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Experimental Electrochemical Capacitor Test Results

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Abstract

Various electrochemical capacitors (ultracapacitors) are being developed for hybrid vehicles as candidate power assist devices for the Partnership for a New Generation of Vehicles (PNGV) fast-response engine. The envisioned primary functions of the ultracapacitor are to level the dynamic power loads on the primary propulsion device and recover available energy from regenerative breaking during off-peak power periods. This paper will present test data from selected U.S. Department of Energy (DOE) supported ultracapacitor projects designed to meet the fast response engine requirements.

This paper will address the temperature dependence of test data obtained from a set of three devices provided from Maxwell Energy Products, Inc. These devices are rated at 2300 F at 2.3 V. Constant-current, constant-power, and self-discharge testing as a function of temperature have been conducted. From these tests were determined the capacitance, equivalent series resistance, specific energy and power, and the self-discharge energy loss factor as a function of the device operating temperature.

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References

  1. Office of Transportation Technologies, Energy Efficiency and Renewable Energy, U.S. Department of Energy, Ultracapacitor Program Plan, (1994).

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  5. B. E. Conway and J. R. Miller, “Fundamentals and Applications of Electrochemical Capacitors,” manual for an Electrochemical Society Short Course, May 4, 1997, Chapter VIII.

  6. B. E. Conway, T-C Liu, and W. G. Pell, “Experimental Evaluation and Interpretation of Self-Discharge and Recovery Behavior of RuO2and Carbon Electrodes,” Proceedings of the 6th International Seminal on Double Layer Capacitors and Similar Energy Storage Devices, December 9-11, 1996, Volume 6.

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Acknowledgement

This work was supported by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy (EE), under DOE Idaho Operations Office Contract DEs-AC07s-94ID13223.

The authors would also like to thank Pat Smith of the INEEL for editorial and publication assistance.

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Authors and Affiliations

  1. Idaho National Engineering & Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID, 83415-3830, USA

    R. B. Wright & T. C. Murphy

  2. U.S. Department of Energy, Washington, D.C., 20585, USA

    Susan A. Rogers & Raymond A. Sutula

Authors
  1. R. B. Wright
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  2. T. C. Murphy
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  3. Susan A. Rogers
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  4. Raymond A. Sutula
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Correspondence to R. B. Wright.

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Wright, R.B., Murphy, T.C., Rogers, S.A. et al. Experimental Electrochemical Capacitor Test Results. MRS Online Proceedings Library 496, 661–668 (1997). https://doi.org/10.1557/PROC-496-661

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  • DOI: https://doi.org/10.1557/PROC-496-661

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