EL defect detector, how to deal with damaged components detected

　　In the production process of photovoltaic modules, we will conduct EL defect detection and module appearance inspection on the photovoltaic modules before and after lamination. If a problem is detected with the battery module, we need to repair the photovoltaic module. Let's talk about the specific repair steps for photovoltaic modules after defects are found in production:

　　1. Defects were found before lamination, and faulty battery cells such as hidden cracks and solder joints were directly cleaned to create new ones. The new battery cells were soldered onto the entire component, and then EL defect detection (electroluminescence tester) was performed again. Laminate repair components and perform EL defect testing on photovoltaic modules again.

　　2. Repair steps for component defects found after lamination

　　1) Firstly, it is necessary to adjust the parameters of the laminating machine,

　　2) Remove the photovoltaic module frame;

　　3) Use a repair heating table to heat the components;

　　4) Peel off the back panel;

　　5) Remove defective battery cells;

　　6) Cutting EVA;

　　7) Replace with new battery cells;

　　8) Repair adhesive pits;

　　9) Use El defect detector to test the components;

　　10) Laminated repair components;

　　11) Install aluminum alloy frames for components

　　12) Use the El defect detector again to test the components;

　　12) Put the components that pass the test into the warehouse.

　　As is well known, the working principle of solar cells utilizes the photoelectric effect: when sunlight shines on the semiconductor p-n junction, new hole electron pairs are formed. Under the action of the p-n junction electric field, holes flow from the n region to the p region, and electrons flow from the p region to the n region. After the circuit is connected, a current is formed.

　　Solar cell modules are formed by bonding tempered glass, battery strings, and backplates together through EVA at high temperatures. The adhesive film used for packaging solar cell modules is made of EVA as the base material, supplemented by several modifiers, and hot-rolled into thin film products through film forming equipment. This product is a thermosetting hot melt adhesive film that undergoes cross-linking reaction when heated during the packaging process of solar cell modules. The cured adhesive film has a relatively high transmittance, adhesive strength, thermal stability, airtightness, and aging resistance. Components may experience battery fragmentation due to human or equipment factors after being laminated with EVA. Due to the series connection structure of battery cells in the entire module, broken battery cells can affect the power generation of the entire module. Therefore, if there are broken battery cells in the laminated components, they must be replaced or repaired before they can be used normally.

　　In component production, EL defect detectors are generally used, and most component defects cannot be observed by the naked eye. In this case, we need to use solar module EL defect detectors. Through the principle of electroluminescence, the defects of the components can be clearly displayed, and problems in production can be detected and eliminated in a timely manner, thereby improving average efficiency and efficiency.