Shutdown purging method and device for fuel cell stack

A technology of fuel cell stacks and fuel cells, which is applied in the direction of fuel cells, circuits, electrical components, etc., and can solve problems such as failure to effectively eliminate modal water in proton exchange membranes

Active Publication Date: 2021-12-24
BEIJING SINOHYTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned analysis, the embodiment of the present invention aims to provide a method and device for shutting down and purging of ve

Method used

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  • Shutdown purging method and device for fuel cell stack
  • Shutdown purging method and device for fuel cell stack
  • Shutdown purging method and device for fuel cell stack

Examples

Experimental program
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Embodiment 1

[0064] One embodiment of the present invention discloses a method for shutting down and purging a vehicle-mounted fuel cell, such as figure 1 shown, including the following steps:

[0065] S1. Obtain the impedance range when the water content of the fuel cell is lower than the preset value at different ambient temperatures;

[0066] S2. After receiving the vehicle shutdown command from the user, monitor the ambient temperature at the current moment, and identify the impedance range when the water content of the fuel cell corresponding to the ambient temperature is lower than the preset value;

[0067] S3. Perform the first purging of the fuel cell stack, monitor the real-time high-frequency impedance of the stack during the purging process, until the real-time high-frequency impedance falls into the above-identified impedance range, stop purging, and record the first Second purge time;

[0068] S4. After stopping the purge for the preset time, monitor the ambient temperature...

Embodiment 2

[0072] Optimizing on the basis of Example 1, the step S1 further includes:

[0073] S11. Obtain data samples of fuel cell stacks including different ambient temperatures, impedances, and battery life;

[0074] S12. Fit the above data samples, and determine the function curve of ambient temperature-impedance-battery life by the best approximation method;

[0075] S13. Through the above function curve, determine the impedance range corresponding to the rated life to the maximum life of the fuel cell at each ambient temperature, as the impedance range when the water content is lower than the preset value.

[0076] Preferably, step S2 further includes:

[0077] S21. After receiving the vehicle shutdown command from the user, monitor the current ambient temperature through the temperature sensor arranged in the vehicle compartment;

[0078] S22. Identify the impedance range corresponding to the above ambient temperature when the water content is lower than the preset value, and o...

Embodiment 3

[0089] The present invention also discloses a vehicle-mounted fuel cell shutdown purging device corresponding to Embodiment 1, including data acquisition equipment, data analysis and control equipment, and actuators that are sequentially connected or wirelessly transmitted, such as figure 2 shown.

[0090] The data acquisition device is used to collect the real-time high-frequency impedance of the fuel cell stack and the ambient temperature in the vehicle compartment, and send them to the data analysis and control equipment.

[0091] The data analysis and control equipment is used to obtain the impedance range when the water content of the fuel cell is lower than the preset value under different ambient temperatures; The impedance range when the water content of the battery is lower than the preset value; the control actuator performs the first purge of the fuel cell stack, and monitors the real-time high-frequency impedance of the stack during the purge until the real-time h...

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Abstract

The invention provides a shutdown purging method of a vehicle-mounted fuel cell, belongs to the technical field of shutdown purging of fuel cell stacks, and solves the problem that modal water in a proton exchange membrane cannot be effectively eliminated in the prior art. The method comprises the steps of acquiring an impedance range when the water content of the fuel cell is lower than a preset value at different environment temperatures; after a whole vehicle shutdown instruction sent by a user is received, monitoring the environment temperature at the current moment, and recognizing the impedance range when the water content, which corresponds to the environment temperature, of the fuel cell is lower than a preset value; performing first purging on the fuel cell stack, monitoring the real-time high-frequency impedance of the stack in the purging process, stopping purging until the real-time high-frequency impedance falls into the recognized impedance range, and obtaining the first purging time; and after the purging is stopped for a preset time, monitoring the environment temperature again, continuously performing purging on the fuel cell stack until the last purging time reaches a specified threshold value, stopping the whole vehicle, and shutting down the fuel cell stack.

Description

technical field [0001] The invention relates to the technical field of shut-down purging of fuel cell stacks, in particular to a method and device for shutting down and purging of fuel cell stacks. Background technique [0002] When the fuel cell stack is shut down and purged, the water (modal water) absorbed in the proton exchange membrane is not easy to remove. The existence of this part of water makes the stack more likely to freeze during low-temperature storage and start-up, which will damage the battery structure , resulting in performance degradation of the stack. [0003] Most of the current purging methods are simple purging, and most of the purging strategies for monitoring high-frequency impedance to achieve closed-loop do not consider the influence of modal water in the proton exchange membrane. Contents of the invention [0004] In view of the above analysis, the embodiment of the present invention aims to provide a method and device for purging vehicle-mount...

Claims

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Application Information

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IPC IPC(8): H01M8/04119H01M8/04228H01M8/04303H01M8/0432H01M8/0438H01M8/04492H01M8/04537H01M8/04992
CPCH01M8/04179H01M8/04228H01M8/04303H01M8/0432H01M8/04649H01M8/04992H01M8/04507H01M8/04395Y02E60/50
Inventor 苗田伟赵兴旺王鹏方川
Owner BEIJING SINOHYTEC
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