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Apparatus of SOC estimation during plug-in charge mode

  • US 9,354,277 B2
  • Filed: 10/29/2010
  • Issued: 05/31/2016
  • Est. Priority Date: 10/29/2010
  • Status: Active Grant
First Claim
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1. A method for estimating parameters of a rechargeable energy storage system during a plug-in charge mode, said method comprising:

  • reading a first measured voltage and a measured current from the rechargeable energy storage system while charging the rechargeable energy storage system during a plug-in charge mode;

    interrupting the charge to stop current flow to the rechargeable energy storage system for a predetermined period of time;

    reading a second measured voltage during the charge interrupt;

    calculating a resistance based on the first measured voltage, the second measured voltage and the measured current;

    calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, and the measured current;

    calculating a residual voltage to compensate for an offset due to a limited period of rest relating to the predetermined period of time;

    calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and

    determining the state-of-charge for the rechargeable energy storage system using the open circuit voltage.

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