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Apparatus and method for estimating voltage of secondary battery including blended cathode material

  • US 9,207,287 B2
  • Filed: 08/22/2013
  • Issued: 12/08/2015
  • Est. Priority Date: 06/13/2012
  • Status: Active Grant
First Claim
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1. An apparatus for estimating a voltage of a secondary battery including first and second cathode materials, the apparatus comprising:

  • a voltage and current sensor unit configured to provide, when the secondary battery initiates charging or discharging, a measured operation initiating voltage of the second battery and, at time intervals during the charging or discharging of the secondary battery, a measured current of the secondary battery to the control unit; and

    a control unit configured to estimate the voltage of the secondary battery during charging or discharging of the secondary battery based on a circuit model of the secondary battery, the circuit model including;

    a first cathode material circuit modeled by adding a first open-circuit voltage according to a State of Charge (SOC) of the first cathode material and a first impedance voltage according to an impedance component of the first cathode material,a second cathode material circuit connected to the first cathode material circuit in parallel and modeled by adding a second open-circuit voltage according to an SOC of a second cathode material and a second impedance voltage according to an impedance component of the second cathode material, andan anode material circuit connected to the first and second cathode material circuits in series and modeled by adding a third open-circuit voltage according to an SOC of the anode material and a third impedance voltage according to an impedance component of the anode material,wherein the control unit estimates the voltage of the secondary battery during charging or discharging of the secondary battery based on the circuit model and by using the measured operation initiating voltage and the measured current of the secondary battery, and controls the charging or discharging of the secondary battery by using the estimated voltage of the secondary battery.

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