BATTERY CELL

A battery cell includes: an electrode assembly; an exterior container; two electrode terminals provided on an upper surface of the exterior container and arranged side by side in a first direction; and an insulating sheet that is in a form of a film and that is provided on the outer surface of the exterior container. The insulating sheet has a folded portion that reaches the upper surface from a short side surface of the exterior container. The folded portion includes a peak portion and valley portions, the peak portion protruding from the short side surface side to the two electrode terminals side along the first direction, the valley portions being located on both sides with respect to the peak portion in a second direction orthogonal to the first direction, each of the valley portions being recessed toward a side away from the two electrode terminals.