Medium and large size battery module of vertical stacking structure

A battery module constructed in a structure in which secondary batteries or unit modules each having two or more secondary batteries mounted therein are horizontally stacked while the secondary batteries or the unit modules are vertically erected, wherein the battery module comprises:

• a base plate on which the unit modules are horizontally stacked while the unit modules are vertically erected;
• a pair of side plates fixed to the base plate at lower ends thereof such that the side plates are brought into tight contact with outer surfaces of the outermost unit modules;
• and
• a housing fixed to the base plate in a structure to surround the unit modules, the housing being provided at the inside thereof with supporting parts for supporting upper ends of the side plates, respectively.