METHOD OF MANUFACTURING SECONDARY BATTERY

A method of manufacturing a secondary battery according to the disclosure includes an attaching step of attaching a sealing plate to an open end of a case main body including a closed bottom, and a welding step of laser-welding the case main body and the sealing plate together by scanning a laser beam along a peripheral edge portion of the sealing plate. In the welding step, the laser beam applied to the peripheral edge portion of the sealing plate and to an edge of the open end of the case main body may be a pulsed laser beam including a rectangular wave and having a pulse width of from 400 µm to 800 µm and a frequency of from 1.2 kHz to 1.4 kHz, and the laser beam is scanned such that adjacent laser pulses of the pulsed laser beam have an overlap rate of 84.4% to 86.6%.