Front end plate assembly of fuel cell stack

Abstract

The invention discloses a front end plate assembly of a fuel cell stack, and the front end plate assembly comprises a front end plate which is provided with a first surface and a plurality of connecting holes penetrating through the front end plate, the first surface is provided with a plurality of drainage grooves, and each connecting hole is communicated with one drainage groove; the drainage groove comprises an annular groove formed in the periphery of the opening, located in the first surface, of the connecting hole and a communicating groove extending to the edge of the first surface from the annular groove. The fluid distribution plate is provided with a plurality of protruding parts, each protruding part is connected with one connecting hole in an inserted mode, each protruding part is provided with a through hole, and the through holes are used for gas or liquid to enter and exit; the insulating plate is arranged on the side, away from the front end plate, of the fluid distribution plate, a plurality of through holes are formed in the insulating plate, and each through hole is communicated with one penetrating hole. According to the front end plate assembly of the fuel cell stack, the creepage distance between the front end plate and the protruding part can be increased, and the resistance between the front end plate and the protruding part is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a front end plate assembly of a fuel cell stack. Background Art

[0002] A proton exchange membrane fuel cell is an electrochemical device that uses a catalyst to decompose hydrogen at the anode into protons and electrons. The protons reach the cathode through the proton exchange membrane, and the electrons reach the cathode through an external circuit. The electrons, protons and oxygen generate water under the catalysis of the cathode catalyst. It has the advantages of high efficiency, low temperature, cleanliness and environmental protection.

[0003] In the structure of the existing proton exchange membrane fuel cell, a hole is opened on the front end plate, and a raised portion on the insulating component is inserted into the hole on the front end plate and connected to an external inlet pipe interface. Water is easily retained between the hole on the front end plate and the raised portion on the insulating component, thereby causing the resistance between the front end plate and the raised portion of the insulating component to decrease, resulting in poor insulation performance.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a front end plate assembly of a fuel cell stack, which can increase the creepage distance between the front end plate and the protrusion and increase the resistance between the two.

[0006] In order to achieve the above-mentioned purpose, a technical solution provided by a specific embodiment of the present invention is as follows: A front end plate assembly of a fuel cell stack comprises:

[0007] A front end plate, comprising a first surface, and a plurality of connection holes provided from the first surface through the front end plate, a plurality of drainage grooves are also provided on the first surface, each of the connection holes is connected to a drainage groove, and the drainage grooves include an annular groove formed on the outer periphery of the opening of the connection hole on the first surface, and a connecting groove extending from the annular groove to the edge of the first surface;

[0008] A fluid distribution plate, having a plurality of protrusions thereon, each of which is plugged into a connection hole, each of which is provided with a through hole, the through hole being arranged through the fluid distribution plate, and the through hole being used for gas or liquid to enter and exit;

[0009] The insulating plate is arranged on a side of the fluid distribution plate away from the front end plate. The insulating plate is provided with a plurality of through holes, and each of the through holes is respectively connected with a through hole.

[0010] In one or more embodiments of the present invention, the number of the connecting holes is six, and the six connecting holes are respectively a first air inlet hole, a first air outlet hole, a first coolant inlet hole, a first coolant outlet hole, a first hydrogen inlet hole, and a first hydrogen outlet hole;

[0011] The number of the through holes is six, and the six through holes are respectively a second air inlet hole corresponding to the first air inlet hole, a second air outlet hole corresponding to the first air outlet hole, a second coolant inlet hole corresponding to the first coolant inlet hole, a second coolant outlet hole corresponding to the first coolant outlet hole, a second hydrogen inlet hole corresponding to the first hydrogen inlet hole, and a second hydrogen outlet hole corresponding to the first hydrogen outlet hole;

[0012] The number of the through holes is six, and the six through holes are respectively a third air inlet hole connected to the second air inlet hole, a third air outlet hole connected to the second air outlet hole, a third coolant inlet hole connected to the second coolant inlet hole, a third coolant outlet hole connected to the second coolant outlet hole, a third hydrogen inlet hole connected to the second hydrogen inlet hole, and a third hydrogen outlet hole connected to the second hydrogen outlet hole.

[0013] In one or more embodiments of the present invention, the second coolant inlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, and the second coolant outlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate.

[0014] In one or more embodiments of the present invention, the third coolant inlet hole and the third coolant outlet hole are respectively arranged at the edges of the opposite sides of the insulating plate, and a first transition groove connected to the third coolant inlet hole and a second transition groove connected to the third coolant outlet hole are provided on the side of the fluid distribution plate facing the insulating plate. The third coolant inlet hole is connected to the second coolant inlet hole through the first transition groove, and the third coolant outlet hole is connected to the second coolant outlet hole through the second transition groove.

[0015] In one or more embodiments of the present invention, the fluid distribution plate is provided with a first guide plate located in the first transition groove for guiding the liquid in the first transition groove, and the fluid distribution plate is provided with a second guide plate located in the second transition groove for guiding the liquid in the second transition groove.

[0016] In one or more embodiments of the present invention, the second hydrogen inlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, the second hydrogen outlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, the third hydrogen inlet hole and the third hydrogen outlet hole are respectively arranged at two opposite corners of the insulating plate, and a third transition groove connected to the third hydrogen inlet hole and a fourth transition groove connected to the third hydrogen outlet hole are provided on the side of the fluid distribution plate facing the insulating plate, the third hydrogen inlet hole is connected to the second hydrogen inlet hole through the third transition groove, and the third hydrogen outlet hole is connected to the second hydrogen outlet hole through the fourth transition groove.

[0017] In one or more embodiments of the present invention, a seal is clamped between the fluid distribution plate and the insulating plate, and the seal includes six sealing parts, which are respectively arranged around the opening periphery of the first air inlet, the first air outlet, the first transition groove, the second transition groove, the third transition groove and the fourth transition groove.

[0018] In one or more embodiments of the present invention, a plurality of first sealing rings are clamped and sealed between the front end plate and the fluid distribution plate, and the plurality of first sealing rings are respectively arranged around the peripheries of a plurality of protrusions.

[0019] In one or more embodiments of the present invention, a groove surrounding the through hole on each protrusion is provided on a side of each protrusion facing away from the insulating plate, and a second sealing ring is accommodated in each of the grooves.

[0020] In one or more embodiments of the present invention, a current collecting plate is embedded on the side of the insulating plate facing away from the fluid distribution plate.

[0021] Compared with the prior art, the front end plate assembly of the fuel cell stack of the present invention has an annular groove opened on the outer periphery of the opening of the connecting hole, and a connecting groove extending from the annular groove to the edge of the first surface. The annular groove and the connecting groove form a drainage groove to discharge water around the opening of the connecting hole, thereby avoiding the problem of water accumulation between the opening of the connecting hole and the raised portion causing the resistance between the fluid distribution plate and the front end plate to decrease. In addition, due to the annular groove opened on the outer periphery of the opening of the connecting hole, the creepage distance between the fluid distribution plate and the front end plate can also be increased, thereby further increasing the resistance between the fluid distribution plate and the front end plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 An exploded view of a front end plate assembly of a fuel cell stack according to an embodiment of the present invention;

[0024] Figure 2 A three-dimensional diagram of a front end plate in one embodiment of the present invention;

[0025] Figure 3 A three-dimensional diagram of a fluid distribution plate in one embodiment of the present invention;

[0026] Figure 4 A three-dimensional diagram of a fluid distribution plate in one embodiment of the present invention;

[0027] Figure 5 A front view of a front plate assembly of a fuel cell stack according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0029] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0030] Description of main reference numerals:

[0031] 1. front end plate; 11. first surface; 12. drainage groove; 121. annular groove; 122. connecting groove; 13. first air inlet hole; 14. first air outlet hole; 15. first coolant inlet hole; 16. first coolant outlet hole; 17. first hydrogen inlet hole; 18. first hydrogen outlet hole; 2. fluid distribution plate; 21. raised portion; 22. second air inlet hole; 23. second air outlet hole; 24. second coolant inlet hole; 241. first transition groove; 242. first guide plate; 25. second coolant outlet hole; 251, second transition groove; 252, second guide plate; 26, second hydrogen inlet hole; 261, third transition groove; 27, second hydrogen outlet hole; 271, fourth transition groove; 28, groove; 3, insulating plate; 31, third air inlet hole; 32, third air outlet hole; 33, third coolant inlet hole; 34, third coolant outlet hole; 35, third hydrogen inlet hole; 36, third hydrogen outlet hole; 4, sealing member; 41, sealing part; 5, first sealing ring; 6, second sealing ring; 7, collector plate. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] like Figures 1 to 7 As shown, the front end plate assembly of the fuel cell stack in an embodiment of the present invention includes a front end plate 1, a fluid distribution plate 2 and an insulating plate 3; the front end plate 1 has a first surface 11, and a plurality of connecting holes arranged from the first surface 11 through the front end plate 1, and a plurality of drainage grooves 12 are also arranged on the first surface 11, each connecting hole is connected to a drainage groove 12, and the drainage groove 12 includes an annular groove 121 formed on the outer periphery of the opening of the connecting hole on the first surface 11, and a connecting groove 122 extending from the annular groove 121 to the edge of the first surface 11; the fluid distribution plate 2 has a plurality of protrusions 21, each protrusion 21 is respectively plugged into a connecting hole, and each protrusion 21 is provided with a through hole, which is arranged through the fluid distribution plate 2, and is used for gas or liquid to enter and exit; the insulating plate 3 is arranged on the side of the fluid distribution plate 2 away from the front end plate 1, and the insulating plate 3 is provided with a plurality of through holes, each through hole is respectively connected to a through hole.

[0034] The material of the front end plate 1 is aluminum alloy, stainless steel and steel, among which the surface treatment of the aluminum alloy material adopts sandblasting and anodizing, and the surface treatment of the steel adopts spray painting, baking varnish and electrophoresis, etc.; the materials of the fluid distribution plate 2 and the insulating plate 3 are PPS (polyphenylene sulfide), PA9T (a kind of polyamide material), PA6T (polyhexamethylene terephthalamide), PA66 (polyhexamethylene adipamide) + 30% glass fiber, ABS (a terpolymer of three monomers of acrylonitrile (A), butadiene (B) and styrene (S)), CPVC (chlorinated polyvinyl chloride) and PP (polypropylene) insulating materials, etc.

[0035] Preferably, the width of the annular groove 121 and the connecting groove 122 is 0.5-20 mm, and the depth of the annular groove 121 and the connecting groove 122 is 0.1-20 mm.

[0036] like Figure 7 As shown, the distance between the water-containing interface and the conductor surface in the present invention is the creepage distance, and the creepage distance is l 1 and l 2 The length and. The creepage distance in the prior art is l 1Therefore, the drainage groove 12 of the present invention can increase the creepage distance and prevent water from penetrating between the front end plate 1 and the fluid distribution plate 2, effectively improving the insulation properties of the battery stack (also called the battery stack). The connecting groove 122 serves to discharge the coolant in the annular groove 121 to the outside of the first surface 11.

[0037] like Figures 1 to 5 In the illustrated embodiment, there are six connecting holes, which are respectively a first air inlet hole 13 , a first air outlet hole 14 , a first coolant inlet hole 15 , a first coolant outlet hole 16 , a first hydrogen inlet hole 17 and a first hydrogen outlet hole 18 .

[0038] There are six through holes, which are respectively a second air inlet hole 22 corresponding to the first air inlet hole 13, a second air outlet hole 23 corresponding to the first air outlet hole 14, a second coolant inlet hole 24 corresponding to the first coolant inlet hole 15, a second coolant outlet hole 25 corresponding to the first coolant outlet hole 16, a second hydrogen inlet hole 26 corresponding to the first hydrogen inlet hole 17, and a second hydrogen outlet hole 27 corresponding to the first hydrogen outlet hole 18.

[0039] It should be noted that the first air inlet hole 13 is plugged with the protrusion 21 corresponding to the second air inlet hole 22, the first air outlet hole 14 is plugged with the protrusion 21 corresponding to the second air outlet hole 23, the first coolant inlet hole 15 is plugged with the protrusion 21 corresponding to the second coolant inlet hole 24, the first coolant outlet hole 16 is plugged with the protrusion 21 corresponding to the second coolant outlet hole 25, the first hydrogen inlet hole 17 is plugged with the protrusion 21 corresponding to the second hydrogen inlet hole 26, and the first hydrogen outlet hole 18 is plugged with the protrusion 21 corresponding to the second hydrogen outlet hole 27.

[0040] There are six through holes, which are respectively a third air inlet hole 31 connected to the second air inlet hole 22, a third air outlet hole 32 connected to the second air outlet hole 23, a third coolant inlet hole 33 connected to the second coolant inlet hole 24, a third coolant outlet hole 34 connected to the second coolant outlet hole 25, a third hydrogen inlet hole 35 connected to the second hydrogen inlet hole 26, and a third hydrogen outlet hole 36 connected to the second hydrogen outlet hole 27.

[0041] It should be noted that the second air inlet hole 22 can be connected to the external air inlet pipe, and the external air enters the battery stack through the second air inlet hole 22 via the third air inlet hole 31; the second hydrogen inlet hole 26 can be connected to the external hydrogen inlet pipe, and the external hydrogen enters the battery stack through the second hydrogen inlet hole 26 via the third hydrogen inlet hole 35; the second coolant inlet hole 24 can be connected to the external coolant inlet pipe, and the external coolant enters the battery stack through the second coolant inlet hole 24 via the third coolant inlet hole 33 to cool the battery stack.

[0042] The second air outlet 23 can be connected to the external air exhaust pipe, and the air inside the battery stack is discharged to the air exhaust pipe through the third air outlet 32 ​​via the second air outlet 23; the second hydrogen outlet 27 can be connected to the external hydrogen exhaust pipe, and the hydrogen inside the battery stack is discharged to the hydrogen exhaust pipe through the third hydrogen outlet 36 via the second hydrogen outlet 27; the second coolant outlet 25 can be connected to the external coolant exhaust pipe, and the coolant inside the battery stack is discharged to the coolant exhaust pipe through the third coolant outlet 34 via the second coolant outlet 25.

[0043] like Figures 1 to 5 As shown, the second coolant inlet hole 24 and the corresponding protrusion 21 are arranged in the middle of the fluid distribution plate 2, and the second coolant outlet hole 25 and the corresponding protrusion 21 are arranged in the middle of the fluid distribution plate 2. In this way, the second coolant inlet hole 24 and the second coolant outlet hole 25 are arranged in the middle of the fluid distribution plate 2, that is, the first coolant inlet hole 15 and the first coolant outlet hole 16 on the front end plate 1 are also correspondingly arranged in the middle of the front end plate 1, so that the arrangement can have a heat preservation effect on the battery stack core.

[0044] Among them, in a normal temperature environment above 0°C, the coolant can be deionized water, and the temperature of the coolant is 1 to 90°C; in a low temperature environment below 0°C, the coolant can be a common fuel cell-specific antifreeze on the market, and the temperature of the coolant is -40 to 90°C.

[0045] Generally, the third air inlet hole 31, the third coolant inlet hole 33, and the third hydrogen inlet hole 35 are located on one side of the insulating plate 3 near the edge, and the third air outlet hole 32, the third coolant outlet hole 34, and the third hydrogen outlet hole 36 are located on the opposite side of the insulating plate 3 near the edge. However, the second coolant inlet hole 24 and the second coolant outlet hole 25 of the present invention are located in the middle of the fluid distribution plate 2, and the fluid distribution plate 2 and the insulating plate 3 are attached to each other, and it is impossible to use pipes to achieve the communication between the second coolant inlet hole 24 and the third coolant inlet hole 33, and the communication between the second coolant outlet hole 25 and the third coolant outlet hole 34.

[0046] In order to solve the above problems, the present invention provides a first transition groove 241 connected to the third coolant inlet hole 33 and a second transition groove 251 connected to the third coolant outlet hole 34 on the surface of the fluid distribution plate 2 facing the insulating plate 3. The third coolant inlet hole 33 is connected to the second coolant inlet hole 24 through the first transition groove 241, and the third coolant outlet hole 34 is connected to the second coolant outlet hole 25 through the second transition groove 251. In addition, the first transition groove 241 and the second transition groove 251 can also effectively reduce the weight of the fluid distribution plate 2.

[0047] Furthermore, a first guide plate 242 for guiding the liquid in the first transition groove 241 is provided in the first transition groove 241 on the fluid distribution plate 2, and a second guide plate 252 for guiding the liquid in the second transition groove 251 is provided in the second transition groove 251 on the fluid distribution plate 2. The first guide plate 242 and the second guide plate 252 can prevent the turbulence of the fluid in the first transition groove 241 and the second transition groove 251.

[0048] In the prior art, the first air inlet 13, the first coolant inlet 15, and the first hydrogen inlet 17 are located on one side of the front end plate 1 near the edge, and the first air outlet 14, the first coolant outlet 16, and the first hydrogen outlet 18 are located on the opposite side of the front end plate 1 near the edge. In this arrangement, the external air / hydrogen / coolant pipelines are densely arranged on two opposite sides of the front end plate 1, and the middle part of the front end plate 1 generally has no interface, which is not conducive to the arrangement of the system pipeline joints. The second coolant inlet 24 and the second coolant outlet 25 of the present invention are located in the middle part of the fluid distribution plate 2 to alleviate the above problems.

[0049] In order to further solve the above problems, the second hydrogen inlet hole 26 and the corresponding protrusion 21 are arranged in the middle of the fluid distribution plate 2, the second hydrogen outlet hole 27 and the corresponding protrusion 21 are arranged in the middle of the fluid distribution plate 2, the third hydrogen inlet hole 35 and the third hydrogen outlet hole 36 are respectively arranged at two opposite corners on the insulating plate 3, and a third transition groove 261 connected to the third hydrogen inlet hole 35 and a fourth transition groove 271 connected to the third hydrogen outlet hole 36 are provided on the side of the fluid distribution plate 2 facing the insulating plate 3. The third hydrogen inlet hole 35 is connected to the second hydrogen inlet hole 26 through the third transition groove 261, and the third hydrogen outlet hole 36 is connected to the second hydrogen outlet hole 27 through the fourth transition groove 271.

[0050] It is understandable that the above arrangement causes the first coolant inlet hole 15 and the first coolant outlet hole 16 on the front end plate 1 to be correspondingly arranged in the middle of the front end plate 1, thereby avoiding the problem of local dense pipe joints on the front end plate 1 in the prior art.

[0051] like Figure 1 , 6As shown in Figures 7 and 8, a seal 4 is clamped and sealed between the fluid distribution plate 2 and the insulating plate 3. The seal 4 includes six sealing parts 41, and the six sealing parts 41 are respectively arranged around the opening periphery of the first air inlet 13, the first air outlet 14, the first transition groove 241, the second transition groove 251, the third transition groove 261 and the fourth transition groove 271. The sealing parts 41 on the seal 4 effectively ensure the sealing between the fluid distribution plate 2 and the insulating plate 3, and ensure the isolation relationship between the inlet and outlet of each gas or liquid. In addition, a groove for accommodating the seal 4 can be provided on the fluid distribution plate 2 and / or the insulating plate 3, so as to ensure that the fluid distribution plate 2 and the insulating plate 3 can fit tightly.

[0052] Furthermore, a plurality of first sealing rings 5 ​​are clamped and sealed between the front end plate 1 and the fluid distribution plate 2, and the plurality of first sealing rings 5 ​​are respectively arranged around the outer peripheries of the plurality of protrusions 21. The first sealing rings 5 ​​effectively ensure the sealing between the fluid distribution plate 2 and the front end plate 1, and a groove for accommodating the first sealing rings 5 ​​may be provided on the fluid distribution plate 2 and / or the isolation plate, thereby ensuring that the fluid distribution plate 2 and the isolation plate can fit tightly.

[0053] Furthermore, a groove 28 surrounding the through hole on each protrusion 21 is provided on the side facing away from the insulating plate 3, and a second sealing ring 6 is accommodated in each groove 28. The second sealing ring 6 effectively ensures the sealing between the through hole and the external pipe joint, and the groove 28 ensures that the protrusion 21 and the external pipe joint can fit tightly.

[0054] like Figure 1 As shown, a collector plate 7 is embedded on the side of the insulating plate 3 away from the fluid distribution plate 2. The collector plate 7 is used to collect the current generated by the fuel cell stack and transmit it to the DCDC end. The collector plate 7 can be a copper plate, and its material can be red copper T2. The surface treatment method can be nickel plating, gold plating, silver plating, etc.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A front end plate assembly of a fuel cell stack, characterized in that: include: A front end plate, comprising a first surface, and a plurality of connection holes provided from the first surface through the front end plate, a plurality of drainage grooves are also provided on the first surface, each of the connection holes is connected to a drainage groove, and the drainage grooves include an annular groove formed on the outer periphery of the opening of the connection hole on the first surface, and a connecting groove extending from the annular groove to the edge of the first surface; A fluid distribution plate, having a plurality of protrusions thereon, each of which is plugged into a connection hole, each of which is provided with a through hole, the through hole being arranged through the fluid distribution plate, and the through hole being used for gas or liquid to enter and exit; The insulating plate is arranged on a side of the fluid distribution plate away from the front end plate. The insulating plate is provided with a plurality of through holes, and each of the through holes is respectively connected with a through hole.

2. The front end plate assembly of a fuel cell stack according to claim 1, characterized in that: The number of the connecting holes is six, and the six connecting holes are respectively a first air inlet hole, a first air outlet hole, a first coolant inlet hole, a first coolant outlet hole, a first hydrogen inlet hole and a first hydrogen outlet hole; The number of the through holes is six, and the six through holes are respectively a second air inlet hole corresponding to the first air inlet hole, a second air outlet hole corresponding to the first air outlet hole, a second coolant inlet hole corresponding to the first coolant inlet hole, a second coolant outlet hole corresponding to the first coolant outlet hole, a second hydrogen inlet hole corresponding to the first hydrogen inlet hole, and a second hydrogen outlet hole corresponding to the first hydrogen outlet hole; The number of the through holes is six, and the six through holes are respectively a third air inlet hole connected to the second air inlet hole, a third air outlet hole connected to the second air outlet hole, a third coolant inlet hole connected to the second coolant inlet hole, a third coolant outlet hole connected to the second coolant outlet hole, a third hydrogen inlet hole connected to the second hydrogen inlet hole, and a third hydrogen outlet hole connected to the second hydrogen outlet hole.

3. The front end plate assembly of the fuel cell stack according to claim 2, characterized in that: The second coolant inlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, and the second coolant outlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate.

4. The front end plate assembly of the fuel cell stack according to claim 3, characterized in that: The third coolant inlet hole and the third coolant outlet hole are respectively arranged at the edges of the opposite sides of the insulating plate, and a first transition groove connected to the third coolant inlet hole and a second transition groove connected to the third coolant outlet hole are provided on the side of the fluid distribution plate facing the insulating plate. The third coolant inlet hole is connected to the second coolant inlet hole through the first transition groove, and the third coolant outlet hole is connected to the second coolant outlet hole through the second transition groove.

5. The front end plate assembly of the fuel cell stack according to claim 4, characterized in that: The fluid distribution plate is provided with a first guide plate located in the first transition groove for guiding the liquid in the first transition groove, and the fluid distribution plate is provided with a second guide plate located in the second transition groove for guiding the liquid in the second transition groove.

6. The front end plate assembly of a fuel cell stack according to claim 4, characterized in that: The second hydrogen inlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, the second hydrogen outlet hole and the corresponding protrusion are arranged in the middle of the fluid distribution plate, the third hydrogen inlet hole and the third hydrogen outlet hole are respectively arranged at two opposite corners on the insulating plate, and a third transition groove connected to the third hydrogen inlet hole and a fourth transition groove connected to the third hydrogen outlet hole are provided on the side of the fluid distribution plate facing the insulating plate, the third hydrogen inlet hole is connected to the second hydrogen inlet hole through the third transition groove, and the third hydrogen outlet hole is connected to the second hydrogen outlet hole through the fourth transition groove.

7. The front end plate assembly of a fuel cell stack according to claim 6, characterized in that: A seal is clamped between the fluid distribution plate and the insulating plate, and the seal includes six sealing parts, which are respectively arranged around the opening periphery of the first air inlet, the first air outlet, the first transition groove, the second transition groove, the third transition groove and the fourth transition groove.

8. The front end plate assembly of a fuel cell stack according to claim 1, characterized in that: A plurality of first sealing rings are clamped and sealed between the front end plate and the fluid distribution plate, and the plurality of first sealing rings are respectively arranged around the peripheries of the plurality of protrusions.

9. The front end plate assembly of a fuel cell stack according to claim 1, characterized in that: A groove surrounding the through hole on each protrusion is provided on the side of each protrusion facing away from the insulating plate, and a second sealing ring is accommodated in each of the grooves.

10. The front end plate assembly of a fuel cell stack according to claim 1, characterized in that: A current collecting plate is embedded on the side of the insulating plate away from the fluid distribution plate.

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