Encapsulation is a key step in the production of solar cells. Without a good encapsulation process, no good battery can produce a good module board. The encapsulation of the battery not only ensures the life of the battery, but also enhances the battery's anti-strength. The high quality and long life of the product are the key to customer satisfaction, so the packaging quality of the module board is very important.
1. Battery inspection-2. Front welding-inspection-3. Back series connection-inspection-4. Laying (glass cleaning, material cutting, glass pretreatment, laying)-5. Laminating-6. Deburring ( Edge removal, cleaning)-7. Frame mounting (gluing, corner keying, punching, framing, scrubbing the remaining glue)-8. Welding junction box-9. High voltage test-10. Component test-Appearance Inspection—11. Packing and warehousing
How to ensure the high efficiency and long life of components:
1, high conversion efficiency, high-quality solar cells;
2. High-quality raw materials, such as high cross-linking EVA, high bonding strength encapsulant (neutral silicone resin glue), high light transmittance and high strength tempered glass, etc.;
3, reasonable packaging process
4. Rigorous work style of employees;
As solar cells are high-tech products, some detailed problems in the production process, some inconspicuous problems such as gloves should not be worn, reagents should be evenly applied and scribbled, etc. are the enemies that affect product quality, so in addition to formulating reasonable In addition to the production process, the staff’s earnestness and rigor are very important.
Introduction to the assembly process of solar cells:
Introduction to craftsmanship: I will only briefly introduce the function of craftsmanship here to give you a perceptual understanding.
1. Battery test: Due to the randomness of the cell production conditions, the performance of the batteries produced is not the same, so in order to effectively combine the batteries with the same or similar performance, they should be classified according to their performance parameters; the battery test 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 qualified battery components.
2. Front welding: Weld the busbar to the main grid line on the front (negative) of the battery. The busbar is tinned copper tape. The welding machine we use can spot-weld the ribbon on the main grid in the form of multiple points. on-line. 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 ribbon is connected to the back electrode of the back cell when the back side is soldered
3. Backside series connection: The backside 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 recesses for placing the battery. The size of the slot corresponds to the size of the battery. The location of the slot 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 " On the back electrode (positive electrode) of the “back battery”, in this way, 36 pieces are connected in series and lead wires are welded to the positive and negative electrodes of the module string.
4. Laminating: 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. 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 backplane together; finally cool and 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. Trimming: When EVA melts during lamination, it will extend and solidify to form burrs due to pressure, so it should be cut off after lamination.
7, framing: similar to installing a mirror frame for the glass; installing an aluminum frame for the glass assembly to increase the strength of the assembly, further sealing the battery assembly, and prolonging 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: 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: 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. 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.