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Calculation method, calculation system, and calculation apparatus

  • US 9,213,070 B2
  • Filed: 05/29/2012
  • Issued: 12/15/2015
  • Est. Priority Date: 05/31/2011
  • Status: Active Grant
First Claim
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1. An estimation method for estimating deterioration degree of a battery comprising:

  • receiving current information and voltage information at a processor, wherein the current information and voltage information are detected, while charging the battery, by current detector and a voltage detector, respectively installed in a battery apparatus;

    calculating with the processor an amount information of the battery indicating a charge amount based on the current information;

    calculating a first differential value by differentiating a residual sum of squares with respect to a capacity value of an electrode value of the battery, wherein the received current information, the received voltage information, and the calculated amount information are used to obtaining the residual sum of squares;

    calculating a second differential value by differentiating the residual sum of squares with respect to an internal resistance value of the battery;

    repeating the calculation of the first differential value and the second differential value until both of the first differential value and the second differential value satisfy a predetermined convergence condition;

    calculating a capacity of the electrode using the calculated first differential value and the calculated second differential value; and

    determining a deterioration degree of the battery by referring to deterioration references stored in a memory based on the calculated capacity and internal resistance.

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