Secondary battery

A secondary battery comprising:

• an electrode assembly including an anode plate having an inner circumferential tab formed at a wound front end thereof, a separator covering the anode plate, and a cathode plate having an outer circumferential tab formed at a wound distal end thereof;
• and
• a pouch case accommodating the electrode assembly therein and having the inner circumferential tab and the outer circumferential tab outwardly extending therefrom,
• wherein the anode plate includes an anode collector plate having an anode first surface and an anode second surface opposite to the anode first surface, an anode first active material layer coated on the anode first surface, and an anode second active material layer coated on the anode second surface, an anode first non-coating portion without the anode first active material layer coated thereon is formed at a wound front end of the anode first surface, the inner circumferential tab is welded to the anode first non-coating portion, an anode third non-coating portion without the anode second active material layer coated thereon is formed at a wound front end of the anode second surface, the cathode plate includes a cathode collector plate having a cathode first surface and a cathode second surface opposite to the cathode first surface, a cathode first active material layer coated on the cathode first surface, and a cathode second active material layer coated on the cathode second surface, a cathode second non-coating portion without the cathode first active material layer coated thereon is formed at a wound front end of the cathode first surface, and the anode first non-coating portion and the anode third non-coating portion at the wound front end of the anode plate are inserted between portions of the cathode second non-coating portion that face each other at the wound front end of the cathode first surface, the anode third non-coating portion extending along an entire length from the wound front end of the anode second surface to a first winding turn thereof.