Method for coating an electrically conductive web of film with an electrically conductive adhesion promoter

Abstract

The invention relates to a method for coating an electrically conductive web of film (210) with an electrically conductive adhesive (1), characterized in that the method comprises the steps of providing an electrically conductive web of film (210) and of coating the web of film (210) with an electrically conductive adhesive (1).

Description

[0001] Process for coating an electrically conductive film web with an electrically conductive adhesion promoter

[0002] The invention relates to a method for coating an electrically conductive film web with an electrically conductive adhesion promoter.

[0003] For the application of decorative structural elements to web-like substrates, for example in the production of textured wallpaper, it is known to apply expandable materials, for example, polyurethane-based, to the substrate using a doctor blade through a screen roller. Such methods are known, for example, from JP 05262509 B2 and EP 2322711 B1. These known methods have the disadvantage that the applied materials must first be dried and / or cured after application before the coated web can be further processed, even if it is only to be wound up for transport.

[0004] In the production of electrodes for electrical energy storage devices, the film web coated with an electrically conductive adhesion promoter for providing the current collector is bonded to a pre-calendered dry electrode film in a multi-roll calender. For this purpose, the dry electrode film and the film web with their adhesion promoter are introduced into a roll nip facing the dry electrode film, whereby the dry electrode film is electrically conductively bonded to the film web via the adhesion promoter and further compacted. Such a calendering process is described in WO 2020 / 150254 A1.

[0005] It is the object of the invention to further develop the method mentioned at the outset in such a way that it enables the further processing of the film web coated with an electrically conductive adhesion promoter, in particular in a calendering process for dry electrode production, immediately after the coating of the film web.

[0006] This object is achieved by a method having the features of claim 1. Advantageous embodiments are the subject of the respective dependent claims. The invention relates to a method for coating an electrically conductive film web with an electrically conductive adhesive, characterized in that the method comprises providing an electrically conductive film web and printing the film web with an electrically conductive adhesive.

[0007] The method according to the invention makes it possible, in particular, to coat the electrically conductive film web with the adhesion promoter in situ during the calendering process for dry electrode film production. For example, in a modification of the prior art, the conductive film web coated with the adhesion promoter can be introduced into the nip of the calender from an unwinding reel, but can be coated immediately before the film web is introduced into the nip and can be introduced into the nip as a coated film web. If necessary, the adhesion promoter on the coated film web has not yet cured or has not yet completely dried when it is introduced into the nip, whereby the adhesion of the dry electrode film to the film web can be further increased. In particular, the calendering process can include further drying or curing steps.Curing steps that cure, dry, or crosslink the adhesion promoter to a final strength. For this purpose, the multi-roll calender used in the calendering process can have at least one heated roll. The heated roll is preferably one of the rolls forming the nip, into which the film web printed with the adhesion promoter is introduced after printing to be bonded to the dry electrode film.

[0008] The adhesive can be provided as a liquid adhesive with a solvent that is volatile under normal conditions. "Normal condition" can mean ambient pressure and / or ambient temperature. "Normal condition" can mean room pressure and / or room temperature, e.g., a pressure of approximately 1 bar and / or a temperature of approximately 20°C.

[0009] The method may comprise drying and / or curing the electrically conductive adhesive after printing the film web with the electrically conductive adhesive.

[0010] The printing of the electrically conductive film web can be carried out using a gravure printing process and / or a flexographic printing process. During printing, the electrically conductive film web to be printed can be passed through a nip between a printing form cylinder and an impression cylinder. The printing form cylinder and / or the impression cylinder can be configured to apply adhesive to the film web.

[0011] The electrically conductive adhesive printed on the electrically conductive film web can be cured after printing. It may be provided that the electrically conductive adhesive printed on the electrically conductive film web can be dried and / or tempered and / or crosslinked after printing.

[0012] The film web printed with the electrically conductive adhesive can, optionally after a curing step, be wound up or fed directly into a calendering unit for the production of a dry electrode. The calendering unit can be or comprise a multi-roll calendering unit and / or a multi-roll calender. The calendering unit can be or be configured and / or used, for example, for the production of a dry electrode, e.g., a lithium-ion electrode.

[0013] The method may comprise tempering the electrically conductive adhesive before coating the adhesive onto the electrically conductive film web. The method may comprise a tempering of an adhesive before coating the adhesive onto the electrically conductive film web.

[0014] The electrically conductive adhesive can be introduced into a plurality of cells of a printing form cylinder for coating. At least one, several, or all cells can be or have an engraving. At least one, several, or all cells and / or engraving can extend into the printing form cylinder and / or be or have a recess. The cells and / or engraving can be groove-shaped and / or have grooves.

[0015] The coated electrically conductive film web can be subjected to a second nip of a

[0016] Multi-roll calender, wherein the second roll nip can receive the film web. The second roll nip can laminate the coated electrically conductive film web to a first dry electrode film and a second dry electrode film to form a double-sided dry electrode. The second roll nip can laminate a first dry electrode film and a second dry electrode film to the film web, in particular the coated electrically conductive film web, to form a double-sided dry electrode. The first dry electrode film and / or the second dry electrode film can be or become laminated and / or applied to the coated electrically conductive film web, and / or be or become connected to the coated electrically conductive film web.

[0017] The method may comprise the steps of: a. providing a first dry electrode material with a first dry electrode material supply system; b. forming a first nip between a first and a second calender roll; c. calendering a first dry electrode film from the first dry electrode material in the first nip.

[0018] The method may comprise forming a second nip between a third calender roll and a further calender roll, wherein the first dry electrode film can be transferred into the second nip after leaving the first nip. The further calender roll can be arranged upstream of the third calender roll. It can be provided that the further calender roll can be the second calender roll or can correspond to it. "Upstream" can mean that the first dry electrode film is or will be guided to, into, or through the first nip before the first dry electrode film is or will be guided to, into, or through the second nip.

[0019] It can be provided that the calendering of the first dry electrode film made of the first dry electrode material is carried out in the first nip at a rotational speed of the second calender roll that can be greater than the rotational speed of the first calender roll. The third calender roll can be operated at a rotational speed that can be greater than the rotational speed of the further calender roll. The third calender roll can be operated at a rotational speed that can be greater than the rotational speed of the second calender roll.

[0020] The method may comprise the steps of: a. forming a third nip between a fourth calender roll and a yet further calender roll, b. receiving the second dry electrode material from the second dry electrode material supply system in the third nip, and c. forming a second dry electrode film in the third nip.

[0021] The yet further calender roll may be the third calender roll or correspond to it. The yet further calender roll and / or the third calender roll may be arranged adjacent to and / or downstream of the fourth calender roll. "Downstream" may mean that the second dry electrode film is or will be guided to, into, or through the third nip before the second dry electrode film is or will be guided to, into, or through the second nip.

[0022] The second dry electrode film can be or be calendered in the third nip. It can be provided that the second dry electrode film can be or be formed and / or calendered in the third nip at a rotational speed of the third calender roll and / or the yet further calender roll that can be greater than the rotational speed of the fourth calender roll.

[0023] The method may comprise introducing the printed conductive film web into the second nip, wherein the printed conductive film web may be laminated with the first dry electrode film and the second dry electrode film, thereby obtaining a double-sided dry electrode. The printed conductive film web may be introduced into the second nip immediately after printing, wherein the film web may be introduced into the second nip either after complete drying and / or curing or at least before complete drying and / or curing.

[0024] The printing of the film web can be carried out in-situ by feeding the electrically conductive film web to the second nip of the multi-roll calender.

[0025] The printed conductive film web can be cured, dried and / or crosslinked in the multi-roll calender after being introduced into the second roll nip.

[0026] The film web can be heated for curing, drying, or crosslinking. In some embodiments, the film web and / or the adhesive can be heated for curing, drying, or crosslinking by heating the coated film web with the first and / or second dry electrode film over a heated roll of the multi-roll calender. The multi-roll calender can have at least one heated roll. It can be provided that one, several, or all of the calender rolls, for example, the first calender roll, the second calender roll, the third calender roll, the fourth calender roll, the further calender roll, and / or the yet further calender roll, can be or can be heated.

[0027] Further details of the invention are explained with reference to the following figures.

[0028] Figure 1 shows an exemplary embodiment of a multi-roll calender according to the prior art;

[0029] Figure 2 shows a multi-roll calender using an embodiment of the method according to the invention; and

[0030] Figure 3 shows a multi-roll calender using a further embodiment of the method according to the invention. Fig. 1 shows a multi-roll calender 100 with which two dry electrode films can be produced and laminated onto a current collector 10 to form a double-sided electrode. The multi-roll calender 100 can have more than one roll, e.g. four rolls 4, 5, 6, 7. The current collector 10 can be or have a film web 10 coated with an adhesive 1. The film web 10 coated with an adhesive 1 can also be referred to as a current collector 10. The film web 10 coated with adhesive 1 can, for example, be or have a film web 10 printed with adhesive 1.

[0031] Fig. 1 shows two feed systems 2 and 3 for dry electrode material, and four rollers 4, 5, 6 and 7. An adhesive-coated current collector 10 can be provided from a pay-off reel 8. A first dry electrode film 20 can be formed by calendering particles, e.g. particulate dry electrode material 22, from the feed system 2 through a first gap 13 between the rollers 4 and 5. A second dry electrode film 21 can be formed by calendering particles, e.g. particulate dry electrode material 22, from the feed system 3 through a third gap 14 formed between the rollers 6 and 7. Both dry electrode films 20 and 21 can be laminated to a first or second opposite side of the adhesive-coated film web 10 and / or to a first or second opposite side of the current collector 10.The lamination can be carried out by compressing, in particular calendering, the dry electrode films 20 and 21 and the adhesive-coated film web 10, and / or the current collector 10, between a second gap 11 formed between the rollers 5 and 6. In addition to lamination, this second gap 11 can also enable additional calendering to determine the film thickness of the dry electrode films 20 and 21. After lamination between the rollers 5 and 6, the double-sided electrode 110 is collected for further processing, e.g., via a take-up reel 9. The electrode 110 can be or comprise a dry electrode. The dry electrode 110 can be or comprise a lithium-ion electrode and / or be formed and / or used in or for the production of a lithium-ion electrode. The electrode 110 and / or the dry electrode 110 may be or comprise a double-sided electrode and / or a double-sided dry electrode.

[0032] When applying and / or laminating the first dry electrode film 20 to the film web 10, the first dry electrode film 20 can be glued to the film web 10 and / or glued to the film web 10, for example via or by means of adhesive 1 applied to the film web 10. When applying and / or laminating the second dry electrode film 21 to the film web 10, the second dry electrode film 21 can be glued to the film web 10 and / or glued to the film web 10, for example via or by means of adhesive 1 applied to the film web 10.

[0033] The first dry electrode film 20 can be or will be calendered, for example by the roller pair 4, 5 and / or a first roller 4 and a second roller 5. The multi-roll calender 100 can have the roller pair 4, 5 or the first roller 4 and the second roller 5. The roller 4 and / or the roller 5 can be or have a calender roller. In some embodiments, it can be provided that one of the rollers 4, 5 of the roller pair can have a higher rotation speed than the other roller of the roller pair. For example, the rotation speed of the second roller 5 can be greater than the rotation speed of the first roller 4, and / or the second roller 5 can rotate at a higher speed than the first roller 4.In some embodiments, however, it may also be provided that the rotational speed of the first roller 4 may be greater than the rotational speed of the second roller 5, and / or that the first roller 4 may rotate at a higher speed than the second roller 5. In some embodiments, however, the two rollers 4, 5 may also have the same rotational speed and / or rotate at the same speed.

[0034] The first dry electrode film 20 can be produced in a first gap 13, which can be formed by the roller pair 4, 5 and / or the roller 4 and the roller 5. For example, dry electrode material 22 can be introduced into the first gap 13. In the first gap 13, the dry electrode material 22 can be calendered, pressed, and / or compressed to form the first dry electrode film 20.

[0035] The second dry electrode film 21 can be or will be calendered, for example by the roller pair 6, 7 and / or a third roller 6 and a fourth roller 7. The multi-roll calender 100 can have the roller pair 6, 7 or the third roller 6 and the fourth roller 7. The roller 6 and / or the roller 7 can be or will be a calender roller. In some embodiments, it can be provided that one of the rollers 6, 7 of the roller pair can have a higher rotation speed than the other roller of the roller pair. For example, the rotation speed of the fourth roller 7 can be greater than the rotation speed of the third roller 6, and / or the fourth roller 7 can rotate at a higher speed than the third roller 6.In some embodiments, however, it may also be provided that the rotational speed of the third roller 6 may be greater than the rotational speed of the fourth roller 7, and / or that the third roller 6 may rotate at a higher speed than the fourth roller 7. In some embodiments, however, the two rollers 6, 7 may also have the same rotational speed and / or rotate at the same speed.

[0036] Alternatively or additionally, it can be provided that the second roller 5 and the third roller 6 can have a different rotation speed and / or rotate at a different rotation speed. It can be provided that the rotation speed of the second roller 5 can be higher than that of the third roller 6, and / or the second roller 5 can rotate at a rotation speed that can be greater than that of the third roller 6. It can be provided that the rotation speed of the third roller 6 can be higher than that of the second roller 5, and / or the third roller 6 can rotate at a rotation speed that can be greater than that of the second roller 5. In some embodiments, however, the second roller 5 and the third roller 6 can also have the same rotation speed and / or rotate at the same rotation speed.

[0037] It can be provided that the rotational speeds of one, several, or all rollers, in particular the first roller 4, the second roller 5, the third roller 6, and / or the fourth roller 7, can be individually selected, controlled, and / or regulated. The rotational speeds of one, several, or all rollers, in particular the first roller 4, the second roller 5, the third roller 6, and / or the fourth roller 7, can be selected and / or adjusted depending on the type, material, and / or composition of the dry electrode material 22, the first dry electrode film 21, the second dry electrode film 22, the adhesive 1, and / or the film web 210, and / or the film web 10.

[0038] The second dry electrode film 21 can be or will be produced in a third gap 14, which can be formed by the roller pair 4, 5 and / or the roller 4 and the roller 5.

[0039] For example, dry electrode material 22 can be introduced into the first gap 13. In the third gap 14, the dry electrode material 22 can be calendered, pressed, and / or compressed to form the first dry electrode film 20.

[0040] It can be provided that the second roller 5 and the third roller 6 form a roller pair 5, 6. The multi-roll calender 100 can have the roller pair 5, 6 or the second roller 5 and the third roller 6. The roller 6 and / or the roller 7 can be or have a calender roller. The roller pair 5, 6 can serve to laminate the first dry electrode film 20 and / or the second dry electrode film 21 onto the film web 10. A second gap 11 can be formed between the rollers 5, 6. The rollers 5, 6 and / or the roller pair 5, 6 can form a second gap 11. The film web 10 can be introduced into the second gap 11 and / or guided through the second gap 11.

[0041] The first dry electrode film 20 can be introduced into the second gap 11 between the rollers 5, 6 and / or the gap 11 of the roller pair 5, 6, and / or passed through the second gap 11. The second dry electrode film 21 can be introduced into the second gap 11 between the rollers 5, 6 and / or the gap 11 of the roller pair 5, 6, and / or passed through the second gap 11. The film web 10, the first dry electrode film 20, and / or the second dry electrode film 21 can be guided into the second gap 11 such that the first dry electrode film 20 can be applied and / or laminated on one side of the film web 10, and the second dry electrode film 21 can be applied and / or laminated on an opposite side of the film web 10.

[0042] In some embodiments, the roller pair 4, 5 can be arranged opposite the roller pair 6, 7. In some embodiments, the roller pair 4, 5 can be arranged on one side of the film web 10, and the roller pair 6, 7 can be arranged on another and / or opposite side of the film web 10. The first roller 4 can be arranged substantially next to the second roller 5, and / or vice versa. The third roller 6 can be arranged substantially next to the fourth roller 7, and / or vice versa. The second roller 5 can be arranged substantially next to the third roller 6, and / or vice versa.

[0043] It can be provided that the second roller 5 can be part of the roller pair 4, 5 that can form the first dry electrode film 20, as well as part of the roller pair 5, 6 that can apply and / or laminate the first dry electrode film 20 to the film web 10. It can be provided that the third roller 6 can be part of the roller pair 6, 7 that can form the second dry electrode film 21, as well as part of the roller pair 5, 6 that can apply and / or laminate the second dry electrode film 21 to the film web 10.

[0044] In some embodiments, the second roller 5 can be arranged upstream of the third roller 6. "Upstream" can mean a direction opposite to the transport or conveying direction of the first dry film 20. The first dry film 20 can first be guided through the first nip 13 and then through the second nip 11, and / or at least first contact the roller 5 at, in, or near the first nip 13 and then at, in, or near the second nip 11. In some embodiments, the third roller 6 can be arranged downstream of the fourth roller 7. "Downstream" can mean a direction in the transport or conveying direction of the second dry film 21. The second dry film 21 can first be guided through the third nip 13 and then through the second nip 11, and / or at least first contact the roller 6 at, in, or near the third nip 14 and then at, in, or near the second nip 11.

[0045] The multi-roll calender 100 according to the invention shown in Figure 2 and / or described below can have one, several or all features and / or advantages of the multi-roll calender 100 shown in Figure 1 and / or 3 and described above and / or below.

[0046] The printing of the film web 210 with adhesive 1 and / or the application of adhesive 1 to the film web 210 can be carried out and / or performed using a flexographic printing process. Using the flexographic printing process, adhesive 1 can be applied and / or printed onto the film web 210 not yet provided with adhesive, in order to obtain the film web 10 printed and / or provided with adhesive 1.

[0047] Due to the described arrangement of the rollers, e.g. the first roller 4, second roller 5, third roller 6 and / or fourth roller 7, the roller calender 100 can be designed to save space and / or require a small installation area.

[0048] In one embodiment of the invention, in contrast to the multi-roll calender 100 shown in Fig. 1, the multi-roll calender 100 shown by way of example in Fig. 2 has, instead of the unwinding reel 8 for the adhesive-coated film web 10 or for the current collector 10, a flexographic printing unit 200 with which an uncoated, electrically conductive film 210, for example an aluminum foil, is printed on both sides with an adhesive 1 in order to form a film web 10 coated with adhesive 1 and / or the current collector 10. Liquid adhesive 1 is fed to a chambered doctor blade 202 via a feed line 201. The liquid adhesive 1 is applied to a structured anilox roller 203 via the chambered doctor blade 202 and transferred from the anilox roller 203 to a printing forme cylinder 204. The adhesive-free film web 210 is drawn off from a supply reel 205 and introduced around a nip 12 between the printing form cylinder 204 and a second printing form cylinder 204.When the adhesive 1 has been transferred from the printing form cylinder 204 to the film web 210, the printed film web 210 is fed as a current collector 10 and / or as a film web 10 coated with adhesive 1 in the manner described with reference to Figure 1 into the second nip 11 of the multi-roll calender 100 in order to be connected on both sides to a calendered dry electrode film 20, 21.

[0049] Further deviating from the prior art, the adhesive 1 may not yet be (fully) cured, dried, and / or crosslinked when the current collector 10 is introduced into the multi-roll calender 100 and / or the second nip 11, and may therefore still be liquid or viscous, or have reduced strength. Accordingly, the further drying, curing, and / or crosslinking of the adhesive 1 occurs either during the bonding of the film web 210 coated with the adhesive 1 to the dry electrode films 20, 21, or in a subsequent calendering step, in which the dry electrode films 20, 21 arranged on opposite sides are further compressed to a final thickness or density, or during transport of the current collector 10 coated with the dry electrode films 20, 21 in the multi-roll mill 100, wherein the coated current collector 10 rests against the shell of a heated roller.

[0050] The printing of the film web 210 with adhesive 1 and / or the application of adhesive 1 to the film web 210 can be carried out and / or performed using a gravure printing process. Using the gravure printing process, adhesive 1 can be applied and / or printed onto the film web 210 not yet provided with adhesive, in order to obtain the film web 10 printed and / or provided with adhesive 1.

[0051] The multi-roll calender 100 according to the invention shown in Figure 3 and / or described below can have one, several or all features and / or advantages of the multi-roll calender 100 shown in Figure 1 and / or Figure 2 and described above and / or below.

[0052] In one embodiment of the invention, in a modification of the embodiment shown in Figure 2, as shown by way of example in Figure 3, a gravure printing unit 300 is used for printing the film web 210 with the adhesive 1. The adhesive 1 is held in a trough 350 into which a horizontal forme cylinder 320 projects via its underside. The forme cylinder 320 has a cell engraving 330 for receiving the adhesive 1. The cell engraving 330 can also be referred to as a cell 330. The cell 330 can have an engraving that can extend into the forme cylinder 320. The cell(s) 330, or the engraving, can have a pattern that can enable and / or promote the entrainment and / or capture of adhesive 1 from the trough 330. The cup(s) 330, or the engraving, may comprise grooves and / or depressions.

[0053] On the side of the cylinder jacket facing away from the trough 350 in the direction of rotation, there is a doctor blade 340 which removes excess adhesive 1 so that the adhesive 1 remains only in the cells 330. On an upper side of the forme cylinder 320 facing away from the doctor blade 340 in the direction of rotation of the forme cylinder 320, a roller gap 12 to a second forme cylinder 320 is formed. The first forme cylinder 320 and / or the second forme cylinder 320 can be or comprise a printing forme cylinder and / or an impression forme cylinder. The first forme cylinder 320 can be or comprise a printing forme cylinder and the second forme cylinder 320 can be or comprise an impression cylinder. The first forme cylinder 320 can be or comprise an impression cylinder and the second forme cylinder 320 can be or comprise a printing forme cylinder.

[0054] The film web 210 to be coated is passed through the roller nip 12. The contact pressure of the forme cylinder 320 and the second forme cylinder 320 is so high that the film web 210 to be coated comes into contact with the adhesive 1 in the cups 330 in the roller nip 12, and the adhesive 1 is transferred from the forme cylinder 320 to the film web 210.

[0055] The film web 10, 210 can be electrically conductive. The film web 210 not yet printed with adhesive 1 and / or the film web 10 printed with adhesive 1 can serve as a current collector and / or current collector for one or the electrode 110.

[0056] In some embodiments, the adhesive 1 can be applied to the film web 210 in spots or sections. It can be provided that during the application and / or lamination of the dry film 20, 21 and / or gluing of the dry film 20, 21, the adhesive applied in spots or sections can be distributed along the film web 10.

[0057] In some embodiments, the adhesive 1 can be applied to the film web 210 continuously and / or at least in webs or strips running along the conveying direction of the film web 210.

[0058] The adhesive 1 can be electrically conductive. The adhesive 1 can be liquid and provided with a solvent that is volatile under normal conditions. Normal conditions can be, for example, room temperature, e.g., 20°C, and / or at a pressure of approximately 1 bar. It can be provided that the adhesive 1, in particular electrically conductive adhesive 1, can be tempered before coating. The adhesive 1, in particular electrically conductive adhesive 1, can be tempered before coating, applying, and / or laminating the film web 10. In some embodiments, the adhesive 1 can, for example, be tempered and / or warmed or heated to a temperature such that it can have a viscosity at which it can, for example, be easily applied to the film web 10 and / or carried along by the rollers or cylinders 204, 320, and / or cells 330.Depending on the type and / or composition of the adhesive 1, the adhesive 1 can be or will be tempered at different temperatures. The tempering and / or temperature can be selected and / or carried out depending on the type, material, and / or composition of the adhesive 1. A corresponding device can be provided for the tempering, for example, a tempering and / or heating device that can temper the adhesive 1.

[0059] In some embodiments, the film web 10 printed with the electrically conductive adhesive 1 can be wound up, e.g. on or with a take-up roll 9 (not shown in the figures). It can be provided that the film web 10 printed with the electrically conductive adhesive 1 and wound up on the take-up roll 9 is fed to a multi-calender 100, as described, for example, with reference to Figure 1, so that an electrode 110, in particular a dry electrode 110, can be produced. It can be provided that the take-up roll 9 can serve as a pay-off reel 8 or can correspond to a pay-off reel 8 that can provide the film web 10 coated with the adhesive 1.

[0060] It can be provided that the electrically conductive adhesive 1 printed on the electrically conductive film web 10 can be cured after printing, e.g., dried, tempered, and / or crosslinked. A corresponding device can be provided for this purpose, for example, a heating device or the like. In some embodiments, the printed and cured film web 10 can be wound up, e.g., on or with a winding roll 9 (not shown in the figures).

[0061] Alternatively or additionally, the printed film web 10 can be or will be fed to the multi-roll calender 100. In some embodiments, the film web 10 or the adhesive 1 can be cured. In some embodiments, the film web 10 or the adhesive 1 can be at least partially cured. In some embodiments, the adhesive 1 applied to the film web 10 can be at least partially or completely liquid. In some embodiments, it can be provided that the cured adhesive 1 can be at least partially liquefied and / or the curing can be at least partially reversed before the film web 10 is laminated to the first dry electrode film 20 and / or the second dry electrode film 21. In some other embodiments, however, it can also be provided that the first dry electrode film 20 and / or the second dry electrode film 21 is applied to or with the cured adhesive 1 orFilm web 10 can be laminated.

[0062] Alternatively or additionally, it may be provided that the film web 10 coated with adhesive 1 and / or printed can be guided and / or fed into the second nip 11 and / or the multi-roll calender 100 immediately after printing. The film web 10 coated with adhesive 1 and / or printed can be laminated and / or bonded to the first dry electrode film 20 and / or the second dry electrode film 21 immediately after printing.

[0063] The printing of the film web 210 can be performed in-situ by feeding the electrically conductive film web 10 to or into the multi-roll calender 100 and / or the second nip 11. In some embodiments, the film web 210 not yet printed with adhesive 1 can be introduced into the multi-roll calender 100 and / or the second nip 11, and the adhesive 1 can be applied and / or printed substantially at or in the nip 11. It can be provided that the adhesive 1 can be printed and / or applied to the film web substantially immediately and / or only shortly before the lamination of the first dry electrode film 21 and / or the second dry electrode film 21.

[0064] Alternatively or additionally, in some embodiments, the adhesive 1 and / or the film web 10 can be cured, dried, and / or crosslinked only after introduction into the multi-roll calender 100 and / or the second nip 11. It can be provided that the adhesive 1 and / or the film web 10 can be cured, dried, and / or crosslinked only after application of the first dry electrode film 20 and / or the second dry electrode film 21 to the film web 10, and / or at least after contacting of the first dry electrode film 20 and / or the second dry electrode film 21 with the film web 10. A suitable device can be provided for this purpose, for example a heating device or the like. The film web 10 and / or the adhesive 1 can be heated for curing, drying, or crosslinking.For example, the coated film web 10 with the first dry electrode film 20 and / or the second dry electrode film 21 can be heated via a heated roller of the multi-roll calender 100. The heated roller can, for example, be a calender roller, e.g., the second roller 5 and / or the third roller 6. In some embodiments, the multi-roll calender 100 can alternatively or additionally comprise one or more further heated rollers (not shown in the figures). In some embodiments, the further heated roller, or optionally at least one, several or all further heated rollers, can be arranged behind the second and third rollers 5, 6 and / or behind the pair of rollers 5, 6 in the transport or conveying direction of the film web 10.

[0065] In and / or with the multi-roll calender 100, an electrode 110, preferably a dry electrode 110, can be formed and / or produced, for example, as described above, for example by applying dry electrode material 22 and / or the dry electrode film 20, 21.

[0066] The features of the invention disclosed in the above description, in the drawings and in the claims may be essential for the realization of the invention both individually and in any combination.

[0067] List of reference symbols

[0068] adhesive

[0069] Feeding system

[0070] Feeding system

[0071] roller

[0072] roller

[0073] roller

[0074] roller

[0075] From winding spool

[0076] Take-up spool

[0077] Current collector second nip

[0078] Roll gap first roll gap third roll gap

[0079] Dry electrode film

[0080] Dry electrode film

[0081] Dry electrode material

[0082] Multi-roll calender

[0083] electrode

[0084] Flexographic printing unit

[0085] supply line

[0086] Chamber doctor blade

[0087] Anilox roller

[0088] printing form cylinder

[0089] From winding spool

[0090] film web

[0091] Gravure printing plant

[0092] Form cylinder

[0093] bowls

[0094] Squeegee

[0095] tub

Claims

Claims: A method for coating an electrically conductive film web (210) with an electrically conductive adhesive (1), characterized in that the method comprises providing an electrically conductive film web (210) and printing the film web (210) with an electrically conductive adhesive (1). A method according to claim 1, wherein the adhesive (1) is provided as a liquid adhesive with a solvent that is volatile under normal conditions. A method according to claim 1 or 2, comprising drying and / or curing the electrically conductive adhesive (1) after printing the film web (210) with the electrically conductive adhesive (1). A method according to any one of the preceding claims, wherein the printing of the electrically conductive film web (210) is carried out using a gravure printing process and / or a flexographic printing process.A method according to claim 4, wherein, during printing, the electrically conductive film web (210) to be printed is passed through a roller gap (12) between a printing cylinder (204, 320) and an impression cylinder (204, 320). A method according to any of the preceding claims, wherein the electrically conductive adhesive (1) printed on the electrically conductive film web (10) is cured after printing, preferably dried and / or tempered and / or crosslinked. A method according to any of the preceding claims, wherein the film web (10) printed with the electrically conductive adhesive (1), optionally after a curing step, is wound up or fed directly into a calender (100), preferably a multi-roll calender, for the production of a dry electrode (110), preferably a lithium-ion electrode. A method according to any one of the preceding claims, comprising tempering the electrically conductive adhesive (1), in particular an adhesive, before coating the adhesive (1) onto the electrically conductive film web (10). A method according to any one of the preceding claims, comprising introducing the electrically conductive adhesive (1) into a plurality of cells (330) of a printing cylinder (320) for coating. A method according to any one of the preceding claims, comprising feeding the coated electrically conductive film web (10) into a second roll gap (11) of a multi-roll calender (100), wherein the second roll gap (11) receives the film web (10) and laminates it onto a first dry electrode film (20) and a second dry electrode film (21) to form a double-sided dry electrode (110). A method according to claim 10, comprising the steps: a.a. Providing a first dry electrode material (22) with a first feed system (2) for dry electrode material (22); b. Forming a first roll gap (13) between a first and a second calender roll (4, 5); c. Calendering a first dry electrode film (20) from the first dry electrode material in the first roll gap (13), preferably with a rotational speed of the second calender roll (5) that is greater than the rotational speed of the first calender roll (4). The method according to claim 11, which comprises forming a second roll gap (11) between a third calender roll (6) and a further calender roll (5), which is preferably arranged upstream of the third calender roll (6), wherein the first dry electrode film (20) is transferred into the second roll gap (11) after leaving the first roll gap (13), wherein the further calender roll (5) is preferably the second calender roll (5).Method according to claim 12, wherein the third calender roll (6) is operated at a rotational speed which is greater than a rotational speed of the further calender roll (5). A method according to any one of claims 10 to 13, comprising the steps of: a. forming a third roll gap (14) between a fourth calender roll (7) and a further calender roll (6), which is preferably arranged next to and / or downstream of the fourth calender roll (7), wherein the further calender roll (6) is preferably the third calender roll (6), b. receiving the second dry electrode material (22) from a second dry electrode material supply system (3) in the third roll gap (14), and c. forming a second dry electrode film (21) in the third roll gap (14). Method according to one of claims 10 to 14, comprising the insertion of the printed conductive film web (10) into the second roller gap (11), wherein the printed conductive film web (10) is laminated with the first dry electrode film (20) and the second dry electrode film (21), thereby obtaining a double-sided dry electrode (110).A method according to any one of claims 10 to 14, wherein the printed conductive film web (10) is introduced directly into the second roll gap (11) after printing, the film web (10) being introduced into the second roll gap (11) either after complete drying and / or curing or at least before complete drying and / or curing. A method according to claim 16, wherein the printing of the film web (210) is carried out in-situ by feeding the electrically conductive film web (10) into the second roll gap (11) of the multi-roll calender (100). A method according to claim 16 or 17, wherein the printed conductive film web (10) is cured, dried, and / or crosslinked in the multi-roll calender (100) after being introduced into the second roll gap (11).Method according to claim 18, wherein the film web (10) is heated for hardening, drying or crosslinking, preferably by heating the coated film web (10) with the first and / or the second dry electrode film (20, 21) via a heated roller of the multi-roll calender (100).

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