Fuel cell metal bipolar plate positioning mechanism

Abstract

The utility model provides a fuel cell metal bipolar plate positioning mechanism which comprises a cover plate, a bottom plate and a positioning assembly, the positioning assembly comprises a sealing block, a floating positioning pin and a spring, the sealing block is provided with a groove, and the sealing block is arranged on the bottom plate; a part of the floating positioning pin movably extends into the groove, one end, facing the groove, of the part of the floating positioning pin and the groove in the same direction form a sealing cavity, and the other end of the floating positioning pin is provided with an air inlet which penetrates through the floating positioning pin and is communicated with the sealing cavity; and the spring sleeves one end, far away from the groove, of the floating positioning pin so as to promote the floating positioning pin to move downwards. According to the utility model, the guide and coarse positioning effects can be realized on the deviation of the stack of the metal bipolar plates of the fuel cell, the high-temperature deformation of the product in the welding process can be avoided, and meanwhile, the damage to the product and the positioning hole thereof in the material taking process by a machine can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell metal bipolar plate welding, in particular to a fuel cell metal bipolar plate positioning mechanism. Background Art

[0002] The stacking deviation of the anode and cathode plates is a problem that may occur during the production, assembly or operation of fuel cells or other electrochemical devices. When the anode and cathode plates are not properly aligned during the stacking process, or their positions change for some reason during use, the stacking deviation will occur. This deviation may cause a series of problems and affect the performance and life of the device.

[0003] At present, in the process of realizing the automation of fuel cell metal bipolar plate production, the positive and negative plates do not overlap when stacking on the fixture. After the fixed positioning pins are used, the product is deformed due to the heat of welding after welding, and it may even be impossible to remove it. In addition, there is a potential risk of damaging the product. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a fuel cell metal bipolar plate positioning mechanism, which can guide and roughly position the offset of the fuel cell metal bipolar plate stack, thereby avoiding high-temperature deformation of the product during the welding process, and effectively preventing the machine from damaging the product and its positioning holes during the material removal process.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A fuel cell metal bipolar plate positioning mechanism, comprising:

[0007] A cover plate, a bottom plate and a positioning assembly, wherein the cover plate and the bottom plate are used to fix a metal bipolar plate, and the metal bipolar plate is located between the cover plate and the bottom plate;

[0008] The positioning assembly includes a sealing block, a floating positioning pin and a spring, the sealing block is provided with a groove, and the sealing block is arranged on the bottom plate;

[0009] Part of the floating positioning pins can be movably extended into the groove, and one end of the floating positioning pins facing the groove forms a sealed cavity with the groove in the same direction as the groove, and the other end of the floating positioning pin is provided with an air inlet penetrating through the pin itself and communicating with the sealed cavity;

[0010] The spring is sleeved on one end of the floating positioning pin away from the groove to urge the floating positioning pin to move downward.

[0011] According to a preferred embodiment, it also includes an outer shape positioning pin, which is arranged on the side wall of the bottom plate and passes through the bottom plate.

[0012] According to a preferred embodiment, the outer shape positioning pin is provided with an exhaust passage, and the exhaust passage is connected to the sealing cavity through a flow passage.

[0013] According to a preferred embodiment, the floating positioning pin is wider at the top and narrower at the bottom, and one end of the floating positioning pin passes through the positioning hole.

[0014] According to a preferred embodiment, a central groove is formed at the lower end of the floating positioning pin, and the central groove is communicated with the air inlet.

[0015] According to a preferred embodiment, the metal bipolar plate is provided with a plurality of positioning holes, each positioning assembly is arranged corresponding to the positioning hole, and the floating positioning pin passes through the positioning hole and extends into the corresponding groove.

[0016] According to a preferred embodiment, the metal bipolar plate is provided with two positioning holes, the metal bipolar plate is arranged in a rectangular shape, and the two positioning holes are arranged diagonally with respect to the metal bipolar plate.

[0017] According to a preferred embodiment, the front and rear side walls of the base plate are provided with first guide blocks, and the first guide blocks are provided with a plurality of first air injection holes; the left and right side walls of the base plate are provided with second guide blocks, and the first guide blocks are provided with a plurality of second air injection holes.

[0018] According to a preferred embodiment, an outer frame is further included, wherein the outer frame is located above the bottom plate and is arranged on the periphery of the cover plate.

[0019] According to a preferred embodiment, the top of the floating positioning pin is arranged as an inclined surface.

[0020] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0021] The utility model can guide and roughly position the deviation of the metal bipolar plate stack of the fuel cell in the automated production. The floating positioning pin of the cover plate pressing the product can be retracted to avoid high-temperature deformation of the product during the welding process. At the same time, it can effectively prevent the machine from damaging the product and its positioning hole during the material removal process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a fuel cell metal bipolar plate positioning mechanism provided in Example 1;

[0024] Figure 2 for Figure 1 Schematic diagram of the BB local cross-section three-dimensional structure;

[0025] Figure 3 Another partial cross-sectional structural schematic diagram of a fuel cell metal bipolar plate positioning mechanism provided in this embodiment 1;

[0026] Figure 4 This is a schematic diagram of the structural decomposition of a fuel cell metal bipolar plate positioning mechanism provided in Example 1.

[0027] Icons: 1. Cover plate; 2. Bottom plate; 3. Metal bipolar plate; 31. Positioning hole; 4. Sealing block; 5. Floating positioning pin; 51. Air inlet; 52. Center groove; 6. Spring; 7. Sealing cavity; 8. External positioning pin; 81. Exhaust duct; 9. First guide block; 91. First air injection hole; 10. Second guide block; 101. Second air injection hole; 11. Outer frame. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Example 1

[0032] Please refer to Figures 1 to 4 A fuel cell metal bipolar plate positioning mechanism, comprising: a cover plate 1, a base plate 2 and a positioning assembly, wherein the cover plate 1 and the base plate 2 are used to fix the metal bipolar plate 3, and the metal bipolar plate 3 is located between the cover plate 1 and the base plate 2; the positioning assembly comprises a sealing block 4, a floating positioning pin 5 and a spring 6, wherein the sealing block 4 is provided with a groove, and the sealing block 4 is arranged on the base plate 2; a part of the floating positioning pin 5 can be movably extended into the groove, and an end of the part of the floating positioning pin 5 facing the groove forms a sealing cavity 7 with the groove in the same direction thereof, and an air inlet 51 is provided at the other end of the floating positioning pin 5, which penetrates the floating positioning pin 5 and communicates with the sealing cavity 7; the spring 6 is sleeved on an end of the floating positioning pin 5 away from the groove to cause the floating positioning pin 5 to move downward. The sealing block 4 is fixed to the base plate 2 or embedded in the base plate 2, and the sealing block 4 can play a fixing role, and can cause the spring 6 to generate a reverse thrust.

[0033] Preferably, it also includes an outer shape positioning pin 8 , which is arranged on the side wall of the bottom plate 2 and passes through the bottom plate 2 .

[0034] Preferably, the outer shape positioning pin 8 is provided with an exhaust passage 81, and the exhaust passage 81 is connected to the sealing cavity 7 through a flow passage. The positioning pin can play a role in precise positioning of the processing and lock the position of the product. In addition, the exhaust passage 81 can exhaust the gas in the sealing cavity 7 through the flow passage of the bottom plate 2, so that the spring 6 causes the floating positioning pin 5 to descend.

[0035] Preferably, the floating positioning pin 5 is set to be wide at the top and narrow at the bottom, and the lower end of the floating positioning pin 5 can be slidably filled in the groove. In this embodiment, the floating positioning pin 5 is nut-shaped, and the shaft diameter of the lower end is larger than the shaft diameter of the upper end. The shaft diameter of the lower end of the floating positioning pin 5 is larger than the aperture of the positioning hole 31, and the upper end of the floating positioning pin 5 is smaller than the aperture of the positioning hole 31. Therefore, it can be understood that the positioning hole 31 is sleeved on the upper end of the floating positioning pin 5, so the lower end of the floating positioning pin 5 cannot pass through the positioning hole 31 during the lifting process. The spring 6 is sleeved on the upper end of the floating positioning pin 5 and is located below the anode and cathode plates. The fixed anode and cathode plates can have a fixing effect on the spring 6, so that the spring 6 generates a reverse thrust.

[0036] Preferably, a central groove 52 is provided at the lower end of the floating positioning pin 5, and the central groove 52 is connected to the air inlet 51. The central groove 52 can allow the sealing cavity 7 to accommodate more gas, and the gas contact area at the lower end of the floating positioning pin 5 is larger, thereby ensuring the space for gas injection and facilitating the gas to push the floating positioning pin 5.

[0037] Preferably, the metal bipolar plate 3 is provided with a plurality of positioning holes 31, each positioning assembly is provided corresponding to the positioning hole 31, and one end of the floating positioning pin 5 passes through the positioning hole 31. In this embodiment, there are two positioning holes 31, but the number of positioning holes 31 is not limited to two.

[0038] Preferably, the metal bipolar plate 3 is provided with two positioning holes 31, the metal bipolar plate 3 is arranged in a rectangular shape, and the two positioning holes 31 are arranged diagonally with respect to the metal bipolar plate 3. The metal bipolar plate 3 can be positioned as a whole.

[0039] Preferably, the front and rear side walls of the bottom plate 2 are provided with first guide blocks 9, and the first guide blocks 9 are provided with a plurality of first gas injection holes 91; the left and right side walls of the bottom plate 2 are provided with second guide blocks 10, and the first guide blocks 9 are provided with a plurality of second gas injection holes 101. The first gas injection holes 91 and the second gas injection holes 101 can be used to inject nitrogen or other gases to promote the welding efficiency of the metal bipolar plate 3 and improve the welding effect.

[0040] Preferably, an outer frame 11 is further included, and the outer frame 11 is located above the bottom plate 2 and is arranged at the periphery of the cover plate 1. The outer frame 11 can be provided to limit the processed metal bipolar plate 3.

[0041] Preferably, the top of the floating positioning pin 5 is provided with an inclined surface. The floating positioning pin 5 is beveled to allow the product to be introduced better.

[0042] Working principle of the utility model: The utility model can prevent the stacking of positive and negative plates (fuel cell metal bipolar plates, referred to as metal bipolar plates 3 in this article) from offsetting. The positive and negative plates have positioning holes 31, and the floating positioning pin 5 matches the positioning hole 31. Before installing the positive and negative plates, the floating positioning pin 5 can be lifted up through the air inlet 51, and the gas source is introduced into the air inlet 51 so that the gas passes through the inside of the floating positioning pin 5 and enters the sealed cavity 7. The floating positioning pin 5 is matched with the gap of the groove, and the lower end of the floating positioning pin 5 and the bottom of the groove form a sealed cavity 7. As the amount of gas increases, the pressure increases, thereby prompting the floating positioning pin 5 to move upward, and at the same time the spring 6 is compressed; the positive and negative plates are installed on the base plate 2, and the cover plate 1 covers the positive and negative plates on the base plate 2. After the positive and negative plates are installed, the gas can be discharged through the air inlet 51 or the exhaust duct 81, and the spring 6 prompts the floating positioning pin 5 to move downward, thereby completing the installation of the positioning mechanism. The floating locating pin 5 can be driven to rise by inflating / injecting air into the sealing cavity 7, and can be driven to descend by giving up. The lower end of the floating locating pin 5 satisfies the conditions of filling the groove and fitting with the groove clearance (slidable).

[0043] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A fuel cell metal bipolar plate positioning mechanism, characterized in that: include: A cover plate, a bottom plate and a positioning assembly, wherein the cover plate and the bottom plate are used to fix a metal bipolar plate, and the metal bipolar plate is located between the cover plate and the bottom plate; The positioning assembly includes a sealing block, a floating positioning pin and a spring, the sealing block is provided with a groove, and the sealing block is arranged on the bottom plate; Part of the floating positioning pins can be movably extended into the groove, and one end of the floating positioning pins facing the groove forms a sealed cavity with the groove in the same direction as the groove, and the other end of the floating positioning pin is provided with an air inlet penetrating through the pin itself and communicating with the sealed cavity; The spring is sleeved on one end of the floating positioning pin away from the groove to urge the floating positioning pin to move downward.

2. The fuel cell metal bipolar plate positioning mechanism according to claim 1, characterized in that: It also includes an outer shape positioning pin, which is arranged on the side wall of the bottom plate and passes through the bottom plate.

3. The fuel cell metal bipolar plate positioning mechanism according to claim 2, characterized in that: The outer shape positioning pin is provided with an exhaust passage, and the exhaust passage is connected with the sealing cavity through a flow passage.

4. The fuel cell metal bipolar plate positioning mechanism according to claim 1, characterized in that: The floating positioning pin is arranged to be wide at the top and narrow at the bottom, and the lower end of the floating positioning pin can be slidably filled in the groove.

5. The fuel cell metal bipolar plate positioning mechanism according to claim 4, characterized in that: A central groove is formed at the lower end of the floating positioning pin, and the central groove is communicated with the air inlet.

6. The fuel cell metal bipolar plate positioning mechanism according to claim 5, characterized in that: The metal bipolar plate is provided with a plurality of positioning holes, each of the positioning components is arranged corresponding to the positioning hole, and one end of the floating positioning pin passes through the positioning hole.

7. The fuel cell metal bipolar plate positioning mechanism according to claim 6, characterized in that: The metal bipolar plate is provided with two positioning holes, the metal bipolar plate is arranged in a rectangular shape, and the two positioning holes are arranged diagonally with respect to the metal bipolar plate.

8. The fuel cell metal bipolar plate positioning mechanism according to claim 1, characterized in that: The utility model also comprises an outer frame, wherein the outer frame is located above the bottom plate and is arranged on the periphery of the cover plate.

9. The fuel cell metal bipolar plate positioning mechanism according to claim 1, characterized in that: The front and rear side walls of the bottom plate are provided with first guide blocks, and the first guide blocks are provided with a plurality of first air injection holes; The left and right side walls of the bottom plate are provided with second guide blocks, and the first guide blocks are provided with a plurality of second air injection holes.

10. The fuel cell metal bipolar plate positioning mechanism according to claim 1, characterized in that: The top of the floating positioning pin is arranged as an inclined surface.

Images