| 摘要 |
<p>Disclosed is a cylindrical secondary battery that can improve pressing force of a gasket pressing a cap up and a safety vent. The cylindrical secondary battery prevents leakage of electrolyte by improving pressing force of the gasket by including a cap up whose terminal portion is formed thicker than the peripheral portion. By using the cap up of the above structure, a curled portion is formed at the edge of the cap up or safety vent so as to surround the end of the safety vent or cap up. Thus, internal resistance can be reduced when the vibration or external impact is applied to the battery, and assembly errors can be prevented.</p> |
