STATE OF CHARGE INDICATORS FOR NICKEL CADMIUM BATTERIES

Abstract

THE VARIATIONS OF SEVERAL ELECTRICAL PROPERTIES OF NICKEL CADMIUM CELLS WITH STATE OF CHARGE WERE STUDIED TO DETERMINE THE SUITABILITY OF ANY OF THESE FOR MEASURING STATE OF CHARGE. Three methods were originally proposed: measurements of ohmic resistance, microsecond transients and double layer capacitance. During the investigations two additional parameters were measured, a. c. impedance and phase shift. Double layer capacitance and a.c. impedance and transient behavior are not useful properties for determining state of charge. A phase shift system is described which when properly calibrated predicted state of charge with an average deviation of = 10%. Ohmic resistance measured under correct conditions showed a closer correlation to state of charge but is difficult to measure.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1963
Accession Number
AD0406134

Entities

People

  • H.n. Seier
  • M. Lurie
  • R.c. Shair

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Amplifiers
  • Audio Frequency
  • Capacitance
  • Circuits
  • Connectors
  • Electrical Impedance
  • Electrical Properties
  • Electronic Switches
  • Impedance
  • Measurement
  • Phase Meters
  • Phase Shift
  • Resistance
  • Resonant Frequency
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Semiconductor Device Technology