A fuel cell leak detection apparatus

Abstract

The application discloses a kind of fuel cell leak detection devices, and fuel cell includes multiple single cells.Fuel cell leak detection device includes support seat, first end plate, second end plate, power component, multiple first pull rods and voltage acquisition device.First end plate is connected with support seat, and first end plate is provided with first gas inlet, second gas inlet, first gas outlet, second gas outlet, liquid inlet and liquid outlet.Second end plate is connected with support seat, and first end plate and second end plate are formed with clamping space between, and single cell is clamped in clamping space.Power component is configured to drive second end plate to move.The one end of first pull rod is connected with first end plate, and the other end of first pull rod is connected with a part of power component.Voltage acquisition device is connected with each single cell, and voltage acquisition device is configured to acquire the voltage of single cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cells, in particular to a fuel cell leakage detection device. BACKGROUND

[0002] The fuel cell stack is composed of a plurality of single cells, and one fuel cell stack contains several, dozens or even hundreds of single cells. In the related art, in order to avoid safety accidents of fuel cells caused by defects of single cells, the single cells are usually detected before the fuel cell is assembled to ensure that the quality of the single cells meets the standard. At present, the test method of the single cell is to detect the leakage of the bipolar plate and the membrane electrode of the single cell by airtight method, and the precision of the airtight detection is usually not high, which cannot timely find the tiny defects. If the single cell with defects is found during the assembly process of the fuel cell, the single cell needs to be repaired, which undoubtedly wastes a part of time cost and manual repair cost. How to more accurately detect the single cell of the fuel cell is a problem to be solved at present. SUMMARY

[0003] The present application provides a fuel cell leakage detection device, which can more accurately detect the single cell of the fuel cell.

[0004] The embodiment of the present application provides a fuel cell leakage detection device, and the fuel cell comprises a plurality of single cells. The fuel cell leakage detection device comprises a supporting seat, a first end plate, a second end plate, a power assembly, a plurality of first pull rods and a voltage acquisition device. The first end plate is connected with the supporting seat, and the first end plate is provided with a first gas inlet, a second gas inlet, a first gas outlet, a second gas outlet, a liquid inlet and a liquid outlet. The second end plate is connected with the supporting seat, and the first end plate and the second end plate form a clamping space therebetween, and the single cell is clamped in the clamping space. The power assembly is configured to drive the second end plate to move. One end of the first pull rod is connected with the first end plate, and the other end of the first pull rod is connected with a part of the power assembly. The voltage acquisition device is connected with each single cell, and the voltage acquisition device is configured to acquire the voltage of the single cell.

[0005] According to the fuel cell leakage detection device in the embodiments of the present application, the leakage of the single cells of the fuel cell can be detected, and in the assembly process, the plurality of single cells can be placed in the clamping space formed between the first end plate and the second end plate, specifically, one end of the plurality of single cells can be attached to the first end plate, the other end of the plurality of single cells can be attached to the second end plate, and the two ends of the first pull rod can be connected to the first end plate and a part of the power assembly respectively, then the power assembly can be driven to move the second end plate, so that the single cells are tightly pressed between the first end plate and the second end plate. In addition, the first gas inlet on the first end plate can be connected to the fuel gas, such as hydrogen, the second gas inlet can be connected to air, the liquid inlet can be connected to the cooling liquid, such as water, the liquid outlet is used to discharge the cooling liquid, the first gas outlet is used to discharge air, and the second gas outlet is used to discharge fuel gas. When the single cells are detected, after the fuel and the oxidant are respectively introduced into the anode and the cathode of the single cells, all the membrane electrodes will generate open circuit voltage, OCV for short, and after the fuel is stopped from being introduced into the anode, the oxidant of the cathode will penetrate into the anode; and after the fuel is stopped from being introduced into the anode, the anode is simultaneously purged by using the purge gas, most of the fuel originally in the bipolar plate flow channel is replaced, and only a small amount of fuel is distributed in the pores of the gas diffusion layer and the electrode surface, so that the fuel in the bipolar plate flow channel is quickly replaced by using the purge gas to purge the anode, and only a small amount of fuel remains in the pores of the gas diffusion layer and the electrode surface; in this way, the oxidant that penetrates from the cathode only needs to reduce the fuel in the pores of the gas diffusion layer and the electrode surface, and the voltage of the membrane electrode will decrease, so that the leakage of each single cell can be detected. The fuel cell leakage detection device in the embodiments can use the above-mentioned electrochemical detection method to detect the voltage of each single cell, and when the collected voltage decreases, the single cell with defects can be accurately positioned. In addition, if the first gas outlet and the second gas outlet are blocked, the air tightness of the single cell can also be detected. It can be seen that the fuel cell leakage detection device in the present application can more accurately detect the leakage of the single cells of the fuel cell.

[0006] In addition, the fuel cell leakage detection device in the embodiments of the present application can also have the following technical features:

[0007] In some embodiments of the present application, the support seat comprises a base, a first support leg and a second support leg, one end of the first support leg and the second support leg is connected with the base, the other end of the first support leg is configured to support the second end plate, the other end of the second support leg is configured to support the power assembly, and the size of the first support leg in the vertical direction is smaller than the size of the second support leg in the vertical direction.

[0008] In some embodiments of the present application, the fuel cell leakage detection device further comprises a plurality of second pull rods, one end of the first pull rod is provided with a first through hole, the second pull rod is arranged in the first through hole, the first end plate is provided with at least one first slot, a part of the first pull rod is arranged in the first slot, a part of the first pull rod is arranged in the first end plate, and a part of the second pull rod is arranged on the side of the first end plate away from the second end plate.

[0009] In some embodiments of the present application, the power assembly is provided with a second slot, a part of the first pull rod away from the first through hole is arranged in the second slot, a part of the first pull rod away from the first through hole is arranged in the power assembly, the first pull rod is further provided with a plurality of second through holes, a part of the second pull rod is arranged in the second through hole, and a part of the second pull rod is arranged on the side of the second end plate away from the first end plate.

[0010] In some embodiments of the present application, the fuel cell leakage detection device further comprises a third pull rod and a support body, the third pull rod is arranged in the support body, and the third pull rod is further arranged in one of the second through holes, the support body is configured to support the single cell.

[0011] In some embodiments of the present application, the power assembly comprises a cylinder and a cylinder pressing plate, the cylinder pressing plate is arranged on the side of the second end plate away from the first end plate, and the cylinder pressing plate is slidably connected with the first pull rod, the cylinder is configured to drive the cylinder pressing plate to move.

[0012] In some embodiments of the present application, the fuel cell leakage detection device further comprises two first support frames and a second support frame, the first support frame is detachably connected with the first end plate and the cylinder pressing plate respectively, the first support frame is formed with a receiving cavity, the second support frame is arranged in the receiving cavity at both ends, and the voltage acquisition device is adjustably connected with the second support frame.

[0013] In some embodiments of the present application, the fuel cell leakage detection device further comprises at least two first adjusting knobs and at least two second adjusting knobs, the first adjusting knob is screwed on the first support frame and abuts against the top surface of one end of the second support frame, and the second adjusting knob is screwed on the first support frame and abuts against the side surface of one end of the second support frame.

[0014] In some embodiments of the present application, the first support frame is provided with an assembly through hole, the first end plate and the cylinder pressure plate are both provided with bolt holes matched with the assembly through hole, and a bolt is arranged in the assembly through hole and connected with the bolt holes.

[0015] In some embodiments of the present application, the base is provided with a plurality of fixing through holes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a fuel cell leakage detection device according to one aspect of the present application;

[0017] Figure 2 is a fuel cell leakage detection device according to another aspect of the present application;

[0018] Figure 3 is a fuel cell leakage detection device according to still another aspect of the present application;

[0019] Figure 4 is Figure 1 is a partial enlarged view of M in FIG.

[0020] The reference signs are as follows:

[0021] 10 - single cell;

[0022] 100 - support base; 101 - fixing through hole; 110 - base; 120 - first support leg; 130 - second support leg;

[0023] 200 - first end plate; 210 - first gas inlet; 220 - second gas inlet; 230 - liquid inlet; 240 - liquid outlet; 250 - first gas outlet; 260 - second gas outlet; 270 - first slot;

[0024] 300 - second end plate;

[0025] 410 - voltage collection device; 420 - first support frame; 421 - first adjusting knob; 422 - second adjusting knob; 423 - assembly through hole; 430 - second support frame;

[0026] 510 - first pull rod; 511 - first through hole; 512 - second through hole; 520 - second pull rod; 530 - third pull rod; 540 - support body;

[0027] 600 - power assembly; 610 - cylinder pressure plate; 620 - second slot. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0030] In the related art, in order to avoid safety accidents of fuel cells caused by defects of single cells, the single cells are usually detected before the fuel cells are assembled to ensure that the quality of the single cells meets the standards. At present, the test method of the single cells is to detect the leakage of the bipolar plate and the membrane electrode of the single cell by airtightness. The precision of the airtightness detection is usually not high, and the small defects cannot be found in time. If the single cell with defects is found during the assembly process of the fuel cell, the single cell needs to be repaired, which undoubtedly wastes a part of time cost and manual repair cost. How to detect the single cell of the fuel cell is a problem to be solved at present.

[0031] Based on this, as shown in Figures 1 to 3 The embodiment of the present application provides a fuel cell leakage detection device. The fuel cell includes a plurality of single cells 10. The fuel cell leakage detection device includes a support seat 100, a first end plate 200, a second end plate 300, a power assembly 600, a plurality of first pull rods 510, and a voltage acquisition device 410. The first end plate 200 is connected with the support seat 100, and the first end plate 200 is provided with a first gas inlet 210, a second gas inlet 220, a first gas outlet 250, a second gas outlet 260, a liquid inlet 230, and a liquid outlet 240. The second end plate 300 is connected with the support seat 100, and a clamping space is formed between the first end plate 200 and the second end plate 300. The single cell 10 is clamped in the clamping space. The power assembly 600 is configured to drive the second end plate 300 to move. One end of the first pull rod 510 is connected with the first end plate 200, and the other end of the first pull rod 510 is connected with a part of the power assembly 600. The voltage acquisition device 410 is connected with each single cell 10, and the voltage acquisition device 410 is configured to acquire the voltage of the single cell 10.

[0032] According to the fuel cell leakage detection device in the embodiments of the present application, the leakage of the single cell 10 of the fuel cell can be detected. During the assembly process, the plurality of single cells 10 can be placed in the clamping space formed between the first end plate 200 and the second end plate 300. Specifically, one end of the plurality of single cells 10 can be attached to the first end plate 200, and the other end of the plurality of single cells 10 can be attached to the second end plate 300. The two ends of the first pull rod 510 can be connected to the first end plate 200 and a part of the power assembly 600, respectively. Then, the power assembly 600 can be driven to move the second end plate 300, so that the single cell 10 is tightly pressed between the first end plate 200 and the second end plate 300. In addition, the first gas inlet 210 on the first end plate 200 can be connected to the fuel gas, such as hydrogen, the second gas inlet 220 can be connected to air, the liquid inlet 230 can be connected to the cooling liquid, such as water, the liquid outlet 240 can be used to discharge the cooling liquid, the first gas outlet 250 can be used to discharge air, and the second gas outlet 260 can be used to discharge fuel gas. When the single cell 10 is detected, the fuel and the oxidant are respectively introduced into the anode and the cathode of the single cell 10. After that, all the membrane electrodes will generate open circuit voltage, which is referred to as OCV. After stopping the introduction of the fuel into the anode, the oxidant of the cathode will penetrate into the anode. At the same time, the anode is purged by using the purge gas after stopping the introduction of the fuel into the anode. Most of the fuel in the anode is in the bipolar plate flow channel, and a small amount of fuel is distributed in the pores of the gas diffusion layer and the electrode surface. The purge gas is used to purge the anode, which can quickly replace the fuel in the bipolar plate flow channel, and only a small amount of fuel remains in the pores of the gas diffusion layer and the electrode surface. In this way, the voltage of the membrane electrode will decrease after the oxidant permeated from the cathode reduces the fuel in the pores of the gas diffusion layer and the electrode surface. Thus, the leakage of each single cell 10 can be detected. The fuel cell leakage detection device in the embodiments of the present application can use the above-mentioned electrochemical detection method to detect the voltage of each single cell 10. When the collected voltage decreases, the defective single cell 10 can be accurately positioned. In addition, if the first gas outlet 250 and the second gas outlet 260 are blocked, the air tightness of the single cell 10 can also be detected. It can be seen that the fuel cell leakage detection device in the present application can more accurately detect the leakage of each single cell 10 of the fuel cell.

[0033] In some embodiments of the present application, the support base 100 comprises a base 110, a first support leg 120 and a second support leg 130, one end of the first support leg 120 and the second support leg 130 are connected with the base 110, the other end of the first support leg 120 is configured to support the second end plate 300, the other end of the second support leg 130 is configured to support the power assembly 600, the size of the first support leg 120 in the vertical direction is smaller than the size of the second support leg 130 in the vertical direction. In the present embodiment, the first support leg 120 and the second support leg 130 can be fixedly connected with the base 110, or can be connected in a detachable manner, for example, the base 110 can be integrally formed with the first support leg 120 and the second support leg 130, or can be connected by bolt fastening, which is not particularly limited here. The size of the first support leg 120 in the vertical direction is smaller than the size of the second support leg 130 in the vertical direction, that is, when the fuel cell is subjected to leakage detection, the height of the power assembly 600 is greater than the height of the first end plate 200, so that the fuel cell as a whole can be in an inclined structure, so that the monomer battery 10 can be positioned by using its own weight, so as to facilitate the installation of the monomer battery 10.

[0034] In some embodiments of the present application, the fuel cell leakage detection device further comprises a plurality of second pull rods 520, one end of the first pull rod 510 is provided with a first through hole 511, the second pull rod 520 is arranged in the first through hole 511, and the first end plate 200 is provided with at least one first slot 270, part of the first pull rod 510 is accommodated in the first slot 270, part of the first pull rod 510 is arranged in the first end plate 200, and part of the second pull rod 520 is arranged on the side of the first end plate 200 away from the second end plate 300. During the installation of the detection device, the second pull rod 520 can be arranged in the first through hole 511 of the first pull rod 510 first, then the second pull rod 520 is arranged in the first slot 270, and the second pull rod 520 is arranged on the side of the first end plate 200 away from the second end plate 300. When the power assembly 600 drives the second end plate 300 to move, the second pull rod 520 abuts against the first end plate 200, so that the monomer battery 10 clamped in the clamping space is tightly attached, so as to avoid the gap between the monomer batteries 10 to cause inaccurate test. In addition, since the first pull rod 510 and the second pull rod 520 are connected in a detachable manner, and the second pull rod 520 abuts against one side of the first end plate 200, the disassembly and assembly of the detection device is more convenient.

[0035] In some embodiments of the present application, the power assembly 600 is provided with a second slot 620, and a portion of the first pull rod 510 away from the first through hole 511 is accommodated in the second slot 620. A portion of the first pull rod 510 away from the first through hole 511 is arranged on the power assembly 600, and the first pull rod 510 is further provided with a plurality of second through holes 512. A portion of the second pull rod 520 is arranged in the second through hole 512, and a portion of the second pull rod 520 is arranged on the side of the second end plate 300 away from the first end plate 200. In the embodiment, the second pull rod 520 is further provided with a plurality of second through holes 512. In some specific embodiments, the second through holes 512 can be arranged at equal intervals. When the single cell 10 of the fuel cell is detected, the first pull rod 510 can be arranged in the second through hole 512 at different positions according to the number of the single cell 10, so that different numbers of single cells 10 can be detected flexibly.

[0036] In some specific embodiments, the number of the first pull rod 510 is ten, and the number of the second pull rod 520 is four. Five first pull rods 510 are arranged on the top of the single cell 10, and the other five first pull rods 510 are arranged on the bottom of the single cell 10. Two second pull rods 520 are arranged in the first through hole 511 of the first pull rod 510 on the top, and the other two second pull rods 520 are arranged in the first through hole 511 of the first pull rod 510 on the bottom, so that the single cell 10 can be fixed more firmly. The fuel cell leakage detection device of the embodiment can detect about 200 to 300 single cells 10.

[0037] In some embodiments of the present application, the fuel cell leakage detection device further comprises a third pull rod 530 and a support body 540. The third pull rod 530 is arranged in the support body 540, and the third pull rod 530 is further arranged in one of the second through holes 512. The support body 540 is configured to support the single cell 10. In the embodiment, the third pull rod 530 is arranged on the bottom of the single cell 10, and the support body 540 is arranged on the third pull rod 530, so that the single cell 10 can be supported. In some specific embodiments, the support body 540 has a cylindrical structure, and the surface of the cylindrical support body 540 has a certain curvature, so that the single cell 10 can be prevented from being damaged.

[0038] In some embodiments of the present application, the power assembly 600 comprises a cylinder and a cylinder pressure plate 610, the cylinder pressure plate 610 is arranged on the side of the second end plate 300 away from the first end plate 200, and the cylinder pressure plate 610 is slidably connected with the first pull rod 510, and the cylinder is configured to drive the cylinder pressure plate 610 to move. In the present embodiment, the cylinder pressure plate 610 can slide along the first pull rod 510, that is, when the cylinder drives the cylinder pressure plate 610 to move, it will slide along the first pull rod 510, so as to push the second end plate 300 and clamp the single battery 10 clamped between the second end plate 300 and the first end plate 200, so as to avoid the gap between the single battery 10 and the first end plate 200 or the second end plate 300. In addition, the power assembly 600 can also comprise a pressure gauge, a pipeline and other equipment, which are not specially limited here.

[0039] As shown in Figure 4 In some embodiments of the present application, the fuel cell leakage detection device further comprises two first support frames 420 and a second support frame 430, the first support frame 420 is detachably connected with the first end plate 200 and the cylinder pressure plate 610 respectively, the first support frame 420 is formed with a receiving cavity, the two ends of the second support frame 430 are arranged in the receiving cavities respectively, and the voltage acquisition device 410 is adjustably connected with the second support frame 430. In the present embodiment, after the single battery 10 is clamped in the clamping space formed by the first end plate 200 and the second end plate 300, the first support frame 420 can be installed on the first end plate 200 and the cylinder pressure plate 610, the second support frame 430 is fixed on the first support frame 420, and the voltage acquisition device 410 is fixed on the second support frame 430. In some specific embodiments, the first support frame 420 can be installed on the side wall of the first end plate 200 or the cylinder pressure plate 610 by screw fastening, then one end of the second support frame 430 is sleeved in the receiving cavity of the first support frame 420, and the other end is sleeved on the other first support frame 420, then the other first support frame 420 can be installed on the cylinder pressure plate 610 or the first end plate 200 by screw fastening, and finally the voltage acquisition device 410 is installed on the second support frame 430. In the present embodiment, the receiving cavity can be a hole structure or a groove structure formed on the first support frame 420, which is not specially limited here, as long as the two ends of the second support frame 430 can be accommodated in the receiving cavity. The first support frame 420 and the second support frame 430 can form a good support structure, so as to provide good support for the voltage acquisition device 410.

[0040] In some embodiments of the present application, the fuel cell leakage detection device further comprises at least two first adjusting knobs 421 and at least two second adjusting knobs 422, the first adjusting knobs 421 are screwed on the first support frame 420 and abut against the top surface of one end of the second support frame 430, and the second adjusting knobs 422 are screwed on the first support frame 420 and abut against the side surface of one end of the second support frame 430. In the present embodiment, the first adjusting knobs 421 and the second adjusting knobs 422 abut against the top surface and the side surface of the second support frame 430 respectively, so that the second support frame 430 can be firmly fixed in the accommodating cavity of the first support frame 420.

[0041] In some embodiments of the present application, the first support frame 420 is provided with an assembly through hole 423, the first end plate 200 and the cylinder pressing plate 610 are both provided with bolt holes matched with the assembly through hole 423, and the bolt is arranged through the assembly through hole 423 and connected with the bolt hole. In the present embodiment, the assembly through hole 423 is arranged on the first support frame 420, and the first support frame 420 is fixed on the first end plate 200 or the cylinder pressing plate 610 through the fastening bolt, so that the design is convenient to disassemble and assemble.

[0042] In some embodiments of the present application, the base 110 is provided with a plurality of fixing through holes 101. In the present embodiment, the fixing through holes 101 on the base 110 can be used to connect with the first support leg 120 and the second support leg 130, for example, the bolt holes can be arranged on the first support leg 120 and the second support leg 130, the bolt is arranged through the fixing through holes 101 and connected with the bolt holes, so that the first support leg 120 and the second support leg 130 can be fixed on the base 110.

[0043] The present application is described by several specific embodiments, and those skilled in the art should understand that various modifications and equivalent replacements can be made to the present application without departing from the scope of the present application. In addition, various modifications can be made to the present application for specific situations or specific conditions without departing from the scope of the present application. Therefore, the present application is not limited to the disclosed specific embodiments, but should include all the embodiments falling within the scope of the claims of the present application.

Claims

1. A fuel cell leakage detection device for detecting individual cells before fuel cell assembly, wherein the fuel cell comprises multiple individual cells, characterized in that, The fuel cell leakage detection device includes: Support base; A first end plate is connected to the support base. The first end plate is provided with a first air inlet, a second air inlet, a first air outlet, a second air outlet, a liquid inlet, and a liquid outlet. The second end plate is connected to the support base, and a clamping space is formed between the first end plate and the second end plate, in which the single battery cell is clamped; A power assembly configured to drive the second end plate to move; Multiple first tie rods, one end of which is connected to the first end plate, and the other end of which is connected to a portion of the power assembly; A voltage acquisition device is connected to each of the individual cells and is configured to acquire the voltage of the individual cells.

2. The fuel cell leak detection device according to claim 1, characterized in that, The support base includes a base, a first support leg, and a second support leg. One end of both the first and second support legs is connected to the base. The other end of the first support leg is configured to support the second end plate, and the other end of the second support leg is configured to support the power assembly. The vertical dimension of the first support leg is smaller than that of the second support leg.

3. The fuel cell leak detection device according to claim 1, characterized in that, The fuel cell leak detection device further includes multiple second pull rods. One end of the first pull rod is provided with a first through hole, and the second pull rod passes through the first through hole. At least one first strip groove is provided on the first end plate, wherein a portion of the first pull rod is accommodated in the first strip groove, a portion of the first pull rod passes through the first end plate, and a portion of the second pull rod is provided on the side of the first end plate away from the second end plate.

4. The fuel cell leak detection device according to claim 3, characterized in that, The power assembly is provided with a second strip groove, wherein a portion of the first pull rod at the end away from the first through hole is accommodated in the second strip groove, and a portion of the first pull rod at the end away from the first through hole passes through the power assembly. The first pull rod is also provided with a plurality of second through holes, wherein a portion of the second pull rod passes through the second through holes, and a portion of the second pull rod is located on the side of the second end plate away from the first end plate.

5. The fuel cell leak detection device according to claim 4, characterized in that, The fuel cell leak detection device further includes a third tie rod and a support body. The third tie rod passes through the support body and also passes through one of the second through holes. The support body is configured to support the single cell.

6. The fuel cell leak detection device according to claim 1, characterized in that, The power assembly includes a cylinder and a cylinder plate. The cylinder plate is disposed on the side of the second end plate away from the first end plate, and the cylinder plate is slidably connected to the first tie rod. The cylinder is configured to drive the cylinder plate to move.

7. The fuel cell leak detection device according to claim 6, characterized in that, The fuel cell leak detection device further includes two first support frames and a second support frame. The first support frame is detachably connected to the first end plate and the cylinder pressure plate, respectively. A receiving cavity is formed on the first support frame. The two ends of the second support frame are respectively disposed in the receiving cavity. The voltage acquisition device is connected to the second support frame in an adjustable manner.

8. The fuel cell leak detection device according to claim 7, characterized in that, The fuel cell leak detection device further includes at least two first adjustment knobs and at least two second adjustment knobs. The first adjustment knobs are screwed onto the first support frame and abut against the top surface of one end of the second support frame. The second adjustment knobs are screwed onto the first support frame and abut against the side surface of one end of the second support frame.

9. The fuel cell leak detection device according to claim 7, characterized in that, The first support frame is provided with an assembly through hole, and both the first end plate and the cylinder pressure plate are provided with bolt holes that are adapted to the assembly through hole. The bolts pass through the assembly through hole and are connected to the bolt holes.

10. The fuel cell leak detection device according to claim 2, characterized in that, The base is provided with multiple fixing through holes.

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