Airtightness detection device for unipolar plate of fuel cell

Abstract

The utility model relates to a fuel cell monopole plate air tightness detection device, comprising a first cover plate, a second cover plate, a third cover plate and a fourth cover plate, the first cover plate is provided with a first detection surface, the first detection surface is provided with a detection groove, the first cover plate is provided with a first hole channel, and an outlet of the first hole channel is communicated with the detection groove; a second cover plate; the first driving part can drive at least one of the first cover plate and the second cover plate to move in the first direction; an outlet of the fluid injection device is communicated with an inlet of the first hole channel, and the fluid injection device can inject detection fluid into the detection groove; and the pressure detector is used for detecting the pressure in a detection cavity defined by the detection groove and the polar plate to be detected. Therefore, the fuel cell monopolar plate airtightness detection device has the advantage of being convenient for detecting the airtightness of the polar plate.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an airtightness detection device for a single-pole plate of a fuel cell. Background Art

[0002] As a core component of a proton exchange membrane fuel cell stack, the plate must separate the fuel and oxidant to prevent gas permeation; collect and conduct current; evenly distribute gas to the electrode reaction layer for electrode reaction; dissipate heat to maintain a uniform temperature field in the cell; be corrosion-resistant; resist shock and vibration; and be easily machined. Therefore, the plate must be free of through-hole cracks to prevent gas and cooling water leakage. Related art plate airtightness testing methods are primarily used to detect cross-flow within the three cavities of the bipolar plate to characterize the quality of bipolar plate welds. For characterizing cracks that develop after forming a unipolar plate, penetrant testing is primarily used. Based on the principle of capillary action, penetrant testing can detect leaks in the gas-water cavity of the plate by observing the penetration of penetrant fluid through the other side of the plate. However, this method suffers from low detection efficiency and insufficient accuracy. Furthermore, the presence of openings such as manifolds in the unipolar plate limits its application: the plate's sealing must be ensured during the airtightness test, and the sealing of these openings, such as the manifold, can affect the accuracy of the airtightness test. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a fuel cell monopolar plate airtightness detection device.

[0004] The fuel cell monopolar plate airtightness detection device of the embodiment of the utility model comprises:

[0005] a first cover plate, the first cover plate having a first detection surface, a detection slot on the first detection surface, a first hole in the first cover plate, and an outlet of the first hole communicating with the detection slot;

[0006] a second cover plate, wherein the thickness directions of the second cover plate and the first cover plate are both in the first direction, the second cover plate and the first cover plate are arranged relative to each other in the first direction, the first detection surface and the opening of the detection slot face the second cover plate in the first direction, and the first cover plate and the second cover plate are movable relative to each other in the first direction so that the first cover plate and the second cover plate have a detection position and a release position, in which the second cover plate presses the electrode plate to be detected onto the first detection surface and causes the electrode plate to be detected to cover the opening of the detection slot, and in the release position, the first cover plate and the second cover plate are spaced apart;

[0007] a first driving portion, the first driving portion being capable of driving at least one of the first cover plate and the second cover plate to move in the first direction;

[0008] a fluid injection device, wherein the outlet of the fluid injection device is connected to the inlet of the first channel, and the fluid injection device can inject the detection fluid into the detection tank;

[0009] A pressure detector is used to detect the pressure in the detection cavity defined by the detection groove and the electrode to be detected.

[0010] Therefore, the fuel cell monopolar plate airtightness detection device according to the embodiment of the present invention has the advantage of being able to easily detect the airtightness of the plate.

[0011] In some embodiments, the thickness directions of the second cover plate and the first cover plate are both up and down directions;

[0012] The first cover plate is located on the lower side of the second cover plate, and the openings of the first detection surface and the detection slot face upward;

[0013] The first driving portion may drive at least one of the first cover plate and the second cover plate to move in a vertical direction.

[0014] In some embodiments, the first detection surface is a plane, and an annular sealing strip is provided on the first detection surface, and the sealing strip and the first detection surface define the detection groove;

[0015] The outlet of the first channel is opened on the first detection surface, and the outlet of the first channel is located on the inner side of the sealing strip;

[0016] The fluid injection device is an inflation device;

[0017] The pressure detector is a gas pressure detector.

[0018] In some embodiments, a positioning portion is provided on the first cover plate, and the positioning portion is used to position the electrode plate to be detected.

[0019] In some embodiments, the first detection surface has a plurality of cover plate positioning holes, the number and positions of the plurality of cover plate positioning holes are adapted to the number and positions of the plurality of plate positioning holes on the plate to be detected, and the first cover plate is positioned on the plate to be detected by pins inserted through the plate positioning holes and the cover plate positioning holes;

[0020] The shape and size of the detection groove are adapted to the portion of the electrode plate to be detected, and the electrode plate manifold port and the electrode plate air port of the electrode plate to be detected positioned on the first detection surface are located outside the detection groove.

[0021] The fuel cell monopolar plate airtightness detection device of an embodiment of the present utility model includes a second driving unit, the first driving unit can drive one of the first cover plate and the second cover plate to move in the up and down direction, and the second driving unit can drive the other of the first cover plate and the second cover plate to move in a second direction, and the second direction is perpendicular to the up and down direction.

[0022] In some embodiments, the second driving portion includes a bottom plate, a slide rail, a first connecting plate, and a first driver, wherein the thickness direction of the bottom plate is the up-down direction, the slide rail is provided on the upper surface of the bottom plate, and the slide rail extends along the second direction, the thickness direction of the first connecting plate is the up-down direction, the first connecting plate is slidably provided on the slide rail along the second direction, the first driver can drive the first connecting plate to move in the second direction, and the first cover plate is provided above the first connecting plate;

[0023] The cam is mounted on a base plate and has a first end fixed to the bottom plate, the second end being mounted on a base plate and a second end being connected to the base plate by a second drive mechanism.

[0024] In some embodiments, a first limiting member and a second limiting member are provided on the bottom plate, and the first limiting member and the second limiting member are located on both sides of the first connecting plate in the second direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present utility model.

[0026] Figure 2 It is a front view of a fuel cell monopolar plate airtightness detection device according to an embodiment of the utility model.

[0027] Figure 3 It is a top view of the fuel cell monopolar plate airtightness detection device according to an embodiment of the utility model.

[0028] Figure 4Schematic diagram of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present utility model.

[0029] Figure 5 This is a diagram of the use status of the fuel cell monopolar plate airtightness detection device according to an embodiment of the present utility model.

[0030] Reference numerals:

[0031] 1. First cover plate, 11. First detection surface, 12. Detection groove, 13. Sealing strip, 14. First channel, 15. Cover plate positioning hole;

[0032] 2. Second cover plate;

[0033] 3. Bottom plate, 31. Slide rail, 32. First connecting plate, 33. First driver, 34. First limiting member, 35. Second limiting member;

[0034] 4. Fixed plate, 41. Second connecting plate, 42. Second driver, 43. Support rod, 44. Guide rod;

[0035] 5. Plate, 51. Manifold port. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] The following describes the fuel cell monopolar plate airtightness detection device according to the embodiment of the utility model with reference to the accompanying drawings. Figures 1 to 5 As shown, the fuel cell monopolar plate airtightness detection device according to an embodiment of the present utility model includes a first cover plate 1, a second cover plate 2, a first driving part, a fluid injection device and a pressure detector.

[0038] The first cover plate 1 has a first detection surface 11 , a detection groove 12 is formed on the first detection surface 11 , and the first cover plate 1 has a first channel 14 , an outlet of the first channel 14 is connected to the detection groove 12 .

[0039] The thickness direction of the second cover plate 2 and the first cover plate 1 are both in the first direction, and the second cover plate 2 and the first cover plate 1 are arranged relative to each other in the first direction. The openings of the first detection surface 11 and the detection slot 12 face the second cover plate 2 in the first direction. The first cover plate 1 and the second cover plate 2 can move relative to each other in the first direction so that the first cover plate 1 and the second cover plate 2 have a detection position and a release position. In the detection position, the second cover plate 2 presses the plate 5 to be detected against the first detection surface 11 and causes the plate 5 to be detected to cover the opening of the detection slot 12, so that the plate 5 to be detected and the detection slot 12 define a detection cavity. In the release position, the first cover plate 1 and the second cover plate 2 are spaced apart. Specifically, the shape and size of the detection slot 12 are adapted to the portion of the plate 5 to be detected that needs to be detected. The portion of the plate 5 to be detected that covers the detection slot 12 is the portion that needs to be detected. When the plate 5 to be detected covers the detection slot 12, the manifold port 51 and the air port of the plate 5 to be detected are located outside the detection slot 12.

[0040] The first driving portion can drive at least one of the first cover plate 1 and the second cover plate 2 to move in the first direction, that is, the first driving portion can drive the second cover plate 2 and the first cover plate 1 to move from the release position to the detection position.

[0041] The outlet of the fluid injection device is connected to the inlet of the first channel 14, and the fluid injection device can inject the detection fluid into the detection tank 12. The pressure detector is used to detect the pressure in the detection cavity defined by the detection tank 12 and the plate 5 to be detected. That is to say, the fluid injection device can inject the detection fluid into the detection cavity defined by the detection plate and the detection tank 12 through the first channel 14. The detection fluid can be a liquid or a gas. The detection fluid fills the detection cavity and makes the initial pressure in the detection cavity a preset pressure. Then, the preset pressure in the detection cavity is monitored by the pressure detector. If there is no obvious change within a certain period of time, it means that the plate 5 to be detected has good air tightness. For example, the detection fluid is a gas.

[0042] Therefore, the fuel cell monopolar plate airtightness detection device according to the embodiment of the present invention has the advantage of being able to easily detect the airtightness of the plate.

[0043] like Figures 1 to 5As shown, in some embodiments, the thickness direction of the second cover plate 2 and the first cover plate 1 are both vertical. The first cover plate 1 is located below the second cover plate 2, with the openings of the first inspection surface 11 and the inspection slot 12 facing upward. The first drive unit can drive at least one of the first and second cover plates 1 and 2 to move vertically. This facilitates placement of the plate 5 to be inspected directly on the first inspection surface 11 of the first cover plate 1, with the portion of the plate 5 to be inspected covering the inspection slot 12, and the manifold port 51 and air port of the plate 5 to be inspected located outside the inspection slot 12. The first drive unit then drives at least one of the first and second cover plates 1 and 2 to move vertically, fully pressing the plate 5 to be inspected against the first cover plate 1. This allows the inspection slot 12 and the plate 5 to be inspected to define a sealed inspection cavity. During inspection, if the sealed inspection cavity does not significantly decrease within a certain period of time, it indicates that the plate 5 to be inspected is airtight, i.e., the inspection plate 5 is airtight.

[0044] In some embodiments, a positioning portion is provided on the first cover plate 1, and the positioning portion is used to position the plate to be tested 5. Specifically, the first detection surface 11 has a plurality of cover plate positioning holes 15, the number and position of the plurality of cover plate positioning holes 15 being adapted to the number and position of the plurality of plate positioning holes on the plate to be tested 5. The first cover plate 1 positions the plate to be tested 5 by means of pins that penetrate through the plate positioning holes and the cover plate positioning holes 15. Specifically, the pins are installed in the cover plate positioning holes 15, the plate to be tested 5 is placed on the first cover plate 1, and the plurality of plate positioning holes on the plate to be tested 5 are aligned with the plurality of pins on the first detection surface 11, so that the positioning pins can be inserted into the plate positioning holes to complete the positioning.

[0045] like Figures 1 to 5 As shown, in some embodiments, the first inspection surface 11 is a flat (horizontal) plane. An annular sealing strip 13 is provided on the first inspection surface 11. The sealing strip 13 and the first inspection surface 11 define an inspection slot 12. Specifically, the shape and size of the annular sealing strip 13 match the shape and size of the plate 5 to be inspected, thereby ensuring that the shape and size of the inspection slot 12 match the portion of the plate 5 to be inspected. The plate manifold opening 51 and the air port of the plate 5 to be inspected, positioned on the first inspection surface 11, are located outside the inspection slot 12 (the sealing strip 13). This facilitates inspection by eliminating the need to block the plate manifold opening 51 and the air port, and provides greater stability during inspection. The sealing strip 13 is made of a flexible material that can elastically deform to ensure a good seal. For example, the sealing strip 13 is made of rubber. A sealing groove is provided on the first inspection surface 11 for mounting the sealing strip 13. The shape of the sealing groove matches that of the sealing strip 13, and the lower portion of the sealing strip 13 is located within the sealing groove.

[0046] The outlet of the first channel 14 is provided on the first detection surface 11 and is located on the inner side of the sealing strip 13. Specifically, the inlet of the first channel 14 is provided on the side of the first cover plate 1. The fluid injection device is an inflation device, and the pressure detector is a gas pressure detector. The inflation device can inject gas into the sealed detection cavity defined by the detection tank 12 and the electrode plate 5 to be detected through the first channel 14. The detection head of the pressure detector can be located in the detection tank 12, the first channel 14, or the inflation device.

[0047] like Figures 1 to 5 As shown, the fuel cell monopolar plate airtightness detection device includes a second drive unit. The first drive unit can drive one of the first cover plate 1 and the second cover plate 2 to move in the vertical direction, and the second drive unit can drive the other of the first cover plate 1 and the second cover plate 2 to move in a second direction, where the second direction is perpendicular to the vertical direction. Specifically, the second direction is horizontal. As a result, after the electrode plate 5 to be tested is placed on the first cover plate 1, the second drive unit can drive the other of the first cover plate 1 and the second cover plate 2 to move in the second direction so that the first cover plate 1 is directly below the second cover plate 2; then the first drive unit can drive one of the first cover plate 1 and the second cover plate 2 to move in the vertical direction so that the second cover plate 2 presses the electrode plate to be tested 5 against the first cover plate 1. The second direction can be a front-to-back direction, as shown by the arrows in the figure. For example, the second drive unit can drive the other of the first cover plate 1 and the second cover plate 2 to move in the front-to-back direction.

[0048] like Figures 1 to 5 As shown, in some embodiments, the second driving portion includes a base plate 3 , a slide rail 31 , a first connecting plate 32 , and a first driver 33 .

[0049] The thickness direction of the base plate 3 is vertical, and the slide rails 31 are provided on the upper surface of the base plate 3, extending in the second direction. The thickness direction of the first connecting plate 32 is vertical, and the first connecting plate 32 is slidably provided on the slide rails 31 in the second direction. The first driver 33 can drive the first connecting plate 32 to move in the second direction, and the first cover plate 1 is provided above the first connecting plate 32. Specifically, the first driver 33 includes a motor and a screw drive. The motor can drive the first connecting plate 32 to move on the two slide rails 31 via the screw drive, thereby driving the first cover plate 1 to move in the second direction. For example, the slide rails 31 move in the front-to-back direction, and the two slide rails 31 are arranged side by side in the left-to-right direction.

[0050] The first driving portion includes a fixing plate 4 , a second connecting plate 41 and a second driver 42 .

[0051] The thickness of the fixed plate 4 is oriented vertically. The fixed plate 4 is positioned above the base plate 3 and is connected to the fixed plate 3 via multiple support rods 43. A second actuator 42 is provided on the fixed plate 4 and includes a drive shaft that can move in the vertical direction. The thickness of the second connecting plate 41 is oriented vertically. The second connecting plate 41 is positioned below the fixed plate 4 and is connected to the drive shaft of the second actuator 42. The second connecting plate 41 is provided with two guide rods 44 extending in the vertical direction, which are slidably connected to the fixed plate 4 in the vertical direction. The second cover plate 2 is positioned below the second connecting plate 41. The dimensions of the fixed plate 4 and the second connecting plate 41 in the second direction are smaller than those of the slide rails 31 in the second direction. The first actuator 33 can move the first cover plate 1 directly below the second cover plate 2. Specifically, the fixed plate 4 and the second connecting plate 41 are positioned to one side of the base plate 3 in the second direction. The second actuator 42 is a pneumatic cylinder, and the fixed plate 4 is connected to the fixed plate 4 via four support rods 43. For example, the fixed plate 4 and the second connecting plate 41 are positioned in front of the base plate 3 in the front-to-back direction.

[0052] For example, after the plate to be tested 5 is placed on the first cover plate 1, the first driver 33 can drive the first connecting plate 32 and the first cover plate 1 to move forward to just below the second cover plate 2, and then the second driver 42 drives the second connecting plate 41 and the second cover plate 2 to move downward, so that the second cover plate 2 presses the plate to be tested 5 downward onto the first cover plate 1, thereby making the detection slot 12 and the plate to be tested 5 define a closed detection cavity.

[0053] In some embodiments, the bottom plate 3 is provided with a first stopper 34 and a second stopper 35. The first stopper 34 and the second stopper 35 are located on either side of the first connecting plate 32 in the second direction. Specifically, the first stopper 34 and the second stopper 35 are plate-shaped with a thickness in the second direction. The first stopper 34 and the second stopper 35 can limit the position of the first connecting plate 32. For example, the first stopper 34 and the second stopper 35 are located on either side of the first connecting plate 32 in the front-to-back direction.

[0054] The present invention also provides a fuel cell monopolar plate airtightness detection method using the fuel cell monopolar plate airtightness detection device according to the embodiment of the present invention. The fuel cell monopolar plate airtightness detection method according to the embodiment of the present invention includes the following steps:

[0055] The first driving unit drives at least one of the first cover plate 1 and the second cover plate 2 to move in a first direction, so that the second cover plate 2 presses the plate to be tested 5 against the first testing surface 11 of the first cover plate 1, so that the plate to be tested 5 covers the opening of the testing slot 12 on the first testing surface 11. For example, the second cover plate 2 presses the plate to be tested 5 downward against the first testing surface 11 of the first cover plate 1, so that the testing slot 12 and the plate to be tested 5 define a sealed testing cavity, completing the sealing of the center position of the plate to be tested excluding open areas such as the manifold port 51 and the gas port of the plate to be tested 5.

[0056] The fluid injection device introduces fluid into the detection cavity defined by the detection slot 12 and the electrode plate to be detected 5 through the first channel 14 on the first cover plate 1, and makes the (initial) pressure in the detection cavity be a first preset value. Specifically, the first preset value is greater than or equal to 100 kPa and less than or equal to 200 kPa. The fluid injection device is an inflation device, which introduces gas into the detection cavity through the first channel 14, and makes the pressure in the detection cavity greater than or equal to 100 kPa and less than or equal to 200 kPa. The pressure detector is a gas pressure detector. That is, the initial gas pressure in the detection cavity can be made the first preset value. For example, the (initial) pressure in the detection cavity is made 150 kPa.

[0057] The pressure within the test chamber is monitored using a pressure detector. After a second preset time, the change in pressure within the test chamber is used to determine the airtightness of the electrode plate 5 to be tested. Specifically, the second preset time is greater than or equal to 10 seconds and less than or equal to 30 seconds. If there is no (significant) change in pressure within the test chamber after 10 seconds (and within 30 seconds), the airtightness of the monopolar plate is good.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0063] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present invention.

Claims

1. A fuel cell monopolar plate airtightness detection device, characterized in that: include: a first cover plate, the first cover plate having a first detection surface, a detection slot on the first detection surface, a first hole in the first cover plate, and an outlet of the first hole communicating with the detection slot; a second cover plate, wherein the thickness directions of the second cover plate and the first cover plate are both in the first direction, the second cover plate and the first cover plate are arranged relative to each other in the first direction, the first detection surface and the opening of the detection slot face the second cover plate in the first direction, and the first cover plate and the second cover plate are movable relative to each other in the first direction so that the first cover plate and the second cover plate have a detection position and a release position, in which the second cover plate presses the electrode plate to be detected onto the first detection surface and causes the electrode plate to be detected to cover the opening of the detection slot, and in the release position, the first cover plate and the second cover plate are spaced apart; a first driving portion, the first driving portion being capable of driving at least one of the first cover plate and the second cover plate to move in the first direction; a fluid injection device, wherein the outlet of the fluid injection device is connected to the inlet of the first channel, and the fluid injection device can inject the detection fluid into the detection tank; A pressure detector is used to detect the pressure in the detection cavity defined by the detection groove and the electrode to be detected.

2. The fuel cell monopolar plate airtightness detection device according to claim 1, characterized in that: The thickness directions of the second cover plate and the first cover plate are both up and down directions; The first cover plate is located on the lower side of the second cover plate, and the openings of the first detection surface and the detection slot face upward; The first driving portion may drive at least one of the first cover plate and the second cover plate to move in a vertical direction.

3. The fuel cell monopolar plate airtightness detection device according to claim 2, characterized in that: The first detection surface is a plane, and an annular sealing strip is provided on the first detection surface, and the sealing strip and the first detection surface define the detection groove; The outlet of the first channel is opened on the first detection surface, and the outlet of the first channel is located on the inner side of the sealing strip; The fluid injection device is an inflation device; The pressure detector is a gas pressure detector.

4. The fuel cell monopolar plate airtightness detection device according to claim 2, characterized in that: A positioning portion is provided on the first cover plate, and the positioning portion is used to position the electrode plate to be detected.

5. The fuel cell monopolar plate airtightness detection device according to claim 4, characterized in that: The first detection surface has a plurality of cover plate positioning holes, the number and positions of the plurality of cover plate positioning holes are adapted to the number and positions of the plurality of plate positioning holes on the plate to be detected, and the first cover plate is positioned for the plate to be detected by pins inserted through the plate positioning holes and the cover plate positioning holes; The shape and size of the detection groove are adapted to the portion of the electrode plate to be detected, and the electrode plate manifold port and the electrode plate air port of the electrode plate to be detected positioned on the first detection surface are located outside the detection groove.

6. The fuel cell monopolar plate airtightness detection device according to any one of claims 3 to 5, characterized in that: A second driving unit is included, the first driving unit can drive one of the first cover plate and the second cover plate to move in the up and down direction, and the second driving unit can drive the other of the first cover plate and the second cover plate to move in a second direction, and the second direction is perpendicular to the up and down direction.

7. The fuel cell monopolar plate airtightness detection device according to claim 6, characterized in that: The second driving portion includes a bottom plate, a slide rail, a first connecting plate, and a first driver. The thickness direction of the bottom plate is the up-down direction. The slide rail is provided on the upper surface of the bottom plate and extends along the second direction. The thickness direction of the first connecting plate is the up-down direction. The first connecting plate is slidably provided on the slide rail along the second direction. The first driver can drive the first connecting plate to move in the second direction. The first cover plate is provided above the first connecting plate. The cam is mounted on a base plate and has a first end fixed to the bottom plate, the second end being mounted on a base plate and a second end being connected to the base plate by a second drive mechanism.

8. The fuel cell monopolar plate airtightness detection device according to claim 7, characterized in that: The bottom plate is provided with a first limiting member and a second limiting member, and the first limiting member and the second limiting member are located on both sides of the first connecting plate in the second direction.

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