CN217933868U - Streamline transition area structure and polar plate - Google Patents
Streamline transition area structure and polar plate Download PDFInfo
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- CN217933868U CN217933868U CN202221565227.7U CN202221565227U CN217933868U CN 217933868 U CN217933868 U CN 217933868U CN 202221565227 U CN202221565227 U CN 202221565227U CN 217933868 U CN217933868 U CN 217933868U
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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
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Abstract
The application provides a streamline transition zone structure which is suitable for a polar plate of a fuel cell and comprises a first streamline part, a second streamline part and a third streamline part, wherein the second streamline part is arranged between the first streamline part and the third streamline part, and the first streamline part and the second streamline part are arranged close to an inlet/outlet of the polar plate; the first flow line part comprises a plurality of independently arranged first ridges, and the first ridges are arranged in a bent manner towards the second flow line part; the second streamline part comprises a plurality of groups of second ridges which are independently arranged, and the plurality of groups of second ridges are arranged in a linear shape; the third streamline portion comprises a plurality of independently arranged third ridges, and the third ridges are arranged in a bent manner towards the second streamline portion; a flow area of the third flow line portion is larger than a flow area of the second flow line portion, and a flow area of the second flow line portion is larger than a flow area of the first flow line portion. The application also provides a polar plate. The structure of the application has the advantages of uniform fluid distribution and small pressure drop.
Description
Technical Field
The utility model relates to a fuel cell technical field especially relates to a streamlined transition district structure and polar plate.
Background
The hydrogen fuel cell can directly convert chemical energy in hydrogen and oxygen into electric energy, is not limited by Carnot cycle, has high conversion rate, and is a high-efficiency energy conversion device; meanwhile, the product of the hydrogen fuel cell only contains water, is clean and pollution-free, has zero carbon emission, and is an ideal new energy carrier.
The monocells (cells) are stacked in series to form a stack, and each cell consists of a membrane electrode and a bipolar plate. At present, two main types of electrode plates of a hydrogen fuel cell are a graphite plate and a metal plate, and a groove region, i.e., a flow channel, is generally processed on the surface of the electrode plate by a die pressing/stamping technology. The flow inside the cell, including the flow of hydrogen, air and water, is confined within the grooves, thereby forming the cell's internal flow field. The distribution of flow has a very large impact on the performance of the battery. At present, in the design of a polar plate of a fuel cell, a transition region is often arranged to play a role in flow distribution, but the transition region can play a role in flow distribution and cause a problem of excessive pressure drop of the polar plate.
The polar plate of the proton exchange membrane fuel cell is developing towards the direction of size refinement and structure three-dimension. The electrode plate flow channel of the existing fuel cell is unreasonable in design, and the problems of uneven flow distribution, increased pressure loss of the electrode plate, reduced diffusion mass transfer capacity of reactants, reduced utilization rate of the reactants and the like are easily caused, so that the performance of the fuel cell is reduced.
SUMMERY OF THE UTILITY MODEL
Based on this, for the polar plate runner design that solves current fuel cell is unreasonable, leads to the pressure loss of flow distribution inhomogeneous easily, polar plate to rise, the diffusion mass transfer ability decline of reactant, the utilization ratio decline scheduling problem of reactant, and then makes fuel cell's performance decline scheduling problem, the utility model provides a streamlined transition district structure and polar plate. The streamlined transition region structure of this application can effectively control the distribution of flow, can also effectively reduce the pressure drop when making flow evenly distributed.
To achieve the above object, in one aspect, the present invention provides a streamlined transition region structure suitable for a polar plate of a fuel cell, including a first flow line part, a second flow line part and a third flow line part, wherein the second flow line part is disposed between the first flow line part and the third flow line part, and the first flow line part and the second flow line part are disposed near an inlet/outlet of the polar plate;
the first flow line portion comprises a plurality of independently disposed first ridges, and the plurality of first ridges are curvedly disposed toward the second flow line portion; the second streamline part comprises a plurality of groups of second ridges which are independently arranged, and the plurality of groups of second ridges are arranged in a linear shape; the third streamline portion comprises a plurality of independently arranged third ridges, and the third ridges are arranged in a bent manner towards the second streamline portion;
a flow area of the third flow line portion is larger than a flow area of the second flow line portion, and a flow area of the second flow line portion is larger than a flow area of the first flow line portion.
In a preferred embodiment, the first flow line part is respectively communicated with the flow channel of the polar plate and the inlet/outlet of the polar plate; the second flow line part is respectively communicated with the flow channel of the polar plate and the inlet/outlet of the polar plate; and the third flow line part is respectively communicated with the flow channel of the polar plate and the inlet/outlet of the polar plate.
In a preferred embodiment, the end parts of the first ridges, which are close to the flow channels of the polar plates, are on the same horizontal line; and a first transition channel is formed between every two adjacent first ridges and is communicated with the flow channel of the polar plate.
In a preferred embodiment, each set of the second ridges includes a second partial ridge and a second branch ridge that are independently provided, the second partial ridge is provided near the first flow line portion, and the length of the second partial ridge is shorter than the length of the second branch ridge.
In a preferred embodiment, the end of the first ridge close to the flow channel of the plate and the end of the second ridge close to the flow channel of the plate are on the same horizontal line; the second branch ridge and the second branch ridge are respectively arranged in an inclined way with the flow channel of the polar plate.
In a preferred embodiment, the second sub-ridge and the second sub-ridge are disposed in an inclined manner, and an end portion of the second sub-ridge close to the flow channel of the polar plate are on the same horizontal line.
In a preferred embodiment, a second transition channel is formed between the adjacent second sub-ridges and the second branch ridge, and the second transition channel is communicated with the flow channel of the plate.
In a preferred embodiment, the third ridge farthest from the second flow line part is a third ridge, and the lengths of a plurality of the third ridges increase from the third ridge one by one; and a third transition channel is formed between every two adjacent third ridges and is communicated with the flow channel of the polar plate.
In a preferred embodiment, the width of the third transition channel is greater than the width of the second transition channel, and the width of the second transition channel is greater than the width of the first transition channel.
In a preferred embodiment, the flow rate of the first transition duct, the flow rate of the second transition duct, and the flow rate of the third transition duct are the same.
As a preferred embodiment, the inlet of the polar plate and the outlet of the polar plate are both provided with the streamline transition zone structure.
On the other hand, the embodiment of the utility model provides a still provide a polar plate, be applicable to fuel cell, be provided with on the polar plate streamlined transition district structure.
The embodiment of the utility model provides a streamlined transition district structure, through first spine towards the crooked setting of second flow line portion, second spine is the line type setting, the crooked setting of third spine towards second flow line portion for the flow of fluid in the transition district structure is roughly the same with fluidic flow under the true condition, guarantees that all regional flows are cut apart into the basic equality in the transition district, and then when guaranteeing fluid distribution's even, effectively reduces the pressure drop in the polar plate. Through the streamlined transition district structure of this application, fluid flow distributes evenly, and the pressure drop of polar plate is 16kpa, 40kpa pressure drop of current structure relatively, and the polar plate pressure drop of this application is reduced greatly, and the diffusion mass transfer ability and the utilization ratio of reactant are effectively improved simultaneously for fuel cell has better performance. The structure cost of this application is lower, economical and practical, and simple to operate can be applicable to the large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a streamline transition region structure according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a polar plate applying the streamline transition zone structure of fig. 1 of the present invention.
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top, bottom, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion condition, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
It will be understood that when an element is referred to as being "secured to" 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 relating to "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 relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
At present, in the existing fuel cell plate structure, an inlet is arranged above and an outlet is arranged below, flow channels of a transition region are arranged in parallel in the horizontal direction, and fluid enters from the inlet, then is distributed by the transition region, and enters a downstream flow channel. The flow velocity of the fluid towards two sides in the flow channel is increased, and the flow of the fluid is hindered due to the parallel arrangement of the flow channels in the transition region in the horizontal direction, so that the problems of uneven distribution of the fluid, increased pressure loss of a polar plate, reduced diffusion mass transfer capacity of reactants, reduced utilization rate of the reactants and the like are solved, and the performance of the fuel cell is reduced. Accordingly, embodiments of the present application provide a streamlined transition region structure and a polar plate to solve the above technical problems.
In one aspect, as shown in fig. 1 to 2, the present invention provides a streamlined transition region structure suitable for a polar plate 100 of a fuel cell, including a first flow line part 10, a second flow line part 20 and a third flow line part 30, wherein the second flow line part 20 is disposed between the first flow line part 10 and the third flow line part 30, and the first flow line part 10 and the second flow line part 20 are disposed near an inlet/outlet of the polar plate 100;
the first flow line part 10 includes a plurality of independently arranged first ridges 11, and the plurality of first ridges 11 are curvedly arranged toward the second flow line part 20; the second streamline portion 20 comprises a plurality of groups of second ridges 21 which are independently arranged, and the plurality of groups of second ridges 21 are arranged in a linear shape; the third flow line part 30 includes a plurality of independently provided third ridges 31, and the plurality of third ridges 31 are curved toward the second flow line part 20;
the third flow line part 30 has a larger flow area than the second flow line part 20, and the second flow line part 20 has a larger flow area than the first flow line part 10. The arrangement can effectively ensure the uniformity of flow distribution and reduce pressure drop.
In the embodiment of the application, the bending direction and the bending degree of the first ridge 11 are consistent with the flow angle and the direction of the fluid in the polar plate, so that the uniformity of flow distribution can be effectively ensured, and the pressure drop is reduced; the bending direction and the bending degree of the third ridge 31 are consistent with the flowing angle and the flowing direction of the fluid in the polar plate, so that the uniformity of flow distribution can be further effectively ensured, and the pressure drop is reduced. In the embodiment of the application, the first ridge, the second ridge and the third ridge are all integrally formed with the polar plate.
In a preferred embodiment, the first flow line part 10 is respectively communicated with the flow channel 101 of the electrode plate 100 and the inlet 102/outlet 103 of the electrode plate 100; the second flow line part 20 is respectively communicated with a flow channel 101 of the polar plate 100 and an inlet 102/outlet 103 of the polar plate 100; the third flow line part 30 is respectively communicated with the flow channel 101 of the polar plate 100 and the inlet 102/outlet 103 of the polar plate 100.
In a preferred embodiment, the ends of each first ridge 11, which are close to the flow channels 101 of the plate 100, are on the same horizontal line; a first transition channel 12 is formed between two adjacent first ridges 11, and the first transition channel 12 is communicated with the flow channel 101 of the polar plate 100. Therefore, the flow distribution can be effectively ensured to be uniform, and the pressure drop is reduced.
In a preferred embodiment, each set of the second ridges 21 includes a second branch ridge 211 and a second branch ridge 212, which are independently disposed, the second branch ridge 211 is disposed near the first flow line portion 10, and the length of the second branch ridge 211 is shorter than the length of the second branch ridge 212. By the arrangement, the distance between the second branch ridge 211 and the second branch ridge 212 can be ensured, the uniformity of flow distribution is effectively ensured, the pressure drop is reduced, and meanwhile, the processing of the second branch ridge 211 and the second branch ridge 212 is facilitated.
In a preferred embodiment, the end of the first ridge 11 close to the flow channel 101 of the plate 100 and the end of the second ridge 21 close to the flow channel 101 of the plate 100 are on the same horizontal line; the second branch ridge 211 and the second branch ridge 212 are respectively inclined with the flow channel 101 of the plate 100. Therefore, the flow angle and the flow direction of the fluid in the second transition passage and the polar plate are consistent, so that the uniformity of flow distribution can be effectively ensured, and the pressure drop is reduced. If the end of the first ridge 11 close to the flow channel 101 of the plate 100 and the end of the second ridge 21 close to the flow channel 101 of the plate 100 are not on the same horizontal line (for example, the height is different), the flow distribution of the fluid in the plate will be uneven, and the pressure drop will be large.
In a preferred embodiment, the second branch ridge 211 and the second branch ridge 212 are disposed in an inclined manner, and an end of the second branch ridge 211 close to the flow channel 101 of the plate 100 and an end of the second branch ridge 212 close to the flow channel 101 of the plate 100 are on the same horizontal line. Therefore, the flow distribution can be effectively ensured to be uniform, and the pressure drop is reduced.
In a preferred embodiment, a second transition channel 22 is formed between the adjacent second branch ridges 211 and 212, and the second transition channel 22 is communicated with the flow channel 101 of the plate 100.
In a preferred embodiment, the third ridge 31 farthest from the second flow line part 20 is a third ridge a, and the lengths of the third ridges 31 increase from the third ridge a one by one; a third transition channel 32 is formed between two adjacent third ridges 31, and the third transition channel 32 is communicated with the flow channel 101 of the plate 100. Therefore, the flow angle and the flow direction of the fluid in the third transition passage and the polar plate are consistent, so that the uniformity of flow distribution can be effectively ensured, and the pressure drop is reduced.
In a preferred embodiment, the width of the third transition passage 32 is greater than the width of the second transition passage 22, and the width of the second transition passage 22 is greater than the width of the first transition passage 12. Therefore, the flow distribution can be effectively ensured to be uniform, and the pressure drop is reduced.
In a preferred embodiment, the flow rate of the first transition passage 12, the flow rate of the second transition passage 22, and the flow rate of the third transition passage 32 are the same.
As a preferred embodiment, the inlet 102 of the plate 100 and the outlet 103 of the plate 100 are both provided with the streamlined transition region structure.
On the other hand, the embodiment of the utility model provides a still provide a polar plate 100, be applicable to fuel cell, be provided with on the polar plate 100 streamlined transition district structure.
In the embodiment of the present application, the inlet 102 of the plate 100 and the outlet 103 of the plate 100 are both provided with the streamline transition region structure, so that distribution of plate fluid can be better ensured, and the fuel cell has better service performance.
The embodiment of the utility model provides a streamlined transition district structure, through first spine towards the crooked setting of second flow line portion, second spine is the line type setting, the crooked setting of third spine towards second flow line portion for the flow of fluid in the transition district structure is roughly the same with fluidic flow under the true condition, guarantees that all regional flows are cut apart into the basic equality in the transition district, and then when guaranteeing fluid distribution's even, effectively reduces the pressure drop in the polar plate. Through the streamlined transition district structure of this application, fluid flow distributes evenly, and the pressure drop of polar plate is at 16kpa, 40kpa pressure drop of current structure relatively, and the polar plate pressure drop of this application is reduced greatly, and the diffusion mass transfer ability and the utilization ratio of reactant are effectively improved simultaneously for fuel cell has better performance. The structure cost of this application is lower, economical and practical, and simple to operate can be applicable to the large-scale production.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.
Claims (10)
1. A streamlined transition zone structure, suitable for a plate of a fuel cell, comprising a first flow line portion, a second flow line portion and a third flow line portion, the second flow line portion being disposed between the first flow line portion and the third flow line portion, the first flow line portion and the second flow line portion being disposed proximate to an inlet/outlet of the plate;
the first flow line portion comprises a plurality of independently disposed first ridges, and the plurality of first ridges are curvedly disposed toward the second flow line portion; the second streamline part comprises a plurality of groups of second ridges which are independently arranged, and the plurality of groups of second ridges are arranged in a linear shape; the third streamline portion comprises a plurality of independently arranged third ridges, and the third ridges are arranged in a bent manner towards the second streamline portion;
a flow area of the third flow line portion is larger than a flow area of the second flow line portion, and a flow area of the second flow line portion is larger than a flow area of the first flow line portion.
2. The streamlined transition zone structure of claim 1, wherein the first flow line portion is in communication with a flow channel of the plate, an inlet/outlet of the plate, respectively; the second flow line part is respectively communicated with the flow channel of the polar plate and the inlet/outlet of the polar plate; and the third flow line part is respectively communicated with the flow channel of the polar plate and the inlet/outlet of the polar plate.
3. The streamlined transition zone structure of claim 1, wherein the end of each first ridge near the flow channel of the plate is on the same horizontal line; and a first transition channel is formed between every two adjacent first ridges and is communicated with the flow channel of the polar plate.
4. The faired transition structure of claim 3, wherein each set of said second ridges comprises a second portion ridge and a second branch ridge independently disposed, said second portion ridge being disposed proximate said first flow line portion, and said second portion ridge having a length shorter than a length of said second branch ridge.
5. The streamlined transition zone structure of claim 4, wherein the end of the first ridge near the flow channel of the plate and the end of the second ridge near the flow channel of the plate are on the same horizontal line; the second branch ridge and the second branch ridge are respectively arranged in an inclined way with the flow channel of the polar plate.
6. The streamlined transition region structure of claim 5, wherein the second sub-ridge and the second sub-ridge are disposed in an inclined manner, and an end portion of the second sub-ridge close to the flow channel of the polar plate are on the same horizontal line.
7. The streamlined transition region structure of claim 4, wherein a second transition channel is formed between the adjacent second partial ridge and the second branch ridge, and the second transition channel is communicated with the flow channel of the plate.
8. The streamlined transition region structure of claim 7, wherein the third ridge farthest from the second flow line portion is a third ridge, and the length of the plurality of third ridges increases from the third ridge one by one; and a third transition channel is formed between every two adjacent third ridges and is communicated with the flow channel of the polar plate.
9. The streamlined transition zone structure of claim 8, wherein the width of said third transition passage is greater than the width of said second transition passage, which is greater than the width of said first transition passage;
the flow rate of the first transition passage, the flow rate of the second transition passage and the flow rate of the third transition passage are the same.
10. A plate adapted for use in a fuel cell, said plate having a streamlined transition zone structure according to any one of claims 1 to 9 disposed thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221565227.7U CN217933868U (en) | 2022-06-20 | 2022-06-20 | Streamline transition area structure and polar plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221565227.7U CN217933868U (en) | 2022-06-20 | 2022-06-20 | Streamline transition area structure and polar plate |
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| Publication Number | Publication Date |
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| CN217933868U true CN217933868U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221565227.7U Active CN217933868U (en) | 2022-06-20 | 2022-06-20 | Streamline transition area structure and polar plate |
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- 2022-06-20 CN CN202221565227.7U patent/CN217933868U/en active Active
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