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Method and system for judging water state inside fuel cell based on impedance

A fuel cell and internal water technology, which is applied in the direction of fuel cells, fuel cell additives, circuits, etc., can solve the problems of inability to quickly and accurately judge the internal resistance of fuel cells, and cannot effectively identify the water state inside fuel cells, so as to improve the judgment Speed ​​and judgment accuracy, realize fast and accurate recognition, and improve the effect of recognition speed

Active Publication Date: 2019-02-15
BEIJING MECHANICAL EQUIP INST
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  • Claims
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Problems solved by technology

[0006] In view of the above analysis, the embodiment of the present invention aims to provide a method for judging the internal water state of the fuel cell based on impedance, so as to solve the problem of the inability to quickly and accurately judge the internal resistance of the fuel cell and the inability to effectively identify the water state inside the fuel cell in the prior art. status problem

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  • Method and system for judging water state inside fuel cell based on impedance
  • Method and system for judging water state inside fuel cell based on impedance
  • Method and system for judging water state inside fuel cell based on impedance

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Embodiment 1

[0057] In an embodiment of the present invention, a method for judging the state of water inside a fuel cell based on impedance is provided. The schematic flow chart of the method is as follows figure 1 As shown, it specifically includes the following steps:

[0058] Step S1, generating a high-frequency current disturbance or voltage disturbance signal to the fuel cell, collecting the voltage response and current disturbance of the fuel cell, calculating the ratio of the voltage response to the current response of the fuel cell, and obtaining the impedance;

[0059] In order to obtain the voltage response and current response of the fuel cell, the acquisition process can be figure 2 The fuel cell system is carried out, and the system includes a fuel cell, an impedance analyzer, a cooling water system, an air intake and exhaust system, a hydrogen intake and exhaust system, a humidification system and a control system;

[0060] The high-frequency current disturbance or voltage...

Embodiment 2

[0085] In another embodiment of the present invention, a system for judging the state of water inside a fuel cell based on impedance is provided. The structural schematic diagram of the system is as follows Figure 7 As shown, the system includes a fuel cell, an impedance analyzer and a control system;

[0086] The impedance analyzer is used to generate current disturbance and voltage disturbance signals, provide them to the fuel cell, collect the voltage response and current response of the fuel cell, and calculate the impedance through the voltage response and current response;

[0087] The impedance analyzer is also used to send the impedance to a control system, and the control system is used to judge whether the argument angle is within a set threshold range according to the argument angle of the impedance;

[0088] If not, send an instruction signal for adjusting the frequency of the disturbance signal to the impedance analyzer, and the impedance analyzer adjusts the fre...

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Abstract

The invention relates to a method and a system for judging a water state inside a fuel cell based on impedance, belongs to the technical field of fuel cells, and solves problems that an internal resistance of the fuel cell cannot be quickly and accurately judged in the prior art and the water state inside the fuel cell cannot be effectively identified. The method for judging the water state insidethe fuel cell based on impedance comprises the following steps: generating a current disturbance or voltage disturbance signal to the fuel cell; collecting a voltage response and a current response of the fuel cell; calculating a ratio of the voltage response to the current response to obtain the impedance; adjusting a frequency of the disturbance signal according to an argument of the impedance,so that the argument is within a set threshold range; judging that the impedance at the moment is the internal resistance of the fuel cell; and judging the water state inside the fuel cell accordingto the internal resistance of the fuel cell. The method and the system provided by the invention realize quick and accurate identification of the internal resistance of the fuel cell and effective identification of the water state inside the fuel cell.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method and system for judging the state of water inside a fuel cell based on impedance. Background technique [0002] With the gradual commercialization of proton exchange membrane fuel cells, its condition monitoring and related fault diagnosis have been paid more and more attention. Among them, the wetting state of the proton exchange membrane is very critical, and it can well reflect the water content in the membrane electrode. If the membrane electrode contains more water, the concentration loss of the battery will increase; if the membrane electrode contains less water, especially the proton exchange membrane, the proton conductivity will decrease, and the ohmic loss of the battery will increase. [0003] Electrochemical AC impedance spectroscopy can reflect the water content inside the fuel cell. The disadvantage is that the full frequency band test (generally sweepin...

Claims

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Application Information

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IPC IPC(8): H01M8/04029H01M8/04089H01M8/04828
CPCH01M8/04029H01M8/04089H01M8/04201H01M8/04828Y02E60/50
Inventor 李跃华马泽黄浩
Owner BEIJING MECHANICAL EQUIP INST
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