Device for cleaning electrode rolling rolls

Abstract

According to one embodiment of the present disclosure, there is provided an apparatus for cleaning an electrode roll, comprising: a cleaning member configured to allow a surface of the electrode roll to come into contact with a cleaning cloth, a nozzle configured to spray a cleaning liquid onto the cleaning cloth, a control unit configured to adjust an amount of spraying of the cleaning liquid, and a monitoring unit configured to monitor the amount of spraying of the cleaning liquid, wherein the cleaning liquid is distilled water, and wherein the control unit adjusts the amount of the cleaning liquid sprayed by the nozzle at one time to be in a range of 0.05 ml to 0.2 ml.

Description

Technical Field

[0001] This disclosure relates to an apparatus for cleaning electrode rolling rolls, and more particularly, to a cleaning apparatus having an improved system for supplying cleaning fluid during the cleaning of the rolling rolls. Background Technology

[0002] In modern society, with the daily use of portable devices such as mobile phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), technological development in related fields is very active. Furthermore, in an attempt to address air pollution caused by existing gasoline vehicles using fossil fuels, rechargeable / dischargeable secondary batteries are being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs). Therefore, the demand for the development of secondary batteries is increasing.

[0003] Currently, commercially available rechargeable batteries include nickel-cadmium (NiCd), nickel-metal hydride (NiMH), nickel-zinc (NiZn), and lithium-ion batteries. Among these, lithium-ion batteries have attracted considerable attention due to their advantages such as free charge / discharge, very low self-discharge rate, and high energy density.

[0004] Lithium-ion batteries primarily use lithium-based oxides and carbon materials as positive and negative electrode active materials, respectively. A lithium-ion battery consists of an electrode assembly and an external material (i.e., the battery casing). The electrode assembly contains positive and negative electrode plates coated with positive and negative electrode active materials, respectively. A separator is inserted between the positive and negative electrode plates. The external material hermetically encloses the electrode assembly and the electrolyte together.

[0005] These rechargeable batteries are widely used not only in small devices such as portable electronic devices, but also in medium and large devices such as vehicles and energy storage systems (ESS), and their application is rapidly expanding. Furthermore, there has recently been a growing trend of using residential battery packs for electricity storage purposes.

[0006] The manufacturing process of this type of lithium secondary battery can be broadly divided into electrode processing, assembly processing, and formation processing. Electrode processing can be further divided into active material mixing, electrode coating, rolling, slitting, and winding processes. Among these, rolling involves passing the electrode substrate between a pair of heated rolls and compressing it to a desired thickness. This reduces the thickness of the coated electrode substrate, thereby increasing capacity density and improving adhesion between the electrode current collector and the electrode active material.

[0007] In the rolling process, if residual active material or other foreign matter adheres to the rolling rolls after repeated rolling, this foreign matter may adhere to the electrodes in subsequent rolling processes, thereby degrading the quality of the electrodes and the battery containing them. Therefore, apparatuses are used to clean the rolling rolls by removing contaminants from them.

[0008] Figure 1 A conventional rolling roll cleaning device used in a rolling process is shown. An electrode 1 having an electrode mixture layer 3 applied to a current collector 2 passes between a pair of electrode rolling rolls 10. The electrode mixture layer 3 comprises an electrode active material, a conductive material, and a binder.

[0009] In the method used in the conventional electrode rolling roll cleaning device 20, while the electrode rolling roll 10 is in operation, the nozzle 22 sprays cleaning liquid 21 onto the cleaning cloth 23, the cleaning cloth 23 passes through the cleaning roller 24, and the electrode rolling roll 10 is wiped with the cleaning cloth 23 that has been sprayed with cleaning liquid, thereby manufacturing the electrode.

[0010] At this time, when cleaning the rolling roll during the manufacturing process of electrode 1 while electrode rolling roll 10 is in operation, the type and amount of cleaning fluid 21 are limited in order to maintain the residual moisture content in electrode 1, and oil-based cleaning fluid containing oil components is mainly used.

[0011] However, when using the conventional electrode rolling roll cleaning device 20, due to the characteristics of the oil-based cleaning fluid, there will be non-operation time for the electrode rolling roll 10. When rolling electrodes using water-based solvents, cleaning cannot be performed properly, and the electrode rolling roll 10 cannot be properly cleaned when the cleaning fluid 21 sprayed onto the cleaning cloth 23 evaporates / dries.

[0012] Therefore, some research has focused on using water as a cleaning solution, but this approach is limited by issues such as increased electrode thickness and moisture content, as well as the shedding of active materials. Summary of the Invention

[0013] Technical issues

[0014] The purpose of this disclosure is to provide a cleaning device with an improved supply system that can solve previously existing problems even when distilled water is used as the cleaning fluid during the cleaning of electrode rolling rolls.

[0015] However, the technical objectives to be addressed by the embodiments of this disclosure are not limited to those described above, and various extensions can be made within the scope of the technical ideas included in this disclosure.

[0016] Technical solution

[0017] According to one aspect of this disclosure, an apparatus for cleaning electrode rolling rolls is provided, comprising:

[0018] A cleaning component is provided to allow the surface of the electrode rolling roll to come into contact with the cleaning cloth.

[0019] Spray the cleaning solution onto the nozzles on the cleaning cloth.

[0020] The control unit that adjusts the spray volume of the cleaning fluid, and

[0021] A monitoring unit for monitoring the amount of cleaning fluid sprayed.

[0022] The cleaning solution is distilled water.

[0023] The control unit adjusts the amount of cleaning fluid sprayed by the nozzle in one pass to a range of 0.05 ml to 0.2 ml.

[0024] The electrode rolling roll may include an upper rolling roll located on the upper side with the electrode as a reference and a lower rolling roll located on the lower side.

[0025] The electrode rolling roll can be a hard chrome rolling roll or a DLC (diamond-like carbon) rolling roll.

[0026] The cleaning cloth may be a non-woven fabric.

[0027] The cleaning component can contact the cleaning cloth at a distance of 20% to 60% of its total width length, based on the width direction of the electrode rolling roll.

[0028] When the cleaning cloth is attached to the electrode rolling roll, the cleaning member can have an attachment pressure of 1.7 kg / cm to 2.0 kg / cm.

[0029] The nozzle can be a spray-type single-fluid nozzle.

[0030] The control unit can adjust the amount of cleaning fluid sprayed by the nozzle in one pass to the range of 0.05 ml to 0.1 ml.

[0031] The control unit includes a flow meter and can issue a command to increase the amount of cleaning fluid sprayed from the nozzle when the amount is less than 0.05 ml, and issue a command to decrease the amount of cleaning fluid when the amount exceeds 0.2 ml.

[0032] The monitoring unit can monitor the amount of cleaning fluid sprayed by the nozzle and send the information to the control unit.

[0033] The apparatus for cleaning electrode rolling rolls may further include: a cleaning cloth supply unit for supplying the cleaning cloth; and a cleaning cloth recycling unit for recycling the cleaning cloth. Attached Figure Description

[0034] Figure 1 A conventional rolling roll cleaning device used in the electrode rolling process is shown.

[0035] Figure 2 This is a schematic diagram of an electrode rolling roll cleaning apparatus according to one embodiment of the present disclosure.

[0036] Figure 3 yes Figure 2 A schematic diagram of the electrode rolling roll cleaning device in another direction.

[0037] Figure 4 The photographs show the uniformity of adhesion of the rolling rolls and cleaning components of a conventional cleaning apparatus and a cleaning apparatus according to the present disclosure, based on Experimental Example 1.

[0038] Figure 5 The photographs show the spray patterns of the rolling rolls and nozzles of the cleaning components of a conventional cleaning device and a cleaning device according to this disclosure, based on Experimental Example 1.

[0039] Figure 6 This is a graph showing the change in electrode thickness rolled by the electrode rolling rolls cleaned by the cleaning device of Example 1 according to Experimental Example 3.

[0040] Figure 7 This is a graph showing the change in electrode thickness rolled by the electrode rolling rolls cleaned by the cleaning device of Comparative Example 6 according to Experimental Example 3. Detailed Implementation

[0041] Various embodiments of this disclosure will be described in detail below with reference to the accompanying drawings to enable those skilled in the art to readily implement them. This disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0042] To clearly describe the concept of the invention, parts irrelevant to the description have been omitted, and throughout the description, the same reference numerals denote the same or similar elements.

[0043] Furthermore, since the dimensions and thicknesses of each element shown in the accompanying drawings are arbitrarily given for better understanding and ease of description, the inventive concept is not limited to the dimensions and thicknesses shown. In the drawings, the thicknesses of layers, regions, etc., are exaggerated for clarity. In the drawings, the thicknesses of some layers and regions are exaggerated for better understanding and ease of description.

[0044] Furthermore, it should be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "above" another element, it can be directly on the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" "on" another element, it means that there are no other intermediate elements present. Additionally, a portion located "above" or "on" a reference portion means that the portion is located above or below the reference portion, and does not specifically mean that the portion is located "above" or "on" in the direction opposite to gravity.

[0045] Furthermore, throughout the specification, when a section is referred to as "comprising" or "including" a component, it means that the section may further include other components without excluding them, unless otherwise stated.

[0046] Furthermore, throughout the instruction manual, when referred to as a "plane," it means the target portion viewed from above, and when referred to as a "section," it means the target portion viewed from the side of a vertically cut section.

[0047] Specific embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0048] Figure 2 This is a schematic diagram of an electrode rolling roll cleaning apparatus according to one embodiment of the present disclosure. Figure 3 yes Figure 2 A schematic diagram of the electrode rolling roll cleaning device in another direction.

[0049] Let's refer to each other. Figure 2 and Figure 3 According to one embodiment of the present disclosure, the electrode rolling roll cleaning device mainly includes a cleaning component 110, a cleaning cloth 120, and a nozzle 130 for spraying cleaning liquid 160 onto the cleaning cloth 120.

[0050] Since the cleaning member 110 must first remove foreign matter attached to the surface of the electrode rolling roll 10 after the rolling electrode 20, the cleaning member 110 is positioned as the point closest to the rolling electrode of the electrode rolling roll 10 based on the rotation direction of the electrode rolling roll 10.

[0051] Here, the electrode rolling roll 10 includes an upper rolling roll 11 located on the upper side with reference to the electrode 20 and a lower rolling roll 12 located on the lower side.

[0052] At this time, if the electrode 20 forms an electrode layer only on one side of the current collector, the cleaning device 100 can be positioned and operated at the location where the electrode layer is formed. If the electrode forms an electrode layer on both sides, the cleaning device 100 can be formed and operated on both sides, so that both the upper rolling roll 11 and the lower rolling roll 12 can be cleaned.

[0053] The type of electrode rolling roll 10 that can be used with the cleaning device 100 according to this disclosure is not limited, and examples of it may be hard chrome rolling rolls or DLC (diamond like carbon) rolling rolls.

[0054] The cleaning member 110 may be, for example, in the shape of a cleaning roller (drum), and may rotate, for example, in a direction opposite to the rotation direction of the electrode rolling roller 10. If the contact portion between the cleaning member 110 and the electrode rolling roller 10 is arc-shaped, the electrode rolling roller 10 may be prevented from being damaged by the cleaning cloth 120 when it comes into contact with the electrode rolling roller 10.

[0055] Furthermore, the cleaning member 110 may be a cleaning roller configured to move in the width direction of the electrode rolling roller 10. Therefore, based on the width direction of the electrode rolling roller 10, the contact length ℓs between the electrode rolling roller 10 and the cleaning cloth 120 may be formed to be 20% to 60% of the total width length ℓ, more specifically 20% to 40%.

[0056] Thus, the cleaning component 110 can be uniformly attached to the electrode rolling roll 10 as a whole.

[0057] In existing cleaning devices, the cleaning components are attached to the entire width of the electrode rolling roll. This causes problems, especially as the width length increases, the adhesion pressure in the width direction becomes uneven and decreases, making cleaning inadequate.

[0058] However, according to this disclosure, the width of the cleaning member 110 is reduced so that it is formed only on a portion of the electrode rolling roll 10 in the width direction, and the cleaning member 110 is configured to be movable in the width direction so that the pressure of the cleaning member 110 adhering to the electrode rolling roll 10 can be uniform in the width direction, and the adhesion pressure can also be increased.

[0059] Therefore, according to this disclosure, when the cleaning member 110 attaches the cleaning cloth 120 to the electrode rolling roll 10, the attachment pressure can be from 1.7 kg / cm to 2.0 kg / cm, specifically from 1.8 kg / cm to 2.0 kg / cm, and more specifically from 1.9 kg / cm to 2.0 kg / cm, thereby improving the cleaning effect.

[0060] Furthermore, this disclosure is not limited to those shown in the figures; any structure and shape is feasible as long as the cleaning cloth 120 can be supplied to the cleaning member 110 to clean the surface of the electrode rolling roll 10, and can be modified and changed in various ways depending on the environment in which this disclosure is applied. Furthermore, as... Figure 3As shown in the schematic diagram, the cleaning member 110 can be configured as a single cleaning member capable of moving in the width direction, but two or more cleaning members can also be provided in the circumferential direction of the electrode rolling roll 10, and the cleaning members can be formed at different positions in the width direction, so that cleaning is completely performed in the width direction of the electrode rolling roll 10. There is no particular limitation on the number of cleaning members 110.

[0061] Meanwhile, according to embodiments of this disclosure, the cleaning cloth 120 is supplied from the cleaning cloth supply unit 140 and conveyed to the cleaning member 110. For example, in the cleaning cloth supply unit 140, the long sheet-shaped cleaning cloth 120 can be wound into a roll, and the cleaning cloth 120 unwound from the cleaning cloth supply unit 140 can be conveyed to the cleaning member 110. The cleaning member 110 is positioned adjacent to the surface of the electrode rolling roller 10, such that one surface of the cleaning cloth 120 can contact the electrode rolling roller 10. That is, the cleaning cloth 120 contacts the electrode rolling roller 10 as it passes between the electrode rolling roller 10 and the cleaning member 110, thereby cleaning the electrode rolling roller 10.

[0062] The cleaning cloth 120, after passing through the cleaning member 110, is retrieved by the cleaning cloth retrieval unit 150. For example, the cleaning cloth retrieval unit 150 may be configured to roll the cleaning cloth 120 into a roll. In other words, each of the cleaning cloth supply unit 140 and the cleaning cloth retrieval unit 150 may be manufactured, for example, in the form of a cylindrical bar or spool to unfold and roll the cleaning cloth 120. Depending on the direction of movement of the cleaning cloth 120, the cleaning member 110 may rotate simultaneously, and the cleaning cloth supply unit 140 and the cleaning cloth retrieval unit 150 may also rotate in the same manner.

[0063] The cleaning cloth 120 can smoothly absorb or remove foreign matter adhering to the electrode rolling roller 10, and its type is not limited, as long as it does not damage the surface of the electrode rolling roller 10. For example, non-woven fabric can be used. In addition, the type of non-woven fabric material is not limited, as long as it can absorb or remove foreign matter, and non-woven fabrics made of cotton fiber, polyethylene fiber, polypropylene fiber, polyester, aramid fiber, cellulose fiber, rayon fiber, or a blend of these materials can be used.

[0064] According to one embodiment of the present disclosure, a rolling mill cleaning device 100 can spray cleaning liquid 160 towards a cleaning cloth 120 through a nozzle 130.

[0065] Here, based on the direction of movement of the cleaning cloth 120, the nozzle 130 can be disposed at the front end of the cleaning member 110. In addition, if multiple cleaning members 110 are provided, the nozzle 130 can be disposed between the various cleaning members 110.

[0066] like Figure 2As shown, nozzle 130 can be of the type that sprays cleaning fluid 160 onto cleaning cloth 120, for example, in a spray manner. In this case, nozzle 130 can include, for example, a single-fluid nozzle and / or a dual-fluid nozzle. When a single-fluid nozzle is used in the cleaning fluid supply unit 130, splashing of cleaning fluid 160 can be prevented more effectively than in the case of a dual-fluid nozzle.

[0067] like Figure 2 As shown, the nozzle 130 can supply (spray) cleaning fluid 160 onto the surface of the cleaning cloth 120 opposite to the surface facing the electrode rolling roll 10 (i.e., the surface of the cleaning cloth 120 that contacts the electrode rolling roll 10). In this case, when the cleaning cloth 120 supplied with cleaning fluid 160 comes into contact with the electrode rolling roll 10, it can prevent the cleaning fluid 160 from dripping onto the electrode 1 and causing liquid leakage. Furthermore, although in Figure 2 Not shown in detail, nozzle 130 can be connected to a cleaning fluid reservoir, a cleaning fluid delivery pipe, a pump, a valve, etc.

[0068] In addition, multiple nozzles 130 can be configured.

[0069] Figure 2 The illustration shows a nozzle 130 disposed on the rear surface of the cleaning cloth 120 to supply cleaning fluid 160 to the cleaning cloth 120. However, this disclosure is not limited to this; the nozzle 130 may also be disposed on the front surface of the cleaning cloth 120, or both the front and rear surfaces. That is, as long as the cleaning fluid 160 supplied to the cleaning cloth 120 is sufficient to clean the electrode rolling roll 10, various modifications and variations can be made to the embodiment. Here, the front surface of the cleaning cloth 120 refers to the surface that contacts the electrode rolling roll 10, and the rear surface of the cleaning cloth 120 refers to the surface opposite to the surface that contacts the electrode rolling roll 10.

[0070] In this case, cleaning solution 160 can be distilled water.

[0071] According to this disclosure, considering that water is used as a solvent at the negative electrode, the problem with oil as a previously used cleaning fluid is that not only can contaminants not be adequately cleaned, but the cleaning time is also increased because evaporation takes time, etc.

[0072] Therefore, distilled water, similar to the solvent of the negative electrode, is used as the cleaning solution 160, thereby solving the problem of using oil, which helps to remove contaminants and is efficient in terms of cost and time.

[0073] However, when distilled water is used as cleaning solution 160 in this disclosure, the amount of cleaning solution 160 sprayed is very important.

[0074] This is because if the spraying amount is too large, problems such as increased thickness and moisture content of electrode 20 and shedding of active material may occur. Conversely, if the spraying amount is too small, the surface contamination of electrode rolling roll 10 cannot be adequately cleaned.

[0075] Therefore, according to this disclosure, the amount of cleaning fluid 160 sprayed once by nozzle 130 can be about 0.05 ml to 0.2 ml, specifically 0.05 ml to 0.1 ml, and more specifically 0.05 ml to 0.07 ml.

[0076] The amount of cleaning liquid 160 sprayed is determined by a monitoring unit 170 that monitors the amount of cleaning liquid 160 sprayed and a control unit 180 that receives information from the monitoring unit 170 and adjusts the amount of cleaning liquid 160 sprayed.

[0077] Specifically, the electrode rolling roll cleaning device 100 according to this disclosure further includes a monitoring unit 170. The monitoring unit 170 is, for example, a flow sensor mounted at the front end of the nozzle 130. The monitoring unit 170 can measure the flow rate of the cleaning fluid 160 sprayed at a real-time varying flow rate and send the obtained information to the control unit 180.

[0078] In this case, the spray volume is measured by the monitoring unit and can be measured non-contactly by the ultrasonic time difference method, which sends ultrasonic waves in the upward / downward direction relative to the spray direction of the cleaning liquid 160.

[0079] The control unit 180 can receive information sent from the monitoring unit 170, and can issue a command to increase the amount of cleaning fluid 160 sprayed by the nozzle when the amount is less than 0.05 ml, and issue a command to decrease the amount of cleaning fluid when the amount exceeds 0.2 ml.

[0080] In this configuration, the control unit 180 may include a flow meter 181, which measures the flow rate to precisely control the flow rate of the cleaning fluid 160 supplied from a cleaning fluid reservoir to the nozzle 130, the cleaning fluid reservoir supplying the cleaning fluid 160 separately to the nozzle 130.

[0081] Furthermore, it goes without saying that the electrode rolling roll cleaning device 100 may further include an inspection unit for measuring the brightness value of the surface of the electrode rolling roll 10 to determine the degree of contamination, a drying unit for heating and / or blowing air to dry the surface of the electrode rolling roll 10 cleaned by the cleaning liquid 160, etc.

[0082] The following describes embodiments that aid in understanding this disclosure. Specifically, when using the cleaning apparatus according to this disclosure and distilled water as the cleaning fluid, the description, aided by experimental examples, demonstrates excellent cleaning characteristics regardless of the type of electrode rolling roll. However, it should be noted that the following embodiments are provided for illustrative purposes only, and the scope of this disclosure is not limited thereto.

[0083] <Experimental Example 1>

[0084] Using a conventional cleaning device (full-width coating type for rolling rolls, flat nozzle) and a cleaning device according to this disclosure (narrow-width coating type for rolling rolls, spray type single-fluid nozzle), the adhesion pressure, adhesion uniformity, and cleaning fluid spray volume on the electrode rolling rolls were measured. The results are shown in Table 1 below. Figure 4 and Figure 5 In this case, distilled water (DI water) is used as the cleaning solution.

[0085] At this point, the adhesion pressure is a value obtained by converting the air pressure applied to the cylinder (the cylinder is used to attach the cleaning component of the cleaning device to the electrode rolling roll) into a force (pressure x cross-sectional area of ​​the cylinder's inner diameter) adhering to the electrode rolling roll and dividing it into units of length (the length in contact with the rolling roll).

[0086] The spray volume of the cleaning fluid is measured by a flow sensor installed at the front end of the nozzle and by ultrasonic time difference method, which transmits ultrasonic waves in an upward / downward direction relative to the spray direction of the cleaning fluid 160.

[0087] Measurements were taken at temperatures ranging from -10 to 60 degrees Celsius (without freezing) and humidity levels ranging from 35% RH to 85% RH.

[0088] The flow sensor has a vibration resistance of 10 Hz to 55 Hz, a dual amplitude of 1.5 mm, and a vibration resistance of 2 hours in the x / y / z directions. It also has an impact resistance of 50G, 11ms, and 3 shocks in the x / y / z directions.

[0089] [Table 1]

[0090] Adhesion pressure (kg / cm) Cleaning solution spray volume (ml) Cleaning devices based on existing technology 1.69 0.6 Cleaning apparatus according to this disclosure 1.94 0.06

[0091] Refer to Table 1 and Figure 4 and Figure 5 It can be confirmed that, compared with the cleaning device according to the prior art, the electrode rolling roll cleaning device according to this disclosure has a smaller adhesion area between the electrode rolling roll and the cleaning cloth, thereby improving the adhesion uniformity and increasing the adhesion pressure. Furthermore, it can be confirmed that the amount of cleaning fluid sprayed is reduced to approximately 1 / 10.

[0092] <Comparative Example 1>

[0093] A cleaning device based on existing technology (full-width coating type for rolling rolls, flat nozzle, spray volume per pass: 0.6 ml) is used, and oil is used as the cleaning fluid. HCr (hard chrome rolling roll) is used as the electrode rolling roll.

[0094] <Comparative Example 2>

[0095] The cleaning apparatus according to this disclosure (narrow adhesion type for rolling rolls, single-fluid spray nozzle, spray volume per stroke: 0.06 ml) is used, but oil is used as the cleaning fluid. HCr (hard chrome rolling roll) is used as the electrode rolling roll.

[0096] <Comparative Example 3>

[0097] A cleaning device based on existing technology (full-width coating type for rolling mills, flat nozzle, spray volume per pass: 0.6 ml) is used, and oil is used as the cleaning fluid. DLC (diamond-like carbon rolling mill) is used as the electrode rolling mill.

[0098] <Comparative Example 4>

[0099] The cleaning apparatus according to this disclosure (narrow adhesion type for rolling mills, single-fluid spray nozzle, spray volume per stroke: 0.06 ml) is used, but oil is used as the cleaning fluid. DLC (diamond-like carbon rolling mill) is used as the electrode rolling mill.

[0100] <Example 1>

[0101] The cleaning apparatus according to this disclosure (narrow adhesion type for rolling rolls, single-fluid spray nozzle, spray volume per stroke: 0.06 ml) is used, but distilled water (DI water) is used as the cleaning solution. HCr (hard chrome rolling roll) is used as the electrode rolling roll.

[0102] <Example 2>

[0103] The cleaning apparatus according to this disclosure (narrow adhesion type for rolling rolls, single-fluid spray nozzle, spray volume per stroke: 0.06 ml) is used, but distilled water (DI water) is used as the cleaning fluid. DLC (diamond-like carbon rolling roll) is used as the electrode rolling roll.

[0104] <Example 3>

[0105] Except for adjusting the spray volume to 0.08 ml per application, prepare the product in the same manner as in Example 1.

[0106] <Comparative Example 5>

[0107] Except for adjusting the spray volume to 0.03 ml per application, prepare in the same manner as in Example 1.

[0108] <Comparative Example 6>

[0109] Except for adjusting the spray volume to 0.25 ml per application, prepare the product in the same manner as in Example 1.

[0110] <Experimental Example 2>

[0111] The color difference values ​​before and after cleaning the electrode rolling roll were compared to confirm the cleaning effect, and the results are shown in Table 2 below.

[0112] Here, a colorimeter is used to measure the color difference value (L*: perceived brightness (black / white)). In the case of HCr rolling rolls, a higher color difference value indicates a cleaner condition. In the case of DLC rolling rolls, a lower color difference value indicates a cleaner condition.

[0113] [Table 2]

[0114] Before cleaning After cleaning Example 1 85.43 84.96 Example 2 8.57 8.69 Example 3 83.47 84.27 Comparative Example 1 84.03 66.41 Comparative Example 2 84.73 70.19 Comparative Example 3 6.08 19.27 Comparative Example 4 10.67 9.99 Comparative Example 5 84.26 71.24 Comparative Example 6 84.91 84.92

[0115] Referring to Table 2, in order to obtain excellent cleaning results regardless of the type of electrode rolling roll, distilled water is used as the cleaning fluid when using the cleaning apparatus of this disclosure. However, as can be seen from Comparative Example 5, the cleaning effect decreases when the amount of distilled water sprayed is too small.

[0116] <Experimental Example 3>

[0117] After cleaning the electrode rolling rolls according to Example 1 and Comparative Example 6, the thickness of the electrode rolled by the electrode rolling rolls was measured, and the results are shown in... Figure 6 and Figure 7 middle.

[0118] Thickness is measured using a thickness measuring device with a confocal sensor. In the method of measuring thickness using a confocal sensor, there is a displacement sensor on the upper and lower sides, each sensor facing each other and sharing a focal point. The two sensors sharing the focal point are used to measure a reference film with a known existing thickness (serving as a scale for the confocal sensor), and the distance from each sensor to the reference film is calculated. Then, the thickness is measured while the sensor is moved in the width direction of the electrode.

[0119] Regarding the electrode, artificial graphite is used as the negative electrode active material, and the negative electrode active material, conductive material (CNT), styrene-butadiene rubber (SBR) as a binder and carboxymethyl cellulose (CMC) as an additive are mixed in water at a weight ratio of 98:0.5:1:0.5 to prepare a negative electrode slurry. The negative electrode slurry is then coated onto a Cu foil of about 185 mm thickness to a thickness of 8 mm, dried at 130°C, and then rolled to produce a negative electrode for use.

[0120] As can be seen, in the case of Example 1, the thickness did not change significantly compared to when the negative electrode was first produced. However, in the case of Comparative Example 6, cleaning was performed with a larger spray volume to ensure that the cleaning was properly performed. However, the undried distilled water affected the electrode moisture content, resulting in electrode surface defects and thickness changes.

[0121] Although preferred embodiments of the present disclosure have been shown and described above, the scope of the present disclosure is not limited thereto, and those skilled in the art can make many other changes and modifications to the embodiments using the basic principles of the invention as defined in the appended claims, which also fall within the spirit and scope of the invention.

[0122] [Explanation of reference numerals in the attached figures]

[0123] 10: Electrode rolling rolls

[0124] 100: Electrode rolling roll cleaning device

[0125] 110: Cleaning components

[0126] 120: Cleaning cloth

[0127] 130: Nozzle

[0128] 140: Cleaning cloth supply unit

[0129] 150: Cleaning cloth recycling unit

[0130] 160: Cleaning solution

[0131] 170: Monitoring Unit

[0132] 180: Control Unit

[0133] 181: Flow meter

[0134] Industrial applicability

[0135] According to this disclosure, distilled water is used as a cleaning fluid when cleaning electrode rolling rolls; therefore, when water is used as a solvent for the electrodes, it helps to clean the electrode rolling rolls.

[0136] Furthermore, by using a spray-type single-fluid nozzle and adjusting the amount of distilled water used as the cleaning solution to a very small quantity, problems such as increased electrode thickness and moisture content, as well as active material shedding, which could normally occur due to the use of distilled water as the cleaning solution, are eliminated.

[0137] The effects of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the description of the appended claims any additional effects not described above.

Claims

1. An apparatus for cleaning electrode rolling rolls, comprising: A cleaning component is provided to allow the surface of the electrode rolling roll to come into contact with the cleaning cloth. Spray the cleaning solution onto the nozzles on the cleaning cloth. The control unit that adjusts the spray volume of the cleaning fluid, and A monitoring unit for monitoring the amount of cleaning fluid sprayed. The cleaning solution is distilled water. The control unit adjusts the amount of cleaning fluid sprayed by the nozzle in one pass to a range of 0.05 ml to 0.2 ml.

2. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The electrode rolling roll includes an upper rolling roll located on the upper side with the electrode as a reference and a lower rolling roll located on the lower side.

3. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The electrode rolling roll is a hard chrome rolling roll or a DLC (diamond-like carbon) rolling roll.

4. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The cleaning cloth is a non-woven fabric.

5. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The cleaning component contacts the cleaning cloth at a distance of 20% to 60% of its total width length, based on the width direction of the electrode rolling roll.

6. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: When the cleaning cloth is attached to the electrode rolling roll, the cleaning member has an attachment pressure of 1.7 kg / cm to 2.0 kg / cm.

7. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The nozzle is a spray-type single-fluid nozzle.

8. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The control unit adjusts the amount of cleaning fluid sprayed by the nozzle in one pass to the range of 0.05 ml to 0.1 ml.

9. The apparatus for cleaning electrode rolling rolls according to claim 11, wherein: The control unit includes a flow meter, and the control unit adjusts the amount of cleaning fluid sprayed by the nozzle, issuing a command to increase the amount of cleaning fluid when the amount is less than 0.05 ml, and issuing a command to decrease the amount of cleaning fluid when the amount exceeds 0.2 ml.

10. The apparatus for cleaning electrode rolling rolls according to claim 1, wherein: The monitoring unit monitors the amount of cleaning fluid sprayed by the nozzle and sends the information to the control unit.

11. The apparatus for cleaning electrode rolling rolls according to claim 1, further comprising: A cleaning cloth supply unit that supplies the cleaning cloth; and A cleaning cloth recycling unit for recycling the cleaning cloth.

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