KR20150007749A - Redox flow battery cell and seal structure - Google Patents

Abstract

Disclosed are a redox flow battery cell and a seal structure to increase the output density of a stack. In a cell frame which receives an electrolyte solution and a seal which is installed to the cell frame and prevents the leakage of the electrolyte solution, the cell frames face each other between partition layers. At least one pair of seal grooves formed in the cell frame shares a seal between the partition layers. When a combination force is applied to the partition layer, the seal, and the seal groove, a concentration stress in the cell frame of a part into which the seal is inserted is reduced, thereby reducing the possibility of the breakage of the cell frame due to the combination force in a stack assembly process and thinning the cell frame. Also, when the partition layer is inserted into the seal groove to touch the seal by pressure, an enough contact area between the seal and the partition layer is secured, thereby effectively preventing the leakage of the electrolyte solution.

Description

[0001] The present invention relates to redox flow cell and seal structure,

The present invention relates to a cell and a seal structure for a redox flow cell, more specifically, a structure in which two seal grooves share one seal, thereby reducing local stress of the cell frame and effectively preventing electrolyte leakage The present invention relates to a redox flow cell cell and a seal structure.

In recent years, efforts have been made to reduce greenhouse gas emissions worldwide due to environmental pollution and global warming. As part of this effort, we are promoting the introduction of new and renewable energy, developing eco-friendly vehicles, and developing electric power storage systems Various efforts have been tried.

Most of the electric power supply system is mainly composed of thermal power generation, but thermal power generation is a very serious problem of environmental pollution due to a huge amount of CO ₂ gas emitted due to the use of fossil fuel. To solve this problem, Wind power, solar energy, tidal power, etc.) is rapidly increasing.

Most renewable energy uses clean energy generated from nature, so it is attractive because it does not emit exhaust gas related to environmental pollution. However, since it is affected by natural environment, the output fluctuation over time is very large. .

Power storage technology is an important technology for efficient use of energy, such as efficient use of power, improvement of power supply system's capability and reliability, and introduction of new and renewable energy with a large fluctuation over time. There is a growing demand for Particularly, expectations for utilization of secondary batteries in these fields are increasing.

The redox flow secondary battery can be easily changed in energy storage capacity and power output by varying the capacity of the electrolyte tank and the number of battery stacks, and has the advantage of being used semi-permanently, so that a high capacity and high efficiency secondary battery Is the most popular secondary battery.

A redox flow secondary battery refers to a battery that charges and discharges by using a redox reaction of a metal ion whose oxidation number is changed. As the positive / negative electrode electrolytic solution, an acidic aqueous solution in which metal ions such as vanadium are dissolved is used and stored in different tanks.

In the redox flow secondary cell, the cell frame forms the outline of the entire cell, the center of the cell is separated by the diaphragm, and the electrodes of the anode and the cathode are positioned around the diaphragm. Also, a bipolar plate and a current collector for electric conduction are constituted, and the electrolyte inflow portion and the discharge portion of the redox flow secondary battery are connected to the electrolyte tank, and the electrolytic solution circulates and electrochemical reaction proceeds.

A cell stack having a plurality of cell frames stacked thereon is called a cell stack, and the stack output can be increased by repeatedly stacking cell frames, diaphragms, and cell frames.

It is important to seal the cell frame to prevent the electrolyte from leaking, because it contains the electrolyte therein. Sealing means include seals, which are housed in the cell frame to prevent leakage of the electrolyte. For example, in Japanese Patent Application No. 2005-3682244, in a symmetrical position of a frame frame opposed to each other, both seals are arranged in a diaphragm May have a problem of durability of the cell frame due to local stress, which makes it difficult to thin the cell frame. In addition, since the diaphragm on the surface where the seals collide with each other does not have a surface shape necessary for sealing the electrolyte, the electrolyte may leak due to the gap.

Japanese Patent Application No. 2000-3143613 discloses a structure in which a diaphragm is pressed between a single seal and a flat cell frame surface. This is because when the diaphragm is deformed due to diaphragm drying or the like, a small gap may leak electrolyte. If the electrolyte is leaked as described above, the capacity of the battery may be reduced as well as the durability of the system may be deteriorated. Therefore, it is urgent to develop a seal structure capable of reducing the local stress applied to the cell frame without leakage of the electrolyte.

It is an object of the present invention to reduce local stress generated between seals or seals and diaphragm, thereby reducing the risk of breakage of the cell frame due to the clamping force during stack assembly, enabling thinning of the cell frame, And to provide a redox flow battery cell and seal structure.

It is still another object of the present invention to provide a cell and a seal structure for a redox flow battery, in which electrolyte leakage is effectively prevented to enable stable operation of the battery cell stack and reliability of the system is improved.

It is another object of the present invention to provide a cell and a seal structure for a redox flow battery which can reduce the manufacturing cost of a stack because it can be reduced to half the conventional seal usage while improving airtightness,

And a seal for preventing electrolyte leakage, the cell frame being mounted on the cell frame, wherein the cell frame is composed of a plurality of unit frames facing each other with a diaphragm interposed therebetween, One or more seal grooves formed in the seal member are opposed to each other and the seal is shared with the seal member interposed therebetween.

When two seal grooves are formed on the same surface of the unit frame, the diaphragm is doubly sealed at a distance between the seals, thereby effectively preventing leakage of the electrolyte. At this time, it is preferable that the two seal grooves have a width of d1 and d2, respectively, and a width a between the centers of the two seal grooves is 0.5 (d1 + d2) < a <5 (d1 + d2). The seals can be staggered on different surfaces across the diaphragm, wherein the diaphragm can be bent in an "S" shape. The pair of seal grooves facing each other may have different depths and widths. By adjusting the depth and width of the seal grooves, the compressibility of the seal or the contact area between the seal and the diaphragm can be adjusted. The depth ratio of the seal groove for receiving the seal and the seal groove for not receiving the seal is preferably 1: 0.01 to 1. Further, the depth sum (a) of the seal groove for receiving the seal and the seal groove for not accepting the seal may have a relationship of 0.05b? B-a? 0.5b with the seal thickness (b). Here, (b-a) / b means the compression ratio of the seal, and it is preferred that the seal has a compression ratio of 5 to 50%. The width of the seal groove for receiving the seal and the width of the seal groove for not receiving the seal may be 1: 0.01 to 1. The seal groove or the seal may be coated with an adhesive for enhancing adhesive strength, a resin similar to a seal material for reinforcing the seal, a coating agent for enhancing the surface tension, and the seal may be an O-ring or a gasket. And the seal is formed along an outer peripheral surface of the cell frame.

In the present invention, not only the diaphragm position area but also the structure in which the seal grooves share the seal in the electrolyte inflow / outflow area can be applied. The cell frame is composed of a plurality of unit frames facing each other with a diaphragm interposed therebetween, and a pair of or more circular seal grooves formed around the electrolyte inflow / outflow portion of the unit frame face each other and share the seal. The depth of the seal groove that receives the seal and the depth of the seal groove that does not receive the seal may be 1: 0.01 to 1. Preferably, the two seal grooves have a width d1 and d2, respectively, and a width a between the centers of the two seal grooves is 0.5 (d1 + d2) < a <5 (d1 + d2). Further, the relationship (a) between the seal groove for accommodating the seal and the seal groove depth for not accepting the seal and the seal thickness (b) may be 0.05b? B? A? 0.5b.

A cell frame laminate structure for preventing an electrolyte from leaking to the outside, wherein the cell frame is formed by joining a pair of unit frames, an electrolytic solution flow path through which the electrolytic solution flows on a joint surface of the unit frame, A bipolar plate through which the electrolytic solution flows through the electrolytic solution flow path, and a protection plate for sealing the electrolytic solution flow path. A pair of seal grooves formed in each of the cell frames to be stacked face each other, and the seal is shared with the diaphragm interposed therebetween. Further, one or more seal grooves formed in the periphery of the electrolyte inflow / outflow portion of the cell frame face each other at the time of stacking the cell frames to share the seal. The seal may be an O-ring or a gasket.

According to the present invention, it is possible to reduce the local stress generated between the seals in the cell frame, reduce the risk of breakage of the cell frame due to the fastening force during stack assembly, enable thinning of the cell frame, .

In addition, it is possible to effectively prevent leakage of the electrolytic solution, to stably operate the battery cell stack, and to improve the reliability of the system.

In addition to this, it is possible to reduce the sealing capacity by half compared to the conventional sealing capacity, thereby reducing the manufacturing cost of the stack and improving the efficiency of the operation.

1 is a sectional view showing a configuration of the present invention.
2 is a cross-sectional view showing still another structure of the present invention.
3 is a cross-sectional view in which the diaphragm and the seal are engaged.
4 is a cross-sectional view showing another configuration in which the diaphragm and the seal are fastened.
5 is a cross-sectional view showing still another structure of the present invention.
6 is a cross-sectional view showing a configuration in which a sealer is applied with a coating agent.
7 is a cross-sectional view showing a structure in which a sealant is applied to a seal groove.
8 is a perspective view of a cell frame according to the present invention.

Hereinafter, the present invention will be described in detail.

1 is a cross-sectional view showing a structure 100 of the present invention. Referring to FIG. 1, the cell frame 5 has a structure in which a pair of unit frames 6a and 6b are joined, and an electrolyte flow path through which an electrolyte flows is formed on a bonding surface of the unit frame 6, (6), a bipolar plate (4) and a protection plate (7) for sealing the electrolyte flow path. A diaphragm is positioned between the cell frames 5 and an anode electrode 2 and a cathode electrode 3 are disposed between the diaphragm 1 and the bipolar plate 4. A seal groove (10) is formed in each unit frame (6), and the seal (11) is accommodated in the seal groove (10).

A plurality of cell frames 5 are stacked, and the anode liquid is circulated in the anode chamber where the anode electrode 2 is located, and the cathode liquid is circulated in the cathode chamber where the cathode electrode 3 is located.

A cell stack comprising a plurality of stacked cell frames 5 is referred to as a cell stack. By stacking the cell frame 5 repeatedly, the stack output can be increased.

The detailed configuration of the present invention will be described below.

The unit frame 6 faces each other with the diaphragm 1 therebetween. A pair of seal grooves 10 share the seal 11 on the same line of the unit frame 6 and the seal grooves 10 are formed in the respective unit frames 6.

The diaphragm 1 is pressed against the seal 11 when the cell frame 5 is stacked with the diaphragm 1 sandwiched therebetween and the diaphragm 1 is inserted into the seal groove 10 to improve the hermeticity And the electrolyte leakage can be effectively prevented.

Since the seal grooves 10 are formed on both sides of the diaphragm 1 and one seal 11 is inserted, the local stress is reduced in the cell frame 5 at the portion where the seal 11 is inserted This reduces the risk of breakage of the frame 5 due to the fastening force during stack assembly, and enables thinning. The diaphragm 1 is pressed by the seal 11 and inserted into the seal groove 10 so that the contact area between the diaphragm 1 and the seal 11 is And when the diaphragm 1 and the unit frame 6 are stacked and joined together, the electrolyte is not sealed and mixed, and the tightness of the stack is improved.

In addition, it is possible to reduce the unit cost of the stack because it can be reduced to half the amount of the conventional seal while improving the hermeticity, and the seal groove 10 is brought into close contact with the diaphragm 1 to prevent electrolyte leakage, , The reliability of the system can be improved.

It is preferable that the depth of the seal groove for receiving the seal in each unit frame 6 and the depth ratio of the seal groove for not receiving the seal is 1: 0.01 to 1. Further, the depth sum (a) of the seal groove for receiving the seal and the seal groove for not accepting the seal may have a relationship of 0.05b? B-a? 0.5b with the seal thickness (b). The width of the seal groove for receiving the seal and the width of the seal groove for not receiving the seal may be 1: 0.01 to 1.

A sealant (10) or a sealant (11) can be coated with a sealant to increase the adhesive strength, a resin similar to a sealant material to reinforce the seal, and a coating agent to increase the surface tension. Teflon or the like can be used as the coating agent for increasing the surface tension, and it is characterized in that it causes high friction or increases the surface tension to prevent electrolyte leakage.

The unit frame 6 may be made by mixing polyvinyl chloride or another organic resin such as polypropylene, polyethylene, epoxy resin or the like.

The O-ring or gasket may be made of a material such as natural rubber, organic resin, or synthetic rubber such as Viton. The bipolar plate 4 may be made of a plastic carbon material or a material having good electrical conductivity including graphite, carbon fine particles, Use materials.

Figure 2 is a cross-sectional view of yet another configuration 200 of the present invention. 2, the cell frame 5 has a structure in which a pair of unit frames 6a and 6b are joined, and an electrolyte flow path through which the electrolyte flows is formed on the joint surface of the unit frame 6, A bipolar plate 4 and a protection plate 7 for sealing the electrolyte flow path between the unit frames 6 are integrated. A diaphragm is positioned between the cell frames 5 and an anode electrode 2 and a cathode electrode 3 are disposed between the diaphragm 1 and the bipolar plate 4. A seal groove (10) is formed in each unit frame (6), and the seal (11) is accommodated in the seal groove (10).

The inner seal 11b housed in the unit frame 6 and the outer seal 11a located on the outer side of the inner seal 11b fix the diaphragm 1 and double the electrolyte Seal it.

A pair of inner peripheral seal grooves 10c and 10d and a pair of outer peripheral seal grooves 10a and 10b facing each other are formed in the unit frame 6 with the diaphragm 1 therebetween, 10d and the outer peripheral seal grooves 10a, 10b share one inner peripheral seal 11b and the outer peripheral seal 11a, respectively.

The diaphragm 1 is brought into pressure contact with the outer peripheral seal 11a and the inner peripheral seal 11b mounted on the outer peripheral seal grooves 10a or 10b and the inner peripheral seal grooves 10c or 10d by the fastening force and the diaphragm 1 is fitted to the outer peripheral seal grooves 10a or 10b, And the inner peripheral seal grooves 10c or 10d to improve airtightness.

Since the seals 11 are disposed on the opposite sides of the diaphragm 1, the diaphragm 1 can be constructed in a multi-sealing structure. The diaphragm 1 is inserted into the seal groove 10, The contact area between the seal 11 and the diaphragm 1 is sufficiently secured, and leakage of the electrolytic solution can be effectively prevented.

When the fastening force is applied in the unit frame laminating direction, since the seal grooves 10 on both sides in the same line on the diaphragm 1 share one seal 11, local stress reduction effect can be obtained, It can be thinned and has the advantage of increasing stack output density.

More specifically, the unit frames 6 face each other with the diaphragm 1 therebetween. One or more seal grooves 10 are formed in the unit frame 6 to share one seal 11. Inner seal grooves 10c and 10d and outer seal grooves 10a and 10b are formed at a position where the unit frame 6 and the diaphragm 1 abut each other. The inner peripheral seal grooves 10c and 10d and the outer peripheral seal grooves 10a and 10b share one inner peripheral seal 11b and the outer peripheral seal 11a, respectively. The outer peripheral seal grooves 10a and 10b and the inner peripheral seal grooves 10c and 10d are on both sides with the diaphragm 1 interposed therebetween when the diaphragm 1 and the cell frame 5 are stacked and fastened, The diaphragm 1 is pressed against the diaphragm 1 and the diaphragm is inserted into the seal groove 10 to enhance the hermeticity. The diaphragm 1 is pressed by the outer seal 11a and the inner seal 11b and is inserted into the outer seal grooves 10a and 10b and the inner seal grooves 10c and 10d to firmly fix the diaphragm 1, Thereby effectively preventing mixing and leakage of the electrolytic solution. The seal 11 is characterized by being an O-ring or a gasket.

The diaphragm sealing structure according to claim 1, wherein the diaphragm is double sealed with a distance between the outer seal (11a) and the inner seal (11b). The outer seal groove and the inner seal groove each have a width d1 and d2, It is preferable that the width a between the centers is 0.5 (d1 + d2) <a <5 (d1 + d2). It is preferable that the depth of the seal groove for receiving the seal in each unit frame 6 and the depth ratio of the seal groove for not receiving the seal is 1: 0.01 to 1. Further, the depth sum (a) of the seal groove for receiving the seal and the seal groove for not accepting the seal may have a relationship of 0.05b? B-a? 0.5b with the seal thickness (b). The width of the seal groove for receiving the seal and the width of the seal groove for not receiving the seal may be 1: 0.01 to 1. The seals may be arranged to be offset from each other with the diaphragm 1 interposed therebetween so that the diaphragm 1 and the seal groove 10 are adjacent to each other when the diaphragm 1 is inserted, S "shape so as to effectively prevent leakage of the electrolytic solution. The size of the diaphragm 1 is sufficient to accommodate the electrode and the seal 11.

The sealing grooves 10 or the seals 11 can be coated with adhesives for increasing the adhesive strength, resins similar to seal materials for reinforcing the seals, coating agents for increasing the surface tension, and the like with a thickness of 1 mm and a width of 2 mm or less. Teflon or the like can be used as the coating agent for increasing the surface tension, and it is characterized in that it causes high friction or increases the surface tension to prevent electrolyte leakage.

The unit frame 6 may be made by mixing polyvinyl chloride or another organic resin such as polypropylene, polyethylene, epoxy resin or the like.

The O-ring or gasket may be made of a material such as natural rubber, organic resin, or synthetic rubber such as Viton. The bipolar plate 4 may be made of a plastic carbon material or a material having good electrical conductivity including graphite, carbon fine particles, Use materials.

3 is a cross-sectional view in which the diaphragm 1 and the seal 11 are fastened. The depth of the seal groove 10 accommodating the seal 11 and the depth of the seal 11 in the seal grooves 10 formed on the unit frame 6 with the diaphragm 1 interposed therebetween The depth ratio of the seal grooves may be 1: 0.01 to 1. The depth a of the seal groove for receiving the seal and the seal groove for not receiving the seal and the seal thickness b are 0.05b? B - a? 0.5b, so that the compression ratio of the seal 11 It is preferably 5 to 50%. The width of the seal groove for receiving the seal and the width of the seal groove for not receiving the seal may be 1: 0.01 to 1.

Since the seal grooves 10 are formed on both sides of the diaphragm 1 and one seal 11 is inserted, the local stress is reduced in the cell frame 5 where the seal 11 is inserted, The risk of breakage of the cell frame 5 due to the fastening force during stack assembly can be reduced and thinning can be achieved. Further, the diaphragm 1 is inserted into the seal groove 10 and bent, and the contact area between the diaphragm 1 and the seal 11 is sufficiently secured by the seal groove 10, the seal 11, So that leakage of the electrolyte can be effectively prevented.

4 is a cross-sectional view showing another configuration in which the diaphragm 1 and the seal 11 are fastened. Referring to FIG. 1, in the plurality of seal grooves 10 formed in the unit frame 6, the seal grooves 10 have a multi-seal structure sealing the diaphragm with a spacing distance, and the seal grooves have widths d1 and d2 , And the width (a) between the centers of the seal grooves is 0.5 (d1 + d2) < a < 5 (d1 + d2). Preferably, in each unit frame 6, the depth of the seal grooves receiving the seals and the depth of the seal grooves not receiving the seals is 1: 0.01 to 1, the seal grooves accommodating the seals, The depth sum (a) of the seal grooves and the seal thickness (b) may be 0.05b? B - a? 0.5b. The width of the seal groove for receiving the seal and the width of the seal groove for not receiving the seal may be 1: 0.01 to 1. The seals are arranged to be offset from each other with the diaphragm 1 interposed therebetween so that when the seal groove 10, the seal 11 and the diaphragm 1 are pressed by the fastening force and the diaphragm 1 is inserted into the seal groove 10 , The diaphragm 1 is bent in an "S" shape, and electrolyte leakage can be effectively prevented.

5 is a cross-sectional view of yet another embodiment 300 of the present invention. Referring to FIG. 1, the cell frame 5 has a structure in which a pair of unit frames 6a and 6b are joined, and an electrolyte flow path through which an electrolyte flows is formed on a bonding surface of the unit frame 6, (6), a bipolar plate (4) and a protection plate (7) for sealing the electrolyte flow path. A diaphragm is positioned between the cell frames 5 and an anode electrode 2 and a cathode electrode 3 are disposed between the diaphragm 1 and the bipolar plate 4. A seal groove (10) is formed in each unit frame (6), and the seal (11) is accommodated in the seal groove (10).

A plurality of cell frames 5 are stacked, and the anode liquid is circulated in the anode chamber where the anode electrode 2 is located, and the cathode liquid is circulated in the cathode chamber where the cathode electrode 3 is located.

A cell stack comprising a plurality of stacked cell frames 5 is referred to as a cell stack. By stacking the cell frame 5 repeatedly, the stack output can be increased.

The detailed configuration of the present invention will be described below.

The unit frame 6 faces each other with the diaphragm 1 therebetween. The seal 11 is inserted into the seal groove 10 with a structure in which one or more seal grooves 10 formed in the unit frame 6 face each other and share the seal 11. The seal 11 has one unit frame 6 ). Since the plurality of seals 11 are located on the same plane, it is possible to prevent the seals from being separated from each other when the seals are arranged on the upper surface of each cell frame when the cell frame is assembled. Since the seal grooves 10 are formed on both sides of the diaphragm 1 and one seal 11 is inserted, local stress is reduced in the cell frame 5 at the portion where the seal 11 is inserted This reduces the risk of breakage of the cell frame 5 due to the fastening force during stack assembly, and enables thinning.

The diaphragm 1 is pressed by the seal 11 and inserted into the seal groove 10 to secure a sufficient contact area between the diaphragm 1 and the seal 11 by adding a bonding force in the stacking direction of the unit frame 6 When the diaphragm 1 and the unit frame 6 are stacked and fastened together, the electrolyte is not sealed and mixed, and the tightness of the stack is improved. It is possible to reduce the cost of the conventional seal while reducing the unit cost of the stack while effectively preventing leakage of the electrolyte. Thus, the battery cell stack can be operated stably and reliability of the system can be improved.

6 is a cross-sectional view showing a configuration in which the seal 11 is applied with a coating agent. Referring to this, it is possible to apply an adhesive for increasing the adhesive force to the seal 11, a resin similar to a seal material for reinforcing the seal, and a coating agent 30 for increasing the surface tension, and it can be applied with a thickness of 1 mm and a width of 2 mm or less . Teflon or the like can be used as the coating agent for increasing the surface tension, and it is characterized in that it causes high friction or increases the surface tension to prevent electrolyte leakage.

7 is a cross-sectional view showing a structure in which the seal groove 10 is coated with a coating agent. Referring to this, it is possible to apply an adhesive for increasing the adhesive force to the seal groove 10, a resin similar to a seal material for reinforcing the seal, a coating agent 30 for increasing the surface tension, etc., and it can be applied with a thickness of 1 mm and a width of 2 mm or less . Teflon or the like can be used as the coating agent for increasing the surface tension, and it is characterized in that it causes high friction or increases the surface tension to prevent electrolyte leakage.

8 is a perspective view of a seal groove formed around the electrolyte inflow / outflow portion of the cell frame. The cell frame 5 is a structure in which a pair of unit frames are joined. An electrolytic solution inflow / outflow portion 8 and a distribution passage 9 are formed on the joint surface of the unit frame, and a bipolar plate 4 and a protection plate for sealing the electrolyte flow path between the unit frames . A diaphragm is positioned between the cell frames 5 and an anode electrode 2 and a cathode electrode 3 are disposed between the diaphragm 1 and the bipolar plate 4. A plurality of cell frames 5 are stacked, and this is referred to as a cell stack. By stacking the cell frame 5 repeatedly, the stack output can be increased.

Details will be described below.

The cell frame 5 includes a plurality of unit frames facing each other with the diaphragm 1 interposed therebetween and includes a pair of or more circular seal grooves 20a formed in the periphery of the electrolyte inflow / 21a face the circular seal grooves 20b, 21b of the laminated cell frame 5 and share the seal. The seal is present to seal the electrolyte around the electrolyte inlet / outlet, and the seal may be an O-ring or a gasket.

 When two circular seal grooves are formed in the vicinity of the electrolyte inflow / outflow part 8 of the unit frame 5, the two circular seal grooves 20 and 21 have widths d1 and d2, respectively, It is preferred that the width a between the centers of the seal grooves is 0.5 (d1 + d2) <a <5 (d1 + d2). It is also preferable that the sum of the depths of the circular seal grooves for accommodating the seal and the circular seal grooves not containing the seal and the seal thickness (b) satisfy the relationship 0.05b? B - a? 0.5b, Is 5 to 50%. O-rings or gaskets used as seals can be made of natural rubber, organic resin, synthetic rubber such as Viton.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The present invention is not limited to the above-described embodiments, and various modifications and changes may be made thereto by those skilled in the art to which the present invention belongs. Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, are included in the scope of the present invention.

1: diaphragm 2: anode electrode
3: cathode electrode 4: bipolar plate
5: cell frame 6: unit frame
6a: first frame 6b: second frame
7: Protection plate 8: Electrolyte influx /
9: Electrolyte distribution channel 10: Seal groove
10a, 10b: outer seal grooves 10c, 10d: inner peripheral seal grooves
11: Seal 11a: Outer seal
11b: inner peripheral seal 20, 21: circular seal seal
20a, 20b: outer circular seal grooves 21a, 21b: inner circular seal groove
30: Coating agent

Claims (19)

1. A seal mounted on a cell frame for preventing electrolyte leakage, the seal comprising:
Wherein the cell frame is composed of a plurality of unit frames facing each other with a diaphragm interposed therebetween, and at least one pair of seal grooves formed in each of the unit frames faces the diaphragm, Seal structure. The method according to claim 1,
Wherein when two seal grooves are formed on the same surface of the unit frame, the two seal grooves have a width of d1 and d2, respectively, and a width a between the centers of the two seal grooves is 0.5 (d1 + d2) < (d1 + d2). < / RTI &gt; 3. The method of claim 2,
Wherein the seals are arranged to be offset from each other across the diaphragm. The method according to claim 1,
Wherein the depth of the seal groove for receiving the seal and the depth ratio of the seal groove for not receiving the seal are 1: 0.01 to 1. The method according to claim 1,
Wherein a sum (a) of a seal groove for accommodating the seal and a depth of a seal groove for not receiving the seal and a seal thickness (b) satisfy 0.05b? B? A? 0.5b. The method according to claim 1,
Wherein a width of a seal groove for receiving the seal and a width ratio of a seal groove for not receiving the seal are 1: 0.01 to 1. The method according to claim 1,
And an adhesive for increasing the adhesive force is applied to the seal groove or the seal. The method according to claim 1,
And the seal is reinforced by applying a resin similar to a seal material to the seal groove or the seal. The method according to claim 1,
Wherein the seal groove or the seal is coated with a coating agent for increasing the surface tension. The method according to claim 1,
Wherein the seal is formed along an outer circumferential surface of the cell frame. The cell frame includes a plurality of unit frames facing each other with a diaphragm interposed therebetween, and a pair of seal grooves formed around the electrolyte inflow / outflow portions of the cell frame face each other, rescue. 12. The method of claim 11,
Wherein a depth of a seal groove for accommodating the seal and a depth ratio of a seal groove for not containing the seal are 1: 0.01 to 1. 12. The method of claim 11,
Wherein a sum (a) of a seal groove for accommodating the seal and a depth of a seal groove for not containing the seal and a seal thickness (b) are 0.05 b? B-a? 0.5b. 12. The method of claim 11,
Wherein when two seal grooves are formed on the same surface of the unit frame, the two seal grooves have a width of d1 and d2, respectively, and a width a between the centers of the two seal grooves is 0.5 (d1 + d2) < (d1 + d2). < / RTI &gt; A cell for preventing an electrolyte solution in a stacked cell frame from leaking to the outside,
The plurality of cell frames;
A diaphragm positioned between the cell frames;
A pair of seal grooves formed in each of the cell frames;
A seal received in the seal grooves facing each other with the diaphragm interposed therebetween;
Further comprising: a redox flow cell. 16. The method of claim 15,
The cell frame
A bipolar plate disposed on both sides of the diaphragm;
A unit frame attached to both sides of the outer periphery of the bipolar plate;
A protection plate disposed between the unit frames;
An electrode disposed between the diaphragm and the bipolar plate;
An electrolyte inflow / outflow part and a distribution path formed in the frame;
A pair of seal grooves formed around the electrolyte inflow / outflow portion;
A seal received in a pair of seal grooves facing each other;
Further comprising: a redox flow cell. 16. The method of claim 15,
Wherein the seals are staggered on different surfaces with the diaphragm interposed therebetween. 17. The method according to claim 15 or 16,
Wherein the depth of the seal groove for receiving the seal and the depth of the seal groove for not receiving the seal are in a range of 1: 0.01 to 1. 17. The method according to claim 15 or 16,
Wherein a sum (a) of a seal groove for accommodating the seal and a depth of a seal groove for not containing the seal and a seal thickness (b) satisfy 0.05b? B? A? 0.5b.

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