Patent ID: 8298705
Filing Date: 2012-10-30
Classification: H01M,Y02E

Abstract:
1. A sealed battery comprising: an outer can having a mouth portion; a sealing plate for sealing the mouth portion of the outer can; an electrolyte pour hole passing through the sealing plate; a rivet having a shank part inserted in the electrolyte pour hole and a flange part covering a peripheral surface of the electrolyte pour hole; and a gasket interposed between the peripheral surface of the electrolyte pour hole and a back side of the flange part of the rivet; wherein on the peripheral surface of the electrolyte pour hole, an inner annular first convex part and an outer annular second convex part being formed, on the back side of the flange part of the rivet, an annular third convex part being formed, and a central vertical axis of the third convex part being placed between a central vertical axis of a groove between the first convex part and the second convex part and the central vertical axis of the second convex part.