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Method for testing water content of membrane in proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell additives, fuel cell control, etc., can solve problems such as adverse effects on battery performance, changes in battery structure, and unsuitability for on-site applications

Inactive Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will change the battery structure and adversely affect the battery performance, so it is not suitable for field applications

Method used

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  • Method for testing water content of membrane in proton exchange membrane fuel cell
  • Method for testing water content of membrane in proton exchange membrane fuel cell
  • Method for testing water content of membrane in proton exchange membrane fuel cell

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Effect test

Embodiment

[0038] For a PEMFC single cell, the cell operating temperature is 60°C, and the MEA effective area is 270cm 2 , the membrane used is Nafion212 membrane, now it is necessary to know the water content of the membrane in the experimental operation, so as to implement the appropriate water management strategy, so that the fuel cell can play the best performance.

[0039] The water content in the membrane can be obtained by the following steps:

[0040] 1) For the Nafion212 membrane, the thickness is about 50 μm. According to the patent CN102338769B, it can be known that the water content in the membrane is about 12 after the fuel cell reaches a steady state under saturated humidification.

[0041] 2) When the membrane is saturated, the battery is discharged at 500mA / cm2. During this process, the AC impedance method is used to scan the battery at 1Hz-10kHz. The real part is the high-frequency impedance. The experimental results are attached figure 2 As shown in the figure, the mea...

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Abstract

The invention provides a method for monitoring the water content of a membrane in the operation of a proton exchange membrane fuel cell (PEMFC). The method can be used for monitoring the water content of the membrane online by combining theoretical calculation and experiments. Specifically, the variable quantity of film resistance in an initial state (saturated humidifying state) and a to-be-tested state is tested through an alternating-current impedance method, and the film water content in the to-be-tested state can be obtained online by combining film water content data in the initial state and applying a related theoretical formula. The testing method is simple and convenient, and the water content of the membrane can be known only by testing the high-frequency impedance of the battery during field application, so that the operation condition of the PEMFC can be known, the operation condition of the battery is optimized, data support is provided for improving water management in the battery; and the testing method is applicable to both a PEMFC electric pile and a single cell.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to the monitoring of the water content of the proton exchange membrane during the operation of the proton exchange membrane fuel cell. Background technique [0002] A fuel cell is an electrochemical reaction device that converts chemical energy in fuel and oxidant directly into electrical energy. Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell. It uses hydrogen as fuel, air or oxygen as oxidant, and the reaction product is water. It has the advantages of high efficiency, green, environmental protection, and low-temperature start-up. It can be used It can be used as a power source for mobile vehicles such as automobiles, airplanes, and submarines, and can also be used for telecommunication base stations and distributed power stations. In recent years, it has become one of the research hotspots in the field of new energy. [0003] The membrane electrode assemb...

Claims

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Application Information

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IPC IPC(8): H01M8/04492G01N27/04G01R31/389
CPCH01M8/045G01N27/048G01R31/389Y02E60/50
Inventor 耿江涛陈中岩衣宝廉邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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