Battery cell bundle and battery cell assembly including the same

A battery cell bundle comprises a support member including a barrier wall including first and second sides extending from an end of the support member; a plurality of first battery cells disposed on the first side of the barrier wall and a plurality of second battery cells disposed on the second side of the barrier wall; and an internal busbar to electrically connect the plurality of battery cells to each other, wherein the internal busbar includes a first busbar to electrically connect the plurality of first battery cells to each other, and a second busbar to electrically connect the plurality of second battery cells to each other, and wherein a portion of the first busbar is electrically connected to a portion of the second busbar.