Battery management system and method of estimating battery state of charge
First Claim
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1. A battery management system, comprising:
- a unit SOC calculator calculating a unit SOC using a charge/discharge current of a battery;
an electromotive force SOC calculator calculating an electromotive force SOC using an electromotive force of the battery;
a corrector calculating a compensation amount using the electromotive force SOC and a previous SOC; and
an SOC calculator calculating a current SOC by adding the unit SOC, the previous SOC, and the compensation amount, wherein the SOC calculator calculates the current SOC by;
SOCn+1=SOCn+SOCi+Kp(SOCv−
SOCn)+Kif(SOCv−
SOCn)dt where, SOCn+1 is the current SOC, SOCn is the previous SOC, SOCi is the unit SOC, SOCv is the electromotive force SOC, and Kp and Ki are constants).
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Abstract
A battery management system and method accurately estimate a state of charge (SOC) of a battery. For this, the battery management system may include a unit SOC calculator calculating a unit SOC by using a charge/discharge current of a battery, an electromotive force SOC calculator calculating an electromotive force SOC using an electromotive force of the battery; a corrector calculating a compensation amount using the electromotive force SOC and a previous SOC, and an SOC calculator calculating a current SOC using the unit SOC, the previous SOC, and the compensation amount.
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Citations
16 Claims
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1. A battery management system, comprising:
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a unit SOC calculator calculating a unit SOC using a charge/discharge current of a battery; an electromotive force SOC calculator calculating an electromotive force SOC using an electromotive force of the battery; a corrector calculating a compensation amount using the electromotive force SOC and a previous SOC; and an SOC calculator calculating a current SOC by adding the unit SOC, the previous SOC, and the compensation amount, wherein the SOC calculator calculates the current SOC by;
SOCn+1=SOCn+SOCi+Kp(SOCv−
SOCn)+Kif(SOCv−
SOCn)dtwhere, SOCn+1 is the current SOC, SOCn is the previous SOC, SOCi is the unit SOC, SOCv is the electromotive force SOC, and Kp and Ki are constants). - View Dependent Claims (2, 3)
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4. A battery management system, comprising:
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a unit SOC calculator calculating a unit SOC by using a charge/discharge current of a battery; an electromotive force SOC calculator calculating an electromotive force SOC using an electromotive force of the battery; an integration SOC calculator calculating an integration SOC by adding the unit SOC and a previous SOC; a corrector calculating a compensation amount by using the integration SOC, the electromotive force SOC, and the previous SOC; and an SOC calculator calculating a current SOC by adding the integration SOC and the compensation amount, wherein the SOC calculator calculates the current SOC by;
SOCn+1=SOCI+SOCi+Kp(SOCv−
SOCI)+Ki∫
(SOCv−
SOCI)dtwhere SOCn+1 is the current SOC, SOCI is the integration SOC, SOCv is the electromotive force SOC, and Kp and Ki are constants. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method for estimating a battery SOC using a battery management system, comprising:
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calculating a unit SOC by using a charge/discharge current of a battery; calculating an electromotive force SOC by using an electromotive force of the battery; calculating a compensation amount by using the electromotive force SOC and the previous SOC; and calculating a current SOC by adding the unit SOC, the previous SOC, and the compensation amount, wherein the calculation of the current SOC is performed based on;
SOCn+1=SOCn+SOCi+Kp(SOCv−
SOCn)+Ki∫
(SOCv−
SOCn)dtwhere SOCn+1 is the current SOC, SOCn is the previous SOC, SOCi is the unit SOC, SOCv is the electromotive force SOC, and Kp and Ki are constants.
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12. A method for estimating a battery SOC using a battery management system, comprising:
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calculating a unit SOC by using a charge/discharge current of a battery; calculating an electromotive force SOC by using an electromotive force of the battery; calculating an integration SOC by adding the unit SOC and the previous SOC; calculating a compensation amount by using the integration SOC, the electromotive force SOC, and the previous SOC; and calculating a current SOC by adding the integration SOC and the compensation amount, wherein calculating the current SOC is performed based on;
SOCn+1=SOCI+SOCi+Kp(SOCv−
SOCI)+Ki∫
(SOCv−
SOCI)dtwhere SOCn+1 is the current SOC, SOCI is the integration SOC, SOCv is the electromotive force SOC, and Kp and Ki are constants. - View Dependent Claims (13, 14, 15, 16)
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Specification