The solar panel processing technology is an important part of the solar photovoltaic industry chain. By packaging thin solar cells one by one, it can operate reliably in harsh outdoor environments.

At present, the packaging form adopted by the mainstream solar panel processing technology is EVA adhesive film packaging, which is composed of solar panel detection, solar panel single welding, solar panel series welding, solar panel lay up, solar panel lamination, installation frame and junction box, finished product testing, packaging, and warehousing, etc. Each process is closely linked. Therefore, the process level of each process directly affects the quality and grade of products.

Processing technology of solar panel

The first process is solar cell detection. As the main raw material of solar panel processing, the performance of solar panels directly determines the quality of the solar panels. Therefore, in addition to its appearance, color difference, and resistivity, it is also necessary to test the output current, output voltage, stability, and durability of solar panels under specific light and temperature conditions, Its testing is mainly completed by professional instruments and equipment.

The second process is the single-chip welding of solar cells. When welding, pinch and press one end of the welding strip with your left hand, place the welding strip flat on the main grid line of the solar cell, and the other end of the welding strip contacts the grid line on the solar cell; Hold the soldering iron in your right hand and gently press weld along the welding strip with force from left to right.

During welding, the starting point of the soldering iron head shall be on the left of the single piece, and the plane of the soldering iron head shall always be close to the welding strip. The welding shall be firm, free of burrs, false welding, and tin slag, and the surface shall be smooth and beautiful.

The third process is the series welding of solar cells. The operation process is as follows: arrange the specified number of welded solar cells on the template with the back upward, gently press the two solar cells with one hand to make them stick on the heating template and close to each other, and press and weld the solder strip from the latter solar cell on the back electrode of the previous solar cell with a soldering iron according to the specified spacing (2 ± 0.5 mm). During welding, it is required that the solder strip shall be welded flat, straight in appearance, without raised solder bumps and false welding.

The fourth process is stacking. Lift the toughened glass onto the laminated workbench, with the pile surface of the toughened glass facing upward, and lay a layer of EVA on the toughened glass. The margin of EVA on the four sides of the toughened glass is ≥ 5mm; Note that the smooth surface of EVA shall face the pile surface of tempered glass.

Place the positioning template conforming to the solar panel type on the EVA. The solar cell string corresponds to the head and tail templates respectively. Correctly place the solar cell string on the EVA according to the positive and negative symbols marked on the template, and the antireflection film of the solar cell string faces down.

After the solar cell string is placed in place, measure the distance between the solar cells with a steel ruler according to the drawing requirements and positioning template, and adjust the position of the solar cell string.

Correctly weld the bus bar according to the solar cell panel splicing drawing and voltage requirements, and stick the bar code on the specified position.

Lay EVA with its suede facing the solar cell string, and then lay TPT. Conduct El test to confirm that there are no defects such as hidden crack, false welding, desoldering and black chip.

The fifth process is lamination. Start the laminator according to the operating procedures of the laminator equipment, adjust the lamination temperature and evacuation time according to the EVA characteristics, and record the temperature, pressure, and other technical parameters on the operation record sheet;

Put a layer of high-temperature non-stick cloth on the heating plate in the laminator, send the spliced tempered glass of the solar panel down to the middle of the heating plate of the laminator, then put a layer of high-temperature non-stick cloth, press the cover closing button, and the laminator enters the automatic control system.

When the lamination is completed, the laminator will automatically open the cover and take out the processed solar panel in time. The chip in the solar panel is required to be free of foreign matters, fragments, cracks, etc.

The sixth process is framing. Put silica gel evenly in the aluminum alloy frame groove, insert the solar panel into the aluminum alloy groove, and start the framing machine to complete the framing. Apply silica gel evenly at the junction of TPT and aluminum alloy on the back of the solar panel, apply silica gel evenly around the back of the junction box and the root of the outgoing line of corresponding specifications, stick the junction box, and connect the lead into the junction box.

Cure at room temperature and humidity. requirement: the frame shall be installed smoothly without bending, the gap at the right angle connection of aluminum alloy shall be 0.2mm, and the error of two diagonal lines of aluminum alloy frame shall be less than 4mm.

The seventh process is cleaning. Tear off the plastic film on the surface of the aluminum profile, and clean various pollutants on the surface of the solar panel with wine semen to ensure that the appearance of the solar panel is clean and pollution-free.

The eighth process is the test of finished solar panels. Test according to the operating procedures of the solar panel tester. Firstly, calibrate the solar panel tester with standard solar panels in the same environment, make calibration records, put the solar panel to be tested, connect the positive and negative electrodes, test the solar panel, and calculate the electrical performance parameters of the solar panel through comparison and analysis, And make records.