Do you know how to detect the thickness of the lithium battery separator?

As one of the four major raw materials for lithium batteries, diaphragm plays a pivotal role in the safety, cycle life, discharge rate and other performance of lithium batteries, but its high technical threshold has discouraged many investors. Even though lithium battery separators have been made domestically, there are still many technical barriers to overcome. For example: At present, almost all diaphragm thickness measurement equipment in China only has the detection function, and few can achieve the closed-loop control of the diaphragm thickness. The uniformity of the thickness of the lithium battery separator includes the uniformity of the longitudinal thickness and the uniformity of the lateral thickness, but in comparison, the lateral thickness uniformity is more important, and generally must be controlled within 1um. 1. A single X-ray ensures the accuracy of the online diaphragm thickness detection. The principle of online diaphragm thickness detection is to convert the attenuation of the ray through the diaphragm into the thickness of the diaphragm. This means that the accuracy and stability of the detection must be ensured during the detection process. 2. On-line control technology of diaphragm thickness. There are two important on-line control technologies for lithium battery diaphragm thickness, one is MD (longitudinal) control and CD (transverse) control; the other is diaphragm online machine vision inspection technology. 1) MD control and CD control The so-called MD control and CD control refer to the closed-loop control of the thickness in the MD direction by controlling the speed of the feeding screw or the traction speed; and the data measurement through the scanning frame, and finally the closed-loop control of the data in the CD direction. . The key technology is the CD banner alignment technology, that is, the inspection data of the scanning frame must be accurately aligned with the position of the full-width die. In addition, the shrinkage factor of the film must be considered. Only the alignment can be controlled. Great. 2) Diaphragm online machine vision detection technology. It is known that the key to the lithium battery diaphragm is the identification of pinholes. Energy Storage has introduced pinhole recognition technology for diaphragm detection, which is a technology to distinguish pinholes and bright spots through multi-channel imaging exposure. . In addition to pinhole recognition, it also has other intelligent classification functions, that is, intelligent classification algorithms. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Which specific methods are used for the correct use of lithium batteries?