A welding bipolar plate clamp

Abstract

The application discloses a welding bipolar plate clamp, which comprises a clamp base and a pressing plate, the clamp base is provided with a first groove for clamping a bipolar plate, the pressing plate is movably arranged in the first groove, two second grooves, which are in communication with the first groove, are symmetrically arranged on the clamp base, a receiving plate is arranged in each of the two second grooves, a driving device is arranged in the clamp base, a control knob is arranged on the clamp base, the control knob drives the receiving plate to move up and down through the driving device, the pressing plate is provided with an extension part corresponding to the receiving plate, the receiving plate is used for receiving the extension part and fixing the position of the pressing plate in the first groove, a first magnetic part and a second magnetic part are respectively arranged on the receiving plate and the extension part, the first magnetic part and the second magnetic part are attracted to each other, the relative positions of the first magnetic part and the second magnetic part are changed through the arrangement of the driving device and the receiving plate, and then the pressure adjustment of the pressing plate on the bipolar plate is realized, so that the pressure of the pressing plate on the bipolar plate can be effectively reduced, and the welding quality is improved.

Description

Technical Field

[0001] This application relates to the field of fixture technology, and more specifically to a welding bipolar plate fixture. Background Technology

[0002] As one of the important components of a fuel cell, the bipolar plate mainly plays the roles of gas distribution, electrical conduction, and heat conduction. The bipolar plate is generally formed by welding a cathode plate and an anode plate together. Because the bipolar plate itself is extremely thin (the thickness of the bipolar plate after processing is only a few millimeters), and the welding quality of the bipolar plate is very demanding, special fixtures are required for clamping and welding.

[0003] Existing bipolar plate clamps typically use grooves to support the bipolar plates, and then use magnetic adsorption pressure plates to fix the bipolar plates in the grooves to achieve the clamping effect. However, this method causes the pressure plates to exert significant pressure on the bipolar plates under magnetic adsorption. Furthermore, the weld lines from laser welding are close to the edge of the pressure plates, which can affect the welding process during subsequent laser welding, thus impacting the welding quality. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a welding bipolar plate fixture that can reduce the pressure of the pressure plate, thereby reducing the impact of the pressure plate on welding and improving the welding quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding bipolar plate clamp, comprising a clamping base and a pressure plate. The clamping base is provided with a first groove for engaging the bipolar plate. The pressure plate is movably mounted in the first groove and is used to press against the upper surface of the bipolar plate. The clamping base is symmetrically provided with two second grooves communicating with the first groove. Each of the two second grooves is provided with a receiving plate. The clamping base is provided with a driving device. The clamping base is provided with a control knob. The driving device is connected to the receiving plate and the control knob respectively. The control knob drives the receiving plate to move up and down through the driving device. The pressure plate is provided with an extension corresponding to the receiving plate. The receiving plate is used to receive the extension and fix the position of the pressure plate in the first groove. The receiving plate and the extension are respectively provided with a first magnetic element and a second magnetic element, which attract each other.

[0006] By adopting the above technical solution, the receiving plate can support the pressure plate, and the pressure of the pressure plate can be adjusted by controlling the position of the pressure plate relative to the receiving plate and cooperating with the magnetic components. At the same time, the receiving plate can be moved to fit against the pressure plate to achieve the minimum pressure of the pressure plate on the bipolar plate.

[0007] Optionally, the driving device includes a driving gear and a driven gear. The control knob is provided with a connecting rod and is connected to the driving gear through the connecting rod. The driven gear meshes with the driving gear. A longitudinally arranged screw is provided in the second groove. One end of the screw passes through the receiving plate and is connected to the driven gear. The receiving plate is rotatably connected to the screw. The outer side of the receiving plate abuts against the inner wall of the second groove.

[0008] By adopting the above technical solution, the transmission through gears can be made more stable, and the screw setting can achieve a higher transmission ratio to improve the adjustment accuracy.

[0009] Optionally, the ratio of the number of teeth of the driving gear to the number of teeth of the driven gear is less than 0.5.

[0010] By adopting the above technical solution, a higher transmission ratio can be achieved, thereby improving the adjustment accuracy.

[0011] Optionally, the pressure plate is provided with a pressure sensor corresponding to the first groove, and the upper surface of the pressure plate is provided with a display screen, which is used to display the pressure sensed by the pressure sensor.

[0012] By adopting the above technical solution, the pressure of the pressure sensor can be displayed in real time on the screen, which makes it convenient for operators to adjust the position of the pressure plate.

[0013] Optionally, the pressure plate forms an installation cavity, and the installation cavity is provided with multiple contour plates. A gap is formed between the contour plates and the installation cavity, and the gap corresponds to the laser welding line. It also includes a first rod and a second rod, both of which are telescopic rods. The inner wall of the installation cavity is provided with two vertically arranged sliding grooves, and each of the two sliding grooves is provided with a displacement component. One end of the first rod and the second rod is connected to the displacement component, and the displacement component is used to drive the first rod and the second rod to slide along the length direction of the sliding groove. The end of the first rod and the second rod away from the displacement component is rotatably connected to the contour plate.

[0014] By adopting the above technical solution, the welding of the closed circuit can be achieved by moving the first rod and the second rod, so as to meet the welding requirements of bipolar plates.

[0015] Optionally, the displacement assembly includes a linkage gear and two pulleys. The two pulleys are symmetrically arranged in the sliding groove and connected to each other by a transmission belt. The linkage gear is coaxially and fixedly connected to the pulleys. A connecting block is provided on the transmission belt. The connecting block is rotatably connected to one end of the first rod or the second rod. The drive motor is mounted on the pressure plate. The output end of the drive motor is provided with a connecting mechanism and is connected to the linkage gear through the connecting mechanism. The drive motor is used to drive the linkage gear to rotate.

[0016] By adopting the above technical solution, the first rod and the second rod can move sequentially, thereby keeping the position of the copying plate unchanged.

[0017] Optionally, the connecting mechanism includes two irregularly shaped gears corresponding to the two linkage gears. The outer surface of the irregularly shaped gears forms a meshing area and a free-spinning area. The two irregularly shaped gears are staggered in their meshing areas and free-spinning areas. Teeth are formed on the meshing area for meshing with the linkage gears.

[0018] By adopting the above technical solution, a single driving source can drive the first rod and the second rod to move sequentially, making the overall structure simpler.

[0019] Optionally, the contour plate is provided with a connecting part, which is used to rotatably connect the first rod and the second rod respectively. The connecting part is provided with a fixing member corresponding to the first rod and the second rod respectively, and the fixing member is used to restrict the rotation of the first rod and the second rod relative to the connecting part.

[0020] By adopting the above technical solution, the fixing component can keep the position of the profile plate unchanged during the sequential movement of the first rod and the second rod, thereby improving the accuracy of the cutting path.

[0021] Optionally, the fixing component is a ball bearing, and the connecting part is provided with two annular grooves arranged vertically. One end of the first rod and the second rod are each formed into a sleeve end and respectively sleeved into the two annular grooves. The side of the two sleeve ends that are close to each other is a limiting surface. Multiple slots are provided circumferentially along the rotation axis of the sleeve end on the limiting surface. The connecting part is provided with a longitudinally arranged through hole corresponding to the slot. The ball bearing is movably installed in the lower slot. The slot is provided with a guide slope corresponding to the rotation direction of the sleeve end. The through hole is used to accommodate part of the ball bearing and restrict the ball bearing to move only up and down. The ball bearing is used to restrict the rotation of the sleeve end relative to the connecting part. The guide slope is used to guide the ball bearing to pass through the through hole and engage with the upper corresponding slot.

[0022] By adopting the above technical solution, the connection angle between the first rod and the connecting part is locked during the movement of the second rod by using a rolling ball. At the same time, the control method of the rolling ball makes the overall structure more compact and adaptable to the needs of laser cutting.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up the driving device and the receiving plate, the relative positions of the first magnetic component and the second magnetic component are changed, thereby adjusting the pressure of the pressure plate on the bipolar plate, which can effectively reduce the pressure of the pressure plate on the bipolar plate and improve the welding quality.

[0025] 2. The angle of the pressure plate can be finely adjusted by the symmetrically arranged receiving plates, thereby increasing the contact range of the pressure plate with the bipolar plate and thus improving the pressure plate's ability to press the bipolar plate;

[0026] 3. The first and second poles in the activity setup can achieve the welding of the closed circuit. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall invention;

[0028] Figure 2 This is a schematic cross-sectional view of the drive device of the present invention.

[0029] Figure 3 This is a schematic diagram of the installation of the first and second rods of the present invention;

[0030] Figure 4 This is a schematic diagram of the installation of the displacement component of the present invention;

[0031] Figure 5 This is a schematic cross-sectional view of the connection part of the present invention.

[0032] Figure 6 This is a schematic diagram of the socket end of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection part of the present invention.

[0034] Reference numerals: 1. Clamp; 2. Pressure plate; 3. First groove; 4. Second groove; 5. Receiving plate; 6. Drive device; 7. Control knob; 8. Extension; 9. First magnetic component; 10. Second magnetic component; 11. Drive gear; 12. Driven gear; 13. Connecting rod; 14. Screw; 15. Pressure sensor; 16. Contouring plate; 17. Gap; 18. First rod; 19. Second rod; 20. Sliding. 21. Groove; 22. Displacement assembly; 23. Linkage gear; 24. Pulley; 25. Transmission belt; 26. Connecting block; 27. Special-shaped gear; 28. Meshing area; 29. ​​Idle area; 30. Drive motor; 31. Display screen; 32. Mounting cavity; 33. Connecting part; 34. Fixing component; 35. Ball; 36. Annular groove; 37. Sleeve end; 38. Limiting surface; 39. Through hole; 40. Guide slope; 41. Slot. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0036] Reference Figure 1-2A welding bipolar plate fixture includes a clamping base 1 and a pressure plate 2. The clamping base 1 has a first groove 3 for engaging the bipolar plate. The pressure plate 2 is movably installed in the first groove 3 and is used to press against the upper surface of the bipolar plate. The clamping base 1 has two symmetrically arranged second grooves 4 communicating with the first groove 3. Each of the two second grooves 4 has a receiving plate 5. The clamping base 1 has a driving device 6 and a control knob 7. The driving device 6 is connected to the receiving plate 5 and the control knob 7 respectively. The control knob 7 drives the receiving plate 5 to move up and down through the driving device 6. The pressure plate 2 has an extension 8 corresponding to the receiving plate 5. The receiving plate 5 is used to receive the extension 8 and fix the position of the pressure plate 2 in the first groove 3. Since the first groove 3 is a groove, the flatness accuracy of its groove is often not high during processing. Therefore, the symmetrically arranged receiving plates 5 can fix the pressure plate 2. The angle is finely adjusted to ensure that the pressure plate 2 presses against the bipolar plate. The receiving plate 5 and the extension 8 are respectively provided with a first magnetic element 9 and a second magnetic element 10. The first magnetic element 9 and the second magnetic element 10 attract each other. In use, the bipolar plate is placed in the first groove 3, and then the pressure plate 2 is placed in the first groove 3, while the extension 8 is located in the second groove 4. The control knob 7 is rotated, and the receiving plate 5 is driven up and down by the driving device 6. The pressure of the pressure plate 2 on the bipolar plate is adjusted by the relative position change of the first magnetic element 9 and the second magnetic element 10. At the same time, after the bipolar plate is placed, the position of the receiving plate 5 can be pre-adjusted so that the position of the receiving plate 5 is aligned with the bipolar plate. Then, after the pressure plate 2 is placed, the lower end face of the pressure plate 2 is only in contact with the bipolar plate, thereby minimizing the pressure of the pressure plate 2 on the bipolar plate.

[0037] Reference Figure 2 The driving device 6 includes a driving gear 11 and a driven gear 12. A connecting rod 13 is provided on the control knob 7 and is connected to the driving gear 11 through the connecting rod 13. The driven gear 12 is set in the second groove 4 and meshes with the driving gear 11. A longitudinally arranged screw 14 is provided in the second groove 4. One end of the screw 14 passes through the receiving plate 5 and is connected to the driven gear 12. The receiving plate 5 is rotatably connected to the screw 14. The outer side of the receiving plate 5 abuts against the inner wall of the second groove 4, thereby restricting the rotation of the receiving plate 5. In use, rotating the control knob 7 further drives the driving gear 11 to rotate, which in turn drives the screw 14 to rotate through the driven gear 12. Since the outer side of the receiving plate 5 abuts against the inner wall of the second groove 4, the receiving plate 5 will move up and down along the inner wall of the second groove 4. In order to improve the adjustment accuracy and meet the requirement of adjusting the receiving plate 5 to align with the bipolar plate, it is further preferred that the gear ratio of the driving gear 11 and the driven gear 12 is less than 0.5, thereby achieving a high transmission ratio with the screw 14 and thus improving the adjustment accuracy.

[0038] Reference Figure 1-2The pressure plate 2 is equipped with a pressure sensor 15 corresponding to the first groove 3. The upper surface of the pressure plate 2 is equipped with a display screen 30, which is used to display the pressure sensed by the pressure sensor 15. By setting the pressure sensor 15, the position of the receiving plate 5 can be adjusted by observing the value of the pressure sensor 15. For example, when the receiving plate 5 is separated from the pressure plate 2, the value of the pressure sensor 15 changes uniformly. When the receiving plate 5 moves up and connects with the pressure plate 2, the value of the pressure sensor 15 will increase and suddenly become 0, which makes it easier for the user to judge the pressing condition of the pressure plate 2 on the bipolar plate.

[0039] Reference Figure 3Since multiple areas need to be welded on the bipolar plate after the double-layer outer ring welding is completed to form different functional areas, and since these functional areas are mostly closed weld lines, the bipolar plate needs to be repeatedly re-clamped and welded, which is very inconvenient. Therefore, in this embodiment, a mounting cavity 31 is formed on the pressure plate 2, and multiple contour plates 16 are provided in the mounting cavity 31. The shape of the contour plates 16 corresponds to the shape of the functional areas of the bipolar plate. A gap 17 is formed between the contour plates 16 and the mounting cavity 31, and the gap 17 corresponds to the laser welding line. It also includes a first rod 18 and a second rod 19. All rods 19 are telescopic rods. The telescopic design reduces the impact of the movement of the first rod 18 and the second rod 19 on the position of the contour plate 16. The inner wall of the mounting cavity 31 has two vertically arranged sliding grooves 20. The first rod 18 and the second rod 19 are vertically arranged and correspond to the two sliding grooves 20 respectively. Each sliding groove 20 contains a displacement assembly 21. One end of the first rod 18 and the second rod 19 is connected to the displacement assembly 21. The displacement assembly 21 is used to drive the first rod 18 and the second rod 19 to slide along the length of the sliding groove 20. The first rod 18 and the second rod 19 are far... One end of the displacement component 21 is rotatably connected to the contour plate 16. During use, after the pressure plate 2 is installed, the contour plate 16 is positioned corresponding to the bipolar plate functional area, simultaneously aligning the gap 17 with the laser welding line. Welding then proceeds along the laser welding line. When the laser welds a certain distance along the path, the displacement component 21 drives the second rod 19 to move towards the already welded welding line. At this time, the first rod 18 is fixed. Therefore, when the second rod 19 moves, the position of the contour plate 16 itself does not change. After the second rod 19 has moved, the displacement component 21 drives the first rod 18 towards the direction of the already welded welding line. The second rod 19 moves to a fixed position. After the first rod 18 moves, the weld lines at the corresponding positions of the first rod 18 and the second rod 19 are exposed and can be welded by laser. The welding of the closed weld lines is achieved by the displacement component 21, the first rod 18 and the second rod 19, and the connection area is not affected by the inability to weld some areas. At the same time, the first rod 18 and the second rod 19 can keep the contour plate 16 fixed during a single movement, and prevent the contour plate 16 from shifting as the first rod 18 or the second rod 19 moves.

[0040] Reference Figure 4The displacement assembly 21 includes a linkage gear 22 and two pulleys 23. The two pulleys 23 are symmetrically arranged in the sliding groove 20 and connected to each other by a transmission belt 24. The linkage gear 22 is coaxially fixedly connected to the pulleys 23. A connecting block 25 is provided on the transmission belt 24. The connecting block 25 is rotatably connected to one end of the first rod 18 or the second rod 19. The drive motor 29 is mounted on the pressure plate 2. The output end of the drive motor 29 is provided with a connecting mechanism and is connected to the linkage gear 22 through the connecting mechanism. The drive motor 29 is used to drive the linkage gear 22 to rotate. The connecting mechanism includes two irregularly shaped gears 26 corresponding to the two linkage gears 22. The outer surface of the irregularly shaped gears 26 forms a meshing area 27 and a free-spinning area 28. The two irregularly shaped gears 26 are staggered in the meshing area 27 and the free-spinning area 28 respectively. Teeth are formed on the meshing area 27. Used to mesh with the linkage gear 22, in the initial state, the lower irregular gear 26 meshes with the lower linkage gear 22 through the teeth on its meshing area 27. At this time, the drive motor 29 drives the two irregular gears 26 to rotate, and the lower irregular gear 26 drives the corresponding linkage gear 22 to rotate. It further moves through the two drive belts 24, and further drives the connecting block 25 to move, thereby realizing the movement effect of the second rod 19. Further, the lower irregular gear 26 rotates to the idle area 28. At this time, the irregular gear 26 separates from the linkage gear 22, and the position of the first rod 18 is fixed. At the same time, the upper irregular gear 26 meshes with the upper linkage gear 22 and drives the first rod 18 to move, thereby realizing the individual movement effect of the first rod 18 and the second rod 19.

[0041] Reference Figure 5 , Figure 6 and Figure 7The contour plate 16 is provided with a connecting part 32, which is columnar. The connecting part 32 is used to rotatably connect the first rod 18 and the second rod 19 respectively. The connecting part 32 is provided with a fixing member 33 corresponding to the first rod 18 and the second rod 19 respectively. The fixing member 33 is used to restrict the rotation of the first rod 18 and the second rod 19 relative to the connecting part 32. The fixing member 33 is a ball 34. The connecting part 32 is provided with two annular grooves 35 arranged vertically. One end of the first rod 18 and the second rod 19 are both formed into a sleeve end 36 and respectively sleeved into the two annular grooves 35, so that the first rod 18 and the second rod 19... The two rods 19 can rotate relative to the connecting part 32. The side of the two sleeve ends 36 that is close to each other is a limiting surface 37. The limiting surface 37 is provided with a plurality of slots 40 circumferentially along the rotation axis of the sleeve ends 36. The connecting part 32 is provided with a longitudinally arranged through hole 38 corresponding to the slot 40. The through hole 38 is provided corresponding to the slot 40. The ball 34 is movably installed in the slot 40 corresponding to the lower sleeve end 36. The slot 40 is provided with a guide slope 39 corresponding to the rotation direction of the sleeve end 36. The through hole 38 is used to accommodate part of the ball 34 and restrict the ball 34 to move only up and down. The ball 34 is used to restrict the sleeve. The connecting end 36 rotates relative to the connecting part 32. The guide slope 39 guides the ball 34 through the through hole 38 and engages with the corresponding upper slot 40. In the initial state, the two connecting ends 36 are aligned with the slots 40 and the through hole 38, so that the ball 34 is respectively housed in the through hole 38 and the corresponding lower slot 40. When the displacement component 21 moves the second rod 19, the connecting end 36 rotates relative to the connecting part 32 and guides the ball 34 upward through the guide slope 39, so that the ball 34 leaves the lower slot 40 and engages with the upper slot 40. This ensures a fixed connection between the upper sleeve end 36 and the connecting part 32, meaning the angle between the sleeve end 36 and the connecting part 32 cannot be adjusted. This prevents the contour plate 16 from shifting due to the movement of the second rod 19. After the second rod 19 has moved, the ball 34 falls back into the lower slot 40. At the same time, the first rod 18 rotates relative to the connecting part 32 with the corresponding sleeve end 36. The ball 34 ensures a fixed connection between the second rod 19 and the corresponding sleeve end 36 and the connecting part 32, thus preventing the contour plate 16 from shifting due to the movement of the first rod 18.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding bipolar plate fixture, characterized in that: Includes a clamp (1) and a pressure plate (2). The clamp (1) has a first groove (3) for engaging bipolar plates. The pressure plate (2) is movably installed in the first groove (3) and is used to press against the upper surface of the bipolar plate. The clamp (1) has two symmetrical second grooves (4) communicating with the first groove (3). Each of the two second grooves (4) has a receiving plate (5). The clamp (1) has a driving device (6). The clamp (1) has a control knob (7). The driving device (6) is divided into... The receiving plate (5) and the control knob (7) are connected separately. The control knob (7) drives the receiving plate (5) to move up and down through the driving device (6). The pressure plate (2) is provided with an extension (8) corresponding to the receiving plate (5). The receiving plate (5) is used to receive the extension (8) and fix the position of the pressure plate (2) in the first groove (3). The receiving plate (5) and the extension (8) are respectively provided with a first magnetic element (9) and a second magnetic element (10). The first magnetic element (9) and the second magnetic element (10) attract each other. An installation cavity (31) is formed on the pressure plate (2). Multiple contour plates (16) are provided in the installation cavity (31). A gap (17) is formed between the contour plates (16) and the installation cavity (31). The gap (17) corresponds to the laser welding line. It also includes a first rod (18) and a second rod (19). The first rod (18) and the second rod (19) are both telescopic rods. The inner wall of the installation cavity (31) is provided with two sliding grooves (20) arranged vertically. A displacement component (21) is provided in each of the two sliding grooves (20). One end of the first rod (18) and the second rod (19) is connected to the displacement component (21). The displacement component (21) is used to drive the first rod (18) and the second rod (19) to slide along the length direction of the sliding groove (20). The end of the first rod (18) and the second rod (19) away from the displacement component (21) is rotatably connected to the contour plate (16).

2. The welding bipolar plate fixture according to claim 1, characterized in that: The drive device (6) includes a drive gear (11) and a driven gear (12). The control knob (7) is provided with a connecting rod (13) and is connected to the drive gear (11) through the connecting rod (13). The driven gear (12) meshes with the drive gear (11). The second groove (4) is provided with a longitudinally arranged screw (14). One end of the screw (14) passes through the receiving plate (5) and is connected to the driven gear (12). The receiving plate (5) is rotatably connected to the screw (14). The outer side of the receiving plate (5) abuts against the inner wall of the second groove (4).

3. A welding bipolar plate fixture according to claim 2, characterized in that: The ratio of the number of teeth of the driving gear (11) and the driven gear (12) is less than 0.

5.

4. A welding bipolar plate fixture according to claim 1, characterized in that: The pressure plate (2) is provided with a pressure sensor (15) corresponding to the first groove (3), and the upper surface of the pressure plate (2) is provided with a display screen (30), which is used to display the pressure sensed by the pressure sensor (15).

5. A welding bipolar plate fixture according to claim 1, characterized in that: The displacement component (21) includes a linkage gear (22) and two pulleys (23). The two pulleys (23) are symmetrically arranged in the sliding groove (20) and connected to each other by a transmission belt (24). The linkage gear (22) is coaxially fixedly connected to the pulleys (23). A connecting block (25) is provided on the transmission belt (24). The connecting block (25) is rotatably connected to one end of the first rod (18) or the second rod (19). A drive motor (29) is installed on the pressure plate (2). The output end of the drive motor (29) is provided with a connecting mechanism and is connected to the linkage gear (22) through the connecting mechanism. The drive motor (29) is used to drive the linkage gear (22) to rotate.

6. A welding bipolar plate fixture according to claim 5, characterized in that: The connecting mechanism includes two irregular gears (26) corresponding to two linkage gears (22). The outer surface of the irregular gears (26) forms a meshing area (27) and a free-spinning area (28). The two irregular gears (26) are staggered in the meshing area (27) and free-spinning area (28) respectively. Teeth are formed on the meshing area (27) for meshing with the linkage gears (22).

7. A welding bipolar plate fixture according to claim 1, characterized in that: The contour plate is provided with a connecting part, which is used to rotatably connect the first rod and the second rod respectively. The connecting part is provided with a fixing member corresponding to the first rod and the second rod respectively, and the fixing member is used to restrict the rotation of the first rod and the second rod relative to the connecting part.

8. A welding bipolar plate fixture according to claim 7, characterized in that: The fixing component is a ball bearing. The connecting part has two annular grooves arranged vertically. One end of the first rod and the second rod each form a sleeve end and respectively sleeves the two annular grooves. The side of the two sleeve ends that are close to each other is a limiting surface. Multiple slots are provided circumferentially on the limiting surface along the rotation axis of the sleeve end. The connecting part has a longitudinally arranged through hole corresponding to the slot. The ball bearing is movably installed in the lower slot. The slot has a guide slope corresponding to the rotation direction of the sleeve end. The through hole is used to accommodate part of the ball bearing and restrict the ball bearing to move only up and down. The ball bearing is used to restrict the rotation of the sleeve end relative to the connecting part. The guide slope is used to guide the ball bearing through the through hole and engage with the upper corresponding slot.

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