Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery device and electric equipment.The battery device comprises at least two battery monomers and a heat exchange assembly, the heat exchange assembly is arranged on the bottom sides of the at least two battery monomers and comprises at least two heat exchange pieces, and at least one heat exchange piece is a flexible piece; the at least one heat exchange piece is a rigid piece, the flexible piece and the rigid piece are arranged in a stacked mode to form a medium flow channel, the medium flow channel is used for conducting a heat exchange medium, and the heat exchange medium is used for conducting heat exchange with the at least two single batteries; the flexible part is of a layered structure and comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially arranged in a stacked mode. Insulating parts are arranged between the heat exchange assembly and the at least two single batteries. The sides, close to the battery monomers, of the heat exchange assemblies are easy to contact with the battery monomers or need to contact with the battery monomers, the insulating parts are located between the battery monomers and the heat exchange assemblies, electric conduction between the battery monomers and the heat exchange assemblies can be prevented, electric leakage risks are reduced, and safety is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical equipment. Background Art

[0002] A battery device can be used to store or provide electrical energy. The battery device can be used in electrical equipment. For example, the battery device can be used in vehicles and the like.

[0003] In related technologies, taking a vehicle as an example, in a vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. During the use of the battery device, the temperature of the battery cells in the battery device will rise, and it is necessary to control the temperature of the battery cells. Otherwise, it is likely to have an adverse impact on the performance and service life of the battery device. Therefore, how to reduce the risk of electric leakage while adjusting the temperature of the battery cells through a heat exchange component has become an important research direction in this field. Summary of the Utility Model

[0004] In view of this, embodiments of this application are expected to provide a battery device and an electrical equipment. An insulating member is located between the battery cells and the heat exchange component, which can prevent conduction between the battery cells and the heat exchange component.

[0005] To achieve the above object, the technical solution of the embodiments of this application is realized as follows:

[0006] Embodiments of this application provide a battery device, including:

[0007] At least two battery cells;

[0008] A heat exchange component, disposed on the bottom side of the at least two battery cells. The heat exchange component includes at least two heat exchange elements, at least one of the heat exchange elements is set as a flexible element, and at least one of the heat exchange elements is set as a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells; the flexible element is a layered structure, and the flexible element includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence;

[0009] Wherein, an insulating member is disposed between the heat exchange component and the at least two battery cells.

[0010] The battery device provided by the embodiment of the present application, the heat exchange component is used for heat exchange with the battery cell. By setting the heat exchange component to include a flexible member and a rigid member, the flexible member has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component, reducing the production cost of the heat exchange component, and is also beneficial to reducing the mass of the battery device. The rigid member can enhance the structural strength of the heat exchange component, so as to facilitate the heat exchange component to better carry the battery cell. The flexible member and the rigid member are stacked to form at least one medium flow channel. The rigid member can support the flexible member, which is beneficial to improving the overall structural strength and stability of the heat exchange component and improving the applicability of the heat exchange component. The side of the heat exchange component close to the battery cell is likely to or needs to contact the battery cell. The insulating member is located between the battery cell and the heat exchange component, which can prevent conduction between the battery cell and the heat exchange component, reduce the risk of electric leakage, and enhance safety. The flexible member composed of a metal layer and a non-metal layer stacked in sequence has a thin thickness and a small weight. And by forming a medium flow channel between the flexible member and the rigid member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0011] In some embodiments, the insulating member is disposed on the top surface of the heat exchange component.

[0012] In this embodiment, the insulating member is disposed on the top surface of the heat exchange component. The heat exchange component can provide an installation position for the insulating member, and the insulating member can better fit the top surface of the battery cell to insulate and isolate the heat exchange component and the battery cell.

[0013] In some embodiments, the insulating member is coated or adhered to the top surface of the heat exchange component.

[0014] In this embodiment, the insulating member is coated on the top surface of the heat exchange component. The insulating member and the top surface of the heat exchange component can be tightly combined through intermolecular forces, with strong adhesion, which can reduce the risk of the insulating member falling off from the top surface of the heat exchange component. The insulating member can be independently manufactured and then assembled to the top surface of the heat exchange component through an adhesive substance. The assembly steps are simple, the yield rate is high, and the production cost is relatively low.

[0015] In some embodiments, the rigid member is connected to the top side of the flexible member, the insulating member is disposed on the top surface of the rigid member, and the at least two battery cells are connected to the insulating member.

[0016] In this embodiment, the rigid member provides a supporting force to carry the battery cell and the insulating member. The insulating member isolates the rigid member and the battery cell, which can avoid conduction between the battery cell and the heat exchange component. The flexible member is connected to the bottom side of the rigid member, and the flexible member does not contact the battery cell, which can avoid the battery cell squeezing the flexible member.

[0017] In some embodiments, the battery device includes a box body, at least two battery cells are disposed in the box body, and the rigid member is configured as a part of the box body.

[0018] In this embodiment, the rigid member is configured as a part of the box body. That is to say, the rigid member is used to form a medium flow channel by laminating with the flexible member, and the rigid member is also used to constitute the box body. Such a design can reduce the number of components of the battery device and is beneficial to reducing the weight of the battery device.

[0019] In some embodiments, the box body includes a box main body, the rigid member includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, taking the plane perpendicular to the top-bottom direction as the projection plane, the projection of the flexible member is located within the projection range of the main body area, the flexible member and the main body area define the medium flow channel, the avoidance area is connected to the box main body, the rigid member and the box main body jointly define a receiving cavity, and at least two battery cells are located in the receiving cavity.

[0020] In this embodiment, the rigid member and the box main body jointly define a receiving cavity, at least two battery cells are located in the receiving cavity, the rigid member is a part of the side wall of the box body, which plays a role in protecting the battery cells. The size of the flexible member is smaller than that of the rigid member, the flexible member is within the range of the main body area, and the flexible member is basically not in contact with the avoidance area, thereby reducing the influence on the flexible member during the assembly process of the avoidance area and the box main body.

[0021] In some embodiments, the flexible member includes a metalized plastic film.

[0022] In this embodiment, since the metalized plastic film has a thin thickness and small weight, and a medium flow channel is formed between the metalized plastic film and the rigid member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, since the metalized plastic film has the characteristics of insulation and corrosion prevention of the heat exchange medium, the possibility of insulation failure can be reduced, and the risk of reaction between the heat exchange component and the internally flowing heat exchange medium can also be reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0023] In some embodiments, the flexible member includes an aluminum-plastic film.

[0024] In this embodiment, the flexible member uses an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the insulation and anti-corrosion requirements.

[0025] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil; and / or,

[0026] The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0027] In this embodiment, by setting the metal layer as one of aluminum foil, copper foil, and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer as one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member can have a certain waterproof function and / or corrosion resistance to heat exchange media.

[0028] In some embodiments, the non-metal layer is a hot melt layer.

[0029] In this embodiment, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to composite the non-metal layer with the metal layer through hot melting, with simple molding and high production efficiency.

[0030] In some embodiments, the thickness of the flexible member is 0.05 mm - 0.3 mm.

[0031] In this embodiment, by setting the thickness of the flexible member as 0.05 mm - 0.3 mm, while the heat exchange component made of the flexible member has a certain structural strength, the overall thickness of the heat exchange component is relatively small, which is beneficial to reducing the overall volume and weight of the battery device, so as to increase the energy density of the battery device.

[0032] In some embodiments, the thickness of the flexible member is 0.08 mm - 0.2 mm.

[0033] In this embodiment, by setting the thickness of the flexible member as 0.08 mm - 0.2 mm, while the heat exchange component made of the flexible member has a certain structural strength, the overall thickness of the heat exchange component is further reduced, which is beneficial to further reducing the overall volume and weight of the battery device, so as to further increase the energy density of the battery device.

[0034] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa - 10,000 MPa.

[0035] In this embodiment, by setting the elastic modulus of the flexible member as 0.1 MPa - 10,000 MPa, the flexible member not only has a certain structural strength to improve the reliability of the heat exchange component, but also has a certain deformation ability, which can improve the fitting degree between the heat exchange component and the box body and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box body and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0036] In some embodiments, the rigid member is set as a metal plate.

[0037] In this embodiment, by setting the rigid member as a metal plate, the metal plate not only has good structural strength but also has good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange component, the rigid member can also play a certain supporting role for the flexible member.

[0038] An embodiment of the present application provides an electrical device, including the battery device described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a vehicle in some embodiments of the present application;

[0040] Figure 2 is an exploded view of the battery device in some embodiments of the present application;

[0041] Figure 3 is Figure 2 an exploded view of the heat exchange component in

[0042] Figure 4 is Figure 3 an assembled view of the heat exchange component in

[0043] Figure 5 is an exploded view of the heat exchange component and the insulating member in some embodiments of the present application;

[0044] Figure 6 is an exploded view of the heat exchange component and the insulating member in other some embodiments of the present application.

[0045] DESCRIPTION OF THE REFERENCE NUMERALS

[0046] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible member; 22, rigid member; 221, avoidance area; 222, main body area; 23, connecting member; 2100, insulating member; 2200, adhesive layer; 3, box body; 31, annular frame; 32, top cover; 33, bottom guard plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0049] As used herein, the term "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0050] 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.

[0051] Please refer to Figures 1 to 3 , for ease of understanding the battery device 100 and the electrical device provided in the embodiments of the present application, some basic structures of the battery cell 1, the battery device 100, and the electrical device provided in the embodiments of the present application will be introduced first.

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

[0053] The battery cell 1 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0054] The battery cell 1 generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting and allow active ions to pass through at the same time.

[0055] 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.

[0056] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0057] 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 the metal foil, pure metals, alloys, and metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery positive electrode active material can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate can include but not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon.

[0059] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0060] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0062] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0063] As an example, the negative electrode active material can be the negative electrode active material for battery cell 1 well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of battery cell 1 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0064] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0065] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0066] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0067] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transporting ions and isolating the positive and negative electrodes.

[0068] In some embodiments, battery cell 1 further includes an electrolyte, and the electrolyte plays a role of conducting ions between the positive and negative electrodes. The present application has no specific limitation on the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0069] Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0070] In some embodiments, the electrolyte salts can be selected from 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 difluorooxalate borate, lithium bis(oxalato)borate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0071] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0072] In some embodiments, the electrolyte may optionally further include additives. For example, the additives may include negative electrode film-forming additives, or may include positive electrode film-forming additives, or may also include additives that can improve certain properties of the battery cell 1, such as additives for improving the overcharge / fast charge performance of the battery cell 1, additives for improving the high-temperature performance of the battery cell 1, additives for improving the low-temperature performance of the battery cell 1, etc.

[0073] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0074] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0075] As an example, the polymer of the polymer solid electrolyte may include polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymers, polyionic liquids, cellulose, etc.

[0076] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0077] The electrode assembly may be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0078] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0079] In some embodiments, the electrode assembly is a stacked structure.

[0080] As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0081] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of folded segments stacked on each other, and a positive electrode sheet is clamped between adjacent folded segments.

[0082] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments stacked on each other.

[0083] As an example, a plurality of separators may be provided and are respectively disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0084] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0085] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0086] In some embodiments, the electrode assembly is provided with electrode tabs, and the electrode tabs can conduct current out of the electrode assembly. The electrode tabs include positive electrode tabs and negative electrode tabs.

[0087] In some embodiments, the battery cell 1 may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a seal bag is further included between the housing and the electrode assembly, and the seal bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the seal bag may be a bag-shaped insulating structure or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0088] As an example, the battery cell 1 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and there is no particular limitation in this application.

[0089] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0090] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collector member. The electrode terminal may be disposed on the end cap or on the housing body.

[0091] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to discharge the internal gas of the battery cell 1.

[0092] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell 1.

[0093] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0094] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0095] The "actuation" mentioned in this application refers to that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The actions generated by the pressure relief mechanism may include but are not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism breaks, is crushed, is torn, or is opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged outward from the actuated part as emissions. In this way, the battery cell 1 can be depressurized and cooled under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0096] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the gas inside the battery cell 1.

[0097] The emissions from the battery cell 1 mentioned in this application include but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0098] The battery device 100 provided in the embodiments of this application includes the battery cell 1 in any one of the embodiments of this application.

[0099] The battery device 100 (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells 1.

[0100] A plurality of battery cells 1 can be connected in series, parallel, or in a hybrid connection through a busbar component. The busbar component is used to realize the electrical connection between at least two battery cells 1.

[0101] Exemplarily, a series-parallel connection means that there are both series and parallel connections among at least two battery cells 1. At least two battery cells 1 can be directly connected in series, parallel, or in a series-parallel combination; of course, it can also be that at least two battery cells 1 are first connected in series, parallel, or in a series-parallel combination to form a module, and then the modules are connected in series, parallel, or in a series-parallel combination to form an integral whole.

[0102] In some embodiments, a battery cell assembly (Battery Cell Assembly) is usually formed by arranging multiple battery cells 1.

[0103] As an example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing multiple battery cells 1 to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 1 with cable ties.

[0104] In some embodiments, the battery device 100 can be a battery pack (battery Pack).

[0105] Please refer to Figure 2 , the battery device 100 can include a box body 3. As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body 3 by fixing the battery module in the box body 3.

[0106] As an example, the battery cell assembly can also be accommodated in the box body 3 by directly fixing multiple battery cells 1 to the box body 3.

[0107] In some embodiments, the box body 3 can be part of the chassis structure of a vehicle. For example, a part of the box body 3 can become at least a part of the floor of the vehicle, or a part of the box body 3 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0108] The embodiments of the present application provide an electrical device, and the electrical device includes the battery device 100 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electrical energy.

[0109] The electrical device includes but is not limited to energy storage devices, mobile phones, tablets, laptop computers, electric toys, electric tools, vehicles, ships, or spacecraft, etc. Among them, the vehicle can include battery-powered vehicles and electric vehicles, the electric toy can include battery-powered vehicle toys and electric vehicle toys, etc., fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0110] The energy storage device includes but is not limited to energy storage containers or energy storage cabinets, etc.

[0111] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as an example of a vehicle 1000 for illustration. The following will be described with reference to the accompanying drawings.

[0112] Figure 1 The structural schematic diagram of the vehicle 1000 provided for 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 an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be arranged at the bottom, the front or the rear 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 the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0113] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0114] In the related art, during the use of the battery device, the temperature of the battery cells in the battery device will rise, and it is necessary to control the temperature of the battery cells. A heat exchange component is used to exchange heat with the battery cells to adjust the temperature of the battery cells. For example, when the battery cells are working and heating up, the heat exchange component absorbs the heat of the battery cells to dissipate heat and cool down the battery cells. When the external ambient temperature is relatively low and it is necessary to heat up the battery cells, the heat exchange component releases heat to the battery cells. The heat exchange component usually uses a rigid aluminum plate, and the surface of the aluminum plate is in contact with the surface of the battery cells. During the use of the battery device, water is used as the heat exchange medium to flow through the above-mentioned aluminum plate, thereby taking away the heat on the battery cells to cool down the battery cells. However, the aluminum plate is prone to being charged, resulting in risks of electric leakage and / or short circuit.

[0115] In view of this, an embodiment of the present application provides a battery device, which includes at least two battery cells and a heat exchange component. The heat exchange component is disposed on the bottom side of the at least two battery cells. The heat exchange component includes at least two heat exchange elements, at least one heat exchange element is set as a flexible element, and at least one heat exchange element is set as a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells; the flexible element is a layered structure and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Wherein, an insulating member is provided between the heat exchange component and the at least two battery cells.

[0116] In the battery device provided by the embodiment of the present application, the heat exchange component is used to exchange heat with the battery cell. By setting the heat exchange component to include a flexible element and a rigid element, the mass of the flexible element is relatively light, which is beneficial to reducing the mass of the heat exchange component and the production cost of the heat exchange component, and is also beneficial to reducing the mass of the battery device. The rigid element can improve the structural strength of the heat exchange component so that the heat exchange component can better carry the battery cell. The flexible element and the rigid element are stacked to form at least one medium flow channel. The rigid element can support the flexible element, which is beneficial to improving the overall structural strength and stability of the heat exchange component and improving the applicability of the heat exchange component. The side of the heat exchange component close to the battery cell is likely to or needs to contact the battery cell. The insulating member is located between the battery cell and the heat exchange component, which can prevent conduction between the battery cell and the heat exchange component, reduce the risk of electric leakage, and improve safety. The flexible element formed by stacking the metal layer and the non-metal layer in sequence has a thin thickness and a small weight, and by forming a medium flow channel between the flexible element and the rigid element, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the internally flowing heat exchange medium, so there is no possibility of corrosion and leakage.

[0117] The following further elaborates on the battery device 100 provided by the embodiment of the present application with reference to the accompanying drawings. Please refer to Figures 2 to 6 , an embodiment of the present application provides a battery device 100, and the battery device 100 includes at least two battery cells 1 and a heat exchange component 2.

[0118] The heat exchange component 2 is disposed on the bottom side X2 of the at least two battery cells 1. The heat exchange component 2 includes at least two heat exchange elements, at least one heat exchange element is set as a flexible element 21, and at least one heat exchange element is set as a rigid element 22. The flexible element 21 and the rigid element 22 are stacked to form a medium flow channel 2a for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells 1; the flexible element 21 is a layered structure, and the flexible element 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Wherein, an insulating member 2100 is provided between the heat exchange component 2 and the at least two battery cells 1.

[0119] The flexibility in the flexible member 21 refers to the material property of the structure. Such a type of property can be the property endowed to the material due to its relatively light mass, or can be the property endowed to the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, elongation at break, etc. of the material. As an example, the material of the flexible member 21 can be selected as a material with a relatively light mass compared to the structures such as conventional aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of the material of the flexible member 21. By setting the heat exchange assembly 2 in the form including the flexible member 21 in the embodiment of the present application, it is beneficial to reduce the weight of the heat exchange assembly 2.

[0120] The rigidity in the rigid member 22 refers to the material property of the structure. Such a type of property can be the property endowed to the material due to its relatively heavy mass, or can be the property endowed to the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, elongation at break, etc. of the material. As an example, the material of the rigid member 22 can be selected as a metal plate similar to conventional aluminum plates and steel plates, or a material of a composite plate structure, etc., and its rigidity can be controlled by the thickness, width, length, and type of the material of the rigid member 22. By setting the heat exchange assembly 2 in the form including the rigid member 22 in the embodiment of the present application, it can play a supporting role for the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 2.

[0121] After the rigid member 22 is manufactured and formed, that is, after the plastic deformation is completed, under normal use conditions, its shape can be basically maintained without change. After the flexible member 21 is manufactured and formed, that is, after the plastic deformation is completed, under normal use conditions, it can undergo elastic deformation, that is to say, its shape can change.

[0122] By setting the heat exchange assembly 2 to include the flexible member 21 and the rigid member 22, while enabling the heat exchange assembly 2 to have a flexible function, it can also enable the heat exchange assembly 2 to have a certain structural strength.

[0123] The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a, which means that the heat exchange assembly 2 forms the medium flow channel 2a between the flexible member 21 and the rigid member 22. In other words, the flexible member 21 constitutes at least part of the side wall of the medium flow channel 2a, and the rigid member 22 also constitutes at least part of the side wall of the medium flow channel 2a. The heat exchange medium circulates in the medium flow channel 2a to achieve heat exchange with the battery cell 1.

[0124] It should be noted that the specific type of the heat exchange medium is not limited herein, as long as it can achieve a heat exchange effect on the battery cell 1. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is taken as a coolant for description.

[0125] It should be noted that the specific number of the medium flow channels 2a is not limited herein. It can be one or multiple.

[0126] The heat exchange assembly 2 includes at least two heat exchange elements, that is to say, the number of the heat exchange elements is multiple.

[0127] At least one heat exchange element is set as the flexible element 21 means that the number of the flexible elements 21 is one or multiple. In the embodiments where multiple heat exchange elements are set as the flexible elements 21, the flexible elements 21 can be the same or different.

[0128] At least one heat exchange element is set as the rigid element 22 means that the number of the rigid elements 22 is one or multiple. In the embodiments where multiple heat exchange elements are set as the rigid elements 22, the rigid elements 22 can be the same or different.

[0129] Exemplarily, the heat exchange assembly 2 includes two heat exchange elements, one of which is the flexible element 21 and the other is the rigid element 22.

[0130] The heat exchange assembly 2 is arranged on the bottom side X2 of at least two battery cells 1, which means that the heat exchange assembly 2 is located on the side of at least two battery cells 1 close to the ground.

[0131] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. Usually, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0132] The insulating member 2100 is arranged between the heat exchange assembly 2 and at least two battery cells 1. Exemplarily, the insulating member 2100 is arranged on the top side X1 of the heat exchange assembly 2.

[0133] The insulating member 2100 is a structure providing insulation function.

[0134] Here, the flexible element 21 includes a metal layer and a non-metal layer, that is, a composite material part composed of the metal layer and the non-metal layer.

[0135] Exemplarily, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0136] Here, the numbers of the metal layer and the non-metal layer are not limited.

[0137] The battery device 100 provided by the embodiment of the present application, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 has a light mass, which is beneficial to reducing the mass of the heat exchange component 2, reducing the production cost of the heat exchange component 2, and is also beneficial to reducing the mass of the battery device 100. The rigid member 22 can enhance the structural strength of the heat exchange component 2, so as to facilitate the heat exchange component 2 to better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. One side of the heat exchange component 2 close to the battery cell 1 is likely to or needs to contact the battery cell 1. The insulating member 2100 is located between the battery cell 1 and the heat exchange component 2, which can prevent conduction between the battery cell 1 and the heat exchange component 2, reduce the risk of electric leakage, and improve safety. The flexible member 21 formed by sequentially laminating a metal layer and a non-metal layer has a thin thickness and a small weight, and by forming a medium flow channel 2a between the flexible member 21 and the rigid member 22, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 2 can be reduced. In addition, the heat exchange component 2 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0138] In some embodiments, please refer to Figure 5 and Figure 6 , the insulating member 2100 is disposed on the top surface of the heat exchange component 2.

[0139] The top surface of the heat exchange component 2 is the surface of the heat exchange component 2 facing the battery cell 1.

[0140] In this embodiment, the insulating member 2100 is disposed on the top surface of the heat exchange component 2. The heat exchange component 2 can provide an installation position for the insulating member 2100, and the insulating member 2100 can better fit the top surface of the battery cell 1 to insulate and isolate the heat exchange component 2 and the battery cell 1.

[0141] In some embodiments, the insulating member 2100 is coated on the top surface of the heat exchange component 2. That is to say, the insulating member 2100 can be a coating structure. Please refer to Figure 5 , Figure 5 where the insulating member 2100 is a coating structure.

[0142] The specific coating method of the insulating member 2100 is not limited. Exemplarily, the coating methods of the insulating member 2100 include but are not limited to spraying, brushing, or rolling, etc.

[0143] The insulating member 2100 includes, but is not limited to, insulating paint. Exemplarily, the insulating paint includes, but is not limited to, epoxy insulating paint, UV-curable insulating paint, and the like. These insulating paints can be attached to the top surface of the heat exchange component 2 by coating.

[0144] In this embodiment, the insulating member 2100 is coated on the top surface of the heat exchange component 2. The insulating member 2100 and the top surface of the heat exchange component 2 can be tightly combined by intermolecular forces, with strong adhesion, which can reduce the risk of the insulating member 2100 falling off from the top surface of the heat exchange component 2.

[0145] In some embodiments, referring to Figure 6 , the insulating member 2100 is bonded to the top surface of the heat exchange component 2.

[0146] The insulating member 2100 can be an independently manufactured film layer structure. The insulating member 2100 can be bonded to the top surface of the heat exchange component 2 through an adhesive layer 2200, where the adhesive layer 2200 can be composed of glue, double-sided tape, or other adhesive substances.

[0147] The insulating member 2100 includes, but is not limited to, insulating film. Exemplarily, the insulating film includes, but is not limited to, PET insulating adhesive film, polyolefin film, and ceramicized silicone rubber insulating film, and the like. These insulating films can be fixed to the top surface of the heat exchange component 2 by bonding.

[0148] In some examples, the insulating member 2100, such as an insulating film, can also be fixed to the top surface of the heat exchange component 2 by hot pressing.

[0149] In this embodiment, the insulating member 2100 can be independently manufactured and then assembled to the top surface of the heat exchange component 2 through an adhesive substance. The assembly steps are simple, the yield rate is high, and the production cost is relatively low.

[0150] In some embodiments, the insulating member 2100 is a layered structure, and the insulating member 2100 can cover all or part of the top surface of the heat exchange component 2.

[0151] The layered structure refers to a structure in which a single layer or multiple layers are spread in a planar or curved surface form, and the multiple layers can be parallel to each other or regularly stacked.

[0152] As an example, the insulating member 2100 can be a single-layer or multi-layer layered structure.

[0153] In the embodiment where the insulating member 2100 is a single-layer layered structure, the insulating member 2100 can be made of non-metallic materials.

[0154] In the embodiment where the insulating member 2100 is a multi-layer layered structure, the insulating member 2100 can adopt a composite structure such as an aluminum-plastic film with insulating properties.

[0155] In some embodiments, please refer to Figures 2 to 6 , the rigid member 22 is connected to the top side X1 of the flexible member 21, the insulating member 2100 is disposed on the top surface of the rigid member 22, and at least two battery cells 1 are connected to the insulating member 2100.

[0156] The manner in which at least two battery cells 1 are connected to the insulating member 2100 is not limited. Exemplarily, the battery cell 1 and the insulating member 2100 can be bonded by a thermally conductive structural adhesive. In this example, since the insulating member 2100 has an insulating function, the requirement for the insulating performance of the thermally conductive structural adhesive is relatively low, which can expand the selection range of the thermally conductive structural adhesive.

[0157] At least two battery cells 1 are connected to the insulating member 2100, and it can be two, three or more battery cells 1 that are connected to the insulating member 2100. Exemplarily, all battery cells 1 are connected to the insulating member 2100.

[0158] In this embodiment, the rigid member 22 provides a supporting force to carry the battery cell 1 and the insulating member 2100, and the insulating member 2100 isolates the rigid member 22 and the battery cell 1, which can prevent the battery cell 1 from conducting electricity with the heat exchange component 2. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, and the flexible member 21 does not contact the battery cell 1, which can prevent the battery cell 1 from squeezing the flexible member 21.

[0159] In some embodiments, please refer to Figures 2 to 4 , the battery device 100 includes a box body 3, at least two battery cells 1 are disposed in the box body 3, and the rigid member 22 is configured as a part of the box body 3.

[0160] The heat exchange component 2 is connected to the box body 3 or the heat exchange component 2 can be a part of the structure of the box body 3. Thus, the box body 3 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0161] As an example, the heat exchange component 2 and the box body 3 can be connected by a non-detachable connection or a detachable connection or the like.

[0162] Unless otherwise specified, in this application, non-detachable connections include but are not limited to welding and / or bonding, etc., and detachable connections include but are not limited to screw connections, bolt connections and / or snap connections, etc.

[0163] As an example, the heat exchange component 2 being a part of the structure of the box body 3 means that the heat exchange component 2 constitutes a part of the side wall of the box body 3. For example, the rigid member 22 can constitute the bottom wall and / or the peripheral side wall of the box body 3, etc.

[0164] In this embodiment, the rigid member 22 is configured as a part of the box body 3. That is to say, the rigid member 22 is used to form the medium flow channel 2a by laminating with the flexible member 21, and the rigid member 22 is also used to constitute the box body 3. Such a design can reduce the number of components of the battery device 100 and is beneficial to reducing the weight of the battery device 100.

[0165] The shape of the box body 3 is not limited. Exemplarily, the box body 3 can be a simple three-dimensional structure such as a single hexahedron, cylinder or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a hexahedron, cylinder or sphere. In one example, the box body 3 can be a cuboid, the length direction and width direction of the box body 3 are both parallel to the horizontal plane, and the length direction of the box body 3 is parallel to the longest side of the cuboid.

[0166] The material of the box body 3 is not limited. Exemplarily, the material of the box body 3 can be a metal material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0167] Exemplarily, the heat exchange component 2 further includes an inlet and an outlet, and both the inlet and the outlet are communicated with the medium flow channel 2a. Here, the inlet and outlet of the heat exchange component 2 are used to connect with the pipelines of a liquid storage device such as the air conditioning system or water tank of the whole vehicle or the electrical device.

[0168] Exemplarily, please refer to Figure 3 , the heat exchange component 2 further includes a connector 23 having an inlet and a connector 23 having an outlet, and the connector 23 is connected to the rigid member 22.

[0169] The material of the connector 23 includes but is not limited to metal or plastic, etc.

[0170] Exemplarily, the connector 23 is brazed to the rigid member 22.

[0171] Exemplarily, the connector 23 is, for example, a water nozzle.

[0172] The principle of the heat exchange component 2 for heat exchanging the battery cell 1 is as follows: the heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium exchanges heat with the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heat exchange of the battery cell 1.

[0173] Here, the heat exchange component 2 for heat exchanging the battery cell 1 can dissipate heat from the battery cell 1 or heat the battery cell 1.

[0174] The principle of the heat exchange component 2 for dissipating heat from the battery cell 1 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, releases the heat, and completes the cooling and heat dissipation of the battery cell 1.

[0175] The principle of the heat exchange component 2 for heating the battery cell 1 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. The heat exchange medium transfers the heat to the battery cell 1 to realize the heating of the battery cell 1. After that, the heat exchange medium flows out through the outlet of the heat exchange component 2 to complete the heating of the battery cell 1.

[0176] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0177] The elongation at break is a percentage index of the elongation amount to the original length when the material is stretched and fractured. It is used to measure the deformation ability that the material can withstand during the stretching process, that is, the elongation at break represents the ductility of the material when it is stressed and stretched.

[0178] The elongation at break of the flexible member 21 is greater than that of the rigid member 22. In other words, when stressed and stretched, the ductility of the flexible member 21 is greater than that of the rigid member 22, which is beneficial to improving the impact resistance, buffering performance and puncture resistance of the heat exchange component 2.

[0179] Exemplarily, at normal temperature and pressure, the elongation at break of the flexible member 21 and the rigid member 22 can be measured by the tensile test method or the drop hammer test method. The measuring instrument can include a universal testing machine.

[0180] In some embodiments, the elongation at break of the flexible member 21 is in the range of 30% to 300%.

[0181] The elongation at break of the flexible member 21 can be any point value among 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any point value between any two of them.

[0182] In this embodiment, by setting the elongation at break of the flexible member 21 to be in the range of 30% to 300%, the flexible member 21 can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0183] In some embodiments, the elongation at break of the rigid member 22 is in the range of 1% to 50%.

[0184] The fracture elongation of the rigid member 22 can be a point value of any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or a point value between any two of them.

[0185] In this embodiment, by setting the fracture elongation of the rigid member 22 to be in the range of 1% to 50%, the rigid member 22 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 2.

[0186] In some embodiments, the elastic modulus of at least a part of the flexible member 21 is less than the elastic modulus of the rigid member 22.

[0187] Here, it can be that the elastic modulus of a part of the flexible member 21 is less than the elastic modulus of the rigid member 22, or it can be that the elastic modulus of all regions of the flexible member 21 is less than the elastic modulus of the rigid member 22.

[0188] In this way, while enabling the heat exchange assembly 2 to have a flexible function, the heat exchange assembly 2 can also have a certain structural strength.

[0189] The elastic modulus describes the magnitude of the unit strain caused by the unit stress when a solid is stressed within a certain range, and it is one of the basic physical quantities of materials. The larger the elastic modulus, the greater the stiffness of the material and the stronger the compressive capacity. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0190] The measurement methods of the elastic modulus of the flexible member 21 and the rigid member 22 can include at least one of the static tensile test method, the dynamic test method, the sound velocity method, the nanoindentation method, and the bending method. The measuring instruments can include a nanoindenter and a universal testing machine.

[0191] Exemplarily, at normal temperature and pressure, the elastic modulus of the flexible member 21 and the rigid member 22 can be measured by the nanoindentation method. The nanoindentation method uses a micro indenter to indent the surface of the flexible member 21, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0192] In some embodiments, please refer to Figures 2 to 5 , the rigid member 22 is integrated into the box body 3, and the flexible member 21 is connected to the bottom side X2 of the rigid member 22.

[0193] Integrating the rigid member 22 into the box body 3 means that the rigid member 22 is connected to the box body 3 or the rigid member 22 forms part of the side wall of the box body 3.

[0194] If the flexible member 21 is connected to the bottom side X2 of the rigid member 22, then the flexible member 21 is located on the side of the rigid member 22 away from the battery cell 1.

[0195] In this embodiment, the flexible member 21 is connected to the bottom side X2 of the rigid member 22, which to a certain extent reduces the risk that the battery cell 1 contacts and presses the flexible member 21. The rigid member 22 has good structural strength, can withstand a relatively large assembly force, and maintains its shape unchanged. Integrating the rigid member 22 into the box body 3 enables the heat exchange assembly 2 to be stably assembled to the box body 3 without substantial damage.

[0196] In some embodiments, the rigid member 22 may have a flat plate structure with flat surfaces on both sides in the thickness direction.

[0197] In this embodiment, the structure of the rigid member 22 is simple and easy to manufacture and form. For example, the rigid member 22 can be formed by processes such as extrusion.

[0198] In some embodiments, referring to Figures 2 to 4 , the box body 3 includes a box main body, the rigid member 22 includes an avoidance area 221 and a main body area 222. The avoidance area 221 surrounds the outer periphery of the main body area 222. Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is within the projection range of the main body area 222. The flexible member 21 and the main body area 222 define a medium flow channel 2a. The avoidance area 221 is connected to the box main body, and the rigid member 22 and the box main body jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity.

[0199] The avoidance area 221 surrounds the outer periphery of the main body area 222. The avoidance area 221 can be generally annular, and the avoidance area 221 surrounds the main body area 222.

[0200] Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is within the projection range of the main body area 222. That is to say, the projection of the flexible member 21 does not overlap with the projection of the avoidance area 221. In other words, the projection of the avoidance area 221 surrounds the projection of the flexible member 21.

[0201] As an example, the insulating member 2100 can cover all the structures on the top surface of the rigid member 22. That is to say, the top surfaces of both the avoidance area 221 and the main body area 222 are covered with the insulating member 2100.

[0202] In this embodiment, the rigid member 22 and the box main body jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity. The rigid member 22 is part of the side wall of the box body 3 and functions to protect the battery cells 1. The size of the flexible member 21 is smaller than that of the rigid member 22. The flexible member 21 is within the range of the main body area 222, and the flexible member 21 and the avoidance area 221 are basically not in contact, thereby reducing the influence on the flexible member 21 during the assembly process of the avoidance area 221 and the box main body.

[0203] In some embodiments, the rigid member 22 may have a flat plate structure with planar surfaces on both sides in the thickness direction. The avoidance area 221 and the main body area 222 of the rigid member 22 can be virtually divided by a dashed line L or a solid line.

[0204] In some cases, the box body 3 and the heat exchange component 2 are connected by welding. Taking friction stir welding as an example, the temperature of friction stir welding is relatively high, which may be much higher than the melting point of the flexible member 21. For example, the melting point of the flexible member 21 may be between 140°C and 180°C, which may cause the high temperature formed during welding to melt the flexible member 21.

[0205] In some embodiments, the avoidance area 221 is welded to the box body.

[0206] As an example, the avoidance area 221 and the box body can be welded by friction stir welding (i.e., FSW, Friction Stir Welding).

[0207] In one example, the width dimension of the avoidance area 221 is between 5 mm and 15 mm, and the dimension of the welding area can be between 3 mm and 8 mm.

[0208] In this embodiment, the avoidance area 221 is welded to the box body. Since the projection of the flexible member 21 is within the projection range of the main body area 222, during the welding process of the avoidance area 221 and the box body, the distance between the welding position and the flexible member 21 is greater than zero, and the welding high temperature will not directly act on the flexible member 21, thereby reducing the risk of local melting of the flexible member 21 during welding.

[0209] It should be noted that the unit "°C" is Celsius.

[0210] In some cases, the box body and the heat exchange component 2 are connected by screws. The high temperature caused by the high-speed rotation of the screws may also melt the flexible member 21.

[0211] In some embodiments, the avoidance area 221 and the box body are connected by fasteners.

[0212] Fasteners include but are not limited to screws or bolts, etc.

[0213] In one example, the width dimension of the avoidance area 221 is between 5 mm and 10 mm.

[0214] As an example, the avoidance area 221 and the box body can be connected by fasteners using the flow drill screw process (Flow Drill Screw, FDS).

[0215] In this embodiment, since the projection of the flexible member 21 is within the projection range of the main body region 222, during the process of fastening and assembling the avoidance region 221 and the box main body, the distance between the fastener and the flexible member 21 is greater than zero, and the high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible member 21, thereby reducing the risk of local melting of the flexible member 21 during the connection through the fastener.

[0216] In some embodiments, the width dimension of the avoidance region 221 is between 5 mm and 15 mm. Preferably, the width dimension of the avoidance region 221 is between 10 mm and 15 mm.

[0217] Exemplarily, the width dimension of the avoidance region 221 is a point value of any one of 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 11 mm, 12 mm, 14 mm, and 15 mm or a point value between any two of them.

[0218] The width dimension of the avoidance region 221 refers to the distance between the boundary line between the avoidance region 221 and the main body region 222 and the edge line of the avoidance region 221.

[0219] In this embodiment, the width dimension of the avoidance region 221 is moderate. There is sufficient space for connecting to the box body 3 to avoid the flexible member 21, and it can also avoid occupying the area of the main body region 222 as much as possible, retaining enough area to form the medium flow channel 2a to meet the heat exchange requirements.

[0220] It should be noted that the unit "mm" is millimeter.

[0221] In some embodiments, the heat exchange assembly 2 is located inside the box body 3. The heat exchange assembly 2 is located inside the box body 3, and the box body 3 can protect the heat exchange assembly 2 and reduce the risk of the heat exchange assembly 2 being impacted.

[0222] In some embodiments, please refer to Figures 2 to 5 , the box body 3 includes a box main body and a bottom guard plate 33. The box main body includes an annular frame 31 and a top cover 32. The annular frame 31 has a top-side opening and a bottom-side opening. The rigid member 22 is connected to the annular frame 31 and closes the bottom-side opening; the top cover 32 closes the top-side opening of the annular frame 31; the top cover 32, the annular frame 31, and the rigid member 22 jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity; the bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 is connected to the annular frame 31.

[0223] As an example, the rigid member 22 can be welded to the annular frame 31 or connected by fasteners.

[0224] The annular frame 31 can be generally in the shape of a square ring, a rectangular ring or an annular shape of other shapes. In some embodiments, the annular frame 31 can include four side plates, and the side plates can be extruded plate-shaped profiles. The four side plates are welded in sequence along the circumferential direction to form the annular frame 31.

[0225] The accommodating cavity can be a sealed space or a non-sealed space.

[0226] The top cover 32 can be welded to the annular frame 31 or connected by fasteners.

[0227] The bottom guard plate 33 can be welded to the annular frame 31 or connected by fasteners.

[0228] In this embodiment, the annular frame 31 and the top cover 32 can be separately manufactured and then assembled into the box body. The rigid member 22 and the box body jointly define the accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity. The rigid member 22 is part of the side wall of the box body 3 and plays a role in protecting the battery cells 1. The bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 can protect the flexible member 21 to prevent objects outside the box body 3 from contacting the flexible member 21.

[0229] In some embodiments, the box body 3 includes a box main body, the box main body is open towards the bottom side, and the heat exchange component 2 closes the bottom side opening of the box main body to jointly define the accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity.

[0230] As an example, a bottom guard plate 33 can be provided on the bottom side X2 of the heat exchange component 2, and the bottom guard plate 33 is connected to the box main body. In this way, the bottom guard plate 33 can protect the flexible member 21.

[0231] In this embodiment, the heat exchange component 2 closes the bottom side opening of the box main body, and the heat exchange component 2 serves as the bottom wall of the box body 3, which can reduce the overall package weight of the battery device 100.

[0232] In some embodiments, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot-pressed area and a medium flow channel 2a, and the flexible member 21 and the rigid member 22 are connected to each other in at least part of the hot-pressed area.

[0233] That is to say, the flexible member 21 and the rigid member 22 are connected by hot pressing, and a hot-pressed area and a medium flow channel 2a are formed by hot pressing, and this forming method is simple.

[0234] Here, the flexible member 21 is sealed by a hot pressing process. Through the hot pressing process, the sealing performance of the heat exchange component 2 can be effectively guaranteed and it is not easy to crack.

[0235] In this embodiment, the flexible member 21 is sealed by a hot pressing process, that is, a hot-pressed area is formed by hot pressing, and the heat exchange component 2 is separated by the hot-pressed area to form at least one medium flow channel 2a, and this forming method is simple.

[0236] Exemplarily, the hot pressing area includes a heat-sealing area and a non-heat-sealing area. The non-heat-sealing area and the medium flow channel 2a are respectively located on both sides of the heat-sealing area, which is beneficial to reducing the width of the heat-sealing area and improving the problem of excessive temperature caused by the over-wide heat-sealing area, affecting the hot pressing quality and damaging the flexible member 21. In addition, the non-heat-sealing area can also form a buffer area for stress release when the flexible member 21 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causing damage to the heat-sealing area.

[0237] In the related art, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. However, for high-strength aluminum alloy (such as 5 series, 6 series, etc.), due to the relatively high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0238] In the embodiment of the present application, by setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot pressing area and a medium flow channel 2a. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improving the structural strength of the heat exchange component 2.

[0239] In some embodiments, the flexible member 21 is in the form of a single-layer or multi-layer thin film.

[0240] In some embodiments, the flexible member 21 includes a metal-plastic film.

[0241] Here, the metal-plastic film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0242] In this embodiment, since the metal-plastic film is thin and light in weight, and by forming a medium flow channel 2a between the metal-plastic film and the rigid member 22, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 2 can be reduced. At the same time, since the metal-plastic film has the characteristics of insulation and anti-corrosion of the heat exchange medium, the possibility of insulation failure can be reduced, and the risk of reaction between the heat exchange component 2 and the heat exchange medium flowing inside can also be reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0243] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0244] In this embodiment, the flexible member 21 uses an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the requirements of insulation and anti-corrosion.

[0245] In some embodiments, the flexible member 21 is a layered structure. The flexible member 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Among them, the non-metal layer is disposed on the side of the metal layer facing the rigid member 22.

[0246] That is to say, the non-metal layer is located between the metal layer and the rigid member 22.

[0247] Here, by disposing the non-metal layer on the side of the metal layer facing the rigid member 22, thermal pressing connection can be achieved between the non-metal layer and the rigid member 22.

[0248] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0249] In this embodiment, by setting the metal layer as one or more of aluminum foil, copper foil, and steel foil, the flexible member 21 can have a certain structural strength and can play an isolation role.

[0250] In some embodiments, the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0251] In this embodiment, by setting the non-metal layer as one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member 21 can have a certain waterproof function and / or the performance of being resistant to corrosion by heat exchange media.

[0252] Exemplarily, a non-metal layer made of a corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or in other words, additives are added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0253] In some embodiments, the non-metal layer is a hot melt layer.

[0254] In this embodiment, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to make the non-metal layer and the metal layer composite together through hot melting, with simple molding and high production efficiency.

[0255] In some embodiments, the thickness of the flexible member 21 is 0.05 mm - 0.3 mm.

[0256] Exemplarily, the thickness of the flexible member 21 is any point value among 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm or any point value between any two of them.

[0257] In this embodiment, by setting the thickness of the flexible member 21 to 0.05 mm - 0.3 mm, while the heat exchange component 2 made of the flexible member 21 has a certain structural strength, the overall thickness of the heat exchange component 2 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0258] In some embodiments, the thickness of the flexible member 21 is 0.08 mm - 0.2 mm.

[0259] Exemplarily, the thickness of the flexible member 21 is a point value of any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or a point value between any two of them.

[0260] In this embodiment, by setting the thickness of the flexible member 21 to 0.08 mm - 0.2 mm, while the heat exchange assembly 2 made of the flexible member 21 has a certain structural strength, further, the overall thickness of the heat exchange assembly 2 is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0261] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa - 10,000 MPa.

[0262] Exemplarily, the elastic modulus of the flexible member 21 can be a point value of any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, 10,000 MPa or a point value between any two of them.

[0263] In this embodiment, by setting the elastic modulus of the flexible member 21 to 0.1 MPa - 10,000 MPa, not only does the flexible member 21 have a certain structural strength, improving the reliability of the heat exchange assembly 2, but also it has a certain deformation ability, which can enhance the fitting degree between the heat exchange assembly 2 and the box body 3 and / or the battery cell 1, thereby increasing the effective heat exchange area between the heat exchange assembly 2 and the box body 3 and / or the battery cell 1, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 2.

[0264] In some embodiments, the rigid member 22 is set as a metal plate.

[0265] Exemplarily, for example, it can be aluminum alloy.

[0266] In this embodiment, by setting the rigid member 22 as a metal plate, the metal plate has both good structural strength and good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange assembly 2, the rigid member 22 can also play a certain supporting role for the flexible member 21.

[0267] In some embodiments, the medium flow channel 2a includes a plurality of sub-flow channels. Each battery cell 1 corresponds to a plurality of sub-flow channels, and the extending direction of the sub-flow channels corresponding to the battery cell 1 is perpendicular to the length direction of the battery cell 1.

[0268] The plurality of sub-flow channels are communicated to form the medium flow channel 2a.

[0269] The extending direction of the sub-flow channels is perpendicular to the length direction of the battery cell 1. That is to say, the plurality of sub-flow channels are arranged along the length direction of the battery cell 1. In this way, the length direction of the battery cell 1 can correspond to a plurality of sub-flow channels.

[0270] It can be understood that along the flowing direction of the heat exchange medium, the temperature of the heat exchange medium will gradually increase. Therefore, by making each battery cell 1 correspond to a plurality of sub-flow channels, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0271] The following further illustrates the battery device 100 provided by the embodiments of the present application with a specific embodiment. Please refer to Figures 2 to 5 , the battery device 100 includes at least two battery cells 1, a heat exchange assembly 2 and a box body 3. The heat exchange assembly 2 is arranged on the bottom side X2 of at least two battery cells 1. The heat exchange assembly 2 includes at least two heat exchange members. At least one heat exchange member is set as a flexible member 21, and at least one heat exchange member is set as a rigid member 22. The flexible member 21 and the rigid member 22 are stacked to form a medium flow channel 2a. The medium flow channel 2a is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1. The rigid member 22 is connected to the top side X1 of the flexible member 21. An insulating member 2100 is arranged on the top surface of the rigid member 22. At least two battery cells 1 are connected to the insulating member 2100. At least two battery cells 1 are arranged in the box body 3, and the heat exchange assembly 2 is integrated into the box body 3.

[0272] In this embodiment, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component 2 and the production cost of the heat exchange component 2, and is also beneficial to reducing the mass of the battery device 100. The rigid member 22 can enhance the structural strength of the heat exchange component 2, so that the heat exchange component 2 can better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and enhancing the applicability of the heat exchange component 2. One side of the heat exchange component 2 close to the battery cell 1 is likely to or needs to contact the battery cell 1. The insulating member 2100 is located between the battery cell 1 and the heat exchange component 2, which can prevent conduction between the battery cell 1 and the heat exchange component 2, reduce the risk of electric leakage, and enhance safety. The rigid member 22 provides a supporting force to carry the battery cell 1 and the insulating member 2100. The insulating member 2100 isolates the rigid member 22 and the battery cell 1, which can avoid conduction between the battery cell 1 and the heat exchange component 2. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, and the flexible member 21 does not contact the battery cell 1, which can avoid the battery cell 1 squeezing the flexible member 21. The heat exchange component 2 is integrated into the box body 3. The heat exchange component 2 is connected to the box body 3 or the heat exchange component 2 can be a part of the structure of the box body 3. The box body 3 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0273] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that, Comprising: At least two battery cells; A heat exchange assembly disposed on the bottom side of the at least two battery cells. The heat exchange assembly includes at least two heat exchange elements, at least one of the heat exchange elements is configured as a flexible member, and at least one of the heat exchange elements is configured as a rigid member. The flexible member and the rigid member are stacked to form a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with the at least two battery cells. The flexible member is a layered structure and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence; Wherein, an insulating member is disposed between the heat exchange assembly and the at least two battery cells.

2. The battery device according to claim 1, wherein The insulating member is disposed on the top surface of the heat exchange assembly.

3. The battery device according to claim 2, characterized in that, The insulating member is coated or adhered to the top surface of the heat exchange assembly.

4. The battery device according to claim 1, characterized in that, The rigid member is connected to the top side of the flexible member, the insulating member is disposed on the top surface of the rigid member, and the at least two battery cells are connected to the insulating member.

5. The battery device according to claim 1, characterized in that, The battery device includes a box body, the at least two battery cells are disposed in the box body, and the rigid member is configured as a part of the box body.

6. The battery device according to claim 5, characterized in that, The box body includes a box main body, the rigid member includes an avoidance area and a main body area. The avoidance area surrounds the outer periphery of the main body area. Taking a plane perpendicular to the top-bottom direction as a projection plane, the projection of the flexible member is located within the projection range of the main body area. The flexible member and the main body area define the medium flow channel. The avoidance area is connected to the box main body, and the rigid member and the box main body jointly define a receiving cavity, and the at least two battery cells are located in the receiving cavity.

7. The battery device according to any one of claims 1 to 6, characterized in that, The flexible member includes a metal plastic film.

8. The battery device according to claim 7, characterized in that, The flexible member includes an aluminum plastic film.

9. The battery device according to claim 1, wherein, The metal layer includes one of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

10. The battery device according to claim 9, characterized in that, The non-metal layer is a heat-melt layer.

11. The battery device according to any one of claims 1 to 6, characterized in that, The thickness of the flexible member is 0.05 mm - 0.3 mm.

12. The battery device according to claim 11, wherein, The thickness of the flexible member is 0.08 mm - 0.2 mm.

13. The battery device according to any one of claims 1 to 6, characterized in that, The elastic modulus of the flexible member is 0.1 MPa - 10000 MPa.

14. The battery device according to any one of claims 1 to 6, characterized in that, The rigid member is configured as a metal plate.

15. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 14.

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