Cylinder battery and battery pack

Abstract

A cylindrical battery characterized in that it comprises: a housing (10) wherein a receiving chamber is formed in the housing (10), wherein the housing (10) has a first wall along the axial direction of the cylindrical battery, the first wall having a first surface and a second surface opposite each other along the axial direction, wherein a groove (13) is formed in the first surface and a groove bottom wall (50) is formed in the remaining part of the first wall extending along the axial direction, wherein the groove bottom wall (50) forms a weak point that serves to release gas inside the receiving chamber in the event of thermal runaway; a battery cell (20) wherein the battery cell (20) is arranged in the receiving chamber and the first surface is the side of the first wall facing away from the battery cell (20);an electrical connecting element (40), wherein the electrical connecting element (40) is arranged in the receiving space, wherein the electrical connecting element (40) is electrically connected to the housing (10), wherein the electrical connecting element (40) is welded to the first wall and forms a weld mark (60), wherein the weld mark (60) is located in the groove (13).