Fuel cell polar plate and fuel cell stack

Abstract

The application relates to a fuel cell polar plate and a fuel cell stack. The fuel cell polar plate comprises a polar plate body and at least two groups of turbulence components. The polar plate body is provided with a gas flow groove recessed towards the inside of the polar plate body in a first direction, and the gas flow groove penetrates the polar plate body along a second direction. The turbulence components are arranged in the gas flow groove, each group of the turbulence components is arranged at intervals along the second direction and forms a converging flow channel at intervals; wherein each group of the turbulence components comprises at least two turbulence bodies, the turbulence bodies are protruded from the bottom surface of the gas flow groove in the first direction and are arranged to extend along the second direction, and two adjacent turbulence bodies are arranged at intervals along a third direction to form a diverging flow channel, the diverging flow channel is communicated with the converging flow channel; the first direction, the second direction and the third direction are perpendicular to each other. In this way, the gas repeatedly experiences the cycle of "dispersion-convergence" during the flow process, the turbulence degree of the gas flow is enhanced, the gas distribution uniformity is improved, the residence time is prolonged to promote the electrochemical reaction, and the heat dissipation effect is strengthened.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and in particular to fuel cell plates and fuel cell stacks. Background Technology

[0002] During continuous operation, fuel cells generate a constant output of heat from the stack, causing the system temperature to rise. If heat cannot be dissipated in time, this will lead to an increase in the fuel cell system temperature, affecting its performance and lifespan. Therefore, the importance of fuel cell heat dissipation is self-evident. If the fuel cell system cannot dissipate heat in time, the following serious consequences will occur: 1. Reduced fuel cell system efficiency: When operating in a high-temperature environment, the electrochemical reaction rate decreases, limiting the fuel cell's output power and reducing efficiency. 2. Shortened fuel cell system lifespan: Under high temperatures, the materials in the fuel cell system are prone to aging, shortening the fuel cell's lifespan. 3. Safety hazards: If the fuel cell system cannot dissipate heat in time, the internal temperature will continue to rise, potentially causing fires and other safety accidents. Furthermore, the uneven distribution of chemical reactions and current density within the fuel cell stack results in high heat generation in the central region, easily forming "hot spots," while the peripheral regions have lower temperatures, affecting overall performance and lifespan.

[0003] However, when fuel cells are under heavy load, they dissipate heat through high airflow, which carries away a large amount of moisture, causing the proton exchange membrane of the fuel cell to dry out and its performance to degrade. Under light load, the airflow needs to be reduced to retain moisture, which may lead to insufficient heat dissipation and localized overheating. Utility Model Content

[0004] Therefore, it is necessary to provide a fuel cell electrode plate to address the above-mentioned problems.

[0005] A fuel cell electrode plate includes:

[0006] The electrode body has an airflow groove on one side. The airflow groove is recessed towards the interior of the electrode body in a first direction and extends through the electrode body in a second direction.

[0007] At least two sets of flow-disrupting components are disposed within the airflow channel, with each set of components spaced apart along a second direction, such that adjacent sets of components form a converging flow channel; wherein...

[0008] Each set of turbulence components includes at least two turbulence elements. The turbulence elements protrude from the bottom surface of the airflow channel in a first direction and extend along a second direction. Adjacent turbulence elements are arranged at intervals along a third direction, such that the intervals between the two adjacent turbulence elements form a diversion channel, and the diversion channel is connected to the adjacent converging channel.

[0009] The first direction, the second direction, and the third direction are perpendicular to each other.

[0010] The aforementioned fuel cell electrode plate includes an electrode plate body with airflow grooves and at least two sets of turbulence components. Each set of turbulence components consists of multiple turbulent fluids extending along a second direction and spaced apart, forming a flow channel. Adjacent turbulence components form a flow channel. This structure causes the reactant gas to repeatedly undergo a "dispersion-convergence" cycle during flow, enhancing the degree of airflow turbulence, thereby improving the uniformity of gas distribution, extending the residence time to promote electrochemical reactions, and enhancing the heat dissipation effect, thus taking into account both the reaction efficiency and thermal management requirements of the fuel cell.

[0011] In one embodiment, the turbulent fluid has a turbulent surface on at least one side of its third-direction surface, wherein,

[0012] The turbulence surface includes at least one first turbulence surface segment and at least one second turbulence surface segment, the first turbulence surface segment and the second turbulence surface segment are connected in sequence, the first turbulence surface segment is convex outward in the third direction, and the second turbulence surface segment is concave in the third direction.

[0013] In one embodiment, both sides of the turbulent fluid in the third direction are turbulent surfaces;

[0014] In the turbulence assembly, the first turbulence surface segments of two adjacent turbulence elements are arranged opposite each other in a third direction, and the second turbulence surface segments of two adjacent turbulence elements are arranged opposite each other in a third direction.

[0015] In one embodiment, the surface of the turbulent fluid facing the airflow in the second direction is the frontal surface, which is constructed as an arcuate surface.

[0016] In one embodiment, in two adjacent sets of turbulence components, the central axes of the two adjacent turbulence components are set to coincide.

[0017] In one embodiment, in two adjacent sets of turbulence components, the central axes of the two adjacent turbulence components are offset.

[0018] In one embodiment, the electrode body and the turbulence component are integrally formed.

[0019] In one embodiment, the electrode body has a first vent and a second vent, and in a third direction, the first vent and the second vent are located on both sides of the airflow groove.

[0020] In one embodiment, the electrode body is provided with a weight reduction structure.

[0021] This application further proposes a fuel cell stack, which includes:

[0022] The fuel cell plates in some of the above embodiments. Attached Figure Description

[0023] Figure 1 This is a perspective view of a fuel cell electrode plate according to an embodiment of this application.

[0024] Figure 2 This is a front view of a fuel cell electrode plate according to an embodiment of this application.

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 This is a schematic diagram of the structure of a fuel cell electrode plate according to another embodiment of this application.

[0027] Figure label:

[0028] 100. Fuel cell electrode plate; 1. Electrode plate body; 10. Airflow channel; 2. Baffle assembly; 20. Baffle material; 21. Baffle surface; 211. First baffle surface section; 212. Second baffle surface section; 22. Frontal surface; 201. Merging channel; 202. Diverting channel; 31. First vent; 32. Second vent; 4. Weight reduction structure. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] See Figures 1 to 3 As shown, the fuel cell electrode plate 100 according to this application includes an electrode plate body 1 and at least two sets of flow-disrupting components 2. An airflow groove 10 is provided on one side of the electrode plate body 1, and the airflow groove 10 is located in a first direction (e.g., ...). Figure 1The Z-direction shown can also be understood as the thickness direction of the fuel cell electrode plate 100. The plate is recessed towards the interior of the electrode plate body 1, and the airflow groove 10 extends through the electrode plate body 1 along the second direction, providing a basic channel for airflow (see, for example, [reference needed]). Figure 2 As shown, Figure 2 The arrows shown indicate the direction of airflow.

[0036] The turbulence-disrupting components 2 are disposed within the airflow channel 10, and each group of turbulence-disrupting components 2 is arranged along the second direction (e.g., Figure 1 The Y-direction shown can also be understood as the width direction of the fuel cell electrode plate 100. The components are arranged at intervals, so that adjacent groups of turbulence components 2 form a confluence channel 201. From the structure of a single group of turbulence components 2, it contains at least two turbulence elements 20. These turbulence elements 20 protrude from the bottom surface of the airflow groove 10 along a first direction and extend along a second direction; while adjacent turbulence elements 20 are arranged along a third direction (e.g., ...). Figure 1 The X-axis (i.e., the length direction of the fuel cell electrode plate 100) is kept at a distance, thereby forming a branch channel 202 that is interconnected with the confluence channel 201, thus constructing a "branch-convergence" airflow circulation path.

[0037] Specifically, taking the application of fuel cell electrode plate 100 in fuel cell stack as an example. The fuel cell stack includes multiple fuel cell electrode plates 100, which are stacked in layers, and a proton exchange membrane is sandwiched between two stacked fuel cell electrode plates 100.

[0038] When the fuel cell stack is in operation, air, as the reactant gas and heat dissipation medium, flows along the second direction through the airflow channels 10 of each fuel cell electrode 100 in the fuel cell stack. During this process, the airflow exhibits a regular "dispersion-convergence-redispersion" characteristic: the air first enters the diversion channel 202 of the upstream turbulence component 2, and after being diverted, it collides with the turbulence fluid 20; subsequently, the dispersed airflow reconvers in the downstream converging channel 201, and continues to flow to the more downstream turbulence component 2, and then disperses again into the diversion channel 202 of that group of turbulence components 2.

[0039] Thus, the repeated collisions between the airflow and the turbulent fluid 20 transform the originally ordered laminar flow into disordered turbulent flow. On the one hand, this prolongs the residence time of the air in the electrode plate, allowing the air to be distributed more evenly in the airflow channel 10, thereby providing more sufficient time for the electrochemical reaction to participate. On the other hand, the evenly distributed turbulence can more comprehensively contact the surface of the fuel cell electrode plate 100, efficiently removing the heat generated during the operation of the fuel cell stack, thus balancing reaction efficiency and heat dissipation requirements.

[0040] In summary, the fuel cell electrode plate 100 according to this application includes an electrode plate body 1 with airflow grooves 10 and at least two sets of turbulence components 2. Each set of turbulence components 2 is composed of multiple turbulence fluids 20 extending along a second direction and spaced apart, forming a flow channel 202. Adjacent turbulence components 2 form a flow channel 201. This structure allows the reactant gas to repeatedly undergo a "dispersion-convergence" cycle during the flow process, enhancing the degree of airflow turbulence, thereby improving the uniformity of gas distribution, extending the residence time to promote electrochemical reaction, and enhancing the heat dissipation effect, thus taking into account the reaction efficiency and thermal management requirements of the fuel cell.

[0041] See Figure 3 and Figure 4 As shown, in some embodiments of this application, the disturbing fluid 20 is in a third-party direction (such as...) Figure 3 , Figure 4 At least one side of the surface in the X direction shown is a turbulence surface 21, wherein the turbulence surface 21 includes at least one first turbulence surface segment 211 and at least one second turbulence surface segment 212, the first turbulence surface segment 211 and the second turbulence surface segment 212 are connected in sequence, the first turbulence surface segment 211 is convex in the third direction (X direction), and the second turbulence surface segment 212 is concave in the third direction (X direction).

[0042] Specifically, the turbulence surface 21 includes at least one first turbulence surface segment 211 and at least one second turbulence surface segment 212. The first turbulence surface segment 211 and the second turbulence surface segment 212 are smoothly connected sequentially along the airflow direction (Y direction) to form a continuous curved surface structure. The first turbulence surface segment 211 is convex outward in the third direction (X direction) towards the side furthest from the center of the turbulence fluid 20, while the second turbulence surface segment 212 is concave in the third direction (X direction) towards the side closest to the center of the turbulence fluid 20. This combination of convex and concave shapes can create local pressure change regions when the airflow passes through, both obstructing and diverting the airflow and forming vortices through the concave structure, further enhancing the turbulence of the airflow.

[0043] It should be noted that the number and combination of the first turbulence surface segment 211 and the second turbulence surface segment 212 in the turbulence surface 21 are not limited to a single pair. In practical applications, they can be flexibly adjusted according to the electrode size, airflow rate, and reaction requirements. For example, a three-segment structure of "first turbulence surface segment 211 - second turbulence surface segment 212 - first turbulence surface segment 211" or a four-segment structure of "second turbulence surface segment 212 - first turbulence surface segment 211 - second turbulence surface segment 212 - first turbulence surface segment 211" can be set. The multi-segment combination allows the airflow to undergo multiple "compression-expansion" cycles when flowing through the turbulence fluid 20, continuously disrupting the stable flow state of the airflow and avoiding the problem of local airflow velocity uniformity.

[0044] At the same time, in the gas along the second direction (such as...) Figure 3 and Figure 4 In the Y-direction flow direction shown in the diagram, the arrangement order of the first turbulence surface segment 211 and the second turbulence surface segment 212 is not fixed. They can be arranged with the first turbulence surface segment 211 on the upstream side and the second turbulence surface segment 212 on the downstream side, allowing the airflow to first be initially diverted by the obstruction of the convex surface, and then guided by the concave surface to form a vortex. Alternatively, depending on the actual airflow introduction requirements, a reverse arrangement can be used with the second turbulence surface segment 212 on the upstream side and the first turbulence surface segment 211 on the downstream side, allowing the airflow to first enter the low-pressure zone formed by the concave surface for rapid diffusion, and then be compressed by the convex surface to achieve velocity enhancement and secondary diversion. Both arrangements can achieve efficient turbulence through changes in the curvature between the surface segments, differing only in the rhythm control of airflow dispersion and convergence, and can adapt to the response requirements under different operating conditions.

[0045] In summary, this application optimizes the segmented structure of the turbulence surface 21 of the turbulence fluid 20 by flexibly combining and arranging the convex first turbulence surface segment 211 and the concave second turbulence surface segment 212. Based on the original "diversion-convergence" airflow path, it enhances the local turbulence effect, making the flow state of the reaction gas more in line with the dual requirements of electrochemical reaction and thermal management, and further improves the working performance of the fuel cell plate 100 and the entire fuel cell stack.

[0046] See Figure 3 and Figure 4 As shown, in some embodiments of this application, the disturbing fluid 20 is in a third-party direction (such as...) Figure 3 , Figure 4 Both sides of the X-direction shown are constructed as turbulence surfaces 21. Specifically, within any set of turbulence components 2, a flow channel 202 is formed between two adjacent turbulence fluids 20, and the surfaces of these two turbulence fluids 20 that are arranged opposite each other in the third direction (X-direction) are turbulence surfaces 21 with specific curved surface features.

[0047] Furthermore, between two adjacent turbulent fluids 20, the first turbulence surface segment 211 of one turbulent fluid 20 is arranged opposite to the first turbulence surface segment 211 of the adjacent turbulent fluid 20 in the third direction (X direction), and simultaneously, the second turbulence surface segment 212 of one turbulent fluid 20 is arranged opposite to the second turbulence surface segment 212 of the adjacent turbulent fluid 20 in the third direction (X direction). This symmetrical arrangement of "outer convex surface-outer convex surface opposite, inner concave surface-inner concave surface opposite" causes the flow channel 202 between adjacent turbulent fluids 20 to exhibit a regular width variation in the third direction (X direction).

[0048] Specifically, when the airflow flows through the diversion channel 202 along the second direction (Y direction), the first convex structures of the oppositely arranged turbulence surfaces 211 create a local contraction region in the diversion channel 202, exerting a strong compression and acceleration effect on the airflow. Conversely, the concave structures of the second convex structures of the oppositely arranged turbulence surfaces 212 create a local expansion region in the diversion channel 202, providing diffusion space for the airflow and promoting vortex generation. Thus, within a single diversion channel 202, the airflow will sequentially undergo a "contraction-expansion-recontraction" flow process, which not only enhances the collision frequency between the airflow and the two turbulence surfaces 21, but also achieves a more uniform velocity distribution through the symmetrical curved surface structure.

[0049] It should be noted that this symmetrical arrangement makes the interaction between adjacent turbulent flow sections 20 more coordinated. The oppositely arranged first turbulent surface section 211 can simultaneously apply a compressive force towards the center of the flow channel to the airflow, preventing the airflow from deviating to one side; while the oppositely arranged second turbulent surface section 212 together form a more complete low-pressure vortex region, which helps to form a stable turbulent structure in the middle of the split flow channel 202. In this way, the flow field distribution within the split flow channel 202 is further optimized, allowing the reactant gas to achieve sufficient mixing and turbulence during the dispersion stage.

[0050] In summary, by arranging the same type of turbulence surface segments 21 (first turbulence surface segment 211 and second turbulence surface segment 212 and second turbulence surface segment 212) of adjacent turbulence flow 20 relative to each other in the third direction, a flow splitting channel 202 with symmetrical contraction-expansion characteristics is constructed. This further enhances the local turbulence intensity and airflow distribution uniformity within the flow splitting channel 202, allowing the reactant gas to achieve more sufficient disturbance and more uniform diffusion in the "dispersion-convergence" cycle, thereby synergistically improving the electrochemical reaction efficiency and heat dissipation performance of the fuel cell.

[0051] See Figure 3 and Figure 4 As shown, in some embodiments of this application, the surface of the turbulent fluid 20 facing the airflow in the second direction is the frontal surface 22, which is constructed as an arc-shaped surface. By constructing the frontal surface 22 as an arc-shaped surface, the airflow can change its flow direction more smoothly when it impacts the frontal surface 22, reducing the local pressure loss caused by the sudden impact. At the same time, the arc-shaped frontal surface 22 can guide the airflow to smoothly split to both sides along its curved surface, promoting the uniform distribution of airflow within the splitting channel 202.

[0052] See Figure 3 As shown, in some embodiments of this application, in two adjacent sets of turbulence components 2, the turbulence fluid 20 in the upstream turbulence component 2 and the turbulence fluid 20 in the downstream turbulence component 2 are in a third direction (i.e. Figure 1The plates are arranged in a corresponding manner along the X-axis (the length direction of the fuel cell plate 100), and the central axes of two adjacent turbulent fluids 20 coincide along the third direction.

[0053] By aligning the central axes of the corresponding turbulent fluids 20 in two adjacent sets of turbulence components 2, the airflow, after converging in the confluence channel 201, can more smoothly and directly enter the corresponding branching channel 202 of the downstream adjacent turbulence component 2. This axis-aligned arrangement reduces flow resistance and energy loss when the airflow turns from the confluence zone to the branching zone, helping to maintain the overall flow efficiency of the gas in the electrode channel. On the other hand, it allows the mainstream direction of the airflow to maintain better continuity and consistency during the "dispersion-convergence-redispersion" cycle.

[0054] See Figure 4 As shown, in some embodiments of this application, in two adjacent sets of turbulence components 2, the central axes of two adjacent turbulence components 20 are along a third direction (i.e., Figure 1 The fuel cell electrode plates 100 are misaligned in the X-direction (length direction).

[0055] This staggered structural design causes the airflow path to deflect as it flows sequentially through the branch channel 202 and the confluence channel 201 of the upstream turbulence component 2 and enters the branch channel 202 of the downstream turbulence component 2. Specifically, after the airflow exits from the confluence channel 201 of the upstream turbulence component 2, it needs to be redistributed and enter the branch channel 202 of the downstream turbulence component 2. Because the central axes of adjacent turbulence elements 20 are staggered, the airflow cannot maintain its original straight flow trend when entering the downstream branch channel 202. Instead, it needs to change direction and detour into the branch channel 202 between the staggered turbulence elements 20.

[0056] This deflection effect further exacerbates the airflow disturbance, resulting in stronger turbulence within the electrode plate. Its advantages are twofold: firstly, it extends the residence time of the reactant gas within the fuel cell electrode plate 100, leading to a more uniform gas distribution and effectively improving the efficiency and stability of the electrochemical reaction; secondly, it enhances the contact between the airflow and the surface of the fuel cell electrode plate 100, improving the heat dissipation medium's ability to remove heat from the electrode plate surface.

[0057] In summary, by misaligning the central axes of adjacent turbulent fluids 20 in two adjacent sets of turbulence components 2, the deflection and disturbance of the airflow are further increased, and the turbulence effect is enhanced. This not only improves the uniformity of gas distribution and extends the reaction time, but also further enhances the heat dissipation performance, thus ensuring better overall performance of the fuel cell plate 100 in terms of reaction efficiency and thermal management.

[0058] In some embodiments of this application, the electrode body 1 and the turbulence-disrupting component 2 are integrally formed. Designing the electrode body 1 and the turbulence-disrupting component 2 as an integrally formed structure not only enhances the integrity and durability of the fuel cell electrode 100, but also helps to improve manufacturing efficiency, ensure the accuracy of the flow channel morphology, and thus promote the uniform distribution and efficient mass transfer of the reactant gas in the fuel cell electrode 100, while strengthening the thermal management capability.

[0059] See Figure 1 and Figure 2 As shown, in some embodiments of this application, the electrode body 1 has a first vent 31 and a second vent 32. In a third direction, the first vent 31 and the second vent 32 are located on both sides of the airflow groove 10, respectively.

[0060] According to some embodiments of this application, the electrode body 1 of the fuel cell electrode plate 100 is further provided with a first vent 31 and a second vent 32. In a third direction (i.e....) Figure 1 In the X direction (the length direction of the fuel cell electrode 100) shown, the first vent 31 and the second vent 32 are respectively arranged on both sides of the airflow groove 10. Specifically, in a fuel cell stack containing multiple fuel cell electrode plates 100, when multiple fuel cell electrode plates 100 are stacked along a first direction (i.e., the thickness direction, Z direction), the first vents 31 of each fuel cell electrode plate 100 are sequentially aligned and connected in the stacking direction, together forming a first channel for hydrogen input; similarly, the second vents 32 of each fuel cell electrode plate 100 are also sequentially aligned and connected in the stacking direction, together forming a second channel for hydrogen output.

[0061] Therefore, during the operation of the fuel cell stack, hydrogen is distributed to each reaction zone through the first channel, and the residual gas or water vapor generated after participating in the electrochemical reaction is then discharged through the second channel.

[0062] See Figure 1 and Figure 2 As shown, in some embodiments of this application, the electrode body 1 is further provided with a weight-reducing structure 4. Specifically, the weight-reducing structure 4 can be a groove formed on the electrode body 1, which extends along a first direction (i.e., the electrode thickness direction, such as...). Figure 1 The groove is recessed in the Z-direction towards the inside of the electrode body 1, and the distribution position and size of the groove are set according to the overall structural strength and weight requirements of the electrode.

[0063] By incorporating a groove-shaped weight-reduction structure 4 into the electrode plate body 1, the material usage of the electrode plate body 1 can be effectively reduced without affecting the overall structural stability of the electrode plate and the function of the airflow channel 10, thereby reducing the overall weight of the fuel cell electrode plate 100. For example, when a fuel cell electromagnetic stack equipped with the fuel cell electrode plate 100 of this application is applied to an on-board fuel cell system, it helps to improve the system's power density and energy efficiency. At the same time, the arrangement of the weight-reduction grooves can be optimized according to the stress conditions and heat distribution characteristics of the electrode plate, avoiding structural strength reduction or uneven heat dissipation caused by local thinning, and ensuring that the fuel cell electrode plate 100 maintains reliable mechanical performance and thermal management effects during long-term operation.

[0064] In some embodiments of this application, the fuel cell stack is equipped with fuel cell electrode plates 100 according to some embodiments of this application. Specifically, the fuel cell stack includes a plurality of fuel cell electrode plates 100, which are arranged along a first direction (i.e., the thickness direction of the fuel cell electrode plate 100, such as...). Figure 1 (As shown in the Z-direction) The plates are stacked. A proton exchange membrane is sandwiched between two adjacent fuel cell plates 100 to form a complete electrochemical reaction unit.

[0065] When the fuel cell stack is in operation, air serves as both the reactant gas and the cooling medium, flowing along the second direction (i.e., the width direction of the fuel cell electrode 100, such as...). Figure 1 (As shown in the Y direction) The airflow flows sequentially through the airflow channels 10 of each fuel cell electrode 100. Inside the airflow channel 10 of each fuel cell electrode 100, the airflow follows a "splitting-converging-re-splitting" cycle: the airflow first enters the split channel 202 of the upstream turbulence component 2, where it is split into multiple branches and collides with the turbulence component 20; subsequently, the branches converge again in the downstream convergence channel 201; the converged airflow continues to flow forward and enters the split channel 202 of the next set of turbulence components 2, repeating the above process of dispersion and convergence.

[0066] By repeatedly implementing the above flow pattern among multiple sets of turbulence components 2, multiple collisions occur between the airflow and the turbulent fluid 20, causing the originally stable laminar flow state to transform into a highly turbulent state. This turbulence effect significantly prolongs the residence time of air in the electrode channel, making the gas distribution more uniform, thus providing more opportunities for gas participation in the electrochemical reaction on the proton exchange membrane surface. On the other hand, turbulence enhances the heat exchange efficiency between the airflow and the surface of the fuel cell electrode 100, enabling more effective removal of heat generated during the operation of the fuel cell stack, achieving synergistic optimization of reaction efficiency and heat dissipation performance.

[0067] Therefore, the fuel cell stack equipped with the fuel cell electrode plate 100 of this application achieves continuous turbulence enhancement of the reactant gas during the flow process through the unique turbulence component 2 layout inside the fuel cell electrode plate 100. This not only improves the uniformity of gas distribution and the utilization rate of reactant gas, but also improves the overall thermal management capability of the fuel cell stack, which helps to improve the performance and reliability of the fuel cell stack.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fuel cell electrode plate, characterized in that, include: An electrode body, wherein an airflow groove is provided on one side of the electrode body, the airflow groove is recessed toward the interior of the electrode body in a first direction, and the airflow groove extends through the electrode body in a second direction; At least two sets of flow-disrupting components are disposed within the airflow channel, with each set of components spaced apart along the second direction, such that adjacent sets of components form a converging flow channel; wherein... Each group of the turbulence components includes at least two turbulence elements, which protrude from the bottom surface of the airflow channel in the first direction and extend along the second direction. Adjacent turbulence elements are spaced apart along the third direction, so that the adjacent turbulence elements form a branch channel, which is connected to the adjacent converging channel. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The fuel cell electrode plate according to claim 1, characterized in that, The turbulent fluid forms a turbulent surface on at least one side of the surface in the third direction, wherein, The turbulence surface includes at least one first turbulence surface segment and at least one second turbulence surface segment, the first turbulence surface segment and the second turbulence surface segment are connected in sequence, the first turbulence surface segment is convex outward in the third direction, and the second turbulence surface segment is concave in the third direction.

3. The fuel cell electrode plate according to claim 2, characterized in that, Both sides of the turbulent fluid in the third direction are turbulent surfaces; In the turbulence assembly, the first turbulence surface segments of two adjacent turbulence fluids are arranged opposite each other in the third direction, and the second turbulence surface segments of two adjacent turbulence fluids are arranged opposite each other in the third direction.

4. The fuel cell electrode plate according to claim 1, characterized in that, The surface of the turbulent fluid facing the airflow in the second direction is the frontal surface, and the frontal surface is constructed as an arc-shaped surface.

5. The fuel cell electrode plate according to claim 1, characterized in that, In two adjacent sets of the turbulence components, the central axes of the two adjacent turbulence components are arranged to coincide.

6. The fuel cell electrode plate according to claim 1, characterized in that, In two adjacent sets of the turbulence components, the central axes of the two adjacent turbulence components are staggered.

7. The fuel cell electrode plate according to any one of claims 1 to 6, characterized in that, The electrode body and the turbulence component are integrally formed.

8. The fuel cell electrode plate according to any one of claims 1 to 6, characterized in that, The electrode plate body has a first vent and a second vent, and in the third direction, the first vent and the second vent are respectively located on both sides of the airflow groove.

9. The fuel cell electrode plate according to any one of claims 1 to 6, characterized in that, The electrode plate body is provided with a weight reduction structure.

10. A fuel cell stack, characterized in that, include: The fuel cell electrode plate according to any one of claims 1 to 9.

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