Apparatus for cleaning electrode rolling roll

Abstract

According to one embodiment of the present invention, an apparatus for cleaning an electrode rolling roll is provided, the apparatus comprising: a cleaning member provided such that the surface of an electrode rolling roll and a cleaning cloth can be in contact with each other; a spray nozzle for spraying a cleaning solution at the cleaning cloth; a control unit for adjusting the spray amount of the cleaning solution; and a monitoring unit for monitoring the spray amount of the cleaning solution, wherein the cleaning solution is distilled water, and the control unit adjusts, to be 0.05-0.2 mL, the amount of the cleaning solution sprayed once by the spray nozzle.

Description

Electrode rolling roll cleaning device

[0001] The present invention relates to an electrode rolling roll cleaning device, and more specifically, to a cleaning device having an improved method of supplying a cleaning liquid when cleaning a rolling roll.

[0002] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has led to active development of related technologies. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution issues caused by conventional gasoline-powered vehicles. This, in turn, heightens the need for further development of these batteries.

[0003] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0004] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0005] These secondary batteries are widely used not only in small devices like portable electronic devices, but also in medium- to large-scale devices like electric vehicles and energy storage systems (ESS), and their use is rapidly increasing. Furthermore, the use of residential battery packs for power storage has been on the rise recently.

[0006] The manufacturing process of these lithium secondary batteries is largely divided into three stages: electrode process, assembly process, and formation process. The electrode process is further divided into active material mixing process, electrode coating process, rolling process, slitting process, and winding process. Among these, the rolling process is a process in which the electrode substrate is passed between a pair of rolling rolls heated at a high temperature to compress it to a desired thickness in order to reduce the thickness of the electrode substrate after the coating process to increase the capacity density and increase the adhesion between the electrode current collector and the electrode active material.

[0007] In this rolling process, if the active material or other foreign substances remaining after rolling are attached to the rolls during rolling as the rolling is repeated, the foreign substances may be attached to the electrodes during the subsequent rolling process, thereby reducing the quality of the electrodes and the batteries including the electrodes. Therefore, a rolling roll cleaning device is used to remove contamination from the rolling rolls.

[0008] Figure 1 illustrates a conventional rolling roll cleaning device used in a rolling process. An electrode substrate (1) having an electrode mixture layer (3) applied on a current collector (2) passes between a pair of rolling rolls (10). The electrode mixture layer (3) includes an electrode active material, a conductive material, and a binder.

[0009] In a conventional electrode rolling roll cleaning device (20), a cleaning solution (21) is sprayed onto a cleaning cloth (23) through a nozzle (22) while the rolling roll (10) is driven for electrode manufacturing, and the cleaning cloth (23) passes through a cleaning roller (24), and the rolling roll (10) is cleaned with the cleaning cloth (23) onto which the cleaning solution has been sprayed.

[0010] At this time, when cleaning the rolling roll during the process of manufacturing the electrode (1) while the rolling roll (10) is driven, there are restrictions on the type and amount of cleaning liquid (21) used to maintain the amount of residual moisture in the electrode (1), and an oil-based cleaning liquid containing an oil component is mainly used.

[0011] Meanwhile, when using a conventional electrode rolling roll cleaning device (20), due to the nature of using an oil-based cleaning solution, the rolling roll (10) is downtimed. When an aqueous solvent is used for electrode rolling, not only is cleaning not performed properly, but there are also cases where the cleaning solution (21) sprayed on the cleaning cloth (23) evaporates / dries, and the rolling roll (10) is not properly cleaned, resulting in various problems.

[0012] Accordingly, there has been research on using water as a cleaning solution, but in this case, there were limitations due to problems such as electrode thickness, moisture increase, and active material detachment.

[0013] The purpose of the present invention is to provide a cleaning device with an improved supply method that can solve problems that have occurred in the past while using distilled water as a cleaning liquid during cleaning of an electrode rolling roll.

[0014] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0015] A device for cleaning an electrode rolling roll according to one embodiment of the present invention,

[0016] A cleaning member provided so that the surface of the electrode rolling roll and the cleaning cloth can come into contact,

[0017] A spray nozzle that sprays a cleaning solution onto the above cleaning cloth,

[0018] A control unit for controlling the amount of spray of the above cleaning solution, and

[0019] It includes a monitoring unit that monitors the amount of the cleaning solution sprayed,

[0020] The above cleaning solution is distilled water,

[0021] The above control unit is characterized in that it adjusts the amount of cleaning solution sprayed at one time by the spray nozzle to be in the range of 0.05 ml to 0.2 ml.

[0022] The above electrode rolling roll may include an upper rolling roll positioned above the electrode and a lower rolling roll positioned below the electrode.

[0023] The above electrode rolling roll may be a hard chrome rolling roll or a DLC (diamond like carbon) rolling roll.

[0024] The above cleaning cloth may be a non-woven fabric.

[0025] The above cleaning member may contact the cleaning cloth at 20 to 60% in the width direction of the electrode rolling roll.

[0026] The above cleaning member may have an attachment pressure of 1.7 kg / cm to 2.0 kg / cm when attaching a cleaning cloth to the electrode rolling roll.

[0027] The above injection nozzle may be a spray type one-piece fluid nozzle.

[0028] The above control unit may be configured to adjust the amount of cleaning solution sprayed at one time by the spray nozzle to a range of 0.05 ml to 0.1 ml.

[0029] The above control unit may include a flow meter, and may command to increase the amount of the cleaning liquid sprayed by the spray nozzle when the amount is less than 0.05 ml, and may command to decrease the amount when the amount of the cleaning liquid exceeds 0.2 ml.

[0030] The above monitoring unit may monitor the amount of cleaning liquid sprayed by the spray nozzle and transmit information to the control unit.

[0031] It may further include a cleaning cloth supply unit for supplying the cleaning cloth; and a cleaning cloth recovery unit for recovering the cleaning cloth.

[0032] Figure 1 shows a conventional electrode rolling roll cleaning device used in an electrode rolling process.

[0033] Figure 2 is a schematic diagram of an electrode rolling roll cleaning device according to one embodiment of the present invention.

[0034] Figure 3 is a schematic diagram of the electrode rolling roll cleaning device of Figure 2 from another direction.

[0035] Figure 4 is a comparative photograph showing the uniformity of attachment of the rolling roll and cleaning member of the conventional cleaning device according to Experimental Example 1 and the cleaning device according to the present invention.

[0036] Figure 5 is a photograph comparing the nozzle spray shapes of the rolling roll and cleaning member of the conventional cleaning device according to Experimental Example 1 and the cleaning device according to the present invention.

[0037] Figure 6 is a graph showing the change in electrode thickness rolled using an electrode rolling roll cleaned by the cleaning device of Example 1 according to Experimental Example 3.

[0038] Figure 7 is a graph showing the change in electrode thickness when rolled using an electrode rolling roll cleaned by the cleaning device of Comparative Example 6 according to Experimental Example 3.

[0039] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0040] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0041] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0042] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0043] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0044] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0045]

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0047] FIG. 2 is a schematic diagram of an electrode rolling roll cleaning device according to one embodiment of the present invention, and FIG. 3 is a schematic diagram of the electrode rolling roll cleaning device from another direction.

[0048] Referring to FIGS. 2 and 3 together, a rolling roll cleaning device (100) according to one embodiment of the present invention largely includes a cleaning member (110), a cleaning cloth (120), and a spray nozzle (130) that sprays a cleaning liquid (160) onto the cleaning cloth (120).

[0049] Since the cleaning member (110) must first remove foreign substances attached to the surface of the electrode rolling roll (10) after the electrode (20) is rolled, it is positioned closest to the point where the electrode rolling roll (10) rolls the electrode, based on the rotation direction of the electrode rolling roll (10).

[0050] Here, the electrode rolling roll (10) includes an upper rolling roll (11) located above the electrode (20) and a lower rolling roll (12) located below it.

[0051] 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, and if the electrode layers are formed on both sides, the cleaning device (100) can be formed and operated on both sides so as to be able to clean both the upper rolling roll (11) and the lower rolling roll (12).

[0052] There is no limitation on the type of electrode rolling roll (10) to which the cleaning device (100) according to the present invention can be applied, and for example, it may be a hard chrome rolling roll or a DLC (diamond like corbon) rolling roll.

[0053] The cleaning member (110) may be, for example, in the shape of a cleaning roll (roller), and may rotate, for example, in the direction opposite to the rotation direction of the rolling roll (10). When the contact portion between the cleaning member (110) and the rolling roll (10) is rounded, when the cleaning cloth (120) comes into contact with the rolling roll (10), the rolling roll (10) can be prevented from being damaged by the cleaning cloth (120).

[0054] In addition, the cleaning member (110) may be a cleaning roll that can move in the width direction of the electrode rolling roll (10). Therefore, the length (l) at which the electrode rolling roll (10) and the cleaning cloth (120) contact each other s ) can be formed to be 20 to 60% of the full width length (l) based on the width direction of the electrode rolling roll (10), specifically 20 to 40%.

[0055] Accordingly, the cleaning member (110) can perform uniform attachment to the electrode rolling roll (10) as a whole.

[0056] In the existing cleaning device, the cleaning member was attached to the entire width of the electrode rolling roll, and in particular, as the width length was longer, the attachment pressure in the width direction was uneven and the attachment pressure was also reduced, so there was a problem that cleaning was not performed well.

[0057] However, according to the present invention, the width of the cleaning member (110) is reduced so that it is formed only in a portion of the width direction of the electrode rolling roll (10), and it is formed so that it can move in the width direction, so that the pressure with which the cleaning member (110) is attached to the electrode rolling roll (10) can be uniform in the width direction, and the attachment pressure can also be improved.

[0058] Therefore, according to the present invention, when the cleaning member (110) attaches the cleaning cloth (120) to the electrode rolling roll (10), the attachment pressure may be 1.7 kg / cm to 2.0 kg / cm, specifically 1.8 kg / cm to 2.0 kg / cm, and more specifically 1.9 kg / cm to 2.0 kg / cm, and the cleaning effect may be improved.

[0059] Furthermore, the present invention is not limited to what is illustrated, and it is sufficient if the cleaning member (110) has a structure and shape that can clean the surface of the electrode rolling roll (10) by supplying a cleaning cloth (120), and can be variously modified and changed to suit the environment to which the present invention is applied. In addition, the cleaning member (110) may be provided as one that can move in the width direction as shown in the schematic diagram of FIG. 3, but may be provided as two or more in the circumferential direction of the electrode rolling roll (10) so that cleaning of the electrode rolling roll (10) in the width direction can be performed, and may be formed with different positions in the width direction, and there is no particular limitation on the number of cleaning members (110).

[0060] Meanwhile, according to embodiments of the present invention, the cleaning cloth (120) is supplied from the cleaning cloth supply unit (140) and transported to the cleaning member (110). For example, the cleaning cloth supply unit (140) may be a long cleaning cloth (120) in the form of a sheet wound in a roll shape, and the cleaning cloth (120) unwound from the cleaning cloth supply unit (140) may be transported to the cleaning member (110). The cleaning member (110) is adjacent to the surface of the electrode rolling roll (10), so that one surface of the cleaning cloth (120) can be brought into contact with the electrode rolling roll (10). That is, the cleaning cloth (120) passes between the electrode rolling roll (10) and the cleaning member (110) and comes into contact with the electrode rolling roll (10), thereby cleaning the electrode rolling roll (10).

[0061] The cleaning cloth (120) that has passed the cleaning member (110) is recovered in the cleaning cloth recovery unit (150). For example, the cleaning cloth recovery unit (150) may be configured to wind the cleaning cloth (120) in a roll shape. In other words, each of the cleaning cloth supply unit (140) and the cleaning cloth recovery unit (150) may be manufactured in the form of a cylindrical bar or bobbin, for example, to unwind and wind the cleaning cloth (120). The cleaning member (110) may rotate simultaneously with the moving direction of the cleaning cloth (120), and the cleaning cloth supply unit (140) and the cleaning cloth recovery unit (150) may also rotate in the same manner.

[0062] The cleaning cloth (120) can smoothly absorb or remove foreign substances attached to the electrode rolling roll (10) and does not damage the surface of the electrode rolling roll (10), and there is no limitation on its type. For example, a non-woven fabric can be used. In addition, the material of the non-woven fabric is not limited as long as it can absorb or remove foreign substances, and cotton fiber, polyethylene fiber, polypropylene fiber, polyester, aramid fiber, cellulose fiber, rayon fiber, or a non-woven fabric mixed with these can be used.

[0063] A rolling roll cleaning device (100) according to one embodiment of the present invention can spray a cleaning solution (160) toward a cleaning cloth (120) through a spray nozzle (130).

[0064] Here, the spray nozzle (130) can be placed at the front end of the cleaning member (110) based on the direction of movement of the cleaning cloth (120), and additionally, when a plurality of cleaning members (110) are provided, it can be placed between each cleaning member (110).

[0065] The spray nozzle (130) may be, for example, a type that sprays the cleaning solution (160) onto the cleaning cloth (120) in a spray manner, as illustrated in FIG. 2. At this time, the spray nozzle (130) may include, for example, a one-fluid nozzle and / or a two-fluid nozzle. When a one-fluid nozzle is employed in the cleaning solution supply unit (130), the scattering of the cleaning solution (160) can be prevented more effectively than when a two-fluid nozzle is employed.

[0066] As illustrated in FIG. 2, the spray nozzle (130) can supply (spray) the cleaning liquid (160) to the opposite side of the surface of the cleaning cloth (120) facing the rolling roll (10) (the surface on which the cleaning cloth (120) comes into contact with the rolling roll (10). In this case, when the cleaning cloth (120) supplied with the cleaning liquid (160) comes into contact with the rolling roll (10), the cleaning liquid (160) can be prevented from dripping onto the electrode (1) as a leak or the like. In addition, although not illustrated in detail in FIG. 2, the spray nozzle (130) can be connected to a cleaning liquid storage tank, a cleaning liquid transport pipe, a pump, a valve, or the like.

[0067] Additionally, a plurality of injection nozzles (130) may be provided.

[0068] In Fig. 2, the spray nozzle (130) is arranged on the rear side of the cleaning cloth (120) to supply the cleaning liquid (160) to the cleaning cloth (120). However, the present invention is not limited thereto, and the spray nozzle (130) may be arranged on the front side of the cleaning cloth (120) or on both the front and rear sides. That is, it is sufficient if the cleaning liquid (160) can be supplied to an extent that the electrode rolling roll (10) can be cleaned by the cleaning cloth (120), and various modifications and changes are possible. Here, the front side of the cleaning cloth (120) means the side that comes into contact with the electrode rolling roll (10), and the rear side of the cleaning cloth (120) means the side opposite to the side that comes into contact with the electrode rolling roll (10).

[0069] At this time, the cleaning solution (160) may be distilled water.

[0070] According to the present invention, the oil used as a conventional cleaning liquid, considering that the cathode electrode uses water as a solvent, not only does not sufficiently clean contamination, but also takes time for volatilization, etc., so there is a problem that the cleaning time increases.

[0071] Accordingly, by using distilled water as the cleaning solution (160) in the same manner as the solvent of the negative electrode, the problem of using the oil is solved, and not only is the removal of contamination easy, but it is also efficient in terms of cost and time.

[0072] However, in the case of using distilled water as the cleaning solution (160) as in the present invention, the spray amount of the cleaning solution (160) is very important.

[0073] If the spray amount is too large, problems such as an increase in the thickness and moisture content of the electrode (20) and delamination of the active material may occur, and conversely, if the spray amount is too small, contamination on the surface of the electrode rolling roll (10) is not sufficiently cleaned.

[0074] Therefore, according to the present invention, the amount of cleaning solution (160) sprayed at one time by the spray nozzle (130) may 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.

[0075] The amount of the sprayed cleaning solution (160) is controlled by a monitoring unit (170) that monitors the spray amount of the cleaning solution (160) and a control unit (180) that receives information from the monitoring unit (170) and adjusts the spray amount of the cleaning solution (160).

[0076] Specifically, the electrode rolling roll cleaning device (100) according to the present invention additionally includes a monitoring unit (170). The monitoring unit (170) is, in one example, a flow sensor installed at the front end of a spray nozzle (130), and can measure the flow rate of the cleaning liquid (160) sprayed at a flow rate that changes in real time, and transmits the information obtained therefrom to the control unit (180).

[0077] At this time, the measurement of the spray amount is measured by the monitoring unit and can be measured in a non-contact manner through a radio time difference method that transmits ultrasonic waves in an upward / downward direction with respect to the spray direction of the cleaning solution (160).

[0078] The control unit (180) can receive this information from the monitoring unit (170) and, if the amount of the cleaning solution (160) sprayed by the spray nozzle (130) is less than 0.05 ml, command the amount to be increased, and if the amount of the cleaning solution exceeds 0.2 ml, command the amount to be reduced.

[0079] At this time, the control unit (180) may include a flow meter (181), and the flow meter (181) may measure the flow rate so as to precisely control the flow rate of the cleaning solution (160) supplied to the spray nozzle (130) from a cleaning solution storage tank that supplies a separate cleaning solution (160) to the spray nozzle (130).

[0080] In addition, the electrode rolling roll cleaning device (100) may further include an inspection unit that measures the brightness value of the surface of the electrode rolling roll (10) to determine the degree of contamination, a drying unit that dries the surface of the electrode rolling roll (10) cleaned with a cleaning solution (160) by heating and / or blowing air, etc.

[0081]

[0082] Hereinafter, examples are disclosed to aid understanding of the present invention. Specifically, experimental examples demonstrate that when a cleaning device according to the present invention is used and distilled water is used as a cleaning solution, excellent cleaning properties are achieved regardless of the type of electrode rolling roll. However, the following examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0083]

[0084] Experimental Example 1

[0085] The adhesion pressure, adhesion uniformity, and cleaning solution spray amount on the electrode rolling roll were measured using a conventional cleaning device (rolling roll full width attachment type, flat nozzle) and a cleaning device according to the present invention (rolling roll narrow width attachment type, spray hydraulic nozzle), and the results are shown in Table 1 and Figures 4 and 5 below. At this time, distilled water (DI water) was used as the cleaning solution.

[0086] At this time, the attachment pressure is the value obtained by converting the air pressure applied to the cylinder used to attach the cleaning member of the cleaning device to the electrode rolling roll into the force (pressure x cross-sectional area of ​​the inner diameter of the cylinder) attached to the rolling roll and dividing it by the unit length (length in contact with the rolling roll).

[0087] The amount of cleaning solution sprayed was measured by a flow sensor installed at the front end of the spray nozzle, and was measured using a propagation time difference method that transmits ultrasonic waves in an upward / downward direction with respect to the spray direction of the cleaning solution (160).

[0088] At this time, the measurement is performed at a temperature of -10 to 60 degrees Celsius without freezing and a humidity range of RH 35% to 85%.

[0089] The vibration resistance of the above flow sensor is 10 to 55 Hz, double amplitude 1.5 mm, 2 hours in each direction of x / y / z, and the shock resistance is 50 G, 3 times in each direction of x / y / z within 11 ms.

[0090] Attachment pressure (kg / cm) Detergent spray amount (ml) Conventional cleaning device 1.690.6 Cleaning device according to the present invention 1.940.06

[0091] Referring to Table 1 and Figures 4 and 5, it can be seen that, compared to a conventional cleaning device, in the case of the electrode rolling roll cleaning device according to the present invention, the adhesion area between the rolling roll and the cleaning cloth is smaller, so that the adhesion uniformity is improved, and the adhesion pressure is also improved. In addition, it can be seen that the amount of cleaning solution sprayed is reduced to about 1 / 10.

[0092]

[0093] <Comparative Example 1>

[0094] A conventional cleaning device (rolling roll full width attachment type, flat nozzle, single injection amount: 0.6 ml) was used, and oil was used as the cleaning liquid. HCr (hard chrome rolling roll) was used as the electrode rolling roll.

[0095]

[0096] <Comparative Example 2>

[0097] A cleaning device (narrow-width rolling roll attachment type, spray one-time fluid nozzle, single-spray amount: 0.06 ml) according to the present invention was used, but oil was used as the cleaning liquid. HCr (hard chrome rolling roll) was used as the electrode rolling roll.

[0098]

[0099] <Comparative Example 3>

[0100] A conventional cleaning device (rolling roll full width attachment type, flat nozzle, single injection amount: 0.6 ml) was used, and oil was used as the cleaning liquid. DLC (diamond like carbon) rolling rolls were used as the electrode rolling rolls.

[0101]

[0102] Comparative Example 4

[0103] A cleaning device (narrow-width rolling roll attachment type, spray one-time fluid nozzle, single-spray amount: 0.06 ml) according to the present invention was used, but oil was used as the cleaning liquid. A DLC (diamond-like carbon rolling roll) was used as the electrode rolling roll.

[0104]

[0105] <Example 1>

[0106] A cleaning device (narrow-width rolling roll attachment type, spray one-time fluid nozzle, single-injection amount: 0.06 ml) according to the present invention was used, and distilled water (DI water) was used as the cleaning liquid. HCr (hard chrome rolling roll) was used as the electrode rolling roll.

[0107]

[0108] <Example 2>

[0109] A cleaning device (narrow-width rolling roll attachment type, spray one-time fluid nozzle, single-injection amount: 0.06 ml) according to the present invention was used, and distilled water (DI water) was used as the cleaning liquid. A DLC (diamond-like carbon rolling roll) was used as the electrode rolling roll.

[0110]

[0111] <Example 3>

[0112] It was prepared in the same manner as Example 1, except that the single injection amount was adjusted to 0.08 ml.

[0113]

[0114] Comparative Example 5

[0115] It was prepared in the same manner as Example 1, except that the single injection amount was adjusted to 0.03 ml.

[0116]

[0117] Comparative Example 6

[0118] It was prepared in the same manner as Example 1, except that the single injection amount was adjusted to 0.25 ml.

[0119]

[0120] Experimental Example 2

[0121] The color difference values ​​before and after cleaning of the above electrode rolling roll were compared to confirm the cleaning effect, and the results are shown in Table 2 below.

[0122] Here, the color difference value was measured using a chromaticity colorimeter as L*: perceived brightness (black / white). In the case of the HCr rolling roll, the higher the color difference value, the cleaner the condition, and in the case of the DLC rolling roll, the lower the color difference value, the cleaner the condition.

[0123] Before cleaning After cleaning Example 185.4384.96 Example 28.578.69 Example 383.4784.27 Comparative Example 184.0366.41 Comparative Example 284.7370.19 Comparative Example 36.0819.27 Comparative Example 410.679.99 Comparative Example 584.2671.24 Comparative Example 684.9184.92

[0124] Referring to Table 2 above, regardless of the type of electrode rolling roll, in order to obtain an excellent cleaning effect, it is necessary to use distilled water as the cleaning liquid while using the cleaning device according to the present invention. However, as shown in Comparative Example 5, if the amount of distilled water sprayed is too small, the cleaning effect is reduced.

[0125]

[0126] Experimental Example 3

[0127] After cleaning the electrode rolling roll according to Example 1 and Comparative Example 6, the thickness of the electrode rolled by the electrode rolling roll was measured, and the results are shown in FIGS. 6 and 7 below.

[0128] The above thickness was measured using a thickness measuring device using a confocal sensor, and the method of measuring the thickness using a confocal sensor is that there is one displacement sensor each at the top and bottom, each sensor faces each other and has a unique focus, and the two sensors sharing the focus are measured against a reference film of known thickness (used as a scale for the confocal sensor), and the distance from each sensor to the reference film is calculated, and then the thickness is measured while moving the sensor in the direction of the electrode width.

[0129] For the above electrode, artificial graphite was used as a negative electrode active material, and a negative electrode slurry was prepared by mixing the negative electrode active material, conductive material (CNT), styrene-butadiene rubber (SBR) as a binder, and carboxymethyl cellulose (CMC) as an additive in a weight ratio of 98:0.5:1:0.5 in water, and then applying the slurry to a thickness of about 185 μm on an 8 μm thick Cu foil, drying it at 130°C, and rolling it to prepare a negative electrode for use.

[0130] In the case of Example 1, the thickness is not significantly different from that at the time of initial cathode manufacturing, but in the case of Comparative Example 6, cleaning was performed with a larger spray amount, and cleaning was performed well, but it can be seen that the distilled water that was not dried affected the electrode moisture content, resulting in electrode surface defects and thickness changes.

[0131]

[0132] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0133] [Explanation of symbols]

[0134] 10: Electrode rolling roll

[0135] 100: Electrode rolling roll cleaning device

[0136] 110: Absence of cleaning

[0137] 120: Cleaning cloth

[0138] 130: Injection nozzle

[0139] 140: Cleaning cloth supply section

[0140] 150: Washing cloth recovery unit

[0141] 160: Detergent

[0142] 170: Monitoring Department

[0143] 180: Control unit

[0144] 181: Flowmeter

[0145] According to the present invention, distilled water is used as a cleaning liquid when cleaning an electrode rolling roll, and when water is used as a solvent for the electrode, cleaning of the electrode rolling roll is easy.

[0146] In addition, by using a spray-type fluid nozzle and adjusting the spray amount of distilled water as the cleaning liquid to a very small amount, there is an effect of solving problems such as increased electrode thickness and moisture content, and desorption of active material that may occur when using distilled water as the cleaning liquid.

[0147] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Claims

1. As an electrode rolling roll cleaning device, A cleaning member provided so that the surface of the electrode rolling roll and the cleaning cloth can come into contact, A spray nozzle that sprays a cleaning solution onto the above cleaning cloth, A control unit for controlling the amount of spray of the above cleaning solution, and It includes a monitoring unit that monitors the amount of the cleaning solution sprayed, The above cleaning solution is distilled water, An electrode rolling roll cleaning device in which the above control unit adjusts the amount of cleaning liquid sprayed at one time by the spray nozzle to be in the range of 0.05 ml to 0.2 ml.

2. In paragraph 1, The above electrode rolling roll is an electrode rolling roll cleaning device including an upper rolling roll positioned above the electrode and a lower rolling roll positioned below the electrode.

3. In paragraph 1, The above electrode rolling roll is an electrode rolling roll cleaning device that is a hard chrome rolling roll or a DLC (diamond like carbon) rolling roll.

4. In paragraph 1, The above cleaning cloth is a non-woven electrode rolling roll cleaning device.

5. In paragraph 1, An electrode rolling roll cleaning device in which the cleaning member contacts the cleaning cloth at 20 to 60% of the total width length based on the width direction of the electrode rolling roll.

6. In paragraph 1, The above cleaning member is an electrode rolling roll cleaning device having an attachment pressure of 1.7 kg / cm to 2.0 kg / cm when attaching a cleaning cloth to the electrode rolling roll.

7. In paragraph 1, The above-mentioned injection nozzle is an electrode rolling roll cleaning device which is a spray type one-fluid nozzle.

8. In paragraph 1, An electrode rolling roll cleaning device in which the control unit adjusts the amount of cleaning liquid sprayed by the spray nozzle to a range of 0.05 ml to 0.1 ml.

9. In paragraph 11, An electrode rolling roll cleaning device, wherein the control unit includes a flow meter, and controls the amount of cleaning agent sprayed by the spray nozzle to increase the amount if the amount of cleaning agent is less than 0.05 ml, and to decrease the amount if the amount of cleaning agent exceeds 0.2 ml.

10. In paragraph 1, An electrode rolling roll cleaning device wherein the monitoring unit monitors the amount of cleaning liquid sprayed by the spray nozzle and transmits information to the control unit.

11. In paragraph 1, A cleaning cloth supply unit that supplies the cleaning cloth; and An electrode rolling roll cleaning device further comprising a cleaning cloth recovery unit for recovering the cleaning cloth.

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