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Method for activating fuel cell stack

A fuel cell stack, fuel cell technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of long activation process time, inability to meet mass production, etc., and achieve shortened activation time and good electrochemical performance. Performance, simple effect of activation process

Active Publication Date: 2019-11-05
江苏骥翀氢能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activation process takes a long time and cannot meet the needs of mass production

Method used

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  • Method for activating fuel cell stack
  • Method for activating fuel cell stack
  • Method for activating fuel cell stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A method for activating a fuel cell stack comprises the steps of:

[0077] (1) Pre-activation operation:

[0078] (a) to the fuel electrode supply of the fuel cell, the relative humidity is 80% hydrogen, the air electrode supply is 80% air, and the open circuit voltage V of the single cell is adjusted 4 1V for 5 minutes;

[0079] (b) Stop the gas supply to the fuel electrode and the air electrode, feed humidified nitrogen gas with a relative humidity of 80% to the two poles of the fuel cell, and purge the stack with nitrogen gas until the single-cell voltage V 2 down to 0.45V;

[0080] (c) Stop the nitrogen supply to the electrodes on both sides of the fuel cell, feed air with a humidity of 80% to the fuel electrode side, and feed hydrogen with a relative humidity of 80% to the air electrode side for 10 minutes;

[0081] (d) Stop the gas supply to the fuel electrode and the air electrode, and pass humidified nitrogen gas with a relative humidity of 80% to the two pol...

Embodiment 2

[0089] A method for activating a fuel cell stack comprises the steps of:

[0090] (1) Pre-activation operation:

[0091] (a) to the fuel electrode supply of the fuel cell, the relative humidity is 85% hydrogen, the air electrode supply is 85% air, and the open circuit voltage V of the single cell is adjusted 4 1.1V for 6 minutes;

[0092] (b) Stop the gas supply to the fuel electrode and the air electrode, feed humidified nitrogen gas with a relative humidity of 85% to the two poles of the fuel cell, and purge the stack with nitrogen gas until the single-cell voltage V 2 down to 0.47V;

[0093] (c) Stop the nitrogen supply to the electrodes on both sides of the fuel cell, feed air with a humidity of 85% to the fuel electrode side, and feed hydrogen with a relative humidity of 85% to the air electrode side for 10 minutes;

[0094] (d) Stop the gas supply to the fuel electrode and the air electrode, and pass humidified nitrogen gas with a relative humidity of 85% to the two p...

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Abstract

The invention relates to a method for activating a fuel cell stack. The method comprises the following steps: (1) carrying out primary pre-wetting activation and secondary pre-wetting activation on two poles of a fuel cell, and then loading a first current density to a membrane electrode activation voltage V0, wherein a process of reacting on two sides of the electrode to generate water is furtherincluded between the primary pre-wetting activation and the secondary pre-wetting activation; (2) activating the fuel cell obtained at the step (1) at a second current density, and then adjusting thevoltage of the single cell to V1 at a third current density, wherein the third current density is less than the second current density; (3) operating the fuel cell obtained at the step (2) at a fourth current density, and testing the change delta(V) of the voltage of the single cell within the time period T. The activation process is simple, the activation time can be controlled within 2 h, the requirement of batch production is met, and the fuel cell obtained through activation has good electrochemical performances.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a method for activating a fuel cell stack. 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. Fuel cells are not limited by the Carnot cycle and can efficiently convert chemical energy into electricity. Proton exchange membrane fuel cells are the most promising power sources for medium and long-distance electric vehicles due to their low-temperature start-up, simple structure, and easy operation. [0003] In order to enable the proton exchange membrane fuel cell to quickly achieve the best performance during operation, after the general fuel cell stack is assembled, it is necessary to activate the electrodes in the fuel cell stack under given conditions in advance. The activation process and mechanism of the proton exchan...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/04223
CPCH01M4/8878H01M8/04223Y02E60/50Y02P70/50
Inventor 付宇迟军
Owner 江苏骥翀氢能源科技有限公司
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