The invention discloses a button battery for improving the utilization rate of radial space, which comprises a metal housing and an electric core arranged in the metal housing, wherein the electric core comprises a positive plate and a negative plate. The button battery further comprises a cover plate arranged on the metal housing, wherein the cover plate and the metal housing have the same polarity, and the cover plate and the metal housing are welded into a whole by laser, so that the sealing property of the battery housing is more reliable. The outer side of the cover plate is provided witha convex cap, the cover plate and the cap are provided with an insulating piece therebetween which prevents a short circuit between the cover plate and the cap, one of the positive plate and the negative plate is electrically connected with the metal housing or the cover plate, the other of the positive plate and the negative plate is electrically connected with the cap, and the electric core andthe outside are only separated by the single-layer metal housing, so that the utilization rate of the radial space of the battery is improved. Meanwhile, the process of the button battery is simpler,the requirement of full-automatic production of the battery is met, the production efficiency of the battery is improved, and the qualification rate is also well guaranteed.