Device for detecting electrochemical performance of PEM electrolytic cell

Abstract

The invention belongs to the technical field of PEM electrolytic cells, and particularly relates to a PEM electrolytic cell electrochemical performance detection device which comprises an electrolytic cell, a first test mechanism and a second test mechanism. The electrolytic bath comprises a base body, a hydrogen discharge pipe, a tee joint and a hydrogen storage tank connecting pipeline; the hydrogen discharging pipe is arranged on the base body, one end of the hydrogen discharging pipe is communicated with the tee joint, one opening of the tee joint is connected with the hydrogen storage tank connecting pipeline, the other opening of the tee joint is connected with the first testing mechanism, and the first testing mechanism is connected with the second testing mechanism; the first testing mechanism is used for testing the air pressure in the hydrogen storage tank connecting pipeline; and the second testing mechanism is used for testing the water content of the hydrogen. The first test mechanism and the second test mechanism are sequentially arranged on the hydrogen discharge passage of the electrolytic bath, so that the centralized detection of the hydrogen pressure and the water content is realized, and the problem of complex structure caused by multi-point arrangement of detection devices is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of PEM electrolytic cells, and particularly relates to a detection device for the electrochemical performance of a PEM electrolytic cell. BACKGROUND

[0002] PEM (Proton Exchange Membrane) electrolytic cells are widely used in hydrogen production systems due to their fast start-up speed, high current density, and suitability for coupling with renewable energy sources. During the operation of the PEM electrolytic cell, the hydrogen generated by the electrolysis reaction usually needs to be transported into a hydrogen storage tank through a pipeline, and the operation state and hydrogen production quality directly affect the safety and stability of the entire hydrogen production system.

[0003] In the prior art, in order to evaluate the electrochemical performance of the PEM electrolytic cell, multiple parameters during hydrogen production need to be monitored, including hydrogen pressure, which can reflect the operating load state of the electrolytic cell and the pipeline sealing condition, and hydrogen water content, which directly affects the safety and reliability of subsequent hydrogen storage, transportation and use. Therefore, detecting hydrogen pressure and water content is an important part of PEM electrolytic cell performance evaluation.

[0004] However, the existing detection methods usually use separately arranged detection devices or multiple sensors arranged at different positions, which have complex structures, large space occupation, scattered detection paths, and are difficult to uniformly and effectively detect key parameters of hydrogen before it enters the storage tank. In addition, in the existing scheme, the pressure detection and water content detection are usually independent of each other, lack reasonable gas path integration, and are prone to cause complicated detection process, high installation and maintenance cost, which is not conducive to the miniaturization and integration of the PEM electrolytic cell system.

[0005] Therefore, there is an urgent need for a PEM electrolytic cell electrochemical performance detection device with compact structure and capable of simultaneously detecting hydrogen pressure and water content during hydrogen transportation, to overcome the above-mentioned problems in the prior art. SUMMARY

[0006] To solve the problems raised in the background art, the application provides a detection device for the electrochemical performance of a PEM electrolytic cell.

[0007] To achieve the above-mentioned purpose, the application provides the following technical solution: a detection device for the electrochemical performance of a PEM electrolytic cell, comprising an electrolytic cell, a first test mechanism and a second test mechanism. The electrolytic cell comprises a base body, a hydrogen discharge pipe, a tee joint and a hydrogen storage tank connecting pipeline. The hydrogen exhaust pipe is arranged on the base body, one end of the hydrogen exhaust pipe is communicated with the tee joint, one opening of the tee joint is connected with the hydrogen storage tank connecting pipeline, and the other opening of the tee joint is connected with the first testing mechanism, and the first testing mechanism is connected with the second testing mechanism. The first testing mechanism is used for testing the air pressure in the hydrogen storage tank connecting pipeline. The second testing mechanism is used for testing the water content of hydrogen.

[0008] Preferably, the first testing mechanism and the second testing mechanism can switch the working state with each other during actual detection, and the hydrogen parameter detection is alternately completed in a time-sharing mode.

[0009] Preferably, the first testing mechanism comprises an air pressure measuring module, a first branch pipe, a second branch pipe, a gate valve and a third branch pipe. The first branch pipe is connected with one opening of the tee joint, the first branch pipe is connected with the gate valve through a switching mechanism, the gate valve is connected with the second branch pipe, and the second branch pipe is connected with the air pressure measuring module. The first branch pipe is also connected with the third branch pipe through the switching mechanism, and the second testing mechanism is arranged on the third branch pipe. The switching mechanism is used for switching the first testing mechanism and the second testing mechanism.

[0010] Preferably, the second testing mechanism is a water content testing module.

[0011] The switching mechanism comprises a sleeve, a first opening and a second opening. The sleeve is slidably connected with the outer wall of the first branch pipe, the sleeve is connected with the third branch pipe, the second opening is arranged below the third branch pipe, and the first opening is formed on the first branch pipe. When the first opening corresponds to the second opening, the second testing mechanism monitors the water content of hydrogen.

[0012] Preferably, a driving mechanism is further arranged, the driving mechanism is connected with the third branch pipe, the driving mechanism can drive the third branch pipe to move, and the driving mechanism can also drive the sleeve to move on the outer wall of the first branch pipe.

[0013] Preferably, a cleaning mechanism is further arranged, the cleaning mechanism comprises a fourth branch pipe, a cleaning pipe, a first one-way valve, a second one-way valve, a moving sleeve, a connecting rod, an outer cylinder, a first side plate, a sliding rod, a spring and a second side plate. The fourth branch pipe is fixed on the support, the fourth branch pipe is connected with the cleaning pipe, the gas outlet end of the cleaning pipe corresponds to the monitoring end of the second testing mechanism, a first one-way valve is arranged on the cleaning pipe, the cleaning pipe passes through the outer cylinder, a second one-way valve is arranged on the outer cylinder, the inner wall of the outer cylinder is slidably connected with the first side plate, the first side plate is connected with the slide rod, the slide rod is slidably connected with the second side plate, the second side plate is connected with the inner side of the outer cylinder, the spring is sleeved on the slide rod, and the two ends of the spring are connected with the first side plate and the second side plate respectively. The moving sleeve is slidably connected with the fourth branch pipe, and the moving sleeve is connected with the third branch pipe.

[0014] Preferably, the moving sleeve is connected with the connecting rod, and the connecting rod is connected with the second side plate.

[0015] Preferably, when the first side plate moves towards the second one-way valve, the first side plate is relatively close to the second side plate and compresses the spring due to the fact that the aperture of the cleaning pipe is smaller than the outer cylinder, and the spring continues to exhaust the gas from the cleaning pipe by relying on the elastic force of the spring. The first one-way valve limits the gas to be input from the outer cylinder to the cleaning pipe, and the second one-way valve limits the gas to be input from the external storage medium to the outer cylinder.

[0016] Preferably, the linkage mechanism further comprises a rod body, a plate body and a protrusion. The rod body is connected with the third branch pipe, the rod body is connected with the plate body, the inner side of the plate body is provided with a straight groove, the protrusion is slidably connected with the straight groove, and the protrusion is connected with the rotary operation end. When the first opening corresponds to the second opening, the gate valve is closed, and when the first opening is misaligned with the second opening, the gate valve is opened.

[0017] Compared with the prior art, the beneficial effects of the present application are that by sequentially arranging the first testing mechanism and the second testing mechanism on the hydrogen exhaust passage of the electrolytic cell, centralized detection of hydrogen pressure and water content is realized, and the problem of complex structure caused by multi-point arrangement of the detection device is avoided.

[0018] The first testing mechanism is used for detecting the gas pressure in the hydrogen storage tank connecting pipeline, and the second testing mechanism is used for detecting the water content of hydrogen before entering the storage tank, so that the obtained detection data can truly reflect the actual state of hydrogen production of the electrolytic cell, and accurate evaluation of the electrochemical performance of the electrolytic cell is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the invention; Figure 3 This is a schematic diagram of the connection structure of the first testing mechanism in this invention; Figure 4 This is a schematic diagram of a partial connection structure of the first testing mechanism in this invention; Figure 5 This is a schematic diagram of the planar connection structure of the first testing mechanism in this invention; Figure 6 For the present invention Figure 5 Sectional view at point A in the middle; Figure 7 For the present invention Figure 5 Sectional view at point B.

[0020] Explanation of reference numerals in the attached figures: 1-Electrolytic cell, 11-Hydrogen exhaust pipe, 12-Tee, 13-Pipe, 14-Base, 2-First testing mechanism, 21-Module, 22-First branch pipe, 23-Second branch pipe, 24-Gate valve, 241-Rotating operating end, 25-Third branch pipe, 3-Drive mechanism, 4-Second testing mechanism, 5-Cleaning mechanism, 51-Fourth branch pipe, 510-Spring, 511-Second side plate, 52-Cleaning pipe, 53-First check valve, 54-Second check valve, 55-Moving sleeve, 56-Connecting rod, 57-Outer cylinder, 58-First side plate, 59-Slide rod, 6-Switching mechanism, 61-Sleeve, 62-Second opening, 63-First opening, 7-Linkage mechanism, 71-Rod body, 72-Protrusion, 73-Plate body. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 7 As shown: A device for testing the electrochemical performance of a PEM electrolyzer includes an electrolyzer 1, a first testing mechanism 2, and a second testing mechanism 4; The electrolytic cell 1 comprises a base body 14, a hydrogen discharge pipe 11, a tee joint 12 and a hydrogen storage tank connecting pipe 13; wherein the base body 14 is used to bear the overall structure of the electrolytic cell, the hydrogen discharge pipe 11 is arranged on the base body 14 and is used to guide the hydrogen generated in the operation process of the electrolytic cell out.

[0023] One end of the hydrogen discharge pipe 11 is communicated with the tee joint 12, one opening of the tee joint 12 is connected with the hydrogen storage tank connecting pipe 13 and is used to deliver the hydrogen to the external hydrogen storage tank, and the other opening of the tee joint 12 is connected with the first test mechanism 2, so that the hydrogen can enter the detection passage before entering the hydrogen storage tank.

[0024] The first test mechanism 2 is connected with the second test mechanism 4; The first test mechanism 2 is used to test the gas pressure in the hydrogen storage tank connecting pipe 13 to obtain the hydrogen production pressure parameter under the operation state of the PEM electrolytic cell; The second test mechanism 4 is used to test the water content of the hydrogen to reflect the dryness and wetness of the hydrogen in the electrochemical reaction process of the electrolytic cell.

[0025] The first test mechanism 2 and the second test mechanism 4 can switch the working states with each other in actual detection, so as to alternately complete the hydrogen parameter detection in a time-sharing manner, thereby avoiding the gas path interference caused by simultaneous detection and improving the accuracy and stability of the detection results.

[0026] The first test mechanism 2 comprises a gas pressure measuring module 21, a first branch pipe 22, a second branch pipe 23, a gate valve 24 and a third branch pipe 25; The first branch pipe 22 is connected with one opening of the tee joint 12, so that the hydrogen can enter the first test mechanism 2 from the electrolytic cell; the first branch pipe 22 is connected with the gate valve 24 through the switching mechanism 6, the gate valve 24 is connected with the second branch pipe 23, the second branch pipe 23 is connected with the gas pressure measuring module 21, and under the condition that the gate valve 24 is opened, the hydrogen can enter the gas pressure measuring module 21 to complete the gas pressure detection; The first branch pipe 22 is also connected with the third branch pipe 25 through the switching mechanism 6, the second test mechanism 4 is arranged on the third branch pipe 25 and is used to introduce the hydrogen into the water content testing module after switching; The switching mechanism 6 is used to switch the working states of the first test mechanism 2 and the second test mechanism 4, so as to realize the selective detection of different detection parameters.

[0027] The second test mechanism 4 is a water content testing module, the structure and model of which can be set according to the actual detection requirement and is used to detect the water content in the hydrogen in real time.

[0028] The switching mechanism 6 comprises a sleeve pipe 61, a first opening 63 and a second opening 62; The sleeve 61 is in sliding connection with the outer wall of the first branch pipe 22, the sleeve 61 is in fixed connection with the third branch pipe 25, the second opening 62 is arranged below the third branch pipe 25, and the first opening 63 is processed on the first branch pipe 22; When the first opening 63 corresponds to the second opening 62, the first branch pipe 22 communicates with the third branch pipe 25, and the hydrogen enters the second test mechanism 4 through the third branch pipe 25, and the second test mechanism 4 monitors the water content of the hydrogen.

[0029] In actual use, the driving mechanism 3 drives the third branch pipe 25 to move relative to the first branch pipe 22, so as to drive the sleeve 61 to slide on the outer wall of the first branch pipe 22, so that the first opening 63 is aligned or misaligned with the second opening 62, so as to realize switching of the hydrogen detection channel.

[0030] In the embodiment, the driving mechanism 3 is further included, the driving mechanism 3 is connected with the third branch pipe 25, the driving mechanism 3 can drive the third branch pipe 25 to move, and can also drive the sleeve 61 to move on the outer wall of the first branch pipe 22, so as to realize automatic switching of the switching mechanism 6; The cleaning mechanism 5 is further included, the cleaning mechanism 5 is used for cleaning the monitoring end of the second test mechanism 4, so as to avoid that water or impurities in the hydrogen are attached to affect the detection accuracy of the water content; The cleaning mechanism 5 includes a fourth branch pipe 51, a cleaning pipe 52, a first one-way valve 53, a second one-way valve 54, a moving sleeve 55, a connecting rod 56, an outer cylinder 57, a first side plate 58, a sliding rod 59, a spring 510 and a second side plate 511; The fourth branch pipe 51 is fixed on the support, the fourth branch pipe 51 is connected with the cleaning pipe 52, the gas outlet end of the cleaning pipe 52 is arranged in correspondence with the monitoring end of the second test mechanism 4, and the first one-way valve 53 is arranged on the cleaning pipe 52 and is used for limiting the gas flow direction; The cleaning pipe 52 penetrates through the outer cylinder 57, the second one-way valve 54 is arranged on the outer cylinder 57 and is used for limiting that the gas in the external storage medium can only enter the outer cylinder 57; The inner wall of the outer cylinder 57 is in sliding connection with the first side plate 58, the first side plate 58 is connected with the sliding rod 59, the sliding rod 59 is in sliding connection with the second side plate 511, the second side plate 511 is connected with the inner side of the outer cylinder 57, the spring 510 is sleeved on the sliding rod 59, and the two ends of the spring 510 are connected with the first side plate 58 and the second side plate 511 respectively; The moving sleeve 55 is in sliding connection with the fourth branch pipe 51, the moving sleeve 55 is connected with the third branch pipe 25, the moving sleeve 55 is connected with the connecting rod 56, and the connecting rod 56 is connected with the second side plate 511; When the first side plate 58 moves toward the direction of the second one-way valve 54, since the diameter of the cleaning pipe 52 is smaller than that of the outer cylinder 57, the first side plate 58 moves closer to the second side plate 511 and compresses the spring 510, and under the elastic force of the spring 510, the gas is continuously discharged from the cleaning pipe 52. Furthermore, when the first side plate 58 moves toward the direction of the second one-way valve 54, the distance between the first side plate 58 and the second side plate 511 decreases, causing the gas inside the outer cylinder 57 to be compressed; under the action of gas pressure, the spring 510 is compressed and stores elastic potential energy.

[0031] Under the rebound action of spring 510, the gas in outer cylinder 57 enters cleaning pipe 52 through first one-way valve 53 and is continuously discharged to purge and clean the monitoring end of second test mechanism 4.

[0032] The orifice of the cleaning pipe 52 is smaller than the inner diameter of the outer cylinder 57, which is used to limit the flow of the discharged gas to ensure the stability of the purging process.

[0033] The first one-way valve 53 restricts gas from entering the cleaning pipe 52 only from the outer cylinder 57, and the second one-way valve 54 restricts gas from entering the outer cylinder 57 only from the external storage medium, thereby realizing one-way purging and cleaning of the monitoring end of the second testing mechanism 4.

[0034] It also includes a linkage mechanism 7, and a rotary operating end 241 is provided on the gate valve 24; The linkage mechanism 7 includes a rod 71, a plate 73, and a protrusion 72; The rod 71 is connected to the third branch pipe 25, the rod 71 is connected to the plate 73, the inner side of the plate 73 is provided with a straight groove, the protrusion 72 is slidably connected to the straight groove, and the protrusion 72 is connected to the rotating operating end 241. When the first opening 63 corresponds to the second opening 62, the rod 71 drives the plate 73 to move, causing the protrusion 72 to drive the rotary operating end 241 to rotate, thereby closing the gate valve 24. Furthermore, when the first opening 63 corresponds to the second opening 62, the third branch pipe 25 is in the detection switching position relative to the first branch pipe 22, the rod 71 moves synchronously with the third branch pipe 25, and drives the plate 73 to move.

[0035] During the movement of plate 73, protrusion 72 moves along the straight groove on the inner side of plate 73 and applies a rotational torque to the rotating operating end 241 of gate valve 24, causing the rotating operating end 241 to rotate, thereby driving the valve core of gate valve 24 to rotate to the closed position and cutting off the air passage between the first branch pipe 22 and the second branch pipe 23.

[0036] When the first opening 63 and the second opening 62 are misaligned, the linkage mechanism 7 opens the gate valve 24, allowing hydrogen to enter the pressure measurement module 21 for detection.

[0037] In actual use, the PEM electrolyzer 1 is started first. After the electrolyzer 1 is powered on, it undergoes an electrochemical reaction and continuously produces hydrogen. The produced hydrogen is discharged through the hydrogen discharge pipe 11 and enters the detection passage through the three-way valve 12.

[0038] When it is necessary to detect the gas pressure in the hydrogen storage tank connecting pipe 13, the drive mechanism 3 is in the first working state, driving the third branch pipe 25 to move relative to the first branch pipe 22, so that the first opening 63 and the second opening 62 in the switching mechanism 6 are misaligned, and at this time the first branch pipe 22 and the third branch pipe 25 are not connected.

[0039] In this state, the linkage mechanism 7 operates synchronously, the rod 71 drives the plate 73 to move, causing the protrusion 72 to drive the rotating operating end 241 of the gate valve 24 to rotate, thereby opening the gate valve 24. At this time, hydrogen gas enters the pressure measurement module 21 sequentially through the first branch pipe 22, the gate valve 24, and the second branch pipe 23. The pressure measurement module 21 detects the hydrogen pressure in real time and obtains the corresponding pressure parameter data.

[0040] After the air pressure test is completed, the drive mechanism 3 switches to the second working state and drives the third branch pipe 25 to move in the opposite direction, thereby causing the sleeve 61 to slide on the outer wall of the first branch pipe 22, so that the first opening 63 corresponds to the second opening 62, and the first branch pipe 22 and the third branch pipe 25 are connected.

[0041] During this process, the linkage mechanism 7 operates synchronously again, causing the gate valve 24 to close under the drive of the protrusion 72, cutting off the gas path between the first branch pipe 22 and the second branch pipe 23, and preventing hydrogen from entering the pressure measurement module 21.

[0042] At this time, hydrogen gas enters the third branch pipe 25 directly through the first branch pipe 22, and then enters the second testing mechanism 4 set on the third branch pipe 25. The second testing mechanism 4 detects the water content of the hydrogen gas to obtain relevant parameters of the water content in the hydrogen gas.

[0043] While the moisture content is being measured, the cleaning mechanism 5 works in conjunction with the movement of the third branch pipe 25. The moving sleeve 55 is displaced relative to the fourth branch pipe 51 under the drive of the third branch pipe 25, and drives the second side plate 511 and the slide rod 59 to move relative to each other through the connecting rod 56, causing the first side plate 58 to move closer to the second one-way valve 54.

[0044] Since the aperture of the cleaning pipe 52 is smaller than that of the outer cylinder 57, the first side plate 58 gradually compresses the spring 510 during movement. The gas in the external storage medium enters the outer cylinder 57 under the action of the second one-way valve 54, and is continuously discharged into the cleaning pipe 52 through the first one-way valve 53 under the elastic force of the spring 510, thus purging and cleaning the monitoring end of the second testing mechanism 4, thereby effectively removing the attached water vapor or impurities and ensuring the accuracy and stability of the moisture content detection results.

[0045] After the moisture content test is completed, the drive mechanism 3 can drive the third branch pipe 25 to reset again, so that the switching mechanism 6 returns to the air pressure test state, and the device enters the next test cycle.

[0046] By adopting the above-mentioned time-sharing operation mode, the alternating detection of hydrogen pressure and water content parameters is realized in the same detection device, avoiding mutual interference between detection gas paths, and improving the reliability and practicality of electrochemical performance detection of PEM electrolyzer.

[0047] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the electrochemical performance of a PEM electrolyzer, characterized in that: It comprises an electrolytic cell (1), a first testing mechanism (2) and a second testing mechanism (4). The electrolytic cell (1) comprises a base body (14), a hydrogen discharge pipe (11), a tee joint (12) and a hydrogen storage tank connecting pipeline (13). The hydrogen discharge pipe (11) is arranged on the base body (14), one end of the hydrogen discharge pipe (11) is communicated with the tee joint (12), one opening of the tee joint (12) is connected with the hydrogen storage tank connecting pipeline (13), the other opening of the tee joint (12) is connected with the first testing mechanism (2), the first testing mechanism (2) is connected with the second testing mechanism (4). The first testing mechanism (2) is used for testing the air pressure in the hydrogen storage tank connecting pipeline (13). The second testing mechanism (4) is used for testing the water content of hydrogen. The first testing mechanism (2) and the second testing mechanism (4) can switch the working state with each other in actual detection, and the hydrogen parameter detection is completed alternately in time-sharing mode.

2. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 1, characterized in that: The first testing mechanism (2) comprises a gas pressure measuring module (21), a first branch pipe (22), a second branch pipe (23), a gate valve (24) and a third branch pipe (25). The first branch pipe (22) is connected with one opening of the tee joint (12), the first branch pipe (22) is connected with the gate valve (24) through a switching mechanism (6), the gate valve (24) is connected with the second branch pipe (23), and the second branch pipe (23) is connected with the gas pressure measuring module (21). The first branch pipe (22) is also connected with the third branch pipe (25) through the switching mechanism (6), and the second testing mechanism (4) is arranged on the third branch pipe (25). The switching mechanism (6) is used for switching the first testing mechanism (2) and the second testing mechanism (4).

3. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 1, characterized in that: The second testing mechanism (4) is a water content testing module.

4. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 2, characterized in that: The switching mechanism (6) comprises a sleeve (61), a first opening (63) and a second opening (62). The sleeve (61) is slidably connected with the outer wall of the first branch pipe (22), the sleeve (61) is connected with the third branch pipe (25), the second opening (62) is arranged below the third branch pipe (25), and the first opening (63) is processed on the first branch pipe (22). When the first opening (63) corresponds to the second opening (62), the second testing mechanism (4) monitors the water content of hydrogen.

5. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 4, characterized in that: A driving mechanism (3) is further arranged, the driving mechanism (3) is connected with the third branch pipe (25), and the driving mechanism (3) can drive the third branch pipe (25) to move and also drive the sleeve (61) to move on the outer wall of the first branch pipe (22).

6. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 5, characterized in that: A cleaning mechanism (5) is further arranged, the cleaning mechanism (5) comprises a fourth branch pipe (51), a cleaning pipe (52), a first one-way valve (53), a second one-way valve (54), a moving sleeve (55), a connecting rod (56), an outer cylinder (57), a first side plate (58), a sliding rod (59), a spring (510) and a second side plate (511). The fourth branch pipe (51) is fixed on the support, the fourth branch pipe (51) is connected with the cleaning pipe (52), the gas outlet end of the cleaning pipe (52) corresponds with the monitoring end of the second test mechanism (4), the first one-way valve (53) is arranged on the cleaning pipe (52), the cleaning pipe (52) passes through the outer cylinder (57), the second one-way valve (54) is arranged on the outer cylinder (57), the inner wall of the outer cylinder (57) is slidably connected with the first side plate (58), the first side plate (58) is connected with the slide rod (59), the slide rod (59) is slidably connected with the second side plate (511), the second side plate (511) is connected with the inner side of the outer cylinder (57), the spring (510) is sleeved on the slide rod (59), and the two ends of the spring (510) are connected with the first side plate (58) and the second side plate (511) respectively. The moving sleeve (55) is slidably connected with the fourth branch pipe (51), and the moving sleeve (55) is connected with the third branch pipe (25).

7. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 6, characterized in that: The moving sleeve (55) is connected with the connecting rod (56), and the connecting rod (56) is connected with the second side plate (511).

8. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 7, characterized in that: When the first side plate (58) moves towards the second one-way valve (54), because the aperture of the cleaning pipe (52) is smaller than the outer cylinder (57), the first side plate (58) is relatively close to the second side plate (511) and compresses the spring (510), and the spring (510) continuously discharges gas from the cleaning pipe (52) by relying on the elastic force of the spring (510); The first one-way valve (53) limits that gas can only be input from the outer cylinder (57) to the cleaning pipe (52), and the second one-way valve (54) limits that gas can only be input from the external storage medium to the outer cylinder (57).

9. The device for detecting the electrochemical performance of a PEM electrolyzer according to claim 8, characterized in that: Further comprising a linkage mechanism (7), the gate valve (24) is provided with a rotary operation end (241), the linkage mechanism (7) comprises a rod body (71), a plate body (73) and a protrusion (72); The rod body (71) is connected with the third branch pipe (25), the rod body (71) is connected with the plate body (73), the inner side of the plate body (73) is provided with a straight groove, the protrusion (72) is slidably connected with the straight groove, and the protrusion (72) is connected with the rotary operation end (241). When the first opening (63) corresponds to the second opening (62), the gate valve (24) is closed, and when the first opening (63) is misaligned with the second opening (62), the gate valve (24) is opened.

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