Battery monomer assembly, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer assembly, a battery device and electric equipment.The battery monomer assembly comprises an electric connecting piece, an insulating piece and at least two battery monomers, each battery monomer comprises a shell and a pole, the shell is provided with a first wall, the pole is arranged on the first wall, and the pole and the shell are opposite in electrical property; the electric connecting piece is electrically connected with the at least two battery monomers; an insulating part is arranged between the electric connecting part and the first wall of the at least one battery monomer, the melting point of the insulating part is Tm, and Tm is greater than or equal to 300 DEG C. As the melting point of the insulating part is not less than 300 DEG C, the probability of melting deformation of the insulating part under the condition of thermal runaway is low, and the insulating part maintains the initial state to continuously and effectively insulate and isolate the electric connecting part and the first wall, so that the contact between the shell and the electric connecting part under the condition of thermal runaway is prevented to a certain extent; therefore, the abnormal short circuit condition of the battery monomers is avoided to a certain extent.

Description

TECHNICAL FIELD

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

[0002] A plurality of battery monomers are connected through an electrical connector to meet the demand of large capacity. In the related art, taking a cylindrical battery monomer as an example, the cylindrical battery monomer includes a shell and a pole, the shell and the pole have opposite electrical properties, the electrical connector electrically connects at least two cylindrical battery monomers, and if the electrical connector electrically connects the pole, the electrical connector and the shell are easy to contact to cause short circuit in the case of thermal runaway of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the embodiments of the present application aim to provide a battery monomer assembly, a battery device and an electric equipment, the insulation member has a low probability of melting deformation in the case of thermal runaway, and the abnormal short circuit of the battery monomer can be avoided to a certain extent.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

[0005] The embodiments of the present application provide a battery monomer assembly, which comprises:

[0006] at least two battery monomers, the battery monomer comprising a shell and a pole, the shell having a first wall, and the pole being arranged on the first wall, the pole and the shell having opposite electrical properties;

[0007] an electrical connector electrically connecting the at least two battery monomers;

[0008] an insulation member arranged between the electrical connector and the first wall of the at least one battery monomer, the insulation member having a melting point Tm, and Tm≥300℃.

[0009] The battery monomer assembly provided by the embodiments of the present application has the insulation member arranged between the electrical connector and the first wall of the at least one battery monomer, that is, the insulation member insulates and separates the electrical connector and the first wall, the insulation member can effectively insulate in the normal state of the battery monomer, and the electrical connector is prevented from contacting the shell to a certain extent. In the case of thermal runaway of the battery monomer, the temperature in the shell rises to 200-250℃, since the melting point of the insulation member is not less than 300℃, the insulation member has a low probability of melting deformation in the case of thermal runaway, the insulation member maintains the initial form to continue to effectively insulate and separate the electrical connector and the first wall, and the shell and the electrical connector are prevented from contacting in the case of thermal runaway to a certain extent, thereby avoiding the abnormal short circuit of the battery monomer to a certain extent.

[0010] In some embodiments, 320℃≤Tm≤3000℃.

[0011] In this embodiment, the higher melting point of the insulating member can further reduce the risk of melting deformation of the insulating member, and improve the insulation reliability of the insulating member.

[0012] In some embodiments, the first wall faces a first direction, and a projection plane perpendicular to the first direction is a projection plane, and a projection of the insulating member covers a projection of the first wall; and / or,

[0013] The first wall faces a first direction, and a projection plane perpendicular to the first direction is a projection plane, and a projection of the insulating member covers a projection of the electric connecting member.

[0014] In this embodiment, the projection area of the insulating member can be greater than or equal to the projection area of the first wall. In this way, the insulating member can completely shield the first wall, and more effectively isolate the first wall and the electric connecting member. The projection area of the insulating member can be greater than or equal to the projection area of the electric connecting member. In this way, the insulating member can completely shield the electric connecting member, and more effectively isolate the electric connecting member and the first wall.

[0015] In some embodiments, the thickness of the insulating member is 0.01mm to 2mm.

[0016] In this embodiment, the thickness of the insulating member is moderate, which not only facilitates the manufacturing of the shape, but also takes into account the strength, and can effectively insulate and isolate the electric connecting member and the first wall.

[0017] In some embodiments, the insulating member is a ceramic structure, a rock wool structure, or a polyimide structure.

[0018] In this embodiment, ceramic, rock wool and polyimide all have good insulation performance and temperature resistance.

[0019] In some embodiments, the insulating member is spaced apart from or abuts the first wall, and the insulating member is spaced apart from or abuts the electric connecting member.

[0020] In this embodiment, the insulating member is not attached to the first wall and the electric connecting member. In this way, the insulating member can be an independent component, and the insulating member can be independent of the shell and the electric connecting member. The insulating member can be manufactured first and then assembled. In this way, the manufacturing difficulty of the insulating member can be reduced, and the shape of the insulating member can be set according to the needs.

[0021] In some embodiments, the first wall includes a first end face facing the electric connecting member, and the insulating member is attached to the first end face.

[0022] In the embodiment, the insulating member is connected to the first end face by adhesion, the insulating member is connected to the first end face synchronously in the manufacturing process, the housing provides support for the insulating member, and no assembly step is required between the insulating member and the first end face. In this way, the assembly step of the insulating member can be saved.

[0023] In some embodiments, the electrical connector includes a second end face facing the first wall, and the insulating member is attached to the second end face.

[0024] In the embodiment, the insulating member is connected to the second end face by adhesion, the insulating member is connected to the electrical connector synchronously in the manufacturing process, the electrical connector provides support for the insulating member, and no assembly step is required between the insulating member and the electrical connector. In this way, the assembly step of the insulating member can be saved.

[0025] In some embodiments, the electrical connector includes a second end face facing the first wall, and the insulating member is attached to the second end face.

[0026] In the embodiment, the second end face and the third end face are both connected to the insulating member by adhesion, the insulating member is connected to the electrical connector synchronously in the manufacturing process, the electrical connector provides support for the insulating member, and no assembly step is required between the insulating member and the electrical connector. In this way, the assembly step of the insulating member can be saved, and the third end face can also improve the insulation reliability.

[0027] In some embodiments, the insulating member is a spray-formed structure, a deposition-formed structure, or an anodization-formed structure.

[0028] In the embodiment, the insulating member can be attached to the surface of the first wall or the electrical connector by spraying, deposition, or anodization, and the insulating member has good adhesion to facilitate more uniform film formation on the surface of the first wall or the electrical connector.

[0029] In some embodiments, the battery cell is a cylindrical battery cell.

[0030] In the embodiment, the tab of the electrode assembly can be connected to the housing to make the housing charged. The insulating member can effectively insulate and isolate the housing and the electrical connector.

[0031] The battery device provided by the embodiments of the present application includes the battery cell assembly of the present application and has the same or corresponding beneficial effects as the battery cell assembly.

[0032] The battery device provided by the embodiments of the present application includes the battery cell assembly of the present application and has the same or corresponding beneficial effects as the battery cell assembly.

[0033] The embodiment of the present application further provides a power consuming device comprising the battery monomer assembly or the battery device described above, wherein the battery monomer is used for storing or providing electric energy, and the battery device is used for storing or providing electric energy.

[0034] The power consuming device provided by the embodiment of the present application comprises the battery monomer assembly of the present application, and has the same or corresponding beneficial effects as the battery monomer assembly. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic diagram of a vehicle in an embodiment of the present application;

[0036] Figure 2 FIG. 2 is a structural schematic diagram of a first battery monomer assembly in an embodiment of the present application;

[0037] Figure 3 FIG. 3 is a schematic diagram of another view of the first battery monomer assembly in FIG. 2; Figure 2

[0038] Figure 4 FIG. 4 is a schematic diagram of an A-A direction cross-sectional view of the first battery monomer assembly in FIG. 2; Figure 3

[0039] Figure 5 FIG. 5 is a cross-sectional schematic diagram of a second battery monomer assembly in an embodiment of the present application;

[0040] Figure 6 FIG. 6 is a cross-sectional schematic diagram of a third battery monomer assembly in an embodiment of the present application;

[0041] Figure 7 FIG. 7 is a cross-sectional schematic diagram of a fourth battery monomer assembly in an embodiment of the present application.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, battery monomer assembly; 1, battery monomer; 11, shell; 11a, first wall; 11b, accommodating cavity; 12, pole column; 13, electrode assembly; 2, electric connecting piece; 2a, second end face; 2b, third end face; 3, insulating piece. DETAILED DESCRIPTION

[0044] The embodiments of the technical solutions of the present application will be described in detail below with reference to the 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 be used to limit the protection scope of the present application.

[0045] ​​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 this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second" and the like 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 technical features indicated.

[0047] Reference herein to "an embodiment" 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 various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly understood that the embodiments described herein can be combined with each other, implicitly and explicitly.

[0048] It should be noted that in the present application, at least two includes two and more than two. Multiple includes two and more than two. The unit "℃" is Celsius. The unit "mm" is millimeter. The first direction is represented as X, wherein the first side of the first direction X is represented as X1, and the second side of the first direction X is represented as X2, the first side X1 and the second side X2 are two opposite sides of the first direction X.

[0049] Please refer to Figures 1 to 7 In order to understand the battery monomer assembly 10, the battery device 100 and the electric equipment provided by the embodiments of the present application, some basic structures of the battery monomer 1, the battery device 100 and the electric equipment provided by the embodiments of the present application are introduced.

[0050] The battery device 100 provided by the embodiments of the present application includes the battery monomer assembly 10 in any one of the embodiments of the present application.

[0051] The battery monomer assembly 10 includes at least two battery monomers 1.

[0052] In the embodiments of the present application, the battery monomer 1 can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0053] The battery monomer 1 can be a lithium ion battery monomer, a sodium ion battery monomer, a sodium lithium ion battery monomer, a lithium metal battery monomer, a sodium metal battery monomer, a lithium sulfur battery monomer, a magnesium ion battery monomer, a nickel hydrogen battery monomer, a nickel cadmium battery monomer or a lead storage battery monomer, etc. The embodiments of the present application are not limited thereto.

[0054] Please refer to Figures 2 to 4The battery cell 1 includes a case 11, which can be cylindrical or prismatic in shape. The battery cell 1 with a cylindrical case 11 can also be referred to as a cylindrical battery cell 1. The battery cell 1 with a prismatic case 11 can also be referred to as a polygonal battery cell. The polygonal battery cell can have a base shape of 5 sides or more. The polygonal battery cell can be, for example, a hexagonal battery cell, and the present application is not particularly limited. The first direction X can be the length direction of the case 11 for both the cylindrical battery cell 1 and the prismatic battery cell 1.

[0055] The case 11 can be made of metal. For example, the case 11 can be a steel case, an aluminum case, a composite metal case (e.g., a copper-aluminum composite case), or the like.

[0056] Referring to Figures 2 to 4 The battery cell 1 includes an electrode assembly 13 disposed in the accommodation cavity 11b of the case 11. The electrode assembly 13 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell 1, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator disposed between the positive electrode and the negative electrode can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0057] 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 disposed on at least one surface of the positive electrode current collector.

[0058] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0059] As an example, the positive electrode current collector can be 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, nickel, titanium, or silver, or the like can be used. 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 (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0060] 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 (e.g., LiFeP04(also referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (e.g., LiNi 0.8 Co 0.15 Al 0.05 O2), and modified compounds thereof. The modified compound refers to a substance obtained by a modification method such as doping or coating on the basis of the above-mentioned substances.

[0061] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0062] As an example, the negative 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, 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).

[0063] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0064] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0065] As an example, the negative active material can employ a negative active material for a battery cell 1 known in the art. As an example, the negative active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and 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 active material for a battery cell 1 can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0066] 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 active material, or of course, can be provided with a negative active material.

[0067] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0068] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0069] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0070] 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 member 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.

[0071] In some embodiments, the battery cell 1 further includes an electrolyte that functions to conduct ions between the positive electrode and the negative electrode. 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.

[0072] In the liquid electrolyte, the electrolyte salt and the solvent are included.

[0073] 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.

[0074] 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, butyl sulfone, dimethyl sulfone, 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.

[0075] In some embodiments, the electrolyte solution can further include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive that improves certain properties of the battery cell 1, such as an additive that improves overcharge / fast charge properties of the battery cell 1, an additive that improves high-temperature properties of the battery cell 1, an additive that improves low-temperature properties of the battery cell 1, etc.

[0076] In the gel electrolyte, a polymer is included as a skeleton network, and can be used in combination with an ionic liquid-lithium salt.

[0077] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, or a composite solid-state electrolyte.

[0078] As an example, the polymer of the polymer solid-state electrolyte can include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0079] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfur, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0080] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0081] In some embodiments, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 1 into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 1 with a cable tie.

[0082] In some embodiments, the battery device 100 can be a battery pack, which includes a case and one or more battery cell assemblies 10, and the battery cell assemblies 10 are accommodated in the case.

[0083] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be accommodated in the case by fixing the battery module in the case.

[0084] As an example, the battery cell assembly 10 can also be accommodated in the case by directly fixing a plurality of battery cells 1 in the case.

[0085] As an example, the case can include a first case and a second case. The first case and the second case are buckled so that a closed space is formed inside the case to accommodate the battery cell assembly 10. Here, closed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0086] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that a closed space is formed inside the case to accommodate the battery cell assembly 10.

[0087] In some embodiments, the box can be part of a chassis structure of the vehicle. For example, portions of the box can be part of a floor of the vehicle, or portions of the box can be part of cross members and longitudinal members of the vehicle.

[0088] Referring to Figure 1 and Figure 2 The power consuming device provided by the embodiments of the present application includes the battery monomer assembly 10 in any one of the embodiments of the present application or the battery device 100 in any one of the embodiments of the present application. The battery monomer 1 is used to store or provide electric energy, and the battery device 100 is used to store or provide electric energy.

[0089] The power consuming device includes but is not limited to an energy storage device, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a vehicle, a ship or a spacecraft, etc. The vehicle can include an electric vehicle and an electric car, etc., the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0090] In the following embodiments, for the convenience of description, the power consuming device in an embodiment of the present application is taken as a vehicle 1000 for example. The following is described in conjunction with the drawings.

[0091] Figure 1 A structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle, etc. As shown in Figure 1 The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom of the vehicle 1000 or at the front or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0092] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0093] In the related art, the electric properties of the pole and the shell are opposite, for example, the shell is negatively charged and the pole is positively charged. In some cases, the electrical connector electrically connects the pole of one battery cell and another battery cell. For the battery cell to which the electrical connector is electrically connected, the risk of short circuit between the shell and the electrical connector increases. In the case of thermal runaway of the battery cell, the temperature in the shell can reach 200-250℃. The shell forms a high-temperature and high-pressure environment, and the shell is prone to deformation towards the electrical connector. The shell and the electrical connector are short-circuited, the thermal runaway is worsened, and the heat may further spread to other battery cells.

[0094] Therefore, the battery cell assembly provided by the embodiments of the present application includes an electrical connector, an insulating member and at least two battery cells. The battery cell includes a shell and a pole. The shell has a first wall, and the pole is arranged on the first wall. The electric properties of the pole and the shell are opposite. The electrical connector electrically connects the at least two battery cells. The insulating member is arranged between the electrical connector and the first wall of the at least one battery cell. The melting point of the insulating member is Tm, and Tm≥300℃.

[0095] The battery cell assembly provided by the embodiments of the present application has the insulating member arranged between the electrical connector and the first wall of the at least one battery cell, that is, the insulating member insulates and isolates the electrical connector and the first wall. In the normal state of the battery cell, the insulating member can effectively insulate and, to some extent, prevent the electrical connector from contacting the shell. In the case of thermal runaway of the battery cell, the temperature in the shell rises to 200-250℃. Since the melting point of the insulating member is not less than 300℃, the probability of melting deformation of the insulating member in the case of thermal runaway is low. The insulating member maintains the initial form to continue to effectively insulate and isolate the electrical connector and the first wall, and to some extent, prevents the shell and the electrical connector from contacting in the case of thermal runaway, thereby preventing the abnormal short circuit of the battery cell to some extent.

[0096] The battery cell assembly 10 provided by the embodiments of the present application will be further described below in combination with the drawings. Referring to Figures 2 to 7 , the battery cell assembly 10 includes an electrical connector 2, an insulating member 3 and at least two battery cells 1.

[0097] The battery cell 1 includes a shell 11 and a pole 12. The shell 11 has a first wall 11a, and the pole 12 is arranged on the first wall 11a. The electric properties of the pole 12 and the shell 11 are opposite. For example, the pole 12 is positively charged and the shell 11 is negatively charged. For another example, the pole 12 is negatively charged and the shell 11 is positively charged.

[0098] For example, the first wall 11a has a first end face of a first side X1 facing a first direction X, and at least part of the pole 12 protrudes out of the first end face. That is, at least part of the pole 12 is exposed outside the shell 11.

[0099] At least part of the pole 12 protrudes from the first end face, which can be that the pole 12 protrudes from the first end face, or that the pole 12 is flush with the first end face.

[0100] The electrical connection 2 electrically connects the at least two battery cells 1. The electrical connection 2 is located outside the housing 11, and the electrical connection 2 electrically connects the at least two battery cells 1 to improve the capacity.

[0101] It should be noted that the electrical connection 2 electrically connects the at least two battery cells 1, which can realize series connection, parallel connection or mixed connection of the at least two battery cells 1.

[0102] Taking the series connection of two battery cells 1 as an example, the electrical connection 2 can connect the pole 12 of one of the battery cells 1 and the housing 11 of the other battery cell 1.

[0103] Taking the parallel connection of two battery cells 1 as an example, the electrical connection 2 can connect the poles 12 of the two battery cells 1.

[0104] It can be understood that in the case that the electrical connection 2 electrically connects the pole 12 of one battery cell 1, the electrical connection 2 can connect the pole 12 or the housing 11 of another battery cell 1, that is, series connection or parallel connection between two battery cells 1 can be realized. In the case that the electrical connection 2 electrically connects the housing 11 of a battery cell 1, no insulating member 3 can be arranged between the first wall 11a of the battery cell 1 and the electrical connection 2. For ease of understanding, the battery cell 1 whose pole 12 is electrically connected by the electrical connection 2 can be defined as a first battery cell, and the first wall 11a of the first battery cell and the electrical connection 2 can be provided with an insulating member 3; the battery cell 1 whose housing 11 is electrically connected by the electrical connection 2 can be defined as a second battery cell, and the first wall 11a of the second battery cell and the electrical connection 2 can not be provided with an insulating member 3.

[0105] The insulating member 3 is arranged between the electrical connection 2 and the first wall 11a of the at least one battery cell 1. That is, the insulating member 3 insulates and isolates the electrical connection 2 and the housing 11.

[0106] The melting point of the insulating member 3 is Tm, and Tm≥300℃. In other words, the melting point of the insulating member 3 is not less than 300℃. Exemplarily, Tm can be 300℃, 320℃, 350℃, 380℃, 400℃, 450℃, 500℃, 600℃, 700℃, 800℃, 1000℃ or 1500℃, etc.

[0107] The melting point of the insulating member 3 refers to the temperature at which the insulating member 3 changes from a solid state to a liquid state.

[0108] The melting point of the insulation piece 3 is in the sense known in the art and can be determined by methods and instruments known in the art. The melting point of the insulation piece 3 can be tested according to ASTM_D3418-2015.

[0109] The battery cell assembly 10 provided by the embodiments of the present application is provided with the insulation piece 3 between the electrical connecting piece 2 and the first wall 11a of the at least one battery cell 1, that is, the insulation piece 3 insulates and separates the electrical connecting piece 2 and the first wall 11a. In the normal state of the battery cell 1, the insulation piece 3 can effectively insulate and, to a certain extent, prevent the electrical connecting piece 2 from contacting the shell 11. In the case of thermal runaway of the battery cell 1, the temperature inside the shell 11 rises to 200-250°C. Since the melting point of the insulation piece 3 is not less than 300°C, the probability of melting deformation of the insulation piece 3 in the case of thermal runaway is low. The insulation piece 3 maintains the initial shape to continue to effectively insulate and separate the electrical connecting piece 2 and the first wall 11a, and to a certain extent, prevents the shell 11 and the electrical connecting piece 2 from contacting in the case of thermal runaway, thereby to a certain extent, avoiding the abnormal short circuit of the battery cell 1.

[0110] It can be understood that the normal state of the battery cell 1 refers to the state in which the battery cell 1 can input and output electric energy. Thermal runaway refers to a chain reaction phenomenon caused by various incentives. A large amount of heat and harmful gas emitted by thermal runaway can cause the temperature and pressure inside the shell 11 to rise.

[0111] In some embodiments, 320°C≤Tm≤3000°C. For example, Tm can be 320°C, 340°C, 360°C, 410°C, 440°C, 550°C, 650°C, 750°C, 900°C, 1600°C, 2000°C, or 3000°C, etc. A higher melting point of the insulation piece 3 can further reduce the risk of melting deformation of the insulation piece 3 and improve the insulation reliability of the insulation piece 3.

[0112] The connection mode of the electrical connecting piece 2 and the pole 12 is not limited. For example, the electrical connecting piece 2 and the pole 12 can be welded.

[0113] In some embodiments, referring to Figures 2 to 7 , at least part of the electrical connecting piece 2 can be located on the first side X1 of the first wall 11a along the first direction X. In this way, the electrical connecting piece 2 and the pole 12 can be electrically connected.

[0114] In some embodiments, referring to Figures 2 to 4The first wall 11a faces the first direction, with a plane perpendicular to the first direction X as its projection surface. The projection of the insulating member 3 covers the projection of the first wall 11a. For example, the projection of the insulating member 3 coincides with the projection of the first wall 11a. Or, for example, the projection of the first wall 11a is located within the projection area of ​​the insulating member 3. That is, the projection area of ​​the insulating member 3 can be greater than or equal to the projection area of ​​the first wall 11a. In this way, the insulating member 3 can completely block the first wall 11a, more effectively isolating the first wall 11a and the electrical connector 2.

[0115] In some embodiments, please refer to Figures 2 to 4 The first wall 11a faces the first direction, with a plane perpendicular to the first direction X as its projection surface. The projection of the insulating member 3 covers the projection of the electrical connector 2. For example, the projection of the insulating member 3 coincides with the projection of the electrical connector 2. Or, for example, the projection of the electrical connector 2 is located within the projection area of ​​the insulating member 3. That is, the projection area of ​​the insulating member 3 can be greater than or equal to the projection area of ​​the electrical connector 2. In this way, the insulating member 3 can completely block the electrical connector 2, more effectively isolating the electrical connector 2 and the first wall 11a.

[0116] In some embodiments, please refer to Figure 4 The thickness H of the insulating member 3 is from 0.01 mm to 2 mm. For example, the thickness H of the insulating member 3 can be 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.9 mm, or 2 mm, etc. The thickness H of the insulating member 3 refers to the dimension of the insulating member 3 along the first direction X. A moderate thickness H of the insulating member 3 not only facilitates manufacturing and shaping while maintaining strength, but also effectively insulates and isolates the electrical connector 2 and the first wall 11a.

[0117] In some embodiments, the insulating component 3 is a ceramic structure, a rock wool structure, or a polyimide structure. A ceramic structure means the insulating component 3 is made of ceramic. A rock wool structure means the insulating component 3 is made of rock wool. A polyimide structure means the insulating component 3 is made of polyimide. In other words, the insulating component 3 can be made of ceramic, rock wool, or polyimide. The melting point of ceramic can reach 2000°C or higher. The melting point of rock wool can reach 1000°C or higher. The melting point of polyimide can reach approximately 350°C. Ceramic, rock wool, and polyimide all possess good insulation and temperature resistance properties.

[0118] It is understandable that the materials used for the insulating layer include, but are not limited to, ceramics, rock wool, or polyimide.

[0119] In some embodiments, the insulating element 3 includes an insulating layer. That is, the insulating element 3 has a single-layer structure.

[0120] In some embodiments, the insulating member 3 comprises at least two layers of insulating isolation layers arranged in a stack. That is, the insulating member 3 is a multi-layer structure.

[0121] In some embodiments, the at least two layers of insulating isolation layers are made of the same material. For example, the two layers of insulating isolation layers are made of the same material. For another example, the three layers of insulating isolation layers are made of the same material. For yet another example, all the layers of insulating isolation layers are made of the same material. The insulating member 3 can be a multi-layer structure made of a single material.

[0122] In some embodiments, the at least two layers of insulating isolation layers are made of different materials. For example, the two layers of insulating isolation layers are made of different materials. For another example, the three layers of insulating isolation layers are made of different materials. For yet another example, all the layers of insulating isolation layers are made of different materials. That is, the insulating member 3 is a multi-layer composite structure made of multiple materials. A composite material is a material made of two or more materials with different properties through physical or chemical methods to form a material with new properties in a macroscopic view.

[0123] For example, in some embodiments, the insulating member 3 comprises at least two layers of insulating isolation layers arranged in a stack, and all the layers of insulating isolation layers can be ceramic insulating isolation layers.

[0124] For example, in some embodiments, the insulating member 3 comprises two layers of insulating isolation layers arranged in a stack, one of which can be a ceramic insulating isolation layer, and the other of which can be a polyimide insulating isolation layer.

[0125] It should be noted that at least two layers means two layers or more than two layers.

[0126] In some embodiments, referring to Figures 2 to 4 The insulating member 3 is spaced apart from or abuts against the first wall 11a, and the insulating member 3 is spaced apart from or abuts against the electrical connecting member 2. That is, the insulating member 3 is not attached to the first wall 11a and the electrical connecting member 2. In this way, the insulating member 3 can be an independent component, the insulating member 3 can be independent of the housing 11 and the electrical connecting member 2, the insulating member 3 can be manufactured into a shape first and then assembled, which can reduce the manufacturing difficulty of the insulating member 3, and also can set the shape of the insulating member 3 according to the needs.

[0127] It should be noted that the insulating member 3 can be an independent component means that the insulating member 3 is manufactured into a shape independently of the housing 11 and the electrical connecting member 2, and the insulating member 3 is assembled between the housing 11 and the electrical connecting member 2 after being manufactured into a shape. For example, the insulating member 3 is manufactured into a shape, and then is fixedly connected with the pole 12. The pole 12 provides support for the insulating member 3.

[0128] In some embodiments, referring to Figures 2 to 4The insulation member 3 is spaced apart from the first wall 11a, and the insulation member 3 is spaced apart from the electrical connecting member 2. That is, a gap is formed between the insulation member 3 and the first wall 11a, and a gap is formed between the insulation member 3 and the electrical connecting member 2, and the insulation member 3 is not attached to the first wall 11a and the electrical connecting member 2.

[0129] In some embodiments, referring to Figure 5 The first wall 11a includes a first end surface facing the electrical connecting member 2, and the insulation member 3 is attached to the first end surface. That is, the insulation member 3 is connected to the first end surface by the adhesive force, and the insulation member 3 is simultaneously connected to the first end surface in the manufacturing process, the housing 11 provides support for the insulation member 3, and no assembly step is required between the insulation member 3 and the first end surface. In this way, the assembly step of the insulation member 3 can be saved.

[0130] It can be understood that the adhesive force is the mutual attraction between two different substances in contact. This attraction is a manifestation of the mutual attraction between the molecules of the two substances.

[0131] In some embodiments, referring to Figure 6 The electrical connecting member 2 includes a second end surface 2a facing the first wall 11a, and the insulation member 3 is attached to the second end surface 2a. The second end surface 2a is a surface of the electrical connecting member 2 facing the first wall 11a. The insulation member 3 is connected to the second end surface 2a by the adhesive force, and the insulation member 3 is simultaneously connected to the electrical connecting member 2 in the manufacturing process, the electrical connecting member 2 provides support for the insulation member 3, and no assembly step is required between the insulation member 3 and the electrical connecting member 2. In this way, the assembly step of the insulation member 3 can be saved.

[0132] In some embodiments, referring to Figure 7 The electrical connecting member 2 includes a second end surface 2a and a third end surface 2b, the second end surface 2a faces the first wall 11a, and the third end surface 2b is connected to the second end surface 2a. The second end surface 2a and the third end surface 2b are both attached with the insulation member 3. The third end surface 2b is a circumferential surface of the electrical connecting member 2. The second end surface 2a and the third end surface 2b are both connected to the insulation member 3 by the adhesive force, and the insulation member 3 is simultaneously connected to the electrical connecting member 2 in the manufacturing process, the electrical connecting member 2 provides support for the insulation member 3, and no assembly step is required between the insulation member 3 and the electrical connecting member 2. In this way, the assembly step of the insulation member 3 can be saved, and the third end surface 2b can also improve the insulation reliability.

[0133] It can be understood that the insulation member 3 abuts against the first wall 11a means that the insulation member 3 is in contact with the first wall 11a, but there is no adhesive force. The insulation member 3 abuts against the electrical connecting member 2 means that the insulation member 3 is in contact with the electrical connecting member 2, but there is no adhesive force.

[0134] In some embodiments, the insulation member 3 is a spray forming structure, a deposition forming structure, or an anodizing forming structure.

[0135] Spray forming structure refers to a structure formed by a spray process. The spray process is a coating method in which an insulating material is dispersed into uniform and fine mist droplets by means of pressure or centrifugal force, and applied to the surface of a coated object (the surface of the first wall 11a or the electrical connecting member 2).

[0136] Deposition forming structure refers to a structure formed by a deposition process. The deposition process is a process of plating by a method of evaporation or sputtering. For example, chemical vapor deposition, physical vapor deposition, and the like.

[0137] Anodic oxidation forming structure refers to a structure formed by an anodic oxidation process. The anodic oxidation process is a process of electrochemically plating by taking the first wall 11a or the electrical connecting member 2 as an anode.

[0138] In this embodiment, the insulating member 3 can be attached to the surface of the first wall 11a or the electrical connecting member 2 by spraying, deposition, or anodic oxidation, and the like. The insulating member 3 has good adhesion so as to facilitate more uniform plating on the surface of the first wall 11a or the electrical connecting member 2.

[0139] In some embodiments, the battery cell 1 is a cylindrical battery cell. The tab of the electrode assembly 13 can be connected to the case 11 so that the case 11 is charged. The insulating member 3 can effectively insulate and isolate the case 11 and the electrical connecting member 2.

[0140] In some embodiments, the positive electrode, the separator, and the negative electrode can be wound to form the electrode assembly 13. The winding direction of the positive electrode, the separator, and the negative electrode is a direction of winding around a straight line extending in the first direction X. That is, the electrode assembly 13 can be a wound structure.

[0141] In some embodiments, the shape of the electrode assembly 13 can be cylindrical or prismatic, or the like.

[0142] The electrical connecting member 2 has a conductive function, and the electrical connecting member 2 can be made of a conductive material. For example, the electrical connecting member 2 is made of a metal material, such as copper, aluminum, or a copper-aluminum composite material, or the like.

[0143] The pole 12 has a conductive function, and the pole 12 can be made of a conductive material. For example, the pole 12 is made of a metal material, such as copper, aluminum, or a copper-aluminum composite material, or the like.

[0144] In some embodiments, the case 11 has a receiving cavity 11b, and the electrode assembly 13 and the electrolyte are both accommodated in the receiving cavity 11b. The case 11 can provide protection for the electrode assembly 13 and the electrolyte, and the like.

[0145] In some embodiments, the positive electrode is electrically connected to the electrical connecting member 2, and the negative electrode is electrically connected to the case 11. That is, the electrical connecting member 2 is positively charged, and the case 11 is negatively charged.

[0146] In some embodiments, the electrode assembly 13 is provided with tabs that can conduct current out of the electrode assembly 13. The tabs include positive tabs and negative tabs. The positive tabs are provided on the positive electrode and the negative tabs are provided on the negative electrode. In some embodiments, the positive tabs can be electrically connected to the pole 12 and the negative tabs can be electrically connected to the housing 11. In other embodiments, the negative tabs can be electrically connected to the pole 12 and the positive tabs can be electrically connected to the housing 11.

[0147] In some embodiments, the battery cell 1 includes a current collector plate located within the receiving cavity 11b, the current collector plate is disposed on a first side X1 of the electrode assembly 13 along the first direction X, the positive tabs are electrically connected to the current collector plate, and the pole 12 is electrically connected to the current collector plate. In this way, electrical conduction is achieved between the positive electrode and the pole 12.

[0148] The connection between the positive tabs and the current collector plate is not limited and can include, for example, but is not limited to, welding.

[0149] The connection between the pole 12 and the current collector plate is not limited and can include, for example, but is not limited to, welding.

[0150] The connection between the negative tabs and the housing 11 is not limited and can include, for example, but is not limited to, welding. In some embodiments, the battery cell 1 includes a negative current collector, the negative tabs are electrically connected to the negative current collector, and the negative current collector is electrically connected to the housing 11.

[0151] The current collector plate has a conductive function and can be made of a conductive material. For example, the current collector plate can be made of a conductive metal material, such as aluminum or copper, etc.

[0152] The negative current collector has a conductive function and can be made of a conductive material. For example, the negative current collector can be made of a conductive metal material, such as aluminum or copper, etc.

[0153] For example, the negative current collector is disposed on a second side X2 of the electrode assembly 13 along the first direction X, the negative tabs are welded to the negative current collector, and the negative current collector is welded to the housing 11.

[0154] For example, the first wall 11a is formed with a relief opening, the pole 12 is disposed through the relief opening, one end of the pole 12 is electrically connected to the current collector plate, and the other end of the pole 12 is electrically connected to the electrical connector 2.

[0155] In some embodiments, the housing 11 includes an end cap and a shell, the shell is provided with an opening, and the end cap is disposed on the opening. The end cap and the shell together form the receiving cavity 11b. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0156] For example, the pole 12 can be disposed on the end cap. For example, the end cap has a first wall 11a, and the end cap forms a relief opening.

[0157] The shell 11 is insulated from the pole 12. That is, the shell 11 and the pole 12 are not electrically conductive. For example, an insulating ring can be sleeved on the outer periphery of the pole 12, and the outer peripheral surface of the insulating ring contacts the wall surface of the avoiding port. In this way, the insulating ring insulates the pole 12 and the shell 11 to prevent electrical conduction between the shell 11 and the pole 12.

[0158] In some embodiments, the plurality of battery monomers 1 can be connected in series, in parallel, or in a mixed manner through the electrical connector 2. The electrical connector 2 is used to realize the electrical connection between the plurality of battery monomers 1.

[0159] For example, the mixed connection means that at least two battery monomers 1 are connected in series and in parallel. At least two battery monomers 1 can be directly connected in series, in parallel, or in a mixed manner; of course, at least two battery monomers 1 can be first connected in series, in parallel, or in a mixed manner to form a module, and then the module is connected in series, in parallel, or in a mixed manner to form a whole.

[0160] The outer contour shape of the projection of the electrical connector 2 on the projection plane perpendicular to the first direction X is not limited, for example, the outer contour shape of the projection of the electrical connector 2 on the projection plane can be circular, oval, rectangular, or irregular, etc.

[0161] In some embodiments, the battery monomer 1 includes an insulating wrapping member, and the insulating wrapping member wraps the outer periphery of the electrode assembly 13 around the first direction X. The insulating wrapping member can prevent the outer periphery of the electrode assembly 13 from contacting the shell 11.

[0162] It should be noted that the outer periphery of the electrode assembly 13 refers to the direction of the electrode assembly 13 around the straight line extending along the first direction X.

[0163] The insulating wrapping member has an insulating function, and the material of the insulating wrapping member includes but is not limited to polypropylene and / or Mylar film (also known as blue film), etc.

[0164] The insulating wrapping member can include one wrapping film layer or at least two wrapping film layers. For example, in some embodiments, the insulating wrapping member can adopt a polypropylene wrapping film layer or a Mylar film wrapping film layer. In some embodiments, the insulating wrapping member can include two wrapping film layers, one of which can be a polypropylene wrapping film layer, and the other of which can be a Mylar film wrapping film layer, and the Mylar film wrapping film layer can be wrapped on the outer periphery of the polypropylene wrapping film layer.

[0165] It should be noted that at least two wrapping film layers refer to the number of wrapping film layers being two or more.

[0166] In some embodiments, the shell 11 is provided with a pressure relief mechanism. The pressure relief mechanism is used to discharge the internal gas of the battery monomer 1.

[0167] As an example, the battery cell 1 is actuated to release internal pressure or temperature when the internal pressure or temperature reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 1 reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold is designed differently according to design requirements. The threshold can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 1.

[0168] In a specific embodiment, referring to Figures 2 to 4 , the battery cell assembly 10 includes the electrical connector 2, the insulating member 3, and at least two battery cells 1. The battery cell 1 includes the housing 11 having the first wall 11a and the pole 12 disposed on the first wall 11a, and the pole 12 and the housing 11 are electrically opposite. The electrical connector 2 is located outside the housing 11. 320℃≤Tm≤3000℃. The first wall 11a faces a first direction, and the projection of the insulating member 3 covers the projection of the first wall 11a, and the projection of the insulating member 3 covers the projection of the electrical connector 2. The thickness H of the insulating member 3 is 0.01mm to 2mm. The insulating member 3 is spaced apart from the first wall 11a, and the insulating member 3 is spaced apart from the electrical connector 2.

[0169] In this embodiment, 320℃≤Tm≤3000℃, and a higher melting point of the insulating member 3 can further reduce the risk of melting deformation of the insulating member 3 and improve the insulation reliability of the insulating member 3. The projection of the insulating member 3 covers the projection of the first wall 11a, and the projection of the insulating member 3 covers the projection of the electrical connector 2, so that the insulating member 3 can completely shield the first wall 11a and more effectively isolate the first wall 11a and the electrical connector 2. The insulating member 3 can completely shield the electrical connector 2 and more effectively isolate the electrical connector 2 and the first wall 11a. The thickness H of the insulating member 3 is 0.01mm to 2mm. The thickness H of the insulating member 3 is moderate, which not only facilitates manufacturing and strength, but also effectively insulates and isolates the electrical connector 2 and the first wall 11a. The insulating member 3 can be an independent component, and the insulating member 3 can be independent of the housing 11 and the electrical connector 2. The insulating member 3 can be manufactured first and then assembled. This design can reduce the manufacturing difficulty of the insulating member 3 and also allow the shape of the insulating member 3 to be set according to requirements.

[0170] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and in particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner.

Claims

1. A battery cell assembly, characterized in that, include: At least two battery cells, each battery cell including a housing and a terminal, the housing having a first wall, the terminal disposed on the first wall, the terminal and the housing having opposite electrical properties; An electrical connector that electrically connects at least two of the battery cells; An insulating element is provided between the electrical connector and the first wall of at least one of the battery cells, the insulating element having a melting point of Tm, where Tm ≥ 300°C.

2. The battery cell assembly according to claim 1, characterized in that, 320℃≤Tm≤3000℃.

3. The battery cell assembly according to claim 1, characterized in that, The first wall faces a first direction, with a plane perpendicular to the first direction as its projection plane, and the projection of the insulating element covers the projection of the first wall; and / or, The first wall faces the first direction, with a plane perpendicular to the first direction as the projection plane, and the projection of the insulating component covers the projection of the electrical connector.

4. The battery cell assembly according to claim 1, characterized in that, The thickness of the insulating element is from 0.01 mm to 2 mm.

5. The battery cell assembly according to claim 1, characterized in that, The insulating component is a ceramic structure, a rock wool structure, or a polyimide structure.

6. The battery cell assembly according to any one of claims 1 to 5, characterized in that, The insulating element is spaced apart from or abuts against the first wall, and the insulating element is spaced apart from or abuts against the electrical connector.

7. The battery cell assembly according to claim 1, characterized in that, The first wall includes a first end face facing the electrical connector, and the insulating element is attached to the first end face.

8. The battery cell assembly according to claim 1, characterized in that, The electrical connector includes a second end face facing the first wall, and the insulating element is attached to the second end face.

9. The battery cell assembly according to claim 1, characterized in that, The electrical connector includes a second end face and a third end face, the second end face facing the first wall, the third end face being connected to the second end face, and the insulating element being attached to both the second end face and the third end face.

10. The battery cell assembly according to any one of claims 7 to 9, characterized in that, The insulating component is a spray-coated structure, a deposition-coated structure, or an anodized structure.

11. The battery cell assembly according to any one of claims 1 to 5, characterized in that, The battery cell is a cylindrical battery cell.

12. A battery device, characterized in that, Includes the battery cell assembly as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, Includes a battery cell assembly according to any one of claims 1 to 11 or a battery device according to claim 12, wherein the battery cell is used to store or provide electrical energy, and the battery device is used to store or provide electrical energy.

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