BATTERY PACK

A battery pack includes: a plurality of battery cells arranged in rows that are parallel with a first axis, wherein the battery cells arranged in the rows adjacent to each other in a second axis crossing the first axis are forwardly or backwardly misaligned with each other with respect to the first axis; and a plurality of bus bars having a zigzag shape and forming a plurality of parallel modules by connecting corresponding ones of the battery cells arranged in the second axis in parallel.