a prismatic type lithium secondary battery , including an electrode assembly including an anode plate , a cathode plate , and a separator wound together , a can to receive the electrode assembly via an opening in an upper end thereof , a cap assembly to seal the opening of the can , an insulating case mounted on an upper portion of the electrode assembly once the electrode assembly is inside the can , and a stopping unit , formed in sides of the can to protrude toward the interior of the can , including a support surface to support the cap assembly and a surface to engage with the insulating case .