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 a box body, at least two battery monomers and a heat exchange assembly, the box body has a top cover; the at least two single batteries are positioned in the box body; the heat exchange assembly is arranged on the top sides of the at least two battery monomers, the heat exchange assembly comprises at least two heat exchange pieces, at least one heat exchange piece is a flexible piece, at least one heat exchange piece is a rigid piece, the flexible piece and the rigid piece are stacked to form a medium flow channel, the medium flow channel is used for conducting a heat exchange medium, and the heat exchange piece is arranged in the medium flow channel. The heat exchange medium is used for exchanging heat with the at least two single batteries. Wherein the heat exchange assembly is integrated to the top cover. The heat exchange assembly is integrated to the top cover, the heat exchange assembly is connected with the top cover or the heat exchange assembly can be a part of the structure of the top cover, the top cover can support the heat exchange assembly, and the overall structural strength and stability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery device and an electrical appliance. Background Technology

[0002] Battery devices can be used to store or provide electrical energy, and they can be used in electrical equipment, such as vehicles.

[0003] In related technologies, taking vehicles as an example, in vehicles equipped with battery devices, the battery devices can provide all or part of the power. During use, the temperature of the individual battery cells in the battery device will rise, requiring temperature control; otherwise, it can adversely affect the performance and lifespan of the battery device. Therefore, how to regulate the temperature of individual battery cells through heat exchange components has become an important research direction in this field. Utility Model Content

[0004] In view of this, embodiments of this application aim to provide a battery device and an electrical appliance, wherein the top cover can provide support for the heat exchange components, which is beneficial to improving the overall structural strength and stability of the battery device.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] This application provides a battery device, including:

[0007] The box has a top cover;

[0008] At least two battery cells are located inside the housing;

[0009] A heat exchange assembly is disposed on the top side of the at least two battery cells. The heat exchange assembly includes at least two heat exchange elements, at least one of which is a flexible element and at least one of which is a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel. The medium flow channel is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells.

[0010] The heat exchange component is integrated into the top cover.

[0011] The battery device provided in this application includes a heat exchange component for heat exchange with individual battery cells. By comprising flexible and rigid components, the lightweight flexible component reduces the overall weight and production cost of the heat exchange component, and consequently, the weight of the battery device. The rigid component enhances the structural strength of the heat exchange component, allowing it to better support the battery cells. The flexible and rigid components are stacked to form at least one medium flow channel. The rigid component supports the flexible component, improving the overall structural strength and stability of the heat exchange component and enhancing its applicability. Since the top side of each battery cell has a relatively higher temperature, the heat exchange component is positioned on the top side of at least two battery cells. This proximity to the higher-temperature areas of the battery cells allows for faster cooling of these areas, reducing the temperature in the high-temperature regions and improving heat exchange efficiency. This addresses the issue of large temperature differences between the top and bottom of the battery cells to some extent. The heat exchange component is integrated into a top cover, either connected to it or forming part of the top cover structure. The top cover provides support for the heat exchange component, further enhancing the overall structural strength and stability of the battery device.

[0012] In some embodiments, the rigid member is configured as the top cover or the rigid member is disposed on the bottom side of the top cover.

[0013] In this embodiment, the rigid component is configured as a top cover. As part of the housing, the rigid component saves on structural elements, reduces costs, and decreases the overall weight of the battery pack. The rigid component is located on the bottom side of the top cover, allowing the heat exchange assembly to be entirely housed within the housing. The top cover conceals the rigid component, thus better protecting the heat exchange assembly.

[0014] In some embodiments, the flexible element is located on the bottom side of the rigid element, and the flexible element abuts against or is connected to the battery cell through a thermally conductive structure.

[0015] In this embodiment, the flexible component abuts against the battery cell, allowing for better fit and increased heat exchange area. The flexible component and battery cell are connected via a thermally conductive structure with excellent thermal conductivity. This structure establishes a heat conduction path between the flexible component and the battery cell, improving heat exchange efficiency.

[0016] In some embodiments, the battery device includes an insulation element disposed on the side of the heat exchange assembly away from the at least two battery cells.

[0017] In this embodiment, the side of the heat exchange component facing the battery cell is used for heat exchange with the battery cell, and the side of the heat exchange component away from the battery cell is provided with an insulation component. The insulation component can better isolate the heat exchange component from the environment, increase the thermal resistance of the heat exchange component, thereby reducing the heat exchange between the heat exchange component and the environment, reducing the heat diffusion of the heat exchange component to the environment, and improving the heat insulation performance of the heat exchange component.

[0018] In some embodiments, the insulation element is attached to the top surface of the heat exchange assembly.

[0019] In this embodiment, the insulation component is attached to the top surface of the heat exchange component, so there is no gap between the insulation component and the heat exchange component. The heat exchange component can support the insulation component, and the assembly between the insulation component and the heat exchange component is stable, simple in process, and easy to manufacture.

[0020] In some embodiments, at least a portion of the insulation element is spaced apart from the top surface of the heat exchange assembly to form an insulation cavity, the insulation cavity being filled with air.

[0021] In this embodiment, the insulation cavity provides thermal insulation. When the flexible component is impacted, the insulation cavity can absorb energy through deformation, thus mitigating the impact. Air has a very low thermal conductivity, and the air layer formed between the heat exchange component and the insulation component can better prevent heat loss from the heat exchange component to the environment, thereby improving the thermal insulation performance of the heat exchange component.

[0022] In some embodiments, at least a portion of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer.

[0023] In this embodiment, at least a portion of the surface of at least one of the flexible and rigid components has an anti-corrosion layer. The anti-corrosion layer provides anti-corrosion function, improves the anti-corrosion performance of the heat exchange component, and enhances the heat exchange component's tolerance to corrosive substances such as heat exchange medium and substances in the environment, thereby improving the reliability of the heat exchange component.

[0024] In some embodiments, at least a portion of the surface of the rigid member constituting the medium flow channel is covered with the anti-corrosion layer.

[0025] In this embodiment, at least a portion of the surface of the rigid component forming the medium flow channel is covered with an anti-corrosion layer, which improves the situation where the heat exchange medium damages the rigid component and helps to improve the reliability of the heat exchange assembly.

[0026] In some embodiments, the entire surface of the rigid member facing the flexible member is covered with the anti-corrosion layer.

[0027] In this embodiment, all surfaces of the rigid component facing the flexible component are covered with an anti-corrosion layer, which can reduce the manufacturing difficulty of the anti-corrosion layer.

[0028] In some embodiments, the flexible element has a layered structure, comprising a metal layer and two anti-corrosion layers, wherein the metal layer is stacked between the two anti-corrosion layers.

[0029] In this embodiment, the flexible component can be provided with plasticity through the metal layer, allowing it to maintain its basic shape. The metal layer is stacked between two anti-corrosion layers, which can encapsulate the metal layer, preventing it from contacting the heat exchange medium and corrosive substances in the environment, thereby improving the corrosion resistance of the flexible component.

[0030] In some embodiments, the battery device includes an insulating element, the terminal of the battery cell is disposed on a side close to the heat exchange assembly in a first direction, and the insulating element is disposed between the heat exchange assembly and the at least two battery cells.

[0031] In this embodiment, the side of the heat exchange component closer to the battery cell can easily or needs to contact the battery cell. However, the battery cell's terminal is close to the heat exchange component and is charged. The insulating component is located between the battery cell and the heat exchange component, which can prevent electrical conduction between the battery cell and the heat exchange component and improve safety.

[0032] In some embodiments, the insulating element is disposed on the bottom surface of the heat exchange assembly.

[0033] In this embodiment, the insulating element is disposed on the bottom surface of the heat exchange assembly. The heat exchange assembly can provide an installation position for the insulating element, which can better fit the top surface of the battery cell to insulate and isolate the heat exchange assembly and the battery cell.

[0034] In some embodiments, the flexible element includes a metallized film.

[0035] In this embodiment, because the metal plasticized film is thin and lightweight, and because it forms a medium flow channel between the metal plasticized film and the rigid component, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly can be reduced. Simultaneously, because the metal plasticized film has insulating and anti-corrosion properties against the heat exchange medium, the possibility of insulation failure can be reduced, as well as the risk of the heat exchange assembly reacting with the internally flowing heat exchange medium, further reducing the possibility of heat exchange medium corrosion leakage.

[0036] In some embodiments, the flexible element comprises an aluminum-plastic film.

[0037] In this embodiment, the flexible component is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, thus meeting the requirements for insulation and corrosion prevention.

[0038] In some embodiments, the flexible element is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked sequentially.

[0039] In this embodiment, the flexible component, composed of sequentially stacked metal and non-metal layers, is thin and lightweight. Furthermore, by forming a media flow channel between the flexible and rigid components, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly. In addition, the heat exchange assembly does not react with the internally flowing heat exchange medium, therefore eliminating the possibility of corrosion and leakage.

[0040] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or,

[0041] The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0042] In this embodiment, by using one or more of aluminum foil, copper foil, and steel foil as the metal layer, the flexible component can have a certain structural strength and can play an isolation role. By using one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene as the non-metallic layer, the flexible component can have a certain waterproof function and / or resistance to heat exchange medium corrosion.

[0043] In some embodiments, the non-metallic layer is a hot-melt layer.

[0044] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer together through hot melting, which is simple to form and has high production efficiency.

[0045] In some embodiments, the thickness of the flexible element is 0.05mm-1mm.

[0046] In this embodiment, by setting the thickness of the flexible component to 0.05mm-1mm, the heat exchange component made of the flexible component has a certain structural strength while making the overall thickness of the heat exchange component small, which is beneficial to reduce the overall volume and weight of the battery device and increase the energy density of the battery device.

[0047] In some embodiments, the thickness of the flexible element is 0.08 mm to 0.2 mm.

[0048] In this embodiment, by setting the thickness of the flexible component to 0.08mm-0.2mm, the heat exchange assembly made of the flexible component has a certain structural strength, while further reducing the overall thickness of the heat exchange assembly. This is beneficial to further reduce the overall volume and weight of the battery device, thereby further increasing the energy density of the battery device.

[0049] In some embodiments, the elastic modulus of the flexible element is 0.1 MPa-10000 MPa.

[0050] In this embodiment, by setting the elastic modulus of the flexible component to 0.1MPa-10000MPa, the flexible component has a certain structural strength, which improves the reliability of the heat exchange assembly, and also has a certain deformation capacity. This can improve the fit between the heat exchange assembly and the housing and / or battery cells, thereby increasing the effective heat exchange area between the heat exchange assembly and the housing and / or battery cells, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0051] In some embodiments, the rigid member is a metal plate.

[0052] In this embodiment, by setting the rigid component as a metal plate, the metal plate has both good structural strength and good thermal conductivity. In other words, while ensuring that the heat exchange component has a certain heat exchange efficiency, the rigid component can also provide some support for the flexible component.

[0053] In some embodiments, the elongation at break of the flexible element is greater than that of the rigid element.

[0054] In this embodiment, when subjected to tensile stress, the elongation performance of the flexible component is greater than that of the rigid component, which is beneficial to improving the impact resistance, buffering performance and puncture resistance of the heat exchange assembly.

[0055] In some embodiments, the elongation at break of the flexible element is in the range of 30% to 300%; and / or,

[0056] The elongation at break of the rigid component is in the range of 1% to 50%.

[0057] In this embodiment, by setting the elongation at break of the flexible component to a range of 30% to 300%, the flexible component can possess both impact resistance and puncture resistance, as well as structural strength. By setting the elongation at break of the rigid component to a range of 1% to 50%, the rigid component can possess sufficient structural strength, thereby improving the overall structural strength of the heat exchange assembly.

[0058] In some embodiments, the elastic modulus of at least a portion of the flexible element is less than that of the rigid element.

[0059] In this embodiment, while enabling the heat exchange component to have flexible functionality, it can also enable the heat exchange component to have a certain structural strength.

[0060] In some embodiments, the flexible element is thermo-pressed or bonded to the rigid element.

[0061] In this embodiment, the temperature of hot pressing is lower than that of welding and other connection methods, and the bonding does not generate high temperature, which can avoid the impact of high temperature on flexible parts during assembly.

[0062] This application also provides an electrical device including any of the battery devices described above. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0064] Figure 2 This is a schematic diagram of the structure of a single battery cell in some embodiments of this application;

[0065] Figure 3 This is an exploded view of a battery device in some embodiments of this application, wherein the rigid member is configured as a top cover;

[0066] Figure 4 for Figure 3 An exploded schematic diagram of the heat exchange components of the battery device;

[0067] Figure 5 for Figure 4 Exploded view of the heat exchange components;

[0068] Figure 6 This is an exploded view of a battery device in some other embodiments of this application, wherein a rigid member is disposed on the bottom side of the top cover;

[0069] Figure 7 for Figure 6 An exploded schematic diagram of the heat exchange components of the battery device;

[0070] Figure 8 This is an exploded view of the flexible component in some embodiments of this application;

[0071] Figure 9 This is an exploded view of a heat exchange component in some embodiments of this application, wherein the rigid component is configured as a top cover;

[0072] Figure 10 This is an exploded view of a battery device in some embodiments of this application, wherein the rigid member is configured as a top cover;

[0073] Figure 11 This is an exploded view of a battery device in some embodiments of this application, wherein the rigid member is configured as a top cover.

[0074] Explanation of reference numerals in the attached figures

[0075] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1, Battery Cell; 11, Terminal; 2, Heat Exchange Component; 2a, Medium Flow Channel; 21, Flexible Component; 211, Metal Layer; 212, Non-metallic Layer; 22, Rigid Component; 201, Anti-corrosion Layer; 23, Connector; 3, Housing; 31, Top Cover; 32, Annular Frame; 33, Bottom Protective Plate; 34, Housing Body; 4, Thermal Insulation Component; 5, Insulating Component. Detailed Implementation

[0076] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0078] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] It should be noted that in this application, "at least two" refers to a quantity of two or more. "Multiple" refers to a quantity of two or more.

[0080] Please see Figures 1 to 3 To facilitate understanding of the battery device 100 and electrical equipment provided in the embodiments of this application, some basic structures of the battery cell 1, battery device 100 and electrical equipment provided in the embodiments of this application will be introduced first.

[0081] In this embodiment of the application, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0082] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0083] A single battery cell 1 typically includes an electrode assembly, which comprises a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the single battery cell 1, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the electrodes while allowing active ions to pass through.

[0084] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0085] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0086] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0088] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0089] 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 a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0091] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0092] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 1. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0093] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0094] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0095] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator 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 it 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 applied to the surface of the separator.

[0096] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0097] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0098] Liquid electrolytes include electrolyte salts and solvents.

[0099] In some embodiments, the electrolyte salt may 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 dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0100] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl 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. Ether solvents 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, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0101] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain performance of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high-temperature performance of the battery cell 1, additives that improve the low-temperature performance of the battery cell 1, etc.

[0102] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0103] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0104] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0105] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0106] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0107] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0108] In some implementations, the electrode assembly is a stacked structure.

[0109] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0110] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0111] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0112] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0113] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0114] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0115] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0116] In some embodiments, the battery cell 1 may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly for encapsulating the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component 5 or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0117] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. This application does not have any particular limitations.

[0118] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0119] In some embodiments, at least one terminal post is provided on the housing, and the terminal post is electrically connected to the tab. The terminal post can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The terminal post can be provided on the end cap or on the housing.

[0120] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to release the internal gas of the battery cell 1.

[0121] As an example, when the internal pressure or temperature of battery cell 1 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of battery cell 1 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in battery cell 1.

[0122] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0123] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0124] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 1. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 1 are discharged outwards from the actuated portion as waste. This method enables the battery cell 1 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0125] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 1.

[0126] The emissions from battery cell 1 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0127] The battery device 100 provided in this application includes the battery cell 1 in any one embodiment of this application.

[0128] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 1.

[0129] Multiple battery cells 1 can be connected in series, parallel, or mixed via a busbar. The busbar is used to achieve electrical connection between at least two battery cells 1.

[0130] For example, "hybrid connection" refers to at least two battery cells 1 that are connected in both series and parallel. At least two battery cells 1 can be directly connected in series, parallel, or hybrid connections; of course, at least two battery cells 1 can also be first connected in series, parallel, or hybrid connections to form a module, and then the module can be connected in series, parallel, or hybrid connections to form a whole.

[0131] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 1.

[0132] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 1 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0133] In some embodiments, the battery device 100 may be a battery pack.

[0134] Please see Figure 3 The battery device 100 may include a housing 3. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be housed in the housing 3 by fixing the battery module in the housing 3.

[0135] As an example, the battery cell assembly can also be housed in the housing 3 by directly fixing multiple battery cells 1 to the housing 3.

[0136] In some embodiments, the housing 3 can be part of the vehicle's chassis structure. For example, a portion of the housing 3 can be at least a part of the vehicle's floor, or a portion of the housing 3 can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0137] This application provides an electrical device, which includes a battery device 100 as described in any embodiment of this application. The battery device 100 is used to store or provide electrical energy.

[0138] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, vehicles, ships, or spacecraft. Vehicles can include electric bicycles and electric cars; electric toys can include electric bicycle toys and electric car toys, etc., including stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0139] Energy storage devices include, but are not limited to, energy storage containers or energy storage cabinets.

[0140] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows, with reference to the accompanying drawings.

[0141] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0142] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0143] In related technologies, during the use of a battery device, the temperature of the individual battery cells rises, requiring temperature control. Heat exchange components are used to exchange heat with the individual cells to regulate their temperature. For example, when a battery cell heats up during operation, the heat exchange component absorbs the heat to cool it down. When the ambient temperature is low and heating is required, the heat exchange component releases heat to the battery cell. In some cases, the battery cell's terminals face upwards. During operation, the temperature near the terminals is higher than other parts of the cell. Since the heat exchange component is located on the bottom of the cell, due to thermal resistance, it cannot effectively cool the top of the cell, resulting in a temperature gradient along the top-to-bottom direction, which affects the use of the battery device.

[0144] In view of this, embodiments of this application provide a battery device, which includes a housing, at least two battery cells, and a heat exchange assembly. The housing has a top cover; at least two battery cells are located inside the housing; the heat exchange assembly is disposed on the top side of the at least two battery cells, and the heat exchange assembly includes at least two heat exchange elements, at least one of which is a flexible element and at least one of which is a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel, which is used to conduct heat exchange medium for exchanging heat with the at least two battery cells. The heat exchange assembly is integrated into the top cover.

[0145] The battery device provided in this application includes a heat exchange component for heat exchange with individual battery cells. By comprising flexible and rigid components, the lightweight flexible component reduces the overall weight and production cost of the heat exchange component, and consequently, the weight of the battery device. The rigid component enhances the structural strength of the heat exchange component, allowing it to better support the battery cells. The flexible and rigid components are stacked to form at least one medium flow channel. The rigid component supports the flexible component, improving the overall structural strength and stability of the heat exchange component and enhancing its applicability. Since the top side of each battery cell has a relatively higher temperature, the heat exchange component is positioned on the top side of at least two battery cells. This proximity to the higher-temperature areas of the battery cells allows for faster cooling of these areas, reducing the temperature in the high-temperature regions and improving heat exchange efficiency. This addresses the issue of large temperature differences between the top and bottom of the battery cells to some extent. The heat exchange component is integrated into a top cover, either connected to it or forming part of the top cover structure. The top cover provides support for the heat exchange component, further enhancing the overall structural strength and stability of the battery device.

[0146] The battery device 100 provided in the embodiments of this application is further described below with reference to the accompanying drawings. Please refer to the accompanying drawings. Figures 3 to 10 This application provides a battery device 100, which includes a housing 3, at least two battery cells 1 and a heat exchange assembly 2.

[0147] The housing 3 has a top cover 31; at least two battery cells 1 are located inside the housing 3; a heat exchange assembly 2 is disposed on the top side X1 of the at least two battery cells 1, the heat exchange assembly 2 includes at least two heat exchange elements, at least one heat exchange element is configured as a flexible element 21, and at least one heat exchange element is configured as a rigid element 22, the flexible element 21 and the rigid element 22 are stacked to form a medium flow channel 2a, the medium flow channel 2a is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells 1. The heat exchange assembly 2 is integrated into the top cover 31.

[0148] The housing 3 can be used to hold the battery cell 1 and other structural components, providing protection for the battery cell 1 and other structural components, and reducing the impact of foreign objects outside the housing 3 on the charging or discharging of the battery cell 1.

[0149] The flexibility in flexible component 21 refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, elastic modulus, and elongation at break. As an example, the material of flexible component 21 can be selected as a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of flexible component 21. In this embodiment of the application, by setting the heat exchange assembly 2 to include flexible component 21, it is beneficial to reduce the weight of heat exchange assembly 2.

[0150] The rigidity in rigid component 22 refers to the material properties of the structure. This type of property can be due to the material's weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, elastic modulus, and elongation at break. As an example, the material of rigid component 22 can be a conventional metal plate such as aluminum plate or steel plate, or a composite material, and its rigidity can be controlled by the thickness, width, length, and type of material of rigid component 22. In this embodiment, by setting the heat exchange assembly 2 to include rigid component 22, it can support the flexible component 21, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 2.

[0151] After the rigid component 22 is manufactured and plastically deformed, it can maintain its shape essentially without change under normal use. After the flexible component 21 is manufactured and plastically deformed, it can undergo elastic deformation under normal use, that is, it can change its shape.

[0152] By configuring the heat exchange component 2 to include a flexible component 21 and a rigid component 22, the heat exchange component 2 can have a flexible function while also having a certain structural strength.

[0153] The flexible element 21 and the rigid element 22 are stacked to form a medium flow channel 2a. This means that the heat exchange assembly 2 forms a medium flow channel 2a between the flexible element 21 and the rigid element 22. In other words, the flexible element 21 constitutes at least a portion of the sidewall of the medium flow channel 2a, and the rigid element 22 also constitutes at least a portion of the sidewall of the medium flow channel 2a. The heat exchange medium flows within the medium flow channel 2a to achieve heat exchange with the battery cell 1.

[0154] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a heat exchange effect on the battery cell 1, such as being gaseous or liquid. In this embodiment, a coolant is used as an example for description.

[0155] It should be noted that the specific number of medium flow channels 2a is not limited here. There can be one or more.

[0156] The heat exchange assembly 2 includes at least two heat exchange elements, that is, the number of heat exchange elements is multiple.

[0157] At least one heat exchanger is configured as a flexible element 21, meaning that the number of flexible elements 21 is one or more. In embodiments where multiple heat exchangers are configured as flexible elements 21, the flexible elements 21 may be the same or different.

[0158] The phrase "at least one heat exchanger is a rigid member 22" means that the number of rigid members 22 is one or more. In embodiments where multiple heat exchangers are configured as rigid members 22, the rigid members 22 may be the same or different.

[0159] For example, the heat exchange assembly 2 includes two heat exchange elements, one of which is a flexible element 21 and the other is a rigid element 22.

[0160] For example, the rigid member 22 is a rigid plate structure that can support the flexible member 21, thereby improving the overall structural strength and stability of the heat exchange assembly 2.

[0161] The heat exchange assembly 2 is disposed on the top side X1 of at least two battery cells 1, meaning that the heat exchange assembly 2 is located on the side of at least two battery cells 1 away from the ground.

[0162] It should be noted that top side X1 and bottom side X2 are two sides with opposite top and bottom directions X. For example, please refer to [link / reference]. Figure 2 The top side X1 can be the direction of the terminal post 11 of the battery cell 1. Usually, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0163] The heat exchange component 2 is integrated into the top cover 31, meaning that the heat exchange component 2 is connected to the top cover 31 or the heat exchange component 2 can be part of the structure of the top cover 31. In this way, the top cover 31 can provide support for the heat exchange component 2, which helps to improve the overall structural strength and stability of the battery device 100.

[0164] As an example, the heat exchange component 2 and the top cover 31 can be connected by a non-detachable connection or a detachable connection.

[0165] Unless otherwise stated, in this application, non-removable connections include, but are not limited to, welding and / or bonding, etc., while detachable connections include, but are not limited to, screw connections, bolt connections and / or snap-fit ​​connections, etc.

[0166] The battery device 100 provided in this application embodiment includes a heat exchange component 2 for heat exchange with the battery cell 1. The heat exchange component 2 is configured to include a flexible component 21 and a rigid component 22. The flexible component 21 is lightweight, which helps reduce the weight of the heat exchange component 2, lowers its production cost, and also reduces the weight of the battery device 100. The rigid component 22 enhances the structural strength of the heat exchange component 2, allowing it to better support the battery cell 1. The flexible component 21 and the rigid component 22 are stacked to form at least one medium flow channel 2a. The rigid component 22 provides support for the flexible component 21, improving the overall structural strength and stability of the heat exchange component 2 and enhancing its applicability. The top side X1 of the battery cell 1 has a relatively higher temperature. The heat exchange component 2 is positioned on the top side X1 of at least two battery cells 1, bringing it closer to the relatively higher temperature area of ​​the battery cell 1. This allows for faster cooling of the high-temperature side of the battery cell 1, reducing the temperature of the high-temperature region and improving heat exchange efficiency. This, to some extent, addresses the problem of a large temperature difference between the top and bottom X sides of the battery cell 1. The heat exchange component 2 is integrated into the top cover 31. The heat exchange component 2 is connected to the top cover 31 or the heat exchange component 2 can be a part of the structure of the top cover 31. The top cover 31 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.

[0167] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a single hexahedron, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as hexahedrons, cylinders, or spheres. In one example, the box 3 can be a cuboid shape, with both its length and width directions parallel to the horizontal plane, and its length direction parallel to the longest side of the cuboid.

[0168] The material of the enclosure 3 is not limited. For example, the material of the enclosure 3 can be metal materials such as aluminum alloy or iron alloy, or polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0169] For example, the heat exchange assembly 2 also includes an inlet and an outlet, both of which are connected to the medium flow channel 2a. Here, the inlet and outlet of the heat exchange assembly 2 are for connecting to the air conditioning system of the vehicle or electrical device, or to a liquid storage device such as a water tank.

[0170] For example, please refer to Figure 4 The heat exchange component 2 also includes a connector 23 with an inlet and a connector 23 with an outlet, the connector 23 being connected to the rigid member 22.

[0171] The material of connector 23 includes, but is not limited to, metal or plastic.

[0172] For example, the connector 23 is brazed to the rigid member 22.

[0173] For example, connector 23 is a faucet.

[0174] The principle of heat exchange component 2 for heat exchange of battery cell 1 is as follows: the heat exchange medium output from the heat exchange medium source (not shown in the figure) enters the medium flow channel 2a through the inlet of heat exchange component 2. After the heat exchange medium exchanges heat with battery cell 1, the heat exchange medium flows out through the outlet of heat exchange component 2, thus completing the heat exchange of battery cell 1.

[0175] Here, the heat exchange component 2 can exchange heat with the battery cell 1 by either dissipating heat from the battery cell 1 or by heating the battery cell 1.

[0176] The principle of heat exchange component 2 for heat dissipation of 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 heat exchange component 2. After the heat exchange medium absorbs the heat generated by battery cell 1 during operation, the heat exchange medium flows out through the outlet of heat exchange component 2, releasing the heat and completing the cooling and heat dissipation of battery cell 1.

[0177] The principle of the heat exchange component 2 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, and the heat exchange medium transfers heat to the battery cell 1 to heat the battery cell 1. After heating the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, thus completing the heating of the battery cell 1.

[0178] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0179] Elongation at break is a percentage of a material's length before it breaks under tension, relative to its original length. It measures a material's ability to withstand deformation during tension; in other words, elongation at break represents a material's ductility under tensile stress.

[0180] The elongation at break of the flexible component 21 is greater than that of the rigid component 22. In other words, when subjected to tensile stress, the elongation of the flexible component 21 is greater than that of the rigid component 22, which is beneficial to improving the impact resistance, buffering performance and puncture resistance of the heat exchange assembly 2.

[0181] For example, the elongation at break of the flexible member 21 and the rigid member 22 can be measured by tensile testing or drop weight testing at room temperature and pressure. The measuring instrument may include a universal testing machine.

[0182] In some embodiments, the elongation at break of the flexible element 21 is in the range of 30% to 300%.

[0183] The elongation at break of the flexible component 21 can be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300%, or any value between two of them.

[0184] In this embodiment, by setting the elongation at break of the flexible component 21 to be in the range of 30% to 300%, the flexible component 21 can have a certain impact resistance and puncture resistance, as well as a certain structural strength.

[0185] In some embodiments, the elongation at break of the rigid member 22 is in the range of 1% to 50%.

[0186] The elongation at break of the rigid component 22 can be 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%, or 50%, or any value between two of them.

[0187] In this embodiment, by setting the elongation at break 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.

[0188] In some embodiments, the elastic modulus of at least a portion of the flexible member 21 is less than the elastic modulus of the rigid member 22.

[0189] Here, the elastic modulus of a portion of the flexible component 21 may be less than that of the rigid component 22, or the elastic modulus of the entire flexible component 21 may be less than that of the rigid component 22.

[0190] In this way, the heat exchange component 2 can have both flexibility and structural strength.

[0191] The elastic modulus describes the magnitude of a unit strain caused by a unit stress when a solid is subjected to force within a certain range; it is one of the fundamental physical quantities of materials. The larger the elastic modulus, the greater the stiffness and compressive strength of the material. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0192] The elastic modulus of the flexible component 21 and the rigid component 22 can be measured by at least one of the following methods: static tensile testing, dynamic testing, sound velocity method, nanoindentation method, and bending method. The measuring instruments can include a nanoindenter and a universal testing machine.

[0193] For example, the elastic modulus of the flexible part 21 and the rigid part 22 can be measured by nanoindentation under normal temperature and pressure. Nanoindentation uses a tiny indenter to indent the surface of the flexible part 21, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0194] In some embodiments, the flexible member 21 is thermo-pressed or bonded to the rigid member 22.

[0195] In this embodiment, the temperature of hot pressing is lower than that of welding and other connection methods, and the bonding basically does not generate high temperature, which can avoid the impact of high temperature on the flexible part 21 during the assembly process.

[0196] In some embodiments, please refer to Figure 4 , Figure 5 , Figure 9 , Figure 10 and Figure 11 The rigid component 22 is configured as the top cover 31. In other words, the rigid component 22 replaces the traditional top cover 31 and becomes part of the structure of the housing 3.

[0197] In this embodiment, the rigid member 22 is configured as the top cover 31. As part of the housing 3, the rigid member 22 can save some structure, save costs, and reduce the overall weight of the battery device 100.

[0198] In some embodiments, please refer to Figure 11 The housing 3 includes an annular frame 32 and a bottom protective plate 33. The annular frame 32 has a top opening and a bottom opening. A rigid member 22 closes the top opening of the annular frame 32, and the bottom protective plate 33 closes the bottom opening of the annular frame 32. Thus, the rigid member 22, the annular frame 32, and the bottom protective plate 33 together define a receiving cavity, in which at least two battery cells 1 are located.

[0199] In this embodiment, the rigid member 22 replaces the original top cover 31 of the housing 3, reducing the number of components in the battery device 100. The rigid member 22 forms part of the housing 3, which can reduce the overall weight of the battery device 100.

[0200] In some embodiments, please refer to Figure 6 and Figure 7 The rigid member 22 is disposed on the bottom side X2 of the top cover 31. In other words, the housing 3 has an independent top cover 31, and the rigid member 22 can be fixed to the bottom side X2 of the top cover 31.

[0201] As an example, the rigid member 22 can be fixed to the bottom side X2 of the top cover 31 by means of a non-detachable connection or a detachable connection.

[0202] In this embodiment, the rigid member 22 is disposed on the bottom side X2 of the top cover 31, and the heat exchange assembly 2 can be located entirely inside the housing 3. The top cover 31 can cover the rigid member 22, thereby better protecting the heat exchange assembly 2.

[0203] In some embodiments, please refer to Figure 6 and Figure 7 The housing 3 includes an annular frame 32, a top cover 31, and a bottom protective plate 33. The annular frame 32 has a top opening and a bottom opening; the top cover 31 closes the top opening of the annular frame 32; and the bottom protective plate 33 closes the bottom opening of the annular frame 32. The top cover 31, the annular frame 32, and the bottom protective plate 33 together define a receiving cavity, in which at least two battery cells 1 are located. The rigid member 22 is configured as the top cover 31.

[0204] The rigid member 22 is configured as the top cover 31, meaning that the rigid member 22 can replace the top cover 31, and the flexible member 21 is directly connected to the bottom side X2 of the top cover 31. In this way, the rigid member 22 can close the top side opening of the annular frame 32.

[0205] As an example, the rigid member 22 can be welded to the annular frame 32 or connected by fasteners. Fasteners include, but are not limited to, screws or bolts.

[0206] The annular frame 32 can be generally square, rectangular, or other shaped rings. In some embodiments, the annular frame 32 may include four side plates, which may be extruded sheet profiles, and the four side plates are welded together circumferentially to form the annular frame 32.

[0207] The cavity can be a sealed space or an unsealed space.

[0208] The bottom guard plate 33 can be welded to the annular frame 32 or connected by fasteners.

[0209] In this embodiment, the rigid member 22 replaces the cover plate, and the flexible member 21 is connected to the bottom side X2 of the rigid member 22 and located in the receiving cavity, reducing the risk of impurities or other objects coming into contact with the flexible member 21.

[0210] In some other examples, the heat exchange assembly 2 may be located within the housing cavity, and the rigid member 22 may be disposed on the bottom side X2 of the top cover 31.

[0211] In this embodiment, the heat exchange components 2 are all located inside the housing cavity, and the housing 3 can protect the heat exchange components 2 and reduce the risk of impurities or other objects coming into contact with the heat exchange components 2.

[0212] In some embodiments, please refer to Figure 3 The housing 3 includes a housing body 34 with an opening on the top side. The rigid member 22 can close the top opening of the housing body 34 to jointly define the receiving cavity, where at least two battery cells 1 are located.

[0213] In this embodiment, the rigid member 22 can close the top opening of the box body 34. The rigid member 22 serves as the top cover 31 of the box body 3, which can reduce the overall weight of the battery pack 100.

[0214] In some embodiments, the flexible element 21 is located on the bottom side X2 of the rigid element 22, and the flexible element 21 abuts against the battery cell 1 or is connected through a thermally conductive structure.

[0215] If the flexible component 21 is located on the bottom side X2 of the rigid component 22, then the flexible component 21 is located on the side of the rigid component 22 closer to the battery cell 1.

[0216] The flexible component 21 abuts against the battery cell 1. The flexible component 21 is flexible and can undergo elastic deformation. The flexible component 21 can press against the battery cell 1, so that the flexible component 21 can better fit the battery cell 1 and increase the heat exchange area.

[0217] The flexible component 21 is connected to the battery cell 1 through a thermally conductive structure. The thermally conductive structure is a structure made of a good conductor of heat. For example, the thermal conductivity of the thermally conductive structure is not less than 30 W / (m·K). The thermally conductive structure has good thermal conductivity and connection function. The thermally conductive structure can establish a heat conduction path between the flexible component 21 and the battery cell 1, thereby improving heat exchange efficiency.

[0218] The specific material of the thermally conductive structure is not limited. For example, the thermally conductive structure includes, but is not limited to, thermally conductive adhesives, etc.

[0219] In this embodiment, the flexible component 21 abuts against the battery cell 1, allowing the flexible component 21 to better conform to the battery cell 1 and increase the heat exchange area. The flexible component 21 and the battery cell 1 are connected by a thermally conductive structure, which has good thermal conductivity and can establish a heat conduction path between the flexible component 21 and the battery cell 1, thereby improving heat exchange efficiency.

[0220] In some embodiments, a heat exchange structure may also be provided on the bottom side X2 of the battery cell 1. The heat exchange structure may also include the rigid member 22 and the flexible member 21 of this application. The rigid member 22 and the flexible member 21 are stacked to form a heat exchange channel, through which the heat exchange medium of this application can circulate. The heat exchange structure may adopt the structure of the heat exchange component 2 in any embodiment of this application as needed, which will not be described in detail here. In this way, the heat exchange component 2 is provided on the top side X1 of the battery cell 1, and the heat exchange structure is provided on the bottom side X2 of the battery cell 1, thereby improving the heat exchange performance of the system.

[0221] In related technologies, heat exchange components generally only have one side in contact with the battery cell for heat exchange, while the surface of the heat exchange component that is far from the battery cell is prone to heat exchange with the ambient air. Especially during vehicle operation, the heat exchange component and the air undergo severe natural convection, resulting in heat loss and reducing the energy efficiency of the entire system.

[0222] In some embodiments, please refer to Figure 10 The battery device 100 includes a heat insulation element 4, which is disposed on the side of the heat exchange assembly 2 away from at least two battery cells 1.

[0223] The insulation element 4 is disposed on the side of the heat exchange assembly 2 away from at least two battery cells 1. For example, the insulation element 4 is disposed on the top side X1 of the heat exchange assembly 2.

[0224] Insulation component 4 is a structure that provides thermal insulation and reduces heat transfer.

[0225] The thermal conductivity of the insulation component 4 is small. For example, the thermal conductivity of the insulation component 4 is not greater than 0.23 W / (m·K), and preferably, the thermal conductivity of the insulation component 4 is not greater than 0.05 W / (m·K).

[0226] It should be noted that the unit "W / (m·K)" means watts per (meter·Kelvin).

[0227] In this embodiment, the side of the heat exchange component 2 facing the battery cell 1 is used for heat exchange with the battery cell 1, and the side of the heat exchange component 2 away from the battery cell 1 is provided with a heat insulation component 4. The heat insulation component 4 can better isolate the heat exchange component 2 from the environment, increase the thermal resistance of the heat exchange component 2, thereby reducing the heat exchange between the heat exchange component 2 and the environment, reducing the heat diffusion of the heat exchange component 2 to the environment, and improving the heat insulation performance of the heat exchange component 2.

[0228] The material of the insulation component 4 is not limited. For example, the insulation component 4 includes, but is not limited to, polyimide and / or flame-retardant foam, etc.

[0229] In some embodiments, the insulation member 4 may cover all or part of the surface of the heat exchange assembly 2 away from the battery cell 1. For example, the insulation member 4 may cover all or part of the surface of the rigid member 22 away from the battery cell 1.

[0230] In some embodiments, please refer to Figure 10 The insulation component 4 is attached to the top surface of the heat exchange component 2.

[0231] As an example, the surface morphology of the insulation component 4 can be the same as that of the top surface of the heat exchange assembly 2. For example, if the top surface of the heat exchange assembly 2 is flat, the surface of the insulation component 4 can also be flat. Or, for example, if the top surface of the heat exchange assembly 2 is a concave-convex surface, the surface of the insulation component 4 can also be a concave-convex surface.

[0232] In this embodiment, the insulation component 4 is attached to the top surface of the heat exchange component 2, so there is no gap between the insulation component 4 and the heat exchange component 2. The heat exchange component 2 can support the insulation component 4. The assembly between the insulation component 4 and the heat exchange component 2 is stable, the process is simple, and it is easy to manufacture.

[0233] In some embodiments, at least a portion of the insulation element 4 is spaced apart from the top surface of the heat exchange assembly 2 to form an insulation cavity, which is filled with air.

[0234] A heat insulation cavity is formed between the heat insulation component 4 and the top surface of the heat exchange component 2. In other words, at least a portion of the heat insulation component 4 constitutes the sidewall of the heat insulation cavity, and the top surface of the heat exchange component 2 also constitutes the sidewall of the heat insulation cavity.

[0235] It should be noted that there is no limit to the specific number of insulation cavities. There can be one or more.

[0236] The insulation cavity can be a sealed chamber. In other embodiments, the insulation cavity can also be filled with other poor conductors of heat, such as gases or liquids with low thermal conductivity.

[0237] In this embodiment, the insulation cavity can provide thermal insulation function. When the flexible component 21 is impacted, the insulation cavity can absorb energy through deformation, thereby mitigating the impact. Air has a very low thermal conductivity, and the air layer formed between the heat exchange component 2 and the insulation component 4 can better prevent the heat of the heat exchange component 2 from being lost to the environment, thereby improving the thermal insulation performance of the heat exchange component 2.

[0238] The connection method between the insulation component 4 and the heat exchange component 2 is not limited. If the insulation component 4 is an independently manufactured film layer, it can be bonded or hot-pressed to the surface of the heat exchange component 2. The insulation component 4 can also be a coating layer, which is attached to the surface of the heat exchange component 2 through intermolecular forces or other means.

[0239] In some embodiments, please refer to Figures 5 to 8 At least a portion of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201.

[0240] At least a portion of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201. As an example, in some embodiments, a portion or all of the surface of the flexible member 21 has an anti-corrosion layer 201; in other embodiments, a portion or all of the surface of the rigid member 22 has an anti-corrosion layer 201; and in still other embodiments, at least a portion of the surface of the flexible member 21 and at least a portion of the surface of the rigid member 22 both have an anti-corrosion layer 201.

[0241] The anti-corrosion layer 201 has anti-corrosion function, which means that the anti-corrosion layer 201 can withstand the components of the heat exchange medium and / or environment and does not react chemically with the components of the heat exchange medium and / or environment.

[0242] In this embodiment, at least a portion of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201. The anti-corrosion layer 201 provides anti-corrosion function, improves the anti-corrosion performance of the heat exchange component 2, and improves the tolerance of the heat exchange component 2 to corrosive substances such as heat exchange medium and substances in the environment, thereby improving the reliability of the heat exchange component 2.

[0243] In some embodiments, please refer to Figure 5 The top surface of the rigid component 22 is covered with an anti-corrosion layer 201.

[0244] The top surface of the rigid member 22 is the surface of the rigid member 22 that is away from the battery cell 1.

[0245] The top surface of the rigid component 22 is covered with an anti-corrosion layer 201, which means that part or all of the top surface of the rigid component 22 is covered with the anti-corrosion layer 201.

[0246] As an example, rigid member 22 is configured as a top cover 31, and the top surface of rigid member 22 is covered with an anti-corrosion layer 201. In this example, the top surface of rigid member 22 is exposed to the environment and is easily exposed to corrosive substances in the environment.

[0247] In this embodiment, the top surface of the rigid member 22 is covered with an anti-corrosion layer 201, which can isolate the environment from at least part of the top surface of the rigid member 22 and reduce the risk of corrosion of the top surface of the rigid member 22.

[0248] In some embodiments, at least a portion of the circumferential surface of the rigid member 22 may also be covered by the anti-corrosion layer 201. The circumferential surface of the rigid member 22 refers to the surface of the rigid member 22 surrounding a straight line extending in the top-bottom direction X. With this design, the anti-corrosion layer 201 can isolate the environment from at least a portion of the circumferential surface of the rigid member 22, reducing the risk of corrosion to the circumferential surface of the rigid member 22.

[0249] In some embodiments, the rigid member 22 forms at least a portion of the surface of the medium flow channel 2a covered with an anti-corrosion layer 201.

[0250] As an example, the rigid member 22 forms part of the surface of the medium flow channel 2a covered with the anti-corrosion layer 201, or the rigid member 22 forms the entire surface of the medium flow channel 2a covered with the anti-corrosion layer 201.

[0251] In this embodiment, the rigid member 22 forms a medium flow channel 2a, at least a portion of which is covered with an anti-corrosion layer 201. This improves the situation where the heat exchange medium damages the rigid member 22 and helps to improve the reliability of the heat exchange assembly 2.

[0252] In some embodiments, please refer to Figure 5 All surfaces of the rigid component 22 facing the flexible component 21 are covered with an anti-corrosion layer 201.

[0253] In this embodiment, all surfaces of the rigid member 22 facing the flexible member 21 are covered with an anti-corrosion layer 201, which can reduce the manufacturing difficulty of the anti-corrosion layer 201.

[0254] In some embodiments, the rigid member 22 may be covered with the anti-corrosion layer 201 only on the surface that constitutes the medium flow channel 2a, and the surface of the rigid member 22 that does not constitute the medium flow channel 2a may be covered with or not covered with the anti-corrosion layer 201.

[0255] In some embodiments, the anti-corrosion layer 201 is hot-pressed onto the surface of the rigid member 22.

[0256] In this embodiment, the anti-corrosion layer 201 is hot-pressed onto the surface of the rigid component 22. That is, the anti-corrosion layer 201 and the rigid component 22 are connected by a hot-pressing process, which is a simple molding method.

[0257] In some embodiments, the anti-corrosion layer 201 has a single-layer or multi-layered structure.

[0258] In this embodiment, the anti-corrosion layer 201 has a single-layer or multi-layer structure, and the number of layers and material of the anti-corrosion layer 201 can be designed according to the anti-corrosion requirements.

[0259] A layered structure refers to a structure that is laid out in a single or multiple layers in a planar or curved form, and the multiple layers can be parallel to each other or stacked regularly.

[0260] In some embodiments, the anti-corrosion layer 201 is made of one or more of polypropylene, polyethylene and polyamide.

[0261] Polypropylene (PP) is a semi-crystalline thermoplastic made from propylene monomers through an addition polymerization reaction.

[0262] Polyethylene (PE) is a thermoplastic resin material produced by the polymerization reaction of ethylene monomers.

[0263] Polyamide (PA) is a general term for thermoplastic resins whose molecular backbone contains repeating amide groups (—[NHCO]—).

[0264] As an example, the anti-corrosion layer 201 may consist of only one of the following: a polypropylene layer, a polyethylene layer, and a polyamide layer. That is, the anti-corrosion layer 201 is a single-layered structure.

[0265] As an example, the anti-corrosion layer 201 may comprise at least two of the following: a polypropylene layer, a polyethylene layer, and a polyamide layer, laminated together. In other words, the anti-corrosion layer 201 is a multi-layered structure.

[0266] In this embodiment, the anti-corrosion layer 201 is made of one or more of polypropylene, polyethylene, and polyamide. The anti-corrosion layer 201 can provide good waterproofing and / or resistance to corrosion by heat exchange media.

[0267] In some embodiments, please refer to Figure 8 The flexible component 21 has a layered structure, including a metal layer 211 and two anti-corrosion layers 201, with the metal layer 211 stacked between the two anti-corrosion layers 201.

[0268] Metal layer 211 is a structure formed by spreading metal material.

[0269] The anti-corrosion layer 201 is a structure with anti-corrosion function.

[0270] It is understandable that the two anti-corrosion layers 201 can be made of the same material or different materials.

[0271] In this embodiment, the flexible component 21 can be provided with plasticity by the metal layer 211, so that the flexible component 21 can maintain its basic shape. The metal layer 211 is stacked between two anti-corrosion layers 201. The two anti-corrosion layers 201 can encapsulate the metal layer 211, preventing the metal layer 211 from contacting the heat exchange medium and corrosive substances in the environment, thereby improving the corrosion resistance of the flexible component 21.

[0272] In some embodiments, the rigid member 22 is disposed on the side of the flexible member 21 away from the battery cell 1. The surface of the rigid member 22 has a heat insulation member 4 and an anti-corrosion layer 201. The heat insulation member 4 can be disposed on the surface of the rigid member 22 away from the flexible member 21, and the anti-corrosion layer 201 can be disposed on the surface of the heat insulation member 4 away from the rigid member 22. That is, the anti-corrosion layer 201, the heat insulation member 4, and the rigid member 22 are stacked sequentially. The relative positions of the anti-corrosion layer 201 and the heat insulation member 4 can be set according to requirements.

[0273] In some embodiments, the rigid member 22 is disposed on the side of the flexible member 21 away from the battery cell 1. The surface of the rigid member 22 has a heat insulation member 4 and an anti-corrosion layer 201. The anti-corrosion layer 201 can be disposed on the surface of the rigid member 22 away from the flexible member 21, and the heat insulation member 4 can be disposed on the surface of the anti-corrosion layer 201 away from the rigid member 22. That is, the heat insulation member 4, the anti-corrosion layer 201, and the rigid member 22 are stacked sequentially. The relative positions of the anti-corrosion layer 201 and the heat insulation member 4 can be set according to requirements.

[0274] In some embodiments, please refer to Figure 1 and Figure 9 The battery device 100 includes an insulating member 5. The terminal of the battery cell 1 is disposed on the side close to the heat exchange assembly 2 in a first direction. The insulating member 5 is disposed between the heat exchange assembly 2 and at least two battery cells 1.

[0275] Insulator 5 is a structure that provides insulation.

[0276] An insulating element 5 is disposed between the heat exchange assembly 2 and at least two battery cells 1. For example, the insulating element 5 is disposed on the bottom side X2 of the heat exchange assembly 2.

[0277] In this embodiment, the side of the heat exchange component 2 that is close to the battery cell 1 can easily or needs to contact the battery cell 1. However, the terminal of the battery cell 1 is close to the heat exchange component 2 and the terminal of the battery cell 1 is charged. The insulating member 5 is located between the battery cell 1 and the heat exchange component 2, which can prevent the battery cell 1 and the heat exchange component 2 from conducting electricity and improve safety.

[0278] In some embodiments, the insulating element 5 is disposed on the bottom surface of the heat exchange assembly 2.

[0279] The bottom surface of the heat exchange component 2 is the surface of the heat exchange component 2 facing the battery cell 1.

[0280] In this embodiment, the insulating element 5 is disposed on the bottom surface of the heat exchange assembly 2. The heat exchange assembly 2 can provide an installation position for the insulating element 5. The insulating element 5 can better fit the top surface of the battery cell 1 to insulate and isolate the heat exchange assembly 2 and the battery cell 1.

[0281] In some embodiments, the insulating element 5 is coated on the bottom surface of the heat exchange assembly 2. That is, the insulating element 5 can be a coating structure.

[0282] The specific method of coating the insulating component 5 is not limited. For example, the method of coating the insulating component 5 includes, but is not limited to, spraying, brushing, or rolling.

[0283] The insulating component 5 includes, but is not limited to, insulating varnish. For example, the insulating varnish includes, but is not limited to, epoxy resin insulating varnish, UV-cured insulating varnish, etc. These insulating varnishes can be applied to the bottom surface of the heat exchange assembly 2 by coating.

[0284] In this embodiment, the insulating element 5 is coated on the bottom surface of the heat exchange component 2. The insulating element 5 and the bottom surface of the heat exchange component 2 can be tightly bonded by intermolecular forces, resulting in strong adhesion and reducing the risk of the insulating element 5 falling off the bottom surface of the heat exchange component 2.

[0285] In some embodiments, the insulating element 5 is bonded to the bottom surface of the heat exchange assembly 2.

[0286] The insulating component 5 can be a separately manufactured membrane structure. The insulating component 5 can be glued to the bottom surface of the heat exchange assembly 2 by glue, double-sided tape or other adhesive substances.

[0287] The insulating component 5 includes, but is not limited to, an insulating film. For example, the insulating film includes, but is not limited to, PET insulating film, polyolefin film, and ceramicized silicone rubber insulating film, etc. These insulating films can be fixed to the bottom surface of the heat exchange assembly 2 by adhesive bonding.

[0288] In this embodiment, the insulating component 5 can be manufactured independently and then assembled onto the bottom surface of the heat exchange component 2 using an adhesive. The assembly process is simple, the yield rate is high, and the production cost is relatively low.

[0289] In some embodiments, the rigid member 22 is disposed on the side of the flexible member 21 away from the battery cell 1. An insulating member 5 is disposed on the surface of the flexible member 21 facing the battery cell 1, or the layer of the flexible member 21 closest to the battery cell 1 is an insulating member 5.

[0290] For example, the flexible member 21 includes a metal layer 211 and an insulating layer, the insulating layer being disposed on the side of the metal layer 211 close to the battery cell 1.

[0291] In this embodiment, an additional insulating layer 5 can be added to the surface of the flexible member 21, or the insulating layer 5 can be made to be the layer of the flexible member 21 closest to the battery cell 1.

[0292] It should be noted that when the flexible component 21 has a multi-layered structure, the layer of the flexible component 21 closest to the battery cell 1 can be made of a material with both anti-corrosion and insulation functions.

[0293] In some embodiments, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot-pressed region and a medium flow channel 2a, and the flexible member 21 and the rigid member 22 are interconnected in at least a portion of the hot-pressed region.

[0294] In other words, the flexible part 21 and the rigid part 22 are connected by hot pressing, and the hot pressing area and the medium flow channel 2a are formed by hot pressing. This molding method is simple.

[0295] Here, the flexible component 21 is sealed by hot pressing. The hot pressing process can effectively ensure the good sealing of the heat exchange component 2 and prevent it from cracking.

[0296] In this embodiment, the flexible component 21 is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing. The hot pressing area divides the heat exchange component 2 to form at least one medium flow channel 2a. This molding method is simple.

[0297] For example, the hot-pressing region includes a heat-sealed area and a non-heat-sealed area. The non-heat-sealed area and the medium flow channel 2a are located on both sides of the heat-sealed area, which helps to reduce the width of the heat-sealed area and improve the problem of excessively high temperature caused by an excessively wide heat-sealed area, which affects the hot-pressing quality and damages the flexible component 21. In addition, the non-heat-sealed area can also form a stress-relieving buffer when the flexible component 21 is folded, which improves the situation where stress concentration occurs in the heat-sealed area and causes damage to the heat-sealed area.

[0298] In related technologies, heat exchange components are formed by welding two high-strength aluminum alloys. However, high-strength aluminum alloys (such as 5-series and 6-series) have a high alloy content, and alloying elements will precipitate during welding, affecting the welding quality.

[0299] In this embodiment, the heat exchange component 2 is configured to include a flexible component 21 and a rigid component 22. The flexible component 21 and the rigid component 22 are hot-pressed to form a hot-pressed region and a medium flow channel 2a. The hot-pressing temperature (150℃±10℃) is lower than the brazing temperature in related technologies, so alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 2.

[0300] In some embodiments, the flexible element 21 is in the form of a single-layer or multi-layer film.

[0301] In some embodiments, the flexible element 21 includes a metallized film.

[0302] Here, the metal plastic film is a metal-plastic composite material, which includes a metal layer 211 and a plastic layer.

[0303] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel 2a is formed between the metal plasticized film and the rigid component 22, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly 2 can be reduced. Simultaneously, because the metal plasticized film has insulating and anti-corrosion properties against the heat exchange medium, the possibility of insulation failure can be reduced, and the risk of the heat exchange assembly 2 reacting with the internally flowing heat exchange medium is also reduced, further reducing the possibility of heat exchange medium corrosion leakage.

[0304] In some embodiments, the flexible element 21 includes an aluminum-plastic film.

[0305] In this embodiment, the flexible component 21 is made of aluminum-plastic film. The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, which meet the requirements for insulation and corrosion prevention.

[0306] In some embodiments, please refer to Figure 9 The flexible component 21 has a layered structure, including a metal layer 211 and a non-metal layer 212, which are stacked sequentially.

[0307] Here, the flexible component 21 includes a metal layer 211 and a non-metal layer 212, which is a composite material component composed of a metal layer 211 and a non-metal layer 212.

[0308] For example, the metal layer 211 and the non-metal layer 212 can be formed by hot pressing or hot melting.

[0309] Here, the number of metal layers 211 and non-metal layers 212 is not limited.

[0310] In this embodiment, the flexible member 21, which is composed of a metal layer 211 and a non-metal layer 212 stacked sequentially, is thin and lightweight. Furthermore, by forming a medium flow channel 2a between the flexible member 21 and the rigid member 22, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly 2. In addition, the heat exchange assembly 2 does not react with the internally flowing heat exchange medium, therefore eliminating the possibility of corrosion and leakage.

[0311] In some embodiments, the flexible member 21 has a layered structure, including a metal layer 211 and a non-metal layer 212, which are stacked sequentially, wherein the non-metal layer 212 is disposed on the side of the metal layer 211 facing the rigid member 22.

[0312] In other words, the non-metallic layer 212 is located between the metallic layer 211 and the rigid member 22.

[0313] Here, by placing the non-metallic layer 212 on the side of the metallic layer 211 facing the rigid member 22, the non-metallic layer 212 can be thermally pressed to connect with the rigid member 22.

[0314] In some embodiments, the metal layer 211 includes one or more of aluminum foil, copper foil, and steel foil.

[0315] In this embodiment, by setting the metal layer 211 as one or more of aluminum foil, copper foil and steel foil, the flexible component 21 can have a certain structural strength and can play an isolation role.

[0316] In some embodiments, the non-metallic layer 212 includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0317] In this embodiment, by setting the non-metallic layer 212 to one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible part 21 can have a certain waterproof function and / or resistance to heat exchange medium corrosion.

[0318] For example, a non-metallic layer 212 made of a corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or additives can be added to the non-metallic layer 212 to make the non-metallic layer 212 have acid and alkali corrosion resistance.

[0319] In some embodiments, the non-metallic layer 212 is a hot-melt layer.

[0320] In this embodiment, by setting the non-metallic layer 212 as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer 212 and the metal layer 211 together through hot melting, which is simple to form and has high production efficiency.

[0321] In some embodiments, the thickness of the flexible element 21 is 0.05 mm to 1 mm.

[0322] For example, the thickness of the flexible member 21 is any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, 0.3mm, 0.5mm, 0.8mm, and 1mm, or a value between any two of them.

[0323] In this embodiment, by setting the thickness of the flexible component 21 to 0.05mm-1mm, the heat exchange component 2 made of the flexible component 21 has a certain structural strength while making the overall thickness of the heat exchange component 2 small, which is beneficial to reduce the overall volume and weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0324] In some embodiments, the thickness of the flexible element 21 is 0.08 mm to 0.2 mm.

[0325] For example, the thickness of the flexible member 21 is any one of 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.2mm, or a value between any two.

[0326] In this embodiment, by setting the thickness of the flexible component 21 to 0.08mm-0.2mm, the heat exchange component 2 made of the flexible component 21 has a certain structural strength, while further reducing the overall thickness of the heat exchange component 2, which is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0327] In some embodiments, the elastic modulus of the flexible element 21 is 0.1 MPa-10000 MPa.

[0328] For example, the elastic modulus of the flexible component 21 can be any one of 0.1MPa, 1MPa, 50MPa, 100MPa, 150MPa, 200MPa, 300MPa, 500MPa, 800MPa, 1000MPa, 1300MPa, 1500MPa, 1800MPa, 2000MPa, 2500MPa, 2800MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, 6500MPa, 7000MPa, 7500MPa, 8000MPa, 8500MPa, 8800MPa, 9000MPa, 9500MPa, 9700MPa, and 10000MPa, or a value between any two.

[0329] In this embodiment, by setting the elastic modulus of the flexible component 21 to 0.1MPa-10000MPa, the flexible component 21 has a certain structural strength, which improves the reliability of the heat exchange assembly 2, and also has a certain deformation capacity. This can improve the fit between the heat exchange assembly 2 and the housing 3 and / or the battery cell 1, thereby increasing the effective heat exchange area between the heat exchange assembly 2 and the housing 3 and / or the battery cell 1, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 2.

[0330] In some embodiments, the rigid member 22 is a metal plate.

[0331] For example, it could be an aluminum alloy.

[0332] In this embodiment, by setting the rigid component 22 as a metal plate, the metal plate has both good structural strength and good thermal conductivity. In other words, while ensuring that the heat exchange component 2 has a certain heat exchange efficiency, the rigid component 22 can also provide a certain support for the flexible component 21.

[0333] In some embodiments, the medium flow channel 2a includes multiple sub-flow channels, each battery cell 1 corresponds to multiple sub-flow channels, and the extension direction of the sub-flow channel corresponding to the battery cell 1 is perpendicular to the length direction of the battery cell 1.

[0334] Multiple sub-channels are connected to form medium channel 2a.

[0335] The extension direction of the sub-channel is perpendicular to the length direction of the battery cell 1. In other words, multiple sub-channels are arranged along the length direction of the battery cell 1, so that the length direction of the battery cell 1 corresponds to multiple sub-channels.

[0336] It is understandable that the temperature of the heat exchange medium will gradually increase along the flow direction of the heat exchange medium. Therefore, by assigning multiple sub-channels to each battery cell 1, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0337] The following describes the battery device 100 provided in this application embodiment further with a specific example. Please refer to [link to specific example]. Figures 3 to 5 , Figure 9 and Figure 10 The battery device 100 includes a housing 3, at least two battery cells 1, and a heat exchange assembly 2. The housing 3 has a top cover 31; the at least two battery cells 1 are located inside the housing 3; the heat exchange assembly 2 is disposed on the top side (X1) of the at least two battery cells 1, and the heat exchange assembly 2 includes at least two heat exchange elements, at least one of which is a flexible element 21 and at least one of which is a rigid element 22. The flexible element 21 and the rigid element 22 are stacked to form a medium flow channel 2a, which is used to conduct heat exchange medium for heat exchange with the at least two battery cells 1. The rigid element 22 is configured as the top cover 31. The flexible element 21 is located on the bottom side (X2) of the rigid element 22 and abuts against the battery cells 1. An insulation element 4 is attached to the top surface of the heat exchange assembly 2. At least a portion of the surface of the rigid element 22 constituting the medium flow channel 2a is covered with an anti-corrosion layer 201. The flexible component 21 has a layered structure, including a metal layer 211 and two anti-corrosion layers 201, with the metal layer 211 stacked between the two anti-corrosion layers 201. The insulating component 5 is disposed on the bottom surface of the heat exchange assembly 2.

[0338] The battery device 100 provided in this application embodiment includes a heat exchange component 2 for heat exchange with the battery cell 1. The heat exchange component 2 is configured to include a flexible component 21 and a rigid component 22. The flexible component 21 is lightweight, which helps reduce the weight of the heat exchange component 2, lowers its production cost, and also reduces the weight of the battery device 100. The rigid component 22 enhances the structural strength of the heat exchange component 2, allowing it to better support the battery cell 1. The flexible component 21 and the rigid component 22 are stacked to form at least one medium flow channel 2a. The rigid component 22 provides support for the flexible component 21, improving the overall structural strength and stability of the heat exchange component 2 and enhancing its applicability. The top side X1 of the battery cell 1 has a relatively higher temperature. The heat exchange component 2 is positioned on the top side X1 of at least two battery cells 1, bringing it closer to the relatively higher temperature area of ​​the battery cell 1. This allows for faster cooling of the high-temperature side of the battery cell 1, reducing the temperature of the high-temperature region and improving heat exchange efficiency. This, to some extent, addresses the problem of a large temperature difference between the top and bottom X sides of the battery cell 1. The rigid component 22 is configured as the top cover 31. As part of the housing 3, the rigid component 22 saves on structural components, reduces costs, and lightens the overall weight of the battery device 100. The flexible component 21 abuts against the battery cell 1, allowing for better fit and increasing the heat exchange area. The insulation component 4 fits against the top surface of the heat exchange assembly 2, eliminating gaps between them. The heat exchange assembly 2 supports the insulation component 4, resulting in a stable, simple, and easy-to-manufacture assembly. The rigid component 22 forms a surface layer 201 covering at least part of the medium flow channel 2a, mitigating the risk of damage to the rigid component 22 by the heat exchange medium and improving the reliability of the heat exchange assembly 2. The flexible component 21 can be made plastic through the metal layer 211, allowing it to maintain its basic shape. The metal layer 211 is stacked between two anti-corrosion layers 201, which encapsulate the metal layer 211, preventing it from contacting the heat exchange medium and corrosive substances in the environment, thus improving the corrosion resistance of the flexible component 21. The insulating component 5 is disposed on the bottom surface of the heat exchange assembly 2, providing a mounting position for the insulating component 5. The insulating component 5 can better fit the top surface of the battery cell 1, thus insulating and isolating the heat exchange assembly 2 and the battery cell 1.

[0339] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that, include: The box has a top cover; At least two battery cells are located inside the housing; A heat exchange assembly is disposed on the top side of the at least two battery cells. The heat exchange assembly includes at least two heat exchange elements, at least one of which is a flexible element and at least one of which is a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel. The medium flow channel is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells. The heat exchange component is integrated into the top cover.

2. The battery device according to claim 1, characterized in that, The rigid member is configured as the top cover or the rigid member is disposed on the bottom side of the top cover.

3. The battery device according to claim 1, characterized in that, The flexible component is located on the bottom side of the rigid component, and the flexible component abuts against the battery cell or is connected through a thermally conductive structure.

4. The battery device according to claim 1, characterized in that, The battery device includes a heat insulation component disposed on the side of the heat exchange assembly away from the at least two battery cells.

5. The battery device according to claim 4, characterized in that, The insulation component is attached to the top surface of the heat exchange assembly.

6. The battery device according to claim 4, characterized in that, At least a portion of the insulation element is spaced apart from the top surface of the heat exchange assembly to form an insulation cavity, which is filled with air.

7. The battery device according to claim 1, characterized in that, At least a portion of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer.

8. The battery device according to claim 7, characterized in that, At least a portion of the surface of the rigid member constituting the medium flow channel is covered by the anti-corrosion layer.

9. The battery device according to claim 7, characterized in that, The anti-corrosion layer covers all surfaces of the rigid component facing the flexible component.

10. The battery device according to claim 7, characterized in that, The flexible component has a layered structure, comprising a metal layer and two anti-corrosion layers, with the metal layer stacked between the two anti-corrosion layers.

11. The battery device according to any one of claims 1 to 10, characterized in that, The battery device includes an insulating component, the terminal of each battery cell is disposed on the side close to the heat exchange assembly in a first direction, and the insulating component is disposed between the heat exchange assembly and the at least two battery cells.

12. The battery device according to claim 11, characterized in that, The insulating element is disposed on the bottom surface of the heat exchange assembly.

13. The battery device according to any one of claims 1 to 10, characterized in that, The flexible component includes a metal plasticized film.

14. The battery device according to claim 13, characterized in that, The flexible component includes an aluminum-plastic film.

15. The battery device according to any one of claims 1 to 10, characterized in that, The flexible component has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

16. The battery device according to claim 15, characterized in that, The metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

17. The battery device according to claim 15, characterized in that, The non-metallic layer is a hot-melt layer.

18. The battery device according to any one of claims 1 to 10, characterized in that, The thickness of the flexible component is 0.05mm-1mm.

19. The battery device according to claim 18, characterized in that, The thickness of the flexible component is 0.08mm-0.2mm.

20. The battery device according to any one of claims 1 to 10, characterized in that, The elastic modulus of the flexible component is 0.1 MPa-10000 MPa.

21. The battery device according to any one of claims 1 to 10, characterized in that, The rigid component is a metal plate.

22. The battery device according to any one of claims 1 to 10, characterized in that, The elongation at break of the flexible component is greater than that of the rigid component.

23. The battery device according to claim 22, characterized in that, The elongation at break of the flexible component is in the range of 30% to 300%; and / or, The elongation at break of the rigid component is in the range of 1% to 50%.

24. The battery device according to any one of claims 1 to 10, characterized in that, The elastic modulus of at least a portion of the flexible component is less than that of the rigid component.

25. The battery device according to any one of claims 1 to 10, characterized in that, The flexible component is heat-pressed or bonded to the rigid component.

26. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 25.

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