The photovoltaic backsheet is an important material located on the back of the photovoltaic module, which protects and supports the cell, and its performance has a great
impact on the performance and service life of the photovoltaic module.
In order to ensure the long-term reliability and durability of photovoltaic modules, the backsheet should have excellent weather resistance, electrical insulation, water vapor barrier, etc
Since the packaging structure of photovoltaic modules in the 80s of the 20th century, DuPont's "Tedlar" polyvinyl fluoride film (PVF) and PET composite molding PVF/PET/PVF (referred to as TPT) backsheet have become the preferred coating online coatingol.
for photovoltaic backsheets.
Due to PVF film supply constraints, companies such as 3M, Arkema, Solvay and others have developed alternative products such as polyvinylidene fluoride film (PVDF).
However, the composite fluorine-containing backplate prepared by other fluorine films is similar to the TPT backplate, which is basically made of fluorine film / adhesive / PET / adhesive / fluorine film 5-layer structure, in which adhesive and PET due to their own molecular composition, often have the shortcomings of moisture and heat aging, UV aging resistance, poor performance, become the weak link of the back plate, resulting in delamination and bubbles of the back plate during use, resulting in the battery sheet falling off and shifting, the effective output power of the battery decreases, and even leads to a fire in the component in severe cases
In response to the above problems, Chinese researchers have carried out research on the preparation of coated fluorine-containing backsheets with fluorine coatings, and Jolywood, Lucky and other companies have related products on the market
Due to the short time on the market of coated fluorine-containing backsheets, there are few comparative studies on the substitution of composite fluorine-containing backsheets in actual use, especially the key performance weather resistance, although there are reports of rapid laboratory comparison methods combining ultraviolet and humid heat aging, but they do not clearly explain the backsheet materials, and the possibility of direct reference in the industry is small
In this study, ultraviolet, humid heat and HAST experiments commonly used in the photovoltaic industry were used to compare the weather resistance of self-made coated fluorine-containing backsheet (backsheet A), commercially available composite TPT fluorine-containing backsheet (backplate B), and commercially coated fluorine-containing backsheet (backsheet C