Method for calendering electrode tape and calender apparatus

Abstract

To provide a method for calendering an electrode tape, which can achieve higher total facility efficiency.SOLUTION: A method for electrode tape calendering has a calendering process, in which an electrode tape 37 is guided through a roller nip 15 of a pair 9 of rollers of a calendering device 1 while compressing the electrode tape. During the calendering process a defect detection step is carried out, in which at least one defect 39 of the electrode tape is directly or indirectly detected. During the calendering process, a defect is detected during the defect detection step and the pair of rollers is adjusted from a calendering position of the pair of rollers to an open position of the pair of rollers in an opening step, and this is before the defect reaches the roller gap. The defect detection step and / or the opening step is carried out, preferably automatically or fully automatically, via an open-loop and / or closed-loop control system of the calendering device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The invention relates to a method for calendering an electrode strip according to the preamble of claim 1 and to a calendering device according to claim 10. [Background technology]

[0002] In the method for calendering an electrode strip as mentioned at the beginning, a calendering process is carried out in which the electrode strip is guided through the roller nip of a roller pair of a calendering device. During the passage, the electrode strip is compressed between the solid steel rollers of the roller pair with very high roller pressure. The electrode strip may have defects resulting from production, such as spliced ​​joints or surface defects of the electrode strip. If these defects are guided through the roller nip without any corrective measures, the high roller pressure may cause significant damage to the roller pair. To prevent such damage, the calendering process has been monitored manually by an operator up to now. When the operator recognizes the defect, he interrupts the calendering process, adjusts the roller pair from the calendering position to the open position, guides the defective part through the roller nip, adjusts the roller pair to the calendering position and resumes the calendering process.

[0003] This method has the drawback of achieving very limited overall equipment effectiveness due to frequent manual interruptions.

[0004] A roll press, an open-loop and / or closed-loop control system for a roll press and an open-loop and / or closed-loop control method for a roll press are known from DE 112019001631 T5, in which a position sensor captures the leading edge of a workpiece before the leading edge enters the roller nip of the roll press. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] DE112019001631T5 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a method for calendering an electrode strip, which allows a higher overall plant efficiency to be achieved compared to known methods. A further object is to provide a calendering device with which the method for calendering an electrode strip can be carried out cost-effectively. [Means for solving the problem]

[0007] These objects are achieved by the features of the independent claims. Preferred refinements of the invention are disclosed in the dependent claims.

[0008] According to the invention, a method for calendering an electrode strip is proposed, comprising a calendering process, during which the electrode strip is guided through a roller nip of a roller pair of a calendering device while being compressed, during which a defect recognition step is carried out, during which at least one defect in the electrode strip is indirectly or directly recognized, and when a defect is recognized during the calendering process in the defect recognition step, before the defect reaches the roller pair, the roller pair is adjusted in an opening step from a calendering position of the roller pair to an opening position of the roller pair. According to the invention, the defect recognition step and / or the opening step are preferably carried out automatically or fully automatically, using an open-loop and / or closed-loop control system of the calendering device. With the defect recognition step and / or the opening step carried out by an open-loop and / or closed-loop control system, no manual monitoring or manual interruption of the method is necessary. Furthermore, the automatic opening step ensures that the defect can be guided through the roller nip without any trouble and thus without damage to the roller pair.

[0009] By indirect recognition of the defect location it is understood that the defect location and / or the position of the defect location are recognized on the basis of a mark, preferably on the basis of a mark, preferably on the basis of a color mark. By direct recognition of the defect location it is understood that the defect location and / or the position of the defect location are recognized and / or detected directly by a sensor, preferably by a CCD sensor and / or on the basis of the defect location itself.

[0010] Preferably, it can be assumed that in the calendering position of the roller pair the roller nip has a calendering nip width and / or in the open position of the roller pair the roller nip has a defect spot nip width.

[0011] Particularly preferably, it can be assumed that the defect points are classified in the defect point recognition step, whereby the defect points are classified as dangerous for the rollers or as not dangerous for the rollers. If a defect point that is not dangerous for the rollers is recognized, the opening and / or closing steps are not performed either, and the calendering process continues to operate unchanged. The calendering process is therefore interrupted or slowed down not for every defect point, but only for defect points that are dangerous for the rollers. The overall plant efficiency therefore advantageously depends in the method only on defect points that are actually dangerous for the rollers.

[0012] In a preferred embodiment, it can be envisaged that the open-loop and / or closed-loop control system has a data memory, in which data memory position information is stored, preferably for the electrode strip and / or the position of the electrode strip with respect to the longitudinal direction of the electrode strip, and that an open-loop and / or closed-loop control unit of the open-loop and / or closed-loop control system calls up and / or receives the data memory position information as a data memory signal, preferably during a defect recognition step and / or for the recognition of defect locations. The data memory position information represents, for example, a digital mark by which the strip speed of the electrode strip is reduced early and also a physical mark, preferably in the form of, for example, a color mark, which can be used to be recognized, preferably detected, by the open-loop and / or closed-loop control system.

[0013] In a particularly preferred embodiment, it can be envisaged that the open-loop and / or closed-loop control system has a sensor, and the position of the defect location of the electrode strip is recognized, preferably detected, by means of the sensor, preferably with respect to the electrode strip and / or the longitudinal direction of the electrode strip, and sensor position information about the defect location is transmitted in a defect location recognition step as a sensor signal from the sensor to an open-loop and / or closed-loop control unit of the open-loop and / or closed-loop control system. The sensor position information constitutes redundant position information with respect to the data memory position information. The advantage is that the reliability of the defect location recognition is significantly increased.

[0014] In an exemplary embodiment, it can be envisaged that the sensor is formed by a colour sensor or a CCD sensor, preferably a mark, preferably a colour mark, is applied on or parallel to at least one defect location, and the position of the defect location of the electrode strip is recognised, preferably detected, preferably with respect to the longitudinal direction of the electrode strip and / or the electrode strip, by means of the colour sensor or the CCD sensor on the basis of the mark, preferably a colour mark, applied on the defect location. The colour mark constitutes a physical mark. The colour mark is advantageous, for example, compared to recognition by a conventional sensor, since the colour mark can be easily and especially reliably detected in the process.

[0015] By way of example, it can be envisaged that the position of the at least one defect spot is detected directly by a CCD sensor, preferably in a surface control process, whereby it is preferably envisaged that the position of the defect spot is recognised and / or detected by means of a CCD sensor and not via a mark or a colour mark, but directly and / or based on the defect spot itself and / or without a pre-attached mark. For example, it can be envisaged that the at least one defect spot is recognised and / or detected by a CCD sensor, preferably directly or indirectly, before the roller nip.

[0016] For example, it can be envisaged that a mark, preferably a colour mark, is formed by the adhesive strip, preferably at least in the vicinity of the defect where the adhesive strip is at least partially exposed. According to the advantage, no special mark, preferably a colour mark or an additional adhesive sticker, is required to mark the butt joint as a defect. Instead, the defect in the form of the seam joint is recognised and / or detected directly on the basis of the adhesive strip and / or its colour. The adhesive strip may therefore preferably have the same colour as the colour mark or the adhesive sticker forming the colour mark.

[0017] In an exemplary embodiment, it can be envisaged that the open-loop and / or closed-loop control system has an unwinding splicing device, the positions of the defects in the electrode strip are recognized, preferably detected, preferably with respect to the electrode strip and / or the longitudinal direction of the electrode strip by means of the unwinding splicing device, and splicing joint position information is transmitted in a defect recognition step as a splicing signal for the positions of the defects from the unwinding splicing device to an open-loop and / or closed-loop control unit of the open-loop and / or closed-loop control system. Thus, additionally or alternatively, position information can also be determined via the unwinding splicing device. The process reliability during defect recognition is thereby further increased compared to defect recognition based exclusively on data memory position information and / or sensor position information.

[0018] It can be advantageously envisaged that the data memory position information is formed by the splicing position information, i.e. the splicing position information may be stored in the data memory as data memory position information. In this case, the splicing position information is transmitted as a splicing signal to the data memory and stored there. With the advantage, a direct signal connection does not necessarily have to be formed between the unwinding splicing coupling device and the open-loop and / or closed-loop control unit.

[0019] In a preferred embodiment, it can be envisaged that the open-loop and / or closed-loop control system has an open-loop and / or closed-loop control unit, the data memory position information being transmitted as a data memory signal and / or the sensor position information being transmitted as a sensor signal and / or the splicing position information being transmitted as a splicing signal to the open-loop and / or closed-loop control unit, preferably the signals being processed in the open-loop and / or closed-loop control unit to generate control information, which is transmitted as an opening signal to an actuator of the open-loop and / or closed-loop control system, which is controlled in an opening step with the opening signal, and the roller pair is adjusted from the calendering position to the opening position with the actuator. Thus, in the open-loop and / or closed-loop control unit, a number of position information are further processed depending on availability. During the further processing of the signals, the position information can advantageously be compared with one another, which can increase the accuracy of the localization of the defect.

[0020] In a particularly preferred embodiment, it can be envisaged that the actuator is controlled by an open-loop and / or closed-loop control unit with a control signal to adjust the roller pair to the open position before at least one defect point reaches the roller nip, and / or the actuator is controlled by an open-loop and / or closed-loop control unit with a control signal to adjust the roller pair to the open position after the electrode strip portion in front of the defect point reaches the roller nip. By means of the actuator, a particularly low-cost adjustment capability of the roller nip is realised.

[0021] For example, it may be envisaged that the electrode strip portion in front of the defect reaches the roller nip directly adjacent to the defect and / or before the defect.

[0022] By way of example, it may be assumed that the portion of the strip in front of the defect is not compressed or is not fully compressed after passing through the roller nip.

[0023] Preferably, the strip portion ahead of the defect location has a strip length, preferably seen in the running direction and / or parallel to the running direction, the value of which is preferably in the range from 5 cm to 150 cm, preferably in the range from 10 cm to 30 cm, particularly preferably about 20 cm, at an electrode strip speed preferably in the range from 25 m / min to 150 m / min. In particular, a strip length of 20 cm represents a good compromise between reducing the unused part of the electrode strip and not causing damage to the roller pair.

[0024] In an exemplary embodiment, it can be envisaged that the web speed of the electrode strip is reduced from the calendered strip speed to the defect strip speed before the defect reaches the roller nip using an open-loop and / or closed-loop control system. Alternatively or additionally, it can be envisaged that the web speed of the electrode strip is reduced from the calendered strip speed to the defect strip speed after the defect front strip part roller nip is reached using an open-loop and / or closed-loop control unit. Due to the reduction in the web speed, the amount of defects of the electrode strip in the uncalendered state can be reduced before and after the defect.

[0025] In an exemplary embodiment, the method has a closing step, in which the open-loop and / or closed-loop control unit generates and transmits a closing signal to the actuator, which is controlled in the closing step by the closing signal to position the roller pair from the open position to the calendering position by means of the actuator, preferably the actuator is controlled by the open-loop and / or closed-loop control unit by the closing signal to position the roller pair to the calendering position immediately after the defect spot rear strip portion of the electrode strip has left the roller nip, and / or preferably the actuator is controlled by the open-loop and / or closed-loop control unit by the closing signal to position the roller pair from the open position to the calendering position after at least one defect spot has left the roller nip. The closing step makes it possible for the calendering process to be continued again automatically after the defect spot has passed through the roller nip. Thus, the duration of interruptions is reduced to a minimum, so that the method allows for high overall equipment efficiency.

[0026] Exemplarily, it can be envisaged that the closing step is preferably performed automatically or fully automatically, using an open-loop and / or closed-loop control system of the calendering device, so that the method can be performed fully automatically.

[0027] By way of example, it may be envisaged that the electrode strip portion behind the defect reaches the roller nip directly adjacent to the defect and / or behind the defect.

[0028] Illustratively, it may be assumed that the post-defect strip portion is not compressed or not fully compressed after passing through the roller nip.

[0029] Preferably, the electrode strip defect site rear strip portion has a rear strip portion length in the range of 5 cm to 150 cm, preferably in the range of 10 cm to 30 cm, particularly preferably about 20 cm. In particular, a rear strip portion length of 20 cm represents a good compromise between reducing the unused part of the electrode strip and ensuring that no damage occurs to the roller pair.

[0030] It can be preferably envisaged that the web speed of the electrode strip is reduced, preferably from the calendering strip speed or the defect strip speed, to zero before the start and / or completion of the closing step, preferably by means of an open-loop and / or closed-loop control system, and that the electrode strip is then preferably increased from zero to the calendering web speed after completion of the closing step, preferably by means of an open-loop and / or closed-loop control system. According to the invention, a calendering device is further proposed, preferably for carrying out the method as described above, which further comprises an open-loop and / or closed-loop control system, through which the electrode strip can be guided in the calendering process, preferably in a continuous manner, while compressing the electrode strip. The open-loop and / or closed-loop control system is suitable and / or configured to carry out a defect recognition step, preferably automatically or fully automatically, during the calendering process and to indirectly or directly recognize at least one defect on the electrode strip. Alternatively or additionally, the open-loop and / or closed-loop control system is suitable or configured for, when a defect spot is recognized, adjusting the position of the roller pair, preferably automatically or fully automatically, from a calendering position of the roller pair, preferably with the roller nip having the calendering nip width, to an open position of the roller pair, preferably with the roller nip having the defect spot nip width. For the calendering device, the same effects as for the method apply.

[0031] It can be preferably envisaged that the electrode strip has a support element and at least one coating. It can be particularly preferably envisaged that the support element is formed by a support sheet, with the support sheet preferably only containing or at least partially containing aluminum and / or copper.

[0032] For example, it may be envisaged that the coating contains an active material and / or a binder.

[0033] Exemplarily, it can be envisaged that the calendering nip width is adjusted so that the thickness of the compressed electrode strip is between 0.05 mm and 0.5 mm.

[0034] Advantageously, the notation top roller and bottom roller is not only to be understood as an expression of spatial direction, but it can be assumed that the bottom roller may simply be referred to as one, preferably a first roller arranged in some way, and the top roller may simply be referred to as one, preferably a second roller arranged in some way.

[0035] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. [Brief description of the drawings]

[0036] [Figure 1] 1 shows a schematic side cross-sectional view of a calendering device; [Diagram 2] 2 shows a schematic side view of a defect in an electrode strip; [Diagram 3] 2 shows a schematic side view of a defect in an electrode strip; [Figure 4] 1 shows a schematic cross-sectional side view of a coating defect in an electrode strip; [Diagram 5] 1 shows a schematic side view of a splice joint of an electrode strip; [Figure 6] 1 shows a schematic side view of a splice joint of an electrode strip; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] In Fig. 1, a calendering device 1 is shown. The calendering device 1 comprises an unwinding unit 3 and a winding unit 5. The calendering device 1 further comprises a guide roller 7 and a roller pair 9. The roller pair 9 comprises a bottom roller 11 formed by a cylindrical metal roller and a top roller 13 formed by a cylindrical metal roller. The bottom roller 11 is connected to an actuator 17 of the calendering device 1, here a hydraulic actuator. However, it is of course also possible, alternatively, in the described or another embodiment of the calendering device 1 to configure the actuator 17 as, for example, an electromechanical actuator.

[0038] The unwinding unit 3 has a turret unwinding device with a first unwinding core 19 and a second unwinding core 21. Additionally, an automatic unwinding splicing device 23 arranged on the turret unwinding device is provided. The winding unit 5 has a turret winding device with a first winding core 25 and a second winding core 27, and an automatic winding splicing device 29.

[0039] The calendering device 1 has an open-loop and / or closed-loop control system, which comprises a closed-loop and / or open-loop control unit 31, a sensor 33, an actuator 17, an unwinding splicing device 23 and a data memory 35, which is here configured as a cloud memory, merely by way of example. The sensor 33 is here configured as a color sensor, merely by way of example. Alternatively, in the described or another embodiment of the calendering device 1, the sensor 33 can also be configured as a CCD sensor, i.e. as a charge-coupled device sensor.

[0040] The open-loop and / or closed-loop control unit 31 is signal-connected to a sensor 33 and to a data memory 35. The open-loop and / or closed-loop control unit 31 is further signal-connected to an actuator 17. The open-loop and / or closed-loop control unit 31 is further signal-connected to an unwind splicing device 23. The signal connections are specifically shown in FIG. 1 on the basis of a line, preferably a dashed double-dashed line, originating from the open-loop and / or closed-loop control unit 31.

[0041] Between the bottom roller 11 and the top roller 13 there is a roller nip 15. The bottom roller 11 defines the roller nip 15 below and the top roller 13 defines the roller nip 15 above. The roller nip 15 has an adjustable nip width. The nip width is adjustable from a calendering nip width, where the roller pair 9 is in the calendering position, to a defect spot nip width, where the roller pair 9 is in the open position, and vice versa, by adjusting the position of the bottom roller 11 by an actuator 17 controlled by an open-loop and / or closed-loop control unit 31.

[0042] The calendering nip width has a value smaller than the strip thickness D of the electrode strip 37 in an uncalendered state, as shown in Figure 2. The defect nip width preferably has a value larger than the defect thickness FD, as shown in Figure 2, of the defect 39 shown enlarged in Figure 2.

[0043] 2, the defect 39 is formed by a splice joint, by which the electrode strips 37 of the different electrode coils are connected to one another, in particular by interposing a double-sided adhesive strip 41 between the end of the electrode strip 37 of the first electrode coil arranged on the first unwinding core 19 and the end of the electrode strip 37 of the second electrode coil arranged on the second unwinding core 21. In the region of the splice joint, the defect thickness FD results from the sum of the double strip thickness D of the electrode strip 37 and the thickness KD of the adhesive strip 41. Alternatively to the splice joint, the defect 39 can also be formed, for example, by surface defects and / or material agglomerates and / or air bubbles.

[0044] The calendering device 1 is configured and suitable for compressing the electrode strip 37 from the uncalendered state to the calendered state in a defined manner. The electrode strip 37 has a support layer (not shown), for example formed by a support sheet containing aluminum or copper, and a coating (not shown), for example comprising, inter alia, an active material and for example a binder. In the uncalendered state of the electrode strip 37, for example the porosity may be too high. The porosity is optimally reduced, for example by calendering and / or compression. In the calendered and / or compressed state, the electrode strip 37 is further processed, for example to produce electrodes for lithium-ion batteries, allowing a higher energy density compared to electrodes made of the electrode strip in the uncalendered state.

[0045] Besides the porosity mentioned purely by way of example, the electrode strip 37 has an additional defect 39, which is here purely by way of example. If the roller nip 15 is adjusted to the calendering nip width and the electrode strip 37 with the defect 39 is guided through the roller nip 15, the roller pair 9 is damaged. For example, the damage can consist in at least one bottom roller 11 or at least one top roller 13 being deformed, or in both the bottom roller 11 and the top roller 13 being deformed.

[0046] In order to prevent damage to the roller pair 9 due to the defect 39, the roller pair 9 is adjusted fully automatically by the open-loop and / or closed-loop control system of the calendering device 1 from the calendering position of the roller pair 9 to the open position of the roller pair 9 before the defect 39 reaches the roller pair 15. In the open position of the roller pair 9, the defect 39 can pass through the roller nip without any trouble and no damage occurs to the roller pair 9. Then, when the defect 39 has passed the roller pair 9 in the running direction LR, the roller pair 9 is adjusted again by the open-loop and / or closed-loop control system from the open position back to the calendering position.

[0047] In Fig. 4, the defect point 39 is formed by a coating defect 47, purely by way of example, in the form of an air bubble. The coating defect 47 or the air bubble cannot be compressed by the rollers of the roller pair 9 without damaging the roller pair 9. Therefore, even in the case of such a coating defect 47, the roller nip 15 is opened.

[0048] In figures 5 and 6 the defect point 39 is formed by different types of splice joints. In figure 5 one strip of adhesive strip 41 is attached to the upper side of the splice joint between the electrode strips 37 and one strip of adhesive strip 41 is attached to the lower side of the splice joint between the electrode strips 37. In this case the adhesive strip 41 is respectively exposed and can be detected by the sensor 33, preferably a colour sensor. Since the adhesive strip 41 is exposed and recognized by the sensor 33, preferably a colour sensor, the adhesive strip 41 fulfills two functions besides the joining of the electrode strips of the two electrode coils, in particular by forming a mark of the splice joint and thus of the defect point 39 which can be detected by the sensor 33. In this case a colour mark, preferably an adhesive sticker, is not necessary but may be provided additionally as an option. The same applies to the seam joint shown in FIG. 6, which differs from the seam joint of FIG. 5 merely in that the adhesive strip 41 is only glued to the upper surface of the seam joint, whereas in the seam joint of FIG. 6 no adhesive strip is provided on the lower surface of the seam joint.

[0049] The method is explained in more detail below on the basis of Fig. 1. The method comprises a preparation step and a calendering process. In the preparation step, the calendering device 1 and the electrode strip 37 are prepared. In the calendering process, the electrode strip 37 is guided through the roller nip 15 of the roller pair 9 of the calendering device 1 at a predefined strip speed of the electrode strip 37, in particular while compressing the electrode strip 37 from an uncalendered state to a calendered, i.e. compressed, state.

[0050] During the calendering process, a defect recognition step is carried out fully automatically by the open-loop and / or closed-loop control system, whereby a defect 39 is recognized. Additionally, if a defect 39 is recognized during the calendering process in the defect recognition step 39, the roller pair 9 is repositioned fully automatically in one opening step by the open-loop and / or closed-loop control system from the calendering position of the roller pair 9 to the opening position of the roller pair 9 before the defect 39 reaches the roller nip 15.

[0051] The defects 39 are recognized, preferably detected, in a defect recognition step by digital recognition and / or physical recognition. In the digital recognition, data memory location information about the location of the defects 39, preferably with respect to the electrode strip 37, is stored in the data memory 35. The data memory location information is called up and received as a data memory signal by the open-loop and / or closed-loop control unit 31 of the open-loop and / or closed-loop control system. The data memory location information about the location of the defects 39 can be stored in the data memory, for example, beforehand, manually by an operator or preferably automatically by a surface control, for example with a camera system having a CCD sensor. This can be done, for example, in a coating process and / or a slitting process for producing the electrode strip 37. Surface control in a process step located before the calendering is useful to recognize defects as early as possible after their occurrence, so that corrective measures can be introduced without delay when unexpected large amounts of defects occur.

[0052] In the case of physical recognition, the position of the defect site 39 is detected by means of a sensor 33 formed by a color sensor. For that purpose, a color mark is applied onto the defect site 39 or onto the electrode strip 37 at a predetermined point parallel to the defect site 39, preferably at the edge of the electrode strip 37 or even projecting beyond the edge of the electrode strip 37, which is shown in FIGS. 2 and 3 as an adhesive sticker 42 for the sole purpose of example. The color mark or the adhesive sticker 42 is entirely optional. Alternatively to the adhesive sticker, the color mark may of course also be formed, for example, by coloring, in this or one embodiment of the method. The adhesive sticker may be applied, for example beforehand, manually by an operator and / or by automatic surface control, for example by a camera system with a CCD camera and an automatic defect marking system, onto the defect site 39 or onto the electrode strip 37 at a predetermined point parallel to the defect site, preferably at the edge of the electrode strip 37. This can be done, for example, in a coating process and / or a slitting process for producing the electrode strip 37. Surface control in process steps preceding the calendering process is useful to recognize defects as early as possible after their occurrence, so that countermeasures can be introduced without delay when unexpected mass defects occur.

[0053] The position of the defect 39 is detected by means of a color sensor on the basis of a color mark applied on the defect 39 or on the electrode strip 37 at a predetermined point parallel to the defect 39, preferably on the edge of the electrode strip 37. Subsequently, sensor position information about the position of the defect 39, preferably with respect to the electrode strip 37, is transmitted as a sensor signal from the sensor 33 to the open-loop and / or closed-loop control unit 31 of the open-loop and / or closed-loop control system.

[0054] As described here purely by way of example, if the defect point 39 is formed by a splice joint, the unwinding splicing device 23 transmits splicing information in the form of a splice signal, preferably corresponding to the position of the splice joint with respect to the electrode strip 37 or the remaining electrode strip 37, to the open-loop and / or closed-loop control unit 31 when performing the splicing process.

[0055] Thus, the open-loop and / or closed-loop control unit 31 utilizes the data memory position information, the sensor position information and the spliced ​​position information. In principle, it is sufficient for the method if the open-loop and / or closed-loop control unit 31 utilizes only one or two of the three aforementioned position information. However, if all three position information are provided, the process reliability of the method and also its accuracy are significantly increased due to the information redundancy.

[0056] In the open and / or closed loop control unit 31 the data memory position information and the sensor position information are processed into control information for the actuator 17. The control information is transmitted from the open and / or closed loop control unit 31 to the actuator as an opening signal. In the opening step the actuator 17 is controlled by the opening signal such that the roller pair 9 is adjusted from the calendering position to the opening position by the actuator 17 before the defect reaches the roller nip.

[0057] In principle, it is also possible to maintain and / or set a safety distance before the defect point 39. For that purpose, the actuator 17 is controlled by the open-loop and / or closed-loop control unit 31 by means of a control signal, in order to initiate the adjustment of the roller pair 9 to the open position after the strip portion 43 of the electrode strip 37 before the defect point has reached the roller nip 15.

[0058] As shown in Fig. 3, the defect front strip portion 43 of the electrode strip 37 is immediately adjacent to the defect 39 and reaches the roller nip 15 before, in particular before, the defect 39 as viewed in the running direction LR. As also shown in this respect in Fig. 3, the defect front strip portion 43 is uncompressed or partially compressed after passing through the roller nip 15. The defect front strip portion 43 preferably has a front strip length, as viewed in and / or parallel to the running direction LR, of 20 cm, purely by way of example.

[0059] Before the defect 39 reaches the roller nip 15, the web speed of the electrode strip 37 is already reduced by an open-loop and / or closed-loop control system from the calendered strip speed to the defect strip speed. Thus, the unused portions in the form of non-calendered electrode strip 37 before and after the defect 39 are reduced. In principle, the reduction of the web speed of the electrode from the calendered strip speed to the defect strip speed by an open-loop and / or closed-loop control system can already start after the defect front strip section 43 has passed through the roller nip 15. Following this, it is possible to increase the strip speed for long electrode strip sections with defects, for example of 200 m, with the roller nip 15 open.

[0060] The method further comprises a closing step, in which the open-loop and / or closed-loop control unit 31 generates a closing signal after the defect 39 and / or at least partially the rear strip portion of the defect has passed and / or exited the roller nip 15 and transmits the closing signal to the actuator 17. In the closing step, the actuator 17 is controlled by the closing signal such that the roller pair 9 is adjusted by the actuator 17 from the open position to the calendering position.

[0061] The actuator 17 is controlled by the open-loop and / or closed-loop control unit 31 with a control signal in a closing step such that the roller pair 9 is adjusted to the calendering position immediately after the defect area rear strip portion 45 of the electrode strip 37 has at least largely exited from the roller nip 15. Additionally, the actuator 17 is controlled by the open-loop and / or closed-loop control unit 31 with a closing signal such that the roller pair 15 is adjusted from the open position to the calendering position after the defect area has exited from the roller nip 15. The closing step is performed fully automatically by the open-loop and / or closed-loop control system of the calendering device.

[0062] The defect-post strip portion 45 of the electrode strip 37 is immediately adjacent to the defect 39 and passes through and / or reaches the roller nip 15 only after the defect 39. The defect-post strip portion 45 is not compressed, preferably only partially compressed, after passing through the roller nip 15, as shown in FIG. 3. The defect-post strip portion 45 of the electrode strip 37 has a predetermined trailing strip length. By way of example only, the value of the trailing strip length is about 20 cm.

[0063] FIG. 3 shows the defect area leading strip portion 43, the defect area trailing strip portion 45 and the defect area 39 after the defect area leading strip portion 43, the defect area trailing strip portion 45 and the defect area 39 have passed through the roller nip 15.

[0064] Before the closing step begins, the strip speed of the electrode strip 37 is reduced by an open-loop and / or closed-loop control system from the defect strip speed to zero, thus stopping the electrode strip 37. This prevents damage to the electrode strip 37 when closing the roller nip 15. After the closing step is finished, the strip speed of the electrode strip 37 is then increased again from zero to the calender strip speed. [Explanation of symbols]

[0065] 1. Calendering device 3 Unwinding unit 5. Winding unit 7 Guide roller 9. Laura Vs. 11 Bottom roller 13 Top roller 15 Roller Nip 17 Actuator 19 First Rolling Core 21 Second Rollout Core 23 Unwinding splicing device 25 First winding core 27 Second winding core 29 Winding splicing device 31 Open and / or closed loop control units 33 Sensors 35 Data Memory 37 Electrode strip material 39 Defects 41 Adhesive strip material 42 Adhesive Stickers 43 Defective area: Front belt section 45 Defective area: rear belt section 47 Defective coating LR Travel direction

Claims

1. 1. A method for calendering an electrode strip, comprising the steps of: a calendering process in which the electrode strip (37) is guided through a roller nip (15) of a roller pair (9) of a calendering device (1) while compressing said electrode strip (37), During the calendering process, a defect recognition step is carried out, during which at least one defect (39) in the electrode strip (37) is indirectly or directly recognized; A method for performing a calendering process, comprising the steps of: if a defect portion (39) is recognized in a defect portion recognition step during a calendering process, adjusting the position of the roller pair (9) from a calendering position of the roller pair (9) to an opening position of the roller pair (9) before the defect portion (39) reaches the roller nip (15), 13. A method according to claim 12, characterised in that the defect recognition step and / or the opening step are preferably performed automatically or fully automatically using an open-loop and / or closed-loop control system of the calendering device (1).

2. 2. The method according to claim 1, characterized in that the open-loop and / or closed-loop control system has a data memory (35), in which data memory location information about the electrode strip (37) and / or the location of the defect point (39) of the electrode strip (37) relative to the longitudinal direction of the electrode strip (37) is stored, and an open-loop and / or closed-loop control unit (31) of the open-loop and / or closed-loop control system calls up and / or receives the data memory location information as a data memory signal, preferably during a defect recognition step and / or for recognizing the defect point.

3. 3. The method according to claim 1 or 2, characterized in that the open-loop and / or closed-loop control system has a sensor (33) by which the electrode strip (37) and / or a position of a defect point (39) of the electrode strip (37) with respect to the longitudinal direction of the electrode strip (37) are recognized, preferably detected, and in a defect point recognition step, sensor position information about the position of the defect point (39) is transmitted as a sensor signal from the sensor (33) to the open-loop and / or closed-loop control unit (31) of the open-loop and / or closed-loop control system.

4. 4. The method according to claim 3, characterized in that the sensor (33) is formed by a color sensor or a CCD sensor, preferably with a mark, preferably a color mark, applied on or parallel to the at least one defect location (39), and the position of the electrode strip (37) and / or the defect location (39) of the electrode strip (37) with respect to the longitudinal direction of the electrode strip (37) is recognized, preferably detected, by means of the color sensor (39) or the CCD sensor on the basis of the mark applied on the defect location (39).

5. 5. The method according to claim 1, wherein the open-loop and / or closed-loop control system comprises an unwinding splicing device (23), preferably the electrode strip (37) and / or a position of the defect point (39) of the electrode strip (37) relative to the longitudinal direction of the electrode strip (37) is recognized, preferably detected, by the unwinding splicing device (23), and in a defect recognition step splicing position information about the position of the defect point (39) is transmitted as a splicing signal from the unwinding splicing position device (23) to the open-loop and / or closed-loop control unit (31) of the open-loop and / or closed-loop control system.

6. 6. The method according to claim 2, characterized in that the open-loop and / or closed-loop control system has an open-loop and / or closed-loop control unit (31) and transmits data memory position information as a data memory signal and / or sensor position information as a sensor signal and / or splicing position information as a splicing signal to the open-loop and / or closed-loop control unit (31), preferably processing the signals in the open-loop and / or closed-loop control unit (31) to generate control information and transmitting the control information as an opening signal to an actuator (17) of the open-loop and / or closed-loop control system, and controlling the actuator (17) in a releasing step with the opening signal to position the roller pair (9) by means of the actuator (17) from the calendering position to the opening position.

7. 7. The method according to claim 6, characterized in that the actuator (17) is controlled by the open-loop and / or closed-loop control unit (31) with a control signal to position the roller pair (9) in the open position before the at least one defect (39) reaches the roller nip (15) and / or the actuator (17) is controlled by the open-loop and / or closed-loop control unit (31) with a control signal to position the roller pair (9) in the open position after a front strip portion (43) of the electrode strip (37) reaches the roller nip (15).

8. 8. The method according to claim 1, wherein the strip speed of the electrode strip (37) is reduced by the open-loop and / or closed-loop control system from the calender strip speed to the defect strip speed before the defect (39) reaches the roller nip (15).

9. The method comprises a closing step, during which the open-loop and / or closed-loop control unit (31) generates and transmits a closing signal to the actuator (17), which is controlled by the actuator (17) in a closing step with the closing signal to position the roller pair (9) by the actuator (17) from an open position to a calendering position, preferably the actuator (17) is controlled by the open-loop and / or closed-loop control unit (31) with the closing signal to position the roller pair (9) after the defect point of the electrode strip (37).

9. The method according to claim 1, characterized in that the roller pair is adjusted to the calendering position immediately after the strip portion (45) has left the roller nip (15) and / or that the actuator (17) is controlled by the open-loop and / or closed-loop control unit (31) with a closing signal so that the roller pair (9) is adjusted from the open position to the calendering position after at least one defect point (39) has left the roller nip (15).

10. A calendering device preferably for carrying out the method according to any one of claims 1 to 9, comprising: a roller pair (9) through which an electrode strip (37) can be guided in a calendering process, preferably in a continuous manner, while compressing said electrode strip (37); an open-loop and / or closed-loop control system adapted and / or configured for performing a defect recognition step, preferably automatically or fully automatically, during the calendering process and for indirectly or directly recognizing (39) at least one defect location on said electrode strip (37), The open-loop and / or closed-loop control system is suitable or configured for, upon recognition of the defect, adjusting the position of the roller pair (9), preferably automatically or fully automatically, from a calendering position of the roller pair (9) to an open position of the roller pair (9).

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