Method for estimating SOH of power lithium ion battery based on alternating current impedance test

A lithium-ion battery and AC impedance technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of no feasibility, unusable batteries, etc., and achieve the effect of maintaining integrity and accurate estimation

Active Publication Date: 2014-06-18
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

This method is not feasible in the power lithium-ion battery used in actual electric vehicles, and the method of disassembling the battery makes the battery unusable

Method used

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  • Method for estimating SOH of power lithium ion battery based on alternating current impedance test
  • Method for estimating SOH of power lithium ion battery based on alternating current impedance test
  • Method for estimating SOH of power lithium ion battery based on alternating current impedance test

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0027] Such as figure 1 , a method for estimating the SOH of a power lithium-ion battery based on an AC impedance test, comprising steps in the following order:

[0028] S1. Charge the battery with a constant current of 1 to 0.5C, discharge the battery with a constant current of 0.1 to 0.05C, and record the amount of electricity released during each cycle of discharge;

[0029] S2. Perform an AC impedance test on the battery when the battery is discharged to 0 charge state, and take the charge transfer impedance of the battery fitted by the AC impedance curve of the intermediate frequency 0.25Hz-1.2KHz in NOVA1.1;

[0030] S3. According to the discharge power per circle, charge transfer impedance, and number of turns as the input parameters of the estimation function, t...

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Abstract

The invention discloses a method for estimating the SOH of a power lithium ion battery based on an alternating current impedance test. The method comprises the following steps that the battery is charged at the constant current of 1 C to 0.5 C, the battery is discharged at the constant current of 1 C to 0.5 C, and the quantity of electricity discharged in the discharging process of each ring is recorded; the alternating current impedance test is conducted on the battery when the battery is discharged to the zero charge state and the charge transmission impedance of the battery is obtained from the NOV1.1 in a fitting mode through an alternating current curve of the medium frequency ranging from 0.25 Hz to 1.2 KHz; the discharging quantity of each ring, the charge transmission impedance and the number of rings serve as input parameters of an estimation function, and a capacity fading curve and a charge transmission impedance curve are obtained from the Origin 9 in a fitting mode; the capacity fading curve is corrected according to the charge transmission impedance curve, the estimation function of the battery SOH changing along with the number of the circulation rings is established, and judgment data for the SOH of a battery of the same type are calculated. According to the method, the SOH is estimated through the addition of the charge transmission impedance, an estimation result is more accurate, and the battery does not need to be detached.

Description

technical field [0001] The invention relates to the field of estimating the state of health of a lithium-ion battery, in particular to a method for estimating the SOH of a power lithium-ion battery based on an AC impedance test. Background technique [0002] With the rapid development of electric vehicles (EDVs), including battery electric vehicles (BEV), hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV), battery technology has received worldwide attention and attention. Therefore, based on the existing battery technology, an important research area is to improve the efficiency and lifetime of batteries in electric vehicles. At present, the power lithium-ion battery is the optimal solution for pure electric vehicles, but it still has the potential risk of safety accidents caused by overcharging and over-discharging. Accurately estimating the state of health (SOH) of the battery is a key technology to ensure the safe operation of electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 李伟善张远明胡佳娜蔡燕凤邱显焕熊恋文陈彦霖王英博郭均盛
Owner SOUTH CHINA NORMAL UNIVERSITY
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