Saft

Psa Automobiles Sa

Stellantis Auto Sas

Sebastien Laurent

Philippe Desprez

Gerard Barrailh

Sebastien Benjamin

Stephane Guichard

Nathalie Legrand

Cedric Gousset

Cyril Bykoff

Mouna Dahmani

The invention relates to a method for determining the value of one or more parameters relating to the state of health of at least one accumulator of a battery that is intended to provide electrical energy to an external application. A first state-of-health parameter related to the resistance of at least one electrochemical element of the battery is determined according to the method comprising: —a step (1) of determining the value of the state of charge of the electrochemical element, expressed as a percentage of a maximum state of charge; —a step (2) of verifying whether the determined value of the state of charge belongs to a sought range; —a step of repeating, as long as the result of the verification step (2) is not positive, the determination step (1) and then the verification step (2); —calculating the value of the first parameter as a function of at least the value of the state of charge determined during the last determination step (1).

Method for determining the value of a parameter related to the state of health of an electrochemical cell in a battery, system for electronic management of a battery, and corresponding battery

The invention relates to a method for determining the value of one or more parameters relating to the state of health of at least one accumulator of a battery that is intended to provide electrical energy to an external application, an electronic battery management system implementing this method, and a battery provided with this system. The method comprises the steps consisting in particular in: making a series of measurements of N samples, where N&#x2265;3, of at least the voltage, the current and the cumulative capacitance, at the terminals of said accumulator, when charging or discharging said accumulator; &#x2014;creating a minimization loop by varying a current value of the first parameter of the accumulator from a determined initial value, comprising the following steps: (i) calculating N estimated values of a second parameter linked to the state of charge of the accumulator from the current value of the first parameter and said N samples, respectively (ii) calculating N theoretical values of the second parameter (iii) varying the current value of the first parameter, repeating the preceding calculation steps for each variation of said current value of the first parameter, and determining the value of the first parameter as being the current value of the first parameter that minimizes the difference between the estimated values and the theoretical values of the second parameter.

Method for determining the value of parameters relating to the state of an accumulator of a battery, battery and electronic battery management system

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Merignac, France

Sebastien Laurent