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Method for operating fuel cell system and setting relative humidity of cathode operating gas

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell control, fuel cell additives, etc., can solve the problems of not reaching the target humidity, inaccuracy, etc., and achieve the goal of avoiding the reduction of relative humidity and preventing temperature changes Effect

Inactive Publication Date: 2018-08-14
VOLKSWAGEN AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors have determined that in this case the setting of the desired humidity of the cathode operating gas can only be very inaccurate and often the target humidity in the stack is not reached

Method used

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  • Method for operating fuel cell system and setting relative humidity of cathode operating gas
  • Method for operating fuel cell system and setting relative humidity of cathode operating gas
  • Method for operating fuel cell system and setting relative humidity of cathode operating gas

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Embodiment Construction

[0040] figure 1 A fuel cell system, generally designated 100 , according to a preferred embodiment of the invention is shown. The fuel cell system 100 may be part of a vehicle not shown further, in particular an electric vehicle having an electric traction motor which is supplied with electrical energy via the corresponding fuel cell system 100 .

[0041] The fuel cell system 100 comprises, as a core component, a fuel cell stack 10 having a plurality of individual cells 11 arranged in a stack shape through alternately stacked membrane-electrode-assemblies (MEAs) 14 and bipolar plates. 15 constructions (refer to snippet for details). Each individual cell 11 thus comprises an MEA 14 in each case and catalytic electrodes arranged on both sides, namely an anode and a cathode, which catalyze the respective partial reactions of the fuel cell conversion, wherein the MEAs 14 have here Ion-conducting polymer electrolyte membrane not shown further. The anode and cathode electrodes ha...

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Abstract

The invention relates to a method for operating a fuel cell system during a heating phase or another transient operating phase or a method for setting a relative humidity of a cathode operating gas. The fuel cell system comprises a fuel cell stack with anode and cathode chambers separated by polymer electrode membranes, and a cathode supply device for supplying and discharging the cathode operating gas into and out of the cathode chambers, as well a cooling system for adjusting the temperature of the fuel cell stack. The method has the following steps: determining an inlet temperature of the cathode operating gas at the inlet of the fuel cell stack, setting a coolant setpoint temperature at the inlet of the fuel cell stack to a value which is equal to or less by a predetermined amount thanthe inlet temperature of the cathode operating gas, and controlling the cooling system so that a coolant temperature prevailing at the inlet of the fuel cell stack at least approximates the coolant setpoint temperature.

Description

technical field [0001] The invention relates to a method for operating a fuel cell system during a warm-up phase or other transient operating phases of the fuel cell system. The invention furthermore relates to a method for setting the relative humidity of the cathode operating gas during a preheating phase or other transient operating phases. The invention furthermore relates to a fuel cell system and a corresponding vehicle which are designed to carry out the method. Background technique [0002] Fuel cells use the chemical conversion of fuel and oxygen into water to generate electricity. For this purpose, fuel cells contain a so-called membrane-electrode-assembly (MEA: Membrane-Electrode-Assembly) as a core component, which is composed of an ion-conducting (mostly proton-conducting) membrane and is arranged on both sides of the membrane A structure consisting of a catalytic electrode (anode and cathode) respectively. The latter mostly consist of supported noble metals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04007H01M8/04119H01M8/043H01M8/0432H01M8/04701H01M8/04828
CPCH01M8/043H01M8/04007H01M8/04119H01M8/04335H01M8/04723H01M8/04835H01M8/04358H01M8/04507H01M8/04225H01M8/1018H01M8/04067H01M2250/20H01M8/04708H01M2008/1095H01M8/04149Y02E60/50Y02T90/40
Inventor N.格林赫尔德
Owner VOLKSWAGEN AG
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