Patents by Inventor Olivier BRIAT

Olivier BRIAT has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for evaluating the state of health of a lithium battery
    Patent number: 10036781
    Abstract: A method for assessing the health of a lithium battery comprising: a first step of recharging the battery at constant current, until the voltage at its terminals reaches a limit value; a second step of recharging the battery at constant voltage equal to the limit value, until the charging current drops below a threshold value, a plurality of measurements of the charging current being acquired during the second recharging step; and a step of estimating the state of health of the battery from at least one parameter of the second step of recharging at constant voltage, such as the parameter expressing the decrease of an exponential function interpolating charging current measurements, the energy supplied to the battery during the second step of recharging at constant voltage or the duration of the step of charging at constant voltage. A battery management system comprising an apparatus for implementing the method is provided.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: July 31, 2018
    Assignees: Centre National de la Recherche Scientifique, Universite de Bordeaux, Institut Polytechnique de Bordeaux
    Inventors: Jean-Michel Vinassa, Akram Eddahech, Olivier Briat
  • METHOD AND APPARATUS FOR EVALUATING THE STATE OF HEALTH OF A LITHIUM BATTERY
    Publication number: 20160245876
    Abstract: A method for assessing the health of a lithium battery comprising: a first step of recharging the battery at constant current, until the voltage at its terminals reaches a limit value; a second step of recharging the battery at constant voltage equal to the limit value, until the charging current drops below a threshold value, a plurality of measurements of the charging current being acquired during the second recharging step; and a step of estimating the state of health of the battery from at least one parameter of the second step of recharging at constant voltage, such as the parameter expressing the decrease of an exponential function interpolating charging current measurements, the energy supplied to the battery during the second step of recharging at constant voltage or the duration of the step of charging at constant voltage. A battery management system comprising an apparatus for implementing the method is provided.
    Type: Application
    Filed: October 1, 2014
    Publication date: August 25, 2016
    Inventors: Jean-Michel VINASSA, Akram EDDAHECH, Olivier BRIAT