Autonomous battery cell balancing system with integrated...

Details Autonomous battery cell balancing system with integrated... Autonomous battery cell balancing system with integrated...

2005-03-29

2005-03-29

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

Reexamination Certificate

active

06873134

ABSTRACT:
An autonomous lithium-ion cell balancing system with integrated voltage monitoring includes a lithium-ion battery having a plurality of cells, a cell balancing circuit and a cell balancing control circuit. The heart of the cell balancing circuit is a plurality of gated cell balancing converters that are connected with the battery cells and a common share bus. Each gated lithium-ion cell balancing converter receives and input drive voltage and an input sample voltage and transfers energy from highly charged lithium-ion cells to the less charged lithium-ion cells, forcing all cells to have the same energy level. Further, the gated cell balancing converter provides a telemetry output voltage analog to an input cell voltage, eliminating the need for a separate cell voltage monitor.

REFERENCES:
patent: 5578914 (1996-11-01), Morita
patent: 5631534 (1997-05-01), Lewis
patent: 6114835 (2000-09-01), Price
patent: 6121751 (2000-09-01), Merritt

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