| 摘要 |
<p>The present invention relates to a secondary battery including a cap assembly that prevents a vent from cracking, prevents a gas from leaking, makes a break variation of the vent uniform and improves safety. The secondary battery comprises a cap assembly including a cap plate. The cap plate comprises a vent formed on one surface of the cap plate; and at least one a reinforcing portion formed at a region adjacent to the vent, on the opposing or same surface of the cap plate to the surface on which the vent is formed.</p> |
