Reflection gap film

Abstract

The utility model provides a reflection gap film. The gap film sequentially comprises a high cut-off EVA layer, a high reflection PET layer, a UV glue structure layer and a fluorine coating from bottom to top. According to the reflection gap film provided by the utility model, the UV glue structure layer and the high-reflection PET layer are arranged, so that incident sunlight at the gaps of the battery pieces can be utilized, and the photoelectric conversion efficiency can be improved; by arranging the high-cut-off EVA layer, ultraviolet band light can be absorbed, and the problem of yellowing of the photovoltaic module is solved; an aluminum-based structure is not included, so that light pollution can be reduced, and the problems of power attenuation, local short circuit and the like caused by contact between the aluminum-based structure and a battery piece can be avoided; compared with mirror reflection of an aluminum base layer structure, the reflection gap film belongs to diffuse reflection, the anti-dazzle capacity is better, and light pollution can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic component manufacturing, and specifically relates to a reflective gap film. Background Art

[0002] Photovoltaic modules can generate electricity using sunlight, but due to the gaps between the cells in the photovoltaic modules, the sunlight passing through the gaps is not fully utilized, which reduces the photoelectric efficiency of the photovoltaic modules. Therefore, it is necessary to utilize the light energy incident on the gaps between the photovoltaic module cells to improve the photoelectric conversion efficiency of the photovoltaic modules.

[0003] The main solution at present is to coat a layer of glaze on the photovoltaic glass in the gap area corresponding to the battery cell to improve the reflectivity. However, as the thickness of the photovoltaic glass of the double-glass module gradually decreases, the use of thinner glazed glass can easily lead to problems such as panel explosion, and the reflectivity of the glazed glass is limited, and the power increase of the module has reached a bottleneck.

[0004] Therefore, reflective gap films can be used instead of glaze coating. The gap films have obvious advantages: low cost and high reflectivity. However, conventional gap films contain aluminum-plated structures, which have high costs and cause greater environmental pollution. The gap films are also prone to aging and yellowing under ultraviolet light, which can cause component power attenuation and affect the overall appearance of the component. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art, provide a reflective gap film, reduce the cost of photovoltaic modules, improve the conversion efficiency of photovoltaic modules, and improve the yellowing of photovoltaic modules.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the utility model is:

[0007] A reflective gap film, wherein the gap film comprises, from bottom to top, a high-cutoff EVA layer, a high-reflective PET layer, a UV glue structure layer and a fluorine coating layer.

[0008] Preferably, in the reflective gap film, the thickness of the high cutoff EVA layer is 70 μm±10 μm.

[0009] Preferably, in the reflective gap film, the high cutoff EVA layer has a light transmittance of less than 30% in the ultraviolet band of 290 mm to 380 mm.

[0010] Preferably, in the reflective gap film, the thickness of the high-reflective PET layer is 40 μm±2 μm.

[0011] Preferably, in the reflective gap film, the reflectivity of the high-reflective PET layer is ≥94%.

[0012] Preferably, in the reflective gap film, the thickness of the UV adhesive structure layer is 10 μm±10 μm.

[0013] Preferably, in the reflective gap film, the thickness of the fluorine coating is 14 μm±2 μm.

[0014] Preferably, in the reflective gap film, the surface of the fluorine coating is frosted and has a surface roughness of 8-12 μm.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0016] (1) The reflective gap film of the utility model uses a combination of ordinary photovoltaic perforated non-silk-screened back glass and a gap film instead of glazed glass, which can reduce the cost of photovoltaic modules, improve the overall mechanical strength of photovoltaic solar modules, and reduce the risk of photovoltaic module explosion.

[0017] (2) The reflective gap film of the utility model can utilize the incident sunlight at the gap between the battery cells by setting a UV glue structure layer and a high-reflective PET layer, thereby improving the photoelectric conversion efficiency; and can absorb ultraviolet band light by setting a high-cutoff EVA layer, thereby improving the yellowing problem of photovoltaic modules.

[0018] (3) The reflective gap film of the utility model does not contain an aluminum-based structure, which can reduce light pollution and avoid the contact between the aluminum-based structure and the battery cell, thereby causing problems such as power attenuation and local short circuit. Compared with the mirror reflection of the aluminum-based structure, the reflective gap film of the present application is diffuse reflection, has better anti-glare ability, and can reduce light pollution. In addition, during the lamination process, the aluminum-based structure may have a possibility of penetrating the adhesive film and contacting the battery cell. The battery cell is prone to short circuit when it contacts the aluminum-based element, causing power attenuation of the component. More seriously, due to the local high temperature after the short circuit, a hot spot heating reaction occurs, and the problem battery has voltage reversal, causing the photovoltaic solar module to break. The reflective gap film of the present application removes the aluminum-based structure to avoid the above problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the reflective gap film in the prior art.

[0020] Figure 2 It is a schematic structural diagram of the reflective gap membrane of the utility model.

[0021] Figure 3 Schematic diagram of the structure of a photovoltaic solar panel. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] like Figure 1 The structure of the gap film now includes a structural layer 5, a PET base layer 6, and an adhesive layer 7; the structural layer 5 is mostly an aluminum-plated structure, which mirror-reflects the incident light to the front glass, and then reflects it to the battery cell through the secondary reflection of the glass, thereby increasing the light intensity and improving the component power.

[0025] like Figure 2 The utility model provides a reflective gap film, wherein the gap film comprises a high cutoff EVA layer 1, a high reflective PET layer 2, a UV glue structure layer 3 and a fluorine coating layer 4 from bottom to top.

[0026] The thickness of the high cut-off EVA layer 1 is 70μm±10μm; the transmittance of the high cut-off EVA layer 1 in the ultraviolet band of 290mm~380mm is less than 30%; the thickness of the high reflective PET layer 2 is 40μm±2μm; the reflectivity of the high reflective PET layer 2 is ≥94%; the thickness of the UV adhesive structure layer 3 is 10μm±10μm; the thickness of the fluorine coating 4 is 14μm±2μm; the surface of the fluorine coating 4 is frosted and the surface roughness is 8-12μm.

[0027] The surface of the fluorine coating is frosted to further enhance the diffuse reflection effect; the reflectivity of the high-reflective PET layer can reach about 94%, and the reflectivity of the conventional aluminum-based structure is 90%~93%; the high-cutoff EVA layer 1 has a transmittance of less than 30% in the ultraviolet band of 290mm~380mm, which can block more ultraviolet light from entering the photovoltaic solar panels and accelerate aging.

[0028] Installation and use steps of this application:

[0029] like Figure 3, use a gap film laminating machine to stick the reflective gap film on the back glass 8, the back glass 8 is an ordinary photovoltaic perforated back glass without silk screen printing, the high cutoff EVA layer is in contact with the back glass 8, the high cutoff EVA layer is positioned and the reflective gap film is bonded to the back glass 8 at 200° through the gap film laminating machine, the purpose of bonding is to prevent the gap film from being positioned; then the back glass 8, back adhesive film 9, battery string 10, front adhesive film 11, and front glass 12 with the reflective gap film are stacked and sent to the laminator in sequence, the fluorine coating 4 is set on the side close to the back adhesive film 9, and finally the high cutoff EVA is completely melted by the laminator and bonded to the glass to obtain a photovoltaic solar module.

[0030] The reflective gap film of the utility model removes the traditional aluminum base structure, and directly uses a fluorine coating to cover the UV glue structure layer, and performs a frosting process on the surface of the fluorine coating. Firstly, it is used to improve the reflectivity, and then the reflectivity is further improved through frosting structuring on this basis. Secondly, it is used to prevent the influence of ultraviolet rays on PET materials and improve the overall high temperature resistance of the material. The last layer uses a high-cutoff EVA layer instead of traditional EVA to absorb ultraviolet light. The ultraviolet aging attenuation after UV120kwh can be controlled at about 2%, which improves the yellowing problem of photovoltaic components.

[0031] The price of the mainstream aluminum coating gap film on the market is 40~45 yuan / ㎡, and the usage of a C72 module is about 0.18㎡. The cost of using gap film for a module is 6-8 yuan / piece.

[0032] The unit price of the reflective gap film used in this application is 20 to 25 yuan / ㎡, and a photovoltaic solar panel can save half of the estimated cost.

[0033] 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 reflective gap film, characterized in that: The gap film comprises, from bottom to top, a high-cutoff EVA layer (1), a high-reflection PET layer (2), a UV adhesive structure layer (3) and a fluorine coating layer (4).

2. The reflective gap film according to claim 1, characterized in that: The thickness of the high cut-off EVA layer (1) is 70 μm±10 μm.

3. The reflection gap film according to claim 1, characterized in that: The high cut-off EVA layer (1) has a light transmittance of less than 30% in the ultraviolet band of 290 mm to 380 mm.

4. The reflective gap film according to claim 1, characterized in that: The thickness of the high-reflection PET layer (2) is 40 μm±2 μm.

5. The reflective gap film according to claim 1, characterized in that: The reflectivity of the high-reflective PET layer (2) is ≥94%.

6. The reflective gap film according to claim 1, characterized in that: The thickness of the UV adhesive structure layer (3) is 10 μm±10 μm.

7. The reflective gap film according to claim 1, characterized in that: The thickness of the fluorine coating (4) is 14 μm±2 μm.

8. The reflective gap film according to claim 1, characterized in that: The surface of the fluorine coating (4) is frosted and has a surface roughness of 8-12 μm.

Images