An airtightness testing device for ultrathin graphite bipolar plates

Abstract

The present invention relates to the technical field of bipolar plate detection, and more specifically discloses an airtight detection device for an ultra-thin graphite bipolar plate, comprising a support frame, the support frame comprising a base, a placement groove is provided on the top of the base, an ultra-thin graphite bipolar plate is placed on the top of the placement groove, a detection displacement groove and a detection cavity are provided at the bottom of the placement groove, a partition component is installed inside the detection displacement groove, a gear rod is installed on the side of the partition component, a displacement square groove is provided at the bottom of the side of the detection displacement groove, and a motor groove is provided inside the base; the present invention is provided with a down-pressing component and a partition component, so that the top of the ultra-thin graphite bipolar plate is inflated by using an air pump inside the down-pressing component, and a first air pressure and a second air pressure increased after the partition component is supported are used to realize fast and efficient positioning detection of air leakage, and at the same time, it is beneficial to protect the ultra-thin graphite bipolar plate and avoid high-pressure bending defects.

Description

Technical Field

[0001] The present invention relates to the technical field of bipolar plate detection, and more specifically to an airtight detection device for an ultra-thin graphite bipolar plate. Background Art

[0002] The bipolar plate is an important performance component in the fuel cell stack. It has flow channels on both sides to evenly distribute the reactants. It is responsible for distributing fuel and air to the two electrode surfaces and dissipating heat in the battery stack. Therefore, its airtightness is required to be high. Currently, the most commonly used material for bipolar plates is graphite. Graphite bipolar plates are generally prepared by mixing carbon powder or graphite powder with graphitizable resin. During the preparation process, defects may exist, which may cause the graphite bipolar plate matrix to have airtightness problems. If the airtightness is not good, it will have an adverse effect on the performance of the fuel cell.

[0003] The Chinese invention patent with publication number CN108281719A discloses a graphite bipolar plate air tightness detection device, including a lower bottom plate, an upper cover plate, an upper cover plate driving mechanism, an air supply mechanism and a U-shaped tube, wherein the lower bottom plate is fixedly arranged, and has a lower bottom plate cavity with an open top and an air inlet connected to the lower bottom plate cavity, the upper cover plate is arranged opposite to the lower bottom plate, and has an upper cover plate cavity with an open bottom and an air outlet connected to the upper cover plate cavity, the upper cover plate driving mechanism is connected to the upper cover plate in a transmission manner, and is used to drive the upper cover plate to move toward or away from the lower bottom plate, the air supply mechanism is connected to the lower bottom plate cavity through the air inlet, and the U-shaped tube is connected to the upper cover plate cavity through the air outlet. Compared with the prior art, the present invention has a simple structure, is easy to operate, has high reliability, and has wide adaptability. It can not only qualitatively measure the air tightness of the graphite plate, but also quantitatively measure the leakage amount.

[0004] It can be seen that at present, gas injection is usually used for leak detection of graphite bipolar plates. This detection method is highly efficient, but for ultra-thin graphite bipolar plates, in order to prevent the plates from deforming and causing damage during the detection process, the upper pressure is usually reduced to protect the bipolar plates. However, this adjustment will undoubtedly reduce the accuracy of air pressure detection, resulting in the inability to accurately and quickly judge air pressure changes, and the inability to achieve high-efficiency detection. At the same time, as the thickness of the graphite bipolar plate decreases, the difficulty of gas sealing increases, and the existing sealing structure cannot achieve a good automatic sealing effect in the case of misalignment. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an airtightness detection device for ultra-thin graphite bipolar plates to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical scheme: an airtight detection device for ultra-thin graphite bipolar plates, comprising a support frame, the support frame comprising a base, a placement groove is provided on the top of the base, an ultra-thin graphite bipolar plate is placed on the top of the placement groove, a detection displacement groove and a detection cavity are provided at the bottom of the placement groove, a partition assembly is installed inside the detection displacement groove, a gear rod is installed on the side of the partition assembly, a displacement square groove is provided at the bottom of the side of the detection displacement groove, a motor groove is provided inside the base, a transmission assembly is installed inside the motor groove, a horizontal movement groove is provided on the side of the detection cavity, a pneumatic assembly is installed inside the horizontal movement groove, the pneumatic assembly is meshed and connected with a laser assembly, positioning grooves are provided on the top of the base on both sides of the placement groove, a fixing plate is fixedly connected between the positioning grooves, a positioning assembly is installed on the top of the positioning groove, a pressing assembly is installed on the top of the positioning assembly, an air pump is installed inside the pressing assembly, and a direction adjustment assembly is installed inside the fixing plate;

[0007] Furthermore, the pneumatic assembly includes a first tooth plate, a front side of the first tooth plate is provided with a tooth groove, the tooth groove is meshed with the laser assembly, the back side of the first tooth plate is fixedly connected with a gas pressure plate and a sub-rod, a second spring is installed on the outer side of the sub-rod, the gas passes through the leakage point into the detection cavity, pushes the pneumatic assembly to move sideways, the first tooth plate drives the laser assembly to rotate, the light of the laser assembly changes position on the photosensitive plate, and the situation of the leakage point is judged by the movement of the light spot.

[0008] Furthermore, the positioning assembly includes multiple guide rods, the guide rods include thick and long rods and short and thin rods, a movable plate and a first spring are installed on the outer side of the short and thin rods, the first spring is installed on the bottom of the movable plate, and two double-toothed plates are installed inside the fixed plate. The two double-toothed plates are meshed with the adjustment assembly and are installed alternately, and the two double-toothed plates are hinged to the sides of the movable plate through connecting rods.

[0009] Furthermore, the partition assembly includes a movable outer frame, a plurality of partition chambers are opened inside the movable outer frame, a baffle and a displacement sensor are installed inside each partition chamber, an airbag groove is opened on the top of the movable outer frame around the partition chamber, an airbag is installed inside the airbag groove, control panels are fixedly connected on both sides of the movable outer frame, a threaded groove is opened on the control panel, the control panel is connected to the gear rod via the threaded groove, and the control panel is installed inside the displacement square groove.

[0010] Furthermore, the direction adjustment assembly includes a first fixing member, a second fixing member and a third fixing member, the first fixing member and the third fixing member are both installed on the second fixing member, the first fixing member and the second fixing member are connected by threads, and a thread groove is provided on the first fixing member.

[0011] Furthermore, the third fixing member includes a pressure plate and a connecting rod, the connecting rod is installed inside the second fixing member, and a third spring is installed inside the second fixing member on the side of the connecting rod, and a first gear is fixedly connected to the outer side of the first fixing member, and the first gear is installed on the fixing plate.

[0012] Furthermore, the transmission assembly includes a motor and a transmission rod, and a plurality of bevel gears are fixedly connected to the outer side of the transmission rod, and each bevel gear is meshingly connected to the gear rod. The gear rod includes a bevel gear and a threaded rod, and the threaded rod is installed inside the displacement square groove, and a control board is sleeved on the outer side. The bevel gears are meshingly connected to the transmission assembly, and the motor of the transmission assembly is connected to the photosensitive plate through electrical signals.

[0013] Furthermore, the detection displacement slot is provided with a pipeline on the side of the partition component, and the other end of the pipeline is connected to the detection cavity.

[0014] Furthermore, a photosensitive plate is installed on the back of the detection cavity, and an optical sensor is installed on the photosensitive plate. The optical sensor is used to collect the rays of the laser component.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention is provided with a pressing down assembly and a partition assembly, which is beneficial to inflating the top of the ultra-thin graphite bipolar plate by using the air pump inside the pressing down assembly, and utilizing the first air pressure and the second air pressure increased after the partition assembly supports to realize fast and efficient positioning detection of air leaks, and is also beneficial to protecting the ultra-thin graphite bipolar plate and avoiding high-pressure bending defects.

[0017] 2. The present invention is provided with a pneumatic component and a laser component, which facilitates the gas to push the pneumatic component to move sideways. Since the first tooth plate drives the laser component to rotate, the position of the light of the laser component changes on the photosensitive plate, and the gas leakage situation can be magnified and judged through the deflection angle of the light, which is conducive to high-precision detection of leakage.

[0018] 3. The present invention is provided with a direction adjustment component, which is beneficial to utilizing the first fixing member to rotate inside the second fixing member, driving the second fixing member to move toward the third fixing member, and pushing the pressure plate of the third fixing member to clamp the ultra-thin graphite bipolar plate. At the same time, the third spring is used to achieve positioning adjustment of the ultra-thin graphite bipolar plate while avoiding damage to the ultra-thin graphite bipolar plate due to excessive force, thereby achieving a protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the overall structural assembly of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the pneumatic component of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the positioning component of the present invention.

[0024] Figure 6 It is a schematic diagram of the support frame structure of the present invention.

[0025] Figure 7 It is a schematic diagram of the structure of the partition assembly of the present invention.

[0026] Figure 8 It is a schematic diagram of the structure of the direction adjustment component of the present invention.

[0027] Fig. 9 It is a flow chart of the air tightness detection process of the present invention.

[0028] The accompanying drawings are marked as follows: 1. support frame; 101. base; 102. placement slot; 103. detection displacement slot; 104. detection chamber; 105. displacement square slot; 106. motor slot; 107. horizontal movement slot; 108. positioning slot; 109. fixing plate; 2. pressing assembly; 3. positioning assembly; 301. guide rod; 302. moving plate; 303. first spring; 304. double tooth plate; 4. ultra-thin graphite bipolar plate; 5. partition assembly; 501. displacement Moving outer frame; 502, control board; 503, partition chamber; 504, airbag slot; 6, photosensitive plate; 7, transmission assembly; 8, pneumatic assembly; 801, first gear plate; 802, auxiliary rod; 803, second spring; 804, gas pressure plate; 9, laser assembly; 10, gear rod; 11, direction adjustment assembly; 1101, first fixing member; 1102, second fixing member; 1103, third fixing member; 1104, third spring; 1105, first gear. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The airtightness detection equipment for an ultra-thin graphite bipolar plate involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] Reference Figure 1 - Figure 3The present invention provides an airtight detection device for an ultra-thin graphite bipolar plate, comprising a support frame 1, the support frame 1 comprising a base 101, a placement groove 102 is provided on the top of the base 101, an ultra-thin graphite bipolar plate 4 is placed on the top of the placement groove 102, a detection displacement groove 103 and a detection cavity 104 are provided at the bottom of the placement groove 102, a partition component 5 is installed inside the detection displacement groove 103, a gear rod 10 is installed on the side of the partition component 5, a displacement square groove 105 is provided at the bottom of the side of the detection displacement groove 103, a motor groove 106 is provided inside the base 101, and a motor groove 106 is provided inside the base 101. A transmission component 7 is installed inside the machine slot 106, a horizontal moving slot 107 is opened on the side of the detection cavity 104, a pneumatic component 8 is installed inside the horizontal moving slot 107, the pneumatic component 8 is meshed and connected with the laser component 9, and positioning slots 108 are opened on both sides of the placement slot 102 at the top of the base 101, and a fixing plate 109 is fixedly connected between the positioning slots 108, a positioning component 3 is installed on the top of the positioning slot 108, a downward pressure component 2 is installed on the top of the positioning component 3, an air pump is installed inside the downward pressure component 2, and an adjustment component 11 is installed inside the fixing plate 109.

[0031] In the present embodiment, it is necessary to specifically explain that: a pipeline is provided on the side of the detection displacement groove 103 located at the partition component 5, and the other end of the pipeline is connected to the detection cavity 104. If there is a gas leakage in the ultra-thin graphite bipolar plate 4, the air pressure at the top of the ultra-thin graphite bipolar plate 4 increases, and the gas passes through the leakage point and enters the bottom of the ultra-thin graphite bipolar plate 4, and enters the detection cavity 104 at the side pipeline of the detection displacement groove 103 between the ultra-thin graphite bipolar plate 4 and the partition component 5, pushing the air pressure component 8 to move sideways.

[0032] A photosensitive plate 6 is installed on the back of the detection cavity 104. The photosensitive plate 6 is used to collect the rays of the laser component 9 and judge the leakage point by the movement of the light spot. An optical sensor is installed on the photosensitive plate 6. The installation and use methods of the sensor belong to the prior art and will not be elaborated in detail in this application.

[0033] The main difference between this embodiment and the prior art is that in this embodiment, the leakage gas change is converted into an optical angle change to achieve a more accurate and effective detection effect, reduce the detection difficulty and misjudgment of the ultra-thin graphite bipolar plate, and reduce the detection pressure value. Multiple ventilations at different pressures and increased isolation means are used to achieve detection protection of the bipolar plate while positioning, and avoid bending and deformation of the ultra-thin graphite bipolar plate 4 in a high-pressure environment, resulting in product defects, specifically in the partition component 5, the photosensitive plate 6, the air pressure component 8, and the laser component 9;

[0034] The above structure is the main structure of this embodiment, which solves the problem that ultra-thin graphite bipolar plates are prone to product defects during high-pressure environment testing. The sensor is an existing structure, and this embodiment does not describe in detail the specific structure and connection method of the sensor.

[0035] Reference Figure 2 The transmission assembly 7 includes a motor and a transmission rod. A plurality of bevel gears are fixedly connected to the outer side of the transmission rod. Each bevel gear is meshed with the gear rod 10. The gear rod 10 includes a bevel gear and a threaded rod. The threaded rod is installed inside the displacement square groove 105. A control board 502 is sleeved on the outer side. The bevel gears are meshed with the transmission assembly 7.

[0036] In this embodiment, it is necessary to specifically explain that: the motor of the transmission component 7 is connected to the photosensitive plate 6 through an electrical signal. When the photosensitive plate 6 determines that there is a leak, the electrical signal controls the transmission component 7 to start a separate positioning detection. When the photosensitive plate 6 determines that there is no leak, the detection is ended and the transmission component 7 does not work. This is beneficial to using a graded detection method to reduce the detection process and improve detection efficiency.

[0037] Reference Figure 4 The pneumatic assembly 8 includes a first tooth plate 801, a tooth groove is provided on the front side of the first tooth plate 801, and the tooth groove is meshed with the laser assembly 9. The back side of the first tooth plate 801 is fixedly connected with a gas pressure plate 804 and a sub-rod 802, and a second spring 803 is installed on the outer side of the sub-rod 802. If there is a gas leakage in the ultra-thin graphite bipolar plate 4, due to the high air pressure at the top, the gas passes through the leakage point and enters the bottom of the ultra-thin graphite bipolar plate 4, and enters the detection cavity 104 at the side pipe of the detection displacement groove 103 between the ultra-thin graphite bipolar plate 4 and the partition assembly 5. At this time, the internal air pressure of the detection cavity 104 increases, and the gas pushes the pneumatic assembly 8 to move sideways. The first tooth plate 801 drives the laser assembly 9 to rotate, and the light of the laser assembly 9 changes position on the photosensitive plate 6.

[0038] In this embodiment, it should be specifically explained that: since the angle change is more accurate and sensitive than the existing liquid level detection, it can be better applied to the detection process of ultra-thin graphite bipolar plates, and a lower gas pressure can still achieve better detection results.

[0039] Reference Figure 5The positioning assembly 3 includes a plurality of guide rods 301, and the guide rods 301 include a thick and long rod and a short and thin rod. A movable plate 302 and a first spring 303 are installed on the outer side of the short and thin rod. The first spring 303 is installed at the bottom of the movable plate 302. Two double-tooth plates 304 are installed inside the fixed plate 109. The two double-tooth plates 304 are meshed with the adjustment assembly 11 and are installed alternately. The two double-tooth plates 304 are respectively hinged on the sides of the movable plate 302 through connecting rods. When the movable plate 302 moves downward, the double-tooth plates 304 drive the adjustment assembly 11 to rotate, and the first spring 303 makes the movable plate 302 always have an upward movement trend.

[0040] In this embodiment, it is necessary to specifically explain that: during the descent of the pressing assembly 2, since the side of the pressing assembly 2 is installed on the guide rod 301, the pressing assembly 2 pushes the movable plate 302 to move downward, and the movement of the movable plate 302 drives the double-toothed plate 304 to move toward the middle. Since the double-toothed plate 304 is provided with tooth grooves, when the two double-toothed plates 304 move toward the middle in an alternating manner, the direction adjustment assembly 11 is driven to rotate.

[0041] Reference Figure 7 The partition assembly 5 includes a movable outer frame 501, a plurality of partition chambers 503 are provided inside the movable outer frame 501, a baffle and a displacement sensor are installed inside each partition chamber 503, an airbag groove 504 is provided around the top of the movable outer frame 501, an airbag is installed inside the airbag groove 504, a control board 502 is fixedly connected to both sides of the movable outer frame 501, a thread groove is provided on the control board 502, the control board 502 is connected to the gear rod 10 through the thread groove, and the control board 502 is installed inside the displacement square groove 105 to move up and down. When the transmission assembly 7 is started, the transmission assembly 7 The motor drives the transmission rod to rotate, and the bevel gear on the transmission rod drives the gear rod 10 to rotate. Since the outer side of the gear rod 10 is provided with a spiral groove and is installed on the control board 502, the rotation of the gear rod 10 drives the partition assembly 5 to move upward. After the movement is completed, the airbags at the airbag grooves 504 separate the bottom of the ultra-thin graphite bipolar plate 4 to form a plurality of sealed chambers. At the same time, the blocking of the side pipes of the detection displacement grooves 103 prevents the gas at the bottom of the ultra-thin graphite bipolar plate 4 from escaping, and the air pressure is increased again to change the air pressure in the small sealed chamber. The positioning detection work is completed by detecting the air pressure of the small sealed chamber.

[0042] In the present embodiment, it is necessary to specifically explain that: after movement, the airbag inside the airbag groove 504 contacts the bottom of the ultra-thin graphite bipolar plate 4 to achieve isolation and at the same time supports the bottom of the ultra-thin graphite bipolar plate 4. The airbag plays the role of a bottom reinforcement rib, which makes it possible for the ultra-thin graphite bipolar plate 4 to still not bend and deform under high pressure when the air pressure is increased on the top of the ultra-thin graphite bipolar plate 4. The adaptable pressure changes are greater and the detection and positioning are more accurate.

[0043] Reference Figure 8 The direction adjustment component 11 includes a first fixing member 1101, a second fixing member 1102 and a third fixing member 1103. The first fixing member 1101 and the third fixing member 1103 are both mounted on the second fixing member 1102. The first fixing member 1101 and the second fixing member 1102 are connected by threads. A thread groove is provided on the first fixing member 1101. The third fixing member 1103 includes a pressing plate and a connecting rod. The connecting rod is mounted inside the second fixing member 1102. A third spring 1104 is installed inside the second fixing member 1102 on the side of the connecting rod. A first gear 1105 is fixedly connected to the outside of the first fixing member 1101. The first gear 1105 is mounted on the fixing member 1102. On the fixed plate 109, when the adjustment component 11 rotates, the rotation of the adjustment component 11 causes the threaded groove of the first fixing member 1101 to rotate inside the second fixing member 1102, driving the second fixing member 1102 to move toward the third fixing member 1103, pushing the pressure plate of the third fixing member 1103 to clamp the ultra-thin graphite bipolar plate 4. After the pressure plate contacts the ultra-thin graphite bipolar plate 4, the ultra-thin graphite bipolar plate 4 applies a reaction force to the pressure plate. At this time, the third fixing member 1103 compresses the third spring 1104 inside the second fixing member 1102, thereby achieving the positioning adjustment of the ultra-thin graphite bipolar plate 4 while avoiding damage to the ultra-thin graphite bipolar plate 4 due to excessive force, thereby achieving a protective effect.

[0044] In this embodiment, it should be specifically explained that the clamping effect of the adjustment component 11 enables the ultra-thin graphite bipolar plate 4 to maintain the same position characteristics during each detection, so that after the bottom of the down-pressing component 2 descends, it can form a stable sealed cavity with the upper surface of the ultra-thin graphite bipolar plate 4, thereby avoiding leakage from the side of the bipolar plate after inflation.

[0045] The main problem solved by this embodiment is: to achieve more accurate and effective detection effect by converting the change of leaked gas into the change of optical angle, reduce the detection difficulty and misjudgment of ultra-thin graphite bipolar plates, and at the same time reduce the detection pressure value, adopt multiple ventilations with different pressures and increase isolation means to realize the detection protection of bipolar plates while positioning, and avoid the ultra-thin graphite bipolar plates 4 from bending and deforming in a high-pressure environment, resulting in product defects.

[0046] A method for detecting the air tightness of an ultra-thin graphite bipolar plate, the specific steps are as follows:

[0047] Step 1: during the placement process, the ultra-thin graphite bipolar plate 4 is placed inside the placement groove 102, and the pressing assembly 2 is started to move downward to seal the top of the ultra-thin graphite bipolar plate 4. During the descent of the pressing assembly 2, since the side of the pressing assembly 2 is installed on the guide rod 301, the pressing assembly 2 pushes the moving plate 302 to move downward, and the movement of the moving plate 302 drives the double tooth plate 304 to move toward the middle. Since the double tooth plate 304 is provided with tooth grooves, when the two double tooth plates 304 move toward the middle in an interlaced manner, the direction adjustment assembly 11 is driven to rotate;

[0048] Step 2: During the clamping process, the rotation of the adjustment component 11 causes the thread groove of the first fixing member 1101 to rotate inside the second fixing member 1102, driving the second fixing member 1102 to move toward the third fixing member 1103, pushing the pressure plate of the third fixing member 1103 to clamp the ultra-thin graphite bipolar plate 4. After the pressure plate contacts the ultra-thin graphite bipolar plate 4, the ultra-thin graphite bipolar plate 4 applies a reaction force to the pressure plate. At this time, the third fixing member 1103 compresses the third spring 1104 inside the second fixing member 1102, thereby achieving positioning and adjustment of the ultra-thin graphite bipolar plate 4 while avoiding damage to the ultra-thin graphite bipolar plate 4 due to excessive force, thereby achieving a protective effect;

[0049] Step 3: Detection process, after completing the clamping, start the air pump inside the down-pressing component 2 to inflate the top of the ultra-thin graphite bipolar plate 4. At this time, the air pressure is the first air pressure. Wait for three seconds. If there is no leakage in the ultra-thin graphite bipolar plate 4, the air pressure component 8 and the laser component 9 are not in action. At this time, it is judged that there is no leakage through the fixed light spot at the photosensitive plate 6, and the detection is completed. If there is leakage in the ultra-thin graphite bipolar plate 4, due to the high air pressure at the top, the gas passes through the leakage point and enters the bottom of the ultra-thin graphite bipolar plate 4, and enters the detection cavity 104 at the side pipe of the detection displacement groove 103 between the ultra-thin graphite bipolar plate 4 and the partition component 5. At this time, the internal air pressure of the detection cavity 104 increases, and the gas pushes the air pressure component 8 to move sideways. Since the tooth grooves on the first tooth plate 801 are meshed and connected with the laser component 9, the tooth grooves drive the laser component 9 to rotate, and the light of the laser component 9 changes position on the photosensitive plate 6, so as to realize the amplified judgment of the gas leakage through the deflection angle and speed of the light;

[0050] Step 4: Positioning preparation process, after confirming that there is a leakage, start the transmission component 7, the motor of the transmission component 7 drives the transmission rod to rotate, and the bevel gear on the transmission rod drives the gear rod 10 to rotate. Since the outer side of the gear rod 10 is provided with a spiral groove and is installed on the control board 502, the rotation of the gear rod 10 drives the partition component 5 to move upward. After the movement, the outer frame 501 is moved to block the pipeline on the side of the detection displacement groove 103, and the gas cannot enter the inside of the detection cavity 104 from the pipeline again. The airbag inside the airbag groove 504 contacts the bottom of the ultra-thin graphite bipolar plate 4 to achieve isolation, and at the same time, support ribs are added to the bottom of the ultra-thin graphite bipolar plate 4;

[0051] Step 5: Positioning process, start the air pump of the downward pressure component 2 to increase the top pressure of the ultra-thin graphite bipolar plate 4. At this time, the air pressure is the second air pressure, and the second air pressure is greater than the first air pressure. Since the bottom of the ultra-thin graphite bipolar plate 4 has the auxiliary support function of the airbag at this time, the increase in pressure at this time will not cause the ultra-thin graphite bipolar plate 4 to bend and cause deformation. As the pressure on the top of the ultra-thin graphite bipolar plate 4 increases, the gas enters the interior of the separation chamber 503 from the leakage point, pushing the baffle inside the separation chamber 503 to move downward, and the displacement sensor detects the position change of the point, outputs the position of the leakage point, and completes the positioning process. The operator adjusts and upgrades the processing technology and production process according to the change of the leakage point on the ultra-thin graphite bipolar plate 4.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An airtightness detection device for ultra-thin graphite bipolar plates, comprising a support frame (1), characterized in that: The support frame (1) comprises a base (101), a placement groove (102) is provided on the top of the base (101), an ultra-thin graphite bipolar plate (4) is placed on the top of the placement groove (102), a detection displacement groove (103) and a detection cavity (104) are provided on the bottom of the placement groove (102), a partition assembly (5) is installed inside the detection displacement groove (103), a gear rod (10) is installed on the side of the partition assembly (5), a displacement square groove (105) is provided on the bottom of the side of the detection displacement groove (103), a motor groove (106) is provided inside the base (101), and a transmission assembly (104) is installed inside the motor groove (106) 7), a horizontal moving groove (107) is provided on the side of the detection cavity (104), a pneumatic assembly (8) is installed inside the horizontal moving groove (107), the pneumatic assembly (8) is meshedly connected with the laser assembly (9), a top of the base (101) is provided with positioning grooves (108) on both sides of the placement groove (102), a fixing plate (109) is fixedly connected between the positioning grooves (108), a positioning assembly (3) is installed on the top of the positioning groove (108), a downward pressing assembly (2) is installed on the top of the positioning assembly (3), an air pump is installed inside the downward pressing assembly (2), and a direction adjustment assembly (11) is installed inside the fixing plate (109); The pneumatic assembly (8) comprises a first tooth plate (801), a tooth groove is formed on the front of the first tooth plate (801), and the tooth groove is meshed with the laser assembly (9). A gas pressure plate (804) and a sub-rod (802) are fixedly connected on the back of the first tooth plate (801), and a second spring (803) is installed on the outer side of the sub-rod (802). The gas passes through the leakage point and enters the detection cavity (104), pushing the pneumatic assembly (8) to move sideways. The first tooth plate (801) drives the laser assembly (9) to rotate, and the position of the light of the laser assembly (9) changes on the photosensitive plate (6). The situation of the leakage point is judged by the movement of the light spot. The positioning assembly (3) comprises a plurality of guide rods (301), the guide rods (301) comprising a thick and long rod and a short and thin rod, a movable plate (302) and a first spring (303) are mounted on the outer side of the short and thin rod, the first spring (303) is mounted on the bottom of the movable plate (302), two double-tooth plates (304) are mounted inside the fixed plate (109), the two double-tooth plates (304) are meshed with the direction adjustment assembly (11) and are staggeredly mounted, and the two double-tooth plates (304) are respectively hinged to the side of the movable plate (302) through a connecting rod; The partition assembly (5) comprises a movable outer frame (501), a plurality of partition chambers (503) are provided inside the movable outer frame (501), a baffle and a displacement sensor are installed inside each partition chamber (503), an airbag groove (504) is provided on the top of the movable outer frame (501) and around the partition chamber (503), and an airbag is installed inside the airbag groove (504); The direction adjustment component (11) comprises a first fixing member (1101), a second fixing member (1102) and a third fixing member (1103); the first fixing member (1101) and the third fixing member (1103) are both mounted on the second fixing member (1102); the first fixing member (1101) and the second fixing member (1102) are connected via threads; and a thread groove is provided on the first fixing member (1101); The transmission assembly (7) comprises a motor and a transmission rod, a plurality of bevel gears are fixedly connected to the outer side of the transmission rod, each bevel gear is meshedly connected to the gear rod (10), the gear rod (10) comprises a bevel gear and a threaded rod, the threaded rod is installed inside the displacement square groove (105), a control board (502) is sleeved on the outer side, the bevel gears are meshedly connected to the transmission assembly (7), and the motor of the transmission assembly (7) is connected to the photosensitive plate (6) via an electrical signal; A photosensitive plate (6) is mounted on the back of the detection cavity (104), and an optical sensor is mounted on the photosensitive plate (6), the optical sensor being used to collect radiation from the laser component (9).

2. The airtightness detection device for ultra-thin graphite bipolar plates according to claim 1, characterized in that: A control board (502) is fixedly connected to both sides of the movable outer frame (501), a thread groove is provided on the control board (502), the control board (502) is connected to the gear rod (10) via the thread groove, and the control board (502) is installed inside the displacement square groove (105).

3. The airtightness detection device for ultra-thin graphite bipolar plates according to claim 1, characterized in that: The third fixing member (1103) comprises a pressure plate and a connecting rod, the connecting rod is installed inside the second fixing member (1102), and a third spring (1104) is installed inside the second fixing member (1102) on the side of the connecting rod, and a first gear (1105) is fixedly connected to the outer side of the first fixing member (1101), and the first gear (1105) is installed on the fixing plate (109).

4. The airtightness detection device for ultra-thin graphite bipolar plates according to claim 1, characterized in that: The detection displacement groove (103) is located on the side of the partition component (5) and is provided with a pipeline, and the other end of the pipeline is connected to the detection cavity (104).

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