Rolling device and control device

Abstract

In a roll pressing device, a thickness gauge is provided on the outlet side of the first pressing roller and the second pressing roller, and the thickness of the electrode plate of the secondary battery is detected at three or more points along the width direction of the electrode plate. A calculation unit calculates three characteristic quantities, namely, a first deviation between the thickness target value and the thickness measurement value of the point closest to the first compression mechanism among the three or more points, a second deviation between the thickness target value and the thickness measurement value of the point closest to the second compression mechanism among the three or more points, and a second-order component of the thickness profile of the electrode plate, and adaptively changes the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on the three characteristic quantities.

Description

Technical Field

[0001] The present disclosure relates to a rolling device and a control device for rolling an electrode plate of a secondary battery. Background Art

[0002] In recent years, with the popularization of electric vehicles (EVs), hybrid vehicles (HVs), and plug-in hybrid vehicles (PHVs), the shipments of secondary batteries have been continuously increasing. In particular, the shipments of lithium-ion secondary batteries are increasing. A general secondary battery mainly includes a positive electrode, a negative electrode, a separator, and an electrolyte. In a compression processing step, which is one of the steps for manufacturing a positive electrode plate and a negative electrode plate of a secondary battery, a rolling device (for example, refer to Patent Document 1) is used.

[0003] [Prior Art Documents]

[0004] [Patent Documents]

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-111647 Summary of the Invention

[0006] In the compression processing step of the electrode plate in the rolling device, generally, a thickness accuracy of about 2 μm or less is required. Due to variations in the coating thickness of the electrode material in the previous step, or variations in the outer diameter of the roll caused by processing heat or bearing heat generated during the compression step, thickness variations occur in the length direction and width direction of the electrode plate during compression processing. When the thickness exceeds the manageable range, it is necessary to stop the line and manually reset the pressing conditions to adjust it within the manageable range. Since it is necessary to remove the thickness portion that cannot be applied to the product, the equipment operation rate and the yield rate decrease.

[0007] For secondary batteries, in recent years, there has been an increasing need for miniaturization, light weight, and high capacity, or high capacity at the same manufacturing cost. In battery design, the length of the electrode is determined in such a way that it is accommodated in a battery case together with a cylindrical shape or a square shape. Even for the same electrode length, when the thickness is large, the winding diameter when winding the electrode becomes large. Therefore, the length of the electrode is determined in consideration of the range of thickness variations that may occur during manufacturing. That is, when the thickness accuracy can be increased, the length of the electrode can be increased, and thus a higher-capacity battery design can be performed.

[0008] To solve the above problems, a rolling device according to an aspect of the present disclosure includes: a first pressing roller and a second pressing roller that roll by sandwiching an electrode plate of a secondary battery that is continuously conveyed; a first main bearing portion and a second main bearing portion that are respectively provided on one side and the other side of the rotation shaft of the first pressing roller and rotatably support the rotation shaft; a third main bearing portion and a fourth main bearing portion that are respectively provided on one side and the other side of the rotation shaft of the second pressing roller and rotatably support the rotation shaft; a first bending bearing portion and a second bending bearing portion that are respectively provided on one side and the other side of the rotation shaft of the first pressing roller and rotatably support the rotation shaft; a third bending bearing portion and a fourth bending bearing portion that are respectively provided on one side and the other side of the rotation shaft of the second pressing roller and rotatably support the rotation shaft; a first compression mechanism that can apply a load to at least one of the first main bearing portion and the third main bearing portion in a direction in which the first pressing roller and the second pressing roller approach each other; a second compression mechanism that can apply a load to at least one of the second main bearing portion and the fourth main bearing portion in a direction in which the first pressing roller and the second pressing roller approach each other; a first bending mechanism that can apply a load to at least one of the first bending bearing portion and the third bending bearing portion in a direction in which the first pressing roller and the second pressing roller separate / contact each other; a second bending mechanism that can apply a load to at least one of the second bending bearing portion and the fourth bending bearing portion in a direction in which the first pressing roller and the second pressing roller separate / contact each other; a thickness gauge that is provided on the outlet side of the first pressing roller and the second pressing roller and detects the thickness of the electrode plate of the secondary battery at three or more points along the width direction of the electrode plate; a calculation unit that calculates setting values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on thickness measurement values at three or more points and a thickness target value based on the detection values of the thickness gauge; and a control unit that controls the loads of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism respectively based on the setting values calculated by the calculation unit. The calculation unit calculates three characteristic quantities, namely, a first deviation between the thickness target value and the thickness measurement value of the point closest to the first compression mechanism side among the three or more points, a second deviation between the thickness target value and the thickness measurement value of the point closest to the second compression mechanism side among the three or more points, and a second-order component of the thickness profile of the electrode plate, and adaptively changes the setting values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on the three characteristic quantities.

[0009] According to the present disclosure, it is possible to improve the accuracy of thickness control of the rolling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic front view of the rolling device of Embodiment 1.

[0011] Figure 2 It is a schematic front view of the rolling device of Embodiment 2.

[0012] Figure 3 It is a schematic front view of the rolling device of Embodiment 3.

[0013] Figure 4 It is a schematic side view of the rolling devices of Embodiments 1 to 3.

[0014] Figure 5 It is a diagram for explaining Feedback Control Example 1 using the first control disk and the second control disk.

[0015] Figure 6 It is a diagram for explaining Feedback Control Example 2 using the first control disk and the second control disk.

[0016] Figure 7 It is a diagram for explaining Feedback Control Example 3 using the first control disk and the second control disk.

[0017] Figure 8 It is a diagram for explaining Feedback Control Example 4 using the first control disk and the second control disk.

[0018] Figure 9 It is a diagram depicting the relationship between the change in the thickness of the electrode plate and the change in the linear velocity under certain pressing and bending conditions of a certain rolling device.

[0019] Figure 10 It is a diagram for explaining Feedforward Control Example 1 using the first control disk.

[0020] Figure 11 It is a diagram for explaining Feedforward Control Example 2 using the first control disk.

[0021] Figure 12 It is a diagram for explaining Feedforward Control Example 3 using the first control disk. Detailed implementation manners

[0022] Figure 1It is a schematic front view of the rolling device of Embodiment 1. The first pressing roller 11 and the second pressing roller 12 are a pair of upper and lower rollers that bite into the rolled material (roll bite) and are relatively arranged so as to be freely contactable / separable. The pair of the first pressing roller 11 and the second pressing roller 12 roll the electrode plate 2 by sandwiching the electrode plate 2 of the secondary battery that is continuously conveyed. The electrode plate 2 of the secondary battery passing through the rolling device is a thin plate-shaped electrode material obtained by coating a slurry containing an active material on a metal foil and drying it. For example, the positive electrode plate of a lithium-ion secondary battery is manufactured as follows: a slurry containing a positive electrode active material such as lithium cobaltate or lithium iron phosphate is coated on an aluminum foil. In addition, the negative electrode plate of a lithium-ion secondary battery is manufactured by the following method: a slurry containing a negative electrode active material such as graphite is coated on a copper foil. In the thickness of the electrode plate 2 passing through the rolling device, the thickness of the coated active material accounts for the majority.

[0023] The first main bearing portion 21 and the second main bearing portion 22 are respectively provided on one side and the other side of the rotating shaft of the first pressing roller 11 and rotatably support the rotating shaft. The third main bearing portion 23 and the fourth main bearing portion 24 are respectively provided on one side and the other side of the rotating shaft of the second pressing roller 12 and rotatably support the rotating shaft.

[0024] The first bending bearing portion 31 and the second bending bearing portion 32 are respectively provided on one side and the other side of the rotating shaft of the first pressing roller 11 and rotatably support the rotating shaft. The third bending bearing portion 33 and the fourth bending bearing portion 34 are respectively provided on one side and the other side of the rotating shaft of the second pressing roller 12 and rotatably support the rotating shaft.

[0025] In Figure 1 In the example shown, the first main bearing portion 21 to the fourth main bearing portion 24 and the first bending bearing portion 31 to the fourth bending bearing portion 34 are respectively constituted by bearing boxes, and the bearing boxes house bearings that rotatably support the rotating shafts of the rollers.

[0026] The first compression mechanism 41 is a mechanism that can compress the electrode plate 2 by applying a load in the direction in which the first pressing roller 11 and the second pressing roller 12 approach to at least one of the first main bearing portion 21 and the third main bearing portion 23. The second compression mechanism 42 is a mechanism that can compress the electrode plate 2 by applying a load in the direction in which the first pressing roller 11 and the second pressing roller 12 approach to at least one of the second main bearing portion 22 and the fourth main bearing portion 24.

[0027] In Embodiment 1, as the first compression mechanism 41, a first pressing cylinder 41a and a first electric screw 41b are provided. The first pressing cylinder 41a can apply a load to the third main bearing portion 23, and the first electric screw 41b can apply a load to the first main bearing portion 21. As the second compression mechanism 42, a second pressing cylinder 42a and a second electric screw 42b are provided. The second pressing cylinder 42a can apply a load to the fourth main bearing portion 24, and the second electric screw 42b can apply a load to the second main bearing portion 22. For the pressure control of the first pressing cylinder 41a and the second pressing cylinder 42a, for example, an oil pressure servo valve and a pressure reducing valve can be used. For the position control of the first electric screw 41b and the second electric screw 42b, a servo motor is used. The pressing amounts of the first electric screw 41b and the second electric screw 42b are respectively controlled by their respective servo motors, so that the loads applied by the first electric screw 41b and the second electric screw 42b to the first main bearing portion 21 and the second main bearing portion 22 are controlled.

[0028] The first bending mechanism 51 (in Embodiment 1, it is the first bending cylinder 51a) is a mechanism as follows: It is provided between the first bending bearing portion 31 and the third bending bearing portion 33, and can correct the deflection of the roll by applying a load in the direction of separating / contacting the first pressing roll 11 and the second pressing roll 12. The second bending mechanism 52 (in Embodiment 1, it is the second bending cylinder 52a) is a mechanism as follows: It is provided between the second bending bearing portion 32 and the fourth bending bearing portion 34, and can correct the deflection of the roll by applying a load in the direction of separating / contacting the first pressing roll 11 and the second pressing roll 12.

[0029] Through the pressure change of the first compression mechanism 41 and / or the second compression mechanism 42 based on the pressing pressure control unit 817a (refer to Figure 5 ), the roll gap between the first pressing roll 11 and the second pressing roll 12 is controlled. Along with the change of the roll gap, the roll deflection also changes. Through the pressure change of the first bending mechanism 51 and / or the second bending mechanism 52 based on the bending pressure control unit 818a (refer to Figure 5 ), the roll deflection amount can be corrected. At this time, the roll gap also changes, playing a role opposite to the pressure change based on the first compression mechanism 41 and / or the second compression mechanism 42.

[0030] The first preloading mechanism 61 (in the example shown in Figure 1 is the first preloading cylinder 61a) is a mechanism as follows: It applies a certain load to the first bending bearing portion 31 in the direction of separating / contacting the first pressing roll 11 and the second pressing roll 12. The second preloading mechanism 62 (in Figure 1In the example shown, the second preloading cylinder 62a) is a mechanism that applies a certain load to the second bending bearing portion 32 in the direction in which the first pressing roller 11 and the second pressing roller 12 are separated / contacted. The pressures of the first preloading cylinder 61a and the second preloading cylinder 62a are fixed and are always set to the same pressure.

[0031] In Figure 1 In the example shown, the first preloading mechanism 61 and the second preloading mechanism 62 apply a preloading weight greater than the self-weight of the first pressing roller 11 to the first bending bearing portion 31 and the second bending bearing portion 32. As a result, the first pressing roller 11 is moderately pressed (tensioned) upward, reducing the influence of the shaking of the roll pressing device. In addition, the first preloading mechanism 61 and the second preloading mechanism 62 can be omitted.

[0032] Figure 2 It is a schematic front view of the roll pressing device of Embodiment 2. Hereinafter, the differences from the configuration of Embodiment 1 will be described. In Embodiment 1, between the upper first bending bearing portion 31 and the second bending bearing portion 32 and the lower third bending bearing portion 33 and the fourth bending bearing portion 34, the first bending cylinder 51a and the second bending cylinder 52a are provided, and the first bending mechanism 51 and the second bending mechanism 52 of the type that applies a load in the direction in which the first pressing roller 11 and the second pressing roller 12 are separated / contacted are adopted.

[0033] In Embodiment 2, as the first bending mechanism 51 and the second bending mechanism 52, a third bending cylinder 51b is provided outside the first bending bearing portion 31, a fourth bending cylinder 52b is provided outside the second bending bearing portion 32, a fifth bending cylinder 51c is provided outside the third bending bearing portion 33, and a sixth bending cylinder 52c is provided outside the fourth bending bearing portion 34. In Embodiment 2, according to these third bending cylinder 51b, fourth bending cylinder 52b, fifth bending cylinder 51c, and sixth bending cylinder 52c, the type of applying a load in the direction in which the first pressing roller 11 and the second pressing roller 12 are separated / contacted is adopted. In Embodiment 2, the first preloading mechanism 61 and the second preloading mechanism 62 are not provided.

[0034] In Embodiment 2, as the first compression mechanism 41, it includes a first pressing cylinder 41a, a first magnetic scale 41c, and a first load sensor 41d. In Embodiment 2, for the pressure control of the first pressing cylinder 41a, an oil pressure servo valve is used. The first magnetic scale 41c detects the position of the first pressing cylinder 41a. In Embodiment 2, in the first main bearing portion 21, a load caused by the self-weight of the first pressing roller 11 is applied. The first load sensor 41d is a compression-type load sensor and detects the load applied to the first main bearing portion 21. The configuration of the second compression mechanism 42 is the same as that of the first compression mechanism 41, so the description thereof is omitted. In Embodiment 2, the first electric screw 41b and the second electric screw 42b are not provided.

[0035] Figure 3 FIG. is a schematic front view of the roll pressing device according to Embodiment 3. Hereinafter, the differences from the configuration of Embodiment 1 will be described. The first bending mechanism 51 and the second bending mechanism 52 in Embodiment 3 adopt the same types as the first bending mechanism 51 and the second bending mechanism 52 in Embodiment 2.

[0036] The first compression mechanism 41 and the second compression mechanism 42 in Embodiment 3 do not have the first electric screw 41b and the second electric screw 42b in Embodiment 1, but are provided with a first electric pin 41e and a second electric pin 42e. The first load sensor 41d and the second load sensor 42d are not provided. Generally, the roll pressing device in Embodiment 3 can be manufactured at a lower cost than the roll pressing devices in Embodiments 1 and 2.

[0037] The first electric pin 41e is provided between the first main bearing portion 21 and the third main bearing portion 23. The first electric pin 41e includes an upper pin fixed to the first main bearing portion 21 and a lower pin fixed to the third main bearing portion 23. The lower surface of the upper pin and the upper surface of the lower pin are respectively conical surfaces and are arranged with their conical surfaces facing each other. In the lower pin, a linear servo motor is provided for moving the lower pin in the left-right direction (the direction of the conical surface). Since the lower pin slides left and right, the height of the first electric pin 41e can be adjusted. In Figure 3 the example shown, when the lower pin slides to the left, the height of the first electric pin 41e becomes lower, and when it slides to the right, the height of the first electric pin 41e becomes higher. That is, the more the lower pin slides to the left, the greater the load in the direction of approaching the first pressing roller 11 and the second pressing roller 12.

[0038] The second electric pin 42e is disposed between the second main bearing portion 22 and the fourth main bearing portion 24. The second electric pin 42e includes an upper pin fixed to the second main bearing portion 22 and a lower pin fixed to the fourth main bearing portion 24. The configuration of the second electric pin 42e is the same as that of the first electric pin 41e, and thus the description thereof is omitted.

[0039] Figure 4 FIG. 4 is a schematic side view of the rolling device 1 according to Embodiments 1 to 3. A pay-off reel 13 is provided on the inlet side of the pair of first pressure rollers 11 and second pressure rollers 12, and a take-up reel 14 is provided on the outlet side. The pay-off reel 13 pays out the sheet-like electrode plate 2 wound in a coil shape to the pair of first pressure rollers 11 and second pressure rollers 12. The take-up reel 14 winds up the electrode plate 2 compression-machined by the pair of first pressure rollers 11 and second pressure rollers 12 into a coil shape.

[0040] The motor 15 is a motor that drives the first pressure roller 11 and the second pressure roller 12. A pulse generator 16 is mounted on the driving motor 15 to detect the rotational speed of the motor 15.

[0041] The thickness gauge 70 is provided on the outlet side of the pair of first pressure rollers 11 and second pressure rollers 12, and detects the thickness of the electrode plate 2 at three points, namely, a first point, a second point, and a third point, arranged in the width direction of the electrode plate 2. The first point is set at one end of the electrode plate 2 on the side where the first compression mechanism 41 is provided. The second point is set at the central portion of the electrode plate 2. The third point is set at one end of the electrode plate 2 on the side where the second compression mechanism 42 is provided.

[0042] In a general rolling device 1, a screen operated by an operator is provided on the opposite side (in Embodiments 1 to 3, the second compression mechanism 42 side) of the side where the motor 15 is provided (in Embodiments 1 to 3, the first compression mechanism 41 side). Therefore, hereinafter, in Embodiments 1 to 3, the first point is referred to as the drive side, the second point is referred to as the central portion, and the third point is referred to as the operation side. That is, the thickness gauge 70 detects the thicknesses of the drive side, the central portion, and the operation side of the compression-machined electrode plate 2, respectively.

[0043] Alternatively, the thickness gauge 70 may continuously detect the thickness of the electrode plate 2 by scanning one thickness detection sensor in the width direction of the electrode plate 2, and thereby extract the thicknesses of the drive side, the central portion, and the operation side, respectively.

[0044] In addition, alternatively, the thickness gauge 70 may fixedly arrange three thickness detection sensors on the drive side, the central portion, and the operation side, respectively, and detect the thicknesses of the drive side, the central portion, and the operation side with the three thickness detection sensors, respectively.

[0045] Alternatively, as a detection method of the thickness gauge 70, the following method can be used: the distances to both sides of the electrode plate 2 are respectively detected by a laser sensor or an optical sensor, and the thickness is detected based on their positional relationship. In addition, the following method can also be used: the change in eddy current is detected by a magnetic sensor to detect the distance to the outer diameter surface of the electrode plate 2, the distance to the surface of the electrode plate 2 on the guide roller is detected by a laser sensor or an optical sensor, and the thickness is detected based on the positional relationship between the guide roller and the surface of the electrode plate 2. Additionally, the distance to the surface of the electrode plate 2 can be detected by using a sensor with a white light confocal method.

[0046] The control device 80 is a device for controlling the entire roll pressing device 1. In the Figure 4 example shown, it includes a first control panel 81 and a second control panel 82. The first control panel 81 is a control panel for the pressing system, and the second control panel 82 is a control panel for the thickness system. The rotation pulse generated by the pulse generator 16 is input to the first control panel 81. The thickness detection value detected by the thickness gauge 70 is input to the second control panel 82. The structure described by Figure 4 is common in Embodiments 1 to 3.

[0047] Figure 5 FIG. is for explaining Feedback Control Example 1 using the first control panel 81 and the second control panel 82. Feedback Control Example 1 is a control used in the roll pressing device of Embodiment 1 shown in Figure 1 In Feedback Control Example 1, as the compression mechanism, the first pressing cylinder 41a and the second pressing cylinder 42a are used. As the bending mechanism, the first bending cylinder 51a and the second bending cylinder 52a are used. The first control panel 81 is configured to include a PLC (Programmable Logic Controller), a PC (Personal Computer), an HMI (Human Machine Interface), and an actuator controller, etc. The second control panel is configured to include a PLC, a PC, and a sensor controller, etc.

[0048] The program operating in the PLC is generated by a dedicated application in the PC and downloaded to the PLC. In addition, the product information of the electrode plate 2 is input from the MES (Manufacturing Execution System) to the PLC. In addition, various set values input by the operator are input to the PLC via the HMI. In the feedback control example 1, among these set values, there are included the target value of the thickness of the electrode plate 2, the pressure set values of the first pressing cylinder 41a and the second pressing cylinder 42a, the pressure set values of the first bending cylinder 51a, and the second bending cylinder 52a. The HMI receives the input from the operator and displays the driving status, alarms, etc., or outputs sounds.

[0049] Figure 5 Associated with the feedback control example 1, the functional blocks implemented by the first control panel 81 and the second control panel 82 are depicted. The first control panel 81 includes a length measurement unit 811, an acquisition timing generation unit 812, a thickness measurement value acquisition unit 813, a feature quantity calculation unit 814, a correction value calculation unit 815, a set value correction unit 816, a pressing pressure control unit 817a, a PID control unit 817b, a pressing pressure deviation calculation unit 817c, a bending pressure control unit 818a, a PID control unit 818b, and a bending pressure deviation calculation unit 818c. The second control panel 82 includes a thickness measurement value calculation unit 821.

[0050] Rotation pulses are input from the pulse generator 16 to the length measurement unit 811. The length measurement unit 811 estimates the rotational speeds of the first pressing roller 11 and the second pressing roller 12 based on the input rotation pulses, and estimates the speed of the electrode plate 2 passing between the first pressing roller 11 and the second pressing roller 12. The length measurement unit 811 measures the length (distance) that the electrode plate 2 advances per unit time based on the estimated speed of the electrode plate 2. The length measurement unit 811 supplies the measured length of the electrode plate 2 to the acquisition timing generation unit 812 and the thickness measurement value calculation unit 821.

[0051] The thickness detection values on the drive side, the central part, and the operation side are input from the thickness gauge 70 to the thickness measurement value calculation unit 821. In addition, the length of the electrode plate 2 is input from the length measurement unit 811.

[0052] In the case where three thickness detection sensors are fixed in the thickness gauge 70 to detect the thickness, in order to remove the high-frequency thickness variations that do not need to be controlled, the thickness measurement value calculation unit 821 averages and filters the three thickness detection values in the length direction (travel direction) of the electrode plate 2. In order to remove the sharp changes in the travel direction caused by the coating pump pulsation, etc. in the coating process, it is preferable to calculate an average value of 5 mm or more in the travel direction.

[0053] For example, when the thickness detection values are input at intervals of 1 mm (pitch), the thickness measurement value calculation unit 821 calculates the moving average of five points in the traveling direction and uses it as the measurement value. Alternatively, it may be to calculate the average value of three points excluding the two most deviated points among the five points detected in the traveling direction and use it as the measurement value. When calculating the moving average, the thickness measurement value calculation unit 821 uses the length of the electrode plate 2 input from the length measurement unit 811 as a synchronization signal. In addition, the detection values corresponding to the uncoated portion of the slit in the width direction of the electrode plate 2 or the portion coated on only one side are removed.

[0054] Alternatively, in the thickness gauge 70, when one thickness detection sensor scans in the width direction of the electrode plate 2 to detect the thickness, the thickness measurement value calculation unit 821 calculates the average value of the detection values in the preset width ranges of the drive side, the central portion, and the operation side, and uses it as the measurement value. Furthermore, it may be to average the measurement value in the traveling direction as described above and use it as the final measurement value.

[0055] The thickness measurement value calculation unit 821 supplies the calculated drive side thickness measurement value T m , the central thickness measurement value T c , and the operation side thickness measurement value T s to the thickness measurement value acquisition unit 813.

[0056] The acquisition timing generation unit 812 generates the timing for the thickness measurement value acquisition unit 813 to acquire the drive side thickness measurement value T m , the central thickness measurement value T c , and the operation side thickness measurement value T s supplied from the thickness measurement value calculation unit 821, and supplies the generated timing to the thickness measurement value acquisition unit 813.

[0057] There is a distance L t (the pass line length L t ) between the pressing positions of the first pressing roller 11 and the second pressing roller 12 and the thickness gauge 70. Therefore, there is a time lag before the thickness change caused by the pressure change of the first pressing roller 11 and the second pressing roller 12 is detected by the thickness gauge 70. In addition, there is also a time lag t d before the actual pressure change of the compression mechanism and / or the bending mechanism is completed after changing the pressure setting value of the compression mechanism and / or the bending mechanism.

[0058] Among the pressing cylinders controlled by the oil pressure servo valve, the pressing cylinders controlled by the pressure reducing valve, the electric screw, and the electric pin, the pressing cylinder controlled by the oil pressure servo valve has the highest responsiveness. When using the pressing cylinder controlled by the oil pressure servo valve, the control system time lag td will be minimized.

[0059] The pass line length L t and the control system time delay t d are pre-measured in advance, and the measured values are set as fixed values in the acquisition timing generation unit 812. The acquisition timing generation unit 812 uses the length parameter L for comparison with the pass line length L t and the time parameter t for comparison with the control system time delay t d The acquisition timing generation unit 812 increases the length parameter L based on the length of the electrode plate 2 supplied from the length measurement unit 811, and increases the control system time delay t based on the clock supplied from the clock d .

[0060] When at least one of the pressure set values in the first pressing cylinder 41a, the second pressing cylinder 42a, the first bending cylinder 51a, and the second bending cylinder 52a is changed by the set value correction unit 816, the acquisition timing generation unit 812 resets the length parameter L and the time parameter t to zero. When the length parameter L exceeds the pass line length L t , and the time parameter t exceeds the control system time delay t d , the acquisition timing generation unit 812 supplies the acquisition timing to the thickness measurement value acquisition unit 813.

[0061] The state where the length parameter L exceeds the pass line length L t , and the time parameter t exceeds the control system time delay t d is a state where the thickness change of the electrode plate 2 caused by the change of at least one of the pressure set values of the first pressing cylinder 41a, the second pressing cylinder 42a, the first bending cylinder 51a, and the second bending cylinder 52a is reflected in the detection value of the thickness gauge 70.

[0062] On the other hand, the state where the length parameter L does not exceed the pass line length L t , or the state where the time parameter t does not exceed the control system time delay t d is a state where the thickness change of the electrode plate 2 caused by the change of at least one of the pressure set values of the first pressing cylinder 41a, the second pressing cylinder 42a, the first bending cylinder 51a, and the second bending cylinder 52a is not reflected in the detection value of the thickness gauge 70. This state is a state where the influence of the change of the above pressure set value on the thickness of the electrode plate 2 cannot be confirmed.

[0063] Therefore, it is necessary to wait until the length parameter L exceeds the pass line length L t , and the time parameter t exceeds the control system time delay t dThe state is such that before becoming this state, changes in the next pressure set value are retained. Thus, useless or excessive changes in the pressure set values of the first pressing cylinder 41a, the second pressing cylinder 42a, the first bending cylinder 51a, and the second bending cylinder 52a are avoided, and effective adjustment of the pressure set value becomes possible.

[0064] The thickness measurement value acquisition unit 813 acquires the drive-side thickness measurement value T supplied from the thickness measurement value calculation unit 821 at the timing supplied from the acquisition timing generation unit 812 m , the center thickness measurement value T c and the operation-side thickness measurement value T s , and supplies them to the feature quantity calculation unit 814.

[0065] The drive-side thickness measurement value T m , the center thickness measurement value T c and the operation-side thickness measurement value T s are input from the thickness measurement value acquisition unit 813 to the feature quantity calculation unit 814. In addition, the thickness target value T t set by the operator is input to the feature quantity calculation unit 814.

[0066] The feature quantity calculation unit 814 calculates three deviation feature quantities defined by the following (Equation 1) to (Equation 3) as the thickness feature quantities to be controlled based on the drive-side thickness measurement value T m , the center thickness measurement value T c , the operation-side thickness measurement value T s and the thickness target value T t . The first feature quantity T t－m is defined as the difference between the thickness target value T t and the drive-side thickness measurement value T m . The second feature quantity T t－s is defined as the difference between the thickness target value T t and the operation-side thickness measurement value T s . The third feature quantity T drop is defined as the difference between the center thickness measurement value T c and the average value of the drive-side thickness measurement value T m and the operation-side thickness measurement value T s .

[0067] T t－m = T t - T m ……(Equation 1)

[0068] T t－s = T t - T s ……(Equation 2)

[0069] Tdrop = T c - T ms,ave = T c - (T m + T s ) / 2......(Equation 3)

[0070] At the first characteristic quantity T t－m = 0, the second characteristic quantity T t－s = 0, the third characteristic quantity T drop = 0, the drive side thickness measurement value T m = the center thickness measurement value T c = the operation side thickness measurement value T s = the thickness target value T t . The third characteristic quantity T drop represents the quadratic component of the thickness profile (when the value is large, it is a convex parabola shape), and changes according to the magnitude and orientation of the roll deflection.

[0071] The characteristic quantity calculation unit 814 supplies the calculated first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop to the correction value calculation unit 815.

[0072] According to the experiments of the inventors of the present invention: between the first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop and the load, there is a relationship defined by the following (Equation 4) to (Equation 6).

[0073] T t－m ∝ (drive side load)......(Equation 4)

[0074] T t－s ∝ (operation side load)......(Equation 5)

[0075] T drop ∝ A × (total pressing load) - B × (total bending load) - C × (total preloading load)......(Equation 6)

[0076] Here, the total pressing load is the sum of the drive side pressing load and the operation side pressing load, the total bending load is the sum of the drive side bending load and the operation side bending load, and the total preloading load is the sum of the drive side preloading load and the operation side preloading load. The drive side load is the drive side load generated by the drive side pressing cylinder, the drive side bending cylinder, and the drive side preloading cylinder. The operation side load is the operation side load generated by the operation side pressing cylinder, the operation side bending cylinder, and the operation side preloading cylinder.

[0077] The pressure cylinder load acts in the direction of applying pressure to the material being rolled, and the bending load and the preload act in the direction of reducing the pressure on the material being rolled. The preload cylinder load is set to a fixed value as follows: a pressing pressure that ensures that the roll deflection is not excessively generated and that the shaking or vibration of the equipment is reduced. That is, in thickness control, the preload does not change. In addition, when the preload cylinder load is too large, it is difficult to control the roll deflection within the control range of the pressing pressure and the bending pressure. In addition, in the case of equipment not provided with the first preload cylinder 61a and the second preload cylinder 62a, the preload is zero.

[0078] A, B, and C in the above (Equation 6) are positive constants, representing the differences between the drive-side load and the operation-side load of the total pressing load, the total bending load, and the total preload respectively, on the third characteristic quantity T drop The resulting effects are different.

[0079] By measuring the proportional constants on the left and right sides of the above (Equations 4) to (6) in advance, when the total preload is a fixed value, or when the preload mechanism is not provided, according to the above (Equations 4) to (6), the total pressing load and the total bending load that make the first characteristic quantity T t－m 、the second characteristic quantity T t－s 、the third characteristic quantity T drop simultaneously zero can be uniquely obtained.

[0080] In feedback control example 1, each load is controlled by controlling the pressure of each cylinder. The load is calculated by the cylinder diameter (constant) × cylinder pressure. According to the above (Equations 4) to (6), for the drive-side pressing pressure P m 、the operation-side pressing pressure P s 、the drive-side bending pressure B m 、the operation-side bending pressure B s 、the drive-side preload pressure R m 、the operation-side preload pressure R s 、the average pressing pressure P ave =(P m +P s ) / 2、the average bending pressure B ave =(B m +B s ) / 2、the average preload pressure R ave =(R m +R s ) / 2、the first characteristic quantity T t－m 、the second characteristic quantity T t－s 、and the third characteristic quantity T dropAmong them, the following relationships of (Equation 7) to (Equation 15) hold. Specifically, the following (Equation 7) to (Equation 9) are derived from the above (Equation 4), the following (Equation 10) to (Equation 12) are derived from the above (Equation 5), and the following (Equation 13) to (Equation 15) are derived from the above (Equation 6).

[0081] T t－m ∝P m ……(Equation 7)

[0082] T t－m ∝-B m ……(Equation 8)

[0083] T t－m ∝-R m ……(Equation 9)

[0084] T t－s ∝P s ……(Equation 10)

[0085] T t－s ∝-B s ……(Equation 11)

[0086] T t－s ∝-R s ……(Equation 12)

[0087] T drop ∝P ave ……(Equation 13)

[0088] T drop ∝-B ave ……(Equation 14)

[0089] T drop ∝-R ave ……(Equation 15)

[0090] The proportionality constants of the above (Equation 7) to (Equation 8), the above (Equation 10) to (Equation 11), and the above (Equation 13) to (Equation 14) are measured in advance. When the preload pressure is constant or when the preload mechanism is not provided, the pressure difference between the driving-side bending pressure B m and the operating-side bending pressure B s is fixed. At this time, according to the relevant relationships shown in the above (Equation 7) and (Equation 10), the first characteristic quantity T t－m and the second characteristic quantity T t－s can be respectively obtained as zero, and the driving-side pressure application pressure P m , the driving-side pressure application pressure correction value ΔP s of the operating-side pressure application pressure P m , and the operating-side pressure application pressure correction value ΔP s .

[0091] Based on the correlation shown in the above (Equation 13), the driving side pressing pressure P can be obtained m and the change amount of the third characteristic quantity T s accompanied by the correction of the operating side pressing pressure P drop . Based on the correlation shown in the above (Equation 14) and the change amount of this third characteristic quantity T drop , the average bending pressure B drop for making the third characteristic quantity T ave zero can be obtained, and the correction value ΔB ave . Since the difference between the driving side bending pressure B m and the operating side bending pressure B s is fixed, the driving side bending pressure B m , the driving side bending pressure correction value ΔB s of the operating side bending pressure B m , and the operating side bending pressure correction value ΔB s can be obtained

[0092] By controlling the pressure of each cylinder, the thickness across the entire width of the electrode plate 2 can be controlled to the target value T t , so that the pressure of the first pressing cylinder 41a becomes the corrected driving side pressing pressure set value P m +ΔP m , the pressure of the second pressing cylinder 42a becomes the corrected operating side pressing pressure set value P s +ΔP s , the pressure of the first bending cylinder 51a becomes the corrected driving side bending pressure set value B m +ΔB m , and the pressure of the second bending cylinder 52a becomes the corrected operating side bending pressure set value B s +ΔB s

[0093] The first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are supplied from the characteristic quantity calculation unit 814 to the correction value calculation unit 815. In addition, the driving side pressing pressure set value P m , the operating side pressing pressure set value P s , the driving side bending pressure set value B m , and the operating side bending pressure set value B s input by the operator via the HMI are supplied. Under standard conditions, the values pre-derived in such a way that the first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are all zero are respectively set as the driving side pressing pressure set value P​m , the set value P of the pressing pressure on the operation side s , the set value B of the bending pressure on the driving side m , and the set value B of the bending pressure on the operation side s .

[0094] The correction value calculation unit 815 calculates the driving side pressing pressure correction value ΔP based on the first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop , and the proportionality constants of the above (Equation 7), (Equation 8), (Equation 10), (Equation 11), (Equation 13), and (Equation 14) to calculate the driving side pressing pressure correction value ΔP m , the operation side pressing pressure correction value ΔP s , the driving side bending pressure correction value ΔB m , and the operation side bending pressure correction value ΔB s . The correction value calculation unit 815 supplies the calculated driving side pressing pressure correction value ΔP m , the operation side pressing pressure correction value ΔP s , the driving side bending pressure correction value ΔB m , and the operation side bending pressure correction value ΔB s to the set value correction unit 816

[0095] The driving side pressing pressure correction value ΔP m , the operation side pressing pressure correction value ΔP s , the driving side bending pressure correction value ΔB m , and the operation side bending pressure correction value ΔB s are supplied from the correction value calculation unit 815 to the set value correction unit 816. In addition, the set value P of the driving side pressing pressure input by the operator via the HMI m , the set value P of the operation side pressing pressure s , the set value B of the driving side bending pressure m , and the set value B of the operation side bending pressure s are supplied

[0096] The set value correction unit 816 adds the driving side pressing pressure correction value ΔP m , the operation side pressing pressure correction value ΔP s , the driving side bending pressure correction value ΔB m , and the operation side bending pressure correction value ΔB s to the set value P of the driving side pressing pressure m , the operation side pressing pressure correction value ΔP s , the driving side bending pressure correction value ΔB m , and the operation side bending pressure correction value ΔB s, and calculate the corrected driving side pressing pressure set value P m +ΔP m , the corrected operating side pressing pressure set value P s +ΔP s , the corrected driving side bending pressure set value B m +ΔB m , and the corrected operating side bending pressure set value B s +ΔB s .

[0097] The set value correction unit 816 supplies the calculated corrected driving side pressing pressure set value P m +ΔP m , the corrected operating side pressing pressure set value P s +ΔP s to the pressing pressure deviation calculation unit 817c, and supplies the corrected driving side bending pressure set value B m +ΔB m , the corrected operating side bending pressure set value B s +ΔB s to the bending pressure deviation calculation unit 818c.

[0098] The pressing pressure deviation calculation unit 817c calculates the deviation between the corrected driving side pressing pressure set value P m +ΔP m supplied from the set value correction unit 816 and the measured pressure value of the first pressing cylinder 41a, and the deviation between the corrected operating side pressing pressure set value P s +ΔP s and the measured pressure value of the second pressing cylinder 42a. The measured pressure value of the first pressing cylinder 41a and the measured pressure value of the second pressing cylinder 42a can be estimated respectively according to, for example, the measurement value of the valve opening meter.

[0099] The pressing pressure deviation calculation unit 817c supplies the calculated pressure deviation of the first pressing cylinder 41a and the pressure deviation of the second pressing cylinder 42a to the PID control unit 817b. The PID control unit 817b generates the operation amount of the pressure of the first pressing cylinder 41a and the operation amount of the pressure of the second pressing cylinder 42a based on the pressure deviation of the first pressing cylinder 41a and the pressure deviation of the second pressing cylinder 42a.

[0100] Alternatively, instead of using PID compensation, P compensation, PI compensation, or PD compensation can be used. In P compensation, the proportional term (steady deviation) can be controlled, in I compensation, the integral term can be controlled, and in D compensation, the differential term can be controlled.

[0101] The PID control unit 817b supplies the generated operation amounts of the pressure of the first pressing cylinder 41a and the pressure of the second pressing cylinder 42a to the pressing pressure control unit 817a. The pressing pressure control unit 817a includes an actuator and drives the first pressing cylinder 41a and the second pressing cylinder 42a respectively based on the operation amount of the pressure of the first pressing cylinder 41a and the operation amount of the pressure of the second pressing cylinder 42a.

[0102] The bending pressure deviation calculation unit 818c calculates the deviation between the corrected driving side bending pressure set value B m +ΔB m supplied from the set value correction unit 816 and the measured pressure value of the first bending cylinder 51a, and the deviation between the corrected operating side bending pressure set value B s +ΔB s and the measured pressure value of the second bending cylinder 52a.

[0103] The bending pressure deviation calculation unit 818c supplies the calculated pressure deviation of the first bending cylinder 51a and the pressure deviation of the second bending cylinder 52a to the PID control unit 818b. The PID control unit 818b generates the operation amount of the pressure of the first bending cylinder 51a and the operation amount of the pressure of the second bending cylinder 52a based on the pressure deviation of the first bending cylinder 51a and the pressure deviation of the second bending cylinder 52a.

[0104] The PID control unit 818b supplies the generated operation amount of the pressure of the first bending cylinder 51a and the operation amount of the pressure of the second bending cylinder 52a to the bending pressure control unit 818a. The bending pressure control unit 818a includes an actuator and drives the first bending cylinder 51a and the second bending cylinder 52a respectively based on the operation amount of the pressure of the first bending cylinder 51a and the operation amount of the pressure of the second bending cylinder 52a.

[0105] In this way, in feedback control example 1, feedback control is performed so that the pressure of the pressing cylinder is maintained at the set value. The operation object is the pressure of the pressing cylinder. In addition, feedback control is performed so that the pressure of the bending cylinder is maintained at the set value. The operation object is the pressure of the bending cylinder. By applying the correction value calculated based on the thickness measurement value to the set value of the pressing cylinder pressure and the set value of the bending cylinder pressure, the thickness of the electrode plate 2 is controlled to the target value.

[0106] Figure 6 It is a diagram for explaining feedback control example 2 using the first control disk 81 and the second control disk 82. Feedback control example 2 is in Figure 2The control used in the rolling device of Embodiment 2 shown below. In Feedback Control Example 2, as the compression mechanism, the first pressing cylinder 41a and the second pressing cylinder 42a are used. As the bending mechanism, at least one of the third bending cylinder 51b and the fifth bending cylinder 51c, and at least one of the fourth bending cylinder 52b and the sixth bending cylinder 52c are used. Hereinafter, the differences from Figure 5 Feedback Control Example 1 shown below will be described. In Feedback Control Example 2, the pressing pressure control unit 817a, the PID control unit 817b, and the pressing pressure deviation calculation unit 817c are not provided, but instead, a cylinder position control unit 817d, a PID control unit 817e, and a cylinder position deviation calculation unit 817f are provided.

[0107] According to the experiments of the inventors of the present invention, it is known that: among the first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop and the drive-side pressing cylinder position G m , the operation-side pressing cylinder position G s , and the average pressing cylinder position G ave = (G m + G s ) / 2, there exists a relationship defined by the following (Equation 16) to (Equation 18).

[0108] T t－m ∝ G m ...... (Equation 16)

[0109] T t－s ∝ G s ...... (Equation 17)

[0110] T drop ∝ -G ave ...... (Equation 18)

[0111] The thickness of the electrode plate 2 does not only increase or decrease due to the change in the pressing cylinder position, and the elastic deformation amounts of the first pressing roller 11 and the second pressing roller 12 caused by the change in the reaction force from the electrode plate 2 also need to be considered.

[0112] The drive-side pressing cylinder position G m , the operation-side pressing cylinder position G s , the average pressing cylinder position G ave and the first characteristic quantity T t－m representing the thickness of the electrode plate 2, the second characteristic quantity T t－s , the third characteristic quantity T drop are obtained in advance through experiments.

[0113] When the drive-side bending pressure B m and the operation-side bending pressure B sWhen the pressure difference is constant, according to the relevant relationships shown in the above (Equation 16) and (Equation 17), the first characteristic quantity T can be obtained respectively t－m and the second characteristic quantity T t－s simultaneously become zero at the position G of the driving side pressure application cylinder m , the position G of the operating side pressure application cylinder s the correction value ΔG of the position of the driving side pressure application cylinder m , and the correction value ΔG of the position of the operating side pressure application cylinder s .

[0114] According to the relevant relationship shown in the above (Equation 18), the position G of the driving side pressure application cylinder can be obtained m and the position G of the operating side pressure application cylinder s the change amount ΔT of the third characteristic quantity T drop accompanied by the correction. According to the relevant relationship shown in the above (Equation 14), the average bending pressure B used to make the third characteristic quantity T drop added with this change amount ΔT drop become zero drop +ΔT drop the correction value ΔB ave . ave .

[0115] By controlling the cylinder positions of the first pressure application cylinder 41a and the second pressure application cylinder 42a, and the pressures of the third bending cylinder 51b, the fifth bending cylinder 51c, the fourth bending cylinder 52b and the sixth bending cylinder 52c, the thickness over the entire width of the electrode plate 2 can be controlled to the target value T t , so that the cylinder position of the first pressure application cylinder 41a becomes the corrected driving side pressure application cylinder position set value G m +ΔG m , the cylinder position of the second pressure application cylinder 42a becomes the corrected operating side pressure application cylinder position set value G s +ΔG s , the pressures of the third bending cylinder 51b and the fifth bending cylinder 51c become the corrected driving side bending pressure set value B m +ΔB m , the pressures of the fourth bending cylinder 52b and the sixth bending cylinder 52c become the corrected operating side bending pressure set value B s +ΔB s .

[0116] The first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop are supplied from the characteristic quantity calculation unit 814 to the correction value calculation unit 815. In addition, the driving side pressure application cylinder position set value G m input by the operator via the HMI, the operating side pressure application cylinder position set value Gs and the drive-side bending pressure set value B m and the operation-side bending pressure set value B s are supplied. Under standard conditions, they are in the first characteristic quantity T t－m the second characteristic quantity T t－s and the third characteristic quantity T drop All pre-derived values of zero are respectively set as the drive-side pressure cylinder position set value G m the operation-side pressure cylinder position set value G s the drive-side bending pressure set value B m and the operation-side bending pressure set value B s .

[0117] The correction value calculation unit 815 calculates the drive-side pressure cylinder position correction value ΔG based on the first characteristic quantity T t－m the second characteristic quantity T t－s the third characteristic quantity T drop and the proportionality constants of the above (Equation 16), (Equation 17), (Equation 18), and (Equation 14), and calculates the operation-side pressure cylinder position correction value ΔG m the drive-side bending pressure correction value ΔB s and the operation-side bending pressure correction value ΔB m . The correction value calculation unit 815 supplies the calculated drive-side pressure cylinder position correction value ΔGm, operation-side pressure cylinder position correction value ΔGs, drive-side bending pressure correction value ΔBm, and operation-side bending pressure correction value ΔBs to the set value correction unit 816 s .

[0118] The drive-side pressure cylinder position correction value ΔG m the operation-side pressure cylinder position correction value ΔG s the drive-side bending pressure correction value ΔB m and the operation-side bending pressure correction value ΔB s are supplied from the correction value calculation unit 815 to the set value correction unit 816. In addition, the drive-side pressure cylinder position set value G input by the operator via the HMI m the operation-side pressure cylinder position set value G s the drive-side bending pressure set value B m and the operation-side bending pressure set value B s are supplied

[0119] The set value correction unit 816 sets the drive-side pressure cylinder position set value G m the operation-side pressure cylinder position set value G s the drive-side bending pressure set value B m and the operation-side bending pressure set value B sAdd the position correction value ΔG of the driving side pressing cylinder respectively m and the position correction value ΔG of the operating side pressing cylinder s and the bending pressure correction value ΔB of the driving side m and the bending pressure correction value ΔB of the operating side s , and calculate the corrected position setting value G of the driving side pressing cylinder m +ΔG m , the corrected position setting value G of the operating side pressing cylinder s +ΔG s , the corrected bending pressure setting value B of the driving side m +ΔB m , and the corrected bending pressure setting value B of the operating side s +ΔB s .

[0120] The setting value correction unit 816 supplies the calculated corrected position setting value G of the driving side pressing cylinder m +ΔG m , the corrected position setting value G of the operating side pressing cylinder s +ΔG s to the cylinder position deviation calculation unit 817f, and supplies the corrected bending pressure setting value B of the driving side m +ΔB m , the corrected bending pressure setting value B of the operating side s +ΔB s to the bending pressure deviation calculation unit 818c.

[0121] The cylinder position deviation calculation unit 817f calculates the deviation between the corrected position setting value G of the driving side pressing cylinder supplied from the setting value correction unit 816 m +ΔG m and the measured value of the cylinder position of the first pressing cylinder 41a measured by the first magnetic scale 41c. In addition, the cylinder position deviation calculation unit 817f calculates the deviation between the corrected position setting value G of the operating side pressing cylinder supplied from the setting value correction unit 816 s +ΔG s and the measured value of the cylinder position of the second pressing cylinder 42a measured by the second magnetic scale 42c.

[0122] The cylinder position deviation calculation unit 817f supplies the calculated cylinder position deviation of the first pressing cylinder 41a and the cylinder position deviation of the second pressing cylinder 42a to the PID control unit 817e. The PID control unit 817e generates the operation amount of the pressure of the first pressing cylinder 41a and the operation amount of the pressure of the second pressing cylinder 42a based on the cylinder position deviation of the first pressing cylinder 41a and the cylinder position deviation of the second pressing cylinder 42a.

[0123] The PID control unit 817e supplies the operation amounts of the pressure of the first pressing cylinder 41a and the pressure of the second pressing cylinder 42a generated to the cylinder position control unit 817d. The cylinder position control unit 817d includes an actuator and drives the first pressing cylinder 41a and the second pressing cylinder 42a respectively based on the operation amount of the pressure of the first pressing cylinder 41a and the operation amount of the pressure of the second pressing cylinder 42a.

[0124] In feedback control example 2, as the bending mechanism, the third bending cylinder 51b, the fifth bending cylinder 51c, the fourth bending cylinder 52b, and the sixth bending cylinder 52c were controlled. However, since it is basically the same as the case of controlling the first bending cylinder 51a and the second bending cylinder 52a in feedback control example 1, the description is omitted.

[0125] In this way, in feedback control example 2, instead of performing feedback control to maintain the pressure of the pressing cylinder at the set value as in feedback control example 1, feedback control is performed to maintain the position of the pressing cylinder at the set value. The operation object is the position of the pressing cylinder. In addition, in feedback control example 2, feedback control is also performed to maintain the pressure of the bending cylinder at the set value. The operation object is the pressure of the bending cylinder. By adding a correction value calculated based on the thickness measurement value to the set value of the pressing cylinder position and the set value of the bending cylinder pressure, the thickness of the electrode plate 2 is controlled at the target value.

[0126] Figure 7 It is a diagram for explaining feedback control example 3 using the first control disk 81 and the second control disk 82. Feedback control example 3 is the control used in the roll pressing device of Embodiment 1 shown in Figure 1 In feedback control example 3, as the compression mechanism, the first electric screw 41b and the second electric screw 42b are used. In addition, a sufficiently large pressure (fixed value) is applied in advance to the first pressing cylinder 41a and the second pressing cylinder 42a through the position control of the first electric screw 41b and the second electric screw 42b so that the position of the cylinder does not change.

[0127] As the bending mechanism, the first bending cylinder 51a and the second bending cylinder 52a are used. Hereinafter, the differences from Figure 5 the feedback control example 1 shown in are described. In feedback control example 3, the pressing pressure control unit 817a, the PID control unit 817b, and the pressing pressure deviation calculation unit 817c are not provided, but the screw position control unit 817g, the PID control unit 817h, and the screw position deviation calculation unit 817i are provided.

[0128] According to the experiments of the inventors of the present invention: in the first characteristic quantity T t－m 、the second characteristic quantity T t－s 、the third characteristic quantity T drop and the driving side electric screw position Dm 、Operation side electric screw position D s 、Average electric screw position D ave = (D m + D s ) / 2, there exists a relationship defined by the following (Equation 19) to (Equation 21).

[0129] T t－m ∝ D m …… (Equation 19)

[0130] T t－s ∝ D s …… (Equation 20)

[0131] T drop ∝ -D ave …… (Equation 21)

[0132] The thickness of the electrode plate 2 does not only increase or decrease with the change of the electric screw position. It is also necessary to consider the elastic deformation amounts of the first pressing roller 11 and the second pressing roller 12 caused by the change of the reaction force from the electrode plate 2.

[0133] Drive side electric screw position D m 、Operation side electric screw position D s 、Average electric screw position D ave and the first characteristic quantity T representing the thickness of the electrode plate 2 t－m 、Second characteristic quantity T t－s 、Third characteristic quantity T drop The correlation relationship is obtained in advance through experiments.

[0134] When the preload pressure is constant, or when the preload mechanism is not provided, when the pressure difference between the drive side bending pressure B m and the operation side bending pressure B s is constant, according to the correlation relationships shown in the above (Equation 19) and (Equation 20), the drive side electric screw position correction value ΔD t－m of the drive side electric screw position D t－s and the operation side electric screw position D m at which the first characteristic quantity T s and the second characteristic quantity T are both zero can be respectively obtained. m 、And the operation side electric screw position correction value ΔD s .

[0135] According to the correlation relationship shown in the above (Equation 21), the change amount ΔT m of the third characteristic quantity T s accompanied by the correction of the drive side electric screw position D drop and the operation side electric screw position D dropBased on the correlation shown in the above (Equation 14), the average bending pressure B that makes the third characteristic quantity T drop to which the change amount ΔT is added drop +ΔT drop become zero can be obtained. ave The correction value ΔB ave .

[0136] By controlling the positions of the first electric screw 41b and the second electric screw 42b, and the pressures of the first bending cylinder 51a and the second bending cylinder 52a, the thickness across the entire width of the electrode plate 2 can be controlled to the target value T t , such that the position of the first electric screw 41b becomes the corrected drive-side electric screw position set value D m +ΔD m , the position of the second electric screw 42b becomes the corrected operation-side electric screw position set value D s +ΔD s , the pressure of the first bending cylinder 51a becomes the corrected drive-side bending pressure set value B m +ΔB m , and the pressure of the second bending cylinder 52a becomes the corrected operation-side bending pressure set value B s +ΔB s .

[0137] The first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are supplied from the characteristic quantity calculation unit 814 to the correction value calculation unit 815. In addition, the drive-side electric screw position set value D m , the operation-side electric screw position set value D s , the drive-side bending pressure set value B m , and the operation-side bending pressure set value B s input by the operator via the HMI are supplied. Under standard conditions, the values pre-derived in such a way that the first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are all zero are respectively set as the drive-side electric screw position set value D m , the operation-side electric screw position set value D s , the drive-side bending pressure set value B m , and the operation-side bending pressure set value B s .

[0138] The correction value calculation unit 815 is based on the first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity Tdrop and the proportionality constants of the above (Equation 19), (Equation 20), (Equation 21), and (Equation 14) to calculate the drive-side electric screw position correction value ΔD m and the operation-side electric screw position correction value ΔD s and the drive-side bending pressure correction value ΔB m and the operation-side bending pressure correction value ΔB s . The correction value calculation unit 815 supplies the calculated drive-side electric screw position correction value ΔD m , the operation-side electric screw position correction value ΔD s , the drive-side bending pressure correction value ΔB m , and the operation-side bending pressure correction value ΔB s to the set value correction unit 816.

[0139] The drive-side electric screw position correction value ΔD m , the operation-side electric screw position correction value ΔD s , the drive-side bending pressure correction value ΔB m , and the operation-side bending pressure correction value ΔB s are supplied from the correction value calculation unit 815 to the set value correction unit 816. In addition, the drive-side electric screw position set value D m , the operation-side electric screw position set value D s , the drive-side bending pressure set value B m , and the operation-side bending pressure set value B s input by the operator via the HMI are supplied.

[0140] The set value correction unit 816 adds the drive-side electric screw position correction value ΔD m , the operation-side electric screw position correction value ΔD s , the drive-side bending pressure correction value ΔB m , and the operation-side bending pressure correction value ΔB s to the drive-side electric screw position set value D m , the operation-side electric screw position set value D s , the drive-side bending pressure set value B m , and the operation-side bending pressure set value B s respectively to calculate the corrected drive-side electric screw position set value D m +ΔD m , the corrected operation-side electric screw position set value D s +ΔD s , the corrected drive-side bending pressure set value B m +ΔB m , and the corrected operation-side bending pressure set value B s+ΔB s 。

[0141] The set value correction unit 816 supplies the calculated corrected drive side electric screw position set value D m +ΔD m and the calculated corrected operation side electric screw position set value D s +ΔD s to the screw position deviation calculation unit 817i, and supplies the calculated corrected drive side bending pressure set value B m +ΔB m and the calculated corrected operation side bending pressure set value B s +ΔB s to the bending pressure deviation calculation unit 818c.

[0142] The screw position deviation calculation unit 817i calculates the deviation between the calculated corrected drive side electric screw position set value D m +ΔD m supplied from the set value correction unit 816 and the measured value of the position of the first electric screw 41b. In addition, the screw position deviation calculation unit 817i calculates the deviation between the calculated corrected operation side electric screw position set value D s +ΔD s supplied from the set value correction unit 816 and the measured value of the position of the second electric screw 42b.

[0143] The screw position control unit 817g includes servo motors respectively, and the servo motors are used to press down the first electric screw 41b and the second electric screw 42b. The change amount of the position of each of the first electric screw 41b and the second electric screw 42b can be calculated according to the rotation speed of its respective servo motor.

[0144] The screw position deviation calculation unit 817i supplies the calculated position deviation of the first electric screw 41b and the position deviation of the second electric screw 42b to the PID control unit 817h. The PID control unit 817h generates the operation amount of the rotation of the servo motor for the first electric screw 41b and the operation amount of the rotation of the servo motor for the second electric screw 42b based on the position deviation of the first electric screw 41b and the position deviation of the second electric screw 42b.

[0145] The PID control unit 817h supplies the generated operation amount of the rotation of the servo motor for the first electric screw 41b and the operation amount of the rotation of the servo motor for the second electric screw 42b to the screw position control unit 817g. The screw position control unit 817g drives the servo motor for the first electric screw 41b and the servo motor for the second electric screw 42b respectively based on the operation amount of the rotation of the servo motor for the first electric screw 41b and the operation amount of the rotation of the servo motor for the second electric screw 42b.

[0146] In this way, in feedback control example 3, instead of performing feedback control as in feedback control example 1 to maintain the pressure of the pressing cylinder at the set value, feedback control is performed to maintain the position of the electric screw at the set value. The controlled object is the rotational speed of the servo motor. In feedback control example 3, feedback control is also performed to maintain the pressure of the bending cylinder at the set value. The controlled object is the pressure of the bending cylinder. By adding a correction value calculated based on the thickness measurement value to the set value of the position of the electric screw and the set value of the bending cylinder pressure, the thickness of the electrode plate 2 is controlled to the target value.

[0147] Figure 8 This is a diagram for explaining feedback control example 4 using the first control panel 81 and the second control panel 82. Feedback control example 4 is the control used in the roll pressing device of Embodiment 3 shown in Figure 3 In feedback control example 4, as the compression mechanism, the first electric pin 41e and the second electric pin 42e are used. In addition, for the first pressing cylinder 41a and the second pressing cylinder 42a in advance, by controlling the height of the first electric pin 41e and the second electric pin 42e, a sufficiently large pressure (fixed value) is applied so that the position of the cylinder does not change.

[0148] As the bending mechanism, at least one of the third bending cylinder 51b and the fifth bending cylinder 51c, and at least one of the fourth bending cylinder 52b and the sixth bending cylinder 52c are used. Hereinafter, the differences from Figure 5 the feedback control example 1 shown in are described. In feedback control example 4, the pressing pressure control unit 817a, the PID control unit 817b, and the pressing pressure deviation calculation unit 817c are not provided, but instead, a pin height control unit 817j, a PID control unit 817k, and a pin height deviation calculation unit 817l are provided.

[0149] When the first electric pin 41e and the second electric pin 42e are in contact with the first pressing cylinder 41a and the second pressing cylinder 42a, and the first pressing roller 11 and the second pressing roller 12 are in contact with the electrode plate 2, a part of the pressing load of the first pressing cylinder 41a and the second pressing cylinder 42a is dispersed to the first electric pin 41e and the second electric pin 42e. Therefore, (the load acting on the electrode plate 2) is represented by (the pressing load) - (the load acting on the pins).

[0150] When the pressure of the first pressing cylinder 41a and the second pressing cylinder 42a is constant, the pressing load is constant. In this state, by changing the pin height and changing the load acting on the pins, the load acting on the electrode plate 2 can be changed. It is difficult to measure the change in the load acting on the first electric pin 41e and the second electric pin 42e caused by the change in the height of each of the first electric pin 41e and the second electric pin 42e.

[0151] According to the experiments of the inventors of the present invention, it is known that: among the first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop and the height K of the driving-side electric pin m , the height K of the operating-side electric pin s , and the average height K of the electric pin ave = (K m + K s ) / 2, there exists a relationship defined by the following (Equation 22) to (Equation 24).

[0152] T t－m ∝ K m ...... (Equation 22)

[0153] T t－s ∝ K s ...... (Equation 23)

[0154] T drop ∝ -K ave ...... (Equation 24)

[0155] The height K of the driving-side electric pin m , the height K of the operating-side electric pin s , and the average height K of the electric pin ave and the first characteristic quantity T representing the thickness of the electrode plate 2 t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop are obtained in advance through experiments for their correlation.

[0156] When the pressure difference between the driving-side bending pressure B m and the operating-side bending pressure B s is constant, according to the correlation relationships shown in the above (Equation 22) and (Equation 23), the driving-side electric pin height correction value ΔK t－m of the driving-side electric pin height K t－s and the operating-side electric pin height K m when the first characteristic quantity T s and the second characteristic quantity T are both zero, and the operating-side electric pin height correction value ΔK m and the operating-side electric pin height correction value ΔK s can be obtained respectively.

[0157] According to the correlation relationship shown in the above (Equation 24), the change amount ΔT m of the third characteristic quantity T s accompanying the correction of the driving-side electric pin height K drop and the operating-side electric pin height K drop can be obtained. According to the correlation relationship shown in the above (Equation 14), the one for adding this change amount ΔT can be obtained.drop The third characteristic quantity T drop +ΔT drop The average bending pressure B that is zero ave The correction value ΔB ave .

[0158] By controlling the heights of the first electric pin 41e and the second electric pin 42e, and the pressures of the third bending cylinder 51b, the fifth bending cylinder 51c, the fourth bending cylinder 52b, and the sixth bending cylinder 52c, the thickness across the entire width of the electrode plate 2 can be controlled to the target value T t , such that the height of the first electric pin 41e becomes the corrected drive-side electric pin height setting value K m +ΔK m , the height of the second electric pin 42e becomes the corrected operation-side electric pin height setting value K s +ΔK s , the pressures of the third bending cylinder 51b and the fifth bending cylinder 51c become the corrected drive-side bending pressure setting value B m +ΔB m , the pressures of the fourth bending cylinder 52b and the sixth bending cylinder 52c become the corrected operation-side bending pressure setting value B s +ΔB s .

[0159] The first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop are supplied from the characteristic quantity calculation unit 814 to the correction value calculation unit 815. In addition, the drive-side electric pin height setting value K m , the operation-side electric pin height setting value K s , the drive-side bending pressure setting value B m , and the operation-side bending pressure setting value B s input by the operator via the HMI are supplied. Under standard conditions, the values pre-derived in such a way that the first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are all zero are respectively set as the drive-side electric pin height setting value K m , the operation-side electric pin height setting value K s , the drive-side bending pressure setting value B m and the operation-side bending pressure setting value B s .

[0160] The correction value calculation unit 815 is based on the first characteristic quantity T t－m , the second characteristic quantity T t－s , the third characteristic quantity T drop, and the proportional constants in the above (Equation 22), (Equation 23), (Equation 24), and (Equation 14) are used to calculate the driving side electric pin height correction value ΔK m , the operating side electric pin height correction value ΔK s , the driving side bending pressure correction value ΔB m and the operating side bending pressure correction value ΔB s . The correction value calculation unit 815 supplies the calculated driving side electric pin height correction value ΔK m , the operating side electric pin height correction value ΔK s , the driving side bending pressure correction value ΔB m and the operating side bending pressure correction value ΔB s to the set value correction unit 816.

[0161] The driving side electric pin height correction value ΔK m , the operating side electric pin height correction value ΔK s , the driving side bending pressure correction value ΔB m , and the operating side bending pressure correction value ΔB s are supplied from the correction value calculation unit 815 to the set value correction unit 816. In addition, the driving side electric pin height set value K m , the operating side electric pin height set value K s , the driving side bending pressure set value B m and the operating side bending pressure set value B s input by the operator via the HMI are supplied.

[0162] The set value correction unit 816 adds the driving side electric pin height set value K m , the operating side electric pin height set value K s , the driving side bending pressure set value B m and the operating side bending pressure set value B s to the driving side electric pin height correction value ΔK m , the operating side electric pin height correction value ΔK s , the driving side bending pressure correction value ΔB m and the operating side bending pressure correction value ΔB s respectively, and calculates the corrected driving side electric pin height set value K m + ΔK m , the corrected operating side electric pin height set value K s + ΔK s , the corrected driving side bending pressure set value B m + ΔB m , and the corrected operating side bending pressure set value B s + ΔB s .

[0163] The set value correction unit 816 supplies the calculated corrected driving side electric pin height set value K m +ΔK m and the corrected operating side electric pin height set value K s +ΔK s to the pin height deviation calculation unit 817l, and supplies the corrected driving side bending pressure set value B m +ΔB m and the corrected operating side bending pressure set value B s +ΔB s to the bending pressure deviation calculation unit 818c.

[0164] The pin height deviation calculation unit 817l calculates the deviation between the corrected driving side electric pin height set value K m +ΔK m supplied from the set value correction unit 816 and the measured value of the height of the first electric pin 41e. In addition, the pin height deviation calculation unit 817l calculates the deviation between the corrected operating side electric pin height set value K s +ΔK s supplied from the set value correction unit 816 and the measured value of the height of the second electric pin 42e.

[0165] The pin height control unit 817j includes linear servo motors respectively, and the linear servo motors are used to slide the lower pins of the first electric pin 41e and the second electric pin 42e in the left-right direction. The change amount of the height of the first electric pin 41e and the second electric pin 42e can be calculated according to the moving amount of their respective linear servo motors. Alternatively, a distance meter may be provided between the first main bearing portion 21 and the third main bearing portion 23 to measure the height of the first electric pin 41e, and a distance meter may be provided between the second main bearing portion 22 and the fourth main bearing portion 24 to measure the height of the second electric pin 42e.

[0166] The pin height deviation calculation unit 817l supplies the calculated height deviation of the first electric pin 41e and the height deviation of the second electric pin 42e to the PID control unit 817k. The PID control unit 817k generates an operation amount for the movement of the linear servo motor for the first electric pin 41e and an operation amount for the movement of the linear servo motor for the second electric pin 42e based on the height deviation of the first electric pin 41e and the height deviation of the second electric pin 42e.

[0167] The PID control unit 817k supplies the operation amounts of the movement of the linear servo motors for the first electric pin 41e and the second electric pin 42e to the pin height control unit 817j. Based on the operation amount of the movement of the linear servo motor for the first electric pin 41e and the operation amount of the movement of the linear servo motor for the second electric pin 42e, the pin height control unit 817j drives the linear servo motor for the first electric pin 41e and the linear servo motor for the second electric pin 42e, respectively.

[0168] In the feedback control example 4, as the bending mechanism, the third bending cylinder 51b, the fifth bending cylinder 51c, the fourth bending cylinder 52b, and the sixth bending cylinder 52c were controlled. However, since it is basically the same as the case of controlling the first bending cylinder 51a and the second bending cylinder 52a in the feedback control example 1, the description is omitted.

[0169] In this way, in the feedback control example 4, instead of performing feedback control to maintain the pressure of the pressing cylinder at the set value as in the feedback control example 1, feedback control is performed to maintain the height of the electric pin at the set value. The operation object is the movement amount of the servo motor. In the feedback control example 4, feedback control is also performed to maintain the pressure of the bending cylinder at the set value. The operation object is the pressure of the bending cylinder. By adding a correction value calculated based on the thickness measurement value to the set value of the height of the electric pin and the set value of the pressure of the bending cylinder, the thickness of the electrode plate 2 is controlled to the target value.

[0170] When an oil cylinder is used for the above-mentioned first pressing cylinder 41a, second pressing cylinder 42a, first bending cylinder 51a, second bending cylinder 52a, third bending cylinder 51b, fourth bending cylinder 52b, fifth bending cylinder 51c, and sixth bending cylinder 52c, it is preferable to set the oil pressure control device as close as possible to the oil cylinder. In addition, as the oil pressure control device, it is preferable to use an oil pressure servo valve with a faster pressure control speed. Thereby, it is possible to prevent a delay in pressure response or pressure hunting caused by a pressure change in the oil pressure piping accompanying a change in the pressure of the oil cylinder.

[0171] However, in the methods shown in the feedback control examples 1 to 4, in which the thickness of the electrode plate 2 being conveyed is measured by the thickness gauge 70 and the thickness of the electrode plate 2 is corrected by feedback control, it is difficult to correct the thickness change during acceleration or deceleration of the conveying line with high precision. Although consideration is also given to slowing down the speed during acceleration or deceleration of the conveying line, in this case, the production efficiency will decrease. Therefore, a method is introduced that predicts the thickness change of the electrode plate 2 caused by the speed change of the conveying line and corrects the thickness of the electrode plate 2 by feedforward control.

[0172] Figure 9is a graph depicting the relationship between the change in the thickness of the electrode plate 2 and the change in the linear velocity under certain pressing and bending conditions of a certain rolling device 1. The horizontal axis represents the linear velocity [mpm], and the vertical axis represents the average thickness width of the electrode plate 2 [μm]. As Figure 9 shown, it can be seen that: the faster the linear velocity becomes, the thicker the electrode plate 2 becomes.

[0173] Figure 10 is a diagram for explaining the feedforward control example 1 using the first control disk 81. The feedforward control example 1 is a control used in the rolling device of the first embodiment Figure 1 shown. In the feedforward control example 1, as the compression mechanism, the first pressing cylinder 41a and the second pressing cylinder 42a are used. In this specification, in order to simplify the feedforward control, the bending mechanism is not used for the feedforward control.

[0174] Figure 10 depicts the function block implemented by the first control disk 81 associated with the feedforward control example 1. The first control disk 81 includes a linear velocity setting change unit 819, a linear velocity control unit 8110, a correction value calculation unit 815, a set value correction unit 816, a pressing pressure control unit 817a, a PID control unit 817b, and a pressing pressure deviation calculation unit 817c.

[0175] The linear velocity control unit 8110 controls the rotational speed of the unwinder 13, the rotational speeds of the first pressing roller 11 and the second pressing roller 12, and the rotational speed of the winder 14 based on the command value of the linear velocity supplied from the linear velocity setting change unit 819.

[0176] The linear velocity set by the operator is input to the linear velocity setting change unit 819. The acceleration during the acceleration of the conveyor line and the deceleration during the deceleration are basically preset by the manufacturer of the rolling device 1. Alternatively, it may be a specification that allows the user to change and set the acceleration during acceleration and the deceleration during deceleration.

[0177] In the feedforward control example 1, the change in the thickness of the electrode plate 2 caused by the change in the linear velocity is predicted, the pressing load required to keep the thickness of the electrode plate 2 constant is calculated, and the pressing load is changed by feedforward control. The relationship between the linear velocity and the thickness of the electrode plate 2 can accurately predict the appropriate pressing pressure through preliminary experimental investigations.

[0178] When the acceleration or deceleration of the linear velocity is denoted as α [m / s 2 , the linear velocity V after S seconds from the start of acceleration or deceleration s can be obtained using the velocity V0 at the start of acceleration or deceleration and the change amount ΔV of the linear velocity after S seconds from the start of acceleration or deceleration s, defined as follows (Equation 25). The change in linear velocity ΔV after S seconds from the start of acceleration or deceleration s can be defined as follows (Equation 26).

[0179] V s = V0 + ΔV s = V0 + α×S …… (Equation 25)

[0180] ΔV s = V s -V0 = α×S …… (Equation 26)

[0181] As Figure 9 shown, the change in linear velocity ΔV after S seconds s and the average thickness change ΔT in the width direction of the electrode plate 2 ave are in a proportional relationship, so the following relationship (Equation 27) holds. ave

[0182] ΔT ave s = D×ΔV s …… (Equation 27)

[0183] D is a proportionality constant.

[0184] Alternatively, the relationship between the change in linear velocity ΔV and the average thickness change ΔT ave can be obtained through experiments and fitted with a multivariate function, exponential function, or logarithmic function. ave

[0185] In addition, since there is a proportional relationship between the average value L ave in the width direction of the pressing load applied to the electrode plate 2 (hereinafter referred to as the line pressure) and the average thickness T ave after pressing, when the line pressure changes, the change in line pressure ΔL ave and the change in average thickness T ave ave the following relationship (Equation 28) holds between the change in ΔT ave

[0186] ΔT ave ave = E×ΔL ave …… (Equation 28)

[0187] E is a proportionality constant.

[0188] Regarding the correction value ΔL ave of the line pressure for making the change in average thickness T ave,s zero after S seconds from the start of acceleration or deceleration ave,s , ΔV can be eliminated from the relationships of the above (Equation 26), (Equation 27), and (Equation 28)s and ΔT ave , and is obtained by the following (Equation 29).

[0189] ΔL ave,s = {(D × α) / E} × S... (Equation 29)

[0190] When the wire pressure during acceleration or deceleration is denoted as L ave,0 , the wire pressure after S seconds can be made L ave,0 + ΔL ave,s by performing feedforward control on the pressing mechanism, thereby reducing the thickness change of the electrode plate 2 caused by the change in the wire speed.

[0191] In the feedforward control example 1, by setting the positions of the first electric screw 41b and the second electric screw 42b to be constant and changing the pressures of the first pressing cylinder 41a and the second pressing cylinder 42a, the pressing load acting on the electrode plate 2 is changed. The average pressing pressure P m of the driving side pressing pressure P s and the operating side pressing pressure P ave = (P m + P s ) / 2, and the change amount ΔP ave and the change amount ΔT ave of the average thickness T ave of the electrode plate 2 are in a proportional relationship. Therefore, when changing the pressing pressure, the change amount ΔP ave of the average pressing pressure P ave and the change amount ΔT ave of the average thickness T ave satisfy the following relationship (Equation 30).

[0192] ΔT ave = F × ΔP ave ... (Equation 30)

[0193] F is a proportionality constant.

[0194] Regarding the correction value ΔP ave for making the change amount ΔT ave,s of the average thickness T ave zero after S seconds from the start of acceleration or deceleration, ΔV ave,s and ΔT s can be eliminated from the relationships of the above (Equation 26), (Equation 27), and (Equation 30), and is obtained by the following (Equation 31). ave ave,s

[0195] ΔP ave,s = {(D × α) / F} × S... (Equation 31)

[0196] When the average pressing pressure during acceleration or deceleration is denoted as P ave,0 it is possible to perform feedforward control on the pressures of the first pressing cylinder 41a and the second pressing cylinder 42a so that the average pressing pressure after S seconds becomes P ave,0 +ΔP ave,s thereby suppressing the thickness change of the electrode plate 2 caused by the change in the line speed

[0197] The driving-side pressing pressure P m during the acceleration period or deceleration period of the conveyor line s and the operating-side pressing pressure P

[0198] Before the acceleration of the conveyor line starts, the acceleration start time, acceleration end time, line speed V0 at the start of acceleration, and acceleration α are supplied from the line speed setting change unit 819 to the correction value calculation unit 815. For example, when starting the roller pressing device 1 and changing the line speed during operation, these pieces of information are supplied from the line speed setting change unit 819. In addition, before the deceleration of the conveyor line starts, the deceleration start time, deceleration end time, line speed V0 at the start of deceleration, and deceleration α are supplied from the line speed setting change unit 819 to the correction value calculation unit 815

[0199] Based on the above (Equation 26), the line speed V0 at the start of acceleration, and the acceleration α, the correction value calculation unit 815 calculates the change amount ΔV of the line speed after S seconds from the start of acceleration s The correction value calculation unit 815 applies the calculated change amount ΔV of the line speed s to the above (Equation 27) to predict the change amount ΔT ave of the average thickness T ave,s after S seconds from the start of acceleration. The correction value calculation unit 815 calculates the correction value ΔP ave for making the change amount ΔT ave,s of the average thickness T ave zero based on the above (Equation 31) ave,s

[0200] In Figure 10 the example shown, the correction value calculation unit 815 calculates the correction value ΔP ave of the average pressing pressure P 0.1 at 0.1-second intervals 0.2 ΔP tend and so on, and the calculated average pressing pressure P​ave Correction value ΔP 0.1 , ΔP 0.2 , ……, ΔP tend is supplied to the set value correction unit 816.

[0201] Average pressing pressure P ave Correction value ΔP 0.1 , ΔP 0.2 , ……, ΔP tend is supplied from the correction value calculation unit 815 to the set value correction unit 816. The set value correction unit 816 adds the correction value ΔP 0.1 , ΔP 0.2 , ……, ΔP tend respectively to the pressing pressure set value P0 at the start of acceleration, and calculates the corrected pressing pressure set value P0 + ΔP 0.1 , P0 + ΔP 02 , ……, P0 + ΔP tend . The pressing pressure set value P0 at the start of acceleration is, for example, the pressing pressure set value P input by the operator via the HMI. The set value correction unit 816 supplies the calculated corrected pressing pressure set value P0 + ΔP 0.1 , P0 + ΔP 02 , ……, P0 + ΔP tend to the pressing pressure deviation calculation unit 817c.

[0202] The pressing pressure deviation calculation unit 817c calculates, at each respective moment, the deviation between the pressing pressure set value of the portion of the corrected pressing pressure set value P0 + ΔP 0.1 , P0 + ΔP 02 , ……, P0 + ΔP tend supplied from the set value correction unit 816 and allocated to the first pressing cylinder 41a and the measured pressure value of the first pressing cylinder 41a. In addition, the pressing pressure deviation calculation unit 817c calculates, at each respective moment, the deviation between the pressing pressure set value of the portion of the corrected pressing pressure set value P0 + ΔP 0.1 , P0 + ΔP 02 , ……, P0 + ΔP tend supplied from the set value correction unit 816 and allocated to the second pressing cylinder 42a and the measured pressure value of the second pressing cylinder 42a. The measured pressure value of the first pressing cylinder 41a and the measured pressure value of the second pressing cylinder 42a can be estimated respectively based on the measurement values of the valve opening meters.

[0203] The pressure deviation calculation unit 817c for the pressing pressure supplies the calculated pressure deviations of the first pressing cylinder 41a and the second pressing cylinder 42a to the PID control unit 817b. The PID control unit 817b generates an operation amount for the pressure of the first pressing cylinder 41a and an operation amount for the pressure of the second pressing cylinder 42a based on the pressure deviation of the first pressing cylinder 41a and the pressure deviation of the second pressing cylinder 42a.

[0204] The PID control unit 817b supplies the generated operation amount for the pressure of the first pressing cylinder 41a and the operation amount for the pressure of the second pressing cylinder 42a to the pressing pressure control unit 817a. The pressing pressure control unit 817a includes an actuator and drives the first pressing cylinder 41a and the second pressing cylinder 42a respectively based on the operation amount for the pressure of the first pressing cylinder 41a and the operation amount for the pressure of the second pressing cylinder 42a. In the above description, it is assumed to be during acceleration, but the control is the same during deceleration.

[0205] It is necessary to consider the delay time (time lag t e ) from the change of the pressing pressure set value to the actual position where the pressing pressure changes. Therefore, the linear velocity setting change unit 819 supplies a command value for changing the linear velocity to the linear velocity control unit 8110 at a timing delayed by a time equivalent to the time lag t e from the timing when the pressing pressure set value change is instructed to the correction value calculation unit 815. Thus, it is possible to more appropriately change the operation of the actuator with respect to the change in the linear velocity and to correct the thickness of the electrode plate 2 with high precision. In addition, as described above, for the pressure control of the first pressing cylinder 41a and the second pressing cylinder 42a, it is preferable to use an oil pressure servo valve with high responsiveness.

[0206] In this way, in the feedforward control example 1, the change in the thickness of the electrode plate 2 caused by the change in the linear velocity is predicted, the pressing pressure required to keep the thickness of the electrode plate 2 constant is calculated, and the pressing pressure is changed by feedforward control. Thus, it is possible to suppress the change in the thickness of the electrode plate 2 during the acceleration period or the deceleration period of the conveyor line with high precision.

[0207] Figure 11 FIG. is for explaining the feedforward control example 2 using the first control disk 81. The feedforward control example 2 is the control used in the roll pressing device of the embodiment 2 shown in Figure 2 In the feedforward control example 2, the first pressing cylinder 41a and the second pressing cylinder 42a are used as the compression mechanism. Hereinafter, the differences from the Figure 10 shown feedforward control example 1 will be described. In the feedforward control example 2, instead of the pressing pressure control unit 817a, the PID control unit 817b, and the pressing pressure deviation calculation unit 817c, a cylinder position control unit 817d, a PID control unit 817e, and a cylinder position deviation calculation unit 817f are provided.

[0208] In the feedforward control example 2, by setting the positions of the first electric screw 41b and the second electric screw 42b to be constant and changing the pressures of the first pressing cylinder 41a and the second pressing cylinder 42a, the pressing load acting on the electrode plate 2 is changed. The cylinder position of the first pressing cylinder 41a is measured by the first magnetic scale 41c, and the pressure of the first pressing cylinder 41a is controlled so that the cylinder position of the first pressing cylinder 41a maintains the set value. Similarly, the cylinder position of the second pressing cylinder 42a is measured by the second magnetic scale 42c, and the pressure of the second pressing cylinder 42a is controlled so that the cylinder position of the second pressing cylinder 42a maintains the set value. The driving side pressing cylinder position G m and the operating side pressing cylinder position G s of the average pressing cylinder position G ave =(G m +G s ) / 2 of the change amount ΔG ave and the average value T ave of the thickness of the electrode plate 2 of the change amount ΔT ave there is a proportional relationship between, so when changing the cylinder position, the average pressing cylinder position G ave of the change amount ΔG ave and the average value T ave of the change amount ΔT ave between, the following (Equation 32) relationship holds.

[0209] ΔT ave =G×ΔG ave ……(Equation 32)

[0210] G is a proportionality constant.

[0211] Regarding the average pressing cylinder position G ave for making the change amount ΔT ave,s of the average value T ave of the thickness zero after S seconds from the start of acceleration or deceleration, the correction value ΔG ave,s can be obtained by removing ΔV s and ΔT ave from the relationships of the above (Equation 26), (Equation 27), and (Equation 32), and can be obtained by the following (Equation 33).

[0212] ΔG ave,s ={(D×α) / G}×S……(Equation 33)

[0213] When the average pressing cylinder position during acceleration or deceleration is denoted as G ave,0 , the cylinder positions of the first pressing cylinder 41a and the second pressing cylinder 42a can be feedforward controlled so that the average pressing cylinder position after S seconds becomes G ave,0+ΔG ave,s , thereby suppressing the thickness change of the electrode plate 2 caused by the change in the linear velocity.

[0214] The position G of the driving-side pressing cylinder during the acceleration or deceleration period of the conveyor line m and the position G of the operating-side pressing cylinder s The difference can be substantially the same as before acceleration or deceleration. In addition, due to the difference in rigidity between the driving side and the operating side of the rolling device 1, when the thickness change of the electrode plate 2 caused by the change in the linear velocity is different between the driving side and the operating side, the difference during the acceleration period or the deceleration period can also be changed.

[0215] Before the acceleration of the conveyor line starts, the acceleration start time, the acceleration end time, the linear velocity V0 at the start of acceleration, and the acceleration α are supplied from the linear velocity setting change unit 819 to the correction value calculation unit 815. In addition, before the deceleration of the conveyor line starts, the deceleration start time, the deceleration end time, the linear velocity V0 at the start of deceleration, and the deceleration α are supplied from the linear velocity setting change unit 819 to the correction value calculation unit 815.

[0216] Based on the above (Equation 26), the linear velocity V0 at the start of acceleration, and the acceleration α, the correction value calculation unit 815 calculates the change amount ΔV of the linear velocity S seconds after the start of acceleration s . The correction value calculation unit 815 applies the calculated change amount ΔV of the linear velocity s to the above (Equation 27) to predict the change amount ΔT ave of the average thickness T ave,s S seconds after the start of acceleration. The correction value calculation unit 815 calculates the average pressing cylinder position G ave for making the change amount ΔT ave,s of the average thickness T ave zero ave,s .

[0217] In Figure 11 the example shown, the correction value calculation unit 815 calculates the correction value ΔG ave of the average pressing cylinder position G 0.1 at intervals of 0.1 second 0.2 , ΔG tend , ……, ΔG ave and supplies the calculated correction value ΔG 0.1 of the average pressing cylinder position G 0.2 , ΔG tend to the set value correction unit 816.

[0218] The correction value ΔG ave of the average pressing cylinder position G 0.1 , ΔG0.2 , ……, ΔG tend is supplied from the correction value calculation unit 815 to the set value correction unit 816. The set value correction unit 816 adds the correction values ΔG 0.1 , ΔG 0.2 , ……, ΔG tend to the pressure cylinder position set value G0 at the start of acceleration, and calculates the corrected pressure cylinder position set value G0 + ΔG 0.1 , G0 + ΔG 02 , ……, G0 + ΔG tend . The pressure cylinder position set value G0 at the start of acceleration is, for example, the pressure cylinder position set value G input by the operator via the HMI. The set value correction unit 816 supplies the calculated corrected pressure cylinder position set value G0 + ΔG 0.1 , G0 + ΔG 02 , ……, G0 + ΔG tend to the cylinder position deviation calculation unit 817f.

[0219] The cylinder position deviation calculation unit 817f calculates, at each respective time, the deviation between the corrected pressure cylinder position set value G0 + ΔG 0.1 , G0 + ΔG 02 , ……, G0 + ΔG tend supplied from the set value correction unit 816 and the measured value of the cylinder position of the first pressure cylinder 41a measured by the first magnetic scale 41c. In addition, the cylinder position deviation calculation unit 817f calculates, at each respective time, the deviation between the corrected pressure cylinder position set value G0 + ΔG 0.1 , G0 + ΔG 02 , ……, G0 + ΔG tend and the measured value of the cylinder position of the second pressure cylinder 42a measured by the second magnetic scale 42c.

[0220] The cylinder position deviation calculation unit 817f supplies the calculated cylinder position deviation of the first pressure cylinder 41a and the cylinder position deviation of the second pressure cylinder 42a to the PID control unit 817e. The PID control unit 817e generates the operation amount of the pressure of the first pressure cylinder 41a and the operation amount of the pressure of the second pressure cylinder 42a based on the cylinder position deviation of the first pressure cylinder 41a and the cylinder position deviation of the second pressure cylinder 42a.

[0221] The PID control unit 817e supplies the operation amounts of the pressure of the first pressing cylinder 41a and the pressure of the second pressing cylinder 42a generated to the cylinder position control unit 817d. The cylinder position control unit 817d includes an actuator and drives the first pressing cylinder 41a and the second pressing cylinder 42a based on the operation amount of the pressure of the first pressing cylinder 41a and the operation amount of the pressure of the second pressing cylinder 42a, respectively. In the above description, it is assumed to be during acceleration, but the control is the same during deceleration.

[0222] It is necessary to consider the delay time (time lag t e ) from the change of the cylinder position set value to the actual change of the cylinder position. Therefore, the linear velocity setting change unit 819 supplies the command value for the change of the linear velocity to the linear velocity control unit 8110 at a timing delayed by a time equivalent to the time lag t e from the timing when the set value of the cylinder position is changed and instructed to the correction value calculation unit 815. Thereby, it is possible to more appropriately change the operation of the actuator in response to the change of the linear velocity and to correct the thickness of the electrode plate 2 with high precision. In addition, as described above, for the pressure control of the first pressing cylinder 41a and the second pressing cylinder 42a, it is preferable to use an oil pressure servo valve with high responsiveness.

[0223] In this way, in the feedforward control example 2, the change in the thickness of the electrode plate 2 caused by the change in the linear velocity is predicted, the pressing cylinder position required to keep the thickness of the electrode plate 2 constant is calculated, and the pressing cylinder position is changed by feedforward control. Thereby, it is possible to suppress the change in the thickness of the electrode plate 2 during the acceleration period or the deceleration period of the conveyor line with high precision.

[0224] Figure 12 FIG. is for explaining the feedforward control example 3 using the first control disk 81. The feedforward control example 3 is the control used in the roll pressing device of the first embodiment shown in Figure 1 . In the feedforward control example 3, as the compression mechanism, the first electric screw 41b and the second electric screw 42b are used. Hereinafter, the differences from the feedforward control example 1 shown in Figure 10 will be described. In the feedforward control example 3, instead of providing the pressing pressure control unit 817a, the PID control unit 817b, and the pressing pressure deviation calculation unit 817c, a screw position control unit 817g, a PID control unit 817h, and a screw position deviation calculation unit 817i are provided.

[0225] In the feedforward control example 3, for the first pressing cylinder 41a and the second pressing cylinder 42a in advance, by changing the positions of the first electric screw 41b and the second electric screw 42b, a sufficiently large pressure (fixed value) is applied so that the cylinder positions do not change. In this state, by changing the positions of the first electric screw 41b and the second electric screw 42b, the pressing load acting on the electrode plate 2 is changed. The positions of the first electric screw 41b and the second electric screw 42b are controlled by a servo motor. The driving side electric screw position D m and the operating side electric screw position D s of the average electric screw position D ave =(D m +D s ) / 2 of the change amount ΔD ave and the average value T ave of the thickness of the electrode plate 2 of the change amount ΔT ave There is a proportional relationship between them. Therefore, when changing the electric screw position, the change amount ΔD ave of the average electric screw position D ave and the average value T ave of the thickness of the change amount ΔT ave Between them, the following relationship of (Equation 34) holds.

[0226] ΔT ave =H×ΔD ave ……(Equation 34)

[0227] H is a proportionality constant.

[0228] For making the change amount ΔT ave of the average value T ave,s of the thickness zero after S seconds from the start of acceleration or deceleration of the average electric screw position D ave of the correction value ΔD ave,s Can be removed from the relationships of the above (Equation 26), (Equation 27), (Equation 34) ΔV s And ΔT ave , and can be obtained by the following (Equation 35).

[0229] ΔD ave,s ={(D×α) / H}×S……(Equation 35)

[0230] When the average electric screw position during acceleration or deceleration is denoted as D ave,0 , by performing feedforward control on the positions of the first electric screw 41b and the second electric screw 42b, the average electric screw position after S seconds can be made D ave,0 +ΔD ave,s , thereby suppressing the thickness change of the electrode plate 2 caused by the change in the linear velocity.

[0231] The driving-side electric screw position D during the acceleration or deceleration period of the conveyor line m and the operating-side electric screw position D s The difference therebetween may be substantially the same as before the acceleration or deceleration. In addition, due to the difference in rigidity between the driving side and the operating side of the rolling device 1, when the thickness change of the electrode plate 2 caused by the change in the linear velocity is different between the driving side and the operating side, the difference during the acceleration or deceleration period can also be changed.

[0232] Before the acceleration of the conveyor line starts, the acceleration start time, the acceleration end time, the linear velocity V0 at the start of acceleration, and the acceleration α are supplied from the linear velocity setting change unit 819 to the correction value calculation unit 815. In addition, before the deceleration of the conveyor line starts, the deceleration start time, the deceleration end time, the linear velocity V0 at the start of deceleration, and the deceleration α are supplied from the linear velocity setting change unit 819 to the correction value calculation unit 815.

[0233] The correction value calculation unit 815 calculates the change amount ΔV of the linear velocity S seconds after the start of acceleration based on the above (Equation 26), the linear velocity V0 at the start of acceleration, and the acceleration α s . The correction value calculation unit 815 applies the calculated change amount ΔV of the linear velocity s to the above (Equation 27) to predict the change amount ΔT ave of the average thickness T ave,s S seconds after the start of acceleration. The correction value calculation unit 815 calculates the correction value ΔD ave of the average electric screw position D ave,s for making the change amount ΔT ave of the average thickness T ave,s zero based on the above (Equation 35).

[0234] In Figure 12 the example shown, the correction value calculation unit 815 calculates the correction value ΔD ave of the average electric screw position D 0.1 at 0.1-second intervals, ΔD 0.2 , ……, ΔD tend , and supplies the calculated correction value ΔD ave of the average electric screw position D 0.1 , ΔD 0.2 , ……, ΔD tend to the set value correction unit 816.

[0235] The correction value ΔD ave of the average electric screw position D 0.1 , ΔD 0.2 , ……, ΔD tendIt is supplied from the correction value calculation unit 815 to the set value correction unit 816. The set value correction unit 816 adds the correction values ΔD 0.1 , ΔD 0.2 , ……, ΔD tend to the electric screw position set value D0 at the start of acceleration, and calculates the corrected electric screw position set values D0 + ΔD 0.1 , D0 + ΔD 02 , ……, D0 + ΔD tend . The electric screw position set value D0 at the start of acceleration is, for example, the electric screw position set value D input by the operator via the HMI. The set value correction unit 816 supplies the calculated corrected electric screw position set values D0 + ΔD 0.1 , D0 + ΔD 02 , ……, D0 + ΔD tend to the screw position deviation calculation unit 817i.

[0236] The screw position deviation calculation unit 817i calculates, at respective times, the deviations between the corrected electric screw position set values D0 + ΔD 0.1 , D0 + ΔD 02 , ……, D0 + ΔD tend supplied from the set value correction unit 816 and the measured values of the positions of the first electric screw 41b. In addition, the screw position deviation calculation unit 817i calculates, at respective times, the deviations between the corrected electric screw position set values D0 + ΔD 0.1 , D0 + ΔD 02 , ……, D0 + ΔD tend supplied from the set value correction unit 816 and the measured values of the positions of the second electric screw 42b.

[0237] The screw position control unit 817g respectively includes servo motors for pressing down the first electric screw 41b and the second electric screw 42b. The change amounts of the positions of the first electric screw 41b and the second electric screw 42b can be calculated based on the rotation speeds of their respective servo motors.

[0238] The screw position deviation calculation unit 817i supplies the calculated position deviations of the first electric screw 41b and the second electric screw 42b to the PID control unit 817h. The PID control unit 817h generates the operation amounts of the rotation of the servo motor for the first electric screw 41b and the operation amounts of the rotation of the servo motor for the second electric screw 42b based on the position deviations of the first electric screw 41b and the second electric screw 42b.

[0239] The PID control unit 817h supplies the operation amount of the rotation of the servo motor for the first electric screw 41b and the operation amount of the rotation of the servo motor for the second electric screw 42b to the screw position control unit 817g. Based on the operation amount of the rotation of the servo motor for the first electric screw 41b and the operation amount of the rotation of the servo motor for the second electric screw 42b, the screw position control unit 817g drives the servo motor for the first electric screw 41b and the servo motor for the second electric screw 42b, respectively. In the above description, it is assumed to be during acceleration, but the control is the same during deceleration.

[0240] It is necessary to consider the delay time (time lag t e ) from the change of the electric screw position set value to the actual change of the electric screw position. Therefore, the linear velocity setting change unit 819 supplies the command value of the linear velocity change to the linear velocity control unit 8110 at a timing delayed by the time equivalent to the time lag t e from the timing when the set value of the electric screw position is changed and indicated to the correction value calculation unit 815. Thereby, it is possible to change the operation of the servo motor more appropriately with respect to the change of the linear velocity, and it is possible to correct the thickness of the electrode plate 2 with high precision.

[0241] In this way, in the feedforward control example 3, the change in the thickness of the electrode plate 2 caused by the change in the linear velocity is predicted, the electric screw position required to keep the thickness of the electrode plate 2 constant is calculated, and the electric screw position is changed by feedforward control. Thereby, it is possible to suppress the change in the thickness of the electrode plate 2 during the acceleration period or the deceleration period of the conveyor line with high precision.

[0242] As described above, according to the feedback control examples 1 to 4 using the rolling device 1 of the first to third embodiments, based on the drive side thickness measurement value T m , the center thickness measurement value T c , the operation side thickness measurement value T s and the thickness target value T t , the first characteristic quantity T t－m , the second characteristic quantity T t－s , and the third characteristic quantity T drop are calculated, and the compression mechanism and / or the bending mechanism are controlled so that the first characteristic quantity T t－m , the second characteristic quantity T t－s and the third characteristic quantity T drop are all zero. As the compression mechanism, a pressing mechanism or a pin mechanism can be used. Thereby, it is possible to make the thickness of the electrode plate 2 after compression processing converge to the target value T t over the entire width.

[0243] In the above-mentioned Patent Document 1 (Japanese Patent Application Laid-Open No. 2013-111647), a method is disclosed in which the thickness after compression is measured at three locations: the operation side, the central part, and the drive side. When the difference between these thickness measurement values and the target thickness deviates from a preset threshold value, the pressing mechanism and the bending mechanism are controlled to bring them within the threshold value. In this method, before exceeding the threshold value, film thickness control is not activated, so thickness accuracy above the threshold value cannot be obtained, and it sometimes takes time to converge near the target thickness or fails to converge near the target thickness.

[0244] In addition, in the above method, the drive-side thickness, the operation-side thickness, and the target thickness are compared. When at least one of the drive-side thickness and the operation-side thickness exceeds the threshold value, the position of the pressing cylinder is reset for correction. In order to maintain the flexure correction amount that changes due to the change in the position of the pressing cylinder, the pressure of the bending cylinder is calculated and set. When both the drive-side thickness and the operation-side thickness do not exceed the threshold value, the central part thickness is compared with the threshold value. When it exceeds the threshold value, the roll deformation of the central part is made larger, and only the pressure of the bending cylinder is changed, and the position of the pressing cylinder does not change. These control processes are repeatedly executed.

[0245] Generally, the change in the pressure of the bending cylinder acts in the direction of opening the roll gap, and in order to change the rolling load on the material to be rolled, there is a thickness change. Therefore, in any order in the above control process, the film thickness changes due to the change in the pressure of the bending cylinder, deviates from the threshold value again, and the following situation occurs: it takes time before reaching near the target thickness, or it cannot be controlled within the threshold value. In particular, the narrower the threshold value is, or the more the position of the pressing cylinder or the pressure of the bending cylinder needs to be greatly changed, the higher the possibility of deviating from the threshold value again, so there are limits to the controllable thickness range and control speed.

[0246] In addition, as described above, when comparing the drive-side thickness, the operation-side thickness, and the target thickness, and when both the drive-side thickness and the operation-side thickness do not exceed the threshold value, the central part thickness is compared with the threshold value. When it exceeds the threshold value, it is determined that the roll flexure is large, and only the pressure of the bending cylinder is changed. In this case, in order to control the central thickness starting from controlling the thicknesses at both ends below the threshold value, it takes time before converging to the target thickness. Furthermore, during the process of controlling the thicknesses at both ends, there is a possibility that the central thickness deviates from the target thickness. For example, when the central thickness is thicker than the target thickness and the thicknesses at both ends are thinner than the target thickness respectively, control is performed to make the thicknesses at both ends the target thickness and reduce the loads on both sides. However, since the pressure from the pressing roll acting on the central part of the electrode plate also decreases, the central thickness becomes thicker and deviates from the target value.

[0247] In contrast, according to feedback control examples 1 to 4 using the rolling device 1 of Embodiments 1 to 3, while judging the magnitude and direction of roll deflection based on the difference between the central thickness and the average of the thicknesses at both ends (the third characteristic quantity T drop ), and controlling the thicknesses at both ends, the central - end thickness difference caused by roll deflection is simultaneously controlled. Thereby, it is possible to converge the thickness of the electrode plate 2 to the target value faster and over the entire width without deteriorating the thickness in the width direction.

[0248] In this way, according to feedback control examples 1 to 4 using the rolling device 1 of Embodiments 1 to 3, by performing feedback control, the thickness of the electrode plate 2 after compression processing is always converged to the target value T t , thereby maintaining the thickness of the electrode plate 2 in a good state all the time. In addition, since the thickness of the electrode plate 2 is automatically controlled to the target value T t , the operator does not need to periodically stop the line, measure the thickness of the electrode plate 2 with a micrometer, and adjust the pressure value of the compression mechanism and / or the bending mechanism based on the measured value. Therefore, it is possible to suppress labor costs without deploying skilled operators. In addition, quality fluctuations caused by the operator can be suppressed.

[0249] In addition, according to feedback control examples 1 to 4 using the rolling device 1 of Embodiments 1 to 3, in order to prevent the correction of the set value from being performed based on the thickness measurement value before the reflection of the correction of the set value, after performing the correction of the set value, when the length of the electrode plate 2 reaches the pass line length L from the pressing position to the thickness gauge 70 t , and after the time t until the correction of the set value is reflected in the thickness measurement value d , the thickness measurement value is obtained. Three characteristic quantities are calculated based on the obtained thickness measurement value, a correction value is calculated based on the three characteristic quantities, and the next set value change is performed.

[0250] In the coating process or the drying process of the pre - pressing process, due to changes in the coating thickness or coating hardness of the material to be rolled, or the thermal influence of the pressure roller or the main bearing part, the thickness of the material to be rolled after pressing sometimes changes. In this case, it is also possible to repeatedly and continuously perform the above - mentioned control, so that after the thickness gauge 70 just detects the thickness change, the thickness of the material to be rolled after pressing is controlled to the target value T over the entire width t , and thus a good thickness can be obtained over the entire length.

[0251] Furthermore, by using Feedforward Control Examples 1 to 3 in combination, it is possible to highly accurately suppress the thickness change of the electrode plate 2 during the acceleration or deceleration of the conveyor line. That is, it is possible to predict the thickness change of the electrode plate 2 caused by the change in the linear velocity, calculate the compression conditions for making the predicted thickness change zero, and perform feedforward control on the compression mechanism, thereby highly accurately suppressing the thickness change caused by the change in the linear velocity.

[0252] The above proportional constants vary depending on the type of the material to be rolled, and it is preferable to measure the proportional constants in advance for each type.

[0253] The present disclosure has been described based on the embodiments. Those skilled in the art should understand that the embodiments are merely illustrative, and various modification examples can exist in the combination of their respective constituent elements or respective processing procedures, and such modification examples are also within the scope of the present disclosure.

[0254] In Figure 3 the control device 80 has been described by taking an example of being composed of two control disks, namely the first control disk 81 and the second control disk 82, but it may also be composed of one control disk obtained by integrating the first control disk 81 and the second control disk 82.

[0255] In addition, in the above-described Embodiments 1 to 3, the compression mechanism and / or the bending mechanism are controlled such that the first characteristic quantity T t－m the second characteristic quantity T t－s and the third characteristic quantity T drop are all zero. The third characteristic quantity T drop being zero and the difference between the drive-side thickness measurement value T m and the operation-side thickness measurement value T s also being zero is a state where the electrode plate 2 is flat in the width direction. Regarding this point, in the case of manufacturing an electrode plate 2 with both edges thicker than the center, the compression mechanism and / or the bending mechanism are controlled such that the third characteristic quantity T drop becomes a negative value corresponding to the thickness difference between the edge and the center. In addition, in the case of manufacturing an electrode plate 2 with both edges thinner than the center, the compression mechanism and / or the bending mechanism are controlled such that the third characteristic quantity T drop becomes a positive value corresponding to the thickness difference between the edge and the center.

[0256] That is, it is possible to manufacture an electrode plate 2 with an arbitrary thickness profile by arbitrarily setting β, γ, and δ in the following (Equation 35) to (Equation 37).

[0257] T t－m + β = 0... (Equation 35)

[0258] T t－s + γ = 0... (Equation 36)

[0259] T drop +δ = 0 …… (Equation 37)

[0260] β, γ, and δ are arbitrary real numbers [μm].

[0261] In the above-described Embodiments 1 to 3, the third characteristic quantity representing the quadratic component of the thickness profile of the electrode plate is defined as the central thickness measurement value T c and the drive-side thickness measurement value T m and the operation-side thickness measurement value T s is the difference from the average value. In this regard, it can also be defined based on a quadratic or quartic approximation curve, which is derived by the least squares method based on thickness measurement values at three or more points. When approximating with a quadratic curve, the characteristic quantity calculation unit 814 sets the quadratic coefficient of the approximate quadratic curve as the third characteristic quantity. When approximating with a quartic curve, the characteristic quantity calculation unit 814 sets the quadratic coefficient of the approximate quartic curve as the third characteristic quantity. In general, the more the number of sample points, the higher the approximation accuracy. In addition, when it is a function of quadratic or higher degree, the quadratic coefficient can be derived.

[0262] In addition, when thickness measurement values at five or more points are obtained, the first characteristic quantity T t－m is defined as the deviation between the thickness target value T t and the thickness measurement value T m of the point closest to the drive side among the five or more points, and the second characteristic quantity T t－s is defined as the deviation between the thickness target value T t and the thickness measurement value T s of the point closest to the operation side among the five or more points.

[0263] In addition, it may be that the embodiment is determined by the following items.

[0264] [Item 1]

[0265] A rolling device (1) comprising:[

[0266] A first pressing roller (11) and a second pressing roller (12) that roll by sandwiching an electrode plate (2) of a secondary battery that is continuously conveyed,[

[0267] A first main bearing portion (21) and a second main bearing portion (22) that are respectively provided on one side and the other side of the rotation axis of the first pressing roller (11) and rotatably support the rotation axis,[

[0268] The third main bearing portion (23) and the fourth bending bearing portion (34) are respectively provided on one side and the other side of the rotating shaft of the second pressing roller (12), and rotatably support the rotating shaft.

[0269] The first bending bearing portion (31) and the second bending bearing portion (32) are respectively provided on one side and the other side of the rotating shaft of the first pressing roller (11), and rotatably support the rotating shaft.

[0270] The third bending bearing portion (33) and the fourth bending bearing portion (34) are respectively provided on one side and the other side of the rotating shaft of the second pressing roller (12), and rotatably support the rotating shaft.

[0271] The first compression mechanism (41) is capable of applying a load to at least one of the first main bearing portion (21) and the third main bearing portion (23) in a direction approaching the first pressing roller (11) and the second pressing roller (12).

[0272] The second compression mechanism (42) is capable of applying a load to at least one of the second main bearing portion (22) and the fourth bending bearing portion (34) in a direction approaching the first pressing roller (11) and the second pressing roller (12).

[0273] The first bending mechanism (51) is capable of applying a load to at least one of the first bending bearing portion (31) and the third bending bearing portion (33) in a direction of separating / contacting the first pressing roller (11) and the second pressing roller (12).

[0274] The second bending mechanism (52) is capable of applying a load to at least one of the second bending bearing portion (32) and the fourth bending bearing portion (34) in a direction of separating / contacting the first pressing roller (11) and the second pressing roller (12).

[0275] The thickness gauge (70) is provided on the outlet side of the first pressing roller (11) and the second pressing roller (12), and detects the thickness of the electrode plate (2) of the secondary battery at three or more points along the width direction of the electrode plate (2).

[0276] The calculation unit (814 - 816) calculates the set values of the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52) based on the thickness measurement values at three or more points based on the detection values of the thickness gauge (70) and the thickness target value, and

[0277] Control units (817, 818) that control the loads of the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52) respectively based on the set values calculated by the above-mentioned calculation units (814 - 816);

[0278] The above-mentioned calculation units (814 - 816) calculate three characteristic quantities: the first deviation between the target thickness value and the thickness measurement value of the point closest to the first compression mechanism (41) among the three or more points, the second deviation between the target thickness value and the thickness measurement value of the point closest to the second compression mechanism (42) among the three or more points, and the second-order component of the thickness profile of the electrode plate (2). And based on these three characteristic quantities, appropriately change the set values of the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52).

[0279] Accordingly, the thickness control of the electrode plate (2) based on the rolling device (1) can be made highly accurate.

[0280] [Item 2]

[0281] The rolling device (1) as described in Item 1, wherein,

[0282] The above-mentioned thickness gauge (70) is provided on the outlet side of the first pressure roller (11) and the second pressure roller (12), and detects the thickness of the electrode plate (2) of the secondary battery at the first location, the second location, and the third location arranged along the width direction of the electrode plate (2) respectively;

[0283] The above-mentioned calculation units (814 - 816) calculate the set values of the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52) based on the first location thickness measurement value, the second location thickness measurement value, the third location thickness measurement value, and the target thickness value based on the detection values of the above-mentioned thickness gauge (70);

[0284] The above-mentioned first location is set at the end of the electrode plate (2) of the secondary battery on the side where the first compression mechanism (41) is provided;

[0285] The above-mentioned second location is set at the central part of the electrode plate (2) of the secondary battery;

[0286] The above-mentioned third location is set at the end of the electrode plate (2) of the secondary battery on the side where the second compression mechanism (42) is provided;

[0287] The above calculation units (814 to 816) calculate three characteristic quantities: a first deviation between the thickness measurement value at the first location and the thickness target value, a second deviation between the thickness measurement value at the first location and the thickness target value, and a second component of the thickness profile of the electrode plate (2) based on the thickness measurement value at the first location, the thickness measurement value at the second location, the thickness measurement value at the third location, and the thickness target value;

[0288] The second component of the thickness profile of the electrode plate (2) is defined as the difference between the thickness measurement value at the second location and the average value of the thickness measurement values at the first location and the third location.

[0289] Accordingly, the thickness in the width direction of the electrode plate (2) can be accurately profiled by the three characteristic quantities calculated based on the thickness measurement values at three locations.

[0290] [Item 3]

[0291] The roll pressing device (1) according to Item 1 or 2, wherein

[0292] Based on the relationship between the loads generated by the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52) and the three characteristic quantities derived in advance, the calculation units (814 to 816) calculate the set values of the first compression mechanism (41), the second compression mechanism (42), the first bending mechanism (51), and the second bending mechanism (52) such that all three characteristic quantities are zero.

[0293] Accordingly, the thickness change of the electrode plate (2) can be accurately suppressed by feedback control using the three characteristic quantities.

[0294] [Item 4]

[0295] The roll pressing device (1) according to Item 3, wherein

[0296] The first compression mechanism (41) includes a first pressing cylinder (41a);

[0297] The second compression mechanism (42) includes a second pressing cylinder (42a);

[0298] The first bending mechanism (51) includes a first bending cylinder (51a or 51b, 51c);

[0299] The second bending mechanism (52) includes a second bending cylinder (52a or 52b, 52c);

[0300] The above calculation units (814 to 816) calculate the set values of the pressure of the first pressing cylinder (41a), the pressure of the second pressing cylinder (42a), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) in such a manner that the above three characteristic quantities are all zero.

[0301] Accordingly, by performing feedback control on the pressure of the first pressing cylinder (41a), the pressure of the second pressing cylinder (42a), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) using the three characteristic quantities, it is possible to highly accurately suppress the thickness change of the electrode plate (2).

[0302] [Item 5]

[0303] The roll pressing device (1) as described in Item 3, wherein

[0304] The above first compression mechanism (41) includes the first pressing cylinder (41a);

[0305] The above second compression mechanism (42) includes the second pressing cylinder (42a);

[0306] The above first bending mechanism (51) includes the first bending cylinder (51a or 51b, 51c);

[0307] The above second bending mechanism (52) includes the second bending cylinder (52a or 52b, 52c);

[0308] The above calculation units (814 to 816) calculate the set values of the position of the first pressing cylinder (41a), the position of the second pressing cylinder (42a), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) in such a manner that the above three characteristic quantities are all zero.

[0309] Accordingly, by performing feedback control on the position of the first pressing cylinder (41a), the position of the second pressing cylinder (42a), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) using the three characteristic quantities, it is possible to highly accurately suppress the thickness change of the electrode plate (2).

[0310] [Item 6]

[0311] The roll pressing device (1) as described in Item 5, wherein

[0312] The above-described first compression mechanism (41) further includes a first magnetic scale (41c) for measuring the position of the first pressing cylinder (41a).

[0313] The above-described second compression mechanism (42) further includes a second magnetic scale (42c) for measuring the position of the second pressing cylinder (42a).

[0314] The above-described control unit (817d, 818)

[0315] controls the pressure of the first pressing cylinder (41a) such that the position of the first pressing cylinder (41a) measured by the first magnetic scale (41c) is consistent with the position of the first pressing cylinder (41a) supplied from the above-described calculation unit (814 to 816).

[0316] And it controls the pressure of the second pressing cylinder (42a) such that the position of the second pressing cylinder (42a) measured by the second magnetic scale (42c) is consistent with the position of the second pressing cylinder (42a) supplied from the above-described calculation unit (814 to 816).

[0317] Accordingly, the positions of the first pressing cylinder (41a) and the second pressing cylinder (42a) can be measured with high precision by the first magnetic scale (41c) and the second magnetic scale (42c), and thus feedback control of a compression mechanism with high responsiveness can be achieved.

[0318] [Item 7]

[0319] In the roll pressing device (1) as described in Item 3,

[0320] the above-described first compression mechanism (41) includes a first electric screw (41b);

[0321] the above-described second compression mechanism (42) includes a second electric screw (42b);

[0322] the above-described first bending mechanism (51) includes a first bending cylinder (51a or 51b, 51c);

[0323] the above-described second bending mechanism (52) includes a second bending cylinder (52a or 52b, 52c);

[0324] The above calculation units (814 to 816) calculate the set values of the position of the first electric screw (41b), the position of the second electric screw (42b), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) in such a manner that the above three characteristic quantities are all zero.

[0325] Accordingly, by performing feedback control on the position of the first electric screw (41b), the position of the second electric screw (42b), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) using the three characteristic quantities, it is possible to highly accurately suppress the thickness change of the electrode plate (2).

[0326] [Item 8]

[0327] The roll pressing device (1) as described in Item 3, wherein

[0328] The first compression mechanism (41) includes a first electric pin (41e);

[0329] The second compression mechanism (42) includes a second electric pin (42e);

[0330] The first bending mechanism (51) includes a first bending cylinder (51a or 51b, 51c);

[0331] The second bending mechanism (52) includes a second bending cylinder (52a or 52b, 52c);

[0332] The above calculation units (814 to 816) calculate the set values of the height of the first electric pin (41e), the height of the second electric pin (42e), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) in such a manner that the above three characteristic quantities are all zero.

[0333] Accordingly, by performing feedback control on the height of the first electric pin (41e), the height of the second electric pin (42e), the pressure of the first bending cylinder (51a or 51b, 51c), and the pressure of the second bending cylinder (52a or 52b, 52c) using the three characteristic quantities, it is possible to highly accurately suppress the thickness change of the electrode plate (2).

[0334] [Item 9]

[0335] The roll pressing device (1) according to any one of Items 1 to 8, wherein

[0336] The above thickness gauge (70) scans one thickness detection sensor in the width direction of the above electrode plate (2), continuously detects the thickness of the above electrode plate (2), and extracts the thickness detection values at three or more points.

[0337] Accordingly, the number of thickness detection sensors can be reduced.

[0338] [Item 10]

[0339] The roll pressing device (1) according to any one of Items 1 to 8, wherein

[0340] The above thickness gauge (70) detects the thickness at three or more points respectively with three or more thickness detection sensors.

[0341] Accordingly, the control of each thickness detection sensor can be simplified.

[0342] [Item 11]

[0343] The roll pressing device (1) according to Item 9 or 10, wherein

[0344] It further includes a thickness measurement value calculation unit (821), and the thickness measurement value calculation unit (821) filters three or more thickness detection values detected by the above thickness gauge (70) respectively in the length direction of the above electrode plate (2), and calculates the thickness measurement values at three or more points.

[0345] Accordingly, the noise of the detection values can be removed.

[0346] [Item 12]

[0347] The roll pressing device (1) according to any one of Items 1 to 8, wherein

[0348] After the above calculation units (814 - 816) change the set values of the above first compression mechanism (41), the above second compression mechanism (42), the above first bending mechanism (51), and the above second bending mechanism (52), before satisfying the predetermined conditions related to the line length of the pass from the pressing position to the above thickness gauge (70) and the time until the change of the above set value is reflected in the actual output, the change of the set values of the next above first compression mechanism (41), the above second compression mechanism (42), the above first bending mechanism (51), and the above second bending mechanism (52) is retained.

[0349] Accordingly, useless or excessive changes in the set values of the compression mechanism and / or the bending mechanism can be avoided.

[0350] [Item 13]

[0351] A control device (80) used in a roll pressing device (1);

[0352] The roll pressing device (1) includes:

[0353] A first pressing roll (11) and a second pressing roll (12) which perform rolling by sandwiching an electrode plate (2) of a secondary battery that is continuously conveyed,

[0354] A first main bearing portion (21) and a second main bearing portion (22) which are respectively provided on one side and the other side of the rotating shaft of the first pressing roll (11) and rotatably support the rotating shaft,

[0355] A third main bearing portion (23) and a fourth bending bearing portion (34) which are respectively provided on one side and the other side of the rotating shaft of the second pressing roll (12) and rotatably support the rotating shaft,

[0356] A first bending bearing portion (31) and a second bending bearing portion (32) which are respectively provided on one side and the other side of the rotating shaft of the first pressing roll (11) and rotatably support the rotating shaft,

[0357] A third bending bearing portion (33) and a fourth bending bearing portion (34) which are respectively provided on one side and the other side of the rotating shaft of the second pressing roll (12) and rotatably support the rotating shaft,

[0358] A first compression mechanism (41) which can apply a load in a direction approaching the first pressing roll (11) and the second pressing roll (12) to at least one of the first main bearing portion (21) and the third main bearing portion (23),

[0359] A second compression mechanism (42) which can apply a load in a direction approaching the first pressing roll (11) and the second pressing roll (12) to at least one of the second main bearing portion (22) and the fourth bending bearing portion (34),

[0360] A first bending mechanism (51) which can apply a load in a direction of separating / contacting the first pressing roll (11) and the second pressing roll (12) to at least one of the first bending bearing portion (31) and the third bending bearing portion (33),

[0361] A second bending mechanism (52) which can apply a load in a direction of separating / contacting the first pressing roll (11) and the second pressing roll (12) to at least one of the second bending bearing portion (32) and the fourth bending bearing portion (34), and

[0362] A thickness gauge (70) is provided on the outlet side of the above-mentioned first pressing roller (11) and second pressing roller (12), and measures the thickness of the electrode plate (2) of the secondary battery at three or more points along the width direction of the electrode plate (2);

[0363] The control device (80) includes:

[0364] A calculation unit (814 - 816) that calculates the set values of the above-mentioned first compression mechanism (41), above-mentioned second compression mechanism (42), above-mentioned first bending mechanism (51), and above-mentioned second bending mechanism (52) based on the thickness measurement values at three or more points based on the detection values of the above-mentioned thickness gauge (70) and the thickness target value, and

[0365] A control unit (817, 818) that controls the loads of the above-mentioned first compression mechanism (41), above-mentioned second compression mechanism (42), above-mentioned first bending mechanism (51), and above-mentioned second bending mechanism (52) respectively based on the set values calculated by the above-mentioned calculation unit (814 - 816);

[0366] The above-mentioned calculation unit (814 - 816) calculates three characteristic quantities: the first deviation between the thickness target value and the thickness measurement value of the point closest to the above-mentioned first compression mechanism (41) among the three or more points, the second deviation between the thickness target value and the thickness measurement value of the point closest to the above-mentioned second compression mechanism (42) among the three or more points, and the second - order component of the thickness profile of the above-mentioned electrode plate (2), and appropriately changes the set values of the above-mentioned first compression mechanism (41), above-mentioned second compression mechanism (42), above-mentioned first bending mechanism (51), and above-mentioned second bending mechanism (52) based on the three characteristic quantities.

[0367] Accordingly, the thickness control of the electrode plate (2) based on the rolling device (1) can be made highly accurate.

[0368] [Explanation of Reference Numerals]

[0369] 1 Rolling device

[0370] 2 Electrode plate

[0371] 11 First pressing roller

[0372] 12 Second pressing roller

[0373] 13 Unwinder

[0374] 14 Reel

[0375] 15 Motor

[0376] 16 Pulse generator

[0377] 21 - 24 Main bearing parts

[0378] 31 - 34 Bending bearing part

[0379] 41 First compression mechanism

[0380] 42 Second compression mechanism

[0381] 41a First pressure cylinder

[0382] 41b First electric screw

[0383] 41c First magnetic scale

[0384] 41d First load cell

[0385] 41e First electric pin

[0386] 42a Second pressure cylinder

[0387] 42b Second electric screw

[0388] 42c Second magnetic scale

[0389] 42d Second load cell

[0390] 42e Second electric pin

[0391] 51 First bending mechanism

[0392] 51a First bending cylinder

[0393] 51b Third bending cylinder

[0394] 51c Fifth bending cylinder

[0395] 52a Second bending cylinder

[0396] 52b Fourth bending cylinder

[0397] 52c Sixth bending cylinder

[0398] 52 Second bending mechanism

[0399] 61 First preloading mechanism

[0400] 61a First preloading cylinder

[0401] 62 Second preloading mechanism

[0402] 62a Second preloading cylinder

[0403] 70 Thickness gauge

[0404] 80 Control device

[0405] 81 First control panel

[0406] 811 Length measurement unit

[0407] 812 Acquisition timing generation unit

[0408] 813 Thickness measurement value acquisition unit

[0409] 814 Feature quantity calculation unit

[0410] 815 Correction value calculation unit

[0411] 816 Set value correction unit

[0412] 817a Pressing pressure control unit

[0413] 817b PID control unit

[0414] 817c Pressing pressure deviation calculation unit

[0415] 817d Cylinder position control unit

[0416] 817e PID control unit

[0417] 817f Cylinder position deviation calculation unit

[0418] 817g Screw position control unit

[0419] 817h PID control unit

[0420] 817i Screw position deviation calculation unit

[0421] 817j Pin height control unit

[0422] 817k PID control unit

[0423] 817l Pin height deviation calculation unit

[0424] 818a Bending pressure control unit

[0425] 818b PID control unit

[0426] 818c Bending pressure deviation calculation unit

[0427] 819 Linear velocity setting change unit

[0428] 8110 Linear velocity control unit.

Claims

1. A rolling device, comprising: A first pressing roller and a second pressing roller, which perform rolling by sandwiching the electrode plates of a secondary battery that are continuously conveyed; A first main bearing portion and a second main bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the first pressing roller and rotatably support the rotating shaft; A third main bearing portion and a fourth main bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the second pressing roller and rotatably support the rotating shaft; A first bending bearing portion and a second bending bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the first pressing roller and rotatably support the rotating shaft; A third bending bearing portion and a fourth bending bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the second pressing roller and rotatably support the rotating shaft; A first compression mechanism, which can apply a load to at least one of the first main bearing portion and the third main bearing portion in a direction approaching the first pressing roller and the second pressing roller; A second compression mechanism, which can apply a load to at least one of the second main bearing portion and the fourth main bearing portion in a direction approaching the first pressing roller and the second pressing roller; A first bending mechanism, which can apply a load to at least one of the first bending bearing portion and the third bending bearing portion in a direction of separating / contacting the first pressing roller and the second pressing roller; A second bending mechanism, which can apply a load to at least one of the second bending bearing portion and the fourth bending bearing portion in a direction of separating / contacting the first pressing roller and the second pressing roller; A thickness gauge, which is arranged on the outlet side of the first pressing roller and the second pressing roller, and detects the thickness of the electrode plates of the secondary battery at three points, namely, a first point, a second point, and a third point, arranged along the width direction of the electrode plates; A calculation unit, which calculates the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism respectively based on the thickness measurement values of the three points based on the detection values of the thickness gauge and a thickness target value, and A control unit, which controls the loads of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism respectively based on the set values calculated by the calculation unit; The first point is set at the end of the electrode plate of the secondary battery on the side where the first compression mechanism is arranged; The second point is set at the central portion of the electrode plate of the secondary battery; The third point is set at the end of the electrode plate of the secondary battery on the side where the second compression mechanism is arranged; The above calculation unit calculates three characteristic quantities, namely, a first deviation between the first position thickness measurement value and the thickness target value, a second deviation between the third position thickness measurement value and the thickness target value, and a second component of the thickness profile of the electrode plate, based on the first position thickness measurement value, the second position thickness measurement value, the third position thickness measurement value, and the above-mentioned thickness target value, and appropriately changes the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on the three characteristic quantities; The second component of the thickness profile of the electrode plate is defined as the difference between the second position thickness measurement value and the average value of the first position thickness measurement value and the third position thickness measurement value.

2. The rolling device according to claim 1, wherein, The above calculation unit calculates the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism respectively in such a way that the three characteristic quantities are all zero, based on the relationship between the load generated by the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism and the three characteristic quantities derived in advance.

3. The rolling device according to claim 2, wherein, The first compression mechanism includes a cylinder for the first pressing; The second compression mechanism includes a cylinder for the second pressing; The first bending mechanism includes a cylinder for the first bending; The second bending mechanism includes a cylinder for the second bending; The above calculation unit calculates the set values of the pressure of the cylinder for the first pressing, the pressure of the cylinder for the second pressing, the pressure of the cylinder for the first bending, and the pressure of the cylinder for the second bending respectively in such a way that the three characteristic quantities are all zero.

4. The rolling device according to claim 2, wherein, The first compression mechanism includes a cylinder for the first pressing; The second compression mechanism includes a cylinder for the second pressing; The first bending mechanism includes a cylinder for the first bending; The second bending mechanism includes a cylinder for the second bending; The above calculation unit calculates the set values of the position of the cylinder for the first pressing, the position of the cylinder for the second pressing, the pressure of the cylinder for the first bending, and the pressure of the cylinder for the second bending respectively in such a way that the three characteristic quantities are all zero.

5. The rolling device according to claim 4, wherein, The first compression mechanism further includes a first magnetic scale for measuring the position of the cylinder for the first pressing; The second compression mechanism further includes a second magnetic scale for measuring the position of the cylinder for the second pressing; The above control unit controls the pressure of the cylinder for the first pressing so that the position of the cylinder for the first pressing measured by the first magnetic scale is consistent with the position of the cylinder for the first pressing supplied from the above calculation unit, and controls the pressure of the cylinder for the second pressing so that the position of the cylinder for the second pressing measured by the second magnetic scale is consistent with the position of the cylinder for the second pressing supplied from the above calculation unit.

6. The rolling device according to claim 2, wherein, The above-mentioned first compression mechanism includes a first electric screw; The above-mentioned second compression mechanism includes a second electric screw; The above-mentioned first bending mechanism includes a cylinder for first bending; The above-mentioned second bending mechanism includes a cylinder for second bending; The above-mentioned calculation unit calculates the set values of the position of the first electric screw, the position of the second electric screw, the pressure of the cylinder for first bending, and the pressure of the cylinder for second bending in such a way that all of the above three characteristic quantities are zero.

7. The roll pressing device according to claim 2, wherein The above-mentioned first compression mechanism includes a first electric pin; The above-mentioned second compression mechanism includes a second electric pin; The above-mentioned first bending mechanism includes a cylinder for first bending; The above-mentioned second bending mechanism includes a cylinder for second bending; The above-mentioned calculation unit calculates the set values of the height of the first electric pin, the height of the second electric pin, the pressure of the cylinder for first bending, and the pressure of the cylinder for second bending in such a way that all of the above three characteristic quantities are zero.

8. The roll pressing device according to claim 1 or 2, wherein The above-mentioned thickness gauge scans a thickness detection sensor along the width direction of the electrode plate, continuously detects the thickness of the electrode plate, and extracts the thickness detection values at the above three points.

9. The roll pressing device according to claim 1 or 2, wherein The above-mentioned thickness gauge detects the thickness at the above three points with three or more thickness detection sensors respectively.

10. The roll pressing device according to claim 8, wherein It further includes a thickness measurement value calculation unit, which filters three or more thickness detection values detected by the above-mentioned thickness gauge along the length direction of the electrode plate and calculates the thickness measurement values at the above three points.

11. The roll pressing device according to claim 1 or 2, wherein After the above-mentioned calculation unit changes the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism, it retains the change of the set values of the next first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism until a predetermined condition related to the pass line length from the pressing position to the thickness gauge and the time until the change of the set value is reflected in the actual output is satisfied.

12. A control device, which is used in a roll pressing device; The roll pressing device includes: A first pressing roller and a second pressing roller, which roll by sandwiching an electrode plate of a secondary battery being continuously conveyed; A first main bearing portion and a second main bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the first pressing roller and rotatably support the rotating shaft; A third main bearing portion and a fourth main bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the second pressing roller and rotatably support the rotating shaft; A first bending bearing portion and a second bending bearing portion, which are respectively arranged on one side and the other side of the rotating shaft of the first pressing roller and rotatably support the rotating shaft; The third bending bearing portion and the fourth bending bearing portion are respectively provided on one side and the other side of the rotating shaft of the second pressing roller, and rotatably support the rotating shaft. The first compression mechanism is capable of applying a load in a direction approaching the first pressing roller and the second pressing roller to at least one of the first main bearing portion and the third main bearing portion. The second compression mechanism is capable of applying a load in a direction approaching the first pressing roller and the second pressing roller to at least one of the second main bearing portion and the fourth main bearing portion. The first bending mechanism is capable of applying a load in a direction of separating / contacting the first pressing roller and the second pressing roller to at least one of the first bending bearing portion and the third bending bearing portion. The second bending mechanism is capable of applying a load in a direction of separating / contacting the first pressing roller and the second pressing roller to at least one of the second bending bearing portion and the fourth bending bearing portion, and A thickness gauge is provided on the output side of the first pressing roller and the second pressing roller, and measures the thickness of the electrode plate of the secondary battery at three points, namely the first point, the second point, and the third point arranged in the width direction of the electrode plate. The control device includes: A calculation unit that calculates set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on the thickness measurement values at the three points and the thickness target value based on the detection values of the thickness gauge, and A control unit that controls the loads of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism respectively based on the set values calculated by the calculation unit. The first point is set at the end of the electrode plate of the secondary battery on the side where the first compression mechanism is provided. The second point is set at the central portion of the electrode plate of the secondary battery. The third point is set at the end of the electrode plate of the secondary battery on the side where the second compression mechanism is provided. The calculation unit calculates three characteristic quantities, namely, the first deviation between the thickness measurement value at the first point and the thickness target value, the second deviation between the thickness measurement value at the third point and the thickness target value, and the second component of the thickness profile of the electrode plate, based on the thickness measurement value at the first point, the thickness measurement value at the second point, the thickness measurement value at the third point, and the thickness target value, and appropriately changes the set values of the first compression mechanism, the second compression mechanism, the first bending mechanism, and the second bending mechanism based on the three characteristic quantities. The second component of the thickness profile of the electrode plate is defined as the difference between the thickness measurement value at the second point and the average value of the thickness measurement values at the first point and the third point.

Images