Calibration method of surface densitometer

Abstract

The invention discloses a calibration method of a surface densitometer. The calibration method of the surface densitometer comprises the following steps of (1) preparing a standard pole piece having acoating with a known surface density value formed on the surface, wherein the standard pole piece has a diameter larger than that of the spot formed by the radiation emitted by the radiation source of the surface densitometer to be calibrated; (2) placing the standard pole piece under the radiation source so that the standard pole piece completely covers the spot; (3) measuring the surface density of the standard pole piece by using the surface densitometer to be calibrated to obtain a surface density machine measured value of the standard pole piece; and (4) calibrating the surface densitometer to be calibrated according to the surface density machine measured value and the known surface density value. The calibration method can easily and efficiently calibrate the surface densitometer,and has the advantages of high accuracy and low cost loss.

Description

technical field [0001] The invention relates to the field of lithium battery production technology, in particular, the invention relates to a calibration method for a surface density measuring instrument. Background technique [0002] In order to ensure the accuracy and consistency of the coating film in the lithium-ion battery coating section, it is necessary to use an areal density measuring instrument to measure the areal density of the coating film on the surface of the pole piece. The areal density measuring instrument can use the absorption and backscattering effects of high-voltage ray tubes to measure the areal density of thin film materials in a non-destructive and non-contact manner. The equipment can be placed after unwinding of the coating machine and in front of the coating head to measure the areal density of the substrate to be coated; it can also be placed outside the oven and before rewinding to measure the areal density of the dried pole piece. [0003] Th...

AI Technical Summary

Problems solved by technology

[0004] The advantage of the calibration method of the traditional area density measuring instrument is that the average value of the area density measured by punching holes on the same pole piece is high, and the accuracy is high, but the disadvantage is that the operation is complicated, and it takes more than 4 hours to perform a calibration / calibration, and 10-20kg poles are scrapped. sheet, and the battery factory will perform multiple calibrations / checks for different areal density measurement equipment, different slurry systems, and single- and double-sided electrodes, and even for different types of current collectors. The attenuation and aging of the detection equipment need to be repeated, and the general cycle is 1 to 2 years. The resulting complex interaction leads to the scrapping of a large number of products, which consumes manpower, material resources and time costs. At present, the positive active materials in the market As prices continue to rise, companies need to reduce costs and reduce burdens in every detail

Therefore, the existing areal density measuring instrument calibration method still needs to be improved

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