Abstract
In this paper an online method of broadband battery impedance spectroscopy is proposed in which the excitation signal is injected through the inner feedback loop of a DC/DC boost converter with average current-mode control (ACMC). By deriving the average state-space model of the conventional boost converter, it is shown that an open-loop converter exhibits a resonant frequency response in regards to the injected signal, whereas the compensated current loop in ACMC produces a controllable, flat-gain closed-loop transfer function that allows broadband current excitation signals to be injected into the battery without the distortion that is seen in the open-loop configuration. In the presented method, the converter is set to discharge the battery at a constant C-rate during impedance measurement while a broadband signal is superimposed onto the loop reference current. A low-dropout regulator is then used to filter out disturbances caused in the converter output. The proposed approach is experimentally implemented and a discrete-interval binary sequence signal is utilized to measure the impedance of two 18650 lithium-ion batteries in several arbitrary frequencies at once in the 0.1Hz-1kHz range. The measured spectra are validated by a commercial impedance analyzer.
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