Heat exchange assembly, battery device and electric equipment

Abstract

The embodiment of the invention provides a heat exchange assembly, a battery device and electric equipment. The battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly, the heat exchange assembly comprises at least two heat exchange parts, at least one heat exchange part is arranged to be a flexible part, at least one heat exchange part is arranged to be a rigid part, at least one of the flexible part and the rigid part comprises a hot melting layer, the hot melting layer is connected to the other one of the rigid part and the flexible part, at least one of the rigid part and the flexible part is provided with a connecting structure, and the connecting structure is connected with the hot melting layer. The connecting structure is connected to the hot melting layer and comprises at least one of a roughening layer, a frosted layer and a reinforcing layer. The heat exchange assembly of the battery device provided by the embodiment of the invention comprises the flexible part and the rigid part, the rigid part and the flexible part are connected through the hot melting layer, and at least one of the rigid part and the flexible part is provided with the connecting structure connected to the hot melting layer, so that improvement of the connecting strength of the rigid part and the flexible part is facilitated, and the use reliability is further improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a heat exchange component, a battery device and an electrical equipment. Background Art

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, a heat exchange component is usually set in the battery device. A heat exchange medium is usually set in the heat exchange component to achieve heat exchange. How to reduce the risk of heat exchange medium leakage is an important research direction in this field. Summary of the invention

[0003] In view of this, embodiments of the present application hope to provide a heat exchange component, a battery device and an electrical equipment.

[0004] The first aspect of an embodiment of the present application provides a battery device, which includes: a box body; a plurality of battery cells, wherein the plurality of battery cells are arranged in the box body; a heat exchange assembly, wherein the heat exchange assembly includes at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part, wherein the flexible part and the rigid part are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; wherein at least one of the flexible part and the rigid part includes a hot melt layer, wherein the hot melt layer is connected to the other of the rigid part and the flexible part, and wherein at least one of the rigid part and the flexible part has a connecting structure, wherein the connecting structure is connected to the hot melt layer, and wherein the connecting structure includes at least one of a roughened layer, a frosted layer, and a reinforcing layer.

[0005] In the battery device provided in the embodiment of the present application, at least one heat exchange component of the heat exchange assembly is configured as a flexible component. The flexible component is light in weight, which helps to reduce the weight of the heat exchange assembly and thereby improve the energy density of the battery device.

[0006] On the other hand, the flexible parts have a certain flexibility, which can make the heat exchange component fit better with the casing and / or battery cells, thereby absorbing the assembly tolerance of the heat exchange component without the use of fillers or thermal conductive materials, thereby improving the fit between the heat exchange component and the casing and / or battery cells, and increasing the effective heat exchange area between the heat exchange component and the casing and / or battery cells, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0007] On the other hand, by setting at least one heat exchange component as a rigid component, the flexible component and the rigid component are stacked to form at least one medium flow channel, the rigid component can support the flexible component, which is beneficial to improving the overall structural strength and stability of the heat exchange component, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange component; in addition, by setting the rigid component, the heat exchange component has sufficient structural strength to carry the battery cell, thereby improving the applicability of the heat exchange component.

[0008] On the other hand, the flexible part and the rigid part are connected by a hot melt layer, and the temperature during connection (150℃±10℃) is lower than the brazing temperature in the related art, and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component. In addition, at least one of the flexible part and the rigid part has a connecting structure, which can improve the strength of the connection with the hot melt layer, thereby improving the connection strength between the flexible part and the rigid part, reducing the risk of leakage of the heat exchange medium, and improving the reliability of use.

[0009] In some embodiments, the connection structure includes a textured layer, and at least the rigid component is provided with the textured layer.

[0010] In this embodiment, by configuring the connection structure as a roughened layer, it helps to further enhance the connection strength of the connection structure, thereby helping to further enhance the reliability of the heat exchange component.

[0011] In some embodiments, the textured layer forms a connecting groove, and the hot-melt layer at least partially fills the connecting groove.

[0012] In this embodiment, by forming a connection groove in the roughened layer, the contact area between the hot melt layer and the rigid component is greatly increased, thereby improving the connection strength between the hot melt layer and the roughened layer, thereby improving the reliability of the heat exchange component.

[0013] In some embodiments, the connecting groove has an opening portion and an expansion portion connected to the opening portion, the opening portion is arranged toward the hot melt layer, and in a projection plane perpendicular to the stacking direction of the flexible part and the rigid part, a projection area of ​​the opening portion is smaller than a projection area of ​​the expansion portion.

[0014] In this embodiment, by setting the connecting groove into the above-mentioned shape, on the one hand, it helps to further increase the contact area between the rigid part and the hot melt layer, and on the other hand, it helps to improve the restraining ability of the connecting groove on the hot melt layer filled therein. In summary, it helps to further improve the connection strength.

[0015] In some embodiments, there are multiple connecting grooves, and the multiple connecting grooves are arranged in parallel or staggered.

[0016] In this embodiment, the parallel arrangement of multiple connection grooves helps to improve the connection strength while minimizing the impact on the structural strength of the rigid part / flexible part. The staggered arrangement of multiple connection grooves helps to obtain a larger contact area and further improve the connection strength.

[0017] In some embodiments, the connection structure includes a frosted layer, and at least the rigid member is provided with the frosted layer.

[0018] In this embodiment, the connection structure includes a frosted layer, which helps to increase the contact area with the hot melt layer, thereby helping to improve the connection strength. In addition, compared with the roughened layer, the frosted layer helps to reduce manufacturing difficulty and cost and improve production efficiency.

[0019] In some embodiments, the frosted layer is configured as a chemical etching layer, or the frosted layer is configured as a sandblasting layer.

[0020] In this embodiment, by setting the frosted layer as a chemical etching layer or a sandblasting layer, it helps to further reduce the manufacturing difficulty and cost.

[0021] In some embodiments, the rigid member is a metal plate.

[0022] In this embodiment, by setting the rigid member as a metal plate, the metal plate can still have good structural strength and good thermal conductivity while forming the above-mentioned frosted layer and / or roughened layer.

[0023] In some embodiments, the connection structure includes a reinforcement layer, the flexible member includes a metal layer and the reinforcement layer stacked together, and the reinforcement layer connects the metal layer and the hot melt layer.

[0024] In this embodiment, a reinforcing layer is provided in the flexible member, which, on the one hand, helps to improve the connection strength between the flexible member and the hot melt layer, thereby improving the connection strength between the flexible member and the rigid member. On the other hand, it also helps to improve the structural strength of the flexible member itself, thereby improving the durability of the heat exchange assembly.

[0025] In some embodiments, the reinforcement layer is a non-metallic material layer.

[0026] In this embodiment, the reinforcement layer is configured as a non-metallic material layer, which helps to reduce the weight of the flexible part as much as possible while improving the connection strength and the structural strength of the flexible part itself, thereby helping to improve the energy density of the battery device.

[0027] In some embodiments, the reinforcement layer includes one of polar group modified polypropylene, glass fiber, and carbon fiber.

[0028] In this embodiment, the reinforcing layer made of the above-mentioned selected materials helps to further improve the connection strength and the structural strength of the flexible member, and reduce the weight of the flexible member.

[0029] In some embodiments, the metal layer includes one of aluminum foil, copper foil and steel foil.

[0030] In this embodiment, the metal layer selected in this way can make the flexible component have a certain structural strength and can play an isolation role.

[0031] In some embodiments, the flexible member comprises a metal plasticized film.

[0032] In this embodiment, since the metal plastic film is thin and light, and a medium flow channel is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced.

[0033] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0034] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0035] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0036] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while making the overall thickness of the heat exchange component smaller, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0037] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0038] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and has a certain deformation ability, which can improve the fit between the heat exchange component and the case and / or battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the case and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0039] The second aspect of the embodiment of the present application provides a heat exchange component, which includes at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part. The flexible part and the rigid part are stacked to form at least one medium flow channel, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a battery cell; wherein at least one of the flexible part and the rigid part includes a hot melt layer, and the hot melt layer is connected to the other of the rigid part and the flexible part, and at least one of the rigid part and the flexible part has a connecting structure, and the connecting structure is connected to the hot melt layer, and the connecting structure includes at least one of a roughened layer, a frosted layer, and a reinforced layer.

[0040] A third aspect of the embodiments of the present application provides an electrical device, which includes the battery device of the first aspect of the embodiments of the present application, or the heat exchange component of the second aspect of the embodiments of the present application.

[0041] The heat exchange assembly and electrical equipment of the embodiments of the present application have all the advantages of the battery device described in any of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application; Figure 2 A three-dimensional exploded schematic diagram of a battery device provided in one embodiment of the present application; Figure 3 A schematic diagram of the axial structure of a heat exchange assembly provided in one embodiment of the present application; Figure 4 A three-dimensional exploded schematic diagram of a heat exchange assembly provided in one embodiment of the present application; Figure 5 for Figure 3 A partial schematic diagram of the AA section of the heat exchange component; Figure 6 A schematic diagram of the structure of a rigid member provided in one embodiment of the present application; Figure 7 for Figure 6 A partial enlarged schematic diagram of part B of the middle rigid part.

[0043] Description of Reference Numerals 1000, vehicle; 100, battery device; 10, battery cell; 20, box body; 21, box body; 211, side beam; 22, top cover; 23, bottom guard plate; 30, heat exchange component; 30a, medium flow channel; 30b, inlet; 30c, outlet; 30d, hot pressing area; 31, flexible part; 311, metal layer; 312, reinforcement layer; 313, insulation layer; 32, rigid part; 321, roughened layer; 322, connecting groove; 322a, opening; 322b, expansion part; 33, connecting part; 34, hot melt layer; 35, connecting structure; 200, controller; 300, motor. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0046] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0047] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0048] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0051] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0052] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0053] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries 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.

[0054] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0055] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0056] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0057] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0058] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0059] In some embodiments, the electrode assembly is a laminate structure.

[0060] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0061] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0062] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0063] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0064] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0065] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0066] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0067] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0068] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0069] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0070] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0071] During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while reducing the weight of the heat exchange component has become an important research direction in this field. In the related art, the battery cells in the battery device are cooled by providing a cooling system in the battery device box. The above-mentioned cooling system may include a plurality of aluminum water-cooling plates laid in the battery device box, and the surfaces of the plurality of water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned plurality of water-cooling plates, thereby taking away the heat from the battery cells and cooling the battery cells. However, the aluminum water-cooling plates in the above-mentioned cooling system have problems such as heavy weight and the risk of leakage of the heat exchange medium.

[0072] In view of this, in order to reduce the weight of the heat exchange component and the risk of heat exchange medium leakage and improve the reliability of use, an embodiment of the present application provides a battery device, which includes a box, a plurality of battery cells and a heat exchange component. The plurality of battery cells are arranged in the box, and the heat exchange component includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part, and at least one heat exchange part is set as a rigid part. The flexible part and the rigid part are stacked to form at least one medium flow channel, and the at least one medium flow channel is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells, wherein at least one of the flexible part and the rigid part includes a hot melt layer, and the hot melt layer is connected to the other of the rigid part and the flexible part, and at least one of the rigid part and the flexible part has a connection structure, and the connection structure is connected to the hot melt layer, and the connection structure includes at least one of a roughened layer, a frosted layer, and a reinforcing layer.

[0073] In the battery device provided by the embodiment of the present application, at least one heat exchanger of the heat exchange assembly is set as a flexible member, and the weight of the flexible member is relatively light, which is conducive to reducing the weight of the heat exchange assembly, thereby improving the energy density of the battery device. On the other hand, the flexible member has a certain flexibility, which can make the heat exchange assembly fit better with the box and / or the battery cell, thereby absorbing the assembly tolerance of the heat exchange assembly, without the need to use a caulking agent or a heat conductive material, improving the fit between the heat exchange assembly and the box and / or the battery cell, and increasing the effective heat exchange area between the heat exchange assembly and the box and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by setting at least one heat exchanger as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, and the rigid member can support the flexible member, which is conducive to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly; in addition, by setting a rigid member, the heat exchange assembly has sufficient structural strength for carrying the battery cell, thereby improving the applicability of the heat exchange assembly. On the other hand, the flexible part and the rigid part are connected by a hot melt layer, and the temperature during connection (150℃±10℃) is lower than the brazing temperature in the related art, and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component. In addition, at least one of the flexible part and the rigid part has a connecting structure, which can improve the strength of the connection with the hot melt layer, thereby improving the connection strength between the flexible part and the rigid part, reducing the risk of leakage of the heat exchange medium, and improving the reliability of use.

[0074] The technical solution described in the embodiments of the present application is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present application, and the battery device is used to provide electric energy.

[0075] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; 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, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0076] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0077] Reference Figure 1 , a controller 200, a motor 300 and a battery device 100 may be arranged inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be arranged at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also 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.

[0078] Reference Figure 2In order to meet different power requirements, the battery device 100 includes a plurality of battery cells 10, which refer to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a plurality of battery cells 10 that are both connected in series and in parallel. A plurality of battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the plurality of battery cells 10 is accommodated in the box 20; of course, the battery device 100 can also be a plurality of battery cells 10 that are first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and are accommodated in the box 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a confluence component for realizing electrical connection between the plurality of battery cells 10. Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0079] Reference Figure 2-Figure 7 The embodiment of the present application provides a battery device 100, which includes a housing 20, a plurality of battery cells 10 and a heat exchange assembly 30. The plurality of battery cells 10 are arranged in the housing 20, and the heat exchange assembly 30 includes at least two heat exchange members, at least one heat exchange member is configured as a flexible member 31, and at least one heat exchange member is configured as a rigid member 32. The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a, and the at least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10, wherein the flexible member 31 includes a metal layer 311, and the heat exchange assembly 30 also includes an insulating structure, and the insulating structure covers the outer peripheral surface of the metal layer 311.

[0080] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0081] Please refer to Figure 2 The battery device 100 includes a housing 20 and a plurality of battery cells 10 , wherein the plurality of battery cells 10 are disposed in the housing 20 .

[0082] The box 20 can be 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. The material of the box 20 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0083] The box body 20 is used to encapsulate the battery cell 10 , and the box body 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10 .

[0084] As an example, the box 20 is generally a rectangular parallelepiped structure, the length direction and width direction of the box 20 are parallel to the horizontal plane, and the length direction of the box 20 is parallel to the longest side of the rectangular parallelepiped structure of the box 20. The height direction of the box 20 is perpendicular to the ground. As an example, Figure 2 As shown, the length direction of the box body 20 is represented by X, the width direction of the box body 20 is represented by Y, and the height direction of the box body 20 is represented by Z.

[0085] Reference Figure 3 and Figure 4 The heat exchange assembly 30 includes at least two heat exchange components, at least one heat exchange component is configured as a flexible component 31, and at least one heat exchange component is configured as a rigid component 32. The flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 30a. The at least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with multiple battery cells 10.

[0086] Here, the flexibility in the flexible member 31 refers to the material property of the structure, and this type of property can be a property given to the material due to the light weight of the material, or a property given to the material due to at least any one of the material's thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible member 31 can be selected to be a material with a lighter weight than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible member 31.

[0087] In the embodiment of the present application, the heat exchange assembly 30 is configured to include a flexible member 31 , which helps to reduce the weight of the heat exchange assembly 30 and thereby improve the energy density of the battery device 100 .

[0088] Furthermore, the flexible part 31 has certain expandable or contractible properties, and it can also be understood that the flexible part 31 can be an elastically deformable structure, and the flexible part 31 has the ability to deform and restore deformation, so that the heat exchange component 30 can adapt to the external contour shape of the battery cell 10 or other components through a certain elastic deformation, so as to improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 10, thereby improving the heat exchange efficiency.

[0089] Here, the rigidity in the rigid part 32 refers to the material property of the structure. This type of property can be a property given to the material due to its heavy mass, or a property given to the material due to at least any one of its thickness, rigidity, strength, elastic modulus, etc. As an example, the material of the rigid part 32 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a material of a structure such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 32. The embodiment of the present application can support the flexible part 31 by configuring the heat exchange component 30 to include a rigid part 32, which is beneficial to improving the overall structural strength and stability of the heat exchange component 30.

[0090] By configuring the heat exchange component 30 to include the flexible component 31 and the rigid component 32 , the heat exchange component 30 can have a certain structural strength while having a flexible function.

[0091] The flexibility of the heat exchange assembly 30 can make the heat exchange surface of the heat exchange assembly 30 fit better with the battery cell 10 , further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30 .

[0092] The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a, which means that the heat exchange assembly 30 forms the medium flow channel 30a between the flexible member 31 and the rigid member 32. In other words, the flexible member 31 constitutes at least part of the side wall of the medium flow channel 30a, and the rigid member 32 also constitutes at least part of the side wall of the medium flow channel 30a. The heat exchange medium flows in the medium flow channel 30a to achieve heat exchange with the battery cell 10.

[0093] As an example, the surface of the flexible member 31 facing the rigid member 32 is concave to form a flow channel groove, and the surface of the rigid member 32 facing the flexible member 31 is a plane, and the plane and the flow channel groove are arranged to form a medium flow channel 30a. Alternatively, the surface of the rigid member 32 facing the flexible member 31 is concave to form a flow channel groove, and the surface of the flexible member 31 facing the rigid member 32 is a plane, and the plane and the flow channel groove are arranged to form a medium flow channel 30a. Alternatively, the surfaces of the flexible member 31 and the rigid member 32 facing each other are both concave to form a flow channel groove, and the flow channel groove of the flexible member 31 and the flow channel groove of the rigid member 32 are arranged to form a medium flow channel 30a.

[0094] The medium channel 30a is used to conduct heat exchange medium. It should be noted that the specific type of heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 10, for example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a coolant.

[0095] The specific number of the medium flow channels 30a is not limited here, and can be one or more.

[0096] At least one heat exchange component is configured as a flexible component 31, which means that the number of the flexible components 31 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 31, the flexible components 31 may be the same or different.

[0097] At least one heat exchange component is configured as a rigid component 32, which means that the number of rigid components 32 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 32, the rigid components 32 may be the same or different.

[0098] As an example, the heat exchange component 30 includes two heat exchange parts, one of which is a flexible part 31 and the other is a rigid part 32. As an example, the heat exchange component 30 includes three or more heat exchange parts, at least two of which are flexible parts 31, or at least two of which are rigid parts 32, and the flexible parts 31 and the rigid parts 32 are arranged alternately.

[0099] As an example, the rigid member 32 is a rigid plate-like structure, which can support the flexible member 31 , thereby facilitating improving the overall structural strength and stability of the heat exchange assembly 30 .

[0100] As an example, the heat exchange member has an inlet 30b and an outlet 30c, and the inlet 30b and the outlet 30c are both connected to the medium flow channel 30a. Here, the inlet 30b and the outlet 30c are used for the heat exchange medium to enter and flow out of the medium flow channel 30a. The inlet 30b and / or the outlet 30c may be formed by a rigid member 32, or by a flexible member 31.

[0101] As an example, see Figure 3 and Figure 4 The heat exchange assembly 30 further includes a connector 33 communicating with the inlet 30b and a connector 33 communicating with the outlet 30c. As an example, the connector 33 includes a water nozzle. As an example, the inlet 30b and the outlet 30c are both formed on the rigid member 32, and the connector 33 is brazed to the rigid member 32.

[0102] The principle of heat exchange of the heat exchange component 30 for the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell 10, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, completing the heat exchange of the battery cell 10.

[0103] Here, the heat exchange component 30 exchanging heat with the battery cell 10 may be to dissipate heat from the battery cell 10 or to heat the battery cell 10 .

[0104] The principle of heat dissipation of the battery cell 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30, and after the heat exchange medium absorbs the heat generated by the battery cell 10 during operation, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 10.

[0105] The principle of the heat exchange component 30 heating the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell 10. After heating the battery cell 10, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, completing the heating of the battery cell 10.

[0106] The specific location of the heat exchange assembly 30 is not limited here.

[0107] In some embodiments, at least one heat exchange assembly 30 is disposed on the top side of the battery cell 10. As an example, refer to Figure 2 The box body 20 includes a box body 21 and a top cover 22 connected to the top side of the box body 21. In this case, at least one heat exchange assembly 30 is disposed between the top cover 22 and the battery cell 10, and / or at least one heat exchange assembly 30 is disposed on a side of the top cover 22 away from the battery cell 10. As another example, the top side of the box body 20 has an opening, and the heat exchange assembly 30 covers the opening.

[0108] In some embodiments, at least one heat exchange assembly 30 is disposed on the bottom side of the battery cell 10. As an example, refer to Figure 2 The box body 20 includes a bottom guard plate 23 connected to the bottom side of the box body 21. In this case, at least one heat exchange assembly 30 is disposed between the bottom guard plate 23 and the battery cell 10, and / or at least one heat exchange assembly 30 is disposed on a side of the bottom guard plate 23 away from the battery cell 10. As another example, the bottom side of the box body 20 has an opening, and the heat exchange assembly 30 covers the opening.

[0109] In some embodiments, at least one heat exchange assembly 30 is disposed on one side of the battery cell 10 along the length direction or the width direction of the box body 20. Figure 2 The box body 21 includes a side beam 211, which is used to constrain the battery cell 10. The heat exchange assembly 30 is arranged between the side beam 211 and the battery cell 10, or the heat exchange assembly 30 is arranged on the side of the side beam 211 away from the battery cell 10.

[0110] In some embodiments, at least one heat exchange assembly 30 is disposed between two adjacent battery cells 10. As an example, at least one heat exchange assembly 30 is disposed between the large surfaces of two adjacent battery cells 10, where the large surface refers to the surface with the largest area among the surfaces of the battery cells 10.

[0111] In the embodiment where the heat exchange assembly 30 is disposed between the box body 20 and the battery cell 10, the relative positional relationship between the rigid part 32 and the flexible part 31 of the heat exchange assembly 30 and the battery cell 10 is not limited, for example, the rigid part 32 may be oriented toward the battery cell 10, and the flexible part 31 may be oriented toward the box body 20, thus providing a stronger support force for the battery cell 10. Alternatively, the flexible part 31 may be oriented toward one side of the battery cell 10, and the rigid part 32 may be oriented toward the box body 20, thus improving the tightness of the heat exchange assembly 30 and the battery cell 10.

[0112] Reference Figure 5 At least one of the flexible member 31 and the rigid member 32 includes a hot melt layer 34 , and the hot melt layer 34 is connected to the other of the rigid member 32 and the flexible member 31 .

[0113] Here, the hot melt layer 34 specifically refers to a layered structure formed by a hot melt material, and the hot melt material here includes but is not limited to one or more of polypropylene (PP), polyethylene (PE), polyester (PES), polyamide (PA), and ethylene-vinyl acetate copolymer (EVA).

[0114] The flexible member 31 may include the hot-melt layer 34 , the rigid member 32 may include the hot-melt layer 34 , or both the flexible member 31 and the rigid member 32 may include the hot-melt layer 34 , and there is no limitation to this.

[0115] As an example, the flexible member 31 and the rigid member 32 are hot pressed to form a hot pressing area 30d and a medium flow channel 30a, and the hot melt layer 34 is disposed in at least a portion of the hot pressing area 30d.

[0116] As an example, the heat-pressing area 30d includes a heat-sealing area and a non-heat-sealing area, the hot melt layer 34 is arranged in the heat-sealing area, and the non-heat-sealing area and the medium flow channel 30a are respectively located on both sides of the heat-sealing area, which is conducive to reducing the width of the heat-sealing area, improving the problem of excessive temperature caused by the heat-sealing area being too wide, affecting the heat-pressing quality and damaging the flexible member 31. In addition, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 31 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causes damage to the heat-sealing area.

[0117] In the related art, the heat exchange assembly 30 is formed by welding two pieces of high-strength aluminum alloy. However, since high-strength aluminum alloy (5 series, 6 series, etc.) has a high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0118] In this embodiment, the connection between the flexible part 31 and the rigid part 32 is achieved through the hot melt layer 34. It can be understood that the melting temperature of the hot melt layer 34 is usually lower than the brazing temperature in the related art (usually 150℃±10℃), and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 30.

[0119] Furthermore, the present application proposes that, although the use of a hot melt layer 34 to connect the rigid part 32 and the flexible part 31 has the above-mentioned advantages, in some usage scenarios, the hot melt layer 34 may have a problem of insufficient connection strength. Insufficient connection strength will cause gaps to form at some positions between the rigid part 32 and the flexible part 31, thereby creating a risk of heat exchange medium leakage.

[0120] For this purpose, refer to Figure 5 In this embodiment, at least one of the rigid component 32 and the flexible component 31 has a connecting structure 35 , and the connecting structure 35 is connected to the hot-melt layer 34 .

[0121] Here, the connection structure 35 may generally refer to a structure having a high connection strength when connected to the hot melt layer 34. By adding the connection structure 35, the connection strength between the rigid part 32 and the flexible part 31 can be improved, thereby reducing the risk of heat exchange medium leakage and improving the reliability of use.

[0122] As an example, the connecting structure 35 can be a structure formed by surface treatment at the position of the flexible part 31 / rigid part 32 for connecting with the hot melt layer 34. The surface treatment here includes but is not limited to roughening treatment, frosting treatment, etc. The structure formed by such surface treatment can increase the contact area with the hot melt layer 34, thereby achieving a higher connection strength when connected with the hot melt layer 34.

[0123] As another example, the connecting structure 35 can be a layer structure or other structure formed by a material having a high connection strength with the hot melt layer 34 and the corresponding structures of the flexible part 31 / rigid part 32. In this case, the connecting structure 35 actually plays the role of a transition connection, which can improve the connection strength compared with the corresponding structure of the flexible part 31 / rigid part 32 being directly connected to the hot melt layer 34.

[0124] In some embodiments, specifically, the connection structure 35 includes at least one of a roughened layer, a frosted layer, and a reinforcement layer. Here, the roughened layer specifically refers to a structure formed by roughening the surface. The frosted layer specifically refers to a structure formed by frosting the surface. The reinforcement layer specifically refers to a layered structure composed of a certain substance or several substances. The specific material of the reinforcement layer can be specifically determined according to the material properties of the two materials it actually connects. Examples of specific material selection will also be given in the relevant parts below, which will not be repeated here.

[0125] In this embodiment, only the rigid part 32 may have the connection structure 35, only the flexible part 31 may have the connection structure 35, or both the rigid part 32 and the flexible part 31 may have the connection structure 35. In the case where both the rigid part 32 and the flexible part 31 have the connection structure 35, the connection structures 35 of the rigid part 32 and the flexible part 31 may be the same (e.g., both may be a roughened layer, or both may be a frosted layer, or both may be a reinforcing layer), or different (e.g., the connection structure 35 of the rigid part 32 may be a roughened layer or a frosted layer, and the connection structure of the flexible part 31 may be a reinforcing layer). The rigid part 32 and / or the flexible part 31 may have only one connection structure 35, or may have multiple connection structures 35 at the same time.

[0126] In the battery device 100 provided in the embodiment of the present application, at least one heat exchange component of the heat exchange assembly 30 is configured as a flexible component 31. The flexible component 31 is light in weight, which helps to reduce the weight of the heat exchange assembly 30 and thereby improve the energy density of the battery device 100.

[0127] On the other hand, the flexible part 31 has a certain flexibility, which can make the heat exchange component 30 fit better with the case 20 and / or the battery cell 10, thereby absorbing the assembly tolerance of the heat exchange component 30 without the use of filler or thermal conductive material, thereby improving the fit between the heat exchange component 30 and the case 20 and / or the battery cell 10, and increasing the effective heat exchange area between the heat exchange component 30 and the case 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0128] On the other hand, by setting at least one heat exchange component as a rigid component 32, the flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 30a. The rigid component 32 can support the flexible component 31, which is beneficial to improve the overall structural strength and stability of the heat exchange component 30, and further improve the heat exchange efficiency and heat exchange effect of the heat exchange component 30. In addition, by setting the rigid component 32, the heat exchange component 30 has sufficient structural strength to carry the battery cell 10, thereby improving the applicability of the heat exchange component 30.

[0129] On the other hand, the flexible part 31 and the rigid part 32 are connected by the hot melt layer 34. The temperature during connection (150℃±10℃) is lower than the brazing temperature in the related art, and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 30. In addition, at least one of the flexible part 31 and the rigid part 32 has a connecting structure 35, which can improve the strength of the connection with the hot melt layer 34, thereby improving the connection strength between the flexible part 31 and the rigid part 32, reducing the risk of leakage of the heat exchange medium, and improving the reliability of use.

[0130] In some embodiments, reference Figure 6 and Figure 7The connection structure 35 includes a textured layer 321 , and at least the rigid component 32 is provided with the textured layer 321 .

[0131] Here, the roughened layer 321 specifically refers to a structure formed by roughening the surface, and here, the roughening process specifically refers to a process of forming a large number of pits or textures on the surface. As an example, the roughened layer 321 is a laser roughened layer 321, that is, the roughened layer 321 is formed by roughening by laser etching.

[0132] At least the rigid part 32 is provided with the textured layer 321 , which means that the rigid part 32 is provided with the textured layer 321 , and the flexible part 31 may be provided with the textured layer 321 or may not be provided with the textured layer 321 .

[0133] In this embodiment, by configuring the connection structure 35 as a roughened layer 321 , it helps to further enhance the connection strength of the connection structure 35 , thereby helping to further enhance the reliability of the heat exchange assembly 30 .

[0134] In some embodiments, reference Figure 7 The textured layer 321 forms a connecting groove 322 , and the hot melt layer 34 at least partially fills the connecting groove 322 .

[0135] Here, the connecting groove 322 specifically refers to a groove-like structure formed in the roughened layer 321. The connecting groove 322 is open on at least one side facing the hot melt layer 34. Therefore, when connecting, the hot melt material in the hot melt layer 34 will be able to enter the connecting groove 322 through the opening after melting, so that after the connection is completed, the hot melt layer 34 at least partially fills the connecting groove 322.

[0136] The size and number of the connection grooves 322 are not limited. As an example, the size of the connection grooves 322 is in the micron level, which helps to reduce the impact of the setting of the connection grooves 322 on the structural strength of the rigid part 32 / flexible part 31.

[0137] Taking the rigid part 32 / flexible part 31 as a rectangular plate as an example, the connecting groove 322 can extend along one or more of the length direction, the width direction, and the diagonal direction. The connecting groove 322 can pass through the roughened layer 321 in its extension direction, or may not pass through the roughened layer 321.

[0138] In this embodiment, by forming a connection groove 322 in the roughened layer 321 , it helps to significantly increase the contact area between the hot melt layer 34 and the rigid component 32 , thereby increasing the connection strength between the hot melt layer 34 and the roughened layer 321 , thereby increasing the reliability of the heat exchange component 30 .

[0139] It should be noted that, in some other embodiments, the textured layer 321 may not form the connection groove 322, but may form a hole structure, a protrusion structure, etc.

[0140] In some embodiments, reference Figure 7 The connecting groove 322 has an opening portion 322a and an expansion portion 322b connected to the opening portion 322a. The opening portion 322a is arranged toward the hot melt layer 34. In the projection plane perpendicular to the stacking direction of the flexible part 31 and the rigid part 32, the projection area of ​​the opening portion 322a is smaller than the projection area of ​​the expansion portion 322b.

[0141] Here, the opening portion 322 a is specifically used to allow the hot-melt material in the hot-melt layer 34 to flow into the expansion portion 322 b.

[0142] Here, along the direction away from the opening 322a, the projection area of ​​the connection portion may gradually increase, may first increase and then decrease, or may first decrease and then increase. As an example, the cross section of the connection groove 322 perpendicular to the extension direction and the above-mentioned stacking direction may be trapezoidal, spherical, etc., without limitation.

[0143] In this embodiment, by setting the connecting groove 322 into the above-mentioned shape, on the one hand, it helps to further increase the contact area between the rigid part 32 and the hot melt layer 34, and on the other hand, it helps to improve the restraint ability of the connecting groove 322 on the hot melt layer 34 filled therein. In summary, it helps to further improve the connection strength.

[0144] It should be noted that, in some other embodiments, in the projection plane perpendicular to the stacking direction, the projection areas of the connection grooves 322 at various positions may also be the same.

[0145] In some embodiments, reference Figure 6 The number of the connecting grooves 322 is multiple, and the multiple connecting grooves 322 are arranged in parallel or staggered.

[0146] In the embodiment where multiple connection grooves 322 are arranged in parallel, the extension direction of the connection grooves 322 can be any direction. For example, when the flexible member 31 / rigid member 32 is a rectangular plate, the extension direction of the connection grooves 322 can be parallel to the length direction, the width direction, or the diagonal direction. In this embodiment, the connection grooves 322 can be equally spaced or unequally spaced.

[0147] Specifically, the staggered arrangement of the plurality of connection grooves 322 means that the extension directions of at least two connection grooves 322 intersect among the plurality of connection grooves 322. Still taking the flexible member 31 / rigid member 32 as a rectangular plate as an example, a portion of the connection grooves 322 may extend in the length direction, and another portion of the connection grooves 322 may extend in the width direction, that is, the plurality of connection grooves 322 are distributed in a chessboard shape.

[0148] In this embodiment, the parallel arrangement of the plurality of connection grooves 322 helps to improve the connection strength while minimizing the impact on the structural strength of the rigid member 32 / flexible member 31. The staggered arrangement of the plurality of connection grooves 322 helps to obtain a larger contact area and further improve the connection strength.

[0149] In some embodiments, the connection structure 35 includes a frosted layer, and at least the rigid member 32 is provided with the frosted layer.

[0150] Here, the frosted layer specifically refers to a structure formed by frosting.

[0151] The main difference between the frosted layer and the roughened layer 321 is that the roughened layer is usually achieved by laser etching, which has a higher etching precision, so that the microstructures (such as the connection grooves 322 mentioned above) formed in the roughened layer 321 are relatively regularly distributed and have a relatively uniform shape. The frosted layer is usually achieved by sandblasting, chemical etching, etc., so that the microstructures formed in the frosted layer are relatively irregularly distributed (but usually denser than the microstructures in the roughened layer 321) and have relatively diverse shapes.

[0152] At least the rigid component 32 is provided with a frosted layer specifically means that the rigid component 32 is provided with a frosted layer, and the flexible component 31 may be provided with a frosted layer or may not be provided with a frosted layer.

[0153] It should be noted that, in the area of ​​the rigid member 32 connected to the hot-melt layer 34 , a part thereof may be provided with a frosted layer, and another part thereof may be provided with a textured layer 321 .

[0154] In this embodiment, the connection structure 35 includes a frosted layer, which helps to increase the contact area with the hot melt layer 34, thereby helping to improve the connection strength. In addition, compared with the roughened layer 321, the frosted layer helps to reduce manufacturing difficulty and cost and improve production efficiency.

[0155] In some embodiments, the frosted layer is configured as a chemical etching layer, or the frosted layer is configured as a sandblasting layer.

[0156] The chemical etching layer specifically refers to a frosted layer formed by chemical etching, and the sandblasting layer specifically refers to a frosted layer formed by sandblasting.

[0157] In this embodiment, by setting the frosted layer as a chemical etching layer or a sandblasting layer, it helps to further reduce the manufacturing difficulty and cost.

[0158] In some embodiments, the rigid member 32 is a metal plate.

[0159] As an example, the rigid member 32 may be an aluminum alloy plate, and the outer surface of the plate may be insulated.

[0160] In this embodiment, by setting the rigid member 32 as a metal plate, the metal plate can still have good structural strength while forming the above-mentioned frosted layer and / or roughened layer 321, and has good thermal conductivity.

[0161] In some embodiments, reference Figure 5 The connection structure 35 includes a reinforcing layer 312 , the flexible member 31 includes a metal layer 311 and a reinforcing layer 312 which are stacked, and the reinforcing layer 312 connects the metal layer 311 and the hot melt layer 34 .

[0162] It can be understood that, here, the stacking direction of the metal layer 311 and the reinforcement layer 312 is the same as the stacking direction of the flexible member 31 and the rigid member 32 .

[0163] Hot-melt materials are usually non-polar materials with relatively low surface energy. Their strength when combined with high surface energy materials of metals is relatively low. For this reason, in the present application, the metal layer 311 and the hot-melt layer 34 are connected by a reinforcing layer 312 .

[0164] Here, the reinforcing layer 312 specifically refers to a layered structure formed by one or several substances, which have a high connection strength when connected to the metal layer 311 and when connected to the hot melt layer 34, at least, higher than the connection strength when the metal layer 311 and the hot melt layer 34 are directly connected.

[0165] The specific material of the reinforcing layer 312 can be determined by those skilled in the art based on the specific materials of the hot melt layer 34 and the metal layer 311 , and is not limited thereto.

[0166] In this embodiment, a reinforcing layer 312 is provided in the flexible member 31, which, on the one hand, helps to improve the connection strength between the flexible member 31 and the hot melt layer 34, and further improves the connection strength between the flexible member 31 and the rigid member 32. On the other hand, it also helps to improve the structural strength of the flexible member 31 itself, and further improves the durability of the heat exchange assembly 30.

[0167] It should be noted that, in addition to the above-mentioned metal layer 311, the flexible member 31 may also include other layer structures, such as Figure 5 In some embodiments, the flexible member 31 further includes an insulating layer 313 stacked on the side of the metal layer 311 away from the reinforcement layer 312. The specific connection method between the layers of the flexible member 31 is not limited, such as bonding, welding, etc.

[0168] In some embodiments, the reinforcement layer 312 is a non-metal material layer.

[0169] It is understood that non-metallic materials generally have a lower weight than metallic materials. In this embodiment, the reinforcement layer 312 is set as a non-metallic material layer, which helps to reduce the weight of the flexible member 31 as much as possible while improving the connection strength and the structural strength of the flexible member 31 itself, thereby helping to improve the energy density of the battery device 100.

[0170] In some embodiments, the reinforcement layer 312 includes one or more of polar group-modified polypropylene, glass fiber, and carbon fiber.

[0171] Here, polar group modified polypropylene refers to a substance obtained by introducing polar groups into polypropylene through common modification methods in the art, such as surface treatment (such as plasma treatment, acid etching, coating, etc.), filler (such as adding glass fiber, carbon fiber, nanofiller), graft modification, etc. Any polar group modified polypropylene provided in the relevant art can be applied here.

[0172] Here, the reinforcement layer 312 may specifically be glass fiber prepreg, carbon fiber prepreg, or the like.

[0173] In this embodiment, the reinforcing layer 312 made of the above-mentioned material helps to further improve the connection strength and the structural strength of the flexible member 31 , and reduce the weight of the flexible member 31 .

[0174] In some embodiments, the metal layer 311 includes one of aluminum foil, copper foil and steel foil.

[0175] In this embodiment, the metal layer 311 made of such a material can make the flexible member 31 have a certain structural strength and can play an isolation role.

[0176] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0177] The flexible member 31 is a single-layer or multi-layer film.

[0178] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel 30a is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced.

[0179] In some embodiments, the flexible member 31 comprises an aluminum-plastic film.

[0180] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0181] In some embodiments, the thickness of the flexible member 31 is 0.05 mm-0.3 mm.

[0182] As an example, the thickness of the flexible member 31 is any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm or any value therebetween.

[0183] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength while making the overall thickness of the heat exchange component 30 smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0184] In some embodiments, the thickness of the flexible member 31 is 0.08 mm-0.2 mm.

[0185] As an example, the thickness of the flexible member 31 is any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, and 0.2 mm, or any value therebetween.

[0186] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0187] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0188] As an example, the elastic modulus of the flexible member 31 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0189] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to force within a certain range. It is one of the basic physical quantities of a material. The larger the elastic modulus, the greater the stiffness of the material and the greater its compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0190] The elastic modulus of the flexible member 31 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0191] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by a nanoindentation method, which uses a tiny indenter to indent the surface of the flexible member 31 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0192] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0193] In some embodiments, the elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32. The elongation at break is a percentage of the elongation of the material when it is stretched to break to the original length. It is used to measure the deformation capacity that the material can withstand during the stretching process, that is, the elongation at break indicates the ductility of the material when it is stretched under force.

[0194] The elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32 . In other words, when stretched, the ductility of the flexible member 31 is greater than the ductility of the rigid member 32 .

[0195] In some embodiments, the elongation at break of the flexible member 31 is in a range of 30% to 300%.

[0196] The elongation at break of the flexible member 31 may be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any value therebetween.

[0197] In this embodiment, by setting the elongation at break of the flexible member 31 to be in the range of 30% to 300%, the flexible member 31 can have certain impact resistance and puncture resistance as well as certain structural strength.

[0198] In some embodiments, the elongation at break of the rigid member 32 is in a range of 1% to 50%.

[0199] The elongation at break of the rigid member 32 may be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or any value therebetween.

[0200] In this embodiment, by setting the elongation at break of the rigid component 32 to be in the range of 1% to 50%, the rigid component 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0201] In some embodiments, the medium flow channel 30 a includes a plurality of sub-flow channels, each battery cell 10 corresponds to a plurality of sub-flow channels, and an extension direction of the sub-flow channels corresponding to the battery cell 10 is perpendicular to a length direction of the battery cell 10 .

[0202] The plurality of sub-flow channels are connected to form a medium flow channel 30 a .

[0203] The extension direction of the sub-channels is perpendicular to the length direction of the battery cell 10 , that is, the multiple sub-channels are arranged along the length direction of the battery cell 10 , so that the length direction of the battery cell 10 corresponds to the multiple sub-channels.

[0204] It can be understood that the temperature of the heat exchange medium will gradually increase along the flow direction of the heat exchange medium. Therefore, by corresponding each battery cell 10 to multiple sub-flow channels, it is helpful to improve the uniformity of the temperature of the battery cell 10.

[0205] Reference Figure 2-Figure 7 The battery device 100 includes a housing 20, a heat exchange assembly 30 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the housing 20. The heat exchange assembly 30 includes at least two heat exchange members, at least one heat exchange member is configured as a flexible member 31, and at least one heat exchange member is configured as a rigid member 32. The elastic modulus of at least a portion of the flexible member 31 is smaller than the elastic modulus of the rigid member 32. The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10.

[0206] At least one of the flexible member 31 and the rigid member 32 includes a hot melt layer 34, and the hot melt layer 34 is connected to the other of the flexible member 31 and the rigid member 32. Specifically, the flexible member 31 and the rigid member 32 form a hot pressing area 30d and a medium flow channel 30a, and the hot melt layer 34 is disposed in at least a portion of the hot pressing area 30d.

[0207] The flexible member 31 and the rigid member 32 both have a connection structure 35 , and the connection structure 35 is connected to the hot-melt layer 34 . The connection structure 35 includes a textured layer 321 disposed on the rigid member 32 and a reinforcement layer 312 disposed on the flexible member 31 .

[0208] The hairy layer 321 forms a plurality of connection grooves 322, which are arranged in parallel or staggered, and the hot melt layer 34 at least partially fills the connection grooves 322. The connection groove 322 has an opening 322a and an expansion portion 322b connected to the opening 322a, and the opening 322a is arranged toward the hot melt layer 34. In the projection plane perpendicular to the stacking direction of the flexible member 31 and the rigid member 32, the projection area of ​​the opening 322a is smaller than the projection area of ​​the expansion portion 322b.

[0209] The flexible member 31 specifically includes a metal layer 311 and a reinforcement layer 312 which are stacked. The reinforcement layer 312 connects the metal layer 311 and the hot-melt layer 34 , and the reinforcement layer 312 is a non-metal material layer.

[0210] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0211] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: The battery device comprises: Box; A plurality of battery cells, wherein the plurality of battery cells are arranged in the box; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange members, at least one of which is configured as a flexible member, and at least one of which is configured as a rigid member, wherein the flexible member and the rigid member are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; Among them, at least one of the flexible part and the rigid part includes a hot melt layer, the hot melt layer is connected to the other of the rigid part and the flexible part, at least one of the rigid part and the flexible part has a connecting structure, the connecting structure is connected to the hot melt layer, and the connecting structure includes at least one of a roughened layer, a frosted layer, and a reinforcing layer.

2. The battery device according to claim 1, characterized in that: The connection structure comprises a textured layer, and at least the rigid component is provided with the textured layer.

3. The battery device according to claim 2, characterized in that: The textured layer forms a connecting groove, and the hot-melt layer at least partially fills the connecting groove.

4. The battery device according to claim 3, characterized in that: The connecting groove has an opening portion and an expansion portion connected to the opening portion, the opening portion is arranged toward the hot melt layer, and in a projection plane perpendicular to the stacking direction of the flexible component and the rigid component, a projection area of ​​the opening portion is smaller than a projection area of ​​the expansion portion.

5. The battery device according to claim 3, characterized in that: There are multiple connecting grooves, and the multiple connecting grooves are arranged in parallel or staggered.

6. The battery device according to claim 1, characterized in that: The connection structure comprises a frosted layer, and at least the rigid part is provided with the frosted layer.

7. The battery device according to claim 6, characterized in that: The frosted layer is configured as a chemical etching layer, or the frosted layer is configured as a sandblasting layer.

8. The battery device according to any one of claims 1 to 7, characterized in that: The rigid member is a metal plate.

9. The battery device according to any one of claims 1 to 7, characterized in that: The connection structure includes a reinforcement layer, the flexible member includes a metal layer and the reinforcement layer which are stacked, and the reinforcement layer connects the metal layer and the hot-melt layer.

10. The battery device according to claim 9, characterized in that: The reinforcement layer is a non-metal material layer.

11. The battery device according to claim 10, characterized in that: The reinforcement layer comprises one of polar group modified polypropylene, glass fiber and carbon fiber.

12. The battery device according to claim 9, characterized in that: The metal layer includes one of aluminum foil, copper foil and steel foil.

13. The battery device according to any one of claims 1 to 7 and 10 to 12, characterized in that: The flexible member includes a metal plasticized film.

14. The battery device according to claim 13, characterized in that: The flexible member comprises an aluminum-plastic film.

15. The battery device according to any one of claims 1 to 7 and 10 to 12, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

16. The battery device according to any one of claims 1 to 7 and 10 to 12, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

17. A heat exchange component, characterized in that: The heat exchange assembly comprises at least two heat exchange members, at least one of which is a flexible member, and at least one of which is a rigid member, wherein the flexible member and the rigid member are stacked to form at least one medium flow channel, wherein the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a battery cell; Wherein, the heat exchange component includes a hot melt layer, the hot melt layer connects the rigid part and the flexible part, at least one of the rigid part and the flexible part has a connecting structure, the connecting structure is connected to the hot melt layer, and the connecting structure includes at least one of a roughened layer, a frosted layer, and a reinforcing layer.

18. An electrical equipment, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1 to 16, or the heat exchange component according to claim 17.

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