LARGE-SIZED BATTERY MODULE AND BATTERY PACK INCLUDING SAME

Provided is a battery module including: a cell stack structure including a plurality of unit stacks each including stacked battery cells; a module housing accommodating the cell stack structure; and a structural reinforcement beam arranged in parallel with the battery cells and arranged between adjacent unit stacks, wherein upper and lower end portions of the structural reinforcement beam are respectively partially inserted into and fixedly coupled to an upper surface and a lower surface of the module housing such that the unit stacks are spatially spaced apart from each other.