A pouch type secondary battery comprising: an electrode assembly in which one or more positive electrode plates and negative electrode plates are stacked; an electrode tab that extends from the electrode assembly; an electrode lead bondingly connected to the electrode tab; and a pouch exterior that surrounds and seals the electrode assembly such that a portion of the electrode lead is exposed, wherein the electrode lead is provided with a first weld area electrically coupled to the electrode tab, and the electrode tab comprises: a second weld area electrically coupled to the first weld area; an electrode connection part distinguished from the second weld area by a rupture portion connecting area, and electrically connected to the electrode assembly; and the rupture portion connecting area which connects the second weld area and the electrode connection part, and which is ruptured when stress occurs and separates the second weld area from the electrode connection part; wherein the rupture portion connecting area comprises rupture lines each of which has a linear shaped groove that is provided on a surface of the electrode tab in a longitudinal direction and is bent and ruptured in a direction perpendicular to the surface when stress occurs, and a rupture groove is provided at each of both ends of the rupture line in a direction parallel to the surface of the electrode tab. tabtab an electrode assembly in which one or more positive electrode plates and negative electrode plates are stacked; an electrode tab that extends from the electrode assembly; an electrode lead bondingly connected to the electrode tab; and a pouch exterior that surrounds and seals the electrode assembly such that a portion of the electrode lead is exposed, wherein the electrode lead is provided with a first weld area electrically coupled to the electrode tab, and the electrode tab comprises: a second weld area electrically coupled to the first weld area; an electrode connection part distinguished from the second weld area by a rupture portion connecting area, and electrically connected to the electrode assembly; and the rupture portion connecting area which connects the second weld area and the electrode connection part, and which is ruptured when stress occurs and separates the second weld area from the electrode connection part; wherein the rupture portion connecting area comprises rupture lines each of which has a linear shaped groove that is provided on a surface of the electrode tab in a longitudinal direction and is bent and ruptured in a direction perpendicular to the surface when stress occurs, and a rupture groove is provided at each of both ends of the rupture line in a direction parallel to the surface of the electrode tab. tabtab a second weld area electrically coupled to the first weld area; an electrode connection part distinguished from the second weld area by a rupture portion connecting area, and electrically connected to the electrode assembly; and the rupture portion connecting area which connects the second weld area and the electrode connection part, and which is ruptured when stress occurs and separates the second weld area from the electrode connection part; wherein the rupture portion connecting area comprises rupture lines each of which has a linear shaped groove that is provided on a surface of the electrode tab in a longitudinal direction and is bent and ruptured in a direction perpendicular to the surface when stress occurs, and a rupture groove is provided at each of both ends of the rupture line in a direction parallel to the surface of the electrode tab. tabtab