12V27A battery.Solar cell production technology and production process

　　The module line is also called the packaging line. Packaging is a key step in the production of solar cells. Without a good packaging process, no matter how good the battery is, it will not be able to produce good module boards. The packaging of the battery not only ensures the life of the battery, but also enhances the battery's resistance strength. The high quality and long life of the product are the keys to winning customer satisfaction, so the packaging quality of the component board is very important.

　　Solar cell production process:

　　1. Battery inspection - 2. Front welding - inspection - 3. Back series connection - inspection - 4. Laying (glass cleaning, material cutting, glass pretreatment, laying) - 5. Lamination - 6. Deburring ( Edge removal, cleaning) - 7. Frame installation (gluing, corner key installation, punching, framing, scrubbing residual glue) - 8. Welding junction box - 9. High voltage test - 10. Component test - appearance Inspection—11. Packaging and storage

　　How to ensure high efficiency and long service life of components:

　　1. High conversion efficiency, high quality battery cells;

　　2. High-quality raw materials, such as: EVA with high cross-linking degree, encapsulant with high bonding strength (neutral silicone resin glue), tempered glass with high light transmittance and high strength, etc.;

　　3. Reasonable packaging process

　　4. Rigorous work style of employees;

　　Since solar cells are high-tech products, some details in the production process, some inconspicuous problems such as wearing gloves but not wearing them, applying reagents evenly and scribbling, etc., are the enemies of product quality. Therefore, in addition to formulating reasonable In addition to the excellent production technology, the seriousness and rigor of the employees are very important.

　　Introduction to solar cell assembly process:

　　Introduction to craftsmanship: Here I will briefly introduce the role of craftsmanship to give you a perceptual understanding.

　　1. Battery test: Due to the randomness of the production conditions of the battery cells, the performance of the produced batteries is different. Therefore, in order to effectively combine batteries with consistent or similar performance, they should be classified according to their performance parameters; battery testing is Classify batteries by testing the magnitude of their output parameters (current and voltage). In order to improve the utilization rate of batteries and make battery components with qualified quality.

　　2. Frontal welding: The bus strip is welded to the main grid line on the front side of the battery (negative electrode). The bus strip is a tinned copper strip. The welding machine we use can spot weld the solder strip to the main grid in a multi-point manner. on-line. The heat source used for welding is an infrared lamp (using the thermal effect of infrared rays). The length of the welding ribbon is approximately twice the side length of the battery. The extra soldering ribbon is connected to the back electrode of the subsequent battery piece during back welding.

　　3. Backside series connection: Backside welding is to connect 36 cells in series to form a component string. The process we currently use is manual. The positioning of the battery mainly relies on a membrane plate with 36 recesses for placing the battery cells. The size of the slot corresponds to the size of the battery. The position of the slot has been designed. Different templates are used for components of different specifications. The operator uses a soldering iron and solder wire to weld the front electrode (negative electrode) of the front battery to the rear battery. On the back electrode (positive electrode), connect 36 pieces together in series and weld leads to the positive and negative electrodes of the component string.

　　4. Laminated laying: After the back side is connected in series and passed the inspection, the component strings, glass, cut EVA, fiberglass, and backboard are laid according to certain levels and prepared for lamination. The glass is previously coated with a layer of primer to increase the bonding strength between glass and EVA. When laying, ensure the relative position of the battery string and glass and other materials, and adjust the distance between batteries to lay a solid foundation for lamination. (Laying level: from bottom to top: glass, EVA, battery, EVA, fiberglass, backplane).

　　5. Component lamination: Put the laid battery into the laminator, vacuum out the air in the component, then heat to melt the EVA and bond the battery, glass and backplate together; finally cool and remove the component. The lamination process is a key step in component production. The lamination temperature and lamination time are determined by the properties of EVA. When we use fast-cure EVA, the lamination cycle time is about 25 minutes. The curing temperature is 150°C.

　　6. Trimming: During lamination, the EVA melts and solidifies outward due to pressure to form burrs, so it should be removed after lamination.

　　7. Framing: Similar to installing a frame on glass; installing aluminum frames on glass components increases the strength of the components, further seals the battery components, and extends the service life of the battery. The gaps between the frame and the glass components are filled with silicone resin. Each frame is connected with angle keys.

　　8. Welding junction box: Weld a box at the lead on the back of the component 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 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 testing: The purpose of testing is to calibrate the output power of the battery, test its output characteristics, and determine the quality level of the component.

　　Solar array design steps:

　　1. Calculate the capacity P consumed by the load in 24 hours.

　　P=H/V

　　V——Load rated power supply

　　2. Select the daily sunshine hours T (H).

　　3. Calculate the solar array operating current.

　　IP=P(1+Q)/T

　　Q——According to the surplus coefficient during the rainy period, Q=0.21～1.00

　　4. Determine the battery float voltage VF.

　　The single float charge voltages of cadmium-nickel (GN) and lead-acid (CS) batteries are 1.4~1.6V and 2.2V respectively.

　　5. Solar cell temperature compensation voltage VT.

　　VT=2.1/430(T-25)VF

　　6. Calculate the solar array operating voltage VP.

　　VP=VF+VD+VT

　　Among them VD=0.5～0.7

　　Approximately equal to VF

　　7. Solar cell array output power WP? Flat-panel solar panel.

　　WP=IP×UP

　　8. According to the VP and WP silicon battery flat panel combination series tables, determine the number of series blocks and the number of parallel groups in standard specifications.

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