Battery device and electrical equipment

Abstract

The present application relates to the field of battery technology, and provides a battery device and an electrical device. The battery device includes a housing, at least two battery cells, and a heat exchange assembly. At least two battery cells are arranged in the housing; the heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part, and at least one heat exchange part is set as a rigid part. The flexible part and the rigid part are stacked to form a medium flow channel, and the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells; the flexible part is a layered structure, and the flexible part includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence; wherein the rigid part is configured as a part of the housing. The flexible part is relatively light in weight, which is conducive to reducing the weight of the heat exchange assembly. The rigid part is used to form a medium flow channel by stacking with the flexible part, and the rigid part is also used to constitute the housing, which can reduce the number of components of the battery device and is conducive to reducing the weight of the battery device.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] The battery device can be used to store or provide electrical energy. The battery device can be used in electrical equipment, for example, the battery device can be used in a vehicle, etc.

[0003] In related technologies, for example, in vehicles equipped with battery devices, the battery devices can be used to provide full or partial power. During use, the temperature of the battery cells within the battery device rises, requiring temperature control. Failure to do so can adversely affect the performance and service life of the battery device. Therefore, how to regulate the temperature of the battery cells through heat exchange assemblies and reduce their mass has become an important research topic in this field. Summary of the Invention

[0004] In view of this, the embodiments of the present application hope to provide a battery device and an electrical device, wherein the flexible part is lighter in weight, which is conducive to reducing the weight of the heat exchange component.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a battery device, comprising:

[0007] Box;

[0008] At least two battery cells are disposed in the box;

[0009] A heat exchange assembly comprising at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member, wherein the flexible member and the rigid member are stacked to form a medium flow channel, wherein the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells; the flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence;

[0010] Wherein, the rigid component is configured as a part of the box body.

[0011] In a battery device provided by an embodiment of the present application, a heat exchange assembly is configured to exchange heat with a battery cell. By configuring the heat exchange assembly to include a flexible member and a rigid member, the flexible member is lightweight, which helps reduce the mass of the heat exchange assembly, lowering the production cost of the heat exchange assembly, and reducing the weight of the battery device. The flexible member and the rigid member are stacked to form at least one medium flow channel. The rigid member provides support for the flexible member, thereby improving the overall structural strength and stability of the heat exchange assembly and enhancing its applicability. The rigid member is configured as part of the housing. That is, the rigid member is both stacked with the flexible member to form the medium flow channel and also serves to form the housing. This design reduces the number of components in the battery device and helps reduce its weight. The flexible member, composed of metal and non-metallic layers stacked in sequence, is thin and lightweight. Furthermore, by forming the medium flow channel between the flexible and rigid members, it is not affected by the extrusion process and does not need to meet high thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within, eliminating the possibility of corrosion or leakage.

[0012] In some embodiments, the flexible member is connected to a side of the rigid member away from the at least two battery cells, and the at least two battery cells are connected to the rigid member.

[0013] In this embodiment, at least two battery cells are connected to a rigid member, which provides more stable support for the battery cells. The flexible member is connected to the side of the rigid member away from the at least two battery cells, reducing the risk of the battery cells contacting and squeezing the flexible member. The rigid member has good structural strength and can withstand relatively large assembly forces while maintaining its shape.

[0014] In some embodiments, a portion of the rigid member protrudes toward a side away from the at least two battery cells to form a recessed area, and the at least two battery cells are located in the recessed area.

[0015] In this embodiment, the recessed area is helpful for limiting the position of at least two battery cells, thereby facilitating the assembly of the battery cells and the rigid component.

[0016] In some embodiments, the box body includes a box body, the rigid part includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, and takes the plane perpendicular to the top and bottom directions as the projection surface, the projection of the flexible part is located within the projection range of the main body area, the flexible part and the main body area define the medium flow channel, the avoidance area is connected to the box body, the rigid part and the box body jointly define a accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

[0017] In this embodiment, the rigid part and the box body jointly define a accommodating cavity, and at least two battery cells are located in the accommodating cavity. The rigid part is a partial side wall of the box body, which plays a role in protecting the battery cells. The size of the flexible part is smaller than that of the rigid part. The flexible part is within the range of the main area, and the flexible part is basically not in contact with the avoidance area, thereby reducing the impact on the flexible part during the assembly process of the avoidance area and the box body.

[0018] In some embodiments, the avoidance area is welded to the box body or connected to the box body by fasteners.

[0019] In this embodiment, the avoidance zone is welded to the box body. Since the projection of the flexible member is within the projection of the main body, the distance between the welding position and the flexible member is greater than zero during the welding process. The high welding temperature will not directly affect the flexible member, thereby reducing the risk of localized melting of the flexible member during the welding process. Since the projection of the flexible member is within the projection of the main body, the distance between the fastener and the flexible member is greater than zero during the fastening and assembly of the avoidance zone and the box body. The high temperature generated during the high-speed rotation of the fastener will not directly affect the flexible member, thereby reducing the risk of localized melting of the flexible member during the connection process via the fastener.

[0020] In some embodiments, the width of the avoidance zone is between 5 mm and 15 mm.

[0021] In this embodiment, the width of the avoidance zone is moderate, which not only provides sufficient space for connection with the box body to avoid the flexible parts, but also avoids occupying the area of ​​the main body zone as much as possible. The main body zone retains sufficient area to form the medium flow channel, taking into account the heat exchange requirements.

[0022] In some embodiments, the box body includes a box body and a bottom guard plate, and the box body includes:

[0023] An annular frame having a top opening and a bottom opening, wherein the rigid member is connected to the annular frame and closes the bottom opening;

[0024] The top cover closes the top opening of the annular frame. The top cover, the annular frame and the rigid member jointly define a accommodating cavity. The at least two battery cells are located in the accommodating cavity. The bottom guard plate is located on the bottom side of the flexible member and is connected to the annular frame.

[0025] In this embodiment, the annular frame and top cover can be manufactured separately and then assembled into the box body. The rigid member and the box body together define a storage cavity, in which at least two battery cells are located. The rigid member forms part of the side wall of the box body, protecting the battery cells. The bottom guard plate is located on the bottom side of the flexible member to protect the flexible member and prevent objects outside the box from contacting the flexible member.

[0026] In some embodiments, the box body includes a box body that is open toward the bottom side, the rigid member closes the bottom side opening of the box body to jointly define a receiving cavity, and the at least two battery cells are located in the receiving cavity.

[0027] In this embodiment, the rigid member closes the bottom opening of the box body, and the rigid member serves as the bottom wall of the box body, which can reduce the weight of the entire battery pack.

[0028] In some embodiments, the flexible member includes a metal plastic film.

[0029] In this embodiment, the thin and lightweight metal-plasticized film, coupled with the medium flow channel formed between the metal-plasticized film and the rigid component, is unaffected by the extrusion process and eliminates the need for strict thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly. Furthermore, the metal-plasticized film's insulating and heat-transfer medium corrosion properties reduce the likelihood of insulation failure and the risk of reaction between the heat exchange assembly and the heat transfer medium flowing within, further minimizing the possibility of heat transfer medium corrosion and leakage.

[0030] In some embodiments, the flexible member includes an aluminum-plastic film.

[0031] In this embodiment, the flexible part adopts aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the insulation and corrosion protection requirements.

[0032] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or,

[0033] The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0034] In this embodiment, by providing the metal layer with one or more of aluminum foil, copper foil, and steel foil, the flexible component can have a certain structural strength and can also provide an isolation function. By providing the non-metallic layer with one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible component can have a certain degree of waterproofing and / or resistance to corrosion by heat exchange media.

[0035] In some embodiments, the non-metallic layer is a hot-melt layer.

[0036] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0037] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0038] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while making the overall thickness of the heat exchange component smaller, which is beneficial to reducing the overall volume and weight of the battery device and increasing the energy density of the battery device.

[0039] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0040] In this embodiment, by setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength while further making the overall thickness of the heat exchange component smaller, which is beneficial to further reduce the overall volume and weight of the battery device, thereby further increasing the energy density of the battery device.

[0041] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0042] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and also have a certain deformation ability, which can improve the fit between the heat exchange component and the box body and / or battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box body and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0043] In some embodiments, the rigid member is configured as a metal plate.

[0044] In this embodiment, by setting the rigid part as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component with a certain heat exchange efficiency, the rigid part can also play a certain supporting role for the flexible part.

[0045] An embodiment of the present application further provides an electrical device comprising any one of the battery devices described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic structural diagram of a vehicle in some embodiments of the present application;

[0047] Figure 2 An exploded schematic diagram of a battery device in some embodiments of the present application;

[0048] Figure 3 for Figure 2 Explosion diagram of the heat exchange component;

[0049] Figure 4 for Figure 3 Assembly diagram of the heat exchange component;

[0050] Figure 5 Schematic diagram of the assembly of heat exchange components in other embodiments of the present application;

[0051] Figure 6 Schematic diagram of an explosion of a heat exchange assembly in some other embodiments of the present application;

[0052] Figure 7 for Figure 6 Assembly diagram of the heat exchange component in .

[0053] Description of Reference Numerals

[0054] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible part; 22, rigid part; 22a, recessed area; 221, avoidance area; 222, main body area; 23, connecting part; 3, box body; 31, annular frame; 32, top cover; 33, bottom guard plate. DETAILED DESCRIPTION

[0055] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] It should be noted that, in this application, at least two includes two and more, and a plurality includes two and more.

[0059] See also Figure 1 and Figure 2 To facilitate understanding of the battery device 100 and the electrical equipment provided in the embodiment of the present application, some basic structures of the battery cell 1, the battery device 100 and the electrical equipment provided in the embodiment of the present application are first introduced.

[0060] In the embodiment of the present application, the battery cell 1 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cell 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0062] A battery cell 1 generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. The separator is positioned between the positive and negative electrodes. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0063] 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.

[0064] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0065] As examples, the positive electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] As examples, the negative electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0069] 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.

[0070] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0071] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0072] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0073] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0074] As an example, the primary 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0075] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0076] 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 specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0077] The liquid electrolyte includes an electrolyte salt and a solvent.

[0078] 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0079] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0080] 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, or additives capable of improving certain properties 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, and additives that improve the low temperature performance of the battery cell 1.

[0081] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0082] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0083] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0084] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0085] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0086] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0087] In some embodiments, the electrode assembly is a laminate structure.

[0088] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0089] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0090] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0091] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0092] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0093] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0094] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, the battery cell 1 may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, in a non-sealed structure, the outer shell protects the electrode assembly and includes a sealing bag between the outer shell and the electrode assembly, which encapsulates the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. In a sealed structure, the outer shell encapsulates the electrode assembly, electrolyte, and other components.

[0096] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in this application.

[0097] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0098] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0099] In some embodiments, a pressure relief mechanism is provided on the housing to discharge the internal gas of the battery cell 1 .

[0100] For example, when the internal pressure or temperature of a battery cell 1 reaches a predetermined threshold, the pressure relief mechanism activates to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 1 reaches the predetermined threshold, the pressure relief mechanism activates or a weakened structure within the pressure relief mechanism is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell 1.

[0101] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0102] As an example, the pressure relief mechanism may also be provided separately from and connected to the housing.

[0103] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The action produced by the pressure relief mechanism may include but is not limited to: the movement of components in the pressure relief mechanism to form an exhaust channel, at least a part of the pressure relief mechanism rupturing, breaking, tearing or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell 1 can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0104] 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 from the interior of the battery cell 1 .

[0105] The emissions from the battery cell 1 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gas generated by the reaction, flames, etc.

[0106] The battery device 100 provided in the embodiment of the present application includes the battery cell 1 in any one of the embodiments of the present application.

[0107] The battery apparatus 100 mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include a plurality of battery cells 1 .

[0108] Multiple battery cells 1 can be connected in series, in parallel or in mixed series via a busbar component. The busbar component is used to achieve electrical connection between at least two battery cells 1.

[0109] For example, hybrid means that at least two battery cells 1 are connected both in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in hybrid. Of course, at least two battery cells 1 can also be connected in series, in parallel, or in hybrid to form a module, and the module can then be connected in series, in parallel, or in hybrid to form a whole.

[0110] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 1 .

[0111] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 1 with a cable tie.

[0112] In some embodiments, the battery device 100 may be a battery pack.

[0113] See also Figure 2 The battery device 100 may include a box body 3 . As an example, the battery cell assembly may be a battery module. The battery cell assembly may be accommodated in the box body 3 by fixing the battery module in the box body 3 .

[0114] As an example, the battery cell assembly may also be housed in the box body 3 by directly fixing the plurality of battery cells 1 to the box body 3 .

[0115] In some embodiments, the box body 3 can be used as a part of the chassis structure of the vehicle. For example, part of the box body 3 can become at least a part of the floor of the vehicle, or part of the box body 3 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0116] An embodiment of the present application provides an electric device, which includes the battery device 100 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electric energy.

[0117] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, electric tools, vehicles, ships, or spacecraft. Vehicles include battery-powered vehicles and electric cars, electric toys include battery-powered vehicle toys and electric car toys, etc. Fixed or mobile electric toys include, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0118] Energy storage devices include but are not limited to energy storage containers or energy storage cabinets, etc.

[0119] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example, that is, a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0120] Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1As shown, a battery device 100 is disposed within vehicle 1000. Battery device 100 can be disposed at the bottom of vehicle 1000 or at the front or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery device 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0121] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0122] In the related art, when a battery device is in use, the temperature of the battery cells in the battery device will rise, and the temperature of the battery cells needs to be controlled. The heat exchange component is used to exchange heat with the battery cells to regulate the temperature of the battery cells. For example, when the battery cells heat up during operation, the heat exchange component absorbs the heat of the battery cells to dissipate heat and cool the battery cells. When the external ambient temperature is low and the battery cells need to be heated, the heat exchange component releases heat to the battery cells. However, the mass of the heat exchange component is relatively large, which increases the weight of the battery device.

[0123] In view of this, an embodiment of the present application provides a battery device, comprising a housing, at least two battery cells, and a heat exchange assembly. The at least two battery cells are disposed within the housing; the heat exchange assembly comprises at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member. The flexible and rigid members are stacked to form a medium flow channel, which is used to conduct a heat exchange medium, which is used to exchange heat with the at least two battery cells. The flexible member is a layered structure, comprising a metal layer and a non-metallic layer, which are stacked in sequence. The rigid member is configured as part of the housing.

[0124] In a battery device provided by an embodiment of the present application, a heat exchange assembly is configured to exchange heat with a battery cell. By configuring the heat exchange assembly to include a flexible member and a rigid member, the flexible member is lightweight, which helps reduce the mass of the heat exchange assembly, lowering the production cost of the heat exchange assembly, and reducing the weight of the battery device. The flexible member and the rigid member are stacked to form at least one medium flow channel. The rigid member provides support for the flexible member, thereby improving the overall structural strength and stability of the heat exchange assembly and enhancing its applicability. The rigid member is configured as part of the housing. That is, the rigid member is both stacked with the flexible member to form the medium flow channel and also serves to form the housing. This design reduces the number of components in the battery device and helps reduce its weight. The flexible member, composed of metal and non-metallic layers stacked in sequence, is thin and lightweight. Furthermore, by forming the medium flow channel between the flexible and rigid members, it is not affected by the extrusion process and does not need to meet high thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within, eliminating the possibility of corrosion or leakage.

[0125] The battery device 100 provided in the embodiment of the present application is further described below with reference to the accompanying drawings. Figures 2 to 7 An embodiment of the present application provides a battery device 100 , including a box 3 , at least two battery cells 1 and a heat exchange component 2 .

[0126] At least two battery cells 1 are disposed within the housing 3. The heat exchange assembly 2 includes at least two heat exchange components, at least one of which is a flexible component 21 and at least one of which is a rigid component 22. The flexible component 21 and the rigid component 22 are stacked to form a medium flow channel 2a, which is used to conduct a heat exchange medium, which is used to exchange heat with the at least two battery cells 1. The flexible component 21 is a layered structure, including a metal layer and a non-metallic layer, which are stacked in sequence. The rigid component 22 is configured as part of the housing 3.

[0127] The box body 3 can be used to contain the battery cells 1 and other structural components, provide protection for the battery cells 1 and other structural components, and reduce the impact of foreign matter outside the box body 3 on the charging or discharging of the battery cells 1.

[0128] The flexibility of the flexible member 21 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its light weight, or it can be a property imparted to the material due to at least one of its thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the flexible member 21 can be selected to be a material that is lighter than conventional structures such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible member 21. In the embodiment of the present application, by configuring the heat exchange assembly 2 to include the flexible member 21, the weight of the heat exchange assembly 2 is reduced.

[0129] The rigidity of the rigid part 22 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its heavy mass, or a property imparted to the material due to at least one of its thickness, rigidity, strength, elastic modulus, elongation at break, etc. As an example, the material of the rigid part 22 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a structural material such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 22. In the embodiment of the present application, by configuring the heat exchange component 2 to include the rigid part 22, it can play a supporting role for the flexible part 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2.

[0130] After the rigid part 22 is manufactured and formed, that is, after plastic deformation is completed, it can basically maintain its shape without change under normal use. After the flexible part 21 is manufactured and formed, that is, after plastic deformation is completed, it can undergo elastic deformation, that is, can undergo shape change under normal use.

[0131] By configuring the heat exchange component 2 to include the flexible component 21 and the rigid component 22 , the heat exchange component 2 can be made flexible while also having a certain structural strength.

[0132] The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a. This means that the heat exchange assembly 2 forms the medium flow channel 2a between the flexible member 21 and the rigid member 22. In other words, the flexible member 21 forms at least a portion of the sidewalls of the medium flow channel 2a, and the rigid member 22 also forms at least a portion of the sidewalls of the medium flow channel 2a. The heat exchange medium flows through the medium flow channel 2a to exchange heat with the battery cell 1.

[0133] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve heat exchange effect on the battery cell 1, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a coolant as an example.

[0134] It should be noted that the specific number of the medium flow channels 2a is not limited here and can be one or more.

[0135] The heat exchange assembly 2 includes at least two heat exchange elements, that is, there are multiple heat exchange elements.

[0136] At least one heat exchange component is configured as a flexible component 21, which means that there are one or more flexible components 21. In the embodiment where multiple heat exchange components are configured as flexible components 21, the flexible components 21 may be the same or different.

[0137] At least one heat exchange element is configured as a rigid element 22, which means that there are one or more rigid elements 22. In the embodiment where multiple heat exchange elements are configured as rigid elements 22, the rigid elements 22 may be the same or different.

[0138] Exemplarily, the heat exchange assembly 2 includes two heat exchange components, one of which is a flexible component 21 and the other is a rigid component 22 .

[0139] Illustratively, the rigid member 22 is a rigid plate-shaped structure, which can support the flexible member 21 , thereby facilitating improvement of the overall structural strength and stability of the heat exchange assembly 2 .

[0140] As an example, the heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1 .

[0141] The heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1 , which means that the heat exchange assembly 2 is located on the side of the at least two battery cells 1 close to the ground.

[0142] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. Usually, the bottom side X2 faces the ground, and the top side X1 faces the sky.

[0143] The heat exchange assembly 2 is integrated into the housing 3, that is, the heat exchange assembly 2 is connected to the housing 3 or the heat exchange assembly 2 can be a part of the housing 3. In this way, the housing 3 can provide support for the heat exchange assembly 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0144] As an example, the heat exchange assembly 2 and the box body 3 can be connected by a non-detachable connection or a detachable connection.

[0145] Unless otherwise stated, in this application, non-detachable connections include but are not limited to welding and / or bonding, etc., and detachable connections include but are not limited to screw connections, bolt connections and / or clamping, etc.

[0146] As an example, the heat exchange component 2 is a part of the structure of the box body 3, which means that the heat exchange component 2 constitutes part of the side wall of the box body 3. For example, the rigid component 22 can constitute the bottom wall and / or the peripheral side wall of the box body 3, etc.

[0147] A layered structure refers to a structure in which a single layer or multiple layers are spread out in a flat or curved form, and the multiple layers can be parallel to each other or stacked regularly.

[0148] Here, the flexible member 21 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0149] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0150] Here, the number of metal layers and non-metal layers is not limited.

[0151] In the battery device 100 provided in the embodiment of the present application, the heat exchange assembly 2 is used to exchange heat with the battery cell 1. By configuring the heat exchange assembly 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 is relatively lightweight, which helps reduce the mass of the heat exchange assembly 2, reduces the production cost of the heat exchange assembly 2, and helps reduce the mass 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 assembly 2 and improves the applicability of the heat exchange assembly 2. The rigid member 22 is configured as a part of the housing 3. That is, the rigid member 22 is used to stack with the flexible member 21 to form the medium flow channel 2a, and the rigid member 22 is used to constitute the housing 3. Such a design can reduce the number of components of the battery device 100 and help reduce the weight of the battery device 100. Flexible member 21, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, the medium flow channel 2a formed between flexible member 21 and rigid member 22 is unaffected by the extrusion process and eliminates the need for high thickness requirements, thereby reducing the overall thickness and weight of heat exchange assembly 2. Furthermore, heat exchange assembly 2 does not react with the heat exchange medium flowing within, eliminating the possibility of corrosion or leakage.

[0152] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a hexahedron, a cylinder, or a sphere, or 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 rectangular parallelepiped, with both the length and width of the box 3 parallel to the horizontal plane, and the length of the box 3 is parallel to the longest side of the rectangular parallelepiped.

[0153] The material of the box body 3 is not limited. For example, the material of the box body 3 can be a metal material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0154] Exemplarily, the heat exchange assembly 2 further 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 used to connect to the pipelines of the air conditioning system or water tank of the vehicle or electrical device or a liquid storage device.

[0155] For example, see Figure 3 and Figure 6 The heat exchange component 2 further includes a connecting member 23 having an inlet and a connecting member 23 having an outlet, and the connecting member 23 is connected to the rigid member 22.

[0156] The material of the connecting member 23 includes but is not limited to metal or plastic.

[0157] For example, the connecting member 23 is connected to the rigid member 22 by soldering.

[0158] Exemplarily, the connecting member 23 is a water tap.

[0159] The principle of heat exchange component 2 for battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium exchanges heat with the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heat exchange of the battery cell 1.

[0160] Here, the heat exchange component 2 exchanges heat with the battery cell 1 to dissipate heat from the battery cell 1 or to heat the battery cell 1 .

[0161] The principle of heat dissipation of the battery cell 1 by the heat exchange component 2 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium absorbs the heat generated by the battery cell 1 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 2, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 1.

[0162] The principle of heat exchange component 2 heating battery cell 1 is as follows: the heat exchange medium output by 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. After heating the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heating of the battery cell 1.

[0163] In some embodiments, the elongation at break of the flexible component 21 is greater than the elongation at break of the rigid component 22 .

[0164] Elongation at break is the percentage of a material's elongation at break compared to its original length. It measures the material's ability to withstand deformation during stretching; in other words, elongation at break indicates the material's ability to expand when subjected to tension.

[0165] The elongation at break of the flexible part 21 is greater than the elongation at break of the rigid part 22. In other words, when subjected to tension, the ductility of the flexible part 21 is greater than the ductility of the rigid part 22, which is beneficial to improving the impact resistance, cushioning performance and puncture resistance of the heat exchange component 2.

[0166] For example, the elongation at break of the flexible member 21 and the rigid member 22 can be measured by a tensile test or a drop weight test at room temperature and pressure. The measuring instrument may include a universal testing machine.

[0167] In some embodiments, the elongation at break of the flexible member 21 is in a range of 30% to 300%.

[0168] The elongation at break of the flexible member 21 may 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 any two of them.

[0169] In this embodiment, by setting the elongation at break of the flexible member 21 to be in the range of 30% to 300%, the flexible member 21 can have certain impact resistance and puncture resistance while also having certain structural strength.

[0170] In some embodiments, the elongation at break of the rigid member 22 is in a range of 1% to 50%.

[0171] The elongation at break of the rigid member 22 may 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%, 50%, or any value therebetween.

[0172] 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, thereby facilitating improvement of the overall structural strength of the heat exchange assembly 2 .

[0173] In some embodiments, the elastic modulus of at least a portion of the flexible member 21 is smaller than the elastic modulus of the rigid member 22 .

[0174] Here, the elastic modulus of a partial area of ​​the flexible member 21 may be smaller than the elastic modulus of the rigid member 22 , or the elastic modulus of the entire area of ​​the flexible member 21 may be smaller than the elastic modulus of the rigid member 22 .

[0175] In this way, the heat exchange component 2 can be made flexible while also having a certain structural strength.

[0176] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to a certain force range. It is one of the fundamental physical quantities of a material. The larger the elastic modulus, the greater the material's stiffness and compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0177] The elastic modulus of the flexible member 21 and the rigid member 22 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0178] For example, the elastic modulus of the flexible part 21 and the rigid part 22 can be measured at room temperature and pressure by nanoindentation. The nanoindentation method 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.

[0179] For some examples, see Figure 2 and Figure 3 The flexible member 21 is connected to a side of the rigid member 22 away from at least two battery cells 1 , and the at least two battery cells 1 are connected to the rigid member 22 .

[0180] As an example, the flexible member 21 is connected to the bottom side X2 of the rigid member 22 , and the flexible member 21 is located on a side of the rigid member 22 away from the battery cell 1 .

[0181] At least two battery cells 1 are connected to the rigid member 22 . Two, three or more battery cells 1 may be connected to the rigid member 22 . Exemplarily, all battery cells 1 are connected to the rigid member 22 .

[0182] The manner of connecting the battery cell 1 and the rigid member 22 is not limited. The battery cell 1 can be connected to the rigid member 22 via a heat-conducting structure.

[0183] The thermally conductive structure is a structure made of a good thermal conductor. For example, the thermal conductivity of the thermally conductive structure is not less than 30 W / (m·K). The thermally conductive structure has excellent thermal conductivity and connection function. The thermally conductive structure can establish a heat conduction path between the rigid member 22 and the battery cell 1, improving heat exchange efficiency.

[0184] The specific material of the heat-conducting structure is not limited. For example, the heat-conducting structure includes but is not limited to heat-conducting structural adhesive and the like.

[0185] In this embodiment, at least two battery cells 1 are connected to the rigid member 22, which provides more stable support for the battery cells 1. The flexible member 21 is connected to the side of the rigid member 22 away from the at least two battery cells 1, thereby reducing the risk of the battery cells 1 contacting and squeezing the flexible member 21. The rigid member 22 has good structural strength and can withstand relatively large assembly forces while maintaining its shape.

[0186] For some examples, see Figure 3 The rigid member 22 may be a flat plate structure with both sides thereof being flat along the thickness direction.

[0187] In this embodiment, the rigid member 22 has a simple structure and is easy to manufacture and form. For example, the rigid member 22 can be formed by a process such as extrusion.

[0188] For some examples, see Figure 2 and Figure 6 Part of the rigid member 22 protrudes toward a side away from the at least two battery cells 1 to form a recessed area 22 a , and the at least two battery cells 1 are located in the recessed area 22 a .

[0189] As an example, a portion of the rigid member 22 protrudes toward the bottom side X2 to form a recessed area 22 a .

[0190] Illustratively, at least two battery cells 1 may be bonded to the top surface of the recessed area 22 a .

[0191] In this embodiment, the recessed area 22 a is helpful for limiting the position of at least two battery cells 1 , thereby facilitating the assembly between the battery cells 1 and the rigid member 22 .

[0192] In some embodiments, the flexible member 21 may also be connected to the top side X1 of the rigid member 22, and the flexible member 21 may abut the battery cell 1. The flexible member 21 has a certain degree of flexibility, which allows for better fit with the battery cell 1, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly 2. This eliminates or minimizes the use of caulking agent or thermally conductive material between the flexible member 21 and the battery cell 1, thereby improving the fit between the heat exchange assembly 2 and the battery cell 1 and thereby enhancing the heat exchange effect of the heat exchange assembly 2.

[0193] For some examples, see Figures 2 to 7 The box body 3 includes a box body, the rigid part 22 includes an avoidance area 221 and a main body area 222, the avoidance area 221 surrounds the outer periphery of the main body area 222, and takes the plane perpendicular to the top and bottom direction X as the projection surface. The projection of the flexible part 21 is located within the projection range of the main body area 222. The flexible part 21 and the main body area 222 define a medium flow channel 2a. The avoidance area 221 is connected to the box body, and the rigid part 22 and the box body jointly define a accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity.

[0194] The avoidance zone 221 surrounds the outer periphery of the main body zone 222 . The avoidance zone 221 may be substantially annular and surround the main body zone 222 .

[0195] Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is located within the projection range of the main area 222 , that is, the projection of the flexible member 21 does not overlap with the projection of the avoidance area 221 . In other words, the projection of the avoidance area 221 surrounds the projection of the flexible member 21 .

[0196] In this embodiment, the rigid part 22 and the box body jointly define a accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity. The rigid part 22 is a partial side wall of the box body 3, which plays a role in protecting the battery cells 1. The size of the flexible part 21 is smaller than that of the rigid part 22. The flexible part 21 is within the range of the main body area 222, and the flexible part 21 is basically not in contact with the avoidance area 221, thereby reducing the impact on the flexible part 21 during the assembly process of the avoidance area 221 and the box body.

[0197] For some examples, see Figure 4 and Figure 5 The rigid member 22 may be a flat plate structure with both sides being flat along the thickness direction, and the rigid member 22 may be virtually divided into an avoidance area 221 and a main body area 222 by a dotted line L or a solid line.

[0198] For some examples, see Figure 6 and Figure 7 The main body area 222 can be a recessed area 22a. That is, with the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the recessed area 22a coincides with the projection of the main body area 222. The main body area 222 and the avoidance area 221 form a stepped structure along the thickness direction of the rigid member 22. In this way, the main body area 222 and the avoidance area 221 can have a significant difference in shape.

[0199] In some cases, the box and the heat exchange component are connected by welding. Taking stir friction welding as an example, the temperature of stir friction welding is relatively high and may be much higher than the melting point of the flexible part. For example, the melting point of the flexible part may be between 140°C and 180°C, which may cause the high-temperature melting of the flexible part formed by welding.

[0200] In some embodiments, the avoidance area 221 is welded to the box body. Figure 4 , Figure 4 The avoidance area 221 in the middle is used for welding.

[0201] As an example, the avoidance area 221 and the tank body may be welded by friction stir welding (FSW).

[0202] In one example, the width of the avoidance area 221 is between 5 mm and 15 mm, and the size of the welding area can be between 3 mm and 8 mm.

[0203] In this embodiment, the avoidance area 221 is welded to the box body. Since the projection of the flexible part 21 is located within the projection range of the main area 222, during the welding process of the avoidance area 221 and the box body, the distance between the welding position and the flexible part 21 is greater than zero, and the high welding temperature will not directly act on the flexible part 21, thereby reducing the risk of local melting of the flexible part 21 during the welding process.

[0204] It should be noted that the unit "°C" is degrees Celsius.

[0205] In some cases, the box body and the heat exchange assembly 2 are connected by screws, and the high temperature caused by the high-speed rotation of the screws may also melt the flexible part 21.

[0206] In some embodiments, the avoidance area 221 is connected to the box body by fasteners. Figure 5 , Figure 5 The avoidance area 221 in the embodiment is used for fastener connection.

[0207] Fasteners include but are not limited to screws or bolts, etc.

[0208] In one example, the width of the avoidance zone 221 is between 5 mm and 10 mm.

[0209] As an example, the avoidance area 221 and the box body can be connected by fasteners using a flow drill screw process (Flow Drill Screw, ‌FDS).

[0210] In this embodiment, since the projection of the flexible part 21 is located within the projection range of the main body area 222, during the fastening and assembly process of the avoidance area 221 and the box body, the distance between the fastener and the flexible part 21 is greater than zero, and the high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible part 21, thereby reducing the risk of local melting of the flexible part 21 during the connection process through the fastener.

[0211] In some embodiments, the width of the avoidance zone 221 is between 5 mm and 15 mm. Preferably, the width of the avoidance zone 221 is between 10 mm and 15 mm.

[0212] Exemplarily, the width dimension of the avoidance zone 221 is 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 any value therebetween.

[0213] The width of the avoidance area 221 refers to the distance between the boundary line between the avoidance area 221 and the main area 222 and the edge line of the avoidance area 221 .

[0214] In this embodiment, the width of the avoidance area 221 is moderate, which not only provides sufficient space for connection with the box body 3 to avoid the flexible part 21, but also avoids occupying the area of ​​the main body area 222 as much as possible. The main body area 222 retains sufficient area to form the medium flow channel 2a, taking into account the heat exchange requirements.

[0215] It should be noted that the unit "mm" is millimeter.

[0216] For some examples, see Figure 2 and Figure 3 The box body 3 includes a box body and a bottom guard plate 33. The box body includes an annular frame 31 and a top cover 32. The annular frame 31 has a top opening and a bottom opening. The rigid member 22 is connected to the annular frame 31 and closes the bottom opening; the top cover 32 closes the top opening of the annular frame 31; the top cover 32, the annular frame 31 and the rigid member 22 jointly define an accommodating cavity, in which at least two battery cells 1 are located; the bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 is connected to the annular frame 31.

[0217] As an example, the rigid member 22 may be welded to the annular frame 31 or connected to the annular frame 31 by fasteners.

[0218] The annular frame 31 may be a square ring, a rectangular ring or other ring shapes. In some embodiments, the annular frame 31 may include four side plates, which may be extruded plate-shaped profiles. The four side plates are welded in sequence along the circumference to form the annular frame 31.

[0219] The accommodating cavity can be a sealed space or a non-sealed space.

[0220] The top cover 32 may be welded to the annular frame 31 or connected to the annular frame 31 by fasteners.

[0221] The bottom guard plate 33 may be welded to the annular frame 31 or connected to the annular frame 31 by fasteners.

[0222] In this embodiment, the annular frame 31 and top cover 32 can be manufactured separately and then assembled into the box body. The rigid member 22 and the box body together define a accommodating cavity, in which at least two battery cells 1 are located. The rigid member 22 forms part of the side wall of the box body 3 and serves to protect the battery cells 1. The bottom guard plate 33 is located on the bottom side of the flexible member 21 and protects the flexible member 21 by preventing objects outside the box body 3 from contacting the flexible member 21.

[0223] In some embodiments, the box body 3 includes a box body that is open to the bottom side. The heat exchange assembly 2 closes the bottom side opening of the box body to jointly define an accommodating cavity. At least two battery cells 1 are located in the accommodating cavity.

[0224] As an example, a bottom guard plate 33 may be provided on the bottom side X2 of the heat exchange assembly 2 , and the bottom guard plate 33 is connected to the box body. In this way, the bottom guard plate 33 may protect the flexible member 21 .

[0225] As an example, a portion of the rigid member 22 protrudes toward the bottom side X2 to form a recessed area 22a, 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 relatively buckled to define a receiving cavity.

[0226] The recessed area 22a may be formed by the plate-shaped rigid member 22 through a stamping process.

[0227] In this embodiment, the heat exchange assembly 2 closes the bottom opening of the box body, and the rigid member 22 serves as the bottom wall of the box body 3, which can reduce the weight of the entire package of the battery device 100.

[0228] In some embodiments, the flexible member 21 and the rigid member 22 are hot pressed to form a hot pressing area and a medium flow channel 2 a , and the flexible member 21 and the rigid member 22 are connected to each other in at least a portion of the hot pressing area.

[0229] That is, the flexible member 21 and the rigid member 22 are connected by hot pressing, and the hot pressing area and the medium flow channel 2 a are formed by hot pressing. This molding method is simple.

[0230] Here, the flexible member 21 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 2 has good sealing performance and is not prone to cracking.

[0231] In this embodiment, the flexible member 21 is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the heat exchange component 2 to form at least one medium flow channel 2a. This molding method is simple.

[0232] Illustratively, the hot pressing area includes a heat-sealing area and a non-heat-sealing area. The non-heat-sealing area and the medium flow channel 2a are located on either side of the heat-sealing area, respectively. This helps reduce the width of the heat-sealing area, thereby alleviating the problem of excessively high temperatures caused by an overly wide heat-sealing area, which can affect the quality of hot pressing and damage the flexible member 21. Furthermore, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 21 is folded, thereby alleviating the problem of stress concentration in the heat-sealing area leading to damage to the heat-sealing area.

[0233] In related technologies, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. However, due to the high alloy content of high-strength aluminum alloy (5 series, 6 series, etc.), alloy elements will precipitate during welding, affecting the welding quality.

[0234] In the embodiment of the present application, the heat exchange component 2 is configured to include a flexible part 21 and a rigid part 22, and the flexible part 21 and the rigid part 22 are hot pressed to form a hot pressing area and a medium flow channel 2a. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 2.

[0235] In some embodiments, the flexible member 21 is in the form of a single-layer or multi-layer film.

[0236] In some embodiments, the flexible member 21 includes a metal plastic film.

[0237] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0238] In this embodiment, the thin and lightweight metal plasticized film, coupled with the medium flow channel 2a formed between the metal plasticized film and the rigid member 22, is unaffected by the extrusion process and eliminates the need for high thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly 2. Furthermore, the metal plasticized film's insulating and heat medium corrosion resistance reduces the likelihood of insulation failure and the risk of reaction between the heat exchange assembly 2 and the heat medium flowing therein, further minimizing the possibility of corrosion and leakage of the heat exchange medium.

[0239] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0240] In this embodiment, the flexible member 21 is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, meeting insulation and corrosion protection requirements.

[0241] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer and a non-metal layer, which are stacked in sequence, wherein the non-metal layer is arranged on the side of the metal layer facing the rigid member 22 .

[0242] That is, the non-metallic layer is located between the metal layer and the rigid member 22 .

[0243] Here, by arranging the non-metallic layer on the side of the metal layer facing the rigid component 22 , the non-metallic layer can be connected to the rigid component 22 through hot pressing.

[0244] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0245] In this embodiment, by setting the metal layer to one or more of aluminum foil, copper foil and steel foil, the flexible member 21 can have a certain structural strength and can play an isolation role.

[0246] In some embodiments, the non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0247] In this embodiment, by setting the non-metallic layer to one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 21 can have a certain waterproof effect and / or resistance to corrosion by heat exchange media.

[0248] For example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0249] In some embodiments, the non-metallic layer is a hot-melt layer.

[0250] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0251] In some embodiments, the thickness of the flexible member 21 is 0.05 mm-0.3 mm.

[0252] Exemplarily, the thickness of the flexible member 21 is any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, and 0.3 mm, or any value between any two of them.

[0253] In this embodiment, by setting the thickness of the flexible part 21 to 0.05mm-0.3mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength while making the overall thickness of the heat exchange component 2 smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0254] In some embodiments, the thickness of the flexible member 21 is 0.08 mm-0.2 mm.

[0255] Exemplarily, the thickness of the flexible member 21 is any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, and 0.2 mm, or any value between any two of them.

[0256] In this embodiment, by setting the thickness of the flexible part 21 to 0.08mm-0.2mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength, while further making the overall thickness of the heat exchange component 2 smaller, 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.

[0257] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa-10000 MPa.

[0258] Exemplarily, the elastic modulus of the flexible part 21 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0259] In this embodiment, by setting the elastic modulus of the flexible part 21 to 0.1MPa-10000MPa, the flexible part 21 has a certain structural strength, thereby improving the reliability of the heat exchange component 2, and has a certain deformation ability, which can improve the fit between the heat exchange component 2 and the box body 3 and / or the battery cell 1, thereby increasing the effective heat exchange area between the heat exchange component 2 and the box body 3 and / or the battery cell 1, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 2.

[0260] In some embodiments, the rigid member 22 is configured as a metal plate.

[0261] For example, it may be an aluminum alloy.

[0262] In this embodiment, by setting the rigid part 22 as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component 2 with a certain heat exchange efficiency, the rigid part 22 can also play a certain supporting role for the flexible part 21.

[0263] In some embodiments, the medium flow channel 2 a includes a plurality of sub-flow channels, each battery cell 1 corresponds to a plurality of sub-flow channels, and an extension direction of the sub-flow channels corresponding to the battery cell 1 is perpendicular to the length direction of the battery cell 1 .

[0264] The plurality of sub-flow channels are connected to form a medium flow channel 2a.

[0265] The extension direction of the sub-flow channels is perpendicular to the length direction of the battery cell 1 , that is, the multiple sub-flow channels are arranged along the length direction of the battery cell 1 , so that the length direction of the battery cell 1 corresponds to the multiple sub-flow channels.

[0266] 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 corresponding each battery cell 1 to multiple sub-flow channels, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0267] The battery device 100 provided in the embodiment of the present application is further described below with a specific embodiment. Figures 2 to 4 The battery device 100 includes a housing 3, at least two battery cells 1, and a heat exchange assembly 2. The at least two battery cells 1 are disposed within the housing 3; the heat exchange assembly 2 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 components, at least one of which is a flexible component 21, and at least one of which is a rigid component 22. The flexible component 21 and the rigid component 22 are stacked to form a medium flow channel 2a. The medium flow channel 2a is used to conduct a heat exchange medium, which is used to exchange heat with the at least two battery cells 1. The rigid component 22 is integrated into the housing 3, and the flexible component 21 is connected to the bottom side X2 of the rigid component 22. The at least two battery cells 1 are connected to the rigid component 22. The rigid part 22 includes an avoidance area 221 and a main body area 222. The avoidance area 221 surrounds the outer periphery of the main body area 222, with the plane perpendicular to the top and bottom direction X as the projection surface. The projection of the flexible part 21 is located within the projection range of the main body area 222. The flexible part 21 and the main body area 222 define a medium flow channel 2a, and the avoidance area 221 is connected to the box body 3.

[0268] In this embodiment, the heat exchange assembly 2 is used to exchange heat with the battery cells 1. By configuring the heat exchange assembly 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 is lightweight, which helps reduce the mass of the heat exchange assembly 2, lowers the production cost of the heat exchange assembly 2, and helps reduce the mass of the battery device 100. The rigid member 22 can enhance the structural strength of the heat exchange assembly 2, allowing the heat exchange assembly 2 to better support the battery cells 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 supports the flexible member 21, which helps improve the overall structural strength and stability of the heat exchange assembly 2 and enhances the applicability of the heat exchange assembly 2. At least two battery cells 1 are connected to the rigid member 22, which can more stably support the battery cells 1. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, which reduces the risk of the battery cells 1 contacting and squeezing the flexible member 21 to a certain extent. The rigid member 22 has excellent structural strength and can withstand relatively large assembly forces while maintaining its shape. Integrating the rigid member 22 into the housing 3 allows the heat exchange assembly 2 to be securely assembled to the housing 3 with minimal damage. The flexible member 21 is smaller than the rigid member 22. Within the main body region 222, the flexible member 21 has substantially no contact with the escape region 221, thereby minimizing any impact on the flexible member 21 during assembly of the escape region 221 with the housing 3.

[0269] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery device, characterized in that: include: Box; At least two battery cells are disposed in the box; A heat exchange assembly comprising at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member, wherein the flexible member and the rigid member are stacked to form a medium flow channel, wherein the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells; the flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence; In which, the rigid member is configured as a part of the box body, the box body includes a box body, the rigid member includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, and takes the plane perpendicular to the top and bottom directions as the projection surface, the projection of the flexible member is located within the projection range of the main body area, the flexible member and the main body area define the medium flow channel, the avoidance area is connected to the box body, the rigid member and the box body jointly define a accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

2. The battery device according to claim 1, wherein: The flexible member is connected to a side of the rigid member away from the at least two battery cells, and the at least two battery cells are connected to the rigid member.

3. The battery device according to claim 2, characterized in that A portion of the rigid member protrudes toward a side away from the at least two battery cells to form a recessed area, and the at least two battery cells are located in the recessed area.

4. The battery device according to claim 1, wherein: The avoidance area is welded to the box body or connected with fasteners.

5. The battery device according to claim 1, wherein: The width of the avoidance zone is between 5 mm and 15 mm.

6. The battery device according to claim 1, wherein: The box body includes a box body and a bottom guard plate, and the box body includes: An annular frame having a top opening and a bottom opening, wherein the rigid member is connected to the annular frame and closes the bottom opening; The top cover closes the top opening of the annular frame. The top cover, the annular frame and the rigid member jointly define a accommodating cavity. The at least two battery cells are located in the accommodating cavity. The bottom guard plate is located on the bottom side of the flexible member and is connected to the annular frame.

7. The battery device according to claim 1, wherein: The box body includes a box body, the box body is open toward the bottom side, the rigid member closes the bottom side opening of the box body to jointly define an accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

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

9. The battery device according to claim 8, characterized in that The flexible member comprises an aluminum-plastic film.

10. The battery device according to claim 1, wherein: 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.

11. The battery device according to claim 1, wherein: The non-metallic layer is a hot-melt layer.

12. The battery device according to any one of claims 1 to 7, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

13. The battery device according to claim 12, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

14. The battery device according to any one of claims 1 to 7, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

15. The battery device according to any one of claims 1 to 7, characterized in that: The rigid member is configured as a metal plate.

16. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 15.

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