CN208674270U - A kind of flow battery or pile - Google Patents
A kind of flow battery or pile Download PDFInfo
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- CN208674270U CN208674270U CN201821611406.3U CN201821611406U CN208674270U CN 208674270 U CN208674270 U CN 208674270U CN 201821611406 U CN201821611406 U CN 201821611406U CN 208674270 U CN208674270 U CN 208674270U
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- 239000003792 electrolyte Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000013543 active substance Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 238000004364 calculation method Methods 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
- 229910001456 vanadium ion Inorganic materials 0.000 description 2
- 239000004693 Polybenzimidazole Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002480 polybenzimidazole Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
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- Fuel Cell (AREA)
Abstract
The utility model relates to flow battery fields, in particular to flow battery or electric pile structure, liquid flow frame including flake porous electrode and middle part band and its respective shapes and size through-hole, porous electrode is placed in the middle through-hole of liquid flow frame, it is mutually amplexiformed with the middle through-hole inner wall of liquid flow frame the edge of porous electrode, the through-hole as electrolyte flow channel and the through-hole as electrolyte flow pass are equipped in liquid flow frame, the through-hole of electrolyte flow channel is connected by groove as entrance guiding region or through-hole with middle through-hole, the through-hole of electrolyte flow pass as the groove or through-hole that export water conservancy diversion region with middle through-hole by being connected；It is characterized by: removing entrance guiding region and exporting except the liquid flow frame inner wall at the middle through-hole where water conservancy diversion region, strip is equipped between other liquid flow frame middle through-hole inner wall and porous electrode edge insulate porous filled layer；The porous filled layer of the insulation keeps apart porous electrode and liquid flow frame wall surface.
Description
Technical Field
The utility model relates to a flow battery field, in particular to flow battery or galvanic pile structure.
Background
The flow battery technology is a new electrochemical energy storage technology, and is widely concerned due to the advantages of independent design of energy storage capacity and power and the like. During the operation of the flow battery, active substances dissolved in the electrolyte circularly flow between the liquid storage tank and the battery (or the electric pile). When the electrolyte flows in the pile, the flow velocity near the wall surface is reduced under the influence of the viscosity action between the electrolyte and the wall surface, and the flow velocity is reduced as the flow velocity is closer to the wall surface until the flow velocity is reduced to 0 at the wall surface. The reduction of the flow velocity of the electrolyte can lead to the update and slow down of the active substances dissolved in the electrolyte, so that the concentration of the active substances is reduced, the concentration polarization is larger, the overall performance of the electric battery (or the electric pile) is reduced, the service life of the electric battery (or the electric pile) is shortened, the system cost is increased, and the large-scale application of the flow battery is not facilitated. To date, there is no effective solution to this problem.
SUMMERY OF THE UTILITY MODEL
Aiming at the problem of performance reduction caused by reduction of the flow velocity of electrolyte near the wall surface in the flow cell, a novel flow cell or an electric pile is provided, on the basis of the traditional assembly mode, an insulating porous filling layer is additionally arranged at the wall surface where an electrode frame and an electrode are attached to eliminate a low flow velocity area near the wall surface, so that the overall polarization of the cell is reduced, the utilization rate of the electrolyte is improved, and the system cost is finally reduced.
In order to achieve the above purpose, the utility model provides a specific technical scheme as follows:
a flow battery or galvanic pile comprises a sheet-shaped porous electrode and a flow frame with a through hole in the middle, the shape and the size of the through hole correspond to those of the sheet-shaped porous electrode, the porous electrode is arranged in the through hole in the middle of the flow frame, the peripheral edges of the porous electrode are attached to the inner wall surface of the through hole in the middle of the flow frame, the through hole as an electrolyte inflow channel and the through hole as an electrolyte outflow channel are arranged on the flow frame, the through hole of the electrolyte inflow channel is communicated with the through hole in the middle through a groove or a through hole as an inlet diversion area, and the through hole of the electrolyte outflow channel is communicated with the through hole in the middle through; the method is characterized in that: strip-shaped insulating porous filling layers are arranged between the inner wall surfaces of the middle through holes of other liquid flow frames and the peripheral edges of the porous electrodes except the inner wall surfaces of the liquid flow frames at the middle through holes where the inlet diversion area and the outlet diversion area are positioned; the insulating porous filler layer separates the porous electrode from the flow frame walls.
The utility model discloses assembly structure design standard does: the insulating porous filling layer is arranged between the porous electrode and the wall surface of the liquid flow frame.
Preferably, the width of the insulating porous filling layer is 0-30 mm; the length is greater than or equal to the length of the porous electrode along the flowing direction of the electrolyte; the difference between the thickness and the electrode thickness is 0-10 mm
Preferably, the difference between the porosity of the insulating porous filling layer and the porosity of the porous electrode after assembly is 0-0.3.
The utility model provides an insulating porous filling layer material can choose for use in polyurethane, polytetrafluoroethylene, polybenzimidazole, polyether sulfone material one or more than two, but not limited to this.
Compared with the prior art, adopt the utility model discloses a battery or pile can be rectangle and trapezoidal, can make the homogeneity of reactive species distribution obtain very big improvement to guarantee that battery and pile inside reaction are even unanimous, weaken the local heat release, reduce polarization, high 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 utility model discloses a battery or pile processing convenience, easy operation improves the distribution uniformity of the inside active material of redox flow battery and effectively promotes the battery performance through adding insulating porous filling layer. 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.
The porous insulating filling layer is additionally arranged at the joint of the liquid flow frame and the electrode, so that electrochemical reaction does not occur in the liquid thin layer with slower updating of the active substance, the concentration of the active substance at the edge of the electrode area is increased, the active substance is more uniformly distributed, the polarization of the battery is reduced, and the performance of the battery is improved.
Drawings
Fig. 1 is a schematic view of an assembly structure of embodiment 1.
Fig. 2 is a schematic view of an assembly structure of embodiment 2.
Fig. 3 is a schematic view of an assembly structure of comparative example 3.
Description of the symbols:
1-main electrolyte inlet, 2-inlet flow guide area, 3-wall surface, 4-insulating porous filling layer, 5-porous electrode, 6-outlet flow guide area, and 7-main electrolyte outlet
FIG. 4 is a graph of the concentration profile of the active substance in example 1 and comparative example 2 under the same operating conditions.
Detailed Description
Example 1
As shown in fig. 1, a flow battery assembly structure. The outer side of the area shown in the figure is a flow frame body, and the main area through which the electrolyte flows in the figure comprises an inlet guide area 2, an insulating porous filling layer 4, a porous electrode 5 and an outlet guide area 6. Wherein, an electrolyte main flow inlet 1 is arranged on the inlet diversion area, an electrolyte main flow outlet 7 is arranged on the outlet diversion area, and the insulating porous filling layer is arranged between the porous electrode 5 and the wall surface 3. The porous electrode is in a trapezoid shape, the upper bottom width of the porous electrode in the horizontal direction is 30mm, the lower bottom width of the porous electrode in the horizontal direction is 60mm, and the porous electrode is made of carbon felt; the left side and the right side of the porous electrode are respectively provided with an insulating porous filling layer in the shape of a parallelogram, the horizontal width of the insulating porous filling layer is 3mm, and the insulating porous filling layer is made of polyurethane. The horizontal widths of the inlet diversion area and the outlet diversion area are the sum of the horizontal widths of the porous electrode and the insulating porous filling layer, and are respectively 36mm at the inlet and 66mm at the outlet.
Example 2
As shown in fig. 2, a flow battery assembly structure. The outer side of the area shown in the figure is a flow frame body, and the main area through which the electrolyte flows in the figure comprises an inlet guide area 2, an insulating porous filling layer 4, a porous electrode 5 and an outlet guide area 6. Wherein, an electrolyte main flow inlet 1 is arranged on the inlet diversion area, an electrolyte main flow outlet 7 is arranged on the outlet diversion area, and the insulating porous filling layer is arranged between the porous electrode 5 and the wall surface 3. The porous electrode is a rectangle, the width of the porous electrode in the horizontal direction is 30mm, and the porous electrode is made of carbon felt; the left side and the right side of the porous electrode are respectively provided with a rectangular insulating porous filling layer, the horizontal width of the rectangular insulating porous filling layer is 3mm, and the rectangular insulating porous filling layer is made of polyurethane. The horizontal width of the inlet diversion area and the outlet diversion area is 36mm which is the sum of the horizontal widths of the porous electrode and the insulating porous filling layer.
Comparative example 3
Comparative example assembly structure a conventional rectangular flow battery assembly structure was selected, as shown in fig. 3. The outer side of the area shown in the figure is a flow frame body, and the main area through which the electrolyte flows in the figure comprises an inlet guide area 2, a porous electrode 5 and an outlet guide area 6. Wherein, an electrolyte main flow inlet 1 is arranged on the inlet diversion area, and an electrolyte main flow outlet 7 is arranged on the outlet diversion area. The porous electrode is a rectangle with a horizontal width of 30mm and is made of carbon felt. The width of the inlet guide area and the outlet guide area in the horizontal direction is 30 mm.
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*Respectively, the intrinsic viscosity and the effective viscosity of the electrolyte, and K represents the permeability of the porous medium (porous electrode) as determined 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 24000 Pa 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 1500mol m in this model-3. The relative error factor of model convergence is 1 × 10-6。
At 200mA cm-2The results of the simulation calculations for example 2 and comparative example 3 at a SoC of 50% are shown in fig. 4 and the following table:
it is thus clear that, adopt the utility model discloses an assembly structure is showing the homogeneity that improves the distribution of reaction active material, polarizes the reduction that also obtains showing, and then reduces the part and release heat, improves the electrolyte utilization ratio, reduce cost.
Claims (5)
1. A flow battery or galvanic pile comprises a sheet-shaped porous electrode and a flow frame with a through hole in the middle, the shape and the size of the through hole correspond to those of the sheet-shaped porous electrode, the porous electrode is arranged in the through hole in the middle of the flow frame, the peripheral edges of the porous electrode are attached to the inner wall surface of the through hole in the middle of the flow frame, the through hole as an electrolyte inflow channel and the through hole as an electrolyte outflow channel are arranged on the flow frame, the through hole of the electrolyte inflow channel is communicated with the through hole in the middle through a groove or a through hole as an inlet diversion area, and the through hole of the electrolyte outflow channel is communicated with the through hole in the middle through; the method is characterized in that: strip-shaped insulating porous filling layers are arranged between the inner wall surfaces of the middle through holes of other liquid flow frames and the peripheral edges of the porous electrodes except the inner wall surfaces of the liquid flow frames at the middle through holes where the inlet diversion area and the outlet diversion area are positioned; the insulating porous filler layer separates the porous electrode from the flow frame walls.
2. The flow battery or the electric pile according to claim 1, comprising a quadrangular sheet-shaped porous electrode and a flow frame with a corresponding quadrangular through hole in the middle, wherein the porous electrode is arranged in the middle through hole of the flow frame, and the peripheral edges of the porous electrode are attached to the inner wall surface of the middle through hole of the flow frame.
3. The flow battery or the galvanic pile according to claim 1, wherein the width of the insulating porous filling layer from inside to outside along the vertical flow frame is 0.1-30 mm; the difference between the thickness of the insulating porous filling layer perpendicular to the surface of the electrode and the thickness of the electrode during assembly is 0-10 mm.
4. The flow battery or stack of claim 1 or 3, wherein the difference between the porosity of the insulating porous filler layer and the porosity of the porous electrode after assembly is in the range of 0 to 0.3.
5. The flow battery or stack of claim 1, wherein the porous electrode comprises a positive electrode and a negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821611406.3U CN208674270U (en) | 2018-09-29 | 2018-09-29 | A kind of flow battery or pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821611406.3U CN208674270U (en) | 2018-09-29 | 2018-09-29 | A kind of flow battery or pile |
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| Publication Number | Publication Date |
|---|---|
| CN208674270U true CN208674270U (en) | 2019-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821611406.3U Active CN208674270U (en) | 2018-09-29 | 2018-09-29 | A kind of flow battery or pile |
Country Status (1)
| Country | Link |
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| CN (1) | CN208674270U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112447998A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Bipolar plate suitable for flow battery stack 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 |
-
2018
- 2018-09-29 CN CN201821611406.3U patent/CN208674270U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112447998A (en) * | 2019-08-28 | 2021-03-05 | 中国科学院大连化学物理研究所 | Bipolar plate suitable for flow battery stack 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 |
| CN112447998B (en) * | 2019-08-28 | 2024-03-26 | 中国科学院大连化学物理研究所 | Bipolar plate suitable for flow battery pile and application |
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