NOVELTY - A nonaqueous electrolyte secondary battery comprises positive electrode plate including positive mix layer (11a) formed on positive electrode core, negative electrode plate including negative mix layer formed on negative electrode core, positive electrode terminal electrically-connected to positive electrode plate, negative electrode terminal electrically-connected to negative electrode plate, flat-shaped winding electrode wound in state by which positive electrode and negative electrode plates are insulated on both sides of separator (13), and nonaqueous electrolyte.    USE - Nonaqueous electrolyte secondary battery is used as power supply of electric vehicle and hybrid electric vehicle.    ADVANTAGE - The nonaqueous electrolyte secondary battery is safe to use during overcharging.    DETAILED DESCRIPTION - A nonaqueous electrolyte secondary battery comprises a positive electrode plate including a positive mix layer containing lithium carbonate formed on a positive electrode core, a negative electrode plate including a negative mix layer formed on a negative electrode core, a positive electrode terminal electrically-connected to the positive electrode plate, a negative electrode terminal electrically-connected to the negative electrode plate, a flat-shaped wound electrode wound to flat shape in state by which the positive electrode plate and the negative electrode plate are mutually insulated on both sides of a separator, a nonaqueous electrolyte and an exterior component. A wound positive electrode core exposure portion (15) is formed in one edge portion of the flat-shaped wound electrode component. A wound negative electrode core exposure portion (16) is formed in the other edge portion of the flat-shaped wound electrode component. The wound positive electrode core exposure portion and positive electrode electrical power collector are connected. The wound negative electrode core exposure portion and an anode collector are connected. At least one of the electroconductive paths between the positive electrode plate and the positive electrode terminal and electroconductive paths between the negative electrode plate and the negative electrode terminal include pressure sensitive-type electric current interruption unit. At least one surface of the positive electrode core exposure portion faces the separator. A porous protective layer (11b) is formed along the boundary with the positive mix layer.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic perspective view of end side of winding of the flat-shaped winding electrode component. (Drawing includes non-English language text)    Positive mix layer (11a)    Protective layer (11b)    Separator (13)    Flat-shaped winding electrode component (14)    Wound positive electrode core exposure portion (15)    Wound negative electrode core exposure portion (16)