Method and apparatus for detecting failed batteries

Electricity: measuring and testing – Electrolyte properties – Using a battery testing device

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324433, 340636, G01N 27416

Patent

active

060207434

ABSTRACT:
A technique for detecting failed batteries while the battery is attached to one or more electronic devices and is receiving a float charge is disclosed. The float voltage minimizes the normal voltage differences between battery cells. The technique employs a ratio comparative analysis of cell voltages of a battery provided across the terminals of the battery. Application of the ratio comparative analysis in assessing the condition of a battery assumes an equal voltage drop across each battery cell such that the cells are modeled as a series of resisters with respect to the float voltage. Such equal voltage drop enables a comparative ratio analysis of the voltage across each of the two portions of the battery's cell stack to the voltage across the entire battery. The comparative ratio analysis determines a voltage threshold that identifies whether a battery has a shorted or open cell.

REFERENCES:
patent: 4316185 (1982-02-01), Watrous et al.
patent: 5281920 (1994-01-01), Wurst
Article by: H. Schmidt & C. Siedle, "CHarge EQualizer: The Solution to an Old Battery Problem," Power Quality Assurance(Jul./Aug. 1993).

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