CN112993310A - Battery flow passage sealing structure and application thereof - Google Patents
Battery flow passage sealing structure and application thereof Download PDFInfo
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- CN112993310A CN112993310A CN201911306886.1A CN201911306886A CN112993310A CN 112993310 A CN112993310 A CN 112993310A CN 201911306886 A CN201911306886 A CN 201911306886A CN 112993310 A CN112993310 A CN 112993310A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/028—Sealing means characterised by their material
- H01M8/0282—Inorganic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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
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Abstract
The invention provides a battery flow passage sealing structure and application thereof. The battery flow channel sealing structure is characterized in that a flow channel is arranged on a battery plate frame and is sealed; the unit cell is formed by enclosing an upper plate frame and a lower plate frame which are buckled together, a snake-shaped flow channel is formed in the upper surface of the lower plate frame and is sealed by a sealing ring, the cross section of the sealing ring is in a right-angle 7 shape, the top of the 7 shape is in contact with one surface of the upper plate frame, and the bottom of the 7 shape is in contact with one surface of the lower plate frame, which is provided with the flow channel. Aiming at the characteristics of large capacity and acidic electrolyte of the iron-chromium flow battery, the invention designs the sealing ring with a novel structure for sealing the flow channel and the carbon plate. The sealing structure increases the contact area between the sealing ring and the component, and can keep good sealing in operation; the invention selects ethylene propylene diene monomer material to make the sealing ring, can be used in acid liquid without corrosion, and can effectively prevent the liquid from leaking.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a sealing structure of a battery.
Background
Redox flow batteries are secondary batteries using liquid electrolytes as electrode active materialsDepending on the redox couple, there are classified as an all vanadium flow battery, a zinc bromine flow battery, a sodium polysulfide/bromine flow battery, a zinc/nickel flow battery, an iron/chromium flow battery, a vanadium/polyhalide flow battery, a zinc/cerium flow battery, and the like. Most of the structural materials of the redox flow battery are carbon materials, engineering plastics and the like, and the price is low; the battery can achieve extremely large capacity and the safety is guaranteed; because the power and the capacity of the battery are designed independently, the charging, discharging and capacity adjusting are flexible. Wherein the iron-chromium flow battery is made of Fe2 +/Fe3+And Cr2+/Cr3+An aqueous acid solution is the supporting electrolyte for the redox couple. During charging, Fe is generated at the positive electrode2+Oxidation reaction, the valence state of the active substance is increased; negative electrode generation of Cr3+Reduction reaction, reducing the valence state of the active substance; during discharging, the anode generates reduction reaction, and the valence state of the active substance is reduced; the oxidation reaction occurs at the negative electrode, and the valence state of the active substance is increased. The positive electrode and the negative electrode of the iron-chromium redox flow battery are both solutions, so that the safety is high; and the method has the advantages of large energy storage scale, long cycle life, environmental friendliness and the like, and is considered to be the flow battery energy storage technology with the greatest application prospect.
Because the redox flow battery adopts liquid electrolyte, the problems of large flow channel resistance reduction, strict sealing requirement of a battery outer frame and corrosion resistance of a battery structural material are brought while the capacity is flexible. When the flow battery operates, electrolyte can be driven into each single cell unit by an electrolyte pump under a larger pressure, the traditional sealing structure adopts an O-shaped or rectangular structure (referring to fig. 1, the left side is an O-shaped structure, and the right side is a rectangular structure), and the upper sealing surface and the lower sealing surface prevent liquid leakage. When the required liquid pressure is relatively high, there is a risk of liquid leakage due to the single-sided sealing of the structure. In addition, the traditional flow channel is designed into a straight flow channel, and the requirements of resistance drop and leakage current are not easily met during design.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a battery flow channel sealing structure.
The second purpose of the invention is to provide the application of the battery flow channel sealing structure in the iron-chromium redox flow battery.
The technical scheme for realizing the above purpose of the invention is as follows:
a battery flow passage sealing structure is characterized in that a flow passage is arranged on a battery plate frame and is sealed; the unit cell is formed by enclosing an upper plate frame and a lower plate frame which are buckled together, a snake-shaped flow channel is formed in the upper surface of the lower plate frame and is sealed by a 7-shaped sealing ring, the cross section of the 7-shaped sealing ring is in a right-angle 7 shape, the top of the 7-shaped sealing ring is in contact with one surface of the upper plate frame, and the bottom of the 7-shaped sealing ring is in contact with one surface of the lower plate frame, which is provided with the snake-shaped flow channel.
The snake-shaped flow channel comprises an oval or oblong liquid inlet, and the oblong is formed by changing two opposite edges of a rectangle into a circular arc shape; one end of a long shaft of the liquid inlet is connected with a flow channel which is bent back and forth, and the bent part is arc-shaped; the four sections of the flow channel bent back and forth are parallel to the long axis of the liquid inlet;
preferably, the ratio of the length of the long axis to the length of the serpentine flow channel parallel to the long axis is 1 (2-2.8).
For an oblong shape, the length of the major axis is the length of the rectangle plus two radii of the arcs.
When the individual cells are assembled into a cell stack, the liquid inlets of the stacked unit cells have the same shape and the same position, and share a flow channel.
The middle part of the lower plate frame is an area for placing an electrode, and the electrode is one of a carbon felt, carbon paper and a graphite felt; the last section of the snake-shaped flow channel entering the electrode area is vertical to the long axis of the ellipse and is connected to the electrolyte channel on the back of the lower plate frame through a vertical turnover hole.
According to a preferable technical scheme, the distance between adjacent flow channels parallel to the long axis of the liquid inlet is 0.2-0.3 time of the length of the parallel flow channels; and/or
The width of the flow channel which is bent back and forth is 6-8 mm.
The two sides of each section of the serpentine flow channel are respectively provided with the 7-shaped sealing ring, one 7-shaped sealing ring is a closed ring, and the 7-shaped opening direction of the 7-shaped sealing ring is back to the flow channel.
More preferably, the height of the 7-shaped sealing ring is 3.8-4.0 mm, and the height of the bent part back to the flow channel is 0.6-0.8 mm.
Wherein the 7-shaped sealing ring is made of ethylene propylene diene monomer, and the compression ratio is 15-25%; and/or
The lower plate frame is provided with a trapezoidal groove matched with the position where the 7-shaped sealing ring is placed.
The invention also has the preferable technical scheme that a carbon plate is arranged outside the upper plate frame and the lower plate frame, the outer edge of the carbon plate is sealed by a C-shaped sealing ring, and the outer edge of the carbon plate is positioned in a C-shaped opening; the inner surface and the outer surface of the C-shaped sealing ring are respectively provided with two waterlines which are parallel to the outer edge of the carbon plate, and the height of the protrusion of the waterline is 0.2-0.3 mm.
The C-shaped sealing ring is of an ethylene propylene diene monomer structure, and the compression ratio is 15-25%.
Furthermore, one surface of the upper plate frame, which is back to the snakelike flow passage, is provided with a rectangular groove, one surface of the lower plate frame, which is back to the snakelike flow passage, is also provided with a rectangular groove,
7-shaped sealing rings are placed in the rectangular grooves to form a sealing cavity (the 7-shaped sealing rings of the upper plate frame and the lower plate frame are opposite, and a diaphragm is pressed in the middle);
preferably, the upper plate frame and the lower plate frame are both made of chlorinated polyvinyl chloride (CPVC) materials.
The battery flow passage sealing structure is applied to an iron-chromium redox flow battery.
The invention has the beneficial effects that:
aiming at the characteristics of large capacity and acidic electrolyte of the iron-chromium flow battery, the invention designs the sealing ring with a novel structure for sealing the flow channel and the carbon plate. The sealing structure increases the contact area between the sealing ring and the component, and can keep good sealing in operation; the invention selects ethylene propylene diene monomer material to make the sealing ring, can be used in acid liquid without corrosion, and can effectively prevent the liquid from leaking.
The invention designs the snakelike flow channel between the liquid inlet and the outlet of the plate frame to balance the internal resistance drop and the leakage current and form a stable turbulent layer. The plate frame designed by the invention forms the cell stack, thereby not only saving the output consumption of the electrolyte pump, but also ensuring the long-term stability of the operation.
Drawings
Fig. 1 is a prior art seal structure.
Fig. 2 is a front view of the "7" seal ring of the present invention.
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
figure 4 is an enlarged view of a portion of the drawing,
FIG. 5 is a schematic perspective view of a 7-shaped seal ring;
FIG. 6 is a schematic perspective view of a lower plate frame (with the side with the flow channel facing upward);
FIG. 7 is a schematic view of the combination of the upper and lower plate frames;
FIG. 8 is a schematic sectional view of the upper and lower plate frames
Fig. 9 is a top view of a lower panel frame.
Fig. 10 is a view showing a structure of a C-type seal.
Fig. 11 shows the results of the fluid flow test.
In the figure, 1 is a 7-shaped sealing ring, 101 is a compression part, 102 is a supporting surface, and 103 is a sealing and fixing surface; 2 is the upper plate frame, 3 is the lower plate frame, 4 is snakelike runner, and 401 is the parallel section runner, and 5 is the inlet, and 6 is the electrolyte passageway, and 7 is the region of placing the electrode, and 8 are C type sealing washer, and 801 is the waterline, and 9 are the carbon plate, and 10 are the rectangular channel.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the examples, the technical means used are all the technical means existing in the field, unless otherwise specified.
Example 1
The embodiment provides a battery flow channel sealing structure, which is characterized in that a flow channel is arranged on a battery plate frame and is sealed; a unit cell is formed by an upper plate frame 2 and a lower plate frame 3 which are buckled together (see fig. 7 and 8), a snake-shaped flow channel 4 is arranged on the lower plate frame, the snake-shaped flow channel 4 is sealed by a 7-shaped sealing ring 1, and see fig. 2, 3 and 4: the cross section of the sealing ring is in a right-angle 7 shape, the top of the 7 shape is in contact with one surface of the upper plate frame, and the bottom of the 7 shape is in contact with one surface of the lower plate frame, which is provided with a flow passage.
Referring to fig. 6, the serpentine flow channel 4 includes a long circular liquid inlet 5, one end of the long axis of the liquid inlet 5 is connected to the serpentine flow channel 4 bent back and forth, and the bent portion is arc-shaped; the flow channel bent back and forth is provided with four parallel sections of flow channels 401 which are parallel to the long axis of the liquid inlet 5, and the ratio of the length of the long axis to the length of the snake-shaped flow channel parallel to the long axis is 1 (2-2.8). In the specific embodiment, the long axis of the oblong liquid inlet is 106mm, and the radius of the circular arc is R23 mm. The serpentine flow channel dimension parallel to the long axis was 215mm (from the center of the arc).
The middle part of the lower plate frame 3 is an area 7 for placing an electrode, the electrode is one of a carbon felt, carbon paper and a graphite felt, and the graphite felt is specifically selected as the electrode in the embodiment; the last section of the snake-shaped flow channel 4 entering the electrode area is vertical to the long axis of the ellipse and is connected with an electrolyte channel 6 on the lower plate frame through an overturning hole vertical to the plane of the plate frame.
The distance between adjacent flow channels parallel to the long axis of the ellipse is 0.15-0.3 times of the length of the parallel flow channels; in this embodiment, the distance between adjacent channels parallel to the major axis of the ellipse is 45mm (in terms of the center of the channel). The width of the flow channel is 7mm, and the depth is 3 mm.
The sealing rings are arranged on two sides of each section of the snake-shaped flow passage, one sealing ring is a closed ring (see figure 5), the opening direction of the 7 shape of the sealing ring is back to the flow passage,
referring to fig. 3, in the embodiment, the height of the 7-shaped sealing ring 1 is 3.83mm, and the height of the bent portion facing away from the flow channel is 0.7 mm. The sealing ring is made of ethylene propylene diene monomer, and the compression ratio is 20%.
Referring to fig. 7 and 9, a rectangular groove 10 is formed in one surface, facing the serpentine flow channel 4, of the upper plate frame 2, a rectangular groove is also formed in one surface, facing away from the serpentine flow channel, of the lower plate frame, and a 7-shaped sealing ring is placed in the rectangular groove to form a sealing cavity. The 7-shaped sealing rings of the upper plate frame and the lower plate frame are opposite, and a diaphragm is pressed in the middle. A carbon plate 9 is arranged outside the upper plate frame and the lower plate frame (the opposite middle of the upper plate frame and the lower plate frame is 'inner'), the outer edge of the carbon plate is sealed by a C-shaped sealing ring 8, and the outer edge of the carbon plate is positioned in a C-shaped opening, as shown in figure 10; the inner surface and the outer surface of the C-shaped sealing ring are respectively provided with two waterlines 801 parallel to the outer edge of the carbon plate, and the height of the protrusion of the waterlines is 0.25 mm. The C-shaped sealing ring of the embodiment adopts an ethylene propylene diene monomer structure, the total width is 4.8mm, the thickness of one layer is 1.2mm, and the compression ratio is 20%.
In this battery runner seal structure, go up the sheet frame and all adopt chlorinated polyvinyl chloride material CPVC to make with lower sheet frame, the little chamfer burring of sheet frame outer fringe, machining precision 3.2.
Application example 1
The battery flow channel seal structure described in example 1, applied to an iron-chromium redox flow battery. The battery is assembled into a 10kW battery stack, and a battery test is performed by using an electrolyte composed of ferric chloride, chromium chloride and hydrochloric acid. The liquid inlets of the stacked unit cells have the same shape and the same position, and share a flow channel.
According to the earlier stage test, the Reynolds number during flowing can not be in the range of 2000-4000, and the flowing is unstable in the range;
fe in electrolyte2+The concentration is 1.4mol/L, and the flow rate of the cell stack is 140L/min.
Calculating Reynolds number Re of the flow of the electrolyte and pressure drop, wherein
A fluid mechanics test shows that the structure ensures good flowing and lowest pressure drop of electrolyte, thereby realizing lowest leakage current and lowest energy consumption.
FIG. 11 is a simulation of electrolyte flow with a range of flow rates varying from 0 to 13.751 m/s. As can be seen from the figure, the distribution of the fluid forms a turbulent layer. Compared with the traditional linear flow channel, the snake-shaped flow channel effectively increases the length of the flow channel and forms a stable turbulent layer.
The structural parameters defined by the invention are obtained by comparing and optimizing through a plurality of tests. The following are some experimental examples.
Comparative test example 1
Adopting a structure similar to that of the embodiment 1, arranging a flow channel on the battery plate frame and sealing the flow channel; the snake-shaped flow passage 4 comprises a long round liquid inlet 5, one end of a long shaft of the liquid inlet 5 is connected with the snake-shaped flow passage 4 which is bent back and forth, and the bent part is arc-shaped; the flow channels bent back and forth are provided with five parallel sections of flow channels 01 which are parallel to the major axis of the ellipse, and the sizes of the liquid inlet and the flow channels are the same as those of the embodiment 1.
The cell test was carried out under the same conditions as in application example 1, and the leakage current was 5 times as high as that in application example 1 at the same flow rate.
Comparative test example 2
Adopting a structure similar to that of the embodiment 1, arranging a flow channel on the battery plate frame and sealing the flow channel; the snake-shaped flow passage 4 comprises a long round liquid inlet 5, one end of a long shaft of the liquid inlet 5 is connected with the snake-shaped flow passage 4 which is bent back and forth, and the bent part is arc-shaped; the flow channels bent back and forth are provided with four parallel sections of flow channels 01 which are parallel to the major axis of the ellipse, and the sizes of the liquid inlet and the flow channels are the same as those of the embodiment 1. The width of the flow channel is 5mm, and the depth is 3 mm. The long axis of the oblong liquid inlet is 106mm, and the radius of the circular arc is R23 mm. The serpentine flow channel dimension parallel to the long axis was 200mm (from the center of the arc).
The battery test was carried out under the same conditions as in application example 1, and the leakage current was 10 times as high as that in application example 1 at the same flow rate.
Application example 2
Because C type sealing washer receives when compressing, C type sealing washer through the waterline at first with the carbon plate contact, compress to certain degree contact at the back, can effectual increase area of contact, the schematic structure is as follows:
as can be seen from fig. 10, the C-type seal effectively increases the contact area relative to conventional sealing techniques, so that liquids above and below the carbon plate cannot mix.
When the upper plate frame contacts with the lower plate frame, the upper part of the 7-shaped sealing ring 1 is compressed, the bottom of the 7-shaped sealing ring 1 contacts with the lower plate frame, and the side edge of the 7-shaped sealing ring contacts with the groove wall of the lower plate frame. When the liquid flows into the snake-shaped flow passage through the oval liquid inlet passage, the liquid can be effectively prevented from permeating to the periphery along the flow passage,
referring to fig. 4, when the compression part 101 at the upper part of the 7-shaped sealing ring 1 is compressed during the assembly of the battery, the sealing ring is in contact with the parts through four planes, namely the compression part 101, the support surface 102, the sealing fixing surface 103 and the top surface of the sealing ring, so that the contact area can be effectively increased, and compared with the traditional sealing technology, the 7-shaped sealing can effectively increase the contact area, so that the liquid in the flow channel cannot seep out of the sealing ring.
The flow channel and the sealing structure in the embodiment 1 are adopted to assemble a 10KW electric pile, and the electric pile runs for 1000 hours without leakage under the condition that the flow is 140L/min, which indicates that the electric pile runs stably and has good sealing property.
Example 2
The embodiment provides a battery flow channel sealing structure, which is characterized in that a flow channel is arranged on a battery plate frame and is sealed; a unit cell is enclosed by upper plate frame 2 and lower plate frame 3 that the butt joint is in the same place and is become set up snakelike runner 4 on the lower plate frame, snakelike runner 4 is sealed by "7" style of calligraphy sealing washer 1: the cross section of the sealing ring is in a right-angle 7 shape, the top of the 7 shape is in contact with one surface of the upper plate frame, and the bottom of the 7 shape is in contact with one surface of the lower plate frame, which is provided with a flow passage.
The snake-shaped flow channel comprises an oval shared flow channel (a plurality of unit batteries are assembled, the liquid inlet 5 and the shared flow channel are in the same position), one end of the long axis of the oval is connected with the flow channel which is bent back and forth, and the bent part is arc-shaped; the flow passage bent back and forth is provided with four sections which are parallel to the long axis of the ellipse.
The middle part of the lower plate frame 3 is an area 7 for placing an electrode, the electrode is one of a carbon felt, carbon paper and a graphite felt, and the graphite felt is specifically selected as the electrode in the embodiment; the last section of the serpentine channel 4 entering the electrode area is perpendicular to the major axis of the ellipse and is connected to the electrolyte channel 6 on the lower frame.
Specifically, in this embodiment, the distance between adjacent flow channels parallel to the major axis of the ellipse is 36mm (as measured from the center of the flow channel), and the size of the flow channel parallel to the major axis is 240mm (as measured from the center of the arc-shaped bend). The width of the flow channel is 8 mm.
The sealing rings are arranged on two sides of each section of the snake-shaped flow passage, one sealing ring is a closed ring (see figure 5), and the opening direction of the shape of the 7 shape of the sealing ring is back to the flow passage.
In the embodiment, the height of the 7-shaped sealing ring 1 is 3.80mm, and the height of the bent part back to the flow channel is 0.7 mm.
The sealing ring is made of ethylene propylene diene monomer, and the compression ratio is 18.5%.
The unit cells of the structure further form a cell stack, a carbon plate is arranged between an upper plate frame and a lower plate frame of two adjacent unit cells, the outer edge of the carbon plate is sealed by a C-shaped sealing ring 8, and the outer edge of the carbon plate is positioned in a C-shaped opening; the inner surface and the outer surface of the C-shaped sealing ring are respectively provided with two waterlines 801 parallel to the outer edge of the carbon plate, and the height of the protrusion of the waterlines is 0.20 mm. The height of the waterline bulge is too low, and the processing is difficult. The C-shaped sealing ring adopts an ethylene propylene diene monomer structure, and the compression ratio is 18.5%.
In this battery runner seal structure, go up the sheet frame and all adopt chlorinated polyvinyl chloride material CPVC to make with lower sheet frame.
The structural battery can realize similar hydromechanical and electrochemical performances with the embodiment 1.
Although the present invention has been described in the foregoing by way of examples, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A battery flow passage sealing structure is characterized in that a flow passage is arranged on a battery plate frame and is sealed; the unit cell is characterized in that the unit cell is formed by enclosing an upper plate frame and a lower plate frame which are buckled together, a snake-shaped flow channel is formed in the upper surface of the lower plate frame and is sealed by a 7-shaped sealing ring, the cross section of the 7-shaped sealing ring is in a right-angle 7 shape, the top of the 7-shaped sealing ring is in contact with one surface of the upper plate frame, and the bottom of the 7-shaped sealing ring is in contact with one surface of the lower plate frame, which is provided with the snake-shaped flow channel.
2. The battery flow channel sealing structure according to claim 1, wherein the serpentine flow channel includes an oval or oblong liquid inlet, and two opposite sides of the oblong are modified into a circular arc shape; one end of a long shaft of the liquid inlet is connected with a flow channel which is bent back and forth, and the bent part is arc-shaped; the four sections of the flow channel bent back and forth are parallel to the long axis of the liquid inlet;
preferably, the ratio of the length of the long axis to the size of the flow channel parallel to the long axis is 1 (2-2.8).
3. The battery flow channel sealing structure of claim 2, wherein the middle of the lower plate frame is an area for placing an electrode, and the electrode is one of a carbon felt, a carbon paper and a graphite felt; the last section of the snake-shaped flow channel entering the electrode area is vertical to the long axis of the ellipse and is connected to the electrolyte channel on the back of the lower plate frame through a vertical turnover hole.
4. The battery flow channel sealing structure according to claim 2, wherein a flow channel pitch parallel to a long axis of the liquid inlet is 0.2 to 0.3 times a flow channel size in a direction parallel to the long axis; and/or
The width of the flow channel which is bent back and forth is 6-8 mm.
5. The battery flow channel sealing structure according to claim 1, wherein the 7-shaped sealing rings are arranged on both sides of each section of the serpentine flow channel, one 7-shaped sealing ring is a closed ring, and the 7-shaped opening direction of the 7-shaped sealing ring faces back to the flow channel.
6. The battery flow channel sealing structure according to claim 5, wherein the height of the 7-shaped sealing ring is 3.8-4.0 mm, and the height of the bent portion facing away from the flow channel is 0.6-0.8 mm.
7. The battery flow channel sealing structure according to any one of claims 1 to 6, wherein the 7-shaped sealing ring is made of ethylene propylene diene monomer, and the compression ratio is 15 to 25%; and/or
The lower plate frame is provided with a trapezoidal groove matched with the position where the 7-shaped sealing ring is placed.
8. The battery flow channel sealing structure according to any one of claims 1 to 6, wherein a carbon plate is arranged outside the upper plate frame and the lower plate frame, the outer edge of the carbon plate is sealed by a C-shaped sealing ring, and the outer edge of the carbon plate is positioned in the C-shaped opening; the inner surface and the outer surface of the C-shaped sealing ring are respectively provided with two waterlines which are parallel to the outer edge of the carbon plate, and the height of the protrusion of the waterline is 0.2-0.3 mm.
9. The battery flow channel sealing structure according to claim 8, wherein a rectangular groove is formed in one surface of the upper plate frame, which is back to the serpentine flow channel, a rectangular groove is also formed in one surface of the lower plate frame, which is back to the serpentine flow channel, and a 7-shaped sealing ring is placed in the rectangular groove to form a sealing cavity;
preferably, the upper plate frame and the lower plate frame are both made of chlorinated polyvinyl chloride materials.
10. Use of the battery flow channel sealing structure of any one of claims 1 to 9 in an iron-chromium redox flow battery.
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| CN201911306886.1A CN112993310A (en) | 2019-12-18 | 2019-12-18 | Battery flow passage sealing structure and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI820535B (en) * | 2021-12-13 | 2023-11-01 | 晟能科技有限公司 | Graphite felt fixed module and flow battery containing graphite felt fixed module |
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