Battery Pack Having Energy Density Increased by Improving Sensing Wire Bonding of Busbar

A battery pack includes a plurality of battery cells, a cell frame, a cell frame cover, a battery management system (BMS) including an integrated interconnected board (ICB), a busbar support portion, and a metal pad support portion. The cell frame accommodates the plurality of battery cells, and the cell frame cover is coupled to a first surface of the cell frame. The battery management system assembly is coupled to a second surface of the cell frame, and the busbar support portion is disposed on a first side surface of the cell frame cover, which is uneven. The metal pad support portion is disposed on a first side surface of the battery management system assembly, which is uneven. The busbar support portion and the metal pad support portion are coupled to each other in a coupling plane by alternate fit coupling.