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A LIB LIFE ESTIMATION METHOD BASED ON RELAXATION TIME DISTRIBUTION

A lithium-ion battery, relaxation time technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as lack of estimation methods, and achieve the effect of improving estimation speed and estimation accuracy

Active Publication Date: 2021-11-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the estimation method of battery life in the current engineering field is very lacking, and it is urgent to find an accurate and feasible new method

Method used

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  • A LIB LIFE ESTIMATION METHOD BASED ON RELAXATION TIME DISTRIBUTION
  • A LIB LIFE ESTIMATION METHOD BASED ON RELAXATION TIME DISTRIBUTION
  • A LIB LIFE ESTIMATION METHOD BASED ON RELAXATION TIME DISTRIBUTION

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Embodiment 1

[0074] Such as figure 1 As shown, the present embodiment provides a method for estimating the life of a lithium-ion battery based on the relaxation time distribution, the method comprising the following steps:

[0075] S1. Select a large number of lithium-ion battery samples without aging, and test the AC impedance spectrum and capacity value of the battery at different aging stages;

[0076] S2, calculating the relaxation time distribution function of the AC impedance;

[0077] S3, establishing the relationship between the relaxation time distribution function and the lifetime;

[0078] S4. According to the relationship between the relaxation time distribution and the lifetime at a specific frequency, estimate the lifetime of other batteries whose lifetime is unknown.

[0079] Step S1 conducts AC impedance spectroscopy and capacity value tests multiple times at different SOCs and temperatures T at different aging stages, and then obtains AC impedance spectroscopy at a set S...

Embodiment 2

[0108] The present embodiment provides a method for estimating the lifetime of a lithium-ion battery based on the relaxation time distribution, the method comprising the following steps:

[0109] S1. Select a large number of lithium-ion battery samples without aging, and test the AC impedance spectrum and capacity value of the battery at different aging stages;

[0110] S2, calculating the relaxation time distribution function of the AC impedance;

[0111] S3, establishing the relationship between the relaxation time distribution function and the lifetime;

[0112] S4. According to the relationship between the relaxation time distribution and the lifetime at a specific frequency, estimate the lifetime of other batteries whose lifetime is unknown.

[0113] Step S1 conducts AC impedance spectroscopy and capacity value tests multiple times at different SOCs and temperatures T at different aging stages, and then obtains AC impedance spectroscopy at a set SOC and a set temperature...

Embodiment 3

[0131] The present embodiment provides a method for estimating the lifetime of a lithium-ion battery based on the relaxation time distribution, the method comprising the following steps:

[0132] S1. Select a large number of lithium-ion battery samples without aging, and test the AC impedance spectrum and capacity value of the battery at different aging stages;

[0133] S2, calculating the relaxation time distribution function of the AC impedance;

[0134] S3, establishing the relationship between the relaxation time distribution function and the lifetime;

[0135] S4. According to the relationship between the relaxation time distribution and the lifetime at a specific frequency, estimate the lifetime of other batteries whose lifetime is unknown.

[0136] Step S1 conducts multiple AC impedance spectra and capacity value tests at different SOCs and temperatures T at different aging stages, and then obtains AC impedance spectra at set SOC and set temperature at different aging st...

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Abstract

The invention relates to a method for estimating the life of a lithium-ion battery based on relaxation time distribution. The method includes the following steps: S1. Select a large number of lithium-ion battery samples that have not been aged, and test the AC impedance spectrum and the AC impedance spectrum of the battery at different aging stages Capacity value; S2. Calculate the relaxation time distribution function of AC impedance; S3. Establish the relationship between the relaxation time distribution function and the life; S4. According to the relationship between the relaxation time distribution and the life at a specific frequency, other batteries with unknown life life expectancy. Compared with the prior art, the invention considers the aging mechanism of the lithium ion battery, and can improve the life estimation accuracy of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of energy storage batteries, in particular to a method for estimating the life of a lithium-ion battery based on relaxation time distribution. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic products, electric vehicles, and static energy storage systems due to their advantages such as high energy density and power density, long life, and no memory effect. However, as lithium-ion batteries are stored or recycled, the battery life will gradually shorten. The shortening of lithium-ion battery life is mainly manifested in the attenuation of capacity and power, which will make lithium-ion batteries unable to meet the working needs of electric vehicles and other equipment. For example, the attenuation of capacity will shorten the mileage of electric vehicles, and the attenuation of power will reduce the acceleration and climbing performance of electric vehicles, making electric vehi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/392G01R31/385
CPCG01R31/367G01R31/385G01R31/392
Inventor 魏学哲乔冬冬戴海峰王学远
Owner TONGJI UNIV
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