Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a box body; the battery monomers are arranged in the box body; the heat exchange assembly is used for exchanging heat with the battery monomers; the heat exchange assembly comprises at least two composite films, and a flow channel allowing a heat exchange medium to flow is formed between the at least two composite films. Wherein each composite film comprises a corrosion-resistant layer, a heat-conducting layer and a connecting layer; the connecting layer is located on the inner side, facing the flow channel, of the heat conduction layer, and the corrosion-resistant layer is located on the outer side, deviating from the flow channel, of the heat conduction layer. The battery device and the power utilization device provided by the embodiment of the utility model have the advantage of high energy density.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] With the extensive development of new energy technologies, battery devices have been widely used. Automobiles, electric bicycles, ships, energy storage cabinets and other electrical devices usually include battery devices. During the use of battery devices, the temperature is often adjusted by heat exchange components to ensure that they work at a suitable ambient temperature, thereby extending the service life of the battery device and the charging and discharging efficiency. However, the current heat exchange components are relatively heavy, resulting in a low energy density of the battery device. Utility Model Content

[0003] Based on this, it is necessary to provide a battery device and an electrical device to address the problem of low energy density.

[0004] The first aspect of the present application provides a battery device, comprising: a box body; a battery cell arranged in the box body; and a heat exchange component for exchanging heat with the battery cell; the heat exchange component comprises at least two composite membranes, and a flow channel for heat exchange medium to flow is formed between at least two of the composite membranes; wherein each of the composite membranes comprises a corrosion-resistant layer, a heat-conducting layer and a connecting layer; the connecting layer is located on the inner side of the heat-conducting layer facing the flow channel, and the corrosion-resistant layer is located on the outer side of the heat-conducting layer away from the flow channel.

[0005] By providing a corrosion-resistant layer on the outside of the heat-conducting layer, an anti-corrosion effect can be achieved and the cracking of the internal heat-conducting layer can be improved. The heat-conducting layer can be made of a metal foil with a certain strength and good thermal conductivity. Thus, the heat-conducting layer can have good thermal conductivity and mechanical properties while effectively reducing the overall thickness and mass of the heat exchange component. By providing a connecting layer on the inside of the heat-conducting layer, the two composite films can be conveniently connected to each other to form a flow channel, thereby avoiding the use of metal welding or screw connection, which is beneficial to reducing the overall mass of the heat exchange component. Under the same size conditions, the heat exchange component of the present application can reduce 90% of the mass compared to the traditional aluminum stamping water-cooling plate, and ultimately effectively improve the energy density of the battery device.

[0006] In one embodiment, the corrosion-resistant layer is a polyamide film, a polyethylene terephthalate film or a polyimide film.

[0007] In one embodiment, the thickness of the corrosion-resistant layer is 1um-40um.

[0008] In one embodiment, the heat conductive layer is aluminum alloy foil or stainless steel foil.

[0009] In one of the embodiments, the thickness of the thermal conductive layer is 5um-120um.

[0010] In one embodiment, the connecting layer is a polypropylene film or a polyethylene film.

[0011] In one embodiment, the thickness of the connecting layer is 20um-150um.

[0012] In one embodiment, at least one of the composite films is formed with a groove by a cold forming stamping process; the groove and the adjacent composite film define the flow channel. By recessing a portion of the composite film to form a groove, the groove and the adjacent composite film together define the flow channel, which is beneficial to improving the heat exchange capacity of the heat exchange component and reducing the overall mass. On the other hand, the flow channel can be defined by the groove and the composite film, making the structure of the heat exchange component simple and reliable, and the heat exchange medium can flow in the flow channel to achieve heat exchange with the battery cell.

[0013] In one embodiment, the depth of the groove is 1 mm-10 mm.

[0014] In one embodiment, at least two of the composite films are bonded together by a heat sealing process; the heat sealing process is defined as: heating for 1 second to 20 seconds at 150°C to 250°C. In this way, the connection layers of the two composite films can be directly bonded by the heat sealing process, thereby avoiding the use of metal welding or screw connection; this is conducive to reducing the overall mass of the heat exchange component, and ultimately effectively improving the energy density of the battery device.

[0015] In one embodiment, the composite film further includes a first adhesive layer disposed between the corrosion-resistant layer and the heat-conducting layer; and / or, the composite film further includes a second adhesive layer disposed between the heat-conducting layer and the connecting layer. In this way, the first adhesive layer is used to connect the corrosion-resistant layer and the heat-conducting layer, improve the connection strength, prevent cracks, and enhance the thermal conductivity between the corrosion-resistant layer and the heat-conducting layer; the second adhesive layer is used to connect the heat-conducting layer and the connecting layer, improve the connection strength, prevent cracks, and enhance the thermal conductivity between the connecting layer and the heat-conducting layer, thereby enabling the composite film to have better mechanical properties while also having better heat exchange capacity, which is beneficial to reducing the overall thickness and mass of the heat exchange component.

[0016] In one embodiment, the battery includes a bottom guard plate and a foam filler, the bottom guard plate is arranged below the box; the heat exchange component is arranged between the box and the bottom guard plate, and the foam filler is filled between the heat exchange component, the box and the bottom guard plate. By arranging the heat exchange component between the box and the bottom guard plate, and the foam filler is filled between the heat exchange component, the box and the bottom guard plate, the bottom guard plate and the foam filler are used to jointly provide structural support and buffering functions to the heat exchange component, ensuring that the heat exchange component only needs to focus on thermal conductivity. In the design stage, a large amount of metal materials can be saved, which is conducive to the lightweight design of the heat exchange component.

[0017] In one embodiment, the battery includes a foam filler, the heat exchange component is arranged at the bottom of the box and is thermally connected to the bottom surface of the battery cell, and the foam filler is filled between the heat exchange component, the box and the battery cell. By arranging the heat exchange component to be arranged at the bottom of the box and thermally connected to the bottom surface of the battery cell, the foam filler is filled between the heat exchange component, the box and the battery cell; the bottom plate of the box and the foam filler are used to jointly provide structural support and buffering functions to the heat exchange component, which is conducive to the lightweight design of the heat exchange component; and the heat exchange component is directly thermally connected to the bottom end surface of the battery cell, so that the heat exchange component has good thermal conductivity, which can effectively ensure that the battery device works at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device.

[0018] In one embodiment, the battery includes a foam filler, the heat exchange component is thermally connected to the side of the battery cell, and the foam filler is filled between the heat exchange component and the battery cell. By arranging the heat exchange component in the box body, and directly thermally connecting the heat exchange component to the side of the battery cell with a larger area, and filling the foam filler between the heat exchange component and the battery cell, the heat exchange component does not need to provide a support function for the battery cell; and because the heat exchange component is directly thermally connected to the side of the battery cell with a larger area, the heat exchange component has good thermal conductivity, which can effectively ensure that the battery device works at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device.

[0019] In one embodiment, the heat exchange component includes a connecting film, wherein one of the composite films is attached to one side of the connecting film to form a layer of the flow channel, and another composite film is attached to the other side of the connecting film to form another layer of the flow channel; both sides of the connecting film along the thickness direction are provided with a film material of the same material as the connecting layer. In this way, the two composite films can be connected to the two sides of the connecting film respectively, and each forms a layer of flow channel. The directions of the flow channels of different layers can be independently designed, which can effectively improve the heat exchange uniformity of the heat exchange component to the battery cell, thereby ensuring that the battery device works at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device.

[0020] A second aspect of the present application provides an electrical device, comprising the above-mentioned battery device.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0023] Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0024] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0025] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0026] Figure 5 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0027] Figure 6 A front view of a heat exchange assembly provided for some embodiments of the present application.

[0028] Figure 7 A schematic cross-sectional view of a partial section of a heat exchange assembly provided in some embodiments of the present application.

[0029] Figure 8 Schematic cross-sectional view of partial sections of a heat exchange assembly provided in some other embodiments of the present application.

[0030] Fig. 9 A schematic cross-sectional view of a composite membrane provided in some embodiments of the present application.

[0031] Fig.10 Schematic diagram of the installation of the box, battery cells and heat exchange components provided in some embodiments of the present application.

[0032] Fig.11 Schematic diagram of the installation of the box, battery cells and heat exchange components provided in other embodiments of the present application.

[0033] Vehicles - 1000;

[0034] Battery 100, housing 110, first part 111, second part 112, battery module 120, battery cell 121, end cap 122, housing 123, electrode assembly 124, electrode terminal 125, controller 200, motor 300.

[0035] Heat exchange component-400, composite membrane-410, corrosion-resistant layer-411, heat-conducting layer-412, connecting layer-413, groove-414, first adhesive layer-415, second adhesive layer-416, flow channel-420, connecting membrane-430, bottom guard plate-500. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, if the technical terms "first", "second", etc. appear, these terms are only used for descriptive purposes to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the description of the embodiments of the present application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise clearly and specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" refers to more than two groups (including two groups), and if the term "multiple sheets" appears, "multiple sheets" refers to more than two sheets (including two sheets).

[0042] In the description of the embodiments of the present application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if the technical terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0046] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0047] The development of battery devices must consider multiple design factors at the same time, such as performance parameters such as energy density, discharge capacity, and charge and discharge rate. In addition, the performance of the battery device must also be considered. In related technologies, battery devices will emit heat during use, and a heat exchange device is required to ensure that the battery device operates at a suitable ambient temperature, thereby improving the performance of the battery device, extending the service life of the battery device, and improving the charging and discharging efficiency of the battery device. The heat of the battery device is transferred to the heat exchange medium through the heat exchange device, and the heat exchange medium takes away the heat to achieve the purpose of cooling the battery device.

[0048] However, current heat exchange devices often need to consider heat exchange efficiency and strength when designing. The entire device is made of metal stamping. Although it has good thermal conductivity, it has a relatively large mass, resulting in a low energy density of the battery device.

[0049] In order to alleviate the problem of low energy density, a heat exchange component can be made of a composite membrane, and a flow channel is formed between at least two of the composite membranes, and the flow channel is used for the flow of heat exchange medium; wherein each of the composite membranes includes a corrosion-resistant layer, a heat-conducting layer and a connecting layer; the connecting layer is located on the inner side of the heat-conducting layer facing the flow channel, and the corrosion-resistant layer is located on the outer side of the heat-conducting layer away from the flow channel; by arranging the corrosion-resistant layer on the outer side of the heat-conducting layer, it can play an anti-corrosion role and improve the cracking of the internal heat-conducting layer, and the heat-conducting layer can be made of a metal foil with a certain strength and good thermal conductivity, thereby making the heat-conducting layer have good thermal conductivity and mechanical properties, and effectively reducing the overall thickness and mass of the heat exchange component; and by arranging the connecting layer on the inner side of the heat-conducting layer, it is convenient to connect the two composite membranes to each other and form a flow channel, thereby avoiding the use of metal welding or screw connection, which is beneficial to reducing the overall mass of the heat exchange component and thus improving the energy density of the battery device.

[0050] The embodiments of the present application provide a battery device and an electric device, which may be, but not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, an energy storage product, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc., and the energy storage product may include an energy storage station, etc.

[0051] It should be understood that the technical solutions generally described in the embodiments of the present application are not limited to the battery devices and power-consuming devices described above, but can also be applied to all battery devices including a box and power-consuming devices using the battery devices. However, for the sake of simplicity of description, an power-consuming device in an embodiment of the present application is taken as an example of vehicle 1000.

[0052] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail 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. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0053] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0054] Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of the battery module provided in some embodiments of the present application. Figure 2 and Figure 3 In order to meet different power requirements, the battery device 100 may include a plurality of battery cells 121 and a housing 110. The battery cell 121 refers to the smallest unit constituting the battery module 120 or the battery pack. The plurality of battery cells 121 may be connected in series and / or in parallel via electrode terminals for various applications.

[0055] The box 110 is used to accommodate the battery cell 121 or the battery module 120 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 121. The box 110 can adopt a variety of structures. In some embodiments, the box 110 may include a first part 111 and a second part 112, the first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a storage space for accommodating the battery cell 121. The second part 112 may be a hollow structure with one end open, the first part 111 may be a plate-like structure, the first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 jointly define a storage space; the first part 111 and the second part 112 may also be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be in various shapes, such as a simple three-dimensional structure such as a single cuboid, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres, and the embodiments of the present application do not limit this. The material of the box 110 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin, and the embodiments of the present application do not limit this.

[0056] In the embodiment of the present application, multiple battery cells 121 can directly form a battery pack, or they can first form a battery module 120, and then the battery module 120 can form a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel or mixed together to form a whole, and then the whole formed by multiple battery cells 121 is accommodated in the box 110. Alternatively, multiple battery cells 121 can first be connected in series, parallel or mixed together to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel or mixed together to form a whole, and then accommodated in the box 110.

[0057] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing electrical connection between the plurality of battery cells 121 .

[0058] Each battery cell 121 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device or a magnesium-ion battery device, but it is not limited thereto. The battery cell 121 can be cylindrical, flat, rectangular or other shapes. The battery cell 121 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the implementation method of the present application is not limited to this. However, for the sake of simplicity, the following embodiments are all described by taking the square lithium-ion battery cell 121 as an example.

[0059] Please refer to Figure 4 , Figure 4 The schematic diagram of the exploded structure of the battery cell 121 provided in some embodiments of the present application. The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124 and other functional components.

[0060] The end cap 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cap 122 can be adapted to the shape of the shell 123 to match the shell 123. Optionally, the end cap 122 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 122 is not easily deformed when it is squeezed and collided, so that the battery cell 121 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 125 can be provided on the end cap 122. The electrode terminal 125 can be used to electrically connect to the electrode assembly 124 for outputting or inputting electrical energy of the battery cell 121. In some embodiments, the end cap 122 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold. The material of the end cap 122 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 122 to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0061] The shell 123 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can be used to accommodate the electrode assembly 124, the electrolyte and other components. The shell 123 and the end cap 122 can be independent components, and an opening can be set on the shell 123, and the internal environment of the battery cell 121 is formed by covering the opening with the end cap 122 at the opening. Without limitation, the end cap 122 and the shell 123 can also be integrated. Specifically, the end cap 122 and the shell 123 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 123, the end cap 122 covers the shell 123. The shell 123 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The shell 123 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0062] The electrode assembly 124 is a component in the battery cell 121 where an electrochemical reaction occurs. One or more electrode assemblies 124 may be contained in the housing 123. The electrode assembly 124 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 124, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device, the positive active material and the negative active material react with the electrolyte, and the pole ear connects the electrode terminal 125 to form a current loop.

[0063] Figure 5 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. Figure 6 A front view of a heat exchange assembly provided for some embodiments of the present application. Figure 7 A schematic cross-sectional view of a partial section of a heat exchange assembly provided in some embodiments of the present application. Figure 8 Schematic cross-sectional view of partial sections of a heat exchange assembly provided in some other embodiments of the present application. Fig. 9 A schematic cross-sectional view of a composite membrane provided in some embodiments of the present application. Fig.10 Schematic diagram of the installation of the box, battery cells and heat exchange components provided in some embodiments of the present application. Fig.11 Schematic diagram of the installation of the box, battery cells and heat exchange components provided in other embodiments of the present application.

[0064] A first aspect of the present application provides a battery device 100, referring to Figures 5 to 11 As shown, the battery device 100 includes: a box body 110, a battery cell 121 and a heat exchange assembly 400. The battery cell 121 is arranged in the box body 110; the heat exchange assembly 400 is used to exchange heat with the battery cell 121; the heat exchange assembly 400 includes at least two composite films 410, and a flow channel 420 for the flow of heat exchange medium is formed between the at least two composite films 410; wherein each composite film 410 includes a corrosion-resistant layer 411, a heat-conducting layer 412 and a connecting layer 413; the connecting layer 413 is located on the inner side of the heat-conducting layer 412 facing the flow channel 420, and the corrosion-resistant layer 411 is located on the outer side of the heat-conducting layer 412 away from the flow channel 420.

[0065] The box body 110 has a receiving space. The battery device 100 includes at least one battery cell 121 . The battery cell 121 is disposed in the receiving space of the box body 110 .

[0066] That the heat exchange component 400 includes at least two composite membranes 410 means that the number of composite membranes 410 included in the heat exchange component 400 may be two or more than two.

[0067] A flow channel 420 is formed between at least two composite films 410 , which means that the heat exchange assembly 400 forms the flow channel 420 between the composite films 410 . The heat exchange medium flows in the flow channel 420 to achieve heat exchange with the battery cell 121 .

[0068] The specific type of heat exchange medium is not limited here, as long as it can cool the battery cell 121, for example, it can be air, water, alcohol or glycerin. During the flow of the heat exchange medium in the heat exchange channel 420, it can effectively absorb the heat transferred from the side wall of the composite membrane 410 or transfer the heat to the composite membrane 410, and finally complete the heat exchange with the battery cell 121. In the embodiment of the present application, the heat exchange medium is described as water.

[0069] Illustratively, the number of the flow channel 420 may be one or more.

[0070] Exemplarily, the heat exchange component 400 may be a flexible water cooling plate.

[0071] Exemplarily, the heat exchange assembly 400 further includes an inlet (not labeled) and an outlet (not labeled), and both the inlet and the outlet are in communication with the flow channel 420 .

[0072] Here, the heat exchange component 400 and the battery cell 121 may perform heat exchange on the battery cell 121 to dissipate heat from the battery cell 121 or may perform heat exchange on the battery cell 121 .

[0073] The principle of heat exchange component 400 dissipating heat for battery cell 121 is as follows: the heat exchange medium output by the cold source enters the flow channel 420 through the inlet of the heat exchange component 400, absorbs the heat generated by the battery cell 121 during operation, and then flows out through the outlet of the heat exchange component 400 to release heat, thereby completing the cooling and heat dissipation of the battery cell 121.

[0074] The principle of the heat exchange component 400 heating the battery cell 121 is as follows: the heat exchange medium output by the heat source enters the medium circulation through the inlet of the heat exchange component 400, heats the battery cell 121, and then flows out through the outlet of the heat exchange component 400, absorbs heat, and completes the heating of the battery cell 121.

[0075] For ease of understanding, the following description will be made by taking the heat exchange assembly 400 dissipating heat for the battery cell 121 as an example. The heat exchange assembly 400 heats the battery cell 121 in a similar manner, which will not be described in detail herein.

[0076] See also Figures 5 to 9Each composite film 410 includes a corrosion-resistant layer 411, a heat-conducting layer 412, and a connecting layer 413, which are sequentially arranged from the outside to the inside. It can be understood that the stacking direction of the corrosion-resistant layer 411, the heat-conducting layer 412, and the connecting layer 413 is the thickness direction of the three. When the heat exchange component 400 is arranged in the box body 110, the heat exchange component 400 is connected to the box body 110 along the thickness direction, that is, the stacking direction of the corrosion-resistant layer 411, the heat-conducting layer 412, and the connecting layer 413, for heat exchange with the battery cell 121.

[0077] The connection layer 413 is located on the inner side of the heat conducting layer 412 facing the flow channel 420, and the corrosion resistant layer 411 is located on the outer side of the heat conducting layer 412 away from the flow channel 420; one corrosion resistant layer 411 may be provided on the outer side of the heat conducting layer 412 away from the flow channel 420 along the thickness direction, or multiple corrosion resistant layers 411 may be provided. One connection layer 413 may be provided on the inner side of the heat conducting layer 412 facing the flow channel 420 along the thickness direction, or multiple connection layers 413 may be provided.

[0078] In this way, by setting the corrosion-resistant layer 411 located on the outside of the heat-conducting layer 412, it can play an anti-corrosion role and improve the cracking of the corrosion-resistant layer 411 of the internal heat-conducting layer 412. The heat-conducting layer 412 can be made of a metal foil with a certain strength and good thermal conductivity. Therefore, the heat-conducting layer 412 can have good thermal conductivity and mechanical properties, and can effectively reduce the overall thickness and weight of the heat exchange component 400; and by setting the connecting layer 413 located on the inside of the heat-conducting layer 412, it is convenient to connect the two composite films 410 to each other and form a flow channel 420, thereby avoiding the use of metal welding or screw connection, which is beneficial to reducing the overall weight of the heat exchange component 400; under the same size conditions, the heat exchange component 400 of the present application can reduce 90% of the weight compared to the traditional aluminum stamping water-cooling plate, and ultimately effectively improve the energy density of the battery device 100.

[0079] In some possible embodiments, the overall thickness of the composite film 410 may be 50 um-250 um.

[0080] For example, 50um, 60um, 64um, 71um, 77um, 80um, 88um, 92um, 101um, 109um, 115um, 124um, 134um, 152um, 160um, 175um, 183um, 191um, 200um, 209um, 214um, 222um, 235um, 240um, 250um, and so on.

[0081] It can be understood that the greater the thickness of the composite film 410, the greater the weight, the larger the space occupied, and the greater the corresponding structural strength; the smaller the thickness of the composite film 410, the smaller the weight, the smaller the space occupied, and the better the corresponding thermal conductivity.

[0082] By setting the overall thickness of the composite membrane 410 to 50um-250um, the composite membrane 410 can have better heat exchange performance while further reducing the thickness and mass of the composite membrane 410, thereby helping to further reduce the occupied space and mass of the heat exchange component 400, and ultimately effectively improve the energy density of the battery device 100.

[0083] In some possible embodiments, see Figures 5 to 7 ,as well as Fig. 9 As shown, there are two composite films 410 , and the two composite films 410 are identical.

[0084] Here, the two composite films 410 being the same means that the two composite films 410 have the same composition, that is, the corrosion-resistant layer 411 , the heat-conducting layer 412 , and the connecting layer 413 arranged sequentially from the outside to the inside are of the same type and in the same quantity.

[0085] In this embodiment, by reducing the number of composite films 410 to two and making the two composite films 410 identical, the consistency of the composite films 410 is improved, the types of production materials are reduced, and the versatility and production efficiency of the composite films 410 are improved.

[0086] In some possible embodiments, the corrosion-resistant layer 411 is one or more of a polyamide film, a polyethylene terephthalate film or a polyimide film.

[0087] The material of the corrosion-resistant layer 411 is polyamide PA (Polyamide), which has high mechanical strength, wear resistance and impact resistance, and is oil-resistant, solvent-resistant and has good processing performance.

[0088] The material of the corrosion-resistant layer 411 is polyethylene terephthalate (PET), which has good mechanical strength, transparency and chemical resistance, and has good dimensional stability and is not easy to deform.

[0089] The material of the corrosion-resistant layer 411 is polyimide PI (Polyimide Film), which has excellent high temperature resistance (long-term use temperature can reach above 300°C), good flame retardancy, and excellent mechanical strength, chemical corrosion resistance and electrical insulation.

[0090] The corrosion-resistant layer 411 can be made of different materials according to actual needs, and this application does not limit this.

[0091] It is understandable that, in the case where a plurality of corrosion-resistant layers 411 are disposed on the outer side of the heat-conducting layer 412 away from the flow channel 420 along the thickness direction, the materials of the corrosion-resistant layers 411 may be the same or different.

[0092] In some possible embodiments, the thickness of the corrosion-resistant layer 411 is 1um (micrometer)-40um (micrometer). The thickness of the corrosion-resistant layer 411 can be selected to be 2um-30um according to actual needs. Specifically, the corrosion-resistant layer 411 adopts a polyamide film, and its thickness can be selected to be 10um-30um; the corrosion-resistant layer 411 adopts a polyethylene terephthalate film, and its thickness can be selected to be 2um-5um; the corrosion-resistant layer 411 adopts a polyimide film, and its thickness can be selected to be 10um-30um.

[0093] In some possible embodiments, the heat-conducting layer 412 is an aluminum alloy foil or a stainless steel foil. In this way, the heat-conducting layer 412 can have good thermal conductivity and mechanical properties, and can effectively reduce the overall thickness and mass of the heat exchange assembly 400, which is conducive to reducing the overall mass of the heat exchange assembly 400, and finally effectively improve the energy density of the battery device 100.

[0094] The heat conducting layer 412 is a metal foil structure. Exemplarily, the heat conducting layer 412 is made of 1 series aluminum alloy, 3 series aluminum alloy, 6 series aluminum alloy or 7 series aluminum alloy.

[0095] Among them, the 1 series aluminum alloy contains more than 99.00% aluminum, has good elongation and tensile strength, good electrical conductivity, thermal conductivity, corrosion resistance, and good welding performance. The main 1 series aluminum alloy grades are 1050, 1050A, 1060, 1070, and 1100.

[0096] 3 series aluminum alloy is an aluminum alloy with manganese as the main alloying element, also known as rust-proof aluminum plate. It has good corrosion resistance and good welding performance. The main 3 series aluminum alloy grades are 3003, 3004, and 3014.

[0097] Since 6 series aluminum alloys contain Mg (magnesium), Si (silicon), and Cu (copper) elements, they produce a supersaturated solid solution after quenching and solid solution treatment. In the temperature range of 180-220°C and after 120-240 minutes of artificial aging treatment, Mg2Si&CuAl2 phases can be precipitated, which is beneficial to increase the strength of the material.

[0098] Since the 7 series aluminum alloy contains Zn (zinc) and Mg (magnesium), a supersaturated solid solution is produced after quenching and solid solution treatment. In the temperature range of 180-220°C, and after 120-240 minutes of artificial aging treatment, MgZn2 phase can be precipitated, which is beneficial to increase the strength of the material. In the embodiment of the present application, the 7 series aluminum alloy is mainly composed of Zn (zinc) elements, and some Mg (magnesium) and Cu (copper) are added. MgZn2 is the main strengthening phase and has good welding performance. The 7 series aluminum alloy grades can be 7005, 7050, and 7075.

[0099] Artificial aging is a heat treatment process that involves heating a metal or alloy workpiece (such as aluminum alloy) to an appropriate temperature above room temperature after solution treatment and maintaining it for a certain period of time to change the properties of the alloy.

[0100] In some possible embodiments, the thickness of the heat-conducting layer 412 is 5um-120um. The thickness of the heat-conducting layer 412 can be selected to be 10um-100um according to actual needs. Specifically, when the heat-conducting layer 412 is made of aluminum alloy, the thickness can be selected to be 30um-80um. This ensures that the heat-conducting layer 412 has a light weight and good thermal conductivity, and at the same time ensures that the heat-conducting layer 412 has good strength for attaching the corrosion-resistant layer 411 and the connecting layer 413.

[0101] In some possible embodiments, the connection layer 413 is a polypropylene film or a polyethylene film.

[0102] The connecting layer 413 is made of polypropylene PP (Polypropylene), which has the characteristics of being light, resistant to acids, alkalis and organic solvents, having a high melting point, good mechanical toughness and good plasticity.

[0103] The connection layer 413 is made of polyethylene PE (Polyethylene), which has the characteristics of excellent chemical stability, flexibility, electrical insulation, good plasticity, etc.

[0104] The connection layer 413 is made of polypropylene PP / polyethylene PE, and can be directly heat-sealed to avoid metal welding or screw connection; it is beneficial to reduce the overall mass of the heat exchange assembly 400, and ultimately effectively improve the energy density of the battery device 100.

[0105] In some possible embodiments, the thickness of the connection layer 413 is 20um-150um. The thickness of the connection layer 413 can be selected to be 30um-100um according to actual needs. Specifically, the connection layer 413 is made of polypropylene PP, and its thickness is selected to be 30um-100um; the connection layer 413 is made of polyethylene PE, and its thickness is selected to be 30um-100um.

[0106] In some possible embodiments, see Figures 5 to 9 As shown, at least one composite film 410 is formed with a groove 414 by a cold forming stamping process; the groove 414 and the adjacent composite film 410 define a flow channel 420 .

[0107] At least one composite membrane 410 is formed with a groove 414, which means that the groove 414 can be formed in a partial area of ​​one composite membrane 410, while another adjacent composite membrane 410 has no groove 414; the groove wall of the groove 414 and the surface of the adjacent composite membrane 410 define a heat exchange channel 420.

[0108] The grooves 414 may also be formed by partial areas of two or more composite membranes 410. The grooves 414 of two or more composite membranes 410 cooperate to form the flow channel 420, or the grooves 414 cooperate with another adjacent composite membrane 410 to form the heat exchange flow channel 420.

[0109] The composite film 410 covers the groove 414 of another composite film 410 to form a flow channel 420. The groove 414 is formed by recessing a part of the composite film 410, and the groove 414 and the adjacent composite film 410 together define a heat exchange flow channel 420. On the one hand, it is beneficial to improve the heat exchange capacity of the heat exchange component 400 and reduce the overall mass. On the other hand, the heat exchange flow channel 420 can be defined by the groove 414 and the composite film 410, so that the structure of the heat exchange component 400 is simple and reliable; the heat exchange medium circulates in the heat exchange flow channel 420 to achieve heat exchange with the battery cell 121.

[0110] The composite film 410 can be formed with grooves 414 by a cold forming stamping process. The cold forming stamping process is mature and low-cost, and can effectively control the depth of the formed grooves 414, thereby effectively controlling the depth of the heat exchange flow channel 420. In other embodiments, the composite film 410 can also be formed with grooves 414 by other processes, and this application is not limited to this.

[0111] In the embodiment of the present application, the depth of the groove 414 can be 1mm-10mm. The depth of the groove 414 can also be selected to be 2mm-8mm according to actual needs. In some embodiments, the depth of the groove 414 can be set to 3mm-5mm.

[0112] In some possible embodiments, at least two composite films 410 are bonded together with the connecting layer 413 by a heat sealing process; the heat sealing process is defined as: heating for 1 second to 20 seconds at a temperature of 150° C. to 250° C.

[0113] In this way, the connection layers 413 of the two composite films 410 can be directly bonded together through a heat sealing process, thereby avoiding the use of metal welding or screw connection; this is beneficial for reducing the overall mass of the heat exchange assembly 400 and ultimately effectively improving the energy density of the battery device 100.

[0114] In the embodiment of the present application, the connecting layer 413 of the composite film 410 can be made of polypropylene PP / polyethylene PE as needed, and heated for 3 seconds to 10 seconds at 170°C-210°C to perform heat sealing, and finally the two composite films 410 are bonded together. Thus, the groove 414 can be formed into a flow channel 410, in which the heat exchange medium flows, thereby completing heat exchange with the battery cell 121.

[0115] In some other embodiments, the connection layer 413 of the two composite films 410 can be connected by gluing or pressure welding, etc., which is not limited in the present application.

[0116] In some possible embodiments, see Figures 5 to 9 As shown, the composite film 410 also includes a first adhesive layer 415 disposed between the corrosion-resistant layer 411 and the heat-conducting layer 412. The first adhesive layer 415 may be a glue layer, which is used to connect the corrosion-resistant layer 411 and the heat-conducting layer 412, improve the connection strength, prevent cracks, and enhance the thermal conductivity between the corrosion-resistant layer 411 and the heat-conducting layer 412, thereby enabling the composite film 410 to have better mechanical properties while also having better heat exchange capacity, which is beneficial to reducing the overall thickness and mass of the heat exchange component 400.

[0117] In some possible embodiments, see Figures 5 to 9 As shown, the composite film 410 further includes a second adhesive layer 416 disposed between the heat-conducting layer 412 and the connecting layer 413. Similarly, the second adhesive layer 416 may be a glue layer, which is used to connect the heat-conducting layer 412 and the connecting layer 413, improve the connection strength, prevent cracks, and enhance the thermal conductivity between the connecting layer 413 and the heat-conducting layer 412, thereby enabling the composite film 410 to have better mechanical properties while also having better heat exchange capacity, which is beneficial to reducing the overall thickness and mass of the heat exchange component 400.

[0118] Here, according to the above-mentioned embodiments, and in combination with Figures 5 to 9 As shown, the heat exchange assembly 400 includes the following multiple components:

[0119] In the first embodiment, from outside to inside, the composite film 410 is: the corrosion-resistant layer 411 is made of polyamide PA, the first adhesive layer 415, the heat-conducting layer 412 is made of aluminum alloy foil, the second adhesive layer 416, and the connecting layer 413 is made of polypropylene PP. Among them, the corrosion-resistant layer 411 is made of polyamide PA, which is wear-resistant and scratch-resistant, the heat-conducting layer 412 is an aluminum foil layer that can block oxygen and water vapor, and the connecting layer 413 is made of polypropylene PP, which is resistant to water cooling liquid, has good heat-sealing adhesion, and is overall insulated.

[0120] In the second embodiment, from outside to inside, the composite film 410 is: the corrosion-resistant layer 411 is made of polyethylene terephthalate PET, the first adhesive layer 415, the heat-conducting layer 412 is made of stainless steel foil, the second adhesive layer 416, and the connecting layer 413 is made of polyethylene PE. Among them, the corrosion-resistant layer 411 is made of polyethylene terephthalate PET to improve the corrosion resistance of the outer layer and prevent the external corrosive medium from corroding the water-cooled plate after the seal fails. The heat-conducting layer 412 is made of stainless steel foil, which can effectively resist corrosion. The connecting layer 413 is polyethylene PE, which can withstand water-cooling liquid, has good heat-sealing adhesion, and is overall insulated.

[0121] In the third embodiment, from outside to inside, the composite film 410 is: the first corrosion-resistant layer 411 is made of polyethylene terephthalate PET, the second corrosion-resistant layer 411 is made of polyamide PA, the first adhesive layer 415, the heat-conducting layer 412 is made of aluminum alloy foil, the second adhesive layer 416, and the connecting layer 413 is made of polypropylene PP. Compared with the outer layer of the first embodiment, the polyethylene terephthalate PET film is newly added to increase the corrosion resistance of the outer layer to prevent the external corrosive medium from corroding the inside after the seal fails.

[0122] In the fourth embodiment, from the outside to the inside, the composite film 410 is: the first corrosion-resistant layer 411 is made of polyimide PI, the second corrosion-resistant layer 411 is made of polyamide PA, the first adhesive layer 415, the heat-conducting layer 412 is made of aluminum alloy foil, the second adhesive layer 416, and the connecting layer 413 are made of polypropylene PP. Compared with the outer layer of the third embodiment, the polyimide PI film is used, which can be more resistant to high and low temperatures and has good thermal conductivity, and can increase the thermal conductivity of the composite film 410.

[0123] Thus, the present application adopts a laminated composite film 410 having a corrosion-resistant layer 411, a heat-conducting layer 412 and a connecting layer 413 as a heat exchange component 400; the corrosion-resistant layer 411 located on the outside of the heat-conducting layer 412 can play an anti-corrosion role and can improve the cracking of the internal heat-conducting layer 412. The heat-conducting layer 412 is made of a metal foil with a certain strength and good thermal conductivity, thereby making the heat-conducting layer 412 have good thermal conductivity and mechanical properties; by providing a connecting layer 413 located on the inner side of the heat-conducting layer 412, it is convenient to connect the two composite films 410 to each other and form a flow channel 420, thereby avoiding the use of metal welding or screw connection, which is beneficial to reducing the overall mass of the heat exchange component 400; under the same size conditions, the heat exchange component 400 of the present application can reduce 90% of the mass compared with the traditional aluminum stamping water-cooling plate, and ultimately effectively improve the energy density of the battery device 100.

[0124] In some possible embodiments, see Figures 5 to 9 As shown, the battery includes a bottom guard plate 500 and a foam filler (not shown), the bottom guard plate 500 is arranged below the box body 110; the heat exchange component 400 is arranged between the box body 110 and the bottom guard plate 500, and the foam filler is filled between the heat exchange component 400, the box body 110 and the bottom guard plate 500.

[0125] The composite membrane 410 is first formed into a groove 414 by a cold stamping process or other methods, and then the connecting layer 413 of the double-layer composite membrane 410 is bonded by heat sealing to form a flexible heat exchange component 400.

[0126] The heat exchange component 400 is arranged between the box body 110 and the bottom guard plate 500, and the foam filler is filled between the heat exchange component 400, the box body 110 and the bottom guard plate 500. The bottom guard plate 500 and the foam filler are used to provide structural support and buffering functions to the heat exchange component 400, ensuring that the heat exchange component 400 only needs to focus on thermal conductivity. During the design stage, a large amount of metal materials can be saved, which is conducive to the lightweight design of the heat exchange component 400.

[0127] In some possible embodiments, see Figures 6 to 10 As shown, the battery includes a foam filler (not shown), the heat exchange component 400 is arranged at the bottom of the box body 110 and is thermally connected to the bottom surface of the battery cell 121, and the foam filler is filled between the heat exchange component 400, the box body 110 and the battery cell 121.

[0128] The heat exchange assembly 400 is arranged at the bottom of the box body 110 and is thermally connected to the bottom surface of the battery cell 121, and the foam filler is filled between the heat exchange assembly 400, the box body 110 and the battery cell 121; thereby, the bottom plate of the box body 110 and the foam filler are used to provide structural support and buffering functions to the heat exchange assembly 400, which is beneficial to the lightweight design of the heat exchange assembly 400; and the heat exchange assembly 400 is directly thermally connected to the bottom end surface of the battery cell 121, so that the heat exchange assembly 400 has good thermal conductivity, which can effectively ensure that the battery device 100 operates at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device 100.

[0129] In some possible embodiments, see Figures 6 to 9 ,as well as Fig.11 As shown, the battery includes a foam filler (not shown), the heat exchange assembly 400 is thermally connected to the side of the battery cell 121 , and the foam filler is filled between the heat exchange assembly 400 and the battery cell 121 .

[0130] By disposing the heat exchange component 400 in the box body 110, and directly thermally connecting the heat exchange component 400 to the side of the battery cell 121 with a larger area, the foaming filler is filled between the heat exchange component 400 and the battery cell 121, so that the heat exchange component 400 does not need to provide a support function for the battery cell 121; and because the heat exchange component 400 is directly thermally connected to the side of the battery cell 121 with a larger area, the heat exchange component 400 has good thermal conductivity, which can effectively ensure that the battery device 100 operates at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device 100.

[0131] In some possible embodiments, see Figure 5 , Figure 6 , Figure 8 as well as Fig. 9 As shown, the heat exchange component 400 includes a connecting membrane 430, wherein a composite membrane 410 is attached to one side of the connecting membrane 430 to form a layer of flow channel 420, and another composite membrane 410 is attached to the other side of the connecting membrane 430 to form another layer of flow channel 420; both sides of the connecting membrane 430 along the thickness direction are provided with membrane materials of the same material as the connecting layer 413.

[0132] In this way, the two composite membranes 410 can be connected to the two sides of the connecting membrane 430 respectively, and each form a layer of flow channel 420. The flow directions of the flow channels 420 of different layers can be designed independently, which can effectively improve the uniformity of heat exchange of the heat exchange component 400 to the battery cell 121, thereby ensuring that the battery device 100 operates at a suitable ambient temperature, thereby extending the service life and charging and discharging efficiency of the battery device 100.

[0133] The two sides of the connection film 430 along the thickness direction can be made of one or more of polypropylene PP and polyethylene PE. In this way, the surface of the connection film 430 and the connection layer 413 are made of the same material, which is convenient for heat sealing connection as a whole, thereby avoiding the use of metal welding or screw connection; it is beneficial to reduce the overall mass of the heat exchange component 400, and ultimately effectively improve the energy density of the battery device 100.

[0134] A second aspect of the present application provides an electrical device, comprising the above-mentioned battery device 100, where the battery device 100 is used to provide electrical energy or store electrical energy.

[0135] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0136] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery device, characterized in that: The battery device comprises: Box (110); A battery cell (121) is arranged in the box (110); and a heat exchange component (400) for performing heat exchange with the battery cell (121); The heat exchange component (400) comprises at least two composite membranes (410), and a flow channel (420) for the heat exchange medium to flow is formed between the at least two composite membranes (410); Each of the composite films (410) comprises a corrosion-resistant layer (411), a heat-conducting layer (412), and a connecting layer (413); the connecting layer (413) is located on the inner side of the heat-conducting layer (412) facing the flow channel (420), and the corrosion-resistant layer (411) is located on the outer side of the heat-conducting layer (412) facing away from the flow channel (420).

2. The battery device according to claim 1, characterized in that: The corrosion-resistant layer (411) is a polyamide film, a polyethylene terephthalate film or a polyimide film.

3. The battery device according to claim 1, characterized in that: The thickness of the corrosion-resistant layer (411) is 1 um-40 um.

4. The battery device according to claim 1, characterized in that: The heat conducting layer (412) is aluminum alloy foil or stainless steel foil.

5. The battery device according to claim 1, characterized in that: The thickness of the heat conducting layer (412) is 5um-120um.

6. The battery device according to claim 1, characterized in that: The connecting layer (413) is a polypropylene film or a polyethylene film.

7. The battery device according to claim 1, characterized in that: The thickness of the connecting layer (413) is 20um-150um.

8. The battery device according to any one of claims 1 to 7, characterized in that: At least one of the composite films (410) is formed with a groove (414) through a cold forming stamping process; The groove (414) and the adjacent composite membrane (410) define the flow channel (420).

9. The battery device according to claim 8, characterized in that: The depth of the groove (414) is 1 mm-10 mm.

10. The battery device according to any one of claims 1 to 7, characterized in that: At least two of the composite films (410) are bonded together into one connecting layer (413) by a heat sealing process; the heat sealing process is defined as: heating for 1 second to 20 seconds in an environment of 150°C to 250°C.

11. The battery device according to any one of claims 1 to 7, characterized in that: The composite film (410) further includes a first adhesive layer (415) disposed between the corrosion-resistant layer (411) and the heat-conducting layer (412); and / or, The composite film (410) further comprises a second adhesive layer (416) arranged between the heat conductive layer (412) and the connecting layer (413).

12. The battery device according to any one of claims 1 to 7, characterized in that: The battery comprises a bottom protective plate (500) and a foaming filler, wherein the bottom protective plate (500) is arranged below the box body (110); The heat exchange component (400) is arranged between the box body (110) and the bottom protective plate (500), and the foaming filler is filled between the heat exchange component (400), the box body (110) and the bottom protective plate (500).

13. The battery device according to any one of claims 1 to 7, characterized in that: The battery comprises a foaming filler, the heat exchange component (400) is arranged at the bottom of the box (110) and is heat-conductively connected to the bottom surface of the battery cell (121), and the foaming filler is filled between the heat exchange component (400), the box (110) and the battery cell (121).

14. The battery device according to any one of claims 1 to 7, characterized in that: The battery comprises a foaming filler, the heat exchange component (400) is heat-conductively connected to the side of the battery cell (121), and the foaming filler is filled between the heat exchange component (400) and the battery cell (121).

15. The battery device according to any one of claims 1 to 7, characterized in that: The heat exchange component (400) comprises a connecting film (430), wherein one of the composite films (410) is attached to one side of the connecting film (430) to form a layer of the flow channel (420), and another of the composite films (410) is attached to the other side of the connecting film (430) to form another layer of the flow channel (420); Film materials made of the same material as the connection layer (413) are provided on both sides of the connection film (430) along the thickness direction.

16. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 15.

Images