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Method for estimating health state of lithium battery

A state of health, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficulty, low reliability of numerical accuracy, and long time consumption, etc., achieve low cost, improve estimation accuracy, The effect of simple estimation methods

Active Publication Date: 2013-06-19
GREAT WALL MOTOR CO LTD
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  • Abstract
  • Description
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Problems solved by technology

Using the Eileen equation to determine the capacity decay rate through the relationship between activation enthalpy, activation entropy and temperature, but at present, this method is difficult and time-consuming. At the same time, there is a big difference between theoretical calculation and actual operating environment. Numerical accuracy is not reliable

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  • Method for estimating health state of lithium battery
  • Method for estimating health state of lithium battery
  • Method for estimating health state of lithium battery

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0031] Such as figure 1 As shown, a method for evaluating the state of health of a lithium battery provided in an embodiment of the present invention includes:

[0032] Step S10, obtaining the capacity decay rate of the battery pack during use;

[0033] Step S11, obtaining the capacity difference change rate of the capacity difference between the constant current charging section and the constant voltage charging section during the use of the battery pack;

[003...

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Abstract

The embodiment of the invention discloses a method for estimating the health state of a lithium battery, and relates to the technical field of batteries. In order to fulfill the aims of high accuracy of data estimation, simple estimation method and low cost, the invention provides the method. The method comprises the following steps of: acquiring the capacity fading rate of a battery pack in the using process; acquiring the capacity difference change rate of difference between capacity at a constant-current charge section and capacity at a constant-voltage charge section of the battery pack in the using process; and selecting a minimum value in the capacity fading rate and the capacity difference change rate, and judging the health state of the battery by the minimum value, wherein the capacity fading rate is close to the capacity difference change rate. The method is mainly applied to the judgment of the health state of the battery.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a method for evaluating the state of health of a lithium battery. Background technique [0002] At present, the SOH (State of Health) of most lithium batteries is judged by the aging state of the battery. The main parameters that characterize battery aging include the attenuation of battery capacity and the increase of battery internal resistance. [0003] Battery capacity attenuation refers to the encapsulation effect of reaction substances caused by side reactions and the generation of passivation film inside the battery, and the consumption of lithium ions by the thickening of the SEI film, etc., so that the total amount of reversible lithium ions inside the battery during the service life Decrease continuously, and finally reach the lower limit of the capacity, and reach the end of life state (for example, when the battery capacity can drop to 80%, that is, when SOH...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 杨帆黄勇朱永利魏向辉
Owner GREAT WALL MOTOR CO LTD
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