KR101688975B1 - Zinc-bromine flow battery stack - Google Patents

Abstract

Disclosed is a redox flow battery stack. The disclosed redox flow battery stack comprises: a plurality of continuously stacked unit cells including an electrode flow frame and a membrane flow frame; and both side end plates disposed on an outermost side of the unit cells. The redox flow battery stack further comprises: (i) a supply penetration flow path penetrating along a stacked direction of the unit cells and supplying a supplying fluid to the electrode flow frame; (ii) a supply manifold hole formed on the end plate on one side and connected to one end of the supply penetration flow path; (iii) a connection hole formed on the end plate on the other side and connected to the other end of the supply penetration flow path; and (iv) a supply socket member inserted into the connection hole, blocking the other end of the supply penetration flow path, and having a flow path groove connected to the other end of the supply penetration flow path.

Description

Redox Flow Battery Stack {ZINC-BROMINE FLOW BATTERY STACK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redox flow cell stack, and more particularly, to a redox flow cell stack capable of reducing fluctuation in flow rate of an electrolyte between cells.

In general, redox flow cells are characterized by being low in maintenance cost, capable of operating at room temperature, and capable of independently designing their capacities and outputs, and thus much research has been conducted on large capacity secondary batteries in recent years.

A redox flow cell is a secondary battery that can charge and discharge electric energy by forming a stack by arranging a membrane, an electrode, and a bipolar plate in a series similar to a fuel cell. Function.

In the redox flow cell, the positive and negative electrode electrolytic solution supplied from the positive and negative electrode electrolyte storage tanks on both sides of the membrane are circulated and ion exchange is performed. In this process, electrons move to charge and discharge.

Such a redox flow cell is known to be most suitable for an energy storage system (ESS) that stores a large amount of electric power because it can be manufactured as a medium to large-sized system of kW to MW class, as compared with a conventional secondary battery.

On the other hand, the redox flow cell is exemplified by a zinc-bromine flow cell. The electrode flow frame and the membrane flow frame are unit cells. Are stacked in plural pieces and can be configured as a stack.

An end plate is provided on the outermost side of a plurality of unit cells in the stack to press unit cells, to inject an electrolyte into the electrode flow frame, and to discharge electrolyte flowing through the electrode flow frame.

The positive electrode electrolyte and the negative electrode electrolyte are supplied to the respective electrode flow frames through the end plates and flow upwardly or downwardly by gravity or pressure along the flow channel of the electrode flow frame and can be discharged through the end plates.

To this end, the unit cells of the stack are provided with through-flow passages as manifolds for supplying and discharging the electrolytes of the positive and negative electrodes, respectively, and the through-flow passages are connected to the flow channel in the corresponding electrode flow frames of the positive or negative electrode electrolyte. A manifold hole is formed in the end plate, which is connected to the through-flow passage of the unit cells and supplies and discharges the electrolyte.

For example, the through-flow passages of the unit cells are connected to a supply through-flow passage connected to the electrolyte supply manifold hole of one end plate, a supply through-flow passage through the flow channel of the electrode flow frame, And an exhaust through-flow passage connected to the hole.

One end of the supply flow path is connected to the electrolyte supply manifold hole of one end plate, and the other end is blocked by the other end plate. One end of the discharge passage is blocked by one end plate, and the other end is connected to the electrolyte discharge manifold hole of the other end plate.

The electrolyte solution injected through the electrolyte supply manifold hole of the one end plate flows along the supply flow passage, flows into the flow channel of the electrode flow frame, flows along the discharge flow passage, and flows through the electrolyte discharge manifold hole Lt; / RTI >

Here, the electrolytic solution flowing along the supply through-flow path can be introduced into the channel channel of the electrode flow frame by striking the other end plate at the other end of the supply through-flow path.

However, in the prior art, as the electrolyte collides against the end plate at the other end of the supply through-flow passage, unstable flow such as vortex can be caused. Therefore, in the prior art, the electrolytic solution does not flow smoothly into the unit cells at the closed end side of the supply through-flow passage, and can flow at a flow rate smaller than the reference flow rate.

Therefore, in the prior art, the electrolytic solution is not uniformly distributed in all the unit cells, and the inter-cell flow rate fluctuation occurs, so that the output performance and energy efficiency of the stack can be lowered.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention are directed to a redox flow cell stack which improves the flow structure of the electrolyte solution to the unit cells and the end plate, reduces the supply flow deviation of the unit cells, and increases the output performance and energy efficiency of the stack. .

The redox flow cell stack according to an embodiment of the present invention includes a plurality of unit cells continuously stacked including an electrode flow frame and a membrane flow frame and both end plates disposed at the outermost sides of the unit cells A supply through-flow passage formed in the unit cells in the stacking direction to supply the supply fluid to the electrode flow frame, ii) a supply flow passage formed in one end plate, connected to one end of the supply flow passage, (Iii) a connection hole formed in the other end plate, the connection hole being connected to the other end of the supply through-flow passage; (iv) a connection hole formed in the connection hole and closing the other end of the supply through- And a supply socket member having a flow channel connected to the other end of the flow path.

The redox flow cell stack according to an embodiment of the present invention may be formed separately from the supply throughflow channels along the stacking direction in the unit cells and may be connected to the supply throughflow channel through the flow channel of the electrode flow frame. And a discharge through-flow passage for discharging the supply fluid.

In addition, in the redox flow cell stack according to the embodiment of the present invention, one end of the discharge passage may be closed by the one end plate.

Also, in the redox flow cell stack according to the embodiment of the present invention, the discharge manifold hole connected to the other end of the discharge passage may be formed on the other end plate.

The redox flow cell stack according to an embodiment of the present invention may include a discharge socket member fitted in the discharge manifold hole and having a flow hole connected to the other end of the discharge flow passage.

Also, in the redox flow cell stack according to an embodiment of the present invention, the supply socket member and the discharge socket member may be made of any one of plastic materials selected from PE, PP, PVC, PVDP and PTFE having insulation and chemical resistance ≪ / RTI >

Further, in the redox flow cell stack according to the embodiment of the present invention, the supply socket member has an outer diameter surface corresponding to the inner diameter surface of the connection hole, and a closing surface for closing the connection hole, And the flow path groove can be formed on the opposite surface.

In addition, in the redox flow cell stack according to the embodiment of the present invention, the supply socket member may be provided with a thickness equal to or more than the thickness of the end plate.

In addition, in the redox flow cell stack according to the embodiment of the present invention, the supply socket member may be provided with a thickness corresponding to 100 to 500% of the end plate thickness.

Further, in the redox flow cell stack according to the embodiment of the present invention, the inner diameter of the flow path groove may be 10 to 100% of the diameter of the supply through path.

Further, in the redox flow cell stack according to the embodiment of the present invention, the depth of the flow path groove may be 1 mm or more.

Also, in the redox flow cell stack according to an embodiment of the present invention, the flow path groove may have a taper shape whose diameter gradually decreases toward the closing surface.

In addition, in the redox flow cell stack according to the embodiment of the present invention, the flow path groove may be formed to have a taper angle of 1 to 75 degrees.

Also, in the redox flow cell stack according to the embodiment of the present invention, the supply socket member may be provided with an o-ring.

In the embodiments of the present invention, unlike the prior art in which the supply fluid strikes the closed surface of the end plate at the other end of the supply through passage and unstable flow of supply fluid such as vortex occurs, The flow of the supply fluid at the inlet side can be stably induced.

Thus, in the embodiment of the present invention, the supply fluid can flow smoothly into the flow channel of the electrode flow frame at the set reference flow rate at the other end side of the supply flow passage, thereby reducing the supply flow deviation of all the unit cells, Performance and energy efficiency.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is an exploded perspective view schematically illustrating a redox flow cell stack according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a redox flow cell stack according to an embodiment of the present invention.
3 (a) and 3 (b) are views showing a supply socket member applied to a redox flow cell stack according to an embodiment of the present invention.
4 (a) and 4 (b) are views showing a modification of the supply socket member applied to the redox flow cell stack according to the embodiment of the present invention.
5 (a) and 5 (b) are views showing a discharge socket member applied to a redox flow cell stack according to an embodiment of the present invention.
6 is a view for explaining the operational effect of the redox flow cell stack according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish the components from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

FIG. 1 is an exploded perspective view schematically showing a redox flow cell stack according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing a redox flow cell stack according to an embodiment of the present invention. The structure of redox flow cell stack 100 in the drawings is only for illustrating the present invention, and the present invention is not limited thereto. Therefore, the redox flow cell stack 100 in the drawing has a basic configuration and can be modified into various forms.

Referring to FIGS. 1 and 2, a redox flow cell stack 100 according to an embodiment of the present invention includes a unit cell 10 formed of an electrode flow frame 11 and a membrane flow frame 13, And the unit cells 10 of each unit may be constituted by an electricity generating assembly in which the unit cells 10 are continuously arranged / laminated.

For example, the unit cells 10 may be mutually fused by vibration welding, may be composed of an electricity generation aggregate, may be pressurized / fastened through separate fastening means and may be composed of an electricity generating aggregate, Side end plates 21 and 22 are provided on the outermost side of the base plate 10, respectively.

The unit cells 10 may include a zinc-bromine flow cell according to a cathode electrolyte and a cathode electrolyte. The positive electrode electrolyte solution and the negative electrode electrolyte solution circulate through the electrode flow frame 11 separately in the unit cells 10 and can be ion-exchanged in the membrane flow frame 13.

That is, the positive electrode electrolyte solution and the negative electrode electrolyte solution are stored in the electrolyte solution storage tank, and are supplied to the unit cells 10 at the pressure of the pump, circulated to the electrode flow frame 11 of the corresponding electrode, and discharged to the outside.

In the unit cells 10, the respective flow paths for supplying and discharging the respective anode and cathode electrolytic solutions to and from the electrode flow frame 11 of the corresponding electrode are formed separately.

However, in the drawings of the present invention, one of the positive electrode electrolyte solution and the negative electrode electrolyte solution (hereinafter referred to as "supply fluid") is injected (supplied) into the unit cells 10, And is discharged to the outside.

The supply fluid may be injected through the manifold of one end plate 21 and may be supplied to the unit cells 10 and discharged through the manifold of the other end plate 22. [

The redox flow cell stack 100 according to the embodiment of the present invention improves the flow structure of the supply fluid to the unit cells 10 and the end plates 21 and 22 so that the supply flow rate deviation ), And has a structure capable of increasing the output performance and energy efficiency of the entire stack.

For this, the redox flow cell stack 100 according to the embodiment of the present invention basically includes a supply passage 30 and a discharge passage 50 formed in the unit cells 10.

The supply through-flow passage 30 is for supplying the supply fluid to the electrode flow frame 11 of the unit cells 10 and is formed to penetrate the unit cells 10 along the stacking direction.

The supply flow passage 30 is connected to the flow channel 12 of the electrode flow frame 11 so that the supply fluid flows along the supply flow passage 30 and can be distributed to the electrode flow frame 11.

One end plate 21 as described above is provided with a supply manifold hole 23 connected to one end (supply fluid inlet end) of the supply through-flow passage 30 for supplying the supply fluid to the supply through- ).

Meanwhile, in the embodiment of the present invention, the other end plate 22 corresponding to the other end of the supply through-flow passage 30 is formed with a connection hole 25 connected to the other end of the supply through-flow passage 30. For example, the connection hole 25 may be formed with a hole having a diameter that is relatively larger than the cross-sectional diameter of the supply through-flow passage 30.

Although the cross-sectional shape of the supply through-flow passage 30 is described as a circle having a predetermined diameter, the present invention is not necessarily limited to this, and the cross-sectional shape of the supply through-flow passage 30 may be various shapes such as an ellipse and a polygon And the connection hole 25 may also have a shape corresponding to the cross-sectional shape of the supply through-flow passage 30.

In the embodiment of the present invention, the connection hole 25 is provided with a supply socket member 70 for closing the other end of the supply through-flow passage 30. The supply socket member 70 has a shape corresponding to the connection hole 25 and can be fitted and fixed in the connection hole 25 thereof.

The supply socket member 70 is made of a plastic material having an insulating property and a chemical resistance that does not react with a supply fluid. For example, the supply socket member 70 is made of any one of plastic materials selected from PE, PP, PVC, PVDP and PTFE .

Furthermore, in the embodiment of the present invention, the supply socket member 70 forms a flow path groove 71 having a predetermined diameter and depth, which is connected to the other end of the supply through-flow passage 30. 3, the supply socket member 70 has an outer diameter surface 73 corresponding to the inner diameter surface of the connection hole 25 and a closing surface 75 for closing the connection hole 25. The flow path groove 71 according to the embodiment of the present invention is formed on the opposite surface 77 of the closing surface 75, that is, the surface facing the other end of the supply through flow path 30.

Unlike the prior art in which the supply fluid directly hits the closed surface of the other end plate 22 at the other end of the supply through-flow passage 30, the flow grooves 71 extend the flow of the supply fluid by the depth of the groove .

That is, unlike the prior art in which the supply fluid strikes the closed surface of the other end plate 22, which is in contact with the other end of the supply through passage 30, in the supply socket member 70 according to the embodiment of the present invention, It is possible to extend the flow of the supply fluid to the predetermined region of the supply pipe 71.

The supply socket member 70 according to the embodiment of the present invention is provided with a size corresponding to the connection hole 25. Here, the outer diameter of the supply socket member 70 is such that it can be inserted and fixed in the connection hole 25. The inner diameter of the flow path groove 71 may be the same as the cross-sectional diameter of the feed through flow path 30, and may be smaller or larger than the cross-sectional diameter of the feed through-flow path 30.

For example, the inner diameter of the flow path groove 71 may be 10 to 100% of the diameter of the feed through flow path 30, and the depth of the flow path groove 71 (extension length of the supply fluid) may be 1 mm or more .

The thickness of the supply socket member 70 may be equal to or greater than the thickness of the other end plate 22, and may be variously changed depending on the depth of the flow path groove 71 or the structure of the stack.

For example, the supply socket member 70 may be provided with a thickness equal to or greater than the thickness of the other end plate 22, and may be provided with a thickness corresponding to 100 to 500% of the thickness of the end plate 22 have.

In addition, in the embodiment of the present invention, the supply socket member 70 is provided with an o-ring 80 for preventing leakage of the supply fluid. The o-ring 80 is mounted on the opposite surface 77 of the closure surface 75 already mentioned in the supply socket member 70. The o-ring 80 is provided as a seal ring that can prevent the supply fluid from leaking between the other end of the supply through-flow passage 30 and the opposite surface 77.

The o-ring 80 is made of a rubber material and has an outer diameter 73 of the supply socket member 70 and an inner diameter of the flow path groove 71 of the supply socket member 70 on the opposite surface 77 of the supply socket member 70, And is fitted in a semicircular ring groove 79 formed in the area.

4 (a) and 4 (b) are views showing a modification of the supply socket member applied to the redox flow cell stack according to the embodiment of the present invention.

4, a modified example of the supply socket member 70 according to the embodiment of the present invention includes a tapered channel groove 71 whose diameter gradually decreases from the opposite surface 77 to the closed surface .

For example, the flow path groove 71 gradually decreases in diameter toward the closed surface from the opposite surface 77 of the supply socket member 70, and an inner diameter surface tapered at 1 to 75 degrees can be formed.

The reason why the flow grooves 71 are formed in a tapered shape is that when the supply fluid flows into the region of the flow grooves 71 from the other end of the supply flow passage 30 and the flow of the supply fluid is extended, So that it can easily flow out from the region of the flow path groove 71 and flow smoothly into the flow path channel 12 of the electrode flow frame 11. [

1 and 2, the discharge passage 50 according to the embodiment of the present invention flows along the supply flow passage 30 of the unit cells 10 and flows through the flow channel of the electrode flow frame 11 (12) to the outside of the unit cells (10).

The discharge flow passage 50 is formed separately from the supply flow passage 30 in the unit cells 10 and is connected to the supply flow passage 30 through the flow channel 12 of the electrode flow frame 11 .

Here, one end of the discharge through-flow passage (50) is closed by one end plate (21). In order to discharge the supply fluid from the discharge passage 50 as described above, the other end plate 22 has a discharge manifold hole 29 connected to the other end (supply fluid discharge end) of the discharge passage 50 .

In the embodiment of the present invention, a discharge socket member 90 is fitted and installed in the discharge manifold hole 29. As shown in FIG. 5, the discharge socket member 90 is provided with a discharge through- 50 formed at the other end thereof.

Furthermore, the discharge socket member 90 may be provided with an o-ring 80 which can prevent the supply fluid from leaking between the other end of the discharge through-flow passage 50 and the discharge socket member 90.

The discharge socket member 90 is made of a plastic material having insulation and chemical resistance that does not react with the supply fluid. For example, the discharge socket member 90 is made of any one of plastic materials selected from PE, PP, PVC, PVDP and PTFE .

Hereinafter, the operation of the redox flow cell stack 100 according to an embodiment of the present invention will be described in detail with reference to the drawings.

First, in the embodiment of the present invention, the supply fluid (the anode electrolyte or the cathode electrolyte) stored in the storage tank (not shown) is injected into the supply manifold hole 23 of the one end plate 21 as the pressure of the pump .

The supply fluid then flows along the supply flow passage 30 of the unit cells 10 through the supply manifold hole 23 of the one end plate 21 and flows through the flow channel 12 of the electrode flow frame 11 ), And ion exchange is performed in the membrane flow frame 13.

Since the other end of the supply through-flow passage 30 opposite to the supply fluid inflow end is clogged by the supply socket member 70 fitted in the connection hole 25 of the other end plate 22, Can flow into the flow channel 12 of the electrode flow flame 11 from the flow channel 30.

The supply fluid circulating through the flow channel 12 of the electrode flow frame 11 flows along the discharge passage 50 of the unit cells 10 as described above, And is discharged through the manifold hole 29. At this time, the supply fluid may be discharged through the flow passage hole 91 of the discharge socket member 90 provided in the discharge manifold hole 29 of the other end plate 22.

Meanwhile, in the process of supplying the supply fluid to the supply through-flow passage 30 of the unit cells 10 as described above, since the flow groove 71 is formed in the supply socket member 70 in the embodiment of the present invention , The flow of the supply fluid can be extended from the other end of the supply through passage 30 to the predetermined region of the flow passage groove 71.

Therefore, unlike the prior art in which the supply fluid hits the closed surface of the other end plate 22 which is in contact with the other end of the supply through-flow passage 30, the supply fluid flows from the other end of the supply through- Flows into the flow extending region of the flow path groove 71 and exits from the flow path groove 71 and can flow smoothly into the flow path channel 12 of the electrode flow frame 11. [

Therefore, in the embodiment of the present invention, unlike the prior art in which the supply fluid strikes the closed surface of the other end plate 22 at the other end of the supply through passage 30 and unstable flow of the supply fluid such as vortex occurs, The flow of the supply fluid at the other end of the supply through-flow passage 30 can be steadily guided through the flow path groove 71 of the member 70.

As a result, in the embodiment of the present invention, the supply fluid can smoothly flow into the flow channel 12 of the electrode flow frame 11 at a predetermined reference flow rate at the other end side of the supply flow passage 30, ), And the output performance and energy efficiency of the stack can be increased.

That is, in the embodiment of the present invention, the supply fluid is uniformly distributed in all the unit cells 10, thereby reducing the distribution deviation of the supply fluid flowing into all the unit cells 10 and maximizing the output and energy efficiency of the stack have.

Experimental Example

Hereinafter, the stack of the embodiment to which the supply socket member 70 having the flow path groove 71 is applied and the stack of the comparative example to which the supply socket member 70 is not applied are respectively fabricated into 60 cells, The charge / discharge efficiency of the stack was tested.

In this experiment, the charge time and the discharge time were kept the same, and the experiment was carried out with the constant amount of current, which is another factor affecting the charge / discharge efficiency of the stack.

In the experiment, the charging time and discharging time were the same for 20 hours and 20 hours, respectively, and the discharge time was 3 hours and 30 minutes at 17 hours. The charge and inversion times were the same. The external factors that could affect the performance were the same.

The stacking and discharging efficiencies of the examples and comparative examples division Current efficiency (%) Voltage efficiency (%) Energy efficiency (%) Example 81.5 86.0 70.1 Comparative Example 81.5 84.4 68.7

The charge / discharge efficiency of the stack of the embodiment and the stack of the comparative example was tested under the above conditions. As a result, the current efficiency of each stack was measured in the same manner as in the case of [Table 1].

However, the voltage efficiency was found to be about 1.6% higher for the stack of the example compared to the stack of the comparative example, and the energy efficiency was about 1.4% higher for the stack of the example than the stack of the comparative example.

Here, when two stacks according to the comparative example were operated at the same time, the three cycle average efficiency was 68.6% and 68.7%, respectively. Also, after the operation is completed, the embodiment is applied to only one stack of two stacks, and these stacks are operated in three cycles, and energy efficiency is measured. As a result, the performance of one stack according to the comparative example is similar to the previous result, The change in energy efficiency as described above can be observed in one stack according to the embodiment.

6, which is a variation of the voltage efficiency, unlike the comparative example, as the electrolyte flows smoothly into the individual unit cells, the utilization ratio of the unit cells and the electrodes becomes higher, Which is higher than that of the comparative example.

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, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

10 ... unit cell 11 ... electrode flow frame
12 ... Euro channel 13 ... Membrane flow frame
21, 22 ... end plate 23 ... supply manifold hole
25 ... connection hole 29 ... exhaust manifold hole
30 ... supply through flow passage 50 ... discharge through flow passage
70 ... supply socket member 71 ... flow groove
73 ... outer diameter surface 75 ... closed surface
77 ... opposite face 79 ... ring groove
80 ... O-ring 90 ... exhaust socket member
91 ... Euro hole

Claims (11)

A redox flow cell stack including a plurality of unit cells continuously stacked including an electrode flow frame and a membrane flow frame, and both end plates disposed outermost of the unit cells,
A supply through-flow passage formed in the unit cells along the stacking direction and supplying the supply fluid to the electrode flow frame;
A supply manifold hole formed on one end plate and connected to one end of the supply through-flow passage;
A connection hole formed in the other end plate and connected to the other end of the supply through-flow path; And
A supply socket member fitted in the connection hole and closing the other end of the supply flow path, the supply socket member having a flow path groove connected to the other end of the supply flow path;
A redox flow cell stack. The method according to claim 1,
And a discharge through flow path formed separately from the supply flow path along the stacking direction in the unit cells and connected to the supply flow path through the flow channel of the electrode flow frame and discharging the supply fluid,
Wherein one end of the discharge passage is closed by the one end plate and an end manifold hole is formed in the end plate of the other end to be connected to the other end of the discharge passage. 3. The method of claim 2,
And a discharge socket member fitted in the discharge manifold hole and having a flow hole connected to the other end of the discharge through-flow passage. The method of claim 3,
Wherein the supply socket member and the discharge socket member are made of a metal,
Characterized in that it is made of any one plastic material selected from PE, PP, PVC, PVDP and PTFE having insulation and chemical resistance. The method according to claim 1,
Wherein the supply socket member comprises:
An outer diameter surface corresponding to an inner diameter surface of the connection hole, and a closing surface for closing the connection hole, and the flow path groove is formed on the opposite surface of the closing surface. The method according to claim 1,
Wherein the supply socket member comprises:
Wherein the thickness of the end plate is equal to or greater than the thickness of the end plate, and the thickness of the end plate is 100 to 500% of the thickness of the end plate. The method according to claim 1,
Wherein the inner diameter of the flow channel is 10 to 100% of the diameter of the supply through-flow passage. 8. The method of claim 7,
Wherein the depth of the flow path groove is 1 mm or more. 6. The method of claim 5,
Wherein the flow path groove has a tapered shape whose diameter gradually decreases toward the closed surface. 10. The method of claim 9,
Wherein the flow channel is formed to have a taper slope of 1 to 75 degrees. The method according to claim 1,
Characterized in that the supply socket member is provided with an o-ring.

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