The white strip is the backing of the solder tape used to connect the cells in series. She plays a leading role. The main component is copper.
The resistivity should be low. of the component is too large, its cost performance will be greatly reduced through the welding process, the electrodes (current) of the battery cells are derived, and then the output electrodes are effectively connected to the junction box in series or in parallel. Connection. Welding tape is an important raw material in the welding process of photovoltaic modules. The quality of the soldering tape depends on the quality of the soldering tape. It will directly affect the current collection efficiency of photovoltaic modules and have a great impact on. the power of photovoltaic modules. The general standard for the selection of welding tapes is to determine the thickness of the welding tape based on the thickness of thebattery sheet and the amount of short circuit current. The width of the welding tape should be consistent with the width of the main wire. battery. The softness and hardness of welding tape generally depends on the thickness of the battery sheet and welding tools.
1. Battery test: Due to the randomness of battery cell production conditions, the performance of the produced batteries is not the same, in order to effectively combine batteries with coherent or coherent batteries. similar performance, classification is based on its performance parameters; Battery testing is to classify the battery by testing its output parameters (current and voltage). In order to improve the utilization rate of batteries and manufacture qualified quality battery components.
2. Front soldering: The bus strip is soldered to the main gate line on the front sideof the battery (negative electrode). The bus strip is a tin-plated copper strip. the strip at several points. The shape is spot welded to the main grid line. The heat source used for welding is an infrared lamp (using the thermal effect of infrared rays). The length of the welding tape is approximately twice the side length of the battery. The extra welding tape is connected to the back electrode of the next battery part during back welding. (Our company uses manual welding)
3. Back-end series connection: Back-end welding involves connecting 36 batteries together to form a chain of components. The process we currently use is manual. The positioning of the battery mainly depends. on a membrane plate with 36 grooves to place the battery cells. The size of the grooves corresponds to the size of the battery. The groove positionsres were designed for components of different specifications. and The welding wire welds the front electrode (negative electrode) of the "front battery" to the rear electrode (positive electrode) of the "rear battery", thereby connecting the 36 parts together in series and the welding wires to the positive and negative electrodes. of the component chain.
4. Laying Laminate: After the back side is connected in series and passed inspection, the component chains, glass and cut EVA, fiberglass and back panel are laid at certain levels and prepared for lamination. The glass is pre-coated with a layer of primer to increase the bonding strength between the glass and the EVA. When laying, ensure the relative position of the battery string, glass and other materials, and adjust the distance between batteries to establish a solid foundation for lamination. (Installation level: from bottom to top: glass,EVA, battery, EVA, fiberglass, backplane).
5. Component lamination: put the laid battery into the laminator, suck the air into the component, then heat to melt the EVA and connect the battery, glass and backplane together; the group parts. The lamination process is a key step in the production of components. The lamination temperature and time are determined by the properties of the EVA. When we use fast curing EVA, the lamination cycle time is about 25 minutes. The curing temperature is 150°C.
6. Cutting: During rolling, EVA melts and solidifies outward due to pressure to form burrs, so it needs to be removed after rolling.
7. Framing: Similar to installing a frame on glass; installing aluminum frames on glass components increases the strength of the components, further seals thebattery components and extends battery life. The gaps between the frame and the glass components are filled with silicone resin. Each image is connected to corner keys.
8. Solder Junction Box: Solder a box at the wire to the back of the component to facilitate connection between the battery and other equipment or batteries.
9. High voltage test: High voltage test refers to the application of a certain voltage between the component frame and the electrode wire to test the voltage resistance and insulation strength of the component to ensure that the component can withstand. harsh natural conditions (lightning, etc.) are not damaged.
10. Component Testing: The purpose of testing is to calibrate the battery's power output, test its output characteristics, and determine the quality level of the component.