Adhesive film for building photovoltaic module

Abstract

The invention discloses an adhesive film for a building photovoltaic module. A second adhesive film layer used for bonding a crystalline silicon battery piece and a TPT backboard comprises a modified EVA adhesive film layer and nano-silver ion thin film layers, wherein the nano-silver ion thin film layers are arranged on the upper surface and the lower surface of the modified EVA adhesive film layer in a press-fit mode, and the modified EVA adhesive film layer is made of modified EVA resin through a compression molding process. The modified EVA resin comprises, by mass, 90%-95% of EVA resin, 2%-4% of curing agents, 2%-5% of ultraviolet light absorbers and 1%-2% of coupling agents. In this way, the adhesive film can avoid the phenomenon that mutual overflow happens after the second adhesive film layer and a first EVA adhesive film layer are fused, thereby being capable of preventing visible light from entering a building and improving the photoelectric conversion rate of the building photovoltaic module.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic module packaging, in particular to an adhesive film for building photovoltaic modules. Background technique [0002] The structure of the photovoltaic module consists of a tempered glass panel, the first adhesive film layer, crystalline silicon cells, the second adhesive film layer, and a TPT backplane from top to bottom. In architectural photovoltaic modules, in order to prevent visible light from entering the building through the gaps in the crystalline silicon cells in the module, the second adhesive film layer needs to use a different material from the first adhesive film layer, that is, the second adhesive film layer except Like the first film layer, it needs to have good adhesion and anti-ultraviolet aging ability, and it also needs to have certain reflectivity, shading and thermal conductivity. The existing technical method is to add functional properties to the EVA film. The mo...

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Problems solved by technology

In building photovoltaic modules, in order to prevent visible light from entering the building through the gaps of crystalline silicon cells in the module, the second adhesive film layer needs to use a different material from the first adhesive film layer, that is, the second adhesive film layer except Like the first film layer, it needs to have good adhesion and anti-ultraviolet aging ability, and it also needs to have certain reflectivity, shading and thermal conductivity. The existing technical method is to add functional properties to the EVA film. The modified adhesive film prepared with additives is used as the second adhesive film layer, but in the component lamination process, the first adhesive film layer and the second adhesive film layer will overflow after melting at high temperature, thus affecting the quality of the first adhesive film layer. Light transmittance, reducing the photoelectric conversion rate of building photovoltaic modules