The following gives the contents of a company’s photovoltaic module lamination repair work instructions for understanding the repair methods of defective laminate products.
1. Personnel requirements
1). The production staff must be familiar with the entire operation process of this process before the formal production operation.
2). The production staff must strictly wear work clothes, work caps, and high-temperature gloves before work. There is no wear standard, work is not allowed, and no direct contact with the electric bubble sheet is allowed.
3). Production staff should concentrate and operate carefully during operation. Don’t play, close, chat, and don’t do things that have nothing to do with work.
4). Fill in the repair form as required, and fill in the repair materials and reason for repair.
2. Production environment requirements
1). The temperature of the production environment is required to be 23℃±1℃, and the humidity is not more than 75%.
2). The repair table should be kept clean and tidy, and there is no ash, residual EVA and other debris on it.
3). The repair area should be cleaned up.
4). Prepare the steel ruler, high temperature tape, dust-free cloth, alcohol spray board, stage, scissors, utility knife, soldering pen, industrial glue, plastic wrap, rice, tiger error, sharp mouth error, Shovel, marker, eraser, air gun. The temperature of the soldering station is normal (350℃±5℃).
3. Operating procedures
1). After visual inspection and EL test, determine the location of the cell to be repaired and make a record.
2). Turn on the power of the repair station, set the temperature (130°C~135°C), and perform preheating.
3). After the temperature rises to the set temperature. Place a piece of high-temperature cloth under the repairing table to round the corners, and then place a component to be repaired on the high-temperature cloth, with the tempered glass side facing down, and a piece of high-temperature cloth at right angles on top of the component. The components to be reworked should be placed on the workbench where the voltage level is tested, turn on the power switch, and use the tool knife to move at a constant speed along the light-transmitting part of the component to cut the backplane into strips. Put on the upper cover of the rework station. After heating for 10 minutes, remove the cover and the cover cloth above the components.
4). Use a vise to clamp a corner of the component belt plate and drag it forward at a constant speed until the back plate is completely off. Repeat the above steps until the remaining backplane is completely peeled off. Note: The speed should be slowed down at the corners of the battery to prevent damage to the battery due to excessive force covering the belt plate.
5). Turn off the power supply of the repair station, slide the blade along the edge of the battery slice at a constant speed, mark out the damaged battery slice and the EVA glued on it, and then use a spatula to shovel away the damaged battery slice along the corners of the electric bubble. Pay attention to the connected tin-coated tape under the window, and then use a rubber and dust-free cloth to clean the excess EVA on the tempered glass, clean up the carvings on the EVA, and clean up the places with empty glue and excess glue. Replace the bent bus bar and check if it has a barcode.
6). In the damaged battery area, cut two pieces of EVA according to the size of the area, place a piece of EVA underneath, and then spread the high-temperature cloth for soldering tin-coated tape on it, take the battery piece, check it, and place it. Place it on a high-temperature cloth, first use a soldering iron to clean the EVA on the tin-coated tape on the part of the battery to be repaired that needs to be welded, then apply flux to the tin-coated emperor, and start welding according to the string welding process. Repeat the above steps to repair the remaining cells (EVA, cell, tube sheet, wrong zero coating, art glue, high-temperature masking and component raw materials have the same model and size specifications).
7). Cover the battery with another cut piece of EVA, supplement the remaining empty parts with cut EVA, add EVA to the place where the high temperature tape is attached, then cover a whole piece of EVA, and then cover The back plate is fixed with art glue.
8). Check the appearance. If you need to replace the battery after the EL test, repeat the above steps to repair it, and then put it into the laminator to laminate. If the appearance inspection is correct after lamination, the next rework board is laminated (reference for lamination parameters: the table temperature is 135℃, the same is 420s when vacuuming, the lamination time is 660%, and the pressure is 0.01-
0.02MPa).
4.Matters needing attention
1). After the component is repaired and the back plate is removed, if the repair is not completed on the same day, the components to be repaired should be covered with plastic wrap. Prevent dust and dirt from sticking to the components.
2). When removing the EVA of the components to be repaired, the plowing corners should be cleaned into rounded corners.
3). In the transportation and repair of components, prevent the corners of the toughened glass from colliding with hard objects and causing the components to be scrapped.
When components require EL testing and appearance inspection, the turnover cart should be used for turnover.