An electrode assembly includes: an active material coating portion, and a tab portion including a plurality of tab sheets which are arranged in a laminated manner; the plurality of tab sheets are laminated to form an overlapping area and an offset area; th...

A secondary battery, including an electrode assembly including an electrode tab protruding to one side, a case accommodating the electrode assembly and having an open side and an electrode terminal, a case cover sealing the open side of the case, and an an...