CN116544474A - Electrode protection structure and protection method of flow battery - Google Patents
Electrode protection structure and protection method of flow battery Download PDFInfo
- Publication number
- CN116544474A CN116544474A CN202310624008.4A CN202310624008A CN116544474A CN 116544474 A CN116544474 A CN 116544474A CN 202310624008 A CN202310624008 A CN 202310624008A CN 116544474 A CN116544474 A CN 116544474A
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- Prior art keywords
- electrode
- protection
- protective film
- edge
- flow battery
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 18
- 238000007086 side reaction Methods 0.000 abstract description 7
- 230000005518 electrochemistry Effects 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/8663—Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8694—Bipolar electrodes
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Fuel Cell (AREA)
Abstract
The invention belongs to the technical field of electrochemistry, and discloses a flow battery electrode protection structure and a protection method. The flow battery electrode protection structure comprises an electrode (1) and a protection film (2), wherein the protection film (2) is attached to at least one side of the electrode (1), and the protection film (2) extends from the edge of the electrode (1) to the center of the electrode (1). According to the invention, the edge of the electrode (1) is provided with a layer of protective film (2) attached to the electrode (1), and the protective film (2) can play two roles: first, the edge region of the electrode is protected from damage due to the occurrence of undesired side reactions. Second, physical impact on the electrodes and bipolar plates in contact with the electrodes due to the high electrolyte flow rate can be avoided near the electrolyte inlet.
Description
Technical Field
The invention belongs to the technical field of electrochemistry, and particularly relates to an electrode protection structure of a flow battery, a composite bipolar plate and a flow battery comprising the electrode protection structure, and an electrode protection method.
Background
The flow battery is an electrochemical energy storage system, can convert electric energy generated by a voltage fluctuation type power generation system such as wind power, photovoltaic and the like into chemical energy for large-scale storage, and can externally output to a user or supply to a power grid system in a voltage stabilization mode after passing through a specific output circuit.
In order to uniformly distribute electrolyte to each electrode, a flow battery is generally provided with a common pipeline, but the electrolyte inlet is generally far smaller than the width of the electrode, so that the electrolyte can undergo a redistribution process after entering the electrode, and the following problems exist in the following way: 1. the electrode of the flow battery usually adopts a carbon felt, and is a porous electrode material, the electrode material has larger pressure loss, electrolyte at the periphery of the electrode can be caused, the flow rate is lower than the designed flow rate due to friction resistance with the edge of the electrode, when electrochemical reaction of charge and discharge is carried out, the electrolyte particles at the edge position of the electrode are insufficient due to the lower flow rate, unwanted electrochemical side reactions such as water electrolysis reaction and the like occur, destructive gases such as hydrogen, oxygen and the like are generated, and the electrode is damaged. 2. Near the electrolyte inlet of the electrode, the flow velocity of the electrolyte is high, and physical impact is easily generated on the electrode and the bipolar plate contacted with the electrode, so that the electrode or the bipolar plate at the electrolyte inlet is damaged.
The present invention has been made to solve the above problems.
Disclosure of Invention
The first aspect of the invention provides a flow battery electrode protection structure, which comprises an electrode 1 and a protection film 2, wherein at least one side of the electrode 1 is attached with the protection film 2, and the protection film 2 extends from the edge of the electrode 1 to the center of the electrode 1. That is, the electrode 1 may have the protective film 2 attached to only one side, or may have the protective film 2 attached to both sides. The electrode 1 to which the protective film 2 is attached may be used as a composite electrode.
Preferably, when the protective film 2 is attached to only one side of the electrode 1, the protective film 2 may be located on the side of the electrode 1 close to the bipolar plate 3 or on the side of the electrode 1 away from the bipolar plate 3. More preferably, the protective film 2 is located on the side of the electrode 1 adjacent to the bipolar plate 3.
Preferably, the protective film 2 extends from the edge of the electrode 1 to the center of the electrode 1 by 0 to 20mm, and is not 0.
Preferably, the thickness of the protective film 2 is 0.01-1mm, and is not 0.
Preferably, the protective film 2 is selected from one or more of PVC, PP and ABS.
Preferably, the protective film 2 is fixed to the electrode 1 by adhesive bonding.
A second aspect of the invention provides a composite bipolar plate for a flow battery comprising a bipolar plate 3 and an electrode protection structure according to the first aspect of the invention.
A third aspect of the invention provides a flow battery comprising a composite bipolar plate according to the second aspect of the invention.
A fourth aspect of the present invention provides a method for protecting an electrode of a flow battery, comprising providing a protective film 2 on a surface of one side of an electrode 1, and extending the protective film 2 from an edge of the electrode 1 toward a center of the electrode 1.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention arranges a layer of protective film 2 attached to the electrode 1 at the edge of the electrode 1, and the protective film 2 has two functions: first, the edge region of the electrode is protected from damage due to the occurrence of undesired side reactions. Second, physical impact on the electrodes and bipolar plates in contact with the electrodes due to the high electrolyte flow rate can be avoided near the electrolyte inlet. The size of the bipolar plate is larger than that of the electrode in the flow battery, and the protective film is arranged on the edge of the electrode, namely, the protective film is not arranged on the edge of the bipolar plate, so that the problem is well solved by arranging the protective film on the electrode because the insufficient edge flow rate of the electrode and the too fast electrolyte inlet flow rate can damage the electrode.
2. The protective film 2 extends from the edge of the electrode 1 to the center of the electrode 1 by 0-20mm, the design of the width of the protective film 2 depends on the width of the area with insufficient electrolyte flow rate, and the width of the protective film 2 is set to be 0-20mm, so that more areas where the electrode can be electrified can be reserved as much as possible on the premise of double protection of the electrode, and the waste of electrode cost is avoided.
Drawings
FIG. 1 is a schematic view of areas of insufficient flow rate, where the marginal green and blue areas (non-red areas) indicate a lower than designed flow rate, which are susceptible to side reactions.
FIG. 2 is a schematic diagram of the area of excessive flow velocity, where the green area (non-blue area) represents more than 50% above the design flow velocity, which is subject to physical damage.
Fig. 3 is a schematic view of an electrode protection structure.
Fig. 4 is a cross-sectional view of an electrode protection structure.
Fig. 5 is a schematic view of a composite bipolar plate structure.
Reference numerals in the description of the drawings: 1-electrode, 2-protective film, 3-bipolar plate.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wireless connections.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. The orientation or state relationship indicated by the terms "inner", "upper", "lower", etc. are orientation or state relationship based on the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "provided" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention is understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in FIG. 1, the areas of insufficient flow rate are schematically represented by the marginal green and blue areas (non-red areas) which are below the design flow rate and are susceptible to side reactions. When the electrochemical reaction of charge and discharge is performed, the electrolyte particles at the edge of the electrode are insufficient due to the low flow rate, and undesirable electrochemical side reactions such as water electrolysis reaction and the like occur, and destructive gases such as hydrogen, oxygen and the like are generated, so that the electrode is damaged.
As shown in fig. 2, the flow velocity is too high, and the green area (non-blue area) in the diagram indicates that the flow velocity exceeds the design flow velocity by more than 50%, and physical impact is easily generated on the electrode and the bipolar plate contacted with the electrode, so that the electrode or the bipolar plate at the liquid inlet is damaged.
As shown in fig. 3-4, an electrode protection structure of the flow battery of the present embodiment includes an electrode 1 and a protection film 2, wherein the protection film 2 is attached to the electrode 1 and extends from the edge of the electrode 1 to the center of the electrode 1.
The protective film 2 is located on the side of the electrode 1 adjacent to the bipolar plate 3.
The protective film 2 extends 10mm from the edge of the electrode 1 toward the center of the electrode 1.
The thickness of the protective film 2 was 0.02mm.
The protective film 2 is selected from PVC.
The protective film 2 is fixed to the electrode 1 by adhesive bonding.
In this embodiment, a layer of protective film 2 attached to the electrode 1 is disposed on the edge of the electrode 1, and the protective film 2 has two functions: first, the edge region of the electrode is protected from damage due to the occurrence of undesired side reactions. Second, physical impact on the electrodes and bipolar plates in contact with the electrodes due to the high electrolyte flow rate can be avoided near the electrolyte inlet.
As shown in fig. 5, the bipolar plate is larger than the electrode in the flow battery, and the protective film is arranged on the edge of the electrode, that is, the protective film is not arranged on the edge of the bipolar plate, so that the problem is solved by the invention, namely, the problem that the electrode is damaged due to insufficient edge flow rate of the electrode and too fast electrolyte inlet flow rate is solved by the invention.
Claims (9)
1. The electrode protection structure of the flow battery is characterized by comprising an electrode (1) and a protection film (2), wherein the protection film (2) is attached to at least one side of the electrode (1), and the protection film (2) extends from the edge of the electrode (1) to the center of the electrode (1).
2. The electrode protection structure according to claim 1, characterized in that when the protective film (2) is attached to one side of the electrode (1), the protective film (2) is located on the side of the electrode (1) close to the bipolar plate (3).
3. Electrode protection structure according to claim 1, characterized in that the protection film (2) extends from the edge of the electrode (1) to the centre of the electrode (1) by 0-20mm and not 0.
4. Electrode protection structure according to claim 1, characterized in that the thickness of the protection film (2) is 0.01-1mm and not 0.
5. Electrode protection structure according to claim 1, characterized in that the protection film (2) is selected from one or several of PVC, PP, ABS.
6. Electrode protection structure according to claim 1, characterized in that the protection film (2) is fixed to the electrode (1) by means of adhesive bonding.
7. A composite bipolar plate for a flow battery, characterized in that it comprises a bipolar plate (3) and an electrode protection structure according to any one of claims 1-5.
8. A flow battery comprising the composite bipolar plate of claim 7.
9. A method for protecting an electrode of a flow battery, characterized in that a protective film (2) is provided on a surface of one side of an electrode (1), and the protective film (2) is extended from an edge of the electrode (1) toward a center of the electrode (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310624008.4A CN116544474A (en) | 2023-05-30 | 2023-05-30 | Electrode protection structure and protection method of flow battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310624008.4A CN116544474A (en) | 2023-05-30 | 2023-05-30 | Electrode protection structure and protection method of flow battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116544474A true CN116544474A (en) | 2023-08-04 |
Family
ID=87452415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310624008.4A Pending CN116544474A (en) | 2023-05-30 | 2023-05-30 | Electrode protection structure and protection method of flow battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116544474A (en) |
-
2023
- 2023-05-30 CN CN202310624008.4A patent/CN116544474A/en active Pending
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