KR20180091283A - Flowframe integrated bipolar plate assembly for redox flow battery and method of manufacturing the same and stack for redox flow battery including the same - Google Patents

Abstract

A flow frame integrated separation plate assembly for a redox flow cell which can enhance adhesion characteristics between a flow frame and a separation plate without deteriorating electrical conductivity or the like, a manufacturing method thereof, and a redox flow battery stack having the same. The flow frame integrated separation plate assembly for the redox flow battery according to the present invention comprises: a flow frame; a separation plate which is seated on the flow frame; and a joining member disposed between the flow frame and the separation plate, for joining the separation plate to the flow frame. The flow frame comprises a first base resin and inorganic filler, the separation plate comprises a second base resin and conductive powder, and the joining member comprises a third base and a plasticizer, wherein the first, second, and the third base resin are all the same resin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flow frame-integrated separator plate assembly for a redox flow battery, a manufacturing method thereof, and a stack for a redox flow battery having the redox flow plate-

The present invention relates to a flow frame integrated type separator assembly for a redox flow battery, a manufacturing method thereof, and a stack for a redox flow battery having the same, and more particularly, And a stack for a redox flow battery having the flow plate integrated plate assembly.

The redox flow battery is a secondary battery using the principle of storing electric energy in the electrolyte. It is applied to an energy storage system (ESS) because it is easy to increase capacity compared to other secondary batteries and is a cheap and safe system have. Such a redox flow cell is a main component including a separator plate, a flow frame, an electrode, and an ion conductive membrane.

At this time, the separator plays a role of transferring electrons to the electrodes, that is, the positive electrode and the negative electrode, and separating the positive electrode electrolyte (V ⁴⁺ , V ⁵⁺ ) and the negative electrode electrolyte (V ²⁺ , V ³⁺ ) . For this purpose, the separator is attached to the flow frame, and there is no gap between the separator and the flow frame so that the electrolyte does not leak to the outside.

In order to impart conductivity, the separator plate was made by mixing graphite powder and a base resin, and the flow frame was made of a single base resin material having excellent acid resistance. At this time, when the base resin of the separator plate and the base resin of the flow frame are different from each other, there is a problem that the gap between the separator plate and the flow frame is poor. In this case, when the electrolyte leaks through the gap between the separator and the flow frame, there is a problem in that the performance of the battery deteriorates with the safety problem.

In recent years, in order to solve such a problem, the base resin of the separator plate and the base resin of the flow frame are manufactured by applying the same resin, and then the separator plate and the flow frame are heated and pressed by a hot press to melt the resin Thereby solving the problem of leakage of the electrolytic solution.

However, when the separation plate and the flow frame are bonded to each other through such a method, the problem of leakage of the electrolyte due to securing the bonding force between the separation plate and the flow frame can be improved. However, The shape of the separator plate and the flow frame can not be kept constant since the plate must be heated at a temperature of about 140 ° C or higher. Here, since the flow frame has a micro-flow path through which the electrolyte flows, the shape of the flow frame must remain the same, but the shape of the flow frame is deformed due to heating at a temperature of 140 ° C or higher.

In addition, the separator plate arranges the graphite powder for ensuring excellent conductivity. However, there is a problem that the conductivity is deteriorated due to the disorder of the arrangement of the graphite powder when heated at high temperature.

A related prior art is Korean Patent Laid-Open Publication No. 10-2015-0009135 (published on Jan. 26, 2015), which discloses a redox flow battery stack including a separator plate assembly and a separator plate tab.

It is an object of the present invention to provide a flow frame integrated type separator plate assembly for a redox flow battery capable of improving a junction characteristic between a flow frame and a separator plate without deteriorating electrical conductivity and the like, a method for manufacturing the same, and a stack for a redox flow battery having the same .

According to an aspect of the present invention, there is provided a flow frame integrated type separator assembly for a redox flow battery, including: a flow frame; A separation plate that is seated on the flow frame; And a joining member disposed between the flow frame and the separating plate for joining the separating plate to the flow frame, wherein the flow frame includes a first base resin and an inorganic filler, A base resin and a conductive powder, wherein the bonding member includes a third base resin and a plasticizer, and the first, second, and third base resins are all the same resin.

According to an aspect of the present invention, there is provided a stack for a redox flow battery comprising: a flow frame integrated type separator assembly having at least two stacked layers; a plurality of electrodes inserted into the flow frame; And an ion conductive membrane interposed between the inserted flow frames.

According to an aspect of the present invention, there is provided a method of manufacturing a flow frame integrated type plate assembly for a redox flow battery, comprising the steps of: (a) providing a flow frame, a separation plate and a bonding member; (b) sequentially laminating a joining member and a separating plate on the flow frame; And (c) heating and pressing the flow frame, the joining member and the separating plate by a hot press to form the flow frame integrated separator plate assembly, wherein the flow frame includes a first base resin and an inorganic filler, Wherein the separating plate comprises a second base resin and a conductive powder, and the bonding member includes a third base resin and a plasticizer, and the first, second and third base resins are all the same resin.

The flow-frame-integrated separator plate assembly for a redox flow battery according to the present invention, a method of manufacturing the same, and a stack for a redox flow battery having the same have the same first, second and third base resins of a flow frame, The adhesive force between the flow frame and the separator plate can be improved by hot press bonding.

In addition, the flow frame-integrated separator plate assembly for a redox flow cell, the method of manufacturing the same, and the stack for a redox flow battery having the redox flow sheet assembly according to the present invention can be manufactured by joining a large amount of plasticizer to the third base resin, It is possible to lower the melting point of the flow frame and to bond the flow frame and the separating plate to each other through the joining member at a low temperature.

As a result, according to the present invention, a flow frame integrated type separator plate assembly for redox flow battery, a manufacturing method thereof, and a stack for a redox flow battery having the same are provided with a flow frame through a bonding member, It is possible to maintain the shape and electrical performance of the flow frame and the separator plate because only the joint member having a lower melting point can be melted by joining the flow frame and the separator plate with the joint member by adding a large amount of the plasticizer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled cross-sectional view illustrating a stack for redox flow cells according to an embodiment of the present invention; FIG.
2 is an exploded perspective view showing a unit cell of a stack for a redox flow battery according to an embodiment of the present invention.
3 is an exploded cross-sectional view of a flow frame integral type separator plate assembly for a redox flow battery according to an embodiment of the present invention.
4 is a process flow diagram illustrating a method of manufacturing a flow frame integral type separator plate assembly for a redox flow battery according to an embodiment of the present invention.
5 to 7 are sectional views of a process for manufacturing a flow frame integrated type separator plate assembly for a redox flow battery according to an embodiment of the present invention.
FIG. 8 is a graph showing the adhesion evaluation results of a flow frame integral type separator plate assembly for a redox flow cell manufactured according to Example 1. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a flow frame integrated type separator plate assembly for a redox flow battery according to a preferred embodiment of the present invention, a manufacturing method thereof, and a redox flow battery stack having the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded cross-sectional view illustrating a stack for a redox flow battery according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view illustrating a unit cell of a redox flow battery stack according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a stack 100 for a redox flow battery according to an embodiment of the present invention includes a flow frame integrated separator assembly 120 in which at least two stacked layers are stacked. In addition, the redox flow battery stack 100 according to the embodiment of the present invention may further include the electrode 140 and the ion conductive membrane 160.

The flow frame integral separator plate assembly 120 includes a flow frame 122, a separator plate 124, and a joining member 126.

The flow frame 122 has a rectangular frame structure by an opening (122c in Fig. 3) penetrating the center of the interior, and the separation plate 124 is seated in the step (122b in Fig. 3).

At this time, the plurality of flow frames 122 may be designed to have symmetrical structures mutually adjacent to each other. Although not shown in detail in the drawing, the flow frame 122 may have a flow path through which the electrolyte flows.

The separator 124 serves to transfer electrons to the electrodes 140, that is, the anodes 142 and the cathodes 144, as well as the anode electrolytic solution (V ⁴⁺ , V ⁵⁺ ) and the cathode electrolytic solution (V ²⁺ , V ^{3 +} ) To prevent mixing. This separating plate 124 is seated at the edge of the flow frame 122.

The joining member 126 is disposed between the flow frame 122 and the separation plate 124 to serve to bond the separation plate 124 to the flow frame 122.

A plurality of electrodes 140 are inserted into the flow frame 122. At this time, the plurality of electrodes 140 may include an anode 142 and a cathode 144. The electrode 140 may be formed of a carbon-based material such as carbon fiber, carbon felt, graphite fiber, or graphite felt, but is not limited thereto.

The ion conductive membrane 160 is interposed between the flow frames 122 into which the plurality of electrodes 140 are inserted. The ion conductive membrane 160 is attached between the flow frames 122 to prevent electrolyte from leaking.

3 is an exploded cross-sectional view of a flow frame integrated type separator plate assembly for a redox flow battery according to an embodiment of the present invention, and will be described in more detail with reference to FIG.

1 and 3, a flow frame integrated type separator assembly 120 for a redox flow battery according to an embodiment of the present invention includes a flow frame 122, a separation plate 124, and a bonding member 126 .

The flow frame 122 has a frame body 122a having an opening 122c penetrating the center of the interior thereof and a step 122 disposed at the edge of the opening 122c of the frame body 122a, 122b. The flow frame 122 has a rectangular frame structure by an opening 122c passing through an inner center thereof, and a separation plate 124 is seated on the step 122b.

Here, the flow frame 122 includes a first base resin and an inorganic filler, the separation plate 124 includes a second base resin and a conductive powder, and the bonding member 126 includes a third base resin and a plasticizer do. Particularly, the same resin is used for all of the first, second and third base resins.

As described above, the flow-frame-integrated separator plate assembly 120 for a redox flow battery according to the embodiment of the present invention includes the flow frame 122, the separator plate 124, and the first, second, and third By using the same base resin, adhesion between the flow frame 122 and the separator plate 124 can be improved by hot press bonding.

In addition, the flow-frame-integrated separator plate assembly 120 for a redox flow-type battery according to the embodiment of the present invention can be manufactured by using the joint member 126 in which a large amount of plasticizer is added to the third base resin, It is possible to lower the melting point and to bond the flow frame 122 and the separation plate 124 via the joining member 126 at a low temperature.

As a result, the flow-frame-integrated separator plate assembly 120 for redox flow cells according to the embodiment of the present invention is bonded to the flow frame 122 via the joint member 126 by hot- Only the bonding member 126 having a lower melting point due to the addition of a large amount of the plasticizer in the process can be melted so that the flow frame 122 and the separation plate 124 can be joined with the bonding member 126, It becomes possible to maintain the shape and electrical performance of the circuit board 124.

The flow frame 122 includes 95 to 99.5 wt% of the first base resin and 0.5 to 5.0 wt% of the inorganic filler. Here, as the first base resin, a thermoplastic resin having excellent acid resistance can be used. More specifically, the first base resin may include polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) polyvinyl chloride (PVC) and polystyrene (PS) may be used.

The inorganic filler is added to improve the moldability of the flow frame 122. As the inorganic filler, at least one selected from calcium carbonate, barium sulfate, magnesium hydroxide, aluminum hydroxide, aluminum silicate, talc, diatomaceous earth, magnesium silicate and the like may be used. When the amount of the inorganic filler to be added is less than 0.5 wt% of the total weight of the flow frame 122, it is difficult to exert the effect of adding the inorganic filler properly. On the contrary, when the addition amount of the inorganic filler exceeds 5.0 wt% of the total weight of the flow frame 122, the addition amount of the second base resin relatively decreases and the acid resistance may be lowered.

The separator 124 includes 10 to 60 wt% of the second base resin and 40 to 90 wt% of the conductive filler. If the addition amount of the conductive filler is less than 40 wt% of the total weight of the separator plate 124, it may be difficult to secure the electric conductivity. On the other hand, when the amount of the conductive filler added exceeds 90 wt% of the total weight of the separator plate 124, there is a problem that the formability is lowered.

Here, the second base resin may be a polyolefin such as polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), and polystyrene (PS).

Conductive fillers are added to improve electrical conductivity. The conductive filler may be at least one selected from the group consisting of graphite powder, carbon nanotube, graphene, carbon black and carbon powder. have.

The bonding member 126 includes 50 to 80 wt% of the third base resin and 20 to 50 wt% of the plasticizer.

The third base resin, like the first and second base resins, may be formed of a material such as polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), and polystyrene (PS).

The plasticizer is added to the joining member 126 in a large amount to lower the melting point. In this case, the melting point of the joining member 126 is lowered to 70 to 120 ° C by adding a plasticizer at 20 to 50 wt% of the total weight of the joining member 126.

Such a plasticizer is not particularly limited as long as it can lower the melting point of the resin. Examples of the plasticizer include phthalic acid esters, aliphatic dibasic acid esters, trimellate esters, aliphatic phosphoric acid esters, aromatic phosphoric acid esters, (Aromatic phosphoric acid ester), epoxy (epoxy), and glycol (glycol).

If the amount of the plasticizer to be added is less than 20 wt% of the total weight of the joint member 126, the addition amount is insufficient and it may be difficult to exhibit the above effect properly. On the contrary, when the addition amount of the plasticizer exceeds 50 wt% of the total weight of the joint member 126, the addition amount of the third base resin relatively decreases, which may act as a factor to lower the acid resistance, which is not preferable.

The flow frame integrated type separator assembly for a redox flow battery according to an embodiment of the present invention uses the same first, second, and third base resins of the flow frame, separator plate, and junction member, The adhesive strength between the flow frame and the separator plate can be improved during hot pressing.

In addition, according to the embodiment of the present invention, the flow frame-integrated separator plate assembly for a redox flow-type battery has a structure in which a large amount of plasticizer is added to the third base resin as a joining member to lower the melting point of the joining member, It becomes possible to connect the flow frame and the separator plate through the intermediary.

As a result, according to the embodiment of the present invention, the flow frame integrated type separator plate assembly for a redox flow battery is characterized in that, in a bonding step of bonding a separator plate to a flow frame via a bonding member, Only the member can be melted and bonded between the flow frame and the separating plate with the joining member, so that it becomes possible to maintain the shape and electrical performance of the flow frame and the separating plate.

Hereinafter, a method for manufacturing a flow frame integral type separator plate assembly for a redox flow battery according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a flowchart illustrating a method of manufacturing a flow frame integrated type separator plate assembly for a redox flow battery according to an exemplary embodiment of the present invention. FIGS. 5 to 7 are cross- Sectional view showing a manufacturing method of an assembly.

4, a method for manufacturing a flow frame integrated type plate assembly for a redox flow battery according to an embodiment of the present invention includes a component preparing step S210, a lamination step S220, and a hot pressing step S230 .

Arrange parts

4 and 5, in the component preparing step S210, the flow frame 122, the separation plate 124, and the bonding member 126 are provided.

In this case, the flow frame 122 may be manufactured by mixing 95 to 99.5 wt% of the first base resin and 0.5 to 5.0 wt% of the inorganic filler, and then molding the mixture at 150 to 220 DEG C by compression molding or injection molding have. Here, the flow frame 122 is formed together with a flow path (not shown) in the flow frame 122 during the process of manufacturing the flow frame 122 by the compression molding method or the injection molding method.

Here, as the first base resin, a thermoplastic resin having excellent acid resistance can be used. More specifically, the first base resin may include polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) polyvinyl chloride (PVC) and polystyrene (PS) may be used.

The inorganic filler is added to improve the moldability of the flow frame 122. As the inorganic filler, at least one selected from calcium carbonate, barium sulfate, magnesium hydroxide, aluminum hydroxide, aluminum silicate, talc, diatomaceous earth, magnesium silicate and the like may be used.

The separator 124 may be manufactured by mixing 10 to 60 wt% of the second base resin and 40 to 90 wt% of the conductive powder, followed by hot pressing with a hot press. At this time, it is preferable that the heat pressing is performed for 10 to 30 minutes at 150 to 220 ° C and 10 to 30 MPa.

The second base resin may be a polyolefin such as polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), and polystyrene (PS).

Conductive fillers are added to improve electrical conductivity. The conductive filler may be at least one selected from the group consisting of graphite powder, carbon nanotube, graphene, carbon black and carbon powder. have. If the addition amount of the conductive filler is less than 40 wt% of the total weight of the separator plate 124, it may be difficult to secure the electric conductivity. On the other hand, when the amount of the conductive filler added exceeds 90 wt% of the total weight of the separator plate 124, there is a problem that the formability is lowered.

The bonding member 126 includes 50 to 80 wt% of the third base resin and 20 to 50 wt% of the plasticizer. The third base resin may be the same as the first and second base resins.

At this time, the plasticizer is added to the bonding member 126 in a large amount to lower the melting point. In this case, the melting point of the joining member 126 is lowered to 70 to 120 ° C by adding a plasticizer at 20 to 50 wt% of the total weight of the joining member 126.

Such a plasticizer is not particularly limited as long as it can lower the melting point of the resin. Examples of the plasticizer include phthalic acid esters, aliphatic dibasic acid esters, trimellate esters, aliphatic phosphoric acid esters, aromatic phosphoric acid esters, (Aromatic phosphoric acid ester), epoxy (epoxy), and glycol (glycol).

If the amount of the plasticizer to be added is less than 20 wt% of the total weight of the joint member 126, the addition amount is insufficient and it may be difficult to exhibit the above effect properly. On the contrary, when the addition amount of the plasticizer exceeds 50 wt% of the total weight of the joint member 126, the addition amount of the third base resin relatively decreases, which may act as a factor to lower the acid resistance, which is not preferable.

Lamination

4 and 6, in the laminating step S220, the joining member 126 and the separating plate 124 are stacked on the flow frame 122 in order.

The flow frame 122 includes a frame body 122a having an opening 122c passing through an inner center thereof and a frame body 122b disposed at the edge of the opening 122c of the frame body 122a, And has a step 122b. The flow frame 122 has a square frame structure by an opening 122c passing through an inner center thereof, and a separation plate 124 is seated on the step 122b.

Hot press

4, 6 and 7, in the hot pressing step S230, the flow frame 122, the joining member 126, and the separating plate 124 are hot-pressed by press-bonding to form a flow frame- Assembly 120 is formed.

At this time, the hot press is preferably carried out for 5 to 20 minutes under the conditions of 70 to 120 DEG C and 0.1 to 2 MPa. In the present invention, the hot press process is performed at a temperature and a pressure which are considerably low, that is, 70 to 120 ° C. and 0.1 to 2 MPa. This is because, by using the bonding member 126 in which a large amount of plasticizer is added to the third base resin, (126).

In this step, when the hot press temperature is less than 70 占 폚 or the hot press time is less than 5 minutes, there is a fear that the joining member 126 is not sufficiently melted. On the contrary, when the hot press temperature exceeds 120 占 폚 or the hot press time exceeds 20 minutes, it can be a factor for raising only the manufacturing cost without increasing the effect, which is not economical.

When the hot press pressure is less than 0.1 MPa, sufficient pressure is not applied to the joint member 126 between the flow frame 122 and the separation plate 124, and the adhesion force may be lowered. Conversely, if the hot press pressure exceeds 2 MPa, excessive pressure may cause deformation of the flow frame 122 and the shape of the separator plate 124.

The flow-frame-integrated separator plate assembly for redox flow battery manufactured by the above-described processes (S210 to S230) uses the same first, second, and third base resins of the flow frame, separator plate, It is possible to improve the adhesive force between the flow frame and the separator plate by hot press bonding.

In addition, the flow frame integrated type separator assembly for a redox flow battery manufactured by the method according to an embodiment of the present invention uses a joint member having a large amount of a plasticizer added to the third base resin, thereby lowering the melting point of the junction member, It becomes possible to join the flow frame and the separating plate to each other via the joining member.

As a result, the flow frame integrated type separator assembly for a redox flow battery manufactured by the method according to an embodiment of the present invention can be manufactured by a method in which a flow plate is bonded to a flow frame via a bonding member, Only the joint member having a reduced point can be melted and bonded between the flow frame and the separator by the joint member, so that it becomes possible to maintain the shape and electrical performance of the flow frame and the separator.

Example

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

One. Flow frame  Manufacture of integral separator plate assembly

Example  One

A flow frame, a separation plate, and a joining member. At this time, 99wt% of polyvinyl chloride (PVC) and 1wt% of calcium carbonate were mixed as a flow frame, and a flow path was prepared by injection molding at 170 ° C. 84% by weight of graphite powder and 16% by weight of polyvinyl chloride (PVC) were mixed as a separator, followed by compression at 160 DEG C and 20 MPa for 20 minutes by hot pressing to prepare a plate. A film having a thickness of 50 탆 in which 70 wt% of polyvinyl chloride (PVC) and 30 wt% of a phthalate ester plasticizer were mixed was prepared as a bonding member.

Next, the bonding members and the separation plates were laminated in order on the flow frame, and then the flow frames, the bonding members and the separation plates were hot-pressed by hot press for 10 minutes under the conditions of 90 DEG C and 1 MPa to melt the bonding members, The frame and the separator plate were integrated to manufacture a flow frame integral separator plate assembly.

Example  2

A flow frame integral type separator plate assembly was manufactured in the same manner as in Example 1, except that the pressure-bonded thermocompression was performed by hot pressing at 80 DEG C and 1.5 MPa for 15 minutes.

Example  3

A flow frame integral type separator plate assembly was manufactured in the same manner as in Example 1, except that the pressure-bonded thermocompression product was hot-pressed for 8 minutes under the conditions of 100 占 폚 and 0.5 MPa.

Example  4

A flow frame integral type separator assembly was manufactured in the same manner as in Example 1, except that a film having a thickness of 70 탆 in which 60 wt% of polyvinyl chloride (PVC) and 40 wt% of phthalate ester plasticizer were mixed as a bonding member was used.

Comparative Example  One

A flow frame and a separator were provided. At this time, 99wt% of polyvinyl chloride (PVC) and 1wt% of calcium carbonate were mixed as a flow frame, and a flow path was prepared by injection molding at 170 ° C. 84% by weight of graphite powder and 16% by weight of polyvinyl chloride (PVC) were mixed as a separator, followed by compression at 160 DEG C and 20 MPa for 20 minutes by hot pressing to prepare a plate.

Next, after the separation plate was laminated on the flow frame, the flow frame and the separation plate were hot pressed for 20 minutes under the conditions of 160 DEG C and 20 MPa to integrate the flow frame and the separation plate to form a flow frame integral plate assembly .

Comparative Example  2

A flow frame integral type separator plate assembly was produced in the same manner as in Comparative Example 1, except that the pressure-bonded thermocompression was performed by hot pressing for 30 minutes at 170 占 폚 and 15 MPa.

2. Property evaluation

Table 1 shows the physical property evaluation results of the flow frame integrated type separator plate manufactured according to Examples 1 to 4 and Comparative Examples 1 and 2, and FIG. 8 is a graph showing the physical property evaluation results of the integrated flow frame for a redox flow battery FIG. 5 is a graph showing the evaluation results of adhesion to a separator plate assembly. FIG.

1) Surface electrical conductivity

The surface electrical conductivity of the separator was measured by the 4-point probe method.

2) Flexural strength

The bending strength of the separator was measured according to ASTM D 790.

3)

In order to measure the bonding force to the flow frame integral separator assembly, the flow frame integral separator assembly is turned upside down, and a load is applied downward from the central portion of the separator plate using UTM equipment, The load was measured. At this time, the bonding area between the flow frame and the separator plate was fixed at 7 cm ² .

[Table 1]

As shown in Table 1 and FIG. 8, in the case of the flow-frame-integrated separator plate assembly for redox flow battery manufactured according to Examples 1 to 4, the surface electrical conductivity of the separator plate Which is superior to the separator plate of the flow frame integrated type separator plate assembly for the doff-flow battery.

In addition, it was confirmed that the separable plate assembly with integrated flow-frame for redox flow battery manufactured according to Examples 1 to 4 exhibited excellent adhesion characteristics when the separator plate was separated from the flow frame at a maximum load of 800N or more.

On the other hand, in the case of the flow-frame integrated type separator plate for redox flow battery manufactured according to Comparative Examples 1 and 2, the maximum load was only 117 N and 121 N, which indicates that the bonding force is significantly lower than those of Examples 1 to 4.

On the basis of the above-mentioned experimental results, it was confirmed that, when a bonding member in which a large amount of plasticizer was added and heated and pressed by a hot press at low temperature like in the case of a flow frame integral plate assembly for redox flow battery manufactured according to Examples 1 to 4, Compared with the flow frame separator plate assembly for redox flow battery manufactured according to Examples 1 and 2, the separator plate had excellent electrical conductivity and was visually confirmed to be maintained in a flow path shape in the flow frame.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. These changes and modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.

100: redox flow battery stack
120: Flow frame integral type separator assembly
122: Flow frame
124: separation plate
126:
140: electrode
160: ion conductive membrane
S210: Component preparation step
S220:
S230: Hot press step

Claims (20)

Flow frame;
A separation plate that is seated on the flow frame; And
And a joining member disposed between the flow frame and the separating plate for joining the separating plate to the flow frame,
Wherein the flow frame comprises a first base resin and an inorganic filler,
Wherein the separator comprises a second base resin and a conductive powder,
Wherein the joining member comprises a third base resin and a plasticizer,
Wherein the first, second, and third base resins are all the same resin.
The method according to claim 1,
Each of the first, second, and third base resins
(PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC) and polystyrene polystyrene: PS). < RTI ID = 0.0 > A < / RTI >
The method according to claim 1,
The flow frame
A frame body having an opening passing through the center of the frame,
And a stepped portion disposed at the edge of the opening of the frame body for seating the separating plate.
The method according to claim 1,
The flow frame
95 to 99.5 wt% of the first base resin and 0.5 to 5.0 wt% of the inorganic filler.
5. The method of claim 4,
The inorganic filler
A flow frame integral plate assembly for a redox flow cell comprising at least one selected from calcium carbonate, barium sulfate, magnesium hydroxide, aluminum hydroxide, aluminum silicate, talc, diatomaceous earth and magnesium silicate.
The method according to claim 1,
The separation plate
10 to 60 wt% of the second base resin and 40 to 90 wt% of the conductive powder.
The method according to claim 6,
The conductive filler
Flow frame integral separation for redox flow cells comprising at least one selected from graphite powder, carbon nanotube, graphene, carbon black and carbon powder. Plate assembly.
The method according to claim 1,
The joining member
50 to 80 wt% of a third base resin and 20 to 50 wt% of a plasticizer.
9. The method of claim 8,
The plasticizer
Examples thereof include phthalic acid esters, aliphatic dibasic acid esters, trimellate esters, aliphatic phosphoric acid esters, aromatic phosphoric acid esters, ), An epoxy (Epoxy), and a glycol (Glycol).
A stack for a redox-flow battery in which at least two flow-frame-integrated separator plates according to any one of claims 1 to 9 are laminated.
11. The method of claim 10,
The redox flow battery stack
A plurality of electrodes inserted in the flow frame,
Further comprising an ion conductive membrane interposed between the flow frames into which the plurality of electrodes are inserted.
(a) providing a flow frame, a separation plate, and a joining member;
(b) sequentially laminating a joining member and a separating plate on the flow frame; And
(c) heating and pressing the flow frame, the joining member and the separating plate by hot press to form the flow frame integral separating plate assembly,
Wherein the flow frame comprises a first base resin and an inorganic filler,
Wherein the separator comprises a second base resin and a conductive powder,
Wherein the joining member comprises a third base resin and a plasticizer,
Wherein the first, second, and third base resins are all the same resin.
13. The method of claim 12,
In the step (a)
The flow frame
A first base resin in an amount of 95 to 99.5 wt% and an inorganic filler in an amount of 0.5 to 5.0 wt%, and then molded by compression molding or injection molding at 150 to 220 캜. A method of manufacturing a separator plate assembly.
13. The method of claim 12,
In the step (a)
The separation plate
A second base resin in an amount of 10 to 60 wt% and a conductive filler in an amount of 40 to 90 wt%, followed by hot pressing with a hot press.
15. The method of claim 14,
The hot-
Wherein the process is performed at a temperature of 150 to 220 DEG C and 10 to 30 MPa for 10 to 30 minutes.
13. The method of claim 12,
The joining member
A third base resin in an amount of 50 to 80 wt% and a plasticizer in an amount of 20 to 50 wt%.
17. The method of claim 16,
The joining member
And having a thickness of 10 to 100 탆.
13. The method of claim 12,
In the step (c)
The hot press
Wherein the heat treatment is carried out at 70 to 120 ° C and 0.1 to 2 MPa for 5 to 20 minutes.
13. The method of claim 12,
Each of the first, second, and third base resins
(PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC) and polystyrene polystyrene (PS)). < Desc / Clms Page number 19 >
13. The method of claim 12,
The plasticizer
Examples thereof include phthalic acid esters, aliphatic dibasic acid esters, trimellate esters, aliphatic phosphoric acid esters, aromatic phosphoric acid esters, ), Epoxy (Epoxy), and glycol (Glycol). The method for manufacturing a flow frame integrated type separator plate assembly for a redox flow battery includes:

Images