CN109935851A - A kind of polarized flow field of reduction cathode in direct methanol fuel cells mass transfer - Google Patents
A kind of polarized flow field of reduction cathode in direct methanol fuel cells mass transfer Download PDFInfo
- Publication number
- CN109935851A CN109935851A CN201711370618.7A CN201711370618A CN109935851A CN 109935851 A CN109935851 A CN 109935851A CN 201711370618 A CN201711370618 A CN 201711370618A CN 109935851 A CN109935851 A CN 109935851A
- Authority
- CN
- China
- Prior art keywords
- flow field
- bipolar plate
- width
- runner
- comb
- 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
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Fuel Cell (AREA)
Abstract
A kind of polarized flow field of reduction cathode in direct methanol fuel cells mass transfer.The present invention provides a kind of bipolar plate flow field, has import, outlet, runner, and the runner is multiple-unit symmetric teeth combed；A pair of of stripping fork of each unit by mirror symmetry, the comb teeth that intersects composition；In the direction by the outlet of import flow direction, the multiple unit is arranged successively, which can promote electrode axial direction mass transfer, is reduced cathode mass-transfer polarization, is improved fuel battery performance, and easy to process, convenient for large-scale production.The present invention is smaller than traditional interdigitated flow field resistance, considerably reduces the energy consumption of fuel cell system.The present invention is branch flow passage to be arranged again under branch flow passage, that is, second level branch flow passage is staggered, and ridge lower channel length is shorter, therefore the air drag in flow field is smaller.
Description
Technical field
The invention belongs to the improved technologies of fuel-cell device.Specifically, belong to the cathode of direct methanol fuel cell
Flow field improved technology.
Background technique
Currently, the bipolar plate structure of direct methanol fuel cell, there is snake type, interdigitated, leaf etc., wherein snakelike groove knot
Structure is simple, and groove stroke is longer, and biggish linear loss causes pressure drop higher, in this way can to cathode supply air pump bring compared with
Big burden, and longer ridge has larger adhesion strength to water droplet, and the diffusion layer for being easily collected on water droplet under ridge is difficult to be discharged, and leads
Cause cathode axial direction mass transfer effect poor.Traditional interdigitated flow field is big compared with serpentine flow resistance, because serpentine flow inlet and outlet have
Groove connection, and interdigitated flow field is connected to without groove, the transmission of gas can only pass through the diffusion layer under ridge.Therefore, cathode is necessary
The new flow field that the structure of setting is simple, flow resistance is small, drainage is good.
Summary of the invention
The purpose of the present invention is to provide a kind of polarized interdigitated flow field of reduction cathode in direct methanol fuel cells mass transfer,
The flow field can promote electrode axial direction mass transfer, reduce cathode mass-transfer polarization, improve fuel battery performance, and easy to process, be convenient for
Large-scale production.
The present invention is realized by following proposal, bipolar plate flow field, has import, outlet, runner, the runner
For multiple-unit symmetric teeth combed；A pair of of stripping fork of each unit by mirror symmetry, the comb teeth that intersects composition；It is flowed to by import
On the direction of outlet, the multiple unit is arranged successively.
The quantity of the unit is 4~8.
Each stripping fork is made of a bright and several comb teeth of comb, and the quantity of the comb teeth is 2~20.
The depth of the comb teeth is 0.2~2mm, and the width of comb handle is 0.4~4mm, and the width of comb teeth is 0.1~0.4mm.
The runner is alternate by ridge.
The width of the runner and the width of ridge are equal.
The width of the ridge is 0.1~0.4mm
The preparation method of above-mentioned bipolar plate flow field can also be provided in the present invention, which is characterized in that using graphite as raw material making sheet, benefit
With engraving machine engraving groove in graphite plate, groove constitutes the stripping fork.
Methanol fuel cell, including any of the above-described kind of bipolar plate flow field can also be provided in the present invention.
Beneficial effect
(1) width of ridge and the groove as flow field is the capillary structure of 0.1~0.4mm, plays the role of capillary,
Surface tension of liquid, cohesive force and adhesive force collective effect allow water droplet to creep in the trench, and the fluid column for characterizing capillary force is high
Degreeγ is surface tension coefficient, and θ is liquid surface and surface of solids contact angle, and r is capillary radius, theoretical
The upper smaller capillary force of r is bigger.Through theoretical calculation, capillary force is for diffusion layer when capillary structure width is at least below 0.4mm
Suction-operated is obvious, and drainage effect is good, but capillary structure width should be not less than 0.1mm, and not so air drag will significantly increase.
(2) present invention is smaller than traditional interdigitated flow field resistance, considerably reduces the energy consumption of fuel cell system.Tradition
Interdigitated runner, mainly formed with two sprues and two group of branches runners, branch flow passage is staggered；The present invention is to divide
Branch flow passage is set again, that is, second level branch flow passage is staggered, ridge lower channel length is shorter, therefore flow field under branch flow passage
Air drag it is smaller.
(3) under high current density working condition, easily there is mass transfer polarization, such as Fig. 2 in serpentine flow, and bipolar plates of the present invention
Flow field due under ridge drainage effect it is preferable, in 350~400mA/cm2Current density section is still without there is mass transfer polarization, it is seen that
Bipolar plate flow field mass transfer polarization limiting current density of the present invention is higher.
Detailed description of the invention
2 width of attached drawing of the present invention；
Fig. 1 bipolar plate flow field graphite plate of the present invention；
Fig. 2 prior art serpentine flow and bipolar plate flow field performance comparison of the present invention；
In figure, 1. comb teeth；2. comb handle.
Specific embodiment
Pole plate is using graphite as raw material, using engraving machine engraving groove in graphite plate, such as Fig. 1.Flow field structure is multipair tooth
The flow field of comb-type structure, the comb teeth of each pair of stripping fork, which intersects, forms a unit, and each tooth comb-type structure is by comb teeth and comb handle
Composition；In upstream, gas initially enters comb handle, is subsequently dispersed each comb teeth, but must enter downstream comb teeth knot by diffusion layer
Structure purges the water droplet assembled under ridge in the process, achievees the purpose that strengthen mass transfer；In downstream, gas-liquid mixed media is by comb teeth
It is converged to comb handle, outflow outlet；Multiple groups unit need to be set, settable 4~8, comb structure number is 2~20, the width in flow field
D=4 × n × m × d,
Wherein n is comb handle quantity, and m is comb teeth quantity, and d is comb teeth width, and comb teeth width is equal with ridge width.
N be greater than 4, m be greater than 2, comb teeth depth be arranged 0.2~2mm, comb handle 0.4~4mm of width, comb teeth width 0.1~
0.4mm, 0.1~0.4mm of ridge width.
Embodiment
1. bipolar plates are using graphite as raw material, using engraving machine engraving groove in graphite plate.
2. flow field structure is the flow field composition of 4 pairs of tooth comb-type structures, such as Fig. 1.Each pair of tooth comb-type structure flow field comb teeth (1) phase
Mutually intersect one unit of composition；In upstream, gas first passes around import main channel, then enters comb handle (2) by bend, then
3 comb teeth (1) are distributed to, 3, downstream comb teeth (1) structure is entered by diffusion layer；In downstream, gas-liquid mixed media from comb teeth to
Comb handle (2) convergence, outflow outlet；0.3mm, comb handle (2) width 1.2mm, comb teeth width 0.35mm can be set in the depth of comb teeth,
Ridge width 0.35mm.
Claims (9)
1. bipolar plate flow field has import, outlet, runner, which is characterized in that
The runner is multiple-unit symmetric teeth combed；
A pair of of stripping fork of each unit by mirror symmetry, the comb teeth that intersects composition；
In the direction by the outlet of import flow direction, the multiple unit is arranged successively.
2. bipolar plate flow field according to claim 1, which is characterized in that the quantity of the unit is 4~8.
3. bipolar plate flow field according to claim 1, which is characterized in that each stripping fork is by a bright and several comb of comb
Tooth is constituted, and the quantity of the comb teeth is 2~20.
4. bipolar plate flow field according to claim 1, which is characterized in that the depth of the comb teeth is 0.2~2mm, comb handle
Width be 0.4~4mm, the width of comb teeth is 0.1~0.4mm.
5. bipolar plate flow field according to claim 1, which is characterized in that the runner is alternate by ridge.
6. bipolar plate flow field according to claim 5, which is characterized in that the width of the runner and the width of ridge are equal.
7. bipolar plate flow field according to claim 5, which is characterized in that the width of the ridge is 0.1~0.4mm.
8. the preparation method of bipolar plate flow field described in claim 1-7 any one, which is characterized in that using graphite as raw material system
Plate, using engraving machine engraving groove in graphite plate, groove constitutes the stripping fork.
9. methanol fuel cell, including bipolar plate flow field described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711370618.7A CN109935851B (en) | 2017-12-19 | 2017-12-19 | Flow field for reducing mass transfer polarization of cathode of direct methanol fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711370618.7A CN109935851B (en) | 2017-12-19 | 2017-12-19 | Flow field for reducing mass transfer polarization of cathode of direct methanol fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109935851A true CN109935851A (en) | 2019-06-25 |
| CN109935851B CN109935851B (en) | 2020-12-15 |
Family
ID=66983179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711370618.7A Active CN109935851B (en) | 2017-12-19 | 2017-12-19 | Flow field for reducing mass transfer polarization of cathode of direct methanol fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109935851B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106361A (en) * | 2019-12-23 | 2020-05-05 | 清华大学 | Fuel cell stack, bipolar plate and gas diffusion layer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445878A (en) * | 2003-04-29 | 2003-10-01 | 中国科学院上海微系统与信息技术研究所 | Flow field plate structure used for fuel cell and assembled fuel cell |
| US20060046132A1 (en) * | 2004-08-26 | 2006-03-02 | Goebel Steven G | Fluid flow path for stamped bipolar plate |
| CN103247807A (en) * | 2012-02-08 | 2013-08-14 | 武汉众宇动力系统科技有限公司 | Proton exchange membrane fuel cell based on phase-change heat transfer and bipolar plate thereof |
| CN106602100A (en) * | 2017-01-04 | 2017-04-26 | 沈阳建筑大学 | Novel fuel cell flow field plate |
| CN106997956A (en) * | 2017-04-18 | 2017-08-01 | 上海恒劲动力科技有限公司 | Fluid-flow assembly and the fuel cell pile containing the fluid-flow assembly |
-
2017
- 2017-12-19 CN CN201711370618.7A patent/CN109935851B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445878A (en) * | 2003-04-29 | 2003-10-01 | 中国科学院上海微系统与信息技术研究所 | Flow field plate structure used for fuel cell and assembled fuel cell |
| US20060046132A1 (en) * | 2004-08-26 | 2006-03-02 | Goebel Steven G | Fluid flow path for stamped bipolar plate |
| CN103247807A (en) * | 2012-02-08 | 2013-08-14 | 武汉众宇动力系统科技有限公司 | Proton exchange membrane fuel cell based on phase-change heat transfer and bipolar plate thereof |
| CN106602100A (en) * | 2017-01-04 | 2017-04-26 | 沈阳建筑大学 | Novel fuel cell flow field plate |
| CN106997956A (en) * | 2017-04-18 | 2017-08-01 | 上海恒劲动力科技有限公司 | Fluid-flow assembly and the fuel cell pile containing the fluid-flow assembly |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106361A (en) * | 2019-12-23 | 2020-05-05 | 清华大学 | Fuel cell stack, bipolar plate and gas diffusion layer |
| CN111106361B (en) * | 2019-12-23 | 2021-03-30 | 清华大学 | Fuel cell stack, bipolar plate and gas diffusion layer |
| WO2021128458A1 (en) * | 2019-12-23 | 2021-07-01 | 清华大学 | Fuel cell stack, bipolar plates, and gas diffusion layer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109935851B (en) | 2020-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107658480B (en) | A kind of fuel-cell single-cell and pile of the enhancing of temperature and humidity uniformity | |
| CN101944618B (en) | Tree-structured flow field proton exchange membrane fuel cell bipolar plate | |
| CN108258261A (en) | A kind of variable cross-section fuel cell channel | |
| CN206163611U (en) | Configuration optimization's vanadium redox flow battery guiding device | |
| CN206758557U (en) | Compound carbon felt runner | |
| CN102299343A (en) | Leaf biomimetic structure based bipolar plate for proton exchange membrane fuel cells | |
| CN112786913B (en) | Bipolar plate and fuel cell comprising same | |
| CN110212214A (en) | Bipolar plate flow field structure and bipolar plates in a kind of fuel cell | |
| CN106876762A (en) | A kind of flow battery bipolar plates that interdigital runner is deepened containing broadening | |
| CN109841864B (en) | Proton exchange membrane fuel cell bipolar plate three-dimensional flow field | |
| CN112072119A (en) | Fuel cell gas diffusion layer structure and processing method thereof | |
| CN106997956A (en) | Fluid-flow assembly and the fuel cell pile containing the fluid-flow assembly | |
| CN112909285A (en) | Interdigitated variable cross-section flow channel structure of fuel cell and bipolar plate | |
| CN210006824U (en) | Bipolar plate flow field structure and bipolar plate in fuel cells | |
| CN109950573B (en) | Flow field plate of fuel cell | |
| CN109935851A (en) | A kind of polarized flow field of reduction cathode in direct methanol fuel cells mass transfer | |
| CN104518222B (en) | A kind of flow battery bipolar plates or unipolar plate structure and all-vanadium flow battery | |
| CN202817106U (en) | Novel flow field plate structure of proton exchange membrane fuel cell | |
| CN110690488A (en) | Flow battery | |
| CN217444438U (en) | Gradual change type fuel cell bipolar plate flow field | |
| CN109921056B (en) | Grid flow field | |
| CN208904142U (en) | A kind of mixing flow field dual polar plates of proton exchange membrane fuel cell based on bionic principle | |
| CN111276712B (en) | Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell | |
| CN113224341B (en) | Series flow channel bipolar plate and segmented drainage pile structure | |
| CN109449456A (en) | Bipolar plates, Proton Exchange Membrane Fuel Cells and dual-electrode plates preparation method |
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 |