A battery device and an electric appliance

Abstract

The application relates to the battery technical field and provides a battery device and a power utilization equipment. The battery device comprises at least two battery monomers and a heat exchange assembly. The heat exchange assembly is arranged at the bottom side 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 arranged as a flexible piece, and at least one heat exchange piece is arranged as a rigid piece. The flexible piece and the rigid piece are arranged in a laminated mode to form a medium flow channel. The medium flow channel is used for conducting a heat exchange medium. The heat exchange medium is used for heat exchange with the at least two battery monomers. The rigid piece can support the flexible piece, so that the overall structural strength and stability of the heat exchange assembly are improved, and the applicability of the heat exchange assembly is improved. The heat exchange assembly is arranged at the bottom side of the at least two battery monomers. Since the rigid piece can improve the structural strength of the heat exchange assembly, the heat exchange assembly can provide more stable support for the battery monomers, so that the heat exchange assembly can better bear the battery monomers.

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 device in which the heat exchange component is disposed on the bottom side of at least two battery cells, which can avoid occupying the space on the side of the battery device, facilitate the compact arrangement of multiple battery cells, and improve the energy density of the entire pack.

[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] At least two battery cells;

[0008] A heat exchange assembly is disposed on the bottom side of the at least two battery cells. The heat exchange assembly includes at least two heat exchange elements, at least one of 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.

[0009] The battery device provided in this application embodiment includes a heat exchange component for heat exchange with individual battery cells. By configuring the heat exchange component to include both flexible and rigid components, the lighter weight of the flexible component helps reduce the overall weight and production cost of the heat exchange component, and also helps reduce the weight of the battery device. 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. The heat exchange component is located on the bottom side of at least two battery cells. Because the rigid component enhances the structural strength of the heat exchange component, it provides more stable support for the battery cells, allowing the heat exchange component to better support them. Furthermore, the closer position of the heat exchange component to the bottom of the battery device lowers the center of gravity, making the battery device more adaptable to the vibration environment during vehicle operation. It also avoids occupying space on the sides of the battery device, facilitating a compact arrangement of multiple battery cells.

[0010] In some embodiments, the battery device includes a housing, the at least two battery cells are disposed within the housing, and the rigid member is configured as part of the housing.

[0011] In this embodiment, the rigid component is configured as part of the housing. That is, the rigid component is used to form a medium flow channel when stacked with the flexible component, and the rigid component is also used to form the housing. This design can reduce the number of components in the battery device and help to reduce the weight of the battery device.

[0012] In some embodiments, the housing includes a main body with an opening at the bottom, a rigid member closing the bottom opening of the main body to collectively define a receiving cavity, at least two battery cells located within the receiving cavity, and a flexible member connecting to the bottom of the rigid member.

[0013] In this embodiment, the rigid component seals the bottom opening of the main body of the casing. As the bottom wall of the casing, the rigid component reduces the overall weight of the battery pack. The flexible component connects to the bottom of the rigid component, reducing the risk of individual battery cells contacting and compressing the flexible component. The rigid component has good structural strength, can withstand relatively large assembly forces, and maintains its shape.

[0014] In some embodiments, the rigid member includes a clearance area and a main body area. The clearance area surrounds the outer periphery of the main body area and has a projection plane perpendicular to the top and bottom directions. The projection of the flexible member is located within the projection range of the main body area. The flexible member and the main body area define the medium flow channel. The clearance area is connected to the main body of the box.

[0015] In this embodiment, the size of the flexible component is smaller than that of the rigid component. The flexible component is located within the main body area and does not come into contact with the avoidance area, thereby reducing the impact on the flexible component during the assembly process between the avoidance area and the housing.

[0016] In some embodiments, the clearance area is welded to the box body or connected by fasteners.

[0017] In this embodiment, the avoidance area is welded to the main body of the box. Since the projection of the flexible component is located within the projection range of the main body area, the distance between the welding position and the flexible component is greater than zero during the welding process. Therefore, the high temperature of welding will not directly affect the flexible component, thus reducing the risk of localized melting of the flexible component during welding. Also, since the projection of the flexible component is located within the projection range of the main body area, the distance between the fastener and the flexible component is greater than zero during the fastening assembly process between the avoidance area and the main body. Therefore, the high temperature generated during the high-speed rotation of the fastener will not directly affect the flexible component, further reducing the risk of localized melting of the flexible component during the connection process via fasteners.

[0018] In some embodiments, at least one reinforcement is provided inside and / or outside the flexible member.

[0019] In this embodiment, at least one reinforcing member is provided inside and / or outside the flexible member. The reinforcing member can provide impact resistance, improve the impact resistance of the flexible member, and reduce the risk of deformation or damage to the flexible member due to impact.

[0020] In some embodiments, both the reinforcing member and the flexible member are layered structures, with the reinforcing member stacked on the outer surface of the flexible member along the stacking direction or between two adjacent layers inside the flexible member.

[0021] In this embodiment, the flexible component has a layered structure, which is beneficial for the flexible component to cooperate with the rigid component to form a medium flow channel; the reinforcing component has a layered structure, which is beneficial for the reinforcing component to have a larger contact area with the flexible component, so as to provide structural reinforcement for multiple parts of the flexible component.

[0022] In some embodiments, the reinforcement is mesh-like.

[0023] In this embodiment, the reinforcing member is mesh-like. The mesh-like reinforcing member has good elastic deformation capability and strength, and is also lightweight. It can improve the toughness of the flexible member. In the event of an impact, the mesh-like reinforcing member causes the flexible member to rebound to restore its deformation, thereby improving the impact resistance of the heat exchange assembly.

[0024] In some embodiments, the reinforcement is made of one or more of fiber, polyethylene terephthalate, and polyimide.

[0025] In this embodiment, the fiber, polyethylene terephthalate, and polyimide all have good impact resistance, which can increase the deformation resistance of the flexible part and improve its deformation resilience.

[0026] In some embodiments, the reinforcement and the flexible member together define a buffer cavity.

[0027] In this embodiment, when the flexible component is impacted, the buffer cavity can absorb energy through deformation, thereby mitigating the impact.

[0028] In some embodiments, at least one of the buffer chambers is provided with a non-Newtonian fluid.

[0029] In this embodiment, a non-Newtonian fluid is placed inside the buffer cavity. On the one hand, under normal circumstances, the heat exchange component is mainly subjected to the expansion force of the battery cells. The expansion force is usually relatively small and will not cause the viscosity of the non-Newtonian fluid to increase sharply. In this way, the buffer cavity filled with non-Newtonian fluid can undergo compression deformation to provide expansion space for the battery cells and meet the expansion space requirements of the battery cells during normal use. On the other hand, when subjected to a large impact force, such as when a vehicle is bumped during driving, the viscosity of the non-Newtonian fluid increases instantaneously to form a buffer, disperse stress, prevent deformation of the flexible component, and improve the impact resistance of the flexible component.

[0030] In some embodiments, the heat exchange assembly is provided with an insulation element on the side away from the at least two battery cells.

[0031] 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.

[0032] In some embodiments, the insulation element is attached to the bottom surface of the heat exchange assembly.

[0033] In this embodiment, the insulation component is attached to the bottom 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.

[0034] In some embodiments, at least a portion of the insulation element is spaced apart from the bottom surface of the heat exchange assembly to form an insulation cavity filled with gas.

[0035] 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. Since gases typically have low thermal conductivity, the gas 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.

[0036] In some embodiments, an insulating element is provided between the heat exchange assembly and the at least two battery cells.

[0037] In this embodiment, the side of the heat exchange component closest to the battery cell is likely to come into contact with the battery cell, or needs to come into contact with the battery cell. 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.

[0038] In some embodiments, the insulating element is disposed on the top surface of the heat exchange assembly.

[0039] In this embodiment, the insulating element is disposed on the top 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.

[0040] In some embodiments, the flexible element includes a metallized film.

[0041] 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.

[0042] In some embodiments, the flexible element comprises an aluminum-plastic film.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or,

[0047] The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0048] 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.

[0049] In some embodiments, the non-metallic layer is a hot-melt layer.

[0050] 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.

[0051] In some embodiments, the thickness of the flexible element is 0.05mm-0.3mm.

[0052] In this embodiment, by setting the thickness of the flexible component to 0.05mm-0.3mm, the heat exchange assembly made of the flexible component has a certain structural strength while making the overall thickness of the heat exchange assembly small, which is beneficial to reduce the overall volume and weight of the battery device and increase the energy density of the battery device.

[0053] In some embodiments, the thickness of the flexible element is 0.08 mm to 0.2 mm.

[0054] 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.

[0055] In some embodiments, the elastic modulus of the flexible element is 0.1 MPa-10000 MPa.

[0056] 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.

[0057] In some embodiments, the rigid member is a metal plate.

[0058] 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.

[0059] In some embodiments, the elongation at break of the flexible element is greater than that of the rigid element.

[0060] 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.

[0061] In some embodiments, the elongation at break of the flexible element is in the range of 30% to 300%; and / or,

[0062] The elongation at break of the rigid component is in the range of 1% to 50%.

[0063] 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.

[0064] In some embodiments, the elastic modulus of at least a portion of the flexible element is less than that of the rigid element.

[0065] In this embodiment, the elastic modulus of at least a portion of the flexible component is less than that of the rigid component, which enables the heat exchange assembly to have a flexible function while also enabling the heat exchange assembly to have a certain structural strength.

[0066] This application also provides an electrical device including any of the battery devices described above. Attached Figure Description

[0067] Figure 1This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0068] Figure 2 This is an exploded schematic diagram of the battery device in some embodiments of this application;

[0069] Figure 3 for Figure 2 Explosion-proof diagram of the heat exchange component;

[0070] Figure 4 for Figure 3 Assembly diagram of the heat exchange components;

[0071] Figure 5 This is a schematic diagram of the assembly of the heat exchange components in some other embodiments of this application;

[0072] Figure 6 This is an exploded view of the flexible and reinforcing members in some embodiments of this application;

[0073] Figure 7 This is an assembly diagram of the heat exchange components and reinforcements in some embodiments of this application;

[0074] Figure 8 for Figure 7 Schematic diagram of cross-section along the middle AA direction;

[0075] Figure 9 This is an exploded view of the flexible and reinforcing members in some other embodiments of this application;

[0076] Figure 10 This is an exploded view of the flexible and insulating components in some embodiments of this application;

[0077] Figure 11 This is an exploded view of the flexible and insulating components in other embodiments of this application;

[0078] Figure 12 For this application Figure 11 Assembly diagram of flexible components and insulation components;

[0079] Figure 13 for Figure 12 Schematic diagram of cross-section along the middle BB direction;

[0080] Figure 14 This is an exploded schematic diagram of the heat exchange components and insulation components in some embodiments of this application;

[0081] Figure 15 This is an exploded view of the heat exchange components and insulation elements in some other embodiments of this application.

[0082] Explanation of reference numerals in the attached figures

[0083] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1, Battery Cell; 2, Heat Exchange Assembly; 2a, Medium Flow Channel; 2b, Buffer Chamber; 21, Flexible Component; 211, Metal Layer; 212, Non-metallic Layer; 22, Rigid Component; 221, Clearance Area; 222, Main Body Area; 23, Connector; 201, Reinforcing Component; 210, Thermal Insulation Component; 210a, Thermal Insulation Chamber; 2100, Insulating Component; 2200, Adhesive Layer; 3, Housing; 31, Annular Frame; 32, Top Cover; 33, Bottom Protective Plate. Detailed Implementation

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Please see Figure 1 and Figure 2 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.).

[0095] 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.

[0096] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0097] 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.).

[0098] 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.

[0099] 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.

[0100] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0101] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] Liquid electrolytes include electrolyte salts and solvents.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0111] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] 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.

[0113] 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.

[0114] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0115] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0116] In some implementations, the electrode assembly is a stacked structure.

[0117] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0118] 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.

[0119] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0120] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0121] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0122] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0123] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0124] 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 structure 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.

[0125] 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.

[0126] 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.

[0127] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0128] 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.

[0129] 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.

[0130] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0131] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] The battery device 100 provided in this application includes the battery cell 1 in any one embodiment of this application.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 1.

[0140] 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.

[0141] In some embodiments, the battery device 100 may be a battery pack.

[0142] Please see Figure 2 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.

[0143] 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.

[0144] In some embodiments, the housing 3 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 3 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 3 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0145] 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.

[0146] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, vehicles 1000, ships, or spacecraft. Vehicles 1000 can include electric vehicles and electric cars; electric toys can include electric vehicle 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, etc.; spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0147] Energy storage devices include, but are not limited to, energy storage containers or energy storage cabinets.

[0148] 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.

[0149] 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 1 As 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.

[0150] 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.

[0151] 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 battery cells to regulate their temperature. For example, when the individual battery cells are heating up, the heat exchange components absorb the heat from the individual battery cells to dissipate heat and cool them down. When the ambient temperature is low and the individual battery cells need to be heated up, the heat exchange components release heat to the individual battery cells. However, the heat exchange components have a relatively large mass, increasing the weight of the battery device.

[0152] In view of this, embodiments of this application provide a battery device, which includes at least two battery cells and a heat exchange assembly. The heat exchange assembly is disposed on the bottom side of the at least two battery cells and 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.

[0153] The battery device provided in this application embodiment includes a heat exchange component for heat exchange with individual battery cells. By configuring the heat exchange component to include both flexible and rigid components, the lighter weight of the flexible component helps reduce the overall weight and production cost of the heat exchange component, and also helps reduce the weight of the battery device. 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. The heat exchange component is located on the bottom side of at least two battery cells. Because the rigid component enhances the structural strength of the heat exchange component, it provides more stable support for the battery cells, allowing the heat exchange component to better support them. Furthermore, the closer position of the heat exchange component to the bottom of the battery device lowers the center of gravity, making the battery device more adaptable to the vibration environment during vehicle operation. It also avoids occupying space on the sides of the battery device, facilitating a compact arrangement of multiple battery cells and increasing the overall energy density of the battery pack.

[0154] 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 2 to 4 This application provides a battery device 100, which includes at least two battery cells 1 and a heat exchange assembly 2.

[0155] The heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1. 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. The medium flow channel 2a is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] It should be noted that the specific number of medium flow channels 2a is not limited here. There can be one or more.

[0163] The heat exchange assembly 2 includes at least two heat exchange elements, that is, the number of heat exchange elements is multiple.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] The heat exchange assembly 2 is disposed on the bottom side X2 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 closest to the ground.

[0169] It should be noted that the top side X1 and the bottom side X2 are two sides with opposite top and bottom directions X. Usually, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0170] The battery device 100 provided in this application embodiment includes a heat exchange component 2 for exchanging heat with the battery cell 1. By configuring the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the lighter weight of the flexible member 21 helps reduce the weight of the heat exchange component 2, thereby lowering its production cost and also reducing the weight of the battery device 100. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which helps improve the overall structural strength and stability of the heat exchange component 2 and enhances its applicability. The heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1. Since the rigid member 22 can improve the structural strength of the heat exchange assembly 2, the heat exchange assembly 2 can provide more stable support for the battery cells 1, so that the heat exchange assembly 2 can better support the battery cells 1. Moreover, the position of the heat exchange assembly 2 is closer to the bottom of the battery device 100, which can lower the center of gravity of the battery device 100. The battery device 100 is more adaptable to the vibration environment during vehicle operation. It can also avoid occupying the space on the side of the battery device 100, which facilitates the compact arrangement of multiple battery cells 1 and improves the energy density of the entire pack.

[0171] In some embodiments, please refer to Figures 2 to 4 The battery device 100 includes a housing 3, at least two battery cells 1 are disposed inside the housing 3, and a rigid member 22 is configured as part of the housing 3.

[0172] 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.

[0173] The heat exchange component 2 is connected to the housing 3, or the heat exchange component 2 can be part of the structure of the housing 3. In this way, the housing 3 can provide support for the heat exchange component 2, which helps to improve the overall structural strength and stability of the battery device 100.

[0174] As an example, the heat exchange component 2 and the housing 3 can be connected by a non-detachable connection or a detachable connection.

[0175] 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.

[0176] As an example, the heat exchange component 2 being part of the housing 3 means that the heat exchange component 2 constitutes part of the side wall of the housing 3. For example, the rigid member 22 can constitute the bottom wall and / or peripheral side wall of the housing 3, etc.

[0177] In this embodiment, the rigid member 22 is configured as part of the housing 3. That is, the rigid member 22 is used to form a medium flow channel 2a by being stacked with the flexible member 21, and the rigid member 22 is also used to form the housing 3. This design can reduce the number of parts of the battery device 100 and help to reduce the weight of the battery device 100.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] For example, please refer to Figure 3 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.

[0182] The material of connector 23 includes, but is not limited to, metal or plastic.

[0183] For example, the connector 23 is brazed to the rigid member 22.

[0184] For example, connector 23 is a water tap.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] In some embodiments, the elongation at break of the flexible element 21 is in the range of 30% to 300%.

[0194] 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.

[0195] 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.

[0196] In some embodiments, the elongation at break of the rigid member 22 is in the range of 1% to 50%.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] In this way, the heat exchange component 2 can have both flexibility and structural strength.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] In some embodiments, please refer to Figure 2 and Figure 3 The housing 3 includes a housing body with an opening on the bottom side. A rigid member 22 closes the bottom opening of the housing body to jointly define a receiving cavity. At least two battery cells 1 are located in the receiving cavity. A flexible member 21 connects to the bottom X2 of the rigid member 22.

[0206] The flexible component 21 is connected to the bottom side X2 of the rigid component 22, so the flexible component 21 is located on the side of the rigid component 22 away from the battery cell 1.

[0207] In this embodiment, the rigid member 22 closes the bottom opening of the main body of the box. As the bottom wall of the box 3, the rigid member 22 can reduce the overall weight of the battery pack 100. The flexible member 21 connects to the bottom X2 of the rigid member 22, which reduces the risk of the battery cell 1 contacting and squeezing the flexible member 21 to a certain extent. The rigid member 22 has good structural strength, can withstand relatively large assembly forces, and maintain its shape.

[0208] As an example, at least two battery cells 1 are connected to the rigid member 22. This connection of at least two battery cells 1 to the rigid member 22 can be two, three, or more battery cells 1 connected to the rigid member 22; exemplaryly, all battery cells 1 are connected to the rigid member 22. The manner in which the battery cells 1 are connected to the rigid member 22 is not limited; the battery cells 1 can be connected to the rigid member 22 via a thermally conductive structure.

[0209] A thermally conductive structure refers to a structure manufactured using 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 rigid component 22 and the battery cell 1, thereby improving heat exchange efficiency.

[0210] 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.

[0211] In this embodiment, at least two battery cells 1 are connected to the rigid member 22, which can more stably support the battery cells 1.

[0212] In some embodiments, the rigid member 22 may be a flat plate structure with both sides being planar along the thickness direction.

[0213] In this embodiment, the rigid component 22 has a simple structure and is easy to manufacture. For example, the rigid component 22 can be formed using processes such as extrusion.

[0214] In some embodiments, a portion of the rigid member 22 protrudes towards the bottom side X2 to form a recessed area, where at least two battery cells 1 are located.

[0215] For example, at least two battery cells 1 can be bonded to the top surface of the recessed area.

[0216] In this embodiment, the recessed area is beneficial for limiting at least two battery cells 1, which facilitates the assembly between the battery cells 1 and the rigid member 22.

[0217] In some embodiments, please refer to Figures 2 to 5The rigid member 22 includes a clearance area 221 and a main body area 222. The clearance area 221 surrounds the outer periphery of the main body area 222 and takes a plane perpendicular to the top and bottom direction X as the projection plane. The projection of the flexible member 21 is located within the projection range of the main body area 222. The flexible member 21 and the main body area 222 define a medium flow channel 2a. The clearance area 221 is connected to the main body of the box.

[0218] The avoidance zone 221 surrounds the outer perimeter of the main area 222. The avoidance zone 221 can be roughly circular and encloses the main area 222.

[0219] With the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible component 21 is located within the projection range of the main body area 222. That is to say, the projection of the flexible component 21 will not overlap with the projection of the avoidance area 221. In other words, the projection of the avoidance area 221 surrounds the projection of the flexible component 21.

[0220] In this embodiment, the size of the flexible component 21 is smaller than that of the rigid component 22. The flexible component 21 is within the main body area 222 and does not come into contact with the avoidance area 221, thereby reducing the impact on the flexible component 21 during the assembly process of the avoidance area 221 and the box body.

[0221] In some embodiments, please refer to Figure 4 and Figure 5 The rigid member 22 can be a flat plate structure with both sides being planar along the thickness direction. The rigid member 22 can be virtually divided into the avoidance area 221 and the main body area 222 by dashed lines L or solid lines.

[0222] In some embodiments, the main body region 222 may be a recessed area, that is, with a plane perpendicular to the top-bottom direction X as the projection plane, the projection of the recessed area coincides with the projection of the main body region 222, and the main body region 222 and the avoidance area 221 have a stepped structure along the thickness direction of the rigid member 22. In this way, the main body region 222 and the avoidance area 221 can have obvious shape differences.

[0223] In some cases, the housing 3 and the heat exchange component 2 are connected by welding. Taking friction stir welding as an example, the temperature of friction stir welding is high, which may be much higher than the melting point of the flexible part 21. For example, the melting point of the flexible part 21 may be between 140°C and 180°C, which may cause the flexible part 21 to melt at high temperature during welding.

[0224] In some embodiments, the clearance area 221 is welded to the main body of the enclosure. See also... Figure 4 , Figure 4 The avoidance zone 221 is used for welding.

[0225] As an example, the clearance zone 221 and the main body of the box can be welded by friction stir welding (i.e., FSW).

[0226] In one example, the width of the clearance area 221 is between 5mm and 15mm, and the size of the welding area can be between 3mm and 8mm.

[0227] In this embodiment, the avoidance area 221 is welded to the main body of the box. Since the projection of the flexible component 21 is located within the projection range of the main body area 222, during the welding process between the avoidance area 221 and the main body of the box, the distance between the welding position and the flexible component 21 is greater than zero. The high temperature of welding will not directly affect the flexible component 21, thereby reducing the risk of local melting of the flexible component 21 during the welding process.

[0228] It should be noted that the unit "℃" refers to degrees Celsius.

[0229] In some cases, the main body of the box and the heat exchange component 2 are connected by screws, and the high temperature caused by the high speed of the screw rotation may melt the flexible part 21.

[0230] In some embodiments, the clearance area 221 is connected to the housing body by fasteners. See also... Figure 5 , Figure 5 The clearance zone 221 is used for connection with fasteners.

[0231] Fasteners include, but are not limited to, screws or bolts.

[0232] In one example, the width of the clearance zone 221 is between 5mm and 10mm.

[0233] As an example, the clearance area 221 and the housing body can be connected by fasteners using a flow drill screw (FDS) process.

[0234] In this embodiment, since the projection of the flexible component 21 is located within the projection range of the main body area 222, during the fastening assembly process of the avoidance area 221 and the box body, the distance between the fastener and the flexible component 21 is greater than zero. The high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible component 21, thereby reducing the risk of local melting of the flexible component 21 during the connection process by the fastener.

[0235] In some embodiments, the width of the clearance area 221 is between 5mm and 15mm. Preferably, the width of the clearance area 221 is between 10mm and 15mm.

[0236] For example, the width of the avoidance area 221 is a point value of any one of 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11mm, 12mm, 14mm and 15mm or a point value between any two.

[0237] The width dimension of the avoidance zone 221 refers to the distance between the boundary line of the avoidance zone 221 and the main area 222, and the edge line of the avoidance zone 221.

[0238] In this embodiment, the width of the avoidance area 221 is moderate, with sufficient space for connection with the main body of the box to avoid the flexible component 21, while minimizing the area encroachment on the main body area 222. The main body area 222 retains enough area to form the medium flow channel 2a, taking into account the heat exchange requirements.

[0239] It should be noted that the unit "mm" refers to millimeters.

[0240] In some embodiments, please refer to Figure 2 and Figure 3 The enclosure 3 has a bottom protective plate 33. The enclosure body includes an annular frame 31 and a top cover 32. The annular frame 31 has a top side opening and a bottom side opening. The rigid member 22 is connected to the annular frame 31 and closes the bottom side opening. The top cover 32 closes the top side opening of the annular frame 31. The top cover 32, the annular frame 31 and the rigid member 22 together define a receiving cavity, in which at least two battery cells 1 are located. The bottom protective plate 33 is located on the bottom side of the flexible member 21 and is connected to the annular frame 31.

[0241] As an example, rigid member 22 can be welded to the annular frame 31 or connected by fasteners.

[0242] The annular frame 31 can be generally square, rectangular, or other shaped rings. In some embodiments, the annular frame 31 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 31.

[0243] The cavity can be a sealed space or an unsealed space.

[0244] The top cover 32 can be welded to the annular frame 31 or connected by fasteners.

[0245] The bottom guard plate 33 can be welded to the annular frame 31 or connected by fasteners.

[0246] In this embodiment, the annular frame 31 and the top cover 32 can be manufactured separately and then assembled into the main body of the box. The rigid member 22 and the main body of the box together define the receiving cavity, in which at least two battery cells 1 are located. The rigid member 22 is part of the side wall of the box body 3, which serves to protect the battery cells 1. The bottom protective plate 33 is located on the bottom side of the flexible member 21. The bottom protective plate 33 can protect the flexible member 21 and prevent objects outside the box body 3 from contacting the flexible member 21.

[0247] As an example, a bottom protective plate 33 can be provided on the bottom side X2 of the flexible component 21, and the bottom protective plate 33 is connected to the main body of the box. In this way, the bottom protective plate 33 can protect the flexible component 21.

[0248] As an example, a portion of the rigid member 22 protrudes towards the bottom X2 to form a recessed area, and the rigid member 22 closes the bottom opening of the box body. In other words, the box body and the rigid member 22 can be engaged relative to each other to define a receiving cavity.

[0249] The recessed area can be formed by a plate-shaped rigid part 22 through a stamping process.

[0250] In some embodiments, please refer to Figures 6 to 9 The flexible member 21 is provided with at least one reinforcing member 201 inside and / or outside.

[0251] The provision of at least one reinforcing member 201 inside and / or outside the flexible member 21 means that at least one reinforcing member 201 may be provided only inside the flexible member 21, or only outside the flexible member 21, or at least one reinforcing member 201 may be provided both inside and outside the flexible member 21. The number of reinforcing members 201 may be one or more.

[0252] The reinforcing member 201 is a structure that can improve the structural strength and provide impact resistance. The flexible member 21 has at least one reinforcing member 201 inside and / or outside to improve the impact resistance of the flexible member 21 and reduce the risk of the flexible member 21 being damaged by impact.

[0253] In this embodiment, at least one reinforcing member 201 is provided inside and / or outside the flexible member 21. The reinforcing member 201 can provide impact resistance, improve the anti-collision performance of the flexible member 21, and reduce the risk of deformation or damage to the flexible member 21 due to impact.

[0254] In some embodiments, please refer to Figures 6 to 9 Both the reinforcing member 201 and the flexible member 21 are layered structures. The reinforcing member 201 is stacked on the outer surface of the flexible member 21 along the stacking direction or between two adjacent layers inside the flexible member 21.

[0255] 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.

[0256] It should be noted that the reinforcing member 201 can be a single-layer or multi-layered structure. The flexible member 21 can also be a single-layer or multi-layered structure.

[0257] As an example, the reinforcing member 201 can be stacked on the outer surface of the flexible member 21 along the stacking direction; in other words, the reinforcing member 201 covers the outer surface of the flexible member 21 along the stacking direction. Here, the flexible member 21 can be a single-layer or multi-layered structure, and the reinforcing member 201 can be a single-layer or multi-layered structure.

[0258] As an example, the reinforcing member 201 can be stacked between two adjacent layers inside the flexible member 21; in other words, the reinforcing member 201 is sandwiched between two adjacent layers inside the flexible member 21. Here, the flexible member 21 is a multi-layered structure, and the reinforcing member 201 can be a single-layered or multi-layered structure.

[0259] In this embodiment, the flexible member 21 has a layered structure, which is beneficial for the flexible member 21 and the rigid member 22 to cooperate in forming a medium flow channel 2a; the reinforcing member 201 has a layered structure, which is beneficial for the reinforcing member 201 to have a larger contact area with the flexible member 21, so as to provide structural reinforcement for multiple parts of the flexible member 21.

[0260] In some embodiments, the reinforcement 201 is mesh-like.

[0261] A mesh is a grid-like structure formed by the interweaving of multiple connecting units. The mesh contains macroscopic pores.

[0262] In this embodiment, the reinforcing member 201 is mesh-like. The mesh-like reinforcing member 201 has good elastic deformation capability and strength, and is also lightweight. It can improve the toughness of the flexible member 21. In the event of an impact, the mesh-like reinforcing member 201 causes the flexible member 21 to rebound to restore its deformation, thereby improving the impact resistance of the heat exchange assembly 2.

[0263] In some embodiments, the reinforcing member 201 may be a dense membrane or a porous membrane. A dense membrane refers to a layered structure without micropores or macropores. A porous membrane refers to a layered structure with micropores.

[0264] Micropores are pores with a diameter of 1 mm or less. Macropores are pores with a diameter greater than 1 mm. The pores in the mesh reinforcement 201 are macropores.

[0265] In some embodiments, the reinforcement 201 is a soft structure.

[0266] Soft structures are structures that are elastic and can undergo elastic deformation to absorb kinetic energy.

[0267] In this embodiment, the reinforcing member 201 is a soft structure. The reinforcing member 201 is elastic and can absorb kinetic energy through elastic deformation and can also recover elastic deformation.

[0268] In some embodiments, the reinforcement 201 is made of one or more of fiber, polyethylene terephthalate, and polyimide.

[0269] The type of fiber is not limited; for example, the fiber includes, but is not limited to, carbon fiber.

[0270] For example, a mesh-like reinforcement 201 can be formed by using fibers as connecting units.

[0271] For example, polyethylene terephthalate (PET) can be used to form a dense film-like reinforcement 201.

[0272] For example, polyimide (PI) can be formed into a dense film-like reinforcement 201.

[0273] In this embodiment, the fiber, polyethylene terephthalate and polyimide all have good impact resistance, which can increase the deformation resistance of the flexible part 21 and improve the deformation resilience of the flexible part 21.

[0274] In some examples, the reinforcement 201 may be a double-layered structure composed of polyethylene terephthalate and polyimide.

[0275] In some examples, the reinforcement 201 may be a single-layer mesh structure made of fibers.

[0276] In some embodiments, please refer to Figure 7 and Figure 8 The reinforcing member 201 and the flexible member 21 together define the buffer cavity 2b.

[0277] As an example, the reinforcement 201 may be a dense membrane.

[0278] The number of buffer cavities 2b is unlimited; there can be one or more buffer cavities 2b, etc.

[0279] In this embodiment, when the flexible member 21 is impacted, the buffer cavity 2b can absorb energy through deformation, thereby mitigating the impact.

[0280] In some embodiments, the buffer cavity 2b may be filled with air.

[0281] In some embodiments, the buffer cavity 2b may also be filled with gaseous substances such as inert gas.

[0282] In some embodiments, at least one buffer cavity 2b is provided with a non-Newtonian fluid.

[0283] Taking a buffer cavity 2b as an example, the buffer cavity 2b can be filled with a non-Newtonian fluid.

[0284] Taking multiple buffer chambers 2b as an example, one buffer chamber 2b can be filled with air, while the remaining buffer chambers 2b can be filled with non-Newtonian fluids. In other examples, one buffer chamber 2b can be filled with a non-Newtonian fluid, while the remaining buffer chambers 2b can be filled with air. In still other examples, all buffer chambers 2b can be filled with non-Newtonian fluids.

[0285] Non-Newtonian fluids are a class of fluids that do not conform to Newton's law of viscosity. Non-Newtonian fluids have the following characteristics: they exhibit low viscosity and are relatively soft when subjected to small or uniform forces, while their viscosity increases sharply when subjected to large or rapid impact forces, exhibiting hardness and impact resistance similar to solids.

[0286] In this embodiment, a non-Newtonian fluid is provided in the buffer cavity 2b. On the one hand, under normal circumstances, the heat exchange component 2 is basically only subjected to the expansion force of the battery cell 1. The expansion force is usually relatively small and will not cause the viscosity of the non-Newtonian fluid to increase sharply. In this way, the buffer cavity 2b filled with non-Newtonian liquid can undergo compression deformation to provide expansion space for the battery cell 1 and meet the expansion space requirements of the battery cell 1 during normal use. On the other hand, when subjected to a large impact force, such as when the vehicle 1000 is bumped during driving, the viscosity of the non-Newtonian fluid increases instantaneously to form a buffer, disperse stress, prevent the flexible component 21 from deforming, and improve the impact resistance of the flexible component 21.

[0287] In some embodiments, please refer to Figures 10 to 13 The heat exchange component 2 is provided with an insulation element 210 on the side away from at least two battery cells 1.

[0288] For example, the bottom side X2 of the heat exchange assembly 2 is provided with an insulation element 210.

[0289] Insulation component 210 is a structure that provides thermal insulation and reduces heat transfer.

[0290] The thermal conductivity of the insulation component 210 is small. For example, the thermal conductivity of the insulation component 210 is not greater than 0.23 W / (m·K), and preferably, the thermal conductivity of the insulation component 210 is not greater than 0.05 W / (m·K).

[0291] It should be noted that the unit "W / (m·K)" means watts per (meter·Kelvin).

[0292] 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 210. The heat insulation component 210 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.

[0293] The material of the insulation component 210 is not limited. For example, the insulation component 210 includes, but is not limited to, polyimide and / or flame-retardant foam, etc.

[0294] In some embodiments, the insulation member 210 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 210 may cover all or part of the surface of the flexible member 21 away from the battery cell 1.

[0295] In some embodiments, please refer to Figure 10 The insulation component 210 is attached to the bottom surface of the heat exchange component 2.

[0296] As an example, the surface morphology of the insulation component 210 can be the same as that of the bottom surface of the heat exchange assembly 2. For example, if the bottom surface of the heat exchange assembly 2 is flat, the surface of the insulation component 210 can also be flat. Or, for another example, if the bottom surface of the heat exchange assembly 2 is a concave-convex surface, the surface of the insulation component 210 can also be a concave-convex surface.

[0297] In this embodiment, the insulation component 210 is attached to the bottom surface of the heat exchange component 2, so there is no gap between the insulation component 210 and the heat exchange component 2. The heat exchange component 2 can support the insulation component 210. The assembly between the insulation component 210 and the heat exchange component 2 is stable, the process is simple, and it is easy to manufacture.

[0298] In some embodiments, please refer to Figures 11 to 13 At least a portion of the insulation element 210 is spaced apart from the bottom surface of the heat exchange assembly 2 to form an insulation cavity 210a, which is filled with gas.

[0299] A heat insulation cavity 210a is formed between the heat insulation component 210 and the bottom surface of the heat exchange component 2. In other words, at least a portion of the heat insulation component 210 constitutes the sidewall of the heat insulation cavity 210a, and the bottom surface of the heat exchange component 2 also constitutes the sidewall of the heat insulation cavity 210a.

[0300] It should be noted that the specific number of insulation cavities 210a is not limited here. There can be one or more.

[0301] The heat insulation cavity 210a can be a sealed chamber, and the gas contained therein includes, but is not limited to, air. In other embodiments, the heat insulation cavity 210a can also be filled with other poor conductors of heat, such as liquids with low thermal conductivity, etc.

[0302] In this embodiment, the heat insulation cavity 210a can provide thermal insulation function. When the flexible member 21 is impacted, the heat insulation cavity 210a can absorb energy through deformation, thereby mitigating the impact. Since the thermal conductivity of gas is very low, the gas layer formed between the heat exchange component 2 and the heat insulation member 210 can better prevent the heat of the heat exchange component 2 from dissipating to the environment, thereby improving the thermal insulation performance of the heat exchange component 2.

[0303] The connection method between the insulation component 210 and the heat exchange assembly 2 is not limited. If the insulation component 210 is an independently manufactured film layer, it can be bonded or hot-pressed to the surface of the heat exchange assembly 2. The insulation component 210 can also be a coating layer, which is attached to the surface of the heat exchange assembly 2 through intermolecular forces or other means.

[0304] In some embodiments, the rigid member 22 is connected to at least two battery cells 1, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and the heat insulation member 210 is disposed on the bottom side X2 of the flexible member 21.

[0305] In this embodiment, the rigid member 22 is connected to at least two battery cells 1. The rigid member 22 has relatively higher strength and can withstand the load from the battery cells 1. Moreover, the rigid member 22 can exchange heat with the battery cells 1 through thermal conduction, which is beneficial for maintaining good heat exchange efficiency and regulating the temperature of the battery cells 1. The flexible member 21 is connected to the bottom side X2 of the rigid member 22. The flexible member 21 does not contact the battery cells 1, which can prevent the battery cells 1 from squeezing the flexible member 21. A heat insulation member 210 is provided on the bottom side X2 of the flexible member 21. The heat insulation member 210 can isolate the flexible member 21 from the environment to a certain extent and reduce the heat transfer between the flexible member 21 and the environment.

[0306] In some embodiments, the thermal insulation element 210 is hot-pressed onto the bottom side X2 of the flexible element 21.

[0307] The insulation component 210 is connected to the flexible component 21 by a hot pressing process. The hot pressing process is a processing method that combines heating and pressurization. The insulation component 210 and / or the flexible component 21 are softened by heat energy and shaped by mechanical pressure, ultimately achieving the combination of the insulation component 210 and the flexible component 21.

[0308] In this embodiment, the insulation component 210 is connected to the flexible component 21 by a hot pressing process, which can adapt to situations where the flexible component 21 and / or the insulation component 210 have complex shapes, and is beneficial to shorten the production cycle.

[0309] In some embodiments, please refer to Figure 2 , Figure 14 and Figure 15 An insulating element 2100 is provided between the heat exchange component 2 and at least two battery cells 1.

[0310] An insulating member 2100 is disposed between the heat exchange assembly 2 and at least two battery cells 1. For example, the insulating member 2100 is disposed on the top side X1 of the heat exchange assembly 2.

[0311] Insulator 2100 is a structure that provides insulation.

[0312] In this embodiment, the side of the heat exchange component 2 closest to the battery cell 1 is likely to come into contact with the battery cell 1 or needs to come into contact with the battery cell 1. The insulating component 2100 is located between the battery cell 1 and the heat exchange component 2, which can prevent electrical conduction between the battery cell 1 and the heat exchange component 2 and improve safety.

[0313] In some embodiments, please refer to Figure 14 and Figure 15 The insulating element 2100 is disposed on the top surface of the heat exchange assembly 2.

[0314] The top surface of the heat exchange component 2 is the surface of the heat exchange component 2 facing the battery cell 1.

[0315] In this embodiment, the insulating component 2100 is disposed on the top surface of the heat exchange assembly 2. The heat exchange assembly 2 can provide an installation position for the insulating component 2100. The insulating component 2100 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.

[0316] In some embodiments, please refer to Figure 14 The insulating element 2100 is coated on the top surface of the heat exchange assembly 2. That is to say, the insulating element 2100 can be a coating structure.

[0317] The specific method of coating the insulating component 2100 is not limited. For example, the coating methods of the insulating component 2100 include, but are not limited to, spraying, brushing, or rolling.

[0318] The insulating component 2100 includes, but is not limited to, insulating varnish. Exemplarily, 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 top surface of the heat exchange assembly 2 by coating.

[0319] In this embodiment, the insulating component 2100 is coated on the top surface of the heat exchange component 2. The insulating component 2100 and the top 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 component 2100 falling off the top surface of the heat exchange component 2.

[0320] In some embodiments, the insulating element 2100 is bonded to the top surface of the heat exchange assembly 2.

[0321] Insulator 2100 can be a separately manufactured membrane structure; please refer to [reference needed]. Figure 15 The insulating component 2100 can be bonded to the top surface of the heat exchange assembly 2 via the adhesive layer 2200, wherein the adhesive layer 2200 can be made of glue, double-sided tape or other adhesive substances.

[0322] The insulating component 2100 includes, but is not limited to, an insulating film. Exemplarily, 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 top surface of the heat exchange assembly 2 by adhesive bonding.

[0323] In some examples, the insulating element 2100, such as an insulating film, can also be fixed to the top surface of the heat exchange assembly 2 by hot pressing.

[0324] In this embodiment, the insulating component 2100 can be manufactured independently and then assembled onto the top 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.

[0325] In some embodiments, the insulating element 2100 has a layered structure and can cover all or part of the top surface of the heat exchange assembly 2.

[0326] As an example, the insulating element 2100 can be a single-layer or multi-layered structure.

[0327] In embodiments where the insulating element 2100 is a single-layer layered structure, the insulating element 2100 may be made of non-metallic materials.

[0328] In embodiments where the insulating component 2100 has a multi-layered structure, the insulating component 2100 may be a composite structure with insulating properties, such as aluminum-plastic film.

[0329] In some embodiments, the rigid member 22 is connected to the top side X1 of the flexible member 21, the insulating member 2100 is disposed on the top surface of the rigid member 22, and at least two battery cells 1 are connected to the insulating member 2100.

[0330] The method by which at least two battery cells 1 are connected to the insulating component 2100 is not limited. For example, the battery cells 1 and the insulating component 2100 can be bonded together with thermally conductive structural adhesive. In this example, since the insulating component 2100 has an insulating function, the insulation performance requirements of the thermally conductive structural adhesive are relatively low, which can expand the selection range of thermally conductive structural adhesives.

[0331] At least two battery cells 1 are connected to the insulator 2100. There may be two, three or more battery cells 1 connected to the insulator 2100. For example, all battery cells 1 are connected to the insulator 2100.

[0332] In this embodiment, the rigid member 22 provides support to support the battery cell 1 and the insulating member 2100. The insulating member 2100 isolates the rigid member 22 and the battery cell 1, thus preventing electrical conductivity between the battery cell 1 and the heat exchange assembly 2. The flexible member 21 is connected to the bottom side X2 of the rigid member 22. The flexible member 21 does not contact the battery cell 1, thus preventing the battery cell 1 from squeezing the flexible member 21.

[0333] In some embodiments, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and the surface of the rigid member 22 facing the battery cell 1 is completely covered by the insulating member 2100. At least two battery cells 1 can be bonded to the insulating member 2100 by thermally conductive structural adhesive. A reinforcing member 201 is disposed between any two adjacent layers inside the flexible member 21. The reinforcing member 201 is mesh-like, and a heat-insulating member 210 is disposed on the surface of the flexible member 21 away from the rigid member 22. The heat-insulating member 210 is attached to the bottom surface of the flexible member 21.

[0334] In some embodiments, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and the surface of the rigid member 22 facing the battery cell 1 is completely covered by the insulating member 2100. At least two battery cells 1 can be bonded to the insulating member 2100 by thermally conductive structural adhesive. A reinforcing member 201 is disposed on the outer surface of the flexible member 21 away from the rigid member 22. The reinforcing member 201 is mesh-like, and a heat-insulating member 210 is disposed on the surface of the reinforcing member 201 away from the flexible member 21. The heat-insulating member 210 is attached to the bottom surface of the reinforcing member 201.

[0335] In some embodiments, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and the surface of the rigid member 22 facing the battery cell 1 is completely covered by the insulating member 2100. At least two battery cells 1 can be bonded to the insulating member 2100 by thermally conductive structural adhesive. A reinforcing member 201 is disposed on the outer surface of the flexible member 21 away from the rigid member 22. The reinforcing member 201 and the flexible member 21 together define a buffer cavity 2b. A heat insulation member 210 is disposed on the surface of the reinforcing member 201 away from the flexible member 21. The heat insulation member 210 is spaced apart from the bottom surface of the reinforcing member 201 to form a heat insulation cavity 210a.

[0336] It should be noted that those skilled in the art can, based on the embodiments of this application, provide one or more of the insulating component 2100, reinforcing component 201 and heat insulation component 210 on the heat exchange component 2, and combine different structures as needed, which will not be elaborated here.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] 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.

[0344] In some embodiments, the flexible element 21 is in the form of a single-layer or multi-layer film.

[0345] In some embodiments, the flexible element 21 includes a metallized film.

[0346] Here, the metal plastic film is a metal-plastic composite material, which includes a metal layer 211 and a plastic layer.

[0347] 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.

[0348] In some embodiments, the flexible element 21 includes an aluminum-plastic film.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] For example, the metal layer 211 and the non-metal layer 212 can be formed by hot pressing or hot melting.

[0353] Here, the number of metal layers 211 and non-metal layers 212 is not limited.

[0354] In this embodiment, the flexible component 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 component 21 and the rigid component 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.

[0355] 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.

[0356] In other words, the non-metallic layer 212 is located between the metallic layer 211 and the rigid member 22.

[0357] 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.

[0358] In some embodiments, the metal layer 211 includes one or more of aluminum foil, copper foil, and steel foil.

[0359] 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.

[0360] In some embodiments, the non-metallic layer 212 includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0361] 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.

[0362] 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.

[0363] In some embodiments, the non-metallic layer 212 is a hot-melt layer.

[0364] 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.

[0365] In some embodiments, the thickness of the flexible element 21 is 0.05mm-0.3mm.

[0366] 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, or any combination thereof.

[0367] In this embodiment, by setting the thickness of the flexible component 21 to 0.05mm-0.3mm, 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.

[0368] In some embodiments, the thickness of the flexible element 21 is 0.08 mm to 0.2 mm.

[0369] 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.

[0370] 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.

[0371] In some embodiments, the elastic modulus of the flexible element 21 is 0.1 MPa-10000 MPa.

[0372] 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.

[0373] 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.

[0374] In some embodiments, the rigid member 22 is a metal plate.

[0375] For example, it could be an aluminum alloy.

[0376] 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.

[0377] 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.

[0378] Multiple sub-channels are connected to form medium channel 2a.

[0379] 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.

[0380] 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.

[0381] 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 2 to 5 , Figure 6 , Figure 10 and Figure 14 The battery device 100 provided in this application embodiment includes at least two battery cells 1, a heat exchange assembly 2, and a housing 3. The at least two battery cells 1 are disposed within the housing 3. The heat exchange assembly 2 is integrated into the housing 3 and is disposed on the bottom side (X2) of the at least two battery cells 1. 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. The medium flow channel 2a is used to conduct heat exchange medium, which is used to exchange heat with the at least two battery cells 1. The flexible element 21 is disposed on the bottom side (X2) of the rigid element 22. The surface of the rigid element 22 facing the battery cells 1 is completely covered by an insulating element 2100. The at least two battery cells 1 can be bonded to the insulating element 2100 using a thermally conductive structural adhesive. A reinforcing member 201 is provided between any two adjacent layers inside the flexible member 21. The reinforcing member 201 is mesh-like. A heat-insulating member 210 is provided on the surface of the flexible member 21 away from the rigid member 22. The heat-insulating member 210 is attached to the bottom surface of the flexible member 21.

[0382] In this embodiment, the heat exchange component 2 is used to exchange heat with the battery cell 1. By configuring the heat exchange component 2 to include a flexible component 21 and a rigid component 22, the lighter weight of the flexible component 21 helps reduce the weight of the heat exchange component 2, lowers its production cost, and also helps reduce the weight of the battery device 100. The flexible component 21 and the rigid component 22 are stacked to form at least one medium flow channel 2a. The rigid component 22 can support the flexible component 21, which helps improve the overall structural strength and stability of the heat exchange component 2 and enhances its applicability. The heat exchange component 2 is disposed on the bottom side X2 of at least two battery cells 1. Since the rigid component 22 can improve the structural strength of the heat exchange component 2, it can provide more stable support for the battery cells 1, allowing the heat exchange component 2 to better support the battery cells 1. The heat exchange component 2 is integrated into the housing 3. The heat exchange component 2 is connected to the housing 3 or can be part of the structure of the housing 3. The housing 3 can provide support for the heat exchange component 2, which helps improve the overall structural strength and stability of the battery device 100. Rigid member 22 provides support to support the battery cell 1 and insulation member 2100. Insulation member 2100 isolates rigid member 22 and battery cell 1, preventing electrical conductivity between battery cell 1 and heat exchange assembly 2. Flexible member 21 connects to the bottom side X2 of rigid member 22. Flexible member 21 does not contact battery cell 1, preventing battery cell 1 from squeezing flexible member 21. Reinforcing member 201 provides impact resistance, improving the impact resistance of flexible member 21 and reducing the risk of deformation or damage from impact. Insulation member 210 better isolates flexible member 21 from the environment, increases the thermal resistance of flexible member 21, thereby reducing heat exchange between flexible member 21 and the environment, reducing heat diffusion from flexible member 21 to the environment, and improving the insulation performance of flexible member 21.

[0383] 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: At least two battery cells; A heat exchange assembly is disposed on the bottom side of the at least two battery cells. The heat exchange assembly includes at least two heat exchange elements, at least one of 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.

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

3. The battery device according to claim 2, characterized in that, The enclosure includes a main body with an opening at the bottom. A rigid member closes the bottom opening of the main body to define a receiving cavity. At least two battery cells are located within the receiving cavity. A flexible member connects to the bottom of the rigid member.

4. The battery device according to claim 3, characterized in that, The rigid component includes a clearance area and a main body area. The clearance area surrounds the outer periphery of the main body area and has a projection plane perpendicular to the top and bottom directions. The projection of the flexible component is located within the projection range of the main body area. The flexible component and the main body area define the medium flow channel. The clearance area is connected to the main body of the box.

5. The battery device according to claim 4, characterized in that, The clearance area is welded to the main body of the box or connected by fasteners.

6. The battery device according to claim 1, characterized in that, The flexible member is provided with at least one reinforcing member inside and / or outside.

7. The battery device according to claim 6, characterized in that, Both the reinforcing member and the flexible member are layered structures, with the reinforcing member stacked on the outer surface of the flexible member along the stacking direction or between two adjacent layers inside the flexible member.

8. The battery device according to claim 7, characterized in that, The reinforcing member is mesh-like.

9. The battery device according to claim 7, characterized in that, The reinforcing element is made of one or more of fiber, polyethylene terephthalate, and polyimide.

10. The battery device according to claim 7, characterized in that, The reinforcing member and the flexible member together define a buffer cavity.

11. The battery device according to claim 10, characterized in that, At least one of the buffer chambers is provided with a non-Newtonian fluid.

12. The battery device according to claim 1, characterized in that, The heat exchange assembly is provided with an insulation component on the side away from the at least two battery cells.

13. The battery device according to claim 12, characterized in that, The insulation component is attached to the bottom surface of the heat exchange assembly.

14. The battery device according to claim 12, characterized in that, At least a portion of the insulation element is spaced apart from the bottom surface of the heat exchange assembly to form an insulation cavity, which is filled with gas.

15. The battery device according to claim 1, characterized in that, An insulating element is provided between the heat exchange component and the at least two battery cells.

16. The battery device according to claim 15, characterized in that, The insulating element is disposed on the top surface of the heat exchange assembly.

17. The battery device according to any one of claims 1 to 16, characterized in that, The flexible component includes a metal plasticized film.

18. The battery device according to claim 17, characterized in that, The flexible component includes an aluminum-plastic film.

19. The battery device according to any one of claims 1 to 16, characterized in that, The flexible component has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

20. The battery device according to claim 19, 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.

21. The battery device according to claim 19, characterized in that, The non-metallic layer is a hot-melt layer.

22. The battery device according to any one of claims 1 to 16, characterized in that, The thickness of the flexible component is 0.05mm-0.3mm.

23. The battery device according to claim 22, characterized in that, The thickness of the flexible component is 0.08mm-0.2mm.

24. The battery device according to any one of claims 1 to 16, characterized in that, The elastic modulus of the flexible component is 0.1 MPa-10000 MPa.

25. The battery device according to any one of claims 1 to 16, characterized in that, The rigid component is a metal plate.

26. The battery device according to any one of claims 1 to 16, characterized in that, The elongation at break of the flexible component is greater than that of the rigid component.

27. The battery device according to claim 26, 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%.

28. The battery device according to any one of claims 1 to 16, characterized in that, The elastic modulus of at least a portion of the flexible component is less than that of the rigid component.

29. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 28.

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