CN210576241U - Device for measuring concentration distribution of electrolyte of flow battery - Google Patents
Device for measuring concentration distribution of electrolyte of flow battery Download PDFInfo
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- CN210576241U CN210576241U CN201921996337.7U CN201921996337U CN210576241U CN 210576241 U CN210576241 U CN 210576241U CN 201921996337 U CN201921996337 U CN 201921996337U CN 210576241 U CN210576241 U CN 210576241U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
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Abstract
The utility model belongs to the technical field of the redox flow battery, a measure redox flow battery electrolyte concentration distribution's device is related to, is provided with redox flow battery the inside at least 2 sub batteries that imbed of redox flow battery. The device for measuring the electrolyte concentration distribution of the flow battery further comprises a negative end plate, a negative current collector plate frame, a negative electrode, a diaphragm, a positive electrode, a positive current collector plate frame and a positive end plate which are sequentially stacked; and the negative electrode subset fluid, the sub-negative electrode, the diaphragm, the sub-positive electrode and the positive electrode subset fluid are sequentially stacked to form the sub-battery. After these components are stacked in sequence, a measuring apparatus in which n (n ≧ 2) sub-batteries are mounted is formed by bolting. The device for measuring the electrolyte concentration distribution of the flow battery can obtain the distribution condition of the electrolyte concentration, is used for improving the distribution of a flow field and improving the performance of the battery.
Description
Technical Field
The utility model belongs to the technical field of the redox flow battery, especially, relate to a measure redox flow battery electrolyte concentration distribution's device.
Background
And the electrolyte of the all-vanadium flow battery is pumped into the galvanic pile from a storage tank through a liquid pump. The ampere-hour (Ah) capacity of the cell depends on the amount of active species in the electrolyte, and the power depends on the stack output voltage and current. The output voltage of the electric pile is determined by the serial connection number of the single batteries, and the output current of the electric pile is determined by the product of the area of the single batteries and the current density. Since the electrolyte is transported between the single cells through the main feeding pipe, the electrolyte in the single cell is transported from the inlet of the single cell to the outlet of the single cell through the branch. Therefore, the distribution of the electrolyte in the unit cell is uneven, and the larger the area, the longer the path of the electrolyte passing through the unit cell, and the more uneven the distribution of the electrolyte concentration, which may cause the local concentration of the electrolyte to be too high, which affects the life of the battery.
In order to improve the performance, safe operation and prolonged service life of the battery, it is necessary to study the distribution of the electrolyte in the unit battery. So far, many theoretical studies have been made on the concentration distribution of the electrolyte in the single cell, but experimental data are lacking.
The prior art CN200910248844 is a split end plate structure of a proton exchange membrane fuel cell for measuring current distribution, and the prior art CN201010148360 is a proton exchange membrane fuel cell structure for measuring oxygen concentration distribution, which is specific to the measurement of hydrogen ion concentration distribution by a fuel cell. At present, no scheme is available for measuring the concentration distribution of the vanadium redox battery.
During charging, the vanadium ions with valence 3 and 4 are converted into vanadium ions with valence 2 and 5 respectively. At this time, H + moves from the positive electrode to the negative electrode through the ion-conducting membrane, and free electrons e-The electrical neutrality is maintained by the movement of an external circuit from the positive pole to the negative pole, the reverse when discharging.
And (3) cathode reaction:
and (3) positive pole reaction:
and (3) total reaction:
the relationship between open circuit voltage and concentration can be derived from the Nernst equation:
in the formula EMCIs the open circuit voltage, V, of the subcell; ee 0The standard electrode potential in consideration of the influence of the hydrogen ion concentration on the electrode standard potential is obtained by neglecting the influence of the hydrogen ion concentration on the potential change, Ee 0＝E0+2RT/F·lnCHP(ii) a T is the temperature, K; r is 8.31 J.K-1·mol-1(ii) a F is the Faraday constant, C.mol-1；CjIs the concentration of j-valent vanadium ions, mol. L-1. For simplicity of explanation, it is assumed that the total vanadium ion concentration of the positive electrode and the negative electrode is equal, and that the positive electrode has only 5-valent vanadium ions and the negative electrode has only 2-valent vanadium ions when fully charged, and the concentration of the 2-valent vanadium ions is CmaxThen, equation (4) can be simplified to equation (5). This establishes a relationship between concentration and open circuit voltage.
In summary, the problems of the prior art are as follows:
(1) the existing device can not realize the measurement of the concentration distribution data of the electrolyte in the single battery.
(2) The prior art cannot realize the measurement of the concentration of the vanadium battery.
Disclosure of Invention
Problem to prior art existence, the utility model provides a measure redox flow battery electrolyte concentration distribution's device.
The utility model discloses a realize like this: the method is characterized in that n sub-batteries are embedded in the flow battery, n is larger than or equal to 2, the sub-batteries do not participate in reaction in the charging and/or discharging process of the flow battery, and the sub-batteries are used for measuring the open-circuit voltage of each sub-battery to represent the concentration distribution of vanadium ions. The device for measuring the electrolyte concentration distribution of the flow battery can obtain the distribution condition of the electrolyte concentration, is used for improving the distribution of a flow field and improving the performance of the battery.
Measure redox flow battery electrolyte concentration distribution's device, including negative pole end plate, the mass flow current body sheet frame of negative pole, diaphragm, anodal, the mass flow current body sheet frame of positive pole, the anodal end plate that piles up in proper order and form, its characterized in that: the negative end plate is provided with n holes, n independent subset fluids insulated with the negative current collector plate frame are separated from the negative current collector plate frame at positions corresponding to the n holes, n independent sub-cathodes insulated with the negative electrode are separated from the negative electrode at positions corresponding to the n sub-current collectors, and n is not less than 2; n independent sub-anodes insulated from the anode are separated from the positions, corresponding to the sub-cathodes, on the anode, n independent sub-fluids insulated from an anode current collector plate frame are separated from the positions, corresponding to the sub-anodes, on the anode current collector end plate, n holes are formed in the positions, corresponding to the sub-anode current collectors, on the anode end plate, and n is not less than 2; and the negative electrode subset fluid, the sub-negative electrode, the diaphragm, the sub-positive electrode and the positive electrode subset fluid are sequentially stacked to form the sub-battery.
Furthermore, a lead penetrates through n holes in the negative end plate to be connected with a negative electrode current collector, and the lead and the negative end plate are insulated and sealed by insulating glue.
And further, insulating and sealing the subset fluid on the negative current collector plate frame and the negative current collector plate frame by using insulating glue.
Furthermore, the sub-negative electrode on the negative electrode is insulated from the negative electrode by an insulating material.
Furthermore, the sub-positive electrode on the positive electrode is insulated from the positive electrode by an insulating material.
And further, insulating glue is used for insulating and sealing the subset fluid on the positive current collector plate frame and the positive current collector plate frame.
Furthermore, a lead penetrates through n holes in the positive end plate to be connected with a positive electrode current collector, and the lead and the positive end plate are insulated and sealed by insulating glue.
Further, the areas of the sub-negative electrode and the sub-positive electrode in the sub-battery are as small as one thousandth to one fiftieth of the area of the battery, and the maximum area of the sub-negative electrode and the area of the sub-positive electrode does not exceed one tenth of the area of the battery.
Further, the number n of the sub-cells is preferably more than 4, and is uniformly distributed in the battery.
Further, the sub-batteries do not participate in reaction when the main battery is in charge or discharge operation, and the open-circuit voltage of the sub-batteries is measured to represent the concentration distribution of vanadium ions.
In summary, the advantages and positive effects of the invention are: the device for measuring the electrolyte concentration distribution of the flow battery can obtain the distribution condition of the electrolyte concentration, is used for improving the distribution of a flow field and improving the performance of the battery.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode end plate according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a negative current collector plate frame provided by the embodiment of the utility model.
Fig. 3 is a schematic structural diagram of a negative electrode provided in an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a diaphragm provided in an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a positive electrode according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a positive current collector plate frame provided by an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a positive electrode end plate according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a device for measuring electrolyte concentration distribution of a flow cell according to an embodiment of the present invention.
In the figure: 1. a negative terminal plate; 2. insulating glue; 3. a wire; 4. a negative current collector plate frame; 5. a positive current collector plate frame; 6. a subset fluid; 7. a negative electrode; 8. an insulating material; 9. a sub-negative electrode; 10. a positive electrode; 11. a positive electrode terminal plate; 12. and a sub-anode.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
In view of the problems in the prior art, the present invention provides a device for measuring the electrolyte concentration distribution of a flow cell, and the following describes the present invention in detail with reference to fig. 1 to 8.
The method is characterized in that n sub-batteries are embedded in the flow battery, n is larger than or equal to 2, the sub-batteries do not participate in reaction in the charging and/or discharging process of the flow battery, and the sub-batteries are used for measuring the open-circuit voltage of each sub-battery to represent the concentration distribution of vanadium ions. The device for measuring the electrolyte concentration distribution of the flow battery can obtain the distribution condition of the electrolyte concentration, is used for improving the distribution of a flow field and improving the performance of the battery.
The device for measuring the concentration distribution of the electrolyte of the flow battery comprises a negative end plate 1, a negative current collector plate frame 4, a negative electrode 7, a diaphragm, a positive electrode, a positive current collector plate frame 5 and a positive end plate 11 which are sequentially stacked, wherein n holes are formed in the negative end plate 1, n independent sub-fluids 6 insulated from the negative current collector plate frame 4 are separated from positions corresponding to the n holes on the negative current collector plate frame 4, n independent sub-negative electrodes 9 insulated from the negative electrode are separated from positions corresponding to the n sub-current collectors 6 on the negative electrode 7, and n is not less than 2; n independent sub-anodes 12 insulated from the anode are separated from the positions, corresponding to the sub-cathodes 9, on the anode current collector end plate, n independent sub-fluids 6 insulated from the anode current collector plate frame 5 are separated from the positions, corresponding to the sub-anodes 12, on the anode current collector end plate 11, n holes are formed in the positions, corresponding to the sub-anode current collector 12, on the anode current collector end plate 11, and n is not less than 2; the cathode subfluidizing fluid 6, the sub-cathode 9, the separator, the sub-anode 12 and the anode subfluidizing fluid 6 are stacked in sequence to form the sub-battery.
The lead 3 passes through n holes on the negative terminal plate 1 to be connected with the negative subset fluid 6, and the lead 3 and the negative terminal plate 1 are insulated and sealed by the insulating glue 2. And insulating and sealing the subset fluid 6 on the negative current collector plate frame 4 and the negative current collector plate frame 4 by using insulating glue 2. And the sub-negative electrode 9 on the negative electrode is insulated from the negative electrode 7 by an insulating material 8. And the sub-positive electrode 12 on the positive electrode is insulated from the positive electrode by an insulating material 8. And insulating and sealing the sub-fluid 6 on the positive current collector plate frame and the positive current collector plate frame 5 by using insulating glue 2. The lead 3 is connected with the positive electrode subset fluid 6 through n holes on the positive electrode end plate 11, and the lead 3 and the positive electrode end plate 11 are insulated and sealed by the insulating glue 2. The areas of the sub-negative electrode 9 and the sub-positive electrode 12 in the sub-battery are as small as one thousandth to one fiftieth of the area of the battery, and the maximum area of the sub-negative electrode is not more than one tenth of the area of the battery. The number n of said sub-cells is preferably greater than 4 and is uniformly distributed in said cell. The sub-batteries do not participate in reaction when the main battery is charged or discharged, and the open-circuit voltage of the sub-batteries is measured to represent the concentration distribution of vanadium ions.
The device for measuring the electrolyte concentration distribution of the flow battery can measure the electrolyte concentration distribution in the flow battery stack. The method for measuring the concentration distribution in the single battery comprises the following steps: in the single battery, a plurality of independent batteries are arranged in the single battery for measuring open-circuit voltage, and the distribution of the concentration of the electrolyte is obtained through the Nernst equation.
F1. Negative electrode 7: the negative electrode 7 (carbon felt) was divided into 9 parts of 120mm × 150mm, a carbon felt of 10mm in diameter was dug out at the center of the 9 parts for use, then, a 15mm circular ring was dug out in the same manner, an insulating ring was embedded at this position and then a 10mm carbon felt was put in. The other 8 parts are processed in the same way, as in fig. 3.
F2. Negative current collector plate frame 4: the part of the negative current collector plate frame 4 contacting with the negative carbon felt is divided into 9 parts, the same treatment as the carbon felt is carried out on the 9 parts, namely, holes of 10mm and 15mm are dug in the center of each part, and after the bipolar plate of 10mm is placed, the bipolar plate is sealed by insulating glue 2, as shown in figure 2.
F3. Negative electrode terminal plate 1: and (3) opening 9 holes, connecting the wires 3, and sticking the peripheries of the wires 3 by using insulating glue 2, as shown in figure 1.
F4. A diaphragm: as shown in fig. 4.
F5. And (3) positive electrode: refer to F1 for negative electrode 7, fig. 5.
F6. Positive current collector plate frame 5: reference is made to F2 negative current collector plate frame 4, fig. 6.
F7. Positive electrode terminal plate 11: refer to F3 negative terminal plate 1, fig. 7.
As shown in fig. 8, an F3 negative electrode end plate 1, an F2 negative electrode current collector plate frame 4, an F1 negative electrode 7, an F4 diaphragm, an F5 positive electrode, an F6 positive electrode current collector plate frame 5 and an F7 positive electrode end plate 11 are sequentially stacked and locked by bolts to form a measuring device for measuring the concentration distribution of the electrolyte, and 9 sub-batteries are embedded in a main battery. Measuring the open circuit voltage of each sub-cell by using the relation (5) between the open circuit voltage and the electrolyte concentration
And calculating to obtain the concentration distribution.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.
Claims (10)
1. A device for measuring the electrolyte concentration distribution of a flow battery is characterized in that the device for measuring the electrolyte concentration distribution of the flow battery is provided with the flow battery, and at least 2 sub-batteries are embedded in the flow battery;
the negative end plate, the negative current collector plate frame, the negative electrode, the diaphragm, the positive electrode, the positive current collector plate frame and the positive end plate are sequentially stacked and mounted; and the negative electrode subset fluid, the sub-negative electrode, the diaphragm, the sub-positive electrode and the positive electrode subset fluid are sequentially stacked to form the sub-battery.
2. The apparatus for measuring electrolyte concentration distribution of a flow battery of claim 1, wherein the negative end plate has n holes, and n independent sub-fluids insulated from the negative current collector plate frame are separated from the negative current collector plate frame at positions corresponding to the n holes;
n independent sub-cathodes insulated from the cathode are separated from the positions, corresponding to the n sub-current collectors, on the cathode, wherein n is not less than 2;
n independent sub-anodes insulated from the anode are divided at the positions on the anode and corresponding to the sub-cathodes, and n independent sub-fluids insulated from the anode current collector plate frame are divided at the positions on the anode current collector end plate and corresponding to the sub-anodes;
and n holes are formed in the positions, corresponding to the sub-anode current collectors, on the anode end plate, and n is not less than 2.
3. The apparatus of claim 2, wherein the lead is connected to the negative electrode current collector through n holes on the negative electrode end plate, and the lead is insulated and sealed from the negative electrode end plate by an insulating adhesive.
4. The apparatus for measuring electrolyte concentration distribution of a flow battery according to claim 1, wherein the subset fluid on the negative current collector plate frame is insulated and sealed from the negative current collector plate frame by an insulating glue.
5. The apparatus of claim 2, wherein the sub-cathodes on the cathode are insulated from the cathode by an insulating material.
6. The apparatus of claim 2, wherein the sub-positive electrode on the positive electrode is insulated from the positive electrode by an insulating material.
7. The apparatus for measuring electrolyte concentration distribution of a flow battery according to claim 1, wherein the sub-set fluid on the positive electrode current collector plate frame is insulated and sealed with the positive electrode current collector plate frame by using an insulating glue.
8. The apparatus of claim 2, wherein the lead is connected to the positive electrode sub-collector through n holes on the positive electrode end plate, and the lead is insulated and sealed from the positive electrode end plate by an insulating adhesive.
9. The device for measuring the electrolyte concentration distribution of the flow battery according to claim 2, wherein the areas of the sub-negative electrode and the sub-positive electrode in the sub-battery are as small as one thousandth to one fiftieth of the area of the battery.
10. The apparatus for measuring electrolyte concentration distribution of a flow battery as recited in claim 2, wherein the number n of sub-cells is greater than 2 and is evenly distributed in the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921996337.7U CN210576241U (en) | 2019-11-19 | 2019-11-19 | Device for measuring concentration distribution of electrolyte of flow battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921996337.7U CN210576241U (en) | 2019-11-19 | 2019-11-19 | Device for measuring concentration distribution of electrolyte of flow battery |
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| CN210576241U true CN210576241U (en) | 2020-05-19 |
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