Battery cell, battery, and electrical device

Abstract

Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell comprises a casing, a first insulating piece, and a second insulating piece. The casing is provided with a first wall. The first insulating piece covers the outer side of the casing. At least part of the second insulating piece is located between the first wall and the first insulating piece and covers at least part of an outer surface of the first wall. The first insulating piece covers the casing, the first wall is a part of the casing, and the first insulating piece can perform insulation protection on the first wall of the casing; the second insulating piece covers at least part of the outer surface of the first wall, and the second insulating piece can perform insulation protection on at least part of the first wall; at least part of the second insulating piece is located between the first wall and the first insulating piece, and at least part of the second insulating piece and the first insulating piece can both perform insulation protection on the first wall, so that the insulation protection effect for the first wall is enhanced, and the reliability of the battery cell is improved.

Description

Battery cells, batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202323663762.3, filed on December 29, 2023, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] 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

[0003] The batteries most commonly used in vehicles are generally lithium-ion batteries. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.

[0004] Batteries generally include battery cells, which are usually covered with an insulating layer on the outside. During use, high-intensity electric fields are likely to exist around the battery cells, and high-intensity electric fields can easily break through the insulating layer of the battery cells, causing the insulating layer to fail. How to improve the insulation performance of battery cells to improve battery reliability is an urgent problem to be solved in battery technology. Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device to improve the reliability problem of the battery cell.

[0006] In a first aspect, embodiments of the present application provide a battery cell, comprising a housing, a first insulating member, and a second insulating member. The housing has a first wall. The first insulating member covers the outer surface of the housing. At least a portion of the second insulating member is positioned between the first wall and the first insulating member and covers at least a portion of the outer surface of the first wall.

[0007] In the above technical solution, the first insulating member is wrapped around the outer surface of the outer shell, providing insulation and protection for the outer shell. At least a portion of the second insulating member is located between the first wall and the first insulating member, and the second insulating member covers at least a portion of the outer surface of the first wall. This allows both the second insulating member and the first insulating member to provide insulation and protection for the first wall, thereby enhancing the insulation and protection of the first wall and improving the reliability of the battery cell.

[0008] In some embodiments, the second insulating member is an insulating coating disposed on the outer surface of the housing. Providing the insulating coating as the second insulating member helps the second insulating member adhere tightly to the housing, preventing it from falling off the housing, and providing long-term protection for the first wall. Furthermore, using the insulating coating as the second insulating member allows the second insulating member to be more evenly distributed on the outer surface of the housing.

[0009] In some embodiments, a recess is provided on the outer surface of the first wall, and the second insulating member covers the recess. By covering the recess with the second insulating member, the second insulating member can provide insulation protection for the area where the recess is provided, thereby enhancing the insulation performance of the recess.

[0010] In some embodiments, a portion of the second insulating member is located in the recess. The portion of the second insulating member disposed in the recess can make the second insulating member more stably attached to the outer surface of the first wall.

[0011] In some embodiments, the second insulating member fills the recess, which can squeeze out the gas in the recess and reduce the problem of accelerated aging of the second insulating member due to factors such as partial discharge in the recess area.

[0012] In some embodiments, the first wall forms a weakened portion in the area where the recess is provided, and the first wall is configured to rupture along the weakened portion to release pressure within the battery cell. Forming a weakened portion in the recess facilitates rupturing when pressure within the battery cell increases, allowing the interior of the battery cell to communicate with the exterior through the ruptured weakened portion, thereby facilitating pressure release within the battery cell and reducing the risk of thermal runaway.

[0013] In some embodiments, the entire second insulating member is located between the first wall and the first insulating member. The entire second insulating member and the first insulating member together cover the outer surface of the first wall, which is beneficial to improving the insulation performance of the first wall.

[0014] In some embodiments, a portion of the second insulating member is located between the first wall and the first insulating member. By arranging a portion of the second insulating member between the first wall and the first insulating member, the second insulating member and the first insulating member jointly cover the outer surface of the first wall, thereby improving the insulation performance of the first wall. In addition, the remaining portion of the second insulating member can cover other portions of the housing, thereby improving the insulation performance of other locations of the housing.

[0015] In some embodiments, the housing further comprises a sidewall, the sidewall being disposed around the first wall, the first wall being connected to one end of the sidewall along the thickness direction of the first wall. The second insulating member comprises a first insulating portion and a second insulating portion, the second insulating portion being disposed around the first insulating portion, the first insulating portion being connected to one end of the second insulating portion along the thickness direction of the first wall, the first insulating portion being located between the first wall and the first insulating member and covering the outer surface of the first wall, and the second insulating portion being located between the sidewall and the first insulating member, surrounding the sidewall and covering at least a portion of the outer surface of the sidewall. By arranging the first insulating part between the first wall and the first insulating member, the insulation performance of the first wall can be enhanced by the first insulating member and the first insulating part. By arranging the second insulating part between the side wall and the first insulating member, the insulation performance of the side wall can be enhanced by the first insulating member and the second insulating part. By surrounding the second insulating part so that the second insulating part is arranged on the side wall close to the first wall, and the first insulating part is connected to one end of the second insulating part along the thickness direction of the first wall, the second insulating member can cover the first wall and the connection between the first wall and the side wall, thereby improving the insulation performance of the first wall of the shell and the position on the side wall of the shell close to the first wall.

[0016] In some embodiments, the second insulating member covers the entire outer surface of the first wall. By covering the entire outer surface of the first wall with the second insulating member, the first insulating member and the second insulating member can jointly insulate the entire outer surface of the first wall, thereby improving the insulation performance of the first wall and reducing the risk of breakdown of the insulating layer on the first wall.

[0017] In some embodiments, the battery cell further comprises an electrode assembly, which is housed within the housing. The first wall is configured to support the electrode assembly. The electrode assembly is supported by the first wall, which is located at the bottom of the electrode assembly. A first insulating member and a second insulating member covering the outer surface of the first wall are located at the bottom of the housing. When the housing is supported by an external component, the first insulating member and the second insulating member can insulate the housing from the external component.

[0018] In some embodiments, the housing includes a shell and an end cap, the shell having at least one opening; the end cap corresponds to the opening in a one-to-one relationship and closes the opening; at least one end cap is a first wall. A second insulating member covers at least a portion of the at least one end cap, and the first and second insulating members can collectively improve the insulation performance of the at least one end cap.

[0019] In some embodiments, the shell has only one opening, and the insulation performance of the end cover of the shell can be improved by covering the end cover at the shell opening with the second insulating member.

[0020] In some embodiments, the housing includes a shell and an end cap, the shell having at least one opening; the end cap corresponding to the opening and sealing the opening; and the shell including a first wall. The second insulating member covering the first wall of the shell can improve the insulation performance of the first wall of the shell.

[0021] In some embodiments, the housing has only one opening, and the wall of the housing opposite to the end cap is the first wall. By setting the wall of the housing opposite to the end cap as the first wall, the insulation performance of the first wall can be improved.

[0022] In a second aspect, an embodiment of the present application provides a battery, which includes a plurality of battery cells provided by any embodiment of the first aspect.

[0023] In a third aspect, an embodiment of the present application provides an electric device, which includes a plurality of battery cells provided by any embodiment of the first aspect, and the battery cells are used to provide electrical energy to the electric device.

[0024] 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

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0026] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0027] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0028] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0029] FIG4 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0030] FIG5 is an exploded view of a battery cell provided in some other embodiments of the present application;

[0031] FIG6 is a schematic structural diagram of the second insulating member in FIG5 ;

[0032] FIG7 is a schematic structural diagram of the housing in FIG5 ;

[0033] FIG8 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0034] FIG9 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application;

[0035] In the drawings, the drawings are not drawn to scale.

[0036] Marking instructions: 1-shell; 11-shell; 12-end cover; 11a-opening; 13-first wall; 131-recess; 132-weak part; 14-side wall; 15-rounded corner; 2-electrode assembly; 21-ear; 3-electrode terminal; 4-first insulating member; 5-second insulating member; 5a-protrusion; 51-first insulating portion; 52-second insulating portion; 10-battery cell; 20-case; 201-first part; 202-second part; 100-battery; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0037] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0042] 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; 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.

[0043] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0045] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0046] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0047] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0048] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0049] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base 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 a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0050] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as 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 at least one of lithium iron phosphate (such as LiFePO4 (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 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, LiMn2O4), 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 ), LiNi 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 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0051] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a 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.

[0052] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0053] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, the metal foil may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. The composite current collector may include a polymer 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, or silver alloy, etc.) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0054] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0055] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0056] 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.

[0057] 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.

[0058] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0059] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. 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 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0062] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0063] In some embodiments, the solvent may include 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 may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0064] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0065] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0066] 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.

[0067] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0068] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0069] 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.

[0070] In some embodiments, the electrode assembly is a laminate structure.

[0071] 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.

[0072] 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.

[0073] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0074] 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.

[0075] 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.

[0076] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0077] 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.

[0078] 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.

[0079] 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. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0085] Batteries generally consist of single cells and external components. External components can be used to secure and cool the battery cells, such as housings, support frames, protective plates, and cooling plates. Because these external components may carry high voltage, they expose the battery cells to high-intensity electric fields, which can affect the battery's reliability and service life.

[0086] To improve the insulation performance of battery cells, insulating members can be installed on the outer surface of the battery cell housing to provide insulation protection for the battery cells in high-intensity electric field environments. However, this external member is typically located facing a wall of the battery cell housing. In high-intensity electric field environments, the portion of the insulating member located between the wall and the external member still faces the risk of breakdown and failure due to the high-intensity electric field, affecting the reliability of the battery cell.

[0087] In view of this, an embodiment of the present application provides a battery cell, which includes a shell, a first insulating member and a second insulating member. The shell has a first wall, and the first insulating member is covered on the outside of the shell of the battery cell. At least a portion of the second insulating member is arranged between the first insulating member and the first wall of the shell, and covers at least a portion of the outer surface of the first wall.

[0088] In such a battery cell, by arranging the second insulating member between the first insulating member and the first wall, both the first insulating member and the second insulating member can insulate the first wall, thereby enhancing the insulation protection effect of the first wall and improving the reliability of the battery cell.

[0089] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0090] Electrically powered equipment 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 the electric device as a vehicle as an example.

[0092] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed within vehicle 1000. Battery 100 can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000, for example, as an operating power source for vehicle 1000.

[0093] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0094] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0095] Please refer to FIG. 2 , which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a battery cell 10 and a box 20 . The box 20 is used to accommodate the battery cell 10 .

[0096] The housing 20 is a component that houses the battery cells 10 and provides a storage space for the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202, which overlap to define a storage space for the battery cells 10. The first portion 201 and the second portion 202 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 201 can be a hollow structure with one side open, and the second portion 202 can also be a hollow structure with one side open. The open side of the second portion 202 overlaps the open side of the first portion 201, forming the housing 20 with a storage space. Alternatively, the first portion 201 can be a hollow structure with one side open, and the second portion 202 can be a plate-like structure. The second portion 202 overlaps the open side of the first portion 201, forming the housing 20 with a storage space. The first portion 201 and the second portion 202 can be sealed by a sealing element, which can be a sealing ring, sealant, etc.

[0097] In the battery 100, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection. Hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection to form a battery module 100. The multiple battery modules 100 can then be connected in series, parallel, or in a hybrid connection to form a single unit and housed within the housing 20. Alternatively, all battery cells 10 can be directly connected in series, parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 10 can be housed within the housing 20.

[0098] In some embodiments, the battery 100 may further include a busbar component, through which the multiple battery cells 10 can be electrically connected to each other, thereby enabling series connection, parallel connection, or hybrid connection of the multiple battery cells 10. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0099] Please refer to Figure 3, which is an exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 may include a housing 1, an electrode assembly 2, and an electrode terminal 3. The electrode assembly 2 is disposed within the housing 1, and the electrode terminal 3 is disposed on the housing 1 and electrically connected to the electrode assembly 2.

[0100] The housing 1 may include a shell 11 and an end cover 12 . The shell 11 has an opening 11 a . The end cover 12 closes the opening 11 a of the shell 11 .

[0101] The housing 11 is a component for accommodating the electrode assembly 2. The housing 11 may be a hollow structure with an opening 11a formed at one end, or may be a hollow structure with openings 11a formed at opposite ends. The housing 11 may have various shapes, such as a cylinder or a rectangular parallelepiped. The housing 11 may be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0102] The end cap 12 is a component that closes the opening 11a of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the shell 11 together define a receiving space for accommodating the electrode assembly 2, electrolyte and other components. The end cap 12 can be connected to the shell 11 by welding or rolling to close the opening 11a of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0103] In an embodiment where the housing 11 has an opening 11a formed at one end, one end cap 12 may be provided. In an embodiment where the housing 11 has openings 11a formed at opposite ends, two end caps 12 may be provided. The two end caps 12 respectively close the two openings 11a of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space.

[0104] The electrode terminals 3 are provided on the outer casing 1 and are used to electrically connect to the tabs 21 of the electrode assembly 2 to output electrical energy from the battery cell 10. The electrode terminals 3 can be provided on the shell 11 of the outer casing 1 or on the end caps 12 of the outer casing 1. The electrode terminals 3 and the tabs 21 can be directly connected, for example, by welding the electrode terminals 3 to the tabs 21. The electrode terminals 3 and the tabs 21 can also be indirectly connected, for example, by connecting the electrode terminals 3 to the tabs 21 indirectly through a current collecting member. The current collecting member can be a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0105] As an example, as shown in FIG3 , along a first direction X, an opening 11a is formed at one end of the housing 11. The housing 1 has a single end cap 12, which closes the opening 11a of the housing 11. Two electrode terminals 3 are provided on the end cap 12, spaced apart along a second direction Y. The two electrode terminals 3 are respectively a positive electrode terminal 3 and a negative electrode terminal 3. Two electrode assemblies 2 are arranged along a third direction Z. Positive and negative electrode tabs are formed on the ends of the two electrode assemblies 2 facing the end cap 12. The positive electrode terminal 3 is electrically connected to the two positive tabs, and the negative electrode terminal 3 is electrically connected to the two negative tabs. The first direction X, the second direction Y, and the third direction Z intersect with each other. The first direction X may be the height direction of the battery cell 10, the second direction Y may be the width direction of the battery cell 10, and the third direction Z may be the thickness direction of the battery cell 10.

[0106] According to some embodiments of the present application, referring to FIG. 4 , FIG. 4 is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application. Battery cell 10 includes a housing 1, a first insulating member 4, and a second insulating member 5. Housing 1 has a first wall 13. First insulating member 4 covers the outer surface of housing 1. At least a portion of second insulating member 5 is located between first wall 13 and first insulating member 4, covering at least a portion of the outer surface of first wall 13.

[0107] In the housing 1, the first wall 13 can be one or more. The end cap 12 of the housing 1 can be the first wall 13, or at least one wall of the shell 11 of the housing 1 can be the first wall 13. Taking the example of the first wall 13 being located in the shell 11 and the shell 11 being in the shape of a rectangular parallelepiped, the first wall 13 can be the wall of the shell 11 in the width direction of the battery cell 10; it can also be the wall of the shell 11 in the thickness direction of the battery cell 10; or it can be the wall of the shell 11 in the height direction of the battery cell 10, with an opening 11a formed at at least one end of the shell 11 in the height direction. As an example, in Figure 4, the first wall 13 is the wall of the shell 11 in the height direction of the battery cell 10.

[0108] The first insulating member 4 is a component that insulates and isolates the outer shell 1 from external components. The first insulating member 4 can be an insulating film, an insulating shell, or the like on the outside of the outer shell 1. The number of first insulating members 4 can be one or more, and multiple first insulating members 4 can cover the outer shell 1 together. For example, one first insulating member 4 covers the outer surface of the shell 11, and another first insulating member 4 covers the outer surface of the end cap 12. The first insulating member 4 can cover the entire outer shell 1, or only a portion of the outer shell 1. As an example, the first insulating member 4 is an insulating film, and the first insulating member 4 covers the shell 11 of the outer shell 1 to cover the outer surface of the shell 11.

[0109] The second insulating member 5 is an insulating component provided between the first insulating member 4 and the housing 1. The material of the first insulating member 4 and the second insulating member 5 may be the same or different. The second insulating member 5 may be an insulating coating, an insulating film, or the like.

[0110] A portion of the second insulating member 5 may be located between the first insulating member 4 and the first wall 13, and another portion may be located outside other walls of the housing 1. Alternatively, the entire second insulating member 5 may be located between the first insulating member 4 and the first wall 13. The second insulating member 5 may cover the entire outer surface of the first wall 13, or only a portion of the outer surface of the first wall 13.

[0111] In the above technical solution, the first insulating member 4 is wrapped around the outside of the housing 1, and the first insulating member 4 can insulate and protect the housing 1. At least a portion of the second insulating member 5 is located between the first wall 13 and the first insulating member 4, and the second insulating member 5 covers at least a portion of the outer surface of the first wall 13, so that the second insulating member 5 and the first insulating member 4 can both provide insulation and protection for the first wall 13, thereby strengthening the insulation protection effect of the first wall 13. When the first wall 13 is arranged to face the external component, even if the external component is in a high-voltage environment, the risk of insulation failure of the battery cell 10 can be reduced, thereby improving the reliability of the battery cell 10.

[0112] In some embodiments, referring to FIG. 4 , the second insulating member 5 is an insulating coating disposed on the outer surface of the housing 1 .

[0113] The insulating coating may be provided on the outer surface of the housing 1 by electrophoresis, spray coating, or the like. The insulating coating may cover a portion of the outer surface of the first wall 13 or the entire outer surface of the first wall 13. The insulating coating may cover only the outer surface of the first wall 13 or the outer surfaces of the other walls of the housing 1 except the outer surface of the first wall 13.

[0114] By setting an insulating coating as the second insulating part 5, it helps the second insulating part 5 to fit tightly to the shell 1, so that the second insulating part 5 is not easy to fall off the shell 1. The insulating coating is used as the second insulating part 5, so that the second insulating part 5 can be distributed more evenly on the outer surface of the shell 1.

[0115] In some embodiments, the insulating coating is made of epoxy resin, fluoroplastic, or polyimide.

[0116] The material of the insulating coating can be made of one of polyimide, epoxy resin and fluoroplastic as the main component, or can be made of a mixture of multiple of polyimide, epoxy resin and fluoroplastic as the main component.

[0117] In some embodiments, referring to Figures 5, 6, and 7, Figure 5 is an exploded view of a battery cell 10 provided in yet another embodiment of the present application, Figure 6 is a schematic structural diagram of the second insulating member 5 in Figure 5, and Figure 7 is a schematic structural diagram of the housing 1 in Figure 5. A recess 131 is provided on the outer surface of the first wall 13, and the second insulating member 5 covers the recess 131.

[0118] The number of recesses 131 can be one or more. The recess 131 can be a groove provided on the outer surface of the first wall 13, such as a weight-reducing groove or a pressure-relief groove provided on the outer surface of the first wall 13. Alternatively, the recess 131 can be a hole provided on the outer surface of the first wall 13, such as an injection hole or a pressure-relief hole provided on the outer surface of the first wall 13. The injection hole is used to inject electrolyte into the interior of the battery cell 10, and the pressure-relief hole is used to install a pressure-relief component, such as an explosion-proof valve, an explosion-proof disk, or a safety valve.

[0119] The second insulating member 5 covers the recess 131 , and thus the second insulating member 5 can provide insulation protection for the region where the recess 131 is provided, thereby enhancing the insulation performance of the recess 131 .

[0120] In some embodiments, a portion of the second insulating member 5 is located in the recess 131 .

[0121] A portion of the second insulating member 5 forms a protrusion 5a, which is located in the recess 131. The protrusion 5a is the portion of the second insulating member 5 located in the recess 131. The protrusion 5a may fill the entire recess 131 or only partially fill a portion of the recess 131.

[0122] By arranging a portion of the second insulating member 5 in the recess 131 , the second insulating member 5 can be more stably attached to the outer surface of the first wall 13 .

[0123] In some embodiments, as shown in FIG. 7 , the first wall 13 forms a weak portion 132 in the region where the recess 131 is provided. The first wall 13 is configured to be ruptured along the weak portion 132 to release pressure inside the battery cell 10 .

[0124] It can be understood that the recess 131 is a pressure relief groove. The weak portion 132 is the remaining portion after the recess 131 is provided on the first wall 13, and the bottom wall of the pressure relief groove may be the weak portion 132. Taking the recess 131 as an example of a pressure relief groove, the pressure relief groove can be formed in a variety of ways, such as stamping, milling, etc. The pressure relief groove may include at least one groove segment, and the cross-section of the groove segment may have a variety of shapes, such as rectangular, trapezoidal, etc. The cross-section of the groove segment is perpendicular to the extension direction of the groove segment. The shape of the pressure relief groove may be various, for example, the pressure relief groove is a groove extending along an arc trajectory, and for another example, the pressure relief groove includes multiple groove segments, and the multiple groove segments may form U-shaped, H-shaped, V-shaped, Y-shaped, X-shaped, T-shaped and other structures.

[0125] The formation of the weak portion 132 by the recess 131 is conducive to the weak portion 132 being able to rupture when the internal pressure of the battery cell 10 increases, so that the first wall 13 has a pressure relief function, which facilitates the battery cell 10 to release the internal pressure and reduces the risk of explosion when the battery cell 10 has thermal runaway.

[0126] In some embodiments, the second insulating member 5 fills the recess 131 .

[0127] The protrusion 5 a of the second insulating member 5 fills up the recess 131 .

[0128] The second insulating member 5 filling the recess 131 can squeeze the gas in the recess 131 out of the recess 131 , thereby reducing the problem of aggravated aging of the second insulating member 5 due to factors such as partial discharge in the recess 131 area.

[0129] In some embodiments, referring still to FIG. 4 , the entire second insulating member 5 is located between the first wall 13 and the first insulating member 4 .

[0130] It can be understood that the second insulating member 5 has no portion located on other walls of the housing 1 .

[0131] The second insulating member 5 may cover a portion of the outer surface of the first wall 13 , or may cover the entire outer surface of the first wall 13 .

[0132] The entire second insulating member 5 and the first insulating member 4 together cover the outer surface of the first wall 13 , which is beneficial to improving the insulation performance of the first wall 13 .

[0133] In some embodiments, please refer to FIG8 , which is a schematic structural diagram of a battery cell 10 provided in some other embodiments of the present application. A portion of the second insulating member 5 is located between the first wall 13 and the first insulating member 4 .

[0134] A portion of the second insulating member 5 may be located between the first wall 13 and the first insulating member 4, and another portion of the second insulating member 5 may be located outside the other walls of the housing 1. The portion of the second insulating member 5 located between the first wall 13 and the first insulating member 4 may cover part or all of the outer surface of the first wall 13.

[0135] By arranging a portion of the second insulating member 5 between the first wall 13 and the first insulating member 4, the second insulating member 5 and the first insulating member 4 jointly cover the outer surface of the first wall 13, thereby improving the insulation performance of the first wall. In addition, other portions of the second insulating member 5 can cover other portions of the outer shell 1, thereby improving the insulation performance of other positions of the outer shell 1.

[0136] 8 , in some embodiments, the housing 1 further includes a side wall 14, which surrounds the first wall 13. The first wall 13 is connected to one end of the side wall 14 along the thickness direction of the first wall 13. The second insulating member 5 includes a first insulating portion 51 and a second insulating portion 52. The second insulating portion 52 surrounds the first insulating portion 51. The first insulating portion 51 is connected to one end of the second insulating portion 52 along the thickness direction of the first wall 13. The first insulating portion 51 is located between the first wall 13 and the first insulating member 4 and covers the outer surface of the first wall 13. The second insulating portion 52 is located between the side wall 14 and the first insulating member 4. The second insulating portion 52 surrounds the side wall 14 and covers at least a portion of the outer surface of the side wall 14.

[0137] The side wall 14 may include multiple walls. Taking the case where the housing 1 is in the shape of a rectangular parallelepiped as an example, the side wall 14 may include four walls, which are arranged around the first wall 13. The four walls may all be walls in the housing 11, or some may be end caps 12 and the other may be walls in the housing 11. In the embodiment where the first wall 13 is the end cap 12, the four walls in the housing 11 may form the side wall 14. In the embodiment where the first wall 13 is a wall in the housing 11, the housing 11 has five walls, four of which form the side wall 14, and the other wall is the first wall 13.

[0138] The outer surface of the side wall 14 may be directly connected to the outer surface of the first wall 13 or indirectly connected. In the embodiment shown in FIG8 , the outer surface of the side wall 14 is indirectly connected to the outer surface of the first wall 13 via a fillet 15 .

[0139] The first insulating portion 51 is the portion of the second insulating member 5 located between the first insulating member 4 and the first wall 13. The second insulating portion 52 is the portion of the second insulating member 5 located between the first insulating member 4 and the side wall 14. The first insulating portion 51 and the second insulating portion 52 can be separate components or integrally formed. In embodiments where the second insulating member 5 is an insulating coating disposed between the housing 1 and the first insulating member 4, the first insulating portion 51 and the second insulating portion 52 can be integrally formed.

[0140] The second insulating portion 52 is a structure disposed around the side wall 14. It extends from the first insulating portion 51 toward the wall of the housing 1 opposite the first wall 13 along the thickness direction of the first wall 13. The second insulating portion 52 may cover a portion of the outer surface of the side wall 14 or the entire outer surface of the side wall 14.

[0141] As an example, as shown in Figure 8, the thickness direction of the first wall 13 is parallel to the first direction X. Along the first direction X, the shell 1 is in the shape of a rectangular parallelepiped, two walls of the side wall 14 are arranged opposite to each other along the second direction Y, and the other two walls of the side wall 14 are arranged opposite to each other along the third direction Z (not shown in Figure 8).

[0142] By arranging the first insulating portion 51 between the first wall 13 and the first insulating member 4, the insulation performance of the first wall 13 can be enhanced by the first insulating member 4 and the first insulating portion 51. By arranging the second insulating portion 52 between the side wall 14 and the first insulating member 4, the insulation performance of the side wall 14 can be enhanced by the first insulating member 4 and the second insulating portion 52. By arranging the second insulating portion 52 around the first insulating portion 51 so that the second insulating portion 52 is arranged on the side wall 14 close to the first wall 13, and the first insulating portion 51 is connected to one end of the second insulating portion 52 along the thickness direction of the first wall 13, the second insulating member 5 can cover the first wall 13 and the connection between the first wall 13 and the side wall 14, thereby improving the insulation performance of the first wall 13 of the shell 1 and the position on the side wall 14 of the shell 1 close to the first wall 13.

[0143] In some embodiments, referring still to FIG. 4 and FIG. 8 , the second insulating member 5 covers the entire outer surface of the first wall 13 .

[0144] By covering the entire outer surface of the first wall 13 with the second insulating member 5, the first insulating member 4 and the second insulating member 5 can jointly insulate the entire outer surface of the first wall 13, thereby improving the insulation performance of the first wall 13 and reducing the risk of breakdown of the insulating layer on the first wall 13.

[0145] In some embodiments, the battery cell 10 further includes an electrode assembly 2 , which is accommodated in the housing 1 , and the first wall 13 is configured to support the electrode assembly 2 .

[0146] It is understood that the first wall 13 is located at the bottom of the electrode assembly 2 to bear the gravity of the electrode assembly 2, thereby supporting the electrode assembly 2. The first wall 13 can directly support the electrode assembly 2, for example, the first wall 13 is located at the bottom of the electrode assembly 2 and directly contacts the electrode assembly 2; the first wall 13 can also indirectly support the electrode assembly 2, for example, a bottom support plate is provided between the first wall 13 and the electrode assembly 2, and the first wall 13 indirectly supports the electrode assembly 2 through the bottom support plate.

[0147] The electrode assembly 2 is supported by a first wall 13, and the first wall 13 is located at the bottom of the electrode assembly 2. The first insulating member 4 and the second insulating member 5 covering the outer surface of the first wall 13 are located at the bottom of the outer shell 1. When the outer shell 1 is supported by external components, the first insulating member 4 and the second insulating member 5 can insulate the outer shell 1 from the external components.

[0148] In some embodiments, please refer to FIG. 9 , which is a schematic diagram of the structure of a battery cell 10 provided in some further embodiments of the present application. The housing 1 includes a shell 11 and an end cap 12 . The shell 11 has at least one opening 11a . The end cap 12 corresponds to the opening 11a and closes the opening 11a . At least one end cap 12 is a first wall 13 .

[0149] The shell 11 may have one opening 11a, and one end cover 12 may close the opening 11a; the shell 11 may have two openings 11a, and the two end covers 12 may close the two openings 11a of the shell 11 respectively, and both end covers 12 may serve as the first wall 13, or one of the two end covers 12 may serve as the first wall 13.

[0150] By covering at least a portion of the at least one end cover 12 with the second insulating member 5 , the first insulating member 4 and the second insulating member 5 can jointly improve the insulation performance of the at least one end cover 12 .

[0151] In some embodiments, the housing 11 has only one opening 11 a .

[0152] As an example, the shell 11 has an opening 11a along the first direction X, and an end cover 12 is provided to cover the opening 11a. The end cover 12 serves as the first wall 13. The second insulating member 5 can cover the entire end cover 12, and the second insulating member 5 can cover the outer surface of the wall of the shell 11 adjacent to the opening 11a.

[0153] By covering the end cover 12 at the opening 11 a of the shell 11 with the second insulating member 5 , the insulation performance at the end cover 12 of the housing 1 can be improved.

[0154] In some embodiments, the housing 1 includes a shell 11 and an end cover 12 . The shell 11 has at least one opening 11 a . The end cover 12 corresponds to the opening 11 a one-to-one and closes the opening 11 a . The shell 11 includes a first wall 13 .

[0155] The shell 11 may be provided with two openings 11a, and the side wall 14 of the outer shell 1 may include the end cover 12 and the wall on the shell 11; the shell 11 may be provided with one opening 11a and the first wall 13 is the wall on the shell 11 opposite to the opening 11a, and the side wall 14 is the wall on the shell 11; the shell 11 may be provided with one opening 11a and the first wall 13 is the wall on the shell 11 adjacent to the opening 11a, and the side wall 14 may be the end cover 12 and the wall on the shell 11.

[0156] By covering the first wall 13 of the housing 11 with the second insulating member 5 , the insulation performance of the first wall 13 of the housing 11 can be improved.

[0157] In some embodiments, the housing 11 has only one opening 11 a , and a wall of the housing 11 opposite to the end cover 12 is a first wall 13 .

[0158] As an example, the housing 11 has only one opening 11 a , and a wall of the housing 11 opposite to the end cover 12 is a first wall 13 , and the side wall 14 is a wall of the housing 11 adjacent to the first wall 13 .

[0159] By providing the wall of the housing 11 opposite to the end cover 12 as the first wall 13 , the insulation performance of the first wall 13 can be improved.

[0160] An embodiment of the present application provides a battery 100 , which includes a battery cell 10 provided in any one of the above embodiments.

[0161] An embodiment of the present application provides an electric device, which includes a battery cell 10 provided by any one of the above embodiments. The battery cell 10 is used to provide electric energy to the electric device.

[0162] Referring to FIG. 8 , an embodiment of the present application further provides a battery cell 10 comprising a housing 1, a first insulating member 4, and a second insulating member 5. The second insulating member 5 is positioned between the housing 1 and the first insulating member 4. The bottom wall of the housing 1 is a first wall 13, and the wall of the housing 1 adjacent to the first wall 13 is a side wall 14. The first insulating member 4 covers the first wall 13 and the side wall 14 of the housing 1. The second insulating member 5 comprises a first insulating portion 51 and a second insulating portion 52. The first insulating portion 51 covers the entire outer surface of the first wall 13, and the second insulating portion 52 covers the side wall 14 and is connected to the first insulating portion 51, so that the second insulating member 5 covers the fillet 15 between the first wall 13 and the side wall 14. The second insulating member 5 is an insulating coating.

[0163] By arranging a first insulating portion 51 between the first wall 13 and the first insulating member 4, the insulating performance of the first wall 13 can be enhanced. By arranging a second insulating portion 52 connected to the first insulating portion 51 and covering a part of the side portion, the second insulating member 5 can completely cover the first wall 13 and the fillet 15 between the first wall 13 and the side wall 14, thereby reducing the risk of the insulating layer at the first wall 13 being punctured and improving the reliability of the battery cell 10.

[0164] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: a housing having a first wall; a first insulating member covering the outside of the housing; a second insulating member, at least a part of the second insulating member being located between the first wall and the first insulating member and covering at least a part of the outer surface of the first wall.

2. The battery cell according to claim 1, wherein, The second insulating member is an insulating coating provided on the outer surface of the housing.

3. The battery cell according to claim 1 or 2, wherein A recess is provided on the outer surface of the first wall, and the second insulating member covers the recess.

4. The battery cell according to claim 3, wherein, A part of the second insulating member is located within the recess.

5. The battery cell according to claim 4, wherein The second insulating member fills the recess.

6. The battery cell according to any one of claims 3-5, wherein, The first wall forms a weak portion in the region where the recess is provided, and the first wall is configured to be able to crack along the weak portion to release the pressure inside the battery cell.

7. The battery cell according to any one of claims 1-6, wherein, All of the second insulating member is located between the first wall and the first insulating member.

8. The battery cell according to any one of claims 1-6, wherein, A part of the second insulating member is located between the first wall and the first insulating member.

9. The battery cell according to claim 8, wherein, The housing further has a side wall surrounding the first wall, and the first wall is connected to one end of the side wall in the thickness direction of the first wall; The second insulating member includes a first insulating portion and a second insulating portion, the second insulating portion surrounding the first insulating portion, the first insulating portion being connected to one end of the second insulating portion in the thickness direction of the first wall, the first insulating portion being located between the first wall and the first insulating member and covering the outer surface of the first wall, the second insulating portion being located between the side wall and the first insulating member, the second insulating portion surrounding the side wall and covering at least a part of the outer surface of the side wall.

10. The battery cell according to any one of claims 1-9, wherein, The second insulating member covers the entire outer surface of the first wall.

11. The battery cell according to any one of claims 1-10, wherein, The battery cell further includes an electrode assembly received in the housing, and the first wall is configured to support the electrode assembly.

12. The battery cell according to any one of claims 1-10, wherein, The housing includes: a housing body having at least one opening; end caps corresponding to the openings one by one, the end caps closing the openings; wherein at least one of the end caps is the first wall.

13. The battery cell according to claim 12, wherein, The housing body has only one such opening.

14. The battery cell according to any one of claims 1-11, wherein, The housing includes: a housing body having at least one opening; end caps corresponding to the openings one by one, the end caps closing the openings; wherein the housing body includes the first wall.

15. The battery cell according to claim 14, wherein, The housing body has only one such opening, and the wall of the housing body opposite to the end cap is the first wall.

16. A battery, comprising the battery cell according to any one of claims 1-15.

17. An electrical device, the electrical device including the battery cell according to any one of claims 1-15, the battery cell being used to supply electrical energy to the electrical device.

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