Laser processing method

Abstract

Provided is a laser processing method capable of ensuring both high welding strength and low current density while suppressing the area of a weld region at the time of welding a current collector foil and a tab lead of a battery. The laser processing method includes a step of laser welding a current collector foil 2 and a tab lead 3 at an end of a battery, wherein the laser welding is performed by radiating laser light selected from a blue laser and a green laser. When a direction in which the tab lead extends from the end of the battery is defined as a first direction, the laser welding is performed such that welds are arranged in a plurality of linear rows perpendicular to the first direction.

Dependencies are inferred from the claim text.