Polar plate and fuel cell

Abstract

The utility model discloses a polar plate and a fuel cell, the polar plate comprises: a polar plate main body, the polar plate main body is provided with a gas inlet zone, a reaction zone and an exhaust zone which are arranged in sequence along a first direction, the bottom surface of the reaction zone is provided with at least one row of a plurality of sawtooth structures which are arranged at intervals along the first direction and have transverse curvature and longitudinal curvature, in the direction from the exhaust area to the air inlet area, the sawtooth structure obliquely extends towards the bottom face away from the reaction area, the width of the sawtooth structure in the second direction is gradually reduced, and a liquid drainage flow channel is jointly defined between the sawtooth structure and the bottom face of the reaction area. According to the polar plate disclosed by the utility model, under the capillary action of the liquid discharge flow channels, water entering the liquid discharge flow channels can autonomously flow towards the direction close to the exhaust area along the liquid discharge flow channels and is discharged, so that the water can be prevented from blocking a gas flow channel in the reaction area, and the water flooding risk of the polar plate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole plate and a fuel cell. Background Art

[0002] With the global emphasis on clean energy and environmental protection, fuel cells, as a pollution-free and efficient energy conversion technology, are experiencing rapid growth in market demand. Fuel cells hold particularly promising applications in transportation, energy, and distributed power generation. Membrane electrode fuel cells, with their high conversion efficiency and zero emissions, have garnered widespread attention and initial application in the transportation sector. However, during fuel cell operation, water is produced during reactions. Water entering the anode or cathode gas channels can cause blockage and flooding. Therefore, ensuring the rapid drainage of water from the gas channels on the electrode plates has become a pressing issue in fuel cell development. Utility Model Content

[0003] In a first aspect, the present invention provides an electrode plate, which can realize autonomous discharge of water entering the reaction zone, thereby reducing the risk of flooding of the electrode plate.

[0004] According to the embodiment of the first aspect of the present invention, the electrode plate includes: a electrode plate body, having an air intake area, a reaction area and an exhaust area arranged in sequence along a first direction, and at least one row of multiple serrated structures arranged at intervals along the first direction and having a transverse curvature and a longitudinal curvature is provided on the bottom surface of the reaction area. In the direction from the exhaust area toward the air intake area, the serrated structure extends obliquely toward the bottom surface away from the reaction area and the width in the second direction gradually decreases, and the serrated structure and the bottom surface of the reaction area jointly define a drainage channel.

[0005] According to the electrode plate of the embodiment of the first aspect of the present invention, the multiple serrated structures arranged at intervals along the first direction can jointly define a plurality of drainage channels arranged along the first direction between the bottom surface of the reaction zone. Under the capillary action of the drainage channels, water entering the drainage channels can flow autonomously along the multiple drainage channels toward the direction close to the exhaust zone and be discharged from the electrode plate, thereby avoiding water blocking the gas flow channel in the reaction zone and reducing the risk of flooding of the electrode plate.

[0006] According to some embodiments of the present invention, the sawtooth structure is in the shape of a Araucaria leaf.

[0007] According to some embodiments of the present invention, the distance between the top surface of the free end of the sawtooth structure and the bottom surface of the reaction zone in the third direction is in the range of 0.6 to 1 mm, and the third direction is perpendicular to the first direction and the second direction; and / or, the angle between the line between the free end and the fixed end of the sawtooth structure and the first direction is in the range of 35 to 45°.

[0008] According to some embodiments of the present invention, in the first direction, the interval between any two adjacent sawtooth structures is the same; and / or, in the first direction, the interval between any two adjacent sawtooth structures is in the range of 0.6 to 1 mm.

[0009] According to some embodiments of the present invention, the curve where the lateral curvature is located is a first circular arc line, and the radius range of the first circular arc line is 0.6~0.8mm; and / or, the curve where the longitudinal curvature is located is a second circular arc line, and the radius range of the second circular arc line is 0.3~0.5mm.

[0010] According to some embodiments of the present invention, a side surface of the drainage channel facing away from the free end of the sawtooth structure is formed as a support platform, and the support platform is parallel to the first direction and the second direction.

[0011] According to some embodiments of the present invention, in the first direction, the ratio of the length of the support platform to the length of the sawtooth structure ranges from 1 / 5 to 1 / 2.

[0012] According to some embodiments of the present invention, a plurality of serrated structures arranged along the first direction constitute a serrated structure group, the serrated structure group is provided with a plurality of columns arranged at intervals along the second direction, the serrated structures in two adjacent columns are staggered along the first direction and define a reaction channel extending along the first direction, the reaction channel includes a plurality of reaction sub-channels connected in sequence along the first direction, and the width of the reaction sub-channel in the second direction is reduced in the direction from the air inlet area toward the exhaust area.

[0013] According to some embodiments of the present invention, the staggered distance in the first direction between the free ends of two adjacent sawtooth structures in the second direction ranges from 0.3 to 0.5 mm.

[0014] According to some embodiments of the present invention, in the second direction, the distance between the center lines of any two adjacent sawtooth structures is the same; and / or, in the second direction, the distance between the center lines of any two adjacent sawtooth structures ranges from 0.8 to 1.2 mm.

[0015] According to some embodiments of the present invention, the air intake area is provided with a plurality of first flow strips extending along the first direction and arranged at intervals along the second direction, and an air intake channel is defined between two adjacent first flow strips. The exhaust area is provided with a plurality of second flow strips extending along the first direction and arranged at intervals along the second direction, and an exhaust channel is defined between two adjacent second flow strips. The plurality of first flow strips, the plurality of columns of the serrated structure groups, and the plurality of second flow strips correspond one to one. In the second direction, the maximum widths of the first flow strips, the second flow strips, and the serrated structure are the same.

[0016] According to some embodiments of the present invention, in the direction from the exhaust area to the intake area, the side surface of the fixed end of the sawtooth structure in the second direction extends obliquely toward the drainage channel, and the angle between the side surface of the fixed end of the sawtooth structure in the second direction and the first direction is in the range of 10 to 20°.

[0017] According to some embodiments of the present invention, the thickness of the fixed end of the serrated structure in the first direction ranges from 0.1 to 0.3 mm.

[0018] According to some embodiments of the present invention, a drainage hole is formed at the connection position between the sawtooth structure and the bottom surface of the reaction zone.

[0019] According to some embodiments of the present invention, the drainage hole is semicircular, and the radius of the drainage hole ranges from 0.2 to 0.4 mm.

[0020] According to some embodiments of the present invention, the sawtooth structure is an axisymmetric structure, the axis of symmetry of the sawtooth structure is perpendicular to the second direction and passes through the center of the sawtooth structure in the second direction; and / or, the pole plate is an axisymmetric structure, the axis of symmetry of the pole plate is perpendicular to the second direction and passes through the center of the pole plate in the second direction.

[0021] A second aspect of the present invention provides a fuel cell.

[0022] A fuel cell according to an embodiment of the second aspect of the present invention includes: the above-mentioned electrode plate.

[0023] According to the fuel cell of the embodiment of the second aspect of the present invention, the multiple serrated structures arranged at intervals along the first direction can jointly define a plurality of drainage channels arranged along the first direction between the bottom surface of the reaction zone. Under the capillary action of the drainage channels, water entering the drainage channels can flow autonomously along the multiple drainage channels toward the direction close to the exhaust zone and be discharged from the electrode plates, thereby avoiding water blocking the gas flow channel in the reaction zone and reducing the risk of flooding of the electrode plates.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a plate according to an embodiment of the present utility model;

[0026] Figure 2 is a schematic diagram of two sawtooth structures arranged along a first direction of a plate according to an embodiment of the present utility model;

[0027] Figure 3 is a top view of multiple sawtooth structures of a plate according to an embodiment of the present utility model;

[0028] Figure 4 is a bottom view of the sawtooth structure of the electrode plate according to an embodiment of the present utility model;

[0029] Figure 5 It is a schematic diagram of the side of the electrode plate facing the exhaust area according to an embodiment of the present utility model.

[0030] Reference numerals:

[0031] 100, plate;

[0032] 1. Plate body; 11. Air intake area; 12. Reaction area; 13. Exhaust area;

[0033] Sawtooth structure group; 2. Sawtooth structure; 21. First arc line; 22. Second arc line; 23. Support platform; 24. Drain hole;

[0034] 3. Discharge channel; 4. Reaction channel; 41. Reaction sub-channel;

[0035] 5. First flow channel; 6. Intake flow channel; 7. Second flow channel; 8. Exhaust flow channel;

[0036] e1, first direction; e2, second direction; e3, third direction. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will appreciate the applicability of other processes and / or the use of other materials.

[0039] The electrode plate 100 according to an embodiment of the first aspect of the present invention will be described below with reference to the accompanying drawings.

[0040] like Figures 1 to 5 As shown, the electrode plate 100 according to the embodiment of the first aspect of the present invention includes: a electrode plate body 1 and a serrated structure 2, the electrode plate body 1 has an air inlet area 11, a reaction area 12 and an exhaust area 13 arranged in sequence along the first direction e1, that is, the gas participating in the reaction enters the reaction area 12 through the air inlet area 11, and the remaining gas after the reaction is discharged through the exhaust area 13, and at least one row of multiple serrated structures 2 arranged at intervals along the first direction e1 and having a transverse curvature and a longitudinal curvature is provided on the bottom surface of the reaction area 12. In the direction from the exhaust area 13 toward the air inlet area 11, the serrated structure 2 extends obliquely toward the bottom surface away from the reaction area 12 and the width in the second direction e2 gradually decreases, and a drainage channel 3 is jointly defined between the serrated structure 2 and the bottom surface of the reaction area 12.

[0041] It should be noted that the bottom surface of the reaction zone 12 refers to the side surface of the reaction zone 12 in the thickness direction of the electrode plate 100, the transverse curvature refers to the curvature change of the serrated structure 2 in the extension direction of the plane parallel to the first direction e1 and the second direction e2, and the longitudinal curvature refers to the curvature change of the serrated structure 2 in the extension direction of the plane perpendicular to the second direction e2. Among them, the drainage channel 3 is open in the direction close to the air inlet area 11, and the multiple serrated structures 2 arranged at intervals along the first direction e1 can jointly define a plurality of drainage channels 3 arranged along the first direction e1 with the bottom surface of the reaction zone 12. Since the serrated structure 2 has a transverse curvature and a longitudinal curvature, and at the same time, the serrated structure 2 extends obliquely toward the bottom surface away from the reaction zone 12 and the width in the second direction e2 gradually decreases, a capillary phenomenon occurs in the drainage channel 3. The liquid in the drainage channel 3 can flow toward the drainage channel 3 located on the downstream side under the capillary action. Therefore, when water enters the reaction zone 12, it can flow to the back side of the serrated structure 2 after entering the drainage channel 3 under the capillary action, and flow along the back side of the serrated structure 2 to another adjacent drainage channel 3 located on the downstream side. That is to say, under the capillary action of the drainage channel 3, the water entering the drainage channel 3 can flow autonomously along the multiple drainage channels 3 toward the direction close to the exhaust area 13 and be discharged from the electrode plate 100, thereby avoiding water blocking the gas flow channel in the reaction area 12 and reducing the risk of flooding of the electrode plate 100.

[0042] According to the electrode plate 100 of the embodiment of the first aspect of the present invention, the multiple serrated structures 2 arranged at intervals along the first direction e1 can jointly define a plurality of drainage channels 3 arranged along the first direction e1 with the bottom surface of the reaction zone 12. Under the capillary action of the drainage channels 3, water entering the drainage channels 3 can flow autonomously along the multiple drainage channels 3 toward the direction close to the exhaust zone 13 and be discharged from the electrode plate 100, thereby avoiding water blocking the gas flow channel in the reaction zone 12 and reducing the risk of flooding of the electrode plate 100.

[0043] According to some embodiments of the present invention, the sawtooth structure 2 is shaped like an Araucaria leaf. Specifically, the sawtooth structure 2 in the present application is a biomimetic structure. By imitating the structure of an Araucaria leaf, the characteristics of the Araucaria leaf can be effectively utilized to enable a high-surface-energy fluid, such as water, to overcome gravity and autonomously move in a direction opposite to the inclination of the Araucaria leaf structure, i.e., toward the exhaust region 13. In other words, the structural characteristics enable autonomous water transport without the need for external forces, thereby preventing water from clogging the reaction channel 4 within the reaction region 12 and causing flooding.

[0044] In one specific example, the projection of the sawtooth structure 2 on a reference plane parallel to the first direction e1 and the second direction e2 is fan-shaped, with the tip of the fan proximate to the air inlet region 11 and the curved side of the fan proximate to the air outlet region 13. The projection of the sawtooth structure 2 on a reference plane perpendicular to the second direction e2 is crescent-shaped. That is, in both the extension direction of the reference plane parallel to the first direction e1 and the second direction e2 and the extension direction of the reference plane perpendicular to the second direction e2, the sawtooth structure 2 is an arc-shaped arc that is concave away from the drainage channel 3.

[0045] In some embodiments, the sawtooth structure 2 is a sub-millimeter structure, that is, the dimensions of the sawtooth structure 2 in multiple directions do not exceed 1 mm, so as to ensure the stable occurrence of the capillary phenomenon at the sawtooth structure 2 .

[0046] According to some embodiments of the present invention, the distance between the top surface of the free end of the sawtooth structure 2 and the bottom surface of the reaction zone 12 in the third direction e3 is in the range of 0.6 to 1 mm, and the third direction e3 is perpendicular to the first direction e1 and the second direction e2. That is, the height of the sawtooth structure 2 protruding from the bottom surface of the reaction zone 12 (e.g. Figure 2 The height h) shown in FIG is controlled within the range of 0.6 mm to 1 mm. Thus, it is possible to avoid the sawtooth structure 2 being too low in height, which affects the supporting effect of the sawtooth structure 2 on the membrane electrode. At the same time, it is possible to avoid the sawtooth structure 2 being too high in height and the height of the drainage channel 3 being too large, which affects the capillary effect. That is, the sawtooth structure 2 is controlled to the submillimeter level to ensure that the capillary phenomenon can be stably generated at the drainage channel 3. Among them, the height of the sawtooth structure 2 protruding from the bottom surface of the reaction zone 12 can be 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, etc., and no specific restrictions are made here.

[0047] According to some embodiments of the present invention, the angle ( Figure 2 The range of α) shown in is 35 to 45°. That is, the inclination angle of the serrated structure 2 as a whole relative to the first direction e1 is controlled within the range of 35° to 45°. Among them, if the inclination angle of the serrated structure 2 as a whole relative to the first direction e1 is too high or too low, it will affect the capillary phenomenon at the drainage channel 3. As a result, the inclination angle of the serrated structure 2 as a whole relative to the first direction e1 can better meet the requirement of autonomous flow of water under the capillary action of the drainage channel 3. Among them, the inclination angle of the serrated structure 2 as a whole relative to the first direction e1 can be 35°, 37°, 39°, 40°, 42°, 43°, 45°, etc., and no specific limitation is made here.

[0048] According to some embodiments of the present invention, the spacing between any two adjacent sawtooth structures 2 in the first direction e1 is uniform. That is, the multiple sawtooth structures 2 arranged along the first direction e1 are evenly spaced, thereby forming multiple drainage channels 3 evenly arranged along the first direction e1. This ensures that water flows continuously and autonomously through the multiple drainage channels 3 toward the exhaust area 13, thereby preventing water from clogging the reaction channels 4 in the reaction area 12 and causing flooding.

[0049] According to some embodiments of the present invention, in the first direction e1, the interval between two adjacent sawtooth structures 2 (eg Figure 3 The p) shown in FIG is in the range of 0.6 to 1 mm. This prevents the spacing between two adjacent sawtooth structures 2 in the first direction e1 from being too small, or the sawtooth structures 2 from being too dense, which increases the difficulty in production. It also prevents the spacing between two adjacent sawtooth structures 2 in the first direction e1 from exceeding the submillimeter level, which would affect capillary phenomena. This reduces the difficulty in producing the electrode plate 100 while ensuring that water automatically flows toward the exhaust region 13 under the action of the drainage channel 3. The spacing between two adjacent sawtooth structures 2 in the first direction e1 can be 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, etc., without specific limitation.

[0050] According to some embodiments of the present invention, the curve where the transverse curvature is located is the first arc line 21, and the radius of the first arc line 21 (such as Figure 4 The R1) shown in the figure is in the range of 0.6 to 0.8 mm. It can be understood that, based on the fixed size of the sawtooth structure 2 in the second direction e2, the larger the radius of the first arc line 21, the smaller the curvature of the sawtooth structure 2 in the second direction e2, and the closer the sawtooth structure 2 is to a plane perpendicular to the first direction e1. Conversely, the smaller the radius of the first arc line 21, the greater the curvature of the sawtooth structure 2 in the second direction e2. If the curvature of the sawtooth structure 2 in the second direction e2 is too large or too small, it will affect the capillary phenomenon in the drainage channel 3. Therefore, by controlling the radius of the first arc line 21 within the range of 0.6 mm to 0.8 mm, it is possible to avoid the curvature of the sawtooth structure 2 in the second direction e2 being too large or too small to affect the capillary phenomenon in the drainage channel 3, thereby ensuring that the capillary phenomenon can be stably generated in the drainage channel 3 and that the water in the drainage channel 3 is transported to the back side of the sawtooth structure 2. Among them, the radius of the first arc line 21 can be 0.6mm, 0.62mm, 0.65mm, 0.68mm, 0.7mm, 0.73mm, 0.75mm, 0.77mm, 0.8mm, etc., and there is no specific limitation here.

[0051] According to some embodiments of the present invention, the curve where the longitudinal curvature is located is the second arc line 22, and the radius of the second arc line 22 (such as Figure 2 The R2) shown in the figure is in the range of 0.3 to 0.5 mm. It can be understood that, based on the fixed size of the sawtooth structure 2 in the third direction e3, the larger the radius of the second arc line 22, the smaller the curvature of the sawtooth structure 2 in the third direction e3, and the closer the sawtooth structure 2 is to the plane perpendicular to the first direction e1. Conversely, the smaller the radius of the second arc line 22, the greater the curvature of the sawtooth structure 2 in the third direction e3. If the curvature of the sawtooth structure 2 in the third direction e3 is too large or too small, it will affect the capillary phenomenon in the drainage channel 3. Therefore, by controlling the radius of the second arc line 22 within the range of 0.3 mm to 0.5 mm, it is possible to avoid the curvature of the sawtooth structure 2 in the third direction e3 being too large or too small to affect the capillary phenomenon in the drainage channel 3, so as to ensure that the capillary phenomenon can be stably generated in the drainage channel 3 and that the water in the drainage channel 3 is transported to the back side of the sawtooth structure 2. The radius of the second arc line 22 can be 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, 0.43mm, 0.45mm, 0.47mm, 0.5mm, etc., and there is no specific limitation here.

[0052] According to some embodiments of the present invention, the side of the drainage channel 3, which faces away from the free end of the sawtooth structure 2, is formed as a support platform 23. The support platform 23 is parallel to the first direction e1 and the second direction e2. Since the membrane electrode is disposed on the side of the sawtooth structure 2 facing away from the bottom surface of the reaction zone 12 in the third direction e3, the provision of the support platform 23 can effectively increase the contact area between the sawtooth structure 2 and the membrane electrode, thereby improving the stability of the electrode plate 100 supporting the membrane electrode. It can also prevent the sawtooth structure 2 from puncturing the membrane electrode, thereby improving the stability of the fuel cell.

[0053] According to some embodiments of the present invention, in the first direction e1, the ratio of the length of the support platform 23 to the length of the sawtooth structure 2 (ie Figure 2The ratio of b to R2 shown in FIG is in the range of 1 / 5 to 1 / 2. Among them, based on the fixed length of the sawtooth structure 2 in the first direction e1, the smaller the ratio of the length of the support platform 23 to the length of the sawtooth structure 2, the smaller the length of the support platform 23, and the smaller the contact area between the support platform 23 and the membrane electrode. The larger the ratio of the length of the support platform 23 to the length of the sawtooth structure 2, the longer the length of the support platform 23, but at the same time, the curvature of the back side of the sawtooth structure 2 will be reduced. Therefore, by controlling the ratio of the length of the support platform 23 to the length of the sawtooth structure 2 within the range of 1 / 5 to 1 / 2, it is possible to avoid the length of the support platform 23 being too short to affect the support effect on the membrane electrode, and at the same time, it is possible to avoid the length of the support platform 23 being too large and the curvature of the back side of the sawtooth structure 2 being too small to affect the capillary effect, thereby ensuring that the capillary phenomenon can be normally generated at the sawtooth structure 2 on the basis of ensuring the support effect of the support platform 23 on the membrane electrode.

[0054] According to some embodiments of the present invention, a plurality of sawtooth structures 2 arranged along a first direction e1 constitute a sawtooth structure group, the sawtooth structure group is provided with a plurality of columns arranged at intervals along a second direction e2, two adjacent columns of sawtooth structures 2 are staggered along the first direction e1 and define a reaction channel 4 extending along the first direction e1, the reaction channel 4 includes a plurality of reaction sub-channels 41 connected in sequence along the first direction e1, and in the direction from the air inlet area 11 toward the exhaust area 13, the width of the reaction sub-channel 41 in the second direction e2 is reduced.

[0055] That is to say, in the direction from the air inlet area 11 toward the exhaust area 13, the reaction channel 4 is composed of a plurality of reaction sub-channels 41 that are connected in sequence and gradually shrink. When the gas from the air inlet area 11 enters the reaction channel 4 this year, it will flow into the exhaust area 13 along the plurality of reaction sub-channels 41 that are connected in sequence and gradually shrink. Among them, since the reaction sub-channels 41 are in a gradually shrinking structure, the speed of the airflow toward the exhaust area 13 can be better accelerated. Therefore, the liquid entering the reaction channel 4 can be accelerated to flow along the reaction channel 4 to the exhaust area 13 and discharged under the action of the airflow. That is, the liquid discharge efficiency in the reaction zone 12 can be accelerated through the reaction sub-channel 41 to further avoid the flooding problem caused by water blocking the reaction channel 4.

[0056] In addition, due to the shape characteristics of the sawtooth structure 2, the cross-section of the flow channel formed by the front and rear adjacent sawtooth structures 2 gradually decreases from top to bottom. The gas flows downward along the sawtooth structure 2 at an accelerated rate, which can enhance the mixing of the gas in the reaction channel 4, improve the uniformity of the gas in the reaction zone 12, and further accelerate the discharge of liquid water. In addition, due to the shape characteristics of the sawtooth structure 2, the projected area of ​​the sawtooth structure 2 on the reference plane parallel to the first direction e1 and the second direction e2 is smaller, thereby increasing the active area of ​​contact between the gas and the membrane electrode in the reaction zone 12, thereby improving the output performance of the battery. Compared with the strip-shaped flow channel ribs in the conventional straight strip reaction flow field, the sawtooth structure 2 releases the active area located on the opposite sides of the tip in the second direction e2.

[0057] Among them, one of the two adjacent columns of sawtooth structure groups can be staggered with the other column of sawtooth structure groups by translating a certain distance along the first direction e1. For example, the sawtooth structure groups in the even columns are translated a certain distance as a whole relative to the sawtooth structure groups in the odd columns along the first direction e1, that is, the gas direction.

[0058] According to some embodiments of the present invention, the distance between the free ends of two adjacent sawtooth structures 2 in the second direction e2 and the offset distance in the first direction e1 (eg Figure 3 The range of d) shown in the figure is 0.3 to 0.5 mm. Among them, if the distance between the free ends of two adjacent sawtooth structures 2 in the second direction e2 is too long or too short in the first direction e1, it will cause the length difference between the two adjacent reaction sub-channels 41 in the first direction e1 to be too large. Therefore, by controlling the distance between the free ends of two adjacent sawtooth structures 2 in the second direction e2 in the first direction e1 to be within the range of 0.3 mm to 0.5 mm, it is possible to avoid the staggered distance being too large or too small, and the length difference between the two adjacent reaction sub-channels 41 in the first direction e1 being too large, thereby affecting the acceleration effect of the gas in the reaction channel 4, thereby ensuring that each reaction sub-channel 41 can efficiently increase the velocity of the gas flowing through it to improve the discharge efficiency of the liquid water. Among them, the staggered distance between the free ends of two adjacent serrated structures 2 in the second direction e2 in the first direction e1 can be 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, 043mm, 0.45mm, 0.47mm, 0.5mm, etc., and there is no specific limitation here.

[0059] According to some embodiments of the present invention, the distance between the centerlines of any two adjacent sawtooth structures 2 in the second direction e2 is the same. The centerlines of the sawtooth structures 2 are perpendicular to the second direction e2 and pass through the center of the sawtooth structures 2 in the second direction e2. In other words, multiple groups of sawtooth structures are evenly spaced along the second direction e2, thereby forming reaction channels 4 of uniform specifications and ensuring uniform gas distribution within the multiple reaction channels 4.

[0060] According to some embodiments of the present invention, in the second direction e2, the distance between the center lines of any two adjacent sawtooth structures 2 (e.g. Figure 3 The w) range shown in is 0.8 to 1.2 mm. The center line of the zigzag structure 2 is perpendicular to the second direction e2 and passes through the center of the zigzag structure 2 in the second direction e2. It can be understood that the closer the distance between the center lines of two adjacent zigzag structures 2, the smaller the width dimension of the reaction channel 4 in the second direction e2, the more columns of zigzag structure groups that can be set, and more reaction channels 4 arranged along the second direction e2 can be formed; conversely, the farther the distance between the center lines of two adjacent zigzag structures 2, the larger the width dimension of the reaction channel 4 in the second direction e2, the fewer columns of zigzag structure groups that can be set, and the fewer reaction channels 4 that can be formed. Therefore, by controlling the distance between the center lines of any two adjacent zigzag structures 2 within the range of 0.8 mm to 1.2 mm, it is possible to avoid the width dimension of the reaction channel 4 being too small to increase the flow resistance, and at the same time, it is possible to avoid the width of the reaction channel 4 being too large or the number being too small to affect the working efficiency of the fuel cell. The distance between the center lines of any two adjacent sawtooth structures 2 may be 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, 1.05 mm, 1.2 mm, etc., and is not specifically limited here.

[0061] According to some embodiments of the present invention, the air intake area 11 is provided with a plurality of first flow strips 5 extending along the first direction e1 and arranged at intervals along the second direction e2, and an air intake channel 6 is defined between two adjacent first flow strips 5. The exhaust area 13 is provided with a plurality of second flow strips 7 extending along the first direction e1 and arranged at intervals along the second direction e2, and an exhaust channel 8 is defined between two adjacent second flow strips 7. The plurality of first flow strips 5, the plurality of columns of serrated structure groups, and the plurality of second flow strips 7 correspond one to one. In the second direction e2, the maximum widths of the first flow strips 5, the second flow strips 7, and the serrated structure 2 are the same.

[0062] That is, the multiple first flow channel strips 5 collectively define multiple inlet flow channels 6 arranged along the second direction e2, and the multiple second flow channel strips 7 collectively define multiple exhaust channels arranged along the second direction e2. The multiple inlet flow channels 6, the multiple reaction flow channels 4, and the multiple exhaust channels correspond one-to-one, and the inlet flow channels 6 are opposite and connected to the corresponding reaction flow channels 4 and exhaust flow channels 8 along the first direction e1. This reduces the pressure loss of the airflow from the inlet flow channels 6 into the reaction flow channels 4 and from the reaction flow channels 4 into the exhaust flow channels 8. Furthermore, the maximum width of the zigzag structure 2 is the same as the width of the first flow channel strips 5 and the second flow channel strips 7. Compared to the ribs of the reaction flow field with a constant width, the left and right sides of the zigzag structure 2 provide more space for the diversion channels, thereby increasing the active area of ​​the reaction zone 12 and improving battery performance.

[0063] In a specific example, the spacing between multiple first flow strips 5 and the corresponding serrated structure groups in the first direction e1 is the same, and the spacing between multiple second flow strips 7 and the corresponding serrated structures 2 in the first direction e1 is the same, so as to ensure the uniformity of the flow field distribution in the reaction area 12.

[0064] According to some embodiments of the present invention, in the direction from the exhaust area 13 to the intake area 11, the side surface of the fixed end of the sawtooth structure 2 in the second direction e2 extends obliquely toward the drainage channel 3, and the angle between the side surface of the fixed end of the sawtooth structure 2 in the second direction e2 and the first direction e1 (such as Figure 4 The β) shown in the figure is in the range of 10 to 20°. The greater the angle between the side surface of the sawtooth structure 2 fixed on the second side and the first direction e1, the greater the angle of the tip of the sawtooth structure 2 in the second direction e2. Conversely, the smaller the angle of the tip of the sawtooth structure 2 in the second direction e2. It can be understood that, based on the fixed size of the sawtooth structure 2 in the second direction e2, the greater the angle of the tip of the sawtooth structure 2 in the second direction e2, the smaller the size of the sawtooth structure 2 in the first direction e1, and the closer the sawtooth structure 2 is to being perpendicular to the first direction e1, which is not conducive to the generation of capillary phenomenon. On the other hand, the smaller the angle of the tip of the sawtooth structure 2 in the second direction e2, the larger the size of the sawtooth structure 2 in the first direction e1, the longer the distance the liquid flows in the single drainage channel 3, and the higher the requirements for the generation of capillary phenomenon.

[0065] Therefore, by controlling the angle between the side surface of the fixed end of the sawtooth structure 2 in the second direction e2 and the first direction e1 within a range of 10° to 20°, it is possible to prevent the angle of the tip of the sawtooth structure 2 in the second direction e2 from being too large or too small, thereby affecting the capillary phenomenon in the drainage channel 3. The angle between the side surface of the fixed end of the sawtooth structure 2 in the second direction e2 and the first direction e1 can be 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, etc., without specific limitation.

[0066] According to some embodiments of the present invention, the thickness of the fixed end of the sawtooth structure 2 in the first direction e1 (eg Figure 4 The range of t) shown in the figure is 0.1 to 0.3 mm. Among them, the greater the thickness of the fixed end of the sawtooth structure 2 in the first direction e1, the larger the connection area between the sawtooth structure 2 and the bottom surface of the reaction zone 12, but the larger the area of ​​the reaction zone 12 occupied by the sawtooth structure 2; conversely, the smaller the thickness of the fixed end of the sawtooth structure 2 in the first direction e1, the smaller the connection area between the sawtooth structure 2 and the bottom surface of the reaction zone 12, but the smaller the area of ​​the reaction zone 12 occupied by the sawtooth structure 2. Therefore, by controlling the thickness of the fixed end of the sawtooth structure 2 in the first direction e1 within the range of 0.1 mm to 0.3 mm, the area of ​​the reaction zone 12 occupied by the sawtooth structure 2 can be reduced while ensuring the connection area between the sawtooth structure 2 and the bottom surface of the reaction zone 12, thereby increasing the active area of ​​the reaction zone 12 while improving the strength of the sawtooth structure 2.

[0067] According to some embodiments of the present invention, a drainage hole 24 is formed at the connection position between the sawtooth structure 2 and the bottom surface of the reaction area 12. In other words, the drainage channel 3 can be connected to the drainage channel 3 on the downstream side through the drainage hole 24, so that liquid water entering the drainage channel 3 can enter the drainage channel 3 on the downstream side through the drainage hole 24 and then be discharged from the electrode plate 100, thereby preventing liquid water from remaining in the drainage channel 3.

[0068] According to some embodiments of the present invention, the drain hole 24 is semicircular, and the diameter of the drain hole 24 (e.g. Figure 5The R3) range shown in the figure is 0.2 to 0.4 mm. Among them, the larger the inner diameter of the drainage hole 24, the higher the drainage efficiency of the drainage hole 24, but the area of ​​the hollow area on the sawtooth structure 2 is larger; conversely, the smaller the inner diameter of the drainage hole 24, the lower the drainage efficiency of the drainage hole 24, but the area of ​​the hollow area on the sawtooth structure 2 is smaller. Therefore, by controlling the diameter of the drainage hole 24 within the range of 0.2 mm to 0.4 mm, the drainage efficiency of the drainage hole 24 can be ensured while reducing the influence of the opening area of ​​the drainage hole 24 on the overall strength of the sawtooth structure 2. In addition, the semicircular drainage hole 24 can better meet the characteristics of the sawtooth structure 2 and has a reasonable structure.

[0069] According to some embodiments of the present invention, the sawtooth structure 2 is an axisymmetric structure, with the axis of symmetry of the sawtooth structure 2 being perpendicular to the second direction e2 and passing through the center of the sawtooth structure 2 in the second direction e2. This can significantly reduce the difficulty of machining and forming the sawtooth structure 2, while ensuring that the splitter flow channel can be formed into a symmetrical structure along the second direction e2, thereby ensuring the stability of the gas flow direction.

[0070] According to some embodiments of the present invention, the electrode plate 100 has an axisymmetric structure, where the axis of symmetry of the electrode plate 100 is perpendicular to the second direction e2 and passes through the center of the electrode plate 100 in the second direction e2. This ensures uniformity of the flow in the intake zone 11, reaction zone 12, and exhaust zone 13, thereby improving battery performance.

[0071] A fuel cell according to an embodiment of the second aspect of the present invention will be described below with reference to the accompanying drawings.

[0072] The fuel cell according to the second embodiment of the present invention includes: an electrode plate 100 .

[0073] In the fuel cell of the embodiment of the second aspect of the present invention, the multiple serrated structures 2 arranged at intervals along the first direction e1 can jointly define a plurality of drainage channels 3 arranged along the first direction e1 between the bottom surface of the reaction area 12. Under the capillary action of the drainage channels 3, water entering the drainage channels 3 can flow autonomously along the multiple drainage channels 3 toward the direction close to the exhaust area 13 and be discharged from the electrode plate 100, thereby avoiding water blocking the gas flow channel in the reaction area 12 and reducing the risk of flooding of the electrode plate 100.

[0074] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0076] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A plate, characterized in that: include: The electrode plate body has an air intake area, a reaction area and an exhaust area arranged in sequence along a first direction. The bottom surface of the reaction area is provided with at least one row of multiple serrated structures arranged at intervals along the first direction and having a transverse curvature and a longitudinal curvature. In the direction from the exhaust area toward the air intake area, the serrated structure extends obliquely toward the bottom surface away from the reaction area and the width in the second direction gradually decreases. The serrated structure and the bottom surface of the reaction area jointly define a drainage channel.

2. The electrode plate according to claim 1, characterized in that The sawtooth structure is in the shape of a Araucaria leaf.

3. The electrode plate according to claim 1, characterized in that The distance between the top surface of the free end of the serrated structure and the bottom surface of the reaction zone in the third direction is in the range of 0.6 to 1 mm, and the third direction is perpendicular to the first direction and the second direction; and / or, the angle between the line between the free end and the fixed end of the serrated structure and the first direction is in the range of 35 to 45°.

4. The electrode plate according to claim 1, characterized in that In the first direction, the interval between any two adjacent sawtooth structures is the same; and / or, in the first direction, the interval between any two adjacent sawtooth structures is in the range of 0.6 to 1 mm.

5. The electrode plate according to claim 1, characterized in that: The curve where the transverse curvature lies is a first arc line, and the radius of the first arc line ranges from 0.6 to 0.8 mm; and / or the curve where the longitudinal curvature lies is a second arc line, and the radius of the second arc line ranges from 0.3 to 0.5 mm.

6. The electrode plate according to claim 1, characterized in that: A side surface of the drainage channel at a free end of the sawtooth structure is formed as a support platform, and the support platform is parallel to the first direction and the second direction.

7. The electrode plate according to claim 6, characterized in that: In the first direction, the ratio of the length of the support platform to the length of the sawtooth structure is in a range of 1 / 5 to 1 / 2.

8. The electrode plate according to claim 1, characterized in that: A plurality of serrated structures arranged along the first direction constitute a serrated structure group, and the serrated structure group is provided with a plurality of columns arranged at intervals along the second direction. The serrated structures in two adjacent columns are staggered along the first direction and define a reaction channel extending along the first direction. The reaction channel includes a plurality of reaction sub-channels connected in sequence along the first direction. In the direction from the air inlet area toward the exhaust area, the width of the reaction sub-channel in the second direction is reduced.

9. The electrode plate according to claim 8, characterized in that: The staggered distance between the free ends of two adjacent sawtooth structures in the second direction in the first direction ranges from 0.3 to 0.5 mm.

10. The electrode plate according to claim 8, characterized in that: In the second direction, the distance between the center lines of any two adjacent sawtooth structures is the same; and / or, in the second direction, the distance between the center lines of any two adjacent sawtooth structures is in the range of 0.8 to 1.2 mm.

11. The electrode plate according to claim 8, characterized in that: The air intake area is provided with a plurality of first flow strips extending along the first direction and arranged at intervals along the second direction, and an air intake flow channel is defined between two adjacent first flow strips. The exhaust area is provided with a plurality of second flow strips extending along the first direction and arranged at intervals along the second direction, and an exhaust flow channel is defined between two adjacent second flow strips. The plurality of first flow strips, the plurality of columns of the serrated structure groups, and the plurality of second flow strips correspond one to one. In the second direction, the maximum widths of the first flow strips, the second flow strips, and the serrated structure are the same.

12. The electrode plate according to claim 1, characterized in that: In the direction from the exhaust area to the intake area, the side surface of the fixed end of the sawtooth structure in the second direction extends obliquely toward the drainage channel, and the angle between the side surface of the fixed end of the sawtooth structure in the second direction and the first direction is in the range of 10 to 20 degrees.

13. The electrode plate according to claim 1, characterized in that: The thickness of the fixed end of the sawtooth structure in the first direction ranges from 0.1 to 0.3 mm.

14. The electrode plate according to claim 1, characterized in that A drainage hole is formed at a connection position between the sawtooth structure and the bottom surface of the reaction zone.

15. The electrode plate according to claim 14, characterized in that: The drainage hole is semicircular, and the radius of the drainage hole ranges from 0.2 to 0.4 mm.

16. The electrode plate according to claim 1, characterized in that The sawtooth structure is an axisymmetric structure, the axis of symmetry of the sawtooth structure is perpendicular to the second direction and passes through the center of the sawtooth structure in the second direction; and / or, the pole plate is an axisymmetric structure, the axis of symmetry of the pole plate is perpendicular to the second direction and passes through the center of the pole plate in the second direction.

17. A fuel cell, characterized in that: include: The electrode plate according to any one of claims 1 to 16.

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