Method and device for manufacturing ribbon electrodes

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]

[0001] The present invention relates to a method for producing a ribbon electrode comprising a ribbon-shaped current collector coated on both sides with a layer of electrode material, the ribbon-shaped current collector having on both sides an area extending along one of its longitudinal edges that is not coated with electrode material, and further to a device for producing such an electrode as well as the use of such electrodes and electrochemical energy storage elements that can be produced therewith. [Background technology]

[0002] Electrochemical energy storage elements are capable of converting stored chemical energy into electrical energy by oxidation-reduction reactions. The simplest form of electrochemical energy storage element is the electrochemical cell. It comprises 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 electronic current that can be drawn by an external power consumer, for which the electrochemical cell acts as an energy supplier. At the same time, an ionic current corresponding to the electrode reactions is generated in the cell. This ionic current crosses the separator and is enabled by an ionically conductive electrolyte.

[0003] If the discharge of an electrochemical energy storage element is reversible, i.e., it is possible to reverse the conversion of chemical energy to electrical energy during discharge and recharge the cell or element, it is said to be a secondary element. For secondary elements, the common designation of the negative electrode as the anode and the positive electrode as the cathode refers 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 made up of a number of individual electrochemical cells.

[0005] WO 2017 / 215900 A1 describes a cylindrical circular cell in which an assembly in the form of a winding is formed from ribbon-like electrodes. The electrodes each have a current collector on which the electrode material is placed. The electrodes of opposite polarity are arranged offset from each other in the assembly, so that the longitudinal edge of the positive current collector protrudes from one end face and the longitudinal edge of the negative current collector protrudes from the second end face of the winding. For electrical contact of the current collectors, the cell has a contact plate that sits on the end face of the winding and is connected by welding to the longitudinal edge of the protruding current collector. This allows electrical contact over its entire length with the current collector and therefore also with the associated electrode. This significantly reduces the internal resistance in the aforementioned cell. As a result, the generation of high currents can be absorbed much better and also heat can be dissipated better from the winding.

[0006] To ensure good connection of the longitudinal edges of the current collector to the contact plates in such cells, it is advantageous to form the windings using ribbon electrodes that do not contain electrode material along one of their longitudinal edges, i.e. the longitudinal edge that is to be contacted. These ribbon electrodes thus comprise ribbon current collectors coated on both sides with a layer of positive or negative electrode material, and along one of their longitudinal edges, they have an area where it 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 area.

[0007] It is known to manufacture such ribbon electrodes with a coating process in which a paste-like electrode material is applied to a current collector. The current collector is usually a ribbon-like metal foil. The electrode material is applied using a slot die, for example as described in EP 3608028 B1. Generally, first one side of the ribbon-like metal foil is 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 further step, the second side of the ribbon-like metal foil is coated with the same electrode material, again in the form of a strip, and dried.

[0008] It is important that the strips of electrode material are ideally applied on both sides of the current collector without any offset, i.e. in such a way that the strips on both sides completely overlap in the line of sight perpendicular to the ribbon-like metal foil. In particular, the areas on both sides of the current collector that are not covered with electrode material must also have a constant width along each longitudinal edge over the entire length of the electrode. This is difficult to achieve in the tandem process described above, and the required precision is often not achieved.

[0009] It is also known to apply several parallel strips of electrode material onto both sides of a ribbon-shaped metal foil to produce electrode strips with free edge areas and then cut the foil, for example between the strips, so that several ribbon-shaped electrodes result from the coated ribbon-shaped metal foil, but this procedure also presents the problem of misalignment between the strips on different sides of the current collector.

[0010] To solve these problems, it has been considered to mask the areas of the metal foil that are not to be coated with the electrode material and to remove the masking after coating is completed. However, this procedure is very time consuming, since an additional step to remove adhesive residues would also typically be required. Another approach involves subsequent removal, for example by laser or mechanically, of the coating in the longitudinal edge regions of the electrode strip.

[0011] Therefore, known prior art methods of manufacturing ribbon electrodes having edge regions free of electrode material have not yet provided a satisfactory solution to achieve the required precision of coating, particularly in mass production, while at the same time keeping costs within acceptable limits. Summary of the Invention [Problem to be solved by the invention]

[0012] Against this background, the present invention has as its object the provision of an improved method for producing ribbon electrodes comprising a ribbon-shaped current collector coated on both sides with electrode material, the ribbon-shaped current collector having an edge region that is not covered with electrode material along one of its longitudinal edges and where, for example, a contact plate is provided for electrical contact. With a view to mass production, it is desirable to produce several ribbon-shaped electrodes in parallel, thereby addressing the problem of track offset between the coated regions of the ribbon-shaped electrodes. The method must therefore enable ribbon-shaped electrodes to be produced with high precision whilst at the same time being suitable for mass production. [Means for solving the problem]

[0013] This object is achieved by the method and device described below. 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 a device for producing a ribbon electrode 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 invention are ribbon electrodes produced according to the described method as well as the use of these ribbon electrodes and electrochemical energy storage elements comprising such ribbon electrodes, as is also evident from the further independent claims.

[0014] The method according to the invention is used to manufacture a ribbon-shaped electrode comprising a ribbon-shaped current collector. The current collector has two faces and is coated on both faces with a layer of electrode material. Furthermore, the current collector has an area on both faces extending along one of its longitudinal edges that is not coated with electrode material. Along this longitudinal edge, the current collector therefore does not contain electrode material on both faces. This area is intended to be in electrical contact with an electrode, for example a contact plate or a housing of an electrochemical energy storage cell or battery.

[0015] A method for manufacturing such a ribbon electrode according to the invention comprises the following method steps: The method steps of: a. providing a ribbon-shaped metal foil. b. A method step of coating a ribbon-shaped metal foil with electrode material in a continuous process, in which by means of an application nozzle a number of parallel strips of electrode material are applied to a first side of the ribbon-shaped metal foil and an equal number of parallel strips of electrode material are applied to a second side 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 side overlaps one of the strips on the second side of the ribbon-shaped metal foil, and on both sides between directly adjacent parallel strips of electrode material, the non-coated strip-like areas remain free of electrode material.

[0016] The method is characterized in particular by the following features: c. Parallel strips of electrode material are simultaneously applied to the first and second sides of the ribbon-shaped metal foil. Simultaneous application means that both sides of the ribbon of metal foil are coated simultaneously in one operation and overlapping in time.

[0017] The process preferably involves coating both sides of the metal foil in a single pass in a coating device, in particular a device for producing ribbon electrodes as described below. Particularly preferably, the coating on both sides can be carried out in a continuous throughput process, in which both sides of the metal foil are coated simultaneously, optionally spatially offset.

[0018] It is preferred not to coat one side of the metal foil first before the coating is applied to the other side in a separate operation, with subsequent drying in each case, as is the case in conventional manufacturing processes. Instead, the method according to the invention provides that the coating of the first and second sides is carried out simultaneously. No multiple handling of the ribbon-like metal foil in a continuous coating operation, including associated winding, unwinding, deflection and calibration operations, is necessary. As a result, possible offset problems between the strips on the first and second sides of the ribbon-like metal foil can be better addressed.

[0019] In conventional methods, offsets of a few tenths of a millimeter of the overlapping strips on both sides of the metal foil are common. Such misalignments have a very detrimental effect on the performance of the electrodes. In addition, non-optimal matching of the strips can lead to problems during the subsequent processing of the electrodes into an energy storage element and the necessary electrical contact of the electrodes. These disadvantages can be avoided with the manufacturing process according to the invention, since the simultaneous coating process improves the accuracy of the strip application.

[0020] In the context of 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 with a sufficiently high electrical conductivity so that it can act as a current collector of an electrode. A ribbon-shaped substrate in this sense can therefore also be a graphite foil or a film-shaped substrate in other forms with a graphitized, metallized or electrically conductive coating for the manufacture of ribbon-shaped electrodes. Other suitable strip-shaped substrates are also substrates based on metal nets or grids or metal foams or nonwovens made of metal filaments or metallized threads. In a particularly preferred embodiment of the method, it is detected whether an offset occurs between the overlapping strips on the first and second sides and / or whether the offset exceeds a predefined threshold value. In a particularly preferred embodiment, the offset of the strips thus detected is corrected by correcting at least one position of the application nozzle relative to the ribbon-shaped metal foil.

[0021] In particularly preferred and advantageous embodiments of the method according to the invention, it is further characterized by at least one of the following additional features a. to c: a. The strip of electrode material shall be applied using an application 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 predefined threshold. c. correcting at least one position of the application nozzle relative to the ribbon-shaped metal foil if an offset between the overlapping strips on the first and second sides occurs and / or if a predefined offset threshold is exceeded. The immediately preceding features a to c are particularly preferably realized 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 sides of the metal foil is detected and / or measured, so that corrective measures can be initiated if necessary. Preferably, the position of at least one of the application nozzles, through which the strips of electrode material are applied, is appropriately corrected for this purpose. In this embodiment of the method, it is therefore provided that the position of one or more application nozzles can be changed. Thus, after a short run-in phase during the coating of both sides of the ribbon-like metal foil, it is possible to ascertain whether a track offset exists, so that interventions and corrections can be made very quickly if necessary. The control distance between the coating of the two sides is preferably so short that the coating tracks can be controlled individually. It can be advantageous if the coating is independent of other parameters such as subsequent drying. This results in a highly accurate, matched double-sided multi-lane coating. In this way, a double-sided multi-lane strip coating can be realized, without any subsequent corrections or subsequent 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. A strip of electrode material is applied to at least one of the faces of a ribbon-shaped metal foil by several single-nozzle coating heads, each having an application nozzle, the positions of which relative to each other can be varied. b. Each of the single nozzle coating heads is displaceable perpendicular to the passing direction of the ribbon-shaped metal foil. It is particularly preferable that the abovementioned features a. and b. are realized in combination with each other.

[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 fixed distance from the metal foil), the distance between the application nozzle and the edge of the metal foil can be changed, thereby enabling the system to react to any offset that may occur during two-sided coating of overlapping strips on both sides of the metal foil, and the position of one or more application nozzles can be corrected.

[0025] In principle, both sides of the ribbon-shaped metal foil could be provided with corresponding adjustable single-nozzle coating heads, so as to enable compensation to be made on both sides of the metal foil during coating.

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

[0027] Preferably, the above-mentioned 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 with a rigid application nozzle or one or more multi-nozzle coating heads comprising several application nozzles at a fixed distance from each other, while on the other side, the coating of the ribbon-shaped metal foil is carried out with flexible application nozzles, in particular with several single-nozzle coating heads whose position can be changed.

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

[0029] The first and second sides mentioned here are in principle interchangeable: thus, when coating a metal foil, a rigid application nozzle can be assigned to both sides A and B, and a flexible application nozzle can be assigned to both sides B and A.

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

[0031] Both the application nozzles of the multi-nozzle coating head and the application nozzles of the single-nozzle coating head can be designed according to EP 3608028 B1.

[0032] The detection of a possible offset between the overlapping strips on the first and second sides of the ribbon-shaped metal foil can be carried out in different ways. Particularly preferred is the use of a sensor system that is able to detect this offset in an automated manner. In preferred embodiments of the method, at least one of the following additional features can be realized in this respect: a. detecting at least one distance of the strip from a longitudinal edge of the ribbon-shaped metal foil and / or a change in this distance in order to detect a possible offset between overlapping strips on the first and second sides of the ribbon-shaped metal foil; b. detecting a distance and / or a change in said distance of at least one of the strips from an adjacent strip in order to detect a possible offset between overlapping strips on the first and second sides of the ribbon-shaped metal foil; c. The centerlines and / or changes in centerlines of the strips are detected to detect possible offsets between overlapping strips on the first and second sides of the ribbon-shaped metal foil. In a preferred embodiment, the above-mentioned features a to c can be realized alternatively, but preferably, two or three of the above-mentioned features a to c, in particular features a and b, can be realized 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 the like may be used. Another possibility is, for example, the measurement of light reflection, since coated and uncoated areas of the metal foil can be clearly distinguished from one another by their reflection properties.

[0034] In a further preferred embodiment of the method according to the invention, it can be provided that the position and / or the borders of the strip applied to the first side of the metal foil are already determined after the coating of the first side, preferably by means of a sensor system, and this information can be taken into account in the alignment and / or in the position correction of the application nozzle for the coating of the second side.

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

[0036] In general, it is expedient to dry the electrode materials immediately after they have been applied to the ribbon-shaped metal foil. Such drying is known in principle. The method according to the 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. overlapping in time in the same work step. As a result, exactly the same conditions prevail for drying the coating on both sides of the ribbon-shaped metal foil, so that no further tolerances arise in the coating on both sides and therefore no further tolerances arise in the trace application due to simultaneous drying. This measure also further improves the production of highly accurate and consistent strips of electrode material on both sides of the metal foil. In addition, the simultaneous drying of the coating improves the energy balance of the method.

[0037] The use of a flash dryer for drying is particularly advantageous since there is no contact between the metal foil, which has just been coated on both sides, and e.g. rollers or the like For example, a vacuum plate together with air nozzles can be used for the flash dryer in a manner known per se.

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

[0039] In particular, the coating process according to the invention can also be applied in so-called tandem coating processes. Preferably, the position or boundary of the coating track on the first side of the metal foil is determined after leaving the first drying stage and used for alignment of the application nozzle of the second coating stage, so that the offset of the coating track on the first side relative to the coating track applied to the second side of the metal foil is minimized.

[0040] When several strips of electrode material are applied to a ribbon-shaped metal foil, it may be desirable to cut the coated metal foil longitudinally to provide ribbon-shaped electrodes of the desired widths fabricated from the metal foil.

[0041] In particularly preferred embodiments of the method according to the invention, at least one of the following additional features is provided: a. After coating both sides of the ribbon-shaped metal foil and / or drying the electrode material, the ribbon-shaped metal foil coated with the electrode material is cut, specifically cut in the longitudinal direction, to form a ribbon-shaped electrode; b. to cut the ribbon-shaped metal foil, the foil is cut longitudinally, whereby the cut is made through at least one of the non-coated strip-shaped regions disposed between adjacent strips of electrode material; c. To cut the ribbon-like metal foil, the foil is cut lengthwise, cutting through at least one of the strips. Preferably, the above-mentioned features a. to c. are realized in combination with each other.

[0042] In these embodiments, the non-coated strip-like regions between adjacent strips of electrode material are preferably split, specifically cut, longitudinally at their centers, such that the strips of electrode material are split longitudinally at their centers, whereby several electrodes may be provided from the metal foil, after which the required lengths of ribbon-like electrodes may be cut accordingly, 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 size of ribbon-shaped electrodes to be produced. Preferably, two, three, four or five strips can be applied congruently on both sides of the metal foil. For example, two ribbon-shaped electrodes can be obtained from a two-lane strip of electrode material applied on both sides by cutting once in the longitudinal direction.

[0044] Particularly preferably, for example, 3 to 8 strips of electrode material can be applied onto both sides of a ribbon-shaped metal foil, whereby 6 to 16 electrode strips can be cut therefrom, which can then be cut to different lengths depending on the size of the energy storage cell to be produced.

[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 known to those skilled in the art for the manufacture of electrochemical energy storage elements can be used as materials for the ribbon electrodes. For example, conventional anode and cathode electrode materials can be used as electrode materials, whereby a ribbon-shaped metal foil is coated on both sides with the anode electrode material or coated on both sides with the cathode electrode material.

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

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

[0049] In principle, all materials capable of absorbing and releasing lithium ions may be used as electrochemically active components (active materials) for secondary lithium-ion cells. For example, carbon-based particles such as graphitic carbon are used in the negative electrode. In particular, metal oxide compounds capable of reversibly intercalating lithium, such as lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4) or derivatives thereof, may be used as active materials in the positive electrode. The electrode materials used in connection with the present invention may include these electrochemically active materials, particularly in particulate form.

[0050] A further component of the composite electrode is the current collector, which in the ribbon electrode produced according to the invention is formed in the form of a strip from the ribbon-shaped metal foil. The current collector serves as a carrier for the respective active material. The current collector of the negative electrode (anode current collector) can be made, for example, of copper or nickel, and the current collector of the positive electrode (cathode current collector) can be made, for example, of aluminum. Thus, the metal foil coated with the electrode material as part of the method according to the invention also preferably consists of aluminum, nickel or copper.

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

[0052] The present invention further includes a device for manufacturing the ribbon electrode described above, the device comprising the following features: a. the device includes a conveyor section for conveying a ribbon of metal foil having first and second surfaces in a passing direction parallel to a longitudinal direction of the metal foil; b. the device includes a plurality of application nozzles serving to coat the first side of the ribbon-shaped metal foil and the second side of the ribbon-shaped metal foil with an electrode material and positioned accordingly; c. the application nozzle is positioned such that a plurality of parallel strips of electrode material can be applied to a first side of the ribbon-shaped metal foil, and an equal number of parallel strips of electrode material can be applied to a second side of the ribbon-shaped metal foil, such that, in a line of sight perpendicular to the ribbon-shaped metal foil, one strip on the first side overlaps one of the strips on the second side of the ribbon-shaped metal foil, and on both sides between immediately adjacent parallel strips of electrode material, the non-coated strip-like regions remain free of electrode material; d. The device is constructed to simultaneously coat the first and second sides of the ribbon-shaped metal foil with a coating nozzle.

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

[0054] In a particularly preferred aspect, the device is constructed such that it is capable of detecting whether an offset occurs between overlapping strips on the first and second sides and / or whether the offset exceeds a predefined threshold, whereby any offset that may occur can be corrected, preferably by correcting the position of one or more application nozzles.

[0055] In particular, application nozzles constructed to coat the first and / or second sides of a metal foil may be assigned opposing coating rollers, whereby the application nozzle is positioned on one side and the coating roller is positioned on the other side, whereby the coating roller applies a counter pressure to the metal foil during the coating process.

[0056] The application nozzles for coating one side and for coating the other side are preferably arranged offset from one another 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 bring the ribbon-shaped metal foil into a suitable position for coating.

[0057] With regard to the application nozzle for the coating, the device is in a particularly preferred embodiment characterized by at least one of the following features: a. the device includes several single-nozzle coating heads, each having an application nozzle, the positions of which can be changed relative to one another; b. The single nozzle coating head is displaceable perpendicular to the direction of passage of the ribbon-shaped metal foil. Preferably, the immediately preceding features a. and b. are realised in combination with each other.

[0058] These preferably displaceable single-nozzle coating heads are preferably provided in the device only on one side of the ribbon-shaped metal foil to be coated. In principle, however, single-nozzle coating heads whose positions can be changed relative to one another can also be provided for coating on both sides of the metal foil. The embodiment having variable single-nozzle coating heads for both sides of the metal foil can be significantly advantageous under certain circumstances, since it allows for significant flexibility in the correction of any track offsets that may occur.

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

[0060] Preferably, the above-mentioned features a. and b. are realized in combination with each other, whereby the rigidly arranged coating nozzle is assigned to one side of the metal foil passing through the device, and the application nozzle of the above-mentioned single-nozzle coating head is assigned to the other side of the metal foil. In particular, with this embodiment of the device, it is possible in a simpler way to react to any offset that may occur between the overlapping strips on both sides of the ribbon-like metal foil and to adjust the position of the application nozzle on one side of the ribbon-like metal foil accordingly. For this purpose, the device advantageously comprises a corresponding device for shifting the position of the single-nozzle coating head so as to avoid offsets between the applications of electrode material on both sides of the ribbon-like metal foil.

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

[0062] These arrangements of the single-nozzle coating head allow for a significantly space-saving arrangement of the single-nozzle coating head while at the same time ensuring lateral freedom of movement or displaceability of the application nozzle relative to the passing direction of the ribbon-shaped metal foil.

[0063] In a further preferred embodiment of the device according to the invention, it can be provided that the application nozzles, and in particular the single-nozzle coating heads, can also be moved perpendicular to the plane of the metal foil and can therefore be raised and lowered again as required. This allows and / or facilitates intermittent coating when applying tracks to the metal foil. Preferably, the individual single-nozzle coating heads can also be moved independently of each other in this direction, so that they can be raised and lowered individually depending on the pattern to be applied.

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

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

[0066] Details of the sensor system and the drying device have already been described in connection with the method according to the invention, whereby reference is made to the corresponding description.

[0067] The device preferably also comprises a device, for example a control unit, for evaluating the measured values ​​recorded by the sensor system and converting these into a correction for the position of the application nozzle.

[0068] The cutting device may be, for example, a conventional cutting device cooperating with a suitable blade or laser.

[0069] The present invention further includes a control program for a device for manufacturing a ribbon electrode in the above-mentioned manner, the control program being constructed to implement the method for manufacturing a ribbon electrode as described above. In particular, the control program can be used to correct the position of the application nozzle for coating in case of any offset occurring in the overlapping strips of electrode material applied on both sides of the ribbon metal foil.

[0070] The present invention further includes ribbon electrodes manufactured by the above-mentioned method, for further details of these ribbon electrodes, reference is made to the above description.

[0071] Furthermore, the present invention includes the use of a ribbon electrode produced by the method according to the present invention for producing an electrochemical energy storage element, in particular an electrochemical energy storage cell or battery composed of a plurality of electrochemical energy storage cells, said energy storage element also being included in the present invention.

[0072] When manufacturing the electrochemical energy storage element, the ribbon electrodes are preferably contacted via the edge areas of the electrode strips that do not contain electrode material, for example, contact plates can be provided for contacting the electrodes or other elements of the housing of the energy storage element can be used for contacting the electrodes.

[0073] In a particularly preferred embodiment, the ribbon electrodes are used to manufacture lithium ion cells.

[0074] For further characteristics of the ribbon electrodes according to the invention, which are part of these electrochemical energy storage elements, and for the method of manufacturing these ribbon electrodes, reference is made to the above description.

[0075] Further features and advantages of the invention become apparent from the following description of examples in conjunction with the drawings. The individual features can be realized individually or in combination with one another. [Brief description of the drawings]

[0076] [Figure 1] Schematic diagram of five single-nozzle coating heads (partial view A), each having an application nozzle for coating a first side of a ribbon-shaped metal foil, and schematic diagram of a multi-nozzle coating head (partial view B), each having five application nozzles for coating a second side of a ribbon-shaped metal foil. [Diagram 2] FIG. 2 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. [Diagram 3] FIG. 3 is an isometric view of a device according to the invention, according to the embodiment of the device shown in FIG. 2. [Figure 4] FIG. 2 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. [Diagram 5] FIG. 5 is an isometric view of a device according to the invention, according to the embodiment shown in FIG. 4. [Figure 6] 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] FIG. 2 is an isometric view of a further embodiment of a device according to the invention for continuous, multi-lane and simultaneous coating of both sides of a ribbon-shaped metal foil. [Figure 8] FIG. 1 is a flow diagram illustrating a preferred embodiment of the method according to the present invention. [Figure 9] FIG. 2 is a flow diagram illustrating a further preferred embodiment of the method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0077] FIG. 1 shows diagrammatically the coating of both sides of a ribbon-shaped metal foil according to the invention. For the coating of the first side of the ribbon-shaped metal foil 100, in the example shown here, five coating heads 11, 12, 13, 14, 15 are provided, each designed as a single-nozzle coating head and each including an application nozzle accordingly (partial view A). These single-nozzle coating heads 11-15 can each be used to apply 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 side of the ribbon-shaped metal foil 100. Between each of the individual strips 110 a thin non-coated strip-like area 111 is arranged. All strips are aligned parallel to one another.

[0078] To coat the other side of the ribbon-shaped metal foil 100, in this example a multi-nozzle coating head 16 is provided (partial view B) which includes five rigidly arranged application nozzles, which are provided to apply five parallel strips 120 of electrode material to the other side of the ribbon-shaped metal foil 100. Accordingly, thin non-coated strip-like areas 121 are provided between the individual parallel strips 120 as well as on the other side of the metal foil 100.

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

[0080] To this end, the present invention provides for the first time the simultaneous application of strips 110 and 120 to both sides of metal foil 100 in one operation, so that, unlike conventional methods, one side is not first coated and dried before the other side is coated and dried. Instead, the present invention provides that both sides are coated simultaneously, overlapping in time, and preferably also dried simultaneously.

[0081] In a particularly preferred embodiment, the coating is performed on one side of the metal foil 100 with a single nozzle coating head whose position relative to the metal foil and relative to each other can be adapted to any offsets that may occur.

[0082] FIG. 2 shows a preferred embodiment of the device according to the invention. Several single-nozzle coating heads 11-15 are provided for coating one side (side A). In this cross-sectional view shown in FIG. 2, only the single-nozzle coating heads 11 and 12 are shown. The position 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, thereby making it possible to react to any misalignment that may occur. The single-nozzle coating heads 11 and 12 or all the single-nozzle coating heads 11-15 work against the coating roller 20 to ensure that the electrode material is applied to the ribbon-like metal foil 100 in several tracks (strips) of side A, for example five tracks (parallel strips 110). The metal foil 100 is guided over the deflection roller 30 so as to reach the multiple-nozzle coating head 16, which applies the coating 120 to the other side (side B) of the ribbon-like metal foil 100 in several tracks as well.

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

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

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

[0086] FIG. 3 shows an isometric view of the device shown diagrammatically in cross section in FIG. 2. The single-nozzle coating heads 11-15 are arranged in two rows, offset. The single-nozzle coating heads 11, 13 and 15 are arranged in a first row, while the coating heads 12 and 14 are arranged offset in a second row. This extremely space-saving arrangement of the single-nozzle coating heads 11-15 allows the single-nozzle coating heads 11-15 to be adjusted transversely to the running direction of the ribbon-like metal foil without interfering with each other, so that in case of offsets occurring between the tracks 110 and in the track 120, not visible here, on the opposite side of the metal foil 100, the track application can be corrected on the A side, here arranged on top of the track 110.

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

[0088] Figure 4 shows a further embodiment of a device suitable for double-sided coating according to the invention. Comparable to the device shown in figure 2, in the schematic cross-section shown here also one can see two flexible single-nozzle coating heads 11 and 12 constructed to interact with a coating roller 20 for coating the A-side of the ribbon-shaped metal foil 100. Not visible here are other single-nozzle coating heads 13, 14 and 15 distributed over the width of the metal foil 100 to be coated and assigned to the A-side of the metal foil 100. These single-nozzle coating heads 11-15 ensure a multi-track coating in the form of several parallel strips 110 on the A-side of the metal foil 100. Here too, the metal foil 100 already coated on one side is guided via a deflection roller 30 to a multiple-nozzle coating head 16 for coating the B-side of the metal foil 100 in order to form parallel strips 120 of electrode material on the B-side of the metal foil 100. In contrast to the device shown diagrammatically 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 of Figure 4, to which corresponding reference numbers have been given. Equivalent to the view in Figure 3, one can see the offset arrangement of the single-nozzle coating heads 11-15 in two rows relative to the running direction of the metal foil 100 to be coated.

[0090] 6 shows in a schematic cross-section a further embodiment of a device according to the invention for coating both sides of a ribbon-shaped metal foil 100. In this embodiment, a number of flexible single-nozzle coating heads are provided both on one side (side A) and on 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, which represent five single-nozzle coating heads arranged offset from one another in each case.

[0091] Single nozzle coating heads 11, 12 and 17, 18 operate against coating rollers 20 or 40, respectively, ensuring that electrode material is applied to the ribbon-like metal foil 100 in several tracks (strips) on side A and then on side B, e.g. five tracks (parallel strips 110). In this example, the coating of side B is also performed against the coating roll, thus providing upstream drying of side A.

[0092] This arrangement is a tandem coater with two multi-lane coating head zones whereby 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 allow for flexible track offset correction.

[0093] Sensor 25 may be used to see if the stripes are offset from the target position when the coating is applied to side A. Sensor 26 may be used to see if strip offset occurs when the coating is applied to side B. The sensor may be, for example, a camera.

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

[0095] The metal foil 100, coated on both sides and in multiple tracks, continues in the direction of the arrow over a further roll 70 to a further drying device 80. Thereafter, if necessary after calendering (consolidation) of the electrode material, the metal foil 100 can be cut longitudinally, preferably several times, in the uncoated strip-like regions 111, 121 and in the middle of the parallel strips 110, 120 of electrode material.

[0096] Intermediate drying of side A has the significant advantage that a (deflection) roller can also engage with the already coated side A, whereby the application nozzle for both side A and side B can apply from the side or from above and the metal foil can be guided from below, i.e. without having to work against gravity.

[0097] Figure 7 shows a further embodiment of the device according to the invention, which is largely equivalent to the embodiment shown in figure 3. Corresponding elements of the device have been given the same reference signs.

[0098] In contrast to the embodiment shown in FIG. 3, the single-nozzle coating heads 11, 12, 13, 14, 15 can also be moved perpendicular to the track plane (indicated by the double arrow). This allows and / or facilitates intermittent coating during application of the track 110. Preferably, the individual single-nozzle coating heads 11, 12, 13, 14, 15 can also be moved independently of each other in this direction, thereby allowing them to be raised and lowered individually depending on the pattern to be applied. FIG. 8 shows a preferred embodiment of the method according to the invention in the form of a flow diagram. Method features described as individual steps should be understood such that the steps can proceed in parallel within one pass of the method for coating both sides of the metal foil, whereby the metal foil to be coated proceeds 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, e.g. the corresponding coating heads, for carrying out the steps in the coating device.

[0099] After a ribbon-shaped metal foil is provided in step 201, a strip-shaped coating is applied to the first side of the metal foil (step 202) and a strip-shaped coating is applied to the second side of the metal foil (step 203) in a continuous process. Steps 202 and 203 are performed simultaneously by arranging corresponding coating heads on both sides of the metal foil and applying coatings to both sides of the metal foil at a spatial distance from each other as the metal foil passes, if necessary, as the metal foil passes. 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 whether a detectable strip offset, if any, exceeds a predefined threshold. This determination of the strip offset is performed in particular with the aid of one or more sensors. If a strip offset or a strip offset above a predefined threshold is detected (step 205), a position correction of the coating head for coating the second side of the metal foil (step 203) is performed in step 206 while the coating proceeds. In step 204, if no strip offset or a strip offset below a predefined 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 invention in the form of a flow chart. As with the flow diagram according to Figure 8, method features described as individual steps should be understood as the steps proceeding overlapping in time within one pass of the method for coating both sides of the metal foil, so that the metal foil to be coated proceeds continuously through the coating method, in effect as 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 side of the metal foil in a continuous process (step 302). In step 303, the strip boundaries and / or strip positions are determined for the coating already applied to the first side. In step 304, the second side of the metal foil is coated in strips. Steps 302 and 304 are preferably performed simultaneously, since a coating head is applied to both sides of the metal foil and, if necessary, the coating is applied in one pass of the metal foil at a spatial distance from each other. The data determined in step 303 can be incorporated in step 305 into a position correction of the coating head for the strip-shaped coating on the second side of the metal foil in step 304. In step 306, it is checked whether a strip offset occurs during application of the coating on the second side and / or if a strip offset can be detected, whether it exceeds a predefined threshold value. If a strip offset or a strip offset above a predefined threshold can be detected (step 307), this is included in the position correction of the coating head (step 305) for the coating of the second side of the metal foil (step 304). In step 306, if no strip offset or a strip offset below a predefined threshold is detected, coating of the metal foil can continue 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 in particular performed using one or more sensors, for example using a camera or an edge sensor.

Claims

1. 1. A method for manufacturing a ribbon electrode comprising a ribbon current collector coated on both sides with a layer of electrode material, the ribbon current collector having an area on both sides extending along one of its longitudinal edges that is not coated with said electrode material, comprising: a. providing a ribbon-shaped metal foil (100); b. A method step of coating the ribbon-shaped metal foil (100) with electrode material in a continuous process, in which by means of a coating nozzle a number of parallel strips (120) of electrode material are applied to a first side of the ribbon-shaped metal foil (100) and an equal number of parallel strips (110) of electrode material are applied to a second side of the ribbon-shaped metal foil (100), so that in a viewing direction perpendicular to the ribbon-shaped 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-shaped metal foil (100), and non-coated strip-like areas (111, 121) on both sides between directly adjacent parallel strips (110, 120) of electrode material remain free of the electrode material. In a method comprising: c. the parallel strips (110, 120) of electrode material are simultaneously applied to the first and second sides of the ribbon-shaped metal foil (100); d. Preferably, at least one sensor detects whether an offset occurs between the overlapping strips (110, 120) on said first and second sides and / or whether the offset exceeds a predefined threshold; e. correcting at least one position of the application nozzle relative to the ribbon-shaped metal foil (100) when an offset between the overlapping strips (110, 120) on the first and second sides occurs and / or exceeds the predetermined threshold value of the offset; The method comprising:

2. Additional features include: a. the strip of electrode material (110) is applied to at least one of the faces of the ribbon-shaped metal foil (100) by several single-nozzle coating heads (11, 12, 13, 14, 15) each having an application nozzle, the positions of which relative to each other can be varied; b. Each of the single nozzle coating heads (11, 12, 13, 14, 15) is displaceable perpendicular to the passing direction of the ribbon-shaped metal foil (100). The method of claim 1 , characterized by at least one of the following:

3. Additional features include: a. the strip of electrode material (120) is applied to the first side of the ribbon of metal foil by at least one multi-nozzle coating head (16) including multiple application nozzles at a fixed distance from each other; b. the strip (110) of electrode material is applied to the second side of the ribbon-shaped metal foil (100) by the single-nozzle coating heads (11, 12, 13, 14, 15), each having a coating nozzle, the position of which can be changed relative to the other coating nozzles; The method according to claim 3, characterized by:

4. Additional features include: a. detecting at least one distance and / or change in distance of the overlapping strips (110, 120) from a longitudinal edge of the ribbon-shaped metal foil (100) in order to detect a possible offset between the overlapping strips (110, 120) on the first and second sides of the ribbon-shaped metal foil (100); b. detecting at least one distance and / or change in distance of the overlapping strips (110, 120) from adjacent strips in order to detect possible offsets between the overlapping strips (110, 120) on the first and second sides of the ribbon-shaped metal foil (100); c. detecting the centerlines of the overlapping strips (110, 120) and / or changes in said centerlines in order to detect possible offsets between the overlapping strips (110, 120) on the first and second sides of the ribbon-shaped metal foil (100); The method according to any one of claims 1 to 3, characterized by at least one of the following:

5. Additional features include: a. after coating both sides of the ribbon of metal foil, the strip of electrode material is dried; b. The electrode material is dried in an airflow dryer. The method according to any one of claims 1 to 4, characterized by at least one of the following:

6. Additional features include: After both sides of the ribbon-shaped metal foil (100) are coated and / or the electrode material is dried, the ribbon-shaped metal foil (100) coated with the electrode material is cut to form the ribbon-shaped electrodes, specifically cut in the longitudinal direction; b. to cut the ribbon-shaped metal foil (100), the foil is cut in the longitudinal direction, the cut being made through at least one of the non-coated strip-shaped areas (111, 121) located between adjacent strips (110, 120) of electrode material; c. To cut the ribbon-shaped metal foil (100), the foil is cut longitudinally, the cut being made through at least one of the strips (110, 120). The method according to any one of claims 1 to 5, characterized by at least one of the following:

7. 1. A device for manufacturing ribbon electrodes comprising a ribbon-shaped current collector coated on both sides with a layer of electrode material, the ribbon-shaped current collector having on both sides an area extending along one of its longitudinal edges that is not coated with said electrode material, the device having the following characteristics: a. the device includes a conveyor section for conveying a ribbon-shaped metal foil (100) having a first and second surface in a passing direction parallel to a longitudinal direction of the metal foil (100); b. said device comprises several application nozzles serving and positioned accordingly to coat said first side of said ribbon-shaped metal foil (100) and said second side of said ribbon-shaped metal foil (100) with electrode material; c) said application nozzle is positioned such that a plurality of parallel strips (120) of said electrode material can be applied to said first side of said ribbon-shaped metal foil (100) and an equal number of parallel strips (110) of said electrode material can be applied to said second side of said ribbon-shaped metal foil (100), so that in a line of sight perpendicular to said ribbon-shaped metal foil (100), in each case one strip on said first side (120) overlaps one of said strips on said second side (110) of said ribbon-shaped metal foil (100), and on both sides between directly adjacent parallel strips (110, 120) of said electrode material, non-coated strip-like areas (111, 121) remain free of said electrode material; d. the device is configured to coat the first and second sides of the ribbon-shaped metal foil (100) simultaneously with the application nozzle; e. said device being constructed such that it is capable of detecting whether an offset occurs between overlapping strips (110, 120) on said first and second faces and / or whether the offset exceeds a predefined threshold value; The device that contains

8. Additional features include: a. said device comprises several single-nozzle coating heads (11, 12, 13, 14, 15) each having an application nozzle, the position of which can be changed relative to each other, b. The single nozzle coating head (11, 12, 13, 14, 15) is displaceable perpendicular to the passing direction of the ribbon-shaped metal foil (100). The device of claim 7 characterized by at least one of the following:

9. Additional features include: a. the device includes at least one multi-nozzle coating head (16) including multiple application nozzles at a fixed distance from each other, the at least one multi-nozzle coating head (16) being aligned to coat one side of the ribbon-shaped metal foil (100); b. the device includes a plurality of single-nozzle coating heads (11, 12, 13, 14, 15), each having a coating nozzle, the positions of which can be changed relative to each other, the single-nozzle coating heads (11, 12, 13, 14, 15) being aligned to coat the other side of the ribbon-shaped metal foil (100); 9. The device according to claim 7 or 8, characterized by:

10. Additional features include: a. the single nozzle coating heads (11, 12, 13, 14, 15) are arranged offset relative to one another with respect to the passing direction of the ribbon-shaped metal foil (100) to be coated; b. the single nozzle coating heads (11, 12, 13, 14, 15) are arranged in two rows perpendicular to the passing direction of the ribbon-shaped metal foil (100) to be coated; 11. The device according to claim 9 or 10, characterized by at least one of the following:

11. Additional features include: a. the device includes a sensor system for detecting a possible offset between overlapping strips (110, 120) on the first and second sides of the ribbon-shaped metal foil (100); b. the device includes a drying device for the coated ribbon-shaped metal foil (100), preferably a floating dryer; c. the device includes a cutting device, specifically a cutting device for cutting the coated ribbon-shaped metal foil (100) in the longitudinal direction; The device according to any one of claims 7 to 10, characterized by at least one of the following:

12. A ribbon electrode manufactured by the method according to any one of claims 1 to 7.

13. Use of the ribbon electrode according to claim 12 for the manufacture of an electrochemical energy storage element.

14. Electrochemical energy storage element, characterized in that it comprises at least one ribbon electrode manufactured by the method according to any one of claims 1 to 7.

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