CN214099654U - Assembly of electrode frame and diaphragm of flow battery - Google Patents

Assembly of electrode frame and diaphragm of flow battery Download PDF

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CN214099654U
CN214099654U CN202022607224.2U CN202022607224U CN214099654U CN 214099654 U CN214099654 U CN 214099654U CN 202022607224 U CN202022607224 U CN 202022607224U CN 214099654 U CN214099654 U CN 214099654U
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electrode frame
diaphragm
annular
thickness
electrode
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史丁秦
李先锋
张华民
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Dalian Institute of Chemical Physics of CAS
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Dalian Institute of Chemical Physics of CAS
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Abstract

An assembly of an electrode frame and a membrane of a flow battery, in particular to the application thereof in the field of flow batteries. The diaphragm is arranged in the through hole in the middle of the electrode frame, and the peripheral edge of the diaphragm is abutted against the annular platform or is arranged in the annular groove in the electrode frame. The utility model realizes the technology that the positive electrode and the negative electrode are the same electrode frame in the flow battery; in the assembly process of the flow battery, the use of sealing materials is reduced, the assembly process of the flow battery is optimized, and the cost of the flow battery is reduced; the use of the sealing gasket is reduced, the thickness of the battery is reduced, the volume of the battery is reduced, and the volumetric specific energy is improved; the sealing links in the assembly process of the flow battery are reduced, and the reliability of the galvanic pile is greatly improved.

Description

Assembly of electrode frame and diaphragm of flow battery
Technical Field
The utility model relates to an electrode frame and diaphragm technique for the redox flow battery relate to very much and in the redox flow battery field.
Background
With the increasing demand for the use of renewable clean energy, the utilization of renewable energy such as wind energy and solar energy has received more attention. However, the power generation of renewable energy sources such as wind energy, solar energy and the like is influenced by conditions such as seasons, weather, regions and the like, and has obvious discontinuity and instability. The power fluctuation generated by the power transmission system is large, and the adjustability is poor. Direct use will likely cause a large impact on the grid. And the energy storage technology can effectively solve the problem. Therefore, energy storage technology has also become the focus of much attention. The large-scale energy storage technology is considered as a strategic technology supporting the popularization of renewable energy, and is highly concerned by governments and business industries of various countries.
Energy storage techniques include two broad categories, physical and chemical. The physical energy storage comprises water pumping energy storage, compressed air energy storage, flywheel energy storage and the like. The chemical energy storage mainly comprises a lead-acid battery, a sodium-sulfur battery, a flow battery, a lithium ion battery and the like. However, various energy storage technologies have suitable application fields, and chemical energy storage technologies suitable for large-scale energy storage mainly comprise flow batteries, sodium-sulfur batteries, lead-acid batteries and lithium ion batteries. The advantages and the disadvantages of various energy storage technologies are comprehensively considered, and the energy storage technology of the flow battery is more widely concerned.
In the flow battery, the electrode frame is the place for placing the electrode and arranging the flow channel, and the electrode frame is required to have enough strength and better acid-base corrosion resistance. In a conventional flow battery, each single segment includes a positive electrode frame and a negative electrode frame, which respectively store a positive electrode and a negative electrode. And a diaphragm is arranged between the positive electrode and the negative electrode, and sealing technology is adopted when the positive electrode and the negative electrode are respectively contacted with the diaphragm so as to ensure that the battery has no leakage phenomenon. However, in the actual process, the leakage of the battery often exists, so that the problem of the leakage of the battery can be directly and effectively solved only by reducing links needing sealing.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem above, the utility model provides a subassembly of flow battery electrode frame and diaphragm, a serial communication port, including the cyclic annular electrode frame of a middle part band-pass hole, be equipped with cyclic annular boss or annular groove on the inner wall face at electrode frame through-hole middle part, the diaphragm is placed in the through-hole at electrode frame middle part, and the edge all around of diaphragm is arranged in the inside annular groove of electrode frame with cyclic annular platform looks butt or the edge all around of diaphragm.
An annular boss or an annular groove is arranged on the inner wall surface of the middle part of the through hole of the electrode frame along the direction parallel to the surface of the flat-plate-shaped electrode frame. The annular boss or the annular groove is coaxial with the through hole;
the positive electrode and the negative electrode of the flow battery are respectively arranged in the through hole of the annular electrode frame, and the positive electrode and the negative electrode are respectively positioned on two sides of the diaphragm. Electrolyte inlet and outlet channels are respectively arranged on the two side surfaces of the electrode frame, and the electrolyte inlet channel and the electrolyte outlet channel on each side surface of the electrode frame are arranged on the opposite side surfaces of each side surface of the electrode frame.
The utility model provides an assembly of a flow battery electrode frame and a diaphragm, wherein the anode and the cathode share one electrode frame, the diaphragm is arranged on an annular platform in the middle of the electrode frame, and the thickness of the annular platform is smaller than that of the electrode frame and is arranged between the upper surface and the lower surface of the electrode frame; the peripheral edge of the diaphragm is arranged on the upper surface or the lower surface of the annular platform, and the peripheral edge of the diaphragm and the upper surface or the lower surface of the annular platform in the middle of the electrode frame can be sealed in a hot pressing or welding mode and the like; or the anode and the cathode share one electrode frame, and the diaphragm is embedded in an annular groove in the electrode frame; the peripheral edge of the diaphragm is arranged in the annular groove of the electrode frame, and the peripheral edge of the diaphragm and the annular groove of the electrode frame can be sealed in a hot pressing or welding mode and the like.
The thickness of the electrode frame is preferably 0.1-30 mm; more preferably 0.5-20 mm; most preferably 1-10 mm.
The thickness of the annular platform in the middle of the electrode frame is preferably 0.01-7 mm; more preferably 0.1-5 mm; most preferably 0.2-2 mm.
The thickness of the annular groove in the electrode frame is preferably 0.01-1 mm; more preferably 0.1-0.8 mm; most preferably 0.3-0.5 mm.
The material of the electrode frame can be one or more than two of any acid and alkali corrosion resistant materials such as polyethylene, polypropylene, polyvinyl chloride and the like. The thickness of the diaphragm is 20um-1mm, and the material of the diaphragm can be one or more than two of polyethylene, polypropylene, polyvinyl chloride and other materials which are free from acid and alkali corrosion.
The utility model realizes the technology that the positive electrode and the negative electrode are the same electrode frame in the flow battery for the first time; in the liquid stream battery assembling process, the utility model discloses a beneficial result:
1. the use of sealing materials is reduced, the assembly process of the flow battery is optimized, and the cost of the flow battery is reduced;
2. the use of the sealing gasket is reduced, the thickness of the battery is reduced, the volume of the battery is reduced, and the volumetric specific energy is improved;
3. the positive electrode and the negative electrode of the battery share one electrode frame, so that the battery assembly process is optimized, the sealing links in the assembly process of the flow battery are reduced, and the reliability of the galvanic pile is greatly improved.
4. The utility model discloses the suitable mode of redox flow battery electrode frame has been widened.
Drawings
Fig. 1 is a schematic structural diagram of embodiments 1, 2, 5, 6, 7, and 8 of the present invention;
fig. 2 is a schematic structural diagram of embodiments 1, 2, 5, 6, 7, and 8 of the present invention;
fig. 3 is a schematic structural diagram of embodiments 3, 4, 9, 10, 11, and 12 of the present invention;
fig. 4 is a schematic structural diagram of embodiments 3, 4, 9, 10, 11, and 12 of the present invention;
fig. 5 is a schematic structural diagram of a comparative example of the present invention.
Detailed Description
The following examples are further illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
Selecting a square polyethylene flat plate as a base material of an annular electrode frame 1 with a through hole in the middle, wherein the square polyethylene flat plate is 600mm long, 400mm wide and 8mm thick; flow channels 3 (which are respectively used as electrolyte inlet and outlet flow channels, and the electrolyte inlet flow channel and the electrolyte outlet flow channel on each side surface of the electrode frame are arranged on the two opposite side surfaces of the through hole on each side surface of the electrode frame) are respectively arranged on the two side surfaces of the electrode frame 1; the middle of the through hole (500 mm long, 300mm wide) of the electrode frame is provided with an annular platform 2 (with the same geometric symmetry central axis of the through hole), the thickness of the annular platform 2 is 1mm and divides the electrode frame 1 into two parts, the thickness of each part is 3.5mm, and the anode and the cathode of the battery are respectively arranged in the annular platform. As shown in fig. 1 and 2, fig. 2 is a sectional view of fig. 1 to better describe the present embodiment. The electrode frame 1 is used for assembling 10 sections of all-vanadium redox flow galvanic piles, and a diaphragm is a film containing polyethylene and has the thickness of 400 um. The peripheral edge of the diaphragm and the surface of one side of the annular platform 2 are sealed in a hot-pressing sealing mode, the maximum external leakage detection pressure of the assembled battery can be borne by the assembled battery and is 0.15MPa, and the thickness of the galvanic pile is 87 mm. At 160mA/cm2When the reactor is operated under the condition, the energy efficiency of the galvanic pile is 81.6 percent.
Example 2
Selecting a square polyethylene flat plate as a base material of an annular electrode frame 1 with a through hole in the middle, wherein the square polyethylene flat plate is 600mm long, 400mm wide and 8mm thick; flow channels 3 (which are respectively used as electrolyte inlet and outlet flow channels, and the electrolyte inlet flow channel and the electrolyte outlet flow channel on each side surface of the electrode frame are arranged on the two opposite side surfaces of the through hole on each side surface of the electrode frame) are respectively arranged on the two side surfaces of the electrode frame 1; the middle of the through hole (500 mm long, 300mm wide) of the electrode frame is provided with an annular platform 2 (with the same geometric symmetry central axis of the through hole), the thickness of the annular platform 2 is 1mm and divides the electrode frame 1 into two parts, the thickness of each part is 3.5mm, and the anode and the cathode of the battery are respectively arranged in the annular platform. As shown in fig. 1 and 2, fig. 2 is a sectional view of fig. 1 to better describe the present embodiment. The electrode frame 1 is used for assembling 10 sections of all-vanadium redox flow galvanic piles, and a diaphragm is a film containing polyethylene and has the thickness of 400 um. Sealing the peripheral edge of the diaphragm with a ring by laser weldingOne side surface of the platform 2 is sealed, the maximum leakage detection pressure of the assembled battery can be borne by 0.22MPa, and the thickness of the electric pile is 87 mm. At 160mA/cm2When the reactor is operated under the condition, the energy efficiency of the galvanic pile is 81.9 percent.
Example 3
Selecting a square polyethylene flat plate as a base material of the annular electrode frame 4 with a through hole in the middle, wherein the square polyethylene flat plate is 600mm long, 400mm wide and 8mm thick; flow channels 6 (which are respectively used as electrolyte inlet and outlet flow channels, and the electrolyte inlet flow channel and the electrolyte outlet flow channel on each side surface of the electrode frame are arranged on the two opposite side surfaces of the through hole on each side surface of the electrode frame) are respectively arranged on the two side surfaces of the electrode frame 4; the middle of the through hole (500 mm long, 300mm wide) of the electrode frame is provided with an annular groove 5 (with the through hole with the same geometric symmetry central axis), the thickness of the annular groove 5 is 400um and separates the electrode frame 4 into two parts, the thickness of each part is 3.8mm, and the anode and the cathode of the battery are respectively placed in the annular groove. As shown in fig. 3 and 4, fig. 4 is a cross-sectional view of fig. 3 to better illustrate the present embodiment. The electrode frame 4 is used for assembling 10 sections of all-vanadium redox flow galvanic piles, and a diaphragm is a film containing polyethylene and has the thickness of 400 um. The peripheral edge of the diaphragm and the annular groove 5 are sealed by adopting a hot-pressing sealing mode, the maximum external leakage detection pressure of the assembled battery can be 0.16MPa, and the thickness of the galvanic pile is 87 mm. At 160mA/cm2When the reactor is operated under the condition, the energy efficiency of the galvanic pile is 81.7 percent.
Example 4
Selecting a square polyethylene flat plate as a base material of the annular electrode frame 4 with a through hole in the middle, wherein the square polyethylene flat plate is 600mm long, 400mm wide and 8mm thick; flow channels 6 (which are respectively used as electrolyte inlet and outlet flow channels, and the electrolyte inlet flow channel and the electrolyte outlet flow channel on each side surface of the electrode frame are arranged on the two opposite side surfaces of the through hole on each side surface of the electrode frame) are respectively arranged on the two side surfaces of the electrode frame 4; the middle of the through hole (500 mm long, 300mm wide) of the electrode frame is provided with an annular groove 5 (with the through hole with the same geometric symmetry central axis), the thickness of the annular groove 5 is 400um and separates the electrode frame 4 into two parts, the thickness of each part is 3.8mm, and the anode and the cathode of the battery are respectively placed in the annular groove. As shown in fig. 3 and 4, fig. 4 is a cross-sectional view of fig. 3,to better describe the present embodiment. The electrode frame 4 is used for assembling 10 sections of all-vanadium redox flow galvanic piles, and a diaphragm is a film containing polyethylene and has the thickness of 400 um. The peripheral edge of the diaphragm and the annular groove 5 are sealed by adopting a laser welding sealing mode, the maximum external leakage detection pressure of the assembled battery can be 0.23MPa, and the thickness of the galvanic pile is 90 mm. At 160mA/cm2When the reactor is operated under the condition, the energy efficiency of the galvanic pile is 81.6 percent.
Examples 5 to 12
The test conditions and procedures of the electric pile are the same as those of the examples 1-4 (the unit of parameters is consistent), and the difference is that:
the middle of the electrode frame is provided with an annular platform 2, the thickness of the annular platform 2 is different (the structure is the same as that of the embodiment 1, and the difference is that the thickness of the annular platform 2 is different), and the thickness of the diaphragm is different; an annular groove 5 is formed in the electrode frame, the thickness of the annular groove 5 is different (the structure is the same as that of embodiment 1, and the difference is that the thickness of the annular groove 5 is different), and the thickness of the diaphragm is different;
the sealing modes of the diaphragm and the electrode frame are welding sealing.
Figure DEST_PATH_GDA0003170556470000041
From examples 5-12, it can be seen that the annular platform is too thin, the electrode compression ratio is too small, the electrochemical polarization becomes large, and the efficiency of the galvanic pile is reduced; the thickness of the annular platform is too thick, the electrode compression ratio is too large, the concentration polarization is increased, and the efficiency of the galvanic pile is reduced. The thickness of the annular groove is too thin, the compression ratio of the electrode is too small, and the electrochemical polarization becomes large; the thickness of the diaphragm selected when the groove is reduced, the barrier capability of the diaphragm is reduced, and the efficiency of the galvanic pile is obviously reduced; the thickness of the annular groove is too thick, the electrode compression ratio is too large, and the concentration polarization becomes large; and the thickness of the diaphragm selected by the thickening of the groove is thickened, the ohmic polarization of the diaphragm is increased, and the efficiency of the galvanic pile is obviously reduced.
Comparative example
The 10-section all-vanadium redox flow stack was assembled in a conventional manner. Selecting a square polyethylene flat plate as the materialThe vanadium redox flow battery is an annular electrode frame with a through hole in the middle, the length of the annular electrode frame is 600mm, the width of the annular electrode frame is 400mm, as shown in figure 5, the thickness of a positive electrode frame 7 is 4mm, the thickness of a negative electrode frame 11 is 4mm, the length of the through hole of the positive electrode frame and the through hole of the negative electrode frame are both 500mm, the width of the through hole of the positive electrode frame and the through hole of the negative electrode frame are both 300mm, a diaphragm 9 is the same as the membrane used in the embodiment 1, a sealing gasket 8 is arranged between the positive electrode frame 7 and the diaphragm 9, a sealing gasket 10 is arranged between the negative electrode frame 11 and the diaphragm 9, 10 sections of the assembled vanadium redox flow battery are 99mm in thickness, the maximum external leakage detection pressure of the battery is 0.12MPa, and the thickness of the battery is 103 mm. At 160mA/cm2When the reactor is operated under the condition, the energy efficiency of the galvanic pile is 71.9 percent.
In summary, the 10-section all-vanadium redox flow galvanic pile assembled by the electrode frame and the diaphragm assembly provided by the utility model has the advantages that firstly, no matter the method of hot pressing or laser welding is adopted (wherein the sealing reliability of the laser welding is superior to that of the hot pressing), the sealing reliability of the galvanic pile is superior to that of the traditional sealing mode by detecting the external leakage pressure; and in the process of assembling the electric pile, the positive electrode and the negative electrode share one electrode frame, so that the use of sealing materials is reduced, the assembly process of the flow battery is optimized, the thickness of the battery is reduced, the volume of the battery is reduced, and the volumetric specific energy is improved.

Claims (14)

1. The assembly of the electrode frame and the diaphragm of the flow battery is characterized by comprising an annular electrode frame with a through hole in the middle, wherein an annular boss or an annular groove is arranged on the inner wall surface in the middle of the through hole of the electrode frame, the diaphragm is placed in the through hole in the middle of the electrode frame, and the peripheral edge of the diaphragm is abutted against the annular platform or is placed in the annular groove in the electrode frame.
2. The assembly of claim 1, wherein an annular projection or an annular groove is formed on an inner wall surface of the central portion of the through hole of the electrode frame in a direction parallel to the surface of the flat plate-shaped electrode frame;
the peripheral edge of the diaphragm is hermetically connected with the annular platform or the annular groove, and the diaphragm divides the through hole of the electrode frame into two chambers which are not communicated with each other.
3. The assembly of claim 1, wherein the positive and negative electrodes of the flow battery are disposed within the through-holes of the annular electrode frame, respectively, the positive and negative electrodes being disposed on opposite sides of the separator, respectively.
4. The assembly of claim 1, wherein electrolyte inlet and outlet channels are formed on both side surfaces of the plate-shaped electrode frame, respectively, and the electrolyte inlet and outlet channels of each side surface of the electrode frame are formed on opposite side surfaces of the through hole of each side surface of the electrode frame.
5. Assembly according to claim 1 or 2,
the anode and the cathode share one electrode frame, the diaphragm is arranged on an annular platform in the middle of the electrode frame, and the annular platform is smaller than the electrode frame in thickness and is arranged between the upper surface and the lower surface of the electrode frame; the peripheral edge of the diaphragm is arranged on the upper surface or the lower surface of the annular platform, and the peripheral edge of the diaphragm and the upper surface or the lower surface of the annular platform in the middle of the electrode frame can be sealed in a hot pressing or welding mode and the like;
or the anode and the cathode share one electrode frame, and the diaphragm is embedded in an annular groove in the electrode frame; the peripheral edge of the diaphragm is arranged in the annular groove of the electrode frame, and the peripheral edge of the diaphragm and the annular groove of the electrode frame can be sealed in a hot pressing or welding mode and the like.
6. The assembly of claim 1, wherein the flat plate-like electrode frame has a thickness of 0.1 to 30 mm.
7. The assembly of claim 1, wherein the plate-like electrode frame has a thickness of 0.5 to 20 mm.
8. The assembly of claim 1, wherein the plate-like electrode frame has a thickness of 1 to 10 mm.
9. An assembly according to claim 1 or 2, wherein the annular platform intermediate the electrode frame has a thickness in the range of 0.01 to 7mm in a direction perpendicular to the surface of the electrode frame.
10. An assembly according to claim 1 or 2, wherein the annular platform intermediate the electrode frame has a thickness in the range of 0.1 to 5mm in a direction perpendicular to the surface of the electrode frame.
11. An assembly according to claim 1 or 2, wherein the annular platform intermediate the electrode frame has a thickness of 0.2-2mm in a direction perpendicular to the surface of the electrode frame.
12. An assembly according to claim 1 or 2, wherein the annular recess in the interior of the electrode frame has a thickness of 0.01 to 1mm in a direction perpendicular to the surface of the electrode frame.
13. An assembly according to claim 1 or 2, wherein the annular recess in the interior of the electrode frame has a thickness of 0.1-0.8mm in a direction perpendicular to the surface of the electrode frame.
14. An assembly according to claim 1 or 2, wherein the annular recess in the interior of the electrode frame has a thickness of 0.3-0.5mm in a direction perpendicular to the surface of the electrode frame.
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