CN221057480U

CN221057480U - Battery monomer, battery and electric equipment

Info

Publication number: CN221057480U
Application number: CN202420516633.7U
Authority: CN
Inventors: 柯海波; 郑于炼; 金海族; 黄守君; 李全坤; 陈燕琳
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Filing date: 2024-03-18
Publication date: 2024-05-31
Anticipated expiration: 2034-03-18

Abstract

The application provides a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The battery cell includes: a housing; the battery cell group comprises at least one electrode assembly, and the battery cell group is accommodated in the shell; the first insulating piece is coated on the outer side of the battery cell group and is configured to insulate and isolate the electrode assembly from the shell; wherein the first insulating member comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, lambda is less than 0.26; the shell comprises a shell and an end cover, wherein the shell is provided with an opening, the end cover seals the opening, and the shell is provided with a first wall part which is opposite to the opening; the battery cell also includes a second insulator disposed between the first wall and the cell stack, the first insulator disposed between the second insulator and the cell stack, the second insulator configured to insulate the first wall from the cell stack.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

In the current lithium battery system, when thermal runaway occurs in the battery, the temperature and the air pressure of the battery are rapidly increased, the battery core can transfer the temperature to the outer shell, and then the battery is transferred to the adjacent battery, so that the condition of thermal diffusion of the adjacent battery can be caused, the dangerous conditions such as fire and explosion are easily caused, the safety of the battery is lower, and the current use requirement cannot be met.

Disclosure of utility model

Therefore, an objective of the embodiments of the present application is to provide a battery unit, a battery and an electric device, so as to solve the problem of low battery safety in the prior art.

In order to solve the above problems, in a first aspect, an embodiment of the present application provides a battery cell including:

a housing;

A battery cell stack including at least one electrode assembly, the battery cell stack being housed within the housing;

A first insulating member coated on an outer side of the battery cell group, the first insulating member configured to insulate the electrode assembly from the case;

Wherein the first insulating piece comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, lambda is less than 0.26;

The housing comprises a shell and an end cover, wherein the shell is provided with an opening, the end cover is used for closing the opening, and the shell is provided with a first wall part which is arranged opposite to the opening; the battery cell also comprises a second insulating piece, wherein the second insulating piece is arranged between the first wall part and the battery cell group, the first insulating piece is arranged between the second insulating piece and the battery cell group, and the second insulating piece is configured to insulate and isolate the first wall part from the battery cell group.

In the implementation process, the first insulating piece with the heat-resistant layer is coated on the outer side of the battery cell group, so that the first insulating piece can be used as a temperature isolation component between the battery cell group and the shell, and the heat-resistant layer has higher melting point and/or lower heat conductivity coefficient, so that the first insulating piece has high temperature resistance and/or high heat insulation performance, and the temperature transmission between the battery cell group and the shell can be effectively reduced. The housing may include a shell having an opening and an end cap closing the opening to accommodate the battery cell stack and the first insulator. And a second insulating piece can be arranged between the first wall part corresponding to the opening of the shell and the battery cell group, so that the battery cell group is fixed during packaging, and insulating treatment is performed on the first wall part, so that the packaging efficiency is improved. When the temperature and the air pressure of the electrode assembly in the battery are increased, the first insulating piece with high temperature resistance and/or high heat insulation performance can not be melted by the high temperature generated by the electrode assembly, isolate the high temperature generated by the electrode assembly, reduce the adverse condition that the high temperature on the electrode assembly is transferred to the shell, further reduce the temperature transfer between the shell and the adjacent battery, further reduce the dangerous conditions such as fire and explosion caused by the heat diffusion of the adjacent battery, effectively improve the safety and the stability of the battery, and be applicable to electric equipment for various applications.

In some embodiments, the first insulator further comprises an insulator body having a melting point lower than the melting point of the heat resistant layer and/or a thermal conductivity lower than the thermal conductivity of the insulator body; the heat-resistant layer is provided on the outer surface or the inner surface of the insulating body. The corresponding heat-resistant layer is arranged on the outer surface or the inner surface of the original insulating body, so that the first insulating piece with high temperature resistance and/or high heat insulation performance is obtained, the manufacturing cost of the first insulating piece can be reduced, the contact time of the battery cell group and the shell can be effectively delayed, and the heat diffusion between the battery cell group and the shell can be reduced.

In some embodiments, the thickness of the heat-resistant layer is D ₁,1μm≤D₁≤300μm.D₁ is more than or equal to 1 mu m, so that the heat-resistant layer has effective material thickness, and the condition that the temperature isolation effect is poor due to too thin material is reduced; d ₁ is less than or equal to 300 mu m, so that the normal assembly and encapsulation of the battery cannot be influenced by the thickness of the heat-resistant layer, and the functionality and applicability of the heat-resistant layer are considered by reasonably designing the thickness of the heat-resistant layer.

In some embodiments, the first insulator further comprises an insulator body having a melting point lower than the melting point of the heat resistant layer and/or a thermal conductivity lower than the thermal conductivity of the insulator body; the heat-resistant layer is arranged on the inner surface and the outer surface of the insulating body. The corresponding heat-resistant layers are arranged on the outer surface and the inner surface of the original insulating body, so that the first insulating piece with high temperature resistance and/or high heat insulation performance is obtained, the temperature isolation effect of the first insulating piece can be further improved, the contact time of the battery cell group and the shell is effectively delayed, and the heat diffusion between the battery cell group and the shell is reduced.

In some embodiments, the thickness of the heat-resistant layer arranged on the inner surface of the insulating body is D ₂, and the thickness of the heat-resistant layer arranged on the outer surface of the insulating body is D ₃,1μm≤D₂+D₃≤300μm.D₂+D₃ not less than 1 μm, so that the total thickness of the heat-resistant layers on two sides of the insulating body has an effective material thickness, and the situation that the temperature isolation effect is poor due to too thin material is reduced; and D ₂+D₃ is less than or equal to 300 mu m, so that the total thickness of the heat-resistant layers on two sides of the insulating body cannot influence the normal assembly and encapsulation of the battery due to too great thickness, and the functionality and applicability of the heat-resistant layers are considered by reasonably designing the thickness of the heat-resistant layers.

In some embodiments, D ₂=D₃. In order to uniformly isolate thermal diffusion between the electrode assembly and the case, the sprayed thicknesses of both sides may be set to the same thickness in the case where both the inner and outer surfaces of the insulative body have the sprayed layers of the heat-resistant material and/or the heat-insulating material, thereby performing temperature isolation in all aspects and uniformly.

In some embodiments, the thickness of the insulating body is D ₄,0.05mm≤D₄ < 0.5mm. Considering that the first insulating piece is arranged between the battery cell group and the shell, in order to adapt to the space condition between the battery cell group and the shell, D ₄ is more than or equal to 0.05mm, so that the insulating body has effective material thickness, and the condition of poor insulating effect caused by too thin material is reduced; d ₄ is less than or equal to 0.5mm for the insulator can not influence normal equipment and the encapsulation of battery because of too thick, through reasonable design insulator's thickness, has taken into account insulator's functionality and suitability.

In some embodiments, the heat resistant layer is a coating disposed on a surface of the insulating body. The heat-resistant material and/or the heat-insulating material can be sprayed on the insulating body in a spraying manner to obtain a uniform coating serving as a heat-resistant layer, so that a uniform temperature isolation effect is realized.

In some embodiments, the first insulator is a heat resistant layer. The first insulating piece between the battery cell group and the shell can be directly manufactured by using various different types of heat-resistant materials and/or heat-insulating materials, so that the contact time of the battery cell group and the shell is delayed, and the heat diffusion between the battery cell group and the shell is reduced.

In some embodiments, the first insulator has a thickness D ₅,0.05mm≤D₅ ∈0.5mm. Considering that the first insulating piece is arranged between the battery cell group and the shell, in order to adapt to the space condition between the battery cell group and the shell, D ₅ is more than or equal to 0.05mm, so that the first insulating piece has effective material thickness, and the conditions of poor insulating effect and poor temperature isolation effect caused by too thin material are reduced; d ₅ is less than or equal to 0.5mm for the first insulating part can not influence normal equipment and the encapsulation of battery because of too thick, through the thickness of rationally designing first insulating part, has taken into account the functionality and the suitability of first insulating part.

In some embodiments, the heat resistant layer comprises: the heat-resistant layer comprises at least one layer of heat-resistant material and/or heat-insulating material; the heat-resistant material includes: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher; the heat insulating material comprises: ceramic material with heat conductivity less than 0.26, asbestos material, rock wool material, aerogel felt material. The heat-resistant layer with a single-layer structure or the heat-resistant layer with a multi-layer composite layer structure is manufactured by using various heat-resistant materials with higher melting points exceeding or equal to 150 ℃ and/or heat-insulating materials with lower heat conductivity, so that the stability of the heat-resistant layer under the condition that the battery cell group generates high temperature is effectively improved, the temperature isolation function is realized, and the temperature protection effect is effectively improved.

In some embodiments, if the heat resistant layer includes the metal material of the heat resistant materials, the metal material is disposed on a side of the heat resistant layer facing away from the cell group. Because the metal material has better conductivity, in order to enable the first insulating piece to have a corresponding insulating function, when the metal material is included in the heat-resistant layer, the metal material can be arranged on one side, away from the battery cell group, of the heat-resistant layer, so that the battery cell group is insulated and protected under the condition of realizing the high-temperature resistant function.

In some embodiments, if the heat resistant layer includes the thermal insulation material, the thermal insulation material is disposed on a side of the heat resistant layer proximate to the cell stack. When the heat-resistant layer comprises a heat-insulating material, the heat-insulating material can be arranged on one side of the heat-resistant layer close to the battery cell group in order to realize better heat-insulating performance, so that the distance between the heat-insulating material and the battery cell group is reduced, and the heat-insulating effect of the heat-resistant layer is improved.

In some embodiments, the material thickness of each layer structure in the heat resistant layer is D ₆,0.015mm≤D₆ +.0.5 mm. In the case that the heat-resistant layer has a composite multi-layer structure, the material thickness of each layer structure may be defined according to actual conditions to reasonably set the thickness of the heat-resistant layer, thereby reasonably setting the thickness of the first insulating member, and controlling the thickness of the first insulating member while achieving high temperature resistance and/or high heat insulation performance to achieve normal battery assembly.

In some embodiments, the battery cell group includes a plurality of the electrode assemblies, a plurality of the electrode assemblies being stacked. The electric core group can include a plurality of electrode assemblies that range upon range of setting, and first insulating part can unify the cladding to the electric core group that has a plurality of electrode assemblies, has improved insulating and high temperature resistant effect after the cladding effectively.

In a second aspect, an embodiment of the present application provides a battery, including a battery cell provided in any one of the embodiments of the first aspect.

In a third aspect, an embodiment of the present application provides an electric device, including the battery unit provided in any one of the embodiments of the first aspect, where the battery unit is used to provide electric energy for the electric device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application;

fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application;

Fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present application;

FIG. 4 is a schematic perspective view of the first insulating member shown in FIG. 3;

FIG. 5 is an enlarged partial cross-sectional view of a first type of the first insulator shown in FIG. 4 at A;

FIG. 6 is an enlarged partial cross-sectional view of a second type of the first insulator shown in FIG. 4 at A;

Fig. 7 is an enlarged partial sectional view of a third type of the first insulating member shown in fig. 4 at a;

Fig. 8 is an enlarged partial cross-sectional view of a fourth first insulator at a shown in fig. 4;

Fig. 9 is a schematic diagram showing a specific structure of the battery cell 10 shown in fig. 3;

Fig. 10 is a schematic view of the structure of the housing 11 shown in fig. 9.

Icon: 1-a housing; 11-a housing; 111-a first wall portion; 12-end caps; a 2-electrode assembly; 21-electrode lugs; 22-cell groups; 3-electrode terminals; 4-a current collecting member; 5-a first insulating member; 51-an insulating body; 511-an outer surface; 512-an inner surface; 52-a heat-resistant layer; 6-a second insulator; 61-blue glue; 62-blue film; 10-battery cell; 20-a box body; 201-a first part; 202-a second part; 100-cell; 200-a controller; 300-motor; 1000-vehicle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cells include, but are not limited to, lithium 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 storage batteries, and the like.

The 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 of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced, and meanwhile, active ions can pass through the separator.

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

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

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

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 conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., liFePO4 (which may also be abbreviated as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon. Examples of the lithium transition metal oxide may include, but are not limited to, at least one of lithium cobalt oxide (e.g., liCoO 2), lithium nickel oxide (e.g., liNiO 2), lithium manganese oxide (e.g., liMnO2, liMn2O 4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide (e.g., liNi1/3Co1/3Mn1/3O2 (may also be abbreviated as NCM 333), lini0.5co0.2mn0.3o2 (may also be abbreviated as NCM 523), lini0.5co0.25mn0.25o2 (may also be abbreviated as NCM 211), lini0.6co0.2mn0.2o2 (may also be abbreviated as NCM 622), lini0.8co0.1mn0.1o2 (may also be abbreviated as NCM 811), lithium nickel cobalt aluminum oxide (e.g., lini0.85co0.15 al0.05o2), and modified compounds thereof.

In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

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

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.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode 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, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

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.

In some embodiments, the separator is a separator film. The isolating film may be any known porous isolating film with excellent chemical and mechanical stability.

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 multilayer composite film. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.

In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, methylethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1, 4-butyrolactone, sulfolane, dimethyl sulfone, methyl sulfone, and diethyl sulfone. The solvent may also be selected from ether solvents. 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.

The gel electrolyte comprises a skeleton network taking a polymer as an electrolyte and is matched with ionic liquid-lithium salt.

Wherein the solid electrolyte comprises a polymer solid electrolyte, an inorganic solid electrolyte and a composite solid electrolyte.

As examples, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single ion polymer, polyion liquid-lithium salt, cellulose, or the like.

As an example, the inorganic solid electrolyte may include one or more of oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolyte (crystalline lithium super ion conductor (lithium germanium phosphorus sulfide, silver sulfur germanium mine), amorphous sulfide), and halide solid electrolyte, nitride solid electrolyte, and hydride solid electrolyte.

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

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

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

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of stacked segments stacked one on top of the other, with one positive electrode sheet sandwiched between adjacent stacked segments.

As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of stacked segments arranged in a stacked manner.

As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.

As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.

In some embodiments, the electrode assembly may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

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

As examples, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The inventor discovers that in the existing battery monomer, when thermal runaway occurs in the battery, the temperature and the air pressure of an electrode assembly in the battery rapidly rise, the temperature can be transferred to an outer shell of an outer layer, and then the temperature is transferred to an adjacent battery, so that the condition of heat diffusion of the adjacent battery can be caused, dangerous conditions such as fire and explosion are easy to cause, the safety of the battery is low, and the current use requirement cannot be met.

In view of this, the present application provides a battery cell including a housing; the battery cell group comprises at least one electrode assembly, and the battery cell group is accommodated in the shell; the first insulating piece is coated on the outer side of the battery cell group and is configured to insulate and isolate the electrode assembly from the shell; wherein the first insulating member comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, lambda is less than 0.26.

In such a battery cell, the first insulating member comprises a heat-resistant layer with a melting point C being larger than or equal to 150 ℃ and/or a heat conductivity coefficient lambda being smaller than 0.26, the heat-resistant layer can keep stability under the condition that the battery cell group generates high temperature, is not melted by the high temperature generated by the battery cell group, and reduces heat transfer between the battery cell group and the shell, so that heat diffusion between each battery is reduced, dangerous situations such as fire, explosion and the like are reduced, the safety of the battery is effectively improved, and the safety and stability of electric equipment in use are improved.

The battery cell described in the embodiment of the application is suitable for a battery and electric equipment using the battery cell.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a battery cell 10 and a case 20, and the battery cell 10 is accommodated in the case 20.

The case 20 is a component for accommodating the battery cell 10, the case 20 provides an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, the first portion 201 and the second portion 202 being overlapped with each other to define a receiving space for receiving the battery cell 10. The first portion 201 and the second portion 202 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first portion 201 may be a hollow structure with one side opened, and the second portion 202 may be a hollow structure with one side opened, and the open side of the second portion 202 is closed to the open side of the first portion 201, so as to form the case 20 having the accommodating space. The first portion 201 may be a hollow structure with one side open, the second portion 202 may be a plate-like structure, and the second portion 202 may be covered on the open side of the first portion 201 to form the case 20 having the accommodation space. The first portion 201 and the second portion 202 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

In the battery 100, the number of the battery cells 10 may be one or a plurality. If there are multiple battery cells 10, the multiple battery cells 10 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 10. The plurality of battery cells 10 may be connected in series or parallel or in series-parallel to form a battery module, and the plurality of battery modules may be connected in series or parallel or in series-parallel to form a whole and be accommodated in the case 20. All the battery cells 10 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 10 is accommodated in the case 20.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a case 1 and an electrode assembly 2, the electrode assembly 2 being accommodated in the case 1.

In some embodiments, the housing 1 may include a shell 11 and an end cap 12, the shell 11 having an opening, the end cap 12 closing the opening of the shell 11.

The case 11 is a member for accommodating the electrode assembly 2, and the case 11 may be a hollow structure having one end formed to be open, and the case 11 may be a hollow structure having opposite ends formed to be open. The housing 11 may be of various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, and the like. The material of the housing 11 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The end cap 12 is a member closing the opening of the case 11 to isolate the inner environment of the battery cell 10 from the outer environment. The end cap 12 defines a receiving space for receiving the electrode assembly 2, the electrolyte, and other components together with the case 11. The end cap 12 may be attached to the housing 11 by welding or crimping to close the opening of the housing 11. The shape of the end cover 12 may be adapted to the shape of the housing 11, for example, the housing 11 is a cuboid structure, the end cover 12 is a rectangular plate structure adapted to the housing 11, for example, the housing 11 is a cylindrical structure, and the end cover 12 is a circular plate structure adapted to the housing 11. The material of the end cap 12 may be various, for example, copper, iron, aluminum, steel, aluminum alloy, plastic, etc., and the material of the end cap 12 and the housing 11 may be the same or different.

In embodiments where the housing 11 is open at one end, the end caps 12 may be provided one for each. In the embodiment where the housing 11 is formed with openings at two opposite ends, two end caps 12 may be correspondingly disposed, and the two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space.

In some embodiments, the battery cell 10 may further include an electrode terminal 3, the electrode terminal 3 being provided on the case 1, the electrode terminal 3 being for electrical connection with the tab 21 of the electrode assembly 2 to output electrical energy of the battery cell 10. The electrode terminal 3 may be provided on the case 11 of the case 1 or may be provided on the end cap 12 of the case 1. The electrode terminal 3 and the tab 21 may be directly connected, for example, the electrode terminal 3 and the tab 21 may be welded. The electrode terminal 3 and the tab 21 may be indirectly connected, for example, the electrode terminal 3 and the tab 21 may be indirectly connected through the current collecting member 4. The current collecting member 4 may be a metal conductor such as copper, iron, aluminum, steel, aluminum alloy, or the like.

As an example, as shown in fig. 3, an opening is formed at one end of the housing 11, one end cap 12 in the casing 1, and one end cap 12 closes one opening of the housing 11. The end cap 12 is provided with two electrode terminals 3, the two electrode terminals 3 are a positive electrode terminal and a negative electrode terminal, a positive electrode tab and a negative electrode tab are formed at one end of the electrode assembly 2 facing the end cap 12, the positive electrode terminal and the positive electrode tab are connected through one current collecting member 4, and the negative electrode terminal and the negative electrode tab are electrically connected through the other current collecting member 4.

In some embodiments, please continue to refer to fig. 3, a battery cell 10 according to an embodiment of the present application includes: a housing 1; the battery cell group 22 includes at least one electrode assembly 2, and if there are a plurality of electrode assemblies 2, the plurality of electrode assemblies 2 may be stacked in a thickness direction of the electrode assemblies 2, and the battery cell group 22 is accommodated in the case 1; a first insulating member 5 coated on the outer side of the battery cell group 22, the first insulating member 5 being configured to insulate the electrode assembly 2 from the case 1; wherein the first insulating member 5 comprises a heat-resistant layer 52, the heat-resistant layer 52 has a melting point C, C is not less than 150 ℃, and/or the heat-resistant layer 52 has a heat conductivity coefficient lambda, lambda < 0.26.

As an example, the first insulating member 5 is wrapped around the outside of the battery cell group 22 in the circumferential direction of the opening of the housing 11.

The electrode assembly 2 may be a lamination structure or a winding structure. The electrode assembly 2 is flat, the thickness of the electrode assembly 2 is smaller than the width of the electrode assembly 2 and the height of the electrode assembly 2, and the electrode assembly 2 may have a substantially rectangular parallelepiped shape. The shape of the housing 11 may be designed according to the actual shape of the battery cell group 22, for example, the housing 11 may be in a cuboid shape, and the housing 11 is a hollow structure with an opening formed at one end to accommodate the battery cell group 22.

In the present embodiment, the first insulating member 5 having the heat-resistant layer 52 is wrapped on the outer side of the battery cell 22, so that the first insulating member 5 can be used as a temperature isolation component between the battery cell 22 and the housing 1, and the heat-resistant layer 52 has a higher melting point and/or a lower thermal conductivity, so that the first insulating member 5 has high temperature resistance and/or high heat insulation performance, and the temperature transmission between the battery cell 22 and the housing 1 can be effectively reduced. When the temperature and the air pressure of the electrode assembly 2 in the battery are increased, the first insulating piece 5 with high temperature resistance and/or high heat insulation performance can not be melted by the high temperature generated by the electrode assembly 2, isolate the high temperature generated by the electrode assembly 2, reduce the adverse condition that the high temperature on the electrode assembly 2 is transferred to the shell 1, further reduce the temperature transfer between the shell 1 and the adjacent battery, further reduce the dangerous conditions such as fire, explosion and the like caused by the thermal diffusion of the adjacent battery, effectively improve the safety and the stability of the battery, and be applicable to electric equipment for various applications.

With continued reference to fig. 4-8, fig. 4 is a schematic perspective view of the first insulating member 5 shown in fig. 3, fig. 5 is a partially enlarged sectional view of the first insulating member 5 shown in fig. 4, fig. 6 is a partially enlarged sectional view of the first insulating member 5 shown in fig. 4, fig. 7 is a partially enlarged sectional view of the first insulating member 5 shown in fig. 4, fig. 8 is a partially enlarged sectional view of the first insulating member 5 shown in fig. 4, and fig. 4.

In the embodiment shown in fig. 5, the first insulating member 5 may further include an insulating body 51, the melting point of the insulating body 51 being lower than the melting point of the heat-resistant layer 52, and/or the heat-resistant layer 52 having a heat conductivity lower than that of the insulating body 51, i.e., the heat-resistant layer 52 has high temperature resistance and/or high heat insulating property. The outer surface 511 of the insulating body 51 is provided with a heat-resistant layer 52 to achieve a temperature isolation effect by the heat-resistant layer 52 of high melting point. In the embodiment shown in fig. 6, the first insulating member 5 may further include an insulating body 51, the melting point of the insulating body 51 being lower than that of the heat-resistant layer 52, and/or the heat-resistant layer 52 having a heat conductivity lower than that of the insulating body 51, i.e., the heat-resistant layer 52 having high temperature resistance and/or high heat insulating property. The inner surface 512 of the insulating body 51 is provided with a heat-resistant layer 52 to achieve a temperature isolation effect by the heat-resistant layer 52 of high melting point. By providing the corresponding heat-resistant layer 52 on the outer surface 511 or the inner surface 512 of the original insulating body 51 to obtain the first insulating member 5 with high temperature resistance and/or high heat insulation performance, the manufacturing cost of the first insulating member 5 can be reduced, the contact time of the battery cell group 22 and the housing 1 can be effectively delayed, and the heat diffusion between the battery cell group 22 and the housing 1 can be reduced.

In some embodiments, since the first insulating member 5 is disposed between the battery cell group 22 and the case 11, in the case of having the insulating body 51 and the heat-resistant layer 52, in order to achieve normal packaging, the thickness of the insulating body 51 and the thickness of the heat-resistant layer 52 may be determined according to the volume parameters of the battery cell group 22 and the volume parameters of the case 1. For example, the size of the space between the battery cell 22 and the case 11 may be determined according to the volume parameter of the battery cell 22 and the volume parameter of the case 11, and the thickness of the insulating body 51 and the thickness of the heat-resistant layer 52 may be designed in case that the size of the space is satisfied.

In the embodiment shown in FIGS. 5 and 6, the thickness of the heat-resistant layer 52 is D ₁,1μm≤D₁≤300μm.D₁. Gtoreq.1 μm, so that the heat-resistant layer 52 has an effective material thickness, and the situation that the temperature isolation effect is poor due to too thin material is reduced; d ₁ is less than or equal to 300 mu m, so that the heat-resistant layer 52 cannot influence the normal assembly and encapsulation of the battery due to too thick, and the functionality and applicability of the heat-resistant layer 52 are considered by reasonably designing the thickness of the heat-resistant layer 52.

In the embodiment shown in fig. 7, the first insulating member 5 further includes an insulating body 51, and the melting point of the insulating body 51 is lower than that of the heat-resistant layer 52, and/or the heat-conductive coefficient of the heat-resistant layer 52 is lower than that of the insulating body 51, i.e., the heat-resistant layer 52 has high temperature resistance and/or high heat insulating property. The inner surface 512 and the outer surface 511 of the insulating body 51 are each provided with a heat-resistant layer 52 to achieve a temperature isolation effect by the heat-resistant layer 52 of high melting point. By providing the corresponding heat-resistant layer 52 on both the outer surface 511 and the inner surface 512 of the original insulating body 51 to obtain the first insulating member 5 with high temperature resistance and/or high heat insulation performance, the temperature isolation effect of the first insulating member 5 can be further improved, the contact time of the battery cell group 22 and the housing 1 can be effectively delayed, and the heat diffusion between the battery cell group 22 and the housing 1 can be reduced.

In the embodiment shown in fig. 7, the thickness of the heat-resistant layer 52 provided on the inner surface 512 of the insulating body 51 is D ₂, and the thickness of the heat-resistant layer 52 provided on the outer surface 511 of the insulating body 51 is D ₃,1μm≤D₂+D₃≤300μm.D₂+D₃ be 1 μm or more, so that the total thickness of the heat-resistant layers 52 on both sides of the insulating body 51 has an effective material thickness, and the situation that the temperature isolation effect is poor due to too thin material is reduced; and D ₂+D₃ is less than or equal to 300 mu m, so that the total thickness of the heat-resistant layers 52 on the two sides of the insulating body 51 cannot influence the normal assembly and encapsulation of the battery due to too great thickness, and the functionality and applicability of the heat-resistant layers 52 are considered by reasonably designing the thickness of the heat-resistant layers 52.

In the embodiment shown in fig. 7, D ₂=D₃. In order to uniformly isolate the thermal diffusion between the electrode assembly 2 and the case 1, in the case where both the inner surface 512 and the outer surface 511 of the insulating body 51 have heat-resistant material and/or heat-insulating material sprayed layers, the sprayed thicknesses of both sides may be set to the same thickness, for example, D ₂=D₃ =100 μm, so that the temperature isolation is performed uniformly and in all aspects.

In the embodiment shown in FIGS. 5-7, the thickness of the insulator body 51 is D ₄,0.05mm≤D₄ +.0.5 mm. Considering that the first insulating piece 5 is arranged between the battery cell group 22 and the shell 1, in order to adapt to the space condition between the battery cell group 22 and the shell 1, D ₄ is more than or equal to 0.05mm, the insulating body 51 has effective material thickness, and the condition of poor insulating effect caused by too thin material is reduced; d ₄ is less than or equal to 0.5mm, so that the normal assembly and encapsulation of the battery cannot be influenced by the thickness of the insulating body 51, and the functionality and applicability of the insulating body 51 are considered by reasonably designing the thickness of the insulating body 51.

In some embodiments, the insulating body 51 may be a PP (Polypropylene) material, where the PP material has a thermal conductivity coefficient ranging from 0.21 to 0.26, and can be used to cover the battery cell group 22, so as to prevent the separator from being scratched by the housing 1 when the battery cell group 22 is put into the housing, and also to perform an insulating function.

In some embodiments, the heat resistant layer 52 is a coating disposed on a surface of the insulating body 51.

The heat-resistant material and/or the heat-insulating material may be sprayed onto the insulating body 51 by spraying to obtain a uniform coating layer as the heat-resistant layer 52, thereby achieving a uniform temperature insulation effect. For example, the heat-resistant material and/or the heat-insulating material may be sprayed onto the surface of the insulating body 51 by a spraying method, which may be adapted to different substrate surfaces, and may be sprayed a plurality of times to obtain a desired coating thickness, which is convenient to use, easy to operate, and efficient. The surface of the insulating body 51 may be pretreated before spraying to reduce dust and other impurities on the surface of the insulating body 51, thereby ensuring that the sprayed layer can be firmly attached to the surface of the insulating body 51, and then preparing a corresponding heat-resistant material and/or heat-insulating material for spraying. The spraying may be performed by direct spraying, rolling or brushing, and the specific choice depends on the shape and size of the insulating body 51 and the desired thickness of the coating. After the spraying is completed, the heat-resistant material and/or the heat-insulating material on the surface of the insulating body 51 may be naturally air-dried or dried to form a firm sprayed layer.

In the embodiment shown in fig. 8, the first insulating member 5 is a heat-resistant layer 52. The first insulating member 5 between the battery cell 22 and the case 1 may be directly manufactured using various different types of heat-resistant materials and/or heat-insulating materials, thereby delaying the time for which the battery cell 22 is in contact with the case 1 and reducing the thermal diffusion between the battery cell 22 and the case 1.

In the embodiment of FIG. 8, the thickness of the first insulating member 5 is D ₅,0.05mm≤D₅. Ltoreq.0.5 mm. Considering that the first insulating piece 5 is arranged between the battery cell group 22 and the shell 1, in order to adapt to the space condition between the battery cell group 22 and the shell 1, D ₅ is more than or equal to 0.05mm, the first insulating piece 5 has effective material thickness, and the conditions of poor insulating effect and temperature isolation effect caused by too thin material are reduced; d ₅ is less than or equal to 0.5mm for the normal equipment and the encapsulation of battery can not be influenced because of too thick first insulating part 5, through rationally designing the thickness of first insulating part 5, compromise the functionality and the suitability of first insulating part 5.

Referring to fig. 9 and 10, fig. 9 is a schematic diagram of a specific structure of the battery cell 10 shown in fig. 3, and fig. 10 is a schematic diagram of a housing 11 shown in fig. 9. The housing 1 includes a case 11 and an end cap 12, the case 11 having an opening, the end cap 12 closing the opening, the case 11 having a first wall portion 111 disposed opposite to the opening; the battery cell 10 further includes a second insulating member 6, the second insulating member 6 being disposed between the first wall portion 111 and the cell group 22, the second insulating member 6 being configured to insulate the first wall portion 111 from the cell group 22. The housing 1 may include a case 11 having an opening and an end cap 12 closing the opening to accommodate the cell stack 22 and the first insulating member 5. In addition, a second insulating member 6 may be disposed between the first wall 111 corresponding to the opening of the housing 11 and the battery cell group 22, so as to fix the battery cell group 22 during packaging, and perform insulating treatment on the first wall 111, thereby improving packaging efficiency.

With continued reference to fig. 9, in some embodiments, the second insulating member 6 may be connected to the top first insulating member 5 by blue glue 61, and the outer portion of the housing 11 may be further provided with a blue film 62 to protect the housing 11.

In some embodiments, the heat resistant layer 52 may include at least one layer of heat resistant material and/or insulating material; the heat resistant material may include: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher; the insulating material may include: ceramic material with heat conductivity less than 0.26, asbestos material, rock wool material, aerogel felt material. The heat-resistant layer 52 with a single-layer structure or the heat-resistant layer 52 with a multi-layer composite layer structure is manufactured by using various heat-resistant materials with higher melting points exceeding or equal to 150 ℃ and/or heat-insulating materials with lower heat conductivity, so that the stability of the heat-resistant layer 52 under the condition that the battery cell group 22 generates high temperature is effectively improved, the temperature isolation function is realized, and the temperature protection effect is effectively improved.

In some embodiments, the plastic material in the heat resistant material may include: high temperature nylon PA46, PPA, PARA, PPS, polyaryletherketone (PAEK) type materials, polyimide (PI) type materials, polysulfone (PSU) type materials, polyarylate (PAR) type materials, liquid Crystal Polymer (LCP) materials, fluoroplastic type materials [ Polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer (ETFE), fluorinated Ethylene Propylene (FEP), polyvinylidene fluoride (PVDF) ] and the like, and the metal materials in the heat-resistant materials may include copper foil or aluminum foil and the like. The plastic material in the heat insulating material can comprise polyester, polyimide film, polyamide PA material, polyoxymethylene POM material, polyester PBT material, polycarbonate PC material, polyphenylene oxide PPO material and the like.

In some embodiments, if the heat-resistant layer 52 includes a metal material of the heat-resistant materials, the metal material of the heat-resistant materials may be disposed on a side of the heat-resistant layer 52 facing away from the battery cell group 22 in order to provide the first insulating member 5 with a corresponding insulating function, so that the first insulating member 5 performs a normal insulating protection on the battery cell group 22 under the condition of realizing the high temperature resistant function.

In some embodiments, if the heat-resistant layer 52 includes a heat-insulating material, the heat-insulating material may be disposed on a side of the heat-resistant layer 52 adjacent to the cell stack 22 to reduce a distance between the heat-insulating material and the cell stack 22, thereby improving the heat-insulating effect of the heat-resistant layer 52.

In some embodiments, the material thickness of each layer structure in the heat resistant layer 52 is D ₆,0.015mm≤D₆. Ltoreq.0.5 mm. In the case where the heat-resistant layer 52 has a composite multi-layer structure, the material thickness of each layer structure may be defined according to actual conditions to reasonably set the thickness of the heat-resistant layer 52, thereby reasonably setting the thickness of the first insulating member 5, and controlling the thickness of the first insulating member 5 while achieving high temperature resistance and/or high heat insulating performance to achieve normal battery assembly.

In the embodiment shown in fig. 5 to 7, the heat-resistant layer 52 may comprise a single layer structure of one layer, and the heat-resistant layer 52 having a double layer structure is obtained by combining with the insulating body 51 made of PP material, for example, a layer of PP material+a layer of heat-resistant material, for example: pp+pi (Polyimide)), pp+ceramic, which may be pp+pfa (Polyfluoroalkoxy, polyvinyl fluoride copolymer), pp+aluminum foil, pp+copper foil, or a layer of PP material+a layer of heat insulating material; the heat-resistant layer 52 may also be a multi-layered composite structure, and the heat-resistant layer 52 having a three-layered or more-layered structure is formed by combining the insulating body 51, for example, a layer of PP material+double-layered heat-resistant material, a layer of PP material+double-layered heat-insulating material, or a layer of PP material+single-layered heat-resistant material+single-layered heat-insulating material, and the types of materials selected for each layer may be the same or different. In some multi-layered composite structures, for example, in the case where the heat-resistant layer 52 includes one layer of heat-resistant material and/or heat-insulating material, the first insulating member 5 includes a double-layered structure of the insulating body 51 and one layer of functional material, the thickness D ₇ of the functional material may be set according to the thickness D ₄ of the insulating body 51, for example, 0.3D ₇/D₄ 0.7 may be set, for example, D ₇ =0.15 mm may be set when the thickness D ₄ =0.3 mm of the insulating body 51, to achieve an effective heat-insulating function and/or heat-resistant function. In the case where the heat-resistant layer 52 includes two layers of heat-resistant material and/or heat-insulating material, then the first insulating member 5 includes a three-layer structure composed of the insulating body 51 and two layers of functional material, the thickness ratio range of the three-layer structure can be set to 1 within the thickness range of the original insulating body 51: 1:1, for example, the insulating body 51 is set to 0.16mm, a layer of heat insulating material is set to 0.16mm, a layer of heat resistant material is set to 0.16mm, and the like, to achieve an effective heat insulating function and/or heat resistant function.

In the embodiment shown in fig. 8, the heat-resistant layer 52 may include a single-layer structure of one layer, for example, be directly made of one layer of heat-resistant material or one layer of heat-insulating material, and the heat-resistant layer 52 may be a multi-layer composite structure, for example, a double-layer heat-resistant material, a double-layer heat-insulating material, one layer of heat-resistant material+one layer of heat-insulating material, three-layer heat-resistant material, three-layer heat-insulating material, double-layer heat-resistant material+one layer of heat-insulating material, or double-layer heat-insulating material+one layer of heat-resistant material, and the types of materials selected for each layer may be the same or different. In some embodiments, where the heat resistant layer 52 comprises a double or triple layer structure, each layer of heat resistant material and/or insulating material may be provided at the same thickness, i.e., the ratio of the thicknesses of each layer of heat resistant material and/or insulating material is 1:1, for example, in a two-layer structure, the thickness of each layer of heat-resistant material and/or heat-insulating material is set to 0.25mm, and in a three-layer structure, the thickness of each layer of heat-resistant material and/or heat-insulating material is set to 0.16mm, to achieve an effective heat-insulating function and/or heat-resistant function.

In some embodiments, the cell stack 22 may include a plurality of electrode assemblies 2, with the plurality of electrode assemblies 2 being stacked. The electric core group 22 can include a plurality of electrode assemblies 2 that range upon range of setting, and first insulating member 5 can unify the cladding to the electric core group 22 that has a plurality of electrode assemblies 2, has improved insulating and high temperature resistant effect after the cladding effectively.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, the battery cell comprising:

a housing;

2. The battery cell of claim 1, wherein the first insulator further comprises an insulator body having a melting point lower than a melting point of the heat resistant layer and/or a thermal conductivity lower than a thermal conductivity of the insulator body;

The heat-resistant layer is provided on the outer surface or the inner surface of the insulating body.

3. The battery cell of claim 2, wherein the heat resistant layer has a thickness D ₁,1μm≤D₁ ∈300 μm.

4. The battery cell of claim 1, wherein the first insulator further comprises an insulator body having a melting point lower than a melting point of the heat resistant layer and/or a thermal conductivity lower than a thermal conductivity of the insulator body;

the heat-resistant layer is arranged on the inner surface and the outer surface of the insulating body.

5. The battery cell according to claim 4, wherein the heat-resistant layer provided on the inner surface of the insulative housing has a thickness D ₂, and the heat-resistant layer provided on the outer surface of the insulative housing has a thickness D ₃,1μm≤D₂+D₃ μm or less.

6. The battery cell of claim 5, wherein D ₂=D₃.

7. The battery cell of any one of claims 2-6, wherein the thickness of the insulative body is D ₄,0.05mm≤D₄ ∈0.5mm.

8. The battery cell of any one of claims 2-6, wherein the heat resistant layer is a coating disposed on a surface of the insulative body.

9. The battery cell of claim 1, wherein the first insulator is a heat resistant layer.

10. The battery cell of claim 9, wherein the first insulator has a thickness D ₅,0.05mm≤D₅ ∈0.5mm.

11. The battery cell of claim 1, wherein the heat resistant layer comprises at least one layer of a heat resistant material and/or a thermally insulating material;

The heat-resistant material includes: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher;

The heat insulating material comprises: ceramic material with heat conductivity less than 0.26, asbestos material, rock wool material, aerogel felt material.

12. The battery cell of claim 11, wherein if the heat resistant layer comprises the metal material of the heat resistant materials, the metal material is disposed on a side of the heat resistant layer facing away from the cell stack.

13. The battery cell of claim 11, wherein if the heat resistant layer comprises the thermal insulation material, the thermal insulation material is disposed on a side of the heat resistant layer adjacent to the cell stack.

14. The battery cell of claim 11, wherein each of the heat resistant layers has a material thickness D ₆,0.015mm≤D₆ ∈0.5mm.

15. The battery cell of claim 1, wherein the cell stack comprises a plurality of the electrode assemblies, the plurality of the electrode assemblies being stacked.

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

17. A powered device comprising a battery cell as claimed in any one of claims 1-15, the battery cell being configured to provide electrical energy to the powered device.