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Research on Measurement Methods of Electrochemical Impedance Spectroscopy of Lithium-Ion Battery

Author: HanXiaoLi
Tutor: WangLiXin
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Electrochemical measurements Electrochemical impedance spectroscopy Sweep All Phase FFT Laplace transform
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 177
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Abstract


Electronic products toward the direction of the development of large-scale integrated battery as the energy core components, their health status as key system uptime. The health status of the battery reaction in the electrochemical impedance spectroscopy. Fast, accurate measurement of battery electrochemical impedance spectroscopy battery life prediction and management of health significance. Respectively from two different angles in the frequency domain and time-domain measurements, electrochemical impedance spectroscopy measurement methods. First of all, from the traditional sweep principle, the principle of integrated virtual sweep signal generator instead of the traditional signal generator in the LabVIEW platform, modular the waveform component detection function to obtain the amplitude of the response signal value and a phase, which instead of the traditional or multiplier. Secondly, in order to solve the by-frequency measuring time-consuming problem of long, studied based on the measuring method of the full phase of the FFT, the method used by the excitation signal is generated by a sinusoidal signal on a plurality of frequencies. Superposition. Use of all phase FFT data processing method compared with traditional FFT phase FFT has the ability to better suppress spectral leakage and phase invariance, more accurate results. Compared with the sweep mode, the measured time is greatly reduced. Finally, the measurement of the Laplace transform analytic functions. Paper given step excitation transient current system time-domain response is obtained the analytic function expression in the form of time-domain response with a semi-logarithmic law. Laplace transform and analytic functions obtained, the frequency domain impedance expressions. Measurement method for measuring time is further reduced, and higher accuracy. To verify the measurement method for the two equivalent circuit tested experimentally measured results and the theoretical value and CS impedance spectroscopy tester and the results were compared to prove the effectiveness of the algorithm. Finally, the above-mentioned three methods used for the measurement of the lithium-ion battery electrochemical impedance spectroscopy. The comparative analysis of the results of the three measurement methods of this paper the three methods abandon the traditional signal generator, multiplier and other hardware structure is more simple and easy to the development of embedded integration direction; several measurement The horizontal method comparison results show that the principle of frequency domain measurement method based on the sweep, time-consuming and very long, especially at low frequencies. The time domain measurement method can greatly shorten the measuring time, wherein the measurement method based on the Laplace transform of the analytic function, with the shortest time; addition, the measurement method based on the Laplace transform of the analytic function, the acquisition discrete response signal converted into analytic function to study, and the resulting impedance spectrum is continuous and uniform, higher accuracy. Therefore, based on the Laplace transform method can achieve a quick test of the impedance spectrum measurement results are accurate, easy to hardware and software embedded integration, to meet the requirements of the application for rapid testing of battery performance.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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