Hybrid energy storage system
AssigneeMotorola, Inc.
InventorsGeorge Thomas, Jose Maria Fernandez, Georgina More
Life of this patent
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Abstract
An energy storage system (10) including a first energy storage device (12), such as a secondary or rechargeable battery, and a second energy storage device (14), such as an electrochemical capacitor. The electrochemical capacitor provides intermittent energy bursts to satisfy the power requires of, for example, pulsed power communication devices. Such devices typically require power pulses in excess of those which conventional battery cells can easily provide for numerous cycles. The system (10) further includes circuitry (16) for coupling the capacitor (14) to a load in response to changes in the battery (12).
Claims20
An energy storage system comprising:
- a first energy storage device consisting of a battery having an impedance for providing a substantially constant power output;
- a second energy storage device consisting of a high power electrochemical capacitor device for providing intermittent bursts of high voltage output;
- and
- a controller responsive to changes in battery impedance, and controlling a switch for electrically coupling said capacitor to a load.
An energy storage system comprising:
- a first energy storage device consisting of a battery having an impedance for providing a substantially constant power output;
- a second energy storage device consisting of a high power electrochemical capacitor device for providing intermittent bursts of high voltage output;
- and
- circuitry responsive to changes in battery impedance, and controlling a switch for electrically coupling said capacitor to a load, said circuitry comprising a pair of resistors electrically coupled to a controller and said controller electrically coupled to said switch.
An energy storage system comprising:
- a first energy storage device consisting of a battery having an impedance for providing a substantially constant power output;
- a second energy storage device consisting of a high power electrochemical capacitor device for providing intermittent bursts of high voltage output;
- and
- circuitry responsive to changes in battery impedance due to temperature variations, and controlling a switch for electrically coupling said capacitor to a load, said circuitry comprising at least a resistor and a thermistor coupled to a controller, and said controller electrically coupled to said switch.
Dependencies are inferred from the claim text.