Roundness measuring device of coating roll for battery manufacturing and roundness measuring method of the same

Abstract

The present invention relates to a lamination device for manufacturing an electrode cell assembly by laminating electrodes and separators released from an electrode roll and a separator roll, comprising: a lamination unit in which the electrode cell assembly is laminated and manufactured; an inspection unit that detects a defective electrode cell assembly by measuring the thickness of the manufactured electrode cell assembly; a discharge unit that separates and discharges the defective electrode cell assembly from a normal electrode cell assembly; and a control unit that calculates the time when the defective electrode cell assembly reaches the discharge unit based on distance data between the location where the defective electrode cell assembly is detected and the discharge unit, and controls the separation and discharge of the defective electrode cell assembly when it reaches the discharge unit. In addition, the present invention relates to a method for discharging a defective electrode cell assembly of the lamination device.

Description

Technology Field

[0001] The present invention relates to an apparatus and method for measuring the roundness of a coating roll for battery manufacturing. More specifically, the invention relates to an apparatus and method for measuring the roundness of a coating roll that can accurately measure the roundness of the coating roll by measuring the roundness of the coating roll in a non-contact manner and reducing measurement errors during measurement. Background Technology

[0003] As the price of energy sources rises due to the depletion of fossil fuels and concerns about environmental pollution intensify, the demand for eco-friendly alternative energy sources is becoming an indispensable factor for future life; in particular, with the technological development and increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly rising.

[0004] Generally, unlike primary batteries which cannot be recharged, secondary batteries refer to batteries that can be charged and discharged, and such secondary batteries are widely used in various fields such as mobile phones, laptops, and automobiles.

[0005] The electrodes of such secondary batteries are manufactured by coating an electrode slurry, which is a mixture of active material and conductive material, onto a metal substrate, heating and drying it, and then undergoing a rolling process.

[0006] Examples of the above coating processes include a slot die coating method in which an electrode slurry is discharged onto a metal substrate (current collector) using a slot die, and a roll coating method in which an electrode slurry is applied to a rotating roll and then transferred to a current collector as the rotating roll with the electrode slurry applied rotates.

[0007] Figure 1 is a diagram showing electrode slurry being coated by a slot die coating method.

[0008] As described, the slot die (10) is supported by a coating roll (20) (backup roll) and discharges an electrode slurry (1) from the lip (11) of the slot die (10) onto a metal substrate (2) that is continuously running, thereby coating the electrode slurry (1) onto the metal substrate (2).

[0009] Figure 2 is a diagram showing that the electrode slurry (1) is coated by a roll coating method.

[0010] In this method, a rotating roll (A) with electrode slurry (1) attached rotates, and as the metal substrate (2) moves in close contact with the rotating roll (A), the electrode slurry (1) attached to the rotating roll (A) is transferred to the metal substrate (2). In this method as well, similar to FIG. 1, the metal substrate (2) is supported by a coating roll (20) (backup roll).

[0011] As described above, regardless of the method, the metal substrate (current collector sheet) to which the electrode slurry is applied is supported by a coating roll and the electrode slurry is coated while moving continuously according to the rotation of the coating roll. Since the coating roll functions to support and guide the metal substrate at the same time, it is also referred to as a backup roll or a guide roll.

[0012] Meanwhile, when coating with electrode slurry, the amount of electrode slurry loaded in the width direction (TD direction) and travel direction (length direction: MD direction) of the metal substrate must be uniform to ensure excellent coating quality. Among these, there are various causes for loading deviation in the travel direction, but changes in the roundness of the coating roll are identified as the main cause. A change in the roundness of the coating roll means that the coating gap changes with periodicity.

[0013] Conventionally, to evaluate the roundness of such a coating roll, a physical contact method using a dial gauge (30) as shown in FIG. 3 was adopted. That is, the measuring element (31) of the dial gauge (30) was brought into contact with the surface of the coating roll, and the minute movement of the spindle was amplified by a gear mechanism to read the dimension indicated on the scale plate and compare the lengths to evaluate the roundness of the coating roll.

[0014] However, since this method involves direct contact between the coating roll and the dial gauge, there were the following problems.

[0015] First, because the method involves direct contact with the coating roll, it was necessary to stop the equipment line or measure at a low speed (2 m / min or less) to measure roundness; therefore, roundness could not be measured at the actual line operating speed.

[0016] Second, since it is a physical contact method, it has the limitation of being able to measure only the outer edges of the coating area where scratches do not matter, making it difficult to measure the roundness of the actual coating part, which is the most important aspect.

[0017] Third, measurement errors inevitably occurred depending on the skill level of the operator manipulating the dial gauge.

[0019] From the above, it is desired to develop a technology that can accurately measure the roundness of the coating roll at actual line operation speeds. Prior art literature

[0021] Republic of Korea Published Patent Application No. 10-2018-0114380 The problem to be solved

[0022] The present invention was created to solve the above-mentioned problems and aims to provide a roundness measuring device and method for a coating roll for battery manufacturing capable of measuring the roundness of the coating roll at an actual line operating speed.

[0023] In addition, the purpose is to provide a roundness measuring device and a measuring method for a coating roll for battery manufacturing, which can measure the coaxiality of a coating roll by measuring the roundness of multiple locations on the coating roll.

[0024] In addition, the purpose is to provide a roundness measuring device and method for a coating roll for battery manufacturing that can accurately measure the roundness of the actual coating portion where the coating is performed as well as the outer edge of the coating roll, without error caused by the measuring device. means of solving the problem

[0026] To solve the above problem, the roundness measuring device of the coating roll according to the present invention is a roundness measuring device of a coating roll that supports an electrode sheet when coating an electrode slurry onto an electrode sheet, and comprises: a displacement sensor that measures the roundness of the coating roll in a non-contact manner while spaced apart from the coating roll; and a support member on which the displacement sensor is installed and which extends along the longitudinal direction of the coating roll, wherein a plurality of displacement sensors are installed on the support member along the longitudinal direction of the coating roll.

[0027] As an example, the displacement sensor is installed on the back side of the electrode sheet coated with the electrode slurry.

[0028] Specifically, a total of three displacement sensors may be installed facing each other at the left, center, and right positions of the coating roll.

[0029] Preferably, the coaxiality of the coating roll can be measured by measuring the roundness of the three displacement sensors.

[0030] In addition, it is preferable that the displacement sensor be installed in a direction perpendicular to the center axis of the coating roll.

[0031] As an example, the support member may be coupled to a support frame installed adjacent to both ends of the coating roll.

[0032] As another example, the apparatus further includes a linear movement mechanism that moves the displacement sensor back and forth to enable access to and separation from the coating roll, and the linear movement mechanism may be mounted on the support member.

[0033] As an example, the linear movement mechanism is a microstage, and the displacement sensor can be mounted on the microstage and moved back and forth.

[0034] Specifically, the zero point of the displacement sensor can be adjusted by the forward and backward movement of the displacement sensor by the microstage.

[0035] In another embodiment, magnet members are installed at both ends of the support member, and the magnet members can be attached to a predetermined position of the support frame.

[0036] As another aspect of the present invention, a method for measuring the roundness of a coating roll for battery manufacturing is provided, comprising: a step of installing a plurality of displacement sensors spaced apart from the coating roll and along the longitudinal direction of the coating roll; a step of continuously measuring the outer diameter of the coating roll at a point opposite to the displacement sensors as the coating roll rotates; and a step of calculating the roundness of the coating roll by the continuous measurement of the outer diameter of the coating roll. Effects of the invention

[0038] According to the present invention, since the roundness of the coating roll is measured in a non-contact manner, the roundness of the coating roll corresponding to the actual coating part can be measured in real time in accordance with the operating speed of the equipment line.

[0039] In addition, multiple displacement sensors can measure not only the roundness but also the coaxiality of the coating roll.

[0040] In addition, the zero-point adjustment function by the micro-stage has the effect of accurately measuring the roundness and coaxiality of the coating roll without deviation between measurements. Brief explanation of the drawing

[0042] Figure 1 is a diagram showing electrode slurry being coated by a slot die coating method. Figure 2 is a diagram showing electrode slurry being coated by a roll coating method. Figure 3 is a schematic diagram showing a method for measuring the roundness of a coating roll using a conventional dial gauge. FIG. 4 is a front view showing a roundness measuring device for a coating roll for battery manufacturing according to one embodiment of the present invention. FIG. 5 is a perspective view and a side view of a micro stage, which is a component applied to the embodiment of FIG. 4. FIG. 6 is a side view of a roundness measuring device for a coating roll for battery manufacturing according to an embodiment of FIG. 4. FIG. 7 is a side view showing the operation of a microstage and the zero-point adjustment process of a displacement sensor according to the embodiment of FIG. 4. FIG. 8 is a side view showing the operation of a microstage and the zero-point adjustment process of a displacement sensor according to the embodiment of FIG. 4. FIG. 9 is a side view showing a roundness measuring device for a coating roll for battery manufacturing according to another embodiment of the present invention. Specific details for implementing the invention

[0043] The detailed configuration of the present invention will be described below with reference to the attached drawings and various embodiments. The embodiments described below are presented as examples to aid in understanding the present invention, and the attached drawings are not drawn to actual scale to aid in understanding the invention, and the dimensions of some components may be exaggerated.

[0044] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0046] The roundness measuring device of the coating roll of the present invention is a roundness measuring device of a coating roll that supports an electrode sheet when coating an electrode slurry onto an electrode sheet, and comprises: a displacement sensor that measures the roundness of the coating roll in a non-contact manner while spaced apart from the coating roll; and a support member on which the displacement sensor is installed and which extends along the longitudinal direction of the coating roll, wherein a plurality of displacement sensors are installed on the support member along the longitudinal direction of the coating roll.

[0047] One of the main features of the present invention is that, as a coating roll roundness measuring device, it eliminates a conventional contact-type dial gauge and employs a coating roll and a non-contact displacement sensor.

[0048] Displacement sensors applicable to the present invention may include eddy current displacement sensors, optical displacement sensors, ultrasonic displacement sensors, linear proximity sensors, magnetoresistive displacement sensors, etc. However, the invention is not limited to displacement sensors capable of measuring the outer diameter of a coating roll in a non-contact manner.

[0049] As an example of an optical displacement sensor, a laser displacement sensor may be used. The laser displacement sensor is equipped with a transmitter that emits a laser and a receiver that receives the reflected light. By the transmitter irradiating the laser onto the surface of the coating roll and receiving the reflected light while simultaneously measuring the angle of the reflected light with a camera, the distance (displacement) from the displacement sensor to the surface of the coating roll can be measured non-contactually.

[0050] As shown in FIGS. 1 and 2, the coating roll rotates to guide and support the metal substrate when the electrode slurry is coated onto the metal substrate; therefore, the displacement sensor can continuously measure the outer diameter or radius of the coating roll at a set measurement point during the rotation of the coating roll. The roundness of the coating roll can be determined from a series of outer diameter or radius values ​​at the measurement point measured when the coating roll rotates once. The outer diameter of the coating roll may change by several micrometers even during one rotation depending on changes in ambient temperature and changes in the temperature of the supplied electrode slurry. Therefore, the roundness of the coating roll can be calculated from the continuous values ​​of the outer diameter or radius measured by the displacement sensor when the coating roll rotates once. For example, when the coating roll rotates once, if the continuous displacement values ​​of the outer diameter or radius are measured by the displacement sensor using the measurement starting point as a reference point, the change in the outer diameter or radius can be represented numerically. If the change in the outer diameter or radius is within a set predetermined range, it can be determined that there is no significant problem with the roundness of the coating roll. However, if the change in the outer diameter or radius exceeds the set range, there is a problem with the roundness of the coating roll, and it can be expected that there is an abnormality in the quality of the electrode slurry coated based on such a coating roll. That is, according to the present invention, the quality of the electrode slurry coating process can be predicted by measuring the roundness of the coating roll.

[0051] The present invention also installed a plurality of displacement sensors on a support member extending along the longitudinal direction of the coating roll.

[0052] Coating rolls can be manufactured in various sizes and lengths depending on the type of electrode. Temperature uniformity along the longitudinal direction of such coating rolls determines the coating quality of the electrode slurry in the width direction. That is, even if the roundness at one point along the longitudinal direction of the coating roll is within a set range, if the roundness at another point deviates from the set range, the coating quality of the electrode slurry in the width direction may be compromised. Therefore, the present invention installs multiple displacement sensors along the longitudinal direction of the coating roll and measures the roundness at each point along the longitudinal direction of the coating roll to predict or manage the coating quality of the electrode slurry in the width direction. Furthermore, since the roundness of the coating roll is related to the coating quality in the direction of travel (MD direction) of the electrode slurry and the roundness along the longitudinal direction of the coating roll is related to the coating quality in the width direction (TD direction) of the electrode slurry, the present invention can predict the coating quality of the electrode slurry in the direction of travel and the width direction by installing multiple displacement sensors along the longitudinal direction of the coating roll.

[0053] In addition, the coaxiality of the coating roll can be determined by installing a total of three displacement sensors, one each at the left, center, and right positions along the longitudinal direction of the coating roll. That is, the three displacement sensors each measure the roundness of three points on the coating roll, and by substituting these roundness values ​​into a predetermined equation, the straightness or coaxiality (i.e., the degree to which the coating roll is positioned straight on the same axis without bending) of the coating roll can be calculated. In order to obtain the number of variable values ​​required for the equation for calculating the coaxiality, it is necessary to measure the roundness using at least three displacement sensors.

[0054] Meanwhile, the present invention includes a support member extending along the longitudinal direction of the coating roll to install the plurality of displacement sensors. The support member may be installed on the wall of a workroom where a separate coating roll is installed, or it may be installed on a dedicated support frame.

[0055] As described above, the present invention can predict the coating quality of the electrode slurry or whether abnormalities occur by measuring the roundness or coaxiality of the coating roll by installing a plurality of non-contact displacement sensors along the longitudinal direction of the coating roll.

[0056] In addition, coating quality can be improved by controlling the ambient temperature related to air conditioning or the temperature or loading amount of the electrode slurry through this data. Alternatively, the roundness or coaxiality of the coating roll can be improved by installing a heating unit on the coating roll to heat part or all of the coating roll. Furthermore, the replacement of the coating roll can be detected in advance through the roundness and coaxiality data.

[0057] According to the present invention, since the displacement sensor can precisely measure the roundness of the coating roll in a non-contact manner, the roundness of the central part of the coating roll where the electrode slurry is actually coated can also be directly measured, and the roundness can be measured without stopping the device at the actual operating speed of the coating device (e.g., 1.3 mm / sec). Therefore, according to the present invention, there is an advantage that the coating quality can be managed by matching it with equipment data in real time.

[0058] A specific embodiment of the roundness measuring device for a coating roll for battery manufacturing according to the present invention will be described in more detail below with reference to the attached drawings.

[0060] (First embodiment)

[0061] FIG. 4 is a front view showing a roundness measuring device (100) for manufacturing a battery coating roll according to one embodiment of the present invention, FIG. 5 is a perspective view and a side view of a micro stage (80) which is a component applied to the embodiment of FIG. 4, and FIG. 6 is a side view of a roundness measuring device (100) for manufacturing a battery coating roll according to the embodiment of FIG. 4.

[0062] In the embodiment of FIG. 4, a support member (60) is extended along the longitudinal direction of the coating roll (20), and this support member (60) is connected to a dedicated support frame (70) installed adjacent to both ends of the coating roll (20). Of course, the support member (60) may also be installed directly on the inner wall of the coating process room as long as the installation space allows. In this embodiment, as shown in FIG. 6, the support members (60) are installed in pairs parallel along the longitudinal direction of the coating roll (20) to stably support the displacement sensor (40).

[0063] A plurality of displacement sensors (40) are installed along the longitudinal direction of the coating roll (20) on the support member (60). In this embodiment, a total of three displacement sensors (40) are installed, one each at the left, center, and right positions of the coating roll (20). For example, if the coating roll (20) has a length of 1400 mm, a total of three displacement sensors (40) can be installed, one each at points 300 mm, 700 mm, and 1100 mm from the end of the coating roll. As described above, by measuring the roundness with the three displacement sensors (40), the coaxiality of the coating roll (20) can be obtained, and thereby the misalignment of the corresponding coating roll axis can be identified.

[0064] Of course, if necessary to obtain the coaxiality of the coating roll (20), three or more displacement sensors (40) can be installed on the support member. When measuring the roundness with more than three displacement sensors (40), a more precise coaxiality can be obtained.

[0065] The axis (21) of the coating roll (20) can be installed on the support frame (70), a separate support member, or the side wall of the coating process room.

[0066] In order to reduce the measurement error of the displacement sensor (40), as shown in FIGS. 4 and 6, the displacement sensor (40) is installed in a direction perpendicular to the center axis of the coating roll (20). In particular, as clearly shown in FIG. 6, it is desirable to make the height of the sensor and the center axis of the coating roll on the same line, that is, to make the angle between the displacement sensor (40) and the center axis of the coating roll 0 degrees.

[0067] Meanwhile, as shown in FIG. 6, the displacement sensor (40) is installed facing the coating roll (20) on the back side of the electrode sheet (2) where the electrode slurry (1) is coated. Although it is possible to install the displacement sensor (40) on the surface side of the electrode sheet (2), in this case, there may be limitations in accurately measuring the change in outer diameter caused by the shrinkage / expansion of the coating roll (20) due to the influence of the surface expansion of the electrode slurry. Therefore, as shown in FIG. 6, it is preferable to install the support member (60) and the displacement sensor (40) of the present invention on the back side of the electrode sheet (2).

[0068] The roundness measuring device (100) of the present embodiment is equipped with a linear movement mechanism that moves the displacement sensor (40) closer to or further away from the coating roll (20). That is, the linear movement mechanism is mounted on a support member (60), and the displacement sensor (40) is moved closer to and further away from the coating roll (20) by means of this linear movement mechanism.

[0069] Multiple displacement sensors (40) are installed along the longitudinal direction of the coating roll (20), and when an operator (measurement operator) needs to adjust these multiple displacement sensors (40), a linear movement mechanism is required to move the displacement sensors to the coating roll (20). In particular, it is necessary to reduce measurement errors between operators by adjusting the distance between the displacement sensors and the coating roll to within a predetermined range.

[0070] FIGS. 4 to 6 illustrate a micro stage (80) as an example of such a linear movement mechanism. In FIG. 4, the micro stage (80) is mounted on the support member (60) via a bracket (50), and the displacement sensor (40) is mounted on the micro stage (80).

[0071] FIG. 5 shows a perspective view (Fig. 5(a)) and a side view (Fig. 5(b)) of a micro stage (80). The micro stage (80) is a linear movement mechanism capable of moving an extremely small distance, and in this embodiment, it has a forward and backward movement stroke of, for example, ±6.5 mm.

[0072] Specifically, the micro stage (80) comprises an upper stage (81) and a lower stage (82), and the lower stage (82) is coupled to a fixed plate (85). The lower stage (82) and the fixed plate (85) are fixedly coupled to a bracket (50) installed on a support member (60).

[0073] The upper stage (81) is connected to the cylinder member (84) and can move back and forth by a predetermined stroke according to the forward and backward movement of the cylinder member (84). The cylinder member (84) is connected to the driving unit (83) and can move back and forth according to the operation of the driving unit. The cylinder member (84) may have a built-in mechanical converter mechanism that converts rotational motion into linear motion, for example, by a ball screw-ball nut combination. Thus, the rotational motion of the motor, which is the driving unit (83), can be transmitted and converted into linear motion of the cylinder member (84). Alternatively, other converter mechanisms may be employed in the micro stage (80), and a detailed description thereof is omitted. In some cases, a rotary lever may be employed as the driving unit (83) instead of a motor, and the cylinder member (84) can be moved back and forth by rotating the rotary lever. The micro stage (80) is configured to precisely control the forward and backward movement of the cylinder member (84) when rotational motion of a certain angle is transmitted by the driving unit (83). Therefore, the cylinder member (84) can be moved by a very small amount of stroke (e.g., in the order of a few millimeters) that is difficult for a person to control. With this micro-stage (80), zeroing of the displacement sensor (40) is possible.

[0074] FIGS. 7 and FIGS. 8 are side views showing the operation of the microstage and the zero-point adjustment process of the displacement sensor (40) according to the embodiment of FIG. 4.

[0075] In the state of FIG. 6, the driving unit (83) is driven to move the cylinder member (84) so ​​that the upper stage (81) of the micro stage (80) moves closer to the displacement sensor (40). For convenience of explanation, the movement stroke of the micro stage (80) and the displacement sensor (40) is exaggerated in the drawing, but in reality, the stroke is very small in the order of a few millimeters. As a result, the displacement sensor (40) approaches the coating roll (20) more closely as shown in FIG. 7.

[0076] Additionally, when the driving unit (83) is driven in the state of FIG. 6 to move the cylinder member (84) so ​​that the upper stage (81) of the micro stage (80) moves away from the displacement sensor (40), the state of FIG. 8 is obtained. As shown in FIG. 7 and FIG. 8, the micro stage (80) can be operated to move the displacement sensor (40) back and forth to the coating roll (20), thereby bringing the distance between the displacement sensor and the coating roll within a set distance range. That is, the zero point of the displacement sensor (40) can be adjusted by operating the micro stage (80). For example, when the distance between the displacement sensor (40) and the coating roll (20) is within the set range, a lamp (not shown) installed on the displacement sensor (40) is turned on, thereby confirming that the zero point of the displacement sensor (40) has been adjusted. This set range becomes the measurement reference position of the displacement sensor, and measuring the roundness of the coating roll at this reference position can reduce the roundness measurement error caused by the operator (measurement person). That is, regardless of which operator measures, if the zero point of the displacement sensor is adjusted by the forward and backward movement of the displacement sensor (40) by the micro stage (80), the measurement error of the roundness or coaxiality depending on the operator can be minimized.

[0078] (Second embodiment)

[0079] FIG. 9 is a side view showing a roundness measuring device (200) for a coating roll for battery manufacturing according to another embodiment of the present invention.

[0080] Identical parts in this embodiment and the first embodiment are given the same reference numerals, and a detailed description thereof is omitted.

[0081] The second embodiment differs from the first embodiment in that a predetermined magnet member (61) is installed at both ends of a support member (60) that supports a displacement sensor (40).

[0082] Depending on the specifications or type of the coating device, the support member (60) and the displacement sensor (40) may need to be installed in a different coating device. Alternatively, even with the same coating device, if the coating roll is replaced, it may be necessary to change the installation position of the displacement sensor (40). In this case, if magnet members (61) are installed at both ends of the support member (60) and the magnet members (61) are attached to the support frame (70), the displacement sensor (40) can be conveniently attached and detached.

[0083] In particular, if the magnet member (61) is attached to a predetermined position on the support frame (70), the measurement position of the displacement sensor (40) is standardized, and the measurement error depending on the person measuring can be reduced.

[0084] Accordingly, according to the present embodiment, not only can the displacement sensor (40) and the support member (60) be easily attached and detached, but the measurement error according to the measurer can also be further minimized by being organically combined with the zero point adjustment function by the micro stage (80).

[0086] A method for measuring roundness using a roundness measuring device (100, 200) for a coating roll for battery manufacturing according to the present invention will be explained in detail again.

[0087] First, a plurality of displacement sensors (40) are installed along the longitudinal direction of the coating roll (20) at a distance from the coating roll (20). At this time, it is preferable to install the displacement sensors (40) on the back side of the electrode sheet (2) on which the electrode slurry is coated. Additionally, the displacement sensors (40) can be installed in a direction perpendicular to the central axis of the coating roll (20) to reduce measurement errors.

[0088] After installing the displacement sensor (40), the outer diameter of the coating roll at a point opposite the displacement sensor is continuously measured as the coating roll (20) rotates.

[0089] The change in the outer diameter of the coating roll during one rotation, i.e., the roundness, is calculated by continuously measuring the outer diameter of the coating roll.

[0090] At least three displacement sensors (40) are installed, one each on the left, center, and right sides of the coating roll (20), and the roundness of the coating roll (20) is measured with each displacement sensor (40). By substituting the roundness value into a predetermined equation, the degree of misalignment of the coating roll axis, i.e., the degree of coaxiality, can be measured.

[0091] In addition, by installing the displacement sensor (40) so that it can approach and move away from the coating roll (20), the roundness of the coating roll can be accurately measured in response to changes in the specifications or type of the coating roll.

[0092] In particular, by mounting the displacement sensor (40) on the micro stage (80) and moving the displacement sensor back and forth on the micro stage (80), the zero point of the displacement sensor (40) can be precisely adjusted, thereby minimizing the measurement error of roundness / coaxiality depending on the measurer.

[0094] As described above, according to the present invention, by measuring the roundness or coaxiality of a coating roll in a non-contact manner, the coating quality of the electrode slurry or whether abnormalities occur can be predicted. Furthermore, the roundness of not only the peripheral part of the coating roll but also the central part of the coating roll where the electrode slurry is actually coated can be measured in accordance with the line operating speed of the actual coating device. Therefore, in-line measurement is possible in conjunction with the control of the coating device, and roundness data can be provided to the control unit in real time to contribute to the improvement of coating quality.

[0095] In addition, by obtaining real-time data on roundness / coaxiality, it is possible to analyze the correlation with equipment data such as slurry loading amount, slurry temperature, and air conditioning temperature, and thereby improve loading / coating process capabilities.

[0097] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Explanation of the symbols

[0099] 1: Electrode slurry 2: Metal substrate 10: Slot Die 11: Lip A: Rotating roll 20: Coating Roll 21: Coating Roll Axis 30: Dial gauge 31: Measurer 40: Displacement sensor 50: Bracket 60: Support member 70: Support Frame 80: Linear movement mechanism (micro stage) 81: Upper stage 82: Lower stage 83: Drive unit 84: Cylinder member 85: Fixing plate 100, 200: Roundness measuring device for coating rolls used in battery manufacturing

Claims

Claim 1 A device for measuring the roundness of a coating roll for battery manufacturing, comprising: a displacement sensor that measures the roundness of the coating roll in a non-contact manner while spaced apart from the coating roll; a support member on which the displacement sensor is installed and which extends along the longitudinal direction of the coating roll; and a linear movement mechanism that moves the displacement sensor back and forth to enable approach to and separation from the coating roll, wherein the linear movement mechanism is mounted on the support member, and the displacement sensor is installed in multiple numbers on the support member along the longitudinal direction of the coating roll. Claim 2 In claim 1, the displacement sensor is a roundness measuring device for a coating roll for battery manufacturing, installed on the back side of an electrode sheet coated with an electrode slurry. Claim 3 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 1, the displacement sensors are installed in a total of three locations facing each other at the left, center, and right positions of the coating roll. Claim 4 A roundness measuring device for a coating roll for battery manufacturing, wherein, in paragraph 2, the coaxiality of the coating roll is measured by the roundness measurement of the displacement sensor. Claim 5 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 1, the displacement sensor is installed in a direction perpendicular to the center axis of the coating roll. Claim 6 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 1, the support member is coupled to a support frame installed adjacent to both ends of the coating roll. Claim 7 delete Claim 8 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 1, the linear movement mechanism is a micro stage and the displacement sensor is mounted on the micro stage and moves back and forth. Claim 9 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 8, the zero point of the displacement sensor is adjusted by the forward and backward movement of the displacement sensor by the micro stage. Claim 10 A roundness measuring device for a coating roll for battery manufacturing, wherein, in claim 6, magnet members are installed at both ends of the support member, and the magnet members are attached at a predetermined position of the support frame. Claim 11 A method for measuring the roundness of a coating roll for battery manufacturing, comprising: a step of installing a plurality of displacement sensors spaced apart from the coating roll and along the longitudinal direction of the coating roll; a step of continuously measuring the outer diameter of the coating roll at a point opposite to the displacement sensors as the coating roll rotates; and a step of calculating the roundness of the coating roll by the continuous measurement of the outer diameter of the coating roll, wherein the roundness of the coating roll is measured by a displacement sensor installed to enable approach to and separation from the coating roll. Claim 12 A method for measuring the roundness of a coating roll for battery manufacturing according to claim 11, wherein a total of three displacement sensors are installed facing each other at the left, center, and right positions of the coating roll, respectively, and the coaxiality of the coating roll is measured by measuring the roundness of the three displacement sensors. Claim 13 A method for measuring the roundness of a coating roll for battery manufacturing, wherein, in claim 11, the displacement sensor is installed in a direction perpendicular to the center axis of the coating roll to measure the roundness of the coating roll. Claim 14 delete Claim 15 A method for measuring the roundness of a coating roll for battery manufacturing, wherein, in claim 11, the displacement sensor is mounted on a microstage and can move back and forth by the operation of the microstage, and the zero point of the displacement sensor is adjusted by the back and forth movement of the displacement sensor by the microstage.

Images