| 摘要 |
<p>An embodiment of the present invention includes a can which includes an opening on one side, an electrode assembly which is stored in the can through the opening, and a cap plate which seals the opening. The cap plate includes a concave first side and a convex second side which are parallel to each other, and a first side and a second side which are flat and are connected to the first side and the second side. A first groove is formed in the length direction of the cap plate on the first side. The first groove is closer to the first side than the second side.</p> |
