, and V is greater than or equal to 1.4 dm < 3 > and less than or equal to 65 dm < 3 >, and C is greater than or equal to 400 Ah and less than or equal to 5000 Ah. Therefore, the condition that the volume of the single battery is too small and the capacitance is too large is avoided, so that the manufacturing cost of the large-capacity single battery is reduced, better economical efficiency is achieved, the condition that the volume of the single battery is too large and the capacitance is too small is also avoided, and the volume energy density of the large-capacity single battery is improved. Therefore, the economical efficiency and energy density requirements of the battery monomer are considered.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have higher requirements in terms of performance.

[0003] A battery usually includes multiple battery cells, which are usually connected in series, in parallel, or in a mixed connection. At present, the volume and capacity of battery cells are relatively small. If the large capacity requirements of the battery need to be met, more battery cells need to be set in the battery. As the number of battery cells increases, the number of parts connecting multiple battery cells increases, the battery management system and wire materials are used in large quantities, and the cost of the battery is high. In order to reduce costs, the capacity of the battery cells can be increased, thereby reducing the number of battery cells in the battery. At present, it is difficult to take into account both economic and energy density requirements for large-capacity battery cells. Summary of the invention

[0004] 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.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including 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.

[0006] 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.

[0007] In some embodiments, the positive electrode material of the battery cell includes a lithium-containing phosphate, 2.5 dm 3 ≤V≤46dm 3For battery cells containing lithium phosphate as the positive electrode material, the volume of the housing is controlled to 2.5 dm 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.

[0008] In some embodiments, 400Ah≤C≤1500Ah, 2.5dm 3 ≤V≤13.8dm 3 The volume and capacity of the positive electrode material including the battery cell containing lithium phosphate are more matched, and the battery cell of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, and the battery cell will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0009] In some embodiments, 1500Ah<C≤3000Ah, 9.6dm 3 ≤V≤27.6dm 3 The volume and capacity of the positive electrode material including the battery cell containing lithium phosphate are more matched, and the battery cell of 1500Ah<C≤3000Ah will not be too small in volume 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 volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0010] In some embodiments, 3000Ah<C≤5000Ah, 19.3dm 3 ≤V≤46dm 3 The volume and capacity of the positive electrode material including the battery cell containing lithium phosphate are more matched, and the battery cell of 3000Ah<C≤5000Ah will not be too small in volume 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 volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0011] In some embodiments, the positive electrode material of the battery cell includes a lithium transition metal oxide, 1.4 dm 3 ≤V≤40.6dm 3 For battery cells whose cathode materials include lithium transition metal oxides, the volume of the outer shell 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.

[0012] In some embodiments, 400Ah≤C≤1500Ah, 1.4dm 3 ≤V≤12.2dm 3 The volume and capacity of the battery cell whose positive electrode material includes lithium transition metal oxide are more matched, and the battery cell of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, and the battery cell will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0013] In some embodiments, 1500Ah<C≤3000Ah, 6.2dm 3 ≤V≤24.4dm 3 The volume and capacity of the battery cell whose positive electrode material includes lithium transition metal oxide are more matched, and the battery cell of 1500Ah<C≤3000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, and the battery cell will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0014] In some embodiments, 3000Ah<C≤5000Ah, 12.4dm 3 ≤V≤40.6dm 3 The volume and capacity of the battery cell whose positive electrode material includes lithium transition metal oxide are more matched, and the battery cell of 3000Ah<C≤5000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, and the battery cell will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0015] In some embodiments, the battery cell is a sodium battery, 3.5dm 3 ≤V≤65dm 3 For sodium batteries, the volume of the casing 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.

[0016] In some embodiments, 400Ah≤C≤1500Ah, 3.5dm 3 ≤V≤19.4dm 3 The volume and capacity of the sodium battery are more matched, and the battery cells of 400Ah≤C≤1500Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, so that the battery cells will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0017] In some embodiments, 1500Ah<C≤3000Ah, 13.8dm 3 ≤V≤38.7dm 3 The volume and capacity of the sodium battery are more matched, and the battery cell of 1500Ah<C≤3000Ah will not be too small in volume 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 volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0018] In some embodiments, 3000Ah<C≤5000Ah, 27.6dm 3 ≤V≤65dm 3 The volume and capacity of the sodium battery are more matched, and the battery cells of 3000Ah<C≤5000Ah will not be too small in volume and too large in capacity, thereby reducing the manufacturing cost of large-capacity battery cells and having better economy, so that the battery cells will not be too large in volume and too small in capacity, thereby improving the volume energy density of large-capacity battery cells.

[0019] In some embodiments, the volume of the electrode assembly is V 1 The number of electrode assemblies contained in the housing is N, satisfying: 0.2dm 3 ≤V 1 ≤7.8dm 3 , N ≥ 5. The volume of the electrode assembly is controlled at 0.2dm 3 ~7.8dm 3 , which can reduce the manufacturing difficulty and manufacturing cost of electrode assemblies. And N ≥ 5 can achieve the large capacity requirements of battery cells. In other words, 0.2dm 3 ≤V 1 ≤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.

[0020] In some embodiments, the electrode assembly includes a main body, a first pole ear and a second pole ear, the first pole ear and the second pole ear have opposite polarities, and the first pole ear and the second pole ear 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 ears of the plurality of electrode assemblies are located at the same end of the main body, the second pole ears 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 ears of the plurality of electrode assemblies, and the second current collecting member connects the second pole ears of the plurality of electrode assemblies. The first pole ears of the plurality of electrode assemblies are connected by the first current collecting member, so that the first pole ears of the plurality of electrode assemblies are connected, and the second pole ears of the plurality of electrode assemblies are connected by the second current collecting member, so that the second pole ears of the plurality of electrode assemblies are connected, and the volume of a single electrode assembly does not need to be enlarged, which can reduce the manufacturing difficulty of a large-capacity battery cell.

[0021] 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 pole ear is provided, and a portion of the first pole ear is located on a side of the first current collecting member away from the main body and connected to the first current collecting member. By disposing at least a portion of the first current collecting member on a side of the main body where the first pole ear is provided, so as to facilitate the connection of the first current collecting member with the first pole ear, it is helpful to reduce the difficulty of assembling the first current collecting member and the first pole ear. In addition, by disposing a portion of the first pole ear on a side of the first current collecting member away from the main body in the first direction, and the portion is connected to the first current collecting member, so that the first pole ear is a structure that bypasses the first current collecting member and is connected to the side of the first current collecting member away from the main body, on the one hand, it can reduce the difficulty of connecting the first pole ear with the first current collecting member, and on the other hand, it can reduce the phenomenon that the first current collecting member presses the first pole ear in the direction close to the main body, so as to reduce the risk of short circuit caused by the first pole ear being inserted into the main body.

[0022] In some embodiments, a first avoidance area is provided on the first current collecting member, the first avoidance area penetrates the first current collecting member along a first direction, and the first pole ear passes through the first avoidance area and is connected to the side of the first current collecting member away from the main body. By providing the first avoidance area on the first current collecting member, and the first avoidance area penetrates the first current collecting member along the first direction, the first pole ear can pass through the first avoidance area and then be connected to the side of the first current collecting member away from the main body. The battery cell adopting this structure is convenient for setting the first pole ear to be connected to the side of the first current collecting member away from the main body, which can reduce the difficulty of the first pole ear bypassing the first current collecting member, and can optimize the length of the first pole ear bypassing the first current collecting member, thereby alleviating the phenomenon of redundancy of the first pole ear, and can reduce the manufacturing cost of the battery cell.

[0023] In some embodiments, the first avoidance area is a through hole provided on the first current collecting member; or, the first avoidance area is a notch provided on the edge of the first current collecting member. The first avoidance area can be a through hole provided on the first current collecting member or a notch provided at the edge of the first current collecting member, so that the first electrode tab passes through the first avoidance area and is connected to the side of the first current collecting member away from the main body, which has a simple structure and is easy to manufacture.

[0024] In some embodiments, the first current collecting member is disposed inside the housing; or, the first current collecting member is disposed outside the housing, and the housing is provided with a first hole for each first pole ear to extend out along the first direction, and each first pole ear extends out of the housing through the corresponding first hole and is connected to the first current collecting member. By arranging the first current collecting member inside the housing, it is helpful to reduce the difficulty of assembling the first pole ear and the first current collecting member, so as to improve the production efficiency of the battery cell, and the housing can play a certain protective role on the first current collecting member, so as to reduce the phenomenon of wear or damage of the first current collecting member during use. By arranging the first current collecting member outside the housing, and the housing is provided with a first hole for the first pole ear to pass through, the battery cell adopting this structure can, on the one hand, reduce the internal space of the housing occupied by the first current collecting member, so as to free up more space for the electrode assembly, which is beneficial to improve the volume energy density of the battery cell, and on the other hand, it is convenient to inspect the first current collecting member later, and it is convenient to maintain and replace the first current collecting member, which is beneficial to reduce the maintenance cost of the battery cell.

[0025] In some embodiments, along the first direction, at least a portion of the second current collecting member is located on a side of the main body where the second pole ear is provided, and a portion of the second pole ear is located on a side of the second current collecting member away from the main body and connected to the second current collecting member. By disposing at least a portion of the second current collecting member on a side of the main body where the second pole ear is provided, so as to facilitate the connection of the second current collecting member with the second pole ear, it is helpful to reduce the difficulty of assembling the second current collecting member and the second pole ear. In addition, by disposing a portion of the second pole ear on a side of the second current collecting member away from the main body in the first direction, and the portion is connected to the second current collecting member, so that the second pole ear is a structure that bypasses the second current collecting member and is connected to the side of the second current collecting member away from the main body, on the one hand, the difficulty of connecting the second pole ear with the second current collecting member can be reduced, and on the other hand, the phenomenon that the second current collecting member presses the second pole ear in a direction close to the main body can be reduced, so as to reduce the risk of short circuit caused by the second pole ear being inserted into the main body.

[0026] In some embodiments, a second avoidance area is provided on the second current collecting member, the second avoidance area penetrates the second current collecting member along the first direction, and the second pole ear passes through the second avoidance area and is connected to the side of the second current collecting member away from the main body. By providing the second avoidance area on the second current collecting member, and the second avoidance area penetrates the second current collecting member along the first direction, the second pole ear can pass through the second avoidance area and then be connected to the side of the second current collecting member away from the main body. The battery cell adopting this structure facilitates the second pole ear to be set as a structure connected to the side of the second current collecting member away from the main body, which can reduce the difficulty of the second pole ear bypassing the second current collecting member, and can optimize the length of the second pole ear bypassing the second current collecting member, thereby alleviating the phenomenon of redundancy of the second pole ear, and can reduce the manufacturing cost of the battery cell.

[0027] In some embodiments, the second avoidance area is a through hole provided on the second current collecting member; or, the second avoidance area is a notch provided on the edge of the second current collecting member. The second avoidance area can be a through hole provided on the second current collecting member or a notch provided at the edge of the second current collecting member, so that the second electrode tab passes through the second avoidance area and is connected to the side of the second current collecting member away from the main body, which has a simple structure and is easy to manufacture.

[0028] In some embodiments, the second current collecting member is disposed inside the housing; or, the second current collecting member is disposed outside the housing, and along the first direction, the housing is provided with a second hole for each second pole ear to extend out, and each second pole ear extends out of the housing through the corresponding second hole and is connected to the second current collecting member. By arranging the second current collecting member inside the housing, it is helpful to reduce the difficulty of assembling the second pole ear and the second current collecting member, so as to improve the production efficiency of the battery cell, and the housing can play a certain protective role on the second current collecting member, so as to reduce the phenomenon of wear or damage of the second current collecting member during use. By arranging the second current collecting member outside the housing, and the housing is provided with a second hole for the second pole ear to pass through, the battery cell adopting this structure can, on the one hand, reduce the internal space of the housing occupied by the second current collecting member, so as to free up more space for the electrode assembly, which is beneficial to improve the volume energy density of the battery cell, and on the other hand, it is convenient to inspect the second current collecting member later, and it is convenient to maintain and replace the second current collecting member, which is beneficial to reduce the maintenance cost of the battery cell.

[0029] In some embodiments, along the first direction, the first pole lug and the second pole lug are both arranged at the same end of the main body; wherein the first current collecting member includes a first connection portion connecting each first pole lug, the second current collecting member includes a second connection portion connecting each second pole lug, the first connection portion and the second connection portion are both located at the side of the main body where the first pole lug and the second pole lug are arranged in the first direction, and the first connection portion and the second connection portion are arranged at intervals. By arranging the first pole lug and the second pole lug at the same end of the main body in the first direction, and the first connection portion of the first current collecting member and the second connection portion of the second current collecting member are both located at the side of the main body where the first pole lug and the second pole lug are arranged, on the one hand, it is convenient to connect the first current collecting member with the first pole lug, and to connect the second current collecting member with the second pole lug, which is conducive to reducing the difficulty of assembling the first current collecting member and the second current collecting member, and on the other hand, the first current collecting member and the second current collecting member can share space in the first direction, which is conducive to saving the space occupied by the first current collecting member and the second current collecting member in the first direction, thereby improving the space utilization rate of the battery cell, so as to improve the volume energy density of the battery cell.

[0030] In some embodiments, the battery cell includes a first insulating member, which is arranged along the first direction on the side of the first connection part and the second connection part away from the main body to insulate and isolate the first connection part from the shell and the second connection part from the shell. In this way, the first insulating member is located between the first connection part and the second connection part and the shell in the first direction. On the one hand, the battery cell adopting this structure can achieve insulation isolation between the first connection part and the shell and between the second connection part and the shell, which is conducive to reducing the risk of short circuit between the first current collecting member and the second current collecting member and the shell. On the other hand, it can achieve that the first connection part of the first current collecting member and the second connection part of the second current collecting member share a first insulating member, which is conducive to optimizing the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0031] In some embodiments, the battery cell includes a second insulating member, which is arranged on the side of the first connection part and the second connection part facing the main body along the first direction to insulate and isolate the first connection part from the main body and the second connection part from the main body. In this way, the second insulating member is located between the first connection part and the second connection part and the main body in the second direction. On the one hand, the battery cell adopting this structure can achieve insulation isolation between the first connection part and the main body and between the second connection part and the main body, which is conducive to reducing the risk of short circuit between the first current collecting member and the second current collecting member and the main body. On the other hand, it can achieve that the first connection part of the first current collecting member and the second connection part of the second current collecting member share a second insulating member, which is conducive to optimizing the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0032] In some embodiments, 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 disposed on a side of the main body facing the first wall portion; wherein 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. By disposing the first current collecting member and the second current collecting member on a side of the main body facing the first wall portion, and disposing the first electrode terminal and the second electrode terminal, respectively connected to the first current collecting member and the second current collecting member, on the first wall portion, the distance between the first electrode terminal and the first electrode tab and between the second electrode terminal and the second electrode tab can be reduced, which is conducive to reducing the size of the first current collecting member and the second current collecting member, and reducing the current flow path from the first electrode tab to the first electrode terminal and from the second electrode tab to the second electrode terminal.

[0033] In some embodiments, a plurality of electrode assemblies are arranged along a second direction, 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, 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; wherein the second wall portion is provided with a first electrode terminal and a second electrode terminal, the third connection portion and the fourth connection 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 portion arranged along the second direction, so that the second wall portion is in the same arrangement direction as the plurality of electrode assemblies. The first current collecting member has a third connection portion connected to the first connection portion, and the second current collecting member has a fourth connection portion connected to the second connection portion. The third connection portion is connected to the first electrode terminal disposed on the second wall portion, and the first connection portion is connected to the first electrode tabs of the plurality of electrode assemblies, so that the first electrode tab is electrically connected to the first electrode terminal through the first current collecting member. The fourth connection portion is connected to the second electrode terminal disposed on the second wall portion, and the second connection portion is connected to the second electrode tabs of the plurality of electrode assemblies, so that 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 is possible to separate the area where the first current collecting member is connected to the first electrode terminal and the area where the first current collecting member is connected to the first pole lug, and to separate the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole lug, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole lug, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole lug, and can reduce the interference problem between the first electrode terminal and the first pole lug and between the second electrode terminal and the second pole lug. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0034] In some embodiments, the battery cell includes a third insulating member, which is disposed along the second direction on the side of the third connection portion and the fourth connection portion facing the plurality of electrode assemblies to insulate and isolate the third connection portion from the electrode assembly and the fourth connection portion from the electrode assembly. The provision of the third insulating member can, on the one hand, achieve insulation isolation between the third connection portion and the electrode assembly and between the fourth connection portion and the electrode assembly, which is beneficial to reducing the risk of short circuits. On the other hand, the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member can share a third insulating member, which is beneficial to optimizing the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0035] In some embodiments, along the second direction, a first slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the third connection portion is accommodated in the first slot; and / or, along the second direction, a second slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the fourth connection portion is accommodated in the second slot. By providing the first slot on the side of the third insulating member away from the electrode assembly along the second direction, the third connection portion of the first current collecting member can be accommodated in the first slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing the second slot on the side of the third insulating member away from the electrode assembly along the second direction, the fourth connection portion of the second current collecting member can be accommodated in the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connection portion and the plurality of electrode assemblies, and the third insulating member and the fourth connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0036] 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 second wall portion and a third wall portion that are oppositely arranged, and the third connection portion is located on a side of the multiple electrode assemblies facing the second wall portion, and the fourth connection portion is located on a side of the multiple 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 to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal, and on the other hand, it is possible to realize that the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are far apart, 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.

[0037] In some embodiments, the battery cell includes a third insulating member and a fourth insulating member; the third insulating member is disposed between the third connection portion and the plurality of electrode assemblies along the second direction to insulate and isolate the third connection portion and the electrode assembly; the fourth insulating member is disposed between the fourth connection portion and the plurality of electrode assemblies along the second direction to insulate and isolate the fourth connection portion and the electrode assembly. By disposing the third insulating member between the third connection portion and the plurality of electrode assemblies, and disposing the fourth insulating member between the fourth connection portion and the plurality of electrode assemblies, insulation isolation between the third connection portion and the plurality of electrode assemblies and between the fourth connection portion and the plurality of electrode assemblies can be achieved, thereby reducing the risk of short circuit inside the battery cell and improving the reliability of the battery cell.

[0038] In some embodiments, along the second direction, a first card slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the third connection 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 away from the plurality of electrode assemblies, and the fourth connection portion is accommodated in the second card slot. By providing the first card slot on the side of the third insulating member away from the plurality of electrode assemblies along the second direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating member assembled between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share space in the first direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing the second card slot on the side of the fourth insulating member away from the plurality of electrode assemblies along the second direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the fourth insulating member assembled between the fourth connection portion and the plurality of electrode assemblies, and the fourth insulating member and the fourth connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0039] In some embodiments, along the first direction, the first pole tab and the second pole tab are respectively arranged at opposite ends of the main body; wherein the first current collecting member includes a first connection portion connecting each first pole tab, the first connection portion is located at one side of the main body where the first pole tab is arranged in the first direction, and the second current collecting member includes a second connection portion connecting each second pole tab, the second connection portion is located at one side of the main body where the second pole tab is arranged in the first direction. By respectively arranging the first pole tab and the second pole tab at both ends of the main body in the first direction, and respectively arranging the first connection portion of the first current collecting member and the second connection portion of the second current collecting member at both sides of the plurality of electrode assemblies in the first direction, on the one hand, it is convenient for the first current collecting member and the second current collecting member to be connected to the first pole tab and the second pole tab respectively, which is conducive to alleviating the mutual interference between the first current collecting member and the second current collecting member, and on the other hand, it is possible to make the first pole tab and the second pole tab with opposite polarities away from each other, and to make the first connection portion of the first current collecting member and the second connection portion of the second current collecting member away from each other, which is conducive to reducing the risk of short circuit between the first pole tab and the second pole tab and between the first current collecting member and the second current collecting member, so as to improve the reliability of the battery cell.

[0040] In some embodiments, the battery cell includes two first insulating members, which are respectively arranged on both sides of the plurality of electrode assemblies along the first direction, one first insulating member is located on the side of the first connection part away from the main body to insulate and isolate the first connection part from the shell, and the other first insulating member is located on the side of the second connection part away from the main body to insulate and isolate the second connection part from the shell. In this way, the first insulating member is provided between the first connection part and the shell and between the second connection part and the shell, so that the first connection part and the shell and the second connection part and the shell can be insulated and isolated respectively by the two first insulating members, which is conducive to reducing the risk of short circuit between the first current collecting member, the second current collecting member and the shell, so as to improve the reliability of the battery cell.

[0041] In some embodiments, the battery cell includes two second insulating members, which 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 connection part facing the main body to insulate and isolate the first connection part from the main body, and the other second insulating member is located on the side of the second connection part facing the main body to insulate and isolate the second connection part from the main body. In this way, the second insulating member is arranged between the first connection part and the main body and between the second connection part and the main body, so that the insulation isolation between the first connection part and the main body and between the second connection part and the main body can be achieved respectively through the two second insulating members, which is conducive to reducing the risk of short circuit between the first current collecting member, the second current collecting member and the main body, so as to improve the reliability of the battery cell.

[0042] 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; the second current collecting member includes a fourth connection portion, which is connected to the second connection portion; 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; wherein the first wall portion is provided with a first electrode terminal and 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. The first electrode terminal and the second electrode terminal are both provided on the first wall portion, and the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member are both provided on a side of the plurality of electrode assemblies facing the first wall portion, which facilitates the connection of the third connection portion of the first current collecting member with the first electrode terminal and the connection of the fourth connection portion of the second current collecting member with the second electrode terminal, and enables the battery cell to be a structure in which the first electrode terminal and the second electrode terminal are provided at the same end in the second direction, and enables the third connection portion and the fourth connection portion to share a space in the second direction, thereby improving the space utilization rate of the battery cell and improving the volume energy density of the battery cell. In addition, in a battery cell adopting such a structure, the first electrode terminal and the second electrode terminal are arranged on the first wall portion in the second direction, so that the wall portion of the outer shell facing the main body along the first direction is not provided with the first electrode terminal and the second electrode terminal, thereby facilitating stacking of multiple battery cells along the first direction, and on the other hand, it is possible to separate the area where the first current collecting member is connected to the first electrode terminal and the area where the first current collecting member is connected to the first pole lug, and it is possible to separate the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole lug, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole lug, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole lug, and it is possible to reduce the interference problem between the first electrode terminal and the first pole lug and between the second electrode terminal and the second pole lug. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0043] In some embodiments, the battery cell includes a third insulating member, which is disposed along the second direction on the side of the third connection portion and the fourth connection portion facing the plurality of electrode assemblies to insulate and isolate the third connection portion from the electrode assembly and the fourth connection portion from the electrode assembly. The provision of the third insulating member can, on the one hand, achieve insulation isolation between the third connection portion and the electrode assembly and between the fourth connection portion and the electrode assembly, which is beneficial to reducing the risk of short circuits. On the other hand, the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member can share a third insulating member, which is beneficial to optimizing the assembly process of the battery cell and can reduce the manufacturing cost of the battery cell.

[0044] In some embodiments, along the second direction, a first slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the third connection portion is accommodated in the first slot; and / or, along the second direction, a second slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the fourth connection portion is accommodated in the second slot. By providing the first slot on the side of the third insulating member away from the electrode assembly along the second direction, the third connection portion of the first current collecting member can be accommodated in the first slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing the second slot on the side of the third insulating member away from the electrode assembly along the second direction, the fourth connection portion of the second current collecting member can be accommodated in the second slot, thereby improving the structural stability of the third insulating assembly between the fourth connection portion and the plurality of electrode assemblies, and the third insulating member and the fourth connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0045] 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 to connect the third connection portion of the first current collecting member with the first electrode terminal, and to connect the fourth connection portion of the second current collecting member with the second electrode terminal, and on the other hand, it is possible to keep the third connection portion of the first current collecting member and the fourth connection portion of the second current collecting member away from each other, which is beneficial to reducing the risk of short circuit between the third connection portion and the fourth connection portion, so as to improve the reliability of the battery cell. In addition, in a battery cell adopting such a 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 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 lug, and to separate the area where the second current collecting member is connected to the second electrode terminal and the area where the second current collecting member is connected to the second pole lug, which is beneficial to reducing the difficulty of assembling the first current collecting member with the first electrode terminal and the first pole lug, and reducing the difficulty of assembling the second current collecting member with the second electrode terminal and the second pole lug, and can reduce the interference problem between the first electrode terminal and the first pole lug and between the second electrode terminal and the second pole lug. In particular, when the first electrode terminal and the first electrode tab are both welded to the first current collecting member, and the second electrode terminal and the second electrode tab are both welded to the second current collecting member, the mutual influence between the welding molten pool of the first electrode terminal and the first current collecting member and the welding molten pool of the first electrode tab and the first current collecting member can be effectively reduced, and the mutual influence between the welding molten pool of the second electrode terminal and the second current collecting member and the welding molten pool of the second electrode tab and the second current collecting member can be reduced, which is beneficial to improving the assembly quality and stability of the first electrode terminal and the first electrode tab connected to the first current collecting member, and the second electrode terminal and the second electrode tab connected to the second current collecting member.

[0046] In some embodiments, the battery cell includes a third insulating member and a fourth insulating member; the third insulating member is disposed between the third connection portion and the plurality of electrode assemblies along the second direction to insulate and isolate the third connection portion and the electrode assembly; the fourth insulating member is disposed between the fourth connection portion and the plurality of electrode assemblies along the second direction to insulate and isolate the fourth connection portion and the electrode assembly. In this way, insulation isolation between the third connection portion and the electrode assembly and between the fourth connection portion and the electrode assembly can be achieved, thereby facilitating the reduction of the short circuit risk of the battery cell and improving the reliability of the battery cell.

[0047] In some embodiments, along the second direction, a first card slot is provided on the side of the third insulating member away from the plurality of electrode assemblies, and the third connection 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 away from the plurality of electrode assemblies, and the fourth connection portion is accommodated in the second card slot. By providing the first card slot on the side of the third insulating member away from the electrode assembly along the second direction, the third connection portion of the first current collecting member can be accommodated in the first card slot, thereby improving the structural stability of the third insulating assembly between the third connection portion and the plurality of electrode assemblies, and the third insulating member and the third connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell. Similarly, by providing the second card slot on the side of the fourth insulating member away from the electrode assembly along the second direction, the fourth connection portion of the second current collecting member can be accommodated in the second card slot, thereby improving the structural stability of the fourth insulating assembly between the fourth connection portion and the plurality of electrode assemblies, and the fourth insulating member and the fourth connection portion can share space in the second direction, which is beneficial to improving the internal space utilization rate of the battery cell.

[0048] In some embodiments, the battery cell includes a plurality of electrode assemblies, the housing has a storage space, and the plurality of electrode assemblies are stored in the storage space; the battery cell includes a separator, the separator is disposed in the storage space, and the separator is configured to separate the storage space into a plurality of subspaces, each of which contains at least one electrode assembly. A separator is disposed in the storage space of the housing, and the separator separates the storage space into a plurality of subspaces. The separator separates the electrode assemblies in each subspace, so as to reduce the risk of expansion stress accumulation of the electrode assemblies in adjacent subspaces, which may cause mutual compression and deformation of the electrode assemblies, and effectively improve the reliability of the battery cell.

[0049] In some embodiments, the partition device includes a partition wall, the partition wall is configured to separate two adjacent subspaces, and a receiving cavity is formed inside the partition wall; the battery cell includes a thermal management component, and the thermal management component is received in the receiving cavity. The receiving cavity is formed inside the partition wall, and the thermal management component is arranged in the receiving cavity of the partition wall, so that the space inside the partition wall is fully utilized, and the space inside the housing occupied by the thermal management component is reduced while achieving temperature management of the electrode assembly, so that more space is freed up for the electrode assembly, which is conducive to improving the volume energy density of the battery cell.

[0050] 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 communicated with the accommodating cavity. The outer surface of the housing is provided with an opening communicated with the accommodating cavity, and the heat management component can enter the accommodating cavity from the outside of the housing through the opening. When installing or removing the heat management component, there is no need to open the housing, and the operation is more convenient.

[0051] In some embodiments, the partition device includes at least one partition wall, which is disposed in the accommodation space and connected to the housing, and the partition wall is configured to separate two adjacent subspaces. The accommodation space inside the housing is divided into a plurality of subspaces by at least one partition wall, and the structure is simple, and each partition wall can separate the electrode assemblies in two adjacent subspaces. Since the partition wall is connected to the housing, the expansion force generated by the expansion of the electrode assembly in the subspace can be transmitted to the housing through 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.

[0052] In some embodiments, the plurality of electrode assemblies are arranged along the second direction, the partition device includes a plurality of partition walls, and the plurality of partition walls are arranged at intervals in the accommodation space along the second direction. The plurality of partition walls arranged at intervals can separate the accommodation space into more subspaces, so that the electrode assemblies in more subspaces are separated by the partition walls, and the expansion force generated by all the electrode assemblies can be transmitted to the housing through more partition walls, further reducing the risk of extrusion deformation of the electrode assemblies.

[0053] 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.

[0054] In some embodiments, the partition device includes a plurality of receiving units disposed in the receiving space, and a subspace is formed inside each receiving unit. In this way, the plurality of receiving units can each receive the electrode assembly, and the receiving unit can bear the expansion force of the electrode assembly in the subspace in multiple directions. In addition, after the electrode assembly is received in the receiving unit, the receiving unit can restrict the electrode assembly, thereby reducing the risk of the electrode assembly tilting or shaking inside the housing.

[0055] In some embodiments, two adjacent receiving units share a partition wall, and the partition wall is configured to separate the subspaces of the two adjacent receiving units. In this way, when the volume of the receiving space is constant, the volume of the subspace can be increased to free up more space for the electrode assembly, which is conducive to improving the volume energy density of the battery cell. In addition, two adjacent receiving units share a partition wall, so that multiple receiving units can be used as a whole, and it is easier to install the partition device in the shell.

[0056] 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.

[0057] 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.

[0058] In a fourth aspect, an embodiment of the present application provides an energy storage device, comprising a battery cell provided by any one embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0061] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0062] Figure 3 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at the same end of a main body) provided in some embodiments of the present application;

[0063] Figure 4 for Figure 3 An assembly diagram of a battery cell is shown;

[0064] Figure 5 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at the same end of a main body) provided in some other embodiments of the present application;

[0065] Figure 6 for Figure 5 A schematic diagram of the structure of the electrode assembly shown;

[0066] Figure 7 for Figure 5 An assembly diagram of the electrode assembly, the first current collecting member, and the second current collecting member shown;

[0067] Figure 8 A schematic structural diagram of a first current collecting component provided in some embodiments of the present application;

[0068] Fig. 9 A schematic structural diagram of a first current collecting component provided in some other embodiments of the present application;

[0069] Fig.10 A schematic structural diagram of a second current collecting component provided in some embodiments of the present application;

[0070] Fig.11 A schematic structural diagram of a second current collecting component provided in some other embodiments of the present application;

[0071] Fig.12 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at the same end of a main body) provided in some other embodiments of the present application;

[0072] Fig.13 for Fig.12 An assembly diagram of a battery cell is shown;

[0073] Fig.14 for Fig.12 An assembly diagram of the electrode assembly, the first current collecting member, and the second current collecting member shown;

[0074] Fig.15 for Fig.12 A schematic structural diagram of a first current collecting component is shown;

[0075] Fig.16 for Fig.12 A schematic structural diagram of a second current collecting component is shown;

[0076] Fig.17 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at the same end of a main body) provided in some other embodiments of the present application;

[0077] Fig.18 for Fig.17 An assembly diagram of a battery cell is shown;

[0078] Fig.19 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at opposite ends of a main body) provided in some embodiments of the present application;

[0079] Fig. 20 for Fig.19 An assembly diagram of a battery cell is shown;

[0080] Fig.21 for Fig.19 A schematic diagram of the connection between the electrode assembly, the first current collecting member and the second current collecting member shown;

[0081] Fig. 22 for Fig.19 A schematic structural diagram of a first current collecting component is shown;

[0082] Fig.23 for Fig.19 A schematic structural diagram of a second current collecting component is shown;

[0083] Fig.24 An exploded view of a battery cell (a first pole tab and a second pole tab are disposed at opposite ends of a main body) provided in some other embodiments of the present application;

[0084] Fig.25 An exploded view of a battery cell (with a separator disposed in the housing) provided in some embodiments of the present application;

[0085] Fig.26 for Fig.25 A schematic diagram of the connection between the housing and the partition device shown;

[0086] Fig. 27 for Fig.26 A cross-sectional view of the housing shown along the XY section;

[0087] Fig.28 for Fig.25 A schematic diagram of the structure of the housing shown;

[0088] Fig.29 An exploded view of a battery cell (with a separator disposed in the housing) provided in some other embodiments of the present application;

[0089] Fig.30 for Fig.29 A schematic structural diagram of the partition device shown;

[0090] Fig.31 A schematic diagram of the structure of a housing provided for some embodiments of the present application.

[0091] Icons: 1-housing; 11-shell; 12-end cover; 13-first wall; 14-second wall; 15-third wall; 16-mouth; 2-electrode assembly; 21-first pole ear; 22-second pole ear; 23-main body; 3-first electrode terminal; 4-second electrode terminal; 5-first current collecting member; 51-first avoidance area; 52-first connecting part; 53-first convex part; 54-third connecting part; 6-second current collecting member; 61-second avoidance area; 62-second connecting part; 63-second convex part; 64-fourth connecting part 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

[0092] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0093] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0094] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0095] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0096] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0097] The term "plurality" used in the present application refers to two or more (including two).

[0098] 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.

[0099] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0100] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0101] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0102] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0103] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0104] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other 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 alone or in combination of two or more.

[0105] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0106] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0107] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0108] 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.

[0109] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0110] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0111] 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.

[0112] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0113] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0114] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0115] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0116] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0117] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0118] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0119] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0120] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0121] 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.

[0122] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0123] 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.

[0124] In some embodiments, the electrode assembly is a laminate structure.

[0125] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0126] 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.

[0127] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0128] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0129] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0130] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0131] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0132] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0133] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0134] 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.

[0135] 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.

[0136] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0137] 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.

[0138] A battery usually includes multiple battery cells, which are usually connected in series, in parallel, or in a mixed connection. At present, the volume and capacity of battery cells are relatively small. If the large capacity requirements of the battery are to be met, more battery cells need to be installed in the battery. As the number of battery cells increases, the number of parts connecting multiple battery cells increases, the battery management system and wire materials are used in large quantities, and the cost of the battery is high. In order to reduce costs, the capacity of the battery cells can be increased, thereby reducing the number of battery cells in the battery.

[0139] For general large-capacity battery cells, the volume of the battery cell shell and the capacity of the battery cell are not reasonably designed, and it is difficult to take into account the economy and energy density requirements of the battery cell.

[0140] In view of this, the present application embodiment 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. In this way, 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. The battery cell will not be too large in size and too small in capacity, thereby increasing the volume energy density of large-capacity battery cells, thus taking into account both the economy and energy density requirements of the battery cell.

[0141] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0142] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0143] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0144] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0145] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0146] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0147] Please refer to Figure 2 , Figure 2 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 case 20 , wherein the battery cell 10 is accommodated in the case 20 .

[0148] Among them, the box body 20 is a component for accommodating the battery cell 10. The box body 20 provides a storage space for the battery cell 10. The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other to define a storage space for accommodating the battery cell 10. The first part 201 and the second part 202 may be in a variety of shapes, such as a cuboid, a cylinder, etc. The first part 201 may be a hollow structure with one side open, and the second part 202 may also be a hollow structure with one side open, and the open side of the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. It is also possible that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure, and the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. The first part 201 and the second part 202 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0149] In the battery 100, there may be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 10 are both connected in series and in parallel. The battery modules may be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. Alternatively, all the battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 10 may be accommodated in the box 20.

[0150] Please refer to Figure 3 , Figure 3 The exploded view of the battery cell 10 (the first pole tab 21 and the second pole tab 22 are arranged at the same end of the 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 accommodated in the housing 1.

[0151] 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 .

[0152] The shell 11 is a component for accommodating the electrode assembly 2. The shell 11 may be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The shell 11 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 11 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0153] The end cap 12 is a component that closes the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the shell 11 together define a storage space for accommodating the electrode assembly 2, electrolyte, etc. The end cap 12 can be connected to the shell 11 by welding or crimping to close the opening of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0154] In the embodiment where an opening is formed at one end of the housing 11, one end cap 12 may be provided accordingly. In the embodiment where openings are formed at both ends of the housing 11, two end caps 12 may be provided accordingly, and the two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space.

[0155] The electrode assembly 2 may be a laminate structure or a winding structure.

[0156] In some embodiments, the battery cell 10 may further include an electrode terminal, which is disposed on the housing 1 and is used to electrically connect to the tab of the electrode assembly 2 to output the electrical energy of the battery cell 10. The electrode terminal may be disposed on the shell 11 of the housing 1 or on the end cover 12 of the housing 1. The electrode terminal and the tab may be directly connected, for example, the electrode terminal and the tab are welded. The electrode terminal and the tab may also be indirectly connected, for example, the electrode terminal and the tab are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0157] As an example, Figure 3As shown, along the first direction X, an opening is formed at one end of the shell 11, and there is one end cap 12 in the shell 1, and one end cap 12 closes one opening of the shell 11. There are multiple electrode assemblies 2, and the multiple electrode assemblies 2 are arranged along the second direction Y. The end cap 12 is provided with a first electrode terminal 3 and a second electrode terminal 4, and the first electrode terminal 3 and the second electrode terminal 4 are arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Along the first direction X, a first pole tab 21 and a second pole tab 22 are formed at one end of the electrode assembly 2 facing the end cap 12, and the polarities of the first pole tab 21 and the second pole tab 22 are opposite, and the first pole tab 21 is connected to the first electrode terminal 3 through the first current collecting member 5 to realize the electrical connection between the first pole tab 21 and the first electrode terminal 3, and the second pole tab 22 is connected to the second electrode terminal 4 through the second current collecting member 6 to realize the electrical connection between the second pole tab 22 and the second electrode terminal 4.

[0158] The present application embodiment provides a battery cell 10, please continue to refer to 3 and Figure 4 , Figure 4 for Figure 3 The assembly diagram of the battery cell 10 shown in the figure includes a housing 1 and an electrode assembly 2, wherein the electrode assembly 2 is contained in the housing 1, the volume of the housing 1 is V, and the capacity of the battery cell 10 is C, which satisfies: 1.4dm 3 ≤V≤65dm 3 , 400Ah≤C≤5000Ah.

[0159] The shell 1 may be cylindrical, prism-shaped, etc. Among them, prisms include triangular prisms, quadrangular prisms, pentagonal prisms, hexagonal prisms, etc. Quadrangular prisms include cuboids, cubes, etc. The electrode assembly 2 in the shell 1 may be one or more. If there are multiple electrode assemblies 2 in the shell 1, the multiple electrode assemblies 2 may be distributed in an array, and the multiple electrode assemblies 2 may be arranged in one row or in multiple rows, and there are multiple electrode assemblies 2 in each row of electrode assemblies 2.

[0160] The volume of the shell 1 of the battery cell 10 can be measured in a variety of ways. For a shell 1 of a regular shape, taking the shell 1 in a rectangular shape as an example, the length L, width W and height H of the shell 1 can be measured by a measuring tool, and the volume of the shell 1 can be calculated by measuring the length L, width W and height H of the shell 1. It can be understood that V = L × W × H. For a shell 1 in a rectangular shape, the shell 1 includes six walls. If the outer surfaces of the six walls of the shell 1 are all planes, the length, width and height of the shell 1 are measured based on the outer surfaces of each wall; if the outer surface of one or more walls of the shell 1 is formed with a convex portion or a concave portion, the length L, width W and height H of the shell 1 are measured based on the plane area of ​​the outer surface (the area outside the convex portion or the concave portion). For the shell 1 in a cylindrical shape as an example, the length (axial dimension of the shell 1) L and the diameter D of the shell 1 can be measured by a measuring tool, and the volume of the shell 1 can be calculated by measuring the length L and the diameter D of the shell 1. It can be understood that V = πD 2 ×L / 4. The measuring tool can be a vernier caliper. As an example, Figure 3 In the embodiment, 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 .

[0161] For an irregularly shaped housing 1, the volume of the housing 1 can be measured by the immersion method. The specific method is as follows: inject liquid into the measuring container and record the volume value X corresponding to the liquid level. 1 , taking the first electrode terminal 3 and the second electrode terminal 4 of the battery cell 10 as an example, with the first electrode terminal 3 and the second electrode terminal 4 facing upward, the battery cell 10 is gradually immersed in the liquid until the upper surface of the battery cell 10 is flush with the liquid surface. At this time, the first electrode terminal 3 and the second electrode terminal 4 are not immersed in the liquid, and the volume value X corresponding to the liquid surface at this time is recorded. 2 , V = X 2 -X 1 .

[0162] The unit of V is dm 3 (cubic decimeter), V can be 1.4dm 3 , 2dm 3 、5dm 3 、8dm 3 、10dm 3 、12dm 3 、15dm 3 、18dm 3 、20dm 3 , 22dm 3 、25dm 3 、28dm3 、30dm 3 、32dm 3 、35dm 3 、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 between the two.

[0163] 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.

[0164] 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.

[0165] In some embodiments, the positive electrode material of the battery cell 10 includes a lithium-containing phosphate, 400Ah≤C≤5000Ah, 2.5dm 3 ≤V≤46dm 3 .

[0166] 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 between the two.

[0167] Lithium-containing phosphates include but are not limited to: lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), at least one of a composite material of lithium manganese phosphate and carbon, a composite material of lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0168] For a battery cell 10 whose positive electrode material includes a 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 .

[0169] In some embodiments, 400Ah≤C≤1500Ah, 2.5dm 3 ≤V≤13.8dm 3 .

[0170] 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 between the two.

[0171] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range value between any two of them.

[0172] 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.

[0173] In some embodiments, 1500Ah<C≤3000Ah, 9.6dm 3 ≤V≤27.6dm 3 .

[0174] 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 between the two.

[0175] 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.

[0176] 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.

[0177] In some embodiments, 3000Ah<C≤5000Ah, 19.3dm 3 ≤V≤46dm 3 .

[0178] 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 between the two.

[0179] 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 value between any two of them.

[0180] 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.

[0181] In some embodiments, the positive electrode material of the battery cell 10 includes a lithium transition metal oxide, 400Ah≤C≤5000Ah, 1.4dm 3 ≤V≤40.6dm 3 .

[0182] 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 between the two.

[0183] Lithium transition metal oxides include but are not limited to lithium cobalt oxides (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0184] For a battery cell 10 whose positive electrode material includes a 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 .

[0185] In some embodiments, 400Ah≤C≤1500Ah, 1.4dm 3 ≤V≤12.2dm 3 .

[0186] 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 between the two.

[0187] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range value between any two of them.

[0188] 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.

[0189] In some embodiments, 1500Ah<C≤3000Ah, 6.2dm 3 ≤V≤24.4dm 3 .

[0190] 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 between the two.

[0191] 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.

[0192] 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.

[0193] In some embodiments, 3000Ah<C≤5000Ah, 12.4dm 3 ≤V≤40.6dm 3 .

[0194] 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 between the two.

[0195] 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 value between any two of them.

[0196] 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.

[0197] In some embodiments, the battery cell 10 is a sodium battery, 400Ah≤C≤5000Ah, 3.5dm 3 ≤V≤65dm 3 .

[0198] The sodium battery can be a sodium ion battery, a sodium lithium ion battery, a sodium metal battery, etc.

[0199] 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 between the two.

[0200] For sodium batteries, the volume of the housing 1 is controlled to 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 .

[0201] In some embodiments, 400Ah≤C≤1500Ah, 3.5dm 3 ≤V≤19.4dm 3 .

[0202] 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 between the two.

[0203] C can be any point value among 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range value between any two of them.

[0204] 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, 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.

[0205] In some embodiments, 1500Ah<C≤3000Ah, 13.8dm 3 ≤V≤38.7dm 3 .

[0206] 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 between the two.

[0207] 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.

[0208] 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, 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.

[0209] In some embodiments, 3000Ah<C≤5000Ah, 27.6dm 3 ≤V≤65dm 3 .

[0210] 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 between the two.

[0211] 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 value between any two of them.

[0212] 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, 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.

[0213] In some embodiments, the housing 1 is in a rectangular parallelepiped shape, the length of the housing 1 is L, the width of the housing 1 is W, and the height of the housing 1 is H, satisfying: 1.2dm≤L≤15dm, 0.2dm≤W≤20dm, 0.6≤H≤5dm. The unit of L, W, and H is dm (decimeter).

[0214] 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 value between any two of them.

[0215] 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 value between any two of them.

[0216] 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 value between any two of them.

[0217] In some embodiments, the volume of the electrode assembly 2 is V 1 The number of electrode assemblies 2 contained in the housing 1 is N, satisfying: 0.2dm 3 ≤V 1 ≤7.8dm 3 , N≥5.

[0218] The electrode assembly 2 may be cylindrical or flat. If the electrode assembly is cylindrical, the length of the electrode assembly (the axial dimension of the electrode assembly) L can be measured by a measuring tool. 1 and diameter D 1 , according to V 1 =πD 1 2 ×L 1 / 4 Calculate the volume of the electrode assembly. If the electrode assembly is flat and has a laminated structure, the length L of the electrode assembly can be measured using a measuring tool. 1 , Width W 1 and thickness H 1 , according to V 1 =L 1 ×W 1 ×H 1 Calculate the volume of the electrode assembly. If the electrode assembly is flat and has a winding structure, the electrode assembly includes a straight area and bending areas at both ends of the straight area, the two bending areas are arranged along the width direction of the electrode assembly, and 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 V of the electrode assembly. 1 , the length L of the electrode assembly can be measured by measuring tools 1 , Width W 1 and thickness H 1 , the volume of the bending zone V 2 =πH 1 2 ×L 1 / 8, the volume of the flat area V 3 =L 1 ×(W 1 -H 1 )×H 1 , V 1 =2V 2 +V 3 .

[0219] V 1 You 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 、6.5dm3 、6.8dm 3 、7dm 3 , 7.2dm 3 、7.5dm 3 、7.8dm 3 Any point value or any range between the two.

[0220] N can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or more.

[0221] In this embodiment, the N electrode assemblies 2 in the housing 1 may be distributed in an array, and the plurality of electrode assemblies 2 may be arranged in a row or in multiple rows, with multiple electrode assemblies 2 in each row of electrode assemblies 2. Figure 3 In the embodiment, N electrode assemblies 2 are arranged in a row, and N electrode assemblies 2 are arranged along the second direction Y. The electrode assembly 2 is flat, and the second direction Y is parallel to the thickness direction of the electrode assembly 2. The flat electrode assembly 2 can be a laminate structure or a winding structure. The thickness of the flat electrode assembly 2 can be less than the width of the electrode assembly 2 and the length of the electrode assembly 2, and the first pole ear 21 and the second pole ear 22 can be located in the width direction of the electrode assembly 2. If the electrode assembly 2 is a laminate structure, the stacking direction of the pole pieces in the electrode assembly 2 is parallel to the thickness direction of the electrode assembly 2; if the electrode assembly 2 is a winding structure, the stacking direction of the pole pieces in the straight area is parallel to the thickness direction of the electrode assembly 2.

[0222] In this embodiment, the volume of the electrode assembly 2 is controlled to 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. That is, 0.2dm 3 ≤V 1 ≤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.

[0223] In some embodiments, please refer to Figure 5-Figure 7 , Figure 5 A schematic diagram of the structure of a battery cell 10 (a first pole tab 21 and a second pole tab 22 are disposed at the same end of a main body 23) provided in some other embodiments of the present application; Figure 6 for Figure 5 The schematic structural diagram of the electrode assembly 2 shown; Figure 7 for Figure 5The assembly diagram of the electrode assembly 2, the first current collecting member 5, and the second current collecting member 6 is shown. The electrode assembly 2 includes a main body 23, a first pole tab 21 and a second pole tab 22, the first pole tab 21 and the second pole tab 22 have opposite polarities, and the first pole tab 21 and the second pole tab 22 are arranged 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 the first direction X, the first pole tabs 21 of the plurality of electrode assemblies 2 are located at the same end of the main body 23, and the second pole 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 pole tabs 21 of the plurality of electrode assemblies 2, and the second current collecting member 6 connects the second pole tabs 22 of the plurality of electrode assemblies 2.

[0224] One of the first pole tab 21 and the second pole tab 22 is a positive pole tab, and the other is a negative pole tab. The main body 23 may be a portion of the electrode assembly 2 corresponding to the region where the pole sheet is coated with the active material layer, the positive pole tab may be a portion of the positive pole sheet not coated with the positive active material layer, and the negative pole tab may be a portion of the negative pole sheet not coated with the negative active material layer. The first pole tab 21 and the second pole tab 22 may be arranged at the same end of the main body 23 along the first direction X, and the first current collecting member 5 and the second current collecting member 6 may be respectively arranged on the same side of the main body 23 along the first direction X; the first pole tab 21 and the second pole tab 22 may also be respectively arranged at the two opposite ends of the main body 23 along the first direction X, and the first current collecting member 5 and the second current collecting member 6 may also be respectively arranged on the two opposite sides of the main body 23 along the first direction X. Taking the case 1 as a rectangular parallelepiped as an example, any one of the length direction of the shell 1, the width direction of the shell 1, and the height direction of the shell 1 may be parallel to the first direction X.

[0225] The first current collecting member 5 may be partially located in the housing 1 and partially located outside the housing 1, or the first current collecting member 5 may be entirely located in the housing 1 or the first current collecting member 5 may be entirely located outside the housing 1. The second current collecting member 6 may be partially located in the housing 1 and partially located outside the housing 1, or the second current collecting member 6 may be entirely located in the housing 1 or the second current collecting member 6 may be entirely located outside the housing 1. The first current collecting member 5 and the second current collecting member 6 are both conductors, and the materials of the first current collecting member 5 and the second current collecting member 6 may be the same or different. The material of the first current collecting member 5 may be copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the second current collecting member 6 may be copper, iron, aluminum, steel, aluminum alloy, etc. The first current collecting member 5 and the second current collecting member 6 may 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, and 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 in various ways to achieve electrical connection between the first electrode tab 21 and the first current collecting member 5, such as welding connection, conductive adhesive bonding, etc. The second electrode tab 22 and the second current collecting member 6 can be connected in various ways to achieve electrical connection between the second electrode tab 22 and the second current collecting member 6, such as welding connection, conductive adhesive bonding, etc.

[0226] In this embodiment, the first pole ears 21 of the plurality of electrode assemblies 2 are connected by the first current collecting component 5, so that the first pole ears 21 of the plurality of electrode assemblies 2 are converged, and the second pole ears 22 of the plurality of electrode assemblies 2 are connected by the second current collecting component 6, so that the second pole ears 22 of the plurality of electrode assemblies 2 are converged. There is no need to increase the volume of a single electrode assembly 2, and the manufacturing difficulty of a large-capacity battery cell 10 can be reduced.

[0227] In some embodiments, please refer to Figure 7 Along the first direction X, at least part of the first current collecting member 5 is located on the side of the main body 23 where the first pole tab 21 is provided, and part of the first pole tab 21 is located on the side of the first current collecting member 5 away from the main body 23 and connected to the first current collecting member 5 .

[0228] It can be 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.

[0229] Along the first direction X, part 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 connected to the first current collecting member 5, so that the first electrode tab 21 is connected to the side of the first current collecting member 5 away from the main body 23. The first electrode tab 21 may be connected to the side of the first current collecting member 5 away from the main body 23 after bypassing the edge of the first current collecting member 5 from the side facing the main body 23 of the first current collecting member 5, or the first current collecting member 5 may be provided with a channel for the first electrode tab 21 to pass through, so that the first electrode tab 21 passes through the first current collecting member 5 and then is connected to the side of the first current collecting member 5 away from the main body 23.

[0230] In the present 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 pole tab 21 is disposed, so as to facilitate the connection between the first current collecting member 5 and the first pole tab 21, it is helpful to reduce the difficulty of assembling the first current collecting member 5 and the first pole tab 21. In addition, by disposing a portion of the first pole tab 21 on the side of the first current collecting member 5 away from the main body 23 in the first direction X, and the portion is connected to the first current collecting member 5, so that the first pole tab 21 is a structure that bypasses the first current collecting member 5 and is connected to the side of the first current collecting member 5 away from the main body 23, on the one hand, it can reduce the difficulty of connecting the first pole tab 21 with the first current collecting member 5, and on the other hand, it can reduce the phenomenon that the first current collecting member 5 presses the first pole tab 21 in the direction close to the main body 23, so as to reduce the risk of short circuit caused by the first pole tab 21 being inserted into the main body 23.

[0231] In some embodiments, please refer to Figure 7 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. The first electrode tab 21 passes through the first avoidance area 51 and is connected to a side of the first current collecting member 5 away from the main body 23 .

[0232] 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.

[0233] It is possible that only one first avoidance area 51 is provided on the first current collecting component 5, and the first pole ears 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 away from the main body 23. It is also possible that the first current collecting component 5 is provided with a first avoidance area 51 corresponding to the first pole ear 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 ear 21 of one electrode assembly 2 or the first pole ears 21 of multiple electrode assemblies 2 to pass through.

[0234] As an example, Figure 7As shown, the plurality of electrode assemblies 2 are arranged along the second direction Y, the first current collecting member 5 and the second current collecting member 6 are arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. A row of first avoidance areas 51 is provided on the first current collecting member 5 corresponding to the first pole tabs 21 of the plurality of electrode assemblies 2, and each row of the first avoidance areas 51 includes a plurality of first avoidance areas 51 arranged at intervals along the second direction Y, and the first pole tabs 21 of two adjacent electrode assemblies 2 in the plurality of electrode assemblies 2 pass through the first current collecting member 5 through one first avoidance area 51 and are connected to the side of the first current collecting member 5 away from the main body 23.

[0235] 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.

[0236] In the present 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 lug 21 can pass through the first avoidance area 51 and then be connected to the side of the first current collecting member 5 away from the main body 23. The battery cell 10 adopting this structure facilitates the first pole lug 21 to be provided as a structure connected to the side of the first current collecting member 5 away from the main body 23, which can reduce the difficulty of the first pole lug 21 bypassing the first current collecting member 5, and can optimize the length of the first pole lug 21 bypassing the first current collecting member 5, thereby alleviating the phenomenon of redundancy of the first pole lug 21 and reducing the manufacturing cost of the battery cell 10.

[0237] In some embodiments, please refer to Figure 8 , Figure 8 This is a schematic structural diagram of the 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 .

[0238] The through hole penetrates the first current collecting member 5 along the first direction X, and the through hole may be a circular hole, a polygonal hole, etc. As an example, Figure 8 In the embodiment, the through hole is a rectangular hole, there are multiple rectangular holes, and the multiple rectangular holes on the first current collecting member 5 are arranged along the second direction Y.

[0239] 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, which has a simple structure and is easy to manufacture.

[0240] In other embodiments, please refer to Fig. 9 , Fig. 9The first avoidance area 51 is a notch provided at the edge of the first current collecting member 5 .

[0241] The notch penetrates the first current collecting member 5 along the first direction X, and the notch extends to the edge of the first current collecting member 5 along the third direction Z. Fig. 9 There are multiple notches, and the multiple notches on the first current collecting member 5 are arranged along the second direction Y. Along the second direction Y, the notches located at both ends extend to the edges of the first current collecting member 5 respectively.

[0242] In this embodiment, the first avoidance area 51 is a notch arranged at the edge of 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 some embodiments, please refer to Figure 5 , the first current collecting component 5 is arranged in the housing 1.

[0244] 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 .

[0245] In this embodiment, by disposing the first current collecting member 5 inside the shell 1, it is helpful to reduce the difficulty of assembling the first electrode ear 21 and the first current collecting member 5, so as to improve 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, so as to reduce the wear or damage of the first current collecting member 5 during use.

[0246] In other embodiments, the first current collecting component 5 may also be disposed on the outside of the outer shell 1 . Along the first direction X, the outer 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 outer shell 1 through the corresponding first channel and is connected to the first current collecting component 5 .

[0247] Among them, along the first direction X, a first channel for each first pole ear 21 to extend out is provided on one side of the shell 1 close to the first pole ear 21, that is, the area of ​​the shell 1 facing the side of the main body 23 provided with the first pole ear 21 in the first direction X is provided with a first channel for the first pole ear 21 to pass through, so that the first pole ears 21 of the multiple electrode assemblies 2 can extend out of the shell 1 and then be connected to the first current collecting member 5 located outside the shell 1.

[0248] As an example, the housing 1 may be provided with a plurality of first holes, and the first holes correspond to the first pole tabs 21 one by one, so that the first pole tab 21 of each electrode assembly 2 can extend out of the housing 1 through a first hole, which is conducive to reducing the interference between the first pole tabs 21 of the plurality of electrode assemblies 2. Of course, in other embodiments, only one first hole may be provided on the housing 1, and the first pole tabs 21 of the plurality of electrode assemblies 2 extend out of the housing 1 through the same first hole.

[0249] In the present embodiment, by arranging the first current collecting member 5 on the outside of the outer shell 1, and providing a first hole for the first pole ear 21 to pass through on the outer shell 1, the battery cell 10 adopting such a structure can, on the one hand, reduce the internal space of the outer 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 improve 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 reduce the maintenance cost of the battery cell 10.

[0250] In some embodiments, please refer to Figure 7 Along the first direction X, at least part of the second current collecting member 6 is located on the side of the main body 23 where the second pole tab 22 is provided, and part of the second pole tab 22 is located on the side of the second current collecting member 6 away from the main body 23 and connected to the second current collecting member 6.

[0251] It is understandable that 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 along the first direction X. 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 provided, 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 provided.

[0252] Along the first direction X, part of the second pole tab 22 is located on the side of the second current collecting member 6 away from the main body 23 and connected to the second current collecting member 6, so that the second pole tab 22 is connected to the side of the second current collecting member 6 away from the main body 23. The second pole tab 22 may be connected to the side of the second current collecting member 6 away from the main body 23 after bypassing the edge of the second current collecting member 6 from the side of the second current collecting member 6 facing the main body 23, or the second current collecting member 6 may be provided with a channel for the second pole tab 22 to pass through, so that the second pole tab 22 passes through the second current collecting member 6 and then is connected to the side of the second current collecting member 6 away from the main body 23.

[0253] In the present 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 pole tab 22 is disposed, so as to facilitate the connection between the second current collecting member 6 and the second pole tab 22, it is helpful to reduce the difficulty of assembling the second current collecting member 6 and the second pole tab 22. In addition, by disposing a portion of the second pole tab 22 on the side of the second current collecting member 6 away from the main body 23 in the first direction X, and the portion is connected to the second current collecting member 6, so that the second pole tab 22 is a structure that bypasses the second current collecting member 6 and is connected to the side of the second current collecting member 6 away from the main body 23, on the one hand, it can reduce the difficulty of connecting the second pole tab 22 with the second current collecting member 6, and on the other hand, it can reduce the phenomenon that the second current collecting member 6 presses the second pole tab 22 in the direction close to the main body 23, so as to reduce the risk of short circuit caused by the second pole tab 22 being inserted into the main body 23.

[0254] In some embodiments, please refer to Figure 7 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. The second electrode tab 22 passes through the second avoidance area 61 and is connected to a side of the second current collecting member 6 away from the main body 23 .

[0255] It is possible that only one second avoidance area 61 is provided on the second current collecting component 6, and the second pole ears 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 away from the main body 23. It is also possible that the second current collecting component 6 is provided with a second avoidance area 61 corresponding to the second pole ear 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 ear 22 of one electrode assembly 2 or the second pole ears 22 of multiple electrode assemblies 2 to pass through.

[0256] As an example, Figure 7 As shown, a row of second avoidance areas 61 is provided on the second current collecting component 6 corresponding to the second pole ears 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, and the second pole ears 22 of two adjacent electrode assemblies 2 among the plurality of electrode assemblies 2 pass through the second current collecting component 6 through a second avoidance area 61 and are connected to the side of the second current collecting component 6 away from the main body 23.

[0257] In the present 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 lug 22 can pass through the second avoidance area 61 and then 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 lug 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 lug 22 bypassing the second current collecting member 6, and can optimize the length of the second pole lug 22 bypassing the second current collecting member 6, thereby alleviating the phenomenon of redundancy of the second pole lug 22 and reducing the manufacturing cost of the battery cell 10.

[0258] In some embodiments, please refer to Fig.10 , Fig.10 The second avoidance area 61 is a through hole provided on the second current collecting member 6 .

[0259] The through hole penetrates the second current collecting member 6 along the first direction X, and the through hole may be a circular hole, a polygonal hole, etc. As an example, Fig. 9 In the embodiment, the through hole is a rectangular hole, there are multiple rectangular holes, and the multiple rectangular holes on the second current collecting member 6 are arranged along the second direction Y.

[0260] 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.

[0261] In other embodiments, please refer to Fig.11 , Fig.11 The second avoidance area 61 is a notch provided at the edge of the second current collecting member 6 .

[0262] The notch penetrates the second current collecting member 6 along the first direction X, and the notch extends to the edge of the second current collecting member 6 along the third direction Z. Fig.11 There are multiple notches, and the multiple notches on the second current collecting member 6 are arranged along the second direction Y. Along the second direction Y, the notches located at both ends extend to the edges of the second current collecting member 6 respectively.

[0263] In this embodiment, the second avoidance area 61 is a notch arranged 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.

[0264] In some embodiments, please refer to Figure 5, the second current collecting component 6 is arranged in the housing 1.

[0265] 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 .

[0266] In this embodiment, by arranging the second current collecting member 6 inside the outer shell 1, it is helpful to reduce the difficulty of assembling the second pole ear 22 and the second current collecting member 6, so as to improve the production efficiency of the battery cell 10, and the outer shell 1 can play a certain protective role on the second current collecting member 6, so as to reduce the wear or damage of the second current collecting member 6 during use.

[0267] In other embodiments, the second current collecting component 6 is disposed 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 .

[0268] Among them, along the first direction X, a side of the shell 1 close to the second pole ear 22 is provided with a second channel for each second pole ear 22 to extend out, that is, the area of ​​the shell 1 facing the side of the main body 23 provided with the second pole ear 22 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 plurality of electrode assemblies 2 can extend out of the shell 1 and then be interconnected with the second current collecting member 6 located outside the shell 1.

[0269] As an example, the housing 1 may be provided with a plurality of second holes, and the second holes correspond to the second pole tabs 22 one by one, so that the second pole tab 22 of each electrode assembly 2 can extend out of the housing 1 through a second hole, which is helpful to reduce the interference between the second pole tabs 22 of the plurality of electrode assemblies 2. Of course, in other embodiments, the housing 1 may be provided with only one second hole, and the second pole tabs 22 of the plurality of electrode assemblies 2 may extend out of the housing 1 through the same second hole.

[0270] In the present embodiment, by arranging the second current collecting member 6 on the outside of the outer shell 1, and providing a second hole on the outer shell 1 for the second pole ear 22 to pass through, the battery cell 10 adopting this structure can, on the one hand, reduce the internal space of the outer 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 improve 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 to maintain and replace the second current collecting member 6, which is beneficial to reduce the maintenance cost of the battery cell 10.

[0271] In some embodiments, please refer to Figure 5-Figure 7, along the first direction X, the first pole tab 21 and the second pole tab 22 are both arranged at the same end of the main body 23. The first current collecting member 5 includes a first connecting portion 52 connecting each first pole tab 21, and the second current collecting member 6 includes a second connecting portion 62 connecting each second pole tab 22. The first connecting portion 52 and the second connecting portion 62 are both located on one side of the main body 23 where the first pole tab 21 and the second pole tab 22 are arranged in the first direction X, and the first connecting portion 52 and the second connecting portion 62 are arranged at intervals.

[0272] The first connection portion 52 is a portion of the first current collecting member 5 located on the side of the main body 23 provided with the first pole tab 21 in the first direction X, and the first connection portion 52 serves to connect the first pole tabs 21 of the plurality of electrode assemblies 2. The first connection portion 52 may be a portion of the first current collecting member 5, or the first connection portion 52 may be the first current collecting member 5. Similarly, the second connection portion 62 is a portion of the second current collecting member 6 located on the side of the main body 23 provided with the second pole tab 22 in the first direction X, and the second connection portion 62 serves to connect the second pole tabs 22 of the plurality of electrode assemblies 2. The second connection portion 62 may be a portion of the second current collecting member 6, or the second connection portion 62 may be the second current collecting member 6.

[0273] The first connection portion 52 serves to connect the first pole tabs 21 of the plurality of electrode assemblies 2, and the connection structure between the first connection portion 52 and the first pole tab 21 can be various, such as welding connection, abutment, or conductive adhesive bonding, etc. Similarly, the second connection portion 62 serves to connect the second pole tabs 22 of the plurality of electrode assemblies 2, and the connection structure between the second connection portion 62 and the second pole tab 22 can be various, such as welding connection, abutment, or conductive adhesive bonding, etc.

[0274] As an example, a plurality of electrode assemblies 2 are arranged along the second direction Y, the first pole tab 21 and the second pole tab 22 are arranged along the third direction Z, the first current collecting member 5 and the second current collecting member 6 are located in the housing 1 and arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. 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.

[0275] 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 connection 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 connection portion 62.

[0276] In the present 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 connection portion 52 of the first current collecting member 5 and the second connection 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, the first current collecting member 5 and the second current collecting member 6 can share a 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 rate of the battery cell 10 and improving the volume energy density of the battery cell 10.

[0277] In some embodiments, please refer to Figure 5 The battery cell 10 may include a first insulating member 71, which is disposed along the first direction X on a side of the first connection portion 52 and the second connection portion 62 away from the main body 23 to insulate and isolate the first connection portion 52 and the housing 1 and the second connection portion 62 and the housing 1.

[0278] As an example, the first insulating member 71 is located in the housing 1, and along the first direction X, the first insulating member 71 is located between the first connection portion 52 of the first current collecting member 5 and the housing 1 and between the second connection portion 62 of the second current collecting member 6 and the shell 11, so that the first connection portion 52 and the second connection portion 62 can be insulated and isolated from the housing 1 by the first insulating member 71. The first insulating member 71 is an insulating material, such as rubber, silicone or plastic.

[0279] In the present 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 such a structure can, on the one hand, realize 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 reduce 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, 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 can share a first insulating member 71, which is beneficial to optimize the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10.

[0280] In some embodiments, please refer to Figure 5 The battery cell 10 may include a second insulating member 72 , which is disposed along the first direction X on a side of the first connection portion 52 and the second connection portion 62 facing the main body 23 to insulate and isolate the first connection portion 52 and the main body 23 and the second connection portion 62 and the main body 23 .

[0281] As an example, the second insulating member 72 is located in 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 and 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.

[0282] 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, 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 can share a second insulating member 72, which is beneficial to optimizing the assembly process of the battery cell 10 and can reduce the manufacturing cost of the battery cell 10.

[0283] In some embodiments, please refer to Figure 5 , 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 arranged on the side of the main body 23 facing the first wall portion 13. The first wall portion 13 is provided with a first electrode terminal 3 and a 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.

[0284] 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 13 along the first direction X, and the arrangement direction of the main body 23 of the electrode assembly 2 and the first wall 13 is parallel to the arrangement direction of the main body 23 and the pole ears (the first pole ear 21 and the second pole ear 22).

[0285] The first wall portion 13 is a wall portion of the housing 1 located in the first direction X and provided with the first electrode terminal 3 and the second electrode terminal 4. As an example, the thickness direction of the first wall portion 13 is parallel to the first direction X, and the first electrode terminal 3 and the second electrode terminal 4 are arranged along the third direction Z. In the embodiment where the first current collecting member 5 and the second current collecting member 6 are located in the housing 1, along the first direction X, the first connection portion 52 of the first current collecting member 5 and the second connection portion 62 of the second current collecting member 6 are both located between the first wall portion 13 and the main body portion 23.

[0286] The first wall portion 13 may be the end cover 12 in the housing 1, or may be a wall portion of the shell 11 of the housing 1. Figure 5 In the illustrated embodiment, the first wall portion 13 is an end cover 12 .

[0287] As an example, the first current collecting member 5 includes a first convex portion 53, which is convexly provided on the surface of the first connection portion 52 facing the first wall portion 13, and the first convex portion 53 is connected to the first electrode terminal 3, so as to more conveniently realize the electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second convex portion 63, which is convexly provided on the surface of the second connection portion 62 facing the first wall portion 13, and the second convex portion 63 is connected to the second electrode terminal 4, so as to more conveniently realize the electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0288] In the present 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 respectively connected to the first current collecting member 5 and the second current collecting member 6 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 beneficial 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.

[0289] In some embodiments, please refer to Figure 12-16 , Fig.12 An exploded view of a battery cell 10 (a first pole tab 21 and a second pole tab 22 are disposed at the same end of a main body 23 ) provided in some further embodiments of the present application; Fig.13 for Fig.12 An assembly diagram of the battery cell 10 is shown; Fig.14 for Fig.12 The assembly diagram of the electrode assembly 2, the first current collecting member 5, and the second current collecting member 6 shown; Fig.15 for Fig.12 The structural schematic diagram of the first current collecting member 5 is shown; Fig.16 for Fig.12 The schematic diagram of the structure of the second current collecting member 6 is shown. A plurality of electrode assemblies 2 are arranged along the second direction Y, and the second direction Y intersects with the first direction X. The first current collecting member 5 includes a third connection portion 54, which is connected to the first connection portion 52, and the second current collecting member 6 includes a fourth connection portion 64, which is connected to the second connection portion 62. Along the second direction Y, the housing 1 includes a second wall portion 14, and the third connection portion 54 and the fourth connection portion 64 are both located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14. Among them, the second wall portion 14 is provided with a first electrode terminal 3 and a second electrode terminal 4, and the third connection portion 54 and the fourth connection portion 64 are respectively connected to the first electrode terminal 3 and the second electrode terminal 4.

[0290] 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, and 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 in 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.

[0291] The first connection part 52 and the third connection part 54 can be an integral structure, that is, the first connection part 52 and the third connection part 54 are integrally formed, and the first connection part 52 and the third connection part 54 can be made by an integral forming process such as stamping or casting. Of course, the first connection part 52 and the third connection part 54 can also be a split structure, that is, the first connection part 52 and the third connection part 54 are separately arranged, and the first connection part 52 and the third connection part 54 can be connected by welding connection or bolt screw connection. Similarly, the second connection part 62 and the fourth connection part 64 can be an integral structure, that is, the second connection part 62 and the fourth connection part 64 are integrally formed, and the second connection part 62 and the fourth connection part 64 can be made by an integral forming process such as stamping or casting. Of course, the second connection part 62 and the fourth connection part 64 can also be a split structure, that is, the second connection part 62 and the fourth connection part 64 are separately arranged, and the second connection part 62 and the fourth connection part 64 can be connected by welding connection or bolt screw connection.

[0292] 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 arranged opposite to 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 in the housing 1, along the first direction X, the first connecting portion 52 and the second connecting portion 62 are both arranged between the main body 23 of the plurality of electrode assemblies 2 and the first wall portion 13, the first insulating member 71 is arranged 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, and along the second direction Y, the third connecting portion 54 and the fourth connecting portion 64 are both arranged between the main body 23 of the plurality of electrode assemblies 2 and the second wall portion 14.

[0293] The first wall portion 13 may be the end cover 12 in the housing 1, or may be a wall portion of the shell 11 of the housing 1. Fig.12 and Fig.13 In the illustrated embodiment, the second wall portion 14 is an end cap 12 .

[0294] As an example, the first current collecting member 5 includes a first convex portion 53, which is convexly provided on the surface of the third connection portion 54 facing the second wall portion 14, and the first convex portion 53 is connected to the first electrode terminal 3, so as to more conveniently realize the electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second convex portion 63, which is convexly provided on the surface of the fourth connection portion 64 facing the second wall portion 14, and the second convex portion 63 is connected to the second electrode terminal 4, so as to conveniently realize the electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0295] In the present embodiment, the plurality of electrode assemblies 2 are arranged along the second direction Y, and the housing 1 includes a second wall portion 14 arranged along the second direction Y, so that the second wall portion 14 is arranged in the same direction as the plurality of electrode assemblies 2. The first current collecting member 5 has a third connection portion 54 connected to the first connection portion 52, and the second current collecting member 6 has a fourth connection portion 64 connected to the second connection portion 62. By connecting the third connection portion 54 to the first electrode terminal 3 provided on the second wall portion 14, and connecting the first connection portion 52 to the first pole tabs 21 of the plurality of electrode assemblies 2, the first pole tab 21 is electrically connected to the first electrode terminal 3 through the first current collecting member 5, and by connecting the fourth connection portion 64 to the second electrode terminal 4 provided on the second wall portion 14, and connecting the second connection portion 62 to the second pole tabs 22 of the plurality of electrode assemblies 2, the second pole tab 22 is electrically connected to the second electrode terminal 4 through the second current collecting member 6. In the battery cell 10 with such a structure, the first electrode terminal 3 and the second electrode terminal 4 are arranged 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 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 pole 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 pole 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 pole tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second pole tab 22, and can reduce the interference problem between the first electrode terminal 3 and the first pole tab 21 and between the second electrode terminal 4 and the second pole 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 beneficial 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.

[0296] In some embodiments, please refer to Fig.12The battery cell 10 may include a third insulating member 73, which 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.

[0297] 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 as to insulate and isolate the third connecting portion 54 from the electrode assembly 2 and the fourth connecting portion 64 from the electrode assembly 2 through the third insulating member 73. The third insulating member 73 is made of an insulating material, such as rubber, silicone or plastic.

[0298] 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 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 share 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.

[0299] In some embodiments, please refer to Fig.12 Along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the third connecting portion 54 is accommodated in the first slot 731 .

[0300] The first clamping groove 731 is provided on the surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be clamped in the first clamping groove 731. As an example, the thickness of the third connection portion 54 in the second direction Y is less than or equal to the depth of the first clamping groove 731 in the second direction Y, so that the third connection portion 54 does not extend out of the first clamping groove 731 in the second direction Y.

[0301] In this embodiment, a first 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 slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the plurality of 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.

[0302] In some embodiments, please refer to Fig.12Along the second direction Y, a second slot 732 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the fourth connecting portion 64 is accommodated in the second slot 732 .

[0303] The second slot 732 is provided on the surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be stuck in the second slot 732. As an example, the thickness of the fourth connection portion 64 in the second direction Y is less than or equal to the depth of the second slot 732 in the second direction Y, so that the fourth connection portion 64 does not extend out of the second slot 732 in the second direction Y.

[0304] In this embodiment, a second 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 slot 732, thereby improving the structural stability of the third insulating assembly between the fourth connection portion 64 and the plurality of 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 rate of the battery cell 10.

[0305] In some embodiments, please refer to Fig.17 and Fig.18 , Fig.17 An exploded view of a battery cell 10 (the first pole tab 21 and the second pole tab 22 are disposed at the same end of the main body 23 ) provided in some other embodiments of the present application; Fig.18 for Fig.17 The assembly diagram of the battery cell 10 shown. The plurality of electrode assemblies 2 are arranged along the second direction Y, and the second direction Y intersects with the first direction X. The first current collecting member 5 includes a third connection portion 54, which is connected to the first connection portion 52, and the second current collecting member 6 includes a fourth connection portion 64, which is connected to the second connection portion 62. Along the second direction Y, the housing 1 includes a second wall portion 14 and a third wall portion 15 that are arranged opposite to each other, and the third connection portion 54 is located on the side of the plurality of electrode assemblies 2 facing the second wall portion 14, and the fourth connection portion 64 is located on the side of the plurality of electrode assemblies 2 facing the third wall portion 15. Among them, the second wall portion 14 is provided with a first electrode terminal 3, and the third wall portion 15 is provided with a second electrode terminal 4, and the third connection portion 54 and the fourth connection portion 64 are respectively connected to the first electrode terminal 3 and the second electrode terminal 4.

[0306] 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, and 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 in 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.

[0307] The second wall portion 14 and the third wall portion 15 are two wall portions in the housing 1 that are arranged opposite to each other along the second direction Y. As an example, the thickness direction of the second wall portion 14 and the thickness direction of the third wall portion 15 are both parallel to the second direction Y. The housing 1 includes a first wall portion 13 that is arranged opposite to the plurality of electrode assemblies 2 along the first direction X, the first wall portion 13 connects the second wall portion 14 and the third wall portion 15, the first current collecting member 5 and the second current collecting member 6 are located in the housing 1, along the first direction X, the first connection portion 52 and the second connection portion 62 are both arranged between the main body 23 of the plurality of electrode assemblies 2 and the first wall portion 13, the first insulating member 71 is arranged between the first connection portion 52 and the first wall portion 13 and between the second connection portion 62 and the first wall portion 13, along the second direction Y, the third connection portion 54 is located between the main body 23 of the plurality of electrode assemblies 2 and the second wall portion 14, and the fourth connection portion 64 is located between the main body 23 of the plurality of electrode assemblies 2 and the third wall portion 15.

[0308] 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 to the end cap 12; or both may be two end caps 12 or two opposite walls of the housing 11. Fig.17 and Fig.18 In the illustrated embodiment, the second wall portion 14 and the third wall portion 15 are two opposite end covers 12 in the housing 1 .

[0309] As an example, the first current collecting member 5 includes a first convex portion 53, which is convexly provided on the surface of the third connection portion 54 facing the second wall portion 14, and the first convex portion 53 is connected to the first electrode terminal 3, so as to more conveniently realize the electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second convex portion 63, which is convexly provided on the surface of the fourth connection portion 64 facing the third wall portion 15, and the second convex portion 63 is connected to the second electrode terminal 4, so as to conveniently realize the electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0310] In the present embodiment, the first electrode terminal 3 and the second electrode terminal 4 are respectively arranged on the second wall portion 14 and the third wall portion 15 which are arranged opposite to each other in 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 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 far apart, 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.

[0311] In some embodiments, please refer to Fig.17 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 connection portion 54 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the third connection portion 54 from the electrode assemblies 2. The fourth insulating member 74 is disposed between the fourth connection portion 64 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the fourth connection portion 64 from the electrode assemblies 2.

[0312] As an example, the third insulating member 73 and the fourth insulating member 74 are arranged opposite to each other along the second direction Y, and the third insulating member 73 and the fourth insulating member 74 are located in 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, and the third insulating member 73 is closer to the second wall portion 14 than the fourth insulating member 74. It can 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. Among them, 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 as to insulate and isolate the third connecting portion 54 from the electrode assembly 2 through the third insulating member 73, and to insulate and isolate the fourth connecting portion 64 from the electrode assembly 2 through the fourth insulating member 74. The third insulating member 73 and the fourth insulating member 74 are made of insulating materials, such as rubber, silicone or plastic.

[0313] 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.

[0314] In some embodiments, please refer to Fig.17 Along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the third connecting portion 54 is accommodated in the first slot 731 .

[0315] The first clamping groove 731 is provided on the surface of the third insulating member 73 facing the second wall portion 14 in the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be clamped in the first clamping groove 731. As an example, the thickness of the third connection portion 54 in the second direction Y is less than or equal to the depth of the first clamping groove 731 in the second direction Y, so that the third connection portion 54 does not extend out of the first clamping groove 731 in the second direction Y.

[0316] In this embodiment, a first card slot 731 is provided on a side of the third insulating member 73 away from the plurality of 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 plurality of 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 rate of the battery cell 10.

[0317] In some embodiments, please refer to Fig.17 Along the second direction Y, a second slot 732 is provided on a side of the fourth insulating member 74 away from the plurality of electrode assemblies 2 , and the fourth connecting portion 64 is accommodated in the second slot 732 .

[0318] The second slot 732 is provided on the surface of the fourth insulating member 74 facing the third wall portion 15 in the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be stuck in the second slot 732. As an example, the thickness of the fourth connection portion 64 in the second direction Y is less than or equal to the depth of the second slot 732 in the second direction Y, so that the fourth connection portion 64 does not extend out of the second slot 732 in the second direction Y.

[0319] In this embodiment, a second 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 connecting 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 connecting portion 64 and the multiple electrode assemblies 2, and the fourth insulating member 74 and the fourth connecting portion 64 can share space in the second direction Y, which is beneficial to improving the internal space utilization of the battery cell 10.

[0320] In some embodiments, please refer to Figure 19-Figure 23 , Fig.19An exploded view of a battery cell 10 (a first pole tab 21 and a second pole tab 22 are disposed at opposite ends of a main body 23 ) provided in some embodiments of the present application; Fig. 20 for Fig.19 An assembly diagram of the battery cell 10 is shown; Fig.21 for Fig.19 The schematic diagram of the connection between the electrode assembly 2, the first current collecting member 5 and the second current collecting member 6 is shown; Fig. 22 for Fig.19 The structural schematic diagram of the first current collecting member 5 is shown; Fig.23 for Fig.19 The schematic diagram of the structure of the second current collecting member 6 is shown. Along the first direction X, the first pole tab 21 and the second pole tab 22 are respectively arranged at opposite ends of the main body 23. Among them, the first current collecting member 5 includes a first connecting portion 52 connecting each first pole tab 21, and the first connecting portion 52 is located on the side of the main body 23 where the first pole tab 21 is arranged in the first direction X. The second current collecting member 6 includes a second connecting portion 62 connecting each second pole tab 22, and the second connecting portion 62 is located on the side of the main body 23 where the second pole tab 22 is arranged in the first direction X.

[0321] The first connection portion 52 is a portion of the first current collecting member 5 located on the side of the main body 23 provided with the first pole tab 21 in the first direction X, and the first connection portion 52 plays a role in connecting the first pole tabs 21 of the plurality of electrode assemblies 2. The first connection portion 52 may be a part of the first current collecting member 5, or the first connection portion 52 may be the first current collecting member 5. The connection structure between the first connection portion 52 and the first pole tab 21 may be various, such as welding connection, abutment, or conductive adhesive bonding. The second connection portion 62 is a portion of the second current collecting member 6 located on the side of the main body 23 provided with the second pole tab 22 in the first direction X, and the second connection portion 62 plays a role in connecting the second pole tabs 22 of the plurality of electrode assemblies 2. The second connection portion 62 may be a part of the second current collecting member 6, or the second connection portion 62 may be the second current collecting member 6. The second connection portion 62 plays a role in connecting the second pole tabs 22 of the plurality of electrode assemblies 2, and the connection structure between the second connection portion 62 and the second pole tab 22 may be various, such as welding connection, abutment, or conductive adhesive bonding.

[0322] As an example, a plurality of electrode assemblies 2 are arranged along the second direction Y, the first pole tab 21 and the second pole tab 22 are arranged along the first direction X, the first current collecting member 5 and the second current collecting member 6 are located in the housing 1 and arranged along the first direction X, the first connecting portion 52 and the second connecting portion 62 are arranged oppositely along the first direction X, the housing 1 is in the shape of a rectangular parallelepiped, the third direction Z is parallel to the height direction of the housing 1, and along the third direction Z, the area of ​​the outer surface of the two opposite walls of the housing 1 is greater than the area of ​​the outer surface of the other walls. The first direction X, the second direction Y and the third direction Z are not coplanar and intersect 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 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.

[0323] The housing 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 housing 1, for example, the first electrode terminal 3 and the second electrode terminal 4 are provided on two opposite walls of the housing 1 along the first direction X, and for another example, the first electrode terminal 3 and the second electrode terminal 4 are provided on two adjacent walls of the housing 1. The first electrode terminal 3 and the second electrode terminal 4 can also be provided on the same wall of the housing 1, for example, the first electrode terminal 3 and the second electrode terminal 4 are provided on the same wall of the housing 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 housing 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 housing 1 along the third direction Z.

[0324] 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 connection 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 connection portion 62.

[0325] In the present embodiment, by respectively arranging the first pole tab 21 and the second pole tab 22 at the two ends of the main body 23 in the first direction X, and respectively arranging the first connection portion 52 of the first current collecting member 5 and the second connection portion 62 of the second current collecting member 6 at the two 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 pole tab 21 and the second pole 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, the first pole tab 21 and the second pole tab 22 with opposite polarities can be kept away from each other, and the first connection portion 52 of the first current collecting member 5 and the second connection portion 62 of the second current collecting member 6 can be kept away from each other, which is conducive to reducing the risk of short circuit between the first pole tab 21 and the second pole tab 22 and between the first current collecting member 5 and the second current collecting member 6, so as to improve the reliability of the battery cell 10.

[0326] In some embodiments, please refer to Fig.19 The battery cell 10 may include two first insulating members 71, which 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 connecting portion 52 away from the main body 23 to insulate and isolate the first connecting portion 52 and the outer shell 1, and the other first insulating member 71 is located on the side of the second connecting portion 62 away from the main body 23 to insulate and isolate the second connecting portion 62 and the outer shell 1.

[0327] As an example, two first insulating members 71 are located in the housing 1, along the first direction X, one first insulating member 71 is located between the first connection portion 52 of the first current collecting member 5 and a wall portion of the housing 1, and the other first insulating member 71 is located between the second connection portion 62 of the second current collecting member 6 and another wall portion of the housing 1, so that the first connection portion 52 and the second connection portion 62 can be insulated and isolated from the housing 1 by the two first insulating members 71, respectively. The first insulating member 71 is made of an insulating material, such as rubber, silicone or plastic.

[0328] 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 reduce the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the outer shell 1, so as to improve the reliability of the battery cell 10.

[0329] In some embodiments, please refer to Fig.19The battery cell 10 may include two second insulating members 72, which are respectively arranged on both sides of the plurality of electrode assemblies 2 along the first direction X. Along the first direction X, one second insulating member 72 is located on a side of the first connection portion 52 facing the main body portion 23 to insulate and isolate the first connection portion 52 and the main body portion 23, and the other second insulating member 72 is located on a side of the second connection portion 62 facing the main body portion 23 to insulate and isolate the second connection portion 62 and the main body portion 23.

[0330] As an example, two second insulating members 72 are located in 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, so that the first connecting portion 52 and the second connecting portion 62 can be insulated and isolated from the main body 23 by the two second insulating members 72, respectively. The second insulating member 72 is an insulating material, such as rubber, silicone or plastic.

[0331] 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 reduce the risk of short circuit between the first current collecting member 5 and the second current collecting member 6 and the main body 23, so as to improve the reliability of the battery cell 10.

[0332] In some embodiments, please refer to Figure 19-Figure 23 , the plurality of electrode assemblies 2 are arranged along the second direction Y, and the second direction Y intersects with the first direction X. The first current collecting member 5 includes a third connection portion 54, which is connected to the first connection portion 52, and the second current collecting member 6 includes a fourth connection portion 64, which is connected to the second connection portion 62. Along the second direction Y, the housing 1 includes a first wall portion 13, and the third connection portion 54 and the fourth connection portion 64 are both located on the side of the plurality of electrode assemblies 2 facing the first wall portion 13. Among them, the first wall portion 13 is provided with a first electrode terminal 3 and a second electrode terminal 4, and the third connection portion 54 and the fourth connection portion 64 are connected to the first electrode terminal 3 and the second electrode terminal 4, respectively.

[0333] The third connection portion 54 is a portion of the first current collecting member 5 located on a side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y, and the fourth connection portion 64 is a portion of the second current collecting member 6 located on a side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y. In the embodiment where the first current collecting member 5 and the second current collecting member 6 are located in 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.

[0334] The first connection part 52 and the third connection part 54 can be an integral structure, that is, the first connection part 52 and the third connection part 54 are integrally formed, and the first connection part 52 and the third connection part 54 can be made by an integral forming process such as stamping or casting. Of course, the first connection part 52 and the third connection part 54 can also be a split structure, that is, the first connection part 52 and the third connection part 54 are separately arranged, and the first connection part 52 and the third connection part 54 can be connected by welding connection or bolt screw connection. Similarly, the second connection part 62 and the fourth connection part 64 can be an integral structure, that is, the second connection part 62 and the fourth connection part 64 are integrally formed, and the second connection part 62 and the fourth connection part 64 can be made by an integral forming process such as stamping or casting. Of course, the second connection part 62 and the fourth connection part 64 can also be a split structure, that is, the second connection part 62 and the fourth connection part 64 are separately arranged, and the second connection part 62 and the fourth connection part 64 can be connected by welding connection or bolt screw connection.

[0335] The first wall portion 13 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 first wall portion 13 is parallel to the second direction Y. The first current collecting member 5 and the second current collecting member 6 are located in the housing 1. Along the first direction X, the first connection 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 connection 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 connection portion 54 and the fourth connection portion 64 are both provided between the main body 23 of the plurality of electrode assemblies 2 and the first wall portion 13.

[0336] The first wall portion 13 may be the end cover 12 in the housing 1, or may be a wall portion of the shell 11 of the housing 1. Fig.19 and Fig. 20 In the illustrated embodiment, the first wall portion 13 is an end cover 12 .

[0337] As an example, the first current collecting member 5 includes a first convex portion 53, which is convexly provided on the surface of the third connection portion 54 facing the first wall portion 13, and the first convex portion 53 is connected to the first electrode terminal 3, so as to more conveniently realize the electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second convex portion 63, which is convexly provided on the surface of the fourth connection portion 64 facing the first wall portion 13, and the second convex portion 63 is connected to the second electrode terminal 4, so as to conveniently realize the electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0338] In the present 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, 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 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, the battery cell 10 is structured such that the first electrode terminal 3 and the second electrode terminal 4 are provided 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 enhancing the volume energy density of the battery cell 10. In addition, in the battery cell 10 with such a 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 pole 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 pole 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 pole tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second pole tab 22, and can reduce the interference problem between the first electrode terminal 3 and the first pole tab 21 and between the second electrode terminal 4 and the second pole 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 beneficial 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.

[0339] In some embodiments, please refer to Fig.19 The battery cell 10 may include a third insulating member 73, which 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.

[0340] As an example, the third insulating member 73 is located in the housing 1, along the second direction Y, the third insulating member 73 is located on the side of the plurality of electrode assemblies 2 facing the first wall portion 13, and 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 as to insulate and isolate the third connecting portion 54 from the electrode assembly 2 and the fourth connecting portion 64 from the electrode assembly 2 through the third insulating member 73. The third insulating member 73 is made of an insulating material, such as rubber, silicone or plastic.

[0341] 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 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 share 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.

[0342] In some embodiments, please refer to Fig.19 Along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the third connecting portion 54 is accommodated in the first slot 731 .

[0343] The first clamping groove 731 is provided on the surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be clamped in the first clamping groove 731. As an example, the thickness of the third connection portion 54 in the second direction Y is less than or equal to the depth of the first clamping groove 731 in the second direction Y, so that the third connection portion 54 does not extend out of the first clamping groove 731 in the second direction Y.

[0344] In this embodiment, a first 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 slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the plurality of 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.

[0345] In some embodiments, please refer to Fig.19 Along the second direction Y, a second slot 732 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the fourth connecting portion 64 is accommodated in the second slot 732 .

[0346] The second slot 732 is provided on the surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be stuck in the second slot 732. As an example, the thickness of the fourth connection portion 64 in the second direction Y is less than or equal to the depth of the second slot 732 in the second direction Y, so that the fourth connection portion 64 does not extend out of the second slot 732 in the second direction Y.

[0347] In this embodiment, a second 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 slot 732, thereby improving the structural stability of the third insulating assembly between the fourth connection portion 64 and the plurality of 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 rate of the battery cell 10.

[0348] In some embodiments, please refer to Fig.24 , Fig.24 An exploded view of a battery cell 10 (a first pole ear 21 and a second pole ear 22 are arranged at opposite ends of a main body 23) provided for other embodiments of the present application. A plurality of electrode assemblies 2 are arranged along a second direction Y, and the second direction Y intersects with the first direction X; the first current collecting member 5 includes a third connection portion 54, which is connected to the first connection portion 52, and the second current collecting member 6 includes a fourth connection portion 64, which is connected to the second connection portion 62. Along the second direction Y, the housing 1 includes a first wall portion 13 and a second wall portion 14 arranged opposite to each other, the third connection portion 54 is located on a side of the plurality of electrode assemblies 2 facing the first wall portion 13, and the fourth connection portion 64 is located on a side of the plurality of electrode assemblies 2 facing the second wall portion 14; wherein the first wall portion 13 is provided with a first electrode terminal 3, the second wall portion 14 is provided with a second electrode terminal 4, and the third connection portion 54 and the fourth connection portion 64 are connected to the first electrode terminal 3 and the second electrode terminal 4, respectively.

[0349] The third connection portion 54 is a portion of the first current collecting member 5 located on a side of the plurality of electrode assemblies 2 facing the first wall portion 13 along the second direction Y, and the fourth connection portion 64 is a portion of the second current collecting member 6 located on a 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 in 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.

[0350] The first wall portion 13 and the third wall portion 15 are two wall portions in the housing 1 that are arranged opposite to each other along the second direction Y. As an example, the thickness direction of the first wall portion 13 and the thickness direction of the second wall portion 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 located in the housing 1. Along the first direction X, the first connection portion 52 is arranged between the main body portion 23 of the plurality of electrode assemblies 2 and one wall portion of the housing 1, and the second connection portion 62 is arranged between the main body portion 23 of the plurality of electrode assemblies 2 and another wall portion of the housing 1. Along the second direction Y, the third connection portion 54 is arranged between the main body portion 23 of the plurality of electrode assemblies 2 and the first wall portion 13, and the fourth connection portion 64 is arranged between the main body portion 23 of the plurality of electrode assemblies 2 and the second wall portion 14.

[0351] One of the first wall portion 13 and the second wall portion 14 may be the end cover 12, and the other may be the wall portion of the housing 11 opposite to the end cover 12; or both may be two end covers 12 or two opposite walls of the housing 11. Fig.24 In the illustrated embodiment, the first wall portion 13 and the second wall portion 14 are two opposite end covers 12 in the housing 1 .

[0352] As an example, the first current collecting member 5 includes a first convex portion 53, which is convexly provided on the surface of the third connection portion 54 facing the first wall portion 13, and the first convex portion 53 is connected to the first electrode terminal 3, so as to more conveniently realize the electrical connection between the first current collecting member 5 and the first electrode terminal 3. The second current collecting member 6 includes a second convex portion 63, which is convexly provided on the surface of the fourth connection portion 64 facing the second wall portion 14, and the second convex portion 63 is connected to the second electrode terminal 4, so as to conveniently realize the electrical connection between the second current collecting member 6 and the second electrode terminal 4.

[0353] 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, and 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 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. In addition, with the battery cell 10 of this structure, the first electrode terminal 3 and the second electrode terminal 4 are respectively arranged 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 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 pole 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 pole 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 pole tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second pole tab 22, and can reduce the interference problem between the first electrode terminal 3 and the first pole tab 21 and between the second electrode terminal 4 and the second pole 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 beneficial 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.

[0354] In some embodiments, please refer to Fig.24The 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 connection portion 54 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the third connection portion 54 from the electrode assemblies 2. The fourth insulating member 74 is disposed between the fourth connection portion 64 and the plurality of electrode assemblies 2 along the second direction Y to insulate and isolate the fourth connection portion 64 from the electrode assemblies 2.

[0355] The third insulating member 73 and the fourth insulating member 74 are arranged opposite to each other along the second direction Y. As an example, the third insulating member 73 and the fourth insulating member 74 are located in 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, and the third insulating member 73 is closer to the first wall portion 13 than the fourth insulating member 74. It can be understood that along the second direction Y, a plurality of electrode assemblies 2 are located between the third insulating member 73 and the fourth insulating member 74. Among them, 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 as to insulate and isolate the third connecting portion 54 from the electrode assembly 2 through the third insulating member 73, and to insulate and isolate the fourth connecting portion 64 from the electrode assembly 2 through the fourth insulating member 74. The third insulating member 73 and the fourth insulating member 74 are made of insulating materials, such as rubber, silicone or plastic.

[0356] 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.

[0357] In some embodiments, please refer to Fig.24 Along the second direction Y, a first slot 731 is provided on a side of the third insulating member 73 away from the plurality of electrode assemblies 2 , and the third connecting portion 54 is accommodated in the first slot 731 .

[0358] The first clamping groove 731 is provided on the surface of the third insulating member 73 facing the first wall portion 13 in the second direction Y, so that the third connection portion 54 of the first current collecting member 5 can be clamped in the first clamping groove 731. As an example, the thickness of the third connection portion 54 in the second direction Y is less than or equal to the depth of the first clamping groove 731 in the second direction Y, so that the third connection portion 54 does not extend out of the first clamping groove 731 in the second direction Y.

[0359] In this embodiment, a first 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 slot 731, thereby improving the structural stability of the third insulating assembly between the third connection portion 54 and the plurality of 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.

[0360] In some embodiments, please refer to Fig.24 Along the second direction Y, a second slot 732 is provided on a side of the fourth insulating member 74 away from the plurality of electrode assemblies 2 , and the fourth connecting portion 64 is accommodated in the second slot 732 .

[0361] The second slot 732 is provided on the surface of the fourth insulating member 74 facing the second wall portion 14 in the second direction Y, so that the fourth connection portion 64 of the second current collecting member 6 can be stuck in the second slot 732. As an example, the thickness of the fourth connection portion 64 in the second direction Y is less than or equal to the depth of the second slot 732 in the second direction Y, so that the fourth connection portion 64 does not extend out of the second slot 732 in the second direction Y.

[0362] 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 connecting 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 connecting portion 64 and the plurality of electrode assemblies 2, and the fourth insulating member 74 and the fourth connecting portion 64 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, please refer to Fig.25 , Fig.25 An exploded view of a battery cell 10 (with a separator 8 disposed in the housing 1) provided in some embodiments of the present application. The battery cell 10 includes a plurality of electrode assemblies 2, the housing 1 has a receiving space, and the plurality of electrode assemblies 2 are received in the receiving space; the battery cell 10 includes a separator 8, which is disposed in the receiving space, and is configured to separate the receiving space into a plurality of subspaces 81, each of which receives at least one electrode assembly 2.

[0364] The separator 8 is a component in the battery cell 10 that divides the accommodation space of the housing 1 into a plurality of subspaces 81. The subspaces 81 may be defined by the separator 8 and the housing 1 together, or by the separator 8. For example, the subspaces 81 are formed inside the separator 8. The separator 8 is disposed in the accommodation space. The separator 8 may be connected to the housing 1 to fix the separator 8 to the housing 1. For example, the separator 8 may be connected to the end cover 12 of the housing 1, or the separator 8 may be connected to the shell 11 of the housing 1. Alternatively, the separator 8 may be placed in the housing 1, and the separator 8 and the housing 1 only keep in contact, but the two are not connected together. For example, the separator 8 may be placed in the shell 11 of the housing 1, and the separator 8 and the shell 11 are in contact.

[0365] In the housing 1, the total space of the multiple subspaces 81 is a part of the accommodation space, and each subspace 81 can accommodate one electrode assembly 2 or multiple electrode assemblies 2. The multiple subspaces 81 can be arranged along a certain direction. For example, when the housing 1 is a rectangular battery cell 10, 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 along multiple directions, for example, the multiple subspaces 81 are distributed in multiple rows and columns.

[0366] It should be noted that, in the present embodiment, the first electrode tab 21 and the second electrode tab 22 may be disposed at the same end of the main body 23 along the first direction X, or the first electrode tab 21 and the second electrode tab 22 may be disposed 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 may be disposed on the same side of the main body 23 along the first direction X, or the first current collecting member 5 and the second current collecting member 6 may be disposed on opposite sides of the main body 23 along the first direction X. The first electrode terminal 3 and the second electrode terminal 4 may be disposed on the same wall of the housing 1, or may be disposed on two opposite walls of the housing 1, respectively. The first electrode terminal 3 and the second electrode terminal 4 may be disposed on the wall of the housing 1 in the first direction X, or may be disposed on the wall of the housing 1 in the second direction Y. The first direction X intersects with the second direction Y.

[0367] As an example, in Fig.25 In the embodiment, a plurality of electrode assemblies 2 are arranged along a second direction Y, a first electrode ear 21 and a second electrode ear 22 are arranged at the same end of a main body 23 along a first direction X, a first current collecting member 5 and a second current collecting member 6 are arranged along a third direction Z, a first current collecting member 5 and a second current collecting member 6 are arranged on one side of the plurality of electrode assemblies 2 along the first direction X, a first electrode terminal 3 and a second electrode terminal 4 are arranged on the same wall portion of a shell 11, and the wall portion is arranged opposite to the plurality of 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.

[0368] In this embodiment, a partition device 8 is provided in the accommodation space of the outer shell 1, and the partition device 8 divides the accommodation space into a plurality of subspaces 81. The partition device 8 plays a role of separating the electrode assemblies 2 in each subspace 81, so as to reduce the risk of expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 81, thereby reducing the risk of mutual squeezing and deformation of the electrode assemblies 2, thereby effectively improving the reliability of the battery cell 10.

[0369] In some embodiments, please refer to Fig.26 and Fig. 27 , Fig.26 for Fig.25 The schematic diagram of the connection between the housing 11 and the partition device 8 is shown; Fig. 27 for Fig.26 The housing 11 is shown in a cross-sectional view taken along the XY section. The partition device 8 includes a partition wall 82 configured to separate two adjacent subspaces 81 , and an accommodation cavity 821 is formed inside the partition wall 82 . The battery cell 10 includes a thermal management component 9 , which is accommodated in the accommodation cavity 821 .

[0370] The partition wall 82 may be one or more. The partition wall 82 may be plate-shaped, and the partition wall 82 may be a solid structure or a hollow structure. The partition wall 82 may be connected to the shell 1 to achieve the partition wall 82 and the shell 1 being fixed, or the partition wall 82 may only keep contact with the shell 1.

[0371] 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 a plurality of accommodating cavities 821 .

[0372] The thermal management component 9 is a component for managing the temperature of the battery cell 10, and is used for heat exchange with the battery cell 10 to manage the temperature of the battery cell 10. The thermal management component 9 may be a heating component for heating the battery cell 10, or a cooling component for cooling the battery cell 10. The cooling component may be a heat sink, a water cooling plate, etc.

[0373] In the present embodiment, a accommodating cavity 821 is formed inside the partition wall 82, and the thermal management component 9 is disposed in the accommodating cavity 821 of the partition wall 82, so that the space inside the partition wall 82 is fully utilized. 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, thereby freeing up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10.

[0374] In some embodiments, please refer to Fig.28 , Fig.28 for Fig.25The schematic diagram of the structure of the housing 1 is shown. 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 communicated with the accommodating cavity 821 .

[0375] In this embodiment, the mouth 16 may be disposed on the outer surface of the shell 11 , or may be disposed on the outer surface of the end cover 12 , and the mouth 16 may correspond one-to-one to the partition wall 82 .

[0376] 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.

[0377] In some embodiments, please refer to Figure 25-27 The partition device 8 includes at least one partition wall 82 , which is disposed in the accommodating space and connected to the housing 1 . The partition wall 82 is configured to separate two adjacent subspaces 81 .

[0378] The partition wall 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; for another example, if there are two partition walls 82, there are three subspaces 81.

[0379] The partition wall 82 is connected to the outer shell 1 to fix 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 can be connected to multiple wall portions 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 wall portions of the outer shell 1, for example, a part of the multiple partition walls 82 is connected to the end cover 12, and another part is connected to the shell 11. As an example, in Figure 25-27 In the embodiment, all the partition walls 82 are connected to the wall portion of the shell 11 opposite to the end cover 12 .

[0380] In this embodiment, the accommodation space inside the housing 1 is divided into a plurality of subspaces 81 by at least one partition wall 82, and the structure is simple, and each partition wall 82 can separate the electrode assemblies 2 in two adjacent subspaces 81. Since the partition wall 82 is connected to the housing 1, the expansion force generated by the expansion of the electrode assembly 2 in the subspace 81 can be transmitted to the housing 1 through the partition wall 82, thereby 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.

[0381] In some embodiments, please refer to Figure 25-27 , the plurality of electrode assemblies 2 are arranged along the second direction Y, the partition device 8 includes a plurality of partition walls 82 , and along the second direction Y, the plurality of partition walls 82 are spaced apart in the accommodating space.

[0382] The plurality of partition walls 82 are arranged at intervals along the second direction Y, that is, there is a gap between every two adjacent partition walls 82 .

[0383] In this embodiment, the electrode assembly 2 may be cylindrical, flat, etc. As an example, Fig.25 In the embodiment, the electrode assembly 2 is flat, and the thickness direction of the electrode assembly 2 is parallel to the second direction Y.

[0384] Taking the case 1 as a rectangular parallelepiped as an example, the arrangement direction of the plurality of partition walls 82 may be parallel to the length direction, width direction or height direction of the case 1. As an example, the arrangement direction of the plurality of partition walls 82 is parallel to the length direction of the battery cell 10, and there are four partition walls 82, which divide the accommodation space into five subspaces 81.

[0385] 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 .

[0386] In this embodiment, a plurality of partition walls 82 arranged at intervals can divide the accommodating space into more subspaces 81, so that more electrode assemblies 2 in the 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.

[0387] In some embodiments, please refer to Fig.29 and Fig.30 , Fig.29 An exploded view of a battery cell 10 (with a separator 8 disposed in the housing 1) provided in some other embodiments of the present application; Fig.30 for Fig.29 The schematic structural diagram of the partition device 8 is shown. The subspace 81 is formed inside the partition device 8.

[0388] It can be understood that the subspace 81 is located both inside the housing 1 and inside the partition 8. The subspace 81 can be in various shapes, such as cylindrical or prism-shaped. The prism can be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, in Fig.29 In the figure, the subspace 81 is in the shape of a hexagonal prism.

[0389] 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 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.

[0390] In this embodiment, the electrode assembly 2 may be cylindrical or flat. Fig.29 , the electrode assembly 2 is cylindrical.

[0391] As an example, in Fig.29 In the embodiment, along the first direction X, the first pole tab 21 and the second pole tab 22 are arranged at opposite ends of the main body 23, the first current collecting member 5 and the second current collecting member 6 are respectively arranged at opposite sides of the plurality of electrode assemblies 2, and the first pole column and the second pole column are arranged at two opposite walls of the housing 1. Along the second direction Y, there are a plurality of subspaces 81 arranged in the partition device 8, and along the third direction Z, there are a plurality of subspaces 81 arranged in the partition 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 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.

[0392] 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 .

[0393] In some embodiments, please refer to Fig.30 The partition device 8 includes a plurality of receiving units 83 arranged in the accommodating space, and a subspace 81 is formed inside each receiving unit 83 .

[0394] The plurality of receiving units 83 in the partition device 8 may be independent of each other, or at least two receiving units 83 may be connected to each other. Fig.30In the embodiment, all the receiving units 83 are connected to each other to form a whole. In two adjacent receiving units 83, if the two receiving units 83 are connected to each other, they can be directly connected or indirectly connected through 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.

[0395] The receiving unit 83 may be a hollow structure with an opening at one end, or may be a hollow structure with openings at two opposite ends. Fig.30 In the embodiment, both ends of the receiving unit 83 along the first direction X are formed with openings, and the openings are communicated with the subspace 81 .

[0396] In this embodiment, the plurality of receiving units 83 can all receive the electrode assembly 2, and the receiving unit 83 can bear the expansion force of the electrode assembly 2 in multiple directions in the subspace 81. In addition, after the electrode assembly 2 is received in the receiving unit 83, the receiving unit 83 can restrict the electrode assembly 2, thereby reducing the risk of the electrode assembly 2 tilting or shaking inside the housing 1.

[0397] 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 .

[0398] 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 .

[0399] As an example, in Fig.30 In the figure, 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.

[0400] In this embodiment, two adjacent receiving units 83 share a partition wall 82. When the volume of the receiving space is constant, the volume of the subspace 81 can be increased to free up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10. In addition, two adjacent receiving units 83 share a partition wall 82, so that the multiple receiving units 83 can be used as a whole, and it is easier to install the partition device 8 in the housing 1.

[0401] Please refer to Fig.31 , Fig.31 A schematic diagram of the structure of the housing 1 provided for some embodiments of the present application. In an embodiment where the partition wall 82 forms the accommodating cavity 821, the opening 16 of the heat management component 9 entering the accommodating cavity 821 can be arranged on the outer surface of the wall of the housing 1 arranged opposite to the partition wall 82 along the first direction X.

[0402] An embodiment of the present application provides a battery 100, comprising a battery cell 10 provided in any one of the above embodiments.

[0403] An embodiment of the present application provides an electrical device, including a battery cell 10 provided in any one of the above embodiments, and the battery cell 10 is used to provide electrical energy.

[0404] An embodiment of the present application provides an energy storage device, comprising a battery cell 10 provided in any one of the above embodiments.

[0405] The energy storage device can be an energy storage container, an energy storage cabinet, etc.

[0406] According to some embodiments of the present application, see Figures 12 to 16As shown, the present application provides a battery cell 10, which 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 cover 12, one end of the shell 11 forms an opening, and the end cover 12 closes the opening. The electrode assembly 2 includes a main body 23, a first pole tab 21 and a second pole tab 22, along the first direction X, the first pole tab 21 and the second pole tab 22 are both arranged at the same end of the main body 23, and the first pole tabs 21 of the plurality of electrode assemblies 2 are located at the same end of the main body 23, and the second pole tabs 22 of the plurality of electrode assemblies 2 are located at the same end of the main body 23. A plurality of electrode assemblies 2 are arranged in the housing 1, and the plurality of electrode assemblies 2 are stacked along the second direction Y, and the end cover 12 is arranged on one side of the plurality of electrode assemblies 2 along the second direction Y. The first electrode terminal 3 and the second electrode terminal 4 are both disposed on the end cap 12, and the first electrode terminal 3 and the second electrode terminal 4 are arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The first current collecting member 5 and the second current collecting member 6 are both disposed in the housing 1, and the first current collecting member 5 and the second current collecting member 6 are arranged at intervals along the third direction Z. The first current collecting member 5 includes a first connecting portion 52 and a third connecting portion 54 connected to each other, the first connecting portion 52 is located on the side of the main body 23 provided with the first pole tab 21 in the first direction X, and the first connecting portion 52 is welded to the first pole tab 21 of the plurality of electrode assemblies 2, and the third connecting portion 54 is located between the end cap 12 and the plurality of electrode assemblies 2 in the second direction Y, and the surface of the third connecting portion 54 facing the end cap 12 is convexly provided with a first convex portion 53, and the first convex portion 53 is welded to the first electrode terminal 3 to electrically connect the first electrode terminal 3 and the plurality of electrode assemblies 2. The first connection portion 52 is provided with a first avoidance area 51, which penetrates the first connection portion 52 along the first direction X, and the first electrode tab 21 passes through the first avoidance area 51 and is connected to the side of the first connection portion 52 away from the main body 23. The first avoidance area 51 is a notch provided at the edge of the first connection portion 52 in the third direction Z. The second current collecting member 6 includes a second connection portion 62 and a fourth connection portion 64 connected to each other, the second connection portion 62 is located on the side of the main body 23 provided with the second electrode tab 22 in the first direction X, and the second connection portion 62 is welded to the second electrode tabs 22 of the plurality of electrode assemblies 2, the fourth connection portion 64 is located between the end cap 12 and the plurality of electrode assemblies 2 in the second direction Y, and the surface of the fourth connection portion 64 facing the end cap 12 is convexly provided with a second convex portion 63, and the second convex portion 63 is welded to the second electrode terminal 4 to electrically connect the second electrode terminal 4 and the plurality of electrode assemblies 2. The second connection portion 62 is provided with a second avoidance area 61 , which penetrates the second connection portion 62 along the first direction X. The second electrode tab 22 passes through the second avoidance area 61 and is connected to a side of the second connection portion 62 away from the main body 23 .The second avoidance area 61 is a notch provided at the edge of the second connection part 62 in the third direction Z. The first insulating member 71 is provided along the first direction X on the side of the first connection part 52 and the second connection part 62 away from the main body 23 to insulate and isolate the first connection part 52 from the shell 1 and the second connection part 62 from the shell 1. The second insulating member 72 is provided along the first direction X between the first connection part 52 and the second connection part 62 and the main body 23 to insulate and isolate the first connection part 52 from the main body 23 and the second connection part 62 from the main body 23. The third insulating member 73 is provided along the second direction Y between the third connection part 54 and the fourth connection part 64 and the plurality of electrode assemblies 2 to insulate and isolate the third connection part 54 from the electrode assembly 2 and the fourth connection part 64 from the electrode assembly 2. Along the second direction Y, a first slot 731 is provided on the side of the third insulating member 73 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 away from the electrode assembly 2, and the fourth connecting portion 64 is accommodated in the second slot 732 .

[0407] The housing 1 is in a rectangular shape, 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 a 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.

[0408] 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, and 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 arranged on the end cover 12 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 pole 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 pole 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 pole tab 21, and reducing the difficulty of assembling the second current collecting member 6 with the second electrode terminal 4 and the second pole tab 22, and can reduce the interference problem between the first electrode terminal 3 and the first pole tab 21 and between the second electrode terminal 4 and the second pole 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 beneficial 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.

[0409] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0410] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0411] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0412] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, It is characterized in that The battery comprises 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, It is characterized in that 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, It is characterized in that 400Ah≤C≤1500Ah,2.5dm 3 ≤V≤13.8dm 3 。 4. The battery cell according to claim 2, It is characterized in that 1500Ah<C≤3000Ah,9.6dm 3 ≤V≤27.6dm 3 。 5. The battery cell according to claim 2, It is characterized in that <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, It is characterized in that 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, It is characterized in that 400Ah≤C≤1500Ah,1.4dm 3 ≤V≤12.2dm 3 。 8. The battery cell according to claim 6, It is characterized in that 1500Ah<C≤3000Ah,6.2dm 3 ≤V≤24.4dm 3 。 9. The battery cell according to claim 6, It is characterized in that 3000Ah<C≤5000Ah,12.4dm 3 ≤V≤40.6dm 3 。 10. The battery cell according to claim 1, It is characterized in that The battery cell is a sodium battery, 3.5dm 3 ≤V≤65dm 3 .

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

15. The battery cell according to claim 1, It is characterized in that 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, It is characterized in that 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, It is characterized in that The first current collecting member is provided with a first avoidance area, the first avoidance area penetrates the first current collecting member along the 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, It is characterized in that 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 claim 15, It is characterized in that 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 claim 16, It is characterized in that 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, It is characterized in that 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, It is characterized in that The second avoidance area is a through hole provided on the second current collecting member; or, the second avoidance area is a notch provided on the edge of the second current collecting member.

23. The battery cell according to claim 20, It is characterized in that 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 claim 15, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 24, It is characterized in that 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 claim 24, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 24, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 15, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 34, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 34, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 claim 43, It is characterized in that 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, It is characterized in that 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 claim 43, It is characterized in that The subspace is formed inside the partitioning device.

49. The battery cell according to claim 48, It is characterized in that 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, It is characterized in that 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, It is characterized in that Comprising the battery cell according to any one of claims 1-50.

52. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 50, wherein the battery cell is used to provide electrical energy.

53. An energy storage device, It is characterized in that Comprising the battery cell according to any one of claims 1-50.

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