| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet lamination type lithium ion secondary battery in which, even when bent and curved, the occurrence of damage on an internal electrode and a separator is suppressed, and high battery characteristics can be maintained, and which is manufactured at a low cost and excellent in handleability.SOLUTION: A sheet lamination type lithium ion secondary battery includes: a membrane electrode assembly 10 formed by laminating a positive electrode sheet 12 in which a positive electrode active material layer is provided on a positive electrode current collector and a negative electrode 13 in which a negative electrode active material layer is provided on a negative electrode current collector via a separator 14; and a sheet type exterior body 20 in which this membrane electrode assembly 10 is housed inside and sealed. The exterior body 20 has an uneven shape 23 on the outer surface 20A side, and a heat seal layer 22 is provided on the inner surface sides 20B holding the membrane electrode assembly 10. |
