Abstract:
A modular DMFC array, and a related method of manufacturing such an array is provided. The modular DMFC array incorporates separately manufactured individual fuel cells that are connected after the manufacturing process. A locking mechanism incorporates the necessary electric connections. In one embodiment of the invention, the electrical connections also function as the locking mechanism. In such an embodiment, a separate mechanical fastening mechanism is not needed. In other embodiments of the invention, mechanical connections are provided to connect the individual fuel cells in the modular fuel cell array. Yet a further embodiment includes a carrier component on which the individual fuel cells are bonded. The electrical connections are provided either through the carrier component, or cell-to-cell.
Abstract:
A fuel cell (10) includes electrolyte electrode assemblies (26) and a pair of separators (28) sandwiching the electrolyte electrode assemblies (26). Each of the separators (28) includes a plurality of circular disks (36). First protrusions (48) and second protrusions (52) are provided on both surfaces of the circular disk (36). The first protrusions (48) contact an anode (24) of the electrolyte electrode assembly (26), and the second protrusions (52) contact a cathode (22) of the electrolyte electrode assembly (26). The area of the separators (28) is divided into portions corresponding to the respective electrolyte electrode assemblies (26). Each of the divided portions of the separators (28) forms a fuel gas flow field (46) and an oxygen-containing gas flow field (50) by sandwiching the electrolyte electrode assembly (26).
Abstract:
A stack (11) of fuel cells have water flow channels receiving water through a pump (33) from an accumulator (29) having double walls (63, 66) with vacuum insulation panels (VIPs) (65, 68) therebetween, auxiliary DC power source (80) (battery or supercapacitor) is disposed in a container (43) having double walls (81, 86) with VIPs (65, 68) encapsulated therebetween. A keep-warm heater (51) keeps the source warm enough for at least half power capacity, the source driving its own heater as well as a keep-warm heater (50) in the accumulator to keep the accumulator above freezing. A microwave heater (58) disposed in the accumulator distributes energy to melt ice using fuel cell stack power upon startup.
Abstract:
It is beneficial for a fuel cell test station to include an enclosure into which a fuel cell can be placed during testing operations. Existing fuel cell test stations typically have such an enclosure that is accessed through an arrangement of hinged doors or panels on one side of the enclosure. When a fuel cell is inside the enclosure and the doors are closed, an operator is shielded from the fuel cell under test, which protects the operator in the event of an unexpected and sudden discharge of process gases/fluids, fire or small explosion. The problem with current enclosure designs is that access to the inside of the enclosure is available only through one side of the enclosure via hinged doors or panels. According to some embodiments of the invention there is provided a test station that includes a movable shield that can be positioned to create an enclosure for a test area. The shield is movable between an open position, in which there is contiguous and unobstructed front and side access to the test area, and a closed position, in which the shield substantially cordons off the test area.
Abstract:
A first aspect of the invention relates to a portable electrical power supply comprising: a first housing (20) which contains at least one fuel cell (40); a second housing (10) containing power output means (56); and means (25) movably attaching said second housing to said first housing, said movement means permitting said second housing to be moved between a first position and a second position relative to the first housing; the arrangement being such that in said first position said at least one fuel cell is operable to produce electricity and said power output means is accessible to a user; and in said second position said at least one fuel cell is at least substantially deactivated. A second aspect of the invention relates to a portable electrical power supply comprising: a first housing (20) which contains at least one fuel cell (40), a second housing (10) containing power output means, and means (25) movably attaching said second housing to said first housing, said movement means permitting said second housing to be moved between a first position and a second position relative to the first housing; the arrangement being such that in said first position the output means is accessible to a user and said at least one fuel cell is operable to produce electricity, and in the second position the output means is inaccessible to a user.
Abstract:
A neutral buoyant airship, such as a blimp, contains a lifting body which allows the airship to remain neutrally buoyant in air and fuel cell located in the airship. A method of generating power in the neutrally buoyant airship, comprising providing a fuel and a oxidizer to a solid oxide fuel cell to generate power, and providing heat from the fuel cell to a remotely located lifting body, wherein the lifting body allows the airship to remain neutrally buoyant in air.
Abstract:
An enclosure for a fuel cell stack for insulating the hot zone of the fuel cell stack and for exchanging heat from the fuel cell stack to a reactant that passes through the enclosure to be used by the fuel cell stack. The enclosure comprises at least one chamber having an intake means for the reactant and an exhaust means for passing the reactant to the fuel cell stack. In one embodiment there are three layered chambers.
Abstract:
Assembling electrochemical cell components (11, 12, 13) using a bonding agent comprising aligning components of the electrochemical cell, applying a bonding agent between the components to bond the components together, placing the components within a container (15) that is essentially a pliable bag, and drawing a vacuum (16, 17, 18) within the bag, wherein the bag conforms to the shape of the components from the secure outside the bag, thereby holding t he components securely in place. The vacuum is passively maintained until the adhesive has cured and the components are securely bonded. The bonding agent used to bond the components of the electrochemical cell may be distributed to the bonding surface from distribution channels in the components. To prevent contamination with the bonding agent, some areas may be treated to produce regi ons of preferred adhesive distribution and protected regions. Treatments may include polishing, etching, coating and providing protective grooves between the bonding surfaces and the protected reive grooves between the bonding surfaces and the protected regions.
Abstract:
The invention relates to the field of alcohol-air fuel cells (FC) designed for use in portable radio-electronic equipment, such as cellular phones, notebooks, etc. In accordance with the invention a fuel cell FC comprises a housing with arranged therein a liquid catalytically active anode, an air catalytically active hydrophobic gas-diffusion cathode, a liquid alcohol-alkaline mixture filling the interior cavity of the housing and separating the anode and cathode, wherein the hydrophobic surface of the cathode faces air. The surface of the cathode facing the alcohol-alkaline mixture is coated with a layer of a polymer, for example polybenzimidazole, having conduction in respect to OH- ions. A non-platinum catalyst on the base of metals Fe, Ni, Co, Ru, that is tolerant in respect to alcohol, is used as the cathode catalyst. A 4M KOH + 4M alcohol mixture is used as the alcohol-alkaline mixture, and methanol, ethanol, propanol, butanol, ethylene glycol or glycerine is used as the alcohol in the alcohol-alkaline mixture. An Ni/Ru catalyst on a high surface area carbon carrier may be used as the anode catalyst, wherein Ni/Ru is present in the anode catalyst in the form of nanoparticles. An Ni/Ru catalyst obtained by the method of thermochemical synthesis on carbon black, electrodeposition, a chemical method, mechanical mixing may be used as the anode catalyst. Silver or pyropolymers of N4-complexes on a carbon carrier may be used as the cathode catalyst. The cathode catalyst may be mixed with polybenzimidazole.
Abstract:
A fuel cell unit includes a cassette holder for a ceramic fuel cell element sandwiched between interconnects of a novel design. The cassette holder isolates the cell from the surrounding interconnect by means of a pliant seal within a rigid frame, thereby reducing the possibility of breakage of the brittle cells. The cassettes are assembled between an upper and lower interconnect to isolate the upper face of the cell from the lower face of the cell. A fuel cell unit includes an upper and lower interconnect containing a cassette. A fuel cell stack is formed from a plurality of fuel cell units.