Nissan Motor Company Limited

Ampere S.a.s.

Stellantis Auto Sas

Renault S.a.s.

Akram Eddahech

Driemeyer Franco Ana-lucia

Kodjo Senou Rodolphe Mawonou

Kodjo-Senou-Rodolphe Mawonou

A method for estimating the charge state of a battery includes initializing the charge state, including estimating an initial charge state value. The initializing includes: receiving a stored charge state value for a sleep mode time of the battery, computing a charge state value from a measurement of the no-load voltage at the terminals of the battery at a wake-up time of the battery, and computing an error in the measurement of the no-load voltage due to the relaxation of the battery. The error is computed as a function of the current temperature of the battery and of a target relaxation duration modelled for each temperature. The initial value of the charge state is computed based on a comparison between the recorded and computed charge state values and as a function of the error.

Method for initializing the charge state of a battery

The invention relates to a method, implemented in a management system of an electric battery of a vehicle, for estimating the resistive state of health of at least one electrical energy storage element, the method comprising the next steps: —determining () at least one operating range for which the direct current resistance of the element changes linearly with respect to the state of charge of the element and to temperature; —measuring () the variation in the strength and the voltage of an electric current generated by the element during a running phase of the vehicle; —calculating (), based on the measured values of variation in strength and voltage, at least one direct current resistance value of the element; and —calculating () at least one value of the resistive state of health of the element based on the calculated direct current resistance value.

Method for estimating the resistive state of health of at least one electrical energy storage element of an electric battery

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Guyancourt, France

Akram Eddahech