Back plate film of solar cell

Abstract

The invention discloses a back plate film of a solar cell. The back plate film comprises fluoroplastic films on the inner and outer layers adhered by an adhesive and a moisture resisting film on a middle layer, wherein the fluoroplastic films are grafted with acrylate substances. The fluoroplastic films are grafted with acrylate substances through irradiation, and the grafting chain is connected with the fluoroplastic through a chemical bond, being relatively stable and not weakening with the time lasting; and therefore, the sticking property between the prepared back plate film of the solar cell and an EVA (ethylene vinyl acetute) adhesive film as well as the stability of the back plate film is ensured, and the service life of the prepared back plate of the solar cell is long.

Description

technical field

[0001] The invention relates to a protective and supporting film on the back of a solar cell, in particular to a back sheet film of a solar cell; the invention also relates to a method for preparing a fluoroplastic film grafted with acrylic substances in the back sheet film of a solar cell. Background technique

[0002] The solar cell backsheet film is located on the back of the solar cell panel, which protects and supports the cells, and needs to have reliable insulation, water resistance, and aging resistance; it usually consists of an inner and outer weather-resistant layer and a middle moisture-resistant layer. composition.

[0003] At present, the commonly used solar cell backsheet films mainly include TPT, TPE, all-PET and PET / polyolefin structures. Among them: T refers to the polyvinyl fluoride (PVF) film of DuPont in the United States; P refers to the biaxially stretched polyethylene terephthalate film, that is, PET film, also known as polyester fil...