A system for finding black spots in a separator according to an embodiment includes a winding machine (11) and a rewinder (12) that take out and wind a separator from a rechargeable battery cell to produce and supply a sample of the separator; a foreign ma...

[Object] To provide a battery cleaning device that removes foulants from the surfaces of battery cells. [Means for Solving] A battery cleaning device 100 has a cleaning roller 102 for cleaning a flat surface 14 of a battery cell 10 to be roller-pressed, th...