Roundness measuring device and measuring method for coating roll used in battery manufacturing

Abstract

Disclosed herein is a roundness measuring device and a roundness measuring method for a coating roll used in battery manufacturing. The roundness measuring device for a coating roll that supports an electrode sheet when the electrode sheet is coated with an electrode slurry includes a displacement sensor spaced apart from the coating roll and configured to measure the roundness of the coating roll in a non-contact manner, and a support member on which the displacement sensor is mounted, and the support member extends in a length direction of the coating roll, wherein the displacement sensor is mounted on the support member as a plurality of displacement sensors in the length direction of the coating roll.

Description

Technical Field

[0001] This invention relates to a roundness measuring device and a roundness measuring method for coating rollers used in battery manufacturing. More specifically, this invention relates to a roundness measuring device and a roundness measuring method that can accurately measure the roundness of a coating roller by measuring its roundness in a non-contact manner, while reducing measurement errors during the measurement process.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0004364, filed on January 13, 2021, the entire contents of which are incorporated in the document as part of this specification. Background Technology

[0003] With rising energy prices due to the depletion of fossil fuels and increasing concerns about environmental pollution, the demand for environmentally friendly alternative energy sources has become an indispensable factor in future life. In particular, with technological advancements and the increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly increasing.

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

[0005] The electrodes of such secondary batteries are manufactured by coating a metal substrate (in which active and conductive materials are mixed) with an electrode slurry, heating and drying the resulting material, and then performing a rolling process.

[0006] The coating process includes slit coating and roll coating. In slit coating, an electrode paste is dispensed onto a metal substrate (current collector) using a slit die. In roll coating, the electrode paste is applied to a rotating roll, which then rotates to transfer the electrode paste to the current collector.

[0007] Figure 1 This diagram illustrates the application of electrode slurry using a slit die coating method.

[0008] As shown in the figure, the slit die 10 is supported by the coating roller 20 (support roller), and the electrode paste 1 is discharged from the lip 11 of the slit die 10 relative to the continuously traveling metal substrate 2 to coat the metal substrate 2 with the electrode paste 1.

[0009] Figure 2 This diagram illustrates the application of electrode paste 1 using a roller coating method.

[0010] In the roll coating method, the rotating roller A to which the electrode paste 1 is applied rotates, and the metal substrate 2 moves in close contact with the rotating roller A, thus transferring the electrode paste 1 applied to the rotating roller A onto the metal substrate 2. Like Figure 1 In this way, even in the roll coating method, the metal substrate 2 is supported by the coating roller 20 (support roller).

[0011] As described above, the metal substrate (current collector) to which the electrode paste is applied is supported by a coating roller, which moves continuously as the coating roller rotates and is coated with the electrode paste. Because the coating roller supports the metal substrate and also guides the metal substrate, the coating roller is called a support roller or guide roller.

[0012] Simultaneously, during electrode paste coating, the amount of electrode paste loaded in both the width direction (TD direction) and the travel direction (length direction: MD direction) of the metal substrate should be uniform to obtain excellent coating quality. While there are several reasons for loading deviations in the travel direction, the variation in the roundness of the coating roller is the primary cause. Variations in the roundness of the coating roller imply periodic changes in the coating gap.

[0013] According to relevant technologies, such as Figure 3 As shown, a physical contact method via a dial gauge is used to evaluate the roundness of the coating roller. That is, the roundness of the coating roller is evaluated by bringing the measuring pointer 31 of the dial gauge 30 into contact with the surface of the coating roller, amplifying the minute movement of the spindle using a gear mechanism, reading the dimension indicated on the scale, and comparing the lengths.

[0014] However, since this measurement method involves direct contact between the coating roller and the dial indicator, the following problems exist.

[0015] First, because the dial indicator is in direct contact with the coating roller, it is impossible to measure roundness at the actual production line operating speed, since the production line must be stopped inevitably to measure roundness, or roundness must be measured at low speeds (2m / min or lower).

[0016] Second, since this measurement method is a physical contact method, its limitation is that it only measures the outer periphery of the coating area, which is insignificant even if scratches occur, and it is difficult to measure the roundness of the important actual coating parts.

[0017] Third, measurement errors are inevitable depending on the skill level of the person operating the dial indicator.

[0018] Therefore, it is desirable to develop a technology that can accurately measure the roundness of coating rollers at actual production line operating speeds.

[0019] [Related Technical Documents]

[0020] [Patent Literature]

[0021] Korean Patent Publication No. 10-2018-0114380 Summary of the Invention

[0022] Technical issues

[0023] One object of the present invention is to provide a roundness measuring device and a roundness measuring method for coating rollers used in battery manufacturing, which can measure the roundness of coating rollers at actual production line operating speeds.

[0024] Another object of the present invention is to provide a roundness measuring device and a roundness measuring method for a coating roller used in battery manufacturing, which can measure the coaxiality of the coating roller by measuring the roundness of the coating roller at multiple points.

[0025] Another object of the present invention is to provide a roundness measuring device and a roundness measuring method for a coating roller used in battery manufacturing, which can accurately measure the roundness of the outer periphery of the coating roller and the roundness of the actual coating portion without errors caused by the measuring personnel, in which actual coating is performed.

[0026] Technical solution

[0027] To achieve the above objectives, the present invention provides a roundness measuring device for a coating roller, the coating roller supporting an electrode sheet when the electrode sheet is coated with an electrode slurry. The roundness measuring device includes a displacement sensor and a support member. The displacement sensor is spaced apart from the coating roller and configured to measure the roundness of the coating roller in a non-contact manner. The displacement sensor is mounted on the support member, and the support member extends along the length direction of the coating roller. The displacement sensor is mounted on the support member as a plurality of displacement sensors along the length direction of the coating roller.

[0028] The displacement sensor can be installed on the other side of the electrode sheet coated with electrode paste.

[0029] The displacement sensors can be installed as a total of three displacement sensors, facing the left, center, and right sides of the coating roller.

[0030] The coaxiality of the coating roller can be measured by using roundness measurement with three displacement sensors.

[0031] The displacement sensor can be installed in a direction perpendicular to the central axis of the coating roller.

[0032] The support members can be coupled to the support frame, which is installed adjacent to both ends of the coating roller.

[0033] The roundness measuring device may further include a linear movement mechanism configured to move the displacement sensor forward and backward to allow the displacement sensor to approach and separate from the coating roller, and the linear movement mechanism may be mounted on a support member.

[0034] The linear motion mechanism may include a miniature stage, and a displacement sensor may be mounted on the miniature stage to move forward and backward.

[0035] The zero point of the displacement sensor can be adjusted by moving the displacement sensor forward and backward using a miniature stage.

[0036] The magnet components can be installed at both ends of the support components, and the magnet components can be attached to predetermined positions on the support frame.

[0037] On the other hand, the present invention provides a method for measuring the roundness of a coating roller for battery manufacturing, comprising: installing a plurality of displacement sensors in the length direction of the coating roller, the displacement sensors being spaced apart from the coating roller; continuously measuring the outer diameter of the coating roller at a position facing the displacement sensors as the coating roller rotates; and calculating the roundness of the coating roller by continuously measuring the outer diameter of the coating roller.

[0038] Beneficial effects

[0039] According to the present invention, since the roundness of the coating roller is measured in a non-contact manner, the roundness of the coating roller corresponding to the actual coating section can be measured in real time according to the operating speed of the equipment production line.

[0040] In addition, it can not only measure the roundness of the coating roller, but also use multiple displacement sensors to measure coaxiality.

[0041] In addition, thanks to the zero-point adjustment function enabled by the miniature stage, the roundness and coaxiality of the coating roller can be accurately measured without deviation between measuring personnel. Attached Figure Description

[0042] Figure 1 This diagram illustrates the application of electrode slurry using a slit die coating method.

[0043] Figure 2 This diagram illustrates the application of electrode slurry using a roller coating method.

[0044] Figure 3 This is a schematic diagram illustrating a method for measuring the roundness of coating rollers using a traditional dashboard indicator.

[0045] Figure 4This is a front view illustrating a roundness measuring device for a coating roller used in battery manufacturing according to an embodiment of the present invention.

[0046] Figure 5 Shown as applied to Figure 4 A perspective view and a side view of the miniature stage of the components of the embodiment.

[0047] Figure 6 The diagram is based on Figure 4 A side view of a roundness measuring device for a coating roller used in battery manufacturing, according to an embodiment.

[0048] Figure 7 The diagram is based on Figure 4 A side view of the operation of the miniature stage and the zero-point adjustment process of the displacement sensor in the implementation method.

[0049] Figure 8 It is a diagram. Figure 4 A side view of the operation of the miniature stage and the zero-point adjustment process of the displacement sensor in the implementation method.

[0050] Figure 9 This is a front view illustrating a roundness measuring device for a coating roller used in battery manufacturing according to another embodiment of the present invention. Detailed Implementation

[0051] The detailed configuration of the invention will be described in detail below with reference to the accompanying drawings and various embodiments. The embodiments described below are illustrated illustratively to aid in understanding the invention; the drawings are not drawn to scale to aid in understanding the invention, and the dimensions of some components may be exaggerated.

[0052] This invention can be modified in various forms and can have various embodiments; therefore, specific embodiments will be illustrated in the accompanying drawings and described in detail in the following description. Therefore, the embodiments disclosed below should not be construed as limiting the invention to the specific embodiments, but should be understood as including modifications, equivalents, or substitutions within the spirit and technical scope of the invention.

[0053] The roundness measuring device for a coating roller of the present invention includes a displacement sensor and a support member. The coating roller supports the electrode sheet when the electrode sheet is coated with electrode slurry. The displacement sensor is spaced apart from the coating roller and configured to measure the roundness of the coating roller in a non-contact manner. The displacement sensor is mounted in the support member, and the support member extends along the length direction of the coating roller. Multiple displacement sensors are mounted in the support member along the length direction of the coating roller.

[0054] One of the main features of this invention is that, as a roundness measuring device for coating rollers, it does not include a conventional contact-type dial indicator, but instead employs a displacement sensor that does not contact the coating rollers.

[0055] As a displacement sensor suitable for this invention, eddy current displacement sensors, optical displacement sensors, ultrasonic displacement sensors, linear proximity sensors, magnetoresistive displacement sensors, or the like can be used. However, the invention is not limited to these, and any displacement sensor can be used, as long as it can measure the outer diameter of the coating roller in a non-contact manner.

[0056] As an example of an optical displacement sensor, a laser displacement sensor can be used. A laser displacement sensor includes a light projector for emitting a laser beam and a light receiver for receiving the reflected light. The light projector emits the laser beam onto the surface of the coating roller, the light receiver receives the reflected light, and a camera is used simultaneously to measure the angle of the reflected light, thus allowing for non-contact measurement of the distance (displacement) from the displacement sensor to the surface of the coating roller.

[0057] like Figure 1 and Figure 2 As shown, when coating a metal substrate with electrode paste, the coating roller rotates to guide and support the metal substrate. A displacement sensor can continuously measure the outer diameter or radius of the coating roller at a set measurement point as the roller rotates. The roundness of the coating roller can be determined by a series of outer diameter or radius values ​​measured at the measurement point during one rotation of the coating roller. Even when the coating roller rotates once, the outer diameter of the coating roller may vary by several micrometers depending on changes in ambient temperature and the temperature of the supplied electrode paste. Accordingly, the roundness of the coating roller can be calculated from the continuous values ​​of the outer diameter or radius measured by the displacement sensor during one rotation. For example, when the coating roller rotates once and the displacement sensor measures the continuous displacement values ​​of the outer diameter or radius based on the measurement starting point as a reference point, the change in the outer diameter or radius can be expressed as a numerical value. When the change in the outer diameter or radius is within a predetermined range, it can be determined that the roundness of the corresponding coating roller is not significantly affected. However, when the variation in outer diameter or radius exceeds a predetermined range, problems arise with the roundness of the coating roller, and abnormalities in the quality of the electrode paste coated on the coating roller can be expected. In other words, according to the present invention, the quality of the electrode paste coating process can be predicted by measuring the roundness of the coating roller.

[0058] According to the present invention, displacement sensors are installed as multiple displacement sensors in a support member extending along the length direction of the coating roller.

[0059] Depending on the type of electrode, coating rollers can be manufactured in various sizes and lengths. The coating quality of the electrode slurry in the width direction is determined by the temperature uniformity along the length of the coating roller. That is, even if the roundness at any point along the length of the coating roller is within a predetermined range, and the roundness at another point is outside the predetermined range, the coating quality of the electrode slurry in the width direction may be compromised. Therefore, according to the present invention, by mounting multiple displacement sensors along the length of the coating roller and measuring the roundness at each point along the length of the coating roller, the coating quality of the electrode slurry in the width direction can be predicted or managed. Furthermore, the roundness of the coating roller is related to the coating quality of the electrode slurry in the direction of travel (MD direction), and the roundness of the coating roller in the length direction is related to the coating quality of the electrode slurry in the width direction (TD direction). Therefore, according to the present invention, the displacement sensors are mounted as multiple displacement sensors disposed along the length of the coating roller, making it possible to predict the coating quality of the electrode slurry in both the direction of travel and the width direction.

[0060] Furthermore, the coaxiality of the coating roller can be determined by installing a total of three displacement sensors at positions on the left, center, and right sides along its length. That is, when the three displacement sensors measure the roundness of three points on the coating roller, and when these roundness values ​​are substituted into a predetermined equation, the straightness or coaxiality of the coating roller (i.e., the degree to which the coating roller is not bent and is straight on the same axis) can be calculated. To obtain the number of variable values ​​required for the equation used to calculate coaxiality, at least three displacement sensors are needed to measure roundness.

[0061] Furthermore, according to the present invention, a support member extending along the length direction of the coating roller is included for mounting multiple displacement sensors. The support member can be mounted on the wall of the chamber where the coating roller is mounted, or it can be mounted in a dedicated support frame.

[0062] As described above, according to the present invention, a plurality of non-contact displacement sensors are mounted along the length of the coating roller, and thus the roundness or coaxiality of the coating roller can be measured to predict the occurrence of coating quality or electrode slurry abnormalities.

[0063] Furthermore, coating quality can be improved by controlling the ambient temperature or electrode slurry temperature or loading amount related to air conditioning through segmented control of roundness or coaxiality data. Alternatively, a heating unit can be installed in the coating roller to heat part or the entire coating roller to improve the roundness or coaxiality of the coating roller. In addition, the replacement time of the coating roller can be detected in advance through roundness and coaxiality data.

[0064] According to the present invention, since the displacement sensor can accurately measure the roundness of the coating roller in a non-contact manner, it can directly measure the roundness of the center portion of the coating roller actually coated with electrode paste, and can measure the roundness without stopping the coating device at the actual operating speed of the coating device (e.g., 1.3 mm / s). Therefore, according to the present invention, there is an advantage that coating quality can be managed by matching equipment data in real time.

[0065] The specific embodiments of the roundness measuring device for coating rollers used in battery manufacturing according to the present invention will now be described in more detail with reference to the accompanying drawings.

[0066] [Method of Invention]

[0067] (First Implementation)

[0068] Figure 4 This is a front view of a roundness measuring device 100 for coating rollers used in battery manufacturing, according to an embodiment of the present invention. Figure 5 A perspective view and a side view of a miniature stage 80 are shown, which is used in... Figure 4 The components of the implementation method, and Figure 6 The diagram is based on Figure 4 A side view of the roundness measuring device 100 for coating rollers used in battery manufacturing, according to an embodiment.

[0069] exist Figure 4 In one embodiment, the support member 60 is mounted to extend along the length of the coating roller 20, and the support member 60 is coupled to a dedicated support frame 70, which is mounted adjacent to both ends of the coating roller. Alternatively, provided that installation space permits, the support member 60 can be directly mounted on the inner wall of the coating process chamber. Figure 6 As shown, in this embodiment, a pair of support members 60 are mounted parallel to each other along the length of the coating roller 20 to stably support the displacement sensor 40.

[0070] Displacement sensors 40 are mounted on the support member 60 along the length of the coating roller 20. In this embodiment, a total of three displacement sensors 40 are mounted at positions on the left, center, and right sides of the coating roller 20. For example, when the length of the coating roller 20 is 1400 mm, a total of three displacement sensors 40 can be mounted at positions 300 mm, 700 mm, and 1100 mm from the end of the coating roller. As described above, when the roundness is measured using the three displacement sensors 40, the coaxiality of the coating roller 20 can be obtained, and thus the deformation of the coating roller shaft can be determined.

[0071] Alternatively, to obtain the coaxiality of the coating roller 20, three or more displacement sensors 40 can be installed on the support member as needed. When more than three displacement sensors 40 are used to measure roundness, a more accurate coaxiality can be obtained.

[0072] The shaft 21 of the coating roller 20 can be mounted on the support frame 70, a separate support member, or the side wall of the coating process chamber.

[0073] like Figure 4 and Figure 6 As shown, to reduce the measurement error of the displacement sensor 40, the displacement sensor 40 is mounted in a direction perpendicular to the central axis of the coating roller 20. Specifically, as... Figure 6 As shown, the height of the sensor and the height of the central axis of the coating roller can be set collinearly, that is, the angle between the displacement sensor 40 and the central axis of the coating roller can be set to 0 degrees.

[0074] At the same time, such as Figure 6 As shown, the displacement sensor 40 is mounted on the back side of the electrode sheet 2 coated with electrode paste 1, facing the coating roller 20. Alternatively, the displacement sensor 40 can be mounted on the surface of the electrode sheet 2. In this case, the contraction / expansion of the coating roller 20 due to the surface expansion of the electrode paste may limit the accuracy of measuring changes in the outer diameter. Accordingly, as... Figure 6 As shown, the support member 60 and displacement sensor 40 of the present invention can be mounted on the back side of the electrode plate 2.

[0075] The roundness measuring device 100 of this embodiment is provided with a linear movement mechanism, which is configured to move the displacement sensor 40 toward or away from the coating roller 20. That is, the linear movement mechanism is mounted on the support member 60, and the displacement sensor 40 moves toward or away from the coating roller 20 via the linear movement mechanism.

[0076] Displacement sensors 40 are mounted as a plurality of displacement sensors 40 along the length of the coating roller 20. When the operator (measuring personnel) needs to adjust the plurality of displacement sensors 40, a linear movement mechanism is required to move the displacement sensors toward the coating roller 20. In particular, it is necessary to reduce measurement errors between operators by adjusting the distance between the displacement sensors and the coating roller within a predetermined range.

[0077] Figures 4 to 6 The illustration shows a miniature stage 80 as an example of such a linear motion mechanism. Figure 4 In the process, the miniature stage 80 is mounted on the support member 60 via the bracket 50, and the displacement sensor 40 is mounted on the miniature stage 80.

[0078] Figure 5 A perspective view of the miniature stage 80 is shown. Figure 5 A) and side view ( Figure 5 B). The miniature stage 80 is a linear movement mechanism capable of moving the displacement sensor 40 by an extremely small distance, and in this embodiment, the miniature stage 80 has a forward and backward travel of, for example, ±6.5 mm.

[0079] Specifically, the miniature stage 80 includes an upper stage 81 and a lower stage 82, with the lower stage 82 coupled to a fixed plate 85. The lower stage 82 and the fixed plate 85 are fixedly coupled to a bracket 50, which is mounted on a support member 60.

[0080] The upper stage 81 is connected to the cylinder member 84 and is capable of moving forward and backward by a predetermined stroke according to the forward and backward movement of the cylinder member 84. The cylinder member 84 is connected to the actuator 83 and is capable of moving forward and backward according to the operation of the actuator. The cylinder member 84 may have a built-in mechanical conversion mechanism for converting rotary movement into linear movement via, for example, a ball screw-ball nut coupling. Accordingly, the rotary movement of the electric motor, which serves as the actuator 83, can be transmitted and converted into linear movement of the cylinder member 84. Alternatively, other conversion mechanisms may be employed in the miniature stage 80 in addition to the mechanical conversion mechanism; detailed descriptions of these other conversion mechanisms will be omitted herein. In some cases, a rotary lever is used instead of an electric motor as the actuator 83, so that the cylinder member 84 can be moved forward and backward by rotating the rotary lever. When a certain angle of rotary movement is transmitted through the actuator 83, the miniature stage 80 is configured to precisely control the forward and backward movement of the cylinder member 84. Accordingly, the cylinder component 84 can be moved by a very small amount of stroke (e.g., a few millimeters) that is difficult for a human to control. Due to the miniature stage 80, the zero point of the displacement sensor 40 can be adjusted.

[0081] Figure 7 and Figure 8 The diagram is based on Figure 4 A side view of the operation of the miniature stage and the zero-point adjustment process of the displacement sensor 40 in the embodiment of the present invention.

[0082] exist Figure 6 In this state, the actuator 83 is driven, thus moving the cylinder component 84, causing the upper stage 81 of the miniature stage 80 to approach the displacement sensor 40. For ease of description, although the travel distance of the miniature stage 80 and the displacement sensor 40 due to the miniature stage 80 is exaggerated in the figures, this travel distance is actually very small (in millimeters). Accordingly, as Figure 7 As shown, the displacement sensor 40 is closer to the coating roller 20.

[0083] In addition, Figure 6 In the state where the actuator 83 is driven, the cylinder component 84 moves, causing the upper stage 81 of the miniature stage 80 to move 40 away from the displacement sensor, the miniature stage 80 becomes Figure 8 The state. For example, in Figure 7 and Figure 8 As is the case here, while the miniature stage 80 is driven and the displacement sensor 40 moves forward and backward relative to the coating roller 20, the distance between the displacement sensor and the coating roller can be within a predetermined range. That is, the zero point of the displacement sensor 40 can be adjusted by operating the miniature stage 80. For example, when the distance between the displacement sensor 40 and the coating roller 20 is within the predetermined range, a lamp (not shown) installed in the displacement sensor 40 is turned on, thus confirming that the zero point of the displacement sensor 40 has been adjusted. This predetermined range becomes the measurement reference position for the displacement sensor, and when the roundness of the coating roller is measured at this reference position, roundness measurement errors caused by the operator (measuring personnel) can be reduced. In other words, even when any operator performs the measurement, when the zero point of the displacement sensor is adjusted by moving the displacement sensor 40 forward and backward using the miniature stage 80, measurement errors of roundness or coaxiality based on the operator can be minimized.

[0084] (Second Embodiment)

[0085] Figure 9 This is a front view of a roundness measuring device 200 for coating rollers used in battery manufacturing, according to another embodiment of the present invention.

[0086] In this embodiment and the first embodiment, the same reference numerals are given to the same parts, and detailed descriptions of these same parts will be omitted herein.

[0087] The second embodiment differs from the first embodiment in that the predetermined magnet component 61 is installed at both ends of the support component 60 supporting the displacement sensor 40.

[0088] Depending on the specifications or type of coating apparatus, the support member 60 and the displacement sensor 40 may need to be installed in another coating apparatus. Alternatively, even within the same coating apparatus, the installation position of the displacement sensor 40 needs to be changed when the coating roller is replaced. In this case, the displacement sensor 40 can be easily attached and detached when the magnet member 61 is installed at both ends of the support member 60 and removed from the support frame 70.

[0089] In particular, when the magnet component 61 is attached to a predetermined position set on the support frame 70, the measurement position of the displacement sensor 40 is standardized, thereby reducing measurement errors based on the measurement personnel.

[0090] Therefore, according to this embodiment, there are the following advantages: the displacement sensor 40 and the support member 60 can be easily attached and detached, and the zero-point adjustment function implemented by the miniature stage 80 is organically combined to further minimize measurement errors.

[0091] The roundness measurement method according to the present invention using a roundness measuring device 100, 200 for coating rollers used in battery manufacturing will be described in detail again.

[0092] First, a plurality of displacement sensors 40 are installed at intervals along the length of the coating roller 20. In this case, the displacement sensors 40 can be installed on the back side of the electrode sheet 2 coated with the electrode slurry. In addition, the displacement sensors 40 are installed in a direction perpendicular to the central axis of the coating roller 20, thus reducing measurement errors.

[0093] After the displacement sensor 40 is installed, the outer diameter of the coating roller at the point facing the displacement sensor 40 is continuously measured as the coating roller 20 rotates.

[0094] The outer diameter of the coating roller is continuously measured, and the change in the outer diameter during one rotation of the coating roller is calculated, i.e., roundness.

[0095] When at least three displacement sensors 40 are installed on the left, center and right sides of the coating roller 20, the roundness of the coating roller 20 is measured using the displacement sensors 40, and the roundness value is substituted into a predetermined equation to measure the degree of deformation of the coating roller shaft, i.e., coaxiality.

[0096] In addition, the displacement sensor 40 is mounted close to and separate from the coating roller 20, so that the roundness of the coating roller can be accurately measured even if the specifications or type of the coating roller is changed.

[0097] In particular, by mounting the displacement sensor 40 on the miniature stage 80 and moving the displacement sensor forward and backward using the miniature stage 80, the zero point of the displacement sensor 40 can be precisely adjusted, thus minimizing measurement errors based on the roundness / coaxiality of the measuring person.

[0098] As described above, according to the present invention, by measuring the roundness or coaxiality of the coating roller in a non-contact manner, the coating quality or occurrence of abnormalities in the electrode slurry can be predicted. Furthermore, not only the roundness of the outer circumference of the coating roller can be measured, but also the central portion of the coating roller actually coated with the electrode slurry can be measured based on the actual production line operating speed of the coating apparatus. Therefore, in terms of coating apparatus control, online measurement can be performed, and by providing roundness data to the controller in real time, coating quality can be improved.

[0099] In addition, by obtaining real-time data on roundness / coaxiality, correlation analysis can be performed with equipment data such as slurry loading, slurry temperature, and air conditioning temperature, and thus the loading / coating process capability can be improved through this correlation analysis.

[0100] As described above, the present invention has been described in more detail with reference to the accompanying drawings and embodiments. Therefore, the configurations described herein or shown in the drawings are merely one embodiment of the present invention and do not represent the full technical spirit of the present invention. It should be understood that various equivalents and variations that can replace the embodiments and configurations may exist at the time of filing this application.

[0101] [Reference Label Explanation]

[0102] 1: Electrode paste

[0103] 2: Metal substrate

[0104] 10: Slit mold head

[0105] 11: Lips

[0106] A: Rotating roller

[0107] 20: Coating roller

[0108] 21: Coating roller shaft

[0109] 30: Dial indicator

[0110] 31: Measuring pointer

[0111] 40: Displacement sensor

[0112] 50: Bracket

[0113] 60: Supporting components

[0114] 70: Supporting Frame

[0115] 80: Linear moving mechanism (miniature stage)

[0116] 81: Upper loading platform

[0117] 82: Download Platform

[0118] 83: Driver

[0119] 84: Cylinder block components

[0120] 85: Fixing plate

[0121] 100 and 200: Roundness measuring devices for coating rollers used in battery manufacturing

Claims

1. A roundness measuring device for a coating roller, wherein the coating roller supports the electrode sheet when the electrode sheet is coated with electrode slurry, the roundness measuring device comprising: A displacement sensor, spaced apart from the coating roller and configured to measure the roundness of the coating roller in a non-contact manner; A support member, on which the displacement sensor is mounted, and the support member extends along the length of the coating roller. The displacement sensors are mounted as multiple displacement sensors on the support member along the length direction of the coating roller, and A linear movement mechanism is configured to move the displacement sensor forward and backward to allow the displacement sensor to approach and separate from the coating roller. The linear movement mechanism is mounted on the support member. The linear motion mechanism includes a miniature stage, and the displacement sensor is mounted on the miniature stage to move forward and backward. The zero point of the displacement sensor is adjusted by moving the displacement sensor forward and backward using the miniature stage.

2. The roundness measuring device according to claim 1, wherein the displacement sensor is installed on the other side of the electrode sheet coated with the electrode slurry.

3. The roundness measuring device according to claim 1, wherein the displacement sensor is installed as a total of three displacement sensors, facing the left, center and right sides of the coating roller.

4. The roundness measuring device according to claim 3, wherein the coaxiality of the coating roller is measured by means of the roundness measurement of the three displacement sensors.

5. The roundness measuring device according to claim 1, wherein the displacement sensor is mounted in a direction perpendicular to the central axis of the coating roller.

6. The roundness measuring device according to claim 1, wherein the support member is coupled to the support frame, and the support frame is installed adjacent to both ends of the coating roller.

7. The roundness measuring device according to claim 6, wherein magnet components are installed at both ends of the support member, and the magnet components are attached to predetermined positions of the support frame.

8. A method for measuring the roundness of a coating roller used in battery manufacturing, the roundness measurement method comprising: Multiple displacement sensors are installed along the length of the coating roller, spaced apart from the coating roller. As the coating roller rotates, the outer diameter of the coating roller is continuously measured at a position facing the displacement sensor; and The roundness of the coating roller is calculated by continuously measuring its outer diameter. The roundness of the coating roller is measured using a displacement sensor mounted close to and separate from the coating roller. The displacement sensor is mounted on a miniature stage and moves forward and backward by operating the miniature stage, and the zero point of the displacement sensor is adjusted by moving the displacement sensor forward and backward using the miniature stage.

9. The roundness measurement method as described in claim 8, wherein: The displacement sensors are installed in a total of three, facing the left, center and right sides of the coating roller; and The coaxiality of the coating roller is measured by using the roundness measurement of the three displacement sensors.

10. The roundness measurement method according to claim 8, wherein the displacement sensor is mounted in a direction perpendicular to the central axis of the coating roller to measure the roundness of the coating roller.

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