1. Battery testing: Due to the randomness of battery production conditions, the performance of the produced batteries is not the same. In order to effectively combine battery packs with the same or similar performance, they should be classified according to their performance parameters; battery testing is to classify them by detecting the size of battery output parameters (current and voltage). This can improve the utilization rate of the battery and make it a qualified battery component.<\/p>\n
2. Positive electrode welding: It is to weld the sedimentation belt to the main grid line on the front (negative) side of the battery. The sedimentation belt is tinned copper. We can use a welding machine to weld it to the main grid line in the form of multi-point spot welding. The heat source for welding is an infrared lamp (using the thermal effect of infrared light). The length of the belt is about twice that of the battery side. When welding on the back, the excess strip is connected to the electrode on the back of the battery. (Our company uses manual welding)<\/p>\n
3. Back-side series connection: Back-side welding is to connect 36 batteries together to form a component string. The process we currently use is manual operation. The positioning of the battery mainly relies on a thin film tool plate. There are 36 grooves placed on the battery cell. The size of the groove is related to the size of the battery. The position of the groove has been designed. Different sizes of components use different templates. The operator uses a soldering iron and solder wire to weld the front electrode (negative electrode) of the "front battery" with the rear electrode (positive electrode) of the "rear battery" together. In this way, the 36 pieces are connected in series, and the leads are welded to the positive and negative ends of the component string.<\/p>\n
4. Layered laying: After the backside is connected and checked, lay the component string, glass, cut EVA, glass fiber, and backplane in a certain layer and prepare for lamination. Apply a layer of reagent (primer) on the glass in advance to increase the bonding strength between 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 bonding. (Laying layers: from bottom to top: glass, EVA, battery, EVA, glass fiber, backplane).<\/p>\n
5. Component lamination: Place the laid-out cells in the laminator, extract the air from the components by vacuum, and then heat the EVA to bond the cells, glass, and backplane together to melt; remove the components after cooling. The lamination process is a key step in component production. The lamination temperature and time are determined by the properties of EVA. When we use fast-curing EVA, the lamination cycle is about 25 minutes. The curing temperature is 150\u00b0C.<\/p>\n
6. Trimming: The laminated EVA forms raw edges due to pressure and outward extension of solidification, so the laminated part should be removed.<\/p>\n
7. Frame installation: Similar to the frame for glass; the aluminum frame holds the glass assembly, increases the strength of the assembly, further seals the battery assembly, and extends the battery life. The gap between the frame and the glass assembly is filled with silicone. Each frame is connected with an angle key.<\/p>\n
8. Welding junction box: Weld a box at the back leads of the module to facilitate the connection between the battery and other devices or batteries.<\/p>\n
9. 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 component will not be damaged under harsh natural conditions (lightning strikes, etc.).<\/p>\n
10. 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.<\/p>","protected":false},"excerpt":{"rendered":"
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