High-water blocking backplate material easy to clean for large system photovoltaic module

Abstract

The invention discloses a high-water blocking backplate material easy to clean for a large system photovoltaic module. The backplate material sequentially comprises an outer layer, a bonding layer, a base film layer and an inner layer, wherein the outer layer comprises fourth main body resin, a grafting auxiliary, an inorganic filler and a modified polymer brush grafted on a surface of the fourth main body resin. The local discharge voltage of the backplate material fabricated according to the invention is larger than 1,500V, the backplate material can be applied to the large system photovoltaic module, the power generation cost is reduced, and the power generation efficiency is improved; meanwhile, the backplate material is relatively low in moisture transmittance and can be used in a humid environment for a long time, and phenomena such as snail tracks and PID are improved; the outer surface of the backplate material also has a favorable function of being easy to clean, and the clean appearance can be maintained during the long-term application process of the photovoltaic module in the outdoors; and moreover, the backplate material fabricated according to the invention also has high reflectivity, excellent weather resistance and high cohesiveness with EVA adhesive films, is excellent in integral function and is suitable for the large system photovoltaic module.

Description

technical field [0001] The invention relates to a high-resistance water-resistance and easy-to-clean backboard material used for photovoltaic modules in large systems, and belongs to the field of photovoltaic packaging materials. Background technique [0002] With the depletion of coal, oil, natural gas and other fossil fuels and the increasingly serious environmental pollution, vigorously developing new energy has become an important task of globalization. In recent years, as a representative of green energy, solar power has attracted more and more attention. At present, the application of solar energy is mainly to convert solar energy into electrical energy through solar power generation components. Solar power generation components are mainly composed of low-iron tempered glass, front EVA film, solar cells, rear EVA film and back sheet. Among them, the back sheet plays the role of protecting the battery sheet such as water vapor barrier, electrical insulation, adhesion w...

AI Technical Summary

Problems solved by technology

[0003] However, the partial discharge voltage of photovoltaic backplanes currently on the market is usually around 600-1000VDC, which can only be adapted to conventional photovoltaic module systems, and there are great safety hazards for photovoltaic modules of larger systems. Voltage photovoltaic backplane is very necessary to reduce the cost of photovoltaic modules

There have been some reports on high-system backplanes, such as the method described in patent CN201320878102.4 by increasing the thickness of the backplane base material layer to increase the partial discharge voltage of the backplane. This method will lead to difficulties in post-processing and increased production costs, etc. problem and the water vapor transmission rate can only be maintained at 2g / m 2 It is easy to cause snail pattern, PID and other phenomena to appear around d; patent CN201110316402.9 uses glass fiber cloth to endow the backplane with high pressure resistance to improve the partial discharge voltage of the backplane, but this solution has disadvantages such as cumbersome process and high production cost

The current solution is not comprehensive enough, and there is no way to achieve high-voltage reliability while taking into account more other functions

In addition, the weather-resistant layer used in conventional backplanes is generally some materials with low surface energy such as fluorocarbon coatings or fluorine films. Such backplanes have weak anti-fouling ability, and some carbonates, Some organic and inorganic pollutants such as sulfates, silicates, proteins, and natural polymers can easily adhere to the surface of the backsheet and are difficult to clean, thereby affecting the heat dissipation of the backsheet, reducing the safety of solar cells, and increasing the efficiency of removing these impurities. labor cost

Images