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
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/02—Compacting only
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/12—Both compacting and sintering
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
  • B22F5/06—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of threaded articles, e.g. nuts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
  • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
• • 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
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0204—Non-porous and characterised by the material
  • H01M8/0206—Metals or alloys
• • 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
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0204—Non-porous and characterised by the material
  • H01M8/0206—Metals or alloys
  • H01M8/0208—Alloys
  • H01M8/021—Alloys based on iron
• • 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
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
  • H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
  • B22F2998/10—Processes characterised by the sequence of their steps
• • 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
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12201—Width or thickness variation or marginal cuts repeating longitudinally

Definitions

• the invention relates to a molded part with the features of the preamble of claim 1.
• such a molded part is known. It is designed, for example, as an interconnector or an end plate for a fuel cell stack. Such interconnectors or end plates have a function as a current collector and at the same time have a secure separation of
• interconnectors and end plates are formed as metallic plates or disks with nub and / or web-shaped elevations. These surveys are usually one-sided and at end plates
• Interconnectors executed on both opposite sides of the body.
• the raised structures are electrical contact areas towards the electrochemically active fuel cell.
• the spaces between the individual nub and / or web-shaped elevations serve to guide the reaction gases.
• the interconnector or the end plate must have a high
• the moldings can be made by powder metallurgy, powdered starting materials are pressed as possible into the final shape and then sintered.
• the geometrical design of the cross sections i.e., the interspaces between juxtaposed elevations
• rectangular cross sections would be optimal in themselves, as they are a good compromise in terms of maximum contacting area and sufficiently large at the same time
• flanks are in the powder metallurgical
• Manufacture usually by means of small transition radii on the one hand with a height in the outer end contour of the survey (corner radius) and the other with the surface contour of the body (curve radius), wherein a straight edge portion of the flank or lying at the point of transition of both transition radii the same edge tangent at an inclination angle is arranged to the ground plane of the base body.
• the invention is based on the object, the molding for a
• High-temperature fuel cell stacks solid oxide fuel cell or SOFC are used and often alloys with high chromium content as
• Different angles of inclination offer the possibility of geometrically adjusting the pressing tool for powder metallurgy production in such a way that improved removal of the compact from the pressing tool is achieved without disturbing frictional forces between the surfaces of the compact, in particular its elevations, and the pressing tool itself.
• Relative movements between the negative mold of the production tool and the molded part to be pressed remain advantageous in terms of production engineering without influencing the defined final geometry and mechanical integrity of the component, wherein the compactness and the compactness of the molded part are still provided to a sufficient extent.
• the different angles of inclination thus contribute to a particularly high-quality molded part.
• Elevations with different geometries can be defined individually in the row direction, depending on the production tool used, in particular pressing tool or press die. The number of errors
• the demolding between compact and pressing tool can in many
• Use cases are additionally improved if the angle of inclination of the second geometry is greater than the inclination angle of the first geometry.
• the first geometry is preferably represented by at least one of the following physical parameters and their values:
• the angle of inclination a1 lies in the range of 95 ° to 135 °,
• the radius of curvature R1, R1 ' is in the range of 0.15 to 1 mm
• the different geometries provided can also have different curve radii and / or different heights for one or more elevations.
• the corner curves between outer end contour of the survey and the side edge are equipped with a corner radius r.
• another way to provide different geometries is to define different corner radii r.
• the claims 3 to 5 suggest suitable angles of inclination, which additionally support the realization of the required density and homogeneity of the molded part. At relatively large angles of inclination, the survey has relatively flat side edges. The possibly conditional thereby
• Reduction of the channel cross section between two immediately adjacent elevations for gas guidance can be compensated by a correspondingly modified dimensioning of other parameters of the geometry, in particular the height and / or the corner radius and / or the radius of curvature.
• At least one elevation in cross-section is formed asymmetrically.
• At least 50%, in particular at least 70%, of the total number of aligned in the row direction elevations of a page of the basic body to a first geometry (claims 8 and 9).
• individual elevations with a second geometry may already be sufficient to reliably achieve a uniform pressing density for all elevations and at the same time to ensure good demoldability.
• the claims 10 and 11 suggest along the row direction a plurality of immediately adjacent elevations with the same geometry. As a result, the pressing tool can be targeted to different segments of the
• Body can be adjusted to disturbing influences during the
• the second geometry is realized on at least one elevation, which in an outer portion of the elevation row one side of the
• Disk cross-section in the ground plane of the body if the required high density with low density gradient is to be ensured, especially for longer survey rows in outer sections of the row direction.
• Claims 13 to 15 propose preferred measures and ranges for the formation of the geometry parameter height and radius of curvature.
• Components therefore maintain gas-guiding performance when the molded article is e.g. used in a fuel cell.
• Both the interconnector and the end plate are so-called current collectors.
• the interconnector is usually located between two cells of a cell stack, while the end plate is located at one end of the cell stack.
• At least one of the two main body sides (anode-side and / or cathode-side) of the molded part has a raised row with at least two different geometries.
• the electrochemical cell is in particular a solid electrolyte fuel cell - also known as SOFC (solid oxide fuel cell) - or a cell for electrolysis applications, in particular high-temperature electrolysis.
• SOFC solid oxide fuel cell
• FIG. 1 shows an enlarged scale, schematic and sectioned side view of a section of a previously known interconnector
• FIG. 1 shows schematically on an enlarged scale a section of an interconnector known from EP 2 337 130 A1 for a fuel cell stack in section.
• the interconnector has a plate-shaped main body 1 with elevations 2 on both opposite in the height direction 8 sides of the base body 1.
• the in section trapezoidal elevations 2 with the height h which is knob-shaped over the entire extension of the interconnector, can be continuously web-shaped, or segmented web-shaped, form through their channel-like spaces between each two immediately adjacent elevations 2, the channels for the gas flow of the interconnector.
• each elevation 2 passes over a corner rounding 4 or 4 'with a corner radius r or r' into inclined side flanks with a straight flank section 5 or 5 '.
• the straight sections 5 and 5 'then go into curved sections 6 and 6' with a radius of curvature R and R ', respectively.
• Interconnector according to FIG. 2 are on a first side 9 and at a in
• Height direction 8 opposite second side 10 of the base body 1 each have a plurality of elevations 2 arranged. They are in parallel to the ground plane of the main body 1 extending row direction 1 1
• Elevations 2 with a first geometry are arranged in a central portion 12 of the elevation row, while in a side facing away from the center of the elevation row outer portion 13 a plurality of elevations 2 are formed with a second geometry.
• two different geometries are realized on each side 9, 10 of the main body 1, wherein the first geometry on both sides 9, 10 and / or the second geometry on both sides 9, 10 do not have to be identical in each case.
• only one side 9 or 10 of the interconnector may have a second geometry in addition to the first geometry.
• reference numerals 4, 4 ', 5, 5', 6, 6 ', 7, 7' have been omitted from FIG. 1 merely for the sake of simplicity of illustration, even if the structural design of the elevations 2 according to FIG the features of these omitted reference numerals according to FIG. 1 or may have.
• the inclination angle a1 or ⁇ 1 'of the first geometry is 120 °.
• the inclination angle a2 or ⁇ 2 'of the second geometry in the outer portion 13 is 135 °.
• the two side edges 5 of the same elevation 2 preferably have in an outer portion 13 inclination angles a2 and ⁇ 2 ', which are different, in which case in particular the one facing the center of the elevation row or the central portion 12
• Inclination angle ⁇ 2 ' is smaller than the one end of the survey row or an outer portion 13 facing inclination angle a2.
• the outer end contours 3 of the elevations 2 are in both elevation rows each in a plane which parallel to the ground plane of the
• Base body 1 runs. At the same time, the height h1 of the projections 2 in the central portion 12 is smaller than the height h2 in the outer portion 13. In other words, the corresponding surface contours 7 of the
• Base body 1 in the region of the outer portion 13 on the one hand and in the region of the central portion 12 on the other hand arranged offset in the height direction 8.
• Molded parts were produced by powder metallurgy as interconnectors.
• Such formed interconnectors indicate a high degree
• FIG. 3 An example of a powder metallurgically produced interconnector Fig. 3 can be removed. The two different geometries of the elevations 2 in an outer portion 13 and a central portion 12 of the survey series are clearly visible.
• Powder mixture was added 1 wt .-% pressing aid (wax). Thereafter, this powder batch was mixed in a tumble mixer for 15 minutes. A pressing tool was with a punch corresponding to the
• Pre-sintered hydrogen atmosphere in a belt furnace for the purpose of dewaxing This was followed by high-temperature sintering of the component at 1400X for 7 hours under a hydrogen atmosphere for the purpose of further densification and alloying. This was followed by a pre-oxidation of the component at 950 ° C for a period of 10 to 30 hours to close any residual porosity so far that the permeability of the material is sufficiently low. Subsequently, the surfaces of the component were freed from the oxide layer by an all-round sandblasting process.
• Fig. 4 shows schematically on an enlarged scale the detail of an end plate according to the invention for a fuel cell stack in section.
• the elevations (2) are basically the same as in the interconnector according to FIG. 2, but in contrast to FIG. 3 only on one side 10 of FIG.
• Main body viewed in the height direction 8.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Fuel Cell (AREA)
• Powder Metallurgy (AREA)
• Food-Manufacturing Devices (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47048856

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (6)

Citations (2)

Family Cites Families (11)

• 2011
  • 2011-07-21 AT ATGM412/2011U patent/AT12696U1/de not_active IP Right Cessation
• 2012
  • 2012-07-18 IN IN191DEN2014 patent/IN2014DN00191A/en unknown
  • 2012-07-18 EP EP12755946.6A patent/EP2734323B1/de active Active
  • 2012-07-18 WO PCT/AT2012/000191 patent/WO2013010198A1/de not_active Ceased
  • 2012-07-18 US US14/234,037 patent/US9472816B2/en active Active
  • 2012-07-18 CN CN201280036180.8A patent/CN103917314B/zh active Active
  • 2012-07-18 KR KR1020147001366A patent/KR101880787B1/ko active Active
  • 2012-07-18 CA CA2842044A patent/CA2842044C/en active Active
  • 2012-07-18 DK DK12755946.6T patent/DK2734323T3/da active
  • 2012-07-18 JP JP2014520461A patent/JP6025842B2/ja active Active

Patent Citations (3)

Also Published As

Similar Documents

Legal Events