Patents by Inventor Hans-Joachim Humbert

Hans-Joachim Humbert 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).

  • Cell temperature and degradation measurement in lithium ion battery systems using cell voltage and pack current measurement and the relation of cell impedance to temperature based on signal given by the power inverter
    Patent number: 8994340
    Abstract: A method and system for determining the temperature of cells in a battery pack, without using temperature sensors, by measuring the impedance of the cells and using the impedance to determine the temperature. An AC voltage signal is applied to the battery pack, and a time sample of voltage and current data is obtained. The voltage and current data is narrowed down to a simultaneous time window of interest, and a fast fourier transformation is performed on the windowed voltage and current data to identify voltage and current magnitudes at one or more specific frequencies. The voltage and current magnitudes are used to determine the impedance at the one or more frequencies. Finally, the impedance is used to determine the temperature of the cell or cells using a look-up table, where the impedance, the frequency, and a state of charge are used as input parameters for the look-up.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: March 31, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Roland Matthe, Hans-Joachim Humbert, Konrad Kowalczyk
  • CELL TEMPERATURE AND DEGRADATION MEASUREMENT IN LITHIUM ION BATTERY SYSTEMS USING CELL VOLTAGE AND PACK CURRENT MEASUREMENT AND THE RELATION OF CELL IMPEDANCE TO TEMPERATURE BASED ON SIGNAL GIVEN BY THE POWER INVERTER
    Publication number: 20130307487
    Abstract: A method and system for determining the temperature of cells in a battery pack, without using temperature sensors, by measuring the impedance of the cells and using the impedance to determine the temperature. An AC voltage signal is applied to the battery pack, and a time sample of voltage and current data is obtained. The voltage and current data is narrowed down to a simultaneous time window of interest, and a fast fourier transformation is performed on the windowed voltage and current data to identify voltage and current magnitudes at one or more specific frequencies. The voltage and current magnitudes are used to determine the impedance at the one or more frequencies. Finally, the impedance is used to determine the temperature of the cell or cells using a look-up table, where the impedance, the frequency, and a state of charge are used as input parameters for the look-up.
    Type: Application
    Filed: May 15, 2012
    Publication date: November 21, 2013
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Roland Matthe, Hans-Joachim Humbert, Konrad Kowalczyk