| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage element which allows thermal expansion of a shaft core, without increasing the number of components.SOLUTION: At the base of the fitting portion of a positive electrode member 13 and a negative electrode member 15, a taper is formed so as to increase the external dimension toward a power collecting portion. On the outer side face at both ends 9A, 9B of a shaft core 9, a pair of facing surfaces are formed to face in the radial direction of the shaft core 9. On the inner peripheral surface adjoining the openings 9a, 9b, an inward taper is formed and shaped so that the contour of the openings 9a, 9b has an elliptical shape having a short axis extending in a direction where the pair of facing surfaces are formed, and a long axis extending in a direction perpendicular to the direction where the pair of facing surfaces are formed. |
