WO2006039901A1 - Vorrichtung und verfahren zur bestimmung der leitfähigkeit eines kühlmediums eines brennstoffzellensystems - Google Patents
Vorrichtung und verfahren zur bestimmung der leitfähigkeit eines kühlmediums eines brennstoffzellensystems Download PDFInfo
- Publication number
- WO2006039901A1 WO2006039901A1 PCT/DE2005/001809 DE2005001809W WO2006039901A1 WO 2006039901 A1 WO2006039901 A1 WO 2006039901A1 DE 2005001809 W DE2005001809 W DE 2005001809W WO 2006039901 A1 WO2006039901 A1 WO 2006039901A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel cell
- cooling medium
- conductivity
- poles
- resistance measuring
- Prior art date
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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04029—Heat exchange using liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
-
- 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
- H01M8/04949—Electric variables other electric variables, e.g. resistance or impedance
-
- 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
- H01M8/04664—Failure or abnormal function
- H01M8/04679—Failure or abnormal function 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
- H01M8/04949—Electric variables other electric variables, e.g. resistance or impedance
- H01M8/04953—Electric variables other electric variables, e.g. resistance or impedance of auxiliary devices, e.g. batteries, capacitors
-
- 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
Definitions
- the invention relates to a device and a method for determining the conductivity of a cooling medium of a fuel cell system according to the preamble of patent claims 1 and 7.
- such a fuel cell system regularly comprises a fuel cell with electrical poles through which a cooling medium flows, the term fuel cell being used interchangeably below with the technical term fuel cell stack, which consists of a multiplicity of fuel cells arranged in succession.
- the system comprises an inverter electrically connected to said poles of the stack for converting the direct current generated by the fuel cell into alternating current.
- the parts of the fuel cell which are in communication with the cooling medium, and preferably also the inverters are regularly connected to the same ground electrical connection, ie. H. these are, for example, electrically connected to their metallic housings or frame parts on a common metallic housing.
- the efficiency of a fuel cell or a fuel cell stack depends inter alia on the conductivity of the cooling medium. If the conductivity of the cooling medium depends on the existing number of ions, the worst case scenario is a short circuit in the stack, because the functional principle of the fuel cell requires electrical separation of the differently polarized pole plates of the stack. This electrical separation is no longer guaranteed with high conductivity of the cooling medium, which indeed flows between the pole plates. During operation of a fuel cell system, it is thus necessary to pay attention to the conductivity of the cooling medium, since it either at least reduces the efficiency or, as explained, even leads to total failure of the stack.
- the electrical conductivity of the cooling medium is measured or checked, for example, once a day with a conductivity meter. For example, it should not exceed 5 ⁇ S / cm.
- the object of Er ⁇ invention is to determine the electrical conductivity of the cooling medium in a different, as simple as possible to be able to avoid a deteriorated operation or even a failure of the fuel cell system.
- a resistance measuring element for determining the conductivity of the cooling medium between the ground connection and one of the two poles of the fuel cell. Since a simple resistance measuring device is sufficient for the measurement of the resistance, which, in addition, does not have to be brought into contact with the cooling medium itself, the constructive and thus also the financial outlay is considerably reduced. Incidentally, since the measured resistance value is in reciprocal relation to the electrical conductivity, it can be determined or calculated directly from the resistance value.
- the proviso to use a resistance measuring element includes, moreover, both the possibility of using an ohmic resistance measuring device and a so-called impedance measuring device. The first device is used when the resistance is determined on the basis of an impressed direct current; the second device is accordingly considered when the resistance determination is based on an impressed alternating current, which of course is also possible.
- the device according to the invention for determining the conductivity of a cooling medium of a fuel cell system including its advantageous developments, is explained in more detail below with reference to the drawing of an exemplary embodiment.
- FIG 1 shows schematically an embodiment variant of the device according to the invention with fuel cell stack, inverter and resistance measuring element.
- the device according to the invention for determining the conductivity of a cooling medium of a fuel cell system is shown schematically.
- the device comprises a fuel cell 1 through which the cooling medium flows (here designed as a so-called PEM fuel cell stack) with electrical poles 2, 3 and an inverter 4 electrically connected to these poles 2, 3 for converting the direct current generated by the fuel cell 1 into alternating current ⁇ selstrom.
- parts of the fuel cell 1 or of the fuel cell system which are at least connected to the cooling medium and, preferably, the inverter 4 (dotted line) are connected to a same ground electrical connection 5.
- This can, as shown, be designed as a grounding or also (not shown) as a common housing of the fuel cell and preferably of the inverter.
- a resistance measuring element 6 is provided for determining the conductivity of the cooling medium between the ground connection 5 and one of the two poles 2, 3 of the fuel cell 1, or that the determination the conductivity of the cooling medium is effected by means of a provided between the ground terminal 5 and one of the two poles 2, 3 of the fuel cell 1 fuel cell resistance measuring element 6.
- the resistance measuring element 6 can optionally be designed as an ohmic resistance measuring device (for direct current) or as an impedance measuring device (for alternating current).
- resistance measuring elements are structurally much simpler than conductivity sensors to be provided on the device, especially according to an advantageous development in which the resistance measuring element 6 is designed as an integral component of the inverter 4; It should be noted in this regard that, of course, in this case as well, the resistance measuring element 6 is arranged between the ground terminal 5 and one of the two poles 2, 3 (in this case, the dotted connection is compelling), since the poles 2 3 are always electrically connected directly to the inverter 4.
- an electrically conductive liquid preferably deionized water, is used for this purpose. If the number of ions present in the water increases, the conductivity increases to a predefined conductivity threshold value. This is z. B.
- the conductivity measurement can, however, also be carried out by means of impedance measurement (with impressed alternating current) during operation.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004049127.5 | 2004-10-07 | ||
DE102004049127A DE102004049127B4 (de) | 2004-10-07 | 2004-10-07 | Vorrichtung und Verfahren zur Bestimmung der Leitfähigkeit eines Kühlmediums eines Brennstoffzellensystems |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006039901A1 true WO2006039901A1 (de) | 2006-04-20 |
Family
ID=35954030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2005/001809 WO2006039901A1 (de) | 2004-10-07 | 2005-10-07 | Vorrichtung und verfahren zur bestimmung der leitfähigkeit eines kühlmediums eines brennstoffzellensystems |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102004049127B4 (de) |
WO (1) | WO2006039901A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9203099B2 (en) | 2009-02-16 | 2015-12-01 | Siemens Aktiengesellschaft | Fuel cell assembly and method for operating a fuel cell assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015214956A1 (de) * | 2015-08-05 | 2017-02-09 | Volkswagen Ag | Brennstoffzellensystem sowie Fahrzeug mit einem solchen |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0992317A (ja) * | 1995-09-22 | 1997-04-04 | Fuji Electric Co Ltd | 燃料電池発電装置 |
EP1223631A2 (de) * | 2001-01-08 | 2002-07-17 | General Motors Corporation | Anordnung und Methode zur Bestimmung der elektrischen Leitfähigkeit von Kühlmittel in einem Brennstoffzellenstapel durch differentielle Spannungsmessung |
US20020164511A1 (en) * | 2001-04-12 | 2002-11-07 | Nissan Motor Co., Ltd. | Cooling device for fuel cell system and control method thereof |
US20020192521A1 (en) * | 2001-06-14 | 2002-12-19 | Stephen Raiser | Electrical isolation system for a fuel cell stack and method of operating a fuel cell stack |
US20030193009A1 (en) * | 2002-04-11 | 2003-10-16 | Dill Norman J. | Fuel cell stack coolant conductivity monitoring circuit |
US20040170877A1 (en) * | 2003-02-28 | 2004-09-02 | Nissan Motor Co., Ltd. | Fuel cell system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5933016A (en) * | 1996-08-30 | 1999-08-03 | The University Of Dayton | Single electrode conductivity technique |
-
2004
- 2004-10-07 DE DE102004049127A patent/DE102004049127B4/de not_active Expired - Fee Related
-
2005
- 2005-10-07 WO PCT/DE2005/001809 patent/WO2006039901A1/de active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0992317A (ja) * | 1995-09-22 | 1997-04-04 | Fuji Electric Co Ltd | 燃料電池発電装置 |
EP1223631A2 (de) * | 2001-01-08 | 2002-07-17 | General Motors Corporation | Anordnung und Methode zur Bestimmung der elektrischen Leitfähigkeit von Kühlmittel in einem Brennstoffzellenstapel durch differentielle Spannungsmessung |
US20020164511A1 (en) * | 2001-04-12 | 2002-11-07 | Nissan Motor Co., Ltd. | Cooling device for fuel cell system and control method thereof |
US20020192521A1 (en) * | 2001-06-14 | 2002-12-19 | Stephen Raiser | Electrical isolation system for a fuel cell stack and method of operating a fuel cell stack |
US20030193009A1 (en) * | 2002-04-11 | 2003-10-16 | Dill Norman J. | Fuel cell stack coolant conductivity monitoring circuit |
US20040170877A1 (en) * | 2003-02-28 | 2004-09-02 | Nissan Motor Co., Ltd. | Fuel cell system |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 08 29 August 1997 (1997-08-29) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9203099B2 (en) | 2009-02-16 | 2015-12-01 | Siemens Aktiengesellschaft | Fuel cell assembly and method for operating a fuel cell assembly |
Also Published As
Publication number | Publication date |
---|---|
DE102004049127B4 (de) | 2011-12-29 |
DE102004049127A1 (de) | 2006-04-13 |
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