Battery and current collector

Abstract

According to the present invention, a cylindrical battery comprises: an electrode assembly in which a long negative electrode, having a core body exposed section in which a negative electrode core body is exposed on one side in the width direction thereof, and a long positive electrode are wound with a separator therebetween; and a lower current collector which has a flat part that axially overlaps a central portion of a hollow section of the electrode assembly and does not have a through-bole, a protruding bead part to which the core body exposed section is joined, and one or more through-holes positioned on a further outer circumferential side in the radial direction than the flat part and further inside in the radial direction than the protruding bead part.

Dependencies are inferred from the claim text.