CN220856619U - Air-cooled fuel cell bipolar plate - Google Patents
Air-cooled fuel cell bipolar plate Download PDFInfo
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- CN220856619U CN220856619U CN202322624539.1U CN202322624539U CN220856619U CN 220856619 U CN220856619 U CN 220856619U CN 202322624539 U CN202322624539 U CN 202322624539U CN 220856619 U CN220856619 U CN 220856619U
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- plate surface
- plate body
- air
- anode
- grooves
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- 239000000446 fuel Substances 0.000 title claims abstract description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000001257 hydrogen Substances 0.000 claims abstract description 48
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001301 oxygen Substances 0.000 abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 abstract description 10
- 230000000149 penetrating effect Effects 0.000 abstract description 6
- 230000008093 supporting effect Effects 0.000 abstract description 5
- 238000009423 ventilation Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
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- Fuel Cell (AREA)
Abstract
The utility model discloses an air-cooled fuel cell bipolar plate, which comprises a plate body which is integrally in a cuboid shape, wherein two sides of the plate body in the thickness direction are respectively an anode plate surface and a cathode plate surface, air cavities which are arranged in a penetrating manner are arranged at two sides of the plate body in the length direction, an oxygen runner which is arranged in a penetrating manner along the width direction of the plate body is arranged on the cathode plate surface, and a plurality of oxygen runners are arranged at intervals along the length direction of the plate body; the anode plate surface is provided with mixing grooves at two ends of the plate body in the length direction; the anode plate surface is provided with a hydrogen flow passage for hydrogen to flow, and the hydrogen flow passage is connected between the two mixing tanks and is provided with a plurality of hydrogen flow passages at intervals along the width direction of the plate body; the hydrogen flow channel is arranged in a straight line in the length direction of the anode plate surface and is arranged in an S shape in the width direction of the anode plate surface; the anode surface is provided with two hydrogen flow channels which are symmetrically arranged from outside to inside. The utility model has the advantages of full space utilization, good supporting effect, stable hydrogen ventilation and the like.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to an air-cooled fuel cell bipolar plate.
Background
Bipolar plates (Bipolarplate, BPP) are a core component of a fuel cell and are mainly used for supporting the MEA, providing hydrogen and oxygen channels, separating hydrogen and oxygen, collecting electrons, and conducting heat. The bipolar plate is provided with a flow channel designed and processed, so that the reaction medium can be uniformly distributed on the whole electrode, and fluid can be uniformly distributed to the reaction layer of the electrode for electrochemical reaction.
The bipolar plate needs to have the utilization rate of the plate surface and the supporting function in actual processing and application, and theoretically, the larger the contact area between the flow channel and the proton exchange membrane is, the higher the utilization rate is, and the better the performance of the fuel cell is; however, the fuel cell is easy to damage the proton exchange membrane due to the fact that the contact area is large and the support is lacking in the actual assembly and processing process; in addition, the flow channels ensure the same length among the flow channels while ensuring the utilization rate and the supporting function so as to avoid uneven power density of the fuel cell caused by uneven gas flow distribution.
In order to solve the technical problems, the Chinese patent literature discloses an air-cooled fuel cell bipolar plate, the authorized publication number is CN211654949U, the anode surface of the bipolar plate solves the problems of support and utilization rate through parallel linear hydrogen flow channels, but a fan-shaped drainage groove guides hydrogen to two sides, the hydrogen flow channels corresponding to the fan surfaces of the drainage groove are inconsistent with the hydrogen flow channels on the two sides under the action of pressure intensity, the power density of the cell is easy to be uneven, and if one flow channel is blocked in the use process of the flow channel adopting the linear design, the flow channel is difficult to form negative pressure to automatically conduct the blocked flow channel; thus easily causing uneven power density caused by uneven distribution of hydrogen.
Disclosure of utility model
Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: how to provide a bipolar plate with simple structural design, which can ensure the space utilization rate of the bipolar plate, provide support and stabilize the hydrogen.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The bipolar plate of the air-cooled fuel cell comprises a plate body which is integrally in a cuboid shape, wherein anode plate surfaces and cathode plate surfaces are respectively arranged at two sides of the thickness direction of the plate body, air cavities which are arranged in a penetrating manner are arranged at two sides of the length direction of the plate body, oxygen flow passages which are arranged in a penetrating manner along the width direction of the plate body are arranged on the cathode plate surface, and a plurality of oxygen flow passages are arranged at intervals along the length direction of the plate body;
The two ends of the anode plate surface in the length direction of the plate body are provided with mixing grooves, the two mixing grooves are arranged in a central symmetry mode, the mixing grooves are positioned at the inner side of the air cavity, and the mixing grooves penetrate through towards one side of the air cavity; the anode plate surface is provided with a hydrogen flow passage for hydrogen to flow, and the hydrogen flow passage is connected between the two mixing tanks and is provided with a plurality of hydrogen flow passages at intervals along the width direction of the plate body; the hydrogen flow channel is arranged in a straight line in the length direction of the anode plate surface and is arranged in an S shape in the width direction of the anode plate surface; the anode plate surface is provided with two hydrogen flow channels which are arranged from outside to inside and correspond to each other in a central symmetry mode.
By adopting the structure, the anode plate surface and the cathode plate surface are provided with a plurality of hydrogen and oxygen flow channels, so that the utilization rate of the bipolar plate is ensured, the side wall of the flow channel can provide support for the proton exchange membrane, and the probability of damage of the proton exchange membrane can be reduced during processing; the double-click plate is provided with the drainage groove, and the mixing groove is directly connected with the flow channel, so that the blocking of the fan-shaped surface of the drainage groove in a comparison document to the flow channel is avoided, or the uneven power density of the battery caused by inconsistent lengths of the drainage groove is avoided, in addition, the hydrogen flow channel on the anode plate surface is arranged in an S shape in the width direction, thus, liquid water generated by the reaction of the fuel cell is easily discharged under negative pressure in the flow channel, the uneven power density distribution of the battery caused by lower hydrogen passing caused by the blockage of the flow channel is avoided, and the stable hydrogen passing of the flow channel is ensured; the bipolar plate adopts a plurality of S-shaped flow channels, so that the conditions that the gas concentration of the second half section of the flow channel is too small, the current density is reduced and the flow channel is flooded due to the fact that the gas pressure loss is too large caused by overlong single S-shaped flow channels are avoided; therefore, the air cavity on the stable bipolar plate for introducing hydrogen in the flow channel is further improved to penetrate through one side of the mixing tank, the discharge pressure in the flow channel and the mixing tank during hydrogen introducing or water discharging is reduced, and the damage probability of the proton exchange membrane caused by overlarge pressure is reduced.
Further, annular sealing grooves are formed in the anode plate surface and the cathode plate surface, the caliber of each sealing groove in the anode plate surface is larger than the maximum distance between the two air cavities, two sealing grooves are formed in the cathode plate surface along the length direction, the calibers of the two sealing grooves are respectively larger than the calibers of the corresponding air cavities, and the corresponding air cavities are wrapped in the sealing grooves; sealing rings are correspondingly inlaid in the sealing grooves, and sealing gaskets are arranged on the upper covers of the mixing grooves.
Therefore, the sealing groove and the sealing ring are arranged to ensure the air tightness of the flow channel between the bipolar plates after being stacked and assembled, and hydrogen leakage is prevented.
Further, the plate body is made of graphite or metal materials.
Furthermore, the edges and corners on the plate body are arranged in a chamfering mode.
Further, the thickness of the plate body is 1.5-2.5 mm.
Thus, the processing hardness of the bipolar plate is ensured, and meanwhile, the space is saved.
In conclusion, the utility model has the advantages of full space utilization, good supporting effect, stable hydrogen ventilation and the like.
Drawings
Fig. 1 and 3 are schematic perspective views of bipolar plates of an air-cooled fuel cell.
Fig. 2 is a schematic view of a partial enlarged structure of fig. 1.
Fig. 4 is a schematic view of a partially enlarged structure of fig. 3.
Fig. 5 is a schematic plan view of a cathode plate surface of a bipolar plate of a fuel cell.
Fig. 6 is a schematic plan view of the anode surface of a bipolar plate of a fuel cell.
Detailed Description
The present utility model will be described in further detail with reference to examples.
As shown in fig. 1 to 6, the air-cooled fuel cell bipolar plate comprises a plate body 1 which is in a cuboid shape as a whole, wherein two sides of the plate body 1 in the thickness direction are respectively provided with an anode plate surface 11 and a cathode plate surface 12, two sides of the plate body 1 in the length direction are provided with air cavities 13 which are arranged in a penetrating manner, the cathode plate surface 12 is provided with oxygen flow channels 121 which are arranged in a penetrating manner along the width direction of the plate body 1, and a plurality of oxygen flow channels 121 are arranged at intervals along the length direction of the plate body 1;
The anode plate surface 11 is provided with mixing grooves 111 at two ends of the plate body 1 in the length direction, the two mixing grooves 111 are arranged in a central symmetry manner, the mixing grooves 111 are positioned at the inner side of the air cavity 13, and the mixing grooves 111 penetrate towards one side of the air cavity 13; a hydrogen flow passage 112 through which hydrogen flows is provided on the anode plate surface 11, and the hydrogen flow passage 112 is connected between the two mixing tanks 111 and is provided with a plurality of hydrogen flow passages at intervals along the width direction of the plate body 1; the hydrogen flow channels 112 are arranged in a straight line in the length direction of the anode plate surface 11 and are arranged in an S-shape in the width direction of the anode plate surface 11; the two hydrogen flow channels 112 on the anode plate 11 are arranged in a central symmetry manner from outside to inside.
When in implementation, the cathode and anode electrodes of the bipolar plates are mutually corresponding and are overlapped and fixed together to form a bare stack of the fuel cell stack; the proton exchange membrane is clamped between the cathode plate surfaces and the anode plate surfaces of the two bipolar plates, and a plurality of hydrogen and oxygen flow channels are arranged on the anode plate surfaces and the cathode plate surfaces, so that the proton exchange membrane can be supported by the side walls of the flow channels while the utilization rate of the bipolar plates is ensured, and the probability of damage of the proton exchange membrane can be reduced during processing; the double-click plate is provided with the drainage grooves, and the mixing grooves are directly connected with the flow channels, so that the situation that the flow channels are blocked by sector-shaped surface of the drainage grooves in the comparison document, the drainage grooves cannot be in one-to-one correspondence with the flow channels, or the power density of the battery is uneven due to inconsistent lengths of the drainage grooves is avoided, in addition, the hydrogen flow channels on the surface of the external anode plate are arranged in an S shape in the width direction, liquid water generated by the fuel cell reaction is easily discharged in the flow channels by negative pressure, the phenomenon that the power density distribution of the battery is uneven due to lower hydrogen passing caused by the blockage of the flow channels is avoided, and the stable hydrogen passing of the flow channels is ensured; the bipolar plate adopts a plurality of S-shaped flow channels, so that the conditions that the gas concentration of the second half section of the flow channel is too small, the current density is reduced and the flow channel is flooded due to the fact that the gas pressure loss is too large caused by overlong single S-shaped flow channels are avoided; therefore, the air cavity on the stable bipolar plate for introducing hydrogen in the flow channel is further improved to penetrate through one side of the mixing tank, the discharge pressure in the flow channel and the mixing tank during hydrogen introducing or water discharging is reduced, and the damage probability of the proton exchange membrane caused by overlarge pressure is reduced.
Specifically, in order to ensure the air tightness during the hydrogen supply; as shown in fig. 2 and fig. 4, annular seal grooves 113 are respectively arranged on the anode plate surface 11 and the cathode plate surface 12, the caliber of each seal groove 113 on the anode plate surface 11 is larger than the maximum distance between two air cavities 13, two seal grooves 113 on the cathode plate surface 12 are arranged along the length direction, the calibers of the two seal grooves 113 are respectively larger than the calibers of the corresponding air cavities 13, and the corresponding air cavities 13 are wrapped in the seal grooves; sealing rings are correspondingly inlaid in the sealing grooves 113, and sealing gaskets are arranged on the upper covers of the mixing grooves.
In practice, the material of the plate body 1 is made of graphite or a metallic material. The edges and corners on the plate body 1 are arranged in a chamfering mode.
The thickness of the plate body 1 is 1.5 mm to 2.5 mm. In practice, bipolar plates with a thickness of 2 mm are preferred, which can better ensure a space-saving thickness and increase the hardness during processing.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (5)
1. The air-cooled fuel cell bipolar plate comprises a plate body (1) which is integrally in a cuboid shape, wherein the two sides of the plate body (1) in the thickness direction are an anode plate surface (11) and a cathode plate surface (12) respectively;
The anode plate surface (11) is provided with mixing grooves (111) at two ends of the plate body (1) in the length direction, the two mixing grooves (111) are arranged in a central symmetry mode, the mixing grooves (111) are positioned at the inner side of the air cavity (13), and the mixing grooves (111) penetrate towards one side of the air cavity (13); the anode plate surface (11) is provided with a hydrogen flow passage (112) for hydrogen to flow, and the hydrogen flow passage (112) is connected between the two mixing tanks (111) and is provided with a plurality of hydrogen flow passages at intervals along the width direction of the plate body (1); the hydrogen flow channel (112) is arranged in a straight line in the length direction of the anode plate surface (11) and is arranged in an S shape in the width direction of the anode plate surface (11); the anode plate surface (11) is provided with two hydrogen flow channels (112) which are arranged from outside to inside and are symmetrical in center.
2. The air-cooled fuel cell bipolar plate according to claim 1, wherein annular seal grooves (113) are arranged on the anode plate surface (11) and the cathode plate surface (12), the caliber of each seal groove (113) on the anode plate surface (11) is larger than the maximum distance between two air cavities (13), two seal grooves (113) on the cathode plate surface (12) are arranged along the length direction, and the calibers of the two seal grooves (113) are respectively larger than the calibers of the corresponding air cavities (13) and wrap the corresponding air cavities (13) therein; sealing rings are correspondingly inlaid in the sealing grooves (113), and sealing gaskets are arranged on the upper covers of the mixing grooves.
3. An air-cooled fuel cell bipolar plate according to claim 2, wherein the material of the plate body (1) is made of graphite or a metallic material.
4. An air-cooled fuel cell bipolar plate according to claim 2, wherein the corners of the plate body (1) are chamfered.
5. An air-cooled fuel cell bipolar plate according to claim 2, wherein the thickness of the plate body (1) is 1.5-2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322624539.1U CN220856619U (en) | 2023-09-26 | 2023-09-26 | Air-cooled fuel cell bipolar plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322624539.1U CN220856619U (en) | 2023-09-26 | 2023-09-26 | Air-cooled fuel cell bipolar plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220856619U true CN220856619U (en) | 2024-04-26 |
Family
ID=90741329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322624539.1U Active CN220856619U (en) | 2023-09-26 | 2023-09-26 | Air-cooled fuel cell bipolar plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220856619U (en) |
-
2023
- 2023-09-26 CN CN202322624539.1U patent/CN220856619U/en active Active
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| GR01 | Patent grant |