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Rapid activation method for fuel cell

An activation method and fuel cell technology, applied in fuel cells, electrochemical generators, circuits, etc., can solve the problems of slow temperature response, slow temperature drop of the stack, water flooding, etc., and achieve the effect of rapid activation

Active Publication Date: 2021-07-09
金华氢途科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activation method reduces the stack voltage by lowering the stack temperature during the activation process. However, the temperature of the stack of hundreds of knots decreases slowly, which requires high heat dissipation on the test bench. Once the temperature is too low, local condensation is easy to cause Flooding, it is easy for a single or several cells to be too low or even reversed. Due to the slow temperature response, the temperature cannot be raised quickly, resulting in irreversible damage to the stack

Method used

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  • Rapid activation method for fuel cell
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Experimental program
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Effect test

Embodiment 1

[0025] refer to figure 1 , an embodiment of the present invention provides a rapid activation method for a fuel cell, comprising the following steps:

[0026] S1. Stack airtightness test: check whether the airtightness of the fuel cell stack meets the airtightness index; if yes, proceed to the next step; if not, perform stack repair;

[0027] S2. Nitrogen purge: feed nitrogen into the anode and cathode of the stack to be activated to purge the stack; the stack purge time is 1 min;

[0028] S3. Feed reaction gas: After the ventilation and purging is completed, switch the reaction gas source, feed humidified hydrogen into the anode, and feed humidified oxygen into the cathode, so that the stack is in an open circuit state until the average single-cell open circuit voltage reaches 0.95V. 5min;

[0029] S4. Pre-activation: Turn on the load, select the constant current loading mode, gradually increase the current, and gradually increase the inlet pressure of the anode and cathode...

Embodiment 2

[0033] S1. Stack airtightness test: check whether the airtightness of the fuel cell stack meets the airtightness index; if yes, proceed to the next step; if not, perform stack repair;

[0034] S2. Nitrogen purge: feed nitrogen into the anode and cathode of the stack to be activated to purge the stack; the stack purge time is 2 minutes;

[0035] S3. Introduce reaction gas: After the ventilation and purging is completed, switch the reaction gas source, pass in humidified hydrogen to the anode, and pass in humidified oxygen to the cathode, so that the stack is in an open circuit state until the average single-cell open circuit voltage reaches 0.96V, and maintain 4min;

[0036] S4. Pre-activation: turn on the load, select the constant current loading mode, gradually increase the current, and gradually increase the inlet pressure of the anode and cathode until the activation voltage is V1, the V1 is 0.62V, the cathode inlet pressure is 90kPa, and the anode remains higher than The ...

Embodiment 3

[0040] S1. Stack airtightness test: check whether the airtightness of the fuel cell stack meets the airtightness index; if yes, proceed to the next step; if not, perform stack repair;

[0041] S2. Nitrogen purge: feed nitrogen into the anode and cathode of the stack to be activated to purge the stack; the stack purge time is 3 minutes;

[0042] S3. Introduce reaction gas: After the ventilation and purging is completed, switch the source of reaction gas, pass in humidified hydrogen to the anode, and pass in humidified oxygen to the cathode, so that the stack is in an open circuit state until the average single-cell open circuit voltage reaches 0.97V, and maintain 3min;

[0043] S4. Pre-activation: Turn on the load, select the constant current loading mode, gradually increase the current, and gradually increase the inlet pressure of the anode and cathode until the activation voltage is V1, the V1 is 0.65V, the cathode inlet pressure is 100kPa, and the anode remains higher than ...

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Abstract

The invention provides a rapid activation method for a fuel cell. The rapid activation method comprises the following steps: S1, testing the air tightness of a galvanic pile; S2, carrying out nitrogen purging; S3, introducing a reaction gas; S4, pre-activating; S5, carrying out step-down-step-up circulation activation; and S6, completing activation. Firstly, nitrogen is used for purging cathode and anode pipelines to fully discharge gas in the pipelines, so irreversible damage caused by a hydrogen-air interface of an anode is avoided; then, humidified fuel and an oxidizing agent are introduced to maintain high open-circuit voltage, and impurities introduced on the surface of the cathode catalyst layer in the membrane electrode preparation process can be removed; through constant-current loading and operation under high current, a membrane electrode can be quickly humidified by water generated by reaction; and through high-current drop-boost circulation, the circulation of the average single-section voltage of a stack between high and low potentials is realized, so that an oxide layer on the surface of a cathode catalyst layer is reduced, a stable electron, ion, gas and liquid transmission channel is rapidly formed, and rapid activation of the fuel cell stack is realized.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a rapid activation method for fuel cells. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy through an electrocatalytic reaction on electrodes. Polymer electrolyte membrane fuel cells (polymer electrolyte membrane fuelcell, PEMFC) usually have high power density and energy efficiency, short start-up time and rapid response to load changes. PEMFC is mainly composed of bipolar plates, membrane electrodes and fixed end plates, and the output power of the stack depends greatly on the output performance of the membrane electrodes. The performance of the prepared new membrane electrode is generally poor. The main reasons are: ①The transmission channel (the anode fuel is transferred to the catalytic layer, the protons generated by the anode are transferred to the cathode, and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04223H01M8/04313H01M8/04746H01M8/04858
CPCH01M8/04223H01M8/04313H01M8/0491H01M8/04753Y02E60/50
Inventor 周鸿波郭志阳陆建山王勃
Owner 金华氢途科技有限公司
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