Magnetism Versus LiFePO sub(4) Battery's State of Charge: A Feasibility Study for Magnetic-Based Charge Monitoring

In recent years, lithium ion batteries have become wide-spread energy sources for various battery-powered applications. In particular, LiFePO sub(4) batteries are increasingly used for high-power automotive and storage applications. Unfortunately, the state of charge (SOC) is not uniquely determined...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2015-11, Vol.64 (11), p.2959-2964
Main Authors: Gallien, Thomas, Krenn, Heinz, Fischer, Roland, Lauterbach, Stefan, Schweighofer, Bernhard, Wegleiter, Hannes
Format: Article
Language:English
Subjects:
Charge
Charging
Electric batteries
Electric charge
Feasibility studies
Magnetic permeability
Magnetic susceptibility
Rechargeable batteries
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Summary:In recent years, lithium ion batteries have become wide-spread energy sources for various battery-powered applications. In particular, LiFePO sub(4) batteries are increasingly used for high-power automotive and storage applications. Unfortunately, the state of charge (SOC) is not uniquely determined by measuring just the LiFePO sub(4) battery's open-circuit voltage. However, an alternative approach for SOC determination is introduced by investigating the battery's magnetic susceptibility. This is motivated by the iron atom's magnetic state in the LiFePO sub(4) cathode material, which changes during charging and discharging. The magnetic susceptibility of differently charged battery samples will be investigated to correlate the magnetic moment with the SOC in view of a new sensor concept.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2015.2437634