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Method for detecting design reasonability of N/P ratio of lithium ion three-electrode battery

A lithium-ion battery, three-electrode technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of battery danger, waste of battery synthesis and feeding, battery lithium analysis, etc., and achieve the effect of simple operation and good application prospects

Active Publication Date: 2019-07-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] A three-electrode method for detecting the rationality of the design of the N / P ratio of lithium-ion batteries proposed by the present invention can solve the waste of battery synthesis and feeding that may be caused by the unreasonable design of the battery N / P or the analysis of the battery during the battery charging process. Lithium, which can eventually cause dangerous technical problems with batteries

Method used

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  • Method for detecting design reasonability of N/P ratio of lithium ion three-electrode battery
  • Method for detecting design reasonability of N/P ratio of lithium ion three-electrode battery
  • Method for detecting design reasonability of N/P ratio of lithium ion three-electrode battery

Examples

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Effect test

example 1

[0028] When N / P = 1.1, the judgment of the design rationality of the N / P ratio of the three-electrode battery:

[0029] (1) Put the three-electrode battery with N / P = 1.1, lithium foil as the reference and graphite as the negative electrode in a thermostat at 25°C, connect to the test cabinet, and charge to full charge at 0.05c.

[0030] (2) Analyze the change trend of the potential of the negative electrode to the reference during the charging process;

[0031] (3) by figure 2 It can be seen from the middle curve that during the process of charging to 4.2V, three complete lithium-intercalation platforms appear on the curve of the negative electrode to the reference potential of the battery. This phenomenon indicates that the positive electrode of the battery is charged from 0.05c to 4.2V. The extracted reversible lithium happens to be embedded in the negative electrode graphite, so it is judged that the N / P ratio of the battery is designed to be reasonable.

example 2

[0033] When N / P = 1.3, the judgment of the design rationality of the N / P ratio of the three-electrode battery:

[0034] (1) A three-electrode battery with N / P = 1.3, lithium foil as the reference and graphite as the negative electrode is placed in a thermostat at 25°C, connected to the test cabinet, and charged to full charge at 0.05c.

[0035] (2) Analyze the change trend of the potential of the negative electrode to the reference during the charging process;

[0036] (3) by image 3 It can be seen from the middle curve that during the process of charging to 4.2V, the third lithium-intercalation platform on the curve of the negative electrode to the reference potential of the battery did not fully appear. This phenomenon indicates that the battery is charged from 0.05c to 4.2V. The active lithium extracted from the positive electrode cannot be embedded in the graphite of the negative electrode. Therefore, it is judged that the N / P ratio of the battery is too large and unreasonable. ...

example 3

[0038] When N / P = 0.8, the judgment of the design rationality of the N / P ratio of the three-electrode battery:

[0039] (1) Put a three-electrode battery with N / P = 0.8, lithium foil as a reference, and graphite as the negative electrode in a thermostat at 25°C, connect to the test cabinet, and charge to full charge at 0.05c.

[0040] (2) Analyze the change trend of the potential of the negative electrode to the reference during the charging process;

[0041] (3) by Figure 4 It can be seen from the middle curve that in the process of charging to 4.2V, in addition to three complete lithium insertion platforms appearing on the curve of the battery’s negative electrode versus reference potential, there is also a fourth lithium evolution platform around 0V. This phenomenon indicates When the battery is charged from 0.05c to 4.2V, the amount of active lithium released from the positive electrode is greater than the amount of lithium that can be accommodated when the surface of the negat...

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Abstract

The invention discloses a method for detecting design reasonability of an N / P ratio of a lithium ion three-electrode battery, and solves the technical problem that the waste of battery synthesis feeding or lithium evolution of the battery in a battery charging process is caused by unreasonable N / P design of the battery, and the battery is dangerous finally. The method comprises the following stepsof S100, placing the lithium ion three-electrode battery in a thermostat with the temperature of 25 DEG C, and connecting to a test cabinet, and charging to a full electric state at a set rate; and S200, judging the reasonability of the N / P design of the battery according to the variation tendency of the potential of the negative electrode pair reference in the charging process. According to themethod, through the changes of a negative electrode potential platform of the three-electrode battery at the different N / P ratios in the charging process, the reasonability of the N / P design of the battery is clearly judged, and the method is simple and feasible to operate, and has a good application prospect in the aspect of battery design.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for detecting the rationality of the design of the N / P ratio of a lithium ion battery with three electrodes. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long life, green and low carbon, and are widely used in electric vehicles and consumer electronics. However, unreasonable lithium-ion battery design will easily cause thermal runaway inside the battery, leading to unsafe accidents such as battery fire and explosion. In battery design, an important criterion is the size of the battery’s N / P ratio. When the N / P ratio is designed to be too large, during the charging process, the amount of lithium inserted on the surface of the negative electrode is insufficient, and the capacity cannot be fully utilized. When the time is too small, the reversible lithium content in the positive electrode is excessive, which is g...

Claims

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Application Information

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IPC IPC(8): G01R31/385
CPCG01R31/385
Inventor 吴欢欢袁雪芹李丽娟王蓉蓉邵素霞冷飞喜陈方
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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