High-barrier flexible back film

Abstract

The invention provides a high-barrier flexible back film. The high-barrier flexible back film mainly comprises a substrate film, aluminum foil, an uvioresistant coating, a protection film layer, and an adhesive layer; two sides of the aluminum foil are compounded with the substrate film through an adhesive respectively; the uvioresistant coating can be directly coated or sputtered outside a compound film; the protection film layer can be directly coated or compounded on the uvioresistant coating; and the adhesive layer is coated on the inner side of the compound film, so the high-barrier flexible back film can be obtained. In the high-barrier flexible back film, the aluminum foil is used as an intermediate layer and has an extremely high barrier property, so the high barrier requirement of novel flexible thin-film solar products such as Cu(InGa)Se2 (CIGS), OPV and the like can be met, and the aluminum foil can reflect light to improve the conversion efficiency of solar energy; moreover, the high-barrier flexible back film is mainly prepared by a compound process. The obtained solar cell back film has the extremely high barrier property and mechanical strength, and can protect a solar cell well; and the compound process is mainly adopted, a production process is simple, production technologies for all the materials are mature, and all the materials are low in cost. Therefore, the back film is high in scale yield, the cost of the back film is far lower than that of similar products on market, and due to the advantage of the flexibility of the back film, the characteristics of flexibility, thinness and the like of a thin film solar cell can be exerted well.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a high-barrier flexible back film for flexible solar cell packaging. Background technique [0002] Solar energy plays an important role in the renewable energy industry, and it is an inexhaustible green energy. It is a very effective way to use solar cells to convert solar energy into electrical energy. Solar cells are mainly composed of surface encapsulation layer, EVA sealing layer, solar cell sheet and solar cell back film layer; the main components of surface encapsulation layer and back film layer are The function is to improve the overall mechanical strength of the solar cell, and act as a barrier to water, oxygen, corrosive gas and liquid in the external environment, so as to prevent damage to the solar cell. Due to the many advantages of thin-film solar energy, it has been developed rapidly; however, the commonly used high-cost polysilicon solar products have low barrier requi...

AI Technical Summary

Problems solved by technology

Due to the many advantages of thin-film solar energy, it has been developed rapidly; however, the commonly used high-cost polysilicon solar products have low barrier requirements for water vapor, but the emerging flexible thin-film solar products represented by CIGS, OPV, etc. have low requirements for packaging materials. Barrier requirements are high, and currently commonly used solar cell packaging materials are difficult to meet the barrier index

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