Photovoltaic Module - EVA
Release time:
Dec 20,2024
The material used for encapsulating crystalline silicon solar cells is EVA, which is a copolymer of ethylene and vinyl acetate. EVA is a thermosetting hot melt adhesive that has no stickiness at room temperature for ease of handling. After being subjected to certain conditions of heat and pressure, it undergoes melting adhesion and cross-linking curing, becoming completely transparent. Long-term practice has proven that compared to other materials, EVA has achieved quite satisfactory results in solar cell packaging and outdoor use.
The thickness of EVA is between 0.4 and 0.6 mm, requiring a flat surface and uniform thickness, containing cross-linking agents that can cross-link at a curing temperature of 150°C, and forming a stable adhesive layer using extrusion molding technology.
There are mainly two types of EVA: fast curing and conventional curing.
EVA has excellent flexibility, impact resistance, elasticity, optical transparency, adhesion, resistance to environmental stress cracking, weather resistance, chemical resistance, and thermal sealing properties.
Cured EVA can withstand atmospheric changes and has elasticity. It acts as a "cover and cushion" for crystalline silicon solar cells, bonding with the upper protective material glass and the lower protective material TPT using vacuum lamination technology.
On the other hand, after bonding with glass, it can enhance the light transmittance of the glass, playing a role in increasing transparency, and has a gain effect on the output of solar cell modules.
Different temperatures have a significant impact on the cross-linking degree of EVA, which directly affects the performance and service life of the module. In the molten state, EVA bonds with crystalline silicon solar cells, glass, and TPT, involving both physical and chemical bonding in the process. When EVA is heated to a certain temperature, the cross-linking agent decomposes to produce free radicals, triggering the bonding between EVA molecules, forming a three-dimensional network structure, leading to the cross-linking and curing of the EVA adhesive layer. When the cross-linking degree reaches over 60%, it can withstand environmental changes, thus using EVA to encapsulate solar cell modules can achieve a long service life. In actual production, the cross-linking degree of EVA is generally controlled between 85% and 95%.
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