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首页> 外文期刊>IEEE Transactions on Industrial Electronics >An EV-Scale Demonstration of In-Situ Battery Electrochemical Impedance Spectroscopy and BMS-Limited Pack Performance Analysis
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An EV-Scale Demonstration of In-Situ Battery Electrochemical Impedance Spectroscopy and BMS-Limited Pack Performance Analysis

机译：An EV-Scale Demonstration of In-Situ Battery Electrochemical Impedance Spectroscopy and BMS-Limited Pack Performance Analysis

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摘要

State-of-power (SOP) and state-of-charge (SOC) estimation inaccuracy manifests throughout the electric vehicle (EV) battery lifetime due to the nonlinear degradation trajectory that is unique to each use-case. The inaccuracy leads to premature termination of charge and discharge operations, which results in the virtual loss of battery performance. In-situ electrochemical impedance spectroscopy (EIS) has been proposed to provide real-time battery impedance measurements, which can theoretically improve the SOP/SOC estimation accuracy. In this work, an EV-scale in-situ EIS system is demonstrated experimentally, from impedance measurement to equivalent circuit model (ECM) extraction. The pack-level discharge energy versus SOP/SOC estimation errors is also simulated, which quantifies the virtual loss of battery performance. The measured-impedance error tolerance of three common ECM extraction techniques is then examined through a randomized set of simulated EIS tests with injected measurement noise. Finally, in-situ impedance measurement is performed on 20 battery submodules using an electric pickup truck EIS system. The ECM-predicted voltage output is compared against measured driving data. Experimental results indicate approximately 8#x0025;#x2013;9#x0025; improvement in SOP estimation accuracy at 3 $^{circ }$ C and 10 $^{circ }$ C between the in-situ extracted models and a representative baseline.

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