Liquid cooling plate and preparation method and application thereof

Abstract

The application provides a liquid cooling plate and a preparation method and application thereof. The liquid cooling plate comprises a first composite plate comprising a composite first core material layer aluminum alloy and a first protective layer aluminum alloy, and a second composite plate with a groove comprising a sequentially-composed brazing layer aluminum alloy, a second protective layer aluminum alloy and a second core material layer aluminum alloy; wherein the first protective layer aluminum alloy and the brazing layer aluminum alloy are welded together, so that the groove forms a flow channel. The liquid cooling plate provided by the application is provided with the protective layer aluminum alloy on both sides of the flow channel, which can effectively prevent the corrosion of the cooling liquid on the core material layer aluminum alloy, prevent the corrosion perforation of the core material layer aluminum alloy from inside to outside, form corrosion cavities to cause leakage, and further cause accidents.

Description

Technical Field

[0001] This application relates to the field of new energy vehicles, specifically to a liquid cooling plate, its preparation method, and its application. Background Technology

[0002] The power batteries of new energy vehicles are highly sensitive to temperature. During use, the battery temperature gradually rises, and when the temperature becomes too high, it can lead to thermal runaway. Therefore, cooling the battery pack is crucial. Liquid cooling plates, as an important component of liquid cooling systems, ensure full contact between their surface and the battery surface. The coolant flowing inside the liquid cooling plate carries away heat from the battery through heat exchange, thereby reducing the battery temperature.

[0003] Because the liquid cooling plate is in direct contact with the battery, if the liquid cooling plate corrodes and perforates, coolant will leak into the power battery, causing a short circuit and potentially a fire, posing a significant safety risk. Therefore, the liquid cooling plate must have sufficient corrosion resistance. With the continuous promotion of new energy vehicles, especially the new national standard GB 29743.2-2025 for electric vehicle coolants, which imposes higher requirements on chloride and sulfate ions and increases the conductivity requirements for antifreeze, the increased ion requirements in electric vehicle coolants and the reduced amount of corrosion inhibitors place even higher demands on the corrosion resistance of liquid cooling plate materials.

[0004] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Summary of the Invention

[0005] This application aims to provide a liquid cooling plate that has sufficient corrosion resistance without increasing thickness.

[0006] The first aspect of this application provides a liquid-cooled plate, comprising: The first composite plate includes a composite first core layer of aluminum alloy and a first protective layer of aluminum alloy; and The second composite plate, with grooves, comprises sequentially composited brazing layer aluminum alloy, second protective layer aluminum alloy, and second core layer aluminum alloy. The first protective layer aluminum alloy and the brazing layer aluminum alloy are welded together, so that the groove forms a flow channel.

[0007] In some embodiments of this application, the first protective layer aluminum alloy and the second protective layer aluminum alloy comprise the following components by mass percentage: Si≤1%, Fe≤0.7%, Cu≤0.2%, Mn0.2~2.0%, Zn0.8~5.0%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities.

[0008] In some embodiments of this application, the first core layer aluminum alloy and the second core layer aluminum alloy comprise the following components by mass percentage: Si 0.1~1%, Fe≤0.7%, Cu 0.25~1.1%, Mn 1.0~2.0%, Zn≤0.1%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities.

[0009] In some embodiments of this application, the brazing layer aluminum alloy is an Al-Si alloy comprising 5.0 to 11.0% Si by mass.

[0010] In some embodiments of this application, the first protective layer aluminum alloy accounts for 7.5-25% of the total thickness of the first composite plate, the brazing layer aluminum alloy accounts for 5-15% of the total thickness of the second composite plate, and the second protective layer aluminum alloy accounts for 7.5-25% of the total thickness of the second composite plate.

[0011] A second aspect of this application provides a method for manufacturing any of the liquid-cooled plates described above, comprising: The alloys are respectively formulated according to the set composition ratio, and then processed by melting and casting, milling, heating, hot rolling and cold rolling to produce the first composite preform plate and the second composite preform plate; The first composite preform and the second composite preform are annealed respectively, wherein the annealing temperature of the first composite preform and the second composite preform is 200~420℃ and the annealing holding time is 2~4h respectively; The first composite preform is cut to obtain the first composite plate; The second composite preform is sheared and pressed to obtain a second composite plate with the groove; and The first composite plate and the second composite plate are welded together to form the liquid cooling plate.

[0012] In some embodiments of this application, during the heating step, the core material layer ingot used to roll the second composite preform is homogenized at 600±20℃ in a heating furnace for 10~24h.

[0013] In some embodiments of this application, the welding is performed in a CAB furnace at 605±15°C.

[0014] A third aspect of this application provides a battery comprising any of the liquid cooling plates described above.

[0015] A fourth aspect of this application provides a new energy vehicle that includes the aforementioned battery.

[0016] The liquid cooling plate provided in this application has a protective aluminum alloy layer on both sides of the flow channel, which can effectively prevent the coolant from corroding the core material aluminum alloy, and prevent the core material aluminum alloy from corroding and perforating from the inside out, forming corrosion holes that lead to leakage and thus accidents.

[0017] The brazed liquid cooling plate prepared by the above method has the characteristics of moderate strength, easy forming and corrosion resistance.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The embodiments of this application are described in detail below with reference to the accompanying drawings. These drawings, which form part of this application, are used to provide a further understanding of the application. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0020] Figure 1 A schematic diagram of the structure of a liquid cooling plate provided in an embodiment of this application is shown.

[0021] Figure 2 A process flow diagram for preparing a liquid cooling plate according to an embodiment of this application is shown.

[0022] Figure label: 100. Liquid cooling plate; 110. First composite plate; 111. First core material layer aluminum alloy; 112. First protective layer aluminum alloy; 120. Second composite plate; 121. Brazing layer aluminum alloy; 122. Second protective layer aluminum alloy; 123. Second core material layer aluminum alloy; A. Groove. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] The specific embodiments of this application will be described in more detail below with reference to the accompanying drawings and examples, so as to better understand the solution of this application and its advantages in various aspects. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit this application.

[0026] Figure 1 An embodiment of the present application shows a liquid cooling plate 100, including a first composite plate 110 and a second composite plate 120.

[0027] like Figure 1 As shown, the first composite plate 110 includes a first core material layer aluminum alloy 111 and a first protective layer aluminum alloy 112.

[0028] Optionally, the first core layer aluminum alloy 111 is a 3003mod alloy, which may include the following components by mass percentage: Si 0.1~1%, Fe≤0.7%, Cu 0.25~1.1%, Mn 1.0~2.0%, Zn≤0.1%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities. This alloy has relatively high upper limits for Si, Cu, and Mn, therefore, scrap or offcuts of 3-series and 4-series aluminum alloys containing high Si, high Mn, and Cu can be used as raw materials, reducing the use of pure aluminum ingots and achieving cost savings. The Si content must not exceed 1%; if it exceeds 1%, the risk of overheating of the core material during brazing increases significantly. The Cu content of the core alloy disclosed in this invention ranges from 0.25~1.1%. When the Cu content exceeds 0.1%, an Al2Cu phase will form, which helps improve the strength of the material. However, the Cu content should not be too high, otherwise it will reduce the corrosion resistance of the alloy. Preferably, the Cu content in this disclosure is not higher than 1.1%.

[0029] Optionally, the first protective layer aluminum alloy 112 is a 7072mod alloy, which may include the following components by mass percentage: Si≤1%, Fe≤0.7%, Cu≤0.2%, Mn0.2~2.0%, Zn0.8~5.0%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities. Zn can lower the potential of the protective layer alloy. The protective layer alloy must contain sufficient Zn to create a sufficient potential difference between the protective layer and the core alloy. The potential of the protective layer alloy must be at least 80mV lower than that of the core alloy to effectively protect the core alloy. During use, the protective layer alloy corrodes preferentially. With increasing usage time, pitting corrosion occurs in the protective layer alloy. In the corrosion pit area, due to the sufficient potential difference, electrochemical corrosion occurs between the protective layer alloy and the core alloy. The lower potential of the protective layer leads to preferential corrosion, and the corrosion pit expands along the plate surface, increasing in size, but no longer extending to the core material along the plate thickness direction, until the lower potential protective layer alloy is completely consumed along the plate surface. The protective layer alloy then plays its role in protecting the core material. As the Zn content increases, the alloy potential decreases significantly. When the Zn content is greater than 4%, increasing the Zn content has almost no effect on reducing the alloy potential. However, since the melting point of Zn is only 419.5℃, a certain amount of Zn will volatilize during the brazing process. The Zn content was 4.5% before brazing and about 3.5% after brazing. Considering this factor, the preferred Zn content in this disclosure is no more than 5%.

[0030] Optionally, the first protective layer aluminum alloy 112 accounts for 7.5 to 25% of the total thickness of the first composite plate 110.

[0031] like Figure 1 As shown, the second composite plate 120 includes a brazing layer aluminum alloy 121, a second protective layer aluminum alloy 122, and a second core layer aluminum alloy 123 sequentially bonded together. The second composite plate 120 also has a groove A. The brazing layer aluminum alloy 121 and the first protective layer aluminum alloy 112 are welded together, at which point the groove A becomes a closed flow channel.

[0032] Optionally, the brazing layer aluminum alloy 121 is an Al-Si alloy comprising 5.0 to 11.0% Si by mass.

[0033] Optionally, the second protective layer aluminum alloy 122 is a 7072mod alloy, which may include the following components by mass percentage: Si≤1%, Fe≤0.7%, Cu≤0.2%, Mn0.2~2.0%, Zn0.8~5.0%, Ti≤0.3%, with the remainder being Al and unavoidable impurities less than 0.15%. The composition of the second protective layer aluminum alloy 122 and the first protective layer aluminum alloy 112 can be exactly the same or different. The design concept of the composition of the second protective layer aluminum alloy 122 is similar to that of the first protective layer aluminum alloy 112, and will not be repeated here.

[0034] Optionally, the second core layer aluminum alloy 123 is a 3003mod alloy, which may include the following composition by mass percentage: Si 0.1~1%, Fe≤0.7%, Cu 0.25~1.1%, Mn 1.0~2.0%, Zn≤0.1%, Ti≤0.3%, with the remainder being Al and unavoidable impurities less than 0.15%. The composition of the second core layer aluminum alloy 123 and the first core layer aluminum alloy 111 can be exactly the same or different. The design concept of the composition of the second core layer aluminum alloy 123 is similar to that of the first core layer aluminum alloy 111, and will not be repeated here.

[0035] Optionally, the brazing layer aluminum alloy 121 accounts for 5 to 15% of the total thickness of the second composite plate 120, and the second protective layer aluminum alloy 122 accounts for 7.5 to 25% of the total thickness of the second composite plate 120.

[0036] The liquid cooling plate provided in this application has a protective aluminum alloy layer on both sides of the flow channel, which can effectively prevent the coolant from corroding the core material aluminum alloy, and prevent the core material aluminum alloy from corroding and perforating from the inside out, forming corrosion holes that lead to leakage and thus accidents.

[0037] Figure 2 A method for preparing the above-mentioned liquid cooling plate according to an embodiment of this application is shown, including the following steps S1 to S5.

[0038] S1: The alloys are produced according to the set composition ratio, and then processed by melting, casting, milling, heating, hot rolling, and cold rolling to form the first composite preform and the second composite preform.

[0039] Specifically, it may include the following steps: 1) Melting and casting: Melting is carried out according to the element ratio, followed by melting, electromagnetic stirring, slag removal, degassing, refining, and semi-continuous casting to obtain flat ingots of a certain size.

[0040] 2) Milling the ingot: Mill the flat ingot according to the specifications. The milling amount on the top and bottom surfaces is 5~15mm, and the milling amount on the small sides is 0~10mm.

[0041] 3) Ingot heating: The ingot is heated and held at a specific temperature in a heating furnace. The core material ingot used to roll the second composite preform plate needs to be homogenized because the second composite plate needs to be stamped with a flow channel shape and the material needs to have sufficient uniform ductility. The purpose of this process is to remove element segregation during the solidification process of the ingot. The homogenization method is to heat the ingot at 600±20℃ in a heating furnace for 10~24h. After heating, the ingot is taken out of the furnace and cooled.

[0042] Next, the alloy layers used to manufacture the first composite plate and the alloy layers used to manufacture the second composite plate (with the core material already homogenized) are stacked sequentially and welded together along the edges to prevent slippage between the layers. The fixed multilayer ingot is then held at 500±50℃ for 2~6 hours.

[0043] 4) Hot rolling: After the casting billet is welded and fixed in each layer, it is hot rolled to a thickness of 3~10mm in multiple passes and then rolled. The initial rolling temperature is 500±20℃ and the final rolling temperature is not lower than 300℃.

[0044] 5) Cold rolling: The hot-rolled material is cold-rolled in multiple passes to a thickness of 0.8~3.0mm and then coiled to obtain a first composite preform for preparing the first composite plate and a second composite preform for preparing the second composite plate.

[0045] S2: Anneal the first composite preform and the second composite preform respectively.

[0046] The annealing temperature of the first composite preform and the second composite preform is 200~420℃, and the annealing holding time is 2~4h.

[0047] S3: Cut the first composite preform to obtain the first composite plate.

[0048] S4: The second composite preform is sheared and pressed to obtain a second composite plate with grooves.

[0049] The first composite preform and the second composite preform are cut into different sizes according to specific specifications. After the second composite preform is cut, it is stamped into a specific groove structure from top to bottom along the brazing layer aluminum alloy using a mold, so that it can be brazed with the first composite plate to form a liquid cooling plate channel.

[0050] S5: Weld the first composite plate and the second composite plate together to form a liquid cooling plate.

[0051] The first protective layer aluminum alloy of the first composite plate is assembled with the brazing layer aluminum alloy of the second composite plate, and then CAB brazing is performed at 605±15℃ for 5~60min to obtain the liquid cooling plate.

[0052] The brazed liquid cooling plate prepared by the above method has the characteristics of moderate strength, easy forming and corrosion resistance.

[0053] The present invention will now be described with reference to specific embodiments. The process conditions and values ​​used in the following embodiments and comparative examples are exemplary, and their possible ranges are as shown in the foregoing description of the invention. For process parameters not specifically noted, conventional techniques can be used. Unless otherwise specified, the reagents and instruments used in the technical solutions provided by the present invention can all be purchased from conventional channels or the market. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0054] Example 1 This embodiment prepares a liquid-cooled plate, and the composition of the alloy used is shown in Table 1: Table 1

[0055] The specific preparation steps are as follows: Alloys were formulated according to the proportions in Table 1. After melting the raw materials, electromagnetic stirring, slag removal, degassing, refining, and semi-continuous casting, Al-Si ingots, 3003mod ingots, and 7072mod ingots were obtained, with dimensions of 450mm × 1290mm × 5000mm. The 3003mod ingots used for the second core layer aluminum alloy underwent homogenization treatment by heating in a furnace at 600±20℃ for 10~24 hours, followed by cooling. 10mm was milled off each side of the Al-Si, 3003mod, and 7072mod ingots. The Al-Si ingots were then hot-rolled to a thickness of 60mm, and the 7072mod ingots were hot-rolled to thicknesses of 94mm and 108mm respectively, and then cut into 4800mm long sheets.

[0056] A 94mm thick 7072mod alloy sheet and a 430mm thick 3003mod alloy sheet are stacked vertically and spot-welded together. The two composite blanks are then heated in a furnace at 500℃ for 10-16 hours followed by a 2-6 hour holding period. After the holding period, the blanks are removed from the furnace to obtain a two-layer composite material. A 60mm thick Al-Si sheet, a 108mm thick 7072mod sheet, and a homogenized 430mm thick 3003mod sheet are stacked vertically and spot-welded together. The three-layer composite blanks are then heated in a furnace at 500℃ for 10-16 hours followed by a 2-6 hour holding period. After the holding period, the blanks are removed from the furnace to obtain a three-layer composite material.

[0057] The two-layer and three-layer composite materials were hot-rolled to 6.0 mm and coiled to form two-layer alloy hot-rolled coils and three-layer alloy hot-rolled coils, respectively. After the two-layer and three-layer alloy hot-rolled coils cooled to room temperature, they were cold-rolled to 1.0 mm in multiple passes to obtain the first composite preform and the second composite preform, respectively. The first and second composite preforms were then annealed in an N2 protected annealing furnace at 380℃±10℃ for 2~4 hours.

[0058] The first composite preformed plate after annealing is cut to a certain size to obtain the first composite plate. The second composite preformed plate after annealing is cut to a certain size, and then placed with the brazed aluminum alloy side facing upwards. It is then stamped with a die to form an upward-facing groove to obtain the second composite plate.

[0059] The first protective layer aluminum alloy of the first composite plate and the brazing layer aluminum alloy of the second composite plate are assembled face-to-face and clamped by tooling. The assembled composite plates are then brazed at a high temperature of 600~620℃ to obtain a liquid cooling plate. In the liquid cooling plate, the thickness of the first protective layer aluminum alloy in the first composite plate accounts for 18%, and the thickness of the brazing layer aluminum alloy in the second composite plate accounts for 10% and the thickness of the second protective layer aluminum alloy accounts for 18%.

[0060] Mechanical property testing revealed that the post-weld liquid cooling plate exhibited a tensile strength of 165 MPa, a yield strength of 65 MPa, and an elongation of 24%. After brazing, the potential of the second protective layer aluminum alloy was measured to be -810 mV, while the potential of the second core layer aluminum alloy was -690 mV. The potential of the second protective layer aluminum alloy was 120 mV lower than that of the second core layer aluminum alloy, meeting the requirement that the protective layer potential be at least 80 mV lower than that of the core layer. Corrosion testing of the brazed liquid cooling plate using coolant conforming to the new national standard (GB 29743.2-2025) showed that it met the corrosion requirements.

[0061] Example 2 This embodiment prepares a liquid cooling plate, which differs from Example 1 in the alloy composition, as detailed in Table 2: Table 2

[0062] The preparation steps are exactly the same as in Example 1, and will not be repeated here.

[0063] Mechanical property testing revealed that the post-weld liquid cooling plate exhibited a tensile strength of 160 MPa, a yield strength of 58 MPa, and an elongation of 26%. After brazing, the potential of the second protective layer aluminum alloy was measured to be -890 mV, while the potential of the second core layer aluminum alloy was -720 mV. The potential of the second protective layer aluminum alloy was 170 mV lower than that of the second core layer aluminum alloy, meeting the requirement that the protective layer potential be at least 80 mV lower than that of the core layer. Corrosion testing using the new national standard coolant on the brazed liquid cooling plate also showed that it met the corrosion requirements.

[0064] Comparative Example 1 This comparative example prepares a liquid cooling plate, which differs from Example 1 in that the mass percentage of Zn in the first protective layer alloy and the second protective layer alloy is 0.7%, while the remaining components and specific preparation steps are the same and will not be described again here.

[0065] Mechanical property testing revealed that the post-weld liquid cooling plate had a tensile strength of 165 MPa, a yield strength of 65 MPa, and an elongation of 24%. After brazing, the potential of the second protective layer aluminum alloy was measured to be -765 mV, while the potential of the second core layer aluminum alloy was -690 mV. The protective layer potential was 75 mV lower than the core layer potential, failing to meet the requirement that the protective layer potential be at least 80 mV lower than the core layer potential. Corrosion testing was then conducted on the brazed liquid cooling plate using the new national standard coolant, and the corrosion resistance was not met.

[0066] Comparative Example 2 This comparative example prepares a liquid cooling plate, which differs from Example 1 in that: the thickness of the first protective layer aluminum alloy in the first composite plate of the liquid cooling plate accounts for 5% of the total thickness, and the thickness of the second protective layer aluminum alloy in the second composite plate accounts for 5% of the total thickness. The remaining components and specific preparation steps are the same and will not be described in detail here.

[0067] Mechanical property testing revealed that the post-weld liquid cooling plate exhibited a tensile strength of 165 MPa, a yield strength of 65 MPa, and an elongation of 24%. After brazing, the potential of the second protective layer aluminum alloy was measured to be -810 mV, while the potential of the second core layer aluminum alloy was -690 mV. The protective layer potential was 120 mV lower than the core layer potential, meeting the requirement that the protective layer potential be at least 80 mV lower than the core layer potential. However, the protective layer composite ratio was low, and the protective layer thickness was thin. Corrosion testing of the brazed liquid cooling plate using the new national standard coolant failed to meet the corrosion requirements.

[0068] Comparative Example 3 This comparative example prepares a liquid cooling plate, which differs from Example 1 in that the stacking order of the second composite layer alloy is different. The stacking order is: brazing layer aluminum alloy, second core layer alloy, and second protective layer alloy (i.e., the positions of the second protective layer alloy and the second core layer alloy are interchanged). The remaining components and specific preparation steps are the same and will not be described again here.

[0069] Mechanical property testing revealed that the welded liquid cooling plate had a tensile strength of 165 MPa, a yield strength of 65 MPa, and an elongation of 24%. Since the contact area between the second composite plate and the coolant lacked a protective layer, the brazed liquid cooling plate underwent corrosion testing using coolant conforming to the new national standard (GB 29743.2-2025), and the corrosion requirements were not met.

[0070] Obviously, the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A liquid-cooled plate, characterized in that, include: The first composite plate includes a composite first core material layer of aluminum alloy and a first protective layer of aluminum alloy; as well as The second composite plate, with grooves, comprises sequentially composited brazing layer aluminum alloy, second protective layer aluminum alloy, and second core layer aluminum alloy. The first protective layer aluminum alloy and the brazing layer aluminum alloy are welded together, so that the groove forms a flow channel.

2. The liquid cooling plate according to claim 1, characterized in that, The first protective layer aluminum alloy and the second protective layer aluminum alloy comprise the following components by mass percentage: Si≤1%, Fe≤0.7%, Cu≤0.2%, Mn0.2~2.0%, Zn0.8~5.0%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities.

3. The liquid cooling plate according to claim 1, characterized in that, The first core layer aluminum alloy and the second core layer aluminum alloy comprise the following components by mass percentage: Si 0.1~1%, Fe≤0.7%, Cu 0.25~1.1%, Mn 1.0~2.0%, Zn≤0.1%, Ti≤0.3%, with the remainder being Al and less than 0.15% unavoidable impurities.

4. The liquid cooling plate according to claim 1, characterized in that, The brazing layer aluminum alloy is an Al-Si alloy comprising 5.0 to 11.0% Si by mass.

5. The liquid cooling plate according to claim 1, characterized in that, The first protective layer aluminum alloy accounts for 7.5-25% of the total thickness of the first composite plate, the brazing layer aluminum alloy accounts for 5-15% of the total thickness of the second composite plate, and the second protective layer aluminum alloy accounts for 7.5-25% of the total thickness of the second composite plate.

6. A method for manufacturing the liquid-cooled plate according to any one of claims 1 to 5, characterized in that, include: The alloys are respectively formulated according to the set composition ratio, and then processed by melting and casting, milling, heating, hot rolling and cold rolling to produce the first composite preform plate and the second composite preform plate; The first composite preform and the second composite preform are annealed respectively, wherein the annealing temperature of the first composite preform and the second composite preform is 200~420℃ and the annealing holding time is 2~4h respectively; The first composite preform is cut to obtain the first composite plate; The second composite preform is sheared and pressed to obtain a second composite plate with the groove. as well as The first composite plate and the second composite plate are welded together to form the liquid cooling plate.

7. The method according to claim 6, characterized in that, In the heating step, the core material layer ingot used to roll the second composite preform is homogenized in a heating furnace at 600±20℃ for 10~24h.

8. The method according to claim 6, characterized in that, The welding was performed in a CAB furnace at 605±15℃.

9. A battery, characterized in that, Includes the liquid cooling plate described in any one of claims 1 to 5.

10. A new energy vehicle, characterized in that, Includes the battery as described in claim 9.

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