METHOD FOR PRODUCING A SEALED BATTERY

A method for producing a sealed battery, capable of firmly joining a battery case and a sealing cover, includes injecting an electrolytic solution into the battery case through the liquid inlet, and after the injecting, welding the battery case and the sealing cover by irradiating and linearly scanning a laser beam on a welding area across the battery case and the sealing cover, while the liquid inlet is closed with the sealing cover. The laser beam has a beam profile including a first beam capable of vaporizing the electrolytic solution and oil, which exist on the surface of the welding area, and a second beam enabling keyhole welding on a removal portion of the welding area, from which at least part of the electrolytic solution and at least part of the oil have been removed by irradiation of the first beam.