Cutting device and method for manufacturing electrode sheets from electrode films

Abstract

The invention relates to a cutting device (1) for manufacturing electrode sheets (2) from electrode films (3), comprising at least a first roller (4) having a first axis of rotation (5) and at least one second roller (6) arranged opposite the first roller (4) having a second axis of rotation (7) which is parallel to the first axis of rotation (5); wherein the first roller (4) has a first support surface (8) which is continuous and columnar for contacting an electrode film (3) which can be guided through a first gap (9) between the rollers (4, 6); wherein the at least one second roller (6) has a cutting profile (10) by which at least one cutting line (11) can be introduced into an electrode film (3) which is guided through the first gap (9) when the rollers (4, 6) are rotating; wherein the second roller (6) has a second support surface (12) which surrounds the cutting profile (10) for contacting an electrode film (3) which can be guided through the first gap (9). The invention also relates to a method for manufacturing electrode sheets (2) from electrode films (3).

Description

Technical Field

[0001] This invention relates to a cutting apparatus and method for manufacturing electrode sheets from electrode films. The electrode sheets are used, particularly in battery cells, and preferably in secondary battery cells. Background Technology

[0002] Batteries, especially lithium-ion batteries, are increasingly being used to power motor vehicles. Batteries typically consist of individual cells, each containing a stack of electrode plates—an anode, a cathode, and a separator. At least a portion of the anode and cathode plates are configured as current conductors to divert current supplied by the cell to power devices located outside the cell.

[0003] In the manufacture of lithium-ion battery cells, the so-called carrier material, especially a strip-shaped carrier material, such as a carrier film, is preferably coated with at least one active material on both sides. The carrier film forms the current conductor of the battery cell. The coated carrier material forms an electrode film. The electrode film is here a continuous material, which can be divided into electrode sheets by a cutting process. These electrode sheets can be used in the battery cell.

[0004] The cutting of lithium-ion battery electrodes typically employs a shearing principle, where an upper cutting tool contacts a lower cutting tool. This results in high friction and consequently, faster tool wear. High-speed kerf cutting (also known as a "cutting line"; the cutting line extends parallel to the transport direction; creating multiple electrode films with decreasing widths from the electrode film) exacerbates this problem. Therefore, kerf speeds are currently limited to a maximum of 120 meters per minute. For example, the kerf process is carried out using upper and lower circular cutting tools made of tungsten carbide. These tools must be re-grinded after approximately 200 kilometers of cutting line length. This re-grinding of the tools typically results in high operating costs.

[0005] Grooving (also known as "slotting," which involves the fabrication of the flag-shaped part of the electrode film, which protrudes laterally from the coated portion of the electrode film as an uncoated component) and electrode separation (also known as "separation," which involves the fabrication of electrode sheets from the electrode film) are performed as separate processes after slotting. These processes are performed either mechanically or by laser. Because separate machines are required for slotting and cutting or separation, significant investment and floor space are necessary.

[0006] Laser grooving is an energy-intensive process (requiring approximately 6 kilowatts of equipment power) and creates a heat-affected zone. Laser processing is inefficient because most of the concentrated beam is reflected by the copper surface of the electrode film. A special green laser is needed to achieve better light absorption by the copper. This type of laser is expensive and does not allow speeds exceeding 80 meters per minute.

[0007] Mechanical grooving results in high tool wear. Furthermore, the feed of the electrode film coil must be stopped at regular intervals to allow for process steps. This leads to reduced grooving speeds.

[0008] During the slitting process, the movement of the electrode film in the z-direction (the thickness direction of the electrode film, transverse to the transport direction) causes wavy areas at the slitting edge. Since there is no matching tool, this wavy pattern cannot be controlled.

[0009] The electrode film moves unrestricted in the y-direction (width direction, transverse to the transport and thickness directions). This results in ripples in the y-direction.

[0010] Burrs form due to the lack of reaction force during kerfing and mechanical grooving.

[0011] Both kerfing and grooving are the largest sources of particles in electrode manufacturing processes. Both processes require the installation of web cleaning equipment, edge cleaning equipment, and tool cleaning equipment, which doubles the cost.

[0012] An apparatus for cutting an electrode film is known from EP2648264B1. The apparatus includes a cutter that cuts the electrode film due to a movement transverse to the surface of the electrode film.

[0013] A cutting device for an electrode film is known from JP3619618B2 and KR101211804B1, respectively. In this device, a continuous material of the electrode film is guided through two rollers with circular cutting sections. The circular cutting sections work together to execute a cutting line, thereby dividing the electrode film into narrower bands.

[0014] A cutting device for an electrode film is known from KR2006-0080092A. The electrode film is guided through a pair of rollers, wherein one roller is cylindrical and serves as a support surface for the electrode film. The other roller has a cutting profile and a spacing retainer. The spacing retainer fixes the distance between the rollers relative to each other. The cutting profile creates a cutting line at the electrode film that extends longitudinally or transversely to the conveying direction. The cutting profile does not contact the support surface of the opposing roller. Summary of the Invention

[0015] The objective of this invention is to at least partially address the problems described in the prior art. In particular, it aims to provide a cutting apparatus and method for manufacturing electrode sheets from electrode films, by which high efficiency of the manufacturing process is achieved while maintaining low cost and high product quality.

[0016] A cutting device having the features of claim 1 and a method having the features of claim 10 help to solve the task. The subject matter of the dependent claims is an advantageous improvement. Features individually listed in the claims can be combined with each other in a technically meaningful way and can be supplemented by explanatory facts in the specification and / or details in the figures, wherein other embodiments of the invention are shown.

[0017] A cutting apparatus for manufacturing electrode sheets from electrode films is proposed. The cutting apparatus includes at least a first roller having a first axis of rotation and at least one second roller having a second axis of rotation parallel to the first axis of rotation, disposed opposite to the first roller. The first roller has a first, continuous columnar support surface for contacting the electrode film that can be guided through a first gap between the rollers. The at least one second roller has a cutting profile through which at least one cutting line can be introduced into the electrode film that is guided through the first gap as the roller rotates. The second roller has a second support surface surrounding the cutting profile for contacting the electrode film that can be guided through the first gap, wherein the second support surface is elastically deformable at least with respect to a radial direction extending transversely to the second axis of rotation.

[0018] The cutting apparatus is particularly used for processing coated electrode films. The coating includes at least one active material for storing ions, especially lithium ions.

[0019] The coating on the electrode film can be applied on one side or both sides. In particular, the coating has a thickness of at least 5 μm, especially between 5 μm and 40 μm, preferably between 8 μm and 25 μm, and particularly preferably at most 40 μm or even at most 25 μm.

[0020] The electrode film is supplied to the cutting device as a continuous material. The electrode film is guided through the cutting device along the conveying direction. The conveying direction extends transversely to the axis of rotation of the rollers and extends through a first gap between the rollers.

[0021] Multiple electrode sheets are manufactured from continuous material using a cutting device. The electrode sheets manufactured using the cutting device particularly have the following geometry, which is configured and suitable for use in a single battery cell.

[0022] The coating is arranged continuously (preferably on both sides) on the carrier material of the electrode film along the transport direction. Uncoated areas may be provided on the sides of the electrode film, which is implemented as a continuous material (if possible, also continuously along the transport direction). These uncoated areas can form the lead-out flags of the electrode sheet.

[0023] The width of the first gap is specifically implemented such that the width of the first gap is greater than the extension of the electrode film. The height of the first gap is coordinated with the electrode film.

[0024] In particular, the cutting profile is always arranged at a distance from the first support surface. Specifically, the second roller with the cutting profile is arranged relative to the first roller in such a way that the cutting profile does not contact the (inelastically deformable) first support surface of the first roller at any point during operation of the cutting device, i.e., when the roller rotates. However, the cutting profile extends through the first gap and toward the first roller to such an extent that at least the carrier material of the electrode film is completely cut. Specifically, the minimum distance between the cutting profile and the first support surface is at least 5 μm, especially at least 10 μm, preferably at most 40 μm, particularly preferably at most 25 μm or even at most 15 μm.

[0025] The second roller has a second support surface that surrounds the cutting profile. This second support surface is elastically deformable along the radial direction. The undeformed second support surface extends outward along the radial direction to such an extent that deformation of the second support surface is achieved by an electrode film arranged in the first gap. The second support surface is pushed towards the second rotation axis by the electrode film in the region of the first gap.

[0026] Outside the first gap, for example along the circumferential direction around the second axis of rotation, in the region where the electrode film does not contact the second support surface, the second support surface is present, especially in the case of no deformation.

[0027] Due to the deformation of the second support surface, the cutting device extends beyond the second support surface in the radial direction, thereby generating the at least one cutting line in the electrode film.

[0028] In particular, the undeformed second support surface extends in the radial direction at least as much as the cutting profile, or even beyond the cutting profile.

[0029] In particular, the first support surface is elastically deformable at least relative to the radial direction. The first support surface can be made of the same type of elastically deformable material as the second support surface, or of a different type of elastically deformable material. The undeformed first support surface extends outward in the radial direction to such an extent that deformation of the first support surface is achieved by an electrode film arranged in the first gap. The first support surface is pushed outward toward the first axis of rotation by the electrode film in the region of the first gap.

[0030] The elastically deformable support surface specifically enables the electrode film coating to remain undamaged outside the cutting line during the cutting process. The extrusion pressure exerted on the electrode film by the rollers can be adjusted as precisely as possible via the elastically deformable support surface, where tolerances, such as those of the electrode film or the coating thickness, can be easily compensated for. Simultaneously, the conveying force acting on the electrode film in the conveying direction can be uniformly transmitted via at least one driven roller.

[0031] In particular, when the first support surface is elastically deformable, the cutting device can be implemented such that the electrode film is completely cut by the cutting profile. Then, this cutting profile extends through the electrode film and penetrates into the elastically deformable material of the support film. Therefore, in this case, the cutting profile and the first support surface are arranged, in particular, without being spaced apart.

[0032] The cutting depth or projection of the cutting profile from the second support surface can be adjusted by adjusting the pressure between the first and second rollers or by selecting an elastically deformable material (e.g., an elastically deformable support membrane and, if possible, an additional first support surface).

[0033] In particular, the cutting device includes at least a plurality of second rollers, each having a different cutting profile that allows a corresponding other cutting line to be introduced into the electrode film. The second rollers are arranged spaced apart from each other along the transport direction of the electrode film and thus in the circumferential direction, and together with the first rollers form a corresponding first gap.

[0034] Here, the electrode film is guided, in particular, at least partially, around the first roller. Thus, the electrode film contacts the first roller not only in the region of the single first gap, but also at least in the region of the second first gap, and, if possible, also in the first roller over an angular range extending between at least two first gaps, over the first support surface of the first roller.

[0035] In particular, a third roller without a cut profile is arranged at least between the two second rollers, preferably between the respective two second rollers, having a third axis of rotation parallel to the second axis of rotation. The third roller has a third support surface for contacting and guiding the electrode film through the second gap between the third roller and the first roller.

[0036] In particular, at least one third roller is used to press the electrode film against the first roller and generate tensile stress in the section of the electrode film located (directly) in the conveying direction before the second gap or the third roller.

[0037] In particular, multiple pairs of corresponding first and second rollers are arranged sequentially along the conveying direction, wherein a predetermined cutting line is introduced into the electrode film by each pair of rollers.

[0038] In particular, the cutting lines are associated with different groups of cutting lines. The first group of cutting lines may, for example, be associated only with kerfs (also called "cuts"), where the cutting lines extend parallel to the transport direction and are in particular continuous; multiple electrode films with reduced widths are produced from the electrode film.

[0039] The second set of cutting lines may, for example, be associated only with slots (also called "grooving"; i.e., the fabrication of the exit body flags, which protrude laterally from the coated portion of the electrode film as an uncoated component of the electrode film). These cutting lines may extend at least partially transverse to the transport direction and at least partially parallel to the transport direction. The resulting exit body flags are arranged spaced apart from each other along the transport direction at the electrode film (which exists as a continuous material). The (especially uncoated) areas of the electrode film existing between the exit body flags along the transport direction are separated and exited (and especially not used as electrode sheets) due to these cutting lines.

[0040] For example, the cutting lines of the third group may be associated, for instance, solely with electrode separation or separation (also referred to as "separation"; i.e., the fabrication of electrode sheets from the electrode film). These cutting lines extend, in particular (at least partially) transverse to the transport direction or parallel to the axis of rotation, wherein the cutting lines produce individual electrode sheets from the continuous material of the electrode film.

[0041] In particular, the cutting profile produces at least one cutting line extending parallel to the axis of rotation (a first axis of rotation, at least one second axis of rotation, and if possible a third axis of rotation), through which the electrode film can be divided into electrode sheets that are separated from each other.

[0042] In particular, the cutting is always performed along the conveying direction using at least one pair of rollers (consisting of a first roller and a second roller) before another pair of rollers, which has a cutting profile for grooving and / or separation.

[0043] In particular, grooving and / or slitting is always performed using at least one pair of rollers along the conveying direction before another pair of rollers, which has a cutting profile for separation.

[0044] In particular, each pair of rollers or a corresponding second roller is associated with only one set of cutting lines. Specifically, each pair of rollers or a corresponding second roller is associated with exactly two sets of cutting lines. Preferably, only one pair of rollers is provided, through which all sets of cutting lines are generated, and in particular, all the cutting lines required for manufacturing the electrode sheet are also generated.

[0045] The electrode sheets, in particular, have a geometry designed for arrangement within the battery cell.

[0046] In particular, the cutting profile is implemented inseparable from the second roller, that is, it is implemented as a single piece with the second roller.

[0047] In particular, the cutting profile can be implemented separately from the second roller. Therefore, it is possible to change the cutting profile according to wear in a simple way.

[0048] In particular, the cutting profile can be fixed to the second roller at least by magnetic force.

[0049] In particular, the material forming at least one of the support surfaces has a texture such that, when the material undergoes elastic deformation, a force directed away from the corresponding cutting line acts from the material onto the electrode film. For example, the texture can be helical, i.e., extending helically around the rotation axis of the corresponding roller.

[0050] The elastic deformability of the material forming the support surface is particularly important in achieving the following: the electrode film regions separated by the cutting line shift together due to the displacement of the elastically deformable material, thereby supporting the cutting action of the cutting contour. The texture of the material can further enhance this effect.

[0051] Elastically deformable materials particularly include polymers, preferably polyurethane. Such materials can be implemented as coatings on corresponding rollers.

[0052] Otherwise, the rollers are made, in particular, of steel (especially chrome-plated).

[0053] In particular, the cutting profile includes a well-known hard metal material, preferably tungsten carbide.

[0054] The cutting device can be particularly arranged in the calendering apparatus. During calendering, the coated base material is guided through a roll assembly, which can be temperature-controlled and thus heat the coated carrier material. The coating is compacted by rolling. Typically, an increase of at least 20% in coating density is achieved. In particular, the at least one first roll described herein can be implemented as a calendering roll.

[0055] The cutting device is preferably configured for processing the coated and compacted electrode film. In particular, the cutting device is the final step in processing the electrode film, through which individual electrode sheets are provided. However, if possible, the cutting device can also be combined with known cutting devices.

[0056] The combination of multiple cutting lines enables improved precision in cutting dimensions because the electrode film does not require repositioning, for example, between kerfs and slots.

[0057] The transverse tensile stress caused by the elastically deformable material of the support surface can reduce or even prevent ripples in the area near the cutting line.

[0058] By applying compressive stress to the electrode film through the rollers, burrs can be reduced or prevented from forming at the cutting line.

[0059] The cutting device can be easily integrated with lamination processes used to manufacture single-chamber monomers, where the anode or cathode is directly laminated with the separator material. Instead of stacking and aggregating the manufactured electrode sheets in a hopper, each individual electrode sheet can be directly transported to the lamination process to coat the separator material.

[0060] There is no need to transport the electrode film between the slitting, grooving, and electrode separation steps. Intermediate storage and packaging are also eliminated. The cutting device can also be integrated into the calendering process, where the calendering rolls can serve as the first roll.

[0061] Furthermore, a method for manufacturing multiple electrode sheets from an electrode film using a cutting device, particularly the described cutting device, is proposed. The cutting device includes at least a first roller having a first axis of rotation and at least one second roller having a second axis of rotation, arranged opposite the first roller and parallel to the first axis of rotation. The first roller has a first support surface in a continuous columnar shape for contacting an electrode film that can be guided through a first gap between the rollers. The at least one second roller has a cutting profile through which at least one cutting line can be introduced into the electrode film that is guided through the first gap as the roller rotates. The second roller has a second support surface surrounding the cutting profile for contacting the electrode film that can be guided through the first gap. Either the second support surface is elastically deformable at least with respect to a radial direction extending transversely to the second axis of rotation, or the elastically deformable support film is guided through the first gap together with the electrode film. The method includes at least the following steps: a) Provide the cutting device; b) Provide at least the electrode film or additionally provide the support film; c) At least the electrode or additionally the support film is conveyed along the conveying direction by a rotating roller of the cutting device; and the cutting line is introduced into the electrode film by at least one cutting profile, wherein the cutting profile produces at least one cutting line extending parallel to the axis of rotation, by which the electrode film can be divided into electrode sheets separated from each other, thereby producing a plurality of electrode sheets.

[0062] The cutting device includes: - Only one first roller and only one second roller; or - Only one first roller and multiple second rollers; or - Multiple first rollers and multiple second rollers.

[0063] In particular, the support membrane is specifically designed to prevent the cut contour from contacting the (especially the non-elastically deformable) first support surface. Therefore, the support membrane only needs to be placed between the first and second rollers. If possible, the electrode membrane can then be conveyed separately.

[0064] The cutting device therefore corresponds to the described cutting device, wherein the elastically deformable second support surface does not necessarily have to be implemented in the proposed method or in the cutting device used herein. Its function can be satisfied by the elastically deformable support membrane.

[0065] In particular, a support film is disposed between the electrode film and the first roller, such that at least one cut profile can extend through the electrode film and into the support film.

[0066] In particular, in the case of an elastically deformable support membrane, the cutting device can be implemented such that the electrode membrane is completely cut by the cutting profile. Here, the cutting profile then extends through the electrode membrane and penetrates into the elastically deformable material of the support membrane. The cutting profile is always arranged at a distance from the first support surface.

[0067] By adjusting the pressure between the first and second rollers or by selecting an elastically deformable material for the support film, the cutting profile emerging from the electrode film and the cutting depth or projection into the support film can be adjusted.

[0068] A battery cell is also proposed, the battery cell comprising at least a housing and at least one electrode plate disposed in the housing, the electrode plate being manufactured by the described method.

[0069] In particular, the battery cell includes a casing surrounding the volume and at least one first electrode sheet of a first electrode type, a second electrode sheet of a second electrode type disposed in the volume, a separator material disposed between the first electrode sheet and the second electrode sheet, and an electrolyte.

[0070] Battery cells, particularly pouch cells (with a deformable housing composed of a pouch film) or prismatic cells (with a dimensionally stable housing), are used as housings for so-called pouch cells. A composite material, such as a composite comprising plastics and aluminum, is also involved.

[0071] Battery cells, especially lithium-ion battery cells.

[0072] The individual electrode sheets in a plurality of electrode plates are arranged in a stacked manner, and in particular, in a pile. The electrode sheets are associated with different electrode types, and are therefore implemented as anodes or cathodes. Here, anodes and cathodes are arranged alternately and are correspondingly separated from each other by a partition material.

[0073] A battery cell is a current storage device, used, for example, in a motor vehicle to store electrical energy. In particular, a motor vehicle has, for example, an electric motor (traction drive) for driving the vehicle, which can be driven by the electrical energy stored in the battery cell.

[0074] A motor vehicle is also proposed, comprising at least a traction drive and a battery with at least one described battery cell, wherein the traction drive can be powered by the at least one battery cell.

[0075] The method can be executed, in particular, by a controller equipped, configured, or programmed to perform the described method. The controller can at least regulate... - The electrode film and, if possible, additionally support film move relative to the rollers along the conveying direction; or - The rotational speed of at least one driven roller.

[0076] Furthermore, the method can also be implemented by a computer or using a processor of a control unit.

[0077] Therefore, a system for processing data is also proposed, which includes a processor adapted / configured such that it performs a portion of the steps of the method or the proposed method.

[0078] A computer-readable storage medium may be provided, the storage medium including instructions that, when executed by a computer / processor, cause the computer / processor to perform at least a portion of the steps of the method or the proposed method.

[0079] The description of the cutting device is particularly applicable to the method, battery cell, motor vehicle, controller, and computer-implemented method (i.e., computer or processor, system for processing data, computer-readable storage medium), and vice versa.

[0080] In particular, the use of indefinite articles (“an”, “a”) in the claims and the description describing the claims should be understood as themselves and not as numerals. Therefore, the terms or components introduced therein should be understood as existing at least once, but in particular, they may also exist multiple times.

[0081] For the sake of caution, it should be noted that the numerals used herein (“first,” “second,” etc.) are primarily (only) used to distinguish multiple objects, parameters, or processes of the same type; that is, in particular, dependencies and / or order of these objects, parameters, or processes are not mandatory. If dependencies and / or order are required, they will be explicitly stated herein, or will be obvious to those skilled in the art when examining the specifically described design. If a component may exist multiple times (“at least one”), the description of one of these components may equally apply to a portion of multiple such components, but this is not mandatory. Attached Figure Description

[0082] The invention and technical background are explained in more detail below with reference to the accompanying drawings. It should be noted that the invention is not limited to the listed embodiments. In particular, unless explicitly stated otherwise, aspects can be extracted from the facts illustrated in the drawings and combined with other components and understandings of this specification. It should be particularly noted that the drawings and, in particular, the scale shown are merely illustrative. Wherein: Figure 1 A method for manufacturing an electrode sheet from an electrode film is shown; Figure 2 A first embodiment of the cutting device is shown in a side view; Figure 3 A view showing the direction of transport according to Figure 2 The cutting device; Figure 4 Show Figure 3 The truncated segment; Figure 5 A second embodiment of the cutting device is shown in a side view; Figure 6 A third embodiment of the cutting device is shown in a side view; Figure 7 A fourth embodiment of the cutting device is shown in a side view; Figure 8 A fifth embodiment of the cutting device is shown in a side view; Figure 9 A view showing the direction of transport according to Figure 8 Cutting device; and Figure 10 Show Figure 9 The segment. Detailed Implementation

[0083] Figure 1 A method for manufacturing electrode sheet 2 from electrode film 3 is shown.

[0084] In the diagram on the left, the electrode film 3 exists as a coated continuous material. The coating 20 includes at least one active material for storing ions (especially lithium ions). The coating 20 is continuously arranged on the carrier material 25 of the electrode film 3 along the transport direction 14. Uncoated areas are continuously provided along the transport direction 14 on the sides of the electrode film 3, which is implemented as a continuous material. These uncoated areas constitute the lead-out flag-shaped portions 21 of the electrode sheet 2.

[0085] exist Figure 1 The intermediate diagram shows the cutting lines 11 of the first group 22 and the second group 23. The cutting lines 11 of the first group 22 are associated only with slits (also called "cuts"), which extend parallel to the transport direction 14 and are continuous; creating multiple electrode films 3 with reduced widths from the electrode film 3. The cutting lines 11 of the second group 23 are associated only with grooves (also called "slots"; i.e., creating outlet flags 21, which protrude laterally from the coated portion of the electrode film 3 as uncoated components of the electrode film 3). These cutting lines 11 extend partly transversely to the transport direction 14 and partly parallel to the transport direction 14. The outlet flags 21 thus created are arranged spaced apart from each other along the transport direction 14 at the electrode film 3 (which exists as a continuous material). The uncoated areas of the electrode film 3 that exist along the transport direction 14 at the outlet flags 21 are separated and introduced by these cutting lines 11 and are not used as electrode sheets 2.

[0086] exist Figure 1 The diagram on the right shows the cutting lines 11 of the third group 24. The cutting lines 11 of the third group 24 are only related to electrode separation or separation (also called "separation"; i.e., the production of electrode sheets 2 from electrode film 3). These cutting lines 11 extend only transversely to the transport direction 14, whereby the individual electrode sheets 2 are produced from the continuous material of electrode film 3 by the cutting lines 11.

[0087] Figure 2 A first implementation variant of the cutting device 1 is shown in a side view. Figure 3 A view along the conveying direction 14 is shown according to Figure 2 Cutting device 1. Figure 4 Show Figure 3 The segment. Figures 2 to 4 The following descriptions are common to all. References are available for... Figure 1 The content of the explanation.

[0088] The cutting device 1 includes a first roller 4 having a first axis of rotation 5 and a second roller 6 having a second axis of rotation 7 arranged opposite to the first roller 4, the second axis of rotation being parallel to the first axis of rotation 5. The first roller 4 has a continuous columnar first support surface 8 for contacting and guiding an electrode film 3 through a first gap 9 between the rollers 4 and 6. The second roller 6 has a cutting profile 10 through which a cutting line 11 can be introduced into the electrode film 3 guided through the first gap 9 as the rollers 4 and 6 rotate. The cutting profile 10 is always spaced apart from the first support surface 8. The second roller 6 has a second support surface 12 surrounding the cutting profile 10 for contacting the electrode film 3 that can be guided through the first gap 9, wherein the second support surface 12 is elastically deformable at least with respect to a radial direction 13 extending transversely to the second axis of rotation 7.

[0089] Electrode film 3 is supplied as a continuous material to cutting device 1. Electrode film 3 is guided through cutting device 1 along conveying direction 14. Conveying direction 14 extends transversely to the rotation axes 5, 7 of rollers 4, 6 and extends through the first gap 9 between rollers 4, 6. Electrode film 3 is held under tensile stress in conveying direction 14 before cutting device 1 (see...). Figure 2 (The arrow on the left side of the cutting device 1 in the image). The cutting profile 10 includes all the cutting lines 11 of the first group 22, the second group 23 and the third group 24, so that there are individual electrode sheets 2 after the cutting device 1 in the transport direction 14, which are transported away on the transport device 26.

[0090] The second roller 6 and the cutting profile 10 are arranged relative to the first roller 4 such that the cutting profile 10 does not contact the first support surface 8 of the first roller 4 at any point during the operation of the cutting device 1, i.e., when the rollers 4 and 6 are rotating. However, the cutting profile 10 extends through the first gap 9 and toward the first roller 4 to such an extent that at least the carrier material 25 of the electrode film 3 is completely cut.

[0091] The second roller 6 has a second support surface 12 that surrounds the cutting profile 10. This second support surface 12 is elastically deformable along the radial direction 13. The undeformed second support surface 12 extends outward along the radial direction 13 to such an extent that deformation of the second support surface 12 is achieved by the electrode film 3 arranged in the first gap 9. The second support surface 12 is pushed outward toward the second rotation axis 7 by the electrode film 3 in the region of the first gap 9.

[0092] Outside the first gap 9, along the circumferential direction 15 around the second rotation axis 7, in the region where the electrode film 3 does not contact the second support surface 12, the second support surface 12 exists without deformation.

[0093] Due to the deformation of the second support surface 12, the cutting device 1 extends beyond the second support surface 12 in the radial direction 13, and thus a cutting line 11 can be generated in the electrode film 3.

[0094] The undeformed second support surface 12 extends beyond the cutting profile 10 in the radial direction 13.

[0095] Figure 5 A second embodiment of the cutting device 1 is shown in a side view. (Refer to...) Figures 1 to 4 The content of the explanation.

[0096] Unlike the first embodiment, in this embodiment, the first support surface 8 of the first roller 4 is also elastically deformable at least relative to the radial direction 13. The undeformed first support surface 8 extends outward along the radial direction 13 to such an extent that deformation of the first support surface 8 is achieved by the electrode film 3 arranged in the first gap 9. The first support surface 8 is pushed towards the first rotation axis 5 by the electrode film 3 in the region of the first gap 9.

[0097] Figure 6 A third embodiment of the cutting device 1 is shown in a side view. (Refer to...) Figures 1 to 5 The content of the explanation.

[0098] According to the third embodiment of the cutting device 1, there are two pairs of corresponding first rollers 4 and second rollers 6, which are arranged sequentially along the conveying direction 14, wherein a predetermined cutting line 11 is introduced into the electrode film 3 by each pair of rollers.

[0099] A pair of rollers, consisting of a first roller 4 and a second roller 6, is used to make a cut along the conveying direction 14 before another pair of rollers, i.e., the cutting line 11 of the first group 22 is introduced. The other pair of rollers has a cutting profile 10 for grooving and separation, i.e. the cutting lines of the second group 23 and the third group 24 are introduced.

[0100] Figure 7 A fourth embodiment of the cutting device 1 is shown in a side view. (Refer to...) Figure 6 The content of the explanation.

[0101] Here, the cutting device 1 includes two second rollers 6, each having a different cutting profile 10, through which a corresponding additional cutting line 11 can be introduced into the electrode film 3. The second rollers 6 are arranged spaced apart from each other along the conveying direction 14 of the electrode film 3 and thus in the circumferential direction 15, and together with the first roller 4, form a corresponding first gap 9.

[0102] The electrode film 3 is guided at least partially around the first roller 4. Therefore, the electrode film 3 contacts the first roller 4 not only in the region of the single first gap 9, but also at least in the region of the second first gap 9, and furthermore, the electrode film contacts the first roller 4 at an angle range extending between the two first gaps 9 on the first support surface 8 of the first roller 4.

[0103] A third roller 16 without a cut profile is arranged between the two second rollers 6, having a third rotation axis 17 parallel to the rotation axes 5,7. The third roller 16 has a third support surface 18 for contacting and guiding the electrode film 3 through the second gap 19 between the third roller 16 and the first roller 4.

[0104] The third roller 16 is used to press the electrode film 3 against the first roller 4 and generate tensile stress in the section of the electrode film 3 directly in front of the second gap 19 or the third roller 16 along the conveying direction 14.

[0105] Figure 8 The fifth embodiment of the cutting device 1 is shown in a side view. Figure 9 A view along the conveying direction 14 is shown according to Figure 8 Cutting device 1. Figure 10 Show Figure 9 The segment. Figures 8 to 10 The following descriptions are common to all. References are available for... Figures 2 to 4 The content of the explanation.

[0106] Unlike the first embodiment, the cutting device 1 used here does not have a deformable second support surface 12; instead, a deformable support membrane 27 is guided through the first gap 9 together with the electrode membrane 3. In the fifth embodiment or the method described, the function of the deformable second support surface 12 is satisfied by the deformable support membrane 27.

[0107] The support membrane 27 is used to prevent the cut contour 10 from contacting the non-elastically deformable first support surface 8. The support membrane 27 only needs to be placed between the first roller 4 and the second roller 6, so that the electrode membrane 3 can be further conveyed separately thereafter.

[0108] The support film 27 is disposed between the electrode film 3 and the first roller 4, such that at least one cut profile 10 extends through the electrode film 3 and extends into the support film 27.

[0109] Under the elastically deformable support membrane 27, the cutting device 1 is operated such that the electrode membrane 3 is completely cut by the cutting profile 10. Here, the cutting profile 10 then extends through the electrode membrane 3 and penetrates into the elastically deformable material of the support membrane 27. The cutting profile 10 is always arranged spaced apart from the first support surface 8.

[0110] By adjusting the pressure between the first roller 4 and the second roller 6, or by selecting an elastically deformable material for the support film 27, the cutting depth or projection of the cutting profile 10 out of the electrode film 3 and into the support film 27 can be adjusted.

[0111] List of reference numerals in the attached diagram: 1 Cutting device 2 electrode plates 3-electrode film 4 First roller 5 First axis of rotation 6 Second roller 7 Second axis of rotation 8 First support surface 9 First gap 10 Cutting Outlines 11 cutting lines 12 Second support surface 13 Radial direction 14 Conveying directions 15 circumferential direction 16 Third Roller 17 Third axis of rotation 18 Third Support Surface 19 Second Gap 20 cladding layers 21. Export body flag-shaped part Group 1 of 22 Group 23 Group 3, 24 25 Carrier Materials 26 Conveying devices 27 Supporting membrane

Claims

1. A cutting apparatus (1) for manufacturing an electrode sheet (2) from an electrode film (3), said cutting apparatus comprising at least a first roller (4) having a first axis of rotation (5) and at least one second roller (6) having a second axis of rotation (7) disposed opposite to the first roller (4), the second axis of rotation being parallel to the first axis of rotation (5); wherein, The first roller (4) has a continuous columnar first support surface (8) for contacting an electrode film (3) that can be guided through a first gap (9) between the rollers (4,6); wherein the at least one second roller (6) has a cutting profile (10) through which at least one cutting line (11) can be introduced into the electrode film (3) that is guided through the first gap (9) when the rollers (4,6) rotate; wherein the second roller (6) has a second support surface (12) surrounding the cutting profile (10) for contacting the electrode film (3) that can be guided through the first gap (9), wherein the second support surface (12) is elastically deformable at least with respect to a radial direction (13) extending transversely to the second axis of rotation (7), wherein, a) The first roller is implemented as a calendering roller, and when guided through the electrode film (3), at least 20% increase in the density of the electrode film (3) is achieved; or b) The cutting device (1) includes at least a plurality of second rollers (6), each of which has a different cutting profile (10) that allows additional cutting lines (11) to be introduced into the electrode film (3) respectively. The second rollers (6) are arranged spaced apart from each other along the conveying direction (14) of the electrode film (3) and thus in the circumferential direction (15), and together with the first roller (4) form a corresponding first gap (9). At least between two second rollers (6) is arranged a third roller (16) without a cutting profile, the third roller having a third rotation axis (17) parallel to the second rotation axis (7), the third roller (16) having a third support surface (18) for contacting the electrode film (3) that can be guided through the second gap (19) between the third roller (16) and the first roller (4).

2. The cutting device (1) according to claim 1, wherein, The undeformed second support surface (12) extends in the radial direction (13) to at least the same extent as the cut profile (10).

3. The cutting device (1) according to any one of the preceding claims, wherein, The first support surface (8) is elastically deformable at least relative to the radial direction (13).

4. The cutting device (1) according to claim 1 or 2, wherein, The cutting profile (10) generates at least one cutting line (11) extending parallel to the rotation axis (5,7,17), through which the electrode film (3) can be divided into electrode sheets (2) that are separated from each other.

5. The cutting device (1) according to claim 1 or 2, wherein, The cutting profile (10) is configured to be separable from the second roller (6).

6. The cutting device (1) according to claim 5, wherein, The cutting profile (10) can be fixed to the second roller (6) at least by magnetic force.

7. The cutting device (1) according to claim 1 or 2, wherein, The material forming at least one of the support surfaces (8, 12, 18) has a texture such that when the material undergoes elastic deformation, a force away from the direction of the corresponding cutting line (11) is applied by the material to the electrode film (3).

8. A method for manufacturing a plurality of electrode sheets (2) from an electrode film (3) using a cutting device (1), wherein, The cutting device (1) includes at least a first roller (4) having a first axis of rotation (5) and at least one second roller (6) having a second axis of rotation (7) arranged opposite to the first roller (4), the second axis of rotation being parallel to the first axis of rotation (5); wherein the first roller (4) has a continuous columnar first support surface (8) for contacting an electrode film (3) that can be guided through a first gap (9) between the rollers (4,6); wherein the at least one second roller (6) has a cutting profile (10) through which at least one... A cutting line (11) is introduced into an electrode film (3) that is guided through the first gap (9) as the rollers (4, 6) rotate; wherein the second roller (6) has a second support surface (12) surrounding the cutting profile (10), the second support surface being for contacting the electrode film (3) that can be guided through the first gap (9), wherein an elastically deformable support film (27) is guided through the first gap (9) together with the electrode film (3), wherein the support film (27) is disposed between the electrode film (3) and the first roller (4), wherein the method includes at least the following steps: a) Provide the cutting device (1); b) Provide at least the electrode film (3) and additionally provide the support film (27); c) The electrode film (3) and additionally the support film (27) are conveyed along the conveying direction (14) by the rotating rollers (4, 6, 16) of the cutting device (1); and the cutting line (11) is introduced into the electrode film (3) by at least one cutting profile (10), wherein the cutting profile (10) produces at least one cutting line (11) extending parallel to the axis of rotation (5, 7, 17), by which the electrode film (3) can be divided into electrode sheets (2) separated from each other, thereby producing a plurality of electrode sheets (2); wherein the cutting device (1) includes: - Only one first roller (4) and only one second roller (6); or - Only one first roller (4) and multiple second rollers (6); or - Multiple first rollers (4) and multiple second rollers (6).

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