BATTERY MODULE, BATTERY RACK COMPRISING SAME BATTERY MODULE, AND POWER STORAGE DEVICE COMPRISING SAME BATTERY RACK

Disclosed is a battery module, which includes a battery cell; a module case configured to accommodate the battery cell; and a fire extinguishing unit mounted to penetrate into the module case and connected to a fire extinguishing tank unit containing a fire extinguishing agent to directly inject the fire extinguishing agent into the module case when a thermal runaway or fire occurs at the at least one battery cell.