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

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device, electric equipment and energy storage equipment. The battery device comprises a box body assembly, a battery monomer assembly and a heat exchange 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 assembly is used for exchanging heat with the battery monomer assembly. The heat exchange assembly comprises a plurality of flexible heat exchange units and a hard current collector, a medium runner for conducting a heat exchange medium is arranged in each flexible heat exchange unit, the heat exchange medium is used for carrying out heat exchange with the battery monomer assembly, and the hard current collector is communicated with and supports the plurality of flexible heat exchange units. According to the battery device provided by the embodiment of the invention, the heat exchange efficiency and the heat exchange effect of the heat exchange assembly can be improved, the development period of the heat exchange assembly can be shortened, and the research and development efficiency of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a heat exchange component, 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 component, a battery device, and an electrical device that 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 assembly, which is used to exchange heat with the battery cell assembly; the heat exchange assembly includes multiple flexible heat exchange units and a hard collector, the flexible heat exchange unit has a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly, and the hard collector connects and supports the multiple flexible heat exchange units.

[0009] The battery device provided in the embodiment of the present application includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. On the one hand, by setting the heat exchange assembly to include multiple flexible heat exchange units and a hard current collector, the hard current collector connects and supports multiple flexible heat exchange units. That is to say, the heat exchange assembly can be made into a flexible heat exchange unit in the form of a standard monomer. According to the structure of the battery cell assembly, the corresponding flexible heat exchange unit is selected and spliced and assembled into an adapted heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device; on the other hand, the flexible heat exchange unit is made of flexible parts, and the weight of the flexible parts is relatively light, which is conducive to reducing the weight of the battery device and reducing the heat exchange assembly. On the other hand, by setting the flexible part as a flexible structure, the flexible part of the flexible structure can be designed according to the arrangement of the battery cell assembly and the structure of the battery device, so that the heat exchange component is better fitted with the box assembly and / or the battery cell assembly, which is conducive to absorbing the assembly tolerance of the heat exchange component, eliminating the need for fillers or thermal conductive materials, improving the fit between the heat exchange component and the box assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange component and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0010] In some embodiments, the heat exchange assembly includes a plurality of heat exchange groups arranged along a first direction, each of the heat exchange groups includes at least one flexible heat exchange unit, the flow direction of the heat exchange medium in the flexible heat exchange unit of each heat exchange group is the same, the heat exchange groups are connected end to end so that the heat exchange groups are connected in series, the flexible heat exchange units extend along a second direction, and the first direction intersects with the second direction.

[0011] In this embodiment, the flexible heat exchange units are first spliced and assembled into a heat exchange group, and then the heat exchange group is spliced and assembled into a heat exchange assembly compatible with the battery cell assembly to form a medium flow path for the circulation of the heat exchange medium. The corresponding flexible heat exchange units can be selected according to the structure of the battery cell assembly to be spliced and assembled into a compatible heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device.

[0012] In some embodiments, adjacent heat exchange groups are connected via the hard current collector.

[0013] In this embodiment, the same end of adjacent heat exchange groups can be connected to the same hard current collector, so that the adjacent heat exchange groups can be connected in series.

[0014] In some embodiments, the flexible heat exchange units of some adjacent heat exchange groups are connected to the same hard current collector.

[0015] In this embodiment, the same end of some adjacent heat exchange groups can be connected to the same hard current collector, so that the adjacent heat exchange groups can be connected in series.

[0016] In some embodiments, the heat exchange assembly includes a first heat exchange group, a second heat exchange group, a third heat exchange group, and a fourth heat exchange group arranged in sequence along a first direction, and the hard current collector includes a first hard current collector, a second hard current collector, a third hard current collector, a fourth hard current collector, and a fifth hard current collector;

[0017] The first end of the first heat exchange group is connected to the inlet through the first hard current collector, the second end of the first heat exchange group is connected to the first end of the second heat exchange group through the second hard current collector, the second end of the second heat exchange group is connected to the first end of the third heat exchange group through the third hard current collector, the second end of the third heat exchange group is connected to the first end of the fourth heat exchange group through the fourth hard current collector, and the second end of the fourth heat exchange group is connected to the outlet through the fifth hard current collector.

[0018] The heat exchange assembly includes a first heat exchange group, a second heat exchange group, a third heat exchange group and a fourth heat exchange group arranged in sequence along the first direction, that is, the first heat exchange group, the second heat exchange group, the third heat exchange group and the fourth heat exchange group are connected end to end in sequence.

[0019] In some embodiments, each heat exchange group is provided with an independent hard current collector at both ends along the second direction, and the hard current collectors corresponding to at least some adjacent heat exchange groups are connected.

[0020] In this embodiment, an independent hard current collector is provided at both ends of each heat exchange group along the second direction. In this way, the two ends of each heat exchange group can be first connected to form a whole through the independent hard current collector, and then the adjacent heat exchange groups can be connected and communicated through their respective corresponding hard current collectors, thereby further improving the assembly efficiency of the heat exchange component.

[0021] In some embodiments, the flexible heat exchange unit is plugged into the hard current collector.

[0022] In this embodiment, by arranging the flexible heat exchange unit and the hard current collector to be plug-fitted, the connection structure is simple, and the assembly efficiency between the flexible heat exchange unit and the hard current collector is further improved.

[0023] In some embodiments, the heat exchange assembly further includes a connector, and both ends of the flexible heat exchange unit are connected to the hard current collector through the connector.

[0024] The specific structure of the connecting piece is not limited here, and it can be, for example, a connecting pipe with a hard structure, thereby further improving the assembly efficiency between the flexible heat exchange unit and the hard current collector.

[0025] In some embodiments, the flexible heat exchange unit has a buffer cavity disposed inside thereof and spaced apart from the medium flow channel, and the buffer cavity is disposed on at least one side of the medium flow channel along the width direction of the flexible heat exchange unit.

[0026] In this embodiment, a buffer cavity is provided on at least one side of the medium flow channel along the width direction of the flexible heat exchange unit, which can provide a buffering effect when the heat exchange component is impacted. Furthermore, by arranging the buffer cavity at the edge of the medium flow channel, the buffering effect is improved.

[0027] In some embodiments, the thermal conductivity of the flexible member on a side away from the battery cell assembly is smaller than the thermal conductivity of the flexible member on a side close to the battery cell assembly.

[0028] In this embodiment, by setting the thermal conductivity of the flexible part on the side away from the battery cell assembly to be smaller than the thermal conductivity of the flexible part on the side close to the battery cell assembly, this helps to improve the heat exchange efficiency of the heat exchange assembly while reducing the thermal conductivity of the flexible part on the side away from the battery cell assembly, which is beneficial to heat preservation.

[0029] In some embodiments, the heat exchange assembly further includes a recovery device, and the recovery device is used to recover the heat exchange medium in the medium flow channel.

[0030] When the thermal management system is not working, the heat exchange medium in the heat exchange assembly can be recovered, reducing the probability of heat exchange medium leakage causing a short circuit in the battery device, thereby improving the reliability of the battery device.

[0031] In some embodiments, the heat exchange assembly further includes an inflation device, and the inflation device is used to inflate air into the medium flow channel.

[0032] When the thermal management system is not working, the heat exchange medium in the heat exchange component can be recovered and then used to inflate the medium flow channel through the inflation device, which is equivalent to playing a heat insulation role, further helping to improve the thermal insulation performance of the battery device.

[0033] In some embodiments, the heat exchange component is disposed in the first accommodating cavity.

[0034] By arranging a heat exchange assembly on the outside of the first accommodating cavity, the heat exchange assembly is separated from the battery cell assembly, thereby preventing the heat exchange medium of the heat exchange assembly from leaking and contacting the battery cell assembly, thereby preventing the battery device from short-circuiting, thereby improving the safety performance and reliability of the battery device.

[0035] In some embodiments, the box assembly includes a box body and a bottom guard plate, the box body includes a first box body part and a second box body part, a first accommodating cavity is formed between the first box body part and the second box body part, a second accommodating cavity is formed between the bottom guard plate and the bottom wall of the second box body part, and the heat exchange assembly is arranged in the second accommodating cavity.

[0036] By disposing a bottom guard plate on the outside of the box body, a second accommodating chamber is defined between the bottom guard plate and the second box body portion, and a heat exchange assembly is disposed within the second accommodating chamber for heat exchange with the box body, thereby achieving heat exchange for the battery cell assembly carried within the box body. In other words, by disposing the heat exchange assembly outside the first accommodating chamber of the box assembly, the problem of short circuiting the battery device due to leakage of the heat exchange medium from the heat exchange assembly can be avoided to a certain extent, thereby improving the safety and reliability of the battery device, and the utilization rate of the accommodating chamber within the box assembly can be increased, thereby improving the compactness of the battery device. On the other hand, by providing the bottom guard plate, the bottom guard plate cooperates with the box body to connect and protect the battery cell assembly, further improving the reliability of the box assembly.

[0037] In some embodiments, the flexible heat exchange unit includes at least two flexible parts, which are stacked and at least one medium flow channel is formed between the flexible parts. The at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

[0038] In this embodiment, by setting at least part of the heat exchange unit as a flexible heat exchange unit, the flexible heat exchange unit is made of a flexible part, and the weight of the flexible part is relatively light, which is beneficial to reducing the weight of the battery device, reducing the production cost of the heat exchange component, 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 component can be better fitted with the box component and / or the battery cell component, which is beneficial to absorbing the assembly tolerance of the heat exchange component, without the need to use filler or thermal conductive material, improving the fit between the heat exchange component and the box component and / or the battery cell component, and increasing the effective heat exchange area between the heat exchange component and the box component and / or the battery cell component, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0039] In some embodiments, the at least two flexible members are configured as metal plasticized films.

[0040] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow path formed between at least two of the films, are unaffected by the extrusion process and eliminate the need for strict thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0041] In some embodiments, the at least two flexible members are configured as aluminum-plastic films.

[0042] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0043] 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.

[0044] In this embodiment, the flexible member, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel between at least two flexible members, it is unaffected by the extrusion process and eliminates the need for strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0045] In some embodiments, the metal layer includes one of aluminum foil, copper foil and steel foil.

[0046] The flexible part can have a certain structural strength and can play an isolation role.

[0047] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0048] The flexible part can be made waterproof to a certain extent.

[0049] In some embodiments, the non-metallic layer is a hot-melt layer.

[0050] 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.

[0051] In some embodiments, the flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

[0052] In this embodiment, by configuring the flexible member to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange component.

[0053] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0054] 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.

[0055] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0056] 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.

[0057] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm-20 μm.

[0058] 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.

[0059] In some embodiments, the waterproof layer has a thickness of 50 μm-120 μm.

[0060] 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.

[0061] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0062] By setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while the overall thickness of the heat exchange component is smaller, which is beneficial to reducing the overall volume and weight of the battery to increase the energy density of the battery.

[0063] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0064] By setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength, while the overall thickness of the heat exchange component is further reduced, which is conducive to further reducing the overall volume and weight of the battery, thereby further increasing the energy density of the battery.

[0065] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0066] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and also have a certain deformation ability, which can improve the fit between the heat exchange component and the box component and / or the battery component battery cell component, thereby increasing the effective heat exchange area between the heat exchange component and the box component and / or the battery component battery cell component, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0067] In some embodiments, the at least two flexible members include a hot pressing area, wherein the hot pressing area is configured such that the at least two flexible members are formed by hot pressing, and the hot pressing area defines an interior of the flexible heat exchange unit to form the medium flow channel.

[0068] 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 defines the interior of the flexible heat exchange unit to form a medium flow channel. This molding method is simple.

[0069] In some embodiments, the hot pressing area defines the interior of the flexible heat exchange unit to form the medium flow channel and the buffer cavity that are spaced apart, and the buffer cavity is provided on at least one side of the medium flow channel along the width direction of the flexible heat exchange unit.

[0070] A second aspect of an embodiment of the present application provides a heat exchange assembly, which is the heat exchange assembly of the battery device described above, and is used to exchange heat with the battery cell assembly.

[0071] The heat exchange assembly provided in the embodiment of the present application is arranged in the box assembly and is used to exchange heat with the battery monomer assembly. On the one hand, by setting the heat exchange assembly to include multiple flexible heat exchange units and a hard current collector, the hard current collector connects and supports the multiple flexible heat exchange units, that is, the heat exchange assembly can be made into a flexible heat exchange unit in the form of a standard monomer, and the corresponding flexible heat exchange unit can be selected according to the structure of the battery monomer assembly to be spliced and assembled into an adaptive heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device; on the other hand, the flexible heat exchange unit is made of flexible parts, and the weight of the flexible parts is relatively light, which is conducive to reducing the battery device. The quality of the heat exchange component is improved, the production cost of the heat exchange component is reduced, and it is beneficial to improve the energy density of the battery device; on the other hand, by setting the flexible part as a flexible structure, the flexible part of the flexible structure can be designed according to the arrangement of the battery cell assembly and the structure of the battery device, so that the heat exchange component is better fitted with the box assembly and / or the battery cell assembly, which is beneficial to absorb the assembly tolerance of the heat exchange component, eliminates the need for fillers or thermal conductive materials, improves the fit between the heat exchange component and the box assembly and / or the battery cell assembly, increases the effective heat exchange area between the heat exchange component and the box assembly and / or the battery cell assembly, and thus improves the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0072] A third aspect of an embodiment of the present application provides an electrical device, comprising the battery device or the heat exchange assembly described above.

[0073] The battery device of the electrical equipment provided in the embodiment of the present application includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. The heat exchange assembly is also arranged in the box assembly for exchanging heat with the battery cell assembly. On the one hand, by setting the heat exchange assembly to include multiple flexible heat exchange units and a hard current collector, the hard current collector connects and supports multiple flexible heat exchange units, that is, the heat exchange assembly can be made into a flexible heat exchange unit in the form of a standard monomer, and the corresponding flexible heat exchange unit can be selected according to the structure of the battery cell assembly to be spliced and assembled into an adapted heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device; on the other hand, the flexible heat exchange unit is made of flexible parts, and the weight of the flexible parts is relatively light, which is conducive to reducing the weight of the battery device. The production cost of the heat exchange component is reduced, and it is beneficial to improve the energy density of the battery device; on the other hand, by setting the flexible part as a flexible structure, the flexible part of the flexible structure can be designed according to the arrangement of the battery cell assembly and the structure of the battery device, so that the heat exchange component and the box assembly and / or the battery cell assembly are better fitted, which is beneficial to absorb the assembly tolerance of the heat exchange component, and there is no need to use filler or thermal conductive material, thereby improving the fit between the heat exchange component and the box assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange component and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0074] A fourth aspect of an embodiment of the present application provides an energy storage device, comprising the battery device or the heat exchange assembly described above.

[0075] The battery device of the energy storage device provided in the embodiment of the present application includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. On the one hand, by setting the heat exchange assembly to include multiple flexible heat exchange units and a hard current collector, the hard current collector connects and supports multiple flexible heat exchange units, that is, the heat exchange assembly can be made into a flexible heat exchange unit in the form of a standard monomer, and the corresponding flexible heat exchange unit can be selected according to the structure of the battery cell assembly to be spliced and assembled into an adapted heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device; on the other hand, the flexible heat exchange unit is made of flexible parts, and the weight of the flexible parts is relatively light, which is conducive to reducing the weight of the battery device and reducing the heat exchange assembly. On the other hand, by setting the flexible part as a flexible structure, the flexible part of the flexible structure can be designed according to the arrangement of the battery cell assembly and the structure of the battery device, so that the heat exchange component is better fitted with the box assembly and / or the battery cell assembly, which is conducive to absorbing the assembly tolerance of the heat exchange component, eliminating the need for fillers or thermal conductive materials, improving the fit between the heat exchange component and the box assembly and / or the battery cell assembly, and increasing the effective heat exchange area between the heat exchange component and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0077] Figure 2 A schematic exploded perspective view of a battery device according to an embodiment of the present application;

[0078] Figure 3 A cross-sectional view of a battery device provided in one embodiment of the present application;

[0079] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0080] Figure 5 A schematic structural diagram of a heat exchange assembly provided in one embodiment of the present application;

[0081] Figure 6 A schematic structural diagram of a flexible heat exchange unit provided in one embodiment of the present application;

[0082] Figure 7 for Figure 6 Cross-sectional view in the middle BB direction;

[0083] Figure 8Schematic diagram of the connection structure of the flexible heat exchange unit, connector and hard current collector provided in one embodiment of the present application.

[0084] Description of Reference Numerals

[0085] 10. Battery cell assembly; 11. Battery cell; 20. Box assembly; 21. Box body; 211. First box body; 212. Second box body; 22. Bottom guard plate; 221. Connection part; 222. Support structure; 23. First accommodating cavity; 24. Second accommodating cavity; 30. Heat exchange assembly; 31. Flexible part; 32. Medium flow channel; 34. Hot pressing area; 35. Inlet; 36. Outlet; 37. Buffer cavity; 40. Heat exchange group; 41. Flexible heat exchange unit; 42. Hard current collector; 43. Connector; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0086] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.).

[0095] 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 0.2O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), 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.

[0096] 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.

[0097] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0098] 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.).

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0104] 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.

[0105] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] The liquid electrolyte includes an electrolyte salt and a solvent.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0115] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0116] 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.

[0117] 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.

[0118] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0119] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0120] 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.

[0121] In some embodiments, the electrode assembly is a laminate structure.

[0122] 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.

[0123] 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.

[0124] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0125] 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.

[0126] 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.

[0127] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0134] 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.

[0135] 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.

[0136] In view of this, in order to improve the heat exchange efficiency and heat exchange effect of the heat exchange assembly, an embodiment of the present application provides a battery device, which includes a box assembly, a battery cell assembly and a heat exchange assembly. The box assembly has a first accommodating cavity inside. The battery cell assembly is arranged in the first accommodating cavity. The heat exchange assembly is used to exchange heat with the battery cell assembly. The heat exchange assembly includes a plurality of flexible heat exchange units and a hard current collector. The flexible heat exchange unit has a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly. The hard current collector connects and supports the plurality of flexible heat exchange units.

[0137] The battery device provided in the embodiment of the present application includes a box assembly, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the first accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. The heat exchange assembly is used to exchange heat with the battery cell assembly. On the one hand, by setting the heat exchange assembly to include multiple flexible heat exchange units and a hard current collector, the hard current collector connects and supports multiple flexible heat exchange units, that is, the heat exchange assembly can be made into a flexible heat exchange unit in the form of a standard monomer, and the corresponding flexible heat exchange unit can be selected according to the structure of the battery cell assembly to be spliced and assembled into an adapted heat exchange assembly, thereby reducing the development cycle of the heat exchange assembly and improving the research and development efficiency of the battery device; on the other hand, the flexible heat exchange unit is made of a flexible part, and the weight of the flexible part is relatively light, which is conducive to reducing the weight of the battery device and reducing the heat exchange assembly. production costs, and is beneficial to improving the energy density of the battery device; on the other hand, by setting the flexible part as a flexible structure, the flexible structure has a certain deformation ability, and the flexible part of the flexible structure can be designed according to the arrangement of the battery cell assembly and the structure of the battery device, so that the heat exchange assembly and the box assembly and / or the battery cell assembly are better fitted and adapted, which is beneficial to absorb the assembly tolerance of the heat exchange assembly, improve the fit between the heat exchange assembly and the box assembly and / or the battery cell assembly, increase the effective heat exchange area between the heat exchange assembly and the box assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] In order to meet different power requirements, the battery device includes a battery cell assembly 10, which may include multiple battery cells 11. The battery cell 11 refers to the smallest unit that constitutes a battery device module or a battery device pack. The multiple battery cells 11 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 11 are both connected in series and in parallel. The multiple battery cells 11 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 11 is accommodated in the box assembly 20; of course, the battery device 100 can also be a battery device module in which multiple battery cells 11 are first connected in series, in parallel, or in mixed connection, and the multiple battery device modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box assembly 20. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 11. Each battery cell 11 may be a secondary battery device 100 or a primary battery device 100; it may also be a lithium-sulfur battery device 100, a sodium-ion battery device 100, or a magnesium-ion battery device 100, but is not limited thereto. The battery cell 11 may be cylindrical, flat, rectangular, or in other shapes.

[0143] An embodiment of the present application provides a battery device 100, which includes a box assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The box assembly 20 has a first accommodating cavity 23 inside. The battery cell assembly 10 is arranged in the first accommodating cavity 23. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10. The heat exchange assembly 30 includes a plurality of flexible heat exchange units 41 and a hard current collector 42. The flexible heat exchange unit 41 has a medium flow channel 32 for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly 10. The hard current collector 42 connects and supports the plurality of flexible heat exchange units 41.

[0144] Please refer to Figure 2 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 .

[0145] 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.

[0146] 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 .

[0147] An embodiment of the present application provides a heat exchange assembly. The heat exchange assembly 30 is the heat exchange assembly 30 of the battery device 100 provided in the embodiment of the present application. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10 .

[0148] Here, the heat exchange component 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 component 30 and the battery cell assembly 10.

[0149] Exemplarily, the heat exchange assembly 30 further includes a connector 43 , and both ends of the flexible heat exchange unit 41 are connected to the hard current collector 42 through the connector 43 .

[0150] The heat exchange assembly 30 may include multiple flexible heat exchange units 41, multiple hard collectors 42 and multiple connectors 43. The two ends of the flexible heat exchange unit 41 are respectively connected to the hard collector 42 through the connectors 43. That is to say, by making the flexible heat exchange unit 41 into a standard monomer, the heat exchange assembly 30 is formed by splicing and assembling multiple flexible heat exchange units 41.

[0151] Here, the specific structure of the connector 43 is not limited here, and it can be, for example, a rigid connecting pipe, thereby improving the assembly efficiency between the flexible heat exchange unit 41 and the rigid current collector 42 .

[0152] The medium flow path is defined by the medium flow channel 32 and the collecting space.

[0153] Exemplarily, the flexible heat exchange unit 41 includes at least two flexible parts 31, which are stacked and at least one medium flow channel 32 is formed between the flexible parts 31. The at least one medium flow channel 32 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0154] The flexible heat exchange unit 41 includes at least two flexible parts 31 , which means that the number of flexible parts 31 included in the flexible heat exchange unit 41 may be two or more than two.

[0155] 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 properties, such as thickness, stiffness, strength, and elastic modulus. As an example, the material of the flexible member 31 can be selected to be a material that is lighter than conventional structures such as aluminum plates or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of the flexible member 31. By configuring the heat exchange assembly 30 as the flexible member 31 in the embodiment of the present disclosure, the weight of the heat exchange assembly 30 can be reduced.

[0156] A medium flow channel 32 is formed between at least two flexible members 31 , which means that the heat exchange assembly 30 forms a medium flow channel 32 between the flexible members 31 . The heat exchange medium flows through the medium flow channel 32 to achieve heat exchange with the battery cell assembly 10 .

[0157] 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.

[0158] Exemplarily, the heat exchange assembly 30 further includes an inlet 35 and an outlet 36 , both of which are in communication with the medium flow channel 32 .

[0159] Here, the inlet 35 and the outlet 36 of the heat exchange assembly 30 are used to connect to pipelines of the entire vehicle or electrical equipment.

[0160] The principle of heat exchange of the heat exchange component 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 medium flow channel through the inlet 35 of the heat exchange component 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 component 30, completing the heat exchange of the battery cell assembly 10.

[0161] Here, the heat exchange assembly 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 .

[0162] The principle of heat dissipation of the battery cell assembly 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel through the inlet 35 of the heat exchange component 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 component 30, releasing the heat, and completing the cooling and heat dissipation of the battery cell assembly 10.

[0163] The principle of the heat exchange component 30 heating the battery cell assembly 10 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel through the inlet 35 of the heat exchange component 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 component 30, completing the heating of the battery cell assembly 10.

[0164] Here, the flexible part 31 is set as a flexible structure, and the flexible part 31 has certain expandable or contractible characteristics. It can also be understood that the flexible part 31 can be an elastically deformable structure. The flexible part 31 has the ability to deform and restore deformation, so that the heat exchange component 30 can be formed into a contoured structure. The heat exchange component 30 can better adapt to the external contour shape of the battery cell or other components to improve the fit between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby improving the heat exchange efficiency.

[0165] 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.

[0166] The battery device provided in the embodiment of the present application includes a box assembly 20, a battery cell assembly 10 and a heat exchange assembly 30. The battery cell assembly 10 is arranged in the first accommodating cavity 23 of the box assembly 20, and the box assembly 20 protects the battery cell assembly 10. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10. On the one hand, by configuring the heat exchange assembly 30 to include multiple flexible heat exchange units and a hard current collector 42, the hard current collector 42 connects and supports multiple flexible heat exchange units 41. In other words, the heat exchange assembly 30 can be made into a flexible heat exchange unit 41 in the form of a standard monomer, and the corresponding flexible heat exchange unit 41 can be selected according to the structure of the battery cell assembly 10 to be spliced and assembled into an adapted heat exchange assembly 30, thereby reducing the development cycle of the heat exchange assembly 30 and improving the research and development efficiency of the battery device 100. On the other hand, the flexible heat exchange unit 41 is made of a flexible part 31, and the weight of the flexible part 31 is relatively light, which is conducive to reducing the weight of the battery device 100 and reducing the heat exchange assembly 30. 0 production cost, and is conducive to improving the energy density of the battery device 100; on the other hand, by setting the flexible part 31 to a flexible structure, the flexible structure has a certain deformation ability, and the flexible part 31 of the flexible structure can be designed according to the arrangement of the battery cell assembly 10 and the structure of the battery device 100, so that the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10 are better fitted and adapted, which is conducive to absorbing the assembly tolerance of the heat exchange component 30, improving the fit between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, and increasing the effective heat exchange area between the heat exchange component 30 and the box assembly 20 and / or the battery cell assembly 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0167] Here, the heat exchange assembly 30 can be disposed in the first accommodating cavity 23 , that is, the heat exchange assembly 30 can be in direct contact with the battery cell assembly 10 , thereby further improving the heat exchange efficiency between the heat exchange assembly 30 and the battery cell assembly 10 .

[0168] Of course, in other embodiments, a heat exchange assembly 30 may be provided on the outside of the first accommodating cavity 23 .

[0169] That is, at least a portion of the heat exchange assembly 30 is disposed outside the first accommodating cavity 23 , so as to separate the heat exchange assembly 30 from the battery cell assembly 10 .

[0170] In the related art, the heat exchange assembly and the battery cell assembly are arranged in the same space. When the heat exchange medium in the above cooling system is prone to leakage, the risk of short circuit of the battery cell assembly in the battery device box is increased, affecting the reliability of the battery device.

[0171] In this embodiment, a heat exchange assembly 30 is provided on the outside of the first accommodating cavity 23 to separate the heat exchange assembly 30 from the battery cell assembly 10, thereby reducing the risk of the heat exchange medium of the heat exchange assembly 30 leaking and contacting the battery cell assembly 10, thereby reducing the risk of short circuit of the battery device 100 and improving the reliability of the battery device 100.

[0172] 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 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.

[0173] 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 .

[0174] 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.

[0175] In other embodiments, the box assembly 20 includes a box body 21 and a bottom guard plate 22. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the outer side wall of the box body 21. A heat exchange assembly 30 is disposed in the second accommodating cavity 24.

[0176] 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.

[0177] 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 assembly 30 is arranged in the second accommodating cavity 24.

[0178] Here, the heat exchange component 30 is arranged in the second accommodating chamber 24, which means that the heat exchange component 30 can be arranged only in the second accommodating chamber 24, or the heat exchange component 30 can be arranged in other areas except the second accommodating chamber 24 in addition to being arranged in the second accommodating chamber 24.

[0179] 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.

[0180] Here, by providing the bottom guard plate 22 , the heat exchange assembly 30 can be supported and protected.

[0181] The heat exchange assembly 30 is arranged in the second accommodating cavity 24, that is, the heat exchange assembly 30 is arranged outside the first accommodating cavity 23, so as to separate the heat exchange assembly 30 from the battery cell assembly 10, thereby avoiding the heat exchange medium of the heat exchange assembly 30 from leaking and contacting the battery cell assembly 10, thereby causing the battery device 100 to short-circuit, thereby improving the safety performance and reliability of the battery device 100.

[0182] In this embodiment, a bottom guard plate 22 is provided on the outside of the box body 21 to define a second accommodating chamber 24 between the bottom guard plate 22 and the second box portion 212. The heat exchange assembly 30 is disposed within the second accommodating chamber 24 for heat exchange with the box body 21, thereby achieving heat exchange with the battery cell assembly 10 carried within the box body 21. In other words, by disposing the heat exchange assembly 30 outside the first accommodating chamber 23 of the box assembly 20, the problem of short circuiting of the battery device 100 due to leakage of the heat exchange medium from the heat exchange assembly 30 can be avoided to a certain extent, thereby improving the safety and reliability of the battery device 100, and maximizing the utilization of the accommodating chamber within the box assembly 20, thereby increasing the compactness of the battery device 100. Furthermore, by providing the bottom guard plate 22, the bottom guard plate 22 cooperates with the box body 21 to connect and protect the battery cell assembly 10, further improving the reliability of the box assembly 20.

[0183] In some embodiments, see Figures 2 to 4 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.

[0184] 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 .

[0185] 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 .

[0186] 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.

[0187] In this embodiment, the protruding connecting portion 221 forms a circle, which not only connects to the second housing portion 212 but also defines a second accommodating chamber 24 between the bottom guard plate 22 and the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 can, to a certain extent, prevent mud, sand, or water from entering the second accommodating chamber 24, thereby protecting the heat exchange assembly 30 in the second accommodating chamber 24.

[0188] 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 .

[0189] Exemplarily, the sealing member is, for example, a sealing strip.

[0190] 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.

[0191] In some embodiments, see Figures 2 to 4 Part of the bottom guard plate 22 is protruding to form a support structure 222. The support structure 222 is used to support the flexible member 31 and / or the second box portion 212.

[0192] Here, the support structure 222 is used to support the flexible member 31 and / or the second box body 212, which means that the support structure 222 is in contact with the flexible member 31 and / or the second box body 212, providing a certain supporting force to the flexible member 31 and / or the second box body 212. In other words, the support structure 222 can be used to support the flexible member 31, the second box body 212, or both the flexible member 31 and the second box body 212.

[0193] It should be noted that part of the area of the bottom guard plate 22 is protruding to form a support structure 222. This may mean that the side of the bottom guard plate 22 facing away from the box body 21 is concave, so that the side of the bottom guard plate 22 facing the box body 21 is protruding to form the support structure 222; it may also mean that the side of the bottom guard plate 22 facing away from the box body 21 is not concave, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protruded to form the support structure 222.

[0194] The support structure 222 is used to support the flexible member 31 and / or the second box portion 212 , so as to form a fixed space between the bottom guard plate 22 and the second box portion 212 , which is beneficial to improving the reliability of the battery device 100 .

[0195] In this embodiment, the bottom guard plate 22 is provided with a support structure 222 for supporting the flexible part 31 and / or the second box body part 212. This is beneficial to improving the problem of deformation of the second box body part 212 due to insufficient support strength when it is under pressure, thereby improving the problem of the second box body part 212 directly adhering to the heat exchange component 30, which causes the heat exchange component 30 to be crushed. It is beneficial to improve the stability of the thermal interface contact of the heat exchange component 30, thereby improving the thermal management performance of the heat exchange component 30.

[0196] In some embodiments, the support structure 222 abuts the flexible member 31 against the second box portion 212 to support the flexible member 31 and the second box portion 212 .

[0197] For example, in an embodiment where the support structure 222 is used to support the flexible member 31 , the support structure 222 may be supported on the surface of the flexible member 31 and cause the flexible member 31 to abut against the second box portion 212 .

[0198] In this embodiment, the flexible member 31 is abutted against the second box body portion 212 by providing a support structure 222 , which not only supports the second box body portion 212 but also fixes the heat exchange assembly 30 , thereby improving the stability of the heat exchange assembly 30 .

[0199] In some embodiments, see Figures 2 to 7 The flexible member 31 includes a hot pressing region 34 . The hot pressing region 34 is configured such that the flexible member 31 is formed by hot pressing. The hot pressing region 34 defines the interior of the flexible heat exchange unit 41 to form a medium flow channel 32 .

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

[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 defines the interior of the flexible heat exchange unit 41 to form a medium flow channel 32. This molding method is simple.

[0202] In some embodiments, see Figure 5 The heat exchange assembly 30 includes a plurality of heat exchange groups 40 arranged along a first direction. Each heat exchange group 40 includes at least one flexible heat exchange unit 41. The heat exchange medium in the flexible heat exchange units 41 of each heat exchange group 40 flows in the same direction. The heat exchange groups 40 are connected end to end, so that the heat exchange groups 40 are connected in series. The flexible heat exchange units 41 extend along a second direction, and the first direction intersects the second direction.

[0203] That is, the flexible heat exchange units 41 are first spliced and assembled into the heat exchange group 40 , and then the heat exchange group 40 is spliced and assembled into the heat exchange assembly 30 adapted to the battery cell assembly 10 .

[0204] Illustratively, the same end of the flexible heat exchange unit 41 in each heat exchange group 40 is connected to the same hard current collector 42 to achieve the same flow direction of the heat exchange medium in the flexible heat exchange unit 41 of each heat exchange group 40 .

[0205] Here, the first direction intersecting the second direction means that the first direction and the second direction are not parallel. For example, the first direction and the second direction are perpendicular to each other.

[0206] In this embodiment, the flexible heat exchange units 41 are first spliced and assembled into a heat exchange group 40, and then the heat exchange group 40 is spliced and assembled into a heat exchange assembly 30 that is compatible with the battery cell assembly 10 to form a medium flow path for the circulation of the heat exchange medium. The corresponding flexible heat exchange unit 41 can be selected according to the structure of the battery cell assembly 10 to be spliced and assembled into an adaptive heat exchange assembly 30, thereby reducing the development cycle of the heat exchange assembly 30 and improving the research and development efficiency of the battery device 100.

[0207] In some embodiments, see Figure 5 Adjacent heat exchange groups 40 are connected through hard collectors 42.

[0208] In this embodiment, the same end of adjacent heat exchange groups 40 may be connected to the same hard current collector 42 , so that the adjacent heat exchange groups 40 can be connected in series.

[0209] In some embodiments, see Figure 5 The flexible heat exchange units 41 of some adjacent heat exchange groups 40 are connected to the same hard current collector 42.

[0210] Here, the flexible heat exchange units 41 of some adjacent heat exchange groups 40 are connected with the same hard fluid collector 42, which means that the flexible heat exchange units 41 of the adjacent heat exchange groups 40 located in the middle area are connected with the same hard fluid collector 42, and one end of the two heat exchange groups 40 at the edge of the first direction and the adjacent heat exchange group 40 are not connected with the same hard fluid collector 42, and the other end and the adjacent heat exchange group 40 are connected with the same hard fluid collector 42.

[0211] In this embodiment, the same end of some adjacent heat exchange groups 40 may be connected to the same hard current collector 42 , so that the adjacent heat exchange groups 40 can be connected in series.

[0212] In some embodiments, see Figure 5 The heat exchange assembly 30 includes a first heat exchange group, a second heat exchange group, a third heat exchange group, and a fourth heat exchange group arranged in sequence along a first direction. The hard current collector 42 includes a first hard current collector, a second hard current collector, a third hard current collector, a fourth hard current collector, and a fifth hard current collector. The first end of the first heat exchange group communicates with the inlet 35 via the first hard current collector, the second end of the first heat exchange group communicates with the first end of the second heat exchange group via the second hard current collector, the second end of the second heat exchange group communicates with the first end of the third heat exchange group via the third hard current collector, the second end of the third heat exchange group communicates with the first end of the fourth heat exchange group via the fourth hard current collector, and the second end of the fourth heat exchange group communicates with the outlet 36 via the fifth hard current collector.

[0213] Exemplarily, the heat exchange assembly 30 includes a first heat exchange group, a second heat exchange group, a third heat exchange group and a fourth heat exchange group arranged in sequence along the first direction, that is, the first heat exchange group, the second heat exchange group, the third heat exchange group and the fourth heat exchange group are connected end to end in sequence.

[0214] Of course, in other embodiments, the number of heat exchange groups 40 can also be two, three, five, six or more.

[0215] The first end of the first heat exchange group is connected to the inlet 35 through the first hard current collector. The heat exchange medium flows into the collecting space of the first hard current collector through the inlet 35 and then flows into each flexible heat exchange unit 41 of the first heat exchange group from the collecting space of the first hard current collector.

[0216] The second end of the first heat exchange group is connected to the first end of the second heat exchange group through the second hard fluid collector. The heat exchange medium flows into the collection space of the second hard fluid collector through the second end of each flexible heat exchange unit 41 of the first heat exchange group, and then flows from the collection space of the second hard fluid collector into the first end of each flexible heat exchange unit 41 of the second heat exchange group, so as to realize the end-to-end connection between the first heat exchange group and the second heat exchange group.

[0217] The second end of the second heat exchange group is connected to the first end of the third heat exchange group through the third hard current collector. The heat exchange medium flows into the collection space of the third hard current collector through the second end of each flexible heat exchange unit 41 of the second heat exchange group, and then flows from the collection space of the third hard current collector into the first end of each flexible heat exchange unit 41 of the third heat exchange group, so as to realize the end-to-end connection between the second heat exchange group and the third heat exchange group.

[0218] The second end of the third heat exchange group is connected to the first end of the fourth heat exchange group through the fourth hard current collector. The heat exchange medium flows into the collection space of the fourth hard current collector through the second end of each flexible heat exchange unit 41 of the third heat exchange group, and then flows from the collection space of the fourth hard current collector into the first end of each flexible heat exchange unit 41 of the fourth heat exchange group, so as to realize the end-to-end connection between the third heat exchange group and the fourth heat exchange group.

[0219] The second end of the fourth heat exchange group is connected to the outlet 36 through the fifth hard current collector. The heat exchange medium flows into the collecting space of the fifth hard current collector through the second ends of each flexible heat exchange unit 41 of the fourth heat exchange group, and then flows out from the collecting space of the fifth hard current collector to the outlet 36.

[0220] In some embodiments, each heat exchange group 40 is provided with an independent hard current collector 42 at both ends along the second direction, and the hard current collectors 42 corresponding to some adjacent heat exchange groups 40 are connected.

[0221] Here, the independent hard current collector 42 means that the hard current collector 42 is only connected to the flexible heat exchange unit 41 of the corresponding heat exchange group 40 , and is not connected to the flexible heat exchange unit 41 of the adjacent heat exchange group 40 .

[0222] The hard current collectors 42 corresponding to some adjacent heat exchange groups 40 are connected, which means that the hard current collectors 42 corresponding to adjacent heat exchange groups 40 can be connected to achieve communication of the current collecting spaces within the hard current collectors 42 .

[0223] In this embodiment, an independent hard current collector 42 is provided at both ends of each heat exchange group 40 along the second direction. In this way, the two ends of each heat exchange group 40 can be first connected to form a whole through the independent hard current collector 42, and then the adjacent heat exchange groups 40 are connected and communicated through their respective corresponding hard current collectors 42, thereby further improving the assembly efficiency of the heat exchange component 30.

[0224] In some embodiments, the flexible heat exchange unit 41 is plugged into and matched with the hard current collector 42 .

[0225] For example, the flexible heat exchange unit 41 can be set as an integrated standard part, and the hard current collector 42 can also be set as an integrated standard part. According to the structure of the battery cell assembly 10, the corresponding flexible heat exchange unit 41 and the corresponding hard current collector 42 are selected and spliced and assembled into an adaptive heat exchange assembly 30, thereby reducing the development cycle of the heat exchange assembly 30 and improving the research and development efficiency of the battery device 100.

[0226] In this embodiment, by arranging the flexible heat exchange unit 41 and the hard current collector 42 to be plug-fitted, the connection structure is simple, and the assembly efficiency between the flexible heat exchange unit 41 and the hard current collector 42 is further improved.

[0227] In some embodiments, see Figure 6 and Figure 7 The flexible heat exchange unit 41 has a buffer cavity 37 spaced apart from the medium flow channel 32 . The medium flow channel 32 is provided with a buffer cavity 37 on at least one side along the width direction of the flexible heat exchange unit 41 .

[0228] The buffer chamber 37 is spaced apart from the medium flow channel 32 , that is, the buffer chamber 37 and the medium flow channel 32 are independent of each other, that is, the buffer chamber 37 and the medium flow channel 32 are not connected.

[0229] Here, for example, the buffer chamber 37 is formed by hot pressing while the medium flow channel 32 is formed by hot pressing.

[0230] The buffer chamber 37 is filled with gas, which can play a buffering role when the heat exchange component 30 is hit.

[0231] The buffer cavity 37 is provided on at least one side of the medium flow channel 32 along the width of the flexible heat exchange unit 41. This means that the buffer cavity 37 is provided at the edge of the medium flow channel 32, which helps to improve the buffering effect. The buffer cavity 37 can be provided on one side of the medium flow channel 32 along the width of the flexible heat exchange unit 41, or on both sides of the medium flow channel 32 along the width of the flexible heat exchange unit 41.

[0232] In this embodiment, a buffer cavity 37 is provided on at least one side of the medium flow channel 32 along the width direction of the flexible heat exchange unit 41, which can provide a buffering effect when the heat exchange assembly 30 is impacted. Furthermore, by providing the buffer cavity 37 at the edge of the medium flow channel 32, the buffering effect is improved.

[0233] In some embodiments, the thermal conductivity of the flexible member 31 on the side away from the battery cell assembly 10 is smaller than the thermal conductivity of the flexible member 31 on the side close to the battery cell assembly 10 .

[0234] In this embodiment, by setting the thermal conductivity of the flexible part 31 on the side away from the battery cell assembly 10 to be smaller than the thermal conductivity of the flexible part 31 on the side close to the battery cell assembly 10, this is beneficial to improving the heat exchange efficiency of the heat exchange assembly 30 while reducing the thermal conductivity of the flexible part 31 on the side away from the battery cell assembly 10, which is beneficial to playing a heat preservation role.

[0235] In some embodiments, the heat exchange assembly 30 further includes a recovery device for recovering the heat exchange medium in the medium flow channel.

[0236] It is understandable that since the flexible member 31 is configured as a flexible structure, it can be deformed at will. Thus, when the thermal management system is not working, the heat exchange medium in the heat exchange assembly 30 can be recovered, thereby reducing the probability of the battery device 100 short-circuiting due to leakage of the heat exchange medium, thereby improving the reliability of the battery device 100.

[0237] In this embodiment, a recovery device is provided to recover the heat exchange medium in the medium flow channel. When the thermal management system is not working, the heat exchange medium in the heat exchange assembly 30 can be recovered, thereby reducing the probability of heat exchange medium leakage causing a short circuit in the battery device 100, thereby improving the reliability of the battery device 100.

[0238] In some embodiments, the heat exchange assembly 30 further includes an inflation device for inflating air into the medium flow channel.

[0239] It can be understood that since the flexible part 31 is set as a flexible structure, it can be deformed at will. Therefore, when the thermal management system is not working, the heat exchange medium in the heat exchange component 30 can be recovered, and then the inflation device can be used to inflate the medium flow channel, which is equivalent to playing a heat insulation role, further helping to improve the thermal insulation performance of the battery device 100.

[0240] In some embodiments, the flexible member 31 is configured as a metal plasticized film.

[0241] The flexible member 31 is a single-layer or multi-layer film.

[0242] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0243] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel 32 formed between at least two metal-plasticized films, are unaffected by the extrusion process and eliminate the need for high thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the insulation properties of the heat exchange assembly 30 prevent the risk of insulation failure. The heat exchange assembly 30 also avoids any reaction with the heat exchange medium flowing within, eliminating the risk of corrosion or leakage.

[0244] Exemplarily, at least two flexible members 31 are configured as aluminum-plastic films.

[0245] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0246] 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.

[0247] 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.

[0248] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0249] Here, the number of metal layers and non-metal layers is not limited.

[0250] In this embodiment, the flexible member 31, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel 32 between at least two flexible members 31, it is unaffected by the extrusion process and eliminates the need for a high thickness requirement. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the heat exchange assembly 30 does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0251] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil.

[0252] 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.

[0253] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0254] 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.

[0255] 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.

[0256] In some embodiments, the non-metallic layer is a hot melt layer.

[0257] 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.

[0258] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] In this embodiment, by configuring the flexible member 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange assembly 30.

[0263] In some embodiments, see Figures 2 to 7 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 flexible heat exchange unit 41 to form at least one medium flow channel 32 .

[0264] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0265] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0266] In some embodiments, the isolation layer has a thickness of 6.5 μm to 100 μm.

[0267] 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.

[0268] 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.

[0269] In some embodiments, the isolation layer has a thickness of 6.5 μm to 15 μm.

[0270] 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.

[0271] 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.

[0272] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm to 20 μm.

[0273] 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.

[0274] 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.

[0275] In some embodiments, the waterproof layer has a thickness of 50 μm to 120 μm.

[0276] 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.

[0277] 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.

[0278] In some embodiments, the thickness of the flexible member 31 is 0.05 mm to 0.3 mm.

[0279] 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.

[0280] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength while the overall thickness of the heat exchange component 30 is smaller, which is beneficial to reducing the overall volume and weight of the battery device 100 and increasing the energy density of the battery device 100.

[0281] In some embodiments, the thickness of the flexible member 31 is 0.08 mm to 0.2 mm.

[0282] 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.

[0283] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 is further made smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0284] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0285] 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.

[0286] 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.

[0287] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box component 20 and / or the battery component battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery component battery cell component 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0288] It should be noted that the width of the sealing member, the thickness of the flexible member 31 , the elastic modulus of the flexible member 31 , etc. can be measured by a micrometer, a dynamometer or a vernier caliper.

[0289] 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.

[0290] 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 assembly, which is used to exchange heat with the battery cell assembly; the heat exchange assembly includes multiple flexible heat exchange units and a hard collector, the flexible heat exchange unit has a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly, and the hard collector connects and supports the multiple flexible heat exchange units.

2. The battery device according to claim 1, wherein: The heat exchange assembly includes a plurality of heat exchange groups arranged along a first direction, each of the heat exchange groups includes at least one flexible heat exchange unit, the flow direction of the heat exchange medium in the flexible heat exchange unit of each heat exchange group is the same, the heat exchange groups are connected end to end so that the heat exchange groups are connected in series, the flexible heat exchange units extend along a second direction, and the first direction intersects with the second direction.

3. The battery device according to claim 2, characterized in that Adjacent heat exchange groups are connected via the hard current collector.

4. The battery device according to claim 3, characterized in that The flexible heat exchange units of some adjacent heat exchange groups are connected to the same hard current collector.

5. The battery device according to claim 4, characterized in that The heat exchange assembly includes a first heat exchange group, a second heat exchange group, a third heat exchange group and a fourth heat exchange group arranged in sequence along a first direction, and the hard current collector includes a first hard current collector, a second hard current collector, a third hard current collector, a fourth hard current collector and a fifth hard current collector; The first end of the first heat exchange group is connected to the inlet through the first hard current collector, the second end of the first heat exchange group is connected to the first end of the second heat exchange group through the second hard current collector, the second end of the second heat exchange group is connected to the first end of the third heat exchange group through the third hard current collector, the second end of the third heat exchange group is connected to the first end of the fourth heat exchange group through the fourth hard current collector, and the second end of the fourth heat exchange group is connected to the outlet through the fifth hard current collector.

6. The battery device according to claim 3, characterized in that An independent hard current collector is provided at both ends of each heat exchange group along the second direction, and the hard current collectors corresponding to at least some adjacent heat exchange groups are connected.

7. The battery device according to claim 1, wherein: The flexible heat exchange unit is plugged into and matched with the hard current collector.

8. The battery device according to claim 1, wherein: The heat exchange assembly further includes a connector, and both ends of the flexible heat exchange unit are connected to the hard current collector through the connector.

9. The battery device according to claim 1, wherein: The flexible heat exchange unit has a buffer cavity disposed inside thereof and spaced apart from the medium flow channel, and the buffer cavity is disposed on at least one side of the medium flow channel along a width direction of the flexible heat exchange unit.

10. The battery device according to claim 1, wherein: The heat exchange assembly further includes a recovery device, which is used to recover the heat exchange medium in the medium flow channel.

11. The battery device according to claim 1, wherein: The heat exchange assembly further includes an air charging device, which is used to charge air into the medium flow channel.

12. The battery device according to claim 1, wherein: The heat exchange component is disposed in the first accommodating cavity.

13. The battery device according to claim 1, wherein: The box assembly includes a box body and a bottom guard plate. The box body includes a first box body part and a second box body part. The first accommodating cavity is formed between the first box body part and the second box body part. The second accommodating cavity is formed between the bottom guard plate and the bottom wall of the second box body part. The heat exchange assembly is arranged in the second accommodating cavity.

14. The battery device according to any one of claims 1 to 13, characterized in that: The flexible heat exchange unit includes at least two flexible parts, which are stacked and have at least one medium flow channel formed between the flexible parts. The at least one medium flow channel is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell assembly.

15. The battery device according to claim 14, characterized in that The thermal conductivity of the flexible member at a side away from the battery cell assembly is smaller than the thermal conductivity of the flexible member at a side close to the battery cell assembly.

16. The battery device according to claim 14, wherein: The at least two flexible members are configured as metal plasticized films.

17. The battery device according to claim 14, wherein: The at least two flexible members are configured as aluminum-plastic films.

18. The battery device according to claim 14, wherein: The flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence.

19. The battery device according to claim 18, wherein: The metal layer includes one of aluminum foil, copper foil and steel foil.

20. The battery device according to claim 18, wherein: The non-metallic layer includes one of polypropylene, polyvinyl chloride and polyethylene.

21. The battery device according to claim 18, wherein: The non-metallic layer is a hot-melt layer.

22. The battery device according to claim 14, wherein: The flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

23. The battery device according to claim 22, characterized in that The thickness of the isolation layer is 6.5 μm-100 μm.

24. The battery device according to claim 23, characterized in that The thickness of the isolation layer is 6.5 μm-15 μm.

25. The battery device according to claim 22, wherein: The thickness of the corrosion-resistant layer is 5 μm-20 μm.

26. The battery device according to claim 22, wherein: The thickness of the waterproof layer is 50 μm-120 μm.

27. The battery device according to claim 14, wherein: The thickness of the flexible member is 0.05mm-0.3mm.

28. The battery device according to claim 27, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

29. The battery device according to claim 14, wherein: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

30. The battery device according to claim 14, wherein: The flexible member includes a hot pressing area. The hot pressing area is configured such that the flexible member is formed by hot pressing. The hot pressing area defines an interior of the flexible heat exchange unit to form the medium flow channel.

31. The battery device according to claim 30, characterized in that The hot pressing area defines the interior of the flexible heat exchange unit to form the medium flow channels and the buffer cavity that are arranged at intervals, and the buffer cavity is provided on at least one side of the medium flow channel along the width direction of the flexible heat exchange unit.

32. A heat exchange component, characterized in that: The heat exchange component is the heat exchange component of the battery device according to any one of claims 1 to 31, and the heat exchange component is used to exchange heat with the battery cell assembly.

33. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-31 or the heat exchange component according to claim 32.

34. An energy storage device, characterized in that: Comprising the battery device according to any one of claims 1-31 or the heat exchange component according to claim 32.

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