Patents by Inventor Katsuhiko Kohyama
Katsuhiko Kohyama 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).
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Patent number: 8865366Abstract: An assembling operation of a fuel cell is effectively simplified. With the simple and economical structure, the desired sealing function is achieved. The fuel cell (10) includes a membrane electrode assembly (14) and first and second metal separators (16, 18) sandwiching the membrane electrode assembly (14). Connection channels (28a, 28b) are provided on the first metal separator (16). The connection channels (28a, 28b) connect the oxygen-containing gas supply passage (20a) and the oxygen-containing gas discharge passage (20b) to the oxygen-containing gas flow field (26). The membrane electrode assembly (14) has first overlapping portions (66a, 66b) overlapped on the connection channels (28a, 28b) for sealing the connection channels (28a, 28b). The first overlapping portions (66a, 66b) comprise, in effect, a gas diffusion layer.Type: GrantFiled: March 29, 2012Date of Patent: October 21, 2014Assignee: Honda Motor Co., Ltd.Inventors: Narutoshi Sugita, Katsuhiko Kohyama, Shuhei Goto, Hiroshi Shinkai, Hiroyuki Tanaka, Takaki Nakagawa
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Publication number: 20120183881Abstract: An assembling operation of a fuel cell is effectively simplified. With the simple and economical structure, the desired sealing function is achieved. The fuel cell (10) includes a membrane electrode assembly (14) and first and second metal separators (16, 18) sandwiching the membrane electrode assembly (14). Connection channels (28a, 28b) are provided on the first metal separator (16). The connection channels (28a, 28b) connect the oxygen-containing gas supply passage (20a) and the oxygen-containing gas discharge passage (20b) to the oxygen-containing gas flow field (26). The membrane electrode assembly (14) has first overlapping portions (66a, 66b) overlapped on the connection channels (28a, 28b) for sealing the connection channels (28a, 28b). The first overlapping portions (66a, 66b) comprise, in effect, a gas diffusion layer.Type: ApplicationFiled: March 29, 2012Publication date: July 19, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Narutoshi SUGITA, Katsuhiko KOHYAMA, Shuhei GOTO, Hiroshi SHINKAI, Hiroyuki TANAKA, Takaki NAKAGAWA
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Patent number: 8221935Abstract: A coolant inlet manifold for coolant supply passages is attached to an end plate of a fuel cell stack. Pillars are provided on at least one end of the coolant inlet manifold in a longitudinal direction thereof. The pillars are fitted into through holes formed in the end plate, and are connected to a manifold body and to a connector.Type: GrantFiled: March 17, 2009Date of Patent: July 17, 2012Assignee: Honda Motor Co., Ltd.Inventors: Masaharu Suzuki, Go Morimoto, Katsuhiko Kohyama, Ayumu Ishizuka
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Patent number: 8192886Abstract: A fuel cell stack includes a stack body formed by stacking a plurality of power generation cells. A terminal, an insulating plate, and an end plate are provided at one end of the stack body, and a terminal, an insulating plate, and an end plate are provided at the other end of the stack body. Each of the terminals includes an electrically conductive plate member, and an electrically conductive rod terminal joined integrally with the electrically conductive plate member. A joint portion joining the electrically conductive plate member and the electrically conductive rod terminal is formed by friction stir welding.Type: GrantFiled: March 3, 2009Date of Patent: June 5, 2012Assignee: Honda Motor Co., Ltd.Inventors: Kimiharu Mizusaki, Mitsuru Sayama, Tadashi Nishiyama, Toshiki Kawamura, Katsuhiko Kohyama
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Patent number: 8153333Abstract: An assembling operation of a fuel cell is effectively simplified. With the simple and economical structure, the desired sealing function is achieved. The fuel cell includes a membrane electrode assembly and first and second metal separators sandwiching the membrane electrode assembly. Connection channels are provided on the first metal separator. The connection channels connect the oxygen-containing gas supply passage and the oxygen-containing gas discharge passage to the oxygen-containing gas flow field. The membrane electrode assembly has first overlapping portions overlapped on the connection channels for sealing the connection channels. The first overlapping portions comprise, in effect, a gas diffusion layer.Type: GrantFiled: May 21, 2004Date of Patent: April 10, 2012Assignee: Honda Motor Co., Ltd.Inventors: Narutoshi Sugita, Katsuhiko Kohyama, Shuhei Goto, Hiroshi Shinkai, Hiroyuki Tanaka, Takaki Nakagawa
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Patent number: 7964318Abstract: There is provided a coolant manifold that is installed to a fuel cell stack so as to distribute coolant through the fuel cell stack, which is constituted by stacking a plurality of unit cells and has more than one communication holes for coolant supply and at least one communication hole for coolant discharge, in which the coolant flows in an order from the communication holes for coolant supply through a plurality of the unit cells to the communication hole for coolant discharge. The coolant manifold includes a manifold body having a manifold chamber that extends along an alignment direction of the communication holes for coolant supply, and an external communication part having an external communication hole for communicating the manifold chamber with external. A center axis of the external communication hole is placed unparallel and non-vertical relative to a center axis of each communication hole for coolant supply.Type: GrantFiled: March 7, 2007Date of Patent: June 21, 2011Assignee: Honda Motor Co., Ltd.Inventors: Masaharu Suzuki, Hideaki Kikuchi, Katsuhiko Kohyama
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Patent number: 7846612Abstract: A fuel cell includes a membrane electrode assembly, and first and second separators. A first insulating bushing is attached to a first positioning hole of a first separator, and a second insulating bushing is attached to a second positioning hole of the second separator. An inner wall of the first insulating bushing is fitted to an outer wall of the second insulating bushing for positioning the first and second separators such that the first and second separators are insulated from each other.Type: GrantFiled: September 30, 2008Date of Patent: December 7, 2010Assignee: Honda Motor Co., Ltd.Inventors: Shuhei Goto, Katsuhiko Kohyama, Ken Takahashi, So Fujiwara, Ryugo Suzuki, Narutoshi Sugita
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Patent number: 7776464Abstract: A solid polymer electrolyte fuel cell (2) is formed from an electrode structure (7) and first and second separators (8, 9). The electrode structure (7) has a solid polymer electrolyte membrane (10), first and second electrode layers (11, 12), and first and second diffusion layers (13, 14). The first separator (8) forms a first gas passage (PH) through which a fuel gas (H) flows, and the second separator (9) forms a second gas passage (PA) through which an oxidizing gas (A) flows. A first jutting-out portion (15) of the solid polymer electrolyte membrane (10) and a second jutting-out portion (16) of the second diffusion layer (14) are joined together over the entire peripheries thereof via a cured adhesive layer (17), and the second jutting-out portion (16) is in a state in which it is impregnated by cured adhesive.Type: GrantFiled: March 26, 2004Date of Patent: August 17, 2010Assignee: Honda Motor Co., Ltd.Inventors: Katsuhiko Kohyama, Hiroshi Shinkai, Hiroyuki Tanaka
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Publication number: 20090233139Abstract: A coolant inlet manifold for coolant supply passages is attached to an end plate of a fuel cell stack. Pillars are provided on at least one end of the coolant inlet manifold in a longitudinal direction thereof. The pillars are fitted into through holes formed in the end plate, and are connected to a manifold body and to a connector.Type: ApplicationFiled: March 17, 2009Publication date: September 17, 2009Applicant: HONDA MOTOR CO., LTD.Inventors: Masaharu SUZUKI, Go MORIMOTO, Katsuhiko KOHYAMA, Ayumu ISHIZUKA
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Publication number: 20090226789Abstract: A fuel cell stack includes a stack body formed by stacking a plurality of power generation cells. A terminal, an insulating plate, and an end plate are provided at one end of the stack body, and a terminal, an insulating plate, and an end plate are provided at the other end of the stack body. Each of the terminals includes an electrically conductive plate member, and an electrically conductive rod terminal joined integrally with the electrically conductive plate member. A joint portion joining the electrically conductive plate member and the electrically conductive rod terminal is formed by friction stir welding.Type: ApplicationFiled: March 3, 2009Publication date: September 10, 2009Applicant: Honda Motor Co., Ltd.Inventors: Kimiharu MIZUSAKI, Mitsuru SAYAMA, Tadashi NISHIYAMA, Toshiki KAWAMURA, Katsuhiko KOHYAMA
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Publication number: 20090130524Abstract: A fuel cell includes a membrane electrode assembly, and first and second separators. A first insulating bushing is attached to a first positioning hole of a first separator, and a second insulating bushing is attached to a second positioning hole of the second separator. An inner wall of the first insulating bushing is fitted to an outer wall of the second insulating bushing for positioning the first and second separators such that the first and second separators are insulated from each other.Type: ApplicationFiled: September 30, 2008Publication date: May 21, 2009Applicant: Honda Motor Co., Ltd.Inventors: Shuhei GOTO, Katsuhiko Kohyama, Ken Takahashi, So Fujiwara, Ryugo Suzuki, Narutoshi Sugita
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Patent number: 7445865Abstract: A fuel cell includes a membrane electrode assembly, and first and second separators. A first insulating bushing is attached to a first positioning hole of a first separator, and a second insulating bushing is attached to a second positioning hole of the second separator. An inner wall of the first insulating bushing is fitted to an outer wall of the second insulating bushing for positioning the first and second separators such that the first and second separators are insulated from each other.Type: GrantFiled: November 6, 2003Date of Patent: November 4, 2008Assignee: Honda Motor Co., Ltd.Inventors: Shuhei Goto, Katsuhiko Kohyama, Ken Takahashi, So Fujiwara, Ryugo Suzuki, Narutoshi Sugita
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Patent number: 7306876Abstract: A membrane-electrode structure having an electrode catalyst layer adhered to a diffusion electrode, wherein the structure is manufactured by applying a catalyst paste onto a sheet substrate, and then dried to form a plurality of electrode catalyst layers. The electrode catalyst layers are thermally transferred onto each side of a polymer electrolyte membrane to form a laminated body. A first slurry is applied on a carbon substrate layer, and dried to form a water-repellent layer, and then, a second slurry is applied on the water-repellent layer, and dried to form a hydrophilic layer to form a diffusion electrode. The diffusion electrode is then laminated on the electrode catalyst layer through the hydrophilic layer, and then pressed under heating to integrate the laminated body and the diffusion electrode.Type: GrantFiled: November 26, 2003Date of Patent: December 11, 2007Assignee: Honda Motor Co., Ltd.Inventors: Masaki Tani, Hiroshi Shinkai, Katsuhiko Kohyama, Ichiro Tanaka, Yuichiro Hama, Junichi Yano
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Publication number: 20070218332Abstract: There is provided a coolant manifold that is installed to a fuel cell stack so as to distribute coolant through the fuel cell stack, which is constituted by stacking a plurality of unit cells and has more than one communication holes for coolant supply and at least one communication hole for coolant discharge, in which the coolant flows in an order from the communication holes for coolant supply through a plurality of the unit cells to the communication hole for coolant discharge. The coolant manifold includes a manifold body having a manifold chamber that extends along an alignment direction of the communication holes for coolant supply, and an external communication part having an external communication hole for communicating the manifold chamber with external. A center axis of the external communication hole is placed unparallel and non-vertical relative to a center axis of each communication hole for coolant supply.Type: ApplicationFiled: March 7, 2007Publication date: September 20, 2007Applicant: Honda Motor Co., Ltd.Inventors: Masaharu Suzuki, Hideaki Kikuchi, Katsuhiko Kohyama
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Patent number: 7232627Abstract: An electrode for a solid polymer fuel cell includes a gas diffusion layer, an electrode catalyst layer disposed between a solid polymer membrane of the fuel cell and the gas diffusion layer, and a water-holding layer disposed between the gas diffusion layer and the electrode catalyst layer. Under high-relative humidity conditions of reaction gases, flooding can be prevented because the electrode catalyst layer is made porous, while under low-relative humidity conditions of reaction gases, sufficient water contents can be stably provided thanks to the water-holding layer so that proton conductivity of the solid polymer membrane can be maintained appropriately. Consequently, high-performance and high-durability electrode and membrane electrode assembly for a solid polymer fuel cell can be provided such that the performance and the durability thereof are not affected by change in relative humidity in reactant gases supplied to the solid polymer fuel cell.Type: GrantFiled: November 7, 2003Date of Patent: June 19, 2007Assignee: Honda Motor Co., Ltd.Inventors: Kaoru Fukuda, Masaki Tani, Shigeru Inai, Hayato Kaji, Chikara Iwasawa, Shinya Watanabe, Katsuhiko Kohyama, Hiroshi Shinkai, Takeshi Muro
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Publication number: 20070042261Abstract: A solid polymer electrolyte fuel cell (2) is formed from an electrode structure (7) and first and second separators (8, 9). The electrode structure (7) has a solid polymer electrolyte membrane (10), first and second electrode layers (11, 12), and first and second diffusion layers (13, 14). The first separator (8) forms a first gas passage (PH) through which a fuel gas (H) flows, and the second separator (9) forms a second gas passage (PA) through which an oxidizing gas (A) flows. A first jutting-out portion (15) of the solid polymer electrolyte membrane (10) and a second jutting-out portion (16) of the second diffusion layer (14) are joined together over the entire peripheries thereof via a cured adhesive layer (17), and the second jutting-out portion (16) is in a state in which it is impregnated by cured adhesive.Type: ApplicationFiled: March 26, 2004Publication date: February 22, 2007Inventors: Katsuhiko Kohyama, Hiroshi Shinkai, Hiroyuki Tanaka
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Publication number: 20070020504Abstract: An assembling operation of a fuel cell is effectively simplified. With the simple and economical structure, the desired sealing function is achieved. The fuel cell includes a membrane electrode assembly and first and second metal separators sandwiching the membrane electrode assembly. Connection channels are provided on the first metal separator. The connection channels connect the oxygen-containing gas supply passage and the oxygen-containing gas discharge passage to the oxygen-containing gas flow field. The membrane electrode assembly has first overlapping portions overlapped on the connection channels for sealing the connection channels. The first overlapping portions comprise, in effect, a gas diffusion layer.Type: ApplicationFiled: May 21, 2004Publication date: January 25, 2007Applicant: Honda Motor Co., Ltd.Inventors: Narutoshi Sugita, Katsuhiko Kohyama, Shuhei Goto, Hiroshi Shinkai, Hiroyuki Tanaka, Takaki Nagawa
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Patent number: 7094492Abstract: A polymer electrolyte fuel cell has a catalytic layer comprising a material and a polymer electrolyte, and the catalytic layer contains a fibrous material such as carbon whiskers or hydrophilic fibers. The polymer electrolyte fuel cell in the present invention having a catalytic layer comprising a catalytic material, an ion conducting material, an electron conducting material, and a void forming agent, and voids having diameters of from 60 to 1000 nm in the catalytic layer has a void volume of from 0.15 to 0.25 cm3/g.Type: GrantFiled: October 10, 2002Date of Patent: August 22, 2006Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Takeshi Matsubara, Katsuhiko Kohyama, Hiroshi Shinkai
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Publication number: 20050008920Abstract: A membrane electrode assembly for a polymer electrolyte fuel cell has, as basic components, a polymer electrolyte membrane, a pair of electrode layers which sandwich the polymer electrolyte membrane, and a pair of gas-diffusion layers disposed outside the respective electrode layers. Electric medium layers are respectively provided between the electrode layer and the gas-diffusion layer at one side and between the electric layer and the gas-diffusion layer at the other side. Each of the electric medium layers is constituted of a plurality of carbon whiskers, a plurality of carbon particles and a binder including an electrolyte material. A content GW of the carbon whiskers in each of the electric medium layers is set at 10 wt %?GW?25 wt %. Thus, the membrane electrode assembly for the polymer electrolyte fuel cell can keep a high power generating performance by reducing the contact resistance between the gas-diffusion layers and the electrode layers.Type: ApplicationFiled: May 13, 2004Publication date: January 13, 2005Inventors: Katsuhiko Kohyama, Hiroshi Shinkai, Masaki Tani
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Publication number: 20040202916Abstract: A fuel cell includes a membrane electrode assembly, and first and second separators. A first insulating bushing is attached to a first positioning hole of a first separator, and a second insulating bushing is attached to a second positioning hole of the second separator. An inner wall of the first insulating bushing is fitted to an outer wall of the second insulating bushing for positioning the first and second separators such that the first and second separators are insulated from each other.Type: ApplicationFiled: November 6, 2003Publication date: October 14, 2004Applicant: Honda Motor Co., Ltd.Inventors: Shuhei Goto, Katsuhiko Kohyama, Ken Takahashi, So Fujiwara, Ryugo Suzuki, Narutoshi Sugita