Black photovoltaic module reflective film

Abstract

The utility model discloses a black photovoltaic module reflective film which is used for shielding a welding strip between battery pieces. The reflective film is attached between the battery pieces corresponding to the solder strips; the reflective film comprises a black coating, a base material layer, a white reflective layer, a black infrared transmitting layer and a high-molecular elastomer layer which are sequentially arranged from top to bottom, and the high-molecular elastomer layer is attached to the battery piece. The black photovoltaic module reflective film provided by the utility model has infrared transmission capability while shielding the welding strip between the battery pieces, has excellent temperature resistance and insulation performance, and can improve the power generation power of the photovoltaic module.

Description

Technical Field

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

[0002] Photovoltaic modules include a front panel, cells, a back panel, and an encapsulation film. The cells are connected in series via welding ribbons. To achieve aesthetic appeal, photovoltaic modules, especially black ones, usually use shading strips to shield the welding ribbons between cells and exposed bus bars, so that they have the same color as other battery parts.

[0003] In existing technology, black polyimide film is often used to shield the soldering ribbons between cells. However, the addition of carbon black to black polyimide film significantly reduces its insulation performance. Furthermore, this black film completely absorbs light, which can easily cause the cell temperature to rise, reducing power generation efficiency and lowering light utilization. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a black photovoltaic module reflective film, which not only blocks the welding strips between the battery cells, but also has infrared transmittance, and has excellent temperature resistance and insulation performance, which can improve the power generation capacity of the photovoltaic module.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A black photovoltaic module reflective film is used to shield the welding strips between solar cells. The reflective film is attached between the solar cells at the corresponding welding strip positions. The reflective film includes a black coating layer, a base material layer, a white reflective layer, a black infrared transmission layer, and a polymer elastomer layer arranged in sequence from top to bottom. The polymer elastomer layer is attached to the solar cells.

[0007] Furthermore, the substrate layer is a polyimide substrate layer or a polyethylene terephthalate substrate layer.

[0008] Furthermore, the white reflective layer is a white paint layer added with reflective fillers.

[0009] Furthermore, the white reflective layer is one of an acrylic white paint layer, a polyurethane white paint layer, a fluorocarbon white paint layer, a polyester white paint layer, and a silicone white paint layer.

[0010] Furthermore, the transmittance of the black infrared transmission layer in the infrared band of 700-1200 nm is greater than 20%.

[0011] Furthermore, the black infrared transmitting layer is a black paint layer containing a black infrared transmitting organic pigment.

[0012] 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.

[0013] Furthermore, the black coating layer is a black paint layer added with black filler or infrared-transmitting organic pigment.

[0014] Furthermore, 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-acrylate copolymer elastomer layer, an ethylene-vinyl acetate copolymer elastomer layer, and an ethylene-α-olefin copolymer elastomer layer.

[0015] Furthermore, the thickness of the substrate layer is 10-200 μm, the thickness of the black coating layer is 1-20 μm, the thickness of the white reflective layer is 1-30 μm, the thickness of the black infrared transmission layer is 1-20 μm, and the thickness of the polymer elastomer layer is 10-150 μm.

[0016] Beneficial effects of the utility model:

[0017] The black photovoltaic module reflective film of the present invention comprises, from top to bottom, a black coating layer, a base layer, a white reflective layer, a black infrared-transmitting layer, and a polymer elastomer layer. The black infrared-transmitting layer has infrared transmission capabilities and, in conjunction with the white reflective layer, shields the soldering ribbon while allowing the solar cells to absorb reflected infrared light, thereby improving light utilization. Furthermore, the black infrared-transmitting layer in the black photovoltaic module reflective film of the present invention, located close to the solar cells, does not cause a temperature increase, as it partially transmits infrared light, compared to fully light-blocking black polymer films. Furthermore, the black infrared-transmitting layer in the black photovoltaic module reflective film of the present invention, located close to the solar cells, exhibits superior insulation properties compared to prior art black polyimide films containing carbon black. The black coating layer is placed at the bottom layer of the reflective film, which not only does not affect the power generation efficiency of the solar cells and the utilization of infrared light, but also works in conjunction with the black infrared-transmitting layer to better shield the soldering ribbon. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 This is a schematic structural diagram of the cooperation between the black photovoltaic module light-shielding film and the welding ribbon in the photovoltaic module of the present invention.

[0020] In the figure, 10: black photovoltaic module reflective film, 101: black coating, 102: base material layer, 103: white reflective layer, 104: black infrared transmission layer, 105: polymer elastomer layer; 20: front plate; 30: battery cell; 40: welding ribbon. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] like Figure 1 A black photovoltaic module reflective film 10 is shown, which is used to shield the welding ribbons 40 between the cells 30. The reflective film is attached between the cells corresponding to the welding ribbon positions, specifically, attached to the side of the cell away from the front plate of the photovoltaic module; the reflective film includes a black coating 101, a base material layer 102, a white reflective layer 103, a black infrared transparent layer 104, and a polymer elastomer layer 105, which are arranged in sequence from top to bottom; the polymer elastomer layer 105 is attached to the cell 30.

[0024] The substrate layer 102 is a polyimide substrate layer or a polyethylene terephthalate substrate layer.

[0025] The white reflective layer 103 is a white paint layer containing a reflective filler. Preferably, the white reflective layer is one of an acrylic white paint layer, a polyurethane white paint layer, a fluorocarbon white paint layer, a polyester white paint layer, and a silicone white paint layer. The reflective filler is selected from one or more of titanium dioxide, talc, calcium carbonate, magnesium carbonate, and barium sulfate.

[0026] The black infrared-transmitting layer 104 has a transmittance greater than 20% in the infrared band of 700-1200 nm. The black infrared-transmitting layer 104 is a black paint layer containing a black infrared-transmitting organic pigment. The black infrared-transmitting organic pigment is selected from one or more of perylene, phthalocyanine, condensed ring ketone, azo, dioxazine, and heterocyclic organic pigments. The black infrared-transmitting layer 104 is preferably selected from 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.

[0027] The black coating 101 is a black paint layer containing a black filler or an infrared-transmitting organic pigment. The black paint layer 101 is preferably an acrylic paint layer, a polyurethane paint layer, a fluorocarbon paint layer, a polyester paint layer, or a silicone paint layer. The black filler is preferably one or more of carbon black, graphite, and ink.

[0028] The polymer elastomer layer 105 is one of a thermoplastic polyurethane elastomer layer, a SEBS thermoplastic elastomer layer, an ethylene-acrylic acid copolymer elastomer layer, an ethylene-acrylate copolymer elastomer layer, an ethylene-vinyl acetate copolymer elastomer layer, and an ethylene-α-olefin copolymer elastomer layer.

[0029] The thickness of the substrate layer 102 is 10-200 μm, the thickness of the black coating layer 101 is 1-20 μm, the thickness of the white reflective layer 103 is 1-30 μm, the thickness of the black infrared transmission layer 104 is 1-20 μm, and the thickness of the polymer elastomer layer 105 is 10-150 μm.

[0030] Example 1

[0031] like Figure 1 As shown, the black photovoltaic module reflective film is used to block the welding strips between the cells. The reflective film is attached between the cells at the corresponding welding strip positions; the reflective film includes a black coating 101, a base material layer 102, a white reflective layer 103, a black infrared transmission layer 104, and a polymer elastomer layer 105 arranged in sequence from top to bottom; the polymer elastomer layer 105 is attached to the cell 30.

[0032] The substrate layer 102 is a polyimide substrate layer.

[0033] The white reflective layer 103 is a white paint layer with a reflective filler added. In this embodiment 1, the white reflective layer 103 is an acrylic white paint layer; and the reflective filler is titanium dioxide.

[0034] The black infrared-transmitting layer 104 has a transmittance greater than 20% in the infrared wavelength range of 700-1200 nm. The black infrared-transmitting layer 104 is a black paint layer containing a black infrared-transmitting organic pigment. In this embodiment 1, the black infrared-transmitting organic pigment is a phthalocyanine organic pigment; the black infrared-transmitting layer 104 is an acrylic black paint layer.

[0035] In this embodiment 1, the black coating 101 is an acrylic paint layer added with a black filler; the black filler is carbon black.

[0036] In this embodiment 1, the polymer elastomer layer 105 is a thermoplastic polyurethane elastomer layer.

[0037] In this embodiment 1, the thickness of the base material layer 102 is 50 μm, the thickness of the black coating layer 101 is 5 μm, the thickness of the white reflective layer 103 is 10 μm, the thickness of the black infrared transmission layer 104 is 10 μm, and the thickness of the polymer elastomer layer 105 is 30 μm.

[0038] Example 2

[0039] like Figure 1 As shown, the black photovoltaic module reflective film is used to block the welding strips between the cells. The reflective film is attached between the cells at the corresponding welding strip positions; the reflective film includes a black coating 101, a base material layer 102, a white reflective layer 103, a black infrared transmission layer 104, and a polymer elastomer layer 105 arranged in sequence from top to bottom; the polymer elastomer layer 105 is attached to the cell 30.

[0040] In the second embodiment, the substrate layer 102 is a polyimide substrate layer.

[0041] In this embodiment 2, the white reflective layer 103 is a polyurethane white paint layer added with a reflective filler; the reflective filler is titanium dioxide.

[0042] The black infrared-transmitting layer 104 has a transmittance greater than 20% in the infrared wavelength range of 700-1200 nm. The black infrared-transmitting layer 104 is a black paint layer containing a black infrared-transmitting organic pigment. In this embodiment 2, the black infrared-transmitting organic pigment is a heterocyclic organic pigment; the black infrared-transmitting layer 104 is a polyurethane black paint layer.

[0043] In this embodiment 2, the black coating 101 is an acrylic paint layer added with a black filler; the black filler is carbon black.

[0044] In this embodiment 2, the polymer elastomer layer 105 is a thermoplastic polyurethane elastomer layer.

[0045] In this embodiment 2, the thickness of the base material layer 102 is 60 μm, the thickness of the black coating layer 101 is 8 μm, the thickness of the white reflective layer 103 is 8 μm, the thickness of the black infrared transmission layer 104 is 12 μm, and the thickness of the polymer elastomer layer 105 is 20 μm.

[0046] like Figure 2As shown, when in use, the black photovoltaic module reflective film 10 of the present invention is first attached between two battery cells 30, with the polymer elastomer layer 105 therein in contact with the battery cells 30, and then the welding ribbon 40 is welded between the battery cells 30; viewed from the front, the black photovoltaic module reflective film 10 blocks the welding ribbon 40; when light passes through the front plate 20 and is incident on the black photovoltaic module reflective film 10, the infrared light passes through the black infrared transparent layer 104 and is reflected by the white reflective layer 103. The reflected infrared light can be absorbed by the battery cells 30, thereby improving the utilization rate of light.

[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 reflective film, characterized in that: Used to shield the welding strips between battery cells, the reflective film is attached between the battery cells at the corresponding welding strip positions; the reflective film includes a black coating layer, a base material layer, a white reflective layer, a black infrared transmission layer, and a polymer elastomer layer arranged in sequence from top to bottom; the polymer elastomer layer is attached to the battery cells.

2. The black photovoltaic module reflective film according to claim 1, characterized in that: The substrate layer is a polyimide substrate layer or a polyethylene terephthalate substrate layer.

3. The black photovoltaic module reflective film according to claim 1, characterized in that: The white reflective layer is a white paint layer added with reflective fillers.

4. The black photovoltaic module reflective film according to claim 3, characterized in that: The white reflective layer is one of an acrylic white paint layer, a polyurethane white paint layer, a fluorocarbon white paint layer, a polyester white paint layer, and a silicone white paint layer.

5. The black photovoltaic module reflective 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%.

6. The black photovoltaic module reflective 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.

7. The black photovoltaic module reflective film according to claim 6, 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.

8. The black photovoltaic module reflective film according to claim 1, characterized in that: The black coating layer is a black paint layer added with black filler or infrared-transmitting organic pigment.

9. The black photovoltaic module reflective film according to claim 1, characterized in that: 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-acrylate copolymer elastomer layer, an ethylene-vinyl acetate copolymer elastomer layer, and an ethylene-α-olefin copolymer elastomer layer.

10. The black photovoltaic module reflective film according to claim 1, characterized in that: The thickness of the substrate layer is 10-200 μm, the thickness of the black coating layer is 1-20 μm, the thickness of the white reflective layer is 1-30 μm, the thickness of the black infrared transmission layer is 1-20 μm, and the thickness of the polymer elastomer layer is 10-150 μm.

Images