BATTERY PACK

The present disclosure provides a battery pack. The battery pack includes a plurality of battery cells arranged in a longitudinal direction, a heat insulating sheet between two adjacent battery cells, a first friction sheet that is between the heat insulating sheet and one battery cell of the two adjacent battery cells and includes both non-adhesive surfaces in direct contact with the heat insulating sheet and the one battery cell, and a restraining mechanism configured to provide a compressive force in the longitudinal direction from both ends of the plurality of battery cells. According to the battery pack of the present disclosure, a battery pack including a plurality of battery cells reduces an assembly cost and man-hours for assembling a large number of battery cells, while strengthening lateral stiffness and increasing impact resistance against an external impact applied in the transverse direction intersecting the longitudinal direction in which the battery cells are arranged.