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

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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] An electrical core method for three electrode testing, according to the battery cell for the three-electrode test, the specific steps are as follows:

[0042] S1, the basic core: according to the steps, coating, rolling, slit, extreme ear setting, and the steps of the core assembly of the core;

[0043] S2, the third electrode unit is prepared: the third electrode unit is produced according to the step of proportioning, coating, roller press, slit, extreme ear, and the lamination, wherein the single layer positive electrode and single layer negative electrode are single-sided coating. Structure, the back surface of the two is not coated;

[0044] S3, assembled housing: in order of the base core, the isolation film, the third electrode unit in sequentially placed in a rolled shape aluminum-plastic packaging film, adjust the basic core positive ear, the negative ear and the third electrode unit first ears, The second polar ear position avoids direct contact, and then the alum...

Example Embodiment

[0053] DETAILED DESCRIPTION OF THE INVENTION 1 is as follows:

[0054] Preparation of the basic core, the positive electrode sheet formulation is a positive electrode active material (lithium cobaltate): a conductive agent (carbon black): binder (polyvinylidene fluoride) = 97: 1.5: 1.5, negative electrode sheet formulation is an negative electrode active material (middle Phase carbon microspheres): Conductants (graphite): CMC (sodium carboxymethylcellulose, thickener): SBR (butadiene rubber, binder) = 95: 1: 2: 2.

[0055] First, the positive and negative slurry was prepared by stirring mixing by stirring mixing, wherein the positive electrode is an oil-based system. When mixing is mixed, the slurry is carried by a dual planetary stirring apparatus in the case of controlling temperature and vacuum, and the slurry is transferred to the coating head after testing the viscosity, the solid content and fineness satisfying the application.

[0056] The concentrate of the positive electr...

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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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