US 11,703,548 B2
Methods and systems for accelerated determining of state of health using incremental capacity analysis
Aleksey Yezerets, Columbus, IN (US); and Guodong Fan, Columbus, IN (US)
Assigned to CUMMINS INC., Columbus, IN (US)
Filed by Cummins Inc., Columbus, IN (US)
Filed on Mar. 18, 2021, as Appl. No. 17/205,330.
Claims priority of provisional application 63/004,742, filed on Apr. 3, 2020.
Prior Publication US 2021/0311129 A1, Oct. 7, 2021
Int. Cl. G01R 31/392 (2019.01); G01R 31/385 (2019.01)
CPC G01R 31/392 (2019.01) [G01R 31/385 (2019.01)] 18 Claims
OG exemplary drawing
 
1. A computer-implemented method for determining state of health of a battery, the method comprising:
conditioning the battery by charging the battery from an initial state of charge of the battery to a first target state of charge via a predetermined multi-stage charging sequence which includes:
charging the battery from the initial state of charge to a first intermediate state of charge at a first charging rate;
charging the battery from greater than or equal to the first intermediate state of charge to a second intermediate state of charge at a second charging rate smaller than the first charging rate; and
charging the battery from greater than or equal to the second intermediate state of charge to the first target state of charge at the third charging rate smaller than the second charging rate; and
charging the battery from the first target state of charge to a second target state of charge at an incremental capacity analysis (ICA) charging rate;
acquiring a voltage vs. capacity (QV) data of the battery during charging of the battery from the first target state of charge to the second target state of charge;
obtaining an incremental capacity (IC) data based on at least the acquired QV data;
pre-processing the IC data;
extracting an ICA peak from the IC data; and
determining the state of health of the battery based at least in part upon the ICA peak.