Renault S.a.s.

Nissan Motor Company Limited

Verkor

Bruno Delobel

Antoine Saint-Marcoux

Michel Mensler

Masato Origuchi

Juan-Pablo Soulier

Philippe Recouvreur

Yvan Reynier

Marc-Henri Giraud

Claire Oberti

Julien Marie

Anais Ricaud

Thomas Creach

Laureline Marchal

Florence Masse

Benoit Arsac

Adrien Chalumeau

Christophe Mille

Rafael Acosta Laisequilla

Franco Ana Lucia Driemeyer

Gauthier Fontaine

Antoine Saint Marcoux

Mohamed Chakir

A method for detecting a faulty cell in an electric battery pack includes the following steps: measuring the no-load voltage at the terminals of each cell of the battery pack; calculating the deviation between the no-load voltage measured at the terminals of the cell and an average known no-load voltage as a function of the number of days during which the battery pack was not used; calculating the difference between the calculated deviation and a quantity n·σ, n being an integer no lower than 1, and σ being a known standard deviation which is a function of the number of days during which the battery pack was not used; and detecting a faulty cell if the difference is greater than zero.

Method for detecting a faulty cell in an electric battery

A method for estimating a state of health of an electrochemical cell for storing electrical energy includes applying at least one current strength peak to the cell, the current peak passing through the cell, measuring a variation, as a function of a time t elapsed after the application of the current peak, of voltage U at the terminals of the cell, and calculating at least one coefficient &#x3b1;and at least one coefficient Usuch that the function &#x221a;{square root over (t)}&#x2192;&#x3b1;&#xd7;&#x221a;{square root over (t)}+Uis a linear approximation of the variation of the voltage U as a function of &#x221a;{square root over (t)} for &#x221a;{square root over (t)}&#x2265;C, where C&#x3e;0. The method is used in electrical or hybrid vehicles.

Method for estimating the state of health of an electrochemical cell for storing electrical energy

A method for managing an authorized operating range of a battery, the authorized operating range being limited between a minimum level and a maximum level of state of charge of the battery. The method includes estimating a state of health in power of the battery, the state of health in power characterizing capacity of the battery to supply a minimum required power level across an entirety of the operating range; and determining the minimum level of state of charge of the battery in accordance with the estimated state of health in power, the minimum level of state of charge being increased when the state of health in power decreases.

Method for managing the operating range of a battery

A method manages a state of charge of a traction battery of a rechargeable hybrid vehicle including a hybrid power train to provide propulsion. The battery being capable of operating according to a first operating mode over a state of charge range, of which an amplitude is bounded by predefined maximum and minimum state of charge values, in which the battery supplies substantially all power necessary for propulsion, and a second operating mode, in which the state of charge of the battery is kept substantially constantly around an equilibrium state of charge value. The method includes estimating an ageing state of the battery, comparing the estimated ageing state of the battery in relation to a given ageing state threshold, and reducing the amplitude of the state of charge range linked to the first operating mode when the ageing state of the battery rises above the given ageing state threshold.

Method for energy management of a rechargeable traction battery of a hybrid vehicle

A method for managing an electrochemical accumulator or a storage battery includes determining an estimated value of a state of deterioration of the accumulator from the accumulator's history of voltage values, intensity of current flow, and temperature. The estimated value is a barycentric value of the state of deterioration calculated as a barycenter of at least two values. The at least two values include a first value indicative of the state of deterioration of the accumulator calculated by a first method and a second value indicative of the state of deterioration of the accumulator calculated by a second method different from the first method. From an initial commissioning state of the accumulator, barycentric coefficients are varied at least once to calculate the next barycentric value when a previous value of the state of deterioration of the accumulator, calculated according to the first method, has passed a first threshold.

Estimation of the state of deterioration of an electric battery

A method for managing the charge of a battery comprising:

Management of the charge of a battery

An electrochemical electricity storage cell including a casing including: at least two positive electrodes connected to a positive terminal, at least two negative electrodes connected to a negative terminal, the positive and negative electrodes being stacked in an alternating manner in the casing. At least one spacer is placed between each of the positive and negative electrodes. At least one contact element is placed in contact with the positive and negative electrodes and the casing.

Electrochemical electricity storage cell

A method for charging a motor vehicle battery includes determining the electrolyte resistance frequency of the cell, determining the battery charge transfer resistance frequency, and charging the battery with a current at a charging current frequency greater than the electrolyte resistance frequency of the battery and less than the battery charge transfer resistance frequency.

Method and system for charging a motor vehicle battery according to temperature

An automotive vehicle with electric or hybrid propulsion including a rechargeable electric accumulation battery and a braking system allowing recovery of energy, the battery being rechargeable during braking phases and during charging phases under control of a supply system including a mechanism determining a maximum allowable power for the battery. The mechanism determining the maximum allowable power for the battery includes a first mapping making it possible to read a first maximum power on the basis of a temperature and of a state of charge of the battery, and a second mapping making it possible to read a second maximum power based on the temperature and of the state of charge of the battery.

Growing community of inventors

Issy les Moulineaux, France

Bruno Delobel