High reflectivity photovoltaic backsheet and photovoltaic module

Abstract

The utility model relates to a kind of high reflectivity photovoltaic back sheet and photovoltaic module, including from top to bottom sequentially layering arrangement: adhesive layer, weather resistance protective layer, bonding layer, high reflection function layer, PET bottom layer, high reflection function layer includes the bright black ink layer directly printed on the surface of PET bottom layer, and the bright light varnish layer completely covers bright black ink layer, reflection pit structure for enhancing light reflection is equipped on the surface of bright black ink layer and / or PET bottom layer, and bright light varnish layer fills and covers reflection pit structure to form smooth mirror surface.Advantages are that: by setting reflection pit structure and bright light varnish layer fill, the reflectivity is improved.The reflection pit structure can produce efficient diffuse reflection and multiple reflection to incident light, greatly increase the reflection path of light, greatly improve back sheet total reflectivity.Meanwhile, the structure can improve contact surface area, form firm mechanical interlocking effect, make bright black ink layer and bright light varnish layer closely combine, reduce the probability of interlayer peeling, prolong service life.

Claims

1. A high-reflectivity photovoltaic backsheet, comprising, from top to bottom, the following layers stacked sequentially: an adhesive layer (5), a weather-resistant protective layer (4), an adhesive layer (3), a high-reflectivity functional layer (2), and a PET bottom layer (1), characterized in that, The high-reflectivity functional layer (2) includes a glossy black ink layer (21) directly printed on the surface of the PET substrate (1) and a glossy varnish layer (22) that completely covers the glossy black ink layer (21). A reflective pit structure (A) for enhancing light reflection is provided on the surface of the glossy black ink layer (21) and / or the PET substrate (1), and the glossy varnish layer (22) fills and covers the reflective pit structure (A) to form a flat mirror surface.

2. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The depth of the reflective pit structure (A) is less than or equal to the thickness of the glossy black ink layer (21).

3. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The reflective pit structure (A) is a V-shaped or arc-shaped pit distributed in a dot matrix.

4. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The weather-resistant protective layer (4) is transparent or semi-transparent.

5. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The adhesive layer (5) is distributed in strip, dot, honeycomb or grid pattern on the surface of the weather-resistant protective layer (4).

6. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The weather-resistant protective layer (4) is a fluorinated backsheet film, a polyamide film, or one that has undergone weather-resistant treatment.

7. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The adhesive layer (3) is one of polyurethane adhesive, acrylate adhesive or epoxy resin adhesive.

8. The high-reflectivity photovoltaic backsheet according to claim 1, characterized in that, The adhesive layer (5) is one of polyethylene film, ethylene-vinyl acetate copolymer film or polyolefin elastomer film.

9. A photovoltaic module, characterized in that, The photovoltaic module includes the high reflectivity photovoltaic backsheet as described in any one of claims 1-8.

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