CN101958425A - Fuel cell stack with internal single cells in different stoichiometric proportions - Google Patents
Fuel cell stack with internal single cells in different stoichiometric proportions Download PDFInfo
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- CN101958425A CN101958425A CN2009100551639A CN200910055163A CN101958425A CN 101958425 A CN101958425 A CN 101958425A CN 2009100551639 A CN2009100551639 A CN 2009100551639A CN 200910055163 A CN200910055163 A CN 200910055163A CN 101958425 A CN101958425 A CN 101958425A
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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 fuel cell stack with internal single cells in different stoichiometric proportions, which consists of a plurality of fuel cell units in different anode stoichiometric proportions, wherein each group of fuel cell units comprises a plurality of single fuel cells. Compared with the prior art, the fuel cell stack has the advantages of hydrogen waste reduction, high efficiency and the like.
Description
Technical field
The present invention relates to fuel cell, have the fuel cell pack of different chemical metering ratio between especially a kind of inner monolithic battery.
Background technology
Fuel cell can produce water in running, water management is an importance of fuel cell, water can influence fuel cell membranes too on a small quantity and lead the proton ability, dilutional hyponatremia can cause fuel cell electrode to be flooded, aqueous water even obstruction runner, cause inside battery gas under-supply, influence the performance of battery performance, can cause the decay of the irrecoverable property of battery performance when serious.
When metering was fuel cell operation than coefficient, the external world offered the ratio of the gas flow of fuel cell with the amount of the required participation chemical reaction gas of battery.For the battery electrode anode-side, if dilutional hyponatremia stops up the supply of runner meeting fuel gas, the fuel gas metering is generally about 1.1 than coefficient, and the metering of air cathode side can have bigger excursion than coefficient, does not wait from 1.6-120.Increase the blower fan supply of air, the metering that can improve air cathode side fuel cell is than coefficient, and therefore, fuel battery negative pole side draining ratio is easier to.For the draining of anode of fuel cell side generally is to discharge water in the runner by the linear velocity that changes hydrogen in flow channel length and the runner, but along with the increase of flow channel length.The water of fuel cell monolithic electrode anode-side hydrogen outlet obviously increases, and crooked simultaneously runner also influences the discharge of water.We can adopt the mode that improves monolithic battery stoichiometric proportion coefficient to discharge the interior water of battery.Improve the hydrogen stoichiometric proportion, mean system's added hydrogen circulating pump or raising fuel cell row's hydrogen time, the former has increased the complexity of the system of fuel cell, and the latter has reduced the fuel utilization ratio of fuel cell.
If for the fuel cell pack inner structure is the monolithic battery of unified structure, there be not hydrogen pump to increase in the fuel cell pack of fuel measurement than coefficient, the draining of anode side fuel cell is undertaken by batch (-type) row hydrogen.Often there is easy ponding in the some of them monolithic battery in the monolithic battery anode-side, for the water that makes in the battery pile several batteries is wherein discharged, must increase row's hydrogen frequency and row's hydrogen time of integral battery door heap, making did not so need to arrange the process that the monolithic battery of hydrogen has also participated in row's hydrogen originally, caused a large amount of hydrogen wastes.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of the minimizing between the inside monolithic battery that hydrogen waste, reduced cost, efficient is high to have the fuel cell pack that different chemical measures ratio in order to overcome the defective that above-mentioned prior art exists.
Purpose of the present invention can be achieved through the following technical solutions: the fuel cell pack that has different chemical metering ratio between a kind of inner monolithic battery, it is characterized in that, this fuel cell pack is made up of than different cell of fuel cell many groups anode stoichiometry, and each is organized cell of fuel cell and comprises a plurality of fuel cell monolithics with anode and cathode.
The watt level of described cell of fuel cell fuel cell heap requires to be provided with the 2-10 group, and each is organized cell of fuel cell and comprises 1-10 the fuel cell monolithic with anode and cathode.
The anode stoichiometry of same group of cell of fuel cell is than approaching in the described fuel cell pack, and the anode-side runner of fuel cell monolithic is identical.
Described anode stoichiometry is than being 1-2.
When the anode stoichiometry ratio of described cell of fuel cell was 1-1.2, the anode-side runner of cell of fuel cell was than the dark 0.1-2mm of the degree of depth of the anode-side runner of other cell of fuel cell.
The fuel gas circulating direction of two adjacent groups cell of fuel cell is opposite in the described fuel cell pack.
Compared with prior art, whole fuel cell monolithics with anode and cathode is divided into the anode metering than different several parts in the whole fuel cell of the present invention, for with the wherein monolithic fuel cell in the part, its anode chemical dosage ratio is approaching, for the approaching fuel cell of stoichiometric proportion in the battery pile, its flow passage structure is consistent, a part of anode wherein measures than coefficient near 1, for near 1 fuel battery part, its anode-side runner design can be different from other parts.Monolithic battery has different stoichiometric proportions in the fuel cell, most of monolithic battery in the fuel cell is had than higher stoichiometric proportion coefficient, and make several wherein specific fuel cell stoichiometric proportions near 1, when like this fuel cell being arranged hydrogen draining processing, the fuel cell of several specific easy ponding is concentrated in together, has greatly reduced the waste of fuel cell hydrogen fuel.
Description of drawings
Fig. 1 is fuel cell pack of the present invention and the mobile internal structure schematic diagram of fuel gas.
Among the figure: 1-fuel gas inlets, 2-fuel main aperture pipeline, 3-a group fuel gas flow direction, 4-b group fuel gas flow direction, 5-c group fuel gas flow direction, 6-fuel are discharged main aperture pipeline, the outlet of 7-fuel gas, 8-fuel cell end plate, 9-fuel cell monolithic.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment 1
Be illustrated in figure 1 as fuel cell pack and the mobile internal structure schematic diagram of fuel gas of a 200W, have 10 fuel cell monolithics in this fuel cell with anode and cathode, be divided into 3 groups of cell of fuel cell, wherein preceding 5 are a group cell of fuel cell, middle 3 are b group cell of fuel cell, and 2 of back are c group cell of fuel cell.
The fuel gas hydrogen of fuel cell pack enters fuel cell end plate 8 from fuel gas inlets 1, in fuel main aperture pipeline 2, flow, flow through the anode-side of a group cell of fuel cell from top to bottom, after being flowed to the main aperture pipeline in a group cell of fuel cell exit then, excessive hydrogen from the bottom to top, the fuel cell b that flows through group cell of fuel cell anode-side, after being flowed to the main aperture pipeline in exit, b group cell of fuel cell upper end again, the fuel cell c that flows through group cell of fuel cell anode-side, at last, discharge main aperture pipeline 6 by the fuel in c group cell of fuel cell exit and drain into fuel cell end plate 8, discharge fuel cell pack through fuel gas outlet 7.
The fuel hydrogen total amount that enters fuel cell pack from fuel gas inlets 1 is the amounts of hydrogen that whole fuel cell pack needs, if the hydrogen of every fuel cell monolithic 9 needs is 1 mole, the hydrogen of 10 fuel cell monolithic needs is more than or equal to 10 moles so, after falling 5 moles of hydrogen through a group cell of fuel cell reaction consumes, remain 5 mol of hydrogen and enter b group cell of fuel cell, continue reaction consumes and fall 3 moles of hydrogen, in c group cell of fuel cell reaction consumes 2 mol of hydrogen, excess hydrogen is discharged from fuel gas outlet 7 at last.
For the metering of the anode-side hydrogen of a group cell of fuel cell than coefficient, gas for the reaction of a group fuel cell monolithic, flow through the hydrogen gas mole/id reaction demand mole of fuel cell monolithic=(5+3+2)/5=2, under the condition of considering fuel cell gas intermittent discharge hydrogen, the metering of a group cell of fuel cell anode should be greater than 2 than coefficient.
For the metering of the anode-side hydrogen of b group cell of fuel cell than coefficient, gas for the reaction of b group fuel cell monolithic, flow through the hydrogen gas/id reaction demand of fuel cell monolithic=(3+2)/3=1.6, under the condition of considering fuel cell gas intermittent discharge hydrogen, the metering of b section anode of fuel cell should be greater than 1.6 than coefficient.
For the metering of the anode-side hydrogen of c group cell of fuel cell than coefficient, gas for the reaction of c group fuel cell monolithic, flow through the hydrogen gas/id reaction demand=2/2=1.0 of fuel cell monolithic, under the condition of considering fuel cell gas intermittent discharge hydrogen, the metering of c section anode of fuel cell should be greater than 1.0 than coefficient.
In the metering of a group anode-side hydrogen than coefficient greater than 2, the metering of b group anode-side hydrogen than coefficient greater than under 1.6 the condition, anode of fuel cell a, the b group is not easy ponding, so this part battery is stable.In the c of fuel cell group, the anode of fuel cell metering near 1.0, adds that the fuel hydrogen air-flow is through a than coefficient, b group back increases hydrogen humidity, therefore ponding easily in c group anode, we can adopt methods such as increasing c group flow channel depth, improve the drainability of c section.
In the fuel cell pack of routine, we adopt method and this process discontinuous row hydrogen of intermittently arranging hydrogen to compare, the time of row's hydrogen is identical with frequency, because the monocell sheet number that the hydrogen discharge in this process is flowed through obviously reduces, row's hydrogen amount obviously reduces, and hydrogen discharge reduces to 2% from original 5%.
The fuel cell pack that has different chemical metering ratio between a kind of inner monolithic battery, this fuel cell pack is made up of than different cell of fuel cell 4 groups of anode stoichiometries, first group of cell of fuel cell near the fuel cell hydrogen exit comprises 10 fuel cell monolithics with anode and cathode, the back sets gradually 4 groups of cell of fuel cell of second group of cell of fuel cell to the, has the fuel cell monolithic respectively: 6,2,2.
The anode stoichiometry of same group of cell of fuel cell is than identical or close in the above-mentioned fuel cell pack, and the anode-side runner of the fuel cell monolithic of same group of cell of fuel cell is identical, and the fuel gas circulating direction of two adjacent groups cell of fuel cell is opposite.Described anode stoichiometry is than being 1-2, when wherein the anode stoichiometry of the 4th group of cell of fuel cell ratio is for 1-1.2, its anode-side runner is different from the anode-side runner of other cell of fuel cell, and its anode-side runner is than the dark 2mm of the degree of depth of the anode-side runner of other cell of fuel cell.
The fuel cell pack that has different chemical metering ratio between a kind of inner monolithic battery, this fuel cell pack is made up of than different cell of fuel cell 2 groups of anode stoichiometries, first group of cell of fuel cell near the fuel cell hydrogen exit comprises 10 fuel cell monolithics with anode and cathode, and the second group of cell of fuel cell in back has 5 fuel cell monolithics.
The anode stoichiometry of same group of cell of fuel cell is than identical or close in the above-mentioned fuel cell pack, and the anode-side runner of the fuel cell monolithic of same group of cell of fuel cell is identical, and the fuel gas circulating direction of two adjacent groups cell of fuel cell is opposite.The anode stoichiometry of first group of cell of fuel cell is than being 1.5-1.8, the anode stoichiometry of second group of cell of fuel cell is than being 1-1.2, the anode-side runner of second group of cell of fuel cell is different from the anode-side runner of first group of cell of fuel cell, and its anode-side runner is than the dark 0.1mm of the degree of depth of the anode-side runner of first group of cell of fuel cell.
Claims (6)
1. has the fuel cell pack that different chemical measures ratio between an inner monolithic battery, it is characterized in that, this fuel cell pack is made up of than different cell of fuel cell many groups anode stoichiometry, and each is organized cell of fuel cell and comprises a plurality of fuel cell monolithics with anode and cathode.
2. the fuel cell pack that has different chemical metering ratio between a kind of inner monolithic battery according to claim 1, it is characterized in that, the watt level of described cell of fuel cell fuel cell heap requires to be provided with the 2-10 group, and each is organized cell of fuel cell and comprises 1-10 the fuel cell monolithic with anode and cathode.
3. have the fuel cell pack of different chemical metering ratio between a kind of inner monolithic battery according to claim 1, it is characterized in that the anode-side runner of same group of cell of fuel cell is identical in the described fuel cell pack.
4. have the fuel cell pack of different chemical metering ratio between a kind of inner monolithic battery according to claim 1, it is characterized in that, described anode stoichiometry is than being 1-2.
5. the fuel cell pack that has different chemical metering ratio between a kind of inner monolithic battery according to claim 1, it is characterized in that, when the anode stoichiometry ratio of described cell of fuel cell was 1-1.2, the anode-side runner of cell of fuel cell was than the dark 0.1-2mm of the degree of depth of the anode-side runner of other cell of fuel cell.
6. have the fuel cell pack of different chemical metering ratio between a kind of inner monolithic battery according to claim 1, it is characterized in that the fuel gas circulating direction of two adjacent groups cell of fuel cell is opposite in the described fuel cell pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100551639A CN101958425A (en) | 2009-07-21 | 2009-07-21 | Fuel cell stack with internal single cells in different stoichiometric proportions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100551639A CN101958425A (en) | 2009-07-21 | 2009-07-21 | Fuel cell stack with internal single cells in different stoichiometric proportions |
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| CN101958425A true CN101958425A (en) | 2011-01-26 |
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| CN2009100551639A Pending CN101958425A (en) | 2009-07-21 | 2009-07-21 | Fuel cell stack with internal single cells in different stoichiometric proportions |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010036566A1 (en) * | 1996-11-13 | 2001-11-01 | Stichting Energieonderzoek Centrum Neder, British Gas Plc. | Reactant flow arrangement of a power system of several internal reforming fuel cell stacks |
| CN1497756A (en) * | 2002-10-16 | 2004-05-19 | 松下电器产业株式会社 | Fuel cell and its operating method |
| CN1971995A (en) * | 2005-11-03 | 2007-05-30 | 通用汽车环球科技动作公司 | Cascaded stack with gas flow recycle in the first stage |
-
2009
- 2009-07-21 CN CN2009100551639A patent/CN101958425A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010036566A1 (en) * | 1996-11-13 | 2001-11-01 | Stichting Energieonderzoek Centrum Neder, British Gas Plc. | Reactant flow arrangement of a power system of several internal reforming fuel cell stacks |
| CN1497756A (en) * | 2002-10-16 | 2004-05-19 | 松下电器产业株式会社 | Fuel cell and its operating method |
| CN1971995A (en) * | 2005-11-03 | 2007-05-30 | 通用汽车环球科技动作公司 | Cascaded stack with gas flow recycle in the first stage |
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Application publication date: 20110126 |