Energy storage device for loads having variabl power rates
First Claim
1. A power source for supplying electrical power to a driving motor, said driving motor drawing electrical power at different rates, the power source comprising:
- a first rechargeable energy battery having a first total impedance for storing electrical energy and providing electrical power to the electrical motor at a first range of power rates;
a second rechargeable power battery having a second total impedance, less than the first total impedance, for storing electrical energy and providing electrical power to the electrical motor at a second range of power rates;
wherein the energy battery is directly connected in parallel with the power battery and the driving motor such that the electrical energy stored in the energy battery is provided to the driving motor in combination with electrical energy stored in the power battery; and
wherein the energy battery substantially continuously recharges the power battery with any excess power not provided to the driving motor.
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Accused Products
Abstract
An electrical energy storage device for storing electrical energy and supplying the electrical energy to a driving motor at different power levels is disclosed. The electrical storage device has an energy battery connected to a power battery. The energy battery has a higher energy density than the power battery. However, the power battery can provide electrical power to the electrical motor at different power rates, thereby ensuring that the motor has sufficient power and current when needed. The power battery can be recharged by the energy storage battery. In this way, the power battery temporarily stores electrical energy received from the energy battery and both batteries can provide electrical energy at the different power rates as required by the motor. The energy storage device can be releasably connected to an external power source in order to recharge both batteries. Both batteries can be recharged independently to optimize the recharging and lifetime characteristics of the batteries.
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Citations
20 Claims
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1. A power source for supplying electrical power to a driving motor, said driving motor drawing electrical power at different rates, the power source comprising:
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a first rechargeable energy battery having a first total impedance for storing electrical energy and providing electrical power to the electrical motor at a first range of power rates;
a second rechargeable power battery having a second total impedance, less than the first total impedance, for storing electrical energy and providing electrical power to the electrical motor at a second range of power rates;
wherein the energy battery is directly connected in parallel with the power battery and the driving motor such that the electrical energy stored in the energy battery is provided to the driving motor in combination with electrical energy stored in the power battery; and
wherein the energy battery substantially continuously recharges the power battery with any excess power not provided to the driving motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for storing electrical energy for an electrical load drawing electrical power at different rates, said method comprising:
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charging a rechargeable energy battery having a first total impedance;
charging a rechargeable power battery having a second total impedance, less than the first total impedance;
supplying electrical energy from the energy battery and the power battery to the electrical load, said rechargeable power battery, said rechargeable energy battery and said electrical load are connected to each other in parallel such that electrical energy stored in the energy battery is provided to the electrical load in combination with energy stored in the power battery when required by the electrical load, and, when not required by the electrical load electrical energy from the energy battery substantially recharges the power battery;
substantially continuously recharging the power battery from the energy battery with electrical energy not required by the electrical load. - View Dependent Claims (17, 18, 19, 20)
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Specification