Patent ID: 8790822

Claim:
A rechargeable battery comprising: an electrode assembly; a case having an opening and in which the electrode assembly is installed; a cap plate combined to the opening and sealing the case; at least one electrode terminal electrically connected with the electrode assembly; a lower gasket between the cap plate and the electrode terminal, the lower gasket having an end portion at a lower portion of the cap plate and including a first inclined side forming an acute angle or an obtuse angle with respect to a side of the cap plate; and a lower insulating member provided in the case, the lower insulating member having an end portion adjacent to the end portion of the lower gasket in a lower portion of the cap plate and including a second inclined side forming an acute angle or an obtuse angle with respect to the side of the cap plate, wherein the cap plate includes a stepped groove at a lower portion thereof and at least one of the end portion of the lower gasket and the end portion of the lower insulating member extends into the stepped groove, and wherein: the lower gasket includes a first protruding portion protruding from the end portion of the lower gasket, the lower insulating member includes a second protruding portion protruding from the end portion of the lower insulating member, and the first and second protruding portions extend into the stepped groove.