Electrode rolling device

Abstract

To provide an electrode rolling device capable of reducing variation in thickness of an electrode sheet depending on the position in a width direction.SOLUTION: An electrode rolling device acquires the thickness Tc of a central portion 1C in a width direction, the thickness Twe of an end portion 1WE on a first side, the thickness Tde of an end portion 1DE on a second side, the thickness Twc of a first intermediate portion 1WC set between the central portion 1C and the end portion 1WE on the first side, and the thickness Tdc of a second intermediate portion 1DC set between the central portion 1C and the end portion 1DE on the second side for an electrode sheet 1. The electrode rolling device acquires the deviation ΔTwe between the thickness Tc and the thickness Twe, and the deviation ΔTwc between the thickness Tc and the thickness Twc, and also acquires the deviation ΔTde between the thickness Tc and the thickness Tde, and the deviation ΔTdc between the thickness Tc and the thickness Tdc, and performs control so as to reduce the larger one of the deviation ΔTwe and the deviation ΔTwc and the larger one of the deviation ΔTde and the deviation ΔTdc.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an electrode rolling device. [Background technology]

[0002] For example, Patent Document 1 discloses a roll press machine for rolling materials such as electrode materials for lithium-ion secondary batteries. The roll press machine described in Patent Document 1 includes an upper roll and a lower roll, a press cylinder that generates a press load between the upper roll and the lower roll, a roll drive mechanism, a bend cylinder that corrects the deflection of the rolls, and a thickness gauge that measures the thickness of the material at three points: the center of the material in the width direction, the roll drive mechanism side (drive side), and the side without the roll drive mechanism (operation side). The roll press machine described in Patent Document 1 is configured to perform feedback control of the press cylinder and the bend cylinder alone or in combination when the difference in material thickness from the target thickness falls outside a threshold. In detail, the roll press machine described in Patent Document 1 controls the press pressure of the press cylinder when the material thickness on the drive side or the operation side falls outside the threshold, and controls the bend pressure of the bend cylinder when the material thickness on the drive side and the operation side is within the threshold and the material thickness at the center falls outside the threshold.

[0003] Patent Document 2 also discloses a roll press device having a similar configuration to the roll press device of Patent Document 1. The roll press device described in Patent Document 2 is configured to calculate the difference between the thickness target value and the thickness measurement value on the driving side, the difference between the thickness target value and the thickness measurement value on the operating side, and the difference between the center thickness measurement value and the average of the thickness measurement values ​​on the driving side and the operating side. The roll press device described in Patent Document 2 applies the above calculated three differences to a predetermined calculation formula, and sets the pressures of the press cylinder on the driving side, the press cylinder on the operating side, the bend cylinder on the driving side, and the bend cylinder on the operating side.

[0004] The roll press device described in Patent Document 3 is configured to calculate the difference between the thickness target value and the thickness measurement value at the center, the difference between the center thickness measurement value and the average of the thickness measurements at the driving side and the operating side, and the difference between the thickness measurement value at the driving side and the thickness measurement value at the operating side. The roll press device described in Patent Document 3 applies the above calculated three differences to a predetermined calculation formula, and sets the pressures of the press cylinder at the driving side, the press cylinder at the operating side, the bend cylinder at the driving side, and the bend cylinder at the operating side. According to Patent Document 3, such control can improve the accuracy of the thickness control of the roll press device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5328876 [Patent Document 2] International Publication No. 2021 / 140747 [Patent Document 3] International Publication No. 2020 / 100561 Summary of the Invention [Problem to be solved by the invention]

[0006] The roll press devices described in Patent Documents 1 to 3 perform control assuming that the thickness of the electrode sheet changes gradually so that the central portion is convex or concave. However, the thickness of the electrode sheet may change in an undulating manner along the width direction. Here, we propose an electrode rolling device that can reduce the variation in thickness of the electrode sheet depending on the position in the width direction even when the electrode sheet is undulating along the width direction. [Means for solving the problem]

[0007] The electrode rolling device disclosed herein includes a conveying device that conveys a strip-shaped electrode sheet on which an electrode active material layer is formed along a predetermined conveying path, a rolling device that is disposed on the conveying path and rolls the electrode sheet, and a control device. The rolling device includes a pair of rolling rolls that sandwich the electrode sheet, a first gap adjustment mechanism that adjusts the gap between the pair of rolling rolls on a first side in the width direction of the pair of rolling rolls, a second gap adjustment mechanism that adjusts the gap between the pair of rolling rolls on a second side in the width direction of the pair of rolling rolls, a first bending mechanism that corrects deflection of the pair of rolling rolls on the first side in the width direction of the pair of rolling rolls, and a second bending mechanism that corrects deflection of the pair of rolling rolls on the second side in the width direction of the pair of rolling rolls. The control device acquires the thickness Tc of the center 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 a first intermediate portion set between the center portion and the end portion on the first side, and the thickness Tdc of a second intermediate portion set between the center portion and the end portion on the second side. The control device obtains the deviation ΔTwe between the thickness Tc of the center portion and the thickness Twe of the end portion on the first side, and the deviation ΔTwc between the thickness Tc of the center portion and the thickness Twc of the first intermediate portion, and obtains the deviation ΔTde between the thickness Tc of the center portion and the thickness Tde of the end portion on the second side, and the deviation ΔTdc between the thickness Tc of the center 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 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.

[0008] 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 to reduce the larger 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 intermediate portion, and to reduce the larger 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 intermediate portion. Therefore, even if the thickness of the first intermediate portion or the second intermediate portion is thick or thin due to waviness, the variation in thickness of the electrode sheet depending on the position in the width direction can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic side view of an electrode rolling device. [Diagram 2] FIG. 2 is a schematic front view of an electrode rolling device. [Diagram 3] FIG. 2 is a schematic plan view of an electrode rolling device. [Figure 4] FIG. 2 is a control block diagram of the electrode rolling device. [Diagram 5] 10 is a flowchart showing a flow of feedback control of the thickness of an electrode sheet. [Figure 6] FIG. 4 is a schematic diagram showing a thickness distribution pattern depending on the position in the width direction of the electrode sheet. [Figure 7] 1 is a graph showing the maximum deviation in thickness of an electrode sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, one embodiment of an electrode rolling apparatus for an electric storage device will be described. Note that the embodiment described here is, of course, not intended to limit the present invention in particular. Also, each figure is a schematic diagram and does not necessarily faithfully reflect an actual implementation.

[0011] [Configuration of electrode rolling equipment] FIG. 1 is a schematic side view of an electrode rolling apparatus 10 according to an embodiment. FIG. 2 is a schematic front view of the electrode rolling apparatus 10. FIG. 3 is a schematic plan view of the electrode rolling apparatus 10. The electrode rolling apparatus 10 rolls a strip-shaped electrode sheet 1 on which an electrode active material layer 3 is formed, and forms the electrode sheet 1 into a thickness within a predetermined range. The electrode sheet 1 here is an electrode sheet for a lithium-ion secondary battery. However, the electrode sheet 1 is not limited to an electrode sheet for a lithium-ion secondary battery, and may be an electrode sheet for various known electricity storage devices. The term electricity storage device refers to devices in general that can extract electric energy, and includes so-called storage batteries (chemical batteries) such as lithium-ion secondary batteries and nickel-metal hydride batteries, and capacitors (physical batteries) such as electric double layer capacitors.

[0012] As shown in FIG. 3, the electrode sheet 1 includes a strip-shaped current collector foil 2 and an electrode active material layer 3 formed on the current collector foil 2. The portion of the current collector foil 2 where the electrode active material layer 3 is not formed constitutes an unformed portion 4. The positive electrode sheet is a member in which a positive electrode active material layer 3 containing a positive electrode active material is formed on the surface of a strip-shaped current collector foil 2 (e.g., aluminum foil) having a predetermined width and thickness. In a lithium-ion secondary battery, the positive electrode active material is, for example, a material that can release lithium ions during charging and absorb lithium ions during discharging, such as a lithium transition metal composite material. 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 member in which a negative electrode active material layer 3 containing a negative electrode active material is formed on the surface of a strip-shaped current collector foil 2 (e.g., copper foil) having a predetermined width and thickness. The negative electrode active material is, for example, a material that can absorb lithium ions during charging and release the absorbed lithium ions during discharging, such as natural graphite, in a lithium ion secondary battery. Various positive electrode active materials and negative electrode active materials have been proposed other than the above-mentioned materials, and are not particularly limited.

[0013] 1, the electrode rolling apparatus 10 includes a conveying device 20, a roll press machine 30, an upstream thickness measuring device 70, a downstream thickness measuring device 80, and a control device 100. The electrode rolling apparatus 10 may also include an inspection device or the like, but description and illustration thereof will be omitted here.

[0014] The conveying device 20 conveys the electrode sheet 1 in the longitudinal direction along a predetermined conveying path. Here, the conveying device 20 is disposed at the most downstream side of the electrode rolling device 10, and includes a winding device 21 that winds up the electrode sheet 1 after rolling. The strip-shaped electrode sheet 1 is conveyed in the longitudinal direction by being wound by the winding device 21. The conveying device 20 is configured to be capable of measuring and adjusting the speed at which the electrode sheet 1 is conveyed. The winding device 21 is provided with an encoder 22 that reads a rotation angle. The speed at which the electrode sheet 1 is conveyed is calculated from the rotation angle of the winding device 21 read by the encoder 22. The winding device 21 is configured to be capable of controlling the rotation speed. However, the configuration of the conveying device 20 is not limited to that described above.

[0015] The roll press machine 30 is disposed on the transport path of the electrode sheet 1. The roll press machine 30 rolls the electrode sheet 1. As shown in FIG. 2, the roll press machine 30 includes a pair of rolling rolls 31, 32 that sandwich the electrode sheet 1. Here, the pair of rolling rolls 31, 32 includes an upper roll 31 and a lower roll 32. The upper roll 31 and the lower roll 32 are each configured in a cylindrical shape and extend in the width direction of the electrode sheet 1. In the following, for convenience, the width direction of the electrode sheet 1 (the left-right direction in FIG. 2) is also referred to as the left-right direction, and the left and right sides in FIG. 2 are also referred to as the left and right sides of the roll press machine 30.

[0016] The upper roll 31 is supported by a left bearing 33L and a right bearing 33R so as to be rotatable in the front-rear direction. The lower roll 32 is supported by a left bearing 34L and a right bearing 34R so as to be rotatable in the front-rear direction. The roll press machine 30 includes an upper roll rotating device 41 that rotates the upper roll 31 in the front-rear direction, and a lower roll rotating device 42 that rotates the lower roll 32 in the front-rear direction. The upper roll rotating device 41 is configured to be able to control the rotation speed of the upper roll 31. The lower roll rotating device 42 is configured to be able to control the rotation speed of the lower roll 32. Hereinafter, the side where the upper roll rotating device 41 and the lower roll rotating device 42 are arranged in the extension direction (width direction of the electrode sheet 1) of the rolling rolls 31 and 32 is also referred to as the drive side, and the opposite side is also referred to as the work side. In this embodiment, the drive side is the right side, and the work side is the left side.

[0017] As shown in FIG. 2, the roll press machine 30 includes a first gap adjustment mechanism 50L that adjusts the gap between the pair of rolls 31, 32 on the work side of the pair of rolls 31, and a second gap adjustment mechanism 50R that adjusts the gap between the pair of rolls 31, 32 on the drive side of the pair of rolls 31, 32. The roll press machine 30 further includes a first bending mechanism 60L that corrects the deflection of the pair of rolls 31, 32 on the work side of the pair of rolls 31, 32, and a second bending mechanism 60R that corrects the deflection of the pair of rolls 31, 32 on the drive side of the pair of rolls 31, 32. The work side is an example of a first side in the width direction of the electrode sheet 1. The drive side is an example of a second side in the width direction of the electrode sheet 1.

[0018] As shown in FIG. 2, in this embodiment, the first gap adjustment mechanism 50L includes a first press cylinder 51L that moves the left bearing 34L of the lower roll 32 in the vertical direction. The first press cylinder 51L generates a press load between the work side portion of the upper roll 31 and the work side portion of the lower roll 32. The first gap adjustment mechanism 50L adjusts the gap on the work side of the pair of rolling rolls 31, 32 by adjusting the press load. The second gap adjustment mechanism 50R includes a second press cylinder 51R that moves the right bearing 34R of the lower roll 32 in the vertical direction. The second press cylinder 51R generates a press load between the drive side portion of the upper roll 31 and the drive side portion of the lower roll 32. The second gap adjustment mechanism 50R adjusts the gap on the drive side of the pair of rolling rolls 31, 32 by adjusting the press load.

[0019] The first bending mechanism 60L includes a first bending cylinder 61L that applies a force between the work-side portion of the upper roll 31 and the work-side portion of the lower roll 32 in a direction that moves them away from each other. By adjusting the force of the first bending cylinder 61L, the deflection of the work-side portion of the upper roll 31 and the work-side portion of the lower roll 32 can be corrected or deflected. The first bending mechanism 60L is configured to change the gap between the pair of rolling rolls 31, 32 at the end on the work side. The roll press machine 30 includes a left bending bearing 35L that is arranged to the left of the left bearing 33L of the upper roll 31 and rotatably supports the upper roll 31, and a right bending bearing 35R that is arranged to the right of the right bearing 33R and rotatably supports the upper roll 31. The roll press machine 30 also includes a left bend bearing 36L that is disposed to the left of the left bearing 34L of the lower roll 32 and rotatably supports the lower roll 32, and a right bend bearing 36R that is disposed to the right of the right bearing 34R and rotatably supports the lower roll 32. The first bend cylinder 61L is configured to apply a force to the left bend bearing 35L of the upper roll 31 and the left bend bearing 36L of the lower roll 32 in a direction that moves them apart.

[0020] The second bending mechanism 60R includes a second bending cylinder 61R that applies a load between the driving side portion of the upper roll 31 and the driving side portion of the lower roll 32 in a direction that moves them apart from each other. By adjusting the load of the second bending cylinder 61R, it is possible to correct the deflection of the driving side portion of the upper roll 31 and the driving side portion of the lower roll 32 or to deflect them. The second bending mechanism 60R is configured to change the gap between the pair of rolling rolls 31, 32 at the end of the driving side. The second bending cylinder 61R is configured to apply a force to the right bend bearing 35R of the upper roll 31 and the right bend bearing 36R of the lower roll 32 in a direction that moves them apart.

[0021] As shown in FIG. 3, the upstream thickness measuring device 70 measures the thickness of the electrode sheet 1 upstream of the roll press machine 30 in the conveying path. The upstream thickness measuring device 70 measures the thickness of the electrode sheet 1 before rolling by the roll press machine 30. The upstream thickness measuring device 70 measures the thickness of the electrode sheet 1 at five different positions in the width direction. 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 1WE on the work side, the thickness Tde0 of the end 1DE on the driving side, the thickness Twc0 of the first intermediate portion 1WC set between the central portion 1C and the end 1WE on the work side, and the thickness Tdc0 of the second intermediate portion 1DC set between the central portion 1C and the end 1DE on the driving side (see FIG. 6 for all of these, but only the [first pattern] in FIG. 6 is shown in parentheses). Here, the upstream thickness measuring device 70 includes five non-contact displacement sensors 71 provided above the central portion 1C, the end portion 1WE on the work side, the end portion 1DE on the driving side, the first intermediate portion 1WC, and the second intermediate portion 1DC of the electrode sheet 1. However, the configuration of the upstream thickness measuring device 70 is not particularly limited.

[0022] As shown in FIG. 3, the downstream thickness measuring device 80 measures the thickness of the electrode sheet 1 downstream of the roll press machine 30 in the conveying path. The downstream thickness measuring device 80 measures the thickness of the electrode sheet 1 after rolling by the roll press machine 30. The downstream thickness measuring device 80 also measures the thickness of the electrode sheet 1 at five points the same as the upstream thickness measuring device 70. That is, the downstream thickness measuring device 80 measures the thickness Tc of the center portion 1C of the electrode sheet 1 after rolling, the thickness Twe of the end portion 1WE on the work side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first intermediate portion 1WC, and the thickness Tdc of the second intermediate portion 1DC (see FIG. 6 for all, and the reference numerals indicating the thickness after rolling are different from those indicating the thickness before rolling). Here, the downstream thickness measuring device 80 includes five non-contact displacement sensors 81 provided above the center portion 1C, the end portion 1WE on the work side, the end portion 1DE on the driving side, the first intermediate portion 1WC, and the second intermediate portion 1DC of the electrode sheet 1, respectively. However, the configuration of the downstream thickness measuring device 80 is not particularly limited.

[0023] Fig. 4 is a control block diagram of the electrode rolling apparatus 10. As shown in Fig. 4, the control device 100 of the electrode rolling apparatus 10 is connected to the winding device 21, the upper roll rotating device 41, the lower roll rotating device 42, the first press cylinder 51L, the second press cylinder 51R, the first bending cylinder 61L, and the second bending cylinder 61R of the transporting device 20, and controls the operations of these devices. The control device 100 is also connected to the encoder 22, the upstream thickness measuring device 70, and the downstream thickness measuring device 80 of the transporting device 20, and receives signals therefrom.

[0024] The configuration 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 and the like from an external device, a central processing unit (CPU) for executing program instructions, a read only memory (ROM) that stores the program executed by the CPU, a random access memory (RAM) used as a working area for expanding the program, and a storage device such as a memory for storing the above program and various data.

[0025] As shown in FIG. 4, the control device 100 includes an upstream thickness acquisition unit 101, a downstream thickness acquisition unit 102, a conveying speed acquisition unit 103, a control formula memory unit 104, a control formula 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 bend pressure setting unit 110, and a second bend pressure setting unit 111.

[0026] The upstream thickness acquisition unit 101 acquires the thickness of the electrode sheet 1 measured by the upstream thickness measurement device 70. The upstream thickness acquisition unit 101 acquires, of the electrode sheet 1 before rolling, the thickness Tc0 of the central portion 1C in the width direction, the thickness Twe0 of the end portion 1WE on the work 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.

[0027] The downstream thickness acquisition unit 102 acquires the thickness of the electrode sheet 1 measured by the downstream thickness measurement device 80. The downstream thickness acquisition unit 102 acquires, of the electrode sheet 1 after rolling, the thickness Tc of the central portion 1C in the width direction, the thickness Twe of the end portion 1WE on the work 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.

[0028] The transport speed acquisition unit 103 acquires the transport speed of the electrode sheet 1 measured by the encoder 22 .

[0029] The control formula storage unit 104 stores first to eighth control formulas for calculating control values ​​for the first press cylinder 51L, the second press 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.

[0030] The first control formula is a control formula used when Twc>Tc and Twc>Twe, and is used to obtain a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Twc>Tc and Twc>Twe are satisfied, the thickness Twc of the first intermediate portion 1WC is thicker than the thickness Tc of the central portion 1C and the thickness Twe of the end portion 1WE on the workpiece side. In other words, the workpiece side of the electrode sheet 1 is undulating so that the first intermediate portion 1WC is convex (see [First Pattern] in FIG. 6).

[0031] The first control formula includes a formula for calculating the corrected deviation ΔTw=ΔTwc×Dwc / Dwe, where Dwe is the widthwise distance between the central portion 1C and the end portion 1WE on the work side, and Dwc is the widthwise distance between the central portion 1C and the first intermediate portion 1WC (see FIG. 6). ΔTwc is the deviation between the thickness Tc of the central portion 1C after rolling and the thickness Twc of the first intermediate portion 1WC, and here, the absolute value of (Twc-Tc). In this specification, the deviations ΔTw and ΔTwc are absolute values ​​of the difference, that is, positive values. Hereinafter, the same applies when expressed as "deviation", "difference", etc. Therefore, the magnitude of the deviation is compared by comparing the absolute values. However, the deviation may be defined as including a sign, and in that case, the description of this specification will be appropriately interpreted according to the definition. In the following, ΔTwe represents 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, the absolute value of (Twe-Tc).

[0032] The first control formula is applicable when the deviation ΔTwc is greater than the deviation ΔTwe, and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value Vw1 (see Fig. 5), or when the deviation ΔTwe is equal to or greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw1. In such cases, the control value of the first gap adjustment mechanism 50L that narrows the gap between the pair of rolling rolls 31, 32 on the work side and the control value of the first bending mechanism 60L that widens the gap between the pair of rolling rolls 31, 32 at the end 1WE on the work side are set.

[0033] Here, in the first control formula, when the deviation ΔTwe or the corrected deviation ΔTw exceeds the threshold value Vw1, the pressing pressure of the first press cylinder 51L is increased by a predetermined pressure compared to before. Also, in this case, the bending pressure of the first bending cylinder 61L is increased 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 press cylinder 51L and the first bending cylinder 61L when Twc > Tc and Twc > Twe are satisfied. The first gap setting unit 108 controls the pressing pressure of the first press cylinder 51L so as to obtain the set pressing pressure. The first bending pressure setting unit 110 controls the bending pressure of the first bending cylinder 61L so as to obtain the set bending pressure. The control device 100 repeats such feedback control until the state where the deviation ΔTwe or the corrected deviation ΔTw exceeds the threshold value Vw1 is eliminated.

[0034] The second control formula is a control formula used when Twc < Tc and Twc < Twe, and is for obtaining the control values for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Twc < Tc and Twc < Twe are satisfied, 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 1WE on the work side. That is, the work side of the electrode sheet 1 is curved such that the first intermediate portion 1WC is concave (see [Second Pattern] in Fig. 6).

[0035] The second control formula is configured to set a control value of the first gap adjustment mechanism 50L that widens the gap between the pair of rolling rolls 31, 32 on the work side and a control value of the first bending mechanism 60L that narrows the gap between the pair of rolling rolls 31, 32 at the end 1WE on the work side when the deviation ΔTwc is larger than the deviation ΔTwe and the corrected deviation ΔTw=ΔTwc×Dwc / Dwe exceeds a predetermined threshold value Vw2 (see FIG. 5), or when the deviation ΔTwe is equal to or larger than the deviation ΔTwc and exceeds the threshold value Vw2. The feedback control using the second control formula is similar to the case of using the first control formula. The same is true for the other control formulas. The threshold value Vw2 may be the same as or different from the threshold value Vw1.

[0036] The third control formula is a control formula used when Tc≦Twc≦Twe, and is used to find a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Tc≦Twc≦Twe is satisfied, the thickness of the electrode sheet 1 on the workpiece side is thinnest at the central portion 1C, and becomes thicker at the first intermediate portion 1WC, the end portion 1WE on the workpiece side, and the farther away from the central portion 1C (see [Third Pattern] in FIG. 6).

[0037] The third control formula is configured to set a control value of the first bending mechanism 60L so as to narrow the gap between the pair of rolling rolls 31, 32 at the work-side end 1WE when the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the work-side end 1WE exceeds a predetermined threshold Vw3 (see Figure 5).

[0038] The fourth control formula is a control formula used when Tc ≧ Twc ≧ Twe, and is used to find a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. When Tc ≧ Twc ≧ Twe is established, the thickness of the electrode sheet 1 on the workpiece side is the thickest at the central portion 1C, and becomes thinner at the first intermediate portion 1WC, the end portion 1WE on the workpiece side, and the farther away from the central portion 1C (see [fourth pattern] in FIG. 6).

[0039] The fourth control formula is configured to set a control value of the first bending mechanism 60L such that the gap between the pair of rolling rolls 31, 32 at the work-side end 1WE is widened when the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the work-side end 1WE exceeds a predetermined threshold value Vw4 (see FIG. 5).

[0040] As described above, the first to fourth control formulas are control formulas for correcting the variation in thickness of the electrode sheet 1 on the work side. The first to fourth control formulas are applied to the first case where the electrode sheet 1 is undulating so that the first intermediate portion 1WC is convex, the second case where the first intermediate portion 1WC is undulating so that the first intermediate portion 1WC is concave, the third case where the thickness is thicker toward the work side end portion 1WE, and the fourth case where the thickness is thinner toward the work side end portion 1WE. The control device 100 compares the measured values ​​of the thickness Tc of the central portion 1C, the thickness Twe of the work side end portion 1WE, and the thickness Twc of the first intermediate portion 1WC, and determines which of the first to fourth control formulas should be used based on the comparison result. The control device 100 calculates the deviation ΔTwe between the thickness Tc of the central portion 1C and the thickness Twe of the work side end portion 1WE, and the deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC. As described above, regardless of which of the first control formula to the fourth control formula is used, the control device 100 controls the first gap adjustment mechanism 50L and the first bending mechanism 60L so as to reduce the larger of the deviations ΔTwe and ΔTwc.

[0041] The fifth to eighth control formulas are control formulas for correcting variations in thickness on the drive side of electrode sheet 1, and correspond to the first to fourth control formulas, which are control formulas on the work side, respectively.

[0042] The fifth control formula is a control formula used when Tdc>Tc and Tdc>Tde, and is used to obtain a control value for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tdc>Tc and Tdc>Tde are satisfied, 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. In other words, the driving side of the electrode sheet 1 is undulating so that the second intermediate portion 1DC is convex (see [first pattern] in FIG. 6). Although not shown, the thickness variation state (whether the intermediate portion is undulating so as to be convex or concave, or whether the thickness becomes thicker or thinner toward the end portion) may be different between the work side and the driving side of the electrode sheet 1.

[0043] The fifth control formula includes a formula for calculating the corrected deviation ΔTd=ΔTdc×Ddc / Dde, where Dde is the widthwise distance between the central portion 1C and the end portion 1DE on the driving side, and Ddc is the widthwise distance between the central portion 1C and the second intermediate portion 1DC (see FIG. 6). 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, here the absolute value of (Tdc-Tc). In the following, 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, here the absolute value of (Tde-Tc).

[0044] The fifth control formula is configured to set a control value of the second gap adjustment mechanism 50R to narrow the gap between the pair of rolling rolls 31, 32 on the drive side and a control value of the second bending mechanism 60R to widen the gap between the pair of rolling rolls 31, 32 at the drive side end 1DE when the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and exceeds the threshold value. The threshold value on the drive side may be the same as or different from the threshold value Vw1 on the work side.

[0045] The fifth control formula is applicable 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 equal to or greater than the deviation ΔTdc and the deviation ΔTde exceeds the threshold value. In this case, the press pressure of the second press cylinder 51R is increased by a predetermined pressure compared to before. Also, in this case, the fifth control formula increases the bend pressure of the second bend cylinder 61R by a predetermined pressure compared to before. When Tdc > Tc and Tdc > Tde are satisfied, the control formula selection unit 105 selects the fifth control formula as the control formula for setting the control values of the second press cylinder 51R and the second bend cylinder 61R. The second gap setting unit 109 controls the press pressure of the second press cylinder 51R so that the set press pressure is obtained. The second bend pressure setting unit 111 controls the bend pressure of the second bend cylinder 61R so that the set bend pressure is obtained. The control device 100 repeats such feedback control until the state where the deviation ΔTde or the corrected deviation ΔTd exceeds the threshold value is eliminated.

[0046] The sixth control formula is a control formula used when Tdc < Tc and Tdc < Tde, and is for obtaining control values for controlling the second gap adjustment mechanism 50R and the second bend mechanism 60R. When Tdc < Tc and Tdc < Tde are satisfied, 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 work side. That is, the drive side of the electrode sheet 1 is curved so that the second intermediate portion 1DC is concave (see [Second Pattern] in FIG. 6).

[0047] The sixth control formula is configured to set a control value of the second gap adjustment mechanism 50R that widens the gap between the pair of rolling rolls 31, 32 on the driving side and a control value of the second bending mechanism 60R that narrows the gap between the pair of rolling rolls 31, 32 at the end 1DE on the driving side when the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and 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.

[0048] The seventh control equation is a control equation used when Tc≦Tdc≦Tde, and is used to find a control value for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tc≦Tdc≦Tde is satisfied, the thickness of the driving side of the electrode sheet 1 is thinnest at the central portion 1C, and becomes thicker at the second intermediate portion 1DC, the driving side end portion 1DE, and the farther away from the central portion 1C (see [Third Pattern] in FIG. 6).

[0049] The seventh control formula is configured to set a control value of the second bending mechanism 60R so as to narrow the gap between the pair of rolling rolls 31, 32 at the drive side end 1DE when the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the drive side end 1DE exceeds a predetermined threshold value.

[0050] The eighth control equation is a control equation used when Tc ≧ Tdc ≧ Tde, and is used to find a control value for controlling the second gap adjustment mechanism 50R and the second bending mechanism 60R. When Tc ≧ Tdc ≧ Tde is established, the thickness of the driving side of the electrode sheet 1 is the thickest at the center portion 1C, and becomes thinner at the second intermediate portion 1DC, the driving side end portion 1DE, and the farther away from the center portion 1C (see [fourth pattern] in FIG. 6).

[0051] The eighth control formula is configured to set a control value of the second bending mechanism 60R such that the gap between the pair of rolling rolls 31, 32 at the drive side end 1DE is widened when the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the drive side end 1DE exceeds a predetermined threshold value.

[0052] As described above, the fifth to eighth control formulas are control formulas for correcting the variation in thickness of the electrode sheet 1 on the driving side. The fifth to eighth control formulas are applied to the first case in which the electrode sheet 1 is undulating so that the second intermediate portion 1DC is convex, the second case in which the second intermediate portion 1DC is undulating so that the second intermediate portion 1DC is concave, the third case in which the thickness is thicker toward the driving side end 1DE, and the fourth case in which the thickness is thinner toward the driving side end 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 1DE, and the thickness Tdc of the second intermediate portion 1DC, and determines which of the fifth to eighth control formulas should be used based on the comparison result. The control device 100 calculates the deviation ΔTde between the thickness Tc of the central portion 1C and the thickness Tde of the driving side end 1DE, and the deviation ΔTdc between the thickness Tc of the central portion 1C and the thickness Tdc of the second intermediate portion 1DC. Regardless of which of the fifth to eighth control formulas is used, the control device 100 controls the second gap adjustment mechanism 50R and the second bending mechanism 60R so as to reduce the larger of the deviations ΔTde and ΔTdc.

[0053] The execution determination unit 107 is configured to perform control to correct the thickness variation of the electrode sheet 1 when the conveying speed of the electrode sheet 1 by the conveying device 20 is equal to or higher than a predetermined threshold speed Vv (see FIG. 5), and to maintain the rolling conditions without performing control to correct the thickness variation of the electrode sheet 1 when the conveying speed is lower than the threshold speed Vv. That is, when the conveying speed of the electrode sheet 1 by the conveying device 20 is equal to or higher 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 to reduce the larger of the deviations ΔTwe and ΔTwc and the larger of the deviations ΔTde and ΔTdc. When the transport speed of the electrode sheet 1 by the transport device 20 is lower 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.

[0054] In this embodiment, 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 thickness Tc0 of the central portion 1C before rolling, the thickness Twe0 of the end portion 1WE on the work 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. Here, the control device 100 selects one of the first control formula to the fourth control formula and one of the fifth control formula to the eighth control formula 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 rolling of a new electrode sheet 1. This can shorten the time until the feedback control related to the rolling of the new electrode sheet 1 becomes stable (the time until the variation in the thickness of the new electrode sheet 1 falls within the allowable range). As a result, the amount of electrode sheet 1 that is wasted during feedback control can be reduced.

[0055] However, the control formula for setting the initial control value does not have to be the first to eighth control formulas. The control formula for setting the initial control value may be, for example, a control formula similar to the first to eighth control formulas, but with a change amount or threshold value of the control value different from the first to eighth control formulas.

[0056] [Electrode sheet rolling process] The rolling process of the electrode sheet 1 will be described below. Fig. 5 is a flowchart showing the flow of feedback control of the thickness of the electrode sheet 1. Fig. 5 shows one feedback control, and such control is repeated in the rolling process of the electrode sheet 1. Note that the setting of the initial control value based on the thickness measurement of the electrode sheet 1 before rolling is similar to the feedback control after rolling, so a description thereof will be omitted.

[0057] As shown in FIG. 5, 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 acquired. In step S02, the conveying speed V of the electrode sheet 1 is compared with a predetermined threshold speed Vv. If the conveying speed V of the electrode sheet 1 is equal to or greater than the threshold speed Vv (if the result of step S02 is YES), the thickness control of the electrode sheet 1 is performed in step S03 and thereafter. If the conveying speed V of the electrode sheet 1 is smaller than the threshold speed Vv (if 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 (END in FIG. 5). This is because, when the conveying speed V of the electrode sheet 1 is slow, the electrode sheet 1 is sufficiently rolled and there is little variation in the thickness of the electrode sheet 1.

[0058] 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 work side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first intermediate portion 1WC, and the thickness Tdc of the second intermediate portion 1DC are acquired. In steps S04 to S06, for the work side, it is determined which of the four patterns the thickness variation of the electrode sheet 1 belongs to. That is, the thickness variation of the electrode sheet 1 is the first pattern where Twc > Tc and Twc > Twe (the pattern where the first intermediate portion 1WC is convex), the second pattern where Twc < Tc and Twc < Twe (the pattern where the first intermediate portion 1WC is concave), the third pattern where Tc ≤ Twc ≤ Twe (the pattern where it gets thicker towards the end), or the fourth pattern where Tc ≥ Twc ≥ Twe (the pattern where it gets thinner towards the end) is determined (see Fig. 6, Fig. 6 is a schematic diagram showing the thickness distribution pattern according to the position in the width direction of the electrode sheet 1).

[0059] The order of steps S04 to S06 is not particularly limited. However, in the example of Fig. 5, 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.

[0060] In step S08A following step S07A, 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 are calculated. Furthermore, in step S08A, the deviation ΔTwe (absolute value) is compared with the deviation ΔTwc (absolute value).

[0061] If 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), the corrected deviation ΔTw=ΔTwc×Dwc / Dwe is calculated in step S09A1. Furthermore, in step S09A1, it is determined whether the corrected deviation ΔTw exceeds a threshold value Vw1.

[0062] If the corrected deviation ΔTw exceeds the threshold value Vw1 (if the result of step S09A1 is YES), in step S10A, the press pressure of the first press cylinder 51L is increased by a predetermined pressure, and the bend pressure of the first bend cylinder 61L is increased by a predetermined pressure. If the corrected deviation ΔTw does not exceed the threshold value Vw1 (if the result of step S09A1 is NO), the press pressure of the first press cylinder 51L and the bend pressure of the first bend cylinder 61L are maintained (END in FIG. 5).

[0063] Returning to step S08A, if the deviation ΔTwe of the workpiece side end 1WE is greater than the deviation ΔTwc of the first intermediate portion 1WC (if the result of step S08A is NO), then in step S09A2, it is determined whether the deviation ΔTwe exceeds the threshold value Vw1.

[0064] If the deviation ΔTwe exceeds the threshold value Vw1 (if the result of step S09A2 is YES), in step S10A, the press pressure of the first press cylinder 51L is increased by a predetermined pressure, and the bend pressure of the first bend cylinder 61L is increased by a predetermined pressure. If the deviation ΔTwe does not exceed the threshold value Vw1 (if the result of step S09A2 is NO), the press pressure of the first press cylinder 51L and the bend pressure of the first bend cylinder 61L are maintained (END in FIG. 5).

[0065] When the second control formula is used, in step S08B following step S07B, 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 are calculated. Furthermore, in step S08B, the deviation ΔTwe (absolute value) is compared with the deviation ΔTwc (absolute value). Step S08B is similar to step S08A.

[0066] If 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 S08B is YES), the corrected deviation ΔTw=ΔTwc×Dwc / Dwe is calculated in step S09B1. Furthermore, in step S09B1, it is determined whether the corrected deviation ΔTw exceeds a threshold value Vw2. Step S09B1 is similar to step S09A1.

[0067] If the corrected deviation ΔTw exceeds the threshold value Vw2 (if the result of step S09B1 is YES), in step S10B, the press pressure of the first press cylinder 51L is reduced by a predetermined pressure, and the bend pressure of the first bend cylinder 61L is reduced by a predetermined pressure. In step S10B, the press pressure and bend pressure are changed in the opposite direction to that in step S10A. If the corrected deviation ΔTw does not exceed the threshold value Vw2 (if the result of step S09B1 is NO), the press pressure of the first press cylinder 51L and the bend pressure of the first bend cylinder 61L are maintained (END in FIG. 5).

[0068] Returning to step S08B, if the deviation ΔTwe of the workpiece side end 1WE is greater than the deviation ΔTwc of the first intermediate portion 1WC (if the result of step S08B is NO), then in step S09B2, it is determined whether the deviation ΔTwe exceeds the threshold value Vw2.

[0069] If the deviation ΔTwe exceeds the threshold Vw2 (if the result of step S09B2 is YES), in step S10B, the press pressure of the first press cylinder 51L is reduced by a predetermined pressure, and the bend pressure of the first bend cylinder 61L is reduced by a predetermined pressure. If the deviation ΔTwe does not exceed the threshold Vw2 (if the result of step S09B2 is NO), the press pressure of the first press cylinder 51L and the bend pressure of the first bend cylinder 61L are maintained (END in FIG. 5).

[0070] When the third control formula is used, in step S08C following step S07C, 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. In step S09C, it is determined whether the deviation ΔTwe exceeds the threshold value Vw3. If the deviation ΔTwe exceeds the threshold value Vw3 (if 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. If the deviation ΔTwe does not exceed the threshold value Vw3 (if the result of step S09C is NO), the pressing pressure of the first pressing cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (END in FIG. 5).

[0071] 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. If the deviation ΔTwe exceeds the threshold value Vw4 (if the result of step S09D is YES), in step S10D, the bending pressure of the first bending cylinder 61L is increased by a predetermined pressure. If the deviation ΔTwe does not exceed the threshold value Vw4 (if the result of step S09D is NO), the pressing pressure of the first pressing cylinder 51L and the bending pressure of the first bending cylinder 61L are maintained (END in FIG. 5).

[0072] The thickness control on the drive side is performed in the same manner as on the work side, so illustration and explanation of the flow chart will be omitted.

[0073] [Effects of the embodiment] The following describes the effects that can be achieved by the electrode rolling device 10 according to this embodiment.

[0074] The electrode rolling device 10 according to this embodiment includes a conveying device 20 that conveys the strip-shaped electrode sheet 1 on which the electrode active material layer 3 is formed along a predetermined conveying path, a roll press machine 30 that is disposed on the conveying path and rolls the electrode sheet 1, and a control device 100. The roll press machine 30 includes a pair of rolling rolls 31, 32 that sandwich the electrode sheet 1, a first gap adjustment mechanism 50L that adjusts the gap between the pair of rolling rolls 31, 32 on the work side in the width direction of the pair of rolling rolls 31, 32, a second gap adjustment mechanism 50R that adjusts the gap between the pair of rolling rolls 31, 32 on the drive side in the width direction of the pair of rolling rolls 31, 32, a first bending mechanism 60L that corrects the deflection of the pair of rolling rolls 31, 32 on the work side of the pair of rolling rolls 31, 32, and a second bending mechanism 60R that corrects the deflection of the pair of rolling rolls 31, 32 on the drive side of the pair of rolling rolls 31, 32. The control device 100 acquires the thickness Tc of the central portion 1C in the width direction, the thickness Twe of the end portion 1WE on the work side, the thickness Tde of the end portion 1DE on the driving side, the thickness Twc of the first intermediate portion 1WC set between the central portion 1C and the end portion 1WE on the work side, and the thickness Tdc of the second intermediate portion 1DC set between the central portion 1C and the end portion 1DE on the driving side of 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 work side, and the deviation ΔTwc between the thickness Tc of the central portion 1C and the thickness Twc of the first intermediate portion 1WC, as well as 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, 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 of the deviations ΔTwe and ΔTwc, and the larger of the deviations ΔTde and ΔTdc.

[0075] 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 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 work 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 to reduce the larger of 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, 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 if the thickness of the first intermediate portion 1WC or the second intermediate portion 1DC is thick or thin due to waviness, the variation in the thickness of the electrode sheet 1 depending on the position in the width direction can be reduced.

[0076] FIG. 7 is a graph showing the maximum deviation in thickness of the electrode sheet 1. The vertical axis of FIG. 7 shows the maximum deviation in thickness of the electrode sheet 1. The horizontal axis of FIG. 7 shows the position where the deviation in thickness of the electrode sheet 1 is maximum. In FIG. 7, the conventional control represented by a circle is a plot of the results when the control is performed based on the control formulas similar to the control formulas 3, 4, 7, and 8. In FIG. 7, the control represented by a square is a plot of the results when the control is performed by the control method according to the present embodiment. As shown in FIG. 7, according to the control method according to the present embodiment, the maximum deviation in thickness of the electrode sheet 1 is reduced compared to the conventional control. That is, the variation in thickness is suppressed.

[0077] In this embodiment, the control device 100 stores the first to fourth control formulas. The first control formula is used when Twc > Tc and Twc > Twe, and obtains a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. The second control formula is used when Twc < Tc and Twc < Twe, and obtains a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. The third control formula is used when Tc ≤ Twc ≤ Twe, and obtains a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L. The fourth control formula is used when Tc ≥ Twc ≥ Twe, and obtains a control value for controlling the first gap adjustment mechanism 50L and the first bending mechanism 60L.

[0078] According to such a configuration, four control formulas are selectively used according to four patterns of thickness variations on the work side. Thereby, even if the pattern of thickness variations on the work side is any of the four patterns, it is possible to reduce the thickness variations of the electrode sheet 1 due to the position in the width direction. The same applies to the drive side.

[0079] In this embodiment, the first bending mechanism 60L is configured to change the gap between the pair of rolling rolls 31 and 32 at the end 1WE on the work side. In the first control formula, the distance in the width direction between the central portion 1C and the end 1WE on the work side is Dwe, and the distance in the width direction between the central portion 1C and the first intermediate portion 1WC is Dwc. When the deviation ΔTwc is larger than the deviation ΔTwe, and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value Vw1, or when the deviation ΔTwe is equal to or greater than the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value Vw1, the control value of the first gap adjustment mechanism 50L for narrowing the gap between the pair of rolling rolls 31 and 32 on the work side and the control value of the first bending mechanism 60L for widening the gap between the pair of rolling rolls 31 and 32 at the end 1WE on the work side are set.

[0080] According to this configuration, the larger of the deviations ΔTwe and ΔTwc is compared with the threshold value Vw1. As a result, control is performed to correct the larger of the deviations ΔTwe and ΔTwc, and the variation in thickness of the electrode sheet 1 depending on the position in the width direction can be reduced. When the deviation ΔTwc of the first intermediate 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 intermediate portion 1WC is compared with the threshold value Vw1. The corrected deviation ΔTw represents the amount of bending of the first intermediate portion 1WC when the end portion 1WE is bent, and the amount of change in the bending pressure of the first bending mechanism 60L can be appropriately obtained by using the corrected deviation ΔTw. The same applies to the driving side.

[0081] In this embodiment, the second control formula is configured to set a control value of the first gap adjustment mechanism 50L such that the gap between the pair of rolling rolls 31, 32 on the work side is widened and a control value of the first bend mechanism 60L such that the gap between the pair of rolling rolls 31, 32 at the work side end 1WE is narrowed when the deviation ΔTwc is greater than the deviation ΔTwe and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value Vw2, or when the deviation ΔTwe is greater than or equal to the deviation ΔTwc and exceeds the threshold value Vw2.

[0082] According to this configuration, the direction of thickness correction is opposite to that of the first control type, but the same effects as those of the first control type can be achieved. The same is true for the driving side.

[0083] In this embodiment, when the conveying speed V of the electrode sheet 1 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 to reduce the larger of the deviations ΔTwe and ΔTwc and the larger of the deviations ΔTde and ΔTdc. Furthermore, when the conveying speed V of the electrode sheet 1 by the conveying device 20 is lower 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.

[0084] According to the findings of the present inventors, when the conveying speed V of the electrode sheet 1 is slow, the electrode sheet 1 is sufficiently rolled and there is little variation in the thickness of the electrode sheet 1. According to the above configuration, when the conveying speed V of the electrode sheet 1 is slower than the threshold speed Vv, it is possible to omit the control of thickness variation.

[0085] The electrode rolling apparatus 10 of this embodiment is equipped with a downstream thickness measuring device 80, downstream of the roll press machine 30 on the conveying path, which measures the thickness Tc of the central portion 1C of the electrode sheet 1 after rolling, the thickness Twe of the work side end portion 1WE, the thickness Tde of the drive side end portion 1DE, the thickness Twc of the first intermediate portion 1WC, and the thickness Tdc of the second intermediate portion 1DC.

[0086] With this configuration, the control device 100 can acquire 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 work 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.

[0087] The electrode rolling apparatus 10 according to this embodiment includes an upstream thickness measuring device 70 that measures the thickness Tc0 of the central portion 1C, the thickness Twe0 of the end 1WE on the work side, the thickness Tde0 of the end 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, upstream of the roll press machine 30. 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.

[0088] According to this configuration, the feedback control related to the rolling of the new electrode sheet 1 is stabilized, and the time until the variation in the thickness of the electrode sheet 1 falls within the allowable range can be shortened. As a result, the amount of the electrode sheet 1 wasted during the feedback control can be reduced.

[0089] [Other embodiments] An embodiment of the electrode sheet rolling device proposed herein has been described above. However, the above embodiment is merely an example, and the present invention can be implemented in other ways. For example, in the above embodiment, the thickness of the electrode sheet is measured at five points in the width direction, and the thickness variation control is performed based on the thicknesses of the five measured points. However, the number of points at which the thickness is measured and the thickness variation control is performed based on the measured values ​​may be six or more.

[0090] In the above embodiment, feedforward control was performed based on the thickness measurement of the electrode sheet before rolling, but feedforward control may not be performed. In the above embodiment, when the conveying speed of the electrode sheet is slow, feedback control was not performed, but it may be performed. In that case, the control formula may be changed according to the conveying speed of the electrode sheet. For example, the control formula in that case may be a control formula that continuously or stepwise reduces the change amount of the press pressure of the gap adjustment mechanism and the bend pressure of the bend mechanism as the conveying speed of the electrode sheet becomes slower.

[0091] In addition, the above-described embodiments do not limit the present invention unless otherwise specified. Furthermore, the technology disclosed herein can be modified in various ways, and the components and processes described herein can be omitted or combined as appropriate, provided that no particular problems arise.

[0092] This specification includes the disclosures set forth in the following sections:

[0093] Section 1: a conveying device that conveys a belt-shaped electrode sheet on which an electrode active material layer is formed along a predetermined conveying path; a rolling device disposed on the transport path and configured to roll the electrode sheet; A control device, The rolling device is A pair of rolling rolls sandwiching the electrode sheet; a first gap adjustment mechanism that adjusts a gap between the pair of rolling rolls on a first side in the width direction of the pair of rolling rolls; a second gap adjustment mechanism that adjusts a gap between the pair of rolling rolls on a second side in the width direction of the pair of rolling rolls; a first bending mechanism for correcting deflection of the pair of rolling rolls on the first side in the width direction of the pair of rolling rolls; A second bending mechanism for correcting deflection of the pair of rolling rolls on the second side in the width direction of the pair of rolling rolls, The control device includes: Among the electrode sheets, The thickness Tc of the center part in the width direction, A thickness Twe of the first side end portion; A thickness Tde of the second side end portion; a thickness Twc of a first intermediate portion set between the central portion and the end portion on the first side; A thickness Tdc of a second intermediate portion set between the central portion and the end portion on the second side is obtained; 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 are obtained, Obtain 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 intermediate portion. Control the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism 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. Electrode rolling device.

[0094] Item 2: The control device A first control formula used when Twc>Tc and Twc>Twe to obtain a control value for controlling the first gap adjustment mechanism and the first bending mechanism, A second control formula used when Twc<Tc and Twc<Twe to obtain a control value for controlling the first gap adjustment mechanism and the first bending mechanism, A third control formula used when Tc≦Twc≦Twe to obtain a control value for controlling the first gap adjustment mechanism and the first bending mechanism, A fourth control formula used when Tc≧Twc≧Twe to obtain a control value for controlling the first gap adjustment mechanism and the first bending mechanism, and stores them. The electrode rolling device according to Item 1.

[0095] Item 3: The first bending mechanism is configured to change the gap between the pair of rolling rolls at the end portion on the first side. The first control formula Let the distance in the width direction between the central portion and the end portion on the first side be Dwe. Let the distance in the width direction between the central portion and the first intermediate portion be Dwc. When the deviation ΔTwc is greater than the deviation ΔTwe, and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value, or when the deviation ΔTwe is greater than or equal to the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value, the control value of the first gap adjustment mechanism for narrowing the gap between the pair of rolling rolls on the first side and the control value of the first bending mechanism for widening the gap between the pair of rolling rolls at the end on the first side are configured to be set. The electrode rolling apparatus according to item 2.

[0096] Item 4: The first bending mechanism is configured to change the gap between the pair of rolling rolls at the end on the first side. The second control formula is Let the distance in the width direction between the central part and the end on the first side be Dwe. Let the distance in the width direction between the central part and the first intermediate part be Dwc. When the deviation ΔTwc is greater than the deviation ΔTwe, and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value, or when the deviation ΔTwe is greater than or equal to the deviation ΔTwc and the deviation ΔTwe exceeds the threshold value, the control value of the first gap adjustment mechanism for widening the gap between the pair of rolling rolls on the first side and the control value of the first bending mechanism for narrowing the gap between the pair of rolling rolls at the end on the first side are configured to be set. The electrode rolling apparatus according to item 2 or 3.

[0097] Item 5: The control device is A fifth control formula used when Tdc > Tc and Tdc > Tde, for obtaining the control values for controlling the second gap adjustment mechanism and the second bending mechanism. A sixth control formula used when Tdc < Tc and Tdc < Tde, for obtaining the control values for controlling the second gap adjustment mechanism and the second bending mechanism. a seventh control formula that is used when Tc≦Tdc≦Tde and determines a control value for controlling the second gap adjustment mechanism and the second bending mechanism; an eighth control formula that is used when Tc≧Tdc≧Tde and that determines a control value for controlling the second gap adjustment mechanism and the second bending mechanism; Item 5. An electrode rolling apparatus according to any one of Items 1 to 4.

[0098] Item 6: The second bending mechanism is configured to change a gap between the pair of rolling rolls at the second end, The fifth control formula is: The distance in the width direction between the central portion and the second end portion is Dde, The distance in the width direction between the central portion and the second intermediate portion is Ddc, When the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and exceeds the threshold value, a control value of the second gap adjustment mechanism is set so as to narrow the gap between the pair of rolling rolls on the second side, and a control value of the second bend mechanism is set so as to widen the gap between the pair of rolling rolls at the end of the second side. Item 6. The electrode rolling apparatus according to item 5.

[0099] Section 7: The second bending mechanism is configured to change a gap between the pair of rolling rolls at the second end, The sixth control formula is: The distance in the width direction between the central portion and the second end portion is Dde, The distance in the width direction between the central portion and the second intermediate portion is Ddc, When the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd=ΔTdc×Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and exceeds the threshold value, a control value of the second gap adjustment mechanism is set so as to widen the gap between the pair of rolling rolls on the second side, and a control value of the second bend mechanism is set so as to narrow the gap between the pair of rolling rolls at the end of the second side. Item 5. The electrode rolling apparatus according to item 5 or 6.

[0100] Section 8: The control device includes: when a transport speed of the electrode sheet by the transport device is equal to or higher than a predetermined threshold speed, the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism are controlled so as to reduce a larger one of the deviations ΔTwe and ΔTwc and a larger one of the deviations ΔTde and ΔTdc; when the transport speed of the electrode sheet by the transport device is lower than the threshold speed, control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism are maintained. 8. An electrode rolling apparatus according to any one of items 1 to 7.

[0101] Section 9: The conveying path is further provided with a first thickness measuring device downstream of the rolling device, the first thickness measuring device measuring a thickness Tc of the central portion, a thickness Twe of the end portion on the first side, a thickness Tde of the end portion on the second side, a thickness Twc of the first intermediate portion, and a thickness Tdc of the second intermediate portion of the electrode sheet after rolling. Item 9. An electrode rolling apparatus according to any one of Items 1 to 8.

[0102] Section 10: A second thickness measuring device is further provided, upstream of the rolling device in the transport path, for measuring a thickness Tc0 of the central portion, a thickness Twe0 of the end portion on the first side, a thickness Tde0 of the end portion on the second side, a thickness Twc0 of the first intermediate portion, and a thickness Tdc0 of the second intermediate portion of the electrode sheet before rolling, 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 thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0. 10. An electrode rolling apparatus according to any one of items 1 to 9. [Explanation of symbols]

[0103] 1 Electrode sheet 1C central part 1WE Work side end (first side end) 1DE Driving end (second end) 1WC 1st intermediate section 1DC 2nd intermediate section 2 Current collecting foil 3 Electrode active material layer 4 Unformed area 10 Electrode rolling equipment 20. Conveyor 21 Winding device 22 Encoder 30 Roll press machine (rolling equipment) 31 Upper Roll 32 Lower roll 33L Left side bearing of upper roll 33R Right side bearing of upper roll 34L Left side bearing of lower roll 34R Right side bearing of lower roll 35L Upper roll left bend bearing 35R Right bend bearing for upper roll 36L Lower roll left bend bearing 36R Right bend bearing of lower roll 41 Upper roll rotation device 42 Lower roll rotation device 50L First gap adjustment mechanism 50R Second gap adjustment mechanism 51L First press cylinder 51R Second press cylinder 60L 1st bending mechanism 60R 2nd bending mechanism 61L 1st bend cylinder 61R 2nd bend 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 thickness acquisition unit 102 Downstream thickness acquisition unit 103 Conveying speed acquisition unit 104 Controlled Memory Unit 105 Controlled Selection Unit 106 Control value setting unit 107 Execution decision unit 108 First gap setting section 109 Second gap setting section 110 First bend pressure setting section 111 Second bend pressure setting section Tc Center thickness Twe Thickness of the workpiece end (thickness of the first end) Tde Thickness of the driving end (thickness of the second end) Twc Thickness of the first middle part Tdc Thickness of the second middle part Tc0 Thickness at center (before rolling) Twe0 Thickness of the workpiece end (thickness of the first end, before rolling) Tde0 Thickness of the driving end (thickness of the second end, before rolling) Twc0 Thickness of the first intermediate part (before rolling) Tdc0 Thickness of the second intermediate part (before rolling) ΔTwe Deviation between Tc and Twe ΔTwc Deviation between Tc and Twc ΔTde Deviation between Tc and Tde ΔTdc Deviation between Tc and Tdc Vw1 threshold Vw2 Threshold Vw3 Threshold Vw4 Threshold Vv threshold speed

Claims

1. a conveying device that conveys a belt-shaped electrode sheet on which an electrode active material layer is formed along a predetermined conveying path; a rolling device disposed on the transport path and configured to roll the electrode sheet; A control device, The rolling device is A pair of rolling rolls sandwiching the electrode sheet; a first gap adjustment mechanism that adjusts a gap between the pair of rolling rolls on a first side in a width direction of the pair of rolling rolls; a second gap adjustment mechanism that adjusts a gap between the pair of rolling rolls on a second side in the width direction of the pair of rolling rolls; a first bending mechanism for correcting deflection of the pair of rolling rolls on the first side in the width direction of the pair of rolling rolls; a second bending mechanism for correcting deflection of the pair of rolls on the second side in the width direction of the pair of rolls, The control device includes: Among the electrode sheets, The thickness Tc of the central portion in the width direction; A thickness Twe of the first side end portion; A thickness Tde of the second end portion; a thickness Twc of a first intermediate portion set between the central portion and the end portion on the first side; A thickness Tdc of a second intermediate portion set between the central portion and the end portion on the second side is obtained; 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 are obtained, A deviation ΔTde between the thickness Tc of the central portion and the thickness Tde of the second side 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; controlling the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism so as to reduce the larger of the deviations ΔTwe and ΔTwc, and the larger of the deviations ΔTde and ΔTdc; Electrode rolling equipment.

2. The control device includes: a first control equation that is used when Twc>Tc and Twc>Twe and determines 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 determines 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 determines a control value for controlling the first gap adjustment mechanism and the first bending mechanism; a fourth control formula which is used when Tc≧Twc≧Twe and determines a control value for controlling the first gap adjustment mechanism and the first bending mechanism; 2. The electrode rolling apparatus according to claim 1.

3. The first bending mechanism is configured to change a gap between the pair of rolling rolls at the first end, The first control equation is The distance in the width direction between the central portion and the end portion on the first side is Dwe, The distance in the width direction between the center portion and the first intermediate portion is Dwc, when the deviation ΔTwc is larger than the deviation ΔTwe and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value, or when the deviation ΔTwe is equal to or larger than the deviation ΔTwc and exceeds the threshold value, a control value of the first gap adjustment mechanism that narrows the gap between the pair of rolling rolls on the first side and a control value of the first bend mechanism that widens the gap between the pair of rolling rolls at the end of the first side are set.

3. The electrode rolling apparatus according to claim 2.

4. The first bending mechanism is configured to change a gap between the pair of rolling rolls at the first end, The second control formula is The distance in the width direction between the central portion and the end portion on the first side is Dwe, The distance in the width direction between the center portion and the first intermediate portion is Dwc, when the deviation ΔTwc is larger than the deviation ΔTwe and the corrected deviation ΔTw = ΔTwc × Dwc / Dwe exceeds a predetermined threshold value, or when the deviation ΔTwe is equal to or larger than the deviation ΔTwc and exceeds the threshold value, a control value of the first gap adjustment mechanism is set so as to widen the gap between the pair of rolling rolls on the first side, and a control value of the first bend mechanism is set so as to narrow the gap between the pair of rolling rolls at the end of the first side.

3. The electrode rolling apparatus according to claim 2.

5. The control device includes: a fifth control equation which is used when Tdc>Tc and Tdc>Tde and determines a control value 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 determines a control value for controlling the second gap adjustment mechanism and the second bending mechanism; a seventh control equation that is used when Tc≦Tdc≦Tde and that determines a control value for controlling the second gap adjustment mechanism and the second bending mechanism; an eighth control formula that is used when Tc ≧ Tdc ≧ Tde and that determines a control value for controlling the second gap adjustment mechanism and the second bending mechanism; 2. The electrode rolling apparatus according to claim 1.

6. The second bending mechanism is configured to change a gap between the pair of rolling rolls at the second end, The fifth control formula is: The distance in the width direction between the central portion and the second end portion is Dde, The distance in the width direction between the central portion and the second intermediate portion is Ddc, when the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd = ΔTdc × Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and exceeds the threshold value, a control value of the second gap adjustment mechanism that narrows the gap between the pair of rolling rolls on the second side and a control value of the second bend mechanism that widens the gap between the pair of rolling rolls at the end of the second side are set.

6. An electrode rolling apparatus according to claim 5.

7. The second bending mechanism is configured to change a gap between the pair of rolling rolls at the second end, The sixth control formula is: The distance in the width direction between the central portion and the second end portion is Dde, The distance in the width direction between the central portion and the second intermediate portion is Ddc, when the deviation ΔTdc is larger than the deviation ΔTde and the corrected deviation ΔTd = ΔTdc × Ddc / Dde exceeds a predetermined threshold value, or when the deviation ΔTde is equal to or larger than the deviation ΔTdc and exceeds the threshold value, a control value of the second gap adjustment mechanism is set so as to widen the gap between the pair of rolling rolls on the second side, and a control value of the second bend mechanism is set so as to narrow the gap between the pair of rolling rolls at the end of the second side.

6. An electrode rolling apparatus according to claim 5.

8. The control device includes: when a transport speed of the electrode sheet by the transport device is equal to or higher than a predetermined threshold speed, the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism are controlled so as to reduce a larger one of the deviations ΔTwe and ΔTwc and a larger one of the deviations ΔTde and ΔTdc; when the transport speed of the electrode sheet by the transport device is lower than the threshold speed, control values ​​of the first gap adjustment mechanism, the second gap adjustment mechanism, the first bending mechanism, and the second bending mechanism are maintained.

2. The electrode rolling apparatus according to claim 1.

9. The conveying path is provided downstream of the rolling device, and further includes a first thickness measuring device that measures a thickness Tc of the central portion, a thickness Twe of the end portion on the first side, a thickness Tde of the end portion on the second side, a thickness Twc of the first intermediate portion, and a thickness Tdc of the second intermediate portion of the electrode sheet after rolling.

2. The electrode rolling apparatus according to claim 1.

10. A second thickness measuring device is further provided upstream of the rolling device in the transport path, which measures a thickness Tc0 of the central portion, a thickness Twe0 of the end portion on the first side, a thickness Tde0 of the end portion on the second side, a thickness Twc0 of the first intermediate portion, and a thickness Tdc0 of the second intermediate portion of the electrode sheet before rolling, 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 thicknesses Tc0, Twe0, Tde0, Twc0, and Tdc0.

2. The electrode rolling apparatus according to claim 1.

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