US 2011/0215761 A1Published application

Method for determining the state of charge of a battery in charging or discharging phase

AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, Institut Polytechnique De Grenoble

InventorsRemy Mingant, Christine Lefrou, Yvan Reynier

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Abstract

The method for determining the state of charge of a battery includes measurement of an electric parameter of the battery during a charging or discharging phase of the battery followed by placing the battery in open circuit during a rest period. During the rest period, at least two values of the voltage at the battery terminals are measured. An indicator is then calculated according to the electric parameter and to values of the voltage measured during the rest period, and the state of charge corresponding to this indicator is then determined by means of a calibration curve representative of the variations of the indicator as a function of the state of charge of the battery.

Claims6

Dependent claims

A method for determining the state of charge of a battery during a charging or discharging phase of the battery, comprising the following successive steps in the course of said phase:

measurement of an electric parameter of the battery,
placing the battery in open circuit during a rest period,
measuring at least first and second values of the voltage at the terminals of the battery at different times during the rest period,
determining an indicator according to said electric parameter and to the voltage values measured during the rest period,
and determining the state of charge corresponding to the indicator by means of a calibration curve representative of the variations of the indicator as a function of the state of charge during the charging or discharging phase.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/125,688Filed 28 Oct 2009
Priority: FR 080604530 Oct 2008
Published: 8 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01R 31/3648
Constructional arrangements: comprising digital calculation means, e.g. for performing an algorithm
G01R 31/3835
Arrangements for monitoring battery or accumulator variables, e.g. SoC: involving only voltage measurements
G01R 31/3842
Arrangements for monitoring battery or accumulator variables, e.g. SoC: combining voltage and current measurements
G01R
Measuring electric variables