CN117374310A - Polar plate runner structure for increasing gas flow velocity and gradient flow resistance and fuel cell - Google Patents
Polar plate runner structure for increasing gas flow velocity and gradient flow resistance and fuel cell Download PDFInfo
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- CN117374310A CN117374310A CN202311389483.4A CN202311389483A CN117374310A CN 117374310 A CN117374310 A CN 117374310A CN 202311389483 A CN202311389483 A CN 202311389483A CN 117374310 A CN117374310 A CN 117374310A
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- port
- runner
- gradient
- flow channel
- gas flow
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- 239000000446 fuel Substances 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 3
- 206010013496 Disturbance in attention Diseases 0.000 abstract description 10
- 238000009792 diffusion process Methods 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 239000000306 component Substances 0.000 description 5
- 239000012495 reaction gas Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The application provides a polar plate runner structure for increasing gas flow velocity and gradient flow resistance, which comprises a polar plate body, wherein a plurality of runners which are parallel to each other are arranged on one side surface of the polar plate body; a runner ridge is arranged between two adjacent runners; each flow channel comprises a first port, a flow channel body and a second port which are sequentially connected; a plurality of protrusions are arranged in the runner body, and the protrusions are mutually independent; the width of each protrusion is smaller than the width of the runner body, and the height of each protrusion is lower than the height of the runner ridge. The application also provides a fuel cell. This application is through setting up the arch in the direct current way for the gas flow direction diffusion layer that can be more abundant can effectively increase reaction rate, thereby makes concentration loss diminish. Meanwhile, the protrusions are arranged at equal intervals, gradient flow resistance can be achieved, and flooding caused by backflow can be effectively avoided.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a polar plate flow channel structure for increasing gas flow velocity and gradient flow resistance and a fuel cell.
Background
Fuel cells have many advantages such as cleanliness and efficiency, and have received increased attention. The bipolar plate serves as a core component of the fuel cell, and plays important roles in distributing gas, conducting electricity and heat, draining water and the like in the fuel cell.
The performance of the plates depends to a large extent on the flow field structure. Currently, flow fields generally include conventional flow fields and new flow fields; conventional traditional flow fields comprise straight channels, snakes, interdigital type and the like, and novel flow fields comprise bionic flow fields, spiral smooth flow fields, 3D flow fields and the like. The straight channel flow field is the most basic flow field, generally has more flow field channels which are parallel to each other, has short flow field distance and small inlet and outlet pressure loss, is connected in parallel to be beneficial to the uniform distribution of reaction gas and cooling water in the channels, can realize the uniform distribution of current density and battery temperature, and has simple structure and easy processing. However, the residence time of the reaction gas in the flow field of the direct current channel is short, the gas utilization rate is low, the gas flow rate is relatively low, the reaction gas cannot sufficiently flow to the diffusion layer, and the gas utilization rate is low; and the produced water can not be discharged in time, and is easy to flow back to cause flooding. In addition, the polar plate of the high-power galvanic pile structure is larger in volume and longer in flow channel, and the problems of larger gas pressure drop and outlet gas backflow caused by phenomena of gas shortage and gas reflection are more likely to occur.
Disclosure of Invention
The embodiment of the invention provides a polar plate flow channel structure for increasing gas flow rate and gradient flow resistance and a fuel cell, and aims to solve the problems that the existing reaction gas has short residence time in a direct flow channel flow field, low gas utilization rate, relatively low gas flow rate, insufficient flow direction to a diffusion layer, incapability of timely discharging generated water, easy backflow to cause flooding and the like.
In order to solve the above-mentioned problems, a primary object of the embodiments of the present invention is to provide a plate flow channel structure for increasing gas flow rate and gradient flow resistance, which comprises a plate body, wherein a plurality of flow channels parallel to each other are provided on one side surface of the plate body; a runner ridge is arranged between two adjacent runners; each flow channel comprises a first port, a flow channel body and a second port which are sequentially connected;
a plurality of protrusions are arranged in the runner body, and the protrusions are mutually independent; the width of each protrusion is smaller than the width of the runner body, and the height of each protrusion is lower than the height of the runner ridge.
As a preferred embodiment, the flow channel is a direct flow channel; the plurality of protrusions in the same runner body are arranged at equal intervals.
As a preferred embodiment, the protrusions at the same position in different flow path bodies are located on the same straight line.
In a preferred embodiment, the protrusion near the first port is disposed on the inner side of the first port, and the protrusion near the second port is disposed on the outer side of the second port. In this application, inner refers to a side close to the flow channel body, and outer refers to a side far from the flow channel body.
As a preferred embodiment, each of the protrusions includes an integrally provided inclined surface and a vertical surface; the inclined surface is arranged facing the first port, and the vertical surface is arranged facing the second port.
As a preferable implementation mode, the angle formed by the inclined plane and the plane of the bottom surface of the flow channel body is more than or equal to 45 degrees, and the angle formed by the vertical plane and the plane of the bottom surface of the flow channel body is 90 degrees.
As a preferred embodiment, the direction from the first port to the second port is a gas acceleration direction. In this way, since the protrusions are arranged in the flow channel body, a velocity component exists in the plane direction perpendicular to the flow channel, so that oxygen (air) can enter the catalytic layer in a convection mode perpendicular to the plane of the flow channel body, and as the current density is gradually increased, the oxygen (air) transmission capacity is enhanced, and the concentration loss is reduced.
In a preferred embodiment, the direction from the second port to the first port is a fluid blocking direction. Since the vertical surface of the protrusion faces the second port, the resistance to the fluid is large in comparison with the plane, and the function of blocking the backflow of the fluid can be achieved.
As a preferred embodiment, the first port, the flow channel body and the second port are integrally formed.
Another object of the present invention is to provide a fuel cell, which is manufactured by the above-mentioned polar plate runner structure for increasing gas flow rate and gradient flow resistance.
Compared with the prior art, the invention has the following beneficial effects: this application is through setting up the arch in the direct current way to make bellied inclined plane set up towards first port, perpendicular face set up towards the second port, there is the velocity component in the plane direction of perpendicular to runner, make oxygen (air) can be perpendicular to runner body plane, get into the catalysis layer with convection current form, along with current density increases gradually, oxygen (air) transmission capacity reinforcing, the gas velocity of flow increases, make the more abundant flow direction diffusion layer of gas, can effectively increase reaction rate, thereby make concentration loss diminish. Meanwhile, the protrusions are arranged at equal intervals, gradient flow resistance can be achieved, and flooding caused by backflow can be effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a plate flow channel structure for increasing gas flow rate and gradient flow resistance according to an embodiment of the present invention;
FIG. 2 is a schematic view of another angle of the plate flow channel structure of FIG. 1 for increasing gas flow rate and gradient flow resistance;
FIG. 3 is a schematic view of a protrusion of the plate flow channel structure of FIG. 1 for increasing gas flow rate and gradient flow resistance.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top, bottom … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Specifically, referring to fig. 1 to 3, an embodiment of the present invention provides a plate flow channel structure for increasing gas flow rate and gradient flow resistance, which includes a plate body 10, wherein a side surface of the plate body 10 is provided with a plurality of flow channels 20 parallel to each other; a flow passage ridge 30 is arranged between two adjacent flow passages 20; each flow channel 20 comprises a first port 21, a flow channel body 22 and a second port 23 which are sequentially connected;
a plurality of protrusions 40 are arranged in the runner body 22, and the protrusions 40 are mutually independent; the width of each protrusion 40 is smaller than the width of the flow channel body 22, and the height of each protrusion 40 is lower than the height of the flow channel ridge 30.
By arranging the protrusions in the direct current channel and controlling the width of each protrusion 40 to be smaller than the width of the flow channel body 22 and the height of each protrusion 40 to be smaller than the height of the flow channel ridge 30, oxygen (air) enters the catalytic layer in a convection mode, along with the gradual increase of current density, the oxygen (air) transmission capacity is enhanced, the gas flow rate is increased, the gas flows to the diffusion layer more fully, the reaction rate can be effectively increased, and thus the concentration loss is reduced. In the embodiment of the application, the width and depth of the flow channel can be set according to the actual use requirement so as to match the requirements of different flow requirements.
As a preferred embodiment, the flow channel 20 is a straight flow channel; the plurality of protrusions 40 in the same flow channel body 22 are disposed at equal intervals. The protrusions 40 in the same runner body 22 are arranged at equal intervals, so that gradient flow resistance can be realized, and flooding caused by backflow phenomenon can be effectively avoided.
As a preferred embodiment, the protrusions 40 at the same location within different flow channel bodies 22 are on the same line. Therefore, the uniformity of the transmission of the reaction gas can be ensured, the gas flows to the diffusion layer more fully, the reaction rate can be effectively increased, and the concentration loss is reduced.
As a preferred embodiment, the protrusion 40 near the first port 21 is disposed at the inner side of the first port 21, and the protrusion 40 near the second port 23 is disposed at the outer side of the second port 23. In this application, the inner side refers to the side close to the flow path body 22, and the outer side refers to the side far from the flow path body 22. Thus, the gas flows to the diffusion layer more fully, the reaction rate can be effectively increased, and the concentration loss is reduced.
As a preferred embodiment, each of the protrusions 40 includes an integrally provided inclined surface 41 and a vertical surface 42; the inclined surface 41 is disposed facing the first port 21, and the vertical surface 42 is disposed facing the second port 23. Thus, the gas flows to the diffusion layer more fully, the reaction rate can be effectively increased, and the concentration loss is reduced.
As a preferred embodiment, the angle formed by the inclined surface 41 and the plane of the bottom surface of the flow channel body 22 is greater than or equal to 45 degrees (for example, 45 degrees, or 60 degrees, or 75 degrees, etc. according to practical needs), and the angle formed by the vertical surface 42 and the plane of the bottom surface of the flow channel body 22 is 90 degrees. Thus, the gas flows to the diffusion layer more fully, the reaction rate can be effectively increased, and the concentration loss is reduced.
As a preferred embodiment, the direction from the first port 21 to the second port 23 is a gas acceleration direction. In this way, since the protrusions 40 are provided in the flow path body 22, there is a velocity component in a direction perpendicular to the plane of the flow path body, so that oxygen (air) can enter the catalytic layer in a convection manner perpendicular to the plane of the flow path body 22, and as the current density gradually increases, the oxygen (air) transmission capacity is enhanced and the concentration loss becomes small.
As a preferred embodiment, the direction from the second port 23 to the first port 21 is the fluid blocking direction. Since the vertical surface of the protrusion 40 faces the second port 23, the vertical surface 42 has a large resistance to the fluid relative to the plane, and can well function as a barrier to the backflow of the fluid.
As a preferred embodiment, the first port 21, the flow channel body 22 and the second port 23 are integrally formed. By the arrangement, the preparation process can be simplified, and the residual cost can be well reduced.
Another objective of the embodiments of the present invention is to provide a fuel cell, which is manufactured by the above-mentioned polar plate runner structure for increasing gas flow rate and gradient flow resistance.
Compared with the prior art, the invention has the following beneficial effects: this application is through setting up the arch in the direct current way to make bellied inclined plane set up towards first port, perpendicular face set up towards the second port, there is the velocity component in the plane direction of perpendicular to runner, make oxygen (air) can be perpendicular to runner body plane, get into the catalysis layer with convection type, along with current density increases gradually, oxygen (air) transmission capacity reinforcing, the gas velocity of flow increases, make the more abundant flow direction diffusion layer of gas, can preferentially increase reaction rate, thereby make concentration loss diminish. Meanwhile, the protrusions are arranged at equal intervals, gradient flow resistance can be achieved, and flooding caused by backflow can be effectively avoided.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The polar plate runner structure for increasing gas flow speed and gradient flow resistance is characterized by comprising a polar plate body, wherein a plurality of runners which are parallel to each other are arranged on one side surface of the polar plate body; a runner ridge is arranged between two adjacent runners; each flow channel comprises a first port, a flow channel body and a second port which are sequentially connected;
a plurality of protrusions are arranged in the runner body, and the protrusions are mutually independent; the width of each protrusion is smaller than the width of the runner body, and the height of each protrusion is lower than the height of the runner ridge.
2. The plate runner structure for increasing gas flow rate and gradient flow resistance according to claim 1, wherein the runner is a direct current runner; the plurality of protrusions in the same runner body are arranged at equal intervals.
3. The plate flow channel structure for increasing gas flow rate and gradient resistance according to claim 2, wherein the protrusions at the same position in different flow channel bodies are located on the same straight line.
4. The plate flow channel structure for increasing gas flow rate and gradient flow resistance according to claim 1, wherein the protrusion near the first port is disposed on an inner side of the first port, and the protrusion near the second port is disposed on an outer side of the second port.
5. The plate flow channel structure for increasing gas flow rate and gradient resistance according to claim 3, wherein each of the protrusions comprises an integrally provided inclined surface and a vertical surface; the inclined surface is arranged facing the first port, and the vertical surface is arranged facing the second port.
6. The polar plate runner structure for increasing gas flow rate and gradient flow resistance according to claim 5, wherein an angle formed by the inclined plane and a plane of the runner body bottom surface is equal to or more than 45 degrees, and an angle formed by the vertical plane and a plane of the runner body bottom surface is 90 degrees.
7. The plate flow channel structure for increasing gas flow rate and gradient flow resistance of claim 6, wherein the direction from the first port to the second port is a gas acceleration direction.
8. The plate flow channel structure for increasing gas flow rate and gradient flow resistance of claim 7, wherein the direction from the second port to the first port is a fluid flow resistance direction.
9. The plate runner structure for increasing gas flow rate and gradient flow resistance according to claim 1, wherein the first port, the runner body and the second port are integrally formed.
10. A fuel cell prepared from the plate flow channel structure for increasing gas flow rate and gradient flow resistance of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311389483.4A CN117374310A (en) | 2023-10-24 | 2023-10-24 | Polar plate runner structure for increasing gas flow velocity and gradient flow resistance and fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311389483.4A CN117374310A (en) | 2023-10-24 | 2023-10-24 | Polar plate runner structure for increasing gas flow velocity and gradient flow resistance and fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117374310A true CN117374310A (en) | 2024-01-09 |
Family
ID=89396220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311389483.4A Pending CN117374310A (en) | 2023-10-24 | 2023-10-24 | Polar plate runner structure for increasing gas flow velocity and gradient flow resistance and fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117374310A (en) |
-
2023
- 2023-10-24 CN CN202311389483.4A patent/CN117374310A/en active Pending
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