Testing method for detecting thickness of aluminum layer at corner of punched aluminum-plastic film

Abstract

The invention provides a test method for detecting the thickness of an aluminum layer at the corner of a punched aluminum-plastic film, which belongs to the field of lithium batteries and comprises the following steps of: 1, preparing a sample, namely cutting off the corner of the punched aluminum-plastic film to be tested, and flattening the corner; 2, slicing: fixing the test sample piece in a horizontal pushing type slicing machine, carrying out die cutting on the test sample piece, and measuring the thickness of the section aluminum layer once every time the test sample piece is cut; step3, measurement: taking down the test sample piece after die cutting, observing the test sample piece under a video microscope, amplifying the test sample piece to a required multiple, adjusting the focal length, measuring and recording test data; and 4, repeating the step 2 and the step 3 repeatedly, and carrying out die cutting and measurement for multiple times. According to the method, the horizontal pushing type slicing machine serves as a die cutting tool, the aluminum-plastic film is accurately sliced multiple times, then the thickness of the aluminum layer of the cut-off surface is tested multiple times under a video microscope, the precision is high, operation is easy, pollution is avoided, and the risk point of the aluminum-plastic film after pit punching can be better evaluated.

Description

technical field [0001] The invention belongs to the field of batteries, relates to a lithium-ion battery of a new energy vehicle, and in particular relates to a test method for detecting the thickness of an aluminum layer at the corner of an aluminum-plastic film after punching a pit. Background technique [0002] With the rapid development of the electronics industry, the requirements for batteries are getting higher and higher, and the service life and safety of batteries have become the focus of research. Therefore, aluminum-plastic film, the packaging material for batteries, has also put forward higher and higher requirements. , Since the lithium battery electrolyte contains fluorine-containing substances, these fluorine-containing substances will decompose and produce hydrofluoric acid when they meet with water, which puts forward higher requirements for the corrosion resistance of the aluminum-plastic film. [0003] The thickness of the aluminum layer of aluminum-plast...

AI Technical Summary

Problems solved by technology

[0003] The thickness of the aluminum layer of aluminum-plastic film can be measured by X-ray and video microscope. However, due to the strong radiation of X-ray, it will cause radiation pollution. However, the ordinary grinding and polishing sample test can only detect the thickness of one point, which is not accurate. The test shows the weakest position of the corner of the aluminum-plastic film after the punching hole, and there is a large error in accurately evaluating the fragile point of the aluminum-plastic film after the punching hole

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