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Method for rapidly measuring impedance of storage battery during charging

A measurement method and storage battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of impedance uncertainty, lack of signal time domain information, etc., and achieve rich harmonic components, short calculation time, and accurate Effects of Impedance Measurements

Inactive Publication Date: 2019-12-10
TONGJI UNIV
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Problems solved by technology

The above method of obtaining battery impedance based on Fourier transform and Laplace transform, although the battery impedance has been obtained to a certain extent, but because the battery impedance has a certain timeliness, the battery impedance at different times is different, and Fu Fourier transform including fast Fourier transform lacks time domain information of the signal, this characteristic makes the impedance obtained by this method uncertain

Method used

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  • Method for rapidly measuring impedance of storage battery during charging
  • Method for rapidly measuring impedance of storage battery during charging
  • Method for rapidly measuring impedance of storage battery during charging

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Embodiment

[0045] The present invention takes the impedance of the battery as the target, and the impedance is a complex-valued object including amplitude and phase angle. Therefore, the complex-valued wavelet should be selected in the wavelet type, which can express phase information well. In addition, the research of battery impedance will involve signal feature extraction on the one hand, and signal positioning in the frequency domain on the other hand, so non-orthogonal wavelets need to be selected as the wavelet basis functions. Morlet wavelet is an exponential complex wavelet adjusted by Gaussian function. Its imaginary part is the Hilbert transform of the real part, which meets the requirements of complex wavelet and non-orthogonal wavelet. In addition, the Morlet wavelet base can achieve time or frequency resolution matching the signal, and can provide an explicit relationship between scale and frequency, which is very suitable for impedance calculation. In addition, the Morlet wa...

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Abstract

The invention relates to a method for quickly measuring the impedance of a storage battery during charging. The method comprises the following steps: 1) connecting the storage battery to be measured with a charging device; 2) charging and discharging the storage battery to be measured by using a charging device to generate a current step signal, thus generating changed current and voltage; 3) collecting voltage and current signals on the storage battery during charging and discharging of the storage battery; and 4) carrying out wavelet analysis on the sampled and collected voltage and currentof the storage battery, and acquiring the impedance value of the storage battery through the ratio of the wavelet transform coefficients of the voltage and the current. Compared with the prior art, the method has the advantages of no need of external sine excitation, short measurement time, rapidness, accuracy and the like.

Description

Technical field [0001] The invention relates to the field of electronic information and battery measurement, in particular to a method for quickly measuring battery impedance during charging. Background technique [0002] Lithium-ion batteries are widely used in vehicles and consumer electronics due to their high specific energy, environmental protection, and no memory effect. However, the battery is not a perfect energy storage system, and the complicated use environment of the battery during operation may cause problems such as aging, thermal runaway, and deterioration of inconsistency. Therefore, it is very important to effectively evaluate the performance and status of lithium-ion batteries, and to perform battery management based on this. As an important parameter describing the internal process of the battery, the battery impedance is an important characterizing parameter of the battery state. It is widely used in the state of health (SOH, State of Health), internal temper...

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Application Information

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IPC IPC(8): G01R31/389G01R31/387
CPCG01R31/387G01R31/389
Inventor 王学远魏学哲陈启军戴海峰
Owner TONGJI UNIV
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