Method of laser-welding and method of manufacturing battery including the same

Abstract

Provided is a method of laser-welding that can achieve uniform welding of a member with large laser reflectance on a surface thereof A laser welding step (S1) includes a surface roughening step (S11) in which a first laser processing device irradiates laser light to a surface (each welding portion (31)) of a welding section (30, 30, 30, 30) between a negative electrode terminal (20) (a first member) and a negative electrode lead (21) (a second member) and carries out roughening, thereby forming a laser marker (32) on the surface; and a welding step (S12) in which a second laser processing device irradiates laser light to each welding portion (31) roughened in the surface roughening step (S11) and melts each welding portion (31), thereby carrying out the laser-welding of the negative electrode terminal (20) to the negative electrode lead (21).

Dependencies are inferred from the claim text.