CN216850001U - Air cooling integrated membrane electrode structure of fuel cell - Google Patents
Air cooling integrated membrane electrode structure of fuel cell Download PDFInfo
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- CN216850001U CN216850001U CN202123085161.XU CN202123085161U CN216850001U CN 216850001 U CN216850001 U CN 216850001U CN 202123085161 U CN202123085161 U CN 202123085161U CN 216850001 U CN216850001 U CN 216850001U
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Abstract
The utility model discloses a fuel cell air cooling integration membrane electrode structure. The runner structure make full use of runner ridge structure makes its cavity form extra runner in this application to form the sharing runner with original runner groove dislocation and increased the gaseous membrane electrode consumption that can more rapidly under the same condition of gas runner space, make the whole gas pressure distribution of membrane electrode evenly promote power density and durability, especially the effect is more obvious under heavy current density. Meanwhile, the gas consumption during the operation of the membrane electrode causes the gas flow speed at the runner groove to be faster than that at the runner ridge, and relative negative pressure is formed at the runner groove, so that the water inside the air-cooled reactor is not easy to be taken away by air flow, and the problem of water shortage frequently caused by the operation of the electric pile in the air-cooled reactor direct-current runner technology is solved. The relative negative pressure and the gas-gas pressure drop can be adjusted by the dislocation proportion and the width proportion of the adjacent discharge channel grooves and ridges to find the optimal matching suitable for different size galvanic piles and different application scenes.
Description
Technical Field
The utility model relates to a fuel cell technical field especially relates to a fuel cell air cooling integration membrane electrode structure.
Background
The proton exchange membrane fuel cell is a device which takes hydrogen as fuel and converts chemical energy in the fuel into electric energy through oxidation-reduction reaction with oxygen in air. A typical pem fuel cell structure is formed by repeatedly stacking bipolar plates (anode and cathode plates), membrane electrodes, and some sealing members to form a stack containing a large number of unit cells.
The air-cooled proton exchange membrane fuel cell uses air as a cooling medium, wherein the air is used for providing oxygen for reaction and cooling.
The assembly of the common air cooling stack needs to assemble the sealing glue line, the flow channel layer, the sealing glue line and the membrane electrode assembly at one time, the four-layer structure is one unit, dozens of hundreds of units are assembled into one galvanic pile, the assembly process is complicated and long in time consumption, and the product consistency quality is not high.
For example, application publication No. CN105932314A discloses a fuel cell cathode plate sealing device, a fuel cell, and a fuel cell stack. The sealing device comprises a cathode plate and a sealing component. The cathode plate is made of a porous material, and a first structure for mounting a sealing member is provided thereon. The sealing member is internally provided with a longitudinal through-hole serving as a fuel main flow passage of the fuel cell. The sealing member serves to seal the fuel main flow passage and to seal the contact between the cathode plate and the anode plate positioned above the cathode plate. The lower part of the sealing component is provided with a second structure matched with the first structure, and the upper part of the sealing component is provided with a transverse groove, so that fuel flowing through the main fuel flow channel can be distributed into the micro fuel flow channel contained in the upper anode plate
For another example, the invention application with publication number CN112436163A discloses a fuel cell metal bipolar plate and a cathode closed air-cooled stack, which includes an anode plate, an air-cooled plate, and a cathode plate connected in sequence, and further includes a sealing ring for preventing gas leakage, wherein a fuel gas flow channel is arranged on one side of the anode plate away from the air-cooled plate, and the fuel gas flow channel is arranged along the length direction of the metal bipolar plate; a reaction air flow channel is arranged on one side of the negative plate, which is far away from the air cooling plate, and the reaction air flow channel is arranged along the length direction of the metal bipolar plate; and cooling air flow channels are respectively arranged on two sides of the air cooling plate and are arranged along the width direction of the metal bipolar plate.
The aforementioned assembly problems exist in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a membrane electrode structure integrating air cooling of fuel cells, aiming at the defects existing in the prior art.
An air-cooled integrated membrane electrode structure of a fuel cell comprises a membrane electrode assembly, and an air flow channel layer and a hydrogen flow channel layer which are respectively positioned at two sides of the membrane electrode assembly, wherein the air flow channel layer is provided with an air flow channel, the hydrogen flow channel layer is provided with a hydrogen flow channel, the hydrogen flow channel is arranged along the long axis direction of the membrane electrode assembly, the air flow channel is arranged along the short axis direction of the membrane electrode assembly,
the hydrogen flow channel layer comprises a hydrogen flow channel forming plate, the hydrogen flow channel forming plate is divided into a plurality of sections according to the hydrogen flow direction, each section of structure sequentially protrudes towards two surfaces of the hydrogen flow channel forming plate according to the direction vertical to the hydrogen flow direction, wherein one side of the hydrogen flow channel forming plate, which faces towards the membrane electrode assembly, protrudes to form a hydrogen flow channel ridge, one side of the hydrogen flow channel forming plate, which faces away from the membrane electrode assembly, protrudes to form a hydrogen flow channel groove, and the hydrogen flow channel grooves between two adjacent sections are arranged in a staggered manner; wherein, a flow channel bottom plate is arranged at one side far away from the membrane electrode assembly, a hydrogen flow channel forming plate is clamped between the membrane electrode assembly and the flow channel bottom plate to form a hydrogen flow channel formed by connecting hydrogen flow channel grooves, and the periphery of the hydrogen flow channel forming plate is also provided with a circle of hydrogen side sealing rubber blocks;
the air flow channel layer comprises an air flow channel forming plate, the air flow channel forming plate is divided into a plurality of sections according to the air flow direction, each section of structure sequentially protrudes towards two sides of the air flow channel forming plate according to the direction perpendicular to the air flow direction, wherein one side of the air flow channel layer protrudes towards the membrane electrode assembly to form an air flow channel ridge, one side of the air flow channel layer protrudes away from the membrane electrode assembly to form an air flow channel groove, and the air flow channel grooves between two adjacent sections are arranged in a staggered mode; the membrane electrode assembly and a flow channel bottom plate of an adjacent fuel cell air-cooling integrated membrane electrode structure are clamped by an air flow channel forming plate to form an air flow channel formed by connecting air flow channel grooves when being stacked, and air side sealing rubber blocks are respectively arranged on two sides of the air flow channel forming plate, which are vertical to the air flow direction;
and hydrogen gas inlet/exhaust channels which are communicated with each other are reserved on the flow channel bottom plate, the air side sealing rubber block and between the inlet end and the outlet end of the hydrogen gas flow channel and the hydrogen side sealing rubber block.
Preferably, the width of the hydrogen runner groove and the air runner groove is 0.2-2 mm, and the depth of the hydrogen runner groove and the air runner groove is 0.2-2 mm.
Preferably, the thickness of the air flow channel forming plate is 0.1-0.5 mm; the thickness of the hydrogen flow channel forming plate is 0.5 to 1 mm.
Preferably, the staggered distance of the hydrogen flow channel grooves between two adjacent sections on the hydrogen flow channel forming plate is 50-90% of the width of a single hydrogen flow channel groove; the staggered distance of the air flow channel grooves between two adjacent sections on the air flow channel forming plate is 50-90% of the width of a single air flow channel groove.
Preferably, the width of each section of the hydrogen flow channel forming plate in the hydrogen flow direction is 5-20 mm; the width of each section of the air flow channel forming plate in the air flowing direction is 3-15 mm.
Preferably, the hydrogen flow passage forming plate and the air flow passage forming plate are made of stainless steel, and the surfaces of the hydrogen flow passage forming plate and the air flow passage forming plate are pre-plated or post-treated with a surface coating which is corrosion-resistant and/or reduces contact resistance.
Preferably, the cross sections of the hydrogen runner groove and the air runner groove are both square, and two sides of the groove bottom are provided with fillets.
Preferably, an empty side gasket is arranged between the air flow channel layer and the membrane electrode assembly, and the empty side gasket is provided with a first avoidance hole for avoiding the air flow channel and second avoidance holes which are positioned at two ends and used for forming a hydrogen gas inlet/exhaust channel. The arrangement of the empty side gasket is beneficial to keeping the position between the air flow channel layer and the membrane electrode assembly aligned, and the long-term use of the membrane electrode assembly can not cause the occurrence of staggered layers and influence on the durability of the cell.
The utility model discloses fuel cell air cooling integration membrane electrode structure is when preparing, hydrogen gas flow channel forms board and air flow channel and forms board and form hydrogen gas flow channel groove or air flow channel groove by the coiling material through the punching press of fin machine, cuts or punches again hydrogen gas flow channel forms board or air flow channel and forms the board. During assembly, the hydrogen flow channel forming plate is placed on the flow channel bottom plate, and the hydrogen side sealing rubber block is bonded on the flow channel bottom plate in a glue injection or sealing rubber block mode; then bonding the membrane electrode assembly on the hydrogen side sealing rubber block; and then placing the air flow channel forming plate on the membrane electrode assembly, and adhering and fixing the air flow channel forming plate by using an air side sealing rubber block through glue injection or a sticky rubber block.
The hydrogen flow channel forming plate and the air flow channel forming plate have specific structural characteristics, so that the hydrogen flow channel forming plate and the air flow channel forming plate do not need to be integrally formed, and can be formed in an area and an area, so that the hydrogen flow channel forming plate can be firstly formed by punching on a coiled material and then cut or blanked, the pressure used by punching is greatly reduced, a fin machine can be used for punching, and the equipment and the die cost are greatly reduced.
The runner structure make full use of runner ridge structure makes its cavity form extra runner in this application to form the sharing runner with original runner groove dislocation and increased the gaseous membrane electrode consumption that can more rapidly under the same condition of gas runner space, make the whole gas pressure distribution of membrane electrode evenly promote power density and durability, especially the effect is more obvious under heavy current density. Meanwhile, the gas consumption during the operation of the membrane electrode causes the gas flow speed at the runner groove to be faster than that at the runner ridge, and relative negative pressure is formed at the runner groove, so that the water inside the air-cooled reactor is not easy to be taken away by air flow, and the problem of water shortage frequently caused by the operation of the electric pile in the air-cooled reactor direct-current runner technology is solved. The relative negative pressure and the gas-gas pressure drop can be adjusted by the dislocation proportion and the width proportion of the adjacent discharge channel grooves and ridges to find the optimal matching suitable for different size galvanic piles and different application scenes.
Drawings
Fig. 1 is a schematic perspective view of the air-cooled integrated membrane electrode structure of the fuel cell of the present invention.
Fig. 2 is a schematic view of the overlooking structure of the air-cooling integrated membrane electrode structure of the fuel cell of the present invention.
Fig. 3 is a schematic perspective view of another view angle of the air-cooled integrated membrane electrode structure of the fuel cell of the present invention.
Fig. 4 is a schematic side view of the fuel cell air-cooling integrated membrane electrode structure of the present invention.
Fig. 5 is an exploded view of the air-cooled integrated membrane electrode structure of the fuel cell of the present invention.
Fig. 6 is a schematic perspective view of the air flow passage forming plate.
Fig. 7 is a side view schematically showing the structure of the air flow passage forming plate.
Fig. 8 is a schematic perspective view of the hydrogen flow channel forming plate and the flow channel bottom plate.
Fig. 9 is a schematic side view of the hydrogen flow channel forming plate and the flow channel bottom plate.
Detailed Description
As shown in fig. 1 to 9, an air-cooled integrated membrane electrode structure for a fuel cell includes a membrane electrode assembly 1, and an air flow channel layer 3 and a hydrogen flow channel layer 2 respectively located at two sides of the membrane electrode assembly 1, where the air flow channel layer 3 is provided with an air flow channel, the hydrogen flow channel layer 2 is provided with a hydrogen flow channel, the hydrogen flow channel is arranged along a long axis direction of the membrane electrode assembly 1, and the air flow channel is arranged along a short axis direction of the membrane electrode assembly 1.
The hydrogen flow channel layer 2 comprises a hydrogen flow channel forming plate 21, the hydrogen flow channel forming plate 21 is divided into a plurality of sections according to the hydrogen flow direction, each section of structure sequentially protrudes towards two sides of the hydrogen flow channel forming plate 21 according to the direction vertical to the hydrogen flow direction, wherein one side of the hydrogen flow channel forming plate, which faces the membrane electrode assembly 1, protrudes to form a hydrogen flow channel ridge 211, one side of the hydrogen flow channel forming plate, which faces away from the membrane electrode assembly 1, protrudes to form a hydrogen flow channel groove 212, and the hydrogen flow channel grooves 212 between the two adjacent sections are arranged in a staggered manner; wherein, a flow channel bottom plate 22 is arranged at one side far away from the membrane electrode assembly 1, a hydrogen flow channel forming plate 21 is clamped between the membrane electrode assembly 1 and the flow channel bottom plate 22 to form a hydrogen flow channel formed by connecting hydrogen flow channel grooves 211, and a circle of hydrogen side sealing rubber block 23 is arranged at the periphery of the hydrogen flow channel forming plate 21.
The air flow channel layer 3 comprises an air flow channel forming plate 31, the air flow channel forming plate 31 is divided into a plurality of sections according to the air flow direction, each section of structure sequentially protrudes towards two sides of the air flow channel forming plate 31 according to the direction perpendicular to the air flow direction, wherein one side of each section of structure protrudes towards the membrane electrode assembly 1 to form an air flow channel ridge 311, one side of each section of structure protrudes away from the membrane electrode assembly 1 to form an air flow channel groove 312, and the air flow channel grooves 312 between two adjacent sections are arranged in a staggered mode; the air flow channel forming plate 31 is clamped between the membrane electrode assembly 1 and the flow channel bottom plate 22 of the adjacent air-cooling integrated membrane electrode structure of the fuel cell during stacking to form an air flow channel formed by connecting the air flow channel grooves 311, and air side sealing rubber blocks 32 are respectively arranged on two sides of the air flow channel forming plate 31 perpendicular to the air flow direction.
Hydrogen gas inlet/outlet channels 24 which are communicated with each other are reserved on the flow channel bottom plate 22, the air side sealing rubber block 32 and between the inlet end and the outlet end of the hydrogen gas flow channel and the hydrogen side sealing rubber block 23. That is, the hydrogen gas inlet/outlet passages 24 at corresponding positions on the respective members are communicated with each other to form the complete hydrogen gas inlet/outlet passages 24 on the entire air-cooling integrated membrane electrode assembly of the fuel cell, and at the same time, when a plurality of air-cooling integrated membrane electrode assemblies of the fuel cell are stacked with each other to form the fuel cell stack, the hydrogen gas inlet/outlet passages 24 on the air-cooling integrated membrane electrode assemblies of the fuel cell are further communicated with each other. One of the two hydrogen gas intake/exhaust passages 24 on both sides serves as a hydrogen gas intake passage, and the other serves as a hydrogen gas exhaust passage.
The width of the hydrogen flow channel 211 and the air flow channel 311 is 0.2 to 2mm, and the depth thereof is 0.2 to 2 mm. The thickness of the air flow passage forming plate 31 is 0.1 to 0.5 mm; the thickness of the hydrogen flow passage forming plate 21 is 0.5 to 1 mm. The hydrogen flow channel 212 and the air flow channel 312 have a square cross section and rounded corners on both sides of the bottom.
In a preferred embodiment, the hydrogen flow channel grooves 212 between adjacent sections of the hydrogen flow channel forming plate 21 are offset by 50% to 90% of the width of a single hydrogen flow channel groove 212; the air flow channel grooves 312 between adjacent sections of the air flow channel forming plate 31 are staggered by 50% to 90% of the width of a single air flow channel groove 312. Of course, the staggered ratio can be adjusted according to actual needs.
The width of each section of the hydrogen flow channel forming plate 21 in the hydrogen flow direction is 5-20 mm; the width of each segment of the air flow passage forming plate 31 in the direction along which air flows is 3 to 15 mm.
The hydrogen flow passage forming plate 21 and the air flow passage forming plate 31 may be made of stainless steel, and have a surface pre-plated or post-treated with a surface coating that is corrosion resistant and/or reduces contact resistance.
An empty side gasket 33 is provided between the air flow passage layer 3 and the membrane electrode assembly 1, and the empty side gasket 33 has a first avoidance hole 33 for avoiding the air flow passage and second avoidance holes 332 at both ends for forming the hydrogen gas intake/exhaust passage 24.
The runner structure fully utilizes the runner ridge structure (the hydrogen side is the hydrogen runner ridge 211, the air side is the air runner ridge 311) to make the air form an additional runner, and forms a shared runner by staggering with the original runner groove (the hydrogen side is the hydrogen runner groove 212, the air side is the air runner groove 312), so that the membrane electrode can be supplemented with gas more quickly under the same condition of the gas runner space, the power density and the durability of the whole gas pressure distribution of the membrane electrode are improved uniformly, and the effect is more obvious especially under the condition of high current density. Meanwhile, the gas consumption during the operation of the membrane electrode causes the gas flow speed at the runner groove to be faster than that at the runner ridge, and relative negative pressure is formed at the runner groove, so that the water inside the air-cooled reactor is not easy to be taken away by air flow, and the problem of water shortage frequently caused by the operation of the electric pile in the air-cooled reactor direct-current runner technology is solved. The relative negative pressure and the gas-gas pressure drop can be adjusted by the dislocation proportion and the width proportion of the adjacent discharge channel grooves and ridges to find the optimal matching suitable for different size galvanic piles and different application scenes.
Claims (8)
1. An air-cooled integrated membrane electrode structure of a fuel cell comprises a membrane electrode assembly, and an air flow channel layer and a hydrogen flow channel layer which are respectively positioned at two sides of the membrane electrode assembly, wherein the air flow channel layer is provided with an air flow channel, the hydrogen flow channel layer is provided with a hydrogen flow channel, the hydrogen flow channel is arranged along the long axis direction of the membrane electrode assembly, the air flow channel is arranged along the short axis direction of the membrane electrode assembly, the air flow channel is characterized in that,
the hydrogen flow channel layer comprises a hydrogen flow channel forming plate, the hydrogen flow channel forming plate is divided into a plurality of sections according to the hydrogen flow direction, each section of structure sequentially protrudes towards two surfaces of the hydrogen flow channel forming plate according to the direction vertical to the hydrogen flow direction, wherein one side of the hydrogen flow channel forming plate, which faces towards the membrane electrode assembly, protrudes to form a hydrogen flow channel ridge, one side of the hydrogen flow channel forming plate, which faces away from the membrane electrode assembly, protrudes to form a hydrogen flow channel groove, and the hydrogen flow channel grooves between two adjacent sections are arranged in a staggered manner; wherein, a flow channel bottom plate is arranged at one side far away from the membrane electrode assembly, a hydrogen flow channel forming plate is clamped between the membrane electrode assembly and the flow channel bottom plate to form a hydrogen flow channel formed by connecting hydrogen flow channel grooves, and the periphery of the hydrogen flow channel forming plate is also provided with a circle of hydrogen side sealing rubber blocks;
the air flow channel layer comprises an air flow channel forming plate, the air flow channel forming plate is divided into a plurality of sections according to the air flow direction, each section of structure sequentially protrudes towards two sides of the air flow channel forming plate according to the direction perpendicular to the air flow direction, wherein one side of the air flow channel layer protrudes towards the membrane electrode assembly to form an air flow channel ridge, one side of the air flow channel layer protrudes away from the membrane electrode assembly to form an air flow channel groove, and the air flow channel grooves between two adjacent sections are arranged in a staggered mode; the membrane electrode assembly and a flow channel bottom plate of an adjacent fuel cell air-cooling integrated membrane electrode structure are clamped by an air flow channel forming plate to form an air flow channel formed by connecting air flow channel grooves when being stacked, and air side sealing rubber blocks are respectively arranged on two sides of the air flow channel forming plate, which are vertical to the air flow direction;
and hydrogen gas inlet/exhaust channels which are communicated with each other are reserved on the flow channel bottom plate, the air side sealing rubber block and between the inlet end and the outlet end of the hydrogen gas flow channel and the hydrogen side sealing rubber block.
2. The air-cooled integrated membrane electrode assembly for fuel cells according to claim 1, wherein the width of the hydrogen channel and the air channel is 0.2 to 2mm, and the depth thereof is 0.2 to 2 mm.
3. The air-cooled integrated membrane electrode assembly for a fuel cell according to claim 1, wherein the air flow channel formation plate has a thickness of 0.1 to 0.5 mm; the thickness of the hydrogen flow channel forming plate is 0.5 to 1 mm.
4. The air-cooled integrated membrane electrode assembly for a fuel cell according to claim 1, wherein the staggered distance of the hydrogen flow channel grooves between two adjacent sections of the hydrogen flow channel forming plate is 50% to 90% of the width of a single hydrogen flow channel groove; the staggered distance of the air flow channel grooves between two adjacent sections on the air flow channel forming plate is 50-90% of the width of a single air flow channel groove.
5. The air-cooled integrated membrane electrode assembly for a fuel cell according to claim 1, wherein the width of each segment of the hydrogen flow channel forming plate in the hydrogen flow direction is 5 to 20 mm; the width of each section of the air flow channel forming plate in the air flowing direction is 3-15 mm.
6. The air-cooled integrated membrane electrode assembly according to claim 1, wherein the hydrogen flow channel-forming plate and the air flow channel-forming plate are made of stainless steel, and have a surface pre-plated or post-treated with a surface coating that is corrosion resistant and/or reduces contact resistance.
7. The air-cooled integrated membrane electrode assembly according to claim 1, wherein the hydrogen channel grooves and the air channel grooves have a square cross section, and both sides of the groove bottom have rounded corners.
8. The air-cooled integrated membrane electrode assembly for a fuel cell according to claim 1, wherein a dummy spacer is provided between the air flow passage layer and the membrane electrode assembly, and the dummy spacer has a first avoiding hole for avoiding the air flow passage and second avoiding holes at both ends for forming a hydrogen gas inlet/outlet passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123085161.XU CN216850001U (en) | 2021-12-07 | 2021-12-07 | Air cooling integrated membrane electrode structure of fuel cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123085161.XU CN216850001U (en) | 2021-12-07 | 2021-12-07 | Air cooling integrated membrane electrode structure of fuel cell |
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| CN216850001U true CN216850001U (en) | 2022-06-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064721A (en) * | 2022-06-08 | 2022-09-16 | 上海电气集团股份有限公司 | Air-cooled fuel single cell assembly and air-cooled fuel cell stack structure |
| CN115621486A (en) * | 2022-09-15 | 2023-01-17 | 海卓动力(青岛)能源科技有限公司 | Gas diffusion layer with variable-gradient staggered guide flow channels and preparation method thereof |
-
2021
- 2021-12-07 CN CN202123085161.XU patent/CN216850001U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064721A (en) * | 2022-06-08 | 2022-09-16 | 上海电气集团股份有限公司 | Air-cooled fuel single cell assembly and air-cooled fuel cell stack structure |
| CN115064721B (en) * | 2022-06-08 | 2023-12-29 | 上海电气集团股份有限公司 | Air-cooled fuel single cell assembly and air-cooled fuel cell stack structure |
| CN115621486A (en) * | 2022-09-15 | 2023-01-17 | 海卓动力(青岛)能源科技有限公司 | Gas diffusion layer with variable-gradient staggered guide flow channels and preparation method thereof |
| CN115621486B (en) * | 2022-09-15 | 2023-08-18 | 海卓动力(青岛)能源科技有限公司 | Gas diffusion layer with variable gradient staggered guide flow channels and preparation method thereof |
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