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Energy Storage Systems

T39.5 - Breaking the Constant-Current Barrier: ICA-Based Battery Health Estimation Under Real-World EV Operating Conditions

Thursday, March 26, 2026
11:40 AM - 12:00 PM CT
Location: 217C
This digest proposes an extended incremental capacity analysis (ICA) method for lithium ion battery state of health (SOH) estimation that enables its application to dynamic driving data from electric vehicles (EVs) rather than being confined to low C rate constant current conditions. The method reconstructs the open circuit voltage (OCV) by removing polarization voltage components from the dynamic terminal voltage collected during EV operation. Subsequently, it analyzes peak variations in the IC curves derived from this reconstructed OCV to estimate SOH effectively. Validation on 4.85 Ah cylindrical cells aged under the urban dynamometer driving schedule (UDDS) profile demonstrates a mean estimation error of 0.77 % and a maximum error of 2.33 %.