Method and apparatus for fast charging Li based rechargable batteries
AssigneeAdvanced Battery Management Systems, LLC
InventorsAttila Reisz, Jozsef Marinka-Toth, Bill Hart
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Abstract
A method and system for charging a rechargeable battery, such as a Lithium based battery, by applying a voltage charge signal, and monitoring a battery charging current and a varying internal resistance of the rechargeable battery and changes in open circuit voltage of the rechargeable battery. The voltage charge signal is dynamically established as a function of the varying internal resistance of the rechargeable battery during charging and the changes in open circuit voltage of the rechargeable battery. The voltage charge signal is a function of a state of charge (SOC) of the rechargeable battery.
Claims14
A method of charging a rechargeable battery, the method comprising the following steps:
- determining, by a controller, a changing battery impedance of said rechargeable battery while applying a charging voltage signal to the rechargeable battery;
- determining, by the controller, an open circuit voltage of the rechargeable battery;
- modifying, by the controller, the charging voltage signal as a function of the determined changing battery impedance and the open circuit voltage of said rechargeable battery;
- and
- determining, by the controller, a battery temperature of the rechargeable battery during charging, wherein when the battery temperature is determined to increase by an amount less than a first predetermined limit, a voltage level of the charging voltage signal is reduced.
A system configured to charge a rechargeable battery, the system comprising a controller configured to:
- determine a changing battery impedance while applying a charging voltage signal to the rechargeable battery;
- determine an open circuit voltage of the rechargeable battery;
- modify the charging voltage signal as a function of the determined changing battery impedance and the open circuit voltage of the rechargeable battery;
- and
- determine a battery temperature of the rechargeable battery by the controller during charging, wherein when the battery temperature is determined to increase by an amount less than a first predetermined limit, a voltage level of the charging voltage signal is configured to be reduced.
Dependencies are inferred from the claim text.