Battery welding device used for production of lithium ion batteries

The invention discloses a battery welding device used for production of lithium ion batteries, and particularly relates to the technical field of production of lithium ion batteries. The battery welding device used for production of the lithium ion batteries comprises a chassis, wherein a telescopic assembly is installed on the rear wall of the chassis, and a positioning assembly is installed on the upper surface of the chassis. According to the battery welding device used for production of the lithium ion batteries, by arranging the positioning assembly, different types of aluminium alloy cylinders can be clamped and loosened by encirclement rings formed by the inner walls of clamping strips, position stability of the lithium ion batteries during filling and welding is guaranteed, leakage and waste of a filling material are reduced, the efficiency of filling the lithium ion batteries is improved, the difficulty level of welding the lithium ion batteries is lowered, by arranging the telescopic assembly, a lim