Circuit and method for detecting battery source end of life

Details Circuit and method for detecting battery source end of life Circuit and method for detecting battery source end of life

1978-11-03

1981-03-31

Tokar, Michael J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324426, G01N 2742

Patent

active

042596394

ABSTRACT:
A circuit is disclosed for providing automatic detection of end of life of a battery source, particularly a lithium iodine type battery source characterized by a sharply increased internal resistance characteristic near end of life. The circuit periodically samples the short circuit output current of the source, the sampling being done at a high switching speed and for an extremely short time duration so that power consumption is minimized and only the resistive component which causes the knee in the resistance characteristic is measured. In the embodiment as incorporated in a cardiac pacer device, detection of the internal resistance knee is utilized to cause a step change in an operating characteristic of the pacer, such as stimulus rate, whereby end of life can be accurately monitored.

REFERENCES:
patent: 4031899 (1977-06-01), Renirie
J. Geard et al, A Determination of the Internal Resistance of Leclanche-type Cells, Proceedings of the 4th International Symp on Batteries, Sep. 1964, pp. 219-230.

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