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Battery cell for three-electrode test and test method thereof

A three-electrode, cell technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as potential instability, errors, and unsuitability for long-term continuous work, achieving the effect of good lithium analysis process and good data support

Pending Publication Date: 2021-06-04
湖南美尼科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After the existing third electrode is used for a period of time, unpredictable errors will occur with the consumption of lithium on the surface, and it is impossible to detect the consumption of lithium by effective means before the test. The potential is unstable and it is not suitable for long-term continuous work.

Method used

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  • Battery cell for three-electrode test and test method thereof
  • Battery cell for three-electrode test and test method thereof
  • Battery cell for three-electrode test and test method thereof

Examples

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preparation example Construction

[0041] A method for preparing a cell for three-electrode testing, according to the cell for three-electrode testing, the specific steps are as follows:

[0042] S1. Preparation of basic roll core: make the basic roll core according to the steps of pulp mixing, coating, rolling, slitting, tab setting, and roll core assembly;

[0043] S2. Preparation of the third electrode unit: The third electrode unit is produced according to the steps of pulp mixing, coating, rolling, slitting, tab setting, and lamination, in which the single-layer positive electrode and the single-layer negative electrode are both coated on one side Structure, both back uncoated surface adhesive paper;

[0044] S3. Assemble into the case: put the basic core, separator, and third electrode unit into the punched aluminum-plastic packaging film in sequence, and adjust the positive and negative tabs of the basic core and the first tab and the third electrode unit of the third electrode unit. The direction of th...

specific Embodiment 1

[0054] Prepare the basic winding core, the formula of the positive electrode sheet is positive electrode active material (lithium cobaltate): conductive agent (carbon black): binding agent (polyvinylidene fluoride)=97:1.5:1.5, the formula of negative electrode sheet is negative electrode active material (middle phase carbon microspheres): conductive agent (graphite): CMC (sodium carboxymethylcellulose, thickener): SBR (styrene-butadiene rubber, binder) = 95:1:2:2.

[0055] Firstly, the positive and negative electrode slurries were prepared by stirring and mixing according to the above proportions, wherein the positive electrode used an oily system, and the negative electrode used a water-based system. When stirring and mixing, the double planetary stirring equipment is used to prepare the slurry under the condition of controlling the temperature and the degree of vacuum. After testing the viscosity, solid content and fineness of the slurry to meet the requirements, the slurry i...

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Abstract

The invention discloses a battery cell for a three-electrode test. A basic roll core and a third electrode unit are packaged together through an aluminum-plastic packaging film, after the third electrode unit is activated, a reference tab led out of the third electrode unit has an obvious potential platform, and the reference tab led out of the third electrode unit can be used as a reference electrode. According to the battery cell for the three-electrode test, one tab of the third electrode unit with the single-layer structure is used as a third electrode, and the third electrode can keep the potential stable in the test process. According to the battery cell disclosed by the invention, the electrodes of the positive and negative active materials with good charge and discharge potential platforms are used as the reference electrodes in a three-electrode test system so that the battery cell can bear a certain current in a proper charge state, and the stability of the potential is maintained in a continuous test; and the potential change condition of the positive electrode and the negative electrode in the basic roll core can be well monitored in real time for a long time when the current passes through.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a battery cell used for three-electrode testing and a testing method thereof. Background technique [0002] Lithium-ion batteries have been widely used in digital, energy storage, new energy vehicles and other fields due to their advantages in energy density, power density, cycle life and safety since they were launched by SONY Corporation of Japan in 1990, and the market scale has expanded rapidly. , has become the most widely used battery system. [0003] A conventional lithium battery consists of a positive electrode and a negative electrode, and the battery voltage is the difference between the potential of the positive electrode and the potential of the negative electrode. When testing the voltage change of the lithium battery under the condition of passing current, what is obtained is the potential difference between the positive electrode and the negative electrode wh...

Claims

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Application Information

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IPC IPC(8): H01M10/48H01M10/0587H01M10/0525G01N27/403
CPCG01N27/403H01M10/0525H01M10/0587H01M10/48Y02E60/10Y02P70/50
Inventor 卢灿生陈邦义
Owner 湖南美尼科技有限公司
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