SYSTEM FOR DETERMINING BATTERY IMPEDANCE
First Claim
1. A method for real-time characterization of a battery in a power system, the method comprising:
- between startup and shutdown of the power system, operating the power system by;
providing electric power to one or more electrical power loads of the power system,charging and discharging the battery based on power needs of the one or more electrical power loads,with at least one information-processing device, monitoring for a circumstance where the charging and discharging of the battery based on the power needs of the one or more electrical power loads results in a terminal voltage of the battery substantially equaling an open-circuit voltage of the battery and recording the measured terminal voltage as a first measured voltage,with the at least one information-processing device, monitoring for a circumstance subsequent to the terminal voltage substantially equaling the open-circuit voltage when charging and discharging the battery based on the power needs of the electrical power loads results in battery current larger than a predetermined value and recording an existing terminal voltage as a second measured voltage, andwith the at least one information-processing device, using the first measured voltage and the second measured voltage to determine a measured internal impedance of the battery.
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Accused Products
Abstract
A method for real-time characterization of a battery includes providing electric power to one or more electrical power loads, charging and discharging the battery based on power needs of the one or more electrical power loads, and monitoring for a circumstance where charging and discharging of the battery results in terminal voltage of the battery substantially equaling open-circuit voltage of the battery and recording the measured terminal voltage as a first measured voltage. The method may also include monitoring for a subsequent circumstance subsequent when charging and discharging the battery results in battery current larger than a predetermined value and recording an existing terminal voltage as a second measured voltage. The method may also include using the first and second measured voltages to determine a measured internal impedance of the battery. These actions may be performed between startup and shutdown of the power system.
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Citations
20 Claims
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1. A method for real-time characterization of a battery in a power system, the method comprising:
between startup and shutdown of the power system, operating the power system by; providing electric power to one or more electrical power loads of the power system, charging and discharging the battery based on power needs of the one or more electrical power loads, with at least one information-processing device, monitoring for a circumstance where the charging and discharging of the battery based on the power needs of the one or more electrical power loads results in a terminal voltage of the battery substantially equaling an open-circuit voltage of the battery and recording the measured terminal voltage as a first measured voltage, with the at least one information-processing device, monitoring for a circumstance subsequent to the terminal voltage substantially equaling the open-circuit voltage when charging and discharging the battery based on the power needs of the electrical power loads results in battery current larger than a predetermined value and recording an existing terminal voltage as a second measured voltage, and with the at least one information-processing device, using the first measured voltage and the second measured voltage to determine a measured internal impedance of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power system, comprising:
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a battery; one or more electrical power loads; and power-system controls configured to coordinate operation of the power system between startup and shutdown of the power system, including controlling supply of electric power to the electrical power loads, controlling charging and discharging of the battery based on power needs of the one or more electrical power loads, monitoring for a circumstance where the charging and discharging of the battery based on the power needs of the one or more electrical power loads results in battery current remaining smaller than a reference value for a reference period, and when this circumstance occurs, recording a terminal voltage of the battery as a first measured voltage, monitoring for a circumstance subsequent to the terminal voltage substantially equaling the open-circuit voltage when charging and discharging the battery based on the power needs of the electrical power loads results in battery current larger than a predetermined value and recording an existing terminal voltage as a second measured voltage, and using the first measured voltage and the second measured voltage to determine a measured internal impedance of the battery. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of operating a power system with a battery, the method comprising:
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estimating an internal impedance of the battery with at least one information-processing device; determining with the at least one information-processing device a first current magnitude based on voltage limits for the battery and the estimated internal impedance; comparing with the at least one information-processing device the first current magnitude and a second current magnitude to determine which of the first and second current magnitudes is smaller, the second current magnitude being a limit for a magnitude of current for at least one component of the power system; and calculating with the at least one information processing device a charging or discharging power limit for the battery based on whichever of the first and second current magnitudes is smaller. - View Dependent Claims (19, 20)
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Specification