Patents by Inventor Michi Hashiba

Michi Hashiba 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).

  • Patent number: 10897049
    Abstract: A separator assembly for a fuel cell includes a first separator, a second separator, and a joined portion. In the joined portion, the first separator and the second separator are joined to each other through laser welding. The first separator includes a first surface that is intended to be opposed to the membrane electrode assembly. The first surface of the first separator includes an exposed portion where the base of the first separator is exposed. The second separator includes a second surface that is intended to be opposed to the membrane electrode assembly. A film including conductive particles is arranged on the entire second surface of the second separator. The joined portion is formed by irradiating the exposed portion of the first separator with laser.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: January 19, 2021
    Assignee: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Eiichiro Morozumi, Michi Hashiba, Takayuki Suzuki
  • Patent number: 10840520
    Abstract: A fuel cell stack includes a plurality of power generation cells stacked and connected in series and coolant passages configured to circulate coolant. The power generation cells each include a membrane electrode assembly and two separators sandwiching the membrane electrode assembly. The separators are each formed by a metal plate. The coolant passages include through-holes extending through the separators and aligned in a stacking direction of the power generation cells. A method for manufacturing a fuel cell stack includes forming a coating of electrodeposition paint on surfaces of ones of the separators having a high electric potential in the fuel cell stack by operating the fuel cell stack and using the coolant that contains electrodeposition paint particles.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: November 17, 2020
    Assignee: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Eiichiro Morozumi, Michi Hashiba
  • Publication number: 20190288299
    Abstract: A separator assembly for a fuel cell includes a first separator, a second separator, and a joined portion. In the joined portion, the first separator and the second separator are joined to each other through laser welding. The first separator includes a first surface that is intended to be opposed to the membrane electrode assembly. The first surface of the first separator includes an exposed portion where the base of the first separator is exposed. The second separator includes a second surface that is intended to be opposed to the membrane electrode assembly. A film including conductive particles is arranged on the entire second surface of the second separator. The joined portion is formed by irradiating the exposed portion of the first separator with laser.
    Type: Application
    Filed: March 7, 2019
    Publication date: September 19, 2019
    Applicant: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Eiichiro MOROZUMI, Michi HASHIBA, Takayuki SUZUKI
  • Publication number: 20190229354
    Abstract: A fuel cell stack includes a plurality of power generation cells stacked and connected in series and coolant passages configured to circulate coolant. The power generation cells each include a membrane electrode assembly and two separators sandwiching the membrane electrode assembly. The separators are each formed by a metal plate. The coolant passages include through-holes extending through the separators and aligned in a stacking direction of the power generation cells. A method for manufacturing a fuel cell stack includes forming a coating of electrodeposition paint on surfaces of ones of the separators having a high electric potential in the fuel cell stack by operating the fuel cell stack and using the coolant that contains electrodeposition paint particles.
    Type: Application
    Filed: January 9, 2019
    Publication date: July 25, 2019
    Applicant: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Eiichiro MOROZUMI, Michi HASHIBA
  • Publication number: 20090263697
    Abstract: A fuel cell stack includes a plurality of cells each including an MEA 10 sandwiched by separators 20. A hydrogen gas supply pipe 31 and an air supply pipe 32 for externally supplying gas, and a hydrogen gas discharge pipe 35 and an air discharge pipe 36 for discharging unreacted gas are connected to the stack. Gas-supply-side valves 33 and 34 are installed in the pipes 31 and 32, respectively. Gas-discharge-side valves 37 and 38 are installed in the pipes 35 and 36, respectively. The valves 33 and 37 close an anode-electrode-layer-side space including an anode electrode layer. The valves 34 and 38 close a cathode-electrode-layer-side space including a cathode electrode layer. This structure prevents introduction of new air, thereby suppressing an increase in the concentration of nitrogen gas in the anode-electrode-layer-side space.
    Type: Application
    Filed: July 13, 2006
    Publication date: October 22, 2009
    Applicant: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Keiji Hashimoto, Eiichirou Morozumi, Michi Hashiba
  • Publication number: 20090075140
    Abstract: An MEA includes an electrolyte membrane permeable to hydroxide ions. A catalyst layer formed of a hydrogen storage alloy is provided on one surface of the membrane facing the anode electrode layer. Another catalyst layer formed of platinum-on carbon is provided on the opposite surface of the membrane facing the cathode electrode layer. The catalyst layer on the anode-electrode-layer side dissociates hydrogen gas into atomic hydrogen, diffuses the atomic hydrogen by way of solid phase diffusion, and absorbs/desorbs atomic hydrogen. The catalyst layer on the cathode-electrode-layer side forms hydroxide ions from air, humidifying water, and electrons. The membrane allows movement of the hydroxide ions to the catalyst layer on the anode-electrode-layer side. This leads to formation of water on the anode-electrode-layer side, whereby occurrence of dry-up can be prevented. Even when flooding arises from formed water, atomic hydrogen can smoothly move through solid-phase diffusion.
    Type: Application
    Filed: July 20, 2006
    Publication date: March 19, 2009
    Applicant: TOYOTA SHATAI KABUSHIKI KAISHA
    Inventors: Keiji Hashimoto, Eiichirou Morozumi, Michi Hashiba