| 摘要 |
PROBLEM TO BE SOLVED: To provide an electricity storage device in which a tab can be suitably welded with a conductive member.SOLUTION: A secondary battery includes an electrode assembly 14 in which a positive electrode 21 and a negative electrode 22 are laminated while a separator 23 is sandwiched therebetween. A negative electrode tab 32 is provided at an end part 22c of the negative electrode 22, and the negative electrode tab 32 is welded with a negative electrode conductive member 42. The negative electrode conductive member 42 has a wide width part 51 and a narrow width part 52 which have widths different from each other, and a portion P where the negative electrode tab 32 is welded with the negative electrode conductive member 42 is present in the narrow width part 52. |
