CN1953257A - A flow field plate and fuel cell stack containing the same - Google Patents
A flow field plate and fuel cell stack containing the same Download PDFInfo
- Publication number
- CN1953257A CN1953257A CNA2005101092247A CN200510109224A CN1953257A CN 1953257 A CN1953257 A CN 1953257A CN A2005101092247 A CNA2005101092247 A CN A2005101092247A CN 200510109224 A CN200510109224 A CN 200510109224A CN 1953257 A CN1953257 A CN 1953257A
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- Prior art keywords
- flow
- field plate
- centre bore
- fuel cell
- guiding gutter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to a flow field plate and relative fluid accumulator. Wherein, said flow field plate comprises a central hole at the middle of plate, an inlet and an outlet (6, 7) at two positions near the edge of plate; one surface of it comprises divert groove radiated from the central hole (5) to circumstance. Since the plate has radiated divert groove with short length, the reaction agent can be dispersed easily, to avoid dead area, to flow into any part of flow, and the generated material as water, nitrogen, etc, can be discharged on time, to improve the utilization of reaction agent.
Description
Technical field
The present invention relates to fuel cell field, more particularly, relate to a kind of flow-field plate and the fuel cell pack that comprises this flow-field plate.
Background technology
Fuel cell is a kind of chemical energy in fuel and the oxidant to be converted into the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of electric energy, and it has the efficient height, characteristics such as pollutes and noise is low few.Fuel cell can be an individual fuel cells, also can be the fuel battery that is made of a plurality of individual fuel cells.
Individual fuel cells generally comprises proton exchange membrane 1, anode 2, negative electrode 3 and guide plate 4, as shown in Figure 1.
Proton exchange membrane 1 is a kind of permeable air-locked pellicle, and it has the proton conduction effect, can also prevent oxidant and fuel generation mixed explosion.
Anode 2 is a kind of gas-diffusion electrodes, and its backing material generally is made up of the charcoal fiber or the carbon cloth of conduction.Between anode 2 and proton exchange membrane 1, be the catalyticing anode catalyst for reaction.This anode catalyst be generally platinum powder end, platiniferous alloy powder, load on the platinum on the carrier or load on the alloy powder of the platiniferous on the carrier.The alloy of described platiniferous contains platinum and is selected from ruthenium, tin, iridium, osmium, the rhenium one or more.Described carrier is to have the higher specific surface and the carrier of conduction, as active carbon.
The outside of anode 2 and negative electrode 3 is a guide plate 4, and guide plate 4 can be made by graphite material or metal material.
In fuel cell, generally use air or oxygen as oxidant, hydrogen or methyl alcohol, ethanol etc. are as fuel.For example, be fuel with methyl alcohol, air is as oxidant, and following reaction takes place in fuel cell when carrying out electrochemical reaction:
Positive C H
3OH+H
2O → CO
2+ 6H
++ 6e (1)
Anode and negative electrode cause following overall reaction to take place:
CH
3OH+3/2O
2→CO
2+2H
2O (3)
The above-mentioned electrochemical reaction of anode 2 and negative electrode 3 makes between anode 2 and the negative electrode 3 and produces potential difference, and the electronics that anode 2 generates is caught by negative electrode 3 at last by anode 2 outer field guide plate 4 and external current conductor.The proton that anode 2 generates then sees through proton exchange membrane 1 and is directly passed to negative electrode 3, has so just formed electric current.Voltage during the individual fuel cells operate as normal in order to obtain higher voltage and power, often is together in series above-mentioned individual fuel cells in actual applications and forms the form of battery pile between 0.3V～1.0V.
In fuel cell, the structures shape of flow-field plate reactant and the flow regime of product in the flow field, so flow-field plate is one of critical component in the fuel cell.Yet, have " dead band " (i.e. " dead-end " part) on the flow-field plate of using in the prior art, be unfavorable for the diffusion of reactant, cause reactant distribution inhomogeneous easily; And reaction product is as water, nitrogen, CO
2Deng can not in time discharging enrichment on flow-field plate easily.Also in time reaction product being discharged owing to make electrode all obtain sufficient reactant everywhere, is the key that guarantees the normal operation of fuel cell.Therefore if reactant is inhomogeneous in the electrode distributed throughout, will cause inhomogeneous that electrode reacts everywhere, thereby cause that electric current distribution is inhomogeneous, cause the battery local overheating, and then influence battery life and reduce battery performance.If can not in time in time discharge water generation reaction in addition, carrying out along with reaction, the water of accumulating on the negative electrode will cause: the water around (1) catalyst makes and so-called " electrode water logging " phenomenon promptly occurs by the inaccessible catalyst of reactant, directly influences battery performance; (2) increased the resistance to mass tranfer of reactant, reduced the power output of battery by diffusion layer arrival Catalytic Layer; (3) accumulation of water also can make the proton exchange membrane part produce the swelling phenomenon sometimes.
A kind of flow-field plate of fuel cell is disclosed among the patent CN01124227.2, as shown in Figure 2, though this flow-field plate is provided with the guiding gutter of a plurality of extensions parallel to each other, to solve the problem that reactant distribution and reaction product are discharged, but its effect is not fully up to expectations, and problem still exists.
Summary of the invention
The purpose of this invention is to provide and a kind ofly reactant is distributed very equably and reaction product in time can be discharged, thereby effectively solve the flow-field plate of reactant diffusion and reaction product discharge problem.Another object of the present invention provides a kind of fuel cell pack that comprises this flow-field plate.
Flow-field plate provided by the invention comprises the centre bore that is positioned at the flow-field plate center, be positioned at two locational ostiums and tap hole near the flow-field plate edge, and the one side of flow-field plate comprises the connection ostium that distributes around centre bore and the guiding gutter of tap hole.
Fuel cell pack provided by the invention comprises flow-field plate, and described flow-field plate is a flow-field plate provided by the present invention.
Flow-field plate provided by the invention is owing to inflow entrance and the flow export with reactant separates, and has the racetrack guiding gutter that is communicated with ostium and tap hole, therefore make reactant to enter from inflow entrance, be diffused into each zone on the flow-field plate by guiding gutter, be pooled to the flow export place at last, thereby form the concentration gradient of reactant diffusion, be beneficial to the even distribution of reactant.So there is not " dead band " part on the flow-field plate provided by the invention, reactant can be distributed to any one part of flow-field plate equably, and reaction product, as water, nitrogen, CO
2Can discharge in time Deng also, can enrichment on flow-field plate, therefore improved the utilance and the fuel cell performance of reactant.
Description of drawings
Fig. 1 is an individual fuel cells electrode structure schematic diagram;
Fig. 2 is the structural representation of disclosed flow-field plate among the patent CN01124227.2;
Fig. 3 is the structural representation of flow-field plate of the present invention;
Fig. 4 is the structural representation of flow-field plate of the present invention;
Fig. 5 is the structural representation of flow-field plate of the present invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the present invention is further illustrated.
Flow-field plate provided by the invention comprises the centre bore 5 that is positioned at the flow-field plate center, be positioned at two locational ostiums 6 and tap hole 7 near the flow-field plate edge, and under the preferable case, the position of ostium 6 and tap hole 7 is with respect to centre bore 5 symmetries.The one side of flow-field plate comprises around the connection ostium 6 of centre bore 5 distributions and the guiding gutter of tap hole 7.
Wherein, described flow-field plate can adopt graphite or metal material, makes as good materials of electric conductivity such as titanium, stainless steel, gold, silver or copper.Flow-field plate can be a different shape, as circle, ellipse or polygon, is preferably circle, rectangle or ellipse.Centre bore 5 on the flow-field plate, ostium 6 and tap hole 7 can be respectively different shape, as circle, ellipse or polygon, be preferably circle, hexagon or square, and the size of centre bore 5, ostium 6 and tap hole 7 can be decided as required, as long as can satisfy the circulation of oxic gas or fuel.
Under the preferable case, around the centre bore 5 on the described flow-field plate and the neighboring of flow-field plate is respectively arranged with seal washer 8.Seal washer 8 can adopt various elastomeric materials, for example, can be selected from permeability melten gel plastics, rubber, resin, polyurethane, polyester, polyimides, the foamed material one or more.
Under the preferable case, the guiding gutter on the described flow-field plate is camber line shape or broken line shape.Under the preferable case, described guiding gutter is with the distribution of shapes of flow-field plate.Wherein, the ratio of the area of the bottom land area sum of all guiding gutters and whole flow-field plate is between 1/3-4/5 on the flow-field plate, and the ratio of the thickness of the degree of depth of guiding gutter and flow-field plate is between 1/5-1/2 on the flow-field plate.
According to concrete execution mode of the present invention, described flow-field plate is circular.The one side of flow-field plate comprises the connection ostium 6 that distributes around centre bore 5 with the camber line form and the guiding gutter of tap hole 7, this moment guiding gutter along with the round-shaped distribution of flow-field plate, shape resembles a runway that encloses, as shown in Figure 3.Centre bore 5, inflow entrance 6 and flow export 7 are circle.Inflow entrance 6 and flow export 7 are distributed near on two positions with respect to centre bore 5 symmetries at flow-field plate edge along the diameter of circular flow-field plate respectively.Wherein, the bottom land area sum of all guiding gutters is 1/3 with the ratio of the area of whole flow-field plate on the flow-field plate, and the degree of depth of guiding gutter is 1/4 with the ratio of the thickness of flow-field plate on the flow-field plate.
According to concrete execution mode of the present invention, described flow-field plate is a rectangle.The one side of flow-field plate comprises the connection ostium 6 that distributes with the rectangular shape of flow-field plate around centre bore 5 with broken line form and the guiding gutter of tap hole 7, as shown in Figure 4.Centre bore 5, inflow entrance 6 and flow export 7 are circle.Inflow entrance 6 and flow export 7 are distributed near on two positions with respect to centre bore 5 symmetries at flow-field plate edge along the diagonal of rectangular flow field plate respectively.Wherein, the bottom land area sum of all guiding gutters is 3/5 with the ratio of the area of whole flow-field plate on the flow-field plate, and the degree of depth of guiding gutter is 1/2 with the ratio of the thickness of flow-field plate on the flow-field plate.
According to concrete execution mode of the present invention, described flow-field plate is oval.The one side of flow-field plate comprises the connection ostium 6 that distributes with the elliptical shape of flow-field plate around centre bore 5 with the camber line form and the guiding gutter of tap hole 7, as shown in Figure 5.Centre bore 5, inflow entrance 6 and flow export 7 are circle.Inflow entrance 6 and flow export 7 are distributed near on two positions with respect to centre bore 5 symmetries at flow-field plate edge along the major axis of elliptic flow field plate respectively.Wherein, the bottom land area sum of all guiding gutters is 1/2 with the ratio of the area of whole flow-field plate on the flow-field plate, and the degree of depth of guiding gutter is 1/3 with the ratio of the thickness of flow-field plate on the flow-field plate.
According to fuel cell pack provided by the invention, except comprising flow-field plate provided by the present invention, also comprise other necessary assembly of fuel cell pack, the assembly relation between these necessary assemblies and each assembly is conventionally known to one of skill in the art, does not repeat them here.
When in fuel cell pack with described flow-field plate during as oxic gas diffusion runner face, inflow entrance 6 and flow export 7 are respectively applied for the inflow and the outflow of oxic gas.Camber line shape that the oxic gas that enters from inflow entrance 6 will form by flow-field plate or broken line shape around centre bore 5 with the connection ostium 6 of the distribution of shapes of flow-field plate and the guiding gutter of tap hole 7, be diffused into each zone of runner face, and converge to flow export 7 places at last.Because this structure is separated the turnover path of oxic gas, therefore can make the certain concentration gradient of diffuseing to form of oxic gas, thereby help the even distribution of oxic gas, and product and unreacted reactant can be discharged fuel battery inside by tap hole 7, thereby the phenomenon of runner water blockoff and nitrogen enrichment can not take place.Simultaneously, centre bore 5 is used for the circulation of fuel since around centre bore 5 and the neighboring of flow-field plate be respectively arranged with seal washer 8, therefore can completely cut off, in case the block gasification is diffused into anode and fuel directly reacts oxic gas.
When in fuel cell pack with described flow-field plate when the fuel diffusion runner face, inflow entrance 6 and flow export 7 are respectively applied for the inflow and the outflow of fuel.Camber line shape that the fuel that enters from inflow entrance 6 will form by flow-field plate or broken line shape around centre bore 5 with the connection ostium 6 of the distribution of shapes of flow-field plate and the guiding gutter of tap hole 7, be diffused into each zone of runner face, and converge to flow export 7 places at last.Because this structure is separated the turnover path of fuel, therefore can make the certain concentration gradient of diffuseing to form of fuel, thereby help the even distribution of fuel, and product and unreacted reactant can discharge fuel battery insides by tap hole 7, thereby can not react product C O
2The phenomenon of enrichment on runner.Simultaneously, centre bore 5 is used for the circulation of oxic gas since around centre bore 5 and the neighboring of flow-field plate be respectively arranged with seal washer 8, therefore can completely cut off fuel, directly react to negative electrode and oxic gas to prevent fuel diffusion.
Claims (9)
1. flow-field plate, it is characterized in that, described flow-field plate comprises the centre bore (5) that is positioned at the flow-field plate center, two locational ostiums (6) and the tap hole (7) that is positioned at close flow-field plate edge, and the one side of flow-field plate comprises around the connection ostium (6) of centre bore (5) distribution and the guiding gutter of tap hole (7).
2. flow-field plate according to claim 1, wherein, described flow-field plate is circle, rectangle or ellipse.
3. flow-field plate according to claim 1, wherein, the position of described ostium (6) and tap hole (7) is with respect to centre bore (5) symmetry.
4. flow-field plate according to claim 1, wherein, described guiding gutter is with the distribution of shapes of flow-field plate.
5. flow-field plate according to claim 1, wherein, described guiding gutter is camber line shape or broken line shape.
6. flow-field plate according to claim 1, wherein, the ratio of the area of the bottom land area sum of all guiding gutters and whole flow-field plate is between 1/3-4/5 on the described flow-field plate.
7. flow-field plate according to claim 1, wherein, the ratio of the thickness of the degree of depth of guiding gutter and flow-field plate is between 1/5-1/2 on the described flow-field plate.
8. flow-field plate according to claim 1, wherein, the centre bore on the described flow-field plate (5) on every side and the neighboring of flow-field plate be respectively arranged with seal washer (8).
9. a fuel cell pack is characterized in that, this fuel cell pack comprises as any described flow-field plate among the claim 1-8.
Priority Applications (15)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101092247A CN1953257A (en) | 2005-10-19 | 2005-10-19 | A flow field plate and fuel cell stack containing the same |
| JP2008504605A JP5081808B2 (en) | 2005-04-05 | 2006-03-29 | Flow field plate and fuel cell stack using the flow field plate |
| US11/910,830 US20080305382A1 (en) | 2005-04-05 | 2006-03-29 | Flow-Field Plate and Fuel Cell Stack Using the Same |
| AT06722193T ATE443350T1 (en) | 2005-04-05 | 2006-03-29 | FLOW FIELD PLATE AND FUEL CELL STACK WITH IT |
| AT06722192T ATE468622T1 (en) | 2005-04-05 | 2006-03-29 | FLOW FIELD PLATE AND FUEL CELL STACK WITH IT |
| KR1020077024498A KR100887274B1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| KR1020077025665A KR100889105B1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| US11/910,865 US7846608B2 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| JP2008504604A JP5017255B2 (en) | 2005-04-05 | 2006-03-29 | Fuel cell stack |
| PCT/CN2006/000540 WO2006105714A1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| DE602006009240T DE602006009240D1 (en) | 2005-04-05 | 2006-03-29 | |
| EP06722193A EP1872428B1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| PCT/CN2006/000541 WO2006105715A1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| EP06722192A EP1875542B1 (en) | 2005-04-05 | 2006-03-29 | Flow-field plate and fuel cell stack using the same |
| DE602006014388T DE602006014388D1 (en) | 2005-04-05 | 2006-03-29 | FLOW FIELD PLATE AND FUEL CELL STACK WITH IT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101092247A CN1953257A (en) | 2005-10-19 | 2005-10-19 | A flow field plate and fuel cell stack containing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1953257A true CN1953257A (en) | 2007-04-25 |
Family
ID=38059445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005101092247A Pending CN1953257A (en) | 2005-04-05 | 2005-10-19 | A flow field plate and fuel cell stack containing the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1953257A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104150A (en) * | 2011-01-18 | 2011-06-22 | 浙江工业大学 | Bipolar plate with mosquito incense type flow field distribution structure |
| CN110429297A (en) * | 2019-09-05 | 2019-11-08 | 山东建筑大学 | A kind of new fuel cell circle bipolar plates |
| CN114473210A (en) * | 2022-01-27 | 2022-05-13 | 天津力神电池股份有限公司 | Current collecting disc structure of circular lithium ion battery and welding method |
-
2005
- 2005-10-19 CN CNA2005101092247A patent/CN1953257A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104150A (en) * | 2011-01-18 | 2011-06-22 | 浙江工业大学 | Bipolar plate with mosquito incense type flow field distribution structure |
| CN110429297A (en) * | 2019-09-05 | 2019-11-08 | 山东建筑大学 | A kind of new fuel cell circle bipolar plates |
| CN114473210A (en) * | 2022-01-27 | 2022-05-13 | 天津力神电池股份有限公司 | Current collecting disc structure of circular lithium ion battery and welding method |
| CN114473210B (en) * | 2022-01-27 | 2024-09-13 | 天津力神电池股份有限公司 | Current collecting disc structure of circular lithium ion battery and welding method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |