CN113422085A - Fuel cell polar plate, bipolar plate and fuel cell stack - Google Patents
Fuel cell polar plate, bipolar plate and fuel cell stack Download PDFInfo
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- CN113422085A CN113422085A CN202110861391.6A CN202110861391A CN113422085A CN 113422085 A CN113422085 A CN 113422085A CN 202110861391 A CN202110861391 A CN 202110861391A CN 113422085 A CN113422085 A CN 113422085A
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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
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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
- H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
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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 invention relates to a fuel cell polar plate, a bipolar plate and a fuel cell stack, wherein one surface of the fuel cell polar plate is a gas flow passage surface, the other surface of the fuel cell polar plate is a cooling flow passage surface, a gas flow passage is arranged on the gas flow passage surface and positioned in an active area of a fuel cell, a phase-change fluid channel for circulating phase-change fluid is arranged on the cooling flow passage surface, the phase-change fluid channel completely covers the active area of the fuel cell, and the occupied area of the phase-change fluid channel is larger than that of the active area of the bipolar plate. The bipolar plate comprises two fuel cell polar plates, cooling flow channel surfaces of the two fuel cell polar plates are mutually attached, and the phase-change fluid channel forms a vacuum closed flow channel structure. Compared with the prior art, the heat dissipation of the bipolar plate is realized by utilizing the phase change latent heat of the phase change fluid, the temperature gradient of a corresponding reaction area on the bipolar plate can be reduced, the heat transfer temperature difference from the reaction area to the phase change fluid is reduced, the heat carrying capacity of the pile heat management system is improved, and the heat dissipation requirement of a high-power heat management cooling system is met.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell polar plate, a bipolar plate and a fuel cell stack.
Background
Proton Exchange Membrane Fuel Cells (PEMFC) have the advantages of high efficiency, low pollution and low noise, and have wide application prospects. Improving the power generation capability of the stack is an important objective for developing the fuel cell, but the increase of the power generation capability of the fuel cell will result in the increase of the heat generation amount of the fuel cell, so that a new technical means needs to be provided to meet the heat dissipation requirement of the stack on the premise of improving the power generation capability.
Bipolar plates are currently the key components that make up a fuel cell, and their main features include the following:
1) comprises two polar plates: a first polar plate and a second polar plate;
2) one side of the first polar plate is a cooling liquid runner surface containing a cooling liquid runner, and the other side of the first polar plate is an air runner surface containing an air runner; the areas of the cooling liquid flow channel surfaces on the two sides of the first polar plate are consistent with the areas of the air flow channel surfaces; one side of the second polar plate is a cooling liquid runner surface and comprises a cooling liquid runner, and the other side of the second polar plate is a hydrogen runner surface and comprises a hydrogen runner; the areas of the cooling liquid flow channel surfaces on the two sides of the second polar plate are consistent with the areas of the hydrogen flow channel surfaces; the cooling liquid flow passage, the air flow passage and the hydrogen flow passage are all provided with obvious inlets and outlets;
3) the cooling liquid flow passage surfaces of the first polar plate and the second polar plate are jointed together and then welded or bonded together to form a bipolar plate; the bipolar plate surface comprises: the hydrogen cooling system comprises an air inlet, an air outlet, a hydrogen inlet, a hydrogen outlet, a cooling liquid inlet and a cooling liquid outlet;
4) the cooling liquid flow channel surfaces of the first polar plate and the second polar plate are jointed together to form a cooling liquid flow channel of the bent bipolar plate, meanwhile, the cooling liquid flow channel of the bipolar plate is not closed and is provided with a cooling liquid inlet and a cooling liquid outlet, and external cooling liquid enters the cooling liquid flow channel inside the bipolar plate through the cooling liquid inlet and flows out of the cooling liquid flow channel inside the bipolar plate through the cooling liquid outlet;
4) the bipolar plate material: 316L stainless steel with a conductive corrosion-resistant coating on the surface; titanium alloy containing surface conductive corrosion-resistant plating; mixing epoxy resin and pressing to form graphite; when the first polar plate and the second polar plate are both made of metal, the first polar plate and the second polar plate are directly welded or bonded to form the bipolar plate; the first polar plate and the second polar plate are made of non-metal materials or non-metal materials and metal materials; the first polar plate and the second polar plate form a bipolar plate by means of bonding.
The existing fuel cell stack is based on the bipolar plate, and a membrane electrode, a sealing element, an end plate section (a first unipolar plate), a bottom plate section (a last unipolar plate), an end plate, a bottom plate, a first current collecting plate, a second current collecting plate, a first insulating plate, a second insulating plate, a sealing element, a fastening bolt, a hydrogen inlet interface, a hydrogen outlet interface, an air inlet interface, an air outlet interface, a cooling liquid inlet interface and a cooling liquid outlet interface are combined to form the stack.
The end plate (first section) unipolar plate is composed of two plates (a polar plate and an end plate), wherein one side of the polar plate is a hydrogen flow channel, the other side of the polar plate is a cooling liquid flow channel, one side of the end plate is a plane plate, and the other side of the end plate is a cooling liquid flow channel; in accordance with the manner of assembly of the bipolar plates, the two plates are welded or bonded together.
The bottom plate (the last section) is a unipolar plate and consists of two plates (a polar plate and a bottom plate), wherein one side of the polar plate is an air flow channel, the other side of the polar plate is a cooling liquid flow channel, one side of the bottom plate is a plane plate, and the other side of the bottom plate is a cooling liquid flow channel; in accordance with the manner of assembly of the bipolar plates, the two plates are welded or bonded together.
In part of the disclosed technical schemes:
the end plate section and the bottom plate section are only provided with one plate; for the end plate segment, one surface is a hydrogen flow channel surface, and the other surface is a cooling liquid flow channel surface; for the bottom plate section, one surface is an air flow channel, and the other surface is a cooling liquid flow channel;
the cooling liquid in the fuel cell stack is ethylene glycol aqueous solution, deionized water or ethylene glycol aqueous solution containing other components.
The prior art scheme is as follows: the cooling fluid of the cooling fluid flow channel in the bipolar plate flows in from the outside, and the ethylene glycol aqueous solution or the deionized water is used as the cooling fluid, and the modified ethylene glycol aqueous solution containing other components is used as the cooling fluid, but the sensible heat of the cooling fluid is used for carrying heat;
the defects of the prior art are as follows:
1. the cooling liquid flows in from the outside, if the cooling liquid is polluted by the external environment, the working medium is brought into the cooling channel which can block the bipolar plate, so that the single section of the fuel cell is failed, and finally the whole fuel cell is failed;
2. the thermal management requirement when the calorific value of the fuel cell is increased cannot be met: when the calorific value is increased, the temperature difference between the cooling liquid and the membrane electrode is increased, and in order to ensure the stability of the reaction temperature of the system, the temperature of the cooling liquid must be reduced, but the temperature exceeds the limit of the existing thermal management system;
3. on the fuel cell stack layer, the end plate is provided with a cooling liquid inlet interface and a cooling liquid outlet; increasing the system complexity of the fuel cell stack.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned shortcomings of the prior art and providing a fuel cell plate, a bipolar plate and a fuel cell stack.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a fuel cell polar plate, the polar plate one side be gas flow path face, the another side is cooling flow path face, gas flow path face on lie in fuel cell active area and be equipped with gas flow path, cooling flow path face on be equipped with the phase transition fluid passageway that is used for circulating phase transition fluid, phase transition fluid passageway cover fuel cell active area completely and the shared area of phase transition fluid passageway is greater than the active area of bipolar plate.
Preferably, the phase-change fluid channel comprises curved flow channels connected end to end.
Preferably, the curved flow path comprises a serpentine flow path.
Preferably, the area occupied by the phase-change fluid channels is greater than 20% to 50% of the active area of the bipolar plate.
Preferably, the polar plate is respectively provided with an oxidizing gas inlet, an oxidizing gas outlet, a fuel gas inlet and a fuel gas outlet.
A bipolar plate of a fuel cell comprises two fuel cell polar plates which are respectively a first polar plate and a second polar plate, wherein cooling flow passage surfaces of the first polar plate and the second polar plate are mutually attached, a phase-change fluid passage forms a vacuum closed flow passage structure, the vacuum closed flow passage structure is communicated with a phase-change fluid filling port for injecting phase-change fluid, a gas flow passage on the first polar plate is used for flowing oxidizing gas to form an oxidizing gas flow passage, a gas flow passage on the second polar plate is used for flowing fuel gas to form a fuel gas flow passage, the oxidizing gas flow passage is respectively communicated with an oxidizing gas inlet and an oxidizing gas outlet, and the fuel gas flow passage is communicated with a fuel gas inlet and a fuel gas outlet.
Preferably, the phase-change fluid filling port is arranged on the first polar plate or the second polar plate and communicated with the corresponding phase-change fluid channel on the polar plate.
Preferably, the phase-change fluid comprises any one of deionized water, ammonia and alcohol.
A fuel cell stack comprises a plurality of bipolar plates and a membrane electrode which are stacked in sequence, wherein the bipolar plates adopt the fuel cell bipolar plates.
A fuel cell stack comprises a plurality of bipolar plates and membrane electrodes which are stacked in sequence, the bipolar plates are adopted as the fuel cell bipolar plates, end plate sections and bottom plate sections at two ends of the fuel cell stack respectively comprise the fuel cell polar plates, the end plate sections and the bottom plate sections further respectively comprise cover plates, one surface of each cover plate is a plane, the other surface of each cover plate is a cooling flow channel surface matched with the corresponding fuel cell polar plate, phase-change fluid channels consistent with the phase-change fluid channels on the fuel cell polar plates are arranged on the cooling flow channel surfaces, the cooling flow channel surfaces of the fuel cell polar plates and the cover plates are mutually attached, the phase-change fluid channels form a vacuum closed flow channel structure, and the vacuum closed flow channel structure is communicated with a phase-change filling fluid port used for filling phase-change fluid.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, the phase-change fluid is encapsulated in the bipolar plate by arranging the phase-change fluid channel, and the heat dissipation of the bipolar plate is realized by utilizing the phase-change latent heat of the phase-change fluid, so that the temperature gradient of a corresponding reaction area on the bipolar plate can be reduced, the heat transfer temperature difference from the reaction area to the phase-change fluid is reduced, the heat carrying capacity of a pile heat management system is improved, and the heat dissipation requirement of a high-power heat management cooling system is met;
(2) the invention cancels the cooling liquid inlet and the cooling liquid outlet on the bipolar plate layer, and cancels the cooling liquid inlet interface and the cooling liquid outlet interface on the fuel cell stack layer, thereby the bipolar plate layer has no cooling liquid inlet and outlet bipolar plate, the stack layer has no cooling liquid inlet and outlet stack, and the design is simplified under the condition of effectively radiating.
Drawings
FIG. 1 is a schematic view of the gas flow path face of a fuel cell plate (first plate) according to the present invention;
FIG. 2 is a schematic view of the configuration of the gas flow path face of a fuel cell plate (second plate) of the present invention;
FIG. 3 is a schematic view of the structure of the cooling flow channel surface of the plate (first plate) of the fuel cell of the present invention;
FIG. 4 is a schematic view of the structure of the cooling flow channel face of the fuel cell plate (second plate) of the present invention;
FIG. 5 is a side view of a bipolar plate for a fuel cell of the present invention;
figure 6 is an exploded view of a fuel cell stack according to the present invention;
fig. 7 is a first exploded view of an end plate segment of a fuel cell stack according to example 4 of the present invention;
fig. 8 is a second exploded view of an end plate segment of a fuel cell stack according to example 4 of the present invention;
fig. 9 is a first exploded view of a bottom plate segment of a fuel cell stack according to example 4 of the present invention;
fig. 10 is a second exploded view of a bottom plate segment of a fuel cell stack according to example 4 of the present invention;
in the figure, 1 is a first polar plate, 2 is a second polar plate, 3 is an air inlet, 4 is an air outlet, 5 is a hydrogen inlet, 6 is a hydrogen outlet, 7 is a phase-change fluid channel, 8 is a phase-change fluid filling port, 9 is a bipolar plate, 10 is a membrane electrode, 11 is an end plate segment, 12 is a bottom plate segment, 13 is an end plate, 14 is a bottom plate, 15 is a first current collecting plate, 16 is a second current collecting plate, 17 is a first insulating plate, 18 is a second insulating plate, 19 is a fastening bolt, 20 is a hydrogen inlet interface, 21 is a hydrogen outlet interface, 22 is an air inlet interface, 23 is an air outlet interface, 1-1 is an air flow channel, 2-1 is a hydrogen flow channel, 1-2 is an air flow channel surface sealing element, 2-2 is a hydrogen flow channel surface sealing element, 11-1 is an end plate segment polar plate, 11-2 is an end plate segment cover plate, 12-1 is a bottom plate segment polar plate, 12-2 is a bottom plate section cover plate.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
Example 1
The present embodiment provides a fuel cell plate, one side of the plate is a gas flow channel surface, the other side is a cooling flow channel surface, a gas flow channel is disposed on the gas flow channel surface and located in an active region of the fuel cell, a phase-change fluid channel 7 for flowing a phase-change fluid is disposed on the cooling flow channel surface, the phase-change fluid channel 7 completely covers the active region of the fuel cell, and an area occupied by the phase-change fluid channel 7 is larger than an area occupied by an active region of a bipolar plate.
The phase-change fluid channel 7 comprises a curved flow channel connected end to end, the curved flow channel comprises a snake-shaped flow channel, and the phase-change fluid channel 7 is free of a fluid inlet and a fluid outlet. The area occupied by the phase change fluid channels 7 is 20-50% larger than the active area of the bipolar plate. The polar plate is respectively provided with an oxidizing gas inlet, an oxidizing gas outlet, a fuel gas inlet and a fuel gas outlet.
As shown in fig. 1, an oxidizing gas flow channel is formed when the gas flow channel of the fuel cell plate is used for flowing an oxidizing gas, and as shown in fig. 2, a fuel gas flow channel is formed when the gas flow channel of the fuel cell plate is used for flowing a fuel gas, in the present embodiment, the oxidizing gas is air and the fuel gas is hydrogen, and thus an air flow channel 1-1 and a hydrogen flow channel 2-1 are formed. An oxidizing gas inlet, an oxidizing gas outlet, a fuel gas inlet and a fuel gas outlet, namely an air inlet 3, an air outlet 4, a hydrogen inlet 5 and a hydrogen outlet 6 in the embodiment, are respectively arranged on each fuel cell polar plate.
As shown in fig. 3 and 4, the other surface of the fuel cell plate is provided with the above-described phase-change fluid passage 7, and a phase-change fluid filler port 8 is provided in one of the plates.
Example 2
As shown in fig. 5, the present embodiment provides a fuel cell bipolar plate, which includes two fuel cell polar plates, namely a first polar plate 1 and a second polar plate 2, cooling flow channel surfaces of the first polar plate 1 and the second polar plate 2 are attached to each other, a phase-change fluid channel 7 forms a vacuum closed flow channel structure, the vacuum closed flow channel structure is communicated with a phase-change fluid filling port 8 for injecting phase-change fluid, a gas flow channel on the first polar plate 1 is used for flowing oxidizing gas to form an oxidizing gas flow channel, a gas flow channel on the second polar plate 2 is used for flowing fuel gas to form a fuel gas flow channel, the oxidizing gas flow channel is respectively communicated with an oxidizing gas inlet and an oxidizing gas outlet, and the fuel gas flow channel is communicated with a fuel gas inlet and a fuel gas outlet. The phase-change fluid filling port 8 is arranged on the first polar plate 1 or the second polar plate 2 and communicated with the corresponding phase-change fluid channel 7 on the polar plate. The phase change fluid comprises any one of deionized water, ammonia and alcohol.
The structure of the first electrode plate 1 in this embodiment is shown in fig. 1 and fig. 2, and the structure of the second electrode plate 2 is shown in fig. 3 and fig. 4, and the specific structure is completely the same as that in embodiment 1, and is not described again in this embodiment. An air flow channel surface sealing piece 1-2 is arranged on the surface of an air flow channel 1-1 of the first polar plate 1, and a hydrogen flow channel surface sealing piece 2-2 is arranged on the surface of a hydrogen flow channel 2-1 of the second polar plate 2. The phase-change fluid channel 7 in the bipolar plate is vacuumized through the phase-change fluid filling port 8, then filled with phase-change fluid through the phase-change fluid filling port 8 and sealed; in the standard state, the volume of the liquid phase-change fluid accounts for 50-70% of the volume of the phase-change fluid channel 7. After the phase-change fluid channel 7 in the bipolar plate is filled with the phase-change fluid, the phase-change material is heated and then becomes gaseous from liquid, heat is transferred to the outside, and the heat dissipation of the bipolar plate of the fuel cell of the bipolar plate is realized, specifically, the liquid phase-change material is heated and then becomes gaseous, and the temperature of the place, which is positioned outside the active area of the bipolar plate, of the phase-change fluid channel 7 is lower, so that the gaseous phase-change material flows outwards, the heat dissipation is realized, after the temperature is reduced, the gaseous phase-change material is liquefied into liquid, and enters the active area of the bipolar plate in the phase-change fluid channel 7 again, and the self-circulation cooling is realized.
Example 3
The present embodiment provides a fuel cell stack, which includes a plurality of bipolar plates 9 and membrane electrodes 10 stacked in sequence, wherein the bipolar plates 9 are the bipolar plates of the fuel cell in embodiment 2. The fuel cell bipolar plate 9 at the head is provided with a first current collecting plate 15, a first insulating plate 17 and an end plate 13 in sequence, the fuel cell bipolar plate 9 at the tail is provided with a second current collecting plate 16, a second insulating plate 18 and a bottom plate 14 in sequence, the end plate 13, the first insulating plate 17, the first current collecting plate 15, a plurality of bipolar plates 9 and the second current collecting plate 16 in sequence, and the second insulating plate 18 and the bottom plate 14 are fixed through fastening bolts 19. The end plate 13 is provided with a hydrogen inlet port 20, a hydrogen outlet port 21, an air inlet port 22 and an air outlet port 23.
Example 4
Unlike embodiment 1, the first and last bipolar plates 9 of the fuel cell stack of this embodiment are arranged in an end plate segment 11 and a bottom plate segment 12 structure as shown in fig. 6, and the rest is the same as embodiment 1.
As shown in fig. 7 to 10, the end plate sections 11 and the bottom plate sections 12 at two ends of the fuel cell stack respectively include fuel cell polar plates, the end plate sections 11 and the bottom plate sections 12 further respectively include cover plates, one side of each cover plate is a plane, the other side of each cover plate is a cooling channel surface adapted to the fuel cell polar plate, the cooling channel surface is provided with a phase-change fluid channel 7 consistent with the phase-change fluid channel 7 on the fuel cell polar plate, the cooling channel surfaces of the fuel cell polar plate and the cover plate are attached to each other, the phase-change fluid channels 7 form a vacuum closed channel structure, and the vacuum closed channel structure is communicated with a phase-change fluid filling port 8 for filling phase-change fluid.
Specifically, as shown in fig. 7 and 8, the end plate segment 11 includes an end plate segment plate 11-1 and an end plate segment cover plate 11-2, the structure of the end plate segment plate 11-1 is identical to that of the second plate 2 in embodiment 2, and the gas flow channels on the end plate segment plate 11-1 are used for flowing fuel gas to form fuel gas flow channels, in this embodiment, the fuel gas is hydrogen, so that the hydrogen flow channels 2-1 are formed. One surface of the end plate segment cover plate 11-2 is a plane, the other surface is a cooling flow channel surface matched with the end plate segment polar plate 11-1, the phase change fluid channel 7 on the end plate segment cover plate is completely consistent with the phase change fluid channel 7 on the end plate segment polar plate 11-1, and meanwhile, the air inlet 3, the air outlet 4, the hydrogen inlet 5 and the hydrogen outlet 6 are correspondingly arranged on the end plate segment cover plate 11-2.
Similarly, as shown in fig. 9 and 10, the bottom plate segment 12 includes a bottom plate segment plate 12-1 and a bottom plate segment cover plate 12-2, the structure of the bottom plate segment plate 12-1 is completely the same as that of the first plate 1 in embodiment 2, and the gas channels on the bottom plate segment plate 12-1 are used for flowing oxidizing gas to form oxidizing gas channels, in this embodiment, the oxidizing gas is air, and thus the air channels 1-1 are formed. One surface of the bottom plate segment cover plate 12-2 is a plane, the other surface is a cooling flow channel surface matched with the bottom plate segment polar plate 12-1, the phase change fluid channel 7 on the bottom plate segment cover plate is completely consistent with the phase change fluid channel 7 on the bottom plate segment polar plate 12-1, and meanwhile, the bottom plate segment cover plate 12-2 is correspondingly provided with an air inlet 3, an air outlet 4, a hydrogen inlet 5 and a hydrogen outlet 6.
The fuel cell stack only has a hydrogen inlet interface 20, a hydrogen outlet interface 21, an air inlet interface 22 and an air outlet interface 23, and the total number of the four interfaces is four, so that a cooling liquid inlet and a cooling liquid outlet are not used. The phase change fluid channels 7 in the bipolar plate 9 carry heat inside the fuel cell away from the reaction zone by phase change of the internal fluid.
According to the invention, the phase-change fluid is encapsulated in the bipolar plate 9 through the phase-change fluid channel 7, and the heat dissipation of the bipolar plate 9 is realized by utilizing the phase-change latent heat of the phase-change fluid, so that the temperature gradient of a corresponding reaction area on the bipolar plate 9 can be reduced, the heat transfer temperature difference from the reaction area to the phase-change fluid is reduced, the heat carrying capacity of a pile heat management system is improved, and the heat dissipation requirement of a high-power heat pipe cooling system is met.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. The utility model provides a fuel cell polar plate, polar plate one side be gas flow path face, the another side is cooling flow path face, gas flow path face on lie in fuel cell active area and be equipped with gas flow path, its characterized in that, cooling flow path face on be equipped with phase change fluid channel (7) that are used for circulating phase change fluid, phase change fluid channel (7) cover fuel cell active area completely and phase change fluid channel (7) shared area is greater than the active area of bipolar plate.
2. A fuel cell plate according to claim 1, wherein said phase change fluid channels (7) comprise serpentine flow paths connected end to end.
3. A fuel cell plate as claimed in claim 2, wherein said serpentine flow path comprises a serpentine flow path.
4. A fuel cell plate according to claim 1, wherein the area occupied by the phase change fluid channels (7) is greater than 20% to 50% of the active area of the bipolar plate.
5. The fuel cell plate of claim 1, wherein the plate is provided with an oxidant gas inlet, an oxidant gas outlet, a fuel gas inlet, and a fuel gas outlet, respectively.
6. A fuel cell bipolar plate, comprising two fuel cell plates according to any one of claims 1 to 5, a first plate (1) and a second plate (2), the cooling flow passage surfaces of the first polar plate (1) and the second polar plate (2) are mutually jointed, the phase-change fluid channel (7) forms a vacuum closed flow channel structure which is communicated with a phase-change fluid filling port (8) for filling phase-change fluid, the gas channel on the first polar plate (1) is used for flowing oxidizing gas to form an oxidizing gas channel, the gas flow channel on the second polar plate (2) is used for flowing fuel gas to form a fuel gas flow channel, the oxidizing gas flow channel is respectively communicated with the oxidizing gas inlet and the oxidizing gas outlet, and the fuel gas flow channel is communicated with the fuel gas inlet and the fuel gas outlet.
7. A fuel cell bipolar plate according to claim 6, wherein said phase change fluid fill port (8) is provided in the first plate (1) or the second plate (2) and communicates with a corresponding phase change fluid channel (7) in the plate.
8. A fuel cell bipolar plate as in claim 6, wherein said phase change fluid comprises any one of deionized water, ammonia, and alcohol.
9. A fuel cell stack, comprising a plurality of bipolar plates (9) and a membrane electrode (10) stacked in sequence, wherein the bipolar plates (9) adopt the fuel cell bipolar plates according to any one of claims 6 to 8.
10. A fuel cell stack comprises a plurality of bipolar plates (9) and membrane electrodes (10) which are stacked in sequence, and is characterized in that the bipolar plates (9) adopt the fuel cell bipolar plates according to any one of claims 6 to 8, end plate sections (11) and bottom plate sections (12) at two ends of the fuel cell stack respectively comprise the fuel cell polar plates according to any one of claims 1 to 5, the end plate sections (11) and the bottom plate sections (12) respectively comprise cover plates, one surface of each cover plate is a plane, the other surface of each cover plate is a cooling flow channel surface matched with the fuel cell polar plates, the cooling flow channel surfaces are provided with phase-change fluid channels (7) consistent with the phase-change fluid channels (7) on the fuel cell polar plates, the cooling flow channel surfaces of the fuel cell polar plates and the cover plates are mutually attached, and the phase-change fluid channels (7) form a vacuum closed flow channel structure, the vacuum closed flow channel structure is communicated with a phase-change fluid filling port (8) for filling phase-change fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110861391.6A CN113422085A (en) | 2021-07-29 | 2021-07-29 | Fuel cell polar plate, bipolar plate and fuel cell stack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110861391.6A CN113422085A (en) | 2021-07-29 | 2021-07-29 | Fuel cell polar plate, bipolar plate and fuel cell stack |
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| Publication Number | Publication Date |
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| CN113422085A true CN113422085A (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110861391.6A Pending CN113422085A (en) | 2021-07-29 | 2021-07-29 | Fuel cell polar plate, bipolar plate and fuel cell stack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464839A (en) * | 2022-02-11 | 2022-05-10 | 山东大学 | Novel fuel cell stack with multistage self-preheating inlet air and control method |
-
2021
- 2021-07-29 CN CN202110861391.6A patent/CN113422085A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464839A (en) * | 2022-02-11 | 2022-05-10 | 山东大学 | Novel fuel cell stack with multistage self-preheating inlet air and control method |
| CN114464839B (en) * | 2022-02-11 | 2024-03-29 | 山东大学 | Novel fuel cell stack with multi-stage self-preheating air inlet and control method |
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