Device for connecting material webs for the production of energy cells
Patent Information
- Application Number
- EP2023776933
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-04
- Filing Date
- 2023-09-22
- Publication Date
- 2025-08-13
AI Technical Summary
The increasing production speeds of energy cells, such as Li-ion batteries, cannot be effectively maintained with ever-larger buffer storage, necessitating a dynamic connection process for material webs to minimize or eliminate buffer storage and reduce production costs and space requirements.
A device with first and second pivoting elements and a cutting device allows for the synchronization and connection of material webs at the same speed, using an adhesive strip to connect the new material web to the running material web without overlap, enabling continuous production without the need for buffer storage.
This solution allows for dynamic splicing of material webs at high speeds, maintaining production efficiency and reducing potential disruptions from increased material thickness, making it suitable for thick electrode webs, and enabling fully automatic connection processes.
Smart Images
Figure 1.1
Abstract
Description
[0001] Device for joining material webs for the production of energy cells
[0002] The present invention relates to a device for connecting material webs for the production of energy cells, in particular electrode webs according to the preamble of claim 1, and to a corresponding method according to the preamble of claim 17.
[0003] Energy cells or energy storage devices within the meaning of the invention are used, for example, in motor vehicles, other land vehicles, ships, aircraft, or even in stationary systems, such as battery cells or fuel cells, in which very large amounts of energy must be stored over longer periods of time. For this purpose, such energy cells have a structure made of materials layered on top of one another, which generally consist of an anode material on a conductor foil and a cathode material on a conductor foil and a separator foil, with the separator foil being arranged between the anode material and the cathode material. Such a material composite can be present in an energy cell in a stacked, rolled, or folded arrangement.
[0004] To achieve high production speeds, the materials for the anode, cathode, and separator are processed as material webs wherever possible. The material webs, which can be semi-finished or intermediate products, are usually delivered as reels or coils or transported in this form between different systems. Reels inevitably have a limited web length. To achieve the highest possible production rate and thus also keep production costs low, continuous production at high speed with an endless web is advantageous, so that each expiring material web is connected to new material webs.To ensure continuous production, process storage units or buffer storage units are known. These act as a buffer so that two material webs can be joined to form a continuous web, while the rest of the production process is operated using the material web from the buffer storage unit. However, increasing production speeds in the manufacture of energy cells, such as lithium-ion batteries, cannot be compensated for by ever larger buffer storage units. Therefore, the joining process should be carried out as dynamically as possible during conveying, for example at production speed, in order to keep the buffer storage unit as small as possible or to dispense with it entirely. Eliminating a buffer storage unit reduces the space required by a system and also offers potential cost advantages.
[0005] It is therefore the object of the invention to provide a device and a method which enable the fastest and most efficient possible connection of material webs.
[0006] The object is achieved by the features of the independent claims. Further preferred embodiments of the invention can be found in the dependent claims, the figures, and the associated description.
[0007] A device for connecting material webs for the production of energy cells, in particular electrode webs, is proposed, wherein an unwinding material web can be connected to a new material web. It is proposed that a first pivoting element be provided for the new material web and a second pivoting element be provided for the unwinding material web, wherein the first pivoting element is designed to hold the web start of the new material web, and the second pivoting element is designed to deflect the unwinding material web in the direction of the first pivoting element. A cutting device is provided which is designed to sever or weaken the unwinding material web deflected by the second pivoting element at a severing line, thereby producing a web end of the unwinding material web.The device is configured to accelerate the beginning of the new material web with the first pivoting element and to synchronize it with the outgoing material web, preferably in a connecting section, at the speed at which the end of the outgoing material web, which is deflected by the second pivoting element, is conveyed. The beginning of the new material web can be connected to the end of the outgoing material web between the first and second pivoting elements by at least one adhesive strip.
[0008] The proposed device makes it possible to join two material webs for the production of an energy cell, in particular a battery cell, for example a Li-ion battery, while maintaining the conveying speed during the joining process. Preferably, the two material webs are joined in a joining section, in which both material webs are conveyed at the same or synchronous speed. For the continuous supply of a material web, for example, an electrode web, i.e., a conductor foil coated with anode or cathode material, the proposed device eliminates the need for a buffer or process memory.
[0009] In an advantageous embodiment, the web start of the new material web and the web end of the running material web can be connected one after the other between the first and second pivoting element.
[0010] The material webs can therefore preferably be joined without overlapping. The material webs connected by the at least one adhesive strip are therefore preferably butt-to-butt. With the proposed device, a dynamic splicing of the material webs can be achieved without significant thickening of the material web. The increase in thickness at the connection point results solely from the adhesive strip. This can prevent potential disruptions that can occur in subsequent processes due to the increased material thickness in the connection area upon overlap. The proposed device is therefore particularly suitable for comparatively thick material webs of an energy cell, such as electrode webs.
[0011] According to an advantageous further development, it is proposed that the first pivoting element and the second pivoting element roll against each other in a connecting section, with the new material web and the outgoing material web being arranged one behind the other and each arranged between the first pivoting element and the second pivoting element. This enables advantageous guidance of the material webs between the pivoting elements. Furthermore, a contact pressure or a counter-bearing for the application of the at least one adhesive strip can be easily implemented.
[0012] According to an advantageous further development, it is further proposed that the second pivoting element be configured to deflect the unwinding material web without slippage. The movement of the second pivoting element is therefore preferably synchronized with the speed of the unwinding material web.
[0013] It is further proposed that the second pivoting element be configured to press the unwinding material web against the first pivoting element during deflection. This deflection can, for example, ensure that the unwinding material web rests firmly on the contact surface of the second pivoting element.
[0014] In an advantageous embodiment, the running-off material web can be clamped between the first pivoting element and the second pivoting element, while the running-off material web can be conveyed further in a conveying direction.
[0015] The clamping mechanism prevents any relative movement of the material webs to the two pivoting elements, while the pivoting elements roll against each other at the conveying speed of the material web. This is advantageous for the application of the adhesive strip(s) between the beginning of the new material web and the end of the outgoing material web, since, despite the continued conveyance of the material webs, there is no relative movement between the pivoting elements, which pivot in synchronization with the material webs, and the material webs.
[0016] In an advantageous embodiment, the second pivoting element is a counter-holder for the running material web when it is cut or weakened by the cutting device.
[0017] The second pivoting element can thus shift the running material web towards the cutting device and can simultaneously be used as a counter-holder for cutting off the rest of the running material web.
[0018] According to a further development, it is proposed that the cutting device is a knife roller which runs synchronously on the second pivoting element during cutting or weakening, wherein the running-off material web runs between the second pivoting element and the cutting device.
[0019] As a result, the rotatable knife roller can be arranged stationary in the device, while the running material web is shifted by the second pivoting element towards the knife roller.
[0020] The second pivoting element preferably serves as a counterbearing for the knife roller. This is facilitated by the slip-free deflection of the unwinding material web during conveyance by the second pivoting element, which pivots synchronously with the knife roller.
[0021] It is further proposed that the running-off material web runs off a reel which is arranged on a reel carrier, wherein the device is designed to slow down the reel in relation to the conveying speed after the running-off material web has been weakened at the dividing line.
[0022] The weakening of the unwinding material web can, for example, be a perforation at the dividing line. This allows the unwinding material web to be brought to a stop at the created dividing line at a later time after the weakening at the dividing line has been created by increasing the tensile stress in the unwinding material web. The increase in tensile stress can be achieved in particular by slowing down the reel with the unwinding material web relative to the conveying speed. Separation at the dividing line by slowing down the reel is particularly advantageous when the unwinding material web is clamped between the two pivoting elements, which preferably pivot at the conveying speed and roll against each other. Separation preferably occurs before the dividing line comes into contact with one of the two pivoting elements.
[0023] In a further advantageous embodiment, a reel opener is arranged on the first pivoting element, which is designed to open a reel with a new material web and to pick up the leader of the new material web from the reel.
[0024] The preparation for the dynamic joining of the material webs can therefore be carried out automatically, whereby a fully automatic joining process of two material webs can be achieved.
[0025] It is also proposed that a pre-tensioning element be provided for rolling up and tensioning the leader of the new material web. The pre-tensioning element can be used to wind up the leader of the new material web, for example, with a wrapping paper or a first layer, and remove it accordingly. Furthermore, the pre-tensioning element can be used to wind up the remaining portion of the new material web after it has been separated by the cutting unit at the separation line and also to dispose of it. Furthermore, the pre-tensioning element can preferably take over the new material web from the reel opener of the first pivoting element.
[0026] According to a further development, it is proposed that the device comprises a cutting unit and a counter element, wherein the cutting unit and the counter element are configured to cut the new material web to produce the web start of the new material web.
[0027] In this way, the new material web can be cut at the first pivoting element while the new material web rests against the first pivoting element. The cutting element and the counter-element are preferably mounted independently of the first pivoting element so that they cannot pivot with the pivoting element. The first pivoting element can therefore be constructed more simply, which reduces the moving mass. The cutting element and the counter-element are preferably movable into the plane of the material webs, for example from a rear wall of the device. The first pivoting element is preferably pivotable with the new material web to the position of the cutting element and the counter-element so that the cutting element and the counter-element can sever the new material web or sufficiently weaken it.Preferably, the cutting unit is arranged in a recess in a contact surface for the material webs of the first pivoting element.
[0028] The recess in the contact surface for the material web is accordingly at least partially covered by an adjacent material web. The contact surface for the material webs of the first pivoting element preferably corresponds to the contact surface of the second pivoting element, so that the first and second pivoting elements can roll against each other with their contact surfaces, whereby a material web can be arranged in the intermediate space.
[0029] In advantageous embodiments, the cutting unit can be moved, in particular, into the recess of the first pivoting element from a plane outside the path of the material webs. Furthermore, when cutting the new material web, the cutting unit preferably moves radially outward perpendicular to the pivot axis of the first pivoting element. The counter element is preferably stationary during the cutting process and rests on the side of the new material web facing away from the first pivoting element.
[0030] The web beginning therefore preferably rests against the counter element after the cutting process and further preferably covers at least part of the recess. In an advantageous embodiment, the new material web can also be fixed between parts of the contact surface of the first pivoting element and parts of the counter element. Furthermore, it is proposed that an applicator for adhesive strips be arranged on the first pivoting element, which is radially displaceable perpendicular to the pivot axis of the first pivoting element.
[0031] The applicator is preferably arranged on the first pivoting element. Furthermore, the applicator is preferably arranged in a recess in the contact surface for the material webs in the first pivoting element. This allows a portion of an adhesive strip to be applied to the beginning of the new material web created by the cutting. The counter element can also be used as an abutment for applying the adhesive strip. After the cutting process, the cutting unit is preferably moved out of the plane in which the material webs are conveyed.
[0032] According to a further development, it is proposed that the applicator be arranged in a recess in a contact surface for the material webs of the first pivoting element. The applicator can thus apply the adhesive strip to the beginning of the new material web from one side. In a preferred embodiment, the applicator and the cutting unit are located in the same recess, with only the applicator being connected to the pivoting element, and the cutting unit being movable into the recess.
[0033] It is further proposed that a supply unit for supplying adhesive strips be provided, which is configured to transfer adhesive strips to the applicator. The adhesive strips can be transferred, in particular, in a transfer position of the first pivoting element to the applicator, which is arranged on the first pivoting arm. The transfer of at least one adhesive strip from the supply unit can take place automatically, whereby the preparatory measures for dynamically joining the material webs can also be automated.
[0034] Furthermore, to achieve the object, a method for joining material webs for the production of energy cells with a device according to one of claims 1 to 16 is proposed.
[0035] The invention will be explained below using preferred embodiments with reference to the attached figures.
[0036] Fig. 1 shows a device for connecting material webs with a first pivoting element in a take-over position for adhesive strips;
[0037] Fig. 2 shows a device for joining material webs with an applicator in the first pivoting element when taking over an adhesive strip;
[0038] Fig. 3 shows a device for connecting material webs with an applicator with an adhesive strip taken from a supply unit;
[0039] Fig. 4 shows a device for connecting material webs with a reel to a new material web when the reel is opened by the first pivoting element; Fig. 5 shows a device for connecting material webs when the new material web is transferred to a pre-tensioning element;
[0040] Fig. 6 shows a section with a first pivoting element with a cutting unit and a counter element;
[0041] Fig. 7 shows a section with a first pivoting element during the application of an adhesive strip to the beginning of the new material web;
[0042] Fig. 8 shows a device for connecting material webs with a pivoting element with the new material web in a waiting position;
[0043] Fig. 9 shows a device for connecting material webs with a pivoting element in a waiting position and a knife drum from the rear wall;
[0044] Fig. 10 shows a device for connecting material webs with accelerated pivoting elements;
[0045] Fig. 11 shows a device for joining material webs when producing an adhesive bond;
[0046] Fig. 12 shows a device for joining material webs to a joined material web;
[0047] Fig. 13 shows a material web connected with an adhesive strip from a back side; and Fig. 14 shows a material web connected with an adhesive strip from a front side.
[0048] Figures 1 to 12 illustrate an advantageous embodiment of a device 10 for joining material webs 11, 12 for the production of energy cells. The material webs 11, 12 are, for example, conductor foils coated with anode or cathode material.
[0049] Figure 1 shows the conveyance of the unwinding material web 11 from a reel 20 mounted on a reel carrier 22. The material web 11 is conveyed at a conveying speed to a downstream process for the production of an energy or battery cell. For the continuous conveyance of an endless material web 11, 12 to downstream processes, the material web 11 from the reel 20 is joined to a new material web 12 before the end of the reel 20. The joining of the material webs 11, 12 preferably takes place at full conveying speed, so that no buffer storage is required for the unwinding material web 11, or in alternative embodiments, only a small buffer storage is required.
[0050] The device 10 has a first pivoting element 13 and a second pivoting element 14, each of which is rotatable independently of one another about a pivot axis 33, 34 by means of servomotors. In the state shown in Figure 1, the first pivoting element 13 is in a takeover position in which the first pivoting element 13 faces a supply unit 32 for adhesive strips 19. The first pivoting 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 is movable in the radial direction in the first pivoting element 13. In Figure 1, the applicator 30 is in a retracted position.
[0051] The second pivoting element 14 also has a curved contact surface 35 for the material webs 11, 12 and, in the illustration in Figure 1, is in a position in which the second pivoting element 14 has no contact with the running material web 11.
[0052] In Figure 2, the applicator 30 for receiving an adhesive strip 19 is moved radially out from the supply unit 32 into a receiving position, so that the adhesive strip 19 can be received by the applicator 30 preferably outside the recess 31.
[0053] In Figure 3, the adhesive strip 19 has been taken over by the applicator 30 and is held in place, for example, by means of negative pressure. The applicator 30 with the adhesive strip 19 has been retracted into a waiting position in the recess 31 in the direction of the pivot axis 34. The adhesive strip 19 is thus prepared for joining the material webs 11, 12.
[0054] Figure 4 shows a new reel 21 with the new material web 12 on the reel holder 23, which is arranged together with the reel holder 22 with the unwinding material web 11 on a turntable 24.
[0055] The first pivoting element 13 has a reel opener 25, with which the reel 21 is opened and gripped. The reel opener 25 is arranged at the front part of the contact surface 36 or in the conveying direction of the intended pivoting movement, so that a gripped material web 12 is guided by the reel 21 over the curved contact surface 36 during a pivoting movement of the first pivoting element 13, as can be seen in Figure 5.
[0056] Furthermore, Figure 5 shows how the new material web 12 is transferred to a pre-tensioning element 26. The pre-tensioning element 26 can wind up the leader 27 of the new material web 12 and, for example, discard wrapping paper or a first layer.
[0057] Figure 6 shows a section of the cutting process for the new material web 12 to produce a defined web beginning 16 of the new material web 12. A cutting unit 28 and a counter element 29 are moved from a 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 inserted into the recess 31, while the applicator 30 with the adhesive strip 19 remains in the waiting position. The counter element 29 rests on the side of the material web 12 facing away from the recess 31.
[0058] The cutting unit 28 is then moved toward the counter element 29, and the leader 27 of the new material web 12 is severed at the counter element 29. The severed leader 27 is wound up by the leader element 26 and then disposed of.
[0059] In a next step, which is shown in Figure 7, the applicator 30 applies the adhesive strip 19 to the web beginning 16 of the new material web 12, whereby the new material web 12 only partially covers the adhesive strip 19. The counter element 29 serves as an abutment during the application of the adhesive strip 19. Furthermore, after the new material web 12 has been separated, the counter element 29 briefly serves as a fixing aid for the newly created web beginning 16. The adhesive strip 19 and thus, in principle, also the web beginning 16 of the new material web 12 can be held on the applicator 30, for example, by vacuum.
[0060] In Figure 8, the first pivoting element 13 is rotated into a standby position. The material web 12 has been rewound onto the reel 21 as necessary. The preparations for the new material web 12 to be connected to the outgoing material web 11 are therefore complete.
[0061] Furthermore, as shown in Figure 9, a knife roller 17 is retracted from a rear plane, with the unwinding material web 11 running between the knife roller 17 and the second pivoting element 14. The preparations of the device 10 for joining the new material web 12 to the unwinding material web 11 are thus complete. The splice can now be initiated according to the unwinding state of the reel 20 and the remaining web length of the unwinding material web 11.
[0062] In this advantageous embodiment, the running material web 12 can be further fed from the reel 20 to a subsequent process for producing battery cells during these preparations.
[0063] Figures 10 and 11 show the actual joining process of the unwinding material web 11 to the new material web 12 by the device 10. In Figure 10, the first and second pivoting elements 13, 14 accelerate, with the first pivoting element 13 also accelerating the web beginning 16 with the adhesive strip 19 to the conveying speed. The second pivoting element 14 also accelerates and deflects the unwinding material web 11, which continues to be conveyed at conveying speed, toward the driven knife roller 17. The knife roller 17 cuts the deflected, unwinding material web 11 at a severing line 18, forming a web end 15 of the unwinding material web 11. The second pivoting element 14, which pivots at a speed synchronized with the unwinding material web 11, serves as a counterbearing for the knife roller 17.At the moment of cutting or weakening at the cutting line 18, the knife roller 17 and the two pivoting elements 13, 14 have a synchronous speed, e.g., the process speed or the conveying speed of the advancing material web 11. In possible embodiments, the reel holder 22 can decelerate the reel 22 after cutting or weakening at the cutting line 18 by the knife roller 17, so that the advancing material web 11 is cut when weakened at the cutting line 18.
[0064] Furthermore, in this advantageous embodiment, the unwinding material web 11 is clamped between the first and second pivoting elements 13, 14, whereby the unwinding material web 11 continues to be conveyed at the conveying speed. The contact surfaces 35, 36 roll against one another with the unwinding material web 11 therebetween during the synchronized pivoting movement of the first and second pivoting elements 13, 14. Figure 11 shows the device 10 a moment later. The first and second pivoting elements 13, 14 are pivoted further in the conveying direction of the unwinding material web 11. The web end 15 of the unwinding material web 11, created by the measuring roller 17, comes against the free area of the adhesive strip 19, which is glued with its further part to the web beginning 16 of the new material web 12.The adhesive strip 19 is supported by the applicator 30, which creates a contact pressure on the adhesive strip 19 against the web end 16 of the unwinding material web 11 together with the contact surface 35 of the second pivoting element 14. The web end 15 of the unwinding material web 11 can therefore be connected to the web beginning 16 of the new material web 12 without overlap.
[0065] The material web 11, 12 connected in this way with the adhesive strip 19 then runs off the reel 21, whereby the connecting process and the changeover to the new material web 12 is completed with continuous conveyance of the material web 11, 12, as shown in Figure 12. The reel 21 with the new material web 12 can then rotate with the turntable 24 to the position of the reel 22, whereby the new material web 12 finally becomes the running-off material web 11 and conveyance of an endless material web 11, 12 is possible. The butt splice of the material webs 11, 12 can therefore be produced at process speed, so that the speed of a subsequent process in the production of energy cells, in particular battery cells, does not have to be reduced for the connecting process.
[0066] Figure 13 shows the material webs 11, 12 connected with the adhesive strip 19, schematically from the rear. Figure 14 shows the same connection in a front view. It is particularly evident that the end 15 of the unwinding material web 11 and the beginning 16 of the new material web 12 do not overlap.
[0067] List of reference symbols
[0068] 10 Device
[0069] 11 outgoing material web
[0070] 12 new material webs
[0071] 13 first swivel element
[0072] 14 second swivel element
[0073] 15 End of track
[0074] 16 Start of track
[0075] 17 Cutting device
[0076] 18 dividing line
[0077] 19 adhesive strips
[0078] 20 running bobbins
[0079] 21 new reels
[0080] 22 bobbin carriers
[0081] 23 bobbin carriers
[0082] 24 turntables
[0083] 25 bobbin openers
[0084] 26 Preload element
[0085] 27 Opening credits
[0086] 28 Cutting unit
[0087] 29 Counter element
[0088] 30 applicator
[0089] 31 recess
[0090] 32 Provisioning Unit
[0091] 33 Swivel axis
[0092] 34 Swivel axis
[0093] 35 contact surface
[0094] 36 contact surface
Claims
Claims:
1. Device (10) for connecting material webs (11, 12) for the production of energy cells, in particular electrode webs, wherein a running material web (11) can be connected to a new material web (12), characterized in that - a first pivoting element (13) for the new material web (12) and a second pivoting element (14) for the running-off material web (11) are provided, wherein - the first pivoting element (13) is designed to hold the web start (16) of the new material web (12), - the second pivoting element (14) is designed to deflect the running material web (11) in the direction of the first pivoting element (13), and - a cutting device (17) is provided which is designed to separate or weaken the running material web (11) deflected by the second pivoting element (14) at a separating line (18) to produce a web end (15) of the running material web (11), wherein - the device (10) is designed to - to accelerate the web start (16) of the new material web (12) with the first pivoting element (13) and to synchronise it with the running material web (11) at the speed at which the web end (15) of the running material web (11), which is deflected by the second pivoting element (14), is conveyed, whereby - the web start (16) of the new material web (12) can be connected to the web end (15) of the running-off material web (11) between the first and second pivoting elements (13, 14) by at least one adhesive strip (19). Device (10) according to claim 1, characterized in that - the web beginning (16) of the new material web (12) and the web end (15) of the running material web (11) can be connected one behind the other between the first and second pivoting elements (13, 14). Device (10) according to claim 1 or 2, characterized in that - the first pivoting element (13) and the second pivoting element (14) roll against each other in a connecting section, wherein the new material web (12) and the running-off material web (11) are arranged one behind the other and are each arranged between the first pivoting element (13) and the second pivoting element (14). Device (10) according to one of the preceding claims, characterized in that the second pivoting element (13) is designed to deflect the running material web (11) without slippage. Device (10) according to one of the preceding claims, characterized in that the second pivoting element (14) is designed to press the running material web (11) against the first pivoting element (13) during deflection. Device (10) according to one of the preceding claims, characterized in that the running material web (11) can be clamped between the first pivoting element (13) and the second pivoting element (14), while the running The advancing material web (11) can be conveyed further in a conveying direction. Device (10) according to one of the preceding claims, characterized in that the second pivoting element (14) acts as a counter-holder for the advancing material web (11) during cutting or weakening by the cutting device (17). Device (10) according to claim 7, characterized in that the cutting device (17) is a knife roller (17) which runs synchronously on the second pivoting element (14) during cutting or weakening, the advancing material web (11) running between the second pivoting element (14) and the cutting device (17).Device (10) according to one of the preceding claims, characterized in that the unwinding material web (11) unwinds from a reel (20) arranged on a reel support (22), wherein the device (10) is configured to slow down the reel (20) in relation to the conveying speed after the unwinding material web (11) has been weakened at the severing line (18). Device (10) according to one of the preceding claims, characterized in that a reel opener (25) is arranged on the first pivoting element (13), which is configured to open a reel (21) with a new material web (12) and to pick up the leader (27) of the new material web (12) from the reel (21). Device (10) according to one of the preceding claims, characterized in that a pre-tensioning element (26) is provided for rolling up and tensioning the leader (27) of the new material web (12). Device (10) according to one of the preceding claims, characterized in that the device (10) has a cutting unit (28) and a counter-element (29), wherein the cutting unit (28) and the counter-element (29) are configured to cut the new material web (12) to produce the web beginning (16) of the new material web (12). Device (10) according to claim 12, characterized in that the cutting unit (28) is arranged in a recess (31) in a contact surface for the material webs (11, 12) of the first pivoting element (13). Device (10) according to one of the preceding claims, characterized in that - an applicator (30) for adhesive strips (19) is arranged on the first pivoting element (13), which applicator is radially displaceable perpendicular to the pivot axis (34) of the first pivoting element (13). Device (10) according to claim 14, characterized in that the applicator (30) is arranged in a recess (31) in a contact surface for the material webs (11, 12) of the first pivoting element (13). Device (10) according to claim 14 or 15, characterized in that a supply unit (32) for supplying adhesive strips (19) is provided, which is configured to transfer adhesive strips (19) to the applicator (30). A method for joining material webs (11, 12) for the production of energy cells, characterized in that the method is carried out using the device according to one of the preceding claims.