| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of efficiently suppressing heat generation inside a battery while suppressing manufacturing cost.SOLUTION: A lithium ion secondary battery includes an electrode comprising a positive electrode and a negative electrode, and normal charging and rapid charging charged with larger current as compared with the normal charging can be selectively performed in the lithium ion secondary battery. A rapid charging region where the rapid charging can be performed is set in a battery capacity region defined by a ratio of a remaining charge amount relative to a battery capacity. An electrode active material absorbing or desorbing lithium ions in at least a part of the rapid charging region, among a plurality of electrode active materials contained in the electrode, performs an endothermic reaction during battery charge. |
