Battery monomer, battery and electric device

Abstract

Some embodiments of the present application provide a battery cell, a battery and a power utilization device, a housing in the battery cell pack has an accommodation cavity, an electrode assembly is arranged in the accommodation cavity and comprises a first tab, an electrode terminal is arranged in the housing and electrically connected to the first tab, the electrode terminal is provided with a recess, and the recess is provided with a first electrode. The cover plate is arranged on the side, away from the electrode assembly, of the electrode terminal and covers the concave part. The side, away from the electrode assembly, of the electrode terminal is provided with a positioning structure arranged along the periphery of the concave part. The positioning structure arranged along the periphery of the concave part is arranged on one side, far away from the electrode assembly, of the electrode terminal, so that the position of the cover plate can be determined through the positioning structure in the assembling process of the battery monomer so as to obtain the concentricity of the cover plate and the concave part, and the concentricity of the cover plate and the concave part can be improved; and the connection effect of the cover plate and the electrode terminal is improved, so that the plugging effect of the cover plate on the concave part is improved, and the yield in the production process of the battery monomer is favorably improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery 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, electric tools, etc.

[0003] As the application scope of batteries becomes wider and wider, the market demand for batteries is increasing. How to improve the yield rate in the battery production process has attracted more and more attention from technicians in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, wherein the battery cell is conducive to improving the yield rate of production.

[0005] In the first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a cover plate, wherein the shell has a accommodating cavity; the electrode assembly is arranged in the accommodating cavity and includes a first pole ear; the electrode terminal is arranged in the shell and electrically connected to the first pole ear, and the electrode terminal is provided with a recess; the cover plate is arranged on a side of the electrode terminal away from the electrode assembly and covers the recess, wherein a positioning structure arranged along the outer periphery of the recess is provided on the side of the electrode terminal away from the electrode assembly.

[0006] Since a positioning structure arranged along the outer periphery of the recess is provided on the side of the electrode terminal away from the electrode assembly, the position of the cover plate can be determined by the positioning structure during the assembly process of the battery cell to obtain the concentricity of the cover plate and the recess, which is beneficial to improving the concentricity of the cover plate and the recess, improving the connection effect between the cover plate and the electrode terminal, and further improving the sealing effect of the cover plate on the recess, which helps to improve the yield rate in the production process of the battery cell.

[0007] According to the battery cell provided by some embodiments of the present application, the positioning structure is configured to be concentric with the recess.

[0008] By arranging the positioning structure and the recessed portion concentrically, the axis center of the recessed portion can be obtained by measuring the axis center of the positioning structure, and the concentricity of the recessed portion and the cover plate can be obtained by detecting the concentricity of the positioning structure and the cover plate, thereby facilitating detection.

[0009] According to the battery cell provided in some embodiments of the present application, the positioning structure includes a protrusion, and the protrusion is arranged along the periphery of the recess.

[0010] According to the battery cell provided in some embodiments of the present application, along the axial direction of the recess, an end of the protrusion away from the electrode assembly does not exceed the cover plate.

[0011] By ensuring that one end of the protrusion away from the electrode assembly in the axial direction of the recess does not extend beyond the cover plate, the protrusion is less likely to interfere with the connection between the cover plate and an external electrical device.

[0012] According to the battery cell provided in some embodiments of the present application, the positioning structure includes a first groove, and the first groove is arranged along the outer periphery of the recessed portion.

[0013] According to the battery cell provided in some embodiments of the present application, the first groove has an opening facing away from the electrode assembly, and along the radial direction of the recess, the size of the opening is A, 0.1 mm≤A≤0.8 mm.

[0014] By arranging the opening of the first groove to face away from the electrode assembly, the assembler can identify the first groove from the outside of the electrode terminal through the equipment, so as to facilitate the measurement of the axis of the positioning structure.

[0015] According to the battery cells provided in some embodiments of the present application, the depth of the first groove in the axial direction of the recess is B, 0.1mm≤B≤0.8mm, so that the first groove has a suitable depth. Not only can the first groove form a more obvious imprint on the outside of the electrode terminal and can be easily identified by assemblers through equipment, but it can also reduce the impact of the first groove on the electrode terminal structure, which is beneficial to maintaining the structural strength of the electrode terminal.

[0016] According to the battery cell provided in some embodiments of the present application, the positioning structure includes a plurality of positioning parts arranged at intervals along the circumference of the recess, and the positioning structure formed by the plurality of positioning parts is coaxial with the recess by arranging the plurality of positioning parts in the positioning structure at intervals along the circumference of the recess. Exemplarily, the plurality of positioning parts may be a plurality of arc-shaped first grooves, or may be a plurality of arc-shaped protrusions.

[0017] According to the battery cell provided in some embodiments of the present application, the positioning structure is an annular structure arranged around the outer periphery of the recess, so that the positioning structure is coaxially sleeved on the outer side of the recess.

[0018] According to the battery cells provided in some embodiments of the present application, along the radial direction of the recess, the minimum distance between the positioning structure and the cover plate is C, 2mm≤C≤12mm. This not only leaves enough space in the area close to the recess to place the formation probe, but also prevents the positioning structure from being too close to the edge of the electrode terminal, making it easier for the image recognition device to distinguish the positioning structure from the edge of the electrode terminal.

[0019] According to the battery cell provided in some embodiments of the present application, the outer shell includes a shell and an end cover, the shell has an opening, and the end cover covers the opening; the shell includes an end wall arranged opposite to the end cover; the electrode terminal is arranged on the end wall, so that when the battery cell is connected to an electrical device, the electrode terminal can realize the electrical connection between the battery cell and the electrical device by firmly abutting against the power input terminal of the electrical device.

[0020] According to the battery cell provided in some embodiments of the present application, the electrode assembly includes a second electrode tab having a polarity opposite to that of the first electrode tab, and the second electrode tab is electrically connected to the end cover.

[0021] According to the battery cell provided in some embodiments of the present application, the cover plate is welded to the electrode terminal. Welding can melt the material of the cover plate and the material of the electrode terminal together, which is not only conducive to improving the connection firmness between the cover plate and the electrode terminal, but also conducive to improving the sealing of the cover plate covering the recess.

[0022] In a second aspect, some embodiments of the present application provide a battery, which includes a battery cell provided by any of the above technical solutions.

[0023] In a third aspect, some embodiments of the present application provide an electrical device, which includes a battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0024] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0025] Some embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, an electrode terminal and a cover plate, wherein the housing has a receiving cavity, the electrode assembly is disposed in the receiving cavity and includes a first pole ear, the electrode terminal is disposed in the housing and electrically connected to the first pole ear, the electrode terminal is provided with a recess, and the cover plate is disposed on a side of the electrode terminal away from the electrode assembly and covers the recess, wherein a positioning structure disposed along the periphery of the recess is disposed on the side of the electrode terminal away from the electrode assembly. Since a positioning structure disposed along the periphery of the recess is disposed on the side of the electrode terminal away from the electrode assembly, the position of the cover plate can be determined by the positioning structure during the assembly process of the battery cell to obtain the concentricity of the cover plate and the recess, which is conducive to improving the concentricity of the cover plate and the recess, improving the connection effect of the cover plate and the electrode terminal, and further improving the sealing effect of the cover plate on the recess, which helps to improve the yield rate of the battery cell during the production process.

[0026] 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 specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

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

[0029] Figure 2 A schematic diagram of disassembling a battery provided in some embodiments of the present application;

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

[0031] Figure 4 for Figure 3 The section GG in the figure is a cross-sectional view of some embodiments of the present application;

[0032] Figure 5 for Figure 4 F is an enlarged view of some embodiments of the present application;

[0033] Figure 6 for Figure 4 F is an enlarged view of some other embodiments of the present application;

[0034] Figure 7 for Figure 3 Section H is an enlarged view of some embodiments of the present application.

[0035] In the attached picture:

[0036] 1. Shell; 11. Shell; 111. End wall; 12. End cover; 2. Electrode assembly; 21. First pole ear; 22. Second pole ear; 3. Electrode terminal; 31. Recess; 32. Positioning structure; 321. Protrusion; 322. First groove; 323. Positioning portion; 4. Cover plate; 10. Case; 101. First case; 102. Second case; 20. Battery cell; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0038] 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.

[0039] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0040] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and 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. Moreover, a first feature being "above", "above" or "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 higher in level than the second feature. A first feature being "below", "below" or "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 lower in level than the second feature.

[0043] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0044] The battery mentioned in the embodiments of the present application includes one or more battery modules. The battery module refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0045] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0047] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode.

[0048] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting while allowing active ions to pass through.

[0049] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0050] 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 disposed on any one or both of the two facing surfaces of the positive electrode current collector.

[0051] 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-surface-treated aluminum, silver-surface-treated stainless steel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] 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 positive electrode active materials for batteries can also be used. These positive electrode active materials can 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 iron manganese phosphate, and at least one of a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as 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 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、L iNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、Li Ni 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as Li Ni 0.80 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0053] In some embodiments, the positive electrode may be 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 positive electrode, the positive electrode active material may not be provided on the surface of the metal foam, but the positive electrode active material may also be provided. As an example, lithium source material, potassium metal or sodium metal may be filled or / and deposited in the metal foam, and the lithium source material is lithium metal and / or lithium-rich material.

[0054] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet 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.

[0055] As an example, the negative electrode current collector may be a metal foil, a foamed metal, a foamed carbon or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, a carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum or a foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0057] In some embodiments, the negative electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy, etc. When the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0058] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0059] 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.

[0060] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0061] 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 stability and mechanical stability can be selected.

[0062] As an example, the main 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 special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0063] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0064] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0065] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0066] In some embodiments, the electrolyte salt can 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.

[0067] 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, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. 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.

[0068] The gel electrolyte includes a polymer-based electrolyte skeleton network combined with an ionic liquid-lithium salt.

[0069] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0070] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0071] 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.

[0072] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0073] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0074] In some embodiments, the electrode assembly is a laminate structure.

[0075] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0076] 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.

[0077] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0078] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0079] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0080] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0081] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0082] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0083] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0084] 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.

[0085] 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.

[0086] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0087] 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.

[0088] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0089] In the prior art, in order to inject liquid into the battery cell, a through hole is usually provided on the electrode terminal. After the injection is completed, a cover plate is usually provided to cover the through hole of the electrode terminal, and the cover plate is usually connected to the electrode terminal by welding. However, the cover plate is easily placed offset during the process of covering the through hole, which will cause quality problems in the welding of the cover plate, reduce the connection effect between the cover plate and the electrode terminal, affect the production quality of the battery cell, and reduce the yield rate of the battery cell production.

[0090] In order to improve the yield rate of a battery cell, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a cover plate, wherein the shell has a receiving cavity, the electrode assembly is arranged in the receiving cavity and includes a first pole ear, the electrode terminal is arranged in the shell and electrically connected to the first pole ear, the electrode terminal is provided with a recess, and the cover plate is arranged on a side of the electrode terminal away from the electrode assembly and covers the recess, wherein a positioning structure arranged along the periphery of the recess is arranged on the side of the electrode terminal away from the electrode assembly. Since a positioning structure arranged along the periphery of the recess is arranged on the side of the electrode terminal away from the electrode assembly, the position of the cover plate can be determined by the positioning structure during the assembly process of the battery cell to obtain the concentricity of the cover plate and the recess, which is conducive to improving the concentricity of the cover plate and the recess, improving the connection effect of the cover plate and the electrode terminal, and further improving the blocking effect of the cover plate on the recess, which helps to improve the yield rate of the battery cell production process.

[0091] The battery cell described in the embodiments of the present application is suitable for use in batteries and electrical devices using batteries. The battery cell can be used for, but is not limited to, batteries, and can also be used for vehicles, aircraft, ships, electronic equipment, power tools and other products, and can improve the reliability of these products.

[0092] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0093] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0094] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0095] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0096] Please refer to Figure 2 , Figure 2 An exploded diagram of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20. There may be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. 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 housing 10; of course, the battery 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 housing 10.

[0097] The box 10 may include a first box 101 and a second box 102, and the first box 101 and the second box 102 cover each other to define a placement space for accommodating the battery cells 20. The first box 101 and the second box 102 may be in various shapes, such as a cuboid, a cylinder, etc. The first box 101 may be a hollow structure with one side open, and the second box 102 may also be a hollow structure with one side open, and the open side of the second box 102 covers the open side of the first box 101, thereby forming a box 10 with a placement space.

[0098] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0099] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0100] Some embodiments of the present application provide a battery cell 20, such as Figure 3 and Figure 4 As shown, the battery cell 20 includes a shell 1, an electrode assembly 2, an electrode terminal 3 and a cover plate 4, the shell 1 has a accommodating cavity, the electrode assembly 2 is arranged in the accommodating cavity and includes a first pole ear 21; the electrode terminal 3 is arranged in the shell 1 and electrically connected to the first pole ear 21, and the electrode terminal 3 is provided with a recess 31; the cover plate 4 is arranged on a side of the electrode terminal 3 away from the electrode assembly 2 and covers the recess 31, wherein a positioning structure 32 arranged along the outer periphery of the recess 31 is provided on the side of the electrode terminal 3 away from the electrode assembly 2.

[0101] The housing 1 may be a wall structure disposed on the periphery of the battery cell 20, which can form a receiving cavity for receiving other components of the battery cell 20 such as the electrode assembly 2 and the electrolyte. The electrode assembly 2, as a component received in the housing 1, is in contact with the electrolyte, and active ions (such as lithium ions) can be conducted between the electrode assembly 2 and the electrolyte. The housing 1 includes an end cap 12 and a shell 11, wherein the shell 11 forms a receiving cavity with an opening, and the end cap 12 is sealed to the opening, so that the receiving cavity is a sealed cavity for receiving other components of the battery cell 20 and the electrolyte.

[0102] The electrode assembly 2 includes a stacked positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 2 is disposed in the receiving cavity and immersed in the electrolyte. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode sheet and the negative electrode sheet. The first tab 21 can be a component of the positive electrode sheet or the negative electrode sheet for drawing current outward.

[0103] The electrode terminal 3 may be a connection terminal provided on the housing 1, which is electrically connected to the first electrode tab 21 of the electrode assembly 2 and protrudes outward from the housing 1. The electrode terminal 3 is used to be electrically connected to an external electrical device to transmit electrical energy to the external electrical device. The electrode terminal 3 includes but is not limited to a cylindrical structure, and may also be a prismatic structure or other shapes.

[0104] The recess 31 may be a recessed structure provided on the electrode terminal 3, which is formed by recessing inward from the outer end surface of the electrode terminal 3 away from the electrode assembly 2. Exemplarily, the recess 31 may be connected to the accommodating cavity, or may not be connected to the accommodating cavity. If the recess 31 is connected to the accommodating cavity, the recess 31 forms a through hole that connects the accommodating cavity with the outside, so that the electrolyte is easily injected into the accommodating cavity through the recess 31.

[0105] The cover plate 4 may be a plate-shaped structure for covering the recess 31 of the electrode terminal 3. The cover plate 4 is disposed on a side of the electrode terminal 3 away from the electrode assembly 2 and covers the recess 31, so that the cover plate 4 can cover the opening of the recess 31.

[0106] The positioning structure 32 may be a structure provided on the electrode terminal 3 for positioning the cover plate 4. By providing the positioning structure 32 on the side of the electrode terminal 3 away from the electrode assembly 2 and along the periphery of the recess 31, the position of the cover plate 4 can be determined by the positioning structure 32 to obtain the concentricity of the cover plate 4 and the recess 31.

[0107] Exemplarily, the positioning structure 32 may be a structure protruding from the outer end surface of the electrode terminal 3 away from the electrode assembly 2 , or may be a structure recessed inward from the outer end surface of the electrode terminal 3 away from the electrode assembly 2 .

[0108] In the above structure, since a positioning structure 32 arranged along the outer periphery of the recess 31 is provided on the side of the electrode terminal 3 away from the electrode assembly 2, the position of the cover plate 4 can be determined by the positioning structure 32 during the assembly process of the battery cell 20 to obtain the concentricity of the cover plate 4 and the recess 31, which is beneficial to improving the concentricity of the cover plate 4 and the recess 31, improving the connection effect between the cover plate 4 and the electrode terminal 3, and further improving the sealing effect of the cover plate 4 on the recess 31, which helps to improve the yield rate of the battery cell 20 during the production process.

[0109] In some embodiments, the electrode terminal 3 may be made of aluminum or aluminum alloy, and the cover plate 4 may be made of the same material as the electrode terminal 3 , so that the cover plate 4 can be firmly connected to the electrode terminal 3 by welding.

[0110] In some embodiments, the positioning structure 32 is configured concentrically with the recess 31 .

[0111] By arranging the positioning structure 32 and the recess 31 concentrically, the axis of the recess 31 can be obtained by measuring the axis of the positioning structure 32, and the concentricity of the recess 31 and the cover plate 4 can be obtained by detecting the concentricity of the positioning structure 32 and the cover plate 4, making detection convenient.

[0112] In some embodiments, Figure 5 As shown, the positioning structure 32 includes a protrusion 321 , and the protrusion 321 is arranged along the outer circumference of the recess 31 .

[0113] The protrusion 321 may be a structure protruding outward from the outer end surface of the electrode terminal 3 away from the electrode assembly 2. The protrusion 321 is arranged along the outer circumference of the recess 31, and the protrusion 321 may be an annular structure extending along the circumference of the recess 31 and surrounding the outer circumference of the recess 31; or the protrusion 321 may be a plurality of arc structures arranged at intervals, and the plurality of arc structures are arranged at intervals along the circumference of the recess 31 on the outer circumference of the recess 31, and each arc structure extends along the circumference of the recess 31.

[0114] Exemplarily, the protrusion 321 can be simultaneously manufactured together with the electrode terminal 3 by using an integral molding process such as stamping.

[0115] In some embodiments, along the axial direction of the recess 31 , an end of the protrusion 321 away from the electrode assembly 2 does not extend beyond the cover plate 4 .

[0116] By ensuring that the end of the protrusion 321 away from the electrode assembly 2 in the axial direction of the recess 31 does not extend beyond the cover plate 4 , the protrusion 321 is less likely to interfere with the connection between the cover plate 4 and an external electrical device.

[0117] In some embodiments, the positioning structure 32 includes a first groove 322 , and the first groove 322 is disposed along the outer circumference of the recess 31 .

[0118] The first groove 322 may be a groove structure on the electrode terminal 3, which is formed by being recessed inward from the side of the electrode terminal 3 away from the electrode assembly 2. The first groove 322 is arranged along the outer circumference of the recess 31, and the first groove 322 may be an annular structure, which extends along the circumference of the recess 31 and surrounds the outer circumference of the recess 31; or the first groove 322 may be a plurality of arc structures arranged at intervals, and the plurality of arc structures are arranged at intervals along the circumference of the recess 31 on the outer circumference of the recess 31, and each arc structure extends along the circumference of the recess 31.

[0119] Exemplarily, the first groove 322 can be formed by machining the side of the electrode terminal 3 away from the electrode assembly 2 by milling, cutting or other material removal methods. In some embodiments, the first groove 322 can be formed by machining the side of the electrode terminal 3 away from the electrode assembly 2 by laser grooving.

[0120] In some embodiments, Figure 6 As shown, the first groove 322 has an opening facing away from the electrode assembly 2 , and along the radial direction of the recess 31 , the size of the opening is A, 0.1 mm≤A≤0.8 mm.

[0121] By arranging the opening of the first groove 322 to face away from the electrode assembly 2 , the assembler can identify the first groove 322 from the outside of the electrode terminal 3 through the equipment, so as to facilitate the measurement of the axis of the positioning structure 32 .

[0122] By setting the dimension A of the opening of the electrode assembly 2 in the radial direction of the recess 31 to a range of 0.1mm≤A≤0.8mm, the first groove 322 has a suitable width, which not only enables the first groove 322 to be more easily identified by the assembler through the equipment, but also reduces the impact of the first groove 322 on the structure of the electrode terminal 3, which is beneficial to maintaining the structural strength of the electrode terminal 3.

[0123] The size A of the opening of the electrode assembly 2 in the radial direction of the recess 31 is set to be 0.3 mm ≤ A ≤ 0.5 mm. For example, A can be set to 0.3 mm, 0.4 mm or 0.5 mm, which not only allows the first groove 322 to form a more obvious imprint on the outer side of the electrode terminal 3, which can be easily identified by the assembler through the equipment, but also reduces the influence of the first groove 322 on the structure of the electrode terminal 3, which is conducive to maintaining the structural strength of the electrode terminal 3.

[0124] In some embodiments, the depth of the first groove 322 in the axial direction of the recess 31 is B, and 0.1 mm≤B≤0.8 mm.

[0125] By setting the depth B of the first groove 322 in the axial direction of the recess 31 to a range of 0.1mm≤B≤0.8mm, the first groove 322 has a suitable depth, which not only enables the first groove 322 to form a more obvious mark on the outer side of the electrode terminal 3 and can be easily identified by the assembler through the equipment, but also reduces the influence of the first groove 322 on the structure of the electrode terminal 3, which is beneficial to maintaining the structural strength of the electrode terminal 3.

[0126] The depth B of the first groove 322 in the axial direction of the recess 31 is set to be in the range of 0.3 mm ≤ B ≤ 0.5 mm. For example, B can be set to 0.3 mm, 0.4 mm or 0.5 mm, which not only enables the first groove 322 to form a more obvious mark on the outer side of the electrode terminal 3, which can be easily identified by the assembler through the equipment, but also reduces the influence of the first groove 322 on the structure of the electrode terminal 3, which is conducive to maintaining the structural strength of the electrode terminal 3.

[0127] Exemplarily, the device for identifying the first groove 322 may be a graphic recognition device. Exemplarily, the graphic recognition device includes a signal-connected charge coupled device (CCD) camera and a processor. After the CCD camera collects image information of the side of the electrode terminal 3 having the positioning structure 32, the processor can process the image information to obtain the axis of the first groove 322 in the image, thereby obtaining the axis of the recess 31; when the cover plate 4 covers the recess 31, after the CCD camera collects image information from the side of the electrode terminal 3 having the positioning structure 32, the processor can process the image information to obtain the axis of the first groove 322 in the image and the axis of the cover plate 4, thereby obtaining the concentricity of the cover plate 4 and the recess 31.

[0128] In some embodiments, Figure 7 As shown, the positioning structure 32 includes a plurality of positioning portions 323 arranged at intervals along the circumference of the recess 31 .

[0129] The positioning portion 323 may be a partial structure in the positioning structure 32, and a plurality of positioning portions 323 disposed on the periphery of the recess 31 may form the positioning structure 32. By disposing a plurality of positioning portions 323 in the positioning structure 32 at intervals along the circumference of the recess 31, the positioning structure 32 formed by the plurality of positioning portions 323 is coaxial with the recess 31. Exemplarily, the plurality of positioning portions 323 may be a plurality of arc-shaped first grooves 322, or may be a plurality of arc-shaped protrusions 321.

[0130] In some embodiments, the positioning structure 32 is an annular structure disposed around the outer circumference of the recess 31 .

[0131] The positioning structure 32 is an annular structure disposed around the outer circumference of the recess 31 . The positioning structure 32 may extend along the circumference of the recess 31 and be disposed around the outer circumference of the recess 31 , so that the positioning structure 32 is coaxially sleeved on the outer side of the recess 31 .

[0132] Exemplarily, the recess 31 may be provided as a circular structure, and the positioning structure 32 may be provided as a circular ring shape concentric with the recess 31 , so that the processing of the positioning structure 32 and the recess 31 is relatively convenient.

[0133] In some embodiments, along the radial direction of the recess 31 , the minimum distance between the positioning structure 32 and the cover plate 4 is C, and 2 mm ≤ C ≤ 12 mm.

[0134] By setting the minimum distance C between the positioning structure 32 and the cover plate 4 along the radial direction of the recess 31 to 2mm≤C≤12mm, not only can sufficient space be reserved in the area close to the recess 31 to place the formation probe, but the positioning structure 32 can also be prevented from being too close to the edge of the electrode terminal 3, making it easier for the image recognition device to distinguish the positioning structure 32 from the edge of the electrode terminal 3.

[0135] The minimum distance C of the positioning structure 32 from the cover plate 4 along the radial direction of the recess 31 can be set to 4mm≤C≤10mm. Exemplarily, the minimum distance C of the positioning structure 32 from the cover plate 4 along the radial direction of the recess 31 can be 6mm, 8mm or 10mm, which can not only leave enough space in the area close to the recess 31 to place the formation probe, but also prevent the positioning structure 32 from being too close to the edge of the electrode terminal 3, so that the image recognition device can distinguish the positioning structure 32 from the edge of the electrode terminal 3.

[0136] Exemplarily, the side wall of the recess 31 is provided with a step surface, and the cover plate 4 is against the step surface. By connecting the cover plate 4 to the step surface, the cover plate 4 does not protrude too much from the surface of the electrode terminal 3 away from the electrode assembly 2. The bottom wall of the recess 31 is provided with a through hole in communication with the accommodating cavity, and the electrolyte can be injected into the accommodating cavity through the recess 31.

[0137] In some embodiments, the housing 1 includes a shell 11 and an end cover 12 , the shell 11 has an opening, and the end cover 12 covers the opening; the shell 11 includes an end wall 111 arranged opposite to the end cover 12 ; and the electrode terminal 3 is arranged on the end wall 111 .

[0138] The end cover 12 is sealed to the opening of the housing 11 , so that the accommodating cavity is a sealed cavity for accommodating other components of the battery cell 20 and electrolyte.

[0139] The end wall 111 can be a portion of the shell 11 that is arranged opposite to the opening. By arranging the electrode terminal 3 on the end wall 111, the shell 11 can provide more secure support for the electrode terminal 3, so that when the battery cell 20 is connected to an electrical device, the electrode terminal 3 can achieve electrical connection between the battery cell 20 and the electrical device by firmly abutting against the power input terminal of the electrical device.

[0140] Exemplarily, the housing 11 may be integrally formed by a stamping process.

[0141] In some embodiments, the electrode assembly 2 includes a second electrode tab 22 having a polarity opposite to that of the first electrode tab 21 , and the second electrode tab 22 is electrically connected to the end cap 12 .

[0142] The second electrode tab 22 may be a tab with opposite polarity to the first electrode tab 21. The second electrode tab 22 and the first electrode tab 21 may extend from opposite ends of the electrode assembly 2, respectively. The second electrode tab 22 is connected to the end cap 12, and the first electrode tab 21 is connected to the electrode terminal 3.

[0143] In some embodiments, the cap plate 4 is welded to the electrode terminal 3 .

[0144] The cover plate 4 is welded to the electrode terminal 3, and the cover plate 4 may be welded to the stepped surface of the side wall of the recess 31. Welding can melt the material of the cover plate 4 and the material of the electrode terminal 3 together, which is not only conducive to improving the connection firmness between the cover plate 4 and the electrode terminal 3, but also conducive to improving the sealing of the cover plate 4 covering the recess 31.

[0145] Some embodiments of the present application further provide a battery 100 , which includes a battery cell 20 provided by the above technical solution.

[0146] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0147] Some embodiments of the present application provide a battery cell 20, which includes a housing 1, an electrode assembly 2, an electrode terminal 3 and a cover plate 4. The housing 1 has a housing cavity, the electrode assembly 2 is disposed in the housing cavity and includes a first pole ear 21 and a second pole ear 22 disposed oppositely, the electrode terminal 3 is provided with a recess 31, the cover plate 4 is disposed on a side of the electrode terminal 3 away from the electrode assembly 2 and covers the recess 31, and a positioning structure 32 along the periphery of the recess 31 and concentric with the recess 31 is disposed on the side of the electrode terminal 3 away from the electrode assembly 2. Among them, the positioning structure 32 includes a first groove 322. The housing 1 includes a shell 11 and an end cover 12, the end cover 12 covers the opening of the shell 11, the electrode terminal 3 is electrically connected to the end wall 111 of the shell 11, the first pole ear 21 is connected to the electrode terminal 3, and the second pole ear 22 is electrically connected to the end cover 12. In the above structure, since a positioning structure 32 arranged along the outer periphery of the recess 31 is provided on the side of the electrode terminal 3 away from the electrode assembly 2, the position of the cover plate 4 can be determined by the positioning structure 32 during the assembly process of the battery cell 20 to obtain the concentricity of the cover plate 4 and the recess 31, which is beneficial to improving the concentricity of the cover plate 4 and the recess 31, improving the connection effect between the cover plate 4 and the electrode terminal 3, and further improving the sealing effect of the cover plate 4 on the recess 31, which helps to improve the yield rate of the battery cell 20 during the production process.

[0148] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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: A housing having a receiving cavity; An electrode assembly, disposed in the accommodating cavity and comprising a first electrode tab; An electrode terminal, disposed in the housing and electrically connected to the first electrode tab, wherein the electrode terminal is provided with a recess; The cover plate is arranged on a side of the electrode terminal away from the electrode assembly and covers the recess, wherein a positioning structure arranged along the periphery of the recess is arranged on the side of the electrode terminal away from the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The positioning structure is configured concentrically with the recess.

3. The battery cell according to claim 1, characterized in that: The positioning structure includes a protrusion, and the protrusion is arranged along the outer circumference of the recess.

4. The battery cell according to claim 3, characterized in that: Along the axial direction of the recess, an end of the protrusion away from the electrode assembly does not exceed the cover plate.

5. The battery cell according to claim 1, characterized in that: The positioning structure includes a first groove, and the first groove is arranged along the outer circumference of the recess.

6. The battery cell according to claim 5, characterized in that: The first groove has an opening facing away from the electrode assembly, and along the radial direction of the recess, the size of the opening is A, 0.1 mm≤A≤0.8 mm.

7. The battery cell according to claim 5, characterized in that: The first groove has a depth B in the axial direction of the recess, and 0.1 mm≤B≤0.8 mm.

8. The battery cell according to claim 1, characterized in that: The positioning structure includes a plurality of positioning portions arranged at intervals along the circumference of the recess.

9. The battery cell according to claim 1, characterized in that: The positioning structure is an annular structure arranged around the outer periphery of the recess.

10. The battery cell according to claim 1, characterized in that: Along the radial direction of the recess, the minimum distance between the positioning structure and the cover plate is C, 2mm≤C≤12mm.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, and the end cover covers the opening; the shell comprises an end wall arranged opposite to the end cover; The electrode terminal is arranged on the end wall.

12. The battery cell according to claim 11, characterized in that: The electrode assembly includes a second electrode tab having a polarity opposite to that of the first electrode tab, and the second electrode tab is electrically connected to the end cap.

13. The battery cell according to any one of claims 1 to 10, characterized in that: The cap plate is welded to the electrode terminal.

14. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: Comprising a battery as claimed in claim 14, the battery is used to provide electrical energy.

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