Coating apparatus, method, and electrode

Abstract

To provide a coating device and a method for manufacturing an electrode.SOLUTION: In relation to a coating device 10 to manufacture an electrode 11 having a two-layer structured powder layer 12 on a substrate 15, the coating device includes: a feed unit 17 configured to feed the substrate 15 into a pressing gap 18; a first metering unit 19 to accommodate a first powder 20 and a second powder 21 for parallel filling of a first metering gap 22 with the first powder and the second powder; and a roller device 23. The roller device includes a first application roller 24, a first pressing roller unit 25, and a second pressing roller unit 26. The first metering gap is provided between the first application roller and the first pressing roller unit. The pressing gap is provided between the first pressing roller unit and the second pressing roller unit. The first metering gap is provided to apply the first powder and the second powder as a two-layer structured layer 27 to the first pressing roller unit with a first application force. The pressing gap is provided to transfer the two-layer structured layer from the first pressing roller unit to a first side 28 of the substrate with a pressing force.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a coating device for manufacturing an electrode having at least one powder layer of a two-layer structure on a substrate, which has the features described in independent claim 1, a method for manufacturing an electrode having at least one powder layer of a two-layer structure, which has the features described in independent claim 6, and an electrode having a powder layer of a two-layer structure, which has the features described in independent claim 13.

[0002] In attempts for solvent-free or dry-type electrode manufacturing, electrodes having a single-layer coating have conventionally been produced. In order to improve the performance of battery cells, in conventional electrode manufacturing, an approach of manufacturing electrodes having a multi-layer coating (various different compositions of individual layers) has been pursued. This is because such electrodes have increased energy density and conductivity.

[0003] Currently, electrodes having a multi-layer coating produced without using a solvent are often fabricated as self-supporting films. In this case, two powders are pressed onto a current collector within a calender gap.

[0004] However, still, it is standard that the electrodes are wet-processed and thus contain a solvent.

[0005] Another mode is the sequential deposition of individual layers onto the provided side of the substrate. For this, for example, in two sequentially arranged calender gaps, the deposition and pressing of each individual layer as a self-supporting film can be performed.

[0006] However, in this case, often, an adhesion promoter or a certain amount of moisture of the powder is required. This is because otherwise, the adhesion of each layer cannot be guaranteed. As a result, a substrate or current collector with an incomplete coating may occur. Similarly, this causes an increase in defective products or a decrease in power of the electrodes thus manufactured.

[0007] Therefore, an object of the present invention is to overcome at least one of the aforementioned drawbacks, at least partially. In particular, an object of the present invention is to provide a coating apparatus that enables dry-type electrode manufacturing, thereby increasing the conductivity or energy density of the electrode. Furthermore, an object of the present invention is to provide a method for dry-type electrode manufacturing and an electrode manufactured in this manner.

[0008] The above-mentioned problems are solved by a coating apparatus having the features described in independent claim 1, a method having the features described in independent claim 6, and an electrode having the features described in independent claim 13. Further features and details of the present invention will become apparent from the dependent claims, specification and drawings. In this specification, the features and details described in relation to the coating apparatus according to the present invention are, of course, also valid in relation to the method according to the present invention and / or in relation to the electrode according to the present invention, and vice versa, so that the disclosures for individual embodiments of the present invention are always, or may be, related to one another.

[0009] According to the present invention, in a first aspect of the present invention, a coating apparatus is envisioned for manufacturing an electrode having at least one two-layer powder structure, in particular a two-layer cathode layer and / or a two-layer anode layer, on a substrate, in particular a current collector. The coating apparatus includes a supply unit for supplying the substrate into a crimping gap, a first metering unit for containing a first powder and a second powder and for filling a first metering gap with the first powder and the second powder in parallel, and a roll apparatus, the roll apparatus having a first adherend roll, a first crimping roll unit and a second crimping roll unit. Here, the first metering gap is provided between the first adherend roll and the first crimping roll unit, and the crimping gap is provided between the first crimping roll unit and the second crimping roll unit. The first metering gap is provided to adhere the first powder and the second powder to the first crimping roll unit by a first adhesive force, as a first layer of at least two layers. The crimping gap is provided to transfer the first layer of at least two layers from the first crimping roll unit to the first side of the supplied substrate by a crimping force.

[0010] The coating apparatus is based on a coating carried by rolls, where first, a layer with at least two layers is applied to the rolls, and then transferred or pressed from the rolls onto the substrate. This is particularly advantageous for coating substrates with dry powder materials that do not contain solvents, and therefore the coating apparatus is very suitable for dry-type electrode manufacturing.

[0011] The first and second crimping roll units may each have one crimping roll. The crimping rolls of the first and second crimping roll units, which form a crimping gap to apply a crimping force for transferring at least two layers, rotate facing each other at the same rotational speed, thereby providing an optimal coating result. The first workpiece roll may have a lower rotational speed than the crimping roll of the first crimping roll unit, which together forms a metering gap with the first workpiece roll, thereby ensuring that the first and second powders remain attached to the first crimping unit as the first layer and are carried by the first crimping unit.

[0012] The first metering unit meteres both the first and second powders simultaneously, enabling the adhesion of the desired two-layer structure during the crimping process, i.e., through the crimping gap. Note that the first and second powders are packed side by side and mix only in the boundary region. To reduce mixing of the first and second powders, the first metering unit may have a first chamber for the first powder and a second chamber for the second powder.

[0013] The ratio of the first powder to the second powder in the first layer may be variable to generate various layer thicknesses. For this purpose, a control unit may be provided to control the ratio of each powder using open-loop and / or closed-loop control.

[0014] Furthermore, parallel, simultaneous metering or filling of the metering gap increases the efficiency of the coating apparatus. This is because only one roll device is required to form the two-layer powder structure on the substrate. By simultaneously forming the two-layer powder structure, the formation of a boundary layer between the two powder layers is reduced or prevented, thereby improving adhesion and electrical connectivity.

[0015] Within the framework of the coating apparatus invention, it may be advantageous that a second metering unit is provided for containing a third powder and a fourth powder, and for filling a second metering gap in parallel with the third powder and the fourth powder, and that the roll equipment has at least one second adherend roll, and the second metering gap is provided between the second adherend roll and the second crimping roll unit. Here, the second metering gap is provided for adhering the third powder and the fourth powder as a second at least two-layer structure to the second crimping roll unit by a second adhering force. The crimping gap between the first crimping roll unit and the second crimping roll unit is provided for transferring the second at least two-layer structure from the second crimping roll unit to the second side of the supplied substrate by a crimping force.

[0016] The second adherend roll may have a lower rotational speed than the crimping roll of the second crimping roll unit, which together form a metering gap with the second adherend roll, thereby ensuring that the third and fourth powders remain attached to the second crimping unit as a second layer and are carried by the second crimping unit.

[0017] The second metering unit meteres both the third and fourth powders simultaneously, enabling the adhesion of the desired two-layer structure during the crimping process, i.e., through the crimping gap. Note that the third and fourth powders are packed side by side and mix only in the boundary region. To reduce mixing of the third and fourth powders, the second metering unit may have a third chamber for the third powder and a fourth chamber for the fourth powder.

[0018] The ratio of the third powder to the fourth powder in the second layer may be variable to produce various layer thicknesses. For this purpose, a control unit may be able to control the ratio of each powder using open-loop and / or closed-loop control.

[0019] Furthermore, it is conceivable that the first powder and the third powder have the same composition, and / or that the second powder and the fourth powder have the same composition.

[0020] Within the framework of the present invention, the first crimping roll unit may have at least one first crimping roll and at least one second crimping roll, wherein at least one first press gap is provided between the at least one first crimping roll and at least one second crimping roll. Additionally or alternatively, the second crimping roll unit may have at least one third crimping roll and at least one fourth crimping roll, wherein at least one second press gap is provided between the at least one third crimping roll and at least one fourth crimping roll.

[0021] The first and / or second press gaps press the first or second layer, after which the first or second layer is delivered to the substrate. This creates a denser packing of the first and second layers, thereby further improving conductivity. Furthermore, the press gaps have the additional effect of reducing the shear force acting in both the metering gap and the crimping gap, as less force is required for adhesion or delivery in these gaps. This results in uniform adhesion and delivery, and reduces defects during adhesion or delivery.

[0022] Here, it is also conceivable that the first crimping roll unit and / or the second crimping roll unit have another crimping roll and a resulting other press gap.

[0023] Within the framework of the present invention, it may be assumed that the first metering unit has a first separation plate for separating the first powder from the second powder in the region of the first metering gap. Additionally or alternatively, the second metering unit has a second separation plate for separating the third powder from the fourth powder in the region of the second metering gap.

[0024] In this case, the first or second separation plate penetrates only within the region of the first or second metering gap without closing each metering gap. The separation plate is used to separate individual powders until immediately before the powder is deposited as the first or second layer. The separation plate reduces mixing in the boundary region of the first or second layer, which is particularly advantageous for the energy density of the first or second layer.

[0025] Here, it is conceivable that the first and / or second separation plates have a structure. This structure can comb through each powder to dissolve any clumps that may form and / or to provide better transport to the metering gap. It is also conceivable that the separation plates be vibrated by electrical and / or pneumatic excitation, which may further improve transport.

[0026] It is further conceivable that in the region of the first metering gap, a first shielding plate is provided in the region of the first adherend roll and / or a second shielding plate is provided in the region of the first crimping roll unit, and / or in the region of the second metering gap, a third shielding plate is provided in the region of the second adherend roll and / or a fourth shielding plate is provided in the region of the second crimping roll unit.

[0027] The masking sheet is used to prevent the powder from contacting the first crimping roll unit and / or the second crimping roll unit before the metering gap, or from adhering to the first coating roll and / or the second coating roll. At the same time, such a masking sheet can easily control the drawing of the powder into the first metering gap and / or the second metering gap. At the same time, in order to clean the first coating roll and / or the second coating roll and / or the first crimping roll unit and / or the second crimping roll unit, or to remove the adhering material, it is conceivable that they have a structure. This enables a clean deposition of the new first layer or second layer, or a clean transfer of the first layer and / or the second layer onto the substrate.

[0028] Furthermore, in the case of the coating device, it is conceivable that the first coating roll and / or the second coating roll and / or the first crimping roll unit and / or the second crimping roll unit are temperature-adjustable.

[0029] The above problems are further solved, in a second aspect of the present invention, by a method according to the present invention for manufacturing an electrode having at least one powder layer of a two-layer structure, particularly a cathode layer and / or an anode layer of a two-layer structure, on a substrate, particularly a current collector, in the coating device described above. This method comprises: · Supplying the substrate into the crimping gap by means of a supply unit; · Filling the first metering gap in parallel with the first powder and the second powder by means of a first metering unit; · In the first metering gap, causing the first powder and the second powder to be deposited as a first layer of at least a two-layer structure on the first crimping roll unit with a first adhesion force; · Transferring the first layer of at least a two-layer structure to the first side of the substrate in the first crimping gap with a crimping force. It has.

[0030] By simultaneously depositing the first powder and the second powder on the substrate as the first layer, the force applied to each of the individual powders of the layer can be reduced or they can be uniformly dispersed.

[0031] It is also conceivable that the second metering unit fills the second metering gap in parallel with the third powder and the fourth powder, and the third powder and the fourth powder are deposited on the second crimping roll unit by the second adhesion force as at least two-layered structures of the second layer in the second metering gap, and that the at least two-layered structure of the second layer is delivered to the second side of the substrate by the crimping force in the crimping gap.

[0032] The second metering unit and the second metering gap can also provide at least a two-layered powder layer on the second side of the substrate. Thus, in the case of electrode manufacturing, in one step, both the anode layer and the cathode layer can be deposited on the substrate or the current collector.

[0033] Within the framework of the present invention, optionally, the first metering unit can continuously fill the first metering gap and / or the second metering unit can continuously fill the second metering gap.

[0034] This leads to particularly uniform results when generating at least two-layered structures on each side of the substrate.

[0035] Furthermore, within the framework of the present invention, the first metering unit meters the first powder and the second powder such that in the case of the at least two-layered structure of the first layer, a first layer thickness of 40 to 150 μm is adjusted in the crimping gap, where it is assumed that the first layer consisting of the first powder has a layer thickness of 10 to 70 μm. Additionally or alternatively, the second metering unit meters the third powder and the fourth powder such that in the case of the at least two-layered structure of the second layer, a second layer thickness of 40 to 150 μm is adjusted in the crimping gap, where the first layer consisting of the third powder has a layer thickness of 10 to 70 μm.

[0036] This layer thickness or required material amount is set by a first or second metering unit and generated by a first adhesion force in the first metering gap or a second adhesion force in the second metering gap, and by a crimping force in the crimping gap. This can be controlled in open-loop and / or closed-loop by a control unit.

[0037] With regard to the present invention, it is conceivable to press a first layer with at least two layers in at least one first press gap of a first crimping roll unit, and / or press a second layer with at least two layers in at least one second press gap of a second crimping roll unit.

[0038] Pressing within each press gap causes compression of the first and / or second layers, thereby creating a denser packing of the at least two-layer powder layers on the first and / or second sides of the substrate. This allows for a reduction in the first and / or second adhesion force and / or compression force.

[0039] Furthermore, it is conceivable to adjust the temperature of the first adherend roll and / or the second adherend roll and / or the first crimping roll unit and / or the second crimping roll unit to 80°C to 150°C, particularly 100°C to 120°C.

[0040] This allows for improved adhesion of the first and second powders as the first layer to the first crimping roll unit, and / or improved adhesion of the third and fourth powders as the second layer to the second crimping roll unit. Furthermore, temperature control of the individual rolls can improve the transfer of the first layer to the first side of the substrate and / or the transfer of the second layer to the second side of the substrate, because the bonding of the individual powders in each layer is enhanced by heat.

[0041] In this case, it is also conceivable to adjust the temperature of the supply unit in order to preheat the substrate for delivery, that is, for pressing the first layer onto the first side of the substrate and / or pressing the second layer onto the second side of the substrate.

[0042] Within the framework of the present invention, advantageously, the first crimping roll unit and the second crimping roll unit face each other and rotate at the same first rotational speed, the ratio of the first rotational speed of the first crimping roll unit to the second rotational speed of the first roll to be applied is 10:1 to 10:4, preferably 10:1.5 to 10:3, and more preferably 10:2 to 10:3, and / or the ratio of the first rotational speed of the second crimping roll unit to the third rotational speed of the second roll to be applied is 10:1 to 10:4, preferably 10:1.5 to 10:3, and more preferably 10:2 to 10:3.

[0043] If the first crimping roll unit has a first crimping roll and a second crimping roll, and / or the second crimping roll unit has a third crimping roll and a fourth crimping roll, then the first rotational speed is effective as the rotational speed of the first crimping roll of the first crimping roll unit and the third crimping roll of the second crimping roll unit, because they form a crimping gap. In this case, the second crimping roll and the fourth crimping roll may each have a rotational speed different from the first rotational speed.

[0044] Here, it has been found that the ratio of rotational speeds is advantageous in that it leads to improved stability of the first layer or first at least two-layer powder layer on the electrode current collector, and / or the second layer or second at least two-layer powder layer on the electrode current collector.

[0045] The above-mentioned problems are further solved in a third aspect of the present invention by an electrode according to the present invention having a two-layer powder layer manufactured by the above-described coating apparatus and / or method, wherein the substrate is a current collector having a first side and a second side, and the first at least two-layer structure consists of a first powder and a second powder.

[0046] Within the framework of the present invention, it is conceivable that the second layer of at least two-layer structure consists of a third powder and a fourth powder.

[0047] Here, the electrode can be used as both an anode and a cathode. In this case, it is possible that the two-layer powder structure of the cathode is different from that of the anode. It is also possible that the current collector of the anode and the current collector of the cathode are different.

[0048] Such electrodes have an optimally compressed first layer of at least two layers and / or a second layer of at least two layers, the first layer of at least two layers and / or the second layer of at least two layers, and the latter does not contain a solvent. At the same time, electrodes manufactured in this manner have high conductivity and energy density.

[0049] A particularly good ratio of the use of the first, second, third, and fourth powders as materials for the electrode, or the first at least two-layer structure of the anode or cathode, and / or the second at least two-layer structure, to the existing conductivity is obtained when the first at least two-layer structure and the second at least two-layer structure have a layer thickness of 40 to 150 μm, where the first powder of the first layer and the third powder of the third layer have a layer thickness of 10 to 70 μm. This also improves the cost efficiency of material use.

[0050] The advantages described with respect to the coating apparatus of the first aspect of the present invention also apply to the method of the second aspect of the present invention and the electrode of the third aspect of the present invention.

[0051] Further advantages, features, and details of the present invention will become apparent from the following description. The following description details several embodiments of the present invention with reference to the drawings. In this application, the features described in the claims and specification can form the essence of the present invention individually or in any combination. The present invention is illustrated in the following drawings. [Brief explanation of the drawing]

[0052] [Figure 1] This diagram schematically shows a coating device for applying and transferring the first layer. [Figure 2] This diagram schematically shows a coating apparatus for applying and transferring the first and second layers. [Figure 3] This figure shows a portion of the first metering gap in Figure 1. [Figure 4] This figure schematically illustrates the method using the coating device shown in Figure 1. [Figure 5] This figure schematically illustrates the method using the coating device shown in Figure 2. [Figure 6] This is a schematic diagram showing the electrodes.

[0053] Figures 1 and 2 show a coating apparatus 10 for manufacturing an electrode 11 having at least one bilayer powder layer 12, in particular a bilayer cathode layer 13 and / or a bilayer anode layer 14, on a substrate 15, in particular a current collector 16. Here, Figure 1 shows a coating apparatus 10 for coating one side of the substrate 15 by adhering 130 and transferring 140 of at least one first bilayer powder layer 12, i.e., a first bilayer layer 27, and at least one second bilayer powder layer 12, i.e., a second bilayer layer 34, by adhering 130 and transferring 140.

[0054] Both the coating apparatus 10 in Figure 1 and the coating apparatus 10 in Figure 2 include a supply unit 17 that supplies a substrate 15 into a crimping gap 18, a first metering unit 19 that contains a first powder 20 and a second powder 21 and fills a first metering gap 22 in parallel with the first powder 20 and the second powder 21, and a roll equipment 23, the roll equipment 23 having a first adherend roll 24, a first crimping roll unit 25, and a second crimping roll unit 26.

[0055] Here, the first metering gap 22 is provided between the first adherend roll 24 and the first crimping roll unit 25, and the crimping gap 18 is provided between the first crimping roll unit 25 and the second crimping roll unit 26.

[0056] A first metering gap 22 is provided for adhering the first powder 20 and the second powder 21 to the first crimping roll unit 25 by a first adhesion force FA1 130 as a first at least two-layer structure 27. A crimping gap 18 is provided for transferring the first at least two-layer structure 27 from the first crimping roll unit 25 to the first side 28 of the supplied substrate 15 by a crimp force FP 140.

[0057] To enable the two-layer powder layer 12 to be adhered to the substrate 15 on both sides, the coating apparatus 10 in Figure 2 has a second metering unit 29 that contains a third powder 31 and a fourth powder 32 and fills a second metering gap 30 in parallel with the third powder 31 and the fourth powder 32. The roll equipment 23 additionally has at least one second adherend roll 33. The second metering gap 30 is provided between the second adherend roll 33 and the second crimping roll unit 26, and the second metering gap 30 is provided to adhere the third powder 31 and the fourth powder 32 to the second crimping roll unit 26 as a second at least two-layer layer 34 by a second adherend force FA2. In this case, the crimping gap 18 is also provided to transfer the second layer 34 of at least two layers from the second crimping roll unit 26 to the second side 35 of the supplied substrate 15 by a crimping force FP 140.

[0058] For example, as shown in Figure 2, the first crimping roll unit 25 has at least one first crimping roll 36 and at least one second crimping roll 37, with at least one first press gap 38 provided between the at least one first crimping roll 36 and the at least one second crimping roll 37. Additionally, the second crimping roll unit 26 has at least one third crimping roll 39 and at least one fourth crimping roll 40, with at least one second press gap 41 provided between the at least one third crimping roll 39 and the at least one fourth crimping roll 40.

[0059] Figure 3 shows an enlarged portion of the first metering gap 22 having a first metering unit 19. Here, the first metering unit 19 has a first separation plate 42 for separating the first powder 20 and the second powder 21 in the region of the first metering gap 22. Another separation plate may be similarly provided in the case of a second metering unit 29 and a second metering gap 30.

[0060] Furthermore, a portion shown in Figure 3 indicates that in the region of the first metering gap 22, the first shielding plate 44 is provided in the region of the first adherend roll 24, and / or the second shielding plate 45 is provided in the region of the first crimping roll unit 25. Similarly, in the region of the second metering unit 29 or the second metering gap 30, the third shielding plate 46 may be provided in the region of the second adherend roll 33, and / or the fourth shielding plate 47 may be provided in the region of the second crimping roll unit 26.

[0061] Figures 4 and 5 schematically illustrate a method 100 for manufacturing an electrode 11 having at least one bilayer powder layer 12, in particular a bilayer cathode layer 13 and / or a bilayer anode layer 14, on a substrate 15, particularly a current collector 16, using the coating apparatus 10 shown in Figure 1 or Figure 2: • The supply unit 17 supplies the base material 15 into the crimping gap 18; - The first metering unit 19 fills the first metering gap 22 in parallel with the first powder 20 and the second powder 21 120; In the first metering gap 22, the first powder 20 and the second powder 21 are applied to the first crimping roll unit 25 as a first layer 27 with at least two layers, by the first adhesion force FA1 130; - A first layer 27 with at least two layers is transferred to the first side 28 of the base material 15 by a compressive force FP in the first compressive gap 18.

[0062] In the method 100 shown in Figure 5, which is carried out in the coating apparatus 10 shown in Figure 2, the second metering unit 29 fills the second metering gap 30 in parallel with the third powder 31 and the fourth powder 32 120. Here, the third powder 31 and the fourth powder 32 are adhered to the second crimping roll unit 26 in the second metering gap 30 by a second adhesion force FA2 as a second at least two-layer structure 34 130, and then the two at least two-layer structure 34 are delivered to the second side 35 of the substrate 15 in the crimping gap 18 by a crimping force FP 140.

[0063] Here, for both embodiments of the coating device 10 or method 100, the first metering unit 19 in Figures 1 and 2 or Figures 4 and 5 continuously fills the first metering gap 22 120, and the second metering unit 29 in Figure 2 or Figure 5 continuously fills the second metering gap 30 120.

[0064] Here, the first metering unit 19 meters the first powder 20 and the second powder 21 so that, in the case of the first layer 27 with at least two layers, the first layer 48 consisting of the first powder 20 has a layer thickness SP1 of 10 to 70 μm in the crimping gap 18, and the same applies to the second metering unit 29, which meters the third powder 31 and the fourth powder 32 so that, in the case of the second layer 34 with at least two layers, the second layer 49 consisting of the third powder 31 has a layer thickness SP3 of 10 to 70 μm in the crimping gap 18, and the third layer 49 consisting of the third powder 31 has a layer thickness SP3 of 10 to 70 μm.

[0065] As already described above, the coating device 10 shown in Figure 2 has a first crimping roll 36 and a second crimping roll 37 in the first crimping roll unit 25, and a third crimping roll 39 and a fourth crimping roll 40 in the second crimping roll unit 26.

[0066] Therefore, in this case, the first layer 27 with at least two layers is pressed in at least one first press gap 38 of the first crimping roll unit 25 150, and the second layer 34 with at least two layers is pressed in at least one second press gap 41 of the second crimping roll unit 26 150.

[0067] For optimal adhesion and delivery, in the coating apparatus 10 shown in Figure 2, and in the method 100 shown in Figure 5, the first adhesion roll 24 and the second adhesion roll 33 and the first crimping roll unit 25 and the second crimping roll unit 26 are temperature-controlled to a temperature of 80°C to 150°C 160. In this case, each roll can be temperature-controlled to a specific temperature 160.

[0068] In method 100 shown in Figures 4 and 5, the first crimping roll unit 25 and the second crimping roll unit 26 face each other and rotate at the same first rotational speed v1. In this case, the ratio of the first rotational speed v1 of the first crimping roll unit 25 to the second rotational speed v2 of the first work-on roll 24 is 10:1 to 10:4. In method 100 shown in Figure 5, a second work-on roll 33 is provided, and here, the ratio of the first rotational speed v1 of the second crimping roll unit 26 to the third rotational speed v3 of the second work-on roll 33 is 10:1 to 10:4.

[0069] However, in method 100 shown in Figure 5, the second rotational speed v2 of the first adherend roll 24 does not have to correspond to the third rotational speed v3 of the second adherend roll 33. In method 100 shown in Figure 5, using the coating device 10 shown in Figure 2, the first rotational speed v1 is the rotational speed of the first crimping roll 36 of the first crimping roll unit 25 and the third crimping roll 39 of the second crimping roll unit 26. This is because these form the crimping gap 18. In this case, the second crimping roll 37 and the fourth crimping roll 40 may have rotational speeds different from the first rotational speed v1.

[0070] Figure 6 shows an electrode 11 manufactured in the coating apparatus 10 shown in Figure 2 and the method 100 shown in Figure 5, the electrode 11 having a first two-layer powder layer 12 and a second two-layer powder layer 12 on a substrate 15. Here, the substrate 15 is a current collector 16 having a first side 28 and a second side 35, the first at least two-layer layer 27, i.e., the first two-layer powder layer 12, consists of a first powder 20 and a second powder 21. Furthermore, the second at least two-layer layer 34, i.e., the second two-layer powder layer 12, consists of a third powder 31 and a fourth powder 32. Here, the anode layer 14 has a first layer thickness SD1, the cathode layer 13 has a second layer thickness SD2 of 40-150 μm, the first powder 20 of the first layer 48 has a first layer thickness SP1 of 10-70 μm, and the third powder 31 of the third layer 49 has a third layer thickness SP3 of 10-70 μm. This also improves the cost efficiency of material usage. [Explanation of Symbols]

[0071] 10 Coating device 11 electrodes 12. Two-layer powder layer 13 Cathode Layer 14 Anode Layer 15 Base material 16 Current collector 17 Supply Units 18 Crimping gap 19. First metering unit 20 First powder 21 Second powder 22 First metering gap 23 Roll equipment 24 First attachment roll 25 First crimping roll unit 26. Second crimping roll unit 27 The first layer of the two-layer structure 28 First side 29. Second metering unit 30. Second metering gap 31 The third powder 32 The fourth powder 33. Second attachment roll 34. The second layer of the two-layer structure 35 The second side 36 First crimping roll 37. Second crimping roll 38 First press gap 39 Third crimping roll 40. Fourth crimping roll 41. Second press gap 42 First Separation Thin Plate 43 Second separation plate 44 First shielding plate 45. Second shielding plate 46 Third shielding plate 47. Fourth shielding plate 48. The first layer 49. The third layer 100 ways 110 supply 120 Parallel filling 130 Adherence 140 Handover 150 Press 160 Temperature adjustment FA1 First point of contact FP crimping force FA2 Second point of contact SD1 First layer thickness SD2 Second layer thickness SP1 Thickness of the first layer SP3 Thickness of the third layer v1 First rotation speed v2 Second rotation speed v3 Third rotation speed

Claims

1. A coating apparatus (10) for manufacturing an electrode (11) having at least one two-layer powder layer (12) on a substrate (15), The coating device (10) is A supply unit (17) that supplies (110) a base material (15) into the crimping gap (18), A first metering unit (19) contains a first powder (20) and a second powder (21), and fills a first metering gap (22) in parallel with the first powder (20) and the second powder (21) (120), Roll equipment (23) and It has, The aforementioned roll equipment (23) includes a first workpiece roll (24), a first crimping roll unit (25), and a second crimping roll unit (26). The first metering gap (22) is provided between the first adherend roll (24) and the first crimping roll unit (25), and the crimping gap (18) is provided between the first crimping roll unit (25) and the second crimping roll unit (26). The first metering gap (22) is provided to adhere the first powder (20) and the second powder (21) to the first crimping roll unit (25) by a first adhesion force (FA1) (130) as a first at least two-layer structure (27). The crimping gap (18) is provided to transfer (140) the first at least two-layer structure (27) from the first crimping roll unit (25) to the first side (28) of the supplied substrate (15) by crimping force (FP), In the region of the first metering gap (22), the first shielding plate (44) is provided in the region of the first adherend roll (24), and / or the second shielding plate (45) is provided in the region of the first crimping roll unit (25). Coating device (10).

2. A second metering unit (29) is provided, which contains a third powder (31) and a fourth powder (32), and fills a second metering gap (30) in parallel with the third powder (31) and the fourth powder (32) (120). The aforementioned roll equipment (23) has at least one second roll to be attached (33), A second metering gap (30) is provided between the second adherend roll (33) and the second crimping roll unit (26). The second metering gap (30) is provided to adhere the third powder (31) and the fourth powder (32) to the second crimping roll unit (26) by a second adhesion force (FA2) (130) as a second at least two-layer structure (34). The crimping gap (18) is provided to transfer (140) the second at least two-layer structure (34) from the second crimping roll unit (26) to the second side (35) of the supplied substrate (15) by crimping force (FP). The coating apparatus (10) according to claim 1.

3. The first crimping roll unit (25) comprises at least one first crimping roll (36) and at least one second crimping roll (37), wherein at least one first press gap (38) is provided between the at least one first crimping roll (36) and the at least one second crimping roll (37), and / or The second crimping roll unit (26) has at least one third crimping roll (39) and at least one fourth crimping roll (40), and at least one second press gap (41) is provided between the at least one third crimping roll (39) and the at least one fourth crimping roll (40). The coating apparatus (10) according to claim 1.

4. The first metering unit (19) has a first separation plate (42) for separating the first powder (20) and the second powder (21) in the region of the first metering gap (22). The coating apparatus (10) according to claim 1.

5. The coating apparatus (10) according to claim 2, wherein the second metering unit (29) has a second separating plate (43) for separating the third powder (31) and the fourth powder (32) in the region of the second metering gap (30).

6. The coating apparatus (10) according to claim 2, wherein in the region of the second metering gap (30), a third shielding thin plate (46) is provided in the region of the second adherend roll (33), and / or a fourth shielding thin plate (47) is provided in the region of the second crimping roll unit (26).

7. A method (100) for manufacturing an electrode (11) having at least one two-layer powder layer (12) on a substrate (15) using a coating apparatus (10) according to claim 1, wherein the method (100) is: The steps include supplying the substrate (15) into the crimping gap (18) by the supply unit (17) (110), Step (120) of filling the first metering gap (22) with the first powder (20) and the second powder (21) in parallel using the first metering unit (19), In the first metering gap (22), the first powder (20) and the second powder (21) are applied to the first crimping roll unit (25) as a first layer (27) with a first adhesion force (FA1), (130) Step (140) of transferring the first at least two-layer structure (27) to the first side (28) of the substrate (15) by a compressive force (FP) in the first compression gap (18), A method (100) having the following characteristics.

8. A method (100) for manufacturing an electrode (11) having at least one two-layer powder layer (12) on a substrate (15) using a coating apparatus (10) according to claim 2, wherein the method (100) is: The steps include supplying the substrate (15) into the crimping gap (18) by the supply unit (17) (110), Step (120) of filling the first metering gap (22) with the first powder (20) and the second powder (21) in parallel using the first metering unit (19), In the first metering gap (22), the first powder (20) and the second powder (21) are applied to the first crimping roll unit (25) as a first layer (27) with a first adhesion force (FA1), (130) Step (140) of transferring the first at least two-layer structure (27) to the first side (28) of the substrate (15) by a compressive force (FP) in the first compression gap (18), Step (120) of filling the second metering gap (30) with the third powder (31) and the fourth powder (32) in parallel using the second metering unit (29), Step (130) of applying the third powder (31) and the fourth powder (32) as a second layer (34) with a second adhesion force (FA2) to the second crimping roll unit (26) in the second metering gap (30), Step (140) of transferring the second layer (34) of the substrate (15) to the second side (35) by the pressing force (FP) in the pressing gap (18), A method (100) having the following characteristics.

9. The method (100) according to claim 7, wherein the first metering unit (19) continuously fills the first metering gap (22) (120).

10. The method (100) according to claim 8, wherein the second metering unit (29) continuously fills the second metering gap (30) (120).

11. The first metering unit (19) meters the first powder (20) and the second powder (21) such that, in the case of the first at least two-layer structure layer (27), the first layer (48) consisting of the first powder (20) has a layer thickness (SP1) of 10 to 70 μm. The method (100) according to claim 7.

12. The method (100) according to claim 8, wherein the second metering unit (29) meters the third powder (31) and the fourth powder (32) such that, in the case of the second at least two-layer structure layer (34), the second layer (SD2) in the crimping gap (18) is adjusted to a second layer thickness (SD2) of 40 to 150 μm, and the first layer (49) consisting of the third powder (31) has a layer thickness (SP3) of 10 to 70 μm.

13. The first layer (27) having at least two layers is pressed (150) in at least one first press gap (38) of the first crimping roll unit (25). The method (100) according to claim 7.

14. The method (100) according to claim 8, wherein the second at least two-layer structure (34) is pressed (150) in at least one second press gap (41) of the second crimping roll unit (26).

15. The method (100) according to claim 7, wherein the temperature of the first adherend roll (24) and / or the first crimping roll unit (25) is adjusted to a temperature of 80°C to 150°C (160).

16. The method (100) according to claim 8, wherein the second adherend roll (33) and / or the second crimping roll unit (26) are temperature-controlled to a temperature of 80°C to 150°C (160).

17. The method (100) according to claim 8, wherein the first crimping roll unit (25) and the second crimping roll unit (26) face each other and rotate at the same first rotational speed (v1), the ratio of the first rotational speed (v1) of the first crimping roll unit (25) to the second rotational speed (v2) of the first work-to-be-roll (24) is 10:1 to 10:4, and / or the ratio of the first rotational speed (v1) of the second crimping roll unit (26) to the third rotational speed (v3) of the second work-to-be-roll (33) is 10:1 to 10:

4.

18. The coating apparatus (10) according to claim 1, wherein the first shielding thin plate (44) and / or the second shielding thin plate (45) have a structure for cleaning the first adherend roll (24) and / or the first crimping roll unit (25).

19. The coating apparatus (10) according to claim 6, wherein the third shielding plate (46) and / or the fourth shielding plate (47) have a structure for cleaning the second adherend roll (33) and / or the second crimping roll unit (26).

20. The coating apparatus (10) according to claim 4, wherein the first separating plate (42) has a structure that combs out the first powder (20) and / or the second powder (21), and / or the first separating plate (42) is vibratable by electrical and / or pneumatic excitation.

21. The coating apparatus (10) according to claim 5, wherein the second separating plate (43) has a structure that combs out the third powder (31) and / or the fourth powder (32), and / or the second separating plate (43) is vibratable by electrical and / or pneumatic excitation.

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