Photovoltaic module encapsulated by high-performance weather-resistant composite material and preparation method thereof

Abstract

The invention relates to a high-performance weather-proof composite material encapsulation photovoltaic assembly, which mainly comprises tempered glass, battery pieces and a back plate in sequential arrangement from top to bottom, wherein the tempered glass and the battery pieces are compounded by a layer of composite material glue film; the back plate and the battery pieces are compounded by a layer of composite material glue film; a tin-coating copper belt is used for serial and parallel connection between the battery pieces and is used for gathering leading-out wires; a TPT polyvinyl fluoride composite film is used for protection between the composite material film and the back plate, and is subjected to glue sealing; a wiring box is arranged at the back surface of the back plate and is connected with the leading-out wires; after the back plate is fixed, an aluminum alloy side frame is installed; the composite material glue film comprises a polypropylene layer and a polyolefin layer; pinhole meshes are uniformly formed in the polypropylene layer; a polyurethane layer is respectively sprayed and coated on the front surface and the back surface of the polypropylene layer for compounding the polypropylene layer and the polyolefin layer. The photovoltaic assembly provided by the invention has the characteristics that the cost is low; the performance is high; the weatherability is realized.

Description

technical field [0001] The invention relates to a photovoltaic module encapsulated by a high-performance weather-resistant composite material and a preparation method thereof. It belongs to the field of solar photovoltaic. Background technique [0002] With the rapid development of the solar photovoltaic industry, domestic and foreign enterprises and experts are strongly aware that solar photovoltaic cell packaging materials and process technology are the key technologies to improve the life of photovoltaic modules and reduce the cost of use to achieve higher economic benefits. As an important part of solar photovoltaic modules, solar encapsulation adhesive film plays the role of sealing and protecting solar cells, bonding the upper and lower substrates, and preventing water vapor intrusion. In terms of performance, it requires good light transmittance and waterproof function. Excellent Anti-aging performance and bonding performance. At present, solar photovoltaic modules ...

AI Technical Summary

Problems solved by technology

At present, solar photovoltaic modules produced by enterprises all over the world generally use EVA as the packaging material. EVA is an ethylene-vinyl acetate copolymer. It has some objective defects, such as poor anti-ultraviolet aging performance, anti-moisture and heat aging ability and waterproof performance, and is easy to degrade. yellowing and breaking

These will reduce the service life of photovoltaic modules and greatly reduce the power generation efficiency

Since EVA is an ethylene-vinyl acetate copolymer, under the action of light, heat, cold, oxygen and water vapor, it will produce unsaturated double bonds, acetic acid, a small amount of acetaldehyde, ketone and lactone structures, etc., resulting in transparent PV modules. Decreased light rate and photoelectric conversion rate, internal yellowing, aging and cracking, and the acidic substances released by EVA during the aging process will accelerate the corrosion of electrodes in the module, resulting in low power generation efficiency of photovoltaic modules or even scrapping and cracking

In recent years, some solar photovoltaic module companies and solar power stations have reported that the photovoltaic modules of solar cells are yellowed, cracked, and degummed due to the influence of heat and humidity on the packaging materials under natural climate conditions, which greatly reduces the photoelectric conversion efficiency of solar cells. As well as examples of shortened and final service life, these examples involve the aging resistance and long-term performance of packaging materials, the issue of longer service life of photovoltaic modules and higher target economic benefits, and the domestic and foreign research on the use of adhesive films for solar cell module packaging Proposed service life goal of more than 30 years

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