Defect inspection device, defect inspection method, manufacturing method of separator wound body, and separator wound body

摘要

PROBLEM TO BE SOLVED: To inspect existence of a defect inside a separator wound-body by a small number of defect inspection devices after slit of a separator used for a battery.SOLUTION: A defect inspection device 1 has a radiation source part 2 having a retention mechanism 20 for retaining a separator wound-body 10 wound after slit, the radiation source part 2 configured to apply an electromagnetic wave such as an x-ray or a gamma-ray to the separator wound-body, and a sensor assembly 3 configured to detect an electromagnetic wave applied from the radiation source part and transmitted through the separator wound-body. A structure is not arranged between the separator wound-body and a detection surface 3a of the sensor assembly.SELECTED DRAWING: Figure 3