DEVICE AND METHOD FOR BLOCKING CURRENT USING DISCONNECTOR

An energy storage system (ESS) including a plurality of battery modules and a battery protection unit, the battery protection unit includes a microcontroller (MCU) for controlling charge and discharge of the ESS, a first main contactor and a second main contactor connecting or disconnecting between the plurality of battery modules and an output terminal of the ESS under control of the MCU, and a disconnector disposed between the first main contactor and the second main contactor and connecting or disconnecting the plurality of battery modules, the first main contactor, and the second main contactor, the first main contactor and the second main contactor are turned on or off, by the MCU, depending on whether a predetermined voltage is applied.