A pouch-type secondary battery comprising: an electrode assembly equipped with an electrode tab; an electrode lead connected to the electrode tab; a pouch housing accommodating and sealing the electrode assembly such that the electrode lead is exposed partly; and a first sealant interposed between the top surface of the electrode lead and the inner surface of the pouch housing and a second sealant interposed between the lower surface of the electrode lead and the inner surface of the pouch housing, wherein the electrode lead comprises a joint portion joined to the electrode tab, a terminal portion exposed to the outside of the pouch housing and a fuse portion between the joint portion and the terminal portion, the fuse portion comprises a separating groove comprising a horizontal slit at the center thereof which is in parallel to the width direction of the electrode lead and a breaking portion connected to the separating groove for separating the terminal portion from the joint portion, and the shapes of the first sealant and the second sealant are different from each other such that, when the pressure inside the secondary battery is increased, the stress applied to the pouch housing is in opposite directions at the top surface and the lower surface of the electrode lead so that the breaking portion breaks; wherein the pouch housing is equipped with a sealing zone at its edge, the horizontal slit is separated from the sealing zone toward the joint portion and the breaking portion is formed inside the sealing zone; wherein the joint portion has a larger width than the terminal portion; wherein the horizontal slit has a length which is the same as the width of the terminal portion; and wherein the separating groove further comprises a vertical slit at both ends of the horizontal slit, which is perpendicular to the width direction of the electrode lead and faces the terminal portion, and the breaking portion is positioned along a line extending from the vertical slit to face the terminal portion; characterized in that the first sealant is formed in the form of a band crossing the top surface of the electrode lead to be adhered to the pouch housing and has a portion protruding toward the horizontal slit so as to cover the top surface of the electrode lead above the horizontal slit, and the second sealant is formed in the form of a band crossing the lower surface of the electrode lead to be adhered to the pouch housing and has protruding portions such that it can be formed on the lower surface of the electrode lead outside the vertical slit. an electrode assembly equipped with an electrode tab; an electrode lead connected to the electrode tab; a pouch housing accommodating and sealing the electrode assembly such that the electrode lead is exposed partly; and a first sealant interposed between the top surface of the electrode lead and the inner surface of the pouch housing and a second sealant interposed between the lower surface of the electrode lead and the inner surface of the pouch housing, wherein the electrode lead comprises a joint portion joined to the electrode tab, a terminal portion exposed to the outside of the pouch housing and a fuse portion between the joint portion and the terminal portion, the fuse portion comprises a separating groove comprising a horizontal slit at the center thereof which is in parallel to the width direction of the electrode lead and a breaking portion connected to the separating groove for separating the terminal portion from the joint portion, and the shapes of the first sealant and the second sealant are different from each other such that, when the pressure inside the secondary battery is increased, the stress applied to the pouch housing is in opposite directions at the top surface and the lower surface of the electrode lead so that the breaking portion breaks; wherein the pouch housing is equipped with a sealing zone at its edge, the horizontal slit is separated from the sealing zone toward the joint portion and the breaking portion is formed inside the sealing zone; wherein the joint portion has a larger width than the terminal portion; wherein the horizontal slit has a length which is the same as the width of the terminal portion; and wherein the separating groove further comprises a vertical slit at both ends of the horizontal slit, which is perpendicular to the width direction of the electrode lead and faces the terminal portion, and the breaking portion is positioned along a line extending from the vertical slit to face the terminal portion; characterized in that the first sealant is formed in the form of a band crossing the top surface of the electrode lead to be adhered to the pouch housing and has a portion protruding toward the horizontal slit so as to cover the top surface of the electrode lead above the horizontal slit, and the second sealant is formed in the form of a band crossing the lower surface of the electrode lead to be adhered to the pouch housing and has protruding portions such that it can be formed on the lower surface of the electrode lead outside the vertical slit.