Proton exchange membrane fuel cell cathode and anode pressure balance control method and device
A proton exchange membrane and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as differences in response speed and control range, large pressure difference, and impact on fuel cell life
Active Publication Date: 2021-02-23
HEFEI UNIV OF TECH
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Problems solved by technology
To control the balance of fuel cell cathode and anode pressure, it is necessary to jointly control multiple flow control elements. Due to the difference in response speed and control range of each flow control element, during the dynamic adjustment process, fuel cell cathode and anode are prone to large pressure differences. thereby affecting the life of the fuel cell
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[0076] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0077] Such as figure 2 As shown, the specific embodiment of the present invention discloses a cathode and anode pressure balance control method of a proton exchange membrane fuel cell, including the cathode pressure control step S100 and the anode pressure follow control step S200.
[0078] Cathode pressure control step S100 includes:
[0079] S101. Calculating the peroxygen ratio deviation, the steps are as follows:
[0080] a1. According to the load current demand, use the following formula to calculate the oxygen mass flow rate required for the cathode reaction:
[0081]
[0082] in, Indicates the mass flow rate of oxygen required for the cathode reaction, I st Indicates the load current, Represents the molar mass of oxygen, which is 32g / mol, N represents the number of single cells, and F represents Faraday's constant.
[0083...
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The invention provides a proton exchange membrane fuel cell cathode and anode pressure balance control method, and the method comprises a cathode pressure control step and an anode pressure followingcontrol step, and is characterized in that the cathode inlet flow and the outlet flow are adjusted by controlling the voltage of an air compressor and the opening degree of a throttle valve, so that the cathode pressure control is realized; by controlling the opening degree of the flow valve and the voltage of the hydrogen circulating pump, the anode inlet flow and the outlet flow are adjusted, and then anode pressure control is achieved. The invention further provides a proton exchange membrane fuel cell cathode and anode pressure balance control device. The cathode part realizes stable starting of the air compressor based on peroxide ratio control, the anode part realizes decoupling control of the flow valve and the hydrogen circulating pump, the pressure balance of the cathode and the anode of the proton exchange membrane fuel cell can be rapidly controlled or the set pressure difference is maintained, and the service life of the proton exchange membrane is prolonged.
Description
technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method and device for controlling the pressure balance of the cathode and anode of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells have the advantages of high efficiency, high energy density, and zero pollution. They are likely to become the next generation of vehicle power devices to replace internal combustion engines. Lifespan and cost are the two main limiting factors. At present, the service life of proton exchange membrane fuel cells for vehicles is basically below 5000h, and the economy is poor. The unbalanced anode and cathode pressures of fuel cells will cause additional stress on the proton exchange membrane and reduce the life of the proton exchange membrane. [0003] The main components of a proton exchange membrane fuel cell are figure 1 As shown, the air compressor 1 is connected to the inlet of the cat...
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IPC IPC(8): H01M8/04089H01M8/04992H01M8/04746H01M8/04858
CPCH01M8/04097H01M8/04104H01M8/04753H01M8/04888H01M8/04992Y02E60/50
Inventor 常九健王晓林谢地林王晨方建平龙涛王家钥张煜帆
Owner HEFEI UNIV OF TECH