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1. A lithium ion secondary battery comprising:
a battery can; an electrode assembly in the battery can formed by rolling up a positive electrode, a separator and a negative electrode; an organic electrolyte solution in the battery can; a positive electrode lead in the battery can connected to the positive electrode; a negative electrode lead in the battery can connected to the negative electrode; an overcharge preventer in the battery can; a cap body sealing the battery can; a positive electrode terminal fixed to the cap body and connected to the positive electrode lead; and a negative electrode terminal fixed to the cap body and connected to the negative electrode lead, wherein the overcharge preventer comprises: a voltage detector configured to detect a voltage equal to or higher than a predetermined value between the positive electrode and negative electrode; a fuse body provided on the positive electrode lead or the negative electrode lead; a switch unit; and a driver configured to drive the switch unit, the fuse body and the switch unit are connected in series to constitute a short circuit for the electrode assembly, and when the voltage between the positive and negative electrodes reaches a predetermined value or higher in the case of charging, the driver is activated by a signal from the voltage detector to close the switch unit, and melt down the fuse body by energy accumulated in the electrode assembly.
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