BATTERY PACK

A battery pack includes a pack housing 110 having an internal space 115 in which a plurality of battery modules are installed or a plurality of battery cells are installed directly without being modulized; and a venting member 130 installed in the pack housing 110 and configured to discharge gas generated in the internal space 115 externally, wherein the venting member 130 is configured such that a cross-sectional area A1 of an outlet side 132 of the venting member connected to an external space of the pack housing 110 is smaller than a cross-sectional area A1 of an inlet side 131 of the venting member connected to the internal space 115.