Black photovoltaic module shading film

Abstract

The utility model discloses a black photovoltaic module shading film, which is used for shading a welding strip or a bus bar and is attached to one side of the bus bar close to a front plate of a photovoltaic module or a part between battery pieces capable of shading the welding strip. The shading film comprises a transparent base material layer and black infrared transmitting layers distributed on the two sides of the transparent base material layer. While shielding a bus bar or a welding strip, the photovoltaic module shielding film also has infrared transmission capability, has relatively excellent temperature resistance and insulation performance, and can improve the power generation power of a photovoltaic module.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a black photovoltaic component light-shielding film. Background Art

[0002] Photovoltaic modules include a front panel, solar cells, a back panel, and an encapsulation film. Both sides of the solar cells are equipped with welding ribbons and bus bars, which are used to fix the circuits. In order to achieve aesthetic requirements, photovoltaic modules, especially black photovoltaic modules, usually use shading strips to cover the welding ribbons between the solar cells and the exposed bus bars, so that they have the same color as other battery parts.

[0003] With technological advancements, the welding and layout of photovoltaic modules are now almost entirely performed by machines, including the placement of solder ribbons and busbar shielding strips. During the placement process, because it is difficult for cell strings to be perfectly aligned, there will be some displacement, front to back, left to right, and right to left. This means that when shielding the busbars or solder ribbons, the shielding strips may block some cells.

[0004] In existing technology, black multi-layer polymer films are often used for shielding. Since black polymer films completely block light between 380 and 1200 nm, when shielding strips are used, partial shading of the cells can occur, resulting in a decrease in the power generation of the photovoltaic module. Furthermore, the addition of carbon black to existing black shielding films significantly reduces their insulation properties. Furthermore, these black films completely absorb light, which increases the temperature of the cells and reduces power generation efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a black photovoltaic module shading film, which not only blocks the busbars or welding strips, but also has infrared transmittance, and has excellent temperature resistance and insulation performance, which can improve the power generation capacity of the photovoltaic module.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] A black photovoltaic module light-shielding film is used to shield welding strips or bus bars. The light-shielding film is attached to the side of the bus bar close to the front plate of the photovoltaic module, or to the part between the battery cells that can shield the welding strips. The light-shielding film includes a transparent substrate layer and a black infrared transmission layer distributed on both sides of the transparent substrate layer.

[0008] Furthermore, the transmittance of the black infrared transmission layer in the infrared band of 700-1200 nm is greater than 20%.

[0009] Furthermore, the transparent substrate layer is one of a polypropylene substrate layer, a polyethylene terephthalate substrate layer, a polyethylene naphthalate substrate layer, a polybutylene terephthalate substrate layer, and a transparent nylon substrate layer.

[0010] Furthermore, the black infrared transparent layer is a black coating layer containing a black infrared transparent organic pigment selected from one or more of perylene, phthalocyanine, condensed ring ketone, azo, dioxazine, and heterocyclic organic pigments.

[0011] Furthermore, the black infrared transmission layer is one of an acrylic black paint layer, a polyurethane black paint layer, a fluorocarbon black paint layer, a polyester black paint layer, and a silicone black paint layer.

[0012] Furthermore, a polymer elastomer layer is provided on the outer side of the black infrared transmitting layer on either side, and the polymer elastomer layer is one of a thermoplastic polyurethane elastomer layer, a SEBS thermoplastic elastomer layer, an ethylene-acrylic acid copolymer elastomer layer, an ethylene-acrylic ester copolymer elastomer layer, an ethylene-vinyl acetate copolymer elastomer layer, and an ethylene-α-olefin copolymer elastomer layer.

[0013] Furthermore, the transparent substrate layer has a thickness of 10-200 μm.

[0014] Furthermore, the thickness of the black infrared transmission layer is 1-20 μm.

[0015] Furthermore, the thickness of the polymer elastomer layer is 10-150 μm.

[0016] Beneficial effects of the utility model:

[0017] The black photovoltaic module light-shielding film of the present invention includes a transparent substrate layer and a black infrared-transmitting layer distributed on both sides of the transparent substrate layer. The black infrared-transmitting layer has infrared transmittance and, in conjunction with the transparent substrate layer, can block the busbars or welding strips while also allowing the cells to absorb infrared light, thereby increasing the power generation of the photovoltaic module and reducing the problem of reduced photovoltaic module power generation efficiency caused by partial cell blocking due to typesetting, etc. Furthermore, the black photovoltaic module light-shielding film of the present invention also has relatively excellent temperature resistance and insulation properties. Compared with the fully light-shielding black polymer film, the black photovoltaic module light-shielding film of the present invention does not cause a temperature increase due to partial infrared transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the black photovoltaic module shading film of Example 1 of the present utility model.

[0019] Figure 2This is a schematic structural diagram of the black photovoltaic module shading film of Example 2 of the present utility model.

[0020] Figure 3 This is a structural diagram of the cooperation between the black photovoltaic module shading film and the bus bar in the photovoltaic module in Example 1 of the present utility model.

[0021] In the figure, 10: black photovoltaic module shading film; 101: transparent substrate layer, 102: black infrared transmission layer, 103: polymer elastomer layer; 20: battery cell; 30: bus bar. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", etc., 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, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figure 1 and Figure 2 A black photovoltaic module shading film 10 is shown, which is used to shield welding strips or bus bars. The shading film is attached to the side of the bus bar close to the front panel of the photovoltaic module, or to the part between the battery cells that can shield the welding strips; the shading film includes a transparent substrate layer 101 and a black infrared transparent layer 102 distributed on both sides of the transparent substrate layer 101.

[0025] The transmittance of the black infrared transmission layer 102 in the infrared band of 700-1200 nm is greater than 20%.

[0026] The transparent substrate layer 101 is one of a polypropylene substrate layer, a polyethylene terephthalate substrate layer, a polyethylene naphthalate substrate layer, a polybutylene terephthalate substrate layer, and a transparent nylon substrate layer.

[0027] The black infrared transmitting layer 102 is a black coating layer containing a black infrared transmitting organic pigment selected from one or more of perylene, phthalocyanine, condensed ring ketone, azo, dioxazine, and heterocyclic organic pigments.

[0028] The black infrared transmission layer 102 is one of an acrylic black paint layer, a polyurethane black paint layer, a fluorocarbon black paint layer, a polyester black paint layer, and a silicone black paint layer.

[0029] Among them, a polymer elastomer layer 103 is also provided on the outside of the black infrared transparent layer 102 on either side, and the polymer elastomer layer 103 is one of a thermoplastic polyurethane elastomer layer, a SEBS thermoplastic elastomer layer, an ethylene-acrylic acid copolymer elastomer layer, an ethylene-acrylic ester copolymer elastomer layer, an ethylene-vinyl acetate copolymer elastomer layer, and an ethylene-α-olefin copolymer elastomer layer.

[0030] The thickness of the transparent substrate layer 101 is 10-200 μm; the thickness of the black infrared transmission layer 102 is 1-20 μm; and the thickness of the polymer elastomer layer 103 is 10-150 μm.

[0031] Example 1

[0032] like Figure 1 A black photovoltaic module shading film 10 is shown, which is used to shield welding strips or bus bars. The shading film is attached to the side of the bus bar close to the front panel of the photovoltaic module, or to the part between the battery cells that can shield the welding strips; the shading film includes a transparent substrate layer 101 and a black infrared transparent layer 102 distributed on both sides of the transparent substrate layer 101.

[0033] The transmittance of the black infrared transmission layer 102 in the infrared band of 700-1200 nm is greater than 20%.

[0034] The transparent substrate layer 101 is a polypropylene substrate layer.

[0035] The black infrared transmission layer 102 is a black coating layer containing a black infrared transmission organic pigment selected from perylene-based organic pigments.

[0036] The black infrared transmission layer 102 is an acrylic black paint layer.

[0037] The thickness of the transparent substrate layer 101 is 50 μm; the thickness of the black infrared transmission layer 102 is 10 μm.

[0038] Example 2

[0039] like Figure 2A black photovoltaic module shading film 10 is shown, which is used to shield welding strips or bus bars. The shading film is attached to the side of the bus bar close to the front plate of the photovoltaic module, or to the part between the battery cells that can shield the welding strips; the shading film includes a transparent substrate layer 101, a black infrared transparent layer 102 distributed on both sides of the transparent substrate layer 101, and a polymer elastomer layer 103 located on the outside of the black infrared transparent layer 102 on any one side.

[0040] The transmittance of the black infrared transmission layer 102 in the infrared band of 700-1200 nm is greater than 20%.

[0041] The transparent substrate layer 101 is a polypropylene substrate layer.

[0042] The black infrared transmission layer 102 is a black coating layer containing a black infrared transmission organic pigment selected from perylene-based organic pigments.

[0043] The black infrared transmission layer 102 is an acrylic black paint layer.

[0044] The polymer elastomer layer 103 is a thermoplastic polyurethane elastomer layer.

[0045] The thickness of the transparent substrate layer 101 is 30 μm; the thickness of the black infrared transmission layer 102 is 15 μm; and the thickness of the polymer elastomer layer 103 is 20 μm.

[0046] like Figure 3 As shown, when in use, the black photovoltaic module shading film 10 of Example 1 is adhered to the side of the busbar 30 close to the front plate in the photovoltaic module by tape or the packaging film in the photovoltaic module to block the busbar 30; when light passes through the front plate and is incident on the black photovoltaic module shading film 10, the infrared light can reach the battery cell 20 after passing through the shading film area blocking the battery cell 20, and the infrared light passing through the shading film area blocking the busbar 30 can be reflected by the busbar, and then penetrate the shading film and can be partially absorbed by the battery cell 20, thereby improving the power generation efficiency of the photovoltaic module.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A black photovoltaic module shading film, characterized in that: Used to shield welding strips or bus bars, the shading film is attached to the side of the bus bar close to the front plate of the photovoltaic module, or to the part between the battery cells that can shield the welding strips; the shading film includes a transparent substrate layer and a black infrared transparent layer distributed on both sides of the transparent substrate layer.

2. The black photovoltaic module shading film according to claim 1, characterized in that: The transmittance of the black infrared transmission layer in the infrared band of 700-1200nm is greater than 20%.

3. The black photovoltaic module light-shielding film according to claim 1, characterized in that: The transparent substrate layer is one of a polypropylene substrate layer, a polyethylene terephthalate substrate layer, a polyethylene naphthalate substrate layer, a polybutylene terephthalate substrate layer, and a transparent nylon substrate layer.

4. The black photovoltaic module shading film according to claim 1, characterized in that: The black infrared transmission layer is a black paint layer containing a black infrared transmission organic pigment.

5. The black photovoltaic module light-shielding film according to claim 1, characterized in that: The black infrared transmission layer is one of an acrylic black paint layer, a polyurethane black paint layer, a fluorocarbon black paint layer, a polyester black paint layer, and a silicone black paint layer.

6. The black photovoltaic module light-shielding film according to claim 1, characterized in that: A polymer elastic layer is provided on the outer side of the black infrared transmission layer on either side.

7. The black photovoltaic module light-shielding film according to claim 1, characterized in that: The thickness of the transparent substrate layer is 10-200 μm.

8. The black photovoltaic module light-shielding film according to claim 1, characterized in that: The thickness of the black infrared transmission layer is 1-20 μm.

9. The black photovoltaic module light-shielding film according to claim 6, characterized in that: The thickness of the polymer elastic layer is 10-150 μm.

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