SECONDARY CELL

摘要

A secondary cell is provided with an electrode group that is charged with and discharges electricity, a can that has an opening and houses the electrode group therein, a lid that is welded to the opening of the can and seals the opening, a positive-electrode connection member and a negative-electrode connection member that each have one end electrically connected to the electrode group and the other end passing through the lid and protruding to the outside of the lid, and a positive-electrode external terminal and a negative-electrode external terminal that are respectively connected to the positive-electrode connection member and the negative-electrode connection member by caulking on the outside of the lid. In each of the positive-electrode connection member and the negative-electrode connection member, a caulked portion the diameter of which is enlarged is formed on the outside of the lid, and in the caulked portion, thin sections which can be laser spot welded are locally formed, and the thin sections are laser spot welded.