The present invention discloses a battery pack having improved stability against thermal runaway in a plurality of battery cells. A battery pack according to the present invention for achieving the above objective comprises: at least one cell assembly provided with a plurality of battery cells; an energy consumption unit configured to discharge the at least one cell assembly when thermal runaway occurs in at least one of the plurality of battery cells; and a storage unit configured to accommodate the energy consumption unit therein and to discharge at least a portion of the energy consumption unit to the outside when the energy consumption unit discharges the cell assembly.