Patent ID: 9735413
Date: 2017-08-15
CPC Classifications: B23K,H01M,Y02E

Claim:
1. A battery pack tab welding method for welding a positive electrode tab and a negative electrode tab in a battery pack, the battery pack comprising a plurality of single cells stacked, each of which has positive and negative electrode tabs drawn outward and formed of metals different from each other in kind, the positive and negative electrode tabs being welded through a clad material comprising layers formed of the different kind of metals, respectively, the method comprising the steps of: aligning a positive electrode tab of a first single cell, a negative electrode tab of a second single cell adjacent to the first single cell, and a clad material so that the same kind of metals are in contact with each other; and applying a laser from one of directions crossing the principal surfaces of the positive electrode tab and the negative electrode tab and the clad material thereby bonding one of the tabs to the clad material, while applying another laser from the other direction thereby bonding the other of the tabs to the clad material.