Abstract: A method of driving a fuel cell system according to embodiments of the present invention includes supplying a first amount of oxidizer (which is less than a normal amount of oxidizer) to a fuel cell stack while continuously supplying fuel to the fuel cell stack, supplying a second amount of oxidizer (which is more than the normal amount) to the fuel cell stack, and supplying a third amount of oxidizer (which is the normal amount of oxidizer supplied in a normal driving state) to the fuel cell stack.

Abstract: A solid oxide fuel cell stack is disclosed. The solid oxide fuel cell stack may include a cell array, a pair of planar current collecting members, first and second terminal portions, and a pair of electric insulating members. A plurality of interconnector-type unit cells may be electrically connected in parallel to form a bundle, and a plurality of bundles may be electrically connected in series. The pair of the planar current collecting members may be electrically connected electrically to the plurality of bundles and configured to collect current. The first and second terminal portions contact the current collecting members. The pair of insulating members has first through-holes through which the first and second terminal portions pass, and to the insulating members are formed outside the pair of the current collecting members.

Abstract: A manifold device for a tube type solid oxide fuel cell including a manifold body including at least one of a first opening for fluid inflow and a second opening for fluid outflow; at least one of a first manifold unit in the manifold body, the first manifold unit distributing fluid flowing in the first opening portion into channels, and a second manifold unit in the manifold body, the second manifold unit integrating fluid flowing in channels out to the second opening; and a plurality of tube type ports, each tube type port having a tube type body contacting and protruding from an outer surface of the manifold body, being connected to and in fluid communication with the channels, and including a heat interception unit in a portion of the tube type body.

Abstract: A fuel cell stack includes a plurality of membrane electrode assemblies (MEAs) and a stamped metal separator. The metal separator is positioned between the membrane electrode assemblies. The separator includes at least one channel on both surfaces of the separator formed by a stamping process. The separator comprises a plurality of holes, each of which form a manifold communicating with each the channels.

Abstract: Disclosed are a fuel cell system, and a method of driving the system. The fuel cell system includes a fuel cell stack having a plurality of unit cells producing electricity, a switching unit connecting the plurality of unit cells to a discharge resistor, a switching controller synchronously operated when the voltage of the fuel cell stack reaches an open circuit voltage after power generation of the fuel cell stack is stopped. The switching controller generates select control signals to control the switching unit. The fuel cell system further includes a sensing unit measuring respective cell voltages of the plurality of unit cells and generating cell voltage sensing signals to control activation periods of the select control signals.

Abstract: A solid oxide fuel cell includes a plurality of unit cells; a plurality of first current collecting members, each of the first current collecting members extending between two of the unit cells; and a second current collecting member wound around an outer circumferential surface of each of the unit cells associated with one of the first current collecting members, wherein a length of each of the first current collecting members is longer than a distance between the unit cells from which the respective first current collecting member extends.

Abstract: A fuel cell system and a control method thereof are capable of preventing anode flooding due to a temperature difference between a stack and reformate upon starting a fuel cell system. The method of controlling a fuel cell system including steps of detecting a temperature of a fuel cell stack, detecting a temperature of reformate that is generated in a fuel reformer and then is supplied to the fuel cell stack through a heat exchanger, and setting the temperature of the reformate to be lower than the temperature of the fuel cell stack during a starting time of the fuel cell system.

Abstract: A fuel cell stack for generating electrical energy by an electrochemical reaction of a fuel and an oxidizing gas including a plurality of electricity generating units and a fastening member is disclosed. The plurality of electricity generating units are configured for an electrochemical reaction between the fuel and the oxidizing gas to generate electrical energy, and the fastening member combines the plurality of electricity generating units into a stack. Each electricity-generating unit includes a membrane electrode assembly (MEA) and separators that are provided on each side of the MEA. Each separator comprises a channel on a surface facing the MEA. The channel is divided into a multiple of 2 sub-channels that is greater than 2 on a surface of the separator, and the sub-channels have substantially the same fluid passage length.

Abstract: A fuel cell stack that includes: stacked cells that generate electricity; an exchange plate disposed at a first side of the stacked cells, having a channel in fluid communication with an injection flow path and a discharge flow path, which extend between the cells; and a pump that is disposed at an opposing second surface of the stacked cells, to force coolant (air) through the injection flow path, the exchange plate, and the discharge flow path.

Abstract: A solid oxide fuel cell. The solid oxide fuel cell includes a unit cell, which includes a first electrode layer, an electrolyte layer, and a second electrode layer that are sequentially laminated from an inner region to an outer region of the unit cell; and an interconnector electrically connected to the first electrode layer, exposed to outside of the unit cell, and electrically insulated from the second electrode. The solid oxide fuel cell further includes a first porous current collector on an outer surface of the second electrode layer; a first adhesive layer interposed between the first porous current collector and the second electrode layer; a second porous current collector on an outer surface of the interconnector; and a second adhesive layer interposed between the second porous current collector and the interconnector.

Abstract: A solid oxide fuel cell stack is disclosed. The solid oxide fuel cell stack may include a cell array, a pair of planar current collecting members, first and second terminal portions, and a pair of electric insulating members. A plurality of interconnector-type unit cells may be electrically connected in parallel to form a bundle, and a plurality of bundles may be electrically connected in series. The pair of the planar current collecting members may be electrically connected electrically to the plurality of bundles and configured to collect current. The first and second terminal portions contact the current collecting members. The pair of insulating members has first through-holes through which the first and second terminal portions pass, and to the insulating members are formed outside the pair of the current collecting members.

Abstract: A fuel cell stack and a manufacturing method thereof are disclosed. The fuel cell stack has at least one unit cell. The unit cell includes a first electrode collector, a first electrode layer formed on the first electrode collector, an electrolyte layer formed on the first electrode layer, a second electrode layer formed on the electrolyte layer, and a second electrode collector formed on the second electrode layer. At least one of the first and second electrode collectors may include a porous metal substrate having a density in a range from about 800 kg/m3 to about 1600 kg/m3 and a plurality of metal wires electrically connected to the porous metal substrate. The density of an electrode collector may be optimized to have an improved contact state between an electrode and the electrode collector. During operation, the fuel cell stack may thus have enhanced performance characteristics.

Abstract: A fuel cell including a plurality of tubular unit cells each including: a first electrode layer, an electrolyte layer, and a second electrode layer, stacked radially in a direction from a center axis to an outer region thereof; an internal current collector in an interior of the unit cell; and an external current collector arranged at an outer circumferential surface of the unit cell, the external current collector including a plurality of connecting portions configured to electrically connect between the unit cell and at least one another unit cell of the plurality of unit cells, and the connecting portions form two or more electrical paths between a unit cell of the plurality of unit cells and another unit cell of the plurality of unit cells.

Abstract: The present invention relates to a method of preparing a positive active material for a rechargeable lithium battery. The positive active material includes a lithium/nickel-based compound wherein primary particles having an average particle diameter ranging from 1 ?m to 4 ?m are agglomerated to form secondary particles. The positive active material of the present invention has excellent electrochemical performance and outstanding inhibition to swelling at high temperatures.

Abstract: A stack for a mixed oxidant fuel cell and a mixed oxidant fuel cell system including the stack. The stack includes at least one membrane-electrode assembly that includes a polymer electrolyte membrane, an anode and a cathode disposed on opposite sides of the polymer electrolyte membrane, and an electrode substrate disposed on at least one of the anode or the cathode; and an oxidant supply path and a fuel supply path that penetrate the membrane-electrode assembly. The oxidant supply path has both ends open, and the fuel supply path has one end open and the other end closed. The stack of the present invention can improve fuel cell efficiency by smoothly supplying a fuel and an oxidant. Particularly, since the stack is configured to supply the fuel and the oxidant without using a pump, it can make a fuel cell small and light.

Abstract: A fuel cell stack includes a plurality of unit cells, bypass resistors, and connective resistors. The unit cells are connected in series and/or in parallel. The connected resistors are disposed between the unit cells connected in series and disconnected by heat due to resistance at a small current value in comparison to an current collector. The bypass resistors are connected in parallel to the unit cells or the unit cells connected in parallel.

Abstract: A fuel cell stack including an electricity generating unit for generating electrical energy by electrochemically reacting a fuel and an oxidizing agent, the electricity generating unit including: a first separator; a second separator; a membrane electrode assembly (MEA) between the first separator and the second separator, each of the first and second separators including a channel on a surface facing the MEA and a manifold in the surface facing the MEA, the manifold communicating with the channel; and a gasket, positioned at an outer circumference portion of an area where the MEA is positioned, for sealing a space between the first and second separators and for covering an open area of a channel extension area of at least one of the first and second separators where the manifold communicates with the channel.

Abstract: Disclosed is a lithium secondary battery including a positive electrode comprising a combination of positive active materials. The combination includes a material represented by one or both of Formulae 1 and 2; and a material of Formula 3 as follows: LiaNibMncMdO2??(Formula 1) where 0.90?a?1.2; 0.5?b?0.9; 0<c<0.4; 0?d?0.2; LiaNibCocMndMeO2??(Formula 2) where 0.90?a?1.2, 0.5?b?0.9, 0<c<0.4, 0<d<0.4, and 0?e?0.2; LiaCoMbO2??(Formula 3) where 0.90?a?1.2 and 0?b?0.2; and each M of Formulae 1-3 is independently selected from the group consisting of Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Tl, Si, Ge, Sn, P, As, Sb, Bi, S, Se, Te, Po, and combinations.

Abstract: A manufactured fuel cell includes: a unit cell including a first electrode layer, an electrolyte layer surrounding an outer circumference of the first electrode layer, and a second electrode layer surrounding the electrolyte layer while exposing an end of the electrolyte layer; a plating layer around an outer circumference of the exposed electrolyte layer; a cell coupling member including a passage pipe inserted into the unit cell and forming a continuous passage from the inside of the unit cell, a coupling pipe provided outside of the passage pipe to form a space accommodating an end of the unit cell from the passage pipe, and a connecting unit connecting the coupling pipe with the passage pipe and restricting an insertion depth of the electrolyte layer and the first electrode layer; and a welding portion fixing and sealing the plating layer and an inner circumference of the coupling pipe with each other.

Abstract: A fuel cell module having a composite collector includes a hollow, cylindrical unit cell including a first electrode layer, an electrolyte layer, and a second electrode layer arranged in a radial direction of the hollow, cylindrical unit cell; a current collector including a metal material mesh or conducting line located on an outer circumference of the second electrode layer; and a plurality of auxiliary current collectors including ceramic material powders located on a surface of the current collector.