A fuel cell stack and its assembly method

Abstract

This application relates to a fuel cell stack and its assembly method, comprising a first end plate and a second end plate disposed opposite to each other, with multiple individual cells disposed between the first and second end plates. Multiple first mounting blocks are fixedly mounted on the periphery of the first end plate, and multiple second mounting blocks are fixedly mounted on the periphery of the second end plate. Each first mounting block has a connecting rod, one end of which is hinged to a screw. A limit plate is fixedly mounted on the end of the connecting rod away from the screw. A nut is threaded onto the screw. The first mounting block has a first through hole for the connecting rod to pass through with damping. The limit plate abuts against the side of the first mounting block away from the second mounting block. The second mounting block has a second through hole for the screw to pass through. A clearance opening is formed on the side of the second mounting block away from the second end plate, communicating with the second through hole, allowing the screw to rotate into the second through hole. This application improves the assembly speed of the fuel cell stack.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery stack and assembly method. Background Technology

[0002] The fuel cell stack is the core component of a fuel cell system; it is a device that converts hydrogen and oxygen into electrical energy through a chemical reaction.

[0003] A fuel cell stack typically includes a first end plate and a second end plate positioned opposite each other, with multiple individual cells disposed between them. A screw is positioned between the first and second end plates, with a limiting plate fixedly mounted at one end of the screw, and a nut fitted onto the screw. Both the first and second end plates have through holes for the screw to pass through. During assembly, the first end plate is placed on the worktable of a press. Then, the individual cells are placed sequentially on the first end plate. Next, the second end plate is placed on top of the individual cells, and the press is started. The press compresses the second end plate, which presses the individual cells against the first end plate, thus ensuring that each individual cell is firmly pressed against the first end plate. While the press continues to compress the second end plate, the screw passes through the through holes, and the nut is screwed into the screw, so that the limiting plate abuts against the side of the first end plate away from the second end plate, and the nut abuts against the side of the second end plate away from the first end plate. The press is then turned off, and the cooperation of the nut, screw, and limiting plate ensures that the first and second end plates maintain the tight compression of each individual cell.

[0004] Regarding the aforementioned technologies, the inventors believe that each fuel cell stack typically has multiple sets of nuts, screws, and limiting plates for locking the first and second end plates, thereby facilitating the clamping of individual cells by the first and second end plates. However, during fuel cell stack assembly, multiple nuts need to be screwed into the screws, thus reducing the assembly speed of the fuel cell stack. Summary of the Invention

[0005] To improve the assembly speed of fuel cell stacks, this application provides a fuel cell stack and an assembly method thereof.

[0006] This application provides a fuel cell stack and its assembly method, which adopts the following technical solution:

[0007] A fuel cell stack includes a first end plate and a second end plate disposed opposite to each other, with multiple individual cells disposed between the first and second end plates. Multiple first mounting blocks are fixedly mounted on the periphery of the first end plate, and multiple second mounting blocks are fixedly mounted on the periphery of the second end plate. Each first mounting block has a connecting rod, one end of which is hinged to a screw. A limiting plate is fixedly mounted on the end of the connecting rod away from the screw. A nut is threaded onto the screw. The first mounting block has a first through hole for the connecting rod to pass through with damping. The limiting plate abuts against the side of the first mounting block away from the second mounting block. The second mounting block has a second through hole for the screw to pass through. A clearance opening is formed on the side of the second mounting block away from the second end plate, communicating with the second through hole. The clearance opening allows the screw to rotate into the second through hole.

[0008] By adopting the above technical solution, during the process of placing individual cells onto the first end plate, the connecting rod and screw pass through the first through hole, and the nut is screwed into the screw portion. Then, after the individual cells are stacked and the second end plate is pressed onto the individual cells, the screw is rotated, and the screw enters the second through hole through the clearance opening, thereby moving the nut to the side of the second end plate away from the first end plate. When the nut has moved to the side of the second end plate away from the first end plate, the nut is rotated again, so that the nut is tightly pressed against the second mounting block. By screwing the nut into the screw portion during the stacking of individual cells, the assembly speed of the battery stack is improved.

[0009] Optionally, the connecting rod has a hinge groove at one end near the screw, a hinge block is fixedly installed at one end of the screw, a shaft is provided inside the hinge groove, the end of the shaft is fixedly installed on the inner side wall of the hinge groove, and the shaft rotates through the hinge block.

[0010] By adopting the above technical solution, the shaft rotates inside the hinge groove, and the shaft drives the screw to rotate through the hinge block, thereby facilitating the movement of the screw from the clearance opening into the second through hole.

[0011] Optionally, a pressure block is fixedly installed on the side of the hinge block away from the screw, and a limit block is provided on the rod body of the connecting rod away from the single battery. The limit block is fixedly installed on the inner bottom wall of the hinge groove, and the limit block is used to limit the angle of rotation of the pressure block away from the second end plate.

[0012] By adopting the above technical solution, after the second end plate is placed on the single cell and pressed with a press, the second end plate moves toward the first end plate, and the second mounting block moves with the second end plate. Then, the second mounting block and the pressure block press against each other, causing the pressure block to rotate and enter the hinge groove. After the pressure block and the limiting block abut against each other, the screws are vertically positioned, facilitating the pushing of each screw from the clearance opening into the second through hole, thereby improving the assembly speed of the fuel cell stack.

[0013] Optionally, a first pressure groove is formed on the side of the first end plate away from the second end plate. The two ends of the first pressure groove extend to the first mounting block. The inner bottom wall of the first pressure groove is curved from the middle to both ends towards the second end plate. A first pressure band is provided inside the first pressure groove. A first rotating rod is provided inside both ends of the first pressure groove. The end of the first rotating rod is rotatably inserted into the inner side wall of the first pressure groove. The first pressure band passes between the first rotating rod and the bottom of the first pressure groove. A first tensioning component is installed at both ends of the first pressure band. The first tensioning component is used to pull the first pressure band.

[0014] By adopting the above technical solution, the first tensioning component tightens the first pressure belt, thereby causing the first pressure belt to press downward against the inner bottom wall of the first pressure groove. By pressing the inner bottom wall of the first pressure groove with the first pressure belt, the clamping force of the middle part of the first end plate on the single cell is increased, thereby reducing the occurrence of the middle part of the first end plate arching away from the second end plate.

[0015] Optionally, the first tensioning assembly includes a first slide rod, a first connecting block, and a first push block. The body of the first slide rod is fixedly connected to one end of the first pressure belt. The two inner sidewalls of the first pressure groove are provided with first sliding grooves for the first slide rod to slide through. The first connecting block is fixedly installed between the first slide rod and the first push block. The first push block abuts against the side of the first end plate away from the second end plate. One side of the first push block is inclined so that after the limiting plate is squeezed, the first push block moves away from the limiting plate.

[0016] By adopting the above technical solution, when the connecting rod is inserted into the first through hole and the limiting plate abuts against the side of the first mounting block away from the second mounting block, the limiting plate and the inclined side of the first push block are pressed against each other, thereby causing the first push block to move away from the limiting plate. When the first push block moves away from the limiting plate, the first push block tightens the first pull strap through the first slide rod, thereby facilitating the tightening of the first pull strap.

[0017] Optionally, a second pressure groove is provided on the side of the second end plate away from the first end plate. The two ends of the second pressure groove extend to the second mounting block. The inner bottom wall of the second pressure groove is curved from the middle to both ends, gradually approaching the first end plate. A second pressure band is provided inside the second pressure groove. A second rotating rod is provided inside both ends of the second pressure groove. The end of the second rotating rod is rotatably inserted into the inner side wall of the second pressure groove. The second pressure band passes between the second rotating rod and the bottom of the second pressure groove. A second tensioning component is installed at both ends of the second pressure band. The second tensioning component is used to pull the second pressure band.

[0018] By adopting the above technical solution, the second tensioning component tightens the second pressure belt, thereby causing the second pressure belt to press downward against the inner bottom wall of the second pressure groove. By pressing the inner bottom wall of the second pressure groove with the second pressure belt, the clamping force of the middle part of the second end plate on the single cell is increased, thereby reducing the occurrence of the middle part of the second end plate arching away from the first end plate.

[0019] Optionally, the first tensioning assembly includes a second slide rod, a second connecting block, and a second push block. The body of the second slide rod is fixedly connected to one end of the second pressure band. The two inner sidewalls of the second pressure groove are provided with second sliding grooves for the second slide rod to slide through. The second connecting block is fixedly installed between the second slide rod and the second push block. The second push block abuts against the side of the second end plate away from the first end plate. One side of the second push block is inclined so that after the nut is squeezed, the second push block moves away from the nut.

[0020] By adopting the above technical solution, as the screw enters the second through hole from the clearance opening and then the nut is rotated, causing the nut to abut against the side of the second mounting block away from the first mounting block, the nut and the inclined side of the second push block are pressed against each other, thereby causing the second push block to move away from the nut. When the second push block moves away from the nut, the second push block tightens the second pull band through the second slide rod, thus facilitating the tensioning of the second pull band.

[0021] Optionally, the side of the second mounting block away from the second end plate is inclined.

[0022] By adopting the above technical solution, when the screw rotates and enters the second through hole from the clearance opening, the tilt of the second mounting block is used to make clearance, thereby increasing the number of turns of the nut into the screw and thus improving the assembly speed of the fuel cell stack.

[0023] Optionally, the limiting plate is fixedly installed with a positioning rod, and the first mounting block has a positioning groove on the side away from the second mounting block for the positioning rod to pass through in a damping manner.

[0024] By adopting the above technical solution, when the limiting plate abuts against the side of the first mounting block away from the second mounting block, the positioning rod is inserted into the positioning groove, which facilitates the alignment of the screw with the clearance groove, and thus facilitates the screw to enter the second through hole from the clearance opening.

[0025] A method for assembling a fuel cell stack includes the following assembly steps:

[0026] Place the first end plate on the workbench and pass the screw and connecting rod through the first through hole;

[0027] The individual cells are stacked sequentially on the first end plate, and the nuts are screwed into the screws.

[0028] Place the second end plate on the single cell, press the second end plate tightly, and the screw enters the second through hole from the clearance opening;

[0029] Tighten the nut again until it is firmly against the second mounting block.

[0030] By adopting the above technical solution, the part of the work of screwing the nut into the screw is carried out during the process of stacking individual cells onto the first end plate, thereby improving the assembly speed of the stack.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By screwing the nut into the screw part during the process of stacking individual cells onto the first end plate, the time required to tighten the nut after the second end plate is pressed onto the individual cells is reduced, thereby improving the assembly speed of the fuel cell stack.

[0033] 2. The first tensioning assembly tightens the first pressure belt, which presses against the first end plate, thereby reducing the occurrence of the first end plate arching away from the individual battery and making the pressing force of the first end plate on the individual battery evenly distributed. Attached Figure Description

[0034] Figure 1 This is a first-view structural schematic diagram of an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the overall structure from a second perspective of an embodiment of this application;

[0036] Figure 3 This is an exploded view of the connecting rod and the first mounting block according to an embodiment of this application;

[0037] Figure 4 yes Figure 3 Enlarged view at point A;

[0038] Figure 5 This is an exploded view of the screw and the second mounting block according to an embodiment of this application;

[0039] Figure 6 This is an exploded view of the screw and connecting rod in an embodiment of this application;

[0040] Figure 7 This is a partial structural schematic diagram of an embodiment of this application;

[0041] Figure 8 yes Figure 7 Sectional view at AA;

[0042] Figure 9 yes Figure 8 Enlarged view at point B;

[0043] Figure 10 yes Figure 8 Enlarged view at point C.

[0044] Explanation of reference numerals in the attached drawings: 1. First end plate; 2. Second end plate; 3. Single cell; 4. First mounting block; 5. Second mounting block; 6. Connecting rod; 7. First through hole; 8. Second through hole; 9. Limiting plate; 10. Screw; 11. Nut; 12. Hinge block; 13. Shaft; 14. Hinge groove; 15. Clearance opening; 16. Pressure block; 17. Limiting block; 18. Positioning rod; 19. Positioning groove; 20. First pressure groove; 21. Second pressure groove; 22. First pressure band; 23. Second pressure band; 24. First rotating rod; 25. Second rotating rod; 26. First tensioning assembly; 261. First sliding rod; 262. First connecting block; 263. First push block; 27. Second tensioning assembly; 271. Second sliding rod; 272. Second connecting block; 273. Second push block; 28. First sliding groove; 29. ​​Second sliding groove; 30. Gasket. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0046] This application discloses an electric stack and its assembly method.

[0047] Reference Figure 1 , Figure 2 A fuel cell stack includes a first end plate 1 and a second end plate 2 disposed opposite to each other, with a plurality of individual cells 3 disposed between the first end plate 1 and the second end plate 2. A plurality of first mounting blocks 4 are fixedly mounted on the periphery of the first end plate 1, and a plurality of second mounting blocks 5 are fixedly mounted on the periphery of the second end plate 2.

[0048] Reference Figure 3 , Figure 4 The first mounting block 4 is provided with a connecting rod 6, and the first mounting block 4 has a first through hole 7 for the connecting rod 6 to pass through in a damped manner. A limiting plate 9 is fixedly installed at one end of the connecting rod 6. After the connecting rod 6 passes through the first through hole 7, the limiting plate 9 abuts against the side of the first mounting block 4 away from the second mounting block 5.

[0049] Reference Figure 5 , Figure 6 A screw 10 is provided at the end of the connecting rod 6 away from the limiting plate 9. A hinge groove 14 is provided at the end of the connecting rod 6 near the screw 10, and a hinge block 12 is fixedly installed at one end of the screw 10. A shaft 13 is provided inside the hinge groove 14, and the end of the shaft 13 is fixedly connected to the inner wall of the hinge groove 14. The shaft 13 rotates through the hinge block 12, thereby facilitating the rotation of the screw 10 around the shaft 13.

[0050] Reference Figure 5 , Figure 6The screw 10 is threaded with a nut 11, and the second mounting block 5 has a second through hole 8 for the screw 10 to pass through. After the screw 10 passes through the second through hole 8, the nut 11 is screwed into the screw 10, so that the nut 11 is pressed tightly against the side of the second mounting block 5 away from the first mounting block 4, thereby facilitating the first end plate 1 and the second end plate 2 to press each individual battery 3 together.

[0051] Reference Figure 5 , Figure 6 The second mounting block 5 has a clearance opening 15 on the side away from the second end plate 2, which communicates with the second through hole 8. After the screw 10 rotates upward about the shaft 13, it enters the second through hole 8 through the clearance opening 15. During the stacking of the individual cells 3 onto the first end plate 1, the nut 11 is screwed into the screw 10. Then, when the second end plate 2 is placed on top of the individual cells 3, the screw 10 rotates about the shaft 13, and it enters the second through hole 8 through the clearance opening 15, thereby reducing the chance of the nut 11 obstructing the placement of the second end plate 2 onto the individual cells 3. After the screw 10 enters the second through hole 8, the nut 11 is rotated to press the second mounting block 5. Because the nut 11 is screwed into the screw 10 when stacking the individual cells 3, the time spent rotating the nut 11 after placing the second end plate 2 onto the individual cells 3 is reduced, thus increasing the assembly speed of the battery stack.

[0052] Reference Figure 5 , Figure 6 The second mounting block 5 is inclined on the side away from the second end plate 2. When the screw 10 enters the second through hole 8 from the relief opening 15, the inclined side of the second mounting block 5 avoids the nut 11, thereby increasing the length of the nut 11 screwed into the screw 10 during the stacking of individual cells 3, and thus improving the assembly speed of the stack.

[0053] Reference Figure 6 , Figure 7A pressure block 16 is fixedly installed on the side of the hinge block 12 away from the screw 10. A limit block 17 is provided on the rod body of the connecting rod 6 away from the individual battery 3. The limit block 17 is fixedly installed on the inner bottom wall of the hinge groove 14 and is used to limit the angle of rotation of the pressure block 16 away from the second end plate 2. During the stacking of the individual batteries 3, the screw 10 is rotated away from the individual battery 3, the pressure block 16 moves out of the hinge groove 14, and the pressure block 16 moves closer to the individual battery 3. After the individual batteries 3 are stacked, when the second end plate 2 is placed on the individual battery 3, the second mounting block 5 presses the pressure block 16 downward, thereby causing the pressure block 16 to rotate back into the hinge groove 14. When the pressure block 16 rotates back into the hinge groove 14 and abuts against the limit block 17, the pressure block 16 drives the screw 10 to rotate through the shaft 13, and the screw 10 enters the second through hole 8 from the clearance opening 15, thereby reducing the time spent for each screw 10 to enter the second through hole 8 from the clearance opening 15, and thus improving the assembly speed of the fuel cell stack.

[0054] Reference Figure 4 , Figure 8 , Figure 9 The limiting plate 9 is fixedly installed with a positioning rod 18. The first mounting block 4 has a positioning groove 19 on the side away from the second mounting block 5 for the positioning rod 18 to pass through with damping. The positioning rod 18 is inserted into the positioning groove 19, which facilitates the alignment of the screw 10 with the clearance opening 15, and facilitates the screw 10 to enter the second through hole 8 from the clearance opening 15 after rotating upward.

[0055] Reference Figure 8 , Figure 9 A first pressing groove 20 is formed on the side of the first end plate 1 away from the second end plate 2. The two ends of the first pressing groove 20 extend to the first mounting block 4. The inner bottom wall of the first pressing groove 20 is curved from the middle to both ends, gradually approaching the second end plate 2. A first pressing band 22 is provided inside the first pressing groove 20. A first rotating rod 24 is provided inside both ends of the first pressing groove 20. The end of the first rotating rod 24 is rotatably inserted into the inner side wall of the first pressing groove 20.

[0056] Reference Figure 8 , Figure 9 The first pressure band 22 passes between the first rotating rod 24 and the bottom of the first pressure groove 20, and a first tensioning assembly 26 is installed at both ends of the first pressure band 22. The first tensioning assembly 26 tightens the two ends of the first pressure band 22, thereby pressing the inner bottom wall of the first pressure groove 20. By pressing the inner bottom wall of the first pressure groove 20 with the first pressure band 22, the clamping force on the middle part of the first end plate 1 is increased, thereby reducing the occurrence of the middle part of the first end plate 1 protruding away from the single cell 3. By pressing the middle part of the first end plate 1 with the first pressure band 22, the clamping force of the first end plate 1 on the single cell 3 is evenly distributed, thereby facilitating the tight contact of each single cell 3 with each other.

[0057] Reference Figure 8 , Figure 9 The first tensioning assembly 26 includes a first slide rod 261, a first connecting block 262, and a first push block 263. The body of the first slide rod 261 is fixedly connected to one end of the first pressure band 22, and the two inner sidewalls of the first pressure groove 20 are provided with first sliding grooves 28 for the first slide rod 261 to slide through. The first connecting block 262 is fixedly installed between the first slide rod 261 and the first push block 263, and the first push block 263 abuts against the side of the first end plate 1 away from the second end plate 2. One side of the first push block 263 is inclined so that after being pressed by the limiting plate 9, the first push block 263 moves away from the limiting plate 9.

[0058] Reference Figure 8 , Figure 9 After the connecting rod 6 passes through the first through hole 7, the limiting plate 9 is pushed against the side of the first mounting block 4 away from the second mounting block 5. During the process of pushing the limiting plate 9 against the first mounting block 4, the limiting plate 9 and the first push block 263 press against each other, causing the first push block 263 to move away from the limiting plate 9. As the first push block 263 moves away from the limiting plate 9, it pulls the first pressure band 22 via the first sliding rod 261, thus facilitating the tightening of the first pressure band 22.

[0059] At the same time, when the limiting plate 9 and the first push block 263 are pressed against each other, the limiting plate 9 will drive the connecting rod 6 to press tightly against the inner wall of the first through hole 7, thereby reducing the occurrence of the connecting rod 6 sliding out of the first through hole 7.

[0060] Reference Figure 8 , Figure 10 A second pressure groove 21 is provided on the side of the second end plate 2 away from the first end plate 1. The two ends of the second pressure groove 21 extend to the second mounting block 5. The inner bottom wall of the second pressure groove 21 is curved from the middle to both ends, gradually approaching the first end plate 1. A second pressure band 23 is provided inside the second pressure groove 21. A second rotating rod 25 is provided inside both ends of the second pressure groove 21. The end of the second rotating rod 25 is rotatably inserted into the inner side wall of the second pressure groove 21.

[0061] Reference Figure 8 , Figure 10The second pressure band 23 passes between the second rotating rod 25 and the bottom of the second pressure groove 21, and a second tensioning assembly 27 is installed at both ends of the second pressure band 23. The second tensioning assembly 27 tightens the two ends of the second pressure band 23, thereby pressing the bottom of the second pressure groove 21 against the second pressure band 23. By pressing the bottom of the second pressure groove 21 against the second pressure band 23, the clamping force on the middle of the second end plate 2 is increased, thereby reducing the occurrence of the middle of the second end plate 2 protruding away from the individual battery 3. By pressing the middle of the second end plate 2 with the second pressure band 23, the clamping force of the second end plate 2 on the individual battery 3 is evenly distributed, thereby facilitating the tight contact between each individual battery 3.

[0062] Reference Figure 8 , Figure 10 The second tensioning assembly 27 includes a second slide rod 271, a second connecting block 272, and a second push block 273. The body of the second slide rod 271 is fixedly connected to one end of the second pressure band 23. The two inner sidewalls of the second pressure groove 21 are provided with second sliding grooves 29 for the second slide rod 271 to slide through. The second connecting block 272 is fixedly installed between the second slide rod 271 and the second push block 273. The second push block 273 abuts against the side of the second end plate 2 away from the first end plate 1. One side of the second push block 273 is inclined so that after the nut 11 is pressed, the second push block 273 moves away from the nut 11.

[0063] Reference Figure 8 , Figure 10 After rotating the screw 10 into the second through hole 8 through the relief opening 15, and then tightening the nut 11 so that it presses tightly against the second mounting block 5, the nut 11 and the second push block 273 press against each other, thereby causing the second push block 273 to move away from the nut 11. As the second push block 273 moves away from the nut 11, it pulls the second pressure band 23 through the second slide rod 271, thus facilitating the tensioning of the second pressure band 23.

[0064] The screw 10 is fitted with a washer 30, which is located on the side of the nut 11 near the hinge block 12. Tightening the nut 11 causes the washer 30 to press against the second mounting block 5, thus reducing the likelihood of the nut 11 spinning on its own. Simultaneously, the nut 11 presses against the second push block 273 through the washer 30. The washer 30 is generally circular, while the nut 11 is generally hexagonal. The nut 11 presses against the second push block 273 through the washer 30, thereby reducing the likelihood of the reaction force exerted by the second push block 273 on the washer 30 causing the nut 11 to rotate.

[0065] An assembly method for a fuel cell stack, used to assemble a fuel cell stack according to an embodiment of this application, includes the following steps:

[0066] S1. Place the first end plate 1 on the workbench and pass the screw 10 and connecting rod 6 through the first through hole 7.

[0067] After the connecting rod 6 passes through the first through hole 7, the limiting plate 9 abuts against the side of the first mounting block 4 away from the second mounting block 5, and the positioning rod 18 is inserted into the positioning groove 19. When the limiting plate 9 abuts against the first mounting block 4, the limiting plate 9 will squeeze the first push block 263, and the first push block 263 will move away from the limiting plate 9, thereby tightening the first pressure band 22. When the limiting plate 9 and the first push block 263 squeeze each other, the limiting plate 9 will drive the rod body of the connecting rod 6 to press tightly against the inner wall of the first through hole 7, thereby reducing the possibility of the connecting rod 6 being pulled out of the first through hole 7 after moving downwards.

[0068] The positioning rod 18 is inserted into the positioning groove 19, which facilitates the alignment of the screw 10 with the clearance opening 15, and makes it easier for the screw 10 to enter the second through hole 8 from the clearance opening 15 when the screw 10 rotates around the shaft 13.

[0069] S2. Stack the individual cells 3 sequentially on the first end plate 1, and screw the nut 11 into the screw 10.

[0070] The screw 10 rotates around the shaft 13 and moves away from the individual battery 3. The screw 10 drives the pressure block 16 to rotate towards the individual battery 3 through the hinge block 12, and then stacks the individual battery 3 on the first end plate 1. During the process of stacking the individual battery 3 on the first end plate 1, the gasket 30 is inserted into the screw 10, and the nut 11 is screwed into part of the screw 10.

[0071] S3. Place the second end plate 2 on the single cell 3, press the second end plate 2 tightly, and the screw 10 enters the second through hole 8 from the clearance opening 15.

[0072] After the individual battery cell 3 is completed, the second end plate 2 is placed on top of the individual battery cell 3. Then, the press is started, and the press forces the second end plate 2 towards the first end plate 1. The second mounting block 5 moves with the second end plate 2, causing the second mounting block 5 and the pressure block 16 to press against each other. Through this mutual pressing, the pressure block 16 rotates downwards away from the individual battery cell 3, while the screw 10 rotates upwards towards the individual battery cell 3. When the pressure block 16 abuts against the limiting block 17, the screw 10 is in a vertical position, facilitating the rotation of each screw 10 together.

[0073] S4. Tighten nut 11 again so that nut 11 is pressed tightly against the second mounting block 5.

[0074] After the screw 10 enters the second through hole 8, the nut 11 is rotated to press tightly against the second mounting block 5. Since the nut 11 has already been screwed into the screw 10 in step S2, the time spent tightening the nut 11 in step S4 is reduced, thereby increasing the assembly speed of the fuel cell stack. At the same time, when tightening the nut 11, the nut 11 presses against the second push block 273 through the washer 30, causing the second push block 273 to move away from the nut 11, thereby tightening the first pressure band 22.

[0075] The implementation principle of the fuel cell stack and assembly method in this application embodiment is as follows: during the process of stacking individual cells 3 sequentially on the first end plate 1, the nut 11 is screwed into the screw 10 part in advance, thereby reducing the time spent on tightening the nut 11 again after the second end plate 2 is placed on the individual cells 3, thereby improving the assembly speed of the fuel cell stack.

[0076] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fuel cell stack, characterized in that: The system includes a first end plate (1) and a second end plate (2) arranged opposite to each other. Multiple individual battery cells (3) are disposed between the first end plate (1) and the second end plate (2). Multiple first mounting blocks (4) are fixedly installed on the periphery of the first end plate (1), and multiple second mounting blocks (5) are fixedly installed on the periphery of the second end plate (2). Each first mounting block (4) is provided with a connecting rod (6). One end of the connecting rod (6) is hinged to a screw (10). A limit plate (9) is fixedly installed on the end of the connecting rod (6) away from the screw (10). The screw (10)... A nut (11) is threaded onto the first mounting block (4), and a first through hole (7) is provided for the connecting rod (6) to pass through for damping. The limiting plate (9) abuts against the side of the first mounting block (4) away from the second mounting block (5). The second mounting block (5) is provided with a second through hole (8) for the screw (10) to pass through. A clearance opening (15) is provided on the side of the second mounting block (5) away from the second end plate (2). The clearance opening (15) communicates with the second through hole (8). The clearance opening (15) is used to allow the screw (10) to rotate into the second through hole (8). A first pressure groove (20) is provided on the side of the first end plate (1) away from the second end plate (2). The two ends of the first pressure groove (20) extend to the first mounting block (4). The inner bottom wall of the first pressure groove (20) is curved from the middle to the two ends, gradually approaching the second end plate (2). A first pressure band (22) is provided inside the first pressure groove (20). A first rotating rod (24) is provided inside both ends of the first pressure groove (20). The end of the first rotating rod (24) is rotatably inserted into the inner side wall of the first pressure groove (20). The first pressure band (22) passes between the first rotating rod (24) and the bottom of the first pressure groove (20). A first tensioning component (26) is installed at both ends of the first pressure band (22). The first tensioning component (26) is used to pull the first pressure band (22). The first tensioning assembly (26) includes a first slide rod (261), a first connecting block (262) and a first push block (263). The body of the first slide rod (261) is fixedly connected to one end of the first pressure band (22). The two inner sidewalls of the first pressure groove (20) are provided with a first sliding groove (28) for the first slide rod (261) to slide through. The first connecting block (262) is fixedly installed between the first slide rod (261) and the first push block (263). The first push block (263) abuts against the side of the first end plate (1) away from the second end plate (2). One side of the first push block (263) is inclined so that after the limiting plate (9) squeezes, the first push block (263) moves away from the limiting plate (9). The second end plate (2) has a second pressure groove (21) on the side away from the first end plate (1). The two ends of the second pressure groove (21) extend to the second mounting block (5). The inner bottom wall of the second pressure groove (21) is curved from the middle to the two ends, gradually approaching the first end plate (1). The second pressure groove (21) is provided with a second pressure band (23). The two ends of the second pressure groove (21) are provided with a second rotating rod (25). The end of the second rotating rod (25) is rotatably inserted into the inner side wall of the second pressure groove (21). The second pressure band (23) passes between the second rotating rod (25) and the bottom of the second pressure groove (21). The two ends of the second pressure band (23) are provided with a second tensioning component (27). The second tensioning component (27) is used to pull the second pressure band (23).

2. The fuel cell stack according to claim 1, characterized in that: The connecting rod (6) has a hinge groove (14) at one end near the screw (10). A hinge block (12) is fixedly installed at one end of the screw (10). A shaft (13) is provided inside the hinge groove (14). The end of the shaft (13) is fixedly installed on the inner wall of the hinge groove (14). The shaft (13) rotates through the hinge block (12).

3. A fuel cell stack according to claim 2, characterized in that: A pressure block (16) is fixedly installed on the side of the hinge block (12) away from the screw (10). A limit block (17) is provided on the rod body of the connecting rod (6) away from the single battery (3). The limit block (17) is fixedly installed on the inner bottom wall of the hinge groove (14). The limit block (17) is used to limit the angle of rotation of the pressure block (16) away from the second end plate (2).

4. A fuel cell stack according to claim 1, characterized in that: The second tensioning assembly (27) includes a second slide rod (271), a second connecting block (272), and a second push block (273). The body of the second slide rod (271) is fixedly connected to one end of the second pressure band (23). The two inner sidewalls of the second pressure groove (21) are provided with a second sliding groove (29) for the second slide rod (271) to slide through. The second connecting block (272) is fixedly installed between the second slide rod (271) and the second push block (273). The second push block (273) abuts against the side of the second end plate (2) away from the first end plate (1). One side of the second push block (273) is inclined so that after the nut (11) squeezes, the second push block (273) moves away from the nut (11).

5. A fuel cell stack according to claim 1, characterized in that: The second mounting block (5) is inclined on the side away from the second end plate (2).

6. A fuel cell stack according to claim 1, characterized in that: The limiting plate (9) is fixedly installed with a positioning rod (18), and the first mounting block (4) is provided with a positioning groove (19) on the side away from the second mounting block (5) for the positioning rod (18) to pass through in a damping manner.

7. A method for assembling a fuel cell stack, applied to a fuel cell stack according to any one of claims 1-6, characterized in that, The assembly process includes the following steps: Place the first end plate (1) on the workbench and pass the screw (10) and connecting rod (6) through the first through hole (7); Stack the individual cells (3) on the first end plate (1) in sequence, and screw the nut (11) into the screw (10); Place the second end plate (2) on the individual cells (3), press the second end plate (2) tightly, and let the screw (10) enter the second through hole (8) from the clearance opening (15); Tighten the nut (11) again so that the nut (11) is pressed tightly against the second mounting block (5).

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