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3. Incremental Capacity Analysis as a State of Health Estimation Method for Lithium-Ion Battery Modules with Series-Connected Cells

Author

Krupp, Amelie, Ferg, Ernst E., Schuldt, Frank, Derendorf, Karen, and Agert, Carsten

Subjects
lcsh:Production of electric energy or power. Powerplants. Central stations, lcsh:Industrial electrochemistry, state-of-health, lithium-ion batteries, incremental capacity analysis, lcsh:TK1001-1841, Institut für Vernetzte Energiesysteme, battery module, lcsh:TP250-261
Abstract

Incremental capacity analysis (ICA) has proven to be an effective tool for determining the state of health (SOH) of Li-ion cells under laboratory conditions. This paper deals with an outstanding challenge of applying ICA in practice: the evaluation of battery series connections. The study uses experimental aging and characterization data of lithium iron phosphate (LFP) cells down to 53% SOH. The evaluability of battery series connections using ICA is confirmed by analytical and experimental considerations for cells of the same SOH. For cells of different SOH, a method for identifying non-uniform aging states on the modules’ IC curve is presented. The findings enable the classification of battery modules with series and parallel connections based on partial terminal data.

Published
2021

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