Motorola Corporation

Georgina More

George Thomas

Jose M Fernandez

John Wendell Oglesbee

Arthur G Burns

Scott M Garrett

A protection circuit ( ) and protection device ( ) for protecting a rechargeable (lithium-based) battery cell or cells from overcharging. A voltage regulator element ( ) is connected in parallel with the battery cell or cells ( ) and is thermally coupled to a thermal element ( ) connected in series with the charging current supply. The voltage regulator element ( ) prevents overcharging of the battery ( ) by shunting current away from the battery when a predetermined voltage across the battery is exceeded. Moreover, the thermal element ( ) prevents failure of the voltage regulator element ( ) by open circuiting the current path when the heat dissipated by the voltage regulator element ( ), thermally coupled to the thermal element ( ) causes the thermal element to enter a high resistance state. Additional protection may be provided by fuse bonds ( ) connecting the combination of the shunt voltage regulator and the thermal elements ( ) to the charging current supply and to the battery ( ).

Overcharge protection device and methods for lithium based rechargeable batteries

This invention includes a battery overprotection device comprising a thermal resistor, a zener diode, a pass element and a control circuit. The thermal resistor is used as an over-temperature limiting device, rather than an overcurrent device. By thermally coupling the thermal resistor to the zener diode, the thermal resistor protects the zener diode from &ldquo;burning up&rdquo; as a result of continuous power dissipation. When the zener is subjected to continuous power dissipation, its temperature rises. As the temperature rises, the thermal resistor's impedance increases, thereby reducing the power dissipation in the zener. The zener/thermal resistor combination serves as an auxiliary safety circuit for the transistor and control circuit.

Supplemental battery overcharge protection device

A device for powering electrical digital pulse discharge applications comprises one or more solar energy conversion modules and a load-leveling circuit that is comprised of at least one capacitor.

Solar hybrid electrical powering devices for pulse discharge applications

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 a capacitor, fuel cell, or flywheel. The second energy storage device 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 second energy storage device (14) to a load in response to changes in the battery (12).

Hybrid energy storage system

A hybrid 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 first and second energy storage devices may be coupled to output electronics to condition the output of the devices prior to delivering it to the application device.

A hybrid 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. The first and second energy storage devices are coupled to a current controller to assure that pulse transients are not applied to the battery cell as a result of charging the capacitor.

Energy storage system

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).

A battery (10) integrally formed in a substrate (2) comprises a first current collector (4) inlaid in the substrate (2) and further coupled to a first electrode (14), a second current collector (6) coupled to a second electrode (16), and a solid state electrolyte (8) between the first electrode (14) and the second electrode (16).

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Duluth, GA, United States of America

Georgina More