Patent ID: 8822070

Claim:
A battery comprising: a battery element having a cathode and an anode wound about an axis extending in a first direction; a package containing the battery element and having an internal surface of a wall thereof electrically connected to one of the cathode and the anode; an external connection terminal being connected to the other one of the cathode and the anode, and having a plate-shaped base contained in the package and a leading portion extending to outside of the package; a cover member that closes an opening of the package and through which the leading portion of the external connection terminal extends; a lead extending from the other one of the cathode and anode to the plate-shaped base of the external connection terminal; and a single insulating member separating the external connection terminal from the battery element, wherein the single insulating member is the only insulating component that separates the external connection terminal from the battery element, wherein, the base of the external connection terminal is spaced from an internal wall face of the package, the insulating member extends in a second and third direction, both directions being orthogonal to the first direction, the second direction being a thickness direction of the package, and the third direction corresponding to a long axis direction of the package, wherein the insulating member has a first notch and a second notch positioned at opposite sides of the insulating member in the thickness direction, wherein the base of the external connection terminal is positioned substantially between the first notch and second notch in the thickness direction, the notches exposing the base of the external connection terminal to the internal wall face of the package, the leading portion of the external connection terminal extends from a center of the base of the external connection terminal, a distance between the base of the external connection terminal and the internal wall face of the package in the thickness direction is 1.20 mm or less, the notches are aligned with the external connection terminal in the thickness direction such that the notches are structured to receive an edge of the plate-shaped base of the external connection terminal in the thickness direction to enable the edge of the plate-shaped base to contact the internal wall face of the package, and the notches and the external connection terminal are substantially centered along the third direction of the package, wherein the plate-shaped base and the leading portion are a single piece.