Sealing structure for bipolar plate of fuel cell

Abstract

The utility model discloses a fuel cell bipolar plate sealing structure, which relates to the technical field of fuel cells and comprises a sealing frame, a first sealing groove is arranged on the upper surface of the sealing frame, a first sealing block is clamped in the first sealing groove, and a first electrode plate is fixedly connected to the top of the first sealing block. And a second sealing groove is formed in the lower surface of the sealing frame, a second sealing block is clamped in the second sealing groove, and a second electrode plate is fixedly connected to the bottom of the second sealing block. Through the structural design of the first electrode plate, the second electrode plate, the sealing frame, the first sealing block, the first sealing groove, the second sealing block, the second sealing groove and the sealing gasket, the bipolar plate cannot deform after working for a long time, so that the sealing performance of the bipolar plate is ensured; and meanwhile, sealing gaskets made of polypropylene materials are arranged on the inner walls of the first sealing groove and the second sealing groove, so that the sealing effect is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, concretely is a kind of fuel cell bipolar plate sealing structure. BACKGROUND

[0002] Bipolar plate is the important component of proton exchange membrane fuel cell, and is used to support fuel cell and provide the effect of reaction gas, coolant passage. In terms of the use condition of bipolar plate itself, the bipolar plate itself not only needs to have higher conductivity, corrosion resistance and mechanical properties etc., but also needs to have good sealing performance, to avoid the leakage of cooling water and reaction gas.

[0003] For the sealing of fuel cell cooling water, generally includes two sealing forms of soft sealing and hard sealing. For the bipolar plate processed by metal foil stamping, cooling water cavity can be sealed by hard sealing, such as laser welding etc.;But for the bipolar plate of other materials processed by expanded graphite stamping or machining, cooling water cavity is generally sealed by soft sealing, such as sealing glue, adhesive etc.

[0004] Due to the extremely thin thickness of the bipolar plate, the existing soft sealing generally adopts the structure of plane sealing, that is, the two bipolar plates are both plane. Due to the high temperature of fuel cell under working condition, the sealing material will have a certain degree of permanent deformation after long time working, which will cause the sealing performance of bipolar plate to decrease and the fuel cell to fail. In this case, the plane sealing structure puts forward very high requirements on sealing material and installation etc.

[0005] Therefore, it is necessary to provide a fuel cell bipolar plate sealing structure for the above technical solution. UTILITY MODEL CONTENTS

[0006] Therefore, the purpose of the utility model is to provide a fuel cell bipolar plate sealing structure to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the utility model provides the following technical scheme:

[0008] A fuel cell bipolar plate sealing structure, comprising a sealing frame, a first sealing groove is formed on the upper surface of the sealing frame, a first sealing block is connected to the inside of the first sealing groove, a first electrode plate is fixedly connected to the top of the first sealing block, a second sealing groove is formed on the lower surface of the sealing frame, a second sealing block is connected to the inside of the second sealing groove, and a second electrode plate is fixedly connected to the bottom of the second sealing block.

[0009] Preferably, sealing pads are fixedly arranged on the inner walls of the first sealing groove and the second sealing groove, and the sealing pads are made of polypropylene material.

[0010] Preferably, both sides of the first electrode plate are fixedly connected with first slots, and both sides of the second electrode plate are fixedly connected with second slots.

[0011] Preferably, the number of the first slots is four, and the number of the second slots is four.

[0012] Preferably, the first slots and the second slots are clamped with a plug rod at the slot opening, and both ends of the plug rod are clamped in the first slot and the second slot.

[0013] Preferably, the right side of the first sealing groove and the second sealing groove is provided with a second positioning groove in communication, and the second positioning groove is provided with a second positioning column in the inside.

[0014] Preferably, the front and rear ends of the first sealing groove and the second sealing groove are provided with a first positioning groove in communication, the number of the first positioning groove is two, and the first positioning groove is provided with a first positioning column in the inside.

[0015] The utility model has the advantages of:

[0016] (1) through the structure design of the first electrode plate, the second electrode plate, the sealing frame, the first sealing block, the first sealing groove, the second sealing block, the second sealing groove and the sealing pad, can realize not producing deformation after long time work, thereby guaranteeing the sealing performance of the bipolar plate, and the sealing pad made of polypropylene material is arranged on the inner wall of the first sealing groove and the second sealing groove, which can further improve the sealing effect, solve the defect that the soft sealing generally adopts the plane sealing structure and appears permanent deformation to a certain extent after long time work, thereby causing the sealing performance of the bipolar plate to decrease, and even the risk of fuel cell failure.

[0017] (2) through the structure design of the plug rod, the first slot, the second slot, the first positioning column, the first positioning groove, the second positioning column and the second positioning groove, the electrode plate and the second electrode plate can be fixed and limited after sealing, so that the purpose of further improving the sealing effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic view of the fuel cell bipolar plate sealing structure in the utility model embodiment;

[0019] Figure 2 It is a side view structure schematic view of the fuel cell bipolar plate sealing structure in the utility model embodiment;

[0020] Figure 3 It is a rear view structure schematic view of the fuel cell bipolar plate sealing structure in the utility model embodiment;

[0021] Figure 4 It is the top view structural schematic drawing of the fuel cell bipolar plate sealing structure in the embodiment of the utility model;

[0022] Figure 5 It is the local structure schematic drawing of the first sealing block and the second sealing block in the embodiment of the utility model;

[0023] Figure 6 It is the local structure schematic drawing of the second sealing groove in the embodiment of the utility model;

[0024] Figure 7 It is Figure 5 The enlarged structure schematic drawing of A in the figure.

[0025] Reference numerals in the figure:

[0026] 1, first electrode plate; 2, insertion rod; 3, second electrode plate; 4, first insertion groove; 5, second insertion groove; 6, first positioning column; 7, first positioning groove; 8, second positioning column; 9, second positioning groove; 10, sealing frame; 11, first sealing block; 12, first sealing groove; 13, second sealing block; 14, second sealing groove; 15, sealing gasket. DETAILED DESCRIPTION

[0027] In order to make the person skilled in the art better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0028] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term "arrangement", "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connected, can be two elements inside the intercommunication.For ordinary skilled in the art, can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0031] As Figures 1-7 The utility model discloses a fuel cell bipolar plate sealing structure, the fuel cell bipolar plate sealing structure includes sealing frame 10, the upper surface of sealing frame 10 is set with first sealing groove 12, the inside of first sealing groove 12 is provided with the first sealing block 11 of clamping, the top of first sealing block 11 is fixedly connected with first electrode plate 1, the lower surface of sealing frame 10 is set with second sealing groove 14, the inside of second sealing groove 14 is provided with the second sealing block 13 of clamping, the bottom of second sealing block 13 is fixedly connected with second electrode plate 3, and the inner wall of first sealing groove 12 and second sealing groove 14 is fixedly provided with sealing gasket 15.

[0032] As a preferred embodiment of the embodiment, the sealing gasket 15 is made of polypropylene material, which has the advantages of light weight, high strength, heat resistance, chemical corrosion resistance and good electrical insulation performance. The sealing gasket 15 can maintain stable sealing effect under various industrial and environmental conditions, and is easy to process and maintain.

[0033] As Figure 1 , Figure 5 , Figure 6 And Figure 7 As shown in the figure, when the first electrode plate 1 and the second electrode plate 3 need to be installed and sealed, the first sealing block 11 on the first electrode plate 1 is inserted into the corresponding first sealing groove 12 on the sealing frame 10, and the second sealing block 13 on the second electrode plate 3 is inserted into the corresponding second sealing groove 14 on the sealing frame 10, thereby completing the sealing of the first electrode plate 1 and the second electrode plate 3.

[0034] Since the first sealing block 11, the first sealing groove 12, the second sealing block 13 and the second sealing groove 14 are concave-convex, they will not deform after long-term work, thereby ensuring the sealing performance of the bipolar plate.

[0035] Meanwhile, the sealing gasket 15 made of polypropylene material arranged on the inner walls of the first sealing groove 12 and the second sealing groove 14 can further improve the sealing effect, so as to solve the problem that the soft sealing generally adopts a flat sealing structure, that is, the two polar plates are flat and are attached to each other, and due to the high temperature of the fuel cell under the working condition, the sealing material will be permanently deformed to a certain extent after long-term work, which will cause the sealing performance of the bipolar plate to be reduced, and further cause the risk of failure of the fuel cell. Therefore, for the flat sealing structure under this condition, high requirements are put forward for the sealing material and installation.

[0036] In this embodiment, the two side walls of the first electrode plate 1 are fixedly connected with the first insertion grooves 4, and the two side walls of the second electrode plate 3 are fixedly connected with the second insertion grooves 5, so that the electrode plates can be quickly connected or disconnected with other components as needed, improving the flexibility and expandability of the system.

[0037] Preferably, the number of the first insertion grooves 4 is four, and the number of the second insertion grooves 5 is four. In this way, the four insertion grooves are evenly distributed on the two sides of the electrode plate, which helps to evenly distribute the stress generated during installation or operation, reduces stress concentration, and improves the durability of the electrode plate.

[0038] In this embodiment, the insertion rod 2 is clamped at the openings of the first insertion grooves 4 and the second insertion grooves 5, and the two ends of the insertion rod 2 are clamped in the interiors of the first insertion grooves 4 and the second insertion grooves 5.

[0039] In this way, by clamping the insertion rod 2 in the first insertion grooves 4 and the second insertion grooves 5, the connection stability between the electrode plates can be enhanced. This structure design is similar to the mortise and tenon structure, which improves the overall stability and vibration resistance of the structure through physical clamping.

[0040] In this embodiment, the right sides of the first sealing groove 12 and the second sealing groove 14 are provided with the second positioning grooves 9 in communication, the interiors of the second positioning grooves 9 are provided with the second positioning columns 8, and the front and rear ends of the first sealing groove 12 and the second sealing groove 14 are provided with the first positioning grooves 7 in communication.

[0041] In this way, by arranging the second positioning grooves 9 in communication on the right sides of the first sealing groove 12 and the second sealing groove 14, and arranging the second positioning columns 8 therein, and arranging the first positioning grooves 7 in communication at the front and rear ends, the precise positioning and stable assembly between components can be ensured.

[0042] Preferably, the number of the first positioning grooves 7 is two, and the interiors of each first positioning groove 7 are provided with the first positioning column 6, which not only improves the accuracy of positioning and the stability of the structure, but also optimizes the assembly process, enhances the vibration resistance, and improves the interchangeability and maintainability.

[0043] As Figure 1 ,Figure 2 、 Figure 3 and Figure 4 As shown in the figure, when the first electrode plate 1 and the second electrode plate 3 are sealed, the first positioning column 6 is inserted into the corresponding first positioning groove 7, and the second positioning column 8 is inserted into the corresponding second positioning groove 9, and the first positioning column 6, the first positioning groove 7, the second positioning column 8 and the second positioning groove 9 can be matched with each other, so that the first sealing block 11 and the second sealing block 13 in the sealing frame 10 can be fixed, thereby improving the connection effect of the first electrode plate 1 and the second electrode plate 3 with the sealing frame 10.

[0044] Specific working principle:

[0045] When the first electrode plate 1 and the second electrode plate 3 need to be sealed during installation, the first sealing block 11 on the first electrode plate 1 is inserted into the corresponding first sealing groove 12 on the sealing frame 10, and the second sealing block 13 on the second electrode plate 3 is inserted into the corresponding second sealing groove 14 on the sealing frame 10, so that the sealing of the first electrode plate 1 and the second electrode plate 3 is completed. Since the first sealing block 11, the first sealing groove 12, the second sealing block 13 and the second sealing groove 14 are concave-convex, they will not deform after a long time of work, thereby ensuring the sealing performance of the bipolar plate; meanwhile, the sealing gasket 15 made of polypropylene material is arranged on the inner wall of the first sealing groove 12 and the second sealing groove 14, which can further improve the sealing effect.

[0046] Secondly, when the first electrode plate 1 and the second electrode plate 3 are sealed, the first positioning column 6 is inserted into the corresponding first positioning groove 7, and the second positioning column 8 is inserted into the corresponding second positioning groove 9, and the first positioning column 6, the first positioning groove 7, the second positioning column 8 and the second positioning groove 9 can be matched with each other, so that the first sealing block 11 and the second sealing block 13 in the sealing frame 10 can be fixed, thereby improving the connection effect of the first electrode plate 1 and the second electrode plate 3 with the sealing frame 10, and the plug rod 2 is inserted into the corresponding first insertion groove 4 and second insertion groove 5, which can further improve the connection effect.

[0047] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, on the premise of not departing from the utility model concept, can also make several deformations and improvements, and these all belong to the protection scope of the utility model, therefore the protection scope of the utility model patent should be accurate to the range defined in the claim.

Claims

1. A fuel cell bipolar plate seal structure, characterized by: Including the sealed frame (10), the upper surface of the sealed frame (10) is provided with the first sealing groove (12), the inside of the first sealing groove (12) is provided with the first sealing block (11), the top of the first sealing block (11) is fixedly connected with the first electrode plate (1), the lower surface of the sealed frame (10) is provided with the second sealing groove (14), the inside of the second sealing groove (14) is provided with the second sealing block (13), the bottom of the second sealing block (13) is fixedly connected with the second electrode plate (3).

2. The fuel cell bipolar plate seal structure of claim 1, wherein: The inner wall of the first sealing groove (12) and the second sealing groove (14) is fixedly provided with a sealing gasket (15).

3. The fuel cell bipolar plate seal structure of claim 2, wherein: The sealing gasket (15) is made of polypropylene material.

4. The fuel cell bipolar plate seal structure of claim 1, wherein: The both sides of the first electrode plate (1) are fixedly connected with the first slot (4), and the both sides of the second electrode plate (3) are fixedly connected with the second slot (5).

5. The fuel cell bipolar plate seal structure of claim 4, wherein: The number of the first slot (4) is four, and the number of the second slot (5) is four.

6. The fuel cell bipolar plate seal structure of claim 4, wherein: The slot of the first slot (4) and the second slot (5) is provided with a plug rod (2).

7. The fuel cell bipolar plate seal structure of claim 6, wherein: The both ends of the plug rod (2) are respectively clamped in the inside of the first slot (4) and the second slot (5).

8. The fuel cell bipolar plate seal structure of claim 1, wherein: The right side of the first sealing groove (12) and the second sealing groove (14) is provided with a second positioning groove (9) in communication, and the inside of the second positioning groove (9) is provided with a second positioning column (8).

9. The fuel cell bipolar plate seal structure of claim 1, wherein: The front and rear ends of the first sealing groove (12) and the second sealing groove (14) are provided with a first positioning groove (7) in communication.

10. The fuel cell bipolar plate seal structure of claim 9, wherein: The number of the first positioning groove (7) is two, and the inside of the first positioning groove (7) is provided with a first positioning column (6).

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