| 摘要 |
A lithium-ion secondary battery which includes a battery element and an exterior package covering the battery element. The battery element includes a separator, and an electrode-stacked body having a first electrode and a second electrode disposed respectively on both surfaces of the separator in a stacking direction. The exterior package includes a first package member located at one side of the battery element in the stacking direction, and a second package member located at the other side of the battery element in the stacking direction. A linear expansion coefficient ±1 of the first package member is greater than a linear expansion coefficient ±2 of the second package member. |
