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Title: Phase meter measurement of state of charge for satellite NiCd cells: a preliminary study. Interim report

Abstract

Experiments were performed to determine if the phase angle between alternating voltage and current could be used to predict, within a probable error of 5%, the state of charge of seven individual sealed (General Electric) model 10AB08 NiCd) cells and a battery consisting of the seven cells in series. The cells were charged for various lengths of time at 0.8 A to obtain a range of state of charge; their phase angles were measured with a Hewlett-Packard HP3575A gain-phase meter at 35 Hz; and they were discharged at 5 A 0.1 V to determine their state of charge in ampere-hours of capacity. The phase angle state-of-charge data were subjected to second-order polynomial curve fitting by means of least-squares analysis. The probable errors obtained from the least-squares analysis were used to judge the quality of the measured correlation between phase angle and state of charge. In order to determine how the correlation might be affected through cell use, the four extensively cycled cells with more than 3700 charge-discharge cycles and three cells with less than 40 such cycles were tested. The effect of temperature on the correlation was also studied.

Authors:
; ;
Publication Date:
Research Org.:
Aerospace Corp., El Segundo, CA (USA). Chemistry and Physics Lab.
OSTI Identifier:
6729078
Report Number(s):
AD-A-084907
DOE Contract Number:  
F04701-78-C-0079
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; ELECTRIC BATTERIES; BATTERY CHARGING; ALTERNATING CURRENT; DATA ACQUISITION; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; ELECTROLYTIC CELLS; ERRORS; LEAST SQUARE FIT; NICKEL-CADMIUM BATTERIES; POLYNOMIALS; PROBABILITY; CURRENTS; ELECTROCHEMICAL CELLS; FUNCTIONS; MAXIMUM-LIKELIHOOD FIT; METAL-METAL OXIDE BATTERIES; NUMERICAL SOLUTION; 250902* - Energy Storage- Batteries- Performance & Testing

Citation Formats

Martinelli, M R, Mayer, S W, and Badcock, C C. Phase meter measurement of state of charge for satellite NiCd cells: a preliminary study. Interim report. United States: N. p., 1979. Web.
Martinelli, M R, Mayer, S W, & Badcock, C C. Phase meter measurement of state of charge for satellite NiCd cells: a preliminary study. Interim report. United States.
Martinelli, M R, Mayer, S W, and Badcock, C C. Thu . "Phase meter measurement of state of charge for satellite NiCd cells: a preliminary study. Interim report". United States.
@article{osti_6729078,
title = {Phase meter measurement of state of charge for satellite NiCd cells: a preliminary study. Interim report},
author = {Martinelli, M R and Mayer, S W and Badcock, C C},
abstractNote = {Experiments were performed to determine if the phase angle between alternating voltage and current could be used to predict, within a probable error of 5%, the state of charge of seven individual sealed (General Electric) model 10AB08 NiCd) cells and a battery consisting of the seven cells in series. The cells were charged for various lengths of time at 0.8 A to obtain a range of state of charge; their phase angles were measured with a Hewlett-Packard HP3575A gain-phase meter at 35 Hz; and they were discharged at 5 A 0.1 V to determine their state of charge in ampere-hours of capacity. The phase angle state-of-charge data were subjected to second-order polynomial curve fitting by means of least-squares analysis. The probable errors obtained from the least-squares analysis were used to judge the quality of the measured correlation between phase angle and state of charge. In order to determine how the correlation might be affected through cell use, the four extensively cycled cells with more than 3700 charge-discharge cycles and three cells with less than 40 such cycles were tested. The effect of temperature on the correlation was also studied.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {8}
}

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