Battery device, heat exchange assembly and electric device

Abstract

The application relates to the technical field of batteries, and provides a battery device, a heat exchange assembly and a power utilization equipment. The battery device comprises a heat exchange assembly and at least two battery monomers; the heat exchange assembly is arranged at at least one end of the battery monomers in a first direction, and a first phase change structure is arranged in the heat exchange assembly; the first phase change structure comprises a framework and a first phase change material, the first phase change material is arranged on the framework, and the framework comprises a foamed metal. The first phase change material can change phase, the framework is a structure with pores, the framework remains unchanged in shape during the phase change of the first phase change material, and since the first phase change material is likely to expand in volume when melting, the pores of the framework are used to bear the first phase change material, the problem of "easy expansion and leakage" of the first phase change material is solved, and the heat storage density of the first phase change material is increased. The first phase change structure can change phase at constant temperature and latent heat, and the temperature control effect is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, a heat exchange component, 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. Taking vehicles as an example, in a vehicle equipped with a battery device, the battery device can provide all or part of the power.

[0003] In related technologies, during the charging and discharging process of battery devices, especially under high-rate charging and discharging conditions, the individual battery cells inside the battery device will generate heat, and the individual battery cells are prone to overheating. Therefore, how to dissipate heat and cool down the individual battery cells has become an important research topic. Utility Model Content

[0004] This application provides a battery device, a heat exchange component, and an electrical device. The heat exchange component absorbs heat from the battery cells through a first phase change structure, which can improve the temperature control effect.

[0005] The technical solution of this application embodiment is implemented as follows: This application provides a battery device, the battery device comprising: At least two battery cells; A heat exchange assembly is provided at at least one end of the battery cell in a first direction, and a first phase change structure is provided inside the heat exchange assembly; The first phase change structure includes a skeleton and a first phase change material, the first phase change material being disposed on the skeleton, and the skeleton including foam metal.

[0006] The battery device provided in this application embodiment features a first phase change material capable of undergoing a phase change. The framework has a porous structure that maintains its shape during the phase change process. Since the first phase change material typically expands in volume when it melts, utilizing the pores of the framework to support it mitigates the problem of easy expansion and leakage, and also increases its heat storage density. The heat exchange component absorbs heat from the battery cells through the first phase change structure. Based on the isothermal latent heat phase change of the first phase change structure, it passively absorbs and stores heat within a relatively stable temperature range, improving temperature control. The foamed metal has a relatively high thermal conductivity and good structural support, which not only increases the heat conduction rate between the first phase change material and the battery cells, rapidly dispersing heat and reducing the risk of heat concentration and mitigating the relatively slow heat conduction of the first phase change material, but also maintains its structural shape, providing support for the first phase change material and using capillary action to lock it in, reducing the risk of leakage after complete melting.

[0007] In some embodiments, a second phase change structure is provided within the heat exchange assembly.

[0008] In this embodiment, the heat exchange component can absorb the heat of the battery cell through the first phase change structure and the second phase change structure, which can further increase the heat absorption and thus improve the heat dissipation effect.

[0009] In some embodiments, the second phase change structure and the first phase change structure are at least partially stacked.

[0010] In this embodiment, the second phase change structure and the first phase change structure can be partially or fully stacked to improve structural compactness.

[0011] In some embodiments, the heat exchange assembly forms a placement cavity, and both the first phase change structure and the second phase change structure are disposed within the placement cavity.

[0012] In this embodiment, both the first phase change structure and the second phase change structure are disposed in the placement cavity, which not only simplifies the assembly process, but also facilitates the heat transfer between the first phase change structure and the second phase change structure.

[0013] In some embodiments, the second phase change structure is a layered structure formed of a second phase change material.

[0014] In this embodiment, the second phase change structure is a layered structure formed by the second phase change material. It has a simple structure and a large heat exchange area, which is beneficial for use in combination with the first phase change structure.

[0015] In some embodiments, the heat exchange assembly has heat exchange channels for circulating heat exchange medium.

[0016] In this embodiment, the heat exchange component can exchange heat with the battery cell through the first phase change structure and the heat exchange medium. When the battery cell is at a high temperature, the temperature of the battery cell can be quickly reduced, thereby reducing the risk of overheating. The heat exchange medium can continuously flow through the heat exchange channel, and the heat exchange medium can stably remove heat, improving the continuous heat dissipation capacity.

[0017] In some embodiments, the heat exchange assembly forms a placement cavity that is isolated from the heat exchange channel, and the first phase change structure is disposed within the placement cavity.

[0018] In this embodiment, the placement cavity is isolated from the heat exchange channel. That is, the first phase change structure in the placement cavity will not enter the heat exchange channel, and the heat exchange medium in the heat exchange channel will not enter the placement cavity. In this way, the mixing of the first phase change structure and the heat exchange medium can be avoided.

[0019] In some embodiments, at least a portion of the heat exchange channel surrounds the first phase change structure.

[0020] In this embodiment, part or all of the structure of the heat exchange channel may surround the first phase change structure, which not only makes the heat exchange component structure compact, but also facilitates heat transfer between the heat exchange medium and the first phase change structure.

[0021] In some embodiments, the heat exchange channel includes: Entering the segment; At least two flow split sections, with the first phase change structure disposed between the two flow split sections; The discharge section connects the inlet section and the discharge section.

[0022] In this embodiment, the heat exchange medium entering the inlet section can be divided into multiple streams that flow into multiple branch sections, and then converged into the outlet section, from which it is discharged outside the heat exchange assembly. This multiple branch sections increase the heat exchange area and improve heat exchange efficiency. A first phase change structure is provided between two branch sections to facilitate heat exchange between the heat exchange medium within the branch sections and the first phase change structure.

[0023] In some embodiments, the heat exchange assembly includes: The first plate, wherein the battery cell is connected to the first plate; The second plate is stacked on top of the first plate, and the first plate and the second plate together define a placement cavity, in which the first phase change structure is disposed.

[0024] In this embodiment, the placement cavity is defined by the first plate and the second plate, which can better prevent the leakage of the first phase change material after melting; the battery cell is connected to the first plate, and the heat of the battery cell can be transferred to the first plate and then to the first phase change structure. The heat exchange component has a simple structure and is easy to manufacture and assemble.

[0025] In some embodiments, the second plate forms a first groove that opens toward the first plate, and the first plate closes the opening of the first groove to collectively define the placement cavity.

[0026] In this embodiment, the first phase change structure can be placed into the first groove through the opening of the first groove, and the volume of the placement cavity can be relatively large to facilitate the placement of the first phase change structure.

[0027] In some embodiments, the heat exchange assembly includes: The third plate, and the second plate forming a second groove opening toward the third plate, the third plate closing the opening of the second groove, together defining a heat exchange channel for the flow of heat exchange medium.

[0028] In this embodiment, a heat exchange channel is formed by opening a second groove on the second plate and closing the opening of the second groove with a third plate, which can reduce the difficulty of manufacturing and forming the heat exchange channel.

[0029] In some embodiments, the heat exchange component is disposed at the lower end of the battery cell in the direction of gravity.

[0030] In this embodiment, a heat exchange component is provided at the lower end of the battery cell in the direction of gravity, and the heat exchange component can provide an upward supporting force for the battery cell.

[0031] In some embodiments, the battery device includes: The housing has a receiving cavity, in which the at least two battery cells and the heat exchange assembly are disposed.

[0032] In this embodiment, the enclosure provides protection for the battery cells and heat exchange components, preventing foreign objects outside the enclosure from affecting the charging or discharging of the battery cells.

[0033] In some embodiments, the battery device includes: The first busbar is connected to the electrode terminals of the battery cell, and the first busbar is provided with the heat exchange component.

[0034] In this embodiment, the first busbar generates heat during the conduction of current, etc. The first busbar is provided with a heat exchange component, which can provide heat dissipation and cooling function for the first busbar.

[0035] In some embodiments, the battery device includes: The distribution box includes a second busbar component, which is provided with the heat exchange assembly.

[0036] In this embodiment, the second busbar generates heat during the conduction of current, etc. The second busbar is provided with a heat exchange component, which can provide heat dissipation and cooling function for the second busbar.

[0037] In some embodiments, the distribution box includes: The housing has a first opening, the second busbar is located inside the housing, and the heat exchange assembly is located outside the housing. The heat exchange assembly is connected to the second busbar through the first opening.

[0038] In this embodiment, the heat exchange component is located outside the box and does not occupy space inside the box; the heat exchange component is connected to the second busbar component through the first opening and the box does not interfere with the heat conduction between the heat exchange component and the second busbar component.

[0039] This application provides a heat exchange component, wherein a first phase change structure is disposed within the heat exchange component; the first phase change structure includes a frame and a first phase change material, wherein the first phase change material is disposed on the frame.

[0040] The heat exchange component provided in this application embodiment features a first phase change material capable of undergoing a phase change. The framework has a porous structure that maintains its shape during the phase change process. Since the first phase change material typically expands in volume when it melts, utilizing the pores of the framework to support it resolves the issue of easy expansion and leakage, and also increases its heat storage density. The heat exchange component absorbs heat from battery cells, the first busbar component, and / or the second busbar component through the first phase change structure. Based on the isothermal latent heat phase change of the first phase change structure, it passively absorbs and stores heat within a relatively stable temperature range, thus improving temperature control.

[0041] In some embodiments, a second phase change structure is provided within the heat exchange assembly.

[0042] In this embodiment, the heat exchange component can absorb the heat of the battery cell through the first phase change structure and the second phase change structure, which can further increase the heat absorption and thus improve the heat dissipation effect.

[0043] In some embodiments, the second phase change structure is a layered structure formed of a second phase change material.

[0044] In this embodiment, the second phase change structure is a layered structure formed by the second phase change material. It has a simple structure and a large heat exchange area, which is beneficial for use in combination with the first phase change structure.

[0045] In some embodiments, the heat exchange assembly has heat exchange channels for circulating heat exchange medium.

[0046] In this embodiment, the heat exchange component can exchange heat with the battery cell through the first phase change structure and the heat exchange medium. When the battery cell is at a high temperature, the temperature of the battery cell can be quickly reduced, thereby reducing the risk of overheating. The heat exchange medium can continuously flow through the heat exchange channel, and the heat exchange medium can stably remove heat, improving the continuous heat dissipation capacity.

[0047] In some embodiments, the heat exchange channel includes: Entering the segment; At least two flow split sections, with the first phase change structure disposed between the two flow split sections; The discharge section connects the inlet section and the discharge section.

[0048] In this embodiment, the heat exchange medium entering the inlet section can be divided into multiple streams that flow into multiple branch sections, and then converged into the outlet section, from which it is discharged outside the heat exchange assembly. This multiple branch sections increase the heat exchange area and improve heat exchange efficiency. A first phase change structure is provided between two branch sections to facilitate heat exchange between the heat exchange medium within the branch sections and the first phase change structure.

[0049] This application provides an electrical device including any of the battery devices described above.

[0050] The electrical equipment provided in the embodiments of this application includes the battery device in any embodiment of this application, and has the same or corresponding beneficial effects as the battery device in any embodiment of this application. Attached Figure Description

[0051] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application; Figure 3 yes Figure 2 An exploded schematic diagram of the battery device shown. Figure 4 These are schematic diagrams of the battery device provided in other embodiments of this application; Figure 5 yes Figure 4 An exploded schematic diagram of the battery device shown. Figure 6 This is a schematic diagram of the structure of a heat exchange component provided in some embodiments of this application; Figure 7 yes Figure 6 An exploded view of the heat exchange assembly shown. Figure 8 These are schematic diagrams of the heat exchange components and power distribution boxes provided in some embodiments of this application; Figure 9 yes Figure 8 An exploded view of the structure shown. Figure 10 This is a schematic diagram of the flow path of the heat exchange medium provided in some embodiments of this application; Figure 11 This is a schematic diagram of the flow path of the heat exchange medium provided in other embodiments of this application.

[0052] Explanation of reference numerals in the attached figures 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 410, Container; 420, Power Mechanism; 430, Water Cooler; 440, First Liquid Flow Path; 450, Multi-way Valve; 460, Heater; 470, Second Liquid Flow Path; 510, Heat Pump System; 520, Fan; 530, Airflow Passage; 540, Inlet Air Damper; 550, Outlet Air Pipe; 1, Battery Cell; 11, Electrode Terminals; 2, Heat Exchange Assembly; 2a, Placement Chamber ; 21. Heat exchange channel; 211. Inlet section; 212. Diversion section; 213. Outlet section; 22. First plate; 23. Second plate; 24. Third plate; 24a. Clearance opening; 25. Connector; 3. First phase change structure; 4. Second phase change structure; 5. Housing; 5a. Receiving cavity; 51. Annular frame; 52. Bottom guard plate; 6. First busbar component; 7. Power distribution box; 71. Second busbar component; 72. Housing; 8. Thermal conductive structure; 9. Thermal conductive pad; X. Gravity direction. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, embodiments of the technical solutions of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, and are therefore merely examples and should not be used to limit the scope of protection of this application.

[0054] 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.

[0055] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0056] In this document, the term "embodiment" means that a specific 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 in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that combinations can be made in any suitable manner without contradiction; for example, different combinations of specific technical features / embodiments can form different implementations. To avoid unnecessary repetition, the various possible combinations of specific technical features / embodiments in this application will not be described separately.

[0057] It should be noted that in this application, "multiple" refers to two or more items. "At least two" refers to two or more items.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] A single battery cell 1 typically includes an electrode assembly. The electrode assembly includes 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, prevents short circuits between them while allowing active ions to pass through.

[0062] 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.

[0063] 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.

[0064] 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.).

[0065] 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.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0067] 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.).

[0068] 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.

[0069] 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.

[0070] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 1. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0076] Liquid electrolytes include electrolyte salts and solvents.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0081] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0082] 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.

[0083] 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.

[0084] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0085] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0086] In some embodiments, the electrode assembly has a stacked structure.

[0087] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0088] 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.

[0089] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0090] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0091] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0092] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0093] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] 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.

[0095] 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.

[0096] 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 be provided one or more.

[0097] In some embodiments, please refer to Figure 2 and Figure 3The outer casing has at least one electrode terminal 11, which is electrically connected to the electrode tab. The electrode terminal 11 can be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collector. The electrode terminal 11 can be located on the end cap or on the casing.

[0098] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell 1.

[0099] As an example, the internal pressure or temperature of battery cell 1 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. 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 release of internal pressure or temperature. 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.

[0100] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0101] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] The battery device 100 provided in this application includes a battery cell 1 in any one embodiment of this application, the battery cell 1 being used to provide voltage and capacity.

[0106] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 1.

[0107] 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.

[0108] In some embodiments, please refer to Figure 2 The battery device 100 can be a battery pack. The battery pack includes a housing 5 and one or more individual battery cells housed within the housing 5.

[0109] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 5 by fixing the battery module in the housing 5.

[0110] As an example, the battery cell assembly can also be housed in the housing 5 by directly fixing multiple battery cells 1 to the housing 5.

[0111] As an example, the housing 5 may include a first housing body and a second housing body. The first housing body and the second housing body are fastened together, so that the interior of the housing 5 forms a closed space to accommodate the battery cell assembly.

[0112] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0113] 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.

[0114] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, vehicles, ships, or spacecraft. Vehicles can include electric bicycles and electric cars; electric toys can include electric bicycle toys and electric car toys, etc., including stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0115] Energy storage devices include, but are not limited to, energy storage containers or energy storage cabinets.

[0116] 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.

[0117] Figure 1The 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 in the lower part, 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.

[0118] 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.

[0119] In related technologies, during the charging and discharging process of a battery device, especially under high-rate charging and discharging conditions, the individual battery cells inside the battery device will generate heat, and the individual battery cells are prone to overheating risks.

[0120] In view of this, embodiments of this application provide a battery device, the battery device including a heat exchange component and at least two battery cells, the heat exchange component being disposed at at least one end of the battery cells in a first direction, the heat exchange component being disposed within a first phase change structure; the first phase change structure including a frame and a first phase change material, the first phase change material being disposed on the frame, the frame including foam metal.

[0121] The battery device provided in this application embodiment features a first phase change material capable of undergoing a phase change. The framework has a porous structure that maintains its shape during the phase change process. Since the first phase change material typically expands in volume when it melts, utilizing the pores of the framework to support it mitigates the problem of easy expansion and leakage, and also increases its heat storage density. The heat exchange component absorbs heat from the battery cells through the first phase change structure. Based on the isothermal latent heat phase change of the first phase change structure, it passively absorbs and stores heat within a relatively stable temperature range, improving temperature control. The foamed metal has a relatively high thermal conductivity and good structural support, which not only increases the heat conduction rate between the first phase change material and the battery cells, rapidly dispersing heat and reducing the risk of heat concentration and mitigating the relatively slow heat conduction of the first phase change material, but also maintains its structural shape, providing support for the first phase change material and using capillary action to lock it in, reducing the risk of leakage after complete melting.

[0122] 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. Figure 2 and Figure 3 The battery device 100 provided in this application embodiment includes a heat exchange assembly 2 and at least two battery cells 1.

[0123] Please see Figure 2 , Figure 3 as well as Figure 7 A heat exchange component 2 is provided at at least one end of the battery cell 1 in a first direction, and a first phase change structure 3 is provided inside the heat exchange component 2; the first phase change structure 3 includes a skeleton and a first phase change material, the first phase change material is disposed on the skeleton, and the skeleton includes foam metal.

[0124] For example, the first phase change structure 3 can exchange heat with the battery cell 1.

[0125] The first phase change material can undergo a phase change. For example, it can be a solid-liquid phase change or a solid-gas phase change, during which heat can be absorbed or released. For ease of description, this application uses a solid-liquid phase change as an example.

[0126] For example, when the battery cell 1 is at a high temperature, such as during the charging and discharging process of the battery cell 1, when the temperature is higher than the phase change temperature of the first phase change material, the first phase change material can undergo a phase change, such as changing from a solid phase to a liquid phase. The first phase change material can absorb heat and convert it into its own latent heat, thereby reducing the temperature of the battery cell 1 and achieving cooling and heat dissipation.

[0127] The first phase change material can release its latent heat to the environment, battery cell 1, or other media, thus allowing the first phase change material to transform back into a solid phase.

[0128] The phase transition temperature of the first phase change material can be selected according to the heat dissipation requirements, and this application does not impose any restrictions.

[0129] The skeleton is a porous structure, and by way of example, at least two pores can be connected to each other and to the outer surface of the skeleton.

[0130] The melting point of the skeleton can be higher than the phase transition temperature of the first phase change material. The skeleton maintains its shape during the phase transition of the first phase change material, so that the pores of the skeleton can accommodate the molten first phase change material.

[0131] The size of the pores can be designed according to requirements; for example, the size of the pores can be millimeters or less.

[0132] The first phase change material can be attached to the framework by means of deposition or wetting. For example, the first phase change material is in the liquid phase and can enter and exit the pores of the framework.

[0133] For example, the battery cell 1 may be provided with heat exchange components 2 at one or both ends in the first direction.

[0134] It should be noted that the first direction can be parallel to or intersect with the direction of gravity X, for example, orthogonal or oblique.

[0135] Foamed metal is a porous structure formed from metallic materials. For example, the porosity of foamed metal can be 90% or higher.

[0136] The battery device 100 provided in this application embodiment features a first phase change material capable of undergoing a phase change. The framework has a porous structure that maintains its shape during the phase change process. Since the first phase change material typically expands in volume when it melts, utilizing the pores of the framework to support it mitigates the problem of easy expansion and leakage, and also increases its heat storage density. The heat exchange component 2 absorbs heat from the battery cell 1 through the first phase change structure 3. Based on the isothermal latent heat phase change of the first phase change structure 3, it passively absorbs and stores heat within a relatively stable temperature range, improving temperature control. The foamed metal has a relatively high thermal conductivity and good structural support, which not only increases the thermal conductivity rate between the first phase change material and the battery cell 1, rapidly dispersing heat and reducing the risk of heat concentration and mitigating the relatively slow thermal conductivity of the first phase change material, but also maintains its structural shape, providing support for the first phase change material and using capillary action to lock it in, reducing the risk of leakage after complete melting.

[0137] In this application embodiment, the type of foamed metal is not limited, but for example, it includes, but is not limited to, foamed iron, foamed copper, etc.

[0138] The type of the first phase change material is not limited, and the first phase change material may include at least one of paraffin, fatty acid, hydrated salt or eutectic hydrated salt.

[0139] In some embodiments, please refer to Figure 6 and Figure 7 A second phase change structure 4 is provided inside the heat exchange component 2.

[0140] The second phase change structure 4 is a structure in which at least part of the structure can undergo a phase change. For example, it can be a solid-liquid phase change or a solid-gas phase change, during which heat can be absorbed or released. For ease of description, this application uses a solid-liquid phase change as an example.

[0141] The second phase change structure 4 can exchange heat with the battery cell 1.

[0142] For example, when the battery cell 1 is at a high temperature, such as during the charging and discharging process of the battery cell 1, when the temperature is higher than the phase change temperature of the second phase change structure 4, the second phase change structure 4 can undergo a phase change, such as changing from a solid phase to a liquid phase. The second phase change structure 4 can absorb heat and convert it into its own latent heat, thereby reducing the temperature of the battery cell 1 and achieving cooling and heat dissipation.

[0143] The second phase change structure 4 can release its latent heat to the environment, the battery cell 1, or other media, so that the second phase change structure 4 can be transformed into a solid phase again.

[0144] The phase transition temperature of the second phase transition structure 4 can be selected according to the heat dissipation requirements, and this application does not impose any restrictions.

[0145] In this embodiment, the heat exchange component 2 can absorb the heat of the battery cell 1 through the first phase change structure 3 and the second phase change structure 4, which can further increase the heat absorption and thus improve the heat dissipation effect.

[0146] In some embodiments, please refer to Figure 6 and Figure 7 The second phase change structure 4 and the first phase change structure 3 are at least partially stacked.

[0147] In this embodiment, the second phase change structure 4 and the first phase change structure 3 can be partially or fully stacked to improve structural compactness.

[0148] In some embodiments, please refer to Figure 6 and Figure 7 The heat exchange component 2 forms a placement cavity 2a, and the first phase change structure 3 and the second phase change structure 4 are both disposed in the placement cavity 2a.

[0149] For example, the first phase change structure 3 and the second phase change structure 4 are both disposed in the placement cavity 2a and are stacked.

[0150] The number of placement cavities 2a is unlimited; there can be one or more placement cavities 2a. Each placement cavity 2a can be isolated from the others, and the first phase change structure 3 and the second phase change structure 4 can be placed there respectively.

[0151] In this embodiment, both the first phase change structure 3 and the second phase change structure 4 are disposed in the placement cavity 2a, which not only simplifies the assembly process, but also facilitates the heat transfer between the first phase change structure 3 and the second phase change structure 4.

[0152] In some embodiments, the placement cavity 2a is a closed chamber. This way, after the first phase change structure 3 and the second phase change structure 4 melt, they will not flow out of the placement cavity 2a.

[0153] In some embodiments, the battery device 100 includes a separator disposed within the placement cavity 2a, the separator being positioned between the first phase change structure 3 and the second phase change structure 4. Separating the first phase change structure 3 and the second phase change structure 4 by the separator can reduce the mixing between them.

[0154] The separator can be made of a thermally conductive material; for example, the separator can be made of metal.

[0155] In some embodiments, the first phase change structure 3 and the second phase change structure 4 may also be placed separately in different chambers of the heat exchange assembly 2.

[0156] In some embodiments, please refer to Figure 7 The second phase change structure 4 is a layered structure formed by the second phase change material.

[0157] A layered structure is a structure whose dimension in the thickness direction is smaller than the dimension of the surface perpendicular to the thickness direction.

[0158] In this embodiment, the second phase change structure 4 is a layered structure formed by the second phase change material. It has a simple structure and a large heat exchange area, which is beneficial for its use in combination with the first phase change structure 3.

[0159] The type of the second phase change material is not limited. For example, the second phase change material may include at least one of paraffin, fatty acid, hydrated salt or eutectic hydrated salt.

[0160] It should be noted that the second phase change material may be the same as or different from the first phase change material.

[0161] In some embodiments, both the first and second phase change materials can be paraffin wax. In some embodiments, the first phase change material can be paraffin wax, and the second phase change material can be fatty acid.

[0162] The thickness dimension of the second phase change structure 4 can be set according to requirements. In some embodiments, the thickness dimension of the second phase change structure 4 can be 5mm. Of course, the second phase change structure 4 can be thicker or thinner as needed.

[0163] In some embodiments, the second phase change structure 4 is located on the side of the first phase change structure 3 closer to the battery cell 1. This reduces the thermal resistance of the heat dissipation path of the battery cell 1, directly transferring heat to the second phase change material and utilizing the latent heat properties after the phase change for heat absorption.

[0164] In some embodiments, the skeleton may also be a layered structure.

[0165] The dimensions of the skeleton in the thickness direction can be set according to requirements. In some embodiments, the dimensions of the skeleton in the thickness direction can be 3mm. Of course, the skeleton can be thicker or thinner as needed.

[0166] In some embodiments, please refer to Figure 6 and Figure 7 The heat exchange component 2 has a heat exchange channel 21, which is used to circulate the heat exchange medium.

[0167] The heat exchange medium can exchange heat with the battery cell 1.

[0168] For example, when the battery cell 1 is at a high temperature, such as during the charging and discharging process of the battery cell 1, the heat exchange medium absorbs heat, thereby reducing the temperature of the battery cell 1 and achieving cooling and heat dissipation.

[0169] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve the heat exchange effect on the battery cell 1. For example, it can be gaseous or liquid. For example, the heat exchange medium can be air, water, or antifreeze, etc.

[0170] The specific number of heat exchange channels 21 is not limited here; there can be one or more.

[0171] It is understandable that the process of the first phase change structure 3 absorbing or releasing heat through phase change is latent heat transfer, and the temperature of the first phase change structure 3 remains basically unchanged; while the heat exchange medium relies on continuous flow to carry away heat, which is sensible heat transfer, and the temperature of the heat exchange medium generally changes.

[0172] For example, after the battery cell 1 is cooled down, the first phase change structure 3 can also conduct heat to the heat exchange medium through the solid structure of the heat exchange component 2. The heat exchange medium can carry away the heat of the first phase change structure 3, so that the first phase change structure 3 changes from liquid phase to solid phase.

[0173] In this embodiment, the heat exchange component 2 can exchange heat with the battery cell 1 through the first phase change structure 3 and the heat exchange medium. When the battery cell 1 is at a high temperature, the temperature of the battery cell 1 can be quickly reduced, thereby reducing the risk of overheating. The heat exchange medium can continuously flow through the heat exchange channel 21, and the heat exchange medium can stably remove heat, improving the continuous heat dissipation capacity.

[0174] In some embodiments, please refer to Figure 6 and Figure 7 The heat exchange component 2 forms a placement cavity 2a, which is isolated from the heat exchange channel 21, and the first phase change structure 3 is disposed in the placement cavity 2a.

[0175] In this embodiment, the placement cavity 2a is isolated from the heat exchange channel 21. That is, the first phase change structure 3 in the placement cavity 2a will not enter the heat exchange channel 21, and the heat exchange medium in the heat exchange channel 21 will not enter the placement cavity 2a. In this way, the mixing of the first phase change structure 3 and the heat exchange medium can be avoided.

[0176] In some embodiments, please refer to Figure 7 At least a portion of the heat exchange channel 21 surrounds the first phase change structure 3.

[0177] In this embodiment, part or all of the structure of the heat exchange channel 21 may surround the first phase change structure 3, which not only makes the heat exchange component 2 compact, but also facilitates heat transfer between the heat exchange medium and the first phase change structure 3.

[0178] In some embodiments, please refer to Figure 7 The heat exchange channel 21 includes an inlet section 211, at least two branch sections 212, and an outlet section 213. A first phase change structure 3 is provided between the two branch sections 212. Each branch section 212 is connected to the inlet section 211 and the outlet section 213.

[0179] In this embodiment, the heat exchange medium entering section 211 can be divided into multiple streams that enter multiple branch sections 212, and then converge into the discharge section 213, through which it is discharged outside the heat exchange assembly 2. In this way, multiple branch sections 212 can increase the heat exchange area and improve the heat exchange efficiency. A first phase change structure 3 is provided between two branch sections 212 to facilitate heat exchange between the heat exchange medium in the branch section 212 and the first phase change structure 3.

[0180] In some embodiments, please refer to Figure 3 , Figure 6and Figure 7 The heat exchange assembly 2 includes a first plate 22 and a second plate 23. The battery cell 1 is connected to the first plate 22. The second plate 23 is stacked with the first plate 22. The first plate 22 and the second plate 23 together define the placement cavity 2a. The first phase change structure 3 is disposed in the placement cavity 2a.

[0181] Both the first plate 22 and the second plate 23 are plate-shaped structures and are stacked, so that the heat exchange component 2 can be roughly flat.

[0182] In this embodiment, the placement cavity 2a is defined by the first plate 22 and the second plate 23, which can better prevent the leakage of the first phase change material after melting; the battery cell 1 is connected to the first plate 22, and the heat of the battery cell 1 can be transferred to the first plate 22 and then to the first phase change structure 3. The heat exchange component 2 has a simple structure and is easy to manufacture and assemble.

[0183] In some embodiments, please refer to Figure 6 and Figure 7 The second plate 23 forms a first groove that opens toward the first plate 22, and the first plate 22 closes the opening of the first groove to jointly define the placement cavity 2a.

[0184] In this embodiment, the first phase change structure 3 can be placed into the first groove through the opening of the first groove, and the volume of the placement cavity 2a can be relatively large to facilitate the placement of the first phase change structure 3.

[0185] The formation of the first groove is not limited. In some embodiments, a portion of the second plate 23 may be thinned to form the first groove. With this design, the surface of the second plate 23 facing away from the first plate 22 can be flat. In some embodiments, a portion of the second plate 23 may protrude in a direction away from the first plate 22 to form the first groove. With this design, the surface of the second plate 23 facing away from the first plate 22 can be a convex-concave surface.

[0186] In some embodiments, the first plate 22 can be a flat plate structure. That is, both surfaces of the first plate 22 perpendicular to its thickness direction are planar. This facilitates the connection between the first plate 22 and the battery cell 1, thereby enabling large-area contact heat exchange.

[0187] The connection method between the first plate 22 and the battery cell 1 is not limited. For example, the first plate 22 can be bonded to the battery cell 1 through a thermally conductive structure 8. The thermal conductivity of the thermally conductive structure 8 can be relatively high in order to establish an efficient heat conduction path between the first plate 22 and the battery cell 1.

[0188] The type of thermally conductive structure 8 is not limited. For example, the thermally conductive structure 8 includes, but is not limited to, structural adhesive or thermally conductive adhesive.

[0189] The connection method between the first plate 22 and the second plate 23 is not limited. For example, the first plate 22 and the second plate 23 can be detachably connected or non-detachably connected. For example, the first plate 22 and the second plate 23 can be welded.

[0190] Unless otherwise stated, in the embodiments of this application, detachable connections include, but are not limited to, at least one of screw connections, bolt connections, and snap-fit ​​connections. Non-detachable connections include, but are not limited to, at least one of welding, riveting, and bonding.

[0191] The material of the first plate 22 can be set according to requirements. For example, the first plate 22 can be made of a material with high thermal conductivity, such as metal.

[0192] The material of the second plate 23 can be set according to requirements. For example, the second plate 23 can be made of a material with high thermal conductivity, such as metal.

[0193] The thickness of the first plate 22 can be set according to requirements. In some embodiments, the thickness of the first plate 22 can be 0.3mm-0.5mm. For example, the thickness of the first plate 22 can be 0.3mm, 0.4mm, or 0.5mm. This facilitates the rapid conduction of heat by the first plate 22.

[0194] In some embodiments, the second phase change structure 4 is located at the end of the first phase change structure 3 near the first plate 22. This reduces the thermal resistance of the heat dissipation path, facilitating the rapid transfer of heat from the battery cell 1, the first busbar 6, or the second busbar 71 to the second phase change material and the first phase change material.

[0195] In some embodiments, please refer to Figure 6 and Figure 7 The heat exchange assembly 2 includes a third plate 24, a second plate 23 forming a second groove opening toward the third plate 24, and the third plate 24 closing the opening of the second groove to jointly define a heat exchange channel 21 for the flow of heat exchange medium.

[0196] In this embodiment, a heat exchange channel 21 is formed by opening a second groove on the second plate 23 and closing the opening of the second groove by the third plate 24, which can reduce the manufacturing difficulty of the heat exchange channel 21.

[0197] The formation of the second groove is not limited. In some embodiments, a portion of the second plate 23 may be thinned to form the second groove. With this design, the surface of the second plate 23 facing away from the third plate 24 can be flat. In some embodiments, a portion of the second plate 23 may protrude in a direction away from the third plate 24 to form the second groove. With this design, the surface of the second plate 23 facing away from the third plate 24 can be a convex-concave surface.

[0198] In some embodiments, the third plate 24 can be a flat plate structure. That is, both surfaces of the third plate 24 perpendicular to its thickness direction are planar. This facilitates the connection of the third plate 24 with the battery cell 1, thereby enabling large-area contact heat exchange.

[0199] The connection method between the third plate 24 and the battery cell 1 is not limited. For example, the third plate 24 can be bonded to the battery cell 1 through the thermally conductive structure 8. The thermal conductivity of the thermally conductive structure 8 can be relatively high in order to establish an efficient heat conduction path between the third plate 24 and the battery cell 1.

[0200] The connection method between the third plate 24 and the second plate 23 is not limited. For example, the third plate 24 and the second plate 23 can be connected in a detachable or non-detachable manner.

[0201] The material of the third plate 24 can be set according to requirements. For example, the third plate 24 can be made of a material with high thermal conductivity, such as metal.

[0202] The thickness of the third plate 24 can be set according to requirements. In some embodiments, the thickness of the third plate 24 can be 0.3mm-0.5mm. For example, the thickness of the third plate 24 can be 0.3mm, 0.4mm, or 0.5mm. This facilitates the rapid conduction of heat by the third plate 24.

[0203] In some embodiments, please refer to Figure 6 and Figure 7 The third plate 24 has a clearance opening 24a, and the first plate 22 is located within the clearance opening 24a.

[0204] For example, the surface of the third plate 24 away from the second plate 23 and the surface of the first plate 22 away from the second plate 23 can be flush. In other words, the surface of the third plate 24 away from the second plate 23 and the surface of the first plate 22 away from the second plate 23 can be substantially in the same plane. This facilitates that the surfaces of the third plate 24 away from the second plate 23 and the surface of the first plate 22 away from the second plate 23 both contact the battery cell 1.

[0205] In some embodiments, please refer to Figure 2 and Figure 3 A heat exchange component 2 is provided at the lower end of the battery cell 1 in the direction of gravity X.

[0206] It should be noted that the direction of gravity X specifically refers to the direction of Earth's gravity, in other words, the direction perpendicular to the Earth's center.

[0207] For example, with the horizontal plane as the projection plane, the projection of the battery cell 1 is located within the projection range of the heat exchange component 2.

[0208] In this embodiment, a heat exchange component 2 is provided at the lower end of the battery cell 1 in the direction of gravity X, and the heat exchange component 2 can provide an upward supporting force for the battery cell 1.

[0209] In some embodiments, at least one large surface of the battery cell 1 may be provided with a heat exchange component 2. The large surface of the battery cell 1 refers to the surface with the largest area of ​​the battery cell 1. The large surface of the battery cell 1 is connected to the heat exchange component 2, and the heat exchange area of ​​the two is relatively large, so as to improve the heat exchange efficiency.

[0210] In some embodiments, at least two battery cells 1 are arranged in a third direction to form a cell group, and at least two cell groups are arranged along a second direction. A heat exchange component 2 is provided at the lower end of each cell group in the gravity direction X. The second direction, the third direction, and the gravity direction X can be perpendicular to each other. This balances the temperature difference between the battery cells 1 located at the edges and those located in the middle, improving temperature uniformity.

[0211] In some embodiments, please refer to Figure 2 and Figure 3 The battery device 100 includes a housing 5, which has a receiving cavity 5a, in which at least two battery cells 1 and a heat exchange assembly 2 are disposed.

[0212] The receiving cavity 5a is used to hold the battery cell 1, the heat exchange assembly 2 and other structural components, and to protect the battery cell 1, the heat exchange assembly 2 and other structural components, so as to prevent foreign objects outside the housing 5 from affecting the charging or discharging of the battery cell 1.

[0213] In this embodiment, the housing 5 provides protection for the battery cell 1 and the heat exchange assembly 2, preventing foreign objects outside the housing 5 from affecting the charging or discharging of the battery cell 1.

[0214] The shape of the box 5 is not limited. For example, the box 5 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.

[0215] In some embodiments, the box 5 can be hexahedral, such as cuboid or cube. Taking a cuboid shape as an example, the length and width directions of the box 5 are approximately parallel to the horizontal plane, and the length direction of the box 5 is parallel to the longest side of the cuboid.

[0216] In some embodiments, please refer to Figure 2 and Figure 3 The housing 5 includes a bottom protective plate 52, an annular frame 51, and a top cover. The annular frame 51 has a top side opening and a bottom side opening. The bottom protective plate 52 is connected to the annular frame 51 and closes the bottom side opening. The top cover is connected to the annular frame 51 and closes the top side opening. The top cover, the annular frame 51, and the bottom protective plate 52 together define the receiving cavity 5a.

[0217] In some embodiments, the heat exchange assembly 2 may be connected to the bottom cover plate 52. The heat from the heat exchange assembly 2 can be transferred to the external environment through the bottom cover plate 52.

[0218] The bottom opening is the opening at the lower end of the annular frame 51 facing the direction of gravity X.

[0219] The top opening is the opening at the upper end of the annular frame 51 facing the direction of gravity X.

[0220] The material of the ring frame 51 is not limited. For example, the material of the ring frame 51 can be metal materials such as cold-rolled steel plate or hot-dip galvanized steel plate, or polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0221] The material of the top cover is not limited. For example, the material of the top cover can be metal materials such as cold-rolled steel plate or hot-dip galvanized steel plate, or polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0222] The material of the bottom guard plate 52 is not limited. For example, the material of the bottom guard plate 52 can be metal materials such as cold-rolled steel plate or hot-dip galvanized steel plate, or polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0223] In some embodiments, please refer to Figure 4 and Figure 5 The battery device 100 includes a first busbar component 6, which is connected to the electrode terminals 11 of the battery cell 1, and the first busbar component 6 is provided with a heat exchange assembly 2.

[0224] The first busbar component 6 is an electrical connector that has a conductive function and can conduct current, etc.

[0225] For example, at least one of the first phase change structure 3, the second phase change structure 4, and the heat exchange medium can absorb the heat of the first busbar 6, thereby reducing the temperature of the first busbar.

[0226] In this embodiment, the first busbar 6 generates heat during the conduction of current, etc. The first busbar 6 is provided with a heat exchange component 2, which can provide heat dissipation and cooling function for the first busbar 6.

[0227] The type of the first busbar component 6 is not limited. For example, the first busbar component 6 can be made of conductive metal, such as copper.

[0228] In some embodiments, multiple battery cells 1 can be connected in series, parallel, or in a mixed configuration via the first busbar 6.

[0229] For example, "hybrid connection" refers to at least two battery cells 1 being connected in both series and parallel. Multiple battery cells 1 can be directly connected in series, parallel, or hybrid connections; of course, at least two battery cells 1 can first be 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.

[0230] Taking the example of a first busbar 6 electrically connecting two battery cells 1, in some embodiments, the first busbar 6 can electrically connect the positive electrode terminal 11 of one battery cell 1 and the negative electrode terminal 11 of the other battery cell 1, thus connecting the two battery cells 1 in series. In other embodiments, the first busbar 6 can electrically connect the positive electrode terminal 11 of one battery cell 1 and the positive electrode terminal 11 of the other battery cell 1, thus connecting the two battery cells 1 in parallel. In still other embodiments, the first busbar 6 can electrically connect the negative electrode terminal 11 of one battery cell 1 and the negative electrode terminal 11 of the other battery cell 1, thus connecting the two battery cells 1 in parallel.

[0231] In some embodiments, the electrode terminal 11 is disposed at the upper end of the housing in the gravitational direction X, the first busbar 6 is connected to the electrode terminal 11, and the first plate 22 can be connected to the upper end of the first busbar 6. In this way, the heat exchange assembly 2 is placed upside down above the first busbar 6.

[0232] In this embodiment, the thickness of the first plate 22 can be less than the thickness of the second plate 23. The relatively thin first plate 22 is connected to the first busbar component 6, which facilitates the rapid transfer of heat generated by the first busbar component 6 by the first plate 22.

[0233] The connection method between the first busbar component 6 and the heat exchange component 2, such as the first plate 22, is not limited. For example, the first busbar component 6 can abut against the heat exchange component 2, or be bonded through the heat-conducting structure 8, etc.

[0234] The first busbar component 6 and the heat exchange assembly 2 can be insulated. For example, the first plate 22 and the second plate 23 can be made of thermally conductive and insulating material. In some embodiments, the surfaces of the first plate 22 and the second plate 23 can be provided with an insulating coating. Of course, other methods can also be used to achieve a thermally conductive and insulating connection between the first busbar component 6 and the heat exchange assembly 2, which will not be elaborated here.

[0235] In some embodiments, please refer to Figure 8 and Figure 9 The battery device 100 includes a power distribution box 7, which includes a second busbar component 71, and the second busbar component 71 is provided with a heat exchange assembly 2.

[0236] The power distribution box 7 can perform high-voltage distribution of the electrical energy output by the battery device 100.

[0237] For example, the power distribution box 7 can also be used to detect the voltage and current of the battery device 100.

[0238] The second busbar component 71 is an electrical connector that has a conductive function and is capable of conducting current.

[0239] For example, at least one of the first phase change structure 3, the second phase change structure 4, and the heat exchange medium can absorb the heat of the second busbar 71, thereby reducing the temperature of the first busbar.

[0240] In this embodiment, the second busbar 71 generates heat during the conduction of current, etc. The second busbar 71 is provided with a heat exchange component 2, which can provide heat dissipation and cooling function for the second busbar 71.

[0241] The type of the second bus component 71 is not limited. For example, the second bus component 71 can be made of conductive metal material, such as copper.

[0242] In some embodiments, please refer to Figure 8 and Figure 9 The power distribution box 7 includes a box body 72, which has a first opening. A second busbar component 71 is located inside the box body 72, and a heat exchange component 2 is located outside the box body 72. The heat exchange component 2 is connected to the second busbar component 71 through the first opening.

[0243] In this embodiment, the heat exchange component 2 is located outside the housing 72 and does not occupy the space inside the housing 72; the heat exchange component 2 is connected to the second busbar component 71 through the first opening and the housing 72 does not interfere with the heat conduction between the heat exchange component 2 and the second busbar component 71.

[0244] The connection method between the second busbar 71 and the heat exchange assembly 2, such as the first plate 22, is not limited. For example, the second busbar 71 can abut against the heat exchange assembly 2, or be bonded through the heat-conducting structure 8, etc.

[0245] In some embodiments, the battery device 100 includes a thermally conductive pad 9, which connects the second busbar 71 and the heat exchange assembly 2. The thermal conductivity of the thermally conductive pad 9 can be greater than that of structural adhesive, etc., thereby improving heat exchange efficiency by connecting the second busbar 71 and the heat exchange assembly 2 through the thermally conductive pad 9 with a high thermal conductivity.

[0246] The location of the first opening is not limited. For example, the first opening can be located at the lower end of the box 72 in the gravity direction X. Of course, the first opening can also be located at the upper end of the box 72 in the gravity direction X, or at one end of the box 72 in a third direction.

[0247] In other embodiments, a heat exchange component 2 may be provided inside the housing 72, and the heat exchange component 2 may be connected to the second busbar component 71.

[0248] In some embodiments, the distribution box 7 may be located inside or outside the enclosure 5. The connection method between the box 72 and the enclosure 5 is not limited; for example, the box 72 may be detachably or non-detachably connected to the enclosure 5.

[0249] In some embodiments, the distribution box 7 may include a relay disposed within the box body 72, and the second bus component 71 may be connected to the relay.

[0250] During the charging and discharging process of the battery device 100, the connection and disconnection between the battery device 100 and the electrical equipment can be realized by controlling the closing and opening of the relay, thereby realizing overcurrent, overvoltage and undervoltage protection.

[0251] It is understandable that, depending on the heat dissipation requirements, at least one of the battery cell 1, the first busbar 6, and the second busbar 71 may be equipped with a heat exchange component 2.

[0252] The second busbar component 71 and the heat exchange assembly 2 can be insulated. For example, the first plate 22 and the second plate 23 can be made of thermally conductive and insulating material. In some embodiments, the surfaces of the first plate 22 and the second plate 23 can be provided with an insulating coating. Of course, other methods can also be used to achieve a thermally conductive and insulating connection between the second busbar component 71 and the heat exchange assembly 2, which will not be elaborated here.

[0253] In some embodiments, the heat exchange component 2 further includes an inlet and an outlet, both of which are connected to the heat exchange channel 21.

[0254] In some embodiments, please refer to Figures 6 to 9 The heat exchange assembly 2 includes at least two connectors 25, which are connected to the third plate 24 and communicate with the heat exchange channel 21. One connector 25 has an inlet, and the other has an outlet.

[0255] For example, the inlet can be connected to the inlet section 211 and the outlet can be connected to the outlet section 213.

[0256] The material of connector 25 includes, but is not limited to, metal or plastic. Connector 25 is, for example, a water tap.

[0257] The principle of heat exchange component 2 to exchange heat with battery cell 1 is as follows: heat exchange medium enters heat exchange channel 21 through inlet, heat exchange medium exchanges heat with battery cell 1, and then heat exchange medium flows out through outlet, thus completing the heat exchange of battery cell 1.

[0258] 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.

[0259] The principle of heat exchange component 2 for heat dissipation of battery cell 1 is as follows: heat exchange medium enters heat exchange channel 21 through the inlet. After absorbing the heat generated by battery cell 1 during operation, the heat exchange medium flows out through the outlet of heat exchange component 2, releasing heat and completing the cooling of battery cell 1.

[0260] The principle of the heat exchange component 2 heating the battery cell 1 is as follows: the heat exchange medium enters the heat exchange channel 21 through the inlet, and the heat exchange medium transfers heat to the battery cell 1 to heat the battery cell 1. After the heat exchange medium flows out through the outlet, the heating of the battery cell 1 is completed.

[0261] For liquid heat transfer media, please refer to some embodiments. Figure 10 The electrical equipment includes a container 410, a power mechanism 420, a water cooler 430, and a first liquid flow path 440. The first liquid flow path 440 connects the water cooler 430 and the heat exchange channel 21 in the battery device 100. The power mechanism 420 and the container 410 are both located in the first liquid flow path 440, and the container 410 is located between the power mechanism 420 and the battery device 100.

[0262] The first liquid flow path 440 is used for the flow of liquid heat exchange medium.

[0263] Water cooler 430 is used to cool and reduce the temperature of the heat exchange medium flowing through it.

[0264] The power unit 420 is used to drive the flow of the heat exchange medium. Exemplarily, the power unit 420 includes, but is not limited to, a liquid pump.

[0265] It is understandable that the heat exchange channels 21 of multiple heat exchange components 2 can be connected to the first liquid passage, and the first liquid passage 440 provides a circulating heat exchange medium for each heat exchange component 2.

[0266] For example, the heat exchange medium, after being cooled by the water cooler 430, enters the heat exchange channel 21 within the battery device 100 through the first liquid flow path 440. After absorbing the heat from the battery cell 1, it then enters the container 410 through the first liquid flow path 440. After being buffered by the container 410, it flows back to the water cooler 430 under the action of the power mechanism 420, where it is cooled again. In this way, continuous heat dissipation and cooling of the battery cell 1 is achieved through the circulation of the heat exchange medium.

[0267] The container 410, power mechanism 420 and water cooler 430 can all be installed outside the housing 5.

[0268] In some embodiments, the first liquid flow path 440 includes an inlet pipe and an outlet pipe. The inlet pipe is used to communicate with the inlet of the heat exchange component 2, and the outlet pipe is used to communicate with the outlet of the heat exchange component 2. Part of the inlet pipe is located inside the housing 5 and the other part is located outside the housing 5, so that the heat exchange medium outside the housing 5 is transported to the housing 5. Part of the outlet pipe is located inside the housing 5 and the other part is located outside the housing 5, so that the heat exchange medium inside the housing 5 is transported to the outside of the housing 5.

[0269] In some embodiments, please refer to Figure 10 The electrical equipment may also include a multi-way valve 450, a heater 460, and a second liquid flow path 470. The first liquid flow path 440 includes a first node located between the water cooler 430 and the battery device 100. The multi-way valve 450 is disposed in the first liquid flow path 440 and located between the power mechanism 420 and the water cooler 430. The second liquid flow path 470 connects one valve port of the multi-way valve 450 and the first node. The heater 460 is disposed in the second liquid flow path 470.

[0270] Heater 460 is used to provide heat; for example, heater 460 can convert electrical energy into heat energy.

[0271] For example, the multi-way valve 450 can control the opening and closing of the first liquid flow path 440 and the second liquid flow path 470, thereby changing the flow direction of the heat exchange medium.

[0272] When the battery cell 1 needs to be heated, the multi-way valve 450 can cut off the valve port connected to the water cooler 430 and open the valve port connected to the second liquid flow path 470. The heat exchange medium enters the second liquid flow path 470 and flows through the heater 460. The heated heat exchange medium enters the battery device 100 through the first node to exchange heat with the battery cell 1 and achieve the heating and temperature rise of the battery cell 1.

[0273] When the battery cell 1 needs to be cooled, the multi-way valve 450 can cut off the valve port connected to the second liquid flow path 470 and open the valve port connected to the water cooler 430. The heat exchange medium flows through the first liquid flow path 440 and through the water cooler 430. The cooled heat exchange medium enters the battery device 100 through the first node to exchange heat with the battery cell 1, thereby achieving heat dissipation and cooling of the battery cell 1.

[0274] The cooling method of the water cooler 430 is not limited. For example, the heat exchange medium in the water cooler 430 can exchange heat with the refrigerant in the refrigerant pipeline, and the heat exchange medium releases heat to the refrigerant to achieve cooling.

[0275] Container 410 can be an expansion tank, which is used to store the heat exchange medium, compensate for the thermal expansion and contraction of the heat exchange medium, and can also be used to discharge loop air.

[0276] For gaseous heat transfer media, please refer to some embodiments. Figure 11 The electrical equipment includes a heat pump system 510, a fan 520, and an airflow passage 530. The airflow passage 530 connects the first air duct of the heat pump system 510 and the heat exchange passage 21 in the battery device 100. The fan 520 is located in the airflow passage 530. The heat exchange medium can be air, which can reduce the risk of leakage.

[0277] The heat pump system 510 can provide either hot or cold airflow. Hot airflow in the first air duct enters the heat exchange channel 21 to heat the battery cell 1. Cold airflow in the first air duct enters the heat exchange channel 21 to cool the battery cell 1.

[0278] It is understandable that the temperature of the hot airflow is higher than that of the cold airflow, and the temperatures of the hot and cold airflows can be adjusted according to the needs of the battery cell 1.

[0279] In some embodiments, please refer to Figure 11 The electrical equipment includes an air inlet damper 540, which can be installed in the airflow passage 530 to control the opening and closing of the airflow passage 530. When air intake is required in the heat exchange passage 21, the air inlet damper 540 can be opened; when air intake is not required in the heat exchange passage 21, the air inlet damper 540 can be closed to achieve active heat exchange.

[0280] For example, the air intake damper 540 may be located between the fan 520 and the battery device 100.

[0281] In some embodiments, the battery device 100 includes an air intake structure and an air collection structure, both located within the housing 5. The air intake structure connects the airflow passage 530 to the inlet of each heat exchange component 2, and the air collection structure connects to the outlet of each heat exchange component 2. The airflow in the airflow passage 530 can enter the battery device 100 through the air intake structure and then be distributed to each heat exchange channel 21. The airflow after heat exchange in each heat exchange channel 21 can converge to the air collection structure and then be discharged outside the housing 5 through the air collection structure.

[0282] For example, the air collection structure can be connected to the atmosphere through the air outlet duct 550. In this way, the heat exchange medium after heat exchange can be directly discharged into the environment.

[0283] In some embodiments, the heat pump system 510 includes a first air duct, a second air duct, refrigerant piping, a second heat exchanger, a first heat exchanger, a throttling device, a compressor, and a four-way valve. The second heat exchanger, the first heat exchanger, the throttling device, the compressor, and the four-way valve are all located on the refrigerant piping. The first heat exchanger may be located within the first air duct, and the second heat exchanger may be located within the second air duct. The second air duct may be connected to the outside atmosphere.

[0284] The first heat exchanger and the second heat exchanger each have a condenser and an evaporator, respectively.

[0285] When the first heat exchanger is a condenser, the heat exchange medium in the first air duct is heated, thereby heating the battery cell 1.

[0286] When the first heat exchanger is an evaporator, the heat exchange medium in the first air duct is cooled down, thereby providing heat dissipation for the battery cell 1.

[0287] The compressor is used to drive the flow of refrigerant and to pressurize the refrigerant.

[0288] The high-pressure, high-temperature gaseous refrigerant inside the condenser releases heat to the surrounding gas, and the refrigerant is converted into a medium-temperature, high-pressure liquid refrigerant.

[0289] The throttling device is used to reduce pressure and convert medium-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure gas-liquid mixture refrigerant.

[0290] The low-temperature, low-pressure refrigerant inside the evaporator absorbs heat from the surrounding gas, transforming into a high-temperature gaseous refrigerant.

[0291] The four-way valve is used to switch the refrigerant flow direction, allowing the refrigerant from the compressor to flow into one of the first and second heat exchangers.

[0292] In this embodiment, the heat pump system 510 realizes heat exchange between the heat exchange medium and the ambient air, thereby regulating the temperature of the heat exchange medium and providing hot or cold airflow to the heat exchange channel 21.

[0293] 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 9The battery device 100 includes a housing 5, a first busbar 6, a power distribution box 7, a heat exchange assembly 2, and at least two battery cells 1. The at least two battery cells 1, the first busbar 6, the power distribution box 7, the second busbar 71, and the heat exchange assembly 2 are all disposed within a receiving cavity 5a. The heat exchange assembly 2 is disposed at the lower end of each battery cell 1 in the gravitational direction X, at the upper end of the first busbar 6, and at the second busbar 71. The heat exchange assembly 2 includes a first plate 22, a second plate 23, and a third plate 24. The second plate 23 forms a first groove opening toward the first plate 22, and the first plate 22 closes the opening of the first groove to collectively define a placement cavity 2a. The second plate 23 forms a second groove opening toward the third plate 24, and the third plate 24 closes the opening of the second groove to collectively define a heat exchange channel 21 for the flow of a heat exchange medium. The first phase change structure 3 and the second phase change structure 4 are both disposed within the placement cavity 2a, with the second phase change structure 4 stacked on top of the first phase change structure 3 near the first plate 22. The first phase change structure 3 includes a skeleton and a first phase change material, with the first phase change material disposed on the skeleton, which can be foamed metal. The second phase change structure 4 is a layered structure formed of the second phase change material. The heat exchange assembly 2 has a heat exchange channel 21 for flowing heat exchange medium, and at least a portion of the heat exchange channel 21 surrounds the first phase change structure 3.

[0294] In this embodiment, within the corresponding phase change temperature, the first and second phase change materials absorb heat after melting, achieving the purpose of first-stage heat dissipation. When the operating conditions are harsh, for example, when the temperature of the battery cell 1 exceeds the phase change temperature of the first and second phase change materials, or when the enthalpy value decreases after the phase change materials melt, the heat exchange medium can continuously flow within the heat exchange channel 21 for active cooling, achieving the purpose of second-stage heat dissipation. A heat exchange component 2 is provided at the lower end of the battery cell 1. The heat dissipation path of the battery cell 1 can be transferred to the bottom protective plate 52 of the housing 5 through the heat conduction structure 8, the first plate 22, the second phase change structure 4, the first phase change structure 3, and the second plate 23, and then transferred to the external environment through the housing 5. Of course, the heat exchange medium can continuously flow within the heat exchange channel 21 to transfer heat to the outside of the housing 5. A heat exchange component 2 can be installed at the upper end of the first busbar component 6. The heat dissipation path of the first busbar component 6 can be transferred to the top cover of the housing 5 through the heat conduction structure 8, the first plate 22, the second phase change structure 4, the first phase change structure 3, and the second plate 23, and then transferred to the external environment through the housing 5. Of course, the heat exchange medium can continuously flow in the heat exchange channel 21 to transfer heat to the outside of the housing 5. The power distribution box 7 is installed inside the housing 5. A heat exchange component 2 can be installed at the lower end of the second busbar component 71. The heat dissipation path of the second busbar component 71 can be transferred to the bottom protective plate 52 of the housing 5 through the heat conduction pad 9, the first plate 22, the second phase change structure 4, the first phase change structure 3, and the second plate 23, and then transferred to the external environment through the housing 5. Of course, the heat exchange medium can continuously flow in the heat exchange channel 21 to transfer heat to the outside of the housing 5. The first phase change material can undergo a phase change, and its framework is a porous structure. The framework maintains its shape during the phase change process. Since the first phase change material typically expands in volume when it melts, utilizing the pores of the framework to support it can resolve the issue of "easy expansion and leakage" and increase its heat storage density. The heat exchange component 2 absorbs heat from the battery cell 1 through the first phase change structure 3. Based on the isothermal latent heat phase change of the first phase change structure 3, it passively absorbs and stores heat within a relatively stable temperature range, thus improving temperature control.

[0295] 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, The battery device includes: At least two battery cells; A heat exchange assembly is provided at at least one end of the battery cell in a first direction, and a first phase change structure is provided inside the heat exchange assembly; The first phase change structure includes a skeleton and a first phase change material, the first phase change material being disposed on the skeleton, and the skeleton including foam metal.

2. The battery device according to claim 1, characterized in that, The heat exchange component is equipped with a second phase change structure.

3. The battery device according to claim 2, characterized in that, The second phase change structure and the first phase change structure are at least partially stacked.

4. The battery device according to claim 2, characterized in that, The heat exchange assembly forms a placement cavity, and both the first phase change structure and the second phase change structure are disposed within the placement cavity.

5. The battery device according to claim 2, characterized in that, The second phase change structure is a layered structure formed by the second phase change material.

6. The battery device according to claim 1, characterized in that, The heat exchange component has heat exchange channels for circulating heat exchange medium.

7. The battery device according to claim 6, characterized in that, The heat exchange assembly forms a placement cavity, which is isolated from the heat exchange flow channel, and the first phase change structure is disposed within the placement cavity.

8. The battery device according to claim 6, characterized in that, At least a portion of the heat exchange channel surrounds the first phase change structure.

9. The battery device according to claim 6, characterized in that, The heat exchange channel includes: Entering the segment; At least two flow split sections, with the first phase change structure disposed between the two flow split sections; The discharge section connects the inlet section and the discharge section.

10. The battery device according to claim 1, characterized in that, The heat exchange assembly includes: The first plate, wherein the battery cell is connected to the first plate; The second plate is stacked on top of the first plate, and the first plate and the second plate together define a placement cavity, in which the first phase change structure is disposed.

11. The battery device according to claim 10, characterized in that, The second plate forms a first groove that opens toward the first plate, and the first plate closes the opening of the first groove to collectively define the placement cavity.

12. The battery device according to claim 10, characterized in that, The heat exchange assembly includes: The third plate, and the second plate forming a second groove opening toward the third plate, the third plate closing the opening of the second groove, together defining a heat exchange channel for the flow of heat exchange medium.

13. The battery device according to any one of claims 1 to 12, characterized in that, The heat exchange component is provided at the lower end of the battery cell in the direction of gravity.

14. The battery device according to any one of claims 1 to 12, characterized in that, The battery device includes: The housing has a receiving cavity, in which the at least two battery cells and the heat exchange assembly are disposed.

15. The battery device according to any one of claims 1 to 12, characterized in that, The battery device includes: The first busbar is connected to the electrode terminals of the battery cell, and the first busbar is provided with the heat exchange component.

16. The battery device according to any one of claims 1 to 12, characterized in that, The battery device includes: The distribution box includes a second busbar component, which is provided with the heat exchange assembly.

17. The battery device according to claim 16, characterized in that, The distribution box includes: The housing has a first opening, the second busbar is located inside the housing, and the heat exchange assembly is located outside the housing. The heat exchange assembly is connected to the second busbar through the first opening.

18. A heat exchange component, characterized in that, The heat exchange component is provided with a first phase change structure; the first phase change structure includes a skeleton and a first phase change material, the first phase change material is disposed on the skeleton, and the skeleton includes foam metal.

19. The heat exchange assembly according to claim 18, characterized in that, The heat exchange component is equipped with a second phase change structure.

20. The heat exchange assembly according to claim 19, characterized in that, The second phase change structure is a layered structure formed by the second phase change material.

21. The heat exchange assembly according to claim 18, characterized in that, The heat exchange component has heat exchange channels for circulating heat exchange medium.

22. The heat exchange assembly according to claim 21, characterized in that, The heat exchange channel includes: Entering the segment; At least two flow split sections, with the first phase change structure disposed between the two flow split sections; The discharge section connects the inlet section and the discharge section.

23. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 17.

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