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Activation method of proton exchange membrane fuel cell stack

A fuel cell stack, proton exchange membrane technology, applied in fuel cells, electrochemical generators, circuits, etc., can solve the problems of high cost, long time, low activation efficiency, etc.

Active Publication Date: 2020-08-28
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the time-consuming, high cost and low activation efficiency of the proton exchange membrane fuel cell stack activation method in the prior art defects, and provide a proton exchange membrane fuel cell stack activation method

Method used

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  • Activation method of proton exchange membrane fuel cell stack

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Experimental program
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Effect test

Embodiment 1

[0096] Proton exchange membrane fuel cell stack: Set the cooling water flow rate according to the number of stacks (the stack is composed of multi-section bipolar plates) (those skilled in the art can make routine settings according to the number of stacks, the pressure difference between the outlet and the inlet, and the temperature difference The water flow rate is generally increased by 1L / min for each additional section), to ensure that the pressure difference between the inlet and outlet of the water chamber is within 50kPa.

[0097] The initial (unactivated) battery stack used in this embodiment can be a conventional battery stack in the field, which is composed of 5 metal bipolar plates.

[0098] S0. The battery stack to be activated needs to meet the air tightness test standard. Therefore, before the heat engine, the battery stack to be activated is generally installed on the test platform, and the cathode and anode of the battery stack are purged with nitrogen gas. Ge...

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Abstract

The invention discloses an activation method of a proton exchange membrane fuel cell stack. The activation method comprises the steps of S1, engine heating, wherein the initial temperature is room temperature, the stack temperature is 40-85 DEG C, humidifying gas is introduced into a cathode and an anode, and the temperature is higher than the stack temperature by 5-20 DEG C but not higher than 90DEG C; S2, carrying out current activation, specifically, S21, loading current density in a stepped manner from 0 to X1, wherein X1 is greater than or equal to 100mA / cm<2> and less than or equal to 400mA / cm<2>, and the stack temperature is 40-60 DEG C; S22, loading current density in a stepped manner from X1 to less than or equal to 2000mA / cm<2>; S23, reducing the current density in a stepped manner to X3, wherein X3 is greater than or equal to 100mA / cm<2> and less than or equal to 400mA / cm<2>; S24, reducing the current density in a stepped manner to 0, wherein in the steps S22-S24, the backpressure of the cathode and the anode is 0-50KPa and is not 0; and S3, carrying out voltage activation. According to the invention, the stack can be pre-humidified by effectively controlling the parameters of current activation; and the activation process is low in cost and operates under large current, so that the activation efficiency is improved, and the activation time is shortened.

Description

technical field [0001] The invention relates to an activation method for a proton exchange membrane fuel cell stack. Background technique [0002] A fuel cell stack is a power generation device composed of multiple single cells in series, which converts the chemical energy of the fuel into electrical energy. After the fuel cell stack is assembled and formed, its performance needs to be activated to ensure that the performance of the fuel cell stack reaches the best state of use. The battery stack has good performance. If the stack is not activated, the performance of the stack will not be fully utilized, and the entire stack may be unusable due to the low performance of a single cell. The activation of the stack before use can not only give full play to the performance of the stack, but also a test of the stack product. Therefore, it is a necessary step for the industrialization of fuel cell stacks to activate the stack before entering the installation process. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M8/04119H01M8/04223
CPCH01M8/04126H01M8/04223Y02E60/50
Inventor 郑立能杨敏
Owner SHANGHAI ELECTRICGROUP CORP
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