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1. A battery pack comprising: a power storage device; a cooling device, wherein the power storage device includes: a plurality of power storage cells stacked in one direction; a case made of a metal and housing the plurality of power storage cells; a filling portion made of an insulating and a thermally conductive material and filled in the case; and a bus bar that electrically connects power storage cells of the plurality of power storage cells to each other, wherein each of the power storage cells includes: a plurality of positive-electrode sheets stacked in the one direction, a plurality of negative-electrode sheets stacked in the one direction, a positive-electrode current collector plate connected to the plurality of positive-electrode sheets, a negative-electrode current collector plate connected to the plurality of negative-electrode sheets, and a laminated film covering the plurality of positive-electrode sheets, the plurality of negative-electrode sheets, a part of the positive-electrode current collector plate, and a part of the negative-electrode current collector plate, the positive-electrode current collector plate includes a positive-electrode protrusion shaped to protrude from the laminated film in an orthogonal direction orthogonal to the one direction, the negative-electrode current collector plate includes a negative-electrode protrusion shaped to protrude from the laminated film in the orthogonal direction, the plurality of power storage cells are stacked such that the positive-electrode protrusion in one power storage cell among the plurality of power storage cells and the negative-electrode protrusion in another power storage cell adjacent to the one power storage cell among the plurality of power storage cells face each other in the one direction, and the bus bar is shaped to extend in the one direction and connects the positive-electrode protrusion to the negative-electrode protrusion, the positive-electrode protrusion and the negative-electrode protrusion are each shaped into a flat plate orthogonal to the one direction, and the bus bar includes a positive-electrode contact portion that is in surface contact with the positive-electrode protrusion, a negative-electrode contact portion that is in surface contact with the negative-electrode protrusion, and a coupling portion shaped to extend in the one direction and couple an outer end of the positive-electrode contact portion to an outer end of the negative-electrode contact portion in the orthogonal direction, wherein the coupling portion includes a plurality of through-holes spaced apart and arranged at intervals in a direction orthogonal to both the one direction and the orthogonal direction, wherein the case has an opposing wall with an inner surface that faces an outer surface of the coupling portion in the orthogonal direction, wherein the cooling device is in contact with an outer surface of the opposing wall, and wherein the filling portion is in direct contact with each of: the positive-electrode protrusion, the negative-electrode protrusion, the positive-electrode contact portion, the negative-electrode contact portion, an inner surface and the outer surface of the coupling portion in the orthogonal direction, and an insulating sheet provided on the inner surface of the opposing wall of the case.
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