NOVELTY - The battery has an electrode assembly (10) comprising a positive electrode (11), a separator (12), and a negative electrode (13). A positive current collecting plate (40) comprises a side connected to the positive electrode in a case (20) and another side is connected to a cap assembly (30). An insulator (60) in the case is adjacent to an end plate. A negative current collecting plate (50) comprises a side connected to the negative electrode and another side is adjacent to the insulator and connected to the end plate, which is curved convexly towards an inner cavity of the case.    USE - Secondary battery. Uses include but are not limited to small portable electronic devices e.g. cellular phone, laptop computer and camcorder and used as a power supply for driving motor in a hybrid electric vehicle.    ADVANTAGE - The current is interrupted by disconnection of a connection portion before explosion, thus preventing the explosion effectively. The connection portion is designed so as to be disconnected under a predetermined operating pressure, thus reducing the dispersion of the operating pressure of a disconnection portion. The disconnected state of the connection portion is firmly maintained even when the internal pressure of the case decreases as the connection portion between a bottom of the case and a negative current collecting plate is disconnected and the bottom of the case is broken outwards, thus improving reliability with respect to current interruption.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a secondary battery having a current interrupt device between a negative current collecting plate of the secondary battery and a case of the secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional perspective view of a secondary battery.    Electrode assembly (10)    Positive electrode (11)    Separator (12)    Negative electrode (13)    Case (20)    Cap assembly (30)    Positive current collecting plate (40)    Negative current collecting plate (50)    Insulator (60)