Device and method for connecting material webs for the production of energy cells
Patent Information
- Application Number
- EP2023773266
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-04
- Filing Date
- 2023-09-19
- Publication Date
- 2025-08-13
AI Technical Summary
The increasing production speeds in energy cell manufacturing, such as Li-ion batteries, cannot be adequately compensated for by larger buffer storage, necessitating a dynamic and efficient method to connect material webs without the use of buffer storage to reduce space requirements and costs.
A device with pivotable or rotatable pressure elements that connect material webs by generating weakening lines through increased tensile stress, allowing for a dynamic splice with an overlap, either through embossing or adhesive connections, enabling continuous production without a buffer storage system.
This solution allows for a quick and efficient connection of material webs, reducing the need for buffer storage, minimizing space requirements, and achieving high connection strength while maintaining continuous production speeds, particularly suitable for separator films in energy cells.
Smart Images
Figure 1.1
Abstract
Description
[0001] Device and method for joining material webs for the production of energy cells
[0002] The present invention relates to a device for joining material webs, in particular separator films, for the production of energy cells according to the preamble of claim 1 and a corresponding method according to the preamble of claim 14.
[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 long 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 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 joining material webs, in particular separator films, for the production of energy cells is proposed, wherein an outgoing material web can be joined to a new material web. The outgoing material web and the new material web can be guided at a distance from one another in a connecting section, preferably one above the other at a distance from one another. Two pivotable or rotatable pressure elements with pressure surfaces are provided, which are designed to press the outgoing and the new material web against one another in the connecting section and to join the outgoing material web and the new material web together.The pressure elements are designed to connect the material webs during the movement in the conveying direction of the outgoing and the new material web, and the device is designed to produce a weakening line, preferably a perforation line, in each of the outgoing and the new material webs and to separate the material webs by applying an increased tensile stress in the material webs at the weakening lines, preferably the perforation lines.
[0008] The material webs are spaced apart from one another before being joined. The new and the outgoing material webs are preferably guided in parallel. Furthermore, the respective edges of the new and the outgoing material webs preferably lie in a plane perpendicular to a plane of the surface of at least one of the material webs in the joining section. Furthermore, the material webs preferably lie one above the other with their planes or their base surfaces, wherein the material webs are guided at a distance from one another. In this context, “one above the other” refers to the alignment of the material webs to one another in a joining section of the device. In the joining section, the material webs are guided before, during and / or after the joining. In the joining section, the material webs are preferably each guided over two rollers.
[0009] The device is preferably designed to convey the new and the outgoing material webs at the same conveying speed at least immediately before and / or during the joining of the material webs by pressing them against one another using the pressure elements, so that there is no relative speed of the material webs to the process speed for the subsequent processes during the joining process. The joining takes place in an overlapping area of the two material webs, which is acted upon by the pressure elements, so that a splice with an overlap is formed. The pressure elements preferably displace the new and the outgoing material webs towards one another so that the distance between the material webs is eliminated and the material webs are pressed onto or against one another.When shifting the path of at least one material web and pressing both material webs together, the rotatable pressure elements preferably also have a speed that is adapted and synchronized to the speed of the new and the outgoing material web. This allows a dynamic connection or splice of the new material web with the outgoing material web to be created with an overlap during ongoing conveying.
[0010] At the moment of pressing against one another or joining, the pressure elements preferably have the process speed or conveying speed of the material webs, in particular the unwinding material web on the side in the conveying direction. Preferably, no slippage occurs between the pressure surfaces and the material webs. The pressure elements are preferably arranged on both sides of the material webs in the joining section.
[0011] The device is preferably configured to create the weakening lines in the material webs prior to pressing the material webs together for joining. Furthermore, the device can preferably be configured to create the weakening line during the pressing of the material webs together, in particular by the pressure elements themselves.
[0012] The weakening line in the outgoing material web is behind the connection or the subsequent connection of the material webs, opposite to the conveying direction, and the weakening line in the new material web is in front of the connection or the subsequent connection of the material webs, in the conveying direction.
[0013] The proposed device is particularly suitable for separator tracks or separator foils of an energy cell, in particular a battery cell, since the separator foils are comparatively thin and the absolute increase in the overlap area of the connection is small, for example, compared to coated electrode tracks.
[0014] According to a further development, it is proposed that the pressure surfaces of the pressure elements be embossed surfaces, and that the pressure elements are configured to create an embossed connection when the unwinding and the new material webs are pressed against each other. The embossed connection enables the material webs to be connected without additional joining elements and also without temperature changes. An embossed connection is particularly suitable for separator films of an energy cell, in particular a battery cell, since the separator films are generally homogeneous material webs compared to coated electrode webs. The embossed surfaces of the pressure elements have a corresponding surface design for this purpose; in particular, the embossed surfaces of the pressure elements preferably have embossed surfaces that correspond to one another. In possible embodiments, the pressure elements can also be referred to as embossed elements.
[0015] In advantageous embodiments, the pressure elements, for example with the embossed surfaces, are designed to produce a weakening line in the new and in the running-off material web.
[0016] In possible embodiments, a line of weakness may also be present at the transition of an embossed connecting section to an unembossed section of a material web.
[0017] In an alternative embodiment, it is proposed that the device comprises an adhesive sheet holder which is designed to hold a double-sided adhesive sheet between the running-off and the new material web, wherein the pressure elements are designed to produce an adhesive bond between the material webs together with the adhesive sheet when the running-off and the new material web are pressed against one another.
[0018] This also allows for a dynamic connection or splice between the new material web and the outgoing material web. The adhesive bond can be achieved with high bond strength using pressure elements that first shift the two material webs toward the adhesive sheet and then press the material webs onto the adhesive sheet from both sides.
[0019] In possible further embodiments, a sealed connection of the material webs can also be created with the proposed device by a combination of an adhesive connection and an embossed connection.
[0020] It is further proposed that the device is designed to increase the tensile stress in the new material web and / or in the running-off material web during the production of the embossed connection and / or the adhesive connection in order to separate the material web by means of the respectively increased tensile stress.
[0021] This enables targeted separation at the weakening line or perforation line, which can also be achieved over time by controlling the tensile stress when the material webs are pressed against each other. The temporary increase in tensile stress causes the respective material web to tear at the weakening line. The tearing of the material web preferably occurs when the webs are pressed against each other, which fixes the material web relatively at the current conveying speed, so that a particularly targeted build-up of tensile stress can occur in a section with the weakening line. In the conveying direction from the connection point, for example, the conveying speed of the new material web can be increased in order to increase the tensile stress. Against the conveying direction from the connection point, the conveying speed of the outgoing material web can be reduced in order to increase the tensile stress.
[0022] According to a further development, it is proposed that the device is designed to build up an increased tensile stress in the running-off material web between the weakening line and a reel with the running-off material web in order to separate the running-off material web, and to build up an increased tensile stress in the new material web between the weakening line and a pre-tension winder with the new material web in order to separate the new material web.
[0023] For example, the reel with the unwinding material web can run at a lower peripheral speed than the process speed at the moment of pressing or joining by the pressure elements, thereby severing the remaining part of the unwinding material web or the trailer. The leader winder can be operated at a higher speed than the process speed or the conveying speed of the unwinding material web in the conveying direction of the splice at the moment of pressing or joining, in order to achieve a corresponding increase in tensile stress and separation at the weakening line.
[0024] It is further proposed that the pressure elements each have a curved, in particular simply curved, preferably circular-arc-shaped, pressure surface and / or embossing surface, which runs along one of the material webs during pressing and / or embossing. This enables slip-free contact between the pressure element and the material web with a uniform movement, which simplifies the control or regulation of the movement of the pressure elements and prevents unwanted stress peaks in the material webs.
[0025] According to a further development, it is proposed that a weakening device, preferably one weakening device in each case, is provided opposite to a conveying direction in front of the connecting section for the running-off material web and / or the new material web, which weakening device is designed to produce a weakening line in a material web.
[0026] The weakening device is preferably arranged between a reel of the running-off material web and a reel of the new material web and the connecting section.
[0027] The weakening device creates a weakening line, for example, a perforated and / or cut line and / or a pinched line in one or both material webs. The creation of the weakening line in the new material web is preferably synchronized by the weakening device with the movement of the pressure elements in such a way that the weakening line of the new material web lies behind the pressure elements due to the continuous conveyance when the material webs are pressed against each other, so that the leader of the new material web can be severed.In the unwinding material web, the generation of the weakening line is preferably synchronized in time by the weakening device with the movement of the pressure elements in such a way that the weakening line of the unwinding material web lies in front of the pressure elements due to the continuous conveyance when the material webs are pressed against each other, so that the remaining part of the unwinding material web can be separated.
[0028] It is further proposed that the weakening device comprises a knife roller and a counter roller, wherein the counter roller is pivotable and designed to come into contact with a material web when pivoting, to displace the material web and to press it against a knife roller.
[0029] This allows the weakening line to be created as a predetermined breaking point in the material webs while the material web is moving at the conveying speed. The counter roller shifts the path of the material web toward the knife roller, with the counter roller preferably rolling passively on the material web. The counter roller serves as a counter-holder for the knife roller, which preferably rolls actively on the material web and uses a knife to create a weakening and / or perforation along a weakening line.
[0030] In an advantageous embodiment, the pressure elements are designed to produce a weakening line in the outgoing and in the new material web.
[0031] The weakening line can be created by the pressure elements, in particular by embossing or during the production of an embossed joint, for example, at the transition from an embossed to an unembossed section. Furthermore, a knife or edge can be provided on the pressure elements, which creates a weakening of the material along a weakening line in the respective material web. In this possible embodiment, for example, an additional weakening device can be dispensed with.
[0032] It is further proposed that the device is designed to produce a weakening line in the new material web in the conveying direction in relation to the connection, for example the embossed connection and / or adhesive connection, and / or to produce a weakening line in the running material web opposite to the conveying direction in relation to the embossed connection or adhesive connection.
[0033] According to an advantageous further development, it is proposed that a pivoting element is provided which is designed to grip the new material web from a new reel, guide it through the connecting section and transfer it to a pre-tension winder.
[0034] This enables a fully automated joining process for two material webs. Furthermore, the pre-winder can accelerate the new material web to process speed, allowing the two material webs to be joined dynamically at a synchronized process speed.
[0035] In a further development, it is proposed that the device has a feeding device which has two reel holders for reels of the material webs.
[0036] The reel holders for the outgoing and new material webs are preferably actively driven. The material webs are conveyed through the connecting section by the feed device.
[0037] In a preferred embodiment, the feed device has a turntable on which the reel holders are arranged.
[0038] The turntable allows the new bobbin holder with the bobbin of the new material web to rotate to the position of the bobbin of the outgoing material web after the material webs have been connected.
[0039] Furthermore, to achieve the object, a method for joining material webs for the energy cell producing industry with a device according to one of claims 1 to 13 is proposed.
[0040] According to a further development, it is proposed that the device has a pre-tension winder with a diameter, wherein a part of the new material web is wound from a reel on a reel holder onto the pre-tension winder, wherein the revolutions of the pre-tension winder and the reel holder are detected, and the diameter and / or the circumference of the reel is calculated from the detected revolutions and from the diameter of the pre-tension winder.
[0041] The proposed diameter calculation can be used advantageously to adjust the conveying speed and / or the time for the next reel change or for the connection to the next material web. The invention is explained below using preferred embodiments with reference to the attached figures.
[0042] Fig. 1 shows a device for connecting material webs with a running material web;
[0043] Fig. 2 shows a device for connecting material webs with a new material web on a reel;
[0044] Fig. 3 shows a device for joining material webs when opening the new reel;
[0045] Fig. 4 shows a device for connecting material webs with a threaded new material web;
[0046] Fig. 5 shows a device for connecting material webs with the new material web on a pre-tension winder;
[0047] Fig. 6 a device for connecting material webs with pivoted counter rollers;
[0048] Fig. 7 shows a device for joining material webs while creating weakening lines in the material webs;
[0049] Fig. 8 shows a device for joining material webs with pressure elements when producing an embossed connection; Fig. 9 shows a device for joining material webs with pressure elements when separating the material webs;
[0050] Fig. 10 shows a device for connecting material webs with a material web connected by an embossed connection;
[0051] Fig. 11 shows another device for connecting material webs with an adhesive sheet holder;
[0052] Fig. 12 shows a device for connecting material webs with pressure elements when producing an adhesive connection;
[0053] Fig. 13 shows a device for joining material webs with an adhesive connection when separating the material webs;
[0054] Fig. 14 shows a device for connecting material webs with a material web connected by an adhesive bond;
[0055] Fig. 15 shows a further embodiment of a device for joining material webs without knife rollers;
[0056] Fig. 16 shows a device for joining material webs when creating an embossed connection and a weakening line; Fig. 17 shows a device for joining material webs when separating the material webs;
[0057] Fig. 18 shows a device for joining material webs without knife rollers to a joined material web;
[0058] Fig. 19 a material web connected by an embossed connection; and
[0059] Fig. 20 a material web connected by an adhesive bond.
[0060] Figure 1 schematically illustrates an advantageous embodiment of a device 10 for joining an outgoing material web 11 to a new material web 12, which may be separator webs for the production of battery cells, for example. The outgoing material web 11 runs from a reel 25 onto a reel holder 34. The outgoing material web 11 is guided on two rollers 37 through a connecting section 13, and a subsequent process is supplied with the outgoing material web 11 at process speed.
[0061] For a continuous conveyance of a material web 11, 12 to subsequent processes for producing an energy cell, in particular a battery cell, the outgoing material web 11 is connected to a new material web 12 with a dynamic splice in the device 10.
[0062] Figure 2 shows the device 10 with a new reel 26 containing the new material web 12, which is arranged on a reel holder 35. In this advantageous embodiment, both reels 25, 26 are arranged with the reel holders 34, 35 on a turntable 36, forming a feed device 33.
[0063] Figure 3 shows a further step in preparing the connection of the unwinding material web 11 with the new material web 12, in which a pivoting element 32 has a reel opener with which the reel 26 is opened and the beginning of the material web 12 is gripped. The new material web 12 is then threaded through the connecting section 13, in which the new material web 12 is guided parallel to the unwinding material web 11 over two rollers 37, as shown in Figure 4. The new material web 12 and the unwinding material web 11 are therefore guided one above the other with their base surfaces aligned to one another in the connecting section 13. In this state, the material webs 11, 12 have a distance from one another which is defined by the guidance with the rollers 37.During this time, the outgoing material web 11 can be conveyed at the process speed, whereas the new material web 12 remains stationary or is moved at a comparatively low speed for threading into the connecting section 13.
[0064] In Figure 5, the pivoting element 32 has transferred the new material web 12 to a pre-tension winder 27. The pre-tension winder 27 rotates until the new material web 12 is securely wrapped around the pre-tension winder 27. Any packaging material as well as the leader of the new material web 12 can then be wound up by the pre-tension winder 27. The preparations for the actual joining process are now complete. In this advantageous embodiment, the device 10 has two weakening devices 28, 29, each of which creates a weakening line 19, 20 or a predetermined breaking line or point in the material webs 11, 12. For this purpose, the weakening device 28, 29 has two pivotable counter-rollers 31, which are pivoted to engage each of the material webs 11, 12, as can be seen in Figure 6.As a result, the material webs 11, 12 are each displaced such that they each come into contact with a knife roller 30. The weakening devices 28, 29 can, for example, be moved out from the rear wall of the device 10.
[0065] Figures 7 to 10 show the joining process with the device 10 in a preferred embodiment. The pre-tension winder 27 accelerates the new material web 12. The weakening device 28 creates a perforation along a weakening line 19 with the knife roller 30, as shown in Figure 7. Figure 8 shows a somewhat later point in time, at which the weakening line 19 has already been conveyed past the pressure elements 15, 17 in the joining section 13. The pre-tensioning unit 27 preferably accelerates the speed to slightly more than the process speed to enable separation along the weakening line 19 through increased tensile stress in the new material web 12.
[0066] The further weakening device 29 for the advancing material web 11, as shown in Figure 8, has also created a weakening line 20 by means of the knife roller 30, which has already been conveyed at the process speed into the connecting section 13 between the rollers 37. The pressure elements 15, 17 rotate and accelerate to a speed coordinated with the process speed and press the two material webs 11, 12 against each other in the connecting section 13. The pressure surfaces of the pressure elements 15, 17, which are in contact with the material webs 11, 12, in this advantageous embodiment have embossed surfaces which, at the time shown in Figure 8, create an embossed connection 21 between the two material webs 11, 12 pressed against each other (see also Figure 19).
[0067] At this moment, the pre-tension winder 27 is running at a higher speed than the process speed, increasing the tensile stress in the new material web 11 between the pre-tension winder 27 and the embossed connection 21, which is fixed between the pressure elements 15, 17 at this time at process speed. This leads to the separation of the new material web 12 at the weakening line 19 prepared for this purpose. The leader of the new material web 12 is thus severed before the connection point to the unwinding material web 11.
[0068] At this point, the reel 25 of the unwinding material web 11 on the reel holder 34 is decelerated, so that the unwinding material web 11 is conveyed at less than the process speed. As a result, the tensile stress in the unwinding material web 11 between the reel 25 and the embossed joint 21, which is fixed between the pressure elements 15, 17 at this point in time at process speed, is increased to such an extent that the unwinding material web 11 tears at the weakening line 20. The remainder of the unwinding material web 11 can then be wound up. This state of the device 10 for joining material webs 11, 12 is shown in Figure 9.
[0069] Figure 10 shows how the material web 11, 12 connected by the embossed connection 21 is conveyed by the new reel 26 onto the reel holder 35. The unwinding reel 25 with the remainder of the material web 11 can be removed, and the new reel 26 with the new material web 12 can then rotate with the turntable 36, on which reel holders 34, 35 are arranged, to the position of the unwinding reel 25. The new reel 26 with the new material web 12 can thus, after the connection, assume the position of the unwinding reel 25 with the unwinding web 11. In this way, it is possible to provide an endless material web 11, 12, in particular a separator web, for the production of battery cells using the device 10 without interrupting the conveying process and, furthermore, preferably without the use of a process buffer for the material web 11, 12.
[0070] Figures 11 to 14 show a further advantageous embodiment which follows the preparatory steps illustrated in Figures 1 to 6.
[0071] As shown in Figure 11, the device 10 has an adhesive sheet holder 22, which is configured to place a double-sided adhesive sheet 23 in the connecting section 13. The adhesive sheet holder 22 is arranged in the connecting section 13 between the rollers 37, on which the material webs 11, 12 are guided at a distance from one another.
[0072] In the illustration of Figure 12, the pre-tension winder 27 accelerates the new material web 12. The weakening device 28 creates a perforation with the knife roller 30 on a weakening line 19, which has already moved past the pressure elements 15, 17 in the connecting section 13 when the material webs 11, 12 are pressed against one another.
[0073] The weakening line 20, which was created by the weakening device 29 with the knife roller 30 and the counter roller 31 in the running material web 11, is located in the illustration in Figure 12 between the connecting section 13 and the weakening device 28.
[0074] The pressure elements 15, 17 rotate and accelerate to a speed coordinated with the process speed and press the two material webs 11, 12 against each other in the connecting section 13, wherein the material webs 11, 12 are displaced relative to each other so that the adhesive sheet 23 is pressed against the material webs 11, 12 between the material webs 11, 12 pressed against each other and these are connected by an adhesive connection 24 via the adhesive sheet 23.
[0075] Figure 13 illustrates a state of the device 10 in which an increased speed compared to the process speed of the pre-tension winder 27 increases the tensile stress in the new material web 11 between the pre-tension winder 27 and the adhesive bond 24, which is currently being fixed between the pressure elements 15, 17 at process speed. The increased tensile stress in the new material web 12 leads to a separation at the weakening line 19.
[0076] The reel 25 with the unwinding material web 11 is decelerated to a speed below the process speed, which leads to an increase in the tensile stress in the unwinding material web 11 between the reel 25 and the adhesive bond 24, which is fixed between the pressure elements 15, 17 at this time at process speed. The unwinding material web 11 is accordingly severed at the weakening line 20.
[0077] Figure 14 shows the conveyance of the material web 11, 12 connected by the adhesive connection 24 from the new reel 26 onto the reel holder 35. The new reel 26 with the new material web 12 can then be rotated by the turntable 36 to the position of the unwinding reel 25. The new reel 26 with the new material web 12 can thus, after the connection, assume the position of the unwinding reel 25 with the unwinding web 11. With this advantageous embodiment of the device 10, it is possible to provide an endless material web 11, 12, in particular a separator web, for the production of battery cells without interrupting the conveyance and furthermore preferably without the use of a process buffer for the material web 11, 12.
[0078] Figures 15 to 18 show a further advantageous embodiment of a device 10 for joining material webs 11, 12, which, in contrast to the previous embodiments, does not have weakening devices 28, 29.
[0079] Figure 15 shows the device 10 for joining the material webs 11, 12, in which the new material web 12 has already been transferred to the pre-tension winder 27. The outgoing and the new material web 11, 12 are accordingly guided one above the other in the guide section 13 at a distance from each other. In Figure 16, the pressure elements 15, 17 arranged on both sides of the material webs 11, 12 rotate, as in the previous embodiments, so that they come into contact with the respective material web 11, 12. The pressure elements 15, 17 rotate at a speed matched to the process speed and press the two material webs 11, 12 against each other in the joining section 13. In this advantageous embodiment, the pressure surfaces of the pressure elements 15, 17, which are in contact with the material webs 11, 12, have embossed surfaces, whereby an embossed connection 21 is produced.
[0080] The embossing process introduces weakening lines 19, 20 into the material webs 11, 12. The weakening lines 19, 20 are preferably located at the transition from the embossed connection to the unaffected section of the material webs 11, 12.
[0081] Figure 17 illustrates the separation of the material webs 11, 12 during the joining process by the pressure elements 15, 17, which secure the conveyed material webs 11, 12 at this moment. The pre-tension winder 27 is operated at a higher speed than the process speed during the joining process, thereby increasing the tensile stress in the new material web 11 between the pre-tension winder 27 and the embossed joint 21, which is secured between the pressure elements 15, 17 at this time at process speed. This leads to the separation of the new material web 12 at the weakening line 19.
[0082] At this point, the reel 25 of the unwinding material web 11 on the reel holder 34 is decelerated, so that the unwinding material web 11 is conveyed at a speed below the process speed. This increases the tensile stress in the unwinding material web 11 between the reel 25 and the embossed connection 21, which is fixed between the pressure elements 15, 17 at this point in time at process speed, to such an extent that the unwinding material web 11 tears at the weakening line 20. The remainder of the unwinding material web 11 can then be wound up.
[0083] The material web 11, 12 connected with the embossed connection 21 is then conveyed by the new reel 26 on the reel holder 35, as shown in Figure 18.
[0084] The new reel 26 with the new material web 12 can then be rotated with the turntable 36 to the position of the unwinding reel 25. The new reel 26 with the new material web 12 can thus assume the position of the unwinding reel 25 with the unwinding web 11 after the connection.
[0085] Figure 19 shows a connection of a running material web 11 with a new material web 12 with an embossed connection 21 in a top view.
[0086] Figure 20 shows a connection of a running material web 11 with a new material web 12 with an adhesive connection 24.
[0087] List of reference symbols:
[0088] 10 Device
[0089] 11 outgoing material web
[0090] 12 new material webs
[0091] 13 connecting section
[0092] 14 Pressure element
[0093] 15 Pressure element
[0094] 16 Pressure surface
[0095] 17 Pressure surface
[0096] 18 Conveying direction
[0097] 19 Line of weakness
[0098] 20 Line of weakness
[0099] 21 Embossed connection
[0100] 22 adhesive sheet holders
[0101] 23 adhesive sheets
[0102] 24 Adhesive bond
[0103] 25 reels
[0104] 26 reels
[0105] 27 pre-tension winders
[0106] 28 Weakening device
[0107] 29 Weakening device
[0108] 30 knife roller
[0109] 31 Counter roll
[0110] 32 Swivel element
[0111] 33 Feeding device
[0112] 34 reel holder
[0113] 35 reel holder
[0114] 36 turntables
[0115] 37 roll
Claims
Claims:
1. Device (10) for joining material webs (11, 12), in particular separator films, for the production of energy cells, wherein a running-off material web (11) can be joined to a new material web (12), wherein - the running-off material web (11) and the new material web (12) can be guided in a connecting section (13) at a distance from each other, wherein - two pivotable or rotatable pressure elements (14, 15) with pressure surfaces (16, 17) are provided, which are designed to press the outgoing and the new material web (11, 12) against each other in the connecting section (13) and to connect the outgoing material web (11) and the new material web (12) to each other, wherein - the pressure elements (14, 15) are designed to connect the material webs (11, 12) during the movement in the conveying direction (18) of the outgoing and the new material web (11, 12), and wherein - the device (10) is designed to produce a weakening line (19, 20), preferably a perforation line, in each of the running and new material webs (11, 12) and to separate the material webs (11, 12) by applying an increased tensile stress in the material webs (11, 12) at the weakening lines (19, 20), preferably the perforation lines.
2. Device (10) according to claim 1, characterized in that - the pressure surfaces (16, 17) of the pressure elements (14, 15) are embossed surfaces, and the pressure elements (14, 15) are arranged to produce an embossed connection (21) when the running-off and the new material web (11, 12) are pressed against each other.
3. Device (10) according to claim 1 or 2, characterized in that - the device (10) has an adhesive sheet holder (22) which is designed to hold a double-sided adhesive sheet (23) between the running-off and the new material web (11, 12), wherein - the pressure elements (14, 15) are designed to produce an adhesive bond (24) between the material webs (11, 12) together with the adhesive sheet (23) when the running-off material web and the new material web (11, 12) are pressed against one another.
4. Device (10) according to one of the preceding claims, characterized in that - the device (10) is designed to increase the tensile stress in the new material web (12) and / or in the running-off material web (11) during the production of the embossed connection (21) and / or the adhesive connection (24) in order to separate the material web (11, 12) by means of the respectively increased tensile stress.
5. Device (10) according to claim 4, characterized in that the device (10) is designed to - to separate the running material web (11) to build up an increased tensile stress in the running material web (11) between the weakening line (19) and a reel (25) with the running material web (11), and - to separate the new material web (3) an increased tensile To build up tension in the new material web (12) between the weakening line (20) and a pre-tension winder (27) with the new material web (12).
6. Device (10) according to one of the preceding claims, characterized in that - the pressure elements (14, 15) each have a curved pressure surface or embossing surface which runs on a material web (11, 12) during pressing or embossing.
7. Device (10) according to one of the preceding claims, characterized in that at least one weakening device (28, 29) is provided opposite to a conveying direction (18) in front of the connecting section (13) for the running-off material web (11) and / or the new material web (12), which weakening device is designed to produce a weakening line (19, 20) in a material web (11, 12).
8. Device (10) according to claim 7, characterized in that - the weakening device (28, 29) comprises a knife roller (30) and a counter roller (31), wherein the counter roller (31) is pivotable and is designed to come into contact with a material web (11, 12) when pivoting, to displace the material web (11, 12) and to press it against a knife roller (30).
9. Device (10) according to one of the preceding claims, characterized in that the pressure elements (14, 15) are arranged to produce a respective weakening line (19, 20) in the running-off and in the new material web (11, 12).
10. Device (10) according to one of the preceding claims, characterized in that the device (10) is designed to produce a weakening line (20) in the new material web (12) in the conveying direction (18) in relation to the connection, in particular embossed connection (21) and / or adhesive connection (24), and / or to produce a weakening line (19) in the running-off material web (11) opposite to the conveying direction (18) in relation to the embossed connection (21) or adhesive connection (4).
11. Device (10) according to one of the preceding claims, characterized in that a pivoting element (32) is provided which is designed to grip the new material web (12) from a new reel (26), to guide it through the connecting section (13) and to transfer it to a pre-tension winder (27).
12. Device (10) according to one of the preceding claims, characterized in that - the device (10) has a feed device (33) which has two reel holders (34, 35) for reels (25, 26) of the material webs (11, 12).
13. Device (10) according to one of the preceding claims, characterized in that - the feed device (33) has a turntable (36) on which the reel holders (34, 35) are arranged.
14. A method for joining material webs (11, 12) for the energy cell producing industry, characterized in that - the method is carried out using the device (10) according to one of the preceding claims. Method according to claim 14, characterized in that the device (10) has a pre-tension winder (27) with a diameter, wherein a portion of the new material web (12) is wound onto the pre-tension winder (27) from a reel (26) on a reel holder (35), the revolutions of the pre-tension winder (27) and the reel holder (35) being recorded, and the diameter and / or circumference of the reel (26) being calculated from the recorded revolutions.