Use of a mercury-column electrochemical coulometer is discussed as a means for indicating the state of charge of secondary-battery systems through ampere-hour integration. The general nonlinear charge-discharge characteristics of a battery were matched through the use of operational-amplifier techniques. Results of electrical and temperature tests demonstrate that a coulometer of this type is a feasible device around which a battery state-of-charge indicator might be built.The performance of the state- of- charge indicator was experimentally evaluated on both the subcircuit and overall circuit levels. The ability of the input circuit to compensate for the charge-discharge characteristics of a battery was checked by experimentally determining its transconductance ... The indicated linear portion is the selected operating range representing zero to full battery charge. That is, ananbsp;...
|Title||:||Mercury electrochemical coulometer as a battery state-of-charge indicator|
|Author||:||Richard R. Secunde, Arthur G. Birchenough, United States. National Aeronautics and Space Administration, Lewis Research Center|