BATTERY PACK

A battery pack is disclosed. The battery pack includes a plurality of battery cells arranged back and forth in a first direction, each including a pair of main surfaces arranged to face each other in the first direction, connecting the pair of main surfaces to each other, and including upper and lower surfaces forming a pair of long sides facing each other, and first and second side surfaces forming a pair of short sides facing each other, first and second bus bars electrically connecting the plurality of battery cells to each other, and electrically connecting the battery cells alternately arranged so as not to be adjacent to each other in the first direction on the first and second side surfaces, respectively, and a third bus bar that electrically connects first and second output terminals formed together on a front side of the plurality of battery cells in the first direction and adjacent battery cells to each other by detouring a rear side of the plurality of the battery cells. According to the present disclosure, provided is an advantageous battery pack which may be easily electrically connected to a set device, has a simplified structured with improved electrical output, may eliminate interference between a cooling structure and an electrical connection structure, and is favorable for slimming.