| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage element capable of improving uniformity of a stress that an electrode body receives from a container.SOLUTION: A power storage element 10 comprises an electrode body 400 formed by winding a positive electrode, a negative electrode, and a separator around a winding shaft. The electrode body 400 comprises a core material 410 arranged inward on an innermost periphery of the positive electrode, the negative electrode, and the separator that are wound around, and the core material 410 has lower rigidity at its longitudinal ends on its cross section vertical to the winding shaft than at its longitudinal center part. |
