18650 battery lithium ion 2200mah

　　18650 lithium battery production process II: assembly

　　The sorted positive and negative electrodes will be fully automatic wrapped here, and the white material is the diaphragm. The 18650 lithium battery can't work normally. It needs to add electrolyte as a medium to allow the positive and negative electrodes to undergo a chemical reaction, so that lithium ions can migrate between the positive and negative electrodes, and the lithium battery can be charged and discharged by generating charged ions and outputting energy. After the automatic roll is wrapped, it rolls directly on the assembly line, and enters the next assembly step to be loaded into the steel shell.

　　The steel shell is stamped and formed in one piece, with a thickness of less than 1mm. Therefore, the requirements for the strength and quality of the steel are very high. This 18650 lithium battery factory uses imported Korean steel materials.

　　This step connects the negative electrode lug to the bottom of the steel case by spot welding. Ensure spot welding accuracy and product quality. The spot welder can't weld the bottom of the steel shell. There is a copper nail in the hand of the assembling girl. First insert it into the bottom from the reserved hole, then put it into the spot welder, click once, and the negative electrode will be connected with the nickel strip to the bottom of the steel shell. alright.

　　The electrolyte is injected into a glove box filled with inert gas argon in a sealed box. The oxygen concentration in the sealed box glove must be lower than 10ppm to prevent electrode oxidation. The argon gas of the electrolyte is input into the sealed box through the circulation purification device, and there are catalyst and reducing agent hydrogen in the device, and the oxygen can be removed by generating water through the reaction of hydrogen and oxygen. At the same time, the desiccant in the device absorbs moisture to ensure the dryness of the atmosphere in the box.

　　After the electrolyte has been injected into the cell, the cap and the steel case have been joined together by laser welding. Stacked neatly and orderly in rows, ready to go. A new 18650 lithium battery was born in this way. Each cell needs to be put on a "new clothes" PVC sleeve classified by capacity. Different capacities correspond to different PVC envelopes.

　　18650 lithium battery production process three: first charge and test

　　After the electrolyte is injected into the 18650 lithium battery, it has not actually been charged, and the state of the surface of the positive and negative electrodes has not reached a stable state at this time. It must be charged for the first time before it can be used normally. This first charge is called "formation". . When charging for the first time, additional electricity needs to be charged to form a protective film on the electrode surface. This protective film is the secret of the low self-discharge of lithium-ion batteries. At the same time, the properties of the protective film also affect the performance and life of the battery. Therefore, the chemical formation process is very important. Formation is done using subcontainers.

　　Batteries are chemicals. In order to ensure the safety and longevity of use, they need to be paired and packed in boxes before leaving the factory, with 200 pieces in each box. Ensure three consistency: consistent capacity, consistent internal resistance, consistent voltage. Only in this way can it leave the factory normally, otherwise it will be relegated to the limbo and reduced to B-level and C-level batteries.