Encapsulation
Encapsulation is a key step in the production of solar panels. The encapsulation of solar panels can not only ensure the life of the solar cells, but also enhance the resistance strength of the solar cells. The high quality and long life of the product are the keys to customer satisfaction, so the encapsulation quality of the solar panel is very important.
 
Process
1. Solar cell inspection - 2. Front welding - inspection - 3. Back series connection - inspection - 4. Laying (glass cleaning, material cutting, glass pretreatment, laying) - 5. lamination - 6. deburring (Edge removal, cleaning) - 7. Frame installation (gluing, framing, scrubbing the remaining glue) - 8. Welding junction box-9. High voltage test - 10. Solar module test-appearance inspection - 11. Packaging Warehousing

Solar cell test
Due to the randomness of the production conditions of solar cells, the performance of the produced solar cells is not the same. Therefore, in order to effectively combine solar cells with the same or similar performance, they should be classified according to their performance parameters; solar cell testing, namely By testing the output parameters (current and voltage) of solar cells to classify them, in order to improve the utilization rate of solar cells, and make solar cell modules of qualified quality.
 
Front welding
It is to weld the busbar to the main grid line of the front (negative) of the solar cell. The busbar is a tin-plated copper tape. The welding machine we use can spot weld the ribbon on the busbar in the form of multiple points. The heat source for welding is an infrared lamp (using the thermal effect of infrared rays). The length of the ribbon is about twice the length of the solar cell. The extra ribbon is connected to the back electrode of another solar cell during back welding
 
Back series connection
Back welding is to connect solar cells in series to form a solar module string. The process used is manual. The positioning of solar cells mainly depends on a mold plate with grooves for placing solar cells, the size of the slots and the size of solar cells. Correspondingly, the position of the slot has been designed. Solar modules of different specifications use different templates. The operator uses an electric soldering iron and solder wire to weld the front electrode (negative electrode) of the "front solar cell" to the back electrode of the "rear solar cell" (Positive), so that the solar cells are connected in series and the leads are welded to the positive and negative electrodes of the solar module string.
 
Laminated laying
After the back is connected in series and passed the inspection, the solar module string, glass, cut EVA, glass fiber, and backplane are laid in a certain level, ready to be laminated. When laying, ensure the relative position of solar cell string and glass and other materials, adjust the distance between solar cells, and lay a good foundation for lamination. (Laying level: from bottom to top: tempered glass, EVA, solar cells, EVA, glass fiber, backplane).
 
Solar module lamination
Put the laid solar cell into the laminator, draw out the air in the solar module by vacuuming, and then heat to melt the EVA to bond the solar cell, glass and back sheet together; finally cool and take out the solar module. The lamination process is a key step in the production of solar modules, and the lamination temperature and lamination time are determined by the properties of EVA. When we use fast curing EVA, the lamination cycle time is about 25 minutes. The curing temperature is 150°C.
 
Trimming
During lamination, the EVA is melted and extended and solidified due to pressure to form burrs, so it should be removed after lamination.
 
Frame
It is similar to installing a mirror frame for the glass; installing an aluminum frame for the glass module to increase the strength of the solar module, further sealing the solar cell module, and extending the service life of the solar cell. The gap between the frame and the glass component is filled with silicone resin. Use corner keys to connect each frame.
 
Welding junction box
Solder a box on the back of the module to facilitate the connection between the solar cell and other equipment or solar cells.
 
high-pressure test
High voltage test refers to applying a certain voltage between the solar module frame and the electrode lead to test the voltage resistance and insulation strength of the module to ensure that the module is not damaged under harsh natural conditions (lightning strikes, etc.).