A method for evaluating hydrogen leakage rate of a hydrogen fuel cell stack

Abstract

The present invention discloses a method for evaluating hydrogen leakage rate of a hydrogen fuel cell stack, and relates to the technical field of hydrogen fuel cells. The evaluation method adopts an evaluation device, which is installed on a mounting plate, a storage cylinder is detachably installed on the bottom of the mounting plate, a control device is installed on the top of the storage cylinder, and a delivery pipe is installed on the top of the control device. The evaluation device includes: a semicircular frame, which is slidably installed on the mounting plate. The hydrogen leakage rate evaluation device of the hydrogen fuel cell stack can control the position where the device and the delivery pipe are connected to seal through the semicircular frame to prevent hydrogen from drifting into the air, the partition plate can divide the space inside the semicircular frame into multiple areas, and the arc-shaped slide plate can drive the detection device to rotate on the semicircular frame, so that the detection device can detect multiple positions inside the semicircular frame.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a method for evaluating the hydrogen leakage rate of a hydrogen fuel cell stack. Background Art

[0002] Hydrogen fuel cells require hydrogen and oxygen when used. Since hydrogen is stored under pressure, hydrogen may leak during the transportation process, which can be dangerous.

[0003] When detecting the transportation of hydrogen, since the pipeline and the hydrogen storage tank are connected, the connection position of the pipeline and the storage tank is prone to leakage. When detecting the leakage of hydrogen, the hydrogen leakage will quickly drift into the air, making it difficult to detect and determine the specific location of the hydrogen leakage, thereby reducing the practicality of hydrogen leakage detection. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a hydrogen fuel cell stack hydrogen leakage rate evaluation device and evaluation method, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a hydrogen fuel cell stack hydrogen leakage rate evaluation device, the evaluation device is installed on a mounting plate, a storage cylinder is detachably installed at the bottom of the mounting plate, a control device is installed on the top of the storage cylinder, and a delivery pipe is installed on the top of the control device, the evaluation device includes:

[0008] A semicircular frame, the semicircular frame is slidably mounted on the mounting plate, the semicircular frame is provided with two pieces, and a partition plate is fixedly mounted inside the semicircular frame;

[0009] An arc-shaped slide plate, wherein the arc-shaped slide plate is arranged on a semicircular frame, a slide groove is provided on the semicircular frame, the arc-shaped slide plate is slidably mounted on the slide groove, and a detection device is installed on the top of the arc-shaped slide plate;

[0010] A fixed plate is installed on the top of the semicircular frame, a sliding rod is slidably installed on the fixed plate, a positioning block is fixedly installed on one end of the sliding rod close to the conveying pipe, a connecting magnet is fixedly installed on one end of the sliding rod away from the positioning block, and a positioning groove is opened on the arc-shaped slide plate.

[0011] Preferably, a plurality of partition plates are installed, and a notch is formed on the partition plates.

[0012] Preferably, a first spring sheet is provided between the slide bar and the semicircular frame, and the magnetic poles of the contact positions of the connecting magnets are opposite.

[0013] Preferably, a detection error elimination device is provided on the mounting plate, and the detection error elimination device comprises:

[0014] A sealing frame, the sealing frame is fixedly mounted on the mounting plate, a piston is movably mounted inside the sealing frame, an arc-shaped hollow frame is fixedly mounted on the outer wall of the semicircular frame, the arc-shaped hollow frame is connected with the interior of the sealing frame through an air guide pipe, and an exhaust pipe is fixedly mounted on the arc-shaped hollow frame;

[0015] An L-shaped plate is fixedly mounted on a surface of the piston close to the semicircular frame, and an arc-shaped push plate is fixedly mounted on a side of the semicircular frame close to the piston.

[0016] Preferably, a ventilation assist device is provided on the semicircular frame, and the ventilation assist device comprises:

[0017] An elastically curved jet plate, the elastically curved jet plate being fixedly mounted on the exhaust pipe inside the semicircular frame;

[0018] A sealing plate is installed on the inner wall of a semicircular frame, a contact rod is fixedly installed on one side of the sealing frame close to the conveying pipe, a transmission rod is fixedly installed on one side of the sealing plate close to the elastically curved jet plate, an arc block is fixedly installed on one side of the transmission rod close to the elastically curved jet plate, and a ventilation port is opened on the semicircular frame.

[0019] Preferably, a No. 3 spring sheet is provided between the sealing plate and the partition plate, a No. 2 spring sheet is provided between the piston and the sealing frame, and a one-way valve is provided on both the sealing frame and the air guide pipe.

[0020] Preferably, the semicircular frame is provided with a detection and stabilization device, which includes

[0021] A pole is erected, the pole is hinged on the surface of the force-bearing pole, and an arc-shaped positioning plate is fixedly installed on one end of the pole away from the semicircular frame.

[0022] Preferably, an arc-shaped hollow rubber is fixedly mounted on a surface of the arc-shaped positioning plate close to the conveying pipe, and a non-Newtonian fluid is arranged inside the arc-shaped hollow rubber.

[0023] A method for evaluating hydrogen leakage rate of a hydrogen fuel cell stack, comprising:

[0024] Step 1: Push the two semicircular frames toward each other, the semicircular frames seal the connection position between the control device and the conveying pipe, and the two semicircular frames can be adsorbed together by connecting magnets;

[0025] Step 2: Open the control device, and the hydrogen in the storage cylinder enters the inside of the delivery pipe;

[0026] Step 3: Move the detection device on the arc-shaped slide plate, which can detect hydrogen leakage at the connection between the control device and the delivery pipe;

[0027] Step 4: The location of the hydrogen leak can be located by moving the detection device.

[0028] (III) Beneficial effects

[0029] The present invention provides a hydrogen fuel cell stack hydrogen leakage rate evaluation device and evaluation method. It has the following beneficial effects:

[0030] (1) In the present invention, the position where the device and the delivery pipe are connected can be sealed by a semicircular frame to prevent hydrogen from drifting into the air. The partition plate can divide the space inside the semicircular frame into multiple areas. The arc-shaped slide plate can drive the detection device to rotate on the semicircular frame, so that the detection device can detect multiple positions inside the semicircular frame. The position of hydrogen leakage can be determined by the detected position and the area separated by the partition plate, thereby preventing the hydrogen leakage from drifting quickly and failing to detect the leakage position.

[0031] (2) In the present invention, the movement of the semicircular frame can drive the arc-shaped push plate to push the L-shaped plate and the piston to move. The piston can squeeze the gas in the sealing frame, so that the gas inside the sealing frame is discharged from the exhaust pipe through the air guide pipe and the arc-shaped hollow frame. The gas discharged from the exhaust pipe squeezes the residual hydrogen in the semicircular frame to avoid hydrogen remaining in the semicircular frame to affect the accuracy of the next detection.

[0032] (3) In the present invention, a ventilation port is provided at the top of the semicircular frame so that the gas inside the semicircular frame can be discharged from the ventilation port. The gas can be discharged from the top by elastically bending the jet plate. When the transmission rod moves, the arc block can elastically bend the jet plate to swing, which can increase the jet range of the elastically bent jet plate, thereby improving the ventilation effect inside the semicircular frame.

[0033] (4) In the present invention, when the semicircular frame moves, it can drive the erecting pole and the arc-shaped positioning plate to move, so that the arc-shaped positioning plate can rotate the delivery pipe, so that the delivery pipe is in a vertical state, avoiding bending of the delivery pipe and wrinkles on the bottom of the delivery pipe, which affects the sealing effect between the delivery pipe and the semicircular frame and the partition plate, and reduces the effect of hydrogen leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2This is a schematic diagram of the positioning block structure of the present invention;

[0036] Figure 3 This is a schematic diagram of the internal structure of the semicircular frame of the present invention;

[0037] Figure 4 This is a schematic diagram of the sealing plate structure of the present invention;

[0038] Figure 5 This is a schematic diagram of the arc block structure of the present invention;

[0039] Figure 6 This is a schematic diagram of the internal structure of the sealing frame of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of the detection and stabilization device of the present invention.

[0041] In the figure: 1. storage cylinder; 2. control device; 3. delivery pipe; 4. mounting plate; 51. semicircular frame; 52. arc-shaped slide plate; 53. detection device; 54. partition plate; 55. fixing plate; 56. slide rod; 57. positioning block; 58. connecting magnet; 61. sealing frame; 62. piston; 63. L-shaped plate; 64. arc-shaped push plate; 65. air guide tube; 66. arc-shaped hollow frame; 67. exhaust pipe; 71. elastically bent jet plate; 72. sealing plate; 73. contact rod; 74. transmission rod; 75. arc-shaped block; 81. erecting rod; 82. arc-shaped positioning plate; 83. arc-shaped hollow rubber; 9. evaluation device. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-7 The present invention provides a technical solution: a hydrogen fuel cell stack hydrogen leakage rate evaluation device 9, the evaluation device 9 is installed on a storage cylinder 1, the storage cylinder 1 stores high-pressure hydrogen, the top of the storage cylinder 1 is equipped with a control device 2, the control device 2 can be a solenoid valve and other equipment that can control the discharge of hydrogen, the control device 2 is connected to a delivery pipe 3, the hydrogen inside the storage cylinder 1 can enter other reaction devices and the interior of the hydrogen fuel cell through the delivery pipe 3, and the top of the storage cylinder 1 is equipped with a detachable mounting plate 4;

[0044] The evaluation device 9 comprises:

[0045] A semicircular frame 51 is slidably mounted on the top of the mounting plate 4. There are two semicircular frames 51. When the two semicircular frames 51 move toward each other, they can surround the connection position between the control device 2 and the delivery pipe 3. A partition plate 54 is fixedly mounted on the inner wall of the semicircular frame 51. There are multiple partition plates 54. The interior of the semicircular frame 51 can be divided into multiple areas by multiple partition plates 54. A notch is provided on one side of the partition plate 54 close to the control device 2. When the semicircular frames 51 move toward each other and drive the partition plate 54 to move, the partition plate 54 can be attached to the connection between the control device 2 and the delivery pipe 3, so that air leakage occurs at the connection between the control device 2 and the delivery pipe 3, so that different areas can be separated by the partition plate 54.

[0046] The arc-shaped slide plate 52 and the top of the semicircular frame 51 are provided with a slide groove, and the arc-shaped slide plate 52 slides inside the slide groove. A detection device 53 is installed on the top of the arc-shaped slide plate 52, and the detection device 53 is connected with the inside of the semicircular frame 51. The hydrogen inside the semicircular frame 51 can be detected by the detection device 53. When passing through the arc-shaped slide plate 52, the detection device 53 can rotate on the two semicircular frames 51, so that the detection device 53 can contact the inside of different areas between the partition plates 54, and it can be determined which two partition plates 54 have hydrogen leakage, so that the position of the leakage at the connection between the control device 2 and the delivery pipe 3 can be confirmed;

[0047] The fixing plate 55 is fixedly installed inside the semicircular frame 51, and a movable groove is provided on the top of the fixing plate 55. A sliding rod 56 is slidably installed on the inner wall of the sliding groove. A No. 1 spring piece is installed between the sliding rod 56 and the semicircular frame 51. A positioning block 57 is fixedly installed on one end of the sliding rod 56 close to the arc-shaped slide plate 52, and a positioning groove matching the bottom of the positioning block 57 is provided on the top of the arc-shaped slide plate 52. A connecting magnet 58 is fixedly installed on one end of the sliding rod 56 away from the positioning block 57. The sliding rod 56 and the two semicircular frames 51 can be connected and merged together through the two connecting magnets 58. The position of the arc-shaped slide plate 52 on the semicircular frame 51 can be limited through the positioning block 57 and the positioning groove to avoid the misalignment of the position of the arc-shaped slide plate 52 affecting the separation of the two semicircular frames 51. Two sliding rods 56 are provided, and the magnetic poles of the two connecting magnets 58 on the two sliding rods 56 at one end are opposite, that is, the two connecting magnets 58 are magnetically attracted to each other.

[0048] Specifically, the evaluation device 9 of the technical solution of the present invention includes a semicircular frame 51, an arc-shaped slide plate 52 and a fixed plate 55. A partition plate 54, an arc-shaped slide plate 52 and a fixed plate 55 are installed on the semicircular frame 51. A detection device 53 capable of detecting hydrogen is installed on the partition plate 54. A slide rod 56, a positioning block 57 and a connecting magnet 58 are provided on the fixed plate 55. A positioning groove is provided on the arc-shaped slide plate 52 so that the positioning block 57 can limit the arc-shaped slide plate 52.

[0049] A detection error elimination device is installed on the mounting plate 4, and the detection error elimination device specifically includes the following contents:

[0050] The sealing frame 61 is fixedly mounted on the mounting plate 4. A piston 62 is slidably mounted on the inner wall of the sealing frame 61 in the left-right direction. The gas inside the sealing frame 61 can be pushed to move during the sliding process of the piston 62. An arc-shaped hollow frame 66 is fixedly mounted on the outer wall of the semicircular frame 51. The arc-shaped hollow frame 66 is fixedly connected to the piston 62 through an air guide pipe 65, and the two ends of the air guide pipe 65 are respectively connected to the arc-shaped hollow frame 66 and the inside of the sealing frame 61, that is, a connecting space is formed between the air guide pipe 65, the arc-shaped hollow frame 66 and the sealing frame 61. An exhaust pipe 67 is fixedly mounted on the inner and outer walls of the semicircular frame 51, and the exhaust pipe 67 is connected to the arc-shaped hollow frame 66;

[0051] An L-shaped plate 63 is installed on the left side of the piston 62. An arc-shaped push plate 64 is fixedly installed on the surface of the semicircular frame 51. The arc-shaped push plate 64 contacts the L-shaped plate 63, so that when the semicircular frame 51 moves, the arc-shaped push plate 64 and the L-shaped plate 63 can push the piston 62 to move. A second spring piece is arranged between the piston 62 and the sealing frame 61. After the L-shaped plate 63 is separated from the arc-shaped push plate 64, the elastic force of the second spring piece can push the piston 62 to reset. A one-way valve is installed on the right side of the sealing frame 61, and a one-way valve is also installed on the air guide pipe 65. The one-way valve on the air guide pipe 65 can prevent the gas inside the semicircular frame 51 from entering the interior of the sealing frame 61 through the air guide pipe 65, so that the air guide pipe 65 can only inlet air into the interior of the arc-shaped hollow frame 66, sealing. The one-way valve on the frame 61 allows outside air to enter the interior of the sealing frame 61, so that the gas inside the sealing frame 61 can only be discharged from the air guide pipe 65 when the piston 62 moves. When the semicircular frame 51 is separated, the L-shaped plate 63 and the arc-shaped push plate 64 can push the piston 62 to move toward the interior of the sealing frame 61, so that the gas inside the sealing frame 61 enters the interior of the arc-shaped hollow frame 66 through the air guide pipe 65, and the gas inside the arc-shaped hollow frame 66 enters the partition plate 54 assembly inside the semicircular frame 51 through the exhaust pipe 67. The gas ejected through the exhaust pipe 67 can ventilate the interior of the semicircular frame 51, thereby preventing the leaked hydrogen from remaining in the semicircular frame 51 and not being discharged, which will affect the accuracy of the hydrogen leakage detection by the semicircular frame 51 and the detection device 53 next time.

[0052] A ventilation assist device is provided on the semicircular frame 51, and the ventilation assist device includes:

[0053] The elastically curved jet plate 71 is fixedly mounted on the left side of the exhaust pipe 67. The top of the elastically curved jet plate 71 can be used for jetting. A jet port is provided on the left side of the elastically curved jet plate 71. The gas ejected from the elastically curved jet plate 71 can be evenly distributed inside the semicircular frame 51 through the jet port.

[0054] The sealing plate 72 is slidably mounted on the top of the inner wall of the semicircular frame 51. A No. 3 spring sheet is arranged between the sealing plate 72 and the partition plate 54. A ventilation port is opened at the top of the semicircular frame 51. A contact rod 73 is fixedly mounted on the left side of the sealing plate 72. When the contact rod 73 contacts the delivery pipe 3, the sealing plate 72 can be driven to move in the direction of the ventilation port. The ventilation port can be sealed by the sealing plate 72 to prevent the semicircular frame 51 from merging to cause the leakage of hydrogen gas to be discharged from the semicircular frame 51 and affect the accuracy of the detection of the detection device 53. The ventilation port is inclinedly arranged to eject hydrogen gas from the ventilation port. A transmission rod 74 is fixedly mounted on the right side of the sealing plate 72. An arc block 75 is fixedly mounted on the bottom of the transmission rod 74. When the sealing plate 72 drives the transmission rod 74 and the arc block 75 to move, the arc block 75 can push the elastically curved jet plate 71 to deform, thereby further improving the uniform jetting effect of the elastically curved jet plate 71.

[0055] Since the density of hydrogen is lower than the normal density of air, the leaked hydrogen will float on the top of the inner wall of the semicircular frame 51. The elastically bent jet plate 71 can blow the gas on the top of the inner wall of the semicircular frame 51 to flow, thereby improving the effect of hydrogen being discharged from the semicircular frame 51. By opening a ventilation port at the top of the semicircular frame 51, the effect of hydrogen being discharged from the semicircular frame 51 can be further improved.

[0056] The semicircular frame 51 is provided with a detection and stabilization device, which includes:

[0057] A rod 81 is erected, and the rod 81 is hinged at the top of the semicircular frame 51. A fourth spring sheet is arranged between the rod 81 and the semicircular frame 51. An arc-shaped positioning plate 82 is fixedly installed on the top of the rod 81. When the semicircular frame 51 is combined, the delivery pipe 3 can be supported by the rod 81 and the arc-shaped positioning plate 82 to prevent the delivery pipe 3 from bending at the position where the delivery pipe 3 contacts the semicircular frame 51 and the partition plate 54. The bent delivery pipe 3 will produce wrinkles, which will affect the sealing effect between the delivery pipe 3 and the semicircular frame 51, and cause the hydrogen inside the semicircular frame 51 to leak, affecting the accuracy of the detection;

[0058] The arc-shaped hollow rubber 83 is fixedly installed on the left side of the arc-shaped positioning plate 82. A non-Newtonian fluid is arranged inside the arc-shaped hollow rubber 83. The arc-shaped hollow rubber 83 can squeeze the delivery tube 3 to produce deformation, so that the flow position of the delivery tube 3 becomes narrower. When the control device 2 is opened, the gas inside the storage cylinder 1 is discharged through the delivery tube 3. When the gas passes through the narrow position of the delivery tube 3, the gas pressure at the connection position of the control device 2 and the delivery tube 3 will increase, so that it can more accurately detect whether the pressure change will affect the air tightness.

[0059] A method for evaluating hydrogen leakage rate of a hydrogen fuel cell stack, comprising:

[0060] Step 1: Push the two semicircular frames toward each other, the semicircular frames seal the connection position between the control device and the conveying pipe, and the two semicircular frames can be adsorbed together by connecting magnets;

[0061] Step 2: Open the control device, and the hydrogen in the storage cylinder enters the inside of the delivery pipe;

[0062] Step 3: Move the detection device on the arc-shaped slide plate, which can detect hydrogen leakage at the connection between the control device and the delivery pipe;

[0063] Step 4: The location of the hydrogen leak can be located by moving the detection device.

[0064] When the embodiment of the present invention is working, the evaluation device 9 is used to detect hydrogen leakage, and the two semicircular frames 51 are pushed to move toward each other. The semicircular frames 51 move toward each other, and the erection rod 81 can be driven to move. The erection rod 81 can drive the arc positioning plate 82 to move. The arc positioning plate 82 can drive the arc hollow rubber 83 to move. The arc hollow rubber 83 can clamp the delivery pipe 3. The arc hollow rubber 83 can squeeze and deform the position where the delivery pipe 3 and the arc hollow rubber 83 contact each other, so that the inside of the delivery pipe 3 becomes narrower, so that the arc hollow rubber 83 can push the delivery pipe 3 to be in a vertical state, and avoid the delivery pipe 3 from bending and wrinkling at the bottom of the delivery pipe 3.

[0065] When the semicircular frame 51 moves, the arc push plate 64 can be driven to move. The arc push plate 64 moves in a direction away from the sealing frame 61 and separates from the L-shaped plate 63. Under the elastic force of the second spring sheet, the piston 62 is pushed to move toward the outside of the sealing frame 61. The piston 62 moves toward the outside of the sealing frame 61 through the one-way valve of the sealing frame 61 so that the outside air can enter the inside of the sealing frame 61. When the semicircular frames 51 move toward each other, the sealing plate 72 and the contact rod 73 can be driven to move, so that the contact rod 73 can contact the delivery pipe 3, so that the delivery pipe 3 can push the contact rod 73 and the sealing plate 72 to move toward the inside of the semicircular frame 51. The movement of the sealing plate 72 can seal the ventilation port. When the semicircular frames 51 are merged together, the two magnets are adsorbed together, and the two semicircular frames 51 can be prevented from separating by magnet adsorption.

[0066] Open the control device 2. By opening the control device 2, the hydrogen inside the storage cylinder 1 will enter the inside of the delivery pipe 3. When the hydrogen inside the delivery pipe 3 passes through the narrower position of the delivery pipe 3, the air pressure between the arc hollow rubber 83 and the control device 2 will increase, so that the air tightness between the delivery pipe 3 and the control device 2 can be detected. Pull the slide bar 56 upward, and the two slide bars 56 can be driven to move upward through the transmission of the connecting magnet 58. The upward movement of the slide bar 56 can drive the positioning block 57 to move upward. The upward movement of the positioning block 57 will disengage from the positioning groove on the arc slide 52, so that the positioning block 57 cannot position the arc slide 52. The rotating detection device 53 can detect hydrogen and detect whether there is hydrogen inside the semicircular frame 51. When hydrogen exists inside the semicircular frame 51, the position of the leakage between the control device 2 and the delivery pipe 3 can be determined through the detection position and the separation of the area inside the semicircular frame 51 by the partition plate 54.

[0067] Then rotate the arc slide 52 and the detection device 53 to the position between them, release the slide bar 56, and under the elastic force of the No. 1 spring piece, the slide bar 56 and the positioning block 57 can be driven to move downward, and the positioning block 57 can be inserted into the inner part of the positioning groove to limit the arc slide 52 by moving downward, and the two semicircular frames 51 are pulled to move back to back, and the contact rod 73 is separated from the conveying pipe 3 by the movement of the semicircular frames 51 back to back. Under the elastic force of the No. 3 spring piece, the sealing plate 72 and the contact rod 73 can be pushed to move to the outside of the semicircular frame 51, so that the sealing plate 72 can open the ventilation port, and the semicircular frame 51 can move back to back to drive the arc push plate 64 to contact the L-shaped plate 63, so that the L-shaped plate 63 can push the piston 62 to move, and the piston 62 can squeeze the gas inside the sealing frame 61, so that the gas inside the sealing frame 61 enters the interior of the arc-shaped hollow frame 66 through the air guide pipe 65, and the gas inside the arc-shaped hollow frame 66 is ejected from the elastically curved jet plate 71 through the exhaust pipe 67. The gas blown out by the elastically curved jet plate 71 can discharge the hydrogen inside the semicircular frame 51 from the ventilation port and the semicircular frame 51. When the sealing plate 72 moves, it can drive the transmission rod 74 and the arc block 75 to move. When the arc block 75 moves, it will hit the elastically curved jet plate 71 to swing. The swing generated by the elastically curved jet plate 71 can increase the range of the blown gas and improve the ventilation effect.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An evaluation device used in a hydrogen fuel cell stack hydrogen leakage rate evaluation method, the evaluation device is mounted on a mounting plate, a storage cylinder is detachably mounted on the bottom of the mounting plate, a control device is mounted on the top of the storage cylinder, and a delivery pipe is mounted on the top of the control device, characterized in that: The evaluation device comprises: A semicircular frame is slidably mounted on the top of the mounting plate. There are two semicircular frames. When the two semicircular frames move toward each other, they surround the connection position between the control device and the delivery pipe. A partition plate is fixedly mounted on the inner wall of the semicircular frame. There are multiple partition plates. The interior of the semicircular frame is divided into multiple areas by the multiple partition plates. A notch is provided on the side of the partition plate close to the control device. When the semicircular frames move toward each other and drive the partition plate to move, the partition plate fits the connection between the control device and the delivery pipe, so that air leakage occurs at the connection between the control device and the delivery pipe, and the air is separated into different areas of the partition plate. The arc-shaped slide plate has a slide groove on the top of the semicircular frame, and the arc-shaped slide plate slides inside the slide groove. A detection device is installed on the top of the arc-shaped slide plate, and the detection device is connected to the inside of the semicircular frame. The hydrogen inside the semicircular frame is detected by the detection device. When passing through the arc-shaped slide plate, the detection device rotates on the two semicircular frames, so that the detection device contacts the inside of different areas between the partition plates, and determines which two partition plates have hydrogen leakage, thereby confirming the position of the leakage at the connection between the control device and the delivery pipe; A fixed plate is installed on the top of the semicircular frame, a sliding rod is slidably installed on the fixed plate, a positioning block is fixedly installed on one end of the sliding rod close to the conveying pipe, a connecting magnet is fixedly installed on one end of the sliding rod away from the positioning block, and a positioning groove is opened on the arc-shaped slide plate.

2. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 1 is characterized in that: A first spring piece is arranged between the slide bar and the semicircular frame.

3. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 1 is characterized in that: The mounting plate is provided with a detection error elimination device, and the detection error elimination device comprises: A sealing frame, the sealing frame is fixedly mounted on the mounting plate, a piston is movably mounted inside the sealing frame, an arc-shaped hollow frame is fixedly mounted on the outer wall of the semicircular frame, the arc-shaped hollow frame is connected with the interior of the sealing frame through an air guide pipe, and an exhaust pipe is fixedly mounted on the arc-shaped hollow frame; An L-shaped plate is fixedly mounted on a surface of the piston close to the semicircular frame, and an arc-shaped push plate is fixedly mounted on a side of the semicircular frame close to the piston.

4. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 3 is characterized in that: The semicircular frame is provided with a ventilation auxiliary device, which includes: An elastically curved jet plate, the elastically curved jet plate being fixedly mounted on the exhaust pipe inside the semicircular frame; A sealing plate is installed on the inner wall of a semicircular frame, a contact rod is fixedly installed on one side of the sealing frame close to the conveying pipe, a transmission rod is fixedly installed on one side of the sealing plate close to the elastically curved jet plate, an arc block is fixedly installed on one side of the transmission rod close to the elastically curved jet plate, and a ventilation port is opened on the semicircular frame.

5. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 4 is characterized in that: A No. 3 spring sheet is arranged between the sealing plate and the partition plate, a No. 2 spring sheet is arranged between the piston and the sealing frame, and a one-way valve is arranged on the sealing frame and the air guide pipe.

6. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 1 is characterized in that: The semicircular frame is provided with a detection and stabilization device, which includes A pole is erected, the pole is hinged on the surface of the force-bearing pole, and an arc-shaped positioning plate is fixedly installed on one end of the pole away from the semicircular frame.

7. The evaluation device used in the hydrogen leakage rate evaluation method of a hydrogen fuel cell stack according to claim 6 is characterized in that: An arc-shaped hollow rubber is fixedly mounted on one surface of the arc-shaped positioning plate close to the conveying pipe, and a non-Newtonian fluid is arranged inside the arc-shaped hollow rubber.

8. A method for evaluating hydrogen leakage rate of a hydrogen fuel cell stack, the method being applied to the evaluation device as claimed in claim 1, characterized in that: include: Step 1: Push the two semicircular frames to move toward each other, the semicircular frames seal the connection position between the control device and the conveying pipe, and the two semicircular frames are adsorbed together by connecting magnets; Step 2: Open the control device, and the hydrogen in the storage cylinder enters the inside of the delivery pipe; Step 3: Move the detection device on the arc-shaped slide plate to detect hydrogen leakage at the connection between the control device and the delivery pipe; Step 4: Locate the location of the hydrogen leak by moving the detection device.

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