Method for rapid charge control in lithium batteries

Details Method for rapid charge control in lithium batteries Method for rapid charge control in lithium batteries

2005-02-22

2005-02-22

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With peak detection of current or voltage

Reexamination Certificate

active

06859014

ABSTRACT:
This invention includes a method for charging lithium-based batteries. Battery type is identified by a charger by way of a third terminal. For nickel-based cells, the third terminal is coupled to a thermistor for sensing temperature. For lithium-based cells, the third terminal is coupled to the rechargeable cell disposed within the battery pack. If a nickel cell is identified, the cell is charged by conventional means. If a lithium cell is identified, the charger applies a full current until any serial elements disposed between the battery pack terminals and the cell reach a high impedance state. The charger then reduces the charging current to a low level for a predetermined time. After this time has elapsed, the charger then reapplies a high current. If the voltage across the serial elements remains low, charging continues. However, if the voltage across the serial elements exceeds a predetermined threshold, the charger then decrements the current by a predetermined amount.

REFERENCES:
patent: 6124700 (2000-09-01), Nagai et al.
patent: 6373225 (2002-04-01), Haraguchi et al.
patent: 6492792 (2002-12-01), Johnson, Jr. et al.

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