Composite liquid cooling plate, battery pack and electric equipment

Abstract

The utility model relates to a composite liquid cooling plate, a battery pack and electric equipment. The composite liquid cooling plate comprises an upper cooling plate and a lower cooling plate, the upper cold plate comprises a first composite material layer and a first metal layer which are integrally formed through compression molding. The lower cold plate comprises a second composite material layer and a second metal layer which are integrally formed through compression molding; the first metal layer and the second metal layer are located between the first composite material layer and the second composite material layer, and a liquid cooling flow channel is defined by the first metal layer and the second metal layer. The composite liquid cooling plate has the basic function of thermal management, and can prevent the problem of insulation failure after thermal runaway; meanwhile, compared with the related technology, the second composite material layer is arranged at the bottom making contact with the outside, and electrochemical corrosion can be effectively prevented. In addition, the upper cold plate and the lower cold plate of the composite liquid cooling plate both adopt metal layer and composite material layer assemblies, so that the manufacturing cost can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid cooling plates, and in particular to a composite liquid cooling plate, a battery pack and an electrical device. Background Art

[0002] The liquid cooling plate is a core component of the thermal management system of the battery pack. Currently, the manufacturing of the liquid cooling plate usually requires first stamping the upper liquid cooling plate into a flow channel, and then welding it to the lower liquid cooling plate. In related technologies, when pure metal aluminum cold plates are used in battery packs, in order to prevent thermal runaway insulation failure, it is necessary to spray a high-temperature and electrolyte-resistant coating on the side in contact with the battery cell or attach a PI high-temperature resistant insulating film; at the same time, in order to reduce electrochemical corrosion, it is necessary to spray an anti-corrosion coating on the flow channel side in contact with the bottom guard plate. The manufacturing cost of the liquid cooling plate is high. At the same time, the attachment and curing of the insulating film or anti-corrosion coating require heating, which can easily cause stress and deformation of the liquid cooling plate. Utility Model Content

[0003] The purpose of the present disclosure is to provide a composite liquid cooling plate, a battery pack and an electrical device to at least partially solve the related technical problems.

[0004] In order to achieve the above-mentioned object, the present disclosure provides, in a first aspect, a composite liquid cooling plate, comprising an upper cooling plate and a lower cooling plate;

[0005] The upper cold plate includes a first composite material layer and a first metal layer formed by integral compression molding;

[0006] The lower cold plate includes a second composite material layer and a second metal layer formed in one piece by compression molding;

[0007] The first metal layer and the second metal layer are located between the first composite material layer and the second composite material layer, and the first metal layer and the second metal layer form a liquid cooling channel.

[0008] Optionally, the first composite material layer and the second composite material layer both include a matrix and a filler formed in the matrix; wherein the matrix is ​​epoxy resin, polyurethane resin or unsaturated resin; the filler is glass fiber or carbon fiber; and / or

[0009] The first metal layer and the second metal layer are made of aluminum or aluminum alloy.

[0010] Optionally, the thickness of the first composite material layer and the second composite material layer is 1-10 mm; and / or

[0011] The thickness of the first metal layer and the second metal layer is 10-800 μm; and / or

[0012] The thermal conductivity of the first composite material layer is ≥ 0.6 W / mK; and / or

[0013] The thermal conductivity of the second composite material layer is ≤0.8 W / mK.

[0014] Optionally, the thickness of the first composite material layer is 1-3 mm, and the thickness of the second composite material layer is 5-8 mm; and / or

[0015] The thickness of the first metal layer and the second metal layer is 50-100 μm; and / or

[0016] The thermal conductivity of the first composite material layer is ≥1.2 W / mK; and / or

[0017] The thermal conductivity of the second composite material layer is ≤0.3 W / mK.

[0018] Optionally, the upper cold plate and the lower cold plate are connected by bonding or electromagnetic pulse welding.

[0019] Optionally, the composite liquid cooling plate further includes a liquid inlet pipe and a liquid outlet pipe respectively connected to two ends of the liquid cooling channel.

[0020] Optionally, one of the first metal layer and the second metal layer is formed with a flow channel groove, and the flow channel groove and the other metal layer form the liquid cooling flow channel; and / or

[0021] The first metal layer is formed with a first liquid inlet groove and a first liquid outlet groove, and the second metal layer is formed with a second liquid inlet groove and a second liquid outlet groove;

[0022] The first liquid inlet groove and the second liquid inlet groove form the liquid inlet pipeline; the first liquid outlet groove and the second liquid outlet groove form the liquid outlet pipeline.

[0023] In a second aspect of the present disclosure, a battery pack is provided, including a tray, a battery module, a guard plate, and the composite liquid cooling plate described above;

[0024] The battery module is arranged in the tray, and the composite liquid cooling plate is arranged on the upper surface of the battery module and / or the lower surface of the battery module;

[0025] The guard plate is arranged on the lower surface of the exterior of the tray.

[0026] Optionally, the guard plate and the second composite material layer of the composite liquid cooling plate are integrally formed.

[0027] According to a third aspect of the present disclosure, there is also provided an electrical device, wherein the electrical device comprises the above-mentioned battery pack.

[0028] Through the above technical solution, the composite liquid cooling plate disclosed in the present invention includes an upper cold plate and a lower cold plate, the upper cold plate includes a first composite material layer and a first metal layer that are integrally molded, and the lower cold plate includes a second composite material layer and a second metal layer that are integrally molded, wherein the first metal layer and the second metal layer are located between the first composite material layer and the second composite material layer, and the first metal layer and the second metal layer form a liquid cooling channel. The composite liquid cooling plate has the basic function of thermal management and can prevent insulation failure after thermal runaway; at the same time, compared with the related art, the bottom in contact with the outside world is the second composite material layer, which can effectively prevent electrochemical corrosion. In addition, both the upper cold plate and the lower cold plate of the composite liquid cooling plate use metal layer and composite material layer components, which can also reduce manufacturing costs.

[0029] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0031] Figure 1 is a structural diagram of a composite liquid cooling plate provided in some embodiments of the present disclosure.

[0032] Figure 2 is a disassembly diagram of a composite liquid cooling plate provided in some embodiments of the present disclosure.

[0033] Figure 3 is a top view of a lower cold plate of a composite liquid cold plate provided in some embodiments of the present disclosure.

[0034] Figure 4 is a bottom view of an upper cold plate of a composite liquid cold plate provided in some embodiments of the present disclosure.

[0035] Figure 5 It is a schematic diagram of the lateral structure of the upper cold plate and the lower cold plate of the composite liquid cold plate provided in some embodiments of the present disclosure before being connected.

[0036] Figure 6 It is a schematic diagram of the lateral structure of the upper cold plate and the lower cold plate of the composite liquid cold plate provided in some embodiments of the present disclosure after being connected.

[0037] Description of Reference Numerals

[0038] 100-composite liquid cooling plate; 100a-liquid cooling flow channel; 101-liquid inlet pipe; 101a-liquid inlet groove one; 101b-liquid outlet groove one; 102-liquid outlet pipe; 102a-liquid inlet groove two; 102b-liquid outlet groove two; 110-upper cold plate; 111-first metal layer; 112-first composite material layer; 120-lower cold plate; 1201-flow channel groove; 121-second metal layer; 122-second composite material layer; 130-structural adhesive. DETAILED DESCRIPTION

[0039] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0040] In this disclosure, unless otherwise stated, directional words such as "upper and lower" generally refer to upper and lower in the state of use; "left and right" generally refer to left and right in the corresponding drawings; "inside and outside" refer to the inside and outside of the outline of the component or structure itself. "First, second" and the like are used to distinguish one element from another and do not have order or importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0041] In order to achieve the above purpose, Figures 1 to 6 As shown, an embodiment of the present disclosure provides a composite liquid cooling plate 100, which includes an upper cold plate 110 and a lower cold plate 120; wherein the upper cold plate 110 includes a first composite material layer 112 and a first metal layer 111 that are integrally molded; the lower cold plate 120 includes a second composite material layer 122 and a second metal layer 121 that are integrally molded; the first metal layer 111 and the second metal layer 121 are located between the first composite material layer 112 and the second composite material layer 122, and the first metal layer 111 and the second metal layer 121 form a liquid cooling channel 100a. The liquid cooling channel 100a can be constructed in any suitable manner. Considering that the specific structural shape of the liquid cooling channel 100a is not the main inventive concept of the present disclosure, it will not be described here.

[0042] Through the above technical solution, the composite liquid cooling plate 100 disclosed in the present invention includes an upper cold plate 110 and a lower cold plate 120, the upper cold plate 110 includes a first composite material layer 112 and a first metal layer 111 that are integrally molded, and the lower cold plate 120 includes a second composite material layer 122 and a second metal layer 121 that are integrally molded, wherein the first metal layer 111 and the second metal layer 121 are located between the first composite material layer 112 and the second composite material layer 122, and the first metal layer 111 and the second metal layer 121 form a liquid cooling channel 100a. The composite liquid cooling plate 100 has the basic function of thermal management while preventing the problem of insulation failure after thermal runaway; at the same time, compared with the related art, the bottom in contact with the outside world is the second composite material layer 122, which can effectively prevent electrochemical corrosion. In addition, the upper cold plate 110 and the lower cold plate 120 of the composite liquid cooling plate 100 both use metal layer and composite material layer components, which can also reduce manufacturing costs.

[0043] In the related art, high-temperature insulation is mainly achieved by spraying a high-temperature resistant and electrolyte-resistant coating on the contact side of the cold plate and the battery cell or attaching a PI high-temperature resistant insulating film; at the same time, it is necessary to spray an anti-corrosion coating on the flow channel side where the cold plate contacts the protective plate to reduce electrochemical corrosion. Therefore, the cost is relatively high. At the same time, the cold plate is prone to stress and deformation when the functional layer is cured and baked. The composite liquid cold plate 100 of the embodiment of the present disclosure directly uses a composite material layer to achieve high-temperature insulation and anti-corrosion functions. At the same time, the first metal layer 111 and the second metal layer 121 (such as aluminum foil) can be used instead of the aluminum plate, and the first composite material layer 112 and the second composite material layer 122 can be used as structural support members to reduce costs and effectively prevent electrochemical corrosion.

[0044] It should be noted that the upper cold plate 110 is formed by integrally molding a first composite material layer 112 and a first metal layer 111 (e.g., aluminum foil); the lower cold plate 120 is formed by integrally molding a second composite material layer 122 and a second metal layer 121 (e.g., aluminum foil). The specific process is: the aluminum foil is pre-placed in the mold, and then integrally molded with the composite material layer into a flat upper cold plate 110. The molding process may be one of PCM, SMC, STM, and HP-RTM.

[0045] The first composite material layer 112 and the second composite material layer 122 can be constructed of any suitable material, and the first metal layer 111 and the second metal layer 121 can be made of any suitable material. In some embodiments, the first composite material layer 112 and the second composite material layer 122 both include a matrix and a filler formed in the matrix; wherein the matrix is ​​epoxy resin, polyurethane resin or unsaturated resin; the filler is glass fiber or carbon fiber; and / or the first metal layer 111 and the second metal layer 121 can be made of aluminum or aluminum alloy.

[0046] Among them, the matrix material used to form the first composite material layer 112 and the second composite material layer 122 can be a resin, and the resin type is mainly one of epoxy resin, polyurethane resin or unsaturated resin. Considering that the strength of pure resin materials is not high, the composite material layer disclosed in the present invention adds fillers to the matrix to improve the composite material layer, wherein the filler can be glass fiber or carbon fiber, wherein the glass fiber and carbon fiber can be any one of continuous fiber or short fiber reinforced types or a combination of the two. It should be noted that the composite material layer is configured to keep the structure from collapsing and burning at 500°C.

[0047] It is understandable that the ratio of the matrix and filler in the above-mentioned composite material layer can refer to the components known in the relevant technology, or it can be any ratio directly or indirectly obtained by technical personnel in the field according to the relevant technology, so that the composite material layer can meet the use requirements.

[0048] In some embodiments, the first metal layer 111 and the second metal layer 121 may both be aluminum foil, and the aluminum foil may be pure aluminum or an aluminum alloy, which is not specifically limited here.

[0049] Understandably,

[0050] When the composite liquid cold plate 100 is set on the upper surface of the battery module, the lower cold plate 120 is in contact with the surface of the battery cell; when the composite liquid cold plate 100 is set on the lower surface of the battery module, the upper cold plate 110 is in contact with the surface of the battery cell. Therefore, in order to better achieve heat exchange with the battery cell, the thickness of the cold plate in contact with the battery module of the two cold plates (upper cold plate 110 and lower cold plate 120) is smaller than the thickness of the cold plate away from the battery module.

[0051] When the composite liquid cooling plate 100 is disposed on the lower surface of the battery module, the upper cold plate 110 is bonded to the surface of the battery cell, and the lower cold plate 120 is used to bond to the protective plate. Considering that the upper cold plate 110 is used for heat exchange with the battery module, in some embodiments of the present disclosure, the thickness of the first composite material layer 112 is less than or equal to the thickness of the second composite material layer 122, so that the upper cold plate 110 can better exchange heat with the battery module.

[0052] In some embodiments, in order to meet the requirements of supporting the first metal layer 111 and the second metal layer 121 while taking into account the lightweight requirements of the battery pack, the thickness of the first composite material layer 112 and the second composite material layer 122 is 1~10 mm; the thickness of the first metal layer 111 and the second metal layer 121 is 10~800 μm.

[0053] In order to ensure good heat transfer of the upper cold plate 110 , the thermal conductivity of the first composite material layer 112 is ≥ 0.6 W / mK.

[0054] In addition, in order to ensure good thermal insulation performance of the lower cold plate 120 , the thermal conductivity of the second composite material layer 122 is ≤0.8 W / mK.

[0055] In some preferred embodiments, in order to further consider the lightweight requirements of the battery pack, the thickness of the first composite material layer 112 is 1-3 mm. In order to take into account both the lightweight requirements of the battery pack and the flow resistance requirements of the liquid cooling channel 100a, the thickness of the second composite material layer 122 is 5-8 mm.

[0056] In order to further consider the cost and weight, in some preferred embodiments, the thickness of the first metal layer 111 and the second metal layer 121 is 50-100 μm.

[0057] In some embodiments, the thermal conductivity of the first composite material layer 112 is ≥ 1.2 W / mK, and the thermal conductivity of the second composite material layer 122 is ≤ 0.3 W / mK, thereby further improving the heat exchange capability of the upper cold plate 110 and further ensuring good thermal insulation performance of the lower cold plate 120.

[0058] The upper cold plate 110 and the lower cold plate 120 may be connected in any suitable manner. In some embodiments, the upper cold plate 110 and the lower cold plate 120 may be connected by bonding or electromagnetic pulse welding.

[0059] like Figure 5 and Figure 6 As shown, in some embodiments, the upper cold plate 110 and the lower cold plate 120 can be composited by adhesive film or structural adhesive 130. One side of the first metal layer 111 (aluminum foil) of the upper cold plate 110 is coated with adhesive along the flow channel wall or directly bonded with an adhesive film of fixed thickness, and then molded and hot pressed or cured at room temperature. It should be noted that the structural adhesive 130 or adhesive film used here can be one or a combination of epoxy, polyurethane, acrylate, silane-modified polyether (MS) and mutually modified resins.

[0060] The second metal layer 121 (aluminum foil) and the second composite material layer 122 (resin) are molded and bonded together to form a lower cold plate 120 with a flow channel groove 1201; the first metal layer 111 (aluminum foil) and the first composite material layer 112 (resin) are molded and bonded together to form a flat upper cold plate 110; glue is applied to the bottom of the upper cold plate 110 (aluminum foil) according to the bonding track or a glue film of a fixed thickness is directly bonded; the upper cold plate 110 and the lower cold plate 120 are then molded together for curing and forming, and the upper cold plate 110 and the lower cold plate 120 are bonded to form a closed flow channel, namely, a liquid cooling flow channel 100a.

[0061] It should be noted that the first metal layer 111 can also be formed with a liquid inlet groove 101a and a liquid outlet groove 101b; the second metal layer 121 can be formed with a liquid inlet groove 102a corresponding to the liquid inlet groove 101a, and a liquid outlet groove 102b corresponding to the liquid outlet groove 101b. When the upper cold plate 110 and the lower cold plate 120 are glued together and molded for curing, a liquid inlet pipe 101 and a liquid outlet pipe 102 connected to the liquid cooling channel can be formed.

[0062] In other embodiments, the first metal layer 111 of the upper cold plate 110 and the second metal layer 121 of the lower cold plate 120 may also be connected by electromagnetic pulse welding, thereby forming a liquid cooling channel 100a therebetween. Electromagnetic pulse welding can refer to related known technologies and will not be described in detail here.

[0063] like Figure 1 As shown, in some embodiments, the composite liquid cooling plate 100 further includes a liquid inlet pipe 101 and a liquid outlet pipe 102 respectively connected to both ends of the liquid cooling channel 100a, for implementing the inflow and outflow of the coolant in the composite liquid cooling plate 100. The liquid inlet pipe 101 and the liquid outlet pipe 102 can be constructed as pipe joints to facilitate connection with external pipes.

[0064] In order to form the liquid cooling channel 100a of the composite liquid cooling plate 100, as Figure 3 and Figure 4 As shown, in some embodiments of the present disclosure, one of the first metal layer 111 and the second metal layer 121 is formed with a flow channel groove 1201, and the flow channel groove 1201 and the other form a liquid cooling flow channel 100a. In the embodiments of the present disclosure, when the second metal layer 121 and the second composite material layer 122 are integrally molded, a flow channel groove 1201 recessed toward the second composite material layer 122 can be formed in the second metal layer 121, and a glue film of a fixed thickness is applied or directly bonded between the flow channel wall of the flow channel groove 1201 and the first metal layer 111, and then the mold is closed for hot pressing or cured at room temperature, so as to form a liquid cooling flow channel 100a between the first metal layer 111 and the second metal layer 121.

[0065] In order to form the above-mentioned liquid inlet pipeline 101 and liquid outlet pipeline 102, in some embodiments, the first metal layer 111 is formed with a liquid inlet groove 101a and a liquid outlet groove 101b, and the second metal layer 121 is formed with a liquid inlet groove 102a and a liquid outlet groove 102b; the liquid inlet groove 101a and the liquid inlet groove 102a form the liquid inlet pipeline 101; the liquid outlet groove 101b and the liquid outlet groove 102b form the liquid outlet pipeline 102. Similarly, glue or glue film of fixed thickness is applied or directly bonded between the connecting parts of the liquid inlet groove 101a and the liquid outlet groove 101b corresponding to the liquid inlet groove 2 102a and the liquid outlet groove 2 102b, and then the mold is closed and hot pressed or cured at room temperature, so as to form a liquid inlet pipe 101 and a liquid outlet pipe 102 connected to the liquid cooling channel 100a between the first metal layer 111 and the second metal layer 121, so as to realize the inflow and outflow of cooling liquid.

[0066] The embodiment of the present disclosure provides a battery pack, which may include a tray, a battery module, a protective plate, and the above-mentioned composite liquid cooling plate 100; wherein the battery module is arranged in the tray, the composite liquid cooling plate 100 is arranged on the upper surface of the battery module and / or the lower surface of the battery module; the protective plate is arranged on the lower surface outside the tray. For example, the composite liquid cooling plate 100 can be arranged on the lower surface outside the tray, the upper cold plate 110 of the composite liquid cooling plate 100 is attached to the lower surface of the battery module to achieve heat exchange, and the protective plate is arranged on the lower surface of the composite liquid cooling plate 100 and attached to the lower cold plate 120 to achieve heat preservation.

[0067] In some embodiments, the guard plate is integrally formed with the second composite material layer 122 of the composite liquid cooling plate 100. The guard plate can be made of composite material, and the guard plate and the second composite material of the lower cold plate 120 can be integrated to further save some Z-direction space of the battery pack.

[0068] The embodiments of the present disclosure further provide an electric device, which includes the above-mentioned battery pack. Therefore, the electric device also has all the advantages of the above-mentioned battery pack, which will not be described in detail here.

[0069] It should be noted that the electrical equipment includes but is not limited to vehicles, such as electric vehicles, hybrid vehicles, etc., and can also be other equipment that requires the use of battery packs.

[0070] The composite liquid cooling plate 100, battery pack and electrical equipment of the disclosed embodiment include an upper cold plate 110 and a lower cold plate 120, wherein the upper cold plate 110 includes an integrally molded first composite material layer 112 and a first metal layer 111, and the lower cold plate 120 includes an integrally molded second composite material layer 122 and a second metal layer 121, wherein the first metal layer 111 and the second metal layer 121 are located between the first composite material layer 112 and the second composite material layer 122, and the first metal layer 111 and the second metal layer 121 form a liquid cooling channel 100a. The composite liquid cooling plate 100 has the basic function of thermal management and can prevent the problem of insulation failure after thermal runaway; at the same time, compared with the related art, the bottom in contact with the outside world is the second composite material layer 122, which can effectively prevent electrochemical corrosion. In addition, the upper cold plate 110 and the lower cold plate 120 of the composite liquid cooling plate 100 both use metal layer and composite material layer components, which can also reduce manufacturing costs.

[0071] In summary, compared with the related art, the composite liquid cooling plate 100, battery pack and electrical equipment disclosed in the present invention have the following advantages:

[0072] 1) Eliminate the need for PI insulation on the upper surface of the existing cold plate.

[0073] 2) Reduce the amount of cold plate metal used.

[0074] 3) No need to apply anti-corrosion coating on the lower cold plate flow channel.

[0075] 4) The composite material of the guard plate and the second composite material layer 122 of the lower cold plate 120 can be integrated to save part of the Z-direction space of the battery pack.

[0076] 5) The composite material used for the upper cold plate 110 can reduce insulation failure caused by condensed water and improve the safety of the battery pack.

[0077] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0079] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A composite liquid cooling plate, characterized in that: Including upper cold plate and lower cold plate; The upper cold plate includes a first composite material layer and a first metal layer formed by integral compression molding; The lower cold plate includes a second composite material layer and a second metal layer formed in one piece by compression molding; The first metal layer and the second metal layer are located between the first composite material layer and the second composite material layer, and the first metal layer and the second metal layer form a liquid cooling channel.

2. The composite liquid cooling plate according to claim 1, characterized in that: The first metal layer and the second metal layer are made of aluminum or aluminum alloy.

3. The composite liquid cooling plate according to claim 1, characterized in that: The thickness of the first composite material layer and the second composite material layer is 1-10 mm; and / or The thickness of the first metal layer and the second metal layer is 10-800 μm; and / or The thermal conductivity of the first composite material layer is ≥0.6 W / mK; and / or The thermal conductivity of the second composite material layer is ≤0.8 W / mK.

4. The composite liquid cooling plate according to claim 3, characterized in that: The thickness of the first composite material layer is 1-3 mm, and the thickness of the second composite material layer is 5-8 mm; and / or The thickness of the first metal layer and the second metal layer is 50-100 μm; and / or The thermal conductivity of the first composite material layer is ≥1.2W / mK; and / or The thermal conductivity of the second composite material layer is ≤0.3 W / mK.

5. The composite liquid cooling plate according to claim 1, characterized in that: The upper cold plate and the lower cold plate are connected by bonding or electromagnetic pulse welding.

6. The composite liquid cooling plate according to any one of claims 1 to 5, characterized in that: The composite liquid cooling plate also includes a liquid inlet pipe and a liquid outlet pipe respectively connected to two ends of the liquid cooling channel.

7. The composite liquid cooling plate according to claim 6, characterized in that: One of the first metal layer and the second metal layer is formed with a flow channel groove, and the flow channel groove and the other metal layer enclose the liquid cooling flow channel; and / or The first metal layer is formed with a first liquid inlet groove and a first liquid outlet groove, and the second metal layer is formed with a second liquid inlet groove and a second liquid outlet groove; The first liquid inlet groove and the second liquid inlet groove form the liquid inlet pipeline; the first liquid outlet groove and the second liquid outlet groove form the liquid outlet pipeline.

8. A battery pack, characterized in that: Comprising a tray, a battery module, a guard plate and a composite liquid cooling plate as described in any one of claims 1 to 7; The battery module is arranged in the tray, and the composite liquid cooling plate is arranged on the upper surface of the battery module and / or the lower surface of the battery module; The guard plate is arranged on the lower surface of the exterior of the tray.

9. The battery pack according to claim 8, characterized in that: The guard plate and the second composite material layer of the composite liquid cooling plate are integrally formed.

10. An electrical device, characterized in that: The electrical equipment comprises the battery pack according to claim 8 or 9.

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