Three-layer EVA and PO composite photovoltaic film with high reliability and high gain and preparation method of composite photovoltaic film

Abstract

The invention relates to the technical field of EVA photovoltaic films, in particular to a three-layer EVA and PO composite photovoltaic film with high reliability and high gain. The composite photovoltaic film is prepared from an upper transparent EVA layer, a middle white reflective EVA layer and a lower transparent PO layer, wherein the upper transparent EVA layer is a transparent EVA casting composite layer with thickness of 25-150 mu m; a pyramid-shaped reflective structure with thickness of 250-550 mu m is arranged on the surface of the middle white reflective EVA layer; the lower transparent PO layer is a transparent EVA casting composite coextrusion layer with thickness of 50-225 mu m. After the method is adopted, the EVA and PO composite photovoltaic film with high reliability andhigh gain has the characteristics of high bonding strength with battery pieces, good package reliability and long service life, and has higher light emission rate and better reflection effect than conventional white EVA films. After the front surface of the structure is subjected to irradiation crosslinking, the surface structure cannot be melted by heating in the lamination process, integrity ofthe high reflection structure is guaranteed, the diffuse reflection effect of reflected light rays among gaps of battery pieces is improved, and accordingly, assembly power is greatly improved.

Description

technical field [0001] The invention relates to the technical field of EVA photovoltaic adhesive film, in particular to a three-layer high-reliability and high-gain EVA and PO composite photovoltaic adhesive film and a preparation method thereof. Background technique [0002] In the past ten years, due to technological progress and the influence of national photovoltaic policies, my country's photovoltaic industry has developed very rapidly. Since 2008, its output and output value have surpassed Germany, Japan and other photovoltaic powerhouses to rank first in the world. However, at present, it is difficult to improve the photoelectric conversion efficiency of solar cells, which has been maintained between 19% and 21%, and there is still a packaging loss after the cells are packaged into modules. Therefore, how to improve the photoelectric conversion efficiency of photovoltaic cells has become the world's photovoltaic industry. The focus of attention and an important refere...

AI Technical Summary

Problems solved by technology

Due to this structure, sunlight is incident from the glass, passes through the upper EVA film, and reaches the cells to realize photoelectric conversion. If it is photovoltaic glass, 100% of the sunlight will be directly emitted and lost. If it is a photovoltaic backplane, because the reflectivity of the backplane is not high, only 70-80% of the light is reflected to the surface of the cell to continue generating electricity. This also has 20- 30% of sunlight is lost

At present, the conventional white EVA film still has the effects of limited gain effect and low reflectivity. It is difficult to further improve the power generation efficiency of the module. Electron radiation pretreatment technology is used, but the current application of electron radiation technology in the photovoltaic field is relatively short. There is still a certain impact on the reliability of the product, resulting in low peel strength

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