What are the main raw materials for PV modules? The structure of the solar cell module and the functions of each part:
1) Tempered glass
Its role is to protect the main body of power generation (such as battery sheets), the choice of light transmission is required: 1 light transmittance must be high (generally 91% or more); 2 ultra-white steel treatment.c profile steel suppliers
2) Battery chip
The main role is to generate electricity. The mainstream of the main power generation market is crystalline silicon solar cells and thin film solar cells. Both have superior and inferior crystalline silicon solar cells. The equipment cost is relatively low, but the cost of consumption and cell is high. However, the photoelectric conversion efficiency is also high. It is more suitable for thin-film solar cells in outdoor sunlight. The relative equipment cost is high, but the consumption and battery cost are very low, but the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but the weak light effect is very Well, photovoltaic modules can also generate electricity under ordinary lighting, such as solar cells on a calculator.
3) Junction box
Protect the entire power generation system and act as a current transfer station. If the short-circuit junction box automatically disconnects the short-circuit battery string, the most critical factor in preventing the burnout of the entire system junction box is the choice of diodes. Depending on the type of battery in the module, The corresponding diodes are also different.
Sealing function, used to seal components and aluminum alloy frame, components and junction box junctions Some companies use double-sided tape, foam to replace silica gel, silicone is commonly used in China, the process is simple, convenient, easy to operate, and the cost is very low.
Function, sealing, insulation, waterproof (usually TPT, TPE and other materials must be resistant to aging, most components manufacturers are guaranteed for 25 years, tempered glass, aluminum alloy is generally no problem, the key is whether with the backboard and silica gel Meet the requirements).z profile steel
6) Aluminum alloy
The laminate is protected to provide a certain sealing and supporting function.
Used to bond fixed tempered 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 air is prone to aging and yellowing, thus affecting the transmittance of the component and thus affecting In addition to the quality of the EVA itself, the component manufacturer’s lamination process is also very large. If the EVA glue is not up to standard, the adhesion strength of EVA and tempered glass and back sheet will not cause premature aging of EVA. Component life.
8) EVA acts as above, mainly bonding and encapsulating the power generating body and the backboard.