Fuel cell system and shutdown purging method thereof

A fuel cell system and electric stack technology, which is applied in the direction of fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve the problems of inability to effectively purge humidifiers and stack membranes, and achieve thermal purge, Extend the service life and avoid the effect of high potential

Pending Publication Date: 2022-01-21
BEIJING SINOHYTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention aims to provide a fuel cell system and its shut-down purging method to solve the problem that the prior art cannot effectively purge the humidifier and the electric stack without causing mechanical damage to the membrane

Method used

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  • Fuel cell system and shutdown purging method thereof
  • Fuel cell system and shutdown purging method thereof
  • Fuel cell system and shutdown purging method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] One embodiment of the present invention discloses a fuel cell system, such as figure 1 As shown, including electric stack, air compressor, water pump, heater, radiator, humidifier, three-way valve one and controller.

[0064] Among them, the air inlet of the stack is connected to the output end of the air compressor through the humidifier, the coolant inlet is connected to the output end of the three-way valve one, the coolant outlet is connected to the inlet of the water pump; the outlet of the water pump is connected to the three-way valve through the heater. The input end one of the through valve one is connected, and is connected with the input end two of the three-way valve one through the radiator.

[0065] The controller is used to control the first input end of the three-way valve one to be turned on and the second input end to be closed after receiving the shutdown command, to start the water pump and the heater until the temperature of the coolant inlet water ...

Embodiment 2

[0069] To improve on the basis of Example 1, the fuel cell system also includes a three-way valve two, such as Figure 2~3 shown.

[0070] Wherein, the input end of the electronically controlled three-way valve two is connected to the output end of the air compressor, the output end one is connected to the air inlet of the humidifier, the output end two is connected to the air inlet of the stack, and the control end is connected to the controller output connection.

[0071] Preferably, an air filter is provided at the front end of the air compressor to filter impurities such as dust and particles in the air, which is beneficial to improve the service life of the stack.

[0072] Preferably, the heater can be a PTC heater. The heater has the advantages of small size, high thermal efficiency, stable performance, strong adaptability, and low failure rate.

[0073] Preferably, the fuel cell system further includes an intercooler.

[0074] Wherein, the air inlet of the intercool...

Embodiment 3

[0109] Another embodiment of the present invention discloses a method for shutting down and purging the fuel cell system described in Embodiment 1 or 2, comprising the following steps:

[0110] S1. After receiving the shutdown command, control the input terminal 1 of the three-way valve 1 to open and the input terminal 2 to close;

[0111] S2. Start the water pump and heater until the temperature of the coolant inlet water of the stack rises to the threshold, and then turn off the heater;

[0112] S3. Control the air compressor to perform thermal purge on the stack and humidifier;

[0113] S4. After the purge is completed, the input terminal 1 of the control three-way valve 1 is closed, the input terminal 2 is opened, and the radiator is started until the water temperature at the inlet of the coolant drops to a set value, and the fuel cell system is shut down.

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Abstract

The invention provides a fuel cell system, belongs to the technical field of fuel cells, and solves the problems that a humidifier and an electric pile cannot be effectively purged and mechanical damage of a membrane cannot be caused in the prior art. The system comprises an electric pile, an air compressor, a water pump, a heater, a radiator, a humidifier, a three-way valve I and a controller, wherein the air inlet of the electric pile is connected with the air compressor through the humidifier, a cooling liquid inlet is connected with the output end of the three-way valve I, a cooling liquid outlet is connected with the inlet of the water pump, and the outlet of the water pump is connected with the first input end of the three-way valve I through the heater and connected with the second input end of first three-way valve I through the radiator. According to the invention, after a shutdown instruction is received, a controller controls a cooling liquid to be heated through small circulation until the water temperature of a cooling liquid inlet of an electric pile rises to a threshold value, and a heater is turned off; an air compressor is controlled to perform hot purging on the electric pile and a humidifier; and after purging is finished, the cooling liquid is controlled to carry out large circulation for heat dissipation until the water temperature of the cooling liquid inlet is reduced to a set value, and the fuel cell system is closed.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell system and a shutdown purging method thereof. Background technique [0002] There are hydrogen pipes and air pipes inside the proton exchange membrane fuel cell. The hydrogen and the oxygen in the air react inside the stack to generate water as a by-product and obtain electrical energy. The resulting water exits the fuel cell along with the tail gas. [0003] With the development of fuel cell technology, the power of the fuel cell system device has reached more than 120 kW, the volume of the humidifier is also getting larger, and the time for purging the humidifier is getting longer and longer. Moreover, if the fuel cell is not fully purged in a working environment below 0 °C, it will cause damage to the stack and humidifier. [0004] Due to the different working environment of the fuel cell and the different working conditions of the fuel cell, the humidity of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04007H01M8/04014H01M8/04029H01M8/04119H01M8/04228H01M8/04303H01M8/0432H01M8/04537H01M8/04701
CPCH01M8/04126H01M8/04029H01M8/04037H01M8/04014H01M8/04723H01M8/04358H01M8/04552H01M8/04649H01M8/04228H01M8/04303Y02E60/50
Inventor 王伟强赵兴旺刘然高云庆李飞强
Owner BEIJING SINOHYTEC
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