What is the production process of the 18650 lithium battery pack?

18650 lithium battery pack production process (1) Bake for 12 hours at a constant temperature and a vacuum of -0.09MPa. The important purpose is to dry the moisture of the battery. (2) Liquid injection: Inject the electrolyte into the vacuum-baked battery cell in a glove box filled with Ar gas. The amount of liquid injection varies according to the design of the lithium battery pack. The battery must be weighed before and after injection. The weight difference is The injection volume is used to judge whether the injection volume is appropriate or not. (3) Welding pole lugs Weld the positive electrode lug (aluminum strip) and the negative electrode lug (nickel strip) on the scraper positions of the positive and negative electrodes with an ultrasonic welding machine. Pay attention to prevent welding deviation, welding dislocation, and false welding. (4) Bottom welding. Put the insulating gasket into the steel shell first, then put the wound battery core into the steel shell, and weld the negative lug to the bottom of the steel shell with a spot welder. Check the outer surface of the bottom of the steel shell, pick out the yellowish spots, black spots, defects, explosions and other appearance defects, and try to pull the tabs, and pick out the 18650 lithium battery packs with weak spot welding such as explosions, false welding, and desoldering. (5) First, use a spot welder to spot weld the steel shell and cap of the 18650 lithium battery pack, and then use the laser welder to continue laser welding. Laser welding should ensure that the positioning is accurate and the welded parts are clean. It is strictly forbidden to cause the battery to deform or damage. Check after welding and repair the battery with welding holes, explosions and other defective batteries. (6) Winding Put the ion exchange membrane on the winding needle, and the front end extends 2-5mm from the winding needle. The four corners of the pole piece must not be wrinkled, the pole piece must not fall off, the tape is slanted, and the single-sided tape If it is too long, the double-sided tape is misaligned, or the tape does not cover the solder joints, the positive electrode material must hug the negative electrode material, the pole piece must not be rolled, and the front end of the pole piece must be inserted to the top. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the ways to maintain UPS battery capacity?