EVA (ethylene vinyl acetate) adhesive film for package of solar cell module

Abstract

The invention relates to an EVA (ethylene vinyl acetate) adhesive film for package of a solar cell module, which comprises EVA, an organic peroxide crosslinking agent, a crosslingking accelerant, a protective agent and adhesive power promoting high polymer containing a branched structure, wherein the branched structure is connected onto primary carbon, secondary carbon or tertiary carbon atoms of the adhesive power promoting high polymer; and n is equal to 1-10, and m is equal to 1-4. The EVA adhesive film solves the problem that the adhesive power is obviously reduced after the EVA adhesive film is used under a severe environment for a long time, ensures the package performance of the solar cell module, reduces the corrosion of environmental moisture to cells of the module and leads, and can prolong the service life of the solar cell module.

Description

technical field [0001] The invention relates to an EVA adhesive film used for packaging solar battery modules. Background technique [0002] The traditional fuel energy is decreasing day by day, and the damage to the environment is becoming more and more prominent. Therefore, the whole world has turned its attention to renewable energy, hoping that renewable energy can change the energy structure of human beings and maintain long-term sustainable development. Among them, solar energy has become the focus of people's attention due to its unique advantages. Abundant solar radiation energy is an important energy source, which is inexhaustible, non-polluting, cheap, and can be freely utilized by human beings. [0003] Solar cells are the most typical application of solar energy. Solar power generation uses the quantum effect principle of silicon semiconductors to directly convert the visible light of solar energy into electrical energy. However, if the silicon wafer is directl...

AI Technical Summary

Problems solved by technology

[0006] Although EVA has become the most commonly used packaging material for solar cells, there are still some reliability risks. The bonding between EVA and glass is achieved by the force generated by the hydrogen bond components in ethylene-vinyl acetate and glass. Purpose, this force is relatively weak, usually only 30N / cm, the adhesion to glass is not strong enough, there is a risk of loss or even separation of EVA film and glass after long-term use

In order to solve this problem, the usual way to increase the adhesion is to add an adhesion promoter to EVA, so that the adhesion between the EVA film and the glass can reach more than 80N / cm, but the film will be damaged by long-term humidity and heat aging. Finally, there is still the disadvantage of significantly reduced adhesion, especially for some components whose edge packaging is not very good, it is easy to form channels at the place where the edge adhesion is low, causing short circuit of the component, and eventually leading to scrap

Therefore, the problem of reduced adhesion of EVA film has been plagued by film manufacturers.

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