Secondary battery

Abstract

The present invention relates to a chargeable / dischargeable secondary battery. The secondary battery, according to one embodiment of the present invention, may comprise: an electrode assembly; a sheet-type exterior material provided with an inner space for receiving the electrode assembly therein, and an exterior material opening enabling the inner space to communicate with the outside; a cap coupled to the sheet-type exterior material by being inserted into the exterior material opening; and a pressing member receiving heat and expanding, thereby pressing a coupling portion where the sheet-type exterior material and the cap are coupled.

Images