Abstract: A jig used for welding a cylindrical battery, which is a jig for welding a collector plate electrically connected to an electrode assembly of a cylindrical battery cell to a battery can, may include: a main body configured to come into contact with the collector plate to press the collector plate and having a through-hole for welding; and a position determination portion coupled to at least one of both ends of the main body to come into contact with an end of the collector plate, and configured to cause the collector plate to be fixed at a correct position during welding. A method of manufacturing a cylindrical battery and cylindrical battery made by the method are also provided.

Abstract: An electrolyte injection O-ring and a cylindrical battery manufacturing method using the same are provided. The electrolyte injection O-ring includes a body portion having an open top end and an open bottom end and defining a cavity along a central axis; and a diameter-enlarged portion extending from a lower portion of the body portion along a centrifugal direction and the central axis direction. The diameter-enlarged portion includes an outer circumferential surface surrounding the central axis. The diameter-enlarged portion deforms elastically when pressure is applied in the axial direction, so that a diameter of the outer circumferential surface increases in the centrifugal direction.

Abstract: An electric energy storage device in which a cell assembly having electrode leads is installed in a metal case. The electric energy storage device includes an internal terminal formed with a support, connection ribs and thorough portions, and the electrode leads include a part of electrode leads compressed by the support and the connection ribs of the internal terminal and a part of electrode leads located at the thorough portions of the internal terminal to maintain a shape thereof.

Abstract: An electric energy storage device has an inner terminal disposed in a cylindrical metal case and connected to an electrode of a bare cell, wherein the inner terminal includes a plate-shaped terminal body having a circular outer circumference; at least one electrolyte impregnation hole formed through the terminal body in a thickness direction; a flange located at the outer circumference of the terminal body and extending perpendicular to a plane of the terminal body; and a spacer formed to protrude at a periphery of at least one impregnation hole among the impregnation holes or formed by protruding a part of the plane of the terminal body.

Abstract: An electric energy storage device in which a cell assembly having electrode leads is installed in a metal case. The electric energy storage device includes an internal terminal formed with a support, connection ribs and thorough portions, and the electrode leads include a part of electrode leads compressed by the support and the connection ribs of the internal terminal and a part of electrode leads located at the thorough portions of the internal terminal to maintain a shape thereof.

Abstract: An electric energy storage device has an inner terminal disposed in a cylindrical metal case and connected to an electrode of a bare cell, wherein the inner terminal includes a plate-shaped terminal body having a circular outer circumference; at least one electrolyte impregnation hole formed through the terminal body in a thickness direction; a flange located at the outer circumference of the terminal body and extending perpendicular to a plane of the terminal body; and a spacer formed to protrude at a periphery of at least one impregnation hole among the impregnation holes or formed by protruding a part of the plane of the terminal body.