Energy storage device including a status indicator

1. An energy storage device for use with an electric vehicle, the energy storage device comprising:

an electrical energy storage device including at least one ultracapacitor configured to be coupled to an electrical traction system of the electric vehicle to provide electrical power to the electrical traction system;

a sensor integrally mounted within the electrical energy storage device and configured to measure a voltage of the ultracapacitor of the electrical energy storage device; and

a status indicator integrally mounted to the electrical energy storage device and configured to provide a visual indication of the voltage.

2. The energy storage device of claim 1 , wherein the electrical energy storage device includes positive and negative terminals configured to be coupled to the electrical traction system of the electric vehicle, and wherein the sensor is configured to measure the voltage across the positive and negative terminals.

3. The energy storage device of claim 1 , wherein the status indicator comprises a light emitting diode.

4. The energy storage device of claim 3 , wherein the electrical energy storage device is configured to intermittently illuminate the light emitting diode at a predetermined frequency when the voltage is greater than a predetermined threshold.

5. The energy storage device of claim 1 , wherein the status indicator includes a plurality of segments configured to be sequentially illuminated to visually indicate the voltage.

6. The energy storage device of claim 1 , wherein the status indicator comprises an alphanumeric display configured to visually indicate the voltage.

7. The energy storage device of claim 6 , wherein the alphanumeric display is one of a light emitting diode display and a liquid crystal display.

8. The energy storage device of claim 1 , wherein the sensor comprises a voltage converter.

9. A method of producing an energy storage device for use with an electric vehicle, the method comprising:

providing an electrical energy storage device including at least one ultracapacitor configured to be removably mounted to the electric vehicle and further configured to be coupled to an electrical system of the electric vehicle;

mounting a sensor to the electrical energy storage device configuring the sensor to measure a voltage of the ultracapacitor of the electrical energy storage device;

integrally mounting a status indicator to the electrical energy storage device; and

configuring the status indicator to provide a visual indication of the voltage.

10. The method of claim 9 , wherein mounting the sensor to the electrical energy storage device comprises integrally mounting the sensor.

11. The method of claim 9 , wherein configuring the sensor to measure the voltage comprises coupling the sensor to positive and negative terminals of the electrical energy storage device so that the sensor is configured to measure the voltage across the positive and negative terminals.

12. The method of claim 9 , wherein the mounting the status indicator comprises mounting a light emitting diode.

13. The method of claim 12 , further comprising configuring the electrical energy storage device to intermittently illuminate the light emitting diode at a predetermined frequency when the voltage is greater than a predetermined threshold.

14. The method of claim 9 , wherein mounting the status indicator comprises mounting a plurality of segments configured to be sequentially illuminated.

15. The method of claim 9 , wherein the mounting the status indicator comprises mounting an alphanumeric display.

16. The method of claim 9 , wherein mounting the sensor includes mounting a voltage converter.