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A power supply ( 1 ) for a pulsed load ( 2 ) includes a first energy storage device in the form of a battery ( 3 ) which is in parallel with a second energy storage device in the form of a supercapacitor ( 4 ). Battery ( 3 ) and supercapacitor ( 4 ) are respectively modelled as: an ideal batt

A power supply ( 1 ) for a pulsed load ( 2 ) includes a first energy storage device in the form of a battery ( 3 ) which is in parallel with a second energy storage device in the form of a supercapacitor ( 4 ). Battery ( 3 ) and supercapacitor ( 4 ) are respectively modelled as: an ideal battery ( 7 ) in series with an internal resistance ( 8 ); and an ideal capacitor ( 9 ) in series with an equivalent series resistance (ESR) ( 10 ). Through use of a supercapacitor ( 4 ) having a low ESR with respect to the resistance ( 8 ), the power supply ( 1 ) facilitates continuity of supply to load ( 2 ). That is, during peak demand more of the load current will be supplied by supercapacitor ( 4 ) due to the lower ESR. Moreover, during times of lower load current demands the battery recharges the supercapacitor. This reduces the peak current needed to be provided by the battery and thereby improves battery longevity.

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1. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; anda supercapacitor connected in parallel with the terminals and having a pred

1. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; anda supercapacitor connected in parallel with the terminals and having a predetermined equivalent series resistance ESR, wherein ESR<0.25.R and a capacitance provided by the supercapacitor is sufficient to limit the battery current to a predetermined maximum. 2. A device according to claim 1 wherein ESR<0.1.R. 3. A device according to claim 1 wherein the supercapacitor provides a substantially constant current as the energy storage device discharges. 4. A device according to claim 1 including a housing for containing both the battery and the supercapacitor, the terminals being accessible from outside the housing for connecting to a load. 5. A power supply for a portable electronic device, the power supply including an energy storage device according to claim 1. 6. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery for providing a battery current and having two terminals for electrically connecting with a load; anda supercapacitor connected in parallel with the terminals and having a predetermined capacitance that, in use, independently limits the battery current to a predetermined threshold. 7. A power supply including:a battery having two terminals for electrically connecting with a load that demands a pulsed current; anda supercapacitor connected in parallel with the terminals wherein a capacitance of the supercapacitor is sufficient to maintain the ratio of the range of instantaneous power provided by the battery and the average value of the power provided by the battery at less than a predetermined threshold. 8. A power supply according to claim 7 wherein the predetermined threshold is one of the following: 1.5; 1; and 0.3. 9. An energy storage device including:a battery having two terminals for electrically connecting with a load that demands a pulsed current; anda supercapacitor connected in parallel with the terminals and having a capacitance sufficient to maintain the ratio of the range of instantaneous power provided by the battery and the average value of the power provided by the battery at less than a predetermined threshold. 10. An energy storage device according to claim 9 wherein the predetermined threshold is one of 1.5; 1; and 0.3. 11. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; anda supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermined equivalent resistance ESR and a capacitance C, wherein ESR<0.5R and C is less than 1 Farad. 12. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; anda supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermined equivalent series resistance ESR, wherein ESR<110 mOhms<R. 13. A device according to claim 12 wherein the ESR is less than about 50 mOhms. 14. A device according to claim 12 wherein the ESR is less than about 30 mOhms. 15. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; anda supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermi ned equivalent series resistance ESR, a predetermined volume V and a predetermined capacitance C, where ESR<0.5.R, V<13 cm 3 and C>1 Farad. 16. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having two terminals for allowing electrical connection to the battery; anda supercapacitor for independently limiting the battery current to a predetermined maximum, the supercapacitor having a plurality of serial connected supercapacitor cells for connecting in parallel with the terminals, wherein the supercapacitor cells have an operating voltage of at least 2.3 Volts and the supercapacitor has a predetermined equivalent series resistance ESR of less than about 20 mOhms. 17. A device according to claim 16 wherein ESR is less than about 15 mOhms. 18. An energy storage device for supplying a load with a pulsed load profile, the device including:a battery having two terminals for allowing electrical connection to the battery; anda supercapacitor for independently limiting the battery current to a predetermined maximum, the supercapacitor having a plurality of serial connected supercapacitor cells for connecting in parallel with the terminals, wherein the supercapacitor cells have an operating voltage of at least 2.3 Volts and the supercapacitor has a predetermined capacitance of greater than about 1.9 Farads.