BATTERY PACK

The present invention relates to a battery pack, and the battery pack of the present invention is a battery pack configured to accommodate a battery module including a cell stack in which a plurality of cells are stacked, and includes a pack case including a base plate configured to support a lower portion of the battery module, a main partition wall coupled to a center portion of the base plate and formed to extend across the base plate, a side wall coupled along an edge of the base plate, and an auxiliary partition wall having both ends coupled to the main partition wall and the side wall, respectively, and a long bolt member coupled to the pack case by passing through the auxiliary partition wall such that the auxiliary partition wall is coupled to the main partition wall and the side wall.