Abstract
The internal impedance of a battery has been shown to change as a function of state-of-charge (SOC) and state-of-health (SOH). Therefore, online impedance measurements can provide useful information for SOC- and SOH-estimation algorithms. Broadband injections techniques such as pseudo-random-binary-sequence (PRBS) are attractive alternative for replacing conventional electrochemical-impedance-spectroscopy (EIS) which is very slow for online battery impedance measurements. However, non-linearities of batteries have a negative impact on the measurement results obtained by the PRBS for which the identified system is assumed to be linear. This paper demonstrates the use of ternary-sequence excitation signal for battery impedance measurements. Appropriately designed ternary-sequence can efficiently capture the linear component of the impedance by canceling out the distortion caused by the non-linear parts. The presented method can be used for rapid impedance measurements and thus, as a valuable tool in online SOC- and SOH-estimation algorithms. Experimental measurements are shown from a Lithium-Iron-Phosphate (LiFePO4) battery cell.
Originalsprog | Engelsk |
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Titel | Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition (ECCE) |
Antal sider | 7 |
Forlag | IEEE Press |
Publikationsdato | sep. 2018 |
Sider | 2705-2711 |
ISBN (Trykt) | 978-1-4799-7313-2 |
ISBN (Elektronisk) | 978-1-4799-7312-5 |
DOI | |
Status | Udgivet - sep. 2018 |
Begivenhed | IEEE Energy Conversion Congress & Exposition ECCE 2018 - Portland, USA Varighed: 23 sep. 2018 → 27 sep. 2018 http://www.ieee-ecce.org/2018/ |
Konference
Konference | IEEE Energy Conversion Congress & Exposition ECCE 2018 |
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Land/Område | USA |
By | Portland |
Periode | 23/09/2018 → 27/09/2018 |
Internetadresse |
Navn | IEEE Energy Conversion Congress and Exposition |
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ISSN | 2329-3721 |