Heat exchange assembly, battery device and power utilization device

Abstract

The embodiment of the invention provides a heat exchange assembly, a battery device and an electric device. The battery device comprises a box body assembly, a heat exchange assembly and a plurality of single batteries, and the battery monomers are arranged in the box body assembly. The heat exchange assembly comprises at least two heat exchange pieces, at least one heat exchange piece is arranged to be a flexible piece, and at least one heat exchange piece is arranged to be a rigid piece. The flexible part and the rigid part are stacked to form at least one medium flow channel, the at least one medium flow channel is used for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with the plurality of single batteries. The heat conductivity coefficient of one of the flexible member and the rigid member relatively close to the battery cell is greater than the heat conductivity coefficient of the other of the flexible member and the rigid member relatively far away from the battery cell, and the flexible member comprises a metal plasticized film. According to the battery device provided by the embodiment of the invention, the heat conductivity coefficient of one of the flexible part and the rigid part of the heat exchange assembly, which is relatively close to the battery monomer, is greater than that of the other one of the flexible part and the rigid part which is relatively far away from the battery monomer, so that the heat exchange efficiency is favorably improved.

Description

Technical Field

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

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to improve the heat exchange efficiency of the battery cells of the battery device has become an important research direction in this field. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a heat exchange component, a battery device, and an electrical device, which can improve the heat exchange efficiency of the heat exchange component to a certain extent.

[0004] To this end, a first aspect of an embodiment of the present application provides a battery device, including: A box assembly, wherein the box assembly has a receiving cavity; A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodation cavity; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange members, at least one of which is configured as a flexible member, and at least one of which is configured as a rigid member, wherein the flexible member and the rigid member are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; Among them, the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is greater than the thermal conductivity of the other member that is relatively far from the battery cell, and the flexible member includes a metal plastic film.

[0005] The battery device provided in the embodiment of the present application includes a box assembly, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the box assembly, and the box assembly protects the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is configured to include a flexible part and a rigid part, and the thermal conductivity of one of the flexible part and the rigid part that is relatively close to the battery cell is larger than the thermal conductivity of the other part that is relatively far from the battery cell. In this way, on the one hand, it is beneficial to improve the heat exchange efficiency by improving the heat exchange medium through the heat exchange part that is relatively close to the battery cell and the heat exchange with the battery cell. On the other hand, it can reduce the heat of the heat exchange medium from diffusing to the outside through the heat exchange part that is relatively far from the battery cell, thereby improving the thermal insulation performance of the heat exchange assembly, which is beneficial to further improve the heat exchange efficiency. In addition, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device; in addition, the flexible part has a certain flexibility, which can make the heat exchange component fit better with the box component and / or the battery cell, so as to absorb the assembly tolerance of the heat exchange component, without the need to use caulking agent or heat conductive material, improve the fit between the heat exchange component and the box component and / or the battery cell, increase the effective heat exchange area between the heat exchange component and the box component and / or the battery cell, thereby improving the heat exchange effect of the heat exchange component. Furthermore, by setting a rigid part, the heat exchange component has sufficient structural strength for carrying the battery cell, which improves the applicability of the heat exchange component. In addition, by setting the flexible part to include a metal plastic film, since the metal plastic film is thin and light, and by forming a medium flow channel between the metal plastic film and the heat exchange part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, since the heat exchange component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0006] In some embodiments, the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is in a range of 0.2 W / m·K to 800 W / m·K.

[0007] In this embodiment, by setting the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell to be in the range of 0.2 W / m·K to 800 W / m·K, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell through the heat exchange member, thereby improving the heat exchange efficiency.

[0008] In some embodiments, the thermal conductivity of one of the flexible member and the rigid member that is relatively far from the battery cell is in a range of 0.01 W / m·K to 400 W / m·K.

[0009] In this embodiment, by setting the thermal conductivity of one of the flexible part and the rigid part that is relatively far away from the battery cell to be in the range of 0.01 W / m·K to 400 W / m·K, it is beneficial to improve the diffusion of heat of the heat exchange medium through the heat exchange component, improve the thermal insulation performance of the heat exchange component, and help further improve the heat exchange efficiency.

[0010] In some embodiments, the heat exchange assembly includes a first heat exchange assembly, and the first heat exchange assembly is disposed on the bottom side of the battery cell.

[0011] The first heat exchange assembly is arranged at the bottom side of the battery cell, which means that the first heat exchange assembly is arranged below the battery cell along the height direction of the box assembly.

[0012] In some embodiments, the first heat exchange component is disposed in the accommodating cavity, and the rigid component of the first heat exchange component is closer to the battery cell than the flexible component of the first heat exchange component.

[0013] In this embodiment, by setting the rigid part of the first heat exchange assembly to be closer to the battery cell than the flexible part of the first heat exchange assembly, the rigid part can support the battery cell, which is beneficial to improve the situation where the flexible part is damaged due to force and improves the reliability of the heat exchange assembly.

[0014] In some embodiments, the heat exchange assembly includes a second heat exchange assembly, and the second heat exchange assembly is disposed on the top side of the battery cell.

[0015] In this embodiment, the second heat exchange assembly is disposed on the top side of the battery cell, which means that it does not need to bear the weight of the battery cell. Thus, the requirements for the structural strength of the heat exchange assembly can be relatively reduced, which is beneficial to reducing costs and improving reliability.

[0016] In some embodiments, the heat exchange assembly includes a third heat exchange assembly, and the third heat exchange assembly is disposed on at least one side of the battery cell along a first direction, and the first direction is perpendicular to a height direction of the box assembly.

[0017] In this embodiment, the third heat exchange assembly is arranged on at least one side of the battery cell along the first direction, that is, it does not need to bear the weight of the battery cell. In this way, the requirements for the structural strength of the heat exchange assembly can be relatively reduced, which is beneficial to reducing costs and improving reliability.

[0018] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0019] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0020] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0021] In this embodiment, the flexible member formed by stacking the metal layer and the non-metal layer in sequence is thin and light in weight, and by forming a medium flow channel between the flexible member and the rigid member, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0022] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0023] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible member can have a certain structural strength and can play an isolation role.

[0024] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member can have a certain waterproof effect.

[0025] In some embodiments, the non-metallic layer is a hot-melt layer.

[0026] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0027] In some embodiments, the flexible member is a layered structure, and the flexible member includes a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, and the first anti-corrosion layer is closer to the medium flow channel than the second anti-corrosion layer.

[0028] In this embodiment, by configuring the flexible member to include a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, the second anti-corrosion layer is closer to the medium flow channel than the first anti-corrosion layer, which is beneficial to improving the reliability of the heat exchange component.

[0029] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0030] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while the overall thickness of the heat exchange component is smaller, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0031] In some embodiments, the rigid member is configured as a metal plate.

[0032] In this embodiment, by setting the rigid part as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component with a certain heat exchange efficiency, the rigid part can also play a certain supporting role for the flexible part.

[0033] In some embodiments, the elastic modulus of at least a portion of the flexible member is smaller than the elastic modulus of the rigid member.

[0034] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0035] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and has a certain deformation ability, which can improve the fit between the heat exchange component and the case and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the case and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0036] A second aspect of an embodiment of the present application provides a heat exchange assembly, the heat exchange assembly comprising at least two heat exchange members, at least one of the heat exchange members is configured as a flexible member, at least one of the heat exchange members is configured as a rigid member, the flexible member and the rigid member 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, and the heat exchange medium is used to exchange heat with a battery cell; Among them, the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is greater than the thermal conductivity of the other member that is relatively far from the battery cell, and the flexible member includes a metal plastic film.

[0037] The heat exchange component provided in the embodiment of the present application is used for exchanging heat with a battery cell. The heat exchange component is configured to include a flexible part and a rigid part, and the thermal conductivity of one of the flexible part and the rigid part that is relatively close to the battery cell is larger than the thermal conductivity of the other part that is relatively far away from the battery cell. In this way, on the one hand, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell through the heat exchange component that is relatively close to the battery cell, thereby improving the heat exchange efficiency. On the other hand, it can reduce the situation in which the heat of the heat exchange medium diffuses to the outside through the heat exchange component that is relatively far away from the battery cell, thereby improving the thermal insulation performance of the heat exchange component, which is beneficial to further improve the heat exchange efficiency. In addition, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device; in addition, the flexible part has a certain flexibility, which can make the heat exchange component fit better with the box component and / or the battery cell, so as to absorb the assembly tolerance of the heat exchange component, without the need to use caulking agent or heat conductive material, improve the fit between the heat exchange component and the box component and / or the battery cell, increase the effective heat exchange area between the heat exchange component and the box component and / or the battery cell, thereby improving the heat exchange effect of the heat exchange component. Furthermore, by setting a rigid part, the heat exchange component has sufficient structural strength for carrying the battery cell, which improves the applicability of the heat exchange component. In addition, by setting the flexible part to include a metal plastic film, since the metal plastic film is thin and light, and by forming a medium flow channel between the metal plastic film and the heat exchange part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, since the heat exchange component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0038] A third aspect of the embodiments of the present application provides an electrical device, comprising the battery device or the heat exchange assembly described above.

[0039] The battery device of the electric device provided in the embodiment of the present application includes a box assembly, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the box assembly, and the box assembly protects the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is configured to include a flexible part and a rigid part, and the thermal conductivity of one of the flexible part and the rigid part that is relatively close to the battery cell is larger than the thermal conductivity of the other part that is relatively far from the battery cell. In this way, on the one hand, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell through the heat exchange part that is relatively close to the battery cell, thereby improving the heat exchange efficiency. On the other hand, it can reduce the heat of the heat exchange medium from diffusing to the outside through the heat exchange part that is relatively far from the battery cell, thereby improving the thermal insulation performance of the heat exchange assembly, which is beneficial to further improve the heat exchange efficiency. In addition, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device; in addition, the flexible part has a certain flexibility, which can make the heat exchange component fit better with the box component and / or the battery cell, so as to absorb the assembly tolerance of the heat exchange component, without the need to use caulking agent or heat conductive material, improve the fit between the heat exchange component and the box component and / or the battery cell, increase the effective heat exchange area between the heat exchange component and the box component and / or the battery cell, thereby improving the heat exchange effect of the heat exchange component. Furthermore, by setting a rigid part, the heat exchange component has sufficient structural strength for carrying the battery cell, which improves the applicability of the heat exchange component. In addition, by setting the flexible part to include a metal plastic film, since the metal plastic film is thin and light, and by forming a medium flow channel between the metal plastic film and the heat exchange part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, since the heat exchange component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present disclosure; Figure 2 A three-dimensional exploded schematic diagram of a battery device provided in some embodiments of the present disclosure; Figure 3 A three-dimensional exploded schematic diagram of a heat exchange assembly provided in the first embodiment of the present disclosure; Figure 4 A three-dimensional exploded schematic diagram of a flexible structure provided in some embodiments of the present disclosure; Figure 5 A three-dimensional exploded schematic diagram of a heat exchange assembly provided in a second embodiment of the present disclosure; Figure 6A schematic diagram of the positional relationship between a heat exchange assembly and a battery cell provided in some embodiments of the present disclosure, wherein the heat exchange assembly is located at the bottom side of the battery cell; Figure 7 A schematic diagram of the positional relationship between a heat exchange assembly and a battery cell provided in some embodiments of the present disclosure, wherein the heat exchange assembly is located on the top side of the battery cell.

[0041] Description of Reference Numerals 10. Battery cell; 20. Box assembly; 21. Box body; 211. First box part; 212. Second box part; 22. Bottom guard plate; 23. Accommodating cavity; 30. Heat exchange assembly; 31. Flexible part; 311. Hot pressing area; 312. Medium flow channel; 313. First anti-corrosion layer; 314. Isolation layer; 315. Second anti-corrosion layer; 32. Rigid part; 34. Connector; 35. First heat exchange assembly; 36. Second heat exchange assembly; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0042] If not otherwise specified, all embodiments and optional embodiments of the present disclosure may be combined with each other to form a new technical solution.

[0043] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form a new technical solution.

[0044] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0045] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited thereto.

[0047] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0048] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0049] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0050] In some embodiments, the electrode assembly is a laminate structure.

[0051] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0052] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0053] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0054] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0055] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0056] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0057] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0058] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0059] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present disclosure.

[0060] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0061] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0062] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0063] During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to improve the heat exchange efficiency of the battery cells of the battery device has become an important research direction in this field.

[0064] In view of this, in order to improve the heat exchange efficiency of the heat exchange assembly, an embodiment of the present disclosure provides a battery device, which includes a box assembly, a heat exchange assembly and a plurality of battery cells. The plurality of battery cells are arranged in the box assembly. The heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is configured as a flexible part, and at least one heat exchange part is configured as a rigid part. The flexible part and the rigid part are stacked to form at least one medium flow channel, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells. Among them, the thermal conductivity of one of the flexible part and the rigid part that is relatively close to the battery cell is greater than the thermal conductivity of the other one that is relatively far away from the battery cell, and the flexible part includes a metal plastic film.

[0065] The battery device provided in the embodiment of the present application includes a box assembly, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the box assembly, and the box assembly protects the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is configured to include a flexible part and a rigid part, and the thermal conductivity of one of the flexible part and the rigid part that is relatively close to the battery cell is larger than the thermal conductivity of the other part that is relatively far from the battery cell. In this way, on the one hand, it is beneficial to improve the heat exchange efficiency by improving the heat exchange medium through the heat exchange part that is relatively close to the battery cell and the heat exchange with the battery cell. On the other hand, it can reduce the heat of the heat exchange medium from diffusing to the outside through the heat exchange part that is relatively far from the battery cell, thereby improving the thermal insulation performance of the heat exchange assembly, which is beneficial to further improve the heat exchange efficiency. In addition, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device; in addition, the flexible part has a certain flexibility, which can make the heat exchange component fit better with the box component and / or the battery cell, so as to absorb the assembly tolerance of the heat exchange component, without the need to use caulking agent or heat conductive material, improve the fit between the heat exchange component and the box component and / or the battery cell, increase the effective heat exchange area between the heat exchange component and the box component and / or the battery cell, thereby improving the heat exchange effect of the heat exchange component. Furthermore, by setting a rigid part, the heat exchange component has sufficient structural strength for carrying the battery cell, which improves the applicability of the heat exchange component. In addition, by setting the flexible part to include a metal plastic film, since the metal plastic film is thin and light, and by forming a medium flow channel between the metal plastic film and the heat exchange part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, since the heat exchange component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0066] The technical solution described in the embodiments of the present disclosure is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present disclosure, and the battery device is used to provide electric energy.

[0067] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present disclosure do not impose any special restrictions on the above-mentioned electrical devices.

[0068] It should be noted that the technical solutions described in the embodiments of the present disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0069] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0070] See also Figure 2In order to meet different power requirements, the battery device 100 includes a plurality of battery cells 10, which refer to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a plurality of battery cells 10 that are both connected in series and in parallel. A plurality of battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the plurality of battery cells 10 is accommodated in the box assembly 20; of course, the battery device 100 can also be a plurality of battery cells 10 that are first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and are accommodated in the box assembly 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a confluence component for realizing electrical connection between the plurality of 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 thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0071] See also Figures 2 to 7 The embodiment of the present disclosure provides a battery device 100, which includes a box assembly 20, a heat exchange assembly 30 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box assembly 20. The heat exchange assembly 30 includes at least two heat exchange components, at least one heat exchange component is configured as a flexible component 31, and at least one heat exchange component is configured as a rigid component 32. The flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 312, and the at least one medium flow channel 312 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10. The thermal conductivity of one of the flexible component 31 and the rigid component 32 that is relatively close to the battery cell 10 is greater than the thermal conductivity of the other one that is relatively far away from the battery cell 10, and the flexible component 31 includes a metal plastic film.

[0072] The box assembly 20 can be a simple three-dimensional structure such as a single cuboid, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the box assembly 20 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin.

[0073] The box assembly 20 is used to encapsulate the battery cell 10 , and the box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10 .

[0074] For example, the box assembly 20 is generally a rectangular parallelepiped structure, the length direction and width direction of the box assembly 20 are parallel to the horizontal plane, and the length direction of the box assembly 20 is parallel to the longest side of the rectangular parallelepiped structure of the box assembly 20. The height direction of the box assembly 20 is perpendicular to the ground. For example, Figure 2 As shown, the length direction of the box assembly 20 is represented by X, the width direction of the box assembly 20 is represented by Y, and the height direction of the box assembly 20 is represented by Z.

[0075] See also Figures 3 to 7 The embodiment of the present disclosure provides a heat exchange assembly 30, which includes at least two heat exchange components, at least one of which is a flexible component 31, and at least one of which is a rigid component 32. The flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 312, and the at least one medium flow channel 312 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 10. The thermal conductivity of one of the flexible component 31 and the rigid component 32 that is relatively close to the battery cell 10 is greater than the thermal conductivity of the other that is relatively far away from the battery cell 10.

[0076] Here, the flexibility in the flexible part 31 refers to the material property of the structure. This type of property can be a property given to the material due to its light weight, or a property given to the material due to at least one of the material's thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the flexible part 31 can be selected to be a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible part 31. The embodiment of the present disclosure is conducive to reducing the weight of the heat exchange component 30 by configuring the heat exchange component 30 to include the flexible part 31.

[0077] Here, the rigidity in the rigid part 32 refers to the material property of the structure. This type of property can be a property given to the material due to the large mass of the material, or a property given to the material due to at least any one of the material's thickness, rigidity, strength, elastic modulus, elongation at break, etc. As an example, the material of the rigid part 32 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a material of a structure such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 32. The embodiment of the present disclosure can support the flexible part 31 by configuring the heat exchange component 30 to include the rigid part 32, which is beneficial to improving the overall structural strength and stability of the heat exchange component 30.

[0078] Exemplarily, the elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32 .

[0079] Elongation at break is the percentage of the elongation of a material when it breaks to its original length. It is used to measure the deformation capacity that a material can withstand during the stretching process, that is, the elongation at break indicates the ductility of the material when it is stretched under stress.

[0080] The elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32 . In other words, when stretched, the ductility of the flexible member 31 is greater than the ductility of the rigid member 32 .

[0081] By configuring the heat exchange component 30 to include a flexible part 31 and a rigid part 32 , and the elongation at break of the flexible part 31 is greater than the elongation at break of the rigid part 32 , it is beneficial to improve the impact resistance, buffering performance and anti-puncture capability of the heat exchange component 30 .

[0082] Exemplarily, the elastic modulus of at least a portion of the flexible member 31 is smaller than the elastic modulus of the rigid member 32 .

[0083] Here, the elastic modulus of a partial area of ​​the flexible member 31 may be smaller than the elastic modulus of the rigid member 32 , or the elastic modulus of the entire area of ​​the flexible member 31 may be smaller than the elastic modulus of the rigid member 32 .

[0084] By configuring the heat exchange component 30 to include the flexible component 31 and the rigid component 32 , the heat exchange component 30 can have a certain structural strength while having a flexible function.

[0085] The flexibility of the heat exchange assembly 30 can make the heat exchange surface of the heat exchange assembly 30 fit better with the battery cell 10 , further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30 .

[0086] The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 312, which means that the heat exchange assembly 30 forms the medium flow channel 312 between the flexible member 31 and the rigid member 32. In other words, the flexible member 31 constitutes at least part of the side wall of the medium flow channel 312, and the rigid member 32 also constitutes at least part of the side wall of the medium flow channel 312. The heat exchange medium flows in the medium flow channel 312 to achieve heat exchange with the battery cell 10.

[0087] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 10, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a cooling liquid.

[0088] It should be noted that the specific number of the medium flow channels 312 is not limited here, and can be one or more.

[0089] The heat exchange assembly 30 includes at least two heat exchange elements, that is, there are multiple heat exchange elements.

[0090] At least one heat exchange component is configured as a flexible component 31, which means that the number of the flexible components 31 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 31, the flexible components 31 may be the same or different.

[0091] At least one heat exchange component is configured as a rigid component 32, which means that the number of rigid components 32 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 32, the rigid components 32 may be the same or different.

[0092] Exemplarily, the heat exchange assembly 30 includes two heat exchange components, one of which is a flexible component 31 and the other is a rigid component 32 .

[0093] Exemplarily, the rigid member 32 is a rigid plate-like structure, which can support the flexible member 31 , thereby facilitating improving the overall structural strength and stability of the heat exchange assembly 30 .

[0094] For example, the rigid member 32 may be stamped or welded to form a specific structure as required for supporting functions.

[0095] Exemplarily, the heat exchange component 30 further includes an inlet and an outlet, both of which are in communication with the medium flow channel 312 .

[0096] Here, the inlet and outlet of the heat exchange assembly 30 are used to be connected to the pipelines of the air conditioning system of the vehicle or the electrical device or a liquid storage device such as a water tank.

[0097] For example, see Figure 3 The heat exchange component 30 further includes a connecting member 34 having an inlet and a connecting member 34 having an outlet, and the connecting member 34 is connected to the rigid member 32 .

[0098] For example, the connection member 34 is connected to the rigid member 32 by soldering.

[0099] Exemplarily, the connection member 34 is, for example, a water tap.

[0100] The principle of heat exchange of the heat exchange component 30 for the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 312 through the inlet of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell 10.

[0101] Here, the heat exchange component 30 exchanging heat with the battery cell 10 may be to dissipate heat from the battery cell 10 or to heat the battery cell 10 .

[0102] The principle of heat dissipation of the battery cell 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 312 through the inlet of the heat exchange component 30, and after the heat exchange medium absorbs the heat generated by the battery cell 10 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 10.

[0103] The principle of the heat exchange component 30 heating the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 312 through the inlet of the heat exchange component 30, and the heat exchange medium transfers heat to 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, completing the heating of the battery cell 10.

[0104] The flexible part 31 is set as a flexible structure, and the flexible part 31 has certain expandable or contractible characteristics. It can also be understood that the flexible part 31 can be an elastically deformable structure. The flexible part 31 has the ability to deform and restore deformation, so that the heat exchange component 30 can be formed into a contoured structure. The heat exchange component 30 can better adapt to the external contour shape of the battery cell 10 or other components to improve the fit between the heat exchange component 30 and the box assembly 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box assembly 20 and / or the battery cell 10, thereby improving the heat exchange efficiency.

[0105] It should be noted that the flexible part 31 can have conductive properties, which is conducive to maintaining an equipotential setting with the box assembly 20; the flexible part 31 can also have electrical insulation properties, without the need for insulation treatment, which is conducive to reducing the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0106] It should be noted that the specific location of the heat exchange assembly 30 is not limited here.

[0107] For example, in some embodiments, see Figure 2 The box assembly 20 and the heat exchange assembly 30 are arranged to form a receiving cavity 23 , and the battery cell 10 is arranged in the receiving cavity 23 .

[0108] That is, the heat exchange assembly 30 constitutes the cavity wall of the accommodating cavity 23, which is beneficial to reduce the material used for the box assembly 20, and further helps to reduce the weight of the battery device 100 and reduce the cost of the battery device 100. In addition, the heat exchange assembly 30 can also be in direct contact with the battery cell 10, further improving the heat exchange efficiency between the heat exchange assembly 30 and the battery cell 10.

[0109] Exemplarily, the heat exchange assembly 30 constitutes the bottom wall of the accommodating cavity 23 , and the battery cell 10 is supported by the heat exchange assembly 30 .

[0110] Here, the flexible member 31 may be disposed on a side of the rigid member 32 facing the battery cell 10 , or may be disposed on a side of the rigid member 32 facing away from the battery cell 10 .

[0111] Exemplarily, the rigid member 32 is connected to the box assembly 20 by welding or screwing.

[0112] In other embodiments, the heat exchange assembly 30 may be disposed inside the box assembly 20, that is, it may be in direct contact with the battery cell 10. It may also be disposed outside the box assembly 20, that is, the box assembly 20 is provided with a receiving cavity 23, and the heat exchange assembly 30 is disposed outside the receiving cavity 23, and heat is transferred through the intermediate medium, thereby realizing heat exchange between the heat exchange assembly 30 and the battery cell 10.

[0113] That is, at least a portion of the heat exchange assembly 30 is disposed outside the box assembly 20 to separate the heat exchange assembly 30 from the battery cell 10 .

[0114] The box assembly 20 is used to accommodate the battery cell 10. The box assembly 20 can be of various structures. Figure 2 The box assembly 20 includes a box body 21, and the box body 21 may include a first box body portion 211 and a second box body portion 212. The first box body portion 211 and the second box body portion 212 cover each other. The first box body portion 211, the second box body portion 212 and the heat exchange assembly 30 jointly define a storage space for accommodating the battery cell 10.

[0115] Exemplarily, the second box body portion 212 can be a frame structure with openings at both ends, the first box body portion 211 is a plate-like structure, the first box body portion 211 covers the opening at one end of the second box body portion 212, and the heat exchange component 30 is arranged at the opening at the other end of the second box body portion 212 to form a accommodating cavity 23.

[0116] The first box body 211 and the second box body 212 may also be hollow structures with one side open, and the open side of the first box body 211 covers the open side of the second box body 212 to form a box body 21 with a storage space. Of course, the first box body 211 and the second box body 212 may be in various shapes, such as a cylinder, a cuboid, etc.

[0117] In order to improve the sealing performance after the first box body 211 and the second box body 212 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 211 and the second box body 212 .

[0118] Assuming that the first box body portion 211 covers the top of the second box body portion 212 , the first box body portion 211 can also be referred to as an upper box cover, and the second box body portion 212 can also be referred to as a lower box cover.

[0119] For example, please refer to Figure 2 The battery device 100 further includes a bottom guard plate 22 , which is disposed on a side of the heat exchange assembly 30 that is away from the battery cell 10 .

[0120] Here, by setting the bottom guard plate 22 on the side of the heat exchange assembly 30 away from the battery cell 10, it can be used to protect the heat exchange assembly 30 and the box assembly 20, reduce the impact of foreign objects on the box assembly 20 during driving, and improve the reliability of the battery device 100.

[0121] In some embodiments, see Figures 5 and 6 The flexible member 31 and the rigid member 32 are hot pressed to form a hot pressing area 311 and a medium flow channel 312 , and the flexible member 31 and the rigid member 32 are connected to each other in at least a part of the hot pressing area 311 .

[0122] That is, the flexible member 31 and the rigid member 32 are connected by hot pressing, and the hot pressing area 311 and the medium flow channel 312 are formed by hot pressing. The flow channel area is used to conduct the medium flow channel 312. This molding method is simple.

[0123] Here, the flexible member 31 is sealed by a hot pressing process, and the hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0124] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 311 is formed by hot pressing. The hot pressing area 311 separates the heat exchange component 30 to form at least one medium flow channel 312. This molding method is simple.

[0125] Exemplarily, the heat-pressing area 311 includes a heat-sealing area and a non-heat-sealing area, and the non-heat-sealing area and the medium flow channel 312 are respectively located on both sides of the heat-sealing area, which is conducive to reducing the width of the heat-sealing area, improving the problem of excessive temperature caused by the heat-sealing area being too wide, affecting the heat-pressing quality and damaging the flexible member 31. In addition, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 31 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causes damage to the heat-sealing area.

[0126] In the related art, the heat exchange component is formed by welding high-strength aluminum alloy. However, since high-strength aluminum alloy (5 series, 6 series, etc.) has a high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0127] In the embodiment of the present application, the heat exchange component 30 is configured to include a flexible part 31 and a rigid part 32, and the flexible part 31 and the rigid part 32 are hot pressed to form a hot pressing area 311 and a medium flow channel 312. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 30.

[0128] Exemplarily, at least one of the flexible member 31 and the rigid member 32 includes an anti-corrosion layer.

[0129] The flexible member 31 may include the anti-corrosion layer, the rigid member 32 may include the anti-corrosion layer, or both the flexible member 31 and the rigid member 32 may include the anti-corrosion layer.

[0130] Here, by providing an anti-corrosion layer, the problem of corrosion of the heat exchange component 30 by the heat exchange medium, external corrosive substances, etc. can be improved.

[0131] Thermal conductivity is a physical quantity that measures the thermal conductivity of a material. It refers to the amount of heat transferred through an area of ​​1 square meter in 1 second under stable heat transfer conditions when the temperature difference between the two surfaces of a 1 meter thick material is 1 degree (K or ℃). The larger the thermal conductivity, the better the corresponding thermal conductivity efficiency.

[0132] By making the thermal conductivity of one of the flexible part 31 and the rigid part 32 which is relatively close to the battery cell 10 larger than the thermal conductivity of the other which is relatively far away from the battery cell 10, that is, the flexible part 31 may be closer to the battery cell 10 relative to the rigid part 32, or the rigid part 32 may be closer to the battery cell 10 relative to the flexible part 31. In other words, the thermal conductivity of the heat exchange part close to the battery cell 10 is larger than the thermal conductivity of the heat exchange part which is relatively far away from the battery cell 10. In other words, if the flexible part 31 is closer to the battery cell 10 relative to the rigid part 32, the thermal conductivity of the flexible part 31 is greater than the thermal conductivity of the rigid part 32; if the rigid part 32 is closer to the battery cell 10 relative to the flexible part 31, the thermal conductivity of the rigid part 32 is greater than the thermal conductivity of the flexible part 31.

[0133] In this way, on the one hand, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell 10 through the heat exchange component with a large thermal conductivity coefficient, thereby improving the heat exchange efficiency. On the other hand, it can improve the diffusion of the heat of the heat exchange medium through the heat exchange component with a small thermal conductivity coefficient, which is beneficial to improve the thermal insulation performance of the heat exchange component 30 and further improve the heat exchange efficiency.

[0134] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0135] The flexible member 31 is a single-layer or multi-layer film.

[0136] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0137] The battery device 100 provided in the embodiment of the present application includes a box assembly 20, a heat exchange assembly 30 and a plurality of battery cells 10, wherein the plurality of battery cells 10 are arranged in the box assembly 20, and the box assembly 20 plays a protective role on the battery cells 10. The heat exchange assembly 30 is used to exchange heat with the battery cells 10. By configuring the heat exchange assembly 30 to include a flexible member 31 and a rigid member 32, and the thermal conductivity of one of the flexible member 31 and the rigid member 32 that is relatively close to the battery cell 10 is larger than the thermal conductivity of the other that is relatively far from the battery cell 10, on the one hand, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell 10 through the heat exchange member that is relatively close to the battery cell 10, thereby improving the heat exchange efficiency. On the other hand, it can reduce the heat of the heat exchange medium from diffusing to the outside through the heat exchange member that is relatively far from the battery cell 10, thereby improving the thermal insulation performance of the heat exchange assembly 30, which is beneficial to further improve the heat exchange efficiency. In addition, the weight of the flexible member 31 is relatively light, which is conducive to reducing the weight of the heat exchange assembly 30, reducing the production cost of the heat exchange assembly 30, and reducing the weight of the battery device 100; in addition, the flexible member 31 has a certain flexibility, which can make the heat exchange assembly 30 fit better with the box assembly 20 and / or the battery cell 10, so as to absorb the assembly tolerance of the heat exchange assembly 30, and there is no need to use a caulking agent or a heat conductive material, thereby improving the fit between the heat exchange assembly 30 and the box assembly 20 and / or the battery cell 10, and increasing the effective heat exchange area between the heat exchange assembly 30 and the box assembly 20 and / or the battery cell 10, thereby improving the heat exchange effect of the heat exchange assembly 30. Furthermore, by setting the rigid member 32, the heat exchange assembly 30 has sufficient structural strength for carrying the battery cell 10, thereby improving the applicability of the heat exchange assembly 30. In addition, by setting the flexible member 31 to include a metal plastic film, since the metal plastic film is thin and light, and by forming a medium flow channel 312 between the metal plastic film and the heat exchange member, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced. At the same time, since the heat exchange component 30 has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component 30 reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0138] In some embodiments, see Figures 4 to 7 The thermal conductivity of the one of the flexible member 31 and the rigid member 32 that is relatively close to the battery cell 10 is in the range of 0.2 W / m·K to 800 W / m·K.

[0139] That is to say, the thermal conductivity of the one of the flexible part 31 and the rigid part 32 that is relatively close to the battery cell 10 can be any one of 0.2 W / m·K, 1 W / m·K, 10 W / m·K, 20 W / m·K, 50 W / m·K, 100 W / m·K, 150 W / m·K, 200 W / m·K, 260 W / m·K, 300 W / m·K, 340 W / m·K, 400 W / m·K, 480 W / m·K, 500 W / m·K, 570 W / m·K, 600 W / m·K, 600 W / m·K, 800 W / m·K or any point value between any two of them.

[0140] In this embodiment, by setting the thermal conductivity of the one of the flexible member 31 and the rigid member 32 that is relatively close to the battery cell 10 to be in the range of 0.2 W / m·K to 800 W / m·K, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell 10 through the heat exchange member, thereby improving the heat exchange efficiency.

[0141] In some embodiments, see Figures 4 to 7 The thermal conductivity of the one of the flexible member 31 and the rigid member 32 that is relatively far from the battery cell 10 is in the range of 0.01 W / m·K to 400 W / m·K.

[0142] The thermal conductivity of the one of the flexible member 31 and the rigid member 32 that is relatively far away from the battery cell 10 may be any one of 0.01 W / m·K, 0.02 W / m·K, 0.05 W / m·K, 0.08 W / m·K, 0.1 W / m·K, 0.12 W / m·K, 0.15 W / m·K, 0.18 W / m·K, 0.2 W / m·K, 1 W / m·K, 10 W / m·K, 20 W / m·K, 50 W / m·K, 88 W / m·K, 100 W / m·K, 180 W / m·K, 200 W / m·K, 230 W / m·K, 300 W / m·K, 360 W / m·K, and 400 W / m·K, or any point value between any two of them.

[0143] In this embodiment, by setting the thermal conductivity of the one of the flexible member 31 and the rigid member 32 that is relatively far away from the battery cell 10 to be in the range of 0.01 W / m·K to 400 W / m·K, it is beneficial to improve the diffusion of heat of the heat exchange medium through the heat exchange member, thereby improving the thermal insulation performance of the heat exchange component 30, and helping to further improve the heat exchange efficiency.

[0144] It should be noted that the specific location of the heat exchange assembly 30 is not limited here.

[0145] In some embodiments, see Figure 2 and Figure 6The heat exchange assembly 30 includes a first heat exchange assembly 35 , and the first heat exchange assembly 35 is disposed on the bottom side of the battery cell 10 .

[0146] Here, the specific structure of the first heat exchange component 35 is similar to the specific structure of the heat exchange component 30 described above, both of which include a rigid part 32 and a flexible part 31. Only for the convenience of distinguishing the different setting positions, the heat exchange component 30 arranged on the bottom side of the battery cell 10 is defined as the first heat exchange component 35.

[0147] The first heat exchange assembly 35 is disposed at the bottom side of the battery cell 10 , which means that the first heat exchange assembly 35 is disposed below the battery cell 10 along the height direction of the box assembly 20 .

[0148] The first heat exchange component 35 may be disposed inside the box component 20 , or outside the box component 20 , or may define a receiving chamber 23 together with the box component 20 .

[0149] Exemplarily, the first heat exchange assembly 35 is disposed on the bottom side of the battery cell 10 , that is, it can be used to bear at least part of the weight of the battery cell 10 .

[0150] In some embodiments, see Figure 2 and Figure 6 The first heat exchange component 35 is disposed in the accommodating cavity 23 , and the rigid component 32 of the first heat exchange component 35 is closer to the battery cell 10 than the flexible component 31 of the first heat exchange component 35 .

[0151] That is to say, the thermal conductivity of the rigid part 32 of the first heat exchange component 35 is greater than the thermal conductivity of the flexible part 31 of the first heat exchange component 35 .

[0152] Exemplarily, the thermal conductivity of the rigid part 32 of the first heat exchange component 35 is in the range of 0.2 W / m·K to 800 W / m·K, and the thermal conductivity of the flexible part 31 of the first heat exchange component 35 is in the range of 0.01 W / m·K to 400 W / m·K.

[0153] The first heat exchange component 35 is arranged in the accommodating cavity 23 and is located on the bottom side of the battery cell 10. In this way, the first heat exchange component 35 can be used to bear at least part of the weight of the battery cell 10. That is to say, the first heat exchange component 35 needs to have certain mechanical properties, that is, a certain structural strength. Therefore, the rigid part 32 of the first heat exchange component 35 can be arranged closer to the battery cell 10 than the flexible part 31 of the first heat exchange component 35, so as to support the battery cell 10 through the rigid part 32.

[0154] Exemplarily, the rigid member 32 is connected to the battery cell 10 via structural adhesive.

[0155] Exemplarily, the structural adhesive has good thermal conductivity, for example, is a thermally conductive adhesive.

[0156] Here, in the first heat exchange component 35 placed on the bottom side of the battery cell 10, the heat exchange component in contact with the battery cell 10 is a rigid component 32 with greater strength and hardness, and the heat exchange component farther away from the battery cell 10 than the rigid component 32 is a flexible component 31 with smaller strength and hardness. The flexible component 31 can be deformed by force and can return to its original state after the force is released, or the medium flow channel 312 is deformed when not working. After the heat exchange component 30 works normally, under the action of the heat exchange medium, the medium flow channel 312 returns to its original state, and the heat generated by the battery cell 10 is transferred to the rigid component 32 through the thermal conductive glue, or the heat generated by the battery cell 10 is directly transferred to the rigid component 32, and heat exchange is carried out with the heat exchange medium through the rigid component 32.

[0157] In this embodiment, by setting the rigid part 32 of the first heat exchange component 35 to be closer to the battery cell 10 than the flexible part 31 of the first heat exchange component 35, the rigid part 32 can support the battery cell 10, which is beneficial to improve the situation where the flexible part 31 is damaged due to force, thereby improving the reliability of the heat exchange component 30.

[0158] In some embodiments, see Figure 7 The heat exchange assembly 30 includes a second heat exchange assembly 36 , and the second heat exchange assembly 36 is disposed on the top side of the battery cell 10 .

[0159] Here, the specific structure of the second heat exchange assembly 36 is similar to the specific structure of the heat exchange assembly 30 and the first heat exchange assembly 35 described above, and both include a rigid part 32 and a flexible part 31. Only for the convenience of distinguishing the different setting positions, the heat exchange assembly 30 set on the top side of the battery cell 10 is defined as the second heat exchange assembly 36. For example, the second heat exchange assembly 36 and the first heat exchange assembly 35 both include a rigid part 32 and a flexible part 31, and the relative positions of the rigid part 32 and the flexible part 31 relative to the battery cell 10 can be the same or different.

[0160] The second heat exchange assembly 36 is disposed on the top side of the battery cell 10 , which means that the second heat exchange assembly 36 is disposed above the battery cell 10 along the height direction of the box assembly 20 .

[0161] The second heat exchange component 36 may be disposed inside the box component 20 , or outside the box component 20 , or may be jointly defined with the box component 20 to form a receiving chamber 23 .

[0162] In this embodiment, the second heat exchange assembly 36 is disposed on the top side of the battery cell 10, which does not need to bear the weight of the battery cell 10. Thus, the requirements for the structural strength of the heat exchange assembly 30 can be relatively reduced, which is beneficial to reducing costs and improving reliability.

[0163] In some embodiments, see Figure 7 , the rigid component 32 of the second heat exchange component 36 is closer to the battery cell 10 than the flexible component 31 of the second heat exchange component 36 .

[0164] In some other embodiments, the flexible member 31 of the second heat exchange assembly 36 is closer to the battery cell 10 than the rigid member 32 of the second heat exchange assembly 36 .

[0165] In some embodiments, the heat exchange assembly 30 includes a third heat exchange assembly, which is disposed on at least one side of the battery cell 10 along a first direction that is perpendicular to the height direction of the box assembly 20 .

[0166] Exemplarily, the third heat exchange assembly is disposed on the side surfaces of the battery cell 10 except the top side and the bottom side.

[0167] Here, the specific structure of the third heat exchange assembly is similar to the specific structure of the heat exchange assembly 30, the first heat exchange assembly 35 and the second heat exchange assembly 36 described above, and all of them include a rigid part 32 and a flexible part 31. It is only for the convenience of distinguishing the different setting positions that the heat exchange assembly 30 set on the side of the battery cell 10 is defined as the third heat exchange assembly. For example, the third heat exchange assembly and the first heat exchange assembly 35 and the second heat exchange assembly 36 all include a rigid part 32 and a flexible part 31, and the relative positions of the rigid part 32 and the flexible part 31 relative to the battery cell 10 can be the same or different.

[0168] Here, the first direction may not specifically refer to a fixed direction, for example, it may be any direction perpendicular to the height direction of the box assembly 20 .

[0169] The third heat exchange component may be disposed inside the box component 20 , or outside the box component 20 , or may be jointly defined with the box component 20 to form a receiving chamber 23 .

[0170] In this embodiment, the third heat exchange assembly is arranged on at least one side of the battery cell 10 along the first direction, that is, it does not need to bear the weight of the battery cell 10. In this way, the requirements for the structural strength of the heat exchange assembly 30 can be relatively reduced, which is beneficial to reducing costs and improving reliability.

[0171] In some embodiments, the rigid member 32 of the third heat exchange assembly is closer to the battery cell 10 than the flexible member 31 of the third heat exchange assembly.

[0172] In some other embodiments, the flexible member 31 of the third heat exchange assembly is closer to the battery cell 10 than the rigid member 32 of the third heat exchange assembly.

[0173] In some embodiments, the elongation at break of the flexible member 31 is in the range of 30% to 300%.

[0174] The elongation at break of the flexible member 31 may be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any value therebetween.

[0175] In this embodiment, by setting the elongation at break of the flexible member 31 to be in the range of 30% to 300%, the flexible member 31 can have certain impact resistance and puncture resistance as well as certain structural strength.

[0176] In some embodiments, the elongation at break of the rigid member 32 is in a range of 1% to 50%.

[0177] The elongation at break of the rigid member 32 may be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or any value therebetween.

[0178] 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, thereby facilitating improving the overall structural strength of the heat exchange assembly 30 .

[0179] In some embodiments, see Figures 4 to 5 The anti-corrosion layer includes a first anti-corrosion layer 313 , and the first anti-corrosion layer 313 is provided in at least the region where the medium flow channel 312 is formed on the rigid member 32 .

[0180] That is to say, at least the area of ​​the rigid part 32 that contacts the heat exchange medium is provided with a first anti-corrosion layer 313, and the first anti-corrosion layer 313 serves to separate the heat exchange medium and the rigid part 32, thereby improving the situation where the heat exchange medium damages the rigid part 32, that is, reducing the corrosion and leakage of the heat exchange medium.

[0181] Here, the first anti-corrosion layer 313 is, for example, a heat exchange medium resistant layer. For example, in an embodiment where the heat exchange medium is water, the first anti-corrosion layer 313 may be a waterproof layer.

[0182] In this embodiment, by providing a first anti-corrosion layer 313 in the area of ​​the rigid part 32 where at least the medium flow channel 312 is formed, the first anti-corrosion layer 313 can improve the situation where the heat exchange medium damages the rigid part 32, which is beneficial to improving the reliability of the heat exchange component 30.

[0183] Here, the rigid part 32 may be provided with the first anti-corrosion layer 313 only in the area where the medium flow channel 312 is formed. The rigid part 32 may also be covered with the first anti-corrosion layer 313 on the side facing the flexible part 31, so that the problem of the heat exchange medium damaging the rigid part 32 can be further improved, and the reliability of the heat exchange assembly 30 can be further improved.

[0184] In some embodiments, the first anti-corrosion layer 313 is configured as an aluminum-plastic film.

[0185] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0186] Exemplarily, the first anti-corrosion layer 313 includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0187] Here, polypropylene (PP), polyphenylene sulfide (PPS), polyphthalamide (PPA) or polyethylene (PE) has good corrosion resistance, which is beneficial to reduce the possibility of corrosion leakage of heat exchange medium.

[0188] Exemplarily, the first anti-corrosion layer 313 is a layered structure, and at least a layer of the first anti-corrosion layer 313 close to the medium flow channel 312 includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0189] Exemplarily, the first anti-corrosion layer 313 is an anti-corrosion coating, and the anti-corrosion coating includes one or both of epoxy resin and polyester resin.

[0190] In some embodiments, the first anti-corrosion layer 313 is formed on the rigid component 32 by hot pressing.

[0191] This manufacturing method is simple, low-cost, and helps to improve the connection reliability between the first anti-corrosion layer 313 and the rigid component 32.

[0192] Exemplarily, the flexible member 31 is provided with a first anti-corrosion layer 313 .

[0193] Here, the flexible member 31 may be provided with the first anti-corrosion layer 313 at least in the region where the medium flow channel 312 is formed, and the flexible member 31 may also be covered with the first anti-corrosion layer 313 on the side facing the rigid member 32 .

[0194] In some embodiments, see Figure 4 , the anti-corrosion layer includes a second anti-corrosion layer 315 .

[0195] Here, the second anti-corrosion layer 315 is disposed on the outside of the heat exchange component 30 to reduce the corrosion of the heat exchange component 30 by external corrosive substances.

[0196] Exemplarily, the second anti-corrosion layer 315 has good acid and alkali corrosion resistance.

[0197] Exemplarily, a second anti-corrosion layer 315 is provided on a side of the rigid component 32 facing away from the flexible component 31 .

[0198] That is to say, a second anti-corrosion layer 315 is provided on the side of the rigid part 32 facing away from the medium flow channel 312 , i.e., on the outer side of the rigid part 32 . The second anti-corrosion layer 315 can reduce the corrosion of the rigid part 32 by external corrosive substances, thereby improving the reliability of the heat exchange component 30 .

[0199] Exemplarily, a second anti-corrosion layer 315 is provided on a side of the flexible member 31 facing away from the rigid member 32 .

[0200] That is to say, a second anti-corrosion layer 315 is provided on the side of the flexible member 31 facing away from the medium flow channel 312 , i.e., on the outside of the flexible member 31 . The second anti-corrosion layer 315 can reduce the corrosion of the flexible member 31 by external corrosive substances, thereby improving the reliability of the heat exchange assembly 30 .

[0201] In some embodiments, the side of the heat exchange component 30 is provided with a second anti-corrosion layer 315. That is, the second anti-corrosion layer 315 covers the side of the heat exchange component 30.

[0202] In this way, on the one hand, the second anti-corrosion layer 315 can reduce the corrosion of the sides of the flexible part 31 and the rigid part 32 by external corrosive substances. On the other hand, it can also reduce the penetration of external corrosive substances into the gap between the flexible part 31 and the rigid part 32 from the connection between the flexible part 31 and the rigid part 32, thereby further improving the reliability of the heat exchange assembly 30.

[0203] In some embodiments, one of the flexible member 31 and the rigid member 32 forms a flange portion, and the flange portion at least covers a side edge of the other one.

[0204] Exemplarily, the flexible member 31 forms a flange portion, and the flange portion at least covers the side edge of the rigid member 32 .

[0205] The flange portion at least covers the side of the rigid component 32 , which means that the flange portion may only cover the side of the rigid component 32 , or may cover part of the side wall of the rigid component 32 facing away from the flexible component 31 .

[0206] Exemplarily, the rigid member 32 forms a flange portion, and the flange portion at least covers the side edge of the flexible member 31 .

[0207] The flange portion at least covers the side of the flexible member 31 , which means that the flange portion may only cover the side of the flexible member 31 , or may cover part of the side wall of the flexible member 31 facing away from the rigid member 32 .

[0208] In this embodiment, by forming a flange portion and covering at least the side of the other one of them with the flange portion, it is further helpful to reduce the penetration of external corrosive substances from the connection between the flexible part 31 and the rigid part 32 into the gap between the flexible part 31 and the rigid part 32, thereby further improving the reliability of the heat exchange component 30.

[0209] In some embodiments, the second anti-corrosion layer 315 includes nylon.

[0210] Here, the second anti-corrosion layer 315 may be a nylon layer formed of nylon material, so that it has certain corrosion resistance, for example, resistance to acid and alkali corrosion.

[0211] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0212] The flexible member 31 is a single-layer or multi-layer film.

[0213] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0214] In this embodiment, since the metal plastic film is thin and light in weight, and the medium flow channel 312 is formed between the metal plastic film and the heat exchanger, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the thickness and weight of the heat exchange component 30 can be reduced. At the same time, since the heat exchange component 30 has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat exchange component 30 reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0215] Exemplarily, the flexible member 31 comprises an aluminum-plastic film.

[0216] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0217] In some embodiments, see Figure 4 The flexible member 31 is a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0218] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite material member composed of a metal layer and a non-metal layer.

[0219] Exemplarily, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0220] Here, the number of metal layers and non-metal layers is not limited.

[0221] In this embodiment, the flexible member 31, which is formed by stacking metal layers and non-metal layers in sequence, is thin and light in weight, and by forming a medium flow channel 312 between the flexible member 31 and the rigid member 32, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced. In addition, the heat exchange component 30 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0222] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, which are stacked in sequence, wherein the non-metal layer is arranged on the side of the metal layer facing the rigid member 32 .

[0223] That is, the non-metal layer is located between the metal layer and the rigid member 32 .

[0224] Here, by arranging the non-metal layer on the side of the metal layer facing the rigid part 32 , the non-metal layer can be connected to the rigid part 32 through hot pressing.

[0225] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0226] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0227] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0228] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0229] Exemplarily, a non-metallic layer of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, an additive may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0230] In some embodiments, the non-metallic layer is a hot melt layer.

[0231] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0232] In some embodiments, see Figure 3 to Figure 4The flexible member 31 is a layered structure. The flexible member 31 includes a first anti-corrosion layer 313 , an isolation layer 314 , and a second anti-corrosion layer 315 arranged in sequence. The first anti-corrosion layer 313 is closer to the medium flow channel 312 than the second anti-corrosion layer 315 .

[0233] Here, the second anti-corrosion layer 315 may be a nylon layer formed of nylon material, so that it has certain corrosion resistance, for example, resistance to acid and alkali corrosion.

[0234] The isolation layer 314 may be a metal layer, and the metal layer may be configured as one or more of aluminum foil, copper foil and steel foil, so that the flexible member 31 may have a certain structural strength and may play an isolation role.

[0235] The first anti-corrosion layer 313 may be a non-metallic layer, and the non-metallic layer may be configured to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, so as to enable the flexible member 31 to have a certain waterproof effect.

[0236] In this embodiment, by configuring the flexible member 31 to include a first anti-corrosion layer 313, an isolation layer 314, and a second anti-corrosion layer 315 arranged in sequence, the second anti-corrosion layer 315 is closer to the medium flow channel 312 than the first anti-corrosion layer 313, which helps to improve the reliability of the heat exchange component 30.

[0237] In some embodiments, the isolation layer 314 has a thickness of 6.5 μm-100 μm.

[0238] The thickness of the isolation layer 314 can be any one of 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm or any value between two of them.

[0239] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5 μm-100 μm, the flexible member 31 can have a certain structural strength and flexibility.

[0240] In some embodiments, the isolation layer 314 has a thickness of 6.5 μm-15 μm.

[0241] The thickness of the isolation layer 314 can be any one of 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm or any value between any two of them.

[0242] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5 μm-15 μm, the flexible member 31 can further have a certain structural strength and flexibility.

[0243] In some embodiments, the second anti-corrosion layer 315 has a thickness of 5 μm-20 μm.

[0244] The thickness of the second anti-corrosion layer 315 can be 5 μm, 5.5 μm, 5.8 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 7.8 μm, 8 μm, 8.3 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.7 μm, 10 μm, 10.3 μm, 10.5 μm, 10.8 μm, 11 μm, 11.5 μm, 1 Any one of the point values ​​of 1.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 18.7μm, 19μm, 19.5μm, 20μm or any point value between any two of them.

[0245] In this embodiment, by setting the thickness of the second anti-corrosion layer 315 to 5 μm-20 μm, the wear resistance and toughness of the flexible member 31 can be improved.

[0246] In some embodiments, the thickness of the first anti-corrosion layer 313 is 50 μm-120 μm.

[0247] The thickness of the first anti-corrosion layer 313 can be any one of 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, 120μm or any value between two of them.

[0248] In this embodiment, by setting the thickness of the first anti-corrosion layer 313 to 50 μm-120 μm, the first anti-corrosion layer 313 can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible member 31 through the first anti-corrosion layer 313 .

[0249] In some embodiments, the thickness of the flexible member 31 is 0.05 mm-0.3 mm.

[0250] For example, it is any point value 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, and 0.3mm, or a point value between any two of them.

[0251] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 is smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0252] In some embodiments, the thickness of the flexible member 31 is 0.08 mm-0.2 mm.

[0253] For example, it is any one of 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, and 0.2mm, or a point value between any two of them.

[0254] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 is further made smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0255] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0256] Exemplarily, the elastic modulus of the flexible member 31 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0257] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to force within a certain range. It is one of the basic physical quantities of a material. The larger the elastic modulus, the greater the stiffness of the material and the greater its compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0258] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box component 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0259] It should be noted that the specific material of the rigid component 32 is not limited here.

[0260] In some embodiments, the rigid member 32 is configured as a metal plate.

[0261] By way of example, it may be an aluminum alloy.

[0262] In this embodiment, by setting the rigid part 32 as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component 30 with a certain heat exchange efficiency, the rigid part 32 can also play a certain supporting role for the flexible part 31.

[0263] The elastic modulus of the flexible member 31 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0264] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by a nanoindentation method, which uses a tiny indenter to indent the surface of the flexible member 31 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0265] For example, the elongation at break of the flexible member 31 and the rigid member 32 may be measured by a tensile test or a drop weight test at room temperature and pressure. The measuring instrument may include a universal testing machine.

[0266] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms are not necessarily directed 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. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are contradictory.

[0267] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box assembly, wherein the box assembly has a receiving cavity; A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodation cavity; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange members, at least one of which is configured as a flexible member, and at least one of which is configured as a rigid member, wherein the flexible member and the rigid member are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; Among them, the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is greater than the thermal conductivity of the other member that is relatively far from the battery cell, and the flexible member includes a metal plastic film.

2. The battery device according to claim 1, characterized in that: The thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is in the range of 0.2 W / m·K to 800 W / m·K; and / or, The thermal conductivity of one of the flexible member and the rigid member that is relatively far from the battery cell is in a range of 0.01 W / m·K to 400 W / m·K.

3. The battery device according to claim 1, characterized in that: The heat exchange assembly includes a first heat exchange assembly, and the first heat exchange assembly is arranged on the bottom side of the battery cell.

4. The battery device according to claim 3, characterized in that: The first heat exchange component is disposed in the accommodating cavity, and the rigid component of the first heat exchange component is closer to the battery cell than the flexible component of the first heat exchange component.

5. The battery device according to claim 1, characterized in that: The heat exchange assembly includes a second heat exchange assembly, and the second heat exchange assembly is arranged on the top side of the battery cell.

6. The battery device according to claim 1, characterized in that: The heat exchange assembly includes a third heat exchange assembly, and the third heat exchange assembly is arranged on at least one side of the battery cell along a first direction, and the first direction is perpendicular to the height direction of the box assembly.

7. The battery device according to claim 1, characterized in that: The flexible member comprises an aluminum-plastic film.

8. The battery device according to claim 1, characterized in that: The flexible member is a layered structure, and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

9. The battery device according to claim 8, characterized in that: The metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

10. The battery device according to claim 8, characterized in that: The non-metallic layer is a hot-melt layer.

11. The battery device according to claim 1, characterized in that: The flexible member is a layered structure, and includes a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer which are arranged in sequence. The first anti-corrosion layer is closer to the medium flow channel than the second anti-corrosion layer.

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

13. The battery device according to any one of claims 1 to 12, characterized in that: The rigid member is configured as a metal plate.

14. The battery device according to any one of claims 1 to 12, characterized in that: The elastic modulus of at least a portion of the flexible member is smaller than the elastic modulus of the rigid member.

15. The battery device according to any one of claims 1 to 12, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

16. A heat exchange component, characterized in that: The heat exchange assembly comprises at least two heat exchange members, at least one of which is a flexible member, and at least one of which is a rigid member, wherein the flexible member and the rigid member are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a battery cell; Among them, the thermal conductivity of one of the flexible member and the rigid member that is relatively close to the battery cell is greater than the thermal conductivity of the other member that is relatively far from the battery cell, and the flexible member includes a metal plastic film.

17. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 15 or the heat exchange component according to claim 16.

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