Secondary battery, an electric vehicle, the power storage system, and a method for producing

The secondary battery includes a battery element which positive and negative electrode plates are laminated (20), said battery element (20) exterior body that houses with electrolytic solution (10) withdrawn from said outer body (10) electrode tabs of the positive electrode and the negative electrode (21, 25) and a further comprising, fusing unit that preferentially blown when part formed a predetermined current of the electrode tabs flows (25b), the electrode tabs out and a reinforcing member 33 mounted in a state apart from the outer body portion including at least the fusing unit (25b).