Suppressing HF cable oscillations during dynamic measurements of cells and batteries

  • US 9,851,411 B2
  • Filed: 03/12/2013
  • Issued: 12/26/2017
  • Est. Priority Date: 06/28/2012
  • Status: Active Grant
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First Claim
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1. Apparatus employing time-varying signals to test an electrochemical cell or battery comprising:

  • measuring circuitry containing current-excitation circuitry and voltage-sensing circuitry, said current-excitation circuitry adapted to couple to said cell or battery with an A-B conductor pair and said voltage-sensing circuitry adapted to couple to said cell or battery with a separate C-D conductor pair,a four-wire cable section connected to said measuring circuitry, said four-wire cable section comprising said A-B conductor pair and said C-D conductor pair bound together in close proximity to one-another within the same four-wire cable section, wherein A-B conductor pair and the C-D conductor pair of the four-wire cable section acts as a transmission line at high frequency and introduces an impedance mismatch between the four-wire cable section and the measurement circuitry,a spaced-apart cable section interconnecting said four-wire cable section with positive and negative terminals of said electrochemical cell or battery, wherein the A-B conductor pair and the C-D conductor pair in the spaced apart cable section acts as a transmission line at high frequency and introduces an impedance mismatch between the spaced apart cable section and said electrochemical cell or battery; and

    ,a bypass capacitor connected directly across said A-B conductor pair, said bypass capacitor suppressing high-frequency reflected waves oscillating on a two-wire transmission line comprising said A-B conductor pair due to said impedance mismatches.

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