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    Battery impedance measurement using sinusoidal ripple current emulator

    Access Status
    Fulltext not available
    Authors
    Hossain, M.
    Islam, Syed
    Park, S.
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    Hossain, M. and Islam, S. and Park, S. 2017. Battery impedance measurement using sinusoidal ripple current emulator, 2017 IEEE Energy Conversion Congress and Exposition (ECCE 2017), pp. 2754-2759.
    Source Title
    2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
    Source Conference
    2017 IEEE Energy Conversion Congress and Exposition (ECCE 2017)
    DOI
    10.1109/ECCE.2017.8096515
    ISBN
    9781509029983
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/67691
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 IEEE. This paper presents a sinusoidal ripple current (SRC) emulator which superimposes an ac ripple current frequency into a dc charging current in order to produce a sinusoidal ripple current without a ripple current controller. It can be used for several purposes:1) to analyze the impact of ac ripple current magnitude and frequency on the battery internal characteristics; 2) to determine the parameters related to thermal rise and lithium plating; 3) to obtain more updated parameter information for improved utilization of a battery; 4) to determine the optimal ripple current frequency at the minimum impedance point by sweeping the ripple current frequency; 5) to utilize the obtained impedance data for estimating the battery circuit parameters and SOC level. The internal characteristics of batteries are complex and dynamic; therefore, it is beneficial to use the SRC emulator to validate SRC performance in a battery stack before integrating a SRC algorithm into a battery charger. This paper describes the development procedure of a SRC emulator to produce the electrochemical impedance spectroscopy (EIS) measurement for measuring the battery internal impedance. In order to validate the performance of the SRC emulator, a 12.8 V, 40 Ah Li-ion battery was charged at C/8 rate in CC mode with ± 1 App ac ripple current perturbation with an impedance from 20 Hz to 2 kHz.

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