Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique

Toshiro HIRAI

Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique

Toshiro HIRAI

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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.

Publication: IEICE TRANSACTIONS on Communications Vol.E87-B No.4 pp.984-989

Publication Date: 2004/04/01

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Category: Energy in Electronics Communications

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Toshiro HIRAI, "Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique" in IEICE TRANSACTIONS on Communications, vol. E87-B, no. 4, pp. 984-989, April 2004, doi: .
Abstract: 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.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e87-b_4_984/_p

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@ARTICLE{e87-b_4_984,
author={Toshiro HIRAI, },
journal={IEICE TRANSACTIONS on Communications},
title={Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique},
year={2004},
volume={E87-B},
number={4},
pages={984-989},
abstract={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.},
keywords={},
doi={},
ISSN={},
month={April},}

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TY - JOUR
TI - Estimation of Degradation of Nickel-Cadmium Batteries for Cordless Telephones by a Discharge-Current-Pulse Technique
T2 - IEICE TRANSACTIONS on Communications
SP - 984
EP - 989
AU - Toshiro HIRAI
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E87-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2004
AB - 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.
ER -