CN220510070U - Membrane electrode of single cell, fuel cell stack and vehicle - Google Patents
Membrane electrode of single cell, fuel cell stack and vehicle Download PDFInfo
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- CN220510070U CN220510070U CN202322179396.8U CN202322179396U CN220510070U CN 220510070 U CN220510070 U CN 220510070U CN 202322179396 U CN202322179396 U CN 202322179396U CN 220510070 U CN220510070 U CN 220510070U
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- boss
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- 239000012528 membrane Substances 0.000 title claims abstract description 68
- 239000000446 fuel Substances 0.000 title claims abstract description 25
- 239000001257 hydrogen Substances 0.000 claims abstract description 142
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 142
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 116
- 230000000903 blocking effect Effects 0.000 claims abstract description 29
- 239000003292 glue Substances 0.000 claims description 50
- 238000009826 distribution Methods 0.000 claims description 43
- 150000002431 hydrogen Chemical class 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 239000000110 cooling liquid Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 claims 13
- 210000000170 cell membrane Anatomy 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 18
- 238000009792 diffusion process Methods 0.000 abstract description 11
- 239000002826 coolant Substances 0.000 description 8
- 230000000149 penetrating effect Effects 0.000 description 6
- 238000010248 power generation Methods 0.000 description 5
- 239000012495 reaction gas Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Fuel Cell (AREA)
Abstract
The utility model relates to a membrane electrode of a single cell, a single cell of a fuel cell stack, a fuel cell stack and a vehicle, wherein a hydrogen inlet, a hydrogen outlet, an air inlet, an air outlet, a hydrogen inlet channel boss, a hydrogen outlet channel boss, an air inlet channel boss and an air outlet channel boss are arranged on the membrane electrode; the outer sides of the hydrogen inlet channel bosses are respectively provided with rubber blocking blocks connected with the hydrogen inlet channel bosses at two sides of the hydrogen inlet channel; the outer sides of the hydrogen outlet channel bosses are respectively provided with rubber blocking blocks connected with the hydrogen outlet channel bosses at two sides of the hydrogen outlet channel; the outer edge of the air inlet channel boss is provided with rubber blocking blocks connected with the air inlet channel boss at two sides of the air inlet channel respectively; and rubber blocking blocks connected with the air outlet channel bosses are respectively arranged on two sides of the air outlet channel outside the air outlet channel bosses. The utility model can avoid blocking the gas to influence the normal diffusion of the gas.
Description
Technical Field
The utility model relates to the technical field of fuel cell stack single cells, in particular to a membrane electrode of a single cell, a fuel cell stack and a vehicle.
Background
The fuel cell directly converts renewable chemical energy into electric energy, has high theoretical efficiency and power density, and is a very promising environment-friendly power generation device. The fuel cell is a fourth generation power generation technology following hydroelectric power generation, thermal power generation and atomic power generation, and can provide energy for automobiles, portable equipment and fixing devices. Compared with the traditional internal combustion engine, the fuel cell has no noise pollution, generates less gas pollution, and has high efficiency and stability. Among them, PEMFCs have high power density and energy conversion efficiency, low operating temperature, and rapid start-up and stop characteristics, and are the most attractive energy conversion systems.
The single cell consists of a cathode plate, an anode plate and a membrane electrode, wherein the membrane electrode, the cathode plate and the anode plate construct flow fields of hydrogen, oxygen and a coolant. The membrane electrode consisting of the proton exchange membrane, the gas diffusion layer and the catalytic layer is a core component of the PEMFC, and the reduction of hydrogen and the oxidation of oxygen respectively occur at the anode and the cathode of the membrane electrode. Electrons generated by the membrane electrode are transferred from the anode to the cathode through the plate, and simultaneously, a coolant circulates in the flow channels of the plate to prevent overheating of the PEMFC. In order to ensure that hydrogen, oxygen and coolant in each cavity of the single cell leak into each other or leak into the external environment of the cell, the membrane electrode, the cathode plate and the anode plate need to be sealed.
The sealing structure and sealing method of a non-welded metal plate cell disclosed in patent document CN112701315a include: the anode plate, the membrane electrode and the cathode plate which are sequentially stacked along the same direction to form a single cell frame structure are provided with a plurality of glue injection holes, a groove structure comprising a first channel and a second channel is arranged around the cavity opening of the electrode plate, and gas channeling can not occur between cavities through glue injection in the groove structure to realize sealing of inlets and outlets of all flow channels. According to the scheme, the glue injection is used for replacing welding, so that the production efficiency is improved, and the tightness of the single cell is enhanced. However, in the glue injection process, the glue is not considered to permeate into the single cell along the edges of the empty inlet and outlet channel boss and the hydrogen inlet and outlet channel boss, so that the glue may permeate into the hydrogen duct or the air duct and the gas distribution area in the glue injection process, thereby blocking the gas diffusion channel, affecting gas diffusion and leading to poor performance of the single cell.
Therefore, it is necessary to develop a membrane electrode of a single cell, a fuel cell stack, and a vehicle.
Disclosure of Invention
The utility model aims to provide a membrane electrode of a single cell, a single cell of a fuel cell stack, the fuel cell stack and a vehicle, which can avoid blocking gas to influence normal diffusion of the gas.
In a first aspect, the membrane electrode of the single cell is provided with a hydrogen inlet, a hydrogen outlet, a cooling liquid inlet, a cooling liquid outlet, an air inlet, an air outlet and a glue injection hole; the anode side of the membrane electrode is also provided with a hydrogen distribution area, a hydrogen inlet channel communicated with the hydrogen distribution area and the hydrogen inlet and a hydrogen outlet channel communicated with the hydrogen distribution area and the hydrogen outlet; the cathode side of the membrane electrode is also provided with an air distribution area, an air inlet channel communicated with the air distribution area and the air inlet, and an air outlet channel communicated with the air distribution area and the air outlet; the anode side of the membrane electrode is provided with a hydrogen inlet channel boss at the periphery edge close to the hydrogen inlet; the periphery of the anode side of the membrane electrode, which is close to the edge of the hydrogen outlet, is provided with a hydrogen outlet channel boss; air inlet channel bosses are arranged on the periphery of the edge, close to the air inlet, of the cathode side of the membrane electrode; air outlet channel bosses are arranged on the periphery of the edge, close to the air outlet, of the cathode side of the membrane electrode;
the outer sides of the hydrogen inlet channel bosses are respectively provided with rubber blocking blocks connected with the hydrogen inlet channel bosses at two sides of the hydrogen inlet channel;
the outer sides of the hydrogen outlet channel bosses are respectively provided with rubber blocking blocks connected with the hydrogen outlet channel bosses at two sides of the hydrogen outlet channel;
the outer edge of the air inlet channel boss is provided with rubber blocking blocks connected with the air inlet channel boss at two sides of the air inlet channel respectively;
and rubber blocking blocks connected with the air outlet channel bosses are respectively arranged on two sides of the air outlet channel outside the air outlet channel bosses.
Optionally, the top surface of the glue blocking block on the anode side of the membrane electrode, the top surface of the hydrogen inlet channel boss and the top surface of the hydrogen outlet channel boss are flush; the design of the height level is to further prevent glue from entering the corresponding hydrogen distribution area from the gaps of the glue blocking block and the corresponding boss, thereby affecting the performance of the single cell.
Optionally, the top surface of the glue blocking block on the cathode side of the membrane electrode, the top surface of the air inlet channel boss and the top surface of the air outlet channel boss are flush; the design of the height level is used for further preventing glue from entering the corresponding air distribution area from the gap between the glue blocking block and the corresponding boss, thereby influencing the performance of the single cell.
Optionally, the hydrogen inlet channel comprises a plurality of hydrogen inlet ducts arranged on the hydrogen inlet channel boss. The hydrogen inlet duct is matched with the hydrogen distribution area, so that hydrogen can uniformly flow into the anode flow channel.
Optionally, the hydrogen outlet channel comprises a plurality of hydrogen outlet ducts arranged on the hydrogen outlet channel boss. The hydrogen outlet duct is matched with the hydrogen distribution area, so that hydrogen can uniformly flow out of the anode flow channel.
Optionally, the air inlet channel comprises a plurality of air inlet ducts arranged on the air inlet channel boss, and the air inlet ducts are matched with the air distribution area, so that air can uniformly flow into the cathode flow channel.
Optionally, the air outlet channel comprises a number of air outlet ducts arranged on an air outlet channel boss. The air outlet duct is matched with the air distribution area, so that air can uniformly flow out of the cathode flow channel.
In a second aspect, the utility model provides a single cell of a fuel cell stack, which comprises an anode plate, a membrane electrode and a cathode plate, wherein the anode plate, the membrane electrode and the cathode plate are sequentially stacked together and are adhered and sealed by glue; the membrane electrode adopts the membrane electrode of the single cell.
In a third aspect, the present utility model provides a fuel cell stack, which uses a fuel cell stack unit cell according to the present utility model.
In a fourth aspect, a vehicle according to the present utility model employs a fuel cell stack according to the present utility model.
The utility model has the beneficial effects that:
(1) The glue blocking block at the anode side of the membrane electrode can better prevent glue from penetrating into the hydrogen distribution area, the hydrogen inlet duct and the hydrogen outlet duct from the edges of the hydrogen inlet channel boss and the hydrogen outlet channel boss in the glue injection process, so that the phenomenon that gas is blocked, normal diffusion of the gas is affected and the performance of a single cell is reduced is avoided.
(2) The arrangement of the glue blocking block on the cathode side of the membrane electrode can better prevent glue from penetrating into the air distribution area, the air inlet duct and the air outlet duct from the edges of the air inlet channel boss and the air outlet channel boss in the glue injection process, so that the phenomenon that gas is blocked, normal diffusion of the gas is affected and the performance of a single cell is reduced is avoided.
Drawings
Fig. 1 is a schematic structural view of a fuel cell stack unit cell in the present embodiment;
FIG. 2 is a schematic view of the structure of the anode side of the membrane electrode plate in this embodiment;
FIG. 3 is an enlarged partial schematic view of FIG. 2;
FIG. 4 is a schematic view of the cathode side of the membrane electrode assembly according to the present embodiment;
FIG. 5 is an enlarged partial schematic view of FIG. 4;
in the figure: 1-cathode plate, 2-membrane electrode, 201-hydrogen inlet, 202-hydrogen inlet channel boss, 204-glue baffle block, 205-coolant outlet, 206-hydrogen outlet, 207-hydrogen outlet channel boss, 208-hydrogen outlet duct, 209-hydrogen distribution area, 210-glue injection hole, 211-coolant inlet, 212-air inlet channel boss, 213-air inlet duct, 214-air distribution area, 215-air inlet, 216-air outlet, 217-air outlet channel boss, 218-air outlet duct, 3-anode plate.
Detailed Description
Further advantages and effects of the present utility model will become readily apparent to those skilled in the art from the disclosure herein, by referring to the following description of the embodiments of the present utility model with reference to the accompanying drawings and preferred examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
As shown in fig. 1 to 5, in the present embodiment, a membrane electrode of a single cell is provided with a hydrogen gas inlet 201, a hydrogen gas outlet 206, a cooling liquid inlet 211, a cooling liquid outlet 205, an air inlet 215, an air outlet 216 and a glue injection hole 210 on a membrane electrode 2; the anode side of the membrane electrode 2 is also provided with a hydrogen distribution area 209, a hydrogen inlet channel which is communicated with the hydrogen distribution area 209 and the hydrogen inlet 201, and a hydrogen outlet channel which is communicated with the hydrogen distribution area 209 and the hydrogen outlet 206; the cathode side of the membrane electrode 2 is further provided with an air distribution area 214, an air inlet channel communicating with the air distribution area 214 and the air inlet 215, and an air outlet channel communicating with the air distribution area 214 and the air outlet 216. The anode side of the membrane electrode 2 is provided with a hydrogen inlet channel boss 202 near the peripheral edge of the hydrogen inlet 201, and two sides of the hydrogen inlet channel outside the hydrogen inlet channel boss 202, which are positioned on the hydrogen inlet channel, are respectively provided with a glue blocking block 204 connected with the hydrogen inlet channel boss 202. The anode side of the membrane electrode 2 is provided with a hydrogen outlet channel boss 207 around the edge near the hydrogen outlet 206, and two sides of the hydrogen outlet channel outside the hydrogen outlet channel boss 207, which are located in the hydrogen outlet channel, are respectively provided with a glue blocking block 204 connected with the hydrogen outlet channel boss 207. The cathode side of the membrane electrode 2 is provided with air inlet channel bosses 212 around the edge near the air inlet 215, and two sides of the air inlet channel outside the air inlet channel bosses 212 are respectively provided with a glue blocking block 204 connected with the air inlet channel bosses 212. The cathode side of the membrane electrode 2 is provided with air outlet channel bosses 217 around the edge near the air outlet 216, and two sides of the air outlet channel outside the air outlet channel bosses 217 are respectively provided with a glue blocking block 204 connected with the air outlet channel bosses 217.
As shown in fig. 2 and 3, in the present embodiment, the hydrogen inlet channel boss 202 and the hydrogen outlet channel boss 207 are disposed to prevent glue from penetrating into the hydrogen inlet duct 203, the hydrogen outlet duct 208 and the hydrogen distribution area 209 during the glue injection process, so as to affect the diffusion of the reaction gas and thus the performance of the single cell. The glue blocking block 204 on the anode side of the membrane electrode is arranged to better prevent glue from penetrating into the hydrogen distribution area 209, the hydrogen inlet duct 203 and the hydrogen outlet duct 208 from the edges of the hydrogen inlet channel boss 202 and the hydrogen outlet channel boss 207 in the glue injection process, so that gas is blocked, gas diffusion is affected, and therefore single cell performance is affected.
As shown in fig. 4 and 5, in the present embodiment, the air inlet channel boss 212 and the air outlet channel boss 217 are disposed to prevent glue from penetrating into the air inlet duct 213, the air outlet duct 218 and the air distribution area 214 during the glue injection process, so as to affect the diffusion of the reaction gas, and thus the performance of the single cell. The glue blocking block 204 on the cathode side of the membrane electrode is provided to better prevent glue from penetrating from the edges of the air inlet channel boss 212 and the air outlet channel boss 217 to the air distribution area 214, the air inlet duct 213 and the air outlet duct 218 during the glue injection process, so as to block the gas and influence the gas diffusion.
As shown in fig. 3, in this embodiment, the top surface of the glue block 204 on the anode side of the membrane electrode, the top surface of the hydrogen inlet channel boss 202, and the top surface of the hydrogen outlet channel boss 207 are flush; the highly flush design is to further prevent glue from entering the corresponding hydrogen distribution area 209 from the glue stop 204 and corresponding boss gap, thereby affecting cell performance.
As shown in fig. 5, in this embodiment, the top surface of the glue block 204 on the cathode side of the membrane electrode, the top surface of the air inlet channel boss 212, and the top surface of the air outlet channel boss 217 are flush; the highly flush design is to further prevent glue from entering the air distribution area 214 from the glue stop 204 and corresponding boss gap, thereby affecting cell performance.
As shown in fig. 2 and 3, in the present embodiment, the hydrogen inlet channel includes a plurality of hydrogen inlet channels 203 disposed on a hydrogen inlet channel boss 202. The hydrogen inlet duct 203 is a channel which is arranged in the hydrogen inlet channel boss 202 and is used for connecting the hydrogen inlet 201 with the hydrogen distribution area 209, and the hydrogen inlet duct 203 is matched with the hydrogen distribution area 209, so that hydrogen can uniformly flow into the anode flow channel.
As shown in fig. 2, in the present embodiment, the hydrogen outlet channel includes a plurality of hydrogen outlet channels 208 disposed on a hydrogen outlet channel boss 207. The hydrogen outlet duct 208 is a channel which is arranged in the hydrogen outlet channel boss 207 and is used for connecting the hydrogen outlet 206 with the hydrogen distribution area, and the hydrogen outlet duct 208 is matched with the hydrogen distribution area 209, so that hydrogen can uniformly flow out of the anode flow channel.
As shown in fig. 4 and 5, in the present embodiment, the air inlet channel includes a plurality of air inlet ducts 213 disposed on the air inlet channel boss 212. The air inlet duct 213 is a channel formed inside the air inlet channel boss 212 and connected with the air inlet 215 and corresponding to the air distribution area 214, and the air inlet duct 213 and the air distribution area 214 are matched, so that air can uniformly flow into the cathode flow channel.
As shown in fig. 4, in this embodiment, the air outlet channel includes a plurality of air outlet ducts 218 provided on an air outlet channel boss 217. The air outlet duct 218 is a channel formed inside the air outlet channel boss 217 and connected with the air outlet 216 and corresponding to the air distribution area 214, and the air outlet duct 218 and the air distribution area 214 are matched, so that air can uniformly flow out of the cathode flow channel.
As shown in fig. 2 to 5, in the present embodiment, the air inlet 215 and the air outlet 216 are channels for the reaction gas air to enter and exit the single cells. The hydrogen inlet 201 and the hydrogen outlet 206 are channels for the reaction gas hydrogen to enter and exit the single cell. The coolant inlet 211 and the coolant outlet 205 are channels for the coolant to enter and exit the single cells.
In the embodiment, a single cell of a fuel cell stack comprises an anode plate 3, a membrane electrode 2 and a cathode plate 1, wherein the anode plate 3, the membrane electrode 2 and the cathode plate 1 are sequentially stacked together and sealed by glue; the membrane electrode adopts the membrane electrode of the single cell as described in this embodiment.
In this embodiment, a fuel cell stack employing the fuel cell stack unit cell as described in this embodiment.
In this embodiment, a vehicle employs the fuel cell stack as described in this embodiment.
The embodiments described above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present utility model should be made in the equivalent manner, and are included in the scope of the present utility model.
Claims (10)
1. A membrane electrode of a single cell, wherein a hydrogen inlet (201), a hydrogen outlet (206), a cooling liquid inlet (211), a cooling liquid outlet (205), an air inlet (215), an air outlet (216) and a glue injection hole (210) are arranged on the membrane electrode (2); the anode side of the membrane electrode (2) is also provided with a hydrogen distribution area (209), a hydrogen inlet channel which is communicated with the hydrogen distribution area (209) and the hydrogen inlet (201) and a hydrogen outlet channel which is communicated with the hydrogen distribution area (209) and the hydrogen outlet (206); the cathode side of the membrane electrode (2) is also provided with an air distribution area (214), an air inlet channel which is communicated with the air distribution area (214) and an air inlet (215) and an air outlet channel which is communicated with the air distribution area (214) and an air outlet (216); the anode side of the membrane electrode (2) is provided with a hydrogen inlet channel boss (202) near the peripheral edge of the hydrogen inlet (201); the periphery of the anode side of the membrane electrode (2) near the edge of the hydrogen outlet (206) is provided with a hydrogen outlet channel boss (207); an air inlet channel boss (212) is arranged on the periphery of the edge, close to the air inlet (215), of the cathode side of the membrane electrode (2); an air outlet channel boss (217) is arranged on the periphery of the edge, close to the air outlet (216), of the cathode side of the membrane electrode (2); the method is characterized in that:
the outer sides of the hydrogen inlet channel bosses (202) are respectively provided with a rubber blocking block (204) connected with the hydrogen inlet channel bosses (202) at two sides of the hydrogen inlet channel;
the outer sides of the hydrogen outlet channel bosses (207) are respectively provided with a glue blocking block (204) connected with the hydrogen outlet channel bosses (207) at two sides of the hydrogen outlet channel;
the outer edge of the air inlet channel boss (212) is provided with rubber blocking blocks (204) connected with the air inlet channel boss (212) at two sides of the air inlet channel respectively;
and rubber blocking blocks (204) connected with the air outlet channel bosses (217) are respectively arranged at two sides of the air outlet channel outside the air outlet channel bosses (217).
2. The membrane electrode assembly of a single cell of claim 1, wherein: the top surface of the glue blocking block (204) on the anode side of the membrane electrode, the top surface of the hydrogen inlet channel boss (202) and the top surface of the hydrogen outlet channel boss (207) are flush.
3. The membrane electrode assembly of a single cell of claim 1, wherein: the top surface of the glue blocking block (204) on the cathode side of the membrane electrode, the top surface of the air inlet channel boss (212) and the top surface of the air outlet channel boss (217) are flush.
4. The membrane electrode assembly of a single cell of claim 1, wherein: the hydrogen inlet channel comprises a plurality of hydrogen inlet ducts (203) arranged on a hydrogen inlet channel boss (202).
5. The membrane electrode assembly of a single cell of claim 1, wherein: the hydrogen outlet channel comprises a plurality of hydrogen outlet ducts (208) arranged on a hydrogen outlet channel boss (207).
6. The membrane electrode assembly of a single cell of claim 1, wherein: the air inlet channel comprises a plurality of air inlet ducts (213) arranged on an air inlet channel boss (212).
7. The membrane electrode assembly of a single cell of claim 1, wherein: the air outlet channel comprises a number of air outlet ducts (218) arranged on an air outlet channel boss (217).
8. The single cell of the fuel cell stack comprises an anode plate (3), a membrane electrode (2) and a cathode plate (1), wherein the anode plate (3), the membrane electrode (2) and the cathode plate (1) are sequentially stacked together and sealed by glue; the method is characterized in that: the membrane electrode (2) employs the single cell membrane electrode as defined in any one of claims 1 to 7.
9. A fuel cell stack characterized by: a fuel cell stack cell according to claim 8.
10. A vehicle, characterized in that: a fuel cell stack according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322179396.8U CN220510070U (en) | 2023-08-14 | 2023-08-14 | Membrane electrode of single cell, fuel cell stack and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322179396.8U CN220510070U (en) | 2023-08-14 | 2023-08-14 | Membrane electrode of single cell, fuel cell stack and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220510070U true CN220510070U (en) | 2024-02-20 |
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ID=89870157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322179396.8U Active CN220510070U (en) | 2023-08-14 | 2023-08-14 | Membrane electrode of single cell, fuel cell stack and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220510070U (en) |
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2023
- 2023-08-14 CN CN202322179396.8U patent/CN220510070U/en active Active
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