Lithium ion battery fault early warning method and system based on vibration signals

A lithium-ion battery, vibration signal technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of lithium-ion battery temperature rise, battery thermal abuse, battery mechanical abuse, etc., to achieve convenient equipment connection, The effect of improving accuracy problems and improving sensitivity

Inactive Publication Date: 2020-06-16
HOHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Aiming at the abuse of energy storage batteries, it mainly includes battery mechanical abuse caused by damage to the battery case due to external force, overcharge, overdischarge, battery electrical abuse caused by external short circuit, and external factors Impact, battery side reaction heat generation causes battery heat abuse caused by local overheating of the battery, the above abuse will cause the temperature of the lithium-ion battery to rise sharply in a short period of time, and further develop into thermal runaway

Method used

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  • Lithium ion battery fault early warning method and system based on vibration signals
  • Lithium ion battery fault early warning method and system based on vibration signals
  • Lithium ion battery fault early warning method and system based on vibration signals

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Embodiment 1

[0041] Based on the above analysis, the present invention provides a lithium-ion battery fault early warning method based on vibration signals, such as Figure 10 As shown, the vibration signal of the lithium-ion battery in the running state is collected; the collected vibration signal is Fourier transformed to obtain the frequency spectrum of the vibration signal; the main frequency of the vibration signal is obtained from the frequency spectrum of the vibration signal, according to the vibration The change of the main frequency of the signal starts the early warning; specifically: compare the main frequency of the vibration signal with the frequency setting value, when the main frequency of the vibration signal exceeds the frequency setting value, start the early warning; the main frequency of the battery in normal operation is mainly Focus on the low frequency band of 0Hz to 150Hz. The specific frequency value needs to be measured and reviewed according to the specific condi...

Embodiment 2

[0043] The present invention also provides a lithium-ion battery failure early warning system based on vibration signals, including a vibration acceleration sensor, which collects the vibration signal of the lithium-ion battery, and transmits the vibration signal to a dynamic signal test analyzer, a dynamic signal test analyzer The time domain data of the vibration signal is transmitted to the host computer, and the host computer extracts the main frequency of the vibration signal from the time domain data of the vibration signal and compares it with the frequency setting value. When the main frequency of the vibration signal exceeds the frequency setting value, Start the early warning; the host computer extracts the frequency band where the energy peak of the vibration signal is located from the time domain data of the vibration signal, and when the frequency band where the energy peak of the vibration signal exceeds the set value of the frequency band, the early warning is act...

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Abstract

The invention discloses a lithium ion battery fault early warning method and a lithium ion battery fault early warning system based on a vibration signal in the technical field of battery fault monitoring and early warning, which can timely perform online early warning on two abnormal working conditions of overcharge and external short circuit of a lithium ion battery, and have relatively high early warning accuracy rate. The lithium ion battery fault early warning method comprises the following steps of: acquiring a vibration signal of the lithium ion battery in an operating state; performingFourier transform on the acquired vibration signal to obtain a spectrogram of the vibration signal; acquiring the main frequency of the vibration signal from the spectrogram of the vibration signal,and starting early warning according to the change of the main frequency of the vibration signals; carrying out continuous wavelet transform on the acquired vibration signal to obtain a time-frequencydiagram of the vibration signal; acquiring a frequency band where the highest energy peak of the vibration signal is located from the time-frequency diagram of the vibration signal; and starting early warning according to the change of the frequency band where the highest energy peak of the vibration signal is located.

Description

technical field [0001] The invention belongs to the technical field of battery fault monitoring and early warning, and in particular relates to a lithium ion battery fault early warning method and system based on vibration signals. Background technique [0002] The use of large-scale energy storage power stations can help alleviate the fluctuations when renewable energy is connected to the grid, improve the stability and controllability of new energy power stations; at the same time, it can store and supply energy to alleviate the power supply load demand during peak hours. Lithium-ion batteries are a type of batteries that use lithium metal or lithium alloy as the negative electrode material. Compared with other batteries, lithium-ion batteries have the advantages of large specific energy, high specific power, long cycle life, no memory effect, and low self-discharge rate. , is the basic component of the energy storage power station. [0003] Aiming at the abuse of energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01R31/367G01R31/387
CPCG01H17/00G01R31/367G01R31/387
Inventor 彭晓晗马宏忠钱昆臧旭吴金利吴元熙许洪华李晨
Owner HOHAI UNIV
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