A battery pack according to an embodiment of the present invention may include a plurality of battery modules including a battery cell stack where a plurality of battery cells are stacked, a module frame accommodating the battery cell stack, and a heat sink disposed below a bottom portion of the module frame. A pack frame may accommodates the plurality of battery modules. A refrigerant transmission bolt may couple the bottom portion of the module frame, the heat sink, and the pack frame. The pack frame may includes a pack refrigerant pipe for supply and discharge of a refrigerant. A connection conduit in the refrigerant transmission bolt may connects the pack refrigerant pipe and the heat sink.