Battery charger and method of charging rechargeable batteries

Electricity: battery or capacitor charging or discharging – Battery or cell charging – With peak detection of current or voltage

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320161, H01M 740

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active

06043631&

ABSTRACT:
A method of charging a rechargeable battery which comprises charging the battery with a charging current; sampling a charging voltage of the battery during charging to recognize potential adverse conditions within the battery; interrupting the charging current periodically to create current-free periods and sampling an open circuit voltage of the battery at a plurality of points during each current-free period to identify potential overcharge conditions in the battery; lowering the charging current if any of the above-identified adverse conditions are identified and continuing charging with the charging current if the potential adverse charging condition is not identified; and terminating charging when a negative slope on a chemical polarization versus time curve is identified below a pre-determined minimum level. The battery charger and method of the present invention may also be utilized to determine the type, design, and chemistry of the battery being charged based on pre-determined chemical polarization values.

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Damon W. Chu, "Tradeoffs in Implementing Intelligent Battery Management", Jul. 10, 1995, 6 pgs.
David Freeman, "Freeing Portables from Battery Tyranny, " Jul. 10, 1995, 6 pgs.

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