Sealing structure and bipolar plate

Abstract

The invention relates to the technical field of fuel cells, in particular to a sealing structure and a bipolar plate, the sealing structure comprises an anode sealing element and a cathode sealing element, the anode sealing element and the cathode sealing element are respectively provided with an anode mounting port and a cathode mounting port, and the anode sealing element and the cathode sealing element are hermetically attached to each other. A bipolar plate structure with the peripheral side sealed through the sealing structure is formed, an air cavity and a cooling liquid flow channel are formed between the anode sealing piece and the cathode sealing piece, and due to the fact that the air cavity and the cooling liquid flow channel are arranged in the anode sealing piece and the cathode sealing piece and are separated, water-air mixing of the air cavity and the cooling liquid flow channel can be effectively avoided, and the sealing effect of the bipolar plate is improved. The anode sealing piece and the cathode sealing piece are respectively provided with the anode air hole and the cathode air hole which are communicated with the air cavity, and the anode air hole and the cathode air hole are respectively formed in the anode sealing piece and the cathode sealing piece, so that water-air mixing in the process of leading in anode gas and cathode gas and the process of leading out cooling liquid can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a sealing structure and a bipolar plate. Background Art

[0002] A fuel cell includes a membrane electrode assembly formed of a proton-conducting membrane, an anode is constructed on one side thereof, and a cathode is constructed on the other side thereof. In a fuel cell device, a plurality of fuel cells are usually linearly combined into a fuel cell stack to achieve a sufficiently large power output.

[0003] For example, the bipolar plate disclosed in the patent document with publication number CN219260218U includes a main body, which has a first surface and a second surface in the thickness direction, and a recessed area and an outer frame area are formed on the first surface and the second surface. The recessed area is located in the outer frame area. When in use, the recessed areas on both sides will divide the other layer group structures of the electrolytic cell into an anode cavity and a cathode cavity. The anode gas and the cathode gas can enter the cathode cavity and the anode cavity through the vent holes in the outer frame area, and then an electrolysis reaction occurs in the cathode cavity and the anode cavity.

[0004] Although the existing bipolar plates achieve ventilation to the anode cavity and the cathode cavity through the vents, due to the poor sealing performance of the bipolar plates, water generated during the electrolysis process can easily enter the vents, posing a risk of water and gas cross-talk. Summary of the invention

[0005] In view of this, it is necessary to provide a sealing structure and a bipolar plate to solve the technical problems of poor sealing performance of the bipolar plate structure in the prior art and easy occurrence of water-gas crosstalk.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides a sealing structure, including an anode seal and a cathode seal, wherein the anode seal and the cathode seal are sealed and fitted, and an air cavity and a cooling liquid flow channel are formed between the anode seal and the cathode seal; The anode seal is provided with an anode mounting port and an anode air hole, the anode mounting port is used for mounting the anode flow field plate, the anode air hole is located on a side of the anode seal away from the cathode seal and is communicated with the air cavity; The cathode seal is provided with a cathode installation opening and a cathode air hole. The cathode installation opening is used for installing a cathode flow field plate. The cathode air hole is located on a side of the cathode seal away from the anode seal and is communicated with the air cavity.

[0007] Furthermore, a plurality of the anode gas holes and the cathode gas holes are provided, and the anode gas holes and the cathode gas holes are evenly spaced apart.

[0008] Furthermore, a plurality of evenly spaced anode gas uniforming strips are arranged on a side of the anode seal facing away from the cathode seal, and each of the anode gas holes is respectively arranged between each of the anode gas uniforming strips.

[0009] Furthermore, a plurality of cathode gas uniformity strips with uniform intervals are arranged on a side of the cathode sealing member facing away from the anode sealing member, and each of the cathode gas holes is respectively arranged between each of the cathode gas uniformity strips.

[0010] Furthermore, the air cavity is provided with a plurality of evenly spaced first spacing bars, and each of the first spacing bars divides the air cavity into a plurality of sub-cavities.

[0011] Furthermore, each of the anode gas holes and each of the cathode gas holes are respectively connected to each of the sub-cavities.

[0012] Furthermore, the coolant flow channel is provided with a plurality of second spacer bars which are evenly spaced apart, and each of the second spacer bars divides the coolant flow channel into a plurality of coolant sub-flow channels.

[0013] Furthermore, an anode sealing groove is provided around the anode installation opening, and the anode sealing groove is used for installing the anode flow field plate.

[0014] Furthermore, a cathode sealing groove is provided on the peripheral side of the cathode installation opening, and the cathode sealing groove is used for installing the cathode flow field plate.

[0015] The technical solution of the present invention also provides a bipolar plate, including an anode flow field plate, a cathode flow field plate and the above-mentioned sealing structure, wherein the anode flow field plate is installed at the anode mounting port, the cathode flow field plate is installed at the cathode mounting port, a cooling liquid cavity is formed between the anode flow field plate and the cathode flow field plate, and the cooling liquid cavity is connected to the cooling liquid flow channel.

[0016] Compared with the prior art, the sealing structure and bipolar plate of the present invention have the following beneficial effects: the sealing structure includes an anode seal and a cathode seal, the anode seal and the cathode seal are respectively provided with an anode mounting port and a cathode mounting port, the anode flow field plate can be installed at the anode mounting port to form an anode plate structure, the cathode flow field plate can be installed at the cathode mounting port to form a cathode plate structure, the anode seal and the cathode seal are sealed and fitted to form a bipolar plate structure whose circumferential side is sealed by the sealing structure, the air cavity formed between the anode seal and the cathode seal can accommodate cathode gas and anode gas, the coolant flow channel between the anode seal and the cathode seal can allow coolant to pass through, and since the air cavity and the coolant flow channel are arranged inside the anode seal and the cathode seal and are spaced apart, water and gas cross-talk between the air cavity and the coolant flow channel can be effectively avoided; The anode seal and the cathode seal are respectively provided with an anode gas hole and an anode gas hole connected to the air cavity, and the anode gas hole is located on the side of the anode seal away from the cathode seal, and the cathode gas hole is located on the side of the cathode seal away from the anode seal, so that ventilation between the anode flow field plate and the cathode flow field plate and the air cavity can be achieved. Since the anode gas hole and the anode gas hole are respectively provided on the anode seal and the cathode seal, the anode gas and the cathode gas will pass into or out of the anode flow field plate and the cathode flow field plate through the anode seal and the cathode seal, and the anode flow field plate and the cathode flow field plate are sealed by the anode seal and the cathode seal, so that water vapor crosstalk can be avoided during the process of passing the anode gas and the cathode gas and passing the coolant out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a sealing structure provided by an embodiment of the present invention; Figure 2 is another structural schematic diagram of the sealing structure provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of a bipolar plate provided by an embodiment of the present invention; Figure 4 is a top view of a bipolar plate provided by an embodiment of the present invention; Figure 5 is along Figure 4 Sectional view along line AA; Figure 6 yes Figure 5 A partial enlarged view of the middle A; Figure 7 yes Figure 5 A partial enlarged view of point B in the middle; Figure 8 is along Figure 4 Sectional view of the midline BB; Fig. 9 is along Figure 4 Sectional view of the midline CC.

[0018] Among them, the reference numerals in the figure are: 10—Anode seal 11—Anode mounting port 12—Anode air hole 13—first double-line sealing strip 14—anode uniform gas strip 15—second double-line sealing strip 20—cathode seal 21—cathode mounting port 22—cathode air hole 23 - cathode uniform gas strip 24 - sealing protrusion 30 - cooling liquid flow channel 31 - liquid inlet channel 32 - liquid outlet channel 33 - second spacer 40—air cavity 41—anode air inlet cavity 42—anode air outlet cavity 43 - cathode air inlet cavity 44 - cathode air outlet cavity 45 - first spacer 51 - anode air inlet 52 - anode air outlet 53 - cathode air inlet 54 - cathode gas outlet 55 - liquid inlet 56 - liquid outlet 60—anode flow field plate 61—cooling liquid chamber 70—cathode flow field plate 111—anode sealing groove 121—anode air inlet 122—anode air outlet 211 - cathode sealing groove 221 - cathode air inlet hole 222 - cathode air outlet hole. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0020] The present invention provides a sealing structure and a bipolar plate. The bipolar plate arranges a gas channel and a liquid channel in the sealing structure. The gas channel and the liquid channel are effectively separated by the sealing characteristics of the sealing structure, thereby avoiding water-gas crosstalk in the bipolar plate, thereby solving the technical problem that the sealing performance of the bipolar plate structure in the prior art is poor and water-gas crosstalk is prone to occur.

[0021] In order to achieve the above technical purpose, the technical solution of the present invention provides a sealing structure, such as Figure 1-9 As shown, it includes an anode seal 10 and a cathode seal 20, which are sealed and fitted with each other, and form a cooling liquid flow channel 30 and an air cavity 40 spaced apart from each other with the cathode seal 20; the anode seal 10 is provided with an anode mounting port 11 and an anode air hole 12, the anode mounting port 11 is used for the installation of the anode flow field plate 60, the anode air hole 12 is located on the side of the anode seal 10 away from the cathode seal 20, and is connected to the air cavity 40; the cathode seal 20 is provided with a cathode mounting port 21 and a cathode air hole 22, the cathode mounting port 21 is used for the installation of the cathode flow field plate 70, the cathode air hole 22 is located on the side of the cathode seal 20 away from the anode seal 10, and is connected to the air cavity 40.

[0022] Specifically, the sealing structure includes an anode seal 10 and a cathode seal 20, the anode seal 10 and the cathode seal 20 are respectively provided with an anode mounting port 11 and a cathode mounting port 21, the anode flow field plate 60 can be installed in the anode mounting port 11 to form an anode plate structure, and the cathode flow field plate 70 can be installed in the cathode mounting port 21 to form a cathode plate structure, the anode seal 10 and the cathode seal 20 are sealed and fitted to form a bipolar plate structure whose circumferential side is sealed by the sealing structure, and an air cavity 40 and a coolant flow channel 30 are formed between the anode seal 10 and the cathode seal 20, and the air cavity 40 can accommodate cathode gas and anode gas, and the coolant flow channel 30 is connected with the coolant cavity 61 between the anode flow field plate 60 and the cathode flow field plate 70, so that the coolant can pass through, and since the air cavity 40 and the coolant flow channel 30 are arranged inside the anode seal 10 and the cathode seal 20 and are spaced, the occurrence of water and gas cross-talk between the air cavity 40 and the coolant flow channel 30 can be effectively avoided; The anode seal 10 and the cathode seal 20 are respectively provided with an anode gas hole 12 and an anode gas hole 12 connected to the air cavity 40, and the anode gas hole 12 is located on the side of the anode seal 10 away from the cathode seal 20, and the cathode gas hole 22 is located on the side of the cathode seal 20 away from the anode seal 10, so that the anode flow field plate 60 and the cathode flow field plate 70 can be ventilated with the air cavity 40. Since the anode gas hole 12 and the anode gas hole 12 are respectively provided on the anode seal 10 and the cathode seal 20, the anode gas and the cathode gas will pass into or out of the anode flow field plate 60 and the cathode flow field plate 70 through the anode seal 10 and the cathode seal 20, and the anode flow field plate 60 and the cathode flow field plate 70 are sealed by the anode seal 10 and the cathode seal 20, so that the water gas cross-talk during the process of the anode gas and the cathode gas passing in and the coolant passing out can be avoided.

[0023] In the present embodiment, the anode seal 10 and the cathode seal 20 are made of EPDM or fluororubber, silicone rubber and other materials with a Shore hardness range of 50-70. The sealing structure formed by the above materials enables the mutually fitted parts of the anode seal 10 and the cathode seal 20 to be efficiently sealed. Therefore, the sealing structure formed by the mutual fitting of the anode seal 10 and the cathode seal 20 on the circumferential side of the air cavity 40 and the coolant flow channel 30 can effectively ensure the sealing of the air cavity 40 and the coolant flow, thereby avoiding water-gas cross-talk between the air cavity 40 and the coolant flow channel 30.

[0024] It can be understood that the anode seal 10 and / or the cathode seal 20 can be provided with a groove structure with one side opening on the surface, so that the anode seal 10 and the cathode seal 20 are attached to each other to form the air cavity 40 .

[0025] It can be understood that the anode seal 10 and / or the cathode seal 20 can be provided with an open groove structure at one end on the surface, so that the anode seal 10 and the cathode seal 20 can fit together to form a cooling liquid flow channel 30 with an open end, and the open end can allow the cooling liquid to enter or pass through the cooling liquid cavity 61 of the anode flow field plate 60 and the cathode flow field plate 70.

[0026] In this embodiment, Figure 1-9 As shown, the cooling liquid flow channel 30 includes a liquid inlet flow channel 31 and a liquid outlet flow channel 32, and the air cavity 40 includes an anode air inlet cavity 41, an anode air outlet cavity 42, a cathode air inlet cavity 43 and a cathode air outlet cavity 44. The anode air inlet cavity 41, the cathode air inlet cavity 43 and the liquid inlet flow channel 31 are located at one end of the sealing structure and are spaced apart from each other, and the anode air outlet cavity 42, the cathode air outlet cavity 44 and the liquid outlet flow channel 32 are located at the other end of the sealing structure and are spaced apart from each other. The cavity 43, the cathode gas outlet cavity 44, the liquid inlet channel 31 and the liquid outlet channel 32 are arranged in a sealing structure, which can effectively ensure the mutual spacing and sealing of the anode gas inlet cavity 41, the anode gas outlet cavity 42, the cathode gas inlet cavity 43, the cathode gas outlet cavity 44, the liquid inlet channel 31 and the liquid outlet channel 32, and avoid the water vapor interaction between the anode gas, the cathode gas and the coolant in the anode gas inlet cavity 41, the anode gas outlet cavity 42, the cathode gas inlet cavity 43, the cathode gas outlet cavity 44, the liquid inlet channel 31 and the liquid outlet channel 32.

[0027] In this embodiment, Figure 1-9 As shown, the anode seal 10 and the cathode seal 20 are provided with an anode air inlet 51, an anode air outlet 52, a cathode air inlet 53, a cathode air outlet 54, a liquid inlet 55 and a liquid outlet 56; the anode air inlet 51, the cathode air inlet 53 and the liquid inlet 55 are located at one end of the anode seal 10 and the cathode seal 20 and are respectively connected to the anode air inlet cavity 41, the cathode air inlet cavity 43 and the liquid inlet channel 31, and can respectively allow the anode gas, cathode gas and coolant to pass through the anode air inlet cavity 41, the cathode air inlet cavity 43 and the liquid inlet channel 31; the anode air outlet 52, the cathode air outlet 54 and the liquid outlet 56 are located at the other end of the anode seal 10 and the cathode seal 20 and are respectively connected to the anode air outlet cavity 42, the cathode air outlet cavity 44 and the liquid outlet channel 32, and can respectively allow the anode gas, cathode gas and coolant in the anode air outlet cavity 42, the cathode air outlet cavity 44 and the liquid outlet channel 32 to pass out.

[0028] In this embodiment, Figure 1-9 As shown, the anode gas hole 12 includes an anode gas inlet hole 121 and an anode gas outlet hole 122, the anode gas inlet hole 121 is connected to the anode gas inlet cavity 41, and the anode gas outlet hole 122 is connected to the anode gas outlet cavity 42; the cathode gas hole 22 includes a cathode gas inlet hole 221 and a cathode gas outlet hole 222, the cathode gas inlet hole 221 is connected to the cathode gas inlet cavity 43, and the cathode gas outlet hole 222 is connected to the cathode gas outlet cavity 44.

[0029] Through the above structure, when the bipolar plate is working, the anode gas enters the anode air inlet cavity 41 through the anode air inlet 51, and then enters the outer side of the anode flow field plate 60 through the anode air inlet hole 121 to participate in the fuel cell reaction, and the unreacted gas enters the anode air outlet 52 to enter the anode air outlet cavity 42, and then passes out from the anode air outlet 52; the cathode gas enters the cathode air inlet cavity 43 through the cathode air inlet 53, and then enters the outer side of the cathode flow field plate 70 through the cathode air inlet hole 221 to participate in the fuel cell reaction, and the unreacted gas enters the cathode air outlet cavity 44 through the cathode air outlet 54, and then passes out from the cathode air outlet 54; the coolant enters the liquid inlet channel 31 from the liquid inlet 55, and then enters the cooling liquid cavity 61 between the anode flow field plate 60 and the cathode flow field plate 70 through the liquid inlet channel 31, takes away the heat of the anode flow field plate 60 and the cathode flow field plate 70, cools the fuel cell, and then enters the liquid outlet channel 32, and finally passes out from the liquid outlet 56.

[0030] In the present embodiment, by arranging the anode air inlet cavity 41, the anode air outlet cavity 42, the cathode air inlet cavity 43, the cathode air outlet cavity 44, the liquid inlet channel 31 and the liquid outlet channel 32, the anode air inlet 51, the anode air outlet 52, the cathode air inlet 53, the cathode air outlet 54, the liquid inlet 55, the liquid outlet 56, the anode air inlet hole 121, the anode air outlet hole 122, the cathode air inlet hole 221 and the cathode air outlet hole 222 are all in a sealing structure, it is possible to prevent water vapor from mixing with each other and facilitate the processing of the bipolar plate, thereby reducing the production cost of the bipolar plate.

[0031] In this embodiment, Figure 4-9 As shown, a first double-line sealing strip 13 is provided on one side of the anode seal 10 close to the cathode seal 20, the outer ring of the first double-line sealing strip 13 is located on the circumference of the anode seal 10, the inner ring of the first double-line sealing strip 13 is located on the inner side of the outer ring, and the other part is enclosed at both ends of the anode seal 10 to form two mutually spaced groove structures, the anode seal 10 is attached to the anode seal 10 through the first double-line sealing strip 13, and the two grooves at one end and the cathode seal 20 form an anode air inlet cavity 41 and a cathode air inlet cavity 42. An air cavity 43, a liquid inlet channel 31 is formed between the part between the two trough bodies and the cathode seal 20, an anode air outlet cavity 42 and a cathode air outlet cavity 44 are formed between the two trough bodies at the other end and the cathode seal 20, and a liquid outlet channel 32 is formed between the part between the two trough bodies and the cathode seal 20. The sealing between the anode air inlet cavity 41, the anode air outlet cavity 42, the cathode air inlet cavity 43, the cathode air outlet cavity 44, the liquid inlet channel 31 and the liquid outlet channel 32 can be effectively guaranteed by the fitting seal between the first double-line sealing strip 13 and the cathode seal 20.

[0032] In one embodiment, Figure 1-9As shown, a plurality of anode gas holes 12 and cathode gas holes 22 are provided, and each anode gas hole 12 and each cathode gas hole 22 are evenly spaced. Specifically, by setting the anode gas holes 12 and the cathode gas holes 22 to a plurality of evenly arranged numbers, the anode gas and the cathode gas entering the anode flow field plate 60 and the cathode flow field plate 70 can be uniformly gasified, and the anode gas and the cathode gas can be easily discharged from the anode flow field plate 60 and the cathode flow field plate 70.

[0033] In this embodiment, a plurality of anode gas inlet holes 121 , anode gas outlet holes 122 , cathode gas inlet holes 221 and cathode gas outlet holes 222 are arranged at even intervals.

[0034] In one embodiment, Figure 1-9 As shown, a plurality of evenly spaced anode gas-uniform strips 14 are provided on one side of the anode seal 10 opposite to the cathode seal 20, and each anode gas hole 12 is respectively provided between each anode gas-uniform strip 14. Specifically, the anode gas-uniform strip 14 can prevent diffusion from each anode gas hole 12 to the surrounding side, and the anode gas-uniform strip 14 can be connected with each flow channel of the anode flow field plate 60, thereby ensuring that the gas in each flow channel of the anode flow field plate 60 is uniform.

[0035] In this embodiment, the anode gas uniformizing strip 14 is disposed in the anode gas inlet cavity 41 and the anode gas outlet cavity 42 .

[0036] In one embodiment, Figure 1-9 As shown, a plurality of cathode gas-uniform strips 23 are arranged at even intervals on the side of the cathode seal 20 opposite to the anode seal 10, and each cathode gas hole 22 is arranged between each cathode gas-uniform strip 23. Specifically, the cathode gas-uniform strip 23 can prevent diffusion from each cathode gas hole 22 to the surrounding side, and the cathode gas-uniform strip 23 can be connected with each flow channel of the cathode flow field plate 70, thereby ensuring that the gas in each flow channel of the cathode flow field plate 70 is uniform.

[0037] In this embodiment, the cathode gas uniforming strip 23 is disposed in the cathode gas inlet cavity 43 and the cathode gas outlet cavity 44 .

[0038] In one embodiment, Figure 4-6 As shown in FIG. 9 , the air cavity 40 is provided with a plurality of evenly spaced first spacers 45, and each first spacer 45 divides the air cavity 40 into a plurality of sub-cavities. Specifically, the first spacers 45 can evenly distribute the gas in the air cavity 40 through the formed sub-cavities, thereby ensuring that the gas in each flow channel of the cathode flow field plate 70 is even.

[0039] In this embodiment, Figure 4-6As shown in FIG. 9 , the first spacer bar 45 is disposed in the anode air inlet cavity 41 , the anode air outlet cavity 42 , the cathode air inlet cavity 43 , and the cathode air outlet cavity 44 , and can make the anode gas and the cathode gas in the anode air inlet cavity 41 , the anode air outlet cavity 42 , the cathode air inlet cavity 43 , and the cathode air outlet cavity 44 uniform.

[0040] In this embodiment, Figure 4-6 As shown in FIG. 9 , the height of the first spacer strip 45 is flush with the height of the first double-line sealing strip 13 , and can fit with the inner side surface of the cathode sealing member 20 .

[0041] In one embodiment, Figure 4-6 As shown in Figure 9, each anode gas hole 12 and each cathode gas hole 22 are connected to each sub-cavity. Specifically, the connection between each anode gas hole 12 and each cathode gas hole 22 and each sub-cavity can ensure uniform gas inlet and outlet, thereby ensuring uniform gas in each flow channel of the cathode flow field plate 70.

[0042] In one embodiment, Figure 4-6 As shown in FIG. 9 , the coolant flow channel 30 is provided with a plurality of evenly spaced second spacer bars 33, and each second spacer bar 33 divides the coolant flow channel 30 into a plurality of coolant sub-flow channels. Specifically, each coolant sub-flow channel formed by the separation of each second spacer bar 33 can keep the coolant uniform, so that the coolant can be evenly diffused to all parts of the coolant cavity 61, thereby ensuring the heat dissipation effect of the coolant.

[0043] In this embodiment, Figure 4 , 6 As shown in FIG. 9 , the second spacer bar 33 is disposed in the liquid inlet channel 31 and the liquid outlet channel 32 .

[0044] In this embodiment, the height of the second spacer strip 33 is flush with the height of the first double-line sealing strip 13 , and can fit with the inner side surface of the cathode sealing member 20 .

[0045] In this embodiment, Figure 1-9 As shown, a second double-line sealing strip 15 is provided on one side of the anode seal 10 away from the cathode seal 20 . The second double-line sealing strip 15 is sealed with the adjacent bipolar plate by being attached to the cathode plate of the adjacent bipolar plate.

[0046] In this embodiment, Figure 1-9 As shown, a sealing protrusion 24 is provided on one side of the cathode seal 20 away from the anode seal 10. The sealing protrusion 24 is sealed with the adjacent bipolar plate by fitting with the anode plate of the adjacent bipolar plate, thereby achieving efficient sealing inside the fuel cell.

[0047] In one embodiment, Figure 1-2As shown in FIG. 8 , an anode sealing groove 111 is provided around the anode mounting opening 11, and the anode sealing groove 111 is used for installing the anode flow field plate 60. Specifically, by providing the anode sealing groove 111 around the anode mounting opening 11, the gap between the anode flow field plate 60 and the anode seal 10 can be effectively sealed, thereby preventing the anode gas, the cathode gas and the coolant from being mutually connected through the gap between the anode flow field plate 60 and the anode seal 10, thereby improving the sealing of the bipolar plate.

[0048] In one embodiment, Figure 1-2 As shown in FIG. 8 , a cathode sealing groove 211 is provided on the circumferential side of the cathode installation opening 21, and the cathode sealing groove 211 is used for installing the cathode flow field plate 70. Specifically, by providing the cathode sealing groove 211 on the circumferential side of the cathode installation opening 21, the gap between the cathode flow field plate 70 and the cathode seal 20 can be effectively sealed, thereby preventing the anode gas, cathode gas and coolant from being mutually connected through the gap between the cathode flow field plate 70 and the cathode seal 20, thereby improving the sealing of the bipolar plate.

[0049] like Figure 3-9 As shown, the bipolar plate provided by the embodiment of the present invention includes an anode flow field plate 60, a cathode flow field plate 70 and the above-mentioned sealing structure, the anode flow field plate 60 is installed at the anode mounting port 11, the cathode flow field plate 70 is installed at the cathode mounting port 21, and a cooling liquid cavity 61 is formed between the anode flow field plate 60 and the cathode flow field plate 70, and the cooling liquid cavity 61 is connected to the cooling liquid flow channel 30.

[0050] It can be understood that the bipolar plate of this embodiment can be used in any form of fuel cell, such as a hydrogen fuel cell, a methane fuel cell, etc.

[0051] Specifically, by providing the above-mentioned sealing structure, the bipolar plate can achieve high-precision sealing of the bipolar plate, thereby avoiding the occurrence of water-gas crosstalk during the process of anode gas and cathode gas introduction and coolant discharge.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing structure, characterized in that: It comprises an anode seal and a cathode seal, wherein the anode seal and the cathode seal are sealed and fitted, and an air cavity and a cooling liquid flow channel are formed between the anode seal and the cathode seal; The anode seal is provided with an anode mounting port and an anode air hole, the anode mounting port is used for mounting the anode flow field plate, the anode air hole is located on a side of the anode seal away from the cathode seal and is communicated with the air cavity; The cathode seal is provided with a cathode installation opening and a cathode air hole. The cathode installation opening is used for installing a cathode flow field plate. The cathode air hole is located on a side of the cathode seal away from the anode seal and is communicated with the air cavity.

2. The sealing structure according to claim 1, characterized in that: A plurality of the anode gas holes and the cathode gas holes are provided, and the anode gas holes and the cathode gas holes are evenly spaced.

3. The sealing structure according to claim 2, characterized in that: A plurality of evenly spaced anode gas-distributing strips are arranged on a side of the anode seal facing away from the cathode seal, and each of the anode gas holes is respectively arranged between each of the anode gas-distributing strips.

4. The sealing structure according to claim 2, characterized in that: A plurality of cathode gas-distributing strips with uniform intervals are arranged on a side of the cathode sealing member facing away from the anode sealing member, and each of the cathode gas holes is arranged between each of the cathode gas-distributing strips.

5. The sealing structure according to claim 2, characterized in that: The air cavity is provided with a plurality of evenly spaced first spacing bars, and each of the first spacing bars divides the air cavity into a plurality of sub-cavities.

6. The sealing structure according to claim 5, characterized in that: Each of the anode gas holes and each of the cathode gas holes are respectively communicated with each of the sub-cavities.

7. The sealing structure according to any one of claims 1 to 6, characterized in that: The coolant flow channel is provided with a plurality of second spacer bars which are evenly spaced apart, and each of the second spacer bars divides the coolant flow channel into a plurality of coolant sub-flow channels.

8. The sealing structure according to any one of claims 1 to 6, characterized in that: An anode sealing groove is arranged around the anode installation opening, and the anode sealing groove is used for installing the anode flow field plate.

9. The sealing structure according to any one of claims 1 to 6, characterized in that: A cathode sealing groove is arranged around the cathode installation opening, and the cathode sealing groove is used for installing the cathode flow field plate.

10. A bipolar plate, characterized in that: It comprises an anode flow field plate, a cathode flow field plate and the sealing structure according to any one of claims 1 to 9, wherein the anode flow field plate is installed at the anode mounting port, the cathode flow field plate is installed at the cathode mounting port, a cooling liquid cavity is formed between the anode flow field plate and the cathode flow field plate, and the cooling liquid cavity is connected to the cooling liquid flow channel.

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