Heat exchange assembly, battery device and electric device

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device and an electric device. The battery device comprises a box body, a heat exchange assembly and a plurality of single batteries, the plurality of single batteries are arranged in the box body; the heat exchange assembly comprises two heat exchange pieces, and at least one heat exchange piece is a flexible piece. The two heat exchange pieces are arranged in a stacked mode, and a hot-pressing area and a non-hot-pressing area are formed through hot pressing. At least one medium flow channel is formed in the non-hot-pressing area and used for being communicated with a heat exchange medium. The thickness of the heat exchange piece ranges from 0.05 mm to 0.25 mm, and the thickness of the hot pressing area ranges from 0.06 mm to 0.36 mm. According to the heat exchange assembly provided by the embodiment of the invention, the bonding force between the two heat exchange pieces, the strength of the hot pressing area and the heat exchange efficiency of the heat exchange assembly are improved, and meanwhile, the production takt of the battery device can be shortened, so that the production efficiency of the battery device is improved.

Description

Technical Field

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

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] During the use of battery devices, the individual battery cells generate heat. Excessive heat can negatively impact the performance and lifespan of the battery device. Therefore, heat exchange components are used to dissipate heat. Consequently, improving the reliability and production efficiency of heat exchange components while effectively exchanging heat between the individual battery cells has become an important research direction in this field. Utility Model Content

[0004] To address the aforementioned technical problems, embodiments of this application provide a heat exchange component, a battery device, and an electrical device, which helps to improve the reliability and production efficiency of the battery device while maintaining its heat exchange efficiency.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] A first aspect of this application provides a battery device, including:

[0007] Box;

[0008] Multiple battery cells are disposed inside the housing;

[0009] A heat exchange assembly includes two heat exchange elements, at least one of which is a flexible element. The two heat exchange elements are stacked and formed into a hot-pressed region and a non-hot-pressed region by hot pressing. The non-hot-pressed region forms at least one medium flow channel for conducting heat exchange medium.

[0010] The thickness of the heat exchanger is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed area is in the range of 0.06 mm to 0.36 mm.

[0011] The heat exchange assembly in this embodiment includes two heat exchange components. By making at least one heat exchange component a flexible component, compared to making the heat exchange component a metal component, the flexible component is lighter, which helps to reduce the weight of the heat exchange component, reduce the production cost of the heat exchange assembly, and also helps to reduce the weight of the battery device. The two heat exchange components in this embodiment are stacked and hot-pressed to form a hot-pressed region and a non-hot-pressed region. By setting the thickness of the heat exchange components to a range of 0.05mm to 0.25mm, under the same space occupation of the heat exchange assembly, the heat exchange components within this thickness range can ensure the strength of the heat exchange components while ensuring that the medium flow channel has a certain cross-sectional size, which helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange assembly. In this embodiment, by setting the thickness of the hot-pressed region to a range of 0.06mm to 0.36mm, the hot-pressed region within this thickness range can ensure the strength of the hot-pressed region while also allowing the fusion layer of the two heat exchange components to have a certain cross-sectional size. A certain thickness is used to improve the bonding force between the two heat exchange components, thereby improving the reliability of the heat exchange assembly and the battery device. In addition, the thickness of the hot-pressed area is also related to the pressure, temperature and time of hot pressing. In order to avoid over-melting, the hot pressing temperature cannot be too high. Therefore, in this embodiment, by setting the thickness of the heat exchange component to a range of 0.05mm to 0.25mm, under appropriate hot pressing temperature conditions, a hot-pressed area with a thickness in the range of 0.06mm to 0.36mm can be formed by hot pressing. This improves the bonding force between the two heat exchange components, the strength of the hot-pressed area and the heat exchange efficiency of the heat exchange assembly, while shortening the production cycle of the battery device, thereby improving the production efficiency of the battery device.

[0012] In some embodiments, the thickness of the heat exchanger is in the range of 0.1 mm to 0.18 mm.

[0013] Within this thickness range, heat exchange components can balance strength and heat exchange efficiency. Furthermore, under appropriate hot-pressing temperatures, hot-pressing can create a region with a thickness ranging from 0.06mm to 0.36mm, further balancing the strength of the hot-pressed region while shortening the production cycle of the battery device.

[0014] In some embodiments, the thickness of the hot-pressed region is in the range of 0.1 mm to 0.2 mm.

[0015] By setting the thickness of the hot-pressed region to a range of 0.1 mm to 0.2 mm, that is, the thickness of the hot-pressed region and the thickness of the fusion layer are both appropriate, the hot-pressed region within this thickness range can further shorten the production cycle of the heat exchange assembly while taking into account both the strength of the hot-pressed region and the bonding force between the two heat exchange components.

[0016] In some embodiments, the thickness of the non-hot-pressed region is in the range of 1.1 mm to 5.5 mm.

[0017] The non-thermal-pressed region within this thickness range can balance the strength of the heat exchange components while ensuring that the medium flow channel has a certain cross-sectional size, which helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange components.

[0018] In some embodiments, the dimensions of the medium flow channel in the stacking direction of the two heat exchangers are in the range of 1 mm to 5 mm.

[0019] Within this size range, the medium flow channel can ensure a certain cross-sectional size while taking into account the space occupied by the heat exchange components. This helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange components.

[0020] In some embodiments, the dimensions of the medium flow channel in the stacking direction of the two heat exchangers are in the range of 2.5 mm to 3.5 mm.

[0021] The medium flow channels within this size range can further balance the space occupied by the heat exchange components and the heat exchange efficiency.

[0022] In some embodiments, both heat exchange elements are the flexible elements, the thickness of the heat exchange element in the non-hot-pressed region is h, and the thickness of the hot-pressed region is h1, wherein the difference between 2h and h1 is in the range of 0.01mm to 0.2mm.

[0023] The fusion layer within this thickness range can balance the strength of the hot-pressed area and the bonding force between the two heat exchange components, thereby improving the reliability of the battery device.

[0024] In some embodiments, the flexible element has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a heat-sealing layer arranged sequentially, wherein the heat-sealing layer is closer to the medium flow channel than the corrosion-resistant layer.

[0025] In this embodiment, by setting the flexible component to include a corrosion-resistant layer, an isolation layer and a heat-sealing layer arranged in sequence, the heat-sealing layer is closer to the medium flow channel than the corrosion-resistant layer. This facilitates the hot-pressing connection of the flexible component and also helps to improve the reliability of the heat exchange assembly.

[0026] In some embodiments, the thickness of the heat-sealing layer is in the range of 0.02 mm to 0.15 mm.

[0027] This allows the heat-sealing layer to have a certain structural strength, improves waterproof performance, and facilitates the hot-pressing connection of flexible components through the heat-sealing layer. In other words, with a fixed thickness of the heat exchanger, it is possible to balance the overall volume, weight, connection reliability, and waterproof performance of the heat exchange assembly.

[0028] In some embodiments, the thickness of the heat-sealing layer is in the range of 0.05 mm to 0.08 mm.

[0029] In this way, the overall size, weight, connection reliability, and waterproof performance of the heat exchange components can be further balanced.

[0030] In some embodiments, the heat-sealing layer comprises one of polypropylene, polyvinyl chloride, and polyethylene.

[0031] In this embodiment, by setting the flexible component to include a corrosion-resistant layer, an isolation layer and a heat-sealing layer arranged in sequence, the heat-sealing layer is closer to the medium flow channel than the corrosion-resistant layer. This facilitates the hot-pressing connection of the flexible component and also helps to improve the reliability of the heat exchange assembly.

[0032] In some embodiments, both heat exchange components are the flexible components, the thickness of the heat seal layer in the non-hot-pressed region is h2, and the total thickness of the heat seal layer of the heat exchange assembly in the hot-pressed region is h3, wherein the difference between 2h2 and h3 is in the range of 0.2h2 to 0.8h2.

[0033] The fusion layer within this thickness range can balance the strength of the hot-pressed area and the bonding force between the two heat exchange components, thereby improving the reliability of the battery device.

[0034] A second aspect of this disclosure provides a heat exchange assembly comprising two heat exchange elements, at least one of which is a flexible element. The two heat exchange elements are stacked and formed by hot pressing into a hot-pressed region and a non-hot-pressed region. The non-hot-pressed region forms at least one medium flow channel for conducting heat exchange medium.

[0035] The thickness of the heat exchanger is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed area is in the range of 0.06 mm to 0.36 mm.

[0036] The heat exchange assembly in this embodiment includes two heat exchange components. By making at least one heat exchange component a flexible component, compared to making the heat exchange component a metal component, the flexible component is lighter, which helps to reduce the weight of the heat exchange component, reduce the production cost of the heat exchange assembly, and also helps to reduce the weight of the battery device. The two heat exchange components in this embodiment are stacked and hot-pressed to form a hot-pressed region and a non-hot-pressed region. By setting the thickness of the heat exchange components to a range of 0.05mm to 0.25mm, under the same space occupation of the heat exchange assembly, the heat exchange components within this thickness range can ensure the strength of the heat exchange components while ensuring that the medium flow channel has a certain cross-sectional size, which helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange assembly. In this embodiment, by setting the thickness of the hot-pressed region to a range of 0.06mm to 0.36mm, the hot-pressed region within this thickness range can ensure the strength of the hot-pressed region while also allowing the fusion layer of the two heat exchange components to have a certain cross-sectional size. A certain thickness is used to improve the bonding force between the two heat exchange components, thereby improving the reliability of the heat exchange assembly and the battery device. In addition, the thickness of the hot-pressed area is also related to the pressure, temperature and time of hot pressing. In order to avoid over-melting, the hot pressing temperature cannot be too high. Therefore, in this embodiment, by setting the thickness of the heat exchange component to a range of 0.05mm to 0.25mm, under appropriate hot pressing temperature conditions, a hot-pressed area with a thickness in the range of 0.06mm to 0.36mm can be formed by hot pressing. This improves the bonding force between the two heat exchange components, the strength of the hot-pressed area and the heat exchange efficiency of the heat exchange assembly, while shortening the production cycle of the battery device, thereby improving the production efficiency of the battery device.

[0037] A third aspect of this disclosure provides an electrical device, including the battery device or the heat exchange component described above.

[0038] The heat exchange assembly in this embodiment includes two heat exchange components. By making at least one heat exchange component a flexible component, compared to making the heat exchange component a metal component, the flexible component is lighter, which helps to reduce the weight of the heat exchange component, reduce the production cost of the heat exchange assembly, and also helps to reduce the weight of the battery device. The two heat exchange components in this embodiment are stacked and hot-pressed to form a hot-pressed region and a non-hot-pressed region. By setting the thickness of the heat exchange components to a range of 0.05mm to 0.25mm, under the same space occupation of the heat exchange assembly, the heat exchange components within this thickness range can ensure the strength of the heat exchange components while ensuring that the medium flow channel has a certain cross-sectional size, which helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange assembly. In this embodiment, by setting the thickness of the hot-pressed region to a range of 0.06mm to 0.36mm, the hot-pressed region within this thickness range can ensure the strength of the hot-pressed region while also allowing the fusion layer of the two heat exchange components to have a certain cross-sectional size. A certain thickness is used to improve the bonding force between the two heat exchange components, thereby improving the reliability of the heat exchange assembly and the battery device. In addition, the thickness of the hot-pressed area is also related to the pressure, temperature and time of hot pressing. In order to avoid over-melting, the hot pressing temperature cannot be too high. Therefore, in this embodiment, by setting the thickness of the heat exchange component to a range of 0.05mm to 0.25mm, under appropriate hot pressing temperature conditions, a hot-pressed area with a thickness in the range of 0.06mm to 0.36mm can be formed by hot pressing. This improves the bonding force between the two heat exchange components, the strength of the hot-pressed area and the heat exchange efficiency of the heat exchange assembly, while shortening the production cycle of the battery device, thereby improving the production efficiency of the battery device. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of the present disclosure;

[0040] Figure 2 This is an exploded perspective view of a battery device provided in an embodiment of the present disclosure;

[0041] Figure 3 This is an exploded perspective view of the heat exchange component provided in the first embodiment of this disclosure;

[0042] Figure 4 An exploded perspective view of a flexible component provided in an embodiment of this disclosure;

[0043] Figure 5 A top view of the heat exchange assembly provided in the second embodiment of this disclosure;

[0044] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0045] Figure 7for Figure 6 Enlarged view of point B in the middle.

[0046] Explanation of reference numerals in the attached figures

[0047] 10. Battery cell; 20. Housing; 21. First housing section; 22. Second housing section; 30. Heat exchange assembly; 31. Heat exchange component; 311. Flexible component; 312. Corrosion resistant layer; 313. Insulation layer; 314. Heat sealing layer; 315. Rigid component; 32. Hot-pressed area; 321. Fusion layer; 33. Non-hot-pressed area; 34. Medium flow channel; 35. Connector; 100. Battery unit; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0053] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0057] The following is a detailed description of this application.

[0058] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0059] During the use of battery devices, the individual battery cells generate heat. Excessive heat can negatively impact the performance and lifespan of the battery device. Therefore, heat exchange components are used to dissipate heat from the battery cells. Consequently, improving the reliability and production efficiency of these heat exchange components while effectively dissipating heat from the individual battery cells has become an important research direction in this field.

[0060] Therefore, in order to balance the heat exchange efficiency of the battery device with improving its reliability and production efficiency, this application provides a battery device including a housing, a heat exchange assembly, and multiple battery cells. The multiple battery cells are disposed within the housing. The heat exchange assembly includes two heat exchange elements, at least one of which is a flexible element. The two heat exchange elements are stacked and hot-pressed to form a hot-pressed region and a non-hot-pressed region. The non-hot-pressed region forms at least one medium flow channel for conducting the heat exchange medium. The thickness of the heat exchange elements is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed region is in the range of 0.06 mm to 0.36 mm.

[0061] The heat exchange assembly in this embodiment includes two heat exchange components. By making at least one heat exchange component a flexible component, compared to making the heat exchange component a metal component, the flexible component is lighter, which helps to reduce the weight of the heat exchange component, reduce the production cost of the heat exchange assembly, and also helps to reduce the weight of the battery device. The two heat exchange components in this embodiment are stacked and hot-pressed to form a hot-pressed region and a non-hot-pressed region. By setting the thickness of the heat exchange components to a range of 0.05mm to 0.25mm, under the same space occupation of the heat exchange assembly, the heat exchange components within this thickness range can ensure the strength of the heat exchange components while ensuring that the medium flow channel has a certain cross-sectional size, which helps to reduce the flow resistance of the heat exchange medium in the medium flow channel, thereby balancing the heat exchange efficiency of the heat exchange assembly. In this embodiment, by setting the thickness of the hot-pressed region to a range of 0.06mm to 0.36mm, the hot-pressed region within this thickness range can ensure the strength of the hot-pressed region while also allowing the fusion layer of the two heat exchange components to have a certain cross-sectional size. A certain thickness is used to improve the bonding force between the two heat exchange components, thereby improving the reliability of the heat exchange assembly and the battery device. In addition, the thickness of the hot-pressed area is also related to the pressure, temperature and time of hot pressing. In order to avoid over-melting, the hot pressing temperature cannot be too high. Therefore, in this embodiment, by setting the thickness of the heat exchange component to a range of 0.05mm to 0.25mm, under appropriate hot pressing temperature conditions, a hot-pressed area with a thickness in the range of 0.06mm to 0.36mm can be formed by hot pressing. This improves the bonding force between the two heat exchange components, the strength of the hot-pressed area and the heat exchange efficiency of the heat exchange assembly, while shortening the production cycle of the battery device, thereby improving the production efficiency of the battery device.

[0062] The battery device provided in this application embodiment can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0063] This application also provides an energy storage device, which includes the battery device in any embodiment of this application.

[0064] Energy storage devices can include energy storage containers, energy storage cabinets, etc.

[0065] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0067] Please see Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0068] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] Figure 2 This is an exploded perspective view of a battery device 100 provided in some embodiments of this application; the battery device 100 mentioned in the embodiments of this application may include multiple battery cells 10 for providing voltage and capacity. The multiple battery cells 10 are connected in series, parallel, or mixed via a busbar.

[0070] In some embodiments, the battery apparatus 100 may include one or more battery cell assemblies 10. A battery cell assembly 10 may include multiple battery cells 10 connected in series, parallel, or in a mixed configuration via a busbar.

[0071] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10; as an example, one or more battery cell assemblies 10 can constitute a battery module, which is formed by arranging and fixing multiple battery cell assemblies 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cell assemblies 10 together with cable ties.

[0072] In some embodiments, the battery device 100 may be a battery pack, which includes a battery case and one or more battery cell 10 assemblies housed in the battery case.

[0073] As an example, one or more battery cells 10 can constitute a battery module, and the battery cells 10 can be housed in a battery case by fixing the battery module in a battery case.

[0074] As an example, the battery cell 10 assembly can also be housed in the battery box by directly fixing multiple battery cells 10 to the battery box.

[0075] In this embodiment of the application, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0076] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] A battery cell 10 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and / or discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0078] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0079] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0080] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0081] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0082] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0083] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0085] In some embodiments, the battery cell 10 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not specifically limit the type of electrolyte and can select one according to requirements. The electrolyte can be liquid, gel, or solid.

[0086] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0087] In some embodiments, the electrode assembly has a stacked structure.

[0088] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0089] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0090] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0091] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0092] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0093] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0094] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, the battery cell 10 may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0096] As an example, the battery cell 10 can be a cylindrical battery cell 10, a prismatic battery cell 10, a pouch battery cell 10, or a battery cell 10 of other shapes. The prismatic battery cell 10 includes a square battery cell 10, a blade-shaped battery cell 10, and a multi-prismatic battery cell 10. For example, the multi-prismatic battery cell 10 is a hexagonal prismatic battery cell 10. There are no particular limitations in the embodiments of this application.

[0097] In some embodiments, a pressure relief mechanism (not shown) is provided on the housing. The pressure relief mechanism is used to release the internal pressure of the battery cell 10.

[0098] Below, refer to Figures 1 to 7 Some embodiments of this application will be described in detail.

[0099] Please see Figures 2 to 7 This application provides a battery device 100, which includes a housing 20, a heat exchange assembly 30, and a plurality of battery cells 10. The plurality of battery cells 10 are disposed within the housing 20. The heat exchange assembly 30 includes two heat exchange elements 31, at least one of which is a flexible element 311. The two heat exchange elements 31 are stacked and hot-pressed to form a hot-pressed region 32 and a non-hot-pressed region 33. The non-hot-pressed region 33 forms at least one medium flow channel 34 for conducting the heat exchange medium. The thickness of the heat exchange elements 31 is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed region 32 is in the range of 0.06 mm to 0.36 mm.

[0100] In some embodiments, the battery cell 10 includes a housing and an electrode assembly located within the housing.

[0101] In some embodiments, the housing is provided with electrode terminals, which pass through the housing and are electrically connected to the electrode assembly via tabs.

[0102] In some specific embodiments, the electrode terminals are made of conductive metal, such as copper or aluminum.

[0103] The "multiple" mentioned in the embodiments of this application refers to two or more.

[0104] The enclosure 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the enclosure 20 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0105] The housing 20 is used to encapsulate the battery cell 10. The housing 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 10.

[0106] Please see Figures 2 to 7 This application provides a heat exchange assembly 30, which includes two heat exchange elements 31, at least one of which is a flexible element 311. The two heat exchange elements 31 are stacked and formed by hot pressing to create a hot-pressed region 32 and a non-hot-pressed region 33. The non-hot-pressed region 33 forms at least one medium flow channel 34 for conducting the heat exchange medium. The thickness of the heat exchange elements 31 is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed region 32 is in the range of 0.06 mm to 0.36 mm.

[0107] Here, the flexibility in flexible component 311 refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus. As an example, the material of flexible component 311 can be selected as a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of flexible component 311. By setting the heat exchange assembly 30 to include flexible component 311 in this embodiment, it is beneficial to reduce the weight of heat exchange assembly 30.

[0108] The flexible component 311 has certain expandable or contractible characteristics. It can also be understood that the flexible component 311 can be an elastically deformable structure. The flexible component 311 has the ability to deform and recover its deformation, so that the heat exchange assembly 30 can be formed into a contour structure. The heat exchange assembly 30 can better adapt to the external contour shape of the battery cell 10 or other components, so as to improve the fit between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the housing 20 and / or the battery cell 10, and thus improving the heat exchange efficiency.

[0109] Both heat exchange components 31 can be flexible components 311, or one of the two heat exchange components 31 can be a flexible component 311 and the other can be a rigid component 315.

[0110] Two heat exchangers 31 are stacked and formed into a hot-pressed region 32 and a non-hot-pressed region 33 by hot pressing. In other words, the two heat exchangers 31 are connected by hot pressing.

[0111] The heat exchange assembly 30 forms at least one medium flow channel 34 in the non-thermal pressure region 33. The medium flow channel 34 is used to conduct the heat exchange medium. The heat exchange medium flows through the medium flow channel 34 to achieve heat exchange with the battery cell 10.

[0112] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a heat exchange effect on the battery cell 10, such as being gaseous or liquid. In this embodiment, a liquid heat exchange medium is used as an example for description.

[0113] For example, the heat exchange assembly 30 also includes an inlet and an outlet, both of which are connected to the medium flow channel 34.

[0114] Here, the inlet and outlet of the heat exchange component 30 are used to connect to the air conditioning system of the vehicle or electrical equipment, or to liquid storage devices such as water tanks.

[0115] It should be noted that the specific number of medium flow channels 34 is not limited here. There can be one or more.

[0116] The principle of heat exchange component 30 for heat exchange of battery cell 10 is as follows: the heat exchange medium output from the heat exchange medium source (not shown in the figure) enters the medium flow channel 34 through the inlet of heat exchange component 30. After the heat exchange medium exchanges heat with battery cell 10, the heat exchange medium flows out through the outlet of heat exchange component 30, thus completing the heat exchange of battery cell 10.

[0117] Here, the heat exchange component 30 can exchange heat with the battery cell 10 by either dissipating heat from the battery cell 10 or by heating the battery cell 10.

[0118] The housing 20 is used to house the battery cell 10, and the housing 20 can have various structures. See some embodiments. Figure 2 The housing 20 includes a first housing portion 21 and a second housing portion 22, which cover each other to define a receiving cavity for accommodating the battery cell 10.

[0119] Of course, the first box section 21 and the second box section 22 can be of various shapes, such as cylinders, cuboids, etc.

[0120] To improve the sealing performance after the first housing part 21 and the second housing part 22 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 21 and the second housing part 22.

[0121] Assuming that the first box section 21 covers the top of the second box section 22, the first box section 21 can also be called the upper box cover, and the second box section 22 can also be called the lower box cover.

[0122] Please see here. Figure 7 The thickness h of the heat exchanger 31 can be any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm, 0.21mm, 0.22mm, and 0.25mm, or a value between any two.

[0123] With the same space occupied by the heat exchange components 30, the greater the thickness of the heat exchange element 31, the smaller the cross-sectional size of the corresponding medium flow channel 34; conversely, the smaller the thickness of the heat exchange element 31, the larger the cross-sectional size of the corresponding medium flow channel 34. Furthermore, if the thickness of the heat exchange element 31 is too small, it will result in insufficient strength, potentially causing damage to the heat exchange element 31 during water or air filling.

[0124] The heat exchanger 31 within this thickness range can ensure that the medium flow channel 34 has a certain cross-sectional size while taking into account the strength of the heat exchanger 31. This helps to reduce the flow resistance of the heat exchange medium in the medium flow channel 34, thereby taking into account the heat exchange efficiency of the heat exchange assembly 30.

[0125] Please see Figures 5 to 7 Two heat exchange components 31 are hot-pressed to form a hot-pressed region 32 and a non-hot-pressed region 33. That is, the two heat exchange components 31 are hot-pressed together and hot-pressed to form a hot-pressed region 32 and a non-hot-pressed region 33. The non-hot-pressed region 33 forms at least one medium flow channel 34, which is used to conduct the heat exchange medium. This forming method is simple.

[0126] Here, the flexible component 311 is sealed by hot pressing. The hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0127] Here, after the two heat exchangers 31 are hot-pressed, a fusion layer 321 will be formed at the junction of the two heat exchangers 31, that is, a fusion layer 321 will be formed in the hot-pressed region 32, and the thickness of the hot-pressed region 32 is less than twice the thickness of the heat exchanger 31.

[0128] Please see Figure 7 The thickness h1 of the hot-pressed region 32 can be any one of 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.3mm, 0.32mm, 0.35mm, or 0.36mm, or a value between any two of them.

[0129] When the thickness of the heat exchanger 31 is constant, if the thickness of the fusion layer 321 is smaller, the thickness of the hot-pressed region 32 is larger. In this case, the bonding force between the two heat exchangers 31 is relatively small, and the strength of the hot-pressed region 32 is relatively large. Conversely, if the thickness of the fusion layer 321 is larger, the thickness of the hot-pressed region 32 is smaller. In this case, the bonding force between the two heat exchangers 31 is relatively large, and the strength of the hot-pressed region 32 is relatively small.

[0130] Therefore, by setting the thickness h1 of the hot-pressed region 32 to a range of 0.06 mm to 0.36 mm, the hot-pressed region 32 within this thickness range can improve the reliability of the battery device 100 by taking into account both the strength of the hot-pressed region 32 and the bonding force between the two heat exchange components 31.

[0131] It should be noted that the thickness of the hot-pressed region 32 is also related to the pressure, temperature, and time of the hot pressing. If the thickness of the heat exchanger 31 is too large, the hot pressing temperature and / or time need to be extended. To avoid over-melting, the hot pressing temperature cannot be too high. If the hot pressing temperature is too high, over-melting may occur, which may reduce the strength of the hot-pressed region 32. Therefore, under appropriate hot pressing temperature conditions, by setting the thickness of the heat exchanger 31 to the range of 0.05mm to 0.25mm, and forming the hot-pressed region 32 with a thickness of 0.06mm to 0.36mm through hot pressing, the hot pressing time can be shortened while taking into account strength, thereby shortening the production cycle of the heat exchanger assembly 30 and improving the production efficiency of the heat exchanger assembly 30.

[0132] The heat exchange assembly 30 in this embodiment includes two heat exchange elements 31. By setting at least one heat exchange element 31 as a flexible element 311, compared to setting the heat exchange element 31 as a metal element, the flexible element 311 is lighter in weight, which helps to reduce the weight of the heat exchange element 31, reduce the production cost of the heat exchange assembly 30, and also helps to reduce the weight of the battery device 100. In this embodiment, two heat exchangers 31 are stacked and hot-pressed to form a hot-pressed region 32 and a non-hot-pressed region 33. By setting the thickness of the heat exchangers 31 to a range of 0.05 mm to 0.25 mm, under the condition that the space occupied by the heat exchange assembly 30 is the same, the heat exchangers 31 within this thickness range can ensure that the medium flow channel 34 has a certain cross-sectional size while taking into account the strength of the heat exchangers 31. This is beneficial to reducing the flow resistance of the heat exchange medium in the medium flow channel 34, thereby taking into account the heat exchange efficiency of the heat exchange assembly 30. In this embodiment, by setting the thickness of the hot-pressed region 32 to a range of 0.06 mm to 0.36 mm, the hot-pressed region 32 within this thickness range can take into account the strength of the hot-pressed region 32, and also make the fusion layer 321 of the two heat exchangers 31... Having a certain thickness helps to improve the bonding force between the two heat exchange components 31, thereby improving the reliability of the heat exchange assembly 30 and the battery device 100. In addition, the thickness of the hot-pressed region 32 is also related to the pressure, temperature and time of hot pressing. In order to avoid over-melting, the hot pressing temperature cannot be too high. Therefore, in this embodiment, by setting the thickness of the heat exchange component 31 to the range of 0.05mm to 0.25mm, under appropriate hot pressing temperature conditions, a hot-pressed region 32 with a thickness in the range of 0.06mm to 0.36mm can be formed by hot pressing. While improving the bonding force between the two heat exchange components 31, the strength of the hot-pressed region 32 and the heat exchange efficiency of the heat exchange assembly 30, it can also shorten the production cycle of the battery device 100, thereby improving the production efficiency of the battery device 100.

[0133] In some embodiments, please refer to Figure 7 The thickness h of the heat exchanger 31 is in the range of 0.1 mm to 0.18 mm.

[0134] Here, the thickness of the heat exchanger 31 can be any one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, or 0.18mm, or any value between two of them.

[0135] The heat exchanger 31 within this thickness range can balance the strength of the heat exchanger 31 and the heat exchange efficiency of the heat exchange assembly 30. Furthermore, under appropriate hot-pressing temperature conditions, a hot-pressed region 32 with a thickness ranging from 0.06 mm to 0.36 mm can be formed by hot pressing, which can further balance the strength of the hot-pressed region 32 while further shortening the production cycle of the battery device 100.

[0136] In some embodiments, please refer to Figure 7 The thickness h1 of the hot-pressed region 32 is in the range of 0.1 mm to 0.2 mm.

[0137] The thickness of the hot-pressed area 32 can be any one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.2mm, or any value between two of them.

[0138] By setting the thickness of the hot-pressed region 32 to a range of 0.1 mm to 0.2 mm, that is, the thickness of the hot-pressed region 32 and the thickness of the fusion layer 321 are both appropriate, the hot-pressed region 32 within this thickness range can further shorten the production cycle of the heat exchange assembly 30 while taking into account both the strength of the hot-pressed region 32 and the bonding force between the two heat exchange components 31.

[0139] In some embodiments, please refer to Figure 7 The dimension h6 of the medium flow channel 34 in the stacking direction of the two heat exchange elements 31 is in the range of 1 mm to 5 mm.

[0140] The dimension of the medium flow channel 34 in the stacking direction of the two heat exchange elements 31 can be any one of 1mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.6mm, 3.7mm, 4mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 5mm or any value between two of them.

[0141] The smaller the cross-sectional size of the medium flow channel 34, the greater the flow resistance of the heat exchange medium; conversely, the larger the cross-sectional size of the medium flow channel 34, the smaller the flow resistance of the heat exchange medium.

[0142] Within this size range, the medium flow channel 34 can ensure a certain cross-sectional size while taking into account the space occupied by the heat exchange component 30. This helps to reduce the flow resistance of the heat exchange medium in the medium flow channel 34, thereby balancing the heat exchange efficiency of the heat exchange component 30.

[0143] In some embodiments, please refer to Figure 7 The dimensions of the medium flow channel 34 in the stacking direction of the two heat exchangers 31 are in the range of 2.5 mm to 3.5 mm.

[0144] The dimension of the medium flow channel 34 in the stacking direction of the two heat exchange elements 31 can be any one of 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm or any value between two of them.

[0145] The medium flow channel 34 within this size range can further balance the space occupied by the heat exchange component 30 and the heat exchange efficiency.

[0146] In some embodiments, please refer to Figure 7 The thickness h7 of the non-hot-pressed region 33 is in the range of 1.1 mm to 5.5 mm.

[0147] It should be noted that the non-hot-pressed region 33 refers to all regions other than the hot-pressed region 32, and includes the medium flow channel 34 and the non-flow channel region.

[0148] The thickness of the non-thermopressed region 33 at the medium flow channel 34 is equivalent to the sum of the dimension of the medium flow channel 34 in the thickness direction of the heat exchange component 30 and the thickness dimensions of the two heat exchange elements 31.

[0149] The thickness of the non-hot-pressed region 33, located in the non-flow channel region, is equivalent to the sum of the thicknesses of the two heat exchanger elements 31.

[0150] The non-thermal-pressed region 33 within this thickness range can ensure the strength of the heat exchange component 30 while maintaining a certain cross-sectional size for the medium flow channel 34. This helps to reduce the flow resistance of the heat exchange medium in the medium flow channel 34, thereby balancing the heat exchange efficiency of the heat exchange component 30.

[0151] In some embodiments, both heat exchange elements 31 are flexible elements 311, the thickness of the heat exchange element 31 in the non-hot-pressed region 33 is h, and the thickness of the hot-pressed region 32 is h1, wherein the difference between 2h and h1 is in the range of 0.01mm to 0.2mm.

[0152] Here, the thickness of the two heat exchanger elements 31 stacked together is 2h, and the thickness of the heat exchanger assembly 30 located in the hot-pressing region 32 is h1. Since the hot-pressing region 32 formed by the hot pressing of the two heat exchanger elements 31 will form a fusion layer 321 at the junction of the two heat exchanger elements 31, the thickness h1 of the hot-pressing region 32 is less than the total thickness 2h of the two heat exchanger elements 31, and the thickness h5 of the fusion layer 321 is equal to 2h minus h1.

[0153] The difference between 2h and h1 is in the range of 0.01mm to 0.2mm, which means that the thickness of the fusion layer 321 is in the range of 0.01mm to 0.2mm.

[0154] The thickness of the fusion layer 321 can be any one of 0.01mm, 0.05mm, 0.06mm, 0.08mm, 0.09mm, 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.16mm, 0.18mm, or 0.2mm, or any value between two of them.

[0155] When the thickness of the heat exchanger 31 is constant, if the thickness of the fusion layer 321 is smaller, the thickness of the hot-pressed region 32 is larger. In this case, the bonding force between the two heat exchangers 31 is relatively small, and the strength of the hot-pressed region 32 is relatively large. Conversely, if the thickness of the fusion layer 321 is larger, the thickness of the hot-pressed region 32 is smaller. In this case, the bonding force between the two heat exchangers 31 is relatively large, and the strength of the hot-pressed region 32 is relatively small.

[0156] Therefore, by setting the thickness of the fusion layer 321 to be in the range of 0.01 mm to 0.2 mm, the fusion layer 321 within this thickness range can take into account both the strength of the hot-pressed region 32 and the bonding force between the two heat exchange components 31, thereby improving the reliability of the battery device 100.

[0157] In some embodiments, please refer to Figure 4 The flexible component 311 has a layered structure and includes a corrosion-resistant layer 312, an isolation layer 313 and a heat-sealing layer 314 arranged sequentially. The heat-sealing layer 314 is closer to the medium flow channel 34 than the corrosion-resistant layer 312.

[0158] Here, the corrosion-resistant layer 312 can be a nylon layer made of nylon material, thus having certain corrosion resistance, such as resistance to acid and alkali corrosion.

[0159] The isolation layer 313 can be a metal layer, which can be one or more of aluminum foil, copper foil and steel foil, so that the flexible part 311 has a certain structural strength and can play an isolation role.

[0160] The heat-sealing layer 314 can be a non-metallic layer.

[0161] For example, the heat-sealing layer 314 includes one of polypropylene, polyvinyl chloride, and polyethylene. This allows the flexible element 311 to have a certain degree of waterproofing, and the flexible element 311 can be heat-pressed to another heat exchange element 31 through the heat-sealing layer 314.

[0162] In this embodiment, the flexible component 311 is configured to include a corrosion-resistant layer 312, an isolation layer 313, and a heat-sealing layer 314 arranged sequentially. The heat-sealing layer 314 is closer to the medium flow channel 34 than the corrosion-resistant layer 312. This facilitates the hot-pressing connection of the flexible component 311 and also helps to improve the reliability of the heat exchange assembly 30.

[0163] In some embodiments, the thickness of the heat-sealing layer 314 is in the range of 0.02 mm to 0.15 mm.

[0164] The thickness of the heat-sealing layer 314 can be any one of 0.02mm, 0.03mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, or 0.15mm, or any value between two of them.

[0165] In this embodiment, by setting the thickness of the heat-sealing layer 314 to a range of 0.02 mm to 0.15 mm, the heat-sealing layer 314 can have a certain structural strength, improve waterproof performance, and facilitate the hot-pressing connection of the flexible component 311 through the heat-sealing layer 314. That is, with a certain thickness of the heat exchange component 31, the overall volume, overall weight, connection reliability, and waterproof performance of the heat exchange assembly 30 can be balanced.

[0166] In some embodiments, the thickness of the heat-sealing layer 314 is in the range of 0.05 mm to 0.08 mm.

[0167] In this way, the overall size, weight, connection reliability, and waterproof performance of the heat exchange component 30 can be further balanced.

[0168] In some embodiments, both heat exchange components 31 are flexible components 311, the thickness of the heat sealing layer 314 in the non-hot-pressed region 33 is h2, and the total thickness of the heat sealing layer 314 in the hot-pressed region 32 of the heat exchange component 30 is h3, wherein the difference between 2h2 and h3 is in the range of 0.2h2 to 0.8h2.

[0169] Here, the thickness of the two heat-sealing layers 314 stacked together is 2h2, and the total thickness of the heat-sealing layer 314 of the heat exchange component 30 located in the hot-pressing region 32 is h3. Since the hot-pressing region 32 formed by the hot pressing of the two heat exchange components 31 will form a fusion layer 321 at the junction of the heat-sealing layers 314 of the two heat exchange components 31, the total thickness h3 of the heat-sealing layer 314 in the hot-pressing region 32 is less than the total thickness 2h of the two heat-sealing layers 314, and the thickness h5 of the fusion layer 321 is equal to 2h2 minus h3.

[0170] The difference between 2h2 and h3 is in the range of 0.2h2 to 0.8h2, which means that the thickness of the fusion layer 321 is in the range of 0.2h2 to 0.8h2.

[0171] When the thickness of the heat exchanger 31 is constant, if the thickness of the fusion layer 321 is smaller, the thickness of the hot-pressed region 32 is larger. In this case, the bonding force between the two heat exchangers 31 is relatively small, and the strength of the hot-pressed region 32 is relatively large. Conversely, if the thickness of the fusion layer 321 is larger, the thickness of the hot-pressed region 32 is smaller. In this case, the bonding force between the two heat exchangers 31 is relatively large, and the strength of the hot-pressed region 32 is relatively small.

[0172] Therefore, by setting the thickness of the fusion layer 321 to be in the range of 0.2h2 to 0.8h2, the fusion layer 321 within this thickness range can take into account both the strength of the hot-pressed region 32 and the bonding force between the two heat exchange components 31, thereby improving the reliability of the battery device 100.

[0173] In some embodiments, please refer to Figure 3 One of the two heat exchange elements 31 is a flexible element 311, and the other is a rigid element 315. On a projection plane parallel to the rigid element 315, the orthographic projection of the flexible element 311 is located within the orthographic projection range of the rigid element 315, and the orthographic projection area of ​​the flexible element 311 is smaller than the orthographic projection area of ​​the rigid element 315.

[0174] As an example, the material of rigid component 315 can be selected as a metal plate such as conventional aluminum plate or steel plate, or a material with a composite material structure, and its rigidity can be controlled by the thickness, width, length and type of material of rigid component 315.

[0175] As an example, the strength of rigid member 315 is greater than the strength of flexible member 311.

[0176] By making the projected area of ​​the flexible component 311 smaller than that of the rigid component 315, the rigid component 315 can be connected to the housing 20 through the area where the flexible component 311 is not provided. The flexible component 311 can avoid the connection area between the rigid component 315 and the housing 20, thereby avoiding damage to the flexible component 311 and improving the reliability of the heat exchange assembly 30.

[0177] The rigid component 315 can be welded to the housing 20, which can, to some extent, prevent the flexible component 311 from being damaged by heat.

[0178] The rigid component 315 and the housing 20 can be fastened together. For example, they can be fastened together by fasteners such as bolts, screws or rivets, which can avoid the influence of fasteners on the flexible component 311 to a certain extent.

[0179] For example, please refer to Figure 3 The heat exchange assembly 30 also includes a connector 35 having an inlet and a connector 35 having an outlet.

[0180] For example, the connector 35 may be connected to the rigid member 315 or to the flexible member 311.

[0181] For example, the connector 35 is brazed to the rigid member 315.

[0182] For example, connector 35 is a water tap.

[0183] For example, one of the two heat exchangers 31 has a flat side facing away from the other heat exchanger 31. The heat exchange assembly 30 contacts the battery cell 10 through the flat side, which helps to increase the contact area and thus improve the heat exchange efficiency of the heat exchange assembly 30.

[0184] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery device, characterized in that, include: Box; Multiple battery cells are disposed inside the housing; A heat exchange assembly includes two heat exchange elements, at least one of which is a flexible element. The two heat exchange elements are stacked and formed into a hot-pressed region and a non-hot-pressed region by hot pressing. The non-hot-pressed region forms at least one medium flow channel for conducting heat exchange medium. The thickness of the heat exchanger is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed area is in the range of 0.06 mm to 0.36 mm.

2. The battery device according to claim 1, characterized in that, The thickness of the heat exchanger is in the range of 0.1 mm to 0.18 mm.

3. The battery device according to claim 1, characterized in that, The thickness of the hot-pressed area is in the range of 0.1 mm to 0.2 mm.

4. The battery device according to claim 1, characterized in that, The thickness of the non-hot-pressed area is in the range of 1.1 mm to 5.5 mm.

5. The battery device according to claim 1, characterized in that, The dimensions of the medium flow channel in the stacking direction of the two heat exchangers are in the range of 1 mm to 5 mm.

6. The battery device according to claim 5, characterized in that, The dimensions of the medium flow channel in the stacking direction of the two heat exchangers are in the range of 2.5 mm to 3.5 mm.

7. The battery device according to claim 1, characterized in that, Both heat exchange components are flexible components. The thickness of the heat exchange component in the non-hot-pressed region is h, and the thickness of the hot-pressed region is h1. The difference between 2h and h1 is in the range of 0.01mm to 0.2mm.

8. The battery device according to claim 1, characterized in that, The flexible component has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a heat-sealing layer arranged sequentially, wherein the heat-sealing layer is closer to the medium flow channel than the corrosion-resistant layer.

9. The battery device according to claim 8, characterized in that, The thickness of the heat-sealing layer is in the range of 0.02 mm to 0.15 mm.

10. The battery device according to claim 9, characterized in that, The thickness of the heat-sealing layer is in the range of 0.05 mm to 0.08 mm.

11. The battery device according to claim 8, characterized in that, The heat-sealing layer comprises one of polypropylene, polyvinyl chloride, and polyethylene.

12. The battery device according to claim 8, characterized in that, Both heat exchange components are flexible components. The thickness of the heat sealing layer in the non-hot-pressed region is h2, and the total thickness of the heat sealing layer in the hot-pressed region of the heat exchange assembly is h3. The difference between 2h2 and h3 is in the range of 0.2h2 to 0.8h2.

13. A heat exchange component, characterized in that, The heat exchange assembly includes two heat exchange elements, at least one of which is a flexible element. The two heat exchange elements are stacked and formed into a hot-pressed region and a non-hot-pressed region by hot pressing. The non-hot-pressed region forms at least one medium flow channel for conducting the heat exchange medium. The thickness of the heat exchanger is in the range of 0.05 mm to 0.25 mm, and the thickness of the hot-pressed area is in the range of 0.06 mm to 0.36 mm.

14. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 12 or the heat exchange component according to claim 13.

Images