If the crystalline how thick should eva solar film be for module silicon solar mobile wafer is without delay uncovered to the environment, its photoelectric conversion characteristic can be attenuated. So we’d use an elastic adhesive layer with high transparency, mild getting old resistance, and right adhesion that could withstand changes in the environment is used to encapsulate the battery p.C.
how thick should eva solar film be for module
The elastic adhesive layer stick to the top shielding fabric glass and backside protective material TPT combines it into one to shape a solar cell module. Before the 1980s, specialists from domestic and abroad have ever attempted liquid silicone resins and polyvinyl butyral resin sheets (PVB) to be adhesion materials.
situations how thick should eva solar film be for module
EVA movie has been developed abroad for the reason that Eighties. It is based totally on EVA, supplemented through several modifiers, and warm rolled into a skinny film product via a movie forming system.
The encapsulating cloth for crystalline silicon solar mobile is Eva movie, the English call is Ethylene Vinyl Acetate. It is a copolymer of ethylene and vinyl acetate, the chemical components structure is as follows. Ethylene-vinyl acetate copolymer (EVA) is one of the maximum important ethylene copolymers. According to the content of vinyl, how thick should eva solar film be for module acetate in the copolymer, its important types may be divided into two categories, this is, the content material of vinyl acetate (EVA) in the product is ready five%-40% (mass fraction), that’s called EVA.
More than 40% is known as vinyl acetate-ethylene copolymer (VAE)
EVA for solar cells is a form of warm-melt adhesive, which is non-sticky and anti-sticky at room temperature. It is straightforward to function. After hot pressing under positive conditions, it will purpose fusion bonding and go-linking and curing, and emerge as absolutely obvious. The cured movie owns quite excessive mild transmittance, adhesion power, thermal balance, air tightness, and growing older resistance. The long-time period practice has proved that it has obtained quite pleasant results in solar cellular encapsulation and door use.
The cured EVA owns elastic ought
face up to atmospheric modifications, encapsulate the crystalline silicon cell institution, and integrate it with the top defensive material glass and the decrease protecting cloth TPT (polyfluoroethylene composite film), the usage of vacuum lamination generation to bond as an entire. On the alternative hand, it can grow the mild transmittance of the glass after being bonded to the glass and has a nice effect on the output of the sun mobile module.
The thickness of Eva is between 0.4mm-0.6mm, the surface is flat, the thickness is uniform, and it includes the crosslinking additive. According to the curing time, there are principal styles of Eva: speedy curing and conventional curing
Different Eva lamination method is unique
The Eva movie layer with a thickness of zero.Four-0.6mm with anti-ultraviolet additive, antioxidant, and curing additive is used because the sealing agent of solar cellular makes the sealing and bonding among Eva, glass, and TPT. The Eva used to encapsulate silicon sun cellular modules is specially decided on primarily based on mild transmittance and climate resistance.
Different temperatures have a noticeably huge effect on the proportion of move-linking of EVA, and the percentage of go-linking EVA without delay affects the performance and provider existence of the module.
Unmodified EVA how thick should eva solar film be for module
is an obvious, soft,hot-soften adhesive, with low melting temperature and top soften fluidity. However, it has terrible warmness resistance, smooth extension and coffee elasticity, low cohesive strength and creep resistance, and it is clear to provide thermal enlargement and contraction, to motivate the crystalline silicon how thick should eva solar film be for module mobile to interrupt and motivate the adhesion to delaminate.
Therefore, EVA is changed via chemical go-linking. The technique is to feature an organic peroxide pass-linking agent to EVA. When EVA is heated to a certain temperature, the go-linking agent decomposes to generate loose radicals, which triggers the EVA molecules.
The aggregate of EVA paperwork
is a 3-dimensional community shape, which ends up in the go-linking and curing of the EVA adhesive layer.
Principle of determining the diploma of move-linking
The uncrosslinked EVA in the pattern is extracted via xylene, and the remaining undissolved substance is the crosslinked EVA. Assuming that how thick should eva solar film be for module the entire amount of the sample is W1 and the weight of the undissolved substance is W2, then the share of crosslinking of EVA