A battery pack includes a battery module configured to accommodate a number of battery cells, and a lower protective cover including a lower panel detachably coupled to a lower portion of the battery module and a number of buffer parts on one surface of the lower panel. A structure of the lower protective cover of the battery pack may be improved to absorb an impact from a lower side of a vehicle. A cross-sectional shape of the buffer part of the lower protective cover may be changed to adjust and design an impact absorption value.