Sealed battery and method for manufacturing the same

Abstract

A sealed battery uses an outer can 15 with an opening and a sealing plate 16 provided with a rising part which rises perpendicularly from the middle of a flange on the entire circumference of or a part of the fitted face with the battery outer can 15 . A production method thereof includes inserting the sealing plate 16 into the opening of the battery outer can 15 so that the top faces of both the battery outer can 15 and the flange of the sealing plate 16 are substantially in the same plane, and irradiating the fitted part of the opening of the battery outer can 15 and the sealing plate 16 with a high energy beam for welding.

1 . A sealed battery comprising:
 a battery outer can; and   a sealing plate for sealing an opening of the battery outer can, a fitted face of the battery outer can and the sealing plate being joined by a high energy beam welding;   a cross section of a welded part of the battery outer can and the sealing plate being a mound shape that is raised from a bottom face of a melted and solidified part toward the outside of the battery outer can and having a top located on a fitted line of the battery outer can and the sealing plate; and   the melted and solidified part on the battery outer can side and the sealing plate side being formed on the same face and substantially parallel to a top face of the sealing plate at the bottom face thereof, and being formed to be led to a tapered part on a top face side of a flange of the sealing plate.   
     
     
         2 . The sealed battery according to  claim 1 , wherein the battery outer can and the sealing plate are made of aluminum or an aluminum alloy.