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TUTCRIS

Novel online fitting algorithm for impedance-based state estimation of Li-ion batteries

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoIECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
KustantajaIEEE
Sivut4531-4536
Sivumäärä6
ISBN (elektroninen)978-1-7281-4878-6
ISBN (painettu)978-1-7281-4879-3
DOI - pysyväislinkit
TilaJulkaistu - lokakuuta 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaAnnual Conference of the IEEE Industrial Electronics Society -
Kesto: 1 tammikuuta 1900 → …

Julkaisusarja

NimiAnnual Conference of the IEEE Industrial Electronics Society
ISSN (painettu)1553-572X
ISSN (elektroninen)2577-1647

Conference

ConferenceAnnual Conference of the IEEE Industrial Electronics Society
Ajanjakso1/01/00 → …

Tiivistelmä

The impedance of a Li-ion battery is an important parameter for the battery's state-of-charge (SOC) and state-of-health (SOH) estimation. Battery impedance is typically modeled by an equivalent-circuit-model (ECM) in which the variations in the specific model parameters can be used for estimating the SOC and the SOH. However, the fact that the battery impedance is highly non-linear complicates the parameterization of the model. The model is traditionally obtained by a complex non-linear least-squares fitting algorithm which comes with high complexity. This paper proposes a novel approach to extract all the ECM parameters of the battery impedance obtained with online-capable pseudo-random-sequence (PRS) measurements. Although the algorithm has low complexity, it still captures the desired variations in the ECM parameters as a function of SOC. The algorithm is validated for the impedance data from a lithium-iron-phosphate cell.

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