NOVELTY - The battery has a battery case for accommodating a cell assembly (100) that is provided with multiple unit cells (110-1 - 110-5). A temperature sensor (140) is provided with a temperature detection unit (141). An electrode plate is arranged with an uncoated area path (P). The temperature sensor is positioned at the uncoated area path. A sensor lead (142) is extended from the temperature detection unit. A detachable film (112) is interposed between an anode plate (111) and a cathode plate (113) that is provided with a cathode tab. The electrode plate is provided with an electrode lead (131).    USE - Pouch-type secondary battery e.g. lithium secondary battery, nickel-cadmium battery, nickel-hydrogen battery and nickel zinc battery, for use in a secondary battery module of a battery pack of a battery powered system such as mobile apparatus, uninterruptible power supply system and power storage system, and a vehicle e.g. electric vehicle and hybrid vehicle (all claimed).    ADVANTAGE - The temperature detection unit accurately and quickly senses temperature change of the battery due to overheat and internal short-circuit of the battery so as to avoid deformation of the battery and fire accident occurrence, thus ensuring safety of an operator and facilitating temperature control about the battery without additional loss of a maintenance unit area of the battery. The gas generated in an inner side of the battery case can be effectively and easily ejected to a peripheral area of the cell assembly so as to prevent degradation of operating efficiency of the battery due to lifting of the electrode plate.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a battery powered system.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a pouch-type secondary battery.    Uncoated area path (P)    Cell assembly (100)    Unit cells (110-1 - 110-5)    Anode plate (111)    Detachable film (112)    Cathode plate (113)    Electrode lead (131)    Temperature sensor (140)    Temperature detection unit (141)    Sensor lead (142)