Method and device for adhesively connecting layers of energy cell

Abstract

A method for producing a stack-shaped energy cell having a plurality of separators and a plurality of electrodes, i.e. Alternately arranged anodes and cathodes, arranged between the separators, at least one electrode being fixed to at least one of the separators by means of an adhesive connection, and a particularly precise adhesive connection is provided. Wherein an adhesive for the at least one adhesive connection is applied in an intaglio printing method.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a stacked energy battery, wherein the stacked energy battery has a plurality of separators and a plurality of electrodes arranged between the separators, namely anodes and cathodes arranged alternately, wherein at least one electrode is fixed to at least one of the separators by means of an adhesive connection, and to an apparatus for manufacturing a stacked energy battery, wherein the stacked energy battery has a plurality of separators and a plurality of electrodes arranged between the separators, namely anodes and cathodes arranged alternately, wherein the separators and the electrodes are conveyed individually or in a prefabricated composite unit consisting of at least two components for forming a stack, the apparatus comprising a stacking station in which the stack is formed by individual components and the prefabricated composite unit, and comprising at least one adhesive coating device, which is designed and established for applying adhesive to at least one of the conveyed components. Background Art

[0002] Energy cells or energy storage devices in the sense of the present invention are used, for example, in motor vehicles, other land vehicles, ships, aircraft or in fixed facilities (such as photovoltaic facilities in the form of battery cells or fuel cells), where very large amounts of energy must be stored over a large period of time. For this purpose, such energy cells have a structure consisting of a large number of segments stacked in a stack. These segments are respectively formed by alternating anode sheets and cathode sheets, which are separated from each other by separator sheets that are also present in the form of segments. Various methods are known for manufacturing stacks. Usually, the segments are pre-cut in the manufacturing process, and then the separator-anode-separator-cathode is stacked in a predetermined order for stacking, and connected to each other by lamination. The four-layer stack formed in this way is called a single cell. In another method, the anode sheets and cathode sheets are first cut from a continuous web, and then the anode sheets and cathode sheets are placed on the continuous web of the separator material in a dispersed manner and spaced apart. Then in the second step, the "double-layer" continuous web made of the separator material with the placed anode and cathode sheets is cut into segments by the cutting device again, wherein in this case, these segments are formed by the separator sheet and the anode or cathode sheet arranged thereon in double layers. As long as this is feasible or necessary in production technology, the continuous web of the separator material with the placed anode and cathode sheets can also be stacked before cutting, so as to form a continuous web with the separator material and the first continuous layer of the anode or cathode sheet placed thereon and the separator material and the second continuous layer of the anode or cathode sheet placed thereon. Then this "four-layer" continuous web is cut into segments by means of a cutting device, thereby forming a single cell again. The fixing of the corresponding layer or sheets on the layer is usually carried out by means of lamination. Fixing is very important because these segments must be stacked together very accurately with only a small tolerance and cannot be displaced from each other. Thus, the separator must safely separate the anode and cathode from each other to avoid short circuits. Devices and methods for producing cell stacks for producing battery cells are known, for example, from DE 10 2017 216 138 A1 and DE 10 2017 216 213 A1 or DE 10 2018 219 000 A1.

[0003] Lamination is an energy-intensive process and the production costs of the lamination unit(s) are very high. In addition, suitable materials must be used for the lamination process. Thus, in particular the separators must be laminable, which greatly limits the choice of possible materials to be used and in particular other requirements (such as small layer thicknesses) must also be met.

[0004] Therefore, alternative possibilities for fixing the layers one above the other are proposed. Thus, it is known from EP 3588653 A1 to provide the anode and cathode sheets with adhesive by means of adhesive nozzles and thereby produce a web with adhesively bonded electrodes, from which the individual cells are cut in turn.

[0005] Adhesive application from a nozzle is problematic. It is difficult to obtain a clean application of adhesive when applying the adhesive transversely to the direction of travel of the web. In particular, the low viscosity of the adhesive used makes precise application difficult. Controlling the process is difficult because the web must be pulled through the standing nozzle at a predetermined web tension. It would therefore be desirable to provide an apparatus and method that enables adhesive application without the use of a nozzle.

[0006] Another problem arises during further processing, i.e. when a number of these cells must be joined together by stacking to form a finished energy cell. The stacked cells must also be fixed to one another to prevent slipping. In the prior art, this is done either by lamination. Alternatively, the stack is fixed with adhesive tape and, if necessary, guided and laminated afterwards by "hot pressing" in a subsequent process. This presents the problem of producing a stack without directly fixing it. The cells are produced by lamination and / or bonding and joined together to form a non-homogeneous stack. Attempts are made to connect (homogenize) the entire stack afterwards in some cases. Summary of the invention

[0007] The object of the present invention is therefore to provide a method and a device which create a homogeneous energy cell, ensure secure fixing of the individual layers on top of each other, can also withstand subsequent processes such as cutting and enable secure fixing at the desired position and ensure clean, clear application of adhesive.

[0008] This object is achieved in that, in a method of the type mentioned at the outset, the adhesive for the at least one adhesive connection is applied using a gravure printing method and in a device of the type mentioned at the outset, the at least one adhesive application device is a gravure printing roller.

[0009] Such gravure printing roller has depressions for receiving and transporting adhesive at its outer body surface, wherein the depressions produce corresponding adhesive images on the layer to be provided with adhesive. Here, different depressions can have the same or different depression volumes per area.

[0010] In this way, it is possible to place punctured, clear single or multiple adhesive points or any other desired adhesive pattern onto the electrodes or, in particular, the separators, thereby ensuring very good fixing of the electrodes and separators.

[0011] It is possible that only some of the adhesive connections to be performed are applied with the aid of a gravure roller, while for other adhesive connections the adhesive is applied, for example, by means of a nozzle. However, it is particularly advantageous if all required adhesive applications are carried out with a gravure printing method.

[0012] Particularly advantageously, the anodes are conveyed on conveyor path A, the cathodes on conveyor path B, and the separator sheets are conveyed on conveyor paths C and D, respectively, as separator webs, a continuous web with cut cathode and anode segments is first formed from the two separator webs and the anodes and cathodes, all connections of the separators and electrodes being formed by means of adhesive connections, and the continuous web is separated into individual cells in a further step. In this way, the production speed can be increased, and there is the advantage that the quality of the individual products can be tested in a continuous area.

[0013] This object is further achieved by forming a stacked energy battery in the case of a method of the type mentioned at the outset by stacking a plurality of single cells, wherein the single cells are fixed one above the other by means of an adhesive connection, or - in the case of an energy battery that is not manufactured by an intermediate step of forming single cells, but by alternately stacking a desired number of electrodes and separators - by fixing them in the following way, namely applying the adhesive by alternately stacking separators and electrodes immediately before the stack of the stacked energy battery is formed.

[0014] "Immediately before the stack is formed" means in particular that the adhesive is applied to the electrode / separator section when the electrode / separator section is located on the acceleration roller. Ideally, the adhesive is applied on the acceleration roller, because here the product has the correct orientation and the speed can be adapted if this is necessary. At certain positions of the acceleration roller, there is a stationary or constant speed, while at other positions it is accelerated. The term "immediately before the stack is formed" also includes alternative embodiments. Alternatively, the adhesive can be applied to the stack when it is lowered. This can advantageously be done by lowering the handle or after lowering by an additional moved device.

[0015] Finally, the object is achieved by a device of the type mentioned at the outset, which has a single cell stacking device for stacking a plurality of single cells to form a stacked energy battery, wherein an adhesive coating device is assigned to the stacking device, or - again for the case where the energy battery is not manufactured by an intermediate step of forming single cells, but by alternately stacking a desired number of electrodes and separators - the device has a stacking device for forming a stacked energy battery by alternately stacking separators and electrodes, wherein an adhesive coating device is assigned to the stacking device.

[0016] Here, the adhesive is applied directly at the stacking wheel, that is, directly during the stacking process. This inline bonding process allows the fixing to be integrated into the manufacturing process without interference. The fixing is carried out by bonding directly when the individual layers or cells are stacked on top of each other, so that no process steps can be skipped or the method duration must be managed, wherein the stack is in a form in which it is stacked but not yet fixed together. This improves the stacking quality and decisively increases the reliability of the energy cell produced.

[0017] In the case of this process, the adhesive is applied particularly advantageously by means of a gravure printing method using a gravure printing roller. As described above, it is possible to apply the adhesive particularly well and clearly in the desired pattern.

[0018] It is particularly preferred to use an adhesive having a melting point of more than 20° C., in particular more than 30° C. Such an adhesive is solid at the usual process temperatures and therefore results in an immediate and firm fixation. The adhesive is heated before application. Therefore, the adhesive application device advantageously has a settable and adjustable heating device for the adhesive. "Melting point" in this case can be understood as the melting point of the adhesive, as long as it is a material with a clearly determinable melting point. However, many polymer adhesives do not have a clear melting point, but rather a melting interval. In the case of a melting interval, "melting point" refers to the lower limit of the melting interval.

[0019] The upper limit of the melting point is determined by the melting point of the separator material. The melting point of the adhesive (in the case of a melting range, the upper limit of the melting range) should always be below the melting point of the separator material. Therefore, the melting point of the adhesive is preferably at most 100° C., preferably at most 80° C., and particularly preferably at most 50° C.

[0020] The adhesive coating device may apply the adhesive continuously or intermittently.

[0021] In a particularly advantageous embodiment, the adhesive is soluble in the electrolyte used for the energy cell. In this case, the adhesive is not a foreign body on the electrode, which "passivates" a part of the electrode to a certain extent, that is, the entire electrode area can be used to generate energy because the electroactive surface is not reduced. Therefore, it does not matter which part of the electrode surface is covered with the adhesive. If the adhesive is insoluble in the electrolyte, it is particularly advantageous to only equip the smallest possible area of ​​the electrode with the adhesive. Therefore, the minimum application is always selected for the required fixing strength. If the adhesive is soluble in the electrolyte, the restriction of the lowest possible adhesive application is cancelled, and it is not necessary to work with the lowest possible adhesive application. On the contrary, the fixation can be improved by a larger amount of adhesive without worrying about the loss of energy cell performance.

[0022] Preferably, the adhesive is heated immediately before the adhesive is applied. For this purpose, a settable and adjustable heating device is assigned to the adhesive application system, in particular to the adhesive reservoir of the gravure printing roller.

[0023] The curing of the adhesive and thus the connection of the materials to be bonded is carried out by cooling the adhesive below its melting point. It is therefore also preferred that the adhesive is cooled below its melting point after application, wherein the cooling is carried out actively or passively. Depending on the melting point of the adhesive, the adhesive can be passively cooled sufficiently by free convection by a sufficiently long cooling section so that it becomes solid. If a faster curing of the adhesive is desired, the adhesive can also be actively cooled. For this purpose, the device has a cooling device for actively cooling the applied adhesive. The cooling device advantageously has a control device, by means of which the cooling process can be controlled.

[0024] There are many possibilities for applying the adhesive. Full-surface coating is possible. If, as described above, the adhesive is dissolved in the electrolyte, full-surface coating is preferred. Bonding can then be performed over the entire surface without affecting the performance of the energy cell. In another preferred embodiment, the adhesive is applied to the electrodes and / or separators on a partial surface. Other possibilities are to apply the adhesive in strips or spots. Particularly preferably, single points are applied at the four corners of the electrode sheets to be bonded or at corresponding points on the separator. Particularly preferably, the smallest possible amount of adhesive is applied, as this saves material in particular.

[0025] The adhesive can be applied to the web material in various ways:

[0026] In a preferred embodiment, the adhesive is applied continuously or intermittently to the separator film, and the electrodes are then placed and fixed. In particular, the fixing is carried out by cooling and thus curing the adhesive. In another preferred embodiment, the adhesive is applied continuously or intermittently to the electrode webs (anode web and cathode web) and brought together with the separator. In a third preferred embodiment, the adhesive is applied continuously or intermittently to the electrode segments, which are then brought together with the separator.

[0027] The device according to the invention advantageously has a control device for controlling the application of the adhesive. The control device can in particular control the application temperature and / or the amount of adhesive applied. The decisive parameters for the control are in particular the heat capacity, the thermal conductivity, the web speed of the anode web, the cathode web and the separator web, as well as the length of the cooling section and the cooling efficiency.

[0028] Particularly preferably, after the bonding there is a step of pressing the bonded materials together, in which the bonded materials are more strongly connected to each other. For this purpose, the device according to the invention preferably has a device for pressing the bonded materials. This pressing can be carried out contactlessly. This can preferably be done by setting the web tension of the continuous web of the separator or by a directional air flow. Therefore, in a preferred embodiment, the device according to the invention also has a control device for setting the web tension of the separator web and / or a device for introducing an air flow, the control device and / or the device being arranged in the process after the joining position of the adhesive coating device and the corresponding material. In another preferred embodiment, the device for pressing the bonded materials is constructed in a contact manner, in particular as a laminating roller, preferably made of rubber, which presses the bonded materials with a defined force, or as a soft brush, with which the pressing is achieved.

[0029] In another advantageous embodiment, the application is carried out by means of a transfer device, which can be designed in particular as a transfer roller. This method is used in particular if the electrode segments and / or separator segments are to be provided with adhesive. Even when applying to web-like materials, a transfer device can be used, but this is not absolutely necessary. On the contrary, in this case, the application can be carried out directly by means of a gravure printing roller.

[0030] If the energy battery is produced by first forming single cells and then stacking them to form an energy cell, it is particularly advantageous if the layers, i.e. all connections of the layers in the single cells as well as the connections of the single cells to one another, are made by means of adhesive connections. This ensures a uniform connection. In this case, it is particularly advantageous to use an adhesive which is dissolved in the electrolyte of the energy battery.

[0031] The invention makes it possible to produce energy cells without lamination. Thus, if all required connections of the layers to one another are made by means of adhesive bonding, lamination can be dispensed with entirely. Such a "lamination-free" method is particularly preferred, since it is more energy-efficient and also results in a uniform connection of all layers to one another. Furthermore, the lamination-free method according to the invention opens up greater variability in separator materials, for which lamination capability is no longer a prerequisite. Particularly preferably, a material with good wettability is used as separator according to the invention, with ceramic-coated separators being particularly preferred.

[0032] In principle, all solvent-free and non-aqueous adhesives with a melting point above 20° C. come into consideration as adhesives. In a particularly preferred embodiment, at least one compound selected from the group consisting of acrylates, methacrylates, SBS block copolymers, SIS block copolymers, polyurethanes, silicones, natural rubbers, synthetic rubbers, epoxy resins, polyolefin resins and vinyl carbonate is used as adhesive. In particular, the adhesive may be an adhesive. Vinyl carbonate is a cyclic ester with a melting point of 36° C. Vinyl carbonate is a common solvent and is used as an electrolyte in lithium-ion batteries. Due to its melting point, vinyl carbonate is particularly well suited as an adhesive for this application.

[0033] The dependent claims are directed to the mentioned and further suitable and advantageous embodiments of the invention. Only particularly suitable and advantageous construction modes and possibilities are described in more detail with the aid of the following description of the exemplary embodiment shown in the schematic diagram. Each described single design or detailed design within the exemplary embodiment is to be understood as a structurally independent detailed example for other embodiments and designs that are not described or not fully described and fall within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A section of a stacking station with two stacking devices is shown, in which adhesive application takes place.

[0035] Figure 2 An embodiment of a single cell manufacturing apparatus is shown in which an adhesive is applied to a separator. DETAILED DESCRIPTION

[0036] Figure 1A fragment of a stacking station 1 with two stacking devices is shown, which have an adhesive coating device 20, a conveying device 2, two transfer rollers 5 and a reversing roller 6 arranged between the transfer rollers 5. In addition, the stacking station includes two battery stacking devices 11, each of which has a removal device 111 and an associated storage device 112. The removal device 111 is designed as a rotating body in the form of a roller driven for rotational movement and has three connecting rods 113 oriented at an angle of 120 degrees to each other. The connecting rods 113 have an outer surface, which corresponds to the outer shape of the segment 16 in terms of its outer dimensions or can also be measured to be larger than the outer shape. The connecting rods 113 have an outer contour in the form of a circular arc segment in its cross section perpendicular to the rotation axis of the extraction device 111, which outer contours each have the same radius, so that the connecting rods complement each other to form a virtual circle. Furthermore, the removal device 111 with its take-over punch 113 is arranged and measured in radius so that, during the rotational movement, the removal device brings the outer surface of the transfer cylinder 5 into contact with the outer surface of the take-over punch 113 with a gap that corresponds at least to the thickness of the segment 16. Here, the rotational movement of the removal device 111 is controlled relative to the respective transfer cylinder 5 so that the take-over punch 113 takes over exactly one segment 16 from the transfer cylinder 5 during the rotation. To this end, the movement of the removal device 111 is controlled so that the outer surface of the take-over punch 113 has a circumferential speed corresponding to the circumferential speed of the segment 16 held on the transfer cylinder 5 at the point at the shortest distance from the transfer cylinder 5 (this point corresponds to the take-over point I), and in the ideal case, takes over the segment 16 from the take-over punch 113 without a relative speed in the circumferential direction.

[0037] A vacuum line is provided in the web of the take-over punch 113, which can be loaded with negative pressure and whose opening leads into the web and / or the end-side outer surface of the take-over punch 113. In addition, corresponding openings of the vacuum line, which can be loaded with negative pressure, can also be provided in the outer surface of the transfer cylinder 5. Then, the segment 16 is held at the outer surface of the transfer cylinder 5 by applying negative pressure in the vacuum line, and the segment 16 is taken over from the extraction device 111 by shutting off the negative pressure in the vacuum line of the transfer cylinder 5 and by connecting the negative pressure in the vacuum line of the take-over punch 113 passing through the take-over point I.

[0038] Separators alone or cells with separators may be considered as segments 16. In the case where the segments are cells, the stack is a cell stack.

[0039] The rotational movement of the extraction device 111 and thus the take-over punch 113 is controlled so that they take over the segments 16 from the transfer roller 5 in a predetermined sequence. In the present embodiment, two battery stacking devices 11 are provided so that each battery stacking device 11 takes over the segments 16 from the conveying device 2 in a fixed sequence in a double rhythm. Therefore, the first extraction device 111 of the first battery stacking device 11, which is assigned to the first transfer roller 5, takes over the first segments 13 of the two groups from the first transfer roller 5 in a rhythmic manner with its take-over punch 113 during rotation. Subsequently, the remaining segments of the two groups on the first transfer roller 5 are taken over from the first reversing roller 6 and further transferred to the second transfer roller 5. Then, the second battery stacking device 11 takes out the second segments 16 of the two groups from the second transfer roller 5 in the same manner as the take-over punch 113 of the second extraction device 111. Since each removal device 111 has three connection plugs 113 , the segments 16 are removed in groups of two of three from the connection plugs 113 being transported until all the segments 16 have been removed after being transferred by the second transfer drum 5 .

[0040] The extraction device 111 is arranged between the transfer drum 5 and the storage device 112 and takes over the segment 16 from the transfer drum 5 according to the above process. The extraction device 111 is driven into a counterclockwise rotational movement, as also according to Figure 1 This can be seen from the direction of the arrow in . During the period of taking over one of the segments 16 from the transfer drum 5, the taking over punch 113 of the extraction device 111 is located at the "12 o'clock position", and the taking over punch of the extraction device 111 passes the taking over point I. This position of the extraction device 111 with the taking over punch 113 arranged at the "12 o'clock position" is also referred to as the taking over position of the extraction device 111 in the sense of the present invention. The taking over punch 113 of the segments 16 of the previous four groups that have taken over the extraction drum 5 is located at the "8 o'clock position" in this position. In this taking over position, the extraction device 111 rotates at the circumferential speed of the outer surface of the taking over punch 113, which corresponds to the circumferential speed of the segments 16 on the transfer drum 5, and just one segment 16 is taken over by the taking over punch 113 arranged at the "12 o'clock position". The further take-over punch 113 is located in the “4 o'clock position”, which does not carry any segment 16 and therefore has a free outer surface, because it has just released the segment 16 into the storage device 112 .

[0041] The adhesive coating device 20 is also set at the "8 o'clock position". Figure 1In the embodiment of the present invention, the adhesive coating device is composed of a gravure roller 21, an adhesive storage container 22 and a transfer roller 23. The adhesive in the adhesive storage container 22 is heated to 40° C. by a heating device (not shown) and thereby liquefied. The gravure roller 21 has a cup-shaped depression so as to produce the desired adhesive pattern on the segment 16. The heated adhesive arrives in the corresponding cups of the gravure roller 21 from the adhesive storage container 22. These cups emit adhesive to the transfer roller 23 in a predetermined adhesive pattern. The transfer roller 23 is thereby synchronized with the extraction device 111 so that the transfer roller 23 has the same speed as the extraction device 111 in the "8 o'clock position". In this way, the adhesive pattern can be transferred from the transfer roller 23 to the segment 16 in the "8 o'clock position".

[0042] In order to transfer the segment 16 from the take-over punch 113 in the take-over position of the extraction device 111 located at the "8 o'clock position", the extraction device 111 continues to rotate until the take-over punch 113 of the extraction device 111 previously arranged at the "8 o'clock position" is arranged at the "6 o'clock position" and passes the transfer point II. Thus, the adhesive is applied at the "8 o'clock position" immediately before the stack is formed, which is formed after the transfer point II.

[0043] The transfer point II is the point of the shortest distance between the storage device 112 and the outer surface of the transfer-taking-over convex mold 113. Since the number of the transfer-taking-over convex molds 113 is an odd number, the transfer point II can be arranged in the "6 o'clock position" opposite to the transfer point I at the "12 o'clock position", and two of the transfer-taking-over convex molds 113 do not pass through the transfer point I and the transfer point II at the same time. The position of the extraction device 111 with the transfer-taking-over convex mold 113 arranged at the "6 o'clock position" is also referred to as the transfer position of the extraction device 111 in the sense of the present invention.

[0044] The extraction device 111 can be delayed during this rotational movement to such an extent that the extraction device 111 rotates at a lower peripheral speed in the transfer position in order to simplify the release of the segments 16. In the transfer position of the extraction device 111, the segments 16 are released from the receiving punch 113 arranged at the "6 o'clock position" to the storage device 112.

[0045] The storage device 112 has a receiving portion 115 and a scraper 117, which has a comb-like structure with a plurality of webs oriented parallel to one another, which are measured in width and arrangement so that when the extraction device 111 is rotated, the webs engage in the gaps between the webs of the connecting plug 113 of the extraction device 111 due to their position or by active movement, and the segments 16 held on the webs are passively and / or actively combed out of the connecting plug 113 in the transfer point II by their own movement and / or the movement of the extraction device. A battery stack is thus formed in the receiving portion 115, from which it is further transported and delivered to the completion of the energy cell.

[0046] Figure 2 An embodiment of a cell production device is shown in which an adhesive is applied to the separator. Anodes are transported on conveyor path A, cathodes on conveyor path B, and separator sheets are each transported as separator webs on conveyor paths C and D. First, a continuous web with cut cathode and anode segments is formed from anodes and cathodes.

[0047] The separator web 30 is conveyed on a conveying path C and guided around a deflection roller 31. The heated and thus liquefied adhesive is applied to the first surface of the separator web 30 by an adhesive application device 21a designed as a gravure roller. The gravure roller 21a has cup-shaped depressions arranged in a pattern corresponding to the desired adhesive pattern. The adhesive is applied to the separator web 30 in repeated sections by the gravure roller 21a in the desired adhesive pattern.

[0048] Anodes are transported on a conveying path A, and are separated into anode segments 50 by means of a cutting roller 52. The anode segments 50 are conveyed to the separator web 30 via an anode distribution roller 51 and are arranged on the separator web according to an adhesive pattern in the process. The gravure printing roller 21a is synchronized with the anode conveying path A by a control device (not shown) so that the anode segments 50 are arranged on the separator web 30 at the desired points provided with adhesive. When the anode segments are applied to the separator web 30 provided with adhesive, the separator web passes through a cooling device 80, in which the adhesive is cooled and solidified, so that the anode segments 50 are fixed on the separator web 30.

[0049] In a similar manner, the separator web 40 is conveyed on the conveying path D and guided around the deflection roller 41. The heated and thus liquefied adhesive is applied to the first surface of the separator web 40 by the adhesive coating device 21b configured as a gravure printing roller. The adhesive is the same adhesive that is also applied to the separator web 30. The gravure printing roller 21b has a depression in the shape of a cup, and the depression is arranged in a pattern corresponding to a desired adhesive pattern. The adhesive pattern can be the same as the adhesive pattern for the separator web 30, but it can also be different therefrom. The adhesive is applied to the separator web 40 in repeated sections by the gravure printing roller 21b with the desired adhesive pattern.

[0050] The cathode is transported on the conveying path B and is separated into cathode segments 60 by means of a cutting roller 62. The cathode segments 60 are conveyed to the separator web 40 via the cathode distribution roller 61 and are arranged on the separator web according to the adhesive pattern in the process. The gravure printing roller 21b is synchronized with the cathode conveying path B by a control device (not shown) so that the cathode segments 60 are arranged on the separator web 40 at the desired points provided with adhesive. When the anode segments are applied to the separator web 30 provided with adhesive, the separator web passes through a cooling device 81, in which the adhesive is cooled and solidified, so that the cathode segments 60 are fixed on the separator web 40.

[0051] Another adhesive coating device 21c, which is configured as a gravure printing roller, is located in the further extension of the separator web 30, and the other adhesive coating device applies the heated and liquefied adhesive again, and applies it to the second surface of the separator web 30. At the press roller 90, the two separator webs, namely the separator web 40 with the cathode segment 60 and the separator web 30 with the anode segment 50, meet each other. The second surface of the separator web 30 provided with adhesive is placed on the cathode segment 60 located on the surface of the second separator web 40, and the centers of the anode segment and the cathode segment 50, 60 are respectively overlapped. The separator web 30 is fixed to the cathode segment by the adhesive, and a single cell web composed of two separator webs 30, 40, the anode segment 50 and the cathode segment 60 is formed. The single cell web is cut into finished single cells by a cutting device (not shown).

Claims

1. A method for producing a stacked energy cell having a plurality of separators and a plurality of electrodes arranged between the separators, i.e. alternatingly arranged anodes and cathodes, wherein at least one electrode is fixed to at least one of the separators by means of an adhesive connection, characterized in that: The adhesive for the at least one adhesive connection is applied by a gravure printing method.

2. The method according to claim 1, characterized in that Anodes are transported on conveying path A, cathodes are transported on conveying path B, and separators are transported on conveying paths C and D respectively as separator webs (30, 40), a continuous web with cut cathode and anode segments (50, 60) is first formed from the two separator webs (30, 40) and the anodes and cathodes, wherein all connections between separators and electrodes are formed by means of adhesive connections, and in a further step the continuous web is separated into individual cells.

3. A method for producing a stacked energy cell, in particular according to claim 1 or 2, wherein the stacked energy cell has a plurality of separators and a plurality of electrodes arranged between the separators, i.e. anodes and cathodes arranged alternately, wherein at least one electrode is fixed to at least one of the separators by means of an adhesive connection, characterized in that The stacked energy battery is formed by stacking a plurality of single cells, wherein the single cells are fixed one on top of the other by means of an adhesive connection.

4. A method for producing a stacked energy cell, in particular according to claim 1, comprising a plurality of separators and a plurality of electrodes arranged between the separators, i.e. anodes and cathodes arranged alternately, wherein at least one electrode is fixed to at least one of the separators by means of an adhesive connection, characterized in that The stack-type energy battery is formed by alternately stacking separators and electrodes, wherein adhesive coating is performed immediately before forming the stack.

5. The method according to one or more of claims 1 to 4, characterized in that The adhesive has a melting point above 20°C, in particular above 30°C.

6. The method according to one or more of claims 1 to 5, characterized in that The binder is soluble in an electrolyte used in the energy cell.

7. The method according to one or more of claims 1 to 6, characterized in that The adhesive is heated immediately prior to application of the adhesive.

8. The method according to one or more of claims 1 to 7, characterized in that After application, the adhesive is cooled, wherein the cooling can be performed actively or passively.

9. The method according to one or more of claims 1 to 8, characterized in that The application is carried out with the aid of a transfer roller (23).

10. The method according to one or more of claims 1 to 9, characterized in that The adhesive is applied to the separator, the electrode, or the separator and the electrode over the entire surface, over a portion of the surface, or at points.

11. The method according to one or more of claims 1 to 10, characterized in that The bonding is followed by a step of pressing the bonded materials together.

12. The method according to one or more of claims 1 to 11, characterized in that The stacked energy battery is manufactured in a non-lamination manner.

13. The method according to one or more of claims 1 to 12, characterized in that As binder, at least one compound from the group consisting of acrylates, methacrylates, SBS block copolymers, SIS block copolymers, polyurethanes, silicones, natural rubbers, synthetic rubbers, epoxy resins, polyolefin resins and vinyl carbonate is used.

14. A device for manufacturing a stacked energy battery, the stacked energy battery having a plurality of separators and a plurality of electrodes arranged between the separators, namely anodes and cathodes arranged alternately, wherein The separator and the electrode are delivered individually or in the form of a prefabricated composite unit consisting of at least two components for forming a stack, comprising a stacking station (1) in which the stack is formed from individual components and the prefabricated composite unit, comprising at least one adhesive application device (20) which is constructed and arranged to apply adhesive to at least one of the conveyed components, It is characterized in that The at least one adhesive application device (20) is a gravure printing roller (21).

15. The device according to claim 14, characterized in that The device has a conveying path A for anodes, a conveying path B for cathodes, and conveying paths C and D for separator webs (30, 40) respectively, and also has an anode positioning device (51) and a cathode positioning device (61), wherein the anode positioning device places the anode on one separator web (30) for manufacturing an anode-separator composite unit, and the cathode positioning device places the cathode on another separator web (30) for manufacturing a cathode-separator composite unit. An adhesive coating device (20, 21a, 21b) is assigned to at least one of the anode positioning device (51) and the cathode positioning device (61) for applying adhesive to electrodes and / or in particular separators, and the adhesive coating device is constructed as a gravure printing roller (21, 21a, 21b).

16. The device according to claim 15, characterized in that The device further comprises a cell production device for producing cells from the anode-separator composite unit and the cathode-separator composite unit, and an adhesive coating device (20) is assigned to the cell production device, which is configured as a gravure printing roller (21c).

17. A device for producing a stacked energy cell, in particular according to at least one of claims 14 to 16, comprising a plurality of separators and a plurality of electrodes arranged between the separators, namely alternating anodes and cathodes, wherein The separator and the electrode are delivered individually or in the form of a prefabricated composite unit consisting of at least two components for forming a stack, comprising a stacking station (1) in which the stack is formed from individual components and the prefabricated composite unit, comprising at least one adhesive application device (21) which is constructed and arranged to apply adhesive to at least one of the conveyed components, It is characterized in that The device has a single cell stacking device for stacking a plurality of single cells to form the stacked energy battery, wherein the adhesive coating device (20) is assigned to the stacking device (1).

18. A device for producing a stacked energy cell, in particular according to claim 14, having a plurality of separators and a plurality of electrodes arranged between the separators, namely alternating anodes and cathodes, wherein The separator and the electrode are delivered individually or in the form of a prefabricated composite unit consisting of at least two components for forming a stack, comprising a stacking station (1) in which the stack is formed from individual components and the prefabricated composite unit, comprising at least one adhesive application device (20) which is constructed and arranged to apply adhesive to at least one of the conveyed components, It is characterized in that The apparatus has a stacking device (11) for forming a stacked energy cell by alternately stacking separators and electrodes, wherein the adhesive coating device (20) is assigned to the stacking device (11).

19. The device according to claim 17 or 18, characterized in that The adhesive application device (20) assigned to the cell stack or the stacking device (11) is designed as a gravure printing roller (21).

20. Device according to one or more of claims 17 to 19, characterized in that The stacking device (11) or the single cell stacking device has an acceleration roller (111), and the adhesive application device (20) is assigned to the acceleration roller (111).

21. The device according to at least one of claims 14 to 20, characterized in that The device also has one or more transfer rollers (23) assigned to one or more gravure printing rollers (21).

22. The device according to at least one of claims 14 to 21, characterized in that The device has a cooling device (80) for cooling the applied adhesive.

23. The device according to claim 22, characterized in that The device has a control device for the cooling device (80).

24. The device according to claim 22 or 23, characterized in that The device has a heating device for heating and liquefying the cooled adhesive.

25. The device according to claim 24, characterized in that The device has a control device for the heating device.

26. The device according to at least one of claims 14 to 25, characterized in that The device has a control device for controlling the application of adhesive.

27. The device according to at least one of claims 14 to 26, characterized in that The device has a device for pressing (90) the bonded materials.

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