CN109841873B - Liquid flow frame suitable for flow battery pile - Google Patents
Liquid flow frame suitable for flow battery pile Download PDFInfo
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- CN109841873B CN109841873B CN201711213096.XA CN201711213096A CN109841873B CN 109841873 B CN109841873 B CN 109841873B CN 201711213096 A CN201711213096 A CN 201711213096A CN 109841873 B CN109841873 B CN 109841873B
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- 239000007788 liquid Substances 0.000 title claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 80
- 239000012530 fluid Substances 0.000 claims description 27
- 230000007423 decrease Effects 0.000 claims description 9
- 230000002146 bilateral effect Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract description 2
- 238000009827 uniform distribution Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 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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Abstract
The invention relates to a liquid flow frame suitable for a liquid flow battery pile or a liquid flow battery, wherein the liquid flow frame is of a flat plate-shaped structure with a through hole in the middle, the through hole is an electrode area, the cross section of the through hole parallel to the plane of a plate body is rectangular or isosceles trapezoid, grooves serving as free flow areas of electrolyte are respectively formed in the edges, close to the upper side and the lower side of the through hole, of one side or the lower bottom edge of the trapezoid, of the rectangle are respectively an inlet free flow area, the opposite side of one side or the upper bottom edge of the trapezoid is respectively an outlet free flow area, and more than 2 grooves serving as secondary flow guide channels are formed between each free flow area and the through hole; the liquid flow frame is simple in structure and convenient to process, can effectively improve the uniformity of electrolyte distribution, inhibit local overheating in a galvanic pile, reduce polarization and improve the utilization rate of the electrolyte.
Description
Technical Field
The invention relates to the field of flow batteries, in particular to a rectangular flow battery electrode frame.
Background
Along with the adjustment of the energy structure, renewable energy sources such as wind energy, solar energy and the like are used for generating electricity, but the renewable energy sources have the characteristics of discontinuity, instability and the like, are difficult to directly grid-connect, and have high wind and light rejection rate. An electric energy storage technology represented by a flow battery provides a trigger for solving the problem. The electric push is a core component of the flow battery, and the performance of the electric push is directly related to the performance and cost of the whole system. The electric pile comprises end plates, electrodes, a liquid flow frame, an ion exchange membrane and other parts, wherein the liquid flow frame has the main function of ensuring that electrolyte accurately and reasonably flows into and out of the electrode area and the supporting electrode, so that the electric pile can operate efficiently. Especially in a high-power galvanic pile with a large electrode area, reasonable flow frame design is particularly important for uniform distribution of electrolyte. A novel structure of a trapezoid galvanic pile is proposed in China patent (patent application number: 201410495737.5), and the structure can effectively reduce concentration polarization in an electrode and has high practicability. But the patent does not relate to a flow guiding structure. Meanwhile, it is more difficult to achieve uniform distribution of the electrolyte in the trapezoidal cell stack than in the rectangular cell stack. Even distribution of electrolyte is difficult to achieve if the existing diversion structure is adopted.
Disclosure of Invention
The invention aims at: aiming at the problem of uneven flow velocity distribution of electrolyte in a flow battery, in particular to a flow battery pile in a direction perpendicular to the flow direction, the flow frame suitable for the flow battery pile is provided and researched, the flow frame is simple in structure and convenient to process, and electrolyte can uniformly flow into and out of an electrode reaction area through scientific and reasonable design layout of a flow guide runner, so that uniform distribution of the electrolyte is realized, local thermal effect is weakened, uniformity of electrolyte reaction is improved, concentration polarization is reduced, and the utilization rate of the electrolyte is increased.
In order to achieve the above purpose, the invention adopts the following specific technical scheme:
a flow frame suitable for flow battery stack or flow battery, its characterized in that: the liquid flow frame is of a flat plate-shaped structure with a through hole in the middle, the through hole is an electrode area, the cross section of the through hole parallel to the plane of the plate body is rectangular or isosceles trapezoid, grooves serving as free flow areas of electrolyte are respectively formed in the edges of one side surface or two side surfaces of the flat plate, which are close to the upper side and the lower side of the through hole, the grooves at the edge of one side (the lower bottom edge of the trapezoid) of the rectangle are respectively an inlet free flow area, the grooves at the edge of the other side (the upper bottom edge of the trapezoid) are respectively an outlet free flow area, and more than 2 grooves serving as secondary flow guide channels are formed between each free flow area and the through hole;
Inlet free flow area: A. the groove section of the inlet free flow area parallel to the plane of the plate body is of a bilateral symmetry structure, the width of the groove section gradually decreases from the symmetry center of the inlet free flow area to the bilateral symmetry left and right sides, and the width of the groove section refers to the distance between the side edge of the groove section away from the secondary diversion flow passage and the side edge of the groove section where the secondary diversion flow passage is positioned; the lengths of the secondary diversion flow passages on the inlet free flow areas are equal, and the length of each secondary diversion flow passage refers to the distance between the inlet free flow area at each secondary diversion flow passage and the through hole; a fluid inlet is arranged on the inlet free flow area of the plane of the plate body towards the side far away from the through hole, the fluid inlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an inlet main flow channel is formed in the surface of the plate at the same side edge of the inlet free flow area, one end of the groove of the inlet main flow channel is connected with the fluid inlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow inlet on the plate body;
Or B, the groove section of the inlet free flow area parallel to the plane of the plate body is of two parallelogram structures which are symmetrical left and right, the length of the secondary diversion flow channel on the inlet free flow area gradually decreases from the symmetry center of the inlet free flow area to the left and right sides symmetrically, and the length of the secondary diversion flow channel refers to the distance between the inlet free flow area and the through hole at each secondary diversion flow channel; a fluid inlet is arranged on the inlet free flow area of the plane of the plate body towards the side far away from the through hole, the fluid inlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an inlet main flow channel is formed in the surface of the plate at the same side edge of the inlet free flow area, one end of the groove of the inlet main flow channel is connected with the fluid inlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow inlet on the plate body;
outlet free flow area: A. the groove section of the outlet free flow area parallel to the plane of the plate body is of a bilateral symmetry structure, the width of the groove section gradually decreases from the symmetry center of the outlet free flow area to the bilateral symmetry left and right sides, and the width of the groove section refers to the distance between the side edge of the groove section away from the secondary diversion flow channel and the side edge of the groove section where the secondary diversion flow channel is located; the lengths of the secondary diversion flow passages on the outlet free flow areas are equal, and the length of each secondary diversion flow passage refers to the distance between the outlet free flow area at each secondary diversion flow passage and the through hole; a fluid outlet is arranged on the side, far away from the through hole, of the outlet free flow area of the plane of the plate body, the fluid outlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an outlet main flow channel is formed in the surface of the plate at the same side edge of the outlet free flow area, one end of the groove of the outlet main flow channel is connected with the fluid outlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow outlet on the plate body;
Or B, the groove section of the outlet free flow area parallel to the plane of the plate body is of a left-right symmetrical two parallelogram structure, the length of the secondary diversion flow channel on the outlet free flow area gradually decreases from the symmetry center of the outlet free flow area to the left-right symmetrical two sides, and the length of the secondary diversion flow channel refers to the distance between the outlet free flow area and the through hole at each secondary diversion flow channel; a fluid outlet is arranged on the side, far away from the through hole, of the outlet free flow area of the plane of the plate body, the fluid outlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an outlet main flow channel is formed in the surface of the plate at the same side edge of the outlet free flow area, one end of the groove of the outlet main flow channel is connected with the fluid outlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow outlet on the plate body;
Preferably, the main flow channel consists of 1 or more than 1 flow channel, and the flow channels are separated by main flow channel rib plates with the thickness of 0.5-10 mm so as to enable electrolyte to uniformly flow into a free flow area, wherein the width of the main flow channel is 1-50 mm, and the depth is 0.5-5 mm; the secondary flow guide channel comprises a plurality of secondary flow guide channels which are divided by secondary flow guide channel rib plates, wherein the width of the secondary flow guide channel is 1-50 mm, the length of the secondary flow guide channel is 1-100 mm, the depth of the secondary flow guide channel is 0.5-5 mm, the width of the secondary flow guide channel rib plates is 1-50 mm, the length of the secondary flow guide channel rib plates is 1-100 mm, and the thickness of the secondary flow guide channel rib plates is 0.5-5 mm; the primary flow guide channel is communicated with the secondary flow guide channel and is intersected at the center of the inlet or outlet section.
The free flow area has a buffer function, so that electrolyte can uniformly flow into the secondary diversion flow channel; the free flow area has an up-down width of 1-50 mm and a depth of 0.5-5 mm.
The inlet secondary diversion flow channel and the outlet secondary diversion flow channel are respectively arranged at the inlet section and the outlet section, and the lengths, the widths and the depths of the secondary diversion flow channels at the left side and the right side are kept symmetrical and consistent so as to achieve the purpose of uniform distribution.
Preferably, a protective cover plate for forming a closed flow passage with the electrode frame can be arranged above the main flow guide channel, the secondary flow guide channel and the free flow area, and the thickness of the protective cover plate is 0.5-10 mm. If the protective cover plate is not arranged, the electrode frame can be directly contacted with the bipolar plate to form a closed flow channel.
Preferably, the diameter of the inflow and outflow openings of the positive and negative electrode electrolytes is 1 to 50mm.
The frame electrode area is trapezoidal, and the long bottom edge of the trapezoid, which is close to the side of the main flow inlet of the positive electrode electrolyte and the negative electrode electrolyte, is relatively measured to be the short bottom edge; the frame body is provided with the main inflow and outflow openings of the positive and negative electrolyte and the main and secondary diversion flow channels, the widths of the frame bodies at the two sides are 5-200 mm, the widths of the frame bodies at the two sides of the areas which are not provided with the areas are 1-100 mm, and the thicknesses of the electrode frames are 0.5-50 mm.
Preferably, the intersections of the inner corners of the main diversion flow channel, the secondary diversion flow channel and the free flow area and the edges are arc-shaped transition.
The electrode frame provided by the invention can be made of polyethylene, polypropylene, polyvinyl chloride and other materials, but is not limited to the materials. The main flow guide channel and the secondary flow guide channel on the frame body can be formed by mechanical processing, engraving, injection molding and the like, but the flow guide device is not limited to the above.
Compared with the prior art, the electrode frame mechanism is particularly suitable for the trapezoid flow battery, but the uniformity of electrolyte distribution is greatly improved, so that the internal reaction of the battery and a pile is ensured to be uniform, the local heat release is weakened, the polarization is reduced, and the utilization rate of the electrolyte is extremely high. Particularly for high-power galvanic pile, the cost can be effectively reduced, and the material is saved.
3. The technical proposal of the invention has the beneficial effects that
The liquid flow frame is simple in structure and convenient to process, can effectively improve the uniformity of electrolyte distribution, inhibit local overheating in a galvanic pile, reduce polarization and improve the utilization rate of the electrolyte. Specifically:
According to the basic principle of fluid mechanics, when electrolyte flows in the electrode area, the fluid distribution amount is smaller and the speed is smaller from the middle part to the two ends on the inlet section; the outlet section is from the middle to the two ends, the fluid distribution amount is larger and the flow velocity is larger. Therefore, the length of the inlet secondary diversion flow passage is designed to be shorter from the middle part of the inlet section to the two ends, the length of the outlet secondary diversion flow passage is designed to be shorter from the middle part of the outlet section to the two ends, and uneven flow velocity distribution in the direction of the inlet section and the outlet section is eliminated by utilizing the change of the length of the secondary diversion flow passage, so that electrolyte can uniformly flow into and out of an electrode area, a flow dead zone is eliminated, and the utilization rate of the electrolyte is increased. In addition, a similar effect can be achieved by designing the inlet free flow area width to be narrower from the middle of the inlet section to the two ends, and the outlet free flow area width to be smaller from the middle of the outlet section to the two ends.
Drawings
FIG. 1 flow box 1;
FIG. 2 flow box 2;
Symbol description:
The cathode electrolyte main flow inlet, the 2-inlet secondary flow guide channel, the 3-inlet secondary flow guide channel rib plate, the 4-inlet free flow area, the 5-inlet main flow guide channel rib plate, the 6-inlet main flow guide channel, the 7-cathode electrolyte main flow inlet, the 8-inlet cross section, the 9-cathode electrode area, the 10-cathode electrolyte main flow outlet, the 11-outlet secondary flow guide channel, the 12-outlet secondary flow guide channel rib plate, the 13-outlet free flow area, the 14-outlet main flow guide channel rib plate, the 15-outlet main flow guide channel, the 16-cathode electrolyte main flow outlet, the 17-outlet cross section and the 18-frame body.
Detailed Description
Example 1
As shown in fig. 1, a flow frame for a flow battery. The cathode electrolyte main flow inlet 7, the anode electrolyte main flow inlet 1, the cathode electrolyte main flow outlet 16 and the anode electrolyte main flow outlet 10 are arranged on the frame body 20. Wherein the main electrolyte inlet 7 and the main electrolyte inlet 1 are positioned on the same side of the frame, and the main electrolyte outlet 16 and the main electrolyte outlet 10 are positioned on the same side of the frame; the main positive electrolyte flow inlet 7 and the main positive electrolyte flow outlet 16 are positioned on two opposite sides of the frame body, and the main negative electrolyte flow inlet 1 and the main negative electrolyte flow outlet 10 are positioned on two opposite sides of the frame body. The inner edges of two sides of the frame body provided with the main inflow and outflow openings of the positive and negative electrolyte are provided with an inlet secondary diversion flow passage 2 and an outlet secondary diversion flow passage 11 which are connected with the electrode area 9. Taking an anode diversion flow passage as an example, an anode electrolyte main flow inlet 7 is communicated with an electrode area 9 through an inlet main diversion flow passage 6, an inlet free flow area 4 and an inlet secondary diversion flow passage 2; the main flow outlet 16 of the positive electrolyte is in communication with the electrode area 9 via the main outlet flow channel 15, the free outlet flow area 13 and the secondary outlet flow channel 11. The inlet main flow channel and the outlet main flow channel are respectively divided into two flow channels by an inlet main flow channel rib plate 5 and an outlet main flow channel rib plate 14; the inlet and outlet secondary diversion flow passages respectively comprise 30 and 20 small flow passages divided by the inlet secondary diversion flow passage rib plate 3 and the outlet secondary diversion flow passage rib plate 12, the widths of the secondary diversion flow passages gradually increase from the middle part to the two ends of the inlet section 8 and the outlet section 17, and the widths of the corresponding secondary diversion flow passage rib plates gradually decrease, so that electrolyte is distributed more uniformly.
The diameter of the main flow inlet 7 of the positive electrolyte is 14mm; the inlet main flow channel 6 and the outlet main flow channel 15 are both composed of two channels, and the width is 6mm and the depth is 2mm; the inlet main flow channel rib plate 5 and the outlet main flow channel rib plate 14 are respectively positioned at the middle parts of the inlet main flow channel 6 and the outlet main flow channel 15, and have the width of 2mm and the height of 2mm. The inlet main guide flow channel rib 5 and the outlet main guide flow channel rib 14 are connected with the inlet secondary guide flow channel rib 3 and the outlet secondary guide flow channel 11 at the middle parts of the inlet section 8 and the outlet section 17 respectively. The inlet free flow area 4 and the outlet free flow area 13 are each 5mm wide and 2mm deep. The depth of the secondary diversion flow passage of the inlet and the outlet is 2mm, and the direction is along the radial direction of the sector where the positive electrode area is located; the lengths of the inlet secondary diversion flow channel 2 and the inlet secondary diversion flow channel rib plates 3 from the midpoint to the two ends of the inlet section 8 are smaller and smaller, and are bilaterally symmetrical, one sides of the inlet secondary diversion flow channel 2 and the inlet secondary diversion flow channel rib plates 3, which are close to the main inlet 7 of the positive electrolyte, are positioned on two bilaterally symmetrical straight lines, the length of the inlet secondary diversion flow channel rib plates 3 at the midpoint of the inlet section 8 is 25mm, and the length of the inlet secondary diversion flow channel 2 at the left end point or the right end point of the inlet section 4 is 5mm; the lengths of the outlet secondary diversion flow channel 11 and the outlet secondary diversion flow channel rib plates 12 from the midpoint of the outlet section 17 to the two ends are smaller and smaller, and are bilaterally symmetrical, one sides of the outlet secondary diversion flow channel 11 and the outlet secondary diversion flow channel rib plates 12, which are close to the main flow outlet 16 of the positive electrolyte, are positioned on two bilaterally symmetrical straight lines, the length of the outlet secondary diversion flow channel rib plates 12 is 10mm at the midpoint of the outlet section 17, and the length of the outlet secondary diversion flow channel 11 is 5mm at the left end point or the right end point of the outlet section 17; the heights of the rib plates of the secondary diversion flow passages at the inlet and the outlet are 2mm; the widths of the secondary diversion flow passages from the middle point to the two ends of the inlet cross section are sequentially 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm and 8.5mm; the widths of the rib plates of the secondary diversion flow passage of the inlet are as follows in sequence: 19mm, 12mm, 11.5mm, 11mm, 10.5mm, 10mm, 9.5mm, 9mm, 8.5mm, 8mm, 7.5mm, 7mm, 6.5mm, 6mm, 5.5mm; the widths of the secondary diversion flow passages from the middle point of the outlet section to the outlets at the two ends are sequentially 1.6mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm and 6mm; the width of the rib plate of the secondary flow guide channel of the outlet is as follows in sequence: 20.8mm, 13mm, 12.5mm, 12mm, 11.5mm, 11mm, 10.5mm, 10mm, 9.5mm, 9mm. The widths of the rib plates of the inlet secondary flow guide channel, the outlet secondary flow guide channel and the inlet secondary flow guide channel are measured along the inlet section or the outlet section. All the intersection points with corners are in arc transition. The electrolyte main flow guide channel and the secondary flow guide channel on the electrode frame are engraved by mechanical processing.
Example 2
As shown in fig. 2, a flow frame for a flow battery. The cathode electrolyte main flow inlet 7, the anode electrolyte main flow inlet 1, the cathode electrolyte main flow outlet 16 and the anode electrolyte main flow outlet 10 are arranged on the frame body 20. Wherein the main electrolyte inlet 7 and the main electrolyte inlet 1 are positioned on the same side of the frame, and the main electrolyte outlet 16 and the main electrolyte outlet 10 are positioned on the same side of the frame; the main positive electrolyte flow inlet 7 and the main positive electrolyte flow outlet 16 are positioned on two opposite sides of the frame body, and the main negative electrolyte flow inlet 1 and the main negative electrolyte flow outlet 10 are positioned on two opposite sides of the frame body. The inner edges of two sides of the frame body provided with the main inflow and outflow openings of the positive and negative electrolyte are provided with an inlet secondary diversion flow passage 2 and an outlet secondary diversion flow passage 11 which are connected with the electrode area 9. Taking an anode diversion flow passage as an example, an anode electrolyte main flow inlet 7 is communicated with an electrode area 9 through an inlet main diversion flow passage 6, an inlet free flow area 4 and an inlet secondary diversion flow passage 2; the main flow outlet 16 of the positive electrolyte is in communication with the electrode area 9 via the main outlet flow channel 15, the free outlet flow area 13 and the secondary outlet flow channel 11. The inlet main flow channel and the outlet main flow channel are respectively divided into two flow channels by an inlet main flow channel rib plate 5 and an outlet main flow channel rib plate 14; the inlet and outlet secondary diversion flow passages respectively comprise 30 and 20 small flow passages divided by the inlet secondary diversion flow passage rib plate 3 and the outlet secondary diversion flow passage rib plate 12, so that electrolyte is distributed more uniformly.
The diameter of the main flow inlet 7 of the positive electrolyte is 14mm; the inlet main flow channel 6 and the outlet main flow channel 15 are both composed of two channels, and the width is 6mm and the depth is 2mm; the inlet main flow channel rib plate 5 and the outlet main flow channel rib plate 14 are respectively positioned at the middle parts of the inlet main flow channel 6 and the outlet main flow channel 15, and have the width of 2mm and the height of 2mm. The inlet main guide flow channel rib 5 and the outlet main guide flow channel rib 14 are connected with the inlet secondary guide flow channel rib 3 and the outlet secondary guide flow channel 11 at the middle parts of the inlet section 8 and the outlet section 17 respectively. The inlet free flow area 4 and the outlet free flow area 13 are each 2mm deep; the width of the inlet free flow area 4 is narrower and narrower from the midpoint to the two ends along the inlet section 8, the width of the inlet free flow area 4 is 15mm at the midpoint of the inlet section 8, and the width of the inlet free flow area 4 is 5mm at the left end point or the right end point of the inlet section 8; the width of the outlet free flow area 13 is smaller and smaller from the midpoint of the outlet section 17 to the two ends and is symmetrical left and right, the width of the outlet free flow area 13 is 15mm at the midpoint of the outlet section 17, and the width of the outlet free flow area 13 is 4mm at the left end point or the right end point of the outlet section 17. The depth of the secondary diversion flow passage of the inlet and the outlet is 2mm, the direction is along the radial direction of the sector where the positive electrode area is located, and the length is 4mm; the heights of the rib plates of the secondary diversion flow passages at the inlet and the outlet are 2mm; the inlet secondary flow guide flow channel and the inlet secondary flow guide flow channel rib plates are distributed symmetrically left and right along the midpoint of the inlet section, and the outlet secondary flow guide flow channel rib plates are distributed symmetrically left and right along the midpoint of the outlet section; the width of the secondary diversion flow passage of the inlet is 4mm; the width of the rib plate of the secondary flow guide channel of the inlet positioned at the midpoint of the inlet section is 14mm, and the width of the rib plate of the secondary flow guide channel of the other inlet is 9.5mm; the width of the secondary diversion flow passage of the outlet is 4mm; the width of the rib plate of the secondary flow guide channel of the outlet positioned at the midpoint of the outlet section is 16mm, and the width of the rib plate of the secondary flow guide channel of the other outlets is 10.5mm; the widths of the rib plates of the inlet secondary flow guide channel, the outlet secondary flow guide channel and the inlet secondary flow guide channel are measured along the inlet section or the outlet section. All the intersection points with corners are in arc transition. The electrolyte main flow guide channel and the secondary flow guide channel on the electrode frame are engraved by mechanical processing.
Comparative example 3
The structure of the comparative electrode frame is shown in FIG. 2 (b) of China patent (patent application No. 200810011542.3). Taking an all-vanadium redox flow battery as an example, a commercial software package COMSOL Multiphysics @ is utilized to perform simulation calculation, and a mathematical model used for simulation mainly comprises:
momentum conservation and continuity equation:
Wherein, And P represents the velocity vector and pressure, respectively, mu and mu * represent the intrinsic viscosity and effective viscosity of the electrolyte, respectively, and K represents the permeability of the porous medium (porous electrode), as determined by the Carman-Kozeny equation.
Boundary conditions and initial conditions:
wherein the inlet pressure is 24000Pa, the outlet pressure is 0Pa, and the relative error factor of model convergence is 1×10 -6.
The results are shown in the following table:
| Sequence number | Pressure difference of inlet section (Pa) | Outlet section pressure difference (Pa) |
| Comparative example | 1018 | 1101 |
| Electrode frame 1 | 475 | 574 |
| Electrode frame 2 | 437 | 479 |
It can be seen that the uniformity of the distribution of the electrolyte can be significantly improved by adopting the flow frame of the present invention compared with the structure shown in the Chinese patent (patent application number: 200810011542.3).
Claims (4)
1. A flow frame suitable for flow battery stack or flow battery, its characterized in that: the liquid flow frame is of a flat plate-shaped structure with a through hole in the middle, the through hole is an electrode area, the cross section of the through hole parallel to the plane of the plate body is rectangular or isosceles trapezoid, grooves serving as free flow areas of electrolyte are respectively formed in the edges of one side surface or two side surfaces of the flat plate, which are close to the upper side and the lower side of the through hole, the grooves at the edge of one side or the lower side of the trapezoid are inlet free flow areas, the grooves at the opposite side of one side or the upper side of the trapezoid are outlet free flow areas, and more than 2 grooves serving as secondary flow guide channels are formed between each free flow area and the through hole;
Inlet free flow area: A. the groove section of the inlet free flow area parallel to the plane of the plate body is of a bilateral symmetry structure, the width of the groove section gradually decreases from the symmetry center of the inlet free flow area to the bilateral symmetry left and right sides, and the width of the groove section refers to the distance between the side edge of the groove section away from the secondary diversion flow passage and the side edge of the groove section where the secondary diversion flow passage is positioned; the lengths of the secondary diversion flow passages on the inlet free flow areas are equal, and the length of each secondary diversion flow passage refers to the distance between the inlet free flow area at each secondary diversion flow passage and the through hole; a fluid inlet is arranged on the inlet free flow area of the plane of the plate body towards the side far away from the through hole, the fluid inlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an inlet main flow channel is formed in the surface of the plate at the same side edge of the inlet free flow area, one end of the groove of the inlet main flow channel is connected with the fluid inlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow inlet on the plate body;
Or B, the groove section of the inlet free flow area parallel to the plane of the plate body is of two parallelogram structures which are symmetrical left and right, the length of the secondary diversion flow channel on the inlet free flow area gradually decreases from the symmetry center of the inlet free flow area to the left and right sides symmetrically, and the length of the secondary diversion flow channel refers to the distance between the inlet free flow area and the through hole at each secondary diversion flow channel; a fluid inlet is arranged on the inlet free flow area of the plane of the plate body towards the side far away from the through hole, the fluid inlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an inlet main flow channel is formed in the surface of the plate at the same side edge of the inlet free flow area, one end of the groove of the inlet main flow channel is connected with the fluid inlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow inlet on the plate body;
outlet free flow area: A. the groove section of the outlet free flow area parallel to the plane of the plate body is of a bilateral symmetry structure, the width of the groove section gradually decreases from the symmetry center of the outlet free flow area to the bilateral symmetry left and right sides, and the width of the groove section refers to the distance between the side edge of the groove section away from the secondary diversion flow channel and the side edge of the groove section where the secondary diversion flow channel is located; the lengths of the secondary diversion flow passages on the outlet free flow areas are equal, and the length of each secondary diversion flow passage refers to the distance between the outlet free flow area at each secondary diversion flow passage and the through hole; a fluid outlet is arranged on the side, far away from the through hole, of the outlet free flow area of the plane of the plate body, the fluid outlet is positioned on a symmetrical axis of the cross section of the groove, a groove serving as an outlet main flow channel is formed in the surface of the plate at the same side edge of the outlet free flow area, one end of the groove of the outlet main flow channel is connected with the fluid outlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow outlet on the plate body;
Or B, the groove section of the outlet free flow area parallel to the plane of the plate body is of a left-right symmetrical two parallelogram structure, the length of the secondary diversion flow channel on the outlet free flow area gradually decreases from the symmetry center of the outlet free flow area to the left-right symmetrical two sides, and the length of the secondary diversion flow channel refers to the distance between the outlet free flow area and the through hole at each secondary diversion flow channel; the outlet free flow area on the plane of the plate body is provided with a fluid outlet towards the side far away from the through hole, the fluid outlet is positioned on the symmetrical axis of the cross section of the groove, the surface of the plate at the same side edge of the outlet free flow area is provided with a groove serving as an outlet main flow passage, one end of the groove of the outlet main flow passage is connected with the fluid outlet, and the other end of the groove is connected with a through hole serving as an electrolyte main flow outlet on the plate body.
2. The flow frame of claim 1, wherein: the left side edges of the inlet and outlet free flow areas and the left side edges of the leftmost secondary flow guide channels are located on the leftmost side of the rectangular through hole or the bottom side of the trapezoidal through hole which the inlet and outlet free flow areas are located, and the right side edges of the inlet and outlet free flow areas and the right side edges of the rightmost secondary flow guide channels are located on the rightmost side of the rectangular through hole or the bottom side of the trapezoidal through hole which the inlet and outlet free flow areas are located.
3. A flow frame according to claim 1 or 2, characterized in that: the angle of each secondary diversion flow passage section is a chamfer angle.
4. A flow frame according to claim 1 or 2, characterized in that: the flow frame is provided with 2 through holes which are not communicated with the free flow area and serve as a main flow inlet and a main flow outlet of the electrolyte.
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| CN116508185A (en) * | 2020-10-26 | 2023-07-28 | 威富路技术私人有限公司 | Flow frame for redox flow battery and redox flow battery |
| CN115261907B (en) * | 2022-06-28 | 2024-05-31 | 中国华能集团清洁能源技术研究院有限公司 | Electrode plate, electrolytic tank and electrolytic hydrogen production system |
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| CN105514459A (en) * | 2014-09-24 | 2016-04-20 | 中国科学院大连化学物理研究所 | Mono-trapezoid flow battery, poly-trapezoid flow battery and electric pile thereof |
| JP2017041418A (en) * | 2015-08-21 | 2017-02-23 | 住友電気工業株式会社 | Bipolar plate, cell frame, cell stack and redox flow cell |
| CN207624818U (en) * | 2017-11-28 | 2018-07-17 | 中国科学院大连化学物理研究所 | A kind of liquid flow frame suitable for flow cell pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105514459A (en) * | 2014-09-24 | 2016-04-20 | 中国科学院大连化学物理研究所 | Mono-trapezoid flow battery, poly-trapezoid flow battery and electric pile thereof |
| JP2017041418A (en) * | 2015-08-21 | 2017-02-23 | 住友電気工業株式会社 | Bipolar plate, cell frame, cell stack and redox flow cell |
| CN207624818U (en) * | 2017-11-28 | 2018-07-17 | 中国科学院大连化学物理研究所 | A kind of liquid flow frame suitable for flow cell pile |
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