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Method and system for low temperature cold start of hydrogen fuel cell

A fuel cell, 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: 2021-12-24
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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  • Method and system for low temperature cold start of hydrogen fuel cell
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  • Method and system for low temperature cold start of 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 method and system for low-temperature cold start of a hydrogen fuel cell. The method includes: 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 rate and a target hydrogen flow rate; Start the fuel cell when the PTC heats the fuel cell cooling system; adjust the air compressor speed to achieve the target air flow; adjust the proportional valve to achieve the target hydrogen flow; when the fuel cell temperature reaches the target temperature, Adjust the ratio of air flow and hydrogen flow to the value corresponding to the normal output power. The hydrogen fuel cell low-temperature cold start method and system of the present invention use the hydrogen side of the fuel cell and the overpotential of the oxygen concentration difference to lower the external output efficiency of the fuel cell, and convert as much chemical energy as possible into heat energy for heating the fuel cell stack body, Make the fuel cell warm up quickly.

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 Patents(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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