The composition and functions of solar cell modules

1. Toughened glass, its function is to protect the main body of power generation (such as batteries), and there are requirements for the selection of light transmission:
a. The light transmittance must be high (generally above 91%);
b. Ultra-white tempered treatment.
2. EVA is used to bond and fix toughened glass and power generation main body (such as battery sheet). The quality of transparent EVA material directly affects the life of the component. EVA exposed to the air is prone to aging and yellowing, which affects the light transmittance of the component. , thus affecting the power generation quality of the module. In addition to the quality of EVA itself, the lamination process of the module manufacturer is also very important. For example, the degree of EVA bonding is not up to the standard, and the bonding strength between EVA and tempered glass and the back plate is not enough, which will cause EVA to be premature. Aging affects component life. It is mainly used for bonding and encapsulating the power generation main body and the backplane.
3. The main function of solar cells is to generate electricity. The mainstream of the power generation market is crystalline silicon solar cells and thin-film solar cells, both of which have their own advantages and disadvantages. Crystalline silicon solar cells have relatively low equipment cost and high photoelectric conversion efficiency. It is more suitable to generate electricity under outdoor sunlight, but the consumption and battery cost are high; thin-film solar cells have low consumption and battery cost, and the weak light effect is very Well, it can also generate electricity under ordinary light, but the relative equipment cost is relatively high, and the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, such as solar cells on calculators.
4. The role of the backplane, sealing, insulation, waterproof (generally TPT, TPE and other materials must be resistant to aging, most component manufacturers have a 25-year warranty, tempered glass, aluminum alloy are generally no problem, the key is the connection with the backplane and silica gel can meet the requirements.)
5. The aluminum alloy protective laminate plays a certain role in sealing and supporting.
6. The junction box protects the entire power generation system and acts as a current transfer station. If the component is short-circuited, the junction box automatically disconnects the short-circuited battery string to prevent the entire system from being burned out. The most critical thing in the junction box is the selection of diodes. Different types of battery slices have different corresponding diodes.
7. Silicone sealing function, used to seal the junction between components and aluminum alloy frame, components and junction box. Some companies use double-sided adhesive strips and foam to replace silica gel. Silica gel is widely used in China. The process is simple, convenient, easy to operate, and the cost is very low.