CN114388837A - Fuel cell flow passage structure based on wing-shaped flow guide - Google Patents
Fuel cell flow passage structure based on wing-shaped flow guide Download PDFInfo
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- CN114388837A CN114388837A CN202111465802.6A CN202111465802A CN114388837A CN 114388837 A CN114388837 A CN 114388837A CN 202111465802 A CN202111465802 A CN 202111465802A CN 114388837 A CN114388837 A CN 114388837A
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- 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
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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- 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
- H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
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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 invention discloses a fuel cell flow channel structure based on wing-shaped flow guide, which comprises a cell flow channel formed by slotting on a flow field plate, wherein the cell flow channel comprises a flow channel inlet, a flow channel outlet and a wing-shaped flow guide block in the flow channel. The structure of the battery flow channel is as follows: and a wing-shaped flow guide block is arranged in the parallel straight flow channel along the direction of the battery flow channel, the flow channel is locally divided into an upper part and a lower part by the flow guide block, and reaction gas is divided under the action of the wing-shaped flow guide block when flowing through the flow guide block. The invention increases the air flow speed of the upper flow channel under the condition that the pressure drop of the inlet and the outlet of the flow channel is slightly increased, establishes the pressure difference between the upper flow channel and the lower flow channel and between the adjacent flow channels, strengthens the mass transfer of reaction gas under the ridge, improves the concentration and the distribution uniformity of oxygen under the ridge by the wing-shaped branch flow channel, and improves the performance of the whole fuel cell. The invention has simple structure and easy processing, and the pressure drop increase of the inlet and the outlet of the flow channel provided with the wing-shaped flow guide block is very small and is far smaller than the pressure drop of the inlet and the outlet of the snake-shaped flow channel.
Description
Technical Field
The invention relates to the technical field of electrochemical fuel cells, in particular to a fuel cell flow channel structure based on wing-shaped flow guide.
Background
The proton exchange membrane fuel cell is a high-efficiency and environment-friendly electrochemical reaction power device, can directly convert chemical energy stored in fuel into electric energy, and the byproduct of the proton exchange membrane fuel cell is only water. In recent years, due to the advantages of zero emission, low working temperature, rapid response, high power density, high energy conversion efficiency, short hydrogenation time and the like, the proton exchange membrane fuel cell has attracted extensive attention in the field of electric automobiles.
In the process of operating the proton exchange membrane fuel cell, the flow field plate mainly plays a role in distributing reaction gas and simultaneously discharging water generated by a cathode. Poor flow field design can lead to the phenomena of uneven distribution of reaction gas inside the fuel cell, local hot spots, unstable current density, flooding and the like. Therefore, the optimal design of the flow field structure of the cathode of the fuel cell is an important means for improving the distribution uniformity of the reaction gas, improving the water discharge capacity of the liquid state and further improving the performance of the cell.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a fuel cell flow channel structure based on wing-shaped flow guiding, which comprises a cell flow channel formed by slotting on a flow field, wherein the cell flow channel comprises a flow channel inlet, a flow channel outlet and wing-shaped flow guiding blocks in the flow channel. The structure of the battery flow channel is as follows: and a wing-shaped flow guide block is arranged in the parallel straight flow channel along the direction of the battery flow channel, the flow channel is locally divided into an upper part and a lower part by the flow guide block, and reaction gas is divided under the action of the wing-shaped flow guide block when flowing through the flow guide block. The invention increases the air flow speed of the upper flow channel under the condition that the pressure drop of the inlet and the outlet of the flow channel is slightly increased, and establishes the pressure difference between the upper flow channel and the lower flow channel and between the adjacent flow channels, thereby strengthening the mass transfer of reaction gas under the ridge, and the existence of the wing-shaped branch flow channel improves the oxygen concentration and the distribution uniformity under the ridge, thereby improving the performance of the whole fuel cell. The invention has simple structure and easy processing, and compared with the traditional parallel straight flow channel and corrugated flow channel, the pressure drop increase of the inlet and the outlet of the flow channel provided with the wing-shaped flow guide block is very small and is far smaller than the pressure drop of the inlet and the outlet of the snake-shaped flow channel.
In order to achieve the above purpose, the invention provides the following technical scheme:
a fuel cell flow channel structure based on foil flow guidance of the present invention comprises,
a flow field plate having a flow channel inlet and a flow channel outlet,
at least one fuel cell flow channel disposed between the flow channel inlet and the flow channel outlet, the fuel cell flow channel including an upper surface and a lower surface extending in a gas flow direction,
at least one wing-shaped deflector disposed in the fuel cell flow channel to divide the fuel cell flow channel into an upper flow channel and a lower flow channel at a predetermined included angle such that gas is divided as it flows through the wing-shaped deflector, the wing-shaped deflector comprising a first base surface parallel to the direction of gas flow and a second base surface opposite to the first base surface, the second base surface being a combination of a flat surface and a curved surface, the first base surface being a flat surface.
In the fuel cell flow channel structure based on wing-shaped flow guide, the second bottom surface is a combination of a straight line and a tangent arc, the included angle between the straight line and the first bottom surface is equal to the preset included angle, and the included angle between the tangent at the tail end of the tangent arc and the first bottom surface is larger than the preset included angle.
In the fuel cell flow channel structure based on wing-shaped flow guide, the preset included angle is 30 degrees, and the included angle between the tangent line at the tail end of the tangent line arc and the first bottom surface is 45-75 degrees.
In the fuel cell flow channel structure based on wing-shaped flow guide, the length of the first bottom surface is 2 mm.
In the fuel cell flow passage structure based on wing-shaped flow guide, the width and the height of the fuel cell flow passage are both 0.9mm, the width of the upper flow passage is 0.2-0.7mm, and the width of the lower flow passage is 0.7-0.2 mm.
In the fuel cell flow channel structure based on the wing-shaped flow guide, the first bottom surface is parallel and close to the lower surface, and the second bottom surface is close to the upper surface.
In the fuel cell flow channel structure based on wing-shaped flow guiding, the shape and the structure of the corresponding part of the second bottom surface and the upper surface are the same.
In the fuel cell flow channel structure based on the wing-shaped flow guide, the fuel cell flow channel comprises a parallel straight flow channel, a corrugated flow channel, a snake-shaped flow channel or an interdigitated flow channel.
In the technical scheme, the fuel cell flow channel structure based on the wing-shaped diversion provided by the invention has the following beneficial effects: the fuel cell flow passage structure based on the wing-shaped diversion increases the air flow speed of the upper flow passage and establishes the pressure difference between the upper flow passage and the lower flow passage and between the adjacent flow passages under the condition that the pressure drop of the inlet and the outlet of the flow passage is increased slightly, so that the mass transfer of reaction gas under the ridge is enhanced, the concentration and the distribution uniformity of oxygen under the ridge are improved due to the wing-shaped branch flow passages, and the performance of the whole fuel cell is improved. The invention has simple structure and easy processing, and compared with the traditional parallel straight flow channel and corrugated flow channel, the pressure drop increase of the inlet and the outlet of the flow channel provided with the wing-shaped flow guide block is very small and is far smaller than the pressure drop of the inlet and the outlet of the snake-shaped flow channel. The flow channel of the proton exchange membrane fuel cell has simple structure, is easy to machine and can not cause extra cost. More importantly, the structure can improve the oxygen concentration of the cathode catalyst layer, improve the uniformity of oxygen distribution, strengthen the mass transfer of oxygen under the ridges of the flow field plate of the fuel cell, prevent the phenomenon of insufficient oxygen in the reaction area of the electrode and improve the performance of the fuel cell.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural view of a fuel cell flow channel structure based on foil flow guidance;
FIG. 2 is a schematic view of an airfoil shaped flow guide block for an embodiment of an airfoil shaped flow guide based fuel cell flow channel configuration;
FIGS. 3(a), 3(b), and 3(c) are schematic flow channel configurations of an embodiment of a fuel cell flow channel configuration based on foil flow guidance;
FIG. 4 is a schematic comparison of cell performance effects for an embodiment of a fuel cell flow channel configuration based on foil flow guidance;
FIG. 5 is a schematic diagram comparing average oxygen concentrations in cathode catalyst layers for an embodiment of a fuel cell flow channel configuration based on foil flow guidance;
FIG. 6 is a comparison cloud of the oxygen concentration distribution in the cathode catalytic layer of an embodiment of a fuel cell flow channel configuration based on foil flow guidance;
fig. 7 is a graph comparing inlet and outlet pressure drop of a flow channel for an embodiment of a fuel cell flow channel configuration based on foil flow guidance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to fig. 1 to 7 of the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
In one embodiment, as shown in fig. 1-7, a fuel cell flow channel structure based on foil flow guidance includes,
a flow field plate 1 having a flow channel inlet 2 and a flow channel outlet 3,
at least one fuel cell flow channel, which is arranged between the flow channel inlet 2 and the flow channel outlet 3, the fuel cell flow channel comprising an upper surface 4 and a lower surface 5 extending in the gas flow direction, further the upper surface 4 is parallel to the gas flow direction, (the upper surface is a curved surface, the gas flow direction is the flow channel direction from left to right, the corresponding gas flow direction of the upper surface is also just curved)
At least one wing-shaped flow deflector 6 arranged in the fuel cell flow channel to divide the fuel cell flow channel into an upper flow channel 7 and a lower flow channel 8 at a predetermined angle such that gas is diverted by flowing through the wing-shaped flow deflector 6, the wing-shaped flow deflector 6 comprising a first base surface 9 parallel to the gas flow direction and a second base surface 10 opposite to the first base surface 9, the second base surface 10 being a combination of a plane and a curved surface, the first base surface 9 being a plane.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the second bottom surface 10 is a combination of a straight line and a tangent arc, an included angle between the straight line and the first bottom surface 9 is equal to the predetermined included angle, and an included angle between a tangent at the tail end of the tangent arc and the first bottom surface 9 is greater than the predetermined included angle.
In a preferred embodiment of the fuel cell flow channel structure based on foil flow guidance, the predetermined included angle is 30 °, the included angle between the tangent at the end of the tangent arc and the first bottom surface is 45 ° to 75 °, and further preferably, the included angle between the tangent at the end of the tangent arc and the first bottom surface is 60 °.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the length of the first bottom surface 9 is 2 mm.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the second bottom surface 10 and the corresponding part of the upper surface 4 have the same shape and structure, and can be completely matched.
In a preferred embodiment of the fuel cell flow channel structure based on the wing-shaped diversion, the width and the height of the fuel cell flow channel are both 0.9mm, the width of the upper flow channel 7 is 0.2-0.7mm, and the width of the lower flow channel 8 is 0.7-0.2 mm.
In a preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the fuel cell flow channel includes a parallel straight flow channel, a corrugated flow channel, a serpentine flow channel or an interdigitated flow channel.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the first bottom surface 9 is parallel to and close to the lower surface 5, and the second bottom surface 10 is close to the upper surface 4.
In the preferred embodiment of the fuel cell channel structure based on the airfoil flow guide, the upper flow channels 7 have flow field ridges whose shapes are consistent with the shapes of the second bottom surfaces 10.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the first bottom surface 9 is parallel and close to the upper surface 4, the second bottom surface 10 is close to the lower surface 5, and the upper flow channel 7 has a flow field ridge with the shape consistent with that of the second bottom surface 10.
In the preferred embodiment of the fuel cell flow channel structure based on the wing-shaped flow guide, the fuel cell flow channel includes the wing-shaped flow guide blocks 6 that are arranged at intervals, the first bottom surfaces 9 are parallel and close to the lower surface 5, and the second bottom surfaces 10 are close to the lower surface 5, and the wing-shaped flow guide blocks 6 that are arranged at intervals, the first bottom surfaces 9 are parallel and close to the upper surface 4, and the second bottom surfaces 10 are close to the lower surface 5.
In one embodiment, the fuel cell flow channel structure based on the wing-shaped flow guide comprises a cell flow channel arranged on a flow field plate 1, a wing-shaped flow guide block 6 is arranged between an inlet 2 and an outlet 3 of the cell flow channel on the flow field plate 1, the flow guide block 6 locally divides the flow channel into an upper part and a lower part which form a certain included angle, and reaction gas is divided under the action of the wing-shaped flow guide block 6 when flowing through the wing-shaped flow guide block.
In the fuel cell flow channel structure based on the wing-shaped flow guide, the flow guide block 6 is similar to a wing shape, the lower bottom edge of a first bottom surface 9 of the lower bottom surface is a straight line parallel to the gas flowing direction, the length of the flow guide block is 2mm, the upper bottom edge of a second bottom surface 10 of the upper bottom surface is a combination of the straight line and a tangent arc, the included angle between the front end straight line part and the lower bottom edge of the upper bottom edge of the wing-shaped flow guide block 6 is 30 degrees, and the included angle between the tangent line of the tangent arc at the tail end and the lower bottom edge is 45-75 degrees. The upper bottom edge of the flow guide block 6 is identical to the corresponding part of the flow field ridge in structure shape and can be completely matched. The airfoil-shaped flow-directing fuel cell flow channel structure has the same ratio of troughs to ridges as parallel flow channels.
In the fuel cell flow passage structure based on the wing-shaped flow guide, the number of the cell flow passage wing-shaped flow guide blocks 6 is 1-4000, and the flow guide blocks are arranged according to the active area of a cell. The width and the height of the runner are both 0.9mm, the width of the upper runner is 0.2-0.7mm, and the width of the lower runner is 0.7-0.2 mm. The wing-shaped flow guide block 6 can be arranged in various flow channels such as a parallel straight flow channel, a corrugated flow channel, a snake-shaped flow channel, an interdigitated flow channel and the like.
In the fuel cell flow channel structure based on the wing-shaped flow guide, the wing-shaped flow guide blocks 6 arranged in a single flow channel are sequentially arranged, and the wing-shaped flow guide blocks 6 arranged between adjacent flow channels can be arranged at the same position; the aerofoil guide blocks 6 are arranged equidistantly from the channel inlet 2 to the channel outlet 3.
In a preferred example, in the fuel cell flow channel structure based on the airfoil flow guide, the flow guide blocks 6 are similar to airfoils in shape, as shown in fig. 2, the lower base edges of the flow guide blocks are straight lines parallel to the gas flow direction and have a length of 2mm, the upper base edges of the flow guide blocks are a combination of straight lines and tangent arcs, the included angle between the straight line part at the front ends of the upper base edges of the airfoil flow guide blocks 6 and the lower base edges is 30 degrees, the included angle between the tangent lines of the tangent arcs at the tail ends of the flow guide blocks and the lower base edges is 60 degrees, and the distance between adjacent airfoil flow guide blocks 6 in the same flow channel is 1.2 mm.
In a preferred embodiment, the fuel cell flow channel structure based on aerofoil flow guidance has a cathode flow channel width and height of 0.9mm, an upper channel width of 0.55mm and a lower channel width of 0.35 mm.
In a preferred embodiment, in the fuel cell flow channel structure based on the airfoil-shaped flow guide, the airfoil-shaped flow guide blocks 6 may be disposed in various types of flow channels, such as parallel straight flow channels, corrugated flow channels, serpentine flow channels, and interdigitated flow channels.
In a preferred embodiment, in the fuel cell flow channel structure based on the foil flow guide, the foil flow guide blocks 6 may be arranged in sequence or in a staggered sequence in a single flow channel, as shown in fig. 1 and fig. 3 (a). The flow field structure arranged in a staggered manner enables the branch structure of the flow channel to be more uniformly distributed in the whole flow field, and the uniformity of oxygen distribution in the whole catalytic layer is improved.
In a preferred embodiment, in the fuel cell flow channel structure based on the airfoil flow guide, the airfoil flow guide blocks 6 may be arranged at the same position in adjacent flow channels, or may be arranged in a staggered manner, as shown in fig. 1 and fig. 3 (b). The staggered flow field structure can also ensure that the branch structure of the flow channel is more uniformly distributed in the whole flow field, thereby being beneficial to improving the performance of the fuel cell.
In a preferred embodiment, in the fuel cell flow channel structure based on the airfoil flow guide, the airfoil flow guide blocks 6 may be arranged equidistantly, or may be arranged from a sparse to a dense arrangement from the inlet to the outlet 3, as shown in fig. 1 and 3 (c). Along with the gradual consumption of oxygen along the flow direction, the oxygen concentration of the section close to the outlet 3 is lower, tail disturbance and under-ridge mass transfer are increased in the arrangement mode from sparse to dense from the inlet to the outlet 3, the uniformity of the oxygen close to the tail end of each flow channel can be improved, and the performance of the whole fuel cell is further improved.
The advantages of the invention are explained in more detail below with reference to specific embodiments:
this example uses 3 fuel cells, where the cathode flow channels of one cell are conventional parallel straight flow channels that are not optimized, the cathode flow channels of the second cell are conventional serpentine flow channel designs, and the cathode flow channels of the third cell are optimized based on foil flow guidance, as shown. The three batteries have the same structure and material except the different cathode structure, and the length, width, height, groove-ridge ratio, etc. of the cathode flow channel are all kept consistent. Three batteries are in the same working condition: the operation temperature is 80 ℃, air with 100 percent of humidification is introduced into the cathode, hydrogen with 30 percent of humidification is introduced into the anode, the cathode stoichiometric ratio is 2.5, the anode stoichiometric ratio is 2, and the pressure of the outlet 3 of the cathode and the anode is 2.5 atmospheric pressures.
Fig. 4 shows a comparison between a polarization curve and an output power curve of a fuel cell designed based on a conventional parallel straight flow channel and a wing-shaped flow guide in a cathode flow channel, and it can be seen from the comparison that the performance of the proton exchange membrane fuel cell is remarkably improved by the cathode flow channel structure based on the wing-shaped flow guide, especially in a medium-high current density region.
Fig. 5 shows the average value of the oxygen concentration in the cathode catalyst layer of the fuel cell designed based on the conventional parallel straight flow channel and the wing-shaped diversion in the cathode flow channel, and it can be seen from the figure that, in the whole current density interval, under the same current density, the improvement of the oxygen concentration in the catalyst layer is very obvious by the cathode flow channel structure based on the wing-shaped diversion, and especially in the middle and high current density region, the improvement of the whole cell performance is facilitated.
Fig. 6 shows a cloud image of oxygen concentration distribution in the cathode catalyst layer of the fuel cell based on the conventional parallel straight flow channel and the wing-shaped flow guide design adopted in the cathode flow channel, and it can be seen from the image that the structural design of the wing-shaped flow guide makes the oxygen distribution in the whole catalyst layer more uniform, compared with the conventional parallel flow channel, the structural design of the wing-shaped flow guide improves the oxygen concentration near the tail end of each flow channel, so that the uniformity of the whole cell is better, and the cell performance is greatly improved.
Fig. 7 shows the pressure drop between the inlet and outlet 3 of the flow channels of 3 cells, and it can be seen that the pressure drop increase of the flow channel design based on the airfoil flow guidance is small compared to the conventional parallel flow channels, is substantially the same order of magnitude as that of the parallel flow channel design, and is much smaller than that of the serpentine flow channel. Under the same conditions, compared with the prior art, the flow channel design based on the wing-shaped flow guide can obviously improve the performance of the battery under the condition of basically not increasing additional pumping loss.
Finally, it should be noted that: the embodiments described are only a part of the embodiments of the present application, and not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (8)
1. A fuel cell flow channel structure based on wing-shaped flow guiding is characterized in that the structure comprises,
a flow field plate having a flow channel inlet and a flow channel outlet,
at least one fuel cell flow channel disposed between the flow channel inlet and the flow channel outlet, the fuel cell flow channel including an upper surface and a lower surface extending in a gas flow direction,
at least one wing-shaped deflector disposed in the fuel cell flow channel to divide the fuel cell flow channel into an upper flow channel and a lower flow channel at a predetermined included angle such that gas is divided as it flows through the wing-shaped deflector, the wing-shaped deflector comprising a first base surface parallel to the direction of gas flow and a second base surface opposite to the first base surface, the second base surface being a combination of a flat surface and a curved surface, the first base surface being a flat surface.
2. The fuel cell flow channel structure based on foil flow guidance of claim 1, wherein preferably the second bottom surface is a combination of a straight line and a tangent arc, the straight line forms an angle with the first bottom surface equal to the predetermined angle, and the tangent at the end of the tangent arc forms an angle with the first bottom surface greater than the predetermined angle.
3. The foil flow guide-based fuel cell flow channel structure of claim 2, wherein the predetermined angle is 30 ° and the tangent at the end of the tangent arc is at an angle of 45 ° to 75 ° to the first base surface.
4. The foil flow guide-based fuel cell flow channel structure of claim 2, wherein the first bottom surface has a length of 2 mm.
5. The fuel cell flow channel structure based on foil flow guidance of claim 1, wherein the width and height of the fuel cell flow channel are both 0.9mm, the width of the upper flow channel is 0.2-0.7mm, and the width of the lower flow channel is 0.7-0.2 mm.
6. The foil flow guide-based fuel cell flow channel structure of claim 1, wherein the first bottom surface is parallel to and adjacent to the lower surface and the second bottom surface is adjacent to the upper surface.
7. The foil flow guide-based fuel cell flow channel structure of claim 1 or 6, wherein the second bottom surface is the same shape as the corresponding portion of the upper surface.
8. The foil flow guide based fuel cell flow channel structure of claim 1, wherein the fuel cell flow channel comprises a parallel straight flow channel, a corrugated flow channel, a serpentine flow channel, or an interdigitated flow channel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000448A (en) * | 2022-05-24 | 2022-09-02 | 中国科学院大连化学物理研究所 | Flow field structure of drop-shaped fuel cell |
| CN115528267A (en) * | 2022-09-20 | 2022-12-27 | 中国科学院宁波材料技术与工程研究所 | Flow field plate, fuel cell monomer, fuel cell, power generation system and power utilization equipment |
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| CN212783526U (en) * | 2020-08-26 | 2021-03-23 | 常熟氢能源研究院有限公司 | Metal bipolar plate with micro-protrusion structure |
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| CN115000448A (en) * | 2022-05-24 | 2022-09-02 | 中国科学院大连化学物理研究所 | Flow field structure of drop-shaped fuel cell |
| CN115528267A (en) * | 2022-09-20 | 2022-12-27 | 中国科学院宁波材料技术与工程研究所 | Flow field plate, fuel cell monomer, fuel cell, power generation system and power utilization equipment |
| CN115528267B (en) * | 2022-09-20 | 2023-08-15 | 中国科学院宁波材料技术与工程研究所 | Flow field plate, fuel cell unit, fuel cell, power generation system and electric equipment |
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