Patent ID: 8808406

Claim:
A method of manufacturing a secondary battery, comprising: providing 1) an electrode assembly comprising an outer surface, 2) a sealing tape attached to and surrounding at least part of the outer surface of the electrode assembly, wherein the sealing tape comprises i) an adhesive layer contacting the outer surface of the electrode assembly and ii) a base layer formed on the adhesive layer, wherein the base layer is formed of a material which has directionality and wherein the base layer comprises first and second regions, and 3) a can configured to receive the electrode assembly and sealing tape; placing the electrode assembly and the sealing tape into the can so as to form an assembled secondary battery; and subjecting the base layer to contact electrolyte, wherein the base layer at least partially loses directionality and partially shrinks so that the first region is thicker than the second region and contacts an inner surface of the can.