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1
US20050214619A1
Publication/Patent Number: US20050214619A1
Publication date: 2005-09-29
Application number: 11/091,536
Filing date: 2005-03-28
Abstract: A fuel cell stack includes a plurality of unit cells each including a membrane electrode assembly and first and second metal separators sandwiching the membrane electrode assembly. The unit cells are stacked into a stack body, and the stack body is placed in a casing. Fluorocarbon resin sheets are provided between four sides of the stack body in parallel with the stacking direction of the stacked body and side plates of the casing, respectively. The fluorocarbon resin sheets fill gaps between stack body and inner surfaces of the casing. A fuel cell stack includes a plurality of unit cells each including a membrane electrode assembly and first and second metal separators sandwiching the membrane electrode assembly. The unit cells are stacked into a stack body, and the stack body is placed in a casing ...more ...less
2
US20050249996A1
Publication/Patent Number: US20050249996A1
Publication date: 2005-11-10
Application number: 10/841,613
Filing date: 2004-05-08
Inventor: Meacham, G.b.  
Assignee: Meacham, G.B.
Abstract: High temperature solid oxide fuel cells (SOFC) and fuel cell stacks incorporating metallic bipolar separators with integral edge seals are provided. The electrochemical cells include reactant manifolds and flow passages, and may have either cathode or anode supported structures. The bipolar separators are thin metallic sheets that minimize thermal expansion stress in the electrochemical cells. The tubular bead edge seals are formed as an integral part of the bipolar separator by a low-cost sheet metal stamping process. High temperature solid oxide fuel cells (SOFC) and fuel cell stacks incorporating metallic bipolar separators with integral edge seals are provided. The electrochemical cells include reactant manifolds and flow passages, and may have either cathode or anode supported structures ...more ...less
3
US20050249999A1
Publication/Patent Number: US20050249999A1
Publication date: 2005-11-10
Application number: 11/180,642
Filing date: 2005-07-14
Abstract: A press separator made of a stainless steel sheet, for providing excellent corrosion resistance and electric conductivity by a combination of a passive coating and a deposition of boride or boron carbide, restriction corrosion without separation or coming-off, by press forming, of depositions, and ensuring an extended service. A stainless steel sheet, containing 0.005-1.5 wt. %, of B and having deposited on the surface thereof at least one kind out of M23(C, B)6 type boron carbide, and M2B type and MB type borides, is press-formed in a corrugated shape having continuous irregularities, with angles of bent portions formed by bending or unbending by press forming being set at at least 15 degrees and an outward bending R-value at up to 1 mm. A press separator made of a stainless steel sheet, for providing excellent corrosion resistance and electric conductivity by a combination of a passive coating and a deposition of boride or boron carbide, restriction corrosion without separation or coming-off, by press forming ...more ...less
4
US20050221149A1
Publication/Patent Number: US20050221149A1
Publication date: 2005-10-06
Application number: 11/085,551
Filing date: 2005-03-22
Abstract: In a polymer electrolyte fuel cell stack, cooling water which is used to cool a cell and which flows through a cooling water emission manifold is made to flow into an end plate and into a practically sigmoidal contiguous stack end passage provided in an upper area of the end plate corresponding to a high-temperature area of the cell. The temperature of cooling water flowing from a cell at the stack end to the cooling water emission manifold is maintained constant by a flow rate control element. In a polymer electrolyte fuel cell stack, cooling water which is used to cool a cell and which flows through a cooling water emission manifold is made to flow into an end plate and into a practically sigmoidal contiguous stack end passage provided in an upper area of the end ...more ...less
5
US20050221150A1
Publication/Patent Number: US20050221150A1
Publication date: 2005-10-06
Application number: 10/503,589
Filing date: 2003-02-17
Inventor: Revol, Stephane  
Abstract: An alveolar structure and a method of manufacturing an alveolar structure. The alveolar structure includes at least one alveolar zone partially delimited by an associated leak tight surface. Each alveolar zone is formed of a plurality of metallic layers superimposed parallel to the associated leak tight surface, each metallic layer including a network of passages opening out on either side of the each metallic layer. The alveolar structure may find particular application to fuel cells and heat exchangers. An alveolar structure and a method of manufacturing an alveolar structure. The alveolar structure includes at least one alveolar zone partially delimited by an associated leak tight surface. Each alveolar zone is formed of a plurality of metallic layers superimposed parallel to ...more ...less
6
US20050221152A1
Publication/Patent Number: US20050221152A1
Publication date: 2005-10-06
Application number: 10/516,216
Filing date: 2003-06-18
Abstract: A flow field plate for a fuel cell or electrolyser comprises on at least one face an assembly of channels comprising one or more gas delivery channels, one or more gas removal channels, and a permeable wall separating same. The permeable wall may comprise a plurality of gas diffusion channels. A flow field plate for a fuel cell or electrolyser comprises on at least one face an assembly of channels comprising one or more gas delivery channels, one or more gas removal channels, and a permeable wall separating same. The permeable wall may comprise a plurality of gas ...more ...less
7
US20050221155A1
Publication/Patent Number: US20050221155A1
Publication date: 2005-10-06
Application number: 10/818,611
Filing date: 2004-04-06
Abstract: The fuel cell layer with a central axis includes a first and a second unit fuel cell, an oxidant plenum comprising an oxidant; and a fuel plenum comprises a fuel; and each unit fuel cell comprises: a first and second process layer; a first cavity and second cavity formed between the first and second process layer and a first process layer of an adjacent unit fuel cell; a first perimeter barrier disposed on the second process layer substantially surrounding the second cavity; a second perimeter barrier disposed on the first process layer substantially surrounding the first cavity forming a unit fuel cell comprising a front face and back face; the first cavity is in communication with the oxidant plenum; the second cavity is in communication with the fuel plenum; wherein at least one of the process layers transports ions between the first and second cavities. The fuel cell layer with a central axis includes a first and a second unit fuel cell, an oxidant plenum comprising an oxidant; and a fuel plenum comprises a fuel; and each unit fuel cell comprises: a first and second process layer; a first cavity and second cavity formed between ...more ...less
8
US20050221161A1
Publication/Patent Number: US20050221161A1
Publication date: 2005-10-06
Application number: 10/506,526
Filing date: 2003-02-27
Abstract: A solid oxide fuel cell is formed by arranging a fuel electrode layer and an air electrode layer on both surfaces of a solid electrolyte, respectively, a fuel electrode current collector and an air electrode current collector outside the fuel electrode layer and the air electrode layer, respectively, and separators (8) outside the fuel electrode current collector and the air electrode current collector. In the first embodiment, a fuel gas and an oxidant gas are supplied from the separators (8) to the fuel electrode layers and the oxidant electrode layers, respectively, through the fuel electrode current collectors and the air electrode current collectors, respectively. Each separator (8) is formed by laminating a plurality of thin metal plates at least including a thin metal plate (21) in which a first gas discharge opening (25) is arranged in the central part and second gas discharge openings (24) are circularly arranged in the peripheral part, and a thin metal plate (22) with an indented surface. The weight saving of the electric power generation cell can be achieved, and the gases discharged from the separators (8) can be supplied to the whole areas of the electrode layers through the current collectors, so that an efficient electric power generation satisfactory in gas utilization ratio can be carried out. In the second embodiment, indents (8a) are provided on the surface of each of the separators (8), which surface is in contact with one of the current collectors (6), to increase the dwell volume and hence the retaining time of the gas in the interior of the current collectors. Thus, the gases permeate the interior of the current collectors slowly and are spread over the whole area of the current collectors, so that a satisfactory gas reaction can be carried out over the whole area of the electrode layers. Thus, the reaction time between the electrode layers and the gases can be made longer to thereby improve the electricity generation performance of the solid oxide fuel cell. A solid oxide fuel cell is formed by arranging a fuel electrode layer and an air electrode layer on both surfaces of a solid electrolyte, respectively, a fuel electrode current collector and an air electrode current collector outside the fuel electrode layer and the air ...more ...less
9
US20050282055A1
Publication/Patent Number: US20050282055A1
Publication date: 2005-12-22
Application number: 11/005,912
Filing date: 2004-12-06
Inventor: Kim, Jeong  
Abstract: Disclosed herein is a carbon composite separator for a fuel cell. The carbon composite separator comprises a separator body, and a partition plate made of a highly conductive and gas-impermeable material and embedded in the separator body. The carbon composite separator can completely prevent an increase in gas permeability caused by improper raw materials or unsuitably selected production processes of a carbon composite material, or various defects contained within the separator body. Disclosed herein is a carbon composite separator for a fuel cell. The carbon composite separator comprises a separator body, and a partition plate made of a highly conductive and gas-impermeable material and embedded in the separator body. The carbon composite separator can ...more ...less
10
US20050164064A1
Publication/Patent Number: US20050164064A1
Publication date: 2005-07-28
Application number: 11/041,932
Filing date: 2005-01-26
Abstract: The present invention is a stacked fuel cell system which is formed by stacking a plurality of electricity generators, each electricity generator having a membrane-electrode assembly and a separator provided with the membrane-electrode assembly. The stack comprises an aligner which is disposed at least one portion of the separator and which couples and aligns the plurality of electricity generators. The present invention is a stacked fuel cell system which is formed by stacking a plurality of electricity generators, each electricity generator having a membrane-electrode assembly and a separator provided with the membrane-electrode assembly. The stack comprises an aligner ...more ...less
11
US20050164077A1
Publication/Patent Number: US20050164077A1
Publication date: 2005-07-28
Application number: 10/765,034
Filing date: 2004-01-28
Inventor: Bacon, Bruno  
Assignee: Bacon, Bruno
Abstract: The invention provides an apparatus for maintaining a stack of electrochemical cells in an electrochemical generator in a state of compression. The apparatus includes a spring plate and a pressure plate, the spring plate being characterized by a series of resilient lateral extensions acting as springs. The pressure plate is operative to cooperate with the spring plate for applying pressure to the stack of electrochemical cells. Also provided is an electrochemical generator comprising a stack of electrochemical cells positioned within an enclosure and an apparatus positioned within the enclosure for maintaining the stack of electrochemical cells in a state of compression. The invention provides an apparatus for maintaining a stack of electrochemical cells in an electrochemical generator in a state of compression. The apparatus includes a spring plate and a pressure plate, the spring plate being characterized by a series of resilient lateral ...more ...less
12
US20050266295A1
Publication/Patent Number: US20050266295A1
Publication date: 2005-12-01
Application number: 10/539,243
Filing date: 2003-12-19
Inventor: Takai, Yuichi  
Assignee: Takai, Yuichi
Abstract: Fuel cell separation, fuel cell device, and electronic applied device technical field are provided. A fuel cell separator capable of making a fuel cell device compact and reducing variations in air supply amount to generating cells. Oscillating fans as fluid oxidant supplying means are respectively provided at openings of channels. The oscillating fans are individually driven to respectively supply air into the channels. The oscillating fans are included in a separator body of a separator. As compared with the case that the oscillating fans are provided separately from a fuel cell body having the separator as a component, the limitation to layout of the fuel cell body and various units for effecting stable electric power generation in the fuel cell body can be reduced, and the fuel cell device can be reduced in size. Fuel cell separation, fuel cell device, and electronic applied device technical field are provided. A fuel cell separator capable of making a fuel cell device compact and reducing variations in air supply amount to generating cells. Oscillating fans as fluid oxidant supplying ...more ...less
13
US20050244700A1
Publication/Patent Number: US20050244700A1
Publication date: 2005-11-03
Application number: 10/837,936
Filing date: 2004-05-03
Abstract: A hybrid bipolar plate assembly comprises a metallic anode plate, a polymeric composite cathode plate, and a metal layer positioned between the metallic anode plate and the composite cathode plate. The metallic anode and composite cathode plates can further comprise an adhesive sealant applied around the outer perimeter to prevent leaking of coolant. The assembly can be incorporated into a device comprising a fuel cell. Further, the device can define structure defining a vehicle powered by the fuel cell. A hybrid bipolar plate assembly comprises a metallic anode plate, a polymeric composite cathode plate, and a metal layer positioned between the metallic anode plate and the composite cathode plate. The metallic anode and composite cathode plates can further comprise an adhesive ...more ...less
14
US20050181264A1
Publication/Patent Number: US20050181264A1
Publication date: 2005-08-18
Application number: 10/780,025
Filing date: 2004-02-17
Abstract: The present invention is directed to an electroconductive element within an electrochemical cell that improves water management. The electroconductive element comprises an impermeable electrically conductive element and a porous liquid distribution media disposed along a major surface of the conductive element. Preferably, the liquid distribution media is in direct contact and fluid communication with a fluid distribution layer disposed between the membrane electrode assembly (MEA) and the liquid distribution media, so that liquids are drawn from the MEA through the fluid distribution layer to and through the liquid distribution media. The liquid distribution media transports liquids away from the MEA in the fuel cell. Methods of fabricating and operating fuel cells and electroconductive elements according to the present invention are also contemplated. The present invention is directed to an electroconductive element within an electrochemical cell that improves water management. The electroconductive element comprises an impermeable electrically conductive element and a porous liquid distribution media disposed along a major ...more ...less
15
US20050181266A1
Publication/Patent Number: US20050181266A1
Publication date: 2005-08-18
Application number: 10/986,322
Filing date: 2004-11-04
Abstract: In a fuel cell assembly (1) comprising a pair of separators (11, 12) each for defining a recess (10) serving as a conduit for a fuel fluid or an oxidizer fluid, a feedthrough conductive path for connecting top and under surfaces of each separator is achieved by a second electroconductive film (36) formed on a side wall of a through-hole (33) extending through each separator (11, 12) in such a manner that the second electroconductive film (36) connects a first electroconductive film (35) constituting a top surface of a projection (30) provided in the recess (10) to a third electroconductive film (37) formed on a surface opposite to that formed with the recess (10). In a fuel cell assembly (1) comprising a pair of separators (11, 12) each for defining a recess (10) serving as a conduit for a fuel fluid or an oxidizer fluid, a feedthrough conductive path for connecting top and under surfaces of each separator is achieved by a second ...more ...less
16
US20050084735A1
Publication/Patent Number: US20050084735A1
Publication date: 2005-04-21
Application number: 10/687,010
Filing date: 2003-10-16
Inventor: Breault, Richard  
Abstract: The reactant gas manifolds (12-15) of a PEM fuel cell are modified to provide insulated manifolds (14a) having inner and outer walls (30, 31) closed off by a peripheral wall (35) to provide a chamber (36) which may be filled with a vacuum, a low thermal conductivity gas, a VIP (59) or a GFP (63). Single walled manifolds (14d, 14e) may have VIPs or GFPs inside or outside thereof. An insulation panel (40) similarly has inner and outer walls (42, 43) closed with a peripheral wall (45) so as to form a chamber (46) that may contain a vacuum, a low thermal conductivity gas, a VIP or a GFP. The tie rods 9a may be recessed 50 into the pressure plate 11a of the fuel cell stack to allow a flush surface for the insulation panel 40. The reactant gas manifolds (12-15) of a PEM fuel cell are modified to provide insulated manifolds (14a) having inner and outer walls (30, 31) closed off by a peripheral wall (35) to provide a chamber (36) which may be filled with a vacuum, a low thermal conductivity gas, a VIP ...more ...less