Storage battery condition tester utilizing low load current

Details Storage battery condition tester utilizing low load current Storage battery condition tester utilizing low load current

1985-06-04

1988-01-12

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324427, G01N 2746

Patent

active

047194286

ABSTRACT:
A condition tester for a storage battery that monitors the effect of internal battery resistance without drawing large currents. A switched load periodically draws a small current across the battery terminals. An AC voltage is produced at the battery terminals resulting from the oscillating current and the internal battery resistance. That small oscillating voltage is amplified, rectified and filtered to produce a DC voltage which depends upon the AC component. This DC voltage is subtracted from the nominal battery voltage and the difference is indicated by an appropriate meter. As the battery deteriorates its internal resistance increases causing the meter reading to decrease, thereby reflecting battery condition.

REFERENCES:
patent: 3753094 (1973-08-01), Furuishi et al.
patent: 3873911 (1975-03-01), Champlin
patent: 3909708 (1975-09-01), Champlin
patent: 4590430 (1986-05-01), Vandenbeaghe et al.
Willihnganz et al, "Battery Impedance", vol. 78, Electrical Engineering, 9/1959. pp. 922-925.

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