BATTERY PACK

A battery pack includes battery cells adjacent to each other, each of the battery cells including a vent portion, cooling channels penetrating between adjacent ones of the battery cells, a cell holder to accommodate the battery cells, the cell holder including hollow protruding portions surrounding the cooling channels, respectively, and protruding away from the battery cells, and a separation member on the cell holder, the separation member including open areas opened to accommodate the hollow protruding portions inserted therein, respectively, and a shield area that closes above the vent portion.