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Fuel cell system

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, transportation fuel cell technology, etc., can solve the problems of energy efficiency deterioration, electrolyte membrane drying, etc., and achieve the effect of suppressing scavenging treatment

Inactive Publication Date: 2010-03-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, as described above, if it is judged whether to end the scavenging process based only on the remaining capacity of the power storage device, for example, even if the remaining water amount of the fuel cell is appropriate, the scavenging process will be performed for a longer time than necessary, resulting in deterioration of energy efficiency. Or cause the electrolyte membrane of the fuel cell to be too dry, etc.

Method used

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Examples

Experimental program
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Effect test

Deformed example 1

[0060] In the above-mentioned embodiment, the operating state of the fuel cell 40 before the IG switch 45 is turned off is not particularly described, but the sweep may be changed according to the operating state (operation mode) of the fuel cell 40 before the IG switch 45 is turned off. gas control.

[0061] Figure 5 It is a flowchart showing the scavenging control process of Modification 1. also, Figure 5 The scavenging control process shown is relative to the Figure 4 The illustrated scavenging control process is provided with steps S100a, S100b. Other steps are the same as Figure 4 , therefore, the same symbols are assigned to the corresponding steps, and detailed descriptions thereof are omitted.

[0062] The scavenging control unit 160 receives the command to stop the power generation of the fuel cell 40 from the IG switch 45 (that is, the command to turn off the IG switch 45 ), stops the power generation of the fuel cell 40 according to the command, and confirm...

Deformed example 2

[0067] In Modification 1 described above, the SOC of the battery 20 is not particularly described, but the SOC control of the battery 20 may be changed according to the operation mode of the fuel cell 40 .

[0068] Figure 6 It is a flowchart showing the SOC control process of Modification 2. This SOC control process is intermittently executed by the control unit 10 during operation of the fuel cell 40 .

[0069] The control unit 10 first confirms the operation mode of the fuel cell 40 at this point in time (step S200). When it is determined that the normal operation mode is set, the control unit 10 performs SOC control of the battery 20 during normal operation (step S220), and when it is determined that the low temperature operation mode is set, it performs SOC control of the battery 20 during low temperature operation. SOC control (step S210).

[0070] Figure 7 is a graph illustrating the relationship between the SOC of the battery and the charge / discharge target power ...

Deformed example 3

[0073] In the present embodiment described above, the oxidizing gas and the fuel gas were exemplified as the gas supplied to the fuel cell during the scavenging process, but any gas capable of measuring impedance, such as nitrogen, is applicable.

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Abstract

Provided is a fuel cell system which can surely start a fuel cell system at the next time and suppress an unnecessary long-time scavenging process. An impedance comparison unit (150) compares an impedance reference value ins stored in a memory (151) to a measurement impedance stored in a measurement memory (152) so as to judge whether the water amount remaining in the system is lower than a threshold value. On the other hand, an SOC comparison unit (170) compares an SOC reference value stored in a memory (171) to a detected SOC stored in an SOC memory (172) so as to judge whether the detectedSOC is lower than the reference value. A scavenging control unit (160) performs scavenging control according to the two judgments.

Description

technical field [0001] The present invention relates to fuel cell systems. Background technique [0002] When the external temperature is low, there is a problem that the moisture generated inside the fuel cell system freezes after the fuel cell system stops, causing damage to piping or valves. How to drain moisture from the inside to the outside [0003] To perform such a scavenging process, an energy source other than the fuel cell is required, and as the energy source, an electric storage device that assists the output of the fuel cell, such as a capacitor or a storage battery, is used. [0004] However, the power storage device is not only used for the anode scavenging process, but also used as an energy source at the start-up of the fuel cell system. Therefore, after the system is stopped, when the outside air temperature drops and the fuel cell system needs to be started at a low temperature such as below freezing point, the remaining capacity of the power storage de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/00H01M8/10
CPCH01M8/04395H01M8/04626H01M8/04156Y02T90/32H01M2250/20H01M8/04253H01M8/04955H01M8/04223H01M8/04649H01M8/04358Y02E60/50H01M8/04388H01M16/006H01M8/04492Y02T90/40Y02E60/10H01M8/04302H01M8/04225H01M8/04G01R27/00G01R31/36
Inventor 今井敦志
Owner TOYOTA JIDOSHA KK