NOVELTY - An electrode lead (120) comprises an inner lead (110) inserted between sealing portions of a case (30) and to which electrode tab (21,22) of electrode assembly (20) is attached, and which has a gas flow path for flowing gas between the inside and the outside of the case, and an external lead (120) disposed in the gas flow path. The external lead is separated from gas flow path such that electrical connection with the inner lead is cut off when pressure of the gas flowing into gas flow path is more than or equal to predetermined pressure.    USE - Electrode lead is used for secondary battery e.g. lithium secondary battery, nickel-cadmium battery, and nickel-metal hydride battery. Uses include but are not limited to cellular phone, notebook computer, camcorder, electric vehicle and hybrid vehicle.    ADVANTAGE - The electrode lead has excellent durability, and suppressed generation of internal pressure. The electrode provides secondary battery having excellent charging and discharging characteristics.    DETAILED DESCRIPTION - An electrode lead comprises an inner lead which is inserted between sealing portions of a case and to which an electrode tab of electrode assembly is attached, and which has a gas flow path such that it allows gas to flow between the inside and the outside of the case, and an external lead which is insertably disposed in the gas flow path. The external lead is electrically connected with the inner lead when inserted into the gas flow path, seals one end of the gas flow path. The external lead is separated from the gas flow path such that electrical connection with the inner lead is cut off when pressure of the gas flowing into the gas flow path is more than or equal to predetermined pressure. The electrode lead electrically connects electrode assembly provided inside the case of a secondary battery with the outside of the case. An INDEPENDENT CLAIM is included for secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of disassembled pouch-type secondary battery.    Electrode assembly (20)    Electrode tabs (21, 22)    Case (30)    Electrode lead (100)    Inner lead (110)    External lead (120)