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Fuel cell system and control method for fuel cell system

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, power system fuel cells, etc., can solve problems such as rising hydrogen concentration, inability to complete low-temperature start-up processing, and decreased electrification capacity of secondary batteries

Active Publication Date: 2020-09-18
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in a low-temperature environment, the electrification capability of the secondary battery also decreases, so the amount of power supplied from the secondary battery is limited, and the hydrogen concentration in the fuel gas flow path may not be raised to the desired hydrogen concentration. That is, the cold start process cannot be completed
Also, depending on the state of charge of the secondary battery, there is a problem that the low-temperature start-up process must be stopped in a state where the hydrogen concentration in the fuel gas flow path is lower.

Method used

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  • Fuel cell system and control method for fuel cell system
  • Fuel cell system and control method for fuel cell system
  • Fuel cell system and control method for fuel cell system

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no. 1 approach

[0032] figure 1 It is an explanatory diagram schematically showing the configuration of the fuel cell system of the first embodiment. The fuel cell system FC includes a fuel cell 10 , a fuel gas supply system, an oxidizing gas supply system, a cooling system, and a control unit 50 . It should be noted that, in this embodiment, the reaction gas is a general term for fuel gas and oxidizing gas supplied to the electrochemical reaction in the fuel cell 10 . The fuel gas includes, for example, pure hydrogen and a hydrogen-rich gas with a high hydrogen content, and the oxidizing gas includes, for example, air (atmospheric atmosphere) and oxygen.

[0033] The fuel cell 10 has an anode to which a fuel gas is supplied and a cathode to which an oxidizing gas is supplied. In this embodiment, a solid polymer fuel cell is used, and the fuel cell 10 includes a membrane electrode assembly (MEA: Membrane Electrode Assembly) having an anode on which an anode catalyst is supported on each sur...

no. 2 approach

[0065] Hereinafter, the fuel cell system FCa of the second embodiment will be described. Figure 7 It is an explanatory diagram schematically showing the configuration of the fuel cell system of the second embodiment. The fuel cell system FCa of the second embodiment differs from the fuel cell system FC of the first embodiment in the following two points: it includes a fuel off-gas circulation system for re-injecting fuel off-gas into the fuel cell 10; Including the hydrogen concentration increase processing procedure P1a of the fuel exhaust gas circulation system. It should be noted that, since other structures are the same as those of the fuel cell system FC of the first embodiment, the same reference numerals as those used in the first embodiment are assigned and descriptions thereof are omitted.

[0066] The fuel exhaust gas circulation system includes a fuel exhaust gas circulation pipe 112 that connects the fuel exhaust gas discharge portion 100 b of the fuel cell 10 to...

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Abstract

The present invention relates to a fuel cell system and a method for controlling the fuel cell system, which increase the hydrogen concentration in a fuel gas flow path of a fuel cell to a desired hydrogen concentration without being affected by the power supply capability of a secondary battery in a low temperature environment . The control part 50 of the fuel cell system (FC) uses the electric power of the secondary battery (41) to make the fuel gas concentration raising mechanism (12, 22 ) operation to execute fuel gas concentration increasing processing for increasing the fuel gas concentration toward the first target concentration. The control unit (50) starts power generation by the fuel cell (10) and uses electric power from the fuel cell (10) to increase the concentration of the fuel gas when the concentration of the fuel gas becomes equal to or higher than a second target concentration lower than the first target concentration. The raising mechanism (12, 22) operates to execute fuel gas concentration raising processing until the fuel gas concentration becomes equal to or higher than a first target concentration.

Description

[0001] This application claims the priority based on the JP Patent application (Japanese Patent Application No. 2016-042187) for which it applied on March 4, 2016, The whole indication is taken in by reference for all purposes. technical field [0002] The invention relates to a fuel cell system and a control method for the fuel cell system. Background technique [0003] When starting the fuel cell system in a low-temperature environment such as below freezing point, the moisture remaining in the fuel gas flow path in the fuel cell stack freezes, the fuel gas cannot sufficiently spread through the fuel gas flow path, and the concentration of the fuel gas is insufficient. degradation of power generation performance, destabilization, and damage to the fuel cell. In order to solve this problem, a low-temperature start-up processing technique for increasing the concentration of fuel gas in a fuel gas flow path prior to start-up of a fuel cell system in a low-temperature environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04089H01M8/04225H01M8/04302H01M8/0432H01M8/04791
CPCH01M8/04089H01M8/04223H01M8/0432H01M8/04798H01M8/0494H01M8/04097H01M8/04388H01M8/04402H01M8/04447H01M8/04201H01M2250/20Y02T90/40Y02E60/50H01M8/0438H01M8/0444
Inventor 小川朋宏丸尾刚常川洋之
Owner TOYOTA JIDOSHA KK