CN108550885B - Electrode frame for all-vanadium redox flow battery - Google Patents
Electrode frame for all-vanadium redox flow battery Download PDFInfo
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- CN108550885B CN108550885B CN201810671714.3A CN201810671714A CN108550885B CN 108550885 B CN108550885 B CN 108550885B CN 201810671714 A CN201810671714 A CN 201810671714A CN 108550885 B CN108550885 B CN 108550885B
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- electrode
- liquid outlet
- liquid inlet
- anode liquid
- electrode frame
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 141
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 239000003014 ion exchange membrane Substances 0.000 claims abstract description 35
- 239000011229 interlayer Substances 0.000 claims abstract description 24
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000007334 copolymerization reaction Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- 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
Abstract
The invention mainly discloses an electrode frame for an all-vanadium redox flow battery, which comprises the following technical scheme: the electrode frame comprises an electrode frame body, wherein an electrode cavity is arranged in the middle of the electrode frame body, an anode liquid inlet, an anode liquid outlet, an anode liquid inlet and an anode liquid outlet are respectively formed in four corners of the electrode frame body, the anode liquid inlet is sequentially connected with an anode liquid inlet main runner, an anode liquid inlet first sub runner and an anode liquid inlet interlayer runner, the anode liquid outlet is sequentially connected with an anode liquid outlet main runner, an anode liquid outlet first sub runner and an anode liquid outlet interlayer runner, an ion exchange membrane is arranged on the back surface of the electrode frame body, sealing grooves are formed in the edges around the anode liquid inlet, the anode liquid outlet, the electrode cavity and the ion exchange membrane, sealing strips are arranged at the sealing grooves, and the periphery of the ion exchange membrane is fixed through the sealing strips. The distribution uniformity of electrolyte can be improved, the reaction efficiency of the battery is improved, the leakage current and the thickness of a galvanic pile are reduced by the split type sealing design, the assembly working procedure is reduced, the assembly difficulty is reduced, and the galvanic pile cost is reduced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electrode frame for an all-vanadium redox flow battery.
Background
The all-vanadium redox flow battery operates at normal temperature and normal pressure, is safe and reliable, and can not explode and burn even if the positive and negative electrolyte are mixed; the cycle life is long, deep charge and discharge can be realized, the charge and discharge characteristics are good, the response speed is high, and the energy efficiency is high; the electrochemical reversibility of vanadium ions is high, the electrochemical polarization is small, and the method is suitable for high-current rapid charge and discharge; the power and the capacity are respectively determined by the quantity of the battery cells and the electrolyte, so that the power and the capacity can be independently designed, and the design is flexible; the electrolyte is environment-friendly, and can be recycled and reused. All-vanadium redox flow battery mainly assembles the components such as an electrode, a bipolar plate, an ion exchange membrane and the like into a galvanic pile through an electrode frame. The electrode frame is a carrier of electrode materials and bipolar plate materials and also provides a flow channel for electrolyte, so that the electrode frame becomes a carrier of electrochemical reaction, and therefore, the structural design of the electrode frame plays a vital role in the performance and operation of a galvanic pile. The excellent electrode frame structural design not only can reduce the volume of a galvanic pile, but also can improve the distribution uniformity of electrolyte at the electrode, thereby improving the reaction efficiency of the battery, reducing the waste of raw materials, reducing the cost of the galvanic pile and being beneficial to industrialization.
The existing all-vanadium redox flow battery has large volume, the distribution of electrolyte is easy to be uneven, and the performance of a battery system is influenced; some electrode frames are designed to require more ion exchange membranes and bipolar plates, so that the production cost is increased; and the ion exchange membrane and the bipolar plate are required to be perforated during processing and assembling, so that the battery production operation procedure is increased, and the industrialization of a battery system is not facilitated.
Disclosure of Invention
Aiming at the defects existing in the prior art, the electrode frame for the all-vanadium redox flow battery is simple in structure, can improve the distribution uniformity of electrolyte, and improves the reaction efficiency and the energy efficiency of the battery; the split type sealing design can reduce leakage current, stack thickness and raw material use quantity, simplify production procedures and reduce production cost.
In order to achieve the above purpose, the present invention is realized by the following technical scheme: the utility model provides an electrode frame for all vanadium redox flow battery, includes the electrode frame main part, is provided with the electrode chamber for placing the electrode in the middle of the electrode frame main part, electrode frame main part four corners is equipped with anodal inlet, anodal liquid outlet, negative pole inlet and negative pole liquid outlet respectively, anodal inlet and anodal liquid outlet are diagonal relation, negative pole inlet and negative pole liquid outlet are diagonal relation, anodal inlet has connected gradually positive pole inlet sprue, anodal inlet first subchannel and anodal liquid intermediate layer runner that are located the positive pole inlet sprue of electrode frame main part, anodal liquid outlet first subchannel and anodal liquid intermediate layer runner that are located the positive pole outlet sprue, anodal liquid outlet first subchannel and anodal liquid intermediate layer runner of electrode frame main part in proper order, electrode frame main part reverse side is equipped with the ion exchange membrane, anodal inlet, anodal liquid outlet, electrode chamber and ion exchange membrane all are equipped with the seal groove, seal groove department is equipped with the sealing strip, the ion exchange membrane is fixed through the sealing strip all around.
The invention further comprises the following steps: the range of the sealing strips at the peripheral edges of the positive electrode liquid inlet and the positive electrode liquid outlet is not more than the central line of the electrode frame main body.
The invention further comprises the following steps: four sides of the ion exchange membrane exceed the sealing strip, but do not cover the positive electrode liquid inlet, the positive electrode liquid outlet, the negative electrode liquid inlet and the negative electrode liquid outlet. Because the sealing strip is regular in shape and has a certain distance with the liquid inlet and outlet, the ion exchange membrane does not need to be perforated, so that the material waste is reduced, the assembly procedure is reduced, the assembly difficulty is reduced, and the ion exchange membrane is fixed through the sealing strip and the sealing groove.
The invention further comprises the following steps: the structure of the positive electrode liquid inlet interlayer runner is the same as that of the positive electrode liquid outlet interlayer runner, and the positive electrode liquid inlet interlayer runner and the positive electrode liquid outlet interlayer runner are both provided with second sub runners, and the groove depth of the second sub runners is larger than that of the positive electrode liquid inlet first sub runners or the positive electrode liquid outlet first sub runners. The groove depths of the grooves have a certain fall.
The invention further comprises the following steps: the electrode frame main body is made of polymer materials with good chemical corrosion resistance and molding processability, such as copolymer PP, HDPE, LLDPE, PVC, PVDF.
The invention further comprises the following steps: the thickness of the electrode frame body is 2-15mm.
The invention further comprises the following steps: the first sub-flow channels of the positive electrode liquid inlet and the first sub-flow channels of the positive electrode liquid outlet are divided into small flow channels at uniform intervals, so that the distribution uniformity of the electrolyte is improved.
The invention has the beneficial effects that:
the appearance of the electrode frame main body is a rectangular thin plate, the four corners of the electrode frame main body are respectively provided with an anode liquid inlet, an anode liquid outlet, a cathode liquid inlet and a cathode liquid outlet, no matter whether the liquid inlet or the liquid outlet of the anode is connected with an anode liquid inlet/outlet main runner, an anode liquid inlet/outlet sub-runner and an anode liquid inlet/outlet interlayer runner, and electrolyte can be uniformly distributed on the electrode after passing through the sub-runners.
The positive electrode liquid inlet, the positive electrode liquid outlet, the electrode cavity and the periphery edge of the ion exchange membrane are all provided with sealing grooves, sealing strips are arranged at the sealing grooves, the electrode frame main body seals all the positions by the sealing strips, and the electrolyte does not contact the ion exchange membrane on a runner before flowing into the electrode in a split type sealing manner, so that leakage current on the ion exchange membrane is greatly reduced.
Because the sealing strip is regular in shape and has a certain distance with the liquid inlet and outlet, the ion exchange membrane does not need to be perforated, so that the material waste is reduced, the assembly procedure is reduced, the assembly difficulty is reduced, and the ion exchange membrane is fixed by connecting the sealing strip with the sealing groove.
The invention has simple structure, improves the distribution uniformity of electrolyte, improves the reaction efficiency and the energy efficiency of the battery, adopts the design of split type sealing to reduce leakage current and the thickness of a galvanic pile, reduces the assembly difficulty and reduces the cost of the galvanic pile.
Drawings
FIG. 1 is a schematic diagram of the front structure of an electrode frame body according to the present invention;
FIG. 2 is a partial schematic view of the present invention;
FIG. 3 is a schematic view of the structure of the electrode frame body of the present invention;
FIG. 4 is a schematic cross-sectional view of a second sub-channel on an electrode frame body according to the present invention;
FIG. 5 is a schematic diagram of a second runner structure according to the present invention.
Reference numerals: 1. an electrode cavity; 2. an ion exchange membrane; 3. a sealing strip; 5. a second shunt; 11. a positive electrode liquid inlet; 12. a positive electrode liquid outlet; 13. a negative electrode liquid inlet; 14. a negative electrode liquid outlet; 21. a positive electrode liquid inlet main flow channel; 22. the positive electrode liquid inlet first sub-flow channel; 23. an anode liquid inlet interlayer runner; 24. the positive pole goes out liquid sprue, 25, positive pole goes out liquid first subchannel, 26, positive pole goes out liquid intermediate layer runner.
Detailed Description
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
The electrode frame for the vanadium redox flow battery as shown in fig. 1-4 comprises an electrode frame main body, wherein the electrode frame main body is in a rectangular thin plate shape, the thickness of the electrode frame main body is 7mm, an electrode cavity 1 for placing an electrode is arranged in the middle of the electrode frame main body, a positive electrode liquid inlet 11, a positive electrode liquid outlet 12, a negative electrode liquid inlet 13 and a negative electrode liquid outlet 14 are respectively arranged at four corners of the electrode frame main body, the positive electrode liquid inlet 11 and the positive electrode liquid outlet 12 are in a diagonal relationship, the negative electrode liquid inlet 13 and the negative electrode liquid outlet 14 are in a diagonal relationship, the positive electrode liquid inlet 11 is sequentially connected with a positive electrode liquid inlet main flow channel 21, a positive electrode liquid inlet first sub-flow channel 22 and a positive electrode liquid inlet interlayer flow channel 23 which are positioned on the front surface of the electrode frame main body, and the positive electrode liquid outlet 12 is sequentially connected with a positive electrode liquid outlet main flow channel 24, a positive electrode liquid outlet first sub-flow channel 25 and a positive electrode liquid outlet interlayer flow channel 26. The first positive electrode liquid inlet sub-channel 22 and the first positive electrode liquid outlet sub-channel 25 are divided into small channels at uniform intervals, so that the distribution uniformity of electrolyte is improved, and the reaction efficiency and the energy efficiency of the battery are improved. The structure of the positive liquid inlet interlayer runner 23 is the same as that of the positive liquid outlet interlayer runner 26, and the positive liquid inlet interlayer runner and the positive liquid outlet interlayer runner are both provided with second sub runners 5, the groove depth of the second sub runners 5 is larger than that of the positive liquid inlet first sub runner 22 or the positive liquid outlet first sub runner 25, and the groove depths of the positive liquid inlet interlayer runner and the positive liquid outlet interlayer runner have a certain fall.
The back surface of the electrode frame main body is provided with an ion exchange membrane 2, sealing grooves are formed in the edges of the periphery of the positive electrode liquid inlet 11, the periphery of the positive electrode liquid outlet 12, the periphery of the electrode cavity 1 and the periphery of the ion exchange membrane 2, sealing strips 3 are arranged at the sealing grooves, the sealing strips 3 are placed in the sealing grooves which are opened in advance, and the periphery of the ion exchange membrane 2 is fixed through the sealing strips 3. The range of the sealing strips 3 at the peripheral edges of the positive electrode liquid inlet 11 and the positive electrode liquid outlet 12 is not more than the central line of the electrode frame main body. Four sides of the ion exchange membrane 2 exceed the sealing strip 3, but do not cover the positive electrode liquid inlet 11, the positive electrode liquid outlet 12, the negative electrode liquid inlet 13 and the negative electrode liquid outlet 14. Because sealing strip 3 shape is regular and have certain interval with the business turn over liquid mouth, ion exchange membrane 2 need not punch to reduce the material extravagant, reduce the equipment process, reduce the equipment difficulty, be connected with sealing groove through sealing strip 3 and sealing groove and fix ion exchange membrane 2, and sealing strip 3 seals the electrolyte flow passage area that covers under the ion exchange membrane 2. The electrode frame main body is made of polymer materials with good chemical corrosion resistance and molding processability, such as copolymer PP, HDPE, LLDPE, PVC, PVDF.
The two electrode frame bodies are an anode electrode frame body and a cathode electrode frame body, the structural designs of the two electrode frame bodies are completely consistent, the specific structure on the anode electrode frame body is described in the embodiment, all the liquid inlets/outlets of the anode electrode frame body and the cathode electrode frame body are aligned, and one side of the two electrode frame bodies, where the ion exchange membrane 2 is placed, is positioned at the inner side of the assembly. In actual operation, electrolyte enters through the positive electrode liquid inlet 11, then flows to the positive electrode liquid inlet main runner 21, the positive electrode liquid inlet first sub runner 22, the positive electrode liquid inlet interlayer runner 23 and the second sub runner 5 in sequence, is uniformly distributed into the electrode cavity 1 through the second sub runner 5, and after reacting in the electrode cavity 1, sequentially flows through the second sub runner 5, the positive electrode liquid outlet interlayer runner 26, the positive electrode liquid outlet first sub runner 25 and the positive electrode liquid outlet main runner 24, and finally flows out from the positive electrode liquid outlet 12; the inflow and outflow of the electrolyte from the anode liquid inlet 13 and the anode liquid outlet 14 are the same as in the above order. Electrolyte can evenly distributed on the electrode after passing through the runner, reduces electrochemical polarization, improves reaction efficiency, anodal inlet 11, anodal liquid outlet 12, electrode chamber 1 and ion exchange membrane 2 all are equipped with the seal groove all around edge, seal groove department is equipped with sealing strip 3, and electrode frame main part seals everywhere with sealing strip 3 to adopt split type sealed mode, electrolyte does not contact ion exchange membrane 2 on the runner before flowing into the electrode, thereby significantly reduce the leakage current on the ion exchange membrane 2.
Because the sealing strip 3 is regular in shape and has a certain distance with the liquid inlet and outlet, the ion exchange membrane 2 does not need to be perforated, so that the material waste is reduced, the assembly difficulty is reduced, and the ion exchange membrane 2 is fixed by connecting the sealing strip 3 with the sealing groove. The invention has simple structure, improves the distribution uniformity of electrolyte, improves the reaction efficiency and the energy efficiency of the battery, and reduces leakage current and the thickness of a pile by adopting a split type sealing design; reducing assembly procedures, reducing assembly difficulty and reducing galvanic pile cost.
The above embodiments are only for illustrating the inventive concept of the present invention and not for limiting the protection of the claims of the present invention, and all the insubstantial modifications of the present invention using the concept shall fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides an electrode frame for all vanadium redox flow battery, includes electrode frame main part, is provided with electrode cavity (1) for placing the electrode in the middle of the electrode frame main part, its characterized in that: the electrode frame comprises an electrode frame body, wherein four corners of the electrode frame body are respectively provided with an anode liquid inlet (11), an anode liquid outlet (12), a cathode liquid inlet (13) and a cathode liquid outlet (14), the anode liquid inlet (11) and the anode liquid outlet (12) are in diagonal relation, the cathode liquid inlet (13) and the cathode liquid outlet (14) are in diagonal relation, the anode liquid inlet (11) is sequentially connected with an anode liquid inlet main flow channel (21), an anode liquid inlet first sub-flow channel (22) and an anode liquid inlet interlayer flow channel (23) which are positioned on the front of the electrode frame body, the anode liquid outlet (12) is sequentially connected with an anode liquid outlet main flow channel (24), an anode liquid outlet first sub-flow channel (25) and an anode liquid outlet interlayer flow channel (26) which are positioned on the front of the electrode frame body, the electrode frame body is provided with an ion exchange membrane (2), the anode liquid inlet (11), the anode liquid outlet (12), an electrode cavity (1) and the periphery of the ion exchange membrane (2) are sequentially provided with sealing grooves, and the periphery of the ion exchange membrane (3) is fixedly arranged around the sealing strips (3);
the range of the sealing strips (3) at the peripheral edges of the positive electrode liquid inlet (11) and the positive electrode liquid outlet (12) is not more than the central line of the electrode frame main body;
four sides of the ion exchange membrane (2) exceed the sealing strip (3), but do not cover the positive electrode liquid inlet (11), the positive electrode liquid outlet (12), the negative electrode liquid inlet (13) and the negative electrode liquid outlet (14);
the structure of the positive electrode liquid inlet interlayer runner (23) is the same as that of the positive electrode liquid outlet interlayer runner (26), and the positive electrode liquid inlet interlayer runner and the positive electrode liquid outlet interlayer runner are both provided with second sub runners (5), and the groove depth of the second sub runners (5) is larger than that of the positive electrode liquid inlet first sub runner (22) or the positive electrode liquid outlet first sub runner (25).
2. The electrode frame for an all-vanadium redox flow battery according to claim 1, wherein: the electrode frame main body is made of a polymer material with better chemical corrosion resistance and molding processability by copolymerization PP, HDPE, LLDPE, PVC, PVDF.
3. The electrode frame for an all-vanadium redox flow battery according to claim 2, wherein: the thickness of the electrode frame body is 2-15mm.
4. The electrode frame for an all-vanadium redox flow battery according to claim 1, wherein: the positive electrode liquid inlet first sub-runner (22) and the positive electrode liquid outlet first sub-runner (25) are divided into small runners at uniform intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810671714.3A CN108550885B (en) | 2018-06-26 | 2018-06-26 | Electrode frame for all-vanadium redox flow battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810671714.3A CN108550885B (en) | 2018-06-26 | 2018-06-26 | Electrode frame for all-vanadium redox flow battery |
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| Publication Number | Publication Date |
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| CN108550885A CN108550885A (en) | 2018-09-18 |
| CN108550885B true CN108550885B (en) | 2024-03-15 |
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| CN201810671714.3A Active CN108550885B (en) | 2018-06-26 | 2018-06-26 | Electrode frame for all-vanadium redox flow battery |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970634B (en) * | 2018-09-29 | 2023-07-07 | 中国科学院大连化学物理研究所 | Electrode frame for all-vanadium redox flow battery and application |
| CN113823806B (en) * | 2020-06-19 | 2023-02-03 | 中国科学院大连化学物理研究所 | Integrated electrode frame structure for all-vanadium redox flow battery, preparation method and application |
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| US6875535B2 (en) * | 2002-04-15 | 2005-04-05 | Hydrogenics Corporation | Manifold for a fuel cell system |
| US20160049674A1 (en) * | 2011-09-08 | 2016-02-18 | Sharp Kabushiki Kaisha | Fuel cell stack, fuel cell stack composite, and fuel cell system |
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|---|---|---|---|---|
| CN101847724A (en) * | 2010-03-31 | 2010-09-29 | 清华大学 | Bipolar plate frame and galvanic pile of flow battery |
| CN102034993A (en) * | 2010-11-19 | 2011-04-27 | 清华大学深圳研究生院 | Frame for liquid flow battery electrode |
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| CN108550885A (en) | 2018-09-18 |
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