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METHOD AND SYSTEM FOR ESTIMATING STATE OF HEALTH OF BATTERY SET

  • US 20150168498A1
  • Filed: 12/16/2013
  • Published: 06/18/2015
  • Est. Priority Date: 12/16/2013
  • Status: Active Grant
First Claim
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1. A method for estimating a State of Health (SOH) of a battery set, comprising:

  • a measuring step, for repeatedly measuring a plurality of loop voltages of a plurality of battery cells of the battery set by a plurality of distinct discharge capacities of a predetermined sampling condition;

    a discretization step, for statistical-distributed-calculating the loop voltages of the battery cells according to a standard deviation formula, to get a plurality of voltage standard deviations, wherein each of the voltage standard deviations corresponding to each of the battery cells;

    a differential step, for getting a discrete curve according to the discharge capacities and the voltage standard deviations, to calculate a standard-deviation-trough-value of the discrete curve by using a differential formula; and

    an estimating step, for calculating a rated discharge capacity of the battery set and a discharge quantity corresponding to the standard-deviation-trough-value according to a SOH calculating formula, to get the SOH of the battery set.

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