Electrode manufacturing apparatus comprising die for forming insulating layer

Abstract

The present invention provides an electrode manufacturing apparatus comprising: a coater roller arranged to support an electrode sheet material; a moving space part in which the electrode sheet material is moved by rotation of the coater roller; and an insulating layer forming die installed on a movement path of the electrode sheet material, wherein the insulating layer forming die includes: a nozzle part for spraying an insulating liquid onto the electrode sheet material; a first angle adjustment part for adjusting an angle of the nozzle part in the direction of movement of the electrode sheet material; a second angle adjustment part for adjusting an angle of the nozzle part in a direction perpendicular to the direction of movement of the electrode sheet material; and an azimuth angle adjustment part formed in an arc shape around a rotation axis of the coater roller and capable of moving the position of the nozzle part along the arc.

Description

Electrode manufacturing device including a die for forming an insulating layer The present invention relates to an electrode manufacturing device including a die for forming an insulating layer. With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries are widely used as energy sources for various mobile devices as well as various electronic products due to their high energy density and operating voltage and excellent preservation and life characteristics. One of the main research tasks in these secondary batteries is to improve safety. The main cause of safety-related accidents in batteries is due to abnormal high temperature conditions reached due to short circuits between the positive and negative electrodes. In other words, under normal circumstances, a separator is located between the positive and negative electrodes to maintain electrical insulation. However, in abnormal misuse situations such as overcharge or overdischarge of the battery, internal short circuits caused by dendritic growth of electrode materials or foreign substances, sharp objects such as nails or screws penetrating the battery, or excessive deformation of the battery due to external force, the existing separator alone shows its limitations. In addition, the separator mainly using a microporous membrane made of polyolefin resin has insufficient heat resistance as its heat resistance temperature is about 120 to 160℃. Therefore, when an internal short circuit occurs, there is a problem that the separator shrinks due to the short circuit reaction heat, the short circuit area expands, and a thermal runaway state occurs in which a larger amount of reaction heat is generated. Therefore, in order to maintain the insulation of the battery electrode and reduce the possibility of a short circuit between the positive and negative electrodes, an insulating layer is coated on the electrode, generally a portion of the positive electrode. For example, the insulating layer may be formed to partially overlap a terminal portion of the active material layer and a portion (non-conductive portion) of the electrode current collector where the active material layer is not formed, which may improve safety by preventing the positive tab portion and the negative electrode from directly contacting each other when the separator shrinks due to abnormally high temperature. At this time, the active material layer may be formed so that the terminal portion has an inclined portion toward the current collector due to the viscosity characteristics of the electrode slurry. The above-mentioned insulating layer is formed by spraying an insulating liquid at a target location, and the spraying of the insulating liquid can be performed through an insulating layer forming die. The existing insulating layer forming die is fixedly positioned in consideration of the target insulating layer formation location, thickness, etc. At this time, the selection of an appropriate position of the insulating layer forming die is an important issue. For example, if the distance between the active material layer and the insulating layer forming die is too close, a scratch phenomenon may occur at the active material layer application portion, and if the distance between the active material layer and the insulating layer forming die is widened to prevent this, the thickness of the formed insulating layer may become too thick, and there is a concern that the insulating layer may swell due to the electrolyte, causing a change in shape such as bending of the electrode shape, or a detachment phenomenon of the insulating layer. In particular, considering that a slope may be formed at the end of the active material layer due to the viscosity characteristics of the electrode slurry, the above-mentioned problem cannot be solved through the existing insulating layer forming die. Accordingly, there is an urgent need to develop a die for forming an insulating layer to form a thin and uniform insulating layer at the target location of the electrode. One object of the present invention is to solve the above problems, and to provide an electrode manufacturing device in which an insulating layer forming die capable of adjusting the position and angle of a nozzle portion without damaging an active material layer is installed in an electrode manufacturing device, thereby significantly preventing scratches on the active material layer, uneven thickness of the formed insulating layer, and changes in electrode shape due to thickening of the insulating layer. [1] The present invention provides an electrode manufacturing device including a coater roller arranged to support an electrode sheet material; a moving space portion in which the electrode sheet material is moved by rotation of the coater roller; and an insulating layer forming die installed on a moving path of the electrode sheet material, wherein the insulating layer forming die includes a nozzle portion for spraying an insulating liquid onto the electrode sheet material, a first angle adjusting portion for adjusting an angle of the nozzle portion in a moving direction of the electrode sheet material, a second angle adjusting portion for adjusting an angle of the nozzle portion in a direction perpendicular to the moving direction of the electrode sheet material, and an azimuth adjusting portion formed to draw an arc centered on the rotational axis of the coater roller and capable of moving a position of the nozzle portion along the arc. [2] The present invention provides an electrode manufacturing device in which, in the above [1], the die for forming the insulating layer is installed spaced apart from the electrode sheet material. [3] The present invention provides an electrode manufacturing device, wherein in at least one of the above [1] to [2], the electrode manufacturing device further includes a position adjusting unit for adjusting the position of the die for forming the insulating layer. [4] The present invention provides an electrode manufacturing device including at least one of the following: at least one of [1] to [3], wherein the position adjusting unit comprises: a first linear guide formed along a moving direction of the electrode sheet material; a second linear guide formed along a direction perpendicular to the moving direction of the electrode sheet material; and a third linear guide for adjusting a position of the die for forming an insulating layer in the height direction. [5] The present invention provides an electrode manufacturing device in which, in one or more of the above [1] to [4], the electrode sheet material includes a current collector and an active material layer arranged on at least a portion of the current collector surface, and the nozzle part has a position and angle adjusted to spray an insulating liquid onto the active material layer. [6] The present invention provides an electrode manufacturing device in which, in at least one of the above [1] to [5], the active material layer includes an inclined portion inclined toward the current collector at least at one end and a flat portion partitioned excluding the inclined portion, and the nozzle portion adjusts the spraying position and angle of an insulating liquid so that an insulating layer is formed on at least a part of the inclined portion. [7] The present invention provides an electrode manufacturing device in which, in at least one of the above [1] to [6], the current collector includes a non-conductive portion adjacent to the inclined portion and on which an active material layer is not formed, and the nozzle portion adjusts the spray position and angle of an insulating liquid so that an insulating layer is continuously formed over at least a portion of the inclined portion and at least a portion of the non-conductive portion. [8] The present invention provides an electrode manufacturing device in which, in one or more of the above [1] to [7], the insulating layer forming die is plural, and the plurality of insulating layer forming dies are sequentially arranged in the direction of movement of the electrode sheet material. [9] The present invention provides an electrode manufacturing device in which each nozzle part included in the plurality of insulating layer forming dies in one or more of the above [1] to [8] is adjusted in position and angle to form two or more insulating layers.

[0010] The present invention provides an electrode manufacturing device, wherein in at least one of the above [1] to [9], the electrode manufacturing device further includes a drying unit positioned behind the spraying position of the nozzle unit based on the moving direction of the electrode sheet material. An electrode manufacturing device according to the present invention includes an insulating layer forming die, wherein the insulating layer forming die includes an angle adjusting portion (a first angle adjusting portion and a second angle adjusting portion) for adjusting a spraying angle of a nozzle portion, and an azimuth adjusting portion for adjusting a position of the nozzle portion to be orthogonal to the rotational axis of the coater roller. Through this, the distance between the nozzle portion of the insulating layer forming die and the position where the insulating liquid is applied can be minimized at a level where scratches or pushing of the active material layer do not occur, and the insulating layer can be formed thinly and uniformly, thereby enabling the implementation of an electrode having excellent quality. Figure 1 is a schematic diagram for explaining an electrode manufacturing device according to an embodiment of the present invention. FIG. 2 is a plan view for explaining the positions of a coater roller and an azimuth adjustment unit in an electrode manufacturing device according to an embodiment of the present invention. Figure 3 is a schematic diagram for explaining a conventional electrode manufacturing device. First, before describing the present invention, it should be noted that the terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best manner. Meanwhile, the terms used in this specification are only used to describe exemplary embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, it should be understood that the terms “comprise,” “include,” or “have” are intended to specify the presence of a feature, number, step, component, or combination thereof, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof. Hereinafter, the electrode manufacturing device of the present invention will be described in detail with reference to the drawings. When adding reference symbols to components in each drawing, the same components may have the same symbols as much as possible even if they are shown in different drawings. In addition, when describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted. Electrode manufacturing device The present invention relates to an electrode manufacturing device, and more particularly, to an electrode manufacturing device for a lithium secondary battery. Specifically, referring to FIG. 1, the electrode manufacturing device according to one embodiment of the present invention comprises: a coater roller (10) arranged to support an electrode sheet material (20); a moving space portion (30) through which the electrode sheet material (20) moves by rotation of the coater roller (10); And it includes an insulating layer forming die (40) installed on the movement path of the electrode sheet material (20); and the insulating layer forming die (40) is characterized by including a nozzle part (41) for spraying an insulating liquid onto the electrode sheet material (20), a first angle adjusting part (42) for adjusting the angle of the nozzle part (41) in the movement direction of the electrode sheet material (20), a second angle adjusting part (43) for adjusting the angle of the nozzle part (41) in a direction perpendicular to the movement direction of the electrode sheet material (20), and an azimuth adjusting part (44) formed to draw an arc centered on the rotation axis of the coater roller (10) and capable of moving the position of the nozzle part (41) along the arc. The above-mentioned coater roller (10) is arranged to support the electrode sheet material (20). The above-mentioned coater roller (10) may be a cylindrical roller as shown in FIG. 1, and the electrode sheet material (20) may be transmitted in the moving direction (Machine direction, MD) of the electrode sheet material (20) according to the rotation of the coater roller (10). The above electrode sheet material (20) may be in a sheet form. Specifically, although not shown in FIG. 1, the electrode sheet material may be transferred to the coater roller when the electrode roll on which the electrode sheet material is wound is unwound, and the coater roller supports the transferred electrode sheet material, and the electrode sheet material may be moved in the direction of movement of the electrode sheet material by the rotation of the coater roller. The above electrode sheet material (20) may be a positive electrode sheet material or a negative electrode sheet material, and specifically, may be a positive electrode sheet material. The above electrode sheet material (20) may include a current collector (21) and an active material layer (22) arranged on at least a portion of the surface of the current collector (21). The active material layer (22) may be arranged on one or both sides of the current collector (21). The nozzle unit (41) described below may have its position and angle adjusted to spray an insulating liquid onto the active material layer (22). Specifically, the active material layer (22) may include at least one inclined portion (221) that is inclined toward the current collector (21) and a flat portion (222) that is partitioned excluding the inclined portion (221). The inclined portion (221) may be formed by the viscosity characteristics of the electrode slurry for forming the active material layer (22). At this time, the insulating layer (50) described below may be formed by being applied to at least a portion of the inclined portion (221). Alternatively, the nozzle portion (41) described below may be adjusted to have the spraying position and angle of the insulating liquid adjusted so that the insulating layer is formed on at least a portion of the inclined portion (221). In addition, the current collector (21) may further include a non-conductive portion adjacent to the inclined portion (221) on which the active material layer (22) is not formed. At this time, the insulating layer (50) described later may be continuously formed over at least a portion of the inclined portion (221) and at least a portion of the non-conductive portion. Alternatively, the nozzle portion (41) described later may be adjusted to have a spraying position and angle of the insulating liquid so that the insulating layer (50) is continuously formed over at least a portion of the inclined portion (221) and at least a portion of the non-conductive portion. As the above electrode sheet material (20), current collector (21), and active material layer (22), any materials or components known in the art can be used without limitation. The current collector is not particularly limited as long as it has high conductivity without causing a chemical change in the battery. Specifically, the current collector may include at least one selected from the group consisting of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, and an aluminum-cadmium alloy. For example, when the electrode or the active material layer is a positive electrode or a positive electrode active material layer, the current collector may include aluminum, and when the electrode or the active material layer is a negative electrode or a negative electrode active material layer, the current collector may include copper. The current collector may be used in various forms such as a film, a sheet, a foil, a net, a mesh, a porous body, a foam, a non-woven fabric, etc. In addition, the current collector may include a polymer layer and a metal layer disposed on both sides of the polymer layer, and the metal layer may include at least one selected from the group consisting of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and an aluminum-cadmium alloy. The active material layer (22) may include an active material. Specifically, when the active material is a negative electrode active material, for example, a compound capable of reversible intercalation and deintercalation of lithium can be used as the negative electrode active material (electrode active material) included therein. Specific examples of the negative electrode active material include carbonaceous materials such as artificial graphite, natural graphite, graphitized carbon fiber, and amorphous carbon; metallic compounds capable of alloying with lithium such as Si, Al, Sn, Pb, Zn, Bi, In, Mg, Ga, Cd, Si alloy, Sn alloy, or Al alloy; SiO β (0 < β < 2), SnO2, vanadium oxide, lithium vanadium oxide, and other metal oxides capable of doping and dedoping lithium; or composites containing the above metal compounds and carbonaceous materials, such as Si-C composites or Sn-C composites, and one or a mixture of two or more of these may be used. In addition, a metallic lithium thin film may be used as the negative electrode active material. In addition, both low-crystalline carbon and high-crystalline carbon may be used as the carbon material. Representative examples of low-crystallization carbon include soft carbon and hard carbon, and representative examples of high-crystallization carbon include amorphous, plate-like, flaky, spherical or fibrous natural or artificial graphite, Kish graphite, pyrolytic carbon, mesophase pitch-based carbon fiber, mesophase pitches, mesophase pitches, and high-temperature calcined carbon such as petroleum or coal tar pitch derived cokes. In addition, specifically, when the active material is a cathode active material, the cathode active material (electrode active material) is not particularly limited, and cathode active materials known in the art can be used without limitation. Specifically, the cathode active material is a layered compound such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), or a compound substituted with one or more transition metals; lithium iron oxide such as LiFe3O4; chemical formula Li 1+c1 Mn 2-c1 Lithium manganese oxides such as O4(0≤c1≤0.33), LiMnO3, LiMn2O3, LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, Cu2V2O7; chemical formula LiNi 1-c2 M c2 Ni-site type lithium nickel oxide represented by O2 (wherein, M is at least one selected from the group consisting of Co, Mn, Al, Cu, Fe, Mg, B, and Ga, and satisfies 0.01≤c2≤0.3); chemical formula LiMn 2-c3 M c3 Lithium manganese composite oxide represented by O2 (wherein, M is at least one selected from the group consisting of Co, Ni, Fe, Cr, Zn, and Ta, and satisfies 0.01≤c3≤0.1) or Li2Mn3MO8 (wherein, M is at least one selected from the group consisting of Fe, Co, Ni, Cu, and Zn); LiMn2O4, etc. in which a part of the Li in the chemical formula is replaced with an alkaline earth metal ion, but the present invention is not limited thereto. The above active material layer may optionally further include a binder, a conductive agent, and / or a thickener in addition to the above active material. The above binders include polyvinylidene fluoride polymers, polyvinyl alcohol, styrene butadiene rubber, polyethylene oxide, carboxyl methyl cellulose, cellulose acetate, cellulose acetate butylate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinylalcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, and polyvinylpyrrolidone. The binder polymer may be any one binder polymer selected from the group consisting of polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyarylate, and low molecular weight compounds having a molecular weight of 10,000 g / mol or less, or a mixture of two or more of these. The conductive material is not particularly limited as long as it is conductive and does not cause a chemical change in the battery, and for example, graphite such as natural graphite or artificial graphite; carbon black such as carbon black, acetylene black, Ketjen black, channel black, paneth black, lamp black, thermal black, etc.; conductive fibers such as carbon fibers or metal fibers; conductive tubes such as carbon nanotubes; metal powders such as fluorocarbon, aluminum, and nickel powder; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc. can be used. An example of the above thickener is carboxymethyl cellulose (CMC). The above active material layer can be manufactured by adding an active material, optionally a binder, a conductive agent, a thickener, etc. to a solvent to manufacture an active material slurry, and then applying, drying, and rolling the active material slurry onto a current collector. Water, NMP, etc. can be used as the solvent. When forming an active material layer (22) on the electrode sheet material (20), the electrode manufacturing device may further include an active material layer forming die (not shown). The active material layer forming die may spray or discharge an active material slurry. The active material layer forming die may be installed in a moving space portion (30) so as to be spaced apart from the electrode sheet material (20). The spraying of the active material slurry of the active material layer forming die and the spraying of the insulating liquid of the insulating layer forming die, which will be described later, may be performed substantially simultaneously or at different times. Specifically, the active material slurry of the active material layer forming die may be sprayed at a target location, and then the insulating liquid of the insulating layer forming die may be sprayed. Alternatively, the active material slurry of the active material layer forming die may be sprayed at a target location, and then the insulating liquid of the insulating layer forming die may be sprayed at a target location and then the insulating liquid of the insulating layer forming die may be sprayed at a substantially same time. The above moving space (30) is provided as a place where the electrode sheet material (20) is moved by the rotation of the coater roller (10). Specifically, the moving space (30) provides a moving path (MD) along which the electrode sheet material (20) is moved by the rotation of the coater roller (10). As illustrated in FIG. 1, the moving space portion (30) may include one or more support rollers (31) arranged along the moving direction (MD) of the electrode sheet material (20). The support rollers (31) may serve to support the electrode sheet material (20) so that the electrode sheet material (20) can be easily transported along the moving direction. Alternatively, the support rollers (31) may serve to change the moving path of the electrode sheet material (20) to a desired position. The die (40) for forming the insulating layer may be provided for the purpose of forming an insulating layer by spraying an insulating liquid on the electrode sheet material (20). The die (40) for forming the insulating layer is installed on the movement path of the electrode sheet material (20). Specifically, the die (40) for forming the insulating layer may be installed spaced apart from the electrode sheet material (20). In addition, the die (40) for forming the insulating layer may be installed spaced apart from the coater roller (10) by a predetermined distance. More specifically, the die (40) for forming the insulating layer may be arranged such that the nozzle portion (41) (discharge port) of the die (40) is spaced apart from the coater roller (10) and is orthogonal to the rotational axis (r) of the coater roller (10). This orthogonal arrangement may be implemented through the first angle adjusting portion (42), the second angle adjusting portion (43), and the azimuth adjusting portion (44) described below. Specifically, the die (40) for forming the insulating layer includes a nozzle part (41) that sprays an insulating liquid onto the electrode sheet material (20), a first angle adjusting part (42) that adjusts an angle of the nozzle part (41) in a direction in which the electrode sheet material (20) moves, a second angle adjusting part (43) that adjusts an angle of the nozzle part (41) in a direction perpendicular to the direction in which the electrode sheet material (20) moves, and an azimuth adjusting part (44) that is formed to draw an arc around the rotational axis of the coater roller (10) and can move the position of the nozzle part (41) along the arc. For example, FIG. 3 illustrates a conventional electrode manufacturing device. In the conventional electrode manufacturing device, an insulating layer forming die (40') is fixedly placed on a coater roller (10) or an electrode sheet material (20) while being spaced apart. Referring to FIG. 3, in terms of the distance between the nozzle portion of the insulating layer forming die (40') and the application position, if the distance between the nozzle portion of the insulating layer forming die (40') and the application position is too close, the discharge amount of the insulating liquid can be minimized, but there is a problem that the structure of the nozzle portion or the insulating layer forming die scratches or pushes away the adjacent active material layer, which causes structural damage to the active material layer and causes poor quality of the electrode. In particular, the step between the active material layer and the current collector is about 100 to 500 ㎛, so it is very difficult for the insulating layer forming die (40') to spray the insulating liquid without damaging the active material layer. Meanwhile, if the distance between the nozzle part of the die (40') for forming the insulating layer and the application position is too far, the problem occurs that the amount of insulating liquid discharged is excessive and the insulating layer is formed thickly. This may cause the insulating layer to swell due to the electrolyte, resulting in changes in the shape of the electrode, such as warping, or detachment of the insulating layer. Meanwhile, in terms of the angle between the nozzle part of the die (40') for forming the insulating layer and the application position, it is important to adjust the position of the nozzle part to be orthogonal to the rotational axis of the coater roller (10). For example, if the spraying direction of the nozzle part is not orthogonal to the rotational axis of the coater roller (10) but is tilted, the active material layer may be scratched in a part where the distance between the nozzle part and the coater roller (10) is close, and the thickness of the insulating layer may become uneven or the processability may deteriorate in a part where the distance between the nozzle part and the coater roller (10) is far. Therefore, in order to solve the above-mentioned problem, the electrode manufacturing device according to the present invention includes an insulating layer forming die (40), and the insulating layer forming die (40) is characterized by including an angle adjusting unit (a first angle adjusting unit (42) and a second angle adjusting unit (43)) for adjusting the spraying angle of the nozzle unit (41) and an azimuth adjusting unit (44) for adjusting the position of the nozzle unit (41) to be orthogonal to the rotational axis of the coater roller (10). Through this, the distance between the nozzle unit (41) of the insulating layer forming die (40) and the application position of the insulating liquid can be minimized at a level where scratching or pushing of the active material layer does not occur, and the insulating layer can be formed thinly and uniformly, thereby enabling the implementation of an electrode having excellent quality. In addition, according to the electrode manufacturing device of the present invention, the position and angle of the nozzle part (41) can be easily and precisely adjusted so that an insulating layer can be formed at a desired location, and accordingly, an insulating layer can be formed with a thin and uniform thickness, so that the amount of insulating liquid used to form the insulating layer is significantly reduced, which is also advantageous in terms of cost reduction. The above nozzle part (41) may be provided as a place where the insulating liquid is sprayed or discharged. The nozzle part (41) may include a discharge port through which the insulating liquid is dispersed and a discharge path for transporting the insulating liquid to the discharge port. The spraying method of the above nozzle part (41) may be selected from thermal spray, compressed air spray, ultrasonic spray, etc., but is not limited thereto. The first angle adjustment unit (42) adjusts the angle of the nozzle unit (41) in the moving direction of the electrode sheet material (20) (Machine direction, MD); or the longitudinal direction of the electrode sheet material (20); and the second angle adjustment unit (43) adjusts the angle of the nozzle unit (41) in the direction perpendicular to the moving direction of the electrode sheet material (20) (Transverse direction, TD); or the width direction of the electrode sheet material (20). For example, when an insulating layer is to be formed over the inclined portion of the active material layer formed at the electrode end and the uncoated portion of the current collector, the spraying angle of the nozzle unit (41) can be adjusted through the first and second angle units so that the spraying direction of the nozzle unit (41) is directed toward the inclined portion. In addition, the azimuth adjustment part (44) is formed to draw an arc centered on the rotation axis of the coater roller (10). Accordingly, the position of the nozzle part (41) can be moved along an arc centered on the rotation axis. The above-described azimuth adjustment unit (44) can adjust the position of the nozzle unit (41) to be orthogonal to the rotation axis of the coater roller (10) according to the above-described feature. Accordingly, the distance between the nozzle unit (41) of the insulating layer forming die (40) and the application position of the insulating liquid can be minimized at a level where scratching or pushing of the active material layer does not occur. In addition, the angle and length of the slope of the active material layer vary depending on the viscosity of the electrode slurry used to form the active material layer, and the thickness and length of the insulating layer can vary depending on the viscosity and application amount of the insulating liquid, and it is also preferable that the position and angle of the insulating layer forming die (40) can be adjusted according to these circumstances. If the angle of the nozzle part (41) is adjusted by only installing the first angle adjustment part (42) and the second angle adjustment part (43) without introducing the azimuth adjustment part (44), it is difficult to finely adjust the gap between the position where the insulating layer of the electrode is formed and the position where the insulating liquid of the die (40) for forming the insulating layer is sprayed, and it is difficult to adjust the thickness of the insulating layer by considering the spreadability according to the viscosity of the insulating liquid, the speed of the insulating liquid being discharged, the discharge amount, etc. Meanwhile, the azimuth adjustment part (44) must be formed to draw an arc centered on the rotation axis of the coater roller (10), and if only the height of the nozzle part (41) (for example, a direction simultaneously perpendicular to the MD and TD of the electrode sheet material (20)) is adjusted instead of the azimuth adjustment part (44), it is difficult to form an orthogonal shape between the die (40) for forming the insulating layer and the coater roller (10) at the desired position, and it is difficult to control the thickness of the insulating layer by considering the spreadability according to the viscosity of the insulating liquid, the speed of the insulating liquid being discharged, the discharge amount, etc. The angle of the arc drawn by the above azimuth adjustment unit (44) is not particularly limited, and may be, for example, greater than 0° and less than or equal to 360°, specifically greater than 0° and less than or equal to 270°, more specifically greater than 0° and less than or equal to 180°, and most specifically 90°. The radius (R2) of the arc drawn by the above azimuth adjustment unit (44) may be at least 1 time, specifically 1 to 3 times, the radius (R1) of the coating roller, but is not particularly limited. Through the first angle adjustment unit (42), the second angle adjustment unit (43), and the azimuth adjustment unit (44), the position and angle of the nozzle unit (41) can be precisely adjusted. Specifically, the electrode sheet material (20) may include a current collector (21) and an active material layer (22) disposed on at least a portion of the surface of the current collector (21), and the nozzle unit (21) may be adjusted in position and angle so as to spray an insulating liquid onto the active material layer (22). In addition, the active material layer (22) may include an inclined portion (221) that is inclined toward the current collector (21) at least at one end and a flat portion (222) that is partitioned excluding the inclined portion (221), and the nozzle unit (21) may be adjusted in position and angle so as to spray an insulating liquid such that an insulating layer (50) is formed on at least a portion of the inclined portion (221). In addition, the current collector (21) may include a non-conductive portion adjacent to the inclined portion (221) on which an active material layer (22) is not formed, and the nozzle portion (41) may be configured to adjust the spraying position and angle of the insulating liquid so that an insulating layer (50) is continuously formed over at least a portion of the inclined portion (221) and at least a portion of the non-conductive portion. For example, the angle formed between the spraying direction of the insulating liquid of the nozzle portion (41) and the current collector or electrode sheet may be 5° to 45°, preferably 15° to 35°, and when within the above range, problems such as the active material layer being scratched by the die (40) for forming the insulating layer may be prevented, while the current collector may be pressed by the discharge of the insulating liquid to prevent the insulating layer from being thickly coated. In addition, the electrode manufacturing device may further include a position adjusting unit for adjusting the position of the die (40) for forming the insulating layer. The position adjusting unit may be provided to adjust the position of the die (40) for forming the insulating layer itself, rather than the angle of the nozzle unit (41). For example, the position adjusting unit may include at least one of a first linear guide (46) formed along the moving direction (MD) of the electrode sheet material (20); a second linear guide (45) formed along the vertical direction (TD) of the moving direction of the electrode sheet material (20); and a third linear guide (47) for adjusting the position of the die for forming the insulating layer in the height direction (H). Accordingly, the position of the die for forming the insulating layer (40) may be adjusted along the first linear guide (45), the second linear guide (46), and / or the third linear guide (47). At this time, the height direction (H) of the die (40) for forming the insulating layer may mean a direction orthogonal to both the MD direction and the TD direction. The above electrode manufacturing device may further include a drying unit (not shown) positioned behind the spraying position of the nozzle unit (41) based on the movement direction of the electrode sheet material (20). The drying unit may dry the insulating liquid dispersed from the nozzle unit (41) to facilitate the formation of an insulating layer. The drying means of the above drying unit is not particularly limited, and for example, a hot air method, a direct heating method, an induction heating method, etc. may be employed, and specifically, drying through the above drying unit can be performed at 50°C to 180°C. The above electrode manufacturing device may further include a recovery roller (not shown) for winding the electrode sheet material (20) on which the insulating layer is formed. Specifically, the recovery roller may be positioned behind the spraying position of the nozzle unit (41) based on the moving direction of the electrode sheet material (20). More specifically, when the electrode manufacturing device further includes a drying unit, the recovery roller may be positioned behind the position of the drying unit based on the moving direction of the electrode sheet material (20). There may be multiple dies for forming the above insulating layer. The above dies for forming a plurality of insulating layers can be sequentially arranged in the moving direction (MD) of the electrode sheet material. Each nozzle section included in the above-described plurality of insulating layer forming dies can have its position and angle adjusted to form two or more insulating layers. For example, the dies for forming the plurality of insulating layers can be sequentially arranged adjacent to each other in the moving direction (MD) of the electrode sheet material, and then two or more insulating layers can be formed by adjusting each angle adjustment unit and azimuth adjustment unit. In addition, the plurality of dies for forming the insulating layers may be sequentially arranged in a direction perpendicular to the direction of movement of the electrode sheet material (TD). In this case, the plurality of dies for forming the insulating layers may simultaneously form insulating layers on two inclined portions (221) formed at both ends of the active material layer. In addition, some of the dies for forming the plurality of insulating layers may be placed on one surface of the electrode sheet material, and the rest may be placed on the other surface of the electrode sheet material, thereby forming insulating layers on both surfaces of the electrode sheet material. The embodiments of the present invention described above may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to a person having average knowledge in the art. [Explanation of symbols] 10: coater roller, 20: electrode sheet material, 21: current collector, 211: non-coated portion, 22: active material layer, 221: inclined portion, 222: flat portion, 30: moving space portion, 31: support roller, 40: die for forming an insulating layer, 41: nozzle portion, 42: first angle adjusting portion, 43: second angle adjusting portion, 44: azimuth adjusting portion, 45, 46: position adjusting portion, 45: second linear guide, 46: first linear guide, 47: third linear guide, 50: insulating layer

Claims

1. A coater roller arranged to support the electrode sheet material; A moving space section in which the electrode sheet material is moved by the rotation of the coater roller; and Including a die for forming an insulating layer installed on the moving path of the electrode sheet material; The above-mentioned insulating layer forming die comprises a nozzle portion for spraying an insulating liquid onto the electrode sheet material, a first angle adjusting portion for adjusting an angle of the nozzle portion in a direction in which the electrode sheet material moves, a second angle adjusting portion for adjusting an angle of the nozzle portion in a direction perpendicular to the direction in which the electrode sheet material moves, and an azimuth adjusting portion formed to draw an arc centered on the rotational axis of the coater roller and capable of moving the position of the nozzle portion along the arc.

2. In claim 1, An electrode manufacturing device in which the die for forming the insulating layer is installed spaced apart from the electrode sheet material.

3. In claim 1, An electrode manufacturing device further comprising a position adjusting unit for adjusting the position of a die for forming the insulating layer.

4. In claim 3, An electrode manufacturing device, wherein the position adjusting unit includes at least one of a first linear guide formed along a moving direction of the electrode sheet material; a second linear guide formed along a direction perpendicular to the moving direction of the electrode sheet material; and a third linear guide for adjusting a position of the die for forming the insulating layer in the height direction.

5. In claim 1, The above electrode sheet material includes a current collector and an active material layer disposed on at least a portion of the current collector surface, An electrode manufacturing device in which the nozzle part is positioned and angled to spray an insulating liquid onto the active material layer.

6. In claim 5, The above active material layer includes at least one inclined portion inclined toward the collector and a flat portion defined excluding the inclined portion, The above nozzle part is an electrode manufacturing device in which the spraying position and angle of the insulating liquid are adjusted so that an insulating layer is formed on at least a part of the inclined part.

7. In claim 6, The above-mentioned collector is adjacent to the above-mentioned inclined portion and includes a non-conductive portion on which an active material layer is not formed, An electrode manufacturing device in which the nozzle section has an electrode manufacturing apparatus in which the spraying position and angle of the insulating liquid are adjusted so that an insulating layer is continuously formed over at least a portion of the inclined section and at least a portion of the uneven section.

8. In claim 1, There are multiple dies for forming the above insulating layer, An electrode manufacturing device in which the above plurality of insulating layer forming dies are sequentially arranged in the direction of movement of the electrode sheet material.

9. In claim 8, An electrode manufacturing device in which each nozzle section included in the above-mentioned plurality of insulating layer forming dies is positioned and angled to form two or more insulating layers.

10. In claim 1, An electrode manufacturing device further comprising a drying unit positioned behind the spraying position of the nozzle unit based on the movement direction of the electrode sheet material.

Images