A pouch-type secondary battery, comprising: an electrode assembly; and a pouch sheath material configured to receive the electrode assembly and comprising a first pouch portion and a second pouch portion, wherein the first pouch portion and the second pouch portion are adhered to each other by each sealing portion, the pouch-type secondary battery further comprising: a first electrode lead extended from the electrode assembly and attached to the first pouch portion; a second electrode lead attached to the second pouch portion and protruding out of the exterior of the pouch sheath material; a first sealing member interposed between the first electrode lead and the second electrode lead to prevent the first electrode lead and the second electrode lead from being in contact with each other; and a film-like connection member configured to connect the first electrode lead electrically with the second electrode lead, one terminal end of the film-like connection member is attached to the first electrode lead and the other terminal end thereof is attached to the second electrode lead, wherein the film-like connection member is made of a conductive flexible metallic or non-metallic material so that a curved surface is formed, and characterized in that when the internal pressure of the pouch sheath material exceeds a critical value, a predetermined portion of the film-like connection member is broken by the pressure. an electrode assembly; and a pouch sheath material configured to receive the electrode assembly and comprising a first pouch portion and a second pouch portion, wherein the first pouch portion and the second pouch portion are adhered to each other by each sealing portion, the pouch-type secondary battery further comprising: a first electrode lead extended from the electrode assembly and attached to the first pouch portion; a second electrode lead attached to the second pouch portion and protruding out of the exterior of the pouch sheath material; a first sealing member interposed between the first electrode lead and the second electrode lead to prevent the first electrode lead and the second electrode lead from being in contact with each other; and a film-like connection member configured to connect the first electrode lead electrically with the second electrode lead, one terminal end of the film-like connection member is attached to the first electrode lead and the other terminal end thereof is attached to the second electrode lead, wherein the film-like connection member is made of a conductive flexible metallic or non-metallic material so that a curved surface is formed, and characterized in that when the internal pressure of the pouch sheath material exceeds a critical value, a predetermined portion of the film-like connection member is broken by the pressure. a first electrode lead extended from the electrode assembly and attached to the first pouch portion; a second electrode lead attached to the second pouch portion and protruding out of the exterior of the pouch sheath material; a first sealing member interposed between the first electrode lead and the second electrode lead to prevent the first electrode lead and the second electrode lead from being in contact with each other; and a film-like connection member configured to connect the first electrode lead electrically with the second electrode lead, one terminal end of the film-like connection member is attached to the first electrode lead and the other terminal end thereof is attached to the second electrode lead, wherein the film-like connection member is made of a conductive flexible metallic or non-metallic material so that a curved surface is formed, and characterized in that when the internal pressure of the pouch sheath material exceeds a critical value, a predetermined portion of the film-like connection member is broken by the pressure.