Bipolar plate of fuel cell and fuel cell with bipolar plate
By processing and cutting transverse cutting grooves on the fuel cell bipolar plate, the fluid flow channels are redistributed, which solves the problems of sealant blockage and complex internal manifold design, improves the performance and service life of the stack, and at the same time reduces the cost of cost.
Patent Information
- Application Number
- CN202411468065.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-01-21
AI Technical Summary
In the existing fuel cell bipolar plate design, sealant causes the runner to be blocked, and the internal manifold design is complex and costly, resulting in a degraded stack performance and shortened service life.
Transverse cutting grooves are processed and cut in the vertical direction where the flow channel ridge of the bipolar plate extends, and the flow channel ridge is opened to connect the adjacent fluid flow channels, thereby redistributing the fluid and avoiding flow channel blockage and uneven fluid distribution.
Through fluid redistribution, fluid loss caused by flow channel blockage is avoided, the stack performance is improved, the service life of the stack is extended, and the complexity of bipolar plate design and production costs are reduced.
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Figure CN119340414A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of fuel cells, and in particular, relates to a fuel cell bipolar plate and a fuel cell having the bipolar plate. Background Art
[0002] A fuel cell is an electrochemical device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction between hydrogen and oxygen under the action of an electrocatalyst. Fuel cells have the characteristics of high energy conversion efficiency, zero carbon emissions, low noise, and green environmental protection. Fuel cells are widely used in transportation and fixed power stations. The key components of fuel cells are mainly composed of membrane electrodes and bipolar plates. The main function of the bipolar plate is to provide a gas flow channel, isolate the reaction gas, prevent hydrogen and oxygen from intermingling, and at the same time conduct the heat of the stack reaction, collect and transfer current, and support the membrane electrode. The stack is formed by stacking multiple groups of single cell components, and the single cell components include an anode bipolar plate, an anode gas diffusion layer, a membrane electrode, a cathode gas diffusion layer, and a cathode bipolar plate. The internal fluid distribution design of the stack currently includes two design methods: an external gas hood manifold and an internal manifold. The external gas cover manifold design means that the stack is covered by an external gas cover on the four sides of the stack, and the sealing area around the gas cover and the four sides of one side of the stack are sealed by sealant. The external gas cover is a part of the stack, and the gas cover provides the stack with a fluid import and export cavity. The internal cavity of the gas cover has a fluid guide manifold. After the external fluid enters the external gas cover of the stack, it is distributed by the guide manifold and then enters the fluid flow channel of the bipolar plate. The bipolar plate flow channel includes an air flow channel, a hydrogen flow channel or a water flow channel. The bipolar plate design does not need to consider the guide distribution function. The internal manifold design means that after the external fluid of the stack enters the stack, the fluid is distributed and collected in the guide area on the bipolar plate, which plays the function of importing and exporting the fluid into the bipolar plate flow channel. The bipolar plate design needs to consider the guide distribution function.
[0003] For the design of the gas hood manifold outside the stack, the hydrogen, air or cooling water required by the fuel cell enters the gas hood cavity of the stack through an external fluid source, and then enters the bipolar plate flow channel after being redistributed inside the gas hood of the stack by the flow diversion design of the internal cavity of the gas hood to provide the reaction gas or cooling water required for the electrochemical reaction for each single cell component inside the stack. The distribution of the reaction gas between the flow channels on the bipolar plate directly affects the performance of the stack. When the gas distribution between the flow channels on the bipolar plate is uneven, the flow channel will be locally lacking in hydrogen or oxygen. The flow channel lacking in hydrogen or oxygen causes the reaction area of the cell to enter the concentration control area of the polarization curve, resulting in a rapid drop in the local voltage, affecting the overall performance of the stack. In particular, in the case of local hydrogen deficiency, the local voltage drops rapidly, and the voltage loss is converted into heat, causing the local temperature of the membrane electrode to be too high, the membrane electrode to dry out or even perforate, and the lack of hydrogen causes local carbon corrosion, which has an irreversible impact on the performance of the single cell, further causing the life of the stack to decay. In addition, when the cooling water is unevenly distributed between the bipolar plate channels, the channels will be partially short of water. The short of water channels can cause the heat generated by the electrochemical reaction in this area to not be removed by the cooling water in time, eventually causing the area to overheat and affecting the life of the membrane electrode. When the stack adopts an external gas hood manifold design, the external gas hood sealing edge and the surface of the stack are bonded by sealant to form a sealed cavity. The sealed cavity provides a flow guide function for the fluid. During the bonding process, the sealant can block part of the fluid flow channel near the sealing edge area due to its fluidity, thereby causing the fluid in the blocked flow channel to be missing. In addition, liquid water will be generated during the electrochemical reaction of the stack. The liquid water will block the gas flow channel on the bipolar plate. If it is not removed in time, the flow channel will be partially short of hydrogen or oxygen, which will also affect the performance and life of the stack.
[0004] Therefore, an effective design method is needed to avoid fluid loss or uneven fluid distribution caused by flow channel blockage, improve the performance of the battery stack, and further extend the service life of the battery stack. At present, for the design of the gas cover manifold outside the battery stack, there is no solution to the blockage of the flow channel by the sealant; at the same time, for the design of the internal manifold, in order to avoid water blockage in the gas flow channel, the bipolar plate design is relatively complex and the manufacturing cost is high. Therefore, a simple, effective and low-cost bipolar plate design needs to be developed. Summary of the invention
[0005] The purpose of the present application is to provide a fuel cell bipolar plate and a fuel cell having the bipolar plate, aiming to solve the problem of blockage of the flow channel by the bipolar plate sealant in the prior art; at the same time, to solve the problem that the internal manifold design of the bipolar plate is relatively complex and the production cost is high in order to avoid the blockage of the bipolar plate flow channel by liquid water.
[0006] In order to achieve the above application purpose, the technical solution adopted in this application is as follows:
[0007] In a first aspect, the present application provides a fuel cell bipolar plate, comprising a fluid region and a sealing region, wherein the fluid region comprises fluid flow channels arranged on any surface of the bipolar plate, wherein there are a plurality of transverse cutting grooves between some or all of the fluid flow channels in a direction perpendicular to the extension of the flow channel ridge.
[0008] In some embodiments, the transverse cut is performed by opening the flow channel ridge to connect one or more adjacent flow channels.
[0009] In some embodiments, the transverse cutting groove is on a channel ridge on one or both sides of the fluid channel.
[0010] In some embodiments, the fluid region further comprises a fluid inlet and a fluid outlet.
[0011] In some embodiments, the sealing area includes a sealing groove disposed on one or more sides of the bipolar plate.
[0012] In some embodiments, the fluid flow channel includes flow channel grooves and flow channel ridges, and the flow channel ridges are used to isolate the flow channel grooves.
[0013] In some embodiments, the depth of the transverse cutting groove is less than or equal to the depth of the flow channel groove.
[0014] In some embodiments, the material of the fuel cell bipolar plate includes any one of graphite, stainless steel, and a composite material.
[0015] In a second aspect, the present application provides a fuel cell, comprising an anode bipolar plate, an anode gas diffusion layer, a membrane electrode, a cathode gas diffusion layer and a cathode bipolar plate; wherein the anode bipolar plate and the cathode bipolar plate are selected from the above-mentioned fuel cell bipolar plates.
[0016] In a third aspect, the present application provides a fuel cell stack, wherein the fuel cell stack is formed by stacking a plurality of groups of the above-mentioned fuel cells.
[0017] The fuel cell bipolar plate provided in the first aspect of the present application mainly processes and cuts grooves in the vertical direction of the bipolar plate flow channel ridge extension, opens the flow channel ridge to connect one or more adjacent fluid flow channels, thereby redistributing the fluid, avoiding the loss of fluid in the flow channel caused by the blockage of the flow channel, improving the performance of the battery stack, and further extending the service life of the battery stack. The bipolar plate for fuel cells provided in the present application is simple in design and low in manufacturing cost, which is conducive to wide application.
[0018] The fuel cell provided in the second aspect of the present application can be widely used because the fuel cell provided includes the above-mentioned bipolar plate, and the above-mentioned bipolar plate can redistribute the fluid to avoid clogging, which is beneficial to improving the electrochemical performance of the fuel cell.
[0019] The fuel cell stack provided in the third aspect of the present application includes the above-mentioned fuel cell, so that the obtained fuel cell has excellent electrochemical performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 It is a schematic diagram of the assembly of the battery stack and the external gas cover provided in an embodiment of the present application;
[0022] Figure 2 It is a schematic diagram of an anode bipolar plate with an external gas cover stack provided in an embodiment of the present application;
[0023] Figure 3 It is a schematic diagram of a top view and a side view of an anode bipolar plate of a stack with an external gas cover provided in an embodiment of the present application;
[0024] Figure 4 It is a partial schematic diagram of a top view of an anode bipolar plate of a stack with an external gas cover provided in an embodiment of the present application;
[0025] Figure 5 It is a schematic diagram of a cathode bipolar plate of a battery stack with an external gas cover provided in an embodiment of the present application;
[0026] Figure 6 It is a schematic diagram of a top view and a side view of a cathode bipolar plate of a stack with an external gas cover provided in an embodiment of the present application;
[0027] Figure 7 It is a partial schematic diagram of a top view of a cathode bipolar plate of a stack with an external gas cover provided in an embodiment of the present application;
[0028] Figure 8 is a schematic diagram of a bipolar plate with an internal manifold provided in an embodiment of the present application;
[0029] Fig. 9 It is a partial schematic diagram of a bipolar plate with an internal manifold provided in an embodiment of the present application. DETAILED DESCRIPTION
[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0031] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.
[0032] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.
[0033] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
[0034] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.
[0035] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.
[0036] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.
[0037] A first aspect of an embodiment of the present application provides a fuel cell bipolar plate, which includes a fluid area and a sealing area, wherein the fluid area includes fluid flow channels arranged on any surface of the bipolar plate, wherein there are several transverse cutting grooves between some or all of the fluid flow channels in the vertical direction of the extension of the flow channel ridge.
[0038] The fuel cell bipolar plate provided in the first aspect of the embodiment of the present application mainly processes and cuts grooves in the vertical direction of the bipolar plate flow channel ridge extension, opens the flow channel ridge to connect one or more adjacent fluid flow channels, thereby redistributing the fluid, avoiding the loss of fluid in the flow channel caused by the blockage of the flow channel, improving the performance of the battery stack, and further extending the service life of the battery stack. The bipolar plate for fuel cells provided by the present application is simple in design and low in manufacturing cost, which is conducive to wide application.
[0039] In some embodiments, the transverse cutting is performed by opening the channel ridge to connect one or more adjacent channels. When a channel is blocked, the fluid in the adjacent channels can flow into the blocked channel through the channel ridge cutting grooves on both sides of the blocked channel to provide the blocked channel with reaction gas or cooling fluid, thereby avoiding the influence of the blocked channel on the fuel cell performance caused by the lack of fluid.
[0040] Furthermore, when a flow channel is partially blocked, causing uneven fluid distribution, the fluid in the adjacent flow channel can flow into the partially blocked flow channel through the flow channel ridge cutting grooves located on both sides of the partially blocked flow channel to provide reaction gas or cooling fluid to the flow channel, thereby avoiding the impact of uneven fluid distribution on fuel cell performance.
[0041] In some embodiments, the transverse cutting groove is on a channel ridge on one or both sides of the fluid channel.
[0042] In some embodiments, there may be one or more transverse cutting grooves on the same flow channel ridge.
[0043] In some embodiments, the fluid region further comprises a fluid inlet and a fluid outlet.
[0044] In some embodiments, the sealing area includes a sealing groove disposed on one or more sides of the bipolar plate.
[0045] In some embodiments, the fluid flow channel includes a flow channel groove and a flow channel ridge, wherein the flow channel ridge is used to isolate the flow channel groove. The flow channel groove provides a channel for fluid flow, and the flow channel ridge provides a support surface for the bipolar plate and isolates the flow channel groove.
[0046] In some embodiments, the depth of the transverse cutting groove is less than or equal to the depth of the flow channel groove.
[0047] In some embodiments, the material of the fuel cell bipolar plate includes any one of graphite, stainless steel, and composite materials. In some specific embodiments, the bipolar plate material is a porous graphite plate.
[0048] In some embodiments, the bipolar plate includes a cathode bipolar plate and an anode bipolar plate. One side of the anode bipolar plate is a hydrogen flow channel, and the other side is a flat plate. One side of the cathode bipolar plate is an air flow channel, and the other side is a cooling water flow channel.
[0049] A second aspect of an embodiment of the present application provides a fuel cell, which includes an anode bipolar plate, an anode gas diffusion layer, a membrane electrode, a cathode gas diffusion layer and a cathode bipolar plate; wherein the anode bipolar plate and the cathode bipolar plate are selected from the above-mentioned fuel cell bipolar plates.
[0050] The fuel cell provided in the second aspect of the embodiment of the present application can be widely used because the provided fuel cell includes the above-mentioned bipolar plate, and the above-mentioned bipolar plate can redistribute the fluid to avoid clogging, which is beneficial to improving the electrochemical performance of the fuel cell.
[0051] A third aspect of an embodiment of the present application provides a fuel cell stack, wherein the fuel cell stack is formed by stacking a plurality of groups of the above-mentioned fuel cells.
[0052] The fuel cell stack provided in the third aspect of the embodiment of the present application includes the above-mentioned fuel cell, so that the obtained fuel cell has excellent electrochemical performance.
[0053] In some specific embodiments, the fluid distribution inside the stack is achieved by an external gas cover design, such as Figure 1 As shown, 3 is the main body of the battery stack, which is composed of a single battery assembly stacked together. The bipolar plate design does not need to consider the diversion and distribution function. The fluid diversion and distribution function is realized by the external gas cover of the battery stack, wherein 1 is the hydrogen external gas cover, 2 is the air / cooling water external gas cover, 4 is the first surface with a bipolar plate fluid flow channel on the surface, and the first surface is the surface providing the flow channel for air / hydrogen / cooling water, 5 is the second surface of the bipolar plate, and the second surface is the air inlet or outlet and the sealing surface of hydrogen, 6 is the third surface of the bipolar plate, and the third surface is the hydrogen inlet or outlet and the sealing surface of air, and 7 is the sealing edge of the external gas cover. The external gas cover covers the second and third surfaces of the battery stack, and the inside of the gas cover and the second or third surface of the battery stack constitute the internal cavity of the gas cover, which provides fluid diversion and distribution for hydrogen / air / cooling water. The gas cover sealing edge 7 of the gas cover 1 and 2 is bonded to the battery stack by sealant, and the gas cover sealing edge 7 provides sealing through the sealing boundary where the gas cover and the battery stack are in contact, so as to prevent the fluid in the internal cavity of the gas cover from leaking to the outside.
[0054] In some specific embodiments, the fluid distribution inside the stack is achieved by designing the bipolar plate flow guide area, such as Figure 8 As shown, the battery stack body is composed of stacked single battery components. The bipolar plate design needs to consider the flow distribution function. 22 is the bipolar plate flow guide area, and the flow guide area can be designed and optimized according to actual conditions.
[0055] The specific embodiments are described below with reference to the accompanying drawings.
[0056] Example 1
[0057] like Figures 2 to 4 As shown, this embodiment provides a design of an anode bipolar plate in a fuel cell using an external gas cover of a stack. The surface has a first surface 4 with a bipolar plate fluid flow channel. After hydrogen is diverted and distributed through a hydrogen external gas cover 1 corresponding to the hydrogen inlet flow channel on the third surface 6 of the bipolar plate, it enters the flow channel from the third surface 6 of the bipolar plate, flows out from the other side of the bipolar plate, and then merges into the hydrogen external gas cover 1 on the hydrogen outflow side of the bipolar plate. The second surface 5 of the bipolar plate is the sealing surface of the hydrogen bipolar plate, and 10 is the sealing area of the hydrogen bipolar plate on the first surface 4, which prevents hydrogen from entering the second surface 5 through the sealing area 10 and avoiding entering the air external gas cover 2 connected to the second surface 5. 9 is the fluid flow channel of the hydrogen bipolar plate, and the flow channel width is 1.3mm. 11 is the flow channel ridge of the hydrogen bipolar plate, and the flow channel ridge width is 1mm. 8 is a groove cut in a direction perpendicular to the extension direction of the hydrogen bipolar plate flow channel ridge, with a groove span of 1.3 mm, and a groove depth consistent with the flow channel depth. In addition to the flow channel ridge adjacent to the bipolar plate sealing area 10, grooves are provided at the flow channel ridges at all flow channel inlets and outlets of the bipolar plate. The grooves are arranged in a zigzag shape in a direction parallel to the third surface 6, and the distances from the grooves to the flow channel openings are alternately distributed at 3.5 mm and 6.2 mm, respectively. The grooves are symmetrically distributed on the bipolar plate with the bipolar plate centerline perpendicular to the second surface 5. The grooves connect one or more fluid flow channels located on both sides of the flow channel ridge.
[0058] In this example, the hydrogen inlet and outlet gas hoods 1 are bonded and sealed on the third surface 6 of the bipolar plate sealing area 10 and the gas hood sealing edge 7 by sealant. Due to the fluidity of the sealant, part of the sealant will enter the flow channel 9 directly adjacent to the bipolar plate sealing area 10, thereby blocking the flow channel opening, and hydrogen cannot enter the flow channel from the flow channel opening. Before the sealant solidifies, the depth of entering the flow channel opening is about 1 mm, which is less than the distance of the flow channel ridge groove from the flow channel opening of 3.5 mm or 6.2 mm. Hydrogen will enter the blocked flow channel in the flow channel opening area from the unblocked flow channel through the flow channel ridge groove, thereby avoiding hydrogen deficiency in the blocked flow channel, further ensuring the stability of the fuel cell performance, and extending the service life of the fuel cell stack.
[0059] Example 2
[0060] like Figures 5 to 7As shown, this embodiment provides a design of a cathode bipolar plate in a fuel cell using an external gas cover of a stack. The surface has a first surface 4 with a bipolar plate fluid flow channel, the air flow channel is on one side of the cathode bipolar plate, and the other side of the cathode bipolar plate is a cooling water flow channel. After the air is diverted and distributed through the air external gas cover 2 corresponding to the air inlet flow channel on the second surface 5 of the bipolar plate, it enters the flow channel from the second surface 5 of the bipolar plate, flows out from the other side of the bipolar plate, and then merges into the air external gas cover 2 on the air outflow side of the bipolar plate. The third surface 6 of the bipolar plate is the sealing surface of the cathode bipolar plate, and 12 is the sealing area of the air bipolar plate on the first surface 4, which prevents air from entering the third surface 6 through the sealing area 12 and avoids entering the hydrogen external gas cover 1 connected to the third surface 6. The air flow channel adopts a finger-shaped cross design, 13 is the air fluid flow channel of the cathode bipolar plate, and the flow channel width is 1.3mm. 15 is the air fluid flow channel ridge of the cathode bipolar plate, and the flow channel ridge width is 1mm. 14 is a groove cut in a direction perpendicular to the extension direction of the cathode bipolar plate flow channel ridge, the groove span is 1.3mm, the groove depth is consistent with the flow channel depth, except for the flow channel ridge adjacent to the bipolar plate sealing area 12, all the flow channel inlet and outlet flow channel ridges of the bipolar plate are provided with grooves, the grooves are arranged in a zigzag shape in the direction parallel to the second surface 5, the distances from the grooves to the flow channel openings are 8mm and 5.75mm respectively, and the grooves are symmetrically distributed on the bipolar plate with the bipolar plate center axis perpendicular to the third surface 6. The grooves connect one or more fluid flow channels located on both sides of the flow channel ridge.
[0061] In this example, the air inlet and outlet hoods 2 are bonded and sealed on the second surface 5 of the bipolar plate sealing area 12 and the hood sealing edge 7 by sealant. Due to the fluidity of the sealant, part of the sealant will enter the flow channel 13 directly adjacent to the bipolar plate sealing area 12, thereby blocking the flow channel opening, and air cannot enter the flow channel from the flow channel opening. Before the sealant solidifies, the depth of entering the flow channel opening is about 1 mm, which is less than the distance of the flow channel ridge groove from the flow channel opening of 8 mm or 5.75 mm. The air will enter the blocked flow channel in the flow channel opening area from the unblocked flow channel through the flow channel ridge groove, thereby avoiding the situation of lack of air in the blocked flow channel, further ensuring the stability of the fuel cell performance and extending the service life of the battery stack.
[0062] Example 3
[0063] like Figures 8 to 9As shown, this embodiment provides a manifold design inside the battery stack, and fluid diversion and distribution are performed through the bipolar plate. This example is designed as an air bipolar plate, and the surrounding of the bipolar plate is a sealing area 16. After the external fluid enters the bipolar plate from the inlet 17, it is distributed in the diversion area 22, and then passes through the flow channel 19, and converges into the diversion area 22 connected to the fluid outlet 18, and finally flows out of the bipolar plate from the outlet 18. 20 is the bipolar plate flow channel ridge, and 21 is a groove cut on the flow channel ridge. The groove span is 0.82mm, and the groove depth is consistent with the flow channel depth. The grooves are distributed in a V-shape near the fluid outlet 18. The grooves connect one or more fluid flow channels located on both sides of the flow channel ridge.
[0064] In this example, air enters the bipolar plate from the inlet 17 and is distributed into the gas flow channel through the guide area 22. If the water generated during the cathode reaction cannot be removed in time, it will gradually accumulate during the flow from the flow channel inlet to the outlet, especially in some flow channel areas close to the flow channel outlet, where water is prone to block the flow channel. Through the design of multiple V-shaped grooves, air will enter the downstream of the blocked flow channel from the unblocked flow channel through the flow channel ridge groove, thereby avoiding the situation of lack of air in the blocked flow channel, further ensuring the stability of the fuel cell performance. At the same time, the design of multiple V-shaped grooves prevents liquid water from accumulating in the flow channel to form a continuous fluid, which is conducive to segmenting the liquid water and removing it from the adjacent gas flow channel through the flow channel ridge groove.
[0065] In summary, the present application provides a design for a bipolar plate for a fuel cell. It solves the problem of blockage of the flow channel due to sealant in the design of the external gas cover of the stack; it also solves the problem of clogging the bipolar plate flow channel with liquid water, and the problem of a relatively complex design of the internal manifold of the bipolar plate and high manufacturing cost. This design cuts grooves in the vertical direction of the bipolar plate flow channel ridge, opens the flow channel ridge to connect one or more adjacent fluid flow channels, thereby redistributing the fluid, avoiding the loss of fluid in the flow channel caused by the blockage of the flow channel, improving the performance of the stack, and further extending the service life of the stack.
[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A fuel cell bipolar plate, characterized in that: The fuel cell bipolar plate includes a fluid area and a sealing area, wherein the fluid area includes fluid flow channels arranged on any surface of the bipolar plate, wherein there are several transverse cutting grooves between some or all of the fluid flow channels in the vertical direction of the extension of the flow channel ridge.
2. The fuel cell bipolar plate according to claim 1, characterized in that: The transverse cutting opens the flow channel ridge to connect one or more adjacent flow channels.
3. The fuel cell bipolar plate according to claim 1, characterized in that: The transverse cutting groove is on the flow channel ridge on one side or both sides of the fluid flow channel.
4. The fuel cell bipolar plate according to claim 1, characterized in that: The fluid region also includes a fluid inlet and a fluid outlet.
5. The fuel cell bipolar plate according to claim 1, characterized in that: The sealing area includes a sealing groove arranged on one or more sides of the bipolar plate.
6. The fuel cell bipolar plate according to claim 1, characterized in that: The fluid flow channel includes a flow channel groove and a flow channel ridge, and the flow channel ridge is used to isolate the flow channel groove.
7. The fuel cell bipolar plate according to claim 6, characterized in that: The depth of the transverse cutting groove is less than or equal to the depth of the flow channel groove.
8. The fuel cell bipolar plate according to claim 1, characterized in that: The material of the fuel cell bipolar plate includes any one of graphite, stainless steel and composite materials.
9. A fuel cell, characterized in that: The fuel cell comprises an anode bipolar plate, an anode gas diffusion layer, a membrane electrode, a cathode gas diffusion layer and a cathode bipolar plate; wherein the anode bipolar plate and the cathode bipolar plate are selected from the fuel cell bipolar plates described in any one of claims 1 to 8.
10. A fuel cell stack, characterized in that: The fuel cell stack is formed by stacking a plurality of fuel cells as described in claim 9.