BATTERY PACK WITH A REINFORCING MEMBER

Disclosed herein is a battery pack including a battery module array having battery modules which are arranged in the lateral direction in two or more rows, each of the battery modules being configured to have a structure in which battery cells or unit modules, each of which has two or more battery cells mounted therein, stacked in a state in which the battery cells or the unit modules are vertically erected, a base plate on which the battery modules are stacked in a vertically erected state, a pair of main members provided at the front and rear of the battery module array to support load of the battery modules, opposite ends of each of the main members being fastened to an external device, a pair of end plates disposed in tight contact with the front and rear of the battery module array in a state in which the lower end of each of the end plates is fixed to the base plate, and supporting bars connected between upper parts or side parts of the end plates so as to interconnect and support the end plates, wherein a reinforcement member is coupled to side walls of the end plates or sides of the main members at the outer side of an outermost battery module of the battery module array to minimize deformation of the battery pack when the battery pack is vibrated in the front and rear direction.