Method for manufacturing ribbon-shaped electrodes and device therefor

Abstract

A method and a device are proposed for manufacturing a ribbon electrode, the ribbon electrode being manufactured comprising a ribbon current collector coated on both sides with a layer of electrode material and having on both sides an area extending along one of its longitudinal edges that is not coated with electrode material, in which a ribbon metal foil (100) is coated with the electrode material in a continuous process, a number of parallel strips (120) of electrode material are applied to a first side of the ribbon metal foil (100) and an equal number of parallel strips (110) of electrode material are applied to a second side of the ribbon metal foil (100), so that in a line of sight perpendicular to the ribbon metal foil (100), in each case one strip on the first side (120) overlaps one of the strips on the second side (110) of the ribbon metal foil (100). On both sides between directly adjacent parallel strips of electrode material (110, 120), non-coated strip-like areas (111, 121) remain free of electrode material. The method is characterized in that the parallel strips of electrode material (110, 120) are simultaneously applied to the first and second sides of the ribbon-shaped metal foil (100).

Description

Technical Field

[0005] ,

[0004] ,

[0001] The present invention relates to a method for manufacturing a ribbon-shaped electrode including a ribbon-shaped current collector coated on both sides with a layer of electrode material and having on both sides a region extending along one of its longitudinal edges that is not coated with electrode material. Further, the present invention relates to a device for manufacturing such an electrode, as well as to the use of such an electrode and to an electrochemical energy storage element that can be manufactured using these.

Background Art

[0002] Electrochemical energy storage elements can convert stored chemical energy into electrical energy by means of redox reactions. The simplest form of an electrochemical energy storage element is an electrochemical cell. It includes a positive electrode and a negative electrode separated from each other by a separator. During discharge, electrons are released at the negative electrode as a result of an oxidation process. This gives rise to an electron current that can be drawn by an external power-consuming device for which the electrochemical cell serves as an energy supplier. At the same time, an ion current corresponding to the electrode reaction occurs within the cell. This ion current crosses the separator and is made possible by an ion-conductive electrolyte. <00,00011> If the discharge of an electrochemical energy storage element is reversible, i.e., if it is possible to reverse the conversion of chemical energy into electrical energy during discharge and recharge the cell or element again, this is said to be a secondary element. For secondary elements, the common denominations of the negative electrode as the anode and the positive electrode as the cathode refer to the discharge function of the electrochemical energy storage element.

[0004] In this case, the term "electrochemical energy storage element" is understood to mean not only a single electrochemical cell but also a battery composed of a plurality of individual electrochemical cells.

[0005] International Publication No. 2017 / 215900A1 describes a cylindrical circular cell in which an assembly in the form of a wound body is formed from ribbon-shaped electrodes. Each electrode has a current collector on which the electrode material is mounted. Electrodes of opposite polarity are arranged offset from each other in the assembly, such that the longitudinal edge of the positive electrode current collector protrudes from one end face and the longitudinal edge of the negative electrode current collector protrudes from a second end face of the wound body. For electrical contact of the current collectors, the cell has a contact plate that sits on the end face of the wound body and is welded to the protruding longitudinal edge of the current collector. This allows electrical contact to be made along the entire length of the current collector and thus also the associated electrodes. This significantly reduces the internal resistance within the cell described above. As a result, the generation of large currents can be absorbed much better, and heat can be dissipated more effectively from the wound body.

[0006] To ensure good contact of the longitudinal edge of the current collector to the contact plate in such a cell, it is convenient to form a winding using a ribbon-shaped electrode that does not contain electrode material along one of its longitudinal edges, i.e., the longitudinal edge that is in contact. Therefore, these ribbon-shaped electrodes are ribbon-shaped current collectors with layers of positive or negative electrode material coated on both sides, and have a region along one of its longitudinal edges that is not covered on both sides with electrode material. Along its second longitudinal edge, the current collector preferably does not have such a free edge region.

[0007] It is known that such ribbon electrodes can be manufactured by a coating process in which a paste-like electrode material is applied to a current collector. The current collector is typically a ribbon-shaped metal foil. The electrode material is applied using a slot die, for example, as described in European Patent No. 3608028B1. Generally, one side of the ribbon-shaped metal foil is first coated with a strip of electrode material in a tandem process. The strip coated on one side is then dried and wound up. In a later step, the second side of the ribbon-shaped metal foil is coated with the same electrode material in the form of a strip, and then dried, in the same manner as before.

[0008] Ideally, the electrode material strips should be applied to both sides of the current collector in such a way that there is no offset, i.e., the strips on both sides completely overlap in a line of sight perpendicular to the ribbon-shaped metal foil. In particular, the areas on both sides of the current collector that are not covered with electrode material must also have a certain width along each longitudinal edge along the entire length of the electrode. This is difficult to achieve with the tandem process described above, and the required precision is often not achieved.

[0009] It is also known that several parallel strips of electrode material are coated onto both sides of a ribbon-shaped metal foil to produce an electrode strip with a free edge region, and then the metal foil is cut, for example, between the strips so that several ribbon electrodes are obtained from the coated ribbon-shaped metal foil. However, this procedure also has the problem of misalignment between strips on different surfaces of the current collector.

[0010] To address these issues, one approach was to mask areas of the metal foil that were not to be coated with the electrode material and remove the masking after the coating was complete. However, this procedure is extremely time-consuming, as it would typically require additional steps to remove adhesive residue. Another approach involves subsequent removal of the coating within the longitudinal edge region of the electrode strip, for example, by laser or mechanical means.

[0011] Therefore, known prior art methods for manufacturing ribbon-shaped electrodes with edge regions that do not contain electrode material still do not provide a satisfactory solution that achieves the required accuracy of coatings, especially in mass production, while simultaneously keeping costs within acceptable limits. [Overview of the project] [Problems that the invention aims to solve]

[0012] Against this backdrop, the present invention aims to provide an improved method for manufacturing a ribbon electrode having a ribbon current collector coated on both sides with an electrode material, wherein one of its longitudinal edges is not coated with the electrode material, and an edge region is provided for electrical contact, for example, a contact plate. With mass production in mind, it is desirable to manufacture several ribbon electrodes in parallel, thereby addressing the problem of track offset between the coated regions of the ribbon electrodes. Therefore, the method must enable the manufacture of ribbon electrodes with high precision while simultaneously being suitable for mass production. [Means for solving the problem]

[0013] This objective is achieved by the methods and devices described later. A preferred embodiment of the described method has the features of claim 1. A preferred embodiment of the method is the subject of the claims dependent on claim 1. A preferred embodiment of the device for manufacturing ribbon electrodes is the subject of independent claim 8. Further preferred embodiments of this device will also become apparent from the dependent claims. Further included in the present invention, as will also become apparent from further independent claims, are ribbon electrodes manufactured according to the described method, as well as the use of such ribbon electrodes and electrochemical energy storage elements having such ribbon electrodes.

[0014] The method according to the present invention is used to manufacture a ribbon-shaped electrode including a ribbon-shaped current collector. The current collector has two surfaces, both surfaces of which are covered with a layer of electrode material. Furthermore, the current collector has a region on both surfaces that extends along one of its longitudinal edges and is not covered with electrode material. Therefore, along this longitudinal edge, the current collector does not contain electrode material on either surface. This region is intended to make electrical contact with an electrode, such as a contact plate or housing of an electrochemical energy storage cell or battery.

[0015] The method for manufacturing such a ribbon-shaped electrode according to the present invention includes the following method steps: a. Steps for providing a ribbon-shaped metal foil. b. A method step in a continuous process for coating a ribbon-shaped metal foil with an electrode material, wherein, by means of a coating nozzle, a plurality of parallel strips of the electrode material are coated onto a first surface of the ribbon-shaped metal foil, and an equal number of parallel strips of the electrode material are coated onto a second surface of the ribbon-shaped metal foil, so that, in a line of sight perpendicular to the ribbon-shaped metal foil, in each case one strip on the first surface overlaps with one of the strips on the second surface of the ribbon-shaped metal foil, and on both sides between directly adjacent parallel strips of the electrode material, uncoated strip-shaped regions remain free of the electrode material.

[0016] This method is characterized in particular by the following features: c. The parallel strips of electrode material are applied simultaneously to the first and second surfaces of the ribbon-shaped metal foil. Simultaneous coating means that both sides of a ribbon-shaped metal foil are coated simultaneously in a single operation, with the two sides overlapping in time.

[0017] The process preferably involves coating both sides of a metal foil in a single pass in a coating device, particularly a device for manufacturing ribbon-shaped electrodes as described later. Particularly preferably, the coating on both sides may be carried out in a continuous throughput process in which both sides of the metal foil are coated simultaneously and spatially offset as necessary.

[0018] Unlike conventional manufacturing processes, where each side of the metal foil is subsequently dried, it is preferable not to coat one side of the metal foil before the other side is coated in a separate operation. Instead, the method according to the present invention provides that the coating of the first and second sides is carried out simultaneously. Multiple processing of the ribbon-shaped metal foil in a continuous coating operation, including related winding, unwinding, deflection, and calibration operations, is not required. As a result, potential offset problems between strips on the first and second sides of the ribbon-shaped metal foil can be better addressed.

[0019] In conventional methods, an offset of a few tenths of a millimeter is common for overlapping strips on both sides of a metal foil. Such misalignment has a very detrimental effect on electrode performance. In addition, the suboptimal fit of the strips can cause problems during subsequent processing of the electrodes to the energy storage element and during the necessary electrical contact of the electrodes. Since the simultaneous coating process improves the precision of strip coating, these disadvantages can be avoided in the manufacturing process according to the present invention.

[0020] In relation to the present invention, the term “ribbon-shaped metal foil” should be understood not only as a metal foil in the actual sense, but more generally as any flat ribbon-shaped substrate having sufficiently high electrical conductivity to serve as a current collector for an electrode. Thus, a ribbon-shaped substrate in this sense may also be graphite foil or other forms of film-like substrates having a graphitized, metallized, or electrically conductive coating for the manufacture of ribbon-shaped electrodes. Other suitable strip-shaped substrates are also substrates based on nonwoven fabrics made of metal nets or metal grids or metal foams or metallized yarns. In a particularly preferred embodiment of the method, it is detected whether an offset occurs between overlapping strips on a first surface and a second surface, and / or whether the offset exceeds a predetermined threshold. In a particularly preferred embodiment, the offset of the strips thus detected is corrected by correcting the position of at least one coating nozzle relative to the ribbon-shaped metal foil.

[0021] In a particularly preferred and advantageous embodiment of the method according to the present invention, it is further characterized by at least one of the following additional features a. to c.: a. Strips of electrode material shall be applied using a coating nozzle. b. Preferably, at least one sensor detects whether an offset occurs between overlapping strips on the first and second surfaces, and / or whether the offset exceeds a predetermined threshold. c. If an offset occurs between overlapping strips on the first and second surfaces, and / or if the offset exceeds a predetermined threshold, the position of at least one coating nozzle on the ribbon-shaped metal foil is corrected. The preceding features a. to c. are, in particular, implemented in combination.

[0022] In this preferred embodiment of the method according to the invention, the actual offset occurring between the overlapping strips on the first and second faces of the metal foil is detected and / or measured, whereby corrective measures can be initiated as necessary. Preferably, at least one position of the coating nozzle onto which the strip of electrode material is applied is corrected as appropriate for this purpose. In this embodiment of the method, it is thus provided that the position of one or more coating nozzles can be changed. Thus, after the short levelling phase during the coating of both faces of the ribbon-shaped metal foil, it is possible to check whether a track offset exists, whereby intervention and correction can be carried out very quickly as necessary. The control distance between the coatings of the two faces is preferably short enough that the coating tracks can be controlled individually. This can be advantageous if the coating is independent of other parameters such as subsequent drying. This results in a highly accurate double-lane coating of both faces that matches exactly. Thus, a double-lane strip coating of both faces can be achieved that requires no subsequent correction or rework for highly accurate tracking.

[0023] In a particularly advantageous embodiment of the method according to the invention, the method is characterized by at least one of the following additional features a. and b: a. The strip of electrode material is applied to at least one of the faces of the ribbon-shaped metal foil by means of several single-nozzle coating heads each having a coating nozzle, the positions of which relative to each other can be changed. b. Each of the single-nozzle coating heads is displaceable perpendicular to the direction of passage of the ribbon-shaped metal foil. It is particularly preferred that the above features a. and b. are implemented in combination with each other. [[ID=eleven]]

[0024] In this embodiment where the single nozzle coating head is displaceable perpendicular to the direction in which the ribbon-shaped metal foil passes (preferably at a certain distance from the metal foil), the distance between the coating nozzle and the edge of the metal foil can be changed, whereby the system can respond to any offset that may occur during the coating of the two surfaces on the overlapping strips on both sides of the metal foil, and the position of one or more coating nozzles can be corrected.

[0025] In principle, corresponding adjustable single nozzle coating heads can be provided on both sides of the ribbon-shaped metal foil so that corrections can be made on both sides of the metal foil during coating.

[0026] However, in a particularly preferred embodiment, at least one of the additional features shown hereinafter is provided: a. The strip of electrode material is applied to the first surface of the ribbon-shaped metal foil by at least one multi-nozzle coating head including several coating nozzles at a fixed distance from each other. b. The application of the strip of electrode material is carried out on the second surface of the ribbon-shaped metal foil by a single nozzle coating head having each coating nozzle, and the position of which can be changed relative to other coating nozzles.

[0027] Preferably, the above features a. and b. are realized in combination with each other, whereby on one side of the ribbon-shaped metal foil, the coating is carried out by a rigid coating nozzle or one or more multi-nozzle coating heads including several coating nozzles at a fixed distance from each other, while on the other side, the coating of the ribbon-shaped metal foil is carried out by a flexible coating nozzle, particularly several single nozzle coating heads whose positions can be changed.

[0028] In this embodiment, if any misalignment occurs, the coating on one side of the metal foil surface can be adjusted, so that a rigid coating nozzle can be used on the other side without further disadvantage, thereby limiting the use of a somewhat more complex flexible coating nozzle to one side.

[0029] The first and second surfaces described herein are, in principle, interchangeable. Therefore, when coating metal foil, a rigid coating nozzle can be assigned to both surface A and surface B, and a flexible coating nozzle can be assigned to both surface B and surface A.

[0030] In this particularly advantageous embodiment of the method according to the present invention, the simultaneous double-sided multi-lane coating of two sides of a ribbon-shaped metal foil with an electrode material is performed in a continuous manner, so to speak, on a moving belt, using one or optionally several nozzle coating heads having two or more rigidly arranged coating nozzles. The coating of the other side of the ribbon-shaped metal foil with the electrode material is performed using two or more single-nozzle coating heads, each having a coating nozzle. In this case, the single-nozzle coating heads are arranged so that they can be moved across the width of the ribbon-shaped metal foil in such a manner that the application of the electrode material can be adjusted and corrected by moving the single-nozzle coating heads to avoid offsets between tracks of electrode material on both sides of the metal foil.

[0031] Both the coating nozzles of a multi-nozzle coating head and the coating nozzles of a single-nozzle coating head may be designed in accordance with European Patent No. 3608028B1.

[0032] The detection of possible offsets between overlapping strips on the first and second surfaces of a ribbon-shaped metal foil can be carried out in different ways. Particularly preferred is the use of a sensor system capable of detecting this offset in an automated manner. In a preferred embodiment of this method, at least one of the following additional features can be realized: a. In order to detect possible offsets between overlapping strips on the first and second surfaces of the ribbon-shaped metal foil, at least one distance of the strip from the longitudinal edge of the ribbon-shaped metal foil and / or a change in this distance is detected. b. In order to detect possible offsets between overlapping strips on the first and second surfaces of a ribbon-shaped metal foil, at least one distance of a strip from an adjacent strip and / or a change in this distance is detected. c. The centerlines of the strips and / or changes in the centerlines of the strips are detected in order to detect possible offsets between overlapping strips on the first and second surfaces of the ribbon-shaped metal foil. In preferred embodiments, features a. to c. described above can be implemented selectively. However, preferably, two or three of features a. to c. described above, and in particular features a. and b., can be implemented in combination with each other.

[0033] For example, a camera may be advantageously used as a sensor to detect possible offsets. In other embodiments, for example, an edge sensor or similar may be used. Another possibility is, for example, the measurement of light reflection, because the coated and uncoated areas of a metal foil can be clearly distinguished from each other by their reflective properties.

[0034] In a further preferred embodiment of the method according to the present invention, it may be provided that the position and / or boundary of a strip applied to a first surface of a metal foil is already determined, preferably by a sensor system, after the coating of the first surface. This information can be taken into consideration in alignment and / or position correction of the coating nozzle for coating the second surface.

[0035] In particularly preferred and advantageous embodiments of the method according to the present invention, the method further features at least one of the following additional features: a. After coating both sides of the ribbon-shaped metal foil, the strip of electrode material is dried. b. The electrode material is dried in an air-flow dryer. Preferably, features a. and b. described above are realized in combination with each other.

[0036] Generally, it is advantageous to dry electrode materials immediately after they are applied to ribbon-shaped metal foil. Such drying is well known in principle. The method according to the present invention can be distinguished from conventional methods, in particular, by the fact that the drying of the coating is carried out simultaneously on both sides of the ribbon-shaped metal foil, i.e., in the same work step with overlapping time. As a result, exactly the same conditions prevail for drying the coating on both sides of the ribbon-shaped metal foil, thereby preventing further tolerances from occurring in the coating on both sides, and therefore preventing further tolerances from occurring in trace coatings due to simultaneous drying. This measure also further improves the production of highly accurate and matched strips of electrode material on both sides of the metal foil. In addition, simultaneous drying of the coating improves the energy balance of the method.

[0037] The use of an airflow dryer for drying is particularly advantageous because there is no contact between the metal foil, which has just been coated on both sides, and, for example, a roller or similar. For example, a vacuum plate combined with an air nozzle can be used for an airflow dryer in a manner known in itself.

[0038] An additional intermediate drying step may also be advantageous as an alternative to drying both sides of a ribbon-shaped metal foil after coating both sides. In these further embodiments of the method, it may be provided that an intermediate pre-drying or drying step is performed in the course of the method after coating the first side. In this case, the metal foil coated on one side may pass through the first drying device in a continuous manner before the second side of the metal foil is coated. In this embodiment, since this is a continuous throughput process, both sides are coated similarly and simultaneously. Intermediate drying has the particular advantage that a deflection roller or similar can engage with the already coated side of the metal foil because the coating on the first side is very stable after drying.

[0039] In particular, the coating process according to the present invention can also be applied to a so-called tandem coating process. Preferably, the position or boundary of the coating track on the first surface of the metal foil is determined after it has left the first drying stage and is used to align the application nozzle of the second coating stage, thereby minimizing the offset of the coating track on the first surface relative to the coating track applied to the second surface of the metal foil.

[0040] When several strips of electrode material are coated onto a ribbon-shaped metal foil, it is desirable to cut the coated metal foil longitudinally in order to provide ribbon-shaped electrodes manufactured from the metal foil with a desired width.

[0041] In a particularly preferred embodiment of the method according to the present invention, at least one of the following additional features is provided: a. After coating both sides of the ribbon-shaped metal foil and / or after drying the electrode material, the ribbon-shaped metal foil coated with the electrode material is cut, specifically in the longitudinal direction, to form a ribbon-shaped electrode. b. In order to cut the ribbon-shaped metal foil, the foil is cut in the longitudinal direction, thereby the cutting is carried out through at least one uncoated strip-like region located between adjacent strips of electrode material. c. In order to cut the ribbon-shaped metal foil, the foil is cut in the lengthwise direction and cut through at least one of the strips. Preferably, the above-described features a. to c. are realized in combination with each other.

[0042] In these embodiments, the uncoated strip-like regions between adjacent strips of electrode material are preferably divided, specifically cut, in the longitudinal center, and the strips of electrode material are divided in the longitudinal center, thereby allowing several electrodes to be provided from the metal foil. The required length of the ribbon-like electrodes can then be appropriately cut depending on the desired dimensions of the energy storage element to be manufactured.

[0043] The width of the ribbon-shaped metal foil can be adapted to the number and dimensions of the ribbon-shaped electrodes to be manufactured. Preferably, two, three, four, or five strips can be coated onto both sides of the metal foil in an overlapping manner. For example, two ribbon-shaped electrodes can be obtained from two lane strips of electrode material coated on both sides by cutting once along the longitudinal direction.

[0044] Particularly preferably, for example, three to eight strips of electrode material can be coated onto both sides of a ribbon-shaped metal foil, thereby allowing six to sixteen electrode strips to be cut from there, which can then be cut to different lengths depending on the size of the energy storage cell to be manufactured.

[0045] In a preferred embodiment, the width of the ribbon-shaped metal foil may be, for example, 100 to 1000 mm, preferably about 200 to 800 mm. The strip of electrode material typically has a width in the range of 20 mm to 200 mm, preferably 50 mm to 150 mm. Its thickness is preferably less than 500 μm. The length of the ribbon-shaped metal foil may be, for example, 1000 to 3000 m.

[0046] Conventional materials well known to those skilled in the art for the manufacture of electrochemical energy storage elements can be used as materials for ribbon-shaped electrodes. For example, conventional anode electrode materials and cathode electrode materials can be used as electrode materials, thereby coating both sides of the ribbon-shaped metal foil with anode electrode material or with cathode electrode material.

[0047] The method according to the present invention is particularly suitable for the production of ribbon-shaped electrodes for lithium-ion cells.

[0048] Secondary lithium-ion cells are used as energy storage elements for many applications because they can provide high current and are characterized by relatively high energy density. They are based on the use of lithium, which can reciprocate between the electrodes of the cell in the form of ions. The negative and positive electrodes of lithium-ion cells are generally formed by so-called composite electrodes, which include electrochemically inactive and electrochemically active components.

[0049] In principle, any material capable of absorbing and releasing lithium ions can be used as an electrochemically active component (active material) for a secondary lithium-ion cell. For example, carbon-based particles such as graphitic carbon can be used as the negative electrode. Specifically, metal oxide compounds capable of reversibly intercalating lithium, such as lithium cobaltate (LiCoO2), lithium manganeseate (LiMn2O4), lithium iron phosphate (LiFePO4), or derivatives thereof, can be used as the positive electrode active material. Electrode materials used in connection with the present invention may contain these electrochemical active materials, particularly in particulate form.

[0050] Further components of the composite electrode are current collectors formed in the form of strips from a ribbon-shaped metal foil within a ribbon-shaped electrode manufactured according to the present invention. The current collectors serve as carriers for each active material. The current collector of the negative electrode (anode current collector) may be made of, for example, copper or nickel, and the current collector of the positive electrode (cathode current collector) may be made of, for example, aluminum. Therefore, the metal foil coated with the electrode material as part of the method according to the present invention is also preferably made of aluminum, nickel or copper.

[0051] Furthermore, the electrode (and thus the electrode material used in connection with the present invention) may include an electrode binder (e.g., polyvinylidene fluoride (PVDF) or another polymer, e.g., carboxymethylcellulose), conductivity-enhancing additives, and other additives as electrochemically inactive components. The electrode binder also ensures the mechanical stability of the electrode and, in many cases, the adhesion of the active material to the current collector.

[0052] The present invention further includes a device for manufacturing the ribbon-shaped electrode described above. This device includes the following features: a. The device includes a conveyor section for transporting a ribbon-shaped metal foil having first and second surfaces in a direction parallel to the longitudinal direction of the metal foil. b. The device includes a plurality of coating nozzles that serve to coat a first surface and a second surface of a ribbon-shaped metal foil with an electrode material and are positioned accordingly. c. The coating nozzle is positioned such that multiple parallel strips of electrode material can be coated onto a first surface of a ribbon-shaped metal foil, and an equal number of parallel strips of electrode material can be coated onto a second surface of the ribbon-shaped metal foil, so that, in a line of sight perpendicular to the ribbon-shaped metal foil, one strip on the first surface overlaps with one of the strips on the second surface of the ribbon-shaped metal foil, and on both sides between directly adjacent parallel strips of electrode material, the uncoated strip-like regions remain free of electrode material. d. The device is constructed such that a coating nozzle simultaneously coats a first surface and a second surface of a ribbon-shaped metal foil.

[0053] The device is constructed for continuous coating of a continuous ribbon-shaped metal foil, which forms the material for the current collector of the manufactured ribbon-shaped electrode, thereby, for this purpose, the corresponding rollers and deflection rollers and coating rollers can be provided in a manner that is in principle well known for conveying the ribbon-shaped metal foil in a continuous direction.

[0054] In a particularly preferred embodiment, the device is constructed to be capable of detecting whether an offset occurs between overlapping strips on a first surface and a second surface, and / or whether the offset exceeds a predetermined threshold, thereby allowing any possible offset to be corrected, preferably, by correcting the position of one or more coating nozzles.

[0055] Specifically, a coating nozzle constructed to coat a first and / or second surface of a metal foil may be assigned opposing coating rollers, so that the coating nozzle is positioned on one surface and the coating rollers are positioned on the other surface, thereby the coating rollers apply back pressure to the metal foil during the coating process.

[0056] The coating nozzles for coating one side and the other side are preferably arranged offset from each other in the flow direction, so that one side of the ribbon-shaped metal foil is coated before the other in the flow direction, and the metal foil is guided between the two coating positions, preferably via deflection rollers, to position the ribbon-shaped metal foil in a suitable position for coating.

[0057] With respect to a coating nozzle, the device, in a particularly preferred mode, features at least one of the following features: a. The device includes several single-nozzle coating heads, each having a coating nozzle, the positions of which can be changed relative to each other. b. The single nozzle coating head is displaceable perpendicular to the direction of passage of the ribbon-shaped metal foil. Preferably, features a. and b. described immediately above are realized in combination with each other.

[0058] These preferably displaceable single-nozzle coating heads are preferably provided within the device on only one side of the ribbon-shaped metal foil to be coated. However, in principle, single-nozzle coating heads that can be repositioned relative to each other may also be provided for coating on both sides of the metal foil. Embodiments having variable single-nozzle coating heads for both sides of the metal foil may be significantly advantageous in certain circumstances because they allow for significant flexibility in correcting any resulting track offsets.

[0059] The device according to the present invention is particularly preferably characterized by the following additional features: a. The device includes at least one multi-nozzle coating head, which includes a plurality of coating nozzles at a fixed distance from each other, and at least one multi-nozzle coating head is aligned to coat one side of a ribbon-shaped metal foil. b. The device includes several single-nozzle coating heads, each having a coating nozzle, the positions of which can be changed relative to one another, and the single-nozzle coating heads are aligned to coat the other side of a ribbon-shaped metal foil.

[0060] Preferably, features a. and b. described above are realized in combination with each other, so that a rigidly positioned coating nozzle is assigned to one side of the metal foil passing through the device, and the coating nozzle of the single-nozzle coating head described above is assigned to the other side of the metal foil. In particular, in this embodiment of the device, in a simpler way, it is possible to appropriately adjust the position of the coating nozzle on one side of the ribbon-shaped metal foil in response to any offset that may occur between overlapping strips on both sides of the ribbon-shaped metal foil. For this purpose, the device conveniently includes a corresponding device for moving the position of the single-nozzle coating head to avoid offsets between the coating of electrode material on both sides of the ribbon-shaped metal foil.

[0061] In a particularly preferred embodiment, the device according to the present invention is further characterized by at least one of the following additional features: a. The single nozzle coating heads are arranged offset from each other with respect to the direction of passage of the ribbon-shaped metal foil to be coated. b. The single nozzle coating head is positioned in two rows perpendicular to the direction of passage of the ribbon-shaped metal foil to be coated. Preferably, features a. and b. described above are realized in combination with each other.

[0062] These arrangements of the single-nozzle coating head enable a significantly space-saving configuration of the single-nozzle coating head, while simultaneously ensuring freedom of movement or displaceability of the coating nozzle in the lateral direction relative to the passage direction of the ribbon-shaped metal foil.

[0063] In a further preferred embodiment of the device according to the present invention, the coating nozzle and in particular the single-nozzle coating head can also be moved perpendicular to the plane of the metal foil, and thus raised and lowered as needed. This enables and / or facilitates intermittent coating when applying the track to the metal foil. Preferably, the individual single-nozzle coating heads can also be moved independently of each other in this direction, thereby raising and lowering them individually according to the pattern being applied.

[0064] In particularly advantageous embodiments, the device according to the present invention is further characterized by at least one of the following additional features: a. The device includes a sensor system for detecting possible offsets between overlapping strips on a first and second surface of a ribbon-shaped metal foil. b. The device includes a drying device for coated ribbon-shaped metal foil, preferably a floating dryer. c. The device includes a cutting device, specifically a cutting device for separating or cutting a coated ribbon-shaped metal foil in the longitudinal direction.

[0065] Preferably, the device according to the present invention includes a sensor system for detecting possible offsets between overlapping strips on both sides of a ribbon-shaped metal foil according to feature a. described above, a drying device according to feature b. described above, and a cutting device according to feature c. described above.

[0066] Details of the sensor system and drying device have already been described in connection with the method according to the present invention. Therefore, refer to the corresponding description.

[0067] The device preferably also includes a device for evaluating measurements recorded by the sensor system and converting these measurements into corrections for the position of the coating nozzle, such as a control unit.

[0068] The cutting device may be, for example, a conventional cutting device that works in cooperation with a suitable blade or laser.

[0069] The present invention further encompasses a control program for a device for manufacturing ribbon-shaped electrodes in the manner described above, the control program being constructed to carry out the method for manufacturing ribbon-shaped electrodes as described above. Specifically, the control program may be used to correct the position of the coating nozzle for coating if any offset occurs in overlapping strips of electrode material coated on both sides of a ribbon-shaped metal foil.

[0070] The present invention further includes ribbon-shaped electrodes manufactured by the method described above. Further details of these ribbon-shaped electrodes are referenced in the above description.

[0071] Furthermore, the present invention includes the use of ribbon-shaped electrodes manufactured by the method according to the present invention for manufacturing an electrochemical energy storage element, specifically an electrochemical energy storage cell or battery composed of a plurality of electrochemical energy storage cells. The energy storage element is also included in the present invention.

[0072] When manufacturing an electrochemical energy storage element, ribbon-shaped electrodes are preferably in contact via the edge region of an electrode strip that does not contain electrode material. For example, a contact plate may be provided for contact with the electrodes, or other elements of the housing of the energy storage element may be used for contact with the electrodes.

[0073] In a particularly preferred embodiment, the ribbon-shaped electrode is used to manufacture a lithium-ion cell.

[0074] Further features of the ribbon electrodes according to the present invention, which are part of these electrochemical energy storage elements, and methods for manufacturing these ribbon electrodes should be referred to in the above description.

[0075] Further features and advantages of the present invention will become apparent from the following description of examples accompanied by the drawings. Each feature can be realized individually or in combination with others. [Brief explanation of the drawing]

[0076] [Figure 1] This is a schematic diagram (partial diagram A) of a single-nozzle coating head having five coating nozzles for coating the first surface of a ribbon-shaped metal foil, and a schematic diagram (partial diagram B) of a multi-nozzle coating head having five coating nozzles for coating the second surface of a ribbon-shaped metal foil. [Figure 2] This is a schematic cross-sectional view of continuous multi-lane and simultaneous coating on both sides of a ribbon-shaped metal foil in a first embodiment of the device according to the present invention. [Figure 3] Figure 2 is an isometric view of the device according to the present invention, according to an embodiment of the device shown in Figure 2. [Figure 4] This is a schematic cross-sectional view of continuous multi-lane and simultaneous coating on both sides of a ribbon-shaped metal foil in a further embodiment of the device according to the present invention. [Figure 5] Figure 4 is an isometric view of the device according to the present invention, according to the embodiment shown. [Figure 6] This is a schematic cross-sectional view of continuous multi-lane and simultaneous coating on both sides of a ribbon-shaped metal foil in a further embodiment of the device according to the present invention. [Figure 7] This is an isometric view of a further embodiment of the device according to the present invention for continuous multi-lane and simultaneous coating on both sides of a ribbon-shaped metal foil. [Figure 8] This is a flowchart showing a preferred embodiment of the method according to the present invention. [Figure 9] This is a flowchart illustrating a further preferred embodiment of the method according to the present invention. [Modes for carrying out the invention]

[0077] Figure 1 schematically illustrates the coating of both sides of a ribbon-shaped metal foil according to the present invention. For coating the first surface of the ribbon-shaped metal foil 100, the example shown herein provides five coating heads 11, 12, 13, 14, and 15, each designed as a single-nozzle coating head and containing a coating nozzle accordingly (partial Figure A). These single-nozzle coating heads 11-15 can each be used to coat tracks 110 or strips of electrode material when coating the ribbon-shaped metal foil 100. Each track 110 forms a strip of electrode material on one surface of the ribbon-shaped metal foil 100. A narrow, uncoated strip-like region 111 is positioned between each of the individual strips 110. All strips are aligned parallel to each other.

[0078] To coat the other side of the ribbon-shaped metal foil 100, this example provides a multi-nozzle coating head 16 including five rigidly arranged coating nozzles, which are provided to apply five parallel strips 120 of electrode material to the other side of the ribbon-shaped metal foil 100 (partial Figure B). Accordingly, narrow, uncoated strip-like regions 121 are provided between the individual parallel strips 120 as well as the other side of the metal foil 100.

[0079] The strips are applied to both sides of the ribbon-shaped metal foil 100 such that strip 110 on one side overlaps with strip 120 on the other side (in a line of sight perpendicular to the metal foil), and the present invention addresses the problem of avoiding offset between strips 110 and 120 on both sides of the metal foil 100.

[0080] To this end, the present invention first provides the simultaneous coating of strips 110 and 120 to both sides of a metal foil 100 in a single operation. Thus, unlike conventional methods, one side is not coated and dried before the other side is coated and dried. Instead, the present invention provides that both sides are coated and preferably dried simultaneously with a temporal overlap.

[0081] In a particularly preferred embodiment, the coating is carried out on one surface of the metal foil 100 using a single nozzle coating head whose position relative to and from the metal foil can accommodate any possible offset.

[0082] Figure 2 shows a preferred embodiment of the device according to the present invention. Several single-nozzle coating heads 11-15 are provided for coating one side (side A). In this cross-sectional view shown in Figure 2, only the single-nozzle coating heads 11 and 12 are shown. The positions of these separately formed coating heads 11 and 12 can be adjusted transversely with respect to the width of the metal foil 100 to be coated, and can respond to any misalignment that may result. The single-nozzle coating heads 11 and 12 or all of the single-nozzle coating heads 11-15 operate in contact with the coating roller 20 to ensure that the electrode material is applied to several tracks (strips) of side A, for example, five tracks (parallel strips 110). The metal foil 100 is guided over the deflection roller 30 and thus reaches the multi-nozzle coating head 16, by which the coating 120 is applied to the other side (side B) of the ribbon metal foil 100 in multiple tracks.

[0083] The metal foil 100, coated on both sides within multiple lanes, continues to advance in the direction of the arrows toward a drying device not shown here. The metal foil 100 can then be cut several times longitudinally, preferably within the uncoated strip-like regions 111, 121 and at the center of the parallel strips 110, 120 of electrode material.

[0084] When five parallel strips are coated onto both sides of the metal foil 100, a total of 10 ribbon-shaped metal foils coated on both sides can be obtained, each of which has a region extending along one of its longitudinal edges that is not covered on both sides by the electrode material and can be used to contact the electrode strips.

[0085] The adjustability of the flexible single-nozzle coating heads 11-15 used to coat surface A in the example shown in Figure 2 means that if an offset occurs during coating of strips 110, 120 on both sides of the metal foil, the coating to surface A can be corrected so that the track offset is reliably corrected and thus avoided.

[0086] Figure 3 shows an isometric view of the device schematically shown in cross-section in Figure 2. The single-nozzle coating heads 11-15 are offset and arranged in two rows. The single-nozzle coating heads 11, 13, and 15 are arranged in the first row, while the coating heads 12 and 14 are arranged offset in the second row. In this remarkably space-saving arrangement of the single-nozzle coating heads 11-15, the single-nozzle coating heads 11-15 can be adjusted transversely with respect to the direction of travel of the ribbon-shaped metal foil without interfering with each other, thereby allowing track coating on plane A, located above track 110, if offset occurs between tracks 110 and in track 120 on the opposite side of the metal foil 100, which is not visible here.

[0087] Not shown herein is a sensor system for measuring any track offset that may occur between tracks or strips 110 and 120. For example, several cameras can be provided for this purpose to monitor the track coating on both sides of the metal foil 100.

[0088] Figure 4 shows a further embodiment of a device suitable for double-sided coating according to the present invention. Similar to the device shown in Figure 2, the schematic cross-sectional view shown here also shows two flexible single-nozzle coating heads 11 and 12 constructed to interact with a coating roller 20 for coating side A of a ribbon-shaped metal foil 100. Not visible here are other single-nozzle coating heads 13, 14 and 15 distributed across the width of the metal foil 100 to be coated and assigned to side A of the metal foil 100. These single-nozzle coating heads 11-15 ensure multi-track coating in the form of several parallel strips 110 on side A of the metal foil 100. Here again, the metal foil 100, already coated on one side, is guided via a deflection roller 30 to a multi-nozzle coating head 16 for coating side B of the metal foil 100 to form parallel strips 120 of electrode material on side B of the metal foil 100. In contrast to the device schematically shown in cross-section in Figure 2, the device in Figure 4 has a larger deflection angle for the metal foil 100 to be coated, due to the coating roller 20. The flexible single-nozzle coating heads 11-15 are aligned at different angles relative to the curvature of the metal foil 100.

[0089] Figure 5 shows an isometric view of the device in Figure 4, with corresponding reference numerals. Equivalent to the figure in Figure 3, the offset arrangement of the single nozzle coating heads 11-15 in two rows with respect to the direction of travel of the metal foil 100 to be coated can be seen.

[0090] Figure 6 shows a schematic cross-sectional view of a further embodiment of the device according to the present invention for coating both sides of a ribbon-shaped metal foil 100. In this embodiment, a plurality of flexible single-nozzle coating heads are provided on both one side (side A) and the other side (side B). In this embodiment, for example, two single-nozzle coating heads 11, 12 and 17, 18 are shown in each case, representing five single-nozzle coating heads arranged offset from each other.

[0091] The single nozzle coating heads 11, 12 and 17, 18 operate in contact with the coating rollers 20 or 40, respectively, to ensure that the electrode material is applied to several tracks (strips), for example, five tracks (parallel strips 110), of the A-side and then the B-side. In this example, the B-side coating is also carried out in contact with the coating rolls, thus providing upstream drying of the A-side.

[0092] This configuration is a tandem coater having two multi-lane coating head zones, so that within at least one of these zones, the coating heads 11, 12 and 17, 18 can be moved perpendicular to the metal foil transport direction to enable flexible track offset correction.

[0093] Sensor 25 may be used to check whether the stripe is offset from the target position when applying the coating to surface A. Sensor 26 may be used to check whether strip offset occurs when applying the coating to surface B. The sensors could be, for example, cameras.

[0094] In this embodiment, before the coating of side B is performed, the metal foil 100, which has already been coated on one side, passes through the first drying device 50 before the metal foil coated on one side is guided via the deflection roller 60 into the area having coating heads 17, 18 for multi-track coating of side B.

[0095] The metal foil 100, coated on both sides and within multiple tracks, continues to advance in the direction of the arrows over further rolls 70 to further drying devices 80. Subsequently, if required after calendering (compacting) of the electrode material, the metal foil 100 may be cut several times longitudinally, preferably within uncoated strip-like regions 111, 121 and in the middle of parallel strips 110, 120 of electrode material.

[0096] Intermediate drying of surface A has the significant advantage that the (deflection) roller can also engage with the already coated surface A, thereby allowing the coating nozzles for both surfaces A and B to coat from the side or from above, and the metal foil can be guided so that it does not have to work from below, i.e., against gravity.

[0097] Figure 7 shows a further embodiment of the device according to the present invention, which is largely equivalent to the embodiment shown in Figure 3. The corresponding elements of the device are given the same reference numerals.

[0098] In contrast to the embodiment shown in Figure 3, the single-nozzle coating heads 11, 12, 13, 14, and 15 can also be moved perpendicular to the track plane (indicated by double arrows). This enables and / or facilitates intermittent coating during coating of track 110. Preferably, the individual single-nozzle coating heads 11, 12, 13, 14, and 15 can also be moved independently of each other in this direction, thereby allowing them to be individually raised and lowered depending on the pattern being coated. Figure 8 shows a preferred embodiment of the method according to the present invention in the form of a flow chart. The features of the method, described as individual steps, should be understood as the steps proceeding in parallel within a single pass of the method of coating both sides of a metal foil, so that the metal foil being coated progresses continuously through the coating method as an endless belt, so to speak. The sequence of steps reflects the spatial arrangement of the corresponding device components for carrying out the steps within the coating device, e.g., the corresponding coating heads.

[0099] After a ribbon-shaped metal foil is provided in step 201, a strip-shaped coating is applied to the first surface of the metal foil in a continuous process (step 202), and then a strip-shaped coating is applied to the second surface of the metal foil (step 203). Steps 202 and 203 are performed simultaneously by positioning corresponding coating heads on both sides of the metal foil as the metal foil passes, and applying the coating to both sides of the metal foil at a spatial distance from each other as the metal foil passes, if necessary. In step 204, it is checked whether a strip offset occurs between the coatings on both sides of the metal foil during the pass, and / or, if a detectable strip offset occurs, whether it exceeds a predetermined threshold. This determination of the strip offset is specifically performed using one or more sensors. If a strip offset or a strip offset exceeding a predetermined threshold is detected (step 205), in step 206, the position of the coating head is corrected for coating the second surface of the metal foil (step 203) while the coating is progressing. In step 204, if no strip offset is detected, or if a strip offset below a predetermined threshold is detected, the coating of the metal foil can continue without changing the parameters.

[0100] Figure 9 shows a further preferred embodiment of the method according to the present invention in flowchart form. Similar to the flowchart in Figure 8, the features of the method, described as individual steps, should be understood to be that the steps proceed in a temporally overlapping manner within a single pass of the method of coating both sides of a metal foil, thereby ensuring that the metal foil being coated progresses continuously through the coating method as effectively an endless belt. The sequence of steps reflects the spatial arrangement of the corresponding device components for carrying out the steps within the coating device.

[0101] After a ribbon-shaped metal foil is provided in step 301, a strip-shaped coating is applied to a first surface of the metal foil in a continuous process (step 302). In step 303, the strip boundary and / or strip position are determined for the coating already applied to the first surface. In step 304, a second surface of the metal foil is coated within the strip. Steps 302 and 304 are preferably performed simultaneously, as the coating head is applied to both sides of the metal foil and, if necessary, the coating is applied in a single pass of the metal foil at a spatial distance from each other. The data determined in step 303 may be incorporated in step 305 into position correction of the coating head for the strip-shaped coating on the second surface of the metal foil in step 304. In step 306, it is checked whether a strip offset occurs during the application of the coating to the second surface, and / or, if a strip offset can be detected, whether it exceeds a predetermined threshold. If a strip offset or a strip offset exceeding a predetermined threshold is detected (step 307), this is included in the position correction of the coating head for coating the second surface of the metal foil (step 304) (step 305). In step 306, if no strip offset is detected or if a strip offset below a predetermined threshold is detected, the coating of the metal foil can be continued without changing the parameters.

[0102] The determination of the strip offset in step 303 and the determination of the strip boundary and / or strip position in step 306 are specifically carried out using one or more sensors, for example, a camera or an edge sensor.

Claims

1. A method for manufacturing a ribbon-shaped electrode, which includes a ribbon-shaped current collector having a region on both sides that is not covered by the electrode material and extends along one of its longitudinal edges, wherein the ribbon-shaped current collector is covered on both sides by a layer of electrode material, a. A method for providing a ribbon-shaped metal foil (100), b. A method step in a continuous process for coating a ribbon-shaped metal foil (100) with an electrode material, wherein a coating nozzle coats a plurality of parallel strips (120) of the electrode material onto a first surface of the ribbon-shaped metal foil (100), and an equal number of parallel strips (110) of the electrode material onto a second surface of the ribbon-shaped metal foil (100), so that in a line of sight perpendicular to the ribbon-shaped metal foil (100), one strip on the first surface (120) in each case overlaps with one of the strips on the second surface (110) of the ribbon-shaped metal foil (100), and on both sides between directly adjacent parallel strips (110, 120) of the electrode material, the uncoated strip-like regions (111, 121) remain free of the electrode material. In a method including, c. The parallel strips (110, 120) of the electrode material are applied simultaneously to the first and second surfaces of the ribbon-shaped metal foil (100), d. Whether an offset occurs between overlapping strips (110, 120) on the first surface and the second surface, and / or whether the offset exceeds a predetermined threshold, e. If an offset occurs between overlapping strips (110, 120) on the first surface and the second surface, and / or if the offset exceeds the predetermined threshold, at least one position of the coating nozzle relative to the ribbon-shaped metal foil (100) is corrected. f. A plurality of corresponding adjustable single-nozzle coating heads are provided on both sides of the first and second surfaces of the ribbon-shaped metal foil (100). g. The strip (120) of the electrode material is coated onto the first surface of the ribbon-shaped metal foil (100) by a plurality of single-nozzle coating heads provided on the first surface, each having a coating nozzle and whose position relative to each other can be changed. h. The strip (110) of the electrode material is applied to the second surface of the ribbon-shaped metal foil (100) by a plurality of single-nozzle coating heads provided on the second surface, each having a coating nozzle and whose position relative to each other can be changed. i. Each of the plurality of single-nozzle coating heads provided on the first surface and the plurality of single-nozzle coating heads provided on the second surface is displaceable perpendicular to the direction of passage of the ribbon-shaped metal foil (100). i. The correction is performed by displacing each of the plurality of single nozzle coating heads provided on the first surface and the plurality of single nozzle coating heads provided on the second surface perpendicular to the direction of passage of the ribbon-shaped metal foil (100), A method characterized by the following.

2. The following additional features: a. In order to detect possible offsets between overlapping strips (110, 120) on the first and second surfaces of the ribbon-shaped metal foil (100), at least one distance of the strips (110, 120) from the longitudinal edge of the ribbon-shaped metal foil (100) and / or a change in said distance is detected. b. In order to detect possible offsets between overlapping strips (110, 120) on the first and second surfaces of the ribbon-shaped metal foil (100), at least one distance of the strips (110, 120) from an adjacent strip and / or a change in said distance is detected. c. In order to detect possible offsets between overlapping strips (110, 120) on the first and second surfaces of the ribbon-shaped metal foil (100), the centerlines of the strips (110, 120) and / or changes in the centerlines are detected. The method according to claim 1, characterized by at least one of the following.

3. The following additional features: a. After coating both sides of the ribbon-shaped metal foil, the strip of electrode material is dried. b. The electrode material is dried in an air-flow dryer. The method according to claim 1, characterized by at least one of the following.

4. The following additional features: a. After both sides of the ribbon-shaped metal foil (100) are coated and / or after the electrode material has dried, the ribbon-shaped metal foil (100) coated with the electrode material is cut longitudinally to form the ribbon-shaped electrode. b. In order to cut the ribbon-shaped metal foil (100), the foil is cut in the longitudinal direction, and the cutting is performed through at least one of the uncoated strip-like regions (111, 121) located between adjacent strips (110, 120) of the electrode material. c. In order to cut the ribbon-shaped metal foil (100), the foil is cut in the longitudinal direction, and the cutting is performed through at least one of the strips (110, 120). The method according to claim 1, characterized by at least one of the following.

5. A device for manufacturing a ribbon-shaped electrode, which includes a ribbon-shaped current collector having a region on both sides that is not covered by the electrode material and extends along one of its longitudinal edges, and having the following features: a. The device includes a conveyor section for transporting a ribbon-shaped metal foil (100) having first and second surfaces in a direction parallel to the longitudinal direction of the metal foil (100), b. The device includes a plurality of coating nozzles that serve to coat the first surface and the second surface of the ribbon-shaped metal foil (100) with an electrode material and are positioned accordingly. c. The plurality of coating nozzles are positioned such that a plurality of parallel strips (120) of the electrode material can be coated onto the first surface of the ribbon-shaped metal foil (100), and an equal number of parallel strips (110) of the electrode material can be coated onto the second surface of the ribbon-shaped metal foil (100), so that in each case, in a line of sight perpendicular to the ribbon-shaped metal foil (100), one strip on the first surface (120) overlaps with one of the strips on the second surface (110) of the ribbon-shaped metal foil (100), and on both sides between directly adjacent parallel strips (110, 120) of the electrode material, the uncoated strip-like regions (111, 121) remain free of the electrode material. d. The device is configured to simultaneously coat the first surface and the second surface of the ribbon-shaped metal foil (100) with the coating nozzle, e. The device is constructed to be capable of detecting whether an offset occurs between overlapping strips (110, 120) on the first and second surfaces, and / or whether the offset exceeds a predetermined threshold, f. The device is provided with a plurality of corresponding adjustable single-nozzle coating heads on both sides of the first and second surfaces of the ribbon-shaped metal foil (100). g. The plurality of single-nozzle coating heads provided on the first surface are a plurality of single-nozzle coating heads each having a coating nozzle and whose position relative to each other can be changed, and which are aligned to coat the first surface of the ribbon-shaped metal foil (100), h. The plurality of single-nozzle coating heads provided on the second surface are a plurality of single-nozzle coating heads each having a coating nozzle and whose position relative to each other can be changed, and which are aligned to coat the second surface of the ribbon-shaped metal foil (100), i. Each of the plurality of single-nozzle coating heads provided on the first surface and the plurality of single-nozzle coating heads provided on the second surface is displaceable perpendicular to the direction of passage of the ribbon-shaped metal foil (100). j. When each of the plurality of single-nozzle coating heads provided on the first surface and the plurality of single-nozzle coating heads provided on the second surface is displaced perpendicular to the direction of passage of the ribbon-shaped metal foil (100), resulting in an offset between overlapping strips (110, 120) on the first surface and the second surface, and / or when the offset exceeds the predetermined threshold, the position of at least one of the coating nozzles relative to the ribbon-shaped metal foil (100) is corrected. A device that includes this.

6. The following additional features: a. The plurality of single nozzle coating heads provided on the first surface are arranged offset from each other with respect to the direction of passage of the ribbon-shaped metal foil (100) to be coated, and the plurality of single nozzle coating heads provided on the second surface are arranged offset from each other with respect to the direction of passage of the ribbon-shaped metal foil (100) to be coated. b. The plurality of single nozzle coating heads provided on the first surface are arranged in two rows perpendicular to the direction of passage of the ribbon-shaped metal foil (100) to be coated, and the plurality of single nozzle coating heads provided on the second surface are arranged in two rows perpendicular to the direction of passage of the ribbon-shaped metal foil (100) to be coated. The device according to claim 5, characterized by at least one of the following.

7. The following additional features: a. The device includes a sensor system for detecting possible offsets between overlapping strips (110, 120) on the first and second surfaces of the ribbon-shaped metal foil (100). b. The device includes a drying device for the coated ribbon-shaped metal foil (100). c. The device includes a cutting device for cutting the coated ribbon-shaped metal foil (100) in the longitudinal direction. The device according to claim 5 or 6, characterized by at least one of the following.

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