JP2012056754A - Winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device capable of appropriately sticking a protection tape onto the cut section of an electrode sheet while minimizing reduction in productivity.SOLUTION: In the winding device, prior to the winding by a winding mechanism, the belt-like electrode sheet 6 fed from an original material and continuously conveyed is once cut off at the delimiting position X1 of a predetermined length to be wound. Subsequently, an upstream-side portion 6a and a downstream-side portion 6b in the cut electrode sheet 6 are separated to form a clearance 6c therebetween. Under this state, the protection tape 100 is stuck onto each side of the surface and back of the electrode sheet 6 respectively at the clearance 6c portion, in such a way as to joint the upstream-side portion 6a and downstream-side portion 6b, thereby covering the respective cut sections with the protection tape 100. Afterward, the electrode sheet 6 is wound by the predetermined length with the winding mechanism, and after the winding is completed, the protection tape 100 portion as the joint is cut off.

Description

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

  For example, in a battery element used as a secondary battery such as a lithium ion battery, a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material are overlapped via a separator sheet made of an insulating material. It is wound and manufactured in the state where it was made.

  In the winding device for manufacturing the battery element, each of the sheets supplied from the roll wound in a roll is conveyed along a separate conveyance path, and finally provided in each conveyance path. It is sent to the winding mechanism as needed by the feeding mechanism. Then, when winding of one battery element is almost completed by the winding mechanism, the rotation of the winding mechanism is temporarily stopped, and each sheet is gripped by the gripping means of each supply mechanism, and then each conveyance path is Each sheet is cut by a cutter mechanism provided on the sheet. Thereafter, winding of the battery element is completed by completely winding up the remaining winding portion of each sheet.

  At this time, the separator sheet is damaged by burrs and edges generated in the cut portion of the electrode sheet, which may cause a short circuit. Moreover, in the cut part of an electrode sheet, there exists a possibility that an active material may peel off easily by the impact at the time of a cutting | disconnection, etc.

  On the other hand, in recent years, it can be seen that a protective tape is applied to the cut portion of the electrode sheet. As a method of applying such a protective tape, for example, a technique in which a protective tape is previously applied to a planned position to be a cut portion of an electrode sheet, and the portion is cut together with the protective tape (see, for example, Patent Document 1) A technique (for example, see Patent Document 2) in which a pair of protective tapes are pasted from both the front and back surfaces of the cut portion after the electrode tape is cut is known.

JP 2002-42881 A JP 2009-245683 A

  However, if the protective tape is applied and then cut as in Patent Document 1, the cut surface of the electrode sheet is exposed, so that the separator sheet may still be damaged by burrs and edges.

  On the other hand, even if it is the structure which affixes a protective tape after cut | disconnecting an electrode sheet like the said patent document 2, when performing the said affixing process after winding of an electrode sheet, productivity will fall that much. There is a fear. In addition, it is conceivable to cut the electrode sheet into a predetermined length in advance of winding, and to attach a protective tape, but winding the electrode sheet cut into a strip shape means that the electrode It may take time to set the sheet on the winding device, it is difficult to apply tension, it is difficult to correct meandering, and the winding device may be complicated.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a winding device that can appropriately apply a protective tape to a cut portion of a sheet without reducing productivity as much as possible. One of them.

  Hereinafter, each means suitable for solving the above-described problem will be described separately. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A winding device that winds a belt-shaped sheet fed out from a roll-shaped raw fabric and continuously conveyed by a predetermined winding mechanism every predetermined length,
Sheet cutting means for cutting the sheet at a position that becomes a break for each predetermined length wound by the winding mechanism;
An upstream gripping unit capable of gripping the sheet upstream of the cutting unit and a downstream gripping unit capable of gripping the sheet downstream of the cutting unit when the sheet is cut by the sheet cutting unit; And a sheet gripping means configured to move relative to each other in a direction away from each other along the sheet conveyance direction while the gripping section grips the sheet after cutting the sheet,
A protective tape is applied from both the front and back surfaces of the sheet so as to connect the upstream portion and the downstream portion of the sheet separated by the sheet gripping means, and the gap between the upstream portion and the downstream portion of the sheet A tape applying means configured to adhere the two protective tapes to each other;
Tape cutting means for cutting the two protective tapes positioned between the end portion of the predetermined length sheet wound by the winding mechanism and the start end portion of the predetermined length sheet wound next time by the winding mechanism And a winding device.

  According to the above means 1, first, a belt-like sheet fed out from a roll-shaped raw fabric and continuously conveyed is positioned as a separator for a predetermined length of sheet to be wound prior to winding by the winding mechanism. Cut once with. Subsequently, the upstream portion and the downstream portion of the cut sheet are separated from each other, and a gap is formed between them. In this state, the protective tape is applied from both the front and back surfaces of the sheet so as to connect the upstream portion and the downstream portion of the sheet in the gap portion, and a single strip is formed again. Thereafter, the belt-like body is wound by the winding mechanism for a predetermined length, and after the winding, the protective tape portion serving as the joint is cut. As a result, the cut surfaces of both ends (starting end portion and terminating end portion) of the predetermined length of the sheet wound by the winding mechanism are wound in a state where they are covered and protected by the protective tapes affixed from both the front and back sides. Become.

  As described above, according to the configuration of the means 1, since it is possible to apply a protective tape to the sheet in advance, for example, in synchronization with the operation of the winding mechanism, etc., without reducing productivity as much as possible, A protective tape can be appropriately applied to the cut portion of the sheet.

  Further, since the sheet can be continuously conveyed from the original fabric, it does not take time and effort to set a strip-shaped sheet each time. Further, it is easy to apply tension and to perform meandering correction and the like.

  Mean 2. A buffer mechanism for absorbing a difference between the transport amount of the sheet on the upstream side and the transport amount of the sheet on the downstream side at a position downstream of the sheet cutting unit and upstream of the tape cutting unit; The winding device according to the means 1, which is provided.

  According to the above means 2, the provision of the buffer mechanism eliminates the need to synchronize the sheet winding operation by the winding mechanism and a series of operations such as sheet cutting and tape application. In the inside, a series of operations such as sheet cutting and tape sticking can be performed, and the protective tape sticking work can be performed more efficiently, and further reduction in productivity can be suppressed.

Means 3. On the downstream side of the buffer mechanism, provided with a first feeding roller for feeding the sheet downstream,
The winding device according to claim 2, further comprising a second feeding roller that feeds the sheet to the downstream side upstream of the buffer mechanism.

  According to the means 3, by providing the feeding roller separately before and after the buffer mechanism, the position of the protective tape can be positioned and the sheet conveyance before and after the buffer mechanism can be performed more appropriately and smoothly. The effect of 2 can be further enhanced.

  Means 4. The winding apparatus according to any one of means 1 to 3, wherein the sheet is an electrode sheet coated with an active material.

  When the electrode sheet coated with the active material is cut in the vicinity of the winding mechanism, there is a risk that metal sheet chips, active material powder, or the like may be involved when winding the sheet. According to the above, since the cutting position of the sheet itself can be set at an upstream position sufficiently away from the winding mechanism, not immediately before the winding mechanism, the occurrence of the above-described problem can be suppressed.

It is a cross-sectional schematic diagram for showing the structure of the battery element in one Embodiment. It is a front schematic diagram which shows a winding mechanism. It is a schematic diagram which shows schematic structure of a winding apparatus and an electrode sheet conveyance mechanism. (A)-(e) is a schematic diagram which shows the state of the electrode sheet in the sticking process etc. of a protective tape. It is a schematic diagram which shows schematic structure of a cutting sticking apparatus. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of sheet | seat cutting. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus after sheet | seat cutting | disconnection. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of tape sticking.

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

  As shown in FIG. 1, a lithium ion battery element (hereinafter referred to as “battery element”) 1 has two separator sheets 3 and 4, a positive electrode sheet 5, and a negative electrode with respect to a cylindrical core core 2. A belt-like body 7 constituted by the electrode sheet 6 is wound. In FIG. 1, for convenience of explanation, there are places where the separator sheets 3 and 4, the positive electrode sheet 5, and the negative electrode sheet 6 are spaced apart from each other.

  In the present embodiment, the core core 2 is formed of a material having sufficient rigidity (for example, a metal material such as aluminum or a resin material such as polypropylene (PP)). Further, the core core 2 has an insertion hole 8 having a non-circular cross section (in this embodiment, a square cross section).

  The separator sheets 3 and 4 have the same width as the length along the longitudinal direction of the core core 2, so as to prevent different electrode sheets 5 and 6 from contacting each other and causing a short circuit. Insulators, in particular in the present embodiment, are made of PP.

  Similarly to the separator sheets 3 and 4, the electrode sheets 5 and 6 also have substantially the same width as the length along the longitudinal direction of the core 2. The electrode sheets 5 and 6 are made of a thin metal sheet (see FIG. 4), and an active material (not shown) is applied to both the front and back surfaces at regular intervals. Specifically, for example, an aluminum foil sheet is used for the positive electrode sheet 5, and the positive electrode active material is applied to both the front and back surfaces at regular intervals. For example, a copper foil sheet is used for the negative electrode sheet 6, and the negative electrode active material is applied to both the front and back surfaces at regular intervals. Leads (not shown) are welded to the electrode sheets 5 and 6.

  When obtaining a lithium ion battery, the battery element 1 is disposed in a metallic battery container (not shown) and the lead on the positive electrode side and the lead on the negative electrode side are combined. Then, the collected positive side lead is connected to a positive terminal component (not shown), and the same negative side lead is connected to a negative terminal component (not shown). A lithium ion battery can be obtained by providing the opening at both ends of the container.

  Next, a winding device for manufacturing the battery element 1 will be described.

  As shown in FIG. 3, the winding device 60 includes an electrode sheet conveyance mechanism 61 that conveys the positive electrode sheet 5, an electrode sheet conveyance mechanism 62 that conveys the negative electrode sheet 6, and a separator sheet conveyance that conveys the separator sheets 3 and 4. Mechanisms 63 and 64 are provided. The sheets conveyed by the sheet conveying mechanisms 61 to 64 are wound by the winding mechanism 65 so that the sheets overlap each other.

  As shown in FIG. 2, the winding mechanism 65 includes a turret 12 that is rotatably provided. The turret 12 is configured such that two disk-shaped tables 14 and 15 are opposed to each other, and the rotating unit 20 is symmetric about the centers of the tables 14 and 15 across the tables 14 and 15. Two centers are provided. Both tables 14 and 15 (turret 12) are configured to rotate clockwise and are set so that both tables 14 and 15 rotate synchronously. Thereby, each rotation part 20 (core 21) can move between the attachment / detachment position P1 and the winding position P2. Note that the tables 14 and 15 may be reversible by 180 °.

  Moreover, in this embodiment, the attachment / detachment apparatus 13 for attaching the core core 2 and removing the battery element 1 is provided corresponding to the attachment / detachment position P1.

  On the other hand, the winding position P2 is a position where the belt-like body 7 is wound around the core core 2, and each of the sheet conveying mechanisms 61 to 64 is connected to the rotating unit 20 located at the winding position P2. A sheet is supplied.

  In the present embodiment, separator fixing means (not shown) is provided corresponding to the winding position P2. The separator fixing means is configured to be able to attach the leading end portions of the separator sheets 3 and 4 to the surface of the core core 2 by, for example, heat welding in the initial stage of winding. Of course, it is possible to use a configuration in which the tip portions of the separator sheets 3 and 4 are simply attached to the surface of the core core 2 using an adhesive tape or the like.

  Each of the sheet conveying mechanisms 61 to 64 is configured such that each sheet can be drawn out from the roll wound in a roll shape and supplied to the rotating unit 20. Since the electrode sheet conveyance mechanism 61 that conveys the sheet 5 and the electrode sheet conveyance mechanism 62 that conveys the negative electrode sheet 6 are characterized, the electrode sheet conveyance mechanism 62 will be described in detail below as an example.

  On the most upstream side of the electrode sheet transport mechanism 62, an original fabric 70 around which the negative electrode sheet 6 is wound in a roll shape is rotatably supported. A tension applying means 72 is provided in the middle of the conveyance path of the negative electrode sheet 6 from the original fabric 70 to the winding mechanism 65 (rotating unit 20). The tension applying means 72 in this embodiment includes a pair of rollers 73 and 74 and a step roller 75 provided between the rollers 73 and 74.

  Further, in the middle of the conveyance path of the negative electrode sheet 6 from the tension applying means 72 to the winding mechanism 65, in order from the upstream side, a sheet supply mechanism 80 as a sheet supply means, a detection sensor 81 as a detection means, a tape cutting means. A tape cutter 82 is provided.

  The sheet supply mechanism 80 includes a pair of upper and lower chucks 80a and 80b as gripping portions. The sheet supply mechanism 80 includes a chuck actuator (not shown) (for example, a motor or a cylinder), so that the chucks 80a and 80b can be opened and closed.

  The sheet supply mechanism 80 is configured to be able to advance and retract along the conveyance path of the negative electrode sheet 6. More specifically, the sheet supply mechanism 80 can be moved between a retracted position separated by a considerable distance from the winding mechanism 65 and a closest position closest to the winding mechanism 65 by an actuator (for example, a motor) (not shown). It is configured. The closest approach position is a position that is close enough to start winding of the tip of the negative electrode sheet 6 held by the chucks 80 a and 80 b based on the rotation of the rotating unit 20.

  The detection sensor 81 detects a later-described protective tape 100 attached to the negative electrode sheet 6.

  The tape cutter 82 includes an upper blade 82 a located on the upper side of the negative electrode sheet 6 and a lower blade 82 b located on the lower side of the negative electrode sheet 6, and has a function of cutting the protective tape 100.

  On the other hand, on the upstream side of the tension applying means 72, a first feeding roller 84 for winding control, a buffer mechanism 85, a second feeding roller 86 for positioning positioning of the protective tape 100, and the negative electrode sheet 6 are sequentially arranged from the downstream side. A cutting and sticking device 87 for cutting and sticking the protective tape 100 is provided.

  The first feeding roller 84 has a pair of upper and lower rollers 84a and 84b connected to a motor (not shown), and the negative electrode sheet 6 is sandwiched between the two rollers 84a and 84b in accordance with the winding operation of the winding mechanism 65. The negative electrode sheet 6 is drawn out.

  On the other hand, the second feeding roller 86 has a pair of upper and lower rollers 86a and 86b connected to a motor (not shown), an encoder (not shown), and the like. The negative electrode sheet 6 is sandwiched between both rollers 86a and 86b, and the encoder measurement is performed. Based on the value, the negative electrode sheet 6 is intermittently fed out every predetermined length wound by the winding mechanism 65.

  The buffer mechanism 85 includes a pair of driven rollers 85a and 85b and a step roller 85c provided between the rollers 85a and 85b so as to be displaceable in the vertical direction, and the feeding amount of the negative electrode sheet 6 by the first feeding roller 84. And the difference between the feeding amount of the negative electrode sheet 6 by the second feeding roller 86.

  As shown in FIG. 5 and the like, the cutting and sticking device 87 includes a cutter mechanism 90 as a sheet cutting unit that cuts the negative electrode sheet 6, and a sheet holding unit that holds the negative electrode sheet 6 when the negative electrode sheet 6 is cut by the cutter mechanism 90. And a tape applying mechanism 92 as a tape applying means for attaching the protective tape 100 (see FIG. 4C, etc.) to the cut portion of the negative electrode sheet 6.

  The cutter mechanism 90 includes an upper blade 90a positioned on the upper side of the negative electrode sheet 6 and a lower blade 90b positioned on the lower side of the negative electrode sheet 6, and the blades 90a and 90b are transport paths of the negative electrode sheet 6. It is configured to be evacuated to the outside.

  The gripping mechanism 91 includes an upstream gripping portion 91 a that can grip the negative electrode sheet 6 on the upstream side of the cutter mechanism 90, and a downstream gripping portion 91 b that can grip the negative electrode sheet 6 on the downstream side of the cutter mechanism 90. In addition, the upstream gripping portion 91a is configured to be able to advance and retract along the conveyance path of the negative electrode sheet 6 with respect to the downstream gripping portion 91b.

  More specifically, the upstream gripping portion 91a is moved between a retracted position spaced a considerable distance from the downstream gripping portion 91b and a closest approach position closest to the downstream gripping portion 91b by an unillustrated actuator (for example, a motor). It is configured to be movable. That is, each grip part 91a, 91b is comprised so that relative movement is possible in the direction which mutually spaces apart and approaches along a sheet conveyance direction. In addition, although a code | symbol is abbreviate | omitted for convenience, each holding | grip part 91a, 91b is equipped with a pair of upper and lower chucks, and the said chuck | zipper is comprised so that the said opening / closing operation | movement may be performed with a predetermined | prescribed actuator.

  The tape applying mechanism 92 includes an upper holding portion 92 a that can hold the protective tape 100 at a position above the negative electrode sheet 6, and a lower holding portion 92 b that can hold the protective tape 100 at a position below the negative electrode sheet 6. The holding portions 92a and 92b are configured to move up and down along the vertical direction by an actuator (not shown).

  The above is the description of the electrode sheet conveyance mechanism 62, but the electrode sheet conveyance mechanism 61 that conveys the positive electrode sheet 5 also has the same configuration as described above. Various mechanisms in the winding device 60 such as the winding mechanism 65 and the sheet conveying mechanisms 61 to 64 are configured to be controlled by a control device (not shown).

  Next, the manufacturing method of the battery element 1 by the winding device 60 described above will be described.

  First, the procedure for applying the protective tape 100 to the electrode sheets 5 and 6 will be described in detail using the negative electrode sheet 6 as an example.

  When the winding operation for one element by the winding mechanism 65 is completed, the first feeding roller 84 stops, while the second feeding roller 86 continues to rotate, and the negative electrode sheet 6 on the upstream side is fed out. During this time, in the buffer mechanism 85, the step roller 85c descends and the fed negative electrode sheet 6 is stored. Here, at least during the sticking operation of the protective tape 100 described later (while the second feeding roller 86 is stopped), the amount fed by the first feeding roller 84 is stored. That is, [buffer amount of the buffer mechanism 85] = [tape applying work time by the cutting and applying device 87] × [winding speed of the winding mechanism 65].

  When the winding operation for the next one element is started by the winding mechanism 65, the first feeding roller 84 and the second feeding roller 86 rotate in synchronization, and the negative electrode is fed from the original fabric 70 to the winding mechanism 65. The sheets 6 are sequentially conveyed.

  Then, based on the measurement value of the encoder provided on the second feeding roller 86, the separation position X1 (see FIG. 4A) of the negative electrode sheet 6 of a predetermined length wound by the winding mechanism 65 is a cutting and pasting device 87 ( When it is determined that the position of the cutter mechanism 90) has been reached, the second feeding roller 86 stops. On the other hand, the first feeding roller 84 continues to rotate, and the winding operation by the winding mechanism 65 is continued. Accordingly, while the second feeding roller 86 is stopped and the first feeding roller 84 is rotating, the step roller 85c is raised in the buffer mechanism 85, and the stored negative electrode sheet 6 is fed out.

  When the second feeding roller 86 is stopped and the conveyance of the negative electrode sheet 6 on the upstream side is stopped, the upstream gripping portion 91a and the downstream gripping portion 91b of the gripping mechanism 91 are driven as shown in FIG. The negative electrode sheet 6 is gripped on the upstream side and the downstream side of the cutter mechanism 90. Then, the cutter mechanism 90 is driven with the negative electrode sheet 6 held in this manner, and the negative electrode sheet 6 is cut at the separation position X1.

  After cutting the sheet, the blades 90a and 90b of the cutter mechanism 90 are retracted out of the conveyance path of the negative electrode sheet 6, and the gripping portions 91a and 91b of the gripping mechanism 91 hold the negative electrode sheet 6 as shown in FIG. Thus, only the upstream gripping portion 91a moves to the upstream side in the sheet conveying direction (the right side in FIG. 7). As a result, a gap 6c is formed between the upstream portion 6a and the downstream portion 6b of the cut negative electrode sheet 6 (see FIG. 4B). During this time, the protective tape 100 is supplied in advance from a predetermined supply device to both the holding portions 92a and 92b of the tape applying mechanism 92.

  After the gap 6c is formed between the upstream portion 6a and the downstream portion 6b of the negative electrode sheet 6, both holding portions 92a and 92b of the tape applying mechanism 92 holding the protective tape 100 are formed as shown in FIG. Each is driven to the negative electrode sheet 6 side. As a result, the protective tape 100 is affixed from both the front and back surfaces of the negative electrode sheet 6 so as to connect the upstream portion 6a and the downstream portion 6b of the negative electrode sheet 6, and the protective tape 100 is attached to each other in the gap 6c portion. It will be in the state of adhesion [refer to Drawing 4 (c)].

  Then, when the cutter mechanism 90, the gripping mechanism 91, and the tape applying mechanism 92 return to their original states (see FIG. 5) and the attaching operation of the protective tape 100 is completed, the first feeding roller 84 and the second feeding roller 86 are again set. Rotate synchronously. Then, the negative electrode sheet 6 is again transported downstream as a single band-like body, with the upstream portion 6a and the downstream portion 6b connected by the protective tape 100 continuously as before the sheet is cut. It will be.

  Next, the winding procedure by the winding mechanism 65 will be described.

  First, one rotator 20 is moved to the attachment / detachment position P1 by rotating the turret 12 halfway clockwise. At this time, the other rotating body 20 is positioned at the winding position P2. For example, the rotating body 20 that has been positioned at the winding position P <b> 2 until the winding of the belt-like body 7 is almost completed is moved to the attachment / detachment position P <b> 1. On the other hand, the rotating body 20 that has been positioned at the attachment / detachment position P1 and on which the new core core 2 is mounted is moved to the winding position P2.

  In the rotating body 20 located at the winding position P2, the core core 2 is mounted, but nothing is wound around the core core 2 at the beginning. In this state, first, the tip end portions of the separator sheets 3 and 4 are attached and fixed to the surface of the core core 2 by the separator fixing means described above.

  Subsequently, at the winding position P2, the rotating body 20 (core 21) is rotated. When the predetermined timing arrives, the sheet supply mechanisms 80 of the electrode sheet conveyance mechanisms 61 and 62 are operated, and the electrode sheets 5 and 6 are supplied toward the core 2.

  More specifically, each of the electrode sheets 5 and 6 whose tip portions have been gripped by the chucks 80a and 80b are moved toward the rotating body 20 by moving the sheet supply mechanism 80 (chuck 80a and 80b) to the core. Supplied toward the core 2. As a result, the tips of the electrode sheets 5 and 6 are sandwiched between the separator sheets 3 and 4, and the electrode sheets 5 and 6 are wound up in an insulated state through the separator sheets 3 and 4, respectively. Will start.

  When the winding of the electrode sheets 5 and 6 is started, the chucks 80a and 80b are opened. Thereby, the electrode sheets 5 and 6 are wound together with the separator sheets 3 and 4 while being given a predetermined tension by the tension applying means 72.

  As the chucks 80a and 80b are opened, the sheet supply mechanism 80 moves somewhat upstream (side away from the rotator 20) and stands by at that position during winding.

  When the winding of the belt-like body 7 is almost completed, the rotation of the rotating unit 20 is temporarily stopped. The stop timing is determined based on the detection result of the detection sensor 81, that is, the detection result of the protective tape 100. Accordingly, the rotation of the rotating unit 20 is stopped at the timing when the cutting position X2 (see FIG. 4D) of the protective tape 100 attached to the electrode sheets 5 and 6 is positioned at the position of the tape cutter 82. It will be.

  Once the rotation of the rotating unit 20 is stopped, the electrode sheets 5 and 6 are gripped by the chucks 80a and 80b of the sheet supply mechanism 80, and then each electrode sheet 5 of a predetermined length wound by the winding mechanism 65 is used. , 6 and the protective tape 100 positioned between the end portions 6e of the electrode sheets 5 and 6 of a predetermined length wound next time by the winding mechanism 65 are cut by the tape cutter 82 [FIG. 4 (e)].

  Then, after rotating the rotating part 20 somewhat, the separator sheets 3 and 4 are also cut. Then, the remaining strip 7 (sheets 3 to 6) that has been cut is completely wound up, and the winding is completed by tape-fastening the separator sheets 3 and 4 on the outer peripheral side.

  Then, the battery element 1 is obtained by moving the rotating body 20 and the like to the attachment / detachment position P1 and then removing the core core 2 around which the belt-like body 7 is wound.

  By repeating the above-described procedure, the electronic elements 1 are sequentially manufactured.

  As described above in detail, in this embodiment, prior to winding by the winding mechanism 65, the electrode sheets 5 and 6 are cut in advance, and the protective tape 100 is applied to the cut portion, so that productivity is improved. The protective tape 100 can be applied without being reduced as much as possible.

  Moreover, the electrode sheets 5 and 6 can be continuously conveyed from the original fabric 70, and it does not take time and effort to set the strip-shaped electrode sheets 5 and 6 each time. Further, it is easy to apply tension and to perform meandering correction and the like.

  Further, by providing the buffer mechanism 85, the winding operation of the electrode sheets 5 and 6 by the winding mechanism 65 and a series of operations such as cutting of the electrode sheets 5 and 6 and application of the protective tape 100 are performed in synchronization. Since it is not necessary, it is possible to more efficiently perform the attaching operation of the protective tape 100 during the winding of the electrode sheets 5 and 6, and to further suppress the reduction in productivity.

  In addition, by separately providing the feeding rollers 84 and 86 before and after the buffer mechanism 85, positioning of the sticking position of the protective tape 100 and sheet conveyance before and after the buffer mechanism 85 can be performed more appropriately and smoothly.

  In addition, when cutting the electrode sheets 5 and 6 coated with the active material in the vicinity of the winding mechanism 85, there is a risk that metal sheet chips, active material powder, or the like may be involved when the sheet is wound. According to the configuration of the present embodiment, the cutting position of the electrode sheets 5 and 6 itself can be set to an upstream position sufficiently away from the winding mechanism 85 instead of immediately before the winding mechanism 85, and thus the occurrence of the above-described problem. Can be suppressed.

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

  (A) In the above embodiment, the battery element 1 of the lithium ion battery is manufactured by the winding device 60, but the winding element manufactured by the winding device 60 is not limited to this, for example, Alternatively, a winding element of an electrolytic capacitor or the like may be manufactured.

  (B) In the said embodiment, although the battery element 1 is materialized about the case where the core core 2 is comprised, as a case where the type of battery element which does not have the said core core 2 is obtained is materialized. Also good. Further, the outer peripheral shape of the core core 2 may be, for example, a flat non-circular cross section.

  (C) The configuration of the winding device 60 (the electrode sheet conveyance mechanisms 61 and 62, the winding mechanism 65, etc.) in the above embodiment is merely an example, and other configurations may be adopted.

  For example, in the above-described embodiment, a cutting and sticking device 87 that integrally includes a cutter mechanism 90 as a sheet cutting means, a gripping mechanism 91 as a sheet gripping means, and a tape sticking mechanism 92 as a tape sticking means is employed. However, the present invention is not limited to this, and at least one of the cutter mechanism 90, the gripping mechanism 91, and the tape applying mechanism 92 may be provided independently.

  In the above-described embodiment, the upstream gripping portion 91a is configured to be able to advance and retreat along the conveyance path of the negative electrode sheet 6 with respect to the downstream gripping portion 91b. It is good also as a structure which both the holding parts 91a and 91b move relatively by the holding parts 91a and 91b moving.

  (D) A series of operations such as winding operation of the electrode sheets 5 and 6 by the winding mechanism 65, cutting of the electrode sheets 5 and 6, and application of the protective tape 100 are omitted, omitting the buffer mechanism 85 and the feeding rollers 84 and 86. It is good also as a structure which performs operation | movement synchronously.

  (E) It is good also as a structure which provided the 2nd buffer mechanism between the raw fabric 70 and the cutting sticking apparatus 87. FIG. Since the second feeding roller 86 needs to perform position control, torque control or the like cannot be performed, and it may be difficult to convey the electrode sheets 5 and 6 with an appropriate tension. By providing the mechanism, the difference between the feed amount of the original fabric 70 and the feed amount of the second feed roller 86 can be absorbed, and the occurrence of the above-described problems can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Battery element, 3, 4 ... Separator sheet, 5 ... Positive electrode sheet, 6 ... Negative electrode sheet, 7 ... Band-shaped body, 60 ... Winding device, 61, 62 ... Electrode sheet conveyance mechanism, 65 ... Winding mechanism, DESCRIPTION OF SYMBOLS 70 ... Original fabric, 80 ... Sheet supply mechanism, 81 ... Detection sensor, 82 ... Tape cutter, 84 ... First feeding roller, 85 ... Buffer mechanism, 86 ... Second feeding roller, 87 ... Cutting and sticking device, 90 ... Cutter mechanism 91 ... Grip mechanism, 91a ... Upstream side gripping part, 91b ... Downstream side gripping part, 92 ... Tape application mechanism, 100 ... Protection tape, X1 ... Separation position, X2 ... Cutting position of protection tape.

Claims (4)

A winding device that winds a belt-shaped sheet fed out from a roll-shaped raw fabric and continuously conveyed by a predetermined winding mechanism every predetermined length,
Sheet cutting means for cutting the sheet at a position that becomes a break for each predetermined length wound by the winding mechanism;
An upstream gripping unit capable of gripping the sheet upstream of the cutting unit and a downstream gripping unit capable of gripping the sheet downstream of the cutting unit when the sheet is cut by the sheet cutting unit; And a sheet gripping means configured to move relative to each other in a direction away from each other along the sheet conveyance direction while the gripping section grips the sheet after cutting the sheet,
A protective tape is applied from both the front and back surfaces of the sheet so as to connect the upstream portion and the downstream portion of the sheet separated by the sheet gripping means, and the gap between the upstream portion and the downstream portion of the sheet A tape applying means configured to adhere the two protective tapes to each other;
Tape cutting means for cutting the two protective tapes positioned between the end portion of the predetermined length sheet wound by the winding mechanism and the start end portion of the predetermined length sheet wound next time by the winding mechanism And a winding device.   A buffer mechanism for absorbing a difference between the transport amount of the sheet on the upstream side and the transport amount of the sheet on the downstream side at a position downstream of the sheet cutting unit and upstream of the tape cutting unit; The winding device according to claim 1, further comprising a winding device. On the downstream side of the buffer mechanism, provided with a first feeding roller for feeding the sheet downstream,
The winding device according to claim 2, further comprising a second feeding roller that feeds the sheet to the downstream side on the upstream side of the buffer mechanism.   The winding device according to any one of claims 1 to 3, wherein the sheet is an electrode sheet coated with an active material.

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