WO2005050765A3 - Dynamic fuel cell system management controller - Google Patents

Dynamic fuel cell system management controller Download PDF

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Publication number
WO2005050765A3
WO2005050765A3 PCT/US2004/041173 US2004041173W WO2005050765A3 WO 2005050765 A3 WO2005050765 A3 WO 2005050765A3 US 2004041173 W US2004041173 W US 2004041173W WO 2005050765 A3 WO2005050765 A3 WO 2005050765A3
Authority
WO
WIPO (PCT)
Prior art keywords
fuel cell
stack
cell system
voltage
tem
Prior art date
Application number
PCT/US2004/041173
Other languages
French (fr)
Other versions
WO2005050765A2 (en
Inventor
John Edward Lecky
Original Assignee
Miti Microfuel Cells Inc
John Edward Lecky
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miti Microfuel Cells Inc, John Edward Lecky filed Critical Miti Microfuel Cells Inc
Publication of WO2005050765A2 publication Critical patent/WO2005050765A2/en
Publication of WO2005050765A3 publication Critical patent/WO2005050765A3/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04589—Current of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04186—Arrangements for control of reactant parameters, e.g. pressure or concentration of liquid-charged or electrolyte-charged reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0444—Concentration; Density
    • H01M8/04447—Concentration; Density of anode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04552—Voltage of the individual fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04559—Voltage of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04597—Current of auxiliary devices, e.g. batteries, capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04791—Concentration; Density
    • H01M8/04798—Concentration; Density of fuel cell reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04865—Voltage
    • H01M8/04873—Voltage of the individual fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04865—Voltage
    • H01M8/0488—Voltage of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04895—Current
    • H01M8/0491—Current of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04925—Power, energy, capacity or load
    • H01M8/0494—Power, energy, capacity or load of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04246—Short circuiting means for defective fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/30—The power source being a fuel cell
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

A method and system for dynamically controlling and managing a fuel cell sys­tem is provided. The method and system ensures that predetermined operating parame­ters and conditions are met. This is achieved using programmable on-board hardware that is already available in the fuel cell system and does not require additional compo­nents. More specifically, operating characteristics are measured such as the voltage of the weakest cell, the stack output voltage, the stack output current, the current of a bat­tery being charged by the stack and/or the power of the stack. When each of these measurements is taken, a determination is made to find the load change that should be made in order to adjust the stack voltage to achieve a desired goal. In particular, the load on the fuel cell system can be varied by adjusting the duty cycle of the switches within a DC-DC converter that is being operated by an associated microcontroller. Measurements can also be used to measure methanol concentration and to predict opti­mal points at which a dosing of additional fuel should be delivered to the fuel cell sys­tem.
PCT/US2004/041173 2003-11-21 2004-11-19 Dynamic fuel cell system management controller WO2005050765A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/719,456 US7362073B2 (en) 2003-11-21 2003-11-21 Dynamic fuel cell system management controller
US10/719,456 2003-11-21

Publications (2)

Publication Number Publication Date
WO2005050765A2 WO2005050765A2 (en) 2005-06-02
WO2005050765A3 true WO2005050765A3 (en) 2006-06-08

Family

ID=34591327

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/041173 WO2005050765A2 (en) 2003-11-21 2004-11-19 Dynamic fuel cell system management controller

Country Status (2)

Country Link
US (1) US7362073B2 (en)
WO (1) WO2005050765A2 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2486179A1 (en) * 2002-05-16 2003-11-27 Ballard Power Systems Inc. Electric power plant with adjustable array of fuel cell systems
JP4529373B2 (en) 2003-04-28 2010-08-25 ソニー株式会社 FUEL CELL AND METHOD OF OPERATING FUEL CELL
US7419734B2 (en) * 2003-05-16 2008-09-02 Ballard Power Systems, Inc. Method and apparatus for fuel cell systems
US7270900B2 (en) 2003-11-03 2007-09-18 Mti Microfuel Cells, Inc. Automatic measurement of fuel cell resistance
US7038432B2 (en) * 2003-12-16 2006-05-02 Intersil Americas Inc. Linear predictive controller
US20050162122A1 (en) * 2004-01-22 2005-07-28 Dunn Glenn M. Fuel cell power and management system, and technique for controlling and/or operating same
US20050249989A1 (en) * 2004-05-07 2005-11-10 Pearson Martin T Apparatus and method for hybrid power module systems
US7521138B2 (en) * 2004-05-07 2009-04-21 Ballard Power Systems Inc. Apparatus and method for hybrid power module systems
JP4855743B2 (en) * 2004-09-30 2012-01-18 株式会社日立製作所 Power supply device using fuel cell and control method thereof
JP4979885B2 (en) * 2004-11-02 2012-07-18 パナソニック株式会社 Power supply
KR100722109B1 (en) * 2005-09-28 2007-05-25 삼성에스디아이 주식회사 Control device for fuel cell system and related method
EP2041854B1 (en) * 2005-10-19 2016-08-17 The Raymond Corporation Power source mounted on a lift truck
US20070139010A1 (en) * 2005-12-20 2007-06-21 General Electric Company Systems and methods for charging a battery
WO2007129594A1 (en) * 2006-05-09 2007-11-15 Aquafairy Corporation Charger
US7947400B2 (en) * 2006-08-14 2011-05-24 GM Global Technology Operations LLC Method of operating a fuel cell stack by monitoring membrane hydration
US7479777B2 (en) * 2006-12-28 2009-01-20 Intel Corporation Circuitry and method to measure a duty cycle of a clock signal
US8022663B2 (en) 2007-05-21 2011-09-20 Nmhg Oregon, Llc Energy recapture for an industrial vehicle
US8735012B2 (en) * 2008-11-20 2014-05-27 Mti Microfuel Cells Inc. Direct oxidation fuel cell system with uniform vapor delivery of fuel
WO2011162357A1 (en) * 2010-06-23 2011-12-29 株式会社マキタ Power supply device for power tool
US10892505B1 (en) 2016-08-26 2021-01-12 Hrl Laboratories, Llc Power management system utilizing metastable hydrogen carrier and method of operating the same
CN107845824B (en) * 2017-05-16 2023-04-07 西南交通大学 Control method and system for realizing optimal efficiency interval of fuel cell array
DE102020123932A1 (en) 2020-09-15 2022-03-17 Audi Aktiengesellschaft Method for determining the aging condition of at least one membrane electrode arrangement to be tested in a fuel cell stack
CN113884928B (en) * 2021-09-23 2022-06-21 西南交通大学 Multi-stack distributed control method based on fuel cell health degree correction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6428917B1 (en) * 1999-12-27 2002-08-06 Plug Power Inc. Regulating the maximum output current of a fuel cell stack
US6555989B1 (en) * 2001-11-27 2003-04-29 Ballard Power Systems Inc. Efficient load-following power generating system
US6590370B1 (en) * 2002-10-01 2003-07-08 Mti Microfuel Cells Inc. Switching DC-DC power converter and battery charger for use with direct oxidation fuel cell power source

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904548A (en) * 1987-08-03 1990-02-27 Fuji Electric Co., Ltd. Method for controlling a fuel cell
SU1610522A1 (en) 1988-09-15 1990-11-30 Предприятие П/Я Р-6788 System for monitoring and controlling fuel concentration in anolyte
JP3401886B2 (en) * 1993-12-13 2003-04-28 株式会社ニコン Power system using batteries
US5439756A (en) * 1994-02-28 1995-08-08 Motorola, Inc. Electrical energy storage device and method of charging and discharging same
US5585749A (en) * 1994-12-27 1996-12-17 Motorola, Inc. High current driver providing battery overload protection
US5587250A (en) * 1995-09-27 1996-12-24 Motorola, Inc. Hybrid energy storage system
US5736833A (en) * 1996-06-28 1998-04-07 Symbios Logic Inc. Rapid battery charging circuit with overvoltage shunt
US5670266A (en) * 1996-10-28 1997-09-23 Motorola, Inc. Hybrid energy storage system
US5916699A (en) * 1997-05-13 1999-06-29 Motorola, Inc. Hybrid energy storage system
US6087812A (en) * 1997-06-13 2000-07-11 Motorola, Inc. Independent dual-switch system for extending battery life under transient loads
US6214487B1 (en) * 1999-02-01 2001-04-10 Motorola, Inc. Integral sensors for monitoring a fuel cell membrane and methods of monitoring
US6423434B1 (en) * 1999-08-09 2002-07-23 Motorola, Inc. Method and apparatus for managing fuel cell performance
US6322917B1 (en) * 1999-09-27 2001-11-27 Plug Power L.L.C. Diagnostic method and control of preferential oxidation of carbon monoxide
US6583523B1 (en) * 2000-08-09 2003-06-24 Inverters Unlimited, Inc. Parallel DC power sources with different characteristics
US6580977B2 (en) * 2001-01-16 2003-06-17 Ford Global Technologies, Llc High efficiency fuel cell and battery for a hybrid powertrain
US6504339B2 (en) * 2001-02-08 2003-01-07 Plug Power Inc. Technique and apparatus to control the charging of a battery using a fuel cell
US6433522B1 (en) * 2001-05-02 2002-08-13 The Aerospace Corporation Fault tolerant maximum power tracking solar power system
DE60227510D1 (en) 2001-06-01 2008-08-21 Polyfuel Inc Replaceable fuel cartridge, fuel cell assembly with said fuel cartridge for portable electronic devices and related equipment
US6858335B2 (en) * 2001-11-14 2005-02-22 Relion, Inc. Fuel cell power systems and methods of operating fuel cell power systems
US20030175566A1 (en) * 2002-03-12 2003-09-18 Fisher John M. Fuel cell power systems and methods of operating fuel cell power systems
US20050048335A1 (en) * 2003-08-26 2005-03-03 Fields Robert E. Apparatus and method for regulating hybrid fuel cell power system output

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6428917B1 (en) * 1999-12-27 2002-08-06 Plug Power Inc. Regulating the maximum output current of a fuel cell stack
US6555989B1 (en) * 2001-11-27 2003-04-29 Ballard Power Systems Inc. Efficient load-following power generating system
US6590370B1 (en) * 2002-10-01 2003-07-08 Mti Microfuel Cells Inc. Switching DC-DC power converter and battery charger for use with direct oxidation fuel cell power source

Also Published As

Publication number Publication date
US7362073B2 (en) 2008-04-22
WO2005050765A2 (en) 2005-06-02
US20050110453A1 (en) 2005-05-26

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