BUTTON-TYPE SECONDARY BATTERY

The present invention relates to a button-type secondary battery, and more particularly, to a button-type secondary battery, which has strong coupling so that a gas that is harmful to the human body does not leak to the outside of the battery even though an excessive internal pressure is generated by the gas generated inside the battery, and an electrolyte does not leak to the outside of the battery, is improved in a vacuum ratio occupied by an electrode assembly within the battery to maximize battery capacity and energy density, and is simplified and convenient in manufacturing process to improve production efficiency.The button-type secondary battery according to the present invention relates to a button-type secondary battery, of which a diameter is greater than a height, comprises: an electrode assembly; a lower can in which the electrode assembly is inserted and on which a first screw thread is formed on an outer circumferential surface thereof; an upper can which is configured to cover an opening of an upper end of the lower can and on which a second screw thread corresponding to the first screw thread is formed on an inner circumferential surface thereof; and an insulator interposed between the upper can and the lower can to prevent the upper can and the lower can from being short-circuited, wherein the electrode assembly is formed by stacking a plurality of first electrodes, a separator, and a second electrode in a horizontal direction, and a first electrode tab extending from the first electrodes of the electrode assembly is in contact with the upper can.