CN219419097U - Fuel cell cathode flow field plate structure - Google Patents
Fuel cell cathode flow field plate structure Download PDFInfo
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- CN219419097U CN219419097U CN202320081572.1U CN202320081572U CN219419097U CN 219419097 U CN219419097 U CN 219419097U CN 202320081572 U CN202320081572 U CN 202320081572U CN 219419097 U CN219419097 U CN 219419097U
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- cathode
- flow field
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- fuel cell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The utility model relates to a fuel cell cathode flow field plate structure, which belongs to the technical field of fuel cells and comprises a cathode plate, wherein an air inlet and an air outlet are respectively arranged on two sides of the cathode plate along the width direction of the cathode plate, and a through cathode flow field connected with the air inlet and the air outlet is arranged on one side of the cathode plate.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to a structure of a cathode flow field plate of a fuel cell.
Background
Proton exchange membrane fuel cells are currently receiving more and more attention at home and abroad as an energy conversion device with environmental protection and high operation efficiency. As one of the fuel cell application scenarios, the automotive field puts forward a higher vehicle-standard-level requirement for automotive fuel cells. The electric pile is used as a core part of the fuel cell, is a place where electrochemical reaction occurs, and the fuel gas hydrogen reacts with air to convert chemical energy reaction into electric energy. In the galvanic pile, the cathode flow channels can uniformly distribute air to the reaction layers of the electrodes to perform electrode reaction, and water generated by the reaction is discharged.
At present, air in a galvanic pile is supplied by pumping compressed air into a galvanic pile flow field through an air compressor, and parasitic loss generated by the operation of the air compressor is closely related to the flow resistance of a flow channel of a bipolar plate. The bipolar plate cathode in the prior art generally distributes gas to a reaction effective area through a gas distribution area flow channel, and the rotationally symmetrical gas distribution area collects and eliminates the air with the over-metering ratio and the water generated by the reaction; or the serpentine flow passage is adopted to bend the flow passage and communicate the flow passage with the inlet and outlet manifold for carrying out air and generated water transmission, and the two common modes can lead to the increase of flow resistance, so that the operation load of the air compressor is improved, and the net output power of the system is reduced. In addition, the flow channels of the cathode flow field in the prior art are generally in a horizontal direction, which leads to easy flooding of the electric pile during high-power operation and accordingly leads to power reduction of the electric pile. If the water in the flow channel is not completely discharged during shutdown of the electric pile, expansion stress can be generated when the temperature of the environment is low, so that structural damage is caused to parts such as a bipolar plate and a membrane electrode of the electric pile, and irreversible influence is caused.
For example, the patent with publication number CN110828844a discloses a cathode-anode flow field of a high-performance proton exchange membrane fuel cell and a bipolar plate thereof, wherein a folded straight cathode flow field structure is punched on the cathode plate, and the cathode flow field is a folded flow field, and the flow channel is in a horizontal direction, so that the problems of large field flow resistance, reduced net output power of the system, easy flooding of a galvanic pile, easy residual of water after purging and the like still exist.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a fuel cell cathode flow field plate structure which can reduce air resistance of air in a flow channel, improve output power of a system, and can easily drain water in a galvanic pile by utilizing gravity, so that the problem of flooding of the galvanic pile during operation is avoided.
In order to achieve the above purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows: the fuel cell cathode flow field plate structure comprises a cathode plate, wherein an air inlet and an air outlet are respectively arranged on two sides of the cathode plate along the width direction of the cathode plate, and a straight-through cathode flow field connected with the air inlet and the air outlet is arranged on one side of the cathode plate.
Two sides of the cathode plate are respectively provided with a plurality of air inlets and a plurality of air outlets along the length direction of the cathode plate, and two adjacent air inlets are communicated with two adjacent air outlets through guide grooves.
And a plurality of through holes are respectively arranged on the cathode plate at intervals along the two sides of the width direction of the cathode plate, two opposite through holes are communicated with corresponding flow passages in the cathode flow field, and the two opposite through holes are respectively arranged at two ends of the corresponding flow passages.
The cathode plate is provided with a flow guide section near the inner edges of the air inlet and the air outlet respectively, one end of the flow guide section extends to the edges of the air inlet and the air outlet and is communicated with the flow guide groove, and the other end of the flow guide section is connected with the cathode flow field through a via hole.
The flow guiding section comprises a plurality of straight flow channels at intervals, and the width of each straight flow channel is equal to that of the flow channel in the cathode flow field.
The cathode flow field comprises a plurality of through flow channels which are spaced, wherein the width of each through flow channel is 0.6-1 mm, and the depth of each through flow channel is 0.35-0.55 mm.
The periphery of the air inlet and the air outlet is provided with annular reinforcing bosses.
The air inlet and the air outlet are respectively provided with a strip-shaped hole, the corners at the two ends of the air inlet and the air outlet are respectively provided with a transition fillet, and the cross sections of the air inlet and the air outlet are respectively 2500-2800 mm 2 。
The periphery of the cathode plate and the periphery of the cathode flow field are both provided with annular sealing grooves, the width of each annular sealing groove is set to be 2-3 mm, the depth is 0.35-0.5 mm, and sealing strips are arranged in the annular sealing grooves.
The negative plate is set to the rectangular plate, the four corners position department of negative plate all is provided with the installation breach.
The beneficial effects of the utility model are as follows:
1. according to the utility model, the air inlet and the air outlet are respectively arranged on the two sides of the cathode plate along the width direction, and the cathode flow field connected with the air inlet and the air outlet is arranged on one side of the cathode plate, and the flow channel in the cathode flow field is a vertical through flow channel, so that the air resistance of air in the flow channel can be reduced, the output power of the system can be improved, and the water in the electric pile can be discharged more easily by utilizing the action of gravity, so that the problem of flooding of the electric pile during operation is avoided.
2. According to the utility model, the diversion sections are respectively arranged on the cathode plate and close to the inner edges of the air inlet and the air outlet, so that air enters the through holes through the diversion grooves after entering from the air inlet, enters the cathode flow field through the through holes, and water and redundant air generated by the reaction are discharged through the holes and the air outlet.
3. According to the utility model, the mounting notches are arranged at the four corners of the cathode plate, so that the mounting notches can be used as the matching surfaces for limiting when the electric pile is assembled, and the mounting notches can be used as the matching surfaces of the anti-collapse bracket for limiting after the electric pile is assembled, so that the design of the fixture clamp and the anti-collapse structure is simplified, and the electric pile structure after the assembly is more compact.
Drawings
The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:
FIG. 1 is an isometric view of the present utility model;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a rear view of FIG. 1;
FIG. 4 is a schematic cross-sectional view of the air flow passage of FIG. 1;
FIG. 5 is a schematic view of the assembled structure of the present utility model with an assembler;
FIG. 6 is a schematic view of the utility model mated with an anti-collapse bracket;
the labels in the above figures are: 1. the cathode plate is provided with an air inlet, a transition fillet, an air outlet, a cathode flow field, a through flow channel, a diversion trench, a through hole, a diversion section, a straight flow channel, an annular reinforcing boss, an annular sealing groove, an installation notch, an assembly fixture and an anti-collapse bracket.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The specific embodiments of the utility model are as follows: as shown in fig. 1 to 6, the utility model provides a fuel cell cathode flow field plate structure, which comprises a cathode plate 1, wherein an air inlet 2 and an air outlet 3 are respectively arranged on two sides of the cathode plate 1 along the width direction, a straight-through cathode flow field 4 which is connected with the air inlet 2 and the air outlet 3 is arranged on one side of the cathode plate 1, so that the air resistance of air in a flow channel can be reduced, the output power of a system can be improved, water in a galvanic pile can be discharged more easily by utilizing the action of gravity, and the problem that the galvanic pile floods during operation is avoided.
Specifically, two sides of the cathode plate 1 are respectively provided with a plurality of air inlets 2 and a plurality of air outlets 3 along the length direction thereof, and two adjacent air inlets 2 and two adjacent air outlets 3 are communicated through a diversion trench 5. The cathode plate 1 is provided with a plurality of through holes 6 at intervals along the two sides of the width direction, two opposite through holes 6 are communicated with corresponding runners in the cathode flow field 4, and two opposite through holes 6 are respectively arranged at two ends of the corresponding runners, as the periphery of the cathode plate 1 and the periphery of the cathode flow field 4 are both provided with annular sealing grooves 9, the width of each annular sealing groove 9 is 2-3 mm, the depth is 0.35-0.5 mm, sealing strips are arranged in the annular sealing grooves 9, and the arrangement of the through holes 6 avoids the problem that the arrangement of the runners interferes with the installation of the sealing strips.
Specifically, the inner side edges of the cathode plate 1, which are close to the air inlet 2 and the air outlet 3, are respectively provided with a diversion section 7, one end of the diversion section 7 extends to the edges of the air inlet 2 and the air outlet 3 and is communicated with the diversion groove 5, the other end of the diversion section 7 is connected with the cathode flow field 4 through the via hole 6, the diversion section 7 comprises a plurality of spaced direct flow channels 71, the width of the direct flow channels 71 is equal to the width of the flow channels in the cathode flow field 4, each direct flow channel 71 of the diversion section 7, each through hole 6 and each flow channel in the cathode flow field 4 are guaranteed to be in one-to-one correspondence, air can flow smoothly, air resistance in the flow channels can be reduced, and output power of a system is improved. After the air enters from the air inlet 2, the air enters the through hole 6 through the diversion trench 5, enters the cathode flow field 4 through the through hole 6, and the water and the redundant air generated by the reaction are discharged through the hole 6 and the air outlet 3, so that the flow resistance can be reduced by the diversion section 7 in the discharging process, the water is more easily discharged, and the flooding of the galvanic pile during operation is further prevented.
Specifically, the cathode flow field 4 comprises a plurality of spaced through flow channels 41, the width of the through flow channels 41 is 0.6-1 mm, and the depth is 0.35-0.55 mm, so that the air resistance of air in the flow channels can be reduced, and the output power of the system can be improved.
In addition, the outer circumferences of the air inlet 2 and the air outlet 3 are provided with annular reinforcing bosses 8, so that the structural strength of the air inlet 2 and the air outlet 3 is improved, and the problems of deformation and rupture of the outer wall surface due to the pressure action of internal compressed gas are prevented.
The air inlet 2 and the air outlet 3 are both provided with strip-shaped holes, and the corners at the two ends of the air inlet 2 and the air outlet 3 are respectively provided with a transition fillet 21, so that stress concentration at the corners is avoided, and meanwhile, a certain adjusting effect is played on the flow velocity of air, so that the gas entering the flow field is more uniform; wherein the cross sections of the air inlet 2 and the air outlet 3 are 2500-2800 mm 2 It is possible to ensure that the cathode air supply and the discharge of the resultant are within safe flow rates when the stack power is increased to a certain value by superposing the number of single cells.
The negative plate 1 is set to the rectangular plate, and the four corners position department of negative plate 1 all is provided with installation breach 10, and this installation breach 10 can be used as the fitting surface of assembly fixture 11 to carry out spacingly when the electric pile is assembled, and the fitting surface of preventing collapsing support 12 is used to carry out spacingly after the electric pile assembly is accomplished, has simplified the design of frock clamp and preventing collapsing structure for the electric pile structure after the assembly is accomplished is compacter.
In conclusion, the utility model can reduce the air resistance of air in the flow channel, improve the output power of the system, and can easily discharge water in the electric pile by utilizing gravity, thereby avoiding the problem of flooding of the electric pile during operation.
The foregoing is provided by way of illustration of the principles of the present utility model, and is not intended to be limited to the specific constructions and applications illustrated herein, but rather to all modifications and equivalents which may be utilized as fall within the scope of the utility model as defined in the claims.
Claims (10)
1. The structure of the cathode flow field plate of the fuel cell is characterized by comprising a cathode plate, wherein an air inlet and an air outlet are respectively arranged on two sides of the cathode plate along the width direction of the cathode plate, and a straight-through cathode flow field for connecting the air inlet and the air outlet is arranged on one side of the cathode plate.
2. The fuel cell cathode flow field plate structure according to claim 1, wherein: two sides of the cathode plate are respectively provided with a plurality of air inlets and a plurality of air outlets along the length direction of the cathode plate, and two adjacent air inlets are communicated with two adjacent air outlets through guide grooves.
3. A fuel cell cathode flow field plate structure according to claim 2, wherein: and a plurality of through holes are respectively arranged on the cathode plate at intervals along the two sides of the width direction of the cathode plate, two opposite through holes are communicated with corresponding flow passages in the cathode flow field, and the two opposite through holes are respectively arranged at two ends of the corresponding flow passages.
4. A fuel cell cathode flow field plate structure according to claim 2, wherein: the cathode plate is provided with a flow guide section near the inner edges of the air inlet and the air outlet respectively, one end of the flow guide section extends to the edges of the air inlet and the air outlet and is communicated with the flow guide groove, and the other end of the flow guide section is connected with the cathode flow field through a via hole.
5. The fuel cell cathode flow field plate structure according to claim 4, wherein: the flow guiding section comprises a plurality of straight flow channels at intervals, and the width of each straight flow channel is equal to that of the flow channel in the cathode flow field.
6. The fuel cell cathode flow field plate structure according to claim 1, wherein: the cathode flow field comprises a plurality of through flow channels which are spaced, wherein the width of each through flow channel is 0.6-1 mm, and the depth of each through flow channel is 0.35-0.55 mm.
7. The fuel cell cathode flow field plate structure according to claim 1, wherein: the periphery of the air inlet and the air outlet is provided with annular reinforcing bosses.
8. The fuel cell cathode flow field plate structure according to claim 1, wherein: the air inlet and the air outlet are respectively provided with a strip-shaped hole, the corners at the two ends of the air inlet and the air outlet are respectively provided with a transition fillet, and the cross sections of the air inlet and the air outlet are respectively 2500-2800 mm 2 。
9. The fuel cell cathode flow field plate structure according to claim 1, wherein: the periphery of the cathode plate and the periphery of the cathode flow field are both provided with annular sealing grooves, the width of each annular sealing groove is set to be 2-3 mm, the depth is 0.35-0.5 mm, and sealing strips are arranged in the annular sealing grooves.
10. The fuel cell cathode flow field plate structure according to claim 1, wherein: the negative plate is set to the rectangular plate, the four corners position department of negative plate all is provided with the installation breach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320081572.1U CN219419097U (en) | 2023-01-12 | 2023-01-12 | Fuel cell cathode flow field plate structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320081572.1U CN219419097U (en) | 2023-01-12 | 2023-01-12 | Fuel cell cathode flow field plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219419097U true CN219419097U (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320081572.1U Active CN219419097U (en) | 2023-01-12 | 2023-01-12 | Fuel cell cathode flow field plate structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219419097U (en) |
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2023
- 2023-01-12 CN CN202320081572.1U patent/CN219419097U/en active Active
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