BATTERY PACK

Adverse effects caused by a high-temperature exhaust gas ejected from an exhaust valve of a battery are suppressed to ensure safety. A battery pack includes battery cell (1) including the exhaust valve that opens when an internal pressure exceeds a set pressure and case (2) housing battery cell (1). Case (2) includes inner case (20) housing battery cell (1) and outer case (30) incorporating inner case (20), inner case (20) includes a plurality of inner smoke vent holes (27) through which the exhaust gas ejected from the exhaust valve passes, and outer case (30) includes a plurality of outer smoke vent holes (37) through which the exhaust gas including passed through inner smoke vent holes (27) passes. In a state where inner case (20) is disposed in outer case (30), inner smoke vent holes (27) and outer smoke vent holes (37) are disposed at positions not facing each other, and inner smoke vent holes (27) and outer smoke vent holes (37) are opened at positions allowing the exhaust gas to pass in different directions.