SYSTEM AND METHOD FOR SENSING BATTERY CAPACITY
First Claim
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1. A battery sense system comprising:
- a temperature sensor configured to measure a temperature of a battery;
a memory configured to store predetermined data associated with steady-state and transient behaviors of the battery relative to a depth of discharge (DOD) of the battery; and
a controller configured to measure a voltage of the battery and to calculate a state of charge (SOC) of the battery based on the voltage, the predetermined data, and the temperature.
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Abstract
One embodiment of the invention includes a battery sense system. The system includes a temperature sensor configured to measure a temperature of a battery and a memory configured to store predetermined data associated with steady-state and transient behaviors of the battery relative to a depth of discharge (DOD) of the battery. The system also includes a controller configured to measure a voltage of the battery and to calculate a state of charge (SOC) of the battery based on the voltage, the predetermined data, and the temperature.
36 Citations
20 Claims
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1. A battery sense system comprising:
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a temperature sensor configured to measure a temperature of a battery; a memory configured to store predetermined data associated with steady-state and transient behaviors of the battery relative to a depth of discharge (DOD) of the battery; and a controller configured to measure a voltage of the battery and to calculate a state of charge (SOC) of the battery based on the voltage, the predetermined data, and the temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for calculating a state of charge (SOC) of a battery, the method comprising:
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modeling the battery as a dynamic battery model comprising a steady-state circuit portion and a transient circuit portion to determine predetermined data associated with steady-state and transient behaviors of the battery relative to a depth of discharge (DOD) of the battery; determining a temperature of the battery; measuring a voltage of the battery; accessing the predetermined data from a memory; and calculating the SOC of the battery based on the voltage, the predetermined data, and the temperature. - View Dependent Claims (13, 14, 15, 16)
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17. A battery sense system comprising:
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a temperature sensor configured to measure a temperature of a battery; a memory configured to store predetermined data associated with steady-state and transient behaviors of the battery relative to a depth of discharge (DOD) of the battery; and a controller configured to obtain samples of a voltage of the battery at each of a plurality of sampling intervals, to estimate a corresponding current generated by the battery at a given sampling interval based on the voltage at a respective one of the sampling intervals, the predetermined data, and the temperature, and to calculate a state of charge (SOC) of the battery based on based on the estimated current through the battery at the respective one of the sampling intervals and based on the DOD of the battery at an immediately preceding sampling interval. - View Dependent Claims (18, 19, 20)
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Specification