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EVA
With the development of renewable energy, solar photovoltaic technology has been widely used around the world. Solar modules are the core of photovoltaic systems, and their performance and durability directly determine the efficiency and economy of the entire solar power generation system. Among many materials, EVA (ethylene-vinyl acetate copolymer) plays a key role as an important packaging material. This paper will discuss the main role of EVA in solar modules and its technical requirements.
the role of EVA
Bonding and fixing
The EVA material is used to firmly bond the solar cells to the optical glass at the front and the backplane at the back, thus forming a single unit. This bonding not only ensures the stability of the battery, but also improves the mechanical strength of the component, preventing deformation and falling off under the influence of the external environment.
Protection function
EVA can effectively protect solar cells from moisture, dust and other environmental pollutants. This protection helps to extend the service life of the component and keep its photoelectric performance stable.
Light transmittance
EVA material has good optical properties, which can maximize the transmittance of light, thus enhancing the photoelectric conversion efficiency of solar modules. The high light transmittance ensures that more sunlight is absorbed by the battery, increasing the overall power generation capacity.
Weather fastness
EVA has excellent weather resistance and can withstand the effects of high and low temperatures, ultraviolet radiation and moisture, so that solar modules can still operate normally in extreme weather conditions.
EVA technical requirements
Bond strength
The bonding property of EVA is the key index to evaluate its effect. EVA must maintain high bonding strength under long-term use and different climatic conditions to avoid stripping of the battery during use.
Light transmittance
The light transmittance of EVA usually needs to be higher than 90% to ensure that as much sunlight as possible can pass through the material and be absorbed by the cell. The light transmittance directly affects the overall power generation efficiency of the component.
Temperature stability
The performance of EVA at high temperatures is critical. Its thermal deformation temperature should usually be higher than 80 ° C to ensure that no performance reduction or deformation occurs in high temperature weather.
Aging resistance
EVA needs to have good UV resistance and ozone resistance, can withstand long-term sunshine and climate change, and avoid performance degradation caused by aging.
Thickness uniformity
The thickness of EVA is usually between 0.5mm and 1.0mm, and uniformity needs to be maintained to prevent bubbles or defects during the packaging process, which is essential for the performance and aesthetics of the component.
Summary
As an important packaging material in solar modules, EVA plays an important role in bonding, protecting and improving the photoelectric conversion efficiency. With the continuous progress of photovoltaic technology, the application of EVA materials is also gradually optimized to meet higher performance requirements. By understanding the role and technical requirements of EVA, participants in the relevant industry chain can better choose and use EVA to promote the sustainable development of the solar industry.
Home energy storage product series
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