Liquid cooling plate, battery pack and vehicle

Abstract

The utility model provides a liquid cooling plate, a battery pack and a vehicle, and belongs to the technical field of power batteries. The liquid cooling plate comprises a first mounting plate and a second mounting plate; the second mounting plate is a resin-based composite material mounting plate; the second mounting plate and the first mounting plate are connected to form a liquid cooling flow channel; the second mounting plate comprises at least two structural plates which are connected in a laminated mode, and the strength of the at least two structural plates is different. On the basis of ensuring the structural strength of the liquid cooling plate, the heat exchange amount between the liquid cooling plate and the outside is reduced, namely the thermal insulation performance of the liquid cooling plate is improved; in addition, the material cost of the structural plate with relatively low strength is lower, so that the material use cost is also reduced, and the balance between the structural strength and the material cost of the liquid cooling plate is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and specifically relates to a liquid cooling plate, a battery pack and a vehicle. Background Art

[0002] Liquid cooling plate is a highly efficient heat dissipation device, mainly used in applications that require high power density heat dissipation, such as computing devices, servers or electric vehicle battery systems. When used in electric vehicle battery systems, its main function is to meet the heat dissipation requirements of the battery system and perform temperature control to avoid thermal runaway of the battery.

[0003] The liquid cooling plate consists of an upper plate and a lower plate. The upper plate is a flat plate, and the lower plate is formed into a flow channel by stamping. In the related liquid cooling plate technology, both the upper plate and the lower plate are made of aluminum alloy.

[0004] Due to the high thermal conductivity of aluminum alloy, in traditional technology, the thermal insulation performance of the liquid cooling plate is poor, there is a high heat loss, which is not conducive to the full play of the heat exchange performance of the liquid cooling plate. Utility Model Content

[0005] In view of this, the utility model aims to provide a liquid cooling plate, a battery pack and a vehicle, which can solve the problem of poor thermal insulation performance of the liquid cooling plate in traditional technologies.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] A liquid cooling plate, comprising a first mounting plate and a second mounting plate:

[0009] The second mounting plate is a resin-based composite material mounting plate, and the second mounting plate is connected to the first mounting plate to form a liquid cooling channel;

[0010] The second mounting plate includes at least two laminated structural plates, and at least two of the structural plates have different strengths.

[0011] Furthermore, the second mounting plate includes a first structural plate, a third structural plate and at least one second structural plate which are laminated and connected, the second structural plate is arranged between the first structural plate and the third structural plate, and the strength of the first structural plate and the third structural plate is higher than that of the second structural plate.

[0012] Furthermore, the liquid cooling plate also includes structural adhesive;

[0013] The first mounting plate and the second mounting plate are bonded together by the structural adhesive.

[0014] Furthermore, the first structural plate and the third structural plate are carbon fiber resin-based composite material structural plates or aramid fiber resin-based composite material structural plates, and the second structural plate is glass fiber resin-based composite material structural plates or basalt resin-based composite material structural plates.

[0015] Furthermore, the different structural panels are bonded by heat pressing and curing.

[0016] Further, the thickness of the first structural plate is t1, the thickness of the second structural plate is t2, and the thickness of the third structural plate is t3;

[0017] Among them, 0.2mm≤t1≤0.4mm, 0.4mm≤t2≤0.9mm, 0.2mm≤t3≤0.4mm.

[0018] Furthermore, at least two adjacent fiber lines inside at least one of the structural panels intersect with each other at an angle.

[0019] Furthermore, the resin bases of the different structural panels are the same.

[0020] Furthermore, the first mounting plate is an aluminum alloy mounting plate, a copper mounting plate or a silver mounting plate.

[0021] Compared with the prior art, the liquid cooling plate described in the utility model has the following advantages:

[0022] The liquid cooling plate described in the utility model includes a first mounting plate and a second mounting plate, the first mounting plate is the upper plate of the liquid cooling plate, the second mounting plate is the lower plate of the liquid cooling plate, the first mounting plate is connected to the second mounting plate, and a liquid cooling channel is formed between the first mounting plate and the second mounting plate. The second mounting plate is a resin-based composite material mounting plate, which is a fiber-reinforced composite material with resin as the matrix. This material has the characteristics of light weight, high strength, corrosion resistance and easy forming, and has a lower thermal conductivity than aluminum alloy materials. Therefore, the use of resin-based composite materials as mounting plates reduces the heat exchange between the liquid cooling plate and the outside world on the basis of ensuring the structural strength of the liquid cooling plate, that is, the thermal insulation performance of the liquid cooling plate is improved, the heat loss of the liquid cooling plate is reduced, and it is further conducive to the full play of the liquid cooling performance of the liquid cooling plate. In addition, the second mounting plate includes at least two structural plates laminated and connected in the thickness direction, and the strength of at least two structural plates is different. The structural plate with smaller structural strength also has a lower material cost. Therefore, in comparison, the structural plate with greater strength meets the tensile strength requirements of the liquid cooling plate, and the structural plate with reduced strength reduces the material cost. Therefore, on the basis of meeting the structural strength of the liquid cooling plate, the material usage cost is reduced, and a balance between the structural strength of the liquid cooling plate and the material cost is achieved.

[0023] Another object of the present invention is to provide a battery pack to improve the overall thermal insulation performance of the battery pack.

[0024] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0025] A battery pack, comprising a battery pack, a box, a bottom guard plate and any one of the above liquid cooling plates;

[0026] The liquid cooling plate is connected to the battery pack, the bottom guard plate is located on a side of the liquid cooling plate away from the battery pack, the box body has a accommodating cavity, and the battery pack, the liquid cooling plate and the bottom guard plate are fixed in the accommodating cavity.

[0027] Another object of the present invention is to provide a vehicle to improve the thermal insulation performance of the vehicle battery system.

[0028] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0029] A vehicle comprises a battery pack as described in any one of the above items.

[0030] Compared with the prior art, the battery pack and vehicle described in the present invention have the same advantages as the above-mentioned liquid cooling plate, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0032] Figure 1 It is a schematic diagram of the structure of the liquid cooling plate provided in the embodiment of the utility model;

[0033] Figure 2 is a partial cross-sectional schematic diagram of a second mounting plate in an embodiment of the utility model;

[0034] Figure 3 It is a partial cross-sectional schematic diagram of another structure of the second mounting plate in an embodiment of the utility model;

[0035] Figure 4 It is a schematic diagram of the structure of a battery pack provided by an embodiment of the utility model;

[0036] Figure 5 In the present utility model embodiment Figure 4 Schematic diagram along direction A;

[0037] Figure 6 It is a schematic diagram of the liquid cooling channel structure in an embodiment of the utility model.

[0038] Reference numerals:

[0039] 1-liquid cooling plate, 11-first mounting plate, 12-second mounting plate, 121-first structural plate, 122-second structural plate, 123-third structural plate, 13-liquid cooling channel, 14-groove, 2-battery pack, 3-box, 4-bottom guard plate. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0041] The liquid cooling plate, battery pack and vehicle provided by the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] The utility model embodiment provides a liquid cooling plate, referring to Figure 1 and Figure 2 The liquid cooling plate includes a first mounting plate 11 and a second mounting plate 12: the second mounting plate 12 is a resin-based composite material mounting plate, and the second mounting plate 12 is connected to the first mounting plate 11 to form a liquid cooling channel 13; the second mounting plate 12 includes at least two laminated structural plates, and the strength of at least two of the structural plates is different.

[0043] Specifically, if Figure 1 The schematic diagram of the structure of the liquid cooling plate 1 provided by the embodiment of the utility model is shown, and the liquid cooling plate 1 includes a first mounting plate 11 and a second mounting plate 12. The first mounting plate 11 is the upper plate of the liquid cooling plate, and the second mounting plate 12 is the lower plate of the liquid cooling plate. The first mounting plate 11 is a flat plate, and a groove 14 is formed on the second mounting plate 12. When viewed from the direction of the second mounting plate 12 toward the first mounting plate 11, the bottom of the groove 14 is connected to the lower surface of the first mounting plate 11, and the groove 14 separates the space between the first mounting plate 11 and the second mounting plate 12 into a plurality of liquid cooling channels 13. Figure 6 The schematic diagram of the structure of the liquid cooling channel 13 in the embodiment of the utility model is shown. The liquid cooling channel 13 can extend along the X direction and / or the Y direction. The liquid cooling channel 13 is filled with a liquid cooling medium, which includes but is not limited to water, ethylene glycol aqueous solution or pure ethylene glycol, among which water is the most widely used liquid cooling medium. When the liquid cooling plate 1 is used in a battery pack, the liquid cooling medium flows in the liquid cooling channel 13 to exchange heat with the battery pack 2 arranged above the first mounting plate 11, taking away the heat generated by the battery pack 2 during operation or keeping the battery pack 2 warm in a cold environment to maintain the normal operating temperature of the battery pack 2.

[0044] Specifically, the first mounting plate 11 is a metal plate, and the second mounting plate 12 is a resin-based composite material mounting plate. The resin-based composite material is also called fiber-reinforced plastic. It is a material formed by a fiber and a resin-based composite material, wherein the resin-based composite material is the basis of the composite material, including resin or synthetic resin, which can be composed of a single resin substrate or a composite of multiple resin substrates. The resin-based composite material has the characteristics of light weight, high strength, corrosion resistance and easy molding, and its thermal conductivity is lower than that of the aluminum alloy plate. In addition, compared with the aluminum alloy plate, the resin-based composite material is softer in texture, and the second mounting plate 12 formed by processing is convenient for processing to form a complex liquid cooling channel 13, thereby improving the liquid cooling heat exchange efficiency. The connection method between the first mounting plate 11 and the second mounting plate 12 includes but is not limited to mechanical connection, bonding, friction welding or laser welding. When the liquid cooling plate 1 provided in this embodiment is applied to the battery pack, the second mounting plate 12 is located at the bottom of the battery pack, and the resin-based composite material is used. On the basis of ensuring the structural strength of the liquid cooling plate 1, the heat exchange between the liquid cooling plate 1 and the outside world is reduced to avoid affecting the heat exchange performance of the liquid cooling plate 1 due to excessive heat loss. Among them, according to the characteristics of the processing behavior, the resin base of the second mounting plate 12 is a thermosetting resin or a thermoplastic resin, wherein when a thermosetting resin is used, it includes but is not limited to epoxy resin, polyurethane resin or unsaturated polyester resin; when a thermoplastic resin is used, it includes but is not limited to PP (Polypropylene), PA (Polyamide) or PBT (polybutylece terephthalate). The specific selection principle of the resin base should be based on the principle that the resin base does not interact with the liquid cooling medium to affect the mechanical properties. For example, the embodiment of the utility model selects a modified polyurethane resin as the resin base material. The fibers of the second mounting plate 12 are chopped or continuous fibers. In order to enhance the mechanical properties and improve the material strength, for example, the embodiment of the utility model selects continuous fibers as the composite material composition of the second mounting plate 12, including glass fibers, carbon fibers, basalt fibers, aramid fibers, asbestos fibers or boron fibers.

[0045] Specifically, Figure 2 and Figure 3 A partial cross-sectional schematic diagram of the second mounting plate 12 under two layered structures is shown. The second mounting plate 12 includes at least two laminated structural plates. The strength of the at least two structural plates is different. The strength of the structural plate mainly depends on the fiber strength in the resin-based composite material. Different structural plates can achieve different fiber strengths by setting different fiber materials, different fiber densities or different fiber weaving angles. The second mounting plate 12 can be composed of two layers of structural plates, three layers of structural plates or more layers of structural plates. When the number of structural plate layers is more, the thickness of the second mounting plate 12 is larger and the structural strength is higher. However, the reinforcement design requirements of the liquid cooling plate 1 and the battery pack should be comprehensively considered. For example, Figure 2 The second mounting plate 12 includes a first structural plate 121 and a second structural plate 122, wherein the first structural plate 121 is located on a side closer to the first mounting plate 11, and the strength of the first structural plate 121 can be set to be greater than the strength of the second structural plate 122, or the strength of the first structural plate 121 can be set to be less than the strength of the second structural plate 122. Figure 3 , the second mounting plate 12 includes a first structural plate 121, a second structural plate 122 and a third structural plate 123. The strengths of the first structural plate 121, the second structural plate 122 and the third structural plate 123 can be set to decrease in sequence, or the strengths of the structural plates on both sides, i.e., the first structural plate 121 and the third structural plate 123, can be set to be greater than the strength of the second structural plate 122. The fibers of the structural plates with greater strength can be selected from carbon fiber or aramid fiber, and the fibers of the structural plates with less strength can be selected from glass fiber or basalt fiber. In comparison, the structural plates with greater strength meet the requirements of tensile strength and bursting pressure resistance of the liquid cooling plate, and the structural plates with reduced strength reduce the material cost. For example, compared with carbon fiber, the material price of glass fiber and basalt fiber is lower, and their fiber strength is also lower.

[0046] The liquid cooling plate provided by the embodiment of the utility model includes a first mounting plate and a second mounting plate connected to each other, wherein the second mounting plate is a resin-based composite material mounting plate, and its thermal conductivity is lower than that of the aluminum alloy plate, thereby reducing the heat exchange between the liquid cooling plate and the outside world, improving the thermal insulation performance of the liquid cooling plate, reducing the heat loss of the liquid cooling plate, and further facilitating the full play of the liquid cooling performance of the liquid cooling plate. In addition, the second mounting plate is formed by laminating and connecting at least two layers of structural plates, and the price of the structural plate with reduced strength is also lower. On the basis of meeting the structural strength of the liquid cooling plate, the material use cost is reduced, and a balance between the structural strength of the liquid cooling plate and the material cost is achieved.

[0047] Further, see Figure 1 and Figure 3 The second mounting plate 12 includes a first structural plate 121, a third structural plate 123 and at least one second structural plate 122 which are laminated and connected. The second structural plate 122 is arranged between the first structural plate 121 and the third structural plate 123. The strength of the first structural plate 121 and the third structural plate 123 is higher than that of the second structural plate 122.

[0048] Specifically, if Figure 1 and Figure 3As shown, along the thickness direction, the second mounting plate 12 includes a first structural plate 121, a second structural plate 122 and a third structural plate 123 which are sequentially stacked and connected. Among them, the first structural plate 121 and the third structural plate 123 are located on the outside of the second mounting plate 12, and the second structural plate 122 is sandwiched between the first structural plate 121 and the third structural plate 123, that is, the second structural plate 122 is located inside the second mounting plate 12. Among them, there is at least one second structural plate 122, so in this embodiment, the second mounting plate 12 can be provided with at least three layers of structural plates, specifically three layers, four layers or more layers, to form a sandwich structure. When the liquid cooling plate of the embodiment of the utility model is applied to the battery pack, the first structural plate 121 is close to the first mounting plate 11, and the third structural plate 123 is away from the first mounting plate 11, and the third structural plate 123 is close to the bottom guard plate 4. Different fiber materials can be used for each layer of structural plate to give full play to the strength characteristics of different fiber materials. The fiber strength of the first structural plate 121 and the third structural plate 123 is higher than that of the second structural plate 122. On the one hand, the first structural plate 121 and the third structural plate 123 located on the outside bear the main external impact force, and the higher fiber strength is used to meet the structural strength requirements of the liquid cooling plate 1; on the other hand, compared with the outer structural plate, the fiber strength of the second structural plate 122 is lower, and its material cost is also lower, which reduces the overall material use cost and avoids excess strength performance. Therefore, the second mounting plate 12 in the embodiment of the utility model has at least three layers of stacking design means, which reduces the material use cost on the basis of meeting the structural strength of the liquid cooling plate.

[0049] Further, see Figure 1 The liquid cooling plate further includes structural adhesive; the first mounting plate 11 and the second mounting plate 12 are bonded together by the structural adhesive.

[0050] Specifically, in the conventional technology, since the upper plate and the lower plate of the liquid cooling plate are both aluminum alloy plates, the upper plate and the lower plate of the liquid cooling plate are connected by brazing. Figure 1As shown, in the embodiment of the utility model, structural adhesive is applied between the first mounting plate 11 and the second mounting plate 12, and the first mounting plate 11 and the second mounting plate 12 are bonded by the structural adhesive. That is, before connection, the structural adhesive can be applied to the lower surface of the first mounting plate 11, or, applied to the upper surface of the second mounting plate 12. Since the resin-based composite material cannot be connected by brazing, the bonding form is adopted to adapt to the connection between the metal plate and the resin-based composite material plate. Compared with the brazing connection method, in terms of material forming performance, the stress distribution is uniform, the fatigue resistance is good, and the problems of warping and deformation that may exist after welding are avoided, and it has the effect of vibration reduction and energy absorption, and increases the stability of the connection between the first mounting plate 11 and the second mounting plate 12. In terms of performance, it is convenient and safe to use, and reduces the high energy consumption during welding. The structural adhesive includes but is not limited to polyurethane structural adhesive, silicone rubber structural adhesive, epoxy resin structural adhesive or acrylate structural adhesive. The specific selection should be adapted to the resin base of the second mounting plate 12, and the principle should also be that the structural adhesive does not interact with the liquid cooling medium to affect the mechanical properties. Exemplarily, the structural adhesive of the embodiment of the utility model is selected from polyurethane structural adhesive, which has high bonding strength, impact resistance, good temperature resistance and corrosion resistance.

[0051] Further, see Figure 3 The first structural plate 121 and the third structural plate 123 are carbon fiber resin-based composite material structural plates or aramid fiber resin-based composite material structural plates, and the second structural plate 122 is a glass fiber resin-based composite material structural plate or a basalt resin-based composite material structural plate.

[0052] Specifically, if Figure 3 As shown, the embodiment of the utility model adopts three-layer structural plates to connect and form the second mounting plate 12. Carbon fiber or aramid fiber with higher fiber structure strength is selected as the composite material composition of the first structural plate 121 and the third structural plate 123, and glass fiber or basalt fiber with lower fiber strength is selected as the composite material composition of the second structural plate 122. Exemplarily, the following combination methods can be adopted: the first structural plate 121 and the third structural plate 123 are carbon fiber resin-based composite material structural plates, and the second structural plate 122 is a glass fiber resin-based composite material structural plate; the first structural plate 121 and the third structural plate 123 are aramid fiber resin-based composite material structural plates, and the second structural plate 122 is a glass fiber resin-based composite material structural plate; the first structural plate 121 and the third structural plate 123 are carbon fiber resin-based composite material structural plates, and the second structural plate 122 is a basalt resin-based composite material structural plate; the first structural plate 121 and the third structural plate 123 are aramid fiber resin-based composite material structural plates, and the second structural plate 122 is a basalt resin-based composite material structural plate.

[0053] Furthermore, the different structural panels are bonded by heat pressing and curing.

[0054] Specifically, each layer of the structural panel is formed by hot pressing and curing, such as Figure 2 When a two-layer structural plate is used, the first structural plate 121 and the second structural plate 122 are heat-pressed and cured to form the second mounting plate 12 as a whole. Figure 3 When a three-layer structural plate is used, the first structural plate 121, the second structural plate 122 and the third structural plate 123 are stacked in order from top to bottom, and then bonded by hot pressing and curing to form the second mounting plate 12 as a whole. It is formed and cured under pressure and heating conditions to obtain a mounting plate with a specified shape, density, hardness and mechanical strength. This material molding method can obtain better surface quality and formability, and the process is easy to control.

[0055] Further, see Figure 3 The thickness of the first structural plate 121 is t1, the thickness of the second structural plate 122 is t2, and the thickness of the third structural plate 123 is t3; wherein, 0.2mm≤t1≤0.4mm, 0.4mm≤t2≤0.9mm, and 0.2mm≤t3≤0.4mm.

[0056] Specifically, if Figure 3 As shown, the thickness of the first structural plate 121 is t1, 0.2mm≤t1≤0.4mm; the thickness of the second structural plate 122 is t2, 0.4mm≤t2≤0.9mm; the thickness of the third structural plate 123 is t3, 0.2mm≤t3≤0.4mm. The overall thickness of the second mounting plate 12 is t4, 1.2mm≤t4≤1.3mm. The thickness of each layer of structural plate should not be too low so as not to affect the fiber strength, and the thickness of each layer of structural plate should not be too large, which increases the material cost and is not conducive to achieving the lightweight requirements.

[0057] Furthermore, at least two adjacent fiber lines inside at least one of the structural panels intersect with each other at an angle.

[0058] Specifically, the second mounting plate 12 is formed by a composite of continuous fibers and a resin matrix, wherein the continuous fibers can be woven from fiber lines in the same direction or fiber lines at a certain angle to each other. For example, when the second mounting plate 12 is composed of three layers of structural plates, at least one of the first structural plate 121, the second structural plate 122, and the third structural plate 123 has fiber lines woven at a certain angle to each other. According to the strength performance test results, the continuous fibers are perpendicular to each other, that is, when the fibers are cross-woven at 90°, the fiber structure strength is the highest.

[0059] Furthermore, the first mounting plate 11 is an aluminum alloy mounting plate, a copper mounting plate or a silver mounting plate.

[0060] Specifically, the first mounting plate 11 is a metal mounting plate, and the materials that can be selected include copper, aluminum alloy or silver. Considering the material cost and thermal conductivity-related factors, this embodiment uses an aluminum alloy mounting plate, and the aluminum alloy material has the characteristics of low density, high strength and low thermal conductivity, including but not limited to 3 series, 5 series or 6 series aluminum alloy. When the aluminum alloy mounting plate is connected to the battery pack 2, it is convenient for heat exchange between the liquid cooling plate 1 and the battery pack 2, and the operating temperature of the battery pack 2 is effectively controlled.

[0061] Furthermore, the resin bases of the different structural panels are the same.

[0062] Specifically, since different resin bases cannot be effectively fused together after hot pressing and curing, the performance of the resin-based composite material board is affected. Therefore, the resin bases of different structural boards are the same. For example, when a three-layer structural board is used, the first structural board 121, the second structural board 122 and the third structural board 123 use the same resin base to ensure that the three-layer structural board forms a second mounting board 12 with stable performance during hot curing, and the resin bases of different layers are effectively fused with each other. Since the resin-based composite material is formed by a resin base and a fiber material, in order to ensure the effectiveness of hot pressing and curing, the resin bases of different structural boards are controlled to be the same. At the same time, since the strength of the structural board mainly depends on the strength of the fiber material, different structural boards use different fiber materials to make the strengths of different structural boards different. For example, the fiber of the first structural board 121 uses carbon fiber, the fiber of the second structural board 122 uses glass fiber, and the fiber of the third structural board 123 uses aramid fiber.

[0063] The utility model also provides a battery pack, referring to Figure 4 and Figure 5 , comprising a battery pack 2, a box body 3, a bottom guard plate 4 and the liquid cooling plate 1 described in any one of the above embodiments; the liquid cooling plate 1 is connected to the battery pack 2, the bottom guard plate 4 is located on the side of the liquid cooling plate 1 away from the battery pack 2, the box body 3 has a accommodating cavity, and the battery pack 2, the liquid cooling plate 1 and the bottom guard plate 4 are fixed in the accommodating cavity.

[0064] Specifically, if Figure 4 and Figure 5 As shown, the battery pack includes a battery pack 2, a box body 3, a bottom guard plate 4 and a liquid cooling plate 1. The battery pack 2 is formed by connecting a plurality of battery cells, and the liquid cooling plate 1 is connected to the bottom of the battery pack 2. Specifically, the first mounting plate 11 is connected to the battery pack 2 by a thermally conductive structural adhesive to improve the heat exchange efficiency. The bottom guard plate 4 is located on the side of the liquid cooling plate 1 away from the battery pack 2, that is, at the lower part of the liquid cooling plate 1, to improve the protective strength and impact resistance of the battery pack. The battery pack 2, the liquid cooling plate 1 and the bottom guard plate 4 are all fixed in the accommodating cavity of the box body 3. The liquid cooling plate 1 provided in the embodiment of the utility model is adopted to improve the overall thermal insulation performance of the battery pack.

[0065] An embodiment of the utility model further provides a vehicle, comprising the battery pack described in any one of the aforementioned embodiments. In a vehicle equipped with the battery pack, the thermal insulation performance of the vehicle battery system can be improved, and the operating temperature of the battery system can be controlled to be maintained within a normal range.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: It comprises a first mounting plate (11) and a second mounting plate (12): The second mounting plate (12) is a resin-based composite material mounting plate, and the second mounting plate (12) is connected to the first mounting plate (11) to form a liquid cooling channel (13); The second mounting plate (12) comprises at least two laminated structural plates, and at least two of the structural plates have different strengths.

2. The liquid cooling plate according to claim 1, characterized in that: The second mounting plate (12) comprises a first structural plate (121), a third structural plate (123) and at least one second structural plate (122) which are laminated and connected; The second structural plate (122) is arranged between the first structural plate (121) and the third structural plate (123), and the strength of the first structural plate (121) and the third structural plate (123) is higher than the strength of the second structural plate (122).

3. The liquid cooling plate according to claim 1 or 2, characterized in that: The liquid cooling plate also includes structural adhesive; The first mounting plate (11) and the second mounting plate (12) are bonded together by the structural adhesive.

4. The liquid cooling plate according to claim 2, characterized in that: The first structural plate (121) and the third structural plate (123) are carbon fiber resin-based composite material structural plates or aramid fiber resin-based composite material structural plates, and the second structural plate (122) is a glass fiber resin-based composite material structural plate or a basalt resin-based composite material structural plate.

5. The liquid cooling plate according to claim 1 or 2, characterized in that: The different structural panels are bonded by heat pressing and curing.

6. The liquid cooling plate according to claim 2, characterized in that: The thickness of the first structural plate (121) is t1, the thickness of the second structural plate (122) is t2, and the thickness of the third structural plate (123) is t3; Among them, 0.2mm≤t1≤0.4mm, 0.4mm≤t2≤0.9mm, 0.2mm≤t3≤0.4mm.

7. The liquid cooling plate according to claim 1 or 2, characterized in that: At least two adjacent fiber lines inside at least one of the structural panels intersect with each other at an angle.

8. The liquid cooling plate according to claim 5, characterized in that: The resin bases of the different structural panels are the same.

9. The liquid cooling plate according to claim 1, characterized in that: The first mounting plate (11) is an aluminum alloy mounting plate, a copper mounting plate or a silver mounting plate.

10. A battery pack, characterized in that: The battery pack comprises a battery group (2), a box body (3), a bottom guard plate (4) and a liquid cooling plate according to any one of claims 1 to 9; The liquid cooling plate is connected to the battery pack (2), the bottom guard plate (4) is located on a side of the liquid cooling plate away from the battery pack (2), the box body (3) has a receiving cavity, and the battery pack (2), the liquid cooling plate and the bottom guard plate (4) are fixed in the receiving cavity.

11. A vehicle, characterized in that: The vehicle includes the battery pack described in claim 10 .

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