Device for connecting a material web for producing an energy cell
By using the first and second swing elements and cutting devices in the energy battery material web connection device, the rapid and effective connection of the material web is achieved, and the problem of increasing buffer memory in the prior art is solved, and the cost and space requirements are reduced.
Patent Information
- Application Number
- CN202380071140.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-10-04
- Filing Date
- 2023-09-22
- Publication Date
- 2025-05-16
AI Technical Summary
The prior art is difficult to quickly and efficiently connect material webs for energy batteries without adding buffer memory, especially when production speeds continue to increase.
A device is adopted, the device comprising first and second swing elements and a cutting device. The web starting end of the new material web is accelerated by the first swing element and is transported synchronously with the unrolled material web, and is connected between the swing elements through adhesive strips to achieve dynamic splicing.
The rapid and effective connection of material webs is achieved, the demand for buffer memory is reduced, the space and cost requirements of the facilities are reduced, and potential failures caused by increased material thickness in the connecting area are avoided.
Smart Images
Figure CN120019012A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a device for connecting material webs, in particular electrode webs, for producing energy cells according to the preamble of claim 1 and a corresponding method according to the preamble of claim 17 . Background Art
[0002] Energy cells or energy storage devices in the sense of the present invention are used, for example, in motor vehicles, other land vehicles, ships, aircraft, or in stationary installations, such as photovoltaic installations in the form of batteries or fuel cells, in which particularly large amounts of energy must be stored for a long time. For this purpose, such energy cells have a structure formed by a stack of materials, which usually consists of an anode material on a conductor foil and a cathode material on a conductor foil and a separator foil, wherein the separator foil is arranged between the anode material and the cathode material. Such a material composite can be present in the energy cell in a stacked, rolled or folded arrangement.
[0003] In order to achieve higher production speeds, the materials for anodes, cathodes and separators are processed as much as possible as material webs. In this case, the material webs, which can be semi-finished products or intermediate products, are usually provided as tubes or coils or are transported in this form between different facilities. The tubes inevitably have a limited web length. In order to achieve the highest possible production rate and thus reduce production costs, it is advantageous to use endless webs for high-speed continuous production, so that the unwound (ablaufende) material web can be connected to the new material web. In order to ensure continuous production, process storage or buffer storage is known, which is a kind of buffer, so that the connection of two material webs can be established to achieve endless webs, and the next production process is operated using the material web from the buffer storage. However, the continuous increase in the production speed of energy cells, such as lithium-ion batteries, cannot be compensated by the ever-increasing buffer storage, so the connection process should be implemented as dynamically as possible during the conveying process, for example at the production speed, so as to reduce the buffer storage as much as possible or completely omit the buffer storage. The omission of the buffer storage reduces the space requirement of the facility and also brings potential cost benefits. Summary of the invention
[0004] It is therefore an object of the present invention to provide a device and a method which allow the material webs to be connected as quickly and efficiently as possible.
[0005] This object is achieved by the features of the independent claims. Further preferred embodiments of the invention can be gathered from the dependent claims, the drawings and the corresponding description.
[0006] A device for connecting material webs, in particular electrode webs, for producing energy cells is proposed, wherein an unwound material web can be connected to a new material web. It is proposed that a first pivoting element for the new material web and a second pivoting element for the unwound material web are provided, wherein the first pivoting element is provided for holding (holding, grasping) the web start of the new material web and the second pivoting element is provided for pivoting the unwound material web in the direction of the first pivoting element. A cutting device is provided, which is provided for slitting or weakening the unwound material web deflected by the second pivoting element at a slitting line to produce a web end of the unwound material web. The device is provided for accelerating the web start of the new material web by means of the first pivoting element and synchronizing it with the unwound material web at a speed with which the web end of the unwound material web deflected by the second pivoting element is conveyed. The web start of the new material web and the web end of the unwound material web can be connected to each other between the first and second pivoting elements by at least one adhesive strip.
[0007] The proposed device enables two material webs for producing energy cells, in particular accumulators, such as lithium-ion batteries, to be connected together, wherein the conveying speed can be maintained during the connection process. The two material webs are preferably connected together in a connection section in which the two material webs are conveyed at the same or synchronous speed. For the continuous provision of material webs, such as electrode webs, that is to say conductor foils coated with anode material or anode material, a buffer store or process store can be omitted with the proposed device.
[0008] In an advantageous embodiment, the web start of a new material web and the web end of the unwound material web can be connected one behind the other between the first and the second pivoting element.
[0009] The material webs can thus preferably be joined without overlapping. The material webs joined by at least one adhesive strip are thus preferably butted. The proposed device allows for dynamic joining of material webs without a significant increase in the thickness of the material webs. The increase in thickness at the joining point is caused only by the adhesive strip. This avoids possible malfunctions in subsequent processes due to an increase in material thickness in the joining region in the event of an overlap. The proposed device is therefore particularly suitable for relatively thick material webs of energy cells, such as electrode webs.
[0010] According to an advantageous development, it is provided that the first and second pivoting elements roll relative to one another in the connecting section, wherein the new material web and the unwound material web are arranged one behind the other and respectively between the first and second pivoting elements.
[0011] This allows the advantageous guiding of the material web between the oscillating elements. In addition, a pressing force or a counter bearing for applying at least one adhesive strip can be achieved in a simple manner.
[0012] Furthermore, according to an advantageous development, it is provided that the second pivoting element is provided for deflecting the unwinding material web without slipping. Therefore, the movement of the second pivoting element is preferably synchronized with the speed of the unwinding material web.
[0013] It is also proposed that the second swing element is arranged to press the unwinding material web toward the first swing element during deflection. By deflection, it can be ensured, for example, that the unwinding material web is well attached to the contact surface of the second swing element.
[0014] In an advantageous embodiment, the unwound material web can be clamped between the first pivoting element and the second pivoting element, while at the same time the unwound material web can continue to be conveyed along the conveying device.
[0015] The clamping thus prevents a relative movement of the material web and the two oscillating elements, which roll relative to each other at the transport speed of the material web. This is advantageous for applying one or more adhesive strips between the web start of a new material web and the web end of an unwound material web, since there is no relative movement between the oscillating elements oscillating synchronously with the material web and the material web, despite the continued transport of the material web.
[0016] In an advantageous embodiment, the second pivoting element is a counterholder for the unwound material web when it is cut or weakened by the cutting device.
[0017] The second pivoting element can thus move the unwound material web toward the cutting device and at the same time serve as a counterholder for cutting off the remaining part of the unwound material web.
[0018] According to a further development, it is provided that the cutting device is a knife drum which is operated synchronously with the second pivoting element during the cutting or weakening, wherein the unwound material web passes between the second pivoting element and the cutting device.
[0019] In this way, the rotatable knife roller can be arranged stationary in the device, while the unwinding material web is moved toward the knife roller by the second oscillating element.
[0020] The second oscillating element is preferably used as the reverse bearing for the knife roller.Swinging synchronously with the knife roller through the second oscillating element helps the material web of the unwinding to have no deflection of slipping as far as possible during the conveying process.
[0021] Furthermore, it is proposed that the unwound material web is unwound from a tube which is arranged on a tube holder, wherein the device is provided to decelerate the tube compared to the conveying speed after the unwound material web has been weakened at the slitting line.
[0022] The weakening of the unwound material web can be, for example, perforated at the slitting line. In this way, the unwound material web can be cut at the produced slitting line at a later time after the weakening at the slitting line has occurred by increasing the tensile stress in the unwound material web. The increase in tensile stress can be achieved in particular by a relative deceleration of the tube with the unwound material web compared to the conveying speed. If the unwound material web is clamped between two oscillating elements, which preferably oscillate at the conveying speed and roll against each other, it is particularly advantageous to achieve the cutting at the slitting line by decelerating the tube. The cutting preferably takes place before the slitting line comes into contact with one of the two oscillating elements.
[0023] In another advantageous embodiment, a tube opener is arranged on the first pivoting element. The tube opener is provided for opening a tube with a new material web and for receiving a pre-tensioned portion of the new material web of the tube.
[0024] The preparations for dynamically joining the material webs can thus be automated, thereby enabling a fully automated joining process of two material webs.
[0025] Furthermore, it is proposed that a pretensioning element is provided for winding up and tensioning the pretensioning part of the new material web.
[0026] The pre-tensioning element can be used to roll up the pre-tensioned portion of the new material web (for example with the wrapping paper or the first layer) and accordingly remove it. In addition, the pre-tensioning element can also be used to roll up the remaining portion of the new material web after slitting by the cutting unit at the slitting line and also dispose of it. In addition, the pre-tensioning element can preferably transfer the new material web from the tube opener of the first oscillating element.
[0027] According to a development, it is provided that the device has a cutting unit and a reversing element, wherein the cutting unit and the reversing element are provided for cutting the new material web in order to produce a web start of the new material web.
[0028] In this way, the cutting of the new material web can be achieved on the first swivel element while the new material web is resting on the first swivel element. The cutting element and the counter element are preferably supported independently of the first swivel element so that they cannot swivel together with the swivel element. The first swivel element can thus be designed to be simpler, thereby reducing the moving mass. The cutting element and the counter element can preferably be moved, for example, from the rear wall of the device into the plane of the material web. The first swivel element can preferably be swung together with the new material web to the position of the cutting element and the counter element so that the cutting element together with the counter element can cut or substantially weaken the new material web.
[0029] The cutting unit is preferably arranged in a recess in the contact surface of the first pivoting element for the material web.
[0030] The recess in the contact surface for the material web is thus at least partially covered by the abutting material web. The contact surface for the material web of the first swaying element preferably corresponds to the contact surface of the first swaying element, so that the first and second swaying elements can roll against each other using the contact surface, wherein the material web can be arranged in the gap.
[0031] In an advantageous embodiment, the cutting unit can be moved, in particular, from a plane outside the path of the material web into the recess of the first pivoting element. Furthermore, when slitting a new material web, the cutting unit is preferably moved radially outward perpendicularly to the pivot axis of the first pivoting element. During the slitting process, the counter element is preferably stationary and bears against the side of the new material web facing away from the first pivoting element.
[0032] Therefore, the web starting end preferably abuts on the counter element after the cutting process and further preferably covers at least a part of the recess.In an advantageous embodiment, the new material web can also be fixed between multiple parts of the contact surface of the first swinging element and multiple parts of the counter element.
[0033] Furthermore, it is proposed that an applicator for the adhesive strip is arranged on the first pivot element, said applicator being displaceable radially perpendicularly to the pivot axis of the first pivot element.
[0034] The applicator is preferably arranged on the first oscillating element. Furthermore, the applicator is preferably arranged in a recess in the contact surface for the material web in the first oscillating element. In this way, a portion of the adhesive strip can be applied to the web start end of the new material web formed by cutting. In this case, the counter element can also serve as a support for applying the adhesive strip. After the slitting process, the cutting unit is preferably moved out of the plane in which the material web is transported.
[0035] According to one refinement, it is proposed that the applicator is arranged in a recess in the contact surface of the first oscillating element for the material web. In this way, the applicator can apply the adhesive strip from one side to the web start of a new material web. In a preferred embodiment, the applicator and the cutting unit are located in the same recess, wherein only the applicator is connected to the oscillating element and the cutting unit can be moved into the recess.
[0036] It is also proposed that a provision unit for providing the adhesive strip is provided, which is configured to transfer the adhesive strip to the applicator. In particular, the adhesive strip can be transferred to the applicator arranged on the first oscillating arm in the transfer position of the first oscillating element. The transfer of at least one adhesive strip from the provision unit can be carried out automatically, whereby preparatory measures for dynamically connecting the material webs can also be automatically executed.
[0037] In order to achieve this object, a method is also proposed for joining material webs for producing energy cells using a device according to any one of claims 1 to 16 . BRIEF DESCRIPTION OF THE DRAWINGS
[0038] The present invention is described below with reference to the accompanying drawings according to preferred embodiments.
[0039] Figure 1 A device for joining material webs is shown, with the first oscillating element being in a transfer position for the adhesive strip;
[0040] Figure 2 A device for joining material webs is shown, wherein the applicator is located in the first oscillating element when transferring the adhesive strip;
[0041] Figure 3 A device for joining material webs is shown, the applicator having an adhesive strip transferred from a providing unit;
[0042] Figure 4 A device for connecting material webs is shown, having a bobbin with a new material web, which is opened by a first swinging element;
[0043] Figure 5 A device for connecting material webs is shown, a new material web being handed over to the pretensioning element;
[0044] Figure 6 A cut-off portion with a first oscillating element having a cutting unit and a counter element is shown;
[0045] Figure 7 A section with a first oscillating element is shown, with the adhesive strip being applied to the web start end of a new material web;
[0046] Figure 8 A device for connecting material webs is shown, with the swing element with a new material web being located in a waiting position;
[0047] Fig. 9 The device for joining material webs is shown with the swinging element in the waiting position and the knife cylinder moved out from the rear wall;
[0048] Fig.10 An apparatus for joining material webs having an accelerated oscillating element is shown;
[0049] Fig.11 An apparatus for connecting material webs when producing an adhesive bond is shown;
[0050] Fig.12 An apparatus for joining material webs is shown, having joined material webs;
[0051] Fig.13 The webs of material connected with adhesive strips are shown from the back; and
[0052] Fig.14 The material webs connected with adhesive strips are shown from the front. DETAILED DESCRIPTION
[0053] Figures 1 to 12 1 shows a device 10 for connecting material webs 11, 12 for producing energy cells. The material webs 11, 12 are, for example, conductor foils coated with anode material or cathode material.
[0054] Figure 1 The conveying of a material web 11 unwound from a tube 20, which is inserted into a tube support 22, is shown. The material web 11 is conveyed at the conveying speed to the next process for producing energy cells or accumulators. In order to convey endless material webs 11, 12 continuously to the subsequent process, the material web 11 of the tube 20 is connected to a new material web 12 before the end of the tube 20. The connection of the material webs 11, 12 preferably takes place at full conveying speed, so that no or, in an alternative embodiment, only a small buffer store for the unwound material web 11 is required.
[0055] The device 10 has a first swing element 13 and a second swing element 14, which can be rotated independently of each other about a swing axis 33, 34 by means of a servomotor. Figure 1In the state shown, it is in a transition position in which the first swivel element 13 faces a provision unit 32 for the adhesive strip 19. The first swivel element 13 has a recess 31 in a curved contact surface 36 for the material webs 11, 12. An applicator 30 is arranged in the recess 31 and can be moved in the first swivel element 13 in a radial direction. Figure 1 The middle applicator 30 is in the retracted position.
[0056] The second pivoting element 14 also has a curved contact surface 35 for the material webs 11 , 12 and is Figure 1 In the illustration of , it is in a position in which the second pivoting element 14 has no contact with the unwound material web 11 .
[0057] Figure 2 The applicator 30 for transferring the adhesive strip 19 from the providing unit 32 is radially moved out to a transfer position, so that the adhesive strip 19 can preferably be transferred by the applicator 30 outside the recess 31.
[0058] Adhesive strip 19 Figure 3 The adhesive strip 19 is transferred by the applicator 30 and is held, for example, by means of negative pressure. The applicator 30 with the adhesive strip 19 is pulled back to the waiting position in the recess 31 in the direction of the swing axis 34. In this way, the adhesive strip 19 is ready for connecting the material webs 11 and 12.
[0059] Figure 4 A new bobbin 21 with a new material web 12 on a bobbin receiver 23 is shown, which is arranged on a turntable 24 together with a bobbin receiver 22 with an unwound material web 11 .
[0060] The first oscillating element 13 has a tube opener 25, which is used to open and grasp the tube 21. The tube opener 25 is arranged in front of the contact surface 36 or in the conveying direction of the provided oscillating movement, so that the material web 12 grasped from the tube 21 is guided on the curved contact surface 36 under the oscillating movement of the first oscillating element 13, which Figure 5 Visible in.
[0061] exist Figure 5 It can also be seen how the new material web 12 is handed over to the pretensioning element 26. The pretensioning element 26 can roll up the pretensioned portion 27 of the new material web 12 and dispose of the wrapping paper or the first layer, for example.
[0062] Figure 6In a section, the slitting process of a new material web 12 is shown in order to produce a defined web start 16 of the new material web 12. The cutting unit 28 and the counter element 29 are moved from the rear plane of the device 10 into the path of the new material web 12. The first pivoting element 13 is in a rotational position in which the cutting unit 28 can be brought into the recess 31, while the applicator 30 with the adhesive strip 19 remains in a waiting position. The counter element 29 rests on the side of the material web 12 facing away from the recess 31.
[0063] The cutting unit 28 then moves in the direction of the counter element 29 and cuts off the pre-tensioned portion 27 of the new material web 12 on the counter element 29. The cut pre-tensioned portion 27 is rolled up by the pre-tensioning element 26 and then disposed of.
[0064] exist Figure 7 In the next step shown in FIG. 1 , the applicator 30 applies the adhesive strip 19 to the web start 16 of the new material web 12, wherein the new material web 12 only partially covers the adhesive strip 19. The counter element 29 serves as a support during the application of the adhesive strip 19. The counter element 29 also temporarily serves as a fixing aid for the newly formed web start 16 after the new material web 12 is cut. The adhesive strip 19 and thus also the web start 16 of the new material web 12 can be held on the applicator 30, for example, by negative pressure.
[0065] Figure 8 2 shows the first pivoting element 13 in the waiting position. The material web 12 is wound again onto the tube 21 as required. Thus, the preparation of the new material web 12 for connecting with the unwound material web 11 is completed.
[0066] In addition, if Fig. 9 As shown in FIG, the knife roller 17 moves out of the rear plane, wherein the unwound material web 11 passes between the knife roller 17 and the second swing element 14. Thus, the preparation of the device 10 for connecting a new material web 12 to the unwound material web 11 is completed. Now, splicing can be started according to the unwound state of the tube 20 and according to the remaining web length of the unwound material web 11.
[0067] In this advantageous embodiment, the unwound material web 12 can be fed further from the bobbin 20 in preparation for the next process for producing a battery.
[0068] Fig.10 and 11 The actual process of connecting the unwound material web 11 to the new material web 12 through the device 10 is shown in FIG.
[0069] Fig.10In the embodiment of the present invention, the first and second oscillating elements 13, 14 are accelerated, wherein the first oscillating element 13 also accelerates the web start 16 with the adhesive strip 19 to the conveying speed. The second oscillating element 14 also accelerates the unwound material web 11 which is being conveyed further at the conveying speed and deflects it in the direction of the driven knife roller 17. The knife roller 17 cuts the deflected, unwound material web 11 at the slitting line 18 while forming the web end 15 of the unwound material web 11. The second oscillating element 14, which oscillates at a speed synchronous with the unwound material web 11, serves as a counter-support for the knife roller 17. The knife roller 17 and the two oscillating elements 13, 14 have a synchronous speed at the moment of slitting or weakening at the slitting line 8, such as the process speed or the conveying speed of the unwound material web 11. In a possible embodiment, the tube 22 can be braked after it has been slit or weakened by the knife roller 17 at the slitting line 18, so that the unwound material web 11 is slit after being weakened at the slitting line 18.
[0070] Furthermore, the unwound material web 11 is clamped between the first and second oscillating elements 13, 14 in this advantageous embodiment, wherein the unwound material web 11 continues to be transported at the transport speed. The contact surfaces 35, 36 together with the unwound material web 11 therebetween roll against each other during the synchronous oscillating movement of the first and second oscillating elements 13, 14.
[0071] Fig.11 The device 10 is shown at a later time. The first and second oscillating elements 13, 14 continue to oscillate in the conveying direction following the conveying direction of the unwound material web 11. The web end 15 of the unwound material web 11 formed by the knife roller 17 abuts against the free area of the adhesive strip 19, which is bonded with its other part to the web start 16 of the new material web 12. The adhesive strip 19 is supported by the applicator 30, so that together with the contact surface 35 of the second oscillating element 14, a pressing force is generated on the adhesive strip 19 on the web end 16 of the unwound material web 11. As a result, the web end 15 of the unwound material web 11 can be connected to the web start 16 of the new material web 12 without overlapping.
[0072] The material webs 11, 12 connected in this way by means of the adhesive strip 19 are subsequently unwound from the tube 21, so that the connecting process is completed and a new material web 12 is replaced while the material webs 11, 12 are continuously transported, which is Fig.12. The tube 21 with the new material web 12 can then be rotated with the turntable 24 to the position of the tube 22, so that the new material web 12 finally becomes the unwound material web 11 and enables the conveying of endless material webs 11, 12. Therefore, the splicing at the joint of the material webs 11, 12 can be produced at process speed, so that the speed of the next process of producing energy cells, in particular storage batteries, does not have to be reduced for the connection process.
[0073] Fig.13 The material webs 11 , 12 connected by means of an adhesive strip 19 are shown schematically from the rear. Fig.14 The same connection is shown in the front view. In particular, it can be seen that the web end 15 of the unwound material web 11 and the web start 16 of the new material web 12 do not overlap.
[0074] Reference numerals list
[0075] 10 Installation
[0076] 11 Unwinding material web
[0077] 12 New material webs
[0078] 13. First swing element
[0079] 14 Second swing element
[0080] 15 Web end
[0081] 16 Web start end
[0082] 17 Cutting device
[0083] 18-point cutting line
[0084] 19 Adhesive Strips
[0085] 20 Unwinding bobbins
[0086] 21 New Bobbins
[0087] 22 Bobbin holder
[0088] 23 Bobbin support
[0089] 24 turntable
[0090] 25 Bobbin Opener
[0091] 26 Pre-tensioning element
[0092] 27 Pre-tensioning part
[0093] 28 cutting units
[0094] 29 Reverse element
[0095] 30 applicators
[0096] 31 Vacant Department
[0097] 32 units provided
[0098] 33 Swing axis
[0099] 34 Swing axis
[0100] 35 contact surface
[0101] 36 contact surfaces
Claims
1. A device (10) for connecting material webs (11, 12), in particular electrode webs, for producing energy cells, wherein: The unwound material web (11) can be connected to a new material web (12), characterized in that: - a first oscillating element (13) for the new material web (12) and a second oscillating element (14) for the unwound material web (11), wherein: - the first oscillating element (13) is arranged to hold the starting web end (16) of the new material web (12), the second oscillating element (14) is arranged to deflect the unwound material web (11) in the direction of the first oscillating element (13), and a cutting device (17) is provided, which is arranged to slit or weaken the unreeled material web (11) deflected by the second oscillating element (14) at a slitting line (18) to produce a web end (15) of the unreeled material web (11), wherein - the device (10) is configured to: - the web start (16) of the new material web (12) is accelerated by means of the first oscillating element (13) and synchronized with the unwinding material web (11) at a speed at which the web end (15) of the unwinding material web (11) deflected by the second oscillating element (14) is conveyed, wherein: The web start (16) of the new material web (12) and the web end (15) of the unwound material web (11) can be connected to one another between the first and second oscillating elements (13, 14) by at least one adhesive strip (19).
2. The device (10) according to claim 1, characterized in that The web start (16) of the new material web (12) and the web end (15) of the unwound material web (11) can be connected in tandem between the first and second oscillating elements (13, 14).
3. The device (10) according to claim 1 or 2, characterized in that The first swinging element (13) and the second swinging element (14) roll relative to each other in a connecting section, wherein the new material web (12) and the unwound material web (11) are arranged one behind the other and respectively between the first swinging element (13) and the second swinging element (14).
4. The device (10) according to any one of the preceding claims, characterized in that The second oscillating element (13) is provided for deflecting the unwound material web (11) without slipping.
5. The device (10) according to any one of the preceding claims, characterized in that The second oscillating element (14) is provided for pressing the unwound material web (11) against the first oscillating element (13) during deflection.
6. The device (10) according to any one of the preceding claims, characterized in that The unwound material web (11) can be clamped between the first swing element (13) and the second swing element (14), while at the same time the unwound material web (11) can continue to be transported in a transport direction.
7. The device (10) according to any one of the preceding claims, characterized in that The second oscillating element (14) is a counter-holder for the unwound material web (11) when it is cut or weakened by the cutting device (17).
8. The device (10) according to claim 7, characterized in that The cutting device (17) is a knife roller (17) which runs synchronously on the second oscillating element (14) during cutting or weakening, wherein the unwound material web (11) passes between the second oscillating element (14) and the cutting device (17).
9. The device (10) according to any one of the preceding claims, characterized in that The unwound material web (11) is unwound from a tube (20) which is arranged on a tube holder (22), wherein the device (10) is configured to decelerate the tube (20) compared to a conveying speed after the unwound material web (11) has been weakened at the slitting line (18).
10. The device (10) according to any one of the preceding claims, characterized in that A tube opener (25) is arranged on the first oscillating element (13), which is designed to open a tube (21) with a new material web (12) and to receive a pre-tensioned portion (27) of the new material web (12) from the tube (21).
11. The device (10) according to any one of the preceding claims, characterized in that A pretensioning element (26) is provided for rolling up and tensioning a pretensioning portion (27) of the new material web (12).
12. The device (10) according to any one of the preceding claims, characterized in that The device (10) has a cutting unit (28) and a reversing element (29), wherein the cutting unit (28) and the reversing element (29) are configured to cut the new material web (12) to produce a web start end (16) of the new material web (12).
13. The device (10) according to claim 12, characterized in that The cutting unit (28) is arranged in a recess (31) in a contact surface of the second oscillating element (13) for the material web (11, 12).
14. The device (10) according to any one of the preceding claims, characterized in that An applicator (30) for the adhesive strip (19) is arranged on the first oscillating element (13), said applicator being movable radially perpendicularly to the oscillation axis (34) of the first oscillating element (13).
15. The device (10) according to claim 14, characterized in that The applicator (30) is arranged in a recess (31) in a contact surface of the first oscillating element (13) for the material web (11, 12).
16. The device (10) according to claim 14 or 15, characterized in that A provision unit (32) for providing an adhesive strip (19) is provided, which is configured to transfer the adhesive strip (19) to the applicator (30).
17. Method for connecting material webs (11, 12) for producing energy cells, characterized in that The method is carried out using a device according to any of the preceding claims.