A welding jig for a fuel cell metal bipolar plate

Abstract

The utility model provides a kind of welding fixture of fuel cell metal bipolar plate, including disk base, outer frame pressing plate, inner cavity pressing plate, gas port pressing plate;Disk base includes corresponding outer frame with outer frame pressing plate, corresponding inner cavity with inner cavity pressing plate, corresponding gas port with gas port pressing plate;Outer frame is equipped with outer frame protruding rib on its inner periphery edge, inner cavity is equipped with inner cavity protruding rib on its outer edge, gas port is equipped with gas port protruding rib on its outer edge;Outer frame pressing plate is equipped with corresponding outer frame pressing plate protruding rib with outer frame protruding rib on its side towards outer frame, inner cavity pressing plate is equipped with corresponding inner cavity pressing plate protruding rib with inner cavity protruding rib on its side towards inner cavity, gas port pressing plate is equipped with corresponding gas port pressing plate protruding rib with gas port protruding rib on its side towards gas port;Thus, metal bipolar plate is clamped by outer frame protruding rib, inner cavity protruding rib, gas port protruding rib and outer frame pressing plate protruding rib, inner cavity pressing plate protruding rib, gas port pressing plate protruding rib;To form more compact and reliable clamping.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to a welding fixture for metal bipolar plates of fuel cells. Background Technology

[0002] In the manufacturing process of metal bipolar plates, the bonding of the cathode plate and the anode plate is usually accomplished by laser welding. The two monopolar plates are bonded together to form a flow field of three different media. Due to the high temperature generated during welding, the metal plate is deformed. Moreover, the monopolar plates already have slight deformation and internal stress after stretching during the stretching process. As a result, the two monopolar plates are not bonded tightly in some areas during the welding process. The high temperature during welding process causes the metal material to deform, resulting in a low sealing qualification rate and poor plate flatness after metal bipolar welding.

[0003] Secondly, before welding the two monopolar plates of a metal bipolar plate, the two monopolar plates must be precisely positioned and tightly fitted. This is because the fine flow channels of the metal bipolar plate (such as serpentine or mesh channels) result in a very small contact area between the two monopolar plates. Inaccurate positioning of the two monopolar plates can lead to defects such as incomplete welds or poor soldering. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a welding fixture for fuel cell metal bipolar plates that can achieve precise positioning, quick loading and unloading, and ensure that the two single metal plates are tightly attached during welding.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A welding fixture for a metal bipolar plate of a fuel cell includes a disk base, an outer frame pressure plate, an inner cavity pressure plate, and a gas port pressure plate. The disk base includes an outer frame corresponding to the outer frame pressure plate, an inner cavity corresponding to the inner cavity pressure plate, and a gas port corresponding to the gas port pressure plate. The inner peripheral edge of the outer frame is provided with an outer frame protrusion rib, the outer edge of the inner cavity is provided with an inner cavity protrusion rib, and the outer edge of the gas port is provided with a gas port protrusion rib. The outer frame pressure plate has an outer frame pressure plate protrusion rib corresponding to the outer frame protrusion rib on its side facing the outer frame, the inner cavity pressure plate has an inner cavity pressure plate protrusion rib corresponding to the inner cavity protrusion rib on its side facing the inner cavity, and the gas port pressure plate has a gas port pressure plate protrusion rib corresponding to the gas port protrusion rib on its side facing the gas port.

[0007] In one embodiment, a first welding path is formed between the inner periphery of the outer frame pressure plate and the outer edge of the inner cavity pressure plate and the outer edge of the air port pressure plate, and a second welding path is formed between the outer edge of the inner cavity pressure plate and the outer edge of the air port pressure plate.

[0008] In one embodiment, a first clearance groove is provided between the inner periphery of the outer frame and the outer edge of the inner cavity and the outer edge of the air port, and a second clearance groove is provided between the outer edge of the air port and the outer edge of the inner cavity.

[0009] In one embodiment, the first welding path is connected to the second welding path.

[0010] In one embodiment, the first venting groove is connected to the second venting groove.

[0011] In one embodiment, the first clearance groove is located below the first welding path; the second clearance groove is located below the second welding path.

[0012] In one embodiment, the outer frame is provided with a groove that matches the protrusion of the monopolar plate.

[0013] In one embodiment, positioning pins are provided on all four sides of the outer frame, and positioning holes matching the positioning pins are provided on the outer frame pressure plate.

[0014] In one embodiment, both ends of the inner cavity are provided with inner cavity positioning pins, and the inner cavity pressure plate is provided with inner cavity positioning holes that match the inner cavity positioning pins.

[0015] In one embodiment, the disk base is provided with a magnetic switch.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model comprises a disk base, an outer frame pressure plate, an inner cavity pressure plate, and an air vent pressure plate. The disk base includes an outer frame corresponding to the outer frame pressure plate, an inner cavity corresponding to the inner cavity pressure plate, and an air vent corresponding to the air vent pressure plate. The inner peripheral edge of the outer frame has raised ribs, the outer edge of the inner cavity has raised ribs, and the outer edge of the air vent has raised ribs. The outer frame pressure plate has raised ribs corresponding to the raised ribs on its side facing the outer frame, and the inner cavity pressure plate has raised ribs facing the outer frame pressure plate. One side of the inner cavity is provided with an inner cavity pressure plate protrusion corresponding to the inner cavity protrusion rib, and the side of the air port pressure plate facing the air port is provided with an air port pressure plate protrusion corresponding to the air port protrusion rib; thereby, the metal bipolar plate is clamped by the outer frame protrusion rib, the inner cavity protrusion rib, the air port protrusion rib, the outer frame pressure plate protrusion rib, the inner cavity pressure plate protrusion rib, and the air port pressure plate protrusion rib; thus forming a tighter and more reliable clamping, while also increasing the contact surface between the bipolar plate and the air, better and faster dissipating the heat generated by welding, reducing welding deformation, and improving the welding qualification rate. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0019] Figure 2 This utility model Figure 1 A top view of the outer frame pressure plate, inner cavity pressure plate, and air inlet pressure plate;

[0020] Figure 3 This utility model Figure 1 A bottom view of the outer frame pressure plate, inner cavity pressure plate, and air inlet pressure plate;

[0021] Figure 4 This utility model Figure 3 Enlarged structural diagram of section A in the middle;

[0022] Figure 5 This utility model Figure 1 A top view of the disk dock's structure;

[0023] Figure 6 This utility model Figure 5 Enlarged structural diagram of section B.

[0024] In the diagram: 10. Disk base, 11. Outer frame, 12. Inner cavity, 13. Air vent, 14. First clearance groove, 15. Second clearance groove, 16. Outer frame protrusion rib, 17. Inner cavity protrusion rib, 18. Air vent protrusion rib, 19. Groove, 20. Outer frame pressure plate, 21. Outer frame pressure plate protrusion rib, 25. Positioning pin, 26. Positioning hole, 30. Inner cavity pressure plate, 31. Inner cavity pressure plate protrusion rib, 35. Inner cavity positioning pin, 36. Inner cavity positioning hole, 40. Air vent pressure plate, 41. Air vent pressure plate protrusion rib, 50. First welding path, 60. Second welding path. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figures 1-6 As shown, this embodiment includes a disk base 10, an outer frame pressure plate 20, an inner cavity pressure plate 30, and an air vent pressure plate 40. In this embodiment, the disk base 10 is provided with a mold surface that is the same as the mold surface of the lower mold of the metal bipolar plate, so as to ensure that the metal bipolar plate and the disk base 10 can be completely fitted together, thereby forming a sufficiently reliable support.

[0028] The disk base includes an outer frame 11, an inner cavity 12, and air ports 13. In this embodiment, there are four air ports 13, located on the upper and lower sides of both ends of the inner cavity 12. There are also four air port pressure plates 40, located on the upper and lower sides of both ends of the inner cavity pressure plate 30.

[0029] A first clearance groove 14 is provided between the inner periphery of the outer frame 11 and the outer edge of the inner cavity 12 and the outer edge of the air port 13, and a second clearance groove 15 is provided between the outer edge of the air port 13 and the outer edge of the inner cavity 12, and the first clearance groove 14 and the second clearance groove 15 are connected; thereby preventing the product from being welded together with the base during the welding process and also being able to accommodate welding slag.

[0030] The outer frame 11 is provided with grooves 19 that match the protrusions of the monopolar plate; in this embodiment, the outer frame 11 is provided with a number of grooves 19, so that the metal bipolar plate can be precisely positioned and installed on the disk base 10 by fitting its own flow channel with the grooves 19 on the outer frame 11.

[0031] Positioning pins 25 are provided on all four sides of the outer frame 11, and inner cavity positioning pins 35 are provided at both ends of the inner cavity 12. Thus, the outer frame 11, inner cavity 12, air port 13, first clearance groove 14, second clearance groove 15, groove 19, positioning pins 25, and inner cavity positioning pins 35 constitute a mold surface that matches the metal bipolar plate, so that the metal bipolar plate and the disk base 10 can fit together completely and form a sufficiently reliable support.

[0032] In this embodiment, the disk base 10 is provided with a magnetic switch; thereby, by opening or closing the magnetic switch, the disk base 10 can firmly attract the outer frame pressure plate 20, the inner cavity pressure plate 30, and the air port pressure plate 40.

[0033] In this embodiment, the outer frame 11 corresponds to the outer frame pressure plate 20, the inner cavity 12 corresponds to the inner cavity pressure plate 30, and the air port 13 corresponds to the air port pressure plate 40; the inner peripheral edge of the outer frame 11 is provided with an outer frame protruding rib 16, the outer edge of the inner cavity 12 is provided with an inner cavity protruding rib 17, and the outer edge of the air port 13 is provided with an air port protruding rib 18.

[0034] The outer frame pressure plate 20 has an outer frame pressure plate protrusion 21 corresponding to the outer frame protrusion 16 on the side facing the outer frame 11, the inner cavity pressure plate 30 has an inner cavity pressure plate protrusion 31 corresponding to the inner cavity protrusion 17 on the side facing the inner cavity 12, and the air port pressure plate 40 has an air port pressure plate protrusion 41 corresponding to the air port protrusion 18 on the side facing the air port 13.

[0035] In this embodiment, the outer frame pressure plate 20 is provided with a positioning hole 26 that matches the positioning pin 25, and the inner cavity pressure plate 30 is provided with an inner cavity positioning hole 36 that matches the inner cavity positioning pin 35.

[0036] A first welding path 50 is formed between the inner periphery of the outer frame pressure plate 20 and the outer edge of the inner cavity pressure plate 30 and the outer edge of the air port pressure plate 40, and a second welding path 60 is formed between the outer edge of the inner cavity pressure plate 30 and the outer edge of the air port pressure plate 40.

[0037] In this embodiment, the first welding path 50 is connected to the second welding path 60; the first clearance groove 14 is located below the first welding path 50 and can be connected to the first welding path 50; the second clearance groove 15 is located below the second welding path 60 and can be connected to the second welding path 60.

[0038] In this embodiment, the outer frame pressure plate 20, the inner cavity pressure plate 30, and the air vent pressure plate 40 facing the disk base 10 are all machined according to the protruding contour dimensions of the metal bipolar plate. The metal bipolar plate is pressed and installed on the disk base 10 by positioning pins 25 and inner cavity positioning pins 35 on the disk base 10. This ensures that the periphery of the metal bipolar plate can be pressed by the disk base 10 against the outer frame pressure plate 20, the inner cavity pressure plate 30, and the air vent pressure plate 40 after the magnetic switch is turned on, thereby ensuring that the periphery of the metal bipolar plate can fit tightly against the disk base.

[0039] The steps of the fixture of this utility model are as follows;

[0040] First, place the first monopolar plate with the protruding side facing down on the disk base 10, so that the protruding part of the first monopolar plate falls completely into the groove 19 on the outer frame 11, and then the first monopolar plate fits against the outer frame 11, inner cavity 12 and air vent 13 on the disk base 10.

[0041] Second, place the second monopolar plate with its convex side facing upwards, align the edge of the second monopolar plate with the edge of the first monopolar plate, and then place the second monopolar plate on the first monopolar plate and attach them together.

[0042] Third, the inner cavity pressure plate 30 is aligned with the inner cavity positioning pin 35 in the inner cavity 12 via the inner cavity positioning hole 36, so that the inner cavity pressure plate 30 is placed on the second monopolar plate.

[0043] Fourth, place the four gas port pressure plates 40 in sequence at the corresponding gas port positions of the second monopolar plate, so that the gas port pressure plate protrusions 41 on the gas port pressure plates 40 completely fall into the plane of the outer ring of the protrusions around the gas port of the second monopolar plate.

[0044] Fifth, the outer frame pressure plate 20 is aligned with the four positioning pins 25 in the outer frame 11 using four positioning holes 26, and the outer frame pressure plate 20 is placed on the second single-electrode plate; thereby, a first welding path 50 is formed between the inner periphery of the outer frame pressure plate 20 and the outer edge of the inner cavity pressure plate 30 and the outer edge of the air port pressure plate 40, and a second welding path 60 is formed between the outer edge of the inner cavity pressure plate 30 and the outer edge of the air port pressure plate 40; and the first welding path 50 and the second welding path 60 are connected.

[0045] 6. Using the magnetic switch on the disk base 10, adjust it to the suction position. The magnetic force of the disk base 10 will firmly attach the outer frame pressure plate 20, the inner cavity pressure plate 30, and the air port pressure plate 40 to the second monopolar plate. The clamping is now complete.

[0046] It should be noted that the welding path of the metal bipolar plate exists before the metal bipolar plate is welded.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the technical solutions of this utility model have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A welding fixture for a metal bipolar plate of a fuel cell, characterized in that: The disk includes a disk base (10), an outer frame pressure plate (20), an inner cavity pressure plate (30), and an air port pressure plate (40). The disk base (10) includes an outer frame (11) corresponding to the outer frame pressure plate (20), an inner cavity (12) corresponding to the inner cavity pressure plate (30), and an air port (13) corresponding to the air port pressure plate (40). The outer frame (11) has an outer frame protrusion rib (16) on its inner peripheral edge, the inner cavity (12) has an inner cavity protrusion rib (17) on its outer edge, and the air port (13) has an air port protrusion rib (18) on its outer edge. The outer frame pressure plate (20) has an outer frame pressure plate protrusion (21) corresponding to the outer frame protrusion (16) on the side facing the outer frame (11), the inner cavity pressure plate (30) has an inner cavity pressure plate protrusion (31) corresponding to the inner cavity protrusion (17) on the side facing the inner cavity (12), and the air port pressure plate (40) has an air port pressure plate protrusion (41) corresponding to the air port protrusion (18) on the side facing the air port (13).

2. The welding fixture for the metal bipolar plate of a fuel cell according to claim 1, characterized in that: A first welding path (50) is formed between the inner periphery of the outer frame pressure plate (20) and the outer edge of the inner cavity pressure plate (30) and the outer edge of the air port pressure plate (40), and a second welding path (60) is formed between the outer edge of the inner cavity pressure plate (30) and the outer edge of the air port pressure plate (40).

3. The welding fixture for the metal bipolar plate of a fuel cell according to claim 2, characterized in that: A first clearance groove (14) is provided between the inner periphery of the outer frame (11) and the outer edge of the inner cavity (12) and the outer edge of the air port (13), and a second clearance groove (15) is provided between the outer edge of the air port (13) and the outer edge of the inner cavity (12).

4. The welding fixture for the metal bipolar plate of a fuel cell according to claim 3, characterized in that: The first welding path (50) is connected to the second welding path (60).

5. The welding fixture for the metal bipolar plate of a fuel cell according to claim 4, characterized in that: The first venting groove (14) is connected to the second venting groove (15).

6. The welding fixture for the metal bipolar plate of a fuel cell according to claim 5, characterized in that: The first clearance groove (14) is located below the first welding path (50); the second clearance groove (15) is located below the second welding path (60).

7. The welding fixture for the metal bipolar plate of a fuel cell according to claim 1, characterized in that: The outer frame (11) is provided with a groove (19) that matches the protrusion of the single plate.

8. The welding fixture for the metal bipolar plate of a fuel cell according to claim 1, characterized in that: The outer frame (11) is provided with positioning pins (25) on all four sides, and the outer frame pressure plate (20) is provided with positioning holes (26) that match the positioning pins (25).

9. The welding fixture for the metal bipolar plate of a fuel cell according to claim 1, characterized in that: Both ends of the inner cavity (12) are provided with inner cavity positioning pins (35), and the inner cavity pressure plate (30) is provided with inner cavity positioning holes (36) that match the inner cavity positioning pins (35).

10. The welding fixture for the metal bipolar plate of a fuel cell according to claim 1, characterized in that: The disk base (10) is equipped with a magnetic switch.

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