CN215988866U

CN215988866U - Fuel cell stack gas tightness detecting system

Info

Publication number: CN215988866U
Application number: CN202122000101.7U
Authority: CN
Inventors: 匡德志; 邸志岗; 王唤成; 杨锦夫
Original assignee: Shanghai Yunliang New Energy Technology Co ltd
Current assignee: Shanghai Yunliang New Energy Technology Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-03-08
Anticipated expiration: 2031-08-24

Abstract

The utility model discloses a fuel cell stack air tightness detection system in the technical field of fuel cell stack production, which comprises a bearing part, a detection part and a detection part, wherein the bearing part is used for bearing a to-be-detected stack; and the gas supply device is used for conveying second gas for displaying the position of the leakage point to the inside of the to-be-detected electric pile, and the second gas has the temperature or color different from the first gas outside the to-be-detected electric pile. The gas tightness detection device comprises a bearing part, a gas supply device, a gas distribution device and a gas distribution device.

Description

Fuel cell stack gas tightness detecting system

Technical Field

The utility model relates to the technical field of fuel cell stack production, in particular to a fuel cell stack airtightness detection system.

Background

In recent years, fuel cell technology has been developed and advanced, and has entered into various fields such as transportation and new energy power generation, which is the main direction of hydrogen energy application. Particularly, after ideas and targets such as carbon peak reaching, carbon neutralization and the like are provided recently, higher and faster requirements are provided for the demand of new energy and the progress speed of the new energy. Fuel cells are becoming increasingly important in this process and are considered essential means of achieving carbon peaking and carbon neutralization. The power generation by new energy sources such as photovoltaic, wind energy and the like is an excellent pollution-free energy source, but the influence on the fluctuation of a power grid is large, a large amount of energy waste such as light abandonment and wind abandonment occurs, the wasted electric energy is used for preparing hydrogen and then is supplied to a fuel cell, the optimal utilization of energy can be realized, carbon and other pollutants cannot be generated in the whole process, and the energy generation mode is considered to be an ideal energy mode in the future. The importance of fuel cell stacks as components for the conversion of chemical energy to electrical energy is becoming more and more significant in this process.

The fuel cell stack is formed by stacking several hundreds of bipolar plates and membrane electrodes, and the stack must have good sealing characteristics, and once sealing leakage occurs, the performance of the fuel cell is seriously affected, and the service life of the fuel cell is reduced. The traditional galvanic pile sealing inspection is to firstly fill high-pressure gas and then judge the leakage condition of the galvanic pile by detecting leakage amount or special gas such as helium, and the method has the defects of long detection time, high cost and incapability of realizing accurate positioning of leakage points; or the water detection mode is adopted to determine the leakage point, so that the efficiency is low and the accuracy is poor.

Disclosure of Invention

In view of the above, the present invention provides a fuel cell stack gas tightness detection system to solve the technical problems of long detection time and inaccurate leak position in the existing stack detection method.

The technical scheme adopted by the utility model is as follows: a fuel cell stack gas tightness detection system, comprising:

the bearing part is used for bearing the electric pile to be detected;

and the gas supply device is used for conveying second gas for displaying the position of the leak point to the inside of the to-be-detected electric pile, and the second gas has the temperature or color different from the first gas outside the to-be-detected electric pile.

Preferably, the system further comprises a closed chamber, the bearing part is arranged in the closed chamber, and the whole closed chamber is filled with the first gas.

Preferably, the closed chamber is a constant temperature chamber, and a far infrared thermal imager for detecting the position of the leakage point of the to-be-detected galvanic pile is arranged in the constant temperature chamber.

Preferably, the temperature of the second gas is greater than or less than the temperature of the first gas.

Preferably, the temperature of the second gas is-30 ℃ to 100 ℃.

Preferably, the second gas is a single gas or a mixed gas of air, hydrogen, helium and nitrogen;

preferably, the system further comprises a gas flow testing device for detecting whether the to-be-detected galvanic pile leaks, a gas supply pipeline is arranged between the gas supply device and the to-be-detected galvanic pile, and the gas flow testing device is arranged on the gas supply pipeline.

Preferably, the bearing part is an adjustable test support suitable for various types of galvanic piles to be detected; the adjustable test support is of a frame type structure.

Preferably, the second gas is a fluorescent gas.

Preferably, the second gas is a coloured gas.

The utility model has the beneficial effects that:

the gas tightness detection device comprises a bearing part, a gas supply device, a gas distribution device and a gas distribution device.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The reference numbers in the figures illustrate:

10-a carrier part;

20-an air supply device;

30-far infrared thermal imager;

40-sealing the bin;

50-gas flow test device;

60-an air supply pipeline;

70-detecting the galvanic pile.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Example 1, as shown in fig. 1, a fuel cell stack gas tightness detection system for gas tightness detection of a stack and accurate positioning of leak point positions; the system comprises:

the bearing part 10, the bearing part 10 is used for supporting and fixing the electric pile 70 to be detected;

the gas supply device 20 is connected with the gas inlet of the to-be-detected electric pile 70 through a gas supply pipeline 60; the gas supply device 20 is used for supplying a second gas for displaying the position of the leak point to the inside of the to-be-detected stack 70, and the second gas has a temperature or a color different from that of the first gas outside the to-be-detected stack 70, so that the second gas is a visible gas compared with the first gas.

The galvanic pile 70 to be detected is supported and fixed through the bearing part 10, and then the visual second gas is conveyed to the inside of the galvanic pile 70 to be detected through the gas supply device 20, so that the detection of the gas tightness of the galvanic pile 70 to be detected and the accurate positioning of the leakage point position are realized through the visual second gas leaked from the galvanic pile 70 to be detected to the surrounding first gas.

In one embodiment, as shown in fig. 1, the system further includes a sealed chamber 40, the carrying portion 10 and the gas supply device 20 are disposed in the sealed chamber 40, and the first gas fills the sealed chamber 40. By the arrangement, a place is provided for the air tightness test of the galvanic pile through the seal chamber 40, the influence of the surrounding environment on the air tightness test can be reduced, and the accuracy of the air tightness test is ensured.

In a specific embodiment, as shown in fig. 1, the closed chamber 40 is a constant temperature chamber, and a far infrared thermal imager 30 for detecting the position of the leakage point of the to-be-detected galvanic pile 70 is arranged in the constant temperature chamber; and the temperature of the second gas is greater than or less than the temperature of the first gas. So set up, earlier provide the place for galvanic pile gas tightness detection through the constant temperature storehouse, reduce the influence that the surrounding environment detected to the gas tightness, 360 thermal imaging is carried out to the surface that treats measuring galvanic pile 70 to six or a plurality of far infrared thermal imaging appearance 30 of rethread setting on treating measuring galvanic pile 70, down, left and right, preceding and rear side, utilize the distribution condition of the temperature difference who treats measuring galvanic pile 70 and surrounding environment, judge whether the galvanic pile leaks, and accurately judge the leak site position of leaking the galvanic pile through the temperature flow in the thermal imaging. The constant temperature bin provides a galvanic pile test temperature environment, physical isolation between the test environment and the surrounding space is achieved, the influence of the environment on the test result is reduced, and the test precision is improved. The constant temperature bin adopts the mode of uniform temperature distribution, ensures the uniformity of the temperature of each area, and the more consistent the temperature of the constant temperature bin is, the more accurate the test result of the galvanic pile is.

Preferably, the second gas should be at a high temperature and the thermostatic chamber at a low temperature.

Preferably, the second gas is a single gas or a mixed gas of air, hydrogen, helium and nitrogen with the temperature of-30-100 ℃.

In a specific embodiment, as shown in fig. 1, the system further includes a gas flow rate testing device 50 for detecting whether the to-be-detected stack 70 leaks, wherein the gas flow rate testing device 50 is disposed on the gas supply pipeline 60, and determines whether the to-be-detected stack 70 leaks according to changes of pressure and flow rate of the second gas in the gas supply pipeline 60. So set up, treat the gas tightness that detects the galvanic pile 70 through gas flow testing arrangement 50 to carry out mutual evidences with the infrared image that treats galvanic pile 70, judge whether treat that detects galvanic pile 70 takes place to leak, the accurate leakage point position who leaks galvanic pile that judges of rethread temperature flow in the infrared image. Meanwhile, the gas supply device 20 is combined with the gas flow testing device 50 to supply the high-pressure second gas, and after the high-pressure second gas fills the electric pile 70 to be detected, whether the electric pile 70 to be detected leaks can be judged according to the change of the pressure and the flow, and whether the electric pile 70 to be detected leaks can be found by using a special gas detector.

In one embodiment, as shown in fig. 1, the supporting portion 10 is an adjustable testing stand suitable for various types of the electric pile 70 to be tested, and the adjustable testing stand is a frame-type structure. So set up, can make this system be applicable to the gas tightness of various specification galvanic piles and detect, the while is adjusted formula test support and is adopted frame rack structure, can reduce the area of contact who waits to detect galvanic pile 70 and load-bearing part 10, and then reduces the influence to the measuring accuracy.

In one embodiment, as shown in FIG. 1, the second gas is a fluorescent gas or a colored gas. With the arrangement, by conveying the fluorescent gas or the colored gas to the inside of the electric pile 70 to be detected, the position of the leakage point of the electric pile can be accurately positioned through the flow of the visualized fluorescent gas or colored gas.

Embodiment 2, a fuel cell stack gas tightness detection method, includes the following steps:

s1: fixing the electric pile 70 to be detected on the adjustable test bracket, and connecting the air supply device 20 with the air inlet of the electric pile 70 to be detected through the air supply pipeline 60; starting the gas supply device 20 and delivering the colored gas or the fluorescent gas to the inside of the electric pile 70 to be detected until the electric pile 70 to be detected is filled with the colored gas or the fluorescent gas;

s2: checking whether colored gas or fluorescent gas leaks from the outer surface of the electric pile 70 to be detected;

s3: if yes, determining the position of the leaking point according to the leaking position of the colored gas or the fluorescent gas; if not, the air tightness of the galvanic pile 70 to be detected is good.

Embodiment 3, a fuel cell stack gas tightness detection method, includes the following steps:

s1: fixing the electric pile 70 to be detected on the adjustable test bracket, and connecting the air supply device 20 with the air inlet of the electric pile 70 to be detected through the air supply pipeline 60; starting the gas supply device 20 to convey a second gas at-30-100 ℃ to the inside of the to-be-detected electric pile 70 in the constant temperature bin, wherein the temperature of the second gas is higher than or lower than the constant temperature of the constant temperature bin;

s2: acquiring infrared images of the outer surfaces (six surfaces) of the galvanic pile 70 to be detected by a far infrared thermal imager 30;

s3: whether the pressure and the flow of the second gas in the gas supply pipeline 60 change or not is detected by the gas flow testing device 50 arranged on the gas supply pipeline 60 so as to judge whether a leak point exists in the to-be-detected electric pile 70 or not.

S4: if the leakage point exists in the galvanic pile 70 to be detected, accurately judging the position of the leakage point of the galvanic pile according to the temperature flow in the infrared image; if the electric pile 70 to be detected has no leak point, the air tightness of the electric pile 70 to be detected is good.

Compared with the prior art, the application has at least the following beneficial technical effects:

1. the method effectively solves the problems that the traditional galvanic pile leakage inspection is low in production takt and cannot quickly and accurately determine the leakage point; the method combines the high-pressure gas leakage amount test and the far infrared image test, realizes mutual verification of the leakage test, and has more accurate result; meanwhile, the position of a leakage point can be accurately found through leakage temperature flow imaging, qualitative, quantitative and positioning judgment of leakage is realized, the detection precision and accuracy are greatly improved, and the test and production efficiency is improved.

2. This application adopts the leakage flow test to combine together with the pile far infrared imaging test mode, has realized the qualitative and quantitative measurement of leaking the volume to and the accurate location of leakage point. The method has the characteristics of simple structure, rigorous design and low requirement on the technical level of field operators, realizes the improvement of the test efficiency while keeping the advantages of the traditional method, and solves the industrial problem that the leakage point is difficult to determine.

3. This application has realized the progress of fuel cell pile gas tightness inspection and leakage point accurate positioning technique, introduces far-infrared thermal imaging and image analysis technique to fuel cell pile gas tightness detection device, is convenient for realize the dual judgement that the pile leaked, improves and judges the precision, realizes simultaneously that the accurate synchronization of leakage point confirms, has eliminated follow-up loaded down with trivial details, complicated leakage point water and has examined etc. and survey, effectively improves production efficiency.

4. The method uses a far infrared thermal imaging technology to check the leakage and the leakage point of the galvanic pile, wherein the leakage check can be mutually verified with the gas leakage flow check; the far infrared thermal imager is used for monitoring 360-degree dead angles of the galvanic pile, a mathematical model is established, the temperature change of the surrounding environment of the galvanic pile is captured abnormally, the galvanic pile leakage can be judged when the leakage temperature flow is found, and then the accurate positioning of a leakage point is realized through the thermal imaging image positioning system.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A fuel cell stack gas tightness detection system, comprising:

the bearing part (10), the bearing part (10) is used for bearing the galvanic pile (70) to be detected;

the gas supply device (20) is used for conveying a second gas for displaying the position of the leakage point to the interior of the galvanic pile (70) to be detected, and the second gas has a temperature or a color different from that of the first gas outside the galvanic pile (70) to be detected.

2. The fuel cell stack gas tightness detection system according to claim 1, further comprising a sealing chamber (40), wherein the bearing portion (10) is disposed in the sealing chamber (40), and the first gas fills the entire sealing chamber (40).

3. The fuel cell stack airtightness detection system according to claim 2, wherein the closed chamber (40) is a constant temperature chamber, and a far infrared thermal imager (30) for detecting a leak point position of the stack (70) to be detected is arranged in the constant temperature chamber.

4. The fuel cell stack gas tightness detection system according to claim 3, wherein the temperature of the second gas is greater than or less than the temperature of the first gas.

5. The fuel cell stack gas tightness detection system according to claim 4, wherein the temperature of the second gas is-30 ℃ to 100 ℃.

6. The fuel cell stack gas tightness detection system according to claim 5, wherein the second gas is a single gas selected from air, hydrogen, helium and nitrogen.

7. The fuel cell stack gas tightness detection system according to any one of claims 1 to 6, characterized in that the system further comprises a gas flow rate test device (50) for detecting whether the stack (70) to be detected leaks, a gas supply pipeline (60) is arranged between the gas supply device (20) and the stack (70) to be detected, and the gas flow rate test device (50) is arranged on the gas supply pipeline (60).

8. The fuel cell stack gas tightness detection system according to claim 1, wherein the bearing part (10) is an adjustable test support suitable for various types of the stacks (70) to be detected; the adjustable test support is of a frame type structure.

9. The fuel cell stack gas tightness detection system according to claim 1, wherein the second gas is a fluorescent gas.

10. The fuel cell stack gas tightness detection system according to claim 1, wherein the second gas is a colored gas.