18650 lithium battery production process

Bake for 12 hours under the condition of constant temperature and vacuum degree of -0.09MPa, the main purpose is to dry the moisture of the battery. (2) Liquid injection: Inject electrolyte into the vacuum-baked battery cell in a glove box filled with Ar gas. The amount of liquid injection varies according to the battery design. The battery must be weighed before and after liquid injection. The difference in weight is liquid injection. In order to judge whether the injection volume is appropriate or not. (3) Welding electrode lugs Weld the positive electrode lug (aluminum strip) and the negative electrode lug (nickel strip) on the scraper positions of the positive and negative electrode pieces with an ultrasonic welding machine. Be wary of welding deviation, welding misalignment, 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 weld the negative lug to the bottom of the steel shell with a spot welder. Inspect the outer surface of the bottom of the steel shell, pick out the poor appearance such as yellow spots, black spots, defects, and explosions, and try to pull the tabs, and pick out the batteries 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 battery, and then use the laser welder to continue laser welding. Laser welding should ensure accurate positioning and clean welded parts. It is strictly forbidden to cause battery deformation or damage. Check after welding and repair defective batteries with welding holes, explosions, etc. (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 tape is single-sided. 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 must not be rolled off, and the front end of the pole piece must be inserted to the top. Check the winding defects: the ion exchange membrane is uneven, that is, the positive and negative electrodes exceed the exchange membrane; the high and low pieces of the pole piece are not put in place, the positive end of the outer ring does not hold the end of the negative electrode, and the positive and negative plates of the inner ring are in contact with each other. The top of the exchange membrane is not overlapped, and there is still a distance; the exchange membrane is too tight to hold the negative end; the positive aluminum belt and the negative nickel belt are too long and short; the battery core end is not properly wrapped; the battery core is not rolled in place: the distance between the positive and negative ears Wide or narrow; the exchange membrane is not flattened and wrinkled; the positive electrode is crimped; the positive electrode has no corners or missing corners; the exchange membrane does not fully embrace the tail of the negative electrode; the inner and outer pole pieces are misaligned. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages of large-capacity single-cell lithium batteries?