Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, a first insulating part and a second insulating part, the housing has a first wall. The first insulating part wraps the outer side of the shell. At least a portion of the second insulator is located between the first wall and the first insulator and covers at least a portion of an outer surface of the first wall. The first insulating part wraps the shell, the first wall is a part of the shell, and the first insulating part can insulate and protect the first wall of the shell; the second insulating part covers at least one part of the outer surface of the first wall, and the second insulating part can insulate and protect at least one part of the first wall; at least one part of the second insulating part is located between the first wall and the first insulating part, and the at least one part of the second insulating part and the first insulating part can perform insulating protection on the first wall, so that the insulating protection effect of the first wall is enhanced, and the reliability of the single battery is improved.

Description

Technical Field

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

[0002] The batteries used most 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.

[0003] A battery generally includes a battery cell, and the outside of the battery cell is usually covered with an insulating layer. When the battery cell is in use, a high-intensity electric field is likely to exist around the battery cell. The high-intensity electric field can easily break through the insulating layer of the battery cell, causing the insulating layer to fail. How to improve the insulation performance of the battery cell to improve the reliability of the battery is an urgent problem to be solved in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery and an electrical device to improve the reliability problem of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell comprising a housing, a first insulating member, and a second insulating member. The housing has a first wall. The first insulating member is coated on the outer side of the housing. At least a portion of the second insulating member is located between the first wall and the first insulating member and covers at least a portion of the outer surface of the first wall.

[0006] In the above technical solution, the first insulating member is coated on the outer side of the shell, and the first insulating member can insulate and protect the shell. At least a part 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 part of the outer surface of the first wall, so that the second insulating member and the first insulating member can both insulate and protect the first wall, thereby enhancing the insulation protection effect of the first wall and improving the reliability of the battery cell.

[0007] 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 to fit tightly to the housing, so that the second insulating member is not easy to fall off the housing, so that the second insulating member can provide good long-term protection for the first wall. In addition, the insulating coating as the second insulating member can make the second insulating member more evenly distributed on the outer surface of the housing.

[0008] In some embodiments, the outer surface of the first wall is provided with a recess, 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.

[0009] In some embodiments, a portion of the second insulating member is located in the recess. A portion of the second insulating member is disposed in the recess, which can make the second insulating member more stably attached to the outer surface of the first wall.

[0010] In some embodiments, the second insulating member fills the concave portion. The second insulating member filling the concave portion can squeeze the gas in the concave portion out of the concave portion, thereby reducing the problem of aggravated aging of the second insulating member due to factors such as partial discharge in the concave region.

[0011] In some embodiments, the first wall forms a weak portion in the area where the recess is provided, and the first wall is configured to be able to rupture along the weak portion to release the pressure inside the battery cell. The recess forming the weak portion is conducive to the weak portion being able to rupture when the pressure inside the battery cell increases, so that the inside of the battery cell is connected to the outside through the ruptured weak portion, thereby facilitating the release of pressure from the battery cell and reducing the risk of thermal runaway of the battery cell.

[0012] 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.

[0013] 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, and in addition, other portions of the second insulating member can cover other portions of the housing, thereby improving the insulation performance of other positions of the housing.

[0014] In some embodiments, the housing further comprises a side wall, the side wall is arranged around the first wall, and the first wall is connected to one end of the side wall 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 is arranged around the first insulating portion, the first insulating portion is connected to one end of the second insulating portion along the thickness direction of the first wall, the first insulating portion is located between the first wall and the first insulating member, and covers the outer surface of the first wall, the second insulating portion is located between the side wall and the first insulating member, the second insulating portion is arranged around the side wall, and covers at least a portion of the outer surface of the side wall. 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 around the first 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.

[0015] 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 the insulating layer on the first wall being broken down.

[0016] In some embodiments, the battery cell further comprises an electrode assembly, the electrode assembly is contained in the housing, and the first wall is configured to support the electrode assembly. The electrode assembly is supported by the first wall, the first wall is located at the bottom of the electrode assembly, the first insulating member and the second insulating member covering the outer surface of the first wall are located at the bottom of the housing, and when the housing is supported by the external component, the housing and the external component can be insulated by the first insulating member and the second insulating member.

[0017] In some embodiments, the housing includes a shell and an end cover, the shell has at least one opening; the end cover corresponds to the opening one by one, and the end cover closes the opening; wherein at least one end cover is a first wall. By covering at least a portion of at least one end cover with a second insulating member, the first insulating member and the second insulating member can jointly improve the insulation performance of at least one end cover.

[0018] 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.

[0019] In some embodiments, the housing includes a shell and an end cover, the shell has at least one opening, the end cover corresponds to the opening one by one, and the end cover closes the opening, wherein the shell includes a first wall. By covering the first wall on the shell with the second insulating member, the insulation performance of the first wall on the shell can be improved.

[0020] 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.

[0021] In a second aspect, an embodiment of the present application provides a battery, the battery comprising a plurality of battery cells provided by any one embodiment of the first aspect.

[0022] In a third aspect, an embodiment of the present application provides an electrical device, the electrical device comprising a plurality of battery cells provided by any one embodiment of the first aspect, the battery cells being used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0025] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0026] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0027] Figure 4 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0028] Figure 5 An exploded view of a battery cell provided in some other embodiments of the present application;

[0029] Figure 6 for Figure 5 A schematic structural diagram of the second insulating member in FIG.

[0030] Figure 7 for Figure 5 A schematic diagram of the structure of the shell in FIG.

[0031] Figure 8A schematic diagram of the structure of a battery cell provided in some other embodiments of the present application;

[0032] Fig. 9 A schematic diagram of the structure of a battery cell provided in some further embodiments of the present application.

[0033] Icons: 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 part; 52-second insulating part; 10-battery cell; 20-casing; 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

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] The term "plurality" used in the present application refers to two or more (including two).

[0041] 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.

[0042] 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, and the like.

[0043] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0044] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0045] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0046] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0047] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries 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, 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 0.05O2) and its modified compounds, etc.

[0048] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0049] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0050] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0051] 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.

[0052] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0053] 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.

[0054] 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.

[0055] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0056] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0057] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0058] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0059] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0060] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0061] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0062] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0063] 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.

[0064] 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.

[0065] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0066] 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.

[0067] In some embodiments, the electrode assembly is a laminate structure.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0073] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0082] For batteries, they generally include battery cells and external components. The external components can be used to fix and cool the battery cells. For example, the external components can be boxes, support frames, protective plates, water cooling plates, etc. Since the external components may carry high voltage electricity, the battery cells are placed in a high-intensity electric field environment, which affects the reliability and service life of the battery.

[0083] In order to improve the insulation performance of the battery cell, an insulating member can be arranged on the outer surface of the battery cell shell to insulate and protect the battery cell in a high-intensity electric field environment. However, the external member is usually arranged facing a wall of the battery cell shell. In a high-intensity electric field environment, the portion of the insulating member located between the wall and the external member still has the risk of being broken down by the high-intensity electric field and failing, which affects the reliability of the battery cell.

[0084] In view of this, an embodiment of the present application provides a battery cell, which includes an outer shell, a first insulating member and a second insulating member. The outer shell has a first wall, and the first insulating member is covered on the outside of the outer 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 outer shell, and covers at least a portion of the outer surface of the first wall.

[0085] 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.

[0086] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0087] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, 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.

[0088] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0089] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0090] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0091] 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.

[0092] Please refer to Figure 2 , Figure 2 This 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 body 20 . The box body 20 is used to accommodate the battery cell 10 .

[0093] Among them, the box body 20 is a component for accommodating the battery cell 10. The box body 20 provides a storage space for the battery cell 10. The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other to define a storage space for accommodating the battery cell 10. The first part 201 and the second part 202 may be in a variety of shapes, such as a cuboid, a cylinder, etc. The first part 201 may be a hollow structure with one side open, and the second part 202 may also be a hollow structure with one side open, and the open side of the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. It is also possible that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure, and the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. The first part 201 and the second part 202 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0094] In the battery 100, there can be one or more battery cells 10. If there are more than one battery cell 10, the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 can be connected in series, in parallel, or in mixed connection to form a battery 100 module, and the multiple battery 100 modules can be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. It is also possible that all battery cells 10 are directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 10 is accommodated in the box 20.

[0095] In some embodiments, the battery 100 may further include a busbar, through which multiple battery cells 10 may be electrically connected to achieve series connection, parallel connection, or hybrid connection of multiple battery cells 10. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0096] Please refer to Figure 3 , Figure 3 The exploded view of the 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, wherein the electrode assembly 2 is disposed in the housing 1, the electrode terminal 3 is disposed on the housing 1, and the electrode terminal 3 is electrically connected to the electrode assembly 2.

[0097] The housing 1 may include a shell 11 having an opening 11 a and an end cover 12 . The shell 11 has an opening 11 a , and the end cover 12 closes the opening 11 a of the shell 11 .

[0098] The shell 11 is a component for accommodating the electrode assembly 2. The shell 11 may be a hollow structure with an opening 11a formed at one end, or a hollow structure with openings 11a formed at opposite ends. The shell 11 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 11 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0099] 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, the electrolyte and other components. The end cap 12 can be connected to the shell 11 by welding or crimping 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.

[0100] In the embodiment where the housing 11 forms an opening 11a at one end, one end cap 12 may be provided accordingly. In the embodiment where the housing 11 forms openings 11a at two opposite ends, two end caps 12 may be provided accordingly, and 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.

[0101] The electrode terminal 3 is provided on the outer shell 1, and the electrode terminal 3 is used to be electrically connected to the pole tab 21 of the electrode assembly 2 to output the electric energy of the battery cell 10. The electrode terminal 3 can be provided on the shell 11 of the outer shell 1, or on the end cover 12 of the outer shell 1. The electrode terminal 3 and the pole tab 21 can be directly connected, for example, the electrode terminal 3 and the pole tab 21 are welded. The electrode terminal 3 and the pole tab 21 can also be indirectly connected, for example, the electrode terminal 3 and the pole tab 21 are indirectly connected through a current collecting component. The current collecting component can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0102] As an example, Figure 3As shown, along the first direction X, an opening 11a is formed at one end of the shell 11, and the shell 1 has one end cap 12, and one end cap 12 closes the opening 11a of the shell 11. Two electrode terminals 3 are arranged on the end cap 12, and the two electrode terminals 3 are arranged at intervals along the second direction Y. The two electrode terminals 3 are respectively a positive electrode terminal 3 and a negative electrode terminal 3. The two electrode assemblies 2 are arranged along the third direction Z. The ends of the two electrode assemblies 2 facing the end cap 12 are formed with positive and negative tabs, and 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 each other. Among them, the first direction X can be the height direction of the battery cell 10, the second direction Y can be the width direction of the battery cell 10, and the third direction Z can be the thickness direction of the battery cell 10.

[0103] According to some embodiments of the present application, referring to Figure 4 , Figure 4 A schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 1, a first insulating member 4, and a second insulating member 5. The housing 1 has a first wall 13. The first insulating member 4 is wrapped around the outer side of 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 covers at least a portion of the outer surface of the first wall 13.

[0104] In the housing 1, the first wall 13 may be one or more. The end cover 12 of the housing 1 may be the first wall 13, or at least one wall in the shell 11 of the housing 1 may be the first wall 13. Taking the example that the first wall 13 is located in the shell 11 and the shell 11 is in the shape of a rectangular parallelepiped, the first wall 13 may be the wall of the shell 11 in the width direction of the battery cell 10; it may also be the wall of the shell 11 in the thickness direction of the battery cell 10; it may also be the wall of the shell 11 in the height direction of the battery cell 10, and at least one end of the shell 11 in the height direction is formed with an opening 11a. As an example, in Figure 4 In the embodiment, the first wall 13 is a wall of the housing 11 in the height direction of the battery cell 10 .

[0105] The first insulating member 4 is a member that insulates and isolates the outer shell 1 from external members. The first insulating member 4 may 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 may be one or more, and the plurality of first insulating members 4 may 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 may 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 is coated on the shell 11 of the outer shell 1 to cover the outer surface of the shell 11.

[0106] The second insulating member 5 is an insulating component provided between the first insulating member 4 and the housing 1 .

[0107] The material of the first insulating member 4 and the material of the second insulating member 5 may be the same or different.

[0108] The second insulating member 5 may be an insulating coating, an insulating film or the like.

[0109] 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; or 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 the second insulating member 5 may cover a portion of the outer surface of the first wall 13.

[0110] In the above technical solution, the first insulating member 4 is wrapped around the outer side 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 both the second insulating member 5 and the first insulating member 4 can insulate and protect the first wall 13, thereby enhancing the insulation protection effect of the first wall 13. When the first wall 13 is arranged facing the external components, even if the external components are 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.

[0111] In some embodiments, please refer to Figure 4 The second insulating member 5 is an insulating coating disposed on the outer surface of the housing 1 .

[0112] The insulating coating may be disposed on the outer surface of the housing 1 by electrophoresis, spraying, or the like. The insulating coating 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. The insulating coating may cover only the outer surface of the first wall 13, or may cover the outer surfaces of other walls of the housing 1 except the outer surface of the first wall 13.

[0113] Providing an insulating coating as the second insulating member 5 helps the second insulating member 5 to fit tightly to the shell 1, so that the second insulating member 5 is not easy to fall off the shell 1. The insulating coating is used as the second insulating member 5, so that the second insulating member 5 can be more evenly distributed on the outer surface of the shell 1.

[0114] In some embodiments, the material of the insulating coating includes epoxy resin, fluoroplastic or polyimide.

[0115] The material of the insulating coating may be made of one of polyimide, epoxy resin and fluoroplastic as the main component, or may be made of a mixture of multiple of polyimide, epoxy resin and fluoroplastic as the main component.

[0116] In some embodiments, please refer to Figure 5 , Figure 6 and Figure 7 , Figure 5 The exploded view of the battery cell 10 provided in some embodiments of the present application is as follows: Figure 6 for Figure 5 A schematic diagram of the structure of the second insulating member 5, Figure 7 for Figure 5 The outer surface of the first wall 13 is provided with a recess 131 , and the second insulating member 5 covers the recess 131 .

[0117] The number of the recesses 131 may be one or more. The recess 131 may be a groove provided on the outer surface of the first wall 13, for example, the recess 131 is a weight reduction groove, a pressure relief groove, etc. provided on the outer surface of the first wall 13. It may also be a hole provided on the outer surface of the first wall 13, for example, the recess 131 is a liquid injection hole, a pressure relief hole, etc. provided on the outer surface of the first wall 13, wherein the liquid injection hole is used to inject electrolyte into the battery cell 10, and the pressure relief hole is used to install a pressure relief component, and the pressure relief component may be an explosion-proof valve, an explosion-proof plate, a safety valve, etc.

[0118] The second insulating member 5 covers the recess 131 , and 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 .

[0119] In some embodiments, a portion of the second insulating member 5 is located in the recess 131 .

[0120] 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 a portion of the recess 131.

[0121] 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 .

[0122] In some embodiments, Figure 7 As shown, the first wall 13 forms a weak portion 132 in the area where the recess 131 is provided, and the first wall 13 is configured to be able to be broken along the weak portion 132 to release the pressure inside the battery cell 10 .

[0123] It can be understood that the recess 131 is a pressure relief groove. The weak portion 132 is the residual portion after the recess 131 is set on the first wall 13, and the bottom wall of the pressure relief groove can be the weak portion 132. Taking the recess 131 as a pressure relief groove as an example, 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 can be various, for example, the pressure relief groove is a groove extending along an arc trajectory. For example, the pressure relief groove includes multiple groove segments, and the multiple groove segments can form U-shaped, H-shaped, V-shaped, Y-shaped, X-shaped, T-shaped and other structures.

[0124] The recess 131 forms a weak portion 132 which is advantageous for the weak portion 132 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.

[0125] In some embodiments, the second insulating member 5 fills up the recess 131 .

[0126] The protrusion 5 a of the second insulating member 5 fills up the recess 131 .

[0127] The second insulating member 5 fills the recess 131 so as to 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 local discharge in the recess 131 area.

[0128] In some embodiments, please refer to Figure 4 , the entire second insulating member 5 is located between the first wall 13 and the first insulating member 4 .

[0129] It can be understood that the second insulating member 5 has no portion located on other walls of the housing 1 .

[0130] The second insulating member 5 may cover a portion of the outer surface of the first wall 13 , or the second insulating member 5 may cover the entire outer surface of the first wall 13 .

[0131] 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 .

[0132] In some embodiments, please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure 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 .

[0133] 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 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.

[0134] 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.

[0135] In some embodiments, please refer to Figure 8 The housing 1 further comprises a side wall 14, which is arranged around the first wall 13, and 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 comprises a first insulating portion 51 and a second insulating portion 52, the second insulating portion 52 is arranged around 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 is arranged around the side wall 14, and covers at least a part of the outer surface of the side wall 14.

[0136] The side wall 14 may include a plurality of walls. For example, when the housing 1 is in a rectangular parallelepiped shape, 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 a part of the walls may be the end cover 12 and the other part may be the wall in the housing 11. In the embodiment where the first wall 13 is the end cover 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.

[0137] The outer surface of the side wall 14 may be directly connected to the outer surface of the first wall 13 or indirectly connected. Figure 8 In the illustrated embodiment, the outer surface of the side wall 14 is indirectly connected to the outer surface of the first wall 13 via a rounded corner 15 .

[0138] 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, and 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 provided separately or integrally. In the embodiment where the second insulating member 5 is an insulating coating provided 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.

[0139] The second insulating portion 52 is a structure disposed around the side wall 14, and extends from the first insulating portion 51 to a direction close to the wall of the housing 1 opposite to 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 may cover the entire outer surface of the side wall 14.

[0140] As an example, Figure 8 As shown, the thickness direction of the first wall 13 is parallel to the first direction X. Along the first direction X, the housing 1 is in a rectangular parallelepiped shape. 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 along the third direction Z ( Figure 8 not shown) are arranged relative to each other.

[0141] By arranging the first insulating part 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 part 51; by arranging the second insulating part 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 part 52; by surrounding the second insulating part 52 around the first insulating part 51 so that the second insulating part 52 is arranged on the side wall 14 close to the first wall 13, and the first insulating part 51 is connected to one end of the second insulating part 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 outer shell 1 and the position on the side wall 14 of the outer shell 1 close to the first wall 13.

[0142] In some embodiments, please refer to Figure 4 and Figure 8 , the second insulating member 5 covers the entire outer surface of the first wall 13 .

[0143] 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.

[0144] 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 .

[0145] It can be 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, so as to achieve the purpose of 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.

[0146] The electrode assembly 2 is supported by a first wall 13, which 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.

[0147] In some embodiments, please refer to Fig. 9 , Fig. 9 The schematic diagram of the structure of the battery cell 10 provided in some embodiments of the present application. The housing 1 includes a shell 11 and an end cover 12, and the shell 11 has at least one opening 11a. The end cover 12 corresponds to the opening 11a one by one, and the end cover 12 closes the opening 11a. Among them, at least one end cover 12 is a first wall 13.

[0148] 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.

[0149] By covering at least a portion of 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 at least one end cover 12 .

[0150] In some embodiments, the housing 11 has only one opening 11 a .

[0151] As an example, the shell 11 has an opening 11a along the first direction X, and an end cover 12 is covered on 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.

[0152] 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.

[0153] 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 the end cover 12 closes the opening 11 a ; wherein the shell 11 includes a first wall 13 .

[0154] 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.

[0155] By covering the first wall 13 on the shell 11 with the second insulating member 5 , the insulation performance of the first wall 13 on the shell 11 can be improved.

[0156] 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 .

[0157] 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 .

[0158] By setting 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.

[0159] An embodiment of the present application provides a battery 100 , and the battery 100 includes a battery cell 10 provided in any one of the above embodiments.

[0160] An embodiment of the present application provides an electric device, which includes a battery cell 10 provided by any one of the above embodiments, and the battery cell 10 is used to provide electric energy to the electric device.

[0161] Please refer to Figure 8The embodiment of the present application also provides a battery cell 10, which includes a shell 1, a first insulating member 4 and a second insulating member 5, wherein the second insulating member 5 is located between the shell 1 and the first insulating member 4; the bottom wall of the shell 1 is the first wall 13, and the wall of the shell 1 adjacent to the first wall 13 is the side wall 14; the first insulating member 4 covers the first wall 13 and the side wall 14 of the shell 1; the second insulating member 5 includes a first insulating portion 51 and a second insulating portion 52, wherein 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.

[0162] By setting a first insulating part 51 between the first wall 13 and the first insulating member 4, the insulating performance of the first wall 13 can be enhanced. By setting a second insulating part 52 connected to the first insulating part 51 and covering a part of the side, 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 breakdown of the insulating layer at the first wall 13 and improving the reliability of the battery cell 10.

[0163] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0164] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; A first insulating member, covering the outer side of the housing; A second insulating member, at least a portion of which is located between the first wall and the first insulating member and covers at least a portion of an outer surface of the first wall.

2. The battery cell according to claim 1, characterized in that: The second insulating member is an insulating coating disposed on the outer surface of the housing.

3. The battery cell according to claim 1 or 2, characterized in that: The outer surface of the first wall is provided with a recessed portion, and the second insulating member covers the recessed portion.

4. The battery cell according to claim 3, characterized in that: A portion of the second insulating member is located in the recess.

5. The battery cell according to claim 4, characterized in that: The second insulating member fills the recess.

6. The battery cell according to claim 3, characterized in that: The first wall forms a weak portion in a region where the recess is provided, and the first wall is configured to be split along the weak portion to release pressure inside the battery cell.

7. The battery cell according to claim 1 or 2, characterized in that: The entirety of the second insulating member is located between the first wall and the first insulating member.

8. The battery cell according to claim 1 or 2, characterized in that: A portion of the second insulating member is located between the first wall and the first insulating member.

9. The battery cell according to claim 8, characterized in that: The housing further comprises a side wall, the side wall is arranged around the first wall, and the first wall is connected to one end of the side wall along 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 is arranged around the first insulating portion, the first insulating portion is connected to one end of the second insulating portion along the thickness direction of the first wall, the first insulating portion is located between the first wall and the first insulating member, and covers the outer surface of the first wall, the second insulating portion is located between the side wall and the first insulating member, the second insulating portion is arranged around the side wall, and covers at least a portion of the outer surface of the side wall.

10. The battery cell according to claim 1 or 2, characterized in that: The second insulating member covers the entire outer surface of the first wall.

11. The battery cell according to claim 1 or 2, characterized in that: 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 claim 1 or 2, characterized in that: The housing comprises: a housing having at least one opening; An end cover, corresponding to each of the openings, and closing the openings; Wherein, at least one of the end covers is the first wall.

13. The battery cell according to claim 12, characterized in that: The housing has only one opening.

14. The battery cell according to claim 1 or 2, characterized in that: The housing comprises: a housing having at least one opening; An end cover, corresponding to each of the openings, and closing the openings; Wherein, the shell includes the first wall.

15. The battery cell according to claim 14, characterized in that: The shell has only one opening, and a wall of the shell opposite to the end cover is the first wall.

16. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 15.

17. An electrical equipment, characterized in that: The electrical device comprises a battery cell according to any one of claims 1 to 15, and the battery cell is used to provide electrical energy to the electrical device.

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