Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique(Energy in Electronics Communications)

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概要

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• We investigated the accuracy of nickel-cadmium (Ni/Cd) battery degradation estimation by measuring the capacity of over 400 used cordless-telephone batteries using a discharge-current-pulse technique. The capacity is calculated from the change in battery voltage after the current pulse is applied, using an equation that we developed. Battery degradation is represented by a percentage of the capacity based on the nominal one. To estimate the accuracy of the degradation estimation, we compare capacity Q_e estimated from the current pulse with the capacity Q_a measured by discharging the batteries. The Q_e estimated from the current pulse was within a range of ±20% of error indicated by (Q_e-Q_a) for 47% of the tested batteries. The Q_e of 51% of the batteries, however, was underestimated and exceeded lower limit (-20%) of the error. One reason for the discrepancy could be that the equation is inadequate for estimating the capacity from the current pulse. On the other hand, the capacity Q_e of 1% of the batteries was overestimated and exceeded upper limit (+20%) of the error. An internal short is probably the main reason for this.

• 一般社団法人電子情報通信学会の論文
• 2004-04-01

著者

• Hirai Toshiro

  Ntt Energy And Environment Systems Laboratories Ntt Corporation

関連論文

• Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique(Energy in Electronics Communications)

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