High-water-resistance metal composite backboard and photovoltaic module thereof

Abstract

The utility model discloses a high-water-resistance metal composite backboard which comprises a water-resistance layer, two sides of the water-resistance layer are respectively bonded with an insulating layer through a glue layer, and the outer side of the insulating layer is provided with a coating. The utility model also discloses a photovoltaic assembly. According to the utility model, the waterproof layer is made of the metal material with low water permeability and can effectively prevent water vapor from invading, and the two sides of the waterproof layer are respectively bonded with the insulating layers through the glue layers, so that the insulation treatment of the waterproof layer is realized, and the situation of electric leakage is avoided; according to the utility model, the functional coating is arranged, for example, the coating is made of a mixture of fluoride and an anti-ultraviolet additive, so that the weather resistance of the composite backboard body can be improved, and different pigments can be added according to the requirements of the photovoltaic module body on colors, so that the appearance of the composite backboard body is diversified.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology, specifically relating to a high water-resistant metal composite backsheet and its photovoltaic module. Background Technology

[0002] With the booming development of the photovoltaic industry, the application scenarios of photovoltaics are gradually increasing, and the requirements for the reliability of photovoltaic modules are becoming higher and higher.

[0003] In addition, with the iteration of technology, more efficient N-type battery modules are gradually replacing P-type battery modules. Since the structure and material characteristics of N-type batteries are much more sensitive to water vapor than P-type batteries, conventional single-glass encapsulation methods usually cannot meet the encapsulation requirements of N-type batteries. However, single-glass batteries still have a significant advantage in some distributed and industrial / commercial roofs with load-bearing requirements due to their light weight.

[0004] Therefore, there is an urgent need for a high water-resistant metal composite backsheet to improve the reliability of single-glass modules and solve the leakage problem of metal composite backsheet modules in electrical safety-related tests. Utility Model Content

[0005] The purpose of this invention is to provide a high water-resistant metal composite backsheet to solve the problems mentioned in the background art. The high water-resistant metal composite backsheet provided by this invention improves the reliability of single-glass modules and simultaneously solves the leakage problem of metal composite backsheet modules in electrical safety-related tests.

[0006] Another objective of this invention is to provide a photovoltaic module.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high water-resistant metal composite backplate, comprising a water-resistant layer, an insulating layer bonded to both sides of the water-resistant layer by an adhesive layer, and a coating on the outer side of the insulating layer.

[0008] Furthermore, in this invention, the material of the water-blocking layer includes, but is not limited to, one of aluminum foil, tin foil, or copper foil.

[0009] Furthermore, in this invention, the thickness of the water-blocking layer is 5µm-60µm.

[0010] Furthermore, in this invention, the material of the insulating layer includes, but is not limited to, one of PET, PBT, PC, PA, PMMA, PPS, PO, polyurethane, or resin.

[0011] In this invention, the thickness of the insulating layer is further 50um-400um.

[0012] Furthermore, in this invention, an embossed structure is provided on the side of the insulating layer that contacts the coating near the photovoltaic module body.

[0013] Furthermore, in this invention, the adhesive layer is made of, but is not limited to, one of polyurethane, epoxy resin or acrylic resin.

[0014] In this invention, the thickness of the adhesive layer is further 5µm-30µm.

[0015] Furthermore, in this invention, the coating material is a mixture of fluoride and UV-resistant additives, and the coating thickness is 5µm-30µm.

[0016] Furthermore, in this utility model, a photovoltaic module includes a composite backsheet body, a backsheet film connected to one side of the composite backsheet body, a solar cell connected to one side of the backsheet film, a frontsheet film connected to one side of the solar cell, a frontsheet film connected to one side of the frontsheet film, and a structural frame connected to both sides of the composite backsheet body, the backsheet film, the solar cell, the frontsheet film, and the frontsheet.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The water-blocking layer of this utility model is made of a low-permeability metal material, which can effectively prevent the intrusion of water vapor. Furthermore, an insulating layer is bonded to both sides of the water-blocking layer with an adhesive layer to achieve insulation treatment of the water-blocking layer and avoid leakage.

[0019] 2. This utility model is provided with a functional coating, such as a mixture of fluoride and UV-resistant additives, which can increase the weather resistance of the composite backsheet body. It can also add different pigments to make the appearance of the composite backsheet body more diverse according to the color requirements of the photovoltaic module body.

[0020] 3. The present invention has an embossed structure on the side of the insulating layer that contacts the coating near the photovoltaic module body, which increases the reflection of light on the inner side of the composite backsheet body, thereby effectively improving the power of the photovoltaic module body. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the composite backplate body of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the photovoltaic module body of this utility model;

[0023] In the diagram: 1. Water-blocking layer; 2. Adhesive layer; 3. Insulating layer; 4. Coating; 5. Composite backsheet body; 6. Rear panel adhesive film; 7. Battery cell; 8. Front panel adhesive film; 9. Front panel; 10. Structural frame. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1 The present invention provides the following technical solution: a high water-resistant metal composite backing plate, comprising a water-resistant layer 1, the water-resistant layer 1 being made of aluminum foil and having a thickness of 5 μm; an insulating layer 3 being bonded to both sides of the water-resistant layer 1 by an adhesive layer 2, the adhesive layer 2 being made of polyurethane and having a thickness of 5 μm; an insulating layer 3 being made of PET and having a thickness of 50 μm; and a coating 4 being provided on the outer side of the insulating layer 3, the coating 4 being made of a mixture of fluoride and UV-resistant additives and having a thickness of 5 μm.

[0027] By adopting the above technical solution, the water-blocking layer 1 of this utility model is made of a low-permeability metal material, which can effectively prevent the intrusion of water vapor. Furthermore, an insulating layer 3 is bonded to both sides of the water-blocking layer 1 by an adhesive layer 2, thereby achieving insulation treatment of the water-blocking layer 1 and preventing leakage. This utility model is provided with a functional coating 4. For example, the material of the coating 4 is a mixture of fluoride and UV-resistant additives, which can increase the weather resistance of the composite backsheet body 5. It can also add different pigments according to the color requirements of the photovoltaic module body to make the appearance of the composite backsheet body 5 more diverse.

[0028] Example 2

[0029] The difference between this embodiment and Embodiment 1 is that a high water-resistant metal composite backplate is provided, including a water-resistant layer 1, which is made of tin foil and has a thickness of 35 μm. An insulating layer 3 is bonded to both sides of the water-resistant layer 1 by an adhesive layer 2, which is made of epoxy resin and has a thickness of 15 μm. The insulating layer 3 is made of PC and has a thickness of 250 μm. A coating 4 is provided on the outer side of the insulating layer 3, which is made of a mixture of fluoride and UV-resistant additives and has a thickness of 15 μm.

[0030] Example 3

[0031] The difference between this embodiment and Embodiment 1 is that a high water-resistant metal composite backplate is provided, including a water-resistant layer 1, which is made of copper foil and has a thickness of 60 μm. An insulating layer 3 is bonded to both sides of the water-resistant layer 1 by an adhesive layer 2, which is made of acrylic resin and has a thickness of 30 μm. The insulating layer 3 is made of PPS and has a thickness of 400 μm. A coating 4 is provided on the outer side of the insulating layer 3, which is made of a mixture of fluoride and UV-resistant additives and has a thickness of 30 μm.

[0032] Example 4

[0033] The difference between this embodiment and embodiment 1 is that, specifically, an embossed structure is provided on the side of the insulating layer 3 that contacts the coating 4 near the photovoltaic module body.

[0034] By adopting the above technical solution, the reflection of light on the inner side of the composite backsheet body 5 is increased, thereby effectively improving the power of the photovoltaic module body.

[0035] Example 5

[0036] The difference between this embodiment and embodiment 1 is that, specifically, the composite backplate body 5 is opened according to the battery stacking arrangement, the opening size of the water-blocking layer 1 is 20-50mm, and in this embodiment it is preferably 20mm. The openings of the other layers are less than or equal to the opening size of the water-blocking layer. This ensures that there is a certain distance between the water-blocking layer 1 and the lead wire at the opening, thereby avoiding the risk of leakage.

[0037] When the opening size of other layers is greater than 20mm, a gasket can be added at the opening. The opening of the gasket should be less than 20mm to prevent moisture from entering through the opening, which could cause battery failure or backplate delamination at the opening.

[0038] Example 6

[0039] Please see Figure 2 This utility model provides the following technical solution: A photovoltaic module includes a composite backsheet body 5, a backsheet film 6 connected to one side of the composite backsheet body 5, a solar cell 7 connected to one side of the backsheet film 6, a frontsheet film 8 connected to one side of the solar cell 7, and a frontsheet 9 connected to one side of the frontsheet film 8. The composite backsheet body 5, the backsheet film 6, the solar cell 7, the frontsheet film 8, and the frontsheet 9 are laminated together. Structural frames 10 are connected to both sides of the composite module. The frontsheet 9 is made of a high-transmittance material such as glass or a polymer composite transparent material. In this embodiment, glass is preferred. The backsheet film 6 and the frontsheet film 8 are made of EVA, POE, or PVB materials. In this embodiment, EVA is preferred.

[0040] Specifically, the structural frame 10 is an aluminum alloy frame, a steel frame, a composite frame, or a plastic frame, etc. In this embodiment, an aluminum alloy frame is preferred.

[0041] Specifically, to prevent leakage from the edges of the photovoltaic module body, when using a conductive metal frame, the edges of the laminate need to be insulated before installing the structural frame 10. The specific insulation methods are as follows:

[0042] 1. When making the composite back panel body 5, the side length of the water-blocking layer 1 is 10-80mm smaller than the side length of the other layers, so that the edge of the water-blocking layer 1 is 5-40mm away from the edge of the other layers.

[0043] 2. Use insulating materials to seal the edges of the laminate, such as insulating tape, aluminum foil tape with an outer insulating layer, or insulating adhesive.

[0044] In summary, the water-blocking layer 1 of this invention is made of a low-permeability metal material, which can effectively prevent the intrusion of water vapor. Insulating layers 3 are bonded to both sides of the water-blocking layer 1 with adhesive layers 2, achieving insulation treatment of the water-blocking layer 1 and preventing leakage. This invention also features a functional coating 4, such as a mixture of fluoride and UV-resistant additives, which can increase the weather resistance of the composite backsheet body 5. Different pigments can also be added to diversify the appearance of the composite backsheet body 5 according to the color requirements of the photovoltaic module body. Furthermore, the side of the composite backsheet body 5 closest to the photovoltaic module body where the insulating layer 3 contacts the coating 4 has an embossed structure, increasing the reflection of light on the inner side of the composite backsheet body 5, thereby effectively improving the power of the photovoltaic module body.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high water-resistant metal composite backplate, characterized in that: It includes a water-blocking layer, and an insulating layer is bonded to both sides of the water-blocking layer by an adhesive layer. The outer side of the insulating layer is provided with a coating.

2. The high water-resistant metal composite backplate according to claim 1, characterized in that: The material of the water-blocking layer includes, but is not limited to, aluminum foil, tin foil, or copper foil.

3. The high water-resistant metal composite backplate according to claim 1, characterized in that: The thickness of the water-blocking layer is 5um-60um.

4. The high water-resistant metal composite backplate according to claim 1, characterized in that: The insulating layer is made of, but is not limited to, one of PET, PBT, PC, PA, PMMA, PPS, PO, polyurethane, or resin.

5. The high water-resistant metal composite backplate according to claim 1, characterized in that: The thickness of the insulating layer is 50um-400um.

6. The high water-resistant metal composite backplate according to claim 1, characterized in that: An embossed structure is provided on the side of the insulation layer that contacts the coating near the photovoltaic module body.

7. The high water-resistant metal composite backplate according to claim 1, characterized in that: The adhesive layer is made of, but is not limited to, one of polyurethane, epoxy resin or acrylic resin.

8. The high water-resistant metal composite backplate according to claim 1, characterized in that: The thickness of the adhesive layer is 5um-30um.

9. The high water-resistant metal composite backplate according to claim 1, characterized in that: The coating is a mixture of fluoride and UV-resistant additives, and the coating thickness is 5µm-30µm.

10. A photovoltaic module, characterized in that: The high water-resistant metal composite backsheet as described in any one of claims 1 to 9 is provided. A rear panel adhesive film is connected to one side of the high water-resistant metal composite backsheet, a battery cell is connected to one side of the rear panel adhesive film, a front panel adhesive film is connected to one side of the battery cell, and a front panel is connected to one side of the front panel adhesive film. Structural frames are connected to both sides of the high water-resistant metal composite backsheet, the rear panel adhesive film, the battery cell, the front panel adhesive film, and the front panel.

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