Tool and method for detecting flexibility of pole sheet after surface coating

Abstract

The invention provides a tool for detecting the flexibility of a pole sheet after surface coating. The tool comprises a feeding platform for placing a pole sheet, a measuring platform for measuring the flexibility of the pole sheet, and a pressing roller assembly, wherein the feeding platform and the measuring platform are sequentially and horizontally arranged, the pressing roller assembly comprises an upper pressing roller and a lower supporting roller which are arranged in an up-down spaced mode, the upper pressing roller and the lower supporting roller are located above and below the feeding platform respectively, and the rotating direction of the upper pressing roller is opposite to that of the lower supporting roller. The invention further provides a method for detecting the flexibility of a pole sheet by using the detection tool, wherein the flexibility of the pole sheet after surface coating can be judged and detected, the probability of belt blockage and wrinkling of the polesheet is reduced, the experimental investment is reduced, the method is suitable for batch detection of a mass production line, and whether drying parameters of surface coating cloth are reasonable can be reversely deduced.

Description

technical field [0001] The invention belongs to the field of power battery pole piece manufacturing, and in particular relates to a testing tool and method for the flexibility of a surface-coated pole piece. Background technique [0002] The safety performance and service life of lithium-ion batteries have always been the focus of everyone's attention, especially the rapid development and application of power batteries have made people more concerned about the safety performance and service life of lithium-ion batteries, and it is more urgent to improve the performance of power batteries. Lithium-ion battery professionals have also been making unremitting efforts, and the surface coating process of pole pieces came into being. [0003] In recent years, soft-pack laminated batteries have developed rapidly, and their main features are as follows. The energy density is 10-15% higher than that of steel-cased batteries of the same specification and size, and 5-10% higher than tha...

AI Technical Summary

Problems solved by technology

[0004] Due to the thin surface coating and the influence of the active material coating, it is impossible to detect whether the surface coating is effectively dried by using the traditional method of detecting volatiles, and the trace amount of NMP not only affects the final battery performance. impact, and has a huge impact on the flexibility of the pole piece, which directly causes the pole piece to be blocked and scrapped during the die-cutting process.

[0005] Patent CN207675691U A kind of NMP gas intelligent monitoring system can detect NMP content, but uses gas sensor, the cost is high, and regular maintenance cost is high; CN104535689A A kind of gas chromatography detection of N-methylpyrrolidone content in lithium ion battery pole piece The method can quantitatively measure the NMP content, but the equipment cost is high, and it can only be used for scientific research, and it is not suitable for mass production line batch detection; CN 109443947A, CN110455642A respectively use the minimum needle diameter φ and the sagging height of the pole piece Judging the flexibility of pole pieces, but only applicable to the judgment of rolling and winding pole pieces, not applicable to the die-cutting process of laminated batteries, and even more inapplicable to pole pieces with surface coating

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