The product is suitable for welding in 18650 26650 21700 32650 electric vehicle battery pack, electric bicycle battery pack, automobile battery module, street lamp battery pack, balance car battery pack, scooter battery pack, mobile power supply, starting battery pack module, electric tool battery pack, energy storage power supply battery pack and other fields. Automatic compensation of welding pin, water cooling and heat dissipation of welding head, very beautiful welding effect, elimination of false welding, self current welding detection, high-end quality, durable, one-year warranty, lifelong maintenance!