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Performing active interrogation of battery packs in situ to obtain precise SOC and SOH estimates

  • US 10,180,460 B1
  • Filed: 01/20/2017
  • Issued: 01/15/2019
  • Est. Priority Date: 04/20/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • (a) controlling a plurality of Energy Storage Systems (ESSs) to supply power onto an electrical power bus and to receive power from the electrical power bus, wherein each of the ESSs is coupled to one of a plurality of switching power converters, and wherein each of the switching power converters is coupled to the electrical power bus;

    (b) generating a pre-determined signal using a first switching power converter, wherein charge flows from a first ESS onto the electrical power bus via the first switching power converter, wherein charge flows from the electrical power bus onto a second ESS via a second switching power converter, wherein current is sourced or sinked between the first and second ESSs, and wherein the pre-determined signal is masked from a load during (a) and (b);

    (c) measuring a response signal output by the first ESS as a result of generating the pre-determined signal in (b); and

    (d) determining a value indicative of a characteristic of the first ESS using the pre-determined signal and the response signal.

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