18650 lithium ion battery construction process and lithium ion battery assembly essentials

18650 Lithium-ion battery pack construction process (1) Bake for 12 hours at a constant temperature and a vacuum of -0.09MPa. The important goal is to dry the moisture of the battery cell. (2) Liquid injection: Inject the electrolyte into the vacuum-baked battery cell in a glove box full of Ar gas. The amount of liquid injection varies according to the design of the lithium-ion battery pack. The battery must be weighed before and after the injection. The difference is the injection volume, which is used to determine whether the injection volume is consistent or not. (3) Separating the 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 electrode plates 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 appearance of the bottom of the steel shell, pick out the yellowish spots, black spots, defects, explosions and other poor appearances, and try to pull the lugs, pick out the 18650 lithium-ion 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 ion battery pack, and then use a laser welder to continuously laser weld. 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 welding for defective batteries such as welding holes and explosions. (6) Winding: Place 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 it is single-sided. The tape is too long, the double-sided tape is misaligned, the tape does not block the solder joints and other defects. 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. 18650 lithium ion battery assembly essentials 1, 18650 lithium ion battery components are neatly arranged, which will facilitate future inspections. It is best to use a standard 18650 battery tray; 2. Excellent welding, the most common welding method on the market is to use a nickel welder for spot welding. You can also use an electric soldering iron, and the soldering points are brilliant; 3. After soldering, the lines of each battery group must be cleaned; 4. Waterproof and insulating, it is best to cut a piece of highland barley paper may use asbestos material; 5. The most important point , The internal resistance of the battery before welding, the current voltage error should not be higher than 0.05V! If possible, a special protective plate for the 18650 lithium ion battery pack must be added to prevent overshoot and overdischarge; 6. After welding, measure whether the voltage of each circuit is brilliant; statement: Some pictures and content of the articles published on this site are from the Internet, if any Infringement, please contact to delete the previous article: Introducing the achievements and reasoning of the power lithium-ion battery protection board