A fuel cell and a method of manufacturing a seal structure thereof

Abstract

The application discloses a sealing structure, a fuel cell and a manufacturing method of the sealing structure. The sealing structure comprises a sealing part, a channel part and at least two cavities. The sealing part is used for surrounding a sealing loop. The channel part is connected with the sealing part and is used for at least partially connecting the adjacent two cavities. The channel part comprises at least one supporting part and at least one connecting part. The supporting part is fixedly connected with the connecting part. In the embodiment, the supporting part of the channel part is connected with the sealing part through the connecting part, so that the sealing structure is an integral whole. When the sealing structure is prepared, the sealing structure can be formed only once, the workload of preparing the sealing structure is simplified, and the preparation efficiency of the sealing structure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of proton exchange membrane fuel cell, and particularly to a fuel cell and a manufacturing method of a sealing structure thereof. BACKGROUND

[0002] The bipolar plate of the proton exchange membrane fuel cell mainly serves to transport and conduct fluid of anode and cathode and coolant fluid. The bipolar plate is formed by stacking anode and cathode plates, and sealing is needed for the bipolar plate to avoid fluid leakage.

[0003] The existing sealing structure of the bipolar plate usually adopts a sealing strip and a channel strip arranged independently. The existing sealing structure of the bipolar plate needs to be pasted multiple times, and has the problem of low preparation efficiency. SUMMARY

[0004] The present application provides a fuel cell and a manufacturing method of a sealing structure thereof, to solve the problem of low preparation efficiency of the existing sealing structure of the bipolar plate which needs to be pasted multiple times.

[0005] According to an aspect of the present application, a sealing structure is provided, comprising:

[0006] a sealing part, the sealing part being used to enclose a sealing loop and at least two cavities;

[0007] a channel part, the channel part being connected with the sealing part, and the channel part being used to at least partially conduct adjacent two cavities;

[0008] The channel part comprises at least one support part and at least one connecting part, and the support part is fixedly connected with the connecting part.

[0009] Optionally, the cavities comprise a first cavity and a second cavity;

[0010] The sealing structure comprises oppositely arranged first and second ends;

[0011] The first cavity is arranged at the first end and the second end, respectively;

[0012] The second cavity is arranged between the first cavity at the first end and the first cavity at the second end;

[0013] The channel part at the first end is arranged at a side of the cavity at the first end away from the first end;

[0014] The channel part at the second end is arranged at a side of the cavity at the second end away from the second end.

[0015] Optionally, the channel part at the first end is opposite to or staggered with the channel part at the second end.

[0016] Optionally, the support part comprises at least two support strips, and the support strips extend along a first direction.

[0017] The connecting portion extends along a second direction, and the first direction and the second direction are perpendicular to each other.

[0018] Optionally, the connecting portion comprises a plurality of sub-connecting portions, and each two adjacent support strips are connected by a sub-connecting portion.

[0019] At least part of the sub-connecting portions are located at the opposite ends of the support strips; or,

[0020] Each sub-connecting portion is located at the end of the support strip close to the cavity.

[0021] Optionally, the first direction and the second direction are perpendicular to each other.

[0022] Each support strip is parallel to each other.

[0023] According to another aspect of the present application, a fuel cell is provided, comprising: at least two bipolar plates and a membrane electrode between the bipolar plates;

[0024] The bipolar plate comprises: the sealing structure of any of the above embodiments; and a cathode plate and an anode plate, the sealing structure being arranged between the cathode plate and the anode plate, on the side of the cathode plate away from the anode plate, and on the side of the anode plate away from the cathode plate.

[0025] Optionally, the sealing structure comprises a first sealing structure, a second sealing structure and a third sealing structure.

[0026] The cathode plate and the anode plate each comprise a gas cavity side and a cooling cavity side.

[0027] The cooling cavity side of the cathode plate and the cooling cavity side of the anode plate are connected by the first sealing structure.

[0028] The gas cavity side of the cathode plate is provided with the second sealing structure.

[0029] The gas cavity side of the anode plate is provided with the third sealing structure.

[0030] Optionally, the two ends of the anode plate and the cathode plate are respectively provided with a hydrogen cavity, an air cavity and a cooling cavity.

[0031] The first cavity of the sealing structure is opposite to the hydrogen cavity, the air cavity and the cooling cavity of the anode plate and the cathode plate, and the sealing portion of the sealing structure is used for sealing the hydrogen cavity, the air cavity and the cooling cavity.

[0032] According to another aspect of the present application, a manufacturing method of a sealing structure is provided, comprising:

[0033] A substrate is provided;

[0034] A sealing portion is formed on the substrate, wherein the sealing portion is used for surrounding a sealing loop and at least two cavities.

[0035] The channel part is connected with the sealing part, and the channel part is used for at least partially connecting two adjacent cavities.

[0036] The technical scheme of the embodiment of the present application connects the support part of the channel part with the sealing part through the connecting part, so that the sealing structure is an integral whole, and only one preparation is needed to form the sealing structure, thereby simplifying the workload of preparing the sealing structure and improving the preparation efficiency of the sealing structure.

[0037] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0039] Figure 1 is a structural schematic diagram of a sealing structure provided by the embodiment of the present application;

[0040] Figure 2 is a structural schematic diagram of another sealing structure provided by the embodiment of the present application;

[0041] Figure 3 is a structural schematic diagram of a channel part provided by the embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of another channel part provided by the embodiment of the present application;

[0043] Figure 5 is a structural schematic diagram of a fuel cell provided by the embodiment of the present application;

[0044] Figure 6 is a structural schematic diagram of a cross section of a cathode plate provided by the embodiment of the present application;

[0045] Figure 7 is a structural schematic diagram of a first surface of a cathode plate provided by the embodiment of the present application;

[0046] Figure 8 is a structural schematic diagram of a second surface of a cathode plate provided by the embodiment of the present application;

[0047] Figure 9 is a flow chart of a manufacturing method of a sealing structure provided by an embodiment of the present application.

[0048] In the drawings:

[0049] Sealing part 1, cavity 11, first end 101, second end 102, first cavity 111, second cavity 112, passage part 2, support part 21, support strip 211, connecting part 22, bipolar plate 3, cathode plate 31, anode plate 32, gas cavity side 301, cooling cavity side 302, membrane electrode 4, sealing structure 5, first sealing structure 51, second sealing structure 52, third sealing structure 53, hydrogen cavity 6, air cavity 7, cooling cavity 8. DETAILED DESCRIPTION

[0050] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0051] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0052] The embodiments of the present application provide a sealing structure which can be applied to sealing the bipolar plate of a proton exchange membrane fuel cell. Figure 1 is a structural schematic diagram of a sealing structure provided by an embodiment of the present application, referring to Figure 1 , the sealing structure comprises:

[0053] The sealing part 1 is used to enclose a sealing loop and at least two cavities 11; the passage part 2 is connected with the sealing part 1, and the passage part 2 is used to at least partially guide the adjacent two cavities 11; the passage part 2 comprises at least one support part 21 and at least one connecting part 22, and the support part 21 is fixedly connected with the connecting part 22.

[0054] Specifically, the sealing part 1 can be a sealing strip structure for sealing the bipolar plate. The channel part 2 includes at least one supporting part 21 and at least one connecting part 22, the supporting part 21 can play a role of stable support, and the connecting part 22 is used for connecting the supporting part 21 and the sealing part 1. The channel part 2 can be used to realize the fluid channel function and improve the fluid distribution effect. The supporting part 21 of the channel part 2 is connected to the sealing part 1 through the connecting part 22 to form an integral whole, which can be integrally formed at one time when the sealing structure is prepared, thereby simplifying the process of preparing the sealing structure and improving the efficiency of preparing the sealing structure. The supporting part 21 is connected to the sealing part 1 to play a supporting role after the bipolar plate is assembled, so that the overall structure of the fuel cell is more stable. The channel part 2 protrudes from the edge of the cavity 11, so that the adjacent two cavities 11 are connected. Since the sealing structure has a thickness, the channel part 2 can form a fluid channel, so that the fluid medium flows through the channel part 2 in the adjacent two cavities 11; wherein the supporting part 21 can play a distribution effect.

[0055] The technical scheme of the embodiment, by connecting the supporting part of the channel part to the sealing part through the connecting part, makes the sealing structure an integral whole connected to each other, which can be formed at one time when the sealing structure is prepared, thereby simplifying the workload of preparing the sealing structure and improving the preparation efficiency of the sealing structure.

[0056] Further, continuing to refer to Figure 1 , the cavity 11 includes a first cavity 111 and a second cavity 112; the sealing structure includes a first end 101 and a second end 102 arranged oppositely; the first cavity 111 is arranged at the first end 101 and the second end 102 respectively; the second cavity 112 is arranged between the first cavity 111 at the first end 101 and the first cavity 111 at the second end 102; the channel part 2 at the first end 101 is arranged at a side of the cavity 11 at the first end 101 away from the first end 101; and the channel part 2 at the second end 102 is arranged at a side of the cavity 11 at the second end 102 away from the second end 102.

[0057] Specifically, the first cavity 111 is arranged at the first end 101 and the second end 102 respectively, for sealing the hydrogen cavity, the air cavity and the cooling cavity on the bipolar plate. The second cavity 112 is arranged between the first cavity 111 at the first end 101 and the first cavity 111 at the second end 102, for sealing the flow field on the bipolar plate. The channel part 2 at the first end 101 is arranged at a side of the cavity 11 at the first end 101 away from the first end 101; and the channel part 2 at the second end 102 is arranged at a side of the cavity 11 at the second end 102 away from the second end 102, for providing a fluid channel for the outlet or inlet of the hydrogen cavity, the air cavity and the cooling cavity, and distributing the fluid, so that the fluid flows uniformly into the flow field.

[0058] Figure 2 is a structural schematic diagram of another sealing structure provided by an embodiment of the present application, referring to Figure 1 and Figure 2 The channel part 2 at the first end 101 is opposite or staggered with the channel part 2 at the second end 102.

[0059] Specifically, the channel part 2 at the first end 101 can be opposite or staggered with the channel part 2 at the second end 102, one end of which can be used as the inlet of the fluid, and the other end of which can be used as the outlet of the fluid, for making the fluid flow into the flow field uniformly and fully cover the flow field area, so as to ensure that the electrochemical reaction can be carried out uniformly and fully in the reaction area.

[0060] It should be noted that, Figure 1 shows a case that the channel part 2 at the first end 101 is staggered with the channel part 2 at the second end 102; Figure 2 shows a case that the channel part 2 at the first end 101 is opposite with the channel part 2 at the second end 102.

[0061] Figure 3 is a structural schematic diagram of a channel part provided by an embodiment of the present application, referring to Figure 3 The support part 21 comprises at least two support strips 211, the support strips 211 extend along a first direction M; the connecting part 22 extends along a second direction, the first direction and the second direction intersect with each other.

[0062] Specifically, the support strips 211 are used to provide stable support after the fuel cell is assembled, and to split the fluid, so that the fluid flows into the flow field uniformly; the number of the support strips 211 can be set as needed. The support strips 211 extend along the first direction, and the plurality of support strips 211 can be parallel to each other or not parallel to each other, and the angle of the support strips 211 can be set as needed. The connecting part 22 extends along the second direction, and the angle of the connecting part 22 can be set as needed. The first direction and the second direction intersect with each other, so that the support strips 211 can be connected with the connecting part 22.

[0063] Preferably, the first direction and the second direction are perpendicular to each other; and the support strips 211 are parallel to each other. The support strips 211 being parallel to each other can make the design and preparation of the support strips 211 more convenient; and the first direction and the second direction being perpendicular to each other can make the width of the split channel consistent, facilitate the flow of the fluid, and make the splitting more uniform.

[0064] Further, the connecting part 22 comprises a plurality of sub-connecting parts, each adjacent two support strips 211 are connected by the sub-connecting part; at least part of the sub-connecting parts are located at the opposite ends of the support strips 211; or each sub-connecting part is located at the end of the support strip 211 close to the cavity 11.

[0065] Specifically, the connecting part 22 can include a plurality of sub connecting parts, and the connecting positions of the sub connecting parts can be set as required. Exemplarily, Figure 4 is another structure diagram of a channel part provided by an embodiment of the present application, referring to Figure 4 , part of the sub connecting parts can be located at the opposite end of the support strip 211, that is, part of the sub connecting parts are arranged at one end of the support strip 211, and part of the sub connecting parts are arranged at the other end of the support strip 211; preferably, referring to Figure 3 , each sub connecting part can be arranged at one end of the support strip 211 close to the cavity 11, and the positions of the support strip 211 and the sub connecting parts protrude from the edge of the cavity 11, for forming a fluid channel and realizing fluid distribution, so that the fluid can flow into the flow field uniformly.

[0066] Figure 5 is a structure diagram of a fuel cell provided by an embodiment of the present application, referring to Figure 5 , the fuel cell comprises: at least two bipolar plates 3 and a membrane electrode 4 between the bipolar plates 3; the bipolar plate 3 comprises: the sealing structure in any of the above embodiments; and a cathode plate 31 and an anode plate 32, the sealing structure 5 is arranged between the cathode plate 31 and the anode plate 32, on the side of the cathode plate 31 away from the anode plate 32, and on the side of the anode plate 32 away from the cathode plate 31.

[0067] Specifically, the cathode plate 31 of one bipolar plate 3 is arranged opposite to the anode plate 32 of another bipolar plate 3, the membrane electrode 4 is arranged between the cathode plate 31 of one bipolar plate 3 and the anode plate 32 of another bipolar plate 3, and the membrane electrode 4 is connected with the bipolar plate 3 through the sealing structure 5. Wherein, the bipolar plate 3 can include a graphite bipolar plate and a metal bipolar plate.

[0068] The technical scheme of the embodiment, by pasting the sealing structure formed at one time with the bipolar plate, the bipolar plate is sealed and processed. When the cathode plate and the anode plate are sealed and processed, each sealing structure only needs to be pasted once to realize the sealing of the whole plate, which simplifies the workload of pasting the sealing structure and improves the processing efficiency of the bipolar plate.

[0069] Figure 6 is a structure diagram of a cross section of a cathode plate provided by an embodiment of the present application, Figure 7 is a structure diagram of a first surface of a cathode plate provided by an embodiment of the present application, Figure 8 is a structure diagram of a second surface of a cathode plate provided by an embodiment of the present application; referring to Figures 5-8The sealing structure 5 comprises a first sealing structure 51, a second sealing structure 52 and a third sealing structure 53; the cathode plate 31 and the anode plate 32 each comprise a gas cavity side 301 and a cooling cavity side 302; the cooling cavity side 302 of the cathode plate 31 and the cooling cavity side 302 of the anode plate 32 are connected by the first sealing structure 51; the gas cavity side 301 of the cathode plate 31 is provided with the second sealing structure 52; and the gas cavity side 301 of the anode plate 32 is provided with the third sealing structure 53.

[0070] Specifically, the second sealing structure 52 and the third sealing structure 53 can be gas cavity sealing structures for sealing hydrogen medium or air medium; and the first sealing structure 51 can be a cooling cavity sealing structure for sealing water medium. The cathode plate 31 and the anode plate 32 each comprise a gas cavity side 301 and a cooling cavity side 302, which are a first surface and a second surface of the plate oppositely arranged. The gas cavity side 301 of the cathode plate 31 is used for flowing in air for electrochemical reaction, and the second sealing structure 52 is arranged on the gas cavity side 301 of the cathode plate 31 for sealing air medium. The gas cavity side 301 of the anode plate 32 is used for flowing in hydrogen for electrochemical reaction, and the third sealing structure 53 is arranged on the gas cavity side 301 of the anode plate 32 for sealing hydrogen medium. The cooling cavity side 302 of the cathode plate 31 and the cooling cavity side 302 of the anode plate 32 are oppositely arranged and connected by the first sealing structure 51 for sealing water medium.

[0071] Exemplarily, the graphite bipolar plate further comprises a sealing groove. Since the graphite bipolar plate is relatively smooth, the sealing groove can prevent the sealing structure from sliding after installation and failing to seal the medium. The sealing groove can comprise a gas cavity sealing groove and a cooling cavity sealing groove. The cathode plate and the anode plate of the graphite bipolar plate are each provided with the gas cavity sealing groove and the cooling cavity sealing groove. The compression rate of the sealing structure of the graphite bipolar plate can be calculated according to the compression characteristics of the selected elastomer material, in combination with the required pressure of the sealing medium and the contact pressure of the membrane electrode and the flow field. The required pressure of the sealing medium is the pressure required to seal the medium.

[0072] The resistance of the fuel cell is related to the pressure, and the contact pressure of the membrane electrode and the flow field is the pressure that meets the performance requirements of the fuel cell.

[0073] For example, if the compression rate of the sealing structure is 25%, the thickness of the sealing structure is 25% higher than the depth of the sealing groove. According to the thickness of the single cell being equal to the thickness of the sealing structure of the bipolar plate, the thickness of the sealing structure after compression and the depth of the sealing groove can be calculated. According to the compression rate, the thickness of the sealing structure before compression can be calculated. The thickness of the single cell includes the thickness of the flow field part of the bipolar plate and the thickness of the compressed membrane electrode. The compression rate of the membrane electrode can be obtained from the manufacturer. The sealing structure of the bipolar plate includes a bipolar plate, a sealing structure and a membrane electrode. For example, in some embodiments, the depth of the sealing groove can be the same as the depth of the flow field, and the same knife can be used to facilitate production.

[0074] For example, the metal bipolar plate does not have a sealing groove, and the cathode plate and the anode plate of the metal bipolar plate are separately punched, that is, the gas cavity flow field and the cooling cavity flow field of the cathode plate and the anode plate of the metal bipolar plate are protruded from the edge of the plate. The cooling cavity flow field of the cathode plate and the anode plate of the metal bipolar plate are oppositely arranged, and the distance between the cooling cavity flow field of the cathode plate and the anode plate is the thickness of the cooling cavity sealing structure of the metal bipolar plate after compression. The gas cavity flow field of the metal bipolar plate is connected with the membrane electrode, and the thickness of the gas cavity sealing structure of the metal bipolar plate after compression is determined according to the height of the gas cavity flow field and the thickness of the membrane electrode. According to the compression characteristics of the selected elastomer material, combined with the required pressure of the sealing medium and the contact pressure of the membrane electrode and the flow field, the compression rate of the sealing structure is calculated. According to the compression rate, the thickness of the sealing structure before compression can be calculated.

[0075] Further, continuing to refer to Figures 5-8 The two ends of the anode plate 32 and the cathode plate 31 are respectively provided with a hydrogen cavity 6, an air cavity 7 and a cooling cavity 8; the first cavity 111 of the sealing structure 5 is opposite to the hydrogen cavity 6, the air cavity 7 and the cooling cavity 8 of the anode plate 32 and the cathode plate 31, and the sealing part 1 of the sealing structure 6 is used for sealing the hydrogen cavity 6, the air cavity 7 and the cooling cavity 8.

[0076] Specifically, the two ends of the anode plate 32 and the cathode plate 31 are respectively provided with a hydrogen cavity 6, an air cavity 7 and a cooling cavity 8, one end of which is a fluid inlet of the hydrogen cavity 6, the air cavity 7 or the cooling cavity 8, and the other end is a fluid outlet of the hydrogen cavity 6, the air cavity 7 or the cooling cavity 8.

[0077] The air cavity side 301 of the cathode plate 31 is provided with an air inlet 70 and an air outlet 71 of the air cavity 7, and an air flow field is arranged between the air inlet 70 and the air outlet 71. The air inlet 70, the air outlet 71 and the air flow field are in communication with each other. The air in the air cavity 7 enters the air flow field through the air inlet 70 of the air cavity side 301 of the cathode plate 31, and then flows out through the air outlet 71 of the air cavity side 301 of the cathode plate 31 after electrochemical reaction. The cooling cavity side 302 of the cathode plate 31 is provided with a coolant inlet 80 and a coolant outlet 81 of the cooling cavity 8, and a coolant flow field is arranged between the coolant inlet 80 and the coolant outlet 81. The coolant inlet 80, the coolant outlet 81 and the coolant flow field are in communication with each other. The coolant in the cooling cavity 8 enters the air flow field through the coolant inlet 80 of the cooling cavity side 302 of the cathode plate 31, and then flows out through the coolant outlet 81 of the air cavity side 301 of the cathode plate 31 after electrochemical reaction. The coolant can include water.

[0078] The air cavity side 301 of the cathode plate 31 is provided with an air inlet 70 and an air outlet 71 of the air cavity 7, and an air flow field is arranged between the air inlet 70 and the air outlet 71. The air inlet 70, the air outlet 71 and the air flow field are in communication with each other. The air in the air cavity 7 enters the air flow field through the air inlet 70 of the air cavity side 301 of the cathode plate 31, and then flows out through the air outlet 71 of the air cavity side 301 of the cathode plate 31 after electrochemical reaction. The cooling cavity side 302 of the cathode plate 31 is provided with a coolant inlet 80 and a coolant outlet 81 of the cooling cavity 8, and a coolant flow field is arranged between the coolant inlet 80 and the coolant outlet 81. The coolant inlet 80, the coolant outlet 81 and the coolant flow field are in communication with each other. The coolant in the cooling cavity 8 enters the air flow field through the coolant inlet 80 of the cooling cavity side 302 of the cathode plate 31, and then flows out through the coolant outlet 81 of the air cavity side 301 of the cathode plate 31 after electrochemical reaction. The coolant can include water.

[0079] Figure 9 is a flow chart of a manufacturing method of a sealing structure provided by an embodiment of the present application, referring to Figure 9 , comprising:

[0080] S101, providing a substrate.

[0081] Specifically, a substrate is provided as a substrate for manufacturing the sealing structure, which can be peeled off from the sealing structure after the finished product is manufactured, without any limitation.

[0082] S102, forming a sealing part on the substrate, wherein the sealing part is used to enclose a sealing loop and at least two cavities.

[0083] Specifically, the sealing part is formed on the substrate, which can be processed by die cutting forming, die pressing forming or glue injection forming process; and the sealing part can be made of an elastomer material.

[0084] S103, manufacturing a channel part on the sealing part; wherein the channel part is connected with the sealing part; the channel part is used to at least partially guide the adjacent two cavities; the channel part comprises at least one supporting part and at least one connecting part, and the supporting part is fixedly connected with the connecting part.

[0085] Specifically, the passage part is made on the sealing part, the passage part is connected with the sealing part, the passage part is integrally formed with the sealing part, and the processing mode of the passage part is the same as that of the sealing part. The passage part can be made of an elastomer material, and the passage part and the sealing part can be made of the same material or different materials. Preferably, the passage part and the sealing part are made of the same elastomer material, which facilitates the design of the sealing strip and improves the processing efficiency of the bipolar plate. The passage part includes at least one supporting part and at least one connecting part, the supporting part is fixedly connected with the connecting part, and the supporting part and the connecting part protrude from the edge of the cavity.

[0086] The technical scheme of the embodiment, by connecting the supporting part of the passage part with the sealing part through the connecting part, makes the sealing structure an integral whole connected with each other, and only needs to be prepared once to be formed during the preparation of the sealing structure, thereby simplifying the workload of the preparation of the sealing structure and improving the preparation efficiency of the sealing structure.

[0087] It should be understood that the various forms of the flow shown above can be reordered, added or deleted steps. For example, each step described in the present application can be executed in parallel, sequentially or in different order, as long as the desired results of the technical scheme of the present application can be achieved, which is not limited herein.

[0088] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A fuel cell, characterized in that, The application relates to a fuel cell, which comprises: at least two bipolar plates and a membrane electrode between the bipolar plates; the bipolar plate comprises a sealing structure, a cathode plate and an anode plate, the sealing structure is arranged between the cathode plate and the anode plate, on the side of the cathode plate away from the anode plate and on the side of the anode plate away from the cathode plate; the sealing structure comprises: a sealing part for forming a sealed loop and at least two cavities; a channel part connected with the sealing part, the channel part is used for at least partially connecting two adjacent cavities; the channel part comprises at least one support part and at least one connecting part, the support part is fixedly connected with the connecting part; the support part comprises at least two support strips, the support strips extend along a first direction; the connecting part extends along a second direction, the first direction and the second direction intersect with each other; the connecting part comprises a plurality of sub-connecting parts, each two adjacent support strips are connected through the sub-connecting parts; at least part of the sub-connecting parts are located at the opposite ends of the support strips, or each sub-connecting part is located at the end of the support strip close to the cavity; the sealing structure comprises a first sealing structure, a second sealing structure and a third sealing structure; the cathode plate and the anode plate each comprise a gas cavity side and a cooling cavity side; the cooling cavity side of the cathode plate and the cooling cavity side of the anode plate are connected through the first sealing structure; the gas cavity side of the cathode plate is provided with the second sealing structure; the gas cavity side of the anode plate is provided with the third sealing structure; the first sealing structure comprises two channel parts corresponding to the cooling cavity, the two channel parts are located on the two sides of the coolant flow field, the cooling cavity side of the cathode plate is provided with a coolant inlet and a coolant outlet of the cooling cavity, a coolant flow field is arranged between the coolant inlet and the coolant outlet, and the coolant inlet, the coolant outlet and the coolant flow field are connected with each other; the first sealing structure does not comprise the channel part at positions corresponding to the hydrogen cavity and the air cavity.

2. The fuel cell of claim 1, wherein hydrogen cavities, air cavities and cooling cavities are arranged at the two ends of the anode plate and the cathode plate respectively; the first cavity of the sealing structure is opposite to the hydrogen cavities, the air cavities and the cooling cavities of the anode plate and the cathode plate, and the sealing part of the sealing structure is used for sealing the hydrogen cavities, the air cavities and the cooling cavities.

3. The fuel cell of claim 1, wherein the cavities comprise a first cavity and a second cavity; the sealing structure comprises a first end and a second end arranged oppositely; the first cavity is arranged at the first end and the second end respectively; the second cavity is arranged between the first cavity at the first end and the first cavity at the second end; the channel part at the first end is arranged on the side of the cavity at the first end away from the first end; the channel part at the second end is arranged on the side of the cavity at the second end away from the second end.

4. The fuel cell of claim 3, wherein the channel part at the first end is opposite to or staggered with the channel part at the second end.

5. The fuel cell of claim 1, wherein the first direction and the second direction are perpendicular to each other; each support strip is parallel to each other.

6. A method of manufacturing a seal structure of a fuel cell, characterized by the application further relates to a preparation method of the fuel cell, which comprises the following steps: providing a substrate; Forming a sealing part on the substrate, wherein the sealing part is used to enclose a sealed loop and at least two cavities; Making a channel part on the sealing part; wherein the channel part is connected with the sealing part; the channel part is used to at least partially conduct adjacent two cavities; the channel part comprises at least one support part and at least one connecting part, the support part is fixedly connected with the connecting part; The support part comprises at least two support strips, the support strips extend along a first direction; The connecting part extends along a second direction, the first direction and the second direction intersect with each other; the connecting part comprises a plurality of sub-connecting parts, each adjacent two support strips are connected through the sub-connecting parts; at least part of the sub-connecting parts are located at the opposite ends of the support strips, or each sub-connecting part is located at the end of the support strip close to the cavity; The sealing structure is applied in a fuel cell, the fuel cell comprises: at least two bipolar plates and a membrane electrode between the bipolar plates; The bipolar plate comprises a sealing structure; and a cathode plate and an anode plate, the sealing structure is arranged between the cathode plate and the anode plate, the side of the cathode plate away from the anode plate and the side of the anode plate away from the cathode plate; The sealing structure comprises a first sealing structure, a second sealing structure and a third sealing structure; The cathode plate and the anode plate both comprise a gas cavity side and a cooling cavity side; The cooling cavity side of the cathode plate and the cooling cavity side of the anode plate are connected through the first sealing structure; The gas cavity side of the cathode plate is provided with the second sealing structure; The gas cavity side of the anode plate is provided with the third sealing structure; The first sealing structure comprises two channel parts corresponding to the cooling cavity, the two channel parts are located on both sides of the coolant flow field, the cooling cavity side of the cathode plate is provided with a coolant inlet and a coolant outlet of the cooling cavity, a coolant flow field is arranged between the coolant inlet and the coolant outlet, the coolant inlet, the coolant outlet and the coolant flow field are mutually conducted; The first sealing structure does not comprise the channel part at the positions corresponding to the hydrogen cavity and the air cavity.

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