| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical secondary battery superior in liquid water filling. SOLUTION: This cylindrical secondary battery formed by accommodating a group of spiral electrodes 5 in a cylindrical casing, satisfies the formula r/R is 0.09 or more, when an outer diameter of the group of spiral electrodes 5 is R, and an inner diameter of a central space part 8 is r. |
