BATTERY PACK

The present technology relates to a battery pack capable of quickly extinguishing a fire. Specifically, the battery pack of the present technology includes a pack case including a base plate including a plurality of module regions each having the battery module located therein, a side wall extending along an edge of the base plate and vertically coupled to the base plate to surround the module regions, and a partition wall coupled to the side wall and configured to partition the base plate to form the plurality of module regions, wherein the side wall includes a gas-filled part that is filled with a high-pressure extinguishing gas therein and corresponds to the module region, a discharge port that is open to allow the gas-filled part to communicate with the module region, and a sealing plate coupled to the discharge port to seal the extinguishing gas, wherein the sealing plate is coupled to the discharge port so as to be separable in response to a temperature change in the module region.