NOVELTY - The secondary battery has a battery can (1) and a battery cover (5) sealing the opening of battery can. The terminals (7A,7B) penetrate a through-hole in the battery cover. A gasket (4) is pinched by the battery cover and the terminal. The terminal has flange portions (71A,71B) and connection portions (72A,72B) having a diameter smaller than the diameter of the flange portions. The flange portion has annular shaped protrusions (73A,73B) formed in the state of protruding towards the side of connection portion from the flange plane and made to contact the gasket.    USE - Secondary battery for motor vehicle e.g. hybrid vehicle. Can also be used in electric vehicle.    ADVANTAGE - The airtightness of the terminal is maintained stably by making protrusions contact the gasket.    DETAILED DESCRIPTION - The secondary battery has a battery can (1) accommodating an electric power generation unit (2) consisting of positive and negative electrode plates arranged through a separator. A battery cover (5) seals the opening of battery can. The terminals (7A,7B) penetrate a through-hole formed in the battery cover. The current collecting plates (3A,3B) have one side connected to positive and negative electrode plates and other side connected to the terminal. A gasket (4) is pinched by the battery cover and the terminal. The terminal has flange portions (71A,71B) and connection portions (72A,72B) having a diameter smaller than the diameter of the flange portions. The flange portion has several annular shaped protrusions (73A,73B) in the state of protruding towards the side of connection portion from the flange plane. The protrusions are made to contact the gasket. An INDEPENDENT CLAIM is included for assembled battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the terminal portion of the secondary battery.    Battery can (1)    Electric power generation unit (2)    Current collecting plates (3A,3B)    Gasket (4)    Battery cover (5)    Terminals (7A,7B)    Flange portions (71A,71B)    Connection portions (72AS,72B)    Protrusions (73A,73B)