KR20200098952A - Preparation method of parts for redox flow battery and redox flow battery including the same - Google Patents

Abstract

A method of manufacturing a component for a redox flow battery according to the present invention, which designs elements of the component, includes the steps of: designing to form a pattern of elements required for the component on each film or thin plate when dividing a component into a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the component; manufacturing elements according to the design; and stacking the manufactured elements. According to the method of manufacturing a component for a redox flow battery of the present invention, a plurality of elements are manufactured in the form of a film or a thin plate, and stacked and assembled, such that manufacturing time, production costs, and defect rate can be reduced. In addition, the thickness variation is small, so that the method can be easily applied to the automation process and thus mass production is possible.

Description

TECHNICAL FIELD The manufacturing method of a component for a redox flow battery, a redox flow battery including the same TECHNICAL FIELD [PREPARATION METHOD OF PARTS FOR REDOX FLOW BATTERY AND REDOX FLOW BATTERY INCLUDING THE SAME}

The present invention relates to a method for manufacturing a flow frame for a redox flow battery, a current collector frame, an end plate frame, and a bipolar plate frame, and a redox flow battery including the same.

The redox flow battery consists of a cell stack in charge of output, an electrolyte in charge of capacity, a pump for transferring the electrolyte, and peripheral devices. The cell stack is an important component that influences the performance of the redox flow battery system as a device that causes the redox reaction of the active material in the electrolyte during charging and discharging. As shown in FIG. 1, the cell stack includes a current collector 2a and 2b connected to an external conductor, a felt electrode 11 for causing a reaction, and a flow frame including a manifold serving as a flow of an electrolyte. It consists of a bipolar plate 21 that connects the unit cells electrically in series or in parallel and is in contact with the felt electrode 11, and a membrane 13 that is provided between the anode and the cathode and allows current to flow through the movement of ions. . In general, the bipolar plate 21 is fixed to the bipolar plate frame 22 as shown in FIG. 2 rather than being used alone. The bipolar plate frame 22 and the above-mentioned flow frame include an inlet and outlet of an electrolyte and a manifold flow path, to facilitate the flow of the electrolyte, to prevent the internal positive and negative electrolytes from being mixed, and to prevent the electrolyte from leaking to the outside. It should be well sealed. Since the thickness of the flow frame affects the compression rate of the felt electrode and is inversely proportional to the resistance characteristic of the cell stack, a technique for manufacturing a cell stack by optimizing the compression rate of the felt electrode is important.

Components such as a conventional flow frame and a bipolar plate frame are manufactured by an injection method, or a thick polymer plate (mainly PVC, PP, PE, etc.) as shown in FIG. 3 is engraved, NC (numerical control work), MCT, NCT, or It was processed using a numerical control lathe (CNC) or the like. The thickness of the flow frame is generally manufactured by engraving the flow path on a plate material thicker than the depth of the flow path, which is an electrolyte path, or by designing a mold to become an intaglio during injection. In processing manufacturing, if the total thickness of the plate is thicker than the desired thickness, the entire plate is cut to the desired thickness to control the thickness (controlling the compression rate). When manufacturing a flow frame or bipolar plate frame by processing it with an engraver, NC, MCT, NCT, CNC, etc. using a thick plate, thickness deviation and errors between frames occur, and it takes a long processing time, which is disadvantageous to mass production and high cost. to be. The flow frame or bipolar plate frame manufactured by the injection method has a disadvantage in that the frame is warped or bent, and to control the compression rate of the felt electrode, the process of remanufacturing an expensive injection mold and optimizing the injection process conditions is necessary. It is necessary, so it is time consuming and expensive.

The bending, curvature, and thickness deviation of the flow frame or bipolar plate frame manufactured as described above cannot provide a uniform flow of the electrolyte and adversely affect the reliability of the cell stack.

The flow frame or bipolar plate frame manufactured by the conventional method needs to solve problems such as warping, bending, thickness deviation, and high cost disadvantages, and it is necessary to easily control the compression rate of the felt electrode to improve the performance of the cell stack. In addition, it is necessary to develop a manufacturing technology for a flow frame and a bipolar plate frame capable of mass production.

Korean Patent Registration No. 10-1367035

The present invention manufactures a plurality of components in the form of a film or thin plate, and laminates and assembles a plurality of components in the form of a film or thin plate, unlike the existing method of manufacturing a component such as a flow frame, a current collector frame, or a bipolar plate frame by processing a thick plate, thereby manufacturing time, production cost, and An object of the present invention is to provide a method of manufacturing a component for a redox flow battery capable of mass production while reducing a defect rate.

In addition, an object of the present invention is to provide a redox flow battery with improved reliability and performance by applying a component manufactured by the above-mentioned method.

The object of the present invention is not limited to the object mentioned above. The object of the present invention will become more apparent from the following description, and will be realized by the means described in the claims and combinations thereof.

A method of manufacturing a component for a redox flow battery according to an embodiment of the present invention is a step of designing a component of the component, wherein the component is a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the component When dividing the part into, the step of designing to form a pattern of the constituent parts required for the part on each film or thin plate; Manufacturing a component according to the design; And stacking the manufactured components. Includes.

Here, the component may be selected from a flow frame, a bipolar plate frame, an end plate, and a current collector.

In the step of manufacturing the component, the component is not particularly limited, but may be manufactured using any one of cutting, laser processing, press mold, and injection processing using a film or a thin plate using a mold.

Each of the film or thin plate may be the same material or different materials.

In addition, at least one of the components may include at least one of a flow path, an electrolyte inlet and outlet, an electrode arrangement, and a through pattern for arrangement of a bipolar plate.

In the step of stacking the components, the number of components may be determined in consideration of at least one of a compressibility of an electrode, a volume of a flow path, and a difference between an electrochemical reaction rate between an anode and a cathode.

In addition, although not particularly limited, it is also possible to intimate contact between the components to be laminated using an adhesive, an adhesive film, fusion bonding or a gasket.

The stacking of the manufactured components comprises stacking and assembling a plurality of components having a penetration pattern in the same or different shape and size at the same or different positions to form a through structure or an intaglio structure required for the part. To do.

A redox flow battery according to another embodiment of the present invention includes a plurality of unit cells arranged in one direction, a bipolar plate provided between the plurality of unit cells, and each provided at both ends of the plurality of unit cells, and an electrolyte injection port and an outlet port A pair of end plates and a current collector each provided on the inner side of the pair of end plates, wherein the unit cell comprises a flow frame, a first electrode and a second electrode seated on the flow frame, and the first electrode and It includes a membrane provided between the second electrodes, wherein the flow frame is formed by stacking and assembling a plurality of films or thin plates having a through pattern formed at the same or different positions in the same or different shapes and sizes.

In this case, the plurality of films or thin plates may be formed of the same material or different materials.

In at least one of the plurality of films or thin plates, an opening in which the first electrode and the second electrode are seated and at least one through hole through which the electrolyte is introduced and discharged may be formed, and one area at the top and bottom of the opening A flow path portion extending from and bent may be provided.

The flow frame includes at least one or more first cover films and at least one second cover film provided to be spaced apart from each other, and at least one flow path film provided between the first cover film and the second cover film. In addition, at least one through-hole through which an electrolyte solution flows in and out is formed in the first cover film and the second cover film, and a flow path part may be provided in the flow path film in a through pattern.

The flow frame includes a first flow frame on which a first electrode is mounted and a second flow frame on which a second electrode is mounted, and thicknesses of the first flow frame and the second flow frame may be different from each other.

On the other hand, a bipolar plate frame for fixing the bipolar plate may be further included, wherein the bipolar plate frame is laminated and assembled with a plurality of films or thin plates having a penetration pattern formed in the same or different shape and size at the same or different positions Can be formed by

The film or thin plate of the bipolar plate frame may have a thickness equal to or thinner than that of the bipolar plate.

In addition, the bipolar plate frame includes a first'cover film and a second' cover film provided to be spaced apart from each other, and a first fixing film and a second fixing film provided between the first'cover film and the second' cover film. Including, the bipolar plate may be provided between the first fixing film and the second fixing film.

In addition, at least one of the current collector and the end plate may have a structure formed by stacking and assembling a plurality of films or thin plates having the same or different shapes and sizes in the same or different positions and having a penetration pattern formed thereon.

According to the manufacturing method of a component for a redox flow battery of the present invention, a plurality of components are manufactured in the form of a film or a thin plate, and by stacking and assembling them, manufacturing time, production cost, and defect rate can be reduced. There is an advantage that mass production is possible because it can be easily applied to the process.

In addition, since the redox flow battery component of the present invention is manufactured in a manner in which a plurality of films or thin plates are stacked, it is easy to change the design according to the compression rate of the electrode, and thus manufacturing time and cost can be reduced.

In addition, according to the redox flow battery of the present invention, there is an advantage in that reliability and performance are improved by applying a component manufactured by laminating a plurality of films or thin plates.

1 is a cross-sectional view showing the structure of a conventional redox flow battery.
2 is a partial cross-sectional view showing a portion of FIG. 1.
3 is a photograph showing a manufacturing process of a conventional flow frame and a bipolar plate frame.
4A is a process chart illustrating a method of manufacturing a flow frame for a redox flow battery according to an embodiment of the present invention, and FIG. 4B is a photograph showing a manufacturing process of a flow frame for a redox flow battery according to an embodiment of the present invention. to be.
5 is a schematic diagram showing the structure of a redox flow battery according to an embodiment of the present invention.
6 is a side view of FIG. 5.
7A and 7B are schematic diagrams showing a flow frame according to an embodiment of the present invention.
8A and 8B are schematic diagrams showing a flow frame according to an embodiment of the present invention.
9A and 9B are side views of FIGS. 8A and 8B.
10A to 10C are schematic diagrams showing the shapes of the cover film and the flow path film of the flow frame.
11 is a side view showing a bipolar plate frame according to an embodiment of the present invention.
12 is a view showing an embodiment in which the number of stacked films or thin plates constituting a flow frame and a bipolar plate frame is increased according to a change (increase) in thickness of an electrode and a bipolar plate according to an embodiment of the present invention. .

The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed contents may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The method for manufacturing a component for a redox flow battery of the present invention includes the steps of designing components of components such as a flow frame, a bipolar plate frame, an end plate, and a current collector, manufacturing the component according to the design, and the manufactured It consists of a configuration comprising the step of stacking the components.

Particularly, when the component is divided into a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the component, each film or thin plate may contain the component parts required for the component. There is a characteristic that the pattern is designed to be formed.

Hereinafter, as a specific embodiment, a method of manufacturing a flow frame for a redox flow battery according to the present invention will be described in detail with reference to the drawings.

4A is a process chart illustrating a method of manufacturing a flow frame for a redox flow battery according to an embodiment of the present invention, and FIG. 4B is a photograph showing a manufacturing process of a flow frame for a redox flow battery according to an embodiment of the present invention. to be.

Referring to FIG. 4, first, components of a flow frame are designed (S1).

When the flow frame is divided into a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the flow frame, a pattern of the components required for the flow frame is formed on each film or thin plate. It can be designed as possible. The flow frame can design components having various structures such as a shape in which a flow path is formed, a shape corresponding to a current collector, and a through hole, and in detail, the component includes at least one through hole through which an electrolyte is introduced and discharged. It is possible to design a constituent element having a shape corresponding to a cover film and a flow path film provided with a through-type pattern for forming a flow path. Components of the flow frame are not limited to a cover film and a flow path film.

Next, a component is manufactured according to the design (S2).

Since there is no particular limitation on the method of manufacturing the component, the component is manufactured using a method of cutting a film or thin plate using a mold according to design, laser processing, press mold, injection processing, etc. It can be manufactured in a way.

For example, after first processing a mold having a shape corresponding to each of the designed shapes such as a cover film and a flow film, which are constituents, the components, that is, a cover film and a flow film, respectively, on a material in the form of a film or thin plate. By positioning the corresponding mold and cutting it using a Thompson knife, it will be possible to manufacture components in the form of films or thin plates of various shapes. The step of manufacturing the component according to the design may be repeated a plurality of times for the same design according to the thickness and specifications of the flow frame required in the applied redox flow battery. The thickness of the flow frame may be determined in consideration of at least one of a compressibility of an electrode, a volume (depth and area) of a flow path, and a difference between an electrochemical reaction rate between an anode and a cathode. Such a plurality of films or thin plates may be the same material or different materials, and the materials include polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), polyacetal (POM), Polymethyl methacrylate (PMMA), polyurethane (PUR), polyethylene terephthalate (PET), polyamideimide (PAI), polyetherimide (PEI), polyamideimide (PAI), polyimide (PI), Polyphenylene sulfide (PPS), polyether ether ketone (PEEK), vinyl chloride resin (PVC), phenol resin (PF), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyphenylene Use one selected from oxide (PPO), polyphenylene ether (PPE), and combinations thereof, or purchase commercially available products such as polybenzoimidazole (PBI), electromagnetic wave shielding resin, MC-nylon, etc. It can be used, and metal-type plates such as aluminum and iron can also be used.

A specific material can be appropriately selected and applied according to the active material used in the redox flow battery. In addition, through the process of manufacturing a component according to the design, each component in which a flow path, an electrolyte inlet and outlet, and a through pattern for electrode arrangement may be formed on a film or thin plate may be manufactured.

Finally, the manufactured components are stacked (S3).

After selecting the compressibility of the electrode and the volume (depth and volume) of the flow path, a flow frame can be manufactured by stacking a plurality of each component in the form of a film or thin plate in consideration of this. For example, if the thickness of the electrode increases, The number of stacks can be increased proportionally. The flow frame may be formed by stacking and assembling a plurality of films or thin plates having various through patterns formed thereon so as to have a desired electrode compression rate and a channel depth and area. That is, in stacking the manufactured components, a through structure or an intaglio structure required for a flow frame is formed by stacking and assembling a plurality of films or thin plates having a through pattern in the same or different shape and size at the same or different positions. Make it possible.

Specifically, it may be formed by laminating a plurality of cover films and flow path films. Specifically, it is possible to manufacture a flow frame by sequentially stacking a cover film, a flow film, and a cover film in that order. In this case, the flow frame is preferably applied by adjusting the number of stacked sheets according to the compression rate of the electrode, and the number of stacking of the flow film Depending on the flow path depth and area may be adjustable. Each of the plurality of cover films and the flow path films may be the same material or different materials.

In addition, although not particularly limited, in order to closely bond between the laminated film or thin plate material, an adhesive or an adhesive film may be interposed therebetween, or a fusion bonding or a gasket may be used to closely adhere to each other.

When the step of laminating the components manufactured as described above is completed, the flow frame S4 is obtained.

Hereinafter, a method of manufacturing a bipolar plate frame for a redox flow battery according to an embodiment of the present invention will be described. Except for manufacturing a bipolar plate frame, since it is similar to FIGS. 4A and 4B related to manufacturing a flow frame, a redundant description will be omitted.

A method of manufacturing a bipolar plate frame for a redox flow battery according to an embodiment of the present invention includes designing components of a bipolar plate, manufacturing components according to the design, and stacking the manufactured components. Include. In this case, when the bipolar plate is divided into a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the bipolar plate, each film or thin plate may contain the components required for the bipolar plate. It is designed to form a pattern. In addition, various methods such as a method of cutting a film or a thin plate material using a mold according to design, laser processing, press mold, injection processing, etc. may be applied to the manufacture of the component, and there is no particular limitation thereto. In this case, the film or the thin plate may be the same material or different materials.

As described above, according to the manufacturing method of a flow frame or bipolar plate frame according to an embodiment of the present invention, manufacturing time and production cost by manufacturing a plurality of components in the form of a film or thin plate and stacking and assembling them according to desired specifications. And it is possible to reduce the defect rate, and the thickness deviation is small, so that it can be easily applied to an automated process, thereby enabling mass production. In addition, by manufacturing a flow frame or a bipolar plate frame in a manner in which a plurality of films or thin plates are stacked, it is easy to change the design according to the compression rate of the electrode, and thus manufacturing time and cost can be reduced.

In the above, the manufacturing method of the flow frame and the bipolar plate frame among the components of the redox flow battery has been described in detail, but for other components such as current collectors and end plates, a plurality of components are manufactured in the form of a film or thin plate and laminated and assembled. It will be clearly understood that it can be manufactured in such a way.

5 is a schematic diagram showing the structure of a redox flow battery of the present invention, and FIG. 6 is a side view of FIG. 5.

The redox flow battery 1000 of the present invention includes a plurality of unit cells 100 arranged in one direction, a bipolar plate 200 provided between the plurality of unit cells 100, and both ends of the plurality of unit cells 100, respectively. It is provided, and includes a pair of end plates (1a, 1b) having an electrolyte injection port and an outlet, and current collectors (2a, 2b) provided on the inner side of the pair of end plates (1a, 1b), respectively.

The unit cell 100 is provided between the flow frame 110, the first electrode 121 and the second electrode 122 seated on the flow frame 110, and the first electrode 121 and the second electrode 122 In this case, the flow frame 110 may have a structure formed by stacking and assembling a plurality of films or thin plates having a through pattern formed at the same or different positions in the same or different shapes and sizes.

As the first electrode 121 and the second electrode 122, carbon felt, carbon paper, or carbon cloth having pores may be used, and the anode or cathode electrolyte flows through the pores and is charged by redox reactions. And discharge can be made. Carbon felt that can be used as the first electrode 121 and the second electrode 122 mentioned above may have various densities, pores, and thicknesses, and may be appropriately selected according to the purpose or characteristics of the applied redox flow battery. Applicable. For example, when the porosity of the first electrode 121 or the second electrode 122 is too low or the thickness is too thick, the first and second cover films 111a and 111b or the flow path film of the flow frame 110 to be described later ( 115) is increased to reduce the compressibility of the first electrode 121 or the second electrode 122, thereby securing the flow stability of the electrolyte. On the other hand, when the electrochemical reaction rate of the first electrode and the second electrode is different depending on the active material and the thickness of the electrode needs to be adjusted, the film or thin plate constituting the flow frame on the first electrode side and the flow frame on the second electrode side is stacked. It can also be configured in different numbers.

The membrane 130 is an ion exchange membrane that is generally applied to a battery, and serves to selectively permeate ions, and by exchanging ions for charge balance through the membrane, a redox reaction between the positive electrode and the negative electrode can be performed. have. This membrane 130 is from the group consisting of polyolefin (PO), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polysulfone (PSF), polyimide (PI), and polyamideimide (PAI). Can be chosen.

The bipolar plate 200 is provided between the plurality of unit cells 100 to move the electrolyte and electrically connect the unit cells in series or in parallel, and can be formed in various thicknesses. Specifically, the structure of the applied redox flow battery Therefore, it is possible to change the design appropriately within the range of 0.1 to 5mm. A detailed structure of the bipolar plate 200 will be described in more detail below with reference to the drawings.

The end plates 1a and 1b may be provided on the outermost side as a pair, respectively, and an electrolyte injection port and a discharge port, which are passages through which the electrolyte is injected and discharged, may be formed. The electrolyte inlet and outlet are connected to the positive electrolyte tank and the negative electrolyte tank, and the positive electrolyte and the negative electrolyte may circulate by driving a separately provided pump. These end plates 1a and 1b may be selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), and vinyl chloride resin (PVC).

The current collectors 2a and 2b are made of a conductive material, and the conductive material may be any one of carbon, graphite, a conductive sheet, film, or metal.

A positive electrode electrolyte and a negative electrode electrolyte commonly used in a redox flow battery include an active material, a solvent, and an electrolyte, and the active material is dissociated in a solvent to cause a redox reaction, through which the redox flow battery may be charged and discharged.

7A and 7B are schematic diagrams showing a flow frame according to an embodiment of the present invention.

As shown in Figure 7, the flow frame 110 is formed by stacking a plurality of films or thin plate (111a, 111b, 115), at least one of the plurality of films or thin plate (111a, 111b, 115) The openings 112 and 116 in which the first electrode 121 or the second electrode 122 are seated, and at least one or more through-holes 113 through which the electrolyte flows in and out may be formed. In addition, referring to FIG. 7B, at least one film or thin plate 115 constituting the flow frame 110 is bent and extended from one region of the upper and lower ends of the opening 116 but formed in a through pattern. (117) can be provided. The volume of the flow path part 117 may be adjusted according to the number of layers of the film or thin plate 115 on which the flow path part 117 is formed or the thickness of the film or thin plate material.

Meanwhile, the flow frame 110 may include a first flow frame on which the first electrode 121 is mounted and a second flow frame on which the second electrode 122 is mounted, and due to the electrochemical reaction rate by the active material When the thicknesses of the first electrode 121 and the second electrode 122 are different, the thickness of the first flow frame and the second flow frame may be adjusted differently by adjusting the number of stacked films or thin plates. As an example, when zinc (Zn) and bromine (Br) are used as the first electrode 121 and the second electrode 122, the probability of causing an electrical short through the membrane due to the formation of metal on the first electrode 121 Therefore, the thickness of the first flow frame can be adjusted to be thicker than that of the second flow frame. The thickness control of the flow frame may be controlled by controlling the number or thickness of the film or thin plate constituting the flow frame.

Materials of the flow frame 110 include polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), polyacetal (POM), polymethyl methacrylate (PMMA), polyurethane ( PUR), polyethylene terephthalate (PET), polyamideimide (PAI), polyetherimide (PEI), polyamideimide (PAI), polyimide (PI), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), vinyl chloride resin (PVC), phenol resin (PF), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyphenylene oxide (PPO), polyphenylene ether (PPE) And one selected from a combination of these can be used, or commercially sold products such as polybenzoimidazole (PBI) electromagnetic wave shielding resin MC-nylon can be purchased and used, and metal types such as aluminum and iron can also be used. Can be used. It is preferable that the material of the flow frame 110 is appropriately adjusted and applied according to the type of active material or electrolyte used in the redox flow battery. For example, when the electrolyte is a strong acid or strong base, a polymer-based material with high chemical resistance is used, and when a redox couple other than a strong acid and strong base is used, a metal material may be used, and in the case of a vanadium redox flow battery General-purpose plastics or high-performance plastics can be used.

Hereinafter, a shape of a flow frame according to an embodiment of the present invention will be described with reference to FIGS. 8 to 10.

Figures 8a and 8b are schematic diagrams showing a flow frame according to an embodiment of the present invention, Figures 9a and 9b are side views of Figures 8a and 8b, Figures 10a to 10c are cover films and flow path films of the flow frame It is a schematic diagram showing the shape of.

8 and 9, the flow frame 110 includes a first cover film 111a and a second cover film 111b, a first cover film 111a and a second cover film 111b provided to be spaced apart from each other. ) It may include a flow path film 115 provided at least one sheet between. The first cover film 111a and the second cover film 111b may serve to prevent the flow path portion 117 of the flow path film 115 from being damaged from the bipolar plate 200. The thickness of the flow path film 115 may be formed to be relatively thicker than that of the first and second cover films 111a and 111b, but is not limited to the thickness shown in FIG. 9 and may be variously modified. . In addition, the number of stacking lengths of the flow path film 115 may be variously designed according to the optimum compression ratio of the first and second electrodes 121 and 122, and the thickness of the first and second electrodes 121 and 122 is thick. The number of sheets of the flow path film 115 may be proportionally increased.

In addition, between the first and second cover films 111a and 111b and the flow path film 115, a gasket portion for preventing leakage of electrolyte and a bonding portion for closely bonding a plurality of films may be provided. For example, at least one selected from soft vinyl chloride resin, hard vinyl chloride resin, and silicone may be used as the gasket part, or commercially sold products such as Viton O-ring may be purchased and used. At least one selected from a bonding tape, a double-sided bonding tape, and an adhesive may be used. Since the gasket portion and the bonding portion are to closely couple the plurality of films, the shape of the gasket portion and the bonding portion is not limited in this embodiment.

When the structure of the first cover film 111a and the second cover film 111b is described in more detail with reference to FIG. 10A, the first cover film 111a and the second cover film 111a and the second cover film ( At least one or more through holes 113 formed in 111b) may be formed in corner regions of the first cover film 111a and the second cover film 111b, respectively. When the structure of the flow path film 115 is described in more detail with reference to FIG. 10B, the flow path portion 117 extending from one area of the upper and lower ends of the opening 116 and bent is formed in the flow path film 115. The flow path portions 117 provided at the upper and lower ends of the opening 116 may be bent in different directions, but may be provided horizontally to each other. In addition, the volume, shape, and cross-sectional area of the flow path part 117 may be adjusted by the number of stacked flow path films 117. In addition, as shown in FIG. 10C, a pattern in which an opening 119 is formed in a shape corresponding to a current collector in the film 118 may be possible.

11 is a side view showing a bipolar plate frame according to an embodiment of the present invention.

Referring to FIG. 11, the redox flow battery of the present invention may further include a bipolar plate frame 300 for fixing the bipolar plate 200. The bipolar plate frame 300 may have a form in which a plurality of films or thin plates are stacked, and the thickness of the film or thin plate of the bipolar plate frame 300 may be the same as or thinner than the thickness of the bipolar plate 200. On the other hand, when the thickness of the bipolar plate 200 is increased, the thickness of the bipolar plate frame 300 is also increased in proportion to this so as to prevent leakage and leakage, and the number of films stacked thereon may also increase. 12 shows an example in which the number of stacked films or thin plates constituting the flow frame and the bipolar plate frame is increased according to the change (increase) of the thickness of the electrode and the bipolar plate according to an embodiment of the present invention.

On the other hand, in more detail, the bipolar plate frame 300 includes a first'cover film 311 and a second' cover film 312 and a first' cover film 311 and a second' cover film ( 312) may include a first fixing film 321 and a second fixing film 322 provided between. In addition, a bipolar plate 200 is provided between the first fixing film 321 and the second fixing film 322 so that it may be more closely fixed. In addition, an adhesive member may be provided between the second' cover film 312, the first' cover film 311, the first fixing film 321, or the second fixing film 322, but is not limited thereto.

In the above, the flow frame and bipolar plate frame manufactured by stacking components in the form of films or thin plates among the components of the redox flow battery have been exemplarily described, but other components such as current collectors and end plates have also been described. It goes without saying that the redox flow battery can be configured by adopting the one manufactured in the same manner.

The redox flow battery of the present invention configured as described above may improve reliability and performance by applying a component manufactured in a manner of laminating a plurality of films or thin plates, thereby reducing deviation due to processing errors.

Although the invention made by the present inventor has been described in detail according to the above embodiment, the invention is not limited to the above embodiment, and it goes without saying that the invention can be changed in various ways without departing from the gist thereof.

1000: redox flow cell
1a, 1b: end plate
2a, 2b: current collector
100: unit cell
110: flow frame
11, 121, 122: first electrode, second electrode
13, 130: membrane
21, 200: bipolar plate
22, 300: bipolar plate frame

Claims (17)

Designing a component of a component, wherein the component is divided into a combination of a plurality of films or thin plate shapes having a plane perpendicular to the thickness direction of the component, and the component is applied to each film or thin plate. Designed to form a pattern of the required constituent parts;
Manufacturing a component according to the design; And
The method of manufacturing a component for a redox flow battery comprising; stacking the manufactured components.
The method of claim 1,
The component is a flow frame, a bipolar plate frame, an end plate, a method of manufacturing a component for a redox flow battery selected from a current collector.
The method of claim 1,
The component is a method of manufacturing a component for a redox flow battery manufactured using any one of cutting, laser processing, press mold, and injection processing using a film or a thin plate material.
The method of claim 3,
The film or thin plate is a method of manufacturing a component for a redox flow battery each of the same material or different materials.
The method of claim 3,
At least one of the components is a method of manufacturing a component for a redox flow battery comprising at least one of a flow path, an electrolyte inlet and outlet, an electrode arrangement, and a through pattern for arrangement of a bipolar plate.
The method of claim 1,
The number of stacked components is determined in consideration of at least one of a compressibility of an electrode, a volume of a flow path, and a difference between an electrochemical reaction rate between a positive electrode and a negative electrode.
The method according to claim 1,
A method of manufacturing a component for a redox flow battery in which the laminated components are in close contact with each other using an adhesive, adhesive film, fusion bonding or gasket.
The method according to claim 1,
The stacking of the manufactured components may include stacking and assembling a plurality of components having a penetration pattern in the same or different shape and size at the same or different positions to form a penetration structure or an intaglio structure required for the component. A method of manufacturing a component for flow battery.
A plurality of unit cells arranged in one direction;
A bipolar plate provided between the plurality of unit cells;
A pair of end plates each provided at both ends of the plurality of unit cells and having an electrolyte injection port and an outlet port; And
Includes; a current collector each provided on the inner side of the pair of end plates,
The unit cell is
Flow frame;
A first electrode and a second electrode mounted on the flow frame; and
Including; a membrane provided between the first electrode and the second electrode,
The flow frame is a redox flow battery formed by stacking and assembling a plurality of films or thin plates having the same or different shapes and sizes in the same or different positions and having a through pattern formed thereon.
The method of claim 9,
Redox flow battery wherein the plurality of films or thin plates are formed of the same material or different materials, respectively.
The method of claim 9,
In at least one of the plurality of films or thin plates, an opening in which the first electrode and the second electrode are seated, at least one through hole through which an electrolyte is introduced and discharged, and a region extending from the top and bottom of the opening are formed to be bent. Redox flow battery in which at least one of the flow path portions is formed.
The method of claim 9,
The flow frame includes at least one or more first cover films and at least one or more second cover films provided to be spaced apart from each other, and
It includes at least one flow path film provided between the first cover film and the second cover film,
A redox flow battery in which at least one through-hole through which an electrolyte solution flows in and out is formed in the first cover film and the second cover film, and a flow path part is provided in the flow path film in a through pattern.
The method of claim 9,
The flow frame includes a first flow frame on which a first electrode is mounted and a second flow frame on which a second electrode is mounted,
Redox flow batteries having different thicknesses of the first flow frame and the second flow frame.
The method of claim 9,
Further comprising a bipolar plate frame for fixing the bipolar plate,
The bipolar plate frame is a redox flow battery formed by stacking and assembling a plurality of films or thin plates having the same or different shapes and sizes in the same or different positions and having through patterns formed therein.
The method of claim 14,
The film or thin plate of the bipolar plate frame has a thickness equal to or thinner than that of the bipolar plate.
The method of claim 14,
The bipolar plate frame includes a first'cover film and a second' cover film provided to be spaced apart from each other,
Including a first fixing film and a second fixing film provided between the first'cover film and the second' cover film,
The bipolar plate is a redox flow battery provided between the first fixing film and the second fixing film.
The method of claim 9,
At least one of the current collector and the end plate is a redox flow battery formed by stacking and assembling a plurality of films or thin plates having a penetration pattern formed at the same or different positions in the same or different shapes and sizes.

Images