| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a power storage device capable of securing bottom strength in a case and preventing internal short-circuit even when foreign matter is generated in an electrode assembly.SOLUTION: A secondary battery 100 includes: an electrode assembly 20 in which a positive electrode 30 and a negative electrode 40 are laminated on each other via a separator 50; and a cylindrical case 10 having a bottom 11 in which the electrode assembly is housed. In a cross sectional surface of the bottom when viewed from the lamination direction of the electrode assembly, a thickness t1 of a central part 11A is smaller in comparison with a thickness t2 of both ends 11B, and a distance L between the bottom and the electrode assembly when viewed from the lamination direction of the electrode assembly becomes longer as it goes toward the central part from both ends.</p> |
