Electric pile air inlet end plate for fuel cell

Abstract

The utility model discloses an electric pile air inlet end plate for a fuel cell, and relates to the technical field of fuel cells, the electric pile air inlet end plate comprises a first plate, a second plate and a third plate, the first plate is provided with a hollow area, and a sealing groove enclosing the hollow area is arranged outside the hollow area; a mounting hole and a connecting hole are further formed in the first plate; a boss capable of being embedded into the hollow area is arranged on the second plate, and a channel opening for gas-liquid circulation is formed in the boss; the end face, provided with the boss, of the second plate is provided with a locking hole communicated with the mounting hole. The third plate is wrapped on the outer side of the second plate, and a fixing hole communicated with the connecting hole is formed in the third plate. According to the air inlet end plate of the electric pile, the structures of holes of the first plate, the second plate and the third plate are directly connected with the bolts, the air inlet end plate of the electric pile is simple to assemble, the overall structure is high in adaptability, and the structural strength and the bending strength of the air inlet end plate of the electric pile can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an air intake end plate of a stack used for a fuel cell. Background Art

[0002] A hydrogen fuel cell is a power generation device that uses hydrogen as fuel and converts the chemical energy in the fuel cell into electrical energy through electrochemical reactions. The fuel cell stack is mainly composed of bipolar plates, membrane electrodes, current collecting plates, stack air intake end plates, rear end plates, fixed components and other components. Among them, the stack air intake end plate is an important component of the entire stack. It is an intermediate used to connect the stack with external gas and fluid pipelines, and plays the function of receiving and integrating system components.

[0003] At present, the existing fuel cell stack intake end plate is generally a single-layer end plate structure or an insulating layer structure. The single-layer end plate structure is a single-layer end plate structure made of plastic material. This type of fuel cell stack intake end plate is affected by its own material characteristics, and has problems such as poor seismic performance, low mechanical strength, and poor impact resistance. The fuel cell stack intake end plate is prone to bending and warping. The insulating layer structure adopts an end plate structure composed of a metal material fixed skeleton and an injection molded attachment. This type of fuel cell stack intake end plate is limited by the injection molding process. Different specifications of end plate sizes require the development of new molds, and the one-time cost of processing the end plate is high. Moreover, due to the limitation of mold customization, the processing cycle of the end plate is long and the size is not easy to change. In addition, due to the different expansion coefficients of metal materials and plastic materials, the two materials are injection molded together, which easily leads to local stress concentration inside the fuel cell stack intake end plate and other undesirable problems, affecting the normal use of the fuel cell stack intake end plate. Utility Model Content

[0004] The utility model aims to provide a fuel cell stack air intake end plate with high integration, compact structure and high bending strength, which can well improve the reliability, installability and shock resistance of the fuel cell stack.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A fuel cell stack intake end plate, comprising a first plate, a second plate, and a third plate.

[0007] The first plate is provided with a hollow area, and a sealing groove enclosing the hollow area is provided outside the hollow area; the first plate is also provided with a mounting hole for connecting the second plate, and a connecting hole for connecting the third plate;

[0008] The second plate is provided with a boss that can be embedded in the hollow area, and the boss is provided with a channel opening for gas and liquid circulation; the end surface of the second plate provided with the boss is provided with a locking hole connected to the mounting hole;

[0009] The third plate is wrapped around the outer side of the second plate, and a fixing hole communicating with the connecting hole is arranged on the third plate.

[0010] When assembling the intake end plate of the stack, after filling the sealing line in the sealing groove of the first plate, the boss of the second plate is embedded in the hollow area of ​​the first plate, so that the first plate and the second plate are connected and positioned, and the first plate and the second plate are fastened by bolts in conjunction with the locking holes and mounting holes that are interconnected. Afterwards, the third plate is sleeved on the outer periphery of the second plate, so that the third plate wraps the second plate, and then the first plate and the third plate are fastened by bolts in conjunction with the connecting holes and fixing holes that are interconnected. At this point, the first plate, the second plate and the third plate are connected and fastened into an integral structure by bolts, and the intake end plate of the stack is assembled.

[0011] The first plate, the second plate, and the third plate can all be prepared by mechanical processing without the need to open a mold, and the processing cycle and processing cost of the three are lower than those of the insulating layer structure made by the injection molding process. The first plate, the second plate, and the third plate are connected and fixed by their own hole structure and bolts. The three-plate fuel cell stack intake end plate has a high degree of integration and a more compact structure. The third plate wraps the second plate inside, which can protect the second plate with a channel opening and strengthen the structural strength, thereby improving the overall structural strength and bending strength of the fuel cell stack intake end plate, thereby improving the reliability, installability and seismic resistance of the fuel cell stack.

[0012] In one embodiment, an installation chamber sunken in the end face of the first plate is provided on the end face, an opening communicating with the outside is provided on the top of the installation chamber, the hollow area is formed at the bottom of the installation chamber, the second plate is embedded in the installation chamber through the opening, so that the second plate is integrally embedded in the first plate, thereby improving the structural strength between the first plate and the second plate. The third plate surrounds the installation chamber outside and is pressed on the end face of the first plate provided with the installation chamber, so that the circumferential structure of the second plate is completely wrapped by the first plate and the third plate, thereby improving the protective effect of the second plate.

[0013] In one embodiment, the second plate includes a plate body and an extended edge extending toward the outside of the plate body along the circumference of the plate body. When the second plate is embedded in the installation chamber, the extended edge is flush with the end surface of the first plate where the installation chamber is provided, and when the third plate is installed on the first plate, the third plate is pressed on the extended edge, so that the connection between the second plate and the first plate is tighter, and the overall structural strength and bending strength of the fuel cell stack intake end plate are better.

[0014] In one embodiment, a gap is reserved between the outermost edge of the second plate and the inner wall of the installation chamber so that the second plate can be easily embedded in the installation chamber.

[0015] In one embodiment, the third plate is also provided with a mounting groove for fixing the stack tie rods in the circumference so as to facilitate the assembly of the stack air intake end plate and the stack tie rods.

[0016] In one embodiment, a current collecting groove for installing a current collecting plate is provided on the second plate, so that the gas intake end plate of the fuel cell stack can realize the current collecting function. The current collecting groove and the boss are respectively provided at two opposite ends of the second plate.

[0017] In one embodiment, a plurality of packaging through holes for connecting to the stack packaging box are provided on the first plate, so that the stack air intake end plate can be assembled with the stack packaging box.

[0018] In one embodiment, the number of hollow areas is at least two, and the two hollow areas are arranged at intervals on the first plate, and each hollow area is not connected to each other. The number of bosses corresponds to the number of hollow areas, and each boss is embedded in the corresponding hollow area. The number of bosses can be determined according to the requirements of the fuel cell stack intake end plate. The non-connection of each hollow area can ensure the structural strength of the first plate itself, and avoid the hollow area connection causing the local area structure of the first plate to be thin, which affects the rigidity strength of the first plate.

[0019] Compared with the prior art, the stack intake end plate for a fuel cell implemented by the utility model has the following beneficial effects:

[0020] (1) The first plate, the second plate, and the third plate can all be prepared by mechanical processing without the need to open a mold, and the processing cycle and processing cost of the three are lower than those of the insulating layer structure made by the injection molding process; the first plate, the second plate, and the third plate are directly connected with bolts through their own hole structures, the assembly of the fuel cell stack intake end plate is simple, the overall structure has a high degree of coordination, and can effectively improve the structural strength and bending strength of the fuel cell stack intake end plate, thereby improving the reliability, installability and seismic resistance of the fuel cell stack;

[0021] (2) The first plate, the second plate, and the third plate are connected and fixed by means of their own hole structures and bolts, and the stack intake end plate composed of the three has a high degree of integration and a more compact structure;

[0022] (3) The third plate wraps the second plate, which can protect the second plate with the passage opening and enhance the structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded schematic diagram of the fuel cell stack intake end plate in an embodiment of the utility model;

[0024] Figure 2 yes Figure 1A partial enlarged view of middle A;

[0025] Figure 3 It is a schematic diagram of the assembly of the fuel cell stack intake end plate in an embodiment of the utility model.

[0026] In the figure, 1. first plate; 10. mounting chamber; 11. hollow area; 12. sealing groove; 13. mounting hole; 14. connecting hole; 15. packaging through hole; 2. second plate; 20. plate body; 21. extending edge; 22. boss; 23. current collecting mounting groove; 3. third plate; 30. fixing hole; 31. mounting groove; 4. sealing glue line. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present utility model, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be understood that the terms "first" and "second" are used in the present invention for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0031] Example

[0032] like Figure 1-3 As shown, an embodiment of the utility model is a stack intake end plate for a fuel cell, comprising a first plate 1, a second plate 2, and a third plate 3. The first plate 1, the second plate 2, and the third plate 3 are a nested structure. The first plate 1 and the third plate 3 can be made of aluminum alloy material to provide better rigidity and strength, and also facilitate mechanical processing to prepare the first plate 1 and the third plate 3. The second plate 2 can be made of high-strength, high-insulation plastic material, such as PPS+glass fiber material, PEEK and other plastic materials, so that the second plate 2 has sufficient structural strength to facilitate mechanical processing to prepare the second plate 2.

[0033] As shown in the figure, an installation chamber 10 sunken in the end face of the first plate 1 is provided, an opening communicating with the outside is provided at the top of the installation chamber 10, and two hollow areas 11 are provided at the bottom of the installation chamber 10, and the hollow areas 11 connect the two opposite ends of the first plate 1. The two hollow areas 11 are arranged on the first plate 1 at intervals, and each hollow area 11 is not connected to each other, and a sealing groove 12 enclosing the hollow area 11 is provided outside each hollow area 11. In the installation chamber 10, a plurality of installation holes 13 for connecting the second plate 2 are provided on the first plate 1, and the installation holes 13 are distributed on the periphery of the hollow area 11, and on the periphery of the installation chamber 10, a plurality of connection holes 14 for connecting the third plate 3 and a plurality of packaging through holes 15 for connecting with the battery stack packaging box are also provided on the first plate 1, and each through hole is farther away from the location of the installation chamber 10 than each connection hole 14.

[0034] The second plate 2 includes a plate body 20 and an extended edge 21 extending toward the outside of the plate body 20 along the circumference of the plate body 20. A boss 22 is provided at one end of the plate body 20. The number of the bosses 22 corresponds to the number of the hollow areas 11. Each boss 22 is respectively embedded in the corresponding hollow area 11. Each boss 22 is provided with a channel opening for gas and liquid circulation. A current collecting installation groove 23 for installing a current collecting plate is provided at the other end of the plate body 20, so that the current collecting installation groove 23 and the boss 22 are respectively arranged at the two opposite ends of the second plate 2. A locking hole connected to the installation hole 13 is also provided on the end surface of the plate body 20 provided with the boss 22.

[0035] The third plate 3 is annular and wrapped around the outside of the second plate 2. The third plate 3 is provided with a fixing hole 30 connected to the connecting hole 14, and the third plate 3 is also provided with a mounting groove 31 for fixing the stack tie rod in the circumferential direction.

[0036] The assembly process of the fuel cell stack intake end plate of the embodiment of the utility model is as follows:

[0037] After the sealing groove 12 of the first plate 1 is filled with the sealant line 4, the second plate 2 is embedded into the installation chamber 10 through the opening, and the boss 22 is embedded into the hollow area 11 of the first plate 1, so that the extended edge 21 is flush with the end surface of the first plate 1 provided with the installation chamber 10, so as to realize the connection and positioning of the first plate 1 and the second plate 2. A gap with a width of 0.05 to 1 mm can be reserved between the outermost edge of the second plate 2 and the inner wall of the installation chamber 10, so as to facilitate the chimeric assembly of the second plate 2 and the first plate 1.

[0038] The first plate 1 and the second plate 2 are fastened by passing a bolt through the interconnected locking hole and the mounting hole 13. The locking hole can be a threaded hole structure, and the mounting hole 13 can be a through hole structure. The bolt passes through the mounting hole 13 and is screwed into the locking hole to fasten the first plate 1 and the second plate 2.

[0039] The third plate 3 is mounted on the outer periphery of the second plate 2, so that the third plate 3 surrounds the outside of the installation chamber 10 and wraps the second plate 2. At the same time, the third plate 3 is pressed on the end face of the first plate 1 provided with the installation chamber 10 and the extension edge 21. Bolts are passed through the interconnected connecting holes 14 and fixing holes 30, wherein the connecting holes 14 can be threaded hole structures, and the fixing holes 30 can be through-hole structures. Bolts are passed through the fixing holes 30 and screwed into the connecting holes 14 to fasten the first plate 1 and the third plate 3, and the second plate 2 and the third plate 3. At this point, the first plate 1, the second plate 2 and the third plate 3 are connected and fastened into an integral structure by bolts, and the intake end plate of the stack is assembled. By using the packaging through-holes 15 and the mounting grooves 31, the intake end plate of the stack can complete the subsequent installation and assembly with the stack packaging box and the stack pull rods.

[0040] In summary, the embodiment of the utility model provides a fuel cell stack air intake end plate, wherein the first plate 1, the second plate 2, and the third plate 3 can all be prepared by mechanical processing without the need to open a mold, and the processing cycle and processing cost of the three are lower than those of the insulating layer structure made by the injection molding process, and the first plate 1, the second plate 2, and the third plate 3 are connected and fixed by their own hole structures in combination with bolts, and the fuel cell stack air intake end plate composed of the three has a high degree of integration and a more compact structure. In addition, the third plate 3 wraps the second plate 2, which can protect the second plate 2 provided with a channel opening and strengthen the structural strength, thereby improving the overall structural strength and bending strength of the fuel cell stack air intake end plate, and thereby improving the reliability, installability and seismic resistance of the fuel cell stack.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An air intake end plate for a fuel cell stack, characterized in that: comprising a first plate, a second plate, and a third plate; The first plate is provided with a hollow area, and a sealing groove enclosing the hollow area is provided outside the hollow area; the first plate is also provided with a mounting hole for connecting the second plate and a connecting hole for connecting the third plate; The second plate is provided with a boss that can be embedded in the hollow area, and the boss is provided with a channel opening for gas and liquid circulation; the end surface of the second plate provided with the boss is provided with a locking hole connected to the mounting hole; The third plate is wrapped around the outer side of the second plate, and a fixing hole communicating with the connecting hole is provided on the third plate.

2. The fuel cell stack intake end plate according to claim 1, characterized in that: An installation chamber sunken into the end surface is provided on the end surface of the first plate, an opening communicating with the outside is provided on the top of the installation chamber, the hollow area is formed at the bottom of the installation chamber, and the second plate is embedded in the installation chamber through the opening; The third plate surrounds the outside of the installation chamber and is pressed onto the end surface of the first plate where the installation chamber is provided.

3. The fuel cell stack intake end plate according to claim 2, characterized in that: The second plate includes a plate body and an extension edge extending toward the outside of the plate body along the circumference of the plate body; when the second plate is embedded in the installation chamber, the extension edge is flush with the end surface of the first plate where the installation chamber is provided, and when the third plate is installed on the first plate, the third plate is pressed on the extension edge.

4. The fuel cell stack intake end plate according to claim 2, characterized in that: A gap is reserved between the outermost edge of the second plate and the inner wall of the installation chamber.

5. The fuel cell stack intake end plate according to claim 1, characterized in that: The third plate is circumferentially provided with mounting grooves for fixing the stack tie rods.

6. The fuel cell stack intake end plate according to claim 1, characterized in that: The second plate is provided with a current collecting installation groove for installing the current collecting plate.

7. The fuel cell stack intake end plate according to claim 6, characterized in that: The current collecting installation groove and the boss are respectively arranged at two opposite ends of the second plate.

8. The fuel cell stack intake end plate according to claim 1, characterized in that: The first plate is provided with a plurality of packaging through holes for connecting with the battery stack packaging box.

9. The fuel cell stack intake end plate according to claim 1, characterized in that: The number of the hollow areas is at least two, the two hollow areas are arranged at intervals on the first plate, and each of the hollow areas is not connected to each other; the number of the bosses corresponds to the number of the hollow areas one by one, and each of the bosses is embedded in the corresponding hollow area.

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