CN218989415U - PEM water electrolytic tank - Google Patents
PEM water electrolytic tank Download PDFInfo
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- CN218989415U CN218989415U CN202223039086.8U CN202223039086U CN218989415U CN 218989415 U CN218989415 U CN 218989415U CN 202223039086 U CN202223039086 U CN 202223039086U CN 218989415 U CN218989415 U CN 218989415U
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The utility model relates to the technical field of water electrolysis, and discloses a PEM water electrolysis cell, which comprises: the upper end plate is provided with a first hydrogen outlet and an oxygen outlet; the lower end plate is arranged right below the upper end plate, and a first water inlet is formed in the lower end plate; the multi-layer bipolar plate and the electrode are stacked between the upper end plate and the lower end plate, the bipolar plate comprises an anode surface and a cathode surface, a water-oxygen flow field is arranged on the anode surface, and a second water inlet and a water-oxygen outlet are arranged on two sides of the water-oxygen flow field; the cathode surface comprises a hydrogen flow field, and one end of the hydrogen flow field is provided with a second hydrogen outlet. The cathode plate and the anode plate which are independently arranged in the PEM water electrolysis cell are integrated, so that the structure of the water electrolysis cell is simplified under the condition that the integrity of the water electrolysis process is ensured, and the volume of the water electrolysis cell is reduced; on the other hand, the number of parts of the water electrolysis bath is reduced, and the processing and maintenance cost of the water electrolysis bath is reduced.
Description
Technical Field
The utility model relates to the technical field of water electrolysis, in particular to a PEM water electrolysis tank.
Background
PEM water baths use solid Proton Exchange Membranes (PEM) as electrolytes and pure water as a reactant. Because the hydrogen permeability of the PEM electrolyte is low, the purity of the generated hydrogen is high, only water vapor is needed to be removed, the process is simple, and the safety is high; the electrolytic tank adopts a zero-spacing structure, has lower ohmic resistance, obviously improves the overall efficiency of the electrolytic process, and has more compact volume; the pressure regulation and control range is large, the output pressure of hydrogen can reach several megapascals, and the device can adapt to the rapidly-changing renewable energy power input. However, in a common PEM water electrolytic tank, a cathode plate and an anode plate which are arranged independently are arranged, and a flow field is also arranged on an independent plate body, so that the PEM water electrolytic tank has larger volume, complex structure and high assembly difficulty; the number of parts is large, and the processing and maintenance costs of each part are high.
Disclosure of Invention
The purpose of the utility model is that: the PEM water electrolytic tank integrates a cathode plate and an anode plate which are arranged independently, simplifies the structure of the water electrolytic tank under the condition of ensuring the integrity of the water electrolytic process, and reduces the volume of the water electrolytic tank; on the other hand, the number of parts of the water electrolysis bath is reduced, and the processing and maintenance cost of the water electrolysis bath is reduced.
To achieve the above object, the present utility model provides a PEM water electrolyzer comprising:
the upper end plate is provided with a first hydrogen outlet and an oxygen outlet;
the lower end plate is arranged right below the upper end plate, and a first water inlet is formed in the lower end plate;
the bipolar plate comprises an anode face and a cathode face, a water-oxygen flow field is arranged on the anode face, a second water inlet and a water-oxygen outlet are arranged on two sides of the water-oxygen flow field, the position of the second water inlet corresponds to that of the first water inlet, and the position of the water-oxygen outlet corresponds to that of the oxygen outlet; the cathode surface comprises a hydrogen flow field, one end of the hydrogen flow field is provided with a second hydrogen outlet, and the second hydrogen outlet corresponds to the first hydrogen outlet in position.
Compared with the prior art, the PEM water electrolytic tank has the beneficial effects that: the PEM water electrolyzer comprises an upper end plate and a lower end plate, wherein a space formed between the upper end plate and the lower end plate is internally provided with a plurality of bipolar plates and electrodes which are stacked, the front surface and the back surface of each bipolar plate are respectively provided with an anode surface and a cathode surface, a water-oxygen flow field is arranged on the anode surface and used for carrying out water electrolysis, two ends of the water-oxygen flow field are respectively provided with a second water inlet and a water-oxygen outlet which are respectively communicated with a first water inlet on the lower end plate and an oxygen outlet on the upper end plate, and the water inlet and the oxygen outlet of the water-oxygen flow field are used for discharging the PEM water electrolyzer; the cathode surface is provided with a second hydrogen outlet at one side of the hydrogen flow field, is communicated with a first hydrogen outlet on the upper end plate and is used for discharging hydrogen. After the water electrolysis tank is adopted, the cathode plate and the anode plate which are independently arranged in the PEM water electrolysis tank are integrated, so that the structure of the water electrolysis tank is simplified under the condition that the integrity of the water electrolysis process is ensured, and the volume of the water electrolysis tank is reduced; on the other hand, the number of parts of the water electrolysis bath is reduced, and the processing and maintenance cost of the water electrolysis bath is reduced.
In the PEM water electrolytic cell provided by the embodiment of the utility model, one end of each layer of bipolar plate is provided with a connecting sheet, and the connecting sheet is connected with a battery voltage collector.
According to the PEM water electrolyzer provided by the embodiment of the utility model, two first water inlets are arranged, two second water inlets are correspondingly arranged, the two first water inlets are symmetrically arranged at two ends of the lower end plate in the width direction, and the second water inlets are symmetrically arranged at two ends of the bipolar plate in the width direction.
In the PEM water electrolyzer of the embodiment of the present utility model, the water-oxygen outlet and the second hydrogen outlet are symmetrically disposed at two ends of the bipolar plate in the width direction, and the first hydrogen outlet and the oxygen outlet are symmetrically disposed at two ends of the upper end plate in the width direction.
In the PEM water electrolyzer of the embodiment of the present utility model, the water-oxygen flow field and the hydrogen flow field are formed by recessing toward the bipolar plate, and a diffusion layer is disposed at the recession between the two bipolar plates.
In the PEM water electrolyzer of the embodiment of the utility model, the upper end insulating plate is arranged above the lower end plate in an abutting manner, and the upper end insulating plate is arranged below the upper end plate in an abutting manner.
In the PEM water electrolyzer of the embodiment of the utility model, the upper part of the lower insulating plate is provided with the cathode current collecting plate in an abutting manner, the lower part of the upper insulating plate is provided with the anode current collecting plate in an abutting manner, and the anode current collecting plate and the cathode current collecting plate are coated with the anti-corrosion layer.
According to the PEM water electrolyzer of the embodiment of the utility model, the sizes and shapes of the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate are the same, fixing holes are correspondingly formed at the edges of the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate, and the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate are fixed together through the fixing holes.
According to the PEM water electrolytic tank provided by the embodiment of the utility model, the screw rod is penetrated in the fixing hole, and the disc spring component and the locking nut which are matched with the screw rod are arranged above the upper end plate.
According to the PEM water electrolyzer provided by the embodiment of the utility model, a plurality of fixing holes are formed, the fixing holes are uniformly distributed on the edges of the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate, and the distances between the adjacent fixing holes are equal.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a PEM water electrolyzer in accordance with an embodiment of the present utility model;
FIG. 2 is a schematic view of the anode side structure of a bipolar plate of a PEM water electrolyzer according to an embodiment of the present utility model;
FIG. 3 is a schematic view of the cathode side structure of a bipolar plate of a PEM water electrolyzer according to an embodiment of the present utility model;
in the figure, 1, an upper end plate; 11. a first hydrogen outlet; 12. an oxygen outlet; 2. a lower end plate; 21. a first water inlet; 22. supporting feet; 3. a bipolar plate; 31. an anode surface; 311. a water oxygen flow field; 312. a second water inlet; 313. a water oxygen outlet; 32. a cathode face; 321. a hydrogen flow field; 322. a second hydrogen outlet; 33. a connecting sheet; 34. a seal groove; 4. a lower insulating plate; 5. an upper insulating plate; 6. an anode current collecting plate; 7. a cathode current collecting plate; 8. a fixing hole; 9. a screw; 91. a lock nut; 10. and a disc spring assembly.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
As shown in fig. 1, a PEM water electrolyzer of the preferred embodiment of the present utility model comprises an upper end plate 1 and a lower end plate 2, wherein the upper end plate 1 is provided with a first hydrogen outlet 11 and an oxygen outlet 12 for removing and collecting hydrogen and oxygen after water electrolysis; the lower end plate 2 is disposed right below the upper end plate 1, and a first water inlet 21 is provided in the lower end plate 2 for supplying water for the water electrolysis reaction.
As shown in fig. 1, a PEM water electrolyzer of the preferred embodiment of the present utility model further comprises a multi-layer bipolar plate 3, the multi-layer bipolar plate 3 is stacked between the upper end plate 1 and the lower end plate 2, the bipolar plate 3 comprises an anode surface 31 and a cathode surface 32, a water-oxygen flow field 311 is arranged on the anode surface 31 for carrying out the electrolysis of water, a second water inlet 312 and a water-oxygen outlet 313 are arranged on two sides of the water-oxygen flow field 311, the position of the second water inlet 312 corresponds to the position of the first water inlet 21, the position of the water-oxygen outlet 313 corresponds to the position of the oxygen outlet 12, the second water inlet 312 and the water-oxygen outlet 313 are respectively communicated with the first water inlet 21 on the lower end plate 2 and the oxygen outlet 12 on the upper end plate 1, and the water inlet and the oxygen outlet for the water-oxygen flow field 311 are discharged out of the PEM water electrolyzer; the cathode surface 32 comprises a hydrogen flow field 321, one end of the hydrogen flow field 321 is provided with a second hydrogen outlet 322, the second hydrogen outlet 322 corresponds to the first hydrogen outlet 11 in position, and the second hydrogen outlet 322 is communicated with the first hydrogen outlet 11 on the upper end plate 1 and is used for discharging and collecting hydrogen. After the water electrolysis tank is adopted, the cathode plate and the anode plate which are independently arranged in the PEM water electrolysis tank are integrated, so that the structure of the water electrolysis tank is simplified under the condition that the integrity of the water electrolysis process is ensured, and the volume of the water electrolysis tank is reduced; on the other hand, the number of parts of the water electrolysis bath is reduced, and the processing and maintenance cost of the water electrolysis bath is reduced.
In some embodiments of the utility model, one end of each bipolar plate 3 is provided with a connecting tab 33. It will be appreciated that the connecting piece 33 and the bipolar plate 3 may be integrally formed and extend outwardly from the bipolar plate 3, or may be separately formed and welded to the bipolar plate 3, which is not particularly limited herein. The connection piece 33 is connected with a battery voltage collector, so that the single-chip battery voltage of the PEM electrolytic tank can be detected in real time, and the operation safety of the electrolytic tank is improved.
In some embodiments of the present utility model, the edge of the bipolar plate 3 is provided with a sealing member groove 34 in a surrounding manner, and a sealing member is embedded in the sealing member groove, so as to seal the hydrogen flow field 321, the water oxygen flow field 311 and the like from external influences on the electrolysis process.
In some embodiments of the present utility model, two first water inlets 21 and two second water inlets 312 are correspondingly provided, the two first water inlets 21 are symmetrically disposed at two ends of the lower end plate 2 in the width direction, the second water inlets 312 are symmetrically disposed at two ends of the bipolar plate 3 in the width direction, and the two symmetrical first water inlets 21 and the two symmetrical second water inlets 312 can improve the uniformity of water flowing into the water-oxygen flow field 311, so that water can flow in the flow field more uniformly, and the electrolysis efficiency is ensured.
In some embodiments of the present utility model, the water-oxygen outlet 313 and the second hydrogen outlet 322 are symmetrically disposed at two ends of the bipolar plate 3 in the width direction, and the first hydrogen outlet 11 and the oxygen outlet 12 are symmetrically disposed at two ends of the upper end plate 1 in the width direction, so that the hydrogen and the oxygen obtained by electrolysis are discharged at the same end of the water electrolyzer, which is beneficial for the external device to collect the hydrogen and the oxygen.
In some embodiments of the present utility model, the water-oxygen flow field 311 and the hydrogen flow field 321 are concavely formed towards the direction of the bipolar plate 3, a diffusion layer is arranged at the concave position between the two bipolar plates 3, a cavity formed by the concaves of the water-oxygen flow field 311 is used for being embedded into an anode diffusion layer, a cavity formed by the concaves of the hydrogen flow field 321 is used for being embedded into a cathode diffusion layer, and the CCM is arranged between the water-oxygen flow field 311 and the hydrogen flow field 321 and used for isolating hydrogen and oxygen, so that the hydrogen and the oxygen are collected in different directions of the bipolar plates 3. Further, the diffusion layer and the CCM may be integrally formed or may be separately provided, and are not particularly limited herein.
In some embodiments of the present utility model, a lower insulating plate 4 is disposed above the lower end plate 2 in an abutting manner, and an upper insulating plate 5 is disposed below the upper end plate 1 in an abutting manner, where the upper insulating plate 5 and the lower insulating plate 4 are used to insulate the bipolar plate 3 from the upper end plate 1 and the lower end plate 2, respectively, so as to prevent the battery voltage on the bipolar plate 3 from being affected, and affect the electrolysis effect.
In some embodiments of the present utility model, the cathode current collector 6 is disposed above the lower insulating plate 4 and the anode current collector 7 is disposed below the upper insulating plate 5. The anode current collecting plate 7 and the cathode current collecting plate 6 are coated with an anti-corrosion layer, so that the anode current collecting plate 7 and the cathode current collecting plate 6 are prevented from being in excessive contact with oxygen and hydrogen respectively, and the current collecting plates are prevented from being corroded.
The edges of the upper end plate 1, the lower end plate 2, the bipolar plate 3, the lower end insulating plate 4, the upper end insulating plate 5, the cathode current collecting plate 6 and the anode current collecting plate 7 are correspondingly provided with fixing holes 8, the positions of the fixing holes 8 on different plate bodies are corresponding, fixing pieces are arranged in the fixing holes 8, and the fixing pieces and the fixing holes 8 enable the upper end plate 1, the lower end plate 2, the bipolar plate 3, the lower end insulating plate 4, the upper end insulating plate 5, the cathode current collecting plate 6 and the anode current collecting plate 7 to be fixed together, so that a plurality of plate bodies can be conveniently fixed at one time, the fixing time is shortened, and the processing efficiency is improved.
In some embodiments of the present utility model, a screw rod 9 is penetrated in the fixing hole 8, the upper end and the lower end of the screw rod 9 penetrate out of the upper end plate 1 and the lower end plate 2 respectively, a disc spring assembly 10 and a locking nut 91 matched with the screw rod 9 are arranged above the upper end plate 1, and the disc spring assembly 10 and the locking nut 91 lock the screw rod 9 in the fixing hole 8 to complete the fixation of all parts of the water electrolysis tank. Specifically, the number of the screws 9 and the fixing holes 8 may be set according to the structure of the electrolytic cell and the use requirement.
In some embodiments of the present utility model, a plurality of fixing holes 8 are provided, each fixing hole 8 is provided with a screw rod 9, a disc spring assembly 10 and a locking nut 91, and the plurality of fixing holes 8 are uniformly distributed on the edges of the upper end plate 1, the lower end plate 2, the bipolar plate 3, the lower end insulating plate 4, the upper end insulating plate 5, the cathode current collecting plate 6 and the anode current collecting plate 7, and the distances between the adjacent fixing holes 8 are equal, so that the water electrolytic tank is fixed by the screw rods 9 in all directions, and the overall fixation firmness of the water electrolytic tank is ensured.
In some embodiments of the utility model, the bottom of the lower end plate 2 is provided with a plurality of support feet 22 for supporting the water electrolysis cell. The support legs 22 and the lower end plate 2 may be integrally formed or may be fixed by other methods, which are not particularly limited herein.
The working process of the utility model is as follows: the PEM water electrolyzer comprises an upper end plate 1 and a lower end plate 2, wherein a plurality of bipolar plates 3 and electrodes which are stacked are arranged in a space formed between the upper end plate 2 and the lower end plate 2, the positive surface and the negative surface of the bipolar plates 3 are respectively provided with an anode surface 31 and a cathode surface 32, a water-oxygen flow field 311 is arranged on the anode surface 31 and is used for carrying out water electrolysis, two ends of the water-oxygen flow field 311 are respectively provided with a second water inlet 312 and a water-oxygen outlet 313, and the two ends are respectively communicated with a first water inlet 21 on the lower end plate 2 and an oxygen outlet 12 on the upper end plate 1 and are used for water inlet and oxygen discharge of the water-oxygen flow field 311; the cathode surface 32 is provided with a hydrogen flow field 321 corresponding to the anode surface 31, hydrogen generated after water electrolysis can enter the hydrogen flow field 321 after passing through the proton exchange membrane, one side of the cathode surface 32 in the hydrogen flow field 321 is provided with a second hydrogen outlet 322 which is communicated with the first hydrogen outlet 11 on the upper end plate 1 and is used for discharging hydrogen.
In summary, the embodiment of the utility model provides a PEM water electrolytic cell, which integrates a cathode plate and an anode plate which are independently arranged in the PEM water electrolytic cell, simplifies the structure of the water electrolytic cell under the condition of ensuring the integrity of the water electrolytic process, and reduces the volume of the water electrolytic cell; on the other hand, the number of parts of the water electrolysis bath is reduced, and the processing and maintenance cost of the water electrolysis bath is reduced.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (10)
1. A PEM water electrolyzer comprising:
the upper end plate is provided with a first hydrogen outlet and an oxygen outlet;
the lower end plate is arranged right below the upper end plate, and a first water inlet is formed in the lower end plate;
the bipolar plate comprises an anode face and a cathode face, a water-oxygen flow field is arranged on the anode face, a second water inlet and a water-oxygen outlet are arranged on two sides of the water-oxygen flow field, the position of the second water inlet corresponds to that of the first water inlet, and the position of the water-oxygen outlet corresponds to that of the oxygen outlet; the cathode surface comprises a hydrogen flow field, one end of the hydrogen flow field is provided with a second hydrogen outlet, and the second hydrogen outlet corresponds to the first hydrogen outlet in position.
2. PEM water electrolyser according to claim 1, characterized in that: one end of each layer of bipolar plate is provided with a connecting sheet, and the connecting sheet is connected with a battery voltage collector.
3. PEM water electrolyser according to claim 1, characterized in that: the two first water inlets are arranged, the two second water inlets are correspondingly arranged, the two first water inlets are symmetrically arranged at two ends of the lower end plate in the width direction, and the second water inlets are symmetrically arranged at two ends of the bipolar plate in the width direction.
4. PEM water electrolyser according to claim 1, characterized in that: the water oxygen outlet and the second hydrogen outlet are symmetrically arranged at two ends of the bipolar plate in the width direction, and the first hydrogen outlet and the oxygen outlet are symmetrically arranged at two ends of the upper end plate in the width direction.
5. PEM water electrolyser according to claim 1, characterized in that: the water-oxygen flow field and the hydrogen flow field are concaved towards the direction of the bipolar plate, and a diffusion layer is arranged at the concave position between the two bipolar plates.
6. PEM water electrolyser according to claim 1, characterized in that: the upper end plate is arranged on the upper side of the upper end plate in an abutting mode.
7. The PEM water electrolyzer of claim 6 wherein: the upper side butt of lower extreme insulation board is provided with the negative pole current collector, the lower side butt of upper end insulation board is provided with the positive pole current collector, positive pole current collector with scribble on the negative pole current collector and be equipped with the anticorrosive coating.
8. The PEM water electrolyzer of claim 7 wherein: the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate are the same in size and shape, the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the edge of the anode current collecting plate are provided with fixing holes correspondingly, and the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the anode current collecting plate are fixed together through the fixing holes.
9. The PEM water electrolyzer of claim 8 wherein: the screw rod is arranged in the fixing hole in a penetrating way, and a disc spring component and a locking nut which are matched with the screw rod are arranged above the upper end plate.
10. The PEM water electrolyzer of claim 8 wherein: the fixed orifices are provided with a plurality of, a plurality of the fixed orifices evenly distributed in the upper end plate, the lower end plate, the bipolar plate, the lower end insulating plate, the upper end insulating plate, the cathode current collecting plate and the positive electrode current collecting plate are along, and the distance is equal before the adjacent fixed orifices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223039086.8U CN218989415U (en) | 2022-11-14 | 2022-11-14 | PEM water electrolytic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223039086.8U CN218989415U (en) | 2022-11-14 | 2022-11-14 | PEM water electrolytic tank |
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| Publication Number | Publication Date |
|---|---|
| CN218989415U true CN218989415U (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223039086.8U Active CN218989415U (en) | 2022-11-14 | 2022-11-14 | PEM water electrolytic tank |
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| CN (1) | CN218989415U (en) |
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- 2022-11-14 CN CN202223039086.8U patent/CN218989415U/en active Active
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