CN112447998B - Bipolar plate suitable for flow battery pile and application - Google Patents
Bipolar plate suitable for flow battery pile and application Download PDFInfo
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- CN112447998B CN112447998B CN201910802070.1A CN201910802070A CN112447998B CN 112447998 B CN112447998 B CN 112447998B CN 201910802070 A CN201910802070 A CN 201910802070A CN 112447998 B CN112447998 B CN 112447998B
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- 239000003792 electrolyte Substances 0.000 claims abstract description 68
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
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- 230000003313 weakening effect Effects 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000010248 power generation Methods 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
- 230000009471 action Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- H01M8/02—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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
-
- 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
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
-
- 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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
A bipolar plate suitable for a flow battery or a galvanic pile is a rectangular flat plate-shaped 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 flat plate, which is called an electrode area; electrolyte flows into the electrode area from one rectangular side of the rectangular area and flows out of the electrode area from the other rectangular side parallel to the rectangular area, wherein the inflow side is called an electrode area inlet side, the outflow side is called an electrode area outlet side, and the other two rectangular sides parallel to each other are called left and right sides; the bipolar plate is simple in structure and convenient to process, the uniformity of the flowing of the electrolyte is effectively improved by promoting the electrolyte to flow along the direction parallel to the section of the inlet and the outlet, the local effect is relieved, and the performance of the battery is improved.
Description
Technical Field
The invention relates to the field of flow batteries, in particular to a flow battery or a galvanic pile bipolar plate.
Background
With the prominence of energy problems, renewable energy has received increasing attention. An ideal way to utilize renewable energy is renewable energy to generate electricity, which is clean and convenient. However, renewable energy power generation has various problems such as discontinuity and instability, and in order to realize efficient utilization of renewable energy power generation, intervention of energy storage equipment is required. Among the energy storage technologies, the flow battery technology is favored because of its advantages of independent design of capacity and power, high safety, environmental friendliness, and the like. In the running process of the flow battery, electrolyte dissolved with active substances flows inside the battery or the electric pile through the action of a pump and performs electrochemical reaction on the porous electrode, so that energy storage and release are realized. In flow batteries, the flow characteristics of the electrolyte are closely related to the battery performance. The uniformity of electrolyte distribution directly affects the performance of the cell and stack. In the existing flow field structure of the flow battery, the electrolyte is not uniformly distributed, especially in the direction parallel to the inlet and outlet cross sections, which can affect the utilization of active substances and cause adverse effects such as low voltage efficiency, material corrosion and the like.
Disclosure of Invention
Aiming at the problem that electrolyte in the flow battery is unevenly distributed on the section parallel to the inlet and the outlet, the invention provides a novel flow battery or a galvanic pile bipolar plate structure with a flow guiding structure, which has simple structure and convenient processing. Meanwhile, the proper flow guide grooves have the advantage of increasing the updating speed of the electrolyte, can reduce the gradient of the concentration of active substances in the electrolyte in the direction vertical to the section of the inlet and the outlet, finally reduce the overall polarization of the battery and the electric pile, eliminate the local corrosion of key materials and improve the power density and the operation stability of the battery. Has important significance for the development and application of the flow battery.
In order to achieve the above purpose, the specific technical scheme provided by the invention is as follows:
a bipolar plate suitable for use in a flow battery or stack, characterized by: the bipolar plate is of a rectangular flat plate structure, and a rectangular area for contacting with the electrode is formed in the middle of one side surface or two side surfaces of the flat plate, which is called an electrode area; electrolyte flows into the electrode area from one rectangular side of the rectangular area and flows out of the electrode area from the other rectangular side parallel to the rectangular area, wherein the inflow side is called an electrode area inlet side, the outflow side is called an electrode area outlet side, and the other two rectangular sides parallel to each other are called left and right sides; the electrode area of the bipolar plate is provided with more than 2 rows of first groove groups at equal intervals from an inlet side to an outlet side, each row of first groove groups is composed of more than 2 equally-spaced strip-shaped first diversion grooves parallel to the left side and the right side, the first diversion grooves are positioned on the left side and the right side of a plane A where the surface of the bipolar plate is positioned and are parallel to the left side and the right side, the first diversion grooves between the adjacent 2 rows of first groove groups are in one-to-one correspondence, and the left side and the right side corresponding to the first diversion grooves are respectively positioned on two parallel straight lines; namely, the projection of more than 2 rows of first groove groups on the left side and the right side is a broken line formed by line segments at intervals, and each line segment corresponds to one row of first groove groups; the electrode area of the bipolar plate is provided with more than 2 rows of second groove groups at equal intervals from the inlet side to the outlet side, each row of second groove groups is composed of more than 2 equally-spaced strip-shaped second diversion grooves parallel to the left side and the right side, the second diversion grooves are positioned on the left side and the right side of a plane A where the surface of the bipolar plate is positioned and are parallel to the left side and the right side, the second diversion grooves between the adjacent 2 rows of second groove groups are in one-to-one correspondence, and the left side and the right side corresponding to the second diversion grooves are respectively positioned on two parallel straight lines; namely, the projection of more than 2 rows of second groove groups on the left side and the right side is a broken line formed by line segments at intervals, and each line segment corresponds to one row of second groove groups; the second groove groups and the first groove groups are mutually spaced, namely 2 rows of adjacent second groove groups are spaced by 1 row of first groove groups; the first diversion trenches and the second diversion trenches in the adjacent first groove group and second groove group are sequentially staggered, namely, the projection A of the first diversion trench in the first groove group on the inlet side and the projection B of the second diversion trench in the second groove group on the inlet side are sequentially staggered at equal intervals; i.e. two adjacent projections B are separated by 1 projection a; and in the adjacent first groove group and second groove group, one end of the first or second groove group close to the inlet side, which is far away from the inlet side, of the first or second diversion groove is connected with one end of the second or first groove group close to the inlet side, which is close to the left side and the right side, which is close to the left side and is far away from the inlet side, of the second or first diversion groove is connected with one end of the second or first diversion groove close to the inlet side, which is close to the right side, of the second or first diversion groove is connected with the third diversion groove.
The design standard of the battery or the electric pile is as follows:
the first or second diversion trench close to the inlet side is directly communicated with the inlet side or is connected with the inlet side through a third diversion trench; the first or second diversion trench near the outlet edge is directly communicated with the outlet edge or is connected with the outlet edge through a third diversion trench; the first or second diversion trench near the left side is directly communicated with the left side or is connected with the left side through a third diversion trench; the first or second diversion trench near the right side is directly communicated with the right side or is connected with the right side through a third diversion trench.
The electrode area is provided with a plurality of groups of hexagonal groove groups which are respectively formed by connecting 6 strip-shaped grooves end to end and are called hexagonal flow guiding structures; electrolyte flows into the hexagonal diversion structure which is attached to the electrolyte from the inlet side and then flows out from the outlet side. The 6 strip-shaped grooves forming each groove group are identical in shape and size; the intersecting parts of 6 strip-shaped grooves forming each groove group are communicated with each other; two adjacent hexagonal groove groups are overlapped by one edge, and the connecting parts of the two hexagonal groove groups are communicated. The first diversion trench or the second diversion trench is positioned at the left and right sides of the plane A where the bipolar plate body is positioned, and the third diversion trench connected with the left and right sides of the plane A where the bipolar plate body is positioned form an included angle of 120 degrees.
The hexagonal flow guiding structure is axisymmetric on the plane A of the plate body by a perpendicular bisector B of the inlet side of the electrode area; the section of the hexagonal flow guiding structure parallel to the plane A is a hexagonal ring C, six edges of the hexagonal ring C corresponding to the sections of the six grooves are isosceles trapezoids D, and two opposite edges of the hexagonal ring C correspond to the bottom edges of the isosceles trapezoids; the trapezoid bottom edges corresponding to two edges in the 6 edges of the hexagonal ring C are parallel or coincident with the perpendicular bisector B.
At the left and right sides of the electrode region, when one of the six edges of the hexagonal ring C overlaps with the side, no groove is provided at the overlapping portion. The hexagonal flow guiding structure is attached to the outlet edge, or a rectangular gap is reserved between the hexagonal flow guiding structure and the outflow side edge.
The occupied area of the groove on the plane of the plate body is 10-90% of the area of the electrode area on the plane of the plate body.
Preferably, the width of the strip-shaped groove forming the hexagonal flow guiding structure is 0.1-50 mm, and the depth is 0.1-50 mm.
Preferably, the width and height/depth of the elongated grooves constituting the hexagonal flow guiding structure are the same, or follow the principle that the width and/or depth/height of the flow guiding quadrangular structure near the midpoint of the electrode area electrolyte inflow and outflow section is narrower and/or the width and/or depth/height is wider away from the end.
Preferably, the diameter of the inflow and outflow opening of the electrolyte is 1 to 100mm.
The width of the plate body around the upper electrode area of the plate body is 1-200 mm; the thickness of the plate body is 0.2-60 mm.
Preferably, the intersections of the corners inside the strip-shaped grooves forming the hexagonal flow guiding structure and the edges are arc-shaped transition.
The bipolar plate provided by the invention can be made of graphite and other materials, but is not limited to the materials. The groove structure on the plate body can be formed by mechanical processing and carving, hot pressing and the like, but is not limited to the above.
Compared with the prior art, the bipolar plate structure adopted by the invention can obviously improve the uniformity of electrolyte distribution, thereby ensuring the uniformity of internal reaction of the battery and the electric pile, weakening local effect, improving the uniformity of electrolyte distribution in the inlet and outlet directions by adjusting the height or depth of the groove, and improving the utilization rate of the electrolyte and the overall efficiency of the electric pile. Particularly for high-power galvanic pile, the cost can be effectively reduced.
The technical proposal of the invention has the beneficial effects that
The bipolar plate is simple in structure and convenient to process, the uniformity of the flowing of the electrolyte is effectively improved by promoting the electrolyte to flow along the direction parallel to the section of the inlet and the outlet, the local effect is relieved, and the performance of the battery is improved. Specifically:
when the bipolar plate without the flow guiding structure is adopted, electrolyte flows in the direction perpendicular to the inlet section and flows out in the direction perpendicular to the outlet section under the influence of pressure gradient when entering the electrode area from the inlet section, namely, most of the electrolyte flows in the direction parallel to the normal direction of the inlet and outlet sections, so that the electrolyte flows unevenly in the direction parallel to the inlet and outlet sections, and particularly when the inlet and outlet flow guiding channels are not designed reasonably, the problem is serious, and when the conventional serpentine, parallel, interdigital and other channels are adopted, obvious uneven flow can occur at the boundary of the electrode area and the adjacent and turning parts of the channels due to the limitation of the channel structure. Electrolyte flow non-uniformity can form electrolyte stagnant areas and even flow dead areas, electrolyte update rates in the stagnant areas and the flow dead areas are slow, so that active substances are rapidly reduced along with the progress of reaction (as shown in figure 1), obvious polarization is caused, the overall performance of the battery is reduced, meanwhile, the battery and pile materials are locally corroded, and the service life is shortened.
By designing the hexagonal grooves on the bipolar plate, as the electrodes for the flow battery are mostly made of porous materials, the flow resistance in the grooves is smaller, and the flow rate of electrolyte in the electrodes is smaller than that in the grooves, so that the electrolyte is split in the layers in the grooves, and uniform flow and distribution in the direction parallel to the inlet and outlet cross sections are realized, thereby improving the uniformity of active material distribution, reducing polarization, weakening local effects and finally improving the overall performance of the battery and the galvanic pile.
Drawings
FIG. 1 is a schematic diagram of internal concentration distribution in the discharging process of a rectangular flow battery
FIG. 2 example 1 schematic view
FIG. 3 example 2 schematic view
FIG. 4 is a schematic diagram of comparative example 3
FIG. 5 is a schematic diagram of comparative example 4;
symbol description:
the cathode electrolyte flow inlet is formed by a 1-cathode electrolyte flow inlet, a 2-plate body, a 3-electrode area inlet edge, a 4-electrode area, a 5-hexagon flow guiding structure, a 6-anode electrolyte flow inlet, a 7-electrode area left side and right side edge, an 8-cathode electrolyte flow outlet, a 9-electrode area outlet edge and a 10-anode electrolyte flow outlet.
Detailed Description
Example 1
As shown in fig. 2, a flow battery bipolar plate. The graphite-pressed bipolar plate is formed by pressing graphite and comprises a bipolar plate body 2, wherein a negative electrode electrolyte flow inlet 1, a negative electrode electrolyte flow outlet 8, a positive electrode electrolyte flow inlet 6 and a positive electrode electrolyte flow outlet 10 are arranged on the bipolar plate body. Wherein the negative electrode electrolyte flow inlet 1 and the positive electrode electrolyte flow inlet 6 are positioned on the lower bottom side of the plate body, and the negative electrode electrolyte flow outlet 8 and the positive electrode electrolyte flow outlet 10 are positioned on the upper bottom side of the plate body. The middle part of the plate body is provided with an electrode area 4 which is rectangular, a hexagonal flow guiding structure is arranged in the electrode area, all hexagons are regular hexagons, and each hexagon is formed by connecting six strip-shaped grooves with the same length in an end-to-end mode.
The thickness of the plate body is 6mm; the negative electrode electrolyte flow inlet 1, the negative electrode electrolyte flow outlet 8, the positive electrode electrolyte flow inlet 6 and the positive electrode electrolyte flow outlet 10 are all round, and have the diameter of 12mm; in the rectangle where the electrode area is located, the sides as the inlet and outlet sides are 300mm long and the left and right sides are 200mm long. The depth of the hexagonal flow guiding structure is 1.5mm, the hexagonal flow guiding structure consists of 87 quadrilateral grooves with the length of 34.6mm and the width of 2mm, two long sides of the six grooves forming each complete regular hexagon are perpendicular to the inlet and outlet sides of the electrode area, and two adjacent hexagons have and only one side is completely overlapped.
The two sides of the plate body are provided with the same hexagonal flow guiding structure; all the intersection points with corners are in arc transition. The grooves on the bipolar plate are engraved by machining.
Example 2
As shown in fig. 3, a flow battery bipolar plate. The graphite-pressed bipolar plate is formed by pressing graphite and comprises a bipolar plate body 2, wherein a negative electrode electrolyte flow inlet 1, a negative electrode electrolyte flow outlet 8, a positive electrode electrolyte flow inlet 6 and a positive electrode electrolyte flow outlet 10 are arranged on the bipolar plate body. Wherein the negative electrode electrolyte flow inlet 1 and the positive electrode electrolyte flow inlet 6 are positioned on the lower bottom side of the plate body, and the negative electrode electrolyte flow outlet 8 and the positive electrode electrolyte flow outlet 10 are positioned on the upper bottom side of the plate body. The middle part of the plate body is provided with an electrode area 4 which is rectangular, a hexagonal flow guiding structure is arranged in a half area of the electrode area, which is close to the electrolyte flow inlet, the hexagonal flow guiding structure consists of a plurality of long strip grooves, all hexagons are regular hexagons, and each hexagon is formed by connecting six long strip grooves with the same length in an end-to-end mode.
The thickness of the plate body is 6mm; the negative electrode electrolyte flow inlet 1, the negative electrode electrolyte flow outlet 8, the positive electrode electrolyte flow inlet 6 and the positive electrode electrolyte flow outlet 10 are all round, and have the diameter of 12mm; in the rectangle in which the electrode areas are located, the sides as the inlet and outlet sides are 250mm long, and the other two sides are 180mm long. The depth of the hexagonal flow guiding structure is 2mm, the hexagonal flow guiding structure consists of 44 quadrilateral grooves with the length of 28.9mm and the width of 3mm, two grooves in six grooves forming each complete regular hexagon are positioned in the section quadrilateral on the plane of the plate body, a group of opposite sides are perpendicular to the inlet and outlet sides of the electrode area, and the grooves corresponding to one side of the adjacent two hexagons are completely overlapped.
All the intersection points with corners are in arc transition. The grooves on the bipolar plate are engraved by machining.
Comparative example 3
Comparative example 3 a bipolar plate with interdigitated flow channels was used and the structure is shown in figure 4.
The thickness of the plate body is 6mm; the negative electrode electrolyte flow inlet 1, the negative electrode electrolyte flow outlet 8, the positive electrode electrolyte flow inlet 6 and the positive electrode electrolyte flow outlet 10 are all round, and have the diameter of 15mm; in the rectangle in which the electrode areas are located, the sides which are the inlet and outlet sides are 240mm long, and the other two sides are 290mm long. The width of the flow channel is 5mm, the depth is 3mm, and the inlet half branch and the outlet half branch are respectively composed of a main flow channel and 6 branch flow channels. The length of the main runner is 220mm, and the length of the branch runner is 260mm. All corners are in arc chamfer transition.
Comparative example 4
Comparative example 4 is a flat plate without a hexagonal flow guiding structure, the structure is shown in fig. 5. Taking an all-vanadium redox flow battery as an example, commercial software package COMSOL Multiphysics is utilized @ Performing simulation calculation, wherein a mathematical model used for simulation mainly comprises:
momentum conservation and continuity equation:
wherein,and P represents the velocity vector and pressure, μ and μ, respectively * The intrinsic viscosity and the effective viscosity of the electrolyte are shown, respectively, and K represents the permeability of the porous medium (porous electrode) as determined by the Carman-Kozeny equation.
Conservation of materials equation:
wherein c i For the concentration of material i, S i Is 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:
wherein the inlet pressure is set to 20000Pa and the outlet pressure is set to 0Pa.
In the model, the concentration of inlet vanadium ions is correlated with the charge-discharge state (SoC) to eliminate the effect of reaction time. The diffusion flux of all materials at the outlet was set to 0 based on the assumption of a sufficiently developed flow. The wall boundary was set to 0 flux. The specific expression is:
and->The initial concentration of vanadium ions in the positive and negative electrodes, respectively, was set to 1500mol m in this model -3 . Model convergence relative error factor of 1×10 -6 . See for details of the relevant mathematical modelYue,M.,et al.(2018)."Flow field design and optimization of high power density vanadium flow batteries:A novel trapezoidflow battery."Aiche Journal 64.
Carbon felt with thickness of 5mm is used as an electrode, and the thickness is 180mA cm -2 The results of the simulation calculations for the examples and comparative examples are shown in the following table, when the SoC is 60% for the current density of (c):
therefore, the bipolar plate can remarkably improve the uniformity of electrolyte distribution. Thereby weakening local effect and improving pile efficiency and operation stability.
Claims (9)
1. A bipolar plate suitable for use in a flow battery or stack, characterized by: the bipolar plate is of a rectangular flat plate structure, and a rectangular area for contacting with the electrode is formed in the middle of one side surface or two side surfaces of the flat plate, which is called an electrode area; electrolyte flows into the electrode area from one rectangular side of the rectangular area and flows out of the electrode area from the other rectangular side parallel to the rectangular area, wherein the inflow side is called an electrode area inlet side, the outflow side is called an electrode area outlet side, and the other two rectangular sides parallel to each other are called left and right sides;
the electrode area of the bipolar plate is provided with more than 2 rows of first groove groups at equal intervals from an inlet side to an outlet side, each row of first groove groups is composed of more than 2 equally-spaced strip-shaped first diversion grooves parallel to the left side and the right side, the first diversion grooves are positioned on the left side and the right side of a plane A where the surface of the bipolar plate is positioned and are parallel to the left side and the right side, the first diversion grooves between the adjacent 2 rows of first groove groups are in one-to-one correspondence, and the left side and the right side corresponding to the first diversion grooves are respectively positioned on two parallel straight lines; namely, the projection of more than 2 rows of first groove groups on the left side and the right side is a broken line formed by line segments at intervals, and each line segment corresponds to one row of first groove groups;
the electrode area of the bipolar plate is provided with more than 2 rows of second groove groups at equal intervals from the inlet side to the outlet side, each row of second groove groups is composed of more than 2 equally-spaced strip-shaped second diversion grooves parallel to the left side and the right side, the second diversion grooves are positioned on the left side and the right side of a plane A where the surface of the bipolar plate is positioned and are parallel to the left side and the right side, the second diversion grooves between the adjacent 2 rows of second groove groups are in one-to-one correspondence, and the left side and the right side corresponding to the second diversion grooves are respectively positioned on two parallel straight lines; namely, the projection of more than 2 rows of second groove groups on the left side and the right side is a broken line formed by line segments at intervals, and each line segment corresponds to one row of second groove groups;
the second groove groups and the first groove groups are mutually spaced, namely 2 rows of adjacent second groove groups are spaced by 1 row of first groove groups; the first diversion trenches and the second diversion trenches in the adjacent first groove group and second groove group are sequentially staggered, namely, the projection A of the first diversion trench in the first groove group on the inlet side and the projection B of the second diversion trench in the second groove group on the inlet side are sequentially staggered at equal intervals; i.e. two adjacent projections B are separated by 1 projection a;
in the adjacent first groove group and second groove group, one end of the first or second diversion trench close to the inlet side, which is far away from the inlet side, is connected with one end of the second or first diversion trench close to the inlet side, which is close to the left and right sides and is close to the adjacent second or first diversion trench close to the inlet side, which is far away from the inlet side, through a third diversion trench;
the first or second diversion trench close to the inlet side is directly communicated with the inlet side or is connected with the inlet side through a third diversion trench;
the first or second diversion trench near the outlet edge is directly communicated with the outlet edge or is connected with the outlet edge through a third diversion trench;
the first or second diversion trench near the left side is directly communicated with the left side or is connected with the left side through a third diversion trench;
the first or second diversion trench near the right side is directly communicated with the right side or is connected with the right side through a third diversion trench;
the electrode area is provided with a plurality of groups of hexagonal groove groups which are respectively formed by connecting 6 strip-shaped grooves end to end and are called hexagonal flow guiding structures; electrolyte flows into the hexagonal diversion structure which is attached to the electrolyte from the inlet side and then flows out from the outlet side.
2. The bipolar plate of claim 1, wherein:
the 6 strip-shaped grooves forming each groove group are identical in shape and size;
the intersecting parts of 6 strip-shaped grooves forming each groove group are communicated with each other; two adjacent hexagonal groove groups are overlapped by one edge, and the connecting parts of the two hexagonal groove groups are communicated.
3. The bipolar plate of claim 1, wherein:
the first diversion trench or the second diversion trench is positioned at the left and right sides of the plane A where the bipolar plate body is positioned, and the third diversion trench connected with the left and right sides of the plane A where the bipolar plate body is positioned form an included angle of 120 degrees.
4. The bipolar plate of claim 1, wherein:
the hexagonal flow guiding structure is axisymmetric on the plane A of the plate body by a perpendicular bisector B of the inlet side of the electrode area; the section of the hexagonal flow guiding structure parallel to the plane A is a hexagonal ring C, six edges of the hexagonal ring C corresponding to the sections of the six grooves are isosceles trapezoids D, and two opposite edges of the hexagonal ring C correspond to the bottom edges of the isosceles trapezoids; the trapezoid bottom edges corresponding to two edges in the 6 edges of the hexagonal ring C are parallel or coincident with the perpendicular bisector B.
5. The bipolar plate of claim 4 wherein:
at the left and right sides of the electrode region, when one of the six edges of the hexagonal ring C overlaps with the side, no groove is provided at the overlapping portion.
6. The bipolar plate of claim 1, wherein:
the hexagonal flow guiding structure is attached to the outlet edge, or a rectangular gap is reserved between the hexagonal flow guiding structure and the outflow side edge.
7. The bipolar plate of any one of claims 1-6, wherein: the bipolar plate was provided with 4 through holes as inflow and outflow ports for the positive and negative electrolytes.
8. The bipolar plate of any one of claims 1-6, wherein: the occupied area of the groove on the plane of the plate body is 10% -90% of the area of the electrode area on the plane of the plate body.
9. Use of a bipolar plate according to any of claims 1-6 in a flow battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802070.1A CN112447998B (en) | 2019-08-28 | 2019-08-28 | Bipolar plate suitable for flow battery pile and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802070.1A CN112447998B (en) | 2019-08-28 | 2019-08-28 | Bipolar plate suitable for flow battery pile and application |
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