Method for monitoring and calibrating optical components in the production of battery cells

Abstract

The invention relates to a method for monitoring and calibrating an optical system, in particular a laser system (10), during the processing of a web material (22) which is conveyed at an advancing speed in an advancing direction (24). According to method step a), a part web portion (44-49) is produced by performing at least one notching cut (66). According to method step b), at least one part web portion (44-49) which is produced with the at least one notching cut (66) is used as calibration surface (76, 78, 80). According to method step c), calibration marks (60, 62) are applied to the part web portions (44, 49), which are produced according to method step b), by way of deflection units (16, 18, 20) in such a way that, according to method step d), the calibration marks (60, 62) make it possible to detect any translational or rotational deviations or scaling deviations between the deflection units (16, 18, 20).

Description

[0001] Method for monitoring and calibrating optical components in battery cell manufacturing

[0002] Technical area

[0003] The invention relates to a method for monitoring and calibrating an optical system, in particular a laser system, during the processing of a web material that is conveyed at a feed rate in a feed direction. Furthermore, the invention relates to the use of the method for monitoring and / or calibrating optical systems, in particular laser systems, in the manufacture of battery cells.

[0004] State of the art

[0005] DE 10 2019 220 114 A1 discloses a calibratable laser device comprising a light source for the laser beam and a light deflection device that deflects the laser beam onto a target area, wherein at least one calibration target is arranged in the target area. The laser device further comprises an evaluation device that assigns generated measurement signals to the at least one calibration target and calibrates the light deflection device based on the measurement signals assigned to the calibration target. The method is used in particular in selective laser melting.

[0006] DE 10 2016 106 648 B4 has a calibration procedure for a

[0007] The subject of the laser processing device is a reference pattern created on an object surface using a calibrated processing unit. This reference pattern corresponds to a target pattern stored in a computing / control unit. The sensor unit records an actual pattern, which deviates from the reference pattern due to the uncalibrated sensor deflection system. A correction value for the sensor deflection system is first determined via an actual / target value comparison. It is advantageous to optically couple the sensor unit into the laser deflection system during the calibration process. During normal operation of the laser processing device, the corresponding correction values ​​stored in the correction table are then taken into account for each mirror position when the laser is deflected.

[0008] DE 199 16 081 A1 relates to a method for calibrating a device for machining workpieces, which device has at least one laser, a deflection unit, and a control unit. For calibration, a workpiece is placed in the deflection area, and a plurality of markings are applied to the workpiece using a laser. The markings are applied not by dynamic control of the deflection unit, but by stationary control. The actual locations of the markings are then determined. A correction value is determined from the difference between the actual and desired locations and input into the control unit.

[0009] WO 16 / 041 713 A1 , WO 19 / 052 881 A1 , CN 209592219 U relate to solutions for plant engineering in the production of battery cells. Here, electrode and separator material is introduced as strip material, from which individual sheets, individual sheet stacks, electrode-separator assemblies, monocells or monocell stacks are produced by laser processing. When producing individual sheets or similar using a laser, material is melted and / or evaporated using a continuous wave or a pulsed laser in order to create a contour using a laser cutting process. Basically, at least two types of cuts are always necessary. First, material is separated to produce the conductor (flag or pole piece), usually referred to as notching, and secondly there is a separation step which produces individual films / strips for further processing.

[0010] If both cuts are performed by lasers, it is unavoidable at high belt speeds of more than 0.5 m / s that the cuts are performed by several optics, for example one per cut type, because the power and scanning speeds at high belt speeds are not sufficient to image the entire cutting length within a very short cycle time.

[0011] Description of the invention

[0012] According to the invention, a method is proposed for monitoring and calibrating an optical system, in particular a laser system, during the processing of a web material which is conveyed at a feed rate in a feed direction, wherein the following method steps are carried out: a) generating partial web sections of the web material by making at least one notching incision, b) using a partial web section produced with the at least one notching incision as a calibration surface, c) applying calibration marks to the partial web sections produced according to method step b) by deflection units of the at least one optical system in such a way that d) the design of calibration marks enables detection of any translational and / or rotational deviations or scaling deviations between deflection units and serves to correct them.

[0013] By means of the method proposed according to the invention, a correction of cutting operations can be carried out at any time during production, starting from a respective actual state.

[0014] In a further advantageous embodiment of the method proposed according to the invention, in addition to method step a), a separating cut for separating electrodes from the web material is carried out by means of the optical system, in particular a laser system.

[0015] In an advantageous development of the method proposed by the invention, the calibration surfaces on one functional side of the web material are designed as moving calibration surfaces. In the method proposed by the invention, the moving calibration marks applied according to method step c) are optically measured relative to one another, in particular by capturing images and their algorithmic evaluation to determine the centers of the applied calibration marks.

[0016] In the method proposed according to the invention, the moving calibration marks are applied by all deflection units available along a processing path of the web material or, alternatively, are applied only by a subset of deflection units.

[0017] In an advantageous development of the method proposed according to the invention, the calibration marks are applied to currently active deflection units or to subsets of currently active deflection units or to activatable replacement deflection units after replacing an already active deflection unit. In the method proposed according to the invention, calibration is performed in real time such that after each deflection unit, after a subset of deflection units, or after all deflection units, an optical image is captured with an algorithmic evaluation by testing each individual partial path section.

[0018] Furthermore, in the method proposed according to the invention, a transformation calculated from the position of the centers of the set of calibration marks, in particular in the X direction and / or in the Y direction or a rotation about the Z axis, is advantageously updated by each component, in particular a single sheet or a single sheet stack.

[0019] In the method proposed according to the invention, a correction can be made during operation according to the last actual situation, so that the precision of the cutting operations can be readjusted in real time by means of the laser beam arrangement.

[0020] In the method proposed by the invention, the calibration of all x workpieces, in particular all x partial web sections and / or every y hours, is performed online at regular intervals. Alternatively, the calibration can be performed offline by selectively removing and checking individual partial web sections.

[0021] Furthermore, in the method proposed according to the invention, calibration deviations are detected optically either in the run by using a line camera that combines image lines with the aid of an encoder speed specification to form an image from which areas with calibration marks can be extracted, or as an individual image of a partial web section or in the run as an overall image with a processed electrode, whereby a direct matching of the generated geometry and the currently existing calibration is achieved.

[0022] When detecting calibration deviations optically, the method proposed according to the invention proceeds in such a way that by applying an indexing, in particular a barcode, to the partial web sections, their assignment to the workpieces, in particular electrodes, corresponding to the indexing is carried out or the detection of calibration deviations optically by means of a camera image or by means of a generated 2D image with measurement signals with color differentiations or 3D height information by OCT applications.

[0023] The method proposed according to the invention provides that, in order to identify individual deflection systems on the partial track sections used as calibration surfaces, individual systems are assigned to fixed designs of calibration marks and that an assignment of determined values ​​can be carried out via the respective uniqueness of the designs of calibration marks.

[0024] In the method proposed according to the invention, it is provided that in order to identify individual deflection systems, a legend, in particular a unique assignment of the respective calibration marks to the respective deflection system, is created dynamically for a currently existing calibration situation.

[0025] In the method proposed according to the invention, the calibration marks, indexings and / or legends are applied online by means of the optical systems, in particular the laser systems, during non-productive times during the processing of the machining task.

[0026] The method proposed according to the invention further advantageously provides that the partial web sections and / or the electrodes are positioned within a transport plane by means of a traveling clamping system.

[0027] In the method proposed according to the invention, calibrations of individual systems, in particular of an individual deflection system, are advantageously recorded and monitored over time by means of the calibration marks.

[0028] Furthermore, in the method proposed according to the invention, it is provided that, within the scope of an online calibration, the deflection units, after applying the calibration marks of the respective individual system, in particular of the individual deflection unit, carry out a measurement and combination of a deviation to a reference system, wherein the reference system can be a workpiece, in particular a partial web section or a reference edge.

[0029] In the method proposed according to the invention, the measuring technology used is arranged or positioned on-axis, in particular coaxially to the beam path of the laser device or off-axis, in any direction to a deflection unit, with respect to the deflection units.

[0030] Furthermore, the invention relates to the use of the method for monitoring and / or calibrating optical systems, in particular laser systems in the production of battery cells.

[0031] Advantages of the invention

[0032] The solution proposed by the invention ensures that, within the entire working range of the respective optics, with or without respective overlap, the required cutting operations are carried out within the required tolerances. In particular, this remedy eliminates the fact that, with indirect calibration—i.e., calibration via individual measuring systems within the scan fields—errors and variations occurring between the scan fields cannot be taken into account. Furthermore, the method proposed by the invention ensures that the system technology can be operated at almost 100% availability and that the feed systems used are always filled with material.The method proposed according to the invention avoids calibration outside the working planes, so that possible additional positioning and measurement uncertainties can be excluded.

[0033] The method proposed by the invention ensures online monitoring during the cutting process without any loss of machining time, as any number of deflection units can be calibrated relative to one another, as long as they are aligned within the strip feed direction of an electrode strip material. The calibration of the working fields takes place directly relative to one another on the same reference surface, independent of the positioning of the working fields and the deflection units along the processing lines.

[0034] The method proposed by the invention can be equally applied to all laser processes subject to the above-mentioned requirements, particularly those requiring short cycle times or very short downtimes. Furthermore, the method proposed by the invention can be applied to processes requiring multiple laser deflection units operating together on a single workpiece or a single workpiece assembly. This can be the case for laser welding, laser structuring, laser drilling, and laser cleaning processes, to name a few examples.

[0035] The method proposed according to the invention allows processing of an electrode strip material in the strip feed direction in a common working plane and can be realized independently of the orientation of the individual optics or deflection units relative to one another. This allows for significantly improved automated processing. Brief description of the drawings

[0036] Embodiments of the invention are explained in more detail with reference to the drawings and the following description.

[0037] They show:

[0038] Figure 1 Deflection units a to n and an optical detection for detecting calibration marks and any legends and indexing for correcting working field calibrations of the individual systems, represented by deflection units,

[0039] Figure 2 is a plan view of a continuous strip of active material,

[0040] Figure 3 is a plan view of isolated electrodes pointing towards the

[0041] Tape feed can be processed,

[0042] Figure 4 shows exemplary calibration marks of two systems and their relative position to each other and

[0043] Figures 5, 5.1 , 5.2 Design variants of the deflection units with on-axis measuring technology and off-axis measuring technology.

[0044] Embodiments of the invention

[0045] In the following description of the embodiments of the invention, identical or similar elements are designated by the same reference numerals, whereby a repeated description of these elements is omitted in individual cases. The figures only schematically illustrate the subject matter of the invention.

[0046] The illustration in Figure 1 shows a number of deflection units 16, 18, 20, namely a first deflection unit 16, a second deflection unit 18, and an nth deflection unit 20. All of the deflection units 16, 18, 20 are connected to an optical detection unit 12, which in turn is part of a laser system 10. By means of the laser system 10, a web material 22, as shown in Figure 2, is provided with notching cuts 66 in one of its edge regions and, if necessary, separated by separating cuts 57 into individual web sections, namely a first web section 26 shown in Figure 2, a further second web section 28, and a third web section 30.

[0047] Calibration information 14 is exchanged via the optical detection 12 with the individual deflection units shown in Figure 1, namely the first deflection unit 16, the second deflection unit 18 and the n-th deflection unit 20, which will be discussed in detail below.

[0048] Figure 2 shows a schematic plan view of a web material 22, which serves, for example, as electrode material.

[0049] On its upper side 32, the web material 22 is coated with an active material 50. The web material 22 has a side 36 opposite which is a functional side 34. In the illustration according to Figure 2, a first web section 26, a second web section 28, and a third web section 30, which can be produced later by a separating cut 57, are schematically indicated with reference to the web material 22, which is shown here as continuous.

[0050] On the functional side 34 of the web material 22, a first deflection lug 38 is shown, which is assigned, for example, to the first web section 26 to be produced later, a second deflection lug 40 is shown, which is assigned to the second web section 28 to be produced later, and a third deflection lug 42 for the third web section 30. The individual deflection lugs 38, 40, 42 are created by notching incisions 66, which are created on the functional side 34 by the laser system 10. As a result, a material residue remains on both sides of the created first deflection lug 38, the second deflection lug 40, and the third deflection lug 42 on the functional side 34 of the web material 22, namely a first partial web section 44 and a second partial web section 45, which are located on both sides of the first deflection lug 38 on the functional side 34 of the web material 22.With regard to the second deflection lug 40, this is surrounded by the already mentioned second partial web section 45 and the third partial web section 46, whereas the third deflection lug 42 is arranged between a fifth and sixth partial web section 48 or 49. During processing, the notching incision(s) 66 are carried out by the laser system 10 to produce the said first deflection lug 38, the second deflection lug 40 and the third deflection lug 42. Furthermore, as shown in Figure 3, a separating cut 57 can be produced parallel to a feed direction 24 of the web material 22, by means of which the separation of the first, second and third web sections 26, 28, 30 takes place. Further laser processes are possible.By applying the notching incision(s) 66, partial web sections 44, 45, 46, 47, 48, 49 are created which, in turn, are not required for the end product and are removed or disposed of during or at the end of the process chain. By means of the method proposed according to the invention, the sections, i.e. the first to sixth partial web sections 44 to 49, which are not required for the end product to be manufactured and are disposed of directly, are used as a calibration surface. This means that in the area which is disposed of as waste at a later point in the cutting process, calibration marks 60, 62 (cf. Figure 4) are specifically applied by the deflection units 16, 18, 20, as shown schematically in Figure 1, which calibration marks can be optically measured relative to one another by means of the optical detection 12 and the deflection units 16, 18, 20.Reference numeral 82 schematically designates a clamping system with which the web material 22 is conveyed in a processing plane in the feed direction 24.

[0051] From the illustration in Figure 3, it can be seen that individual electrodes 52, namely a first electrode 54 and a second electrode 56, are produced from the continuous web material 22, as shown in Figure 2, by making the separating cuts 57 perpendicular to the feed direction 24. Here, too, analogous to the illustration in Figure 2, the aforementioned deflection lugs are located on the functional side 34, namely, for example, the first deflection lug 38 and the second deflection lug 40, at the edges of which the notching incisions 66 run, which in turn then form the partial web sections 44-47 usable as calibration surfaces, as shown in Figure 3.

[0052] The illustration in Figure 4 shows the calibration marks 60, 62, for example applied by the first deflection unit 16 and the second deflection unit 18, in an enlarged view. Figure 4 shows that the notching notch 66 extends along the first deflection lug 38 and is shown here as an enlarged notch 68. On the third partial web section 46, which represents a waste residue to be disposed of later, there are calibration marks 60 and 62 lying one above the other in a first position 70. In a second position 72, which is located laterally next to the first position 70 in the horizontal direction, there are calibration marks 60, 62 that are also lying one above the other and are applied to the third partial web section 46 by the aforementioned deflection units 16 to 20, which are shown schematically in Figure 1.Finally, the third partial web section 46, shown in an enlarged view in Figure 4, also has superimposed calibration marks 60 and 62 in a third position 74. The illustration in Figure 4 further shows that the superimposition 64 of the calibration marks 60, 62 from a first position 70 results in a first calibration surface 76. At a position 72 there is a second calibration surface 78, at which the calibration marks 60, 62 have also undergone an overlay 64. Finally, at a third position 74 there is a third calibration surface 80, in which the calibration marks 60, 62 are also shown in superimposition 64. Figure 4 shows that all calibration surfaces 76, 78, 80 lie on the third partial web section 46, which is separated from the functional side 34 by the incision 66, 68. Reference numeral 84 denotes a first master coordinate system which is not permanently fixed.Depending on the requirements, the calibration task can either be specified by the revised geometry, which is the case with the first master coordinate system 84. Alternatively, it is possible to specify a second master coordinate system 86—as indicated in Figure 4—which is essentially applied by one of the involved deflection units 16, 18, or 20.

[0053] The calibration marks 60, 62, as shown superimposed at the first, second, and third positions 70, 72, 74 on the third partial web section 46 according to Figure 4, can be applied along the web material 22 by all deflection units 16, 18, 20 available within a processing line. Alternatively, it is possible for said calibration marks 60, 62 to be applied to the respective partial web sections 44-49 only by a subset of the available deflection units 16, 18, 20, namely, for example, the currently active deflection units 16, 18, 20 or by replacement deflection units that are activated when a replacement of an already running deflection unit 16, 18, 20 is planned. Furthermore, it is possible to use only subsets of the respectively active deflection units 16, 18, 20, compared to the master coordinate systems described above.Any combination of the above-mentioned deflection units 16, 18, 20 can also be used in any desired interaction. The respective calibration marks 60, 62 are designed such that any translational or rotational deviations as well as scaling deviations between the individual deflection units 16, 18, 20 along the processing path within the processing plane in the feed direction 24 of the web material 22 can be detected and subsequently corrected. Calibration can preferably be carried out in real time by calibrating and testing each individual notching incision 66. Furthermore, testing can be carried out in real time by regularly repeating calibration and testing of all workpieces, i.e., web sections 26, 28, 30, or every y hours.Furthermore, a calibration can also be carried out that is not carried out in real time by selectively ejecting individual partial web sections 44-49 for subsequent testing and calibration.

[0054] Any calibration deviations that may be present can be detected optically, for example, during the scan as a dedicated individual image of a tracer 38, 40, 42 or one of the partial track sections 44-49. Furthermore, calibration deviations can be detected optically during the scan of the overall image with the processed electrode 54, 56, for example, by directly matching the generated geometry with the currently existing and set calibration.

[0055] Furthermore, the calibration deviations can be recorded at a later time, for example by indexing using a barcode or similar, in order to be able to individually assign the individual partial web sections 44-49, which represent waste, to the corresponding workpieces, the first, second or third web sections 26, 28, 30. Finally, calibration deviations can be recorded by identifying them optically as a camera image or by another measuring technology generated signal map as a 2D map, for example containing 3D height information. To identify the individual deflection units 16, 18, 20 of the laser system 10 on the respective calibration section, either a fixed shape of the calibration marks 60, 62 can be assigned to the individual systems, iebe assigned to the deflection units 16, 18, 20 or a legend is created dynamically for the currently active calibration situations.

[0056] The calibration marks 60, 62, designed as circles in Figure 4, for example, and arranged at the first position 70, the second position 72, and the third position 74, can generally be of any shape (circles, crosses, or similar symbols) and in any number, as long as unambiguous coordinate systems or work area descriptions can be generated from them. All calibration marks 60, 62, indexings, or legends are always applied using one of the laser systems 10 or deflection units 16, 18, 20 and are applied in real time during the downtime provided by the actual machining task.

[0057] The individually produced deflection lugs 38, 40, 42, like the geometry of the resulting electrodes 54, 56, can be positioned within a defined plane, for example, via a clamping system 82 already indicated in connection with Figure 2, which transports the web material 22 in the feed direction 24 in the processing plane. The produced deflection lugs 38, 30, 42, like the geometry of the electrodes 54, 56, are carried along behind the last of the deflection units, for example, the nth deflection unit 20, before separation and removal of these distances takes place, either before or after a corresponding optical detection of the calibration marks 60, 62 and any legends or indexings.

[0058] The notching section 66, which is discarded during further processing, i.e., the partial track sections 44 to 49, can be positioned arbitrarily relative to the geometry of the electrodes 54, 56. Their positions depend on the position of the discharge lugs 38, 40, 42 to be produced.

[0059] Transferred to other laser processes that can be carried out with the laser system 10, the calibration marks 60, 62 can, in deviation from the procedure described above, also be applied to any non-functional geometric areas of the workpieces, ie the path sections 26, 28, 30, which are subsequently either removed, disposed of or remain as part of the workpiece, ie the path sections 26, 28, 30.

[0060] Corresponding calibration marks 60, 62 can be measured relative to one another by the optical detection 12 at the end of the passage of the workpieces, i.e., the path sections 26, 28, 30. Alternatively, real-time calibration of the deflection units 16, 18, and 20 relative to one another is also possible by measuring technology attached to the respective deflection unit 16, 18, 20, such as the cameras 96 shown in Figures 5.1 and 5.2, directly after the application of the calibration marks 60, 62 of the respective deflection unit 16, 18, 20, carrying out the measurement and compensation of the deviation from the respectively generated master coordinate system, either the first master coordinate system 84 or the second master coordinate system 86, as described in connection with Figure 4.

[0061] The measurement technology—represented by cameras 96 in Figures 5.1 and 5.2—can be on-axis, i.e., looking through one of the deflection units 16, 18, 20, or off-axis. Figures 5, 5.1, and 5.2 show that the deflection units 16, 18, 20 can be designed in different variants. Figure 5.1 shows a deflection unit comprising a scanner unit 88 and two cameras 96 in an on-axis arrangement 90, enabling on-axis measurement technology. Instead of the cameras 96 shown here, a different type of measurement technology could also be used.

[0062] In contrast, Figure 5.2 shows that a scanner unit 88 can also be assigned a measuring device in the form of the camera 96 ​​in a first off-axis arrangement 92; alternatively, it is possible to assign a measuring device, here designed as a camera 96, to the scanner unit 88 in a second off-axis arrangement 94, as also shown in Figure 5.2.

[0063] By using on-axis measurement technology in the form of the camera 96 ​​shown as an example in Figure 5.1, calibration can be performed without applying calibration marks 60, 62. For this purpose, calibration is carried out based on the reference geometries, in the simplest case using the calibration marks 60 or 62 used later on a notching section 66, i.e., on one of the partial web sections 44 to 49 to be discarded. In addition to laser application of the calibration marks 60 or 62 and measurement using the attached measurement technology, here in the form of cameras 96, measurement can be performed using an external measuring device, for example, in the form of a microscope, to record any initial position and / or scaling fields. The measurement systems, represented here by the cameras 96, measure relative to the respective deflection systems 16, 18, 20.This relative measurement can be used to replace the function of the calibration marks 60, 62 with clearly identifiable workpiece geometries, i.e. the path sections 26, 38, 30 or marks / seams / pores / edges introduced by the process itself. For example, a first generated weld seam / cut can be measured by the optical detection system 12 and thus used as a reference for a measurement by a second system. This second system is represented, for example, by a further optical detection system 12 or a further deflection unit 16, 18, 20. The 2D / 3D information from the measuring systems, for example in the form of cameras 96, can then be positioned relative to one another, whereby the actual position of the processing of a second system or further systems is adapted to the actual position or weld seam / cut.

[0064] The invention is not limited to the embodiments described here and the aspects highlighted therein. Rather, numerous modifications are possible within the scope of the claims, which are within the scope of expert practice.

Claims

Claims 1 . Method for monitoring and calibrating an optical system, in particular a laser system (10) during the processing of a web material (22) which is conveyed at a feed rate in a feed direction (24), with the following method steps: a) producing partial web sections (44, 45, 46, 47, 48, 49) of the web material (22) by making at least one notching incision (66), b) using a partial web section (44-49) produced with the at least one notching incision (66) as a calibration surface (76, 78, 80), c) applying calibration marks (60, 62) to the partial web sections (44-49) produced according to method step b) by deflection units (16, 18, 20) of the at least one optical system in such a way that d) the design of calibration marks (60, 62) enables detection of any translational and / or rotational deviations or Scaling deviations between deflection units (16, 18, 20) are possible.

2. Method for monitoring and calibration according to claim 1, characterized in that in addition to method step a) by means of the optical system, in particular a laser system (10), a separating cut (57) for separating electrodes (54, 56) from the web material (22) is carried out.

3. Method for monitoring and calibration according to claims 1 and 2, characterized in that the calibration surfaces (76, 78, 80) on a functional side (34) of the web material (22) are designed as moving calibration surfaces (76, 78, 80).

4. Method for monitoring and calibration according to claims 1 to 3, characterized in that the moving calibration marks (60, 62) applied according to method step c) are optically measured relative to one another, in particular by an image recording and its algorithmic evaluation for determining centers of the calibration marks (60, 62).

5. Method for monitoring and calibration according to claim 4, characterized in that the moving calibration marks (60, 62) are applied by all along a processing plane formed by the deflection units (16, 18, 20) which is necessary for producing the required cuts and any overall systems or by a subset of deflection units (16, 18, 20).

6. Method according to claim 5, characterized in that the calibration marks (60, 62) are applied by currently active deflection units (16, 18, 20) or by subsets of currently active deflection units (16, 18, 20) or by activatable replacement deflection units, after exchange with an already active deflection unit (16, 18, 20).

7. Method according to claims 1 to 6, characterized in that the calibration is carried out in real time in such a way that after each deflection unit (16, 18, 20) or a subset of the deflection units (16, 18, 20) or after all deflection units (16, 18, 20) an optical image recording with an algorithmic evaluation by testing on each individual partial web section (44-49) is carried out.

8. Method according to claim 7, characterized in that a transformation calculated from the position of the centers of the set of calibration marks (60, 62), in particular in the X-direction, Y-direction or a rotation about the Z-axis, is updated after each path section (26, 28, 30).

9. Method according to claims 7 and 8, characterized in that a correction can be made during operation according to the last actual situation.

10. Method according to claims 1 to 9, characterized in that the calibration is carried out online at regular intervals every x workpieces, in particular partial web sections (44-49), and / or every y hours. 11 . Method according to claims 1 to 10, characterized in that the calibration is carried out offline by targeted removal and checking of individual partial web sections (44-49).

12. Method according to claims 1 to 11, characterized in that calibration deviations are detected optically, either in a pass through using a line camera which combines image lines with the aid of an encoder speed specification to form an image from which areas with calibration marks (60, 62) are extracted as an individual image of a partial web section (44-49) or in a pass through as an overall image with a machined electrode (54, 56), whereby a direct matching of the generated geometry and the currently existing calibration is achieved.

13. Method according to claims 1 to 12, characterized in that the detection of calibration deviations is carried out optically by applying an indexing, in particular a barcode, to the partial web sections (44-49), for their assignment to workpieces corresponding to the indexing, in particular the electrodes (54, 56), or as a camera image or by means of a generated 2D image with a measurement signal with color differentiation or 3D height information by OCT application.

14. Method according to claims 1 to 13, characterized in that for the identification of individual deflection units (16, 18, 20) on the partial web sections (44-49) used as calibration surfaces (76, 78, 80), individual systems are assigned to fixed designs of calibration marks (60, 62) and an assignment of the determined values is carried out via the respective uniqueness of the designs of calibration marks (60, 62).

15. Method according to claims 1 to 14, characterized in that for the identification of individual deflection units (16, 18, 20) a legend, in particular a unique assignment of the respective calibration mark (60, 62) to the respective deflection unit (16, 28, 20) is created dynamically for a currently existing calibration situation.

16. Method according to claims 1 to 15, characterized in that the calibration marks (60, 62), indexings and / or legends are applied online by means of the optical systems, in particular laser systems (10), during non-productive times of the processing task.

17. Method according to one of claims 1 to 16, characterized in that the partial web sections (44-49) and / or the electrodes (54, 56) are positioned within a transport plane by means of a traveling clamping system (82).

18. Method according to one of claims 1 to 17, characterized in that by means of the calibration marks (60, 62) calibrations of individual systems, in particular of an individual deflection unit (16, 18, 20), are recorded and monitored over time.

19. Method according to claims 1 to 18, characterized in that within the scope of an online calibration of the deflection units (16, 18, 20) after applying the calibration marks (60, 62) of the respective individual system, in particular of the individual deflection units (16, 18, 20), a measurement and combination of a deviation to a reference system is carried out, wherein the reference system is formed by a workpiece, in particular a partial web section (44-49) or a reference edge.

20. Method according to claim 19, characterized in that the measuring technology is arranged / positioned on axis, in particular coaxial to the beam path of the laser or off axis, in particular arbitrarily to a deflection unit (16, 18, 20) with respect to the deflection units (16, 18, 20).

21. Use of the method according to one of claims 1 to 20 for monitoring and / or calibrating optical systems, in particular laser systems (10), in the manufacture of battery cells.

Images