Cover plate assembly, battery monomer, battery device and power utilization device

Abstract

The utility model provides a cover plate assembly, a battery monomer, a battery device and a power utilization device, a shell in the battery monomer comprises a wall part provided with an electrode lead-out hole, an electrode assembly is arranged in the shell, an electrode terminal penetrates through the electrode lead-out hole, a first part is arranged on a first side of the wall part and covers the electrode lead-out hole, and a second part is arranged on a second side of the wall part. The electrode terminal is electrically connected with the electrode assembly; at least part of the first insulating part is arranged between the first part and the wall part, and the wall part is in concave-convex fit with the first insulating part. In the above structure, because the first insulating part arranged between the first part and the wall part is matched with the wall part in a concave-convex manner, the electrode terminal and the wall part can be positioned through the matching of the first insulating part and the wall part, the possibility of rotation of the electrode terminal on the wall part is reduced, the possibility of loosening of the electrode terminal is reduced, and the reliability of the electrode terminal is improved. And the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0003] As the application scope of batteries becomes wider and wider, how to improve the reliability of batteries has attracted more and more attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, wherein the battery cell has good reliability.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a first insulating member, the shell including a wall portion, the wall portion being provided with an electrode lead-out hole; the electrode assembly is arranged in the shell; the electrode terminal passes through the electrode lead-out hole, the electrode terminal including a first part, the first part being arranged on a first side of the wall portion and covering the electrode lead-out hole, the electrode terminal being electrically connected to the electrode assembly; at least part of the first insulating member is arranged between the first part and the wall portion, and the wall portion and the first insulating member are matched in a concave-convex manner.

[0006] In the above structure, since the first insulating member arranged between the first part and the wall portion is matched with the wall portion in a concave and convex manner, the electrode terminal and the wall portion can be positioned through the matching of the first insulating member and the wall portion, which reduces the possibility of the electrode terminal rotating on the wall portion, is beneficial to reducing the possibility of the electrode terminal loosening, and improves the reliability of the battery cell.

[0007] According to some embodiments of the present application, a battery cell is provided with a wall portion having a first recessed portion that is recessed inwardly from a side facing the first insulating member. The first insulating member is provided with a first protrusion, and at least a portion of the first protrusion fits within the first recessed portion. By providing the first protrusion to the first insulating member and at least partially fitting and inserting the first protrusion into the first recessed portion, the mating connection between the first protrusion and the first recess can reduce the possibility of the electrode terminal rotating relative to the wall portion.

[0008] According to the battery cell provided in some embodiments of the present application, along the thickness direction of the wall portion, at least a portion of the projection of the first recess is located within the projection range of the first portion.

[0009] According to the battery cell provided in some embodiments of the present application, a plurality of first recesses are provided, and the plurality of first recesses are arranged at intervals.

[0010] According to the battery cell provided in some embodiments of the present application, the plurality of first recesses are arranged at intervals around the central axis of the electrode terminal.

[0011] According to the battery cell provided in some embodiments of the present application, along the radial direction of the electrode terminal, the size of the first recess is d, the size of the first protrusion is D, and dD is ≥ 0.05 mm.

[0012] According to the battery cell provided in some embodiments of the present application, along the thickness direction of the wall portion, the depth of the first recess is w, the height of the first protrusion is W, and wW≥0.03 mm.

[0013] According to the battery cell provided in some embodiments of the present application, along the radial direction of the electrode terminal, the distance between the first recess and the central axis of the electrode terminal is L1, and the maximum distance between the edge of the first insulating member and the central axis of the electrode terminal is L2.

[0014] According to the battery cell provided in some embodiments of the present application, along the radial direction of the electrode terminal, the distance between the first recess and the central axis of the electrode terminal is L1, and L1 is ≥ 3 mm.

[0015] According to the battery cell provided in some embodiments of the present application, the first insulating member extends from between the first portion and the wall portion along a radial direction of the electrode terminal.

[0016] According to the battery cell provided in some embodiments of the present application, the electrode terminal includes a second portion connected to the first portion, and the second portion is disposed on the second side of the wall portion and opposite to the first portion.

[0017] According to some embodiments of the present application, a battery cell is provided with a second protrusion on the side of the wall facing away from the first insulating member. The second protrusion is disposed opposite the first recess. The second portion is provided with a second recess that is recessed inward from the side facing the wall. At least a portion of the second protrusion fits into the second recess. By at least a portion of the second protrusion being fitted and inserted into the second recess, the fit between the second protrusion and the second recess can further reduce the possibility of the electrode terminal rotating relative to the wall.

[0018] According to the battery cell provided in some embodiments of the present application, the battery cell also includes a second insulating member arranged between the wall portion and the second part, and at least a portion of the second insulating member is clamped between the second part and the wall portion, so that the second insulating member can insulate and isolate the wall portion and the components located on the second side of the shell.

[0019] According to the battery cell provided in some embodiments of the present application, the second insulating member includes a main body and an extension portion connected to each other, the main body is connected to the wall, the extension portion extends along the thickness of the wall, and at least part of the extension portion is located between the electrode assembly and the shell.

[0020] According to the battery cell provided in some embodiments of the present application, the electrode terminal includes a first part and a second part, the first part is arranged outside the shell, and at least a part of the second part is arranged inside the shell, the first part and the second part are riveted, at least a part of the first insulating member is clamped between the first part and the wall part, and at least a part of the second insulating member is clamped between the part of the second part located inside the shell and the wall part.

[0021] According to the battery cell provided in some embodiments of the present application, the housing includes a shell and a cover. The shell forms a cavity with an opening. The electrode assembly is arranged in the cavity. The cover covers the opening and is connected to the shell. The cover includes a wall portion.

[0022] In a second aspect, some embodiments of the present application also provide a cover assembly, which includes a cover body, an electrode terminal and a first insulating member, the cover body is provided with an electrode lead-out hole; the electrode terminal passes through the electrode lead-out hole, and at least part of the electrode terminal is located on one side of the cover body and covers the electrode lead-out hole; at least part of the first insulating member is connected between the electrode terminal and the cover body, the cover body is provided with a first recessed portion that is recessed inward from the side facing the first insulating member, and the first insulating member is convexly provided with a first protrusion, and at least part of the first protrusion fits in the first recessed portion.

[0023] In a third aspect, some embodiments of the present application further provide a battery comprising a battery cell provided by any of the aforementioned technical solutions.

[0024] In a fourth aspect, some embodiments of the present application further provide an electrical device, which includes the battery provided by the aforementioned technical solution, and the battery is used to provide electrical energy.

[0025] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0026] The present application provides a battery cell, which includes a housing, an electrode assembly, an electrode terminal, and a first insulating member. The housing includes a wall portion having an electrode lead-out hole. The electrode assembly is disposed within the housing. The electrode terminal extends through the electrode lead-out hole, and a first portion is disposed on a first side of the wall portion and covers the electrode lead-out hole. The electrode terminal is electrically connected to the electrode assembly. At least a portion of the first insulating member is disposed between the first portion and the wall portion, and the wall portion and the first insulating member have a concave-convex fit. In the above structure, since the first insulating member disposed between the first portion and the wall portion has a concave-convex fit with the wall portion, the electrode terminal and the wall portion can be positioned by the fit between the first insulating member and the wall portion, reducing the possibility of the electrode terminal rotating on the wall portion, which is beneficial for reducing the possibility of the electrode terminal loosening and improving the reliability of the battery cell. The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features, and advantages of the present application more obvious and easy to understand, the following specifically describes the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference numerals are used to denote the same components.

[0028] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0029] Figure 2 An exploded view of a battery provided in some embodiments of the present application;

[0030] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0031] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0032] In the attached figure:

[0033] 1. Casing; 11. Wall; 111. First recess; 112. Electrode lead-out hole; 113. Second protrusion; 12. Shell; 13. Cover; 14. Cavity; 2. Electrode assembly; 3. Electrode terminal; 31. First portion; 32. Second portion; 321. Second recess; 33. Third portion; 4. First insulating member; 41. First protrusion; 5. Second insulating member; 6. Main body; 7. Extension portion; 10. Case; 101. First case; 102. Second case; 20. Battery cell; 1000. Vehicle; 100. Battery device; 200. Controller; 300. Motor. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0037] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0038] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0039] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] Currently, judging by market developments, batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0041] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0042] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0043] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0044] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode and a negative electrode. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released back and forth between the positive and negative electrodes.

[0045] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode to prevent a short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0046] 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 layer disposed on at least one surface of the positive electrode current collector.

[0047] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0048] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, silver-treated aluminum, silver-treated stainless steel, carbon electrode, carbon, nickel or titanium may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0049] As an example, the positive electrode active material layer includes a positive electrode active material. The positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to lithium iron phosphate (such as Li FePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, Li Mn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、L i N i 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、L i N i 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、L i N i 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、L i N i 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al0.05 O2) and at least one of its modified compounds, etc.

[0050] In some embodiments, the positive electrode may be a carbon foam or a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0051] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0052] As an example, the negative electrode current collector may be a metal foil, a metal foam, a carbon foam, or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, a carbon electrode, carbon, nickel, or titanium may be used. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0053] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0054] In some embodiments, the negative electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0055] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0056] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0057] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0058] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0059] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0060] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode, and serves to transport ions and isolate the positive and negative electrodes.

[0061] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0062] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0063] In some embodiments, the electrolyte salt may be selected from 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0064] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0065] The gel electrolyte consists of a polymer-based electrolyte framework network, combined with an ionic liquid-lithium salt.

[0066] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0067] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0068] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous Li PON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0069] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0070] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0071] In some embodiments, the electrode assembly is a laminate structure.

[0072] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0073] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0074] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0075] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0076] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0077] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0078] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0079] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0080] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0081] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0082] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0083] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0084] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0085] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0086] Since the electrode terminals provided on the outer shell of the battery cell and connected to the internal electrode terminals serve as the power output terminals of the battery cell, the tightness of the structure plays a very important role in whether the battery cell can normally supply power to the outside.

[0087] Currently, to reduce the possibility of electrode terminals rotating on the housing, the portion of the housing where the electrode terminals are mounted is typically recessed to form a groove, allowing the entire electrode terminal to fit within the groove, securing the electrode terminal to the sidewalls of the groove. However, this solution is only suitable for housings made of softer materials. For harder housings, the groove is difficult to form, making it difficult to position the electrode terminals relative to the housing. This creates the possibility of rotation of the electrode terminals relative to the housing, hindering the reliability of the battery cells.

[0088] In order to improve the reliability of a battery cell, the present application provides a battery cell comprising a housing, an electrode assembly, an electrode terminal, and a first insulating member. The housing comprises a wall portion having an electrode lead-out hole, the electrode assembly being disposed within the housing, the electrode terminal extending through the electrode lead-out hole, and a first portion disposed on a first side of the wall portion and covering the electrode lead-out hole, the electrode terminal being electrically connected to the electrode assembly. At least a portion of the first insulating member is disposed between the first portion and the wall portion, with the wall portion and the first insulating member engaging in a concave-convex manner. In the above structure, since the first insulating member disposed between the first portion and the wall portion engages in a concave-convex manner with the wall portion, the electrode terminal and the wall portion can be positioned by the engagement of the first insulating member and the wall portion, reducing the possibility of the electrode terminal rotating on the wall portion, thereby reducing the possibility of the electrode terminal loosening and improving the reliability of the battery cell.

[0089] The battery cells described in the embodiments of this application are suitable for use in batteries and electrical devices using the batteries. The battery cells can be used in, but are not limited to, batteries. They can also be used in vehicles, aircraft, ships, electronic equipment, power tools, and other products, thereby improving the reliability of these products.

[0090] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0091] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0092] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0093] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0094] Please refer to Figure 2 , Figure 2 This is a disassembled diagram of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a storage space for the battery cell 20. There can be multiple battery cells 20 in the battery device 100, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the case 10; of course, the battery device 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the case 10.

[0095] The housing 10 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 cover each other to define a storage space for accommodating the battery cells 20. The first housing 101 and the second housing 102 may have various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first housing 101 may be a hollow structure with one side open, and the second housing 102 may also be a hollow structure with one side open. The open side of the second housing 102 covers the open side of the first housing 101, thereby forming the housing 10 with a storage space.

[0096] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0097] In some embodiments of the present application, reference Figure 3 and Figure 4 The battery cell 20 includes a shell 1, an electrode assembly 2, an electrode terminal 3 and a first insulating member 4. The shell 1 includes a wall portion 11, and the wall portion 11 is provided with an electrode lead-out hole 112; the electrode assembly 2 is arranged in the shell 1; the electrode terminal 3 passes through the electrode lead-out hole 112, and the electrode terminal 3 includes a first part 31. The first part 31 is arranged on a first side of the wall portion 11 and covers the electrode lead-out hole 112, and the electrode terminal 3 is electrically connected to the electrode assembly 2; at least part of the first insulating member 4 is arranged between the first part 31 and the wall portion 11, and the wall portion 11 and the first insulating member 4 are matched in a concave-convex manner.

[0098] The outer shell 1 may be a wall structure provided on the periphery of a battery cell 20, forming a cavity 14 for accommodating the electrode assembly 2 and other components of the battery cell 20, as well as the electrolyte, and protecting the electrode assembly 2 and other components of the battery cell 20. The wall portion 11 may be a portion of the wall structure within the outer shell 1, on which the electrode terminals 3 are provided. The electrode lead-out hole 112 may be a through-hole provided in the wall portion 11, extending through the thickness of the wall portion 11, connecting the cavity 14 within the outer shell 1 with the outside world.

[0099] The electrode assembly 2 is disposed in the housing 1 , immersed in the electrolyte inside the housing 1 , and protected by the housing 1 .

[0100] The electrode terminal 3 is a component provided on the wall portion 11. It passes through the electrode lead-out hole 112 and extends from both ends of the electrode lead-out hole 112. It is not only electrically connected to the electrode assembly 2 inside the housing 1, but also used to electrically connect to an electrical device or charging device outside the battery cell 20 to facilitate charging and discharging of the battery cell 20. The electrode terminal 3 may include, but is not limited to, a columnar structure, and those skilled in the art may configure it according to actual circumstances.

[0101] The first side can be the outer side of the wall portion 11 away from the electrode assembly 2, or the inner side of the wall portion 11 close to the electrode assembly 2. By disposing at least a portion of the electrode terminal 3 on the first side of the wall portion 11 and covering the electrode lead-out hole 112, the electrode terminal 3 can be electrically connected to an external electrical device or charging device and can block the electrode lead-out hole 112. The first portion 31 can be the portion of the electrode terminal 3 located on the first side of the wall portion 11. By being disposed on the first side, it blocks the electrode lead-out hole 112 from the first side.

[0102] The first insulating member 4 may be a component having insulating properties. By connecting at least a portion of the first insulating member 4 between the portion of the electrode terminal 3 located on the first side of the wall portion 11 and the wall portion 11, not only can the electrode terminal 3 and the wall portion 11 be isolated from each other, but the electrode terminal 3 can also be connected to the wall portion 11 through the first insulating member 4.

[0103] Exemplarily, the first insulating member 4 can be a component formed by curing insulating glue. By setting the insulating glue between the part of the electrode terminal 3 located on the first side of the wall portion 11 and the wall portion 11, the first insulating member 4 formed by curing the insulating glue can not only connect the electrode terminal 3 and the wall portion 11, but also isolate the electrode terminal 3 and the wall portion 11.

[0104] The concave-convex fit between the wall portion 11 and the first insulating member 4 may mean that a convex portion is provided on the wall portion 11, a concave portion matching the convex portion is provided on the first insulating member 4, and at least a portion of the convex portion is fitted into the concave portion; or it may mean that a concave portion is provided on the wall portion 11, a convex portion matching the concave portion is provided on the first insulating member 4, and at least a portion of the convex portion is fitted into the concave portion.

[0105] In the above structure, since the first insulating member 4 arranged between the first part 31 and the wall portion 11 is matched with the wall portion 11 in a concave-convex manner, the electrode terminal 3 and the wall portion 11 can be positioned by matching the first protrusion 41 and the first recess 111, thereby reducing the possibility of the electrode terminal 3 rotating on the wall portion 11, which is beneficial to reducing the possibility of the electrode terminal 3 loosening and improving the reliability of the battery cell 20.

[0106] In some embodiments, the wall portion 11 defines a first recess 111 that is recessed inward from a side facing the first insulating member 4 . The first insulating member 4 defines a first protrusion 41 . At least a portion of the first protrusion 41 fits into the first recess 111 .

[0107] The first recess 111 can be formed by an inward depression of the side of the wall portion 11 toward the first insulating member 4, and is used to mate with the first protrusion 41 of the first insulating member 4. The opening of the first recess 111 faces the first insulating member 4, allowing the first insulating member 4 to mate with the first recess 111. By providing the first protrusion 41 protruding from the first insulating member 4, and inserting at least a portion of the first protrusion 41 into the first recess 111, the mating connection between the first protrusion 41 and the first recess 111 can reduce the possibility of the electrode terminal 3 rotating relative to the wall portion 11. Because the first recess 111 is merely a recessed structure for inserting the first protrusion 41, it requires a smaller machining area than a groove that accommodates the entire electrode terminal 3, making it more convenient to machine and easier to form.

[0108] In some embodiments, along the thickness direction of the wall portion 11 , at least a portion of the projection of the first recess 111 is located within the projection range of the first portion 31 .

[0109] By ensuring that at least a portion of the projection of the first recess 111 along the thickness direction of the wall portion 11 is located within the projection range of the first portion 31 along the thickness direction of the wall portion 11, the mating position of the first protrusion 41 and the first recess 111 is located between the first portion 31 and the wall portion 11. This can reduce the size of the first insulating member 4 extending beyond the electrode terminal 3, which is beneficial for reducing the size of the first insulating member 4 and thereby reducing costs.

[0110] In some embodiments, a plurality of first recesses 111 are provided, and the plurality of first recesses 111 are arranged at intervals.

[0111] By arranging a plurality of first recesses 111 spaced apart on the side of the wall portion 11 facing the first insulating member 4, the first insulating member 4 and the wall portion 11 have a plurality of structures for positioning, and the electrode terminal 3 and the wall portion 11 have a plurality of structures for positioning, which is beneficial to improving the firmness of the positioning between the electrode terminal 3 and the wall portion 11, thereby further improving the reliability of the battery cell 20.

[0112] In some embodiments, a plurality of first recesses 111 are spaced apart around the central axis of the electrode terminal 3 .

[0113] The plurality of first recesses 111 are spaced apart around the central axis of the electrode terminal 3. Alternatively, the plurality of first recesses 111 may be spaced apart along the same circumference around a first side of the central axis of the electrode terminal 3. By spacing the plurality of first recesses 111 around the central axis of the electrode terminal 3, the connection between the plurality of first recesses 111 and the first protrusion 41 can uniformly provide torque to the electrode terminal 3 to prevent rotation thereof, thereby improving the effectiveness of the cooperation between the first recesses 111 and the first protrusion 41 in preventing rotation of the electrode terminal 3.

[0114] In some embodiments, along the radial direction of the electrode terminal 3 , the size of the first recess 111 is d, the size of the first protrusion 41 is D, and dD≧0.05 mm.

[0115] The dimension d of the first recess 111 along the radial direction of the electrode terminal 3 may be the dimension of the bottom wall of the first recess 111 in the radial direction of the electrode terminal 3. The dimension D of the first protrusion 41 along the radial direction of the electrode terminal 3 may be the maximum dimension of the first protrusion 41 in the radial direction of the electrode terminal 3.

[0116] By setting the relationship between the radial dimension d of the first recess 111 along the electrode terminal 3 and the radial dimension D of the first protrusion 41 along the electrode terminal 3 to dD≥0.05mm, the first protrusion 41 of the first insulating member 4 can more easily enter the first recess 111, which facilitates the processing and assembly of the battery cell 20.

[0117] The relationship between the radial dimension d of the first recess 111 along the electrode terminal 3 and the radial dimension D of the first protrusion 41 along the electrode terminal 3 can be set to dD≥0.1mm. For example, dD can be 0.1mm, 0.15mm or 0.2mm. The first protrusion 41 of the first insulating member 4 can enter the first recess 111 more easily, which facilitates the processing and assembly of the battery cell 20.

[0118] In some embodiments, along the thickness direction of the wall portion 11 , the depth of the first recess 111 is w, the height of the first protrusion 41 is W, and wW≧0.03 mm.

[0119] The depth w of the first recess 111 along the thickness direction of the wall portion 11 may be the depth of the first recess 111 in the thickness direction of the wall portion 11. The dimension W of the first protrusion 41 along the thickness direction of the wall portion 11 may be the maximum dimension of the first protrusion 41 extending along the thickness direction of the wall portion 11.

[0120] By setting the relationship between the depth w of the first recess 111 along the thickness direction of the wall portion 11 and the dimension W of the first protrusion 41 along the thickness direction of the wall portion 11 to wW≥0.03mm, the first protrusion 41 of the first insulating member 4 is not likely to interfere with the bottom wall of the first recess 111 during the process of being installed into the first recess 111, so that the first protrusion 41 of the first insulating member 4 can be more conveniently installed in the first recess 111, which is beneficial to improving the convenience of processing and assembly of the battery cell 20.

[0121] The relationship between the depth w of the first recess 111 along the thickness direction of the wall portion 11 and the dimension W of the first protrusion 41 along the thickness direction of the wall portion 11 can be set to wW≥0.05mm. For example, wW can be 0.1mm, 0.15 or 0.2mm, so that the first protrusion 41 of the first insulating member 4 is not easy to interfere with the bottom wall of the first recess 111 during the process of being installed into the first recess 111, so that the first protrusion 41 of the first insulating member 4 can be more conveniently installed in the first recess 111, which is conducive to improving the convenience of processing and assembly of the battery cell 20.

[0122] In some embodiments, along the radial direction of the electrode terminal 3, the distance between the first recess 111 and the central axis of the electrode terminal 3 is L1, and the maximum distance between the edge of the first insulating member 4 and the central axis of the electrode terminal 3 is L2.

[0123] The distance L1 between the first recess 111 and the central axis of the electrode terminal 3 along the radial direction of the electrode terminal 3 may refer to the distance between the central axis of the first recess 111 and the central axis of the electrode terminal 3; the maximum distance L2 between the edge of the first insulating member 4 and the central axis of the electrode terminal 3 may refer to the distance between the edge of the first insulating member 4 farthest from the central axis of the electrode terminal 3 and the central axis of the electrode terminal 3.

[0124] The relationship between the distance L1 of the first recess 111 from the central axis of the electrode terminal 3 in the radial direction of the electrode terminal 3 and the maximum distance L2 from the edge of the first insulating member 4 to the central axis of the electrode terminal 3 is set as Not only is the mating position of the first protrusion 41 and the first recess 111 located between the portion of the electrode terminal 3 located on the first side of the wall portion 11 and the wall portion 11, but the first recess 111 is also not too close to the central axis of the electrode terminal 3, so that the mating of the first protrusion 41 and the first recess 111 can provide sufficient torque to resist the rotation of the electrode terminal 3, making it difficult for the electrode terminal 3 of the battery cell 20 to rotate.

[0125] The relationship between the distance L1 of the first recess 111 from the central axis of the electrode terminal 3 in the radial direction of the electrode terminal 3 and the maximum distance L2 from the edge of the first insulating member 4 to the central axis of the electrode terminal 3 can be set to For example, It can be 0.2, 0.5 or 0.8, which not only makes the matching position of the first protrusion 41 and the first recess 111 located between the portion of the electrode terminal 3 located on the first side of the wall portion 11 and the wall portion 11, but also makes the first recess 111 not too close to the central axis of the electrode terminal 3, so that the matching of the first protrusion 41 and the first recess 111 can provide sufficient torque to resist the rotation of the electrode terminal 3, so that the electrode terminal 3 of the battery cell 20 is not easy to rotate.

[0126] In some embodiments, along the radial direction of the electrode terminal 3 , the distance between the first recess 111 and the central axis of the electrode terminal 3 is L1 , and L1 ≥ 3 mm.

[0127] By setting the range of the distance L1 between the first recess 111 and the central axis of the electrode terminal 3 to L1 ≥ 3 mm, the first recess 111 has a sufficient distance from the central axis of the electrode terminal 3 to provide sufficient torque to resist the rotation of the electrode terminal 3, so that the electrode terminal 3 of the battery cell 20 is not easily rotated.

[0128] The range of the distance L1 between the first recess 111 and the central axis of the electrode terminal 3 can be set to L1≥4mm. For example, L1 can be set to 4mm, 5mm or 6mm, so that the first recess 111 has a sufficient distance from the central axis of the electrode terminal 3 to provide sufficient torque to resist the rotation of the electrode terminal 3, so that the electrode terminal 3 of the battery cell 20 is not easily rotated.

[0129] In some embodiments, along the radial direction of the electrode terminal 3 , the first insulating member 4 extends from between the first portion 31 and the wall portion 11 .

[0130] The first insulating member 4 extends from between the first portion 31 and the wall portion 11 along the radial direction of the electrode terminal 3. It can be that part of the first insulating member 4 is clamped between the first portion 31 and the wall portion 11, and part of the first insulating member 4 extends from between the first portion 31 and the wall portion 11, so that the first insulating member 4 can more comprehensively connect the portion of the electrode terminal 3 located on the first side of the wall portion 11 and the connecting surface between the wall portion 11, which is beneficial to improving the connection strength of the first insulating member 4 between the portion of the electrode terminal 3 located on the first side of the wall portion 11 and the wall portion 11.

[0131] Exemplarily, the portion extending from between the electrode terminal 3 and the wall portion 11 may be wrapped around the side surface of the first portion 31 to protect the electrode terminal 3 .

[0132] In some embodiments, the electrode terminal includes a second portion 32 connected to the first portion 31 , and the second portion 32 is disposed on the second side of the wall portion and opposite to the first portion 31 .

[0133] The second portion 32 may be a portion of the electrode terminal located on a second side of the wall portion. The first side and the second side may be two opposing sides of the wall portion along the thickness direction of the wall portion. By arranging the second portion 32 on the second side of the wall portion, the second portion 32 is arranged opposite the first portion 31.

[0134] In some embodiments, a second protrusion 113 is provided on the side of the wall portion facing away from the first insulating member, and the second protrusion 113 is arranged opposite to the first recess. The second part 32 is provided with a second recess 321 which is recessed inward from the side facing the wall portion, and at least a portion of the second protrusion 113 is engaged in the second recess 321.

[0135] The second protrusion 113 may be a structure in which the wall portion protrudes away from the side of the first insulating member and away from the first insulating member. By arranging the second protrusion 113 opposite the first recess, the second protrusion 113 and the first recess can be formed simultaneously by stamping, which helps to reduce the difficulty of processing the second protrusion 113 and the first recess.

[0136] The second recess 321 may be formed by the second portion 32 being recessed inwardly toward the side of the wall. By fitting at least a portion of the second protrusion 113 into the second recess 321, the fit between the second protrusion 113 and the second recess 321 can further reduce the possibility of the electrode terminal rotating relative to the wall.

[0137] In some embodiments, the battery cell further includes a second insulating member disposed between the wall portion and the second portion 32 , and at least a portion of the second insulating member is sandwiched between the second portion 32 and the wall portion.

[0138] The second insulating member 5 may be a component on the second side for insulating the wall portion 11 from other components in the battery cell 20. The second insulating member 5 is at least partially sandwiched between the second portion 32 and the wall portion 11. Alternatively, the second insulating member 5 may be sandwiched between the second portion 32 and the wall portion 11, so that the second insulating member 5 can insulate the wall portion 11 from components located on the second side of the housing 1.

[0139] In some embodiments, the first side of the wall portion 11 may be the outside of the housing 1, and the second side of the wall portion 11 may be the inside of the housing 1. In addition to insulating and isolating the wall portion 11 from the electrode assembly 2 in the housing 1, the second insulating member 5 may also insulate and isolate the wall portion 11 from the electrode terminal 3.

[0140] Exemplarily, the second insulating member 5 and the first insulating member 4 are both made of plastic.

[0141] In some embodiments, the second insulating member 5 includes a main body 6 and an extension portion 7 connected to each other, the main body 6 is connected to the wall 11, the extension portion 7 extends along the thickness of the wall 11, and at least part of the extension portion 7 is located between the electrode assembly 2 and the shell 1.

[0142] The main body 6 may be the main structure of the second insulating member 5, which is connected to the inner side of the wall portion 11 and is used to enable the second insulating member 5 to be firmly connected to the wall portion 11. The extension portion 7 may be the portion of the second insulating member 5 that extends from the main body 6. By extending the extension portion 7 along the thickness of the wall portion 11 and extending at least a portion of the extension portion 7 between the electrode assembly 2 and the outer shell 1, the extension portion 7 can extend to the first side of the connection between the electrode assembly 2 and the electrode terminal 3, thereby reducing the possibility of electrical connection between the connection between the electrode assembly 2 and the electrode terminal 3 and the outer shell 1.

[0143] In some embodiments, the electrode terminal includes a third portion 33 , the third portion 33 is integrated with the second portion 32 , and the third portion 33 is riveted to the first portion 31 through the electrode lead-out hole.

[0144] The third portion 33 may be the portion of the electrode terminal that connects the first portion 31 and the second portion 32. The third portion 33 is integrally formed with the second portion 32, which may mean that the third portion 33 and the second portion 32 are integrally formed. For example, the third portion 33 and the second portion 32 may be simultaneously manufactured using an integral molding process such as stamping or casting, or may be formed by machining a single blank.

[0145] By passing the third part 33 through the electrode lead-out hole, the third part 33 can conveniently connect the first part 31 and the second part 32 .

[0146] The third portion 33 passes through the electrode lead-out hole and is riveted to the first portion 31 . The portion of the second portion 32 extending from the electrode lead-out hole 112 may be inserted into the riveting hole and upset to form a nail head that abuts against the inner wall of the riveting hole.

[0147] In some embodiments, the housing 1 includes a shell 12 and a cover 13 . The shell 12 forms a cavity 14 with an opening. The electrode assembly 2 is disposed in the cavity 14 . The cover 13 covers the opening and is connected to the shell 12 . The cover 13 includes a wall portion 11 .

[0148] The shell 12 and the cover 13 are different structures in the outer shell 1. The shell 12 can enclose a cavity 14 with an opening at at least one end. The cover 13 seals the opening and is connected to the shell 12, so that the cavity 14 is a sealed space that can hold the electrode assembly 2 and the electrolyte.

[0149] By making the cover 13 include the wall portion 11 of the aforementioned technical solution, the electrode lead-out hole 112 and the electrode terminal 3 can be provided on the cover 13. Since the cover 13 is generally a plate-shaped structure, the electrode lead-out hole 112 and the electrode terminal 3 are conveniently provided on the cover 13.

[0150] Some embodiments of the present application also provide a cover assembly, which includes a cover body 13, an electrode terminal 3 and a first insulating member 4. The cover body 13 is provided with an electrode lead-out hole 112, and the electrode terminal 3 passes through the electrode lead-out hole 112. The electrode terminal 3 includes a first part 31, and the first part 31 is arranged on one side of the cover body 13 and covers the electrode lead-out hole 112. At least part of the first insulating member 4 is arranged between the first part 31 and the cover body 13, and the cover body 13 and the first insulating member 4 are matched in a concave and convex manner.

[0151] Some embodiments of the present application further provide a battery device 100 , which includes a battery cell 20 provided by the above technical solution.

[0152] Some embodiments of the present application further provide an electrical device, which includes the battery device 100 provided by the above technical solution, and the battery device 100 is used to provide electrical energy.

[0153] Some embodiments of the present application provide a battery cell 20 as shown in the figure, which includes a shell 1, an electrode assembly 2, an electrode terminal 3, a first insulating member 4 and a second insulating member 5. The shell 1 includes a wall portion 11 provided with an electrode lead-out hole 112, and the electrode assembly 2 is arranged in the shell 1. The first part 31 of the electrode terminal 3 covers the electrode lead-out hole 112 from the first side of the wall portion 11 and clamps at least a portion of the first insulating member 4 with the wall portion 11. The second part 32 passes through the electrode lead-out hole 112 and is riveted to the first part 31. At least a portion of the second part 32 is arranged on the second side of the shell 1 and clamps at least a portion of the second insulating member 5 with the wall portion 11. The wall portion 11 is provided with a first recess 111 that is recessed inward from the side facing the first insulating member 4. The first insulating member 4 is convexly provided with a first protrusion 41, and at least a portion of the first protrusion 41 is fitted into the first recess 111. In the above structure, since the first protrusion 41 protruding from the first insulating member 4 connected to the electrode terminal 3 cooperates with the first recess 111 recessed inwardly of the wall portion 11, the electrode terminal 3 and the wall portion 11 can be positioned by the cooperation of the first protrusion 41 and the first recess 111, thereby reducing the possibility of the electrode terminal 3 rotating on the wall portion 11, which is beneficial to reducing the possibility of the electrode terminal 3 loosening and improving the reliability of the battery cell 20.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; an electrode assembly, disposed in the housing; an electrode terminal passing through the electrode lead-out hole, the electrode terminal comprising a first portion, the first portion being disposed on a first side of the wall portion and covering the electrode lead-out hole, the electrode terminal being electrically connected to the electrode assembly; A first insulating member, at least a portion of the first insulating member is disposed between the first portion and the wall portion, and the wall portion and the first insulating member are matched with each other in a concave-convex manner.

2. The battery cell according to claim 1, wherein: The wall portion is provided with a first recessed portion recessed inwardly from a side surface facing the first insulating member, and the first insulating member is provided with a first protrusion, at least a portion of the first protrusion is fitted into the first recessed portion.

3. The battery cell according to claim 2, characterized in that: Along the thickness direction of the wall portion, at least a portion of the projection of the first recess is located within the projection range of the first portion.

4. The battery cell according to claim 2, characterized in that There are a plurality of first recesses, and the plurality of first recesses are arranged at intervals.

5. The battery cell according to claim 4, characterized in that The plurality of first recesses are spaced apart around a central axis of the electrode terminal.

6. The battery cell according to claim 2, characterized in that Along the radial direction of the electrode terminal, a size of the first recess is d, a size of the first protrusion is D, and dD is ≥ 0.05 mm.

7. The battery cell according to claim 2, characterized in that: Along the thickness direction of the wall portion, the depth of the first recess is w, the height of the first protrusion is W, and wW≥0.03 mm.

8. The battery cell according to claim 2, characterized in that Along the radial direction of the electrode terminal, the distance between the first recess and the central axis of the electrode terminal is L1, and the maximum distance between the edge of the first insulating member and the central axis of the electrode terminal is L2.

9. The battery cell according to claim 2, characterized in that: Along the radial direction of the electrode terminal, the distance between the first recess and the central axis of the electrode terminal is L1, and L1 is ≥ 3 mm.

10. The battery cell according to claim 2, characterized in that The first insulating member protrudes from between the first portion and the wall portion in a radial direction of the electrode terminal.

11. The battery cell according to claim 2, characterized in that The electrode terminal includes a second portion connected to the first portion, wherein the second portion is disposed on a second side of the wall portion and opposite to the first portion.

12. The battery cell according to claim 11, characterized in that The side of the wall portion facing away from the first insulating member is provided with a second protrusion, the second protrusion is arranged opposite to the first recess, the second part is provided with a second recess recessed inward from the side facing the wall portion, and at least part of the second protrusion is fitted in the second recess.

13. The battery cell according to claim 11, characterized in that The battery cell further includes a second insulating member disposed between the wall portion and the second part, wherein at least a portion of the second insulating member is sandwiched between the second part and the wall portion.

14. The battery cell according to claim 13, characterized in that The second insulating member includes a main body portion and an extension portion connected to each other, the main body portion is connected to the wall portion, the extension portion extends along the thickness of the wall portion, and at least a portion of the extension portion is located between the electrode assembly and the shell.

15. The battery cell according to claim 11, characterized in that The electrode terminal includes a third portion, the third portion is integrated with the second portion, and the third portion passes through the electrode lead-out hole and is riveted to the first portion.

16. The battery cell according to claim 1, characterized in that The housing includes a shell and a cover. The shell forms a cavity with an opening. The electrode assembly is disposed in the cavity. The cover covers the opening and is connected to the shell. The cover includes the wall portion.

17. A cover plate assembly, characterized in that: include: The cover body is provided with an electrode lead-out hole; an electrode terminal passing through the electrode lead-out hole, wherein the electrode terminal includes a first portion, the first portion being disposed on one side of the cover and covering the electrode lead-out hole; A first insulating member, at least a portion of the first insulating member is disposed between the first portion and the cover, and the cover is in concave-convex fit with the first insulating member.

18. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 16.

19. An electrical device, characterized in that: The battery device according to claim 18 is used to provide electrical energy.

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