What are the processes for producing battery shrapnel
1. Battery shrapnel test: Due to the randomness of the battery production conditions, the performance of the batteries produced is not the same. Therefore, in order to effectively combine the batteries with the same or similar performance, they should be classified according to their performance parameters; battery testing That is, the battery is classified by the size of its output parameters (current and voltage). In order to improve the utilization rate of the battery, make the battery assembly of qualified quality.
2. The front side welding of the battery shrapnel: is to weld the bus strap to the main grid line of the front side (negative electrode) of the battery. The bus strap is a tin-plated copper tape. On the main grid. 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 battery side. The extra solder ribbon is connected to the back electrode of the back cell when the back side is welded. (Our company uses manual welding)
3. The back side of the battery shrapnel is connected in series: the back side welding is to connect 36 batteries in series to form a component string. The process we currently use is manual. The positioning of the battery is mainly based on a membrane board with 36 batteries on it. The size of the groove corresponds to the size of the battery. The position of the groove has been designed. Different specifications of components use different templates. The operator uses an electric soldering iron and solder wire to weld the front electrode (negative electrode) of the "front battery" To the back electrode (positive electrode) of the "back battery", connect 36 pieces in series and weld the leads on the positive and negative electrodes of the module string.
4. Laminating the battery shrapnel: After the back is connected in series and passed the inspection, the module string, glass, cut EVA, glass fiber, and backplane are laid in a certain level, ready to be laminated. The glass is coated with a primer in advance to increase the bonding strength between the glass and EVA. When laying, ensure the relative position of the battery string and glass and other materials, adjust the distance between the batteries, and lay a good foundation for lamination. (Laying level: from bottom to top: glass, EVA, battery, EVA, glass fiber, backplane).
5. Battery shrapnel module lamination: Put the laid battery into the laminator, draw out the air in the module by vacuuming, and then heat to melt the EVA to bond the battery, glass and back plate together; cool to take out the module . The lamination process is a key step in component production, 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.
6. Edge trimming of battery shrapnel: After the EVA melts during lamination, it will extend and solidify to form burrs due to pressure, so it should be cut off after lamination.
7. Battery shrapnel framing: similar to installing a mirror frame for the glass; installing an aluminum frame for the glass component to increase the strength of the component, further seal the battery component, and prolong the service life of the battery. The gap between the frame and the glass component is filled with silicone resin. Use corner keys to connect each frame.
8. Welding junction box of battery shrapnel: Weld a box at the lead on the back of the module to facilitate the connection between the battery and other devices or batteries.
9. High-voltage test of battery shrapnel: High-voltage test refers to applying a certain voltage between the component frame and the electrode lead to test the voltage resistance and insulation strength of the component to ensure that the component is not damaged under harsh natural conditions (lightning strikes, etc.).
10. Battery shrapnel component test: 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.