Patent ID: 7858217

Claim:
A top sealing plate used for a battery, comprising: a filter, a cap, and a valve body, wherein said filter includes a valve hole and upper opening; said cap has a convex portion, and a flange portion disposed around said convex portion; an opening end of said upper opening of said filter has a bend portion; an outer periphery end of said flange portion of said cap and said bend portion include a caulked portion that is caulked and jointed to each other; said caulked portion is formed by caulking while said outer periphery end of said flange is positioned in said bend portion; said valve body is disposed to cover said valve hole, in a space formed between said cap and said filter; said caulked portion includes a first contact portion and a second contact portion between the surface of the outer periphery end of said flange and said bend portion, a contact pressure of said first contact portion is stronger than a contact pressure of said second contact portion; said outer periphery end of said flange portion includes a projection extending from at least one out of the surface and the back thereof; said first contact portion is formed from a contact of said projection and said bend portion; and said cap and said filter are electrically connected to each other by the contact with said outer periphery end and said bend portion at said caulked portion.