Foreign object removal device

Abstract

According to one embodiment of the present invention, a foreign matter removal device removes foreign matter from an electrode surface that is continuously transported in one direction, and includes an ejection unit that ejects air toward the electrode surface, an suction unit that sucks in foreign matter separated from the electrode surface, and an extension unit that extends between the ejection unit and the suction unit, and the extension unit has an adjustment unit that is indented in a direction away from the electrode surface.

Description

[Technical Field]

[0001] Cross-reference to related applications This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0117897 dated September 3, 2021, and Korean Patent Application No. 10-2022-0111454 dated September 2, 2022, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a foreign matter removal device, and more particularly to a foreign matter removal device that removes foreign matter from electrode surfaces during a battery manufacturing process. [Background technology]

[0003] As technological development and demand for mobile devices increases, the demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are attracting much attention as an energy source for mobile devices such as mobile phones, digital cameras, laptops, and wearable devices, as well as for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.

[0004] Depending on the shape of the battery case, secondary batteries are classified into cylindrical batteries and prismatic batteries, in which an electrode assembly having a laminated structure of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is housed in a cylindrical or prismatic metal case, and pouch batteries, in which the electrode assembly is housed in a pouch-shaped case made of an aluminum laminate sheet.

[0005] Secondary batteries can also be classified by the structure of the electrode assembly, which is a stacked structure consisting of a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Representative examples include a jelly-roll (wound) electrode assembly, in which long sheet-type positive and negative electrodes are wound up with a separator interposed between them, and a stack (folded) electrode assembly, in which multiple positive and negative electrodes cut to a predetermined size are stacked in sequence with a separator interposed between them. Recently, to address the issues associated with the jelly-roll and stacked electrode assemblies, a stack / folded electrode assembly, which is a hybrid of the jelly-roll and stacked types, has been developed.

[0006] Such electrode assemblies can generally be assembled or manufactured using a semi-automated or automated manufacturing line. For example, the electrodes or separators constituting the electrode assembly are transported along guide members such as rails or rotating rolls to a device that performs processes such as cutting, bonding, laminating, and winding, and can be assembled or manufactured into the form of an electrode assembly through the operation of the device.

[0007] However, during the entire manufacturing process, foreign matter such as metal powder from the electrode powder or current collector is generated, and such foreign matter falls onto the surface of the electrode during the process of transporting the electrode through rails or rotating rolls between processes, or during processing such as cutting, bonding, stacking, and winding, resulting in a problem of degrading the voltage characteristics of the completed battery.

[0008] FIG. 1 is a cross-sectional view showing a conventional foreign matter removal device. Referring to FIG. 1, the foreign matter removal device 10 includes an ejection unit 12 that ejects air toward the surface of an electrode E moving along a transfer direction p1, and a suction unit 14 that sucks in foreign matter separated from the electrode surface, thereby removing foreign matter from the surface of the electrode E.

[0009] However, in the conventional foreign matter removal device 10, the air injected from the injection part 12 tends to concentrate on the underside of the extension part 16 between the injection part 12 and the suction part 14 rather than on the electrode E due to the Coanda effect, which reduces the efficiency of foreign matter removal. Furthermore, if the flow velocity / flow rate is increased to solve this problem, the air consumption increases and loud noise is generated. Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the present invention is to provide a foreign matter removal device that can improve the foreign matter removal efficiency and minimize the product defect rate by concentrating the injected air on the electrode surface.

[0011] The problems that the present invention aims to solve are not limited to those described above, and problems not mentioned above will also be clearly understood by those skilled in the art to which the present invention pertains from this specification and the accompanying drawings. [Means for solving the problem]

[0012] According to one embodiment of the present invention, a foreign matter removal device for removing foreign matter from an electrode surface being continuously transported in one direction includes an injection unit that injects air toward the electrode surface, an intake unit that sucks in foreign matter separated from the electrode surface, and an extension unit extending between the injection unit and the intake unit, the extension unit having an adjustment unit that is indented in a direction away from the electrode surface.

[0013] The injection portion and the suction portion are formed with slits that form an angle with the electrode transfer direction, and the air injected from the injection portion moves in the opposite direction to the electrode transfer direction, and the air sucked by the suction portion moves in the same direction as the moving direction of the injected air.

[0014] The acute angle formed by the ejector with respect to the electrode transfer direction may have the same value as the acute angle formed by the suction part with respect to the electrode transfer direction. The angle at which the ejector ejects air with respect to the electrode transfer direction may be 35 degrees to 55 degrees.

[0015] The injection portion may be formed as a slit that forms an angle with the direction of movement of the electrode, and the width of the slit may be 0.03 mm to 0.07 mm.

[0016] The injection portion may be formed as a slit that forms an angle with the direction of movement of the electrode, and a protrusion that protrudes toward an air flow space may be located at an end of the injection portion, and the air flow space may refer to a space formed above the surface of the electrode.

[0017] The protrusion forms an angle with the direction of movement of the electrode, and the angle formed by the protrusion with the direction of movement of the electrode may correspond to the angle formed by the injection portion with the direction of movement of the electrode.

[0018] The protruding portion may have a protruding length of 2 mm to 3 mm. The angle at which the suction portion sucks in foreign matter may be 35 degrees to 55 degrees.

[0019] The suction portion may be formed with a slit that forms an angle with the direction of movement of the electrode, and the width of the slit may be 1.0 mm to 3.0 mm.

[0020] The extension may have a length of 20 mm to 35 mm. The depth of the adjusting portion is 3 mm to 5 mm, and the depth of the adjusting portion can be calculated based on one surface of the extension portion where the adjusting portion is not formed. [Effects of the Invention]

[0021] According to an embodiment, the foreign matter removal device of the present invention can improve the foreign matter removal rate by concentrating the injected air on the electrode surface, thereby reducing the product defect rate due to foreign matter on the electrode surface and improving the uniformity and reliability of the product.

[0022] The effects of the present invention are not limited to the effects described above, and effects not mentioned above will also be clearly understood by those having ordinary skill in the art to which the present invention pertains from this specification and the accompanying drawings. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 10 is a cross-sectional view showing a conventional foreign matter removal device. [Figure 2] 1 is a cross-sectional view of a foreign matter removal device according to an embodiment of the present invention. [Figure 3] 3 shows the results of an experiment to optimize the protrusion of the foreign matter removal device shown in FIG. 2. [Figure 4] Optimization experiment design and results of the foreign matter removal device according to Figure 2. [Figure 5] Optimization experiment design and results of the foreign matter removal device according to Figure 2. [Figure 6] 6 is a graph analyzing the experimental results of FIGS. 4 and 5. [Figure 7] 6 is a graph analyzing the experimental results of FIGS. 4 and 5. [Figure 8] 6 is a graph analyzing the experimental results of FIGS. 4 and 5. [Figure 9] 6 is a graph analyzing the experimental results of FIGS. 4 and 5. [Figure 10] 10 is a diagram showing a comparison of experimental results between a conventional foreign matter removal device and a foreign matter removal device according to an embodiment of the present invention. [Figure 11] 10 is a diagram showing a comparison of the foreign matter removal rates between a conventional foreign matter removal device and the foreign matter removal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024]

[0033] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms other than those described below, and the scope of the present invention is not limited to the embodiments described herein.

[0025] In order to clearly explain the present invention, parts that are not necessary for the explanation will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0026] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily enlarged or reduced for the convenience of explanation, and it is obvious that the content of the present invention is not limited to the illustrated ones. In the following drawings, the thickness of each layer is enlarged to clearly show various layers and regions. In the following drawings, the thickness of some layers and regions is exaggerated for the convenience of explanation.

[0027] Furthermore, when a layer, film, region, plate, or other portion is described as being "on" or "above" another portion, this should be interpreted as including not only the case where the layer, film, region, plate, or other portion is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "directly on" the other portion, it can mean that there is no other portion therebetween. Furthermore, being "on" or "above" a reference portion means being located above or below the reference portion, and does not necessarily mean being located "on" or "above" the opposite direction of gravity. Meanwhile, descriptions of being "on" or "above" another portion, as well as descriptions of being "below" or "below" another portion, should be understood with reference to the above content.

[0028] Also, throughout the specification, when a part is said to "comprise" a certain element, this means that it may further include other elements, not excluding other elements, unless specifically stated to the contrary.

[0029] Furthermore, throughout the specification, the term "on a plane" means the part in question when viewed from above, and the term "on a cross section" means the part in question when viewed from the side, cut vertically.

[0030] A foreign matter removal device according to an embodiment of the present invention will be described below. The foreign material removal device 100 described below will be described as being used to remove foreign materials from the surface of an electrode E in a secondary battery manufacturing process. However, this is not necessarily the case, and it is obvious that the device can be used in various processes that require the removal of foreign materials from a surface, other than the secondary battery manufacturing process.

[0031] FIG. 2 is a cross-sectional view of a foreign matter removal device according to an embodiment of the present invention. Referring to FIG. 2, the foreign body removal device 100 according to an embodiment of the present invention may have two main bodies 110 symmetrically arranged with respect to an electrode E that crosses the center of the foreign body removal device 100 .

[0032] On the other hand, in describing this embodiment, the following description will focus on the main body portion 110 located above the electrode E, but it should be made clear in advance that such description can also be applied to the main body portion 110 located below the electrode E.

[0033] The foreign matter removal device 100 includes an injection unit 120 that injects air toward the surface of the electrode E moving between two main bodies 110 along a transfer direction p1, an intake unit 140 that sucks in foreign matter separated from the electrode surface, and an extension unit 160 that extends between the injection unit 120 and the intake unit 140, and the extension unit 160 may be formed with an adjustment unit 180 having a concave shape.

[0034] The electrode E may be the target of the foreign material removal device 100. The electrode E may be provided in the form of a long rectangular sheet in which an electrode slurry is applied to a current collector. The current collector may be made of stainless steel, aluminum, copper, nickel, titanium, calcined carbon, or the like, and may be provided in various forms such as a film, sheet, foil, net, porous material, foam, or nonwoven fabric. The electrode slurry may typically include, but is not limited to, an electrode active material, a conductive material, a binder, and a solvent.

[0035] The electrode E can move in one direction by the rotational force of the rollers that wind or unwind the electrode. The electrode E can move continuously by the rotational force of the rollers that wind or unwind the electrode. The rollers allow the electrode E to move between the two main body parts 110 inside the foreign body removal device 100.

[0036] The spray unit 120 may be configured to spray air to remove foreign matter adhering to the surface of the electrode E. The spray unit 120 may be disposed in the foreign matter removal device 100 far from the location where the electrode E enters to pass through the foreign matter removal device 100 so as to face the electrode E after the suction unit 140 based on the transfer direction p1 of the electrode E.

[0037] The injection part 120 may be formed in the body part 110 in the form of a slit. The flow rate and flow velocity of air injected from the injection part 120 can be determined depending on the width of the slit in the injection part 120. The width of the slit in the injection part 120 according to this embodiment may be smaller than the width of the slit in a conventional injection part 120. The width of the slit in the injection part 120 may be less than 0.5 mm. The width of the slit in the injection part 120 may be 0.1 mm or less, 0.07 mm or less, or 0.01 mm or more, 0.03 mm or more, and more specifically, 0.05 mm with an error range of 0.005 mm or less. This may be because the flow velocity can be maximized for the same flow rate by making the slit width smaller than conventional slits.

[0038] The spray angle a1 of the air sprayed by the spray unit 120 may form an angle with the moving direction p1 of the electrode E. The spray angle a1 may be determined depending on the shape of the slits of the spray unit 120. Here, the spray angle a1 may refer to an acute angle among the angles formed between the moving direction p1 of the electrode E and the spray path of the air.

[0039] Specifically, the spray portion 120 may be formed in an oblique line toward the surface of the electrode E inside the body portion 110. The spray portion 120 may be formed in an oblique line so that the air discharged from the spray portion 120 moves in a direction opposite to the electrode transfer direction p1. Since the pressure that the air discharged from the spray portion 120 applies to the surface of the electrode E may vary depending on the spray angle a1 of the spray portion 120, the spray angle a1 of the spray portion 120 must be appropriately designed. A detailed explanation of the spray angle a1 will be provided below using experimental data.

[0040] A protrusion 122 may be formed at the end of the spray portion 120. The protrusion 122 may refer to a portion that extends from the spray portion 120 and protrudes into the air flow space. Here, the 'flow space' refers to the space formed above the surface of the electrode E, and may refer to the space formed between the foreign matter removal device 100 and the surface of the electrode E. Here, the 'flow space' may be made larger by the adjustment portion 180, and in this case, the 'flow space' may refer to the space between the indented surface of the adjustment portion 180 and the surface of the electrode E.

[0041] The protrusion 122 is located at the upper end of the air flow direction discharged from the injection part 120, thereby adjusting the flow direction of the injected air. The flow direction of the air can be changed by the angle of the protrusion 122. Here, the angle of the protrusion 122 corresponds to the injection angle a1 of the injection part 120. However, the angle can be designed to be smaller or larger than the injection angle a1 according to the designer's intention. The flow direction of the air can also be changed by the size of the protrusion 122. The effect of the protrusion 122 on the air can be changed depending on the extent to which the protrusion 122 protrudes into the air flow space.

[0042] The suction unit 140 may be configured to remove foreign matter separated from the surface of the electrode E by the spray unit 120 by sucking them in. The suction unit 140 may be disposed near the location where the electrode E enters the foreign matter removal device 100 so as to face the electrode E before the spray unit 120 in the transfer direction p1 of the foreign matter removal device 100.

[0043] The intake part 140 may be formed in the form of a slit in the main body part 110. The flow rate and flow velocity of air drawn into the intake part 140 are determined by the width of the slit in the intake part 140. In terms of function, it may be preferable for the intake part 140 to have a slit width larger than that of the injection part 120. The width of the slit in the intake part 140 may be 1.0 to 3.0 mm, and more specifically, may be 2.0 mm with an error range of 0.2 mm or less.

[0044] The angle at which the suction unit 140 draws in air may form an angle with the transfer direction p1 of the electrode E. Specifically, the suction unit 140 may be formed in an oblique line from the surface of the electrode E toward the inside of the body 110. The suction unit 140 may be formed in an oblique line so that the drawn air flows from the front to the rear with respect to the transfer direction p1 of the electrode. The suction angle of the suction unit 140 must be appropriately designed. For example, the suction angle of the suction unit 140 may be 35 to 55 degrees, which may mean an acute angle with the transfer direction p1 of the electrode E.

[0045] Meanwhile, the ends of the ejection part 120 and the suction part 140 may be arranged toward each other. This may be because the suction part 140 effectively collects the air ejected from the ejection part 120. Here, the ends may refer to the parts of the ejection part 120 and the suction part 140 that are located closest to the electrode E.

[0046] The extension portion 160 may refer to the portion extending from the injection portion 120 to the suction portion 140. The air injected from the injection portion 120 can flow in the space between the extension portion 160 and the electrode E, and then be sucked in by the suction portion 140.

[0047] The length w1 of the extension portion 160 determines the air flow space and can therefore affect the foreign matter removal efficiency. The length w1 of the extension portion 160 can be set differently depending on the flow rate and flow velocity of the air discharged from the injection portion 120 and the suction force of the suction portion 140. Here, the length w1 of the extension portion 160 refers to the length between the end of the injection portion 120 and the suction portion 140. If a protrusion 122 is formed at the end of the injection portion 120, the length w1 of the extension portion 160 can refer to the length from the end of the protrusion 122 to the suction portion 140. The length w1 of the extension portion 160 can be calculated based on a straight line parallel to the transfer direction p1. A detailed explanation of the length w1 of the extension portion 160, which improves the foreign matter removal effect, will be provided below using experimental data.

[0048] The control portion 180 may be a portion for controlling the flow of air injected from the injection portion 120. The control portion 180 may be formed on the extension portion 160. The control portion 180 may also be referred to as an 'airflow control portion'. The control portion 180 may be configured to concentrate the air injected from the injection portion 120 on the surface of the electrode E. The control portion 180 may be configured to minimize the Coanda effect.

[0049] The adjustment portion 180 may have a concave shape in a direction away from the surface of the electrode E. The adjustment portion 180 may have a concave shape in a direction away from the surface of the electrode E. The adjustment portion 180 may be a portion of the extension portion 160 that has been removed to expand the air flow space. Through the adjustment portion 180, a wide space can be formed between the injection portion 120 and the suction portion 140 through which the air injected onto the surface of the electrode E flows. The formation of the adjustment portion 180 allows the air flow space to be expanded.

[0050] The degree to which the adjusting portion 180 is recessed can be expressed as the maximum depth or height of the adjusting portion 180 calculated based on one surface of the extension portion 160 before the adjusting portion 180 is formed. The depth d1 of the adjusting portion 180 can be set differently depending on the length w1 of the extension portion 160, the flow rate and flow velocity of the air discharged from the injection portion 120, and the suction force of the suction portion 140. The depth d1 of the adjusting portion 180, which improves the foreign matter removal effect, will be described in detail below using experimental data.

[0051] The following describes an experimental design and results for optimizing the foreign material removal device 100 according to one embodiment of the present invention.

[0052] FIG. 3 shows the results of an experiment to optimize the protrusion of the foreign body removal device shown in FIG. Referring to FIG. 3, the injection part 120 is provided in the form of a slit formed in the body part 110, and the effect of the protrusion 122 of the injection part 120 can be changed depending on the shape of the corner 162 of the extension part 160.

[0053] 3(a), Case 1 may be a case where the adjustment unit 180 is not formed in the foreign matter removal device 100. Referring to FIG. 3(a), the air discharged from the injection unit 120 has the fastest flow velocity around the extension unit 160 and a slower flow velocity around the electrode E. As such, if the adjustment unit 180 is not formed in the foreign matter removal device 100, it may be difficult to achieve a high flow velocity / volume of the gas passing around the electrode E, which may result in a decrease in foreign matter removal efficiency.

[0054] Case 2 of Figure 3(b) may be a case where the foreign material removal device 100 is formed with the adjusting portion 180 and the corner 162 has a symmetrical shape with the protrusion 122. In other words, the protrusion 122 does not protrude into the air flow space. This may also be referred to as a case where the protrusion 122 is not formed. Referring to Figure 3(b), it was confirmed that the flow velocity of the air discharged from the ejection portion 120 around the extension portion 160 is slightly lower than in the case of Figure 3(a), but the flow velocity around the electrode E cannot be improved.

[0055] 3(c), Case 3 may be a case where the foreign matter removal device 100 is provided with the adjusting portion 180 and a portion of the end of the corner 162 is removed, causing a portion of the protrusion 122 to protrude into the air flow space. Referring to FIG. 3(c), the air discharged from the ejecting portion 120 tends to flow out to the left, and no effect of improving the flow rate around the electrode E is observed.

[0056] Case 4 in Figure 3(d) may be a case where the foreign material removal device 100 is formed with the adjusting part 180, and the protrusion 122 protrudes into the air flow space by removing the end of the corner 162 due to the indented shape of the adjusting part 180. Referring to Figure 3(d), it can be seen that the air discharged from the spraying part 120 is concentrated downward, thereby increasing the flow velocity around the electrode E compared to the flow velocity around the extension part 160 or the adjusting part 180. In other words, it can be seen that the effect of concentrating the air discharged from the spraying part 120 around the electrode E is achieved by forming the protrusion 122 large enough.

[0057] 3, it is preferable that the outermost corner 162 of the extension 160 is removed due to the shape of the adjustment portion 180. By removing the corner 162 of the extension 160, the protrusion 122 can be positioned in a protruding state toward the flow space, thereby allowing the protrusion 122 to be involved in the direction of air flow. In addition, it is preferable that the size of the protrusion 122 is formed sufficiently large.

[0058] Figures 4 and 5 show the optimization experiment design and results for the foreign matter removal device shown in Figure 2. In Figures 4 and 5, WSS stands for "wall shear stress," which refers to the stress generated on the surface, and left outflow refers to the phenomenon in which air flows in the opposite direction instead of the designed direction.

[0059] 4 and 5, a DOE experiment design with three factors and three levels was performed to derive the optimal conditions for the foreign material removal device 100, and the results of experiments conducted using CFD for nine conditions can be seen. The basic conditions, experimental factors, and levels of the experiment are shown in the table below. When the experiment was performed, the electrode moving speed was 110 m / min, and the protrusion 122 was formed in the shape shown in FIG. 3(d). It should be noted that in the table and explanation below, "blowing" refers to the injection unit 120, and "suction" refers to the suction unit 140.

[0060] [Table 1]

[0061] [Table 2]

[0062] 6 to 9 are graphs analyzing the experimental results of FIGS. 6 to 9 and the following table, the DOE analysis results obtained by analyzing the experimental results to derive the optimum conditions for the foreign material removal device 100 can be seen.

[0063] Tables 3 to 6 are tables where Taguchi analysis was performed on four variables: electrode surface velocity, WSS, left outflow, and suction velocity. Table 7 is a table where the main factors were selected based on the occupancy values ​​listed in Tables 3 to 6 as a result of analysis using the tables and figures mentioned above. 6 to 9 show main effect diagrams for each variable.

[0064] [Table 3]

[0065] [Table 4]

[0066] [Table 5]

[0067] [Table 6]

[0068] [Table 7]

[0069] Referring to Tables 3 to 7, it was confirmed that the injection angle a1 of the injection part 120 has a significant effect on the electrode surface flow velocity and WSS, and the length w1 of the extension part 160 has a significant effect on all of WSS, left outflow, and suction flow velocity. It was also confirmed that the depth d1 of the adjustment part 180 does not significantly affect left air outflow.

[0070] Referring to FIGS. 6 and 8, when the spray angle a1 of the sprayer 120 and the depth d1 of the control portion 180 deviate from a certain level, the electrode surface flow velocity value tends to decrease due to the occurrence of outflow. Referring to FIG. 8, which shows whether or not there is outflow on the left side, it is preferable to prioritize and exclude data values ​​where outflow occurred from the optimal conditions. Also, referring to FIG. 7, it was confirmed that when the depth d1 of the control portion 180 is around 5 mm, the WSS value fluctuates significantly. This is presumably because the separation distance h1 between the main body 110 and the electrode E is designed to be 5 mm. Also, as shown in FIG. 9, it was confirmed that the spray angle a1 of the sprayer 120 is 45 degrees with an error range of 0.5 degrees, the depth d1 of the control portion 180 is 3 to 5 mm, more specifically, 5 mm with an error range of 0.2 mm, and the length w1 of the extension portion 160 is 20 to 35 mm, more specifically, 20 mm with an error range of 0.2 mm, which is advantageous in terms of suction consumption.

[0071] Table 8 below shows the optimum conditions derived from the above results. Specifically, the values ​​of the injection angle a1 of the injection portion 120, the length w1 of the extension portion 160, and the depth d1 of the adjustment portion 180 for each characteristic were based on the values ​​shown in Figures 6 to 9. In addition, the optimum condition values ​​were selected based on the results of the main factors in Table 7.

[0072] [Table 8]

[0073] FIG. 10 shows a comparison of the experimental results of a conventional foreign matter removal device and a foreign matter removal device according to an embodiment of the present invention.

[0074] For a clearer comparison, Fig. 10 compares the CFD simulation results of the foreign matter removal device 100 of the present embodiment with the results of a conventional foreign matter removal device 10 without the adjustment unit 180. Here, the foreign matter removal device 100 of the present embodiment reflects the optimal conditions of Table 8 derived through the above-mentioned experiment.

[0075] 10(a) and 10(b), the slit widths of the ejector 12 and the ejector 120 were different, but the flow rate of the air ejected from them was the same (the flow velocity of the ejected air was different), the slit angle of the suction part 160 was 45 degrees, and the flow velocity of the suction was the minimum flow velocity at which no air leakage occurred. Furthermore, when the experiment was conducted, the electrode movement speed was 110 m / min, and the separation distance h1 between the main body part 110 and the electrode E was 5 mm. See Table 9 below for other conditions of the experiment.

[0076] [Table 9]

[0077] 10(b), the foreign matter removal device 100 of this embodiment, to which the optimum conditions are applied, shows an 800% improvement in flow velocity around the surface of the electrode E compared to the conventional foreign matter removal device 100 of FIG. 10(a). This result confirms that the foreign matter removal device 100 of this embodiment can more efficiently remove foreign matter attached to the surface of the electrode E than the conventional device.

[0078] FIG. 11 shows a comparison of the foreign matter removal rates of a conventional foreign matter removal device and a foreign matter removal device according to an embodiment of the present invention.

[0079] For a clearer comparison, Fig. 11 shows the results of the foreign matter removal device 100 of the present embodiment and the conventional foreign matter removal device 10. The foreign matter removal device 100 of the present embodiment reflected the optimal conditions of Table 8 derived through the above-mentioned experiment.

[0080] In this experiment, the suction flow rate was the minimum flow rate at which no air leakage occurred, and the flow rate of the ejection part 120 was 77 LPM. In addition, the separation distance h1 between the main body part 110 and the electrode E was 5 mm. See Table 10 below for the evaluation conditions and procedures of this experiment.

[0081] [Table 10]

[0082] 11, it can be seen that the foreign matter removal device 100 of this embodiment, to which the optimum conditions were applied, exhibited a foreign matter removal rate that was improved by approximately 5000% compared to the conventional foreign matter removal device 100. This may be because, as shown in the results of FIG. 10, the foreign matter removal device 100 is provided with the adjustment unit 180, and the numerical values ​​of each component are appropriately adjusted, allowing the air sprayed from the spray unit 120 to sufficiently collide with the surface of the electrode E and separate the foreign matters.

[0083] The above description is merely illustrative of the technical concept of the present invention, and various modifications and variations may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present specification described above may be realized separately or in combination with each other.

[0084] The embodiments disclosed in this specification are not intended to limit the concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. Therefore, the scope of protection of the present invention should be interpreted according to the following claims, and all technical concepts within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0085] 100: Foreign matter removal device 110: Main body 120: Injection part 122:Protrusion 140: Suction part 160: Extension part 180: Adjustment section

Claims

1. A foreign matter removal device for removing foreign matter from the surface of an electrode that is continuously transported in one direction, an ejection unit that ejects air toward the electrode surface; a suction unit that sucks in foreign matter separated from the electrode surface; and an extension extending between the injection portion and the intake portion; The extension portion has an adjusting portion that is indented in a direction away from the electrode surface, The end of the injection part is provided with a protrusion protruding toward the air flow space by removing the end of the corner of the upper part of the slit, The injection portion is formed as a slit that forms an angle with the direction of movement of the electrode, the protrusion has a protrusion length that allows the air jetted from the jetting portion to be concentrated on the electrode surface, the protruding length is a length of the portion of the slit where the corner is removed along the direction of the injection portion, The protruding length of the foreign matter removal device is 2 mm to 3 mm.

2. The suction portion is formed with a slit that forms an angle with the direction of movement of the electrode, The air jetted from the jetting portion moves in a direction opposite to the direction of movement of the electrode, 2. The foreign matter removal device according to claim 1, wherein the air sucked by the suction unit moves in the same direction as the direction of movement of the injected air.

3. 3. The foreign matter removal device according to claim 2, wherein the acute angle formed by the ejection part and the direction of movement of the electrode is the same as the acute angle formed by the suction part and the direction of movement of the electrode.

4. 2. The foreign matter removal device according to claim 1, wherein the angle at which the air is sprayed from the spraying portion is 35 degrees to 55 degrees with respect to the direction in which the electrode is moved.

5. 2. The foreign matter removal device according to claim 1, wherein the width of the slit is 0.03 mm to 0.07 mm.

6. The foreign matter removal device according to claim 1 , wherein the flow space refers to a space formed above the surface of the electrode.

7. the protrusion forms an angle with the direction of movement of the electrode; 7. The foreign matter removal device according to claim 6, wherein an angle formed between the protrusion and the direction of movement of the electrode corresponds to an angle formed between the injection portion and the direction of movement of the electrode.

8. 2. The foreign matter removal device according to claim 1, wherein the angle at which the suction section suctions the foreign matter is 35 degrees to 55 degrees.

9. The suction portion is formed with a slit that forms an angle with the direction of movement of the electrode, 2. The foreign matter removal device according to claim 1, wherein the width of the slit is 1.0 mm to 3.0 mm.

10. 2. The foreign matter removal device according to claim 1, wherein the extension has a length of 20 mm to 35 mm.

11. 2. The foreign material removal device of claim 1, wherein the depth of the adjusting portion is 3 mm to 5 mm, and the depth of the adjusting portion is calculated based on one surface of the extension portion where the adjusting portion is not formed.

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