Method for determining battery capacity

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system

Reexamination Certificate

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Reexamination Certificate

active

08010305

ABSTRACT:
An electrical device is powered by a battery. The device includes transition phase determining circuitry operatively connected to the battery to determine that the battery has entered a transition phase based on the occurrence of a change in direction of current flowing through the battery. Battery capacity determining circuitry is operatively connected to the transition phase determining circuitry and configured to determine, in response to the transition phase determining circuitry determining that the battery is in the transition phase, a capacity of the battery based on a transition phase battery capacity model of capacity-vs.-voltage. The transition phase determining circuitry is further configured to determine an end of the transition phase based on the transition phase battery capacity model and a non-transition battery capacity model of capacity-vs.-voltage yielding the same capacity value for a given measured voltage of the battery.

REFERENCES:
patent: 2001/0022518 (2001-09-01), Asakura et al.
patent: 2003/0008202 (2003-01-01), Tran
patent: 2004/0220758 (2004-11-01), Barsoukov et al.
patent: 2005/0001627 (2005-01-01), Anbuky et al.
patent: 2005/0029988 (2005-02-01), Tran
patent: 2005/0225301 (2005-10-01), Arnold et al.
patent: 2005/0269993 (2005-12-01), Palanisamy et al.
patent: 2006/0049805 (2006-03-01), Tran
patent: 2 518 757 (1983-06-01), None

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