Solar temperature control backboard based on shape-stabilized phase change material and preparation method thereof

Abstract

The invention provides a solar temperature control backboard based on a shape-stabilized phase change material and a preparation method of the solar temperature control backboard, and belongs to the technical field of solar cell panel manufacturing. Paraffin powder and premixed epoxy resin are evenly mixed according to the mass ratio of (7-6): (3-4), a waterproof coating film is prepared on the surface of the mixture after curing, and the solar temperature control backboard based on the shape-stabilized phase change material is obtained. The epoxy resin and the paraffin powder are directly cured and formed, the formed phase-change composite material has excellent mechanical performance, the phase-change composite material can be processed into a complex structure easily, and meanwhile the proportion of the phase-change heat storage material is effectively increased; the prepared waterproof coating film can further prevent the phase change heat storage material in the solar temperature control backboard from losing. The solar temperature control backboard can be in direct or close contact with the battery piece, the temperature of the battery piece can be controlled more directly and effectively, the working efficiency of the battery piece is improved, and the service life of the battery piece is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of solar panel manufacturing, and in particular to a solar temperature control back panel based on a shaped phase change material and a preparation method thereof. Background Art

[0002] Solar panels are devices that use solar cells to directly convert sunlight into electrical energy. They are mainly composed of solar cells, backplanes, glass cover plates, EVA packaging materials, etc. The backplane is an important component of solar panels. It is located on the back of the solar cells. Its main functions include blocking air and water vapor, providing electrical insulation, and providing mechanical support. At present, common backplane materials on the market include polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), fluorocarbon coating (CPC), polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polyolefin (PO), etc. They can be made into backplanes of different structures through processes such as compounding, coating or co-extrusion.

[0003] When working, solar panels are affected by solar radiation and ambient temperature, causing their temperature to rise. The temperature increase of solar cells will reduce their photoelectric conversion efficiency, resulting in a decrease in the output power and power generation of solar panels. Relevant data show that for every 1°C increase in the surface operating temperature of the panel, the output power of the solar panel will decrease by about 0.3% to 0.5%. At the same time, the temperature increase will also accelerate the aging and degradation of solar cells and backplanes, affecting their stability and reliability and shortening their service life. Therefore, controlling the temperature of solar panels is an important means to improve their performance and life. Traditional solar panels usually have low heat dissipation efficiency and cannot provide a beneficial effect on solar panel temperature control.

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

[0005] Water cooling technology: Use a water circulation system to remove heat from the surface of solar panels, thereby reducing their temperature. This technology can effectively cool solar panels and improve their power generation efficiency. However, this technology requires a large amount of water resources and supporting facilities, which increases costs and maintenance difficulties, and is difficult to implement in arid areas and areas with incomplete infrastructure.

[0006] Air cooling technology: Use fans or natural wind to remove heat from the surface of solar panels, thereby reducing their temperature. This technology can simply achieve cooling of solar panels, reducing costs and water consumption. However, fans consume additional electricity, and natural wind is unstable due to environmental factors, and is not effective in the absence of wind or light wind.

[0007] Heat pipe technology: Heat pipes are used to transfer heat from the surface of solar panels to radiators or other media, thereby reducing their temperature. This technology can efficiently cool solar panels and improve their power generation efficiency and lifespan. However, this technology requires the addition of additional equipment such as heat pipes and radiators, which increases weight and space occupancy, and complicates structure, installation, and maintenance.

[0008] In summary, the current solar panel temperature control technology has certain limitations and deficiencies, and further improvements and innovations are needed. The present invention provides a new type of solar cell backplane, which is composed of high-strength shaped phase change material and has a large specific heat capacity. It can absorb a large amount of heat from the solar cell when the temperature exceeds its phase change temperature, and then release the heat when the temperature is lower at night, thereby achieving the goal of controlling the temperature of the solar cell panel. At the same time, this material meets the requirements of isolating the backplane from air and water vapor, and providing electrical insulation and mechanical support. Summary of the invention

[0009] In view of the problems of complex structure, high cost and high maintenance requirements of current solar panel temperature control technology, the present invention provides a solar temperature control backboard based on a fixed phase change material and a preparation method thereof. The fixed phase change material is used as a structural component to replace the direct contact between the traditional solar backboard and the battery cell. The solar temperature control backboard 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 realizing low-cost, passive solar panel temperature control.

[0010] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0011] A method for preparing a solar temperature control backplane based on a shaped phase change material comprises the following steps:

[0012] (1) Precool the paraffin to below -80 °C, and then grind it into powder at a temperature below 25 °C. Before grinding the paraffin, it is necessary to precool the paraffin to below -80 °C to prevent the paraffin from melting during the grinding process.

[0013] (2) premixing the epoxy resin and the curing agent to obtain a premixed epoxy resin; uniformly mixing the paraffin powder and the premixed epoxy resin in a mass ratio of (7-6): (3-4), and curing to obtain a formed phase change material;

[0014] (3) The surface of the formed phase change material is washed by plasma jet, and then a waterproof coating film is prepared on the surface of the formed phase change material to obtain a solar temperature control backplane based on the shaped phase change material.

[0015] The present invention prepares a waterproof coating film on the surface of paraffin powder and premixed epoxy resin in a mass ratio of (7-6): (3-4) by uniform mixing, and after curing, preparing a waterproof coating film on the surface. The prepared solar temperature control backboard based on the fixed phase change material has good mechanical properties and anti-leakage properties; at the same time, the solar temperature control backboard of the present invention has a high proportion of phase change material, which can more effectively control the temperature of solar cell sheets, 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, and after washing and preparing a waterproof coating film, a solar temperature control backboard based on a shaped phase change material is obtained. Alternatively, the solar temperature control backboard based on a shaped phase change material is obtained by curing and forming alone, and after washing and preparing a waterproof coating film, it is attached to the back of the solar cell panel with an adhesive material to obtain a solar temperature control backboard based on a shaped phase change material.

[0017] Furthermore, the phase change temperature of the paraffin is 30°C, and the latent heat of the phase change is above 200 J / g; the present invention adopts paraffin with a phase change temperature of 30°C as a raw material, and prepares a solar temperature control backboard based on a fixed phase change material by mixing and curing with an epoxy resin. The solar temperature control backboard can control the temperature of the solar cell panel within a high-performance temperature range of 25°C to 35°C. At the same time, the phase change temperature of 30°C can ensure that the solar temperature control backboard can release heat at night; when the temperature of the solar cell exceeds 30°C, the paraffin changes from a solid state to a liquid state, absorbs the heat generated by the solar cell, and effectively prevents the temperature of the cell from further increasing, thereby achieving effective control of the temperature of the solar cell 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 epoxy resin.

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

[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 cold grinding; the present invention adopts the mortar cold grinding method to grind the solidified paraffin under fixed pressure and grinding time, and controls the particle size of the paraffin particles to the micron level by adjusting the grinding pressure and time, and ensures that the particle size consistency of the paraffin particles obtained by grinding different batches is high.

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

[0025] Furthermore, the curing temperature is 5° C. The present invention cures the mixture at a relatively low temperature in order to avoid melting of the paraffin powder caused by heat release during the curing process.

[0026] Furthermore, the operation of preparing the waterproof coating film is as follows: the photocuring glue is evenly applied to the surface of the formed phase change material by a roller or a spraying tool with a moderate thickness, and the part coated with the glue is placed under an ultraviolet light lamp, which can be quickly cured into a film in just a few seconds to tens of seconds. The main component of the photocuring glue is epoxy acrylate, which undergoes cationic polymerization under ultraviolet irradiation to form a highly cross-linked three-dimensional network structure. This structure greatly reduces the molecular gap and can effectively hinder the penetration of phase change materials, water molecules and other impurities; the present invention uses plasma flow to treat the surface of the formed phase change material, which can not only improve the adhesion, but also introduce oxygen-containing groups (such as C=O, -OH and -COOH). The epoxy group and oxygen-containing group on the surface of the epoxy resin form chemical bonds with the active monomers in the photocuring glue, which can strengthen the interface bonding and further reduce the waterproof and moisture-proof performance and leakage rate of the solar temperature control backplane.

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

[0028] Furthermore, the solar temperature control backboard based on the shaped phase change material is a fin structure, and the side of the fin is perpendicular to the horizontal plane. The solar temperature control backboard with the fin structure can enhance the natural convection heat transfer while increasing the strength.

[0029] The present invention also provides a solar temperature control back plate based on a shaped phase change material prepared by the method.

[0030] Compared with the prior art, the present invention is beneficial in that:

[0031] 1. The solar temperature control backplane provided by the present invention is directly constructed of high-strength shaped phase change material and has a mold forming feature 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, and the coating is extremely thin and has good anti-leakage performance.

[0032] 2. The curing process of the solar temperature control backplane provided by the present invention can be carried out on the back of the solar cell, without adding redundant structure to the solar cell panel and without complicated structural modification of the solar cell power generation system.

[0033] 3. The present invention uses premixed epoxy resin to wrap paraffin powder for solidification and forming. The formed phase change composite material has excellent mechanical properties, which is conducive to processing it into a complex configuration; by coating a waterproof coating film on the surface of the formed phase change material, its waterproof and moisture-proof properties are further increased; the solar temperature control backplane of the present invention is in direct or close contact with the battery cell, which can more directly and effectively control the temperature of the battery cell, thereby improving the working efficiency and service life of the battery cell.

[0034] 4. The present invention realizes temperature control of solar panels by greatly improving the heat capacity of the backplane material, which does not require regular maintenance and has lower costs. In addition, the raw materials involved in the present invention, such as paraffin and epoxy resin, have low procurement costs, which greatly reduces the cost of temperature control of solar panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of a solar temperature control backplane based on a shaped phase change material;

[0036] Figure 2 It is the stress-strain curve under different wax proportions in the formed phase change material;

[0037] Figure 3 It is the leakage rate test result of the formed phase change material and the solar temperature control back plate of the present invention;

[0038] Figure 4 It is the leakage rate test result of the backsheet prepared with different waterproof coating membranes;

[0039] Figure 5 It is the leakage rate test result of the backplane made of different phase change materials;

[0040] Figure 6 It is a physical comparison of the traditional back sheet and the solar temperature control back sheet of the present invention;

[0041] Figure 7 The comparison of the working temperature and output power of the conventional backsheet and the solar temperature control backsheet of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the solar temperature control back plate with a fin structure in the present invention. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The present invention provides a method for preparing a solar temperature control backplane based on a shaped phase change material, comprising the following steps:

[0045] (1) Precool the paraffin to below -80 °C, and then grind it into powder at a temperature below 25 °C. Before grinding the paraffin, it is necessary to precool the paraffin to below -80 °C to prevent the paraffin from melting during the grinding process.

[0046] (2) premixing the epoxy resin and the curing agent in a mass ratio of (1.5-3):1 to obtain a premixed epoxy resin; uniformly mixing the paraffin powder and the premixed epoxy resin in a mass ratio of (7-6):(3-4), and curing to obtain a formed phase change material;

[0047] (3) The surface of the formed phase change material is washed with a plasma jet, and then a waterproof coating film is prepared on the surface of the formed phase change material to obtain a solar temperature control backplane based on the shaped phase change material. The structural schematic diagram of the solar temperature control backplane based on the shaped phase change material is shown in FIG. Figure 1 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 backboard based on a shaped phase change material is obtained. Alternatively, it is cured and formed separately, and after rinsing and preparing a waterproof coating film, it is attached to the back of the solar cell with an adhesive material to obtain a solar temperature control backboard based on a shaped phase change material.

[0049] Example 1

[0050] A solar temperature control backplane based on a shaped phase change material, the preparation steps are as follows:

[0051] The first step is to prepare paraffin powder. In this embodiment, paraffin with a phase change temperature of 30°C is selected as the phase change material. First, freeze the paraffin to below -80°C, and ensure that the ambient temperature of grinding is below 25°C. Determine the amount of paraffin according to the size of the grinding instrument; in this embodiment, the volume of the mortar is about 700 mL, and 80 g of paraffin is added each time; set the pestle pressure to the maximum and the grinding time to 1 minute; freeze the paraffin powder in an environment of -80°C for later use.

[0052] The second step is to prepare premixed epoxy resin. The epoxy resin is bisphenol F epoxy resin (Nan Ya 170 bisphenol F epoxy resin), and the curing agent is phenol amine curing agent (593 phenol amine curing agent); first, the epoxy resin and curing agent are placed in a vacuum planetary gravity mixer for premixing, and the speed of the mixer is set to 900 RPM for 1 minute to obtain the premixed epoxy resin, which is taken out and stored at -20 °C for later use.

[0053] In the third step, the paraffin powder stored at -80 ° C and the premixed epoxy resin are placed in a vacuum planetary gravity mixer to mix to obtain a mixture, and the mixing is carried out in three stages: in the first stage, the rotation speed is 600 PRM and the time is 1 minute; in the second stage, the rotation speed is 900 PRM and the time is 5 minutes; in the third stage, the rotation speed is 600 PRM and the time is 1 minute; the mixture is transferred to a mold, and in this embodiment, the interior of the mold is a rectangular parallelepiped of 100 mm x 100 mm x 10 mm; and the formed phase change materials S1~S6 are obtained by curing at 5 ° C for one day. The mass ratio of the raw materials of S1~S6 is shown in Table 1.

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

[0055]

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

[0057] The fourth step is to activate the surface of the formed phase change material. The surface of the formed phase change material S3 is washed with oxygen molecular plasma flow in a vacuum environment for 1 minute to improve the adhesion of the coating; the light-curing glue (D-5604 ultraviolet curing glue) and the insulating three-proof paint are evenly applied on the surface of the formed phase change material S3 by spraying tools with moderate thickness, and the part coated with glue is placed under ultraviolet light to form a film, thus obtaining the solar temperature control backplane S7 (coating is light-curing glue) and S8 (coating is insulating three-proof paint) based on the fixed phase change material (paraffin).

[0058] Comparative Example 1

[0059] The epoxy resin and the curing agent were pre-mixed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1, and the speed of the mixer was set to 900 RPM for 1 minute to obtain a premixed epoxy resin; liquid paraffin with a phase change temperature of 30°C and the premixed epoxy resin were mixed in a vacuum planetary gravity mixer at a mass ratio of 7:3 to obtain a mixture, and the mixing was carried out in three stages: in the first stage, the speed was 600 PRM for 1 minute; in the second stage, the speed was 900 PRM for 5 minutes; in the third stage, the speed was 600 PRM for 1 minute; the mixture was transferred to a mold, and in this embodiment, the interior of the mold was a rectangular parallelepiped of 100 mm x 100 mm x 10 mm; it was cured at 5°C for one day, but failed to be cured.

[0060] Comparative Example 2

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

[0062] The epoxy resin and the curing agent were pre-mixed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1. The speed of the mixer was set to 900 RPM for 1 minute to obtain a pre-mixed epoxy resin, which was taken out and stored at -20°C for later use.

[0063] The hydrated salt powder stored at -80°C and the premixed epoxy resin are placed in a vacuum planetary gravity mixer at a mass ratio of 7:3 to obtain a mixture, and the mixing is carried out in three stages: in the first stage, the rotation speed is 600 PRM and the time is 1 minute; in the second stage, the rotation speed is 900 PRM and the time is 5 minutes; in the third stage, the rotation speed is 600 PRM and the time is 1 minute; the mixture is transferred to a mold, and in this embodiment, the interior of the mold is a rectangular parallelepiped of 100 mm x 100 mm x 10 mm; and the hydrated salt formed phase change material S9 is obtained by curing at 5°C for one day.

[0064] The surface of the hydrated salt-formed phase change material S9 was rinsed with an oxygen molecular plasma flow in a vacuum environment for 1 minute to improve the adhesion of the coating. 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 coated with the adhesive was placed under an ultraviolet lamp to form a film, thereby obtaining a solar temperature control backplane S10 based on a shaped phase change material (hydrated salt).

[0065] The formed paraffin phase change materials S1~S6, the formed hydrated salt phase change material S9 and the formed back plates S7, S8 and S10 were placed in a drying oven at an ambient temperature of 50 ℃ and continuously heated. Their masses were measured again. The ratio of the mass reduction to the original mass is the leakage rate. The test results are shown in Figures 3 to 5 As shown. Figure 3 It can be seen that after continuous heating for 450 h, when the mass ratio of epoxy resin to curing agent is 2.5:1, the leakage rate is the lowest; when the mass ratio of paraffin powder to premixed epoxy resin is 7:3, the leakage rate is the lowest; after preparing a waterproof coating film on the surface of the formed phase change material, the anti-leakage performance of the backplane is further enhanced (after continuous heating for 450 h, the leakage rate of S7 is still kept within 5%); Figure 4 It can be seen that the present invention uses light-curing adhesive as a waterproof coating film, and its anti-leakage effect is better than that of the three-proof paint coating film; Figure 5 It can be seen that the anti-leakage effect of using paraffin as the phase change material is better than that of hydrated salt. The above results show that the solar temperature control backplane prepared by the present invention using a specific phase change material and a premixed epoxy resin in a certain ratio to form a phase change material after coating treatment has good anti-leakage performance.

[0066] The curing process in Example 1 is directly carried out on the back of the solar cell, and after washing and preparing a waterproof coating film, a solar temperature control backsheet based on a fixed phase change material is obtained; a test is conducted under a standard sunlight intensity to compare the traditional backsheet and the solar temperature control backsheet of the present invention (see the actual picture) Figure 6 ) operating temperature and power generation. The experimental results are shown in Figure 7 The results show that compared with the cooling system of the traditional backplane, the temperature rise rate of the solar temperature control backplane of the present invention is reduced by 21.5%, and the power generation within 4000 seconds is increased by 5%. This result shows that the solar temperature control backplane of the present invention can be in direct or close contact with the battery cell, which can more directly and effectively control the temperature of the battery cell and improve the working efficiency and service life of the battery cell.

[0067] Example 2

[0068] A topological optimization design of a solar temperature control backplane structure based on a shaped phase change material, the preparation 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, and the grinding environment temperature is ensured to be below 25°C. The amount of paraffin is determined according to the size of the grinding instrument; in this embodiment, the volume of the mortar is about 700 mL, and 80 g of paraffin is added each time; the mortar and pestle pressure and grinding time are set, and the particle size distribution of the paraffin powder obtained by grinding is shown in the figure; the paraffin powder is frozen at -80°C for later use.

[0070] The second step is to prepare premixed epoxy resin. The epoxy resin is bisphenol F epoxy resin (Nan Ya 170 bisphenol F epoxy resin), and the curing agent is phenolic amine curing agent (593 phenolic amine curing agent); first, the epoxy resin and curing agent are premixed in a vacuum planetary gravity mixer at a mass ratio of 2.5:1, and the speed of the mixer is set to 900 RPM for 1 minute to obtain the premixed epoxy resin, which is taken out and stored at -20 °C for use.

[0071] In the third step, the paraffin powder stored at -80 ° C and the premixed epoxy resin are placed in a vacuum planetary gravity mixer at a mass ratio of 7:3 to obtain a mixture, and the mixing is carried out in three stages: in the first stage, the speed is 600 PRM and the time is 1 minute; in the second stage, the speed is 900 PRM and the time is 5 minutes; in the third stage, the speed is 600 PRM and the time is 1 minute; the mixture is transferred to a mold, and the mold in this embodiment is a fin structure mold; and the formed phase change material is cured in a refrigerator environment (ambient temperature 5 ° C) for one day.

[0072] The fourth step is to activate the surface of the formed phase change material. The surface of the formed phase change material is washed with oxygen molecular plasma in a vacuum environment for 1 minute to improve the adhesion of the coating.

[0073] Step 5: Prepare a waterproof coating film. Use a spraying tool to evenly apply the light-curing glue (D-5604 UV-curing glue) on the surface of the formed phase change material to a moderate thickness, and place the glue-coated part under a UV lamp to form a film to obtain a solar temperature control backplane based on a fixed phase change material (see the structural schematic diagram of the solar temperature control backplane with a fin structure). Figure 8 ), the film has good waterproof and moisture-proof properties.

[0074] The solar temperature control back panel of this embodiment adopts a fin structure, and the side of the fin is perpendicular to the horizontal plane. Experimental results show that the fin structure arranged in this way promotes heat dissipation by increasing the surface area, thereby improving the heat dissipation effect; the spacing between the fins plays a vital role in this structure, which can maintain proper air circulation, thereby maximizing the heat dissipation efficiency.

[0075] The above specific embodiments describe the implementation of the present invention in detail, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the claims and technical concept of the present invention, the technical solution of the present invention can be modified and changed in many simple ways, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A method for preparing a solar temperature control backplane based on a shaped phase change material, characterized in that: The following steps are involved: (1) Precool the paraffin to below -80°C, and then grind it into powder at a temperature below 25°C. (2) premixing the epoxy resin and the curing agent to obtain a premixed epoxy resin; uniformly mixing the paraffin powder and the premixed epoxy resin in a mass ratio of (7-6): (3-4), and curing to obtain a formed phase change material; (3) The surface of the formed phase change material is washed by plasma jet, and then a waterproof coating film is prepared on the surface of the formed phase change material to obtain a solar temperature control backplane based on the shaped phase change material.

2. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The curing process is carried out on the back of the solar cell, and after being washed by plasma flow and preparing a waterproof coating film, a solar temperature control backplane based on a shaped phase change material is obtained; Alternatively, the solar temperature control backboard based on the shaped phase change material is obtained by curing and forming separately, washing by plasma jet, preparing a waterproof coating film, and then attaching it to the back of the solar cell panel by an adhesive material.

3. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The phase transition temperature of the paraffin is 30°C.

4. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The epoxy resin includes bisphenol F epoxy resin; the curing agent includes phenolic amine curing agent.

5. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The mass ratio of the epoxy resin to the curing agent is (1.5~3):

1.

6. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The grinding method is mortar-type cold grinding.

7. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The curing temperature is 5°C.

8. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The operation of preparing the waterproof coating film is as follows: the light-curing glue is evenly applied on the surface of the formed phase change material by a roller or a spraying tool, and the part coated with the glue is placed under an ultraviolet lamp to form a film.

9. The method for preparing a solar temperature control backplane based on a shaped phase change material according to claim 1, characterized in that: The solar temperature control back plate based on the shaped phase change material is a fin structure, and the side surface of the fin is perpendicular to the horizontal plane.

10. A solar temperature control backplane based on a shaped phase change material prepared by the method according to any one of claims 1 to 9.

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