JP2000228188A - Winding method of electrode sheet and winding device usable in it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding method and a winding device of an electrode sheet, for correcting the position of an end part of an electrode sheet. SOLUTION: This winding method of an electrode sheet 1 is used for forming a wound type electrode body by running and simultaneously winding the lengthy electrode sheet 1 equipped with an active material layer. An intermediate roll 4 assigned to the running electrode sheet 1 is used, and the position of an end 1X in the width direction of the running electrode sheet 1 is detected. When the position of the end 1X is displaced from the regular position, the angle of the shaft center of the intermediate roll 4 relative to the running direction of the electrode sheet 1 is changed to thereby correct the position of the end 1X in the width direction of the running electrode sheet 1. The position of the end part can be corrected, even when the position of the end in the width direction of the electrode sheet 1 is displaced in the width direction in the middle of winding. Therefore, this method is advantageous for obtaining a wound type electrode body having uniform end positions in the width direction of the electrode sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a long electrode sheet while the electrode sheet is running, while winding the electrode sheet.

[0002]

2. Description of the Related Art Conventionally, in a power supply for a battery or a capacitor, a wound electrode body formed by winding a long electrode sheet provided with an active material layer into a roll shape has been used. I have. In the wound electrode body, it is preferable that the ends in the width direction of the electrode sheet are aligned.

Japanese Patent Application Laid-Open No. Hei 9-208093 discloses a hanging shaft for feeding an electrode sheet, a winding shaft for winding the electrode sheet in a roll shape, and a detector for detecting the position of the widthwise end of the electrode sheet. And a driving unit that moves the position of the hanging shaft along the width direction of the electrode sheet, and winds the electrode sheet supplied from the hanging shaft onto a winding shaft. When the position of the end portion in the width direction of the electrode sheet is displaced from the normal position in the width direction, the hanging portion is moved along the width direction of the electrode sheet by the driving unit, thereby displacing the end portion in the width direction of the electrode sheet. To adjust.

[0004]

The present invention corrects the position of the end of the electrode sheet by adopting a method different from the method of moving the hanging shaft along the width direction of the electrode sheet as described above. An object of the present invention is to provide a winding method of an electrode sheet and a winding device that can be used for the method.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for winding an electrode sheet, which comprises winding an elongated electrode sheet provided with an active material layer while running the electrode sheet to form a wound electrode body. A method of winding a sheet, using an intermediate roll applied to a traveling electrode sheet, detecting a position of an end in a width direction of the traveling electrode sheet, and displacing the position of the end from a regular position. In addition, the angle of the axis of the intermediate roll with respect to the traveling direction of the electrode sheet is changed to correct the position of the end of the traveling electrode sheet in the width direction.

An apparatus for winding an electrode sheet according to the present invention implements the above-described method, and winds and rolls a long electrode sheet having an active material layer.
An electrode sheet winding device to be a wound electrode body, an intermediate roll applied to the traveling electrode sheet,
Roll angle adjusting means for adjusting the angle of the axis of the intermediate roll with respect to the traveling direction of the traveling electrode sheet, and sheet displacement detection for detecting that the widthwise end of the traveling electrode sheet has been displaced from a regular position. Means, and a controller for changing the angle of the axis of the intermediate roll with respect to the running direction of the electrode sheet based on the detection by the sheet displacement detecting means, and correcting the position of the widthwise end of the running electrode sheet. It is characterized by having.

[0007]

According to the method and apparatus of the present invention, a long electrode sheet having an active material layer is used. The electrode sheet can be generally formed by laminating an active material layer on a sheet-like current collector. The electrode sheet is generally used for a power supply of a battery or a capacitor. The active material layer may be laminated on only one side of the current collector, or may be laminated on both sides of the current collector. The active material layer includes a component for performing a power supply function of a power supply such as a battery or a capacitor.

[0008] The intermediate roll is applied to a running electrode sheet. The intermediate roll may have a non-rotating structure or a structure that is driven and rotated by a traveling electrode sheet. According to the method of the present invention, the position of the end in the width direction of the traveling electrode sheet is detected. In the detection, the detection may be performed by using a sheet displacement detection unit, or may be detected by the operator with the naked eye. The sheet displacement detecting means may be a contact type that detects displacement of the position of the end of the electrode sheet by contacting the electrode sheet, or may be a contact type that detects the position of the end of the electrode sheet in a non-contact state with the electrode sheet. May be of a non-contact type for detecting the displacement of. When the sheet displacement detecting means is a contact type, a micro switch or the like can be employed. When the sheet displacement detecting means is a non-contact type, an optical sensor, an electrostatic sensor, or the like can be formed. In the case of an optical sensor, an irradiation unit that irradiates light such as a laser beam,
It can be formed using a light receiving unit that receives light such as a laser beam.

When the end of the running electrode sheet in the width direction is displaced from the normal position in the width direction, the angle of the axis of the intermediate roll with respect to the running direction of the electrode sheet is changed. Thereby, the electrode sheet is moved in the width direction thereof, and the position of the end of the electrode sheet in the width direction is corrected. In changing the angle of the axis of the intermediate roll, a roll angle adjusting means for adjusting the angle of the axis of the intermediate roll with respect to the traveling direction of the traveling electrode sheet is provided,
The angle of the axis of the intermediate roll with respect to the running direction of the electrode sheet can be adjusted by the roll angle adjusting means. Alternatively, the operator may adjust the angle of the axis of the intermediate roll.

The above-described roll angle adjusting means can be formed by using an actuator having a mechanism for rotating the intermediate roll. Gear mechanism as the actuator part,
It can be formed using a link mechanism. As a drive source of the actuator unit, a motor mechanism or a cylinder mechanism can be adopted.
As the motor mechanism, for example, a pulse motor whose driving amount is defined according to the number of input pulses can be used. The cylinder mechanism may be either a hydraulic type or a pneumatic type.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, an apparatus according to the present embodiment will be described. As shown in FIG. 1, the apparatus according to the present embodiment winds an elongated electrode sheet 1 provided with an active material layer 12 while running the electrode sheet 1 to form a wound electrode body 1 </ b> M. It is.

The present apparatus is provided with rollers 10a and 10c for transporting a continuous current collector plate 10 (aluminum) made of a metal sheet. A coater 2 that can function as a coating unit is provided. The active material layer 1 is applied to the current collector plate 10 by the coater 2 by applying the active material.
2 is coated on the current collector 10. Thereby, the electrode sheet 1 is formed.

Therefore, the electrode sheet 1 is composed of a current collector plate 10 having a continuous sheet shape and an active material layer 12 coated on the current collector plate 10. The electrode sheet 1 is shown in FIG.
As shown in FIG. 2A, the active material layer 12 (12A) may be coated on only one side of the current collector plate 10, and FIG.
As shown in (B), a form in which the active material layers 12 (12A, 12B) are coated on both surfaces of the current collector plate 10 may be used.

Further, in this embodiment, as shown in FIG. 1, the drying furnace 3, the metal intermediate roll 4, the metal tension roll 5, A winding shaft 6 is provided. The drying furnace 3 is for drying the active material layer 12 of the electrode sheet 1 and is provided near the coater 2. Winding shaft 6
Is located at the end of the electrode sheet 1 in the traveling direction (the direction of the arrow A1), and winds the electrode sheet 1 in a roll shape.

The intermediate roll 4 is applied to the traveling electrode sheet 1. As shown in FIG. 3, the intermediate roll 4 includes a large-diameter portion 40 having an outer peripheral surface, a small-diameter portion 42 coaxially connected to an end of the large-diameter portion 40, and one end of the small-diameter portion 42 in the axial direction. A pivot shaft 44 for pivotally supporting the portion 42a and allowing the intermediate roll 4 to pivot, and the other end 4 of the small diameter portion 42 in the axial direction.
2c, a projection-shaped engaging portion 42w provided on the
And a guide portion 46 having a guide groove 46a for guiding 2w.

The intermediate roll 4 has a non-rotating structure that does not rotate in the circumferential direction. The tension roll 5 shown in FIG. 1 applies tension to the traveling electrode sheet 1. The tension roll 5 has a driven rotation structure that is driven to rotate by a frictional force with the electrode sheet 1 in a circumferential direction thereof. The axial length of the intermediate roll 4 and the axial length of the tension roll 5 are larger than the width direction of the electrode sheet 1.

Further, as shown in FIG. 3, a roll angle adjusting means 7 is provided. The roll angle adjusting means 7 has a function of moving the engaging portion 42w of the other end 42c of the small diameter portion 42 of the intermediate roll 4 in the directions of arrows X1 and X2. With this function, the axis Pa of the intermediate roll 4 is tilted, and the axis P of the intermediate roll 4 with respect to the traveling direction of the electrode sheet 1 (the direction of the arrow A1).
Adjust the angle of a.

The roll angle adjusting means 7 includes an actuator 72 for moving the other end 42c of the intermediate roll 4 in the directions of arrows X1 and X2, a motor 74 for operating the actuator 72, and a drive circuit 76 for driving the motor 74. And As shown in FIG. 3, sheet displacement detecting means 8 (8R, 8L) is provided near the intermediate roll 4. The sheet displacement detecting means 8 is provided for the traveling electrode sheet 1.
Is detected that the position of the end 1x in the width direction has been displaced from the normal position in the width direction. When the position of the end 1x in the width direction of the running electrode sheet 1 is displaced rightward in the figure from the regular position, the sheet displacement detecting means 8R that has detected this detects inputs the detection signal MR to the controller 85.

Further, when the position of the end portion 1x in the width direction of the running electrode sheet 1 is displaced from the regular position in the width direction to the left in the drawing, the sheet displacement detection means 8 which detects this is detected.
L inputs the detection signal ML to the controller 85. When the detection signal MR is input to the controller 85, the controller 85 inputs a control signal MB based on the detection signal MR to the drive circuit 76. As a result, the motor 74 is controlled, and the intermediate roller 4
Tilt in one direction.

When the detection signal ML is input to the controller 85, the controller 85 inputs a control signal MB based on the detection signal ML to the drive circuit 76. As a result, the motor 74 is controlled, and the intermediate roll 4 is tilted in the arrow X2 direction by the actuator section 72. In this manner, in the present embodiment, the traveling direction of the electrode sheet 1 (arrow A1)
The angle of the axis Pa of the intermediate roll 4 with respect to the (direction) is adjusted.

In use, as can be understood from FIG. 1, an active material layer 12 is applied and coated by a coater 2 on a metal current collector plate 10 having a continuous sheet shape to form an electrode sheet 1. . The active material layer 12 of the electrode sheet 1 is dried in the drying furnace 3, and the solvent contained in the active material layer 12 is dried and removed. The electrode sheet 1 that has undergone the drying process passes through the intermediate roll 4 and the tension roll 5, reaches the take-up shaft 6, and is wound around the take-up shaft 6 in the form of a roll to form a wound electrode body 1M.

As shown in FIG. 3, the traveling electrode sheet 1
When the position of the end 1x is a regular position in the width direction, the axis Pa of the intermediate roll 4 corresponds to the width direction of the electrode sheet 1, and the engagement portion 42 of the small diameter portion 42 of the intermediate roll 4
w is at the neutral position CA. However, as shown in FIG. 4, the position of the end portion 1x of the traveling electrode sheet 1 is shifted from the regular position to the right side in the width direction (R direction in the drawing) by α1.
May be displaced. At this time, the sheet displacement detecting means 8R detects this, and a detection signal MR is input to the controller 85 from the sheet displacement detecting means 8R. When the detection signal MR is input to the controller 85, the detection signal M
A control signal MB based on R is input to the drive circuit 76 by the controller 85.

As a result, as shown in FIG. 5, the engaging portion 42w of the intermediate roll 4 is moved along the guide groove 46a of the guide portion 46 in the direction of arrow X1, that is, on the drying furnace 3 side.
Therefore, the axis Pa of the intermediate roll 4 is inclined at the angle θ1. As a result, the electrode sheet 1 is gradually moved leftward in the drawing (L direction in the drawing) and is corrected. As shown in FIG. 6, the force F1 for pulling the electrode sheet 1 by the intermediate roll 4 can be considered as a vertical component F2 and a horizontal component F3. Electrode sheet 1
It is presumed that the position of the end 1x in the width direction is corrected due to the influence of the horizontal component force F3.

After the correction as described above, the electrode sheet 1
When the position of the end portion 1x returns to the normal position, the engaging portion 42w of the intermediate roll 4 returns to the neutral position CA by the actuator section 72, and the axis Pa of the intermediate roll 4 returns to the original position. Further, the position of the end 1x of the traveling electrode sheet 1 is shifted from the regular position in the width direction to the left side in the drawing (L direction in the drawing).
Is detected by the sheet displacement detection means 8L, the detection signal ML is input from the sheet displacement detection means 8L to the controller 85, and the control signal MB based on the detection signal ML is input to the drive circuit 76 by the controller 85. Is done. Thereby, the engaging portion 42w of the intermediate roll 4 is moved along the guide groove 46a of the guide portion 46 in the direction of the arrow X2, that is, in the direction away from the drying furnace 3 side. As a result, the electrode sheet 1 moves in the width direction thereof, and the displacement is corrected.

According to this embodiment, the intermediate roll 4
Is a non-rotating structure, so that when the electrode sheet 1 travels, there is a relative movement in the circumferential direction of the intermediate roll 4 between the outer peripheral surface 40 e of the large diameter portion 40 of the intermediate roll 4 and the electrode sheet 1. I do. Therefore, the large diameter portion 4 of the intermediate roll 4
The frictional form between the outer peripheral surface 40e of 0 and the electrode sheet 1 is a form in which the dynamic friction coefficient acts. The dynamic friction coefficient is smaller than the static friction coefficient. Therefore, it is presumed that the electrode sheet 1 is easily moved and corrected in the width direction thereof.

In this embodiment, initially, FIG.
As shown in FIG. 1, the active material layer 1 is formed only on one side of the current collector 10.
2 (12A) was applied and coated using the electrode sheet 1,
After drying the electrode sheet 1 in the drying furnace 3, the electrode sheet 1 is wound around a winding shaft 6. Thereafter, as shown in FIG. 2B, the electrode sheet 1 having a sandwich structure in which the active material layer 12 (12B) is applied to the other surface of the current collector plate 10 is used, and the electrode sheet 1 having the sandwich structure is dried. After drying in the furnace 3, it is wound on a winding shaft 6.

The above-described electrode sheet 1 having a sandwich structure
In the process of manufacturing the active material layer, one of the active material layers 12 (12
A) and the other active material layer 12 (12B) are the electrode sheet 1
In the width direction. In this case, there is a possibility that the target performance of the power supply such as a battery or a capacitor may not be sufficiently exhibited. In this regard, in the present embodiment, when the electrode sheet 1 is wound as described above, the end 1 in the width direction is used.
x can be aligned, so that one of the active material layers 12 (12
A) and the other active material layer 12 (12B) are advantageously matched in the width direction. Therefore, it can contribute to exhibiting the target performance of the power supply such as a battery and a capacitor.

Further, in this embodiment, as shown in FIG. 7, the winding shaft 6 and a winding motor 62 for rotating the winding shaft 6 are mounted on a movable base 64. The movable base 64 is movable along the width direction of the electrode sheet 1 along the guide part 66. When the electrode sheet 1 is largely displaced in the width direction thereof, the movable table 64 is moved by the driving source 68 along the width direction of the electrode sheet 1. Accordingly, even when the electrode sheet 1 is largely displaced in the width direction, it is advantageous to take up the electrode sheet 1 while suppressing the influence of the displacement. Therefore, in the present embodiment, it is more favorable to wind the electrode sheet 1 while aligning the ends 1x.

In the above-described embodiment, the axis of the intermediate roll 4 is adjusted by moving the other end of the intermediate roll 4 about one end in the axial direction of the axis as the center of rotation. However, the present invention is not limited to this. As in the other embodiment, both ends of the intermediate roll 4 in the axial direction can cooperate in the directions of arrows X1 and X2 to adjust the angle of the intermediate roll 4 about the central portion 44k in the axial direction as the rotation center. . In this case, there is an advantage that a change in tension applied to the electrode sheet 1 is reduced.

[0030]

According to the method of the present invention, it is possible to correct the position of the end portion of the electrode sheet even if the position of the end portion in the width direction is displaced in the width direction during winding. Therefore, it is advantageous to obtain a wound electrode body in which the widthwise end portions of the electrode sheet are aligned.

According to the apparatus of the present invention, the above-described method can be performed. That is, even when the position of the widthwise end of the electrode sheet is displaced in the widthwise direction during winding, the position of the end of the electrode sheet can be corrected. Therefore, it is advantageous to obtain a wound electrode body in which the widthwise end portions of the electrode sheet are aligned.

[Brief description of the drawings]

FIG. 1 is a side view of the entire apparatus.

FIG. 2 is a sectional view of an electrode sheet.

FIG. 3 is a plan view of a main part showing a state where an intermediate roll is at a neutral position.

FIG. 4 is a plan view of a main part showing a state where an electrode sheet is displaced in a width direction in a state where an intermediate roll is at a neutral position.

FIG. 5 is a plan view of a main part showing a state in which the electrode sheet displaced in the width direction is corrected.

FIG. 6 is an enlarged plan view of a main part showing a state where an electrode sheet displaced in a width direction is corrected.

FIG. 7 is a plan view near the winding shaft.

FIG. 8 is a plan view of a main part showing a state where an intermediate roll is in a neutral position according to another embodiment.

[Explanation of symbols]

In the figure, 1 is an electrode sheet, 1x is an end portion, 10 is a current collector, 1
Reference numeral 2 denotes an active material layer, 4 denotes an intermediate roll, 6 denotes a winding shaft, 7 denotes a roll angle adjusting unit, and 8 denotes a sheet displacement detecting unit.

Claims (2)

[Claims] 1. A method of winding an electrode sheet having an active material layer, the electrode sheet having a long shape running thereon being wound to form a wound electrode body, wherein the electrode sheet is applied to the running electrode sheet. Using an intermediate roll that is flattened, the position of the end of the running electrode sheet in the width direction is detected, and when the position of the end is displaced from a regular position,
A method for winding an electrode sheet, comprising: changing an angle of a shaft center of an intermediate roll with respect to a traveling direction of the electrode sheet to correct a position of an end portion in a width direction of the traveling electrode sheet. 2. An apparatus for winding an electrode sheet having an active material layer, wherein the electrode sheet has an elongated shape while being wound, and is wound into a wound electrode body. An intermediate roll to be removed; a roll angle adjusting means for adjusting an angle of an axis of the intermediate roll with respect to a traveling direction of the traveling electrode sheet; and a position of an end portion of the traveling electrode sheet in a width direction from a regular position. Sheet displacement detecting means for detecting that the sheet has been displaced; and, based on the detection by the sheet displacement detecting means, changing the angle of the axis of the intermediate roll with respect to the traveling direction of the electrode sheet, and in the width direction of the traveling electrode sheet. And a controller for correcting the position of the end of the electrode sheet.