Battery pack

A battery pack (110) includes at least one battery module (100) having a plurality of battery cells (10); and a housing accommodating the at least one battery module (100) and having an inlet port (731) at a first side thereof and outlet port (741) at a second side thereof opposite to the first side, the housing having a bottom plate that has a slope portion (722) and a first hole for draining condensed water (724) at an end of the slope portion (722).