A flexible solar panel and a method of manufacturing the same

Abstract

The application provides a flexible solar panel, which comprises, from top to bottom, a back plate, a first EVA adhesive film, a first epoxy resin glass fiber cloth, a battery piece, a second epoxy resin glass fiber cloth, a second EVA adhesive film and an ETFE film; the flexible solar panel further comprises a copper mesh for connecting the battery pieces in series; the raw materials for preparing the first epoxy resin glass fiber cloth and the second epoxy resin glass fiber cloth independently comprise a glass fiber cloth and an impregnating liquid, and the impregnating liquid comprises 40-60 parts by weight of silica modified epoxy resin, 40-60 parts by weight of MDI modified epoxy resin, 8-12 parts by weight of a curing agent, 8-12 parts by weight of inorganic powder and 180-210 parts by weight of a first solvent; the flexible solar panel has good impact resistance, high and low temperature cycle resistance, bending resistance and photoelectric conversion rate. The application further provides a preparation method of the flexible solar panel.

Description

Technical Field

[0001] This application relates to the field of photovoltaic product technology, and in particular to a flexible solar panel and its preparation method. Background Technology

[0002] Flexible solar panels are innovative products based on thin-film solar cell technology, characterized by their thinness, portability, and flexibility. Their applications are very broad, covering multiple fields such as automobiles and ships, distributed power generation, building integration, electronic charging, and recreational vehicles. Based on these diverse applications, the market share of flexible solar panels has shown a significant upward trend in recent years.

[0003] Flexible solar panels typically use lightweight, flexible materials as their substrate. While these materials offer good flexibility and lightness, they are relatively weak in mechanical strength and impact resistance. Therefore, flexible solar panels are prone to cracking under external forces. The encapsulation materials are also susceptible to aging, leading to a decrease in the protective performance of the encapsulation layer and consequently affecting the stability of the solar cells. Furthermore, flexible solar panels are often installed on curved surfaces or in areas requiring frequent bending. Under prolonged exposure to bending, vibration, and harsh environments such as wind, rain, and snow, the solar cells are prone to microcracks due to mechanical stress. During installation, transportation, or use, external impacts can also easily cause microcracks in the solar cells.

[0004] The presence of microcracks can prevent some current from being output normally from the solar cells, thus causing partial failure of the solar cells and a significant decrease in the output power of the module. Further expansion of the cracks will accelerate the power decay of the solar cells and shorten the lifespan of the module.

[0005] Therefore, it is necessary to provide a flexible solar panel that provides good protection for the solar cells. Summary of the Invention

[0006] To address the above problems, the present invention provides a flexible solar panel, which comprises, from top to bottom: a backsheet, a first EVA film, a first epoxy resin fiberglass cloth, solar cells, a second epoxy resin fiberglass cloth, a second EVA film, and an ETFE film; the flexible solar panel also includes a copper mesh for connecting the solar cells in series.

[0007] The raw materials for preparing the first epoxy resin glass fiber cloth and the second epoxy resin glass fiber cloth each independently include glass fiber cloth and impregnation liquid. The impregnation liquid includes: 40-60 parts by weight of silica-modified epoxy resin, 40-60 parts by weight of MDI-modified epoxy resin, 8-12 parts by weight of curing agent, 8-12 parts by weight of inorganic powder, and 180-210 parts by weight of first solvent.

[0008] Through the above technical solutions, silica-modified epoxy resin can significantly improve the mechanical properties, thermal stability, and durability of epoxy resin. Nano-silica possesses unique optical properties, reflecting ultraviolet rays and absorbing infrared rays, thereby reducing the degradation effect of ultraviolet rays on epoxy resin and increasing its anti-aging properties. MDI-modified epoxy resin exhibits excellent heat resistance, mechanical properties, and adhesion. By using silica-modified epoxy resin and MDI-modified epoxy resin in combination in the impregnation solution, the mechanical properties of the epoxy resin fiberglass cloth are improved, and the affinity between the epoxy resin fiberglass cloth and the solar cells is enhanced. This further achieves a good protective effect of the epoxy resin fiberglass cloth on the solar cells, giving them good impact resistance, high and low temperature cycling resistance, and bending resistance. Silica-modified epoxy resin and MDI-modified epoxy resin have a significant synergistic effect in improving the impact resistance, high and low temperature cycling resistance, and bending resistance of flexible solar panels.

[0009] Preferably, the preparation method of the first epoxy resin glass fiber cloth and the second epoxy resin glass fiber cloth includes: impregnating alkali-free glass fiber cloth in the above impregnation solution, drying, and hot pressing to obtain epoxy resin glass fiber cloth.

[0010] Preferably, the weight ratio of alkali-free glass fiber cloth to impregnation liquid is 60:40.

[0011] Preferably, the copper mesh is screen-printed or laser-etched onto the battery cell.

[0012] Preferably, the first solvent is acetone.

[0013] Preferably, the weight ratio of silica-modified epoxy resin to MDI-modified epoxy resin is 4-9:6.

[0014] Through the above technical solution, the weight ratio of silica-modified epoxy resin to MDI-modified epoxy resin is controlled at 4-9:6. The epoxy resin fiberglass cloth possesses both excellent mechanical properties and affinity with solar cells. When applied in flexible solar panels, it protects the solar cells, making them impact-resistant, resistant to high and low temperature cycling, and resistant to bending, thereby increasing their service life.

[0015] Preferably, the method for preparing the silica-modified epoxy resin includes: adding epoxy resin to a second solvent, adding silica, stirring and reacting, removing the second solvent, and obtaining silica-modified epoxy resin, wherein the weight ratio of silica to epoxy resin is 4-8:65.

[0016] Preferably, silicon dioxide is replaced by an equal weight of modified silicon dioxide, wherein the modified silicon dioxide is silicon dioxide modified by a silane coupling agent.

[0017] Through the above technical solution, nano-silica is easily agglomerated. Modifying the silica surface with siloxanes makes the silica-modified epoxy resin more uniform, further improving its performance. Furthermore, the modified silica-modified epoxy resin and MDI-modified epoxy resin can achieve better synergy. When used together, they are more effective in protecting the solar cells, further enhancing the impact resistance, high and low temperature cycling resistance, and bending resistance of flexible solar panels.

[0018] Preferably, the second solvent is acetone.

[0019] Preferably, the preparation method of the MDI-modified epoxy resin includes: adding epoxy resin to a third solvent, adding a catalyst and MDI (diphenylmethane diisocyanate), reacting, and obtaining the MDI-modified epoxy resin.

[0020] Preferably, the weight ratio of MDI to epoxy resin is 14-18:65.

[0021] Preferably, the MDI is composed of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a mass ratio of 9-25:15.

[0022] Through the above technical solution, the two isocyanate groups of 4,4'-MDI are located at the para position of the benzene ring, exhibiting high reactivity and symmetry. This symmetry allows 4,4'-MDI to form a more regular network structure during the reaction, thereby improving the mechanical properties and thermal stability of the material. In contrast, one isocyanate group of 2,4'-MDI is located at the para position of the benzene ring, and the other at the ortho position. This asymmetric structure results in relatively lower reactivity but provides better flexibility. Combining 4,4'-MDI and 2,4'-MDI with modified epoxy resin allows for better synergy between the MDI-modified epoxy resin and the silica-modified epoxy resin. When used together, this enhances the protection of the solar cells, improving the impact resistance, high and low temperature cycling resistance, and bending resistance of the flexible solar panel.

[0023] Preferably, the second solvent is butanone.

[0024] In a second aspect, the present invention provides a method for preparing the above-mentioned flexible solar panel, comprising the following steps: encapsulating a backsheet, a first EVA film, a first epoxy resin fiberglass cloth, a solar cell, a second epoxy resin fiberglass cloth, a second EVA film, and an ETFE film in sequence, and laminating them to obtain the flexible solar panel.

[0025] Preferably, the method for preparing a flexible solar panel includes the following steps:

[0026] The backsheet, the first EVA film, the first epoxy resin fiberglass cloth, and the battery cells are encapsulated in sequence and laminated to obtain the pre-pressed module.

[0027] The pre-pressed components, the second epoxy resin fiberglass cloth, the second EVA film, and the ETFE film are sequentially encapsulated and laminated to obtain the flexible solar panel.

[0028] By using the above technical solution, the first EVA film, the first epoxy resin fiberglass cloth, and the battery cell are sequentially encapsulated and pre-pressed. Then, the pre-pressed component, the second epoxy resin fiberglass cloth, the second EVA film, and the ETFE film are sequentially encapsulated and laminated again. This achieves tight encapsulation of the battery, especially enabling a more secure bond between the copper wires and the battery. This improves the photoelectric conversion efficiency, impact resistance, resistance to high and low temperature cycling, and bending resistance.

[0029] The back is a CPC backplate.

[0030] In summary, the present invention has at least one of the following beneficial technical effects:

[0031] 1. This application provides a flexible solar panel in which the solar cells are protected by epoxy resin fiberglass cloth. An impregnation solution for the epoxy resin fiberglass cloth is prepared, comprising silica-modified epoxy resin and MDI-modified epoxy resin. The combined use of silica-modified epoxy resin and MDI-modified epoxy resin improves both the mechanical properties of the epoxy resin fiberglass cloth and the affinity between the epoxy resin fiberglass cloth and the solar cells, further enhancing the protective effect of the epoxy resin fiberglass cloth on the solar cells and giving them good impact resistance, high and low temperature cycling resistance, and bending resistance.

[0032] 2. This application provides a method for preparing the above-mentioned flexible solar panel. Through a specific lamination process, the battery is tightly encapsulated, especially enabling a tighter bond between the copper wire and the battery, thereby improving the photoelectric conversion efficiency, impact resistance, high and low temperature cycling resistance, and bending resistance. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. However, the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention. CPC backsheet, EVA film, and ETFE film are all commercially available materials commonly used in solar panels.

[0034] Preparation Example 1

[0035] Preparation of silica-modified epoxy resin:

[0036] 65 parts by weight of bisphenol A type epoxy resin E51 were added to 600 parts by weight of acetone, and 6 parts by weight of nano silica were added while stirring. The mixture was stirred for 3 hours, and the acetone was removed by vacuum distillation to obtain silica-modified epoxy resin.

[0037] Preparation Example 2

[0038] The difference between Preparation Example 2 and Preparation Example 1 is only that modified silica was used instead of nano silica by weight. The preparation method of modified silica includes: adding nano silica to a 3 wt% solution of silane coupling agent (KH550) diluted with N-methylpyrrolidone, reacting for 6 h under a nitrogen atmosphere, centrifuging, and separating to obtain modified silica. The mass ratio of nano silica to the diluted silane coupling agent solution is 1:20.

[0039] Preparation Example 3

[0040] Preparation of MDI-modified epoxy resin:

[0041] 65 parts by weight of bisphenol A type epoxy resin E51 and 20 parts by weight of butanone were mixed and heated to 80°C. Then, 0.3 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, 0.1 parts by weight of boric acid, 0.15 parts by weight of citric acid, 8 parts by weight of 4,4'-diphenylmethane diisocyanate, and 8 parts by weight of 2,4'-diphenylmethane diisocyanate were added. The mixture was stirred evenly and heated to 120°C. After reacting for 1 hour, MDI-modified epoxy resin was obtained.

[0042] Preparation Example 4

[0043] The only difference between Preparation Example 4 and Preparation Example 3 is that the weight parts of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in the raw materials for preparing MDI-modified epoxy resin are different. In Preparation Example 4, 4,4'-diphenylmethane diisocyanate is 6 parts by weight and 2,4'-diphenylmethane diisocyanate is 10 parts by weight.

[0044] Preparation Example 5

[0045] The only difference between Preparation Example 5 and Preparation Example 3 is that the weight parts of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in the raw materials for preparing MDI-modified epoxy resin are different. In Preparation Example 5, 4,4'-diphenylmethane diisocyanate is 10 parts by weight and 2,4'-diphenylmethane diisocyanate is 6 parts by weight.

[0046] Preparation Example 6

[0047] Preparation of epoxy resin co-modified with silica and MDI:

[0048] 65 parts by weight of bisphenol A type epoxy resin E51 and 20 parts by weight of butanone were mixed and heated to 80°C. Then, 0.3 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, 0.1 parts by weight of boric acid, 0.15 parts by weight of citric acid, 8 parts by weight of 4,4'-diphenylmethane diisocyanate, 8 parts by weight of 2,4'-diphenylmethane diisocyanate, and 6 parts by weight of nano-silica were added. The mixture was stirred evenly, heated to 120°C, and reacted for 1 hour to obtain a silica and MDI co-modified epoxy resin.

[0049] Example 1

[0050] Methods for manufacturing solar panels include:

[0051] Step 1): Preparation of impregnation solution: Mix 50 parts by weight of silica-modified epoxy resin, 50 parts by weight of MDI-modified epoxy resin, 9 parts by weight of dicyandiamide, 10 parts by weight of talc and 190 parts by weight of acetone to obtain impregnation solution, wherein the silica-modified epoxy resin was prepared by Preparation Example 1 and the MDI-modified epoxy resin was prepared by Preparation Example 3;

[0052] Step 2): Immerse the alkali-free glass fiber cloth in the impregnation solution obtained in Step 1), with the weight ratio of alkali-free glass fiber cloth to impregnation solution being 60:40. Immerse for 6 hours, dry, and hot press to obtain epoxy resin glass fiber cloth (thickness 0.2 mm).

[0053] Step 3): After texturing the surface of the solar cell, an electronic copper mesh is inlaid onto the surface of the solar cell using screen printing or laser etching technology. High-temperature curing technology is then used to tightly bond the electronic copper mesh (approximately 10-20 μm thick) to the solar cell. The copper mesh is designed with a grid-like layout to reduce resistance loss and improve current transmission efficiency.

[0054] Step 4): The solar panel, from top to bottom, consists of a CPC backsheet, an EVA film (0.3mm thick), an epoxy resin fiberglass cloth (0.2mm thick) obtained in Step 2), solar cells, another epoxy resin fiberglass cloth (0.2mm thick) obtained in Step 2), an EVA film (0.3mm thick), and an ETFE film (0.1mm thick).

[0055] First, the CPC backsheet, EVA film (0.3mm thick), epoxy resin fiberglass cloth (0.2mm thick) obtained in step 2), and solar cells are packaged in sequence, placed in a laminator, vacuumed, laminated at 135℃, and subjected to 0.5-1MPa pressure for 15 minutes to obtain the pre-pressed module.

[0056] The pre-pressed components, epoxy resin fiberglass cloth (0.2 mm thick), EVA film (0.3 mm thick), and ETFE film (0.1 mm thick) obtained in step 2) are then encapsulated in sequence, placed in a laminator, vacuumed, laminated at 145°C, and subjected to a pressure of 1.5-2 MPa for 20 minutes. After cooling, the solar panel is obtained.

[0057] Example 2

[0058] The only difference between Example 2 and Example 1 is that the weight parts of silica-modified epoxy resin and MDI-modified epoxy resin in the impregnation solution in step 1) are different. In Example 2, the silica-modified epoxy resin in the impregnation solution is 40 parts by weight and the MDI-modified epoxy resin is 60 parts by weight.

[0059] Example 3

[0060] The only difference between Example 3 and Example 1 is that the weight parts of silica-modified epoxy resin and MDI-modified epoxy resin in the impregnation solution in step 1) are different. In Example 3, the silica-modified epoxy resin in the impregnation solution is 60 parts by weight and the MDI-modified epoxy resin is 40 parts by weight.

[0061] Example 4

[0062] The only difference between Example 4 and Example 1 is that the silica-modified epoxy resin in the impregnation solution in step 1) is the silica-modified epoxy resin prepared in Example 2.

[0063] Example 5

[0064] The only difference between Example 5 and Example 1 is that the MDI-modified epoxy resin in the impregnation solution in step 1) is the MDI-modified epoxy resin prepared in Example 4.

[0065] Example 6

[0066] The only difference between Example 6 and Example 1 is that the MDI-modified epoxy resin in the impregnation solution in step 1) is the MDI-modified epoxy resin prepared in Example 5.

[0067] Example 7

[0068] The only difference between Example 7 and Example 1 is the lamination process in step 4). In Example 7, step 4) is as follows: The solar panel, from top to bottom, consists of a CPC backsheet, an EVA film (0.3 mm thick), an epoxy resin fiberglass cloth (0.2 mm thick) obtained in step 2), a solar cell, an epoxy resin fiberglass cloth (0.2 mm thick), an EVA film (0.3 mm thick), and an ETFE film (0.1 mm thick).

[0069] First, the battery cells, epoxy resin fiberglass cloth (0.2 mm thick), EVA film (0.3 mm thick), and ETFE film (0.1 mm thick) obtained in step 2) are encapsulated in sequence, placed in a laminator, vacuumed, laminated at 135℃, and subjected to a pressure of 0.5-1 MPa for 15 minutes to obtain the pre-pressed module.

[0070] Next, the CPC backsheet, EVA film (0.3mm thick), epoxy resin fiberglass cloth (0.2mm thick) obtained in step 2), and pre-pressed components are packaged in sequence, placed in a laminator, vacuumed, laminated at 145℃, with a pressure of 1.5-2MPa applied for 20 minutes, and cooled to obtain the solar panel.

[0071] Example 8

[0072] The only difference between Example 8 and Example 1 is the lamination process in step 4). In Example 8, step 4) is as follows: The solar panel, from top to bottom, consists of a CPC backsheet, an EVA film (0.3 mm thick), an epoxy resin fiberglass cloth (0.2 mm thick) obtained in step 2), a solar cell, an epoxy resin fiberglass cloth (0.2 mm thick), an EVA film (0.3 mm thick), and an ETFE film (0.1 mm thick).

[0073] First, the CPC backsheet, EVA film (0.3mm thick), epoxy resin fiberglass cloth (0.2mm thick) obtained in step 2), solar cell, epoxy resin fiberglass cloth (0.2mm thick), EVA film (0.3mm thick), and ETFE film (0.1mm thick) obtained in step 2) are encapsulated in sequence, placed in a laminator, vacuumed, laminated at 135℃, and subjected to a pressure of 0.5-1MPa for 15 minutes to obtain the pre-pressed module;

[0074] The pre-compressed components are then placed in a laminator, vacuumed, laminated at 145°C, and subjected to a pressure of 1.5-2 MPa for 20 minutes. After cooling, the solar panels are obtained.

[0075] Comparative Example 1

[0076] The only difference between Comparative Example 1 and Example 1 is that, in the impregnation solution of step 1), the silica-modified epoxy resin prepared in Preparation Example 1 is replaced by an equal weight of the MDI-modified epoxy resin prepared in Preparation Example 3.

[0077] Comparative Example 2

[0078] The only difference between Comparative Example 2 and Example 1 is that, in the impregnation solution of step 1), the MDI-modified epoxy resin prepared in Preparation Example 3 is replaced by an equal weight of the silica-modified epoxy resin prepared in Preparation Example 1.

[0079] Comparative Example 3

[0080] The only difference between Comparative Example 3 and Example 1 is that the silica-modified epoxy resin prepared in Example 1 and the MDI-modified epoxy resin prepared in Example 3 are replaced by equal weights with the silica and MDI co-modified epoxy resin prepared in Example 6.

[0081] Detection:

[0082] The photoelectric conversion efficiency of the solar panels prepared in the examples and comparative examples was tested under standard test conditions (STC) using equipment manufactured by Shaanxi Zhongsen Electric Power Technology Co., Ltd. The results are shown in Table 1.

[0083] Both the example and comparative examples used 10 N-type TOPCon silicon wafers. 1. The wafers were subjected to a dual 85°C / 85°C high-humidity cycle for 72 hours (high temperature and high humidity 85°C, humidity 85%; low temperature -20°C, held at each temperature for 1 hour), and EL (electroluminescence) was used to detect microcracks. 2. The solar panels of both examples and the comparative examples were laid flat on the ground. A 500g iron ball was raised 50cm each time and allowed to fall freely to the same position on the solar panel. The number of free falls at which the first microcrack appeared was then detected by EL. 3. The solar panels were bent 90° longitudinally 20 times, and EL (electroluminescence) was used to detect microcracks. The results are shown in Table 1.

[0084] Table 1

[0085]

[0086]

[0087] Comparing Comparative Examples 1 and 2 with Example 1, as shown in Table 1, when the impregnation solution contains only silica-modified epoxy resin or only MDI-modified epoxy resin, the photoelectric conversion efficiency decreases, and the impact resistance, high and low temperature cycling resistance, and bending resistance of the flexible solar panel are significantly reduced.

[0088] As shown in Table 1, when silica and MDI are used together to modify epoxy resin in the impregnation solution, the impact resistance, high and low temperature cycling resistance, and bending resistance of the flexible solar panel are significantly reduced.

[0089] As shown in Table 1, when the weight ratio of silica-modified epoxy resin to MDI-modified epoxy resin in the impregnation solution is changed, the photoelectric conversion efficiency of the flexible solar panel changes, and the impact resistance of the flexible solar panel changes significantly.

[0090] As shown in Table 1, when the raw material for preparing the silica-modified epoxy resin in the impregnation solution is changed from silica to silica modified with silane coupling agent, the photoelectric conversion efficiency of the flexible solar panel changes and the impact resistance of the flexible solar panel is significantly improved.

[0091] As shown in Table 1, when the weight ratio of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in the raw materials of MDI-modified epoxy resin in the impregnation solution is changed, the photoelectric conversion efficiency of the flexible solar panel changes, and the impact resistance of the flexible solar panel changes significantly.

[0092] As can be seen from the comparison of Examples 7 and 8 with Example 1 and Table 1, when the lamination process of the flexible solar panel is changed, the photoelectric conversion efficiency of the flexible solar panel changes significantly, and the impact resistance of the flexible solar panel changes significantly.

[0093] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flexible solar panel, characterized in that, From top to bottom, the structure includes: a backsheet, a first EVA film, a first epoxy resin fiberglass cloth, a solar cell, a second epoxy resin fiberglass cloth, a second EVA film, and an ETFE film; the flexible solar panel also includes a copper mesh for connecting the solar cells in series. The raw materials for preparing the first epoxy resin glass fiber cloth and the second epoxy resin glass fiber cloth independently include glass fiber cloth and impregnation liquid, respectively. The impregnation liquid includes: 40-60 parts by weight of silica-modified epoxy resin, 40-60 parts by weight of MDI-modified epoxy resin, 8-12 parts by weight of curing agent, 8-12 parts by weight of inorganic powder and 180-210 parts by weight of first solvent. The weight ratio of silica-modified epoxy resin to MDI-modified epoxy resin is (4-9):

6.

2. The flexible solar panel according to claim 1, characterized in that, The copper mesh is etched into the solar cell.

3. The flexible solar panel according to claim 1, characterized in that, The preparation method of the silica-modified epoxy resin includes: adding epoxy resin to a second solvent, adding silica, stirring and reacting, removing the second solvent, and obtaining silica-modified epoxy resin, wherein the weight ratio of silica to epoxy resin is (4-8):

65.

4. The flexible solar panel according to claim 3, characterized in that, The silicon dioxide is replaced by an equal weight of modified silicon dioxide, wherein the modified silicon dioxide is silicon dioxide modified by a silane coupling agent.

5. The flexible solar panel according to claim 1, characterized in that, The preparation method of the MDI-modified epoxy resin includes: adding epoxy resin to a third solvent, adding a catalyst and MDI, reacting, and obtaining the MDI-modified epoxy resin.

6. The flexible solar panel according to claim 5, characterized in that, The weight ratio of MDI to epoxy resin is (14-18):

65.

7. The flexible solar panel according to claim 5, characterized in that, The MDI is composed of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a mass ratio of (9-25):

15.

8. A method for preparing a flexible solar panel according to any one of claims 1-7, characterized in that, The process includes the following steps: encapsulating and laminating a backsheet, a first EVA film, a first epoxy resin fiberglass cloth, a solar cell, a second epoxy resin fiberglass cloth, a second EVA film, and an ETFE film in sequence to obtain the flexible solar panel.

9. The method for preparing a flexible solar panel according to claim 8, characterized in that, Includes the following steps: The backsheet, the first EVA film, the first epoxy resin fiberglass cloth, and the battery cells are encapsulated in sequence and laminated to obtain the pre-pressed module. The pre-pressed components, the second epoxy resin fiberglass cloth, the second EVA film, and the ETFE film are sequentially encapsulated and laminated to obtain the flexible solar panel.

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