Energy storage device for loads having variable power rates
First Claim
1. A power source for supplying electrical power to an electric driving motor suitable for driving and accelerating an electric vehicle, said electric driving motor drawing electrical power at different rates, the power source comprising:
- a first rechargeable energy battery having a first energy density for storing electrical energy;
a second rechargeable power battery having a second energy density, less than the first energy density, for storing electrical energy and providing electrical power to the electrical motor at the different rates;
a battery controller capable of controlling the substantially continuous recharging of the power battery with electrical energy from the energy battery; and
wherein electrical energy stored in the energy battery is supplied to the electrical driving motor through the power battery and at the different rates.
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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 is continuously recharged by the energy storage battery. In this way, the power battery temporarily stores electrical energy received from the energy battery and provides the 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
34 Claims
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1. A power source for supplying electrical power to an electric driving motor suitable for driving and accelerating an electric vehicle, said electric driving motor drawing electrical power at different rates, the power source comprising:
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a first rechargeable energy battery having a first energy density for storing electrical energy;
a second rechargeable power battery having a second energy density, less than the first energy density, for storing electrical energy and providing electrical power to the electrical motor at the different rates;
a battery controller capable of controlling the substantially continuous recharging of the power battery with electrical energy from the energy battery; and
wherein electrical energy stored in the energy battery is supplied to the electrical driving motor through the power battery and at the different rates. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An energy storage device for storing electrical energy to be delivered to an electrical load, said energy storage device comprising:
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a energy battery having a first energy density and electrically connectable to an external power source;
a power battery having a second energy density, less than the first energy density, said power battery being electrically connectable to the energy battery and electrically connectable to the load;
wherein, during operation, the power battery is connected to the load and supplies electrical energy to the load while the energy battery substantially continuously recharges the power battery; and
wherein the energy battery is periodically connected to the external source for recharging as required;
wherein the energy battery is selected from the group consisting of non-aqueous lithium-ion batteries, polymer lithium-ion batteries and sodium sulfur batteries. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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19. 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 energy density;
charging a rechargeable power battery having a second energy density, less than the first energy density;
supplying electrical energy from the power battery to the electrical load at the different rates;
recharging the power battery from the energy battery. - View Dependent Claims (18, 20, 21, 22, 23, 24)
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25. A rechargeable battery power supply system comprising:
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a rechargeable energy battery having an energy battery energy density and an energy battery voltage;
a rechargeable power battery having a power battery energy density and a power battery voltage, the power battery energy density being less than the energy battery energy density, and the energy battery voltage being greater than the power battery voltage;
a load structured to be driven by electrical energy;
first power supply circuitry structured and located to electrically connect the rechargeable power battery to the load so that the rechargeable power battery can supply electrical energy to the load through the first power supply circuitry; and
second power supply circuitry structured and located to electrically connect the rechargeable power battery to the rechargeable energy battery so that the rechargeable energy battery can supply electrical energy to the rechargeable power battery through the second power supply circuitry. - View Dependent Claims (26, 27, 28)
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29. A vehicle where the power used to drive the vehicle into motion comes at least partially from batteries, the vehicle comprising:
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a vehicle body;
an electric motor, in the vehicle body, structured to be driven by electrical energy and further structured to drive the vehicle into motion when the motor is driven by received electrical energy;
a rechargeable energy battery having an energy battery energy density and an energy battery voltage;
a rechargeable power battery having a power battery energy density and a power battery nominal voltage, the power battery energy density being less than the energy battery energy density, and the energy battery nominal voltage being greater than the power battery nominal voltage;
first power supply circuitry structured and located to electrically connect the rechargeable power battery to the electric motor so that the rechargeable power battery can supply electrical energy to the electric motor through the first power supply circuitry; and
second power supply circuitry structured and located to electrically connect the rechargeable power battery to the rechargeable energy battery so that the rechargeable energy battery can supply electrical energy to the rechargeable power battery through the second power supply circuitry. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification