Battery Pack and Device Including the Same

A battery pack includes a first pack case, a second pack case, and an inflow port. The first pack case is for mounting a plurality of battery modules that house a battery cell stack. The second pack case is disposed while covering the battery module. The inflow port is provided at an upper end of the second pack case and is connected to a flow path that transmits a fire extinguishing liquid injected from the outside. A device including the same is also provided.