Battery device and electric appliance

Abstract

Embodiments of the present application provide a heat exchange assembly, a battery device and an electric equipment. The battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly. The plurality of battery monomers are arranged in the box body, and the heat exchange assembly comprises at least two heat exchange members. At least one of the heat exchange members is arranged as a flexible member, and at least one of the heat exchange members is arranged as a rigid member. The flexible member and the rigid member are arranged in a stack to form at least one medium flow channel. The heat exchange assembly is arranged in contact with a pole side of the battery monomers. In the battery device provided by the embodiments of the present application, the heat exchange assembly is arranged in contact with the pole side of the battery monomers. Thus, the pole side of the battery monomers can be preferentially cooled, and the temperature difference in the longitudinal direction of the battery monomers is reduced as much as possible, so that a better heat exchange effect is obtained. Meanwhile, the heat exchange assembly comprises the flexible member, which helps to reduce the weight and improve the energy density of the battery device.

Description

Technical Field

[0001] The embodiments of this application relate to the field of battery technology, and more particularly to a heat exchange component, a battery device, and an electrical appliance. Background Technology

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

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

[0004] In view of this, embodiments of this application aim to provide a heat exchange component, a battery device, and an electrical device.

[0005] The first aspect of this application provides a battery device, the battery device comprising: a housing; a plurality of battery cells disposed within the housing; and a heat exchange assembly comprising at least two heat exchange elements, at least one of the heat exchange elements being a flexible element and at least one of the heat exchange elements being a rigid element, the flexible element and the rigid element being stacked to form at least one medium flow channel, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the plurality of battery cells, wherein the heat exchange assembly is in contact with the terminal side of the battery cells.

[0006] In the battery device provided in this application embodiment, the heat exchange component is arranged in contact with the terminal side of the battery cell. This allows for preferential cooling of the terminal side of the battery cell, minimizing the longitudinal temperature difference between the battery cells and achieving better heat exchange performance. Furthermore, at least one heat exchange element of the heat exchange component is a flexible element. The lightweight nature of the flexible element helps reduce the weight of the heat exchange component, thereby increasing the energy density of the battery device. Additionally, the flexibility of the flexible element allows for better fit between the heat exchange component and the housing and / or battery cells, facilitating the absorption of assembly tolerances. This eliminates the need for sealants or thermally conductive materials, improving the fit between the heat exchange component and the housing and / or battery cells, increasing the effective heat exchange area between them, and thus enhancing the heat exchange efficiency and performance of the heat exchange component. On the other hand, by setting at least one heat exchanger as a rigid component and stacking flexible components with rigid components to form at least one medium flow channel, the rigid component can support the flexible component, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0007] In some embodiments, in the orthographic projection along the distribution direction of the heat exchange component and the battery cell, the projection of the heat exchange component and the projection of the electrode of the battery cell are offset from each other.

[0008] In this embodiment, the heat exchange component is configured not to cover the terminal post. This allows the heat exchange component to fit better with the terminal post side of the battery cell, resulting in better heat exchange performance. Furthermore, it minimizes the probability of condensate flowing to the terminal post, thereby improving the reliability of the battery device.

[0009] In some embodiments, the battery cell includes two terminals spaced apart, the terminal side of the battery cell includes a central region and two shoulder regions, the central region being the region between the two terminals, the shoulder regions being the regions on the sides of the two terminals facing away from each other, the heat exchange assembly covering at least a portion of the central region, and / or, the heat exchange assembly covering at least a portion of the shoulder regions.

[0010] In this embodiment, the heat exchange component covers the middle area and / or shoulder area of ​​the terminal side of the battery cell, which helps to increase the heat exchange area and obtain a better heat exchange effect.

[0011] In some embodiments, the rigid member is disposed on the side facing the battery cell.

[0012] In this embodiment, the rigid component is disposed on the side facing the battery. The rigid component has good rigidity and can provide a certain limiting effect, reducing the probability of the battery cell shaking up and down during actual use.

[0013] In some embodiments, the heat exchange assembly further includes: a heat insulation layer connected to the heat exchanger, wherein each heat exchanger is located on the side of the heat insulation layer facing the battery cell.

[0014] In this embodiment, the heat insulation layer helps to suppress heat exchange between the side of the heat exchange component that is not in contact with the battery cell and the external environment, avoiding the waste of cold (or heat) and improving the efficiency of heat exchange between the heat exchange component and the battery cell. On the other hand, the heat insulation layer also helps to block the heat exchange between water vapor in the external environment and the heat exchange component to a certain extent, thereby suppressing the formation of condensate.

[0015] In some embodiments, along the distribution direction of the heat exchange assembly and the battery cell, a heat insulation cavity is formed between the heat insulation layer and the adjacent heat exchange component.

[0016] In this embodiment, by forming an insulation cavity between the insulation layer and the adjacent heat exchanger, the insulation effect can be further improved, thereby further improving the heat exchange efficiency and suppressing the generation of condensate.

[0017] In some embodiments, the insulation cavity is filled with an insulation medium.

[0018] In this embodiment, filling the insulation cavity with an insulation medium helps to further improve the insulation effect, thereby further improving the heat exchange efficiency and suppressing the generation of condensate.

[0019] In some embodiments, the insulation layer has a connecting portion connected to the heat exchanger, and the heat exchanger assembly includes a heat insulation body disposed between the connecting portion and the heat exchanger.

[0020] It is understood that the connection part is connected to the heat exchanger, which means that only the heat insulation layer itself provides heat insulation at this location, without the heat insulation cavity to assist in heat insulation, resulting in a relatively poor heat insulation effect. Therefore, in this embodiment, a heat insulation body is added between the connection part and the heat exchanger to further improve the heat insulation effect.

[0021] In some embodiments, the insulation layer is configured as a flexible structure.

[0022] In this embodiment, by setting the heat insulation layer as a flexible structure, it is helpful to further reduce the weight of the heat exchange components, thereby increasing the energy density of the battery device.

[0023] In some embodiments, at least one side surface of the heat exchange component has a capillary structure along the distribution direction of the heat exchange component and the battery cell.

[0024] In this embodiment, by setting a capillary structure on the surface of the heat exchange component, the condensate can be dispersed in the capillary structure, reducing the risk of insulation failure caused by the condensate accumulating into droplets and dripping.

[0025] In some embodiments, the capillary structure is connected to the surface of the heat exchange component, or the surface of the heat exchange component is surface-treated to form the capillary structure.

[0026] The capillary structure is connected to the surface of the heat exchange component, which allows the capillary structure and the heat exchange component to be manufactured separately and then connected together, thus reducing the manufacturing difficulty of the capillary structure and the heat exchange component.

[0027] The surface of the heat exchange component is treated to form a capillary structure. The capillary structure can be attached to the surface of the heat exchange component facing the battery cell through atomic or molecular forces, which can eliminate the assembly process between the capillary structure and the heat exchange component.

[0028] In some embodiments, the heat exchange assembly includes a connecting plate and a flow channel plate, the flow channel plate having a protrusion and a flow channel portion, the protrusion protruding toward the connecting plate to connect the connecting plate, the flow channel portion being spaced apart from the connecting plate to form the medium flow channel, one of the flexible member and the rigid member being the connecting plate, the other of the flexible member and the rigid member being the flow channel plate, and the surface of the flow channel plate facing away from the connecting plate having the capillary structure.

[0029] In this embodiment, the surface of the flow channel plate away from the connecting plate has a capillary structure. Since the flow channel plate has a protrusion and a flow channel, and the surface of the flow channel plate away from the connecting plate is curved, the specific surface area of ​​the flow channel plate can be increased, thereby increasing the area of ​​the capillary structure and enhancing the absorption performance of condensate.

[0030] In some embodiments, the heat exchange assembly includes a condensate collector, and the space on the side of the protrusion opposite to the connecting plate forms a recessed space, with the condensate collector located within at least a portion of the recessed space.

[0031] In this embodiment, the recessed space is a space formed by the protrusion protruding towards the bonding plate. Compared with the capillary structure on the flow channel, the capillary structure on the wall of the recessed space is relatively far away from the battery cell. The condensate collector is set in the recessed space. The condensate collector can collect condensate from the capillary structure as well as condensate from the external environment.

[0032] In some embodiments, the flow channel plate is disposed toward the battery cell, and the condensate collector is spaced apart from the battery cell.

[0033] In this embodiment, the condensate collector does not come into contact with the battery cells, which can prevent the battery cells from squeezing the condensate collector to a certain extent.

[0034] In some embodiments, the condensate collector does not protrude from the recessed space.

[0035] In this embodiment, the condensate collector does not protrude from the recessed space. In other words, in the stacking direction of the heat exchange components, the depth of the recessed space is not less than the thickness of the condensate collector. Even if the capillary structure on the flow channel abuts against the battery cell or other external structure, the condensate collector will not be squeezed.

[0036] In some embodiments, the capillary structure has a first pore, and the condensate collector has a second pore, the diameter of the second pore being smaller than the diameter of the first pore.

[0037] In this embodiment, both the capillary structure and the condensate collector have capillary forces. The diameter of the second hole is smaller than that of the first hole. Thus, the capillary force of the condensate collector is greater than that of the capillary structure. The condensate collector can absorb the condensate temporarily stored in the capillary structure, thereby increasing the condensate absorption capacity of the capillary structure.

[0038] In some embodiments, the flexible element includes a metallized film.

[0039] In this embodiment, since the metal plastic film is thin and light, and a medium flow channel is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange component can be reduced.

[0040] In some embodiments, the flexible element comprises an aluminum-plastic film.

[0041] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0042] In some embodiments, the flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked sequentially.

[0043] In this embodiment, the flexible component, composed of sequentially stacked metal and non-metal layers, is thin and lightweight. It is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the internally flowing heat exchange medium, eliminating the possibility of corrosion and leakage.

[0044] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or, the non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0045] By using one or more of aluminum foil, copper foil, and steel foil as the metal layer, the flexible component can have a certain structural strength and provide insulation. By using one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene as the non-metallic layer, the flexible component can have a certain degree of waterproofing.

[0046] In some embodiments, the non-metallic layer is a hot-melt layer.

[0047] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer together through hot melting, which is simple to form and has high production efficiency.

[0048] In some embodiments, the thickness of the flexible element is 0.05mm-0.3mm.

[0049] In this embodiment, by setting the thickness of the flexible component to 0.05mm-0.3mm, the heat exchange assembly made of the flexible component has a certain structural strength while making the overall thickness of the heat exchange assembly small, which is beneficial to reducing the overall volume and weight of the battery device and thus increasing the energy density of the battery device.

[0050] In some embodiments, the thickness of the flexible element is 0.08 mm to 0.2 mm.

[0051] In this embodiment, by setting the thickness of the flexible component to 0.08mm-0.2mm, the heat exchange assembly made of the flexible component has a certain structural strength, while further reducing the overall thickness of the heat exchange assembly. This is beneficial to further reduce the overall volume and weight of the battery device, thereby further increasing the energy density of the battery device.

[0052] In some embodiments, the elastic modulus of the flexible element is 0.1 MPa-10000 MPa.

[0053] In this embodiment, by setting the elastic modulus of the flexible component to 0.1MPa-10000MPa, the flexible component has a certain structural strength, which improves the reliability of the heat exchange assembly, and also has a certain deformation capacity. This can improve the fit between the heat exchange assembly and the housing and / or battery cells, thereby increasing the effective heat exchange area between the heat exchange assembly and the housing and / or battery cells, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0054] In some embodiments, the rigid member is a metal plate.

[0055] In this embodiment, by setting the rigid component as a metal plate, the metal plate has both good structural strength and good thermal conductivity.

[0056] A second aspect of the present application provides an electrical device that includes a battery device according to the first aspect of the present application.

[0057] The heat exchange components and electrical devices of the present application embodiments have all the advantages of the battery devices described in any of the above embodiments, and will not be repeated here. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0059] Figure 2 This is an exploded perspective view of a battery device provided in an embodiment of this application;

[0060] Figure 3 This is a schematic diagram showing the arrangement of the battery cells in a heat exchange assembly provided in an embodiment of this application.

[0061] Figure 4 for Figure 3 A schematic diagram of the AA cross-section of one of the heat exchange components;

[0062] Figure 5 for Figure 4 Enlarged schematic diagram of part B in the middle;

[0063] Figure 6 This is a partial cross-sectional schematic diagram of a heat exchange component provided in another embodiment of this application.

[0064] Explanation of reference numerals in the attached figures

[0065] 1000, Vehicle; 100, Battery Unit; 10, Battery Cell; 11, Terminal Post; 20, Housing; 21, First Sub-Housing; 22, Second Sub-Housing; 30, Heat Exchange Assembly; 30a, Medium Flow Channel; 31, Flexible Component; 311, Protrusion; 312, Flow Channel; 31a, Recessed Space; 32, Rigid Component; 33, Connector; 34, Insulation Layer; 34a, Insulation Chamber; 35, Insulation Body; 36, Capillary Structure; 37, Condensate Collector; 40, Piping; 200, Controller; 300, Motor. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0067] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0068] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0069] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0070] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0072] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0073] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0074] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0075] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0076] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0077] The battery cell 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.

[0078] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, 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 while allowing active ions to pass through.

[0079] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0080] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0081] In some implementations, the electrode assembly is a stacked structure.

[0082] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0083] 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.

[0084] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0085] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0086] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0087] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0088] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0089] In some embodiments, the battery cell 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 to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component 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.

[0090] As an example, the battery cell 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 batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0091] 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.

[0092] In some embodiments, at least one terminal post is provided on the housing, and the terminal post is electrically connected to the tab. The terminal post can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The terminal post can be provided on the end cap or on the housing.

[0093] During the use of a battery device, the individual battery cells within the device generate heat. Excessive heat can adversely affect the performance and lifespan of the battery device. Related technologies utilize a cooling system installed within the battery pack to cool the individual battery cells.

[0094] This application points out that, in actual use, the temperature near the terminals of a battery cell is typically high. However, cooling systems in related technologies usually exchange heat with the large surface area (the surface with the largest area among all surfaces) and / or the bottom surface (the surface opposite the terminals) of the battery cell. This arrangement may result in a large temperature difference between the battery cells along the longitudinal direction. Furthermore, related technologies typically use aluminum water-cooled plates for cooling, which results in significant weight.

[0095] In view of this, embodiments of this application provide a battery device, which includes a housing, a plurality of battery cells, and a heat exchange assembly. The plurality of battery cells are disposed within the housing, and the heat exchange assembly includes at least two heat exchange elements, at least one of which is a flexible element and at least one of which is a rigid element. The flexible element and the rigid element are stacked to form at least one medium flow channel. The at least one medium flow channel is used to conduct a heat exchange medium, which is used to exchange heat with the plurality of battery cells. The heat exchange assembly is in contact with the terminal side of the battery cells.

[0096] In the battery device provided in this application embodiment, the heat exchange component is arranged in contact with the terminal side of the battery cell. This allows for preferential cooling of the terminal side of the battery cell, minimizing the longitudinal temperature difference between the battery cells and achieving better heat exchange performance. Furthermore, at least one heat exchange element of the heat exchange component is a flexible element. The lightweight nature of the flexible element helps reduce the weight of the heat exchange component, thereby increasing the energy density of the battery device. Additionally, the flexibility of the flexible element allows for better fit between the heat exchange component and the housing and / or battery cells, facilitating the absorption of assembly tolerances. This eliminates the need for sealants or thermally conductive materials, improving the fit between the heat exchange component and the housing and / or battery cells, increasing the effective heat exchange area between them, and thus enhancing the heat exchange efficiency and performance of the heat exchange component. On the other hand, by setting at least one heat exchanger as a rigid component and stacking flexible components with rigid components to form at least one medium flow channel, the rigid component can support the flexible component, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0097] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical device includes the battery device of any embodiment of this application, and the battery device is used to provide electrical energy.

[0098] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0099] It should be noted that the technical solutions described in the embodiments of this application are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices. However, for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0100] Reference Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment 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, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0101] Reference Figure 2To meet different power demands, the battery device 100 includes multiple battery cells 10, where each battery cell 10 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration, where some cells are connected in series and others in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly is housed within a housing 20. Alternatively, the battery device 100 can consist of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, which are then connected in series, parallel, or in a mixed configuration to form a whole, housed within the housing 20. The battery device 100 may also include other structures, such as a busbar for electrical connection between the multiple battery cells 10. Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. A battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0102] Reference Figures 2-6 This application provides a battery device 100, which includes a housing 20, a plurality of battery cells 10, and a heat exchange assembly 30. The plurality of battery cells 10 are disposed within the housing 20. The heat exchange assembly 30 includes at least two heat exchange elements, at least one of which is a flexible element 31 and at least one of which is a rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. The at least one medium flow channel 30a is used to conduct heat exchange medium, which is used to exchange heat with the plurality of battery cells 10. The heat exchange assembly 30 is in contact with the terminal side of the battery cells 10.

[0103] The "multiple" mentioned in the embodiments of this application refers to two or more.

[0104] Please refer to Figure 2 The battery device 100 includes a housing 20 and a plurality of battery cells 10, with the plurality of battery cells 10 disposed within the housing 20.

[0105] The enclosure 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the enclosure 20 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0106] The housing 20 is used to encapsulate the battery cell 10. The housing 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 10.

[0107] As an example, the box 20 is typically a cuboid structure. The length and width directions of the box 20 are parallel to the horizontal plane, and the length direction of the box 20 is parallel to the longest side of its cuboid structure. The height of the box 20 is perpendicular to the ground.

[0108] As an example, refer to Figure 2 Along the height direction, the housing 20 includes a first sub-housing 21 and a second sub-housing 22, which together form a receiving cavity, in which the battery cell 10 is disposed. As an example, one of the first sub-housing 21 and the second sub-housing 22 is a top cover, and the other is a lower housing.

[0109] Reference Figure 4 The heat exchange assembly 30 includes at least two heat exchange elements, at least one of which is a flexible element 31 and at least one of which is a rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. The at least one medium flow channel 30a is used to conduct heat exchange medium for exchanging heat with multiple battery cells 10.

[0110] Here, the flexibility in flexible component 31 refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus. As an example, the material of flexible component 31 can be selected as a material that is lighter than conventional aluminum plates, steel plates, and other structures, and its flexibility can be controlled by the thickness, width, length, and type of material of flexible component 31.

[0111] By configuring the heat exchange component 30 to include a flexible member 31 in this embodiment, the weight of the heat exchange component 30 is reduced, thereby increasing the energy density of the battery device 100.

[0112] Furthermore, the flexible component 31 has certain expandable or contractible characteristics. It can also be understood that the flexible component 31 can be an elastically deformable structure. The flexible component 31 has the ability to deform and recover its deformation, so that the heat exchange assembly 30 can adapt to the external contour shape of the battery cell 10 or other components through a certain elastic deformation, thereby improving the fit between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, and thus improving the heat exchange efficiency.

[0113] Here, the rigidity of the rigid component 32 refers to the material properties of the structure. This type of property can be due to the material's weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus. As an example, the material of the rigid component 32 can be a conventional metal plate such as aluminum or steel, or a composite material. Its rigidity can be controlled by the thickness, width, length, and type of material of the rigid component 32. In this embodiment, by setting the heat exchange assembly 30 to include the rigid component 32, it can support the flexible component 31, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 30.

[0114] By configuring the heat exchange component 30 to include a flexible component 31 and a rigid component 32, the heat exchange component 30 can have a flexible function while also having a certain structural strength.

[0115] The flexible function of the heat exchange component 30 allows the heat exchange surface of the heat exchange component 30 to fit better with the battery cell 10, further improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0116] The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. This means that the heat exchange assembly 30 forms the medium flow channel 30a between the flexible element 31 and the rigid element 32. In other words, the flexible element 31 constitutes at least a portion of the sidewall of the medium flow channel 30a, and the rigid element 32 also constitutes at least a portion of the sidewall of the medium flow channel 30a. The heat exchange medium flows within the medium flow channel 30a to exchange heat with the battery cell 10.

[0117] As an example, the surface of the flexible member 31 facing the rigid member 32 is recessed to form a flow channel groove, and the surface of the rigid member 32 facing the flexible member 31 is flat. This flat surface and the flow channel groove enclose a medium flow channel 30a. Alternatively, the surface of the rigid member 32 facing the flexible member 31 is recessed to form a flow channel groove, and the surface of the flexible member 31 facing the rigid member 32 is flat. This flat surface and the flow channel groove enclose a medium flow channel 30a. Or, both the surfaces of the flexible member 31 and the rigid member 32 facing each other are recessed to form flow channel grooves, and the flow channel grooves of the flexible member 31 and the rigid member 32 enclose a medium flow channel 30a.

[0118] The medium flow channel 30a is used to conduct the heat exchange medium. It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a heat exchange effect on the battery cell 10. For example, it can be gaseous or liquid. In this embodiment, a coolant is used as an example for the heat exchange medium.

[0119] The specific number of medium flow channels 30a is not limited here. There can be one or more.

[0120] The phrase "at least one heat exchanger is configured as a flexible element 31" means that the number of flexible elements 31 is one or more. In embodiments where multiple heat exchangers are configured as flexible elements 31, the flexible elements 31 may be the same or different.

[0121] The phrase "at least one heat exchanger is a rigid member 32" means that the number of rigid members 32 is one or more. In embodiments where multiple heat exchangers are configured as rigid members 32, the rigid members 32 may be the same or different.

[0122] As an example, the heat exchange assembly 30 includes two heat exchange elements, one of which is a flexible element 31 and the other is a rigid element 32. As an example, the heat exchange assembly 30 includes three or more heat exchange elements, of which at least two are flexible elements 31 or at least two are rigid elements 32, with the flexible elements 31 and the rigid elements 32 alternating.

[0123] As an example, the rigid component 32 is a rigid plate structure that can support the flexible component 31, thereby improving the overall structural strength and stability of the heat exchange assembly 30.

[0124] As an example, the heat exchanger has an inlet and an outlet, both of which are connected to the medium flow channel 30a. Here, the inlet and outlet are used for the heat exchange medium to enter and exit the medium flow channel 30a. The aforementioned inlet and / or outlet can be formed by a rigid member 32 or by a flexible member 31.

[0125] As an example, refer to Figure 2 The heat exchange assembly 30 also includes a connector 33 communicating with the inlet and a connector 33 communicating with the outlet. As an example, the connector 33 includes a water tap. As an example, both the inlet and the outlet are formed on the rigid member 32, and the connector 33 is brazed to the rigid member 32.

[0126] As an example, refer to Figure 2 The battery device 100 also includes a conduit 40 connected to the connector 33, the conduit 40 being used to connect to an external heat exchange medium source.

[0127] The principle of heat exchange component 30 for heat exchange of battery cell 10 is as follows: the heat exchange medium output from the heat exchange medium source (not shown in the figure) enters the medium flow channel 30a through the inlet of heat exchange component 30. After the heat exchange medium exchanges heat with battery cell 10, the heat exchange medium flows out through the outlet of heat exchange component 30, thus completing the heat exchange of battery cell 10.

[0128] Here, the heat exchange component 30 can exchange heat with the battery cell 10 by either dissipating heat from the battery cell 10 or by heating the battery cell 10.

[0129] The principle of heat exchange component 30 for heat dissipation of battery cell 10 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 30a through the inlet of heat exchange component 30. After the heat exchange medium absorbs the heat generated by battery cell 10 during operation, the heat exchange medium flows out through the outlet of heat exchange component 30, releasing the heat and completing the cooling and heat dissipation of battery cell 10.

[0130] The principle of the heat exchange component 30 heating the battery cell 10 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 30a through the inlet of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell 10 to heat the battery cell 10. After heating the battery cell 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, thus completing the heating of the battery cell 10.

[0131] Reference Figure 3 The heat exchange component 30 is configured to contact the electrode side of the battery cell 10.

[0132] Here, the terminal side of the battery cell 10 specifically refers to the side where the terminal 11 of the battery cell 10 is located. The heat exchange assembly 30 can be in direct contact with the terminal side of the battery cell 10, or indirect contact via an intermediate medium.

[0133] It is understandable that in actual use, the temperature of the terminal side of the battery cell 10 is usually higher than the temperature of the opposite side. In related technologies, the cooling structure is placed in contact with the opposite side. Since the heat exchange effect gradually decreases with increasing distance, this increases the temperature difference between the terminal side and the opposite side. In this embodiment, the heat exchange component 30 is placed in contact with the terminal side of the battery cell 10. This allows for preferential cooling of the terminal side of the battery cell 10, thereby helping to reduce the temperature difference in the longitudinal direction of the battery cell 10.

[0134] It should be noted that, in this embodiment, the terminal post 11 of the battery cell 10 can be disposed on the top side of the battery cell 10 or on the bottom side of the battery cell 10. Figure 2 In the embodiment shown, the electrode post 11 is disposed on the bottom side of the battery cell 10.

[0135] It should also be noted that, in addition to the heat exchange component 30 mentioned above, the battery device 100 may also include other heat exchange structures. These heat exchange structures may be arranged in contact with the other side of the battery cell 10 opposite to the terminal side, and / or in contact with the large surface side of the battery cell 10. Here, the large surface refers to the surface with the largest area among all surfaces of the battery cell 10.

[0136] In the battery device 100 provided in this application embodiment, the heat exchange component 30 is arranged in contact with the terminal side of the battery cell 10. In this way, the terminal side of the battery cell 10 can be cooled preferentially, thereby minimizing the temperature difference in the longitudinal direction of the battery cell 10 and obtaining a better heat exchange effect.

[0137] On the other hand, at least one heat exchange element of the heat exchange assembly 30 is configured as a flexible element 31. The flexible element 31 is lightweight, which helps to reduce the weight of the heat exchange assembly 30 and thus improve the energy density of the battery device 100. Furthermore, the flexible element 31 has a certain degree of flexibility, which allows the heat exchange assembly 30 to fit better with the housing 20 and / or the battery cell 10. This helps to absorb the assembly tolerances of the heat exchange assembly 30, eliminating the need for sealant or thermally conductive materials, improving the fit between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, increasing the effective heat exchange area between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0138] On the other hand, by setting at least one heat exchanger as a rigid member 32, and stacking the flexible member 31 with the rigid member 32 to form at least one medium flow channel 30a, the rigid member 32 can support the flexible member 31, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 30, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0139] In some embodiments, refer to Figure 3 In the orthographic projection along the distribution direction of the heat exchange component 30 and the battery cell 10, the projection of the heat exchange component 30 and the projection of the electrode post 11 of the battery cell 10 are offset from each other.

[0140] That is, in this embodiment, the heat exchange component 30 does not cover the terminal post 11 of the battery cell 10. In other words, the heat exchange component 30 avoids the terminal post 11 of the battery cell 10.

[0141] It should be noted that, here, the projection of the heat exchange component 30 and the projection of the terminal post 11 of the battery cell 10 are offset from each other, meaning that the projection of any heat exchange component 30 and the projection of the terminal post 11 of each battery cell 10 are offset from each other.

[0142] It is understood that the terminals 11 of each battery cell 10 in the battery device 100 usually protrude from other positions on the terminal side of the battery cell 10. If the heat exchange component 30 covers the terminals 11, there may be a certain gap between the heat exchange component 30 and other positions on the terminal side of the battery cell 10, which will affect the heat exchange effect. Therefore, in this embodiment, the heat exchange component 30 is set not to cover the terminals 11, so that the heat exchange component 30 can fit better with the terminal side of the battery cell 10 and obtain a better heat exchange effect.

[0143] On the other hand, it is understood that the terminals 11 of the battery cell 10 are the input and output terminals of the current. This requires the structure near the terminals 11 to have good insulation performance to prevent short circuits. When the battery device 100 operates in a relatively humid environment, since the temperature of the heat exchange component 30 is lower than the ambient temperature, water vapor in the air may condense on the surface of the heat exchange component 30 to form condensate. The condensate flowing to the battery cell 10 can cause insulation failure, especially if the condensate flows to the terminals 11, which may cause a short circuit in the battery device 100. In this embodiment, the heat exchange component 30 is configured not to cover the terminals 11. This can minimize the probability of condensate flowing to the terminals 11, thereby improving the reliability of the battery device 100.

[0144] In some embodiments, refer to Figure 3 The battery cell 10 includes two pole posts 11 spaced apart. The pole post side of the battery cell 10 includes a central region and two shoulder regions. The central region is the region between the two pole posts 11, and the shoulder regions are the regions on the sides of the two pole posts 11 that are away from each other. The heat exchange assembly 30 covers at least a portion of the central region, and / or the heat exchange assembly 30 covers at least a portion of the shoulder regions.

[0145] In this embodiment, the heat exchange component 30 may only cover the shoulder area and not the middle area, for example, in Figure 3 In the illustrated embodiment, the heat exchange assembly 30 covers the shoulder region on the terminal side of the battery cell 10, but does not cover the middle region. Alternatively, the heat exchange assembly 30 may cover only the middle region and not the shoulder region, or the heat exchange assembly 30 may cover both the middle region and the shoulder region.

[0146] Furthermore, the heat exchange component 30 may cover only a portion of the shoulder area of ​​the battery cell 10, or it may cover the entire shoulder area of ​​the battery cell 10. Similarly, the heat exchange component 30 may cover only a portion of the middle area of ​​the battery cell 10, or it may cover the entire middle area of ​​the battery cell 10.

[0147] In this embodiment, multiple heat exchange components 30 can be set to cover the middle area and / or shoulder area and avoid the pole post 11. The specific setting method can be determined by those skilled in the art based on the actual arrangement of the battery cells 10.

[0148] In this embodiment, the heat exchange component 30 covers the middle region and / or shoulder region of the electrode side of the battery cell 10, which helps to increase the heat exchange area and obtain a better heat exchange effect.

[0149] In some embodiments, the rigid member 32 is disposed on the side facing the battery cell 10.

[0150] Here, the rigid member 32 being located on the side facing the battery cell 10 specifically means that among the heat exchange members of the heat exchange assembly 30, the heat exchange member closest to the battery cell 10 is the rigid member 32.

[0151] In this embodiment, the rigid member 32 is disposed on the side facing the battery. The rigid member 32 has good rigidity and can provide a certain limiting effect, reducing the probability of the battery cell 10 shaking up and down during actual use.

[0152] Of course, in some other embodiments, the flexible element 31 may be disposed on the side facing the battery cell 10. The flexible element 31 can fit more closely with the battery cell 10, thereby increasing the heat exchange area and obtaining a better heat exchange effect.

[0153] In some embodiments, refer to Figure 4 The heat exchange assembly 30 also includes a heat insulation layer 34 connected to the heat exchanger, and each heat exchanger is located on the side of the heat insulation layer 34 facing the battery cell 10.

[0154] Here, the thermal insulation in the thermal insulation layer 34 refers to the material properties of the structure. These properties can be due to the low thermal conductivity of the material. Specifically, the thermal conductivity of the thermal insulation layer 34 is lower than that of the rigid component 32 and the flexible component 31. As an example, the material of the thermal insulation layer 34 can be glass fiber, asbestos, rock wool, silicate materials, etc.

[0155] The specific connection method between the heat insulation layer 34 and the connector 33 is not limited, such as bonding, welding, snap-fitting, fastener connection, etc.

[0156] Each heat exchanger is located on the side of the heat insulation layer 34 facing the battery cell 10. That is, the heat insulation layer 34 is further away from the battery cell 10 than each heat exchanger. For example, the surface of the heat exchange assembly 30 facing away from the battery cell 10 is formed by the heat insulation layer 34. That is, the heat insulation layer 34 is located on the outermost side in the direction away from the battery cell 10.

[0157] In this embodiment, the heat insulation layer 34 helps to suppress heat exchange between the side of the heat exchange assembly 30 that is not in contact with the battery cell 10 and the external environment, avoiding the waste of cold (or heat) and improving the efficiency of heat exchange between the heat exchange assembly 30 and the battery cell 10. On the other hand, the heat insulation layer 34 also helps to block the heat exchange between water vapor in the external environment and the heat exchange component to a certain extent, thereby suppressing the formation of condensate.

[0158] In some embodiments, along the distribution direction of the heat exchange assembly 30 and the battery cell 10, a heat insulation cavity 34a is formed between the heat insulation layer 34 and the adjacent heat exchange component.

[0159] In this embodiment, by forming an insulation cavity 34a between the insulation layer 34 and the adjacent heat exchanger, the insulation effect is further improved, thereby further improving the heat exchange efficiency and suppressing the generation of condensate.

[0160] It should be noted that in some embodiments, a heat insulation cavity 34a may not be formed between the heat insulation layer 34 and the adjacent heat exchange element. For example, the heat insulation layer 34 may be a heat insulation coating applied to the surface of the heat exchange element.

[0161] In some embodiments, the insulation cavity 34a is filled with an insulation medium.

[0162] The specific type of insulation medium is not limited here, as long as it can achieve the insulation effect (that is, it has a low thermal conductivity). The insulation medium can be solid, liquid, gaseous or a mixture of multiple phases.

[0163] Taking gaseous insulation media as an example, insulation media include, but are not limited to, dry air (e.g., air with a relative humidity of less than 40%, or air with a dew point temperature of less than or equal to -40°C), inert gases, nitrogen, etc. The advantage of using gaseous insulation media is that it can achieve better insulation effect while further reducing the weight of the heat exchange medium.

[0164] The heat insulation medium can be filled into the heat insulation cavity 34a during the manufacturing process of the heat exchange component 30. Specifically, during the manufacturing process, the heat insulation medium is first filled into the heat insulation cavity 34a, and then the heat insulation layer 34 is sealed and connected to the heat exchange component.

[0165] Alternatively, the insulation medium can be filled into the insulation cavity 34a after the manufacturing process is completed. For example, pipes 40, valves, etc. for filling the insulation medium can be provided on the insulation layer 34 and / or the heat exchange component.

[0166] In this embodiment, filling the insulation cavity 34a with an insulation medium helps to further improve the insulation effect, thereby further improving the heat exchange efficiency and suppressing the generation of condensate.

[0167] Of course, in some other embodiments, the insulation cavity 34a may not be filled with an insulation medium, but may be formed as a vacuum cavity.

[0168] In some embodiments, refer to Figure 5 The insulation layer 34 has a connecting part, which is connected to the heat exchange component. The heat exchange assembly 30 includes a heat insulation body 35, which is disposed between the connecting part and the heat exchange component.

[0169] Here, the connecting portion specifically refers to the part of the heat insulation layer 34 used for connecting with the heat exchanger. As an example, the heat insulation layer 34 is generally a flat plate structure, and the outer periphery of the heat insulation layer 34 forms the connecting portion, which is connected to the surface of the heat exchanger opposite to the battery cell 10. Here, the connection method between the connecting portion and the heat exchanger includes, but is not limited to, bonding, welding, etc.

[0170] The specific material of the heat insulation body 35 is not limited. The material of the heat insulation body 35 can be the same as the material of the heat insulation layer 34 or different from the material of the heat insulation layer 34.

[0171] It is understood that the connection part is connected to the heat exchanger, which means that only the heat insulation layer 34 itself provides heat insulation at this location, without the heat insulation cavity 34a to assist in heat insulation, resulting in a relatively poor heat insulation effect. Therefore, in this embodiment, a heat insulation body 35 is added between the connection part and the heat exchanger to further improve the heat insulation effect.

[0172] In some embodiments, in the orthographic projection along the distribution direction of the heat exchange assembly 30 and the battery cell 10, the projection of the heat insulation body 35 completely covers the projection of the connection portion, thereby further improving the heat insulation effect.

[0173] In some embodiments, the insulation layer 34 is configured as a flexible structure.

[0174] Similar to flexible component 31, the flexibility in flexible structure refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus.

[0175] In this embodiment, by setting the heat insulation layer 34 as a flexible structure, it helps to further reduce the weight of the heat exchange component 30, thereby increasing the energy density of the battery device 100.

[0176] In some embodiments, refer to Figure 6 Along the distribution direction of the heat exchange component 30 and the battery cell 10, at least one side surface of the heat exchange component 30 has a capillary structure 36.

[0177] Here, the heat exchange component 30 may have a capillary structure 36 on the side of the heat exchange component 30 facing the battery cell 10, or the heat exchange component 30 may have a capillary structure 36 on the side of the heat exchange component 30 away from the battery cell 10, or both sides may have a capillary structure 36.

[0178] The capillary structure 36 specifically refers to a structure capable of generating capillary forces to drive liquid flow. For example, the capillary structure 36 may have multiple first pores. The size of the first pores is at the micrometer level; for example, the pore diameter of the first pore is no greater than 1 mm. Preferably, the pore diameter of the first pore is between 1 μm and 100 μm. The basic principle is to achieve spontaneous liquid flow through the synergistic effect of the surface tension of the liquid and the first pores of the capillary structure 36.

[0179] The capillary structure 36 can absorb condensate, which is the liquid formed by the condensation of water vapor inside the housing 20. This reduces the risk of water vapor condensing into droplets.

[0180] The pore size of the first pore can be measured by gas adsorption and / or mercury porosimetry.

[0181] The principle of mercury intrusion porosimetry is to use high-pressure mercury to penetrate the pores and calculate the pore size distribution by the amount of mercury intruded. For details, please refer to "GB / T 21650.1-2008 Mercury Intrusion Porosimetry and Gas Adsorption Method for Determination of Pore Size Distribution and Porosity of Solid Materials".

[0182] The principle of gas adsorption method is based on the analysis of pore size using gas adsorption isotherms (such as the BET method). For details, please refer to "GB / T19587-2017 Determination of Specific Surface Area of ​​Solid Substances by Gas Adsorption BET Method" and "GB / T21650.2-2008 Analysis of Mesopores and Macropores by Gas Adsorption Method".

[0183] In this embodiment, by providing a capillary structure 36 on the surface of the heat exchange component 30, condensate can be dispersed in the capillary structure 36, reducing the risk of insulation failure caused by condensate accumulating into droplets and dripping.

[0184] It is understandable that the insulation layer 34 described above inhibits the formation of condensate by blocking heat exchange between the heat exchange component 30 and the outside air. In contrast, the capillary structure 36 in this embodiment adsorbs condensate even when it has already formed. Both structures can reduce the risk of insulation failure, but their mechanisms of action differ.

[0185] Furthermore, since the thermal insulation layer 34 itself has a low thermal conductivity, it can only be placed on the side away from the battery cell 10, and cannot be placed on the surface where the heat exchange component 30 contacts the battery cell 10. However, the capillary structure 36 itself does not affect the thermal conductivity, so it can be placed on the surface where the heat exchange component 30 contacts the battery cell 10, thereby filling the blind spot of the thermal insulation layer 34.

[0186] Those skilled in the art can selectively configure one of the two structures described above, or configure both structures simultaneously, according to actual usage requirements. A capillary structure 36 is provided on the side of the heat exchange component 30 facing the battery cell 10, and a heat insulation layer 34 is provided on the side facing away from the battery cell 10. Alternatively, a heat insulation layer 34 may be provided on the side of the heat exchange component 30 facing away from the battery cell 10, and capillary structures 36 may be provided on both the surfaces of the heat exchange component 30 facing and facing away from the battery cell 10.

[0187] As mentioned above, the surface of the heat exchange assembly 30 facing away from the battery cell 10 is formed by a heat insulation layer 34. In this embodiment, a capillary structure 36 may be provided in the heat insulation layer 34.

[0188] The following description will primarily focus on the capillary structure 36 disposed in the heat exchanger as an example. However, those skilled in the art will understand that, unless otherwise specified, the related structures described below are also applicable to the capillary structure 36 disposed in the insulation layer 34.

[0189] In some embodiments, the capillary structure 36 is connected to the surface of the heat exchange assembly 30.

[0190] As an example, the capillary structure 36 can be bonded to the surface of the heat exchange component 30. Bonding methods include, but are not limited to, adhesives or double-sided tape.

[0191] The capillary structure 36 can also be attached to the surface of the heat exchange component 30 by hot pressing, welding or other means.

[0192] In this embodiment, the capillary structure 36 and the heat exchange component 30 can be manufactured separately and then connected together, which can reduce the manufacturing difficulty of the capillary structure 36 and the heat exchange component 30.

[0193] In some embodiments, the surface of the heat exchange component 30 is surface treated to form capillary structures 36.

[0194] Surface treatment refers to the process of changing the surface properties of materials through physical or chemical means.

[0195] As an example, chemical etching can be performed on the surface of the rigid member 32 or the flexible member 31 to form the capillary structure 36. As another example, a coating can be deposited on the surface of the rigid member 32 or the flexible member 31 to form the capillary structure 36.

[0196] In this embodiment, the surface of the heat exchange component 30 is surface treated to form a capillary structure 36. The capillary structure 36 can be attached to the surface of the heat exchange component 30 facing the battery cell 10 by atomic or molecular forces, which can eliminate the assembly process between the capillary structure 36 and the heat exchange component 30.

[0197] In some embodiments, refer to Figure 6 The heat exchange assembly 30 includes a connecting plate and a flow channel plate. The flow channel plate has a protrusion 311 and a flow channel portion 312. The protrusion 311 protrudes toward the connecting plate to connect with the connecting plate. The flow channel portion 312 is spaced apart from the connecting plate to form a medium flow channel 30a. One of the flexible member 31 and the rigid member 32 is the connecting plate, and the other of the flexible member 31 and the rigid member 32 is the flow channel plate. The surface of the flow channel plate facing away from the connecting plate has a capillary structure 36.

[0198] Both the bonding plate and the flow channel plate have a layered structure. A layered structure refers to a structure in which one or more layers are spread out in a planar or curved form. The layers can be parallel to each other or stacked regularly.

[0199] The bonding plate can be a flat plate structure, which means that the two surfaces of the plate along the stacking direction are basically planar. Of course, the bonding plate can also be a non-flat plate structure.

[0200] The flexible component 31 and the rigid component 32 are both either a connecting plate or a flow channel plate. This means that if the flexible component 31 is a connecting plate, then the rigid component 32 is a flow channel plate; and if the rigid component 32 is a connecting plate, then the flexible component 31 is a flow channel plate. Figure 6 In the illustrated embodiment, the flexible element 31 is a flow channel plate.

[0201] As an example, the flexible member 31 is a connecting plate, and the rigid member 32 is a flow channel plate. The rigid member 32 has a protrusion 311 and a flow channel 312. The protrusion 311 protrudes toward and connects to the flexible member 31, and the space between the flow channel 312 and the flexible member 31 is a medium flow channel 30a. Here, the rigid member 32 can be formed by a stamping process to form the protrusion 311 and the flow channel 312.

[0202] As an example, the rigid member 32 is a connecting plate, and the flexible member 31 is a flow channel plate. The flexible member 31 has a protrusion 311 and a flow channel 312. The protrusion 311 protrudes toward and connects to the rigid member 32, and the space between the flow channel 312 and the rigid member 32 is a medium flow channel 30a. Here, the flexible member 31 can be formed by a hot pressing process to form the protrusion 311 and the flow channel 312.

[0203] In this embodiment, the surface of the flow channel plate away from the connecting plate has a capillary structure 36. Since the flow channel plate has a protrusion 311 and a flow channel 312, and the surface of the flow channel plate away from the connecting plate is curved, the specific surface area of ​​the flow channel plate can be increased, thereby increasing the area of ​​the capillary structure 36 and enhancing the absorption performance of condensate.

[0204] In some embodiments, refer to Figure 6The heat exchange assembly 30 includes a condensate collector 37. The protrusion 311 forms a recessed space 31a on the side opposite to the connecting plate, and at least a portion of the recessed space 31a contains the condensate collector 37.

[0205] The condensate collector 37 can provide condensate collection. The condensate collector 37 can be a structure capable of generating capillary forces to drive liquid flow.

[0206] The condensate collector 37 may have multiple second holes. The size of the second holes is on the micrometer scale; for example, the pore diameter of the second hole is less than 1 mm. Preferably, the pore diameter of the second hole is between 1 μm and 100 μm. The basic principle is to achieve spontaneous liquid flow through the surface tension of the liquid and the synergistic effect of the second holes.

[0207] The pore size of the second pore can be measured by gas adsorption and / or mercury porosimetry. The methods for gas adsorption and mercury porosimetry are described above and will not be repeated here.

[0208] Having a condensate collector 37 in at least part of the recessed space 31a means that it may be that a part of the recessed space 31a has a condensate collector 37, while another part of the recessed space 31a does not have a condensate collector 37; or it may be that all the recessed spaces 31a have a condensate collector 37.

[0209] In this embodiment, the recessed space 31a is a space formed by the protrusion 311 protruding towards the bonding plate. Compared with the capillary structure 36 on the flow channel 312, the capillary structure 36 on the wall of the recessed space 31a is relatively far away from the battery cell 10. The condensate collector 37 is set in the recessed space 31a. The condensate collector 37 can collect condensate from the capillary structure 36 and condensate from the external environment.

[0210] In some embodiments, the flow channel plate is disposed toward the battery cell 10, and the condensate collector 37 is spaced apart from the battery cell 10.

[0211] In this embodiment, the condensate collector 37 does not come into contact with the battery cell 10, which can prevent the battery cell 10 from squeezing the condensate collector 37 to a certain extent.

[0212] In some embodiments, the condensate collector 37 does not protrude from the recessed space 31a.

[0213] As an example, in the stacking direction of the heat exchange assembly 30, the depth of the recessed space 31a is not less than the thickness of the condensate collector 37. The depth of the recessed space 31a refers to its dimension along the stacking direction, and the thickness of the condensate collector 37 is its dimension along the stacking direction. If the depth of the recessed space 31a is greater than the thickness of the condensate collector 37, then the entire condensate collector 37 is located within the recessed space 31a. If the depth of the recessed space 31a is equal to the thickness of the condensate collector 37, then the surface of the condensate collector 37 facing the battery cell 10 is flush with the plane containing the opening of the recessed space 31a.

[0214] In this embodiment, the condensate collector 37 does not protrude from the recessed space 31a. In other words, in the stacking direction of the heat exchange assembly 30, the depth of the recessed space 31a is not less than the thickness of the condensate collector 37. Even if the capillary structure 36 on the flow channel 312 abuts against the battery cell 10 or other external structures, the condensate collector 37 will not be squeezed.

[0215] In some embodiments, the capillary structure 36 has a first hole, and the condensate collector 37 has a second hole, the diameter of which is smaller than that of the first hole.

[0216] The first and second holes can both be as described above, and will not be repeated here.

[0217] In this embodiment, both the capillary structure 36 and the condensate collector 37 have capillary forces. The diameter of the second hole is smaller than that of the first hole. Thus, the capillary force of the condensate collector 37 is greater than that of the capillary structure 36. The condensate collector 37 can absorb the condensate temporarily stored in the capillary structure 36, thereby increasing the amount of condensate absorbed by the capillary structure 36.

[0218] In some embodiments, the flexible element 31 includes a metallized film.

[0219] The flexible component 31 is a single-layer or multi-layer thin film.

[0220] In this embodiment, since the metal plastic film is thin and light, and the medium flow channel 30a is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet the large thickness requirement. Therefore, the overall thickness and weight of the heat exchange component 30 can be reduced.

[0221] In some embodiments, the flexible element 31 includes an aluminum-plastic film.

[0222] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0223] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, which are stacked sequentially.

[0224] Here, the flexible component 31 includes a metal layer and a non-metal layer, that is, a composite material component composed of a metal layer and a non-metal layer.

[0225] As an example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0226] There is no limit to the number of metal and non-metal layers.

[0227] In this embodiment, the flexible component 31, which is composed of sequentially stacked metal and non-metal layers, is thin and lightweight. It is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly 30. Furthermore, the heat exchange assembly 30 does not react with the internally flowing heat exchange medium, therefore eliminating the possibility of corrosion and leakage.

[0228] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0229] By setting the metal layer to one or more of aluminum foil, copper foil, and steel foil, the flexible component 31 can have a certain structural strength and can play an isolation role.

[0230] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0231] By setting the non-metallic layer to one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible component 31 can have a certain waterproof function.

[0232] As an example, one can also choose a non-metallic layer made of corrosion-resistant material with acid and alkali corrosion resistance, or add additives to the non-metallic layer to make it resistant to acid and alkali corrosion.

[0233] In some embodiments, the non-metallic layer is a hot-melt layer.

[0234] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer together through hot melting, which is simple to form and has high production efficiency.

[0235] In some embodiments, the thickness of the flexible element 31 is 0.05mm-0.3mm.

[0236] As an example, the thickness of the flexible component 31 is any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, or 0.3mm, or a value between any two of them.

[0237] In this embodiment, by setting the thickness of the flexible component 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible component 31 has a certain structural strength while making the overall thickness of the heat exchange component 30 small, which is beneficial to reduce the overall volume and weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0238] In some embodiments, the thickness of the flexible element 31 is 0.08 mm to 0.2 mm.

[0239] As an example, the thickness of the flexible component 31 is a point value of any one of 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.2mm, or a point value between any two of them.

[0240] In this embodiment, by setting the thickness of the flexible component 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible component 31 has a certain structural strength, while further reducing the overall thickness of the heat exchange component 30. This is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0241] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0242] As an example, the elastic modulus of the flexible component 31 can be any one of 0.1MPa, 1MPa, 50MPa, 100MPa, 150MPa, 200MPa, 300MPa, 500MPa, 800MPa, 1000MPa, 1300MPa, 1500MPa, 1800MPa, 2000MPa, 2500MPa, 2800MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, 6500MPa, 7000MPa, 7500MPa, 8000MPa, 8500MPa, 8800MPa, 9000MPa, 9500MPa, 9700MPa, and 10000MPa, or a value between any two.

[0243] The elastic modulus describes the magnitude of a unit strain caused by a unit stress when a solid is subjected to force within a certain range; it is one of the fundamental physical quantities of materials. The larger the elastic modulus, the greater the stiffness and compressive strength of the material. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0244] The elastic modulus of the flexible component 31 can be measured by at least one of the following methods: static tensile testing, dynamic testing, sound velocity method, nanoindentation method, and bending method. The measuring instrument can include a nanoindenter and a universal testing machine.

[0245] For example, the elastic modulus of the flexible part 31 can be measured by nanoindentation under normal temperature and pressure. Nanoindentation uses a tiny indenter to indent the surface of the flexible part 31, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0246] In this embodiment, by setting the elastic modulus of the flexible component 31 to 0.1MPa-10000MPa, the flexible component 31 is made to have a certain structural strength, which improves the reliability of the heat exchange assembly 30, and also has a certain deformation capability. This can improve the fit between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0247] In some embodiments, the elongation at break of the flexible member 31 is greater than that of the rigid member 32. Elongation at break is a percentage of the elongation at break relative to the original length. It measures the deformation capacity of a material during tension; that is, elongation at break represents the ductility of a material under tension.

[0248] The elongation at break of the flexible component 31 is greater than that of the rigid component 32. In other words, when subjected to tensile stress, the elongation of the flexible component 31 is greater than that of the rigid component 32.

[0249] In some embodiments, the elongation at break of the flexible member 31 is in the range of 30% to 300%.

[0250] The elongation at break of the flexible component 31 can be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300%, or any value between two of them.

[0251] In this embodiment, by setting the elongation at break of the flexible component 31 to be in the range of 30% to 300%, the flexible component 31 can have a certain impact resistance and puncture resistance, as well as a certain structural strength.

[0252] In some embodiments, the elongation at break of the rigid member 32 is in the range of 1% to 50%.

[0253] The elongation at break of the rigid component 32 can be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, or 50%, or any value between two of them.

[0254] In this embodiment, by setting the elongation at break of the rigid member 32 to be in the range of 1% to 50%, the rigid member 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0255] In some embodiments, the rigid member 32 is a metal plate.

[0256] As an example, rigid member 32 can be an aluminum alloy plate with an insulating outer surface.

[0257] In this embodiment, the rigid member 32 is set as a metal plate, which has both good structural strength and good thermal conductivity.

[0258] In some embodiments, the medium flow channel 30a includes a plurality of sub-flow channels, each battery cell 10 corresponds to a plurality of sub-flow channels, and the extension direction of the sub-flow channel corresponding to the battery cell 10 is perpendicular to the length direction of the battery cell 10.

[0259] Multiple sub-channels are connected to form a medium channel 30a.

[0260] The extension direction of the sub-channel is perpendicular to the length direction of the battery cell 10. In other words, multiple sub-channels are arranged along the length direction of the battery cell 10, so that the length direction of the battery cell 10 corresponds to multiple sub-channels.

[0261] It can be understood that the temperature of the heat exchange medium will gradually increase along the flow direction of the heat exchange medium. Therefore, by corresponding each battery cell 10 with multiple sub-channels, it is beneficial to improve the temperature uniformity of the battery cell 10.

[0262] Reference Figures 2-6 The battery device 100 includes a housing 20, a heat exchange assembly 30, and multiple battery cells 10. The multiple battery cells 10 are disposed within the housing 20.

[0263] The heat exchange assembly 30 includes at least two heat exchange elements, at least one of which is a flexible element 31 and at least one of which is a rigid element 32. The elastic modulus of at least a portion of the flexible element 31 is less than that of the rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. The at least one medium flow channel 30a is used to conduct heat exchange medium for exchanging heat with the plurality of battery cells 10.

[0264] The heat exchange assembly 30 is arranged in contact with the terminal side of the battery cell 10, wherein the rigid member 32 is arranged on the side facing the battery cell 10.

[0265] In the orthographic projection along the distribution direction of the heat exchange assembly 30 and the battery cell 10, the projection of the heat exchange assembly 30 and the projection of the electrode post 11 of the battery cell 10 are offset from each other.

[0266] Specifically, the battery cell 10 includes two spaced-apart terminals 11. The terminal side of the battery cell 10 includes a central region and two shoulder regions. The central region is the area between the two terminals 11, and the shoulder regions are the areas on the sides of the two terminals 11 facing away from each other. The heat exchange assembly 30 covers at least a portion of the central region, and / or, the heat exchange assembly 30 covers at least a portion of the shoulder regions.

[0267] The heat exchange assembly 30 also includes a heat insulation layer 34 connected to the heat exchange elements, with each heat exchange element located on the side of the heat insulation layer 34 facing the battery cell 10. The heat insulation layer 34 is a flexible structure, and a heat insulation cavity 34a is formed between the heat insulation layer 34 and the adjacent heat exchange elements, and the heat insulation cavity 34a is filled with a heat insulation medium.

[0268] The insulation layer 34 has a connecting part that is connected to the heat exchanger. The heat exchange assembly 30 includes a heat insulation body 35 that is disposed between the connecting part and the heat exchanger.

[0269] Embodiments of this application also provide an electrical device that includes a battery device 100 as described in any of the above embodiments.

[0270] The electrical device of this application embodiment has all the advantages of the battery device 100 described in any of the above embodiments, and will not be repeated here.

[0271] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0272] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, The battery device includes: Box; Multiple battery cells are disposed inside the housing; A heat exchange assembly includes at least two heat exchange elements, at least one of which is a flexible element and at least one of which is a rigid element. The flexible element and the rigid element are stacked to form at least one medium flow channel. The at least one medium flow channel is used to conduct heat exchange medium, which is used to exchange heat with the plurality of battery cells. The heat exchange assembly is in contact with the electrode side of the battery cells.

2. The battery device according to claim 1, characterized in that, In the orthographic projection along the distribution direction of the heat exchange component and the battery cell, the projection of the heat exchange component and the projection of the electrode of the battery cell are offset from each other.

3. The battery device according to claim 1 or 2, characterized in that, The battery cell includes two terminals spaced apart. Each terminal side of the battery cell includes a central region and two shoulder regions. The central region is the area between the two terminals, and the shoulder regions are the areas on the sides of the two terminals facing away from each other. The heat exchange assembly covers at least a portion of the central region, and / or the heat exchange assembly covers at least a portion of the shoulder region.

4. The battery device according to any one of claims 1 to 3, characterized in that, The rigid member is disposed on the side facing the battery cell.

5. The battery device according to any one of claims 1 to 4, characterized in that, The heat exchange assembly also includes: A heat insulation layer is connected to the heat exchanger, and each heat exchanger is located on the side of the heat insulation layer facing the battery cell.

6. The battery device according to claim 5, characterized in that, Along the distribution direction of the heat exchange components and the battery cells, a heat insulation cavity is formed between the heat insulation layer and the adjacent heat exchange components.

7. The battery device according to claim 6, characterized in that, The insulation cavity is filled with an insulation medium.

8. The battery device according to any one of claims 6 to 7, characterized in that, The insulation layer has a connecting portion connected to the heat exchange component. The heat exchange component includes a heat insulation body disposed between the connecting portion and the heat exchange component.

9. The battery device according to any one of claims 5 to 8, characterized in that, The insulation layer is configured as a flexible structure.

10. The battery device according to any one of claims 1-9, characterized in that, Along the distribution direction of the heat exchange component and the battery cell, at least one side surface of the heat exchange component has a capillary structure.

11. The battery device according to claim 10, characterized in that, The capillary structure is connected to the surface of the heat exchange component, or the surface of the heat exchange component is surface-treated to form the capillary structure.

12. The battery device according to claim 10 or 11, characterized in that, The heat exchange assembly includes a connecting plate and a flow channel plate. The flow channel plate has a protrusion and a flow channel portion. The protrusion protrudes toward the connecting plate to connect with the connecting plate. The flow channel portion is spaced apart from the connecting plate to form the medium flow channel. One of the flexible member and the rigid member is the connecting plate, and the other of the flexible member and the rigid member is the flow channel plate. The surface of the flow channel plate facing away from the connecting plate has the capillary structure.

13. The battery device according to claim 12, characterized in that, The heat exchange assembly includes a condensate collector, and the space on the side of the protrusion away from the connecting plate forms a recessed space, with the condensate collector located in at least a portion of the recessed space.

14. The battery device according to claim 13, characterized in that, The flow channel plate is positioned toward the battery cell, and the condensate collector is spaced apart from the battery cell.

15. The battery device according to claim 13 or 14, characterized in that, The condensate collector does not protrude from the recessed space.

16. The battery device according to any one of claims 13-15, characterized in that, The capillary structure has a first pore, and the condensate collector has a second pore, the diameter of the second pore being smaller than the diameter of the first pore.

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

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

19. The battery device according to any one of claims 1 to 18, characterized in that, The flexible component has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

20. The battery device according to claim 19, characterized in that, The metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

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

22. The battery device according to any one of claims 1 to 21, characterized in that, The thickness of the flexible component is 0.05mm-0.3mm.

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

24. The battery device according to any one of claims 1 to 23, characterized in that, The elastic modulus of the flexible component is 0.1 MPa-10000 MPa.

25. The battery device according to any one of claims 1 to 24, characterized in that, The rigid component is a metal plate.

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

Images