Fuel cell system
A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, circuits, etc., can solve the problems of hydrogen concentration sensor degradation and failure, corrosion and short circuit, output instability, etc.
Inactive Publication Date: 2008-11-12
HONDA MOTOR CO LTD
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Problems solved by technology
In this case, the hydrogen concentration sensor may deteriorate or malfunction, etc.
In particular, in the solid polymer membrane fuel cell described above, since the normal operating temperature is lower than the vaporization temperature of water, and the exhaust gas has a high humidity, moisture in the exhaust gas is likely to condense.
[0006] In addition, when the above-mentioned gas contact combustion type hydrogen concentration sensor is installed in the flow path of the cathode exhaust gas, if there is humidification water and reaction product water, etc. Repeated power-on and power-off in the state of the detection element may cause corrosion and short-circuiting of the element power-carrying part inside the sensor.
In addition, the output may become unstable due to the adhesion of moisture
Method used
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[0026] Next, one embodiment of the fuel cell system of the present invention will be described with reference to the drawings.
[0027] FIG. 1 is a schematic perspective view of a fuel cell stack according to this embodiment. The fuel cell stack 1 is constituted by stacking a plurality of single fuel cells (hereinafter referred to as "single cells") 10 and electrically connecting them in series, with end plates 90A and 90B disposed on both sides thereof, and connected by tie rods not shown.
[0028] figure 2 It is an expanded view of a single battery. The single cell 10 has a sandwich structure in which separators 30A, 30B are arranged on both sides of a membrane electrode assembly 20 . Specifically, the membrane electrode assembly 20 is constituted by, for example, arranging the anode electrode 22 and the cathode electrode 23 on both sides of a solid polymer electrolyte membrane (electrolyte membrane 21) made of a fluorine-based electrolyte material, facing the membrane ele...
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This fuel cell system is provided with: a fuel cell which is supplied with cathode gas and anode gas and generates electrical power; a discharged gas processing device which mixes and dilutes cathode off-gas and anode off-gas discharged from the fuel cell; a discharge gas pipe through which exhaust gas discharged from the discharged gas processing device flows; a specific gas concentration sensor disposed in the discharge gas pipe, which measures a concentration of a specific gas in the exhaust gas; and an enlarged cross-section area flow path section provided between the discharged gas processing device and the specific gas concentration sensor, and having a flow path cross-section area that is larger than that of the discharge gas pipe.
Description
technical field [0001] The present invention relates to a fuel cell system mounted on a fuel cell vehicle or the like. Background technique [0002] A fuel cell is known to have a structure in which a solid polymer electrolyte membrane is sandwiched from both sides by an anode electrode and a cathode electrode to form a membrane electrode structure, and a pair of separators are arranged on both sides of the membrane electrode structure to form a flat single cell. A fuel cell (hereinafter referred to as a "single cell") is stacked to form a fuel cell stack (hereinafter referred to as a "fuel cell"). In this fuel cell, hydrogen gas is supplied as a fuel gas between the anode electrode and the separator, and air is supplied as an oxidant gas between the cathode electrode and the separator. As a result, hydrogen ions generated at the anode electrode by catalytic reprinting permeate the solid-raised molecular electrolyte membrane and move to the cathode electrode, where they ele...
Claims
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IPC IPC(8): H01M8/04
CPCY02E60/50H01M8/04089H01M2008/1095H01M8/04201H01M8/0662
Inventor 佐佐木孝铃木昭博鹈饲阳太郎大盐清隆石井康夫沼田英雄
Owner HONDA MOTOR CO LTD