White high-reflectivity EVA compound coating

Abstract

The invention provides a white high-reflectivity EVA compound coating. High reflectivity of the coating is realized by improving structure of the EVA compound coating. In addition, for a photovoltaic component adopting the compound coating, efficiency of battery pieces is unaffected.

Description

technical field [0001] The invention relates to an EVA composite adhesive film, in particular to a high-reflection EVA composite adhesive film for photovoltaic module packaging. Background technique [0002] Solar energy is a green, non-polluting and inexhaustible energy source. Compared with other energy sources, solar energy is ubiquitous and can be used locally in most areas of the earth. Therefore, in the past ten years, the solar energy industry It has become the focus of the development of countries all over the world. The utilization of solar energy is mainly to convert it into electrical energy through solar panels, and then do other purposes, such as solar air conditioners, street lamps, electric vehicles and so on. Since the working environment of solar cell components is mainly outdoors, and solar cells cannot be directly exposed to natural conditions such as sunlight and rain, it is necessary to seal them. [0003] U.S. Patent No. 2001 / 0045229A1 pointed out tha...

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Problems solved by technology

[0006] The existing high-reflection EVA packaging film products on the market have the following problems during use: 1. It affects the appearance of the component. The high-reflection EVA packaging film is usually added with white fillers that can improve the reflectivity of the film. The white filler is dispersed in the EVA film. Due to heat during the lamination process, the ordinary high-reflection EVA film layer and the transparent EVA film layer enter a molten state. Under the dual effects of pressure and concentration difference, the two layers of EVA film will Interpenetration occurs, that is, the white filler migrates from the ordinary high-reflection EVA film layer to the transparent EVA film layer, which seriously affects the appearance of the module; 2. Pollution of the battery sheet reduces the photoelectric conversion efficiency of the module. In addition to the longitudinal pressure, due to the edge effect, it will also be subjected to lateral pressure, so the adhesive film in the molten state will also flow laterally, that is, the white filler will also migrate laterally with the flow of EVA adhesive, and penetrate into the battery sheet to pollute the battery sheet , attached to the battery sheet to reflect sunlight, reducing the amount of light on the battery sheet and reducing the photoelectric conversion efficiency of the solar cell module

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