CYLINDRICAL TYPE ALKALINE STORAGE BATTERY

摘要

With a cylindrical type alkaline storage battery comprising a spiral-shaped group of electrodes, which is formed of a belt-shaped positive electrode plate (6), negative electrode plate (7) and separator (8), a metallic case (5) containing the group of electrodes and a sealing plate (A1) hermetically sealing the top part of the metallic case, the sealing plate comprises a cap-shaped terminal plate (3), which is formed of a cap part (3a) and a flange (3b), and a disc-shaped filter (1) disposed on the underside of the flange of the cap-shaped terminal plate adjoining there and having a gas venting hole (1a) in the center thereof, and a space between the metallic case (5) and both rims of the flange (3b) of the cap-shaped terminal plate (12) and disc-shaped filter (1) constituting the sealing plate (B1), is filled with the gasket (4) and sealed entirely by having the edge of the metallic case (5) bent forcefully inward. Accordingly, a sealing plate of a simplified structure and a construction minimizing loss in the available internal volume are readily realized and also contact resistance between the flange and the filter is made variable reversibly.