Method and device for testing direct current internal resistance of battery, electronic equipment and storage medium

A technology of DC internal resistance and testing method, which is applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as inaccurate DC internal resistance, and achieve the effects of wide application range, stable test results, and strong consistency

Pending Publication Date: 2022-08-09
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the inaccurate defect of the DC internal resistance test of the battery by the discharge time method, the invention provides a test method, device, electronic equipment and storage medium for the DC internal resistance of the battery, which can accurately test the DC internal resistance of the battery

Method used

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  • Method and device for testing direct current internal resistance of battery, electronic equipment and storage medium
  • Method and device for testing direct current internal resistance of battery, electronic equipment and storage medium
  • Method and device for testing direct current internal resistance of battery, electronic equipment and storage medium

Examples

Experimental program
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Effect test

preparation example Construction

[0076] 2) Preparation of positive electrode sheet

[0077] a. Weighing: the positive electrode active material, the conductive agent and the positive electrode binder are weighed according to the mass fraction between them: 80-97%: 1-10%: 2-10%; The content is 40%-65%, and the homogenized slurry includes positive electrode active material, conductive agent, positive electrode binder and positive electrode solvent. (The solid content refers to the mass fraction, where the solid content is the ratio of the sum of the mass of the positive electrode active material, the conductive agent, and the positive electrode binder to the sum of the mass of the positive electrode active material, the conductive agent, the positive electrode binder, and the positive electrode solvent. )

[0078] b. Homogenization: add the weighed conductive agent and positive electrode glue to the homogenizer, add the positive electrode solvent according to the designed solid content, and stir until complete...

Embodiment 1

[0131] 1. Preparation of positive electrode sheet

[0132] (1) Weighing: Weigh the positive active material (Li(Ni) 0.95 Co 0.03 Mn 0.02 )O 2 ) 9g, conductive graphite 0.5g, positive electrode glue 6.25g (composed of positive electrode solvent (NMP) and positive electrode binder (PVDF), of which PVDF mass fraction is 8%). Among them, the positive electrode active material is the positive electrode material, and the SEM image of the positive electrode material is as follows image 3 shown.

[0133] (2) Homogenization: add the weighed positive glue and conductive graphite to the homogenizer, add NMP according to the designed solid content of 50%, and stir until completely dissolved; then add the weighed Li (Ni) 0.95 Co 0.03 Mn 0.02 )O 2 , stir evenly, and complete the homogenization process.

[0134](3) Coating: The homogenized positive electrode slurry is evenly coated on the aluminum foil with a coating machine, and the coating thickness is 120 μm. After the coating i...

Embodiment 2

[0147] 1. Preparation of positive electrode sheet

[0148] (1) Weighing: Weigh the positive active material (Li(Ni) 0.65 Co 0.07 Mn 0.28 )O 2 ) 9.5g, conductive graphite 0.2g, positive electrode glue 3g (composed of positive electrode solvent (NMP) and positive electrode binder (PVDF), of which PVDF mass fraction is 10%). Among them, the positive electrode active material is the positive electrode material, and the SEM image of the positive electrode material is as follows Figure 5 shown.

[0149] (2) Homogenization: add the weighed positive glue and conductive graphite to the homogenizer, add NMP according to the designed solid content of 50%, and stir until completely dissolved; then add the weighed Li (Ni) 0.65 Co 0.07 Mn 0.28 )O 2 , stir evenly, and complete the homogenization process.

[0150] (3) Coating: The homogenized positive electrode slurry is evenly coated on the aluminum foil with a coating machine, and the coating thickness is 130 μm. After the coating...

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Abstract

The invention provides a method and a device for testing the DC internal resistance of a battery, electronic equipment and a storage medium. The method comprises the following steps: measuring the discharge capacity of the battery; determining at least one test point within the range of the discharge capacity; wherein the test points are used for dividing the discharge capacity, and each test point corresponds to one discharged discharge capacity; before each test point, carrying out constant current discharge on the battery until the discharged discharge capacity reaches the test point; acquiring a first voltage and a first current when constant current discharge is cut off; for each test point, pulse current discharge is performed on the battery; acquiring a second voltage and a second current when the discharge of the pulse current is cut off; and calculating the DC internal resistance of the battery based on the first voltage, the first current, the second voltage and the second current. According to the method provided by the invention, the discharge capacity is directly taken as a division basis, so that the set capacity test point and the actual capacity test point basically coincide, the deviation is small, and the measured direct-current internal resistance is more accurate.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a method, device, electronic device and storage medium for testing the DC internal resistance of a battery. Background technique [0002] The size of the DC internal resistance (DCIR) not only affects the power performance and discharge efficiency of the battery; but also due to the increase in the number of battery cycles and storage time, the DC internal resistance will continue to increase, and DC is also used in practical applications. The internal resistance is used to evaluate the health of the battery and estimate the life of the battery. Therefore, the test of DC internal resistance has always attracted much attention. [0003] At present, a method for testing the DC internal resistance is the discharge time method, which includes: dividing the time when the battery is fully discharged into 10 equal parts to obtain the actual test point, which is equivalent to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R31/378
CPCG01R31/389G01R31/378Y02E60/10
Inventor 阎晓静郑佳玲訚硕
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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