What is the process of making 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 amount of liquid injection is used to judge whether the amount of liquid injection 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 cell into the steel shell, and use a spot welder to weld the negative lug to the bottom of the steel shell. Check the outer surface of the bottom of the steel shell, pick out the yellowish spots, black spots, defects, fire and other appearance defects, and try to pull the tabs, pick out the 18650 lithium battery packs with weak spot welding such as fire, 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 battery deformation or damage. Check after welding, repair welding for defective batteries such as welding holes and fire. (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 cannot be dropped, the tape is slanted, and the single-sided tape Defects such as too long, misalignment of the double-sided tape, and the tape not covering the solder joints, the positive electrode material must hug the negative electrode material, the pole piece cannot be rolled off, 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 is the fundamental function of the battery?