Patents by Inventor Ho-Jin Kweon

Ho-Jin Kweon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • SMALL PORTABLE FUEL CELL AND MEMBRANE ELECTRODE ASSEMBLY USED THEREIN
    Publication number: 20080199758
    Abstract: A fuel cell includes: a fuel cell body; and a fuel supplier supplying fuel to the fuel cell body, wherein the fuel cell body includes: a membrane electrode assembly including an ion exchange membrane, an anode catalyst layer positioned at one surface of the ion exchange membrane, an anode gas diffusion layer positioned at one surface of the anode catalyst layer, and a cathode catalyst layer positioned at other surface of the ion exchange membrane; and a fuel flow field positioned at the one surface of the anode gas diffusion layer and supplying the fuel to the anode catalyst layer through the anode diffusion layer.
    Type: Application
    Filed: December 13, 2007
    Publication date: August 21, 2008
    Inventors: Seung-shik SHIN, Ho-jin KWEON, Mee-young LEE, Tae-keun KIM
  • Reformer for fuel cell system and method of manufacturing reaction substrate used for the same
    Patent number: 7407636
    Abstract: There is provided a reformer for a fuel cell system, the reformer comprising: a reforming unit having a reaction substrate in which a catalyst layer is formed in a plurality of flow channels for allowing fuel to flow and for generating hydrogen through a reformation reaction of the fuel using thermal energy. When viewing a cross-section perpendicular to the flow direction of the flow channels, the reaction substrate defines each flow channel by a bottom portion and a pair of wall portions extending from the sides of the bottom portion, and a joint between the bottom portion and the wall portion is formed in a rounded shape.
    Type: Grant
    Filed: May 7, 2005
    Date of Patent: August 5, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ju-Yong Kim, Ho-Jin Kweon, Jae-Jeong Kim, Oh-Joong Kwon
  • FUEL CELL SYSTEM AND CONTROL METHOD OF THE SAME
    Publication number: 20080171240
    Abstract: A fuel cell system and a method for controlling the same corrects concentration sensing values by estimating temperature according to the load amount of a stack. A control method of a fuel cell system including the steps of: measuring the load amount of loads supplied with power from a stack; estimating temperatures at the area where a concentration sensor is installed from the load amount values; producing the corrected concentrations by correcting the concentration sensing values according to the estimated temperatures; and controlling the drive of the fuel cell system according to the corrected concentrations.
    Type: Application
    Filed: January 11, 2008
    Publication date: July 17, 2008
    Inventors: Ri-a Ju, Jin-hong An, Dong-rak Kim, Hyun Kim, Ho-jin Kweon, Young-jae Kim
  • Hydrogen generator and fuel cell using the same
    Publication number: 20080166606
    Abstract: A hydrogen generator using a chemical hydride includes a reactor which stores an aqueous solution of chemical hydride, a catalyst which catalyzes the reaction of the aqueous solution of chemical hydride and water to generate hydrogen, a transferring device for transferring the catalyst into the aqueous solution of chemical hydride and after bring the catalyst into contact with the aqueous solution of chemical hydride within a predetermined time, separating them, and a temperature controller to maintain temperature of the aqueous solution of chemical hydride at a predetermined temperature.
    Type: Application
    Filed: January 9, 2008
    Publication date: July 10, 2008
    Inventors: Do-young Kim, Ho-jin Kweon, Won-hyouk Jang, Sung-jin Kim
  • Method for preparing poly(2,5-benzimidazole)
    Patent number: 7388035
    Abstract: A method for preparing poly(2,5-benzimidazole) whereby 3,4-diaminobenzoic acid is polymerized using a dehydrating reagent containing P2O5 and CX3SO3H where X is H or F. The poly(2,5-benzimidazole) has good proton conductivity and low methanol permeability, and therefore can be used as a polymer electrolyte membrane for a fuel cell.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: June 17, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Hyoung-Juhn Kim, Yeong-Chan Eun, Sung-Yong Cho, Ho-Jin Kweon
  • METHOD AND APPARATUS TO SENSE AND CONTROL A MALFUNCTION IN BALANCE OF PLANT FOR FUEL CELL
    Publication number: 20080131742
    Abstract: An apparatus to sense and control a malfunction in balance of plant for a fuel cell includes a microprocessor having an ALU to perform calculations, a register to temporally store data and instructions, and a controller to control the operation of the fuel cell system. The microprocessor includes a first input stage input with a first detecting signal to operate the fuel cell system, an output stage to apply a control signal generated by the controller to balance of plant, and a second input stage to receive a second detecting signal to detect a malfunction in balance of plant.
    Type: Application
    Filed: October 31, 2007
    Publication date: June 5, 2008
    Applicant: SAMSUNG SDI CO., LTD.
    Inventors: Jin-hong AN, Ho-jin Kweon, Ri-a Ju
  • MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL, METHOD OF PREPARING SAME, AND FUEL CELL SYSTEM INCLUDING THE SAME
    Publication number: 20080113256
    Abstract: The membrane-electrode assembly for a fuel cell includes an anode and a cathode facing each other and a polymer electrolyte membrane interposed therebetween. The cathode includes an electrode substrate and a catalyst layer disposed on the electrode substrate, and the catalyst layer has a mesopore volume ranging from 0.013 to 0.04 cm3/g. The membrane-electrode assembly has low mass resistance and contributes to the overall increased performance of the fuel cell by having optimal pore volumes (e.g., mesopore volume) in a cathode catalyst layer to provide ease of transfer and release of materials within the membrane-electrode assembly of the fuel cell.
    Type: Application
    Filed: November 6, 2007
    Publication date: May 15, 2008
    Inventors: Tatyana Reshetenko, Hee-Tak Kim, Ho-Jin Kweon
  • FUEL CELL SYSTEM FOR COMPUTING FUEL LEVEL
    Publication number: 20080107940
    Abstract: A fuel cell system capable of computing fuel level stored in a fuel tank, and more particularly to a fuel cell system capable of computing fuel level without using a flux sensor or flow rate sensor includes: a fuel tank storing fuel; a stack for generating electricity by the electro-chemical reaction of the fuel; a fuel pump for transferring fuel from the fuel tank to the stack; a fuel pump for transferring the fuel from the fuel tank to the stack; a pumping controller for generating a pump control signal controlling the pumping operation of the fuel pump; and a fuel level computing unit for computing the amount of fuel used and fuel level from the waveform of the pump control signal. In some embodiments, the fuel cell system informs a user when the fuel level is low, with reduced manufacturing costs.
    Type: Application
    Filed: November 2, 2007
    Publication date: May 8, 2008
    Inventors: Ri-a Ju, Dong-rak KIM, Jin-hong AN, Ho-jin KWEON, Sang-kyun KANG
  • Fuel cell system and stack used thereto
    Patent number: 7329472
    Abstract: Disclosed is a fuel cell system wherein the flow of fuel and oxygen is optimized thereby improving the thermal efficiency of the entire system. The fuel cell system comprises at least one stack for generating electrical energy by an electrochemical reaction between hydrogen gas and oxygen, a fuel supply portion for supplying fuel to the stack, and an oxygen supply portion for supplying oxygen to the stack. The stack is formed in a stacked configuration with MEAs and separators. The separators are positioned on either surface of the MEAs. The separators have a plurality of ribs proximate to the MEAs which define a plurality of channels wherein the ratio of a width of the channels to the width of the ribs is from about 0.8 to 1.5.
    Type: Grant
    Filed: February 10, 2005
    Date of Patent: February 12, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Dong-Hun Lee, Ho-Jin Kweon, Seong-Jin An, Hyoung-Juhn Kim, Jun-Won Suh, Jong-Man Kim, Hae-Kwon Yoon, Yeong-Chan Eun
  • Active material for lithium secondary battery and method of preparing active material
    Patent number: 7316865
    Abstract: A process of manufacturing a positive active material for a lithium secondary battery includes preparing a coating-element-containing organic suspension by adding a coating-element source to an organic solvent, adding water to the suspension to prepare a coating liquid, coating a positive active material with the coating liquid, and drying the coated positive active material.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: January 8, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ho-Jin Kweon, Jun-Won Suh
  • Positive active material for rechargeable lithium battery
    Patent number: 7309546
    Abstract: Disclosed is a positive active material for a rechargeable lithium battery, including a lithiated intercalation compound and an additive compound. The additive compound comprises one or more intercalation element-included oxides which have a charging voltage of 4.0 to 4.6V when 5-50% of total intercalation elements of the one or more intercalation element-included oxides are released during charging.
    Type: Grant
    Filed: October 3, 2002
    Date of Patent: December 18, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ho-Jin Kweon, Jun-Won Suh, Kyung-Ho Kim, Hee-Young Sun
  • INTEGRATED FUEL RECYCLING MODULE FOR USE IN FUEL CELL SYSTEM AND FUEL CELL SYSTEM USING THE SAME
    Publication number: 20070269689
    Abstract: Disclosed is a fuel feeder housing having a mixing tank and a carbon dioxide remover supporting operation of a fuel cell are formed as a single body. A peripheral module having the fuel feeder housing and a pump are modularized, thereby consulting the compactness and the light weight and enhancing the efficiency of the fuel cell. The fuel feeder housing is coupled to a fuel cartridge storing hydrogen-containing fuel and to a fuel cell that generates electricity through an electrochemical reaction between the fuel and an oxidant. The fuel feeder includes a base member in which a chamber for recycling unreacted fuel discharged from the fuel cell and first and second connecting portions for flowing fluid in and out the chamber therethrough are internally formed as a single body and a gas-liquid separator installed in an opening of the chamber and discharging gas from the chamber.
    Type: Application
    Filed: April 26, 2007
    Publication date: November 22, 2007
    Applicant: SAMSUNG SDI CO., LTD.
    Inventors: MING ZI HONG, YASUKI YOSHIDA, EUN SUK CHO, HO JIN KWEON
  • Electrode for fuel cell, membrane-electrode assembly for fuel cell, and fuel cell system including the same
    Publication number: 20070259253
    Abstract: A membrane-electrode assembly for a fuel cell of the present invention includes: an anode and a cathode facing each other; and a polymer electrolyte membrane interposed between the anode and the cathode. The anode and the cathode or both include an electrode substrate and a catalyst layer. The catalyst layer includes a catalyst, a hydrophilic ionomer, and a hydrophobic binder.
    Type: Application
    Filed: February 28, 2007
    Publication date: November 8, 2007
    Applicant: Samsung SDI Co., Ltd.
    Inventors: In-Hyuk Son, Ho-Jin Kweon, Sang-Il Han
  • Negative active material for lithium rechargeable batteries and method of fabricating same
    Patent number: 7285358
    Abstract: The present invention relates to a negative active material for a lithium rechargeable battery and a method of preparing the same, and the negative active material prepared by coating a carbon source with a coating liquid, and drying the carbon source, and the negative active material comprises a core having a carbon source with surface-treatment layer formed on the surface of the core, the surface-treatment layer having at least one compound of coating element selected from the group cosnsisting of amorphous, semi crystalline, or crystalline hydroxides, oxyhydroxides, oxycarbonates, and hydroxidecarbonates.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: October 23, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jung-Joon Park, Ho-Jin Kweon, Jang-Ho Yoon, Jun-Won Suh
  • Reformer and fuel cell system having the same
    Publication number: 20070224094
    Abstract: There is provided a fuel cell system comprising a reformer for generating hydrogen from hydrogen-containing fuel and at least one electricity generator for generating electric energy through an electrochemical reaction of hydrogen and oxygen. The reformer includes a plurality of reaction sections for generating hydrogen from hydrogen-containing fuel; a plurality of heating sections which supply thermal energy to the plurality of heating sections and which have a catalyst; and a main body receiving the plurality of reaction sections and the plurality of heating sections. The respective heating sections generate different amounts of thermal energy necessary for the reactions of the respective reaction sections.
    Type: Application
    Filed: September 16, 2005
    Publication date: September 27, 2007
    Inventors: Zin Park, Ju-Yong Kim, Hyun-Jeong Lim, Ji-Seong Han, Eun-Suk Cho, Ho-Jin Kweon
  • MEMBRANE-ELECTRODE ASSEMBLY FOR FUEL CELL AND FUEL CELL SYSTEM INCLUDING SAME
    Publication number: 20070207374
    Abstract: A membrane-electrode assembly includes a polymer electrolyte membrane, and a cathode and an anode disposed on each side of a polymer electrolyte membrane. The anode includes a catalyst layer contacted with the polymer electrolyte membrane and an electrode substrate disposed the other surface of the catalyst layer. The electrode substrate includes a first surface contacted with the catalyst layer and a second surface not contacted with the catalyst layer, and the first surface is hydrophilic. Or, the electrode substrate includes a first electrode substrate contacted with the catalyst layer, and a second electrode substrate disposed to contact with the first electrode substrate wherein the first electrode substrate is hydrophilic.
    Type: Application
    Filed: March 5, 2007
    Publication date: September 6, 2007
    Applicant: Samsung SDI Co., Ltd.
    Inventors: Chan-Gyun Shin, Sang-Il Han, In-Hyuk Son, Ho-Jin Kweon
  • Method for preparing sulfonated polystyrene for polymer electrolyte of fuel cell
    Patent number: 7244791
    Abstract: A method for preparing sulfonated polystyrene, whereby a styrene monomer having a sulfonyl chloride is prepared by reacting p-styrene sulfonic acid salt with a chloride, a styrene-based polymer having the sulfonyl chloride is synthesized by the polymerization of a p-styrene sulfonyl chloride monomer and optionally at least one monomer of a styrene and an acrylic monomer, the styrene-based polymer having the sulfonyl chloride is treated with an inorganic base aqueous solution to change the sulfonyl chloride into a SO3M group where M is an alkali metal, and treated with an acidic aqueous solution to prepare a styrene-based polymer having a sulfonic acid group. The styrene-based polymer having the sulfonic acid group prepared according to the process of the present invention has high proton conductivity and good mechanical properties.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: July 17, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Hyoung-Juhn Kim, Ho-Jin Kweon, Yeong-Chan Eun, Sung-Yong Cho
  • Membrane electrode assembly for fuel cell and fuel cell system including the same
    Publication number: 20070122688
    Abstract: The membrane-electrode assembly of the present invention includes an anode and a cathode facing each other, and a polymer electrolyte membrane interposed therebetween. At least one of the anode and the cathode includes an electrode substrate and a metal catalyst layer disposed thereon. The metal catalyst layer includes a metal catalyst and a liquid crystal material.
    Type: Application
    Filed: November 30, 2006
    Publication date: May 31, 2007
    Inventors: Young-Mi Park, Sung-Guk An, You-Mee Kim, Ho-Jin Kweon
  • Fuel cell
    Publication number: 20070122672
    Abstract: A fuel cell including a absorbing member is provided to improve performance and reliability of the fuel cell. The fuel cell includes an electricity generation unit and a medium member. The electricity generation unit includes a fuel supply unit, and a membrane electrode assembly (MEA), absorbing member, and air supply unit. A fuel is supplied through the medium member, and air is supplied through the air supply unit. During oxidation/reduction reaction between a fuel and air, condensed moisture or water is produced inside fuel cell, and the condensed moisture can block path of air flow into the fuel cell. In order to solve this problem, absorbing member is disposed between the membrane electrode assembly and the air supply unit. The absorbing member effectively absorbs moisture and blocking of air flow path by the moisture is prevented.
    Type: Application
    Filed: November 30, 2006
    Publication date: May 31, 2007
    Inventors: Ho-Jin Kweon, Sung-Jin Kim
  • Cathode catalyst for fuel cell, method of preparing same, and membrane-electrode assembly and fuel cell comprising same
    Publication number: 20070122683
    Abstract: A cathode catalyst for a fuel cell includes an Ru—Se alloy having an average particle size of less than or equal to 6 nm. The Ru—Se alloy is amorphous catalyst. A membrane electrode assembly and a fuel cell system include the cathode catalyst. A catalyst for a fuel cell is prepared by drying a ruthenium solution including a water-soluble ruthenium precursor to obtain a first dried product; subjecting the first dried product to a first heat-treatment to obtain a heat-treated product; adding an Se solution including a water-soluble Se precursor to the heat-treated product to obtain a mixture; drying the mixture to obtain a second dried product including ruthenium and Se; and subjecting the second dried product to second heat-treatment.
    Type: Application
    Filed: November 13, 2006
    Publication date: May 31, 2007
    Applicant: Samsung SDI Co., Ltd.
    Inventors: Alexey Alexandrovichserov, Chan Kwak, Ho-Jin Kweon, Si-Hyun Lee