| 摘要 |
PROBLEM TO BE SOLVED: To achieve a secondary battery that is tough even when force is externally applied to the secondary battery, in order to solve such a problem that, in the case where a film is used as an exterior body of a secondary battery, the film has lower strength than a metal can, and a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery.SOLUTION: In a secondary battery, a cushioning material is provided in a region surrounded by an exterior body. Specifically, the cushioning material is arranged on the periphery of an electrode group that includes a positive electrode current collector, a positive electrode active material layer formed on at least one surface of the positive electrode current collector, a separator, a negative electrode current collector, and a negative electrode active material layer formed on at least one surface of the negative electrode current collector.SELECTED DRAWING: Figure 1 |
