| 摘要 |
A secondary battery includes an electrode assembly with a positive electrode plate, a negative electrode plate, and a separator disposed between the positive and the negative electrode plates. A can in which the electrode assembly is mounted has an opening portion. A cap assembly is mounted at the opening portion of the can to seal the can. The cap assembly has a cap plate fitted to the opening portion of the can, and the hardness of the can is greater than the hardness of the cap plate.
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