BATTERY MANAGEMENT SYSTEM AND METHOD OF DRIVING THE SAME
First Claim
1. A method of driving a battery management system that estimates an internal impedance of a battery including a plurality of cells, the method comprising:
- generating a battery equivalent model of the battery;
receiving a terminal voltage signal and a charge and discharge current signal of the battery;
generating a first discrete signal corresponding to the terminal voltage signal of the battery;
generating a second discrete signal corresponding to the charge and discharge current signal of the battery; and
estimating the internal impedance of the battery by filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model.
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Abstract
A battery management system that estimates an internal impedance of a battery, a method of driving the same, a device that estimates an internal impedance of a battery, and a method of estimating the internal impedance of a battery. A method of driving a battery management system that estimates the internal impedance of a battery including a plurality of cells includes generating a battery equivalent model of the battery, receiving a terminal voltage signal and a charge and discharge current signal of the battery, and generating a first discrete signal corresponding to the terminal voltage signal of the battery and a second discrete signal corresponding to the charge and discharge current signal of the battery, and filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery. The device that estimates an internal impedance of a battery filters the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery.
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Citations
25 Claims
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1. A method of driving a battery management system that estimates an internal impedance of a battery including a plurality of cells, the method comprising:
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generating a battery equivalent model of the battery;
receiving a terminal voltage signal and a charge and discharge current signal of the battery;
generating a first discrete signal corresponding to the terminal voltage signal of the battery;
generating a second discrete signal corresponding to the charge and discharge current signal of the battery; and
estimating the internal impedance of the battery by filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery management system that estimates an internal impedance of a battery including a plurality of cells, the system comprising:
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an anti-aliasing low-pass filter that receives a battery terminal voltage signal and a battery terminal current signal and removes aliasing of the battery terminal voltage signal and the battery terminal current signal so as to generate a first signal and a second signal;
a continuous/discrete signal converter that converts the first signal and the second signal from the anti-aliasing low-pass filter into discrete signals according to a sampling time, and thereby generates a first discrete signal corresponding to the first signal and a second discrete signal corresponding to the second signal; and
an impedance estimating unit that estimates the internal impedance of the battery by filtering the first and the second discrete signals according to a frequency range corresponding to a battery equivalent model of the battery. - View Dependent Claims (11, 12, 13, 14)
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15. An impedance estimating device that estimates an internal impedance of a battery including a plurality of cells, the device comprising:
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a low-pass filter to filter a first discrete signal corresponding to a terminal voltage of the battery and a second discrete signal corresponding to a charge and discharge current of the battery, and thereby obtain a diffusion overvoltage, a charge transfer current, and an open circuit voltage of the battery; and
a high-pass filter to filter the first discrete signal and the second discrete signal and thereby obtain a resistance overvoltage and a resistance current of the battery. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for estimating an internal impedance of a battery, the method comprising:
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generating a battery equivalent model of the battery;
measuring a battery terminal voltage;
measuring a battery charge and discharge current when the battery is charged and discharged;
using the battery terminal voltage and the battery charge and discharge current to calculate the value of parameters of the battery equivalent model; and
estimating the internal impedance of the battery from the parameters of the battery equivalent model. - View Dependent Claims (23, 24, 25)
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Specification