Patent ID: 8936869
Filing Date: 2015-01-20
Classification: H01M,Y02E,Y10T

Abstract:
1. A sealed cell comprising a generating unit, a cell container within which the generating unit is housed, and a sealing lid that seals the cell container, wherein: the sealing lid comprises a cap having an external positive terminal, and a cap case that is integrated with the cap; the cap case comprises a flange that is crimped back to a cap upper surface at an external periphery of the cap, and a protrusion for welding that projects from an inner circumferential edge of the flange toward a center of the cap; and the cap and the cap case are welded together at the protrusion for welding; wherein the protrusion for welding comprises a connecting portion that is connected to the flange, and an end portion that is widened out from the connecting portion towards the center of the cap; and wherein a length of the connecting portion in a circumferential direction of the cap case is made to be shorter than a length of the end portion in the circumferential direction.