Engineering and Technology

Balancing resistor-based online electrochemical impedance spectroscopy in battery systems: opportunities and limitations

A. Blömeke, H. Zappen, et al.

This groundbreaking study examines the innovative use of existing balancing resistors in battery management systems for online electrochemical impedance spectroscopy measurements. Conducted by a team of experts including Alexander Blömeke and Hendrik Zappen, the research highlights the feasibility, potential strategies for optimization, and the challenges surrounding this novel approach.... show more

Abstract

Active dissipative balancing systems are widely used in battery packs to equalize cell state-of-charge (SoC) differences. This study investigates reusing balancing resistors as excitation elements for online electrochemical impedance spectroscopy (EIS) to enable in situ battery diagnostics. We analyze feasibility and limits, propose a signal-processing-based formula to reduce hardware demands, and quantify signal-to-noise-ratio (SNR) trade-offs. We show that quadrupling sampling rate, averaging count, or FFT size, or quartering input bandwidth, each yields an SNR gain equivalent to +1 ADC bit. A demonstrator validates practicality and delineates constraints from balancing current magnitude, thermal behavior, wiring, and ADC precision.

Publisher

Communications Engineering

Published On

Apr 13, 2024

Authors

Alexander Blömeke, Hendrik Zappen, Florian Ringbeck, Fabian Frie, David Wasylowski, Dirk Uwe Sauer

DOI

https://doi.org/10.1038/s44172-024-00203-6

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