CN115101770A - Flow battery composite bipolar plate and processing technology thereof - Google Patents
Flow battery composite bipolar plate and processing technology thereof Download PDFInfo
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- CN115101770A CN115101770A CN202210647168.6A CN202210647168A CN115101770A CN 115101770 A CN115101770 A CN 115101770A CN 202210647168 A CN202210647168 A CN 202210647168A CN 115101770 A CN115101770 A CN 115101770A
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0213—Gas-impermeable carbon-containing materials
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0221—Organic resins; Organic polymers
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0228—Composites in the form of layered or coated products
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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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
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Abstract
The application relates to the technical field of energy storage, and discloses a flow battery composite bipolar plate and a processing technology thereof, wherein the flow battery composite bipolar plate comprises the following steps: alternately laying vermicular graphite layers and polymer material layers in a compression molding machine mould, heating and then pressing to form a flexible substrate; installing a die for pressing a runner on a roller press; laying carbon felts on the upper and lower sides of the flexible substrate which is formed by pressing, then immediately sending the flexible substrate into a roller press, and placing the flexible substrate aside for natural cooling after pressing; and warehousing and storing after the inspection is qualified. According to the composite bipolar plate, the flexible substrate and the electrode are combined together in a rolling mode, so that the electrode and the bipolar plate are tightly combined, the pores of the composite bipolar plate are reduced, the flexibility of the flexible substrate is combined with the conductivity of the electrode, the effect of separating positive electrolyte from negative electrolyte is achieved, and good flexibility is achieved so as to facilitate installation and use.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a flow battery composite bipolar plate and a processing technology thereof.
Background
With the gradual exhaustion of traditional energy sources and corresponding environmental problems, the utilization of renewable energy sources such as wind energy and solar energy has attracted people's extensive attention and has been developed rapidly, and meanwhile, in order to ensure the stable power supply of the renewable energy sources and overcome the inherent problems, more and more electric storage and energy storage technologies are developed and used, wherein a flow battery is used as a solution for large-scale energy storage technologies, compared with other energy storage technologies, the flow battery has the advantages of large power, large capacity, high energy conversion efficiency, long service life, high safety, environmental protection and the like, has wide application prospects in the fields of large-scale energy storage systems matched with photovoltaic power generation and wind power generation, smart grid peak shaving, communication base stations, distributed power supplies and the like, and becomes a key development object of various countries in the world.
The bipolar plate and the carbon material electrode are very important key materials of the redox flow energy storage battery, the bipolar plate is used for isolating positive and negative electrolytes and conducting current at the same time, and the carbon material electrode is used as an electrode in the redox flow energy storage battery and has good electrochemical activity and reversibility. At present, chinese patent publication No. CN102569824A discloses an integrated composite electrode bipolar plate, and a preparation method and an application thereof, wherein the integrated composite electrode bipolar plate is composed of an integrated graphite felt/carbon felt and a plastic sheet, the plastic sheet is embedded between two sheets of graphite felt/carbon felt, and both the long axis and the wide axis of the plastic sheet are greater than those of the graphite felt/carbon felt. The preparation method of the integrated composite electrode bipolar plate comprises the following steps: and heating and extruding the plastic particles to form a softened plastic sheet, placing the plastic sheet between two graphite felts/carbon felts, closing the mold, heating and extruding, dissolving the plastic sheet into the graphite felts/carbon felts, and cooling to obtain the integrated composite electrode bipolar plate. The preparation method has the following defects:
the graphite felt is completely dissolved in the middle plastic sheet, the original plastic property of the plastic sheet is seriously reduced due to the vulnerability of the graphite felt after the graphite felt is dissolved in the plastic sheet, the plastic sheet becomes very fragile, the plastic sheet is easy to carbonize and decompose, the graphite felt is very easy to fracture due to the overlarge pressure born by the graphite felt, the charging and discharging performance of the graphite felt is very poor, and the composite electrode bipolar plate is easy to crack; in addition, the plastic sheet is easily fiberized by the graphite felt, which is known as a glue-climbing phenomenon in the industry, and at the moment, the middle plastic sheet can generate a plurality of through holes, so that the positive and negative electrolyte can not be blocked, and the battery can lose efficacy after being assembled.
In view of the above-described related art, the inventors have considered that there is a defect that the battery is liable to fail to be mounted or to fail within a short time after being mounted. Therefore, a flow battery composite bipolar plate and a processing technology thereof are needed, which can well separate the positive electrolyte from the negative electrolyte and have good flexibility for installation and use.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a flow battery composite bipolar plate and a processing technology thereof.
In a first aspect, the flow battery composite bipolar plate provided by the present application adopts the following technical scheme:
the flow battery composite bipolar plate comprises a flexible substrate and two layers of electrodes, wherein the flexible substrate is formed by compounding a plurality of layers of vermicular graphite and a plurality of layers of high polymer materials, the flexible substrate is positioned between the two layers of electrodes, and the flexible substrate and the electrodes are formed in a rolling and compounding mode.
The vermicular graphite is a product of expanded graphite, is loose and porous, and can be automatically embedded among the vermicular graphite, so that the vermicular graphite has the corrosion resistance of natural graphite and has some properties which are not possessed by the natural graphite, such as flexibility, compression resilience, adsorptivity, plasticity, aging resistance, self-adhesiveness and the like; by adopting the technical scheme, the vermicular graphite and the high polymer material are compounded into the flexible substrate, the high polymer material is deeply fused due to the looseness and the porosity of the vermicular graphite, the flexibility and the toughness of the vermicular graphite and the high polymer material are combined, the flexible substrate and the electrode are combined together in a rolling mode, the tight combination of the electrode and the bipolar plate is realized, the pores of the composite bipolar plate are reduced, the flexibility of the flexible substrate is combined with the conductivity of the electrode, the effect of separating the positive electrolyte from the negative electrolyte is achieved, and the flexible bipolar plate has good flexibility so as to be convenient to mount and use.
Preferably, the mesh number of the vermicular graphite is between 30 and 200.
Preferably, the polymer material is one or more polymers of PE, PP, PVDF and ETFE.
Preferably, the electrode is a carbon felt.
The traditional electrode has larger thickness, the minimum thickness is 4mm, one electric pile is composed of a plurality of single cells, each single cell contains an electrode, and therefore the volume of the assembled electric pile is larger. The carbon felt is used as a carbon material electrode, the mechanical strength is high, the thickness is smaller compared with the thickness of the traditional electrode, the size of a battery stack is greatly reduced, and the space utilization rate of the energy storage battery is improved.
However, since the carbon felt is thin, the carbon felt is easily wrinkled and deformed due to the flow of the electrolyte in the battery. According to the invention, the carbon material electrode and the bipolar plate are compounded together, so that the flexibility and resilience are enhanced, and the problem of deformation of the carbon material electrode is solved.
Preferably, the surface of the electrode is provided with a flow channel, and the flow channel extends in a snake shape.
By adopting the technical scheme, the using area of the electrode is increased by utilizing the flow channel, so that the reaction area of the galvanic pile is increased, and the performance of the galvanic pile is improved.
Preferably, the surface of the flow channel parallel to the electrode surface is provided with a concave-convex, and the cross section of the flow channel extends in a snake shape.
Through adopting above-mentioned technical scheme, unsmooth design has further increased the usable floor area of electrode, has further improved the performance of galvanic pile.
The snakelike extension design improves the performance of the pile, reduces the thickness of the carbon felt required by the reaction and further reduces the thickness of the composite bipolar plate; and the carbon felt and the flexible substrate are combined favorably, the electrolyte is prevented from overflowing from the flow channel due to the tight combination of the carbon felt and the flexible substrate, and the service life of the flow battery is ensured favorably.
In a second aspect, the present application provides a processing technology for a flow battery composite bipolar plate, which adopts the following technical scheme:
a processing technology of a flow battery composite bipolar plate comprises the following steps:
alternately laying vermicular graphite layers and polymer material layers in a compression molding machine mould, heating and then pressing to form a flexible substrate;
installing a die for pressing a flow channel on a roller press;
laying carbon felts on the upper and lower sides of the flexible substrate which is formed by pressing, then immediately sending the flexible substrate into a roller press, and placing the flexible substrate aside for natural cooling after pressing;
and warehousing and storing after the inspection is qualified.
Through adopting above-mentioned technical scheme, lay worm form graphite layer and macromolecular material layer crisscross to this accelerates the integration of both performances, and the flexible substrate after the hot pressing combines with the carbon felt under the effect of roll squeezer, make full use of the hot press remain the waste heat in the flexible substrate, reduced energy loss, improved suppression efficiency.
Preferably, the mold is a roll shaft, and a processing groove matched with the flow channel is printed on the roll shaft.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the scheme, the vermicular graphite and the high polymer material are compounded into the flexible substrate, the vermicular graphite is loose and porous, the high polymer material can be deeply fused, the flexibility and the toughness of the vermicular graphite and the high polymer material are combined, the flexible substrate and the electrode are combined together in a rolling mode, the tight combination of the electrode and the bipolar plate is realized, the pores of the composite bipolar plate are reduced, the flexibility of the flexible substrate and the conductivity of the electrode are combined, the effect of separating positive electrolyte from negative electrolyte is achieved, and the flexible bipolar plate has good flexibility so as to be convenient to mount and use;
2. the carbon felt is used as a carbon material electrode, has high mechanical strength, is smaller in thickness compared with the traditional electrode, is very favorable for reducing the volume of a battery stack and improving the space utilization rate of the energy storage battery;
3. the flow channel is used for increasing the using area of the electrode, so that the reaction area of the galvanic pile is increased, the performance of the galvanic pile is improved, the thickness of the carbon felt required by reaction is reduced, and the thickness of the composite bipolar plate is further reduced.
Drawings
Fig. 1 is a schematic diagram of a layered structure according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an electrode in the embodiment of the present application.
Description of the reference numerals: 1. a flexible substrate; 2. an electrode; 3. and a flow passage.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses a flow battery composite bipolar plate. As shown in fig. 1, the composite bipolar plate for the flow battery comprises two layers of electrodes 2 and a layer of flexible substrate 1, wherein the flexible substrate 1 is positioned between the two layers of electrodes 2.
As shown in fig. 1 and 2, the electrode 2 is a carbon felt, which has high mechanical strength and smaller thickness compared with the conventional electrode 2, and is very beneficial to reducing the volume of the cell stack and improving the space utilization rate of the energy storage cell. The surface of the electrode 2 is provided with a flow channel 3, and the flow channel 3 extends in a snake shape; the surface of the flow channel 3 parallel to the surface of the electrode 2 is provided with concave-convex parts, and the cross section of the flow channel extends in a snake shape. The flow channel 3 and the concave-convex design can increase the use area of the electrode 2, so that the reaction area of the electric pile is increased, and the performance of the electric pile is improved. The performance of the galvanic pile is improved, meanwhile, the thickness of the carbon felt required by reaction is reduced, and the thickness of the composite bipolar plate is further reduced; and the carbon felt and the flexible substrate 1 are combined favorably, the electrolyte is prevented from overflowing from the flow channel 3 due to the tight combination of the carbon felt and the flexible substrate, and the service life of the flow battery is ensured favorably.
The flexible substrate 1 is formed by compounding a plurality of layers of vermicular graphite and a plurality of layers of polymer materials, the vermicular graphite is a product of expanded graphite, the mesh number of the vermicular graphite selected in the embodiment is between 30 and 200, the vermicular graphite has the characteristics of looseness and porosity, and the vermicular graphite can be automatically embedded, so that the vermicular graphite has the characteristics which are not possessed by natural graphite, such as flexibility, compression resilience, adsorptivity, plasticity, ageing resistance, self-adhesiveness and the like, besides the corrosion resistance of the natural graphite. The high molecular material is one or more of PE, PP, PVDF and ETFE. In this embodiment, a PP material is selected. Because the vermicular graphite is loose and porous, the PP material is deeply fused with the vermicular graphite, thereby combining the softness and toughness of the two.
The flexible substrate 1 and the electrode 2 are formed by rolling and compounding, so that the electrode 2 and the bipolar plate are tightly combined, the pores of the composite bipolar plate are reduced, the flexibility of the flexible substrate 1 is combined with the conductivity of the electrode 2, the effect of separating positive and negative electrolytes is achieved, and the flexible bipolar plate has good flexibility so as to be convenient to mount and use.
The embodiment of the application also discloses a processing technology of the flow battery composite bipolar plate, which comprises the following steps:
the vermicular graphite layers and the high polymer material layers are alternately paved in a compression molding machine mould, and the flexible substrate 1 is formed by compression after heating;
a mould for pressing the runner 3 is arranged on a roller press, a roller shaft is selected as the mould, and a processing groove matched with the runner 3 is printed on the roller shaft;
laying carbon felts on the upper and lower sides of the composite board which is formed by pressing, then immediately feeding the composite board into a roller press, and placing the composite board aside for natural cooling after pressing;
and warehousing and storing after passing the inspection.
The embodiment of this application is crisscross laying worm form graphite layer and macromolecular material layer to this accelerates the fusion of both performances, and the composite sheet after the hot pressing combines with the carbon felt under the effect of roll squeezer, make full use of the hot press remain the waste heat in the composite sheet, reduced energy loss, improved suppression efficiency.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A flow battery composite bipolar plate is characterized in that: the composite electrode comprises a flexible substrate (1) and two layers of electrodes (2), wherein the flexible substrate (1) is formed by compounding a plurality of layers of worm-shaped graphite and a plurality of layers of high polymer materials, the flexible substrate (1) is positioned between the two layers of electrodes (2), and the flexible substrate (1) and the electrodes (2) are formed in a composite mode through rolling.
2. The flow battery composite bipolar plate of claim 1, wherein: the mesh number of the vermicular graphite is between 30 and 200.
3. The flow battery composite bipolar plate of claim 1, wherein: the high polymer material is one or more polymers of PE, PP, PVDF and ETFE.
4. The flow battery composite bipolar plate of claim 1, wherein: the electrode (2) is a carbon felt.
5. The flow battery composite bipolar plate of claim 1, wherein: the surface of the electrode (2) is provided with a flow channel (3), and the flow channel (3) extends in a snake shape.
6. The flow battery composite bipolar plate according to claim 5, wherein: the surface of the flow channel (3) parallel to the surface of the electrode (2) is provided with concave-convex parts, and the section of the flow channel extends in a snake shape.
7. A processing technology of a flow battery composite bipolar plate, which is used for processing the flow battery composite bipolar plate of any one of claims 1 to 6, and is characterized by comprising the following steps:
alternately laying vermicular graphite layers and polymer material layers in a compression molding machine mould, heating and then pressing to form a flexible substrate;
installing a die for pressing a runner on a roller press;
laying carbon felts on the upper and lower sides of the flexible substrate which is formed by pressing, then immediately sending the flexible substrate into a roller press, and placing the flexible substrate aside for natural cooling after pressing;
and warehousing and storing after passing the inspection.
8. The machining process of the flow battery composite bipolar plate as claimed in claim 7, wherein the mold is a roll shaft, and machining grooves matched with the flow channels (3) are printed on the roll shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210647168.6A CN115101770A (en) | 2022-06-08 | 2022-06-08 | Flow battery composite bipolar plate and processing technology thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210647168.6A CN115101770A (en) | 2022-06-08 | 2022-06-08 | Flow battery composite bipolar plate and processing technology thereof |
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| Publication Number | Publication Date |
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| CN115101770A true CN115101770A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210647168.6A Pending CN115101770A (en) | 2022-06-08 | 2022-06-08 | Flow battery composite bipolar plate and processing technology thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728490A (en) * | 2023-08-16 | 2023-09-12 | 沈阳恒久安泰环保与节能科技有限公司 | Carbon felt electrode runner processing method and processing equipment for flow battery and carbon felt electrode |
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2022
- 2022-06-08 CN CN202210647168.6A patent/CN115101770A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728490A (en) * | 2023-08-16 | 2023-09-12 | 沈阳恒久安泰环保与节能科技有限公司 | Carbon felt electrode runner processing method and processing equipment for flow battery and carbon felt electrode |
| CN116728490B (en) * | 2023-08-16 | 2023-10-31 | 沈阳恒久安泰环保与节能科技有限公司 | Carbon felt electrode runner processing method and processing equipment for flow battery and carbon felt electrode |
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