BATTERY FIRE EXTINGUISHING DEVICE AND OPERATING METHOD THEREOF

A battery fire-extinguishing apparatus for preventing heat from spreading to an entire battery pack when fire occurs in some battery module includes a plurality of fire-extinguishing fluid storing units respectively located in a plurality of battery modules and configured to discharge fire-extinguishing fluid by heating, a plurality of resistor units respectively adj acent to the plurality of fire-extinguishing fluid storing units, and a control circuit configured to monitor voltage across both ends of the plurality of resistor units and increase current flowing through each of the plurality of resistor units when the voltage is higher than a reference voltage.