CN116742088A - Flow battery and flow battery stack - Google Patents

Flow battery and flow battery stack Download PDF

Info

Publication number
CN116742088A
CN116742088A CN202210202711.1A CN202210202711A CN116742088A CN 116742088 A CN116742088 A CN 116742088A CN 202210202711 A CN202210202711 A CN 202210202711A CN 116742088 A CN116742088 A CN 116742088A
Authority
CN
China
Prior art keywords
sub
positive
flow battery
flow
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210202711.1A
Other languages
Chinese (zh)
Inventor
刘庆华
范永生
缪平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
Original Assignee
China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Energy Investment Corp Ltd, National Institute of Clean and Low Carbon Energy filed Critical China Energy Investment Corp Ltd
Priority to CN202210202711.1A priority Critical patent/CN116742088A/en
Publication of CN116742088A publication Critical patent/CN116742088A/en
Pending legal-status Critical Current

Links

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
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • 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

Landscapes

  • 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 embodiment of the application provides a flow battery and a flow battery stack, and belongs to the technical field of energy storage. The flow battery comprises a positive electrode frame, positive electrodes, diaphragms, negative electrodes and negative electrode frames which are sequentially stacked, wherein each positive electrode comprises N sub-positive electrodes, two adjacent sub-positive electrodes in the N sub-positive electrodes are stacked through a first insulating layer, each negative electrode comprises N sub-negative electrodes corresponding to the N sub-positive electrodes one by one, and two adjacent sub-negative electrodes in the N sub-negative electrodes are stacked through a second insulating layer, so that the flow battery is formed by stacking N sub-flow batteries, wherein N is a positive integer greater than 1. The output voltage of a flow cell stack formed by using the flow cell provided by the embodiment of the application can be improved by N times compared with a flow cell stack formed by the same number of flow cells in the related art.

Description

Flow battery and flow battery stack
Technical Field
The application relates to the technical field of energy storage, in particular to a flow battery and a flow battery stack.
Background
The energy storage is used as a key technology for improving the energy utilization rate, is used for the aspects of renewable energy grid connection, peak clipping, valley filling, peak regulation, frequency modulation and the like, and can improve the renewable energy utilization rate and the power grid stability. The flow battery has the advantages of long service life, safety, reliability, independent design of power and capacity and the like, and becomes one of the main technologies of large-scale energy storage.
Flow batteries are typically composed of a power unit and a capacity unit. The electrolyte is used as the electrolyte of the capacity unit, the energy storage and release are realized by the valence state change of the active substance in the electrolyte, and when the power unit is in operation, the electrolyte flows through the inside of the electric pile which is used as the power unit to convert electric energy and chemical energy, so that the power input and output are realized.
Currently, flow batteries are generally low in voltage level, on the one hand because they are affected by bypass current and, on the other hand, because stacking more batteries can create manufacturing difficulties.
Disclosure of Invention
The embodiment of the application aims to provide a flow battery and a flow battery stack, which are used for solving the technical problem that the common voltage level of the flow battery is low.
In order to achieve the above object, an embodiment of the present application provides a flow battery, including a positive electrode frame, a positive electrode, a separator, a negative electrode, and a negative electrode frame sequentially stacked, where the positive electrode includes N sub-positive electrodes, two adjacent sub-positive electrodes among the N sub-positive electrodes are stacked by a first insulating layer, the negative electrode includes N sub-negative electrodes corresponding to the N sub-positive electrodes one to one, and two adjacent sub-negative electrodes among the N sub-negative electrodes are stacked by a second insulating layer, so that the flow battery is formed by stacking N sub-flow batteries, where N is a positive integer greater than 1.
Optionally, the N sub-positive electrodes and the N sub-negative electrodes have the same size.
Optionally, the N sub-positive electrodesEach sub-positive electrode of the N sub-negative electrodes has a size of 100cm 2 -5000cm 2 Preferably 100cm 2 -2000cm 2 。
Optionally, the first insulating layer and/or the second insulating layer is made of a porous insulating material.
Optionally, the porosity of the porous insulating material, the porosity of the N sub-positive electrodes, and the porosity of the N sub-negative electrodes are the same.
Correspondingly, the embodiment of the application also provides a flow battery stack, which comprises: according to the flow battery; the positive end plate comprises a positive current guiding plate and a negative current guiding plate, wherein the positive current guiding plate comprises N sub positive current guiding plates corresponding to the N sub positive electrodes one by one and the negative current guiding plate comprises N sub negative current guiding plates corresponding to the N sub negative electrodes one by one, the adjacent two sub positive current guiding plates in the N sub positive current guiding plates are overlapped through a third insulating layer, and the adjacent two negative current guiding plates in the N sub negative current guiding plates are overlapped through a fourth insulating layer.
Optionally, the flow battery stack includes one flow battery described above, and the N sub-flow batteries are connected in series.
Optionally, the flow battery stack includes M flow batteries described above, and the flow battery stack further includes: the bipolar plates are arranged between two adjacent flow batteries, the bipolar plates comprise N sub-bipolar plates corresponding to the N sub-positive electrodes one by one, the adjacent two sub-bipolar plates in the N sub-bipolar plates are overlapped through a fifth insulating layer, the flow battery stack is formed by overlapping N groups of sub-flow batteries, each group of sub-flow batteries comprises M sub-flow batteries, and M is a positive integer greater than 1.
Optionally, the N sets of sub-flow batteries are connected in series.
Optionally, the third insulating layer, the fourth insulating layer, and the fifth insulating layer are formed in a sealing form or a welding form.
In the flow battery provided by the embodiment of the application, the positive electrode is formed by N (N is a positive integer greater than 1) sub-positive electrodes overlapped through the first insulating layer, and the negative electrode is formed by N sub-negative electrodes overlapped through the second insulating layers corresponding to the N sub-positive electrodes one by one, which is equivalent to that of a single flow battery formed by overlapping N sub-flow batteries. The flow battery has the following technical advantages:
(1) The output voltage of a flow cell stack formed by using the flow cell provided by the embodiment of the application can be improved by N times compared with a flow cell stack formed by the same number of flow cells in the related art.
(2) The increase of the output voltage of the flow battery stack can promote the implementation of inversion and boosting, reduce the difficulty of system integration and enable the flow battery stack to be more flexibly used in various scenes.
Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. In the drawings:
FIG. 1 shows a schematic diagram of a flow battery according to an embodiment of the application;
FIG. 2 shows a schematic diagram of a flow cell stack according to an embodiment of the application;
FIG. 3 shows a schematic diagram of a flow cell stack according to another embodiment of the application;
fig. 4 shows a discharge polarization curve comparison of the flow cell stack shown in fig. 2 and 3 and the flow cell stack of the related art.
Detailed Description
The following describes the detailed implementation of the embodiments of the present application with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.
Fig. 1 shows a schematic diagram of a flow battery according to an embodiment of the present application. As shown in fig. 1, an embodiment of the present application provides a flow battery including a positive electrode frame 11, a positive electrode, a separator 13 (also referred to as an ion exchange membrane), a negative electrode, and a negative electrode frame 15, which are sequentially stacked. The positive electrode may include N sub-positive electrodes 12, adjacent two of the N sub-positive electrodes 12 being stacked through the first insulating layer 16. The negative electrode may include N sub-negative electrodes 14, and two adjacent sub-negative electrodes of the N sub-negative electrodes 14 are stacked through the second insulating layer 17, so that the flow battery is formed by stacking N sub-flow batteries. Each sub-flow battery may be considered to be formed by sequentially stacking the positive electrode frame 11, one sub-positive electrode, the separator 13, and one sub-negative electrode aligned with the one sub-positive electrode in position, the negative electrode frame 15. In any embodiment of the present application, N is a positive integer greater than 1. The direction of "stacking" described in any of the embodiments of the present application is perpendicular to the direction of "stacking". For example, as shown in fig. 1, the direction of "stacking" is the lateral direction, and the direction of "stacking" is the longitudinal direction.
The flow battery may further include sealing members at the peripheries of the positive and negative electrodes for preventing electrolyte from penetrating to the outside of the flow battery to corrode the flow battery.
The positive electrode frame 11 is provided with a flow path for introducing a positive electrolyte to the positive electrode. Accordingly, the anode electrode frame 15 is provided with a flow path for introducing an anode electrolyte to the anode electrode. The example in fig. 1 shows that the liquid-flow battery comprises one integral positive electrode frame 11 and one integral negative electrode frame 15. In alternative embodiments, the flow battery may include one or more positive electrode frames corresponding to the N sub-positive electrodes 12, and one or more negative electrode frames corresponding to the N sub-negative electrodes 14. For example, a flow battery may include N positive electrode frames in one-to-one correspondence with N sub-positive electrodes 12, each positive electrode frame introducing positive electrolyte for a respective sub-positive electrode; accordingly, the flow battery may further include N negative electrode frames in one-to-one correspondence with the N sub-negative electrodes 14, each negative electrode frame introducing a negative electrolyte for a corresponding sub-negative electrode.
The N sub-positive electrodes 12 and the N sub-negative electrodes 14 may preferably be identical, for example, each sub-positive electrode 12 and each sub-negative electrode 14 may be identical in size and identical in material. The size of each sub-positive electrode 12 and the size of each sub-negative electrode 14 may be 100cm 2 -5000cm 2 Preferably 100cm 2 -2000 cm 2 。
The first insulating layer is used to ensure that there is no electrical connection or shorting between adjacent sub-positive electrodes. The second insulating layer is used to ensure that there is no electrical connection or shorting between adjacent sub-negative electrodes.
The first insulating layer and the second insulating layer may preferably be made of the same insulating material. Specifically, the first insulating layer and the second insulating layer may be made of a porous insulating material, and preferably, the porosity of the porous insulating material, the porosity of the N sub-positive electrode, and the porosity of the N sub-negative electrode are the same to ensure that the flow resistance generated by the insulating layer, the sub-positive electrode, and the sub-negative electrode are the same, thereby ensuring uniform flow of the electrolyte. In some other embodiments, the first insulating layer and the second insulating layer may also be made of different insulating materials; or the porosity of the porous insulating material making up the first insulating layer and the porous insulating material making up the second insulating layer may be different; or the porosity of the porous insulating material, the porosity of the N sub-positive electrodes, and the porosity of the N sub-negative electrodes may be different.
In a further embodiment of the present application, there is provided a flow battery stack comprising: a flow battery according to any embodiment of the present application; the positive end plate comprises a positive current guiding plate and a negative current guiding plate, wherein the positive current guiding plate comprises N sub positive current guiding plates corresponding to the N sub positive electrodes one by one and the negative current guiding plate comprises N sub negative current guiding plates corresponding to the N sub negative electrodes one by one, the adjacent two sub positive current guiding plates in the N sub positive current guiding plates are overlapped through a third insulating layer, and the adjacent two negative current guiding plates in the N sub negative current guiding plates are overlapped through a fourth insulating layer.
In an alternative embodiment, the flow cell stack may be composed of a flow cell according to any of the embodiments of the present application, and positive and negative end plates disposed at both ends. The positive end plate comprises a positive current lead-out plate and a first polymer plate positioned outside the positive current lead-out plate, and correspondingly the negative end plate comprises a negative current lead-out plate and a second polymer plate positioned outside the negative current lead-out plate. The first polymer plate is provided with a runner interface, the runner interface is communicated with a runner of the positive electrode frame, and positive electrolyte flows into the runner of the positive electrode frame through the runner interface. The second polymer plate is provided with a runner interface, the runner interface is communicated with a runner of the negative electrode frame, and negative electrolyte flows into the runner of the negative electrode frame through the runner interface. The components of the flow cell stack may be fastened or secured by bolts or welding.
The third insulating layer is used for ensuring that no electric connection or short circuit phenomenon exists between the adjacent sub-positive electrode current leading-out plates. The fourth insulating layer is used for ensuring that no electric connection or short circuit phenomenon exists between the adjacent sub-negative electrode current leading-out plates. The third and fourth insulating layers may be made of the same insulating material, for example, may be made of a sealing or welding or other form of insulating material.
In this embodiment, the N sub-flow batteries of the flow battery stack may be connected in series by an external circuit. Specifically, the series connection of N sub-flow batteries may be achieved by electrically connecting each sub-positive current lead-out plate and sub-negative current lead-out plate.
In an alternative embodiment, a flow battery stack may include M flow batteries according to any of the embodiments of the present application, wherein M is a positive integer greater than 1. Correspondingly, the flow battery stack can further comprise bipolar plates, the bipolar plates are arranged between two adjacent flow batteries, the bipolar plates comprise N sub-bipolar plates which are in one-to-one correspondence with the N sub-positive electrodes, and the adjacent two sub-bipolar plates in the N sub-bipolar plates are overlapped through a fifth insulating layer, so that the flow battery stack is formed by overlapping N groups of sub-flow batteries, and each group of sub-flow batteries comprises M sub-flow batteries. The number of bipolar plates is the number of flow batteries minus one. Each sub-bipolar plate may be used to connect adjacent two sub-flow batteries in series.
In this embodiment, the positive end plate includes, in addition to the positive current lead-out plate, a first polymer plate located outside the positive current lead-out plate, and correspondingly the negative end plate includes, in addition to the negative current lead-out plate, a second polymer plate located outside the negative current lead-out plate. The first polymer plate is provided with a runner interface, the runner interface is communicated with a runner of the positive electrode frame, and positive electrolyte flows into the runner of the positive electrode frame through the runner interface. The second polymer plate is provided with a runner interface, the runner interface is communicated with a runner of the negative electrode frame, and negative electrolyte flows into the runner of the negative electrode frame through the runner interface. The components of the flow cell stack may be fastened or secured by bolts or welding.
The fifth insulating layer is used for ensuring that no electrical connection or short circuit phenomenon exists between adjacent sub-bipolar plates. The fifth insulating layer, the third insulating layer and the fourth insulating layer may be made of the same insulating material, for example, may be made of a sealing or welding or other forms of insulating material.
The sub bipolar plates, the sub positive electrode current leading-out plates and the sub negative electrode current leading-out plates can be made of graphite or graphite plate junction metal conductors. The sizes of the sub bipolar plate, the sub positive electrode current lead-out plate and the sub negative electrode current lead-out plate can be 100cm 2 -5000cm 2 Preferably 100cm 2 -2000cm 2 。
In this embodiment, N sets of sub-flow batteries are connected in series. Specifically, each of the N groups of sub-flow batteries may be connected in series with each other by electrically connecting the respective sub-positive current lead-out plates and the sub-negative current lead-out plates. Since the sub-flow batteries in each group of sub-flow batteries are also connected in series, it is equivalent to each sub-night-flow battery being connected in series with each other.
Further, the external structure and the size of the flow battery stack provided by the embodiment of the application can be kept the same as those of the flow battery stack in the related technology, so that the flow battery stack in the related technology can be replaced conveniently. In addition, the flow battery stack provided by the embodiment of the application can be considered as the division of the components in the flow battery stack, wherein the positive electrode, the negative electrode, the bipolar plate, the positive current lead-out plate and the negative current lead-out plate are respectively and correspondingly and uniformly divided into N pieces, and the division positions of the components can be in the same horizontal line. The gaps where the positive electrode and the negative electrode are divided are filled with an insulating layer made of a porous insulating material having the same porosity as the positive electrode and the negative electrode. The gaps of the bipolar plate, the positive electrode current lead-out plate and the negative electrode current lead-out plate, which are divided, are filled with insulating layers made of sealing or welding or other insulating materials. The division and non-division of other components in the flow cell stack, such as the separator, the positive electrode frame, the negative electrode frame, the first polymer plate and the second polymer plate provided at both ends, and the like, may not affect the output of the flow cell stack of high voltage, and therefore it is preferable that these other components be not divided, wherein the flow channels of the positive electrode frame and the negative electrode frame may be maintained the same as those of the positive electrode frame and the negative electrode frame in the related art.
The division corresponds to forming N parallel small stacks in the stacking direction of the flow cell stack. By connecting these small stacks in series by an external circuit, the end voltage output by the flow cell stack will be N times the end voltage output by the same type of undivided flow cell stack. It should be understood that the "split" is merely a generic explanation, and in practice, the flow cell stack provided in the embodiments of the present application is not formed by "split" and the "split" components are preferably formed by "stacking" as described above at the beginning of the design or at the time of actual production.
Optionally, the flow battery stack provided in the embodiment of the application may be an all-vanadium flow battery stack, a flow battery stack of other systems, or a single flow battery stack.
In the flow battery or the flow battery stack of the related art, the value of N is 1. The output voltage of the flow battery formed by using the flow battery provided by the embodiment of the application can be improved by N times compared with that of the flow battery formed by the flow batteries in the same number of related technologies, and the external structure and the size can be kept unchanged at the same time.
The beneficial effects of the flow cell stack provided by the embodiments of the present application are further described below through some embodiments. The flow cell stack in these embodiments is an all-vanadium flow cell stack.
Example 1
As shown in fig. 2, in this embodiment, n=2, and the flow cell stack is composed of 3 flow cells. Each flow battery includes: the positive electrode comprises a first sub positive electrode and a second sub positive electrode which are overlapped through a first insulating layer, and the negative electrode comprises a first sub negative electrode and a second sub negative electrode which are overlapped through a second insulating layer. And bipolar plates are arranged between two adjacent flow batteries and correspondingly comprise a first sub-bipolar plate and a second sub-bipolar plate which are overlapped through a fifth insulating layer. The flow battery comprises a flow battery, wherein the two ends of the flow battery are provided with a positive end plate and a negative end plate, the positive end plate comprises a positive current leading-out plate and a first polymer plate, and the negative end plate comprises a negative current leading-out plate and a second polymer plate. The positive electrode current lead-out plate comprises a first sub positive electrode current lead-out plate and a second sub positive electrode current lead-out plate which are overlapped through a third insulating layer, and the negative electrode current lead-out plate comprises a first sub negative electrode current lead-out plate and a second sub negative electrode current lead-out plate which are overlapped through a fourth insulating layer. Such that the flow cell stack is formed by stacking 2 sets of sub-flow cells, each set comprising 3 sub-flow cells.
The first sub positive electrode current lead-out plate is electrically connected with the second sub negative electrode current lead-out plate, outputs positive electrode voltage through the second sub positive electrode current lead-out plate and outputs negative electrode voltage through the first sub negative electrode current lead-out plate; or the second sub positive electrode current lead-out plate is electrically connected with the first sub negative electrode current lead-out plate, and outputs positive electrode voltage through the first sub positive electrode current lead-out plate and outputs negative electrode voltage through the second sub negative electrode current lead-out plate.
In this embodiment, the total area of the positive electrode and the negative electrode is 200cm 2 The area of each corresponding sub positive electrode and each sub negative electrode is 100cm 2 。
The initial concentration of the positive electrode electrolyte of the flow battery stack is 0.8mol L -1 V(IV)+0.8mol L -1 V(IV)+3mol L -1 H 2 SO 4 The concentration of the negative electrode electrolyte is 0.8mol L -1 V(II)+0.8mol L -1 V(III)+3mol L -1 H 2 SO 4 。
Since each sub-flow battery is connected in series, the potential is stepped up at the sub-positive electrode of each sub-flow battery. As shown in fig. 2, starting from the negative electrode, the potentials at the sub-positive electrodes of the sub-flow batteries connected in series in sequence are respectively: ocp 1, ocp 2, ocp 3, ocp 4, ocp 5, ocp 6. Thus in this embodiment, the flow cell stack is capable of outputting a voltage of 6 OCP, where OCP represents the open circuit potential.
Example 2
As shown in fig. 3, in this embodiment, n=3, and the flow cell stack is composed of 3 flow cells. Each flow battery includes: the positive electrode comprises a first sub positive electrode, a second sub positive electrode and a third sub positive electrode which are overlapped through a first insulating layer, and the negative electrode comprises a first sub negative electrode, a second sub negative electrode and a third sub negative electrode which are overlapped through a second insulating layer. And bipolar plates are arranged between two adjacent flow batteries and correspondingly comprise a first sub-bipolar plate, a second sub-bipolar plate and a third sub-bipolar plate which are overlapped through a fifth insulating layer. The flow battery comprises a flow battery, wherein the two ends of the flow battery are provided with a positive end plate and a negative end plate, the positive end plate comprises a positive current leading-out plate and a first polymer plate, and the negative end plate comprises a negative current leading-out plate and a second polymer plate. The positive electrode current lead-out plate comprises a first sub positive electrode current lead-out plate, a second sub positive electrode current lead-out plate and a third sub positive electrode current lead-out plate which are overlapped through a third insulating layer, and the negative electrode current lead-out plate comprises a first sub negative electrode current lead-out plate, a second sub negative electrode current lead-out plate and a third sub negative electrode current lead-out plate which are overlapped through a fourth insulating layer. Such that the flow cell stack is formed by stacking 3 sets of sub-flow cells, each set comprising 3 sub-flow cells.
The second sub negative electrode current lead-out plate is electrically connected with the first sub positive electrode current lead-out plate, the third sub negative electrode current lead-out plate is electrically connected with the second sub positive electrode current lead-out plate, negative electrode current is output through the first sub negative electrode current lead-out plate, and positive electrode current is output through the third sub positive electrode current lead-out plate.
In this embodiment, the total area of the positive electrode and the negative electrode is 200cm 2 The area of each corresponding sub positive electrode and each sub negative electrode is 66.7cm 2 。
The initial concentration of the positive electrode electrolyte of the flow battery stack is 0.8mol L -1 V(IV)+0.8mol L -1 V(IV)+3mol L -1 H 2 SO 4 The concentration of the negative electrode electrolyte is 0.8mol L -1 V(II)+0.8mol L -1 V(III)+3mol L -1 H 2 SO 4 。
According to a principle similar to embodiment 1, in this embodiment, the flow cell stack is capable of outputting a voltage of 9 ocp.
Comparative example 1
This embodiment describes a flow cell stack in the related art. In this embodiment, n=1, and the flow cell stack is composed of 3 flow cells. Each flow battery includes: a positive electrode frame, a positive electrode, a separator, a negative electrode, and a negative electrode frame, which are laminated in this order. A bipolar plate is arranged between two adjacent flow batteries. The flow battery comprises a flow battery, wherein the two ends of the flow battery are provided with a positive end plate and a negative end plate, the positive end plate comprises a positive current leading-out plate and a first polymer plate, and the negative end plate comprises a negative current leading-out plate and a second polymer plate.
In this embodiment, the total area of the positive electrode and the negative electrode is 200cm 2 . The discharge electrode performance of the flow cell stack can be measured by a potentiostat.
The initial concentration of the positive electrode electrolyte of the flow battery stack is 0.8mol L -1 V(IV)+0.8mol L -1 V(IV)+3mol L -1 H 2 SO 4 The concentration of the negative electrode electrolyte is 0.8mol L -1 V(II)+0.8mol L -1 V(III)+3mol L -1 H 2 SO 4 。
According to a principle similar to embodiment 1, in this embodiment, the flow cell stack is capable of outputting a voltage of 3 x ocp. It is apparent that the output voltage of the flow cell stack in example 1 was increased by 2 times and the output voltage of the flow cell stack in example 2 was increased by 3 times as compared with the comparative example.
Fig. 4 shows a discharge polarization curve comparison of the flow cell stack shown in fig. 2 and 3 and the flow cell stack of the related art. As can be seen, by practical experiments, it was verified that: the stack operating voltages of example 1 and example 2 are 2 times and 3 times, respectively, of the comparative example, in proportion to the number of sub-unit cells into which the unit cells are divided.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (10)

1. A flow battery is characterized by comprising a positive electrode frame, a positive electrode, a diaphragm, a negative electrode and a negative electrode frame which are sequentially laminated,
the positive electrode comprises N sub positive electrodes, two adjacent sub positive electrodes in the N sub positive electrodes are overlapped through a first insulating layer, the negative electrode comprises N sub negative electrodes corresponding to the N sub positive electrodes one by one, and two adjacent sub negative electrodes in the N sub negative electrodes are overlapped through a second insulating layer, so that the flow battery is formed by overlapping N sub flow batteries, wherein N is a positive integer greater than 1.
2. The flow battery of claim 1, wherein the N sub-positive electrodes and the N sub-negative electrodes are each the same size.
3. The flow battery of claim 2, wherein the flow battery comprises a plurality of cells,
each of the N sub-positive electrodes and each of the N sub-negative electrodes has a size of 100cm 2 -5000cm 2 Preferably 100cm 2 -2000cm 2 。
4. The flow battery of claim 1, wherein the first insulating layer and/or the second insulating layer is made of a porous insulating material.
5. The flow battery of claim 4, wherein the porosity of the porous insulating material, the porosity of the N sub-positive electrodes, and the porosity of the N sub-negative electrodes are the same.
6. A flow battery stack, comprising:
the flow battery of any one of claims 1 to 5;
the positive end plate comprises a positive current guiding plate and a negative current guiding plate, wherein the positive current guiding plate comprises N sub positive current guiding plates corresponding to the N sub positive electrodes one by one and the negative current guiding plate comprises N sub negative current guiding plates corresponding to the N sub negative electrodes one by one, the adjacent two sub positive current guiding plates in the N sub positive current guiding plates are overlapped through a third insulating layer, and the adjacent two negative current guiding plates in the N sub negative current guiding plates are overlapped through a fourth insulating layer.
7. The flow battery stack of claim 6, comprising one flow battery according to any one of claims 1 to 5, the N sub-flow batteries being connected in series.
8. The flow battery stack of claim 6, comprising M flow batteries according to any one of claims 1 to 5, and further comprising:
the bipolar plates are arranged between two adjacent flow batteries, the bipolar plates comprise N sub-bipolar plates which are in one-to-one correspondence with the N sub-positive electrodes, the adjacent two sub-bipolar plates in the N sub-bipolar plates are overlapped through a fifth insulating layer, the flow battery stack is formed by overlapping N groups of sub-flow batteries, each group of sub-flow batteries comprises M sub-flow batteries,
wherein M is a positive integer greater than 1.
9. The flow battery stack of claim 8, wherein the N sets of sub-flow batteries are connected in series.
10. The flow battery stack of claim 7, wherein the third insulating layer, the fourth insulating layer, and the fifth insulating layer are formed in a sealed form or a welded form.
CN202210202711.1A 2022-03-03 2022-03-03 Flow battery and flow battery stack Pending CN116742088A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210202711.1A CN116742088A (en) 2022-03-03 2022-03-03 Flow battery and flow battery stack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210202711.1A CN116742088A (en) 2022-03-03 2022-03-03 Flow battery and flow battery stack

Publications (1)

Publication Number Publication Date
CN116742088A true CN116742088A (en) 2023-09-12

Family

ID=87901696

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210202711.1A Pending CN116742088A (en) 2022-03-03 2022-03-03 Flow battery and flow battery stack

Country Status (1)

Country Link
CN (1) CN116742088A (en)

Similar Documents

Publication Publication Date Title
ATE204100T1 (en) REDOX FLOW BATTERY SYSTEM AND CELL STACK
JPH1012261A (en) Redox flow battery
US9153832B2 (en) Electrochemical cell stack having a protective flow channel
CN102593491A (en) Liquid flow cell stack and cell system comprising same
CN102136594A (en) Double-power liquid stream battery electric pile structure and liquid stream battery containing electric pile
CN101719556A (en) Pile structure of redox flow battery
KR20170142753A (en) Method for a renewable energy storage and manufacturing the utilization equipment of mixed redox flow batteries
CN106876765B (en) A kind of flow cell pile
CN108598543B (en) Flow battery
US20200266457A1 (en) Multipoint electrolyte flow field embodiment for vanadium redox flow battery
CN114497616B (en) Zinc-bromine storage battery
CN116742088A (en) Flow battery and flow battery stack
JP2017134938A (en) Redox secondary battery system
CN216488182U (en) Flow battery pile structure
EP2917951A1 (en) Electrochemical device and method for controlling corrosion
CN116742036A (en) Electrode frame, flow battery and flow battery stack
CN202474107U (en) Redox flow cell stack and cell system comprising same
CN116742090A (en) Flow battery and flow battery stack
CN116742037A (en) Electrode frame, flow battery and flow battery stack
CN116742089A (en) Bipolar plate for flow cell stack and flow cell stack
CN112993360B (en) Zinc-bromine single-flow galvanic pile and battery
CN210576241U (en) Device for measuring concentration distribution of electrolyte of flow battery
CN214153015U (en) Integrated assembly structure of metal-air battery and metal-air battery
CN115588766A (en) Electric pile structure for double-power flow battery
CN116247259A (en) Flow battery pile structure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination