Welding precautions for 18650 lithium-ion batteries.
1、 Operation diagram of bottom welding process for 18650 lithium-ion battery
Attention to issues:
1. Welding strength: ≥ 15, battery internal resistance increases, battery performance decreases, and usage time is short
2. Spot welding appearance: There is no explosion, virtual welding, or detachment phenomenon in the extreme ear, and there is no welding penetration, convex or concave points, deformation, explosion or other adverse phenomena at the bottom of the shell; Poor appearance and easy rusting; Welding through will cause leakage and the battery will be scrapped.
3. Parameters for spot welding: welding current, preloading time, pressure; Poor spot welding
4. Center hole damage: short circuit of battery cell
5. Leakage of insulation film: unable to ensure complete isolation between positive and negative electrodes, thus posing a safety hazard
6. Short circuit test: DC150V, 500uA leakage detection; There may be safety hazards such as heat and explosion;
2、 18650 Lithium ion Battery Laser Welding Process Operation Diagram
matters needing attention:
1. Welding strength: ≥ 15N virtual welding, welding penetration, high internal resistance
2. Welding appearance: There is no virtual welding, explosion, welding penetration, or over welding phenomenon at the welding points, and the upper and lower edges of the pole ears are left blank without exceeding the edge of the aluminum bottom plate of the cover plate; Cap detachment, zero voltage; High internal resistance, short circuit, battery overheating;
