A solar temperature-controlled backsheet based on shape-stabilized phase change material and its preparation method

Abstract

This invention provides a solar temperature-controlled backsheet based on a shaped phase change material and its preparation method, belonging to the field of solar panel manufacturing technology. The invention involves uniformly mixing paraffin powder and premixed epoxy resin at a mass ratio of (7-6):(3-4), followed by curing to prepare a waterproof coating film on the surface, thus obtaining a solar temperature-controlled backsheet based on a shaped phase change material. This invention uses epoxy resin directly cured with paraffin powder, resulting in a phase change composite material with excellent mechanical properties, facilitating its processing into complex configurations. Simultaneously, it effectively increases the proportion of phase change thermal storage material. The prepared waterproof coating film further prevents the loss of phase change thermal storage material inside the solar temperature-controlled backsheet. The solar temperature-controlled backsheet of this invention can directly or closely contact the solar cells, allowing for more direct and effective temperature control of the cells, improving cell efficiency and lifespan.

Description

Technical Field

[0001] This invention relates to the field of solar panel manufacturing technology, specifically to a solar temperature-controlled backsheet based on a shape-stabilized phase change material and its preparation method. Background Technology

[0002] A solar panel is a device that directly converts solar energy into electrical energy using solar cells. It mainly consists of solar cells, a backsheet, a glass cover, and EVA encapsulation material. The backsheet is a crucial component of the solar panel; located on the back of the solar cells, its main functions include blocking air and moisture, providing electrical insulation, and providing mechanical support. Common backsheet materials on the market include polyvinylidene fluoride (PVF), polyvinylidene fluoride (PVDF), fluorocarbon coating (CPC), polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), and polyolefin (PO). These materials can be manufactured into backsheets with different structures through processes such as composite methods, coating methods, or co-extrusion.

[0003] Solar panels are affected by solar radiation and ambient temperature during operation, causing their temperature to rise. Increased temperature of the solar cells reduces their photoelectric conversion efficiency, resulting in decreased output power and electricity generation. Data shows that for every 1°C increase in the surface operating temperature of the solar panel, the output power decreases by approximately 0.3% to 0.5%. Simultaneously, increased temperature accelerates the aging and degradation of the solar cells and backsheet, affecting their stability and reliability, and shortening their lifespan. Therefore, controlling the temperature of solar panels is crucial for improving their performance and lifespan. Traditional solar panels typically have low heat dissipation efficiency, failing to provide effective temperature control.

[0004] Currently, the main technologies for controlling the temperature of solar panels are as follows:

[0005] Water-cooling technology: This technology uses a water circulation system to remove heat from the surface of solar panels, thereby lowering their temperature. This effectively cools solar panels and improves their power generation efficiency. However, it requires large amounts of water and supporting infrastructure, increasing costs and maintenance complexity, making it difficult to implement in arid regions and areas with inadequate infrastructure.

[0006] Air cooling technology: This technology uses fans or natural wind to remove heat from the surface of solar panels, thereby lowering their temperature. This method provides a simple way to cool solar panels, reducing costs and water consumption. However, fans require additional electricity, and natural wind is unpredictable due to environmental factors, performing poorly in still or light wind conditions.

[0007] Heat pipe technology: This technology uses heat pipes to conduct heat from the surface of solar panels to heat sinks or other media, thereby reducing their temperature. This technology can efficiently cool solar panels, improving their power generation efficiency and lifespan. However, this technology requires additional equipment such as heat pipes and heat sinks, increasing weight and space requirements, and complicating the structure, installation, and maintenance.

[0008] In summary, current solar panel temperature control technologies have certain limitations and shortcomings, requiring further improvement and innovation. This invention provides a novel solar panel backsheet made of a high-strength, shape-stabilized phase change material with a large specific heat capacity. This material can absorb a large amount of heat when the solar cell temperature exceeds its phase change temperature, and then release the heat at night when temperatures are lower, thus achieving the goal of controlling the solar panel temperature. Simultaneously, this material meets the requirements for air and moisture isolation, as well as providing electrical insulation and mechanical support. Summary of the Invention

[0009] To address the problems of complex structure, high cost, and high maintenance requirements in current solar panel temperature control technologies, this invention provides a solar temperature control backsheet based on shaped phase change material and its preparation method. The shaped phase change material is used as a structural component to replace the traditional solar backsheet that is in direct contact with the solar cells. The solar temperature control backsheet is directly composed of high-strength cold storage material, which effectively improves the volume utilization rate of the temperature control material and significantly reduces the thermal resistance in the heat transfer process, thereby achieving low-cost, passive solar panel temperature control.

[0010] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0011] A method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material includes the following steps:

[0012] (1) Pre-cool the paraffin to below -80 ℃ and then grind it into powder in an environment below 25 ℃; Before grinding the paraffin, it is necessary to pre-cool the paraffin to below -80 ℃ to avoid the paraffin melting due to heat during the grinding process;

[0013] (2) Premix epoxy resin with curing agent to obtain premixed epoxy resin; mix paraffin powder and premixed epoxy resin evenly at a mass ratio of (7~6):(3~4), and cure to obtain molded phase change material;

[0014] (3) The surface of the shaped phase change material is rinsed with plasma flow, and then a waterproof coating film is prepared on the surface of the shaped phase change material to obtain a solar temperature control backsheet based on the shaped phase change material.

[0015] This invention involves uniformly mixing paraffin powder and premixed epoxy resin at a mass ratio of (7~6):(3~4), and then curing the mixture to prepare a waterproof coating film on its surface. The resulting solar temperature control backsheet based on shaped phase change material has good mechanical properties and leak-proof performance. At the same time, the high proportion of phase change material in the solar temperature control backsheet of this invention enables more effective temperature control of solar cells, thereby improving the working efficiency and service life of the cells.

[0016] Furthermore, the curing process is carried out on the back of the solar cell. After rinsing and preparing a waterproof coating film, a solar temperature control backsheet based on a shaped phase change material is obtained. Alternatively, it can be cured separately, rinsed, and after preparing a waterproof coating film, it can be attached to the back of the solar cell with an adhesive material to obtain a solar temperature control backsheet based on a shaped phase change material.

[0017] Furthermore, the paraffin wax has a phase change temperature of 30 ℃ and a latent heat of phase change of over 200 J / g. This invention uses paraffin wax with a phase change temperature of 30 ℃ as a raw material, and prepares a solar temperature-controlled backsheet based on a shaped phase change material by mixing and curing it with epoxy resin. This solar temperature-controlled backsheet can control the temperature of the solar panel within a high-performance temperature range of 25 ℃ to 35 ℃. Simultaneously, the 30 ℃ phase change temperature ensures that the solar temperature-controlled backsheet can release heat at night. When the temperature of the solar cell exceeds 30 ℃, the paraffin wax changes from a solid to a liquid state, absorbing the heat generated by the solar cell and effectively preventing further temperature increases, thereby achieving effective temperature control of the solar panel.

[0018] Furthermore, the mass ratio of the paraffin powder to the premixed epoxy resin is 7:3.

[0019] Furthermore, the epoxy resin includes bisphenol F type epoxy resin.

[0020] Furthermore, the curing agent includes phenolic amine curing agents.

[0021] Furthermore, the mass ratio of the epoxy resin to the curing agent is (1.5~3):1.

[0022] Furthermore, the mass ratio of the epoxy resin to the curing agent is 2.5:1.

[0023] Furthermore, the grinding method is mortar and pestle cold grinding; the present invention uses mortar and pestle cold grinding to grind solidified paraffin wax under fixed pressure and grinding time, and controls the particle size of paraffin wax particles to the micron level by adjusting the grinding pressure and time, and ensures that the particle size of paraffin wax particles obtained from different batches of grinding is highly consistent.

[0024] Furthermore, the premixed epoxy resin and paraffin powder are mixed in a vacuum planetary gravity mixer. The mixing process is divided into three stages: the first stage, with a rotation speed of 600 rpm and a time of 1 minute; the second stage, with a rotation speed of 900 rpm and a time of 5 minutes; and the third stage, with a rotation speed of 600 rpm and a time of 1 minute. The three-stage mixing ensures that the small-particle-size paraffin powder and the high-viscosity epoxy resin are fully mixed, while avoiding the introduction of air bubbles.

[0025] Furthermore, the curing temperature is 5 °C; the present invention cures the mixture at a lower temperature to avoid the melting of the paraffin powder caused by the exothermic curing process.

[0026] Furthermore, the preparation of the waterproof coating film is carried out as follows: A UV-curable adhesive is evenly applied to the surface of the molded phase change material using a roller or spraying tool to achieve a suitable thickness. The coated portion is then placed under a UV lamp, where it typically cures rapidly into a film within a few seconds to tens of seconds. The main component of the UV-curable adhesive is epoxy acrylate, which undergoes cationic polymerization under UV irradiation to form a highly cross-linked three-dimensional network structure. This structure significantly reduces intermolecular gaps, effectively hindering the penetration of phase change materials, water molecules, and other impurities. This invention employs plasma flow treatment on the surface of the molded phase change material, which not only improves adhesion but also introduces oxygen-containing groups (e.g., C=O, -OH, and -COOH). The epoxy groups and oxygen-containing groups on the epoxy resin surface form chemical bonds with the active monomers in the UV-curable adhesive, strengthening interfacial bonding and further reducing the waterproof and moisture-proof performance and leakage rate of the solar temperature control backsheet.

[0027] Furthermore, the shape of the solar temperature control backplate based on the shape-stabilized phase change material is controlled by a mold.

[0028] Furthermore, the solar temperature control backplate based on shape-stabilized phase change material has a finned structure, with the sides of the fins perpendicular to the horizontal plane. The finned structure of the solar temperature control backplate enhances natural convection heat transfer while also increasing its strength.

[0029] The present invention also provides a solar temperature control backsheet based on a shape-stabilized phase change material prepared by the method described above.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] 1. The solar temperature control backplate provided by the present invention is directly constructed from high-strength shaped phase change material, which has mold forming characteristics similar to concrete; after the shaped phase change material is cured, a waterproof coating film is prepared on its surface by ultraviolet light curing adhesive. The coating is extremely thin and has good anti-leakage performance.

[0032] 2. The solar temperature control backsheet provided by the present invention can be cured on the back of the solar cell without adding unnecessary structure to the solar cell and without requiring complex structural modifications to the solar cell power generation system.

[0033] 3. This invention uses premixed epoxy resin to encapsulate paraffin powder for curing and molding. The resulting phase change composite material has excellent mechanical properties, which is beneficial for processing it into complex configurations. By coating the surface of the molded phase change material with a waterproof coating film, its waterproof and moisture-proof performance is further enhanced. The solar temperature control backsheet of this invention is in direct or close contact with the solar cells, which can more directly and effectively control the temperature of the solar cells, thereby improving the working efficiency and service life of the solar cells.

[0034] 4. This invention achieves temperature control of solar panels by significantly increasing the heat capacity of the backsheet material, eliminating the need for regular maintenance and reducing costs. Furthermore, the raw materials involved in this invention, such as paraffin wax and epoxy resin, have low procurement costs, which greatly reduces the cost of temperature control for solar panels. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a solar temperature control backsheet based on shape-controlled phase change materials.

[0036] Figure 2 These are stress-strain curves for different paraffin contents in a shaped phase change material.

[0037] Figure 3 These are the leakage rate test results of the shaped phase change material and the solar temperature control backsheet of this invention;

[0038] Figure 4 These are the leakage rate test results for backsheets prepared with different waterproof coating films;

[0039] Figure 5 These are the leakage rate test results for backplates made of different phase change materials;

[0040] Figure 6 The images show a comparison of physical photos of a traditional backplate and the solar-powered temperature-controlled backplate of this invention.

[0041] Figure 7 This is a comparison of the operating temperature and output power of a traditional backplate and the solar temperature-controlled backplate of this invention.

[0042] Figure 8 This is a schematic diagram of the finned solar temperature control backplate in this invention. Detailed Implementation

[0043] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This invention provides a method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material, comprising the following steps:

[0045] (1) Pre-cool the paraffin to below -80 ℃ and then grind it into powder in an environment below 25 ℃; Before grinding the paraffin, it is necessary to pre-cool the paraffin to below -80 ℃ to avoid the paraffin melting due to heat during the grinding process;

[0046] (2) Premix epoxy resin and curing agent at a mass ratio of (1.5~3):1 to obtain premixed epoxy resin; mix paraffin powder and premixed epoxy resin at a mass ratio of (7~6):(3~4) evenly, and cure to obtain molded phase change material;

[0047] (3) The surface of the shaped phase change material is rinsed with plasma flow, and then a waterproof coating film is prepared on the surface of the shaped phase change material to obtain a solar temperature control backsheet based on the shaped phase change material. A schematic diagram of the structure of the solar temperature control backsheet based on the shaped phase change material is shown below. Figure 1 As shown.

[0048] In some examples, the curing process is carried out on the surface of the solar cell, and after rinsing and preparing a waterproof coating film, a solar temperature control backsheet based on a shaped phase change material is obtained. Alternatively, it is cured separately, rinsed, and after preparing a waterproof coating film, it is attached to the back of the solar cell by an adhesive material to obtain a solar temperature control backsheet based on a shaped phase change material.

[0049] Example 1

[0050] A solar temperature-controlled backsheet based on a shape-stabilized phase change material is prepared using the following steps:

[0051] The first step is to prepare paraffin powder. In this embodiment, paraffin with a phase change temperature of 30 ℃ is selected as the phase change material. First, the paraffin is frozen to below -80 ℃, while ensuring that the ambient temperature for grinding is below 25 ℃. The amount of paraffin used is determined according to the size of the grinding instrument; in this embodiment, the volume of the mortar is approximately 700 mL, and 80 g of paraffin is added each time; the pressure of the pestle is set to the maximum, and the grinding time is 1 minute; the paraffin powder is then frozen at -80 ℃ for later use.

[0052] The second step is to prepare the premixed epoxy resin. The epoxy resin is bisphenol F type epoxy resin (Nanya 170 bisphenol F type epoxy resin), and the curing agent is a phenolic amine curing agent (593 phenolic amine curing agent). First, the epoxy resin and curing agent are placed in a vacuum planetary gravity mixer for premixing. The mixer speed is set to 900 RPM for 1 minute to obtain the premixed epoxy resin, which is then removed and stored at -20 ℃ for later use.

[0053] The third step involves mixing the paraffin powder stored at -80 ℃ with the premixed epoxy resin in a vacuum planetary gravity mixer to obtain a mixture. The mixing is carried out in three stages: the first stage is at a speed of 600 PRM for 1 minute; the second stage is at a speed of 900 PRM for 5 minutes; and the third stage is at a speed of 600 PRM for 1 minute. The mixture is then transferred to a mold, which in this embodiment is a 100 mm x 100 mm x 10 mm cuboid. The mixture is cured at 5 ℃ for one day to obtain the shaped phase change materials S1~S6. The details of the raw material mass ratio of S1~S6 are shown in Table 1.

[0054] Table 1: Raw material mass ratio of S1 to S6

[0055]

[0056] Figure 2 The stress-strain curves of phase change materials S3 (α=70%), S5 (α=60%), and S6 (α=80%) are shown. It can be seen from the figure that compared with the material with 0% paraffin (cured by epoxy resin and curing agent at a mass ratio of 2.5:1), the maximum stress value of the phase change material with paraffin is significantly reduced. Under the premise that the stress value meets the standard, the preferred mass ratio of paraffin powder to premixed epoxy resin in this invention is 7:3.

[0057] The fourth step is to activate the surface of the shaped phase change material. The surface of the shaped phase change material S3 is rinsed in a vacuum environment for 1 minute using an oxygen molecular plasma stream to improve coating adhesion. A UV-curable adhesive (D-5604 UV-curable adhesive) and an insulating conformal coating are then evenly applied to the surface of the shaped phase change material S3 using a spraying tool, with a suitable thickness. The adhesive-coated portion is then placed under a UV lamp to form a film, resulting in solar temperature control backsheets S7 (coated with UV-curable adhesive) and S8 (coated with insulating conformal coating) based on the shaped phase change material (paraffin).

[0058] Comparative Example 1

[0059] Epoxy resin and curing agent were premixed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1. The mixer speed was set to 900 RPM for 1 minute to obtain premixed epoxy resin. Liquid paraffin with a phase change temperature of 30 ℃ was mixed with the premixed epoxy resin in a vacuum planetary gravity mixer at a mass ratio of 7:3 to obtain a mixture. The mixing was carried out in three stages: the first stage was at a speed of 600 RPM for 1 minute; the second stage was at a speed of 900 RPM for 5 minutes; and the third stage was at a speed of 600 RPM for 1 minute. The mixture was transferred to a mold, which in this embodiment was a 100 mm x 100 mm x 10 mm cuboid. It was cured at 5 ℃ for one day, but failed to cure completely.

[0060] Comparative Example 2

[0061] The inorganic phase change material hydrated salt was used to replace the paraffin in Example 1. The preparation steps are as follows: The hydrated salt (sodium sulfate decahydrate) was frozen to below -80 ℃ to ensure that the ambient temperature for grinding was below 25 ℃. The amount of hydrated salt was determined according to the size of the grinding instrument; in this example, the volume of the mortar was approximately 700 mL, and 80 g of hydrated salt was added each time; the pressure of the pestle was set to the maximum, and the grinding time was 1 minute; the hydrated salt powder was frozen at -80 ℃ for later use.

[0062] Epoxy resin and curing agent were placed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1 for premixing. The mixer speed was set to 900 RPM and the time was 1 minute to obtain premixed epoxy resin. The premixed epoxy resin was then removed and stored at -20 ℃ for later use.

[0063] Hydrated salt powder stored at -80 °C was mixed with premixed epoxy resin in a vacuum planetary gravity mixer at a mass ratio of 7:3 to obtain a mixture. The mixing was carried out in three stages: the first stage was at a speed of 600 rpm for 1 minute; the second stage was at a speed of 900 rpm for 5 minutes; and the third stage was at a speed of 600 rpm for 1 minute. The mixture was then transferred to a mold, which in this embodiment was a 100 mm x 100 mm x 10 mm cuboid. The mixture was cured at 5 °C for one day to obtain hydrated salt molded phase change material S9.

[0064] The surface of the hydrated salt-formed phase change material S9 was rinsed with oxygen molecular plasma in a vacuum environment for 1 minute to improve the coating adhesion. The photocurable adhesive was evenly applied to the surface of the hydrated salt-formed phase change material S9 with a moderate thickness using a spraying tool. The part with the adhesive was placed under a UV lamp to form a film, thus obtaining the solar temperature control backsheet S10 based on the shaped phase change material (hydrated salt).

[0065] Molded paraffin phase change materials S1~S6, molded hydrated salt phase change material S9, and molded back plates S7, S8, and S10 were placed in a drying oven at 50 ℃ and continuously heated. Their mass was measured again. The ratio of the decrease in mass to the original mass is the leakage rate. The test results are as follows: Figures 3 to 5 As shown. By Figure 3 It can be seen that after continuous heating for 450 h, the leakage rate was lowest when the mass ratio of epoxy resin to curing agent was 2.5:1; the leakage rate was also lowest when the mass ratio of paraffin powder to premixed epoxy resin was 7:3; after preparing a waterproof coating film on the surface of the molded phase change material, the leakage resistance of the backing plate was further enhanced (after continuous heating for 450 h, the leakage rate of S7 remained below 5%). Figure 4 It can be seen that the present invention uses a light-curing adhesive as a waterproof coating film, and its leak-proof effect is superior to that of a conformal coating film; Figure 5 It can be seen that using paraffin as a phase change material provides superior leak-proof performance compared to hydrated salts. These results demonstrate that the solar temperature-controlled backsheet prepared by using a specific phase change material and premixed epoxy resin in a certain proportion, followed by coating treatment, exhibits excellent leak-proof performance.

[0066] The curing process in Example 1 is carried out directly on the back of the solar cell. After rinsing and preparing a waterproof coating film, a solar temperature-controlled backsheet based on a shape-stabilized phase change material is obtained. Under a standard solar radiation intensity, the traditional backsheet and the solar temperature-controlled backsheet of the present invention are compared (see physical image). Figure 6 The operating temperature and power generation of the device were measured. The experimental results are shown in [link to experimental results]. Figure 7 The results showed that, compared with the cooling system of a traditional backsheet, the solar temperature-controlled backsheet of the present invention reduced the heating rate by 21.5% and increased power generation by 5% within 4000 s. This result indicates that the solar temperature-controlled backsheet of the present invention can directly or closely contact the solar cells, enabling more direct and effective control of the cell temperature, thereby improving cell efficiency and lifespan.

[0067] Example 2

[0068] A topology optimization design for a solar thermal control backsheet structure based on shape-stabilized phase change materials is presented, and the fabrication steps are as follows:

[0069] The first step is to prepare paraffin powder. In this embodiment, paraffin is selected as the phase change material. First, the paraffin is frozen to below -80°C, while ensuring that the ambient temperature for grinding is below 25°C. The amount of paraffin used is determined according to the size of the grinding instrument; in this embodiment, the volume of the mortar is approximately 700 mL, and 80 g of paraffin is added each time; the mortar pressure and grinding time are set, and the particle size distribution of the resulting paraffin powder is shown in the figure; the paraffin powder is then frozen at -80°C for later use.

[0070] The second step is to prepare the premixed epoxy resin. The epoxy resin is bisphenol F type epoxy resin (Nanya 170 bisphenol F type epoxy resin), and the curing agent is a phenolic amine curing agent (593 phenolic amine curing agent). First, the epoxy resin and curing agent are placed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1 for premixing. The mixer speed is set to 900 RPM for 1 minute to obtain the premixed epoxy resin, which is then removed and stored at -20 ℃ for later use.

[0071] The third step involves mixing paraffin powder stored at -80 ℃ with premixed epoxy resin in a vacuum planetary gravity mixer at a mass ratio of 7:3. The mixing process is divided into three stages: the first stage is at a speed of 600 rpm for 1 minute; the second stage is at a speed of 900 rpm for 5 minutes; and the third stage is at a speed of 600 rpm for 1 minute. The mixture is then transferred to a mold, which in this embodiment is a finned mold. The mixture is cured in a refrigerator environment (ambient temperature 5 ℃) for one day to obtain the shaped phase change material.

[0072] The fourth step is to activate the surface of the shaped phase change material. The surface of the shaped phase change material is rinsed for 1 minute in a vacuum environment using an oxygen molecular plasma stream, thereby improving coating adhesion.

[0073] Step 5: Prepare the waterproof coating film. Apply a UV-curable adhesive (D-5604 UV-curable adhesive) evenly and to a suitable thickness to the surface of the shaped phase change material using a spraying tool. Place the coated portion under a UV lamp to form a film, thus obtaining a solar temperature control backsheet based on the shaped phase change material (see schematic diagram of the finned solar temperature control backsheet). Figure 8 This membrane has excellent waterproof and moisture-proof properties.

[0074] The solar-powered temperature-controlled backplate in this embodiment adopts a finned structure, with the sides of the fins perpendicular to the horizontal plane. Experimental results show that this arrangement of fins promotes heat dissipation by increasing the surface area, thereby improving the heat dissipation effect. The spacing between the fins plays a crucial role in this structure, ensuring proper airflow and maximizing heat dissipation efficiency.

[0075] The above detailed embodiments describe the implementation of the present invention; however, the present invention is not limited to the specific details described in the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material, characterized in that, Includes the following steps: (1) The paraffin wax is pre-cooled to below -80 ℃ and then ground into powder in an environment below 25 ℃; the phase change temperature of the paraffin wax is 30 ℃; (2) Premix epoxy resin with curing agent to obtain premixed epoxy resin; mix paraffin powder and premixed epoxy resin evenly at a mass ratio of (7~6):(3~4), and cure to obtain molded phase change material; the curing temperature is 5 ℃. (3) The surface of the shaped phase change material is rinsed with plasma flow, and then a waterproof coating film is prepared on the surface of the shaped phase change material to obtain a solar temperature control backsheet based on the shaped phase change material.

2. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The curing process is carried out on the back of the solar cell. After being washed by plasma flow and a waterproof coating film is prepared, a solar temperature control backsheet based on a shaped phase change material is obtained. Alternatively, it can be cured and shaped separately, rinsed with plasma flow, and a waterproof coating film can be prepared. Then, it can be attached to the back of the solar panel with an adhesive material to obtain a solar temperature control backsheet based on shape-stabilized phase change material.

3. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The epoxy resin includes bisphenol F type epoxy resin; the curing agent includes phenolic amine curing agents.

4. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The mass ratio of epoxy resin to curing agent is (1.5~3):

1.

5. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The grinding method is mortar-type cold grinding.

6. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The operation for preparing the waterproof coating film is as follows: apply the light-curing adhesive evenly to the surface of the shaped phase change material using a roller or spraying tool, and place the part coated with adhesive under a UV lamp to form a film.

7. The method for preparing a solar temperature-controlled backsheet based on a shape-stabilized phase change material according to claim 1, characterized in that, The solar temperature control backplate based on shape-fixed phase change material has a finned structure, and the side of the fin is perpendicular to the horizontal plane.

8. A solar temperature-controlled backsheet based on a shape-stabilized phase change material prepared by the method described in any one of claims 1 to 7.

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