✍ Scribed by Dennis A. Corrigan
No coin nor oath required. For personal study only.
In the development of non-sintered nickel oxide electrodes for Ni-Zn electric vehicle (EV) batteries, maintaining adequate power performance was of particular concern. In the systems studied, the power output was limited by the nickel oxide electrodes. Simple pulse power tests were useful in characterizing the power performance in such cells. Although the cell impedance was not a simple resistance, the effective impedance at the end of a high rate discharge pulse had a resistive nature. This simplified the test procedures so that an accurate estimate of peak power could be obtained from one measurement. Measurements of the dependence on state of charge showed that the power output at 50% depth of discharge was representative of the power capability available during discharge.
A method was devised to project power performance expected in a Ni-Zn cell from Ni-Cd cell tests. This was useful in testing the durability of nickel oxide electrodes free from complications due to the degradation of zinc electrodes.
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