JP6525943B2 - Winding device - Google Patents

Description

  The present invention relates to, for example, a winding device for obtaining a winding element incorporated in a secondary battery or the like.

  For example, in a winding element used for a secondary battery such as a lithium ion battery, a positive electrode sheet to which a positive electrode active material is applied and a negative electrode sheet to which a negative electrode active material is applied are made of two insulating materials. It manufactures by being wound in the state piled up via a separator sheet.

  In a winding device for manufacturing a winding element, the two electrode sheets and the two separator sheets supplied from a roll wound in the form of a roll are conveyed to the winding portion along separate conveyance paths. . The winding unit includes, for example, a turret provided rotatably, and a plurality of winding cores which are arranged at predetermined intervals along the rotation direction of the turret and which can also rotate by themselves (for example, Patent Document 1 etc.).

  In addition, in the winding device provided with the turret as described above, the production of the winding element is performed, for example, as follows. First, both separator sheets are wound around a core located at a predetermined first position. This is achieved, for example, by welding both separator sheets to the core core provided on the outer periphery of the core, or inserting both separator sheets into slits provided on the core, and then, the core is a predetermined amount It is done by rotating only. Then, both electrode sheets are supplied to the winding core of the separator sheet. As a method of supplying both electrode sheets, for example, after holding the electrode sheet by the holding means disposed in the conveyance path of the electrode sheet, the holding means is made to approach the core and the electrode sheet is interposed between both separator sheets. Methods such as sending After supplying the electrode sheet, by rotating the winding core, both electrode sheets and both separator sheets are wound.

  Then, 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, by rotating the turret, the core is moved from the first position to the predetermined second position while both separator sheets are pulled out from the original fabric side. Subsequently, while cutting both separator sheets extended from the core side of a 2nd position, a core is rotated and a winding element is obtained by winding up the termination portion of both separator sheets.

  By the way, there may be some defects (for example, scratches) on the electrode sheet or the separator sheet. In this case, if the wound element includes the defective portion, the quality of the wound element may be degraded.

  Therefore, 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 (see, for example, Patent Document 2). If the said method is demonstrated more concretely, the defect part removal apparatus is provided corresponding to the conveyance path of the electrode sheet in the upstream rather than a core, and it can rotate while holding an electrode sheet. Equipped with materials. And when a defective part exists in an electrode sheet, when both core materials hold an electrode sheet and rotate, a defective part in an electrode sheet is rolled up. Thereafter, the electrode sheet is cut upstream of the defective portion removing device, and then both core materials wound with the defective portion are retracted from the transport path of the electrode sheet, whereby the defective portion is removed.

JP, 2009-289661, A JP, 2012-151064, A

  By the way, it is possible to provide the above-mentioned defective part removal apparatus corresponding to the conveyance path of a separator sheet, and when a defective part exists in a separator sheet, winding up and removing the defective part in this separator sheet.

  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, the device may be complicated and the manufacturing cost may be increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to effectively achieve simplification and increase and suppression of manufacturing cost while making it possible to easily remove a defective portion in a separator sheet. It is in providing an apparatus.

  Hereinafter, each means suitable for solving the above object will be described in terms of terms. In addition, the operation and effect specific to the corresponding means will be added as needed.

Means 1.2 The electrode sheets and two separator sheets made of an insulating material are supplied to a rotatable core located on the downstream side, and by rotating the core, the two electrode sheets and the electrode sheet are rotated. A winding device for producing a winding element in which both separator sheets are wound,
Separator cutting means for cutting the separator sheet;
Detection means for detecting the presence or absence of a defective portion in the separator sheet for one element scheduled to be wound;
When it is detected by the detection means that there is a defect in the separator sheet for one element to be wound next, both the electrode sheets are not supplied to the winding core. Supply control means for controlling supply of the electrode sheet and the separator sheet so as to supply at least the side of the separator sheet on which the defective portion exists to the core;
After winding the defective portion of the separator sheet by the rotation of the core, the separator sheet is separated so that the side wound on the core and the upstream side are separated by the separator cutting means. A winding apparatus characterized in that it is configured to 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 which attached to the separator sheet, the connection part of separator sheets with which the tape etc. were stuck, etc. can be mentioned.

  According to the above 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 the both separator sheets is The existing side is supplied to the winding core. Then, when the winding core rotates, the defective portion of the separator sheet is wound, and the separator cutting means separates the side wound on the winding core (the side including the defective portion) and the upstream side thereof. The separator sheet is cut to Thereby, the defect part of the separator sheet wound around the core can be removed easily. In addition, since the defect portion can be wound using a winding core that is essential for manufacturing the winding element, it is not necessary to provide a component or the like for winding the defect portion separately from the winding core. Therefore, simplification of the apparatus and suppression of increase in manufacturing cost can be effectively achieved.

  When a defective portion exists in the separator sheet, only the side of the both separators on which the defective portion exists may be wound by the winding core, or both separator sheets may be wound.

  Means 2. When the supply control means detects that there is a defect in the separator sheet for one element to be wound next by the detection means, the defect is present in both of the separator sheets. A winding device according to the means 1, characterized in that the supply of the separator sheet is controlled so that only the side is supplied to the winding core.

  According to the above-mentioned means 2, only the side on which the defective portion exists in both of the separator sheets is supplied to the winding core. That is, the side where the defective portion is not present among the two separator sheets is not supplied to the winding core. Then, only the separator sheet in which the defective portion is present is wound by the winding core. Therefore, the non-defective separator sheet can be more reliably prevented from being removed (discarded) wastefully. As a result, the yield can be improved, and the productivity can be improved.

Means 3. The supply control means is
A first adsorption unit capable of adsorbing one of the two separator sheets;
And a second adsorbing portion capable of adsorbing the other of the two separator sheets;
The winding core is movable along its own rotational axis, and has a slit through which at least the two separator sheets can be inserted.
The core is moved in a state where the separator sheet is disposed at a position overlapping with the slit along the rotation axis direction, and the separator sheet is inserted into the slit, whereby the separator sheet is inserted to the core. Are configured to be supplied,
The first suction unit and the second suction unit respectively adsorb the separator sheet adsorbed at a position overlapping with the slit along the rotation axis direction and at a position separated from the winding core along the rotation axis direction. Winding device according to means 2, characterized in that it is operable to be arranged.

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

  In addition, when there is a defect 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 defect is present overlaps the slit along the rotation axis direction. Operate the suction unit to suction. On the other hand, the adsorbing portion for adsorbing the separator sheet is operated so that the separator sheet having no defective portion is disposed at a position deviated from the core along the rotation axis direction. Then, by moving the winding core, it is possible to supply only the separator sheet in which the defective portion is present to the winding core. Therefore, the separator sheet can be selectively supplied to the core by the relatively simple configuration. As a result, simplification of the apparatus and suppression of increase in manufacturing cost can be more effectively achieved. Although it is usually difficult to supply a thin and soft separator sheet to the core, according to the above-mentioned means 3, it becomes possible to easily supply the separator sheet to the core.

Means 4. It has a turret which is rotatable and provided with a plurality of the winding cores at predetermined intervals in its rotation direction,
The plurality of winding cores can be raised and lowered relative to the turret by moving along the rotation axis direction,
When the detection means detects that there is no defect in the separator sheet for one element scheduled to be wound next, the detection means is configured to execute a predetermined normal processing step. Is configured to execute a predetermined removal processing step when it is detected that there is the defective portion by
The normal processing step and the removal processing step are common steps.
At least one separator sheet at a position overlapping the slit of the core disposed at a predetermined first position among the plurality of cores by at least one of the suction portions and along the rotation axis direction. Separator arrangement process to arrange,
After the separator disposing step, the core disposed at the first position is protruded from the turret, and the separator sheet is supplied to the core by inserting the separator sheet into the slit of the core. Separator insertion process,
After the separator inserting step, rotating the winding core having the separator sheet inserted through the slit, and winding the separator sheet around the winding core;
A winding step of winding the two electrode sheets and the two separator sheets supplied to the winding core by rotating the winding core after the winding step;
A turret rotation step of moving the winding core wound with at least one or two separator sheets to a predetermined second position by rotating the turret after the winding step;
And a separator cutting step of cutting the separator sheet extending from the core disposed at the second position by the separator cutting means after the turret rotating step.
In the normal processing step,
In the separator disposing step, the two adsorbing portions are operated such that the two separator sheets are disposed at positions overlapping the slits of the core disposed at the first position along the rotation axis direction,
After the winding step and before the winding step, the both electrode sheets are supplied to the winding core on which the both separator sheets are wound;
In the removal process,
In the separator disposing step, after both the separator sheets are adsorbed by the two adsorbing parts, the separator sheet having a defective portion is disposed at the first position along the rotation axis direction. Operating the two suction units such that the separator sheet which is disposed at a position overlapping the slit and which is free of a defect portion is disposed at a position deviated from the winding core along the rotation axis direction;
The winding device according to the means 3 characterized in that the electrode sheets are not supplied to the winding core wound with the separator sheet after the winding step and before the winding step.

  According to the above means 4, first, in the separator arrangement step, different treatments are performed in the normal treatment step and the removal treatment step. That is, in the separator disposing step of the normal processing step, the two adsorbing portions are operated so that the two separator sheets overlap the slit of the core disposed at the first position. For example, after holding or adsorbing two separator sheets by both suction parts, both suction parts are operated so that both separator sheets are disposed at the positions overlapping with the slits of the core. On the other hand, in the separator arrangement step of the removal treatment step, after both separator sheets are adsorbed by both adsorption parts, only the separator sheet in which the defective portion is present overlaps the slit of the core disposed at the first position, The two suction units are operated so that the separator sheet free of the defect portion is released 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 made to project from the turret, and the separator sheet disposed at the position overlapping the slit of the core is inserted into the slit. Thereby, one or two separator sheets are supplied to the winding core.

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

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

  In the subsequent turret rotation process, the core in the first position is moved to a predetermined second position by rotation of the turret. This turret rotation step is also performed in the same manner in the normal processing step and the removal processing step. As the turret rotates, one or two separator sheets wound around the core disposed at the second position extend upstream. The state in which one separator sheet is wound around the winding core can occur when there is a defect in the separator sheet. On the other hand, in a state in which two separator sheets are wound around the winding core, there is no defect in both separator sheets (in other words, when both electrode sheets and both separator sheets are wound around the winding core) Or a defect may occur 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. When the two separator sheets extend from the winding 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 step is also performed in the same manner in the normal processing step and the removal processing step.

  As described above, according to the above means 4, the normal processing step and the removal processing step are different from the operation mode of both suction portions and the presence or absence of the process related to the supply of both electrode sheets to the core. It is common. That is, in both processes, the process performed on the turret or core side is common. Therefore, in both processes, it is possible to prevent the operation modes such as the core and the turret from being largely different. As a result, simplification of the apparatus and suppression of increase in manufacturing cost can be further achieved.

Means 5. A rotation control unit that controls the rotation of the winding core;
The detection means can detect the position of a defect in the separator sheet for one element scheduled to be wound,
When the rotation control means detects that there is an end of a defective portion on the downstream side of the end portion of the separator sheet to be wound next by the detection means, the defective portion The winding apparatus according to any one of the means 1 to 4, characterized in that the rotation of the winding core is controlled so as to wind up to the end of.

  According to the above means 5, for example, when there is a defect in the center of the separator sheet for one element, the core can wind up to the center part of the separator sheet for one element, and more than that The upstream non-defective separator sheet can be prevented from being wound. Therefore, wasteful removal (discarding) of the non-defective separator sheet can be effectively suppressed. As a result, the yield can be further improved, and better productivity can be obtained.

Means 6. The detection means
An imaging unit configured to image the separator sheet in a conveyance path of the separator sheet upstream of the winding core;
An imaging position specifying unit for specifying an imaging position of the separator sheet by the imaging unit;
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 defective portion in the separator sheet for one element scheduled to be wound Winding device according to any of the means 1 to 5, characterized in that the presence or absence and the position are detected.

  According to the above-mentioned means 6, in the stage of conveying the separator sheet to the core, for example, in the stage of actually manufacturing the wound element, etc., a means (for example, a film etc.) Based on the state of the separator sheet itself, the presence or absence and position of a defective portion in the separator sheet can be detected. Therefore, the presence or absence and the position of the defect portion in the separator sheet can be detected more reliably, and consequently, the defect portion in the separator sheet can be more reliably removed. Moreover, it can prevent more reliably that the separator sheet containing a defect part is used for a winding element, and can aim at 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 device. It is a perspective view of a separator original fabric. It is a flowchart of a winding process. It is a block diagram which shows the electric constitution of a control apparatus etc. It is a flowchart of a normal processing process. It is a flowchart of a removal processing process. It is a schematic block diagram of a winding part etc. when a winding process is started. It is a schematic block diagram of a winding part etc. at the time of performing winding etc. of a separator sheet to a core. It is a schematic block diagram of a winding part etc. at the time of supplying a negative electrode sheet. It is a schematic block diagram of a winding part etc. at the time of supplying a positive electrode sheet. It is a schematic block diagram of a winding part etc. at the time of cutting a positive electrode sheet. It is a schematic block diagram of a winding part etc. at the time of cutting a negative electrode sheet. It is a schematic block diagram of a winding part etc. at the time of rotating a turret. It is a schematic block diagram of a winding part etc. in, when holding a separator sheet by both adsorption parts. It is a schematic block diagram of a winding part etc. in the case of cutting a separator sheet. It is a schematic block diagram of a winding part etc. in, when winding up the end portion of a separator sheet. When one separator sheet has a defective part, it is a schematic block diagram of a winding part etc. at the time of a 1st adsorption part operating. When one separator sheet has a defect part, it is a schematic block diagram of a winding part etc. in the case of performing projection of a winding core, etc. When one separator sheet has a defective part, it is a schematic block diagram of a winding part etc. in the case of winding up the said separator sheet. When one separator sheet has a defective part, it is a schematic block diagram of a winding part etc. at the time of rotating a turret. When the other separator sheet has a defective part, it is a schematic block diagram of a winding part etc. at the time of a 2nd adsorption part operating. When the other separator sheet has a defective portion, it is a schematic configuration diagram of a winding portion and the like when the winding core is protruded and the like. When the other separator sheet has a defective portion, it is a schematic configuration diagram of a winding portion and the like when the separator sheet is wound or the like. It is a schematic block diagram of a winding part etc. at the time of rotating a turret, when there is a defective part in the other separator sheet. When a defect part exists in at least one of both separator sheets, it is a schematic block diagram of a winding part etc. in holding a separator sheet by both adsorption parts. It is a schematic block diagram of a winding part etc. when winding a separator sheet with a defective part. It is a perspective schematic diagram which shows the separator original fabric in another embodiment, and the tab given to this. It is a perspective schematic diagram which shows the separator original fabric in another embodiment, and the IC tag attached to this.

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

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

  The separator sheets 2 and 3 are each in the form of a band having the same width, and an insulator such as polypropylene (PP) to prevent the different electrode sheets 4 and 5 from contacting each other and causing a short circuit. It is composed of The 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 on front and back both surfaces of the electrode sheet 4 and 5. FIG. For example, an aluminum foil sheet is used for the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles or the like) is applied to both the front and back sides. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon etc.) is applied to both the front and back sides. Then, ion exchange can be performed between the positive electrode sheet 4 and the negative electrode sheet 5 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.

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

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

  Next, a 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, a separator supply mechanism 51 for supplying the separator sheets 2 and 3 to the winding unit 11, and a controller It has 81 and. The various mechanisms in the winding device 10, such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61, are controlled in operation by the control device 81.

  The positive electrode sheet supply mechanism 31 includes a positive electrode sheet raw fabric 32 in which the positive electrode sheet 4 is wound in a roll. The positive electrode sheet material sheet 32 is supported by a rotatable support shaft 33 by drive means (not shown). As the support shaft 33 rotates, the positive electrode sheet 4 is pulled out of the positive electrode sheet raw fabric 32.

  The positive electrode sheet supply mechanism 31 further 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 is for supplying the positive electrode sheet 4 to the winding portion 11, and along the transport path of the positive electrode sheet 4, an approaching position for approaching the winding portion 11 and a distance from the winding portion 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 capable of gripping the positive electrode sheet 4. The chucks 71a and 71b are configured to be able to open and close by driving means (not shown). Then, when the positive electrode sheet 4 is supplied to the winding portion 11, the sheet inserting mechanism 71 approaches the winding portion 11 after gripping the positive electrode sheet 4 by the chucks 71a and 71b. 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 at which the pair of blade portions 72 a and 72 b is positioned so as to sandwich the positive electrode sheet 4 and a retracted position at which the positive electrode sheet 4 is retracted out of the conveyance path. It is configured.

  The cutting of the positive electrode sheet 4 is performed in a state where the positive electrode sheet 4 is gripped by the chucks 71a and 71b. When the sheet insertion mechanism 71 moves closer to the winding portion 11 in order to supply the positive electrode sheet 4 to the winding portion 11, the pair of blade portions 72a and 72b transports the positive electrode sheet 4 respectively. By moving away from the path, movement of the sheet insertion mechanism 71 is not impeded.

  The tension applying mechanism 73 has a pair of rollers 73a and 73b, and a dancer roller 73c swingably provided between the two rollers 73a and 73b. The dancer roller 73c is operated by a predetermined servomotor (not shown) whose torque is controlled, and the servomotor is controlled by the control device 81 so that tension applied to the positive electrode sheet 4 can be changed. ing. By applying tension to the positive electrode sheet 4, slackening of the positive electrode sheet 4 is prevented.

  The buffer mechanism 75 temporarily stores the positive electrode sheet 4 delivered from the positive electrode sheet raw fabric 32. The buffer mechanism 75 includes a pair of driven rollers 75a and 75b, and a lift roller 75c that is vertically displaceable between the two rollers 75a and 75b. The vertical position of the elevating roller 75 c is displaced based on the storage amount of the positive electrode sheet 4. Information on the vertical position of the elevation roller 75c is input to the control device 81.

  The negative electrode sheet supply mechanism 41 includes, on the most upstream side, a negative electrode sheet raw sheet 42 in which the negative electrode sheet 5 is wound in a roll. The negative electrode sheet material sheet 42 is supported by a rotatable support shaft 43 by drive means (not shown). As the support shaft 43 rotates, the negative electrode sheet 5 is pulled out of the negative electrode sheet raw fabric 42.

  Further, like 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 they function with the negative electrode sheet 5 as a target. Therefore, the detailed description about these is omitted.

  On the other hand, the separator feeding mechanism 51, 61 is provided with the separator original fabric 52, 62 by which the separator sheets 2 and 3 are wound by roll shape respectively. The separator original sheets 52 and 62 are supported by the support shafts 53 and 63 which can be rotated by drive means (not shown). With the rotation of the support shafts 53 and 63, the separator sheets 2 and 3 are pulled out of the separator raw fabrics 52 and 62.

  In addition, defective parts, such as a flaw, may exist in the separator sheets 2 and 3 which comprise separator original fabric 52,62. In the present embodiment, as shown in FIG. 4, the defect identification film 6 is attached in advance to the defect portions of the separator sheets 2 and 3. The defect identification film 6 is attached, for example, at a stage prior to the stage of obtaining the separator original fabric 52, 62, such as the stage of manufacturing and inspecting the separator sheets 2 and 3. In addition, the defect identification film 6 is attached to one of the front and back surfaces of the separator sheets 2 and 3 (for example, the front surface).

  Furthermore, the separator supply mechanisms 51 and 61 include a tension applying mechanism 73 and a buffer mechanism 75 as in 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 they function on the separator sheets 2 and 3. Therefore, the detailed description about these is omitted.

  In the present embodiment, the tension application mechanism 73 of each supply mechanism 31, 41, 51, 61 is configured to apply a constant tension to the various sheets 2 to 5 at all times.

  Further, the separator supply mechanisms 51 and 61 are provided with 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 rollers 76 are in a state in which the separator sheets 2 and 3 are stretched, and rotate as the separator sheets 2 and 3 are transported.

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

  Further, a camera 77 as an imaging unit is provided in the middle of the transport path of the separator sheets 2 and 3 and on the upstream side of the guide roller 76. The camera 77 captures an image of the surface of the separator sheets 2 and 3 to which the defect identification film 6 is attached. 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.

  Furthermore, a pair of nip rollers 78 a and 78 b are provided on the conveyance path of the various sheets 2 to 5 and immediately upstream of the winding unit 11. The nip rollers 78a and 78b convey the various sheets 2 to 5 to the winding unit 11 along the same conveyance path.

  Further, the nip rollers 78a and 78b are configured to be movable between a closed position and an open position, respectively, by a drive unit (not shown). In the state where the nip rollers 78a and 78b are respectively disposed at the closed position, the various sheets 2 to 5 are sandwiched by the both. The nip rollers 78a, 78b are usually arranged in the 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. 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 configuration of the winding unit 11 will be described. As shown in FIG. 2, the winding portion 11 is provided at an interval of 180 ° in the rotational direction of the turret 12 and a turret 12 consisting of two disk-shaped tables facing each other which can be rotated by drive means (not shown). The two winding cores 13 and 14, the first suction unit 15a and the second suction unit 15b, the separator cutter 16 as a separator cutting means, and the various sheets 2 to 5 after winding are prevented from being separated A pressing roller 17 and a tape application 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 core, respectively, and are configured to be rotatable with the central axis of the winding axis as the rotation axis by driving means not shown. The amount of rotation of the winding cores 13 and 14 can be detected by a predetermined winding core encoder 19 (see FIG. 6), and information on the amount of rotation of the winding cores 13 and 14 from the winding core encoder 19 is a controller It is input to 81.

  In addition, the winding cores 13 and 14 are movable along the rotation axis direction (the depth direction in the drawing of FIG. 2 and the like) of oneself, and are provided to be able to protrude and retract with respect to one of the tables constituting the turret 12. When the winding cores 13 and 14 protrude from the one table, the tip of the winding core is inserted into the receiving hole formed in the other table, and is rotatably supported by the two tables. It has become so.

  Furthermore, the winding core 13 (14) is provided with a pair of core pieces 13a and 13b (14a and 14b) extending along the axial direction (the depth direction in the drawing of FIG. 2) of each core. A slit 13c (14c) is formed between the core pieces 13a, 13b (14a, 14b). The slits 13 c and 14 c are formed to extend straight so as to pass through the rotation axes of the winding cores 13 and 14.

  In addition, the winding cores 13 and 14 are configured to be capable of pivotal movement between the winding position P1 as the first position and the removal position P2 as the second position by rotation of the turret 12. When moving from the removal position P2 to the winding position P1, the winding cores 13 and 14 move in a state of being sunk relative to 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 respective supply mechanisms 31, 41, 51, 61 to the winding position P1.

  The removal position P2 is basically a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. Further, at the removal position P2, the defective roll 7 (see FIG. 28) formed by winding at least one of the separator sheets 2 and 3 may be removed. A removal device (not shown) or the like for removing the battery element 1 and the defective roll 7 from the winding cores 13 and 14 is provided around the removal position P2.

  The first suction unit 15a and the second suction unit 15b sandwich the separator sheets 2 and 3 between the winding position P1 and the removal position P2, or adsorb the separator sheets 2 and 3, and then the separator sheets 2 and 3 are removed. It is for moving individually.

  Suction holes (not shown) for suctioning the separator sheets 2 and 3 are formed at the front end portions of the two suction portions 15a and 15b. Each suction hole is configured to be able to supply negative pressure from a predetermined vacuum pump (not shown). The first adsorbing portion 15 a can adsorb the separator sheet 3 in a state in which the 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 where the negative pressure is supplied to the suction holes.

  Furthermore, the first suction unit 15a and the second suction unit 15b are parallel to the rotation axes of the turret 12 and the winding cores 13 and 14 by drive means (not shown), and the separator sheets 2 and 3 on the nip rollers 78a and 78b side. It is configured to be pivotally movable about a pivot shaft passing through the transport path. And both adsorption | suction part 15a, 15b is made movable between a clamping position and a retracted position, respectively.

  When the two suction units 15a and 15b are disposed at the holding position, respectively, it is possible to hold the separator sheets 2 and 3 arranged from the nip rollers 78a and 78b to the removal position P2 by the two suction units 15a and 15b. See Figure 16). In this state, when the nip rollers 78a and 78b are respectively disposed at the closed position, the separator sheets 2 and 3 are in a state of passing through the rotation axes 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 winding cores 13 and 14 which are disposed at the winding position P1 and are sunk in the turret 12 and the separator sheets 2 and 3 are wound. It is possible to overlap along the rotation axis direction of the cores 13 and 14.

  In addition, when the nip roller 78a is disposed at the closing position while the first adsorption unit 15a that adsorbs the separator sheet 3 is disposed at the sandwiching position, only the separator sheet 3 is wound at the winding position P1. It is possible to overlap the slits 13 c and 14 c of the cores 13 and 14. Furthermore, when the nip roller 78b is disposed at the closing position while the second adsorption portion 15b that adsorbs the separator sheet 2 is disposed at the sandwiching position, only the separator sheet 2 is wound at the winding position P1. It is possible to overlap the slits 13 c and 14 c of the cores 13 and 14.

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

  In the present embodiment, the first suction unit 15 a moves inside the movement path of the winding cores 13 and 14 along with the rotation of the turret 12. Therefore, the enlargement of the mechanism for moving the 1st adsorption part 15a can be prevented, simplification of an apparatus, etc. can be achieved. However, in this configuration, the separator sheet 3 adsorbed by the first adsorption portion 15a is consequently present on the moving path of the winding cores 13 and 14 from the winding position P1 to the removal position P2. Become. However, in the present embodiment, the core 13 and 14 are moved from the winding position P1 to the removal position P2 in the state of being sunk in the turret 12, so that the separator sheet 3 inhibits the movement of the cores 13 and 14. There is no.

  On the other hand, the second suction unit 15b moves between the inside of the movement path of the winding cores 13 and 14 and the outside of the movement path. The second suction unit 15 b moves to the outside of the movement path of the winding cores 13 and 14 when being disposed at the retracted position. Therefore, by arranging the second adsorbing portion 15b that adsorbs the separator sheet 2 at the retraction position, the separator sheet 2 is retracted to a position deviated from the moving path of the winding cores 13 and 14 from the winding position P1 to the removal position P2. It is possible. When the winding cores 13 and 14 move 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 can not be moved in a state of death.

  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 two suction portions 15a and 15b. The separator cutter 16 can reciprocate along 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 pressing roller 17 is disposed in the vicinity of the removal position P2, and moves close to the turret 12 to press the various sheets 2 to 5 and the retracted position separated from the turret 12 so as not to prevent the movement of the winding cores 13 and 14. It is configured to be movable between

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

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

  In addition, the control device 81 has a length obtained by adding a predetermined minimum possible winding length to a length of one battery element (one element) just before the start of the winding process described later (hereinafter, referred to as The separator sheets 2 and 3 are fed so that the separator sheets 2 and 3 of “the length of (1 + α) element” are positioned in the conveyance path of the separator sheets 2 and 3 downstream of the camera 77. Just before the start of the winding process, the start end portions of the separator sheets 2 and 3 scheduled to be wound next are held by the two suction units 15a and 15b (see FIG. 9).

  The minimum takeable length is the minimum length necessary for winding the separator sheets 2 and 3 by the winding cores 13 and 14, and is smaller than the length of the separator sheets 2 and 3 for one element. It is a thing. The minimum windable length is the length of the separator sheets 2 and 3 required for winding on the winding 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 etc. of the remaining part.

  As shown 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 a detection unit. Further, 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 on the rotation amount of the guide roller 76 input from the roller encoder 76 a.

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

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

  The imaging position specifying unit 84 a specifies an imaging position by 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 identifies which part of the separator sheets 2 and 3 the imaging data relates to.

  The defect presence / absence detection unit 84 b detects the presence or absence of a defect 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 identification 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 detecting the beginning of the defect identification film 6 from the imaging data, the defect presence / absence detection unit 84b identifies this beginning as the beginning of the defect portion. Then, until the end of the defect identification film 6 is detected from the imaging data, the defect presence / absence detection unit 84b determines that the portion on the upstream side of the start end in the separator sheets 2 and 3 is a defect portion. When the end of the defect identification film 6 is detected from the imaging data, the defect presence / absence detection unit 84b specifies this end as the end of the defect portion. As a result, the defect detection unit 84b detects the area from the start to the end of the defect identification film 6 as the position of the defect.

  The detection of the defect identification film 6 may be performed, for example, by binarizing the imaging data and using the reference value regarding the degree of brightness set in advance 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 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 on the presence and the position of the defective portion in the separator sheets 2 and 3 is acquired. In the present embodiment, the defect information acquisition unit 84 determines the presence or absence of a defective portion in the separator sheets 2 and 3 having a length of at least (1 + α) elements located downstream of the camera 77 before the winding process starts. Obtain information about the position in advance.

  The storage device 85 is configured of, for example, the hard disk, and stores information related to the presence or absence and the 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 winding cores 13 and 14 and the rotation of the winding cores 13 and 14. The operation control unit 86 includes a rotation control unit 86 a as an rotation control unit, an electrode supply control unit 86 b, and a separator supply control unit 86 c.

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

  Specifically, when there is no defect in the separator sheets 2 and 3 for one element scheduled to be wound next, the rotation control unit 86 a causes the core 13 and 14 to separate the separator sheet for one element. The amount of rotation of the winding cores 13 and 14 is controlled so as to wind up to the two or three end portions. The amount of rotation of the winding cores 13 and 14 is obtained from information from the winding core encoder 19.

  On the other hand, when there is a defect in the separator sheets 2 and 3 for one element to be wound next, the rotation control unit 86a controls the winding cores 13 and 14 based on the position of the end of the defect. Control the amount of rotation.

  More specifically, when the end of the defect portion is located in the separator sheets 2 and 3 for one element, the rotation control unit 86a is configured to wind the winding cores 13 and 14 so that the end of the defect portion is wound. Control the amount of rotation. By this control, in the winding step, the separator sheets 2 and 3 for one element are wound halfway.

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

  Further, when the end of the defect portion is not positioned in the separator sheets 2 and 3 having a length of (1 + α) element, the rotation control unit 86a winds up to the end portion of the separator sheets 2 and 3 for one element. The amount of rotation of the winding cores 13 and 14 is controlled as described above.

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

  Specifically, when there is no defect in the separator sheets 2 and 3 for one element that is to be wound next, the electrode supply control unit 86 b is configured to connect both electrode sheets to the winding cores 13 and 14. The sheet insertion mechanism 71 is controlled to supply 4, 5. On the other hand, when there is a defect 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 with the sheet insertion mechanism. Control 71

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

  Specifically, when there is no defect in the separator sheets 2 and 3 for one element that is to be wound next, the separator supply control unit 86c performs both adsorption units 15a in the separator arrangement step described later. , 15b are disposed at the sandwiching positions, respectively, and the separator sheets 2 and 3 are sandwiched by the two suction parts 15a and 15b. As a result, both separator sheets 2 and 3 are supplied to the winding cores 13 and 14. In addition, when there is a defect in each of the separator sheets 2 and 3 for one element which is 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 portion in only one of the separator sheets 2 and 3 for one element scheduled to be wound next, the separator supply control unit 86c has the defective portion in the separator disposing step. The suction units 15a and 15b for suctioning the separator sheets 2 and 3 on the moving side are moved to the retracted position. On the other hand, the separator supply control unit 86c maintains the adsorbing portions 15a and 15b for adsorbing the separator sheets 2 and 3 on the side where the defect portion is not present in a state of being disposed at the sandwiching position. As a result, only the separator sheets 2 and 3 in which the defective portion is present are supplied to the winding cores 13 and 14.

  Next, the winding process of the various sheets 2 to 5 by the above-described winding device 10 will be described.

  Incidentally, prior to the winding step, one core 13 (14) disposed at the winding position P1 is in a state of being sunk in one of the tables constituting the turret 12. Moreover, before the start of the winding process, the separator sheets 2 and 3 are held by the two suction units 15a and 15b arranged at the holding position, so that both separator sheets 2 and 3 are held. . Further, the nip rollers 78a and 78b are in the state of being disposed in the closed position. In addition, the slit 13c (14c) of one winding core 13 (14) disposed at the winding position P1 has the nip rollers 78a, 78b and the both adsorptions along the rotation axis direction of the one winding core 13 (14). The separator sheets 2 and 3 located between the portions 15a and 15b are in a state of being overlapped (see FIG. 9). In FIG. 9 etc., the winding cores 13 and 14 in the state sunk in the table of the turret 12 are shown by a dotted line.

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

  If a negative determination is made in step S11, the process proceeds to step S12, and the normal process is performed, and then the winding process is ended. On the other hand, when an affirmative determination is made in step S11, the process proceeds to step S13, the removal process is performed, and the winding process is finished.

  First, the normal process will be described. In the normal processing step, as shown in FIG. 7, a separator disposing step is performed in step S21. In the separator disposing step, both the adsorbing portions 15a and 15b are maintained in the state of being disposed at the holding position. Thereby, along the rotational axis direction of one core 13 (14), the slit 13c (14c) of one core 13 (14) disposed at the winding position P1 and both separator sheets 2, 3 The overlapping state is maintained (see FIG. 9).

  Subsequently, in step S22, a separator insertion step is performed. In the separator inserting step, the one core 13 (14) protrudes from the one table constituting the turret 12 so that the both separator sheets 2 and 3 can be inserted into the slit 13 c (14 c) of the core 13 (14). Insert it. Thereby, both separator sheets 2 and 3 are supplied to one winding core 13 (14).

  Next, in step S23, a winding process is performed. In the winding step, by rotating one winding core 13 (14) by a predetermined number, the separator sheets 2 and 3 are wound and fixed by a predetermined amount around the one winding core 13 (14). Then, when the predetermined amount of separator sheets 2 and 3 is wound around one core 13 (14), both suction parts 15a and 15b are respectively moved to the retracted position (see FIG. 10).

  In the subsequent step S24, an electrode sheet supply step is performed. In the electrode sheet supplying step, first, the negative electrode sheet 5 is supplied to the one core 13 (14) side by the sheet inserting mechanism 71 of the negative electrode sheet supplying mechanism 41. Specifically, the sheet insertion mechanism 71 for gripping the negative electrode sheet 5 is brought closer to the winding portion 11 side, and the negative electrode sheet 5 is inserted between the separator sheets 2 and 3 to form one winding core 13 (14 ) (See FIG. 11). Incidentally, after the negative electrode sheet 5 is supplied, the gripping 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 feeding the negative electrode sheet 5, at a stage where one winding core 13 (14) is rotated by a predetermined number (for example, one rotation), the sheet insertion mechanism 71 with respect to one winding core 13 (14) side , Positive electrode sheet 4 is supplied. Specifically, the sheet inserting mechanism 71 for gripping the positive electrode sheet 4 is brought close to the winding portion 11 side, and the positive electrode sheet 4 is supplied between the separator sheets 2 and 3 to supply the positive electrode sheet 4. (See Figure 12). In addition, after the supply of the positive electrode sheet 4, 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 subsequent winding process of step S25, the sheet supplied to one of the various sheets 2 to 5 is wound by rotation of the one core 13 (14). In the normal processing step, since both separator sheets 2, 3 and both electrode sheets 4, 5 are supplied to one core 13 (14), both separator sheets 2, 3 and both electrode sheets 4, 5 are wound. Be done.

  Next, in step S26, an electrode sheet cutting process is performed. In the electrode sheet cutting step, when the amount of rotation of the one core 13 (14) reaches a predetermined amount, the rotation of the one core 13 (14) is temporarily stopped. 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 one core 13 (14) is resumed, and when the amount of rotation of one core 13 (14) reaches a predetermined amount, the rotation of one core 13 (14) is paused again 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).

  Then, the end portions (unrolled portions) of the electrode sheets 4 and 5 are wound by resuming the rotation of the one core 13 (14). In addition, after the rotation of the turret 12 in the turret rotation process described below, the end portions of the separator sheets 2 and 3 for one element reach a position corresponding to the separator cutter 16 between the two positions P1 and P2. The rotation amount of one winding core 13 (14) in the winding process or the like is adjusted.

  In the following step S27, a turret rotation process is performed. In the turret rotation step, the turret 12 is rotated without cutting the separator sheets 2 and 3. As a result, one winding core 13 (14) in the winding position P1 moves toward the removal position P2 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) in the removal position P2 moves toward the winding position P1 (see FIG. 15). The other core 14 (13) moves in a state of being sunk in one table of the turret 12.

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

  In the next step S28, a separator cutting process is performed. In the separator cutting step, the two suction portions 15a and 15b are moved to the holding position, and the two separator sheets 2 and 3 are held by the two suction 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 extending from the one core 13 (14) are cut at the end portions of the separator sheets 2 and 3 for one element (see FIG. 17). As a result, the separator sheets 2 and 3 wound around one winding core 13 (14) and the separator sheets 2 and 3 upstream from this are separated.

  Finally, in step S29, an end-of-winding process is performed, and the normal process is ended. In the end-of-rolling process, one winding core 13 (14) is rotated while the sheet wound around one winding core 13, 14 is held by the pressing roller 17 (see FIG. 18). As a result, the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 can be completely wound up without being separated.

  Thereafter, the end portions of the separator sheets 2 and 3 are unrolled by the fixing tape by the tape application mechanism 18 to end the end-of-roll processing. The unwound battery element 1 is removed from the one core 13 (14) by the removal device.

  Next, the removal process will be described. In the removal processing step, as shown in FIG. 8, in step S31, a separator placement step is performed. In the separator disposing step of the removing process, after both the separator sheets 2 and 3 are adsorbed by both the adsorbing parts 15a and 15b, the separator sheets 2 and 3 in which the defective portion is present are one core along the rotational axis direction. 13 (14) is disposed at a position overlapping with the slit 13c (14c), while the separator sheets 2 and 3 having no defect portion are disposed at a position deviated from one core 13 (14) along the rotation axis direction. The two suction units 15a and 15b are operated as follows.

  Specifically, when there is a defective portion only in the separator sheet 2, the separator sheet 3 is moved to the retracted position by moving the first adsorption portion 15 a that adsorbs the non-defective separator sheet 3 to the one core 13. Place it at a position out of (14). On the other hand, the 2nd adsorption part 15b which adsorbs separator sheet 2 is maintained in the state where it was arranged at a pinching position. As a result, only the separator sheet 2 having a defect portion is disposed at a position overlapping the slit 13c (14c) of the one core 13 (14) (see FIG. 19).

  In addition, when there is a defective portion only in the separator sheet 3, the non-defective separator sheet 2 is moved to the retracting position by moving the second adsorption portion 15b for adsorbing the non-defective separator sheet 2 to the retracted position. 14) Place at a position away from. 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. As a result, only the separator sheet 3 having a defective portion is disposed at a position overlapping the slit 13c (14c) of the one core 13 (14) (see FIG. 23). 19-22 is a schematic block diagram for demonstrating operation | movement of the winding apparatus 10 in, when a defect part exists only in the separator sheet 2. As shown in FIG. Moreover, FIGS. 23-26 is a schematic block diagram for demonstrating operation | movement of the winding apparatus 10 in, when a defect part exists only in the separator sheet 3. FIG.

  When there is a defect in each of the two separator sheets 2 and 3, the two separator sheets 2 and 3 can be wound by holding the two suction parts 15a and 15b in the holding position. It arrange | positions in the position which overlaps with the slit 13c (14c) of the core 13 (14).

  Next, in the separator insertion step of step S32, one core 13 (14) is made to project 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 disposed at positions overlapping the slits 13c (14c) of one core 13 (14) are inserted into the slits 13c (14c), and the separator sheets 2 and 3 in which defective portions are present It supplies to one core 13 (14) (refer FIG. 20, 24).

  Further, after the separator sheets 2 and 3 are inserted into the slit 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 stretched are moved to the open position, and the other nip rollers 78a and 78b are closed. Keep it in place. Thereby, separator sheets 2 and 3 can be made to estrange, and it can prevent that both mutually interfere. In addition, since the transport path of the separator sheets 2 and 3 when supplied to one of the winding cores 13 (14) can always be made constant, improvement in the accuracy and stability of the operation in the winding device 10 can be achieved. It can be planned.

  In addition, when a defective part exists in both separator sheets 2 and 3, one core 13 (14) protrudes from the turret 12 so that both separator sheets 2 and 3 are one core 13 (14). Supplied to In addition, the nip rollers 78a and 78b are maintained in the closed position.

  In the subsequent winding process of step S33, the one winding core 13 (14) is rotated by a predetermined number to wind the separator sheets 2 and 3 supplied thereto around the one winding core 13 (14). Fix it. This step is the same as the winding step in the normal treatment step.

  Then, when the separator sheets 2 and 3 supplied thereto are wound around one core 13 (14), the negative pressure to the suction holes of the suction portions 15 a and 15 b for suctioning the separator sheets 2 and 3 is Stop the supply. Then, the suction units 15a and 15b from which the suction of the separator sheet 2 has been released are moved to the retracted position (see FIGS. 21 and 25). In the normal processing step and the removal processing step, the timings of moving both suction portions 15a and 15b to the retracted position are different, but there is no difference in arranging both suction portions 15a and 15b to the retracted position after the winding step.

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

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

  The planned cutting position differs depending on the end position of the defect portion. In the case where there is a defect in only one of the separator sheets 2 and 3, separator sheets 2 and 3 with a length of (1 + α) element (in the separator sheets 2 and 3 in which the presence or absence of a defect part has already been detected) If the end of the defect portion is located at, the planned cutting site is regarded as the end of the defect portion. For example, if the end of the defect portion is located in the separator sheets 2 and 3 for one element, the planned cutting site is the middle part of the separator sheets 2 and 3 for one element. Further, if the end of the defect portion is located in the separator sheets 2 and 3 of the minimum rollable length connected to the separator sheets 2 and 3 of one element, the portion to be cut can be the minimum rollable. It is in the middle of the separator sheets 2 and 3 of the length.

  On the other hand, if there is a defect in only one of the separator sheets 2 and 3, cutting is performed if the end of the defect is not located in the separator sheets 2 and 3 having a length of (1 + α) element. The planned position is the end portion of the separator sheets 2 and 3 for one element.

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

  Although it is conceivable that the planned 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 windable separator sheets 2 and 3. It may be more than a large amount, which is not realistic.

  Further, in the present embodiment, when the end of the defect portion is located in the separator sheets 2 and 3 of the minimum rollable length connected to the separator sheets 2 and 3 for one element, the planned cutting position is The reason for not using the end portions of the element separator sheets 2 and 3 as the end portions of the element portion and the end of the defect portion is as follows. That is, assuming that the end portions of the separator sheets 2 and 3 for one element are to be cut, from the beginning of the separator sheets 2 and 3 to be wound next to the end of the defect after the separator cutting step. The length is shorter than the minimum takeable length. Therefore, in the next winding step, it is not possible to wind only the defective portion, and it is necessary to wind the good quality separator sheets 2 and 3 upstream from the wind to some extent. Therefore, the non-defective separator sheets 2 and 3 are included to some extent in the obtained defective roll 7, 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 performed. In the normal processing step, the electrode sheet cutting step for cutting the electrode sheets 4 and 5 is performed before the turret rotation step, but in the removal processing step, the electrode sheets 4 and 5 are processed with respect to one winding core 13 (14). The electrode sheet cutting process is unnecessary because

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

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

  Next, in the separator cutting step of step S38, as in the normal processing step, both the suction portions 15a and 15b are disposed at the holding position (see FIG. 27). Thus, when only one of the separator sheets 2 and 3 is wound, the other separator sheets 2 and 3 that have been retracted are moved to the one separator sheets 2 and 3 side. And both separator sheets 2 and 3 will be in the state where it was pinched by both adsorption parts 15a and 15b. In addition, also when both separator sheets 2 and 3 are wound, both separator sheets 2 and 3 are in a state of being held by both suction parts 15a and 15b.

  Furthermore, one of the nip rollers 78a and 78b, which is located 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 winding cores 13 (14) are cut at the portion to be cut. As a result, the separator sheets 2 and 3 including the defective portion wound around the one core 13 (14) and the separator sheets 2 and 3 upstream from this are separated.

  Since the moving path of the separator cutter 16 is constant, when only one of the separator sheets 2 and 3 is cut, the cut portions of the separator sheets 2 and 3 are the separator sheets 2 and 3 on the side not cut. It overlaps with the end of the That is, the state is the same as when both separator sheets 2 and 3 are cut at one time by the separator cutter 16. Therefore, even in the normal processing step and the removal processing step, after the separator cutting step, the start ends of the two separator sheets 2 and 3 scheduled to be wound next will be in an overlapping state.

  In the following step S39, end-of-roll processing is performed, and the removal processing step is ended. In the end-of-roll processing, as in the normal processing step, one winding core 13 (14) is rotated while the sheet wound around one winding core 13, 14 is held by the pressing roller 17. As a result, the end portions of the separator sheets 2 and 3 extending from the one core 13 (14) are wound. As a result, a defective roll 7 in which the separator sheets 2 and 3 including the defective portion are wound is obtained (see FIG. 28). Thereafter, the defective roll 7 is removed from the one core 13 (14) by the removal device, whereby the removal of the defective portion on the separator sheets 2 and 3 is completed. The fixing tape may or may not be stuck 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 winding cores 13 and 14 which are essential for the production of the battery element 1. Therefore, simplification of winding device 10 and increase control of manufacturing cost can be aimed at effectively.

  Further, only the side on which the defective portion exists among the two separator sheets 2 and 3 is supplied to the winding cores 13 and 14. Therefore, the non-defective separator sheets 2 and 3 can be more reliably prevented from being removed (discarded) wastefully. As a result, the yield can be improved, and the productivity can be improved.

  Furthermore, the separator sheets 2 and 3 can be selectively supplied to the winding cores 13 and 14 by a relatively simple configuration using both the suction sections 15a and 15b. Thereby, simplification of winding device 10 and increase control of manufacturing cost can be aimed at more effectively. Further, in a mechanism such as the sheet insertion mechanism 71 which grips the sheet and supplies it to the winding cores 13 and 14, it is difficult to supply the thin and soft separator sheets 2 and 3 to the winding cores 13 and 14. However, the separator sheets 2 and 3 can be easily supplied to the winding cores 13 and 14 by using the two suction units 15a and 15b.

  In addition, the normal processing step and the removal processing step are different from the operation mode of the both adsorption units 15a and 15b and the presence or absence of the process related to the supply of the both electrode sheets 4 and 5 to the winding cores 13 and 14. It is common. That is, in both processes, the process performed in the turret 12 and the winding cores 13 and 14 side is common. Accordingly, it is possible to prevent the operation modes of the winding cores 13 and 14 and the turret 12 from being largely different in both steps. As a result, simplification of the winding device 10 and suppression of increase in manufacturing cost can be further achieved.

  In addition, when it is detected that the end of the defective portion is on the downstream side of the end portion of the separator sheet 2 or 3 for one element to be wound next, the defective portion is detected by the core 13 or 14 Until the end of is wound. Therefore, non-defective separator sheets 2 and 3 located upstream of the defective portion can be prevented from being wound. As a result, wasteful removal (discarding) of the non-defective separator sheets 2 and 3 can be effectively suppressed. 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 applications and modifications not illustrated below are naturally possible.

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

  Further, for example, as shown in FIG. 29, predetermined tabs 8 projecting from the widthwise end edges of the separator sheets 2 and 3 are attached to the beginning and the end of the defect portion in the separator sheets 2 and 3. Based on the above, it is also possible to detect the presence or absence and the position of a defective portion in the separator sheets 2 and 3. In addition, by making the color of the tab 8 attached to the beginning of the defect portion different from the color of the tab 8 attached to the end of the defect portion, the start and end of the defect portion can be detected more reliably. You may configure it.

  Furthermore, the presence and the position of the defective part in the separator sheets 2 and 3 may be detected based on the IC tag storing information on the presence and the position of the defective part 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. You may do it. Note that the detection means includes a reading means (for example, an IC tag reader) capable of reading the information stored in the IC tag, and the presence or absence of a defective portion in the separator sheets 2, 3 based on the reading result of the IC tag by the reading means. And detect the position.

  In addition, information for identifying the separator original fabric, and a storage device for storing information related to the presence and location of the defective portion in the separator sheets 2 and 3 and identifying itself attached to the separator original fabric The presence or absence and the position of the defective portion in the separator sheets 2 and 3 may be detected based on a display unit (for example, a bar code) to be used. In this case, the detection means uses the display unit to extract information on the presence or absence and the position of the defective portion from the storage device.

  Further, the presence or absence and the position of a defective portion in the separator sheets 2 and 3 may be detected based on the state of the separator sheets 2 and 3 themselves without using films or tabs attached to the separator sheets 2 and 3.

  Specifically, the detection unit is a determination value (for example, a binary value) used for an inspection set in advance from the imaging data (which may be subjected to binarization processing or masking processing) acquired by the camera 77. Defective portions in the separator sheets 2 and 3 are 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, if there is a portion having a clear difference in luminance value as compared to other portions, the detection means detects that portion as a defective portion. And a detection means detects the existence and the position of a defective part in separator sheets 2 and 3 for one element of winding schedule based on a detection result and an imaging position specified by imaging position specific part 84a.

  By constructing as described above, at the stage of conveying the separator sheets 2 and 3 to the winding cores 13 and 14, that is, at the stage of actually manufacturing the battery element 1, the separator sheets 2 and 3 themselves It is possible to detect the presence or the position of the defective part based on the state of. Therefore, the presence or absence and the position of the defect portion in the separator sheets 2 and 3 can be detected more reliably, and thus the defect portion can be more reliably removed. Moreover, it can prevent more reliably that the separator sheets 2 and 3 containing a defect part are used for the battery element 1, and the quality improvement of the battery element 1 can be aimed at.

  (B) In the above-described embodiment, both separator sheets 2 and 3 are held by sandwiching both separator sheets 2 and 3 by both suction parts 15a and 15b in the separator arrangement step and the separator cutting step. On the other hand, both of the separator sheets 2 and 3 may be held by the two suction units 15a and 15b adsorbing the separator sheets 2 and 3, respectively.

  (C) In the above embodiment, when there is a defect in one of the separator sheets 2 and 3, only the separator sheets 2 and 3 having the defect are wound in the removal process. There is. On the other hand, when a defective part exists in one of both the 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 suction units 15a and 15b do not have to have the function of suctioning the separator sheets 2 and 3 as long as they can simply hold the separator sheets 2 and 3 therebetween.

  (D) In the above embodiment, when there is a defect in the separator sheet 2 or 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 defect. Although the amount is changed, a fixed amount of separator sheets 2 and 3 (for example, separator sheets 2 and 3 for one element) may always be wound.

  (E) In the above embodiment, the various sheets 2 to 5 are directly wound around the outer circumferences of the winding cores 13 and 14, but the winding cores 13 and 14 are provided on the outer circumference of the winding cores 13 and 14. A cylindrical core (not shown) having a shape corresponding to the outer peripheral shape of the above may be disposed, and the various sheets 2 to 5 may be wound around the core.

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

  (F) In the above embodiment, the winding unit 11 is configured to include the two winding cores 13 and 14. However, the number of winding cores is not limited to this. The winding unit 11 may be configured to include one or more winding cores.

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

  (H) The materials of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are not limited to the above embodiment. For example, in the above embodiment, the separator sheets 2 and 3 are formed of PP, but the separator sheets 2 and 3 may be formed of another insulating material. Also, for example, the active material applied to the electrode sheets 4 and 5 may be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Battery element (winding element) 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding apparatus, 12 ... Turret, 13, 14 ... Winding core, 13c, 14c ... Slit, 15a: first suction unit, 15b: second suction unit, 16: separator cutter (separator cutting means) 77: camera (imaging means) 84a: imaging position specifying unit (imaging position specifying means) 86a: rotation Control unit (rotation control means) 87: detection unit (detection means) 88: supply control unit (supply control means) 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 core located on the downstream side, and the core is rotated to rotate the both electrode sheets and the two separator sheets. A winding device for producing a winding element in which
Separator cutting means for cutting the separator sheet;
Detection means for detecting the presence or absence of a defective portion in the separator sheet for one element scheduled to be wound;
When it is detected by the detection means that there is a defect in the separator sheet for one element to be wound next, both the electrode sheets are not supplied to the winding core. Supply control means for controlling supply of the electrode sheet and the separator sheet so as to supply at least the side of the separator sheet on which the defective portion exists to the core;
After winding the defective portion of the separator sheet by the rotation of the core, the separator sheet is separated so that the side wound on the core and the upstream side are separated by the separator cutting means. A winding apparatus characterized in that it is configured to cut.   When the supply control means detects that there is a defect in the separator sheet for one element to be wound next by the detection means, the defect is present in both of the separator sheets. The winding device according to claim 1, wherein the supply of the separator sheet is controlled so that only the side is supplied to the winding core. The supply control means is
A first adsorption unit capable of adsorbing one of the two separator sheets;
And a second adsorbing portion capable of adsorbing the other of the two separator sheets;
The winding core is movable along its own rotational axis, and has a slit through which at least the two separator sheets can be inserted.
The core is moved in a state where the separator sheet is disposed at a position overlapping with the slit along the rotation axis direction, and the separator sheet is inserted into the slit, whereby the separator sheet is inserted to the core. Are configured to be supplied,
The first suction unit and the second suction unit respectively adsorb the separator sheet adsorbed at a position overlapping with the slit along the rotation axis direction and at a position separated from the winding core along the rotation axis direction. A winding device according to claim 2, characterized in that it is operable to be arranged. It has a turret which is rotatable and provided with a plurality of the winding cores at predetermined intervals in its rotation direction,
The plurality of winding cores can be raised and lowered relative to the turret by moving along the rotation axis direction,
When the detection means detects that there is no defect in the separator sheet for one element scheduled to be wound next, the detection means is configured to execute a predetermined normal processing step. Is configured to execute a predetermined removal processing step when it is detected that there is the defective portion by
The normal processing step and the removal processing step are common steps.
At least one separator sheet at a position overlapping the slit of the core disposed at a predetermined first position among the plurality of cores by at least one of the suction portions and along the rotation axis direction. Separator arrangement process to arrange,
After the separator disposing step, the core disposed at the first position is protruded from the turret, and the separator sheet is supplied to the core by inserting the separator sheet into the slit of the core. Separator insertion process,
After the separator inserting step, rotating the winding core having the separator sheet inserted through the slit, and winding the separator sheet around the winding core;
A winding step of winding the two electrode sheets and the two separator sheets supplied to the winding core by rotating the winding core after the winding step;
A turret rotation step of moving the winding core wound with at least one or two separator sheets to a predetermined second position by rotating the turret after the winding step;
And a separator cutting step of cutting the separator sheet extending from the core disposed at the second position by the separator cutting means after the turret rotating step.
In the normal processing step,
In the separator disposing step, the two adsorbing portions are operated such that the two separator sheets are disposed at positions overlapping the slits of the core disposed at the first position along the rotation axis direction,
After the winding step and before the winding step, the both electrode sheets are supplied to the winding core on which the both separator sheets are wound;
In the removal process,
In the separator disposing step, after both the separator sheets are adsorbed by the two adsorbing parts, the separator sheet having a defective portion is disposed at the first position along the rotation axis direction. Operating the two suction units such that the separator sheet which is disposed at a position overlapping the slit and which is free of a defect portion is disposed at a position deviated from the winding core along the rotation axis direction;
The winding apparatus according to claim 3, wherein both the electrode sheets are not supplied to the winding core wound with the separator sheet after the winding process and before the winding process. A rotation control unit that controls the rotation of the winding core;
The detection means can detect the position of a defect in the separator sheet for one element scheduled to be wound,
When the rotation control means detects that there is an end of a defective portion on the downstream side of the end portion of the separator sheet to be wound next by the detection means, the defective portion The winding apparatus according to any one of claims 1 to 4, wherein rotation of the winding core is controlled so that the winding is performed until the end of the winding. The detection means
An imaging unit configured to image the separator sheet in a conveyance path of the separator sheet upstream of the winding core;
An imaging position specifying unit for specifying an imaging position of the separator sheet by the imaging unit;
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 defective portion in the separator sheet for one element scheduled to be wound The winding device according to any one of claims 1 to 5, wherein presence or absence and position are detected.

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