RECHARGEABLE BATTERY PACK

A rechargeable battery pack includes: a plurality of battery cells, each of the battery cells including a cell vent; a pack frame accommodating the battery cells and including a pack vent; and a pack cover coupled to the pack frame and covering the battery cells. The pack cover includes a first member formed of a first elongation material having a first elongation and a second member formed of a second elongation material having a second elongation that is larger than the first elongation.