The method of manufacturing a battery and a battery

The present invention relates to a method of manufacturing the battery, the battery is a multilayer foil, the aluminum foil is exposed to the overlapping portion of the exposed portion laminated foil and the positive electrode terminal member made of aluminum bonded via a plurality of nuggets, the manufacturing method of the battery the steps of: forming, a foil welded portion is formed in the overlapping portion of the multilayer foil, the foil is welded portion welded by ultrasonic welding to one another from an aluminum foil, forming at least a portion of a planned joint surface of the upper portion has a first and a the first upper portion has a plurality of first low portion scattered punctate distribution; and a resistance welding step, the first upper portion abuts on the positive terminal member, a current flows, nugget in the first low portion, via the nugget the foil is welded to the positive electrode terminal member portion resistance-welded.