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A simple soft-pack four-electrode lithium-ion battery test system

A lithium-ion battery and four-electrode technology, which is applied in the field of simple soft-pack four-electrode lithium-ion battery test system, can solve the problems of blocking lithium ion migration channels, low success rate, harsh environmental requirements, etc., to increase statistical significance , Potential control is precise, and the effect of increasing reliability

Active Publication Date: 2019-12-20
吴位跃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in the "simulated full battery", the reference battery is usually placed between the positive and negative electrodes, which has the disadvantage that the reference battery will block the migration channel of some lithium ions and increase the difficulty of assembling the battery. Affects the success rate and reproducibility of the three-electrode system fabrication
[0006] In summary, the existing three-electrode battery system still has defects such as harsh environmental requirements, difficult operation, and low success rate. The bigger defect is that it cannot truly reflect the electrochemical performance of the positive and negative electrodes in the finished battery.

Method used

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  • A simple soft-pack four-electrode lithium-ion battery test system
  • A simple soft-pack four-electrode lithium-ion battery test system
  • A simple soft-pack four-electrode lithium-ion battery test system

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Embodiment 1

[0026] Both the annular positive electrode sheet 4 and the square positive electrode sheet 3 are made of lithium iron phosphate material, the annular negative electrode sheet 1 and the square negative electrode sheet 2 are both made of graphite material, and the formulas of the annular positive electrode sheet 4 and the square positive electrode sheet 3 include active materials, conductive agents and bonding agents. agent, the formula of ring-shaped positive electrode sheet 4 and square positive electrode sheet 3 includes active material, conductive agent and binding agent, the proportion of active material is 80% ~ 98%, the proportion of conductive agent is 1% ~ 10%, the proportion of binding agent The ratio is 1%~10%, and the coating surface density of the pole piece is 15mg / cm 2 ~40mg / cm 2 , the formulation of ring-shaped negative electrode sheet 1 and square negative electrode sheet 2 contains active material, conductive agent and binding agent, the formulation of ring-sha...

Embodiment 2

[0032]The annular positive electrode sheet 4 is made of lithium iron phosphate material, and the annular negative electrode sheet 1 is made of graphite material. The formulation of the ring-shaped positive electrode sheet 4 includes an active material, a conductive agent, and a binder. The formulations of the ring-shaped positive electrode sheet 4 and the square positive electrode sheet 3 include an active material, a conductive agent, and a binder, and the proportion of the active material is 80% to 98%. , the proportion of conductive agent is 1%~10%, the proportion of binder is 1%~10%, and the coating surface density of pole piece is 15mg / cm 2 ~40mg / cm 2 . The formula of annular negative electrode sheet 1 includes active material, conductive agent, and binding agent, the formula of annular positive electrode sheet 4 and square positive electrode sheet 3 includes active material, conductive agent and binding agent, and the proportion of active material is 80% ~ 98% , the pr...

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Abstract

The invention belongs to the field of detection technologies for electrochemical performance of secondary batteries, and particularly relates to a simple flexibly packaged four-electrode lithium ion battery test system. Known lithium battery materials can be used as reference electrodes, and even to-be-tested pole pieces can be used as reference for carrying out specific electrochemical experiments without extra control means or working procedures. The simple flexibly packaged four-electrode lithium ion battery test system comprises an annular negative pole piece, a square negative pole piece,a square positive pole piece, an annular positive pole piece and diaphragms. The simple flexibly packaged four-electrode lithium ion battery test system has the advantages that existing mature flexibly packaged battery lamination and packaging processes are adopted, the simple flexibly packaged four-electrode lithium ion battery test system is simple and convenient, the sizes and the shapes of the pole pieces can be voluntarily customized, and additional complicated processing equipment can be omitted; materials for the reference electrodes can be extensively selected without being limited tometal lithium, environmental control requirements on the reference electrodes are not as strict as environmental control requirements on the metal lithium, and environmental control only needs to keep consistent with environmental control on working electrodes; batteries can be repeatedly manufactured on a large scale, and the statistical significance of tests and the credibility of data can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical performance detection of secondary batteries, and in particular relates to a simple soft-pack four-electrode lithium-ion battery testing system. Background technique [0002] In order to study the performance of the positive and negative electrodes in the battery, especially the kinetic characteristics of the battery, the third electrode is often introduced into the battery system as a reference electrode. Since the reference electrode does not participate in the electrochemical reaction, does not undergo polarization, and has a stable potential, it can be used to monitor or control the relative potential difference between the working electrode and the reference electrode to do a large number of electrochemical tests. It's a great help. [0003] The existing method of making a three-electrode detection system is often carried out by metal lithium assisting "simulating a full battery". L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42
CPCH01M10/4285Y02E60/10
Inventor 曾怡陈坤朱阳阳
Owner 吴位跃