CN209104276U - A kind of bipolar plates suitable for rectangle flow battery - Google Patents
A kind of bipolar plates suitable for rectangle flow battery Download PDFInfo
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- CN209104276U CN209104276U CN201821972326.0U CN201821972326U CN209104276U CN 209104276 U CN209104276 U CN 209104276U CN 201821972326 U CN201821972326 U CN 201821972326U CN 209104276 U CN209104276 U CN 209104276U
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- 239000003792 electrolyte Substances 0.000 claims abstract description 58
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910001456 vanadium ion Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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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Abstract
A kind of bipolar plates suitable for rectangle flow battery, the bipolar plates are a rectangular flat plate structure, there is a rectangular area for contacting with electrode, referred to as electrode zone in the middle part of a side surface or two side surfaces for plate；Electrolyte flows into after electrode zone from the rectangular lower side of rectangular area to be flowed out by rectangular upper portion side again, and the rectangular lower side of inflow is referred to as electrode zone entrance side, and the rectangular upper portion side of outflow is referred to as electrode zone outlet side；In the rectangle left side of electrode zone and right side side respectively to the long striped groove group equipped with 1 group of sequence interval being made of 2 or more long striped grooves in the middle part of electrode zone.Its structure is simple, it is easy to process, by the water conservancy diversion quadrilateral structure for designing appropriate direction in bipolar plates, to eliminate the low flow velocity area of near wall, to realize being uniformly distributed for rectangular battery electrolyte inside, alleviate local effect, improves electrolyte utilization rate, it is final to promote battery performance, reduce system cost.
Description
Technical Field
The utility model relates to a flow battery field, in particular to flow battery or galvanic pile bipolar plate.
Background
Fossil energy consumption causes a series of environmental problems such as greenhouse effect, glacier melting, climate change, etc., so that people have more attention to renewable energy. Renewable energy sources have the characteristics of discontinuity and instability, and in order to better utilize the renewable energy sources, a series of energy storage technologies are developed, wherein electrochemical energy storage has the characteristics of low regional environment limitation, high flexibility and the like, and is widely concerned. Among the electrochemical energy storage technologies, the flow battery represented by the all-vanadium flow battery is very suitable for large-scale energy storage application. The active substance of the flow battery is usually dissolved in liquid, and when the battery operates, the electrolyte dissolved with the active substance flows through the porous electrode under the driving action of the pump to generate electrochemical reaction, so that the storage and the release of energy are realized. In flow batteries, the flow characteristics of the electrolyte are closely related to the battery performance. However, with the existing structure, the distribution uniformity of the electrolyte is difficult to be ensured, and particularly, in the direction parallel to the inlet and outlet cross sections and at the position close to the wall surface, the distribution of the concentration of the active material is further influenced, so that the performance of the battery is reduced.
SUMMERY OF THE UTILITY MODEL
The novel flow battery bipolar plate structure is simple in structure and convenient to process, and a low flow velocity area near the wall surface is eliminated by designing a flow guide quadrilateral structure with a proper orientation on the bipolar plate, so that the uniform distribution of electrolyte inside a rectangular battery is realized, the local effect is relieved, the utilization rate of the electrolyte is improved, the performance of the battery is finally improved, and the system cost is reduced.
In order to achieve the above purpose, the utility model provides a specific technical scheme as follows:
a bipolar plate suitable for a rectangular flow battery or an electric pile is of a rectangular flat plate structure, and a rectangular area for contacting with an electrode is arranged in the middle of one side surface or two side surfaces of the plate, namely an electrode area; electrolyte flows into the electrode area from the lower rectangular side of the rectangular area and then flows out from the upper rectangular side, the lower rectangular side is called the inlet side of the electrode area, and the upper rectangular side is called the outlet side of the electrode area; the left side and the right side of the rectangle of the electrode area are respectively provided with 1 group of sequentially spaced strip-shaped groove groups consisting of more than 2 strip-shaped grooves towards the middle part of the electrode area.
The utility model discloses battery or galvanic pile design standard do:
2 groups of strip-shaped grooves with side edges opened towards the middle part of the electrode area are arranged on a plane A of the plate body and are axisymmetric with a perpendicular bisector B of the side edge of the inlet of the electrode area; the section of the strip-shaped groove parallel to the plane A is a quadrangle C, one side of two opposite sides in the quadrangle C is superposed with the left side or the right side of the rectangle, and the other side D is positioned below the superposed side; the other two opposite sides are respectively an upper side E and a lower side F; more than 2 strip-shaped grooves in 2 groups of strip-shaped groove groups are symmetrically arranged one by one; the symmetrical groove edges D are overlapped, and the symmetrical edge E and the symmetrical edge F are respectively intersected to form a V shape; or, the symmetrical groove sides D are spaced, and the symmetrical sides E and the symmetrical sides F are respectively in a corresponding inverted splayed shape.
The V-shaped or inverted V-shaped groove consists of two strip-shaped grooves, the bottom of the V-shaped or inverted V-shaped groove formed by the grooves faces the electrolyte inflow side edge, and the opening direction faces the electrolyte outflow side edge; the two strip-shaped grooves forming the V-shaped groove are mutually communicated, but the two strip-shaped grooves forming the inverted splayed shape are not mutually communicated.
The straight line of the edge E or the edge F forms an included angle of 5-85 degrees with the perpendicular bisector B respectively.
Preferably, the width of the long strip-shaped groove forming the V-shaped or inverted splayed groove is 0.1-100 mm, and the depth is 0.1-100 mm.
Preferably, the width and height/depth of the elongated grooves constituting the V-shaped or inverted-splayed grooves are the same, or follow the principle that the width and/or depth/height of the guide quadrilateral structure near the midpoint of the electrolyte inflow and outflow cross-section of the electrode region are narrower and/or smaller while the width and/or depth/height are larger away from the ends.
Preferably, the diameter of the electrolyte inflow and outflow port is 0.1-100 mm.
The width of the plate body around the upper electrode area of the plate body is 1-500 mm; the thickness of the plate body is 0.1-100 mm.
Preferably, the intersections of the corners and the edges inside the long strip-shaped grooves forming the V-shaped or inverted V-shaped groove are all in arc transition.
The bipolar plate material provided by the utility model can be selected from graphite and other materials, but is not limited to the material. The groove structure on the plate body can be formed by mechanical processing, carving, hot pressing and the like, but is not limited thereto.
Compared with the prior art, the utility model discloses a bipolar plate structure specially adapted rectangle redox flow battery can make the homogeneity of electrolyte distribution obtain greatly improving to guarantee that battery and pile inside reaction are even unanimous, weaken local effect, and the height or the degree of depth of accessible adjustment recess improve the homogeneity of importing and exporting direction electrolyte distribution, improve the electrolyte utilization ratio. Especially for a high-power electric pile, the cost can be effectively lowered, and materials can be saved.
The utility model discloses beneficial effect that technical scheme brought
The bipolar plate is simple in structure and convenient to process, and effectively improves the distribution uniformity of electrolyte by promoting the electrolyte to flow towards the rectangular wall surface, so that the local effect is relieved, and the battery performance is improved. Specifically, the method comprises the following steps:
under the influence of the viscosity of the fluid, especially the liquid flow itself, when the fluid flows near the wall surface, the flow velocity of the fluid is smaller in a certain range as the fluid is closer to the wall surface until the flow velocity at the wall surface is reduced to 0. Therefore, the electrolyte updating rate in the region is low, and as the reaction is continuously carried out, the active substance is not sufficiently supplied, so that the polarization is increased, the voltage efficiency is reduced, the electrolyte utilization rate is reduced, and finally the overall performance of the battery is reduced.
Through the water conservancy diversion structure of establishing proper orientation near the wall additional for electrolyte is in the acceleration of the near velocity of flow of wall, thereby eliminates the thin layer of delay near the wall, makes the near active material concentration of wall rise, and active material distributes more evenly, reduces battery polarization, promotes battery performance.
Drawings
FIG. 1 is a schematic diagram of internal concentration distribution during discharging of a rectangular flow battery
FIG. 2 is a schematic structural view of embodiment 1;
FIG. 3 is a schematic structural view of embodiment 2;
FIG. 4 is a schematic structural diagram of comparative example 3;
description of the symbols:
1-negative electrolyte inlet, 2-plate, 3-electrode zone inlet side, 4-electrode zone, 5-elongated groove, 6-electrode zone wall, 7-positive electrolyte inlet, 8-negative electrolyte outlet, 9-electrode zone outlet side, 10-positive electrolyte outlet
Detailed Description
Example 1
As shown in fig. 2, a flow battery bipolar plate. The bipolar plate is formed by pressing graphite and comprises a bipolar plate body 2, wherein a negative electrolyte inflow port 1, a negative electrolyte outflow port 8, a positive electrolyte inflow port 7 and a positive electrolyte outflow port 10 are arranged on the plate body. The negative electrolyte inlet 1 and the positive electrolyte inlet 7 are located on the lower bottom side of the plate, and the negative electrolyte outlet 8 and the positive electrolyte outlet 10 are located on the upper bottom side of the plate. The middle part of the plate body is provided with an electrode area 4 which is rectangular, a V-shaped groove is arranged in the electrode area, and the V-shaped groove can be regarded as being composed of two strip-shaped grooves.
The thickness of the plate body is 8 mm; the negative electrolyte inlet 1, the negative electrolyte outlet 8, the positive electrolyte inlet 7 and the positive electrolyte outlet 10 are all circular and have a diameter of 14 mm; the electrode area is in a rectangle with the side length of 280mm as the side of the inlet and the side of the outlet, and the other two sides have the side length of 180 mm. The depth of the V-shaped groove is 1mm, the V-shaped groove is composed of 14 strip-shaped grooves with the same length and the width of 3mm, and the two edges of the leftmost edge and the rightmost edge of the grooves are superposed with the wall surface of the electrode area. The remaining four sides make 60 ° angles with the perpendicular bisector of the electrolyte inlet and outlet sides.
The two surfaces of the plate body are provided with the same V-shaped grooves; all the intersection points where the corners exist are in arc transition. The grooves on the bipolar plate are formed by mechanical processing and carving.
Example 2
As shown in fig. 3, a flow battery bipolar plate. The bipolar plate is formed by pressing graphite and comprises a bipolar plate body 2, wherein a negative electrolyte inflow port 1, a negative electrolyte outflow port 8, a positive electrolyte inflow port 7 and a positive electrolyte outflow port 10 are arranged on the plate body. The negative electrolyte inlet 1 and the positive electrolyte inlet 7 are located on the lower bottom side of the plate, and the negative electrolyte outlet 8 and the positive electrolyte outlet 10 are located on the upper bottom side of the plate. The middle part of the plate body is provided with an electrode area 4 which is rectangular, an inverted splayed groove is arranged in the electrode area, and the inverted splayed groove consists of two strip-shaped grooves.
The thickness of the plate body is 10 mm; the negative electrolyte inlet 1, the negative electrolyte outlet 8, the positive electrolyte inlet 7 and the positive electrolyte outlet 10 are all circular and have a diameter of 12 mm; the electrode area is in a rectangle with the side length of 300mm as the inlet and outlet side, and the other two sides have the side length of 220 mm. The depth of the inverted splayed groove is 2mm, the inverted splayed groove is composed of 14 strip-shaped grooves with the same length and the width of 1.5mm, and the leftmost side of the left groove and the rightmost side of the right groove are coincided with the wall surface of an electrode area. The remaining sides included 65 ° to the perpendicular bisector of the electrolyte inlet and outlet sides.
The two surfaces of the plate body are provided with the same inverted splayed grooves; all the intersection points where the corners exist are in arc transition. The grooves on the bipolar plate are formed by mechanical processing and carving.
Comparative example 3
The comparative example was a flat plate without V-shaped or inverted eight-shaped grooves, and the structure was as shown in fig. 4. Taking the vanadium redox flow battery as an example, the commercial software package COMSOL Multiphysics is utilized@Carrying out simulation calculation, wherein a mathematical model used for simulation mainly comprises the following steps:
conservation of momentum and continuity equation:
wherein,and P represents velocity vector and pressure, mu and mu, respectively*Individual watchThe intrinsic viscosity and effective viscosity of the electrolyte are shown, and K represents the permeability of the porous medium (porous electrode) and is obtained by the Carman-Kozeny equation.
Material conservation equation:
wherein c isiIs the concentration of material i, SiIs a source term in the conservation equation of the material i,is the effective diffusion coefficient in the porous electrode region.
Boundary conditions and initial conditions:
where the inlet pressure was set to 24000Pa and the outlet pressure was set to 0 Pa.
In the model, the concentration of inlet vanadium ions was correlated to the charge-discharge state (SoC) to eliminate the effect of reaction time. The diffusion flux of all material at the outlet was set to 0, according to the assumption of a well developed flow. The wall boundary is set to 0 flux. The specific expression is as follows:
andinitial concentrations of vanadium ions for the positive and negative electrodes, respectively, were set to 1000mol m in this model-3. The relative error factor of model convergence is 1 × 10-6。
Carbon felt with thickness of 5mm is used as an electrode and the thickness is 120mA cm-2The results of the simulation calculations for the examples and comparative examples at 90% SoC are shown in the following table:
it is thus clear that adopt the utility model discloses a bipolar plate can show the homogeneity that improves electrolyte and distribute. Thereby reducing polarization, reducing local heat release and improving the utilization rate of the electrolyte.
Claims (5)
1. A bipolar plate suitable for a rectangular flow battery, comprising: the bipolar plate is of a rectangular flat plate structure, and a rectangular area which is used for contacting with an electrode is arranged in the middle of one side surface or two side surfaces of the flat plate, and is called as an electrode area; electrolyte flows into the electrode area from the lower rectangular side of the rectangular area and then flows out from the upper rectangular side, the lower rectangular side is called the inlet side of the electrode area, and the upper rectangular side is called the outlet side of the electrode area; the left side and the right side of the rectangle of the electrode area are respectively provided with 1 group of sequentially spaced strip-shaped groove groups consisting of more than 2 strip-shaped grooves towards the middle part of the electrode area.
2. A bipolar plate as in claim 1, wherein:
2 groups of strip-shaped grooves with side edges opened towards the middle part of the electrode area are arranged on a plane A of the plate body and are axisymmetric with a perpendicular bisector B of the side edge of the inlet of the electrode area; the section of the strip-shaped groove parallel to the plane A is a quadrangle C, one side of two opposite sides in the quadrangle C is superposed with the left side or the right side of the rectangle, and the other side D is positioned below the superposed side; the other two opposite sides are respectively an upper side E and a lower side F;
more than 2 strip-shaped grooves in 2 groups of strip-shaped groove groups are symmetrically arranged one by one; the symmetrical groove edges D are overlapped, and the symmetrical edge E and the symmetrical edge F are respectively intersected to form a V shape; or, the symmetrical groove sides D are spaced, and the symmetrical sides E and the symmetrical sides F are respectively in a corresponding inverted splayed shape.
3. A bipolar plate as set forth in claim 2, wherein:
the V-shaped or inverted V-shaped groove consists of two strip-shaped grooves, the bottom of the V-shaped or inverted V-shaped groove formed by the grooves faces the electrolyte inflow side edge, and the opening direction faces the electrolyte outflow side edge; the two strip-shaped grooves forming the V-shaped groove are mutually communicated, but the two strip-shaped grooves forming the inverted splayed shape are not mutually communicated.
4. A bipolar plate as set forth in claim 2, wherein:
the straight line of the edge E or the edge F forms an included angle of 5-85 degrees with the perpendicular bisector B respectively.
5. A bipolar plate as set forth in claim 1, wherein: the bipolar plate is provided with 4 through holes which are used as the inflow and outflow ports of the positive and negative electrolytes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821972326.0U CN209104276U (en) | 2018-11-28 | 2018-11-28 | A kind of bipolar plates suitable for rectangle flow battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534775A (en) * | 2019-09-03 | 2019-12-03 | 中国科学院金属研究所 | A kind of flow battery positive and negative anodes electrolyte migration control method |
| CN111244494A (en) * | 2018-11-28 | 2020-06-05 | 中国科学院大连化学物理研究所 | Bipolar plate suitable for rectangular flow battery and application |
| CN112447995A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Flow battery bipolar plate and application |
| CN112447997A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Flow battery galvanic pile bipolar plate and application |
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2018
- 2018-11-28 CN CN201821972326.0U patent/CN209104276U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244494A (en) * | 2018-11-28 | 2020-06-05 | 中国科学院大连化学物理研究所 | Bipolar plate suitable for rectangular flow battery and application |
| CN112447995A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Flow battery bipolar plate and application |
| CN112447997A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Flow battery galvanic pile bipolar plate and application |
| CN112447997B (en) * | 2019-08-28 | 2023-11-17 | 中国科学院大连化学物理研究所 | Flow battery pile bipolar plate and application |
| CN112447995B (en) * | 2019-08-28 | 2024-05-24 | 中国科学院大连化学物理研究所 | Flow battery bipolar plate and application |
| CN110534775A (en) * | 2019-09-03 | 2019-12-03 | 中国科学院金属研究所 | A kind of flow battery positive and negative anodes electrolyte migration control method |
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