System and method for battery parameter recharacterization
AssigneeGarrett Transportation I Inc.
InventorsAbhijith Vikraman Pillai Santhamma, Tomas Poloni
Life of this patent
Estimating the term…
Abstract
Methods and systems for estimating a battery parameter for a rechargeable battery. A sequence of a first zero current period, a first battery measurement of the first battery circuit, delivery of a known quantity of charge to the first battery circuit, a second zero current period, and a second battery measurement is performed. The known quantity of charge may be obtained from various sources. The battery parameter is estimated using an inverted open circuit voltage model, the first and second battery voltage measurements, and the known quantity of charge. The battery parameter may be a battery capacity and/or battery state of health.
Claims19
A method of estimating a first battery parameter for a first battery circuit in a battery pack, the battery pack also including a second battery circuit, the method comprising:
- with the first battery circuit at a first state of charge, enforcing a first zero current period in which the first battery circuit is neither charged nor discharged from the first state of charge;
- at the end of the first zero current period, obtaining a first battery voltage measurement from the first battery circuit;
- delivering to the first battery circuit a first known quantity of charge by issuing pulses of current to the first battery circuit from the second battery circuit;
- enforcing a second zero current period in which the first battery circuit is neither charged nor discharged;
- at the end of the second zero current period, obtaining a second battery voltage measurement from the first battery circuit;
- determining the first battery parameter using an inverted open circuit voltage model, the first and second battery voltage measurements, and the first known quantity of charge.
A method of estimating a battery parameter, the battery including at least a first battery circuit comprising one or more battery cells, the battery being a component of a vehicle having an electric motor drive and an onboard charging circuit configured to receive a power signal from a power source external to the vehicle and convert the power signal to a charging signal for use in charging the battery, the method comprising:
- with the first battery circuit at a first state of charge and with the vehicle coupled to power source, enforcing a first zero current period in which the first battery circuit is neither charged nor discharged from the first state of charge;
- at the end of the first zero current period, obtaining a first battery voltage measurement from the first battery circuit;
- delivering to the first battery circuit a known quantity of charge by issuing pulses of current to the first battery circuit from the onboard charging circuit;
- enforcing a second zero current period in which the first battery circuit is neither charged nor discharged;
- at the end of the second zero current period, obtaining a second battery voltage measurement from the first battery circuit;
- and
- determining the battery parameter for the first battery circuit using an inverted open circuit voltage model, the first and second battery voltage measurements, and the known quantity of charge.
A method of estimating a battery parameter, the battery including at least a first battery circuit comprising one or more battery cells, the battery being a component of a
- vehicle having an electric motor drive, the vehicle being couplable to an external charger, the method comprising:
- with the first battery circuit at a first state of charge, enforcing a first zero current period in which the first battery circuit is neither charged nor discharged from the first state of charge;
- at the end of the first zero current period, obtaining a first battery voltage measurement from the first battery circuit;
- delivering to the first battery circuit a known quantity of charge by issuing pulses of current to the first battery circuit from the external charger;
- enforcing a second zero current period in which the first battery circuit is neither charged nor discharged;
- at the end of the second zero current period, obtaining a second battery voltage measurement from the first battery circuit;
- and
- determining the battery parameter for the first battery circuit using an inverted open circuit voltage model, the first and second battery voltage measurements, and the known quantity of charge.
Dependencies are inferred from the claim text.