Battery diaphragm surface defect detection method and system

Abstract

The invention discloses a battery diaphragm surface defect detection method. The method comprises the following steps of: modeling an acquired product image of a standard battery diaphragm; based on the modeling, obtaining a modeling result comprising a template image and a to-be-detected area; according to the determined to-be-detected area, comparing the to-be-detected product image with the template image to obtain an original defect list; based on defect types and position information, aggregating the obtained original defect list to obtain an aggregated defect list; and based on the aggregated defect list, outputting defects meeting a preset threshold in the aggregated defect list. According to the structural design of the method, the surface defects of a battery diaphragm can be efficiently and quickly detected; the method has the advantages of high efficiency, low cost, high accuracy, and can effectively detect the defects such as coating missing and spraying missing. In addition, the invention also discloses a battery diaphragm surface defect detection system.

Description

technical field [0001] The present application relates to the technical field of detection of surface defects of battery separators, in particular to a method for detecting surface defects of battery separators. In addition, the present application also relates to a detection system for surface defects of a battery diaphragm. Background technique [0002] In recent years, with the country's strong support for the new energy industry, power batteries, especially lithium-ion batteries, have developed rapidly due to their large capacity and repeatable charge and discharge characteristics. As we all know, the separator is one of the internal components of lithium batteries. Its main function is to isolate the positive and negative electrodes to prevent short circuits. At the same time, the micropores on the membrane allow lithium ions to pass through to form a conductive circuit during charging and discharging. The quality of the separator directly affects the safety of lithium ...

AI Technical Summary

Problems solved by technology

After each process, the product is randomly inspected manually, and the product is placed under a 100-power lens to observe whether there is any defect. This method has the disadvantages of high cost, low efficiency and missed product inspection;

[0007] Second, for leakage defects, as described in the patent "An On-line Anti-Leakage Detection Device" (application number 201921830754.4), a plurality of infrared emitters distributed along the width direction of the The infrared receiver corresponding to the transmitter detects a large area of ​​leak coating according to the intensity of the infrared light emitted by the infrared transmitter received by the infrared receiver. This method cannot realize the detection of the entire diaphragm on the one hand, and cannot detect the Small area leak coating, and infrared rays are easily interfered by film thickness;

Although this method uses image processing and analysis technology to realize the entire film surface inspection, due to production line or process differences, the defect characteristic value is not fixed, resulting in a narrow application range of sample files. Other types of defects such as pinholes, scratches, etc. There is no fixed shape for scratches and spray leaks, and the detection effect of this method is not good

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