CN114628721B - Fuel cell stack - Google Patents
Fuel cell stack Download PDFInfo
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- CN114628721B CN114628721B CN202011470322.4A CN202011470322A CN114628721B CN 114628721 B CN114628721 B CN 114628721B CN 202011470322 A CN202011470322 A CN 202011470322A CN 114628721 B CN114628721 B CN 114628721B
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- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 238000012546 transfer Methods 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims description 50
- 239000007800 oxidant agent Substances 0.000 claims description 28
- 230000001590 oxidative effect Effects 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 38
- 239000007789 gas Substances 0.000 abstract description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 14
- 239000001257 hydrogen Substances 0.000 abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 34
- 210000004027 cell Anatomy 0.000 description 17
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
-
- 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
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The novel fuel cell stack has the advantages that the cooling oil cavity adopts the double-inlet and double-outlet modes, single-cell temperature distribution between two paths of cooling cavities is improved, meanwhile, the oil cavity side adopts a corrugated design, turbulence is enhanced, heat transfer is enhanced, and cooling effect is improved; the air and hydrogen sides form a convergent-divergent runner through the corrugated runner, so that the mass transfer of the gas is enhanced, and the pile performance is improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell stack which can effectively improve the temperature distribution uniformity of an internal bipolar plate, strengthen the cooling effect, enhance mass transfer, improve the current density and improve the performance of the stack.
Background
A fuel cell is a device that directly converts chemical energy stored in a compound fuel into electric energy through a chemical reaction. The bipolar plate is used as a core component of the fuel cell, plays important roles of supporting a membrane electrode, separating hydrogen and oxygen, collecting electrons, conducting heat, providing a cooling flow channel and the like, and the performance of the bipolar plate is greatly dependent on a flow field structure.
In the running process of the battery, a great amount of heat is generated when the electrochemical reaction occurs, the electric pile needs to be cooled to maintain the normal running temperature of the electric pile, and the cooling effect and the temperature distribution uniformity of each single cell surface greatly influence the performance of the electric pile.
The cathode and anode of the bipolar plate flow channel of the fuel cell are respectively filled with air and hydrogen, because the constraint of the flow speed and the flow channel size is basically in a laminar flow state, the mass transfer effect is greatly limited, how to improve the mass transfer effect of the gas side, and the enhancement of turbulent flow is always the direction of intensive research, but the addition of turbulent flow pieces can bring about great improvement of pressure drop and manufacturing difficulty.
The invention provides a novel fuel cell bipolar plate and a galvanic pile, which improve the uniformity of single-cell temperature distribution between two paths of cooling cavities and improve the cooling effect; the mass transfer of the reaction gas is enhanced, the gas residence time is increased, the current density is improved, and the galvanic pile performance is improved.
Disclosure of Invention
The invention provides a fuel cell stack, a cooling oil cavity adopts a double-inlet and double-outlet mode, single-cell temperature distribution between two paths of cooling cavities is improved, and meanwhile, the oil cavity side adopts a corrugated design, so that turbulence is enhanced, heat transfer is enhanced, and cooling effect is improved; the air and hydrogen sides form a convergent-divergent runner through the corrugated runner, so that the mass transfer of the gas is enhanced, and the pile performance is improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A fuel cell stack comprises N MEAs and N-1 bipolar plate groups, wherein N is an integer greater than or equal to 3, and the MEAs and the bipolar plate groups are alternately overlapped one by one in sequence; the bipolar plate group is formed by stacking two bipolar plates;
the two side surfaces of one bipolar plate in the bipolar plate group are respectively provided with a fuel flow field and a coolant flow field, and the two side surfaces of the other bipolar plate are respectively provided with an oxidant flow field and a coolant flow field;
The coolant flow fields of the two bipolar plates are oppositely arranged and laminated to form a bipolar plate group, and the coolant flow fields of the two bipolar plates are all formed by a serpentine flow field group; the serpentine flow field group is composed of more than 2 parallel flow fields; each parallel flow field is a corrugated flow channel; the coolant flow fields on two different bipolar plates of the same bipolar plate group are arranged in a staggered way.
The staggered arrangement is that the corrugated flow channels on the surface of one bipolar plate project to the surface of the other bipolar plate, and the projected corrugated flow channels are staggered with the corrugated flow channels on the surface of the other bipolar plate.
The number of the ripple flow channels in the coolant flow fields on the bipolar plates oppositely arranged in the bipolar plate group is the same, the wavelength of the ripple flow channels is the same, the peak heights are the same, the frequency is the same, the ripple flow channel on the surface of one bipolar plate projects to the surface of the other bipolar plate, and the ripple frequency of the ripple flow channel on the surface of the projection ripple flow channel and the ripple flow channel on the surface of the other bipolar plate is different by 1/3-2/3, so that a staggered structure is formed.
The wave crest of the projection corrugated flow channel corresponds to the wave trough of the corrugated flow channel on the surface of the other bipolar plate, and the wave trough of the projection corrugated flow channel corresponds to the wave crest of the corrugated flow channel on the surface of the other bipolar plate.
The corrugation of the corrugated flow channel is a fold line or an arc line, the fold angle of the fold line is between 20 and 160 degrees, the heat transfer performance and the pressure drop can be adjusted by changing the size of the fold angle, the smaller the fold angle is, the better the heat transfer performance is, the larger the pressure drop is, the larger the fold angle is, the better the heat transfer performance is, the lower the pressure drop is, and the fold angle is preferably between 80 and 100 degrees.
The periphery of the bipolar plate is provided with a fuel inlet, a fuel outlet, an oxidant inlet, an oxidant outlet, two coolant inlets and two coolant outlets; one coolant inlet is located directly above or above the left side of the other coolant inlet, and one coolant outlet is located directly above or below the right side of the other coolant inlet;
the fuel inlet and the fuel outlet of one bipolar plate in the bipolar plate group are communicated with the fuel flow field on the bipolar plate group, and the oxidant inlet and the oxidant outlet of the other bipolar plate are communicated with the oxidant flow field on the bipolar plate group; a coolant inlet located above and a coolant outlet located below are in communication with the coolant flow field thereon;
The fuel inlet and the fuel outlet of one bipolar plate in the adjacent bipolar plate group are communicated with the fuel flow field on the bipolar plate, and the oxidant inlet and the oxidant outlet of the other bipolar plate are communicated with the oxidant flow field on the bipolar plate; the other coolant inlet located below and the other coolant outlet located above are in communication with the coolant flow field thereon.
The bipolar plate is rectangular, the fuel inlet and the oxidant inlet or the oxidant outlet are arranged on one side, and the fuel outlet and the oxidant outlet or the oxidant inlet are arranged on one side;
The two coolant inlets and the two coolant outlets are respectively arranged on the other two sides, or the other two sides are respectively provided with a coolant inlet and a coolant outlet; the coolant of one bipolar plate in the adjacent bipolar plate group enters from top to bottom, the coolant of the other bipolar plate enters from bottom to top, and the macroscopic flow directions of the liquid are opposite.
The opposite fuel flow field and oxidant flow field in the adjacent bipolar plate group at two sides of one MEA are serpentine flow fields formed by more than 2 parallel flow channels which are sequentially arranged and are sequentially spaced; the flow channels are periodical convergent and divergent flow channels with the same size and shape;
The flow channel on the surface of one bipolar plate projects to the surface of the other bipolar plate, the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially overlapped, the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially staggered, and the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially staggered.
And a turbolator is arranged in the gradually widened area of the gradually-narrowed and gradually-widened flow channel.
The fuel cell stack provided by the invention has the advantages that the cooling oil cavity adopts the double-inlet and double-outlet modes, and the inlets and the outlets of the adjacent cooling flow channels are arranged on the same side of the bipolar plate, so that the defects of gradual temperature rise, weakening of the tail end heat dissipation capability and large inlet and outlet temperature difference in the flowing process of cooling oil are avoided, and the temperature distribution of a single cell between two cooling cavities is greatly improved; meanwhile, the corrugated design is adopted at the oil cavity side, when two bipolar plates form an oil cavity, the corrugated frequency of the cooling cavities of the two bipolar plates is different by 1/3-2/3, wave crests and wave troughs are opposite, contact and cross to form a plurality of contacts, so that the compressive strength is enhanced, and meanwhile, the combination of the cross enables the medium of adjacent cooling flow channels to mix and convect, so that the cooling oil is fully mixed, and the heat transfer performance is superior to that of a straight channel with the same cross section. The crossed arrangement not only can cause high-efficiency heat exchange, but also can adjust the angle and the density of the corrugation according to different requirements of different parts of the galvanic pile on heat exchange or pressure drop, so that the temperature of the galvanic pile is kept uniform or the pressure drop meets the requirements.
The air and hydrogen sides form a gradually-shrinking and gradually-expanding flow passage through the corrugated flow passage, so that the flow velocity of the gas is changed continuously to enable the gas to form turbulence more easily, a large space is formed at a wave crest, a rotating vortex is formed, the mass transfer of the gas is strengthened together, the gas disturbance is strengthened, the mass transfer is strengthened, the gas is enabled to enter a diffusion layer more easily, the gas can form a vortex in the flow passage, the gas residence time is prolonged, the current density is improved, and the galvanic pile performance is improved; the included angle and the width of the ripple can be adjusted by the flow channel, and the pressure drop is controlled without great improvement. The corrugated flow channels of the air hydrogen are crossed (wave crest to wave trough), so that the compressive strength is enhanced.
Drawings
Fig. 1 is a schematic diagram of an inlet and an outlet of a cooling oil cavity 1 of a bipolar plate of a galvanic pile.
Fig. 2 is a schematic diagram of the inlet and outlet of the cooling oil cavity 2 of the bipolar plate of the electric pile.
Fig. 3 is a schematic diagram showing cooling effects of a conventional flat flow channel, i.e., one inlet and one outlet (a), a corrugated flow channel, i.e., one inlet and one outlet (b), and a corrugated flow channel, i.e., two inlets and two outlets (c).
Fig. 4 is a schematic diagram of a surface a and a surface b of a cooling oil cavity of a bipolar plate of a galvanic pile.
FIG. 5 is a schematic view of a cooling gallery flow path for a bipolar plate of a stack in accordance with the present invention.
Fig. 6 is a schematic view of different corrugated corner combinations of the oil side flow channels of the bipolar plate of the present invention.
Fig. 7 is a schematic diagram of an air and hydrogen side stream of a bipolar plate of a stack of the present invention.
FIG. 8 is a schematic diagram of a stack bipolar plate air and hydrogen side stream assembly of the present invention.
Fig. 9 is a schematic view of the outer structure of the electric pile of the present invention.
Fig. 10 is a schematic diagram of a galvanic pile repeat unit according to the invention.
Fig. 11 is a schematic view of the oil path diversion structure of the upper end plate of the present invention.
In the figure: A. inlet of oil cavity 1, outlet of oil cavity 2, inlet of oil cavity 1, inlet of oil cavity 2, inlet of E, hydrogen gas, inlet of F, air, outlet of G, hydrogen gas, outlet of H, air, inlet of I, total oil, outlet of J, total oil
1. The fuel/air/hydrogen bipolar plate integrated electric pile comprises an upper end plate, a lower end plate and a tensioning rod.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention adopts a double-inlet and double-outlet form, the inlet and outlet of adjacent cooling channels are at the same end of the bipolar plate, namely the hot end and the cold end, (see the upper and lower ends of the bipolar plates in figures 1 and 2), A is the inlet end (temperature 150 ℃/experimental data) of a coolant cavity (oil cavity), C is the outlet end (temperature 155 ℃/experimental data) of the oil cavity 1, D is the inlet end (temperature 150 ℃/experimental data) of the oil cavity 2, B is the outlet end (temperature 155 ℃/experimental data) of the oil cavity 2, A, D is at the same side (left side of figures 1 and 2), B, C is at the same side (right side of figures 1 and 2), a confluence connecting pipe is convenient, the same flow state of the same channels can be approximately considered as that the temperature increase and decrease at the same speed, the low temperature end of the adjacent cooling oil cavity corresponds to the high temperature end of the other oil cavity, the defects of poor heat dissipation capability of the tail end of the traditional one-in cooling channel and large temperature difference of the inlet and outlet are overcome, the temperature distribution uniformity of a single cell between the two cooling channels is greatly improved, meanwhile, the oil cavity side adopts a corrugated design, the principle can be referred to, the effect in figure 3, and the temperature difference in figure 3 (a) is the same temperature difference in the traditional heat transfer channel (5 ℃ and the inlet and outlet) is compared with the inlet and outlet in the same channel) in the same temperature difference in the conventional channel (5); in fig. 3, (b) and (c) show that the corrugated flow passage is in uniform inlet-outlet arrangement and in uniform inlet-outlet arrangement, the temperature between two cooling oil cavities is between 150 ℃ and 155 ℃, and the floating can be kept between 2 ℃ with the highest and lowest average temperature of 152.5 ℃ as a standard;
The corrugated design of the cooling oil cavity side is described as follows, when two bipolar plates form a coolant cavity, the corrugated frequency of the two bipolar plates is different by 3-2/3, the corrugated wave crests and the wave troughs of the two bipolar plates are opposite, see a and b in fig. 4, contact and intersect to form a plurality of contacts, so that the compressive strength is enhanced, and meanwhile, the combination of the intersection enables the medium of adjacent cooling flow channels to mix and convect, so that the cooling oil is fully mixed, and the flow form of the flow field in fig. 5 is adopted; the crossed arrangement not only can cause high-efficiency heat exchange and strengthen the cooling effect, but also can adjust the angles and the densities of the corrugations according to the different requirements of different parts of the galvanic pile on heat exchange or pressure drop, so that the temperature of the galvanic pile is kept uniform or the pressure drop meets the requirements, as shown in figure 6, under the same flow rate of 1m/s, the same medium and inlet temperature, the inlet-outlet temperature difference reaches 8 ℃ and the pressure drop is 4.2kPa when the corrugated folding angle of the flow channel is 20 ℃; when the corrugated angle of the flow channel is 90 degrees, the temperature difference between the inlet and the outlet reaches 5 ℃ and the pressure drop is 2.5kPa; when the corrugated angle of the flow channel is 160 degrees, the temperature difference between the inlet and the outlet reaches 2.5 ℃ and the pressure drop is 1.3kPa.
The air side and the hydrogen side adopt tapered and gradually-expanding flow channels, as shown in a and b in fig. 7, the form of the tapered and gradually-expanding flow channels continuously changes the flow velocity of the gas to enable the gas to form turbulence more easily, a large space is formed at a wave crest, two rotating eddies can be formed, the mass transfer of the gas is strengthened jointly, the gas disturbance is strengthened, the mass transfer is strengthened, the gas is enabled to enter a diffusion layer more easily, the gas can form eddies in the flow channels, the gas residence time is prolonged, the current density is improved, and the galvanic pile performance is improved; the turbulence pieces such as square columns and the like can be manufactured in the middle of each section of the gradually expanded flow passage, as shown in c and d in fig. 7, the lifting effect is more obvious, but the manufacturing difficulty and the cost are increased, and the influence of pressure loss improvement is brought.
The included angle and the width of the ripple can be adjusted by the flow channel, and the pressure drop is controlled without great improvement. The corrugated channels of air and hydrogen are crossed (wave crest to wave trough), as shown in figure 8, and the compressive strength is enhanced.
As shown in fig. 9, the fuel cell stack comprises an Oil/Air/hydrogen bipolar plate integrated stack 1, an upper end plate 2, a lower end plate 3 and a tension rod 4, wherein a single cell (MEA) can be matched with one path of cooling Oil cavity in the stack, the repeated unit of the stack is Oil1-Air-MEA-H 2 -Oil2, as shown in fig. 10, a plurality of (2-3) single cells can share one cooling Oil cavity, the cooling Oil cavity and the outlet position of the gas side are as described by the previous bipolar plate, a plurality of identical units form the stack, the periphery of each path of fluid in the stack is sealed by a sealing gasket, the repeated units are overlapped and combined and compressed by the upper end plate 2, the lower end plate 3 and the tension rod 4 to form the stack, a cooling Oil path, an Air inlet and an Air inlet are integrated on the upper end plate, the upper end plate Oil path is provided with a split structure and is uniformly divided into two paths of inlets and outlets, as shown in fig. 11, the inside of the stack is cooled by two paths of circulating Oil paths, and the outside Air and the hydrogen enters the stack from respective inlets to participate in the reaction and then flows out from outlets.
The novel fuel cell stack improves the uniformity of single-cell temperature distribution between two paths of cooling cavities, and improves the cooling effect; the mass transfer of the reaction gas is enhanced, the gas residence time is increased, the current density is improved, and the galvanic pile performance is improved.
Claims (6)
1. A fuel cell stack comprises N MEAs and N-1 bipolar plate groups, wherein N is an integer greater than or equal to 3, and the MEAs and the bipolar plate groups are alternately overlapped one by one in sequence; the bipolar plate group is formed by stacking two bipolar plates;
the two side surfaces of one bipolar plate in the bipolar plate group are respectively provided with a fuel flow field and a coolant flow field, and the two side surfaces of the other bipolar plate are respectively provided with an oxidant flow field and a coolant flow field;
the method is characterized in that: the coolant flow fields of the two bipolar plates are oppositely arranged and laminated to form a bipolar plate group, and the coolant flow fields of the two bipolar plates are all formed by a serpentine flow field group; the serpentine flow field group is composed of more than 2 parallel flow fields; each parallel flow field is a corrugated flow channel; the coolant flow fields on two different bipolar plates of the same bipolar plate group are arranged in a staggered way;
The staggered arrangement is that the corrugated flow channels on the surface of one bipolar plate project to the surface of the other bipolar plate, and the projected corrugated flow channels are staggered with the corrugated flow channels on the surface of the other bipolar plate; the periphery of the bipolar plate is provided with a fuel inlet, a fuel outlet, an oxidant inlet, an oxidant outlet, two coolant inlets and two coolant outlets; one coolant inlet is located directly above or above the left side of the other coolant inlet, and one coolant outlet is located directly above or below the right side of the other coolant inlet;
The fuel inlet and the fuel outlet of one bipolar plate in the bipolar plate group are communicated with the fuel flow field on the bipolar plate group, and the oxidant inlet and the oxidant outlet of the other bipolar plate are communicated with the oxidant flow field on the bipolar plate group; a coolant inlet located above and a coolant outlet located below are in communication with corresponding coolant flow fields thereon;
The fuel inlet and the fuel outlet of one bipolar plate in the adjacent bipolar plate group are communicated with the fuel flow field on the bipolar plate, and the oxidant inlet and the oxidant outlet of the other bipolar plate are communicated with the oxidant flow field on the bipolar plate; the other coolant inlet and the other coolant outlet positioned below and above are communicated with the corresponding coolant flow fields thereon;
The number of the corrugated flow channels in the coolant flow field on the bipolar plate arranged oppositely in the bipolar plate group is the same, the wavelength of the corrugated flow channels is the same, the peak height is the same, the frequency is the same, and the corrugated flow channels are arranged oppositely one by one; the corrugated flow channel on the surface of one bipolar plate is projected to the surface of the other bipolar plate, and the corrugated frequency of the projected corrugated flow channel is different from that of the corrugated flow channel corresponding to the surface of the other bipolar plate by 1/3-2/3, so that a staggered structure is formed; the opposite fuel flow field and oxidant flow field in the adjacent bipolar plate group at two sides of one MEA are serpentine flow fields formed by more than 2 parallel flow channels which are sequentially arranged and are sequentially spaced; the flow channels are periodical convergent and divergent flow channels with the same size and shape;
the flow channels on the surfaces of the two bipolar plates are in one-to-one correspondence, the flow channel on the surface of one bipolar plate projects to the surface of the other bipolar plate, the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially overlapped, the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially staggered, and the projection flow channel gradual expansion area and the flow channel gradual expansion area on the surface of the other bipolar plate are sequentially staggered.
2. A fuel cell stack in accordance with claim 1, wherein: the wave runner of one bipolar plate surface projects to the other bipolar plate surface, the wave crest of the projection wave runner corresponds to the wave trough of the wave runner corresponding to the other bipolar plate surface, and the wave trough of the projection wave runner corresponds to the wave crest of the wave runner corresponding to the other bipolar plate surface.
3. A fuel cell stack in accordance with claim 1, wherein:
The corrugation of the corrugated flow channel is a fold line and/or an arc line, the fold angle of the fold line is between 20 and 160 degrees, the heat transfer performance and the pressure drop are adjusted by changing the size of the fold angle, the smaller the fold angle is, the better the heat transfer performance is but the larger the pressure drop is, the larger the fold angle is, the better the heat transfer performance is but the pressure drop is lower.
4. A fuel cell stack in accordance with claim 1, wherein: the bipolar plate is rectangular, the fuel inlet and the oxidant inlet or the oxidant outlet are arranged on one side, and the fuel outlet and the oxidant outlet or the oxidant inlet are arranged on one side;
The two coolant inlets and the two coolant outlets are respectively arranged on the other two sides, or the other two sides are respectively provided with a coolant inlet and a coolant outlet; the coolant of one bipolar plate in the adjacent bipolar plate group enters from top to bottom, the coolant of the other bipolar plate enters from bottom to top, and the macroscopic flow directions of the liquid are opposite.
5. A fuel cell stack in accordance with claim 1, wherein: the gradually widened area of the gradually-narrowed and gradually-widened flow channel is provided with a columnar protrusion serving as a turbolator.
6. A fuel cell stack in accordance with claim 1, wherein: the periodic convergent-divergent flow passages are sequentially connected in series by more than 2 convergent-divergent flow passages;
the convergent-divergent flow passage refers to one or more than two flow passages with prismatic, circular and elliptic cross sections parallel to the plate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011470322.4A CN114628721B (en) | 2020-12-14 | 2020-12-14 | Fuel cell stack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011470322.4A CN114628721B (en) | 2020-12-14 | 2020-12-14 | Fuel cell stack |
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| CN114628721A CN114628721A (en) | 2022-06-14 |
| CN114628721B true CN114628721B (en) | 2024-05-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993985A (en) * | 2019-12-14 | 2020-04-10 | 中国科学院大连化学物理研究所 | Flow channel structure of metal bipolar plate flow field of fuel cell |
| CN211700448U (en) * | 2020-09-04 | 2020-10-16 | 河南豫氢动力有限公司 | High-reliability bipolar plate of vehicle fuel cell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7745062B2 (en) * | 2002-10-28 | 2010-06-29 | Honda Motor Co., Ltd. | Fuel cell having coolant inlet and outlet buffers on a first and second side |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993985A (en) * | 2019-12-14 | 2020-04-10 | 中国科学院大连化学物理研究所 | Flow channel structure of metal bipolar plate flow field of fuel cell |
| CN211700448U (en) * | 2020-09-04 | 2020-10-16 | 河南豫氢动力有限公司 | High-reliability bipolar plate of vehicle fuel cell |
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