Lithium ion battery diaphragm thickness gauge boundary line positioning scriber

The utility model provides a lithium ion battery diaphragm thickness gauge boundary line positioning scriber, which comprises a graduated scale, a scribing block arranged on the graduated scale and in sliding fit with the graduated scale, a scribing head arranged on the scribing block and used for scribing, a sliding rod parallel to the graduated scale, and a laser gradienter arranged on the sliding rod and in sliding fit with the sliding rod. When the marking device is used, a laser level meter is used for positioning firstly, then a sheet is marked through the marking head on the marking block below a chilling roller of the casting process, and due to the fact that temperature difference exists between the point, making contact with the sheet, of the marking head and other positions, the appearance difference exists between the marking area of the sheet and other areas. Compared with a traditional method, marking does not need to be carried out after each machining procedure, the film breaking risk of a pro