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Battery management system and method of estimating battery state of charge

  • US 8,963,506 B2
  • Filed: 09/22/2011
  • Issued: 02/24/2015
  • Est. Priority Date: 10/13/2010
  • Status: Expired due to Fees
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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