| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having high reliability that can increase the static friction coefficient μa between the outer side surface of an insulation film and a battery case, and suppress a defect caused by increase of a constraint load Fc.SOLUTION: A battery 1 comprises a metallic rectangular parallelepiped battery case 10, an electrode body 20 housed in the battery case 10, and an insulating member 30 which is formed of an insulating film 31 and interposed between the battery case 10 and the electrode body 20 to insulate both the battery case and the electrode body from each other. In the insulating film 31, the three-dimensional average surface roughness SRaA of the outer surface 31a in contact with the battery case 10 satisfies SRaA≥0.15, and the three-dimensional average surface roughness SRaB of the inner surface 31b in contact with the electrode body 20 satisfies SRaB≥0.03 and satisfies SRaA≥SRaB.SELECTED DRAWING: Figure 1 |
