Flat wound power storage device cell and flat wound power storage device module

摘要

A flat wound power storage device cell and a flat wound power storage device module having a compact cell and module width with respect to the wound axial direction are obtained. The positive electrode current collector foil has a margin where the positive electrode layer is not formed at a position where it does not overlap with the negative electrode current collector foil, and the negative electrode current collector foil has a blank space where no negative electrode layer is formed at a position where it does not overlap with the positive electrode current collector foil. The remaining positive electrode terminal is positioned between the positive electrode current collector foil connecting part connected to the margin of the positive electrode current collector foil, the positive electrode terminal external extracting part, and the positive electrode current collector foil connecting part and the positive electrode terminal external extracting part and flattened. In-cell positive electrode terminal heat radiation part covering substantially half of one side of the wider side of the wound electrode part, negative electrode terminal is connected to negative electrode current collector foil margin, negative electrode current collector foil connection part, negative electrode terminal external extraction And a negative electrode current collector foil connection part and a negative electrode terminal external extraction part and an in-cell negative electrode terminal heat dissipation part that substantially covers the remaining part of one of the wider sides of the flat wound electrode part.