EP4186117A1

EP4186117A1 - Energy storage device, in particular a redox flow battery

Info

Publication number: EP4186117A1
Application number: EP21752503.9A
Authority: EP
Inventors: Jan GROSSE AUSTING; Arne GROSSE AUSTING
Original assignee: Vanevo GmbH
Current assignee: Vanevo GmbH
Priority date: 2020-07-23
Filing date: 2021-07-19
Publication date: 2023-05-31
Also published as: WO2022018033A1; DE102020119528A1; CN116134651A; US20230290983A1

Abstract

The invention relates to a component, in particular for a redox flow battery, having at least one cell, wherein: a cell is composed of two half-cells; each half-cell comprises at least one half-cell interior for receiving an electrolyte; at least one electrode and at least one membrane are assigned to each cell; and at least one electrode and at least one membrane are arranged so as to form a stack. According to the invention, at least one electrode and at least one membrane are at least partially connected in a fluid-tight manner. The invention also relates to a method for producing the component.

Description

Energy storage device, in particular redox flow battery

The invention relates to a component, in particular for a redox flow battery, with at least one cell, one cell being constructed from two half-cells, each half-cell having at least one half-cell interior for receiving an electrolyte, each cell having at least one electrode and at least one Membrane is associated and wherein at least one electrode and at least one membrane are stacked.

Components of the type mentioned at the outset are known and are used, for example, in redox flow batteries. Redox flow batteries are used in particular in stationary applications and are advantageous due to their long cycle life, non-flammability and independent scalability of performance and capacity. In redox flow batteries, the energy is stored in liquid electrolytes. For the storage or withdrawal process, i.e. charging and discharging the battery, the electrolytes circulate through cell stacks in which the conversion between electrical and chemical energy takes place. The cell stacks, also known as stacks, generally consist of a large number of individual cells electrically connected in series. A redox flow stack typically consists of 35 to 40 cells, with each cell consisting of components such as cell frames, electrodes, membranes and sealing elements arranged in between. the Components can be stacked on top of each other and pressed together.

Due to the arrangement of the sealing elements in particular, the assembly of the cell stack is very time-consuming and therefore expensive. The tightness of the cell stack, which must prevent the electrolytes from mixing within the cell stack, is of great importance and represents a major challenge. The cell stack must also be tight to the outside.

In the case of a non-positive assembly of cell stacks, all components must be stacked correctly and appropriately one on top of the other, with the seals in particular having to be placed precisely. In this case, the tolerances with regard to the thickness and/or the groove depths for sealing rings and other sealing elements must be observed during the production of the components used in order to ensure the tightness of the cell stack. For example, solid end plates can be used in the production of the cell stack, which can be used for screwing and sealing by means of a force fit.

Alternatively, components for redox flow batteries have been described in which the electrodes and membranes are each materially connected to the cell frame so that sealing elements can be dispensed with, for example by welding in DE 10 2013 107 516 A1 or by gluing in DE 102015 102 123 A1.

A disadvantage of the methods mentioned, however, is that when assembling the stack, a joining step, for example welding or gluing, always has to be carried out between a stacking step, so that the process is time-consuming. Furthermore, there are restrictions in the choice of material for welding, since not all elements made of all materials can be welded together. Furthermore, from DE 10 2016 004 027 A1 discloses a cell and a cell stack of a redox flow battery and a method for producing this cell stack. A cell of a redox flow battery has at least two cell frame elements, a membrane and two electrodes, with at least two cell frame elements, the membrane and the two electrodes enclosing two separate half-cell interiors. At least four separate channels are provided in the at least two cell frame elements in such a way that different electrolyte solutions can flow through the two cell interiors. With the exception of the at least four separate channels, the cell is designed to be liquid-tight. In one manufacturing method, the at least two cell frame elements, the electrodes and the membrane are placed in a cast housing and the gap between the cell frame elements, the two electrodes and the membrane are filled with a liquid casting medium, so that all of the components mentioned are cast together in a liquid-tight manner. A disadvantage of the potting concept is, for example, that the cell frame is part of the sealing concept and cell frames must therefore be used and there are material requirements with regard to the adhesion of the casting media to the cell frame.

In other common concepts according to the state of the art, a half-cell of a cell stack is sealed by forming a fluid-tight connection between the electrode and frame at least in sections and a fluid-tight connection between frame and membrane at least in sections. This is done, for example, by using sealing elements or by gluing or welding the electrode to the frame and the frame to the membrane. The cell frame is therefore part of the sealing concept.

Furthermore, the cell frames assume the task of defining the distance between the electrode and the membrane and thus the thickness of the cell To define the half-cell interior and thus the compression of the felt electrode, if a felt electrode is used.

In addition, according to the prior art, the electrolyte is supplied and discharged into and out of the flask cell interior via the cell frame, and the electrolyte supply line and the electrolyte discharge line are formed. Another challenge is the sealing between the individual elements of the cell stack to form a sealed electrolyte guide line.

According to the tasks described, requirements are placed on the cell frame, for example with regard to tolerances in production or with regard to material properties that are necessary for gluing or welding. Furthermore, additional requirements are placed on the design of the electrolyte supply line and the electrolyte disposal line as well as on the electrolyte feeds and drains. The cell frames are therefore often quite complex elements, the production of which can be demanding and therefore expensive.

The invention is based on the object of proposing a component, in particular for a redox flow battery, with which a time-efficient and cost-efficient construction of a sealed component for a redox flow battery is made possible

This object is achieved with a component having the features of patent claim 1 and by a method for preparing a component having the features of patent claim 15. Further developments and advantageous configurations are specified in the respective subclaims. In a component, in particular for a redox flow battery, with at least one cell, one cell being constructed from two half-cells, each half-cell having at least one half-cell interior for receiving an electrolyte, each cell being assigned at least one electrode and at least one membrane and wherein at least one electrode and at least one membrane are arranged stacked, it is essential to the invention that at least one electrode and at least one membrane are connected in a fluid-tight manner at least in sections. A component, in particular for a redox flow battery, has at least one cell, preferably a large number of cells, with at least one cell being made up of two half-cells. Each half-cell has at least one half-cell interior into which an electrolyte is introduced by means of an electrolyte inlet and is discharged by means of an electrolyte outlet. The half-cell interiors are each closed off in sections by at least one electrode and in each case at least one membrane. A porous, electrically conductive felt can be arranged in a half-cell interior, so that the surface area for the electrochemical reaction in the half-cell interior is enlarged. The electrodes and the membranes are of essentially flat design and have stacking surfaces as well as laterally surrounding side surfaces that delimit the stacking surfaces. The stacking surfaces of two components arranged one above the other in a cell stack, that is to say adjacently, face one another while the side surfaces face outwards. For example, the stacking areas can have a rectangular, in particular square, base area or a round, in particular circular, base area. Particularly in the case of membranes and electrodes with a rectangular base area, the side surfaces each span a plane, with the planes spanned by the side surfaces being arranged perpendicular to the planes spanned by the stacking surfaces. In the case of membranes and electrodes with round bases, the outer surface spanned by the side surfaces is arranged perpendicularly to the stacking surfaces. The at least one electrode and the at least one Membrane connected fluid-tight at least in sections with a fluid-tight connection. Due to the at least partially fluid-tight connection between the membrane and the electrode, a half-cell interior can be formed between the membrane and the electrode. The fluid-tight connection can be formed here, for example, between the mutually facing stacking surfaces of the electrode and the membrane. In particular, the fluid-tight connection can be formed in the region of the side edges of the stacking surfaces of the electrode and the membrane, which are arranged one above the other, in particular parallel to the side edges of the stacking surfaces, so that a half-cell interior space for accommodating the electrolyte is formed between the stacking surfaces and the peripheral fluid-tight connection. The fluid-tight connection can be formed, for example, by an integral connection, for example by an adhesive connection, a welded connection or the like. Furthermore, it is possible for a membrane and an electrode to be connected in a fluid-tight manner, at least in sections, on at least one outward-facing side surface, for sealing purposes and for forming a half-cell interior. A half-cell interior is formed here by the mutually facing stacking surfaces of the electrode and the membrane as well as the peripheral fluid-tight connection of the side surfaces of the electrode and the membrane. Due to the fluid-tight connection of the membrane to the electrode, it is not necessary to create a seal, in particular of the half-cell interiors, for example by arranging sealing elements and establishing a non-positive connection. Sealing elements such as sealing rings and their complex assembly can thus be dispensed with. A sealing of the electrode and the membrane is thus possible and advantageous without the inclusion of cell frames in the sealing concept. For this, the membrane and the electrode can be connected directly to one another in a fluid-tight manner. The cell frames do not have to take on any tasks for the formation of the fluid-tight connection. Cell frames, if they are used at all, only have the task of supplying electrolyte and Electrolyte removal and/or the task of forming an electrolyte supply line and/or an electrolyte disposal line or the task of a spacer between membrane and electrode. By reducing cell frame requirements with the ability to completely eliminate cell frames, costs can be reduced.

In one embodiment of the invention, at least one electrode and at least one membrane are each connected in a fluid-tight manner circumferentially at the sides at least in sections. For sealing purposes, the at least one electrode and the at least one membrane are connected in a fluid-tight manner, for example on at least one outwardly facing side surface, at least in sections. Furthermore, it is possible to establish a fluid-tight connection between the edge regions of the electrode and the membrane, in particular the edge regions of the stacking surfaces facing one another. The fluid-tight connection can, for example, take place in a material-to-material or non-positive manner. In particular, a half-cell interior is formed between the electrode and the membrane to accommodate an electrolyte. Due to the fluid-tight connection that runs all the way round at least in sections, it is not necessary to establish a non-positive connection between the components, for example by means of sealing elements, in order to ensure the tightness of the component. The fluid-tight connection of the side surfaces facing outwards makes it possible in a simple manner to seal the half-cell interiors of a redox flow battery without having to resort to additional sealing elements.

In a development of the invention, at least one electrode and at least one membrane are each peripherally connected to at least one side plate in a fluid-tight manner, at least in sections. A side plate can be a flat component. In particular, the side plate when using membranes and Electrodes with a rectangular base have approximately the same width as the side surfaces of the electrode and the membrane. When using membranes and electrodes with a round base, a side plate can be flexible, for example, so that the side plate can be wrapped around the side faces of the membranes and electrodes. In the case of rectangular membranes and electrodes, a side plate can be assigned to each side of the membranes or electrodes. In order to create a fluid-tight connection between the membrane and the electrode, these can be connected, for example, to at least one side plate on their outwardly facing side surfaces. A fluid-tight connection is produced between the side surfaces of the electrode and the membrane and the side plate, for example by means of a material connection, in particular by means of an adhesive connection. In this case, the plane spanned by the side plate is arranged approximately parallel to the plane spanned by the side surfaces of the electrode and the membrane. Furthermore, it is possible to produce a fluid-tight connection between the edge areas of the electrode and the membrane, in particular the edge areas of the mutually facing stacking surfaces and one or more side plates. The use of a side plate enables a particularly simple type of fluid-tight connection, since this can be attached to the side after the individual components have been stacked.

In a development of the invention, at least one fluid-tight connection is an integral connection. Fluid-tight connections, for example between an electrode and a membrane, in particular between the edge areas of the stacking surfaces and/or the side surfaces of an electrode and a membrane, or the side surfaces of an electrode, a membrane and a cell frame or also between an electrode, a membrane, a cell frame and a side plate, in particular between the side surfaces and a side plate, can be produced in a materially bonded manner. In one embodiment of the invention, the at least one electrode and the at least one membrane are directly connected to one another in a fluid-tight manner, the interior of the half-cell is closed off at least in sections by the fluid-tight connection and/or the at least one electrode and the at least one membrane are connected directly to at least one side plate in a fluid-tight manner and the half-cell interior is at least partially sealed in a fluid-tight manner by the fluid-tight connections. The direct connection of electrode and membrane is in contrast to an indirect connection of membrane and electrode involving a cell frame in the connection, ie the indirect connection of membrane and electrode takes place by directly connecting the membrane and the electrode to the same cell frame. Due to the direct fluid-tight connection of the membrane to the associated electrode, a fluid-tight sealed half-cell interior is formed. The fluid-tight connection between the membrane and the electrode can be interrupted by electrolyte supply lines and electrolyte discharge lines in order to be able to ensure the electrolyte exchange with the half-cell interior. Further sealing elements, such as rubber seals or the like, are not required for the fluid-tight sealing of the half-cell interior. In particular, cell frames do not fulfill any task of sealing the interior of the half-cell. The fluid-tight connection between membrane and electrode can also be achieved by completely dispensing with cell frames. Cell frames can nevertheless be provided and used, for example, as spacers between the membrane and the electrode to set a defined distance between the membrane and the electrode. Cell frames can also be used to specify the distribution of the electrolytes in the half-cell interior by means of channel structures located in the frame. For example, the electrode and the membrane can overlap the cell frame laterally for this purpose, so that the cell frame is surrounded laterally by the fluid-tight connection between the membrane and the electrode. The fluid-tight connection between membrane and electrode can, for example, by an adhesive can be achieved that connects the membrane directly to the electrode. However, other processes for producing the fluid-tight connection are also possible. The direct fluid-tight connection prevents an electrolyte from getting from one half-cell interior, for example, into the adjacent half-cell interior. A very cost-effective method of sealing is created by sealing the interior of the half-cell through the direct fluid-tight connection of membranes and electrodes. Furthermore, it can be provided that the electrodes and membranes are directly connected in a fluid-tight manner to laterally arranged side plates. In this case, the fluid-tight sealing of the half-cell interiors would be provided by the respective direct fluid-tight connection of the membranes and electrodes to the respective side plates. Here, too, there are no sealing requirements for the cell frames or other components. However, cell frames can be provided, for example as spacers or the like. As a result, low demands are placed on the material properties of the cell frames, since they do not have to be glued to other components to produce fluid-tight connections, for example.

In one embodiment of the invention, at least one at least partially fluid-tight semi-cell interior is formed between the at least one electrode, the at least one membrane and the fluid-tight connection between the membrane and the electrode and/or at least one at least partially fluid-tight semi-cell interior is between the at least one membrane, the formed at least one electrode and the fluid-tight connections of the membrane and the electrode to at least one side plate. Semi-cell interiors that are sealed off in a fluid-tight manner are necessary in the cell stack so that no electrolyte can get from one semi-cell interior into an adjacent semi-cell interior. The formation of at least partially fluid-tight half-cell interior can thus, for example, solely by the membrane, the electrode, and the direct fluid-tight connection between the membrane and the electrode done. The fluid-tight connection between the membrane and the electrode can be interrupted by electrolyte supply lines and electrolyte discharge lines in order to be able to ensure the electrolyte exchange with the half-cell interior. Additional components are not required to form the half-cell interior. In particular, cell frames can be arranged, for example, as spacers or the like in the half-cell interior, but they do not contribute to the sealing effect. It is also possible for a half-cell interior to be formed between the electrode, the membrane, the side plates assigned to the electrode and the membrane and the direct fluid-tight connections of the membrane to the side plates and the electrode to the side plates. The fluid-tight half-cell interior thus results solely from these components and their fluid-tight connection.

In a development of the invention, at least one material connection is an adhesive connection. Cohesive connections, for example between a membrane and an electrode, in particular between the edge areas of the stacking surfaces and/or the side surfaces of an electrode and a membrane, or also between a membrane, an electrode, a cell frame and a side plate, in particular between the side surfaces of the components and a side panel, can be easily produced by adhesive connections. For example, the adhesive to be used can be applied to a side plate and thus the fluid-tight adhesive connection between the side plate and the edge areas of the electrode and the membrane, in particular the edge areas of the stacking surfaces facing one another and/or the side surfaces of the components, can be produced in a very time-efficient manner will.

In one embodiment of the invention, at least one material connection is a welded connection. The components can be connected in a fluid-tight manner by welding. This enables particularly secure and precise fluid-tight connections between the components or also between the components and the side plates.

In one development of the invention, at least one half-cell has at least one cell frame and at least one cell frame is stacked with at least one membrane and with at least one electrode. The cell frame is a frame-shaped component which, at least in sections, surrounds a cavity, in particular for accommodating an electrolyte. A possible arrangement can therefore consist of the sequence of the electrode, the cell frame and the membrane. The typical structure of a cell consisting of two half-cells would be, for example, an electrode followed by a cell frame filled with a first electrolyte, a membrane, followed by a second cell frame with a second electrolyte, followed by a further electrode. The fluid-tight sealing of the half-cell can be ensured by the fluid-tight connection of the electrode and the membrane, so that the cell frame serves as a spacer between the membrane and the electrode and ensures the task of electrolyte supply and electrolyte discharge. The base area of the membrane and the base area of the electrode, that is to say the stacking areas, can project laterally beyond the base area of the cell frame. In contrast to the prior art, the cell frame does not have the property that it is part of the sealing concept; in particular, the cell frame is not integrated in the fluid-tight connection between the electrode and the membrane. In one embodiment, the cell frame can have lateral projections that protrude beyond the base areas of the membrane and the electrode. In the stacked sequence of the membrane, the cell frame and the electrode, the lateral projections can protrude beyond the edges of the membranes and the electrodes. Line structures can be formed in the lateral projections, through which the electrolyte supply and the electrolyte discharge for the half-cell interior can be formed. The fluid-tight connection of the half-cell interior is thus formed in sections by the direct fluid-tight connection of the side areas of the membranes and the electrodes. In the areas where the lateral overhang of the cell frames with the electrolyte inlets and outlets protrudes beyond the edge areas of the membranes and the electrodes, there is no direct fluid-tight connection between the membrane and the electrode and this is also not required for correct functioning. Each cell frame has two projections, one for the electrolyte supply and one for the electrolyte drain. The overhangs of the cell frames of two adjacent half-cells are arranged offset to one another, so that, for example, the overhangs with electrolyte feeds of every second half-cell in a cell stack are arranged essentially congruently in a plan view. An electrolyte line element is arranged over the lateral projections of the frame elements arranged one above the other in a stacked arrangement, ie in a cell stack. The electrolyte feeds for several half-cells of the same polarity are supplied with electrolyte via an electrolyte line element. Correspondingly, the electrolyte is discharged via a further electrolyte line element, which combines the electrolyte discharges of several half-cells of the same polarity. The electrolyte line elements can each be arranged over the electrolyte feed or the electrolyte outlets of all half-cells in a stack or only over a certain number of half-cells to reduce short-circuit currents. The electrolyte line elements can be essentially housing-shaped and slipped over the lateral projections of the cell frames. The edges of the electrolyte line elements are sealed with the fluid-tight connections of the membranes and electrodes. Thus, the electrolyte cannot leak out of the electrolyte conducting element.

In a further development of the invention, at least one electrode, at least one membrane and at least one cell frame are each laterally connected in a fluid-tight manner to at least one side surface facing outwards. In a possible layer sequence A membrane, a cell frame and an electrode can be arranged in a stacked manner, it being possible for the electrode, the cell frame and the membrane to be connected in a fluid-tight manner at their side surfaces. The connection of the outwardly facing side surfaces achieves a fluid-tight closure of a half-cell, in particular of the half-cell interior, or of an entire cell stack in the case of a plurality of consecutive components.

In a development of the invention, at least one electrode, at least one membrane and at least one cell frame are each laterally connected to at least one side plate in a fluid-tight manner on at least one side surface facing outwards. The component sequence of a half-cell, for example consisting of an electrode, a cell frame and a membrane, wherein an electrode and a membrane can be assigned to two half-cells, can be connected to one another in a fluid-tight manner by attaching a side plate. The electrodes, cell frames and membranes stacked on top of one another are connected in a fluid-tight manner to at least one side plate on the side surfaces facing outwards. In particular, the membranes, the electrodes and the cell frames of a cell stack can each be connected to a side plate in a fluid-tight manner with their four side surfaces. For example, an integral connection between a side plate and the stacked components, ie the membranes, the cell frame and the electrodes, can be produced. The use of side plates, in particular on the four side surfaces of the components, creates a time-efficient, fluid-tight connection of the components in a simple manner.

In one embodiment of the invention, at least one electrode, at least one cell frame and at least one membrane are each laterally connected in a fluid-tight manner on four side faces to a side plate at least in sections. At least one electrode, at least one cell frame and at least one membrane with a rectangular base The stacked components of a cell stack, preferably all components of a cell stack, are laterally connected in a fluid-tight manner to a side plate on their four side surfaces, which each delimit the quadrangular stack surface. A cell stack can thus have four side plates, it being possible for two side plates arranged adjacent to each other to form an angle of approximately 90°. Four side plates, which are connected to the side surfaces of the components, can thus result in a complete fluid-tight sealing of the cell stack.

In a further development of the invention, at least one electrolyte inlet and/or at least one electrolyte outlet is assigned to at least one half-cell interior and at least one electrolyte inlet and/or at least one electrolyte outlet is formed through at least one opening in at least one fluid-tight connection formed between at least one membrane and at least one electrode . Cells can consist of two half-cells, each half-cell having a half-cell interior for receiving an electrolyte. In order to ensure that the electrolyte flows through the half-cell interior, a half-cell has an electrolyte inlet and an electrolyte outlet. The electrolyte feeds or electrolyte discharges can be connected to electrolyte lines that lead to an electrolyte supply, ie an electrolyte reservoir. Between a membrane and an electrode, for example between the edge regions of the mutually facing stacked surfaces of the membrane and the electrode, a fluid-tight connection is formed which at least partially encircles the interior of the half-cell. In particular, for example, an integral connection between the membrane and the electrode can be produced and thus a half-cell inner space can be formed between the membrane and the electrode. The electrolyte feeds and the electrolyte discharges can be formed in particular by openings or cavities in the fluid-tight connection of the membranes and the electrodes. The electrolyte supply or the electrolyte discharge can pass through the cavities the half-cell interior must be guaranteed. This enables the half-cell interiors of the half-cells to be supplied with electrolyte in a particularly simple manner. For example, the fluid-tight connection can be formed by an adhesive connection. Here, the electrolyte supplies and electrolyte discharges can be formed by cavities in the volume of adhesive material.

In one development of the invention, a half-cell has at least one electrolyte inlet and/or one electrolyte outlet, and at least one electrolyte inlet and/or at least one electrolyte outlet is formed at least in sections by at least one cavity in a cell frame and a passage opening arranged laterally in a cell frame. The cell frames of a half-cell can at least partially form the half-cell interior of the half-cell, in which the electrolyte is received, the fluid-tight sealing of the half-cell interiors being able to take place through the fluid-tight connection of the membrane to the electrode. In order to enable the electrolyte to circulate, a cell frame has lateral passage openings which are connected to the interior of the cell frame, the half-cell interior, through a hollow space in the cell frame. Electrolyte can be conducted through the half-cell interiors through the cavities in the cell frame and the passage openings. The passage openings and the cavities in the cell frame are aligned in such a way that a fluid flow through the cavities in the cell frame and the openings of the fluid-tight connection between the membrane and the electrode is made possible. Thus, an electrolyte can get into the half-cell interior through the opening in the fluid-tight connection and the cavity in the cell frame.

In a further development of the invention, the cavity narrows starting from the width of the half-cell interior in the direction of the lateral passage opening. A cell frame of a half-cell can be constructed in the form of a frame and partially surround a half-cell interior. In particular is the Half-cell interior partially limited by the inner sides of the cell frame, ie the inward-facing side surfaces of the frame. The cavity, through which the electrolyte inlets or electrolyte outlets are formed in sections, narrows from the width of the half-cell interior in the direction of the passage openings arranged on the outer side surfaces. In particular, the cavities of a cell frame, one of which forms the electrolyte feed in sections and one of which forms the electrolyte discharge in sections, can be arranged in frame sections of the cell frame arranged parallel to one another. The cavities of the electrolyte feed and the electrolyte discharge each narrow in the direction of the outwardly directed side surfaces. The cavities are thus formed in a funnel shape, at least in sections, with the funnel openings being arranged facing one another. The widening or narrowing of the cavities starting from the passage openings enables the electrolyte to flow efficiently through the interior of the half-cell.

In one embodiment of the invention, at least one half-cell has at least one electrolyte inlet and/or at least one electrolyte outlet, a cell frame is formed by at least two cell frame elements and at least one electrolyte inlet and/or at least one electrolyte outlet is at least partially through at least one free space between at least two cell frame elements educated. A cell frame of a half-cell can be formed by cell frame elements. A cell frame can thus be designed in particular in two parts. A cell frame element can have at least one frame leg and at least one leg section arranged at right angles thereto. For example, a cell frame element can be L-shaped, with a right angle being spanned between a frame leg and a frame leg section. To form a cell frame, two such cell frame elements can be arranged, for example, in such a way that the frame legs are parallel to one another are arranged and the leg sections are arranged parallel to one another, so that, for example, a rectangular shape of the cell frame can result. There can be a free space between a leg section of one cell frame element and a frame leg of the other cell frame element, so that the cell frame elements do not touch. Through the free space between the cell frame elements, an electrolyte feed or an electrolyte discharge can be formed in sections. Through the free space between the cell frame elements, an electrolyte can be introduced into the interior of the flask cell and discharged again. The free spaces are aligned in such a way that an electrolyte flow through the opening in the fluid-tight connection between the membrane and the electrode into the flask cell interior is possible. The leg sections can be designed in such a way that the free space between the cell frame elements is designed funnel-shaped in sections, so that the electrolyte feed or electrolyte discharge formed by the free space widens in the direction of the flask cell interior. The formation of the electrolyte feeds or electrolyte discharges through a free space between the cell frame elements enables the circulation of an electrolyte through the flask cell interior in a particularly simple manner.

In one development of the invention, at least one half-cell has at least one electrolyte inlet and/or at least one electrolyte outlet and at least one electrolyte outlet and at least one electrolyte inlet is formed by at least one passage opening in at least one side plate. A half-cell preferably has an electrolyte inlet and an electrolyte outlet. The electrolyte supply and the electrolyte discharge allow the electrolyte to circulate through the half-cell interior of the half-cell. The membranes and electrodes of a half cell or a cell can be connected laterally to a side plate on their outwardly facing side surfaces. In order to supply or discharge electrolyte ensure the side plate can have passage openings through which the electrolyte can get into the half-cell interior. For example, the passage openings of the side plates can be connected to feed lines or discharge lines for the electrolyte.

In a further development of the invention, at least one electrolyte feed is connected to at least one electrolyte feed line and at least one electrolyte discharge is connected to at least one electrolyte discharge line, and at least one electrolyte feed line and/or at least one electrolyte discharge line runs outside the stacking surfaces of the electrode and/or the stacking surface of the membrane and/or the Stacking surfaces of the cell frames. Each half-cell preferably has an electrolyte inlet and an electrolyte outlet in order to enable the electrolyte to be conducted through the interior of the half-cell. The electrolyte supplies of the half-cells are connected to electrolyte supply lines, the electrolyte discharges of the half-cells are connected to electrolyte discharge lines. Through the electrolyte supply lines and electrolyte discharge lines, the half-cell interiors are each connected to an electrolyte reservoir via the electrolyte feeds and electrolyte discharges. It is possible to implement the formation of electrolyte supply lines and/or disposal lines outside of the cell frame and thus further reduce the demands on the cell frame and simplify the process of producing the fluid-tight connections. The electrolyte supply lines or electrolyte discharge lines are arranged in such a way that they run outside the stacking surfaces of the membrane and/or the electrode and/or the cell frame. The electrolyte lines therefore do not intersect the outer side surfaces of the membrane, the electrode or the cell frame running perpendicularly to the stacking surfaces, or the plane spanned by the side surfaces. For example, the electrolyte supply lines and electrolyte discharge lines can be hose lines that can be arranged outside the stacking areas. By arranging the and discharge lines outside the stacking areas is a particularly simple construction of a redox flow battery and thus enables particularly simple assembly, since the formation of the electrolyte supply line and electrolyte discharge line does not take place through the stacked cell frame. Thus, the electrolyte supply line and electrolyte discharge line can be formed separately in terms of time and function from the formation of the fluid-tight connection between membrane and electrode

In a development of the invention, at least one electrolyte supply line and/or at least one electrolyte discharge line is formed through at least one cavity in at least one side plate. The membranes and electrodes of a cell, or the membranes, the electrodes and the cell frames of a cell can be connected to a side plate in a fluid-tight manner circumferentially, for example laterally, on their outwardly pointing side surfaces. In order to enable fluid flow between the half-cell interiors, electrolyte supply lines and/or electrolyte discharge lines, which connect the electrolyte supply lines and electrolyte discharge lines of the half-cell to one another, can be formed by cavities in the side plates. In particular, the side plates can each have inner channels positioned for connection to the electrolyte feed and discharge, so that there is a fluid-tight connection to the outside. Furthermore, the side plates can have open channels, in particular grooves, pockets or the like, on their inwardly facing side surfaces, ie on the side surfaces connected to the side surfaces of the membranes and electrodes, which can serve as supply lines and discharge lines. In this case, the supply and discharge lines are formed in sections by the side plates and in sections by the side surfaces of the membranes and electrodes. By forming the electrolyte supply lines and electrolyte discharge lines through the side plates is a very allows time-efficient and cost-effective assembly of the electrolyte supply lines and electrolyte discharge lines.

In one embodiment of the invention, at least one electrolyte supply line and/or at least one electrolyte discharge line is arranged outside of the side plates. The electrolyte feeds and discharges can be formed by passage openings in the side plates. The passage openings in the side plates can be connected, for example, by hose lines, so that the electrolyte feeds and discharges are particularly easy to assemble.

In one embodiment of the invention, at least one cell frame has at least one electrolyte inlet and/or at least one electrolyte outlet and at least one cell frame forms at least one electrolyte inlet line and/or at least one electrolyte outlet line at least in sections and the at least one electrolyte inlet and/or the at least one Electrolyte discharge is fluid-tightly connected to the electrolyte supply line and/or to the electrolyte discharge line. The half-cell interior of a half-cell can be formed in sections from the insides of a cell frame, the half-cell interior being closed at the top and bottom by a membrane and an electrode. In order to enable the half-cell interior to be supplied with an electrolyte, the cell frame has at least one electrolyte inlet and/or one electrolyte outlet. The electrolyte inlets and outlets can be formed by openings, in particular on the inside, that is to say on the side of the cell frame elements which faces the half-cell interior. Electrolyte supply lines and electrolyte discharge lines are respectively connected to the electrolyte supply lines and electrolyte discharge lines. The electrolyte guide lines can be formed by cavities in the cell frame. In particular, the electrolyte guide lines through cavities, in particular through closed channels, which extend perpendicularly to the stacking surface of the cell frame element. Since the membranes and electrodes protrude laterally beyond the cell frame and the fluid-tight sealing of the half-cell interiors is achieved by connecting the membranes and electrodes to one another, appropriate openings are provided in the membranes and electrodes to form the electrolyte lines. Due to the stacked arrangement of the frame elements, the membranes and the electrodes and the congruent arrangement of the openings provided for the electrolyte supply lines, an electrolyte supply line extending over an entire cell stack can be formed. The fluid-tight connection of the membrane and the electrode can be made here, for example, by a circumferential fluid-tight connection on the side surfaces of the membrane and the electrode. Furthermore, the fluid-tight connection of the side faces to the side plates can also be provided, so that a cell stack composed of the components is closed off fluid-tight to the outside. Fluid-tight connections must also be made between the openings in the cell frames, membranes and electrodes, so that a sealed electrolyte guide line is formed. This sealing can be done, for example, with O-rings or similar sealing materials.

Another aspect of the invention relates to a method for producing at least one component, in particular for a redox flow battery, with at least one cell, one cell being constructed from two half-cells, each half-cell having at least one half-cell interior for receiving an electrolyte, wherein each cell is assigned at least one electrode and at least one membrane and wherein the electrodes and at least one membrane are arranged stacked, in which it is essential to the invention that at least one electrode and at least one membrane are connected in a fluid-tight manner. To produce a component for a redox flow battery, in particular for producing a cell stack of a redox flow battery, electrodes and Membranes stacked into half-cells. Each half-cell has a half-cell interior that can be formed at least in sections between an electrode and a membrane. To produce a cell stack, electrodes and membranes are stacked and the electrodes and membranes are connected in a fluid-tight manner at least in sections. Due to the fluid-tight connection of the electrodes and the membranes, in particular in the edge areas of the electrodes and membranes, a half-cell interior can be formed. In particular, a half-cell interior is formed at least in sections by the mutually facing stacking surfaces of the electrode and the membrane and by the fluid-tight connection between the membrane and the electrode. The fluid-tight connection can be established, for example, between the edge regions of the stack surfaces facing one another. In particular, the fluid-tight connection can be arranged parallel to the edge regions of the stacking surfaces, so that a half-cell interior is formed by the stacking surfaces facing one another and the peripheral fluid-tight connection. Furthermore, it is possible for the fluid-tight connection to be formed between the outward-facing side surfaces of the membrane and the electrode. A fluid-tight connection can be formed between all the membranes and electrodes of a cell stack in a connected step after the elements of a cell stack have been stacked. It is therefore not necessary to insert a sealing element between each stacking step and/or to carry out a joining process (for example welding). As a result of the invention, the production of cell stacks can thus be carried out more easily and more quickly and thus more cost-effectively.

In a further development of the method, at least one electrode and at least one membrane are connected to one another in a fluid-tight manner, at least in sections, in each case laterally circumferentially. The electrodes and the membranes are of essentially flat design and have stacking surfaces as well as laterally surrounding side surfaces that delimit the stacking surfaces. the Stack surfaces of two membranes and electrodes arranged one above the other in a cell stack, that is to say adjacently, are arranged facing one another, while the side surfaces are aligned facing outwards. The side surfaces are preferably aligned in such a way that the side surfaces of the membranes and electrodes lie in one plane. So that a half-cell interior can be formed between an electrode and a membrane, the membrane and the electrode can be connected to one another in a fluid-tight manner, for example on their outwardly facing side surfaces. Furthermore, it is possible to establish a fluid-tight connection between the edge regions of the electrode and the membrane, in particular the edge regions of the stacking surfaces facing one another. The fluid-tight connection can, for example, be materially bonded. Due to the fluid-tight connection of a membrane and an electrode, a sealed half-cell interior for accommodating an electrolyte can be formed in a simple manner without the need for components specially provided for this purpose.

In a further development of the method, at least one electrode and at least one membrane are each peripherally connected to at least one side plate in a fluid-tight manner, at least in sections. The electrodes and membranes are connected to at least one side plate in a fluid-tight manner. In particular, the electrodes and membranes are laterally connected to at least one side plate in a fluid-tight manner, at least in sections, on at least one side surface facing outwards. For example, in the case of electrodes and membranes with a rectangular base area, the four outwardly pointing side surfaces of the electrodes and membranes are each connected to a side plate, so that a cell stack of four laterally attached side plates is sealed off in a fluid-tight manner. Furthermore, the membrane and the electrode can be connected to at least one side plate in a fluid-tight manner on their stacking surfaces, in particular on the stacking surfaces facing one another. Here, the edge areas of the facing sides of the stack surfaces can be fluid-tight, for example materially bonded to the side plate. The fluid-tight connection of a membrane, an electrode and the side plates enables the formation of a half-cell interior for accommodating an electrolyte in a simple manner.

In a further development of the method, at least one half-cell interior has at least one electrolyte inlet and/or at least one electrolyte inlet and at least one electrolyte outlet and/or at least one electrolyte outlet is fluid-tight through at least one opening in at least one formed between at least one membrane and at least one electrode connection formed. To form a half-cell interior, an electrode and a membrane are connected to one another in a fluid-tight manner. The half-cell interior for accommodating the electrolyte is thus formed between the stacking surfaces of the electrode, the membrane and the fluid-tight connection. In order to enable the electrolyte to be fed into and removed from the interior of the half-cell, an electrolyte feed and/or an electrolyte discharge, in particular in the form of a cavity, is introduced into the fluid-tight connection. For example, the electrolyte supply or the electrolyte discharge can be introduced into the fluid-tight connection by a machining process, for example by drilling, milling or the like. If the fluid-tight connection is produced using an adhesive material, placeholders can also be arranged before the adhesive material is applied at the positions at which the cavities for forming the electrolyte feed and/or the electrolyte discharge are later to be located. The placeholders can be removed to release the cavity.

In a development of the method, each half-cell has at least one cell frame, at least one half-cell interior is formed at least in sections by at least one cell frame, and at least one cell frame, at least one membrane and at least one electrode are stacked. The cell interiors of the half-cells Cell stacks can be formed in sections by cell frames and the stacking surfaces of the membrane and the electrode. In particular, an electrode, a cell frame and a membrane can be stacked to produce a half-cell, with the fluid-tight sealing of a half-cell interior being able to take place through the fluid-tight connection of the electrode and the membrane.

In a further development of the method, at least one electrode, at least one membrane and at least one cell frame are each laterally connected in a fluid-tight manner to at least one outward-facing side surface, at least in sections. In order to create a fluid-tight seal for the interior of the half-cell, an electrode, a membrane and a cell frame are connected in a fluid-tight manner on their laterally outward-facing side surfaces.

In a development of the method, at least one electrode, at least one membrane and at least one cell frame are each laterally connected to at least one side plate in a fluid-tight manner on at least one outwardly facing side surface, at least in sections. The electrodes, the membranes and the cell frames of a cell stack can be connected to at least one side plate in a fluid-tight manner at the side with their outwardly facing side surfaces. In the case of membranes and electrodes with rectangular base areas, a side plate is preferably assigned to each of the four side areas, so that a cell stack is laterally surrounded by four side plates. By connecting the components using side plates, a very cost-effective and time-efficient option for a fluid-tight connection is created.

In one embodiment of the method, at least one fluid-tight connection is produced by a material connection. By using a material connection, such as welding or gluing, a secure fluid-tight connection that can be established quickly can be ensured.

In one embodiment of the invention, at least one fluid-tight connection is produced by an adhesive connection. A fluid-tight connection of the membranes to the electrodes or a connection of the components to a side plate can be achieved in a simple manner by means of an adhesive connection. In particular when using side plates, a connection to the side surfaces of the components of the cell stack can be carried out by applying an adhesive material to the inside of the side surfaces.

In a development of the invention, at least one fluid-tight connection is produced by a welded connection. Welded connections can be used to produce a fluid-tight connection, for example the side surfaces of the membranes and the electrodes. The production of fluid-tight connections by means of welded connections makes it possible to make connections that are particularly secure and can be carried out precisely.

In a further development of the invention, the stacked cell frames and/or membranes and/or electrodes are mechanically removed congruently at the sides. After the components required for a cell stack have been stacked, they can be mechanically removed laterally in order to produce a side surface that is as flat and congruent as possible. The mechanical removal, for example by machining, enables particularly precise and easy-to-execute connections of the side surfaces of the components.

In the following, the invention is explained in more detail using an exemplary embodiment illustrated in the drawing. The schematic representations in detail show: 1: a cell stack made of membranes and electrodes which are connected to one another in a fluid-tight manner;

2: a cell stack with openings in the fluid-tight connections;

3: a cell stack of components according to the invention in a sectional view;

Fig. 4: a cell stack formed by the side plates

electrolyte lines;

Fig. 5: a cell frame in a sectional representation.

6a: membrane and electrode with a fluid-tight connection between the stack surfaces;

6b: membrane and electrode with a fluid-tight connection between the side surfaces;

Fig. 6c: membrane and electrode with fluid-tight connection of

side surfaces to side plates;

Fig. 6d: Electrode and membrane with fluid-tight connection of

stacking surfaces to side panels, and

7: a cell frame arranged between a membrane and an electrode with lateral projections.

FIG. 1 shows a cell stack 1 consisting of electrodes 2 and membranes 3 in cross section. An electrode 2 and a membrane 3 are one

Stacked half-cell 5, with a membrane 3 and an electrode 2 being associated with two half-cells 5 in each case. The Flalbzellen 5 each have a Half-cell interior 6, with a half-cell interior 6 being surrounded by the membrane 3 and the electrode 2. A half-cell interior 6 is designed to accommodate an electrolyte. The electrodes 2 and the membranes 3 are connected to one another in a fluid-tight manner. The fluid-tight connection 14 of the electrodes 2 and the membranes 3 results in a fluid-tight construction of the cell stack 1 , with no electrolyte being able to accidentally pass from one half-cell 5 into another half-cell 5 . In order to enable electrolyte circulation, electrolyte inlets 8 and electrolyte outlets 9 are provided, so that an electrolyte can be conducted through the interior spaces 6 of the half-cell. Correspondingly, passage openings 10 are formed in the fluid-tight connections 14 between the electrodes 2 and the membranes 3, through which the electrolyte can pass. For example, electrolyte supply lines and electrolyte discharge lines can be connected to the passage openings 10 .

FIG. 2 shows a sectional view of a cell stack 1 consisting of electrodes 2 and membranes 3 which are connected to one another by fluid-tight connections 14 . In the fluid-tight connections 14, passage openings 10 are arranged, through which an electrolyte circulation through the half-cell interiors 6 is made possible.

FIG. 3 shows a cell stack 1 with electrodes 2, membranes 3 and cell frames 4 in cross section. An electrode 2, a membrane 3 and a cell frame 4 are stacked to form a half-cell 5, with a membrane 3 and an electrode 2 being assigned two half-cells 5 in each case. The half-cells 5 each have a half-cell interior 6 , with a half-cell interior 6 being surrounded by the cell frame 4 , the membrane 3 and the electrode 2 . A half-cell interior 6 is designed to accommodate an electrolyte. The outwardly facing side surfaces 15 of the electrodes 2, the side surfaces 16 of the membranes 3 and the side surfaces 17 of the cell frames 4 are connected to side plates 7 with a fluid-tight connection 14. Through the fluid-tight connection 14 of the side plate 7 with the components of the cell stack 1, ie with the electrodes 2, the membranes 3 and the cell frame 4, the structure of the cell stack 1 is inherently fluid-tight, with no electrolyte being able to accidentally get from one half-cell 5 into another half-cell 5. In order to enable electrolyte circulation, the cell frames 4 have electrolyte inlets 8 and electrolyte outlets 9 with passage openings 10 so that an electrolyte can be conducted through the half-cell interiors 6 . Correspondingly, the side plates 7 have passage openings 10 through which the electrolyte can pass. For example, electrolyte supply lines 18 and electrolyte discharge lines 19 can be connected to the passage openings 10 .

FIG. 4 shows a cell stack 1 with electrodes 2, membranes 3 and cell frame 4 in cross section. The same components are provided with the same reference characters. The electrodes 2, membranes 3 and the cell frames 4 are laterally peripherally connected with fluid-tight connections 14 to form half-cell interiors 6 . To supply the half cell interiors 6 7 electrolyte supply lines 18 and electrolyte discharge lines 19 are provided in the side plates. The electrolyte lines 18, 19 can be formed by grooves in the side plates 7, for example. The electrolyte can flow through the lines 18 and 19 into the half-cell interiors 6 and be discharged again accordingly.

FIG. 5 shows a sectioned view of a cell frame 4 with a half-cell interior 6 . The half-cell interior 6 is designed to accommodate an electrolyte. The cell frame 4 has an electrolyte inlet 8 and an electrolyte outlet 9 for the supply and discharge of an electrolyte. The electrolyte feed 8 and the electrolyte discharge 9 each have a passage opening 10 which is arranged in an outwardly facing side surface of the cell frame 4 in each case. The electrolyte feed 8 and the electrolyte discharge 9 widen from the passage openings 10 in the direction of the half-cell interior 6 . Thus is allows an electrolyte to flow evenly through the half-cell interior 6 .

An electrode 2 with a stacking surface 12 and a membrane 3 with a stacking surface 13 are shown in FIG. 6a. The side areas of the stacking surface 13 and the stacking surface 12 are connected to one another by a fluid-tight connection 14 . The fluid-tight connection 14 can in particular be an integral connection, for example a welded connection or an adhesive connection. A semi-cell interior 6 for receiving an electrolyte is formed by the fluid-tight connection 14 formed circumferentially on the side regions of the stacking surfaces 12 and 13 and by the stacking surfaces facing one another.

An electrode 2 with side surfaces 15 and a membrane 3 with side surfaces 16 are shown in FIG. 6b. The side surfaces 15 and 16 facing outwards are connected to one another with a fluid-tight connection 14 . Due to the fluid-tight connection 14 between the membrane 3 and the electrode 2 and the mutually facing stacking surfaces 12, 13, a flask cell interior 6 is thus formed, which is provided for accommodating an electrolyte.

An electrode 2 and a membrane 3 are shown in FIG. 6c. The side surfaces 15 of the electrode and the side surfaces 16 of the membrane are connected to side plates 7 by means of a fluid-tight connection 14 . Due to the fluid-tight connection 14 of the electrode 2 and the membrane 3 to the side plates 7, a flask cell interior 6 for receiving an electrolyte is formed between the electrode 2 and the membrane 3.

A membrane 3 and an electrode 2 are shown in FIG. 6d. The electrode 2 has a fluid-tight connection 14 to a side plate 7 in the edge regions of its stacking surface 12 . Likewise, the membrane 3 has a fluid-tight connection 14 in the edge regions of its stacking surface 13 the side plates 7 on. The fluid-tight connection 14 to the side plates 7 and also the mutually facing stacking surfaces 12, 13 form a half-cell interior 6 for accommodating an electrolyte.

7 shows a cell frame 4 with lateral projections 20, 21, the cell frame 4 being arranged between an electrode 2 and a membrane 3. FIG. The electrode 2 and the membrane 3 have a fluid-tight connection 14 in their edge regions, which is only interrupted by the lateral projections 20, 21 of the cell frame 4. The lateral overhang 20 forms an electrolyte feed 8 and the lateral overhang 21 forms an electrolyte outlet 9 . The lateral projections 20, 21 of two adjacent half-cells are offset from one another. The lateral projections 20 or 21 of the cell frames of the half-cells, through which the same electrolyte flows, are arranged one below the other, ie congruently in a plan view. An electrolyte conducting element 22 can be arranged over the lateral projections 20 or 21 of the half-cells, which are congruent in the cell stack, so that the corresponding half-cells are supplied with or disposed of with the same electrolyte.

All of the features mentioned in the above description and in the claims can be combined in any selection with the features of the independent claim. The disclosure of the invention is therefore not limited to the combinations of features described or claimed, rather all combinations of features that make sense within the scope of the invention are to be regarded as disclosed.

Claims

patent claims

1 . Component, in particular for a redox flow battery, with at least one cell, one cell being constructed from two half-cells (5), each half-cell (5) having at least one half-cell interior (6) for accommodating an electrolyte, each cell having at least an electrode (2) and at least one membrane (3) is assigned and wherein at least one electrode (2) and at least one membrane (3) are stacked, d ad rch ge kennn ze i ch n et that at least one electrode (2) and at least one membrane (3) are fluid-tightly connected at least in sections.

2. The component according to claim 1, characterized in that at least one electrode (2) and at least one membrane (3) are each laterally peripherally connected at least partially in a fluid-tight manner.

3. The component according to claim 1 or 2, characterized in that at least one electrode (2) and at least one membrane (3) are each circumferentially connected to at least one side plate (7) at least partially fluid-tight.

4. The component according to one of claims 1 to 3, characterized in that at least one fluid-tight connection (14) is an integral connection.

5. The component according to any one of claims 1 to 4, characterized in that the at least one electrode (2) and the at least one membrane (3) are connected to one another directly at least in sections in a fluid-tight manner, and that the half-cell interior ( 6) is sealed fluid-tight at least in sections, and/or that the at least one electrode (2) and the at least one membrane (3) are connected directly in a fluid-tight manner, at least in sections, to at least one side plate (7), that the half-cell interior (6) is closed off in a fluid-tight manner at least in sections by the fluid-tight connections (14).

6. The component according to one of claims 1 to 5, characterized in that at least one half-cell interior (6) that is fluid-tight at least in sections is located between the at least one electrode (2), the at least one membrane (3) and the fluid-tight connection (14) between the membrane (3) and the electrode (2) and/or that at least one semi-cell interior (6) that is fluid-tight at least in sections is formed between the at least one membrane (3), the at least one electrode (2) and the fluid-tight connections (14) of the membrane (3) and the electrode (2) is formed into the at least one side plate (7).

7. The component according to any one of claims 4 to 6, characterized in that at least one material connection is an adhesive connection.

8. The component according to any one of claims 4 to 7, characterized in that at least one material connection is a welded connection.

9. The component according to any one of claims 1 to 8, characterized in that at least one half-cell (5) has at least one cell frame (4) and that at least one cell frame (4) with at least one membrane (3) and at least one electrode (2) is stacked.

10. The component according to one of claims 1 to 9, characterized in that at least one half-cell interior (6) is associated with at least one electrolyte supply (8) and/or at least one electrolyte discharge (9). and that at least one electrolyte inlet (8) and/or at least one electrolyte outlet (9) is formed through at least one opening in at least one fluid-tight connection (14) formed between at least one membrane (3) and at least one electrode (2).

11. The component according to claim 9 or 10, characterized in that a half-cell (5) has at least one electrolyte inlet (8) and/or one electrolyte outlet (9) and that at least one electrolyte inlet (8) and/or at least one electrolyte outlet (9 ) is formed in each case at least in sections by at least one cavity in a cell frame (4) and a passage opening (11) arranged laterally in a cell frame (4).

12. The component according to one of claims 9 to 11, characterized in that at least one half-cell (5) has at least one electrolyte feed (8) and/or at least one electrolyte discharge (9), that a cell frame (4) is formed by at least two cell frame elements and that at least one electrolyte feed (8) and/or at least one electrolyte discharge (9) is formed at least in sections through at least one free space between at least two cell frame elements.

13. The component according to one of claims 1 to 12, characterized in that at least one electrolyte feed (8) is connected to at least one electrolyte feed line (18) and at least one electrolyte outlet (9) is connected to at least one electrolyte outlet line (19) and that at least one Electrolyte supply line (18) and/or at least one electrolyte discharge line (19) runs outside the stacking surface (12) of the electrode and/or the stacking surface (13) of the membrane (3) and/or the stacking surface of the cell frame (4).

14. Component according to one of claims 3 to 13, characterized in that at least one electrolyte supply line (18) and/or at least one electrolyte discharge line (19) is formed by at least one cavity in at least one side plate (7).

15. The component according to claim 3 to 13, characterized in that at least one electrolyte supply line and / or at least one

Electrolyte discharge line is arranged outside of the side plates (7).

16. The component according to claim 9, characterized in that at least one

Cell frame (4) has at least one electrolyte supply line (8) and/or at least one electrolyte discharge line (9) and that at least one cell frame (4) has at least one electrolyte supply line and/or at least one

Electrolyte discharge line at least partially forms and that the at least one electrolyte supply (8) and / or the at least one

Electrolyte discharge (9) is fluid-tightly connected to the electrolyte supply line and/or to the electrolyte discharge line.

17. A method for producing at least one component, in particular for a redox flow battery, with at least one cell, wherein a cell is made up of two half-cells (5), each half-cell (5) having at least one half-cell interior (6) for accommodating a Electrolytes, wherein each cell is assigned at least one electrode (2) and at least one membrane (3), wherein at least one electrode (2) and at least one membrane (3) are arranged stacked, d ad u rch ge ken ze i ch n et that at least one electrode (2) and at least one membrane (3) are fluid-tightly connected.

18. The method according to claim 17, characterized in that at least one

Electrode (2) and at least one membrane (3) are each laterally peripherally connected fluid-tightly at least in sections.

19. The method according to any one of claims 17 or 18, characterized in that at least one electrode (2) and at least one membrane (3) are each circumferentially at least partially connected fluid-tight with at least one side plate (7).

20. The method according to any one of claims 17 to 19, characterized in that at least one half-cell interior (6) has at least one electrolyte inlet (8) and/or at least one electrolyte outlet (9) and that at least one electrolyte inlet (8) and/or at least one Electrolyte drain (9) is formed through at least one opening in at least one fluid-tight connection formed between at least one membrane (3) and at least one electrode (2).

21. The method according to any one of claims 17 to 20, characterized in that each half-cell (5) has at least one cell frame (4), that at least one half-cell interior (6) is formed at least in sections by at least one cell frame (4) and that at least one Cell frames (4), at least one membrane (3) and at least one electrode (2) are stacked.

22. The method according to any one of claims 17 to 21, characterized in that at least one fluid-tight connection (14) is produced by a material connection.

23. The method according to claim 22, characterized in that at least one fluid-tight connection (14) is produced by an adhesive connection.

24. The method according to claim 23, characterized in that at least one fluid-tight connection (14) is produced by a welded connection.