Heat exchange assembly, battery device and electric equipment

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device and electric equipment. The battery device comprises a box body assembly, a battery monomer assembly and a heat exchange assembly, and the battery monomer assembly is arranged in the box body assembly. And the heat exchange assembly is used for exchanging heat with the battery monomer assembly. The heat exchange assembly comprises an inlet part, an outlet part and at least two flexible pieces. At least one medium flow channel is formed between the at least two flexible parts, and an inlet of the inlet part and an outlet of the outlet part are both communicated with the medium flow channel. The controller is configured to control the battery device to switch between a first state and a second state. And in the first state, the medium flow channel is filled with a heat exchange medium, and the heat exchange assembly is used for cooling the battery monomer assembly. And in the second state, the medium flow channel is not filled with the heat exchange medium. According to the control method of the battery device provided by the embodiment of the invention, the heating efficiency, the heat preservation effect and the like of the battery device can be 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] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] In new energy vehicles equipped with battery systems, these systems can provide full or partial power. During use, the battery cells within the system generate heat. Excessive heat generation can adversely affect the performance and lifespan of the battery. Therefore, effectively dissipating heat from the battery cells has become an important research topic in this field. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a heat exchange component, a battery device and an electrical equipment, which can improve the heat exchange effect to a certain extent.

[0005] To achieve the above objectives, a first aspect of an embodiment of the present application provides a battery device, comprising:

[0006] Cabinet assembly;

[0007] A battery cell assembly is disposed in the box assembly;

[0008] a heat exchange assembly for exchanging heat with the battery cell assembly; wherein the heat exchange assembly comprises an inlet portion, an outlet portion, and at least two flexible members, at least one medium flow channel is formed between the at least two flexible members, and the inlet of the inlet portion and the outlet of the outlet portion are both in communication with the medium flow channel;

[0009] A controller configured to control the battery device to switch between a first state and a second state, wherein in the first state, the medium flow channel is filled with a heat exchange medium and the heat exchange assembly is used to cool the battery cell assembly; in the second state, the medium flow channel is not filled with a heat exchange medium.

[0010] The battery device provided in the embodiment of the present application includes a case assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the case assembly, and the case assembly protects the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. The battery device includes a first state and a second state. In the first state, that is, in the cooling state, a heat exchange medium is filled in the medium flow channel of the heat exchange assembly to cool the battery cell assembly. In the second state, that is, in the non-cooling state, by discharging the heat exchange medium in the medium flow channel and closing the outlet and the inlet, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device; it can also improve the heating efficiency and thermal insulation effect of the battery device.

[0011] In some embodiments, in the second state, the medium flow channel is filled with a heat-insulating medium, and the thermal conductivity of the heat-insulating medium is lower than the thermal conductivity of the heat exchange medium.

[0012] The thermal conductivity of the heat-insulating medium is lower than that of the heat-exchange medium. Thus, in the second state, the heating device can heat the battery device quickly, thereby improving the heating efficiency of the battery device.

[0013] In addition, if the battery cell assembly is in a low-temperature static state, if the medium flow channel is filled with an insulating medium, it will help to improve the heat loss of the battery device through the heat exchange component to a certain extent, thereby improving the insulation effect of the battery device.

[0014] In some embodiments, the thermal insulation medium is air.

[0015] In the second state, the heat exchange medium in the medium flow channel can be discharged and filled with air to achieve heat insulation for the battery device and achieve a heat preservation effect.

[0016] In some embodiments, the heat exchange component further includes a first switch valve, a second switch valve and a three-way valve, wherein the first switch valve is arranged at the outlet portion for selectively opening or closing the outlet, and the second switch valve is arranged at the inlet portion for selectively opening or closing the inlet, and the three-way valve includes a first branch, a second branch and a third branch, wherein the first branch is connected to the inlet, the second branch is connected to the heat exchange medium source, and the third branch is connected to the insulation medium source.

[0017] In this embodiment, the first switch valve, the second switch valve and the three-way valve cooperate to discharge the heat exchange medium and / or the heat insulation medium, or fill the heat exchange medium and / or the heat insulation medium.

[0018] In some embodiments, the heat exchange assembly further includes a storage element, wherein the storage element is used to store the heat exchange medium discharged from the medium flow channel.

[0019] Here, the specific type of the storage element is not limited. The storage element is a container with a certain volume, which is used to store the heat exchange medium discharged from the medium flow channel.

[0020] In some embodiments, the heat exchange component is disposed outside the first accommodating cavity.

[0021] In this embodiment, a heat exchange assembly is provided on the outside of the first accommodating cavity to separate the heat exchange assembly from the battery cell assembly, thereby preventing the heat exchange medium of the heat exchange assembly from leaking and contacting the battery cell assembly, thereby preventing the battery device from short-circuiting. This improves the safety performance and reliability of the battery device.

[0022] In some embodiments, the box assembly includes a box body and a bottom guard plate, the box body includes a first box body part and a second box body part, a first accommodating cavity is formed between the first box body part and the second box body part, a second accommodating cavity is formed between the bottom guard plate and the second box body part, and the heat exchange assembly is arranged in the second accommodating cavity.

[0023] In this embodiment, a bottom guard plate is provided on the outside of the box body to define a second accommodating chamber between the bottom guard plate and the second box body portion. The heat exchange assembly is disposed within the second accommodating chamber for heat exchange with the box body, thereby achieving heat exchange for the battery cell assembly carried within the box body. In other words, by arranging the heat exchange assembly outside the first accommodating chamber of the box assembly, the problem of short circuiting the battery device due to leakage of the heat exchange medium from the heat exchange assembly can be avoided to a certain extent, thereby improving the safety and reliability of the battery device, and the utilization rate of the accommodating chamber within the box assembly can be increased, thereby improving the compactness of the battery device. Furthermore, by providing the bottom guard plate, the bottom guard plate cooperates with the box body to connect and protect the battery cell assembly, further improving the reliability of the box assembly.

[0024] In some embodiments, the at least two flexible members are configured as metal plasticized films.

[0025] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel formed between at least two metal-plasticized films, are unaffected by the extrusion process and eliminate the need for strict thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly's insulating properties prevent the risk of insulation failure. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0026] In some embodiments, the at least two flexible members are configured as aluminum-plastic films.

[0027] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0028] In some embodiments, the at least two flexible members include a hot pressing region, wherein the hot pressing region is configured such that the at least two flexible members are formed by hot pressing, and the hot pressing region separates the heat exchange component to form the at least one medium flow channel.

[0029] The flexible part is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the heat exchange component to form at least one medium flow channel. This molding method is simple.

[0030] 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.

[0031] In this embodiment, the flexible member, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel between at least two flexible members, it is unaffected by the extrusion process and eliminates the need for strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0032] In some embodiments, the metal layer includes one of aluminum foil, copper foil and steel foil.

[0033] The flexible part can have a certain structural strength and can play an isolation role.

[0034] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0035] The flexible part can be made waterproof to a certain extent.

[0036] In some embodiments, the non-metallic layer is a hot-melt layer.

[0037] 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 and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0038] In some embodiments, the flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

[0039] In this embodiment, by configuring the flexible member to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange component.

[0040] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0041] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-100 μm, the flexible member can have a certain structural strength and flexibility.

[0042] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0043] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-15 μm, the flexible member can further have a certain structural strength and flexibility.

[0044] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm-20 μm.

[0045] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5 μm-20 μm, the wear resistance and toughness of the flexible component can be improved.

[0046] In some embodiments, the waterproof layer has a thickness of 50 μm-120 μm.

[0047] In this embodiment, by setting the thickness of the waterproof layer to 50 μm-120 μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible parts through the waterproof layer.

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

[0049] 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 to increase the energy density of the battery.

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

[0051] By setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength, while the overall thickness of the heat exchange component is further reduced, which is conducive to further reducing the overall volume and weight of the battery, thereby further increasing the energy density of the battery.

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

[0053] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and also have a certain deformation ability, which can improve the fit between the heat exchange component and the box component and / or the battery component battery cell component, thereby increasing the effective heat exchange area between the heat exchange component and the box component and / or the battery component battery cell component, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0054] A second aspect of an embodiment of the present application provides a heat exchange assembly, which is the heat exchange assembly of the battery device described above, and is used to exchange heat with the battery cell assembly.

[0055] The heat exchange assembly provided in the embodiments of the present application is used to exchange heat with a battery cell assembly. The battery device includes a first state and a second state. In the first state, i.e., in the cooling state, a heat exchange medium is filled in the medium flow channel of the heat exchange assembly to cool the battery cell assembly. In the second state, i.e., in the non-cooling state, the heat exchange medium in the medium flow channel is discharged and the outlet and inlet are closed. In this way, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device; it can also improve the heating efficiency and thermal insulation effect of the battery device.

[0056] A third aspect of an embodiment of the present application provides an electrical device, comprising the battery device described above, wherein the battery device is used to provide electrical energy.

[0057] The battery device of the electrical equipment provided in the embodiment of the present application includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. The battery device includes a first state and a second state. In the first state, that is, in the cooling state, a heat exchange medium is filled in the medium flow channel of the heat exchange assembly to cool the battery cell assembly. In the second state, that is, in the non-cooling state, by discharging the heat exchange medium in the medium flow channel and closing the outlet and the inlet, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device; it can also improve the heating efficiency and thermal insulation effect of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0059] Figure 2 This is a schematic exploded perspective view of a battery device according to an embodiment of the present application, wherein the heat exchange assembly is disposed in the second accommodation chamber;

[0060] Figure 3 A cross-sectional view of a battery device provided in one embodiment of the present application;

[0061] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0062] Figure 5 A schematic diagram of the connection structure between the heat exchange assembly and the bottom guard plate provided in one embodiment of the present application;

[0063] Figure 6 A schematic structural diagram of a heat exchange assembly provided in one embodiment of the present application;

[0064] Figure 7 A schematic structural diagram of a bottom guard plate provided in one embodiment of the present application;

[0065] Figure 8 This is a schematic exploded perspective view of a battery device according to an embodiment of the present application, wherein the heat exchange assembly is disposed in the first accommodation chamber;

[0066] Figure 9 for Figure 8 The structural schematic diagram of the heat exchange component shown;

[0067] Figure 10 This is a flow chart of a control method for a battery device provided in an embodiment of the present application.

[0068] Description of Reference Numerals

[0069] 10. Battery cell assembly; 11. Battery device cell; 20. Box assembly; 21. Box body; 211. First box body portion; 212. Second box body portion; 22. Bottom guard plate; 221. Connecting portion; 222. Support structure; 23. First accommodating cavity; 24. Second accommodating cavity; 30. Heat exchange assembly; 31. Flexible part; 32. Medium flow channel; 33. Avoidance hole; 34. Hot pressing area; 35. Inlet portion; 36. Outlet portion; 37. First switch valve; 38. Three-way valve; 381. First branch; 382. Second branch; 383. Third branch; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0070] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0071] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0072] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0073] In the embodiment of the present application, 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.

[0074] The battery cells can 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., which are not limited in the embodiments of the present application.

[0075] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0076] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0077] 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.

[0078] In some embodiments, the electrode assembly is a laminate structure.

[0079] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0080] 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.

[0081] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0082] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0083] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0084] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0085] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0086] In some embodiments, the battery cell may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0087] 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, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0088] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0089] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0090] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0091] Power plants are increasingly demanding higher area energy density for energy storage containers. Consequently, to increase the amount of electricity they can hold, the weight of the containers is also increasing. However, containers must be transported from production sites to their intended destinations by land and / or sea, and these transport methods often have weight restrictions. This creates a conflict between the increased energy density and the weight of the energy storage containers.

[0092] During the use of the battery device, the battery cells in the battery device will generate heat. If this heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate heat from the battery cells of the battery device has become an important research direction in this field. In the related art, a cooling system is provided in the battery device box to cool the battery cells in the battery device. The above-mentioned cooling system may include multiple aluminum water-cooling plates laid in the battery device box, and the surfaces of the multiple water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned multiple water-cooling plates, thereby removing heat from the battery cells and cooling the battery cells. However, when the aluminum water-cooling plates in the above-mentioned cooling system do not fit well with the surfaces of the battery cells in the battery device, the heat exchange efficiency and heat exchange effect are poor. At the same time, when assembling with the battery cell assembly, assembly tolerance compensation and filling of caulking agent are required, and the production cost is high. In addition, the water-cooling plate and battery device box have high rigidity and require the use of hard structural adhesive, which makes disassembly difficult. If self-adhesive, soft or double-sided adhesive is used, the rigidity of the water-cooling plate and battery device box is relatively good, and when there is a gap and flatness mismatch, there will be problems with debonding.

[0093] In view of this, in order to improve the heat exchange efficiency and heat exchange effect of the battery device, an embodiment of the present application provides a battery device, which includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the box assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. The heat exchange assembly includes an inlet portion, an outlet portion and at least two flexible parts. At least one medium flow channel is formed between the at least two flexible parts, and the inlet of the inlet portion and the outlet of the outlet portion are both connected to the medium flow channel. The controller is configured to control the battery device to switch between a first state and a second state. In the first state, the medium flow channel is filled with a heat exchange medium, and the heat exchange assembly is used to cool the battery cell assembly. In the second state, the medium flow channel is not filled with a heat exchange medium.

[0094] The battery device provided in the embodiment of the present application includes a case assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the case assembly, and the case assembly protects the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. The battery device includes a first state and a second state. In the first state, that is, in the cooling state, a heat exchange medium is filled in the medium flow channel of the heat exchange assembly to cool the battery cell assembly. In the second state, that is, in the non-cooling state, by discharging the heat exchange medium in the medium flow channel and closing the outlet and the inlet, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device; it can also improve the heating efficiency and thermal insulation effect of the battery device.

[0095] The technical solutions described in the embodiments of this application are applicable to electrical equipment using a battery device. The electrical equipment includes a battery device according to any embodiment of this application, and the battery device is used to provide electrical energy.

[0096] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0097] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including box assemblies and electrical equipment using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0098] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be provided 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 provided 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 application, 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.

[0099] To meet different power requirements, the battery device 100 includes a battery cell assembly 10, which may include multiple battery cell 11. A battery cell 11 is the smallest unit that makes up a battery module or battery pack. Multiple battery cell 11 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that multiple battery cell 11 are connected in both series and parallel. Multiple battery cell 11 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cell 11 is accommodated in the box assembly 20. Of course, the battery device 100 can also be a battery module formed by first connecting multiple battery cell 11 in series, in parallel, or in a mixed connection, and then the multiple battery module is connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box assembly 20. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for achieving electrical connection between the multiple battery cell 11. Each battery cell 11 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 11 can be cylindrical, flat, rectangular, or in other shapes.

[0100] The battery device provided in an embodiment of the present application, the battery device 100 includes a box assembly 20, a battery cell assembly 10 and a heat exchange assembly 30. The battery cell assembly 10 is arranged in the box assembly 20. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10. Among them, the heat exchange assembly 30 includes an inlet portion 35, an outlet portion 36 and at least two flexible parts. At least one medium flow channel 32 is formed between the at least two flexible parts, and the inlet of the inlet portion 35 and the outlet of the outlet portion 36 are both connected to the medium flow channel 32. The controller is configured to control the battery device 100 to switch between a first state and a second state. In the first state, the medium flow channel 32 is filled with a heat exchange medium, and the heat exchange assembly 30 is used to cool the battery cell assembly 10. In the second state, the medium flow channel 32 is not filled with a heat exchange medium.

[0101] Please refer to Figure 2 and Figure 8 The battery device 100 includes a box assembly 20 and a battery cell assembly 10 . The battery cell assembly 10 includes at least one battery cell 11 . The battery cell 11 is disposed in a first accommodation cavity 23 of the box assembly 20 .

[0102] The housing assembly 20 can be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing assembly 20 can be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0103] The box assembly 20 is used to encapsulate the battery cell assembly 10 . The box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell assembly 10 .

[0104] The present application embodiment provides a heat exchange component, please refer to Figures 2 to 9 The heat exchange component 30 is the heat exchange component 30 of the battery device 100 provided in an embodiment of the present application. The heat exchange component 30 is used to exchange heat with the battery cell component 10 .

[0105] Here, the box assembly 20 has a first accommodating cavity 23, and the heat exchange assembly 30 can be arranged in the first accommodating cavity 23, that is, it can be in direct contact with the battery cell assembly 10, or it can be arranged outside the first accommodating cavity 23, and heat is transferred through the intermediate medium, thereby realizing heat exchange between the heat exchange assembly 30 and the battery cell assembly 10.

[0106] The heat exchange assembly 30 includes at least two flexible parts 31, which are stacked and at least one medium flow channel 32 is formed between the flexible parts 31. The at least one medium flow channel 32 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0107] That the heat exchange assembly 30 includes at least two flexible members 31 means that the number of the flexible members 31 included in the heat exchange assembly 30 may be two or more than two.

[0108] Here, the flexibility of the flexible member 31 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its light weight, or a property imparted to the material due to at least one of its thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible member 31 can be selected to be a material that is lighter than conventional structures such as aluminum plates or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of the flexible member 31. By configuring the heat exchange assembly 30 in the form of the flexible member 31, the embodiment of the present disclosure facilitates reducing the weight of the heat exchange assembly 30.

[0109] At least one medium flow channel 32 is formed between at least two flexible members 31 , which means that the heat exchange assembly 30 forms a medium flow channel 32 between adjacent flexible members 31 . The heat exchange medium flows through the medium flow channel 32 to achieve heat exchange with the battery cell assembly 10 .

[0110] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can cool the battery unit 11. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a cooling liquid.

[0111] In the first state, the medium flow channel 32 is filled with heat exchange medium, and the heat exchange assembly 30 is used to cool the battery cell assembly 10 . That is, the battery device 100 is in a cooling state at this time.

[0112] In the second state, the heat exchange medium in the medium flow channel 32 is discharged so that the medium flow channel 32 is not filled with heat exchange medium. In this way, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device 100, causing insulation failure or even short circuit and fire of the battery device 100.

[0113] Here, the second state may refer to a state other than the cooling state of the battery cell assembly 10 .

[0114] Exemplarily, the second state includes a heating state in which the battery cell assembly 10 is heated.

[0115] It is understood that when the battery cell assembly 10 is heated, if the medium flow channel 32 is filled with heat exchange medium, some of the heat from the battery device 100 will be removed by the heat exchange medium during heating, resulting in low heating efficiency. However, by draining the heat exchange medium from the medium flow channel 32, the heating device can quickly heat the battery device 100 after the heat exchange medium is drained, reducing heat absorption by the heat exchange medium and thus improving the heating efficiency of the battery device 100.

[0116] Here, the heating device is, for example, a heating film.

[0117] Illustratively, the second state includes the battery cell assembly 10 being in a stationary state.

[0118] It is understood that when the battery cell assembly 10 is in a static state, that is, when the battery cell assembly 10 does not need to be cooled or dissipated, if the medium flow channel 32 is filled with heat exchange medium, micro-leakage may occur. The leaked heat exchange medium slowly seeps into the battery device 100, and may even cause insulation failure or even a short circuit and fire in the battery device 100. By draining the heat exchange medium from the medium flow channel 32 so that the medium flow channel 32 is not filled with heat exchange medium, the leakage of heat exchange medium can be improved, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device 100, causing insulation failure or even a short circuit and fire in the battery device 100.

[0119] Furthermore, if the battery cell assembly 10 is in a low-temperature static state and the medium flow channel 32 is filled with a heat exchange medium, a large amount of heat from the bottom of the battery assembly 100 will be dissipated through the heat exchange medium, resulting in poor thermal insulation. However, by draining the heat exchange medium from the medium flow channel 32, the medium flow channel 32 is free of heat exchange medium, thereby improving the thermal insulation performance of the battery assembly 100.

[0120] For example, please refer to Figure 5 and Figure 6 The heat exchange assembly 30 further includes an inlet portion 35 and an outlet portion 36 , and the inlet of the inlet portion 35 and the outlet of the outlet portion 36 are both in communication with the medium flow channel 32 .

[0121] Here, the inlet portion 35 and the outlet portion 36 of the heat exchange assembly 30 are used to connect to pipelines of a liquid storage device such as an air conditioning system or a water tank of the entire vehicle.

[0122] The heat exchange assembly 30 is formed with at least two medium flow channels 32 , which means that the number of the medium flow channels 32 is two or more.

[0123] The principle of heat dissipation of the battery cell assembly 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel through the inlet of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell assembly 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell assembly 10.

[0124] The flexible part 31 is set as a flexible structure. 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 or other components to improve the fit between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby improving the heat exchange efficiency.

[0125] In addition, the flexible member 31 with a flexible structure is more conducive to discharging the heat exchange medium in the medium flow channel 32 .

[0126] It should be noted that the flexible member 31 can have conductive properties, which is beneficial for equipotential setting; the flexible member 31 can also have electrical insulation properties, without the need for insulation treatment, which is beneficial for reducing the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0127] The battery device provided in the embodiment of the present application includes a box assembly 20, a battery cell assembly 10 and a heat exchange assembly 30. The battery cell assembly 10 is arranged in the first accommodating cavity 23 of the box assembly 20, and the box assembly 20 protects the battery cell assembly 10. The heat exchange component 30 is used to exchange heat with the battery cell assembly 10. On the one hand, the heat exchange component 30 is made of a flexible part 31, and the flexible part 31 is relatively light, which is beneficial to reducing the mass of the battery device 100, reducing the production cost of the heat exchange component 30, and improving the energy density of the battery device 100; on the other hand, by setting the flexible part 31 as a flexible structure, the heat exchange component 30 can be better fitted with the box assembly 20 and / or the battery cell assembly 10, which is beneficial to absorbing the assembly tolerance of the heat exchange component 30, without the need for filler or thermal conductive material, thereby improving the fit between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, and increasing the effective heat exchange area between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0128] Furthermore, the battery device 100 has a first state and a second state. In the first state, i.e., the cooling state, the medium flow channel 32 of the heat exchange assembly 30 is filled with a heat exchange medium to cool the battery cell assembly 10. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel 32 is discharged to eliminate the heat exchange medium, and the outlet 36 and inlet 35 are closed. This can reduce the leakage of the heat exchange medium, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device 100 and causing insulation failure or even a short circuit and fire in the battery device 100. It can also improve the heating efficiency and thermal insulation effect of the battery device 100.

[0129] Here, the heat exchange assembly 30 can be disposed in the first accommodating cavity 23 , that is, the heat exchange assembly 30 can be in direct contact with the battery cell assembly 10 , thereby further improving the heat exchange efficiency between the heat exchange assembly 30 and the battery cell assembly 10 .

[0130] Of course, in other implementations, please refer to Figure 2 A heat exchange component 30 may be provided on the outside of the first accommodating chamber 23 .

[0131] That is, at least a portion of the heat exchange assembly 30 is disposed outside the first accommodating cavity 23 , so as to separate the heat exchange assembly 30 from the battery cell assembly 10 .

[0132] In the related art, the heat exchange assembly and the battery cell assembly are arranged in the same space. When the heat exchange medium in the above cooling system is prone to leakage, the risk of short circuit of the battery cell assembly in the battery device box is increased, affecting the reliability of the battery device.

[0133] In this embodiment, a heat exchange assembly 30 is provided on the outside of the first accommodating cavity 23 to separate the heat exchange assembly 30 from the battery cell assembly 10, thereby reducing the risk of the heat exchange medium of the heat exchange assembly 30 leaking and contacting the battery cell assembly 10, thereby reducing the risk of short circuit of the battery device 100 and improving the reliability of the battery device 100.

[0134] The box assembly 20 is used to accommodate the battery cell assembly 10. The box assembly 20 can be of various structures. In some embodiments, please refer to Figure 2 and Figure 8 The housing assembly 20 includes a housing body 21. The housing body 21 may include a first housing portion 211 and a second housing portion 212. The first housing portion 211 and the second housing portion 212 cover each other and together define a first accommodating cavity 23 for accommodating the battery cell assembly 10. The second housing portion 212 may be a hollow structure with one end open. The first housing portion 211 is a plate-like structure. The first housing portion 211 covers the open side of the second housing portion 212 to form the housing body 21 having the first accommodating cavity 23. The first housing portion 211 and the second housing portion 212 may also each be a hollow structure with one end open. The open side of the first housing portion 211 covers the open side of the second housing portion 212 to form the housing body 21 having the first accommodating cavity 23. Of course, the first housing portion 211 and the second housing portion 212 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0135] 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 .

[0136] Assuming that the first box portion 211 covers the top of the second box portion 212 , the first box portion 211 can also be referred to as an upper box cover, and the second box portion 212 can also be referred to as a lower box cover.

[0137] In other embodiments, the box assembly 20 includes a box body 21 and a bottom guard plate 22. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the outer side wall of the box body 21. A heat exchange assembly 30 is disposed in the second accommodating cavity 24.

[0138] It should be noted that the bottom guard plate 22 can be arranged at the bottom of the box body 21. In this case, the bottom guard plate 22 is, for example, the bottom guard plate 22. The bottom guard plate 22 can also be arranged at the top of the box body 21 or at the side of the box body 21.

[0139] For example, see Figure 2 The box assembly 20 includes a box body 21 and a bottom guard plate 22. The box body 21 includes a first box body portion 211 and a second box body portion 212. A first accommodating cavity 23 is formed between the first box body portion 211 and the second box body portion 212. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box body portion 212. A heat exchange assembly 30 is arranged in the second accommodating cavity 24.

[0140] Here, the heat exchange component 30 is arranged in the second accommodating chamber 24, which means that the heat exchange component 30 can be arranged only in the second accommodating chamber 24, or the heat exchange component 30 can be arranged in other areas except the second accommodating chamber 24 in addition to being arranged in the second accommodating chamber 24.

[0141] A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box portion 212 , that is, the first accommodating cavity 23 and the second accommodating cavity 24 are separated.

[0142] Here, by providing the bottom guard plate 22 , the heat exchange assembly 30 can be supported and protected.

[0143] The heat exchange assembly 30 is arranged in the second accommodating cavity 24, that is, the heat exchange assembly 30 is arranged outside the first accommodating cavity 23, so as to separate the heat exchange assembly 30 from the battery cell assembly 10, thereby avoiding the heat exchange medium of the heat exchange assembly 30 from leaking and contacting the battery cell assembly 10, thereby causing the battery device 100 to short-circuit, thereby improving the safety performance and reliability of the battery device 100.

[0144] In this embodiment, a bottom guard plate 22 is provided on the outside of the box body 21 to define a second accommodating chamber 24 between the bottom guard plate 22 and the second box portion 212. The heat exchange assembly 30 is disposed within the second accommodating chamber 24 for heat exchange with the box body 21, thereby achieving heat exchange with the battery cell assembly 10 carried within the box body 21. In other words, by disposing the heat exchange assembly 30 outside the first accommodating chamber 23 of the box assembly 20, the problem of short circuiting of the battery device 100 due to leakage of the heat exchange medium from the heat exchange assembly 30 can be avoided to a certain extent, thereby improving the safety and reliability of the battery device 100, and maximizing the utilization of the accommodating chamber within the box assembly 20, thereby increasing the compactness of the battery device 100. Furthermore, by providing the bottom guard plate 22, the bottom guard plate 22 cooperates with the box body 21 to connect and protect the battery cell assembly 10, further improving the reliability of the box assembly 20.

[0145] In some embodiments, see Figure 2 and Figure 7 Part of the bottom guard plate 22 protrudes to form a circle of connecting portion 221, and the connecting portion 221 is sealed and connected to the second box body portion 212.

[0146] Part of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , and the connecting portions 221 are used to connect with the second box portion 212 .

[0147] Exemplarily, the edge of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , that is, the outermost circle of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 .

[0148] The specific method of connecting the connecting portion 221 and the second box body portion 212 is not limited herein. For example, the connecting portion 221 and the second box body portion 212 are fastened together by bolts, screws, or rivets.

[0149] In this embodiment, the protruding connecting portion 221 forms a circle, which not only connects to the second housing portion 212 but also defines a second accommodating chamber 24 between the bottom guard plate 22 and the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 can, to a certain extent, prevent mud, sand, or water from entering the second accommodating chamber 24, thereby protecting the heat exchange assembly 30 within the second accommodating chamber 24.

[0150] In some embodiments, the box assembly 20 further includes a seal (not shown), which is disposed between the connecting portion 221 and the second box portion 212 .

[0151] Exemplarily, the sealing member is, for example, a sealing strip.

[0152] In this embodiment, a seal is provided and the seal is clamped between the connecting portion 221 and the second box portion 212. That is, the seal is used to seal the gap between the connecting portion 221 and the second box portion 212, which further helps to prevent mud, sand or water from entering the second accommodating cavity 24, thereby improving the sealing performance between the bottom guard plate 22 and the second box portion 212.

[0153] In some embodiments, see Figure 2 and Figure 7 Part of the bottom guard plate 22 is protruding to form a support structure 222. The support structure 222 is used to support the flexible member 31 and / or the second box portion 212.

[0154] Here, the support structure 222 is used to support the flexible member 31 and / or the second box body 212, which means that the support structure 222 is in contact with the flexible member 31 and / or the second box body 212, providing a certain supporting force to the flexible member 31 and / or the second box body 212. In other words, the support structure 222 can be used to support the flexible member 31, the second box body 212, or both the flexible member 31 and the second box body 212.

[0155] It should be noted that part of the area of the bottom guard plate 22 is protruding to form a support structure 222. This may mean that the side of the bottom guard plate 22 facing away from the box body 21 is concave, so that the side of the bottom guard plate 22 facing the box body 21 is protruding to form the support structure 222; it may also mean that the side of the bottom guard plate 22 facing away from the box body 21 is not concave, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protruded to form the support structure 222.

[0156] The support structure 222 is used to support the flexible member 31 and / or the second box portion 212 , so as to form a fixed space between the bottom guard plate 22 and the second box portion 212 , which is beneficial to improving the reliability of the battery device 100 .

[0157] In this embodiment, the bottom guard plate 22 is provided with a support structure 222 for supporting the flexible part 31 and / or the second box body part 212. This is beneficial to improving the problem of deformation of the second box body part 212 due to insufficient support strength when it is under pressure, thereby improving the problem of the second box body part 212 directly adhering to the heat exchange component 30, which causes the heat exchange component 30 to be crushed. It is beneficial to improve the stability of the thermal interface contact of the heat exchange component 30, thereby improving the thermal management performance of the heat exchange component 30.

[0158] In some embodiments, the support structure 222 abuts the flexible member 31 against the second box portion 212 to support the flexible member 31 and the second box portion 212 .

[0159] For example, in an embodiment where the support structure 222 is used to support the flexible member 31 , the support structure 222 may be supported on the surface of the flexible member 31 and cause the flexible member 31 to abut against the second box portion 212 .

[0160] In this embodiment, the flexible member 31 is abutted against the second box body portion 212 by providing a support structure 222 , which not only supports the second box body portion 212 but also fixes the heat exchange assembly 30 , thereby improving the stability of the heat exchange assembly 30 .

[0161] In some embodiments, see Figures 2 to 7 The heat exchange assembly 30 is provided with an avoidance hole 33 , and the support structure 222 passes through the avoidance hole 33 to abut against the second box portion 212 .

[0162] Here, the heat exchange component 30 is provided with an avoidance hole 33 , that is, the flexible member 31 is provided with an avoidance hole 33 , and the avoidance hole 33 passes through two opposite sides of the heat exchange component 30 in the thickness direction.

[0163] It should be noted that the avoidance hole 33 needs to avoid the medium flow channel 32 .

[0164] Here, the specific position and number of the avoidance holes 33 are not limited and are determined according to specific circumstances.

[0165] For example, in an embodiment where the support structure 222 is used to support the second box body 212 , the heat exchange assembly 30 may be provided with an avoidance hole 33 for avoiding the support structure 222 so that the support structure 222 passes through the avoidance hole 33 to abut against the second box body 212 .

[0166] In this embodiment, the heat exchange component 30 avoids the support structure 222 by setting an avoidance hole 33. The support structure 222 passes through the avoidance hole 33 to abut against the second box body 212. While supporting the second box body 212, it can also position the heat exchange component 30, thereby improving the stability of the heat exchange component 30.

[0167] In some embodiments, see Figures 2 to 6 , at least two flexible parts 31 are configured as metal plastic films.

[0168] The flexible member 31 is a single-layer or multi-layer film.

[0169] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0170] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel 32 formed between at least two metal-plasticized films, are unaffected by the extrusion process and do not require a high thickness. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the insulation properties of the heat exchange assembly 30 reduce the risk of insulation failure. This reduces the risk of reaction between the heat exchange assembly 30 and the heat exchange medium flowing within it, further minimizing the risk of corrosion and leakage of the heat exchange medium.

[0171] Exemplarily, at least two flexible members 31 are configured as aluminum-plastic films.

[0172] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0173] In some embodiments, see Figures 2 to 6 At least two flexible members 31 include a hot pressing region 34 . The hot pressing region 34 is configured such that at least two flexible members 31 are formed by hot pressing. The hot pressing region 34 separates the heat exchange assembly 30 to form at least one medium flow channel 32 .

[0174] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0175] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0176] 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, and the metal layer and the non-metal layer are stacked in sequence.

[0177] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0178] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0179] Here, the number of metal layers and non-metal layers is not limited.

[0180] In this embodiment, the flexible member 31, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel 32 between at least two flexible members 31, it is unaffected by the extrusion process and eliminates the need for a high thickness requirement. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the heat exchange assembly 30 does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0181] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil.

[0182] By setting the metal layer to be one of aluminum foil, copper foil and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0183] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0184] By setting the non-metallic layer to be one of polypropylene, polyvinyl chloride and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0185] For example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0186] In some embodiments, the non-metallic layer is a hot melt layer.

[0187] 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 and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0188] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer.

[0189] Here, the corrosion-resistant layer may be a nylon layer formed of nylon material, thereby having certain corrosion resistance, such as acid and alkali corrosion resistance.

[0190] The isolation layer may be a metal layer, and the metal layer may be configured as one of aluminum foil, copper foil and steel foil, which can provide the flexible member 31 with a certain structural strength and play an isolation role.

[0191] The waterproof layer may be a non-metallic layer, and the non-metallic layer may be configured to be one of polypropylene, polyvinyl chloride and polyethylene, so that the flexible member 31 may have a certain waterproof effect.

[0192] In this embodiment, by configuring the flexible member 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange assembly 30.

[0193] In some embodiments, see Figures 2 to 7The flexible member 31 includes a hot pressing region 34 . The hot pressing region 34 is configured by hot pressing at least two flexible members 31 . The hot pressing region 34 separates the heat exchange unit 37 to form at least one medium flow channel 32 .

[0194] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0195] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0196] In some embodiments, the isolation layer has a thickness of 6.5 μm to 100 μm.

[0197] The thickness of the isolation layer 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.

[0198] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-100 μm, the flexible member 31 can have a certain structural strength and flexibility.

[0199] In some embodiments, the isolation layer has a thickness of 6.5 μm to 15 μm.

[0200] The thickness of the isolation layer can be any one of 6.5μm, 7μm, 7.5μm, 7.8μm, 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.

[0201] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-15 μm, the flexible member 31 can be further endowed with certain structural strength and flexibility.

[0202] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm to 20 μm.

[0203] The thickness of the corrosion-resistant layer can be 5μm, 5.5μm, 5.8μm, 6μm, 6.5μm, 7μm, 7.5μm, 7.8μm, 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. Any one of the point values of 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.

[0204] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5 μm-20 μm, the wear resistance and toughness of the flexible member 31 can be improved.

[0205] In some embodiments, the waterproof layer has a thickness of 50 μm to 120 μm.

[0206] The thickness of the waterproof layer 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.

[0207] In this embodiment, by setting the thickness of the waterproof layer to 50 μm-120 μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible member 31 through the waterproof layer.

[0208] In some embodiments, the thickness of the flexible member 31 is 0.05 mm to 0.3 mm.

[0209] For example, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, 0.3mm, etc.

[0210] 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 while 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 and increasing the energy density of the battery device 100.

[0211] In some embodiments, the thickness of the flexible member 31 is 0.08 mm to 0.2 mm.

[0212] For example, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0213] 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.

[0214] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0215] Exemplarily, the elastic modulus of the flexible part 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.

[0216] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to a certain force range. It is one of the fundamental physical quantities of a material. The larger the elastic modulus, the greater the material's stiffness and compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0217] 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 component battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery component battery cell component 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0218] In some embodiments, in the second state, the medium flow channel 32 is filled with a heat-insulating medium, and the thermal conductivity of the heat-insulating medium is smaller than the thermal conductivity of the heat exchange medium.

[0219] Here, the thermal conductivity of the heat insulating medium is smaller than the thermal conductivity of the heat exchange medium. Therefore, in the second state, the heating device can heat the battery device 100 quickly, thereby improving the heating efficiency of the battery device 100 .

[0220] In addition, if the battery cell assembly 10 is in a low-temperature static state, if the medium flow channel 32 is filled with a heat-insulating medium, it is helpful to improve the heat loss of the battery device 100 through the heat exchange assembly 30 to a certain extent, thereby improving the heat preservation effect of the battery device 100.

[0221] It should be noted that the specific type of thermal insulation medium is not limited here.

[0222] Exemplarily, the thermal insulation medium is air.

[0223] That is, in the second state, the heat exchange medium in the medium flow channel 32 can be discharged and filled with air to achieve heat insulation for the battery device 100 and achieve a heat preservation effect.

[0224] The thermal insulation medium can be air or other media such as liquid with low thermal conductivity.

[0225] In some embodiments, see Figure 8 and Figure 9 The heat exchange assembly 30 further includes a first switch valve 37 . The first switch valve 37 is disposed at the outlet portion 36 and is configured to selectively open or close the outlet portion 36 .

[0226] Here, the first on-off valve 37 is, for example, an on-off valve.

[0227] In this embodiment, a first switch valve 37 is provided at the outlet portion 36 to selectively open or close the outlet portion 36. Thus, the heat exchange medium and / or heat insulation medium can be discharged or filled by controlling the first switch valve 37.

[0228] In some embodiments, see Figure 9The heat exchange assembly 30 further includes a first on-off valve 37, a second on-off valve, and a three-way valve 38. The first on-off valve 37 is disposed at the outlet 36 and is used to selectively open or close the outlet. The second on-off valve is disposed at the inlet 35 and is used to selectively open or close the inlet. The three-way valve 38 includes a first branch 381, a second branch 382, and a third branch 383. The first branch 381 is connected to the inlet 35, the second branch 382 is connected to the heat exchange medium source, and the third branch 383 is connected to the insulation medium source.

[0229] The heat exchange medium in the medium flow channel 32 can be discharged by controlling the outlet portion 36 to open, controlling the second branch 382 to close, and controlling the third branch 383 to open, and the heat insulation medium source can be controlled to fill the medium flow channel 32 with the heat insulation medium, and the outlet portion 36 can be controlled to close, and the third branch 383 can be controlled to close, so as to discharge the heat exchange medium and fill the heat insulation medium.

[0230] Of course, it is also possible to control the outlet part 36 to open, control the second branch 382 to close, control the third branch 383 to open, control the heat insulation medium source to fill the heat insulation medium into the medium flow channel 32, and discharge the heat exchange medium in the medium flow channel 32, control the outlet part 36 to close, and control the third branch 383 to close, so as to discharge the heat exchange medium and fill the heat insulation medium.

[0231] In this embodiment, the first switch valve 37 , the second switch valve and the three-way valve 38 cooperate to discharge the heat exchange medium and / or the heat insulation medium, or fill the heat exchange medium and / or the heat insulation medium.

[0232] In some embodiments, the heat exchange assembly 30 further includes a storage element for storing the heat exchange medium discharged from the medium flow channel 32 .

[0233] Here, the specific type of the storage element is not limited. The storage element is a container with a certain volume, which is used to store the heat exchange medium discharged from the medium flow channel 32 .

[0234] The present application embodiment provides a control method for a battery device. Figures 1 to 9 As shown, the battery device 100 includes a box assembly 20 , a battery cell assembly 10 and a heat exchange assembly 30 .

[0235] Figure 10 This is a flow chart of a control method for a battery device provided in an embodiment of the present application, such as Figure 10 As shown, the control method of the battery device includes the following steps S101 to S102:

[0236] Step S101 , in a first state, controlling the medium flow channel to be filled with a heat exchange medium; wherein the first state is a cooling state in which the battery cell assembly is cooled by the heat exchange assembly.

[0237] Exemplarily, the heat exchange assembly 30 includes at least two flexible parts 31, which are stacked and at least one medium flow channel 32 is formed between the flexible parts 31. The at least one medium flow channel 32 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0238] That the heat exchange assembly 30 includes at least two flexible members 31 means that the number of the flexible members 31 included in the heat exchange assembly 30 may be two or more than two.

[0239] Here, the flexible member 31 is configured as a flexible structure. In other words, the flexible member 31 is made of a material that can be squeezed and deformed, resulting in excellent stretchability, water impermeability, and break elongation. The flexible member 31 is configured as a flexible structure with certain expandable and contractible properties, thereby forming a contoured structure of the heat exchange assembly 30, improving the fit between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, and thereby increasing the effective heat exchange area between the heat exchange assembly 30, the housing assembly 20, and / or the battery cell assembly 10.

[0240] That the heat exchange assembly 30 includes at least two flexible members 31 means that the number of the flexible members 31 included in the heat exchange assembly 30 may be two or more than two.

[0241] Here, the flexible member 31 is relatively light, which helps to reduce the weight of the heat exchange assembly 30 .

[0242] At least one medium flow channel 32 is formed between at least two flexible members 31 , which means that the heat exchange assembly 30 forms the medium flow channel 32 between the flexible members 31 . The heat exchange medium flows through the medium flow channel 32 to achieve heat exchange with the battery cell assembly 10 .

[0243] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can cool the battery unit 11. For example, it can be gaseous or liquid. In the embodiment of the present application, water is used as the heat exchange medium for example.

[0244] In addition, the flexible member 31 with a flexible structure is more conducive to discharging the heat exchange medium in the medium flow channel 32 .

[0245] It should be noted that the flexible member 31 can have conductive properties, which is beneficial for equipotential setting; the flexible member 31 can also have electrical insulation properties, without the need for insulation treatment, which is beneficial for reducing the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0246] In the first state, the medium flow channel 32 is filled with heat exchange medium, and the heat exchange assembly 30 is used to cool the battery cell assembly 10 . That is, the battery device 100 is in a cooling state at this time.

[0247] In some embodiments, at least two flexible members 31 are configured as metal plasticized films.

[0248] The flexible member 31 is a single-layer or multi-layer film.

[0249] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0250] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel 32 formed between at least two metal-plasticized films, are unaffected by the extrusion process and eliminate the need for high thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the insulation properties of the heat exchange assembly 30 prevent the risk of insulation failure. The heat exchange assembly 30 also avoids any reaction with the heat exchange medium flowing within, eliminating the risk of corrosion or leakage.

[0251] Exemplarily, at least two flexible members 31 are configured as aluminum-plastic films.

[0252] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0253] In some embodiments, see Figures 2 to 6 At least two flexible members 31 include a hot pressing region 34 . The hot pressing region 34 is configured such that at least two flexible members 31 are formed by hot pressing. The hot pressing region 34 separates the heat exchange assembly 30 to form at least one medium flow channel 32 .

[0254] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0255] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0256] Step S102: In the second state, the heat exchange medium in the medium flow channel is discharged, and the outlet and the inlet are closed.

[0257] In the second state, the heat exchange medium in the medium flow channel 32 is discharged so that the medium flow channel 32 is not filled with heat exchange medium. In this way, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device 100, causing insulation failure or even short circuit and fire of the battery device 100.

[0258] Here, the second state may refer to a state other than the cooling state of the battery cell assembly 10 .

[0259] For example, see Figure 5 and Figure 6 The heat exchange assembly 30 further includes an inlet portion 35 and an outlet portion 36 , and the inlet of the inlet portion 35 and the outlet of the outlet portion 36 are both in communication with the medium flow channel 32 .

[0260] Here, the inlet portion 35 and the outlet portion 36 of the heat exchange assembly 30 are used to connect to pipelines of the entire vehicle.

[0261] The heat exchange component 30 is formed with at least one medium flow channel 32 , which means that the number of the medium flow channels 32 is one or more.

[0262] The principle of heat dissipation of the battery cell assembly 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the cold source enters the medium circulation through the inlet portion 35 of the heat exchange component 30, absorbs the heat generated during the operation of the battery cell assembly 10, and then flows out through the outlet portion 36 of the heat exchange component 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell assembly 10.

[0263] The flexible part 31 is set as a flexible structure with certain expandable or contractible properties, so that the heat exchange component 30 can be formed into a contoured structure, thereby improving the fit between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery cell component 10.

[0264] The control method of the battery device provided in the embodiment of the present application is as follows: the battery device 100 includes a box assembly 20, a battery cell assembly 10 and a heat exchange assembly 30. The battery cell assembly 10 is arranged in the first accommodating cavity 23 of the box assembly 20, and the box assembly 20 protects the battery cell assembly 10. The heat exchange component 30 is used to exchange heat with the battery cell assembly 10. On the one hand, the heat exchange component 30 is made of a flexible part 31, and the flexible part 31 is relatively light, which is beneficial to reducing the mass of the battery device 100, reducing the production cost of the heat exchange component 30, and improving the energy density of the battery device 100; on the other hand, by setting the flexible part 31 as a flexible structure, the heat exchange component 30 can be better fitted with the box assembly 20 and / or the battery cell assembly 10, which is beneficial to absorbing the assembly tolerance of the heat exchange component 30, without the need for filler or thermal conductive material, thereby improving the fit between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, and increasing the effective heat exchange area between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0265] Furthermore, the battery device 100 has a first state and a second state. In the first state, i.e., the cooling state, the medium flow channel 32 of the heat exchange assembly 30 is filled with a heat exchange medium to cool the battery cell assembly 10. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel 32 is discharged to eliminate the heat exchange medium, and the outlet 36 and inlet 35 are closed. This can reduce the leakage of the heat exchange medium, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device 100 and causing insulation failure or even a short circuit and fire in the battery device 100. It can also improve the heating efficiency and thermal insulation effect of the battery device 100.

[0266] In some embodiments, the second state includes a state other than the battery cell assembly 10 being in a cool state.

[0267] That is, the heat exchange medium in the medium flow channel 32 can be discharged in any state other than the cooling state of the battery cell assembly 10 .

[0268] In some embodiments, the second state includes a heating state in which the battery cell assembly 10 is heated.

[0269] It is understood that when the battery cell assembly 10 is heated, if the medium flow channel 32 is filled with heat exchange medium, some of the heat from the battery device 100 will be removed by the heat exchange medium during heating, resulting in low heating efficiency. However, by draining the heat exchange medium from the medium flow channel 32, the heating device can quickly heat the battery device 100 after the heat exchange medium is drained, reducing heat absorption by the heat exchange medium and thus improving the heating efficiency of the battery device 100.

[0270] Here, the heating device is, for example, a heating film.

[0271] Illustratively, the second state includes the battery cell assembly 10 being in a stationary state of the battery device 100 .

[0272] It is understood that when the battery cell assembly 10 is in a static state, that is, when the battery cell assembly 10 does not need to be cooled or dissipated, if the medium flow channel 32 is filled with heat exchange medium, micro-leakage may occur. The leaked heat exchange medium slowly seeps into the battery device 100, and may even cause insulation failure or even a short circuit and fire in the battery device 100. By draining the heat exchange medium from the medium flow channel 32 so that the medium flow channel 32 is not filled with heat exchange medium, the leakage of heat exchange medium can be improved, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device 100, causing insulation failure or even a short circuit and fire in the battery device 100.

[0273] Furthermore, if the battery cell assembly 10 is in a low-temperature static state and the medium flow channel 32 is filled with a heat exchange medium, a large amount of heat from the bottom of the battery assembly 100 will be dissipated through the heat exchange medium, resulting in poor thermal insulation. However, by draining the heat exchange medium from the medium flow channel 32, the medium flow channel 32 is free of heat exchange medium, thereby improving the thermal insulation performance of the battery assembly 100.

[0274] In some embodiments, after the heat exchange medium in the medium flow channel 32 is discharged, the control method further includes:

[0275] The medium flow channel 32 is controlled to be filled with a heat insulating medium, and the thermal conductivity of the heat insulating medium is smaller than the thermal conductivity of the heat exchange medium.

[0276] Here, the thermal conductivity of the heat insulating medium is smaller than the thermal conductivity of the heat exchange medium. Therefore, in the second state, the heating device can heat the battery device 100 quickly, thereby improving the heating efficiency of the battery device 100 .

[0277] In addition, if the battery cell assembly 10 is in a low-temperature static state, if the medium flow channel 32 is filled with a heat-insulating medium, it is helpful to improve the heat loss of the battery device 100 through the heat exchange assembly 30 to a certain extent, thereby improving the heat preservation effect of the battery device 100.

[0278] It should be noted that the specific type of thermal insulation medium is not limited here.

[0279] In some embodiments, the insulating medium is air.

[0280] That is, in the second state, the heat exchange medium in the medium flow channel 32 can be discharged and filled with air to achieve heat insulation for the battery device 100 and achieve a heat preservation effect.

[0281] In some embodiments, see Figure 8 and Figure 9 The heat exchange assembly 30 further includes a first switch valve 37, which is disposed at the outlet portion 36 and is used to selectively open or close the outlet portion 36; the step of discharging the heat exchange medium in the medium flow channel 32 includes:

[0282] Control the inlet portion 35 to be closed and the outlet portion 36 to be open;

[0283] Extracting the heat exchange medium in the medium flow channel 32;

[0284] After the heat exchange medium is exhausted, the outlet portion 36 is controlled to be closed.

[0285] Here, the first on-off valve 37 is, for example, an on-off valve.

[0286] In this embodiment, a first on-off valve 37 is provided at the outlet 36 to selectively open or close the outlet 36. Thus, the heat exchange medium in the medium flow channel 32 can be pumped out by controlling the inlet 35 to be closed and the outlet 36 to be open. After the heat exchange medium has been completely pumped out, the outlet 36 is controlled to be closed to discharge the heat exchange medium.

[0287] In some embodiments, see Figure 9 The heat exchange assembly 30 further includes a first on-off valve 37, a second on-off valve, and a three-way valve 38. The first on-off valve 37 is provided at the outlet 36 for selectively opening or closing the outlet 36. The three-way valve 38 includes a first branch 381, a second branch 382, and a third branch 383. The first branch 381 is connected to the inlet 35, the second branch 382 is connected to the heat exchange medium source, and the third branch 383 is connected to the insulation medium source. The step of discharging the heat exchange medium in the medium flow channel 32 includes:

[0288] Control the outlet portion 36 to be open, control the second branch 382 to be closed, and control the third branch 383 to be open;

[0289] Discharge the heat exchange medium in the medium flow channel 32, and control the heat insulation medium source to fill the medium flow channel 32 with the heat insulation medium;

[0290] The outlet portion 36 is controlled to be closed, and the third branch 383 is controlled to be closed.

[0291] The heat exchange medium in the medium flow channel 32 can be discharged by controlling the outlet portion 36 to open, controlling the second branch 382 to close, and controlling the third branch 383 to open, and the heat insulation medium source can be controlled to fill the medium flow channel 32 with the heat insulation medium, and the outlet portion 36 can be controlled to close, and the third branch 383 can be controlled to close, so as to discharge the heat exchange medium and fill the heat insulation medium.

[0292] Of course, it is also possible to control the outlet part 36 to open, control the second branch 382 to close, control the third branch 383 to open, control the heat insulation medium source to fill the heat insulation medium into the medium flow channel 32, and discharge the heat exchange medium in the medium flow channel 32, control the outlet part 36 to close, and control the third branch 383 to close, so as to discharge the heat exchange medium and fill the heat insulation medium.

[0293] In this embodiment, the first switch valve 37 and the three-way valve 38 cooperate to discharge the heat exchange medium and / or the heat insulation medium, or fill the heat exchange medium and / or the heat insulation medium.

[0294] In some embodiments, the heat exchange assembly 30 further includes a storage element for storing the heat exchange medium discharged from the medium flow channel 32 .

[0295] Here, the specific type of the storage element is not limited. The storage element is a container with a certain volume, which is used to store the heat exchange medium discharged from the medium flow channel 32 .

[0296] It should be noted that the thickness of the corrosion-resistant layer, the isolation layer and the waterproof layer can be measured by a vernier caliper; the thickness of the flexible part 31 can be measured by a vernier caliper before assembly. It should be noted that the above measurements can be performed at normal temperature and pressure.

[0297] 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.

[0298] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by nanoindentation. The nanoindentation method 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.

[0299] In the description of this application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in further 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 application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in this application and features of different embodiments or examples, unless they are mutually inconsistent.

[0300] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: Cabinet assembly; A battery cell assembly is disposed in the box assembly; a heat exchange assembly for exchanging heat with the battery cell assembly; wherein the heat exchange assembly comprises an inlet portion, an outlet portion, and at least two flexible members, at least one medium flow channel is formed between the at least two flexible members, and the inlet of the inlet portion and the outlet of the outlet portion are both in communication with the medium flow channel; a controller configured to control the battery device to switch between a first state and a second state, wherein in the first state, the medium flow channel is filled with a heat exchange medium, and the heat exchange assembly is used to cool the battery cell assembly; In the second state, the medium flow channel is not filled with heat exchange medium.

2. The battery device according to claim 1, wherein: In the second state, the medium flow channel is filled with a heat-insulating medium, and the thermal conductivity of the heat-insulating medium is lower than the thermal conductivity of the heat exchange medium.

3. The battery device according to claim 2, characterized in that The heat insulating medium is air.

4. The battery device according to claim 2, wherein: The heat exchange component also includes a first switch valve, a second switch valve and a three-way valve. The first switch valve is arranged at the outlet part for selectively opening or closing the outlet. The second switch valve is arranged at the inlet part for selectively opening or closing the inlet. The three-way valve includes a first branch, a second branch and a third branch. The first branch is connected to the inlet, the second branch is connected to the heat exchange medium source, and the third branch is connected to the insulation medium source.

5. The battery device according to claim 1, wherein: The heat exchange assembly further includes a storage element, which is used to store the heat exchange medium discharged from the medium flow channel.

6. The battery device according to claim 1, wherein: The at least two flexible members are configured as metal plasticized films.

7. The battery device according to claim 6, characterized in that The at least two flexible members are configured as aluminum-plastic films.

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

9. The battery device according to claim 8, characterized in that The metal layer includes one of aluminum foil, copper foil and steel foil.

10. The battery device according to claim 8, characterized in that The non-metallic layer includes one of polypropylene, polyvinyl chloride and polyethylene.

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

12. The battery device according to claim 1, wherein: The flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

13. The battery device according to claim 12, characterized in that The thickness of the isolation layer is 6.5 μm-100 μm.

14. The battery device according to claim 13, wherein: The thickness of the isolation layer is 6.5 μm-15 μm.

15. The battery device according to claim 12, wherein: The thickness of the corrosion-resistant layer is 5 μm-20 μm.

16. The battery device according to claim 12, wherein: The thickness of the waterproof layer is 50 μm-120 μm.

17. The battery device according to claim 1, wherein: The thickness of the flexible member is 0.05mm-0.3mm.

18. The battery device according to claim 17, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

19. The battery device according to claim 1, wherein: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

20. The battery device according to claim 1, wherein: The at least two flexible parts include a hot pressing area, and the hot pressing area is configured such that the at least two flexible parts are formed by hot pressing. The hot pressing area separates the heat exchange component to form the at least one medium flow channel.

21. A heat exchange component, characterized in that: The heat exchange component is the heat exchange component of the battery device according to any one of claims 1 to 20, and the heat exchange component is used to exchange heat with the battery cell assembly.

22. An electrical device, characterized in that: The method comprises the battery device according to any one of claims 1 to 20 or the heat exchange component according to claim 21.

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