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A kind of low temperature starting method of proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in the direction of fuel cells, circuits, electrical components, etc., can solve problems affecting the overall performance of fuel cells, and achieve the same temperature rise rate, simple method operation, and smooth start-up process

Active Publication Date: 2022-03-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all use additional devices or require gas mixing equipment or heating equipment, and the volume and cost of additional facilities will undoubtedly have a great negative impact on the installation requirements and operability, thereby affecting the overall performance of the fuel cell.

Method used

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  • A kind of low temperature starting method of proton exchange membrane fuel cell
  • A kind of low temperature starting method of proton exchange membrane fuel cell
  • A kind of low temperature starting method of proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, low temperature startup at -10°C:

[0031] In a low temperature environment, first turn off the battery according to the conventional method; after the battery is turned off, before the temperature of the battery drops to freezing point, switch the air intake to the dry nitrogen channel, adjust the pressure balance on both sides of the cathode and anode, and maintain it at 0.1MPa. Remove any remaining moisture from these parts. When the battery temperature reaches -10°C, the load is used to balance the load on the fuel cell.

Embodiment 2

[0033] Such as figure 2 As shown, low temperature startup at -20°C:

[0034] The measured specific heat capacity of the 5-cell fuel cell stack is 2014J.kg -1 K -1 ;

[0035] Comparing with the fuel cell heating power (1000W), when the battery needs to heat up, when the air metering ratio is 0.1Acm -2 2.5 times lower, Q=(mCp N2 +mCp O2 )(T-T env ) = m out Cp(T-T env ), the total power required to raise the temperature from -20°C to 0°C is 688W, which is less than the heating power of the battery, which is 1000W. Note that in theory self-starting can be performed. In a low temperature environment, first turn off the battery according to the conventional method; after the battery is turned off, before the battery temperature drops to freezing point, switch to the dry nitrogen channel in the near future, adjust the pressure balance on both sides of the cathode and anode, and maintain it at 0.1MPa to eliminate residual moisture in these parts. When the battery temperatu...

Embodiment 3

[0037] Such as image 3 .Start-up plan: experimental condition parameter setting, air metering ratio: 3, hydrogen metering ratio: 2, loading method: one cycle (loading for 50s, stopping for 10s), load evenly until the internal temperature of the stack rises above 0°C; The density is slowly loaded to the rated current density. When the internal temperature of the stack rises above 55°C, turn on the circulating refrigerant switch. The temperature inside the stack will drop with the addition of refrigerant, and then rise again. When the internal temperature of the stack rises to 55 ℃, it is considered that the stack is fully started successfully.

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PUM

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Abstract

The invention relates to a method for starting a proton exchange membrane fuel cell below zero temperature, specifically a method for starting a proton exchange membrane fuel cell at a low temperature without relying on an external heating device. After the battery was parked at room temperature, it was purged with nitrogen. Afterwards, the fuel cell is heated in a balanced loading manner so that the fuel cell can reach a normal start-up temperature. The method can enable the proton exchange membrane fuel cell to start successfully at low temperature, and is beneficial to the practical application of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a method for starting a proton exchange membrane fuel cell at low temperature, specifically a method for starting at a low temperature without relying on an external heating device. The method does not require an additional heating device, not only saves fuel consumption, but also reduces fuel cell operating costs, and does not require complicated modification of the fuel cell system structure, thereby promoting the development of fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of simple structure, high energy density, fast start-up, no pollution, low noise, etc. It has broad prospects in vehicle power supply. [0003] Although fuel cell electric vehicles have been proven to be feasible from conceptual design to demonstration operation, there is still a gap between them and their practical application, and there are many problems to be solved urgently. Among them, the inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04225
CPCY02E60/50
Inventor 俞红梅裴昱孙树成郑利民邵志刚徐洪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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