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

Abstract

The invention provides a battery monomer, a battery, a power utilization device and an energy storage cabinet, and belongs to the technical field of batteries. The battery monomer comprises a shell, a plurality of pole groups and a plurality of electrode terminals, the housing has a wall portion. The plurality of pole groups are accommodated in the shell and are arranged along the first direction, each pole group comprises a main body group and two pole lug groups, the two pole lug groups are arranged on one side of the main body group in the second direction at intervals along the first direction, and the polarities of the two pole lug groups are opposite. The plurality of electrode terminals are installed on the wall portion and arranged at intervals in the first direction. In the first direction, the polarities of the two close tab groups in the two adjacent pole groups are the same and are jointly and electrically connected with one electrode terminal, and the two farthest tab groups in the plurality of pole groups are electrically connected with the two electrode terminals respectively. Therefore, electrode terminals arranged on the shell can be saved, the production takt of the battery monomer can be optimized, the production efficiency of the battery monomer can be improved, and the manufacturing cost of the battery monomer can be reduced.

Description

Technical Field

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

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

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

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a plurality of pole groups and a plurality of electrode terminals; the shell has a wall portion; the plurality of pole groups are accommodated in the shell and arranged along a first direction, the pole groups comprising a main body group and two pole lug groups, the two pole lug groups are spaced apart along the first direction on one side of the main body group in a second direction, and the polarities of the two pole lug groups are opposite, and the second direction intersects with the first direction; the plurality of electrode terminals are mounted on the wall portion and spaced apart along the first direction; wherein, along the first direction, the polarities of two pole lug groups close to each other in two adjacent pole groups are the same and are electrically connected to one electrode terminal in common, and the two pole lug groups farthest apart in the plurality of pole groups are electrically connected to two electrode terminals respectively.

[0005] In the above technical solution, a plurality of pole groups arranged along a first direction are arranged in the outer shell of the battery cell, and each pole group includes a main body group and two pole ear groups with opposite polarities arranged on one side of the main body group at intervals along the first direction, so that the battery cell is provided with a plurality of electrode assemblies, which is beneficial to improve the capacity of the battery cell to realize a large-capacity battery cell. Among them, by setting two pole lug groups that are close to each other in the first direction in two adjacent pole groups to have the same polarity and be electrically connected to the same electrode terminal, and connecting the two pole lug groups that are farthest apart from each other in multiple pole groups to the two electrode terminals respectively, so that the two pole lug groups that are close to each other in two adjacent pole groups are electrically connected to one electrode terminal, the input or output of electric energy of the battery cell can be realized, so that the two pole lug groups that are close to each other in two adjacent pole groups can share one electrode terminal, so that the battery cell adopting this structure can save the electrode terminals set on the wall of the shell, so as to optimize the process of assembling the electrode terminals on the shell, and only one electrode terminal needs to be electrically connected to the two pole lug groups to complete the assembly process of the two pole lug groups, which is beneficial to optimizing the production rhythm of the battery cell, thereby effectively improving the production efficiency of the battery cell, and reducing the manufacturing cost of the battery cell.

[0006] In some embodiments, the battery cell further includes a plurality of current collecting components; the plurality of current collecting components are arranged in one-to-one correspondence with the plurality of electrode terminals, and the current collecting components are connected to the corresponding electrode terminals; wherein, along the first direction, two of the mutually adjacent pole lug groups in two adjacent pole groups are electrically connected to one of the current collecting components, and the two of the pole lug groups that are farthest apart in the plurality of pole groups are electrically connected to two of the current collecting components respectively.

[0007] In the above technical solution, the battery cell is also provided with a plurality of current collecting components corresponding to the electrode terminals, and the two pole lug groups farthest apart from each other in the plurality of pole groups are respectively connected to the two electrode terminals through two current collecting components, and the two pole lug groups close to each other along the first direction in the two adjacent pole groups are connected to the same electrode terminal through a current collecting component to realize the input or output of electric energy of the battery cell. The battery cell adopting such a structure can reduce the difficulty of assembling between the pole lug groups and the electrode terminals, especially the difficulty of assembling between the two pole lug groups close to each other in the two adjacent pole groups and the same electrode terminal, thereby helping to reduce the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0008] In some embodiments, a plurality of the current collecting components are disposed in the outer shell, and the plurality of current collecting components are arranged at intervals along the first direction; or, along the second direction, a side of the outer shell close to the pole tab group is provided with a channel for each pole tab group to extend out, and each pole tab group can extend out of the outer shell through the corresponding channel, and a plurality of the current collecting components are disposed outside the outer shell, and the current collecting components are electrically connected to the extended pole tab group.

[0009] In the above technical solution, by arranging multiple current collecting components in the shell, and the arrangement direction of the multiple current collecting components is the same as the arrangement direction of the multiple electrode terminals, on the one hand, the difficulty of assembling the tab group and the electrode terminal electrically connected to each other through the current collecting components can be reduced, which is conducive to improving the production efficiency of the battery cell, and on the other hand, the shell can play a certain protective role on the current collecting components to reduce the phenomenon of wear or damage of the current collecting components during use. By arranging the current collecting components outside the shell, and providing a hole for the tab group to pass through the shell, the tab group can be electrically connected to the electrode terminal through the current collecting components after passing through the shell. The battery cell adopting this structure is convenient for the later inspection of the current collecting components, and is convenient for the maintenance and replacement of the current collecting components, which is conducive to reducing the maintenance cost of the battery cell.

[0010] In some embodiments, the tab group includes a plurality of tabs spaced apart along a third direction, and the first direction, the second direction and the third direction are not coplanar and intersect in pairs; wherein, along the second direction, at least a portion of the current collecting component is located on a side of the main body group where the tab group is disposed, and a portion of the tab is located on a side of the current collecting component away from the main body group and is connected to the current collecting component.

[0011] In the above technical solution, the pole lug group includes a plurality of pole lugs arranged at intervals along the third direction, and the plurality of pole lugs are connected to the current collecting component to realize electrical connection between the pole group and the current collecting component, wherein, by arranging part of the pole lug to be located on the side of the current collecting component away from the main group in the second direction, and the part is connected to the current collecting component, so that the pole lug is a structure that bypasses the current collecting component and is connected to the side of the current collecting component away from the main group. On the one hand, the connection difficulty between the pole lug and the current collecting component can be reduced to improve the assembly efficiency between the pole lug and the current collecting component, and on the other hand, the phenomenon that the current collecting component presses the pole lug down in the direction close to the main group can be reduced to reduce the risk of short circuit caused by the pole lug being inserted upside down into the main group.

[0012] In some embodiments, a avoidance area is provided on the current collecting component, the avoidance area penetrates the current collecting component along the second direction, and the electrode tab passes through the avoidance area and is connected to a side of the current collecting component away from the main body group.

[0013] In the above technical solution, an avoidance zone is provided on the current collecting component, and the avoidance zone passes through both sides of the current collecting component along the second direction, so that multiple pole tabs of the pole tab group can pass through the avoidance zone and be connected to the side of the current collecting component away from the main group. The battery cell adopting this structure is convenient for arranging the pole tab to be connected to the side of the current collecting component away from the main group, which can reduce the difficulty of the pole tab bypassing the current collecting component and optimize the length of the pole tab bypassing the current collecting component, thereby alleviating the phenomenon of pole tab redundancy and reducing the manufacturing cost of the battery cell.

[0014] In some embodiments, the avoidance area is a through hole provided on the current collecting component; or, the avoidance area is a notch provided on the edge of the current collecting component in the first direction.

[0015] In the above technical solution, the avoidance area can be a through hole set on the current collecting component or a notch set at the edge of the current collecting component, so that the electrode ear can be connected to the side of the current collecting component away from the main group after passing through the avoidance area. The structure is simple and easy to manufacture.

[0016] In some embodiments, the plurality of current collecting components include at least one first current collecting component, and along the first direction, two of the pole lug groups close to each other in two adjacent pole groups are connected to one of the first current collecting components; wherein the first current collecting component is provided with two rows of avoidance areas arranged at intervals along the first direction, and each row of the avoidance areas is used for allowing multiple pole lugs of one pole lug group to pass through.

[0017] In the above technical solution, two rows of avoidance areas arranged along the first direction are provided on the first current collecting component, and the two rows of avoidance areas are respectively provided for multiple pole tabs of the two pole tab groups to pass through, so that the pole tabs of the two pole tab groups close to each other in the two adjacent pole groups are connected to the side of the first current collecting component away from the main group, which is helpful to reduce the difficulty of assembling the battery cell and can reduce the interference effect between the two pole tab groups.

[0018] In some embodiments, the plurality of current collecting members include two second current collecting members, and along the first direction, the first current collecting member is located between the two second current collecting members; wherein, along the first direction, the two second current collecting members are respectively connected to the two electrode lug groups farthest apart among the plurality of electrode groups.

[0019] In the above technical solution, the multiple current collecting components also include two second current collecting components, and the first current collecting component is arranged between the two second current collecting components in the first direction, so that the first current collecting component and the second current collecting component are arranged along the first direction and the two second current collecting components are respectively located on both sides, so that it is convenient for the two pole ear groups farthest apart in the multiple pole groups to be connected to the two second current collecting components respectively, which is beneficial to reduce the difficulty of assembling the battery monomer.

[0020] In some embodiments, along the second direction, the wall portion is located on one side of the plurality of pole groups, the pole tab group is disposed on a side of the main body group facing the wall portion, and the current collecting member is disposed on a side of the main body group facing the wall portion.

[0021] In the above technical solution, by setting the wall portion to be located on the side of the electrode group provided with the pole lug group in the second direction, and the current collecting component is set on the side of the main body group facing the wall portion, it is convenient for the current collecting component to connect the pole lug group and the electrode terminal arranged on the wall portion, and the current collecting component can be set as a whole on the side of the main body group facing the wall portion, which is beneficial to saving the space occupied by the current collecting component and improving the energy density of the battery cell.

[0022] In some embodiments, along the second direction, a protrusion is provided on a side of the current collecting member facing the wall portion, and the protrusion is connected to the electrode terminal.

[0023] In the above technical solution, a protrusion is provided on one side of the current collecting component facing the wall portion along the second direction, so that the current collecting component can be connected to the electrode terminal through the protrusion to achieve electrical connection between the current collecting component and the electrode terminal. The current collecting component adopting such a structure can reduce the difficulty of assembling the current collecting component and the electrode terminal, and the structure in which the protrusion is connected to the electrode terminal can improve the connection reliability between the current collecting component and the electrode terminal.

[0024] In some embodiments, along the third direction, the wall portion is located on one side of the plurality of the pole groups, and the first direction, the second direction and the third direction are not coplanar and intersect each other; wherein the current collecting member includes a first connection portion and a second connection portion that are connected to each other, and along the third direction, the first connection portion is located on a side of the plurality of the pole groups facing the wall portion, and the first connection portion is connected to the electrode terminal, and along the second direction, the second connection portion is located on a side of the main body group where the pole lug group is provided, and the second connection portion is connected to the pole lug group.

[0025] In the above technical solution, the wall portion of the shell is located on one side of the plurality of pole groups in the third direction, and the current collecting member includes a first connecting portion located on the side of the plurality of pole groups facing the wall portion in the third direction and a second connecting portion located on the side of the main body group where the pole lug group is provided in the second direction. By connecting the first connecting portion to the electrode terminal provided on the wall portion and connecting the second connecting portion to the pole lug group, the pole lug group is electrically connected to the electrode terminal through the current collecting member. The battery cell adopting this structure can, on the one hand, separate the area of ​​the shell where the electrode terminal is provided and the area of ​​the main body group where the pole lug group is provided, so that the area of ​​the shell facing the side of the main body group where the pole lug group is provided is not Electrode terminals are provided to facilitate stacking of multiple battery cells along the second direction. On the other hand, the area where the current collecting member is connected to the electrode terminal and the area where the current collecting member is connected to the tab group can be separated from each other, which is beneficial to reducing the difficulty of assembling the current collecting member, the electrode terminal and the tab group, and can reduce the interference between the electrode terminal and the tab group, especially when the electrode terminal and the tab group are welded to the current collecting member, the mutual influence between the welding molten pool of the electrode terminal and the current collecting member and the welding molten pool of the tab group and the current collecting member can be effectively reduced, which is beneficial to improving the assembly quality and stability of the electrode terminal and the tab group connected to the current collecting member.

[0026] In some embodiments, along the third direction, a protrusion is provided on a side of the first connection portion facing the wall portion, and the protrusion is connected to the electrode terminal.

[0027] In the above technical solution, a protrusion is provided on the side of the first connection portion of the current collecting component facing the wall portion, so that the first connection portion of the current collecting component can be connected to the electrode terminal through the protrusion to achieve electrical connection between the current collecting component and the electrode terminal. The current collecting component adopting such a structure can reduce the difficulty of assembling the first connection portion of the current collecting component and the electrode terminal, and the structure in which the protrusion is connected to the electrode terminal can improve the connection reliability between the first connection portion of the current collecting component and the electrode terminal.

[0028] In some embodiments, a buffer is disposed between two adjacent pole groups along the first direction.

[0029] In the above technical solution, a buffer is provided between two adjacent pole groups so that the buffer can play a buffering role between the two adjacent pole groups, so that the buffer can absorb the expansion force and collision force between the pole groups, thereby effectively alleviating the collision phenomenon between the two adjacent pole groups, and effectively alleviating the extrusion phenomenon caused by the mutual expansion of the two adjacent pole groups, thereby effectively improving the reliability and service life of the battery cell.

[0030] In some embodiments, the main body group includes N main body parts stacked along a third direction, and the pole ear group includes a plurality of pole ears arranged at intervals along the third direction, the pole ears correspond to the main body parts one by one, and the pole ears are connected to one end of the main body part in the second direction, and the first direction, the second direction and the third direction are not coplanar and intersect each other, satisfying that N≥4.

[0031] In the above technical solution, the number of the main parts of the main body group of the electrode group stacked in the third direction is set to be greater than or equal to 4, so as to increase the number of electrode assemblies stacked in the third direction of the electrode group, thereby enabling large-capacity battery cells to be achieved. Large-capacity battery cells can be achieved without increasing the winding size or stacking size of a single electrode assembly, which is beneficial to reducing the manufacturing difficulty and manufacturing cost of a single electrode assembly.

[0032] In some embodiments, the shell is in a rectangular parallelepiped shape, and along the second direction, the shell has two opposite first outer surfaces, and the first outer surface is the outer surface with the largest area in the shell.

[0033] In the above technical solution, by setting the outer shell of the battery cell to a rectangular structure, and the first outer surface of the outer shell in the second direction being the surface with the largest area among the outer surfaces of the outer shell, the tab group is arranged on the side of the main body group facing the largest wall of the outer shell, thereby facilitating the assembly of the tab group with other components and facilitating subsequent maintenance of the tab group.

[0034] In some embodiments, the outer shell includes a shell and an end cover; the interior of the shell forms a accommodating cavity with an opening, and the accommodating cavity is used to accommodate the pole group; the end cover closes the opening; wherein the end cover is the wall portion; or, the shell includes the wall portion.

[0035] In the above technical solution, by setting the wall of the shell as the end cap of the shell for closing the opening, the battery cell with this structure is easy to assemble the electrode terminal on the end cap, which is conducive to reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell. By setting the wall of the shell as a wall of the shell, the battery cell with this structure can make the area of ​​the shell where the electrode terminal is installed away from the end cap, thereby alleviating the phenomenon that the force generated by the pulling or twisting of the wall by the electrode terminal and other components directly acts on the end cap, which is conducive to reducing the risk of connection failure between the end cap and the shell, and further can effectively reduce the risk of leakage of the battery cell during use.

[0036] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0037] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy.

[0038] In a fourth aspect, an embodiment of the present application further provides an energy storage cabinet comprising a plurality of the above-mentioned battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0044] Figure 5 A schematic diagram of the structure of an electrode assembly of an electrode group of a battery cell provided in some embodiments of the present application;

[0045] Figure 6 A schematic diagram of the assembly of a pole group and a current collecting member provided in some embodiments of the present application;

[0046] Figure 7 A schematic structural diagram of a second current collecting member of a battery cell provided in some embodiments of the present application;

[0047] Figure 8 A schematic diagram of the structure of the second current collecting member of the battery cell provided in some embodiments of the present application in other embodiments;

[0048] Fig. 9 A schematic structural diagram of a first current collecting member of a battery cell provided in some embodiments of the present application;

[0049] Fig.10 A schematic diagram of the structure of a battery cell provided in some other embodiments of the present application;

[0050] Fig.11 An exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0051] Fig.12 A schematic structural diagram of a first current collecting member of a battery cell provided in some other embodiments of the present application;

[0052] Fig.13 A schematic structural diagram of a second current collecting member of a battery cell provided in some other embodiments of the present application;

[0053] Fig.14 Schematic diagram of the structure of the second current collecting member of the battery cell provided in other embodiments of the present application.

[0054] Icons: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell; 21-casing; 211-wall; 212-shell; 2121-opening; 213-end cap; 22-pole group; 221-main body group; 222-ear group; 223-electrode assembly; 2231-main body; 2232-ear; 23-electrode terminal; 24-current collecting member; 241-avoidance area; 242-protrusion; 243-first connecting portion; 244-second connecting portion; 25-first current collecting member; 26-second current collecting member; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] 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.

[0060] 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.

[0061] The term "plurality" used in the present application refers to two or more (including two).

[0062] 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.

[0063] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0064] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0065] 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.

[0066] 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.

[0067] 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.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 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 0.25Mn 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.

[0069] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0070] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0071] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0077] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0084] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0085] 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.

[0086] 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.

[0087] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0088] 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.

[0089] In some embodiments, the electrode assembly is a laminate structure.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In some embodiments, the shape of the electrode assembly can be flat or polygonal.

[0096] 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.

[0097] 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.

[0098] As an example, the battery cell may be a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0104] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, capacity, charge and discharge rate and other performance parameters.

[0105] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell, the electrode assembly includes a main body and two pole ears connected to one end of the main body, the two pole ears have opposite polarities, so that the two pole ears output or input the positive and negative electrodes of the electrode assembly respectively. As the demand for the capacity of the battery cell becomes higher and higher, in large-capacity battery cells in the related art, in order to increase the capacity of the battery cell, a plurality of electrode assemblies are usually stacked in the shell of the battery cell, and the plurality of electrode assemblies are arranged in an array to increase the capacity of the electrode assembly. However, when the pole ears of multiple rows of electrode assemblies are assembled with electrode terminals to realize the output or input of electrical energy of the battery cell, the pole ears of the multiple rows of electrode assemblies need to be electrically connected with the corresponding electrode terminals, which makes the assembly more difficult and the assembly processes more numerous, which is not conducive to optimizing the production rhythm of the battery cell, resulting in low production efficiency of the battery cell and high manufacturing cost.

[0106] Based on the above considerations, in order to solve the problem of low production efficiency and high production cost of battery cells, an embodiment of the present application provides a battery cell, which includes a shell, a plurality of pole groups and a plurality of electrode terminals. The shell has a wall portion. The plurality of pole groups are accommodated in the shell and arranged along a first direction, and the pole group includes a main body group and two pole lug groups, and the two pole lug groups are spaced along the first direction on one side of the main body group in the second direction, and the polarities of the two pole lug groups are opposite, and the second direction intersects with the first direction. A plurality of electrode terminals are mounted on the wall portion and spaced along the first direction. Along the first direction, the polarities of the two pole lug groups close to each other in two adjacent pole groups are the same and are electrically connected to one electrode terminal in common, and the two pole lug groups farthest apart in the plurality of pole groups are electrically connected to the two electrode terminals respectively.

[0107] In a battery cell of this structure, a plurality of electrode groups arranged along a first direction are arranged in the outer shell of the battery cell, and each electrode group includes a main body group and two electrode ear groups with opposite polarities arranged on one side of the main body group at intervals along the first direction, so that the battery cell is provided with a plurality of electrode assemblies, which is beneficial to improve the capacity of the battery cell to realize a large-capacity battery cell. Among them, by setting two pole lug groups that are close to each other in the first direction in two adjacent pole groups to have the same polarity and be electrically connected to the same electrode terminal, and connecting the two pole lug groups that are farthest apart from each other in multiple pole groups to the two electrode terminals respectively, so that the two pole lug groups that are close to each other in two adjacent pole groups are electrically connected to one electrode terminal, the input or output of electric energy of the battery cell can be realized, so that the two pole lug groups that are close to each other in two adjacent pole groups can share one electrode terminal, so that the battery cell adopting this structure can save the electrode terminals set on the wall of the shell, so as to optimize the process of assembling the electrode terminals on the shell, and only one electrode terminal needs to be electrically connected to the two pole lug groups to complete the assembly process of the two pole lug groups, which is beneficial to optimizing the production rhythm of the battery cell, thereby effectively improving the production efficiency of the battery cell, and reducing the manufacturing cost of the battery cell.

[0108] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of more assembly processes of the battery cells, thereby improving the production efficiency of the battery cells and reducing the manufacturing cost of the battery cells.

[0109] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0110] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0111] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0112] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0113] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application is as follows. The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0114] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0115] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0116] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0117] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, and the busbar component is used to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0118] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a prism or other shapes. Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0119] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 and Figure 5 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A schematic diagram of the structure of the electrode assembly 223 of the electrode group 22 of the battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a shell 21, a plurality of electrode groups 22 and a plurality of electrode terminals 23. The shell 21 has a wall portion 211. The plurality of electrode groups 22 are accommodated in the shell 21 and arranged along the first direction X. The electrode group 22 includes a main body group 221 and two pole ear groups 222. The two pole ear groups 222 are arranged at intervals along the first direction X on one side of the main body group 221 in the second direction Y, and the polarities of the two pole ear groups 222 are opposite, and the second direction Y intersects with the first direction X. A plurality of electrode terminals 23 are installed on the wall portion 211 and are arranged at intervals along the first direction X. Along the first direction X, the polarities of the two pole ear groups 222 close to each other in two adjacent pole groups 22 are the same and are electrically connected to one electrode terminal 23 in common, and the two pole ear groups 222 farthest apart in the plurality of pole groups 22 are electrically connected to the two electrode terminals 23 respectively.

[0120] The housing 21 may also be used to contain electrolytes, such as electrolytes, etc. The housing 21 may also be made of a variety of materials, such as copper, iron, aluminum, steel or aluminum alloys, etc.

[0121] In some embodiments, the housing 21 may include a shell 212 and an end cover 213, wherein a receiving cavity is formed inside the shell 212, and the receiving cavity is used to receive the electrode group 22, and the receiving cavity has an opening 2121, that is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for receiving the electrode group 22 and the electrolyte.

[0122] When assembling the battery cell 20 , the plurality of electrode groups 22 may be placed into the housing 212 , and the housing 212 may be filled with electrolyte. The end cap 213 may then be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0123] The shell 212 can be in various shapes, such as a rectangular parallelepiped or prism structure. The shape of the shell 212 can be determined according to the specific shape of the pole group 22. For example, if the pole group 22 is a rectangular parallelepiped structure, a shell 212 with a rectangular parallelepiped structure can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4 In the embodiment, the shell 212 is a rectangular parallelepiped structure, and the end cover 213 is a plate-like structure.

[0124] It should be noted that the wall portion 211 for mounting the electrode terminal 23 may be an end cover 213 of the housing 21 or a wall of the housing 212. Figure 3 and Figure 4 In the figure, the wall portion 211 is the end cover 213 of the outer shell 21. Of course, in some embodiments, the wall portion 211 can also be the bottom wall of the shell 212 of the outer shell 21 and the end cover 213 arranged opposite to each other, or the side wall of the shell 212 of the outer shell 21 and the end cover 213 connected and adjacent to each other.

[0125] Of course, it is understandable that the shell 21 is not limited to the above structure, and the shell 21 may also be other structures. For example, the shell 21 may include a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode group 22 and the electrolyte. That is, the shell 212 is formed with openings 2121 on opposite sides, and the two end covers 213 are respectively covered on both sides of the shell 212 to close the corresponding openings 2121.

[0126] It should be noted that see Figure 4and Figure 5 As shown, the electrode group 22 arranged in the battery cell 20 is formed by stacking a plurality of electrode assemblies 223, and the plurality of electrode assemblies 223 are stacked along the third direction Z, that is, the electrode group 22 includes a plurality of electrode assemblies 223, and the plurality of electrode assemblies 223 are stacked along the third direction Z, wherein each electrode assembly 223 includes a main body 2231 and two pole ears 2232 with opposite polarities, that is, the two pole ears 2232 of each electrode assembly 223 are respectively used to output the positive electrode and the negative electrode of the electrode assembly 223, and the two pole ears 2232 are both arranged at the same end of the main body 2231 in the second direction Y, and the plurality of electrode assemblies 223 are stacked along the third direction Z. The main body 2231 of the component 223 is stacked along the third direction Z to form the main body group 221 of the electrode group 22, that is, the main body group 221 includes a plurality of main bodies 2231 stacked along the third direction Z, and the two pole ears 2232 of the plurality of electrode components 223 respectively form two pole ear groups 222 of the electrode group 22, so that the polarities of the two pole ear groups 222 are opposite, that is, each pole ear group 222 includes a plurality of pole ears 2232 arranged along the third direction Z, and the polarities of the plurality of pole ears 2232 in each pole ear group 222 are the same. Exemplarily, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0127] The electrode assembly 223 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 223 can be various. For example, the electrode assembly 223 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet. The main body 2231 of the electrode assembly 223 is the area where the electrode assembly 223 chemically reacts in the battery cell 20. The main body 2231 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the separator and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet of opposite polarity.

[0128] The tab 2232 is the positive electrode or negative electrode of the electrode assembly 223, and is used to output or input the positive electrode or negative electrode of the electrode assembly 223. If the tab 2232 is the positive electrode of the electrode assembly 223, the tab 2232 is a component formed by the regions on the positive electrode sheet that are not coated with the positive electrode active material layer being stacked and connected to each other; if the tab 2232 is the negative electrode of the electrode assembly 223, the tab 2232 is a component formed by the regions on the negative electrode sheet that are not coated with the negative electrode active material layer being stacked and connected to each other.

[0129] Exemplarily, the isolation member is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0130] Multiple electrode groups 22 are arranged along the first direction X, that is, the battery cell 20 contains multiple rows of electrode assemblies 223 arranged along the first direction X, and each row of electrode assemblies 223 includes multiple electrode assemblies 223 stacked along the third direction Z, so that the multiple electrode assemblies 223 are arranged in an arranged manner in the outer shell 21, and correspondingly, each row of electrode assemblies 223 is a electrode group 22.

[0131] For example, in Figure 4 In the embodiment, two pole groups 22 arranged along a first direction X are arranged in the outer shell 21, and each pole group 22 includes a plurality of electrode assemblies 223 stacked along a third direction Z. Of course, in other embodiments, the number of pole groups 22 arranged in the outer shell 21 may also be three, four, five or six, etc.

[0132] Along the first direction X, the polarities of the two adjacent pole lug groups 222 in the two adjacent pole groups 22 are the same and are electrically connected to one electrode terminal 23. That is, in each of the two adjacent pole groups 22, the two pole groups 22 jointly include four pole lug groups 222 arranged along the first direction X, and the polarities of the two pole lug groups 222 in the middle of the four pole lug groups 222 are the same and are electrically connected to the same electrode terminal 23. For example, in the four pole lug groups 222 of the two adjacent pole groups 22, the two pole lug groups 222 in the middle may be both positive poles, and the two pole lug groups 222 on both sides may be both negative poles. That is, in each of the two adjacent pole groups 22, the polarities of the four pole lug groups 222 arranged along the first direction X are negative pole, positive pole, positive pole and negative pole, respectively. Of course, among the four pole ear groups 222 of two adjacent pole groups 22, the two pole ear groups 222 located in the middle may both be negative poles, and the two pole ear groups 222 located on both sides may both be positive poles. That is to say, in each two adjacent pole groups 22, the polarities of the four pole ear groups 222 arranged along the first direction X are positive pole, negative pole, negative pole and positive pole respectively.

[0133] Along the first direction X, the two pole lug groups 222 that are farthest apart from each other among the multiple pole groups 22 are electrically connected to the two electrode terminals 23, respectively. That is, among the multiple pole groups 22, the multiple pole groups 22 together include multiple pole lug groups 222 arranged along the first direction X, and the two outermost pole lug groups 222 among the multiple pole lug groups 222 are connected to the two electrode terminals 23, respectively.

[0134] For example, in Figure 4In the embodiment, two electrode groups 22 arranged along the first direction X are arranged in the outer shell 21, and the polarity of the two adjacent electrode ear groups 222 of the two electrode groups 22 is the same, and they share an electrode terminal 23, and the polarity of the two outermost electrode ear groups 222 of the two electrode groups 22 is the same, and they are respectively connected to the two electrode terminals 23, so that only three electrode terminals 23 arranged at intervals along the first direction X are arranged on the wall portion 211, and there is no need to set an electrode terminal 23 for each electrode ear group 222.

[0135] The electrode terminal 23 serves to output or input the electric energy of the battery cell 20 , and its material may be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0136] For example, in Figure 3 and Figure 4 In the embodiment, two pole groups 22 arranged along a first direction X are arranged in the outer shell 21, and correspondingly, three electrode terminals 23 are arranged on the wall portion 211, and the three electrode terminals 23 are arranged at intervals along the first direction X. The polarities of two adjacent pole ear groups 222 in the two pole groups 22 are the same and are both electrically connected to an electrode terminal 23 located in the middle of the three electrode terminals 23, and the two outermost pole ear groups 222 in the two pole groups 22 are electrically connected to the other two electrode terminals 23, respectively, to realize the input or output of electrical energy of the battery cell 20.

[0137] It should be noted that the multiple pole tabs 2232 of the pole tab group 222 and the electrode terminal 23 can be directly connected, for example, by abutting each other or welding, etc., to achieve electrical connection between the pole tab group 222 and the electrode terminal 23. Of course, the multiple pole tabs 2232 of the pole tab group 222 and the electrode terminal 23 can be indirectly connected, that is, the multiple pole tabs 2232 of the pole tab group 222 are interconnected with other components, and then connected to the electrode terminal 23 through other components.

[0138] Optionally, multiple electrode terminals 23 are all insulated and installed on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 23 and the wall portion 211. Of course, in other embodiments, one electrode terminal 23 among the multiple electrode terminals 23 may be directly installed on the wall portion 211, so that the wall portion 211 is electrically connected to the electrode terminal 23. At this time, the wall portion 211 and the electrode terminal 23 carry the same charge, and the remaining electrode terminals 23 are all insulated and installed on the wall portion 211.

[0139] Exemplarily, an assembly hole may be provided on the wall portion 211 , and the assembly hole penetrates through both sides of the wall portion 211 along the thickness direction of the wall portion 211 , and the electrode terminal 23 is inserted into the assembly hole.

[0140] The battery cell 20 may further include an insulating member, which is disposed between the wall portion 211 and the electrode terminal 23 to insulate and isolate the wall portion 211 and the electrode terminal 23 , thereby achieving an insulated installation of the electrode terminal 23 on the wall portion 211 .

[0141] Exemplarily, the insulating member may be made of rubber, plastic, or silicone.

[0142] In some embodiments, the battery cell 20 may further include a pressure relief mechanism disposed on the housing 21 , and configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0143] Optionally, the pressure relief mechanism may be disposed on the end cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21. Similarly, the pressure relief mechanism and the housing 21 may be an integrally formed structure, or may be a separately provided structure. If the pressure relief mechanism and the housing 21 are an integrally formed structure, the pressure relief mechanism is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notched groove is provided. If the pressure relief mechanism and the housing 21 are a separate structure, the pressure relief mechanism may be connected to the housing 21 by welding or the like, and correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.

[0144] A plurality of electrode groups 22 arranged along a first direction X are arranged in the outer shell 21 of the battery cell 20, and each electrode group 22 includes a main body group 221 and two electrode ear groups 222 with opposite polarities arranged on one side of the main body group 221 at intervals along the first direction X, so that the battery cell 20 is provided with a plurality of electrode assemblies 223, which is beneficial to improve the capacity of the battery cell 20, so as to realize a large-capacity battery cell 20. Among them, by setting two pole lug groups 222 that are close to each other in the first direction X in two adjacent pole groups 22 to have the same polarity and be electrically connected to the same electrode terminal 23, and connecting the two pole lug groups 222 that are farthest apart in the multiple pole groups 22 to two electrode terminals 23 respectively, so that the two pole lug groups 222 that are close to each other in two adjacent pole groups 22 are electrically connected to one electrode terminal 23, the input or output of electric energy of the battery cell 20 can be realized, so that the two pole lug groups 222 that are close to each other in two adjacent pole groups 22 can share one electrode terminal 23, so that the battery cell 20 adopting this structure can save the electrode terminal 23 set on the wall 211 of the shell 21, so as to optimize the process of assembling the electrode terminal 23 on the shell 21, and only one electrode terminal 23 needs to be electrically connected to the two pole lug groups 222 to complete the assembly process of the two pole lug groups 222, which is beneficial to optimizing the production rhythm of the battery cell 20, thereby effectively improving the production efficiency of the battery cell 20, and reducing the manufacturing cost of the battery cell 20.

[0145] According to some embodiments of the present application, see Figure 4 As shown, the battery cell 20 may further include a plurality of current collecting members 24, and the plurality of current collecting members 24 are arranged in one-to-one correspondence with the plurality of electrode terminals 23, and the current collecting members 24 are connected to the corresponding electrode terminals 23. Along the first direction X, two electrode tab groups 222 close to each other in two adjacent electrode groups 22 are electrically connected to one current collecting member 24, and two electrode tab groups 222 farthest apart in the plurality of electrode groups 22 are electrically connected to two current collecting members 24, respectively.

[0146] Among them, multiple current collecting components 24 are arranged in one-to-one correspondence with multiple electrode terminals 23, that is, each current collecting component 24 is connected to one electrode terminal 23, and the number and arrangement direction of the current collecting components 24 are the same as the number and arrangement direction of the electrode terminals 23.

[0147] Exemplarily, the current collecting member 24 is connected to the electrode terminal 23 by welding. Of course, in other embodiments, the current collecting member 24 may also be abutted or clamped to the electrode terminal 23 .

[0148] Two pole lug groups 222 close to each other in two adjacent pole groups 22 are electrically connected to a current collecting component 24. That is, in each two adjacent pole groups 22, the two pole groups 22 together include four pole lug groups 222 arranged along the first direction X. The two pole lug groups 222 located in the middle of the four pole lug groups 222 have the same polarity and are connected to an electrode terminal 23 through the same current collecting component 24.

[0149] The two pole lug groups 222 that are farthest apart from each other among the multiple pole groups 22 are electrically connected to the two current collecting components 24, respectively. That is, among the multiple pole groups 22, the multiple pole groups 22 together include a plurality of pole lug groups 222 arranged along the first direction X, and the two outermost pole lug groups 222 among the multiple pole lug groups 222 are connected to the two electrode terminals 23 through the two current collecting components 24, respectively.

[0150] Illustratively, the tabs 2232 of the tab group 222 are connected to the current collecting member 24 by welding. Of course, in other embodiments, the tabs 2232 of the tab group 222 may also be abutted against, screwed to, or the like with the current collecting member 24 .

[0151] It should be noted that the current collecting component 24 of the battery cell 20 can be arranged inside the outer shell 21, so that the tab group 222 is connected to the current collecting component 24 inside the outer shell 21. Of course, the current collecting component 24 of the battery cell 20 can also be arranged outside the outer shell 21, so that the tab group 222 is connected to the current collecting component 24 outside the outer shell 21.

[0152] The battery cell 20 is also provided with a plurality of current collecting components 24 corresponding to the electrode terminals 23. The two pole lug groups 222 that are farthest apart from each other in the plurality of pole groups 22 are respectively connected to the two electrode terminals 23 through two current collecting components 24, and the two pole lug groups 222 that are close to each other along the first direction X in two adjacent pole groups 22 are connected to the same electrode terminal 23 through a current collecting component 24 to realize the input or output of electric energy of the battery cell 20. The battery cell 20 adopting such a structure can reduce the difficulty of assembling between the pole lug group 222 and the electrode terminal 23, especially the difficulty of assembling between the two pole lug groups 222 that are close to each other in two adjacent pole groups 22 and the same electrode terminal 23, thereby helping to reduce the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0153] In some embodiments, see Figure 4 As shown, the multiple current collecting members 24 are all disposed in the housing 21 , and the multiple current collecting members 24 are arranged at intervals along the first direction X. That is, the current collecting members 24 are disposed between the main body group 221 of the electrode group 22 and the housing 21 .

[0154] By disposing multiple current collecting components 24 in the outer shell 21, and the arrangement direction of the multiple current collecting components 24 is the same as the arrangement direction of the multiple electrode terminals 23, on the one hand, the difficulty of assembling the tab group 222 and the electrode terminal 23 electrically connected to each other through the current collecting components 24 can be reduced, which is beneficial to improving the production efficiency of the battery cell 20. On the other hand, the outer shell 21 can play a certain protective role on the current collecting components 24, so as to reduce the wear or damage of the current collecting components 24 during use.

[0155] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also be other structures. For example, along the second direction Y, a side of the outer shell 21 close to the pole lug group 222 is provided with a channel for each pole lug group 222 to extend out, and each pole lug group 222 can extend out of the outer shell 21 through the corresponding channel. A plurality of current collecting components 24 are all provided on the outside of the outer shell 21, and the current collecting components 24 are electrically connected to the extended pole lug group 222.

[0156] Among them, along the second direction Y, a side of the outer shell 21 close to the pole lug group 222 is provided with a channel for each pole lug group 222 to extend out, that is, the area of ​​the outer shell 21 facing the side of the main body group 221 provided with the pole lug group 222 in the second direction Y is provided with a channel for the pole lug group 222 to pass through, so that the pole lug 2232 of the pole lug group 222 can extend out of the outer shell 21 and then be connected to the current collecting component 24 located outside the outer shell 21, and the current collecting component 24 is connected to the electrode terminal 23 outside the outer shell 21.

[0157] Exemplarily, the pole lug group 222 includes a plurality of pole lugs 2232 arranged along a third direction Z. One hole may be provided for each pole lug group 222 so that the plurality of pole lugs 2232 of one pole lug group 222 all extend out of the housing 21 through one hole. Alternatively, a plurality of holes may be provided for the plurality of pole lugs 2232 of each pole lug group 222 so that each pole lug 2232 can extend out of the housing 21 through one hole, which is beneficial to reduce interference effects between the plurality of pole lugs 2232.

[0158] By arranging the current collecting component 24 on the outside of the shell 21 and providing a hole on the shell 21 for the tab group 222 to pass through, the tab group 222 can be electrically connected to the electrode terminal 23 through the current collecting component 24 after passing through the shell 21. The battery cell 20 adopting this structure is convenient for later inspection of the current collecting component 24, and is convenient for maintenance and replacement of the current collecting component 24, which is beneficial to reducing the maintenance cost of the battery cell 20.

[0159] According to some embodiments of the present application, referring to Figure 4 and Figure 5 , and please refer to Figure 6 and Figure 7 , Figure 6 Schematic diagram of assembly of the electrode group 22 and the current collecting member 24 provided in some embodiments of the present application, Figure 7 A schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided in some embodiments of the present application. The tab group 222 includes a plurality of tabs 2232 arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. Along the second direction Y, at least part of the current collecting member 24 is located on the side of the main body group 221 where the tab group 222 is provided, and part of the tab 2232 is located on the side of the current collecting member 24 away from the main body group 221 and connected to the current collecting member 24.

[0160] The tab group 222 includes a plurality of tabs 2232 spaced apart along the third direction Z, that is, the tab group 222 includes a plurality of tabs 2232 stacked along the third direction Z and having the same polarity and spaced apart along the third direction.

[0161] The first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other, that is, the first direction X, the second direction Y and the third direction Z are all intersected each other, and every two directions form a plane, so that the three planes formed by the three directions are not coplanar. Exemplarily, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0162] At least part of the current collecting member 24 is located on the side of the main body group 221 where the tab group 222 is provided, that is, the current collecting member 24 may be entirely located on the side of the main body group 221 where the tab group 222 is provided, or may be only partially located on the side of the main body group 221 where the tab group 222 is provided. Of course, in the structure where at least part of the current collecting member 24 is located on the side of the main body group 221 where the tab group 222 is provided, the current collecting member 24 may be located inside the housing 21, or may be located outside the housing 21.

[0163] The portion of the pole ear 2232 is located at the side of the current collecting member 24 away from the main body group 221 and connected to the current collecting member 24, that is, the pole ear 2232 is connected to the side of the current collecting member 24 away from the main body group 221. Optionally, the structure in which the portion of the pole ear 2232 is located at the side of the current collecting member 24 away from the main body group 221 and connected to the current collecting member 24 can be various, for example, the pole ear 2232 can be a structure in which the pole ear 2232 passes around the edge of the current collecting member 24 from the side facing the main body group 221 and is connected to the side of the current collecting member 24 away from the main body group 221, or a channel for the pole ear 2232 to pass through is provided on the current collecting member 24, so that the pole ear 2232 passes through the current collecting member 24 and then is connected to the side of the current collecting member 24 away from the main body group 221.

[0164] The pole lug group 222 includes a plurality of pole lugs 2232 arranged at intervals along the third direction Z, and the plurality of pole lugs 2232 are all connected to the current collecting component 24 to achieve electrical connection between the pole group 22 and the current collecting component 24, wherein, by setting a portion of the pole lug 2232 to be located on the side of the current collecting component 24 away from the main group 221 in the second direction Y, and the portion is connected to the current collecting component 24, the pole lug 2232 is a structure that bypasses the current collecting component 24 and is connected to the side of the current collecting component 24 away from the main group 221. On the one hand, the connection difficulty between the pole lug 2232 and the current collecting component 24 can be reduced to improve the assembly efficiency between the pole lug 2232 and the current collecting component 24. On the other hand, the phenomenon that the current collecting component 24 presses the pole lug 2232 in the direction close to the main group 221 can be reduced to reduce the risk of short circuit caused by the pole lug 2232 being inserted upside down into the main group 221.

[0165] According to some embodiments of the present application, see Figure 4 , Figure 6 and Figure 7 As shown, a avoidance area 241 is provided on the current collecting member 24 , and the avoidance area 241 penetrates the current collecting member 24 along the second direction Y. The tab 2232 passes through the avoidance area 241 and is connected to a side of the current collecting member 24 away from the main body assembly 221 .

[0166] The avoidance area 241 penetrates the current collecting member 24 along the second direction Y, that is, the avoidance area 241 penetrates the surfaces of both sides of the current collecting member 24 in the second direction Y.

[0167] Optionally, there may be various structures of the avoidance area 241 provided on the current collecting component 24. There may be only one avoidance area 241 provided on the current collecting component 24, so that the multiple pole ears 2232 of the pole ear group 222 all pass through the current collecting component 24 through the same avoidance area 241 and then are connected to the side of the current collecting component 24 away from the main body group 221. There may also be one avoidance area 241 provided on the current collecting component 24 for each pole ear 2232. There may also be multiple avoidance areas 241 provided on the current collecting component 24, and each avoidance area 241 can allow one pole ear 2232 or multiple pole ears 2232 to pass through.

[0168] Exemplarily, a row of avoidance areas 241 is provided on the current collecting component 24 corresponding to a pole lug group 222, and each row of avoidance areas 241 includes a plurality of avoidance areas 241 arranged at intervals along the third direction Z. Two adjacent pole lugs 2232 among the plurality of pole lugs 2232 of the pole lug group 222 pass through the current collecting component 24 through a avoidance area 241 and are connected to the side of the current collecting component 24 away from the main group 221.

[0169] By setting an avoidance area 241 on the current collecting component 24, and the avoidance area 241 passes through both sides of the current collecting component 24 along the second direction Y, the multiple pole ears 2232 of the pole ear group 222 can pass through the avoidance area 241 and then be connected to the side of the current collecting component 24 away from the main group 221. The battery cell 20 adopting this structure is convenient for setting the pole ear 2232 to be connected to the side of the current collecting component 24 away from the main group 221, which can reduce the difficulty of the pole ear 2232 bypassing the current collecting component 24 and optimize the length of the pole ear 2232 bypassing the current collecting component 24, thereby alleviating the redundancy of the pole ear 2232 and reducing the manufacturing cost of the battery cell 20.

[0170] In some embodiments, see Figure 7 As shown, the avoidance area 241 is a through hole provided on the current collecting member 24. Of course, in other embodiments, the avoidance area 241 can also be other structures, for example, referring to Figure 8 , Figure 8 A schematic diagram of the structure of the second current collecting component 26 of the battery cell 20 provided in some embodiments of the present application in other embodiments, the avoidance area 241 is a notch arranged on the edge of the current collecting component 24 in the first direction X, that is, the avoidance area 241 is a notch arranged on the surface of the edge of the current collecting component 24 in the first direction X, and the notch runs through both sides of the current collecting component 24 along the second direction Y.

[0171] The avoidance area 241 can be a through hole set on the current collecting component 24 or a notch set at the edge of the current collecting component 24, so that the pole ear 2232 can pass through the avoidance area 241 and connect to the side of the current collecting component 24 away from the main group 221. The structure is simple and easy to manufacture.

[0172] According to some embodiments of the present application, referring to Figure 4 , and please refer to Fig. 9 , Fig. 9 A schematic diagram of the structure of the first current collecting member 25 of the battery cell 20 provided in some embodiments of the present application. The multiple current collecting members 24 include at least one first current collecting member 25, and along the first direction X, the two electrode tab groups 222 close to each other in two adjacent electrode groups 22 are connected to one first current collecting member 25. The first current collecting member 25 is provided with two rows of avoidance areas 241 arranged at intervals along the first direction X, and each row of avoidance areas 241 is used for allowing multiple electrode tabs 2232 of a electrode tab group 222 to pass through.

[0173] Among them, the first current collecting component 25 is a current collecting component 24 among multiple current collecting components 24 that is used to connect with two electrode tab groups 222 close to each other in two adjacent pole groups 22. That is to say, the current collecting component 24 connected to two electrode tab groups 222 close to each other in two adjacent pole groups 22 is the first current collecting component 25.

[0174] The first current collecting member 25 is provided with two rows of avoidance areas 241 arranged at intervals along the first direction X, that is, the first current collecting member 25 is provided with two rows of avoidance areas 241 arranged at intervals along the first direction X and corresponding to the two tab groups 222 .

[0175] It should be noted that, in the two rows of avoidance areas 241 provided on the first current collecting member 25, each row of avoidance areas 241 may be provided with only one avoidance area 241, and the multiple pole ears 2232 of the pole ear group 222 all pass through the first current collecting member 25 through the same avoidance area 241 and are connected to the side of the first current collecting member 25 away from the main body group 221, or it may include multiple avoidance areas 241 arranged at intervals along the third direction Z, and each pole ear 2232 of the pole ear group 222 passes through the first current collecting member 25 through one avoidance area 241, or every two pole ears 2232 or every three pole ears 2232 of the pole ear group 222 pass through the first current collecting member 25 through one avoidance area 241. For example, in Figure 4 and Fig. 9 In the embodiment, two rows of avoidance areas 241 arranged at intervals along the first direction X are provided on the first current collecting component 25, and each row of avoidance areas 241 includes a plurality of avoidance areas 241 arranged at intervals along the third direction Z. Every two pole ears 2232 of the plurality of pole ears 2232 of the pole ear group 222 pass through the first current collecting component 25 through a avoidance area 241 and are connected to the side of the first current collecting component 25 away from the main body group 221.

[0176] By providing two rows of avoidance areas 241 arranged along the first direction X on the first current collecting component 25, and the two rows of avoidance areas 241 are respectively provided for the multiple pole lugs 2232 of the two pole lug groups 222 to pass through, so that the pole lugs 2232 of the two pole lug groups 222 close to each other in the two adjacent pole groups 22 are connected to the side of the first current collecting component 25 away from the main group 221, it is beneficial to reduce the difficulty of assembling the battery cell 20 and can reduce the interference between the two pole lug groups 222.

[0177] According to some embodiments of the present application, see Figure 4 , Figure 7 and Figure 8 The plurality of current collecting members 24 include two second current collecting members 26. The first current collecting member 25 is located between the two second current collecting members 26 along the first direction X. Along the first direction X, the two second current collecting members 26 are respectively connected to the two electrode tab groups 222 that are farthest apart from each other in the plurality of electrode groups 22.

[0178] Among them, the second current collecting component 26 is the outermost current collecting component 24 among the multiple current collecting components 24 arranged at intervals in the first direction X, and is used for the two pole lug groups 222 farthest apart from the multiple pole groups 22. The current collecting component 24 located between the two second current collecting components 26 is the first current collecting component 25. That is to say, among the multiple pole lug groups 222 of the multiple pole groups 22, the current collecting component 24 connected to the two outermost pole lug groups 222 in the first direction X is the second current collecting component 26.

[0179] For example, in an embodiment where the current collecting member 24 is provided with the avoidance area 241 , the second current collecting member 26 is provided with a plurality of avoidance areas 241 arranged at intervals along the third direction Z for the plurality of tabs 2232 of the corresponding tab group 222 to pass through.

[0180] The multiple current collecting components 24 also include two second current collecting components 26, and the first current collecting component 25 is arranged between the two second current collecting components 26 in the first direction X, so that the first current collecting component 25 and the second current collecting component 26 are arranged along the first direction X and the two second current collecting components 26 are respectively located on both sides, so that it is convenient for the two pole ear groups 222 farthest apart in the multiple pole groups 22 to be connected to the two second current collecting components 26 respectively, which is beneficial to reduce the difficulty of assembling the battery cell 20.

[0181] According to some embodiments of the present application, see Figure 3 and Figure 4 Along the second direction Y, the wall portion 211 is located on one side of the plurality of pole groups 22 , the pole tab group 222 is disposed on the side of the main body group 221 facing the wall portion 211 , and the current collecting member 24 is disposed on the side of the main body group 221 facing the wall portion 211 .

[0182] The tab group 222 is disposed on the side of the main body group 221 facing the wall portion 211 , that is, the main body group 221 and the wall portion 211 are arranged along the second direction Y, and the tab group 222 is connected to the side of the main body group 221 facing the wall portion 211 .

[0183] The current collecting member 24 is disposed on the side of the main body group 221 facing the wall portion 211, that is, the current collecting member 24 and the wall portion 211 are arranged along the second direction Y on the side of the main body group 221 where the tab group 222 is disposed. Figure 4 In the embodiment, the current collecting member 24 is arranged inside the housing 21, that is, the main body group 221, the current collecting member 24 and the wall portion 211 are arranged in sequence along the second direction Y, so that the current collecting member 24 is located between the main body group 221 and the wall portion 211 along the second direction Y. Of course, in the embodiment in which the current collecting member 24 is arranged outside the housing 21, the main body group 221, the wall portion 211 and the current collecting member 24 are arranged in sequence along the second direction Y, so that the current collecting member 24 is located on the side of the wall portion 211 away from the main body group 221 in the second direction Y, so that the wall portion 211 is located between the main body group 221 and the current collecting member 24 in the second direction Y.

[0184] By setting the wall portion 211 to be located on the side of the pole group 22 on which the pole lug group 222 is provided in the second direction Y, and the current collecting component 24 is set on the side of the main body group 221 facing the wall portion 211, it is convenient for the current collecting component 24 to connect the pole lug group 222 and the electrode terminal 23 set on the wall portion 211, and the current collecting component 24 can be set as a whole on the side of the main body group 221 facing the wall portion 211, which is beneficial to saving the space occupied by the current collecting component 24 and improving the energy density of the battery cell 20.

[0185] In some embodiments, see Figure 4 , Figure 7 and Fig. 9 As shown, along the second direction Y, a protrusion 242 is protruded from one side of the current collecting member 24 facing the wall portion 211 , and the protrusion 242 is connected to the electrode terminal 23 .

[0186] Exemplarily, the current collecting member 24 is disposed inside the housing 21, and correspondingly, the protrusion 242 is protruding from the side of the current collecting member 24 away from the main body group 221. Of course, in the embodiment where the current collecting member 24 is disposed outside the housing 21, the current collecting member 24 is located on the side of the wall portion 211 away from the main body group 221, and the protrusion 242 is protruding from the side of the current collecting member 24 facing the main body group 221.

[0187] Illustratively, the current collecting member 24 is connected to the electrode terminal 23 by welding through the protrusion 242 .

[0188] By providing a protrusion 242 on one side of the current collecting component 24 facing the wall portion 211 along the second direction Y, the current collecting component 24 can be connected to the electrode terminal 23 through the protrusion 242 to achieve electrical connection between the current collecting component 24 and the electrode terminal 23. The current collecting component 24 adopting this structure can reduce the difficulty of assembling the current collecting component 24 and the electrode terminal 23, and the structure in which the protrusion 242 and the electrode terminal 23 are connected to each other can improve the connection reliability between the current collecting component 24 and the electrode terminal 23.

[0189] According to some embodiments of the present application, referring to Fig.10 , Fig.11 , Fig.12 and Fig.13 , Fig.10 This is a schematic diagram of the structure of a battery cell 20 provided in some other embodiments of the present application. Fig.11 The structural exploded diagram of the battery cell 20 provided in some embodiments of the present application is as follows: Fig.12 This is a schematic structural diagram of a first current collecting member 25 of a battery cell 20 provided in some other embodiments of the present application. Fig.13 A schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided for some other embodiments of the present application. Along the third direction Z, the wall portion 211 is located on one side of the plurality of pole groups 22, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other. The current collecting member 24 includes a first connecting portion 243 and a second connecting portion 244 that are connected to each other. Along the third direction Z, the first connecting portion 243 is located on one side of the plurality of pole groups 22 facing the wall portion 211, and the first connecting portion 243 is connected to the electrode terminal 23. Along the second direction Y, the second connecting portion 244 is located on one side of the main body group 221 where the pole tab group 222 is provided, and the second connecting portion 244 is connected to the pole tab group 222.

[0190] Among them, along the third direction Z, the wall portion 211 is located on one side of the plurality of pole groups 22 , that is, the wall of the shell 21 located on one side of the pole group 22 in the third direction Z is the wall portion 211 , so that the electrode terminal 23 is located on one side of the pole group 22 in the third direction Z.

[0191] For example, in Fig.11In the embodiment, the battery cell 20 is provided with only one wall portion 211, and the plurality of electrode terminals 23 are all mounted on the one wall portion 211, so that the first connection portions 243 of the plurality of current collecting members 24 are all located on the side of the plurality of pole groups 22 facing the wall portion 211 in the third direction Z. Of course, in other embodiments, the battery cell 20 may also be provided with two wall portions 211, and the two wall portions 211 are respectively located on both sides of the plurality of pole groups 22 in the third direction Z, and the plurality of electrode terminals 23 may be partially disposed on one wall portion 211 of the two wall portions 211, and the other part is disposed on the other wall portion 211. In this embodiment, the first connection portion 243 of each current collecting member 24 is located on the side of the plurality of pole groups 22 facing the corresponding electrode terminal 23 in the third direction Z.

[0192] Along the third direction Z, the first connection portion 243 is located on one side of the plurality of pole groups 22 facing the wall portion 211, that is, along the third direction Z, the wall portion 211 and the first connection portion 243 are arranged on one side of the pole group 22. Fig.11 In the embodiment, the current collecting member 24 is disposed inside the housing 21, and correspondingly, the pole group 22, the first connecting portion 243 and the wall portion 211 are arranged in sequence along the third direction Z, that is, the first connecting portion 243 is located between the pole group 22 and the wall portion 211 in the third direction Z. Of course, in the embodiment in which the current collecting member 24 is disposed outside the housing 21, the first connecting portion 243 is located on the side of the wall portion 211 away from the pole group 22 in the third direction Z, so that the pole group 22, the wall portion 211 and the first connecting portion 243 are arranged in sequence along the third direction Z.

[0193] Along the second direction Y, the second connection portion 244 is located on the side of the main body group 221 where the tab group 222 is provided, that is, the second connection portion 244 and the main body group 221 are arranged along the second direction Y, so that the second connection portion 244 and the first connection portion 243 are connected to each other to form an L-shaped current collecting member 24. Fig.11 In the embodiment, the current collecting member 24 is disposed inside the housing 21, and correspondingly, the second connection portion 244 of the current collecting member 24 is located on the side of the main body group 221 provided with the tab group 222 in the second direction Y, and is located between the main body group 221 and the housing 21. Of course, in the embodiment where the current collecting member 24 is disposed outside the housing 21, the second connection portion 244 of the current collecting member 24 is located on the side of the main body group 221 provided with the tab group 222 in the second direction Y, and is located on the side of the housing 21 away from the main body group 221.

[0194] The second connection portion 244 serves to connect the multiple tabs 2232 of the tab group 222 . The connection structure between the second connection portion 244 and the multiple tabs 2232 of the tab group 222 can be various, such as welding connection, abutment connection or bolt connection.

[0195] See also Fig.12 and Fig.13 As shown, in the embodiment in which the current collecting component 24 is provided with an avoidance area 241, the avoidance area 241 is provided on the second connecting portion 244 of the current collecting component 24, that is, the avoidance area 241 passes through both sides of the second connecting portion 244 along the second direction Y, so that the multiple pole ears 2232 of the pole ear group 222 pass through the avoidance area 241 and are connected to the side of the second connecting portion 244 away from the main body group 221.

[0196] For example, in Fig.12 and Fig.13 In the embodiment, the avoidance area 241 is a notch provided at the edge of the second connection portion 244 in the first direction X. Of course, in other embodiments, refer to Fig.14 , Fig.14 The schematic diagram of the structure of the second current collecting member 26 of the battery cell 20 provided in other embodiments of the present application, the avoidance area 241 may also be a through hole provided on the second connecting portion 244. Similarly, the avoidance area 241 provided on the second connecting portion 244 may be one or more.

[0197] It should be noted that the first connection part 243 and the second connection part 244 can be an integral structure, that is, the first connection part 243 and the second connection part 244 are integrally formed, and the first connection part 243 and the second connection part 244 can be made by an integral forming process such as stamping or casting. Of course, the first connection part 243 and the second connection part 244 can also be a split structure, that is, the first connection part 243 and the second connection part 244 are separately arranged, and the first connection part 243 and the second connection part 244 can be connected by welding or bolting.

[0198] The wall portion 211 of the shell 21 is located on one side of the plurality of pole groups 22 in the third direction Z, and the current collecting member 24 includes a first connecting portion 243 located on the side of the plurality of pole groups 22 facing the wall portion 211 in the third direction Z and a second connecting portion 244 located on the side of the main body group 221 on which the pole tab group 222 is provided in the second direction Y. By connecting the first connecting portion 243 to the electrode terminal 23 provided on the wall portion 211 and connecting the second connecting portion 244 to the pole tab group 222, the pole tab group 222 is electrically connected to the electrode terminal 23 through the current collecting member 24. The battery cell 20 adopting this structure can, on the one hand, separate the area of ​​the shell 21 where the electrode terminal 23 is provided and the area of ​​the main body group 221 where the pole tab group 222 is provided, so that the side of the shell 21 where the pole tab group 222 is provided faces the side of the main body group 221 The electrode terminal 23 is not provided in the area 21, so that the plurality of battery cells 20 can be stacked and placed along the second direction Y. On the other hand, the area where the current collecting member 24 is connected to the electrode terminal 23 and the area where the current collecting member 24 is connected to the tab group 222 can be separated from each other, which is beneficial to reducing the difficulty of assembling the current collecting member 24, the electrode terminal 23 and the tab group 222, and can reduce the interference between the electrode terminal 23 and the tab group 222, especially when the electrode terminal 23 and the tab group 222 are welded to the current collecting member 24, the mutual influence between the welding molten pool of the electrode terminal 23 and the current collecting member 24 and the welding molten pool of the tab group 222 and the current collecting member 24 can be effectively reduced, which is beneficial to improving the assembly quality and stability of the electrode terminal 23 and the tab group 222 connected to the current collecting member 24.

[0199] In some embodiments, see Fig.11 , Fig.12 and Figure 3 As shown, along the third direction Z, a protrusion 242 is protruded from one side of the first connection portion 243 facing the wall portion 211 , and the protrusion 242 is connected to the electrode terminal 23 .

[0200] Exemplarily, the current collecting member 24 is disposed inside the housing 21, and correspondingly, the protrusion 242 is protruding from the side of the first connection portion 243 of the current collecting member 24 away from the pole group 22. Of course, in the embodiment where the current collecting member 24 is disposed outside the housing 21, the first connection portion 243 of the current collecting member 24 is located on the side of the wall portion 211 away from the pole group 22, and the protrusion 242 is protruding from the side of the first connection portion 243 of the current collecting member 24 facing the pole group 22.

[0201] Illustratively, the first connection portion 243 of the current collecting member 24 is connected to the electrode terminal 23 by welding through the protrusion 242 .

[0202] By providing a protrusion 242 on the side of the first connection portion 243 of the current collecting component 24 facing the wall portion 211, the first connection portion 243 of the current collecting component 24 can be connected to the electrode terminal 23 through the protrusion 242 to achieve electrical connection between the current collecting component 24 and the electrode terminal 23. The current collecting component 24 adopting this structure can reduce the difficulty of assembling the first connection portion 243 of the current collecting component 24 and the electrode terminal 23, and the structure in which the protrusion 242 and the electrode terminal 23 are connected to each other can improve the connection reliability between the first connection portion 243 of the current collecting component 24 and the electrode terminal 23.

[0203] According to some embodiments of the present application, a buffer (not shown in the figure) is disposed between two adjacent pole groups 22 along the first direction X. That is, two adjacent pole groups 22 are separated by a buffer.

[0204] Exemplarily, the buffer member may be of various types, such as foam, silicone pad or rubber pad.

[0205] It should be noted that the main body group 221 of the electrode group 22 includes a plurality of main body parts 2231 stacked along the third direction Z. In some embodiments, a buffer may also be provided between every two adjacent main body parts 2231 .

[0206] By arranging a buffer between two adjacent pole groups 22, the buffer can play a buffering role between the two adjacent pole groups 22, so that the buffer can absorb the expansion force and collision force between the pole groups 22, thereby effectively alleviating the collision phenomenon between the two adjacent pole groups 22, and effectively alleviating the extrusion phenomenon of the mutual expansion of the two adjacent pole groups 22, thereby effectively improving the reliability and service life of the battery cell 20.

[0207] According to some embodiments of the present application, see Figure 4 and Fig.11 As shown, the main body group 221 includes N main body parts 2231 stacked along the third direction Z, and the pole ear group 222 includes a plurality of pole ears 2232 spaced apart along the third direction Z, the pole ears 2232 correspond to the main body parts 2231 one by one, and the pole ears 2232 are connected to one end of the main body part 2231 in the second direction Y. The first direction X, the second direction Y and the third direction Z are not coplanar and intersect with each other, satisfying that N≥4.

[0208] Among them, the main body group 221 is formed by the main body parts 2231 of multiple electrode assemblies 223 stacked along the third direction Z. The main body group 221 includes N main body parts 2231 stacked along the third direction Z, that is, the electrode group 22 includes N electrode assemblies 223 stacked along the third direction Z.

[0209] Exemplarily, the number of electrode assemblies 223 arranged along the third direction Z in each electrode group 22 may be four, five, six, seven, eight or nine, etc.

[0210] By setting the number of main body portions 2231 of the main body group 221 of the electrode group 22 stacked in the third direction Z to be greater than or equal to 4, the number of electrode assemblies 223 stacked in the third direction Z of the electrode group 22 is increased, thereby realizing a large-capacity battery cell 20. It is not necessary to increase the winding size or stacking size of a single electrode assembly 223, so as to realize a large-capacity battery cell 20, which is beneficial to reduce the manufacturing difficulty and manufacturing cost of a single electrode assembly 223.

[0211] According to some embodiments of this application, please continue to refer to Figure 4 and Fig.11 As shown, the housing 21 is in a rectangular parallelepiped shape. Along the second direction Y, the housing 21 has two opposite first outer surfaces, and the first outer surface is the outer surface with the largest area in the housing 21.

[0212] The first outer surface is the outer surface with the largest area in the shell 21 , that is, the size of the shell 21 in the second direction Y is smaller than the sizes of the shell 21 in the first direction X and the third direction Z.

[0213] By setting the outer shell 21 of the battery cell 20 to a rectangular structure, and the first outer surface of the outer shell 21 in the second direction Y being the surface with the largest area among the outer surfaces of the outer shell 21, the tab group 222 is arranged on the side of the main body group 221 facing the largest wall of the outer shell 21, thereby facilitating the assembly of the tab group 222 with other components and facilitating subsequent maintenance of the tab group 222.

[0214] According to some embodiments of the present application, see Figure 3 and Figure 4 as well as Fig.10 and Fig.11 As shown, the housing 21 may include a shell 212 and an end cover 213 . The shell 212 has an accommodation cavity with an opening 2121 formed inside. The accommodation cavity is used to accommodate the pole group 22 . The end cover 213 closes the opening 2121 . The end cover 213 is a wall portion 211 .

[0215] The end cover 213 is the wall portion 211 , that is, the electrode terminal 23 is mounted on the end cover 213 .

[0216] By setting the wall portion 211 of the shell 21 as the end cover 213 of the shell 21 for closing the opening 2121, the battery cell 20 with this structure is convenient for assembling the electrode terminal 23 on the end cover 213, which is beneficial to reduce the assembly difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0217] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also be other structures. For example, the outer shell 21 may include a shell 212 and an end cover 213. The interior of the shell 212 forms a accommodating cavity with an opening 2121, and the accommodating cavity is used to accommodate the electrode group 22. The end cover 213 closes the opening 2121. The shell 212 includes a wall portion 211, that is, the wall portion 211 is a wall of the shell 212. The wall portion 211 can be a bottom wall of the shell 212 and the end cover 213 arranged opposite to each other, or a side wall of the shell 212 and the end cover 213 connected and adjacent to each other. In other words, the electrode terminal 23 is installed on the shell 212.

[0218] By setting the wall portion 211 of the outer shell 21 as a wall of the shell 212, the battery cell 20 adopting this structure can make the area of ​​the outer shell 21 where the electrode terminal 23 is installed away from the end cover 213, thereby alleviating the phenomenon that the force generated by the electrode terminal 23 and other components pulling or twisting the wall portion 211 directly acts on the end cover 213, which is beneficial to reducing the risk of connection failure between the end cover 213 and the shell 212, and further effectively reducing the risk of leakage of the battery cell 20 during use.

[0219] According to some embodiments of the present application, see Figure 2 As shown, the present application also provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above solutions.

[0220] Among them, Figure 2 In the embodiment, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0221] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0222] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0223] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0224] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0225] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0226] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0227] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0228] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0229] According to some embodiments of the present application, the present application further provides an energy storage cabinet, which includes a plurality of battery cells 20 according to any of the above schemes.

[0230] The energy storage cabinet includes a cabinet body, a plurality of battery cells 20 are arranged in the cabinet body, and the plurality of battery cells 20 are arranged along the second direction Y.

[0231] According to some embodiments of the present application, see Figures 3 to 9As shown, the present application provides a battery cell 20, which includes a shell 21, a plurality of electrode groups 22, a plurality of electrode terminals 23 and a plurality of current collecting members 24. The shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213. The shell 212 has a receiving cavity with an opening 2121 formed inside, and the end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211. The shell 21 is in a rectangular parallelepiped shape, and along the second direction Y, the shell 21 has two opposite first outer surfaces, and the first outer surface is the outer surface with the largest area in the shell 21. Multiple pole groups 22 are all accommodated in the accommodating cavity of the shell 212 and are arranged along the first direction X. The wall portion 211 is located on one side of the multiple pole groups 22 in the second direction Y. Each pole group 22 includes a plurality of electrode assemblies 223 stacked along the third direction Z. The electrode assembly 223 includes a main body 2231 and two pole ears 2232. The two pole ears 2232 have opposite polarities and are both arranged at one end of the main body 2231 facing the wall portion 211 in the second direction Y. The two pole ears 2232 are arranged at intervals along the first direction X. The main body 2231 of the plurality of electrode assemblies 223 forms the main body group 221 of the electrode group 22, and the two pole ears 2232 of the plurality of electrode assemblies 223 respectively form two pole ear groups 222 of the electrode group 22, and the two pole ear groups 222 are arranged at intervals along the first direction X and have opposite polarities, that is, the main body group 221 includes a plurality of main body parts 2231 stacked along the third direction Z, and the pole ear group 222 includes a plurality of pole ears 2232 arranged along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The pole group 22 includes N electrode assemblies 223 stacked along the third direction Z, satisfying that N≥4. The plurality of electrode terminals 23 are all insulated and mounted on the wall 211 and are spaced apart along the first direction X. Multiple current collecting members 24 are all disposed in the housing 21 and arranged at intervals along the first direction X. The current collecting members 24 are disposed and connected to the electrode terminals 23 in one-to-one correspondence. Along the first direction X, two electrode tab groups 222 close to each other in two adjacent electrode groups 22 are commonly connected to one current collecting member 24, and two electrode tab groups 222 farthest apart in the multiple electrode groups 22 are respectively connected to two current collecting members 24. An escape area 241 is disposed on the current collecting member 24, and the escape area 241 penetrates the current collecting member 24 along the second direction Y. Multiple electrode tabs 2232 of the electrode tab group 222 pass through the escape area 241 and are connected to the side of the current collecting member 24 facing the wall portion 211. The escape area 241 is a through hole disposed on the current collecting member 24 or a notch disposed on the edge of the current collecting member 24 in the first direction X.The multiple current collecting components 24 include at least one first current collecting component 25. Along the first direction X, two electrode tab groups 222 adjacent to each other in two adjacent electrode groups 22 are connected to one first current collecting component 25. The first current collecting component 25 is provided with two rows of avoidance areas 241 arranged at intervals along the first direction X. Each row of avoidance areas 241 includes a plurality of avoidance areas 241 arranged at intervals along the third direction Z. Each row of avoidance areas 241 is used for allowing a plurality of electrode tabs 2232 of a electrode tab group 222 to pass through. The multiple current collecting components 24 include two second current collecting components 26. Along the first direction X, the first current collecting component 25 is located between the two second current collecting components 26. The two second current collecting components 26 are respectively connected to the two electrode tab groups 222 that are farthest apart from each other in the multiple electrode groups 22. The second current collecting component 26 is provided with a plurality of avoidance areas 241 arranged at intervals along the third direction Z so as to allow a plurality of electrode tabs 2232 of the corresponding electrode tab group 222 to pass through. Along the second direction Y, a protrusion 242 is provided on one side of the current collecting member 24 facing the wall portion 211, and the protrusion 242 is connected to the electrode terminal 23. Along the first direction X, a buffer is provided between two adjacent electrode groups 22.

[0232] According to some embodiments of the present application, see Figures 10 to 14As shown, the present application provides a battery cell 20, which includes a shell 21, a plurality of electrode groups 22, a plurality of electrode terminals 23 and a plurality of current collecting members 24. The shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213. The shell 212 has a receiving cavity with an opening 2121 formed inside, and the end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211. The shell 21 is in a rectangular parallelepiped shape, and along the second direction Y, the shell 21 has two opposite first outer surfaces, and the first outer surface is the outer surface with the largest area in the shell 21. The plurality of pole groups 22 are all accommodated in the accommodation cavity of the housing 212 and arranged along the first direction X. Each pole group 22 includes a plurality of electrode assemblies 223 stacked along the third direction Z. The electrode assembly 223 includes a main body 2231 and two pole ears 2232. The two pole ears 2232 have opposite polarities and are both arranged at one end of the main body 2231 in the second direction Y. The two pole ears 2232 are arranged at intervals along the first direction X. The main bodies 2231 of the plurality of electrode assemblies 223 form the main body group 221 of the pole group 22. The two pole ears 2232 of the plurality of electrode assemblies 223 respectively form two pole ear groups 222 of the pole group 22. The two pole ear groups 222 are arranged at intervals along the first direction X and have opposite polarities, that is, the main body group 221 includes a plurality of main bodies 2231 stacked along the third direction Z. The pole ear group 222 includes a plurality of pole ears 2232 arranged along the third direction Z. The wall portion 211 is located on one side of the plurality of pole groups 22 in the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The pole group 22 includes N electrode assemblies 223 stacked along the third direction Z, satisfying that N≥4. Multiple electrode terminals 23 are insulated and installed on the wall 211 and are spaced along the first direction X. Multiple current collecting components 24 are arranged in the housing 21 and arranged at intervals along the first direction X. The current collecting components 24 are arranged in a one-to-one correspondence with the electrode terminals 23 and are connected. Along the first direction X, two adjacent pole lug groups 222 that are close to each other in two adjacent pole groups 22 are connected to one current collecting component 24, and the two pole lug groups 222 that are farthest apart in the multiple pole groups 22 are respectively connected to two current collecting components 24. The current collecting member 24 includes a first connection portion 243 and a second connection portion 244 connected to each other. Along the third direction Z, the first connection portion 243 is located on the side of the plurality of pole groups 22 facing the wall portion 211, and the first connection portion 243 is connected to the electrode terminal 23. Along the second direction Y, the second connection portion 244 is located on the side of the main body group 221 provided with the pole tab group 222, and the second connection portion 244 is connected to the pole tab group 222. A protrusion 242 is protruded on the side of the first connection portion 243 facing the wall portion 211, and the protrusion 242 is connected to the electrode terminal 23. An avoidance area 241 is provided on the second connection portion 244, and the avoidance area 241 penetrates the second connection portion 244 along the second direction Y. The plurality of pole tabs 2232 of the pole tab group 222 pass through the avoidance area 241 and are connected to the side of the second connection portion 244 facing the wall portion 211.The avoidance area 241 is a through hole provided on the second connection portion 244 or a notch provided on the edge of the second connection portion 244 in the first direction X. The multiple current collecting components 24 include at least one first current collecting component 25. Along the first direction X, two electrode tab groups 222 close to each other in two adjacent electrode groups 22 are connected to the second connection portion 244 of a first current collecting component 25. Two rows of avoidance areas 241 arranged at intervals along the first direction X are provided on the second connection portion 244 of the first current collecting component 25. Each row of avoidance areas 241 includes a plurality of avoidance areas 241 arranged at intervals along the third direction Z. Each row of avoidance areas 241 is used for allowing a plurality of electrode tabs 2232 of a electrode tab group 222 to pass through. The plurality of current collecting members 24 include two second current collecting members 26. Along the first direction X, the first current collecting member 25 is located between the two second current collecting members 26. The first connecting portions 243 of the two second current collecting members 26 are respectively connected to the two farthest pole tab groups 222 in the plurality of pole groups 22. The second connecting portions 244 of the second current collecting members 26 are provided with a plurality of avoidance areas 241 arranged at intervals along the third direction Z for the passage of the plurality of pole tabs 2232 of the corresponding pole tab group 222. Along the first direction X, a buffer is provided between two adjacent pole groups 22.

[0233] 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.

[0234] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, It is characterized in that include: a housing having a wall portion; A plurality of pole groups, contained in the housing and arranged along a first direction, the pole groups comprising a main body group and two pole tab groups, the two pole tab groups being spaced apart along the first direction at one side of the main body group in a second direction, and the two pole tab groups having opposite polarities, and the second direction intersecting with the first direction; as well as A plurality of electrode terminals are mounted on the wall portion and spaced apart along the first direction; Among them, along the first direction, the two electrode tab groups close to each other in two adjacent electrode groups have the same polarity and are electrically connected to one electrode terminal, and the two electrode tab groups farthest apart in the multiple electrode groups are electrically connected to two electrode terminals respectively.

2. The battery cell according to claim 1, It is characterized in that The battery cell further comprises: A plurality of current collecting components are arranged corresponding to the plurality of electrode terminals one by one, and the current collecting components are connected to the corresponding electrode terminals; Wherein, along the first direction, two electrode tab groups close to each other in two adjacent electrode groups are electrically connected to one current collecting component, and two electrode tab groups farthest apart in the plurality of electrode groups are electrically connected to two current collecting components respectively.

3. The battery cell according to claim 2, It is characterized in that A plurality of the current collecting components are disposed in the housing, and the plurality of current collecting components are arranged at intervals along the first direction; or Along the second direction, a side of the shell close to the tab group is provided with a channel for each tab group to extend out, and each tab group can extend out of the shell through the corresponding channel. A plurality of current collecting components are arranged outside the shell, and the current collecting components are electrically connected to the extended tab groups.

4. The battery cell according to claim 2, It is characterized in that The tab group includes a plurality of tabs spaced apart along a third direction, wherein the first direction, the second direction and the third direction are not coplanar and intersect each other; Wherein, along the second direction, at least part of the current collecting member is located on a side of the main body group where the tab group is disposed, and part of the tab is located on a side of the current collecting member away from the main body group and connected to the current collecting member.

5. The battery cell according to claim 4, It is characterized in that The current collecting component is provided with an escape zone, the escape zone penetrates the current collecting component along the second direction, and the electrode tab passes through the escape zone and is connected to a side of the current collecting component away from the main body group.

6. The battery cell according to claim 5, It is characterized in that The avoidance area is a through hole provided on the current collecting component; or The avoidance area is a notch provided at an edge of the current collecting component in the first direction.

7. The battery cell according to claim 5, It is characterized in that The plurality of current collecting components include at least one first current collecting component, and along the first direction, two electrode tab groups close to each other in two adjacent electrode groups are both connected to one first current collecting component; Wherein, the first current collecting member is provided with two rows of the avoidance areas arranged at intervals along the first direction, and each row of the avoidance areas is used for allowing a plurality of the tabs of one tab group to pass through.

8. The battery cell according to claim 7, It is characterized in that The plurality of current collecting members include two second current collecting members, and along the first direction, the first current collecting member is located between the two second current collecting members; Wherein, along the first direction, two of the second current collecting components are respectively connected to two of the electrode lug groups that are farthest apart from each other among the plurality of electrode groups.

9. The battery cell according to any one of claims 2 to 8, It is characterized in that Along the second direction, the wall portion is located on one side of the plurality of electrode groups, the electrode tab group is arranged on a side of the main body group facing the wall portion, and the current collecting member is arranged on a side of the main body group facing the wall portion.

10. The battery cell according to claim 9, It is characterized in that Along the second direction, a protrusion is protruded from one side of the current collecting member facing the wall portion, and the protrusion is connected to the electrode terminal.

11. The battery cell according to any one of claims 2 to 8, It is characterized in that Along the third direction, the wall portion is located on one side of the plurality of pole groups, and the first direction, the second direction and the third direction are not coplanar and intersect each other; In which, the current collecting component includes a first connecting portion and a second connecting portion that are connected to each other. Along the third direction, the first connecting portion is located on the side of the plurality of pole groups facing the wall portion, and the first connecting portion is connected to the electrode terminal. Along the second direction, the second connecting portion is located on the side of the main body group where the pole tab group is provided, and the second connecting portion connects the pole tab group.

12. The battery cell according to claim 11, It is characterized in that Along the third direction, a protrusion is protruded from a side of the first connection portion facing the wall portion, and the protrusion is connected to the electrode terminal.

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

14. The battery cell according to claim 1, It is characterized in that The main body group includes N main body parts stacked along a third direction, and the pole lug group includes a plurality of pole lugs spaced apart along the third direction, the pole lugs correspond to the main body parts one by one, and the pole lugs are connected to one end of the main body part in the second direction, and the first direction, the second direction and the third direction are not coplanar and intersect each other, satisfying that N≥4.

15. The battery cell according to claim 1, It is characterized in that The shell is in a rectangular parallelepiped shape, and has two opposite first outer surfaces along the second direction, wherein the first outer surface is the outer surface with the largest area in the shell.

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

17. A battery, It is characterized in that Comprising a battery cell as claimed in any one of claims 1 to 16.

18. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 16, wherein the battery cell is used to provide electrical energy.

19. An energy storage cabinet, It is characterized in that The invention comprises a plurality of battery cells according to any one of claims 1 to 16.

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