Laminating device for laminating multilayer endless webs for producing energy cells

Abstract

The invention relates to a laminating device for a multilayer endless web (3), which is made of at least one separator web (4, 6) and at least one electrode (5), for producing energy cells, comprising a press device which laminates the multilayer endless web (3) while exerting a compressive force. The press device has two press surfaces (24, 25), by means of which the press device comes into contact with different faces of the endless web (3), and the press surfaces (24, 25) are controlled to different temperatures.

Description

[0001] Laminating device for laminating multi-layer continuous webs for the production of energy cells

[0002] The present invention relates to a laminating device for laminating multi-layer continuous webs for producing energy cells having the features of the preamble of claim 1.

[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 also in stationary systems such as photovoltaic systems in the form of battery cells or fuel cells, in which very large amounts of energy must be stored over longer periods of time.

[0004] For this purpose, such energy cells can have a structure consisting of a plurality of segments stacked together. These segments are each formed from alternating anode sheets and cathode sheets, separated from each other by separator sheets, also manufactured as segments. The segments are pre-cut during the manufacturing process and then stacked in a predetermined order and bonded together by lamination. The anode sheets and cathode sheets are first cut from a continuous web and then individually placed at intervals onto a continuous web of separator material.This subsequently formed "double-layered" continuous web of separator material with the applied anode or cathode sheets is then cut into segments again in a second step using a cutting device. In this case, the segments are formed in a double layer by a separator sheet with an anode or cathode sheet arranged on top. If this is technically feasible or necessary from a manufacturing perspective, the continuous webs of separator material with the applied anode or cathode sheets can also be placed on top of one another before cutting, thus forming a continuous web with a first continuous layer of separator material with anode or cathode sheets applied thereon and a second continuous layer of separator material with anode or cathode sheets applied thereon.This "four-layer" continuous web is then cut into segments using a cutting device. In this case, these segments are formed in four layers, comprising a first separator sheet, an anode sheet, a second separator sheet, and a cathode sheet lying on top of it. The advantage of this solution is that one cut can be eliminated. Furthermore, the cut electrodes can also be placed on a continuous separator sheet and stacked on top of each other by another continuous separator sheet to form a three-layer continuous web, from which three-layer segments comprising a separator sheet, an electrode sheet, and another separator sheet are then cut. Segments within the meaning of this invention are therefore single-layer segments of a separator material, anode material, or cathode material, or double-layer, three-layer, or four-layer segments of the structure described above.

[0005] Furthermore, the "double-layer" or "four-layer" continuous webs described above can also be supplemented by placing another separator web on the electrodes to form a "three-layer" or "five-layer" continuous web, which then has a separator web on each side. Alternatively, the electrodes can also be present as continuous webs, i.e. uncut, in the "double-layer", "three-layer", "four-layer" or "five-layer" continuous webs, which are then cut to considerably longer lengths and then wound up, for example. Alternatively, the continuous webs can also be wound first and then cut after winding is complete. In this case, the electrodes in the continuous webs are not present as spaced-apart segments, but instead in a single segment that extends uninterruptedly into the space between the separator webs.

[0006] Furthermore, an electrode in the form of a copper track or copper foil or a comparable carrier material with an intermittent coating can also be provided in the endless track, in which the coatings each form sectional, spaced-apart elevations in the electrode.

[0007] To laminate the "double-layer," "three-layer," "four-layer," or "five-layer" continuous webs, they are passed between two pressing devices that exert a compressive force on the continuous webs. In this process, the electrodes are pressed together with the separator webs in these continuous webs. Generally, the electrodes and separator webs are bonded and laminated using a pressing device that applies a compressive force. Lamination can also be assisted by the generation of heat caused by the compressive force. Furthermore, additional heating or cooling zones can be provided to regulate the temperature of the continuous webs during lamination. To achieve a high-quality bond, it is desirable that the continuous webs be subjected to as uniform a compressive force as possible across their longitudinal and transverse extensions.

[0008] One problem is that the electrodes and the separator material are made of materials with different thermal expansion coefficients, so that the continuous web after lamination and / or the segments cut from it are subsequently curved and / or can have a wavy shape.

[0009] Against this background, the object of the invention is to create a laminating device which enables laminating of the continuous webs and the segments cut therefrom with a smaller corrugation and curvature.

[0010] According to the invention, a laminating device having the features of claim 1 is proposed to achieve the object. Further preferred developments can be found in the subclaims, the figures and the associated description.

[0011] According to the basic idea of ​​the invention, it is proposed according to claim 1 that the pressing device has two pressing surfaces with which it comes into contact with different sides of the endless web, and the pressing surfaces are temperature-controlled differently.

[0012] By varying the temperature of the pressing surfaces, the heat input during lamination can be designed differently for the two different surfaces of the continuous web. This can at least reduce the temperature-related deformation of the continuous web by deliberately heating the side with the greater temperature-related expansion to a lesser extent or even cooling it. Alternatively, the side of the continuous web with the lower temperature-related expansion can also be deliberately heated to a greater extent. It is important that the continuous web is laminated with a temperature gradient between the two surfaces that is inverse to the different temperature-related expansions of the continuous web on its two surfaces.Additionally or alternatively, the pressing surfaces can also be designed such that they are each heated to different temperatures, i.e. have warmer zones and cooler zones, so that different thermal expansions due to different thermal expansion coefficients of the continuous web on a surface can be compensated for along its longitudinal extent. Furthermore, the lamination of the continuous web itself can be adapted along the continuous web, for example by heating zones of the continuous web that require greater heat for optimal lamination to a greater extent than zones that can be sufficiently laminated at a lower temperature. Furthermore, zones of the continuous web for which excessive heat is disadvantageous during lamination can deliberately not be heated or can be heated to a lesser extent. As a result, the continuous web can be laminated with less waviness or curvature using the solution according to the invention.Furthermore, the lamination of the continuous web can be adapted to the different thermal expansion coefficients in the surfaces and the different conditions for lamination as such by individually controlling the temperature of the pressing surfaces, thus enabling lamination of the continuous web with a significantly more homogeneous connection between the separator webs and the electrode^). It is further proposed that a plurality of regularly spaced electrodes be provided in the continuous web. Due to the spaced electrodes, the continuous web has different thermal expansion coefficients in the direction of its surface and in particular in the direction of its longitudinal extent in the transport direction, so that the problem of different thermal expansions is particularly significant here, and the advantage according to the invention is particularly evident.

[0013] It is further proposed that the endless web have at least two separator webs, and that the electrodes are formed by a plurality of anodes arranged in series and a plurality of cathodes arranged in series, which are separated from one another by one of the separator webs, wherein the pressing surface which comes into contact with the side of the endless web assigned to the cathodes has a lower temperature than the pressing surface which comes into contact with the side of the endless web assigned to the anodes. Due to the proposed further development, the endless web can be laminated with a lower heat input into the cathode side, so that the greater thermal expansion of the cathodes can be at least partially compensated and, ideally, the cathode side of the endless web undergoes heat-induced deformation identically to the anode side of the endless web.

[0014] Cathodes typically have a conductor foil made of aluminum or an aluminum alloy. In contrast, anodes typically have a conductor foil made of copper or a copper alloy. The thermal expansion coefficient of aluminum or an aluminum alloy is generally higher than that of copper or a copper alloy, which increases the thermal expansion of the cathode compared to the anode. It has proven advantageous if the pressing surfaces have a temperature of -40 to 150 degrees Celsius, preferably 55 to 80 degrees Celsius, with the pressing surfaces preferably having a temperature difference of 20 to 60 degrees Celsius, preferably 35-45 degrees Celsius. This can compensate for the different thermal expansion when using Cu and Al.

[0015] It is further proposed that individually temperature-controlled heating or cooling segments be provided in the pressing surfaces. The heating or cooling segments allow the temperatures of the pressing surfaces to be individually and / or locally adjusted, thereby allowing the temperature gradients between the two pressing surfaces and / or along the respective pressing surfaces to be individually adjusted. The temperature gradients are specifically adjusted to take into account the different thermal expansions of the continuous web at its various surfaces and / or along the respective surface.

[0016] Furthermore, the pressing surfaces can also have different thermal conductivity coefficients. This allows a central or identical heat source or heat sink to be used, and the different temperatures of the pressing surfaces are achieved through the different heat conduction caused by the different thermal conductivity coefficients of the pressing surfaces. The pressing surfaces therefore have different thermal conductivities.

[0017] Furthermore, the pressing surfaces can have different heat capacities, so that the introduced heat results in different temperatures of the pressing surfaces, as the heat is stored differently.

[0018] It is further proposed that the pressing device comprises two pressing rollers with a circular cross-section, and the pressing surfaces are formed by the lateral surfaces of the pressing rollers.

[0019] By designing the pressing device of the lamination device as press rollers, the lamination device can be particularly easily integrated into a drum run, which in turn is characterized by a particularly high production capacity and / or transport speed of the continuous web.

[0020] It is further proposed that the press rollers are arranged such that a gap is provided between their lateral surfaces through which the continuous web runs, wherein the gap has a gap width which is smaller than the thickness of the continuous web.

[0021] With the proposed solution, the continuous web is slightly compressed simply by the arrangement of the press rollers for lamination. This eliminates the need for additional feed motion of the press rollers.

[0022] The press rollers are preferably cylindrical with an identical diameter in the direction of their longitudinal axis. The press rollers are thus designed such that their outer surfaces are circular in a plane running perpendicularly through the axis of rotation and are aligned parallel to the axes of rotation in their longitudinal extents in the direction of the axes of rotation. The two outer surfaces thus form a gap between them with a gap width that is constant over its longitudinal extent and is independent of the angle of rotation of the press rollers. This results in a particularly simple construction of the lamination device in that the press rollers are arranged such that their axes of rotation are aligned parallel to one another. Due to the parallel arrangement of the axes of rotation, the press rollers can be coupled particularly easily to corresponding individual drive devices, wherein the individual drive devices can, for example,can be mounted on a common machine frame. Furthermore, the press rollers can be coupled particularly easily by means of a gear mechanism, e.g., in the form of a gear transmission with a plurality of gears arranged in a plane relative to one another.

[0023] It is further proposed that the pressing device has at least one press belt, and that the pressing surface is formed by a surface of the press belt coming into contact with one of the surfaces of the endless web. The press belt can make the pressing force acting on the endless web even. The press belt can preferably have an identical or greater width transverse to the transport direction of the endless web so that the endless web is exposed to the pressing force across its entire width and is thus laminated. The press belt can be designed so that it generates the pressing force itself or is subjected to a pressing force via a separate pressure generating device such as a press roller. In the latter case, the pressing force is transferred from the press belt to the endless web.The press belt itself can be designed in the form of a flexible fiber-reinforced textile belt, a steel belt, a very fine-link chain, or the like. The press belt can be designed as a driven endless belt or as a stationary press belt with a low-friction surface. If the press belt is designed as a driven endless belt, it can also be used to transport the endless web. If, however, the press belt is formed by a stationary press belt, an additional device is required to transport the endless web. In this case, the endless web is actively pulled past the press belt.

[0024] It is further proposed that at least two press belts, each with a pressing surface, be provided. The plurality of press belts allows the total pressing surface to be increased. If the press belts are arranged in series, this allows the length of the pressing surface to be increased, while if the press belts are arranged in parallel, the width of the pressing surface can be increased. Furthermore, by arranging the press belts at a distance from one another, a gap can be created through which the continuous web can be guided for lamination. The continuous web can be compressed from both sides so that the continuous web is laminated on both surfaces.

[0025] If the pressing device has press rollers, it is further proposed that these rollers rest against the free surface of the press belts and press the press belts against the endless web by exerting a compressive force. In this case, the press rollers form a pressure-generating device of the pressing device, which presses the press belts against the endless web.

[0026] It is further proposed that the press surface be adjustable in width. The width of the press surface allows the laminating device to be adjusted for laminating continuous webs of different widths. The width of the press surface is the direction perpendicular to the longitudinal direction of the continuous web in the plane of the continuous web.

[0027] Furthermore, the pressing surface can preferably have a width that corresponds to the width of the continuous web or a multiple thereof. With the proposed solution, the laminating device is specifically designed for laminating a continuous web of a specific width, or a plurality of continuous webs of a specific width can be laminated in a parallel arrangement. If the pressing surface is adjustable, predetermined positions of the widths of the pressing surface can also be provided for this purpose, so that the pressing surface can be adjusted with little effort from a position for laminating a single continuous web to a position for laminating two or more parallel continuous webs.

[0028] The invention will be explained below using preferred embodiments with reference to the attached figures.

[0029] Fig. 1 : a section of a laminating device with a four-layer continuous web and a pressing device with two press rollers; and

[0030] Fig. 2: a section of a lamination device with a three-layer continuous web and a pressing device with two press rollers and two press belts.

[0031] Figure 1 shows a section of a lamination device according to the invention, in which the continuous web 3 is formed by a "four-layer" continuous web 3 with a separator web 4 on the top side and a separator web 6 in the middle, a plurality of anodes 5 arranged between the separator webs 4 and 6, and a plurality of cathodes 7 arranged below the central separator web 6. The anodes 5 are larger than the cathodes 7, so that the anodes 5, when arranged in pairs with the cathodes 7, have a smaller end-to-end distance A from one another than the cathodes 7. The lamination device further comprises a pressing device with two press rollers 1 and 2, which are designed as cylindrical drums with a circular cross-section.The press rollers 1 and 2 are aligned with their axes of rotation parallel to each other and arranged so that between their lateral surfaces 12 and 13 there is a gap S with a gap width SW that is constant in the direction of the axes of rotation, i.e. perpendicular to the plane of representation.

[0032] The gap width SW of the gap S is smaller than the thickness D of the continuous web 3, so that the continuous web 3 is slightly compressed and laminated as it passes through the gap S. The thickness D2 of the separator webs 4 and 6 is 15 to 25 pm each, while the anodes 5 and the cathodes 7 have a thickness D1 of 150 to 400 pm. This results in a thickness D of the continuous web 3 of approximately 330 pm to 850 pm. The gap width SW is 20 to 100 pm, preferably 40 to 60 pm, smaller than the thickness D of the continuous web 3, so that the continuous web 3 is slightly compressed as it passes through the gap. The spaces 8 are formed by the spacing of the anodes 5 and the cathodes 7 and have a height which corresponds to the thickness D1 of the anodes 5 and the cathodes 7, i.e. 150 to 400 to pm.Furthermore, the spaces 8 have a length in the transport direction corresponding to the distance A of the electrodes 5 of 3 mm between the anodes and 6 mm between the cathodes, wherein it is desirable to dimension the distances A between the electrodes 5 as small as possible in order to increase the material utilization factor of the endless web 3 and the number of electrodes 5 in a predetermined length of the endless web 3.

[0033] The endless web 3 is fed in the feed direction T and pulled through the gap S. The press rollers 1 and 2 can themselves be actively driven, e.g. by individual drives in the form of servomotors, to rotate in opposite directions in the direction of the arrows P, so that they additionally transport the endless web 3 actively through frictional engagement. Alternatively, the press rollers 1 and 2 can also be mounted so that they are only rotatably mounted, so that they are themselves driven by the endless web 3 through frictional engagement to rotate. In this case, the press rollers 1 and 2 only roll passively along the surfaces of the endless web 3. Due to the passive rolling movement of the press rollers 1 and 2, their movement is synchronized with that of the endless web 3.

[0034] The upper press roller 2 rests with its outer surface 12 against the upper side of the separator web 4 and thus forms an upper pressing surface 24. The lower press roller 1 rests with its outer surface 13 against the surfaces of the cathodes 7, so that the outer surface 13 in this case forms a lower pressing surface 25 opposite the upper pressing surface 24. The press rollers 1 and 2 thus rest with their pressing surfaces 24 and 25 formed by the outer surfaces 12 and 13 against the free surfaces of the endless web 3 and, as the endless web 3 passes through the gap S, due to the smaller gap width SW in relation to the thickness D of the endless web 3, exert a compressive force on the endless web 3 from both sides, which causes the endless web 3 to be laminated. An alternative embodiment of the invention can be seen in Figure 2.In addition to the two press rollers 1 and 2, the pressing device here also comprises two press belts 20 and 21, which rest on the top and bottom of the endless web 3. The press rollers 1 and 2 are designed and arranged identically to the press rollers 1 and 2 in Figure 1 and differ only in that they do not rest directly on the endless web 3 to be laminated, but instead on the free surfaces of the press belts 20 and 21, which in turn rest on the endless web 3. The pressing surfaces 24 and 25 are thus formed by the surfaces of the press belts 20 and 21 facing the endless web 3. The gap S is thus formed by the space between the two pressing surfaces 24 and 25 of the press belts, and the gap width SW corresponds to the distance between the two pressing surfaces 24 and 25. The press belts 20 and 21 are dimensioned such that the gap width SW is smaller than the thickness of the endless web D.The thickness D of the endless web 3 in this case is 180 to 450 pm. This does not correspond to the illustration in Figure 2, in which the gap width SW is shown larger than the thickness D of the endless web 3 for the sake of clarity. However, to laminate the endless web 3, the press belts 20 and 21 must bear against the surfaces of the endless web 3 while exerting a compressive force, so that the gap width SW must be smaller than the thickness D of the endless web 3. For this purpose, the press rollers 1 and 2 can additionally press the press belts 20 and 21 against the endless web 3 and thus increase the compressive force exerted by the press belts 20 and 21.

[0035] Furthermore, the continuous web 3 to be laminated is provided, which runs through the gap S and has a thickness D. The continuous web 3 is formed by a "three-layer" continuous web 3 with a separator web 4 on the top side and a separator web 6 on the bottom side, with anodes 5 arranged between them. The anodes 5 are arranged with gaps 8 at identical distances A from one another and have a smaller width than the separator webs 4 and 6, so that the separator webs 4 and 6 project laterally beyond the anodes 5.

[0036] In the two pressing surfaces 23 and 24 of the pressing rollers 1 and 2 in the embodiment of Figure 1 or of the pressing belts 20 and 21 in the embodiment of Figure 2, a plurality of cooling or heating segments 23 are provided, which can be controlled individually or in groups and enable a different temperature control of the pressing surfaces 24 and 25 of the pressing rollers 1 and 2 or of the pressing belts 20 and 21 relative to one another.

[0037] Thus, the upper press roller 2 or the upper press belt 21, which comes into contact with the upper separator web 4 covering the anodes 5, i.e., on the anode side of the endless web 3, can have a temperature of 50 degrees Celsius on its press surface 24, while the lower press roller 2 or the lower press belt 20, which comes into contact with the undersides of the cathodes 7, i.e., on the cathode side of the endless web 3, has a temperature of 20 degrees Celsius on its press surface 23. Thus, the press surfaces 24 and 25 have a temperature difference of 30 degrees Celsius, with the press surface 23 on the anode side deliberately having a higher temperature and thus heating the endless web 3 on the anode side more than the press surface 24 on the cathode side of the endless web 3.

[0038] The temperature gradient between the pressing surfaces 24 and 25 can be controlled or regulated by controlling or regulating the temperature of the cooling or heating segments 23, so that the temperature gradient can be adapted to different anodes and cathodes, and in particular to their different combinations. For example, the adaptation can be the thickness of the conductor foils of the anodes, usually made of copper, and the cathodes, usually made of aluminum, the overall thickness of the anodes and cathodes, as well as the materials of the anodes and cathodes, conductor foil, and active material. In the present embodiment, the cooling or heating segments 23 are arranged in both pressing surfaces 25 and 24, so that the temperature difference between the pressing surfaces 25 and 24 can be realized by actively changing the temperature of both pressing surfaces 25 and 24.To achieve the temperature difference, it would also be conceivable to provide cooling or heating segments 23 only in one of the pressing surfaces 24 or 25 and to heat or cool only one of the pressing surfaces 24 or 25 accordingly.

[0039] Furthermore, a plurality of individually controllable cooling or heating segments 23 arranged at a distance from one another can be provided in the pressing surfaces 24 and 25, so that the pressing surfaces 24 and 25 can have different temperatures even in sections. In this way, for example, different thermal expansions of the endless web 3 in the direction of its longitudinal extent on the anode side and / or the cathode side can be taken into account. For example, the thermal expansion of the endless web 3 in the area of ​​the anodes 5 and the intermediate spaces 8 provided therebetween is different from the thermal expansion in the area of ​​the cathodes 7 and the intermediate spaces 8 provided therebetween, which is particularly due to the larger distances A between the cathodes 7 and the smaller distances A between the anodes 5 in the intermediate spaces 8. By means of the cooling or heating segments 23, the pressing surfaces 24 and 25 can, for example,in the sections with which it comes into contact with the sections of the endless track 3 with the greater thermal expansion in the area of ​​the centers of the anodes 5 and the centers of the cathodes 7, they are heated to a lesser extent than in the sections with which it comes into contact in the area of ​​the intermediate spaces 8. This results in different temperatures for the pressing surfaces 24 and 25 along their longitudinal extent and / or development in the form of a regular alternation of higher temperature and lower temperature zones. The lengths of the zones with the lower temperature depend on the length of the anodes 5 and the length of the cathodes 7, while the length of the zones with the higher temperature depends on the length of the intermediate spaces 8.Thus, for the lamination of the continuous web 3, different temperature zones are created in the respective pressing surfaces 24 and 25 in a distribution and dimensioning individually adapted to the respective distribution of the thermal expansion in the anode side and / or the cathode side of the continuous web 5.

[0040] Furthermore, the pressing surfaces 24 and 25 can also be differently tempered in the edge sections with which they come into contact with the edge sections of the endless web 3 that laterally border the anodes 5 and the cathodes 7 and run in the longitudinal direction of the endless web 3, by arranging and controlling individual cooling or heating segments 23. Overall, the pressing surfaces 24 and 25 of the press rollers 1 and 2 and / or the press belts 20 and 21 can be individually tempered by the arrangement of the cooling or heating segments 23 such that the lamination of the endless web 3 occurs with a heat distribution in the pressing surfaces 24 and 25 that is individually tailored to the specific distribution of thermal expansion in the endless web 3, whereby, ideally, a laminated, curvature-free endless web 3 can be realized after exiting the lamination device.

[0041] Of course, press belts 20 and 21 with differently tempered pressing surfaces 24 and 25 can also be combined with press rollers 1 and 2 with differently tempered pressing surfaces 24 and 25.

[0042] The cooling or heating segments 23 in the pressing surfaces 24 and 25 are preferably integrated into the pressing surfaces 24 and 25 in such a way that the pressing surfaces 24 and 25 are formed homogeneously and continuously.

[0043] Furthermore, in addition to or instead of the cooling or heating segments 23 in the pressing surfaces 24 and 25, zones with different thermal conductivity coefficients can also be provided in the pressing surfaces 24 and 25. In this case, central heat sources or heat sinks can be assigned to the pressing belts 20 and 21 and / or the pressing rollers 1 and 2, which, in conjunction with the zones with different thermal conductivity coefficients, effect different temperature control of the pressing surfaces 24 and 25.

Claims

Claims:

1. Laminating device for a multi-layer continuous web (3) comprising at least one separator web (4, 6) and at least one electrode(s) for producing energy cells, comprising - a pressing device which laminates the multi-layer continuous web (3) by exerting a compressive force, characterized in that -the pressing device has two pressing surfaces (24, 25) with which it comes into contact with different sides of the endless web (3), and -the pressing surfaces (24,25) are at different temperatures.

2. Laminating device according to claim 1, characterized in that -a plurality of electrodes arranged at regular intervals from one another are provided in the endless track (3).

3. Laminating device according to claim 2, characterized in that -the endless web (3) has at least two separator webs (4,6), and -the electrodes are formed by a plurality of anodes (5) arranged in series and a plurality of cathodes (7) arranged in series, which are separated from one another by one of the separator tracks (4, 6), wherein -the pressing surface (24, 25) which comes into contact with the side of the endless web (3) associated with the cathodes (7) has a lower temperature than the pressing surface (24, 25) which comes into contact with the side of the endless web (3) associated with the anodes (5). web (3) comes to rest. Laminating device according to one of claims 1 to 3, characterized in that -the pressing surfaces (24, 25) have a temperature of -40 to 150 degrees Celsius, preferably of 55 to 80 degrees Celsius. Laminating device according to one of claims 1 to 4, characterized in that -the pressing surfaces (24, 25) have a temperature difference of 20 to 60 degrees Celsius. Laminating device according to one of claims 1 to 5, characterized in that -individually temperature-controlled heating segments (23) or cooling segments are provided in the pressing surfaces (24, 25). Laminating device according to one of claims 1 to 6, characterized in that -the pressing surfaces (24, 25) have different thermal conductivity coefficients. Laminating device according to one of claims 1 to 7, characterized in that -the pressing surfaces (24, 25) have different heat capacities. Laminating device according to one of claims 1 to 8, characterized in that -the pressing device comprises two pressing rollers (1, 2) with a circular cross-section, and -the pressing surfaces (24,25) are formed by the outer surfaces (12,13) ​​of the pressing rollers.

10. Laminating device according to claim 9, characterized in that -the press rollers (1, 2) are arranged so that a gap (S) is provided between their outer surfaces (12, 13), through which the endless web (3) runs, wherein -the gap (S) has a gap width (SW) which is smaller than the thickness (D) of the endless web (3).

11. Laminating device according to one of claims 9 or 10, characterized in that -the press rollers (1, 2) are cylindrical with an identical diameter in the direction of their longitudinal axis.

12. Laminating device according to one of claims 9 to 11, characterized in that -the press rollers (1, 2) are arranged such that their axes of rotation are aligned parallel to each other 13. Laminating device according to one of claims 1 to 12, characterized in that -the pressing device has at least one pressing belt (20, 21), and -the pressing surface (24,25) is formed by a surface of the pressing belt (20,21) which comes into contact with one of the surfaces of the endless web (3).

14. Laminating device according to claim 13, characterized in that -at least two press belts (20, 21), each with a pressing surface (24, 25), are provided. Laminating device according to one of claims 9 to 12 and according to one of claims 13 or 14, characterized in that -the press rollers (1, 2) rest against the free surface of the press belts (20, 21) and press the press belts (20, 21) against the endless web (3) by exerting a compressive force. Laminating device according to one of claims 1 to 15, characterized in that -the pressing surface (24, 25) is adjustable in width. Laminating device according to one of claims 1 to 16, characterized in that -the pressing surface (24, 25) has a width which corresponds to the width of the endless web (3) or a multiple thereof

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