The first step: cell inspection
The cell inspection process is an electronic current-voltage measurement system used to identify the performance of photovoltaic cells. The tester uses a variety of current and voltage combinations to sample the cell under the variable impedance power generation. The performance of the cell depends on the measured data of the output current-voltage relationship when it is illuminated by light. This relationship is called the "current-voltage curve" and can be obtained by exposing the cell to a constant level of light source and changing its external impedance to change the cell's current-voltage value. Creating a current-voltage curve requires multiple current-voltage point data, and an external trigger function device can be used with the pulse solar simulator. This allows the tester to create multiple continuous pulses (usually 10-100 selection points) to complete the current-voltage curve measurement, generally input 100V~240VAC, 50/60Hz. A PC computer needs to be used as a controller to control this current-voltage measurement system.
Step 2: Weld the cells into strings
The manual stringing procedure requires a stringing station. A stringing station has two working positions. The stringing station is equipped with a heated welding plate, which can reduce the heat tension caused during the welding process. The string welding technique is compact and coordinated and does not require more external space. Cells of different specifications can be welded on the stringing station.
The third step: component layering
Manual component layering process: After the cells are connected in strings, they are moved and placed on a light table that can test their electronic performance. At this stage, it is also checked whether there are problems between the cell connections.
Then, the
battery slices are placed in series on a board that has been covered with a sealing film, and then another sealing film and a TPT film are covered on it. The next step is to use laminating equipment to merge all the layers together.
Step 4: Laminating procedure
The automatic laminating process requires a laminator equipment that manufactures the heart of each solar module. During the lamination process, the series-welded cells are sealed between a glass plate and the TPT or between two glass plates under vacuum conditions at a temperature of 150 °C. In this process, it is most important to ensure the same heating temperature for each layer area. If the temperature between the areas is different, even a few degrees difference will cause the danger of uneven adhesion of the sealing material, which will cause the components to be used The consequences of being infiltrated by water after a period of time, such as use on the roof, may result in the need to replace new components.
After lamination, under the set pressure, the components are cooled in the cooling box, and the pressure will ensure a better edge sealing effect.
The laminator is compact and easy to monitor, and does not require additional external equipment such as vacuum pumps or heaters. The control panel makes the program setting of the whole process flexible and can be fully controlled.
