Two-Cell Assembly and Battery Pack Including the Same

In one embodiment according to the present disclosure, a two-cell assembly includes a first battery cell and a second battery cell each having cell leads with opposite polarities on both ends in a length direction, and a pair of busbar blocks, each joined to the same-polarity cell leads of the first battery cell and the second battery cell on opposite sides, and each having a bolt hole extending in a height direction, and the first battery cell and the second battery cell are connected in parallel via the pair of busbar blocks