Battery pack connecting piece welding device

The invention relates to the technical field of welding, in particular to a battery pack connecting piece welding device which comprises a rack, a welding assembly is arranged on the rack and comprises a welding head and a moving frame, the moving frame is connected with the welding head and drives the welding head to move horizontally on the rack, and a jacking welding needle is arranged on the welding head and connected with the moving frame. A plurality of spot welding needles are arranged on the periphery of the jacking welding needle in a circumferential array mode, when the welding head descends, the jacking welding needle firstly jacks and positions the battery pack connecting pieces, the battery pack connecting pieces are prevented from moving, welding of the spot welding needles is facilitated, meanwhile, the spot welding needles are arranged on the periphery of the jacking welding needle in a circumferential array mode, and the spot welding needles conduct spot welding on the battery pack connecting