Energy storage system with ultracapacitor and switched battery
First Claim
1. An energy storage system for a hybrid electric vehicle, wherein the vehicle includes a regenerative energy source generating regenerative pulses for charging the energy storage system, the energy storage system comprising:
- an ultracapacitor having a maximum operating voltage and a minimum operating voltage;
a battery having a maximum voltage that is greater than the ultracapacitor'"'"'s minimum operating voltage and substantially less than the ultracapacitor'"'"'s maximum operating voltage; and
a diode connected in series with the battery,wherein the ultracapacitor is electrically coupled in parallel with the series-connected battery and diode both when charging the ultracapacitor with regenerative pulses and when discharging the ultracapacitor in the absence of regenerative pulses, whereby the battery is generally shielded from high-current regenerative pulses.
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Accused Products
Abstract
An energy storage system for a vehicle includes an ultracapacitor that is electrically coupled in parallel with a battery through a diode connected in series with the battery. The ultracapacitor delivers the energy required for all high current surges that occur during engine start, acceleration, and regeneration. The battery is used only to assist with longer duration, high energy loads, such as accessory loads when an engine of the vehicle is not running. In other words, the battery conducts only during longer and less-frequent pulses and, therefore, does not have to withstand high-power pulses.
29 Citations
11 Claims
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1. An energy storage system for a hybrid electric vehicle, wherein the vehicle includes a regenerative energy source generating regenerative pulses for charging the energy storage system, the energy storage system comprising:
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an ultracapacitor having a maximum operating voltage and a minimum operating voltage; a battery having a maximum voltage that is greater than the ultracapacitor'"'"'s minimum operating voltage and substantially less than the ultracapacitor'"'"'s maximum operating voltage; and a diode connected in series with the battery, wherein the ultracapacitor is electrically coupled in parallel with the series-connected battery and diode both when charging the ultracapacitor with regenerative pulses and when discharging the ultracapacitor in the absence of regenerative pulses, whereby the battery is generally shielded from high-current regenerative pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification