JP2019169263A - Winding device - Google Patents

Abstract

To reduce displacement of an electrode sheet to be wound.SOLUTION: As shown in Fig. 1, a control arrangement 107 includes a first processing part 107a1, a second processing part 107a2, and a third processing part 107a3. The first processing part 107a1 is configured to execute processing for winding an electrode sheet S1 transported to a conveyance path 102 by rotating a reel 103. The second processing part 107a2 is configured to obtain a skew amount of the electrode sheet on the basis of a first edge position and a second edge position, wile the electrode sheet S1 is wound around the reel 103. The third processing part 107a3 is configured to control an edge position controller 104 so as to eliminate the skew amount of the electrode sheet, while the electrode sheet S1 is wound around the reel 103.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a winding device.

Japanese Patent Application Laid-Open No. 2011-246212 discloses an invention relating to a winding device that winds up an original fabric obtained by winding a belt-like electrode sheet into a roll shape. Here, the proposed winding device includes first detection means, correction means, second detection means, and reference value correction means.
The first detection means detects the position in the width direction of the sheet. The correcting unit corrects the positional deviation in the width direction of the sheet based on the detection result of the first detecting unit and a predetermined reference value. The second detection unit detects the position in the width direction of the sheet on the downstream side of the first detection unit and the correction unit. In the reference value correction means, the pre-winding correction reference value is corrected based on the detection result of the second detection means.

JP 2011-246212 A

  By the way, the strip-shaped electrode sheet may be curved in the width direction in the length direction. Furthermore, the electrode sheet wound around the winding shaft may be thick on one side in the axial direction of the winding shaft. Furthermore, an event may occur in which the position in the width direction of the sheet is abruptly shifted with respect to the winding shaft during winding. The timing at which the position in the width direction of the sheet starts to deviate rapidly with respect to the take-up shaft and the amount of deviation vary each time the electrode body is taken up. Furthermore, there is a case where the displacement of the electrode sheet cannot be solved well in the wound electrode body only by controlling the edge position of the electrode sheet.

The winding device proposed here includes a first shaft, a conveyance path, a winding shaft, an edge position controller, a first edge sensor, a second edge sensor, and a control device.
The first axis is an axis on which a reel on which an electrode sheet in which a layer containing active material particles is formed on a strip-shaped metal foil is wound is mounted. A conveyance path | route is a path | route along which the electrode sheet sent out from the reel is conveyed. The winding axis is an axis that winds up the electrode sheet conveyed to the conveyance path. The edge position controller is a mechanism for adjusting the position of the electrode sheet provided in the transport path. The first edge sensor is a sensor provided downstream of the edge position controller along the conveyance path. The second edge sensor is a sensor provided downstream of the first edge sensor along the conveyance path.

The control device includes a first processing unit, a second processing unit, and a third processing unit.
The first processing unit is configured to take up the electrode sheet conveyed to the conveyance path by rotating the winding shaft. The second processing unit is configured to detect the first edge position of the electrode sheet detected by the first edge sensor and the second position of the electrode sheet detected by the second edge sensor while the electrode sheet is wound on the winding shaft. The skew amount of the electrode sheet is obtained based on the edge position. The third processing unit is configured to control the edge position controller so that the skew amount of the electrode sheet is eliminated while the electrode sheet is wound on the winding shaft.
According to such a winding device, the displacement of the second edge position can be kept small.

FIG. 1 is a schematic diagram of the winding device 100. FIG. 2 is a schematic diagram of the electrode sheet S1 in this embodiment. FIG. 3 is a schematic diagram schematically showing the electrode sheet S1. FIG. 4 is a flowchart showing a part of the control flow of the control device 107. FIG. 5 is a graph showing the transition of the position of the electrode sheet and the edge reference position ex. FIG. 6 is a graph showing the transition of the position of the electrode sheet and the edge reference position ex.

  Hereinafter, an embodiment of the winding device proposed here will be described. The embodiments described herein are, of course, not intended to limit the present invention in particular. The invention is not limited to the embodiments described herein unless specifically stated.

FIG. 1 is a schematic diagram of the winding device 100.
As shown in FIG. 1, the winding device 100 includes a first shaft 101, a conveyance path 102, a winding shaft 103, an edge position controller 104, a first edge sensor 105, and a second edge sensor 106. And a control device 107.

  The first shaft 101 is a shaft on which a reel 101a around which an electrode sheet S1 in which a layer containing active material particles is formed on a strip-shaped metal foil is wound is mounted.

FIG. 2 is a schematic diagram of the electrode sheet S1 in this embodiment.
In the electrode sheet S1, an active material layer S1b including active material particles is formed on a strip-shaped metal foil S1a. In the strip-shaped metal foil S1a, an unformed portion S1c where the active material layer S1b is not formed is set along one edge in the width direction. The active material layer S1b includes an active material particle, and the active material layer S1b includes a binder, and is applied to the strip-shaped metal foil S1a. The active material layer S1b is formed on both surfaces of the strip-shaped metal foil S1a except for the unformed portion S1c. The active material layer S1b is pressed in the step of coating on the strip-shaped metal foil S1a. At this time, the strip-shaped metal foil S1a is rolled at the site where the active material layer S1b is formed. For this reason, in the width direction, the side on which the active material layer S1b is formed extends more than the unformed portion S1c. As a result, the electrode sheet S1 is curved in the width direction in the length direction, as shown in FIG.

  The conveyance path 102 is a path along which the electrode sheet S1 sent from the reel 101a is conveyed. The winding shaft 103 is a shaft for winding up the electrode sheet S <b> 1 conveyed to the conveyance path 102. A plurality of rollers 102 a are provided on the conveyance path 102. A path through which the electrode sheet S1 from the reel 101a to the winding shaft 103 passes is formed by the roller 102a. Further, not only the electrode sheet S1 but also other electrode sheets S2 and separators S3 and S4 are wound around the winding shaft 103 while being overlapped in a predetermined order.

  The edge position controller 104 is provided in the transport path 102. The edge position controller 104 is a device that adjusts the position in the width direction of the electrode sheet S <b> 1 wound around the winding shaft 103. A plurality of edge position controllers 104 can be provided in the transport path 102. In the case where a plurality of edge position controllers are provided in the transport path 102, the edge position controller 104 is the edge position controller closest to the winding shaft 103. A first edge sensor 105 and a second edge sensor 106 are provided on the transport path 102 between the edge position controller 104 and the winding shaft 103.

  The first edge sensor 105 is a sensor provided downstream of the edge position controller 104 along the transport path 102. That is, the first edge sensor 105 is a sensor for detecting the position in the width direction of the electrode sheet S1 immediately after being sent out from the edge position controller 104. In other words, the first edge sensor 105 detects the position in the width direction of the electrode sheet S <b> 1 whose edge position is controlled by the edge position controller 104. The position in the width direction of the electrode sheet S1 detected by the first edge sensor 105 is referred to as a “first edge position e1”.

  The first edge sensor 105 may be provided in the vicinity of the edge position controller 104 downstream of the edge position controller 104. For example, the conveyance speed of the electrode sheet S1 when being wound around the winding shaft 103 gradually increases from the beginning of the winding to reach a predetermined conveyance speed, and is gradually decelerated at the end of the winding. At this time, the first edge sensor 105 may be provided at a position closer than the distance that the electrode sheet S1 that has passed through the edge position controller 104 advances to a predetermined control period at a predetermined conveyance speed. Here, the predetermined control cycle is, for example, a control cycle Tb for controlling the edge position controller 104 based on the first edge position e1. The control cycle Tb may be defined by, for example, 10 milliseconds to 30 milliseconds (for example, 20 milliseconds). Note that the control cycle is not limited to the time exemplified here.

  The second edge sensor 106 is a sensor provided on the downstream side of the first edge sensor 105 along the conveyance path 102. The second edge sensor 106 may be arranged on the downstream side of the first edge sensor 105 at a predetermined distance. The distance from the first edge sensor 105 to the second edge sensor 106 may be set to be longer than the distance that the electrode sheet S1 travels in a predetermined control cycle Tb, for example. Here, the 1st edge sensor 105 is good to be arrange | positioned in the position of 20 mm-50 mm from the edge position controller 104 in the downstream of the edge position controller 104, for example. The second edge sensor 106 may be disposed at a position 300 mm to 500 mm from the edge position controller 104 downstream of the edge position controller 104. As described above, the first edge sensor 105 may be disposed at a position sufficiently close to the second edge sensor 106.

  The second edge sensor 106 can function as a sensor for detecting the skew amount Sx of the electrode sheet. The second edge sensor 106 is disposed at a position closer to the winding shaft 103 than the first edge sensor 105 in the transport path 102. For this reason, the second edge sensor 106 can detect the position in the width direction of the electrode sheet S <b> 1 wound around the winding shaft 103 with higher accuracy than the first edge sensor 105. The position in the width direction of the electrode sheet S1 detected by the second edge sensor 106 is referred to as “second edge position e2”.

  As illustrated in FIG. 1, the control device 107 includes a first processing unit 107a1, a second processing unit 107a2, and a third processing unit 107a3. Here, the control device 107 is a device that performs various processes of the transport device 100.

  The control device 107 can be realized by, for example, a computer that is driven in accordance with a predetermined program. Specifically, each function of the control device 107 is an arithmetic device (also referred to as a processor, a CPU (Central Processing Unit), an MPU (Micro-processing unit)) or a storage device ( Memory, hard disk, etc.) and software. For example, each configuration and process of the control device 107 includes a database that stores data embodied by a computer in a predetermined format, a data structure, a processing module that performs predetermined arithmetic processing according to a predetermined program, and the like. Or it may be embodied as some of them.

  The first processing unit 107a1 is configured to perform a process of rotating the winding shaft 103 and winding the electrode sheet S1 conveyed to the conveyance path 102. In this process, the electrode sheet S <b> 1 sent out from the reel 101 a to the conveyance path 102 is wound around the winding shaft 103.

FIG. 3 is a schematic diagram schematically showing the electrode sheet S1.
As shown in FIG. 3, the second processing unit 107a2 is configured to obtain the skew amount Sx of the electrode sheet based on the first edge position e1 and the second edge position e2. FIG. 3 illustrates a state in which the electrode sheet S1 sent from the edge position controller 104 to the winding shaft 103 is shifted in the width direction. In FIG. 3, “e0” schematically indicates the reference position in the width direction of the electrode sheet S1.

  As shown in FIG. 3, in the processing of the second processing unit 107a2, the skew amount Sx of the electrode sheet is determined by the difference (Sx = e2-e1) between the first edge position e1 and the second edge position e2. Can be calculated. Here, the first edge position e <b> 1 is a position in the width direction of the electrode sheet S <b> 1 whose edge position is controlled by the edge position controller 104. The second edge position e2 is a position in the width direction of the electrode sheet S1 at the position where the second edge sensor 106 is provided. The skew amount Sx of the electrode sheet is an amount by which the conveyed electrode sheet S1 is shifted in the width direction between the position where the first edge sensor 105 is provided and the position where the second edge sensor 106 is provided. .

  The third processing unit 107a3 is configured to control the edge position controller 104 so that the skew amount Sx of the electrode sheet is eliminated. In the third processing unit 107a3, for example, the edge reference position ex for controlling the edge position controller 104 may be shifted by the measured skew amount Sx of the electrode sheet.

  Here, the reference position for controlling the electrode sheet by the edge position controller 104 is stored in the control device 107 as the edge reference position ex. The control device 107 may store a predetermined initial edge reference position ex (0) as the edge reference position ex. For convenience, the edge reference position ex before update is ex (j). The updated edge reference position ex is ex (j + 1).

FIG. 4 is a flowchart showing a part of the control flow of the control device 107.
As shown in FIG. 4, the control device 107 acquires the edge reference position ex for each predetermined control cycle Tb. Further, the first edge position e1 is acquired and fed back (S22). Further, the edge position controller 104 is controlled so that the edge position of the electrode sheet approaches the edge reference position ex based on the first edge position e1 (S23).
The process (S12) of the second processing unit 107a2 is configured such that the skew amount Sx of the electrode sheet is obtained for each predetermined control cycle Ta while the electrode sheet S1 is wound around the winding shaft 103. It is good to be. The process (S13) of the third processing unit 107a3 is based on the skew amount Sx of the electrode sheet obtained for each predetermined control cycle Ta while the electrode sheet S1 is wound around the winding shaft 103. The edge reference position may be set to be updated.

  In this embodiment, in the third processing unit 107a3, the edge reference position ex (j) before being updated is shifted in a direction to eliminate the skew amount Sx of the electrode sheet. The updated edge reference position ex (j + 1) is calculated, for example, as ex (j + 1) = ex (j) −Sx. That is, the edge reference position ex controlled by the edge position controller 104 is shifted to the opposite side from the side where the electrode sheet is shifted in the width direction by the skew amount Sx.

  By the processing of the third processing unit 107a3, the edge reference position ex when the edge position controller 104 is controlled is the second processing unit from the initial edge reference position ex (0) every predetermined control cycle Ta. The skew amount Sx obtained at 107a2 is updated by increments. That is, the edge reference position ex for controlling the edge position controller 104 is updated every control cycle Ta. Then, by controlling the edge position controller 104 based on the updated edge reference position ex, the position in the width direction of the electrode sheet S1 immediately after passing through the edge position controller 104 approaches the updated edge reference position ex. It is done.

5 and 6 are graphs showing the transition of the position of the electrode sheet and the edge reference position ex. The vertical axis indicates the position of the electrode sheet, and the horizontal axis indicates time.
FIG. 5 shows a case where the edge reference position ex (0) of the edge position controller 104 is fixed. FIG. 6 shows a case where the above-described second processing unit 107a2 and third processing unit 107a3 are executed. In FIG. 5 and FIG. 6, as shown in FIG. 2, an unformed portion S1c is set along one edge in the width direction of the strip-shaped metal foil S1a, and the metal foil S1a is excluded except for the unformed portion S1c. Each of the electrode sheets S1 coated with the active material layer S1b is used.

  When the edge reference position ex (0) of the edge position controller 104 is fixed, as shown in FIG. 5, as the winding proceeds, the skew amount Sx of the electrode sheet increases at a certain timing. Then, the second edge position e2 is greatly deviated from the target position (here ex (0)). In the example shown in FIG. 5, the second edge position e2 is shifted beyond the allowable range e (+) to e (−) set for the target position.

  In the case of FIG. 5, the edge reference position ex (0) of the edge position controller 104 may be shifted in advance before predicting the direction or amount of displacement of the electrode sheet S1. For example, in the example of FIG. 5, by setting ex (0) to be shifted to the e (+) side in advance, the second edge position e2 detected by the second edge sensor 106 is moved to the e (+) side. Shift. For this reason, the displacement of the second edge position e2 may fall within the allowable range e (+) to e (−). However, when the skew amount Sx of the electrode sheet is larger than expected or when the electrode sheet S1 is suddenly shifted from the middle of winding, the displacement of the second edge position e2 is within the allowable range e (+) to e ( -) May not fit.

  On the other hand, when the second processing unit 107a2 and the third processing unit 107a3 described above are executed, as shown in FIG. 6, the electrode sheet is skewed at each predetermined control cycle Ta. A quantity Sx (e2-e1) is detected. Then, the edge reference position ex is updated based on the skew amount Sx of the electrode sheet. For this reason, while the electrode sheet S1 is being wound around the winding shaft 103, the edge reference position ex is updated so as to be shifted to the side opposite to the skew amount Sx of the electrode sheet. As shown in FIG. 6, the skew amount Sx of the electrode sheet is suppressed to be small, and the displacement of the second edge position e2 is small. For this reason, it is not necessary to predict the direction and amount of displacement of the electrode sheet S1. There is no need to shift the edge reference position ex (0) of the edge position controller 104 in advance before starting winding. Even when the electrode sheet S1 is suddenly shifted from the middle of winding, the displacement of the second edge position e2 can be within the allowable range e (+) to e (−).

  The control cycle of the control device 107 proposed here may be Ta> Tb. That is, the predetermined control cycle Ta in which the processing S12 of the second processing unit 107a2 and the processing S13 of the third processing unit 107a3 are executed is longer than the predetermined control cycle Tb for controlling the edge position controller 104. It should be set long. In other words, a predetermined control cycle Ta for obtaining the skew amount Sx of the electrode sheet and updating the edge reference position ex includes a process S21 for obtaining the edge reference position ex and a process S22 for obtaining the first edge position e1. And it is good that it is longer than the control cycle Tb of the process S23 for controlling the edge position controller 104.

  If Ta is longer than Tb, the edge reference position ex is updated when the edge reference position ex is updated and the control of the edge position controller 104 based on the edge reference position ex progresses to some extent. As a result, the control of the edge position controller 104 is easily stabilized. In this case, Ta is preferably set to about 2 to 4 times (for example, 3 times) Tb. It should be noted that how long Ta is made with respect to Tb depends on whether the skew amount Sx of the electrode sheet is kept small, the displacement of the second edge position e2 is small, and the control of the edge position controller 104 is It is good to set it so that it may be stable.

  In addition, the second processing unit 107a2 obtains the skew amount Sx of the electrode sheet, but the process for obtaining the skew amount Sx of the electrode sheet is obtained every control cycle Tb for controlling the edge position controller 104. Good. In this case, the third processing unit 107a3 obtains an average value of the skew amount Sx of the electrode sheet obtained during a predetermined control cycle Ta, and based on the average value of the skew amount Sx of the electrode sheet. Thus, the edge reference position ex may be updated in a direction in which the skew amount Sx of the electrode sheet is eliminated.

  The winding device proposed here has been variously described. Unless specifically mentioned, the embodiments of the winding device mentioned here do not limit the present invention.

100 winding device 101 first shaft 101a reel 102 conveyance path 102a roller 103 winding shaft 104 edge position controller 105 first edge sensor 106 second edge sensor 107 control device 107a1 first processing unit 107a2 second processing unit 107a3 third processing unit e0 Reference position in the width direction of the electrode sheet S1 First edge position e2 Second edge position ex Edge reference position S1 Electrode sheet S1a Metal foil S1b Active material layer S1c Unformed part S2 Other electrode sheets S3, S4 Separator Sx Quantity Ta Control cycle Tb for updating the edge reference position Control cycle for controlling the edge position controller 104

Claims (1)

A first shaft on which a reel on which an electrode sheet in which a layer containing active material particles is formed on a band-shaped metal foil is wound is mounted;
A conveyance path through which the electrode sheet fed from the reel is conveyed;
A winding shaft for winding up the electrode sheet transported to the transport path;
An edge position controller provided in the transport path;
A first edge sensor provided downstream of the edge position controller along the transport path;
A second edge sensor provided on the downstream side of the first edge sensor along the conveyance path;
A control device,
The controller is
A first processing unit that rotates the winding shaft and winds up the electrode sheet transported to the transport path;
While the electrode sheet is being wound around the winding shaft, the first edge position of the electrode sheet detected by the first edge sensor and the second of the electrode sheet detected by the second edge sensor. A second processing unit for obtaining a skew amount of the electrode sheet based on an edge position;
A winding device comprising: a third processing unit that controls the edge position controller so that the skew amount of the electrode sheet is eliminated while the electrode sheet is being wound around the winding shaft.

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