JP2018077984A - Winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device capable of effectively performing simplification and suppression of increase in a manufacturing cost while making it possible to easily removing a defect in a separator sheet.SOLUTION: A winding device 10 supplies two electrode sheets 4, 5 and two separator sheets 2, 3 to rotatable winding cores 13, 14 to manufacture a battery element made by winding the various types of sheets 2 to 5 by rotating the winding cores 13, 14. The winding device 10 comprises: detection means for detecting the presence/absence of a defect in part of the separator sheets 2, 3 corresponding to one element scheduled to be wound; and supply control means that, when the detection means detects the presence of a defect in part of the separator sheets 2, 3 corresponding to one element scheduled to be wound next, does not supply both electrode sheets 4, 5 to the winding cores 13, 14 and controls supply of the various types of sheets 2 to 5 so as to supply at least one including the defect of both separator sheets 2, 3 to the winding cores 13, 14.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a winding device for obtaining a winding element built in, for example, a secondary battery.

  For example, in a winding element used for a secondary battery such as a lithium ion battery, a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material are composed of two insulating materials. It is manufactured by being wound in a state of being overlapped via a separator sheet.

  In a winding device for manufacturing a winding element, both the electrode sheet and both separator sheets supplied from a roll wound in a roll are transported to a winding section along separate transport paths. . The winding unit includes, for example, a turret that is rotatably provided, and a plurality of winding cores that are arranged at predetermined intervals along the rotation direction of the turret and that can also rotate themselves (for example, , See Patent Document 1).

  Moreover, in the winding apparatus provided with the turret as described above, the winding element is manufactured as follows, for example. First, both separator sheets are wound around a core located at a predetermined first position. This is, for example, after welding both separator sheets to a core core provided on the outer periphery of the core, or after inserting both separator sheets through a slit provided in the core, and a predetermined amount of the core. Made by rotating only. Next, both electrode sheets are supplied to the core around which the separator sheet is wound. As a method for supplying both electrode sheets, for example, the electrode sheet is gripped by gripping means arranged in the conveyance path of the electrode sheet, and then the gripping means is moved closer to the core, and the electrode sheet is interposed between the separator sheets. The technique of sending in is mentioned. After supplying the electrode sheets, both the electrode sheets and both separator sheets are wound by rotating the winding core.

  When the winding amount of both electrode sheets reaches a predetermined amount, the rotation of the winding core is temporarily stopped, and both electrode sheets are cut. Next, when the turret is rotated, the core is moved from the first position to a predetermined second position while pulling out both separator sheets from the original fabric side. Subsequently, while cutting both the separator sheets extended from the winding core side of a 2nd position, rotating a winding core and winding up the termination | terminus part of both separator sheets, a winding element is obtained.

  By the way, some defect part (for example, a crack etc.) may exist in an electrode sheet or a separator sheet. In this case, if the winding element contains the defective portion, the quality of the winding element may be deteriorated.

  In view of this, a method has been proposed in which a defective portion removing device is provided and the defective portion in the electrode sheet is removed by the defective portion removing device (for example, see Patent Document 2). This method will be described more specifically. The defect portion removing device is provided corresponding to the electrode sheet conveyance path on the upstream side of the winding core, and has two cores that can rotate while gripping the electrode sheet. It has materials. And when there exists a defective part in an electrode sheet, when both core materials hold | grip an electrode sheet and rotate, the defective part in an electrode sheet is wound up. Thereafter, the electrode sheet is cut upstream of the defect portion removing device, and then both core members around which the defect portion is wound are retracted from the electrode sheet conveyance path, whereby the defect portion is removed.

JP 2009-289661 A JP 2012-151064 A

  By the way, it is conceivable that the above-described defect portion removing device is provided corresponding to the transport path of the separator sheet, and when the defect portion exists in the separator sheet, the defect portion in the separator sheet is wound up and removed.

  However, in this case, in order to remove the defective portion, it is necessary to separately provide a defective portion removing device (core material). Therefore, there is a possibility that the apparatus becomes complicated and the manufacturing cost increases.

  The present invention has been made in view of the above circumstances, and the purpose thereof is to make it possible to easily remove a defective portion in a separator sheet and to effectively simplify and suppress an increase in manufacturing cost. To provide an apparatus.

  In the following, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1.2 Supplying two electrode sheets and two separator sheets made of an insulating material to a rotatable winding core located on the downstream side, and by rotating the winding core, both the electrode sheets and the A winding device for manufacturing a winding element in which both separator sheets are wound,
Separator cutting means for cutting the separator sheet;
Detecting means for detecting the presence or absence of a defective portion in the separator sheet for one element to be wound;
When it is detected by the detection means that there is a defective portion in the separator sheet for one element to be wound next, the both electrode sheets are not supplied to the winding core. A supply control means for controlling the supply of the electrode sheet and the separator sheet so as to supply at least the side of the separator sheet where the defective portion exists to the core;
The separator sheet is wound such that the side wound around the core by the separator cutting means is separated from the upstream side after the defective portion of the separator sheet is wound by rotation of the core. A winding device characterized in that the winding device is cut.

  In addition, the separator sheet for one element means the separator sheet which comprises one winding element. Moreover, as a defect part, the damage | wound attached to the separator sheet, the connection part of the separator sheets affixed with the tape etc. can be mentioned.

  According to the means 1, when there is a defective portion in the separator sheet for one element to be wound next, both electrode sheets are not supplied to the winding core, and at least the defective portion of both separator sheets is not supplied. The existing side is fed into the core. Then, by rotating the winding core, the defective portion of the separator sheet is wound, and the separator winding means separates the side wound around the winding core (the side including the defective portion) from the upstream side. Thus, the separator sheet is cut. Thereby, the defective part of the separator sheet wound around the core can be easily removed. Further, since the defective portion can be wound using a core that is indispensable for manufacturing the winding element, it is not necessary to provide a part for winding the defective portion separately from the core. Therefore, it is possible to effectively simplify the apparatus and suppress the increase in manufacturing cost.

  In addition, when a defective part exists in a separator sheet, it is good also as winding only the side in which a defective part exists among both separators with a winding core, and good also as winding both separator sheets.

  Mean 2. When the supply control unit detects that there is a defective part in the separator sheet for one element to be wound next by the detection unit, the defective part exists in the two separator sheets. 2. The winding device according to claim 1, wherein supply of the separator sheet is controlled so that only the side is supplied to the winding core.

  According to the above means 2, only the side where the defective portion is present is supplied to the core of both separator sheets. That is, of the separator sheets, the side where no defect exists is not supplied to the core. And only the separator sheet in which a defective part exists is wound with a core. Therefore, it is possible to more reliably prevent a good separator sheet from being removed (discarded) in vain. As a result, yield can be improved and productivity can be increased.

Means 3. The supply control means includes
A first adsorption part capable of adsorbing one of the separator sheets;
A second adsorbing part capable of adsorbing the other of the separator sheets,
The winding core is movable along its own rotation axis direction and has at least a slit through which both the separator sheets can be inserted;
The core sheet moves in a state where the separator sheet is disposed at a position overlapping the slit along the rotation axis direction, and the separator sheet is inserted through the slit, so that the separator sheet is inserted into the core. Is configured to be supplied,
The first adsorbing part and the second adsorbing part respectively adsorb the separator sheet adsorbed to a position overlapping the slit along the rotation axis direction and a position deviating from the core along the rotation axis direction. 3. Winding device according to means 2, characterized in that it is operable to be arranged.

  According to the above means 3, when manufacturing a normal winding element (when there is no defect in both separator sheets for one element to be wound next), both separator sheets rotate the core. Both separator sheets can be supplied to the core by operating both suction portions so as to overlap the slit along the axial direction.

  Further, when there is a defective portion in the separator sheet for one element to be wound next, the separator sheet is placed so that only the separator sheet in which the defective portion exists overlaps the slit along the rotation axis direction. Operate the adsorbing part to adsorb. On the other hand, the adsorbing portion that adsorbs the separator sheet is operated so that the separator sheet having no defect portion is disposed at a position off the core along the rotation axis direction. In addition, by moving the core, only a separator sheet having a defective portion can be supplied to the core. Therefore, the separator sheet can be selectively supplied to the core with a relatively simple configuration. Thereby, simplification of an apparatus and increase suppression of manufacturing cost can be aimed at more effectively. In addition, although it is usually difficult to supply a thin and soft separator sheet to the core, according to the above means 3, the separator sheet can be easily supplied to the core.

Means 4. It has a turret that is rotatable and has a plurality of the cores at predetermined intervals in its own rotation direction.
The plurality of cores can be moved in and out of the turret by moving along the rotation axis direction,
The detection means is configured to execute a predetermined normal processing step when it is detected by the detection means that there is no defect in the separator sheet for one element to be wound next. Is configured to perform a predetermined removal processing step when it is detected that the defective portion is present,
The normal processing step and the removal processing step are common steps,
At least one of the separators is disposed at a position overlapping with the slit of the core disposed at a predetermined first position among the plurality of the cores along the rotation axis direction. Separator placement step to be placed;
After the separator arranging step, the separator core is supplied to the core by causing the core arranged at the first position to protrude from the turret and inserting the separator sheet into the slit of the core. A separator insertion step,
After the separator insertion step, the winding step in which the separator sheet is inserted into the slit is rotated, and the winding step in which the separator sheet is wound around the core;
After the winding step, by rotating the core, a winding step for winding the electrode sheet and the separator sheet supplied to the core, and
After the winding step, by rotating the turret, the turret rotation step of moving the winding core on which at least one or two separator sheets are wound to a predetermined second position;
A separator cutting step for cutting the separator sheet extending from the core disposed at the second position by the separator cutting means after the turret rotation step;
In the normal processing step,
In the separator arranging step, the both adsorbing portions are operated so that the separator sheets are arranged at a position overlapping the slit of the core arranged at the first position along the rotation axis direction,
After the winding step and before the winding step, supply both the electrode sheets to the core around which the both separator sheets are wound,
In the removal process step,
In the separator arranging step, after the separator sheets are adsorbed by the adsorbing portions, the separator sheet in which a defective portion exists is arranged in the first position along the rotation axis direction. The two adsorbing portions are operated so that the separator sheet that does not have a defective portion is disposed at a position that overlaps with the slit, and is disposed at a position that is separated from the core along the rotation axis direction.
4. The winding apparatus according to means 3, wherein both the electrode sheets are not supplied to the winding core around which the separator sheet is wound after the winding step and before the winding step.

  According to the means 4, first, different processing is performed in the normal processing step and the removal processing step in the separator arrangement step. That is, in the separator placement step of the normal processing step, both suction portions are operated so that the two separator sheets overlap with the slits of the winding core placed at the first position. For example, after the two separator sheets are gripped or adsorbed by both adsorbing units, both adsorbing units are operated so that the both separator sheets are arranged at a position overlapping the slit of the core. On the other hand, in the separator placement step of the removal processing step, after both the separator sheets are adsorbed by both adsorbing portions, only the separator sheet in which the defective portion exists is overlapped with the slit of the core arranged in the first position, Both suction portions are operated so that a separator sheet having no defective portion is detached from the winding core.

  In the subsequent separator insertion step, the same processing is performed in the normal processing step and the removal processing step. That is, the core disposed at the first position is protruded from the turret, and the separator sheet disposed at a position overlapping the slit of the core is inserted into the slit. Thereby, one or two separator sheets are supplied to the core.

  In the next winding step, the supplied one or two separator sheets are wound around the core. This winding process is similarly performed in the normal process and the removal process.

  Then, after the winding process and before the winding process, both electrode sheets are supplied to the core in the normal processing process. Therefore, in the subsequent winding process, both electrode sheets and both separator sheets are wound by the winding core. On the other hand, in the removal treatment process, both electrode sheets are not supplied to the core after the winding process and before the winding process. Therefore, in the winding process, only the separator sheet having the defective portion is wound by the winding core. The winding process in the normal processing process and the winding process in the removal processing process are the same in terms of the process of rotating the core in order to wind the sheet.

  In the subsequent turret rotation process, the winding core in the first position is moved to a predetermined second position by the rotation of the turret. This turret rotation process is similarly performed in the normal process and the removal process. With the rotation of the turret, one or two separator sheets wound around the core arranged at the second position extend upstream. Note that the state in which one separator sheet is wound around the winding core can occur when a defect portion exists in the separator sheet. On the other hand, the state in which two separator sheets are wound around the core is when there is no defect in both separator sheets (that is, when both electrode sheets and both separator sheets are wound around the core). ) Or when there is a defective portion in each of the two separator sheets.

  In the separator cutting step subsequent to the turret rotation step, the separator sheet extending from the core is cut by the separator cutting means. If the two separator sheets extend from the core, the two separator sheets are cut by the separator cutting means. If one separator sheet extends from the winding core, this one separator sheet is cut. This separator cutting process is similarly performed in the normal process and the removal process.

  As described above, according to the above-described means 4, the normal processing step and the removal processing step are excluding the point of the operation mode of both adsorption portions and the presence or absence of the step relating to the supply of both electrode sheets to the core. Common. That is, the processes executed on the turret and the core side are common in both processes. Accordingly, it is possible to prevent the operation modes such as the core and the turret from being greatly different in both steps. Thereby, simplification of an apparatus and suppression of increase in manufacturing cost can be further achieved.

Means 5. A rotation control means for controlling the rotation of the core;
The detection means is capable of detecting the position of a defective portion in the separator sheet for one element to be wound,
When the rotation control unit detects that the end of the defective part is downstream of the terminal part of the separator sheet for one element to be wound next by the detection unit, the defective part The winding device according to any one of means 1 to 4, wherein the rotation of the core is controlled so that the wire is wound until the end of the winding.

  According to the above means 5, for example, when a defective portion exists in the center of the separator sheet for one element, the winding core can wind up to the central part of the separator sheet for one element, It is possible to prevent the upstream separator sheet from being wound. Therefore, it is possible to effectively prevent the non-defective separator sheet from being removed (discarded) in vain. As a result, the yield can be further improved, and better productivity can be obtained.

Means 6. The detection means includes
In the transport path of the separator sheet upstream from the winding core, imaging means for imaging the separator sheet;
Imaging position specifying means for specifying the imaging position of the separator sheet by the imaging means,
Based on the state of the separator sheet itself in the imaging data obtained by the imaging means and the imaging position specified by the imaging position specifying means, the defect portion in the separator sheet for one element scheduled to be wound 6. The winding device according to any one of means 1 to 5, wherein presence or absence and position are detected.

  According to the means 6, the means (for example, a film or the like) is used to identify the defective part at the stage of conveying the separator sheet to the core, for example, at the stage of actually manufacturing the winding element. ), Based on the state of the separator sheet itself, the presence / absence and position of a defective portion in the separator sheet can be detected. Therefore, it is possible to more reliably detect the presence and position of a defective portion in the separator sheet, and thereby more reliably remove the defective portion in the separator sheet. Moreover, it can prevent more reliably that the separator sheet containing a defective part will be used for a winding element, and can aim at the quality improvement of a winding element.

It is a cross-sectional schematic diagram which shows the structure of a battery element. It is a schematic block diagram of a winding part. It is a schematic block diagram of a winding apparatus. It is a perspective schematic diagram of a separator raw fabric. It is a flowchart of a winding process. It is a block diagram which shows electric structures, such as a control apparatus. It is a flowchart of a normal processing process. It is a flowchart of a removal process process. It is a schematic block diagram of the winding part etc. when a winding process is started. It is a schematic block diagram of the winding part etc. at the time of winding the separator sheet with respect to a winding core. It is a schematic block diagram of the winding part etc. at the time of supplying a negative electrode sheet. It is a schematic block diagram of the winding part etc. at the time of supplying a positive electrode sheet. It is a schematic block diagram of the winding part etc. at the time of cut | disconnecting a positive electrode sheet. It is a schematic block diagram of the winding part etc. at the time of cut | disconnecting a negative electrode sheet. It is a schematic block diagram of the winding part etc. at the time of rotating a turret. It is a schematic block diagram of the winding part etc. at the time of hold | maintaining a separator sheet by both adsorption | suction parts. It is a schematic block diagram of the winding part etc. at the time of cut | disconnecting a separator sheet. It is a schematic block diagram of the winding part etc. at the time of winding up the termination | terminus part of a separator sheet. It is a schematic block diagram of a winding part etc. when a 1st adsorption | suction part operate | moves when one separator sheet has a defective part. FIG. 5 is a schematic configuration diagram of a winding part and the like when projecting a winding core or the like when one separator sheet has a defective part. When one separator sheet has a defective part, it is a schematic configuration diagram of a winding part and the like when the separator sheet is wound. It is a schematic block diagram of the winding part etc. at the time of rotating a turret when one separator sheet has a defective part. It is a schematic block diagram of a winding part etc. when a 2nd adsorption | suction part operate | moves in the case where there is a defective part in the other separator sheet. When the other separator sheet has a defective part, it is a schematic configuration diagram of a winding part and the like when projecting the core and the like. It is a schematic block diagram of the winding part etc. in the case of winding the said separator sheet etc. when there exists a defective part in the other separator sheet. It is a schematic block diagram of the winding part etc. at the time of rotating a turret when there is a defective part in the other separator sheet. It is a schematic block diagram of a winding part etc. at the time of holding a separator sheet by both adsorption parts, etc., when there is a defective part in at least one of both separator sheets. It is a schematic block diagram of the winding part etc. at the time of winding the separator sheet with a defect part. It is a perspective schematic diagram which shows the separator raw fabric and tab attached | subjected to this in another embodiment. It is a perspective schematic diagram which shows the separator original fabric and IC tag attached to this in another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. First, the configuration of a lithium ion battery element as a winding element obtained by the winding device will be described.

  As shown in FIG. 1, a lithium ion battery element 1 (hereinafter simply referred to as “battery element 1”) is formed by stacking a positive electrode sheet 4 and a negative electrode sheet 5 via two separator sheets 2 and 3. It is manufactured by being wound in a state. In FIG. 1, for convenience of explanation, separator sheets 2 and 3 and electrode sheets 4 and 5 (hereinafter, collectively referred to as “various sheets 2 to 5”) are shown with a space therebetween. .

  Separator sheets 2 and 3 are in the form of strips having the same width. In order to prevent different electrode sheets 4 and 5 from contacting each other and causing a short circuit, an insulator such as polypropylene (PP) is used. It is comprised by. Separator sheets 2 and 3 are relatively thin and soft.

  The electrode sheets 4 and 5 are made of thin metal sheets and have substantially the same width as the separator sheets 2 and 3. In the present embodiment, the negative electrode sheet 5 is longer than the positive electrode sheet 4 in order to reliably cover the positive electrode sheet 4 with the negative electrode sheet 5.

  Moreover, the active material is apply | coated to the front and back both surfaces of the electrode sheets 4 and 5. FIG. For example, an aluminum foil sheet is used as the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles) is applied to both the front and back surfaces. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon or the like) is applied to both the front and back surfaces. And ion exchange between the positive electrode sheet 4 and the negative electrode sheet 5 can be performed through the active material. More specifically, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5 side during charging, and ions move from the negative electrode sheet 5 side to the positive electrode sheet 4 side during discharging.

  A plurality of positive leads (not shown) extend from one edge of the positive electrode sheet 4 in the width direction, and a plurality of negative leads (not shown) extend from the other edge of the negative electrode sheet 5 in the width direction.

  When obtaining a lithium ion battery, the battery element 1 is disposed in a battery container (case) (not shown) that is made of metal and has a cylindrical shape, and the positive electrode lead and the negative electrode lead are combined. Then, the combined positive lead is connected to a positive terminal component (not shown), and the same negative lead is connected to a negative terminal component (not shown), and both terminal components are open at both ends of the battery container. The lithium ion battery can be obtained by being provided so as to be closed.

  Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 10 includes a winding unit 11 for winding the various sheets 2 to 5, and a positive electrode sheet supply mechanism 31 for supplying the positive electrode sheet 4 to the winding unit 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding unit 11, separator supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding unit 11, respectively, and a control device 81. Various mechanisms in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61 are configured to be controlled by a control device 81.

  The positive electrode sheet supply mechanism 31 includes a positive electrode sheet original fabric 32 in which the positive electrode sheet 4 is wound in a roll shape. The positive electrode sheet 32 is supported by a support shaft 33 that can be rotated by a driving means (not shown). With the rotation of the support shaft 33, the positive electrode sheet 4 is pulled out from the positive electrode sheet original fabric 32.

  The positive electrode sheet supply mechanism 31 includes a sheet insertion mechanism 71, a sheet cutting cutter 72, a tension applying mechanism 73, and a buffer mechanism 75.

  The sheet insertion mechanism 71 supplies the positive electrode sheet 4 to the winding unit 11, and approaches the winding unit 11 along the conveyance path of the positive electrode sheet 4, and is separated from the winding unit 11. It is configured to be movable between the separated positions. The sheet insertion mechanism 71 includes a pair of chucks 71 a and 71 b that can grip the positive electrode sheet 4. The chucks 71a and 71b are configured to be opened and closed by driving means (not shown). When the positive electrode sheet 4 is supplied to the winding unit 11, the sheet insertion mechanism 71 approaches the winding unit 11 after the positive electrode sheet 4 is gripped by the chucks 71 a and 71 b. ing.

  The sheet cutting cutter 72 is for cutting the positive electrode sheet 4 and includes a pair of blade portions 72 a and 72 b positioned on both the front and back sides of the positive electrode sheet 4. The sheet cutting cutter 72 is movable between a sheet cutting position where the pair of blade portions 72 a and 72 b sandwich the positive electrode sheet 4 and a retreat position where the positive electrode sheet 4 is retreated out of the conveyance path. It is configured.

  The positive electrode sheet 4 is cut while the positive electrode sheet 4 is held by the chucks 71a and 71b. Further, when the sheet insertion mechanism 71 moves closer to the winding unit 11 side to supply the positive electrode sheet 4 to the winding unit 11, the pair of blade parts 72 a and 72 b respectively transport the positive electrode sheet 4. By moving away from the path, the movement of the sheet insertion mechanism 71 is not hindered.

  The tension applying mechanism 73 includes a pair of rollers 73a and 73b and a dancer roller 73c provided so as to be swingable between the rollers 73a and 73b. The dancer roller 73c is operated by a predetermined servo motor (not shown) whose torque is controlled, and is configured such that the tension applied to the positive electrode sheet 4 can be changed by the control device 81 controlling the servo motor. ing. By applying tension to the positive electrode sheet 4, the positive electrode sheet 4 is prevented from slackening.

  The buffer mechanism 75 temporarily stores the positive electrode sheet 4 sent out from the positive electrode sheet raw fabric 32. The buffer mechanism 75 includes a pair of driven rollers 75a and 75b, and an elevating roller 75c that can be displaced in the vertical direction between the rollers 75a and 75b. The up-and-down roller 75 c is displaced in the vertical position based on the storage amount of the positive electrode sheet 4. Information regarding the vertical position of the lifting roller 75 c is input to the control device 81.

  The negative electrode sheet supply mechanism 41 includes a negative electrode sheet original fabric 42 in which the negative electrode sheet 5 is wound in a roll shape on the most upstream side. The negative electrode sheet fabric 42 is supported by a support shaft 43 that can be rotated by a driving means (not shown). As the support shaft 43 rotates, the negative electrode sheet 5 is pulled out from the negative electrode sheet original fabric 42.

  Similarly to the positive electrode sheet supply mechanism 31, the negative electrode sheet supply mechanism 41 includes a sheet insertion mechanism 71, a sheet cutting cutter 72, a tension applying mechanism 73, and a buffer mechanism 75. These are the same as those provided in the positive electrode sheet supply mechanism 31 except that the negative electrode sheet 5 functions. Therefore, detailed description thereof will be omitted.

  On the other hand, the separator supply mechanisms 51 and 61 include separator sheets 52 and 62 in which separator sheets 2 and 3 are wound in a roll shape, respectively. The separator original fabrics 52 and 62 are supported by support shafts 53 and 63 that can be rotated by a driving means (not shown). With the rotation of the support shafts 53 and 63, the separator sheets 2 and 3 are pulled out from the separator raw fabrics 52 and 62.

  In some cases, the separator sheets 2 and 3 constituting the separator raw fabrics 52 and 62 may have a defective portion such as a scratch. In this embodiment, as shown in FIG. 4, a defect identifying film 6 is affixed in advance to the defective portions of the separator sheets 2 and 3. The defect identifying film 6 is attached at a stage prior to the stage of obtaining the separator raw fabrics 52 and 62, such as a stage of manufacturing and inspecting the separator sheets 2 and 3, for example. The defect identifying film 6 is attached to one surface (for example, the front surface) of the front and back surfaces of the separator sheets 2 and 3.

  Further, the separator supply mechanisms 51 and 61 are provided with a tension applying mechanism 73 and a buffer mechanism 75 in the same manner as the electrode sheet supply mechanisms 31 and 41. These are the same as those provided in the positive electrode sheet supply mechanism 31 except that the separator sheets 2 and 3 function. Therefore, detailed description thereof will be omitted.

  In the present embodiment, the tension applying mechanism 73 of each of the supply mechanisms 31, 41, 51, 61 is configured to always apply a constant tension to the various sheets 2-5.

  Further, the separator supply mechanisms 51 and 61 include guide rollers 76 in the middle of the transport path of the separator sheets 2 and 3 and upstream of the buffer mechanism 75. The guide roller 76 is in a state where the separator sheets 2 and 3 are suspended, and rotates as the separator sheets 2 and 3 are conveyed.

  In addition, the rotation amount of the guide roller 76 can be grasped by a roller encoder 76a (see FIG. 6) provided corresponding to the guide roller 76. Information about the rotation amount of the guide roller 76 is input to the control device 81 from the roller encoder 76a. The rotation amount of the guide roller 76 corresponds to the feed amount of the separator sheets 2 and 3.

  In addition, a camera 77 as an imaging unit is provided in the middle of the transport path of the separator sheets 2 and 3 and upstream of the guide roller 76. The surface of the separator sheets 2 and 3 on which the defect identifying film 6 is attached is imaged by the camera 77. Then, the imaging data obtained by the camera 77 is input to the control device 81. In addition, the imaging part by the camera 77 is illuminated by predetermined illumination.

  Further, a pair of nip rollers 78 a and 78 b are provided in the middle of the conveyance path of the various sheets 2 to 5 and immediately upstream of the winding unit 11. Various sheets 2 to 5 are conveyed to the winding unit 11 along the same conveyance path by the nip rollers 78a and 78b.

  Further, the nip rollers 78a and 78b are configured to be movable between a closed position and an open position by driving means (not shown). In a state where the nip rollers 78a and 78b are respectively disposed at the closed positions, the various sheets 2 to 5 are sandwiched between them. The nip rollers 78a and 78b are usually arranged in a closed position.

  On the other hand, when at least one of the nip rollers 78a and 78b is disposed at the open position, the nip rollers 78a and 78b are slightly separated from each other. In this state, when the separator sheets 2 and 3 are disposed between the nip rollers 78a and 78b, the separator sheets 2 and 3 are slightly separated and do not interfere with each other.

  Next, the structure of the winding part 11 is demonstrated. As shown in FIG. 2, the winding part 11 is provided at intervals of 180 ° in the rotation direction of the turret 12 and the turret 12 composed of two opposing disk-shaped tables that can be rotated by a driving means (not shown). The two cores 13 and 14, the first suction part 15a and the second suction part 15b, the separator cutter 16 as the separator cutting means, and the various sheets 2 to 5 after winding are prevented from being scattered. A pressing roller 17 and a tape applying mechanism 18 for applying a predetermined fixing tape are provided.

  The winding cores 13 and 14 are for winding the various sheets 2 to 5 on the outer peripheral side of the winding cores 13 and 14, respectively, and are configured to be rotatable about their own central axes by a driving means (not shown). The amount of rotation of the cores 13 and 14 can be detected by a predetermined core encoder 19 (see FIG. 6), and information about the amount of rotation of the cores 13 and 14 from the core encoder 19 is controlled by the control device. 81 is input.

  Further, the winding cores 13 and 14 are movable along their own rotation axis direction (the depth direction in FIG. 2 and the like), and are provided so as to be able to appear and retract with respect to one table constituting the turret 12. When the cores 13 and 14 protrude from the one table, the leading ends thereof are inserted into receiving holes formed in the other table, and are supported in a rotatable state by both tables. It has become so.

  Furthermore, the winding core 13 (14) includes a pair of core pieces 13a and 13b (14a and 14b) extending along its own axial direction (the depth direction in FIG. 2). A slit 13c (14c) is formed between the core pieces 13a and 13b (14a and 14b). The slits 13c and 14c have a shape that extends straight so as to pass through the rotation axes of the cores 13 and 14.

  Further, the winding cores 13 and 14 are configured to be capable of turning between a winding position P1 as a first position and a removal position P2 as a second position by the rotation of the turret 12. When the cores 13 and 14 move from the removal position P2 to the winding position P1, the cores 13 and 14 move in a state of being immersed in the turret 12 (one table).

  The winding position P1 is a position where the various sheets 2 to 5 are wound by the winding cores 13 and 14. Various sheets 2 to 5 are supplied from the supply mechanisms 31, 41, 51 and 61 to the winding position P1.

  The removal position P <b> 2 is basically a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. In the removal position P2, the defective roll 7 (see FIG. 28) in which at least one of the separator sheets 2 and 3 is wound may be removed. At the periphery of the removal position P2, a removal device (not shown) for removing the battery element 1 and the defective roll 7 from the cores 13 and 14 is provided.

  The first adsorbing portion 15a and the second adsorbing portion 15b hold the separator sheets 2 and 3 between the winding position P1 and the removal position P2 or adsorb the separator sheets 2 and 3, It is for moving individually.

  Suction holes (not shown) for adsorbing the separator sheets 2 and 3 are formed at the front ends of the adsorbing portions 15a and 15b. Each suction hole is configured such that a negative pressure can be supplied from a predetermined vacuum pump (not shown). The first suction portion 15a can suck the separator sheet 3 in a state where negative pressure is supplied to the suction holes. On the other hand, the second adsorbing portion 15b can adsorb the separator sheet 2 in a state in which a negative pressure is supplied to the suction hole.

  Further, the first suction portion 15a and the second suction portion 15b are parallel to the rotation shafts of the turret 12 and the winding cores 13 and 14 by driving means (not shown), and the separator sheets 2 and 3 on the nip rollers 78a and 78b side. It is configured to be able to turn around a rotation axis that passes through the conveyance path. And both adsorption | suction part 15a, 15b can be moved between the clamping position and the retracted position, respectively.

  When the both suction portions 15a and 15b are arranged at the holding positions, respectively, the separator sheets 2 and 3 arranged from the nip rollers 78a and 78b to the removal position P2 can be held by the both suction portions 15a and 15b. (See FIG. 16). In this state, if the nip rollers 78a and 78b are disposed at the closed positions, the separator sheets 2 and 3 pass through the rotation shafts of the winding cores 13 and 14 disposed at the winding position P1. Therefore, by adjusting the direction of the slits 13c and 14c, the slits 13c and 14c of the cores 13 and 14 that are disposed at the winding position P1 and sunk with respect to the turret 12 and the separator sheets 2 and 3 are wound. It is possible to overlap the cores 13 and 14 along the rotation axis direction.

  Further, when the first adsorbing portion 15a that adsorbs the separator sheet 3 is disposed at the holding position and the nip roller 78a is disposed at the closed position, only the separator sheet 3 is wound at the winding position P1. It is possible to overlap the slits 13c and 14c of the cores 13 and 14. Furthermore, if the second adsorbing portion 15b that adsorbs the separator sheet 2 is placed in the clamping position and the nip roller 78b is placed in the closed position, only the separator sheet 2 is wound at the winding position P1. It is possible to overlap the slits 13c and 14c of the cores 13 and 14.

  On the other hand, when both the adsorbing portions 15a and 15b are disposed at the retracted positions while adsorbing the separator sheets 2 and 3, respectively, the separator sheet 2 is positioned away from the cores 13 and 14 disposed at the winding position P1. , 3 are arranged. Specifically, when the first adsorbing portion 15a that adsorbs the separator sheet 3 is disposed at the retracted position, the separator sheet 3 is disposed above the cores 13 and 14 disposed at the winding position P1. (See FIG. 19). On the other hand, when the second adsorbing portion 15b that adsorbs the separator sheet 2 is disposed at the retracted position, the separator sheet 2 is disposed below the cores 13 and 14 disposed at the winding position P1 (FIG. 23). reference).

  In the present embodiment, the first suction portion 15a moves inside the movement path of the cores 13 and 14 accompanying the rotation of the turret 12. For this reason, it is possible to prevent an increase in the size of the mechanism for moving the first suction portion 15a, and it is possible to simplify the apparatus. However, with this configuration, as a result, the separator sheet 3 adsorbed by the first adsorbing portion 15a exists on the moving path of the cores 13 and 14 from the winding position P1 to the removal position P2. Become. However, in the present embodiment, the winding cores 13 and 14 are moved from the winding position P1 to the removal position P2 while being immersed in the turret 12, and therefore the movement of the winding cores 13 and 14 is inhibited by the separator sheet 3. There is no.

  On the other hand, the second adsorption portion 15b moves between the inside of the movement path of the cores 13 and 14 and the outside of the movement path. The second suction portion 15b moves to the outside of the movement path of the cores 13 and 14 when arranged at the retracted position. Therefore, by arranging the second adsorbing portion 15b that adsorbs the separator sheet 2 at the retracted position, the separator sheet 2 is retracted to a position that is removed from the moving path of the cores 13 and 14 with respect to the removal position P2 from the winding position P1. It is possible. When the cores 13 and 14 are moved from the winding position P1 to the removal position P2, at least one of the separator sheets 2 and 3 is wound around the outer periphery thereof. It cannot be moved in the sunken state.

  The separator cutter 16 is disposed between the winding position P1 and the removal position P2, and is provided closer to the removal position P2 than the both suction portions 15a and 15b. The separator cutter 16 can reciprocate in a vertical direction between a predetermined upper position and a lower position, and cuts the separator sheets 2 and 3 by moving from the upper position to the lower position.

  The presser roller 17 is disposed in the vicinity of the removal position P2, and is located near the turret 12 and presses the various sheets 2 to 5; It is configured to be movable between.

  The tape sticking mechanism 18 is disposed in the vicinity of the removal position P2, approaches the turret 12 at the end of winding, and sticks the fixing tape to the end portions of the separator sheets 2 and 3. By sticking the fixing tape, the battery element 1 is wound.

  Next, the control device 81 will be described. The control device 81 includes a CPU as a calculation means, a ROM that stores various programs, a RAM that temporarily stores various data such as calculation data and input / output data, and a hard disk that stores calculation data and the like for a long time. . As described above, the control device 81 controls the operation of the winding unit 11 and the supply mechanisms 31, 41, 51, 61. For example, the control device 81 controls the support shafts 33, 43, 53, 63 based on the input vertical position of the raising / lowering roller 75 c, whereby various sheets 2 having a predetermined length or more with respect to the buffer mechanism 75. Maintain a state where ˜5 is stored.

  In addition, the control device 81 has a length (hereinafter, referred to as “the length of one battery element” plus a predetermined minimum windingable length immediately before the start of a winding process described later). The separator sheets 2 and 3 are sent out so that the separator sheets 2 and 3 (referred to as “(1 + α) element length”) are positioned in the transport path of the separator sheets 2 and 3 downstream from the camera 77. Immediately before the start of the winding process, the both end portions 15a, 15b are in a state where the start end portions of the separator sheets 2, 3 to be wound next are sandwiched (see FIG. 9).

  The minimum winding length is the minimum length necessary for winding the separator sheets 2 and 3 by the cores 13 and 14, and is smaller than the length of the separator sheets 2 and 3 for one element. Is. The minimum winding length is the length of the separator sheets 2 and 3 required for winding around the cores 13 and 14 in the winding process described later, and the winding of the separator sheets 2 and 3 remaining after the separator cutting process described later. It is derived based on the length of the remaining part.

  As illustrated in FIG. 6, the control device 81 includes a feed amount specifying unit 82, an imaging timing control unit 83, a defect information acquisition unit 84, a storage device 85, and an operation control unit 86. In the present embodiment, the camera 77 and the defect information acquisition unit 84 constitute a detection unit 87 as detection means. In the present embodiment, the sheet insertion mechanism 71, the first suction unit 15a, the second suction unit 15b, and the operation control unit 86 constitute a supply control unit 88 as a supply control unit.

  The feed amount specifying unit 82 acquires the feed amounts of the separator sheets 2 and 3 based on the information regarding the rotation amount of the guide roller 76 input from the roller encoder 76a.

  The imaging timing control unit 83 controls the timing of imaging with the camera 77. The timing of imaging is controlled based on the feed amounts of the separator sheets 2 and 3 acquired by the feed amount specifying unit 82, and every time the separator sheets 2 and 3 are fed by a predetermined amount, the camera 77 captures the separator sheets 2 and 3. Is done. In the present embodiment, immediately before the start of the winding process, the separator sheets 2 and 3 having a length of at least (1 + α) elements located downstream of the camera 77 are imaged.

  The defect information acquisition unit 84 includes an imaging position specifying unit 84a as an imaging position specifying unit and a defect presence / absence detecting unit 84b.

  The imaging position specifying unit 84 a specifies the imaging position of the camera 77 based on the feed amounts of the separator sheets 2 and 3 acquired by the feed amount specifying unit 82. That is, it is specified which part of the separator sheets 2 and 3 the imaging data relates to.

  The defect presence / absence detection unit 84b detects the presence / absence of a defect portion in the separator sheets 2 and 3 based on the imaging data obtained by the camera 77. In the present embodiment, the defect presence / absence detection unit 84b detects the presence / absence of the separator sheets 2 and 3 based on the presence / absence of the defect identifying film 6 in the imaging data.

  Further, the defect presence / absence detection unit 84b also detects the presence position of the defect portion. Specifically, when the defect presence / absence detection unit 84b detects the starting edge of the defect identifying film 6 from the image data, the defect presence / absence detecting section 84b identifies the starting edge as the beginning of the defect portion. Then, until the end of the defect identifying film 6 is detected from the imaging data, the defect presence / absence detection unit 84b determines that the portion upstream of the starting end in the separator sheets 2 and 3 is a defective portion. When the end of the defect identifying film 6 is detected from the imaging data, the defect presence / absence detection unit 84b specifies this end as the end of the defective portion. As a result, the defect presence / absence detection unit 84b detects the position from the beginning to the end of the defect identifying film 6 as the position where the defect portion exists.

  The defect identification film 6 is detected by, for example, binarizing the imaging data, and using the preset reference value for the brightness from the binarized imaging data, for defect identification. This can be done by specifying the film 6.

  Further, the defect information acquisition unit 84 is based on the information on the imaging position obtained by the camera 77 obtained by the imaging position specifying unit 84a and the information on the presence / absence of the defect portion and the existence position obtained by the defect presence / absence detection unit 84b. The information regarding the presence and position of the defective portion in the separator sheets 2 and 3 is acquired. In the present embodiment, the defect information acquisition unit 84 includes the presence / absence of a defect portion in the separator sheets 2 and 3 having a length of at least (1 + α) elements located downstream from the camera 77 and before the start of the winding process. Information on the position is acquired in advance.

  The storage device 85 is constituted by the hard disk or the like, for example, and stores information on the presence / absence and position of the defect portion acquired by the defect information acquisition unit 84.

  The operation control unit 86 controls the mechanism related to the supply of the various sheets 2 to 5 to the cores 13 and 14 and the rotation of the cores 13 and 14. The operation control unit 86 includes a rotation control unit 86a, an electrode supply control unit 86b, and a separator supply control unit 86c as rotation control means.

  The rotation control unit 86a controls the amount of rotation of the cores 13 and 14 in the winding process based on the information regarding the presence and position of the defective portion stored in the storage device 85.

  Specifically, when there is no defect in the separator sheets 2 and 3 for one element to be wound next, the rotation control unit 86a uses the cores 13 and 14 to separate the separator sheet for one element. The amount of rotation of the cores 13 and 14 is controlled so that the second and third end portions are wound. The amount of rotation of the cores 13 and 14 is obtained from information from the core encoder 19.

  On the other hand, when a defective portion exists in the separator sheets 2 and 3 for one element to be wound next, the rotation control unit 86a determines whether the winding cores 13 and 14 are based on the position of the end of the defective portion. Control the amount of rotation.

  More specifically, when the end of the defective portion is located in the separator sheets 2 and 3 for one element, the rotation control unit 86a causes the winding cores 13 and 14 to be wound up to the end of the defective portion. Control the amount of rotation. By this control, in the winding process, up to the middle of the separator sheets 2 and 3 for one element is wound.

  On the other hand, when the end of the defective portion is located in the separator sheets 2 and 3 having the same length as the minimum winding length continuous to the separator sheets 2 and 3 for one element, the rotation control unit 86a The amount of rotation of the cores 13 and 14 is controlled so that the end of the defective portion is wound.

  When the end of the defective portion is not positioned in the separator sheets 2 and 3 having a length of (1 + α) elements, the rotation control unit 86a winds up to the terminal portions of the separator sheets 2 and 3 for one element. Thus, the amount of rotation of the winding cores 13 and 14 is controlled.

  The electrode supply control unit 86b switches the supply / non-supply of the electrode sheets 4 and 5 to the cores 13 and 14 by controlling the operation of the sheet insertion mechanism 71.

  Specifically, when there is no defective portion in the separator sheets 2 and 3 for one element to be wound next, the electrode supply control unit 86b applies both electrode sheets to the cores 13 and 14. The sheet insertion mechanism 71 is controlled so that 4 and 5 are supplied. On the other hand, when there is a defective portion in the separator sheets 2 and 3 for one element to be wound next, the electrode supply control unit 86b does not supply both the electrode sheets 4 and 5 to the sheet insertion mechanism. 71 is controlled.

  The separator supply control unit 86c switches the supply / non-supply of the separator sheets 2 and 3 to the cores 13 and 14 by controlling the operations of the first adsorption unit 15a and the second adsorption unit 15b.

  Specifically, when there is no defective portion in the separator sheets 2 and 3 for one element to be wound next, the separator supply control unit 86c performs both adsorption units 15a in the separator arranging step described later. , 15b are kept at the clamping positions, and the separator sheets 2 and 3 are clamped by both suction portions 15a, 15b. As a result, both separator sheets 2 and 3 are supplied to the cores 13 and 14. When there is a defective portion in each of the separator sheets 2 and 3 for one element to be wound next, the separator supply control unit 86c performs the same operation as described above.

  On the other hand, when there is a defective part only in one of the separator sheets 2 and 3 for one element to be wound next, the separator supply control unit 86c has a defective part in the separator arranging step. The suction portions 15a and 15b that suck the separator sheets 2 and 3 on the side to be moved are moved to the retracted position. On the other hand, the separator supply control unit 86c maintains the adsorbing units 15a and 15b adsorbing the separator sheets 2 and 3 on the side where no defect exists, in a state where the adsorbing units 15a and 15b are arranged at the nipping positions. As a result, as a result, only the separator sheets 2 and 3 having the defective portion are supplied to the cores 13 and 14.

  Next, the winding process of the various sheets 2-5 by said winding apparatus 10 is demonstrated.

  Prior to the winding step, one core 13 (14) disposed at the winding position P1 is in a state of being immersed in one table constituting the turret 12. In addition, before the start of the winding process, the separator sheets 2 and 3 are held by the both suction portions 15a and 15b arranged at the holding position, so that the separator sheets 2 and 3 are held. . Further, the nip rollers 78a and 78b are in a state of being disposed at the closed positions, respectively. In addition, the slit 13c (14c) of the one core 13 (14) disposed at the winding position P1 is formed along the rotation axis direction of the one core 13 (14) with the nip rollers 78a and 78b and both suctions. The separator sheets 2 and 3 located between the portions 15a and 15b overlap each other (see FIG. 9 respectively). In FIG. 9 etc., the winding cores 13 and 14 in a state of being sunk with respect to the table of the turret 12 are indicated by dotted lines.

  In the winding process, as shown in FIG. 5, first, in step S11, based on the information obtained by the defect information acquisition unit 84, the separator sheets 2 and 3 for one element scheduled to be wound next. It is determined whether or not there is a defective portion.

  If a negative determination is made in step S11, the process proceeds to step S12, the normal processing step is executed, and the winding step is terminated. On the other hand, when an affirmative determination is made in step S11, the process proceeds to step S13, the removal process step is executed, and the winding step is terminated.

  First, the normal processing process will be described. In the normal processing step, as shown in FIG. 7, a separator placement step is executed in step S21. In the separator arrangement step, both the adsorbing portions 15a and 15b are maintained in the state of being arranged at the clamping positions. Thereby, the slit 13c (14c) of one winding core 13 (14) and both separator sheets 2 and 3 arrange | positioned in the winding position P1 along the rotating shaft direction of one winding core 13 (14). The overlapping state is maintained (see FIG. 9).

  Subsequently, in step S22, a separator insertion process is executed. In the separator insertion process, one of the cores 13 (14) protrudes from one table constituting the turret 12 so that the separator sheets 2 and 3 are placed against the slits 13c (14c) of the core 13 (14). Insert. Thereby, both separator sheets 2 and 3 are supplied to one core 13 (14).

  Next, in step S23, a winding process is executed. In the winding process, one core 13 (14) is rotated by a predetermined number so that the separator sheets 2 and 3 are wound and fixed by a predetermined amount around the one core 13 (14). Then, at the stage where a predetermined amount of separator sheets 2 and 3 are wound around one of the cores 13 (14), both the adsorbing portions 15a and 15b are moved to the retracted positions (see FIG. 10).

  In a succeeding step S24, an electrode sheet supply process is executed. In the electrode sheet supply step, first, the negative electrode sheet 5 is supplied to the one core 13 (14) side by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41. Specifically, the sheet insertion mechanism 71 that holds the negative electrode sheet 5 is moved closer to the winding unit 11 side, and the negative electrode sheet 5 is inserted between the separator sheets 2 and 3, whereby one core 13 (14 ) To the negative electrode sheet 5 (see FIG. 11). Note that after the negative electrode sheet 5 is supplied, the holding of the negative electrode sheet 5 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  In addition, after supplying the negative electrode sheet 5, when one core 13 (14) is rotated by a predetermined number (for example, one rotation), the sheet insertion mechanism 71 moves the core 13 (14) toward the one core 13 (14) side. The positive electrode sheet 4 is supplied. Specifically, the positive electrode sheet 4 is supplied by inserting the positive electrode sheet 4 between the separator sheets 2 and 3 by bringing the sheet insertion mechanism 71 that holds the positive electrode sheet 4 closer to the winding part 11 side. (See FIG. 12). Note that after the positive electrode sheet 4 is supplied, the gripping of the positive electrode sheet 4 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  In the winding process of subsequent step S25, the one supplied to one core 13 (14) of the various sheets 2 to 5 is wound by the rotation of one core 13 (14). In the normal processing step, since both separator sheets 2 and 3 and both electrode sheets 4 and 5 are supplied to one core 13 (14), both separator sheets 2 and 3 and both electrode sheets 4 and 5 are wound. Is done.

  Next, in step S26, an electrode sheet cutting step is executed. In the electrode sheet cutting step, the rotation of the one core 13 (14) is temporarily stopped when the rotation amount of the one core 13 (14) reaches a predetermined amount. Then, in a state where the positive electrode sheet 4 is held by the sheet insertion mechanism 71, the positive electrode sheet 4 is cut by the sheet cutting cutter 72 (see FIG. 13).

  Thereafter, the rotation of the one core 13 (14) is resumed, and when the rotation amount of the one core 13 (14) reaches a predetermined amount, the rotation of the one core 13 (14) is temporarily stopped again. To do. Then, in a state where the negative electrode sheet 5 is gripped by the sheet insertion mechanism 71, the negative electrode sheet 5 is cut by the sheet cutting cutter 72 (see FIG. 14).

  And the termination | terminus part (unwinding part) of the electrode sheets 4 and 5 is wound up by restarting rotation of one winding core 13 (14). In addition, after the turret 12 is rotated in the turret rotation process described below, the terminal portions of the separator sheets 2 and 3 for one element reach a position corresponding to the separator cutter 16 between the positions P1 and P2. The amount of rotation of one core 13 (14) in the winding process or the like is adjusted.

  In step S27, a turret rotation process is executed. In the turret rotation process, the turret 12 is rotated without cutting the separator sheets 2 and 3. As a result, one core 13 (14) at the winding position P1 moves to the removal position P2 side while pulling out the separator sheets 2 and 3 from the separator supply mechanisms 51 and 61. On the other hand, the other core 14 (13) at the removal position P2 moves toward the winding position P1 (see FIG. 15). The other winding core 14 (13) moves while being immersed in one table of the turret 12.

  After the turret 12 is rotated, the end portions of the separator sheets 2 and 3 for one element reach a position corresponding to the separator cutter 16 between the positions P1 and P2. In this state, one core 13 (14) is in a stopped state.

  In the next step S28, a separator cutting process is executed. In the separator cutting step, both the adsorbing portions 15a and 15b are moved to the holding positions, and the both separator sheets 2 and 3 are held by the both adsorbing portions 15a and 15b (see FIG. 16).

  Next, the separator cutter 16 is moved from the upper position to the lower position. Thereby, the separator sheets 2 and 3 extended from one core 13 (14) are cut | disconnected in the terminal part of the separator sheets 2 and 3 for one element (refer FIG. 17). As a result, the separator sheets 2 and 3 wound around one core 13 (14) and the separator sheets 2 and 3 upstream of this are separated.

  Finally, a winding end process is executed in step S29, and the normal processing process is terminated. In the winding end process, the one core 13 (14) is rotated while the sheet wound around the one core 13, 14 is being pressed by the pressing roller 17 (see FIG. 18). Thus, the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are completely wound up without being scattered.

  Thereafter, the end portion of the separator sheets 2 and 3 is fastened by the tape applying mechanism 18 with the fixing tape, thereby completing the winding end process. The battery element 1 that has been wound is removed from the one core 13 (14) by the removing device.

  Next, the removal process step will be described. In the removal processing step, as shown in FIG. 8, in step S31, the separator placement step is executed. In the separator disposing step of the removal processing step, the separator sheets 2 and 3 are adsorbed by the adsorbing portions 15a and 15b, and the separator sheet 2 and 3 having a defective portion is disposed on one of the cores along the rotation axis direction. 13 (14) is disposed at a position overlapping with the slit 13c (14c), while the separator sheets 2 and 3 having no defective portion are disposed at positions away from the one core 13 (14) along the rotation axis direction. Both adsorption | suction parts 15a and 15b are operated so that it may do.

  Specifically, when a defective portion exists only in the separator sheet 2, the separator sheet 3 is moved to one retraction position by moving the first suction portion 15 a that sucks the good separator sheet 3 to the retracted position. It arrange | positions in the position remove | deviated from (14). On the other hand, the 2nd adsorption | suction part 15b which adsorb | sucks the separator sheet 2 is maintained in the state arrange | positioned in the clamping position. Thereby, only the separator sheet 2 with a defective part is arrange | positioned in the position which overlaps with the slit 13c (14c) of one core 13 (14) (refer FIG. 19).

  In addition, when a defective portion exists only in the separator sheet 3, the non-defective separator sheet 2 is moved to the retracted position by moving the second adsorbing portion 15 b that adsorbs the non-defective separator sheet 2 to one core 13 ( 14) Place at a position deviating from the above. On the other hand, the 1st adsorption | suction part 15a which adsorb | sucks the separator sheet 3 is maintained in the state arrange | positioned in the clamping position. Thereby, only the separator sheet 3 with a defective part is arrange | positioned in the position which overlaps with the slit 13c (14c) of one core 13 (14) (refer FIG. 23). 19 to 22 are schematic configuration diagrams for explaining the operation of the winding device 10 when a defective portion exists only in the separator sheet 2. 23 to 26 are schematic configuration diagrams for explaining the operation of the winding device 10 when a defective portion exists only in the separator sheet 3.

  If there is a defective portion in each of the separator sheets 2 and 3, the separator sheets 2 and 3 are wound on one winding by maintaining the suction portions 15a and 15b in the sandwiched positions. It arrange | positions in the position which overlaps with the slit 13c (14c) of the core 13 (14).

  Next, in the separator insertion process of step S <b> 32, one winding core 13 (14) is protruded from one table of the turret 12. This step is the same as the separator insertion step in the normal processing step. As a result, the separator sheets 2 and 3 arranged at positions overlapping with the slits 13c (14c) of one of the cores 13 (14) are inserted into the slits 13c (14c), and the separator sheets 2 and 3 having a defective portion are inserted. It supplies to one core 13 (14) (refer FIG. 20, 24).

  Further, after the separator sheets 2 and 3 are inserted into the slits 13c (14c), the nip rollers 78a and 78b are moved. More specifically, only the nip rollers 78a and 78b on which the separator sheets 2 and 3 on the side not supplied to one core 13 (14) are suspended are moved to the open position, and the other nip rollers 78a and 78b are closed. Keep it in place. Thereby, separator sheet 2 and 3 can be spaced apart and it can prevent that both interfere with each other. Moreover, since the conveyance path | route of the separator sheets 2 and 3 when supplying to one core 13 (14) can always be made constant, the improvement of the precision and stability of operation | movement in the winding apparatus 10 can be improved. It can be planned.

  In addition, when both the separator sheets 2 and 3 have a defect part, one core 13 (14) protrudes from the turret 12, and both the separator sheets 2 and 3 become one core 13 (14). Supplied to. Further, the nip rollers 78a and 78b are each maintained in a state of being disposed at the closed position.

  In the subsequent winding step of step S33, the separator sheets 2 and 3 supplied to the core 13 (14) are wound around the core 13 (14) by rotating the core 13 (14) by a predetermined number. Fix it. This step is the same as the winding step in the normal processing step.

  Then, at the stage where the separator sheets 2 and 3 supplied to the core 13 (14) are wound around the one core 13 (14), a negative pressure is applied to the suction holes of the suction portions 15a and 15b that adsorb the separator sheets 2 and 3. Stop supplying. Then, the suction portions 15a and 15b that have released the suction of the separator sheet 2 are moved to the retracted position (see FIGS. 21 and 25). In the normal processing step and the removal processing step, the timing of moving the suction portions 15a and 15b to the retracted position is different, but the point that the suction portions 15a and 15b are disposed to the retracted position after the winding step is the same.

  After the winding process, the winding process of step S35 is performed without performing the electrode sheet supply process that was performed in the normal processing process. Therefore, in the removal process, both electrode sheets 4 and 5 are not supplied to one core 13 (14) after the winding process and before the winding process.

  In the winding step of step S35, the one supplied to one core 13 (14) of the separator sheets 2 and 3 is wound by the rotation of one core 13 (14). In the winding process, after the turret 12 is rotated in the turret rotation process described below, the planned cutting site of the separator sheets 2 and 3 reaches a position corresponding to the separator cutter 16 between the positions P1 and P2. The winding amount of the separator sheets 2 and 3 is adjusted.

  Note that the scheduled cutting position varies depending on the end position of the defective portion. In the case where only one separator sheet 2 or 3 has a defective portion, (1 + α) of the separator sheets 2 and 3 having a length corresponding to the element (separator sheets 2 and 3 in which the presence or absence of the defective portion has already been detected) If the end of the defective portion is located in the region, the planned cutting site is the end of the defective portion. For example, if the end of the defective portion is located in the separator sheets 2 and 3 for one element, the planned cutting site is a part in the middle of the separator sheets 2 and 3 for one element. In addition, if the end of the defective portion is located in the separator sheet 2 or 3 having the minimum winding length continuous to the separator sheet 2 or 3 for one element, the minimum winding can be performed at the planned cutting site. In the middle of the separator sheets 2 and 3 having a length.

  On the other hand, in the case where a defect portion exists only in one separator sheet 2 or 3, when the end of the defect portion is not located in the separator sheet 2 or 3 having a length of (1 + α) elements, cutting is performed. The planned position is the terminal portion of the separator sheets 2 and 3 for one element.

  Furthermore, when a defect portion exists in both separator sheets 2 and 3, the planned cutting site is the next site in the separator sheets 2 and 3. That is, in both separator sheets 2 and 3, if the end of the defective portion is located in the separator sheets 2 and 3 having a length of (1 + α) elements, the end of the two defective portions located upstream Is the site to be cut. On the other hand, in at least one of the separator sheets 2 and 3, when the end of the defective portion is not located in the separator sheet 2 or 3 having a length of (1 + α) elements, the scheduled cutting position is one element. The end portions of the separator sheets 2 and 3 are used.

  Although it is conceivable that the scheduled cutting position is always the end of the defective portion, in this case, the winding amount of the separator sheets 2 and 3 by the winding cores 13 and 14 is the maximum of the separator sheets 2 and 3 that can be wound. There is a possibility of exceeding a large amount, which is not realistic.

  Further, in this embodiment, when the end of the defective portion is located in the separator sheet 2 or 3 having the minimum rewound length continuous to the separator sheet 2 or 3 for one element, the scheduled cutting position is set to one. The reason why the defective portion is not the end portion of the separator sheets 2 and 3 for the element is as follows. That is, assuming that the terminal portion of the separator sheets 2 and 3 for one element is a planned cutting portion, after the separator cutting step, the separator sheet 2 and 3 scheduled to be wound next to the end of the defective portion. The length is shorter than the minimum winding length. Therefore, in the next winding process, it is not possible to wind only the defective portion, and it is necessary to wind up the non-defective separator sheets 2 and 3 upstream to some extent. Therefore, in the obtained defective roll 7, the good separator sheets 2 and 3 are included to some extent, and the material becomes untitled. In the present embodiment, in order to eliminate such waste of material, the planned cutting site is defined as described above.

  After the winding process, the turret rotation process of step S37 is executed. In the normal processing step, an electrode sheet cutting step for cutting the electrode sheets 4 and 5 is executed before the turret rotation step. In the removal processing step, the electrode sheets 4 and 5 are applied to one core 13 (14). Is not supplied, the electrode sheet cutting step is unnecessary.

  In the turret rotation process of step S37, the turret 12 is rotated as in the normal processing process. Thereby, one core 13 (14) in the winding position P1 moves toward the removal position P2 while pulling out at least one separator sheet 2 and 3 from the separator supply mechanisms 51 and 61 (FIG. 22 and 26).

  Then, after the turret 12 is rotated, the part to be cut of the separator sheets 2 and 3 reaches a position corresponding to the separator cutter 16 between the positions P1 and P2. In this state, one core 13 (14) is in a stopped state.

  Next, in the separator cutting process of step S38, both the suction portions 15a and 15b are arranged at the clamping positions as in the normal processing process (see FIG. 27). Thus, when only one separator sheet 2 or 3 is wound, the other separator sheet 2 or 3 that has been retracted is moved to the one separator sheet 2 or 3 side. And both the separator sheets 2 and 3 will be in the state clamped by both adsorption | suction part 15a, 15b. Also, when both separator sheets 2 and 3 are wound, both separator sheets 2 and 3 are sandwiched by both adsorption portions 15a and 15b.

  Further, of the nip rollers 78a and 78b, the one arranged at the open position is moved to the closed position.

  Next, by moving the separator cutter 16 from the upper position to the lower position, the separator sheets 2 and 3 extending from one of the cores 13 (14) are cut at the planned cutting site. Thereby, the separator sheets 2 and 3 including the defective portion wound around one of the cores 13 (14) and the separator sheets 2 and 3 upstream from this are separated.

  Since the movement path of the separator cutter 16 is constant, when only one of the separator sheets 2 and 3 is cut, the cut parts of the separator sheets 2 and 3 are separated from the separator sheets 2 and 3 on the uncut side. It will be in the state where it overlapped with the edge of. That is, a state similar to that when both separator sheets 2 and 3 are cut at once by the separator cutter 16 is obtained. Therefore, even if it is a normal processing process or a removal processing process, after the separator cutting process, the start ends of both separator sheets 2 and 3 scheduled to be wound next overlap each other.

  In the subsequent step S39, the winding end process is executed, and the removal process step is completed. In the end-of-winding process, the one core 13 (14) is rotated while the sheet wound around one of the cores 13 and 14 is pressed by the pressing roller 17 as in the normal processing step. Thereby, the termination | terminus part of the separator sheets 2 and 3 extended from one winding core 13 (14) is wound up. As a result, a defective roll 7 in which separator sheets 2 and 3 including a defective portion are wound is obtained (see FIG. 28). Then, removal of the defective part in the separator sheets 2 and 3 is completed by removing the defective roll 7 from one core 13 (14) with the said removal apparatus. Note that the fixing tape may or may not be applied to the defective roll 7.

  As described above in detail, according to the present embodiment, the defective portions of the separator sheets 2 and 3 can be easily removed using the cores 13 and 14 that are indispensable for manufacturing the battery element 1. Therefore, it is possible to effectively simplify the winding device 10 and suppress an increase in manufacturing cost.

  Moreover, only the side where the defective part exists among both separator sheets 2 and 3 is supplied to the cores 13 and 14. Therefore, it is possible to more reliably prevent the non-defective separator sheets 2 and 3 from being wasted (discarded). As a result, yield can be improved and productivity can be increased.

  Further, the separator sheets 2 and 3 can be selectively supplied to the cores 13 and 14 with a relatively simple configuration using both the adsorbing portions 15a and 15b. Thereby, simplification of the winding apparatus 10 and increase suppression of manufacturing cost can be aimed at more effectively. Further, in a mechanism such as the sheet insertion mechanism 71 that grips the sheet and supplies it to the cores 13 and 14, it is difficult to supply the thin and soft separator sheets 2 and 3 to the cores 13 and 14. However, it is possible to easily supply the separator sheets 2 and 3 to the cores 13 and 14 by using both the adsorbing portions 15a and 15b.

  In addition, the normal processing step and the removal processing step are excluding the point of the operation mode of both adsorption portions 15a and 15b and the presence or absence of the step relating to the supply of both electrode sheets 4 and 5 to the cores 13 and 14. Common. That is, the processes executed on the turret 12 and the cores 13 and 14 side are common in both processes. Accordingly, it is possible to prevent the operating modes of the cores 13 and 14 and the turret 12 from being greatly different in both steps. Thereby, simplification of the winding device 10 and suppression of increase in manufacturing cost can be further achieved.

  At the same time, when it is detected that there is an end of the defective portion on the downstream side of the terminal portion of the separator sheets 2 and 3 for one element to be wound next, the defective portions are detected by the winding cores 13 and 14. Until the end of is wound. Therefore, it is possible to prevent the non-defective separator sheets 2 and 3 positioned upstream from the defective portion from being wound. Thereby, it can suppress effectively that the good separator sheets 2 and 3 are removed (discarded) wastefully. As a result, the yield can be further improved, and better productivity can be obtained.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the said embodiment, the presence or absence and position of the defect part in the separator sheets 2 and 3 are detected based on the film 6 for defect identification stuck on the separator sheets 2 and 3. FIG. On the other hand, for example, the presence / absence and position of the defective portion in the separator sheets 2 and 3 may be detected based on a defect identification mark attached to the defective portion of the separator sheets 2 and 3 by a printer or the like. For example, the defect identification mark is attached to the beginning and end of the defective portion.

  Further, for example, as shown in FIG. 29, predetermined tabs 8 protruding from the edges in the width direction of the separator sheets 2 and 3 are attached to the beginning and end of the defective portions in the separator sheets 2 and 3, Based on this, the presence and position of a defective portion in the separator sheets 2 and 3 may be detected. The color of the tab 8 attached to the beginning of the defective portion is different from the color of the tab 8 attached to the end of the defective portion, so that the beginning and end of the defective portion can be detected more reliably. You may comprise.

  Furthermore, the presence or absence and position of a defective portion in the separator sheets 2 and 3 may be detected based on an IC tag that stores information related to the presence and position of a defective portion in the separator sheet. In this case, as shown in FIG. 30, the separator raw fabric 92 is configured to have a cylindrical separator core 93 formed by winding the separator sheets 2 and 3, and the IC tag 9 is attached to the separator core 93. It is good as well. The detecting means includes reading means (for example, an IC tag reader) capable of reading information stored in the IC tag, and the presence or absence of a defective portion in the separator sheets 2 and 3 based on the reading result of the IC tag by the reading means. And detect the position.

  In addition, the information for identifying the separator raw material, and the storage device that stores the information related to the presence and position of the defective portion in the separator sheets 2 and 3 and the self attached to the separator raw material are identified. The presence or absence and position of a defective portion in the separator sheets 2 and 3 may be detected based on a display unit (for example, a barcode). In this case, the detection means uses the display unit to extract information on the presence / absence and position of the defective portion from the storage device.

  Moreover, it is good also as detecting the presence or absence and position of the defect part in the separator sheets 2 and 3 based on the state of the separator sheets 2 and 3 itself, without using the film or tab attached | subjected to the separator sheets 2 and 3. FIG.

  Specifically, the detection means uses a determination value (for example, binary) used for a preset inspection from imaging data acquired by the camera 77 (which may be binarized or masked). The defect portion in the separator sheets 2 and 3 is detected using a threshold value related to the conversion processing, a determination value related to the luminance value, a determination value related to the area determination, and the like. For example, when a portion having a clear difference in luminance value compared to other portions is present in a predetermined area or more, the detecting unit detects the portion as a defective portion. And a detection means detects the presence or absence and position of the defect part in the separator sheets 2 and 3 for one element to be wound based on the detection result and the imaging position specified by the imaging position specifying unit 84a.

  By configuring as described above, the separator sheets 2 and 3 themselves are conveyed at the stage where the separator sheets 2 and 3 are conveyed to the cores 13 and 14, that is, at the stage where the battery element 1 is actually manufactured. Based on the state, the presence / absence and position of a defective portion can be detected. Therefore, it is possible to more reliably detect the presence and position of a defective portion in the separator sheets 2 and 3, and thus more reliably remove the defective portion. Moreover, it can prevent more reliably that the separator sheets 2 and 3 containing a defective part are used for the battery element 1, and can aim at the quality improvement of the battery element 1. FIG.

  (B) In the said embodiment, both separator sheets 2 and 3 are hold | maintained by clamping both separator sheets 2 and 3 by both adsorption | suction part 15a, 15b in a separator arrangement | positioning process or a separator cutting process. On the other hand, it is good also as holding both separator sheets 2 and 3 because both adsorption | suction part 15a, 15b adsorbs separator sheets 2 and 3. FIG.

  (C) In the above embodiment, when a defective portion is present on one of the separator sheets 2 and 3, only the separator sheets 2 and 3 having the defective portion are wound in the removal processing step. Yes. On the other hand, when a defective part exists in one of both separator sheets 2 and 3, you may comprise so that both separator sheets 2 and 3 may be wound in a removal process process. In this case, the adsorbing portions 15a and 15b do not need to have a function of adsorbing the separator sheets 2 and 3, and may be anything that can simply hold the separator sheets 2 and 3.

  (D) In the above embodiment, when there is a defective portion in the separator sheets 2 and 3 for one element to be wound next, the separator sheets 2 and 3 are wound according to the position of the end of the defective portion. Although it is configured so that the amount is changed, it is also possible to always wind a certain amount of separator sheets 2 and 3 (for example, separator sheets 2 and 3 for one element).

  (E) In the above-described embodiment, the various sheets 2 to 5 are directly wound around the outer periphery of the cores 13 and 14, but the cores 13 and 14 are wound around the outer periphery of the cores 13 and 14. A cylindrical core core (not shown) having a shape corresponding to the outer peripheral shape of the sheet may be arranged, and various sheets 2 to 5 may be wound around the core core.

  In this case, when removing the defective portion of the separator sheets 2 and 3, the separator sheets 2 and 3 are attached to the core core by welding or the like, and then the electrode sheets 4 and 5 are supplied to the cores 13 and 14. Without rotating, the cores 13 and 14 are rotated. Thereby, only the separator sheets 2 and 3 are wound around the core core. When the separator sheets 2 and 3 are attached to the core core, both separator sheets 2 and 3 may be attached to the core core, or the side of the separator sheets 2 and 3 where the defective portion exists. Only the core may be attached to the core.

  (F) In the above-described embodiment, the winding unit 11 includes the two winding cores 13 and 14, but the number of winding cores is not limited to this. The winding unit 11 may have a configuration including one or three or more winding cores.

  (G) In the said embodiment, although the battery element 1 of a lithium ion battery is manufactured by the winding apparatus 10, the winding element manufactured by the winding apparatus 10 is not limited to this. For example, a winding element of an electrolytic capacitor or the like may be manufactured by the winding device 10.

  (H) The material of the separator sheets 2 and 3 and the electrode sheets 4 and 5 is not limited to the above embodiment. For example, in the above embodiment, the separator sheets 2 and 3 are made of PP, but the separator sheets 2 and 3 may be made of other insulating materials. Further, for example, the active material applied to the electrode sheets 4 and 5 may be appropriately changed.

  DESCRIPTION OF SYMBOLS 1 ... Battery element (winding element), 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding device, 12 ... Turret, 13, 14 ... Core, 13c, 14c ... Slit, 15a ... first suction part, 15b ... second suction part, 16 ... separator cutter (separator cutting means), 77 ... camera (imaging means), 84a ... imaging position specifying part (imaging position specifying means), 86a ... rotation Control unit (rotation control unit), 87 ... detection unit (detection unit), 88 ... supply control unit (supply control unit), P1 ... winding position (first position), P2 ... removal position (second position).

Claims (6)

The two electrode sheets and the two separator sheets made of an insulating material are supplied to a rotatable winding core located on the downstream side, and the both winding electrode sheets and the both separator sheets are rotated by rotating the winding core. Is a winding device for manufacturing a winding element formed by winding,
Separator cutting means for cutting the separator sheet;
Detecting means for detecting the presence or absence of a defective portion in the separator sheet for one element to be wound;
When it is detected by the detection means that there is a defective portion in the separator sheet for one element to be wound next, the both electrode sheets are not supplied to the winding core. A supply control means for controlling the supply of the electrode sheet and the separator sheet so as to supply at least the side of the separator sheet where the defective portion exists to the core;
The separator sheet is wound such that the side wound around the core by the separator cutting means is separated from the upstream side after the defective portion of the separator sheet is wound by rotation of the core. A winding device characterized in that the winding device is cut.   When the supply control unit detects that there is a defective part in the separator sheet for one element to be wound next by the detection unit, the defective part exists in the two separator sheets. The winding device according to claim 1, wherein supply of the separator sheet is controlled so that only the side is supplied to the core. The supply control means includes
A first adsorption part capable of adsorbing one of the separator sheets;
A second adsorbing part capable of adsorbing the other of the separator sheets,
The winding core is movable along its own rotation axis direction and has at least a slit through which both the separator sheets can be inserted;
The core sheet moves in a state where the separator sheet is disposed at a position overlapping the slit along the rotation axis direction, and the separator sheet is inserted through the slit, so that the separator sheet is inserted into the core. Is configured to be supplied,
The first adsorbing part and the second adsorbing part respectively adsorb the separator sheet adsorbed to a position overlapping the slit along the rotation axis direction and a position deviating from the core along the rotation axis direction. The winding device according to claim 2, wherein the winding device is operable to be arranged. It has a turret that is rotatable and has a plurality of the cores at predetermined intervals in its own rotation direction.
The plurality of cores can be moved in and out of the turret by moving along the rotation axis direction,
The detection means is configured to execute a predetermined normal processing step when it is detected by the detection means that there is no defect in the separator sheet for one element to be wound next. Is configured to perform a predetermined removal processing step when it is detected that the defective portion is present,
The normal processing step and the removal processing step are common steps,
At least one of the separators is disposed at a position overlapping with the slit of the core disposed at a predetermined first position among the plurality of the cores along the rotation axis direction. Separator placement step to be placed;
After the separator arranging step, the separator core is supplied to the core by causing the core arranged at the first position to protrude from the turret and inserting the separator sheet into the slit of the core. A separator insertion step,
After the separator insertion step, the winding step in which the separator sheet is inserted into the slit is rotated, and the winding step in which the separator sheet is wound around the core;
After the winding step, by rotating the core, a winding step for winding the electrode sheet and the separator sheet supplied to the core, and
After the winding step, by rotating the turret, the turret rotation step of moving the winding core on which at least one or two separator sheets are wound to a predetermined second position;
A separator cutting step for cutting the separator sheet extending from the core disposed at the second position by the separator cutting means after the turret rotation step;
In the normal processing step,
In the separator arranging step, the both adsorbing portions are operated so that the separator sheets are arranged at a position overlapping the slit of the core arranged at the first position along the rotation axis direction,
After the winding step and before the winding step, supply both the electrode sheets to the core around which the both separator sheets are wound,
In the removal process step,
In the separator arranging step, after the separator sheets are adsorbed by the adsorbing portions, the separator sheet in which a defective portion exists is arranged in the first position along the rotation axis direction. The two adsorbing portions are operated so that the separator sheet that does not have a defective portion is disposed at a position that overlaps with the slit, and is disposed at a position that is separated from the core along the rotation axis direction.
The winding apparatus according to claim 3, wherein the electrode sheets are not supplied to the core around which the separator sheet is wound after the winding step and before the winding step. A rotation control means for controlling the rotation of the core;
The detection means is capable of detecting the position of a defective portion in the separator sheet for one element to be wound,
When the rotation control unit detects that the end of the defective part is downstream of the terminal part of the separator sheet for one element to be wound next by the detection unit, the defective part 5. The winding device according to claim 1, wherein the rotation of the core is controlled so that the wire is wound until the end of the winding. The detection means includes
In the transport path of the separator sheet upstream from the winding core, imaging means for imaging the separator sheet;
Imaging position specifying means for specifying the imaging position of the separator sheet by the imaging means,
Based on the state of the separator sheet itself in the imaging data obtained by the imaging means and the imaging position specified by the imaging position specifying means, the defect portion in the separator sheet for one element scheduled to be wound 6. The winding device according to claim 1, wherein presence / absence and position are detected.

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