Sealing structure and fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and discloses a sealing structure and a fuel cell, the sealing structure is used for sealing between a distribution manifold and an electric pile end plate, the surface of the electric pile end plate close to the distribution manifold is provided with an inner groove, a plurality of communicating grooves, an outer groove and a positioning groove, the inner groove is arranged in the outer groove at intervals, the communicating grooves are arranged in the outer groove at intervals, and the positioning groove is arranged in the outer groove. The two ends of the communicating groove communicate with the inner groove and the outer groove correspondingly, and the positioning groove is formed in the outer wall of the outer groove in a connected mode and communicates with the outer groove. The outer sealing rings are arranged on the periphery of the inner sealing ring at intervals; the positioning strip is arranged on the outer wall of the outer sealing ring; two ends of the connecting strips are respectively connected with the outer wall of the inner sealing ring and the inner wall of the outer sealing ring; wherein the inner sealing ring is correspondingly installed in the inner groove, the outer sealing ring is correspondingly installed in the outer groove, and the connecting strips are arranged in the communicating grooves in a one-to-one correspondence mode. The sealing structure and the fuel cell are good in sealing effect and easy to disassemble and assemble.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a sealing structure and a fuel cell. Background Technology

[0002] In fuel cells, the distribution manifold is made of plastic insulation material, while the stack endplates are made of aluminum-plastic composite material (the inner cavity of the flow channel is plastic, and the outer layer is aluminum alloy). The insulation between the coolant in the distribution manifold and the aluminum alloy structure of the stack endplate has strict requirements, directly affecting the overall insulation performance of the fuel cell. Currently, the single O-ring seal structure has a generally poor sealing effect and the following drawbacks: after long-term operation, the coolant in the distribution manifold may seep outwards from the sealing groove into the external aluminum alloy structure in the form of a water film, leading to reduced insulation; during rain or vehicle washing, external oil stains or moisture from conductive substrates can intensify the penetration from the outside to the inside of the distribution manifold flow channel, causing further reduction in fuel cell insulation. To improve sealing, a double O-ring seal is used, but it is not a one-piece structure, which makes installation inconvenient. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure that has a good sealing effect and is easy to disassemble and assemble.

[0004] To achieve the above objectives, this utility model provides a sealing structure for sealing between a distribution manifold and a fuel cell stack end plate. The surface of the fuel cell stack end plate near the distribution manifold has an inner groove, a connecting groove, an outer groove, and a positioning groove. The inner grooves are spaced apart within the outer grooves. Multiple connecting grooves are provided, with both ends of each connecting groove communicating with the inner groove and the outer groove, respectively. The positioning groove is connected to the outer wall of the outer groove and communicates with it. The sealing structure includes:

[0005] Inner sealing ring;

[0006] An outer sealing ring is spaced apart on the outer periphery of the inner sealing ring;

[0007] A positioning strip is provided on the outer wall of the outer sealing ring; and

[0008] Multiple connecting strips, the two ends of which are respectively connected to the outer wall of the inner sealing ring and the inner wall of the outer sealing ring;

[0009] The inner sealing ring is installed in the inner groove, the outer sealing ring is installed in the outer groove, the connecting strips are installed in the connecting grooves, and the positioning strips are installed in the positioning grooves.

[0010] In some embodiments, both the inner sealing ring and the outer sealing ring are rectangular in shape.

[0011] In some embodiments, the ratio of the height to the width of the inner sealing ring is greater than 2.

[0012] In some embodiments, the width-to-height ratio of the outer sealing ring is greater than 1.5.

[0013] In some embodiments, the width of the outer sealing ring is greater than twice the width of the inner sealing ring.

[0014] In some embodiments, the height of the inner sealing ring is greater than the height of the outer sealing ring.

[0015] In some embodiments, the inner sealing ring, the outer sealing ring, the positioning strip, and the connecting strip are integrally formed.

[0016] In some embodiments, the height of the inner sealing ring is greater than the depth of the inner groove, and the height of the outer sealing ring is greater than the depth of the outer groove.

[0017] On the other hand, this utility model provides a fuel cell, including the aforementioned sealing structure.

[0018] This utility model provides a sealing structure, which has the following advantages compared with the prior art:

[0019] The two ends of multiple connecting strips are connected to the outer wall of the inner sealing ring and the inner wall of the outer sealing ring respectively, so that the entire sealing structure forms a whole, making disassembly and assembly convenient. The positioning strip is set on the outer wall of the outer sealing ring and is correspondingly set in the positioning groove for easy positioning, further improving the convenience of installation. Through the combined use of the inner and outer sealing rings, the sealing performance between the distribution manifold and the fuel cell stack end plate can be improved, ensuring a good sealing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a partial explosion structure of a fuel cell provided for other embodiments of the present invention.

[0021] Figure 2 This is a schematic diagram of the installation of the sealing structure on the end plate of the fuel cell stack, which is provided for some embodiments of this utility model.

[0022] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along the AA direction.

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0024] In the diagram: 1. Distribution manifold; 2. Fuel cell stack end plate; 21. Inner groove; 22. Connecting groove; 23. Outer groove; 24. Positioning groove; 100. Sealing structure; 3. Inner sealing ring; 4. Outer sealing ring; 5. Positioning strip; 6. Connecting strip. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] It should be understood that in the description of this application, the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.

[0027] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 2-4 As shown, the sealing structure 100 of some embodiments of this utility model is used for sealing between the distribution manifold 1 and the fuel cell stack end plate 2. The surface of the fuel cell stack end plate 2 near the distribution manifold 1 has an inner groove 21, a connecting groove 22, an outer groove 23 and a positioning groove 24. The inner groove 21 is spaced apart in the outer groove 23. Multiple connecting grooves 22 are provided. The two ends of the connecting groove 22 are respectively connected to the inner groove 21 and the outer groove 23. The positioning groove 24 is connected to the outer wall of the outer groove 23 and communicates with the outer groove 23. The sealing structure 100 includes an inner sealing ring 3, an outer sealing ring 4, a positioning strip 5 and multiple connecting strips 6.

[0029] The outer sealing ring 4 is spaced apart from the outer periphery of the inner sealing ring 3. This allows the outer sealing ring 4 to work in conjunction with the inner sealing ring 3, improving the sealing effect.

[0030] The positioning strip 5 is located on the outer wall of the outer sealing ring 4. The positioning strip 5 facilitates the positioning of the sealing structure 100 during installation, making the installation of the sealing structure 100 more convenient.

[0031] The two ends of the multiple connecting strips 6 are respectively connected to the outer wall of the inner sealing ring 3 and the inner wall of the outer sealing ring 4. The function of the connecting strips 6 is to connect the inner sealing ring 3 and the outer sealing ring 4 into a whole, making the sealing structure 100 easy to install and disassemble.

[0032] In use, the inner sealing ring 3 is installed in the inner groove 21, the outer sealing ring 4 is installed in the outer groove 23, the connecting strips 6 are installed in the connecting grooves 22, and the positioning strips 5 are installed in the positioning grooves 24. By installing the end face of the distribution manifold 1 onto the surface of the fuel cell stack end plate 2, the sealing structure 100 is compressed to achieve a sealing effect.

[0033] Based on the above structure, the two ends of the connecting strip 6 are respectively connected to the outer wall of the inner sealing ring 3 and the inner wall of the outer sealing ring 4, so that the entire sealing structure 100 forms a whole, making disassembly and assembly convenient. The positioning strip 5 is set on the outer wall of the outer sealing ring 4 and is correspondingly set in the positioning groove 24, which facilitates positioning and further improves the convenience of installation. Through the cooperation of the inner sealing ring 3 and the outer sealing ring 4, the sealing performance between the distribution manifold 1 and the fuel cell stack end plate 2 can be improved, ensuring a good sealing effect.

[0034] In some embodiments, both the inner sealing ring 3 and the outer sealing ring 4 are rectangular. The rectangular structure prevents movement after installation, improving the reliability of the sealing structure 100.

[0035] In some embodiments, the height-to-width ratio of the inner sealing ring 3 is greater than 2. The inner sealing ring 3 has a slender and tall structure, which can provide an airtight seal and prevent fluid medium from leaking out.

[0036] In some embodiments, the width-to-height ratio of the outer sealing ring 4 is greater than 1.5. The outer sealing ring 4 has a flat structure, which can prevent the infiltration of external media such as rainwater and oil. It also prevents the outer sealing ring 4 and the coolant in the fluid cavity of the fuel cell end plate 2 from forming a continuous water film, which would reduce the insulation resistance of the fuel cell.

[0037] In some embodiments, the width of the outer sealing ring 4 is greater than twice the width of the inner sealing ring 3. Furthermore, to prevent the outer sealing ring 4 from being crushed, the compression ratio of the outer sealing ring 4 is 5% less than that of the inner sealing ring 3.

[0038] In some embodiments, the height of the inner sealing ring 3 is greater than the height of the outer sealing ring 4.

[0039] In some embodiments, the inner sealing ring 3, the outer sealing ring 4, the positioning strip 5, and the connecting strip 6 are integrally formed. This facilitates integral processing.

[0040] In some embodiments, the height of the inner sealing ring 3 is greater than the depth of the inner groove 21, and the height of the outer sealing ring 4 is greater than the depth of the outer groove 23. This allows both the inner sealing ring 3 and the outer sealing ring 4 to be compressed, improving the sealing effect.

[0041] like Figure 1 As shown, fuel cells in other embodiments of the present invention include the sealing structure 100 described above. The sealing structure 100 can improve the sealing between the fuel cell distribution manifold 1 and the stack end plate 2.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A sealing structure for sealing between a distribution manifold and a fuel cell stack end plate, wherein the surface of the fuel cell stack end plate near the distribution manifold has an inner groove, a communicating groove, an outer groove, and a positioning groove, the inner grooves being spaced apart in the outer grooves, a plurality of communicating grooves being provided, the two ends of the communicating grooves being respectively connected to the inner grooves and the outer grooves, and the positioning grooves being connected to the outer wall of the outer grooves and communicating with the outer grooves, characterized in that, include: Inner sealing ring; An outer sealing ring is spaced apart on the outer periphery of the inner sealing ring; A positioning strip is provided on the outer wall of the outer sealing ring; as well as Multiple connecting strips, the two ends of which are respectively connected to the outer wall of the inner sealing ring and the inner wall of the outer sealing ring; The inner sealing ring is installed in the inner groove, the outer sealing ring is installed in the outer groove, the connecting strips are installed in the connecting grooves, and the positioning strips are installed in the positioning grooves.

2. The sealing structure according to claim 1, characterized in that, Both the inner and outer sealing rings are rectangular in shape.

3. The sealing structure according to claim 1, characterized in that, The ratio of the height to the width of the inner sealing ring is greater than 2.

4. The sealing structure according to claim 1, characterized in that, The width-to-height ratio of the outer sealing ring is greater than 1.

5.

5. The sealing structure according to any one of claims 1-4, characterized in that, The width of the outer sealing ring is greater than twice the width of the inner sealing ring.

6. The sealing structure according to claim 1, characterized in that, The height of the inner sealing ring is greater than the height of the outer sealing ring.

7. The sealing structure according to claim 1, characterized in that, The inner sealing ring, the outer sealing ring, the positioning strip, and the connecting strip are integrally formed.

8. The sealing structure according to claim 1, characterized in that, The height of the inner sealing ring is greater than the depth of the inner groove, and the height of the outer sealing ring is greater than the depth of the outer groove.

9. A fuel cell, characterized in that, Including the sealing structure as described in any one of claims 1-8.

Images