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Battery phase meter to determine internal temperatures of lithium-ion rechargeable cells under charge and discharge

  • US 8,961,004 B2
  • Filed: 10/18/2011
  • Issued: 02/24/2015
  • Est. Priority Date: 10/18/2010
  • Status: Active Grant
First Claim
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1. A method of measuring an internal temperature of a lithium-ion rechargeable cell, comprising:

  • applying an alternating signal to the cell to generate a phase-shifted alternating signal at the cell;

    detecting the phase shift as a phase difference between a frequency of the applied alternating signal and a frequency of the phase-shifted alternating signal; and

    determining the internal temperature of the cell based on the phase difference;

    wherein the applying includes one or more of applying an alternating current to generate a phase phase-shifted alternating voltage, and applying an alternating voltage to generate a phase phase-shifted alternating current.

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