Battery module assembly having stable fixing means for unit module

A battery module assembly comprising:

• a module array body including two or more unit modules, each including a plurality of battery cells, the unit modules being arranged while sides thereof are closely attached to each other;
• and
• a combination-type module housing that includes a first space set by combining a plurality of plate members, and a second space set in the first space while a fixing bracket is additionally combined to one of the plurality of plate members,
• wherein a module array body is mounted in the first space of the module such that the unit modules are supported by the plate members, and a part of the module array body is fixed to the module housing while being inserted into the second space.