Method and manufacturing apparatus for producing a planar electrode for a battery cell, battery cell, battery with such a battery cell and motor vehicle

Abstract

The invention relates to a method and a manufacturing device (2) for producing a planar battery electrode (1), the battery electrode (1), a battery cell, a battery, and a motor vehicle. A surface (5, 6) of a planar current collector (3) is coated with active material (4) by defining an active material region (7) on the surface (5, 6) of the current collector. In this region, an electrically conductive adhesive layer (9) made of an adhesive (10) is applied directly to the surface (5, 6) of the current collector by means of an adhesive application unit, precisely matching the contour. An active material layer (11) made of active material (4) is applied to the surface (5, 6) of the current collector by means of an active material application unit. This layer completely covers the active material region (7), so that the adhesive layer (9) forms an adhesive bond between the current collector (3) and the active material layer (11) in the active material region (7).A loose active material fraction (12) of the applied active material layer (11), which was applied outside the active material area (7) to the surface of the conductor body (5, 6), is removed from the surface of the conductor body (5, 6) by means of a removal unit (13).

Description

[0001] The present invention relates to a method for producing a flat electrode for a battery cell, the battery electrode itself, and a battery cell comprising the battery electrode. Furthermore, the invention relates to a battery, in particular a traction battery, for a motor vehicle. Furthermore, the invention relates to a motor vehicle comprising the battery.

[0002] Conventional battery electrodes and their conventional production are known, for example, from EP 3 916 845 B1 or DE 10 2010 032 770 A1. Currently, battery electrodes are often manufactured using a dry coating process in which a free-standing electrode film is rolled onto a current collector foil under the application of pressure and heat, without the use of solvents. Typically, the free-standing electrode film is cut to the desired width before being rolled onto the current collector foil in order to obtain the desired battery electrode shape, including a bare contact tab.

[0003] To ensure reliable adhesion of the free-standing electrode film to the current collector foil, an adhesive layer ("primer") is required between the current collector foil and the electrode film. Alternatively or additionally, the current collector foil or its surface can be treated, for example, by etching, lasering, etc., to create a rough surface that supports reliable adhesion. Precisely congruent positioning of the edge of the free-standing electrode film and the adhesive or primer layer during rolling or lamination is technically challenging – especially when coating both sides of the current collector foil. Failure to achieve precise congruent positioning will result in an undesirable, irregular protrusion of the primer.This leads to a reduced energy density of the corresponding battery cell, which has a conventional battery electrode, and to particularly high material costs. Furthermore, such an overhang varies from battery cell to battery cell, resulting in inconsistent quality and / or performance of the battery cells within a battery cell series. Furthermore, the production of stackable battery electrodes, for example for prismatically stacked or stacked battery cells, is particularly complex, since a continuous strip of active material is first laminated onto the current collector foil and then the desired shape of the respective battery electrode must be cut out of the coated current collector foil. This results in a certain amount of waste despite the best possible waste planning, at least if the active material layer is to have a shape other than a rectangle.The offcut generated by cutting comprises the current collector foil and the active material, which are firmly bonded together—using the primer in dry coating or directly bonded in wet coating. To recycle the active material in the offcut, the current collector foil, active material, and, if applicable, the primer of the same offcut would have to be thoroughly separated from each other. However, this is particularly difficult due to the strong adhesion of the active material to the current collector foil required for battery electrodes. Therefore, recycling the active material and the current collector foil material is currently particularly complex and therefore uneconomical.

[0004] The object of the present invention is to provide a solution for coating a conductor body for the battery electrode with an active material layer with particularly precise contours in order to form a battery electrode.

[0005] This problem is solved by the subject matter of the independent patent claims. Further possible embodiments of the invention are disclosed in the subclaims, the description, and the figures. Features, advantages, and possible embodiments presented in the description for one of the subject matter of the independent claims are to be regarded, across categories and embodiments, at least analogously as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the subclaims.

[0006] The invention proposes a method for producing a flat battery electrode for a battery cell, wherein a conductor body surface of a flat conductor body is coated with active material. A production device according to the invention is configured to carry out the method, i.e., to produce the battery electrode based on the method. Furthermore, a battery electrode produced by means of the method or the production device, and a battery cell comprising such a battery electrode are proposed. The invention further includes a battery comprising the battery cell and a motor vehicle comprising such a battery. The battery comprises the battery cell or a plurality of such battery cells and is designed, in particular, as a traction battery for a motor vehicle.Accordingly, the motor vehicle is in particular a purely or hybrid electric motor vehicle.

[0007] Flat battery electrodes produced by the method are used as the respective intermediate product for manufacturing the battery cell, wherein the flat battery electrodes are stacked / stacked to form a prismatic battery cell or rolled into a round battery cell, for example. Accordingly, the arrester body is a (flexible) flat foil or a (dimensionally stable / rigid) flat plate. Flat is understood here to mean that a longitudinal extent and a transverse extent of the arrester body are dominant over a thickness of the arrester body (for example, 10 µm). In other words, the longitudinal and transverse extents of the arrester body are each much larger, in particular by at least one decimal order of magnitude larger, than the thickness of the arrester body. The arrester body can be an elongated body, which means that its longitudinal extent is dominant over its transverse extent.For example, the arrester body is an elongated plate, or it is a strip or foil that is initially wound onto a roll and then unwound from the roll during the process. A first arrester body surface and a second arrester body surface, oriented in a mirror image of the first arrester body surface, are spaced apart from each other by the thickness of the arrester body. The arrester body is also electrically conductive. For example, in a lithium-ion secondary battery cell, copper or aluminum is particularly suitable as the material for the arrester body—depending on the battery electrode's intended use as a negative or positive electrode.For example, a material comprising graphite or related carbon compounds suitable for intercalation of lithium cations can be considered as an active material for a negative electrode, and a material comprising transition metal compounds (in particular lithium, nickel, manganese, and / or cobalt oxides, layered oxides, lithium iron phosphate, etc.) can be considered for a positive electrode. In particular, for producing the battery cell, the active material is present as a further tape or foil, which is initially wound onto a roll and unwound from the roll during the process. It should be understood that the present invention is not limited to the production of battery electrodes or cells for lithium-ion batteries.

[0008] In a first step S1 of the method, an active material region is defined or established on one of the arrester body surfaces. This defines a positional orientation and shape of the active material on the arrester body surface. This essentially determines the geometry of the active material applied to the arrester body surface in the finished battery electrode. The active material region does not extend into an area of ​​the arrester body that is intended to function as a contact tab for the battery electrode. The active material region can be determined, for example, with computer support, such as using CAD. A corresponding digital blueprint can then be input into the manufacturing device, which executes the further process based on the blueprint.

[0009] In a further step S2 of the process, an electrically conductive adhesion promoter layer is applied with precise contours directly onto the surface of the arrester body in the active material area using an adhesion promoter application unit. The adhesion promoter application unit can be, for example, a spray unit (similar to the principle of an inkjet printer or plotter, a painting robot, etc.), a transfer sublimation unit, and / or a transfer roller unit. An adhesion promoter for the adhesion promoter layer comprises, for example, a polymeric binder material (e.g., polyvinylidene fluoride, polyvinyl acetate, polyethylene, etc.) and a carbon-conductive additive (e.g., carbon black, carbon nanotubes, graphite, etc.).

[0010] A step S3 of the method is then carried out, in which an active material layer is applied to the arrester body surface by means of an active material application unit, completely covering the active material region, such that the adhesion promoter layer in the active material region creates an adhesive bond between the arrester body and the active material layer. According to a possible further development, the active material is provided as a film and laminated onto the active material region. In such a case, the active material application unit is a roller over which the active material film is guided, with the active material film running between the roller and the arrester body. In particular, a calender unit is used for this purpose.Furthermore, it is conceivable that the active material is provided as a pourable powder, which is applied to the arrester body surface partially coated with adhesion promoter and then compacted—for example, by means of roller pressing—to form the active material layer, thereby bonding it to the adhesion promoter in the active material layer. Alternatively, the powder can be placed between two counter-rotating rollers, which compact the powder, thereby creating an active material layer on one of the two rollers. The roller carrying the active material layer then functions as the active material transfer roller, by means of which the active material layer is rolled onto the arrester body surface. These rollers can be part of the calender unit.

[0011] The method deliberately dispenses with prior geometric adjustment, in particular cutting, of the active material layer to the geometry of the active material region, as well as with precise edge alignment between the active material and the active material region, i.e., the area of ​​the arrester body surface coated with the adhesion promoter. Instead, the active material is coarsely applied, in particular laminated, to the arrester body surface in such a way that the active material region is completely covered with active material. The geometry of the active material region and the geometry of the active material to be applied can differ significantly; for example, the active material region can have one or more uneven edges, whereas the active material to be applied (e.g., as a foil) is shaped according to a rectangle.In this process, the active material is only roughly positioned in relation to the active material area in a simple, low-effort manner; a particularly precise and thus - particularly in terms of control technology - particularly complex fine positioning of the active material in relation to the active material area is not required.

[0012] In a step S4 of the method, an active material portion of the active material layer applied to the arrester body surface, which was applied to the arrester body surface outside the active material region and is therefore not bonded to the arrester body by means of the adhesion promoter layer, is removed from the arrester body surface using a removal unit. Although a hand tool such as a spatula, a brush, or the like is conceivable as the removal unit, the feature "removal unit" herein refers to a mechanical removal unit, for example, one as explained in more detail below.

[0013] After step S4, the battery electrode is obtained, which is partially coated with active material and free of unwanted adhesion promoter projections. The invention is based on the idea of ​​laminating the active material, in particular a free-standing electrode film, directly onto the primed current collector foil, i.e. onto the arrester body surface, without a prior geometry-determining cutting step. This is because the adhesion of the active material to the arrester body surface is much stronger in the primed areas (coated with adhesion promoter) than in the unprimed areas. In this way, portions of active material lying on unprimed areas can be easily detached and removed. Undesired adhesion promoter projections are particularly efficiently avoided in the battery cell due to the process.Thanks to the process, the geometry of the active material layer can be easily controlled by designing / defining the active material area. This enables particularly high flexibility and versatility during coating; in particular, an interrupted active material layer on a continuous conductor body is conceivable, as described in more detail below. Unlike previously, particularly precise, edge-accurate alignment of the electrode film or active material at the edges of the active material area is no longer necessary, which is technically challenging, especially with double-sided coatings. Nevertheless, the partial active material layer exhibits a particularly advantageous edge appearance.

[0014] According to a possible further development, a second surface of the arrester body, opposite the first surface described so far, is coated with active material. For this purpose, the method in this further development comprises the following steps: S5 A second active material region is defined on the second arrester body surface, which is a mirror image of the first active material region or differs from the first active material region in terms of positional location and / or geometry. S6 By means of the adhesion promoter application unit or another adhesion promoter application unit, a second electrically conductive adhesion promoter layer is applied in the second active material area with precise contours directly onto the second arrester body surface. S7 A second active material layer made of the same or a different active material is applied to the second arrester body surface, which layer completely covers the second active material region, so that the second adhesion promoter layer in the second active material region provides a second adhesive bond between the arrester body and the second active material layer. S8 An active material portion of the second active material layer applied to the second arrester body surface, which was applied to the second arrester body surface outside the second active material region and is therefore not connected to the arrester body by means of the second adhesion promoter layer, is removed from the second arrester body surface by means of the removal unit or another removal unit.

[0015] The coating of the first arrester body surface (i.e., steps S1-S4) and the coating of the second arrester body surface (i.e., steps S5-S8) can begin and / or end simultaneously or sequentially. Unless the present application explicitly distinguishes between the first and second arrester body surfaces, features and method steps described in connection with one of the arrester body surfaces are to be understood as being analogously applicable to the other of the arrester body surfaces. The method in this development provides a particularly simple way of coating the arrester body on both sides with active material, thereby effectively preventing the formation of adhesion promoter protrusions on both the first and second arrester body surfaces.

[0016] Another possible embodiment provides for the active material region to be defined such that, along a primary direction of extension, in particular the longitudinal direction of extension, of the conductor body, it has two or more active material subregions that are spaced apart from one another, in particular by a first cutting distance. This enables two- or multi-column coating, in particular in combination with the coating of the active material body on both sides. Furthermore, the disadvantage that, in a conventional roll-to-roll dry coating process, the efficient production of an electrode strip whose active material layer on a continuous current collector foil is spaced apart or offset from one another by a cutting distance and consequently interrupted (so-called intermittent electrode strip) is only possible with excessive effort is eliminated.If the freestanding electrode film is cut off during conventional lamination, it must be reinserted into the corresponding conventional manufacturing device to continue production. Such a longitudinally intermittent electrode strip is cut through the first cutting pitch or along edges of the first cutting pitch (e.g., using a laser cutting machine, a punching machine, or the like) to produce stackable individual electrodes, for example, for prismatically stacked or stacked battery cells.

[0017] In a further possible embodiment, it is provided that the active material region is determined in such a way that it has two or more active material sub-regions along a secondary direction of extent, in particular the transverse direction of extent, of the conductor body, which runs transversely to the primary direction of extent and are spaced apart from one another, in particular by a second cutting distance. This enables two-row or multi-row coating, in particular in combination with the coating of both sides of the active material body. Such a transversely intermittent electrode strip is cut by the second cutting distance or along edges of the second cutting distance in order to obtain stackable individual electrodes, for example for prismatically stacked or stacked battery cells. This enables the production of battery electrodes for prismatically stacked orstacked battery cells even easier, since a cycle time for a given coating direction along the primary extension direction does not increase with increasing number of rows.

[0018] Since the active material is removed according to the process before cutting a longitudinally and / or transversely intermittent electrode strip, the offcuts generated from the continuous electrode strip only contain material from the arrester body. This makes it much easier to recycle the arrester body material and the removed active material components. For example, the removed active material components can be recycled in an environmentally and economically advantageous way for the production of the active material foil.

[0019] The loose active material components can be removed from the arrester body surface particularly efficiently and gently if - as provided by another possible embodiment - a suction device, a blower and / or a brushing device is used as the removal unit for removing the loose active material component. The suction device creates a negative pressure on a free active material surface facing away from the corresponding arrester body surface, whereby the loose active material components are sucked off the arrester body surface, i.e., lifted and transported away. The blower creates an overpressure on the free active material surface, whereby the loose active material components are blown off the arrester body surface, i.e., lifted and transported away. A nozzle of a compressed air system can act as the blower, for example.The brushing device mechanically removes the loose active material components from the surface of the arrester body, whereby the brushing device can comprise a rotatable disc brush and / or a rotatable roller brush.

[0020] To prevent damage to the arrester body due to the removal of the loose active material portions, a further possible embodiment provides that at a removal point where the loose active material portion is removed from one of the arrester body surfaces by means of the removal unit, the arrester body is supported by a support unit on the correspondingly other of the arrester body surfaces. In particular, the support unit comprises a support table and / or a support roller.

[0021] The method also simplifies the recycling of active material and arrester body material, making it significantly more economical if, as provided in another possible embodiment, active material portions removed from the arrester body surface are collected by an active material collection unit. The loose active material portions are transported, in particular by means of the suction device, the blower, and / or the brushing device, into a container of the active material collection unit, which container may be, for example, a container, a bag, or another receptacle.

[0022] The production device comprises the adhesion promoter application unit, the active material application unit, and the removal unit, as well as a control unit. In particular, the production device comprises the calendering unit. Furthermore, the production device can comprise the second adhesion promoter application unit, the second active material application unit, and the second removal unit. Furthermore, the production device can comprise the support unit and / or the active material collection unit. The control unit is configured to control the units of the production device according to the method.

[0023] Further features of the invention may emerge from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures alone, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0024] The drawing shows: Fig. 1 a schematic view of steps S1-S4 and S5-S8 of a method for producing a flat battery electrode for a battery cell, Fig. 2 a partial and sectioned perspective view of the battery electrode before its completion, showing loose active material components, Fig. 3 a schematic view of a longitudinally and transversely intermittent electrode band, Fig. 4 a schematic view of the removal of loose active material components from a conductor body, Fig. 5 a schematic view of a bilateral removal of loose active material parts from the arrester body and Fig. 6 a schematic view of a longitudinally intermittent electrode strip from which battery electrodes are cut.

[0025] In the figures, identical and functionally identical elements are provided with the same reference symbols.

[0026] The following describes a method by which a flat battery electrode 1 for a battery cell is produced. At the same time, a production device 2 (see Fig. 4) is described, which is designed to carry out the steps of the method, i.e., to produce the flat battery electrode 1. Battery electrodes 1 produced by means of the method or by means of the production device 2 are used as the respective intermediate product for producing the battery cell, wherein battery electrodes 1 are stacked to form a prismatic battery cell or rolled to form a round battery cell. The resulting battery cells are combined to form a battery, which in the present case is a traction battery for a purely electric or hybrid-electric motor vehicle. Thus, the respective battery electrode 1 forms an integral component of the respective battery cell, which in turn forms a component of the battery. The battery is then a component of the motor vehicle.

[0027] Fig. 1 shows a schematic view of steps S1-S4 and S5-S8, respectively, of a method for producing the flat battery electrode 1. The method is carried out on a flat conductor body 3, which is coated with active material 4, such that this conductor body 3 is first provided before step S1. The conductor body 3 can be a rigid or dimensionally stable plate. In the present case, the conductor body 3 is an elongated film that is initially wound onto a roll and unwound from the roll during the method. According to the present example, in the method for producing the respective battery electrode 1, a first conductor body surface 5 and a second conductor body surface 6 are coated with active material 4. For this purpose, the production device 2 is configured to carry out steps S1-S4 of the method.Since in this example, the second arrester body surface 6, opposite the first arrester body surface 5, is also coated with active material 4, the method according to the present example additionally comprises steps S5-S8, and the manufacturing device 2 is configured to perform steps S5-S8. Steps S5-S8 differ from steps S1-S4 in this example only in that they are performed on the second arrester body surface 6.

[0028] For coating the arrester body surfaces 5 and 6, steps S1-S4 and S5-S8 of the process are as follows: In steps S1 or S5, an active material region 7 is determined or specified on the corresponding arrester body surface 5, 6, which defines a positional orientation and shape of the active material 4 on the arrester body surface 5, 6. The active material region 7 does not extend into a region 8 of the arrester body 3 or the arrester body surface 5, 6, which is intended to function as a contact tab for the battery electrode 1. A corresponding construction plan or corresponding control commands is / are input into the manufacturing device 2, in particular into its control unit.

[0029] In step S2 or S6, an electrically conductive adhesion promoter layer 9 made of an adhesion promoter 10 is applied in the active material region 7 with precise contours directly onto the conductor body surface 5, 6 by means of an adhesion promoter application unit of the production device 2.

[0030] By means of an active material application unit of the production device 2, in steps S3 or S7, an active material layer 11 made of the active material 4 is applied to the arrester body surface 5, 6, which completely covers the active material region 7, such that the adhesion promoter layer 9 in the active material region 7 creates an adhesive bond between the arrester body 3 or its arrester body surface 5, 6 and the active material layer 11. In the present case, the active material 4 for the first arrester body surface 5 and the active material 4 for the second arrester body surface 6 are each present as a film, which is initially wound onto a respective further roll and is unwound from said roll during the process. In the present case, the production device 2 has a calendering unit, into which the arrester body 3 and the active material 4 orthe active material films are drawn in, whereby the active material 4 is laminated onto the respective active material area 7.

[0031] In step S4 or S8, a loose active material portion 12 (see also Fig. 2) the active material layer 11 applied to the arrester body surface 5, 6, which was applied to the arrester body surface 5, 6 outside the active material area 7 and is therefore not connected to the arrester body 3 by means of the adhesion promoter layer 9, by means of a removal unit 13 (see Fig. 4) is removed from the conductor body surface 5, 6, after which the battery electrode 1 is present, which - here on both sides - is partially coated with active material 4 and is free of unwanted projections of the adhesion promoter 10.

[0032] In the method, a prior geometric adjustment, in particular cutting, of the active material layer 11 or the active material 4 to the geometry of the active material region 7 as well as an exact edge alignment between the active material 4 and the active material region 7 is deliberately dispensed with. Instead, the active material 4 is roughly applied to the arrester body surface 5, 6, here laminated, in such a way that the active material region 7 is completely covered with active material 4, see Fig. 1, step S3 / S7. A geometry of the active material region 7 and a geometry of the active material 4 to be applied can differ significantly; for example, the active material region 7 - as in Fig. 1—have one or more uneven edges, whereas the active material 4 to be applied is shaped according to a rectangle. Thus, in the method, the active material 4 is only roughly positioned relative to the active material region 7 in a simple, low-complexity manner; a particularly precise and thus—particularly in terms of control technology—particularly complex fine positioning of the active material 4 relative to the active material region 7 is advantageously eliminated in the method.

[0033] Fig. Figure 2 shows a partial, sectional view of the battery electrode 1 prior to its final completion, depicting active material portions 12 that are loosely adhered to the arrester body 3 and are easily removable. A dotted line indicates a shadow 14 cast by the loose active material portions 12. As already explained, the area 8 has not been coated with adhesion promoter 10, resulting in only a loose connection between the arrester body 3 and the active material 4 in the area 8 when the active material 4 is laminated on. This allows for particularly easy removal of loose active material portions 12 from the arrester body 3.

[0034] Fig. 3 shows a schematic view of a longitudinally and transversely intermittent electrode strip comprising the conductor body 3, on whose conductor body surface 5, 6 the active material region 7 has been determined such that it has two or more active material subregions 7a along its primary extension direction x and along its secondary extension direction y. The individual active material subregions 7a are spaced from one another along the primary extension direction x by a first cutting distance 15 and along the secondary extension direction y by a second cutting distance 16, at which the electrode strip is cut to produce battery electrodes 1 for prismatically stacked or stacked battery cells, without producing any offcuts comprising active material 4.

[0035] Fig. 4 shows a schematic view of the removal of the loose active material portions 12 from the arrester body 3 by means of the manufacturing device 2 or its removal unit 13. The loose active material portions 12 are in Fig. 4 not shown. The removal unit 13 comprises, for example, a suction device, a blower, and / or a brushing device. By means of the suction device, a negative pressure is generated on a free active material surface facing away from the corresponding arrester body surface, whereby the loose active material components 12 are sucked off the arrester body surface 5, 6. By means of the blower, an overpressure is generated on the free active material surface, whereby the loose active material components 12 are blown off the arrester body surface 5, 6. A nozzle of a compressed air system can act as a blower, for example. By means of the brushing device, the loose active material components 12 are mechanically removed from the arrester body surface 5, 6. The brushing device can have a rotatable disc brush and / or a rotatable roller brush.

[0036] To prevent damage to the arrester body 3 due to the removal of the loose active material portions 12—in particular, kinking, tearing, etc.—the arrester body 3 is supported by a support unit 17, embodied here as a support roller in the example, at a removal point 18, where the loose active material portion 12 is removed from one of the arrester body surfaces 5, 6 by the removal unit 13. For this purpose, the arrester body 3 is supported on the support unit 17, in this case on the support roller, via its corresponding other of the arrester body surfaces 5, 6, so that the arrester body 3 is not damaged due to the removal of the loose active material portions 12.The manufacturing device 2 further comprises an active material collection unit, since the method according to the present example provides for the active material portions 12 removed from the conductor body surface 5, 6 to be collected by means of the active material collection unit in order to be able to efficiently recycle the detached active material portions 12. The loose active material portions 12 are conveyed into a container of the active material collection unit, in this case by means of the suction device, the blower, and / or the brushing device.

[0037] Fig. Figure 5 shows a schematic view of a bilateral removal of loose active material portions 12 from the arrester body 3, wherein the manufacturing device 2 has a separate support unit 17 and a separate removal unit 13 for each arrester body surface 5, 6. Clearly visible in Fig. 5, that respective active material portions 12 are removed from the arrester body 3 coated on both sides with active material 4, both on its first arrester body surface 5 and on its second arrester body surface 6.

[0038] Fig. Figure 6 shows a schematic view of a longitudinally intermittent electrode strip from which battery electrodes 1 are cut, the respective contour of which in Fig. 6 is shown in dashed lines. It can be seen that the active material sub-regions 7a are coated with a continuous active material layer 11. In addition, Fig.6 shows that the first cutting distance 15 is an area 8 that must be kept free of adhesion promoter 10, which also applies to the second cutting distance 16. Since the active material 4 is already removed according to the method before the longitudinally and / or transversely intermittent electrode strip is cut to size, the offcuts from the continuous electrode strip generated by the cutting process only comprise material from the arrester body 3. Thus, the offcuts from the material of the arrester body 3 and the removed active material portions 12 can be recycled particularly easily, separated from one another. List of reference symbols S1-S8 process step 1 battery electrode 2 Manufacturing device 3 arrester bodies 4 Active material 5 first arrester body surface 6 second arrester body surface 7 Active material area 7a Active material sub-area 8 Area 9 Adhesion promoter layer 10 adhesion promoters 11 Active material layer 12 loose active material portion 13 Distance unit 14 Shadows 15 first cutting distance 16 second cutting distance 17 Support unit 18 Distance point QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 3 916 845 B1

[0002] DE 10 2010 032 770 A1

[0002]

Claims

[1] Method for producing a flat battery electrode (1) for a battery cell, wherein a conductor body surface (5, 6) of a flat conductor body (3) is coated with active material (4) by S1 an active material area (7) is defined on the arrester body surface (5, 6), S2 by means of an adhesion promoter application unit in the active material area (7) an electrically conductive adhesion promoter layer (9) made of an adhesion promoter (10) is applied with precise contours directly onto the arrester body surface (5, 6), S3 an active material layer (11) made of active material (4) is applied to the arrester body surface (5, 6) by means of an active material application unit, which layer completely covers the active material region (7), so that the adhesion promoter layer (9) in the active material region (7) provides an adhesive bond between the arrester body (3) and the active material layer (11), S4 an active material portion (12) of the active material layer (11) applied to the arrester body surface (5, 6), which was applied to the arrester body surface (5, 6) outside the active material region (7), is removed from the arrester body surface (5, 6) by means of a removal unit (13). [2] Method according to claim 1, characterized by , that a second arrester body surface (6, 5) of the arrester body (3) opposite the arrester body surface (5, 6) is coated with active material (4) by S5 a second active material region (7) is defined on the second conductor body surface (6, 5), which is formed as a mirror image of the first active material region (7) or differs from the first active material region (7) in terms of positional location and / or geometry, S6 by means of the adhesion promoter application unit or another adhesion promoter application unit in the second active material area (7) a second electrically conductive adhesion promoter layer (9) made of the same or a different adhesion promoter (10) is applied directly onto the second conductor body surface (6, 5) with precise contours, S7 a second active material layer (11) made of the same or a different active material (4) is applied to the second arrester body surface (6, 5) by means of the active material application unit or a second active material application unit, which second active material layer completely covers the second active material region (7), so that the second adhesion promoter layer (9) in the second active material region (7) provides a second adhesive bond between the arrester body (3) and the second active material layer (11), S8 an active material portion (12) of the second active material layer (11) applied to the second arrester body surface (6, 5), which was applied to the second arrester body surface (6, 5) outside the second active material region (7), is removed from the second arrester body surface (6, 5) by means of the removal unit (13) or another removal unit (13). [3] Method according to claim 1 or 2, characterized by that the active material region (7) is determined such that it has two or more active material sub-regions (7a) which are spaced apart from one another along a primary extension direction (x) of the conductor body (3). [4] Method according to one of the preceding claims characterized bythat the active material region (7) is determined such that it has two or more active material sub-regions (7a) which are spaced apart from one another along a secondary extension direction (y) of the arrester body (3) running transversely to the primary extension direction (x). [5] Method according to one of the preceding claims, characterized by that the active material (4) is provided as a film or powder and laminated onto the active material region (7), in particular by means of a calender unit. [6] Method according to one of the preceding claims, characterized by that a suction device, a blower and / or a brushing device is / are used as the removal unit (13) for removing the loose active material portion (12). [7] Method according to one of the preceding claims, characterized bythat at a removal point (18) at which the loose active material portion (12) is removed from the arrester body surface (5, 6) by means of the removal unit (13), the arrester body (3) is supported by means of a support unit (17) on a second arrester body surface (6, 5) of the arrester body (3) opposite the arrester body surface (5, 6). [8] Method according to one of the preceding claims, characterized by that active material components (12) removed from the arrester body surface (5, 6) are collected by means of an active material collecting unit. [9] Battery electrode (1) manufactured according to the method according to one of the preceding claims. [10] Manufacturing device (2) for producing the flat battery electrode (1) designed according to claim 9, wherein the manufacturing device is configured to carry out the method designed according to one of claims 1 to 8. [11] Battery cell with a battery electrode (1) designed according to claim 10. [12] Battery with a battery cell designed according to claim 11. [13] Motor vehicle with a battery designed according to claim 12.

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