Heat exchange unit, battery device, electric equipment and energy storage equipment

Abstract

The embodiment of the utility model provides a heat exchange unit, a battery device, electric equipment and energy storage equipment. The battery device comprises a box body assembly, a battery monomer assembly, a heat exchange unit and an adjusting assembly, a first containing cavity is formed in the box body assembly. And the battery monomer assembly is arranged in the first accommodating cavity. And the heat exchange unit is used for exchanging heat with the battery monomer assembly. The heat exchange unit comprises a flexible heat exchange unit, the flexible heat exchange unit is provided with at least one flexible flow channel part, and the flexible flow channel part forms a heat exchange flow channel. The adjusting assembly extrudes the flexible flow channel part so as to adjust the flow channel section area of at least one heat exchange flow channel. The battery device provided by the embodiment of the utility model is beneficial to improving the fitting degree of the heat exchange unit and the box body assembly and / or the battery monomer assembly, so that the heat exchange efficiency and the heat exchange effect of the heat exchange unit are improved. And the flow channel section area of at least one heat exchange flow channel can be adjusted, so that the heat management performance and the temperature uniformity of the battery device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a heat exchange unit, a battery device, an electrical device, and an energy storage device. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

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

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

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

[0006] The box assembly has a first accommodating cavity therein;

[0007] A battery cell assembly is disposed in the first accommodating cavity;

[0008] a heat exchange unit, the heat exchange unit being configured to exchange heat with the battery cell assembly; the heat exchange unit comprising a flexible heat exchange unit having at least one flexible flow channel portion, the flexible flow channel portion forming a heat exchange flow channel;

[0009] An adjusting component is provided, wherein the adjusting component squeezes the flexible flow channel portion to adjust the flow channel cross-sectional area of at least one of the heat exchange flow channels.

[0010] The battery device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, a heat exchange unit, and a regulating assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange unit is used to exchange heat with the battery cell assembly. On the one hand, the heat exchange unit includes a flexible heat exchange unit made of a flexible member. The flexible member is lightweight, which helps reduce the weight of the battery device, reduces the production cost of the heat exchange unit, and helps improve the energy density of the battery device. On the other hand, by configuring the flexible member as a flexible structure, the heat exchange unit can be better fitted with the housing assembly and / or the battery cell assembly, thereby absorbing the assembly tolerance of the heat exchange unit. This eliminates the need for caulking agent or thermally conductive material, improves the fit between the heat exchange unit and the housing assembly and / or the battery cell assembly, and increases the effective heat exchange area between the heat exchange unit and the housing assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0011] In addition, by setting up an adjustment component, the adjustment component can adjust the cross-sectional area of the flow channel of at least one heat exchange flow channel by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel can be adjusted accordingly according to the temperature difference of different areas of the battery device, or according to the temperature difference of different states of the battery device, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit, and then improving the thermal management performance and temperature uniformity of the battery device.

[0012] In some embodiments, the battery device further includes a regulating component, which is disposed in the heat exchange unit and is used to control the size of a flow cross-sectional area of at least one of the heat exchange channels.

[0013] Therefore, the size of the flow cross-sectional area of the heat exchange flow channel in the corresponding area can be dynamically adjusted according to the temperature changes in different areas of the battery device, thereby achieving the effect of dynamically distributing the flow of the heat exchange medium, which is beneficial to improving the heat dissipation performance of the high-temperature area of the battery device and further improving the thermal management performance and temperature uniformity of the battery device.

[0014] In some embodiments, the regulating assembly includes at least two control members, each of the control members corresponds to a different heat exchange channel, and the at least two control members can compress the heat exchange channel by moving.

[0015] Since the flexible member is a flexible structure, the flow cross-sectional area of each heat exchange channel can be controlled by controlling the control member to be close to or away from each heat exchange channel.

[0016] In some embodiments, the adjustment assembly further includes a connecting member, one end of each of the control members is connected to the connecting member, the free end of each of the control members is used to compress the heat exchange channel, and the distance between the free end of at least one of the control members and the connecting member is different from the distance between the free end of the other control members and the connecting member.

[0017] By setting the heights of each control component to be different, that is, by controlling the connecting component to be close to or away from the heat exchange unit, fixed differential control of each heat exchange channel by each control component can be achieved. The movement and control methods of the adjustment component are simple and reliable.

[0018] In some embodiments, the regulating component further includes a signal acquisition device and a regulating structure, wherein the signal acquisition device is used to collect temperature information of different areas of the battery cell assembly, and the regulating structure is used to control the compression amount of the heat exchange channel by the control component based on the temperature information.

[0019] In this embodiment, a signal acquisition device and an adjustment structure are provided to collect temperature information of different areas of the battery cell assembly through the signal acquisition device. The adjustment structure is used to control the compression amount of the heat exchange flow channel of the control component according to the temperature information. That is, the size of the flow cross-sectional area of the heat exchange flow channel in the corresponding area can be dynamically adjusted according to the temperature changes in different areas of the battery device, thereby further improving the accuracy of the temperature adjustment of the battery device.

[0020] In some embodiments, the regulating assembly includes a thermostat, which is arranged between the battery cell assembly and the heat exchange unit, and the arrangement direction of the battery cell assembly, the thermostat and the heat exchange unit is limited to a first direction; when the temperature of the battery cell assembly rises, the thermostat absorbs heat and expands in a direction perpendicular to the first direction and contracts along the first direction, and the compression amount of the heat exchange channel by the thermostat is reduced.

[0021] In this embodiment, by providing a thermostat, when the temperature of the battery cell assembly rises, the thermostat absorbs heat and expands in a direction perpendicular to the first direction and contracts along the first direction. In this way, the size of the thermostat in the first direction can be reduced, thereby reducing the compression amount of the heat exchange channel by the thermostat. The flow cross-sectional area of the heat exchange channel corresponding to this area is increased, which is conducive to improving the heat dissipation of this area, thereby realizing automatic control of the flow cross-sectional area size of the heat exchange channel.

[0022] In some embodiments, the width of at least one of the heat exchange channels is different from the width of the other heat exchange channels.

[0023] In this embodiment, the width of the heat exchange channel can be designed to be different according to the heat dissipation requirements of different areas of the battery device. For example, the width of the heat exchange channel corresponding to the high-temperature area of the battery device is generally larger, and the width of the heat exchange channel corresponding to the low-temperature area of the battery device is smaller. According to the temperature changes in different areas of the battery device, the flow of the heat exchange medium is distributed, the overall temperature of the battery device is accurately adjusted, the heat exchange efficiency and heat exchange effect of the heat exchange unit are improved, and the thermal management performance and temperature uniformity of the battery device are thereby improved.

[0024] In some embodiments, the flexible heat exchange unit includes at least two flexible parts, which are stacked and at least one heat exchange channel is formed between the flexible parts. The at least one heat exchange channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

[0025] In this embodiment, the heat exchange unit is provided with a flexible heat exchange unit. The flexible heat exchange unit is made of a flexible part. The flexible part is light in weight, which is beneficial to reducing the weight of the battery device, reducing the production cost of the heat exchange unit, and improving the energy density of the battery device. On the other hand, by setting the flexible part as a flexible structure, the flexible part is thin and flexible, and the flexible heat exchange unit has better bendability, so that it can be bent toward the adjacent heat exchange unit as needed, so that it can be close to and connected to the adjacent heat exchange unit, to a certain extent, facilitating the connection between the heat exchange units and reducing the occupied space. On the other hand, the heat exchange unit can be better fitted with the box assembly and / or the battery cell assembly, which is beneficial to absorbing the assembly tolerance of the heat exchange unit, without the need to use filler or thermal conductive material, improving the fit between the heat exchange unit and the box assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange unit and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0026] In some embodiments, the at least two flexible members are configured as metal plasticized films.

[0027] In this embodiment, the thin and lightweight metal-plasticized films, combined with the heat exchange channel formed between at least two of the films, are unaffected by the extrusion process and eliminate the need for high thickness requirements. This reduces the overall thickness and weight of the heat exchange unit. Furthermore, the heat exchange unit does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0028] In some embodiments, the at least two flexible members are configured as aluminum-plastic films.

[0029] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0030] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

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

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

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

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

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

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

[0037] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

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

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

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

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

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

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

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

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

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

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

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

[0049] By setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange unit made of the flexible part has a certain structural strength while the overall thickness of the heat exchange unit is smaller, which is beneficial to reducing the overall volume and weight of the battery to increase the energy density of the battery.

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

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

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

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

[0054] In some embodiments, the at least two flexible members include a hot pressing region, wherein the hot pressing region is configured such that the at least two flexible members are formed by hot pressing, and the hot pressing region separates the heat exchange unit to form the at least one heat exchange channel.

[0055] In this embodiment, the flexible member is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the heat exchange unit to form at least one heat exchange channel. This molding method is simple.

[0056] A second aspect of an embodiment of the present application provides a heat exchange unit, which is the heat exchange unit of the battery device described above, and is used to exchange heat with the battery cell assembly.

[0057] The heat exchange unit provided in the embodiment of the present application is arranged in the box assembly and is used to exchange heat with the battery cell assembly. On the one hand, the heat exchange unit includes a flexible heat exchange unit, which is made of flexible parts. The flexible parts are relatively light in weight, which is beneficial to reducing the weight of the battery device, reducing the production cost of the heat exchange unit, and improving the energy density of the battery device; on the other hand, by setting the flexible parts as a flexible structure, the heat exchange unit can be better fitted with the box assembly and / or the battery cell assembly, which is beneficial to absorbing the assembly tolerance of the heat exchange unit, without the need to use filler or thermal conductive material, thereby improving the fit between the heat exchange unit and the box assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange unit and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0058] In addition, by setting up an adjustment component, the adjustment component can adjust the cross-sectional area of the flow channel of at least one heat exchange flow channel by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel can be adjusted accordingly according to the temperature difference of different areas of the battery device, or according to the temperature difference of different states of the battery device, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit, and then improving the thermal management performance and temperature uniformity of the battery device.

[0059] A third aspect of an embodiment of the present application provides an electrical device, comprising the battery device or the heat exchange unit described above.

[0060] The battery device of an electrical device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, a heat exchange unit, and a regulating assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange unit is also disposed in the housing assembly and is used to exchange heat with the battery cell assembly. On the one hand, the heat exchange unit includes a flexible heat exchange unit made of a flexible member. The flexible member is lightweight, which helps reduce the weight of the battery device, reduces the production cost of the heat exchange unit, and helps improve the energy density of the battery device. On the other hand, by configuring the flexible member as a flexible structure, the heat exchange unit can be better fitted with the housing assembly and / or the battery cell assembly, thereby absorbing assembly tolerances of the heat exchange unit, eliminating the need for caulking agents or thermally conductive materials, improving the fit between the heat exchange unit and the housing assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange unit and the housing assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0061] In addition, by setting up an adjustment component, the adjustment component can adjust the cross-sectional area of the flow channel of at least one heat exchange flow channel by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel can be adjusted accordingly according to the temperature difference of different areas of the battery device, or according to the temperature difference of different states of the battery device, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit, and then improving the thermal management performance and temperature uniformity of the battery device.

[0062] A fourth aspect of an embodiment of the present application provides an energy storage device, comprising the battery device described above or the heat exchange unit described above.

[0063] The battery device of the energy storage device provided in the embodiment of the present application includes a housing assembly, a battery cell assembly, a heat exchange unit, and a regulating assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange unit is also disposed in the housing assembly for exchanging heat with the battery cell assembly. On the one hand, the heat exchange unit includes a flexible heat exchange unit, which is made of a flexible member. The flexible member is lightweight, which helps to reduce the weight of the battery device, reduce the production cost of the heat exchange unit, and improve the energy density of the battery device. On the other hand, by configuring the flexible member as a flexible structure, the heat exchange unit can be better fitted with the housing assembly and / or the battery cell assembly, thereby absorbing the assembly tolerance of the heat exchange unit, eliminating the need for caulking agent or thermal conductive material, improving the fit between the heat exchange unit and the housing assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange unit and the housing assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0064] In addition, by setting up an adjustment component, the adjustment component can adjust the cross-sectional area of the flow channel of at least one heat exchange flow channel by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel can be adjusted accordingly according to the temperature difference of different areas of the battery device, or according to the temperature difference of different states of the battery device, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit, and then improving the thermal management performance and temperature uniformity of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0066] Figure 2 This is a schematic exploded perspective view of a battery device according to an embodiment of the present application, wherein the heat exchange unit is disposed in the second accommodation chamber;

[0067] Figure 3 A cross-sectional view of a battery device provided in one embodiment of the present application;

[0068] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0069] Figure 5 A schematic diagram of the connection structure between the heat exchange unit and the bottom guard plate provided in one embodiment of the present application;

[0070] Figure 6 A schematic structural diagram of a heat exchange unit provided in one embodiment of the present application;

[0071] Figure 7 A schematic structural diagram of a bottom guard plate provided in one embodiment of the present application;

[0072] Figure 8 This is a schematic exploded perspective view of a battery device according to another embodiment of the present application, wherein the heat exchange unit is disposed in the first accommodation chamber;

[0073] Figure 9 A schematic diagram of the structure of an adjustment component provided in one embodiment of the present application;

[0074] Figure 10 A schematic structural diagram of an adjustment component provided in another embodiment of the present application, wherein the adjustment component includes a temperature controller;

[0075] Figure 11 for Figure 10 The schematic diagram of the structure of the regulating component after absorbing heat is shown.

[0076] Description of Reference Numerals

[0077] 10. Battery cell assembly; 11. Battery cell; 20. Box assembly; 21. Box body; 211. First box body portion; 212. Second box body portion; 22. Bottom guard plate; 221. Connecting portion; 222. Limiting structure; 23. First accommodating cavity; 24. Second accommodating cavity; 30. Heat exchange unit; 31. Flexible part; 32. Heat exchange flow channel; 33. Avoidance hole; 34. Hot pressing area; 35. Inlet; 36. Outlet; 40. Adjustment assembly; 41. Connecting part; 42. Control part; 43. Thermostat; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0078] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0079] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0080] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0081] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0082] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0083] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0084] 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.

[0085] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0086] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0088] In some embodiments, a metal foam may be used as the positive electrode. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, the positive electrode active material may be filled and / or deposited within the metal foam.

[0089] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0090] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, or a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] 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.

[0092] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0093] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional 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.

[0094] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0095] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0096] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0097] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0098] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0099] As an example, the primary 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0100] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0101] 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 specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0102] The liquid electrolyte includes an electrolyte salt and a solvent.

[0103] 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0104] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0105] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives capable of improving 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.

[0106] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0107] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0108] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0109] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0110] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0111] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0112] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0113] In some embodiments, the electrode assembly is a laminate structure.

[0114] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0115] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0116] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0117] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0118] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0119] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0120] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0121] In some embodiments, the battery cell may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0122] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0123] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0124] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0125] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0126] Power plants are increasingly demanding higher area energy density for energy storage containers. Consequently, to increase the amount of electricity they can hold, the weight of the containers is also increasing. However, containers must be transported from production sites to their intended destinations by land and / or sea, and these transport methods often have weight restrictions. This creates a conflict between the increased energy density and the weight of the energy storage containers.

[0127] During the use of the battery device, the battery cells in the battery device will generate heat. If this heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate heat from the battery cells of the battery device has become an important research direction in this field. In the related art, a cooling system is provided in the battery device box to cool the battery cells in the battery device. The above-mentioned cooling system may include multiple aluminum water-cooling plates laid in the battery device box, and the surfaces of the multiple water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned multiple water-cooling plates, thereby removing heat from the battery cells and cooling the battery cells. However, when the aluminum water-cooling plates in the above-mentioned cooling system do not fit well with the surfaces of the battery cells in the battery device, the heat exchange efficiency and heat exchange effect are poor. At the same time, when assembling with the battery cell assembly, assembly tolerance compensation and filling of caulking agent are required, and the production cost is high. In addition, the water-cooling plate and battery device box have high rigidity and require the use of hard structural adhesive, which makes disassembly difficult. If self-adhesive, soft or double-sided adhesive is used, the rigidity of the water-cooling plate and battery device box is relatively good, and when there is a gap and flatness mismatch, there will be problems with debonding.

[0128] In view of this, in order to improve the heat exchange efficiency and heat exchange effect of the heat exchange unit, an embodiment of the present application provides a battery device, which includes a housing assembly, a battery cell assembly, a heat exchange unit, and an adjustment assembly. The housing assembly has a first accommodating cavity inside. The battery cell assembly is disposed within the first accommodating cavity. The heat exchange unit is configured to exchange heat with the battery cell assembly. The heat exchange unit includes a flexible heat exchange unit having at least one flexible flow channel portion, which forms a heat exchange flow channel. The adjustment assembly squeezes the flexible flow channel portion to adjust the flow channel cross-sectional area of at least one heat exchange flow channel.

[0129] The battery device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, a heat exchange unit, and a regulating assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange unit is also disposed in the housing assembly and is used to exchange heat with the battery cell assembly. On the one hand, the heat exchange unit includes a flexible heat exchange unit made of a flexible member. The flexible member is lightweight, which helps reduce the weight of the battery device, reduces the production cost of the heat exchange unit, and helps improve the energy density of the battery device. On the other hand, by configuring the flexible member as a flexible structure with a certain degree of deformation, the heat exchange unit can be better fitted and adapted to the housing assembly and / or the battery cell assembly, thereby absorbing assembly tolerances of the heat exchange unit, improving the fit between the heat exchange unit and the housing assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange unit and the housing assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit.

[0130] In addition, by setting up an adjustment component, the adjustment component can adjust the cross-sectional area of the flow channel of at least one heat exchange flow channel by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel can be adjusted accordingly according to the temperature difference of different areas of the battery device, or according to the temperature difference of different states of the battery device, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit, and then improving the thermal management performance and temperature uniformity of the battery device.

[0131] The technical solutions described in the embodiments of this application are applicable to electrical equipment using a battery device. The electrical equipment includes a battery device according to any embodiment of this application, and the battery device is used to provide electrical energy.

[0132] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0133] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including box assemblies and electrical equipment using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0134] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0135] To meet varying power requirements, the battery device includes a battery cell assembly 10, which can include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery device module or battery device pack. Multiple battery cells 11 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within multiple battery cells 11. Multiple battery cells 11 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire assembly of multiple battery cells 11 is housed within a housing assembly 20. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 11 in series, in parallel, or in a hybrid configuration to form a battery device module. Multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing assembly 20. The battery device 100 can also include other structures, such as a busbar assembly to electrically connect the multiple battery cells 11. Each battery cell 11 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device, or a magnesium-ion battery device, but is not limited to these. The battery cell 11 may be cylindrical, flat, rectangular, or in other shapes.

[0136] An embodiment of the present application provides a battery device, which includes a housing assembly 20, a battery cell assembly 10, and a heat exchange unit 30. The housing assembly 20 has a first accommodating chamber 23 therein. The battery cell assembly 10 is disposed within the first accommodating chamber 23. The heat exchange unit 30 is configured to exchange heat with the battery cell assembly 10. The heat exchange unit 30 includes a flexible heat exchange unit having at least one flexible flow channel portion, which forms a heat exchange flow channel 32. The adjustment assembly 40 squeezes the flexible flow channel portion to adjust the flow channel cross-sectional area of at least one heat exchange flow channel.

[0137] Please refer to Figure 2 and Figure 8 The battery device includes a box assembly 20 and a battery cell assembly 10 . The battery cell assembly 10 includes at least one battery cell 11 . The battery cell 11 is disposed in a first accommodating cavity 23 of the box assembly 20 .

[0138] The housing assembly 20 can be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing assembly 20 can be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0139] The box assembly 20 is used to encapsulate the battery cell assembly 10 . The box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell assembly 10 .

[0140] Please refer to Figures 2 to 6 The embodiment of the present application provides a heat exchange unit. The heat exchange unit 30 is the heat exchange unit 30 of the battery device 100 provided in the embodiment of the present application. The heat exchange unit 30 is used to exchange heat with the battery cell assembly 10.

[0141] Here, the heat exchange unit 30 can be arranged in the first accommodating cavity 23, that is, it can be in direct contact with the battery cell assembly 10, or it can be arranged outside the first accommodating cavity 23, transferring heat through the intermediate medium, thereby realizing heat exchange between the heat exchange unit 30 and the battery cell assembly 10.

[0142] The heat exchange unit 30 includes a flexible heat exchange unit, which includes at least two flexible parts 31. The at least two flexible parts 31 are stacked, and at least one heat exchange channel 32 is formed between the flexible parts 31. The at least one heat exchange channel 32 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly 10.

[0143] Here, the flexible member 31 is configured as a flexible structure. That is, the flexible member 31 is made of a material that can be squeezed and deformed, thereby providing the flexible member 31 with good stretchability, water impermeability, and fracture elongation. The flexible member 31 is configured as a flexible structure with certain expandable and contractible properties, thereby forming a contoured structure of the heat exchange unit 30, improving the fit between the heat exchange unit 30 and the housing assembly 20 and / or the battery cell assembly 10, and thereby increasing the effective heat exchange area between the heat exchange unit 30 and the housing assembly 20 and / or the battery cell assembly 10.

[0144] Of course, the heat exchange unit 30 may also include a rigid heat exchange unit.

[0145] That the heat exchange unit 30 includes at least two flexible members 31 means that the number of the flexible members 31 included in the heat exchange unit 30 may be two or more than two.

[0146] Here, the flexibility of the flexible member 31 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its light weight, or a property imparted to the material due to at least one of its thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible member 31 can be selected to be a material that is lighter than conventional structures such as aluminum plates or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of the flexible member 31. By configuring the heat exchange unit 30 in the form of the flexible member 31 in the embodiment of the present disclosure, the weight of the heat exchange unit 30 is reduced.

[0147] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can cool the battery cells 11. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a cooling liquid.

[0148] The flow rates of the heat exchange medium in each heat exchange channel 32 may be adjusted accordingly based on the temperature differences between different areas of the battery device 100 or the temperature differences between different states of the battery device 100 .

[0149] It should be noted that the flow cross section refers to the cross section that is orthogonal to all streamlines of the elemental or total flow, that is, the plane perpendicular to the flow velocity cluster, such as air or liquid flow. When the streamline clusters are non-parallel, the flow cross section is a curved surface; when the streamline clusters are parallel straight lines, the flow cross section is a flat surface.

[0150] For example, please refer to Figure 6 and Figure 7 The heat exchange unit 30 further includes an inlet 35 and an outlet 36 , both of which are in communication with the heat exchange channel 32 .

[0151] Here, the inlet 35 and the outlet 36 of the heat exchange unit 30 are used to be connected to pipelines of the vehicle or electrical equipment.

[0152] The heat exchange unit 30 is formed with at least two heat exchange channels 32 , which means that the number of the heat exchange channels 32 is two or more.

[0153] The principle of heat exchange of the heat exchange unit 30 for the battery cell assembly 10 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the heat exchange flow channel through the inlet 35 of the heat exchange unit 30. After the heat exchange medium exchanges heat with the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange unit 30, completing the heat exchange of the battery cell assembly 10.

[0154] Here, the heat exchange unit 30 exchanging heat with the battery cell assembly 10 may be to dissipate heat from the battery cell assembly 10 or to heat the battery cell assembly 10 .

[0155] The principle of heat dissipation of the battery cell assembly 10 by the heat exchange unit 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the heat exchange flow channel through the inlet 35 of the heat exchange unit 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange unit 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell assembly 10.

[0156] The principle of the heat exchange unit 30 heating the battery cell assembly 10 is as follows: the heat exchange medium output by the heat exchange source enters the heat exchange flow channel through the inlet 35 of the heat exchange unit 30, and the heat exchange medium transfers heat to the battery cell assembly 10. After heating the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange unit 30, completing the heating of the battery cell assembly 10.

[0157] The flexible part 31 is set as a flexible structure, and the flexible part 31 has certain expandable or contractible characteristics. It can also be understood that the flexible part 31 can be an elastically deformable structure. The flexible part 31 has the ability to deform and restore deformation, so that the heat exchange unit 30 can be formed into a contoured structure. The heat exchange unit 30 can better adapt to the external contour shape of the battery cell or other components to improve the fit between the heat exchange unit 30 and the box assembly 20 and / or the battery cell assembly 10, thereby increasing the effective heat exchange area between the heat exchange unit 30 and the box assembly 20 and / or the battery cell assembly 10, thereby improving the heat exchange efficiency.

[0158] It should be noted that the flexible member 31 can have conductive properties, which is beneficial for equipotential setting; the flexible member 31 can also have electrical insulation properties, without the need for insulation treatment, which is beneficial for reducing the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0159] The battery device provided in the embodiment of the present application includes a box assembly 20, a battery cell assembly 10, a heat exchange unit 30 and an adjustment assembly 40. The battery cell assembly 10 is arranged in the first accommodating cavity 23 of the box assembly 20, and the box assembly 20 protects the battery cell assembly 10. The heat exchange unit 30 is used to exchange heat with the battery cell assembly 10. On the one hand, the heat exchange unit 30 includes a flexible heat exchange unit, which is made of a flexible part 31. The flexible part 31 is relatively light in weight, which is beneficial to reducing the weight of the battery device 100, reducing the production cost of the heat exchange unit 30, and improving the energy density of the battery device 100; on the other hand, by setting the flexible part 31 as a flexible structure, the flexible structure has a certain deformation ability, which can make the heat exchange unit 30 better fit and adapt to the box assembly 20 and / or the battery cell assembly 10, thereby absorbing the assembly tolerance of the heat exchange unit 30, improving the fit between the heat exchange unit 30 and the box assembly 20 and / or the battery cell assembly 10, and increasing the effective heat exchange area between the heat exchange unit 30 and the box assembly 20 and / or the battery cell assembly 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit 30.

[0160] In addition, by setting up an adjustment component 40, the adjustment component 40 can adjust the flow cross-sectional area of at least one heat exchange flow channel 32 by squeezing the flexible flow channel portion, that is, the flow rate of the heat exchange medium in the heat exchange flow channel 32 can be adjusted differently. In this way, the flow rate difference of the heat exchange medium in each heat exchange flow channel 32 can be adjusted accordingly according to the temperature difference of different areas of the battery device 100, or according to the temperature difference of different states of the battery device 100, thereby further improving the heat exchange efficiency and heat exchange effect of the heat exchange unit 30, and thereby improving the thermal management performance and temperature uniformity of the battery device 100.

[0161] Here, the heat exchange unit 30 may be disposed in the first accommodating cavity 23 , that is, the heat exchange unit 30 may be in direct contact with the battery cell assembly 10 , thereby further improving the heat exchange efficiency between the heat exchange unit 30 and the battery cell assembly 10 .

[0162] Of course, in other implementations, please refer to Figure 2 A heat exchange unit 30 may be provided on the outside of the first accommodating chamber 23 .

[0163] That is, at least a portion of the heat exchange unit 30 is disposed outside the first accommodating cavity 23 , so as to separate the heat exchange unit 30 from the battery cell assembly 10 .

[0164] In the related art, the heat exchange unit and the battery cell assembly are arranged in the same space. When the heat exchange medium in the above cooling system is prone to leakage, the risk of short circuit of the battery cell assembly in the battery device box is increased, affecting the reliability of the battery device.

[0165] In this embodiment, a heat exchange unit 30 is provided on the outside of the first accommodating cavity 23 to separate the heat exchange unit 30 from the battery cell assembly 10, thereby reducing the risk of the heat exchange medium of the heat exchange unit 30 leaking and contacting the battery cell assembly 10, thereby reducing the risk of short circuit of the battery device 100 and improving the reliability of the battery device 100.

[0166] The box assembly 20 is used to accommodate the battery cell assembly 10. The box assembly 20 can be of various structures. In some embodiments, please refer to Figure 2 and Figure 8 The housing assembly 20 includes a housing body 21. The housing body 21 may include a first housing portion 211 and a second housing portion 212. The first housing portion 211 and the second housing portion 212 cover each other and together define a first accommodating cavity 23 for accommodating the battery cell assembly 10. The second housing portion 212 may be a hollow structure with one end open. The first housing portion 211 is a plate-like structure. The first housing portion 211 covers the open side of the second housing portion 212 to form the housing body 21 having the first accommodating cavity 23. The first housing portion 211 and the second housing portion 212 may also each be a hollow structure with one end open. The open side of the first housing portion 211 covers the open side of the second housing portion 212 to form the housing body 21 having the first accommodating cavity 23. Of course, the first housing portion 211 and the second housing portion 212 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0167] In order to improve the sealing performance after the first box body 211 and the second box body 212 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 211 and the second box body 212 .

[0168] Assuming that the first box portion 211 covers the top of the second box portion 212 , the first box portion 211 can also be referred to as an upper box cover, and the second box portion 212 can also be referred to as a lower box cover.

[0169] In other embodiments, please refer to Figure 2 The box assembly 20 includes a box body 21 and a bottom guard plate 22. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the outer side wall of the box body 21. A heat exchange unit 30 is disposed in the second accommodating cavity 24.

[0170] It should be noted that the bottom guard plate 22 can be arranged at the bottom of the box body 21. In this case, the bottom guard plate 22 is, for example, the bottom guard plate 22. The bottom guard plate 22 can also be arranged at the top of the box body 21 or at the side of the box body 21.

[0171] For example, see Figures 2 to 4The box assembly 20 includes a box body 21 and a bottom guard plate 22. The box body 21 includes a first box body portion 211 and a second box body portion 212. A first accommodating cavity 23 is formed between the first box body portion 211 and the second box body portion 212. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box body portion 212. A heat exchange unit 30 is arranged in the second accommodating cavity 24.

[0172] Here, the heat exchange unit 30 is provided in the second accommodating chamber 24, which means that the heat exchange unit 30 can be provided only in the second accommodating chamber 24, or the heat exchange unit 30 can be provided in other areas except the second accommodating chamber 24 in addition to being provided in the second accommodating chamber 24.

[0173] A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box portion 212 , that is, the first accommodating cavity 23 and the second accommodating cavity 24 are separated.

[0174] Here, by providing the bottom guard plate 22 , the heat exchange unit 30 can be supported and protected.

[0175] The heat exchange unit 30 is arranged in the second accommodating cavity 24, that is, the heat exchange unit 30 is arranged outside the first accommodating cavity 23, so as to separate the heat exchange unit 30 from the battery cell assembly 10, thereby avoiding the heat exchange medium of the heat exchange unit 30 from leaking and contacting the battery cell assembly 10, thereby causing the battery device 100 to short-circuit, thereby improving the safety performance and reliability of the battery device 100.

[0176] In this embodiment, a bottom guard plate 22 is provided on the outside of the box body 21 to define a second accommodating chamber 24 between the bottom guard plate 22 and the second box portion 212. A heat exchange unit 30 is disposed within the second accommodating chamber 24 for heat exchange with the box body 21, thereby achieving heat exchange for the battery cell assembly 10 carried within the box body 21. In other words, by disposing the heat exchange unit 30 outside the first accommodating chamber 23 of the box assembly 20, the problem of short circuiting of the battery device 100 due to leakage of the heat exchange medium from the heat exchange unit 30 can be avoided to a certain extent, thereby improving the safety and reliability of the battery device 100, and maximizing the utilization of the accommodating chamber within the box assembly 20, thereby increasing the compactness of the battery device 100. Furthermore, by providing the bottom guard plate 22, the bottom guard plate 22 cooperates with the box body 21 to connect and protect the battery cell assembly 10, further improving the reliability of the box assembly 20.

[0177] In some embodiments, see Figures 2 to 7 Part of the bottom guard plate 22 protrudes to form a circle of connecting portion 221, and the connecting portion 221 is sealed and connected to the second box body portion 212.

[0178] Part of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , and the connecting portions 221 are used to connect with the second box portion 212 .

[0179] Exemplarily, the edge of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , that is, the outermost circle of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 .

[0180] The specific method of connecting the connecting portion 221 and the second box body portion 212 is not limited herein. For example, the connecting portion 221 and the second box body portion 212 are fastened together by bolts, screws, or rivets.

[0181] In this embodiment, the protruding connecting portion 221 forms a circle, which not only connects to the second housing portion 212 but also defines a second accommodating chamber 24 between the bottom guard plate 22 and the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 can, to a certain extent, prevent mud, sand, or water from entering the second accommodating chamber 24, thereby protecting the heat exchange unit 30 within the second accommodating chamber 24.

[0182] In some embodiments, the box assembly 20 further includes a seal, which is disposed between the connecting portion 221 and the second box portion 212 .

[0183] Exemplarily, the sealing member is, for example, a sealing strip.

[0184] In this embodiment, a seal is provided and the seal is clamped between the connecting portion 221 and the second box portion 212. That is, the seal is used to seal the gap between the connecting portion 221 and the second box portion 212, which further helps to prevent mud, sand or water from entering the second accommodating cavity 24, thereby improving the sealing performance between the bottom guard plate 22 and the second box portion 212.

[0185] In some embodiments, see Figures 2 to 7 Part of the bottom guard plate 22 is protruding to form a limiting structure 222. The limiting structure 222 is used to support the flexible member 31 and / or the second box portion 212.

[0186] Here, the limiting structure 222 is used to support the flexible member 31 and / or the second box body 212, which means that the limiting structure 222 abuts against the flexible member 31 and / or the second box body 212, providing a certain supporting force for the flexible member 31 and / or the second box body 212. In other words, the limiting structure 222 can be used to support the flexible member 31, the second box body 212, or both the flexible member 31 and the second box body 212.

[0187] It should be noted that part of the area of the bottom guard plate 22 is protruding to form a limiting structure 222, which may mean that the side of the bottom guard plate 22 facing away from the box body 21 is concave, so that the side of the bottom guard plate 22 facing the box body 21 is protruding to form the limiting structure 222; it may also be that the side of the bottom guard plate 22 facing away from the box body 21 is not concave, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protruded to form the limiting structure 222.

[0188] The limiting structure 222 is used to support the flexible member 31 and / or the second box portion 212 so as to form a fixed space between the bottom guard plate 22 and the second box portion 212 , which is beneficial to improving the reliability of the battery device 100 .

[0189] In this embodiment, the bottom guard plate 22 is used to support the flexible part 31 and / or the second box body 212 by setting a limiting structure 222. This is beneficial to improving the problem of deformation of the second box body 212 due to insufficient support strength when it is under pressure, thereby improving the problem of the second box body 212 directly adhering to the heat exchange unit 30, which causes the heat exchange unit 30 to be crushed, and is beneficial to improving the stability of the thermal interface contact of the heat exchange unit 30, thereby improving the thermal management performance of the heat exchange unit 30.

[0190] In some embodiments, the limiting structure 222 causes the flexible member 31 to abut against the second box portion 212 to support the flexible member 31 and the second box portion 212 .

[0191] For example, in an embodiment where the limiting structure 222 is used to support the flexible member 31 , the limiting structure 222 may be supported on the surface of the flexible member 31 and cause the flexible member 31 to abut against the second box portion 212 .

[0192] In this embodiment, the limiting structure 222 is provided to abut the flexible member 31 against the second box body 212 , which not only supports the second box body 212 but also fixes the heat exchange unit 30 , thereby improving the stability of the heat exchange unit 30 .

[0193] In some embodiments, see Figures 2 to 6 The heat exchange unit 30 is provided with an avoidance hole 33 , and the limiting structure 222 passes through the avoidance hole 33 to abut against the second box body 212 .

[0194] Here, the heat exchange unit 30 is provided with an avoidance hole 33 , that is, the flexible member 31 is provided with the avoidance hole 33 , and the avoidance hole 33 passes through two opposite sides of the heat exchange unit 30 in the thickness direction.

[0195] It should be noted that the avoidance hole 33 needs to avoid the heat exchange channel 32 .

[0196] Here, the specific position and number of the avoidance holes 33 are not limited and are determined according to specific circumstances.

[0197] For example, in an embodiment where the limiting structure 222 is used to support the second box body portion 212 , the heat exchange unit 30 may be provided with an avoidance hole 33 for avoiding the limiting structure 222 so that the limiting structure 222 passes through the avoidance hole 33 to abut against the second box body portion 212 .

[0198] In this embodiment, the heat exchange unit 30 avoids the limiting structure 222 by setting an avoidance hole 33. The limiting structure 222 passes through the avoidance hole 33 to abut against the second box body 212. While supporting the second box body 212, it can also position the heat exchange unit 30, thereby improving the stability of the heat exchange unit 30.

[0199] In some embodiments, see Figures 2 to 6 At least two flexible members 31 include a hot pressing region 34. The hot pressing region 34 is configured by hot pressing the at least two flexible members 31. The hot pressing region 34 separates the heat exchange unit 30 to form at least one heat exchange channel 32.

[0200] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange unit 30 has good sealing performance and is not prone to cracking.

[0201] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange unit 30 to form at least one heat exchange channel 32. This molding method is simple.

[0202] It should be noted that there are many ways to control the flow cross-sectional area of the heat exchange channel 32 .

[0203] In some embodiments, the width of at least one heat exchange channel 32 is different from the widths of the other heat exchange channels 32 .

[0204] That is to say, the widths of the heat exchange channels 32 are not all the same, that is, the initial flow cross-sectional areas of the heat exchange channels 32 are different.

[0205] It should be noted that the greater the width of the heat exchange channel 32, the greater the cross-sectional area of the heat exchange channel 32, and thus the greater the flow rate of the heat exchange medium in the heat exchange channel 32. In other words, the cross-sectional area of the heat exchange channel 32 is controlled according to the width of the heat exchange channel 32.

[0206] In this embodiment, the width of the heat exchange channel 32 can be designed to be different according to the heat dissipation requirements of different areas of the battery device 100. For example, the width of the heat exchange channel 32 corresponding to the high-temperature area of the battery device 100 is generally larger, and the width of the heat exchange channel 32 corresponding to the low-temperature area of the battery device 100 is smaller. According to the temperature changes in different areas of the battery device 100, the flow of the heat exchange medium is distributed, the overall temperature of the battery device 100 is accurately adjusted, the heat exchange efficiency and heat exchange effect of the heat exchange unit 30 are improved, and the thermal management performance and temperature uniformity of the battery device 100 are thereby improved.

[0207] In some embodiments, see Figures 8 to 11 The battery device 100 further includes a regulating component 40 . The regulating component 40 is disposed in the heat exchange unit 30 and is used to control the size of the flow cross-sectional area of at least one heat exchange channel 32 .

[0208] The regulating component 40 is used to control the size of the flow cross-sectional area of at least one heat exchange channel 32, which means that the regulating component 40 can be used to control the size of the flow cross-sectional area of one heat exchange channel 32, or can be used to control the size of the flow cross-sectional area of multiple heat exchange channels 32, for example, to control the size of the flow cross-sectional area of all heat exchange channels 32.

[0209] Here, the initial flow cross-sectional areas of the heat exchange channels 32 may be the same or different.

[0210] It should be noted that the specific location of the adjustment assembly 40 is not limited herein. For example, the adjustment assembly 40 is disposed near the inlet 35 or near the outlet 36. This facilitates full utilization of the space at the inlet 35 or outlet 36, thereby improving the structural compactness of the battery device 100 and further increasing the energy density of the battery device 100.

[0211] In this embodiment, an adjustment component 40 is provided to control the size of the flow cross-sectional area of at least one of the heat exchange channels 32. Thus, the size of the flow cross-sectional area of the heat exchange channel 32 in the corresponding area can be dynamically adjusted according to the temperature changes in different areas of the battery device 100, thereby achieving the effect of dynamically distributing the flow of the heat exchange medium, which is beneficial to improving the heat dissipation performance of the high-temperature area of the battery device 100 and further improving the thermal management performance and temperature uniformity of the battery device 100.

[0212] It should be noted that the specific structure of the adjustment component 40 is not limited here.

[0213] In some embodiments, see Figure 8 and Figure 9The regulating assembly 40 includes at least two control members 42 , each control member 42 corresponds to a different heat exchange channel 32 , and at least two control members 42 can compress the heat exchange channel 32 by moving.

[0214] The regulating component 40 is provided with a plurality of control components 42, each control component 42 being used to correspond to a different heat exchange channel 32, that is, the heat exchange channel 32 can be compressed by controlling each control component 42, and the flow cross-sectional area of each heat exchange channel 32 can be controlled by controlling each control component 42 to be close to or away from each heat exchange channel 32.

[0215] It should be noted that the control of the flow cross-sectional area size of each heat exchange channel 32 by each control component 42 can be fixed difference control, that is, the difference in the flow cross-sectional area size of each heat exchange channel 32 is fixed, that is, the size of the flow cross-sectional area of each heat exchange channel 32 needs to be changed at the same time, or it can be dynamic difference control, that is, the difference in the flow cross-sectional area size of each heat exchange channel 32 may not be fixed, that is, the size of the flow cross-sectional area of each heat exchange channel 32 does not need to be changed at the same time.

[0216] In this embodiment, since the flexible member 31 is a flexible structure, the flow cross-sectional area of each heat exchange channel 32 can be controlled by controlling the control member 42 to be close to or away from each heat exchange channel 32 .

[0217] In some embodiments, please refer to Figure 8 and Figure 9 The adjustment assembly 40 further includes a connector 41. One end of each control member 42 is connected to the connector 41. The free end of each control member 42 is used to compress the heat exchange flow channel 32. The distance between the free end of at least one control member 42 and the connector 41 is different from the distance between the free end of the other control members 42 and the connector 41.

[0218] One end of each control member 42 is connected to the connecting member 41, that is, the connecting member 41 is used to assemble each control member 42, thereby, the movement of the connecting member 41 can be controlled to achieve simultaneous movement of each control member 42, and the displacement of the movement is the same.

[0219] Here, the connecting member 41 is, for example, a connecting plate or a connecting block.

[0220] Here, the control member 42 is, for example, a control panel or a control block.

[0221] One end of each control member 42 away from the connecting member 41 is a free end of each control member 42 , and the free end of each control member 42 is used to compress the heat exchange channel 32 .

[0222] The distance between the free end of at least one control member 42 and the connecting member 41 is different from the distance between the free ends of the other control members 42 and the connecting member 41. In other words, the heights of the control members 42 are not all the same. The heights of the control members 42 can be set to be different as needed. In this way, the distances between the control members 42 and the heat exchange channels 32 are also different, thereby achieving fixed differential control of the heat exchange channels 32 by each control member 42.

[0223] In this embodiment, by setting the heights of each control component 42 to be different, that is, by controlling the connecting component 41 to be close to or away from the heat exchange unit 30, it is possible to achieve fixed differential control of each heat exchange channel 32 by each control component 42, and the movement mode and control mode of the adjustment component are simple and reliable.

[0224] In some embodiments, see Figure 8 and Figure 9 The regulating assembly 40 further includes a signal acquisition device and a regulating structure. The signal acquisition device is used to collect temperature information of different regions of the battery cell assembly 10. The regulating structure is used to control the compression amount of the heat exchange flow channel 32 by the control member 42 based on the temperature information.

[0225] Here, the specific type of the signal acquisition device is not limited, for example, it is a temperature sensor.

[0226] Here, the specific type of the adjustment structure is not limited here, for example, it can be a linear module or a cylinder, etc., which can control the control member 42 to move in a direction close to or away from the heat exchange channel 32.

[0227] In this embodiment, a signal acquisition device and an adjustment structure are provided to collect temperature information of different areas of the battery cell assembly 10 through the signal acquisition device. The adjustment structure is used to control the compression amount of the heat exchange channel 32 by the control component 42 according to the temperature information. That is, the size of the flow cross-sectional area of the heat exchange channel 32 in the corresponding area can be dynamically adjusted according to the temperature changes in different areas of the battery device 100, further improving the accuracy of the temperature adjustment of the battery device 100.

[0228] In some embodiments, see Figure 10 and Figure 11 The regulating assembly 40 includes a thermostat 43, which is disposed between the battery cell assembly 10 and the heat exchange unit 30. The battery cell assembly 10, thermostat 43, and heat exchange unit 30 are arranged in a first direction. When the temperature of the battery cell assembly 10 rises, the thermostat 43 absorbs heat and expands in a direction perpendicular to the first direction, and contracts in the first direction. The compression of the heat exchange channel 32 by the thermostat 43 is reduced.

[0229] Here, the first direction is not limited here, and the embodiment of the present application takes the first direction as the height direction as an example.

[0230] The thermostat 43 is disposed between the battery cell assembly 10 and the heat exchange unit 30 . For example, the thermostat 43 is located at the bottom of the battery cell assembly 10 and above the heat exchange unit 30 .

[0231] It should be noted that the specific structure of the thermostat 43 is not limited herein. For example, the interior of the thermostat 43 is a temperature-control material that rapidly expands when heated and contracts when cooled. The outer shell of the thermostat 43 is made of an elastic material, which facilitates the expansion or contraction of the thermostat 43.

[0232] Here, one thermostat 43 may correspond to one heat exchange channel 32 , or one thermostat 43 may correspond to multiple heat exchange channels 32 .

[0233] In this embodiment, by setting a thermostat 43, when the temperature of the battery cell assembly 10 rises, the thermostat 43 absorbs heat and expands in a direction perpendicular to the first direction and contracts along the first direction. In this way, the size of the thermostat 43 in the first direction can be reduced, thereby reducing the compression amount of the thermostat 43 on the heat exchange channel 32. The flow cross-sectional area of the heat exchange channel 32 corresponding to this area is increased, which is conducive to improving the heat dissipation of this area, thereby realizing automatic control of the flow cross-sectional area size of the heat exchange channel 32.

[0234] In some embodiments, the flexible member 31 is configured as a metal plasticized film.

[0235] The flexible member 31 is a single-layer or multi-layer film.

[0236] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0237] In this embodiment, the thin and lightweight metal-plasticized films, combined with the heat exchange channel 32 formed between at least two metal-plasticized films, are unaffected by the extrusion process and do not require a high thickness. This reduces the overall thickness and weight of the heat exchange unit 30. Furthermore, the insulation properties of the heat exchange unit 30 reduce the risk of insulation failure. This reduces the risk of reaction between the heat exchange unit 30 and the heat exchange medium flowing within, further minimizing the risk of corrosion and leakage of the heat exchange medium.

[0238] Exemplarily, at least two flexible members 31 are configured as aluminum-plastic films.

[0239] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0240] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0241] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0242] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0243] Here, the number of metal layers and non-metal layers is not limited.

[0244] In this embodiment, the flexible member 31, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a heat exchange channel 32 between at least two flexible members 31, it is unaffected by the extrusion process and eliminates the need for a high thickness requirement. This reduces the overall thickness and weight of the heat exchange unit 30. Furthermore, the heat exchange unit 30 does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0245] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil.

[0246] By setting the metal layer to be one of aluminum foil, copper foil and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0247] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0248] By setting the non-metallic layer to be one of polypropylene, polyvinyl chloride and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0249] For example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0250] In some embodiments, the non-metallic layer is a hot melt layer.

[0251] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0252] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the heat exchange channel 32 than the corrosion-resistant layer.

[0253] Here, the corrosion-resistant layer may be a nylon layer formed of nylon material, thereby having certain corrosion resistance, such as acid and alkali corrosion resistance.

[0254] The isolation layer may be a metal layer, and the metal layer may be configured as one of aluminum foil, copper foil and steel foil, which can provide the flexible member 31 with a certain structural strength and play an isolation role.

[0255] The waterproof layer may be a non-metallic layer, and the non-metallic layer may be configured to be one of polypropylene, polyvinyl chloride and polyethylene, so that the flexible member 31 may have a certain waterproof effect.

[0256] In this embodiment, by configuring the flexible member 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the heat exchange channel 32 than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange unit 30.

[0257] In some embodiments, see Figures 2 to 6 The flexible member 31 includes a hot pressing region 34 . The hot pressing region 34 is formed by hot pressing at least two flexible members 31 . The hot pressing region 34 separates the heat exchange unit 30 to form at least one heat exchange channel 32 .

[0258] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange unit 30 has good sealing performance and is not prone to cracking.

[0259] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange unit 30 to form at least one heat exchange channel 32. This molding method is simple.

[0260] In some embodiments, the isolation layer has a thickness of 6.5 μm to 100 μm.

[0261] The thickness of the isolation layer can be any one of 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm or any value between two of them.

[0262] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-100 μm, the flexible member 31 can have a certain structural strength and flexibility.

[0263] In some embodiments, the isolation layer has a thickness of 6.5 μm to 15 μm.

[0264] The thickness of the isolation layer can be any one of 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm or any value between any two of them.

[0265] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-15 μm, the flexible member 31 can be further endowed with certain structural strength and flexibility.

[0266] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm to 20 μm.

[0267] The thickness of the corrosion-resistant layer can be 5μm, 5.5μm, 5.8μm, 6μm, 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11. Any one of the point values of 8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 18.7μm, 19μm, 19.5μm, 20μm or any point value between any two of them.

[0268] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5 μm-20 μm, the wear resistance and toughness of the flexible member 31 can be improved.

[0269] In some embodiments, the waterproof layer has a thickness of 50 μm to 120 μm.

[0270] The thickness of the waterproof layer can be any one of 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, 120μm or any value between two of them.

[0271] In this embodiment, by setting the thickness of the waterproof layer to 50 μm-120 μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible member 31 through the waterproof layer.

[0272] In some embodiments, the thickness of the flexible member 31 is 0.05 mm to 0.3 mm.

[0273] 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.

[0274] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange unit 30 made of the flexible part 31 has a certain structural strength while the overall thickness of the heat exchange unit 30 is smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0275] In some embodiments, the thickness of the flexible member 31 is 0.08 mm to 0.2 mm.

[0276] 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.

[0277] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange unit 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange unit 30 is further made smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0278] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0279] Exemplarily, the elastic modulus of the flexible part 31 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0280] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to a certain force range. It is one of the fundamental physical quantities of a material. The larger the elastic modulus, the greater the material's stiffness and compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0281] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange unit 30, and has a certain deformation ability, which can improve the fit between the heat exchange unit 30 and the box assembly 20 and / or the battery assembly battery cell assembly 10, thereby increasing the effective heat exchange area between the heat exchange unit 30 and the box assembly 20 and / or the battery assembly battery cell assembly 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange unit 30.

[0282] It should be noted that the thickness of the flexible member 31 and the elastic modulus of the flexible member 31 can be measured by a micrometer, a dynamometer or a vernier caliper.

[0283] In the description of this application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in this application and features of different embodiments or examples, unless they are mutually inconsistent.

[0284] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: The box assembly has a first accommodating cavity therein; A battery cell assembly is disposed in the first accommodating cavity; a heat exchange unit, the heat exchange unit being configured to exchange heat with the battery cell assembly; the heat exchange unit comprising a flexible heat exchange unit having at least one flexible flow channel portion, the flexible flow channel portion forming a heat exchange flow channel; An adjusting component is provided, wherein the adjusting component squeezes the flexible flow channel portion to adjust the flow channel cross-sectional area of at least one of the heat exchange flow channels.

2. The battery device according to claim 1, wherein: The regulating component is provided in the heat exchange unit, and the regulating component is configured to control the size of the flow cross-sectional area of at least one of the heat exchange channels.

3. The battery device according to claim 2, characterized in that The regulating assembly includes at least two control members, each of which corresponds to a different heat exchange channel, and the at least two control members can compress the heat exchange channel by moving.

4. The battery device according to claim 3, characterized in that The adjustment component also includes a connecting member, one end of each of the control members is connected to the connecting member, the free end of each of the control members is used to compress the heat exchange flow channel, and the distance between the free end of at least one of the control members and the connecting member is different from the distance between the free end of the other control members and the connecting member.

5. The battery device according to claim 3, wherein: The regulating component also includes a signal acquisition device and a regulating structure. The signal acquisition device is used to collect temperature information of different areas of the battery cell assembly. The regulating structure is used to control the compression amount of the heat exchange channel by the control component based on the temperature information.

6. The battery device according to claim 2, wherein: The regulating assembly includes a thermostat, which is arranged between the battery cell assembly and the heat exchange unit. The arrangement direction of the battery cell assembly, the thermostat and the heat exchange unit is limited to a first direction; when the temperature of the battery cell assembly rises, the thermostat absorbs heat and expands in a direction perpendicular to the first direction and contracts in the first direction, and the compression amount of the heat exchange channel by the thermostat is reduced.

7. The battery device according to claim 1, wherein: The width of at least one of the heat exchange channels is different from the width of the other heat exchange channels.

8. The battery device according to any one of claims 1 to 7, characterized in that: The flexible heat exchange unit includes at least two flexible parts, which are stacked and at least one heat exchange channel is formed between the flexible parts. The at least one heat exchange channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

9. The battery device according to claim 8, characterized in that The at least two flexible members are configured as metal plasticized films.

10. The battery device according to claim 8, characterized in that The at least two flexible members are configured as aluminum-plastic films.

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

12. The battery device according to claim 11, wherein: The metal layer includes one of aluminum foil, copper foil and steel foil.

13. The battery device according to claim 11, wherein: The non-metallic layer includes one of polypropylene, polyvinyl chloride and polyethylene.

14. The battery device according to claim 11, wherein: The non-metallic layer is a hot-melt layer.

15. The battery device according to claim 8, wherein: The flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the heat exchange channel than the corrosion-resistant layer.

16. The battery device according to claim 15, characterized in that The thickness of the isolation layer is 6.5 μm-100 μm.

17. The battery device according to claim 16, characterized in that The thickness of the isolation layer is 6.5 μm-15 μm.

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

19. The battery device according to claim 15, wherein: The thickness of the waterproof layer is 50 μm-120 μm.

20. The battery device according to claim 8, wherein The thickness of the flexible member is 0.05mm-0.3mm.

21. The battery device according to claim 20, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

22. The battery device according to claim 8, characterized in that The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

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

24. A heat exchange unit, characterized in that: The heat exchange unit is the heat exchange unit of the battery device according to any one of claims 1 to 23, and the heat exchange unit is used to exchange heat with the battery cell assembly.

25. An electrical device, characterized in that: The method comprises the battery device according to any one of claims 1 to 23 or the heat exchange unit according to claim 24.

26. An energy storage device, characterized in that: The method comprises the battery device according to any one of claims 1 to 23 or the heat exchange unit according to claim 24.

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