A device for detecting leaks in a stack of membrane electrodes

Abstract

The application provides a kind of stack membrane electrode leak detection device, for the stack membrane electrode plate leak detection, the stack membrane electrode plate is provided with first chamber and two groups of second chamber, the first chamber includes upper chamber and lower chamber, the device includes: vacuum box, clamp, leak detection pipeline, first connecting pipeline, second connecting pipeline, valve group, leak detector and vacuum pump for chamber vacuumizing;The leak detection pipeline is communicated with one of the second chamber, the upper chamber and the lower chamber in the vacuum box;The second connecting pipeline is communicated with the lower chamber and two groups of the second chamber through the clamp respectively;The valve group includes several valves to control the first connecting pipeline, the second connecting pipeline and the leak detection pipeline on-off.The stack membrane electrode leak detection device of the application can simultaneously detect the internal micro-leakage of multiple chambers relative to multiple chambers and the external leakage of multiple chambers, and can quickly detect the membrane electrode plate.

Description

Technical Field

[0001] This invention relates to the field of vacuum leak detection technology, and more specifically to a plug-in membrane electrode leak detection device. Background Technology

[0002] The membrane electrode assembly (MEA) is the "chip" of a proton exchange membrane fuel cell, the site of electrochemical reactions, and a core component of fuel cell technology.

[0003] The membrane electrode plate needs to be leak-tested to ensure a good seal. During leak testing, internal leaks need to be checked in pairs between cavities, and then external leaks need to be checked in these cavities simultaneously. Existing equipment requires leak testing of each internal cavity individually, which results in low leak testing efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a leak detection device for electrode stack membrane electrodes.

[0005] An embodiment of the present invention provides a leak detection device for a film electrode stack, which is used to detect leaks in a film electrode stack. The film electrode stack is provided with a first chamber and a plurality of second chambers surrounding the first chamber. The first chamber includes an upper chamber and a lower chamber that are spaced apart from each other. The second chambers include a group of second chambers A and a group of second chambers B. The two groups of second chambers are arranged at intervals along the direction surrounding the first chamber. The leak detection device for the film electrode stack includes: a vacuum chamber, a clamp, a leak detection pipe, a first connecting pipe, a second connecting pipe, a valve group, a leak detector, and a vacuum pump.

[0006] The clamp is disposed inside the vacuum chamber and is used to fix the electrode plate and seal the first chamber and the second chamber.

[0007] The leak detection pipe passes through the clamp and connects the interior of the vacuum chamber with the second chamber of group B, the upper chamber, and the lower chamber;

[0008] The detectable medium source is connected to the second connecting pipe through the first connecting pipe, and the second connecting pipe passes through the clamp and is connected to the lower chamber and the two sets of the second chambers respectively.

[0009] The valve group includes a first valve, a second valve, a third valve, a fourth valve, and a fifth valve. The first valve controls the connection between the first connecting pipe and the lower chamber. The second valve controls the connection between the first connecting pipe and the second chamber of group A. The third valve controls the connection between the first connecting pipe and the second chamber of group B. The fourth valve controls the connection between the leak detection pipe and the second chamber of group B. The fifth valve controls the connection between the leak detection pipe and the lower chamber.

[0010] The leak detector is connected to the inside of the vacuum chamber and is used to detect the detectable medium source;

[0011] The vacuum pump is connected to the first connecting pipe.

[0012] Compared with the prior art, the electrode stack membrane electrode leak detection device of the present invention can simultaneously detect internal microleakage of multiple chambers and external leakage of multiple chambers, enabling rapid leak detection of the membrane electrode plate and improving leak detection efficiency.

[0013] Furthermore, the electrode stack membrane electrode leak detection device also includes a large leak detection gas source and a pressure measuring device;

[0014] The large leak detection gas source is connected to the first connecting pipe;

[0015] The pressure measuring device is connected to the second chamber and the lower chamber via the second connecting pipe. By filling the cavities of the electrode plate with gas at a set pressure, the pressure measuring device is used to pre-detect large leaks in each cavity of the workpiece using the pressure drop method, quickly removing obviously unqualified workpieces and improving detection efficiency.

[0016] Furthermore, the large leak detection gas source is a dry gas source or a nitrogen source. Dry gas sources or nitrogen sources are easy to obtain and discharge.

[0017] Furthermore, three pressure measuring devices are provided, and these three pressure measuring devices are respectively connected to the two sets of second chambers and the lower chamber via the second connecting pipe. The one-to-one correspondence of the pressure measuring devices can accelerate the detection rate of large leaks.

[0018] Furthermore, the second connecting pipe includes a main pipe and three branch pipes, the main pipe being connected to the branch pipes, and the three branch pipes respectively passing through the clamp and communicating with the lower chamber and the two sets of the second chamber;

[0019] The first valve, the second valve, and the third valve each control the opening and closing of one of the branch pipes.

[0020] Furthermore, the clamp includes a first clamping plate and a second clamping plate, which are used to clamp the electrode plate and respectively close the openings at both ends of the first chamber and the second chamber;

[0021] The second connecting pipe passes through the first clamp and communicates with the two sets of second chambers and the lower chamber. The leak detection pipe passes through the second clamp and communicates the interior of the vacuum chamber with the B set of second chambers, the upper chamber and the lower chamber.

[0022] Compared to existing technologies, the electrode stack membrane electrode leak detection device of the present invention can simultaneously detect internal micro-leaks in multiple chambers and external leaks in multiple chambers, enabling rapid leak detection of the membrane electrode plate and improving leak detection efficiency. Furthermore, by filling the cavities of the electrode stack membrane electrode plate with gas at a set pressure, and using a pressure measuring device to pre-detect large leaks in each cavity of the workpiece using the pressure drop method, obviously unqualified workpieces can be quickly rejected, improving detection efficiency. Furthermore, the large leak detection gas uses a dry gas source or nitrogen source that is easy to obtain and discharge. Furthermore, the large leak detection rate can be accelerated by using a one-to-one corresponding pressure measuring device.

[0023] Another embodiment of the present invention provides a leak detection method for a film electrode stack, used for leak detection of a film electrode stack plate. The film electrode stack plate is provided with a first chamber and a plurality of second chambers surrounding the first chamber. The first chamber includes an upper chamber and a lower chamber that are spaced apart from each other. The second chambers are divided into group A and group B. The two groups of second chambers are arranged at intervals along the direction surrounding the first chamber. The method includes the following steps:

[0024] S1: Place the electrode plate to be tested into the vacuum chamber, fix the electrode plate with a clamp, and seal the lower chamber and the second chamber;

[0025] S2: Evacuate the vacuum chamber, the lower chamber, and the second chamber to a set vacuum value; fill the second chamber of group A with a detectable medium to a set pressure value; connect the second chamber of group B, the upper chamber, and the lower chamber to the vacuum chamber; and detect the concentration of the detectable medium in the vacuum chamber.

[0026] S3: Disconnect the connection between the second chamber of group B and the vacuum chamber, evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber;

[0027] S4: Disconnect the lower chamber from the vacuum chamber, evacuate the detectable medium from the second chamber of group B, and then fill the lower chamber with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber;

[0028] S5: Evacuate the detectable medium from the lower chamber, fill the first chamber, the second chamber, and the vacuum box with air to atmospheric pressure, and remove the electrode plate.

[0029] Compared with the prior art, the leak detection method of the electrode stack membrane electrode of the present invention can simultaneously detect internal microleakage of multiple chambers and external leakage of multiple chambers, which can quickly detect leaks in the membrane electrode plate and improve the leak detection efficiency.

[0030] Furthermore, in S3, the connection between the second chamber of group B and the vacuum chamber is severed, and the detectable medium in the second chamber of group A is evacuated, including:

[0031] Disconnect the second chamber of group B from the vacuum chamber, then connect the second chambers of group A and group B until they reach pressure equilibrium. Evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the set pressure. The detectable medium is automatically filled into the next chamber to be tested using gas pressure, saving energy.

[0032] Furthermore, in S4, the connection between the lower chamber and the vacuum chamber is severed, and the detectable medium in the second chamber of group B is evacuated, including:

[0033] The connection between the lower chamber and the vacuum chamber is severed. The second chamber of group B and the lower chamber are then connected until they reach pressure equilibrium. The detectable medium in the second chamber of group B is evacuated, and then the lower chamber is filled with detectable medium to the set pressure value. The detectable medium is automatically filled into the next chamber to be tested by gas pressure, saving energy.

[0034] Furthermore, step S1 includes:

[0035] S1a: Place the electrode plate to be tested into the vacuum chamber, fix the electrode plate with a clamp, and seal the lower chamber and the second chamber;

[0036] S1b: Fill the second chamber and the lower chamber with leak detection gas to the set pressure value, and detect the pressure values ​​of the lower chamber and the second chamber. The chambers are quickly leak-detected using the pressure drop method.

[0037] Compared with the prior art, the leak detection method of the electrode stack membrane electrode of the present invention can simultaneously detect internal micro-leakage of multiple chambers and external leakage of multiple chambers, and can quickly detect leaks on the membrane electrode plate, thus improving the leak detection efficiency. Furthermore, the detectable medium is automatically filled into the next chamber to be tested by gas pressure, saving energy. Furthermore, the chamber can be quickly detected by pressure drop method.

[0038] To provide a clearer understanding of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a battery-supported membrane electrode leak detection device according to an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figure 1 This is a schematic diagram of a leak detection device for a film electrode stack according to an embodiment of the present invention. The leak detection device is used to detect leaks in a film electrode stack 80. The film electrode stack 80 is provided with a first chamber and a plurality of second chambers surrounding the first chamber. The first chamber includes an upper chamber and a lower chamber that are separated from each other. The second chambers include a group of second chambers A and a group of second chambers B. The two groups of second chambers are arranged at intervals along the direction surrounding the first chamber. The leak detection device for the film electrode stack includes: a vacuum chamber 10, a clamp 11, a leak detection pipe 12, a first connecting pipe 30, a second connecting pipe 40, a valve group, a leak detector 60, and a first vacuum pump 22.

[0042] The vacuum chamber 10 is connected to a second vacuum pump 15. The clamp 11 is disposed inside the vacuum chamber 10 to fix the electrode plate 80 and seal the first and second chambers. The leak detection pipe 12 passes through the clamp 11 to connect the interior of the vacuum chamber 10 with the second chamber of group B, the upper chamber, and the lower chamber. The detectable medium source 21 is connected to the second connecting pipe 40 through the first connecting pipe 30. The second connecting pipe 40 passes through the clamp 11 to connect with the lower chamber and the two groups of second chambers.

[0043] It should be noted that the clamp 11 can be designed according to the actual shape and structure of the electrode plate 80, ensuring that the electrode plate 80 is fixed and its chambers are sealed. In this embodiment, the clamp 11 includes a first clamping plate and a second clamping plate, which are used to clamp the electrode plate 80 and respectively close the openings at both ends of the first chamber and the second chamber; the second connecting pipe 40 passes through the first clamping plate and communicates with the two sets of second chambers and the lower chamber; the leak detection pipe 12 passes through the second clamping plate and communicates with the interior of the vacuum box 10 and the B set of second chambers, the upper chamber, and the lower chamber. It should be noted that the second chamber of the electrode plate 80 is actually divided into two groups to distinguish that the two groups of second chambers are connected to different second connecting pipes 40.

[0044] The valve group includes a first valve 51, a second valve 52, a third valve 53, a fourth valve 54, and a fifth valve 55. The first valve 51 controls the connection between the first connecting pipe 30 and the second chamber of group A; the second valve 52 controls the connection between the first connecting pipe 30 and the second chamber of group B; the third valve 53 controls the connection between the first connecting pipe 30 and the lower chamber; the fourth valve 54 controls the connection between the leak detection pipe 12 and the second chamber of group B; and the fifth valve 55 controls the connection between the leak detection pipe 12 and the lower chamber. It should be noted that the upper chamber is always connected to the vacuum chamber 10.

[0045] In some embodiments, the second connecting pipe 40 includes a main pipe and three branch pipes. The main pipe is connected to the branch pipes, and the three branch pipes pass through the clamp 11 and communicate with the lower chamber and the two sets of second chambers, respectively. The first valve 51, the second valve 52, and the third valve 53 control the opening and closing of one of the branch pipes, and the first connecting pipe 30 is connected to the main pipe.

[0046] The leak detector 60 is connected to the inside of the vacuum chamber 10 and is used to detect the detectable medium source 21; the first vacuum pump 22 is connected to the first connecting pipe 30.

[0047] To accelerate the detection speed, preliminary testing is performed on the electrode plate 80 beforehand. In some embodiments, a large leak detection gas source 71 and a pressure measuring device 72 are also included. The large leak detection gas source 71 is connected to the first connecting pipe 30. The pressure measuring device 72 is connected to the second chamber and the lower chamber through the second connecting pipe 40. Preferably, three pressure measuring devices 72 are provided, and the three pressure measuring devices 72 are respectively connected to two sets of the second chambers and the lower chamber through the second connecting pipe 40. Each pressure measuring device 72 is responsible for detecting one set of the second chambers or the lower chamber, reducing the trouble of each pressure measuring device 72 needing to be connected to different chambers for individual detection. When the second connecting pipe 40 includes a main pipe and three branch pipes, each pressure measuring device 72 is connected to one branch pipe, and the first connecting pipe 30 is connected to the main pipe. Preferably, the large leak detection gas source 71 is a dry gas source or a nitrogen source. Of course, since the leak detection method uses the pressure drop method to detect large leaks, other inert gas sources 14 can also be selected as the large leak detection gas source 71. In addition, in this embodiment, the leak detection pipe 12 connected to the lower chamber is connected to the second connecting pipe corresponding to the lower chamber to avoid multiple pipes passing through the clamp; the leak detection pipe 12 connected to the second chamber of group B is connected to the second connecting pipe corresponding to chamber B to avoid multiple pipes passing through the clamp and affecting the airtightness.

[0048] In some embodiments, the above-mentioned electrode pad leak detection device further includes an inert gas source 14 connected to the interior of the vacuum chamber 10. This source maintains the vacuum level inside the vacuum chamber 10. Since air also contains helium, hydrogen, oxygen, carbon dioxide, etc., filling the vacuum chamber 10 with inert gas after evacuation avoids the influence of these detectable media present in the air, ensuring the detection accuracy of the instrument. In this embodiment, the inert gas source 14 is a nitrogen source.

[0049] In some embodiments, the above-mentioned electrode stack membrane leak detection device further includes a gas recovery component 24 connected to the first connecting pipe 30 for recovering the detectable medium, thus saving costs. Of course, the detectable medium can also be discharged directly without recovery.

[0050] In some embodiments, the above-mentioned electrode stack leak detection device further includes a vacuum measuring device 13 communicating with the inside of the vacuum chamber 10, for detecting the vacuum level inside the vacuum chamber 10.

[0051] Because the amount of gas used for large leak detection is relatively large, in order to reduce noise when venting the leaking gas, in some embodiments, the above-mentioned electrode film detector further includes an exhaust mechanism 23. The exhaust mechanism 23 is connected to the first connecting pipe 30. After the large leak detection is completed, the large leak detection gas is discharged through the exhaust mechanism 23 by opening the first valve 51, the second valve 52, and the third valve 53. The exhaust mechanism 23 includes an exhaust pipe connected to the first connecting pipe 30 and a silencer installed at the end of the exhaust pipe. In addition, another exhaust mechanism 23 can be provided, which is connected to the inside of the vacuum chamber 10. This exhaust mechanism 23 is used when restoring the vacuum chamber 10 to atmospheric pressure after the detection is completed, thereby reducing the noise when filling the vacuum chamber 10 with air.

[0052] The above describes the leak detection device for electrode stacks provided in this application. This application also provides a leak detection method for electrode stacks, which can be applied to the aforementioned leak detection device for leak detection of an electrode stack plate 80. The electrode stack plate 80 is provided with a first chamber and a plurality of second chambers surrounding the first chamber. The first chamber includes an upper chamber and a lower chamber separated from each other. The second chambers are divided into group A and group B, and the two groups of second chambers are arranged alternately along the direction surrounding the first chamber. It should be noted that the number of second chambers is even; in this embodiment, six second chambers are used. The method includes the following steps:

[0053] S1: Place the electrode plate 80 to be tested into the vacuum chamber 10, fix the electrode plate 80 with the clamp 11, and seal the lower chamber and the second chamber.

[0054] S2: Evacuate the vacuum chamber 10, the first chamber, and the second chamber to the set vacuum value; fill the second chamber of group A with a detectable medium to the set pressure value; connect the second chamber of group B, the upper chamber, and the lower chamber to the vacuum chamber 10, and detect the concentration of the detectable medium in the vacuum chamber 10. If the concentration of the detectable medium in the vacuum chamber 10 does not exceed the set value, the detection of the second chamber of group A to the second chamber of group B, the upper chamber, and the lower chamber is qualified, and the external leakage of the second chamber of group A is qualified. This step can quickly detect internal micro-leakage between adjacent second chambers and internal micro-leakage of half of the second chambers relative to the first chamber, reducing the step of checking for leaks one by one and speeding up the detection rate.

[0055] S3: Disconnect the connection between the second chamber of group B and the vacuum chamber 10, evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber 10; if the concentration of the detectable medium in the vacuum chamber 10 does not exceed the set value, then the internal microleakage detection between the second chamber of group B and the upper and lower chambers is qualified, and the external leakage detection of the second chamber of group B is qualified. This step can quickly detect the internal microleakage between the second chamber of group B and the first chamber.

[0056] S4: Disconnect the lower chamber from the vacuum chamber 10, evacuate the detectable medium from the second chamber of group B, and then fill the lower chamber with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber 10; if the concentration of the detectable medium in the vacuum chamber 10 does not exceed the set value, the micro-leakage detection of the upper and lower chambers is qualified, and thus, the detection of the electrode plate 80 of this electrode stack is qualified.

[0057] S5: Evacuate the detectable medium from the upper chamber, fill the first chamber, the second chamber, and the vacuum box 10 with air to atmospheric pressure, and remove the electrode plate 80.

[0058] To achieve energy saving and accelerate gas extraction, in some embodiments, in step S3, the connection between the second chamber of group B and the vacuum chamber 10 is cut off, and the detectable medium in the second chamber of group A is evacuated, including:

[0059] Disconnect the second chamber of group B from the vacuum chamber 10, connect the second chamber of group A and the second chamber of group B until the second chamber of group A and the second chamber of group B reach pressure balance, evacuate the detectable medium in the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value.

[0060] To achieve energy saving and accelerate gas extraction, in some embodiments, in step S4, the connection between the lower chamber and the vacuum chamber 10 is severed, and the detectable medium in the second chamber of group B is evacuated, including:

[0061] Disconnect the lower chamber from the vacuum chamber 10, connect the second chamber of group B and the lower chamber until the second chamber of group B and the lower chamber reach pressure balance, evacuate the detectable medium from the second chamber of group B, and then fill the lower chamber with the detectable medium to the pressure set value.

[0062] To accelerate the detection speed, the electrode plate 80 of the electrode stack is pre-tested. In some embodiments, step S1 includes:

[0063] S1a: Place the electrode plate 80 to be tested into the vacuum chamber 10, fix the electrode plate 80 with the clamp 11, and seal the lower chamber and the second chamber;

[0064] S1b: Fill the second chamber and the lower chamber with large leak detection gas to the pressure set value, and detect the pressure values ​​of the lower chamber and the second chamber; if the pressure values ​​of the second chamber and the lower chamber are lower than the set value, the large leak detection is unqualified, the detection ends, the vacuum chamber 10 is opened and the electrode plate 80 is taken out; if the pressure values ​​of the second chamber and the lower chamber are higher than the set value, the large leak detection is qualified, and proceed to step S2.

[0065] In the description of this invention, it should be understood that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention. In this invention, it is not limited to selecting the lower chamber to be connected to the second connecting pipe 40 for leak detection; the upper chamber can also be selected to be connected to the second connecting pipe 40 for leak detection.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak detection device for a film electrode stack, used for leak detection of a film electrode stack plate, wherein the film electrode stack plate is provided with a first chamber and a plurality of second chambers surrounding the first chamber, the first chamber including an upper chamber and a lower chamber spaced apart from each other, the second chambers being divided into group A and group B, the two groups of second chambers being arranged alternately along the direction surrounding the first chamber, characterized in that, The electrode stack membrane leak detection device includes: a vacuum box, a clamp, a leak detection pipe, a first connecting pipe, a second connecting pipe, a valve group, a leak detector, and a vacuum pump; The clamp is disposed inside the vacuum chamber and is used to fix the electrode plate and seal the first chamber and the second chamber. The leak detection pipe passes through the clamp and connects the interior of the vacuum chamber with the second chamber of group B, the upper chamber, and the lower chamber; The detectable medium source is connected to the second connecting pipe through the first connecting pipe, and the second connecting pipe passes through the clamp and is connected to the lower chamber and the two sets of the second chambers respectively. The valve group includes a first valve, a second valve, a third valve, a fourth valve, and a fifth valve. The first valve controls the connection between the first connecting pipe and the lower chamber. The second valve controls the connection between the first connecting pipe and the second chamber of group A. The third valve controls the connection between the first connecting pipe and the second chamber of group B. The fourth valve controls the connection between the leak detection pipe and the second chamber of group B. The fifth valve controls the connection between the leak detection pipe and the lower chamber. The leak detector is connected to the inside of the vacuum chamber and is used to detect the detectable medium source; The vacuum pump is connected to the first connecting pipe; The steps for leak detection of the film electrode plate of the fuel cell stack should include at least the following: The lower chamber and the second chamber are sealed, and the vacuum chamber, the lower chamber, and the second chamber are evacuated to a set vacuum value. The second chamber of group A is filled with a detectable medium to a set pressure value. The second chamber of group B, the upper chamber, and the lower chamber are connected to the vacuum chamber, and the concentration of the detectable medium in the vacuum chamber is detected. Disconnect the connection between the second chamber of group B and the vacuum chamber, evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber; The steps of disconnecting the second chamber of group B from the vacuum chamber and evacuating the detectable medium from the second chamber of group A include: disconnecting the lower chamber from the vacuum chamber, connecting the second chamber of group B and the lower chamber until the second chamber of group B and the lower chamber reach pressure balance, evacuating the detectable medium from the second chamber of group B, and then filling the lower chamber with the detectable medium to the pressure set value; It also includes a large leak detection gas source and a pressure measuring device; The large leak detection gas source is connected to the first connecting pipe; The pressure measuring device is connected to the second chamber and the lower chamber via the second connecting pipe.

2. The electrode stack membrane electrode leak detection device according to claim 1, characterized in that: The gas source for large leak detection is a dry gas source or a nitrogen source.

3. The electrode stack membrane electrode leak detection device according to claim 1, characterized in that: The pressure measuring device is provided in three parts, and the three pressure measuring devices are respectively connected to the two sets of the second chamber and the lower chamber through the second connecting pipe.

4. The electrode stack membrane electrode leak detection device according to claim 1, characterized in that: The second connecting pipe includes a main pipe and three branch pipes. The main pipe is connected to the branch pipes, and the three branch pipes pass through the clamp and communicate with the lower chamber and the two sets of second chambers, respectively. The first valve, the second valve, and the third valve each control the opening and closing of one of the branch pipes.

5. The electrode stack membrane electrode leak detection device according to claim 1, characterized in that: The clamp includes a first clamping plate and a second clamping plate, which are used to clamp the electrode plate and respectively close the openings at both ends of the first chamber and the second chamber. The second connecting pipe passes through the first clamp and communicates with the two sets of second chambers and the lower chamber. The leak detection pipe passes through the second clamp and communicates the interior of the vacuum chamber with the B set of second chambers, the upper chamber and the lower chamber.

6. A leak detection method for a film electrode stack, used for leak detection of a film electrode stack plate, characterized in that, The electrode plate has a first chamber and a plurality of second chambers surrounding the first chamber. The first chamber includes an upper chamber and a lower chamber that are separated from each other. The second chambers are divided into group A and group B. The two groups of second chambers are arranged alternately along the direction surrounding the first chamber. The method includes the following steps: S1: Place the electrode plate to be tested into the vacuum chamber, fix the electrode plate with a clamp, and seal the lower chamber and the second chamber; S2: Evacuate the vacuum chamber, the lower chamber, and the second chamber to a set vacuum value; fill the second chamber of group A with a detectable medium to a set pressure value; connect the second chamber of group B, the upper chamber, and the lower chamber to the vacuum chamber; and detect the concentration of the detectable medium in the vacuum chamber. S3: Disconnect the connection between the second chamber of group B and the vacuum chamber, evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber; S4: Disconnect the lower chamber from the vacuum chamber, evacuate the detectable medium from the second chamber of group B, and then fill the lower chamber with the detectable medium to the pressure set value; detect the concentration of the detectable medium in the vacuum chamber; S5: Evacuate the detectable medium from the lower chamber, fill the first chamber, the second chamber, and the vacuum box with air to atmospheric pressure, and remove the electrode plate.

7. A leak detection method according to claim 6, characterized in that, In S3, the connection between the second chamber of group B and the vacuum chamber is severed, and the detectable medium in the second chamber of group A is evacuated, including: Disconnect the second chamber of group B from the vacuum chamber, connect the second chamber of group A and the second chamber of group B until the second chamber of group A and the second chamber of group B reach pressure balance, evacuate the detectable medium from the second chamber of group A, and then fill the second chamber of group B with the detectable medium to the pressure set value.

8. A leak detection method according to claim 6, characterized in that, In S4, the connection between the lower chamber and the vacuum chamber is severed, and the detectable medium in the second chamber of group B is evacuated, including: Disconnect the lower chamber from the vacuum chamber, connect the second chamber of group B and the lower chamber until the second chamber of group B and the lower chamber reach pressure balance, evacuate the detectable medium from the second chamber of group B, and then fill the lower chamber with the detectable medium to the pressure set value.

9. A leak detection method according to claim 6, characterized in that, Step S1 includes: S1a: Place the electrode plate to be tested into the vacuum chamber, fix the electrode plate with a clamp, and seal the lower chamber and the second chamber; S1b: Fill the second chamber and the lower chamber with large leakage detection gas to the pressure set value, and detect the pressure values ​​of the lower chamber and the second chamber.

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