CN109065908A - A kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss - Google Patents
A kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss Download PDFInfo
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- CN109065908A CN109065908A CN201810847434.3A CN201810847434A CN109065908A CN 109065908 A CN109065908 A CN 109065908A CN 201810847434 A CN201810847434 A CN 201810847434A CN 109065908 A CN109065908 A CN 109065908A
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- runner
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- 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
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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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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The present invention provides a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss, the total runner of cathode inlet and the total runner of cathode outlet including being located at runner both ends, it is equipped with several groups intermediate flow channel along its length between the total runner of the cathode inlet and the total runner of cathode outlet, every group of intermediate flow channel includes several sprues being arranged along total width of flow path direction and the runner being arranged between adjacent sprue, the inlet and outlet of the intermediate flow channel are connected with the total runner of cathode inlet and the total runner of cathode outlet respectively, each sprue is 1/4 arc-shaped along flow channel length direction upper surface close to outlet section, sprue is variable section runner.Fuel battery cathode with proton exchange film flow passage structure provided by the invention is simple, by the way that variable cross-section sprue is arranged, the problem of fuel battery negative pole mass transfer unevenness is effectively relieved, so that oxygen mole concentration value is promoted in runner, the transmission for strengthening oxygen in runner, improves battery performance.
Description
Technical field
The invention belongs to flow channels for proton exchange membrane fuel cells research fields, and in particular to one kind is based on 1/4 round boss
Strengthen the PEMFC cathode flow channels of mass transfer.
Background technique
Proton Exchange Membrane Fuel Cells (PEMFC) is produced electricl energy using hydrogen-oxygen hybrid reaction, has low-temperature cool starting good,
It is pollution-free, many advantages, such as energy conversion efficiency is high, good reliability, it is acknowledged as the preferred manner of the future automobile energy, matter
Proton exchange film fuel cell is the system of a complicated multiphase, is related to thermal conduction study, electrochemistry, hydrodynamics, such as materialogy
Section's knowledge, the mass-transfer performance of battery can reflect the overall performance of battery, and mass transfer is stronger, and electrochemical reaction is stronger, battery electricity
Gesture is higher, and output power is bigger, wherein the principal element for affecting battery mass-transfer performance is the structure of runner, it is anti-as guidance
Answer flow of air direction, it is ensured that reaction gas is evenly distributed to electrode everywhere, participates in electrochemical reaction through electrode diffusion layer and Catalytic Layer,
The water of generation is discharged simultaneously, the flow passage structure developed at present includes dotted, netted, porous body, straight channel, snakelike and interdigitated etc.
Traditional flow field, these runners have no variable section structure, and mass-transfer performance improvement is not obvious, for large area, high current density
The structure of the PEM fuel cell of work, flow field is particularly important, and electrode face product increases, working current density improves
When, unreasonable flow Field Design is often the main reason for causing battery performance to decline.Therefore, the present invention is quasi- by handing over proton
The structure for changing membrane fuel battery cathod runner optimizes to promote the oxygen mole concentration in runner, promotes the biography of battery
Matter performance.
Summary of the invention
In view of the problems of the existing technology, the technical solution that the present invention uses to solve problems of the prior art
It is as follows:
A kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss, the cathode inlet including being located at runner both ends
Total runner and the total runner of cathode outlet, it is characterised in that: along length between the total runner of the cathode inlet and the total runner of cathode outlet
It spends direction and is equipped with several groups intermediate flow channel, every group of intermediate flow channel includes several sprues being arranged along total width of flow path direction and set
Set the runner between adjacent sprue, the inlet and outlet of the intermediate flow channel respectively with the total runner of cathode inlet and cathode outlet
Total runner is connected, and each sprue is 1/4 arc-shaped along flow channel length direction upper surface close to outlet section, so that sprue
Section is close trapezoidal along its length, and sprue is variable section runner.
The sprue width is 0.8-1mm, and length 1.8-2mm, sprue entrance height is 0.85mm, and mainstream is said
Open height is 0.405mm, and from the inlet to the outlet, sprue upper surface is in 1/4 arc-shaped structure of indent.
Before and after the intermediate flow channel inlet and outlet respectively with the total runner of cathode inlet, the total runner outer wall mouth of cathode outlet apart
0.5mm, oxygen fuel is first flowed by the total runner of cathode inlet in fuel cell, rear distribution to corresponding sprue and runner
In, end reaction has permeated extra oxygen and has flowed out through the outlet of sprue and runner, finally passes through the outlet distance of 0.5mm
Outside batteries are discharged by the total runner of cathode outlet.
For the runner between adjacent sprue, runner width is 0.6-0.8mm, length 1.8-2mm, wall thickness
For 0.15mm, runner Sidewall Height does not change along its length, i.e., the cross sectional shape of runner along its length is square
Shape.
Length direction along flow field, the spacing between two adjacent groups intermediate flow channel are 2.5mm, between adjacent sets intermediate flow channel
There is the offset of 0.5mm in the width direction, so that front and back adjacent sets sprue midline position has the offset of 0.5mm, keeps away
It is excessively high to exempt from pressure drop, influences power.
The present invention has the advantage that
Fuel battery cathode with proton exchange film flow passage structure provided by the invention is simple, compared to the variable cross-section knot of conventional runner
Structure is to change the structure size on runner airflow direction, and the invention reside in by the way that 1/4 round boss is arranged in sprue
And cross section of fluid channel being changed, while the presence of 1/4 circular arc boss can be such that resistance to mass tranfer reduces, air velocity improves, and oxygen is dense
Degree is promoted；And the present invention can make runner by making there is staggered offset between winner's runner in flow channel length and width direction
In barometric gradient improved, be unlikely to how high pressure drop is, influence the power of battery, peomote the flowing for generating liquid water
The problem of fuel battery negative pole mass transfer unevenness has been effectively relieved in discharge, the present invention, so that oxygen mole concentration value is promoted in runner,
The transmission for strengthening oxygen in runner, improves battery performance.
Detailed description of the invention
Fig. 1 is Proton Exchange Membrane Fuel Cells novel cathode runner illustraton of model of the present invention；
Fig. 2 is that Proton Exchange Membrane Fuel Cells made from application novel cathode runner of the present invention simplifies three-dimensional model diagram；
Fig. 3 is fuel battery cathode with proton exchange film runner straight channel illustraton of model；
Fig. 4 is that cathode novel flow channel model rubs with straight channel model oxygen on the cathode diffusion layer center line of parallel fluid channels direction
You compare figure at concentration；
Fig. 5 is fuel battery cathode with proton exchange film novel flow channel model compared with straight channel model VA characteristic curve
Figure；
Wherein: 1- sprue, 2- runner, the total runner of 3- cathode inlet, the total runner of 4- cathode outlet, 5- collector plate, 6-
Cathode flow channels, 7- diffusion layer, 8- Catalytic Layer, 9- proton exchange membrane, 10 anode flow channels, 11- airflow direction.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described, such as Fig. 1
Shown, a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss are total including the cathode inlet positioned at runner both ends
Runner 3 and cathode outlet total runner 4 are equipped with several along its length between the total runner 3 of cathode inlet and the total runner 4 of cathode outlet
Group intermediate flow channel, every group of intermediate flow channel include along several sprues 1 of total width of flow path direction setting and setting in adjacent mainstream
Runner 2 between road, the inlet and outlet of intermediate flow channel are connected with the total runner 3 of cathode inlet and the total runner 4 of cathode outlet respectively, often
A sprue 1 is 1/4 arc-shaped along flow channel length direction upper surface close to outlet section, so that section is sprue along its length
Close trapezoidal, sprue 1 is variable section runner.
Sprue width is 0.8-1mm, and length 1.8-2mm, sprue entrance height is 0.85mm, and sprue outlet is high
Degree is 0.405mm, and from the inlet to the outlet, sprue upper surface is in 1/4 arc-shaped structure of indent.
Before and after intermediate flow channel inlet and outlet respectively with the total runner 3 of cathode inlet, the total 4 outer wall mouth of runner of cathode outlet apart
0.5mm, oxygen fuel is first flowed by the total runner of cathode inlet in fuel cell, rear distribution to corresponding sprue and runner
In, end reaction has permeated extra oxygen and has flowed out through the outlet of sprue and runner, finally passes through the outlet distance of 0.5mm
Outside batteries are discharged by the total runner of cathode outlet.
Runner is between adjacent sprue, and runner width is 0.6-0.8mm, length 1.8-2mm, and wall thickness is
0.15mm, runner Sidewall Height do not change along its length, i.e., the cross sectional shape of runner along its length is rectangle.
Length direction along flow field, the spacing between two adjacent groups intermediate flow channel are 2.5mm, between adjacent sets intermediate flow channel
There is the offset of 0.5mm in the width direction, so that front and back adjacent sets sprue midline position has the offset of 0.5mm, keeps away
It is excessively high to exempt from pressure drop, influences power.
In fuel cell simplified model figure as shown in Figures 2 and 3 from top to bottom be respectively collector plate 5 (with a thickness of
1.5mm), cathode flow channels 6 (with a thickness of 0.85mm), diffusion layer 7 (with a thickness of 0.15mm), Catalytic Layer 8 (with a thickness of 0.01mm), matter
Proton exchange 9 (with a thickness of 0.012mm), model lower part anode part are corresponding to it.
The threedimensional model of novel cathode runner shown in Fig. 2 is having a size of length 9mm, width 6.3mm, and one is shared in novel flow channel
The inlet and outlet of three groups of intermediate flow channels, fuel cell cathode flow field front and back intermediate flow channel go out with the total runner of cathode inlet, cathode respectively
Mouthful total sprue width of the runner outer wall port in 0.5mm, every group of intermediate flow channel is 0.8-1mm, length 1.8-2mm,
Height is 0.85mm, and sprue outlet height is 0.405mm.Sprue along its length like trapezoidal, say cross sectional shape by mainstream
Mouthful section upper surface is arranged arc-shaped to recessed 1/4, is effectively improved resistance to mass tranfer problem in runner, the length direction along flow field,
Spacing between the two adjacent groups intermediate flow channel of front and back is 2.5mm, and has the offset of 0.5mm between each sprue, in flow field
The transition zone of 0.5mm is set between runner, is the transitional region that sprue and runner are imported and exported, so that the barometric gradient in runner
Improved.It is runner structure between adjacent sprue, runner width is 0.6-0.8mm, and length is 1.8-2mm, wall thickness
0.15mm, runner structural section shape are consistent, along width of flow path direction, have between main (dividing) runner 0.15mm along runner
The displacement of width direction.Fig. 3 is the illustraton of model that cathode is straight channel, and one shares 3 runners in model runner, runner and bank
Width ratio is all consistent close to 1:1, each battery model Anodic runner moulded dimension, is both configured to 3 straight channels.
The fuel cell of the invention organization plan is flowed into inner flow passage by reaction gas with certain air velocity, due to
Corresponding section is different in sprue and runner, and it is certain that this causes air velocity to have between corresponding runner
Pressure change so that the convection current between runner is reinforced, mass transfer enhancing, at the same in sprue section inclined-plane be it is arc-shaped so that mass transfer
Resistance reduces, and the collective effect of the two strengthens the mass-transfer performance of battery.
Fuel cell mode in the present embodiment is simulated under same operating, and battery operating temperature is set as 90
DEG C, current density 1.6A/cm2, the air of the given humidification of cathode is as reaction gas, and humidification degree is 10%, and charge flow rate is
5.258*10-7Kg/s, the hydrogen of the given humidification of anode is as reaction gas, and humidification degree is 40%, charge flow rate 4.407*10- 8kg/s。
Fig. 4 is that cathode novel flow channel model rubs with straight channel model oxygen on the cathode diffusion layer center line of parallel fluid channels direction
You compare figure at concentration, and current density is derived from high current density 1.6A/cm2Under, as shown in Figure 4, oxygen mole is dense in novel flow channel
Degree is downward trend, this and reaction gas constantly consume related in runner, and oxygen mole concentration is most in novel flow channel structure
It is all higher than in straight channel in number situation, at runner exit, novel flow channel structure oxygen mole concentration occur steep drop be because
The alternation of cross-section at runner exit, and have 0.5mm transitional region close to outlet, there is biggish pressure drop difference in air pressure, so that reaction gas
It is aobvious to flow back to lumen, more reaction gas are gathered in the relatively bigger runner in section, since diffusion layer center line is located at mainstream
Below road, the opposite oxygen mole concentration in runner sprue is less than runner, thus past diffusion layer center line transmitting is anti-
It answers gas concentration to reduce, is learnt by Fig. 2, far from runner exit, cathode novel flow channel structure is than straight channel structure oxygen mole
Concentration improves, mass-transfer performance enhancing.
Fig. 5 is fuel battery cathode with proton exchange film novel flow channel model compared with straight channel model VA characteristic curve
Figure, obtains the corresponding voltage value of battery model under different current densities, as shown in Figure 5, its electricity of cathode novel flow channel model
Pressure value is apparently higher than the model that cathode is straight channel, in high current density 1.6A/cm2When lower, its electricity of cathode novel flow channel model
Pressure value is 0.644V, and it is 0.587V that cathode, which is straight channel model its corresponding voltage value, shows that cathode flow channels are novel stream
Its battery model mass transfer is more preferable when road, and battery performance is more excellent.
Protection scope of the present invention is not limited to the above embodiments, it is clear that those skilled in the art can be to this hair
It is bright to carry out various changes and deformation without departing from scope and spirit of the present invention.If these changes and deformation belong to power of the present invention
In the range of benefit requirement and its equivalent technologies, then including the intent of the present invention also includes these changes and deforms.
Claims (5)
1. a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss, the cathode inlet including being located at runner both ends are total
Runner and the total runner of cathode outlet, it is characterised in that: along length between the total runner of the cathode inlet and the total runner of cathode outlet
Direction is equipped with several groups intermediate flow channel, and every group of intermediate flow channel includes several sprues and setting along the setting of total width of flow path direction
Runner between adjacent sprue, the inlet and outlet of the intermediate flow channel are total with the total runner of cathode inlet and cathode outlet respectively
Runner is connected, and each sprue is 1/4 arc-shaped along flow channel length direction upper surface close to outlet section, and sprue is to become to cut
Surface current road.
2. a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss as described in claim 1, it is characterised in that:
The sprue width is 0.8-1mm, and length 1.8-2mm, sprue entrance height is 0.85mm, and sprue outlet height is
0.405mm。
3. a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss as described in claim 1, it is characterised in that:
Inlet and outlet are respectively with the total runner of cathode inlet, the total runner outer wall mouth of cathode outlet at a distance of 0.5mm, fuel before and after the intermediate flow channel
Oxygen fuel is first flowed by the total runner of cathode inlet in battery, and rear distribution is into corresponding sprue and runner, end reaction
It has permeated extra oxygen to flow out through the outlet of sprue and runner, finally by the outlet distance of 0.5mm by cathode outlet
Outside batteries are discharged in total runner.
4. a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss as described in claim 1, it is characterised in that:
The runner is between adjacent sprue, and runner width is 0.6-0.8mm, length 1.8-2mm, and wall thickness is
0.15mm, runner Sidewall Height do not change along its length.
5. a kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss as described in claim 1, it is characterised in that:
Length direction along flow field, the spacing between two adjacent groups intermediate flow channel are 2.5mm, along width side between adjacent sets intermediate flow channel
To the offset for having 0.5mm.
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| CN201810847434.3A CN109065908A (en) | 2018-07-27 | 2018-07-27 | A kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss |
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| CN201810847434.3A CN109065908A (en) | 2018-07-27 | 2018-07-27 | A kind of PEMFC cathode flow channels for strengthening mass transfer based on 1/4 round boss |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060016399A (en) * | 2004-08-17 | 2006-02-22 | 현대모비스 주식회사 | Bipolar plate of boron fuel cell |
| CN101340001A (en) * | 2007-07-02 | 2009-01-07 | 中强光电股份有限公司 | Runner plate |
| CN101540402A (en) * | 2008-03-22 | 2009-09-23 | 江苏新源动力有限公司 | Air-cooled proton exchange membrane fuel cell plate |
| CN103413956A (en) * | 2013-08-14 | 2013-11-27 | 天津大学 | Proton exchange membrane fuel cell channel |
| CN204189878U (en) * | 2014-09-04 | 2015-03-04 | 华中科技大学 | A kind of cathode of solid oxide fuel cell gas flow field plate |
| CN107611457A (en) * | 2017-08-31 | 2018-01-19 | 上海汽车集团股份有限公司 | A kind of fuel cell and its minus plate |
-
2018
- 2018-07-27 CN CN201810847434.3A patent/CN109065908A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060016399A (en) * | 2004-08-17 | 2006-02-22 | 현대모비스 주식회사 | Bipolar plate of boron fuel cell |
| CN101340001A (en) * | 2007-07-02 | 2009-01-07 | 中强光电股份有限公司 | Runner plate |
| CN101540402A (en) * | 2008-03-22 | 2009-09-23 | 江苏新源动力有限公司 | Air-cooled proton exchange membrane fuel cell plate |
| CN103413956A (en) * | 2013-08-14 | 2013-11-27 | 天津大学 | Proton exchange membrane fuel cell channel |
| CN204189878U (en) * | 2014-09-04 | 2015-03-04 | 华中科技大学 | A kind of cathode of solid oxide fuel cell gas flow field plate |
| CN107611457A (en) * | 2017-08-31 | 2018-01-19 | 上海汽车集团股份有限公司 | A kind of fuel cell and its minus plate |
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Application publication date: 20181221 |
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