How are polycrystalline silicon solar panel components composed?

1. Tempered glass is used to protect the main body of power generation (such as battery cells). There are requirements for its selection of light transmission.

1.1 The light transmittance must be high (generally above 91%)

1.2.Super white tempered treatment

2. EVA is used to bond and fix tempered glass and the main body of power generation (such as battery cells). The quality of the transparent EVA material directly affects the life of the component. EVA exposed to the air is prone to aging and yellowing, thus affecting the light transmittance of the component. This affects the power generation quality of the module. In addition to the quality of EVA itself, the lamination process of the module manufacturer also has a great impact. For example, if the EVA bonding degree is not up to standard, and the bonding strength between EVA, tempered glass, and backplane is insufficient, it will cause premature aging of EVA. , affecting component life.

3. The main function of cells is to generate electricity. The mainstream in the power generation market are crystalline silicon solar cells and thin film solar cells. Both have their own advantages and disadvantages. Crystalline silicon solar cells have relatively low equipment costs, but the consumption and cell costs It is very high, but the photoelectric conversion efficiency is also high. Thin film solar cells are more suitable for generating electricity under outdoor sunlight. The relative equipment cost is high, but the consumption and battery costs are very low. However, the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but weaker. The light effect is very good and can generate electricity under ordinary light, such as the solar cells on calculators.

4. EVA functions as above, mainly bonding and encapsulating the power generation body and the backplane.

5. The function of the backplane is to seal, insulate and waterproof (usually TPT, TPE and other materials are used and must be resistant to aging. Most component manufacturers have a 25-year warranty. Tempered glass and aluminum alloy are generally no problem. The key lies in the backplane and silicone. Whether it can meet the requirements.

6. Aluminum alloy protects laminated parts and plays a certain sealing and supporting role.

7. The junction box protects the entire power generation system and plays the role of a current transfer station. If a component is short-circuited, the junction box automatically disconnects the short-circuited battery string to prevent burning of the entire system. The most critical thing in the junction box is the selection of diodes. According to the battery slices in the component Different types have different corresponding diodes.

8. Silicone sealing function is used to seal the junction between components and aluminum alloy frames, components and junction boxes. Some companies use double-sided tape and foam to replace silica gel. Silicone is commonly used in my country. The process is simple, convenient, easy to operate, and low-cost. Very low.