Disclosed herein is a battery cell including: an electrode assembly including an electrode tab protruding toward at least one outer periphery; a battery case including an accommodation part in which the electrode assembly is mounted; and an electrode lead connected to the electrode tab for electrical connection with an external device, wherein the electrode lead includes: a tab connection part electrically connected to the electrode tab; and a protrusion extension part extended from the tab connection part and protruding outwardly of the battery case to thereby be electrically connected to the external device, the tab connection part being coated with a gas adsorbent.