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

Disclosed is a battery module, which includes at least one battery cell; a module case configured to accommodate the at least one battery cell; a fire extinguishing unit disposed at least partially inside the module case and connected to a fire extinguishing tank unit containing a fire extinguishing agent to inject the fire extinguishing agent directly into the module case when a thermal runaway or fire occurs in the at least one battery cell; and an insulation cover configured to cover the fire extinguishing unit at least partially and disposed at least partially inside the module case.