Diaphragm powder falling detection device and detection method thereof

Abstract

The invention discloses a diaphragm powder falling detection device and a detection method thereof. The device comprises a detection platform and a friction assembly arranged on the detection platform. The friction assembly comprises a friction block, a supporting frame used for installing the friction block and a friction driving assembly used for controlling the friction block to move at a certain speed. The detection platform is provided with a placing position used for placing a diaphragm sample to be detected; the supporting frame is installed above the placing position; the friction block is installed on one side, facing the placing position, of the supporting frame; and during detection, the lower surface of the friction block is in abutting contact with the upper surface of the diaphragm sample placed at the placing position. According to the invention, the specific friction block is adopted; and the friction block rubs the surface of the diaphragm sample at a specific pressureand speed, so that subjective errors caused by different individuals during manual detection are avoided, the consistency and the accuracy of a test result are improved, the improvement of the diaphragm coating quality in the later period is facilitated, and the production quality of a lithium battery is further improved.

Description

technical field [0001] The invention relates to the technical field of diaphragm production, in particular to a diaphragm powder drop detection device and a detection method thereof. Background technique [0002] The cell structure of a lithium battery consists of a positive electrode, a negative electrode, and a diaphragm. The diaphragm plays the role of blocking the positive and negative electrodes to prevent the battery from short circuiting. In the diaphragm production process, coating is an extremely important part. In the process, ceramic materials, adhesives and other substances are coated on the surface of the diaphragm substrate to form a coating. When the coating quality of the surface coating of the diaphragm is poor, there will be powder falling, which will cause the falling dust particles to pierce the diaphragm when the diaphragm is wound, and will not be able to separate the positive and negative electrodes. Therefore, the surface of the diaphragm The coating...

AI Technical Summary

Problems solved by technology

When the coating quality of the surface coating of the diaphragm is poor, there will be powder falling, which will cause the falling dust particles to pierce the diaphragm when the diaphragm is wound, and will not be able to separate the positive and negative electrodes. Therefore, the surface of the diaphragm The coating quality of the coating directly affects the production quality of lithium battery cells

[0003] At present, to detect whether the diaphragm has lost powder, it is usually to touch the surface of the diaphragm with a finger under a certain pressure, to see if there is white on the finger, and to judge the degree of powder loss by the depth of the white, which has the following problems: 1. Different people The force used is different, and the judgment results are different; 2. The roughness of different people's fingers is different, and the possibility of touching the white powder is different, and the judgment results are different; 3. The degree of powder falling is judged by the color depth, which is very subjective. human error

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