Sampling test method for testing moisture of lithium battery as well as sampling device

Abstract

The invention relates to the technical field of moisture test of a lithium battery, in particular to a sampling test device for moisture of a lithium battery. The device comprises a glove box; the glove box comprises a test cabin and a transition cabin; a moveable transition cabin inner cabin door is arranged between the test cabin and the transition cabin; a sampling mold upper punch, a samplingmold lower knife edge and a sample sheet receiving box are arranged on the middle part of the test cabin sequentially from top to bottom; the left side and the right side of the upper end of the testcabin are connected with a dried air inlet and a dried air outlet; and one side of the lower end of the test cabin is connected with a protective gas input port. After the method and the device are adopted, the moisture of the whole pole piece can be tested reasonably and rapidly by the normalized preparation method, and the method comprises the whole process of preparing a to-be-tested pole piece, sampling the pole piece and testing the pole piece. Furthermore, in the sampling process, the fact that a plurality of pole pieces with irregular area are shear by the traditional scissors and are put into a drift bottle is avoided; and sampling in the irregular environment in the past is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium battery moisture testing, in particular to a sampling test method and a sampling device for lithium battery moisture testing. Background technique [0002] Moisture is one of the main factors affecting the performance and safety of lithium batteries: out of control moisture not only leads to the decomposition of electrolyte lithium salt, but also has a bad influence on film formation and stability. Water is unfavorable to the formation of the SEI film of lithium-ion batteries, and has a certain impact on battery performance. With the increase of moisture, the first discharge capacity of the battery decreases, the internal resistance increases, the cycle performance decreases, and the battery bulges. Moisture control is one of the most important control conditions in the production process of lithium batteries. [0003] During the moisture test of the battery, the sampling speed and sampling volu...

AI Technical Summary

Problems solved by technology

[0003] During the moisture test of the battery, the sampling speed and the sampling volume have a great influence on the test results. The conventional sampling volume is usually less than 3g. The traditional sampling method is to use scissors to cut out multiple pieces of electrodes with irregular areas based on experience. This sampling method has a slow sampling speed and unstable sampling volume, which will affect the results of the battery moisture test

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