Near-infrared high-reflection black solar photovoltaic backboard and photovoltaic module

Abstract

The utility model aims to disclose a near-infrared high-reflection black solar photovoltaic backboard and a photovoltaic assembly, which relate to the technical field of photovoltaic cells and consist of a black coating, a near-infrared high-reflection PET (polyethylene terephthalate) layer, a bonding layer and a weather-proof PET layer which are sequentially laminated, the thickness of the black coating ranges from 5 micrometers to 15 micrometers. The thickness of the near-infrared high-reflection PET layer ranges from 100 micrometers to 200 micrometers, the near-infrared light reflectivity of the near-infrared high-reflection PET layer is larger than 90%, and the bonding layer is a polyurethane layer or an acrylic resin layer or an epoxy resin layer. When being used for distributed household photovoltaic, local absorption and photovoltaic building integration, the photovoltaic module is more attractive; the near-infrared high-reflection layer has high reflectivity on light in a near-infrared band, the near-infrared light reflectivity is larger than 90%, the near-infrared light reflectivity of the black back plate can be larger than 90%, and therefore the sunlight utilization efficiency of the solar cell is improved, and the power generation power of the solar cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a near-infrared high-reflection black solar photovoltaic backboard and a photovoltaic module. Background Art

[0002] Solar energy is a safe, clean and renewable energy source. Photovoltaic modules convert solar radiation into usable electrical energy through the photovoltaic effect of semiconductor materials, which can effectively solve the important problem of energy shortage.

[0003] The appearance of solar photovoltaic modules must be beautiful and also meet the design requirements of modern buildings.

[0004] At present, solar cells are mainly crystalline silicon cells, and their response bands to sunlight are mainly concentrated in the visible light and near-infrared light bands (380-1100nm). Improving the utilization efficiency of light waves in this band is beneficial to the photoelectric conversion of crystalline silicon cells. The light between the cells in the solar photovoltaic module is reflected by the solar photovoltaic backplane or film. The higher the light reflection efficiency, the more beneficial it is to the photoelectric conversion of the gain crystalline silicon cell. At present, the reflectivity of the conventional near-infrared high-reflection black backplane on the market to near-infrared light is about 60%, which is still insufficient and affects the power generation efficiency of solar cells.

[0005] In order to solve these problems, it is necessary to propose a new type of near-infrared high-reflection black solar photovoltaic backplane and photovoltaic module. Summary of the invention

[0006] The utility model aims to disclose a near-infrared highly reflective black solar photovoltaic back panel and photovoltaic module, wherein the photovoltaic back panel is designed to be black and its reflectivity to near-infrared light exceeds 90%, thereby improving the power generation efficiency of solar cells.

[0007] The first invention objective of the utility model is to provide a near-infrared highly reflective black solar photovoltaic back panel.

[0008] The second invention objective of the utility model is to provide a photovoltaic module.

[0009] In order to achieve the above first invention purpose, the utility model provides a near-infrared high-reflection black solar photovoltaic backsheet, which is composed of a black coating, a near-infrared high-reflection PET layer, a bonding layer and a weather-resistant PET layer stacked in sequence;

[0010] The thickness of the black coating is 5 μm to 15 μm;

[0011] The thickness of the near-infrared high-reflection PET layer is 100 μm to 200 μm, and the near-infrared light reflectivity of the near-infrared high-reflection PET layer is greater than 90%.

[0012] Preferably, the bonding layer is a polyurethane layer, an acrylic resin layer or an epoxy resin layer.

[0013] Preferably, the adhesive layer has a thickness of 3 μm to 15 μm.

[0014] Preferably, the weather-resistant PET layer is a weather-resistant PET film.

[0015] Preferably, the weather-resistant PET layer has a thickness of 50 μm to 200 μm.

[0016] Preferably, the black coating has a thickness of 5 μm to 10 μm.

[0017] Preferably, the adhesive layer has a thickness of 3 μm to 10 μm.

[0018] Preferably, the black coating is one of a polyurethane layer, an acrylic resin layer, and an epoxy resin layer containing a black pigment or a pigment that appears black after mixing.

[0019] Based on the same inventive principle, in order to achieve the above-mentioned second inventive purpose, the utility model provides a photovoltaic assembly, including glass, a first packaging film, a solar cell, a second packaging film and the near-infrared high-reflection black solar photovoltaic backplane described in the first invention, which are arranged in sequence, and the second packaging film contacts the black coating of the near-infrared high-reflection black solar photovoltaic backplane described in the first invention.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The photovoltaic backplane of the utility model has a black coating and a near-infrared high-reflection PET layer. The black coating can absorb most of the visible light, so the backplane is black, which is more beautiful when used for distributed household photovoltaics, on-site consumption and photovoltaic building integration (BIPV); the near-infrared high-reflection layer has high reflectivity to light in the near-infrared band, and the near-infrared light reflectivity is greater than 90%, which can make the near-infrared reflectivity of the black backplane greater than 90%, thereby enhancing the efficiency of solar cells in utilizing sunlight and improving the power generation power of solar cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the near-infrared high-reflection black solar photovoltaic back panel of the utility model.

[0023] Figure 2 It is a cross-sectional view of the photovoltaic module of the utility model.

[0024] Among them, 1. black coating; 2. near-infrared high-reflection PET layer; 3. adhesive layer; 4. weather-resistant PET layer; 5. glass; 6. first packaging film; 7. solar cell; 8. second packaging film; 9. photovoltaic backplane. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] Embodiment 1

[0028] See also Figure 1 As shown, the utility model provides a near-infrared high-reflection black solar photovoltaic backplane, which consists of a black coating 1, a near-infrared high-reflection PET layer 2, an adhesive layer 3 and a weather-resistant PET layer 4 stacked in sequence; the black coating 1 has a thickness of 5μm to 15μm, and the black coating 2 has a thickness of preferably 5μm to 10μm, such as 5μm, 8μm or 10μm; the near-infrared high-reflection PET layer 2 has a thickness of 100μm to 200μm, and the near-infrared light reflectivity of the near-infrared high-reflection PET layer 2 is greater than 90%.

[0029] Specifically, the black coating 1 can absorb most of the visible light. The black coating 1 makes the photovoltaic backplane black, which is more beautiful when used for distributed household photovoltaics, on-site consumption and photovoltaic building integration (BIPV). The black coating 1 is one of a polyurethane layer, an acrylic resin layer, and an epoxy resin layer containing black pigment or a pigment that is black after mixing, that is, the black coating 1 is one of a black polyurethane layer, an acrylic resin layer, and an epoxy resin layer. The black coating includes the following raw materials in parts by weight: 40-70 parts of a main resin, 5-25 parts of a pigment, 2-20 parts of an auxiliary agent, and 2-20 parts of a curing agent. The main resin is one or more of a polyurethane resin, an acrylic resin, an epoxy resin, etc. The pigment is one or more of carbon black, iron oxide black, copper chrome black, iron chrome black, cobalt black, and aniline black. The pigment can also be a mixed pigment of carbon black, iron oxide black, copper chrome black, iron chrome black, cobalt black, aniline black, antimony sulfide, chrome yellow, molybdenum chrome red, chrome green, ultramarine, perylene green, perylene red, titanium green, titanium blue, phthalocyanine blue, phthalocyanine green, permanent yellow, benzidine yellow, fast yellow, permanent red, toluidine red, quinacridone violet, and permanent violet that are mixed and present a black color. The auxiliary agent is one or more of a dispersant, a light conversion agent, an antioxidant, a light stabilizer, a catalyst, a flame retardant, a defoaming agent, and a leveling agent. The curing agent is one or more of an isocyanate curing agent, an amine curing agent, and a dicyandiamide curing agent. The near-infrared high-reflection PET layer 2 is a PET film with high reflectivity to light in the near-infrared band, and its near-infrared light reflectivity is greater than 90%, which can make the near-infrared reflectivity of the black backplane greater than 90%. Through this embodiment, the photovoltaic backplane can not only meet the requirements of distributed household photovoltaics, on-site consumption and photovoltaic building integration for appearance aesthetics, but also improve the near-infrared light reflectivity, thereby enhancing the efficiency of solar cells in utilizing sunlight and increasing the power generation capacity of solar cells.

[0030] In a preferred embodiment, the bonding layer 3 is a polyurethane layer, an acrylic resin layer or an epoxy resin layer. The bonding layer 3 can ensure that there is no obvious boundary between the layers, and stratification is not easy to occur, which is beneficial to improving the service life of the photovoltaic module. In addition, the production process is simple, the production efficiency is high, and it helps to save costs. The thickness of the bonding layer 3 is 3μm to 15μm, and the thickness of the bonding layer 3 is preferably 3μm to 10μm, such as 5μm, 8μm, and 10μm.

[0031] In a preferred embodiment, the weather-resistant PET layer 4 is a weather-resistant PET film, and the thickness of the weather-resistant PET layer 4 is 50μm to 200μm, such as 50μm, 80μm, 100μm, 150μm, 170μm and 200μm. The weather-resistant PET film can not only enhance the weather resistance of the backplane, but also help to improve the mechanical properties of the backplane, so that the black photovoltaic backplane enhances the protection of silicon wafer cells.

[0032] Embodiment 2

[0033] Photovoltaic modules, see Figure 2 , comprising glass 5, a first packaging film 6, a solar cell 7, a second packaging film 8 and the near-infrared high-reflection black solar photovoltaic backboard 9 described in Example 1, which are arranged in sequence, and the second packaging film 8 contacts the black coating 1 of the near-infrared high-reflection black solar photovoltaic backboard 9 described in Example 1.

[0034] Specifically, when photovoltaic modules are used for distributed household photovoltaics, local consumption and photovoltaic building integration (BIPV), in addition to generating electricity on the front side of the photovoltaic modules, the back side can also generate electricity by receiving reflected light from the ground or the surface of the building. After using the near-infrared high-reflectivity black solar photovoltaic backboard described in Example 1, the black photovoltaic backboard can not only meet the requirements of distributed household photovoltaics, local consumption and photovoltaic building integration for appearance aesthetics, but also improve the near-infrared light reflectivity, thereby enhancing the efficiency of solar cells in utilizing sunlight and improving the power generation of solar cells.

[0035] The photovoltaic assembly disclosed in this embodiment has the same technical solutions as those in the first embodiment. Please refer to the description in the first embodiment and will not be repeated here.

Claims

1. Near-infrared high-reflection black solar photovoltaic backsheet, characterized in that: It consists of a black coating, a near-infrared high-reflection PET layer, a bonding layer and a weather-resistant PET layer stacked in sequence; The thickness of the black coating is 5 μm to 15 μm; The thickness of the near-infrared high-reflection PET layer is 100 μm to 200 μm, and the near-infrared light reflectivity of the near-infrared high-reflection PET layer is greater than 90%.

2. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 1, characterized in that: The bonding layer is a polyurethane layer, an acrylic resin layer or an epoxy resin layer.

3. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 2, characterized in that: The thickness of the bonding layer is 3 μm to 15 μm.

4. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 1, characterized in that: The weather-resistant PET layer is a weather-resistant PET film.

5. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 4, characterized in that: The thickness of the weather-resistant PET layer is 50 μm to 200 μm.

6. The near-infrared high-reflection black solar photovoltaic backsheet according to any one of claims 1 to 4, characterized in that: The thickness of the black coating is 5 μm to 10 μm.

7. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 3, characterized in that: The thickness of the bonding layer is 3 μm to 10 μm.

8. The near-infrared high-reflection black solar photovoltaic backsheet according to claim 6, characterized in that: The black coating is one of a polyurethane layer, an acrylic resin layer, and an epoxy resin layer containing a black pigment or a pigment that is black after mixing.

9. A photovoltaic module, characterized in that It comprises glass, a first packaging film, a solar cell, a second packaging film and a near-infrared high-reflection black solar photovoltaic back panel as described in any one of claims 1-8, which are arranged in sequence, and the second packaging film contacts the black coating of the near-infrared high-reflection black solar photovoltaic back panel as described in any one of claims 1-8.

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