CN216698452U - Electrode frame for zinc-bromine double-flow battery and zinc-bromine double-flow battery - Google Patents
Electrode frame for zinc-bromine double-flow battery and zinc-bromine double-flow battery Download PDFInfo
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- CN216698452U CN216698452U CN202122869685.1U CN202122869685U CN216698452U CN 216698452 U CN216698452 U CN 216698452U CN 202122869685 U CN202122869685 U CN 202122869685U CN 216698452 U CN216698452 U CN 216698452U
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Abstract
The utility model discloses a high-power-density zinc-bromine double-flow battery, which belongs to the technical field of flow battery energy storage, and is a battery pack formed by connecting one or more than two single batteries in series, wherein each single battery mainly comprises a negative electrode frame, a negative carbon felt electrode and a diaphragm which are sequentially stacked, the negative carbon felt electrode and the diaphragm are arranged in a through hole in the middle of the negative electrode frame, and a positive carbon felt electrode and a positive electrode frame are arranged in a through hole in the middle of the positive electrode frame; the positive electrode frame or the negative electrode frame comprises the electrode plate and the flow channel cover plate, and the problems of strength reduction and battery reliability reduction caused by the thickness reduction of the electrode frame are solved by reducing the thickness of the electrode frame and arranging the electrolyte inlet and outlet distribution flow channels on the flow channel cover plate; by reducing the distance between the anode and the cathode, the polarization of the battery is reduced, the performance of the battery is improved, the size of the battery is correspondingly reduced, and the power density of the battery is further improved.
Description
Technical Field
The utility model belongs to the technical field of flow battery energy storage, and particularly relates to an electrode frame for a zinc-bromine double-flow battery and the zinc-bromine double-flow battery.
Background
The zinc-bromine flow battery is a novel flow battery energy storage technology with low cost, high stability and long service life, and has higher energy density, however, because the negative electrode of the zinc-bromine flow battery is a zinc deposition and dissolution process, the working current density of the zinc-bromine flow battery is not too high, and therefore, the problem of how to improve the power density of the zinc-bromine flow battery is urgently needed to be solved. The cathode of the zinc-bromine flow battery is the deposition and dissolution of zinc, the anode is the conversion of bromide ions and bromine simple substances, and the reaction kinetics control step of the electrochemical reaction is in the anode, so how to improve the reaction kinetics of the anode is the key for improving the zinc-bromine flow battery. Unlike the zinc-bromine single flow battery, the positive electrode and the negative electrode of the zinc-bromine double flow battery flow simultaneously, so the capacity of the positive electrode is not limited in the battery, and relevant research for improving the power density and performance of the battery by adjusting the thickness of the positive electrode frame has not been reported.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an electrode frame for a zinc-bromine double flow battery and a zinc-bromine double flow battery.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an electrode frame for a zinc-bromine double-flow battery comprises an electrode plate and a flow channel cover plate, wherein the electrode plate is a rectangular flat plate with a through hole in the middle, and an electrolyte inlet flow channel, an electrolyte inlet flow guide channel, an electrolyte outlet flow guide channel and an electrolyte outlet flow guide channel are respectively arranged on two opposite sides of the through hole on the surface A on one side of the electrode plate; the flow channel cover plate is a flat plate tightly attached to the electrolyte inlet flow guide channel or the electrolyte outlet flow guide channel, and an electrolyte inlet distribution channel communicated with the electrolyte inlet flow guide channel and the middle through hole and an electrolyte outlet distribution channel communicated with the electrolyte outlet flow guide channel and the middle through hole are arranged on the attachment surface of the flow channel cover plate; the electrode plate and the flow passage cover plate are oppositely buckled to form an integrated electrode frame.
Furthermore, the thickness of the electrode plate is between 2 and 3mm, and the depth of the inlet and outlet guide flow channels is 50 to 80 percent of the thickness of the electrode plate.
Furthermore, the width of the distribution flow channel on the flow channel cover plate is 0.5-1mm, and the depth of the distribution flow channel is the same as the depth of the upper outlet guide flow channel and the lower outlet guide flow channel of the electrode plate.
The utility model also provides a zinc-bromine double-flow battery assembled by using the electrode frame, wherein the electrode frame is used as a positive electrode frame for the zinc-bromine double-flow battery, or the electrode frame is used as a positive electrode frame and a negative electrode frame at the same time; the zinc-bromine double-flow battery is a battery pack formed by connecting one single battery or more than two single batteries in series, and the single batteries mainly comprise a negative electrode frame, a negative carbon felt electrode, a diaphragm and a positive electrode frame which are sequentially stacked, wherein the negative carbon felt electrode is arranged in a through hole in the middle of the negative electrode frame, and the positive carbon felt electrode is arranged in a through hole in the middle of the positive electrode frame.
Furthermore, the negative electrode frame is a rectangular flat plate with a through hole in the middle, welding platforms are arranged around the through hole, a negative electrolyte inlet channel and a negative electrolyte outlet channel are respectively arranged on two opposite sides (namely the upper side and the lower side of the surface B) of the through hole on the surface B on one side of the flat plate, and a negative electrolyte inlet distribution channel communicated with the negative electrolyte inlet channel and the through hole in the middle, a negative electrolyte outlet distribution channel communicated with the negative electrolyte outlet channel and the through hole in the middle are respectively arranged on the two opposite sides of the through hole on the surface B on the other side of the flat plate; and a negative electrode flow channel cover plate is arranged on the negative electrode electrolyte inlet distribution flow channel and the negative electrode electrolyte outlet distribution flow channel, and is a smooth flat plate.
Further, a cavity is arranged between the negative carbon felt electrode and the negative electrolyte inlet distribution channel and between the negative carbon felt electrode and the negative electrolyte outlet distribution channel.
Furthermore, no cavity is arranged between the anode carbon felt electrode and the anode electrolyte inlet distribution flow channel and between the anode carbon felt electrode and the anode electrolyte outlet distribution flow channel.
Furthermore, the electrolyte inlet channels are connected among the cathode electrode frames through the cathode electrolyte inlet common channels, and the electrolyte outlet channels are connected among the cathode electrode frames through the cathode electrolyte outlet common channels.
Furthermore, electrolyte inlet channels are connected among the sections of the positive electrode frames through positive electrolyte inlet common channels, and electrolyte outlet channels are connected among the sections of the positive electrode frames through positive electrolyte outlet common channels.
Further, the thickness of the negative electrode frame is between 4mm and 6 mm.
Furthermore, the width of the distribution flow channel on the negative electrode frame is 1-2mm, and the depth is 50-80% of the thickness of the negative electrode frame.
Further, the thickness of the positive electrode frame is smaller than that of the negative electrode frame.
Furthermore, the width of the distribution flow channel on the negative electrode frame is greater than or equal to that on the positive electrode flow channel cover plate.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the thickness of the positive electrode frame is reduced, and the distribution flow channel of the positive electrolyte inlet and outlet is arranged on the flow channel cover plate, so that the problems of reduced strength and reduced battery reliability caused by the reduced thickness of the positive electrode frame are solved; through attenuate anodal electrode frame thickness, reduce anodal interval to reduce battery polarization, promote the battery performance, in addition, behind the attenuate anodal thickness, the volume of battery also correspondingly reduces, and its power density can further promote.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings to which the embodiments relate will be briefly described below.
Fig. 1 is a structure of an electrode frame of the present invention as a positive electrode frame, in which 1: positive electrolyte inlet/outlet flow passage, 2: positive electrolyte inlet/outlet flow guide channel, 3: positive electrode runner cover plate, 4: the positive electrolyte inlet/outlet distributes the runner.
Fig. 2 is a frame structure of positive and negative electrodes of a comparative example, in which 1: positive and negative electrolyte inlet/outlet flow passages, 2: positive and negative electrolyte inlet/outlet distribution flow channels, 3: and positive and negative electrode runner cover plates.
Fig. 3 is a charge and discharge performance curve of the comparative example.
Fig. 4 is a charge and discharge performance curve of example 1.
Fig. 5 is a charge and discharge performance curve of example 2.
Fig. 6 is a charge and discharge performance curve of example 3.
Detailed Description
The present invention is described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto, and it is obvious that the examples in the following description are only some examples of the present invention, and it is obvious for those skilled in the art to obtain other similar examples without inventive labor and falling into the scope of the present invention.
Comparative example
The comparative example adopts the electrode frame structure shown in fig. 2 to assemble a zinc-bromine double-flow battery pack, 10 monocells are arranged between two current collecting plates, each monocell comprises a negative electrode frame, a negative carbon felt electrode and a diaphragm, which are sequentially stacked, the negative carbon felt electrode is arranged in a through hole in the middle of the negative electrode frame, the positive carbon felt electrode is arranged in a through hole in the middle of the positive electrode frame, and the negative electrode frame and the positive electrode frame both adopt the electrode frame structures shown in fig. 2; each section of negative electrode frame is connected with the electrolyte inlet flow channel through the negative electrolyte inlet common flow channel, and each section of negative electrode frame is connected with the electrolyte outlet flow channel through the negative electrolyte outlet common flow channel; the electrolyte inlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte inlet common flow channel, and the electrolyte outlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte outlet common flow channel. The thickness of the negative electrode frame is 4mm, the depth of an upper outlet flow channel and a lower outlet flow channel of the negative electrode frame is 60% of the thickness of the electrode frame, and the width of the flow channel is 2 mm; the thickness of the positive electrode frame is 4mm, the depth of an upper inlet runner and an outlet runner of the positive electrode frame is 60% of the thickness of the electrode frame, and the width of the runners is 2 mm; and a diaphragm is arranged between the positive electrode frame and the negative electrode frame, and two sides of the monocell are respectively provided with a bipolar plate. The electrolyte adopts 2mol/l zinc bromide solution, 3mol/l potassium chloride solution and 0.8mol/l MEP complexing agent. The specific electrode size, the number of the electrode stacks and the charging and discharging system are as follows:
electrode area: 800cm2。
The number of the electric pile sections: 10 section
Current density: 40mA/cm2And charging time: 1 hour, discharge cut-off voltage: 8V
The coulomb efficiency of the galvanic pile is 86.3%, the voltage efficiency is 79.4%, and the energy efficiency is 68.5%.
Example 1
The zinc-bromine double flow battery pack of example 1 is formed by arranging 10 single cells between two current collecting plates, wherein each single cell comprises a negative electrode frame, a negative carbon felt electrode and a diaphragm which are sequentially stacked, the negative carbon felt electrode and the diaphragm are arranged in a through hole in the middle of the negative electrode frame, and a positive carbon felt electrode and a positive electrode frame are arranged in a through hole in the middle of the positive electrode frame; the negative electrode frame adopts an electrode frame structure shown in FIG. 2, and the positive electrode frame adopts an electrode frame structure shown in FIG. 1; the electrolyte inlet flow channel is connected between each two sections of the cathode electrode frames through the cathode electrolyte inlet common flow channel, and the electrolyte outlet flow channel is connected between each two sections of the cathode electrode frames through the cathode electrolyte outlet common flow channel; the electrolyte inlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte inlet common flow channel, and the electrolyte outlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte outlet common flow channel. The thickness of the negative electrode frame is 4mm, the depth of an upper outlet flow channel and a lower outlet flow channel of the negative electrode frame is 60% of the thickness of the electrode frame, and the width of the flow channel is 2 mm; the thickness of the positive electrode frame is 3mm, the depth of the flow channels for guiding the flow at the upper outlet and the outlet of the positive electrode plate is 60% of the thickness of the electrode frame, and the width of the flow channel is 1 mm; and a diaphragm is arranged between the positive electrode frame and the negative electrode frame, and two sides of the monocell are respectively provided with a bipolar plate. The electrolyte adopts 2mol/l zinc bromide solution, 3mol/l potassium chloride solution and 0.8mol/l MEP complexing agent. The specific electrode size, the number of the electrode stacks and the charging and discharging system are as follows:
electrode area: 800cm2；
The number of the electric pile sections: 10 sections;
current density: 40mA/cm2And charging time: 1 hour, discharge cut-off voltage: 8V, and (2);
the coulomb efficiency of the galvanic pile is 92.8%, the voltage efficiency is 83.2%, and the energy efficiency is 77.2%.
Example 2
The zinc-bromine liquid double-flow battery pack of embodiment 2 is formed by arranging 10 single cells between two current collecting plates, wherein each single cell comprises a negative electrode frame, a negative carbon felt electrode and a diaphragm which are sequentially stacked, the negative carbon felt electrode is arranged in a through hole in the middle of the negative electrode frame, the positive carbon felt electrode is arranged in a through hole in the middle of the positive electrode frame, and the positive electrode frame is of an electrode frame structure shown in fig. 2; each section of negative electrode frame is connected with the electrolyte inlet flow channel through the negative electrolyte inlet common flow channel, and each section of negative electrode frame is connected with the electrolyte outlet flow channel through the negative electrolyte outlet common flow channel; the electrolyte inlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte inlet common flow channel, and the electrolyte outlet flow channel is connected between each section of the positive electrode frame through the positive electrolyte outlet common flow channel. The thickness of the negative electrode frame is 4mm, the depth of an upper outlet flow channel and a lower outlet flow channel of the negative electrode frame is 60% of the thickness of the electrode frame, and the width of the flow channel is 2 mm; the thickness of the positive electrode frame is 2mm, the depth of the flow channels of the upper inlet and the outlet of the electrode plate is 60% of the thickness of the electrode frame, and the width of the flow channel is 1 mm; and a diaphragm is arranged between the positive electrode frame and the negative electrode frame, and two sides of the monocell are respectively provided with a bipolar plate. The electrolyte adopts 2mol/l zinc bromide solution, 3mol/l potassium chloride solution and 0.8mol/l MEP complexing agent. The specific electrode size, the number of the electrode stacks and the charging and discharging system are as follows:
electrode area: 800cm2；
The number of the electric pile sections: 10 sections;
current density: 40mA/cm2And charging time: 1 hour, discharge cut-off voltage: 8V, and (2);
the coulomb efficiency of the galvanic pile is 94.3%, the voltage efficiency is 85.2%, and the energy efficiency is 80.3%.
Example 3
electrode area: 800cm2；
The number of the electric pile sections: 10 sections;
current density: 40mA/cm2And charging time: 1 hour, discharge cut-off voltage: 8V, and (2);
the coulomb efficiency of the galvanic pile is 94.8%, the voltage efficiency is 87.4%, and the energy efficiency is 82.8%.
The charge and discharge performance curve of the battery pack of the comparative example is shown in fig. 3, and it can be seen that the battery pack of the comparative example is low in both efficiency and cycle life.
The charge and discharge performance curve of the battery pack in example 1 is shown in fig. 4, it can be seen that the coulombic efficiency of the battery pack in example 1 is slightly improved, 92.8%, and the energy efficiency is 77.2%, and the voltage efficiency of the battery pack is improved compared with that of the comparative example, mainly because the ohmic resistance of the battery is reduced, the polarization is reduced, the voltage efficiency and the coulombic efficiency are correspondingly improved, the number of battery cycles is also greatly improved, and the reliability is enhanced.
As shown in fig. 5, the charge/discharge performance curve of the battery pack of example 2 shows that the coulombic efficiency of the battery pack is 94.3%, which is greatly improved as compared with the comparative example and example 1, and the energy efficiency of the battery pack is 80.3%, which is further reduced as compared with example 1, and therefore, the ohmic resistance is further reduced, the polarization is further reduced, and the battery performance is further improved.
The charge and discharge performance curve of the battery pack in example 3 is shown in fig. 6, and it can be seen that the coulombic efficiency of the battery pack is 94.8%, which is slightly higher than that of example 2, and the voltage efficiency is 87.4%, which is obviously improved compared with that of example 2. The positive electrode frame and the negative electrode frame of the embodiment adopt the electrode frame structure provided by the utility model, so that the positive electrode and the negative electrode are thinned simultaneously, the electrode distance is further reduced, the ohmic polarization is further reduced, and the performance of the battery is further improved.
In summary, after the electrode frame structure provided by the utility model is adopted, the electrode frame thickness is reduced, the inter-electrode distance is reduced, the ohmic resistance is reduced, and the polarization is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An electrode frame for a zinc-bromine double-flow battery is characterized in that the electrode frame comprises an electrode plate and a flow channel cover plate, the electrode plate is a rectangular flat plate with a through hole in the middle, and an electrolyte inlet flow channel, an electrolyte inlet flow guide flow channel, an electrolyte outlet flow channel and an electrolyte outlet flow guide flow channel are respectively arranged on two opposite sides of the through hole on the surface A on one side of the electrode plate; the flow channel cover plate is a flat plate tightly attached to the electrolyte inlet flow guide channel or the electrolyte outlet flow guide channel, and an electrolyte inlet distribution channel communicated with the electrolyte inlet flow guide channel and the middle through hole and an electrolyte outlet distribution channel communicated with the electrolyte outlet flow guide channel and the middle through hole are arranged on the attachment surface of the flow channel cover plate; the electrode plate and the flow passage cover plate are oppositely buckled to form an integrated electrode frame.
2. The electrode frame of claim 1, wherein the thickness of the electrode plate is between 2 and 3mm, and the depth of the inlet and outlet flow guide channels is 50 to 80 percent of the thickness of the electrode plate.
3. The electrode frame of claim 1 or 2, wherein the distribution channels of the channel cover plate have a width of 0.5-1mm and a depth equal to the depth of the inlet and outlet guide channels of the electrode plate.
4. A zinc-bromine double flow battery assembled by using the electrode frame according to any one of claims 1 to 3, wherein the electrode frame is used as a positive electrode frame for the zinc-bromine double flow battery, or used as a positive electrode frame and a negative electrode frame at the same time; the zinc-bromine double-flow battery is a battery pack formed by connecting one single battery or more than two single batteries in series, and the single batteries mainly comprise a negative electrode frame, a negative electrode, a diaphragm and a positive electrode frame which are sequentially stacked, wherein the negative electrode, the diaphragm and the positive electrode are arranged in a through hole in the middle of the negative electrode frame, and the positive electrode is arranged in a through hole in the middle of the positive electrode frame.
5. The zinc-bromine double flow battery as claimed in claim 4, wherein the negative electrode frame is a rectangular plate having a through hole in the middle, and a negative electrolyte inlet channel and a negative electrolyte outlet channel are provided on one side surface B of the plate on the opposite sides of the through hole, respectively, and a negative electrolyte inlet distribution channel communicating the negative electrolyte inlet channel with the middle through hole, a negative electrolyte outlet distribution channel communicating the negative electrolyte outlet channel with the middle through hole; and a negative electrode flow channel cover plate is arranged on the negative electrode electrolyte inlet distribution flow channel and the negative electrode electrolyte outlet distribution flow channel, and is a smooth flat plate.
6. The zinc-bromine dual flow battery of claim 4, wherein each segment of negative electrode frames is connected to the negative electrolyte inlet channel by a negative electrolyte inlet common channel, and each segment of negative electrode frames is connected to the negative electrolyte outlet channel by a negative electrolyte outlet common channel.
7. A zinc-bromine double flow battery as claimed in claim 4 wherein each segment of positive electrode frame is connected to the positive electrolyte inlet channel by a positive electrolyte inlet common channel and each segment of positive electrode frame is connected to the positive electrolyte outlet channel by a positive electrolyte outlet common channel.
8. The zinc-bromine dual flow battery of claim 5, wherein the thickness of the positive electrode frame is less than the thickness of the negative electrode frame.
9. The zinc-bromine double flow battery of claim 5, wherein the width of the distribution flow channel on the negative electrode frame is greater than or equal to the width of the distribution flow channel on the positive electrode flow channel cover plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116014200A (en) * | 2022-12-09 | 2023-04-25 | 大连海事大学 | Positive and negative electrode frame integrated flow field structure of high-power density flow battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116014200A (en) * | 2022-12-09 | 2023-04-25 | 大连海事大学 | Positive and negative electrode frame integrated flow field structure of high-power density flow battery |
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