DE102020203092A1 - Method for processing an electrode web and processing device therefor - Google Patents

Abstract

A method for processing an electrode sheet (4) is specified, the electrode sheet (4) having a carrier layer (6) and an electrode material (8) which is applied to the carrier layer (6) only in a material region (10) of the electrode sheet (4) ) is applied so that a free area (12) remains, which is free of electrode material (8), for the formation of arresters (14), the electrode web (4) being guided in a conveying direction (F) through a processing device (2), so that the material area (10) and the free area (12) run side by side, the processing device (2) having a calender (20) through which the electrode web (4) is guided and with which the material area (10) is calendered, the Processing device (2) additionally has at least one roller (22a-i) which is designed in such a way that it exerts a transverse tensile stress (F4) on the electrode web (4). A corresponding processing device (2) is also specified.

Description

The invention relates to a method for processing an electrode web and a processing device suitable for this purpose.

An electrode sheet is used to make a battery, d . H . for the production of an electro-chemical energy storage device. The battery is, for example, a Li-ion battery, which is used as an electrical energy store in an electric or hybrid vehicle to supply an electric drive train of the same vehicle.

The electrode track serves as a starting point for the production of electrodes for the battery. The electrode track is designed accordingly for the production of anodes or cathodes and, depending on the type of electrode, consists of appropriate materials. In general, an electrode track has a carrier layer, for example made of copper in the case of an anode and of aluminum in the case of a cathode. An electrode material is applied to one or both sides of the carrier layer, for example a mixture with lithium as active material in the case of a cathode and a mixture with graphite as active material in the case of an anode. Typically, other materials such as binders, solvents, carbon black or other additives are added to the respective mixture.

The combination of carrier layer and electrode material results in an electrode sheet from which several electrodes are subsequently produced. A single electrode web is provided rolled up as a roll, for example, unwound via an unwinder and fed to a processing device for further processing.

The de WO 2019/174844 A1 describes a method for producing an electrode foil. An electrode foil is calendered by means of two calenders and then part of a conductor foil of the electrode foil is cut off by means of laser radiation.

the DE 10 2017 218 137 A1 describes a method for manufacturing an electrode assembly. the DE 10 2012 005 229 A1 describes a method for manufacturing a battery cell.

Against this background, it is an object of the invention to improve the processing of an electrode track. For this purpose, a corresponding method and a corresponding processing device should be specified.

The object is achieved according to the invention by a method with the features according to claim 1 and by a processing device with the features according to claim 10. Advantageous configurations, developments and variants are the subject matter of the subclaims. The statements in connection with the method also apply mutatis mutandis to the processing device and vice versa. If method steps of the method are described below, advantageous configurations for the machining device result, in particular, from the fact that it is designed to carry out one or more of these method steps. If individual parts, especially rollers, are described below, these are preferably parts of the processing device.

The method is used to process an electrode track, in particular an electrode track for a battery. The electrode track is also referred to as an electrode foil. The electrode track has a carrier layer and an electrode material which is applied to the carrier layer only in a material area of the electrode track, so that a free area remains which is free of electrode material for the formation of arresters. The electrode sheet serves as a semi-finished product and as a starting point for the production of individual electrodes, e.g. for a prismatic cell, a round cell or a pouch cell. In this respect, the method is used in particular in the manufacture of electrodes. In the finished electrode, the arresters serve to make contact with them, e.g. with a line or with other electrodes. The material area is also referred to as the active area, since it has the electrochemically active electrode material. The free area is also referred to as the arrester area, since it is used to form the arresters for contacting and for conducting current from or to the electrode. The electrode web is also generally referred to as continuous goods, since the electrode web is typically significantly longer than it is wide and can be rolled up and down. A rolled up electrode web forms a roll which can be fed to a roll-to-roll process in a simple manner.

As part of the method, the electrode web is guided in a conveying direction through a processing device, so that the material area and the free area run next to one another. The processing device is also referred to as a processing machine or a processing system. In a suitable embodiment, the processing device is a roll-to-toll device and the method, in particular, is a roll-to-roll method. The electrode web is preferably unrolled from an unwinder of the processing device or, alternatively, already passed on to the processing device as an unrolled web, for example from a device connected upstream along a production line. The conveying direction corresponds to one Longitudinal direction of the electrode track. Cross, d . H . In particular, a transverse direction runs perpendicular to the longitudinal direction. The electrode track lies in a plane which is spanned by the longitudinal direction and the transverse direction. When passing through the processing device during the process, the electrode foil is possibly deflected once or several times, so that the plane and the conveying direction are also deflected accordingly. The material area and the free area are formed next to one another in the longitudinal direction and accordingly run next to one another in the conveying direction. In particular, the free area and the material area are directly adjacent to one another, d . H . the free area begins directly where the electrode material ends on the carrier layer and forms an edge. The free area is characterized in particular by the fact that it is thinner than the material area, since the additional electrode material is applied in this area.

Measured in the longitudinal direction, the electrode track is, for example, several 100 m long. The electrode web, measured perpendicular to the longitudinal direction, preferably has a width in the range from 10 cm to 150 cm. The free area, measured perpendicular to the longitudinal direction, preferably has a width which is between 5 mm and 50 mm. The material area takes up the remaining width. An embodiment is particularly preferred in which a single material area runs centrally between two lateral free areas, the free areas preferably also forming edge areas of the electrode track. Alternatively, several material areas are alternately arranged perpendicular to the longitudinal direction with several free areas. In the following, without restricting the generality, an electrode web with a material area is assumed which is bordered on both sides by two free areas. The explanations also apply analogously to other geometries.

The carrier layer preferably consists of a metal, particularly preferably aluminum or copper. The carrier layer preferably has a thickness in the range from 5 μm to 20 μm. In the free area, the thickness of the electrode track corresponds in particular to the thickness of the carrier layer, since no other materials are present here. In a suitable embodiment, the electrode material consists of a mixture with lithium or graphite as the active material. The active material is selected in particular as a function of the material of the carrier layer. One or more other materials are suitably added to the respective mixture, e.g. binders, solvents, carbon black or other additives. Before being fed into the processing device, the electrode material is preferably applied with a thickness in the range from 50 μm to 200 μm. The electrode material is preferably applied to the carrier layer on both sides, so that the electrode web then has a thickness in the range of 105 μm to 420 μm in the material area. Alternatively, the electrode material is only applied to one side of the carrier layer, so that the electrode web then has a thickness in the range of 55 μm to 220 μm in the material area. In the following, without loss of generality, a carrier layer coated on both sides with electrode material is assumed. However, the statements also apply analogously to a carrier layer coated on only one side.

The processing device has a calender, which is a processing stage of the processing device. The electrode web is passed through the calender and the material area is then calendered with this. As a result, a force is exerted perpendicularly both to the longitudinal direction and to the transverse direction, that is to say perpendicular to the plane of the electrode path, by means of which the electrode material is pressed and compressed. The electrode material is preferably compressed by 30% to 50%.

The calender has at least two or more rolls, each of which is also referred to as a calender roll. A calender roll is characterized in that it is pressed against the electrode web during the process in order to compress the electrode material. The electrode web is suitably passed through two calender rolls which are arranged at a distance from one another which is less than the thickness of the electrode web in front of the calender. A respective calender roll, especially its outer surface, which is in contact with the material area, is preferably harder than the electrode material and for this purpose is made of a hard material. A hard material is understood here and generally as a material with a hardness greater than 50 HRC ( d . H . Rockwell hardness), preferably a metal, in particular steel, hardened steel or chrome steel, understood or a carbon fiber reinforced plastic or the like. An embodiment is also advantageous in which the roller is completely or partially coated with a hard material, preferably tungsten carbide. A multi-stage calender is also useful, in which the electrode web is guided one behind the other in the conveying direction through several processing stages, each with in particular two calender rollers, for multi-stage compression.

In the present case, the processing device now additionally has d . H . in addition to the calender, at least one roller which is designed in such a way that it exerts a transverse tensile stress on the electrode web. The electrode track is therefore additionally provided by means of the additional roller processed, namely targeted attacked and pulled across, d . H . pulled in the transverse direction. The roller generates a transverse tensile stress which acts transversely to the conveying direction and is introduced by the roller into the electrode web and especially into the carrier layer. The roller preferably exerts a transverse tensile stress on the electrode web in order to avoid wrinkling, in particular wrinkling of the carrier layer. In other words: during the process, the roller exerts a transverse tensile stress on the electrode web, so that wrinkling is avoided. The formation of wrinkles occurs in particular during the process, potentially as a result of the calender or another processing stage of the processing device.

In particular, the roller does not only serve to convey the electrode web in the conveying direction. To convey the electrode foil through the processing device, it expediently has an unwinder and a winder for the electrode foil, which exert a web tension on the electrode foil in the conveying direction.

The processing device preferably has a plurality of additional rollers for processing the carrier layer, in which case the rollers are not necessarily designed in the same way. The roller is generally in particular cylindrical and extends along an axis of rotation about which the roller is in particular rotationally symmetrical. The roller is arranged either in front of or behind the calender in the conveying direction and is then part of a separate processing stage. Alternatively, the roll is arranged inside the calender, suitably in the conveying direction between two processing stages of a multi-stage calender. Alternatively, the roller is arranged within the calender perpendicular to the conveying direction next to a calender roller in such a way that the roller and the calender roller have a common axis of rotation and then different longitudinal regions of the electrode web are processed differently at the same time. In particular, the additional roll is not a calender roll. The additional roller is preferably used primarily or exclusively to act on the carrier layer and not necessarily to process the electrode material, but depending on the arrangement and functionality of the roller relative to the electrode web, this may also be processed by the roller.

A starting point of the invention is, in particular, the observation that when the electrode web is calendered, there is a risk of wrinkles forming, which has negative effects on the quality of the electrode web. The formation of wrinkles is particularly dependent on the strength of a web tension during processing, which is created in the conveying direction in particular by an unwinder and a winder for the electrode web. As the web tension increases, so does the risk of wrinkling.

Wrinkling can be avoided, for example, by coating the carrier layer with electrode material only in sections in the conveying direction, so that an intermittently coated electrode web results, with free areas that extend transversely to the longitudinal direction, in addition to further, lateral free areas that each form an outer edge. The entire electrode web is also referred to as the mother coil and is, for example, first cut lengthways to remove the outer edges, then calendered in a calender and then again cut lengthways, for example, in order to obtain several parallel partial webs, each of which is also called a daughter coil. The respective longitudinal cutting is also referred to as "slitting" or "slitting" and represents an additional cutting operation which is carried out as a processing stage by means of a slitter. Finally, a respective partial web is then cut transversely and thereby divided into longitudinal sections in order to obtain individual electrodes. Calendering and slitting take place, for example, on two different systems and thus in several processing stages separately from one another in such a way that the electrode web is rolled up and down again between two processing steps, as a result of which disadvantageous internal stresses form in the material. During heating, e.g. in the context of calendering, these tensions are released, which usually leads to wrinkles. In the case of a continuously coated electrode web, the formation of wrinkles can be reduced by heating the electrode web in the calender and, in combination with the web tension, plastically deforming any areas of the electrode web that are at risk of creasing in the longitudinal direction. However, the heating and plastic deformation described also result in corresponding heat development and strain hardening, especially of the carrier layer, which can disadvantageously lead to increased oxidation and potentially worsen the weldability of the carrier layer.

In contrast to an intermittently coated electrode web, a continuously coated electrode web has a material region that is continuously formed in the longitudinal direction and thus electrode material that is continuously applied in the longitudinal direction. While in the case of an intermittently coated electrode track, the arresters are formed in particular between two material regions which follow one another in the longitudinal direction, in the case of a continuously coated one Electrode track formed the arrester laterally on the material area.

The problem of wrinkling during calendering will be explained in more detail below. The starting point is the fact that the electrode web, viewed transversely to the longitudinal direction, has a different thickness, since the electrode material is only applied over a partial width. Two imaginary volume elements of the electrode track in the material area and in the free area are therefore subjected to different forces. In the free area, the web tension initially acts as a tensile stress in the longitudinal direction. A compressive stress of the calender acts perpendicularly on the electrode web, i.e. perpendicular to both the longitudinal and the transverse direction, but only in the material area, since this is thicker. In the free area, therefore, no force acts perpendicular to the electrode path. The tensile stress in the longitudinal direction thus creates a compressive stress in the transverse direction, d . H . a negative stretch, which pulls the lateral free areas towards the center. In the materials area, however, the situation is different. The web tension has the same effect here, but there is also the compressive tension in the calender, d . H . negative elongation, which typically outweighs the web tension, so that an additional positive elongation is generated in the transverse direction, which drives the material area laterally outwards. As a result, the lateral free areas are thus driven towards the material area and, conversely, the material area outwards in the direction of the free areas, so that corresponding folds are formed here, which are particularly visible in the free areas. The areas of the electrode web of different thicknesses accordingly experience different transverse stresses, that is to say forces in the transverse direction and transverse to the longitudinal direction.

Another starting point of the invention is, in particular, the observation that calendering typically takes place more slowly than slitting, usually at a conveyor speed that is halved. For example, slitting takes place at a conveying speed of 100 m / min and calendering at a speed of 50 m / min. This results in a correspondingly reduced utilization of the slitter.

Another starting point of the invention is, in particular, the observation that the electrode web in the slitter, i.e. during longitudinal cutting, is not stretched in the longitudinal direction, so that no transverse stress is generated perpendicular to the conveying direction and the slitter therefore generates a disadvantageous tensile stress on the electrode web and also has a cutting edge an adverse ridge.

The problem of the formation of burrs during slotting will also be explained in more detail below. In principle, it is possible to use a combination of two knives for slitting, namely an upper knife and a lower knife, which are arranged on opposite sides of the electrode web, each rotate and cut the electrode web like scissors in the longitudinal direction. Since the knives always shear past each other, the material of the electrode sheet is first drawn between the two knives when cutting, d . H . in the direction of a cutting edge of one knife, so that creases arise. In addition, tensile stress occurs in the area of the cutting edge, which leads to increased burr formation. There is also the risk that, as the knives wear and tear, the material of the electrode web will initially warp out of their plane up or down into a cutting gap before it is actually cut. The result is an uneven cut edge. As a result of the scraping past, there is also no resistance to this on the opposite side of a respective knife, so that the electrode path accordingly deviates in this direction in an uncontrolled manner and forms a burr. The slitting is therefore very undefined overall and takes place in a very uncontrolled manner.

As already indicated above, the processing of an intermittently coated electrode web differs from the processing of a continuously coated electrode web. Without limiting the generality, a single mother coil is assumed for both cases, which is divided into two daughter coils, but the explanations also apply analogously to a single mother coil which is divided into more than two daughter coils. In the case of an intermittently coated electrode web, the carrier layer protruding in the transverse direction is suitably first separated off with a slitter on the side of the successive material areas, d . H . Uncoated edge areas are cut off in the longitudinal direction. This avoids the formation of creases during the subsequent calendering in the calender. After calendering, the electrode web is then cut lengthways again in a further slitter, this time in the middle, in order to obtain two parallel partial webs as daughter coils. A respective daughter coil is then notched and divided into longitudinal sections in order to form individual electrodes. Corresponding arresters are also produced from the free areas between the material areas. After notching and dividing, the individual electrodes are, for example, stacked. Overall, it is disadvantageous that the electrode web is cut lengthways twice, once before and once after calendering, so that a total of at least three processing stages are necessary, namely first slitting, then calendering, then second slitting.

In the case of a continuously coated electrode web, the free areas for forming the arresters run to the side of the material area, which extends continuously along the longitudinal direction. The electrode web is fed to a calender and heated in the process. For example, the electrode web is preheated to 150 ° C. in front of the calender, for example inductively or by means of an infrared radiator, and the calender rollers have a temperature of 170 ° C. in order to further heat the electrode web accordingly as it passes through. After the calender, the electrode sheet is cooled again, for example to room temperature. As a result of the heating, the material of the electrode web becomes softer and then plastically deformed due to the web tension. Any wrinkles are thereby advantageously pulled smooth and correspondingly reduced. However, the already described oxidation of the carrier layer and the resulting reduced weldability of the arresters as well as a possible melting of a binder that may be present in the electrode material are problematic. The electrode track also becomes more ductile as a result of the heating, loses strength and is then more difficult to cut afterwards. Furthermore, any heating represents a corresponding energy requirement. After calendering, the electrode web is fed to a slitter, which on the one hand shortens the lateral free areas to the width required for the arrester and on the other hand divides the material area in the middle in order to produce two partial webs as daughter coils. The final formation of the arrester then takes place in a subsequent, separate notch.

On the basis of the above considerations, the following disadvantages can be identified when processing an electrode web: long process times, complex handling of the electrode web, a large number of separate processing steps, risk of wrinkling during calendering and slitting, reduced cutting quality when slitting in previously uncompacted electrode material before the calender, burr formation and formation of a fracture area and uncontrolled movement of material with wrinkling during slitting.

In the present case, one or more of the aforementioned disadvantages are now eliminated by the at least one additional roller. Various advantageous configurations of the roller are described below. Combining several or all of these configurations results in further advantageous configurations.

First of all, the electrode web is preferably a continuously coated electrode web, but an intermittently coated electrode web is not used. Furthermore, the electrode track is preferably coated in the same way on both sides, and in this respect is symmetrical with respect to the plane of the electrode track. The electrode web preferably has a material region running centrally in the longitudinal direction, with a left side and a right side. On both sides of the material area there is a free area which runs in the longitudinal direction and which is used to form arresters. This results in two lateral free areas, which are at the same time edge areas of the electrode track. The open areas are also preferably continuous, d . H . consistently trained.

The additional roller rotates around an axis of rotation perpendicular to the conveying direction and is arranged on an upper side or a lower side of the electrode web, so that it is guided over a circumferential surface of the roller. In this case, the roller is suitably rotated about its axis of rotation in such a way that the jacket surface rotates with the conveying direction and, so to speak, takes the electrode path with it. The axes of rotation of all the rollers of the processing device are preferably parallel to one another.

In the present case, the roller is designed in such a way that it exerts a transverse tensile stress on the electrode web and especially in particular on the carrier layer, advantageously in order to avoid wrinkling. The roller is therefore also referred to as a cross pull roller. The transverse tensile stress counteracts in particular one or more of the above-described effects for the formation of wrinkles. The transverse tensile stress is a force which transversely, d . H . acts preferably perpendicular to the longitudinal direction and thus also to the conveying direction. The transverse tensile stress acts laterally outwards and thus presses or pushes the carrier layer, starting from a center of the electrode web, in each case outwards to the side. The electrode web and especially its carrier layer are advantageously stretched or tightened in the transverse direction by means of the roller and, so to speak, pulled smooth. The transverse tensile stress of the additional roller effectively prevents wrinkling during processing in the processing device, since the transverse tensile stress provides an additional parameter to modify the forces that act on the electrode web. The transverse tension can be adjusted as required through the specific design of the transverse tension roller and adapted to the specific application. In particular, the transverse tensile stress, which is required to optimally avoid wrinkles, depends on the thickness of the electrode web in the material area and its compression in the calender, d . H . the compressive tension in the calender, but also dependent on the web tension in the conveying direction.

In an expedient embodiment, the roller is designed in such a way that it is in the open area attacks and in this exerts the transverse tensile stress. For this purpose, the roller has different transverse sections viewed in the transverse direction and along its axis of rotation, namely an outer section which extends over the free area and an inner section which extends over the material area. In the case of a central material area with two lateral free areas, the roller then accordingly has an inner section which is laterally bordered by two outer sections. Alternatively, the roller has only one outer section and does not extend in the transverse direction over the material area, but only over the free area and possibly outwards beyond this. If there are several free areas, the processing device preferably has a corresponding roller for each of the free areas, and these rollers have a common axis of rotation. The respective outer section engages the electrode web in the respective free area and generates a transverse tensile stress here, whereas an inner section which may be present exerts at most a compressive stress on the material area. This embodiment is particularly advantageous in order to compensate for a compressive stress in the calender, either inside the calender and as part of it or outside the calender, in particular in the conveying direction in front of it.

In another expedient embodiment, the roller is designed in such a way that it engages the material area and exerts the transverse tensile stress therein. For this purpose, the roller has two transverse sections, viewed in the transverse direction and along its axis of rotation, namely a left-hand section which, starting from the center of the material area, extends transversely to one side, and a right-hand section, which accordingly extends from the center of the material area in Extends transversely to the other side. The two transverse sections now each exert a transverse tensile stress in mutually opposite directions, so that the material area is stretched, pushed or driven outwards from the center on both sides. This configuration is particularly advantageous in order to avoid the formation of burrs and wrinkles when the electrode web is simultaneously severed in the longitudinal direction and into several partial webs.

The two aforementioned configurations can also be combined in the processing machine, in particular in that it has two additional rollers, one of which acts on the free area as described and the other as described on the material area.

In order to exert the transverse tensile stress, the roller has, in a suitable embodiment, a jacket surface which is made wholly or partially from a rubber, for example from a polyurethane. The rubber is preferably continuous in the direction of rotation around the roller, d . H . trained without interruption. The term “rubber” is used here in particular to represent any material that is compressible and has a high level of friction, in particular friction which is greater than that of the hard materials already described above. The outer surface is expediently only in the respective free area, d . H . in particular made of rubber along the respective outer section of a roller. The outer surface of rubber is produced, for example, in such a way that a corresponding rubber layer is applied to a base body of a roller made of a particularly hard material, for example by gluing a rubber band on or by guiding it around the roller. The rubber layer is particularly dependent on the thickness of the electrode material and is expediently thicker than the electrode material in order to enable a certain compression. In particular, the rubber can be compressed in such a way that it is compressed in the radial direction by 100 μm to 500 μm, for example 300 μm. For example, the rubber layer has a thickness in the range from 2 mm to 10 mm, for example 5 mm.

Alternatively or additionally, the roller is designed in a suitable embodiment such that it exerts a greater compressive stress on the free area than on the material area. For this purpose, the roller expediently has a larger diameter in the free area than in the material area, in particular in that a respective outer section has a larger diameter than the inner section. The difference between the diameter of the roller in the free area and in the material area is preferably greater than the thickness of the electrode material in the material area.

The two aforementioned configurations are advantageously combined in such a way that the roller has a cylindrical base body which is sheathed with rubber, more precisely a rubber layer, along a respective outer section, so that here there is a jacket surface made of rubber, while along the inner section the jacket surface is made of the material of the base body is formed. As a result of the sheathing with rubber, a respective outer section automatically also has a larger diameter than the inner section, the difference between these diameters corresponding to a thickness of the rubber layer.

As an alternative or in addition, the roller has a textured outer surface in a suitable embodiment for exerting the transverse tensile stress. The roller accordingly has a texture around the outside, through which the Electrode sheet, especially its carrier layer, a transverse tensile stress is generated. The texture is also known as a profile or structure. The textured outer surface has elevations or depressions or both, so that the friction of the roller is correspondingly increased at least in the area of the textured outer surface. The texture preferably comprises a multiplicity of webs and / or grooves which run parallel to one another and which each preferably run straight. The texture, d . H . the elevations and / or depressions such as webs and / or grooves are, in particular, set at an angle of incidence relative to the conveying direction so that a corresponding transverse tensile stress results when the roller rotates and engages the electrode web. The angle of attack is preferably set in such a way that the resulting transverse tensile stress generally compensates for the forces due to compressive stress in the calender and web tension in the processing device and thereby optimally prevents wrinkling. The angle of attack is in particular also dependent on the thickness of the electrode material and the compression provided in the calender.

The angle of attack is suitably set in that a suitable roller is selected from a set of rollers with differently textured outer surfaces and is inserted into the processing device. Alternatively, only the rubber layer can be exchanged and, in order to set the angle of attack, only the rubber layer on the base body is exchanged, similar to a tire change. The angle of incidence preferably corresponds to that angle at which the folds run which would be produced if no additional transverse tensile stress were produced by means of the roller. The optimal setting angle and thus the selection of the specific texture are therefore suitably determined by guiding an electrode web without transverse tensile stress through the processing device as part of a calibration and then measuring the angle of the folds that arise relative to the conveying direction. The angle of attack is preferably in the range from 5 ° to 50 °, particularly preferably up to 15 °. In particular, the texture is thus parallel to the folds that would arise.

The texture is preferably a microstructure, d . H . any elevations and depressions such as webs and grooves have only small dimensions. In a suitable embodiment, the webs and / or grooves of the textured outer surface have a height or depth between 50 μm and 1000 μm. In a suitable embodiment, the webs and / or grooves of the textured outer surface have a width between 100 μm and 500 μm. In a suitable embodiment, the webs and / or grooves of the textured outer surface have a length between 3000 μm and 5000 μm. The elevations and / or depressions have a geometry which does not necessarily have to be straight, but is expediently adapted to the geometry of the folds and in particular corresponds to this.

The cross pull roller is preferably a first cross pull roller and is arranged above or below the electrode web and the processing device has a second cross pull roller which is arranged on the opposite side of the electrode web with respect to the first cross pull roller, so that the two cross pull rollers form a gap through which the electrode web is conveyed so that its carrier layer is processed on both sides by means of a cross pull roller. The two transverse tensile rollers form a pair of rollers and are preferably designed in the same way with regard to the generation of a transverse tensile stress, in particular with the same dimensions, the same textures, the same materials or a combination thereof. In this regard, the second transverse draw roller is preferably designed as a mirror image of the first transverse draw roller, the electrode track forming a mirror plane. The two transverse pull rollers in particular have opposite directions of rotation. If the two rollers of the roller pair both have a textured outer surface, the corresponding elevations and / or depressions on both outer surfaces are expediently designed to be complementary to one another, so that an elevation is opposite one depression and vice versa, in particular such that the elevations and depressions intermesh.

In an advantageous embodiment, a separating tool is integrated into the or a further roller, for processing the carrier layer in such a way that it is divided by means of the separating tool. The integration of a cutting by means of the cutting tool in the processing device in addition to the calender is particularly advantageous since two functions are combined in a single processing device. The cutting tool is preferably a knife with a number of blades, “a number of” being understood here and also generally as “one or more”. The roller is then also referred to as a cutting roller. The roller cuts the electrode web and especially the carrier layer by means of the cutting tool, preferably according to the principle of rotary cutting. The cutting tool, especially its blades, is preferably made of tungsten carbide. If the processing only takes place in the open area, only the carrier layer is also divided. If the processing takes place in the material area, in addition to the carrier layer, the electrode material is also broken up due to the principle involved. Correspondingly, a configuration is also conceivable when the transverse tensile stress and the cutting tool are combined suitable in which the cutting tool is integrated into a first roller and the transverse tensile stress is exerted by another, second roller.

By integrating a cutting tool into the processing device and in addition to calendering, a further function is integrated into the processing device. In general, the advantage of this integration is that the electrode track does not have to be rolled up and down repeatedly for different processing stations, but is guided, so to speak, continuously and without interruption through several processing stations. Calendering and dicing are done with a single processing device. The integration of a cutting tool is in itself independent of the exertion of transverse tensile stress, but benefits from it. Therefore, an embodiment in which the processing device has a roller in which a separating tool is integrated, by means of which the electrode web is divided, in particular along the longitudinal direction, even without the feature that the processing device additionally has at least one roller which is designed in this way that this exerts a transverse tensile stress on the electrode web is regarded as inventive. Such a processing device already has the advantage of increased integration, regardless of the avoidance of wrinkling.

In a suitable embodiment, the carrier layer in the free area is divided up by means of the separating tool in such a way that recurring arresters are formed. First longitudinal sections of the free area are repeatedly cut out by means of the cutting tool, so that gaps are created between which second longitudinal sections of the free area are left standing as arresters. As a result, the electrode track is notched, in particular, so that subsequent notching is no longer necessary. This expediently results in a rectangular signal-shaped side edge. The cutting tool accordingly expediently has a number of longitudinal blades which cut in the longitudinal direction and a number of transverse blades which cut in the transverse direction. The longitudinal blades are arranged alternately inside and outside in the direction of rotation of the roller in order to separate or leave longitudinal sections. A transverse blade is arranged in the direction of rotation between two longitudinal blades in order to separate successive longitudinal sections of the free area from one another.

Alternatively or additionally, by means of the cutting tool or a further cutting tool, the electrode web is divided in the material area and along the conveying direction in such a way that several partial webs are formed which run next to one another. The electrode web is preferably divided in the middle. The partial webs are also referred to as daughter coils. For example, at least one left and one right partial web are generated. For this purpose, the cutting tool expediently has a number of blades which are arranged along a common circumferential line around the roller and one behind the other in the direction of rotation, so that a straight cut results in the conveying direction.

The cutting tool for producing the partial webs is either integrated together with the cutting tool for forming the arrester in a single roller, or the two cutting tools are distributed over two different rollers, so that a first cutting tool is integrated into a first roller, by means of which the carrier layer in the free area is divided, that recurring arresters are formed, and a second cutting tool is integrated into a second roller, by means of which the electrode web is divided in the material area and along the conveying direction in such a way that several partial webs are formed which run next to one another.

The cutting tool preferably has an adjustable cutting depth in that the blades can be moved into or out of the roller. In a suitable embodiment, the blades of the cutting tool are resiliently connected to one another for this purpose, namely suitably in such a way that two adjacent blades in the direction of rotation of the roller are connected by means of a spring. In an advantageous embodiment, an adjusting screw, on which an adjusting cone is slidably mounted in the transverse direction, runs along the axis of rotation. The adjusting cone pushes from the inside and in the radial direction, d . H . perpendicular to the axis of rotation, outwards against the blades, which are mounted against a lateral surface of the setting cone. This realizes an adjustment mechanism in which, by turning the adjustment screw, the adjustment cone is displaced in the transverse direction through the roller and, depending on the direction of rotation of the adjustment screw, then drives the blades further out of the roller in the radial direction or lets them retract into the roller through the springs, so that as a result, the cutting depth is adjustable.

An embodiment is particularly advantageous in which the roller is designed at the same time as a transverse tension roller and as a cutting roller, the cutting tool then being integrated into a transverse section of the roller which generates the transverse tension. In this way, an advantageous transverse tensile stress is automatically exerted during the respective cutting by means of the cutting tool, thereby reducing the formation of burrs and wrinkles during the cutting. Particularly in combination with a jacket surface made of rubber, there is an advantageous embodiment in which the Rubber is initially compressed when it comes into contact with the electrode web, thereby releasing the blades of the cutting tool, which then cut the electrode web under optimal transverse tensile stress. The depth of cut and the thickness of the rubber are expediently matched to the thickness of the carrier layer and the electrode material. The lateral surface is correspondingly compressible, so that the cutting tool is automatically released with a suitable cutting depth when the lateral surface is compressed.

Also in the embodiment as a cutting roller, the roller on the opposite side of the electrode web is expediently assigned a counter roller which then forms a roller pair with the roller. The cutting roller is arranged above or below the electrode sheet and the processing device has a counter roller which is arranged on the opposite side of the electrode sheet with respect to the cutting roller, so that the two rollers form a gap through which the electrode sheet is conveyed. In this case, the carrier layer thereof is processed by means of the cutting roller, with a lateral surface of the counter-roller forming a counter-contour for the cutting tool. The cutting tool therefore rolls over the counter roller, so to speak. This results in wedge cutting, which has the advantage over shear cutting with two opposing knives of reduced formation of burrs and wrinkles. The counter roll or at least its outer surface is preferably made of a hard material. In contrast, the jacket surface of the cutting roller is not necessarily made from a similar or the same material, but preferably from a rubber, as already described above.

An embodiment is particularly useful in which the counter roll is a calender roll of the calender, so that the cutting roll is arranged inside the calender and there divides the electrode web. This saves a separate counter roll, and a calender roll is typically already made from a suitable material for use as a counter roll. Since the cutting roller presses heavily on the opposing roller in the area of the cutting tool, there is a potential risk of the opposing roller bending, which is particularly disadvantageous in the calender. Therefore, in an advantageous embodiment, an additional support roller is arranged on a side of the mating roller opposite the cutting roller, so that the cutting roller and the supporting roller press on the mating roller from opposite sides and the one-sided force exerted by the cutting roller is canceled. This is particularly advantageous in the calender. The support roller is suitably made of a hard material.

In a preferred embodiment, the calender is designed in two stages and has three calender rolls, of which one calender roll serves as a counter roll for the other two calender rolls and is therefore advantageously used twice. The counter roll is preferably arranged between the two other calender rolls, so that these are arranged on opposite sides of the calender roll. The electrode web then goes through two processing stages for compaction in the calender, so that the electrode material is compacted twice. If a cutting roll is integrated in the calender, the calender roll, which is a counter roll for the other calender rolls, expediently also forms a counter roll for the cutting roll, so that a particularly compact arrangement results.

In a preferred embodiment, the processing device has a web feed for supplying the electrode web and a web receptacle for receiving the processed electrode web. The web feed preferably has an unwinder which unwinds the electrode web and outputs it in the conveying direction. The web feed expediently also has a counter-roller which is arranged on the opposite side of the electrode web with respect to the unwinder and which presses the electrode web against the unwinder so that the electrode web experiences a normal compressive stress at which the electrode material in particular is not compressed. Analogously, the web take-up preferably has a winder which takes up the electrode web or its partial webs in the conveying direction and winds them up. Appropriately, the web take-up also has a counter-roller, which is arranged on the opposite side of the electrode web with respect to the winder and which presses the respective partial web against the winder, so that here too the electrode web, more precisely the respective partial web, experiences a normal compressive stress which the electrode material in particular is not compacted. The winder and the unwinder generate a web tension in the conveying direction and thus in the longitudinal direction of the electrode web.

Between the web feed and the web take-up, the processing device has several processing stages, of which at least one is formed by the calender and at least one further by the at least one additional roller. The various configurations of the additional roller described above are now implemented by one or more processing stages along the conveying direction. It is fundamentally a large number of combinations of the concepts mentioned are possible. Four advantageous processing stages of the processing device will now be described below, by means of which a process step of the process is carried out in each case. The described combination of the four processing stages with one another and their relative position to one another represent a preferred embodiment, but are not mandatory in this form, so that further advantageous embodiments can be achieved by omitting or adding one or more processing stages as well as through other combinations and / or relative positions of the processing stages to each other.

The processing device preferably has a first processing stage - in particular downstream of the web feed in the conveying direction - with a roller which is designed in such a way that it engages the free area and exerts the transverse tensile stress in it and at the same time forms recurring arresters in the free area. The roller is thus both a transverse pull roller and a cutting roller as already described, in particular with an inner section for the material area and two lateral outer sections for exerting a transverse tension in the lateral free areas. On the opposite side of the electrode web, a further roller is expediently arranged as a counter-roll, which on the one hand is also a cross-pull roll and on the other hand is a counter-roll for the cutting tool of the cutting roll. The processing stage is thus a total of a pair of rollers through which the electrode web is passed.

The first processing step realizes a first process step in which the electrode track is notched, d . H . in which arresters are formed at the side, and this is particularly wrinkle-free. Accordingly, arresters are repeatedly cut from the respective free area under the influence of transverse tensile stress on the one hand and web tension on the other. The cutting tool in the cutting roller is set in such a way that the carrier layer is cut up. The transverse tension rollers generate so much transverse tension that wrinkles are smoothed out or do not appear at all. At the same time, due to the transverse tensile stress, the waste that occurs when dividing in the open area is discharged to the side, e.g. into a chute. The mating roller expediently has a jacket surface made of hard material opposite the cutting tool of the cutting roller. There is no lower knife.

The processing device preferably has a second processing stage, which has two calender rolls of the calender on opposite sides of the electrode film, for compacting the electrode material. The additional roller is designed as a transverse pull roller and is arranged to the side of one of the calender rollers and, together with this, has a common axis of rotation. The calender roller only acts on the material area and the additional roller only acts on the free area. The processing device preferably has not only one additional roller, but another three and thus four rollers taken together in such a way that a respective one of the two calender rollers in the transverse direction on both sides of two of the four rollers, d . H . is bordered by two cross pull rollers and has a common axis of rotation with these. The four rollers only act in a free area and exert a transverse tensile stress there. The respective calender roll is preferably only as wide as the material area, so that the additional rolls only act on the free area. The second processing stage preferably follows the first processing stage, so that the calendering takes place after the notching and the transverse pulling rollers of the second processing stage act on the diverters that have already been formed. The second processing stage is thus also a total of a pair of rollers through which the electrode web is passed.

The second processing step realizes a second process step in which the electrode web is calendered, with the electrode material being compressed in a wrinkle-free manner under the influence of transverse tensile stress on the one hand and web tension on the other hand. A transverse tension is only generated laterally in the free area by the lateral transverse tension rollers, while the electrode material is calendered in the middle by the calender rollers.

The processing device preferably has a third processing stage with the or a further roller, in which - in particular as already described - a separating tool is integrated, for processing the carrier layer in such a way that it is divided by means of the separating tool. At the same time, this roller is designed in such a way that it engages the material area and exerts the transverse tensile stress in it. The roller is accordingly a cross pull roller, which is at the same time a cutting roller, namely, more precisely, a slitter for producing partial webs. On the opposite side of the electrode web, a further roller is expediently arranged as a counter-roll, which on the one hand is also a cross-pull roll and on the other hand a counter-roll for the cutting tool of the cutting roll. One of the calender rolls of the second processing stage is preferably used as the counter roll. As already described, a support roller is then expediently also present opposite the cutting roller. The third The processing stage suitably follows the second processing stage.

The third processing stage realizes a third process step in which the electrode web is slit, d . H . in which several partial webs are formed by a particularly central longitudinal cut, and this is particularly burr-free and wrinkle-free. The electrode web is accordingly divided into several partial webs under the influence of transverse tensile stress on the one hand and web tension on the other hand. In contrast to the calender rolls, the cross pull roller only generates normal compressive stress, so that the electrode material is initially not further compressed when slitting. However, this compressive stress reduces or completely prevents the formation of a burr when dividing. As a result of the transverse tensile stress, the electrode material and the carrier layer are particularly little influenced by the immersion of the cutting tool during cutting and in particular are not drawn into a cutting gap in an uncontrolled manner. Wrinkling and a resulting wave profile are avoided.

The processing device preferably has a fourth processing stage which, like the second processing stage, in turn has two calender rolls of the calender on opposite sides of the electrode film, for re-compacting the electrode material. The second and fourth processing stages thus form the calender as a two-stage calender, for which there are advantageous configurations as already described above. Analogously to the second processing stage in the fourth processing stage, four additional rollers are preferably each designed as a transverse pull roller and arranged to the side of a respective calender roller, so that a respective calender roller is framed on both sides in the transverse direction by two transverse pull rollers and has a common axis of rotation with them. The calender roll is only as wide as the material area, so that the cross pull rolls only act on the free area. The fourth processing stage preferably follows the third processing stage, so that after the cutting, in particular slitting, the electrode material of the partial webs is compacted further. In addition, the cut edges produced during slitting are calendered so that any burrs are compressed and straightened, preferably below a height of 50 µm.

The fourth processing stage realizes a fourth process step in which the partial webs are calendered and any burrs from the third processing stage are squeezed. This, too, takes place under the influence of transverse tensile stress on the one hand and web tension on the other, so that, in turn, compression is crease-free. Analogous to the second processing stage, a transverse tension is only generated laterally in the free area by the lateral transverse tension rollers, while the electrode material is calendered in the middle by the calender rollers.

If rollers with a textured outer surface are used in the second, third and fourth processing stage, these possibly produce a structure or profile of the carrier layer and / or the electrode material. A pattern is thus embossed in the free area and / or in the material area through the textured outer surface. In the open area, this is typically not a problem, since here the arresters are welded when the electrodes are further processed. At least in the material area, the pattern possibly impressed by the third processing stage is expediently compensated for by means of the fourth processing stage, d . H . the electrode track and especially the electrode material is smoothed in the fourth processing stage. For this purpose, the calender roll of the fourth processing stage itself has a smooth outer surface in order to smooth the electrode material in the material area after it has possibly been structured or profiled in the third processing stage by a cross pull roller with a textured outer surface. Irrespective of this, all of the other calender rolls also expediently each have a smooth outer surface. An embodiment is particularly useful in which the roller of the third processing stage, if it has a textured outer surface, has elevations on the outer surface so that depressions are formed in the electrode material, which can then be smoothed particularly easily by the fourth processing stage.

The rollers described in connection with the four processing stages, apart from the calender rollers, are preferably designed independently, so that each processing stage has one or more separate rollers. Only one or more of the calender rolls are expediently used several times in several processing stages. However, configurations are also possible and suitable in which the functions of several rollers of different processing stages are combined in a single roller.

A cleaning step, which is also referred to as web cleaning, is expediently arranged upstream of the winder and after the aforementioned processing steps. The partial webs are cleaned in a fifth process step by means of the cleaning stage. For example, an electrostatic charge is applied to the electrode track and accordingly light particles such as loose electrode material are sucked in and removed. After the winder, the partial webs are expediently separated into electrodes by dividing the partial webs into suitably long longitudinal sections by means of a transverse cutting tool, which then each represent an electrode with an associated arrester.

In summary, the electrode web is preferably processed in all four processing stations with the aid of special transverse tension rollers under the influence of an additional transverse tension, whereby overall wrinkling is efficiently avoided. The cutting tools are advantageously arranged in the respective processing stage only on one side of the electrode foil and cut against a lateral surface of a counter roller, that is, against hard material or against rubber. A lower knife is advantageously dispensed with. A textured outer surface, in particular made of rubber, but alternatively also made of hard material, enables transverse tensile stresses to be introduced particularly effectively. The width of the calender rolls expediently corresponds to the width of the material area, so that in the calender lateral tensile stresses are also advantageously introduced laterally in the free areas by means of lateral cross pull rolls. A heating or tempering of the electrode foil or the calender rolls is not necessary in the present case, so that this is expediently dispensed with and energy is correspondingly saved. Any division is functionally integrated in rolls, preferably in cross-pull rolls, so that a separate process step for division is saved. The calendering is suitably divided into two process steps, thereby achieving an advantageous load distribution and a particularly high density of the electrode material. Calendering downstream of the slitting also advantageously squeezes any burrs, thereby ensuring in particular that the finished electrodes have edge zone damage of less than 10 μm. Horizontal forces when dividing by means of the cutting tools on corresponding counter rollers are advantageously balanced by support rollers. By using one of the calender rolls twice as a middle calender roll between an upper and a lower calender roll, this middle calender roll is optimally balanced.

A preferred embodiment is one in which the cross-pull rolls to the upper calender roll each have a textured outer surface with depressions and in which the cross-pull rolls to the middle calender roll each have a textured outer surface with elevations, which are in particular designed in such a way that they are conveyed into the depressions when the electrode web is conveyed through engage the opposite cross pull rollers. In this way, in particular a protruding profile or structure is formed on the upper side of the electrode track in the free area, which, viewed from the lower side, represents corresponding depressions. The cross pull rolls to the lower calender roll each preferably have a textured outer surface with depressions, which are similarly designed in such a way that they engage in the elevations of the opposite, middle cross pull rolls when the electrode web is conveyed through. In principle, however, a reversed arrangement of elevations and depressions is also conceivable and also suitable.

Slitting, calendering and notching are advantageously integrated in a single processing device. All procedural steps are carried out without wrinkles. In this respect, the method is specifically, in particular, a method for crease-free calendering and burr-free conductor and lengthwise cutting of a continuously coated electrode web. The handling of the electrode web is significantly simplified, which results in improved cycle times in processing and high production speeds of between 80 m / min to 100 m / min, for example.

• 1 eine Bearbeitungsvorrichtung,
• 2a - f jeweils ausschnittsweise eine Elektrodenbahn,
• 3a, b jeweils ausschnittsweise eine andere Elektrodenbahn mit Falten,
• 4a - c jeweils ausschnittsweise eine andere Elektrodenbahn,
• 5a - b jeweils ausschnittsweise eine andere Elektrodenbahn,
• 6a - d Bahnspannung, Druckspannung und negative/positive Dehnung beim Bearbeiten einer Elektrodenbahn,
• 7 ein Schlitzen einer Elektrodenbahn mit Ober- und Untermesser,
• 8 eine erste Bearbeitungsstufe der Bearbeitungsvorrichtung aus 1,
• 9 eine zweite Bearbeitungsstufe der Bearbeitungsvorrichtung aus 1,
• 10 eine dritte Bearbeitungsstufe der Bearbeitungsvorrichtung aus 1,
• 11 eine vierte Bearbeitungsstufe der Bearbeitungsvorrichtung aus 1,
• 12a, b unterschiedliche Ansichten einer Walze mit Trennwerkzeug.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. They each show schematically:

• 1 a processing device,
• 2a - f each section of an electrode track,
• 3a , b each section of a different electrode sheet with folds,
• 4a - c each part of a different electrode track,
• 5a - b each part of a different electrode track,
• 6a - d Web tension, compressive tension and negative / positive elongation when processing an electrode sheet,
• 7th a slitting of an electrode track with an upper and lower knife,
• 8th a first processing stage of the processing device 1 ,
• 9 a second processing stage of the processing device 1 ,
• 10 a third processing stage of the processing device 1 ,
• 11 a fourth processing stage of the processing device 1 ,
• 12a , b different views of a roller with a cutting tool.

In 1 is an exemplary embodiment of a machining device in a sectional view 2 with four processing stages B1 , B2 , B3 , B4 for carrying out a method for processing an electrode track 4th shown. The electrode track 4th has a backing layer 6th on and an electrode material 8th , which is only in one material area 10 the electrode track 4th on the carrier layer 6th is applied so that a free area 12th remains, which is free of electrode material 8th , for the training of arresters 14th . In the 2a - f is the electrode track 4th each shown in detail in a plan view during a method step of the method. The electrode track 4th serves as a semi-finished product and as a starting point for the manufacture of individual electrodes 16 for a battery not explicitly shown.

As part of the process, the electrode track 4th in one conveying direction F. through the processing device 2 guided so that the material area 10 and the free area 12th run side by side. The processing device 2 in 1 is a roll-to-toll device and the process is a roll-to-roll process. The electrode track 4th is handled by an unwinder 18th the processing device 2 unrolled. The direction of conveyance F. corresponds to a longitudinal direction of the electrode track 4th . Cross, d . H . here perpendicular to the longitudinal direction and thus also to the conveying direction F. runs in a transverse direction Q . The electrode track 4th lies in a plane passing through the longitudinal direction and the transverse direction Q is stretched. The material area 10 and the free area 12th run in the conveying direction F. next to each other and are directly adjacent to each other. The free area 12th is characterized by the fact that it is thinner than the material area 10 , because in this yes the additional electrode material 8th is applied. In the 1 and 2a - f runs a single area of material 10 in the middle between two lateral free areas 12th , which are also edge areas of the electrode track 4th form. The explanations apply analogously but also to other geometries.

The carrier layer 6th has a thickness here d1 in the range from 5 µm to 20 µm. The electrode material 8th is here before being fed into the processing device 2 each with a thickness on both sides d2 applied in the range from 50 µm to 200 µm. The electrode track has correspondingly 4th in the material area 10 a thick one d3 in the range from 105 µm to 420 µm. In an alternative not shown, the electrode material is 8th only on one side of the carrier layer 6th applied. The statements made here also apply analogously to a carrier layer coated only on one side 6th .

The processing device 2 has a calender 20th on, through which the electrode track 4th and with which the material area 10 is calendered. This will be perpendicular to both the longitudinal and transverse directions Q , i.e. to the level of the electrode track 4th , a force exerted by which the electrode material 8th is pressed and compressed. In the present case, the electrode material is 8th compressed by a total of 30% to 50% in two successive stages.

In the present case, the processing device now has 2 additionally at least one roller 22a - i on, by means of which the carrier layer 6th is processed, more precisely is the roller 22a - i designed in such a way that it is on the electrode track 4th a transverse tensile stress F4 exercises. General are the reels 22a - i thus for processing the electrode foil 4th educated. In the illustrated embodiment of the 1 the processing device even has nine additional rollers 22a - i which is at different positions along the conveying direction F. and in the various processing stations B1 - B4 sometimes fulfill different functions, as will be explained in more detail below. As is already evident 1 is the respective roller 22a - i either in the conveying direction F. in front of or behind the calender 20th arranged or within the same, e.g. as shown as part of the third processing stage B3 in conveying direction F. between the two processing stages B2 , B4 of the multi-stage calender 20th . More rollers 22a - f , H , i are inside the calender 20th perpendicular to the conveying direction F. next to a respective calender roll 24 arranged so that the roller 22a - f , H , i and the calender roll 24 a common axis of rotation A. have and then different longitudinal areas of the electrode track 4th processed differently at the same time, as in the 9 and 11 is recognizable. The extra rollers 22a - i are not calender rolls 24 , but serve primarily or exclusively to process the carrier layer 6th and not necessarily for processing the electrode material 8th , which, however, depends on the arrangement and functionality of the respective roller 22a - i relative to the electrode track 4th may also be processed.

When calendering the electrode web 4th there is a risk of wrinkles forming 28 what negative effects on the quality of the electrode track 4th Has. The formation of wrinkles 28 depends on the strength of a web tension F1 during processing, which in the conveying direction F. by the unwinder 18th and a rewinder 26th arises. Two examples of an electrode foil 4th with wrinkles 28 are exemplary in 3a and 3b shown.

In the 4a - c shows an example of how wrinkling can be avoided by removing the carrier layer 6th in conveying direction F. only in sections with electrode material 8th is coated so that an intermittently coated Electrode track 4th results, with free areas 12th , which extend transversely to the longitudinal direction, in addition to further, lateral free areas 12th , which each form an outer edge. The entire electrode track 4th will be like in 4a recognizable first cut lengthways in order to remove the outer edges, thereby avoiding wrinkles during the subsequent calendering. After calendering, the procedure is repeated as in 4b shown longitudinally cut in the middle around several parallel partial webs 30th to obtain. The respective longitudinal cutting is also referred to as “slitting” or “slitting” and represents an additional cutting operation that is carried out by means of a slitter, which is not explicitly shown. Finally, a respective partial course 30th then as in 4c shown in cross-section and thereby divided into longitudinal sections to form individual electrodes 16 to obtain. Calendering and slitting take place on two different systems, so that the electrode web 4th is rolled up and down in between, which creates disadvantageous internal stresses in the material. During heating in the course of calendering, these tensions are released, which then usually causes wrinkles 28 develop. It is also disadvantageous that the electrode track 4th is cut lengthways twice, once before and once after calendering, so that a total of at least three processing stages are necessary, namely first slitting, then calendering, then second slitting.

A continuously coated electrode sheet 4th has in contrast to an intermittently coated electrode track 4th a material area formed continuously in the longitudinal direction 10 electrode material applied continuously on and thus in the longitudinal direction 8th . In the 5a , b shows an example of how wrinkling occurs in a continuously coated electrode sheet 4th can be reduced by during the calendering, which was carried out before the in 5a The process step shown takes place, the electrode track 4th is heated and in combination with the web tension F1 in the longitudinal direction any areas of the electrode track that are at risk of creasing 4th be plastically deformed. The heating and plastic deformation also have a corresponding heat development and strain hardening, especially of the carrier layer 6th result, which can disadvantageously lead to increased oxidation and potentially the weldability of the carrier layer 6th worsened. In 5a the electrode sheet is cut lengthways both laterally and in the middle. While with an intermittently coated electrode track 4th the arresters 14th between two material areas following one another in the longitudinal direction 10 are formed in the case of a continuously coated electrode sheet 4th the arresters 14th as in 5b recognizable on the side of the material area 10 educated. For the final training of the arrester 18th a subsequent, separate notch is necessary to cover the intermediate areas remaining after the slitting 32 to remove.

The problem of wrinkling during calendering should be based on the 6a - d will be explained in more detail. The starting point is the fact that the electrode track 4th A different thickness when viewed transversely to the longitudinal direction d3 has, as the electrode material 8th is only applied over a section. 6c shows an imaginary volume element of the electrode track 4th in the material area 10 and 6d shows the imaginary volume element of the electrode track 4th in the open area 12th . The volume elements become different with forces F1 , F2 , F3 applied. In the open area 12th The web tension acts first in the longitudinal direction F1 as tensile stress. Perpendicular to the electrode track 4th , i.e. perpendicular to both the longitudinal and the transverse direction Q a compressive stress acts F2 of the calender 20th , but only in the material area 10 because it is thicker. In the open area 12th thus acts perpendicular to the electrode path 4th no power. The tensile stress in the longitudinal direction thus creates a compressive stress, d . H . negative elongation F3 , in the transverse direction Q , d . H . a negative stretch, which the lateral free areas 12th pulls towards the middle. In the material area 10 the situation is different. The web tension F1 works here in the same way, but there is also a calender 20th the compressive stress F2 , d . H . negative elongation, the web tension F1 typically outweighs, allowing an additional positive stretch F3 in the transverse direction Q which is the material area 12th drives laterally outwards. The result is the lateral free areas 12th to the material area 10 driven towards and vice versa the material area 10 outwards towards the open spaces 12th so that there are corresponding folds here 28 form.

Another problem, namely the formation of burrs when slitting, is discussed below with reference to FIG 7th explained. Basically it is possible to use a combination of two knives for slitting 34 , 36 , namely an upper knife 34 and a bottom knife 36 to use those on opposite sides of the electrode track 4th are arranged, each rotate and the electrode track 4th Cut lengthways like scissors. As the knife 34 , 36 Due to the principle of scraping past each other, the material of the electrode sheet becomes when cutting 4th first between the two knives 34 , 36 drawn, d . H . in the direction of a cutting edge here of the upper knife 34 so that wrinkles appear. In addition, tensile stress occurs in the area of the cutting edge, which leads to increased burr formation. There is also the risk that the knife will wear out as it wears 34 , 36 the material of the electrode track 4th initially as in 7th noticeably warped out of their plane down into a cutting gap before it actually moves is cut up. The result is an uneven cut edge. Because of the scraping by, there is also on the opposite side of each knife 34 , 36 this does not oppose any resistance, so that the electrode track 4th accordingly evades in this direction in an uncontrolled manner and forms a ridge. The slitting is therefore very undefined overall and takes place in a very uncontrolled manner.

The present are now due to the additional rollers 22a - i remedied one or more of the disadvantages mentioned. The design of the rollers explicitly shown here 22a - i represents a preferred, but only one of many suitable exemplary embodiments. The additional rollers 22a - i each rotate around an axis of rotation A. perpendicular to the conveying direction F. and are each either on an upper side or an underside of the electrode track 4th arranged so that this over a lateral surface M. of the respective roller 22a - i to be led. The direction of rotation of a respective roller 22a - i is indicated by a corresponding arrow around the respective axis of rotation A. indicated around.

In the embodiment of 1 has the processing device 2 a rail feed 38 for feeding the electrode sheet 4th on and a web recording 40 for receiving the processed electrode track 4th . The rail feed 38 is the handler here 18th in combination with a counter roller 42 , which is the electrode track 4th to the unwinder 18th presses. The track recording 40 is analogously a combination of the rewinder 26th with a counter roller 44 on which the respective partial line 30th to the rewinder 26th . The rewinder 26th and the handler 18th generate in the conveying direction F. the web tension F1 what in 1 by corresponding arrows around the axes of rotation A. is indicated.

Between the web feed 38 and the track recording 40 has the processing device 2 several processing stages B1 - B4 on, of which two here through the calender 20th with the rollers 22c - f , H , i are formed and the other two are each formed by the rollers 22a , b , g. By means of the four processing stages B1 - B4 one procedural step of the procedure is carried out in each case. The combination of processing stages shown here B1 - B4 with one another and their relative position to one another represent a suitable configuration, but in this form they are not essential, so that further suitable configurations can be made by omitting or adding one or more processing stages B1 - B4 as well as through other combinations and / or relative positions of the processing stages B1 - B4 to each other.

In the 1 shown machining device 2 points in the direction of conveyance F. behind the web feed 38 a first processing stage B1 on, with a roller 22a , which is designed in such a way that it is in the open area 12th attacks and in this a transverse tensile stress F4 exercises and at the same time in the open area 12th recurring arrester 14th trains. The first stage of processing B1 is in 8th in a view along the conveying direction F. shown so that the transverse direction Q lies in the plane of the drawing. The roller 22a is both a cross pull roll and a cutting roll, with an inner section 46 for the material sector 10 and two lateral outer sections 48 , for exerting a transverse tensile stress F4 in the lateral free areas 12th . On the opposite side of the electrode track 4th a further roller 24b is arranged, which on the one hand is also a cross pull roller and on the other hand is a counter roller for a cutting tool 50 the other roller 22a . The first stage of processing B1 is thus a total of a pair of rollers and implements a first process step, which in 2 B is shown and in which the electrode track 4th is notched, d . H . in which side arrester 14th be formed. From the respective open area 12th are under the influence of transverse tensile stress F4 on the one hand and web tension F1 on the other hand, recurring arrester 14th cut. The reels 22a , b generate so much transverse tensile stress F4 that wrinkles are smoothed out or do not appear in the first place. At the same time, the transverse tensile stress F4 the waste that occurs when dividing in the open area 12th accrues, discharged laterally.

The processing device 2 in 1 a second processing stage B2 on which more precisely and in a view along the conveying direction F. in 9 is shown so that the transverse direction Q lies in the plane of the drawing. The second processing stage B2 has two calender rolls 24 of the calender 20th on opposite sides of the electrode foil 4th on, to compact the electrode material 8th . The extra rollers 22c , d , e , f are designed as cross pull rolls and one of the calender rolls on each side 24 arranged. Thus, the processing device 2 in the second processing stage B2 here a total of four additional rollers 22c - f in such a way that a respective one of the two calender rolls 24 in the transverse direction Q on both sides of two of the additional rollers 22c - f , d . H . by two cross pull rollers, and with these a common axis of rotation A. having. The respective calender roll 24 is just as wide as the material range 10 and only acts on this material area 10 so that the additional rollers 22c - f only on the open areas 12th works. The second processing stage B2 follows the first processing stage B1 , so that the calendering takes place after the notching and the cross pulling rolls of the second processing stage B2 on the arresters that have already been trained 14th works. Also the second processing stage B2 is a total of a pair of rollers. Through the second processing stage B2 becomes a second Process step as in 2c shown realized in which the electrode material 8th under the influence of transverse tensile stress F4 on the one hand and web tension F1 on the other hand, is compressed without wrinkles. There is a transverse tensile stress F4 only laterally in the open areas 12th through the side rollers 22c - f generated while centered the electrode material 8th from the calender rolls 24 is calendered.

The processing device 2 in 1 a third processing stage B3 on which more precisely and in a view along the conveying direction F. in 10 is shown so that the transverse direction Q lies in the plane of the drawing. The third processing stage B3 has a roller 22g on which a cutting tool 50 is integrated, for processing the carrier layer 6th such that this by means of the cutting tool 50 is divided. At the same time is the roller 22g designed in such a way that this is on the material area 10 attacks and in this a transverse tensile stress F4 exercises to both sides and outwards. The roller 22g is therefore a cross pull roller and at the same time also a cutting roller, namely a slitter for producing partial webs 30th . On the opposite side of the electrode track 4th is one of the calender rolls 24 arranged as a counter roll. In addition, is opposite the roller 22g a support roller 52 available. The third processing stage B3 follows the second processing stage B2 and implements a third process step as in 2d shown in which the electrode path 4th is slotted, d . H . in which several partial webs through a longitudinal section even in the middle 30th be formed. The electrode track 4th is therefore under the influence of transverse tensile stress F4 on the one hand and web tension F1 on the other hand in several partial tracks 30th divided. The roller 22g produced in contrast to the calender rolls 24 just normal compressive stress F2 so that the electrode material 8th is initially not condensed further.

The processing device 2 in 1 a fourth processing stage B4 on which more precisely and in a view along the conveying direction F. in 11 is shown so that the transverse direction Q lies in the plane of the drawing. The fourth processing stage B4 shows how the second processing stage B2 again two calender rolls 24 of the calender 20th on opposite sides of the electrode track 4th to re-densify the electrode material 8th . The second and fourth processing stage B2 , B4 form the calender 20th thus as a two-stage calender 20th the end. One of the calender rolls is used 24 together with their side rollers 22c , d used twice. Analogous to the second processing stage B2 are in the fourth processing stage B4 the additional rollers 22c , d , H , i each designed as a cross pull roll and to the side of a respective calender roll 24 arranged so that a respective calender roll 24 in the transverse direction Q Is framed on both sides by two cross pull rollers and with these a common axis of rotation A. having. The calender roll 24 is just as wide as the material range 10 so that the cross pull rollers only hit the open area 12th works. The fourth processing stage B4 follows the third processing stage B3 so that after sliding in the third processing stage B3 the electrode material 8th of the partial courses 30th is further compressed. Through the fourth processing stage B4 a fourth process step as in 2e shown realized in which the partial tracks 30th are calendered and any burrs from the third processing stage B3 be squeezed. This also takes place under the influence of transverse tensile stress F4 on the one hand and web tension F1 on the other hand. Analogous to the second processing stage B2 becomes a transverse tensile stress F4 only laterally in the open area 12th through the lateral cross pull rollers 22c , d , H , i generated while centered the electrode material 8th from the calender rolls 24 is calendered.

Before the rewinder 26th and after the aforementioned processing stages B1 - B4 is in 1 an optional cleaning stage B5 arranged, by means of which the partial webs 30th be cleaned in a fifth process step. After the rewinder 26th become the partial courses 30th in the illustrated embodiment to electrodes 16 as in 2f shown isolated by the partial tracks 30th be divided into suitably long longitudinal sections by means of a transverse cutting tool, not explicitly shown, which then each have an electrode 16 represent.

As is clear from the above, a respective roller is 22a - i designed in such a way that this is used for processing the carrier layer 6th on the electrode track 4th and especially on the backing layer 6th a transverse tensile stress F4 exercises to avoid wrinkling. The roller 22a - i is therefore also referred to as a cross pull roller. The transverse tensile stress F4 is a force that transversely, d . H . here perpendicular to the longitudinal direction and thus also to the conveying direction F. works. The transverse tensile stress F4 acts laterally outwards and thus presses the carrier layer 6th starting from a center of the electrode track 4th each outwards to the side. The electrode track 4th and especially their carrier layer 6th are by means of the roller 22a - i accordingly in the transverse direction Q stretched or tightened and smoothed out, so to speak.

The transverse tensile stress F4 can be adjusted as required by the specific design of the cross pull roller and adapted to the specific application. In particular is the transverse tensile stress F4 , which is needed to optimally avoid wrinkles, depending on the thickness d3 the electrode track 4th in the material area 10 and its compression in the calender 20th , d . H . the Compressive stress F2 in the calender 20th , but also dependent on the web tension F1 in conveying direction F. .

The reels 22a - f , H , i are designed, as already described, in such a way that they are located in the open area 12th attack and in this the transverse tensile stress F4 exercise. Against this is the roller 22g in 10 designed differently, namely in such a way that this is at the material area 10 attacks and in this the transverse tensile stress F4 exercises. For this purpose, the roller 22g in the transverse direction Q and along its axis of rotation A. considers two cross sections 54 on, namely a left-hand section, which extends from the center of the material area 10 in the transverse direction Q extends to one side, and a right-hand section, which accordingly extends from the center of the material area 10 in the transverse direction Q extends to the other side. The two cross sections 54 now each practice a transverse tension F4 in opposite directions, so that the material area 10 starting from the middle on both sides is stretched or driven outwards.

For exerting the transverse tension F4 is the respective roller 22a , b designed in such a way that it is in the open area 12th a greater compressive stress F1 exerts than on the material area 10 . For this purpose, the roller 22a , b , i in the open area 12th a larger diameter than in the material area 10 by adding a respective outer section 48 has a larger diameter than the inner portion 46 . The same applies analogously to the combination of the rollers 22c - f , H , i as outer sections 48 with the calender rolls 24 as interior sections 46 .

In addition, in the exemplary embodiment shown, there is a respective roller 22a - i for exerting the transverse tensile stress F4 a lateral surface M. on, which is wholly or partially made of a rubber, such as a polyurethane. In the direction of rotation around the roller 22a - i around the rubber is continuous, d . H . trained without interruption. By the rollers 22a , b is the outer surface M. only along the respective outer section 48 made of rubber. The reels 22a , b each have, for example, a cylindrical base body which runs along a respective outer section 48 is coated with a rubber layer, so that there is a surface here M. made of rubber while along the inner section 46 the outer surface M. is formed from the material of the base body. As a result of the sheathing with rubber, a respective outer section then has 48 also automatically has a larger diameter than the inner section 46 , the difference in these diameters corresponding to a thickness of the rubber layer. This can also be done analogously on the calender rolls 24 apply if they extend across the material area 10 extend out and then into the open area 12th are accordingly provided with a rubber layer, so that here then rollers 22c - f , H , i with a lateral surface M. are made of rubber.

In addition, the rollers point 22a - i for exerting the transverse tensile stress F4 here another textured outer surface M. on, d . H . an outer peripheral texture through which the electrode track 4th , especially their carrier layer 6th , a transverse tensile stress F4 is produced. In the 8th - 11 has textured outer surface M. Elevations or depressions 56 or both on, so that the friction of the roller 22a - i at least in the area of the textured outer surface M. is increased accordingly. The texture includes, for example, a multiplicity of webs and / or grooves which, as in FIGS 8th - 11 can be seen to run parallel to each other and in each case straight. The corresponding elevations and / or depressions 56 on both lateral surfaces M. are designed here to be complementary to one another, so that a recess 56 on the outer surface of the roller arranged here in each case on the upper side 22a , e , f , H , i a survey 56 on the corresponding opposite underside arranged roller 22b, c, d opposite, in particular in such a way that they interlock. The roller 22g is present with surveys 56 formed so that these in the electrode material 8th forms corresponding depressions.

The texture is at an angle of attack W. relative to the conveying direction F. hired so that when the roller rotates 22a - i and their attack on the electrode track 4th a corresponding transverse tensile stress F4 results, as exemplified in 8th is shown. The angle of attack W. is set in the present case in such a way that the resulting transverse tensile stress F4 the forces due to compressive stress F2 in the calender 20th and web tension F1 in the processing device 2 generally balances and thus prevents wrinkles. The angle of attack W. depends on the thickness d2 of the electrode material 8th as well as the one in the calender 20th intended compression.

The angle of attack W. corresponds here to the angle at which the folds 28 run, which would be generated if no additional transverse tensile stress F4 by means of the rollers 22a - i would be generated. The angle of attack W. is set, for example, in that a set of rollers with differently textured outer surfaces M. a suitable roller 22a - i is selected and into the processing device 2 is used. Alternatively, only the rubber layer can be replaced and used to adjust the angle of attack W. the rubber layer on the base body is simply replaced, similar to a tire change.

The texture here is also a microstructure, d . H . the elevations and depressions 56 have only small dimensions A1 , A2 , A3 on. In the 8th - 11 indicate the elevations and / or depressions 56 the textured outer surface M. a height or depth A1 between 50 µm and 1000 µm, a width A2 between 100 µm and 500 µm and a length A3 between 3000 µm and 5000 µm. In the figures there are elevations and / or depressions 56 shown with a geometry which is straight, but this is not mandatory, but in a variant the geometry is adapted to the geometry of the folds 28 and corresponds to this.

In the second, third and fourth processing stage B2 , B3 , B4 become rollers 22c - i with textured outer surface M. used, which may have a structure or profiling of the carrier layer 6th and / or the electrode material 8th produce. Due to the textured outer surface M. So is in the open area 12th and / or in the material area 10 embossed a pattern not explicitly shown. This is present at least in the material area 12th by means of the fourth processing stage B4 balanced, d . H . the electrode track 4th becomes with the fourth processing stage B4 smoothed. To do this, point in the fourth processing stage B4 the calender rolls 24 as in 11 shown not a textured, but a smooth surface M. on to the electrode material 8th in the material area 10 to smooth after this in the third processing stage B3 off the roller 22g with textured outer surface M. possibly structured or profiled. The rest of the calender rolls too 24 in the present case each have a smooth lateral surface M. on.

In the embodiments according to 9 - 11 show the top rollers 22e , f to the upper calender roll 24 each one textured outer surface M. with depressions 56 up and the middle reels 22c , d to the middle calender roll 24 each have a textured outer surface M. with surveys 56 on, which are also designed here in such a way that they are conveyed through the electrode web 4th into the depressions 56 of the opposite rollers e , f intervention. In this way, the electrode sheet is on top 4th in the open area 12th a protruding profile or structure is formed which, viewed from the underside, has corresponding depressions 56 represents. The lower rollers 22h, i to the lower calender roll 24 also have a textured outer surface M. with depressions 56 on, so that these in the surveys 56 the middle reels 22c , d intervention. At the same time, the lower calender roll smooths 24 a possible profiling of the electrode material 8th which was previously done by the surveys 56 the roller 22g was structured, namely with depressions on the top of the electrode track 4th .

The two reels 22a , b as well as the rollers 22c - f , H , i are with regard to the generation of the transverse tensile stress F4 designed identically, specifically with the same dimensions, the same textures and the same materials, although the textures can differ in that on one side of the electrode track 4th Indentations 56 are formed and on the other hand elevations 56 . The roller 22a is in this regard designed as a mirror image of roller 22b, the electrode track 4th forms a mirror plane. So are the rollers 22c , d mirror image of the rollers 22e , f , H , i educated. The reels 22a , b have opposite directions of rotation, as do the rollers 22c , d a direction of rotation opposite to the direction of rotation of the rollers 22e , f , H , i on. The roller 22g has one opposite the reels 22c , d opposite direction of rotation.

The respective cutting tool 50 here is a knife with a number of blades 58 , where “a number of” is understood to mean “one or more”. An example of a roller 22a , g with a parting tool 50 is in 12a in a sectional view perpendicular to the axis of rotation A. shown and in 12b in a sectional view along the axis of rotation A. . The roller If the processing is only in the open area 12th is done with the cutting tool 50 also only the carrier layer 6th divided. Provided that the processing in the material areas 10 takes place, is in addition to the carrier layer 6th in principle also the electrode material 8th divided.

To as in 2 B in the first processing stage B1 by means of the cutting tool 50 the carrier layer 6th in the open area 12th to be divided in such a way that recurring arresters 14th are formed by means of the cutting tool 50 the roller 22a recurring first longitudinal sections of the free area 12th separated out, so that gaps arise, between which second longitudinal sections of the free area 12th as an arrester 14th be left standing. This creates the electrode path 4th notched so that subsequent notching is no longer necessary. This results in a side edge in the form of a rectangular signal. The cutting tool 50 accordingly has a number of longitudinal blades which cut in the longitudinal direction and a number of transverse blades which cut in the transverse direction. The longitudinal blades are in the direction of rotation of the roller 22a arranged alternately inside and outside, in order to separate or leave longitudinal sections. In the direction of rotation between two longitudinal blades, a transverse blade is arranged around successive longitudinal sections of the free area 12th to separate from each other.

To as in 2d shown the carrier layer 6th by means of the cutting tool 50 in the material area 10 in the third processing stage B3 such along the To split lengthways in the middle, that several partial webs 30th are formed, which run side by side, has the cutting tool 50 the roller 22g a number of blades 58 on, which along a common circumferential line around the roller 22g around and in the direction of rotation are arranged one behind the other, so that a straight cut in the conveying direction F. results.

In the present case, this shows in 12a , b shown cutting tool 50 an adjustable depth of cut on by the blades 58 into the roller 22a , g can be retracted or withdrawn from this. In the embodiment shown, the blades are for this purpose 58 of the cutting tool 50 resiliently connected to one another, namely in such a way that two in the direction of rotation of the roller 22a , g adjacent blades 58 by means of a spring 60 are connected. Along the axis of rotation A. an adjusting screw runs 62 on which an adjustment cone 64 in the transverse direction Q is slidingly mounted. The adjusting cone 64 pushes from the inside and in the radial direction, d . H . perpendicular to the axis of rotation A. , outwards against the blades 58 which against a lateral surface of the setting cone 64 are stored. An adjusting mechanism is thus realized in which, by turning the adjusting screw 62 the setting cone 64 in the transverse direction Q through the roller 22a , g is shifted and depending on the direction of rotation of the adjusting screw 62 then the blades 58 in the radial direction further out of the roller 22a , g drives out or this through the springs 60 into the roller 22a , g retracts so that the result is that the cutting depth can be adjusted.

The rollers shown here 22a , g are each designed at the same time as a cross pull roller and as a cutting roller, in which case the cutting tool 50 in a transverse portion of the roller 22a , b is integrated, which is the transverse tensile stress F4 generated. In this way, when dividing up by means of the cutting tool 50 automatically a transverse tensile stress F4 exercised and thereby reduces the formation of burrs and wrinkles when dividing. In combination with the outer surface M. a configuration results from rubber in which the rubber upon contact with the electrode track 4th is first compressed and then the blades 58 of the cutting tool 50 releases which then the electrode path 4th under optimal transverse tensile stress F4 split up. This release of the knife when the lateral surface is compressed is not explicitly shown in the merely schematic figures. The depth of cut and the thickness of the rubber are based on the thickness d1 , d2 the carrier layer 6th and the electrode material 8th customized. The roller 22b forms a counter roller for the roller 22a and one of the calender rolls 24 accordingly forms a counter roll for the roll 22g so that the respective cutting tool 50 rolls over the respective counter roll, whereby a wedge cutting is realized.

List of reference symbols

2

Machining device

4th

Electrode track

6th

Carrier layer

8th

Electrode material

10

Material area

12th

Free area

14th

Arrester

16

electrode

18th

Unwinders

20th

calender

22a - i

roller

24

Calender roll

26th

Rewinder

28

wrinkle

30th

Partial track

32

Intermediate area

34

Knife, upper knife

36

Knife, lower knife

38

Web feed

40

Track recording

42

Counter roll (of the web feed)

44

Counter roll (of web take-up)

46

Interior section

48

Outer section

50

Cutting tool

52

Support roller

54

Transverse section

56

Elevation or deepening

58

blade

60

feather

62

Adjusting screw

64

Adjustment cone

A.

Axis of rotation

A1

Height or depth (of the elevation or depression)

A2

Width (of elevation or depression)

A3

Length (of elevation or depression)

B1

first processing stage

B2

second processing stage

B3

third processing stage

B4

fourth processing stage

B5

Cleaning level

d1

Thickness

d2

Thickness (of electrode material)

d3

Thickness (of the electrode track)

F.

Conveying direction

F1

Web tension

F2

Compressive stress

F3

negative / positive elongation in the transverse direction

F4

Transverse tensile stress

M.

Outer surface

Q

Transverse direction

W.

Angle of attack

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2019/174844 A1 [0005]
• DE 102017218137 A1 [0006]
• DE 102012005229 A1 [0006]

Claims (10)

Method for processing an electrode sheet (4), - wherein the electrode sheet (4) has a carrier layer (6) and an electrode material (8) which is applied to the carrier layer (6) only in a material area (10) of the electrode sheet (4) so that a free area (12) remains, which is free of electrode material (8), for the formation of arresters (14), - wherein the electrode web (4) is guided in a conveying direction (F) through a processing device (2) so that the material area (10) and the free area (12) run next to one another, - wherein the processing device (2) has a calender (20) through which the electrode web (4) is guided and with which the material area (10) is calendered, - The processing device (2) additionally having at least one roller (22a-i) which is designed in such a way that it exerts a transverse tensile stress (F4) on the electrode web (4). Procedure according to Claim 1 , wherein the roller (22a-i) for exerting the transverse tensile stress (F4) has a jacket surface (M) which is wholly or partially made of a rubber. Method according to one of the Claims 1 or 2 , wherein the roller (22a-i) for exerting the transverse tensile stress (F4) has a textured outer surface (M). Method according to one of the Claims 1 until 3 wherein a separating tool (50) is integrated into the or another roller (22a), by means of which the carrier layer (6) is divided in the free area (12) in such a way that recurring arresters (14) are formed. Method according to one of the Claims 1 until 4th wherein a cutting tool (50) is integrated into the or another roller (22g), by means of which the electrode web (4) is cut up in the material area (10) and along the conveying direction (F) in such a way that several partial webs (30) are formed which run side by side. Method according to one of the Claims 1 until 5 , wherein the processing device (2) has a first processing stage (B1) with the roller (22a), which is designed in such a way that it engages the free area (12) and exerts the transverse tensile stress (F4) in this and at the same time in the free area (12 ) recurrent arrester (14) trains. Method according to one of the Claims 1 until 6th , wherein the processing device (2) has a second processing stage (B2), which has two calender rollers (24) of the calender (20) on opposite sides of the electrode web (4), for compacting the electrode material (8), the processing device (2) has four rolls (22c, d, e, f) in such a way that a respective one of the two calender rolls (24) is bordered on both sides in the transverse direction (Q) by two of the four rolls (22c - f) and with these a common axis of rotation (A) the four rollers (22c-f) each acting only in a free area (12) and exerting a transverse tensile stress (F4) there. Method according to one of the Claims 1 until 7th , wherein the processing device (2) has a third processing stage (B3), with the or a further roller (22g), - in which a cutting tool (50) is integrated, for processing the electrode web (4) in such a way that it can be removed by means of the cutting tool (50) is divided, and - which is designed at the same time in such a way that it engages the material region (10) and exerts a transverse tensile stress (F4) in this. Procedure according to Claim 8 , wherein the processing device (2) has a fourth processing stage (B4), - which follows the third processing stage (B3), and - which has two calender rolls (24) of the calender (20) on opposite sides of the electrode web (4), for Compaction of the electrode material (8). Processing device (2) which is designed to carry out a method according to one of the Claims 1 until 9 .

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