Hitachi, Ltd.

Hiroshi Yamauchi

Kenji Yamaga

Ko Takahashi

Masahiro Komachiya

Masanori Sakai

Katsumi Mabuchi

Katsunori Nishimura

Takuya Takahashi

Ren Morinaka

Noriyuki Ohnaka

Shigeo Hattori

Eisaku Hayashi

Toshimi Matsumoto

Yasumasa Tamai

Yoshinari Hori

Tsutomu Onuma

Keiichi Uraki

Akira Onuma

Mitsuo Nakamura

Kou Takahashi

Toshitaka Satsuta

Yoshihide Kondo

A separator for a fuel cell, comprising a planar panel formed therein with a plurality of manifolds for passing reactive fluid or cooling medium through adjacent cell, and a pair of conductive passage boards superposed with one another, interposing therebetween the planar panel, the passage boards being formed therein with a plurality of meandering through channels for distributing the reactive fluid or the cooling medium from the manifolds, wherein the planar panel being formed therein with slits through which channel defining walls of the meandering through channels of the fluid passages are electrically connected with each other.

Separator and fuel cell using thereof

A part of cell stack portions constituting a part of a fuel cell stack is used as a voltage detection portion, the size of a frequency component belonging to a predetermined specific frequency range is extracted from a voltage signal detected and the existence/absence of abnormality of a fuel cell system is diagnosed on the basis of the frequency component extracted.

Fuel cell system and diagnosis system for the fuel cell system

A separator includes an electrically conductive flat plate and two electrically conductive channel plates superposed on each other with the electrically conductive flat plate interposed therebetween. The separator includes a plurality of manifolds for passing a reaction fluid to an adjacent cell are provided in the electrically conductive flat plate, and a plurality of zigzag or straight through-channels for permitting the flowing of the reaction fluid from the manifolds are formed in each of the two channel plates. The separator includes the through-channels in any one of the two electrically conductive channel plates disposed so that they are partially overlapped with the manifolds in the electrically conductive flat plate, and the through-channels in the other electrically conductive channel plate are formed to be partially larger than the contour of the electrically conductive flat plate.

Separator for fuel cell and fuel cell containing the separator

A fuel cell device including a fuel cell stack unit, a fuel reform unit, a material feed unit, a cooling water supply unit, and a control unit further includes a memory section, constructed of a rewritable memory, for storing information necessary for maintenance or inspection of the fuel cell device. The memory section is partitioned into a use environment information memory area for storing use environment conditions, a material feed information memory area for storing attribute information of the material feed unit, a fuel reform information memory area for storing attribute information of the fuel reform unit, a cell stack information memory area for storing attribute information of the fuel cell stack unit and a cooling water supply information memory area for storing attribute information of the cooling water supply unit.

Fuel cell device and fuel cell management system

Disclosed is a fuel cell having two or more stacked units each containing a first separator in which a manifold and fuel gas passage section are formed, first seal sheet which seals the first separator periphery, membrane electrode assembly, second seal sheet which seals a second separator periphery and second separator in which a manifold and oxidizing gas passage section are formed, in this order, wherein each of the fuel gas passage section and oxidizing gas passage section is in communication with the corresponding manifold. Comb teeth structure having comb teeth are provided between the fuel gas passage section and manifold and between the oxidizing gas passage section and manifold in a diffusion layer on the membrane electrode assembly, wherein slits spaces formed between the comb teeth are in communication with the diffusion layer.

Fuel cell and separator structure used therein

An underwater laser processing system has a laser torch; a laser torch driving mechanism for changing a laser emission position of the laser torch; and a chamber with one end opened to an external environment, which contains the laser torch; wherein a partitioning wall for preventing permeation of water is provided between a free end of the chamber and the laser torch. The system is used for detecting a sensitized portion and repairing it at one time using a sensitization detecting arrangement. Moreover, it is used for forming an alloying layer by melting a sprayed coating film, and for forming a new surface layer by emitting a laser beam through a solution containing a metal component.

Underwater laser processing device including chamber with partitioning

A corrosion degree measuring method capable of field measurement for intergranular corrosion, particularly the sensitization degree, of the plant's structural materials in a narrow space. The metal electrode made of a material being measured and the counter electrode to the metal electrode are immersed in an electrolytic solution. A voltage is applied to the metal electrode in the anodic direction so as to raise the potential of the metal electrode up to the passive state potential and to keep the metal electrode at the passive state potential. The passive state potential is used as a reference potential, and a pulse-like potential signal is applied to the metal electrode in the cathodic direction. At the time of the application of the pulse potential signal, a current between the metal electrode and the counter electrode is measured, and the corrosion degree of the material being measured is determined from the intensity of the current.

Method and apparatus for measuring degree of corrosion of metal materials

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Hitachi, Japan

Hiroshi Yamauchi