Secondary battery module having protrusions on a barrier rib

A secondary battery module comprising:

• a plurality of unit batteries adjacently spaced apart from each other;
• and
• a barrier rib between adjacent unit batteries of the plurality of unit batteries, the barrier rib comprising a plate shaped base physically contacting a first unit battery of the adjacent unit batteries, and a plurality of protrusions on the base and physically contacting a second unit battery of the adjacent unit batteries,
• wherein a first protrusion of the plurality of protrusions is adjacent to and spaced apart from one protrusion of the plurality of protrusions in a first direction, and a second protrusion of the plurality of protrusions is adjacent to and spaced apart from the one protrusion in a second direction,
• wherein the barrier rib is configured to pass air between the first and second unit batteries of the adjacent unit batteries from an inlet side of the barrier rib to an outlet side of the barrier rib, and protrusions of the plurality of protrusions are in an array on the plate shaped base, the array comprising a plurality of first columns in a direction from the inlet side to the outlet side and a plurality of second columns adjacent the first columns, and the protrusions in the first columns being staggered from the protrusions in the second columns,
• wherein the one protrusion is in a first column of the plurality of first columns, the first and second protrusions are in a second column of the plurality of second columns that is adjacent the first column, and the secondary battery module meets the following formula:
• 30°≦β≦150°
• where β is, with respect to the one protrusion, the angle between the first direction and the second direction.