A kind of backplane for metal perforated solar cell and preparation method thereof

Abstract

The invention discloses a backboard for a metal perforation type solar battery and a preparation method of the backboard. The backboard sequentially comprises an insulation layer, a metal layer, an adhering layer, a base material layer and a weather-resisting layer, wherein the weather-resisting layer which is a fluororesin-containing composition is coated on the base material layer through a coating device, the fluororesin-containing composition comprises, in the total 100 percent, 25-50 percent of modified fluororesin, 1-5 percent of fumed silica, 10-25 percent of titanium dioxide, 1-10 percent of curing agent and 30-50 percent of solvent. Through optimized design of the fluororesin-containing composition formula, the fluororesin can be well combined with the base material layer under the condition of no addition of any adhesive, thus the weather-resisting layer becomes thinner, relevant materials are reduced, the production process is simplified, and the cost of the backboard is lowered; and meanwhile, the backboard is high in weather resistance, ultraviolet resistance and hydrothermal resistance performance, thus the protection function on a solar assembly is greatly improved, and the service life of the solar assembly is prolonged.

Description

technical field [0001] The invention relates to the technology in the field of solar backplanes, and in particular provides a backplane for metal perforated solar cells and a preparation method thereof. Background technique [0002] In solar modules, the role of the solar cell back sheet cannot be underestimated, and the solar cell back sheet plays the role of protecting the cells in the photovoltaic module. The traditional backsheet production method is to paste a pre-fabricated fluoropolymer film, especially a polyvinyl fluoride (PVDF) film, on a polyester (PET) substrate, typically by attaching a fluoropolymer film to both sides of the PET. To form a "sandwich" structure, the production process is to apply a thermosetting polyester adhesive on both sides of the substrate, and then thermally press and bond a PVDF film with a thickness of 38 µm to obtain a traditionally manufactured backplane. In the prior art, the Chinese invention patent number is 200710069782.4, and the...

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Problems solved by technology

[0003] Although this type of backsheet obviously improves the service life of solar modules, under the influence and damage of different humidity, temperature, oxygen and ultraviolet rays, the backsheet has a better performance in terms of weather resistance, ultraviolet resistance and heat and humidity resistance. At the same time, in the prior art, because the pre-production fluoropolymer film must have sufficient thickness to meet the requirements for its strength during lamination and post-processing procedures, the actual thickness ratio of the film is to provide protection performance The required thickness is large, resulting in the waste of expensive fluororesin films, which increases the cost of the product; as the market competition becomes more and more fierce, how to reduce the cost of the product has become one of the important issues that researchers need to solve urgently

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