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Judgment method for quality of battery pole piece to be tested

A technology for the battery to be tested and the battery pole piece, which is applied in the measurement of electrical variables, electricity measurement, measuring devices, etc., can solve the problems that the method of the quality of the battery pole piece cannot be applied in actual production, and the result has a large deviation, and achieves accurate judgment results. Simple and easy method

Inactive Publication Date: 2010-09-29
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing methods for judging the quality of battery pole pieces that cannot be applied to actual production and large deviations in results, and provide a method for judging the quality of battery pole pieces to be tested that is suitable for actual production and has accurate results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment is used to illustrate the method for measuring the quality of battery pole pieces provided by the present invention.

[0025] Lithium-ion battery negative electrode material (100 parts by weight of negative electrode active material artificial graphite, 5 parts by weight of binder polytetrafluoroethylene) and 40 parts by weight of solvent NMP are mixed uniformly to prepare negative electrode slurry, and the negative electrode slurry is evenly coated On the surface of copper foil, after drying, press to obtain 15 samples of negative electrode sheet. Using a gloss meter (Tianjin Qili Technology Co., Ltd., MN gloss meter, the test angle is 60 degrees or 80 degrees) to measure the glossiness of 15 negative electrode sheet samples are 1.1GS, 1.2GS, 1.3GS, 1.4GS , 1.5GS, 1.6GS, 1.7GS, 1.8GS, 1.9GS, 2.0GS, 2.1GS, 2.2GS, 2.3GS, 2.4GS, 2.5GS.

[0026]The above-mentioned 15 negative electrode sheet samples and 15 positive electrode sheets whose glossiness is 2.4G...

Embodiment 2

[0034] This embodiment is used to illustrate the method for measuring the quality of battery pole pieces provided by the present invention.

[0035] According to the same method as in Example 1, the negative electrode sheet sample is obtained, the glossiness of the negative electrode sheet sample is measured, the negative electrode sheet sample and the positive electrode sheet are formed into a battery, and the cycle performance of the battery is measured. The results are as shown in Table 2. Different Yes, the positive electrode sheet used is a positive electrode sheet with a glossiness of 2.3GS (the positive electrode material includes 100 parts by weight of the positive active material LiFePO 4 , 4 parts by weight binder PVDF, 4 parts by weight conductive agent acetylene black).

[0036] Table 2

[0037] Gloss (GS) of the negative electrode sheet sample

Battery capacity remaining rate (%)

1.1

60

1.2

80

1.3

83

1.4

83

1...

Embodiment 3

[0043] This embodiment is used to illustrate the method for measuring the quality of battery pole pieces provided by the present invention.

[0044] Lithium-ion battery cathode material (positive electrode material comprises 100 parts by weight of positive electrode active material LiCoO 2 , 4 parts by weight of binder PVDF, 4 parts by weight of conductive agent acetylene black) and 40 parts by weight of solvent NMP are mixed uniformly to prepare negative electrode slurry, which is uniformly coated on the surface of aluminum foil and pressed after drying to obtain 21 samples of the positive electrode. Using a gloss meter (Tianjin Qili Technology Co., Ltd., MN type gloss meter, the test angle is 60 degrees or 80 degrees) to measure the gloss of 21 negative pole piece samples are 1.1GS, 1.2GS, 1.3GS, 1.4GS , 1.5GS, 1.6GS, 1.7GS, 1.8GS, 1.9GS, 2.0GS, 2.1GS, 2.2GS, 2.3GS, 2.4GS, 2.5GS, 2.6GS, 2.7GS, 2.8GS, 2.9GS, 3.0GS, 3.1 GS.

[0045] The above 21 positive electrode samples a...

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PUM

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Abstract

The invention relates to a judging method for the battery pole shoe quality, which comprises the following steps: the glossiness of a battery pole shoe to be tested is measured, whether the glossiness of the battery pole shoe to be tested is in a glossiness range is judged, the cycle performance of the battery meets the requirement, wherein, the battery is made up of battery pole shoes, and glossiness of battery pole shoe is in the glossiness range. The method can judge the battery pole shoe quality by measuring the glossiness of the battery pole shoe to be tested; the method is simple and convenient to operate, and is adapted to application in practical production; in addition, the judgment is accurate.

Description

technical field [0001] The invention relates to a method for judging the quality of a pole piece of a battery to be tested. Background technique [0002] A battery such as a lithium-ion battery generally includes a casing, an electrode group and an electrolyte. The electrode group and the electrolyte are accommodated in the casing. The electrode group includes battery pole pieces, namely positive pole pieces and negative pole pieces. The performance of the battery depends largely on the quality of the battery pole piece, and the dispersibility and coating performance of the battery slurry are related to the quality of the battery pole piece. After the battery pole piece is produced, it is generally necessary to judge the quality of the battery pole piece. Only batteries assembled from qualified battery pole pieces can meet the requirements. The existing method of judging the quality of the battery pole piece is generally to measure the surface roughness of the battery pole ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01N21/57
Inventor 张伟清廖细英张天赐
Owner SHANGHAI BYD
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