Patent ID: 11791513

Abstract:
A battery includes a negative electrode can that is formed into a topped cylindrical shape. A negative electrode can circumferential wall portion includes a double cylinder portion that extends from an opening edge of the negative electrode can toward a top portion, and a step portion that connects the top portion to the double cylinder portion. The step portion includes a first curved portion that extends to a lower side from an outer circumferential edge of the top portion, a second curved portion that extends to an outer side of a radial direction from the first curved portion, and a third curved portion that extends to the lower side from the second curved portion. The double cylinder portion includes an inner cylinder portion that extends to the lower side from the third curved portion, and an outer cylinder portion that surrounds the inner cylinder portion from the outer side of the radial direction. A gasket is arranged on an outer side of the outer cylinder portion in the radial direction and on an upper side. An upper end edge of the outer cylinder portion is positioned further on the upper side than a center between both ends of the negative electrode can in an axial direction and is positioned further on the lower side than an upper end edge of the third curved portion.