Low-temperature cold start method and system for hydrogen fuel cell

A fuel cell and cold start technology, applied in fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve the problems of excessive water and long time consumption in the cooling system

Active Publication Date: 2020-09-01
KUSN FUERSAI ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used starting method is to directly heat the water in the cooling system of the fuel cell through the on-board PTC, but this method has the problem that there is more water in the cooling system, which takes a long time

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  • Low-temperature cold start method and system for hydrogen fuel cell
  • Low-temperature cold start method and system for hydrogen fuel cell
  • Low-temperature cold start method and system for hydrogen fuel cell

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0056] In the embodiment of the present invention, the concentration difference overpotential refers to: the electrochemical reaction of the fuel cell continuously consumes oxygen, which causes the actual partial pressure of oxygen supplied by the air system of the fuel cell (equivalent to the concentration) to be different from the partial pressure of oxygen in the cathode catalyst layer. The partial pressure difference is expressed as the pressure gradient in the gas diffusion layer, which promotes the diffusion of oxygen towards the catalyst layer. The lower the oxygen partial pressure in the catalyst layer, the higher the activation overpotential of the oxygen reduction reaction...

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Abstract

The invention discloses a low-temperature cold start method and system for a hydrogen fuel cell. The method comprises the following steps of setting a target heating rate and a target temperature of the fuel cell; calculating a target output current according to the target heating rate; calculating a target air flow and a target hydrogen flow; starting the fuel cell when a PTC heats a fuel cell cooling system; achieving the target air flow by adjusting the rotating speed of an air compressor; achieving the target hydrogen flow by adjusting a proportional valve; and after the temperature of thefuel cell reaches the target temperature, adjusting the ratio of the air flow to the hydrogen flow to a normal output power corresponding value. According to the low-temperature cold starting methodand system for the hydrogen fuel cell, the concentration difference overpotentials of the hydrogen side and the oxygen side of the fuel cell are used for lowering the external output efficiency of thefuel cell, the chemical energy as much as possible is converted into the heat energy to be used for heating a fuel cell stack body, so that the fuel cell is rapidly warmed up.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cells, in particular to a low-temperature cold start method and system for hydrogen fuel cells. Background technique [0002] Fuel cells for vehicles must withstand complex environmental tests such as reaction gas pollution, start and stop, cold start, high potential and high load, among which cold start is the biggest challenge for fuel cell vehicles to operate in an alpine environment. [0003] At present, the commonly used start-up method is to directly heat the water in the heat dissipation system of the fuel cell through the on-board PTC, but this method has the problem that there is more water in the heat dissipation system, and thus takes a long time. Contents of the invention [0004] In order to solve the above-mentioned technical problems, one of the objects of the present invention is to provide a low-temperature cold start-up method for a hydrogen fuel cell that can realize rap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04007H01M8/04223H01M8/04225H01M8/04302H01M8/04746
CPCH01M8/04037H01M8/04225H01M8/04268H01M8/04302H01M8/04753H01M2250/20Y02E60/50
Inventor 徐加忠柯信王亮
Owner KUSN FUERSAI ENERGY
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