Method and apparatus for estimating state of charge of...

Details Method and apparatus for estimating state of charge of... Method and apparatus for estimating state of charge of...

2008-04-08

2008-04-08

Vu, Bao Q. (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

C320S107000

Reexamination Certificate

active

07355411

ABSTRACT:
When a power switch portion10is in an open state and a charge/discharge path of the secondary battery100is in a disconnected state, an electromotive force calculation portion109calculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portion113from an open-circuit voltage OCV measured by a voltage measurement portion102. Based on the electromotive force, a state-of-charge estimation portion110estimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.

REFERENCES:
patent: 6417668 (2002-07-01), Howard et al.
patent: 2002/0030494 (2002-03-01), Araki et al.
patent: 2004/0257087 (2004-12-01), Murakami
patent: 2002-365347 (2002-12-01), None
patent: 2003-197275 (2003-07-01), None

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