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Moisture detection device for lithium battery pole pieces and detection method thereof

A detection device and detection method technology, applied in the field of lithium ion batteries, can solve the problems of inability to accurately measure the moisture of the pole piece, the influence of moisture test, and the selection of a single pole piece, and achieve easy quality control standards, ensure size uniformity, Accurate test results

Inactive Publication Date: 2016-08-31
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most pole piece testing methods mainly use a moisture tester to test the moisture content of randomly selected pole pieces to be tested in a drying room. The internal operation will still affect the moisture test and cause the test to be inaccurate

Method used

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  • Moisture detection device for lithium battery pole pieces and detection method thereof
  • Moisture detection device for lithium battery pole pieces and detection method thereof
  • Moisture detection device for lithium battery pole pieces and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a detection device for testing the moisture content of the pole piece of a lithium battery includes a glove box 1, and the inside of the glove box 1 is provided with a sampling table 11, an electronic scale 16 and at least two places for placing the pole piece sample 19. Test bottle 18; said test bottle 18 is respectively connected with conduit 24 and dry air pipe 17, and one end of said conduit 24 is connected with test bottle 18, and the other end is connected with reactor 2; said reactor 2 is connected with tester by electric wire 32 3 connections.

[0032] In a further solution, a puncher 13 is installed on the upper end of the sampling platform 11 , and the puncher 13 is connected to the top of the glove box 1 through a cylinder 14 .

[0033] In a further solution, the cylinder 14 is connected to the top of the glove box 1 through the fixing plate 15 , and the piston end of the cylinder 14 is connected to the puncher 13 .

[0034] The r...

Embodiment 2

[0039] Such as figure 1 As shown, the method for detecting the moisture in the lithium battery pole piece by using the above-mentioned detection device includes the following steps:

[0040] (1) Punch holes from different positions of the winding core 12 by using a puncher 13 to obtain at least two pole piece samples 19;

[0041] (2) Place the pole piece samples 19 in electronic scales 16 to weigh them;

[0042] (3) Place the pole piece samples 19 in the test bottle 18 respectively, and pass dry gas into the test bottle 18 by opening the regulating valve 25, so as to introduce the moisture contained in the pole piece sample 19 in the test bottle 18 into the reaction Carry out chemical reaction in device 2;

[0043] (4) During the chemical reaction, the electricity generated by electrolysis is transmitted to the moisture meter 3 through the electric wire 32. After the reaction, the moisture meter 3 calculates the total amount of moisture in all pole piece samples 19 through t...

Embodiment 3

[0048] In a dry environment, take a sample of a coil core that has completed the baking operation, obtain 25 pole piece samples and weigh them, and 5 of them are directly tested by a moisture tester in the drying room according to the existing method. Carry out moisture test, test result is as shown in Table 1; Other 20 samples are randomly divided into five groups, every group of 4 samples, adopt detection device of the present invention to carry out moisture test to 5 groups respectively, test result is as shown in Table 2:

[0049] Table 1 The moisture value of a single sample directly detected by the moisture tester

[0050]

[0051] Table 2 The moisture value of a single sample detected by the detection device of the present invention

[0052]

[0053] Comparing Tables 1 and 2, it can be seen that Table 1 is tested by a moisture meter, and its test result fluctuates greatly, and the test result is inaccurate; Table 2 uses the detection device of the present invention ...

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Abstract

The invention discloses a moisture detection device for lithium battery pole pieces and a detection method thereof. The device comprises a glovebox, inside which a sampling bench, an electronic scale and at least two test bottles for placing pole piece samples are arranged. The test bottles are respectively connected to a conduit and a dry windpipe. One end of the conduit is connected to the test bottle, and the other end of the conduit is connected to a reactor, which is connected to a tester through an electric wire. Dimension uniformity and diversity of pole piece samples to be detected are guaranteed by punching sampling at different positions of roll core through a puncher. Meanwhile, multiple parallel test bottles are adopted to test pole pieces at different positions of the roll core, and an average value of the pole pieces is calculated through a moisture tester. The method has advantages of consistent sampling size and simple operation. By the method, the average value of moisture at different positions of the roll core can be directly detected, the moisture detection of lithium battery pole pieces is more accurate, and the quality control standard can be easier to adjust. The method of the invention can be widely promoted.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a detection device and a detection method for the moisture content of a pole piece of a lithium battery. Background technique [0002] In the manufacturing process of lithium-ion batteries, moisture from the air, raw materials, human body, packaging, etc. must be strictly controlled, because excessive moisture will lead to hidden dangers such as flatulence, low capacity, large internal resistance, and low cycle life of lithium-ion batteries. , so it is particularly important to accurately detect the moisture content of the battery pole piece. [0003] At present, most pole piece test methods mainly use a moisture tester to test the moisture content of randomly selected pole pieces to be tested in a drying room. The internal operation will still affect the moisture test and cause the test to be inaccurate. Therefore, there is an urgent need to find an accurate, s...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 陶星凌理想王方方
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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