METHOD FOR ESTIMATING THE OPEN-CIRCUIT VOLTAGE OF AN ELECTROCHEMICAL ACCUMULATOR OF A BATTERY SYSTEM

摘要

The invention relates to a method for determining the open-circuit voltage of an electrochemical accumulator. The method comprises the steps of continuously measuring (202) a voltage signal, continuously calculating (203) a logarithmic signal of the voltage depending on said voltage signal as a function of the value in logarithmic form of time, checking (205) whether the logarithmic signal contains a point of inflection and, in the event of detecting at least one point of inflection at a second time, estimating (207a) the open-circuit voltage parameter symmetrically about the point of inflection as a function at least of the value of the logarithmic signal at the second time. The invention is applicable in particular to the management of motor vehicle drivetrain battery systems.