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 (F1) electrically coupled to the electrode tab , and the electrode tab comprises: a second weld area (F2) electrically coupled to the first weld area (F1); an electrode connection part distinguished from the second weld area (F2) 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 (F2) and the electrode connection part , and which is ruptured when stress occurs and separates the second weld area (F2) 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 (F1) electrically coupled to the electrode tab , and the electrode tab comprises: a second weld area (F2) electrically coupled to the first weld area (F1); an electrode connection part distinguished from the second weld area (F2) 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 (F2) and the electrode connection part , and which is ruptured when stress occurs and separates the second weld area (F2) 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 (F2) electrically coupled to the first weld area (F1); an electrode connection part distinguished from the second weld area (F2) 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 (F2) and the electrode connection part , and which is ruptured when stress occurs and separates the second weld area (F2) 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 <EOS>