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Batteries 2018, 4(3), 38; https://doi.org/10.3390/batteries4030038

An Experimental Setup with Alternating Current Capability for Evaluating Large Lithium-Ion Battery Cells

1
School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2
School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
3
Scania AB, SE-151 87 Södertälje, Sweden
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 2 August 2018 / Accepted: 6 August 2018 / Published: 13 August 2018
(This article belongs to the Special Issue Electrochemical Battery Lifetime Testing, Analysis and Estimation)
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Abstract

In the majority of applications using lithium-ion batteries, batteries are exposed to some harmonic content apart from the main charging/discharging current. The understanding of the effects that alternating currents have on batteries requires specific characterization methods and accurate measurement equipment. The lack of commercial battery testers with high alternating current capability simultaneously to the ability of operating at frequencies above 200 Hz, led to the design of the presented experimental setup. Additionally, the experimental setup expands the state-of-the-art of lithium-ion batteries testers by incorporating relevant lithium-ion battery cell characterization routines, namely hybrid pulse power current, incremental capacity analysis and galvanic intermittent titration technique. In this paper the hardware and the measurement capabilities of the experimental setup are presented. Moreover, the measurements errors due to the setup’s instruments were analysed to ensure lithium-ion batteries cell characterization quality. Finally, this paper presents preliminary results of capacity fade tests where 28 Ah cells were cycled with and without the injection of 21 A alternating at 1 kHz. Up to 300 cycles, no significant fade in cell capacity may be measured, meaning that alternating currents may not be as harmful for lithium-ion batteries as considered so far. View Full-Text
Keywords: alternating current; aging; battery testing; electric vehicles; GITT; HPPC; life cycle; lithium-ion batteries; ripple; SOC alternating current; aging; battery testing; electric vehicles; GITT; HPPC; life cycle; lithium-ion batteries; ripple; SOC
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Soares, R.; Bessman, A.; Wallmark, O.; Lindbergh, G.; Svens, P. An Experimental Setup with Alternating Current Capability for Evaluating Large Lithium-Ion Battery Cells. Batteries 2018, 4, 38.

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