BATTERY PACK AND METHOD OF ASSEMBLING BATTERY PACK

A battery pack includes a lower frame including a base plate, a first side plate connected to a first side of the base plate, and a second side plate connected to a second side of the base plate, and first and second battery assemblies on the base plate, and each of the first and second battery assemblies includes a cell stack including a plurality of battery cells and a first cross beam coupled to a first side of the cell stack and a second cross beam coupled to a second side of the cell stack.