| 摘要 |
A lithium ion secondary battery is provided. The battery comprises a cap assembly having a cap plate with a predetermined thickness and a predetermined ratio of the length of the long axis to the length of the short axis of the cap plate. This construction prevents deformation of the cap plate, which can occur during sealing of the electrolyte injection hole. The lithium ion secondary battery includes a jelly-roll type electrode assembly having first and second electrode plates and a separator positioned between the electrode plates. The battery further comprises a battery case for containing the electrode assembly, and a cap assembly having a cap plate comprising an alloy of aluminum and manganese. The alloy contains 2% or less manganese. The cap assembly includes a terminal portion coupled to the battery case to seal the case, and the cap assembly is electrically connected to the electrode assembly.
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