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

摘要

The invention relates to a method for determining the open circuit voltage of an electrochemical accumulator. The method comprises the steps of measuring (202) continuously a voltage signal, calculating (203) continuously a logarithmic signal of the voltage dependent on said voltage signal as a function of the value in logarithmic form of time. , checking (205) whether the logarithmic signal has an inflection point, and, if at least one inflection point is detected at a second instant, the estimation (207a) of the open circuit voltage parameter symmetrically with respect to the inflection point as a function at least of the value of the logarithmic signal at the second instant. The invention is particularly applicable to the management of motor vehicle powertrain battery systems.