Patent ID: 11860233
Assignee: HONDA MOTOR CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 5:
6. The battery unit according to claim 5, wherein the battery state estimator
estimates a SOH of the battery cell, from a ratio between a length mAh of a line segment between peaks of the differential characteristics of the measured UH vs. SOC present characteristics and a length mAh of a line segment between the peaks of the differential characteristics of the measured UH vs. SOC initial characteristics stored in the storage,
calculates ΔSOC corresponding to the calculated charge capacity Q(t), according to formulas below;

ΔSOC=Q(t)/C0(t); and

C0(t)=C0×SOH, wherein

C0(t) is a present overall capacity,
C0 is an initial overall capacity, and
t is an elapsed time, and
calculates the SOC(OCV) based on the calculated ΔSOC and the start SOC estimated at the start of the charge.