Method and device for detecting moisture content of negative electrode sheet

Abstract

The invention provides a method and a detection device for detecting the moisture content of a negative electrode sheet. The method includes: obtaining a peel strength-moisture content characteristic model; obtaining the peel strength of the negative electrode sheet to be detected; according to the peel strength and the peel strength-moisture content characteristic model, The moisture content of the negative electrode sheet to be tested is obtained. The method for detecting the moisture content of the negative electrode sheet of the present invention is based on the relationship between the moisture content of the negative electrode sheet and the peel strength of the negative electrode sheet, and the moisture content of the negative electrode sheet can be obtained by detecting the peel strength of the negative electrode sheet, thereby reducing the physical harm to the operator and the detection cost. .

Description

technical field [0001] The invention relates to a method and a detection device for detecting the moisture content of a negative electrode sheet, belonging to the technical field of lithium ion batteries. Background technique [0002] In the production process of lithium-ion batteries, the moisture in the production environment must be strictly controlled, otherwise the moisture will react with the electrolyte, resulting in poor capacity, short life, or even direct scrapping of the product. Therefore, accurate detection of moisture in the negative electrode sheet is extremely important. [0003] At present, the detection method to negative plate moisture that is often adopted is to utilize the Karl-Fisher moisture analyzer to detect. At present, the following disadvantages are mainly contained in this detection method: 1) Karl-Fischer reagent is mainly composed of iodine, sulfur dioxide, pyridine The solution composed of sulfur dioxide and methanol, in which sulfur dioxide ...

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Problems solved by technology

[0003] At present, the detection method to negative plate moisture that is often adopted is to utilize the Karl-Fisher moisture analyzer to detect. At present, the following disadvantages are mainly contained in this detection method: 1) Karl-Fischer reagent is mainly composed of iodine, sulfur dioxide, pyridine The solution composed of sulfur dioxide and methanol, in which sulfur dioxide and pyridine are extremely volatile, is very harmful to the human body, especially when changing reagents, some operators have insufficient knowledge of the hazards of the reagents, and without any protective measures, There is a great safety hazard in pouring reagents in and out at will; 2) Karl Fischer actually has high requirements for freshness, and it must be stored in the dark to extend the storage period; 3) Calibration of the titer of Karl Fischer reagents Whether it is accurate or not is directly related to the accuracy of sample determination, so titer calibration should be carried out before sample testing every day, and the operation complexity is high; 4) The electrode is a key component of the Karl Fischer moisture analyzer. The pollution on the surface directly leads to the decrease of sensitivity, so sometimes although the pollution on the electrode cannot be seen, it can be observed that the reaction is slow, which directly affects the measurement accuracy

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