To reliably prevent sealing failure between a sealing plug and an electrolyte pouring hole and enhance airtightness between the sealing plug and the electrolyte pouring hole.
A sealed battery includes an outer can having an opening; an electrode body housed in the outer can; a sealing plate sealing the opening of the outer can and having the electrolyte pouring hole for pouring an electrolyte in the outer can; and the sealing plug having a flat plate-like presser part and a resin protrusion formed on the surface of the plate-like presser part, for sealing the electrolyte pouring hole, and the protrusion of the sealing plug is inserted into the electrolyte pouring hole, the outer periphery of the flat plate-like presser part and the sealing plate are welded to seal the outer can, and the electrolyte pouring hole of the sealing plate has a spot-like return protrusion in the vicinity of the periphery on the electrode side.
SHIGEMITSU KATSUHIKO
FUJII SHIGEKI
Next Patent: METHOD OF MANUFACTURING CONDUCTIVE MATERIAL