Battery pack minimized with mounting space for device

A battery pack, comprising:

• a base plate including one surface on which two or more battery module assemblies respectively having a plurality of battery cells arranged therein are mounted in a separated state from each other with a predetermined interval therebetween;
• a cover member mounted on one surface of the base plate while enclosing the battery module assemblies;
• and
• a reinforcement supporting member positioned at a separation part between the battery module assemblies while supporting a mounting state of the cover member for the base plate, the reinforcement supporting member including at least two supporting parts and a connection beam extending between the at least two supporting parts,
• wherein a height of each supporting part in a vertical direction is greater than a height of the connection beam in the vertical direction,
• wherein a space is provided between a portion of the connection beam and the base plate.