SEALED BATTERY

PROBLEM TO BE SOLVED: To provide a technology for improving productivity in a sealing process by avoiding a sealing failure occurring at the time of sealing an intake port provided on a battery sealing body, and to secure long-term reliability in preventing liquid leakage after fitting.SOLUTION: A sealing plug 21 comprises a lid body 22 of a flat shape and a plug body 23. The plug body 23 is formed of an elastic material in a hollow state. The lid body 22 is positioned so as to cover the electrolyte solution intake port of the battery sealing body 10, and the plug body 23 is press-fitted into the intake port opened on the battery sealing body to be in a compressed state. The lid body 22 and the plug body 23 are separated until the lid body 22 is made in contact with the plug body 23 in such a state that it covers the intake port 20. Since the plug body 23 is formed of a hollow elastic material, the plug body 23 adheres tightly to an inner wall part of the intake port when press-fitting the sealing plug 21 into the intake port, and welding between the sealing plug 21 and the battery sealing body 10 is sufficiently carried out to surely seal. Therefore, the sealed battery with high reliability can be provided.