BATTERY PACK COMPRISING EXTINGUISHMENT UNIT

Disclosed is a battery pack having a reduced risk of secondary ignition or explosion. The battery pack includes at least two battery modules arranged in one direction; and a fire extinguishing unit having a linear temperature sensor partially extending linearly along the at least two battery modules and configured to sense whether at least one of the at least two battery modules has a temperature over a predetermined temperature, a fire extinguishing tank configured to accommodate a fire extinguishing agent therein, a pipe connected to the fire extinguishing tank to supply the fire extinguishing agent from the fire extinguishing tank to each of the at least two battery modules, and a valve opened to supply the fire extinguishing agent from the fire extinguishing tank to the battery module over the predetermined temperature.