Photovoltaic segmented reflection gap film

Abstract

The utility model provides a photovoltaic segmented reflection gap film, the gap film from bottom to top comprises an EVA layer, a PET base film layer and a reflective microstructure layer in order, the reflective microstructure layer comprises a plurality of reflective microstructure segments arranged at intervals, the cross section of each reflective microstructure segment is a plurality of continuously arranged triangular prism structures, and the vertex angle of each triangular prism deviates from the EVA layer. According to the photovoltaic segmented reflection gap film, the reflection microstructure layer comprises a plurality of reflection microstructure segments arranged at intervals, short circuit caused by the fact that the reflection gap film is communicated with anodes and cathodes of adjacent battery strings is prevented, and the structural design avoids local short circuit of an assembly caused by the reflection gap film under the condition that the actual effect of the reflection gap film is not affected. The consumption of metal aluminum of the reflective microstructure coating can be further reduced, and the environmental pressure is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic component manufacturing, and in particular relates to a segmented reflection gap film for photovoltaics. Background Art

[0002] The glass used on the back of the bifacial photovoltaic module is printed with ink on the glass surface through the silk screen process to form a white grid. The white grid is set at the cell gap. The sunlight incident from the front can be reflected again at the white grid in the cell gap, increasing the incident effect of sunlight and improving the conversion efficiency of the photovoltaic module. However, with the continuous advancement of cost reduction and efficiency improvement in the photovoltaic industry, photovoltaic glass has become thinner, and the problem of silk screen technology affecting glass strength has gradually become prominent. Since the strength of the glass will decrease at the silk screen printing, the current glass cost reduction and thinning has reached its limit, and the use of silk screen technology will not meet the glass strength requirements. Therefore, the traditional silk screen technology for the back glass can no longer meet the demand.

[0003] In order to increase the incident effect of sunlight, the industry also uses a reflective gap film to cover the gap between the cells corresponding to the back glass or back plate. The reflective gap film structure is as follows: Figure 1 As shown, it includes reflective microstructure, PET, EVA, and the installation diagram is as follows Figure 2 As shown; however, in the lamination process of photovoltaic modules, heating and vacuuming will cause the positions of the components of the photovoltaic modules to shift, and the metal reflective microstructure layer on the surface of the reflective gap film will easily come into contact with the battery cells and welding strips, causing local short circuits in the photovoltaic modules during actual outdoor power generation, affecting the working stability and safety of the modules. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a segmented reflective gap film for photovoltaics, so as to solve the problem of local short circuits easily occurring inside the reflective gap film photovoltaic modules, enhance the stability and safety of the photovoltaic modules, do not change the existing module production process, and reduce costs; further reduce the consumption of metal aluminum in the reflective microstructure coating and reduce the impact of the aluminum plating process on the environment.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the utility model is:

[0006] A segmented reflective gap film for photovoltaics, wherein the gap film comprises an EVA layer, a PET base film layer and a reflective microstructure layer from bottom to top, the reflective microstructure layer comprises a plurality of reflective microstructure segments arranged at intervals, the cross-section of the reflective microstructure segment is a plurality of continuously arranged triangular prism structures, and the vertex angle of the triangular prism is away from the EVA layer.

[0007] Preferably, in the photovoltaic segmented reflective gap film, the triangular prism structure of the reflective microstructure segment is an isosceles triangle structure, the vertex angle of the isosceles triangle structure is 25° to 165°, and the base angle is 7.5° to 77.5°.

[0008] Preferably, in the photovoltaic segmented reflective gap film, the material of the reflective microstructure layer is metal.

[0009] Preferably, the segmented reflective gap film for photovoltaics, wherein the length of the reflective microstructure segment is equal to the side length of half a cell sheet, and the length is 80mm to 250mm, and the reflective microstructure layer includes a plurality of reflective microstructure segments arranged at equal intervals, the length of the interval is 0.4mm to 2mm, and the width is 2mm to 12mm.

[0010] Preferably, the photovoltaic segmented reflective gap film has a width of 2 to 12 mm and a thickness of 0 to 1.5 mm.

[0011] Preferably, in the photovoltaic segmented reflective gap film, an auxiliary portion is provided on the gap, and the material of the auxiliary portion is a fluorine-containing coating or polyolefin.

[0012] Preferably, in the photovoltaic segmented reflective gap film, two sides of the auxiliary part match the triangular prism structure, the upper surface of the auxiliary part is lower than the top plane of the triangular prism structure, or the upper surface of the auxiliary part and the top of the triangular prism structure are on the same horizontal plane.

[0013] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0014] (1) The utility model discloses a segmented reflective gap film for photovoltaic use, wherein the reflective microstructure layer includes a plurality of reflective microstructure segments arranged at intervals, so as to prevent the reflective gap film from connecting the positive and negative electrodes of adjacent battery strings and causing a short circuit. This structural design avoids the local short circuit of the components caused by the reflective gap film without affecting the actual effect of the reflective gap film, and can further reduce the consumption of the metal aluminum of the reflective microstructure coating and reduce environmental pressure.

[0015] (2) The photovoltaic segmented reflective gap film of the utility model is provided with an auxiliary part, and the material of the auxiliary part is a fluorine-containing coating or a polyolefin material, which can enhance the weather resistance and anti-ultraviolet ability of the PET base film layer and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a segmented reflective gap film for photovoltaic use in the prior art.

[0017] Figure 2 Schematic diagram of the existing reflective gap membrane installation.

[0018] Figure 3 This is a schematic diagram of the structure of Example 1.

[0019] Figure 4 This is a schematic diagram of the structure of Example 2.

[0020] Figure 5 This is a schematic diagram of the installation of the photovoltaic segmented reflective gap membrane of the utility model. DETAILED DESCRIPTION

[0021] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "inside, outside", "up, down", "front, back", etc. are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] Figure 2 Steps for using the medium reflective gap film: stick the segmented reflective gap film on the surface of the back glass or back panel, with the side of the back glass or back panel with the photovoltaic segmented reflective gap film 5 facing up, and stack the back adhesive film, battery cell 6, front adhesive film, and front glass in sequence, and send them into the lamination process to complete the packaging.

[0024] Example 1

[0025] like Figure 3 A segmented reflective gap film for photovoltaics, wherein the gap film comprises, from bottom to top, an EVA layer 3, a PET base film layer 2 and a reflective microstructure layer 1, the reflective microstructure layer 1 comprises a plurality of reflective microstructure segments 11 arranged at intervals, the cross-section of the reflective microstructure segment 11 is a plurality of continuously arranged triangular prism structures 12, and the vertex angle of the triangular prism is away from the EVA layer 3.

[0026] The triangular prism structure of the reflective microstructure segment 11 is an isosceles triangle structure, the vertex angle of the isosceles triangle structure is 25°~165°, and the base angle is 7.5°~77.5°; the material of the reflective microstructure layer 1 is metal; the length of the reflective microstructure segment 11 is equal to the side length of the half-cell battery, and the length is 80mm~250mm. The reflective microstructure layer 1 includes a plurality of reflective microstructure segments 11 arranged at equal intervals, with an interval length of 0.4mm~2mm and a width of 2mm~12mm; the width of the segmented reflective gap film for photovoltaics is 2~12mm, and the thickness is 0~1.5mm.

[0027] The metal material of the reflective microstructure layer 1 is preferably aluminum. The function of the reflective microstructure layer 1 is to increase the incident sunlight through multiple reflections of the unused light that enters the gap between adjacent cells, thereby increasing the photoelectric conversion effect of the photovoltaic module. The function of the PET base film layer 2 is to provide structural support for the attached reflective microstructure aluminum layer. The function of the EVA layer 3 is to play a bonding role, and UV cut-off EVA can be selected to enhance the UV resistance of PET. The reflective microstructure layer 1 is a segmented structure, and the length of each segment is equal to the side length of half a cell. Figure 5 It is the relative position relationship between the reflective microstructure and the battery string.

[0028] Example 2

[0029] like Figure 4 A segmented reflective gap film for photovoltaics, wherein the gap film comprises an EVA layer 3, a PET base film layer 2 and a reflective microstructure layer 1 from bottom to top, wherein the reflective microstructure 1 comprises a plurality of reflective microstructure segments 11 arranged at intervals, wherein the cross-section of the reflective microstructure segment 11 is a plurality of continuously arranged triangular prism structures 12, wherein the top angle of the triangular prism is away from the EVA layer 3.

[0030] The triangular prism structure of the reflective microstructure segment 11 is an isosceles triangle structure, the vertex angle of the isosceles triangle structure is 25°~165°, and the base angle is 7.5°~77.5°; the material of the reflective microstructure layer 1 is metal; the length of the reflective microstructure segment 11 is equal to the side length of a half-cell battery cell, and the length range is 80mm~250mm. The reflective microstructure layer 1 includes a plurality of reflective microstructure segments 11 arranged at equal intervals, with an interval of 0.4mm~2mm and a width range of 2mm~12mm; the width of the segmented reflective gap film for photovoltaics is 2~12mm, and the thickness is 0~1.5mm.

[0031] An auxiliary part 4 is arranged on the interval, and the material of the auxiliary part 4 is a fluorine-containing coating or polyolefin; both sides of the auxiliary part 4 match the triangular prism structure 12, and the upper surface of the auxiliary part 4 is lower than the top plane of the triangular prism structure 12, or the upper surface of the auxiliary part 4 and the top of the triangular prism structure 12 are on the same horizontal plane.

[0032] At the segmented intervals of the reflective microstructure layer 1, an auxiliary part 4 is set, which is a fluorine-containing coating or a polyolefin material, and the height does not exceed the reflective microstructure, so as to protect the exposed PET substrate, enhance the weather resistance and UV resistance of the PET base film, and increase its service life in high-intensity lighting and high-UV scenes.

[0033] The use process of this utility model:

[0034] like Figure 5 The steps for using the segmented reflective gap film for photovoltaics are as follows: stick the segmented reflective gap film 7 on the surface of the back glass or backboard, with the side of the back glass or backboard with the segmented reflective gap film facing up, and set the reflective microstructure layer 1 on the side away from the back glass or backboard, then stack the back adhesive film, battery cell 6, front adhesive film, and front glass on the reflective microstructure layer 1 in sequence, and send it into the lamination process to complete the packaging.

[0035] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A segmented reflective gap film for photovoltaic use, characterized in that: The gap film comprises, from bottom to top, an EVA layer (3), a PET base film layer (2), and a reflective microstructure layer (1); the reflective microstructure layer (1) comprises a plurality of reflective microstructure segments (11) arranged at intervals; the cross-section of the reflective microstructure segment (11) is a plurality of continuously arranged triangular prism structures, and the top angles of the triangular prisms are away from the EVA layer (3); The reflective microstructure layer (1) comprises a plurality of reflective microstructure segments (11) arranged at equal intervals; an auxiliary portion (4) is arranged on the intervals; the material of the auxiliary portion (4) is a fluorine-containing coating or polyolefin; two sides of the auxiliary portion (4) match the triangular prism structure; the upper surface of the auxiliary portion (4) is lower than the top plane of the triangular prism structure, or the upper surface of the auxiliary portion (4) and the top of the triangular prism structure are on the same horizontal plane.

2. The photovoltaic segmented reflective gap film according to claim 1, characterized in that: The triangular prism structure of the reflective microstructure segment (11) is an isosceles triangle structure, wherein the vertex angle of the isosceles triangle structure is 25° to 165°, and the base angle is 7.5° to 77.5°.

3. The photovoltaic segmented reflective gap film according to claim 1, characterized in that: The material of the reflective microstructure layer (1) is metal.

4. The photovoltaic segmented reflective gap film according to claim 1, characterized in that: The length of the reflective microstructure segment (11) is equal to the side length of a half-cell battery sheet, and is 80 mm to 250 mm. The length of the interval is 0.4 mm to 2 mm, and the width is 2 mm to 12 mm.

5. The photovoltaic segmented reflective gap film according to claim 1, characterized in that: The photovoltaic segmented reflective gap film has a width of 2 to 12 mm and a thickness of 0 to 1.5 mm.

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