Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises an electrode assembly, a shell and a heat insulation part, the shell comprises a shell body and an end cover assembly, and the shell body is provided with an accommodating cavity for accommodating the electrode assembly. The shell is provided with an opening, and the end cover assembly comprises an end cover and an insulating sheet. The end cover covers the opening, and the insulating sheet is arranged between the end cover and the electrode assembly. The heat insulation piece is arranged between the insulation sheet and the shell and used for reducing heat exchange between the shell and the insulation sheet, and the melting point T of the heat insulation piece is larger than or equal to 150 DEG C and smaller than or equal to 350 DEG C. According to the technical scheme, the heat transferred to the insulating sheet in the battery monomer can be reduced, and the risk of short circuit and the like of the battery monomer caused by melting of the insulating sheet is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric tools, etc.

[0003] During the operation of the battery, heat is generated, and the heat accumulation causes the temperature to rise, which causes the insulation part in the battery to melt and deform, which can cause short circuit, burning and other hazards of the battery, and the above problems need to be improved. Utility model content

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and an electric equipment, which can reduce the heat transfer to the insulation sheet in the battery monomer, and reduce the risk of short circuit of the battery monomer caused by melting of the insulation sheet.

[0005] In a first aspect, the present application provides a battery monomer, comprising an electrode assembly, a shell and a heat insulation part. The shell comprises a shell body and a cover assembly, and the shell body has a receiving cavity for accommodating the electrode assembly. The shell body is provided with an opening, and the cover assembly comprises a cover and an insulation sheet. The cover covers the opening, and the insulation sheet is arranged between the cover and the electrode assembly. The heat insulation part is arranged between the insulation sheet and the shell, and the heat insulation part is used to reduce the heat exchange between the shell and the insulation sheet, and the melting point T of the heat insulation part is: 150℃≤T≤350℃.

[0006] In the technical scheme of the present application, the electrode assembly in the battery monomer is the main component for converting chemical energy and electrical energy, and the operation of the electrode assembly realizes the charging and discharging of the battery monomer. The shell provides a stable environment for the electrode assembly, reduces the influence of impurities and moisture in the shell on the electrode assembly. The shell is divided into a cover assembly and a shell body, which facilitates the installation and sealing of the electrode assembly. In the cover assembly, the insulation sheet insulates the cover and the electrode assembly, reduces the risk of short circuit and electric leakage of the shell, and improves the stability of the battery monomer in operation. The heat insulation part is provided, and the melting point of the heat insulation part is relatively high, so that it will not melt and deform due to local overheating. Further, the heat insulation part can reduce the heat exchange between the insulation sheet and the shell, reduce the heat released by the electrode assembly during operation from being transferred to the insulation sheet through the shell, and reduce the risk of melting and deformation of the insulation sheet due to local overheating.

[0007] In some embodiments, the heat insulation part is arranged between the cover and the insulation sheet. In the above structure, the heat insulation part can reduce the heat transfer between the cover and the insulation sheet, reduce the heat transfer from the cover to the insulation sheet, and improve the structural stability of the insulation sheet, thereby improving the stability of the battery monomer in operation.

[0008] In some embodiments, the insulation sheet is arranged on the end cover along the first direction, and the thermal insulation piece has a dimension H1 along the first direction, where 10 < H1 < 30 μm. In the above structure, by setting the thickness of the thermal insulation piece to a reasonable range, the space occupied by the thermal insulation piece can be reduced on the basis of improving the thermal insulation effect, thereby improving the energy density of the battery monomer.

[0009] In some embodiments, the insulation sheet is arranged on the end cover along the first direction, and the thermal insulation piece has a dimension H1 along the first direction, where 10 < H1 < 30 μm. In the above structure, by setting the thickness of the thermal insulation piece to a reasonable range, the space occupied by the thermal insulation piece can be reduced on the basis of improving the thermal insulation effect, thereby improving the energy density of the battery monomer.

[0010] In some embodiments, the thermal insulation piece comprises at least one of a polypropylene thermal insulation sheet, a polyethylene terephthalate thermal insulation sheet, a polyimide thermal insulation sheet, or a perfluoroalkoxy resin thermal insulation sheet. The above thermal insulation sheet can effectively reduce heat transfer while the structure thereof is not deformed or melted, and is easy to manufacture and assemble.

[0011] In some embodiments, the thermal insulation piece is arranged between the insulation sheet and the shell. In the above structure, the thermal insulation piece can reduce heat transfer between the shell and the insulation sheet, reduce heat transfer from the shell to the insulation sheet, and improve the structural stability of the insulation sheet, thereby improving the stability of the battery monomer in operation.

[0012] In some embodiments, the thermal insulation piece is arranged around the periphery of the insulation sheet. In the above structure, the area of the thermal insulation piece is increased, thereby improving the thermal insulation effect of the insulation sheet.

[0013] In some embodiments, the thermal insulation piece is connected to the side surface of the shell facing the insulation sheet. In the above structure, the thermal insulation piece is connected to the shell, thereby reducing the risk of movement of the thermal insulation piece and improving the thermal insulation effect.

[0014] In some embodiments, the battery monomer further comprises an insulation film wrapped around the outer periphery of the electrode assembly, the thermal insulation piece is connected to the insulation film, and the thermal insulation piece is arranged between the insulation film and the end cover. In the above structure, by arranging the insulation film, the insulation performance of the battery monomer is improved, and by arranging the thermal insulation piece on the insulation film, the structural stability and assembly efficiency of the thermal insulation piece are improved.

[0015] In some embodiments, the insulation sheet is arranged on the end cover along the first direction, and the thermal insulation piece protrudes from the surface of the insulation sheet facing the end cover along the first direction. In the above structure, by arranging the thermal insulation piece to protrude from the surface of the insulation sheet, the thermal insulation effect is improved, and the risk of heat transfer to the insulation sheet is reduced.

[0016] In some embodiments, the size H2 of the thermal insulation member along the first direction is 3.5mm≤H2≤6mm. In the above structure, by setting the height of the thermal insulation member within a reasonable range, the space occupied by the thermal insulation member can be reduced on the basis of improving the thermal insulation effect, and the energy density of the battery monomer is improved.

[0017] In some embodiments, the size H3 of the thermal insulation member along the second direction is 20pm≤H3≤60pm, and the second direction is perpendicular to the first direction. In the above structure, by setting the thickness of the thermal insulation member within a reasonable range, the space occupied by the thermal insulation member can be reduced on the basis of improving the thermal insulation effect, and the energy density of the battery monomer is improved.

[0018] In some embodiments, the thermal insulation member includes any one of a polypropylene thermal insulation ring, a polyethylene terephthalate thermal insulation ring, a polyimide thermal insulation ring, or a perfluoroalkoxy resin thermal insulation ring. The above thermal insulation ring can effectively reduce heat transfer while the structure of the thermal insulation ring itself does not deform and melt, and is easy to manufacture and has high assembly convenience.

[0019] In a second aspect, the present application provides a battery device including the battery monomer in the above embodiments.

[0020] In a third aspect, the present application provides a power consuming device including the battery device in the above embodiments, and the battery device is used to provide electric energy.

[0021] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0023] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0024] Figure 2 The exploded schematic diagram of a battery device is provided for some embodiments of the present application;

[0025] Figure 3 The exploded structural schematic diagram of a battery monomer is provided for some embodiments of the present application;

[0026] Figure 4 The partial structural schematic diagram of a battery monomer is provided for some embodiments of the present application;

[0027] Figure 5A partial structural schematic view of a battery cell provided for another embodiment of the present application;

[0028] Figure 6 A partial structural schematic view of a battery cell provided for another embodiment of the present application;

[0029] Figure 7 A cross-sectional structural schematic view of a battery cell provided for another embodiment of the present application;

[0030] Figure 8 Provided for another embodiment of the present application is a battery cell. Figure 7 An enlarged structural schematic view of part A.

[0031] Detailed description of reference signs

[0032] 1 vehicle; 2 battery device; 3 controller; 4 motor; 5 case; 5a first case portion; 5b second case portion; 6 battery cell; 10 electrode assembly; 20 housing; 30 end cap; 40 housing; 50 electrode terminal; 60 pressure relief mechanism; 70 insulating sheet; 80 insulating film; 7 thermal insulating member; X first direction; Y second direction. DETAILED DESCRIPTION

[0033] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", etc. 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. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0036] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0037] In the description of the embodiments of the present application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character“ / ” in this paper generally means that the front and rear associated objects are a“or” relationship.

[0038] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise expressly specified and limited, the technical terms“mounting”,“connecting”,“connecting”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] The term“and / or” in this application only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character“ / ” in this paper generally means that the front and rear associated objects are a“or” relationship.

[0042] In the embodiments of the present application, the same reference signs 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 and should not constitute any limitation on the present application.

[0043] In the embodiments of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximately parallel as generally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular as generally recognized in engineering. Exemplarily, the included angle between two directions is 85°-95°, which can be considered as the two directions being perpendicular; the included angle between two directions is 0°-5°, which can be considered as the two directions being parallel.

[0044] "Multiple" appearing in the present application refers to two or more (including two).

[0045] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

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

[0047] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive electrode and the negative electrode from short-circuiting, and at the same time, the active ions can pass through.

[0048] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0049] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0050] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0051] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), 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 (which can also be referred to as NCM 333 ), LiNi 0. o 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0. o 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05O2) and modified compounds thereof, and the like. The modified compounds refer to substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

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

[0053] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0054] As an example, the negative electrode sheet can 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 opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0056] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0057] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, and the like. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative electrode active material, or can be provided with a negative electrode active material.

[0058] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0059] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

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

[0061] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous separator film having good chemical stability and mechanical stability can be used.

[0062] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0063] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0064] In some embodiments, the battery cell further comprises an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0065] The liquid electrolyte includes an electrolyte salt and a solvent.

[0066] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium bisoxalate borate, lithium difluorophosphoric acid dioxalate, and lithium tetrafluorophosphoric acid oxalate.

[0067] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0068] In some embodiments, the electrolyte can also optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0069] The gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0070] The solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0071] As an example, the polymer of the polymer solid electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0072] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0073] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0074] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0075] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0076] In some embodiments, the electrode assembly is a stacked structure.

[0077] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0078] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0079] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0080] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0081] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0082] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0083] In some embodiments, the electrode assembly can be provided with tabs, which can guide the current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0084] In some embodiments, the battery cell can include a housing. The housing can 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, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate the electrode assembly and the electrolyte, etc.

[0085] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), etc., without specific limitation.

[0086] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided on the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0087] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tabs. The electrode terminal can be directly connected to the tabs or indirectly connected to the tabs through a current collecting member. The electrode terminal can be provided on the end cap or on the shell.

[0088] The battery cell includes a housing, an insulating member, a pressure relief mechanism, and an electrode assembly. The insulating member and the electrode assembly are disposed in the housing, and the insulating member is used to insulate the electrode assembly from the shell. The electrode assembly generates heat during operation, which can cause the insulating member to deform and fail.

[0089] In view of this, the application provides a battery monomer. The electrode assembly in the battery monomer is the main component for conversion between chemical energy and electrical energy. The operation of the electrode assembly realizes the charging and discharging of the battery monomer. The shell provides a stable environment for the electrode assembly, and reduces the influence of impurities and moisture in the shell on the electrode assembly. The shell is divided into an end cover assembly and a shell body, facilitating the installation and sealing of the electrode assembly. In the end cover assembly, the insulating sheet insulates the end cover and the electrode assembly, reducing the risk of short circuit and electric leakage of the shell, and improving the stability of the battery monomer in operation. The heat insulation piece is provided, and the heat insulation piece has a relatively high melting point and will not melt and deform due to local overheating. Further, the heat insulation piece can reduce heat exchange between the insulating sheet and the shell, reduce the heat released by the electrode assembly during operation from being transmitted to the insulating sheet through the shell, and reduce the risk of melting and deformation of the insulating sheet due to local overheating, thereby improving the stability of the battery monomer in operation.

[0090] The battery device mentioned in the embodiments of the application can include one or more battery monomer assemblies for providing voltage and capacity. The battery monomer assembly can include a plurality of battery monomers connected in series, in parallel, or in a mixed connection through a busbar component.

[0091] In some embodiments, the battery monomer assembly is usually formed by arranging a plurality of battery monomers.

[0092] As an example, the battery monomer assembly can be a battery module formed by arranging and fixing a plurality of battery monomers into an independent module. As an example, the battery module can be formed by bundling a plurality of battery monomers with a cable tie.

[0093] In some embodiments, the battery device can be a battery pack including a box body and one or more battery monomer assemblies accommodated in the box body.

[0094] As an example, the battery monomer assembly can be a battery module, and the battery monomer assembly can be accommodated in the box body by fixing the battery module in the box body.

[0095] As an example, the battery monomer assembly can also be accommodated in the box body by directly fixing a plurality of battery monomers in the box body.

[0096] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery monomer assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0097] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, so that a closed space is formed inside the box body to accommodate the battery monomer assembly.

[0098] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and longitudinal beam of the vehicle.

[0099] The technical solutions described in the embodiments of the present application are applicable to various battery cell using electric devices, such as mobile phones, portable devices, notebook computers, electric cars, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0100] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0101] The following embodiments take the vehicle as an example for convenience of description.

[0102] Figure 1 The structural schematic diagram of the vehicle provided in some embodiments of the present application is shown.

[0103] As shown in FIG. 1, the inside of the vehicle 1 is provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the operating power supply of the vehicle 1.

[0104] The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the working power demand of the vehicle 1 during starting, navigation and driving.

[0105] In some embodiments of the present application, the battery device 2 can not only be used as the operating power supply of the vehicle 1, but also be used as the driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0106] Figure 2 The explosion schematic diagram of the battery provided in some embodiments of the present application is shown. Figure 2As shown, the battery device 2 includes a box 5 and battery cells 6 accommodated in the box 5. The battery cells 6 can be the smallest unit constituting a battery.

[0107] The box 5 is used to accommodate the battery cells 6, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box part 5a and a second box part 5b, the first box part 5a and the second box part 5b are mutually coverable, and the first box part 5a and the second box part 5b together define an accommodation space for accommodating the battery cells 6. The second box part 5b can be a hollow structure with one end open, and the first box part 5a is a plate-like structure, which covers the open side of the second box part 5b to form the box 5 with the accommodation space; both the first box part 5a and the second box part 5b can also be a hollow structure with one side open, and the open side of the first box part 5a covers the open side of the second box part 5b to form the box 5 with the accommodation space. Of course, the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0108] To improve the sealing performance of the first box part 5a and the second box part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box part 5a and the second box part 5b.

[0109] Suppose the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called an upper box cover, and the second box part 5b can also be called a lower box.

[0110] In the battery device 2, the battery cells 6 can be one or multiple. If the battery cells 6 are multiple, the multiple battery cells 6 can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells 6 are connected in series and in parallel.

[0111] The multiple battery cells 6 can be directly connected in series, in parallel or in a mixed manner, and the whole formed by the multiple battery cells 6 is accommodated in the box 5; of course, the multiple battery cells 6 can first be connected in series, in parallel or in a mixed manner to form a battery module, and multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box 5.

[0112] Please refer to Figures 3 to 4 , Figure 3 The exploded structural schematic diagram of the battery cell 6 provided for some embodiments of the present application, Figure 4 The partial structural schematic diagram of the battery cell 6 provided for some embodiments of the present application.

[0113] As shown in the figure, the battery cell 6 provided by the embodiment of the present application comprises an electrode assembly 10, an outer shell 20, and a thermal insulation piece 7. The outer shell 20 comprises a shell body 40 and an end cover 30 assembly, the shell body 40 has a receiving cavity for accommodating the electrode assembly 10. The shell body 40 is provided with an opening, and the end cover 30 assembly comprises the end cover 30 and an insulating sheet 70. The end cover 30 covers the opening, and the insulating sheet 70 is arranged between the end cover 30 and the electrode assembly 10. The thermal insulation piece 7 is arranged between the insulating sheet 70 and the outer shell 20, the thermal insulation piece 7 is used to reduce the heat exchange between the outer shell 20 and the insulating sheet 70, and the melting point T of the thermal insulation piece 7 is: 150℃≤T≤350℃.

[0114] The melting point of the thermal insulation piece 7 itself is relatively high, which can still maintain its structure and shape during the operation of the battery cell 6 or when thermal runaway occurs, thereby ensuring the thermal insulation effect. In addition, the thermal insulation piece 7 itself has a relatively low thermal conductivity to block the heat transfer. For example, aerogel, polyethylene, polyimide, silicone rubber, and glass fiber can be used to manufacture the thermal insulation piece 7.

[0115] In the technical solution of the embodiment of the present application, the electrode assembly 10 in the battery cell 6 is the main component for converting chemical energy and electrical energy, and the operation of the electrode assembly 10 realizes the charging and discharging of the battery cell 6. The outer shell 20 provides a stable environment for the electrode assembly 10, and reduces the influence of impurities and moisture in the outer shell 20 on the electrode assembly 10. The outer shell 20 is divided into the end cover 30 assembly and the shell body 40, which facilitates the installation and sealing of the electrode assembly 10. In the end cover 30 assembly, the insulating sheet 70 insulates the end cover 30 and the electrode assembly 10, which reduces the risk of short circuit and electric leakage of the outer shell 20 and improves the operation stability of the battery cell 6. The thermal insulation piece 7 is arranged, the thermal insulation piece 7 itself has a relatively high melting point and will not be deformed due to local overheating. Further, the thermal insulation piece 7 can reduce the heat exchange between the insulating sheet 70 and the outer shell 20, reduce the heat released by the electrode assembly 10 during operation from being transferred to the insulating sheet 70 through the outer shell 20, and reduce the risk of melting and deformation of the insulating sheet 70 due to local overheating, thereby improving the stability of the operation of the battery cell 6.

[0116] In some embodiments of the present application, the thermal insulation piece 7 is arranged between the end cover 30 and the insulating sheet 70. In the above structure, the thermal insulation piece 7 can reduce the heat transfer between the end cover 30 and the insulating sheet 70, reduce the heat transfer from the end cover 30 to the insulating sheet 70, and improve the structural stability of the insulating sheet 70, thereby improving the stability of the operation of the battery cell 6.

[0117] In some embodiments of the present application, the orthographic projection of the insulating sheet 70 on the end cover 30 falls within the orthographic projection range of the thermal insulation piece 7 on the end cover 30.

[0118] The end cover 30 is provided with a pressure relief mechanism 60. When the pressure relief mechanism 60 is relieved, the electrode assembly 10 will move and hit the insulating sheet 70. The sharp position on the insulating sheet 70 will cause the electrode assembly 10 to short circuit, thereby causing the premature failure of the battery monomer 6. In the above structure, the area of the heat insulation piece 7 is greater than or equal to the area of the insulating sheet 70. When the insulating sheet 70 fails and the heat insulation piece 7 covers the insulating sheet 70, the heat transfer of the short-circuited insulating sheet 70 to the end cover 30 is reduced, and the heat insulation effect can be further improved. Alternatively, the heat insulation piece 7 can also insulate the end cover 30, reducing the risk of short circuit of the shell 20 caused by direct contact of the electrode assembly 10 with the end cover 30.

[0119] In some embodiments of the present application, the insulating sheet 70 is arranged along the first direction X with the end cover 30, and the size H1 of the heat insulation piece 7 along the first direction X is: 10 μm≤H1≤30 μm. In the above structure, by controlling the thickness of the heat insulation piece 7 within a reasonable range, the space occupied by the heat insulation piece 7 can be reduced on the basis of improving the heat insulation effect, and the energy density of the battery monomer 6 can be improved.

[0120] In some embodiments of the present application, the heat insulation piece 7 includes at least one of a polypropylene heat insulation sheet, a polyethylene terephthalate heat insulation sheet, a polyimide heat insulation sheet, or a perfluoroalkoxy resin heat insulation sheet.

[0121] Polypropylene is a high molecular material with good heat insulation performance, which can effectively isolate external heat energy and achieve the effect of heat preservation, heat insulation and insulation. Polypropylene material does not contain toxic and harmful substances, and will not harm the environment and human body during production, use and disposal. Polypropylene material is very light and thin, and thin polypropylene can achieve high heat insulation effect, and has good wear resistance and corrosion resistance, which can effectively improve the energy density of the battery monomer 6.

[0122] The polyethylene terephthalate heat insulation sheet has high heat resistance, and can withstand a temperature of 120°C for a long time and a higher temperature for a short time. The PET material has good impact strength, folding resistance and dimensional stability. The polyethylene terephthalate heat insulation sheet shows good resistance to a variety of chemicals, such as oil, fat, dilute acid, dilute alkali and most solvents.

[0123] The polyimide film has extremely high thermal stability, can maintain its physical and chemical properties stable at high temperature environment, and can withstand high temperature for a long time, up to 250-350°C. The polyimide thermal insulation sheet has low thermal conductivity and good thermal insulation performance, which is 3-4 times of traditional thermal insulation materials. At the same time, the polyimide film has excellent electrical insulation performance, and when the insulation sheet 70 melts and fails, the thermal insulation part 7 can effectively insulate and reduce the risk of short circuit between the electrode assembly and the shell. The polyimide has good resistance to a variety of chemical solvents and weak acids. The polyimide film has high strength, high modulus and good toughness, and can withstand large mechanical stress.

[0124] The perfluoroalkoxy resin thermal insulation sheet can maintain its physical and chemical properties stable in the temperature range of -200-260°C, and is suitable for extreme temperature environment. The perfluoroalkoxy resin thermal insulation sheet can withstand almost all strong acids, strong bases and strong oxidizing chemicals, and has extremely strong chemical inertness. The perfluoroalkoxy resin thermal insulation sheet has excellent electrical insulation, which can effectively block current leakage. The perfluoroalkoxy resin thermal insulation sheet can be processed into various shapes and sizes by injection molding, extrusion and other methods.

[0125] The above-mentioned thermal insulation sheet can effectively reduce heat transfer while the structure of the thermal insulation sheet itself does not deform and melt, and is easy to manufacture and has high assembly convenience. Moreover, the above-mentioned structure is an insulation structure, which can still insulate the end cover 30 and the electrode assembly 10 when the insulation sheet 70 deforms, thereby improving the operation stability of the battery monomer 6.

[0126] As shown in Figure 5 In some embodiments of the present application, the thermal insulation part 7 is arranged between the insulation sheet 70 and the shell 40. In the battery device 2, a plurality of battery monomers 6 are arranged in layers, and the gap between adjacent battery monomers 6 is small. When one of the battery monomers 6 in the battery device 2 undergoes thermal runaway, the insulation sheet 70 in the adjacent battery monomer 6 will soften due to heat.

[0127] The above-mentioned structure can reduce the heat transfer between the shell 40 and the insulation sheet 70, reduce the heat transfer from the shell 40 to the insulation sheet 70, and improve the structural stability of the insulation sheet 70, thereby improving the operation stability of the battery monomer 6.

[0128] As shown in Figure 6 In some embodiments of the present application, the thermal insulation part 7 is arranged around the circumference of the insulation sheet 70. The above-mentioned structure increases the area of the thermal insulation part 7 and improves the thermal insulation effect of the insulation sheet 70.

[0129] As shown in Figure 3 and Figure 5As shown, in some embodiments of this application, the heat insulation member 7 is connected to the surface of the housing 40 facing the insulating sheet 70. This structure, by connecting the heat insulation member 7 to the housing 40, reduces the risk of movement of the heat insulation member 7 and improves the heat insulation effect.

[0130] like Figure 5 As shown, in some embodiments of this application, the battery cell 6 further includes an insulating film 80, which wraps around the outer periphery of the electrode assembly 10. A heat insulation member 7 is connected to one end of the insulating film 80 facing the end cap 30, and the heat insulation member 7 is disposed between the insulating film 80 and the end cap 30.

[0131] For example, the insulating film 80 is a Mylar film, which is used to wrap the electrode assembly 10, keeping the wound body insulated from the outer casing 20 and preventing short circuits inside the battery cell 6. The main component of the Mylar film is polyester film (PET). It is a high-performance insulating material with insulating properties, high temperature resistance, and corrosion resistance.

[0132] The heat insulation component 7 can be connected to the insulating film 80 by means of bonding, heat fusion, or other methods. In the above structure, by setting the insulating film 80, the insulation performance of the battery cell 6 is improved, and placing the heat insulation component 7 on the insulating film 80 improves the structural stability and assembly efficiency of the heat insulation component 7.

[0133] like Figure 7 as well as Figure 8 As shown, in some embodiments of this application, the insulating sheet 70 and the end cap 30 are disposed along a first direction X, and the heat insulation member 7 protrudes from the surface of the insulating sheet 70 facing the end cap 30 in the first direction X. Exemplarily, the first direction X is the thickness direction of the insulating sheet 70.

[0134] In the above structure, the heat insulation element 7 is provided to protrude from the surface of the insulating sheet 70, which improves the heat insulation effect and reduces the risk of heat transfer to the insulating sheet 70.

[0135] In some embodiments of this application, the dimension H2 of the heat insulation member 7 along the first direction X is: 3.5mm ≤ H2 ≤ 6 mm. In the above structure, by setting the height of the heat insulation member 7 within a reasonable range, it is possible to improve the heat insulation effect while reducing the space occupied by the heat insulation member 7, thereby increasing the energy density of the battery cell 6.

[0136] like Figure 6 As shown, in some embodiments of this application, the dimension H3 of the heat insulation member 7 along the second direction Y is: 20μm≤H3≤60μm, and the second direction Y is perpendicular to the first direction X. Optionally, the second direction Y is the thickness direction of the battery cell 6.

[0137] In the above structure, by setting the thickness of the thermal insulation member 7 within a reasonable range, the thermal insulation effect can be improved, and the space occupied by the thermal insulation member 7 can be reduced, thereby improving the energy density of the battery cell 6.

[0138] In some embodiments of the present application, the thermal insulation member 7 includes any one of a polypropylene thermal insulation ring, a polyethylene terephthalate thermal insulation ring, a polyimide thermal insulation ring, or a perfluoroalkoxy resin thermal insulation ring. The above thermal insulation ring can effectively reduce heat transfer while the structure of the thermal insulation ring itself does not deform or melt, and is easy to manufacture and has high assembly convenience.

[0139] In some alternative embodiments, the battery cell 6 includes an electrode assembly 10, a housing 20, and a thermal insulation member 7. The housing 20 includes a shell 40 and an end cover 30 assembly, the shell 40 has a receiving cavity for accommodating the electrode assembly 10. The shell 40 is provided with an opening, and the end cover 30 assembly includes the end cover 30 and an insulating sheet 70. The end cover 30 covers the opening, and the insulating sheet 70 is arranged between the end cover 30 and the electrode assembly 10. The thermal insulation member 7 is arranged between the end cover 30 and the insulating sheet 70, the thermal insulation member 7 is used to reduce heat exchange between the housing 20 and the insulating sheet 70, and the melting point T of the thermal insulation member 7 is: 150℃≤T≤350℃. The orthographic projection of the insulating sheet 70 on the end cover 30 falls within the orthographic projection range of the thermal insulation member 7 on the end cover 30.

[0140] In some alternative embodiments, the battery cell 6 includes an electrode assembly 10, a housing 20, and a thermal insulation member 7. The housing 20 includes a shell 40 and an end cover 30 assembly, the shell 40 has a receiving cavity for accommodating the electrode assembly 10. The shell 40 is provided with an opening, and the end cover 30 assembly includes the end cover 30 and an insulating sheet 70. The end cover 30 covers the opening, and the insulating sheet 70 is arranged between the end cover 30 and the electrode assembly 10. The thermal insulation member 7 is arranged between the insulating sheet 70 and the shell 40, and the thermal insulation member 7 is arranged around the circumference of the insulating sheet 70. The thermal insulation member 7 is used to reduce heat exchange between the housing 20 and the insulating sheet 70, and the melting point T of the thermal insulation member 7 is: 150℃≤T≤350℃.

[0141] The embodiments of the present application provide a battery device 2 comprising the battery cell 6 in the above embodiments. The embodiments of the present application also provide an electrical equipment comprising the battery device 2 in the above embodiments, and the battery device 2 is used to provide electrical energy. In the above battery device 2 and electrical equipment, the battery cell 6 in the above embodiments is included, the electrode assembly 10 in the battery cell 6 is the main component for converting chemical energy and electrical energy, and the operation of the electrode assembly 10 realizes the charging and discharging of the battery cell 6. The shell 20 provides a stable environment for the electrode assembly 10, and reduces the influence of impurities and moisture in the shell 20 on the electrode assembly 10. The shell 20 is divided into the end cover 30 assembly and the shell body 40, which facilitates the installation and sealing of the electrode assembly 10. In the end cover 30 assembly, the insulating sheet 70 insulates the end cover 30 and the electrode assembly 10, reduces the risk of short circuit and electric leakage of the shell 20, and improves the operation stability of the battery cell 6. The heat insulation piece 7 is arranged, the heat insulation piece 7 itself has a high melting point and will not melt and deform due to local overheating. Further, the heat insulation piece 7 can reduce the heat exchange between the insulating sheet 70 and the shell 20, reduce the heat released by the electrode assembly 10 during operation from being transmitted to the insulating sheet 70 through the shell 20, and reduce the risk of melting and deformation of the insulating sheet 70 due to local overheating.

[0142] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted for the components therein, and in particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: an electrode assembly; a shell comprising a shell body and an end cover assembly, the shell body having a receiving cavity for accommodating the electrode assembly, the shell body being provided with an opening, the end cover assembly comprising an end cover and an insulating sheet, the end cover covering the opening, the insulating sheet being arranged between the end cover and the electrode assembly; a thermal insulation member arranged between the insulating sheet and the shell body, the thermal insulation member being used to reduce heat exchange between the shell body and the insulating sheet, and the thermal insulation member having a melting point T of 150℃≤T≤350℃.

2. The battery cell of claim 1, wherein, The thermal insulation member is arranged between the end cover and the insulating sheet.

3. The battery cell of claim 2, wherein, A normal projection of the insulating sheet on the end cover falls within a range of a normal projection of the thermal insulation member on the end cover.

4. The battery cell according to claim 2 or 3, characterized in that, The insulating sheet and the end cover are arranged along a first direction, and a dimension H1 of the thermal insulation member along the first direction is 10μm≤H1≤30μm.

5. The battery cell of claim 4, wherein, The thermal insulation member comprises at least one of a polypropylene thermal insulation sheet, a polyethylene terephthalate thermal insulation sheet, a polyimide thermal insulation sheet, or a perfluoroalkoxy resin thermal insulation sheet.

6. The battery cell of claim 1, wherein, The thermal insulation member is arranged between the insulating sheet and the shell body.

7. The battery cell of claim 6, wherein, The thermal insulation member is arranged along a circumferential direction of the insulating sheet.

8. The battery cell of claim 7, wherein, The thermal insulation member is connected to a side surface of the shell body facing the insulating sheet.

9. The battery cell of claim 7, wherein, The battery monomer further comprises an insulating film wrapped around an outer periphery of the electrode assembly, the thermal insulation member being connected to the insulating film, and the thermal insulation member being arranged between the insulating film and the end cover.

10. The battery cell of any one of claims 6-9, wherein, The insulating sheet and the end cover are arranged along a first direction, and the thermal insulation member protrudes along the first direction from a surface of the insulating sheet facing the end cover.

11. The battery cell of claim 10, wherein, A dimension H2 of the thermal insulation member along the first direction is 3.5mm≤H2≤6 mm.

12. The battery cell of claim 11, wherein, A dimension H3 of the thermal insulation member along a second direction is 20μm≤H3≤60μm, the second direction being perpendicular to the first direction.

13. The battery cell of claim 10, wherein, The thermal insulation member comprises any one of a polypropylene thermal insulation ring, a polyethylene terephthalate thermal insulation ring, a polyimide thermal insulation ring, or a perfluoroalkoxy resin thermal insulation ring.

14. A battery device characterized by comprising: The battery device comprises the battery monomer as claimed in any one of claims 1-13.

15. An electrical device, characterized by The electrical equipment comprises the battery device as claimed in claim 14, the battery device being used to provide electrical energy.

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