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;
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;
generating a third discrete signal by filtering the first discrete signal according to the frequency range corresponding to the battery equivalent model; and
generating a fourth discrete signal by filtering the second discrete signal according to the frequency range corresponding to the battery equivalent model,wherein the generating of the battery equivalent model comprises;
calculating a first parameter, which represents a resistance overvoltage corresponding to the internal impedance of the battery;
calculating a second parameter, which represents a charge transfer overvoltage;
calculating a third parameter, which represents a diffusion overvoltage; and
calculating a fourth parameter, which represents an open circuit voltage;
dividing the first to fourth parameters according to a frequency domain; and
the estimating of the internal impedance of the battery further comprises;
filtering the first parameter by using a high-pass filter,filtering the second parameter by using a band-pass filter, andfiltering the third and fourth parameters by using a low-pass filter.
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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
8 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; 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;
generating a third discrete signal by filtering the first discrete signal according to the frequency range corresponding to the battery equivalent model; and
generating a fourth discrete signal by filtering the second discrete signal according to the frequency range corresponding to the battery equivalent model,wherein the generating of the battery equivalent model comprises; calculating a first parameter, which represents a resistance overvoltage corresponding to the internal impedance of the battery; calculating a second parameter, which represents a charge transfer overvoltage; calculating a third parameter, which represents a diffusion overvoltage; and calculating a fourth parameter, which represents an open circuit voltage; dividing the first to fourth parameters according to a frequency domain; and
the estimating of the internal impedance of the battery further comprises;filtering the first parameter by using a high-pass filter, filtering the second parameter by using a band-pass filter, and filtering the third and fourth parameters by using a low-pass filter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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, wherein the impedance estimating unit further; generates a third discrete signal by filtering the first discrete signal and a fourth discrete signal by filtering the second discrete signal according to the frequency range corresponding to the battery equivalent model of the battery; estimates the internal impedance of the battery by using a third discrete signal and a fourth discrete signal, wherein the battery equivalent model includes four parameters, each of which corresponds to the internal impedance of the battery, the four parameters comprising; a first parameter, which represents resistance overvoltage; a second parameter, which represents a charge transfer overvoltage; a third parameter, which represents a diffusion overvoltage; and a fourth parameter, which represents an open circuit voltage; and wherein the impedance estimating unit; divides the four parameters according to a frequency domain; and filters the first parameter by using a high-pass filter; filters the second parameter by using a band-pass filter; and filters the third and the fourth parameters by using a low-pass filter. - View Dependent Claims (8)
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Specification