CN-115548517-B - Graphene-based coating liquid cooling plate and preparation method thereof

Abstract

The invention relates to the technical field of liquid cooling plates, and particularly discloses a graphene coating-based liquid cooling plate which comprises an upper substrate, a lower substrate and a graphene coating, wherein a groove is formed in the upper substrate, a flow channel for circulating cooling liquid is formed between the upper substrate and the lower substrate through the groove, the flow channel is respectively connected with a liquid inlet and a liquid outlet, the graphene coating is arranged on one surface, far away from the upper substrate, of the lower substrate, the graphene coating is provided with concave unit microstructures which are arrayed, the upper substrate and the lower substrate are connected together through rolling, and the flow channel is formed through inflation molding. According to the graphene coating-based liquid cooling plate disclosed by the invention, the excellent heat conductivity of the graphene coating is utilized to conduct heat to the cooling liquid in the flow channel of the liquid cooling plate, the concave unit microstructure on the surface of the graphene coating can enlarge the heat exchange area to fully dissipate heat and transfer heat, so that the heat exchange efficiency is improved, and the heat dissipation effect of the liquid cooling plate is improved. The rolling connection-inflation molding is adopted, so that the sealing reliability and the integral formability of the liquid cooling plate are improved.

Inventors

• WU YANYAN
• Zhuo Nengcong
• YOU HUI
• Ruan Ruicheng
• Shi Xiangbiao
• Zan Yixin
• YANG RONG
• SHI CHENGYU

Assignees

• 广西大学

Dates

Publication Date

20260512

Application Date

20221031

Claims (5)

1. 1. The preparation method of the liquid cooling plate based on the graphene coating is characterized in that the liquid cooling plate comprises an upper substrate, a lower substrate and the graphene coating, wherein the lower substrate is a graphene reinforced aluminum substrate, the upper substrate is an aluminum plate, a groove is formed in the upper substrate, a flow channel for circulating cooling liquid is formed between the upper substrate and the lower substrate through the groove, the flow channel is respectively connected with a liquid inlet and a liquid outlet, the graphene coating is arranged on one surface, far away from the upper substrate, of the lower substrate, the graphene coating is provided with concave unit microstructures distributed in an array manner, the upper substrate and the lower substrate are connected together through rolling, and the flow channel is prepared through inflation molding; the preparation method comprises the following steps: (1) Preparing a graphene reinforced aluminum substrate, namely forming a tin film on the surface of graphene aerogel by adopting a vacuum evaporation method, stirring and crushing the graphene aerogel with the tin film formed on the surface to obtain graphene powder with the tin film formed on the surface; (2) Coarsening one surface of a graphene reinforced aluminum substrate, shielding a non-flow channel region, coating a graphene oil-based coating on the rough surface of the graphene reinforced aluminum substrate, and drying to form a graphene flow channel circuit diagram; (3) Covering one surface of the graphene reinforced aluminum substrate, which is obtained by the treatment in the step (2), with a graphene flow channel circuit diagram with a layer of aluminum plate, and carrying out hot rolling compounding and annealing treatment, wherein the hot rolling temperature is 400-450 ℃, and the annealing treatment is that the hot rolling treatment is carried out for 1-3 hours at the temperature of 400-450 ℃; (4) Forming a flow channel by adopting an inflation process; (5) Coarsening one surface of the graphene reinforced aluminum substrate, which is far away from the upper substrate, and coating a graphene coating; (6) And preparing concave unit microstructures distributed in an array manner on the graphene coating by adopting laser etching.
2. 2. The method for manufacturing a graphene-based coating liquid cooling plate according to claim 1, wherein the concave unit microstructure is cylindrical in shape.
3. 3. The preparation method of the graphene-based coating liquid cooling plate according to claim 1, wherein the diameter of the concave unit microstructures is 100-300 μm, the depth is 20-40 μm, and the interval between the concave unit microstructures is 100-300 μm.
4. 4. The preparation method of the liquid cooling plate based on the graphene coating, which is disclosed in claim 1, is characterized in that the graphene oil-based coating is obtained by mixing graphene powder and polydimethylsiloxane in a mass ratio of 1:8-15, and then adding an organic solvent for dilution by 3-8 times.
5. 5. The preparation method of the graphene-coating-based liquid cooling plate, which is disclosed in claim 1, is characterized in that the specific process of the step (5) comprises the steps of dispersing graphene oxide in water, wherein the ratio of the graphene oxide to the water is 1-15 mg/1 ml, adding r-aminopropyl triethoxysilane accounting for 30-50% of the weight of the graphene oxide, performing ultrasonic dispersion for 1-3 hours to obtain modified graphene oxide dispersion, coating the modified graphene oxide dispersion on the roughened surface of a graphene reinforced aluminum substrate, and performing heat treatment for 1-2 hours at 400-500 ℃ in the atmosphere of hydrogen and argon to obtain the graphene coating.

Description

Graphene-based coating liquid cooling plate and preparation method thereof Technical Field The invention belongs to the technical field of liquid cooling plates, and particularly relates to a graphene coating-based liquid cooling plate and a preparation method thereof. Background The power battery is an energy source of the new energy electric automobile, and the working efficiency of the power battery restricts the driving mileage and the driving speed of the electric automobile. The power battery has high working current and high heat production, is in a relatively closed environment, is difficult to dissipate heat, is easy to cause the temperature rise of the power battery, has high sensitivity to the temperature, is easy to cause poor consistency of a battery pack module and shortened service life when the temperature is too high, can be used for solving the problems that the thermal runaway of the battery is easy to cause by a motor and an electric control service life, and causes the explosion of the battery. The performance of the battery is safe and stable, the battery becomes an important factor influencing the future development of the new energy electric automobile, and the liquid cooling plate can effectively solve the problems of difficult heat dissipation and overhigh temperature of the power battery. The liquid cooling plate is used for rapidly cooling the battery pack by introducing cooling liquid into the liquid cooling plate flow channel and taking away a large amount of heat in a short time. The existing liquid cooling plate mainly has the defects that the volume of the tube plate type liquid cooling plate is large, the occupied space is large, the shape of a circular tube is more limited in the design of a battery pack, a tubular radiator is limited by a structure, the contact area of a pipeline and a heat exchange area is relatively small, so that the heat exchange efficiency is reduced, the heat exchange plate cannot adapt to the complex structural characteristics in the battery box, the wall thickness of the profile type liquid cooling plate is too large, the plate is heavier, the light weight cannot be achieved when the plate is applied to a battery system, the cost is high, the processing difficulty is high by adopting a process of first punching upper and lower plates and then brazing and welding, the overall tightness of the upper and lower liquid cooling plates is difficult to ensure under the condition that the shape of the liquid cooling plate is complex, the processing efficiency is low, the defective rate is high, the welding pollution is serious, the heat dissipation performance of the liquid cooling plate is poor, and the like. There is a need to develop a novel liquid cooling plate which is safe and environment-friendly and has excellent performance. Disclosure of Invention The invention aims to provide a liquid cooling plate based on a graphene coating and a preparation method thereof, which overcome the defects of the improvement of the background technology. The invention provides a graphene coating-based liquid cooling plate, which comprises an upper substrate, a lower substrate and a graphene coating, wherein a groove is formed in the upper substrate, a flow channel for circulating cooling liquid is formed between the upper substrate and the lower substrate through the groove, the flow channel is respectively connected with a liquid inlet and a liquid outlet, the graphene coating is arranged on one surface, far away from the upper substrate, of the lower substrate, the graphene coating is provided with concave unit microstructures which are arrayed, the upper substrate and the lower substrate are connected together through rolling, and the flow channel is manufactured through inflation molding. The graphene coating has excellent thermal conductivity, is favorable for conducting heat to cooling liquid, is provided with concave unit microstructures arranged in an array on the surface of the graphene coating, is favorable for enlarging the heat exchange area to fully dissipate heat and transfer heat, improves the heat exchange efficiency, and improves the heat dissipation effect of the liquid cooling plate. By adopting rolling and inflation molding, the sealing reliability of the liquid cooling plate is higher, and the integral formability is good. Preferably, in the graphene-based coating liquid cooling plate, the concave unit microstructure is cylindrical. Preferably, in the graphene-based coating liquid cooling plate, the diameter of the concave unit microstructure is 100-300 μm, the depth is 20-40 μm, and the interval between the concave unit microstructures is 100-300 μm. Preferably, in the graphene-based coating liquid cooling plate, the lower substrate is a graphene reinforced aluminum substrate, and the upper substrate is an aluminum plate. The lower substrate adopts graphene to strengthen the aluminum substrate, so that the strength and the heat conduction perfo