Solar photovoltaic module battery assembly process:
Front side welding: The bus bar is welded to the main grid line of the front side (negative electrode) of the battery. The bus bar is a tinned copper strip. The welding machine can spot weld the strip on the main grid line in multiple points. The heat source for welding is an infrared lamp (using the thermal effect of infrared rays). The length of the ribbon is approximately twice the length of the side of the battery. The extra solder ribbon is attached to the back electrode of the rear cell when soldered on the back side.l profile manufacturers
Battery test: Due to the randomness of the production conditions of the battery, the performance of the produced battery is not the same. Therefore, in order to effectively combine the batteries with the same performance or similar performance, the battery should be classified according to its performance parameters; The battery is sorted by testing the output parameters (current and voltage) of the battery. In order to improve the utilization rate of the battery, a qualified battery assembly is produced.
Binding: similar to attaching a frame to the glass; attaching an aluminum frame to the glass component to increase the strength of the component, further sealing the battery component and prolonging the service life of the battery. The gap between the bezel and the glass component is filled with silicone resin. Each frame is connected by a corner key.
Solder junction box: solder a box at the back of the assembly to facilitate the connection between the battery and other equipment or batteries.
High-voltage test: High-voltage test refers to applying a certain voltage between the component frame and the electrode lead to test the pressure resistance and insulation strength of the component to ensure that the photovoltaic component is not damaged under the harsh natural conditions (lightning strike, etc.).
Component testing: The purpose of the test is to calibrate the output power of the battery, test its output characteristics, and determine the quality level of the component.
back series: back welding is to connect 36 batteries in series to form a component string, the current process is manual, the battery is mainly positioned by a membrane board, there are 36 grooves on the top of the battery The size of the slot corresponds to the size of the battery. The position of the slot has been designed. Different specifications of the components use different templates. The operator uses the soldering iron and solder wire to solder the front electrode (negative) of the “front battery” to the back. On the back electrode (positive electrode) of the battery, 36 pieces are sequentially connected in series and the leads are soldered to the positive and negative electrodes of the component string.
Laminated laying: After the back side is connected in series and passed the inspection, the component string, glass and cut EVA, glass fiber and backing board are laid according to a certain level, ready for lamination. The glass is coated with a layer of reagent to increase the bond strength between the glass and the EVA. When laying, ensure the relative position of the battery string and glass and other materials, adjust the distance between the batteries, and lay the foundation for lamination.
Photovoltaic module lamination: Put the laid battery into the laminating machine, evacuate the air in the assembly by vacuuming, and then heat to fuse the EVA to bond the battery, glass and back sheet together; finally cool the removal assembly c profile steel manufacturers. The lamination process is a key step in the production of components, and the lamination temperature lamination time is determined by the nature of the EVA. When using fast curing EVA, the lamination cycle time is approximately 25 minutes. The curing temperature was 150 °C.
Trimming: When the EVA is melted after lamination, it will be extended outward to form a burr due to the pressure, so it should be cut off after lamination.