Galvanic pile airtightness detection device
By designing a stack airtight detection device suitable for stacks of different specifications, the problem that traditional tooling cannot adapt to stacks of different specifications is solved, and the effect of improving the stack airtight detection efficiency and accuracy is achieved.
Patent Information
- Application Number
- CN202421208135.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-05-29
AI Technical Summary
Traditional fixed-size tooling cannot adapt to different specifications of stacks, resulting in inefficient detection of stack airtightness.
A pile airtight detection device is designed, including a workbench, a fixing mechanism, a clamping mechanism and an airtight detection mechanism. The device can adapt to different specifications of stacks by providing adjustable movable plates and multi-point fixing mechanisms on the workbench, and achieve fast and accurate detection through clamping mechanisms and airtight detection mechanisms.
The device can quickly fix stacks of different sizes, reduce the time to replace tooling, and improve the efficiency and accuracy of stack airtightness detection.
Smart Images
Figure CN222514441U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to battery production technology, and in particular to a battery stack air tightness detection device. Background Art
[0002] In the context of the rapid development of new energy technologies, the performance and reliability of the fuel cell stack, as the core component of the fuel cell system, directly affect the energy conversion efficiency and the stable operation of the equipment. The fuel cell stack is composed of multiple single cells stacked in series. Each single cell contains a bipolar plate and a membrane electrode assembly. Seals are embedded between each single cell to prevent gas leakage and ensure effective isolation of the electrochemical reaction.
[0003] In the early R&D and trial production of the fuel cell stack, as well as the production and packaging stage, leak detection and repair has become a difficult challenge. The sealing verification of the fuel cell stack structure requires uniform pressure during the test process to ensure that the leakage rate is minimized and the leak point is accurately located. However, the current fixed-size tooling cannot meet the applicability requirements of fuel cells of various specifications, resulting in a long time and low efficiency of tooling during testing, which reduces the efficiency of fuel cell stack airtightness testing. Utility Model Content
[0004] A technical problem to be solved by the present disclosure is that when performing air tightness testing on a fuel cell stack, for fuel cell stacks of different specifications, traditional fixed-size tooling cannot meet the applicability requirements of tooling for fuel cell stacks of different specifications, thereby resulting in reduced testing efficiency.
[0005] To solve the above technical problems, an embodiment of the present disclosure provides an airtightness detection device for a battery stack, comprising a workbench, the workbench is provided with a receiving surface, the receiving surface is provided with a groove for placing the battery stack, at least one side wall of the groove is provided with a fixing mechanism capable of fixing the battery stack from the side of the battery stack; a clamping mechanism, the clamping mechanism is located on the workbench and above the receiving surface, so that the clamping mechanism can clamp the end of the battery stack away from the receiving surface; an airtightness detection mechanism, for detecting whether there is a leak in the battery stack after the battery stack is fixed by the fixing mechanism and clamped by the clamping mechanism.
[0006] In some embodiments, the fixing mechanism includes a mounting hole disposed on a side wall of the groove, a movable plate installed in the mounting hole, and a fixing member for abutting the movable plate against the battery stack in the groove.
[0007] In some embodiments, the movable plate is an L-shaped plate.
[0008] In some embodiments, the fixing member includes a plurality of fixing plates located outside the mounting hole and fixing pins located on the fixing plates, and the fixing pins pass through the fixing plates and are connected to the movable plates.
[0009] In some embodiments, the fixing pin includes a shaft portion and a holding portion, one end of the shaft portion abuts against the movable plate, and the other end is connected to the holding portion, and the holding portion is located outside the fixing plate for limiting the travel of the shaft portion.
[0010] In some embodiments, the plurality of fixing plates are evenly arranged along the length direction of the mounting hole.
[0011] In some embodiments, the clamping mechanism includes a sleeve that can be sleeved on the end of the battery stack away from the receiving surface, a plurality of clamping members installed on the sleeve, and a tightener. The tightener can clamp the sleeve to the end of the battery stack away from the receiving surface by screwing the clamping members.
[0012] In some embodiments, the tightener is mounted on a workbench and is located above the receiving surface.
[0013] In some embodiments, a plurality of clamping members are evenly arranged on the sleeve, and the tighteners are disposed in one-to-one correspondence with the clamping members.
[0014] In some embodiments, the airtight detection mechanism includes a distribution manifold installed on the sleeve, one end of the distribution manifold is connected to each air inlet of the fuel cell stack, and the other end is provided with a connector for connecting to the air supply device.
[0015] Through the above technical scheme, the present invention provides a fuel cell stack airtightness detection device, a workbench is provided with a receiving surface, the receiving surface is provided with a groove for placing the fuel cell stack, the fuel cell stack is turned over into the groove, at least one side wall of the groove is provided with a fixing mechanism capable of fixing the fuel cell stack from the side of the fuel cell stack, a clamping mechanism is provided on the workbench and above the receiving surface, the end of the fuel cell stack away from the receiving surface is clamped, and the airtightness detection mechanism injects non-colored gas into the air inlet of the fuel cell stack to detect whether there is a leak in the fuel cell stack, and the fuel cell stack airtightness detection device can be used for tooling of fuel cell stacks of different specifications, reducing the time required for the tooling process, which is conducive to improving the airtightness detection efficiency of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 It is a structural schematic diagram of a fuel cell stack gas tightness detection device disclosed in an embodiment of the present disclosure;
[0018] Figure 2 is a schematic diagram of the structure of a workbench disclosed in an embodiment of the present disclosure;
[0019] Figure 3is a schematic structural diagram of a pressing member disclosed in an embodiment of the present disclosure;
[0020] Figure 4 It is a schematic diagram of the structure of the movable plate disclosed in the embodiment of the present disclosure.
[0021] Description of reference numerals:
[0022] 1. Tightener; 2. Connector; 3. Battery stack; 4. Clamping piece; 5. Movable plate; 6. Fixing pin; 7. Workbench; 8. Distribution manifold; 9. Mounting hole; 10. Supporting surface; 12. Fixing plate; 13. Groove; 14. Socket. DETAILED DESCRIPTION
[0023] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
[0024] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.
[0025] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure 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 cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0026] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.
[0027] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.
[0028] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.
[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0030] The present invention provides a gas tightness detection device for a fuel cell stack, see Figure 1 , including a workbench 7, a clamping mechanism and an airtight detection mechanism. The workbench 7 is provided with a receiving surface 10, and a groove 13 for placing the battery stack 3 is provided on the receiving surface 10. At least one side wall of the groove 13 is provided with a fixing mechanism capable of fixing the battery stack from the side of the battery stack 3. The clamping mechanism is located on the workbench 7 and above the receiving surface 10, so that the clamping mechanism can clamp the end of the battery stack 3 away from the receiving surface 10. The airtight detection mechanism is used to detect whether there is a leak in the battery stack 3 after the battery stack 3 is fixed by the fixing mechanism and clamped by the clamping mechanism. The battery stack 3 is placed in the groove 13, and the fixing mechanism fixes one end of the battery stack 3 and the other end is fixed by the clamping mechanism. The airtight detection mechanism injects non-colored gas into the air inlet of the battery stack to detect whether there is a leak in the battery stack. The battery stack airtight detection device is universal and convenient, can quickly fix battery stacks 3 of different sizes, and reduce the time for re-customizing tooling due to replacement of the battery stack 3, which is conducive to improving the airtightness detection efficiency of the battery stack.
[0031] In some embodiments, see Figure 2The fixing mechanism includes a mounting hole 9 arranged on the side wall of the groove 13, a movable plate 5 installed in the mounting hole 9, and a fixing part for abutting the movable plate 5 against the battery stack 3 in the groove 13. The mounting hole 9 can be used in conjunction with the movable plate 5 to accurately limit the movement range and trajectory of the movable plate 5, ensuring that the movable plate 5 moves on a predetermined path. At the same time, the movable plate 5 is supported by the mounting hole 9 to prevent it from being deformed. The movable plate 5 abuts against the battery stack 3 and is locked by the fixing part, effectively preventing the displacement of the battery stack 3 during the detection process. The use of the adjustable movable plate 5 to clamp the battery stack 3 facilitates the installation and disassembly of the battery stack 3 and enables the workbench 7 to clamp battery stacks 3 of different specifications.
[0032] In the embodiment of the utility model, the groove 13 can be provided with a fixing mechanism on one side wall, or on any two or three side walls, or on each side wall. When fixing mechanisms are provided on multiple side walls of the groove 13, a multiple insurance mechanism is formed. Even if one of the fixing mechanisms fails or becomes loose, the other fixing mechanisms can still maintain the stable installation of the battery stack 3, reducing the risk of system failure and improving the reliability of the equipment. When repairing or replacing parts, the same fixing mechanism is convenient for technicians to maintain and shorten downtime.
[0033] In some embodiments, see Figure 4 and Figure 1 , the movable plate 5 is an L-shaped plate used to increase the contact area with the battery stack 3. It should be noted that the cross section of the L-shaped plate presents the letter "L", and is composed of two mutually perpendicular or substantially perpendicular parts, the longer part at one end is used to contact the battery stack 3, and the shorter vertical part at the other end is installed in the mounting hole 9. The L-shaped plate provides a larger contact area when in contact with the battery stack 3, so that the pressure on the battery stack 3 can be more evenly distributed, preventing local concentration of stress and protecting the battery stack 3 from damage caused by uneven pressure. In addition, the L-shaped plate can quickly transfer the heat of the battery stack 3 from the battery stack 3, which helps to improve the heat exchange efficiency between the battery stack 3 and the outside.
[0034] In some embodiments, see Figure 1 and Figure 2 The fixing parts include a plurality of fixing plates 12 located outside the mounting hole 9 and a fixing pin 6 located on the fixing plate 12; for example: tightening bolts, knobs, etc.; the fixing pin 6 passes through the fixing plate 12 and is connected to the movable plate 5, and adopts multi-point fixation. Through the joint action of the plurality of fixing plates 12 and the fixing pin 6, the force can be evenly distributed, the firmness of the connection can be enhanced, and at the same time, the clamping force provided by the movable plate 5 to the battery stack 3 is more balanced.
[0035] In some embodiments, see Figure 1The fixing pin 6 includes a shaft and a holding portion, one end of the shaft is connected to the movable plate 5, and the other end is connected to the holding portion, and the holding portion is located on the outside of the fixing plate 12 to limit the stroke of the shaft, so that the fixing pin 6 can adjust the stroke of the movable plate 5. By selecting fixing plates 12 of different sizes to change the distance between the fixing plate 12 and the workbench 7 or adjusting the length of the shaft of the fixing pin 6, it is beneficial to adjust the relative position of the movable plate 5 and the battery stack 3 to adapt to different tooling requirements and improve the versatility and adaptability of the workbench 7.
[0036] In some embodiments, see Figure 1 and Figure 2 , multiple fixing plates 12 are evenly arranged along the length direction of the mounting hole 9, each fixing plate 12 is an independent supporting point, and multiple fixing plates 12 work together. Even if a fixing plate 12 is loose or fails, other fixing plates 12 can continue to provide necessary support, thereby enhancing the system's fault tolerance to failure of the fixing plates 12 and improving the overall reliability.
[0037] In addition, for the heterogeneous battery stack 3, when the contact surface between the battery stack 3 and the movable plate 5 is non-planar, the movable plate 5 is divided into several movable plates, each of which can move independently, and the community formed by them is the movable plate 5, which increases the adaptability of the fixing mechanism.
[0038] In some embodiments, see Figure 1 The clamping mechanism includes a sleeve 14 that can be sleeved on the end of the battery stack 3 away from the receiving surface 10, a plurality of clamping members 4 installed on the sleeve 14, and a tightener 1. The tightener 1 can make the sleeve 14 clamp the end of the battery stack 3 away from the receiving surface 10 by screwing the clamping member 4. Through the coordinated work of the sleeve 14, the clamping member 4 and the tightener 1, the end of the battery stack 3 composed of multiple plates away from the groove 13 is accurately and precisely clamped. Through the fine adjustment of the clamping member 4 by the tightener 1, the clamping force is accurately controlled. For battery stacks 3 with different sizes, weights or clamping requirements, the best fixing effect is ensured. When disassembling, it is only necessary to use the tightener 1 to reverse the operation to loosen the clamping member 4. No complicated tools or a lot of manpower are required, which improves work efficiency.
[0039] In some embodiments, the tightener 1 is installed on the workbench 7 and is located above the receiving surface 10, so that the tightener 1 can control the clamping member 4 to clamp or loosen the battery stack 3, which is beneficial to improving work efficiency.
[0040] In some embodiments, see Figure 1 and Figure 3, multiple clamps 4 are evenly arranged on the sleeve 14, and the tightener 1 is set one by one with the clamping piece 4. The uniform distribution of the clamping piece 4 ensures that the clamping force can be evenly transmitted along the contact surface of the battery stack 3, avoiding local over-tightening or over-loosening, reducing deformation or damage caused by stress concentration, and improving the stability and safety of the battery stack installation. Through the precise correspondence between the tightener 1 and each clamping piece 4, all the clamping pieces 4 are tightened synchronously at the same time to achieve a fast and balanced clamping process, which is beneficial to improving the assembly efficiency. At the same time, it ensures that the clamping piece 4 reaches a consistent pre-tightening force and improves the overall assembly accuracy.
[0041] In some embodiments, see Figure 1 The airtightness detection mechanism includes a distribution manifold 8 installed on the sleeve 14, one end of the distribution manifold 8 is connected to each air inlet of the battery stack 3, and the other end is provided with a connector 2 for connecting to a gas supply device. The distribution manifold 8 is connected to all the air inlets of the battery stack 3 at one time, so as to realize the synchronous air supply to each battery board in the battery stack 3, greatly improve the inflation efficiency, simplify the operation process, reduce the operation time and labor cost, and the distribution manifold 8 realizes the synchronous management of all the air inlets of the battery stack 3, so that the battery stack 3 is uniformly inflated and pressure monitored during the airtightness test, so as to ensure the comprehensiveness and accuracy of the test results, and help to timely discover and locate the leakage point. The distribution manifold 8 is installed on the sleeve 14 and is tightly combined with the battery stack 3, which effectively avoids the distribution manifold 8 from falling off or gas leakage during the inflation process, and improves the stability and safety of the inflation operation, which is especially important when repeated inflation detection is required or under dynamic conditions.
[0042] In order to better understand the technical solution of the fuel cell stack gas tightness detection device disclosed in the present invention, the following is an explanation in combination with the relatively most preferred technical features.
[0043] See also Figures 1 to 4The present disclosure provides a stack airtightness detection device including a workbench 7, the workbench 7 is provided with a receiving surface 10, the receiving surface 10 is provided with a groove 13 for placing the stack 3, at least one side wall of the groove 13 is provided with a fixing mechanism capable of fixing the stack from the side of the stack 3, the fixing mechanism includes a mounting hole 9 provided on the side wall of the groove 13, a movable plate 5 installed in the mounting hole 9, and a fixing member for abutting the movable plate 5 against the stack 3 located in the groove 13, the movable plate 5 abuts the stack 3 and is locked by the fixing member, so as to effectively prevent the stack 3 from shifting during the detection process, and the stack 3 can be adjusted by using a fixing member. The movable plate 5 of the joint clamps the battery stack 3 to facilitate the installation and disassembly of the battery stack 3 and enable the workbench 7 to clamp battery stacks 3 of different specifications. The fixing parts include multiple fixing plates 12 located outside the mounting hole 9 and fixing pins 6 located on the fixing plates 12. The fixing pins 6 pass through the fixing plates 12 and are connected to the movable plate 5. The multiple fixing plates 12 are evenly arranged along the length direction of the mounting hole 9. The multiple fixing plates 12 are evenly arranged along the length direction of the mounting hole 9. Each fixing plate 12 is an independent supporting point. The multiple fixing plates 12 work together. Even if a fixing plate 12 becomes loose or fails, the other fixing plates 12 are still It can continue to provide necessary support, enhance the system's fault tolerance to failure of the fixed plate 12, and improve the overall reliability. It adopts multi-point fixation, and through the joint action of multiple fixed plates 12 and fixed pins 6, it can distribute the force more evenly and enhance the stability of the connection. The fixed pin 6 includes a shaft and a gripping portion. One end of the shaft is connected to the movable plate 5, and the other end is connected to the gripping portion. The gripping portion is located outside the fixed plate 12 and is used to limit the stroke of the shaft, so that the fixed pin 6 can adjust the stroke of the movable plate 5. The movable plate 5 is an L-shaped plate used to increase the contact area with the battery stack 3. The L-shaped plate provides a larger The surface contact area, the pressure on the battery stack 3 can be distributed more evenly, preventing local stress concentration, and protecting the battery stack 3 from damage caused by uneven pressure. The clamping mechanism is located on the workbench 7 and above the receiving surface 10, so that the clamping mechanism can clamp the end of the battery stack 3 away from the receiving surface 10. The clamping mechanism includes a sleeve 14, a plurality of clamping members 4 installed on the sleeve 14, and a tightener 1 for tightening the clamping members 4. The tightener 1 is installed on the workbench 7 and above the receiving surface 10. The plurality of clamping members 4 are evenly arranged on the sleeve 14, and the tightener 1 is corresponding to the clamping members 4.By accurately corresponding the tightener 1 to each clamping piece 4, all the clamping pieces 4 are tightened synchronously at the same time, realizing a fast and balanced clamping process, which is beneficial to improving the assembly efficiency, and at the same time ensuring that the clamping pieces 4 reach a consistent preload, thereby improving the overall assembly accuracy. The airtight detection mechanism is used to detect whether there is a leak in the battery stack 3 after the battery stack 3 is fixed by the fixing mechanism and clamped by the clamping mechanism. The airtight detection mechanism includes a distribution manifold 8 installed on the sleeve 14, one end of the distribution manifold 8 is connected to each air inlet of the battery stack 3, and the other end of the distribution manifold 8 includes a connector 2 for connecting to a gas supply device. The distribution manifold 8 is connected to all the air inlets of the battery stack 3 at one time, thereby realizing synchronous gas supply to each battery plate in the battery stack 3, so that the battery stack 3 is uniformly inflated and pressure monitored during the airtightness test, thereby ensuring the comprehensiveness and accuracy of the test results, and facilitating timely discovery and location of leaks. The battery stack airtightness detection device can be applied to battery stack tooling of different specifications, thereby reducing the time required for the tooling process, and thereby improving the efficiency of the battery stack airtightness detection.
[0044] In summary, the battery stack airtightness detection device disclosed in the present invention has the following advantages: the workbench 7 is provided with a receiving surface 10, and the receiving surface 10 is provided with a groove 13 for placing the battery stack 3, and the battery stack 3 is placed in the groove 13. At least one side wall of the groove 13 is provided with a movable plate 5 that can fix the battery stack 3 from the side of the battery stack 3, and the stroke of the movable plate 5 is adjusted by the fixing pin 6 to clamp or loosen the battery stack 3 to realize the loading and unloading of the battery stack 3. A sleeve 14 and a clamping piece 4 installed on the sleeve 14 are provided on the workbench 7 and located above the receiving surface 10. The clamping piece 4 is adjusted by the tightening device 1 to clamp the end of the battery stack 3 away from the receiving surface 10, and the gas supply device fills the distribution manifold 8 with non-ferrous gas to detect whether there is a leak in the battery stack 3. The battery stack airtightness detection device can be applied to tooling of battery stacks 3 of different specifications, reducing the time required for the tooling process, which is conducive to improving the airtightness detection efficiency of the battery stack.
[0045] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.
[0046] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A stack gas tightness detection device, characterized in that: include: A workbench (7), the workbench (7) being provided with a receiving surface (10), the receiving surface (10) being provided with a groove (13) for placing a battery stack (3), and at least one side wall of the groove (13) being provided with a fixing mechanism capable of fixing the battery stack (3) from a side surface thereof; A clamping mechanism, the clamping mechanism being located on the workbench (7) and above the receiving surface (10), so that the clamping mechanism can clamp an end of the battery stack (3) away from the receiving surface (10); An airtightness detection mechanism is used to detect whether there is an air leakage point in the battery stack (3) after the battery stack (3) is fixed by the fixing mechanism and clamped by the clamping mechanism.
2. The gas tightness detection device for a fuel cell stack according to claim 1, characterized in that: The fixing mechanism comprises a mounting hole (9) arranged on a side wall of the groove (13), a movable plate (5) installed in the mounting hole (9), and a fixing member used for abutting the movable plate (5) against the battery stack (3) located in the groove (13).
3. The stack gas tightness detection device according to claim 2, characterized in that: The movable plate (5) is an L-shaped plate.
4. The stack gas tightness detection device according to claim 2, characterized in that: The fixing member comprises a plurality of fixing plates (12) located outside the mounting hole (9) and fixing pins (6) located on the fixing plates (12); the fixing pins (6) pass through the fixing plates (12) and are connected to the movable plate (5).
5. The fuel cell stack gas tightness detection device according to claim 4, characterized in that: The fixing pin (6) comprises a shaft portion and a gripping portion, one end of the shaft portion abuts against the movable plate (5) and the other end is connected to the gripping portion, and the gripping portion is located outside the fixing plate (12) and is used to limit the travel of the shaft portion.
6. The gas tightness detection device for a fuel cell stack according to claim 4, characterized in that: The plurality of fixing plates (12) are evenly arranged along the length direction of the mounting hole (9).
7. The fuel cell stack gas tightness detection device according to any one of claims 1 to 6, characterized in that: The clamping mechanism comprises a sleeve (14) capable of being sleeved on an end of the battery stack (3) away from the receiving surface (10), a plurality of clamping members (4) mounted on the sleeve (14), and a tightener (1); the tightener (1) can cause the sleeve (14) to clamp the end of the battery stack (3) away from the receiving surface (10) by screwing the clamping members (4).
8. The fuel cell stack gas tightness detection device according to claim 7, characterized in that: The tightener (1) is installed on the workbench (7) and is located above the receiving surface (10).
9. The fuel cell stack gas tightness detection device according to claim 7, characterized in that: The plurality of pressing members (4) are evenly arranged on the sleeve (14), and the tightener (1) and the pressing members (4) are arranged in a one-to-one correspondence.
10. The fuel cell stack gas tightness detection device according to claim 7, characterized in that: The airtight detection mechanism comprises a distribution manifold (8) mounted on the sleeve (14), one end of the distribution manifold (8) being connected to each air inlet of the fuel cell stack (3), and the other end being provided with a connector (2) for connecting to an air supply device.