Heat exchange assembly, battery device, electric equipment and control method of battery device

Abstract

The embodiment of the invention provides a heat exchange assembly, a battery device, electric equipment and a control method of the battery device. The battery device comprises a box body assembly, a battery monomer assembly and a heat exchange assembly, the battery monomer assembly is arranged in the box body assembly, the heat exchange assembly is provided with an inlet part, an outlet part and at least one medium flow channel, and the medium flow channel is communicated with an inlet of the inlet part and an outlet of the outlet part; the battery device comprises a first state and a second state different from the first state, and the control method comprises the steps that in the first state, the medium flow channel is controlled to be filled with a heat exchange medium; wherein the first state is a cooling state for cooling the battery monomer assembly through the heat exchange assembly; and in the second state, the heat exchange medium in the medium flow channel is discharged, and the outlet and the inlet are closed. 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] This application relates to the field of battery device technology, and in particular to a heat exchange component, a battery device, an electrical device, and a control method for the battery device. Background Technology

[0002] This section is intended to provide background or context for embodiments of this application. The description herein is not intended to imply that it is prior art simply because it is included in this section.

[0003] In new energy vehicles equipped with battery devices, the battery devices can provide all or part of the power. During the use of the battery devices, the individual battery cells generate heat. If this heat is too high, it will adversely affect the performance and lifespan of the battery device. Therefore, how to effectively dissipate heat from the individual battery cells has become an important research direction in this field. Summary of the Invention

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

[0005] To achieve the above objectives, a first aspect of this application provides a control method for a battery device. The battery device includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within the housing assembly. The heat exchange assembly has an inlet, an outlet, and at least one medium flow channel. The medium flow channel connects the inlet of the inlet and the outlet of the outlet. The battery device includes a first state and a second state different from the first state. The control method includes:

[0006] In the first state, the medium flow channel is controlled to be filled with heat exchange medium; wherein, the first state is a cooling state in which the battery cell assembly is cooled by the heat exchange component.

[0007] In the second state, the heat exchange medium in the medium flow channel is discharged, and the outlet and the inlet are closed.

[0008] The control method for a battery device provided in this application includes a housing assembly, battery cell assemblies, and a heat exchange assembly. The battery cell assemblies are disposed within the housing assembly, which protects them. The heat exchange assembly exchanges heat with the battery cell assemblies. The battery device includes a first state and a second state distinct from the first state. In the first state, i.e., the cooling state, a heat exchange medium is filled into the medium flow channel of the heat exchange assembly to cool the battery cell assemblies. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel is discharged, and the outlet and inlet are closed. This improves the situation of heat exchange medium leakage, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device, causing insulation failure, or even short circuit and fire. It also improves the heating efficiency and heat preservation effect of the battery device.

[0009] In some embodiments, the second state includes states other than the battery cell assembly being in a cooled state.

[0010] In other words, the heat exchange medium in the medium flow channel can be discharged in any state other than when the battery cell assembly is in a cooled state.

[0011] In some embodiments, the second state includes a heating state in which the battery cell assembly is heated.

[0012] By discharging the heat exchange medium from the medium flow channel, the heating device can quickly heat the battery device after the heat exchange medium is discharged, reducing the heat absorption of the heat exchange medium and thus improving the heating efficiency of the battery device.

[0013] In some embodiments, the second state includes the battery cell assembly being in a quiescent state of the battery device.

[0014] By draining the heat exchange medium from the flow channel, thus eliminating its filling, leakage can be mitigated. This prevents leaked heat exchange medium from slowly seeping into the battery unit, causing insulation failure, or even short circuits and fires. Furthermore, it improves the battery unit's insulation performance.

[0015] In some embodiments, after the heat exchange medium in the medium flow channel is discharged, the control method further includes:

[0016] The medium is filled with a heat-insulating medium, the thermal conductivity of which is lower than that of the heat exchange medium.

[0017] Here, the thermal conductivity of the insulation medium is less than that of the heat exchange medium. Therefore, in the second state, it is beneficial to improve the heating device's ability to heat the battery device quickly and increase the heating efficiency of the battery device.

[0018] In addition, if the battery cell is in a low-temperature static state, and the medium flow channel is filled with heat-insulating medium, it will help to improve the heat loss of the battery device through the heat exchange components to a certain extent, thereby improving the heat preservation effect of the battery device.

[0019] In some embodiments, the insulating medium is air.

[0020] The heat exchange medium in the medium flow channel can be discharged and air can be introduced to achieve heat insulation of the battery device and achieve a heat preservation effect.

[0021] In some embodiments, the heat exchange assembly includes at least two flexible elements stacked together, and at least one medium flow channel is formed between the flexible elements.

[0022] In this embodiment, by configuring the heat exchange component to include at least two flexible elements, the lightweight nature of the flexible elements helps to reduce the weight of the battery device, lower the production cost of the heat exchange component, and improve the energy density of the battery device. On the other hand, it allows the heat exchange component to fit better with the housing component and / or the battery cell component, thereby facilitating the absorption of assembly tolerances of the heat exchange component. It eliminates the need for the use of sealant or thermally conductive materials, improves the fit between the heat exchange component and the housing component and / or the battery cell component, and increases the effective heat exchange area between the heat exchange component and the housing component and / or the battery cell component, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0023] In some embodiments, the heat exchange assembly further includes a first switching valve, a second switching valve, and a three-way valve. The first switching valve is disposed at the outlet and is used to selectively open or close the outlet. The second switching valve is disposed at the inlet and is used to selectively open or close 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 a heat exchange medium source, and the third branch is connected to a heat insulation medium source. The step of discharging the heat exchange medium in the medium flow channel includes:

[0024] Control the outlet to open, control the second branch to close, and control the third branch to open;

[0025] The heat exchange medium in the medium flow channel is discharged, and the heat insulation medium source is controlled to fill the heat insulation medium into the medium flow channel;

[0026] Control the outlet to close, and control the third branch to close.

[0027] By coordinating the first switching valve, the second switching valve, and the three-way valve, the heat exchange medium and / or insulation medium can be discharged, or the heat exchange medium and / or insulation medium can be filled.

[0028] In some embodiments, the heat exchange assembly further includes a storage element for storing the heat exchange medium discharged from the medium channel.

[0029] Here, the specific type of storage device is not limited. The storage device is a container with a certain volume used to store the heat exchange medium discharged from the medium flow channel.

[0030] A second aspect of this application provides a heat exchange component, which is the heat exchange component of the battery device described above, and the heat exchange component is used to exchange heat with the battery cell assembly.

[0031] The heat exchange component provided in this application is used for heat exchange with individual battery cells. The battery device includes a first state and a second state. In the first state, i.e., the cooling state, a heat exchange medium is filled into the medium flow channel of the heat exchange component to cool the individual battery cells. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel is discharged, and the outlet and inlet are closed. This improves the situation of heat exchange medium leakage, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device, causing insulation failure, or even short circuit and fire in the battery device. It can also improve the heating efficiency and heat preservation effect of the battery device.

[0032] A third aspect of this application provides a battery device, including:

[0033] Enclosure assembly;

[0034] A battery cell assembly is disposed within the housing assembly;

[0035] A heat exchange assembly is used to exchange heat with the battery cell assembly; wherein the heat exchange assembly includes an inlet, an outlet 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 and the outlet of the outlet are both connected to the medium flow channel;

[0036] A 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 component is used to cool the battery cell assembly. In the second state, the medium flow channel is not filled with a heat exchange medium.

[0037] The battery device provided in this application includes a housing assembly, battery cell assemblies, and a heat exchange assembly. The battery cell assemblies are disposed within a first receiving cavity of the housing assembly, which protects them. The heat exchange assembly exchanges heat with the battery cell assemblies. The battery device includes a first state and a second state. In the first state, i.e., the cooling state, a heat exchange medium is filled into the medium flow channel of the heat exchange assembly to cool the battery cell assemblies. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel is discharged, and the outlet and inlet are closed. This improves the situation of heat exchange medium leakage, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device, causing insulation failure, or even short circuit and fire. It also improves the heating efficiency and heat preservation effect of the battery device.

[0038] In some embodiments, in the second state, the medium flow channel is filled with a heat-insulating medium, the thermal conductivity of which is lower than that of the heat exchange medium.

[0039] The thermal conductivity of the insulation medium is less than that of the heat exchange medium. Therefore, in the second state, it is beneficial to improve the heating efficiency of the battery device by enabling the heating device to heat the battery device quickly.

[0040] In addition, if the battery cell is in a low-temperature static state, and the medium flow channel is filled with heat-insulating medium, it will help to improve the heat loss of the battery device through the heat exchange components to a certain extent, thereby improving the heat preservation effect of the battery device.

[0041] In some embodiments, the insulating medium is air.

[0042] In the second state, the heat exchange medium in the medium flow channel can be discharged and air can be introduced to achieve heat insulation of the battery device and achieve a heat preservation effect.

[0043] In some embodiments, the heat exchange assembly further includes a first switching valve, a second switching valve, and a three-way valve. The first switching valve is disposed at the outlet and is used to selectively open or close the outlet. The second switching valve is disposed at the inlet and is used to selectively open or close 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 heat insulation medium source.

[0044] In this embodiment, the cooperation of the first switching valve, the second switching valve, and the three-way valve can achieve the discharge of heat exchange medium and / or heat insulation medium, or the filling of heat exchange medium and / or heat insulation medium.

[0045] In some embodiments, the heat exchange assembly further includes a storage element for storing the heat exchange medium discharged from the medium channel.

[0046] Here, the specific type of storage device is not limited. The storage device is a container with a certain volume used to store the heat exchange medium discharged from the medium flow channel.

[0047] In some embodiments, the heat exchange assembly is disposed on the outer side of the first receiving cavity.

[0048] In this embodiment, by providing a heat exchange component on the outside of the first receiving cavity, the heat exchange component is separated from the battery cell assembly, avoiding the problem of the heat exchange medium of the heat exchange component leaking and coming into contact with the battery cell assembly, thereby causing a short circuit in the battery device and improving the safety performance and reliability of the battery device.

[0049] In some embodiments, the housing assembly includes a housing body and a bottom protective plate. The housing body includes a first housing portion and a second housing portion, with a first receiving cavity formed between the first housing portion and the second housing portion. A second receiving cavity is formed between the bottom protective plate and the second housing portion, and the heat exchange assembly is disposed in the second receiving cavity.

[0050] In this embodiment, a bottom protective plate is provided on the outside of the housing body, defining a second receiving cavity between the bottom protective plate and the second housing part. A heat exchange component is then placed within this second receiving cavity for heat exchange with the housing body, thereby achieving heat exchange for the battery cell assembly housed within the housing body. In other words, by placing the heat exchange component outside the first receiving cavity of the housing assembly, the problem of short circuits in the battery device due to leakage of the heat exchange medium can be avoided to a certain extent, improving the safety and reliability of the battery device. Furthermore, the utilization rate of the internal receiving cavity of the housing assembly can be increased, thus improving the compactness of the battery device. On the other hand, by providing the bottom protective plate, which cooperates with the housing body to connect and protect the battery cell assembly, the reliability of the housing assembly is further improved.

[0051] In some embodiments, the at least two flexible elements are configured as metal plasticized films.

[0052] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel is formed between at least two metal plasticized films, it is not affected by the extrusion process and does not need to meet a large thickness requirement, thus reducing the overall thickness and weight of the heat exchange assembly. Simultaneously, because the heat exchange assembly has insulating properties, the risk of insulation failure can be avoided. Furthermore, the heat exchange assembly does not react with the internally flowing heat exchange medium, therefore there is no risk of corrosion leakage.

[0053] In some embodiments, the at least two flexible elements are configured as aluminum-plastic films.

[0054] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0055] In some embodiments, the at least two flexible elements include a hot-pressed region configured such that the at least two flexible elements are formed by hot pressing, and the hot-pressed region divides the heat exchange assembly to form the at least one medium flow channel.

[0056] The flexible component is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing. The hot pressing area divides the heat exchange component to form at least one medium flow channel. This forming method is simple.

[0057] In some embodiments, the flexible element is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked sequentially.

[0058] In this embodiment, the flexible component, composed of sequentially stacked metal and non-metal layers, is thin and lightweight. Furthermore, by forming a media flow channel between at least two flexible components, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly. In addition, the heat exchange assembly does not react with the internally flowing heat exchange medium, therefore eliminating the risk of corrosion and leakage.

[0059] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0060] This allows flexible components to have a certain structural strength and to serve as an isolation mechanism.

[0061] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0062] This allows flexible components to have a certain degree of waterproofing.

[0063] In some embodiments, the non-metallic layer is a hot-melt layer.

[0064] Here, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metallic layer together through hot melting, which is simple to form and has high production efficiency.

[0065] In some embodiments, the flexible element has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, wherein the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

[0066] In this embodiment, by configuring the flexible component to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer, which helps to improve the reliability of the heat exchange component.

[0067] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0068] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-100μm, the flexible component can have a certain structural strength and flexibility.

[0069] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0070] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-15μm, the flexible component can be further made to have a certain structural strength and flexibility.

[0071] In some embodiments, the thickness of the corrosion-resistant layer is 5μm-20μm.

[0072] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5μm-20μm, the wear resistance and toughness of the flexible component can be improved.

[0073] In some embodiments, the thickness of the waterproof layer is 50μm-120μm.

[0074] In this embodiment, by setting the thickness of the waterproof layer to 50μm-120μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate the hot pressing connection of flexible components through the waterproof layer.

[0075] In some embodiments, the thickness of the flexible element is 0.05mm-0.3mm.

[0076] By setting the thickness of the flexible component to 0.05mm-0.3mm, the heat exchange assembly made of the flexible component has a certain structural strength while making the overall thickness of the heat exchange assembly small, which is beneficial to reducing the overall volume and weight of the battery and thus increasing the energy density of the battery.

[0077] In some embodiments, the thickness of the flexible element is 0.08 mm to 0.2 mm.

[0078] By setting the thickness of the flexible component to 0.08mm-0.2mm, the heat exchange assembly made of the flexible component has a certain structural strength, while further reducing the overall thickness of the heat exchange assembly. This is beneficial to further reduce the overall volume and weight of the battery, thereby further increasing the energy density of the battery.

[0079] In some embodiments, the elastic modulus of the flexible element is 0.1 MPa-10000 MPa.

[0080] In this embodiment, by setting the elastic modulus of the flexible component to 0.1MPa-10000MPa, the flexible component has a certain structural strength, which improves the reliability of the heat exchange assembly and also has a certain deformation capacity. This can improve the fit between the heat exchange assembly and the housing assembly and / or the battery assembly and battery cell assembly, thereby increasing the effective heat exchange area between the heat exchange assembly and the housing assembly and / or the battery assembly and battery cell assembly, thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0081] A fourth aspect of this application provides an electrical device including the battery device described above, the battery device being used to provide electrical energy.

[0082] The battery device for an electrical device provided in this application includes a housing assembly, battery cell assemblies, and a heat exchange assembly. The battery cell assemblies are disposed within a first receiving cavity of the housing assembly, which protects them. The heat exchange assembly exchanges heat with the battery cell assemblies. The battery device includes a first state and a second state. In the first state, i.e., the cooling state, a heat exchange medium is filled into the medium flow channel of the heat exchange assembly to cool the battery cell assemblies. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel is discharged, and the outlet and inlet are closed. This improves the situation of heat exchange medium leakage, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device, causing insulation failure, or even short circuit and fire. It also improves the heating efficiency and heat preservation effect of the battery device. Attached Figure Description

[0083] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0084] Figure 2 This is an exploded perspective view of a battery device provided in an embodiment of this application, wherein the heat exchange component is disposed in the second receiving cavity;

[0085] Figure 3 A cross-sectional view of a battery device provided in an embodiment of this application;

[0086] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0087] Figure 5 This is a schematic diagram of the connection structure between the heat exchange component and the bottom cover plate provided in an embodiment of this application;

[0088] Figure 6This is a schematic diagram of the structure of a heat exchange component provided in one embodiment of this application;

[0089] Figure 7 This is a schematic diagram of the structure of a bottom protective plate provided in one embodiment of this application;

[0090] Figure 8 This is an exploded perspective view of a battery device provided in an embodiment of this application, wherein the heat exchange component is disposed within the first receiving cavity;

[0091] Figure 9 for Figure 8 The diagram shows the structure of the heat exchange assembly.

[0092] Figure 10 A flowchart illustrating a control method for a battery device provided in an embodiment of this application.

[0093] Explanation of reference numerals in the attached figures

[0094] 10. Battery cell assembly; 11. Battery unit cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 212. Second housing section; 22. Bottom protective plate; 221. Connecting part; 222. Support structure; 23. First receiving cavity; 24. Second receiving cavity; 30. Heat exchange assembly; 31. Flexible component; 32. Medium flow channel; 33. Clearance hole; 34. Hot pressing area; 35. Inlet; 36. Outlet; 37. First switching valve; 38. Three-way valve; 381. First branch; 382. Second branch; 383. Third branch; 100. Battery unit; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0095] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0096] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0097] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0098] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0099] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0100] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0101] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0102] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0103] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0104] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0105] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0106] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0107] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0108] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0109] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0110] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0111] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0112] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0113] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0114] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0115] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0116] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0117] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0118] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0119] Liquid electrolytes include electrolyte salts and solvents.

[0120] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0121] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0122] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0123] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0124] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0125] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0126] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0127] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0128] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0129] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0130] In some implementations, the electrode assembly is a stacked structure.

[0131] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0132] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0133] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0134] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0135] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0136] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0137] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0138] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0139] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0140] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0141] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0142] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0143] Power plants are demanding increasingly higher energy density from the surface area of ​​energy storage containers. Consequently, to increase power output, the weight of these containers also increases. However, these containers need to be transported from the production site to the usage site via land and / or sea transport. Land and sea transport typically have weight restrictions, creating a conflict between increasing energy density and the weight of energy storage containers.

[0144] During the use of a battery device, the individual battery cells generate heat. Excessive heat can negatively impact the performance and lifespan of the battery device. Therefore, effectively dissipating heat from the battery cells has become an important research direction in this field. Related technologies utilize a cooling system installed within the battery device housing to cool the individual battery cells. This cooling system may include multiple aluminum water-cooled plates laid within the battery device housing, with the surfaces of these plates in contact with the surfaces of the individual battery cells. During use, a heat exchange medium, such as water, flows through these water-cooled plates, carrying away heat from the battery cells and cooling them down. However, when the aluminum water-cooled plates in the cooling system do not adhere well to the surfaces of the battery cells, the heat exchange efficiency and effect are poor. Furthermore, assembly tolerance compensation and the use of sealant are required during assembly with the battery cell assembly, resulting in higher production costs. In addition, the water-cooling plate and battery pack are highly rigid and require the use of hard structural adhesive, making disassembly difficult. If self-adhesive, soft, or double-sided adhesive is used, the rigidity of the water-cooling plate and battery pack is relatively good, but when there are gaps and mismatches in flatness, there will be problems with the adhesive coming unglued.

[0145] Therefore, to improve the heat exchange efficiency and effect of the battery device, this application provides a battery device including a housing assembly, a battery cell assembly, a heat exchange assembly, and a controller. The battery cell assembly is disposed within the housing assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. The heat exchange assembly includes an inlet, an outlet, and at least two flexible members, with at least one medium flow channel formed between the at least two flexible members. The inlet of the inlet and the outlet of the outlet 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.

[0146] The battery device provided in this application includes a housing assembly, battery cell assemblies, and a heat exchange assembly. The battery cell assemblies are disposed within the housing assembly, which protects them. The heat exchange assembly exchanges heat with the battery cell assemblies. The battery device includes a first state and a second state. In the first state, i.e., the cooling state, a heat exchange medium is filled into the medium flow channel of the heat exchange assembly to cool the battery cell assemblies. In the second state, i.e., the non-cooling state, the heat exchange medium in the medium flow channel is discharged, meaning the medium flow channel is not filled with heat exchange medium, and the outlet and inlet are closed. This improves the situation of heat exchange medium leakage, thereby preventing the leaked heat exchange medium from slowly seeping into the battery device, causing insulation failure, or even short circuit and fire. It also improves the heating efficiency and heat preservation effect of the battery device.

[0147] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0148] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0149] It should be noted that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housing components and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0150] Please refer to Figure 1The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0151] To meet different power demands, the battery device 100 includes a battery cell assembly 10, which may include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration and then housed within a housing assembly 20. Alternatively, the battery device 100 can also consist of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form battery modules, which are then connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 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 to these. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0152] The battery device 100 provided in this application includes a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The battery cell assembly 10 is disposed within the housing assembly 20. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10. The heat exchange assembly 30 includes an inlet 35, an outlet 36, and at least two flexible members. At least one medium flow channel 32 is formed between the at least two flexible members, and the inlet of the inlet 35 and the outlet of the outlet 36 are both connected to the medium flow channel 32. A 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.

[0153] Please refer to Figure 2 and Figure 8 The battery device 100 includes a housing assembly 20 and a battery cell assembly 10. The battery cell assembly 10 includes at least one battery cell 11, which is disposed within the first receiving cavity 23 of the housing assembly 20.

[0154] The enclosure component 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the enclosure component 20 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0155] The housing assembly 20 is used to encapsulate the battery cell assembly 10. The housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell assembly 10.

[0156] This application 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 the embodiments of this application, and the heat exchange component 30 is used to exchange heat with the battery cell assembly 10.

[0157] Here, the housing assembly 20 has a first receiving cavity 23. The heat exchange assembly 30 can be disposed inside the first receiving cavity 23, that is, it can be in direct contact with the battery cell assembly 10, or it can be disposed outside the first receiving cavity 23, and heat is transferred through an intermediate medium, thereby realizing heat exchange between the heat exchange assembly 30 and the battery cell assembly 10.

[0158] The heat exchange assembly 30 includes at least two flexible members 31, which are stacked together, and at least one medium flow channel 32 is formed between the flexible members 31. The at least one medium flow channel 32 is used to conduct heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0159] The heat exchange assembly 30 includes at least two flexible elements 31, meaning that the number of flexible elements 31 included in the heat exchange assembly 30 can be two or more.

[0160] Here, the flexibility in flexible component 31 refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus. As an example, the material of flexible component 31 can be selected as a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of flexible component 31. By setting the heat exchange assembly 30 in the form of flexible component 31 in this embodiment, it is beneficial to reduce the weight of heat exchange assembly 30.

[0161] At least one medium flow channel 32 is formed between at least two flexible members 31, meaning that the heat exchange assembly 30 forms a medium flow channel 32 between adjacent flexible members 31. The heat exchange medium flows within the medium flow channel 32 to exchange heat with the battery cell assembly 10.

[0162] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a cooling effect on the battery cell 11, such as being gaseous or liquid. In this embodiment, a coolant is used as an example for description.

[0163] In the first state, the medium flow channel 32 is filled with heat exchange medium, and the heat exchange component 30 is used to cool the battery cell assembly 10. In other words, the battery device 100 is in a cooling state at this time.

[0164] In the second state, by discharging the heat exchange medium in 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 improving the situation where the leaked heat exchange medium slowly seeps into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100.

[0165] Here, the second state can refer to any state other than the battery cell assembly 10 being in a cooled state.

[0166] For example, the second state includes a heating state in which the battery cell assembly 10 is heated.

[0167] Understandably, when the battery cell assembly 10 is under heating, if the medium flow channel 32 is filled with heat exchange medium, some heat will be carried away by the heat exchange medium during the heating of the battery device 100, 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 the absorption of heat by the heat exchange medium and thus improving the heating efficiency of the battery device 100.

[0168] Here, the heating device is, for example, a heating film.

[0169] For example, the second state includes the battery cell assembly 10 being in a stationary state.

[0170] It is understandable that when the battery cell assembly 10 is in a static state, i.e., when the battery cell assembly 10 does not require cooling or heat dissipation, if the medium flow channel 32 is filled with heat exchange medium, micro-leakage may occur. The leaked heat exchange medium can slowly seep into the battery device 100, potentially causing 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, thus eliminating the presence of heat exchange medium in the medium flow channel 32, the leakage of heat exchange medium can be mitigated, thereby reducing the risk of the leaked heat exchange medium slowly seeping into the battery device 100, causing insulation failure, or even a short circuit and fire in the battery device 100.

[0171] Furthermore, if the battery cell assembly 10 is in a low-temperature static state, and if the medium flow channel 32 is filled with heat exchange medium, a large amount of heat at the bottom of the battery device 100 will be lost through the heat exchange medium, resulting in poor heat preservation. 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 heat preservation effect of the battery device 100 is improved.

[0172] For example, please refer to Figure 5 and Figure 6 The heat exchange component 30 also includes an inlet section 35 and an outlet section 36, with the inlet of the inlet section 35 and the outlet of the outlet section 36 both connected to the medium flow channel 32.

[0173] Here, the inlet 35 and outlet 36 of the heat exchange assembly 30 are used for connecting to the pipeline of the vehicle.

[0174] The heat exchange component 30 having at least two medium flow channels 32 means that the number of medium flow channels 32 is two or more.

[0175] The principle of heat exchange component 30 for heat dissipation of battery cell assembly 10 is as follows: the heat exchange medium output from the heat exchange medium source (not shown in the figure) enters the medium flow channel through the inlet of heat exchange component 30. After the heat exchange medium exchanges heat with battery cell assembly 10, the heat exchange medium flows out through the outlet of heat exchange component 30, thus completing the heat exchange of battery cell assembly 10.

[0176] The flexible component 31 is configured as a flexible structure. The flexible component 31 has certain expandable or contractible characteristics. It can also be understood that the flexible component 31 can be an elastically deformable structure. The flexible component 31 has the ability to deform and recover its deformation, so that the heat exchange assembly 30 can be formed into a contoured structure. The heat exchange assembly 30 can better adapt to the external contour shape of the battery cell or other components, so as to improve the fit between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, and thus improving the heat exchange efficiency.

[0177] In addition, the flexible component 31 of the flexible structure is more conducive to discharging the heat exchange medium in the medium flow channel 32.

[0178] It should be noted that the flexible component 31 can have conductive properties, which is beneficial for equipotential setting; the flexible component 31 can also have electrical insulation properties, eliminating the need for insulation treatment, which helps reduce the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0179] The battery device provided in this application includes a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The battery cell assembly 10 is disposed in the first receiving cavity 23 of the housing assembly 20, and the housing 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 element 31, which is lightweight and helps to reduce the weight of the battery device 100, reduce the production cost of the heat exchange component 30, and improve the energy density of the battery device 100. On the other hand, by setting the flexible element 31 as a flexible structure, the heat exchange component 30 can fit better with the housing assembly 20 and / or the battery cell assembly 10, thereby absorbing the assembly tolerance of the heat exchange component 30, eliminating the need for sealant or thermal conductive material, improving the fit between the heat exchange component 30 and the housing assembly 20 and / or the battery cell assembly 10, increasing the effective heat exchange area between the heat exchange component 30 and the housing assembly 20 and / or the battery cell assembly 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0180] Furthermore, the battery device 100 includes a first state and a second state. In the first state, i.e., the cooling state, heat exchange medium is filled in the medium flow channel 32 of the heat exchange component 30 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, so that the medium flow channel 32 is not filled with heat exchange medium, and the outlet 36 and the inlet 35 are closed. This can improve the situation of heat exchange medium leakage, thereby improving the situation where leaked heat exchange medium slowly seeps into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100; it can also improve the heating efficiency and heat preservation effect of the battery device 100.

[0181] Here, the heat exchange component 30 can be disposed in the first receiving cavity 23, that is, the heat exchange component 30 can be in direct contact with the battery cell assembly 10, thereby further improving the heat exchange efficiency between the heat exchange component 30 and the battery cell assembly 10.

[0182] Of course, in other implementation methods, please refer to Figure 2 A heat exchange assembly 30 may be provided on the outer side of the first receiving cavity 23.

[0183] That is, at least a portion of the heat exchange components 30 are disposed on the outside of the first receiving cavity 23, so as to separate the heat exchange components 30 from the battery cell assembly 10.

[0184] In related technologies, heat exchange components and battery cell components are located in the same space. When the heat exchange medium in the cooling system is prone to leakage, the risk of short circuit in the battery cell components inside the battery device box increases, affecting the reliability of the battery device.

[0185] In this embodiment, by providing a heat exchange component 30 on the outside of the first receiving cavity 23, the heat exchange component 30 is separated from the battery cell assembly 10, reducing the risk of the heat exchange medium of the heat exchange component 30 coming into contact with the battery cell assembly 10 after leakage, thereby reducing the risk of short circuit of the battery device 100 and improving the reliability of the battery device 100.

[0186] The housing assembly 20 is used to house the battery cell assembly 10, and the housing assembly 20 can have various structures. See some embodiments. Figure 2 and Figure 8The housing assembly 20 includes a housing body 21, which may include a first housing portion 211 and a second housing portion 212. The first housing portion 211 and the second housing portion 212 overlap each other, and together define a first receiving cavity 23 for accommodating the battery cell assembly 10. The second housing portion 212 may be a hollow structure with one open end, and the first housing portion 211 may be a plate-like structure. The first housing portion 211 overlaps the open side of the second housing portion 212 to form a housing body 21 with the first receiving cavity 23. Alternatively, both the first housing portion 211 and the second housing portion 212 may be hollow structures with one open side, and the open side of the first housing portion 211 overlaps the open side of the second housing portion 212 to form a housing body 21 with the first receiving cavity 23. Of course, the first housing portion 211 and the second housing portion 212 may be of various shapes, such as cylinders, cuboids, etc.

[0187] To improve the sealing performance after the first housing part 211 and the second housing part 212 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 211 and the second housing part 212.

[0188] Assuming that the first box part 211 covers the top of the second box part 212, the first box part 211 can also be called the upper box cover, and the second box part 212 can also be called the lower box cover.

[0189] In other embodiments, the housing assembly 20 includes a housing body 21 and a bottom protective plate 22. A second receiving cavity 24 is formed between the bottom protective plate 22 and the outer side wall of the housing body 21. A heat exchange assembly 30 is disposed within the second receiving cavity 24.

[0190] It should be noted that the bottom guard plate 22 can be located at the bottom of the box body 21, in which case the bottom guard plate 22 is, for example, a bottom guard plate 22. The bottom guard plate 22 can also be located at the top of the box body 21, or it can be located on the side of the box body 21.

[0191] For example, please refer to Figure 2 The housing assembly 20 includes a housing body 21 and a bottom protective plate 22. The housing body 21 includes a first housing part 211 and a second housing part 212. A first receiving cavity 23 is formed between the first housing part 211 and the second housing part 212. A second receiving cavity 24 is formed between the bottom protective plate 22 and the second housing part 212. A heat exchange assembly 30 is disposed in the second receiving cavity 24.

[0192] Here, the provision of heat exchange component 30 in the second receiving cavity 24 means that the heat exchange component 30 can be provided only in the second receiving cavity 24, or the heat exchange component 30 can be provided in other areas besides the second receiving cavity 24.

[0193] A second receiving cavity 24 is formed between the bottom protective plate 22 and the second housing part 212, that is, the first receiving cavity 23 and the second receiving cavity 24 are separated.

[0194] Here, by setting the bottom guard plate 22, the heat exchange component 30 can be supported and protected.

[0195] The heat exchange component 30 is disposed in the second receiving cavity 24, that is, the heat exchange component 30 is disposed outside the first receiving cavity 23, so as to separate the heat exchange component 30 from the battery cell assembly 10, avoid the heat exchange medium of the heat exchange component 30 from contacting the battery cell assembly 10, thereby preventing the battery device 100 from short-circuiting, and improving the safety performance and reliability of the battery device 100.

[0196] In this embodiment, a bottom protective plate 22 is provided on the outside of the housing body 21, defining a second receiving cavity 24 between the bottom protective plate 22 and the second housing part 212. A heat exchange assembly 30 is disposed within the second receiving cavity 24 for heat exchange with the housing body 21, thereby achieving heat exchange for the battery cell assembly 10 carried within the housing body 21. In other words, by placing the heat exchange assembly 30 on the outside of the first receiving cavity 23 of the housing assembly 20, the problem of short circuit in 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, improving the safety and reliability of the battery device 100. Furthermore, the utilization rate of the internal receiving cavity of the housing assembly 20 can be increased, thereby improving the compactness of the battery device 100. On the other hand, by providing the bottom protective plate 22, which cooperates with the housing body 21 to connect and protect the battery cell assembly 10, the reliability of the housing assembly 20 is further improved.

[0197] In some embodiments, please refer to Figure 2 and Figure 7 A portion of the bottom protective plate 22 protrudes to form a connecting part 221, which is sealed to the second housing part 212.

[0198] A portion of the bottom guard plate 22 protrudes to form a connecting part 221, which is used to connect with the second housing part 212.

[0199] For example, the edge of the bottom guard plate 22 protrudes to form a ring of connecting portions 221, that is, the outermost ring of the bottom guard plate 22 protrudes to form a ring of connecting portions 221.

[0200] The specific manner in which the connecting part 221 is connected to the second housing part 212 is not limited here. For example, the connecting part 221 and the second housing part 212 are fastened together by bolts, screws or rivets.

[0201] In this embodiment, by forming a protruding connecting portion 221, a second receiving cavity 24 is defined between the bottom protective plate 22 and the second housing portion 212, while simultaneously connecting with the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 effectively prevents mud, sand, or water from entering the second receiving cavity 24, thus protecting the heat exchange assembly 30 within the second receiving cavity 24.

[0202] In some embodiments, the housing assembly 20 further includes a seal (not shown) that is sealed between the connecting portion 221 and the second housing portion 212.

[0203] For example, the seal is a sealing strip.

[0204] In this embodiment, by providing a sealing element and sealing the sealing element between the connecting part 221 and the second housing part 212, that is, by sealing the gap between the connecting part 221 and the second housing part 212, it is further beneficial to prevent mud or water from entering the second receiving cavity 24, thereby improving the sealing performance between the bottom guard plate 22 and the second housing part 212.

[0205] In some embodiments, please refer to Figure 2 and Figure 7 A portion of the bottom protective plate 22 protrudes to form a support structure 222. The support structure 222 is used to support the flexible member 31 and / or the second housing portion 212.

[0206] Here, "support structure 222 for supporting flexible member 31 and / or second housing portion 212" means that support structure 222 abuts against flexible member 31 and / or second housing portion 212, providing a certain supporting force to flexible member 31 and / or second housing portion 212. That is to say, support structure 222 can be used to support flexible member 31, support second housing portion 212, or support both flexible member 31 and second housing portion 212.

[0207] It should be noted that the bottom guard plate 22 protrudes in a certain area to form a support structure 222. This can mean that the side of the bottom guard plate 22 away from the box body 21 is recessed, so that the side of the bottom guard plate 22 facing the box body 21 protrudes to form a support structure 222; or the side of the bottom guard plate 22 away from the box body 21 is not recessed, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protrudes to form a support structure 222.

[0208] The support structure 222 is used to support the flexible member 31 and / or the second housing part 212, so that a fixed space is formed between the bottom protective plate 22 and the second housing part 212, which helps to improve the reliability of the battery device 100.

[0209] In this embodiment, the bottom protective plate 22 is provided with a support structure 222 to support the flexible member 31 and / or the second housing part 212. This helps to improve the problem of deformation of the second housing part 212 due to insufficient support strength under pressure. This can improve the problem of the second housing part 212 directly contacting the heat exchange component 30 and causing the heat exchange component 30 to collapse. This helps 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.

[0210] In some embodiments, the support structure 222 abuts the flexible member 31 against the second housing portion 212 to support the flexible member 31 and the second housing portion 212.

[0211] For example, in an embodiment where the support structure 222 is used to support the flexible member 31, the support structure 222 may support the surface of the flexible member 31 and abut the flexible member 31 against the second housing portion 212.

[0212] In this embodiment, the flexible component 31 is abutted against the second housing part 212 by setting the support structure 222. While supporting the second housing part 212, the heat exchange component 30 can also be fixed, thereby improving the stability of the heat exchange component 30.

[0213] In some embodiments, please refer to Figures 2 to 7 The heat exchange component 30 is provided with a clearance hole 33, and the support structure 222 passes through the clearance hole 33 to abut against the second housing part 212.

[0214] Here, the heat exchange component 30 is provided with a clearance hole 33, that is, the flexible component 31 is provided with a clearance hole 33, and the clearance hole 33 penetrates through the opposite sides of the heat exchange component 30 in the thickness direction.

[0215] It should be noted that the clearance hole 33 must avoid the medium flow channel 32.

[0216] The specific location and number of clearance holes 33 are not limited here. They will be determined based on the specific circumstances.

[0217] For example, in an embodiment where the support structure 222 supports the second housing portion 212, the heat exchange assembly 30 may be provided with a clearance hole 33 to allow the support structure 222 to pass through the clearance hole 33 and abut against the second housing portion 212.

[0218] In this embodiment, the heat exchange component 30 avoids the support structure 222 by setting the avoidance hole 33. The support structure 222 passes through the avoidance hole 33 to abut against the second housing part 212. While supporting the second housing part 212, it can also position the heat exchange component 30, thereby improving the stability of the heat exchange component 30.

[0219] In some embodiments, please refer to Figures 2 to 6 At least two flexible components 31 are configured as metal plasticized films.

[0220] The flexible component 31 is a single-layer or multi-layer thin film.

[0221] Here, the metal plastic film is a metal-plastic composite material, which includes a metal layer and a plastic layer.

[0222] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel 32 is formed between at least two metal plasticized films, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly 30 can be reduced. Simultaneously, because the heat exchange assembly 30 has insulating properties, the risk of insulation failure can be reduced. This also reduces the risk of the heat exchange assembly 30 reacting with the internally flowing heat exchange medium, further reducing the risk of heat exchange medium corrosion and leakage.

[0223] For example, at least two flexible elements 31 are configured as aluminum-plastic films.

[0224] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0225] In some embodiments, please refer to Figures 2 to 6 At least two flexible elements 31 include a hot-pressed region 34. The hot-pressed region 34 is configured such that at least two flexible elements 31 are formed by hot pressing. The hot-pressed region 34 divides the heat exchange assembly 30 to form at least one medium flow channel 32.

[0226] Here, the flexible component 31 is sealed by hot pressing. The hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0227] In this embodiment, the flexible component 31 is sealed by a hot pressing process, that is, a hot pressing region 34 is formed by hot pressing. The hot pressing region 34 divides the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0228] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, which are stacked sequentially.

[0229] Here, the flexible component 31 includes a metal layer and a non-metal layer, that is, a composite material component composed of a metal layer and a non-metal layer.

[0230] For example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0231] Here, there is no limit to the number of metal layers and non-metal layers.

[0232] In this embodiment, the flexible element 31, which is composed of sequentially stacked metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel 32 between at least two flexible elements 31, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly 30. In addition, the heat exchange assembly 30 does not react with the internally flowing heat exchange medium, therefore there is no risk of corrosion or leakage.

[0233] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0234] By setting the metal layer to one or more of aluminum foil, copper foil, and steel foil, the flexible component 31 can have a certain structural strength and can play an isolation role.

[0235] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0236] By setting the non-metallic layer to one or more of polypropylene, polyvinyl chloride and polyethylene, the flexible component 31 can have a certain waterproof function.

[0237] For example, a non-metallic layer of corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or additives can be added to the non-metallic layer to make the non-metallic layer resistant to acid and alkali corrosion.

[0238] In some embodiments, the non-metallic layer is a hot-melt layer.

[0239] Here, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metallic layer together through hot melting, which is simple to form and has high production efficiency.

[0240] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer and a waterproof layer arranged sequentially, with the waterproof layer being closer to the medium flow channel 32 than the corrosion-resistant layer.

[0241] Here, the corrosion-resistant layer can be a nylon layer made of nylon material, thus having certain corrosion resistance, such as resistance to acid and alkali corrosion.

[0242] The isolation layer can be a metal layer, which can be one or more of aluminum foil, copper foil and steel foil, so that the flexible part 31 has a certain structural strength and can play an isolation role.

[0243] The waterproof layer can be a non-metallic layer, which can be one or more of polypropylene, polyvinyl chloride and polyethylene, so that the flexible part 31 can have a certain waterproof function.

[0244] In this embodiment, by configuring the flexible component 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, 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 component 30.

[0245] In some embodiments, please refer to Figures 2 to 7 The flexible element 31 includes a hot-pressed region 34. The hot-pressed region 34 is configured such that at least two flexible elements 31 are formed by hot pressing. The hot-pressed region 34 divides the heat exchange unit 37 to form at least one medium flow channel 32.

[0246] Here, the flexible component 31 is sealed by hot pressing. The hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0247] In this embodiment, the flexible component 31 is sealed by a hot pressing process, that is, a hot pressing region 34 is formed by hot pressing. The hot pressing region 34 divides the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0248] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0249] The thickness of the isolation layer can be any one of the following values ​​or any value between two of the following: 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, and 100μm.

[0250] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-100μm, the flexible component 31 can have a certain structural strength and flexibility.

[0251] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0252] The thickness of the isolation layer can be any one of the following values, or any value between two of the following: 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, and 15μm.

[0253] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-15μm, the flexible component 31 can be further made to have a certain structural strength and flexibility.

[0254] In some embodiments, the thickness of the corrosion-resistant layer is 5μm-20μm.

[0255] 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. Point values ​​of any one of the following: 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, and 20μm, or point values ​​between any two.

[0256] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5μm-20μm, the wear resistance and toughness of the flexible component 31 can be improved.

[0257] In some embodiments, the thickness of the waterproof layer is 50μm-120μm.

[0258] The thickness of the waterproof layer can be any one of the following values ​​or any combination of two: 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, and 120μm.

[0259] In this embodiment, by setting the thickness of the waterproof layer to 50μm-120μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate the hot pressing connection of the flexible component 31 through the waterproof layer.

[0260] In some embodiments, the thickness of the flexible element 31 is 0.05mm-0.3mm.

[0261] 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.

[0262] In this embodiment, by setting the thickness of the flexible element 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible element 31 has a certain structural strength while the overall thickness of the heat exchange component 30 is small, which is beneficial to reduce the overall volume and weight of the battery device 100 and increase the energy density of the battery device 100.

[0263] In some embodiments, the thickness of the flexible element 31 is 0.08 mm to 0.2 mm.

[0264] 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.

[0265] In this embodiment, by setting the thickness of the flexible element 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible element 31 has a certain structural strength, while further reducing the overall thickness of the heat exchange component 30. This is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0266] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0267] For example, the elastic modulus of the flexible component 31 can be any one of 0.1MPa, 1MPa, 50MPa, 100MPa, 150MPa, 200MPa, 300MPa, 500MPa, 800MPa, 1000MPa, 1300MPa, 1500MPa, 1800MPa, 2000MPa, 2500MPa, 2800MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, 6500MPa, 7000MPa, 7500MPa, 8000MPa, 8500MPa, 8800MPa, 9000MPa, 9500MPa, 9700MPa, and 10000MPa, or a value between any two.

[0268] The elastic modulus describes the magnitude of a unit strain caused by a unit stress when a solid is subjected to force within a certain range; it is one of the fundamental physical quantities of materials. The larger the elastic modulus, the greater the stiffness and compressive strength of the material. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0269] In this embodiment, by setting the elastic modulus of the flexible component 31 to 0.1MPa-10000MPa, the flexible component 31 is made to have a certain structural strength, which improves the reliability of the heat exchange component 30, and also has a certain deformation capability. This can improve the fit between the heat exchange component 30 and the housing 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 housing 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.

[0270] In some embodiments, in the second state, the medium flow channel 32 is filled with a heat-insulating medium, the thermal conductivity of which is less than that of the heat exchange medium.

[0271] Here, the thermal conductivity of the insulation medium is less than that of the heat exchange medium. Therefore, in the second state, it is beneficial to improve the heating efficiency of the battery device 100 by enabling the heating device to heat the battery device 100 quickly.

[0272] In addition, if the battery cell assembly 10 is in a low-temperature static state, and the medium flow channel 32 is filled with a heat-insulating medium, it will help to improve the heat loss of the battery device 100 through the heat exchange assembly 30 to a certain extent, thereby improving the heat insulation effect of the battery device 100.

[0273] It should be noted that there are no restrictions on the specific type of insulation medium used.

[0274] For example, the insulating medium is air.

[0275] In other words, in the second state, the heat exchange medium in the medium flow channel 32 can be discharged and air can be introduced to achieve heat insulation of the battery device 100 and achieve a heat preservation effect.

[0276] The insulating medium can be air, a liquid with low thermal conductivity, or other media.

[0277] In some embodiments, please refer to Figure 8 and Figure 9 The heat exchange assembly 30 also includes a first switching valve 37. The first switching valve 37 is disposed at the outlet 36 and is used to selectively open or close the outlet 36.

[0278] Here, the first switching valve 37 is, for example, a stop valve.

[0279] In this embodiment, a first switching valve 37 is provided at the outlet 36 to selectively open or close the outlet 36. Thus, by controlling the first switching valve 37, the heat exchange medium and / or insulation medium can be discharged, or the heat exchange medium and / or insulation medium can be filled.

[0280] In some embodiments, please refer to Figure 9 The heat exchange assembly 30 also includes a first switching valve 37, a second switching valve, and a three-way valve 38. The first switching valve 37 is located at the outlet 36 and is used to selectively open or close the outlet. The second switching valve is located 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.

[0281] The heat exchange medium in the medium flow channel 32 can be discharged by controlling the outlet 36 to open, the second branch 382 to close, and the third branch 383 to open. The heat insulation medium source can be controlled to fill the medium flow channel 32 with heat insulation medium. The outlet 36 and the third branch 383 can be controlled to close, so as to achieve the discharge of heat exchange medium and the filling of heat insulation medium.

[0282] Of course, it is also possible to control the outlet 36 to open, control the second branch 382 to close, control the third branch 383 to open, control the insulation medium source to fill the insulation medium into the medium flow channel 32 and discharge the heat exchange medium in the medium flow channel 32, control the outlet 36 to close, and control the third branch 383 to close, so as to discharge the heat exchange medium and fill the insulation medium.

[0283] In this embodiment, the cooperation of the first switching valve 37, the second switching valve, and the three-way valve 38 can realize the discharge of heat exchange medium and / or heat insulation medium, or the filling of heat exchange medium and / or heat insulation medium.

[0284] In some embodiments, the heat exchange assembly 30 further includes a storage element. The storage element is used to store the heat exchange medium discharged from the medium flow channel 32.

[0285] Here, the specific type of storage device is not limited. The storage device is a container with a certain volume, used to store the heat exchange medium discharged from the medium flow channel 32.

[0286] This application provides a method for controlling a battery device. For example... Figures 1 to 9 As shown, the battery device 100 includes a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30.

[0287] Figure 10 A flowchart of a control method for a battery device provided in an embodiment of this application is shown below. Figure 10 As shown, the control method for the battery device includes the following steps S101 to S102:

[0288] Step S101: In the first state, the control medium flow channel is filled with heat exchange medium; wherein, the first state is a cooling state in which the battery cell assembly is cooled by the heat exchange component.

[0289] For example, the heat exchange assembly 30 includes at least two flexible members 31, which are stacked and at least one medium flow channel 32 is formed between the flexible members 31. The at least one medium flow channel 32 is used to conduct heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0290] The heat exchange assembly 30 includes at least two flexible elements 31, meaning that the number of flexible elements 31 included in the heat exchange assembly 30 can be two or more.

[0291] Here, the flexible component 31 is configured as a flexible structure, meaning that it is made of a material that can be extruded and deformed, so that it has good tensile strength, water impermeability, and elongation at break. The flexible component 31, being a flexible structure, has certain expandable or contractile characteristics, which allows the heat exchange assembly 30 to be formed into a contoured structure, improving the fit between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10.

[0292] The heat exchange assembly 30 includes at least two flexible elements 31, meaning that the number of flexible elements 31 included in the heat exchange assembly 30 can be two or more.

[0293] Here, the flexible component 31 is relatively lightweight, which helps to reduce the weight of the heat exchange assembly 30.

[0294] At least one medium flow channel 32 is formed between at least two flexible members 31, meaning that the heat exchange assembly 30 forms a medium flow channel 32 between the flexible members 31. The heat exchange medium flows within the medium flow channel 32 to exchange heat with the battery cell assembly 10.

[0295] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a cooling effect on the battery cell 11, such as being gaseous or liquid. In this embodiment, water is used as an example for description.

[0296] In addition, the flexible component 31 of the flexible structure is more conducive to discharging the heat exchange medium in the medium flow channel 32.

[0297] It should be noted that the flexible component 31 can have conductive properties, which is beneficial for equipotential setting; the flexible component 31 can also have electrical insulation properties, eliminating the need for insulation treatment, which helps reduce the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0298] In the first state, the medium flow channel 32 is filled with heat exchange medium, and the heat exchange component 30 is used to cool the battery cell assembly 10. In other words, the battery device 100 is in a cooling state at this time.

[0299] In some embodiments, at least two flexible elements 31 are configured as metal plasticized films.

[0300] The flexible component 31 is a single-layer or multi-layer thin film.

[0301] Here, the metal plastic film is a metal-plastic composite material, which includes a metal layer and a plastic layer.

[0302] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel 32 is formed between at least two metal plasticized films, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly 30 can be reduced. Simultaneously, because the heat exchange assembly 30 has insulating properties, the risk of insulation failure can be avoided. The heat exchange assembly 30 also does not react with the internally flowing heat exchange medium, thus eliminating the risk of corrosion and leakage.

[0303] For example, at least two flexible elements 31 are configured as aluminum-plastic films.

[0304] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0305] In some embodiments, see Figures 2 to 6 At least two flexible elements 31 include a hot-pressed region 34. The hot-pressed region 34 is configured such that at least two flexible elements 31 are formed by hot pressing. The hot-pressed region 34 divides the heat exchange assembly 30 to form at least one medium flow channel 32.

[0306] Here, the flexible component 31 is sealed by hot pressing. The hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0307] In this embodiment, the flexible component 31 is sealed by a hot pressing process, that is, a hot pressing region 34 is formed by hot pressing. The hot pressing region 34 divides the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0308] In step S102, in the second state, the heat exchange medium in the medium flow channel is discharged, and the outlet and inlet are closed.

[0309] In the second state, by discharging the heat exchange medium in 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 improving the situation where the leaked heat exchange medium slowly seeps into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100.

[0310] Here, the second state can refer to any state other than the battery cell assembly 10 being in a cooled state.

[0311] For example, please refer to Figure 5 and Figure 6 The heat exchange component 30 also includes an inlet section 35 and an outlet section 36, with the inlet of the inlet section 35 and the outlet of the outlet section 36 both connected to the medium flow channel 32.

[0312] Here, the inlet 35 and outlet 36 of the heat exchange assembly 30 are used for connecting to the pipeline of the vehicle.

[0313] The heat exchange assembly 30 having at least one medium flow channel 32 means that the number of medium flow channels 32 is one or more.

[0314] The principle of heat exchange component 30 for heat dissipation of battery cell assembly 10 is as follows: the heat exchange medium output from the cold source enters the medium flow through the inlet 35 of the heat exchange component 30, absorbs the heat generated during the operation of battery cell assembly 10, and then flows out through the outlet 36 of the heat exchange component 30 to release the heat, thus completing the cooling and heat dissipation of battery cell assembly 10.

[0315] The flexible component 31 is configured as a flexible structure with certain expandable or contractible characteristics, thereby forming the heat exchange component 30 into a contoured structure, improving the fit between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10.

[0316] The control method for the battery device provided in this application embodiment includes a battery device 100 comprising a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The battery cell assembly 10 is disposed within the first receiving cavity 23 of the housing assembly 20, and the housing assembly 20 provides protection for 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 element 31, which is lightweight and helps to reduce the weight of the battery device 100, reduce the production cost of the heat exchange component 30, and improve the energy density of the battery device 100. On the other hand, by setting the flexible element 31 as a flexible structure, the heat exchange component 30 can fit better with the housing assembly 20 and / or the battery cell assembly 10, thereby absorbing the assembly tolerance of the heat exchange component 30, eliminating the need for sealant or thermal conductive material, improving the fit between the heat exchange component 30 and the housing assembly 20 and / or the battery cell assembly 10, increasing the effective heat exchange area between the heat exchange component 30 and the housing assembly 20 and / or the battery cell assembly 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0317] Furthermore, the battery device 100 includes a first state and a second state. In the first state, i.e., the cooling state, heat exchange medium is filled in the medium flow channel 32 of the heat exchange component 30 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, so that the medium flow channel 32 is not filled with heat exchange medium, and the outlet 36 and the inlet 35 are closed. This can improve the situation of heat exchange medium leakage, thereby improving the situation where leaked heat exchange medium slowly seeps into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100; it can also improve the heating efficiency and heat preservation effect of the battery device 100.

[0318] In some embodiments, the second state includes states other than the battery cell assembly 10 being in a cooled state.

[0319] In other words, the heat exchange medium in the medium flow channel 32 can be discharged in any state other than when the battery cell assembly 10 is in a cooled state.

[0320] In some embodiments, the second state includes a heating state in which the battery cell assembly 10 is heated.

[0321] Understandably, when the battery cell assembly 10 is under heating, if the medium flow channel 32 is filled with heat exchange medium, some heat will be carried away by the heat exchange medium during the heating of the battery device 100, 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 the absorption of heat by the heat exchange medium and thus improving the heating efficiency of the battery device 100.

[0322] Here, the heating device is, for example, a heating film.

[0323] For example, the second state includes the battery cell assembly 10 being in a stationary state of the battery device 100.

[0324] It is understandable that when the battery cell assembly 10 is in a static state, i.e., when the battery cell assembly 10 does not require cooling or heat dissipation, if the medium flow channel 32 is filled with heat exchange medium, micro-leakage may occur. The leaked heat exchange medium can slowly seep into the battery device 100, potentially causing 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, thus eliminating the presence of heat exchange medium in the medium flow channel 32, the leakage of heat exchange medium can be mitigated, thereby reducing the risk of the leaked heat exchange medium slowly seeping into the battery device 100, causing insulation failure, or even a short circuit and fire in the battery device 100.

[0325] Furthermore, if the battery cell assembly 10 is in a low-temperature static state, and if the medium flow channel 32 is filled with heat exchange medium, a large amount of heat at the bottom of the battery device 100 will be lost through the heat exchange medium, resulting in poor heat preservation. 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 heat preservation effect of the battery device 100 is improved.

[0326] In some embodiments, after the heat exchange medium in the medium flow channel 32 is discharged, the control method further includes:

[0327] The medium flow channel 32 is filled with a heat-insulating medium, and the thermal conductivity of the heat-insulating medium is less than that of the heat exchange medium.

[0328] Here, the thermal conductivity of the insulation medium is less than that of the heat exchange medium. Therefore, in the second state, it is beneficial to improve the heating efficiency of the battery device 100 by enabling the heating device to heat the battery device 100 quickly.

[0329] In addition, if the battery cell assembly 10 is in a low-temperature static state, and the medium flow channel 32 is filled with a heat-insulating medium, it will help to improve the heat loss of the battery device 100 through the heat exchange assembly 30 to a certain extent, thereby improving the heat insulation effect of the battery device 100.

[0330] It should be noted that there are no restrictions on the specific type of insulation medium used.

[0331] In some embodiments, the insulating medium is air.

[0332] In other words, in the second state, the heat exchange medium in the medium flow channel 32 can be discharged and air can be introduced to achieve heat insulation of the battery device 100 and achieve a heat preservation effect.

[0333] In some embodiments, please refer to Figure 8 and Figure 9 The heat exchange assembly 30 also includes a first switching valve 37, which is disposed at the outlet 36 and is used to selectively open or close the outlet 36; the step of discharging the heat exchange medium in the medium flow channel 32 includes:

[0334] Control the inlet section 35 to close, and control the outlet section 36 to open;

[0335] Extract the heat exchange medium from the medium flow channel 32;

[0336] After the heat exchange medium is completely evacuated, control outlet 36 is closed.

[0337] Here, the first switching valve 37 is, for example, a stop valve.

[0338] In this embodiment, a first switching valve 37 is provided at the outlet 36 to selectively open or close the outlet 36. Thus, by controlling the inlet 35 to close and the outlet 36 to open, the heat exchange medium in the medium flow channel 32 can be extracted. After the heat exchange medium is extracted, the outlet 36 is closed to discharge the heat exchange medium.

[0339] In some embodiments, please refer to Figure 9 The heat exchange assembly 30 also includes a first switching valve 37, a second switching valve, and a three-way valve 38. The first switching valve 37 is located at the outlet 36 and is used to selectively open or close 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:

[0340] Control the exit section 36 to open, control the second branch 382 to close, and control the third branch 383 to open;

[0341] The heat exchange medium in the medium flow channel 32 is discharged, and the heat insulation medium source is controlled to fill the heat insulation medium into the medium flow channel 32;

[0342] Control exit section 36 to close, control third branch road 383 to close.

[0343] The heat exchange medium in the medium flow channel 32 can be discharged by controlling the outlet 36 to open, the second branch 382 to close, and the third branch 383 to open. The heat insulation medium source can be controlled to fill the medium flow channel 32 with heat insulation medium. The outlet 36 and the third branch 383 can be controlled to close, so as to achieve the discharge of heat exchange medium and the filling of heat insulation medium.

[0344] Of course, it is also possible to control the outlet 36 to open, control the second branch 382 to close, control the third branch 383 to open, control the insulation medium source to fill the insulation medium into the medium flow channel 32 and discharge the heat exchange medium in the medium flow channel 32, control the outlet 36 to close, and control the third branch 383 to close, so as to discharge the heat exchange medium and fill the insulation medium.

[0345] In this embodiment, the cooperation of the first switching valve 37 and the three-way valve 38 can realize the discharge of heat exchange medium and / or heat insulation medium, or the filling of heat exchange medium and / or heat insulation medium.

[0346] In some embodiments, the heat exchange assembly 30 further includes a storage element for storing heat exchange medium discharged from the medium flow channel 32.

[0347] Here, the specific type of storage device is not limited. The storage device is a container with a certain volume, used to store the heat exchange medium discharged from the medium flow channel 32.

[0348] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0349] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A control method for a battery device, characterized in that, The battery device includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed inside the housing assembly. The heat exchange assembly is provided with an inlet, an outlet, and at least one medium flow channel. The medium flow channel connects the inlet of the inlet and the outlet of the outlet. The battery device includes a first state and a second state distinct from the first state, and the control method includes: In the first state, the medium flow channel is controlled to be filled with heat exchange medium; wherein, the first state is a cooling state in which the battery cell assembly is cooled by the heat exchange component. In the second state, the heat exchange medium in the medium flow channel is discharged, and the outlet and the inlet are closed.

2. The control method according to claim 1, characterized in that, The second state includes any state other than the battery cell assembly being in a cooled state.

3. The control method according to claim 1, characterized in that, The second state includes a heating state in which the battery cell assembly is heated; and / or, The second state includes the battery cell assembly being in the static state of the battery device.

4. The control method according to claim 1, characterized in that, After the heat exchange medium in the medium flow channel is discharged, the control method further includes: The medium is filled with a heat-insulating medium, the thermal conductivity of which is lower than that of the heat exchange medium.

5. The control method according to claim 4, characterized in that, The insulating medium is air.

6. The control method according to claim 1, characterized in that, The heat exchange assembly includes at least two flexible elements, which are stacked together, and at least one medium flow channel is formed between the flexible elements.

7. The control method according to claim 4, characterized in that, The heat exchange assembly further includes a first switching valve, a second switching valve, and a three-way valve. The first switching valve is disposed at the outlet and is used to selectively open or close the outlet. The second switching valve is disposed at the inlet and is used to selectively open or close 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 heat insulation medium source. The step of discharging the heat exchange medium from the medium flow channel includes: Control the outlet to open, control the second branch to close, and control the third branch to open; The heat exchange medium in the medium flow channel is discharged, and the heat insulation medium source is controlled to fill the heat insulation medium into the medium flow channel; Control the outlet to close, and control the third branch to close.

8. The control method according to claim 1, characterized in that, The heat exchange assembly further includes a storage unit for storing the heat exchange medium discharged from the medium flow channel.

9. A battery device, characterized in that, include: Enclosure assembly; A battery cell assembly is disposed within the housing assembly; A heat exchange assembly is used to exchange heat with the battery cell assembly; wherein the heat exchange assembly includes an inlet, an outlet 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 and the outlet of the outlet are both connected to 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.

10. The battery device according to claim 9, characterized in that, In the second state, the medium flow channel is filled with a heat-insulating medium, the thermal conductivity of which is lower than that of the heat exchange medium.

11. The battery device according to claim 10, characterized in that, The insulating medium is air.

12. The battery device according to claim 10, characterized in that, The heat exchange assembly further includes a first switching valve, a second switching valve, and a three-way valve. The first switching valve is located at the outlet and is used to selectively open or close the outlet. The second switching valve is located at the inlet and is used to selectively open or close 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 heat insulation medium source.

13. The battery device according to claim 9, characterized in that, The heat exchange assembly further includes a storage unit for storing the heat exchange medium discharged from the medium flow channel.

14. The battery device according to claim 9, characterized in that, The at least two flexible components are configured as metal plasticized films.

15. The battery device according to claim 14, characterized in that, The at least two flexible components are configured as aluminum-plastic films.

16. The battery device according to claim 9, characterized in that, The flexible component has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

17. The battery device according to claim 16, characterized in that, The metal layer includes one or more of aluminum foil, copper foil, and steel foil.

18. The battery device according to claim 16, characterized in that, The non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

19. The battery device according to claim 16, characterized in that, The non-metallic layer is a hot-melt layer.

20. The battery device according to claim 9, characterized in that, The flexible component has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, wherein the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

21. The battery device according to claim 20, characterized in that, The thickness of the isolation layer is 6.5μm-100μm.

22. The battery device according to claim 21, characterized in that, The thickness of the isolation layer is 6.5μm-15μm.

23. The battery device according to claim 20, characterized in that, The thickness of the corrosion-resistant layer is 5μm-20μm.

24. The battery device according to claim 20, characterized in that, The thickness of the waterproof layer is 50μm-120μm.

25. The battery device according to claim 9, characterized in that, The thickness of the flexible component is 0.05mm-0.3mm.

26. The battery device according to claim 25, characterized in that, The thickness of the flexible component is 0.08mm-0.2mm.

27. The battery device according to claim 9, characterized in that, The elastic modulus of the flexible component is 0.1 MPa-10000 MPa.

28. The battery device according to claim 9, characterized in that, The at least two flexible elements include a hot-pressed region, which is configured such that the at least two flexible elements are formed by hot pressing, and the hot-pressed region divides the heat exchange assembly to form the at least one medium flow channel.

29. 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 9-28, and the heat exchange component is used to exchange heat with the battery cell assembly.

30. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 9-28 or the heat exchange assembly according to claim 29.

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