An overcharge protection apparatus with minimized power consumption, comprising: a first relay including a first coil and a first switch, wherein the first coil is provided with relay control signal and the first switch being configured such that when current flows through the first coil, the first switch is closed, whereas when current does not flow through the first coil, the first switch is opened, and such that the first switch is connected at a first end thereof to an anode of the battery cell; an overcharge prevention circuit including a voltage detection unit, a switching diode, a second relay, wherein the voltage detection unit connected between a second end of the first switch and a cathode of the battery cell and configured to detect the voltage of the battery cell, the switching diode connected at a first end thereof to the cathode of the battery cell, and configured to be shorted when the voltage of the battery cell detected by the voltage detection unit is equal to or greater than a reference voltage, and the second relay including a second coil connected between the second end of the first switch and a second end of the switching diode, and a second switch connected between a first end of the first coil of the first relay and a ground; and a main relay comprising a third coil and a third switch, the main relay being configured such that a first end of the third coil is provided with a relay control signal from a battery management system and a second end of the third coil is connected to a second end of the first coil, and such that a first end of the third switch is connected to the battery module and a second end of the third switch is connected to a charging power source. a first relay including a first coil and a first switch, wherein the first coil is provided with relay control signal and the first switch being configured such that when current flows through the first coil, the first switch is closed, whereas when current does not flow through the first coil, the first switch is opened, and such that the first switch is connected at a first end thereof to an anode of the battery cell; an overcharge prevention circuit including a voltage detection unit, a switching diode, a second relay, wherein the voltage detection unit connected between a second end of the first switch and a cathode of the battery cell and configured to detect the voltage of the battery cell, the switching diode connected at a first end thereof to the cathode of the battery cell, and configured to be shorted when the voltage of the battery cell detected by the voltage detection unit is equal to or greater than a reference voltage, and the second relay including a second coil connected between the second end of the first switch and a second end of the switching diode, and a second switch connected between a first end of the first coil of the first relay and a ground; and a main relay comprising a third coil and a third switch, the main relay being configured such that a first end of the third coil is provided with a relay control signal from a battery management system and a second end of the third coil is connected to a second end of the first coil, and such that a first end of the third switch is connected to the battery module and a second end of the third switch is connected to a charging power source.