Single-side coated and integrated backplane for photovoltaic modules

Abstract

The invention discloses a single-side coated and integrated backplane for photovoltaic(PV) modules. The backplane is obtained through co-extrusion of a polyester basic layer and a modified polyester thin layer. The surface of the polyester basic layer is coated with a fluoro-carbon resin coating. The polyester basic layer is prepared by mixing 1-10 parts by weight of a functional master batch polyester slice and 1 part by weight of a pure polyester slice. The modified polyester layer comprises a dicarboxylic acid, a diol, a fluorine-containing monomer, titanium dioxide powder, a catalyst, a heat stabilizer, a phosphorus compound, an antioxidant, a UV absorber, a light stabilizer, an antistatic agent and an anti-hydrolysis agent. The fluoro-carbon resin coating is obtained by curing a two-component FEVE fluoro-carbon coating under normal temperature. The fluoro-carbon resin coating comprises a polymer matrix, an aliphatic polyisocyanate curing agent, a solvent, an additive and a filler.

Description

technical field [0001] The invention relates to a backboard of a photovoltaic module, in particular to an integrated single-side coated backboard for a photovoltaic module. Background technique [0002] Under the dual pressure of air pollution and climate change, clean energy alternatives continue to accelerate. According to the scale development index provided by the National Energy Administration, by 2020 my country's installed capacity of solar power generation is expected to reach 160 million kilowatts, of which the total installed capacity of photovoltaic power generation will reach 150 million kilowatts, which indicates the rapid expansion of the scale of photovoltaic power generation. What is more noteworthy is that in order to solve the severe light abandonment phenomenon in some centralized photovoltaic power plants, the development of distributed photovoltaics has recently entered the fast lane. The solar energy utilization opinion draft issued by the National Ener...

AI Technical Summary

Problems solved by technology

The water vapor transmission rate of mainstream single-sided coated backsheets in the market today just meets the basic requirements of the national standard <1.75kWh. Acetic acid will gradually corrode the battery sheet, which will eventually affect the power generation efficiency of the battery and the service life of the components

Generally, the reflectivity of the coated backplane is low, and the solar reflectance of the coated backplane in the wavelength range of 400~1100nm is difficult to exceed 80%, which causes a part of the sunlight to pass through the backplane, causing light loss and reducing the photoelectric conversion. efficiency

In addition, solar cells do not have a photoelectric effect on infrared light with a wavelength greater than 1100nm, but only convert it into heat energy, causing the temperature of the module to rise and affecting the efficiency of the battery. The thermal conductivity of mainstream backplanes in the market today is only 0.2W / m.K left and right, seriously restricting the efficiency of battery power generation