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System and method for improving gas flow control lag of fuel cell

A gas flow, fuel cell technology, applied in fuel cells, electrical components, circuits, etc., can solve problems such as unfavorable control, increase insulation volume, cylinder power consumption, etc., to improve accuracy and response speed, and reduce the impact of dead volume , reducing the effect of gas hunger

Pending Publication Date: 2021-08-20
大连锐格新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increased cylinder not only consumes power and increases the complexity of equipment hardware, but also the temperature control of the cylinder will affect the humidification management, avoiding condensation will increase the insulation volume, which is not conducive to control
[0011] Patent authorization CN108598527B discloses a method of improving the response speed of gas supply, which is to improve the output characteristics of the battery by increasing the excess coefficient when the output power increases, and ensure sufficient gas volume in advance. The method does not establish a direct correspondence between current output and hydrogen supply , cannot be used to detect fundamental performance issues during battery transient conditions during changes
[0012] Patent Publication CN111525155A uses liquid storage tank circulation to provide temperature regulation for the bubbling humidifier, providing stability of humidification temperature and rapid change of humidification temperature, but does not consider the relationship between the gas flow controller and the stack inlet flow difference

Method used

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  • System and method for improving gas flow control lag of fuel cell
  • System and method for improving gas flow control lag of fuel cell
  • System and method for improving gas flow control lag of fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A system for improving fuel cell gas flow control hysteresis, consisting of a gas source 1, a water supply source 5, a bubbling humidifier 8, and related control components and pipelines; the gas source 1 is decompressed by a pressure reducer 2, and the flow rate is controlled The device 3 controls the flow rate and the air supply valve 4, and sends it to the bubbling humidifier 8 for humidification; the water replenishment water source 5 is controlled by the water replenishing metering pump 6, and when necessary, the bubbling humidifier 8 is replenished with water, and the pressure of the water replenishing metering pump 6 is greater than that of the drum The highest pressure of the bubble humidifier 8, open the replenishment valve 7, and replenish water into the bubble humidifier 8; the bubble humidifier 8 is connected with a gas inlet 9, an air supply valve 4, a drain valve 10, a safety valve 19, an exhaust valve Valve 20, battery air supply valve 21, with a bubbling ...

Embodiment 2

[0055] The difference from Example 1 is that the spray humidification method is adopted.

[0056] The inside of the spray humidifier 28 is provided with a spray inner heater 31, which heats the gas and the sprayed water, so that the gas can be humidified by water vapor, and the gas humidification reaches the humidification temperature. The heater can also be set as an external circulation heater. The partition 33 divides the spraying and defoaming into two spaces. These two spaces are front and rear or down and up according to the airflow direction. The airflow first passes through the spraying space and then through the defoaming space. The partition 33 is higher than the water surface. The gas reaches the demisting space from the spraying space between the partition 33 and the water surface. The spray pump 29 conveys water for circulation and spraying. The circulating water flows through the spray external heater 30, sprays fine water droplets from the spray nozzle 32 and e...

Embodiment 3

[0058] The system tests the battery, including cold and hot starts. see Figure 4 , for the above system, the present invention improves fuel cell gas flow control hysteresis method, as follows:

[0059] Step S001: Judging whether to measure the system dead volume parameter; if the judgment result is "yes", proceed to step S010; if the judgment result is "no", proceed to step S002;

[0060] (1) When measuring the system dead volume parameter, carry out the following steps:

[0061] Step S010: Do not heat, close the air supply valve 4 without supplying air, close the exhaust valve 20, open the drain valve 10, discharge water from the drain port 11, and control the flow controller 3 to supply air to the humidifier according to the measured value of the pressure sensor 17 , maintain the uniform flow rate of gas supply, keep the pressure at 0.001 ~ 0.01MPag, when the detected gas pressure drops suddenly, close the drain valve 10, close the gas supply valve 4 to stop the gas supp...

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Abstract

The invention belongs to the field of fuel cell testing, discloses a system and a method for improving gas flow control lag of a fuel cell, and aims to solve the problem of transient data difference, namely flow lag, between a gas supply flow and an actual gas receiving flow of an electric pile in dynamic testing of the fuel cell. According to the invention, the accuracy and response speed of gas flow supply can be improved, and particularly for small-flow testing, the problem of buffer lag of process components of gas supply management is reduced so that the flexibility of a test design and the authenticity of test results are improved, hunger can be reduced, and the safety of the cell under test conditions is improved. According to the invention, deeper technical support is provided for dynamic operation and test research of the cell.

Description

technical field [0001] The invention belongs to the field of fuel cell testing, in particular to a system structure and an operating method for improving dynamic accuracy for the operation of hydrogen proton exchange membrane fuel cells, especially the gas supply for battery testing. Background technique [0002] In the operation of proton exchange membrane fuel cells, especially in cell testing, the gas entering the stack is usually pre-humidified, and the gas flow is first metered by dry gas, then enters the humidification, and then enters the cell. Its humidification generally adopts bubbling, spraying, steam or membrane exchange, etc., and most of them are carried out at a continuous specified temperature, and the temperature change rate is lower than the flow rate or pressure change rate. [0003] see figure 1 In actual work, it is found that, especially in small-scale tests, the process dead volume before the gas enters the battery has a more obvious buffer hysteresis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04089H01M8/04119H01M8/0438H01M8/04746
CPCH01M8/04089H01M8/04126H01M8/04388H01M8/04395H01M8/04753Y02E60/50
Inventor 高鹏盛武林李昕
Owner 大连锐格新能源科技有限公司
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