T-JOINT WELDING METHOD FOR POLE ROD AND TAP OF SECONDARY BATTERY

摘要

PURPOSE: A T-shaped welding method of a pole rod tab for a secondary battery is provided to obtain a welding side with uniform welding parts and low heat influence and to reduce welding area and welding defects by using a laser welding method. CONSTITUTION: A T-shaped welding method of a pole rod tab for a secondary battery includes a step of arranging a plurality of electrode plates (10) in a multilayer structure and disposing a pole rod (20) on a tab installed on the electrode plates; and a step of laser beam (L)-irradiating the pole rod from the upper part of the pole rod and welding the tab and the pole rod by residual heat after penetrating the pole rod. The laser beam has a size of 600-800 micron, 1800 W output, and a movement speed of 1.7-2.1 m/min and conducts a welding.