A photovoltaic panel and photovoltaic assembly for solar cells

Abstract

The utility model relates to photovoltaic panel technical field discloses a solar cell is with photovoltaic panel and photovoltaic module. The solar cell is with photovoltaic panel includes base material layer, and the one side of base material layer faces solar cell and is equipped with adhesive layer, and the one side of base material layer faces outside air and is equipped with air surface protective layer, air surface protective layer includes weatherable fiber net structure, and weatherable fiber net structure's mesh fills in protective resin, base material layer includes ultraviolet resistant fiber net structure, and ultraviolet resistant fiber net structure's mesh fills in base material resin. The solar cell is with photovoltaic panel through the cooperation of air surface protective layer and base material layer, can greatly strengthen the overall strength of photovoltaic panel, weather resistance, ultraviolet resistance and anti -aging ability, and the fiber net structure of the two layers can effectively disperse the load of outside application simultaneously, makes stress evenly distribute in photovoltaic panel inside, thereby can reduce local stress concentration phenomenon, and further can reduce the risk of photovoltaic panel cracking and breaking, improves its anti -cracking ability.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic panel technology, specifically to a photovoltaic panel and photovoltaic module for solar cells. Background Technology

[0002] Solar panels are exposed to the elements for extended periods, subjecting themselves to corrosion from harsh outdoor environments such as ultraviolet radiation, high temperatures, wind, sand, rain, and snow. The photovoltaic backsheet, a crucial component of the solar panel, directly impacts the protection of the solar cells through its weather resistance and mechanical strength, which in turn directly affects the long-term stable operation of the photovoltaic module in harsh outdoor conditions.

[0003] Aging of photovoltaic (PV) backsheets can occur in various forms, including cracking, blistering, and powdering, ultimately leading to the failure of their protective functions. After a PV backsheet fails, the solar cells are prone to corrosion, displacement, or detachment, affecting the overall photoelectric conversion efficiency of the PV module. In severe cases, this can lead to module failure and pose certain safety risks. Therefore, PV backsheets with excellent weather resistance and mechanical strength can effectively resist the adverse effects of these harsh outdoor environments, extending the lifespan of the solar panels while maintaining the high photoelectric conversion efficiency of the solar cells. Furthermore, replacing failed PV backsheets incurs considerable costs, significantly negatively impacting the levelized cost of electricity (LCOE). Therefore, PV backsheets with excellent weather resistance can reduce the frequency of replacement, thereby lowering the LCOE and maintenance costs. Thus, the weather resistance and mechanical strength of PV backsheets (such as PET backsheets) are key performance indicators.

[0004] However, the weather resistance and / or mechanical strength of existing photovoltaic backsheets (such as those published under CN221805545U, CN117174774A, and CN111634074A) are not ideal. They are prone to cracking and brittle fracture after being used in certain extreme outdoor environments or after long-term outdoor use and aging, which affects their protective function for photovoltaic modules and cells. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a photovoltaic panel and photovoltaic module for solar cells.

[0006] Based on this, the present invention discloses a photovoltaic panel for solar cells, including a substrate layer, wherein an adhesive layer is provided on the side of the substrate layer facing the solar cell, and an air surface protection layer is provided on the side of the substrate layer facing the external air.

[0007] The air-surface protective layer includes a weather-resistant fiber mesh structure, the mesh of which is filled with protective resin; the substrate layer includes an anti-ultraviolet fiber mesh structure, the mesh of which is filled with substrate resin.

[0008] Preferably, the thickness of the air-surface protective layer is 8-22 μm.

[0009] More preferably, the weather-resistant fiber mesh structure is formed by interlacing weather-resistant fibers with a diameter of 0.5-1.5 μm; the weather-resistant fibers are polytetrafluoroethylene fibers.

[0010] More preferably, the protective resin is an UV-resistant acrylic resin, polyurethane resin, or fluororesin.

[0011] Preferably, the thickness of the substrate layer is 200-300 μm.

[0012] More preferably, the UV-resistant fiber mesh structure is formed by cross-linking UV-resistant fibers with a diameter of 0.5-1.5 μm; the UV-resistant fibers are acrylic fibers.

[0013] More preferably, the substrate resin is polyethylene terephthalate, polypropylene, or polyethylene 2,5-furandicarboxylate (preferably polyethylene terephthalate).

[0014] Preferably, the adhesive layer is a polyurethane adhesive layer with a thickness of 4-12 μm.

[0015] More preferably, the side of the adhesive layer facing the solar cell has an uneven surface.

[0016] This utility model also discloses a photovoltaic module, including a photovoltaic front panel, a first encapsulating film, a solar cell, a second encapsulating film, and a photovoltaic back panel; the photovoltaic back panel and / or photovoltaic front panel are the photovoltaic panels for solar cells described above in this utility model.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] Therefore, existing photovoltaic panels suffer from insufficient weather resistance and / or mechanical strength, and are prone to cracking and brittle fracture after long-term aging. This invention addresses these issues by using a weather-resistant fiber mesh structure and protective resin filling the mesh of the photovoltaic panel's air-surface protective layer to enhance its weather resistance and anti-aging capabilities. Meanwhile, the substrate layer, through an anti-UV fiber mesh structure and substrate resin filling the mesh, enhances the panel's support and UV resistance. Furthermore, the combination of the air-surface protective layer and the substrate layer, with their interconnected fiber mesh structures via nodes or intersections using resin filling the mesh, forms a unified whole, significantly strengthening the overall strength of the photovoltaic panel. Simultaneously, both fiber mesh structures effectively disperse externally applied loads, ensuring uniform stress distribution within the photovoltaic panel. This reduces localized stress concentration, thereby lowering the risk of cracking and fracture, and improving its crack resistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of a photovoltaic panel for solar cells according to this embodiment.

[0020] Explanation of reference numerals: 1. Air surface protective layer; 1-1. Weather-resistant fiber mesh structure; 1-2. Protective resin; 2. Substrate layer; 2-1. UV-resistant fiber mesh structure; 2-2. Substrate resin; 3. Adhesive layer. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example

[0023] This embodiment describes a photovoltaic panel for solar cells; see [link / reference]. Figure 1 The photovoltaic panel comprises an air-side protective layer 1, a substrate layer 2, and an adhesive layer 3, stacked on top of each other. The adhesive layer 3 is located on the side of the substrate layer 2 facing the solar cell. This adhesive layer 3 is bonded to the surface of the solar cell via an encapsulating film, thus achieving a strong bond between the photovoltaic panel and the solar cell. The air-side protective layer 1 is located on the side of the substrate layer 2 facing the external air to protect the photovoltaic panel from outdoor environmental damage such as ultraviolet radiation, wind, sand, rain, and snow, thereby extending the lifespan of the photovoltaic panel itself, as well as the solar cell and photovoltaic module.

[0024] The air-surface protective layer 1 includes a weather-resistant fiber mesh structure 1-1, which is formed by interlacing weather-resistant fibers with a diameter of 0.5-1.5 μm (e.g., 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, or 1.5 μm). Specifically, the weather-resistant fibers are polytetrafluoroethylene fibers or other weather-resistant fibers.

[0025] Furthermore, the mesh openings of the weather-resistant fiber mesh structure 1-1 are filled with protective resin 1-2; thus, the protective resin 1-2 filling the mesh openings of the weather-resistant fiber mesh structure 1-1 forms an air-surface protective layer 1. In practice, the thickness of the air-surface protective layer 1 is 8-22 μm (e.g., 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, or 22 μm). Specifically, the protective resin 1-2 is an ultraviolet-resistant acrylic resin, polyurethane resin, or fluororesin.

[0026] Therefore, the air-surface protective layer 1 of this embodiment, through the combination of the weather-resistant fiber mesh structure 1-1 and the UV-resistant protective resin 1-2 filled in its mesh, can improve the weather resistance, UV resistance and aging resistance of the photovoltaic panel. At the same time, the weather-resistant fiber mesh structure 1-1 can also effectively disperse the externally applied load, so that the stress is evenly distributed in the air-surface protective layer 1 and inside the photovoltaic panel, thereby reducing the phenomenon of local stress concentration, and thus reducing the risk of cracking and breakage of the photovoltaic panel, and enhancing the mechanical strength and crack resistance of the photovoltaic panel.

[0027] The substrate layer 2 includes an anti-UV fiber mesh structure 2-1, which is formed by interlacing anti-UV fibers with a diameter of 0.5-1.5 μm (e.g., 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, or 1.5 μm). Specifically, the anti-UV fibers are acrylic fibers or other anti-UV fibers.

[0028] Furthermore, the mesh openings of the UV-resistant fiber mesh structure 2-1 are filled with a substrate resin 2-2; thus, the substrate resin 2-2 filling the mesh openings of the UV-resistant fiber mesh structure 2-1 forms the substrate layer 2. In practice, the thickness of the substrate layer 2 is 200-300 μm (e.g., 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm, or 300 μm). Specifically, the substrate resin 2-2 is polyethylene terephthalate, polypropylene, or polyethylene 2,5-furandicarboxylate.

[0029] Therefore, the substrate layer 2 in this embodiment, through the combination of the above-mentioned anti-ultraviolet fiber mesh structure 2-1 and the substrate resin 2-2 filled in its mesh, can improve the photovoltaic panel's anti-ultraviolet properties, mechanical strength, supporting function and crack resistance.

[0030] Therefore, existing photovoltaic panels suffer from insufficient weather resistance and / or mechanical strength, and are prone to cracking and brittle fracture after long-term aging. In this embodiment, the photovoltaic panel utilizes the combination of the aforementioned air-surface protective layer 1 and the substrate layer 2. The fiber mesh structures of these two layers, connected by resin filling the mesh openings, can be linked together at nodes or intersections to form a unified whole, significantly enhancing the overall strength of the photovoltaic panel. Simultaneously, the fiber mesh structures of both layers effectively disperse externally applied loads, ensuring uniform stress distribution within the photovoltaic panel. This reduces localized stress concentration, thereby lowering the risk of cracking and fracture, and improving its crack resistance.

[0031] The adhesive layer 3 is preferably a polyurethane adhesive layer, and the thickness of the adhesive layer 3 is 4-12 μm (e.g., 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm or 12 μm).

[0032] Furthermore, the side of the adhesive layer 3 facing the solar cell has an uneven surface. This increases the contact area between the adhesive layer 3 and the encapsulating film, strengthening the adhesive strength and bonding firmness, and preventing the photovoltaic panel from detaching from the photovoltaic module.

[0033] In summary, the photovoltaic panel for solar cells in this embodiment, through the combination of the air surface protective layer 1, the substrate layer 2, and the adhesive layer 3, can effectively resist the erosion of adverse factors such as ultraviolet rays, high temperature, humidity, and wind and sand, prevent damage to the solar cells, and thus ensure that the photovoltaic module continues to work efficiently under complex and changeable climatic conditions, thereby improving the reliability and stability of the photovoltaic module for outdoor use.

[0034] A photovoltaic module according to this embodiment includes a photovoltaic front panel, a first encapsulating film, a solar cell, a second encapsulating film, and a photovoltaic back panel; the photovoltaic back panel and / or the photovoltaic front panel (especially the photovoltaic back panel) is a photovoltaic panel for solar cells as described above in this embodiment.

[0035] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0036] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A photovoltaic panel for solar cells, characterized in that, It includes a substrate layer, wherein an adhesive layer is provided on the side of the substrate layer facing the solar cell, and an air surface protection layer is provided on the side of the substrate layer facing the outside air. The air-surface protective layer includes a weather-resistant fiber mesh structure, the mesh of which is filled with protective resin; the substrate layer includes an anti-ultraviolet fiber mesh structure, the mesh of which is filled with substrate resin.

2. A photovoltaic panel for solar cells according to claim 1, characterized in that, The thickness of the air-surface protective layer is 8-22 μm.

3. A photovoltaic panel for solar cells according to claim 1 or 2, characterized in that, The weather-resistant fiber mesh structure is formed by interlacing weather-resistant fibers with a diameter of 0.5-1.5μm; the weather-resistant fibers are polytetrafluoroethylene fibers.

4. A photovoltaic panel for solar cells according to claim 1 or 2, characterized in that, The protective resin is an UV-resistant acrylic resin, polyurethane resin, or fluororesin.

5. A photovoltaic panel for solar cells according to claim 1, characterized in that, The thickness of the substrate layer is 200-300 μm.

6. A photovoltaic panel for solar cells according to claim 1 or 5, characterized in that, The UV-resistant fiber mesh structure is formed by cross-linking UV-resistant fibers with a diameter of 0.5-1.5 μm; the UV-resistant fibers are acrylic fibers.

7. A photovoltaic panel for solar cells according to claim 1 or 5, characterized in that, The substrate resin is polyethylene terephthalate, polypropylene, or polyethylene 2,5-furandicarboxylate.

8. A photovoltaic panel for solar cells according to claim 1, characterized in that, The adhesive layer is a polyurethane adhesive layer with a thickness of 4-12 μm.

9. A photovoltaic panel for solar cells according to claim 1 or 8, characterized in that, The side of the adhesive layer facing the solar cell has an uneven surface.

10. A photovoltaic module, comprising a photovoltaic front panel, a first encapsulating film, a solar cell, a second encapsulating film, and a photovoltaic back panel; characterized in that, The photovoltaic backsheet and / or photovoltaic frontsheet is a photovoltaic panel for solar cells as described in any one of claims 1-9.

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