Method for estimating state of charge of a rechargeable battery

Details Method for estimating state of charge of a rechargeable battery Method for estimating state of charge of a rechargeable battery

2011-08-16

2011-08-16

Dunn, Drew A (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

Reexamination Certificate

active

08000915

ABSTRACT:
An apparatus for accurately estimating the SOC of a rechargeable battery installed in a hybrid electric vehicle. A voltage variation measurement unit measures terminal voltage variation amount of the rechargeable battery in a no-battery-current state in which a charge-discharge current does not flow in the rechargeable battery. A polarization voltage calculator calculates a polarization voltage from the measured variation amount. An electromotive force calculator subtracts the polarization voltage from a non-load voltage in a state in which a charge-discharge path is open to calculate the electromotive force of the rechargeable battery. An SOC estimator estimates the SOC of the rechargeable battery based on the electromotive force.

REFERENCES:
patent: 7630842 (2009-12-01), Murakami
patent: 2003-197275 (2003-07-01), None
patent: 2007-292648 (2007-11-01), None

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