Abstract
A nickel–metal hydride secondary battery is discharged intermittently through a switch of 30 s on/30 s off mode via an external load Rr. The discharge current ig is measured during switch-on and an open-circuit voltage Voc during switch-off. In the course of discharge run, ig drops at some time by depletion of an active material within the positive electrode. The pulse shapes of ig and Voc in each on/off duration are featureless before the ig drop, satisfying the relation Voc=ig(Ri+Rr) (Ri being the internal resistance of a battery). After the ig drop, they become time dependent; yet, the above relation still holds. It is found that Voc changes continuously through the onset times of switch-on and -off.
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