Method for de-coating coated film

Abstract

The invention relates to a method (10) for de-coating (12) coated film (13), the method (10) comprising: providing (14) at least one film element (28) having a coating (44); providing (16) at least one dry-ice element (26); removing (18) the coating (44) from the at least one film element (28) by means of the at least one dry-ice element (26) by moving (20) the at least one dry-ice element (26) and the at least one film element (28) against one another.

Description

[0001] Description

[0002] Title: Method for stripping coated film

[0003] The invention relates to a method for stripping coated film. The invention also relates to a method for recycling batteries comprising coated film and / or for recycling waste coated film in battery production, in particular battery cell production.

[0004] Residual coatings on films create a multitude of problems in recycling, especially in mechanical recycling, particularly of batteries, especially lithium-ion batteries, and electrode waste from production, especially also of next-generation batteries and electrodes, such as...

[0005] Solid-state batteries. Firstly, residual coatings on the foils pose a significant challenge for recycling. Foils, e.g., made of aluminum and copper, that are not completely separated from the coating material have a lower material quality and therefore a lower market value, and can only be processed in specialized facilities. In particular, under German waste legislation, the material may be classified as waste and not as a product, meaning these foils cannot be processed and directly recycled in conventional metal processing plants. Secondly, valuable materials such as nickel, cobalt, manganese, graphite, lithium, and titanium are lost when the coating material is discharged via the foil waste stream.Therefore, it is desirable to increase recycling rates for these valuable materials on the one hand, and on the other hand to categorize uncoated films as a product that significantly increases the market value of this film fraction and simplifies further recycling by reducing impurities.

[0006] Known approaches to stripping coated film include the use of various mills, such as impact or hammer mills, mixers, and thermal processes, e.g., using pyrolysis ovens. Mills utilize mechanical stress on the material, primarily through direct impact or shock loads, while pyrolysis ovens destroy a binder typically present in the coating through high temperatures. Stripping using mills or mixers is usually accompanied by significant contamination of the coating material fraction due to the high and / or prolonged mechanical stress and often leaves incompletely stripped films. This means the disadvantages of contaminated film fractions persist. Furthermore, the removed coating material is significantly contaminated by abrasion of the film's base material itself, particularly metal.Pyrolysis furnaces require high energy input and complex exhaust gas cleaning due to potential decomposition products from the binder material, such as hydrogen fluoride (HF). Furthermore, many non-metallic fractions are lost, including binder, electrolyte, and, to some extent, graphite.

[0007] DE 11 2022001 545 B4 describes another known approach in which the film is first cooled strongly using dry ice. This cooling typically makes the coating brittle. The still-cold film is then rolled and thus subjected to mechanical stress. The brittle coating can be worn away by the rolling action.

[0008] It is an object of the invention to propose a particularly simple method for stripping coated film.

[0009] The problem is solved by a method according to claim 1, i.e. a method for stripping coated film, wherein the method comprises:

[0010] Providing at least one foil element with a coating;

[0011] Providing at least one dry ice element; removing the coating from the at least one foil element by means of the at least one dry ice element by moving the at least one dry ice element and the at least one foil element against each other.

[0012] Moving the at least one dry ice element and the at least one foil element relative to each other means that the at least one dry ice element and the at least one foil element are in contact and moving relative to each other. As they move against each other, the at least one dry ice element acts abrasively, directly on the at least one foil element and its coating. The dry ice behaves like an abrasive. The dry ice also cools the foil and, in particular, the coating material, leading to embrittlement of the binder typically used in the coating. The combination of mechanical action and simultaneous embrittlement results in the effective, i.e., simple, fast, and cost-efficient, removal of the foil coating.Cooling and removal can therefore occur in a single process step, eliminating the need for separate, relatively complex steps. This makes the proposed method particularly simple and cost-effective.

[0013] The dry ice elements act similarly to an abrasive, with the added benefit of cooling the film elements, thus making the coating brittle and intensifying the abrasive action. Another unique feature is that the dry ice elements, or abrasive, gradually sublimate, transitioning directly from the solid to the gaseous phase and thus disappearing as a solid. Unlike other abrasives—think, for example, of sand—the dry ice elements are no longer present in the product after the process and do not need to be laboriously separated from the removed coating particles. In particular, the dry ice disappears almost completely without leaving any residue.

[0014] This process significantly improves the separation of films and coating material. In particular, it ensures that the film is no longer simply waste. Furthermore, it significantly reduces the contamination of the removed coating material.

[0015] In particular, all materials can be preserved in their original form, which is usually not the case with pyrolysis. Furthermore, the coating material typically does not degrade, react, or decompose during the process, making the method suitable for direct recycling, i.e., recovery and reuse of the functional or active materials without breaking them down into their individual elements. In principle, one of the at least one dry ice element and one of the at least one foil element can also be static, while the other moves and generates the relative motion.

[0016] This process has a wide range of applications. These include the development of new stripping systems for removing material scrap from battery production (such as electrodes) as well as for stripping films, separators, and housing materials from end-of-life battery recycling. This results in particular application opportunities in the mechanical and plant engineering sectors and in applied engineering.

[0017] (Battery) recycling. Furthermore, this process can reduce the raw material dependency of the battery industry by increasing recycling rates and decreasing the demand for primary materials. In addition, the process can strengthen the economic competitiveness of the industry through the increased added value generated by recycling.

[0018] The at least one foil element can, for example, be at least one metal foil element. In the case of multiple foil elements, some or all of the foil elements can be metal foil elements. A foil element is also referred to as a metal foil element if it has, for example, a non-metallic base layer, such as a plastic layer, and an additional metallic layer.

[0019] The at least one foil element can, for example, be made of copper or a copper alloy. The at least one foil element can, for example, be made of aluminum or an aluminum alloy. These specifications preferably refer to a base material of the at least one foil element. A coating to be removed from the at least one foil element is typically made of a different material.

[0020] For example, the at least one foil element could be an aluminum current collector foil or a part thereof. The at least one foil element could, for example, have been installed in a battery or be no longer needed as scrap or offcuts during battery production.

[0021] The at least one film element can preferably be at least one plastic film element. In the case of multiple film elements, some or all of the film elements can be plastic film elements.

[0022] The term "dry ice" encompasses any type of carbon dioxide (CO2) in its solid state. Dry ice can take various forms, for example, as many small individual particles, as a few large elements, or even as a single element.

[0023] The movement of the at least one dry ice element and the at least one foil element relative to each other can preferably be carried out in such a way that the at least one dry ice element and the at least one foil element collide, strike, press, shear and / or cut against each other.

[0024] The coating can be, for example, a ceramic coating and / or a carbon coating.

[0025] The coating of at least one foil element can be applied to one or both sides. The coating can comprise one or more layers.

[0026] In principle, for example, exactly one film element with a coating can be provided, such as in the form of a film roll. Alternatively, for example, a plurality of film elements, each with a coating, can be provided. The plurality of film elements can, for example, be provided in the form of film scraps.

[0027] In principle, exactly one dry ice element can be provided, for example, in the form of a block or a plate and / or with a mass of at least 10 g, preferably at least 30 g, preferably at least 100 g, and preferably at least 300 g. Alternatively, a plurality of dry ice elements can be provided. These plurality of dry ice elements can be provided, for example, as spheres, cubes, pellets, and / or nuggets, or as a mixture of at least two of these element types. It is also possible for the plurality of dry ice elements to be provided in an irregular shape.

[0028] For example, exactly one foil element and exactly one dry ice element can be provided. For example, multiple foil elements and exactly one dry ice element can be provided. For example, exactly one foil element and multiple dry ice elements can be provided. For example, multiple foil elements and multiple dry ice elements can be provided.

[0029] Multiple dry ice elements can be supplied, for example, as individual items or in bulk. When supplied as individual items, the dry ice elements can be individually combined with at least one foil element. When supplied in bulk, multiple dry ice elements can be poured into a container for combination with at least one foil element.

[0030] Multiple foil elements can be supplied, for example, as individual items or in bulk. If supplied as individual items, the foil elements can be individually combined with at least one dry ice element. If supplied in bulk, multiple foil elements can be poured into a container for combination with at least one dry ice element.

[0031] The movement of the at least one dry ice element and the at least one foil element relative to each other can preferably be effected by a movable, preferably rotating, oscillating, pivoting, and / or vibrating, moving element. The moving element can, for example, be separate from a container in which the at least one foil element and the at least one dry ice element are located. For example, the moving element can be an agitator. The moving element, separate from the container, can, for example, be at least partially arranged or arrangeable within the container. Alternatively or additionally, it is possible, for example, to move a container in which the at least one foil element and the at least one dry ice element are located to effect the movement of the at least one dry ice element and the at least one foil element relative to each other. In other words, the moving element can also be a container.

[0032] According to one embodiment, the moving element has a fastest reference point, wherein the fastest reference point has a speed of at least 1 m / s, preferably for a period of at least 15 seconds. This embodiment allows for particularly effective removal of the coating. A relatively high speed of the moving element is used in this process. It is possible that no or only a small additional compressive stress is exerted.

[0033] According to one embodiment, the moving element exerts a compressive stress of at least 50,000 N / m². 2 , preferably at least 150,000 N / m 2The pressure is applied to at least one dry ice element and at least one foil element, preferably for a period of at least one second. This embodiment allows for particularly effective removal of the coating. Even stress with relatively high compressive force is effective. The speed can remain relatively low. A combination of high speed and high compressive force is also possible.

[0034] According to one embodiment, the moving element engages only the at least one dry ice element and not the at least one foil element. For example, a fairly large dry ice element can be used as a kind of grinding stone. The moving element can, for example, hold and / or grip the at least one dry ice element.

[0035] According to one embodiment, the movement of the at least one dry ice element and the at least one foil element relative to each other is effected by an airflow. An advantage of this embodiment is that it generally does not require a moving element. However, it can also be combined with a moving element. The airflow can, for example, be generated using compressed air.

[0036] The movement of the at least one dry ice element and the at least one foil element relative to each other can alternatively or additionally be achieved, for example, by blasting a plurality of dry ice elements onto the at least one foil element. Devices for blasting dry ice are widespread and readily available. Thus, this approach represents a particularly simple solution for coating removal.

[0037] According to one embodiment, the method comprises bringing together the at least one foil element with a coating and the at least one dry ice element in a container. The movement of the at least one dry ice element and the at least one foil element relative to each other can preferably take place after the assembly and / or be continued. The movement of the elements can be effected, for example, by moving the container.

[0038] Basically, exactly one foil element with a coating, or multiple foil elements, each with a coating, and exactly one dry ice element, or multiple dry ice elements, can be combined in the container. During movement, at least one foil element can be broken down, resulting in more, but smaller, foil elements. Similarly, during movement, at least one dry ice element can be broken down, resulting in more, but smaller, dry ice elements.

[0039] According to one embodiment, the method comprises providing a plurality of foil elements, each with a coating; providing a plurality of dry ice elements; bringing the foil elements and the dry ice elements together in a container; removing the coating from the foil elements by means of the dry ice elements by moving the dry ice elements and the foil elements against each other.

[0040] According to one embodiment, the container includes a sieve. An advantage of this embodiment is that separation can occur simultaneously during the removal of the coating or during the movement of the at least one dry ice element and the at least one foil element relative to each other. Thus, no separate separation step is necessary. Transferring the material to a separate sieve is also unnecessary.

[0041] Moving the at least one dry ice element and the at least one foil element relative to each other can preferably be achieved by mixing them using a mixer. This is a particularly simple approach. The mixer can, for example, be a solid mixer. The container can, for example, be part of the mixer.

[0042] According to one embodiment, the movement of the at least one dry ice element and the at least one foil element relative to each other can be achieved by crushing them using a crusher. This is also a particularly simple approach. The crusher can, for example, be a cutting crusher, an impact crusher, a friction crusher, an impact crusher, an eddy current mill, or a jet mill. The container can preferably be part of the crusher.

[0043] According to one embodiment, the movement of the at least one dry ice element and the at least one foil element relative to each other can be achieved by dispersion using a dispersing machine. This is also a particularly simple approach. For example, a device that functions as both a crusher and a dispersing machine can also be used.

[0044] The at least one foil element can preferably have a temperature above zero degrees, in particular approximately room temperature, immediately before the at least one foil element and the at least one dry ice element are brought into contact with each other. The cooling required for the embrittlement of the coating can, for example, be achieved entirely by the dry ice. Therefore, no separate cooling step is necessary. The process is thus further simplified.

[0045] The at least one dry ice element may preferably have a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g. If multiple dry ice elements are provided, preferably at least 80 percent by weight of the dry ice elements may each have a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g.

[0046] The mass ratio of the at least one dry ice element to the at least one coated foil element can preferably be at least 0.1, preferably at least 0.2. It has been shown that even with a relatively small amount of dry ice, the coating can still be effectively removed. The process is therefore particularly efficient. The mass ratio refers to the total mass of the dry ice elements relative to the total mass of the coated foil elements.

[0047] The movement of the at least one dry ice element and the at least one foil element relative to each other can preferably be carried out until the at least one dry ice element has sublimated to at least 80% by weight, preferably at least 90% by weight, and preferably at least substantially completely. It has been shown that this method is particularly efficient.

[0048] During the movement of the at least one dry ice element and the at least one foil element relative to each other, coating particles and / or agglomerates from these detach from the at least one foil element. According to one embodiment, the method comprises separating the coating particles and / or the coating particle agglomerates from the at least one foil element, preferably by means of sieves. The separation can preferably take place during the movement of the at least one dry ice element and the at least one foil element relative to each other and / or subsequently.

[0049] The movement of the at least one dry ice element and the at least one foil element can preferably be carried out in an isolated atmosphere, under vacuum, and / or in dry air. This prevents water from forming during the process and facilitates subsequent sieving. Further drying is also unnecessary. Preferably, the assembly of the at least one dry ice element and the at least one foil element, particularly in a container, can also be carried out in an isolated atmosphere, under vacuum, and / or in dry air.

[0050] Preferably, the at least one foil element is cooled by the dry ice to below -20 °C, preferably below -30 °C, preferably below -40 °C.

[0051] The invention also relates to a method for recycling batteries comprising coated foil, wherein the method comprises stripping at least one foil element by means of a method of the type described above.

[0052] The batteries may preferably be lithium batteries, lithium-ion batteries, solid-state batteries, sulfide solid-state batteries and / or sodium-ion batteries.

[0053] Basically, the term battery also includes an accumulator, i.e., a rechargeable battery.

[0054] The invention also relates to a method for recycling waste coated film in battery production, in particular battery cell production, wherein the method comprises stripping the coating from at least one film element by means of a method of the type described above. The battery production or battery cell production can preferably involve the production of lithium batteries, lithium-ion batteries, solid-state batteries, sulfide solid-state batteries and / or sodium-ion batteries or cells for such batteries.

[0055] Where ordinal numbers are used herein, they serve only to simplify reference and are not to be understood as a restriction regarding the total number of elements or their order of arrangement. In particular, the presence of a second element does not necessarily imply the presence of a first element.

[0056] If devices and methods are described herein, the described methods can be advantageously further developed by the embodiments and individual features of the devices, and vice versa.

[0057] The invention will below be explained only by means of examples shown in schematic drawings.

[0058] Fig. 1 illustrates a method for stripping coated film.

[0059] Fig. 2 illustrates a method for stripping coated film.

[0060] Fig. 3 shows dry ice elements and foil elements in a container with a moving element.

[0061] Fig. 4 shows dry ice elements and foil elements in a container with a moving element.

[0062] Fig. 5 shows a dry ice element and foil elements with a movement element.

[0063] Fig. 6 shows dry ice elements and foil elements in a container with an airflow. Fig. 7 shows dry ice elements being blasted onto a foil element.

[0064] Fig. 8 shows dry ice elements being blasted onto foil elements.

[0065] Fig. 9 shows dry ice elements and foil elements in a container with a moving element.

[0066] Fig. 10 shows dry ice elements and foil elements in a mixer.

[0067] Fig. 11 shows dry ice elements and foil elements in a crusher.

[0068] Fig. 12 shows dry ice elements and foil elements in a container.

[0069] Fig. 13 illustrates a method for recycling batteries which comprise coated foil.

[0070] Fig. 14 illustrates a process for recycling waste coated film in battery production.

[0071] Fig. 1 illustrates a method 10 for stripping 12 from coated foil 13. The method 10 comprises providing 14 at least one foil element with a coating. The method 10 comprises providing 16 at least one dry ice element. The method 10 comprises removing 18 the coating from the at least one foil element by means of the at least one dry ice element by moving 20 the at least one dry ice element and the at least one foil element relative to each other.

[0072] In method 10 of Fig. 1, the movement 20 of the at least one dry ice element and the at least one foil element relative to each other preferably takes place such that the at least one dry ice element and the at least one foil element collide, strike, press, shear, and / or cut against each other. In method 10 according to Fig. 1, when providing 14 at least one foil element, for example, a plurality of foil elements, each with a coating, can be provided. In method 10 according to Fig. 1, when providing 16 at least one dry ice element, for example, a plurality of dry ice elements can be provided.

[0073] Fig. 2 illustrates a method 10 for stripping 12 from coated foil 13. The method 10 according to Fig. 2 comprises providing 14 of at least one foil element with a coating. The method 10 according to Fig. 2 comprises providing 16 of at least one dry ice element. The method 10 according to Fig. 2 comprises bringing together 21 the at least one coated foil element and the at least one dry ice element in a container. The method 10 according to Fig. 2 comprises removing 18 of the coating from the at least one foil element by means of the at least one dry ice element by moving 20 the at least one dry ice element and the at least one foil element relative to each other.

[0074] During the movement 20 of the at least one dry ice element and the at least one foil element relative to each other in the method 10 according to Fig. 2, coating particles detach from the at least one foil element. The method 10 according to Fig. 2 comprises separating 22 the coating particles from the at least one foil element, preferably by means of sieves 23. The separation 22 can preferably take place during the movement 20 of the at least one dry ice element and the at least one foil element relative to each other and / or subsequently thereafter.

[0075] Fig. 3 shows a container 24 containing a plurality of dry ice elements 26 and a plurality of foil elements 28, the foil elements 28 each having a coating. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk form and were previously poured into the container 24 and thus brought together within it.

[0076] Figure 3 also shows a moving element 30, which is designed here to rotate, i.e., as a rotor 32. The rotation 34 of the rotor 32 is indicated by an arrow in Figure 3. The movement or rotation 34 of the moving element 30 causes the dry ice elements 26 and the foil elements 28 to move relative to each other, causing them to contact multiple times. On the one hand, the physical interaction—in particular, the collision—between the dry ice elements 26 and the foil elements 28 leads to the removal of the coating from the foil elements 28. On the other hand, the dry ice elements 26 cause the foil elements 28 to cool to a temperature at which the coating of the foil elements becomes brittle. The cold and brittle coating can be removed mechanically particularly easily.The dry ice elements 26 thus act similarly to an "abrasive," with the special effect of also cooling the foil elements, thereby making the coating brittle and thus the "abrasive" more effective. Another special feature is that the dry ice elements 26, or the "abrasive," gradually sublimate, meaning they transition directly from the solid phase to the gas phase and thus disappear as a solid. Unlike other "abrasives"—for example, sand—the dry ice elements 26 are no longer present in the product after the process and do not need to be laboriously separated from the removed coating particles. In particular, the dry ice disappears in this way, leaving virtually no residue.

[0077] Figure 3 shows a fastest reference point 36 of the motion element 30. The fastest reference point 36 preferably has a speed of at least 1 m / s, preferably for a time interval of at least 15 seconds.

[0078] Fig. 4 shows a container 24 containing a plurality of dry ice elements 26 and a plurality of foil elements 28, each with a coating. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk form and were previously poured into the container 24 and thus brought together within it.

[0079] Figure 4 also schematically shows a moving element 30, which is designed here to rotate, i.e., as a rotor 32. The rotation 34 of the rotor 32 is indicated in Figure 4 by an arrow. The movement or rotation 34 of the moving element 30 moves the dry ice elements 26 and the foil elements 28 relative to each other. The moving element 30 also exerts a compressive stress 38 on the dry ice elements 26 and the foil elements 28, preferably a compressive stress 38 of at least 50,000 N / m². 2 , preferably at least 150,000 N / m 2 , preferably for a period of at least 1 second.

[0080] Fig. 5 shows a dry ice element 26 and a plurality of foil elements 28. A movement element 30 only engages the dry ice element 26 and not the foil elements 28. The foil elements 28 are shown here as an example in bulk.

[0081] In the example shown in Fig. 5, the moving element 30 holds the dry ice element 26 in place, performs a rotation 34, and exerts a compressive stress 38 on the dry ice element 26 and consequently on the foil elements 28. The dry ice element 26 acts here similarly to a millstone. The axis of rotation of the moving element can be horizontal instead of vertical.

[0082] Fig. 6 shows a container 24 containing a plurality of dry ice elements 26 and a plurality of coated foil elements 28. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk form and were previously poured into the container 24, thus bringing them together. The dry ice elements 26 and the foil elements 28 are moved against each other by an airflow 40. The airflow 40 is provided here, by way of example, by a compressed air nozzle 42.

[0083] Fig. 7 shows a foil element 28 with a coating 44, exemplified as a foil web 46, which runs between two rollers 48. Dry ice elements 26 are blasted against the foil element 28 using a dry ice blaster 50. The dry ice elements 26 and the foil element 28 are thus moved against each other. The dry ice elements 26 cool the foil element 28 and remove the coating 44 from the foil element 28.

[0084] Subsequently, the removed coating particles 52 fall down and can be collected in a container 54. Remnants of the dry ice elements 26 may also be present and fall down into the container 54. The dry ice elements 26 gradually sublimate or disappear.

[0085] Fig. 8 shows a container 24 in which a plurality of foil elements 28, for example in the form of foil scraps, each with a coating, are arranged. Dry ice elements 26 are blasted against the foil elements 28 by means of a dry ice blaster 50. The dry ice elements 26 and the foil elements 28 are thus moved against each other. The dry ice elements 26 cool the foil element 28 and remove the coating from the foil element 28. The process can be carried out, for example, discontinuously or continuously, i.e., with the metal foil elements being transported further. In continuous operation, for example, a chain conveyor can be used to continuously transport the metal foil elements.

[0086] Fig. 9 shows a container 24 from above, in which a plurality of dry ice elements 26 and a plurality of foil elements 28, each with a coating, are arranged. The dry ice elements 26 and the foil elements 28 are moved by means of a movement element 30, which has two arms 56 and performs a rotation 34. Instead of or in addition to the rotation of the movement element 30, the container 24 can also rotate.

[0087] Fig. 10 shows a container 24 containing a plurality of dry ice elements 26 and a plurality of foil elements 28, each with a coating. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk form and were previously poured into the container 24 and thus preferably brought together within the container 24.

[0088] The container 24 according to Fig. 10 is part of a mixer 58. The dry ice elements 26 and the foil elements 28 are moved against each other by mixing 60 using the mixer 58. The mixer 58 can preferably be a solid mixer 62. Fig. 11 shows a container 24 in which a plurality of dry ice elements 26 and a plurality of foil elements 28, each with a coating, are located. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk and were previously poured into the container 24 and thus preferably brought together in the container 24.

[0089] The container 24 according to Fig. 11 is part of a shredder 64. The dry ice elements 26 and the foil elements 28 are moved against each other by shredding 66 using the shredder 64. Different mechanisms can be used to generate the relative motion. The shredder 64 can, for example, be a cutting shredder 68, an impact shredder 70, a friction shredder 72, an impact shredder 73, an eddy current mill 74, or a jet mill 75.

[0090] In the example shown in Fig. 11, the shredder 64 is also a dispersing machine 76. The movement of the dry ice elements 26 and the foil elements 28 relative to each other is also achieved here by dispersing 77 using the dispersing machine 76. However, a device that is only a dispersing machine 76 can also be used.

[0091] Fig. 12 shows a container 24 containing a plurality of dry ice elements 26 and a plurality of foil elements 28, each with a coating. The dry ice elements 26 and the foil elements 28 are shown here as examples in bulk form and were previously poured into the container 24 and thus preferably brought together within the container 24.

[0092] Figure 12 also shows a drive unit 78. The drive unit 78 powers a vibrating motion 80 of the container 24, which is transmitted to the dry ice elements 26 and the foil elements 28, causing the dry ice elements 26 and the foil elements 28 to move relative to each other. The container 24 acts here as a moving element 30.

[0093] The container 24 of Fig. 12 includes a sieve 82. This allows worn coating particles to be separated directly during the removal process or during the movement of the dry ice elements 26 and the foil elements 28 against each other.

[0094] Instead of or in addition to the shaking motion of the container, an airflow can also be introduced, for example, to move the dry ice elements and the foil elements against each other, as indicated in Fig. 6. As shown in Fig. 12, an airflow can, for example, be introduced through the sieve 82.

[0095] As shown in the figures described above, the foil elements 28 can preferably have a temperature above zero degrees, in particular about room temperature, immediately before the foil elements 28 and the dry ice element 26 are brought into contact with each other.

[0096] With reference to the figures described above, the at least one dry ice element 26 can have a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g, or a plurality of dry ice elements 26 can be provided, wherein at least 80 percent by weight of the dry ice elements 26 each have a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g.

[0097] With reference to the figures described above, the mass ratio of the at least one dry ice element 26 to the at least one foil element 28 can be at least 0.1, preferably at least 0.2.

[0098] With reference to the figures described above, the movement of the at least one dry ice element 26 and the at least one foil element 28 relative to each other can be carried out until the at least one dry ice element 26 has sublimated to at least 80% by weight, preferably at least 90% by weight, and preferably at least substantially completely. With reference to the figures described above, the movement of the at least one dry ice element 26 and the at least one foil element 28 can preferably be carried out in an isolated atmosphere 84, under vacuum 85 and / or in dry air 86, as is shown by way of example in Fig. 3.

[0099] Fig. 13 illustrates a method 88 for recycling 90 batteries 92 which comprise coated foil 13, wherein the method 88 comprises stripping 12 of at least one foil element by means of a method 10 of the type described above.

[0100] The batteries 92 may preferably be lithium batteries, lithium-ion batteries, solid-state batteries, sulfide solid-state batteries and / or sodium-ion batteries.

[0101] Fig. 14 illustrates a method 96 for recycling 98 of rejects 100 of coated film 102 in a battery production 104, wherein the method 96 comprises stripping 12 of at least one film element by means of a method 10 of the type described above.

[0102] Battery production 104 may preferably involve the production of lithium batteries, lithium-ion batteries, solid-state batteries, sulfide solid-state batteries and / or sodium-ion batteries.

[0103] Where similar or identical elements are shown in different figures, reference symbols have been assigned accordingly. For the sake of clarity, multiple descriptions of similar or identical elements have been avoided.

[0104] Nevertheless, the embodiments of the figures can be combined with one another and further developed accordingly into the other embodiments and by their individual features. (Reference symbol (part of the description))

[0105] 10 procedures

[0106] 12. Layer removal

[0107] Slide 13

[0108] 14. Provide

[0109] 16 Provide

[0110] 18 Remove

[0111] 20 Move

[0112] 21 Bringing Together

[0113] 22 Separate

[0114] 23 Move

[0115] 24 containers

[0116] 26 T dry ice element

[0117] 28 foil element

[0118] 30 movement elements

[0119] 32 Rotor

[0120] 34 Rotation

[0121] 36 Reference point

[0122] 38 Compressive stress

[0123] 40 airflow

[0124] 44 Coating

[0125] 42 Compressed air nozzle

[0126] 46 foil strips

[0127] 48 rolls

[0128] 50 dry ice blasters

[0129] 52 coating particles

[0130] 54 containers

[0131] 56 Arm

[0132] 58 mixers

[0133] 60 Mixes

[0134] 62 solid mixers

[0135] 64 Shredders

[0136] 66 Shredding Cutting shredder Impact shredder Friction shredder Impact shredder Vortex mill Jet mill Dispersing machine Dispersing Drive unit Movement

[0137] Sieve

[0138] isolated atmosphere vacuum dried air process recycling

[0139] Battery Recycling Process Waste

[0140] Battery production

Claims

Patent claims 1. Method (10) for stripping (12) from coated foil (13), in particular metal foil, the procedure (10) comprises: Providing (14) at least one foil element (28) with a coating (44); Providing (16) at least one dry ice element (26); Removal (18) of the coating (44) from the at least one foil element (28) by means of the at least one dry ice element (26) by moving (20) the at least one dry ice element (26) and the at least one foil element (28) against each other.

2. Method (10) according to claim 1, wherein the movement (10) of the at least one dry ice element (26) and the at least one foil element (28) is carried out against each other in such a way that the at least one dry ice element (26) and the at least one foil element (28) collide, strike, press, shear and / or cut against each other.

3. Method (10) according to any one of the preceding claims, wherein a plurality of foil elements (28) are each provided with a coating (44) and / or a plurality of dry ice elements (26) are provided.

4. Method (10) according to any one of the preceding claims, wherein the movement (20) is effected by a movable, preferably rotating, oscillating, pivoting and / or vibrating, movement element (30), preferably wherein the moving element is designed separately from a container in which the at least one foil element and the at least one dry ice element are located, or preferably wherein the moving element is a container in which at least one foil element and at least one dry ice element are located.

5. Method (10) according to claim 4, wherein the motion element (30) has a fastest reference point (36) and wherein the fastest reference point (36) has a speed of at least 1 m / s, preferably for a period of at least 15 seconds.

6. Method according to one of claims 4 to 5, wherein the moving element (30) has a compressive stress (38) of at least 50,000 N / m 2 , preferably at least 150,000 N / m 2 , on which at least one dry ice element (26) and at least one foil element (28) exerts pressure, preferably for a period of time of at least 1 second.

7. Method (10) according to any one of claims 4 to 6, wherein the moving element (30) only attacks the at least one dry ice element (26) and not the at least one foil element (28).

8. Method (10) according to any one of the preceding claims, wherein the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) relative to each other is caused by an airflow (40).

9. Method (10) according to any one of the preceding claims, wherein the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) relative to each other is effected by blasting a plurality of dry ice elements (26) onto the at least one foil element (28).

10. Method (10) according to any one of the preceding claims, the procedure (10) comprises:

11. Method (10) according to any one of the preceding claims, the procedure (10) comprises: Providing (14) a plurality of foil elements (28), each with a coating (44); Providing (16) a plurality of dry ice elements (26); Bringing together (21) the foil elements (28) and the dry ice elements (28) in a container (24); Removal (18) of the coating (44) from the foil elements (28) by means of the dry ice elements (26) by moving (20) the dry ice elements (26) and the foil elements (28) against each other.

12. Method (10) according to claims 10 to 11 , wherein the container (24) includes a sieve (82).

13. Method (10) according to any one of the preceding claims, wherein the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) relative to each other is effected by mixing (60) using a mixer (58), preferably wherein the mixer (58) is a solid mixer (62).

14. Method (10) according to any one of the preceding claims, wherein the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) relative to each other is effected by crushing (66) using a crusher (64), preferably wherein the crusher (64) is a cutting crusher (68), an impact crusher (70), a friction crusher (72), an impact crusher (73), a whirlpool mill (74) or a jet mill (75) and / or wherein the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) relative to each other is effected by dispersion (77) using a dispersion machine (76).

15. Method (10) according to any one of the preceding claims, wherein immediately before the at least one foil element (28) and the at least one dry ice element (26) are brought into contact with each other, the at least one foil element (28) has a temperature above zero degrees, in particular about room temperature.

16. Method (10) according to any one of the preceding claims, wherein the at least one dry ice element (26) has a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g, preferably wherein a plurality of dry ice elements (26) are provided, wherein at least 80 percent by weight of the dry ice elements (26) each have a mass of at least 1 g, preferably at least 3 g, preferably at least 5 g, and / or at most 500 g, preferably at most 100 g, preferably at most 30 g, preferably at most 20 g, and / or wherein the mass ratio of the at least one dry ice element (26) to the at least one foil element (28) with a coating is at least 0.1, preferably at least 0.

2.

17. Method (10) according to any one of the preceding claims, wherein at least the movement (30) of the at least one dry ice element (26) and the at least one foil element (28) is carried out in an isolated atmosphere (84), under vacuum (85) and / or in dry air (86).

18. Methods (88, 96) for recycling (90) batteries (92) comprising coated foil (13) and / or for recycling (98) rejects (100) of coated foil (13) in a battery production (104), in particular battery cell production, the procedure (88, 96) includes: Stripping (12) of at least one foil element (28) by means of a method (10) according to one of the preceding claims.

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