Bus bar assembly, battery pack comprising bus bar assembly, and vehicle comprising battery pack

Discussed is a battery pack, which can include a plurality of battery cells arranged along a longitudinal direction and a width direction of the battery pack, and a bus bar assembly disposed at one side of the plurality of battery cells and configured to electrically connect the plurality of battery cells. The bus bar assembly includes a connection bus bar connected in series and in parallel to adjacent battery cells of the plurality of battery cells in the longitudinal direction and the width direction, and a fusing portion formed in the connection bus bar and configured to block an electrical connection of a battery cell in which an abnormal situation occurs in both serial and parallel connection directions from among the plurality of battery cells.