CN113013437A - Fuel cell cathode flow channel with gradually-reduced slope surface structure - Google Patents
Fuel cell cathode flow channel with gradually-reduced slope surface structure Download PDFInfo
- Publication number
- CN113013437A CN113013437A CN201911327058.6A CN201911327058A CN113013437A CN 113013437 A CN113013437 A CN 113013437A CN 201911327058 A CN201911327058 A CN 201911327058A CN 113013437 A CN113013437 A CN 113013437A
- Authority
- CN
- China
- Prior art keywords
- flow channel
- flow
- section
- fuel cell
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
- H01M8/02—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
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
-
- 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
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 invention adopts the following technical scheme that the fuel cell cathode flow channel with the tapered slope structure comprises a straight line path section of the fuel cell cathode flow channel, a path section of the tapered structure and a U-shaped turning section of the slope structure. A reducing structure is arranged at the U-shaped turning inlet to reduce the area of the flow cross section of the airflow, the flow speed of the airflow is accelerated, the flooding phenomenon is improved, the outer wall of the U-shaped turning position forms a slope surface with a certain angle due to the difference of the upper surface area and the lower surface area, the flow path of liquid water in the flow channel is guided, and the water drop splashing phenomenon in the flow channel is reduced.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell cathode flow channel with a gradually-reduced slope structure.
Background
Under the premise that petroleum resources in the world are increasingly scarce and global warming is increasingly aggravated, the development of clean energy is more important, the application of hydrogen energy becomes the key point of the current world research, a fuel cell spans the heat engine process, the Carnot cycle does not exist, the chemical energy of fuel and oxidant is directly converted into electric energy, the energy conversion efficiency is extremely high, and therefore the fuel cell becomes one of the most promising power sources at present.
In Proton Exchange Membrane Fuel Cells (PEMFCs), water is generated in a cathode Catalyst Layer (CL), then transported to the surface of a Membrane Electrode (MEA) through a Gas Diffusion Layer (GDL), and finally flows out of a flow channel. To ensure a high proton conductivity of the Proton Exchange Membrane (PEM), its high water content must be maintained. However, excessive water in the fuel cell flow channels may hinder the effective path of oxygen diffusion, limiting the reaction rate of the Catalyst Layers (CLs), and greatly reducing the cell performance, which is called flooding, which may cause uneven distribution of reactants in the fuel cell, thereby causing problems of uneven current density, local hot spots in the membrane, performance degradation, and material aging. Channel flooding is a main factor restricting the performance of the fuel cell, and directly causes the performance reduction of the fuel cell, so that the water management of the cathode side of the fuel cell is very important for improving the performance of the cell, and the water management and the transport capacity of reactants to a porous gas diffusion layer and a catalytic layer need to be promoted by improving the channel structure and other actions.
Disclosure of Invention
The invention provides a novel cathode flow channel of a proton exchange membrane fuel cell, which reduces the problems of flooding blockage and droplet splashing in the flow channel.
The invention adopts the following technical scheme
The utility model provides a take fuel cell cathode flow channel of convergent slope structure, includes fuel cell cathode flow channel straight line along the journey section, convergent structure along journey section, slope structure U type turn section.
A reducing structure is arranged at the inlet of the U-shaped turn to reduce the area of the flow cross section of the airflow, and the outer wall of the U-shaped turn forms a slope surface with a certain angle due to the difference of the upper surface area and the lower surface area, so that the flow path of liquid water in the flow channel is guided.
The inlet of the fuel cell is a square with a conventional snake-shaped flow channel straight-line path section, the path length is 30mm, and the cross section area of the flow channel flow section is 1 mm' 1 mm.
And then enters a gradually-reduced structure along the way after passing through the straight line along the way, wherein the length of the way is 0.4-1.2 mm.
The terminal of the convergent section enters a U-shaped turning slope surface structure, and the cross section area of a flow passage of the U-shaped turning section is 0.8-0.9 mm2。
And symmetrical to the inlet section, enabling the U-shaped slope surface structure to enter a section of gradual expansion path section, and finishing with a straight line section after the sectional area of the air flow overflowing section is expanded to 1 mm' 1 mm.
The novel flow channels with the gradually-reduced slope surface structure are divided into a plurality of groups, at least two groups of flow channels are included, and the flow channels on the bipolar plate are distributed into a multi-channel snake-shaped flow field.
The novel multi-channel snakelike flow channel formed by the flow channel with the gradually-reduced slope surface structure is provided with the gradually-reduced slope surface structure at each U-shaped turning position.
Air is introduced into the upper right corner of a multi-channel snake-shaped flow field formed by the novel flow channels, and liquid water of reaction products is discharged from the lower left corner of the flow field.
The novel cathode flow channel of the fuel cell with the gradually-reducing slope surface structure is characterized in that liquid water in the flow channel is easily gathered at a corner, the gradually-reducing structure reduces the flow overflowing area of air flow, the flow overflowing speed of the air flow is increased, the slope structure formed by the U-shaped turning outer wall guides the air flow to the GDL surface so as to enhance mass transfer, the water drops are limited to splash to other walls under the condition that the air direction and the speed are changed sharply, the water management capacity of the fuel cell is enhanced, and the performance of the fuel cell is improved.
Drawings
FIG. 1 is a schematic view of a serpentine flow field formed by a plurality of novel flow channels;
fig. 2 is a schematic view of a tapered slope structure of the novel flow channel.
Wherein: 1. bipolar plate 2, snakelike runner U type turn 3, runner entry 4, runner entry 5, runner export 6, runner export 7, novel runner straight line is along journey section 8, novel runner convergent is along journey section 9, novel runner U type outer wall is domatic 10, novel runner U type inner wall is domatic.
Detailed Description
The novel flow channel design will now be described more fully hereinafter with reference to the accompanying drawings, which illustrate some, but not all embodiments of the invention. 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 scope of this patent.
In the description of the present invention, it should be noted that, as the terms "left", "right", "upper", "lower", "parallel", "vertical", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," "third," and the like, if any, are used for descriptive purposes only. And are not to be construed as indicating or implying relative importance.
The invention provides a novel flow channel structure of a fuel cell. This novel design runner includes: novel runner straight line is along the journey section, novel runner convergent structure section, novel runner U type is domatic section.
In the embodiment, the material of the bipolar plate is graphite plate with good electrical and thermal conductivity and corrosion resistance
Further, still include fixing bolt on the bipolar plate, the bipolar plate four corners all is provided with respectively with fixing bolt matched with first, second, third and fourth locating hole to make negative and positive polar plate ability interconnect, such connection is more stable, and the fuel cell pile of a plurality of monomer combinations is also more firm.
As shown in figure 1, the arrangement of the novel flow channels on the bipolar plate is a multi-channel serpentine layout, the flow channel inlets are uniformly distributed on the upper right corner of the bipolar plate in a word-shaped manner, the flow channel outlets are uniformly distributed on the lower left corner of the bipolar plate in a word-shaped manner, and the multiple flow channels are uniformly distributed in parallel.
The novel flow channel with the gradually-reduced slope surface structure is provided with a plurality of groups, at least two groups of flow channels are included, and the flow channels are distributed into a multi-channel snake-shaped flow field on the bipolar plate. And the U-shaped turning part of each multi-channel snake-shaped flow channel formed by the novel flow channels is provided with a gradually reducing slope surface structure.
In this embodiment, the air flow enters through the flow channel inlets 3 and 4. Liquid water and air are discharged from the channel outlets 5, 6 through the plurality of U-turn sections 2.
On the basis of the embodiment, the tapered slope surface structures are arranged at every U-shaped turning position of the multi-channel snake-shaped flow channel formed by the novel flow channel with the tapered slope surface structures.
The novel flow channel is formed by engraving a precise numerical control milling machine or a finishing impression machine strictly according to the design size
In this embodiment, the depth of the flow field groove formed by the novel flow channel is 1 mm.
The flow passage cross section can be in various shapes along the vertical and extending directions, and the flow passage cross section is transited from a square cross section to a trapezoidal cross section and then transited from the trapezoidal cross section to the square cross section.
Further, the novel design provides three different sizes of the tapered U-shaped flow channel.
The first flow channel gradually-reducing structure has a path length of 0.4mm, the cross section of the flow channel at the U-shaped turning structure is trapezoidal, and the cross sectional area is 0.9mm2And a slope surface with a certain angle is formed on the outer wall of the U-shaped structure. The U-shaped structure outlet is a gradually-expanding structure corresponding to the gradually-reducing structure, the length along the way is also 0.4mm, the gradually-expanding structure outlet is a straight-line along-the-way section, and gas and liquid pass through the straight-line along-the-way section discharge flow channel.
Correspondingly, the length of the reducing structure of the second flow channel is 1.2mm, the section of the flow channel at the U-shaped turning structure is trapezoidal, and the section area is 0.9mm2And a slope surface with a certain angle is formed on the outer wall of the U-shaped structure. The U-shaped structure outlet is a gradually-expanding structure corresponding to the gradually-reducing structure, the length along the way is also 1.2mm, the gradually-expanding structure outlet is a straight-line along-way section, and gas and liquid pass through the straight-line along-way section discharge flow channel.
Correspondingly, the length of the reducing structure of the third flow channel is 0.8mm, the section of the flow channel at the U-shaped turning structure is trapezoidal, and the section area is 0.8mm2Therefore, the inner wall and the outer wall of the U-shaped structure form a slope surface with a certain angle. The U-shaped structure outlet is a gradually-expanding structure corresponding to the gradually-reducing structure, the length along the way is also 0.8mm, the gradually-expanding structure outlet is a straight-line along-way section, and gas and liquid pass through the straight-line along-way section discharge flow channel.
The flow channels on the bipolar plate are all subjected to smoothing treatment, the contact angle between liquid water and the wall surface of the flow channel is increased, namely, the hydrophobic treatment is carried out, and the liquid water can be discharged out of the flow channels as soon as possible.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A novel cathode flow channel of a proton exchange membrane fuel cell is characterized by comprising a straight line path section, a gradually-reducing structure path section and a slope structure U-shaped turning section of the cathode flow channel of the fuel cell.
2. The flow field area flow channel structure is improved, a conventional snake-shaped flow channel structure is used as a building standard, a reducing structure is arranged at the inlet of the U-shaped turn so as to reduce the area of the flow cross section of the air flow, and the outer wall of the U-shaped turn forms a slope surface with a certain angle due to the difference of the upper surface area and the lower surface area so as to guide the flow path of liquid water in the flow channel.
3. The improved flow channel of claim 1, wherein: novel domatic runner straight line section part of convergent is 30mm, and the runner overflows square that section cross sectional area is 1 mm' 1mm, and U type turn round section entrance convergent section is 0.4-1.2 mm along journey length, and U type turn round section runner cross sectional area is 0.8-0.9 mm2The inner and outer walls of the U-shaped elbow form a slope surface due to the difference of the upper and lower surfaces.
4. The novel cathode flow channel as claimed in claim 1, wherein one end of the flow channel is an air flow inlet and the other end is a liquid water outlet, i.e. the air flow blows the excess liquid water out of the flow channel to avoid flooding.
5. The novel flow channel of claim 1 is in multiple groups, at least two groups, and is distributed on the bipolar plate as a multi-channel serpentine flow field.
6. The multi-channel serpentine flow channel of claim 4, wherein the tapered slope structure is disposed at each U-turn.
7. The novel flow channel of claim 4 wherein the flow field region is intermediate a fuel cell assembly bipolar plate and a gas diffusion layer.
8. The novel cathode flow channel of a fuel cell with a tapered slope surface structure as claimed in any one of claims 1 to 6, wherein liquid water in the flow channel is easy to gather at corners, the tapered structure reduces the flow cross-sectional area of the air flow and increases the flow velocity of the air flow, the slope structure formed by the outer wall of the U-shaped turn guides the air flow to the surface of the GDL to enhance mass transfer and is used for limiting water drops from splashing to other wall surfaces under the condition of rapid changes of the wind direction and the velocity, the liquid water can slide down the wall under the influence of the slope and crawl out of the fuel cell through the downstream channel on the surface of the GDL, and the required wettability of the GDL is ensured while the liquid water is retained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327058.6A CN113013437B (en) | 2019-12-20 | 2019-12-20 | Fuel cell cathode runner with gradually-reduced slope structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327058.6A CN113013437B (en) | 2019-12-20 | 2019-12-20 | Fuel cell cathode runner with gradually-reduced slope structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113013437A true CN113013437A (en) | 2021-06-22 |
| CN113013437B CN113013437B (en) | 2023-08-01 |
Family
ID=76381698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911327058.6A Active CN113013437B (en) | 2019-12-20 | 2019-12-20 | Fuel cell cathode runner with gradually-reduced slope structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113013437B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117352767A (en) * | 2023-12-04 | 2024-01-05 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564352A (en) * | 2004-03-25 | 2005-01-12 | 上海交通大学 | U-shaped gas collection-parellel current combined sprue of proton exchange membrance fuel cell |
| US20050271909A1 (en) * | 2004-06-07 | 2005-12-08 | Hyteon Inc. | Flow field plate for use in fuel cells |
| CN1949571A (en) * | 2006-11-09 | 2007-04-18 | 上海交通大学 | Proton exchange membrane fuel cell interdigited parallel combined flow field |
| EP1839360A1 (en) * | 2005-01-05 | 2007-10-03 | Powerdisc Development Corporation Ltd. | Improved fuel cell cathode flow field |
| CN101651217A (en) * | 2009-09-14 | 2010-02-17 | 新源动力股份有限公司 | Bipolar plate flow field structure of fuel cell beneficial to water management |
| CN102170002A (en) * | 2011-04-07 | 2011-08-31 | 沈阳建筑大学 | Fuel cell flow field structure with depth gradually-diminished flow channels |
| CN102201583A (en) * | 2011-04-22 | 2011-09-28 | 沈阳建筑大学 | Proton exchange membrane fuel cell flow field structure |
| CN103746129A (en) * | 2014-01-10 | 2014-04-23 | 上海交通大学 | Proton membrane fuel cell flow channels with optimized fuel cell drainage performance |
| CN104143645A (en) * | 2014-07-25 | 2014-11-12 | 天津大学 | Proton exchange membrane fuel cell flow channel |
-
2019
- 2019-12-20 CN CN201911327058.6A patent/CN113013437B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564352A (en) * | 2004-03-25 | 2005-01-12 | 上海交通大学 | U-shaped gas collection-parellel current combined sprue of proton exchange membrance fuel cell |
| US20050271909A1 (en) * | 2004-06-07 | 2005-12-08 | Hyteon Inc. | Flow field plate for use in fuel cells |
| EP1839360A1 (en) * | 2005-01-05 | 2007-10-03 | Powerdisc Development Corporation Ltd. | Improved fuel cell cathode flow field |
| CN1949571A (en) * | 2006-11-09 | 2007-04-18 | 上海交通大学 | Proton exchange membrane fuel cell interdigited parallel combined flow field |
| CN101651217A (en) * | 2009-09-14 | 2010-02-17 | 新源动力股份有限公司 | Bipolar plate flow field structure of fuel cell beneficial to water management |
| CN102170002A (en) * | 2011-04-07 | 2011-08-31 | 沈阳建筑大学 | Fuel cell flow field structure with depth gradually-diminished flow channels |
| CN102201583A (en) * | 2011-04-22 | 2011-09-28 | 沈阳建筑大学 | Proton exchange membrane fuel cell flow field structure |
| CN103746129A (en) * | 2014-01-10 | 2014-04-23 | 上海交通大学 | Proton membrane fuel cell flow channels with optimized fuel cell drainage performance |
| CN104143645A (en) * | 2014-07-25 | 2014-11-12 | 天津大学 | Proton exchange membrane fuel cell flow channel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117352767A (en) * | 2023-12-04 | 2024-01-05 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
| CN117352767B (en) * | 2023-12-04 | 2024-02-23 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113013437B (en) | 2023-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100984934B1 (en) | Fuel cell | |
| US20110274999A1 (en) | Fuel cell stack | |
| CN110212214B (en) | Bipolar plate flow field structure in fuel cell and bipolar plate | |
| CN112786913B (en) | Bipolar plate and fuel cell comprising same | |
| US10756357B2 (en) | Bipolar plate with coolant flow channel | |
| CN108028397B (en) | Separator and fuel cell stack including the same | |
| CN215771215U (en) | Battery bipolar plate distribution head, proton exchange membrane fuel cell and unmanned sailing boat | |
| CN113097530B (en) | Improved connecting piece for flat-plate solid oxide fuel cell stack and thermal management method | |
| JP2006012466A (en) | Fuel cell | |
| CN113707902A (en) | Bipolar plate of hydrogen fuel cell and hydrogen fuel cell | |
| KR101092486B1 (en) | Flow channel plate for fuel cell | |
| CN113013437A (en) | Fuel cell cathode flow channel with gradually-reduced slope surface structure | |
| CN116826094A (en) | Flow guiding type porous flow passage for hydrogen fuel cell and bipolar plate structure | |
| CN115513486B (en) | Monopolar plate, bipolar plate, electric pile and fuel cell | |
| CN217114451U (en) | Polar plate and fuel cell | |
| KR101534940B1 (en) | Bipolar plate for fuel cell and fuel cell using the same | |
| KR101636613B1 (en) | Separator for Fuel Cell and High Temperature Polymer Electrolyte Membrane Fuel Cell Having the Same | |
| CN217035679U (en) | Metal bipolar plate and proton exchange membrane fuel cell | |
| CN115692759A (en) | Flow field structure of bipolar plate of fuel cell | |
| CN212783524U (en) | Monopolar plate, bipolar plate and fuel cell | |
| CN219393428U (en) | Fuel cell flow field plate with porous metal distribution and collection areas | |
| CN114725423B (en) | Bipolar plate and fuel cell | |
| CN220253276U (en) | Fuel cell bipolar plate and fuel cell | |
| CN113013435B (en) | Flow channel layout of proton exchange membrane fuel cell taking biological blood vessel as inspiration | |
| CN210379269U (en) | Bipolar plate of fuel cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |