Patent ID: 6579640
Filing Date: 2003-06-17
Classification: H01M,Y02E,Y02P

Abstract:
A sealed rectangular battery having an electrically conductive battery case made up of (1) an external casing that has an opening and (2) a sealing cap that is attached using heat to the external casing to seal the opening, the sealed rectangular battery comprising:an electrode terminal having a shaft member that (1) protrudes through a first hole formed in the battery case and (2) is insulated from the battery case with an insulating gasket; and a safety valve composed of (i) a valving element that covers a second hole which is connected to an inside of the sealed rectangular battery, and (ii) a cap that houses the valving element and becomes charged with a same polarity as the battery case, wherein the electrode terminal and the safety valve are provided separately at different positions on the battery case, the first hole has a cylindrical projection formed in the battery case to project in a direction outward from the battery case, and an exposed part of the gasket is positioned at an outward top edge of the projection.