Relaxation voltage characteristic-based battery internal short circuit diagnosis method

A technology for short-circuit diagnosis and voltage characteristics, which is used in short-circuit testing, battery load switching, and electrical measurement. It can solve problems such as low accuracy, long detection time, and vulnerability to external interference. The effect of improving estimation accuracy and shortening detection time

Active Publication Date: 2020-08-18
TONGJI UNIV
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Problems solved by technology

[0003] In the prior art, a threshold-based method is generally used to detect whether an internal short circuit occurs, that is, to determine whether an internal short circuit occurs by detecting whether the voltage change difference, current change difference, and temperature change difference exceed a set threshold, but now Some internal short circuit detection methods take a long time to detect, are susceptible to external interference, and the detection results are affected by the threshold setting, the detection accuracy is not high, and the diagnostic effect is not good

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  • Relaxation voltage characteristic-based battery internal short circuit diagnosis method
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  • Relaxation voltage characteristic-based battery internal short circuit diagnosis method

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[0039] A method for diagnosing a short circuit in a battery based on relaxation voltage characteristics of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The features in the examples can be combined with each other.

[0040] The definitions of terms mentioned in the embodiments of the present invention are as follows:

[0041] Internal short circuit: An abnormal path that is directly conducted between the positive and negative electrodes inside the battery or indirectly conducted by other foreign objects.

[0042] Relaxation voltage: Relaxation voltage is the voltage change that reaches a stable open circuit state at the moment of current unloading. It is an external manifestation of the internal balance process of the battery. The relaxation voltage is a measure of the "recovery ability" of the battery after unloading the current. The essence of the description is to take the recovery ability of t...

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Abstract

The invention relates to a relaxation voltage characteristic-based battery internal short circuit diagnosis method, which comprises the following steps of: 1) obtaining a relaxation voltage curve of each battery monomer in a battery after unloading current under the same battery condition; (2) carrying out feature extraction on the relaxation voltage curve of each single battery to obtain corresponding curve features, and (3) judging whether the single batteries have internal short circuits or not according to the curve features to complete diagnosis. Compared with the prior art, the method has the advantages of short detection time, high accuracy and the like.

Description

technical field [0001] The invention relates to the field of battery fault diagnosis, in particular to a method for diagnosing a short circuit in a battery based on relaxation voltage characteristics. Background technique [0002] Lithium-ion batteries are widely used in vehicles, electronic products, and energy storage power stations due to their advantages such as high specific energy density and long cycle life. However, safety accidents of lithium-ion batteries occur from time to time. There are many internal short circuits in lithium-ion batteries, including manufacturing defects, mechanical abuse, electrical abuse, and thermal abuse. Internal short circuits may occur at any time during the entire life cycle of the battery. Internal short circuits can easily cause thermal runaway and cause serious safety accidents. Therefore, , The internal short circuit needs to be diagnosed in time and give an early warning, so as to ensure the safety of life and property. [0003] I...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3835G01R31/367G01R31/389G01R31/396
CPCG01R31/3835G01R31/367G01R31/389G01R31/396G01R31/52H02J7/0068
Inventor 戴海峰魏学哲王学远张广续
Owner TONGJI UNIV
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