Battery monomer, battery device and electric device

Abstract

The invention discloses a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, an electrode terminal, an electrode assembly, and a first current collecting member. The housing has a first wall. The electrode terminal is arranged on the first wall in an insulating manner. The electrode assembly is accommodated in the shell, the electrode assembly comprises a main body part, a first tab and a second tab, the polarities of the first tab and the second tab are opposite, the first tab and the second tab are arranged at one end, facing the first wall, of the main body part in the thickness direction of the first wall, and the second tab is electrically connected with the electrode terminal; the first current collecting component is used for electrically connecting the first wall and the first tab, the base material of the first wall is different from the base material of the first tab, and the structure can improve the reliability of the single battery.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely. Batteries have high energy density, high reliability, long service life and are environmentally friendly. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swapping stations, engineering manufacturing, and intelligent equipment. They also promote the development and research of technologies in communication terminals, medical devices, and energy development.

[0003] In battery technology, improving the reliability of individual battery cells is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, electrode terminals, an electrode assembly, and a first current collector. The casing has a first wall; the electrode terminals are insulatedly disposed on the first wall; the electrode assembly is housed within the casing, and the electrode assembly includes a main body, a first tab, and a second tab. The first tab and the second tab have opposite polarities. Along the thickness direction of the first wall, both the first tab and the second tab are disposed at the end of the main body facing the first wall, and the second tab is electrically connected to the electrode terminals; the first current collector is used to electrically connect the first wall and the first tab, and the base material of the first wall is different from the base material of the first tab.

[0006] The first current collector includes a first sub-component and a second sub-component connected to each other. The base material of the first sub-component is the same as the base material of the first electrode tab, and the first sub-component is welded to the first electrode tab. The base material of the second sub-component is the same as the base material of the first wall, and the second sub-component is welded to the first wall.

[0007] In the above technical solution, by making the base material of the first sub-component the same as the base material of the first wall, and the base material of the second sub-component the same as the base material of the first electrode tab, the first sub-component and the first wall are welded with the same material, and the second sub-component and the first electrode tab are also welded with the same material. This satisfies the overcurrent requirement and reduces the risk of reduced airtightness of the battery cell caused by welding cracks in the first wall due to welding with different materials between the first wall and the first current collector. Therefore, it can improve the reliability of the battery cell.

[0008] In some embodiments, the connection method between the first sub-component and the second sub-component includes one or more of welding, hot pressing, rolling and riveting.

[0009] In some embodiments, the second sub-component is ring-shaped.

[0010] In the above technical solution, the second sub-component is ring-shaped, which not only facilitates welding of the second sub-component to the first wall, but also increases the weldable area between the second sub-component and the first wall, thus helping to improve the connection stability between the second sub-component and the first wall.

[0011] In some embodiments, the second sub-component is disposed around the first sub-component, and the inner periphery of the second sub-component is connected to the outer edge of the first sub-component.

[0012] In the above technical solution, the second sub-component is arranged around the first sub-component, and the inner periphery of the second sub-component is connected to the outer edge of the first sub-component. In this way, the structure of the first current collector is more compact, the first sub-component does not occupy the space outside the second sub-component, and the second sub-component and the first sub-component can share a part of the size along the thickness direction of the first wall, reducing the space occupied along the thickness direction of the first wall, allowing the electrode assembly to be larger in the thickness direction of the first wall, and improving the energy density of the battery cell.

[0013] In some embodiments, along the thickness direction of the first wall, the first sub-component and the second sub-component are stacked, with the second sub-component located between the first wall and the first sub-component.

[0014] In the above technical solution, the first sub-component and the second sub-component are stacked: on the one hand, this facilitates the connection between the second sub-component and the first sub-component, which helps to improve the reliability of the connection between the first sub-component and the second sub-component; on the other hand, during the welding process between the second sub-component and the first wall, the first sub-component can support the second sub-component, which helps to improve the welding reliability between the second sub-component and the first wall.

[0015] In some embodiments, the battery cell further includes a second current collector for electrically connecting the electrode terminal and the second tab.

[0016] In the above technical solution, the second current collector makes it easier to electrically connect the electrode terminals to the second electrode tab.

[0017] In some embodiments, the battery cell further includes an insulating element located between the electrode assembly and the first wall, the insulating element insulatingly isolating the first current collector and the second current collector.

[0018] In the above technical solution, the insulating component isolates the first current collector and the second current collector, which can reduce the risk of short circuit between the first current collector and the second current collector and improve the reliability of the battery cell.

[0019] In some embodiments, along the thickness direction of the first wall, at least a portion of the first sub-component is located on the side of the insulator facing the first wall, and at least a portion of the second current collector is located on the side of the insulator away from the first wall.

[0020] In the above technical solution, at least a portion of the first sub-component is located on the side of the insulating member facing the first wall, and at least a portion of the second current collector is located on the side of the insulating member away from the first wall. In this way, at least a portion of the first sub-component and the second current collector are located on opposite sides of the insulating member, which can greatly reduce the short circuit risk of the first sub-component and the second current collector.

[0021] In some embodiments, the insulating member is provided with a first through hole and a second through hole, both of which penetrate the insulating member along the thickness direction of the first wall; a portion of the first sub-component is accommodated in the first through hole and connected to the first electrode tab; a portion of the second current collector is accommodated in the second through hole and connected to the electrode terminal.

[0022] In the above technical solution, a portion of the first sub-component is housed within the first through hole, which facilitates the connection between the first sub-component and the first electrode tab. A portion of the second current collector is housed within the second through hole, which facilitates the connection between the second current collector and the electrode terminal.

[0023] In some embodiments, along the thickness direction of the first wall, the first through hole is disposed opposite to the first tab, and the second through hole is disposed opposite to the electrode terminal.

[0024] In the above technical solution, the first through hole and the first electrode tab are arranged opposite to each other, so that the part of the first sub-component housed in the first through hole can be opposite to the first electrode tab, thereby alleviating the stress concentration caused by the misalignment connection between the first electrode tab and the first sub-component.

[0025] The second through hole is positioned opposite to the electrode terminal, so that the portion of the second current collector contained within the second through hole can be aligned with the electrode terminal, thus alleviating stress concentration caused by misalignment between the second current collector and the electrode terminal.

[0026] In some embodiments, the insulating member includes a first peripheral portion and a first main portion, the first peripheral portion being annular; the first main portion being disposed within the first peripheral portion, the first main portion being connected to a portion of the inner periphery of the first peripheral portion, another portion of the inner periphery of the first peripheral portion and the edge of the first main portion forming a first through hole, and a second through hole being disposed in the first main portion.

[0027] In the above technical solution, the first outer periphery being annular can achieve a more uniform stress distribution and a stronger ability to withstand bending.

[0028] The first main body is disposed within the first peripheral part, and the first main body is connected to a portion of the inner periphery of the first peripheral part. On the one hand, this makes the insulating structure more compact, which helps to reduce the size of the insulating part and improve the space utilization of the battery cell. On the other hand, the first main body can strengthen the structural strength of the first peripheral part and obtain an insulating part with higher structural strength.

[0029] Another part of the inner periphery of the first outer periphery and the edge of the first main body form the first through hole, reducing the number of openings in the first main body.

[0030] In some embodiments, the first sub-component is provided with a third through hole, which penetrates the first sub-component along the thickness direction of the first wall; the first main body portion protrudes toward the first wall relative to the first peripheral portion, and at least a portion of the first main body portion is located within the third through hole.

[0031] In the above technical solution, at least a portion of the first main body is located within the third through hole. The third through hole can limit the movement of the first main body, thereby mitigating the movement of the insulating component within the battery cell and improving the insulation reliability of the insulating component.

[0032] In some embodiments, the first sub-component includes a second peripheral portion and a second main portion. The second peripheral portion is annular and at least a portion of the second peripheral portion is located on the side of the insulating member facing the first wall and is connected to the second sub-component. The second main portion is disposed within the second peripheral portion and is connected to a portion of the inner periphery of the second peripheral portion. Another portion of the inner periphery of the second peripheral portion and the edge of the second main portion form a third through hole. At least a portion of the second main portion is located within the first through hole and is connected to the first tab.

[0033] In the above technical solution, the second outer periphery being ring-shaped can achieve a more uniform stress distribution and a stronger ability to withstand bending in the first sub-component.

[0034] The second main body is disposed within the second peripheral part, and the second main body is connected to a portion of the inner periphery of the second peripheral part. On the one hand, this makes the structure of the first sub-component more compact, which helps to reduce the size of the first sub-component and improve the space utilization of the battery cell. On the other hand, the second main body can strengthen the structural strength of the second peripheral part, resulting in a first sub-component with higher structural strength.

[0035] Another part of the inner periphery of the second outer periphery and the edge of the second main body form a third through hole, reducing the number of openings in the second main body.

[0036] In some embodiments, the wall of the first through hole is provided with a first stepped surface, and the outer peripheral surface of the second main body is provided with a second stepped surface, the second stepped surface abutting against the first stepped surface.

[0037] In the above technical solution, the wall of the first through hole is provided with a first stepped surface, and the outer peripheral surface of the second main body is provided with a second stepped surface. By abutting the second stepped surface with the first stepped surface, the assembly stability of the first sub-component and the insulating component can be improved.

[0038] In some embodiments, the second current collector includes a third body portion and a protrusion, the protrusion protruding from the side of the third body portion facing the first wall, the protrusion being connected to the electrode terminal, at least a portion of the protrusion being accommodated in the second through hole, and the third body portion being connected to the second tab; on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the insulating member completely covers the orthographic projection of the third body portion.

[0039] In the above technical solution, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the insulating component completely covers the orthographic projection of the third main body, reducing the possibility of the third main body contacting the first wall and thus greatly reducing the risk of short circuit between the second current collector and the first wall.

[0040] In some embodiments, the first main body portion has a first groove on the side opposite to the first wall, and at least a portion of the third main body portion is accommodated in the first groove.

[0041] In the above technical solution, at least a portion of the third main body is accommodated in the first groove, and the third main body and the insulating component can share a portion of the space, thereby improving the space utilization rate of the battery cell.

[0042] In some embodiments, a second groove is provided on the side of the second peripheral portion opposite to the first wall, and at least a portion of the insulating member is accommodated in the second groove.

[0043] In the above technical solution, at least a portion of the insulating component is accommodated in the second groove, which can limit the insulating component and improve the assembly stability of the second sub-component and the insulating component.

[0044] In some embodiments, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second sub-component does not overlap with the orthographic projection of the insulating member.

[0045] In the above technical solution, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second sub-component does not overlap with the orthographic projection of the insulating component, which can reduce the risk of the insulating component being burned by welding energy during the welding process between the first wall and the second sub-component.

[0046] In some embodiments, the base material of the first tab is copper, and the base material of the first wall is steel.

[0047] In some embodiments, the battery cell is cylindrical.

[0048] Secondly, embodiments of this application provide a battery device, which includes a battery cell provided in any of the embodiments of the first aspect.

[0049] Thirdly, embodiments of this application provide an electrical device, which includes a battery device provided in any embodiment of the second aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0052] Figure 2 This is an exploded view of a battery device according to some embodiments of this application;

[0053] Figure 3 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0054] Figure 4 This is an exploded view of a battery cell according to some embodiments of this application;

[0055] Figure 5 This is a partial cross-sectional view of a battery cell according to some embodiments of this application;

[0056] Figure 6 This is an exploded view of the first current collector in some embodiments of this application;

[0057] Figure 7 This is an assembly diagram of the first sub-component and the second sub-component in some embodiments of this application;

[0058] Figure 8 This is an assembly diagram of the first sub-component and the second sub-component in some other embodiments of this application;

[0059] Figure 9 This is an assembly diagram of the first current collector, the second current collector, and the insulating component according to some embodiments of this application;

[0060] Figure 10 This is a schematic diagram of the structure of a first current collector, a second current collector, and an insulating member from one perspective, representing some embodiments of this application.

[0061] Figure 11 This is a schematic diagram of the structure of the first current collector, the second current collector, and the insulating member from another perspective, representing some embodiments of this application.

[0062] Figure 12 This is a schematic diagram of the structure of the second sub-component in some embodiments of this application;

[0063] Figure 13 This is a schematic diagram of the structure of the insulating element in some embodiments of this application;

[0064] Figure 14 This is an assembly diagram of the first current collector, the second current collector, and the insulating component according to other embodiments of this application;

[0065] Figure 15 This is a schematic diagram of the structure of the first current collector, the second current collector, and the insulating member from one perspective, according to some other embodiments of this application.

[0066] Figure 16 This is a schematic diagram of the first current collector, the second current collector, and the insulating element from another perspective, representing some other embodiments of this application.

[0067] Figure 17 This is a schematic diagram of the structure of the second sub-component in some other embodiments of this application;

[0068] Figure 18 This is an assembly diagram of the first current collector, the second current collector, and the insulating component according to some embodiments of this application;

[0069] Figure 19 for Figure 18 Sectional view along AA;

[0070] Figure 20 for Figure 19 Enlarged view of section A in the middle;

[0071] Figure 21 This is an assembly diagram of the first current collector, the second current collector, and the insulating component in some embodiments of this application;

[0072] Figure 22 for Figure 21 A cross-sectional view along BB;

[0073] Figure 23 for Figure 22 Enlarged view of section B in the middle.

[0074] Icons: 100-Battery assembly; 10-Battery cell; 11-Casing; 111-Housing shell; 112-End cap; 113-First wall; 12-Electrode assembly; 121-First tab; 122-Second tab; 123-Main body; 16-Electrode terminal; 13-First current collector; 131-Second sub-component; 132-First sub-component; 1321-Second peripheral portion; 1322-Second main body; 13221-Second stepped surface; 13221a-First arc surface; 13221b-Second arc surface; 1323-Third channel Hole; 1324 - Second groove; 14 - Second current collector; 141 - Third main body; 142 - Protrusion; 15 - Insulating component; 151 - First through hole; 1511 - First stepped surface; 1511a - Third arc surface; 1511b - Fourth arc surface; 152 - Second through hole; 153 - First groove; 155 - First peripheral part; 156 - First main body; 20 - Box; 21 - First box; 22 - Second box; 23 - Accommodation space; 1000 - Vehicle; 200 - Motor; 300 - Controller; Z - Thickness direction.

[0075] The accompanying drawings are not drawn to scale. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0078] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0079] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0080] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0082] In this application, "multiple" means two or more (including two).

[0083] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0084] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0085] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0086] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0087] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0088] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be 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. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0089] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also known as NCM) 333 ), Li Ni 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 ), LiN i 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxides (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0090] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0093] 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.

[0094] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0095] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0096] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0097] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0098] As an example, the material of the separator may include at least one of glass fiber, nonwoven 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 it may be attached to the surfaces of the positive and negative electrodes.

[0099] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0100] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0101] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0102] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0103] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0104] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0105] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0106] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphosulfur, sulfosilium germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0107] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0108] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0109] In some implementations, the electrode assembly is a stacked structure.

[0110] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0111] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0112] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0113] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0114] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0115] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0116] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0117] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0118] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it can protect the electrode assembly and prevent, to some extent, electrolyte leakage. When the housing is a non-sealed structure, it can still protect the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0119] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0120] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0121] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0122] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0123] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0124] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0125] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0126] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0127] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0128] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0129] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0130] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0131] A battery cell typically includes a casing and an electrode assembly. The electrode assembly is housed within the casing and includes two tabs of opposite polarity, which are used to output or input electrical energy to the electrode assembly. In related technologies, the two tabs of the electrode assembly are usually located on the same side (same-side output tabs) to save space occupied by the electrode assembly within the casing. Furthermore, especially in cylindrical battery cells, to simplify the structure of the battery cell, one electrode terminal is provided as an output terminal, which is electrically connected to one tab. The first wall of the casing serves as the other output terminal, and the first wall is electrically connected to the other tab through a first current collector.

[0132] In battery technology, the first wall of the casing and the first tab of the electrode assembly are electrically connected through a first current collector. The first wall and the first tab are respectively welded to the first current collector. Since the casing needs to meet rigidity requirements and the first tab needs to meet current carrying capacity requirements, the materials of the tab and the first current collector are usually different. In order to meet the current carrying capacity requirements, the base material of the first current collector is usually the same as the base material of the first tab. This results in the base material of the first current collector being different from the base material of the first wall. Welding the first current collector and the first wall with dissimilar materials is prone to welding cracks. Welding cracks in the first wall reduce the sealing reliability of the battery cell and the reliability of the battery device.

[0133] In view of this, in order to solve the problem that welding cracks are prone to occur when the first current collector and the first wall are made of different materials, and that welding cracks in the first wall reduce the sealing reliability of the battery cell and the reliability of the battery device, this application provides a technical solution. The first current collector includes a first sub-component and a second sub-component. The base material of the first sub-component is the same as the base material of the first tab, and the base material of the second sub-component is the same as the base material of the first wall. The first sub-component and the first wall are welded with the same material, and the second sub-component and the first tab are also welded with the same material. This satisfies the overcurrent requirement and reduces the risk of reduced airtightness of the battery cell caused by welding cracks in the first wall due to welding of different materials between the first wall and the first current collector, thereby improving the reliability of the battery cell.

[0134] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0135] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0136] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0137] The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0138] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0139] Please refer to Figure 2 , Figure 2 The following is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10, wherein the housing 20 is used to house the battery cell 10.

[0140] The housing 20 has an enclosed space inside for accommodating the battery cell 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 21 and a second housing 22, which are interlocked. The first housing 21 and the second housing 22 can have various shapes, such as cuboids or cylinders. The first housing 21 can be a hollow structure open on one side, and the second housing 22 can also be a hollow structure open on one side. The open side of the second housing 22 interlocks with the open side of the first housing 21, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 21 can be a hollow structure open on one side, and the second housing 22 can be a plate-like structure, with the second housing 22 interlocked with the open side of the first housing 21, thus forming a housing 20 with an accommodating space 23.

[0141] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0142] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0143] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a battery cell 10 according to some embodiments of this application; Figure 4This is an exploded view of a battery cell 10 according to some embodiments of this application. The battery cell 10 may include a housing 11, an electrode assembly 12, an end cap 112, electrode terminals 16, and other functional components.

[0144] The casing 111 and the end cap 112 constitute the outer shell 11 of the battery cell 10.

[0145] The housing 111 is a component for housing the electrode assembly 12. The housing 111 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both ends. The housing 111 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The housing 111 can also be in various shapes, such as a cylinder or a cuboid. For example, in... Figure 3 In the middle, the shell 111 is a cylinder.

[0146] End cap 112 is a component that closes onto the opening of housing 111 to isolate the internal environment of battery cell 10 from the external environment. End cap 112 closes onto the opening of housing 111, and end cap 112 and housing 111 together define a sealed space for accommodating electrode assembly 12, electrolyte, and other functional components. The shape of end cap 112 can be adapted to the shape of housing 111. For example, if housing 111 is a cuboid structure, end cap 112 can be a rectangular plate structure adapted to housing 111; or, if housing 111 is a cylindrical structure, end cap 112 can be a circular plate structure adapted to housing 111. The material of end cap 112 can also be various. For example, end cap 112 can be made of metal, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of end cap 112 can be the same as or different from the material of housing 111.

[0147] In the battery cell 10, there can be one or two end caps 112. If the housing 111 is a hollow structure with an opening at one end, one end cap 112 is provided accordingly; if the housing 111 is a hollow structure with openings at both ends, two end caps 112 are provided accordingly, and the two end caps 112 respectively cover the two openings of the housing 111.

[0148] Electrode terminal 16 is a component for inputting or outputting current. Electrode terminal 16 can be insulated from end cover 112, or it can be insulated from the wall portion of housing 111 that is opposite to or intersects with end cover 112. For example, in Figure 3 and Figure 4 In the middle, electrode terminal 16 is disposed on end cap 112.

[0149] In some embodiments, the electrode terminal 16 may be a cylindrical structure or a polygonal prism structure. In some embodiments, the electrode terminal 16 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0150] In some embodiments, the battery cell 10 may further include a first current collector 13, which is used to realize the electrical connection between the end cap 112 and the first tab 121.

[0151] In some embodiments, the battery cell 10 may further include a second current collector 14, which is used to realize the electrical connection between the end cap 112 and the second tab 122.

[0152] This application provides a battery cell 10, which can improve the reliability of the battery cell 10. The specific structure of the battery cell 10 is described in detail below with reference to the accompanying drawings.

[0153] Figure 5 This is a partial cross-sectional view of a battery cell 10 according to some embodiments of this application; Figure 6 This is an exploded view of the first current collector in some embodiments of this application; Figure 7 This is an assembly diagram of the first sub-component 132 and the second sub-component 131 in some embodiments of this application; Figure 8 This is an assembly diagram of the first sub-component 132 and the second sub-component 131 in some other embodiments of this application.

[0154] Reference Figures 5 to 8 This application provides a battery cell 10, which includes a housing 11, electrode terminals 16, an electrode assembly 12, and a first current collector 13. The housing 11 has a first wall 113. The electrode terminals 16 are insulated from the first wall 113. The electrode assembly 12 is housed within the housing 11 and includes a main body 123, a first tab 121, and a second tab 122. The first tab 121 and the second tab 122 have opposite polarities. Along the thickness direction Z of the first wall 113, both the first tab 121 and the second tab 122 are located at the end of the main body 123 facing the first wall 113. The second tab 122 is electrically connected to the electrode terminals 16. The first current collector 13 is used to electrically connect the first wall 113 and the first tab 121. The base material of the first wall 113 is different from the base material of the first tab 121.

[0155] The first current collector 13 includes a first sub-component 132 and a second sub-component 131 that are connected to each other. The base material of the first sub-component 132 is the same as the base material of the first electrode 121. The first sub-component 132 is welded to the first electrode 121. The base material of the second sub-component 131 is the same as the base material of the first wall 113. The second sub-component 131 is welded to the first wall 113.

[0156] Electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The structure of electrode assembly 12 can be varied. For example, electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode, and the main body 123 of electrode assembly 12 is cylindrical. For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0157] The main body 123 is the region where the electrode assembly 12 undergoes a chemical reaction within the battery cell 10. The main body 123 is a structure formed by winding together the region where the positive electrode sheet is coated with a positive active material layer, the separator, and the region where the negative electrode sheet is coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode sheets with opposite polarities to operate. In some embodiments, the thickness direction Z of the first wall 113 can be parallel to the height direction of the electrode assembly 12.

[0158] Along the thickness direction Z of the first wall 113, both the first tab 121 and the second tab 122 are disposed at the end of the main body 123 facing the first wall 113, meaning that the first tab 121 and the second tab 122 are located on the same side of the main body 123, and are tabs on the same side. The first tab 121 and the second tab 122 are used for the positive and negative electrodes of the output or input electrode assembly 12, respectively. If the first tab 121 is used for the positive electrode of the input or output electrode assembly 12, then the first tab 121 can be a component formed by stacking and connecting the areas of the positive electrode sheet that are not coated with the positive electrode active material layer. Correspondingly, if the second tab 122 is used for the negative electrode of the output or input electrode assembly 12, then the second tab 122 can be a component formed by stacking and connecting the areas of the negative electrode sheet that are not coated with the negative electrode active material layer. If the first tab 121 is used as the negative electrode of the output or input electrode assembly 12, then the first tab 121 can be a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with a negative electrode active material layer. Correspondingly, if the second tab 122 is used as the positive electrode of the input or output electrode assembly 12, then the second tab 122 can be a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with a positive electrode active material layer. For example, in the embodiments of this application, the first tab 121 is used as the negative electrode of the output or input electrode assembly 12, and the second tab 122 is used as the positive electrode of the output or input electrode assembly 12.

[0159] Electrode terminal 16 can be insulated from the first wall 113 by an insulating material or component. Electrode terminal 16 can be a positive terminal or a negative terminal. If electrode terminal 16 is electrically connected to the positive terminal lug, electrode terminal 16 outputs a positive electrode; correspondingly, if the first wall 113 is connected to the negative terminal lug, the first wall 113 outputs a negative electrode. If electrode terminal 16 is electrically connected to the negative terminal lug, electrode terminal 16 outputs a negative electrode; correspondingly, if the first wall 113 is connected to the positive terminal lug, the first wall 113 outputs a positive electrode.

[0160] The first wall 113 is a wall portion of the outer shell 11. The first wall 113 can be the aforementioned end cap 112, or the aforementioned bottom wall or side wall of the outer shell 111.

[0161] The first current collector 13 is a component used to realize the electrical connection between the first wall 113 and the first electrode 121, thereby realizing the input and output of current.

[0162] The first current collector 13 includes a first sub-component 132 and a second sub-component 131 that are connected to each other. Understandably, the first current collector 13 consists of two parts, with the first sub-component 132 and the second sub-component 131 being electrically connected. Both the first sub-component 132 and the second sub-component 131 are conductive, and current can be conducted between the first sub-component 132 and the second sub-component 131.

[0163] The fact that the base material of the first sub-component 132 is the same as the base material of the first electrode 121 means that the main material composition of the first sub-component 132 is the same as that of the first electrode 121. However, this does not require that the material of the first sub-component 132 and the material of the first electrode 121 are not completely the same. In other words, in addition to the base material, a small amount of other materials that improve the performance of the first sub-component 132 can be added to the first sub-component 132, and in addition to the base material, a small amount of other materials that improve the performance of the first electrode 121 can be added to the first electrode 121.

[0164] The fact that the base material of the second sub-component 131 is the same as that of the base material of the first wall 113 means that the main material composition of the second sub-component 131 is the same as that of the first wall 113. However, this does not require that the material of the second sub-component 131 and the material of the first wall 113 are not completely the same. In other words, in addition to the base material, a small amount of other materials that improve the performance of the first sub-component 132 can be added to the first sub-component 132. In addition to the base material, a small amount of other materials that improve the performance of the first electrode 121 can also be added to the first electrode 121.

[0165] The different base materials of the first wall 113 and the first electrode 121 mean that the main material composition of the first wall 113 is different from that of the first electrode 121.

[0166] The material of the first sub-component 132 may include, but is not limited to, copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, as long as the base material of the first sub-component 132 is the same as the base material of the first electrode 121. In some embodiments, the first electrode 121 is a negative electrode, and the base material of both the first sub-component 132 and the first electrode 121 is copper.

[0167] The material of the second sub-component 131 can be, but is not limited to, copper, nickel, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, as long as the base material of the second sub-component 131 is the same as the base material of the first wall 113. In some embodiments, the first electrode tab 121 is a negative electrode tab, and the first wall 113 is used to output the negative electrode. In order to meet the requirements of rigidity and welding quality between the first wall 113 and the second sub-component 131, the materials of both the first wall 113 and the second sub-component 131 can be steel. In some embodiments, in order to improve the corrosion resistance of the first wall 113, a plating layer can also be provided on the surface of the first wall 113, for example, nickel plating on the surface of the first wall 113. Correspondingly, the surface of the second sub-component 131 can also be nickel plating or not nickel plating.

[0168] The first sub-component 132 and the second sub-component 131 can be fixedly connected, such as by welding, rolling, hot pressing, riveting, etc. Welding includes, but is not limited to, laser welding and ultrasonic welding. It should be noted that although the first sub-component 132 and the second sub-component 131 are welded from dissimilar materials, cracks may occur during the welding process. However, this will not affect the current flow between the first sub-component 132 and the second sub-component 131 for the first current collector 13. The first current collector 13 can still achieve the electrical connection between the first wall 113 and the first tab 121.

[0169] The first sub-component 132 and the second sub-component 131 can also be detachably connected, such as by snap-fit ​​or bolt connection.

[0170] It should be noted that:

[0171] The base material of the first sub-component 132 is the same as that of the first electrode 121. The thermal expansion coefficients of the first sub-component 132 and the first electrode 121 are close, and their crystal structures are matched. This helps to reduce thermal stress and thermal deformation during and after welding, thereby improving welding quality.

[0172] The base material of the second sub-component 131 is the same as that of the base material of the first wall 113. The electrical and thermal expansion coefficients of the second sub-component 131 and the first wall 113 are close, and the crystal structure is matched. This helps to reduce thermal stress and thermal deformation during and after welding, improve welding quality, and alleviate cracks generated during welding of the first wall 113.

[0173] In the above technical solution, by making the base material of the first sub-component 132 the same as the base material of the first wall 113, and the base material of the second sub-component 131 the same as the base material of the first tab 121, the first sub-component 132 and the first wall 113 are welded with the same material, and the second sub-component 131 and the first tab 121 are also welded with the same material. This satisfies the overcurrent requirement and reduces the risk of welding cracks in the first wall 113 caused by welding with different materials to the first current collector 13, which would reduce the airtightness of the battery cell 10. Therefore, the reliability of the battery cell 10 can be improved.

[0174] In some embodiments, the connection method between the first sub-component 132 and the second sub-component 131 includes one or more of welding, hot pressing, rolling and riveting.

[0175] Reference Figure 6 In some embodiments, the second sub-component 131 is annular. The middle part of the second sub-component 131 is a through hole, and the inner ring of the second sub-component 131 is the wall of the through hole.

[0176] The second sub-component 131 has an inner ring, and the second sub-component 131 is a closed ring structure with its ends connected (e.g., Figure 6 (As shown). The orthographic projection of the second sub-component 131 onto a plane (XY) perpendicular to the first direction can be a circular ring or an elliptical ring. It should be noted that in other embodiments, the second sub-component 131 can also be a ring segment, which refers to a segment on a ring. The second sub-component 131 can also be multiple ring segments spaced apart circumferentially along the first sub-component 132.

[0177] For example, such as Figure 6 As shown, the second sub-component 131 can be a circular annular sheet.

[0178] In the above technical solution, the second sub-component 131 is annular, which not only facilitates the welding of the second sub-component 131 to the first wall 113, but also increases the weldable area between the second sub-component 131 and the first wall 113, which helps to improve the connection stability between the second sub-component 131 and the first wall 113.

[0179] Reference Figure 6 and Figure 7 In some embodiments, the second sub-component 131 is disposed around the first sub-component 132, and the inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132.

[0180] Understandably, the second sub-component 131 is sleeved on the outer periphery of the first sub-component 132, wherein the second sub-component 131 extends circumferentially along the first sub-component 132 to form a closed loop or near a closed loop.

[0181] The second sub-component 131 can be entirely disposed within the inner ring of the first sub-component 132, and the orthographic projection of the first sub-component 132 falls completely within the inner ring of the second sub-component 131 along the thickness direction Z of the first wall 113.

[0182] Optionally, the surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113.

[0183] In the above technical solution, the second sub-component 131 is arranged around the first sub-component 132, and the inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132. In this way, the structure of the first current collector 13 is more compact, and the first sub-component 132 will not occupy the space outside the second sub-component 131. Along the thickness direction Z of the first wall 113, the second sub-component 131 and the first sub-component 132 can share a part of the size, reducing the space occupied along the thickness direction Z of the first wall 113, allowing the electrode assembly 12 to be larger in the thickness direction Z of the first wall 113, thereby increasing the energy density of the battery cell 10.

[0184] Reference Figure 8 In some embodiments, along the thickness direction Z of the first wall 113, the first sub-component 132 and the second sub-component 131 are stacked, with the second sub-component 131 located between the first wall 113 and the first sub-component 132.

[0185] The first sub-component 132 and the second sub-component 131 are stacked. Understandably, on the same projection plane perpendicular to the first direction, the orthographic projection of the first sub-component 132 overlaps with the orthographic projection of the second sub-component 131. The second sub-component 131 can be connected to the side of the first sub-component 132 facing the first wall 113.

[0186] In this embodiment, the second sub-component 131 includes, but is not limited to, a ring, a ring segment, a sector, etc., for example, in Figure 7 As shown, the second sub-component 131 is annular. On the same projection plane perpendicular to the first direction, the orthographic projection of the first sub-component 132 overlaps with the orthographic projection of the second sub-component 131. The orthographic projection of the second sub-component 131 does not exceed the first sub-component 132.

[0187] In the above technical solution, the first sub-component 132 and the second sub-component 131 are stacked: on the one hand, it facilitates the connection between the second sub-component 131 and the first sub-component 132, which helps to improve the connection reliability between the first sub-component 132 and the second sub-component 131; on the other hand, during the welding process between the second sub-component 131 and the first wall 113, the first sub-component 132 can support the second sub-component 131, which helps to improve the welding reliability between the second sub-component 131 and the first wall 113.

[0188] contrast Figure 7 and Figure 8 ,compared to Figure 8 The embodiment shown, Figure 7 The embodiment shown has a smaller thickness of the first current collector 13, which helps to save dimensions along the thickness direction Z of the first wall 113 and improves the space utilization of the battery cell 10 in the thickness direction Z of the first wall 113.

[0189] compared to Figure 7 The embodiment shown, Figure 8 The first current collector 13 obtained by the embodiment shown occupies a smaller size in a plane (XY plane) perpendicular to the thickness direction Z of the first wall 113, which is particularly helpful for use in cylindrical battery cells 10 with limited radial dimensions.

[0190] Figure 9 This is an assembly diagram of the first current collector, the second current collector, and the insulating member 15 according to some embodiments of this application; Figure 10 This is a schematic diagram of the structure of a first current collector, a second current collector, and an insulating member 15 from one perspective, according to some embodiments of this application. Figure 11 This is a schematic diagram of the structure of the first current collector, the second current collector, and the insulating member 15 from another perspective, representing some embodiments of this application.

[0191] Reference Figures 9 to 11 and in conjunction with reference Figure 5 In some embodiments, the battery cell 10 further includes a second current collector 14 for electrically connecting the electrode terminal 16 and the second tab 122.

[0192] The second current collector 14 is a component that enables the electrical connection between the electrode terminal 16 and the second tab 122. The connection method between the second current collector 14 and the second tab 122 includes, but is not limited to, bonding, welding, riveting, etc., as long as it satisfies the current flow requirement between the second current collector 14 and the second tab 122. Alternatively, the electrode terminal 16 and the second tab 122 are respectively welded to the second current collector 14.

[0193] The material of the second current collector 14 may include, but is not limited to, copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, as long as it can meet the electrical connection between the electrode terminal 16 and the second tab 122. In some embodiments, the second tab 122 is a negative tab, the electrode terminal 16 is used to output a positive electrode, and the base material of the second current collector 14 is aluminum.

[0194] It should be noted that the first current collector 13 and the second current collector 14 should be mutually insulated. The first current collector 13 and the second current collector 14 can be spaced apart to insulate each other. In order to improve the insulation effect, the first current collector 13 and the second current collector 14 can also be mutually insulated by insulating components.

[0195] In the above technical solution, the second current collector 14 makes it easier to electrically connect the electrode terminal 16 to the second tab 122.

[0196] Reference Figures 9 to 11 and in conjunction with reference Figure 5 In some embodiments, the battery cell 10 further includes an insulating member 15 located between the electrode assembly 12 and the first wall 113, and the insulating member 15 insulatingly isolates the first current collector 13 and the second current collector 14.

[0197] Insulator 15 is a component used to insulate the first current collector 13 from the second current collector 14. At least a portion of the insulator 15 is located between the first current collector 13 and the second current collector 14 so that the first current collector 13 and the second current collector 14 are not short-circuited.

[0198] The materials of the insulating component 15 include, but are not limited to, rubber, silicone, and plastic.

[0199] In the above technical solution, the insulating component 15 isolates the first current collector 13 and the second current collector 14, which can reduce the risk of short circuit between the first current collector 13 and the second current collector 14 and improve the reliability of the battery cell 10.

[0200] Reference Figure 10 and Figure 11 In some embodiments, along the thickness direction Z of the first wall 113, at least a portion of the first sub-component 132 is located on the side of the insulator 15 facing the first wall 113, and at least a portion of the second current collector 14 is located on the side of the insulator 15 away from the first wall 113.

[0201] Optionally, along the thickness direction Z of the first wall 113, the first sub-component 132 is disposed between the insulating member 15 and the first wall 113, the second sub-component 131 is also disposed between the insulating member 15 and the first wall 113, and the second current collector 14 is disposed between the main body 123 of the electrode assembly 12 and the insulating member 15.

[0202] Optionally, the insulating element 15 is an insulating sheet, and the insulating element 15 is a thin sheet with a small thickness.

[0203] In the above technical solution, at least a portion of the first sub-component 132 is located on the side of the insulating member 15 facing the first wall 113, and at least a portion of the second current collector 14 is located on the side of the insulating member 15 away from the first wall 113. In this way, the first sub-component 132 and the second current collector 14 are located at least on opposite sides of the insulating member 15, which can greatly reduce the short circuit risk of the first sub-component 132 and the second current collector.

[0204] In some embodiments, the insulating member 15 is provided with a first through hole 151 and a second through hole 152, both of which penetrate the insulating member 15 along the thickness direction Z of the first wall 113. A portion of the first sub-component 132 is accommodated in the first through hole 151 and connected to the first electrode tab 121; a portion of the second current collector 14 is accommodated in the second through hole 152 and connected to the electrode terminal 16.

[0205] The first through hole 151 and the second through hole 152 are structures that connect both sides of the insulating member 15 in the thickness direction Z. In some embodiments, refer to Figure 10 The first through hole 151 and the second through hole 152 can be set at intervals.

[0206] The first through hole 151 can be constructed as a round hole, a rectangular hole, an irregularly shaped hole, etc.

[0207] The second through hole 152 can be constructed as a round hole, a rectangular hole, an irregularly shaped hole, etc.

[0208] In the above technical solution, a portion of the first sub-component 132 is accommodated within the first through hole 151, which facilitates the connection between the first sub-component 132 and the first electrode tab 121. A portion of the second current collector 14 is accommodated within the second through hole 152, which facilitates the connection between the second current collector 14 and the electrode terminal 16.

[0209] In some embodiments, along the thickness direction Z of the first wall 113, the first through hole 151 is disposed opposite to the first tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16.

[0210] The first through hole 151 is disposed opposite to the first electrode tab 121. That is, the position of the first through hole 151 is related to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the second electrode tab 122 covers part or completely covers the first through hole 151, so that the part of the first sub-component 132 accommodated in the first through hole 151 can be conveniently connected to the first electrode tab 121.

[0211] The second through hole 152 is disposed opposite to the electrode terminal 16, that is, the opening position of the second through hole 152 is related to the electrode terminal 16, so that the part of the second current collector 14 accommodated in the second through hole 152 is convenient for the electrode terminal 16 to be connected. Along the thickness direction Z of the first wall 113, the projection of the electrode terminal 16 covers part or completely covers the second through hole 152, so that the part of the second current collector 14 accommodated in the second through hole 152 is convenient for the second tab 122 to be connected.

[0212] In the above technical solution, the first through hole 151 is arranged opposite to the first electrode tab 121, so that the portion of the first sub-component 132 accommodated in the first through hole 151 can be opposite to the first electrode tab 121, thereby alleviating the stress concentration caused by the misalignment connection between the first electrode tab 121 and the first sub-component 132.

[0213] The second through hole 152 is disposed opposite to the electrode terminal 16, so that the portion of the second current collector 14 housed in the second through hole 152 can be opposite to the electrode terminal 16, thereby alleviating the stress concentration caused by the misalignment between the second current collector 14 and the electrode terminal 16.

[0214] Reference Figure 10 In some embodiments, the insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155. Another portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. A second through hole 152 is disposed in the first main body portion 156.

[0215] The first peripheral portion 155 can be a closed ring connected end to end. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the first main body portion 156 falls into the inner ring of the ring. In order to improve the structural strength of the insulating component 15, the area of ​​the first main body portion 156 can exceed half of the circle. The inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 can form a fan-shaped second through hole 152.

[0216] By setting the first peripheral portion 155 as an annular shape, an insulating component 15 with more uniform stress distribution and stronger bending resistance can be obtained.

[0217] The first main body 156 is disposed within the first peripheral portion 155, and the first main body 156 is connected to a portion of the inner periphery of the first peripheral portion 155. On the one hand, this makes the structure of the insulating member 15 more compact, which helps to reduce the size of the insulating member 15 and improve the space utilization of the battery cell 10. On the other hand, the first main body 156 can strengthen the structural strength of the first peripheral portion 155 and obtain an insulating member 15 with higher structural strength.

[0218] Another part of the inner periphery of the first outer peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151, reducing the number of openings in the first main body portion 156.

[0219] Reference Figure 10 In some embodiments, the first sub-component 132 is provided with a third through hole 1323. The third through hole 1323 penetrates the first sub-component 132 along the thickness direction Z of the first wall 113. The first main body portion 156 protrudes toward the first wall 113 relative to the first peripheral portion 155. At least a portion of the first main body portion 156 is located within the third through hole 1323.

[0220] The third through hole 1323 penetrates the first sub-component 132, that is, the third through hole 1323 connects the two sides of the first sub-component 132 in the thickness direction Z.

[0221] The first main body portion 156 protrudes toward the first wall 113 relative to the first peripheral portion 155, meaning that the surface of the first main body portion 156 facing the first wall 113 is not coplanar with the surface of the first peripheral portion 155 facing the first wall 113. The surface of the first main body portion 156 facing the first wall 113 is closer to the first wall 113 than the surface of the first peripheral portion 155 facing the first wall 113.

[0222] At least a portion of the first main body 156 is located within the third through hole 1323. The third through hole 1323 can limit the first main body 156, thereby mitigating the movement of the insulating member 15 within the battery cell 10 and improving the insulation reliability of the insulating member 15.

[0223] Figure 12 This is a schematic diagram of the structure of the second sub-component 131 in some embodiments of this application.

[0224] Reference Figure 12 and in conjunction with reference Figure 10 In some embodiments, the first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular, and at least a portion of the second peripheral portion 1321 is located on the side of the insulating member 15 facing the first wall 113 and is connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321, and the second main body portion 1322 is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. At least a portion of the second main body portion 1322 is located within the first through hole 151 and is connected to the first tab 121.

[0225] The second outer periphery 1321 can be a closed ring connected end to end. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second main body 1322 falls into the inner ring of the second outer periphery 1321, and the orthographic projection of the second main body 1322 falls into the first through hole 151. The second main body 1322 can be constructed in a fan shape to adapt to the fan-shaped first through hole 151.

[0226] By constructing the second outer periphery 1321 as a ring, a first sub-component 132 with more uniform stress distribution and stronger bending resistance can be obtained.

[0227] The second main body 1322 is disposed within the second peripheral portion 1321, and the second main body 1322 is connected to a portion of the inner periphery of the second peripheral portion 1321. On the one hand, this makes the structure of the first sub-component 132 more compact, which helps to reduce the size of the first sub-component 132 and improve the space utilization of the battery cell 10. On the other hand, the second main body 1322 can strengthen the structural strength of the second peripheral portion 1321, resulting in a first sub-component 132 with higher structural strength.

[0228] Another part of the inner periphery of the second outer portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323, which reduces the number of openings in the second main body portion 1322.

[0229] Figure 13 This is a schematic diagram of the structure of the insulating element 15 in some embodiments of this application.

[0230] Reference Figure 13 and Figure 12 In some embodiments, the wall of the first through hole 151 is provided with a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 is provided with a second stepped surface 13221, the second stepped surface 13221 abutting against the first stepped surface 1511.

[0231] The first through hole 151 can be a stepped hole, forming a first stepped surface 1511 on the hole wall. The hole wall of the first through hole 151 can also be provided with a flange to form the first stepped surface 1511. The first stepped surface 1511 can extend circumferentially around the first through hole 151, or it can extend a portion circumferentially around the first through hole 151. For example, the first through hole 151 is a stepped hole, comprising a first hole segment and a second hole segment. The first hole segment is closer to the first wall 113 than the second hole segment, and the cross-sectional area of ​​the first hole segment is larger than that of the second hole segment. A first stepped surface 1511 is formed between the first hole segment and the second hole segment.

[0232] It is understood that the outer peripheral surface of the second main body 1322 has a step. Specifically, the second main body 1322 may include a first part and a second part. The second part is further away from the first wall 113 than the first part. Along the thickness direction Z of the first wall 113, the cross-section of the second part is smaller than that of the first part, so that a second step surface 13221 is formed between the first part and the second part. The second step surface 13221 may extend around the circumference of the second part, or it may extend a section along the circumference of the second part.

[0233] For example, such as Figure 12 As shown, the second main body portion 1322 is fan-shaped, having an inner side near the center and an outer side away from the center. The second stepped surface 13221 includes two first arcuate surfaces 13221a and a second arcuate surface 13221b. The first arcuate surface 13221a is near the inner circle of the second main body portion 1322, and the second arcuate surface 13221b is near the outer circle of the second main body portion 1322. For example, as... Figure 13 As shown, the first through hole 151 is fan-shaped, and the first stepped surface 1511 has a third arc surface 1511a and a fourth arc surface 1511b corresponding to the second stepped surface 13221. The third arc surface 1511a is disposed on the inner circle of the first through hole 151, and the fourth arc surface 1511b is disposed on the outer circle of the first through hole 151. The third arc surface 1511a abuts against the first arc surface 13221a, and the fourth arc surface 1511b abuts against the second arc surface 13221b.

[0234] In the above technical solution, the wall of the first through hole 151 is provided with a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 is provided with a second stepped surface 13221. By abutting the second stepped surface 13221 with the first stepped surface 1511, the assembly stability of the first sub-component 132 and the insulating component 15 can be improved.

[0235] Reference Figure 10 and in conjunction with reference Figure 11 and Figure 5 In some embodiments, such as Figure 10 As shown, the second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is connected to the electrode terminal 16. At least a portion of the protrusion 142 is accommodated in the second through hole 152. The third main body 141 is connected to the second tab 122. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the insulating member 15 completely covers the orthographic projection of the third main body 141.

[0236] The protrusion 142 may be partially or completely accommodated in the second through hole 152. In some embodiments, the protrusion 142 is accommodated in the second through hole 152 and extends beyond the surface of the first body portion 156 facing the first wall 113 to facilitate the connection between the electrode terminal 16 and the second current collector 14.

[0237] By having the orthographic projection of the insulating member 15 completely cover the orthographic projection of the third main body 141 on the same projection plane perpendicular to the thickness direction Z of the first wall 113, the possibility of the third main body 141 contacting the first wall 113 is reduced, which can greatly reduce the risk of short circuit between the second current collector 14 and the first wall 113.

[0238] Reference Figure 11 In some embodiments, a first groove 153 is provided on the side of the first main body 156 away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153.

[0239] The third main body 141 can be partially accommodated in the first groove 153, or the third main body 141 can be fully accommodated in the first groove 153.

[0240] In an embodiment where the third body portion 141 is configured in a fan shape, the first groove 153 may be configured in a fan shape to adapt to the third body portion.

[0241] At least a portion of the third main body 141 is accommodated in the first groove 153, and the third main body 141 and the insulating member 15 can share a portion of the space, thereby improving the space utilization rate of the battery cell 10.

[0242] Figure 14 This is an assembly diagram of the first current collector, the second current collector, and the insulating member 15 according to other embodiments of this application; Figure 15 This is a schematic diagram of the structure of the first current collector, the second current collector, and the insulating member 15 from one perspective, according to some other embodiments of this application. Figure 16 This is a schematic diagram of the first current collector, the second current collector, and the insulating member 15 from another perspective, representing some other embodiments of this application. Figure 17 This is a structural schematic diagram of the second sub-component 131 in some other embodiments of this application.

[0243] Reference Figures 14 to 17 In some embodiments, a second groove 1324 is provided on the side of the second peripheral portion 1321 opposite to the first wall 113, and at least a portion of the insulating member 15 is accommodated in the second groove 1324.

[0244] Among them, reference Figure 13The second groove 1324 can be constructed as an annular shape, and the second main body portion 1322 is located in the inner circle of the second groove 1324. In some embodiments, the first main body portion 156 is accommodated in the inner circle of the second groove 1324, and the outer periphery of the first main body portion 156 contacts the groove wall of the second groove 1324.

[0245] By accommodating at least a portion of the insulating member 15 in the second groove 1324, the second groove 1324 can limit the insulating member 15, thereby improving the assembly stability of the second sub-component 131 and the insulating member 15.

[0246] In some other embodiments of the insulating member 15, the first body may not protrude from the first peripheral portion 155, see reference 155. Figure 15 ,and Figure 10 The insulating element 15 shown is different in that, Figure 15 In this design, there is no step between the first body and the first peripheral part 155. The surface of the first body facing the first wall 113 is coplanar with the surface of the first peripheral part 155 facing the first wall 113. The surface of the insulating part 15 facing the first wall 113 is flat, which reduces the processing difficulty of the insulating part 15.

[0247] Figure 18 This is an assembly diagram of the first current collector, the second current collector, and the insulating member 15 according to some embodiments of this application; Figure 19 for Figure 18 Sectional view along AA; Figure 20 for Figure 19 Enlarged view of section A in the middle; Figure 21 This is an assembly diagram of the first current collector, the second current collector, and the insulating member 15 in some embodiments of this application; Figure 22 for Figure 21 A cross-sectional view along BB; Figure 23 for Figure 22 Enlarged view of section B in the middle.

[0248] Reference Figures 18 to 23 and in conjunction with reference Figure 17 In some embodiments, on the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating member 15.

[0249] In some embodiments, refer to Figure 10 On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the first sub-component 132 extends beyond the outer edge of the orthographic projection of the insulating member 15, the orthographic projection of the inner circle of the second sub-component 131 coincides with the orthographic projection of the outer edge of the insulating member 15, and the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating member 15.

[0250] In some embodiments, refer to Figure 23 The second sub-component 131 is sleeved on the outer edge of the first sub-component 132. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, there is a gap between the orthographic projection of the second sub-component 131 and the orthographic projection of the insulating member 15.

[0251] In the above technical solution, on the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 and the orthographic projection of the insulating component 15 do not overlap, which can reduce the risk of the insulating component 15 being burned by welding energy during the welding process of the first wall 113 and the second sub-component 131.

[0252] In some embodiments, the base material of the first tab 121 is copper, and the base material of the first wall 113 is steel.

[0253] In some embodiments, the battery cell 10 is cylindrical.

[0254] This application also provides a battery device 100, which includes the battery cell 10 provided in any of the above embodiments.

[0255] This application embodiment also provides an electrical device, which includes the battery device 100 provided in any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0256] Reference Figures 3 to 7 , Figure 10 , Figure 11 , Figures 18 to 20This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. The first main body 156 protrudes towards the first wall 113 relative to the first peripheral portion 155. The first main body 156 is accommodated in the third through hole 1323. The second sub-component 131 is annular and surrounds the first sub-component 132. The inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating member 15.

[0257] Reference Figures 3 to 7 , Figures 10 to 12 , Figures 18 to 20This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. The surface of the first main body 156 facing the first wall 113 is coplanar with the surface of the first peripheral part 155 facing the first wall 113. The second sub-component 131 is annular and surrounds the first sub-component 132, with its inner periphery connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The wall of the first through hole 151 has a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 has a second stepped surface 13221, which abuts against the first stepped surface 1511. The first through hole 151 is a stepped hole, which includes a first hole segment and a second hole segment. The first hole segment is closer to the first wall 113 than the second hole segment. The cross-sectional area of ​​the first hole segment is larger than that of the second hole segment. A first step surface 1511 is formed between the first hole segment and the second hole segment. The second main body 1322 may include a first part and a second part. The second part is further away from the first wall 113 than the first part. Along the thickness direction Z of the first wall 113, the cross-section of the second part is smaller than that of the first part, so that a second step surface 13221 is formed between the first part and the second part. The second main body 1322 has an inner side near the center and an outer side away from the center. The second step surface 13221 includes two first arc surfaces 13221a and a second arc surface 13221b. The first arc surface 13221a is close to the inner circle of the second main body 1322, and the second arc surface 13221b is close to the outer circle of the second main body 1322. The first through hole 151 is fan-shaped. The first step surface 1511 has a third arc surface 1511a and a fourth arc surface 1511b corresponding to the second step surface 13221. The third arc surface 1511a is disposed on the inner circle of the first through hole 151, and the fourth arc surface 1511b is disposed on the outer circle of the first through hole 151.The third arc surface 1511a abuts against the first arc surface 13221a, and the fourth arc surface 1511b abuts against the second arc surface 13221b. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating component 15.

[0258] Reference Figures 3 to 7 , Figure 10 and Figure 11 , Figures 21 to 23This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. The surface of the first main body 156 facing the first wall 113 is coplanar with the surface of the first peripheral part 155 facing the first wall 113. The second sub-component 131 is annular and surrounds the first sub-component 132, with its inner periphery connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The wall of the first through hole 151 has a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 has a second stepped surface 13221, which abuts against the first stepped surface 1511. The first through hole 151 is a stepped hole, which includes a first hole segment and a second hole segment. The first hole segment is closer to the first wall 113 than the second hole segment. The cross-sectional area of ​​the first hole segment is larger than that of the second hole segment. A first step surface 1511 is formed between the first hole segment and the second hole segment. The second main body 1322 may include a first part and a second part. The second part is further away from the first wall 113 than the first part. Along the thickness direction Z of the first wall 113, the cross-section of the second part is smaller than that of the first part, so that a second step surface 13221 is formed between the first part and the second part. The second main body 1322 has an inner side near the center and an outer side away from the center. The second step surface 13221 includes two first arc surfaces 13221a and a second arc surface 13221b. The first arc surface 13221a is close to the inner circle of the second main body 1322, and the second arc surface 13221b is close to the outer circle of the second main body 1322. The first through hole 151 is fan-shaped. The first step surface 1511 has a third arc surface 1511a and a fourth arc surface 1511b corresponding to the second step surface 13221. The third arc surface 1511a is disposed on the inner circle of the first through hole 151, and the fourth arc surface 1511b is disposed on the outer circle of the first through hole 151.The third arc surface 1511a abuts against the first arc surface 13221a, and the fourth arc surface 1511b abuts against the second arc surface 13221b. A second groove 1324 is provided on the side of the second peripheral portion 1321 facing away from the first wall 113. The second groove 1324 is annular in structure, and at least a portion of the insulating member 15 is accommodated within the inner circle of the second main body portion 1324. The outer diameter of the second main body portion 1322 is larger than the outer diameter of the main body portion 123. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating member 15, and there is a gap between the orthographic projection of the second sub-component 131 and the orthographic projection of the insulating member 15.

[0259] Reference Figures 3 to 6 , Figures 10 to 11This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. Along the thickness direction Z of the first wall 113, the second sub-component 131 and the second peripheral portion 1321 are stacked together. The second sub-component 131 is located between the second peripheral portion 1321 and the first sub-component 132, and the outer diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The first main body portion 156 protrudes towards the first wall 113 relative to the first peripheral portion 155, and the first main body portion 156 is accommodated in the third through hole 1323. The second sub-component 131 is annular and surrounds the first sub-component 132. The inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating component 15.

[0260] Reference Figures 3 to 6 , Figures 10 to 13This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. Along the thickness direction Z of the first wall 113, the second sub-component 131 and the second peripheral portion 1321 are stacked together. The second sub-component 131 is located between the second peripheral portion 1321 and the first sub-component 132, and the outer diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The surface of the first main body portion 156 facing the first wall 113 is coplanar with the surface of the first peripheral portion 155 facing the first wall 113. The second sub-component 131 is annular and surrounds the first sub-component 132. The inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The wall of the first through hole 151 is provided with a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 is provided with a second stepped surface 13221, which abuts against the first stepped surface 1511. The first through hole 151 is a stepped hole, which includes a first hole segment and a second hole segment. The first hole segment is closer to the first wall 113 than the second hole segment, and the cross-sectional area of ​​the first hole segment is larger than that of the second hole segment. The first stepped surface 1511 is formed between the first hole segment and the second hole segment.The second main body 1322 may include a first part and a second part. The second part is further away from the first wall 113 than the first part. Along the thickness direction Z of the first wall 113, the cross-section of the second part is smaller than that of the first part, so that a second step surface 13221 is formed between the first part and the second part. The second main body 1322 has an inner side near the center and an outer side away from the center. The second step surface 13221 includes two first arc surfaces 13221a and a second arc surface 13221b. The first arc surface 13221a is close to the inner circle of the second main body 1322, and the second arc surface 13221b is close to the outer circle of the second main body 1322. The first through hole 151 is fan-shaped. The first step surface 1511 has a third arc surface 1511a and a fourth arc surface 1511b corresponding to the second step surface 13221. The third arc surface 1511a is disposed on the inner circle of the first through hole 151, and the fourth arc surface 1511b is disposed on the outer circle of the first through hole 151. The third arc surface 1511a abuts against the first arc surface 13221a, and the fourth arc surface 1511b abuts against the second arc surface 13221b. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating component 15.

[0261] Reference Figures 3 to 6 , Figure 10 , Figures 13 to 17This application also provides a cylindrical battery cell 10, which includes a casing 11, an electrode assembly 12, a first current collector 13, a second current collector 14, electrode terminals 16, and an insulating member 15. The casing 11 includes a housing 111 and a first wall 113. The housing 111 is cylindrical and has an opening at one end along the axial direction of the battery cell 10. The first wall 113 covers the opening. The base material of the casing 11 is steel, and the surface of the casing 11 is nickel-plated. The electrode assembly 12 is housed within the casing 11. The electrode assembly 12 includes a main body 123 and two tabs disposed on the same side of the main body 123 facing the first wall 113. The two tabs are a first tab 121 and a second tab 122. The first tab 121 is a negative tab, and its base material is copper. The second tab 122 is a positive tab, and its base material is aluminum. The electrode terminals 16 are insulated from the first wall 113. An insulating member 15 is disposed between the first wall 113 and the electrode assembly 12. The insulating member 15 includes a first peripheral portion 155 and a first main body portion 156. The first peripheral portion 155 is annular, and the first main body portion 156 is disposed within the first peripheral portion 155. The first main body portion 156 is connected to a portion of the inner periphery of the first peripheral portion 155, and the other portion of the inner periphery of the first peripheral portion 155 and the edge of the first main body portion 156 form a first through hole 151. The first main body portion 156 is provided with a second through hole 152. Along the thickness direction Z of the first wall 113, both the first through hole 151 and the second through hole 152 penetrate the insulating member 15. The first through hole 151 is disposed opposite to the first electrode tab 121, and the second through hole 152 is disposed opposite to the electrode terminal 16. The second current collector 14 is disposed on the side of the insulating member 15 facing away from the first wall 113. The second current collector 14 includes a third main body 141 and a protrusion 142. The protrusion 142 protrudes from the side of the third main body 141 facing the first wall 113 and is welded to the electrode terminal 16. The protrusion 142 is accommodated in the second through hole 152. The third main body 141 is welded to the second electrode tab 122. A first groove 153 is provided on the side of the first main body 156 facing away from the first wall 113, and at least a portion of the third main body 141 is accommodated in the first groove 153. On the same projection plane in the thickness direction Z perpendicular to the first wall 113, the orthographic projection of the first main body 156 completely covers the orthographic projection of the third main body 141. The first current collector 13 includes a first sub-component 132 and a second sub-component 131 connected to each other. The base material of the first sub-component 132 is steel, and the base material of the second sub-component 131 is copper. The first sub-component 132 is connected to the second sub-component 131. The first sub-component 132 is welded to the first wall 113, and the second sub-component 131 is welded to the first electrode lug 121.The first sub-component 132 is disposed on the side of the insulating member 15 facing the first wall 113. The first sub-component 132 includes a second peripheral portion 1321 and a second main body portion 1322. The second peripheral portion 1321 is annular and connected to the second sub-component 131. The second main body portion 1322 is disposed within the second peripheral portion 1321 and is connected to a portion of the inner periphery of the second peripheral portion 1321. Another portion of the inner periphery of the second peripheral portion 1321 and the edge of the second main body portion 1322 form a third through hole 1323. The second main body portion 1322 protrudes from the second peripheral portion 1321 away from the first wall 113. The second main body portion 1322 is located within the first through hole 151 and is welded to the first electrode tab 121. Along the thickness direction Z of the first wall 113, the projection of the first main body portion 156 covers the third through hole 1323. Along the thickness direction Z of the first wall 113, the second sub-component 131 and the second peripheral portion 1321 are stacked together. The second sub-component 131 is located between the second peripheral portion 1321 and the first sub-component 132, and the outer diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The surface of the first main body portion 156 facing the first wall 113 is coplanar with the surface of the first peripheral portion 155 facing the first wall 113. The second sub-component 131 is annular and surrounds the first sub-component 132. The inner periphery of the second sub-component 131 is connected to the outer edge of the first sub-component 132. The surface of the second sub-component 131 facing the first wall 113 is coplanar with the surface of the first sub-component 132 facing the first wall 113. The inner diameter of the second sub-component 131 is equal to the outer diameter of the first sub-component 132. The wall of the first through hole 151 is provided with a first stepped surface 1511, and the outer peripheral surface of the second main body 1322 is provided with a second stepped surface 13221, which abuts against the first stepped surface 1511. The first through hole 151 is a stepped hole, which includes a first hole segment and a second hole segment. The first hole segment is closer to the first wall 113 than the second hole segment, and the cross-sectional area of ​​the first hole segment is larger than that of the second hole segment. The first stepped surface 1511 is formed between the first hole segment and the second hole segment.The second main body 1322 may include a first part and a second part. The second part is further away from the first wall 113 than the first part. Along the thickness direction Z of the first wall 113, the cross-section of the second part is smaller than that of the first part, so that a second step surface 13221 is formed between the first part and the second part. The second main body 1322 has an inner side near the center and an outer side away from the center. The second step surface 13221 includes two first arc surfaces 13221a and a second arc surface 13221b. The first arc surface 13221a is close to the inner circle of the second main body 1322, and the second arc surface 13221b is close to the outer circle of the second main body 1322. The first through hole 151 is fan-shaped. The first step surface 1511 has a third arc surface 1511a and a fourth arc surface 1511b corresponding to the second step surface 13221. The third arc surface 1511a is disposed on the inner circle of the first through hole 151, and the fourth arc surface 1511b is disposed on the outer circle of the first through hole 151. The third arc surface 1511a abuts against the first arc surface 13221a, and the fourth arc surface 1511b abuts against the second arc surface 13221b. A second groove 1324 is provided on the side of the second peripheral portion 1321 facing away from the first wall 113. The second groove 1324 is annular in structure, and at least a portion of the insulating member 15 is accommodated within the inner circle of the second main body portion 1324. The outer diameter of the second main body portion 1322 is larger than the outer diameter of the main body portion 123. On the same projection plane perpendicular to the thickness direction Z of the first wall 113, the orthographic projection of the second sub-component 131 does not overlap with the orthographic projection of the insulating member 15, and there is a gap between the orthographic projection of the second sub-component 131 and the orthographic projection of the insulating member 15.

[0262] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0263] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has a first wall; Electrode terminals are insulated from the first wall; An electrode assembly is housed within the housing. The electrode assembly includes a main body, a first electrode tab, and a second electrode tab. The first electrode tab and the second electrode tab have opposite polarities. Along the thickness direction of the first wall, both the first electrode tab and the second electrode tab are disposed at the end of the main body facing the first wall. The second electrode tab is electrically connected to the electrode terminal. The first current collector is used to electrically connect the first wall and the first electrode tab, wherein the base material of the first wall is different from the base material of the first electrode tab; The first current collector includes a first sub-component and a second sub-component connected to each other. The base material of the first sub-component is the same as the base material of the first electrode tab, and the first sub-component is welded to the first electrode tab. The base material of the second sub-component is the same as the base material of the first wall, and the second sub-component is welded to the first wall.

2. The battery cell according to claim 1, characterized in that, The connection method between the first sub-component and the second sub-component includes one or more of welding, hot pressing, rolling and riveting.

3. The battery cell according to claim 1, characterized in that, The second sub-component is ring-shaped.

4. The battery cell according to claim 3, characterized in that, The second sub-component is disposed around the first sub-component, and the inner periphery of the second sub-component is connected to the outer edge of the first sub-component.

5. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the first sub-component and the second sub-component are stacked, with the second sub-component located between the first wall and the first sub-component.

6. The battery cell according to any one of claims 1-5, characterized in that, The battery cell also includes: The second current collector is used to electrically connect the electrode terminal to the second tab.

7. The battery cell according to claim 6, characterized in that, The battery cell also includes: An insulating element is located between the electrode assembly and the first wall, the insulating element insulatingly isolating the first current collector and the second current collector.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the first wall, at least a portion of the first sub-component is located on the side of the insulator facing the first wall, and at least a portion of the second current collector is located on the side of the insulator away from the first wall.

9. The battery cell according to claim 8, characterized in that, The insulating component is provided with a first through hole and a second through hole, and both the first through hole and the second through hole penetrate the insulating component along the thickness direction of the first wall; A portion of the first sub-component is housed within the first through hole and is connected to the first electrode tab; A portion of the second current collector is housed within the second through hole and is connected to the electrode terminal.

10. The battery cell according to claim 9, characterized in that, Along the thickness direction of the first wall, the first through hole is disposed opposite to the first electrode tab, and the second through hole is disposed opposite to the electrode terminal.

11. The battery cell according to claim 9, characterized in that, The insulating component includes: The first outer perimeter is ring-shaped; A first main body is disposed within the first peripheral portion. The first main body is connected to a portion of the inner periphery of the first peripheral portion. Another portion of the inner periphery of the first peripheral portion and the edge of the first main body form the first through hole. The second through hole is disposed in the first main body.

12. The battery cell according to claim 11, characterized in that, The first sub-component is provided with a third through hole, which penetrates the first sub-component along the thickness direction of the first wall; The first main body portion protrudes toward the first wall relative to the first peripheral portion, and at least a portion of the first main body portion is located within the third through hole.

13. The battery cell according to claim 12, characterized in that, The first sub-component includes: The second peripheral portion is annular and at least a portion of the second peripheral portion is located on the side of the insulating member facing the first wall and is connected to the second sub-component; The second main body is disposed within the second peripheral portion. The second main body is connected to a portion of the inner periphery of the second peripheral portion. Another portion of the inner periphery of the second peripheral portion and the edge of the second main body form a third through hole. At least a portion of the second main body is located within the first through hole and is connected to the first electrode tab.

14. The battery cell according to claim 13, characterized in that, The wall of the first through hole is provided with a first stepped surface, and the outer peripheral surface of the second main body is provided with a second stepped surface, which abuts against the first stepped surface.

15. The battery cell according to claim 13, characterized in that, The second current collector includes a third main body and a protrusion. The protrusion protrudes from the side of the third main body facing the first wall. The protrusion is connected to the electrode terminal. At least a portion of the protrusion is accommodated in the second through hole. The third main body is connected to the second electrode tab. On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the insulating element completely covers the orthographic projection of the third main body.

16. The battery cell according to claim 15, characterized in that, The first main body portion has a first groove on the side opposite to the first wall, and at least a portion of the third main body portion is accommodated in the first groove.

17. The battery cell according to claim 13, characterized in that, The second peripheral portion has a second groove on the side opposite to the first wall, and at least a portion of the insulating member is accommodated in the second groove.

18. The battery cell according to claim 7, characterized in that, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second sub-component does not overlap with the orthographic projection of the insulating component.

19. The battery cell according to any one of claims 1-5, characterized in that, The base material of the first electrode tab is copper, and the base material of the first wall is steel.

20. The battery cell according to any one of claims 1-5, characterized in that, The battery cell is cylindrical.

21. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-20.

22. An electrical appliance, characterized in that, Includes the battery device of claim 21, the battery device being used to provide electrical energy.

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