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Apparatus for controlling battery pack, and energy storage system including the apparatus

  • US 9,599,675 B2
  • Filed: 07/20/2012
  • Issued: 03/21/2017
  • Est. Priority Date: 12/06/2011
  • Status: Active Grant
First Claim
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1. An apparatus for controlling a battery pack which comprises at least one battery tray each comprising one or more battery cells, the apparatus comprising:

  • an open circuit voltage (OCV) calculator configured to receive OCV measurement values of the battery cells of each battery tray when the power of the battery pack is turned on, and calculate a final OCV of the battery cells based at least in part on the OCV measurement values; and

    a state of charge (SOC) estimator configured to extract an SOC value corresponding to the final OCV from an SOCwherein the SOC table contains SOC values with respect to the temperature of the battery cells and the SOC of the battery cells according to an OCV over time, andfurther comprising a sampler configured to select a predetermined number of battery cells from the total number of the battery cells,wherein the OCV calculator is configured to calculate an average of OCVs of the selected battery cells and multiply the calculated OCV average by the total number of the battery cells table and estimate the extracted SOC value as an initial SOC.

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