Module line is also called encapsulation line, encapsulation is a key step in the production of solar cells, no good encapsulation process, how good the battery can not produce a good module board. The encapsulation of the battery not only ensures the life of the battery, but also enhances the impact strength of the battery. The high quality and life of the product is the key to win the satisfaction of the customer, so the quality of the encapsulation of the component board is very important.
The process is as follows:
1, battery testing - 2, front welding - inspection - 3, back stringing - inspection - 4, laying (glass cleaning) material cutting, glass pretreatment, laying) - 5, lamination - 6, deburring (deburring, cleaning) - 7, frame (glue, corner keys, punching, framing, scrubbing Residual glue) - 8, welding junction box - 9, high-voltage test - 10, component testing - appearance inspection -11, packaging and warehousing;
1.2 Process Introduction:
Here is only a brief introduction to the role of the process, to give you a perceptual understanding of the specifics later in the details:
1, battery testing: due to the randomness of the battery cell production conditions, the performance of the battery produced is not the same, so in order to Effective performance of the same or similar battery grouped together, so it should be categorized according to its performance parameters; battery test that is, by testing the size of the output parameters of the battery (current and voltage) for its classification. In order to improve the utilization rate of the battery, to make the quality of qualified battery components.
2, Positive welding: is to weld the converging strip to the front of the battery (negative) on the main grid line, the converging strip is tinned copper tape, we use the welding machine can be welded in the form of multi-point welding strip on the main grid line. The heat source for welding is an infrared lamp (utilizing the thermal effect of infrared rays). The length of the strip is approximately twice the length of the battery side. The extra tape is connected to the back electrode of the cell behind it during backside welding. (Our company uses manual welding)
3, the back of the string: the back of the welding is the 36 pieces of batteries together to form a component string, we are currently using the process is manual, the positioning of the battery mainly rely on a film with a board, there are 36 grooves placed in the battery sheet, the size of the groove and the size of the battery corresponds to the location of the groove has been designed, different specifications of the component using different The template, the operator uses a soldering iron and soldering wire to "front battery" front electrode (negative) welded to the "back battery" back electrode (positive), so that the 36 pieces of string together and in the components of the string of positive and negative welding out of the lead.
4, lamination laying: the back of the string is connected and after inspection, the component string, glass and cut EVA, glass fiber, backplane in accordance with certain levels of laying, ready to laminate. The glass is coated with a layer of reagent (primer) to increase the adhesive strength of glass and EVA. Ensure that the relative position of the battery string and the glass and other materials when laying, adjust the distance between the batteries, to lay a good foundation for the lamination. (Laying level: from the bottom up: glass, EVA, battery, EVA, fiberglass, backplane).
5, component lamination: the laying of the battery into the laminating machine, through the vacuum will be components of the air out, and then heated so that the EVA melting battery, glass and backplane bonded together; finally cooled to remove the components. The lamination process is a critical step in the production of the module. The lamination temperature and time are determined by the nature of the EVA. When we use fast curing EVA, the lamination cycle time is about 25 minutes. The curing temperature is 150°C.
6, trimming: lamination of EVA melting due to the pressure to extend the curing outward to form a burr, so the lamination should be removed.
7, framing: similar to the glass to install a frame; to the glass component aluminum frame, increase the strength of the component, further sealing of the battery components, to extend the service life of the battery. The gap between the frame and the glass component is filled with silicone resin. Each bezel is connected to each other with an angle key.
8. Welding junction box: Weld a box on the back of the module at the lead wire to facilitate the connection between the battery and other equipment or batteries.
9, high-voltage test: High-voltage test refers to applying a certain voltage between the module frame and electrode leads to test the voltage resistance and insulation strength of the module to ensure that the module will not be damaged under harsh natural conditions (lightning strikes, etc.).
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.