WELDING JIG

Disclosed is a welding jig for welding an electrode lead of a battery cell and a sensing bus bar of a bus bar assembly to each other, and the welding jig includes a jig body disposed above the electrode lead and the sensing bus bar during the welding; and a positioning guide unit provided to the jig body and configured to make a step correction in at least three directions when the electrode lead and the sensing bus bar are welded.