On-board recharging system for battery powered electric vehicles

• US 5,332,630 A
• Filed: 11/04/1991
• Issued: 07/26/1994
• Est. Priority Date: 11/04/1991
• Status: Expired due to Term

• Current Assignee: Michael S. Hsu
• Original Assignee: Michael S. Hsu
• Inventors: Hsu, Michael S.
• Primary Examiner(s): KALAFUT, STEPHEN J
• Application Number:
  US07/787,218
• Time in Patent Office: 995 Days
• Field of Search: 429/20, 429/26, 180/65.3
• US Class Current: 429/432
• CPC Class Codes: B60L 58/31 for starting of fuel cells
• CPC Class Codes: B60L 58/33 by cooling
• CPC Class Codes: B60L 58/34 by heating
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: H01M 10/39 working at high temperature
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 2008/1293 Fuel cells with solid oxide electrolytes
• CPC Class Codes: H01M 2250/20 Fuel cells in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2300/0074 Ion conductive at high temperature
• CPC Class Codes: H01M 8/00 Fuel cells; Manufacture thereof
• CPC Class Codes: H01M 8/04007 related to heat exchange
• CPC Class Codes: H01M 8/04067 Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
• CPC Class Codes: H01M 8/04074 Heat exchange unit structures specially adapted for fuel cell
• CPC Class Codes: H01M 8/04365 of other components of a fuel cell or fuel cell stacks
• CPC Class Codes: H01M 8/04731 of other components of a fuel cell or fuel cell stacks
• CPC Class Codes: H01M 8/04768 of the coolant
• CPC Class Codes: H01M 8/04888 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/2425 High-temperature cells with solid electrolytes
• CPC Class Codes: H01M 8/2432 Grouping of unit cells of planar configuration
• CPC Class Codes: H01M 8/244 : with matrix-supported molten electrolyte
• CPC Class Codes: H01M 8/2483 : characterised by internal manifolds
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02E 60/50 : Fuel cells
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 90/40 : Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

A power supply system for powering an electric motor in an electric vehicle includes a rechargeable battery connected to the motor for driving the motor and a fuel cell assembly connected to the battery for recharging the battery. The system further includes structure for providing a supply of fuel to the fuel cell assembly which in turn converts the fuel to electricity.

Claims

1. A system for recharging a battery, the system comprising

a rechargeable battery,

a fuel cell system connected to the battery and adapted for providing power to continuously recharge the battery corresponding to a varying load placed on said battery,

means for controlling the temperature of said fuel cell system independently of the power output of said fuel cell system, and

means for providing a supply of fuel and oxidizer to said fuel cell system, said fuel cell system being adapted for the conversion of said fuel to electricity.

2. A system as set forth in claim 1, further comprising a voltage regulator for regulating the power supply to said rechargeable battery.

3. A system as set forth in claim 1, wherein said battery further comprises electrical leads to power an electric motor in an electric vehicle.

4. A system as set forth in claim 3, wherein said fuel cell system is adapted for selectively providing power directly to said electric motor.

5. A system as set forth in claim 1, wherein said fuel cell system comprises a stack of solid oxide fuel cells of operating temperature ranging from room temperature to 2000°

C.

6. A system as set forth in claim 1, wherein said fuel cell system comprises a stack of fuel cells selected from the group consisting of molten carbonate fuel cells, phosphoric acid fuel-cells, alkaline fuel cells, and proton electrolyte membrane fuel cells.

7. A system as set forth in claim 1, wherein the battery is a high temperature battery operating in the range between 50 and 500°

C.

8. A fuel cell assembly for converting fuel to electricity in response to a varying load, the assembly comprising

at least one fuel cell head comprising

a cooling jacket defining a fuel cell chamber,

a fuel cell stack arranged within said fuel cell chamber, and

a thermal control cylinder movable within said fuel cell chamber between a deployed position wherein said cylinder presents a high thermal resistance to said fuel cell stack and a stowed position wherein

said cylinder presents a low thermal resistance to said fuel cell stack, means for positioning said thermal control cylinder, and means for delivering a mixture of fuel and air to said fuel cell stack.

9. An assembly as set forth in claim 8, wherein said cooling jacket further defines a start-up preheating port for delivering heated gas to said fuel cell chamber.

10. An assembly as set forth in claim 8, further comprising a battery, wherein said at least one fuel cell head produces electricity for recharging the battery.

11. An assembly as set forth in claim 10, wherein said battery further comprises electrical leads for connection to an electric motor in an electric vehicle.

12. A system as set forth in claim 8, wherein said fuel cell assembly further comprises means for selectively providing power directly to an electric motor.

13. A power supply system for powering an electric motor in an electric vehicle, the system comprising

a rechargeable battery having an electrical power storage capacity and electrical leads for connection to a motor to deliver electrical power to the motor,

a fuel cell system connected to said battery for continuously supplying power to recharge said battery at a rate which is related to the energy drain of said battery, said fuel cell system adapted for selectively providing power off-board of the vehicle, and

means for providing a supply of fuel and oxidizer to said fuel cell system, said fuel cell system being adapted for the conversion of said fuel to electricity.

14. A fuel cell assembly for converting fuel to electricity in response to a varying load, the assembly comprising

at least one fuel cell assembly comprising

an interdigitated array of columnar fuel cell elements and columnar cooling elements, and

a fuel cell stack disposed within each of said fuel cell elements,

means for variably establishing a flow of heat transfer fluid through said cooling elements for presenting a variable thermal resistance to said fuel cell elements, and

means for delivering a supply of fuel and air to said fuel cell elements,

wherein said cooling elements are adapted for accommodating flow of both cooling fluid and heating fluid so as to enable said cooling elements to selectively remove heat from said fuel cell elements depending upon the load or provide heat to said fuel cell elements depending upon the load.

15. A fuel cell assembly for converting fuel to electricity in response to a varying load, the assembly comprising

at least one fuel cell assembly comprising

an interdigitated array of columnar fuel cell elements and columnar cooling elements, and

a fuel cell stack disposed within each of said fuel cell elements,

means for variably establishing a flow of heat transfer fluid through said cooling elements for presenting a variable thermal resistance to said fuel cell elements,

means for delivering a supply of fuel and air to said fuel cell elements, and

a battery element, wherein said at least one fuel cell head produces electricity for recharging said battery.

16. An assembly as set forth in claim 15, wherein said battery is utilized for powering an electric motor in an electric vehicle.

17. A system as set forth in claim 16, wherein said fuel cell system is adapted for selectively providing power directly to said electric motor.