Fuel cell monopolar plate airtightness detection device and detection method

Abstract

The invention provides a fuel cell monopolar plate airtightness detection device and detection method. The fuel cell monopole plate airtightness detection device comprises a first 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 that the airtightness of the polar plate can be conveniently detected.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell monopolar plate airtightness detection device and detection method. Background Art

[0002] As one of the core components of the proton exchange membrane fuel cell stack, the plate needs to have the characteristics of separating fuel and oxidant to prevent gas from penetrating; collecting and conducting current; evenly distributing gas to the reaction layer of the electrode for electrode reaction; discharging heat to keep the battery temperature field uniform; corrosion resistance; shock and vibration resistance; easy machining, etc. Therefore, it is required that there should be no through cracks inside the monopolar plate to avoid leakage of gas and cooling water. In the related art, the plate airtightness detection method is mainly used to detect the three-cavity cross-gas situation of the bipolar plate to characterize the welding quality of the bipolar plate. For the characterization of cracks generated after the monopolar plate is formed, the permeate detection method is mainly used. Based on the principle of capillary action, by observing the penetration of the permeate on the other side of the plate, the leakage position of the gas-water cavity of the monopolar plate can be detected. However, this method has problems such as low detection efficiency and insufficient detection accuracy. In addition, the existence of opening structures such as manifold ports in the monopolar plate limits the application of the monopolar plate airtightness detection method: the sealing of the plate needs to be ensured during the single plate airtightness detection process, and the blocking of the opening positions such as the manifold ports will affect the accuracy of the airtightness detection. Summary of the invention

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

[0004] The fuel cell monopolar plate airtightness detection device according to the embodiment of the present invention comprises:

[0005] A first cover plate, wherein the first cover plate has a first detection surface, the first detection surface has a detection groove, the first cover plate has a first hole, and an outlet of the first hole is connected to the detection groove;

[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 opposite 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, the first cover plate and the second cover plate can move 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 makes the electrode plate to be detected cover the opening of the detection slot, and in which the first cover plate and the second cover plate are arranged at intervals;

[0007] a first driving unit, wherein the first driving unit can drive 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 groove;

[0009] A pressure detector is used to detect the pressure in the detection cavity defined by the detection groove and the electrode plate 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 convenient for detecting 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-down directions;

[0012] The first cover plate is located at 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, 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 hole is opened on the first detection surface, and the outlet of the first hole 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 position of the plurality of cover plate positioning holes match the number and position of the plurality of plate positioning holes on the plate to be detected, and the first cover plate positions the plate to be detected by means of 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 part 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 invention 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 part 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 arranged on the upper surface of the bottom plate, 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 arranged 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 arranged above the first connecting plate;

[0023] The first driving part includes a fixed plate, a second connecting plate and a second driver, the thickness direction of the fixed plate is the up and down direction, the fixed plate is located above the bottom plate, the fixed plate is connected by a plurality of support rods, the second driver is arranged on the fixed plate, the second driver has a driving shaft which can move in the up and down direction, the thickness direction of the second connecting plate is the up and down direction, the second connecting plate is located below the fixed plate, the second connecting plate is connected to the driving shaft of the second driver, a guide rod extending along the up and down direction is provided on the second connecting plate, the guide rod is slidably connected to the fixed plate in the up and down direction, the second cover plate is arranged below the second connecting plate, the dimensions of the fixed plate and the second connecting plate in the second direction are smaller than the dimensions of the slide rail in the second direction, and the first driver can move the first cover plate to be directly below the second cover plate.

[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.

[0025] The present invention also proposes a fuel cell monopolar plate airtightness detection method using the above-mentioned fuel cell monopolar plate airtightness detection device. The fuel cell monopolar plate airtightness detection method of the embodiment of the present invention comprises the following steps:

[0026] Using the first driving unit to drive at least one of the first cover plate and the second cover plate to move in the first direction, so that the second cover plate presses the electrode plate to be tested onto the first testing surface of the first cover plate, so that the electrode plate to be tested covers the opening of the testing groove on the first testing surface;

[0027] The fluid injection device introduces fluid into the detection cavity defined by the detection slot and the electrode plate to be detected through the first hole on the first cover plate, and makes the pressure in the detection cavity reach a first preset value;

[0028] The pressure in the detection cavity is monitored by a pressure detector, and after a second preset time, the air tightness of the electrode plate to be detected is determined according to the change value of the pressure in the detection cavity.

[0029] In some embodiments, the fluid injection device is an inflation device, and the inflation device introduces gas into the detection cavity through the first hole, so that the pressure in the detection cavity is greater than or equal to 100 kPa and less than or equal to 200 kPa;

[0030] The pressure detector is a gas pressure detector;

[0031] The second preset time is greater than or equal to 10 seconds and less than or equal to 30 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention.

[0033] Figure 2 4 is a front view of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention.

[0034] Figure 3 4 is a top view of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention.

[0035] Figure 4 Schematic diagram of a fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention.

[0036] Figure 5 It is a diagram of the use status of the fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1. first cover plate, 11. first detection surface, 12. detection groove, 13. sealing strip, 14. first channel, 15. cover plate positioning hole;

[0039] 2. The second cover plate;

[0040] 3. bottom plate, 31. slide rail, 32. first connecting plate, 33. first driver, 34. first stopper, 35. second stopper;

[0041] 4. a fixing plate, 41. a second connecting plate, 42. a second driver, 43. a supporting rod, 44. a guide rod;

[0042] 5. Plate, 51. Manifold port. DETAILED DESCRIPTION

[0043] 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.

[0044] The following describes the fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention 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 invention includes a first cover plate 1, a second cover plate 2, a first driving part, a fluid injection device and a pressure detector.

[0045] The first cover plate 1 has a first detection surface 11 , and a detection groove 12 is formed on the first detection surface 11 . The first cover plate 1 has a first hole 14 , and an outlet of the first hole 14 is connected to the detection groove 12 .

[0046] The thickness directions 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, and 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 electrode plate 5 to be detected on the first detection surface 11 and makes the electrode plate 5 to be detected cover the opening of the detection slot 12, so that the electrode 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 arranged at intervals. Specifically, the shape and size of the detection slot 12 are adapted to the part of the electrode plate 5 to be detected that needs to be detected, the part of the electrode plate 5 to be detected that covers the detection slot 12 is the part that needs to be detected, and when the electrode plate 5 to be detected covers the detection slot 12, the manifold port 51 and the air port of the electrode plate 5 to be detected are located outside the detection slot 12.

[0047] The first driving unit 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 unit can drive the second cover plate 2 and the first cover plate 1 to move from the release position to the detection position.

[0048] 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 slot 12. The pressure detector is used to detect the pressure in the detection cavity defined by the detection slot 12 and the electrode 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 electrode plate and the detection slot 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 electrode plate 5 to be detected has good air tightness. For example, the detection fluid is a gas.

[0049] Therefore, the fuel cell monopolar plate airtightness detection device according to the embodiment of the present invention has the advantage of being convenient for detecting the airtightness of the plate.

[0050] like Figures 1 to 5 As shown, in some embodiments, the thickness directions of the second cover plate 2 and the first cover plate 1 are both in the up-down direction. The first cover plate 1 is located at the lower side of the second cover plate 2, and the openings of the first detection surface 11 and the detection slot 12 are facing the upper side. The first driving unit can drive at least one of the first cover plate 1 and the second cover plate 2 to move in the up-down direction. Thus, when detection is required, it is convenient to place the electrode plate 5 to be detected directly on the first detection surface 11 of the first cover plate 1, and make the portion of the electrode plate 5 to be detected to cover the detection slot 12, and the manifold port 51 and the air port of the electrode plate 5 to be detected are located outside the detection slot 12. Then the first driving unit drives at least one of the first cover plate 1 and the second cover plate 2 to move in the up-down direction, so that the electrode plate 5 to be detected is completely pressed against the first cover plate 1, so that the detection slot 12 and the electrode plate 5 to be detected define a closed detection cavity. During the detection, if the closed detection cavity is not significantly reduced within a certain period of time, it means that the electrode plate 5 to be detected has good air tightness, that is, it means that the detection electrode plate 5 has good air tightness.

[0051] In some embodiments, a positioning portion is provided on the first cover plate 1, and the positioning portion is used to position the electrode plate 5 to be detected. Specifically, the first detection surface 11 has a plurality of cover plate positioning holes 15, and the number and position of the plurality of cover plate positioning holes 15 are adapted to the number and position of the plurality of electrode plate positioning holes on the electrode plate 5 to be detected. The first cover plate 1 positions the electrode plate 5 to be detected by means of pins penetrating through the electrode plate positioning holes and the cover plate positioning holes 15. Specifically, the pins are installed on the cover plate positioning holes 15, the electrode plate 5 to be detected is placed on the first cover plate 1, and the plurality of electrode plate positioning holes on the electrode plate 5 to be detected are aligned with the plurality of pins on the first detection surface 11, so that the positioning pins can be inserted into the electrode plate positioning holes to complete the positioning.

[0052] like Figures 1 to 5As shown, in some embodiments, the first detection surface 11 is a plane (horizontal plane), and an annular sealing strip 13 is provided on the first detection surface 11, and the sealing strip 13 and the first detection surface 11 define a detection groove 12. Specifically, the shape and size of the annular sealing strip 13 are adapted to the shape and size of the electrode plate 5 to be detected, so that the shape and size of the detection groove 12 are adapted to the part of the electrode plate 5 to be detected, and the electrode plate manifold port 51 and the air port of the electrode plate 5 to be detected positioned on the first detection surface 11 are located outside the detection groove 12 (sealing strip 13). This makes the detection more convenient, without blocking the electrode plate manifold port 51 and the air port, and makes the detection more stable. The sealing strip 13 is made of a flexible material and can be elastically deformed to ensure the sealing effect. For example, the sealing strip 13 is made of a rubber material. A sealing groove for installing the sealing strip 13 is provided on the first detection surface 11, and the shape of the sealing groove is adapted to the shape of the sealing strip 13, and the lower part of the sealing strip 13 is located in the sealing groove.

[0053] The outlet of the first hole 14 is provided on the first detection surface 11, and the outlet of the first hole 14 is located on the inner side of the sealing strip 13. Specifically, the inlet of the first hole 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 closed detection cavity defined by the detection groove 12 and the electrode plate 5 to be detected through the first hole 14. The detection head of the pressure detector can be arranged in the detection groove 12, the first hole 14 or the inflation device.

[0054] 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 up-down 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 the second direction, and the second direction is perpendicular to the up-down direction. Specifically, the second direction is a horizontal direction, so that after the electrode plate 5 to be detected 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 located 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 up-down direction, so that the second cover plate 2 presses the electrode plate 5 to be detected toward the first cover plate 1. The second direction can be a front-to-back direction, and the front-to-back direction is shown by the arrow 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.

[0055] like Figures 1 to 5 As shown, in some embodiments, the second driving unit includes a base plate 3 , a slide rail 31 , a first connecting plate 32 , and a first driver 33 .

[0056] The thickness direction of the bottom plate 3 is the up-down direction, the slide rail 31 is arranged on the upper surface of the bottom plate 3, and the slide rail 31 extends along the second direction. The thickness direction of the first connecting plate 32 is the up-down direction, the first connecting plate 32 is slidably arranged on the slide rail 31 along 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 arranged above the first connecting plate 32. Specifically, the first driver 33 includes a motor and a screw transmission device, and the motor can drive the first connecting plate 32 to move on the two slide rails 31 through the screw transmission device, thereby driving the first cover plate 1 to move in the second direction. For example, the slide rail 31 moves in the front-back direction, and the two slide rails 31 are arranged side by side in the left-right direction.

[0057] The first driving part includes a fixing plate 4 , a second connecting plate 41 and a second driver 42 .

[0058] The thickness direction of the fixed plate 4 is the up-down direction. The fixed plate 4 is located above the bottom plate 3 and is connected by a plurality of support rods 43. The second driver 42 is provided on the fixed plate 4 and has a drive shaft that can move in the up-down direction. The thickness direction of the second connecting plate 41 is the up-down direction. The second connecting plate 41 is located below the fixed plate 4 and is connected to the drive shaft of the second driver 42. The second connecting plate 41 is provided with (two) guide rods 44 extending in the up-down direction, and (two) guide rods 44 are connected to the fixed plate 4 in a sliding manner in the up-down direction. The second cover plate 2 is provided 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 the dimensions of the slide rail 31 in the second direction. The first driver 33 can move the first cover plate 1 to the right below the second cover plate 2. Specifically, the fixed plate 4 and the second connecting plate 41 are located on one side of the bottom plate 3 in the second direction. The second driver 42 is a cylinder and the fixed plate 4 is connected by four support rods 43. For example, the fixed plate 4 and the second connecting plate 41 are located at the front side of the bottom plate 3 in the front-back direction.

[0059] For example, after the electrode plate 5 to be detected 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 electrode plate 5 to be detected downward onto the first cover plate 1, so that the detection slot 12 and the electrode plate 5 to be detected define a closed detection cavity.

[0060] In some embodiments, the bottom plate 3 is provided with a first stopper 34 and a second stopper 35, and the first stopper 34 and the second stopper 35 are located on both sides 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, and the first stopper 34 and the second stopper 35 can limit the first connecting plate 32. For example, the first stopper 34 and the second stopper 35 are located on both sides of the first connecting plate 32 in the front-back direction.

[0061] The present invention also proposes a fuel cell monopolar plate airtightness detection method using the fuel cell monopolar plate airtightness detection device according to an embodiment of the present invention. The fuel cell monopolar plate airtightness detection method according to an embodiment of the present invention comprises the following steps:

[0062] The first driving unit is used to drive at least one of the first cover plate 1 and the second cover plate 2 to move in the first direction, so that the second cover plate 2 presses the electrode plate 5 to be detected onto the first detection surface 11 of the first cover plate 1, so that the electrode plate 5 to be detected covers the opening of the detection groove 12 on the first detection surface 11. For example, the second cover plate 2 presses the electrode plate 5 to be detected downward onto the first detection surface 11 of the first cover plate 1, so that the detection groove 12 and the electrode plate 5 to be detected define a closed detection cavity, and completes the sealing of the center position of the electrode plate except for the manifold port 51 of the electrode plate 5 to be detected, the gas port of the electrode plate 5 to be detected, and other opening areas.

[0063] The fluid injection device passes fluid into the detection cavity defined by the detection slot 12 and the electrode plate 5 to be detected 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 passes 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 to be 150 kPa.

[0064] The pressure in the detection chamber is monitored by a pressure detector. After a second preset time, the air tightness of the electrode plate 5 to be detected is determined according to the change in the pressure in the detection chamber. Specifically, the second preset time is greater than or equal to 10 seconds and less than or equal to 30 seconds. After 10 seconds (and within 30 seconds), if there is no (significant) change in the pressure in the detection chamber, it means that the air tightness of the monopolar plate is good.

[0065] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art 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, wherein the first cover plate has a first detection surface, the first detection surface has a detection groove, the first cover plate has a first hole, and an outlet of the first hole is connected to the detection groove; 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 opposite 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, the first cover plate and the second cover plate can move 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 makes the electrode plate to be detected cover the opening of the detection slot, and in which the first cover plate and the second cover plate are arranged at intervals; a first driving unit, wherein the first driving unit can drive 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 groove; A pressure detector is used to detect the pressure in the detection cavity defined by the detection groove and the electrode plate 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 in the up-down direction; The first cover plate is located at 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 hole is opened on the first detection surface, and the outlet of the first hole 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: The first cover plate is provided with a positioning portion, 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 positions the plate to be detected by means of 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 part 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-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-down direction.

7. The fuel cell monopolar plate airtightness detection device according to claim 6, characterized in that: The second driving part comprises 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 arranged on the upper surface of the bottom plate, 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 arranged 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 arranged above the first connecting plate; The first driving part includes a fixed plate, a second connecting plate and a second driver, the thickness direction of the fixed plate is the up and down direction, the fixed plate is located above the bottom plate, the fixed plate is connected by a plurality of support rods, the second driver is arranged on the fixed plate, the second driver has a driving shaft which can move in the up and down direction, the thickness direction of the second connecting plate is the up and down direction, the second connecting plate is located below the fixed plate, the second connecting plate is connected to the driving shaft of the second driver, a guide rod extending along the up and down direction is provided on the second connecting plate, the guide rod is slidably connected to the fixed plate in the up and down direction, the second cover plate is arranged below the second connecting plate, the dimensions of the fixed plate and the second connecting plate in the second direction are smaller than the dimensions of the slide rail in the second direction, and the first driver can move the first cover plate to be directly below the second cover plate.

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 at two sides of the first connecting plate in the second direction.

9. A method for detecting the gas tightness of a fuel cell monopolar plate using the fuel cell monopolar plate gas tightness detection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Using the first driving unit to drive at least one of the first cover plate and the second cover plate to move in the first direction, so that the second cover plate presses the electrode plate to be tested onto the first testing surface of the first cover plate, so that the electrode plate to be tested covers the opening of the testing groove on the first testing surface; The fluid injection device introduces fluid into the detection cavity defined by the detection slot and the electrode plate to be detected through the first hole on the first cover plate, and makes the pressure in the detection cavity reach a first preset value; The pressure in the detection cavity is monitored by a pressure detector, and after a second preset time, the air tightness of the electrode plate to be detected is determined according to the change value of the pressure in the detection cavity.

10. The method for detecting gas tightness of a fuel cell monopolar plate according to claim 9, characterized in that: The fluid injection device is an inflation device, and the inflation device introduces gas into the detection cavity through the first hole, so that the pressure in the detection cavity is greater than or equal to 100 kPa and less than or equal to 200 kPa; The pressure detector is a gas pressure detector; The second preset time is greater than or equal to 10 seconds and less than or equal to 30 seconds.

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