Method and apparatus for monitoring the state of charge of a battery

  • US 5,488,300 A
  • Filed: 10/21/1994
  • Issued: 01/30/1996
  • Est. Priority Date: 10/21/1994
  • Status: Expired due to Fees
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First Claim
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1. A method of monitoring ion mobility in an electro-conductive fluid, which comprises the steps of:

  • immersing at least one pair of test electrodes at least partially in the electro-conductive fluid;

    generating a test signal having a pulsed waveform, the pulsed waveform of the test signal having an amplitude which remains constant for a predetermined time sufficient to ensure that ion mobility in the electro-conductive fluid has reached a steady state velocity;

    applying the test signal to the at least one pair of test electrodes to cause a current to flow through the test electrodes and the electro-conductive fluid; and

    sensing the current flow through the test electrodes and the electro-conductive fluid caused by the test signal, the sensed current being indicative of ion mobility in the electro-conductive fluid.

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