Fast lock-in amplifier electrochemical impedance spectroscopy for big capacity lead-acid battery. (August 2021)

• Record Type: Journal Article
• Authors: Wang, Wubin; Chen, Dong; Yao, Wenxi; Chen, Wei; Lu, Zhengyu
• Is Part Of: Journal of energy storage. Volume 40(2021)
• Publication Date: 2021-08
• Subjects: 4000 (Ah) VRLA -- Linear average definite integrator -- Adaptive phase shift -- Fast Fourier transform -- Online EIS; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2021.102693
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: Linear average definite integrator takes place of low pass filter. Fundamental frequency component extraction by at partial periods. Online EIS at the Low frequency band (1~16.67 Hz) by Microcontroller. Detection of weak internal impedance of big capacity (4200 Ah ) VRLA battery. Abstract: Big capacity (>4000 Ah ) lead acid battery is necessary to important emergency power system. Electrochemical impedance spectroscopy (EIS) of the battery is weak. Low frequency Digital Lock-in Amplifier (DLA) needs long-term sampling. Fast Fourier Transformation (FFT) needs whole number periods sampling. This paper suggests a Fast Lock-in Amplifier (FLA). It takes place of low pass filter with linear average definite digital Integrator. The FLA can output at short-term and partial period sampling. Its result is a fast linear interpolation of FFT. Results of FLA and FFT are identical at whole number periods sampling. The proposed method is verified by Valve-Regulated Lead-Acid (VRLA) battery (4200 Ah ) aging tests. Microcontroller runs the proposed algorithm.