BATTERY MODULE

A battery module includes: a battery cell having a cell vent; and a bus bar holder on the battery cell and having a module vent. The module vent has a flat first surface, a flat second surface opposite to the first surface and facing the battery cell, a vent hole extending between the first and second surfaces and facing the cell vent, and a plurality of bending guide grooves in a partial region of the first surface spaced apart from the vent hole.