Electrode calendering device

Abstract

Provided is an electrode rolling device that reduces the difference in thickness of an electrode sheet at a position in the width direction. The electrode rolling device acquires a thickness Tc of a central portion in a width direction of an electrode sheet, a thickness Twe of an end portion on a first side, a thickness Tde of an end portion on a second side, a thickness Twc of a first intermediate portion between the central portion and the end portion on the first side, and a thickness Tdc of a second intermediate portion between the central portion and the end portion on the second side. The electrode rolling device obtains a deviation [Delta] Twe between the thickness Tc and the thickness Twe and a deviation [Delta] Twc between the thickness Tc and the thickness Twc, obtains a deviation [Delta] Tde between the thickness Tc and the thickness Tde and a deviation [Delta] Tdc between the thickness Tc and the thickness Tdc, and performs control so that the larger one of the deviation [Delta] Twe and the deviation [Delta] Twc and the larger one of the deviation [Delta] Tde and the deviation [Delta] Tdc becomes smaller.

Description

Technical Field

[0001] The invention relates to an electrode calendering device. Background Art

[0002] For example, Japanese Patent No. 5328876 discloses a roller press for rolling materials such as electrode materials for lithium-ion secondary batteries. The roller press described in Japanese Patent No. 5328876 has: an upper roller and a lower roller; a pressure cylinder that generates a pressing load between the upper roller and the lower roller; a roller drive mechanism; a bending cylinder that corrects the deflection of the roller; and a thickness gauge that measures the thickness of the material at three points in the center of the width direction of the material, the roller drive mechanism side (drive side), and the side without the roller drive mechanism (operation side). The roller press described in Japanese Patent No. 5328876 is configured such that when the difference in material thickness from the target thickness is outside the threshold, feedback control of the pressure cylinder and the bending cylinder is performed separately or in combination. In detail, in the roller press described in Japanese Patent Gazette No. 5328876, when the material thickness on the driving side or the operating side is outside the threshold, the pressing pressure of the pressure cylinder is controlled, and when the material thickness on the driving side and the operating side is within the threshold and the material thickness in the center is outside the threshold, the bending pressure of the bending cylinder is controlled.

[0003] International Publication No. 2021 / 140747 also discloses a roller pressing device having the same structure as the roller pressing machine of Japanese Patent No. 5328876. The roller pressing device described in International Publication No. 2021 / 140747 is configured to calculate the difference between the target thickness value and the thickness measurement value on the driving side, the difference between the target thickness value and the thickness measurement value on the operating side, and the difference between the central thickness measurement value and the average value of the thickness measurement values ​​on the driving side and the operating side. The roller pressing device described in International Publication No. 2021 / 140747 applies the above-calculated three differences to a predetermined calculation formula to set the pressure of the pressure cylinder on the driving side, the pressure cylinder on the operating side, the bending cylinder on the driving side, and the bending cylinder on the operating side.

[0004] The roller pressing device described in International Publication No. 2020 / 100561 is configured to calculate the difference between the target thickness value and the central thickness measurement value, the difference between the central thickness measurement value and the average value of the thickness measurement values ​​on the driving side and the operating side, and the difference between the thickness measurement value on the driving side and the thickness measurement value on the operating side. The roller pressing device described in International Publication No. 2020 / 100561 applies the above-calculated three differences to a predetermined calculation formula to set the pressure of the pressure cylinder on the driving side, the pressure cylinder on the operating side, the bending cylinder on the driving side, and the bending cylinder on the operating side. According to International Publication No. 2020 / 100561, through this control, the thickness control of the roller pressing device can be highly accurate.

[0005] Patent Document 1: Japanese Patent No. 5328876

[0006] Patent Document 2: International Publication No. 2021 / 140747

[0007] Patent Document 3: International Publication No. 2020 / 100561

[0008] The rolling device described in the above document performs control assuming that the thickness of the electrode sheet changes smoothly in a manner that the central portion is convex or concave. However, the thickness of the electrode sheet sometimes changes in an undulating manner along the width direction. Here, an electrode rolling device is proposed that can reduce the difference in thickness of the electrode sheet based on the position in the width direction even when the electrode sheet is undulating along the width direction. Summary of the invention

[0009] The electrode rolling device disclosed herein comprises: a conveying device that conveys a strip-shaped electrode sheet formed with an electrode active material layer along a predetermined conveying path; a rolling device that is arranged on the conveying path and rolls the electrode sheet; and a control device. The rolling device comprises: a pair of rolling rollers that clamp the electrode sheet; a first gap adjustment mechanism that adjusts the gap between the pair of rolling rollers on the first side in the width direction of the pair of rolling rollers; a second gap adjustment mechanism that adjusts the gap between the pair of rolling rollers on the second side in the width direction of the pair of rolling rollers; a first bending mechanism that corrects the deflection of the pair of rolling rollers on the first side in the width direction of the pair of rolling rollers; and a second bending mechanism that corrects the deflection of the pair of rolling rollers on the second side in the width direction of the pair of rolling rollers. The control device obtains the thickness Tc of the central portion in the width direction of the electrode sheet, the thickness Twe of the end portion on the first side, the thickness Tde of the end portion on the second side, the thickness Twc of the first intermediate portion set between the central portion and the end portion on the first side, and the thickness Tdc of the second intermediate portion set between the central portion and the end portion on the second side. The control device obtains a deviation ΔTwe between the thickness Tc of the central portion and the thickness Twe of the end portion on the first side, and a deviation ΔTwc between the thickness Tc of the central portion and the thickness Twc of the first intermediate portion, and obtains a deviation ΔTde between the thickness Tc of the central portion and the thickness Tde of the end portion on the second side, and a deviation ΔTdc between the thickness Tc of the central portion and the thickness Tdc of the second intermediate portion. The control device controls the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism so that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller.

[0010] According to the electrode rolling device, the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism are controlled in such a manner that the larger deviation of the deviation ΔTwe between the thickness Tc of the central portion in the width direction of the electrode sheet and the thickness Twe of the end portion on the first side and the deviation ΔTwc between the thickness Tc of the central portion and the thickness Twc of the first middle portion is reduced, or the larger deviation of the deviation ΔTde between the thickness Tc of the central portion and the thickness Tde of the end portion on the second side and the deviation ΔTdc between the thickness Tc of the central portion and the thickness Tdc of the second middle portion is reduced. Therefore, even when the thickness of the first middle portion or the second middle portion is thicker or thinner due to undulation, the difference in thickness of the electrode sheet based on the position in the width direction can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic side view of an electrode rolling device.

[0012] Figure 2 It is a schematic front view of an electrode rolling device.

[0013] Figure 3 It is a schematic top view of an electrode rolling device.

[0014] Figure 4 It is a control block diagram of the electrode rolling device.

[0015] Figure 5 This is a flow chart showing the flow of feedback control of the thickness of the electrode sheet.

[0016] Figure 6 It is a schematic diagram showing a distribution pattern of thickness of an electrode sheet based on positions in the width direction.

[0017] Figure 7 This is a graph showing the maximum variation in thickness of the electrode sheet.

[0018] Description of reference numerals:

[0019] 1…electrode sheet; 1C…central portion; 1WE…end portion on the workpiece side (end portion on the first side); 1DE…end portion on the driving side (end portion on the second side); 1WC…first intermediate portion; 1DC…second intermediate portion; 2…collector foil; 3…electrode active material layer; 4…unformed portion; 10…electrode rolling device; 20…conveying device; 21…winding device; 22…encoder; 30…roller press (rolling device); 31…upper roller; 32…lower roller; 33L…left side bearing of upper roller; 33R…right side bearing of upper roller; 34L…left side bearing of lower roller; 34R…right side bearing of lower roller; 35L…left side bending bearing of upper roller; 35R…upper roller; 36…lower roller; 37…lower roller; 38…lower roller; 39…lower roller; 40…lower roller; 41…lower roller; 42…lower roller; 43…lower roller; 44…lower roller; 45…lower roller; 46…lower roller; 47…lower roller; 48…lower roller; 49…lower roller; 50…lower roller; 51…lower roller; 52…lower roller; 53…lower roller; 54…lower roller; 55…lower roller; 56…lower roller; 57…lower roller; 58…lower roller; 59…lower roller; 60…lower roller; 61…lower roller; 62…lower roller; 63…lower roller; 64…lower roller; 65…lower roller; 66…lower roller; 67…lower roller; 68…lower roller; 69…lower roller; 70…lower roller; Right bending bearing of roller; 36L…left bending bearing of lower roller; 36R…right bending bearing of lower roller; 41…upper roller rotating device; 42…lower roller rotating device; 50L…first gap adjustment mechanism; 50R…second gap adjustment mechanism; 51L…first pressure cylinder; 51R…second pressure cylinder; 60L…first bending mechanism; 60R…second bending mechanism; 61L…first bending cylinder; 61R…second bending cylinder; 70…upstream thickness measuring device (second thickness measuring device); 71…non-contact displacement sensor; 80…downstream thickness measuring device (first thickness measuring device); 81…non-contact displacement sensor; 100…control device; 101…upstream side thickness acquisition unit; 102…downstream side thickness acquisition unit; 103…conveying speed acquisition unit; 104…control storage unit; 105…control selection unit; 106…control value setting unit; 107…execution determination unit; 108…first gap setting unit; 109…second gap setting unit; 110…first bending pressure setting unit; 111…second bending pressure setting unit; Tc…central portion thickness; Twe…workpiece side end thickness (first side end thickness); Tde…drive side end thickness (second side end thickness); Twc…first intermediate portion thickness; Tdc… The thickness of the second middle part; Tc0…the thickness of the central part (before rolling); Twe0…the thickness of the end on the workpiece side (the thickness of the end on the first side, before rolling); Tde0…the thickness of the end on the driving side (the thickness of the end on the second side, before rolling); Twc0…the thickness of the first middle part (before rolling); Tdc0…the thickness of the second middle part (before rolling); ΔTwe…the deviation between Tc and Twe; ΔTwc…the deviation between Tc and Twc; ΔTde…the deviation between Tc and Tde; ΔTdc…the deviation between Tc and Tdc; Vw1…the threshold value; Vw2…the threshold value; Vw3…the threshold value; Vw4…the threshold value; Vv…the threshold speed. DETAILED DESCRIPTION

[0020] Hereinafter, one embodiment of an electrode rolling device for an electrical storage device will be described. It is to be understood that the embodiments described here are not intended to limit the present invention in particular. In addition, each figure is a schematic diagram and does not necessarily faithfully reflect an actual implementation product.

[0021] [Structure of electrode rolling device]

[0022] Figure 1 It is a schematic side view of an electrode rolling device 10 according to one embodiment. Figure 2 It is a schematic front view of the electrode rolling device 10 . Figure 3 It is a schematic top view of the electrode rolling device 10. The electrode rolling device 10 is a device that rolls a strip-shaped electrode sheet 1 formed with an electrode active material layer 3 to form it into a thickness within a specified range. Here, the electrode sheet 1 is an electrode sheet of a lithium-ion secondary battery. However, the electrode sheet 1 is not limited to the electrode sheet of a lithium-ion secondary battery, and can also be an electrode sheet of various well-known power storage devices. Power storage devices refer to the term for all devices that can extract electrical energy, including so-called storage batteries (chemical batteries) such as lithium-ion secondary batteries and nickel-metal hydride batteries, and capacitors (physical batteries) such as double-layer capacitors.

[0023] like Figure 3 As shown, the electrode sheet 1 includes a strip-shaped collector foil 2 and an electrode active material layer 3 formed on the collector foil 2. The portion of the collector foil 2 where the electrode active material layer 3 is not formed constitutes an unformed portion 4. The positive electrode sheet is a component in which a positive electrode active material layer 3 containing a positive electrode active material is formed on the surface of a strip-shaped collector foil 2 (e.g., aluminum foil) of a predetermined width and thickness. The positive electrode active material is, for example, a material that can release lithium ions during charging and absorb lithium ions during discharge, such as a lithium transition metal composite material in a lithium ion secondary battery. In the positive electrode sheet, the electrode active material layer 3 and the unformed portion 4 are protected by a protective layer. The negative electrode sheet is a component in which a negative electrode active material layer 3 containing a negative electrode active material is formed on the surface of a strip-shaped collector foil 2 (e.g., copper foil) of a predetermined width and thickness. The negative electrode active material is, for example, a material that can absorb lithium ions during charging, such as natural graphite in a lithium ion secondary battery, and release the lithium ions absorbed during charging during discharge. Regarding the positive electrode active material and the negative electrode active material, various materials other than the above-mentioned materials have been proposed, and the positive electrode active material is not particularly limited.

[0024] like Figure 1 As shown, the electrode rolling device 10 includes a conveying device 20, a roller press 30, an upstream thickness measuring device 70, a downstream thickness measuring device 80, and a control device 100. The electrode rolling device 10 may also include an inspection device, etc., but the description and illustration are omitted here.

[0025] The conveying device 20 conveys the electrode sheet 1 in the long side direction along a predetermined conveying path. Here, the conveying device 20 includes a winding device 21 that is arranged at the most downstream of the electrode rolling device 10 and winds the rolled electrode sheet 1. The strip-shaped electrode sheet 1 is conveyed in the long side direction by being wound on the winding device 21. The conveying device 20 is configured to measure and adjust the speed of conveying the electrode sheet 1. The winding device 21 has an encoder 22 for reading the rotation angle. The speed of conveying the electrode sheet 1 is calculated based on the rotation angle of the winding device 21 read by the encoder 22. The winding device 21 is configured to control the rotation speed. However, the structure of the conveying device 20 is not limited to the above case.

[0026] The roller press 30 is arranged on the conveying path of the electrode sheet 1. The roller press 30 rolls the electrode sheet 1. Figure 2 As shown in FIG. 1 , the roller press 30 includes a pair of calendering rollers 31 and 32 for clamping the electrode sheet 1. Here, the pair of calendering rollers 31 and 32 are composed of an upper roller 31 and a lower roller 32. The upper roller 31 and the lower roller 32 are respectively cylindrical and extend in the width direction of the electrode sheet 1. In addition, for convenience, the width direction ( Figure 2 The left and right direction is also called the left and right direction. Figure 2 The left and right sides of the roller press 30 are also referred to as the left and right sides of the roller press 30 .

[0027] The upper roller 31 is supported by the left bearing 33L and the right bearing 33R so as to be rotatable in the front-to-back direction. The lower roller 32 is supported by the left bearing 34L and the right bearing 34R so as to be rotatable in the front-to-back direction. The roller press 30 is provided with an upper roller rotating device 41 for rotating the upper roller 31 in the front-to-back direction, and a lower roller rotating device 42 for rotating the lower roller 32 in the front-to-back direction. The upper roller rotating device 41 is configured to control the rotation speed of the upper roller 31. The lower roller rotating device 42 is configured to control the rotation speed of the lower roller 32. Hereinafter, the side in the elongation direction (width direction of the electrode sheet 1) of the calendering rollers 31 and 32 where the upper roller rotating device 41 and the lower roller rotating device 42 are arranged is also referred to as the drive side, and the opposite side is also referred to as the workpiece side. In the present embodiment, the drive side is the right side, and the workpiece side is the left side.

[0028] like Figure 2As shown, the roller press machine 30 includes a first gap adjustment mechanism 50L for adjusting the gap between the pair of calendering rollers 31 and 32 on the workpiece side of the pair of calendering rollers 31, and a second gap adjustment mechanism 50R for adjusting the gap between the pair of calendering rollers 31 and 32 on the drive side of the pair of calendering rollers 31 and 32. The roller press machine 30 also includes a first bending mechanism 60L for correcting the deflection of the pair of calendering rollers 31 and 32 on the workpiece side of the pair of calendering rollers 31 and 32, and a second bending mechanism 60R for correcting the deflection of the pair of calendering rollers 31 and 32 on the drive side of the pair of calendering rollers 31 and 32. The workpiece side is an example of the first side in the width direction of the electrode sheet 1. The drive side is an example of the second side in the width direction of the electrode sheet 1.

[0029] like Figure 2 As shown, in the present embodiment, the first gap adjustment mechanism 50L includes a first pressure cylinder 51L that moves the left side bearing 34L of the lower roller 32 in the up-down direction. The first pressure cylinder 51L generates a pressing load between the portion of the upper roller 31 on the workpiece side and the portion of the lower roller 32 on the workpiece side. The first gap adjustment mechanism 50L adjusts the gap on the workpiece side of the pair of calendering rollers 31 and 32 by adjusting the pressing load. The second gap adjustment mechanism 50R includes a second pressure cylinder 51R that moves the right side bearing 34R of the lower roller 32 in the up-down direction. The second pressure cylinder 51R generates a pressing load between the portion of the upper roller 31 on the drive side and the portion of the lower roller 32 on the drive side. The second gap adjustment mechanism 50R adjusts the gap on the drive side of the pair of calendering rollers 31 and 32 by adjusting the pressing load.

[0030] The first bending mechanism 60L includes a first bending cylinder 61L that applies forces in directions that are opposite to each other between a portion of the upper roller 31 on the workpiece side and a portion of the lower roller 32 on the workpiece side. By adjusting the force of the first bending cylinder 61L, the deflection of the portion of the upper roller 31 on the workpiece side and the portion of the lower roller 32 on the workpiece side can be corrected or bent. The first bending mechanism 60L is configured to change the gap between a pair of rolling rollers 31 and 32 at the end portion on the workpiece side. The roller press 30 includes: a left side bending bearing 35L, which is arranged at a position to the left of the left side bearing 33L of the upper roller 31 and supports the upper roller 31 to be rotatable; and a right side bending bearing 35R, which is arranged at a position to the right of the right side bearing 33R and supports the upper roller 31 to be rotatable. In addition, the roller press 30 includes a left side bending bearing 36L, which is arranged on the left side of the left side bearing 34L of the lower roller 32 and rotatably supports the lower roller 32, and a right side bending bearing 36R, which is arranged on the right side of the right side bearing 34R and rotatably supports the lower roller 32. The first bending cylinder 61L is configured to apply a force in a direction in which the left side bending bearing 35L of the upper roller 31 and the left side bending bearing 36L of the lower roller 32 are separated from each other.

[0031] The second bending mechanism 60R includes a second bending cylinder 61R that applies a load in a direction that is away from each other between the driving side portion of the upper roller 31 and the driving side portion of the lower roller 32. By adjusting the load of the second bending cylinder 61R, the deflection of the driving side portion of the upper roller 31 and the driving side portion of the lower roller 32 can be corrected or bent. The second bending mechanism 60R is configured to change the gap between the pair of calender rollers 31 and 32 at the end portion on the driving side. The second bending cylinder 61R is configured to apply a force in a direction that is away from each other to the right bending bearing 35R of the upper roller 31 and the right bending bearing 36R of the lower roller 32.

[0032] like Figure 3 As shown, the upstream thickness measuring device 70 measures the thickness of the electrode sheet 1 upstream of the roller press 30 in the conveying path. The upstream thickness measuring device 70 measures the thickness of the electrode sheet 1 before being rolled by the roller press 30. The upstream thickness measuring device 70 measures the thickness of five points at different positions in the width direction of the electrode sheet 1. In detail, the upstream thickness measuring device 70 measures the thickness Tc0 of the central portion 1C of the electrode sheet 1 before rolling, the thickness Twe0 of the end portion 1WE on the workpiece side, the thickness Tde0 of the end portion 1DE on the driving side, the thickness Twc0 of the first middle portion 1WC set between the central portion 1C and the end portion 1WE on the workpiece side, and the thickness Tdc0 of the second middle portion 1DC set between the central portion 1C and the end portion 1DE on the driving side (all refer to Figure 6, but only in Figure 6 Here, the upstream side thickness measuring device 70 includes five non-contact type displacement sensors 71 respectively provided above the central portion 1C, the end portion 1WE on the workpiece side, the end portion 1DE on the drive side, the first intermediate portion 1WC, and the second intermediate portion 1DC of the electrode sheet 1. However, the structure of the upstream side thickness measuring device 70 is not particularly limited.

[0033] like Figure 3 As shown, the downstream side thickness measuring device 80 measures the thickness of the electrode sheet 1 downstream of the roller press 30 in the conveying path. The downstream side thickness measuring device 80 measures the thickness of the electrode sheet 1 after being rolled by the roller press 30. The downstream side thickness measuring device 80 also measures the thickness of the same five points on the electrode sheet 1 as the upstream side thickness measuring device 70. That is, the downstream side thickness measuring device 80 measures the thickness Tc of the central portion 1C of the electrode sheet 1 after rolling, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first middle portion 1WC, and the thickness Tdc of the second middle portion 1DC (all refer to Figure 6 , and for the reference numerals indicating the thickness after rolling, reference numerals different from those indicating the thickness before rolling are used for measurement. Here, the downstream side thickness measuring device 80 includes five non-contact type displacement sensors 81 respectively provided above the central portion 1C, the end portion 1WE on the workpiece side, the end portion 1DE on the drive side, the first intermediate portion 1WC, and the second intermediate portion 1DC of the electrode sheet 1. However, the structure of the downstream side thickness measuring device 80 is not particularly limited.

[0034] Figure 4 1 is a control block diagram of the electrode rolling device 10. Figure 4 As shown in FIG. 1 , the control device 100 of the electrode rolling device 10 is connected to the winding device 21, the upper roller rotating device 41, the lower roller rotating device 42, the first pressure cylinder 51L, the second pressure cylinder 51R, the first bending cylinder 61L, and the second bending cylinder 61R of the conveying device 20 to control their operations. In addition, the control device 100 is connected to the encoder 22 of the conveying device 20, the upstream side thickness measuring device 70, and the downstream side thickness measuring device 80 to receive signals from them.

[0035] The structure of the control device 100 is not particularly limited. The control device 100 includes, for example, a microcomputer. The microcomputer may include, for example, an interface (I / F) for receiving data from an external device, a central processing unit (CPU) for executing program commands, a ROM (read only memory) for storing programs executed by the CPU, a RAM (random access memory) used as a work area for expanding the program, and a storage device such as a memory for storing the above-mentioned programs and various data.

[0036] like Figure 4 As shown, the control device 100 includes an upstream side thickness acquisition unit 101, a downstream side thickness acquisition unit 102, a conveying speed acquisition unit 103, a control type storage unit 104, a control type selection unit 105, a control value setting unit 106, an execution determination unit 107, a first gap setting unit 108, a second gap setting unit 109, a first bending pressure setting unit 110, and a second bending pressure setting unit 111.

[0037] The upstream side thickness acquisition unit 101 acquires the thickness of the electrode sheet 1 measured by the upstream side thickness measuring device 70. The upstream side thickness acquisition unit 101 acquires the thickness Tc0 of the central portion 1C in the width direction, the thickness Twe0 of the end portion 1WE on the workpiece side, the thickness Tde0 of the end portion 1DE on the drive side, the thickness Twc0 of the first intermediate portion 1WC, and the thickness Tdc0 of the second intermediate portion 1DC in the electrode sheet 1 before rolling.

[0038] The downstream side thickness obtaining unit 102 obtains the thickness of the electrode sheet 1 measured by the downstream side thickness measuring device 80. The downstream side thickness obtaining unit 102 obtains the thickness Tc of the central portion 1C in the width direction, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the drive side, the thickness Twc of the first intermediate portion 1WC, and the thickness Tdc of the second intermediate portion 1DC in the rolled electrode sheet 1.

[0039] The conveyance speed acquisition unit 103 acquires the conveyance speed of the electrode sheet 1 measured by the encoder 22 .

[0040] The control formula storage unit 104 stores the first to eighth control formulas for calculating control values ​​of the first pressure cylinder 51L, the second pressure cylinder 51R, the first bending cylinder 61L, and the second bending cylinder 61R. The control formula to be used is selected from the first to eighth control formulas according to the thickness distribution along the width direction of the electrode sheet 1.

[0041] The first control equation is used when Twc>Tc and Twc>Twe, and is a control equation for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Twc>Tc and Twc>Twe hold, the thickness Twc of the first intermediate portion 1WC is thicker than the thickness Tc of the center portion 1C and the thickness Twe of the end portion 1WE on the workpiece side. That is, the workpiece side of the electrode sheet 1 undulates in a manner such that the first intermediate portion 1WC is convex (see Figure 6 of [Mode 1]).

[0042] The first control formula includes the following when the distance in the width direction between the center portion 1C and the end portion 1WE on the workpiece side is Dwe, and the distance in the width direction between the center portion 1C and the first intermediate portion 1WC is Dwc (see Figure 6 ), find the corrected deviation ΔTw = ΔTwc × Dwc / Dwe. ΔTwc is the deviation between the thickness Tc of the central portion 1C after rolling and the thickness Twc of the first middle portion 1WC, here is the absolute value of (Twc-Tc). In this specification, the deviations ΔTw and ΔTwc are the absolute values ​​of the differences, that is, positive values. The same is true when expressed as "deviation", "difference", etc. hereinafter. Therefore, the comparison of the size of the deviation is based on the comparison of absolute values. However, the deviation can also be defined by including a symbol. In this case, the description of this specification can be appropriately replaced according to the definition. In addition, in the following, ΔTwe is the deviation between the thickness Tc of the central portion 1C after rolling and the thickness Twe of the end portion 1WE on the workpiece side, here, it represents the absolute value of (Twe-Tc).

[0043] The first control equation is constructed as follows: When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold value Vw1 (refer to Figure 5 ), or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw1, the control value of the first gap adjustment mechanism 50L is set so as to narrow the gap between a pair of calendering rollers 31 and 32 on the workpiece side, and the control value of the first bending mechanism 60L is set so as to widen the gap between the pair of calendering rollers 31 and 32 at the end 1WE on the workpiece side.

[0044] Here, the first control formula increases the pressing pressure of the first pressure cylinder 51L by a predetermined pressure compared to before when the deviation ΔTwe or the corrected deviation ΔTw exceeds the threshold value Vw1. In addition, in this case, the first control formula increases the bending pressure of the first bending cylinder 61L by a predetermined pressure compared to before. The control formula selection unit 105 selects the first control formula as the control formula for setting the control values ​​of the first pressure cylinder 51L and the first bending cylinder 61L when Twc>Tc and Twc>Twe are established. The first gap setting unit 108 controls the pressing pressure of the first pressure cylinder 51L so as to achieve the set pressing pressure. The first bending pressure setting unit 110 controls the bending pressure of the first bending cylinder 61L so as to achieve the set bending pressure. The control device 100 repeats this feedback control until the state in which the deviation ΔTwe or the corrected deviation ΔTw exceeds the threshold value Vw1 is eliminated.

[0045] The second control equation is used when Twc<Tc and Twc<Twe, and is a control equation for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Twc<Tc and Twc<Twe hold, the thickness Twc of the first intermediate portion 1WC is thinner than the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side. That is, the workpiece side of the electrode sheet 1 is undulated in a manner such that the first intermediate portion 1WC is concave (see Figure 6 [Mode 2]).

[0046] The second control equation is constructed as follows: When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold value Vw2 (refer to Figure 5 ), or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw2, the control value of the first gap adjustment mechanism 50L is set so that the gap between the pair of calendering rollers 31 and 32 on the workpiece side becomes wider, and the control value of the first bending mechanism 60L is set so that the gap between the pair of calendering rollers 31 and 32 at the end 1WE on the workpiece side becomes narrower. The feedback control using the second control formula is the same as the case of using the first control formula. The same is true for other control formulas. The threshold value Vw2 may be the same as or different from the threshold value Vw1.

[0047] The third control equation is used when Tc≦Twc≦Twe, and is a control equation for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Tc≦Twc≦Twe holds, the thickness of the workpiece side of the electrode sheet 1 is thinnest at the central portion 1C, and becomes thicker as the distance between the first intermediate portion 1WC and the end portion 1WE on the workpiece side and the central portion 1C increases (see Figure 6[Mode 3]).

[0048] The third control equation is configured such that when the deviation ΔTwe between the thickness Tc of the center portion 1C and the thickness Twe of the end portion 1WE on the workpiece side exceeds a predetermined threshold value Vw3 (see Figure 5 ), the control value of the first bending mechanism 60L is set so as to narrow the gap between the pair of rolling rollers 31 and 32 at the end 1WE on the workpiece side.

[0049] The fourth control equation is used when Tc≧Twc≧Twe, and is a control equation for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Tc≧Twc≧Twe holds, the thickness of the workpiece side of the electrode sheet 1 is thickest at the central portion 1C, and becomes thinner as the distance between the first intermediate portion 1WC and the end portion 1WE on the workpiece side and the central portion 1C increases (see Figure 6 [Mode 4]).

[0050] The fourth control equation is configured such that when the deviation ΔTwe between the thickness Tc of the center portion 1C and the thickness Twe of the end portion 1WE on the workpiece side exceeds a predetermined threshold value Vw4 (see Figure 5 ), the control value of the first bending mechanism 60L is set so as to widen the gap between the pair of rolling rollers 31 and 32 at the end 1WE on the workpiece side.

[0051] As described above, the first to fourth control formulas are control formulas for correcting the difference in thickness of the electrode sheet 1 on the workpiece side. The first to fourth control formulas are respectively applied to the first case where the electrode sheet 1 undulates in a convex manner in the first middle portion 1WC, the second case where the electrode sheet 1 undulates in a concave manner in the first middle portion 1WC, the third case where the thickness becomes thicker toward the end portion 1WE on the workpiece side, and the fourth case where the thickness becomes thinner toward the end portion 1WE on the workpiece side. The control device 100 compares the measured values ​​of the thickness Tc of the central portion 1C, the thickness Twe of the end portion 1WE on the workpiece side, and the thickness Twc of the first middle portion 1WC, and determines which control formula of the first to fourth control formulas should be used based on the comparison result. The control device 100 obtains the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side, and the deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first middle portion 1WC. As described above, when using any of the first to fourth control equations, the control device 100 controls the first gap adjustment mechanism 50L and the first bending mechanism 60L so that the larger deviation between the deviation ΔTwe and the deviation ΔTwc becomes smaller.

[0052] The fifth to eighth control equations are control equations for correcting the difference in thickness on the driving side of the electrode sheet 1 , and correspond to the first to fourth control equations, which are control equations on the workpiece side, respectively.

[0053] The fifth control equation is used when Tdc>Tc and Tdc>Tde, and is a control equation for obtaining control values ​​for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tdc>Tc and Tdc>Tde are established, the thickness Tdc of the second intermediate portion 1DC is thicker than the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the driving side. That is, the driving side of the electrode sheet 1 is undulated in a manner that the second intermediate portion 1DC is convex (see Figure 6 [1st mode]). Although not shown in the figure, the thickness difference state (undulation in the form of convexity or concavity in the middle part, or thickness becoming thicker or thinner toward the end part) may also be different on the workpiece side and the drive side of the electrode sheet 1.

[0054] The fifth control formula includes the following when the distance in the width direction between the center portion 1C and the end portion 1DE on the driving side is set to Dde, and the distance in the width direction between the center portion 1C and the second intermediate portion 1DC is set to Ddc (see Figure 6 ), the corrected deviation ΔTd = ΔTdc × Ddc / Dde is obtained. ΔTdc is the deviation between the thickness Tc of the central portion 1C after rolling and the thickness Tdc of the second intermediate portion 1DC, and here is the absolute value of (Tdc-Tc). In addition, hereinafter, ΔTde is the deviation between the thickness Tc of the central portion 1C after rolling and the thickness Tde of the end portion 1DE on the driving side, and here represents the absolute value of (Tde-Tc).

[0055] The fifth control formula is configured such that when the deviation ΔTdc is greater than the deviation ΔTde, when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the threshold value, the control value of the second gap adjustment mechanism 50R is set so as to narrow the gap between the pair of rolling rollers 31 and 32 on the driving side, and the control value of the second bending mechanism 60R is set so as to widen the gap between the pair of rolling rollers 31 and 32 at the end 1DE on the driving side. The threshold value on the driving side may be the same as or different from the threshold value Vw1 on the workpiece side.

[0056] The fifth control formula increases the pressing pressure of the second pressure cylinder 51R by a predetermined pressure compared to before when the deviation ΔTdc is greater than the deviation ΔTde and the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the threshold value. In this case, the fifth control formula increases the bending pressure of the second bending cylinder 61R by a predetermined pressure compared to before. The control formula selection unit 105 selects the fifth control formula as the control formula for setting the control values ​​of the second pressure cylinder 51R and the second bending cylinder 61R when Tdc>Tc and Tdc>Tde are established. The second gap setting unit 109 controls the pressing pressure of the second pressure cylinder 51R so as to achieve the set pressing pressure. The second bending pressure setting unit 111 controls the bending pressure of the second bending cylinder 61R so as to achieve the set bending pressure. The control device 100 repeatedly performs this feedback control until the state in which the deviation ΔTde or the corrected deviation ΔTd exceeds the threshold value is resolved.

[0057] The sixth control equation is used when Tdc<Tc and Tdc<Tde, and is a control equation for obtaining control values ​​for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tdc<Tc and Tdc<Tde are established, the thickness Tdc of the second intermediate portion 1DC is thinner than the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the driving side. That is, the driving side of the electrode sheet 1 is undulated in a manner such that the second intermediate portion 1DC is concave (see Figure 6 [Mode 2]).

[0058] The sixth control formula is configured to set the control value of the second gap adjustment mechanism 50R so as to widen the gap between the pair of calender rolls 31 and 32 on the driving side and the control value of the second bending mechanism 60R so as to narrow the gap at the end 1DE of the pair of calender rolls 31 and 32 on the driving side when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value when the deviation ΔTdc is greater than the deviation ΔTde and the deviation ΔTde exceeds the threshold value. The threshold value of the sixth control formula may be the same as or different from the threshold value of the fifth control formula.

[0059] The seventh control equation is used when Tc≦Tdc≦Tde, and is a control equation for obtaining control values ​​for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tc≦Tdc≦Tde holds, the thickness of the driving side of the electrode sheet 1 is thinnest at the central portion 1C, and becomes thicker as the distance between the second intermediate portion 1DC and the end portion 1DE of the driving side and the central portion 1C increases (see Figure 6 [Mode 3]).

[0060] The seventh control formula is constructed as follows: when the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the driving side exceeds a predetermined threshold value, a control value of the second bending mechanism 60R is set so as to narrow the gap between a pair of calendering rollers 31 and 32 at the end portion 1DE on the driving side.

[0061] The eighth control equation is used when Tc≧Tdc≧Tde, and is a control equation for obtaining control values ​​for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tc≧Tdc≧Tde holds, the thickness of the driving side of the electrode sheet 1 is thickest in the central portion 1C, and becomes thinner as the distance between the second intermediate portion 1DC and the end portion 1DE of the driving side and the central portion 1C increases (see Figure 6 [Mode 4]).

[0062] The eighth control formula is constructed as follows: when the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the driving side exceeds a predetermined threshold value, a control value of the second bending mechanism 60R is set so as to widen the gap between a pair of calendering rollers 31 and 32 at the end portion 1DE on the driving side.

[0063] As described above, the fifth to eighth control formulas are control formulas for correcting the difference in thickness on the driving side of the electrode sheet 1. The fifth to eighth control formulas are respectively applied to the first case where the electrode sheet 1 undulates in a convex manner in the second middle portion 1DC, the second case where the electrode sheet 1 undulates in a concave manner in the second middle portion 1DC, the third case where the thickness becomes thicker toward the driving side end portion 1DE, and the fourth case where the thickness becomes thinner toward the driving side end portion 1DE. The control device 100 compares the measured values ​​of the thickness Tc of the central portion 1C, the thickness Tde of the driving side end portion 1DE, and the thickness Tdc of the second middle portion 1DC, and determines which of the fifth to eighth control formulas should be used based on the comparison result. The control device 100 obtains the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the driving side end portion 1DE, and the deviation ΔTdc between the thickness Tc of the central portion 1C and the thickness Tdc of the second middle portion 1DC. When using any of the fifth to eighth control equations, the control device 100 controls the second gap adjustment mechanism 50R and the second bending mechanism 60R so that the larger deviation between the deviation ΔTde and the deviation ΔTdc becomes smaller.

[0064] The execution determination unit 107 is configured to: when the conveying speed of the electrode sheet 1 by the conveying device 20 reaches a predetermined threshold speed Vv (refer to Figure 5), the control for correcting the difference in thickness of the electrode sheet 1 is performed, and when it is less than the threshold speed Vv, the control for correcting the difference in thickness of the electrode sheet 1 is not performed, and the rolling condition is maintained. That is, when the conveying speed of the electrode sheet 1 conveyed by the conveying device 20 is greater than the predetermined threshold speed Vv, the execution determination unit 107 controls the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R in such a manner that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller. When the conveying speed of the electrode sheet 1 conveyed by the conveying device 20 is less than the threshold speed Vv, the execution determination unit 107 maintains the control values ​​of the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R.

[0065] In the present embodiment, the control device 100 sets the initial control values ​​of the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R based on the thickness Tc0 of the central portion 1C before rolling, the thickness Twe0 of the end portion 1WE on the workpiece side, the thickness Tde0 of the end portion 1DE on the drive side, the thickness Twc0 of the first intermediate portion 1WC, and the thickness Tdc0 of the second intermediate portion 1DC. Here, the control device 100 selects one of the first to fourth control formulas and one of the fifth to eighth control formulas as the control formula to be used based on the measured values ​​of the thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0. The control device 100 sets the control value calculated by the selected control formula as the initial value when starting a new rolling of the electrode sheet 1. This can shorten the time until feedback control related to rolling of a new electrode sheet 1 becomes stable (time until the difference in thickness of the new electrode sheet 1 falls within an allowable range). As a result, the amount of electrode sheet 1 wasted in feedback control can be reduced.

[0066] However, the control formula for setting the initial control value may not be the first to eighth control formulas. For example, the control formula for setting the initial control value may be the same as the first to eighth control formulas but may have a different control value change amount or threshold value from the first to eighth control formulas.

[0067] [Electrode sheet rolling process]

[0068] Next, the rolling step of the electrode sheet 1 will be described. Figure 5 This is a flowchart showing the flow of feedback control of the thickness of the electrode sheet 1 . Figure 5This shows one feedback control, which is repeated in the rolling process of the electrode sheet 1. The setting of the initial control value based on the thickness measurement of the electrode sheet 1 before rolling is the same as the feedback control after rolling, so the description is omitted.

[0069] like Figure 5 As shown, in the feedback control of the thickness of the electrode sheet 1, in step S01, the conveying speed V of the electrode sheet 1 is obtained. In step S02, the conveying speed V of the electrode sheet 1 is compared with a predetermined threshold speed Vv. When the conveying speed V of the electrode sheet 1 is greater than the threshold speed Vv (when the result of step S02 is yes), the thickness control of the electrode sheet 1 is performed after step S03. When the conveying speed V of the electrode sheet 1 is less than the threshold speed Vv (when the result of step S02 is no), the thickness control of the electrode sheet 1 is not performed, and the control value at that time point is maintained (in the case of Figure 5 This is because when the conveying speed V of the electrode sheet 1 is slow, the electrode sheet 1 is sufficiently rolled and the difference in thickness of the electrode sheet 1 is small.

[0070] In step S03, the thickness Tc of the central portion 1C of the electrode sheet 1, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the drive side, the thickness Twc of the first middle portion 1WC, and the thickness Tdc of the second middle portion 1DC are obtained. In steps S04 to S06, for the workpiece side, it is determined which of the four modes the difference in thickness of the electrode sheet 1 is in. That is, it is determined whether the difference in thickness of the electrode sheet 1 is in the first mode of Twc>Tc and Twc>Twe (a mode in which the first middle portion 1WC is convex), the second mode of Twc<Tc and Twc<Twe (a mode in which the first middle portion 1WC is concave), the third mode of Tc≦Twc≦Twe (a mode in which it becomes thicker toward the end), and the fourth mode of Tc≧Twc≧Twe (a mode in which it becomes thinner toward the end) (refer to Figure 6 , Figure 6 Schematic diagram showing a distribution pattern of thickness of the electrode sheet 1 based on positions in the width direction).

[0071] The order of steps S04 to S06 is not particularly limited, but Figure 5In the example, in step S04, it is determined whether Twc>Tc and Twc>Twe. If the result of step S04 is yes, in step S07A, it is determined to use the first control formula. If the result of step S04 is no, in step S05, it is determined whether Twc<Tc and Twc<Twe. If the result of step S05 is yes, in step S07B, it is determined to use the second control formula. If the result of step S05 is no, in step S06, it is determined whether Tc≦Twc≦Twe. If the result of step S06 is yes, in step S07C, it is determined to use the third control formula. If the result of step S06 is no, in step S07D, it is determined to use the fourth control formula.

[0072] In step S08A following step S07A, a deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side and a deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC are obtained. Furthermore, in step S08A, the deviation ΔTwe (absolute value) and the deviation ΔTwc (absolute value) are compared.

[0073] When the deviation ΔTwc of the first intermediate portion 1WC is greater than the deviation ΔTwe of the end portion 1WE on the workpiece side (if the result of step S08A is YES), in step S09A1, the corrected deviation ΔTw=ΔTwc×Dwc / Dwe is obtained. Furthermore, in step S09A1, it is determined whether the corrected deviation ΔTw exceeds the threshold value Vw1.

[0074] When the corrected deviation ΔTw exceeds the threshold value Vw1 (when the result of step S09A1 is YES), in step S10A, the pressing pressure of the first pressure cylinder 51L is increased by a predetermined pressure, and the bending pressure of the first bending cylinder 61L is increased by a predetermined pressure. When the corrected deviation ΔTw does not exceed the threshold value Vw1 (when the result of step S09A1 is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (at the same pressure as the threshold value Vw1). Figure 5 , becomes the end).

[0075] Returning to step S08A, when the deviation ΔTwe of the end portion 1WE on the workpiece side is larger than the deviation ΔTwc of the first intermediate portion 1WC (when the result of step S08A is NO), in step S09A2, it is determined whether the deviation ΔTwe exceeds the threshold value Vw1.

[0076] When the deviation ΔTwe exceeds the threshold value Vw1 (if the result of step S09A2 is YES), in step S10A, the pressing pressure of the first pressure cylinder 51L is increased by a predetermined pressure, and the bending pressure of the first bending cylinder 61L is increased by a predetermined pressure. When the deviation ΔTwe does not exceed the threshold value Vw1 (if the result of step S09A2 is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (in step S10A). Figure 5 , becomes the end).

[0077] When the second control formula is used, in step S08B following step S07B, a deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side and a deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC are obtained. Furthermore, in step S08B, the deviation ΔTwe (absolute value) and the deviation ΔTwc (absolute value) are compared. Step S08B is the same as step S08A.

[0078] When the deviation ΔTwc of the first intermediate portion 1WC is greater than the deviation ΔTwe of the end portion 1WE on the workpiece side (when the result of step S08B is yes), in step S09B1, the corrected deviation ΔTw=ΔTwc×Dwc / Dwe is obtained. Further, in step S09B1, it is determined whether the corrected deviation ΔTw exceeds the threshold value Vw2. Step S09B1 is the same as step S09A1.

[0079] When the corrected deviation ΔTw exceeds the threshold value Vw2 (when the result of step S09B1 is YES), in step S10B, the pressing pressure of the first pressure cylinder 51L is reduced by a predetermined pressure, and the bending pressure of the first bending cylinder 61L is reduced by a predetermined pressure. Step S10B is opposite to step S10A in the direction of change of the pressing pressure and the bending pressure. When the corrected deviation ΔTw does not exceed the threshold value Vw2 (when the result of step S09B1 is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (when the result of step S09B1 is YES). Figure 5 , becomes the end).

[0080] Returning to step S08B, when the deviation ΔTwe of the end portion 1WE on the workpiece side is larger than the deviation ΔTwc of the first intermediate portion 1WC (when the result of step S08B is NO), in step S09B2, it is determined whether the deviation ΔTwe exceeds the threshold value Vw2.

[0081] When the deviation ΔTwe exceeds the threshold value Vw2 (when the result of step S09B2 is YES), in step S10B, the pressing pressure of the first pressure cylinder 51L is reduced by a predetermined pressure, and the bending pressure of the first bending cylinder 61L is reduced by a predetermined pressure. When the deviation ΔTwe does not exceed the threshold value Vw2 (when the result of step S09B2 is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (when the result of step S10B is YES). Figure 5 , becomes the end).

[0082] When the third control formula is used, in step S08C following step S07C, the deviation ΔTwe between the thickness Tc of the center portion 1C and the thickness Twe of the end portion 1WE on the workpiece side is calculated. In step S09C, it is determined whether the deviation ΔTwe exceeds the threshold value Vw3. When the deviation ΔTwe exceeds the threshold value Vw3 (when the result of step S09C is YES), in step S10C, the bending pressure of the first bending cylinder 61L is reduced by a predetermined pressure. When the deviation ΔTwe does not exceed the threshold value Vw3 (when the result of step S09C is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (when the result of step S09C is YES). Figure 5 , becomes the end).

[0083] When the fourth control formula is used, in step S08D following step S07D, the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side is calculated. Step S08D is the same as step S08C. In step S09D, it is determined whether the deviation ΔTwe exceeds the threshold value Vw4. When the deviation ΔTwe exceeds the threshold value Vw4 (when the result of step S09D is YES), in step S10D, the bending pressure of the first bending cylinder 61L is increased to a predetermined pressure. When the deviation ΔTwe does not exceed the threshold value Vw4 (when the result of step S09D is NO), the pressing pressure of the first pressure cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (when the result of step S09D is NO). Figure 5 , becomes the end).

[0084] The thickness control on the drive side is also performed in the same manner as on the workpiece side, so illustration and description in the flowchart are omitted.

[0085] [Effects of the Embodiments]

[0086] Hereinafter, the effects that can be achieved by the electrode rolling device 10 according to the present embodiment will be described.

[0087] The electrode rolling device 10 according to the present embodiment includes a conveying device 20 for conveying a strip-shaped electrode sheet 1 having an electrode active material layer 3 formed thereon along a predetermined conveying path, a roller press 30 for rolling the electrode sheet 1 arranged on the conveying path, and a control device 100 . The roller press 30 includes a pair of calendering rollers 31, 32 for clamping the electrode sheet 1, a first gap adjustment mechanism 50L for adjusting the gap between the pair of calendering rollers 31, 32 on the workpiece side in the width direction of the calendering rollers 31, 32, a second gap adjustment mechanism 50R for adjusting the gap between the pair of calendering rollers 31, 32 on the drive side in the width direction of the calendering rollers 31, 32, a first bending mechanism 60L for correcting the deflection of the pair of calendering rollers 31, 32 on the workpiece side of the calendering rollers 31, 32, and a second bending mechanism 60R for correcting the deflection of the pair of calendering rollers 31, 32 on the drive side of the calendering rollers 31, 32. The control device 100 obtains the thickness Tc of the central portion 1C in the width direction, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the drive side, the thickness Twc of the first intermediate portion 1WC set between the central portion 1C and the end portion 1WE on the workpiece side, and the thickness Tdc of the second intermediate portion 1DC set between the central portion 1C and the end portion 1DE on the drive side in the electrode sheet 1. The control device 100 obtains the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side, and the deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC, and obtains the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the drive side, and the deviation ΔTdc between the thickness Tc of the central portion 1C and the thickness Tdc of the second intermediate portion 1DC. The control device 100 controls the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R so as to reduce the larger deviation between the deviation ΔTwe and the deviation ΔTwc and the larger deviation between the deviation ΔTde and the deviation ΔTdc.

[0088] According to the electrode rolling device 10, the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R are controlled so as to reduce the larger deviation of the deviation ΔTwe between the thickness Tc of the central portion 1C in the width direction of the electrode sheet 1 and the thickness Twe of the end portion 1WE on the workpiece side, and the deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC, or the larger deviation of the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the end portion 1DE on the drive side, and the deviation ΔTdc between the thickness Tc of the central portion 1C and the thickness Tdc of the second intermediate portion 1DC. Therefore, even when the thickness of the first intermediate portion 1WC or the second intermediate portion 1DC is thicker or thinner due to undulation, the difference in thickness of the electrode sheet 1 based on the position in the width direction can be reduced.

[0089] Figure 7 This is a graph showing the maximum variation in thickness of the electrode sheet 1 . Figure 7 The vertical axis represents the maximum deviation in thickness of the electrode sheet 1 . Figure 7 The horizontal axis of represents the position where the thickness deviation of the electrode sheet 1 is the largest. Figure 7 In FIG. 1 , the conventional control indicated by a circle is a control in which the result of control based on the same control equation as control equations 3, 4, 7, and 8 is plotted. Figure 7 In FIG. 1 , the control represented by a square is a control in which the result of control by the control method according to the present embodiment is plotted. Figure 7 As shown, according to the control method of this embodiment, the maximum variation of the thickness of the electrode sheet 1 is reduced compared with the conventional control. That is, the difference in thickness is suppressed.

[0090] In the present embodiment, the control device 100 stores the first to fourth control formulas. The first control formula is a control formula for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L when Twc>Tc and Twc>Twe. The second control formula is a control formula for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L when Twc<Tc and Twc<Twe. The third control formula is a control formula for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L when Tc≦Twc≦Twe. The fourth control formula is a control formula for obtaining control values ​​for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L when Tc≧Twc≧Twe.

[0091] According to this structure, four control formulas can be used respectively according to four modes of thickness difference on the workpiece side. Thus, even if the mode of thickness difference on the workpiece side is one of the four modes, the difference in thickness of the electrode sheet 1 based on the position in the width direction can be reduced. The same is true for the drive side.

[0092] In the present embodiment, the first bending mechanism 60L is configured to change the gap between the pair of rolling rollers 31 and 32 at the end 1WE on the workpiece side. The first control formula is configured to set the distance in the width direction between the central portion 1C and the end 1WE on the workpiece side as Dwe, and the distance in the width direction between the central portion 1C and the first intermediate portion 1WC as Dwc, and when the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold value Vw1, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw1, the control value of the first gap adjustment mechanism 50L is set so that the gap between the pair of rolling rollers 31 and 32 on the workpiece side is narrowed, and the control value of the first bending mechanism 60L is set so that the gap between the pair of rolling rollers 31 and 32 on the workpiece side is widened.

[0093] According to this configuration, the larger deviation of the deviation ΔTwe and the deviation ΔTwc is compared with the threshold value Vw1. As a result, the control works in a manner to correct the larger deviation of the deviation ΔTwe and the deviation ΔTwc, and the difference in thickness of the electrode sheet 1 based on the position in the width direction can be reduced. When the deviation ΔTwc of the first middle portion 1WC is larger than the deviation ΔTwe of the end portion 1WE, the deviation ΔTw=ΔTwc×Dwc / Dwe obtained by correcting the deviation ΔTwc of the first middle portion 1WC is compared with the threshold value Vw1. The corrected deviation ΔTw represents the amount of deflection of the first middle portion 1WC when the end portion 1WE is deflected. By using the corrected deviation ΔTw, the amount of change in the bending pressure of the first bending mechanism 60L can be appropriately obtained. The same is true for the driving side.

[0094] In the present embodiment, the second control formula is constructed as follows: when the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds the predetermined threshold value Vw2, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw2, the control value of the first gap adjustment mechanism 50L is set so as to widen the gap between a pair of rolling rollers 31 and 32 on the workpiece side, and the control value of the first bending mechanism 60L is set so as to narrow the gap between the pair of rolling rollers 31 and 32 at the end 1WE on the workpiece side.

[0095] According to this configuration, the thickness correction direction is opposite to that in the first control formula, but the same operation and effect as in the first control formula can be achieved. The same is true for the driving side.

[0096] In the present embodiment, when the conveying speed V of the electrode sheet 1 conveyed by the conveying device 20 is equal to or higher than a predetermined threshold speed Vv, the control device 100 controls the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R so that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller. In addition, when the conveying speed V of the electrode sheet 1 conveyed by the conveying device 20 is less than the threshold speed Vv, the control device 100 maintains the control values ​​of the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R.

[0097] According to the inventors' knowledge, when the conveying speed V of the electrode sheet 1 is slow, the electrode sheet 1 is sufficiently rolled and the thickness difference of the electrode sheet 1 is small. According to the above configuration, when the conveying speed V of the electrode sheet 1 is slower than the threshold speed Vv, the thickness difference control can be omitted.

[0098] The electrode rolling device 10 involved in this embodiment is provided with a downstream thickness measuring device 80 for measuring the thickness Tc of the central portion 1C of the rolled electrode sheet 1, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first middle portion 1WC, and the thickness Tdc of the second middle portion 1DC at a position downstream of the roller press 30 in the conveying path.

[0099] According to this structure, the control device 100 can obtain the thickness Tc of the central portion 1C of the rolled electrode sheet 1, the thickness Twe of the end portion 1WE on the workpiece side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first middle portion 1WC, and the thickness Tdc of the second middle portion 1DC.

[0100] The electrode rolling device 10 according to the present embodiment is provided with an upstream side thickness measuring device 70 for measuring the thickness Tc0 of the central portion 1C, the thickness Twe0 of the end portion 1WE on the workpiece side, the thickness Tde0 of the end portion 1DE on the driving side, the thickness Twc0 of the first intermediate portion 1WC, and the thickness Tdc0 of the second intermediate portion 1DC of the electrode sheet 1 before rolling, at a position upstream of the roller press 30 in the conveying path. The control device 100 sets initial control values ​​of the first gap adjustment mechanism 50L, the second gap adjustment mechanism 50R, the first bending mechanism 60L, and the second bending mechanism 60R based on the thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0.

[0101] According to this configuration, feedback control related to rolling of a new electrode sheet 1 is stabilized, and the time until the difference in thickness of the electrode sheet 1 falls within the allowable range can be shortened. As a result, the amount of electrode sheet 1 wasted in feedback control can be reduced.

[0102] [Other embodiments]

[0103] In the above, one embodiment of the rolling device for the electrode sheet proposed here is described. However, the above embodiment is only an example and can also be implemented in other ways. For example, in the above embodiment, the thickness of 5 points in the width direction of the electrode sheet is measured, and the thickness difference control is performed based on the measured thickness of the 5 points. However, the number of points where the thickness is measured and the thickness difference control is performed based on the measured value can also be 6 or more.

[0104] In the above embodiment, feedforward control based on the thickness measurement of the electrode sheet before rolling is performed, but feedforward control may not be performed. In the above embodiment, feedback control is not performed when the conveying speed of the electrode sheet is slow, but feedback control may be performed. In this case, the control formula may also be changed according to the conveying speed of the electrode sheet. For example, the control formula at this time may also be a control formula that continuously or stagewise reduces the change in the pressing pressure of the gap adjustment mechanism and the bending pressure of the bending mechanism as the conveying speed of the electrode sheet slows down.

[0105] In addition, the above embodiments do not limit the present invention except for the cases specifically mentioned. In addition, the technology disclosed herein can be modified in various ways, and each component and each process mentioned herein can be appropriately omitted or appropriately combined unless a special problem occurs.

[0106] This specification includes the disclosure described in the following items.

[0107] Item 1:

[0108] An electrode rolling device, comprising:

[0109] A conveying device that conveys a strip-shaped electrode sheet having an electrode active material layer formed thereon along a predetermined conveying path;

[0110] a calendering device, disposed on the conveying path, for calendering the electrode sheet; and

[0111] Control device,

[0112] The calendering device comprises:

[0113] A pair of calendering rollers clamping the electrode sheet;

[0114] a first gap adjustment mechanism for adjusting the gap between the pair of calendering rollers at a first side in the width direction of the pair of calendering rollers;

[0115] A second gap adjustment mechanism for adjusting the gap between the pair of calendering rollers at a second side in the width direction of the pair of calendering rollers;

[0116] a first bending mechanism for correcting the deflection of the pair of calender rolls at the first side in the width direction of the pair of calender rolls; and

[0117] a second bending mechanism for correcting the deflection of the pair of calendering rolls at the second side in the width direction of the pair of calendering rolls;

[0118] The control device obtains the thickness Tc of the central portion in the width direction of the electrode sheet, the thickness Twe of the end portion on the first side, the thickness Tde of the end portion on the second side, the thickness Twc of the first intermediate portion set between the central portion and the end portion on the first side, and the thickness Tdc of the second intermediate portion set between the central portion and the end portion on the second side,

[0119] The control device obtains a deviation ΔTwe between the thickness Tc of the central portion and the thickness Twe of the first end portion, and a deviation ΔTwc between the thickness Tc of the central portion and the thickness Twc of the first intermediate portion, and

[0120] The deviation ΔTde between the thickness Tc of the central portion and the thickness Tde of the second end portion and the deviation ΔTdc between the thickness Tc of the central portion and the thickness Tdc of the second intermediate portion are obtained.

[0121] The control device controls the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism so that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller.

[0122] Item 2:

[0123] In the electrode rolling device described in item 1,

[0124] The control device stores:

[0125] a first control formula, which is used when Twc>Tc and Twc>Twe, and which obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism;

[0126] a second control equation, which is used when Twc<Tc and Twc<Twe, and which obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism;

[0127] a third control equation, which is used when Tc≦Twc≦Twe and obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism; and

[0128] The fourth control equation is used when Tc≧Twc≧Twe, and obtains control values ​​for controlling the first gap adjustment mechanism and the first bending mechanism.

[0129] Item 3:

[0130] In the electrode rolling device described in item 2,

[0131] The first bending mechanism is configured to change the gap between the pair of calendering rollers at the end portion on the first side.

[0132] The first control formula is as follows:

[0133] The distance between the central portion and the first side end in the width direction is defined as Dwe.

[0134] The distance between the central portion and the first intermediate portion in the width direction is defined as Dwc.

[0135] When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the above threshold, the control value of the first gap adjustment mechanism is set in such a way that the gap between the above pair of calendering rollers on the above first side is narrowed, and the control value of the first bending mechanism is set in such a way that the gap between the above pair of calendering rollers at the end portions of the above first side is widened.

[0136] Item 4:

[0137] In the electrode rolling device described in item 2 or 3,

[0138] The first bending mechanism is configured to change the gap between the pair of calendering rollers at the end portion on the first side.

[0139] The second control formula is as follows:

[0140] The distance between the central portion and the first side end in the width direction is defined as Dwe.

[0141] The distance between the central portion and the first intermediate portion in the width direction is defined as Dwc.

[0142] When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the above threshold, the control value of the first gap adjustment mechanism is set in such a way that the gap between the above pair of calendering rollers on the above first side is widened, and the control value of the first bending mechanism is set in such a way that the gap between the above pair of calendering rollers at the end portions of the above first side is narrowed.

[0143] Item 5:

[0144] In the electrode rolling device described in any one of items 1 to 4,

[0145] The control device stores:

[0146] a fifth control formula, which is used when Tdc>Tc and Tdc>Tde, and which obtains control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism;

[0147] a sixth control formula, which is used when Tdc<Tc and Tdc<Tde, and which obtains a control value for controlling the second gap adjustment mechanism and the second bending mechanism;

[0148] a seventh control equation, which is used when Tc≦Tdc≦Tde and which calculates control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism; and

[0149] The eighth control equation is used when Tc≧Tdc≧Tde, and obtains control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism.

[0150] Item 6:

[0151] In the electrode rolling device described in item 5,

[0152] The second bending mechanism is configured to change the gap between the pair of calendering rollers at the end portion on the second side.

[0153] The fifth control formula is as follows:

[0154] The distance between the central portion and the second side end in the width direction is defined as Dde.

[0155] The distance between the central portion and the second intermediate portion in the width direction is defined as Ddc.

[0156] When the deviation ΔTdc is greater than the deviation ΔTde, when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the above threshold, the control value of the second gap adjustment mechanism is set in such a way that the gap between the above pair of calendering rollers on the above second side is narrowed, and the control value of the second bending mechanism is set in such a way that the gap between the above pair of calendering rollers at the end portions of the above second side is widened.

[0157] Item 7:

[0158] In the electrode rolling device described in item 5 or 6,

[0159] The second bending mechanism is configured to change the gap between the pair of calendering rollers at the end portion on the second side.

[0160] The sixth control formula is as follows:

[0161] The distance between the central portion and the second side end in the width direction is defined as Dde.

[0162] The distance between the central portion and the second intermediate portion in the width direction is defined as Ddc.

[0163] When the deviation ΔTdc is greater than the deviation ΔTde, when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the above threshold, the control value of the second gap adjustment mechanism is set in such a way that the gap between the above pair of calendering rollers on the above second side is widened, and the control value of the second bending mechanism is set in such a way that the gap between the above pair of calendering rollers at the end portions of the above second side is narrowed.

[0164] Item 8:

[0165] In the electrode rolling device described in any one of items 1 to 7,

[0166] When the conveying speed of the electrode sheet by the conveying device is above a predetermined threshold speed, the control device controls the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism in such a manner that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller,

[0167] The control device maintains control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism when a conveying speed of the electrode sheet by the conveying device is lower than the threshold speed.

[0168] Item 9:

[0169] In the electrode rolling device described in any one of items 1 to 8,

[0170] A first thickness measuring device is further provided at a position downstream of the calendering device in the conveying path, and the first thickness measuring device measures the thickness Tc of the central portion of the electrode sheet after calendering, the thickness Twe of the end portion of the first side, the thickness Tde of the end portion of the second side, the thickness Twc of the first middle portion, and the thickness Tdc of the second middle portion.

[0171] Item 10:

[0172] In the electrode rolling device described in any one of items 1 to 9,

[0173] A second thickness measuring device is further provided at a position upstream of the calendering device in the conveying path, and the second thickness measuring device measures the thickness Tc0 of the central portion of the electrode sheet before calendering, the thickness Twe0 of the end portion on the first side, the thickness Tde0 of the end portion on the second side, the thickness Twc0 of the first middle portion, and the thickness Tdc0 of the second middle portion,

[0174] The control device sets initial control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism based on the thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0.

Claims

1. An electrode rolling device, characterized in that: have: A conveying device that conveys a strip-shaped electrode sheet having an electrode active material layer formed thereon along a predetermined conveying path; a calendering device, disposed on the conveying path, for calendering the electrode sheet; and Control device, The calendering device comprises: A pair of calendering rollers clamping the electrode sheet; a first gap adjustment mechanism for adjusting the gap between the pair of calender rolls at a first side in the width direction of the pair of calender rolls; A second gap adjustment mechanism for adjusting the gap between the pair of calender rolls at a second side in the width direction of the pair of calender rolls; a first bending mechanism for correcting the deflection of the pair of calendering rollers at the first side in the width direction of the pair of calendering rollers; as well as a second bending mechanism for correcting the deflection of the pair of calendering rolls at the second side in the width direction of the pair of calendering rolls, The control device obtains the thickness Tc of the central portion in the width direction of the electrode sheet, the thickness Twe of the end portion on the first side, the thickness Tde of the end portion on the second side, the thickness Twc of the first intermediate portion set between the central portion and the end portion on the first side, and the thickness Tdc of the second intermediate portion set between the central portion and the end portion on the second side, The control device obtains a deviation ΔTwe between the thickness Tc of the central portion and the thickness Twe of the first end portion, and a deviation ΔTwc between the thickness Tc of the central portion and the thickness Twc of the first intermediate portion, and A deviation ΔTde between the thickness Tc of the central portion and the thickness Tde of the second end portion, and a deviation ΔTdc between the thickness Tc of the central portion and the thickness Tdc of the second intermediate portion are obtained. The control device controls the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism so that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller.

2. The electrode rolling device according to claim 1, characterized in that: The control device stores: a first control formula, which is used when Twc>Tc and Twc>Twe, and which obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism; a second control equation, which is used when Twc<Tc and Twc<Twe, and which obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism; a third control equation, which is used when Tc≦Twc≦Twe and obtains a control value for controlling the first gap adjustment mechanism and the first bending mechanism; and The fourth control equation is used when Tc≧Twc≧Twe, and obtains control values ​​for controlling the first gap adjustment mechanism and the first bending mechanism.

3. The electrode rolling device according to claim 2, characterized in that: The first bending mechanism is configured to change the gap between the pair of calender rollers at the end portion on the first side. The first control formula is composed of: The distance between the central portion and the end portion on the first side in the width direction is defined as Dwe. The distance between the central portion and the first intermediate portion in the width direction is defined as Dwc. When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold, the control value of the first gap adjustment mechanism is set in such a way that the gap between the pair of calendering rollers on the first side is narrowed, and the control value of the first bending mechanism is set in such a way that the gap between the pair of calendering rollers at the ends of the first side is widened.

4. The electrode rolling device according to claim 2, characterized in that: The first bending mechanism is configured to change the gap between the pair of calender rollers at the end portion on the first side. The second control formula is composed of: The distance between the central portion and the end portion on the first side in the width direction is defined as Dwe. The distance between the central portion and the first intermediate portion in the width direction is defined as Dwc. When the deviation ΔTwc is greater than the deviation ΔTwe, when the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold, or when the deviation ΔTwe is greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold, the control value of the first gap adjustment mechanism is set in such a way that the gap between the pair of calendering rollers on the first side is widened, and the control value of the first bending mechanism is set in such a way that the gap between the pair of calendering rollers at the end portions of the first side is narrowed.

5. The electrode rolling device according to claim 1, characterized in that: The control device stores: a fifth control equation, which is used when Tdc>Tc and Tdc>Tde, and which obtains control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism; a sixth control equation, which is used when Tdc<Tc and Tdc<Tde, and which obtains a control value for controlling the second gap adjustment mechanism and the second bending mechanism; a seventh control equation, which is used when Tc≦Tdc≦Tde and which obtains control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism; and The eighth control equation is used when Tc≧Tdc≧Tde, and obtains control values ​​for controlling the second gap adjustment mechanism and the second bending mechanism.

6. The electrode rolling device according to claim 5, characterized in that: The second bending mechanism is configured to change the gap between the pair of calender rollers at the end portion on the second side. The fifth control formula is composed of: The distance between the central portion and the second end portion in the width direction is defined as Dde. The distance between the central portion and the second intermediate portion in the width direction is defined as Ddc. When the deviation ΔTdc is greater than the deviation ΔTde, when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the threshold, the control value of the second gap adjustment mechanism is set in such a way that the gap between the pair of calendering rollers on the second side is narrowed, and the control value of the second bending mechanism is set in such a way that the gap between the pair of calendering rollers at the end portions of the second side is widened.

7. The electrode rolling device according to claim 5, characterized in that: The second bending mechanism is configured to change the gap between the pair of calender rollers at the end portion on the second side. The sixth control formula is constructed as follows: The distance between the central portion and the second end portion in the width direction is defined as Dde. The distance between the central portion and the second intermediate portion in the width direction is defined as Ddc. When the deviation ΔTdc is greater than the deviation ΔTde, when the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold, or when the deviation ΔTde is greater than the deviation ΔTdc and the deviation ΔTde exceeds the threshold, the control value of the second gap adjustment mechanism is set in such a way that the gap between the pair of calendering rollers on the second side is widened, and the control value of the second bending mechanism is set in such a way that the gap between the pair of calendering rollers at the end portions of the second side is narrowed.

8. The electrode rolling device according to claim 1, characterized in that: The control device controls the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism in such a manner that the larger deviation of the deviation ΔTwe and the deviation ΔTwc and the larger deviation of the deviation ΔTde and the deviation ΔTdc become smaller when the conveying speed of the electrode sheet by the conveying device is greater than a predetermined threshold speed. The control device maintains control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism when a conveying speed of the electrode sheet by the conveying device is lower than the threshold speed.

9. The electrode rolling device according to claim 1, characterized in that: A first thickness measuring device is further provided at a position downstream of the calendering device in the conveying path. The first thickness measuring device measures the thickness Tc of the central portion of the electrode sheet after calendering, the thickness Twe of the end portion of the first side, the thickness Tde of the end portion of the second side, the thickness Twc of the first middle portion, and the thickness Tdc of the second middle portion.

10. The electrode rolling device according to claim 1, characterized in that: A second thickness measuring device is further provided at a position upstream of the calendering device in the conveying path, and the second thickness measuring device measures the thickness Tc0 of the central portion of the electrode sheet before calendering, the thickness Twe0 of the end portion on the first side, the thickness Tde0 of the end portion on the second side, the thickness Twc0 of the first middle portion, and the thickness Tdc0 of the second middle portion, The control device sets initial control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism based on the thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0.

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