Patent ID: 11329348

Abstract:
A cylindrical battery cell includes an electrode assembly of a cathode/separator/anode structure and an electrolyte disposed in a battery case, a cylindrical metal container forms the battery case with the electrode assembly and the electrolyte disposed therein, a cap assembly is mounted on the open upper end of the metal container and a gasket of an elastic material is interposed between the metal container and the cap assembly. The upper end of the metal container is clamped and bent inward toward the central axis of the battery cell to enable the upper portion of the metal container to surround the exterior surface of the gasket. A recessed groove configured to partially receive the gasket by clamping, is formed on the interior surface of the inward-bent portion of the metal container. Accordingly, damage to the gasket interposed between the metal container and the cap assembly is reduced and inhibits electrolyte leakage.