Fuel cell end plate packaging structure and packaging method

Abstract

The invention belongs to the technical field of fuel cell stack packaging, and particularly relates to a fuel cell end plate packaging structure and a packaging method. The device comprises a shell, an insulating plate, a floating end plate and a telescopic packaging part, the shell is arranged outside the reactor core, a plurality of connecting through holes are formed in the top end face of the shell, and the outer edges of the upper ends of the connecting through holes are higher than the top end face of the shell; the insulating plate is arranged on the top end surface of the reactor core; the floating end plate is arranged on the insulating plate; a plurality of groups of telescopic packaging parts are arranged, and the bottom end surface of each group of telescopic packaging parts is connected to the top end surface of the floating end plate; the top end of each telescopic packaging part is connected into a connecting through hole in the top end of the shell. And the group number of the telescopic packaging parts is the same as the number of the connecting through holes in the top end of the shell. According to the invention, the packaging assemblies are sequentially screwed in, so that interlocking between the assemblies is achieved while reactor core packaging is realized, anti-loosening of a thread pair is inhibited, and the reliability of the packaging assemblies is improved; the problem of anti-loosening failure of a heavy-load thread pair and the risk that the failure is not easy to perceive are effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel cell stack packaging, and particularly relates to a fuel cell end plate packaging structure and a packaging method. BACKGROUND

[0002] As a special structure product composed of multiple single cells, a fuel cell stack is packaged by using a fixed shell, a floating end plate, a disc spring set and a top plate to ensure the stability of the stack core structure and provide necessary protection, so as to meet the size floating of the stack core and provide stable packaging force.

[0003] In order to realize the transmission of the packaging force from the floating end plate, the disc spring set and the top plate to the shell, the existing technology adopts a threaded connection form between the shell and the top plate. This structure can realize the transmission of the packaging load and meet the size floating of the stack core without batches. However, the threaded connection structure inevitably has the problem of loosening, especially in the continuous vibration and impact working conditions during the use of the fuel cell, the problem of loosening of the threaded load transmission structure must be considered. This failure problem is inside the fuel cell packaging and is not easy to detect and perceive, and the failure has a great impact on the performance and stability of the fuel cell, and at the same time, the safety problem of hydrogen leakage caused by the failure of the stack core. The existing conventional anti-loosening method of the thread cannot meet the requirements of structure simplification and convenient disassembly and assembly at the same time. SUMMARY

[0004] The application provides a fuel cell end plate packaging structure and a packaging method. The purpose is to provide a fuel cell end plate packaging structure and a packaging method which can solve the problem of loosening failure of the threaded pair during use to improve the reliability, stability and service life of the fuel cell stack.

[0005] To achieve the above purpose, the technical solution adopted by the application is: A fuel cell end plate packaging structure for packaging a fuel cell stack core, comprising a shell, the shell being arranged outside the stack core, a plurality of connecting through holes being arranged on the top end surface of the shell, and the upper end eaves of the connecting through holes being higher than the top end surface of the shell; an insulating plate, the insulating plate being arranged on the top end surface of the stack core; a floating end plate, the floating end plate being arranged on the insulating plate; a plurality of sets of telescopic packaging parts, the bottom end surface of each set of telescopic packaging parts being connected to the top end surface of the floating end plate, the top end of each set of telescopic packaging parts being connected to the connecting through hole on the top end of the shell, and the number of sets of telescopic packaging parts being the same as the number of connecting through holes on the top end of the shell.

[0006] The plurality of connecting through holes are uniformly arranged on the top end surface of the shell; a first sunken platform and a second sunken platform are arranged from top to bottom on the inner side wall of each connecting through hole; a fourth thread pair outer thread is arranged on the outer side wall of the upper end of the connecting through hole; a second thread pair inner thread is arranged on the inner side wall between the first sunken platform and the second sunken platform; a first thread pair inner thread is arranged on the inner side wall between the second sunken platform and the bottom end of the connecting through hole.

[0007] The upper surface of the floating end plate is provided with a plurality of grooves for connecting the telescopic packaging part, and the grooves are provided with a first circular annular protrusion for clamping the telescopic packaging part; the height of the first circular annular protrusion is greater than the thickness of the plate surface of the floating end plate.

[0008] The telescopic packaging part comprises a disc spring group, a disc spring top disc, a top disc nut, a lock nut, a fixing shaft and a flange cover; the disc spring group is connected to the upper surface of the floating end plate; the top end of the disc spring group is connected with the top disc nut through the disc spring top disc; the upper part of the side wall of the top disc nut is threadedly connected with the connecting through hole on the shell; the top of the top disc nut is threadedly connected with the lock nut; the central position of the lock nut is vertically threadedly connected with the fixing shaft; the flange cover is threadedly connected to the outer side wall of the connecting through hole on the shell, and the top end of the fixing shaft is in contact with the flange cover.

[0009] The disc spring top disc is in a circular truncated cone structure; a circular groove is formed in the central position of the top and bottom of the disc spring top disc respectively, and the diameter of the circular groove in the top is smaller than that of the circular groove in the bottom; a second circular annular protrusion is arranged in the central position of the circular groove in the bottom; the disc spring group is arranged between the outer eaves of the circular groove in the bottom and the floating end plate; the second circular annular protrusion is clamped on the floating end plate; and the circular groove in the top is used for clamping the top disc nut.

[0010] The top disc nut is a cylinder with a through hole in the center; a fourth tightening mechanism is arranged on the inner side wall of the top of the through hole; a clamping boss is arranged on the lower outer side wall of the top disc nut; and a first thread pair outer thread is arranged on the outer side wall of the top disc nut above the clamping boss.

[0011] The lock nut is a disc structure with a through hole in the center; a second thread pair outer thread is arranged on the outer side wall of the lock nut; a third tightening mechanism for torque tightening, tightening and dismounting of the lock nut is arranged on the upper side wall of the through hole; a third thread pair inner thread for threadedly connecting with the fixing shaft after the fixing shaft is inserted is arranged on the lower side wall of the through hole; the fixing shaft is an integral structure composed of a shaft body and a shaft shoulder; the shaft shoulder is a disc, the center of the shaft shoulder is located on the top of the shaft body, and a second tightening mechanism for screwing the shaft body is arranged in the central position of the top of the shaft shoulder; the shaft body is a cylinder, and a third thread pair outer thread for connecting with the lock nut is arranged on the outer side wall of the shaft body.

[0012] The flange cover is a disc structure, and a recess is arranged at the lower part of the flange cover, and a fourth internal thread of a thread pair is arranged on the inner side wall of the recess for connecting with the shell.

[0013] The top disc is a circular truncated cone structure, and a circular groove is arranged at the top and bottom center positions respectively, and the diameter of the circular groove at the top is smaller than that of the circular groove at the bottom; a second circular annular protrusion is arranged at the center position of the circular groove at the bottom; a disc spring group is arranged between the outer eaves of the circular groove at the bottom and the floating end plate; the second circular annular protrusion is clamped on the floating end plate; the circular groove at the top is used for clamping a top disc nut; the top disc nut is a cylinder with a through hole at the center; a fourth tightening mechanism is arranged on the inner side wall at the top of the through hole; a clamping boss is arranged on the outer side wall of the lower part of the top disc nut; a first external thread of a thread pair is arranged on the outer side wall of the top disc nut above the clamping boss; the locknut is a disc structure with a through hole at the center; a second external thread of a thread pair is arranged on the outer side wall of the locknut; a third tightening mechanism for torque tightening, locknut tightening and dismounting is arranged on the upper side wall of the through hole; a third internal thread of a thread pair for connecting with the fixed shaft after the fixed shaft is inserted is arranged on the lower side wall of the through hole; the fixed shaft is an integrated structure composed of a shaft body and a shaft shoulder; the shaft shoulder is a disc, and the center of the shaft shoulder is arranged at the top of the shaft body, and a second tightening mechanism for tightening the shaft body is arranged at the center position of the top of the shaft shoulder; the shaft body is a cylinder, and a third external thread of a thread pair for connecting with the locknut is arranged on the outer side wall of the shaft body; the flange cover is a disc structure, and a recess is arranged at the lower part of the flange cover, and a fourth internal thread of a thread pair is arranged on the inner side wall of the recess for connecting with the shell; a first tightening mechanism for controlling the freedom degree locking of the fixed shaft is arranged on the outer side wall of the flange cover.

[0014] A packaging method of a fuel cell end plate packaging structure, which adopts a fuel cell end plate packaging structure, and comprises the following steps: Step one, the top disc nut is connected with the shell through a first thread pair; Step two, the locknut is connected with the shell and the fixed shaft through a second thread pair and a third thread pair respectively; Step three, the flange cover is connected with the shell through a fourth thread pair, and the shaft shoulder of the fixed shaft is fixed in the recess formed by the flange cover and the shell.

[0015] Advantages: 1. The positive and reverse thread pair of the application is opposite in rotation direction and interlocked, so as to realize the interlocking between the packaging assemblies and inhibit the loosening of the thread pair, and the reliability of the packaging assemblies is improved.

[0016] 2. The multiple self-locking and interlocking effectively solve the loosening failure problem of the heavy load thread pair and the risk that the failure is not easy to be detected.

[0017] 3、The application can judge the overall structure by the state of the outside easy-to-observe non-load structure, and has good maintainability.

[0018] 4、The multiple self-locking and interlocking structure of the application does not affect the realization of the internal structure function when the outer structure fails, and the internal structure has very low failure risk under the self-locking when the parts are completed, and the overall structure has good robustness.

[0019] 5、The anti-loose structure of the application is connected through a standard threaded pair, has good processability, and can be disassembled and assembled multiple times.

[0020] 6、The application uses some parts of some existing packaging schemes, saves cost, and has compact structure.

[0021] The above description is only a summary of the technical solutions of the application, in order to more clearly understand the technical means of the application, and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 is a structural section view of the application.

[0024] Figure 2 is a detailed structural view of the top disc nut in the application.

[0025] Figure 3 is a sectional view of the top disc nut in the application.

[0026] Figure 4 is a detailed structural view of the anti-loose nut in the application.

[0027] Figure 5 is a detailed structural view of the fixed shaft in the application.

[0028] Figure 6 is a detailed structural view of the flange cover in the application.

[0029] Figure 7 is a detailed structural view of the housing in the application.

[0030] Figure 8 and Figure 9 are partial schematic views of the locking state of two different specifications of fuel cells in the application.

[0031] Figure 10 Figure 1 is an exploded view of the present application.

[0032] Figure 11 Figure 2 is a schematic diagram of the core pre-pressing of the present application.

[0033] Figure 12 Figure 3 is a schematic diagram of the middle pressing rod structure of the present application.

[0034] Figure 13 Figure 4 is a schematic diagram of the structure of the tightening tool of the present application.

[0035] Figure 14 Figure 5 is a sectional view of the floating end plate of the present application.

[0036] Figure 15 Figure 6 is a top view of the floating end plate of the present application.

[0037] Figure 16 Figure 7 is a schematic diagram of the disc spring top plate of the present application.

[0038] Figure 1 is an exploded view of the present application. Figure 2 is a schematic diagram of the core pre-pressing of the present application. Figure 3 is a schematic diagram of the middle pressing rod structure of the present application. Figure 4 is a schematic diagram of the structure of the tightening tool of the present application. Figure 5 is a sectional view of the floating end plate of the present application. Figure 6 is a top view of the floating end plate of the present application. Figure 7 is a schematic diagram of the disc spring top plate of the present application. 1, floating end plate; 2, disc spring group; 3, disc spring top plate; 4, top plate nut; 5, lock nut; 6, fixed shaft; 7, flange cover; 8, housing; 9, insulation plate; 10, core; 11, tightening tool; 12, pressing rod; 13, first screw pair inner thread; 14, second screw pair inner thread; 15, third screw pair outer thread; 16, fourth screw pair outer thread; 17, first contact surface; 18, second contact surface; 19, first sink; 20, second sink; 21, fourth screw pair inner thread; 22, first tightening mechanism; 23, shaft shoulder; 24, second tightening mechanism; 25, second screw pair outer thread; 26, third screw pair inner thread; 27, third tightening mechanism; 28, first screw pair outer thread; 29, through hole; 30, fourth tightening mechanism; 31, first screw pair; 32, second screw pair; 33, third screw pair; 34, fourth screw pair; 35, fifth tightening mechanism; 36, tightening boss; 37, groove; 38, first circular ring-shaped protrusion; 39, second circular ring-shaped protrusion; 40, clamping boss; 41, disc spring top plate guide hole. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Embodiment one: According to Figures 1-16The application discloses a fuel cell end plate packaging structure for packaging a fuel cell core 10. A shell 8 is arranged outside the core 10, and a plurality of connecting through holes are arranged on the top end surface of the shell 8, and the upper end outer eaves of the connecting through holes are higher than the top end surface of the shell 8. An insulating plate 9 is arranged on the top end surface of the core 10. A floating end plate 1 is arranged on the insulating plate 9. A plurality of groups of telescopic packaging parts are arranged, the bottom end surface of each group of the telescopic packaging parts is connected to the top end surface of the floating end plate 1, the top end of each group of the telescopic packaging parts is connected into the connecting through hole on the top end of the shell 8, and the number of the groups of the telescopic packaging parts is the same as the number of the connecting through holes on the top end of the shell 8.

[0041] The core 10 is a component formed by stacking single cells and is a carrier of a fuel cell chemical reaction.

[0042] The insulating plate 9 in the embodiment is made of an insulating material and plays a role of insulation between the core 10 and the shell 8 and the like.

[0043] The shell 8 in the embodiment is a packaging structure of the core 10 and provides a packaging load force required by the core 10 to work and a stable and reliable internal environment.

[0044] In some embodiments, the plurality of connecting through holes on the shell 8 are uniformly arranged on the top end surface of the shell 8, a first sink 19 and a second sink 20 are arranged on the inner side wall of each connecting through hole from top to bottom, a fourth screw pair outer thread 16 is arranged on the outer side wall of the upper end of the connecting through hole, a second screw pair inner thread 14 is arranged on the inner side wall between the first sink 19 and the second sink 20, and a first screw pair inner thread 13 is arranged on the inner side wall between the second sink 20 and the bottom end of the connecting through hole.

[0045] The shell 8 provides necessary mounting structures, realizes mounting and fastening of the telescopic packaging parts, and realizes transmission of the packaging load of the core 10 to the shell 8 by the telescopic packaging parts.

[0046] In some embodiments, the upper surface of the floating end plate 1 is provided with a plurality of grooves 37 for connecting the telescopic packaging part as the mounting platform of the disc spring set 2, providing the mounting and load transmission plane of the disc spring set 2, and uniformly transmitting the transmitted packaging load of the disc spring set 2 to the floating end plate 1; a first circular annular protrusion 38 for clamping the telescopic packaging part is arranged in the groove 37; the first circular annular protrusion 38 serves as a guide column for the disc spring set 2, providing a limiting guide for the disc spring set 2 during compression deformation, preventing misplacement of the disc spring set 2 during deformation; the inside of the first circular annular protrusion 38 is a disc spring top disc guide hole 41, providing a guide for the disc spring top disc 3, and providing a limit when the disc spring top disc 3 moves up and down, preventing misplacement during load transmission; the height of the first circular annular protrusion 38 is greater than the thickness of the plate surface of the floating end plate 1. The floating end plate 1 provides mounting and guiding functions for the disc spring set 2 in the telescopic packaging part, and can uniformly disperse the load of the disc spring set 2 to the entire cross section of the core 10. In specific applications, the floating end plate 1 can be a metal structure or a non-metal structure with sufficient strength. The non-metal structure in this embodiment uses a polyphenylene sulfide (PPS) filled with a certain proportion of glass fiber, an epoxy resin and a glass fiber laminated composite material, or a polyphenylene sulfide (PPS) filled with glass fiber and an aluminum alloy composite injection molding material. In specific applications, different stack design schemes are different, so the non-metallic structure materials used are also different; some non-metallic structure materials do not add glass fiber, and some add 30% or 40% mass ratio of glass fiber; the usual material is a mixture of polyphenylene sulfide and 40% mass ratio of glass fiber.

[0047] In some embodiments, the telescopic packaging part includes a disc spring set 2, a disc spring top disc 3, a top disc nut 4, a lock nut 5, a fixed shaft 6, and a flange cover 7; the disc spring set 2 is connected to the upper surface of the floating end plate 1; the top end of the disc spring set 2 is connected with the top disc nut 4 through the disc spring top disc 3; the upper side wall of the top disc nut 4 is threadedly connected with the connecting through hole on the shell 8; the top of the top disc nut 4 is threadedly connected with the lock nut 5; the fixed shaft 6 is vertically threadedly connected at the center position of the lock nut 5; the flange cover 7 is threadedly connected to the outer side wall of the connecting through hole of the shell 8, and is in contact with the top end of the fixed shaft 6.

[0048] The disc spring set 2 is arranged between the core 10 and the shell 8 structure, and provides a stable packaging force for the fuel cell stack by deformation. In specific applications, the disc spring set 2 can use standard disc springs or non-standard disc springs combined by one group, multiple groups, same direction or opposite direction. This scheme only uses one group of disc springs for demonstration, and can also be adapted to different product structures without disc spring sets.

[0049] In some embodiments, the disc spring top plate 3 is a circular truncated cone structure; a circular groove is formed in the center of the top and bottom, respectively, and the diameter of the circular groove in the top is smaller than that in the bottom; a second circular ring-shaped protrusion 39 is arranged in the center of the circular groove in the bottom; a disc spring group 2 is arranged between the outer edge of the circular groove in the bottom and the floating end plate 1; the second circular ring-shaped protrusion 39 is clamped on the floating end plate 1; and the circular groove in the top is used for clamping a top plate nut 4.

[0050] In specific applications, the disc spring group 2 is used to transfer the pressure of the press to the disc spring top plate 3 during the pre-pressing process of the reactor core 10, and to transfer the disc spring force to the shell 8 after the pre-pressing is completed, thereby providing a stable force transmission plane for the disc spring group 2.

[0051] In some embodiments, the top plate nut 4 is a cylinder with a through hole 29 in the center; a fourth tightening mechanism 30 is arranged on the inner side wall of the top of the through hole 29; a clamping boss 40 is arranged on the lower outer side wall of the top plate nut 4; and a first threaded pair outer thread 28 is arranged on the outer side wall of the top plate nut 4 above the clamping boss 40.

[0052] In specific applications, the top plate nut 4 transfers the disc spring force transmitted by the disc spring top plate 3 to the shell 8 through the first threaded pair 31. As shown in the figure, Figure 2 The outer side of the top plate nut 4 has a first threaded pair 31 that cooperates with the inner side of the connecting through hole on the shell 8; the first threaded pair 31 can be left-handed or right-handed, and in this embodiment, the first threaded pair 31 is left-handed. The structural strength of the first threaded pair outer thread 28 of the top plate nut 4 needs to be able to withstand the packaging force generated by the disc spring group 2. As shown in the figure, Figure 2 The end of the top plate nut 4 is provided with a tightening structure for docking with the tightening tool 11 to facilitate torque tightening. After the pre-pressing is completed, the fourth tightening mechanism 30 on the top plate nut 4 is tightened by the docking of the tightening tool 11. The through hole 29 arranged in the middle of the top plate nut 4 is used for the passage of the press rod 12 to complete the tightening operation.

[0053] The tightening tool 11 in this embodiment includes a hollow hexagonal cylinder and an integrated structure of four tightening bosses 36; the four tightening bosses 36 are vertically and uniformly arranged on the top surface of the hollow hexagonal cylinder; and the side surface of the hexagonal cylinder constitutes a fifth tightening mechanism 35.

[0054] The fourth tightening mechanism 30 in this embodiment adopts a convex and concave groove structure, which matches with the convex and concave structure at the bottom of the tightening tool 11 and is used for screwing the top plate nut 4. The fourth tightening mechanism 30 cooperates with the tightening boss 36 to transmit the tightening torque.

[0055] Specifically, during the core pre-pressing packaging process, the pressure equipment applies a vertical downward packaging force 34 kN to the core 10 through the pressure rod 12, the disc spring top disc 3, the disc spring group 2, the floating end plate 1, and the insulating plate 9 in turn, at which time the disc spring group 2 reaches the rated compression amount. At this time, the tightening tool 11 rotates the top disc nut 4 through the fourth tightening mechanism 30 and the tightening boss 36, until the top disc nut 4 presses the disc spring top disc 3, and the packaging load force applied by the pressure rod 12 on the disc spring top disc 3 is transmitted to the shell 8 through the first threaded pair 31 matched by the top disc nut 4 and the shell 8.

[0056] In some embodiments, the lock nut 5 is a disc structure with a through hole in the center; the outer side wall of the lock nut 5 is provided with a second threaded pair outer thread 25; the upper side wall of the through hole is provided with a third tightening mechanism 27 for torque tightening, realizing the tightening and dismounting of the lock nut 5; the lower side wall of the through hole is provided with a third threaded pair inner thread 26 for the insertion of the fixed shaft 6 and the threaded connection with the lower part of the fixed shaft 6; the fixed shaft 6 is an integrated structure composed of a shaft body and a shaft shoulder 23; the shaft shoulder 23 is disc-shaped, the center of the shaft shoulder 23 is located at the top of the shaft body, and the center of the top is provided with a second tightening mechanism 24 for tightening the shaft body; the shaft body is cylindrical, and the outer side wall of the shaft body is provided with a third threaded pair outer thread 15 for connecting with the lock nut 5.

[0057] In actual use, the lock nut 5 is connected with the shell 8 through the second threaded pair 32, which can be left-handed or right-handed, but needs to be opposite to the first threaded pair 31, and this embodiment takes the second threaded pair 32 as right-handed for technical description. The third threaded pair inner thread 26 in the center through hole of the lock nut 5 can be left-handed or right-handed, but needs to be opposite to the second threaded pair 32 and same as the first threaded pair 31, and this embodiment takes the third threaded pair 33 as left-handed for technical description, which is connected with the fixed shaft 6. As shown in the figure, the third tightening mechanism 27 structure in the lock nut 5 matches the tool, which is convenient for torque tightening, realizing the tightening and dismounting of the lock nut 5. Figure 4

[0058] The fixed shaft 6 is connected with the lock nut 5 through the third threaded pair 33, the shaft shoulder 23 structure is fixed in the groove formed by the sink of the shell 8 and the flange cover 7, and the fixed shaft 6, the flange cover 7, and the shell 8 are matched in the axial direction by using interference size, limiting the freedom of the fixed shaft 6 in the axial direction and around the axial direction. As shown in the figure, the shaft shoulder 23 of the fixed shaft 6 has the second tightening mechanism 24 for the dismounting and tightening tool, which is convenient for torque tightening. Figure 5

[0059] The second tightening mechanism 24 and the third tightening mechanism 27 in this embodiment are both hexagonal grooves.

[0060] ​​In some embodiments, the flange cover 7 is a disc structure, and a groove is arranged at the lower part of the flange cover 7, and a fourth internal thread 21 for connecting with the shell 8 is arranged on the inner side wall of the groove; a first tightening mechanism 22 is arranged on the outer side wall of the flange cover 7 for screwing to control the freedom locking of the fixed shaft 6.

[0061] The flange cover 7 cooperates with the shell 8 to fix the fixed shaft 6, and the freedom locking of the fixed shaft 6 is realized. Meanwhile, the fourth thread pair 34 is used to cooperatively connect between the flange cover 7 and the shell 8, which can be left-handed or right-handed, but needs to be opposite to the first thread pair 31 and the third thread pair 33, and same as the second thread pair 32. In this embodiment, the fourth thread pair 34 is right-handed for technical description. The sealing surface between the flange cover 7 and the shell 8 is sealed by a sealing ring or other ways, so as to realize the isolation between the inside and outside of the shell 8 to achieve the protection requirements, as shown in Figure 7 and Figure 8 The center of the shaft shoulder 23 has a tightening structure for the dismounting tool to be in contact, which is convenient for tightening with a fixed torque.

[0062] The first tightening mechanism 22 is arranged to facilitate the tightening of the flange cover 7.

[0063] Embodiment two: Referring to Figures 1-16 , a packaging method of a fuel cell end plate packaging structure, using the fuel cell end plate packaging structure, comprising the following steps: Step one, the top disc nut 4 is connected with the shell 8 through the first thread pair 31; Step two, the lock nut 5 is connected with the shell 8 and the fixed shaft 6 through the second thread pair 32 and the third thread pair 33 respectively; Step three, the flange cover 7 is connected and fastened with the shell 8 through the fourth thread pair 34, and the shaft shoulder 23 of the fixed shaft 6 is fixed in the groove formed by the flange cover 7 and the shell 8.

[0064] In actual use, the embodiment realizes the freedom locking of each packaging assembly through the interlocking action of the multiple thread pairs of the packaging assembly between the core 10 and the shell 8, and then realizes the anti-loosening function of the thread connection pair, effectively improves the stability and reliability of the fuel cell, and increases the service life of the fuel cell.

[0065] The implementation mode of the embodiment is as follows: As shown in Figure 8 and Figure 11 , the packaging assembly is connected through the thread pair, and the tightening tool 11 is used for fixed-torque tightening in the installation process. The anti-loosening function is realized in the following way: The top plate nut 4 is connected to the shell 8 through a left-handed thread pair, and the packaging force is transmitted from the top plate nut 4 to the shell 8 through the first thread pair 31. The adjustable force transmission structure of the first thread pair 31 can meet the tolerance fluctuation of the length of the core 10, such as Figure 9 shown.

[0066] The top plate nut 4 transmits the packaging load through the first thread pair 31, which is the main risk point of the thread pair loosening failure. Figure 9 As shown, the anti-loosening nut 5 is fixedly screwed on the housing 8 connected to the top plate nut 4 by the second thread pair 32. When the first thread pair 31 is loosened, the top plate nut 4 moves along the Figure 8 As the top nut 4 moves upward in the anti-loosening direction, it simultaneously applies a torque to the locknut 5, recorded as T1, through the first contact surface 17 between the top nut 4 and the locknut 5. Since the first and second thread pairs 31 and 32 move in opposite directions, the direction of the anti-loosening torque T1 corresponds to the tightening direction of the second thread pair 32. This ensures that the top nut 4 is self-locked by the locknut 5, preventing anti-loosening of the first thread pair 31.

[0067] The anti-loosening nut 5 is connected to the housing 8 and the fixed shaft 6 respectively through the second thread pair 32 and the third thread pair 33. Since the second thread pair 32 and the third thread pair 33 rotate in opposite directions and the fixed shaft 6 is fixed relative to the housing 8, the anti-loosening nut 5 is self-locking.

[0068] The flange cover 7 is fastened to the housing 8 via a fourth thread pair 34 to limit the axial position of the fixed shaft 6. The flange cover 7 can be sealed to the housing 8 via a sealing ring or other structural sealing structure, thereby protecting the housing 8.

[0069] described Figure 9 As shown, the shoulder 23 of the fixed shaft 6 is fixed in the groove formed by the flange cover 7 and the housing 8. When the fixed shaft 6 is connected to the third thread pair 33 of the locknut 5, its screwing direction is limited by the housing 8. When the fixed shaft 6 is screwed out, its screwing direction is limited by the flange cover 7. Simultaneously, a torque, recorded as T2, is applied to the flange cover 7 through the second contact surface 18 between the fixed shaft 6 and the flange cover 7. Because the third thread pair 33 and the fourth thread pair 34 move in opposite directions, the direction of the anti-loosening torque T2 is the tightening direction of the fourth thread pair 34. This achieves self-locking and interlocking fixation of the fixed shaft 6.

[0070] The flange cover 7 lacks a self-locking mechanism, but it does not serve as a load-bearing structure and is located outside the stack in an easily observable position, allowing for timely detection and mitigation of any failure. A reverse-loosening failure of the fourth thread pair 34 only involves a functional failure of the fixed shaft 6 and does not affect the self-locking mechanism formed by the top plate nut 4 and the locknut 5. The stability and reliability of the package load of the core 10 are still maintained.

[0071] To sum up, the application realizes self-locking and interlocking between the packaging assemblies through positive and reverse interlocking of the multiple thread pairs, especially the locking of the load bearing structure, effectively improves the reliability and stability, and solves the problem of difficult discovery of packaging structure failure, effectively improves the service life of the fuel cell.

[0072] In the case of no conflict, the skilled in the art can combine the technical features related in the above examples according to the actual situation to achieve the corresponding technical effects, and the specific combinations are not described one by one here.

[0073] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0074] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0075] The above is only the preferred embodiment of the application, and the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the application still belong to the scope of the technical scheme of the application.

Claims

1. A fuel cell end plate packaging structure for packaging a fuel cell core (10), characterized in that: include A shell (8), the shell (8) is placed outside the core (10), a plurality of connecting through holes are provided on the top end surface of the shell (8), and the upper end outer edges of the connecting through holes are higher than the top end surface of the shell (8); an insulating plate (9), the insulating plate (9) being placed on the top surface of the core (10); A floating end plate (1), the floating end plate (1) being placed on the insulating plate (9); The telescopic packaging parts are provided in multiple groups, the bottom end surface of each group of telescopic packaging parts is connected to the top end surface of the floating end plate (1); the top end of each group of telescopic packaging parts is connected to the connecting through hole at the top end of the shell (8); the number of groups of telescopic packaging parts provided is the same as the number of connecting through holes at the top end of the shell (8).

2. A fuel cell end plate packaging structure according to claim 1, characterized in that: The plurality of connecting through holes on the shell (8) are evenly arranged on the top surface of the shell (8); a first sink (19) and a second sink (20) are arranged on the inner side wall of each connecting through hole from top to bottom; a fourth thread pair external thread (16) is arranged on the outer side wall of the upper end of the connecting through hole; a second thread pair internal thread (14) is arranged on the inner side wall between the first sink (19) and the second sink (20); and a first thread pair internal thread (13) is arranged on the inner side wall between the second sink (20) and the bottom end of the connecting through hole.

3. The fuel cell end plate packaging structure according to claim 1, wherein: The upper surface of the floating end plate (1) is provided with a plurality of grooves (37) for connecting the telescopic packaging part, and a first annular protrusion (38) for clamping the telescopic packaging part is provided in the groove (37); the height of the first annular protrusion (38) is greater than the thickness of the floating end plate (1) plate surface.

4. A fuel cell end plate packaging structure according to claim 1 or 3, characterized in that: The telescopic packaging part includes a disc spring group (2), a disc spring top plate (3), a top plate nut (4), a locking nut (5), a fixed shaft (6) and a flange cover (7); the disc spring group (2) is connected to the upper surface of the floating end plate (1); the top of the disc spring group (2) is connected to the top plate nut (4) through the disc spring top plate (3); the upper side wall of the top plate nut (4) is threadedly connected to the connecting through hole on the shell (8); the top of the top plate nut (4) is threadedly connected to the locking nut (5); the center position of the locking nut (5) is vertically threadedly connected to the fixed shaft (6); the flange cover (7) is threadedly connected to the outer side wall of the connecting through hole on the shell (8) and contacts the top of the fixed shaft (6).

5. A fuel cell end plate packaging structure according to claim 4, characterized in that: The disc spring top plate (3) is a truncated cone structure; circular grooves are respectively provided at the top and bottom center positions thereof, and the diameter of the top circular groove is smaller than that of the bottom circular groove; a second annular protrusion (39) is provided at the center position of the bottom circular groove; a disc spring assembly (2) is provided between the outer edge of the bottom circular groove and the floating end plate (1); the second annular protrusion (39) is clamped on the floating end plate (1); and the top circular groove is used for clamping the top plate nut (4).

6. A fuel cell end plate packaging structure according to claim 4, characterized in that: The top plate nut (4) is a cylinder with a through hole (29) at the center; a fourth tightening mechanism (30) is provided on the top inner side wall of the through hole (29); a clamping boss (40) is provided on the lower outer side wall of the top plate nut (4); and a first thread pair outer thread (28) is provided on the outer side wall of the top plate nut (4) above the clamping boss (40).

7. The fuel cell end plate packaging structure according to claim 4, wherein: The anti-loosening nut (5) is a disc-shaped structure with a through hole in the center; the outer side wall of the anti-loosening nut (5) is provided with a second thread pair external thread (25); the upper side wall of the through hole is provided with a third tightening mechanism (27) for tightening with a fixed torque and realizing tightening and disassembly of the anti-loosening nut (5); the lower side wall of the through hole is provided with a third thread pair internal thread (26) for connecting with the lower thread of the fixed shaft (6) after the fixed shaft (6) is inserted; the fixed shaft (6) is an integrated structure consisting of a shaft body and a shaft shoulder (23); the shaft shoulder (23) is disc-shaped, the center of the shaft shoulder (23) is placed on the top of the shaft body, and the center position of the top thereof is provided with a second tightening mechanism (24) for tightening the shaft body; the shaft body is cylindrical, and the outer side wall of the shaft body is provided with a third thread pair external thread (15) for connecting with the anti-loosening nut (5).

8. The fuel cell end plate packaging structure according to claim 4, characterized in that: The flange cover (7) is a disc-shaped structure, with a groove provided at its lower portion, and a fourth thread pair internal thread (21) for connecting to the housing (8) provided on the inner side wall of the groove; a first tightening mechanism (22) for screwing to control the locking of the degree of freedom of the fixed shaft (6) is provided on the outer side wall of the flange cover (7).

9. The fuel cell end plate packaging structure according to claim 4, characterized in that: The disc spring top plate (3) is a truncated cone structure; a circular groove is provided at the center of the top and bottom thereof, and the diameter of the top circular groove is smaller than that of the bottom circular groove; a second annular protrusion (39) is provided at the center of the bottom circular groove; a disc spring group (2) is provided between the outer edge of the bottom circular groove and the floating end plate (1); the second annular protrusion (39) is clamped on the floating end plate (1); the top circular groove is used to clamp the top plate nut (4); the top plate nut (4) is a cylinder with a through hole in the center; a fourth tightening mechanism (30) is provided on the top inner wall of the through hole; a clamping boss (40) is provided on the lower outer wall of the top plate nut (4), and a first thread pair external thread (28) is provided on the outer wall of the top plate nut (4) above the clamping boss (40); the anti-loosening nut (5) is a disc-shaped structure with a through hole in the center; the outer wall of the anti-loosening nut (5) is provided with a second thread pair external thread (25); the upper part of the through hole The side wall is provided with a third tightening mechanism (27) for tightening with a fixed torque and realizing tightening and disassembling of the anti-loosening nut (5); the lower side wall of the through hole is provided with a third thread pair internal thread (26) for being threadedly connected to the lower part of the fixed shaft (6) after the fixed shaft (6) is inserted; the fixed shaft (6) is an integrated structure consisting of a shaft body and a shaft shoulder; the shaft shoulder (23) is disc-shaped, the center of the shaft shoulder (23) is located at the top of the shaft body, and a second tightening mechanism (24) for tightening the shaft body is provided at the center position of the top; the shaft body is cylindrical, and a third thread pair external thread (15) for connecting with the anti-loosening nut (5) is provided on the outer side wall of the shaft body; the flange cover (7) is a disc-shaped structure, and a groove is provided at the lower part thereof, and a fourth thread pair internal thread (21) for connecting with the housing (8) is provided on the inner side wall of the groove; the outer side wall of the flange cover (7) is provided with a first tightening mechanism (22) for screwing to control the locking of the degree of freedom of the fixed shaft (6).

10. A packaging method for a fuel cell end plate packaging structure, characterized in that: The fuel cell end plate packaging structure according to claim 9 includes the following steps: Step 1: The top plate nut (4) is connected to the housing (8) via the first thread pair (31); Step 2: The anti-loosening nut (5) is connected to the housing (8) and the fixed shaft (6) through the second thread pair (32) and the third thread pair (33) respectively; Step 3: The flange cover (7) is connected and fastened to the housing (8) through the fourth thread pair (34), and the shoulder of the fixed shaft (6) is fixed in the groove formed by the flange cover (7) and the housing (8).

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