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A method and system for monitoring the operation state of a PEM stack

A technology of operating state and stack, applied in circuits, fuel cells, electrical components, etc., can solve the problems of high cost and insufficient durability, and achieve the effect of accurate judgment

Active Publication Date: 2022-03-18
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Proton exchange membrane fuel cell, as a new type of energy generation device, is rapidly moving towards marketization, but there are still some problems to be solved urgently, such as insufficient durability and high cost

Method used

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  • A method and system for monitoring the operation state of a PEM stack
  • A method and system for monitoring the operation state of a PEM stack
  • A method and system for monitoring the operation state of a PEM stack

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Experimental program
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Embodiment 1 2

[0063] Embodiment 1 Verification of two-phase flow model

[0064] In the embodiment of the present invention, a 25kW metal plate stack is developed, and the flow field plate design is carried out. The basic structure of the flow field is as image 3 As shown, the active area is 280cm2, the flow channel depth is 0.4mm, the width is 1mm, and the length is 300mm; the battery operating temperature is 75°C and there is no back pressure. The CFD software was used to simulate the flow field, and the pressure drop value of the single-phase flow was obtained; using the aforementioned model, the pressure drop of the flow field was calculated and obtained under several working conditions; 10 metal plate single cells were formed into a short stack, and the Greenlight G500 Experiments were carried out on the above, and the measured values ​​of pressure drop in the flow field were obtained, which are summarized in Table 1.

[0065] Table 1 Flow resistance simulation-test data comparison o...

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Abstract

The invention discloses a method and system for monitoring the operating state of a PEM stack. The system includes a PEM stack, a flow field plate gas pressure monitoring device, a computer, and a battery internal resistance monitoring device; wherein: the flow field plate gas pressure monitoring device is used for The pressure difference between the inlet and outlet of the cathode flow field plate is monitored in real time; the internal resistance monitoring device of the battery is used to monitor the internal resistance of the single battery; the computer is connected with the gas pressure monitoring device of the flow field plate and the internal resistance monitoring device of the battery; During operation, the flow field plate gas pressure monitoring device and the battery internal resistance monitoring device transmit the collected pressure difference and internal resistance data signals to the computer, and the computer determines the operating status of the PEM stack, including normal, dry, and flooded; And through the feedback results to adjust the operating conditions to optimize the operating conditions of the stack. The invention can accurately judge and adjust the working state of the PEM stack, and can effectively optimize the working state.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method and system for monitoring the operating state of a PEM stack. Background technique [0002] Proton exchange membrane fuel cells, as a new type of energy generating device, are rapidly moving towards marketization, but there are still some problems to be solved urgently, such as insufficient durability and high cost. Key materials and components such as catalysts, membrane electrodes (Membrane Electrode Assembly: MEA) and bipolar plates are the main factors affecting their basic electrical properties and durability, so people have invested a lot of energy in related research. During the operation of the PEM stack, due to the operating conditions, there will be a flooded state or a partial dry state, which will cause a certain degree of damage to the components inside the stack. Therefore, this paper proposes a new monitoring method and system for this. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04298H01M8/0438H01M8/04537H01M8/04992
CPCH01M8/04305H01M8/04992H01M8/04432H01M8/04649Y02E60/50
Inventor 詹志刚陈中楠曾庆喜张迪施金榕潘牧
Owner WUHAN UNIV OF TECH
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