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Differential current monitoring for parallel-connected batteries

  • US 9,678,163 B2
  • Filed: 01/17/2012
  • Issued: 06/13/2017
  • Est. Priority Date: 01/18/2011
  • Status: Active Grant
First Claim
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1. A system for determining battery internal short circuits based on inter-battery current monitoring, the system comprising:

  • a first battery;

    a second battery, the second battery being connected in parallel with the first battery; and

    an inter-battery current measurement module comprising at least one current measuring device, the inter-battery current measurement module being configured to;

    determine an inter-battery current associated with the first battery and the second battery, the inter-battery current comprising a transfer of charge between the first battery and the second battery; and

    detect an internal short circuit in the first battery based on the determined inter-battery current,determine an average value of the inter-batter current over a predetermined time period, anddetect the internal short circuit in the first battery based on the determined average value,wherein detecting the internal short circuit in the first batter based on the determined average value comprises detecting a shift in the magnitude in the average value of the inter-battery current during the predetermined time period.

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