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Impedance measurement of batteries under load

Abstract
The impedance of a lithium battery at a single state-of-charge (SoC) is obtained from the current and voltage response of the cell. Making this measurement is important in order to understand cell characteristics. There exist some impedance analysers which can make suitable measurements at a single SoC. Measuring this impedance at multiple SoC is slow and tedious especially at lower frequencies. We present a new method which computes the impedance over a range of SoC while simultaneously varying the SoC. The proposed method produces reliable data even when the device under test is behaving non-linearly. The data obtained from this measurement is validated by comparing impedance data obtained at different SoC from a cell under no load.
Type
Conference Contribution
Type of thesis
Series
Citation
Hasan, R., & Scott, J. B. (2019). Impedance measurement of batteries under load. Presented at the 2019 IEEE International Instrumentation and Measurement Technology Conference, Conference held Auckland, New Zealand.
Date
2019
Publisher
Degree
Supervisors
Rights
This is the author's accepted version. © 2019 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.