Patent ID: 6596434
Filing Date: 2003-07-22
Classification: H01M,Y02E

Abstract:
A cylindrical alkaline storage battery comprising:a spiral-shaped group of electrodes, said group of electrodes including a positive electrode plate, a negative electrode plate and a plurality of separators; a metallic case containing said group of electrodes; a sealing plate for sealing a top part of said metallic case, having a safety valve provided therein, said sealing plate comprising: a cap-shaped terminal plate which includes a cap part and a flange; a disc-shaped filter under and in contact with said flange with a gas venting hole near the center thereof; and at least one gas exhaust hole on a surface of said cap-shaped terminal plate, a gap being formed between said filter and said flange from an internal pressure in said battery; said safety valve being positioned between said cap part and said filter; a space between said metallic case and both a rim of said flange and a rim of said filter, said space being sealed with a gasket; wherein an edge of said metallic case is bent inward to apply pressure to said gasket.