Solar modulesUsually composed of solar cell chips, backsheets,Adhesive filmand glass, etc. In photovoltaic cell manufacturing, encapsulation film is a crucial process that directly affects the performance and life of photovoltaic modules.
Next, Xiao Ai will explain the photovoltaic encapsulation film in detail for everyone!
OnePhotovoltaic encapsulant filmAreas of application
Photovoltaic power station
Photovoltaic power plants areMost commonone of the photovoltaic application fields. Adhesive film encapsulation is used to protect photovoltaic cell modules, improve their stability and life, and thusincreaseof photovoltaic power plantsPower generation efficiency
Building-integrated photovoltaics
By integrating photovoltaic modules into the buildingfacadesroofand other parts, the adhesive film not only provides protection, but also ensuresTransparency, allowing light to penetrate and allowing the building to perform photovoltaic functions while maintaining an aesthetically pleasing appearance.
Portable photovoltaic equipment
Adhesive film encapsulation is widely usedSolar chargersPower bankWait. These devices require a thin, flexible adhesive film to ensure that the equipment'sLightnesswithDurability
Agricultural photovoltaics
In the agricultural sector, photovoltaic cell modules are often used:Irrigation systemGreenhouseand other occasions. Adhesive film encapsulation provides protection in these environments while ensuring that light passes through for agricultural productionRenewable energy is available
Photovoltaic cars
Applied to:Electric vehicleswithSolar-powered vehicles, adhesive filmLightnesswithWeather resistanceSolar charging systems on the surface of automobiles are crucial.
Residential photovoltaic systems
In domestic applications, residential PV systems often include photovoltaic cell modules, which are protected by adhesive film encapsulationExtend its service life
IIPhotovoltaic encapsulant filmmanufacturing process
Substrate selection
Choose the substrate that is suitable for photovoltaic packaging.
Add additives
Add additives that can improve the performance of the adhesive film.
Coating
The blended adhesive film material is applied to the surface of the solar cell chip by coating machinery.
Curing
This is usually done by thermal or ultraviolet curing.
Pressing
The cured adhesive film is bonded to other components (e.g. glass, backplane, etc.) by a lamination process.
Shear
The PV encapsulant film is cut to match the size of the PV cell module.
Testing and quality control
The manufactured photovoltaic encapsulation film is tested to ensure that its performance meets the requirements.
IIICommon photovoltaic encapsulant film materials
EVA (ethylene vinyl acetate).
EVA is currentMost commonly usedOne of the photovoltaic encapsulant films. It has good transparency, electrical properties and mechanical strength, but it is sensitive to moisture and is prone to aging.
POE (polyolefin elastomer).
POE is a new type of adhesive film material that has:Good moisture resistance and weather resistance, which is gradually being applied in photovoltaic packaging.
TPU (thermoplastic polyurethane).
TPU is another new type of adhesive film material, with:Good flexibility and anti-aging propertiesIt is suitable for some application scenarios with high requirements for adhesive film.
TPT (polyester film).
TPT adhesive film has certain advantages over EVA in terms of moisture resistance, but itsLight transmittancewithElectrical conductivityRelativelyPoor
FourthPhotovoltaic encapsulant filmCommon problems and solutions
Moisture sensitivity
Traditional EVA adhesive film is prone to moisture absorption, resulting in an increase in moisture content inside the adhesive film, which affects the stability and life of battery modules.
Add anti-moisture additivesIt can effectively reduce the sensitivity of the adhesive film to moisture.
Photoaging
Photovoltaic modules are prone to photoaging under long-term sunlight exposure, resulting in a decrease in the transparency and mechanical properties of the adhesive film.
Anti-UV additives are addedIt can slow down the photoaging process.
Battery thermal runaway
Due to the limited thermal conductivity of the encapsulation film, photovoltaic cells are prone to thermal runaway in high-temperature environments, which affects the stability of the system.
Introduction of high thermal conductivity additivesIt can improve the thermal conductivity of the adhesive film.