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US 8,552,687 B2Granted
Method and system for characterizing a battery
AssigneeGM Global Technology Operations LLC
InventorsJian Lin, Xidong Tang, Xiaodong Zhang, Brian J. Koch, Damon R. Frisch, Wei Liu, Michael J. Gielniak
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Abstract
Methods and systems are provided for characterizing a battery. A property of the battery is measured. A dynamic characteristic of the battery is determined from a second order linear dynamic model.
Claims19
A method for characterizing a battery comprising:
- measuring a property of the battery;
- determining a dynamic characteristic generated by a second order linear dynamic model of the battery, wherein the model is a function of the measured property;
- and
- observing the dynamic characteristic by a circuit comprising two resistor-capacitor pairs in series, the voltage across one of the resistor-capacitance pair is a double layer voltage and the voltage across the other resistance-capacitance pair is a diffusion voltage.
1 more element
A method for determining a state of charge of a lithium ion battery comprising:
- measuring at least one property of the lithium ion battery;
- observing a dynamic characteristic determined from a second order linear dynamic model of the battery by a circuit comprising two resistor-capacitor pairs in series, the voltage across one of the resistor-capacitance pair is a double layer voltage and the voltage across the other resistance-capacitance pair is a diffusion voltage, wherein the model is a function of the at least one measured property;
- and
- determining the state of charge of the battery based on the dynamic characteristic.
1 more element
A method for determining a state of charge of a lithium ion battery comprising:
- identifying the double layer capacitance of the battery as a dynamic characteristic of the battery from a second order linear dynamic model;
- determining a double layer capacitance of the lithium ion battery by a circuit comprising two resistor-capacitor pairs in series, the voltage across one of the resistor-capacitance pair is a double layer voltage and the voltage across the other resistance-capacitance pair is a diffusion voltage;
- and
- determining the state of charge of the battery based on the double layer capacitance.
1 more element
Dependencies are inferred from the claim text.