CN216624345U - Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel - Google Patents
Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel Download PDFInfo
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- CN216624345U CN216624345U CN202122659031.6U CN202122659031U CN216624345U CN 216624345 U CN216624345 U CN 216624345U CN 202122659031 U CN202122659031 U CN 202122659031U CN 216624345 U CN216624345 U CN 216624345U
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- 239000012528 membrane Substances 0.000 title claims abstract description 33
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 239000012495 reaction gas Substances 0.000 claims abstract description 48
- 238000004804 winding Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 9
- 238000003487 electrochemical reaction Methods 0.000 description 7
- 239000000376 reactant Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000013021 overheating Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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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 utility model provides a proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channels, which comprises a bipolar plate body, wherein a plurality of parallel flow field channels are arranged on the bipolar plate body along the flowing direction of reaction gas, each flow field channel consists of a plurality of sections of A sections and B sections which are continuously distributed at intervals and are mutually communicated, the cross-sectional area of the A section is continuously reduced along the flowing direction of the reaction gas, the cross-sectional area of the B section is continuously increased along the flowing direction of the reaction gas, the sections of the A section and the B section are the same, the positions of the A section and the B section between two adjacent flow field channels are mutually corresponding, and the cross-sectional shapes of the A section and the B section at the connecting part are the same. The section change of the sections A and B can be the change of the groove width or the change of the groove depth. When the reaction gas flows through, a pressure difference is formed between the section A and the section B of the adjacent channels, the reaction gas can flow across the channels, the reaction efficiency of the membrane electrode can be effectively increased, meanwhile, the generated water which is difficult to drain in the ridge area of the flow field can be taken away, and the flooding risk of the battery is reduced.
Description
Technical Field
The utility model belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a bipolar plate of a proton exchange membrane fuel cell with a variable cross-section flow field channel.
Background
The proton exchange membrane fuel cell is a device for generating electricity through the electrochemical reaction of hydrogen and oxygen, the reaction product is water, and the proton exchange membrane fuel cell is clean energy with wide application prospect and huge potential. The core of the proton exchange membrane fuel cell is an MEA component and a bipolar plate, wherein the MEA component is formed by placing two carbon fiber paper electrodes sprayed with Nafion solution and Pt catalyst on two sides of a pretreated proton exchange membrane, enabling the catalyst to be close to the proton exchange membrane, and pressing the carbon fiber paper electrodes at a certain temperature and pressure. In the working engineering of the fuel cell, an anode reactant enters a flow field activation reaction area through a flow field runner air inlet, then reaches a catalyst layer through a diffusion layer, is changed into ions after catalysis, passes through a proton exchange membrane, and reacts with the cathode reactant in a cathode flow field activation reaction area to form current. The bipolar plate is an important component in the proton exchange membrane fuel cell which plays roles of supporting and fixing the membrane electrode assembly, separating fuel gas (hydrogen) and oxidizing gas (oxygen or air), enabling reaction gas to be uniformly distributed on two sides of the proton exchange membrane, efficiently reacting, collecting conduction current and the like, and the design of the bipolar plate and the flow field of the fuel cell directly influences the fluid distribution and water management of anode and cathode reactants of the fuel cell, thereby influencing the efficiency of the fuel cell. The most common flow field channel forms of the existing bipolar plate design comprise a parallel channel flow field, a multi-channel serpentine flow field and an interdigital flow field, wherein the parallel flow field and the serpentine flow field are difficult to permeate into a region corresponding to a ridge between flow field channels due to the structural form of the flow field and cause that the gas concentration in a diffusion layer in the region is small and the electrochemical reaction efficiency on a membrane is low, so that the reaction on the membrane is uneven, meanwhile, accumulated water under the ridge of the flow field channel is difficult to discharge, flooding and channel blockage are easy to cause, the reaction efficiency is influenced, and the service life of equipment is reduced; the interdigital flow field is a flow field with discontinuous flow channels, the discontinuous flow channels can force fluid to enter the diffusion layer by forced convection, and the liquid water in gaps of the diffusion layer is driven to flow and be discharged, so that the existing problems are solved to a certain extent, but the interdigital flow field can increase the pressure drop of an inlet and an outlet, because the discontinuous flow channel structure has larger resistance, the reaction fluid with higher flow velocity can easily cause larger impact on the diffusion layer, so that local overheating is caused, the diffusion layer is damaged, meanwhile, the energy consumption can be increased due to the overlarge pressure drop, and the working efficiency of the battery is reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a proton exchange membrane fuel cell bipolar plate with continuously changed flow field channel sections. In order to achieve the technical purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a proton exchange membrane fuel cell bipolar plate with cross section variable flow field passageway, including the bipolar plate body, be provided with many parallel distribution's flow field passageway on the bipolar plate body along reactant gas flow direction, each flow field passageway comprises the A section and the B section that multistage continuous interval distribution and intercommunication each other, the cross sectional area of A section diminishes in succession along reactant gas flow direction, the cross sectional area of B section enlarges in succession along reactant gas flow direction, the length of A section and B section is the same, the position of A section and B section is corresponding between two adjacent flow field passageways, the junction portion cross sectional shape of A section and B section is the same.
Preferably, the groove width of the section a becomes continuously smaller in the reaction gas flowing direction, and the groove width of the section B becomes continuously larger in the reaction gas flowing direction.
Furthermore, the groove width of the flow field channel changes in a zigzag manner.
Further, the groove width of the flow field channel changes in a serpentine curve.
Preferably, the groove depth of the section a becomes continuously smaller in the reaction gas flow direction, and the groove depth of the section B becomes continuously larger in the reaction gas flow direction.
Preferably, the groove width and the groove depth of the section a are continuously reduced along the flowing direction of the reaction gas, and the groove width and the groove depth of the section B are continuously increased along the flowing direction of the reaction gas.
The utility model discloses a bipolar plate that provides is applicable to graphite bipolar plate, metal bipolar plate, composite bipolar plate etc. and the single strip flow field channel structure is periodic variation, and the A section and the B section of double-phase adjacent passageway are crisscross, correspond the distribution, when reaction gas flows through the interior A section of flow field passageway, because cross sectional area diminishes in succession, reaction gas is sustained compression, reaction gas pressure grow, and adjacent passageway corresponds to the B section, the continuous grow of cross sectional area, the reaction gas inflation, pressure diminishes. Therefore, pressure difference is formed between corresponding sections of adjacent channels, one part of reaction gas flows along the channels, the other part of reaction gas enters the section B of the adjacent region from the section A through the gas diffusion layer region, generated water which is difficult to remove under the ridge of the flow field can be taken away in the process, and the reaction gas is sent to the ridge of the flow field which is difficult to reach to carry out electrochemical reaction on the CCM membrane electrode region, so that the CCM membrane electrode in the region is effectively utilized, and the reaction on the membrane is more uniform.
Compared with the prior art, the utility model has the beneficial effects that:
1. through the structural design of the variable cross-section channels, pressure difference is formed between the adjacent channels, so that reaction gas can flow across the channels, the concentration of the reaction gas in the membrane electrode area corresponding to the ridge part of the flow field is increased, the utilization area on the membrane is increased, and the electrochemical reaction is more uniform and stable; meanwhile, the water which is difficult to drain in the area under the ridge of the flow field is taken away, a water management system is improved, the risk of flooding of the battery is reduced, the failure rate is reduced, and the service life of the equipment is prolonged.
2. Compared with a parallel flow field and a snake-shaped flow field structure, the structure can provide enough pressure drop to quickly discharge water generated by the fuel cell, has smaller pressure drop compared with an interdigital flow field while providing enough pressure drop, can reduce the auxiliary consumption of a fuel cell system, and improves the output power.
Drawings
FIG. 1: the utility model has the overall structure schematic diagram.
FIG. 2: the utility model is a schematic transverse cross-section.
FIG. 3: the utility model discloses a schematic diagram of a local three-dimensional structure of a flow field channel.
FIG. 4: the utility model discloses a longitudinal section schematic diagram of a flow field channel with groove depth change.
FIG. 5: the utility model discloses a flow field structure schematic diagram with groove width changing in a broken line type.
FIG. 6: the utility model discloses a flow field structure schematic diagram with a groove width changing in a serpentine curve type.
In each figure: 1.a bipolar plate body; 2. a flow field channel; section A; section B; 3. a flow field ridge; CCM membrane electrode; 5. a gas diffusion layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channels is disclosed, as shown in figure 1, the bipolar plate comprises a bipolar plate body 1, a plurality of flow field channels 2 distributed in parallel are arranged on the bipolar plate body 1 along the flowing direction of reaction gas, each flow field channel 2 is composed of a plurality of sections of A sections 21 and B sections 22 which are distributed continuously at intervals and communicated with each other, the cross-sectional area of the A section 21 is continuously reduced along the flowing direction of the reaction gas, the cross-sectional area of the B section 22 is continuously increased along the flowing direction of the reaction gas, the lengths of the A section 21 and the B section 22 are the same, the positions of the A section 21 and the B section 22 between two adjacent flow field channels 2 are mutually corresponding, and the cross-sectional shapes of the A section 21 and the B section 22 at the connecting part are the same. The bipolar plate body 1 is used for supporting and fixing the membrane electrode assembly, separating reaction gas and cooling water, providing a channel for the reaction gas, collecting conduction current and providing a channel for discharging water generated by electrochemical reaction; the flow field channels 2 provide flow channels for the reactant gases and the water generated by the electrochemical reaction. In a specific application, the plurality of flow field channels 2 have the same structure, the single-channel structure is periodically changed, the sections a 21 and B of two adjacent flow field channels 2 are staggered and correspondingly distributed, and as shown in fig. 2 and 3, when a reaction gas enters the section a 21 of the flow field in the polar plate, the reaction gas is continuously compressed due to the continuous reduction of the cross-sectional area, so that the gas pressure is increased; and the adjacent channel is corresponding to the section B22, the cross section area is continuously increased, the reaction gas expands, and the pressure is reduced. Therefore, a pressure difference is formed between corresponding sections of adjacent channels, one part of the reaction gas flows along the channels, the other part of the reaction gas passes through the gas diffusion layer 5 area and enters the adjacent channel B section 22 from the A section 21, and the reaction gas is sent to the CCM membrane electrode 4 area corresponding to the flow field ridge 3 which is difficult to reach, so that the concentration of the reaction gas in the area is increased, and the reaction efficiency of the CCM membrane electrode 4 is improved. Meanwhile, along with the cross-channel flow of the reaction gas, the generated water which is difficult to remove under the flow field ridge 3 can be taken away in the process, and the risk of flooding of the battery is reduced. Compared with the prior art, the utility model has the beneficial effects that: through the structural design of the variable cross-section channels, pressure difference is formed between the adjacent channels, so that reaction gas can flow across the channels, the concentration of the reaction gas in the region corresponding to the flow field ridge 3 is increased, the utilization region on the membrane is increased, and the electrochemical reaction is more uniform and stable; meanwhile, water which is difficult to drain in the area under the flow field ridge 3 is taken away, so that a water management system is improved, the risk of flooding of the battery is reduced, the failure rate is reduced, and the service life of equipment is prolonged; compared with a parallel flow field and a snake-shaped flow field structure, the structure can provide enough pressure drop to quickly discharge water generated by the fuel cell, has smaller pressure drop compared with an interdigitated flow field while providing enough pressure drop, can reduce the auxiliary consumption of a fuel cell system, and improves the output power.
The essence of the present invention is that the cross section of the adjacent flow field channels 2 changes periodically and alternately, and the change of the cross section includes but is not limited to the change of the groove width, as shown in fig. 4, and may also be a change of the groove depth, wherein the groove depth of the a section 21 becomes continuously smaller along the flowing direction of the reaction gas, and the groove depth of the B section 22 becomes continuously larger along the flowing direction of the reaction gas, and the effect is the same as that when the groove width changes. The variation in channel width of the flow field channels 2 may also take various forms, as shown in fig. 5, the channel width of the flow field channels 2 may vary in a zigzag pattern, and as shown in fig. 6, the channel width of the flow field channels 2 may also vary in a serpentine pattern. In addition, the groove depth and the groove width can be simultaneously and continuously changed, and the same technical effect can be achieved as long as the sectional area of the section A21 is continuously reduced and the sectional area of the section B22 is continuously increased.
To sum up, this utility model provides a proton exchange membrane fuel cell bipolar plate with variable cross section flow field passageway has effectively solved the membrane electrode region that reaction gas is difficult for reacing the flow field ridge and corresponds among the current bipolar plate flow field passageway, and the difficult scheduling problem that discharges of resultant water under the flow field ridge has very high use value and use meaning, can popularize and apply in a large number.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (6)
1.A proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channels comprises a bipolar plate body (1), and is characterized in that: the bipolar plate is characterized in that a plurality of flow field channels (2) distributed in parallel are arranged on the bipolar plate body (1) along the flowing direction of reaction gas, each flow field channel (2) is composed of a section A (21) and a section B (22) which are distributed in a multi-section continuous interval mode and are communicated with each other, the section area of the section A (21) is continuously reduced along the flowing direction of the reaction gas, the section area of the section B (22) is continuously increased along the flowing direction of the reaction gas, the length of the section A (21) is the same as that of the section B (22), the positions of the section A (21) and the section B (22) between two adjacent flow field channels (2) correspond to each other, and the section A (21) and the section B (22) are the same in shape of the section of a connecting part.
2. A pem fuel cell bipolar plate having a variable cross-section flow-field channel according to claim 1 wherein: the groove width of the section A (21) is continuously reduced along the flowing direction of the reaction gas, and the groove width of the section B (22) is continuously increased along the flowing direction of the reaction gas.
3. A pem fuel cell bipolar plate having a variable cross-section flow-field channel as claimed in claim 2 wherein: the groove width of the flow field channel (2) changes in a broken line shape.
4. A pem fuel cell bipolar plate having a variable cross-section flow-field channel as claimed in claim 2 wherein: the groove width of the flow field channel (2) changes in a winding curve type.
5. A pem fuel cell bipolar plate having a variable cross-section flow-field channel according to claim 1 wherein: the groove depth of the section A (21) is continuously reduced along the flowing direction of the reaction gas, and the groove depth of the section B (22) is continuously increased along the flowing direction of the reaction gas.
6. A pem fuel cell bipolar plate having a variable cross-section flow-field channel according to claim 1 wherein: the groove width and the groove depth of the section A (21) are both continuously reduced along the flowing direction of the reaction gas, and the groove width and the groove depth of the section B (22) are both continuously increased along the flowing direction of the reaction gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122659031.6U CN216624345U (en) | 2021-11-02 | 2021-11-02 | Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122659031.6U CN216624345U (en) | 2021-11-02 | 2021-11-02 | Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel |
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| CN216624345U true CN216624345U (en) | 2022-05-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039064A (en) * | 2021-11-02 | 2022-02-11 | 海卓动力(上海)能源科技有限公司 | Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel |
| CN115799558A (en) * | 2023-01-31 | 2023-03-14 | 苏州氢澜科技有限公司 | Bipolar plate of fuel cell |
| CN116404194A (en) * | 2023-03-01 | 2023-07-07 | 中汽创智科技有限公司 | A kind of unipolar plate, bipolar plate, stack and fuel cell |
-
2021
- 2021-11-02 CN CN202122659031.6U patent/CN216624345U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039064A (en) * | 2021-11-02 | 2022-02-11 | 海卓动力(上海)能源科技有限公司 | Proton exchange membrane fuel cell bipolar plate with variable cross-section flow field channel |
| CN115799558A (en) * | 2023-01-31 | 2023-03-14 | 苏州氢澜科技有限公司 | Bipolar plate of fuel cell |
| CN116404194A (en) * | 2023-03-01 | 2023-07-07 | 中汽创智科技有限公司 | A kind of unipolar plate, bipolar plate, stack and fuel cell |
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