Laminating device for laminating multilayer endless web for producing energy cells

Abstract

The invention relates to a laminating device for a multilayer endless web (3), the first endless web consisting of at least one insulating web (4, 6) and at least one electrode (5), for the production of energy cells, having a pressing device which laminates the multilayer endless web (3) while applying pressure. According to the invention, the pressing device has a pressing surface with at least one recess which is arranged in such a way that, when the pressure is applied, the recess overlaps at least one of the edges (14, 15, 16, 17) of the electrode (5, 7).

Description

Technical Field

[0001] The invention relates to a laminating device for laminating multi-layer endless webs for producing energy cells having the features of the preamble of claim 1 . Background Art

[0002] Energy cells or energy storage devices within the meaning of the present invention are used, for example, in motor vehicles, other land vehicles, ships, aircraft or in stationary installations, such as photovoltaic installations in the form of batteries or fuel cells, in which particularly large amounts of energy must be stored for long periods of time.

[0003] For this purpose, these energy cells have a structure formed by a large number of segments stacked in a pile. These segments are respectively formed by alternating anode sheets and cathode sheets, which are separated from each other by separators that are also produced in segments. These segments are pre-cut during the production process and then stacked in a predetermined order and connected to each other by lamination. Here, the anode sheets and cathode sheets are first cut from an endless web and then separately laid at intervals on an endless web of insulating material. Next, the "double-layer" endless web formed by the insulating material and the laid anode sheets or cathode sheets is then cut into segments again using a cutting device in a second step, wherein these segments are formed in a double layer by separators and the anode sheets or cathode sheets arranged thereon. If it is feasible or necessary in manufacturing technology, the endless web of the insulating material together with the laid anode sheet and cathode sheet can also be stacked before cutting, so as to form such an endless web, which has the first endless layer of the insulating material together with the anode sheet or cathode sheet laid thereon and the second endless layer of the insulating material together with the anode sheet or cathode sheet still laid thereon. The "four-layer" endless web is then cut into sections by means of a cutting device, and these sections have a first insulating sheet, an anode sheet, a second insulating sheet and a cathode sheet attached to the second insulating sheet in four layers in this case. The advantage of this solution is that one step can be saved. In addition, the cut electrode can also be laid on the endless insulating web and stacked into a three-layer endless web by another endless insulating web, and then a three-layer section with an insulating sheet, an electrode sheet and another insulating sheet is cut from the three-layer endless web. The section in the sense of the present invention is therefore a single-layer section of the insulating material, the anode material or the cathode material, or a double-layer, three-layer or four-layer section of the above structure.

[0004] Furthermore, the above-mentioned "double-layer" or "quadruple-layer" endless web can also be supplemented to become a "three-layer" or "five-layer" endless web by laying another spacer web, and then the "three-layer" or "five-layer" endless web has a spacer web on both sides.

[0005] Alternatively, the electrodes can also be present as an endless web, i.e. uncut, in a "two-layer", "three-layer", "four-layer" or "five-layer" endless web, which is then cut into relatively large lengths and then, for example, rolled up. Alternatively, the endless web can also be first wound up and then cut after the winding has been completed. In this case, the electrodes are not present as spaced-apart sections in the endless web, but rather as a single section which extends without interruptions in the gap between the separating webs.

[0006] Furthermore, electrodes in the form of copper strips or copper foils or similar carrier materials with intermittent coatings can also be provided in the endless web, wherein the coatings each form elevations spaced apart in sections in the electrode.

[0007] In order to laminate "double-layer", "tri-layer", "quadruple-layer" or "quintuple-layer" endless webs, they are passed between two clamping devices, which apply pressure to the endless webs. Here, the electrodes and the separating webs are pressed in the endless webs. In principle, the electrodes and the separating webs are connected to each other and laminated by means of the clamping devices by applying pressure. In addition, the lamination can be assisted by the heat generation caused by the pressure. In addition, other heating zones or cooling zones can also be provided, which adjust the temperature of the endless webs during lamination. In order to achieve a high-quality connection, it is desirable that the endless webs are subjected to as equal pressure as possible in their longitudinal extension and transverse extension.

[0008] A problem here is that the electrode(s) are narrower than the endless web(s) of the isolating material, so that the isolating material laterally projects over the electrode(s). The electrode thus has free edges on its edge sides, while the isolating material laterally overlaps the electrode.

[0009] If the electrodes are already arranged in the endless web in the form of cut sections at a distance from one another, the electrodes form additional gaps in the endless web due to their spacing, wherein the electrodes in turn additionally hold the separating webs at a distance from one another in the gaps due to their thickness. The electrodes thus have additional free edges on the edge sides delimiting the gaps.

[0010] Since the pressing force can only be increased to a limited extent to ensure that the functionality of the electrodes is not impaired by excessive compaction, and since damage to the energy cell in the area of ​​the electrode edges is always detrimental to the quality of the energy cell and should therefore be avoided as much as possible, laminating endless webs in edge sections and, if applicable, in the gap area between the electrodes is problematic because free edges of the electrodes are present there. Summary of the invention

[0011] Against this background, the object of the present invention is to specify a laminating device which enables the lamination of endless webs while reducing the probability of damage to the electrodes in the edge region.

[0012] To achieve this object, according to the invention, a laminating device is proposed having the features of claim 1. Further preferred developments of the invention can be gathered from the dependent claims, the drawings and the corresponding description.

[0013] According to a basic concept of the invention, it is proposed that the pressing device has a pressing surface with at least one recess, which is arranged in such a way that, when pressure is applied to the pressing surface, the recess overlaps at least one of the electrode edges.

[0014] By means of the recesses provided on the pressing surface in the proposed arrangement, a profile of the pressing surface is formed which enables a load relief (entlastung) of the electrode in the edge region. In this way, the pressing surface has a profile which is purposefully shaped by the recesses so that the endless web is not subjected to pressure in the edge region during lamination. On the contrary, the pressure for laminating the endless web can be increased without increasing the pressure in the electrode edge region and thus increasing the possibility of damage in the electrode edge region. Since an increase in pressure can be achieved, the separating webs can also be better connected to each other in the region between the electrodes, so that the electrodes are subsequently better fixed to each other in the laminated endless web produced and do not slip off. The same applies to the electrodes in the sections cut from the endless web, in particular during the subsequent operation of the energy cell. The proposed solution is particularly advantageous if the electrode is narrower than the separating web and the separating web protrudes laterally from the electrode.

[0015] It is further proposed that the pressing device laminates the multi-layer endless web in a laminating device under the introduction of heat. The lamination, i.e. the connection, of the endless webs of the separator material to each other and to the electrodes is achieved by means of the polymer in such a way that the polymer penetrates from one layer to another, which in turn is caused by adhesive forces acting at the interface. Adhesive forces can be achieved more easily by the introduction of heat. However, it must be ensured that the materials at the interface are not compacted to such an extent under the effect of the introduction of heat and pressure that the ion exchange, which is important for the functioning of the energy cell, is interrupted.

[0016] It is further proposed that at least one first recess and at least one second recess are provided on the pressing surface, which extend in the longitudinal direction of the endless web and are arranged at a distance from each other that is smaller than the distance between the edge sides of the electrode extending in the longitudinal direction of the endless web. The first and second recesses can relieve the electrode in the region of its front edge and rear edge in the feed direction even during the lamination process. Here, the distance between the first recess and the second recess is the distance between the edge sides of the recesses facing each other.

[0017] It is further proposed that a plurality of electrodes arranged at regular intervals from one another are provided in the endless web, and at least one third recess and at least one fourth recess are provided on the pressing surface, and the spacing between the fourth recess and the third recess is smaller than the length of the electrode in the longitudinal direction of the endless web. The third and fourth recesses have the same function as the first and second recesses and are arranged so that they cover the front edge and the rear edge of the electrode with respect to the longitudinal direction of the endless web during lamination. Here, the spacing between the third recess and the fourth recess is intentionally smaller than the length of the electrode, so that when the movement of the pressing surface is correspondingly synchronized with the endless web, the third recess and the fourth recess always coincide with the edge. The spacing between the third and fourth recess is here the spacing between the edge sides of the two recesses facing each other. If the endless web has an intermittent coating, the sections of the coating correspond to the electrodes, and the spacing between the coatings corresponds to the spacing between the electrodes.

[0018] Here, the first recess, the second recess, the third recess, and the fourth recess are shaped and arranged so that they complement each other to form a closed annular recess, which corresponds in shape to the shape of the outer edge of the electrode. Depending on the shape of the electrode, the annular shape of the recess can be rectangular, elliptical, or any other shape. Since the recess has a closed annular shape, all edges of the electrode are covered by the recess on the surface, thereby reducing the load during lamination.

[0019] It is further proposed that the hold-down device comprises two hold-down rollers with a circular cross section, which are arranged such that a gap is provided between their shell surfaces, through which gap the endless web is run. The proposed solution has the advantage that, by using the hold-down rollers in the proposed arrangement, lamination can preferably be achieved in drum operation with very high production capacities, i.e. endless web transport speeds.

[0020] It is further proposed that the gap has a gap width which is smaller than the thickness of the endless web. By means of the proposed dimensioning of the gap, the endless web can be conveyed through the gap so that the pressure required for lamination is applied by the pressure roller. A special feed movement of the pressure roller is therefore no longer necessary.

[0021] The first and / or second recess and / or third recess and / or fourth recess are preferably arranged on a section of the outer surface(s) of one or both pressure rollers. By forming the recess(s) in the outer surface(s) of the pressure roller(s), a pressure surface is directly formed that matches the contour of the electrode arranged in the endless web.

[0022] It is further proposed that the first recess and the second recess are arranged on the edge side of the shell surface. As a result, when the pressure roller rolls on the endless web, they abut against the edge section of the endless web. Here, the first recess and the second recess can be realized in the form of a ring that is closed around the shell surface, so that the first and second recesses abut against the endless web without interruption and relieve the load in the area of ​​the side edge of the electrode.

[0023] It is further proposed that the third and fourth recesses are arranged parallel to the rotation axis of the pressure roller and each recess a section of the shell surface, and that the third and fourth recesses are spaced apart from one another over the development of the shell surface arc length, which spacing is smaller than the length of the electrode in the longitudinal direction of the endless web. With the proposed solution, the pressure roller with its third and fourth recesses always precisely overlaps the front and rear edges of the electrode in the feed direction of the endless web when the rotational movement of the pressure roller and the conveying movement of the endless web are correspondingly synchronized. The spacing between the third and fourth recesses is here the developed length of the shell surface between the edge sides of these recesses facing each other.

[0024] Here, the pressure roller is preferably arranged so that their rotational axes are oriented parallel to each other. By the arrangement of the proposed pressure roller, these pressure rollers can be coupled and / or synchronized by a transmission of simple structure particularly simply. In addition, the particularly compact structure of the laminating device can be realized thus.

[0025] It is further proposed that the clamping device has at least one clamping belt, which is arranged so that it abuts on one of the surfaces of the endless web. The clamping force acting on the endless web can be balanced by the clamping belt. Here, the clamping belt preferably can have the same or larger width transverse to the feeding direction of the endless web, so that the endless web is subjected to the clamping force over its entire width and is laminated. The clamping belt can be constructed so that it itself produces pressure or is applied with pressure via a pressure generating device separated, such as a clamping roller. In the latter case, the pressure is further transmitted to the endless web by the clamping belt. The clamping belt itself can be constructed in the form of a flexible fiber-reinforced fabric belt, a steel belt or a very thin articulated chain or the like. The clamping belt can be constructed as a driven endless belt, or a fixed clamping belt with a surface that reduces friction. If the clamping belt is constructed as a driven endless belt, it can be used additionally to transmit the endless web. If, on the other hand, the pressure belt is formed by a fixed-position pressure belt, additional devices are required to convey the endless web, which in this case is actively pulled through the pressure belt.

[0026] Here, the first recess and / or the second recess and / or the third recess and / or the fourth recess can also be arranged on the surface of the pressure belt in this case, which has the advantage that the pressure belt rests on the surface of the endless web and thus directly applies or transmits the pressure force. Therefore, by arranging the recesses therein, the pressure belt itself is matched in its contour to the shape and geometry of the endless web and the electrode(s) arranged thereon.

[0027] It is further proposed that two pressing belts are provided, which are arranged so that a gap is provided between their opposing surfaces facing the endless web, through which the endless web runs. The endless web can thus be subjected to pressure from both sides and pressed.

[0028] The gap width of the gap is preferably slightly smaller than the thickness of the endless web, so that the endless web automatically absorbs the pressure force for lamination with the aid of the running and corresponding pressure belts.

[0029] It is further proposed that the pressing device has two pressing surfaces arranged opposite to each other, with which the pressing device rests on different sides of the endless web, and

[0030] A first recess and / or a second recess and / or a third recess and / or a fourth recess are arranged on the pressing surface, and the first recess, the second recess, the third recess and / or the fourth recess of the pressing surface have different spacings and / or different depths and / or shapes to each other.

[0031] By means of different spacings between the recesses, the pressure surface can be configured in a shape that is individualized to the contours of the two side surfaces of the endless web. If the endless web is formed, for example, as a four-layer or five-layer endless web according to the structure described at the beginning, with cathodes and anodes arranged therein, it is possible to take into account the case where the anode is in principle larger than the cathode and the spacing between the anode edges to be protected is larger than the cathode edges. In addition, the recesses can have different depths, so that the applied pressure can be adapted differently to the surface of the endless web in terms of its distribution and size. In addition, by means of different shapes of the recesses, different orientations of the electrode edges can be taken into account.

[0032] It is further proposed that the pressing surface is adjustable in width. The laminating device can be set for laminating endless webs of different widths by virtue of the width adjustability of the pressing surface. The width of the pressing surface here refers to the direction in the plane of the endless web perpendicular to the longitudinal direction of the endless web.

[0033] Furthermore, the pressing surface can preferably have a width which corresponds to the width of the endless web or four times thereof. With the proposed solution, the laminating device is designed specifically for laminating an endless web of a certain width or also for laminating a plurality of endless webs of a certain width arranged in parallel. If the pressing surface is adjustable, a predetermined position of the width of the pressing surface can also be set for this purpose, so that the pressing surface can be adjusted with minimal effort from a position for laminating a single endless web to a position for two or more endless webs arranged in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is described below with reference to the accompanying drawings according to preferred embodiments.

[0035] Figure 1 : shows a section of a laminating device with three layers of endless web and a holding device with two holding rollers; and

[0036] Figure 2 : shows a section of a laminating device with three layers of endless webs and a pressing device with two pressing rollers and two pressing belts;

[0037] Figure 3 : shows a section of a laminating device with four layers of endless web and a holding down device with two holding down rollers. DETAILED DESCRIPTION

[0038] Figure 1A section of a laminating device according to the invention can be seen in FIG. The laminating device comprises a pressing device with two pressing rollers 1 and 2, which are designed as cylindrical rollers with a circular cross section. The pressing rollers 1 and 2 are oriented with their rotation axes parallel to each other and are arranged so that there is a gap S between their shell surfaces 12 and 13, which has a constant gap width SW in the direction of the rotation axis, i.e. perpendicular to the illustrated plane.

[0039] Furthermore, an endless web 3 to be laminated is provided, which runs through a gap S and has a thickness D. The endless web 3 is formed by a "three-layer" endless web 3 with a separator web 4 on the upper side and a separator web 6 on the lower side and an electrode 5 arranged therebetween. The electrodes 5 are arranged at the same distance A from one another with gaps 8 and have a smaller width than the separator webs 4 and 6, so that the separator webs 4 and 6 extend laterally beyond the electrodes 5.

[0040] The gap width SW of the gap S is dimensioned to be smaller than the thickness D of the endless web 3, so that the endless web 3 is slightly compacted together and laminated when passing through the gap S. The thickness D2 of the isolation webs 4 and 6 is 15 to 25 μm, respectively, while the electrode 5 has a thickness D1 of 150 to 400 μm. Therefore, in the embodiment shown, the thickness D of the electrode web 3 is about 180 μm to 450 μm. The gap width SW is dimensioned to be 20 to 100 μm, preferably 40 to 60 μm, smaller than the thickness D of the endless web, so that the endless web 3 is slightly compacted when passing through the gap S. The gap 8 is formed by the spacing of the electrodes 5 and has a height corresponding to the thickness D1 of the electrodes 5, i.e. 180 to 400 μm. In addition, the gap 8 has a length along the feed direction, which corresponds to the spacing A of the electrodes 5, which is 3 mm between the anodes and 6 mm between the cathodes, wherein it is worthwhile to set the size of the spacing A between the electrodes 5 to be as small as possible to increase the material utilization of the endless web 3 and the number of electrodes 5 on a predetermined length of the endless web 3.

[0041] The endless web 3 is conveyed in the feeding direction T and is pulled through the gap S. The pressure rollers 1 and 2 can themselves be actively driven, for example by separate drives in the form of servomotors, to rotate in the direction opposite to the arrow P, so that the pressure rollers additionally actively convey the endless web 3 by friction locking. Alternatively, however, the pressure rollers 1 and 2 can also be mounted only rotatably, so that they themselves are driven by the endless web 3 by friction locking to perform a rotational movement. In this case, the pressure rollers 1 and 2 only passively roll on the surface of the endless web 3.

[0042] A third recess 10 and a fourth recess 11 are provided on the two pressure rollers 1 and 2 in the form of radially inwardly directed depressions in the outer surfaces 12 and 13, which are arranged in such a way that they cover at least one of the edges 14, 15, 16 or 17 of the electrode 5 during the rotational movement of the pressure rollers 1 and 2. Furthermore, the third recess 10 and the fourth recess 11 are longer than the distance A between the electrodes 5 over the development of a circumferential section about the rotational axis of the pressure rollers 1 and 2, so that they cover two edges 14 and 16 as well as 15 and 17 of the two opposing electrodes 5 on one side, respectively. The third recess 10 and the fourth recess 11 are arranged on the pressure rollers 1 and 2 in such a way that they are positioned in the region of the edges 14, 15, 16 and 17 during the transport movement of the endless web 3 and the rotational movement of the pressure rollers 1 and 2 on the endless web 3, so that the electrode 5 is relieved in the region of the edges 14, 15, 16 and 17.

[0043] In addition to the third recess 10 and the fourth recess 11, other recesses (not shown) may be provided on the pressure rollers 1 and 2, which are arranged on the shell surfaces 12 and 13 so that the extended length of the arc segment between the third recess 10 and the fourth recess 11 and the other recesses in the rotation direction of the pressure rollers corresponds to the length of the electrode 5 at most. Therefore, the third recess 10 and the fourth recess 11 and the other recesses always cover the edges 14, 15, 16 and 17 of the electrode 5 on the gap 8. In the description of the present invention regarding the third and fourth recesses 10 and 11 and the subsequent description of the first and second recesses, the designations first, second, third and fourth do not imply any order or hierarchy. Therefore, the designations "third" and "fourth" do not necessarily presuppose the presence of the first and second recesses, and vice versa. These designations are only for distinguishing the recesses, wherein the recesses are defined according to their orientation and arrangement relative to each other.

[0044] The shell surfaces 12 and 13 form the pressing surfaces of the pressing device, which, by forming the third recess 10 and the fourth recess 11 and other recesses (if any), individually contour the endless web 3 to be laminated. For the sake of clarity, the first recess 10 and the fourth recess 11 as well as the gap 8 are exaggerated.

[0045] Figure 2 An alternative embodiment of the present invention is shown in FIG. Here, in addition to the two pressure rollers 1 and 2, the pressure device also includes two pressure belts 20 and 21, which are respectively attached to the upper side and the lower side of the endless web 3. The pressure rollers 1 and 2 are connected here with Figure 1The pressure rollers 1 and 2 are constructed and arranged identically, with the only difference being that they are constructed as cylindrical rollers with shell surfaces 12 and 13 of the same radius, i.e., without recesses on the circumference. The pressure rollers 1 and 2 rest on the free surfaces of two pressure belts 20 and 21. The pressure belts 20 and 21 are provided with a third recess 10 and a fourth recess 11 on their surfaces facing the endless web 3, thereby forming a pressure surface of the pressure device acting on the endless web 3. However, if this is advantageous for lamination, the pressure rollers 1 and 2 can also have different diameters and radii.

[0046] The dimensions and arrangement of the third recesses 10 and the fourth recesses 11 of the pressure belts 20 and 21 correspond to the third recesses 10 and the fourth recesses 11 on the pressure rollers 1 and 2 of the first embodiment. In this case, the decisive gap S and the gap width SW for laminating the endless web 3 are defined by the spacing of the pressure belts 20 and 21, so that the shell surfaces 12 and 13 of the pressure rollers 1 and 2 connecting them have a spacing that is increased by the sum of the thicknesses of the pressure belts 20 and 21. The third and fourth recesses 10 and 11 have a spacing U of the edge sides facing each other, which is smaller than the length of the electrode 5 in the conveying direction T. In addition, further recesses can be arranged on the pressure belts 20 and 21, which also have a spacing from each other that is smaller than the length of the electrode 5 in the feeding direction T of the endless web 3. In this case, the spacing of the recesses is the spacing of the edge sides of the recesses facing each other.

[0047] Alternatively or additionally, in Figure 1 In the embodiment of the present invention, in addition to the third and fourth recesses 10 and 11 on the edge sides of the pressure belts 20 and 21 or the pressure rollers 1 and 2, further first and second recesses can be provided, which are arranged so that they cover the side edges of the electrode 5 pointing in the feeding direction T of the endless web 3. In this way, the side edges of the electrode 5 in the endless web 2 are also relieved during lamination.

[0048] If both the third and fourth recesses 10 and 11 and the first and second recesses are provided, the third and fourth recesses 10 and 11 as well as the first and second recesses can be supplemented to form a recess having a closed annular shape, wherein the annular shape corresponds to the edge course of the electrode 5. If the electrode 5 is designed to be rectangular, for example, the recess is preferably designed in the form of a closed rectangular ring and completely covers the edge of the electrode 5 on one side.

[0049] The third and fourth recesses 10 and 11 may be provided on the pressure rollers 1 and 2 or the pressure belts 20 and 21 in a repeating regular arrangement that corresponds to the pattern of the edges of the electrodes 5 in the endless web 3 .

[0050] Figure 3, in which the endless web 3 is formed by a “four-layer” endless web 3 with a separator web 4 on the upper side and a middle separator web 6, a plurality of anodes 18 arranged between the separator webs 4 and 6, and a plurality of cathodes 7 arranged below the middle separator web 6. The anodes 18 are configured to be larger than the cathodes 7, so that the anodes 18, when arranged in pairs with the cathodes 7, have a smaller end-to-end distance A relative to each other than the cathodes 7. Thus, the third and fourth recesses 10 and 11 in the lower pressure roller 1 that rests on the cathode side of the endless web 3 have a longer length in the development in the circumferential direction of the pressure roller 1 than the third and fourth recesses 10 and 11 in the upper pressure roller 2 that rests on the anode side of the endless web 3. The third and fourth recesses 10 and 11 on the upper pressure roller 2 have a length in the expansion of the recessed shell surface 12 along the rotation direction P of the pressure roller 2, which is dimensioned so that these recesses cover the gaps 8 between the anodes 18 and the edges 14 and 16 of two adjacent anodes 18 when they are in contact with the upper separating web 4. The third and fourth recesses 10 and 11 on the lower pressure roller 1 have a length in the expansion of the recessed shell surface 13 along the rotation direction P of the pressure roller 1, which is dimensioned so that these recesses cover the gaps 8 between the cathodes 7 and the edges 15 and 17 of two adjacent cathodes 7 when they pass over the endless web 3.

[0051] The pressure rollers 1 and 2 here form a pressure generating device, which here applies pressure to the pressure belts 20 and 21. However, it is also possible to use a strip of carpet, a punching unit with corresponding pressure cylinders, a pneumatic pressure generating device with, for example, an inflatable cushion or the like as a pressure generating device, as long as they are suitable for applying the required pressure uniformly to the pressure belts 20 and 21.

[0052] In these embodiments, the endless web 3 and the cut electrodes 5 are described for lamination, which are arranged at a distance A from each other. However, it is also conceivable to laminate the endless web 3 with the endless electrode web using a laminating device. In this case, the third and fourth recesses 10 and 11 are omitted, and only the first and second recesses are provided in the region of the edge side of the pressing surface. The first and second recesses are arranged corresponding to the direction of the two longitudinal edges of the electrode web and cover the two longitudinal edges with the desired load relief effect during lamination.

[0053] The first and second recesses extend along the longitudinal direction of the pressing surface and the endless web 3 to be laminated and the feed direction T, and can therefore also be regarded as longitudinal grooves in the pressing surface, which are arranged parallel to each other and have a spacing from each other that is smaller than the width of the electrode web, wherein the spacing between the first and second recesses is the spacing between the edge sides of the recesses facing each other.

[0054] The third and fourth recesses 10 and 11 extend transversely to the pressure surface and the endless web 3 to be laminated and the feeding direction T, and can therefore also be regarded as transverse grooves, which are each spaced apart from one another at a distance (U) which is smaller than the length of the electrode 5 in the longitudinal direction of the endless web 3. If the third and fourth recesses 10 and 11 on the pressure rollers 1 and 2 correspond to Figure 1 and 3 The spacing U then corresponds to the length of the arc length of the flank surfaces 12 and 13 between the mutually facing edge sides of the third and fourth recesses 10 and 11 .

[0055] Due to the small size of the cathode and the resulting Figure 3 The electrode on the anode side of the diagram above is compared to the Figure 3 The spacing A of the electrodes 5 on the cathode side in the lower part of the illustration is larger, so the third and fourth recesses 10 and 11 of the pressure roller on the cathode side have a smaller spacing U from each other and, in order to cover the larger gap 8, are even constructed to be larger than the third and fourth recesses 10 and 11 on the pressure roller 2 resting on the anode side of the endless web 3.

[0056] If the electrode 5 is arranged in the endless web 3 without being cut, i.e. in one piece, the gap 8 and therefore also the third and fourth recesses 10 and 11 are omitted, and only the first and second recesses are provided. Furthermore, the first and second recesses in the edge side of the contact surface can also be omitted individually or simultaneously, if corresponding relief of the edge is not required here, so that only the third and / or fourth recesses 10 and 11 can also be provided in this case. If an intermittently coated endless web is provided in the endless web 3, the gap 8 is arranged between the coating sections, and the first, second, third and / or fourth recesses 10, 11 in this case serve to relieve the endless web 3 in the region of the side edges of the coating sections during lamination.

[0057] Generally speaking, the pressing surface does not contact the electrode 5 in the region of the edge due to the recess, so that the load on the endless web 3 in the region of the edge of the electrode 5 is relieved during lamination.

[0058] Furthermore, the depth, shape and arrangement of the recesses can also be selected differently and individually designed in order to achieve an optimal pressure distribution.

[0059] The recesses are named as the first, second, third and fourth recesses only for the purpose of distinguishing the recesses. In order to realize the concept of the present invention, when the third and fourth recesses 10 and 11 are realized, the first and second protrusions do not necessarily have to be realized. In this case, the first protrusion according to claim 1 is realized by the third or fourth protrusion 10 or 11. The same applies to the opposite case, that is, the third and fourth protrusions 10 and 11 are not provided, but only the first and second protrusions are provided on the edge side of the pressing surface.

Claims

1. A laminating device for a multilayer endless web (3) consisting of at least one separator web (4, 6) and at least one electrode (5) for producing an energy cell, the laminating device comprising: - a pressing device which laminates the multi-layer endless web (3) under pressure, It is characterized in that The pressing device has a pressing surface with at least one recess, which is arranged such that when the pressure is applied, the recess overlaps at least one of the edges (14, 15, 16, 17) of the electrodes (5, 7).

2. The laminating device according to claim 1, characterized in that The pressing device laminates the multi-layer endless web (3) with the introduction of heat.

3. The laminating device according to claim 1, characterized in that - at least one first notch and at least one second notch are arranged on the pressing surface, the first notch and the second notch extend in the longitudinal direction of the endless web (3) and are arranged at a distance from each other, the distance being smaller than the distance between the edge sides of the electrode (5) extending in the longitudinal direction of the endless web (3).

4. The laminating device according to any one of claims 1 to 3, characterized in that - a plurality of electrodes (5) are arranged in the endless web (3) at regular intervals from one another, and - at least one third recess (10) and at least one fourth recess (11) are provided on the pressing surface, and - The distance (U) between the fourth recess (11) and the third recess (10) is smaller than the length of the electrode (5) in the longitudinal direction of the endless web (3).

5. Lamination device according to claims 3 and 4, characterized in that The first recess, the second recess, the third recess (10) and the fourth recess (11) are shaped and arranged such that they complement each other to form a recess, the shape of which corresponds to the shape of the outer edge of the electrode (5).

6. The laminating device according to any one of claims 1 to 5, characterized in that The holding-down device comprises two holding-down rollers (1, 2) of circular cross-section, which are arranged such that a gap (S) is provided between the outer surfaces (12, 13) of the holding-down rollers, through which gap the endless web (3) runs.

7. The laminating device according to claim 6, characterized in that - the gap (S) has a gap width (SW) which is smaller than the thickness (D) of the endless web (3).

8. Laminating device according to any one of claims 3 to 5 and any one of claims 6 or 7, characterized in that The first recess and / or the second recess and / or the third recess (10) and / or the fourth recess (11) are arranged on sections of one or more lateral surfaces (12, 13) of one or both pressure rollers (1, 2).

9. The laminating device according to claim 8, characterized in that The first recess and the second recess are arranged on edge sides of the shell surface (12, 13).

10. The laminating device according to any one of claims 8 or 9, characterized in that - the third recess (10) and the fourth recess (11) are arranged parallel to the rotation axis of the pressure rollers (1, 2), and The third recess (10) and the fourth recess (11) are at a distance (U) from each other over the arc length of the shell surfaces (12, 13), which is smaller than the length of the electrode (5) in the longitudinal direction of the endless web (3).

11. The laminating device according to any one of claims 6 to 10, characterized in that The pressure rollers (1, 2) are arranged in such a way that their axes of rotation are oriented parallel to one another.

12. The laminating device according to any one of claims 1 to 8, characterized in that The holding down device has at least one holding down belt (20, 21), which is arranged in such a way that it bears against one of the surfaces of the endless material web (3).

13. The laminating device according to claim 12, characterized in that The recess is arranged on a surface (18, 19) of the pressure belt (20, 21).

14. The laminating device according to any one of claims 12 or 13, characterized in that Two pressure belts (20, 21) are provided, which are arranged such that a gap (S) is provided between their opposite surfaces (18, 19) facing the endless web (3), through which gap the endless web (3) runs.

15. The laminating device according to claim 14, characterized in that - The gap width (SW) of the gap (S) is slightly smaller than the thickness (D) of the endless web (3).

16. The laminating device according to any one of claims 1 to 15, characterized in that The holding down device has two oppositely arranged holding down surfaces, with which the holding down device bears against different sides of the endless web (3), and - a first recess and / or a second recess and / or a third recess (10) and / or a fourth recess (11) are arranged on the pressing surface, and The first recess, the second recess, the third recess (10) and / or the fourth recess (11) of the pressing surface have different distances and / or different depths and / or different shapes relative to one another.

17. The laminating device according to any one of claims 1 to 16, characterized in that The contact surface is adjustable in width.

18. The laminating device according to any one of claims 1 to 17, characterized in that The width of the pressing surface corresponds to the width of the endless web (3) or four times thereof.

Images