JP2011042458A - Web carrying device, method thereof and method of manufacturing battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a web carrying device, a method thereof and a method of manufacturing a battery properly aligning a width of respective webs after cutting, by adjusting a carrying position of the webs in response to a position of a slitter blade. <P>SOLUTION: This web carrying device has a slitter roller set 30 for cutting the web along its longitudinal direction, a meandering correcting part 20 for adjusting a position in the width direction of web supply upstream in the carrying direction from that set, edge sensors 41-44 for detecting the width of the respective webs downstream in the carrying direction from the slitter roller set 30, a web position control part 50 for operating the meandering correction part 20 to become equal in the width of the respective webs by feedback control based on its sensor value, and a low-pass filter processing part to be inputted to the web position control part 50 by applying low-pass filter processing of cutting off a high frequency component of a predetermined frequency or more to a detection value by the edge sensors. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a web transport apparatus and method for transporting a strip-shaped thin plate (hereinafter referred to as web), for example, used in a process of manufacturing a battery electrode plate and the like, and a battery manufacturing method. More specifically, the present invention relates to a web conveying apparatus and method for performing meandering correction control before and after the web cutting process is included in the manufacturing process, and a battery manufacturing method.

  For example, an electrode plate used for a lithium ion battery is manufactured by coating an active material on both surfaces of a strip-shaped metal foil. For example, the active material paste is applied to both sides of the metal foil, the applied active material paste is dried, the dried active material paste is rolled with the metal foil, and the rolled active material paste is cut with the metal foil. . For this purpose, the web is sequentially unwound from a roll of metal foil (web roll), and each step is carried out while the web is being transported to manufacture an electrode plate.

  Conventionally, in a web transport device for transporting a web, meandering correction control for correcting a shift in the width direction of the web has been performed (for example, see Patent Document 1). In this document, for example, an apparatus for detecting the position of one edge of a web by an edge sensor is disclosed. In this apparatus, the conveying roller is moved in the width direction so that the edge of the web is at a desired position. There is also disclosed an apparatus in which sensors are provided at both edges of the web to correct fluctuations in the center of the web.

JP 2001-226005 A

  In the above-described conventional meandering correction control, the target position of the web conveyance path is determined in advance, and the web is controlled so as to approach the position. However, in a web conveyance device including a step of cutting a web along the longitudinal direction, it may be required to make the widths of the webs after being cut uniform. In this case, it is necessary to perform control so that the position of the web is aligned with the position of the slitter blade that cuts the web. However, the position of the slitter blade is not necessarily stationary. For example, since the slitter blade is a consumable part, it needs to be replaced as appropriate, and the position of the slitter blade may be slightly shifted before and after the slitter blade is replaced.

  Further, in some cases where the slitter blade is mounted on the slitter roller, there is a slitter roller provided with a driving portion for rotational driving at one end portion thereof. In such a case, the drive unit generates heat due to continuous driving, and the slitter blade may change its position in the axial direction. This is because, for example, the slitter roller and the drive unit itself are slightly extended in the axial direction due to heat. Therefore, there is a problem that the width of the web after cutting changes somewhat even during continuous production.

  The present invention has been made in order to solve the problems of the above-described conventional conveying apparatus. In other words, the problem is that a web transport device that can adjust the web transport position in accordance with the position of the slitter blade and appropriately align the width of each web after cutting, its method, and a battery manufacturing method. It is to provide.

  In order to solve this problem, the web transport device of the present invention is provided between a web supply unit, a web collection unit, and between the web supply unit and the web collection unit, and cuts the web along its longitudinal direction. A web transport device having a slit section that cuts at the slit section and collects it at the web collection section while transporting the web supplied from the web supply section, and supplies the web upstream of the slit section in the transport direction. The width direction position adjusting member that adjusts the position in the width direction of the web, the web width sensor that detects the width of each web downstream of the slit portion in the transport direction, and feedback control based on the detection value by the web width sensor, The width direction position control unit that operates the width direction position adjustment member so that the widths are equal, and the detected value by the web width sensor have a high frequency equal to or higher than a predetermined frequency. And has a low-pass filter processing unit that inputs the widthwise position control portion performs a low pass filtering process for cutting off the component.

  According to the web conveyance device of the present invention, the web is cut along the longitudinal direction while being conveyed, and the width of each web after the cutting is detected by the web width sensor. Furthermore, feedback control is performed based on the detected value so that the widths of the webs become equal. At that time, a low-pass filter process is applied to the detection value by the web width sensor to cut off the high frequency component. In this way, it is possible to remove noise and control only slow displacement. For example, it is possible to appropriately cope with the displacement of the blade position in the slit portion due to heat. Therefore, the web transport position is adjusted in accordance with the position of the slitter blade, and the width of each web after cutting is appropriately aligned.

The present invention further includes a web position sensor that is disposed downstream of the width direction position adjusting member in the transport direction and upstream of the slit portion in the transport direction, and detects the width direction position of the web. The control unit takes the value obtained by subtracting half the difference between the widths of the webs detected by the web width sensor from the position detected by the web position sensor as the target position, so that the position detected by the web position sensor approaches the target position. It is desirable to operate the width direction position adjusting member.
If this is the case, the target position is set while transporting, and control is performed so that there is no difference in the width of each web.

The web transport method of the present invention is a web transport method in which the web is transported in the longitudinal direction while being adjusted in the width direction by the width direction position adjusting member, and the web is cut along the longitudinal direction by the slit portion. The width direction position adjusting member is configured so that the width of each web is detected by the web width sensor downstream of the slit portion by the web width sensor, and the width of each web is equalized by feedback control based on the detected width of each web. In addition, as the value of the width of each web in the feedback control, the value detected by the web width sensor is subjected to low-pass filter processing for cutting off high-frequency components of a predetermined frequency or higher.
According to this method, noise can be removed and the widths of the webs after cutting can be appropriately aligned.

Furthermore, in the present invention, after replacing the blade of the slit portion and before starting feedback control, the web is transported and cut by the slit portion, the width of each cut web is measured, and feedback control is performed based on the measurement result. It is desirable to determine the target position and start the operation of the width direction position adjusting member by feedback control so that the conveyance position in the width direction of the web approaches the determined target position.
In this way, even when there is a sudden displacement in the width of each web after cutting by exchanging the blades of the slit portion, it can be appropriately controlled.

Furthermore, in the present invention, it is desirable to update the target position of the feedback control as needed while transporting the web, and to operate the width direction position adjusting member so as to approach the updated target position.
In this way, even when the width of each cut web is gradually displaced due to, for example, heat generation, it can be controlled appropriately.

  In the present invention, the conductor foil web is transported in the longitudinal direction while adjusting the position in the width direction by the width direction position adjusting member, and the electrode plate is cut by cutting the web along the longitudinal direction by the slit portion. A battery manufacturing method for manufacturing a battery by enclosing the manufactured electrode plate together with an electrolyte in a case, wherein the web width sensor detects the width of each web on the downstream side in the transport direction from the slit portion, By feedback control based on the detected width of each web, the width direction position adjusting member is operated so that the width of each web becomes equal, and the detected value by the web width sensor exceeds the predetermined frequency as the width of each web. The present invention also extends to a battery manufacturing method that uses a low-pass filter that cuts off the high-frequency component.

  According to the web conveyance device, the method thereof, and the battery manufacturing method of the present invention, the web conveyance position can be adjusted in accordance with the position of the slitter blade, and the widths of the webs after cutting can be appropriately aligned.

It is a block diagram which shows the web conveyance process which concerns on this form. It is explanatory drawing which shows arrangement | positioning of each sensor. It is explanatory drawing which shows the structure of a meandering correction | amendment part and a slitter part. It is a processing block diagram for meander control. It is explanatory drawing which shows the detection value of an edge sensor, and the result of a low-pass filter process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to a manufacturing apparatus for manufacturing an electrode plate used in a lithium ion secondary battery.

  The lithium ion secondary battery manufactured using the manufacturing apparatus of this embodiment has a positive electrode plate coated with a positive electrode active material on both sides of an aluminum foil and a negative electrode active material applied on both sides of a copper foil. The negative electrode plate is used. This lithium ion secondary battery is, for example, a wound type secondary battery in which a separator sandwiched between these electrode plates is sealed in a case together with an electrolytic solution. The present embodiment is a transport device for transporting a web such as an aluminum foil, a copper foil, or an intermediate product on which an active material is placed when manufacturing the positive and negative electrode plates.

  First, a transport device used as a part of a manufacturing process of an electrode plate for a positive electrode will be described with reference to a block diagram shown in FIG. This conveying device unwinds the web from a winding roll in which the web is wound in a roll shape, and performs each processing while sequentially conveying the web in the direction indicated by the arrow in the figure. Then, the processed web is wound into a roll. As an unwinding roll for supplying the web to this transport device, for example, three pastes are spaced in the width direction along the longitudinal direction on an aluminum foil having a thickness of about 10 μm, a width of about 600 mm, and a length of about 4000 m. It is applied after opening and rolled into a roll.

As shown in FIG.
Unwinding part 1,
1st slitter part 2,
Reservoir part 3,
Press section 4,
Foil part press part 5,
Film thickness sensor 6,
CPC unit 7,
Second slitter section 8,
Ultrasonic cleaner 9,
Inspection unit 10,
Winding part 11,
These parts are provided in this order.

The unwinding unit 1 unwinds and supplies the web from the unwinding roll.
The 1st slitter part 2 is equipped with a cutting blade, and cut | disconnects continuously in a longitudinal direction in the location between the pastes which apply | coated as mentioned above at intervals. In this embodiment, two cutting blades are provided, and two foil portions not coated with paste are simultaneously cut out of the web unwound by the unwinding portion 1. Accordingly, the webs output from the first slitter unit 2 are three webs. Each of these three webs has a non-coated portion on both sides in the width direction and a paste applied in the center.

  The reservoir unit 3 conveys the three webs formed by the first slitter unit 2 and gradually increases the interval between them. Further, in the reservoir unit 3, the tension and the conveying speed of each of the three webs are adjusted so that the three webs are supplied to the next press unit 4 in a uniform manner.

The press unit 4 presses the web to which the paste is applied to increase the density of the paste portion and make the thickness uniform. At this time, it is known that the aluminum foil in the area where the paste is applied is also slightly affected by the press.
The foil part press part 5 presses the aluminum foil in a place where the press part 4 is not easily affected by the press, that is, the non-coated part. As a result, the non-coated portion is extended to the same extent as the coated portion, and the web is prevented from being bent.
The press unit 4 and the foil unit press unit 5 collectively process the three webs supplied from the reservoir unit 3 at intervals.

The film thickness sensor 6 inspects the thickness of the web. In particular, it is more desirable if the thicknesses of the aluminum foil and the paste portion can be acquired.
The CPC unit 7 adjusts the web conveyance position in the width direction by adjusting the tension and conveyance speed of the three webs and correcting the meandering. As a result, three webs are supplied to the next second slitter unit 8 in a line at substantially equal intervals.

The 2nd slitter part 8 is provided with a cutting blade, and cut | disconnects continuously in a longitudinal direction in the center position of a paste coating part about each of three webs. In this embodiment, three cutting blades are provided, and three webs are simultaneously cut to obtain a total of six webs. By being cut by the second slitter portion 8, a web having an uncoated portion only on one side of the paste portion is formed downstream from here.
The ultrasonic cleaner 9 removes dust and the like from the surface of each of the six webs using ultrasonic waves.

The inspection unit 10 inspects each of the six webs for defects in the paste or the like. Further, the inspection unit 10 adds a mark for displaying a defect to a portion of the web where it is determined that there is a defect in the processes so far. The web where this mark is added is ejected in a later process and is not used in the product.
The winding unit 11 winds six webs separately in a roll shape.

  Among these, as shown in FIG. 2, the CPC unit section 7 has meandering correction sections 20 that are independent for the three webs. The second slitter unit 8 has a slitter roller set 30 for cutting three webs into two to make a total of six webs. The meandering correction unit 20 is for adjusting the conveyance position in the width direction of the web W and correcting the meandering. In particular, the widths of the two webs after being cut by the slitter roller set 30 are controlled to be as equal as possible. The slitter roller set 30 is disposed downstream of the meandering correction unit 20 in the conveyance direction of the web W and cuts each web W into two along the longitudinal direction at the center position in the width direction. .

  FIG. 3 shows the control of one web W at the bottom of the three shown in FIG. 2 more specifically. The other webs W have the same configuration. As shown in FIG. 3, the meandering correction unit 20 includes four rollers 21, 22, 23, and 24, and corrects the conveyance position of the web W in the width direction. Each of the lower rollers 21 and 24 in the figure is a roller having a rotating shaft fixed at an appropriate position in the apparatus. The upper rollers 22 and 23 in the figure are swinging rollers whose both ends are fixed to each other by connecting bars 25 and 25, respectively. Thus, the rollers 22 and 23 are combined so as to be arranged in parallel at a predetermined distance, and are rotated integrally within the plane. In this embodiment, the center of rotation is a point P on the surface of the roller 22.

  Furthermore, in this embodiment, as shown in FIG. 3, two edge sensors 26 and 27 are provided between the roller 23 and the roller 24. The edge sensors 26 and 27 are for detecting the positions of the edges on both sides in the width direction of the web W conveyed between the rollers 23 and 24. By arranging them on both sides, the central control can be performed even when the width of the web W is slightly varied. Further, the width of the web W at this position can be acquired from the detection results of the edge sensors 26 and 27.

  Further, as shown in FIG. 3, the slitter roller set 30 includes a slitter roller 31 and a groove roller 32. The slitter roller 31 has a slitter blade 34 that protrudes and is fixed in the circumferential direction. The groove roller 32 has a groove 35 formed in the circumferential direction on the outer periphery. These are arranged in alignment so that the slitter blade 34 of the slitter roller 31 enters the groove 35 of the groove roller 32. The web W is cut by the slitter blade 34 and the groove 35. As shown in FIG. 2, the slitter roller set 30 of the present embodiment is provided with three slitter blades 34 and grooves 35 provided at an appropriate interval in one roller, and the three webs are converted into one slitter. The roller set 30 can be cut simultaneously.

  The slitter roller 31 and the groove roller 32 are arranged in parallel so that the outer peripheral surfaces thereof are in very close positions except for the slitter blade 34 and the groove 35. Further, as shown in FIG. 3, the slitter roller 31 and the groove roller 32 are respectively provided with rotational drive units 37 and 38 at one end in the axial direction. When manufacturing an electrode plate or the like, the slitter roller 31 and the groove roller 32 are rotated in the opposite directions at the same peripheral speed by the rotation driving units 37 and 38, respectively. As a result, the web W is sandwiched between the rollers and sent out at locations other than the slitter blade 34 and the groove 35.

  As shown in FIG. 3, the web W is hung on the four rollers 21, 22, 23, and 24 in this order in the meandering correction unit 20. In each roller, the conveyance direction is bent by about 90 °, and the conveyance position on the downstream side is adjusted by the swinging motion of the rollers 22 and 23. Then, the slitter roller set 30 is cut into two along the longitudinal direction so that the width becomes half. The webs W1 and W2 that have been cut into two are pulled out from the slitter roller set 30 at slightly different angles.

  As shown in FIG. 3, two sets of edge sensors 41, 42, 43, and 44 are arranged on the conveyance paths of the two webs W1 and W2, respectively. That is, the edge sensors 41 and 42 detect the edges on both sides of the web W1. Edge sensors 43 and 44 detect edges on both sides of the web W2. Accordingly, the widths of the cut webs W1, W2 can be acquired using the detection results of these edge sensors 41-44.

  Furthermore, in this embodiment, a web position control unit 50 for controlling the meandering correction unit 20 is provided. The web position control unit 50 feeds back the detection results of the edge sensors 26 and 27 to control the meandering correction unit 20 to align the web W. In this embodiment, the position of the web W that is the target of feedback control of the meandering correction unit 20 is determined so that the widths of the two webs W1, W2 after cutting are equal. A predetermined position based on the installation positions of the edge sensors 26 and 27 is not set as a target position. A method for determining the target position will be described later.

The web position control unit 50 feedback-controls the meandering correction unit 20 with the determined target position xd as a target. The target position xd is a target value at the center position of the web W. The speed command value v of the feedback control is given by the following formula 1.
v = KP × (xd−Δx) + KD × (d / dt) (xd−Δx) (Expression 1)

here,
KP is the feedback gain of the P component (proportional component) KD is the feedback gain of the D component (differential component) Δx is the center position of the web W obtained from the detection results of the edge sensors 26 and 27. If the width of the web W does not vary, the target position on one side of the web W may be given as xd, and only the detection result of the corresponding sensor may be used as Δx.

Next, the target position xd used in the above equation 1 will be described. In this embodiment, the target position xd is determined so that the widths of the webs W1 and W2 after cutting are equal. For this purpose, first, the widths of webs W1 and W2 and their differences are obtained. The widths of the webs W1, W2 are determined by either or both of the following (1) and (2).
(1) Create a small amount of cut webs W1, W2 and measure their widths.
(2) The edge positions are measured by the edge sensors 41 to 44, and the widths of the webs W1, W2 are calculated from the results.

  (1) is particularly effective immediately after, for example, the position of the slitter blade 34 is slightly shifted due to replacement or the like. This is because in such a case, a large deviation occurs relatively suddenly. Therefore, after the replacement of the slitter blade 34, the web W is slightly advanced and the new slitter blade 34 cuts the web W. And the width of each web W1, W2 after passing the 2nd slitter part 8 is measured. If the conveyance of the web W is stopped during the measurement, an accurate and lean measurement is possible. Using this measurement result, the width difference between the cut webs W1 and W2 can be obtained.

  (2) is effective, for example, for fluctuations in the position of the slitter blade 34 during continuous conveyance. The cause of this variation is, for example, that the rotational drive units 37 and 38 generate heat, and the length of the slitter roller set 30 changes due to the influence of the heat. This is because such fluctuations occur continuously little by little. According to this method, since it is possible to continuously measure while continuing the conveyance, it is possible to grasp the change state of the width.

  As shown in FIGS. 3 and 2, the edge sensors 41 to 44 are located slightly away from the meandering correction unit 20 on the downstream side in the transport direction. Therefore, when acquiring the target position xd by the method (2), it is necessary to consider the delay of the sensor value. Therefore, in calculating the widths of the webs W1 and W2 by the method (2), it is preferable to perform a low-pass filter process with a small cutoff frequency. For example, the variation in the widths of the webs W1 and W2 caused by the heat generated by the rotary drive units 37 and 38 usually changes gently with respect to time, and thus such processing is suitable. It is more preferable to use the width values of the webs W1, W2 obtained by the method (1) as the initial value.

  The web position control unit 50 according to the present embodiment sets a target position xd at which the difference is zero based on the width difference between the webs W1 and W2 obtained by the above (1) or (2). Then, the meandering correction unit 20 is feedback-controlled using the speed correction value v shown in the above equation 1. By doing so, the widths of the webs W1 and W2 after cutting are made equal by dealing with displacement of the slitter blades 34 caused by replacement of the slitter blades 34 and heat generation of the rotation drive units 37 and 38, etc. Can be controlled.

  Next, the control by the web position control unit 50 of this embodiment will be further described with reference to the block diagram of FIG. In the figure, the width acquisition units 51 and 52 for obtaining the widths w1 and w2 of the webs W1 and W2 according to the above (2) are shown surrounded by a two-dot chain line. The width acquisition unit 51 uses the detection results X41 and X42 of the edge sensors 41 and 42 to obtain the width w1 of the web W1. The width acquisition unit 52 is for obtaining the width w2 of the web W2 using the detection results X43 and X44 of the edge sensors 43 and 44.

In the width acquisition unit 51 that acquires the width w1 of one web W1, the value obtained by combining the detection results X41 and X42 of the edge sensors 41 and 42 and the width w10 of the web W1 obtained in (1) by the following expression 2. X1 is input to the low-pass filter L.
X1 = w10 + X41-X42 (Formula 2)
Here, X41 and X42 are values representing the edge position of the web W1 with the reference position fixedly provided in the apparatus as the origin. Each pair of edge sensors should be installed on the same straight line. It is desirable to arrange them at least parallel to each other.

As shown in FIG. 4, the low-pass filter L uses filter coefficients A and B that are uniquely obtained based on the cutoff frequency,
w1 = A × X1 + B × Y1 (Formula 3)
It can be expressed as. w1 is the width of the web W1 obtained as a result of the low-pass filter processing. Further, X1 is the current acquired value synthesized by Equation 2 above, and Y1 is the previous value of w1.

Here, the low-pass filter L represented by Expression 3 performs low-pass filter processing with a cut-off frequency set low. For example, the cut-off frequency may be about several tens of sec ⁻¹ . The detection values (X1, X2, etc.) of the sensor are those to which a high frequency component due to noise is applied to some extent, as indicated by a line S in FIG. By performing this low-pass filter processing, high-frequency components can be removed, and as shown by a broken line F in the figure, it can be grasped as a rough movement of the web width (or edge position) after cutting. This broken line F corresponds to a change in the position of the slitter blade 34 during the continuous conveyance (see (2) above).

Further, as shown in the lower part of FIG. 4, the width w2 of the other web W2 is obtained by the low-pass filter process similar to that of the expression 3 in the upper part. Further, from the difference between the obtained widths w1 and w2, the difference in the width of the web after cutting in the current state can be obtained. The position where this difference becomes 0 is the transport position that is the target of the web W before cutting. For example, the target position xd of the web W can be calculated by the following equation 4.
xd = (w1−w2) / 2 (Formula 4)
When the target is a web W having a constant overall width w, the target position may be determined as w1 = w / 2 by calculating only w1 without calculating w2.

  With the target position xd thus determined as a target, the transport position of the web W before cutting is controlled. For this purpose, as shown in FIG. 4, the target position xd and the position Δx acquired by the edge sensors 26 and 27 are input to the PID controller. The PID controller outputs the speed command v to the CPC unit unit 7 according to the above equation 1. The CPC unit 7 controls the transport position of the web W by swinging the rollers 22 and 23 based on the speed command v. By doing so, the meandering correction can be appropriately performed while gradually changing the conveyance target position xd of the web W so as to reduce the difference in the widths of the webs W1, W2 after cutting.

  Further, when the positive electrode plate and the negative electrode plate are manufactured using the web W conveying apparatus as described above, a battery can be manufactured using these as follows. A separator is sandwiched between the positive electrode plate and the negative electrode plate and wound together to produce a wound body. Further, the wound body is inserted into a battery case made of metal or the like. Inject the electrolyte into the battery case with the winding body inserted, and impregnate the winding body. With the electrode terminals connected to the two electrode plates protruding outside the battery case, the battery case is covered and sealed to complete the battery.

  As described above in detail, according to the transport device of this embodiment, the widths of the webs W1 and W2 after cutting are acquired, and the transport position of the web W before cutting is corrected so that the difference approaches 0. Further, since the widths of the webs W1, W2 can be acquired by the edge sensors 41 to 44 even during conveyance, it is possible to cope with the positional deviation of the slitter blade 34 due to continuous driving. Accordingly, the conveyance device can adjust the conveyance position of the web W in accordance with the position of the slitter blade 34 and can properly align the widths of the webs W1, W2 after cutting.

In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, in the above embodiment, the web W is cut into two. However, when the web W is cut into three or more at a time, the width of the two webs at both ends in the width direction can be applied by applying the present invention. Can be aligned.

DESCRIPTION OF SYMBOLS 1 Unwinding part 7 CPC unit part 8 2nd slitter part 11 Winding part 20 Meandering correction part 26,27,41,42,43,44 Edge sensor 30 Slitter roller assembly 50 Web position control part L Low-pass filter W Web

Claims (6)

A web supply section; a web collection section; and a slit section provided between the web supply section and the web collection section for cutting the web along a longitudinal direction thereof, and is supplied from the web supply section In a web transport device that cuts at the slit portion and collects at the web collection portion while transporting the web,
A width direction position adjusting member that adjusts the width direction position of the web supply on the upstream side in the transport direction from the slit portion;
A web width sensor for detecting the width of each web on the downstream side in the transport direction from the slit portion;
A width direction position control unit for operating the width direction position adjusting member so that the widths of the webs are equalized by feedback control based on a detection value by the web width sensor;
And a low-pass filter processing unit that performs a low-pass filter process for cutting off a high-frequency component equal to or higher than a predetermined frequency to a detection value by the web width sensor and inputs the detected value to the width-direction position control unit. apparatus. In the web conveyance apparatus of Claim 1,
A web position sensor that is disposed downstream of the width direction position adjusting member in the transport direction and upstream of the slit portion in the transport direction, and detects a web width direction position;
The width direction position control unit is
The target position is a value obtained by subtracting half of the difference between the widths of the webs detected by the web width sensor from the detection position by the web position sensor.
The web conveyance device, wherein the width direction position adjusting member is operated so that a detection position by the web position sensor approaches the target position. In the web transport method, the web is transported in the longitudinal direction while being adjusted in the width direction by the width direction position adjusting member, and the web is cut along the longitudinal direction by the slit portion.
The web width sensor detects the width of each web on the downstream side in the transport direction from the slit portion,
By operating the width direction position adjusting member so that the width of each web becomes equal by feedback control based on the detected width of each web,
The web width used in the feedback control is a value obtained by performing a low-pass filter process for cutting off a high-frequency component having a frequency equal to or higher than a predetermined frequency to a value detected by the web width sensor. Method. In the web conveyance method of Claim 3,
After replacing the blade of the slit part and before starting the feedback control,
Transport the web and cut it with the slits,
Measure the width of each web after cutting,
Based on the measurement result, the target position of the feedback control is determined,
A web conveyance method comprising: starting the operation of the width direction position adjusting member by the feedback control so that the conveyance position in the width direction of the web approaches the determined target position. In the web conveyance method of Claim 3,
A web conveyance method comprising: updating the target position of the feedback control as needed while conveying the web, and operating the width direction position adjusting member so as to approach the updated target position. The conductor foil web is transported in the longitudinal direction while adjusting the position in the width direction by the width direction position adjusting member, and the electrode plate is manufactured by cutting the web along the longitudinal direction by the slit portion. In a battery manufacturing method, a battery is manufactured by encapsulating an electrode plate together with an electrolyte in a case.
The web width sensor detects the width of each web on the downstream side in the transport direction from the slit portion,
By operating the width direction position adjusting member so that the width of each web becomes equal by feedback control based on the detected width of each web,
A method for manufacturing a battery, characterized in that the width of each web is obtained by subjecting a detection value of the web width sensor to a low-pass filter process for cutting off a high-frequency component equal to or higher than a predetermined frequency.

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