CN2904316Y - Fuel cell flow field plate - Google Patents
Fuel cell flow field plate Download PDFInfo
- Publication number
- CN2904316Y CN2904316Y CNU2006200707102U CN200620070710U CN2904316Y CN 2904316 Y CN2904316 Y CN 2904316Y CN U2006200707102 U CNU2006200707102 U CN U2006200707102U CN 200620070710 U CN200620070710 U CN 200620070710U CN 2904316 Y CN2904316 Y CN 2904316Y
- Authority
- CN
- China
- Prior art keywords
- flow field
- fuel cell
- field plate
- flow
- gas
- 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.)
- Expired - Fee Related
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
Abstract
The utility model discloses a fuel cell flow-field plates, including a flow-field plate body, a flow channel (3), an air inlet (1) and outlet (2) connecting with the flow channel (3). The air inlet (1) is on the upper and bottom of the flow-field plates, while the air outlet (2) is in the middle of the flow-field plates, and each of the air inlet (1) and the outlet (2) is connected by at least a flow channel (3). The fuel cell manufactured with the flow-field plates is stable in performance and has long service life.
Description
Technical Field
The utility model relates to a fuel cell flow field board.
Background
A fuel cell is a power generation device that can directly convert chemical energy into electrical energy. The fuel cell, especially the proton exchange membrane fuel cell, has the advantages of no pollution, low noise, no corrosion, quick start, easy preparation, high power density, high power generation efficiency, long service life and the like in power generation, thereby having wide application prospect in the fields of vehicles, power generation equipment, military, aerospace and the like.
The proton exchange membrane fuel cell consists of a plurality of monocells, wherein each monocell consists of two gas flow field plates and a membrane electrode, and the membrane electrode is clamped between the two gas flow field plates. The electrons generated in the electrochemical reaction process can be led out by conductive objects at two sides of the membrane electrode through an external circuit to form a current loop.
In a pem fuel cell using hydrogen as the fuel and oxygen-containing air as the oxidant, the catalytic electrochemical reaction of the fuel hydrogen in the anode region produces positive hydrogen ions (or protons). The proton exchange membrane assists the migration of positive hydrogen ions from the anode region to the cathode region. In addition, the proton exchange membrane separates the hydrogen-containing fuel gas stream from the oxygen-containing gas stream so that they do not mix with each other to cause explosive reactions.
In the cathode region, oxygen gains electrons on the catalyst surface, forming negative ions, which react with the positive ions transported from the anode region to produce water as a reaction product. In a proton exchange membrane fuel cell using hydrogen and air, the anode reaction and the cathode reaction can be expressed by the following equations:
and (3) anode reaction:
and (3) cathode reaction:
in a typical pem fuel cell, the membrane electrode is typically placed between two electrically conductive flow field plates, and the surface of each flow field plate in contact with the membrane electrode is die-cast, stamped, or mechanically milled to form at least one flow channel. These flow field plates may be metallic or graphite materials. The flow field plate is used as a current collector plate and mechanical supports at two sides of the membrane electrode, and the flow channel can be used as a channel for fuel and oxidant to enter the surfaces of the anode and the cathode and as a channel for taking away water generated in the operation process of the fuel cell.
In order to make the proton exchange membrane fuel cell in a high-performance working state, the performance of each point of the membrane electrode must be kept consistent all the time. Due to the inconsistency of gas distribution and the inconsistency of the heat dissipation conditions of all points of the membrane electrode, the actual performance of all points of the membrane electrode is greatly different, and in severe cases, the middle part of the membrane electrode can be locally overheated, even burn through a proton exchange membrane, so that a fuel cell pack fails.
In order to maintain the consistency of the performance of each point of the membrane electrode, there are two main approaches:
1. thinning a flow channel: the width of the flow channel is thinned, the number of the flow channels is increased, and the gas distribution is as uniform as possible;
2. designing a flow field: a snake-shaped flow field is adopted, so that the gas distribution is as uniform as possible;
however, both of the above-mentionedtechnologies have a key difficulty that the gas inlet and the gas outlet are respectively located at both ends of the flow field plate, and the concentration of the reactant is gradually reduced in the process that the gas inlet end reaches the outlet end along the flow channel, the reaction near the outlet end is always the least, and the temperature at the outlet end is the lowest because the outlet is near the edge of the flow field plate and the heat dissipation condition is good, and meanwhile, because the water generated by the reaction is transported along the flow channel all the time, the gas state is easily changed into the liquid state when reaching the outlet end, thereby blocking the outlet and seriously affecting the cell performance.
Disclosure of Invention
The utility model provides a fuel cell flow field plate, the fuel cell stable performance and the life-span that make with this flow field plate are longer.
The utility model discloses can realize through following technical scheme: a flow field plate of a fuel cell comprises a flow field plate body, flow channels arranged on the flow field plate body, and a gas inlet and a gas outlet which are communicated with the flow channels, wherein the two ends of the flow field plate are respectively provided with the gas inlet, the middle part of the flow field plate is provided with the gas outlet, and each gas inlet is communicated with the gas outlet through at least one flow channel.
In the utility model, the two gas inlets can be positioned at the same side of the two ends of the flow field plate or at the opposite side of the two ends of the flow field plate; the gas outlet is located in the central portion of the flow field plate.
The utility model discloses owing to adopted above technical scheme, make the concentration of fuel hydrogen or oxidant (oxygen, air) more and more low in the direction from the flow field board outside to central point and put, concentration is the highest in the outside, and concentration at central point puts is minimum, and it is less more close to central point and put the reaction heat more in fact to make on the membrane electrode, has reduced the heat dissipation requirement of membrane electrode each point to make fuel cell's performance keep at the preferred state, prolonged the life of battery.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
Detailed Description
Referring to fig. 1, a flow field plate of a fuel cell is composed of a flow field plate body, a gas inlet 1, a gas outlet 2, and a flow channel 3 provided on the flow field plate body. The left upper end of the flow field plate and the right lower end of the flow field plate are respectively provided with a gas inlet 1, the symmetrical center of the flow field plate is provided with a gas outlet 2, and each gas inlet 1 is communicated with the gas outlet 2 through at least one flow channel 3.
The two gas inlets 1 can be arranged on the left side of the upper and lower ends of the flow field plate, and can also be arranged on the right side at the same time, and are not limited to the positions shown in fig. 1. The gas outlet 2 can also be positioned at the left side or the right side of the middle part of the flow field plate, but the effect is best at the central position,so that the heat dissipation requirements of all points of the membrane electrode can be met, and the performance of the fuel cell can be kept in a better state.
Claims (3)
1. The utility model provides a fuel cell flow field board, includes the flow field board body, establishes runner (3) on this flow field board body, with gas inlet (1) and gas outlet (2) of this runner (3) intercommunication, its characterized in that the both ends of flow field board all are equipped with gas inlet (1), the middle part of flow field board is equipped with gas outlet (2), each gas inlet (1) is linked together with gas outlet (2) through at least one runner (3).
2. A fuel cell flow field plate according to claim 1, characterised in that the two gas inlets (1) are located on the same or opposite sides of the two ends of the flow field plate.
3. A fuel cell flow field plate according to claim 1 or 2, characterised in that the gas outlet (2) is located in a central portion of the flow field plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200707102U CN2904316Y (en) | 2006-03-28 | 2006-03-28 | Fuel cell flow field plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200707102U CN2904316Y (en) | 2006-03-28 | 2006-03-28 | Fuel cell flow field plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2904316Y true CN2904316Y (en) | 2007-05-23 |
Family
ID=38079729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200707102U Expired - Fee Related CN2904316Y (en) | 2006-03-28 | 2006-03-28 | Fuel cell flow field plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2904316Y (en) |
-
2006
- 2006-03-28 CN CNU2006200707102U patent/CN2904316Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070523 |