JP2011233279A - Winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device that can enhance a material yield, etc.SOLUTION: A winding device 60 has electrode sheet feeding mechanisms 61,62 for feeding electrode sheets 5, 6 and separator sheet feeding mechanisms 63,64 for feeding separator sheets 3,4. Respective sheets fed by the respective sheet feeding mechanisms 61 to 64 are wound as a battery element with being laminated in a winding mechanism 65. A discarded material winding mechanism 80 is provided to the electrode sheet feeding mechanisms 61,62. Parts of the electrode sheets 5,6 containing defects are wound as discarded materials by the discarded material winding mechanism 80.

Description

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

  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 is transported along a separate transport path, and is finally sent out to the winding mechanism as needed by a supply mechanism provided in each transport path. Then, when the winding of one battery element by the winding core of the winding mechanism is almost completed, the rotation of the winding core is temporarily stopped, and after each sheet is gripped by the gripping means of each supply mechanism, Each sheet is cut by a cutter mechanism provided in the conveyance path. Thereafter, winding of the battery element is completed by completely winding up the remaining winding portion of each sheet. Subsequently, when starting the next winding, each supply mechanism moves while holding each sheet, and feeds the leading end portion of each cut sheet to the winding mechanism.

  In general, a defective portion including a seam or the like exists in an original sheet of an electrode sheet. Therefore, it is necessary to remove the defective part in the manufacturing process. As one method, for example, when a defective portion is detected in one of the positive and negative electrode sheets, the sheet supply of the other electrode sheet is stopped, and only one electrode sheet including the defective portion is separated from the separator sheet. At the same time, a method has also been proposed in which the product is sent to a winding mechanism and wound, and the wound product is removed as a defective product in a subsequent process (see, for example, Patent Document 1).

JP 2000-251919 A

  However, as described in JP 2000-251919 A, in a configuration in which a defective part is wound using a normal element manufacturing winding mechanism, the defective part is removed as in normal element manufacturing. The containing electrode sheet must be sent out together with the separator sheet and wound around the separator sheet. That is, even when a defective portion exists only in the electrode sheet, it is necessary to send out a good separator sheet together to eliminate this. As a result, non-defective separator sheets are wasted, resulting in a decrease in material yield and an increase in production cost.

  The present invention has been made in view of the above circumstances, and has one of the main objects to provide a winding device that can improve the material yield and the like.

  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 provided with element winding means for winding as a battery element in a state where band-like positive and negative electrode sheets coated with an active material are overlapped via a band-like separator sheet made of an insulating material. ,
In the electrode sheet transport mechanism for transporting the electrode sheet to the element winding means, a winding material comprising winding material winding means capable of winding a part of the electrode sheet including a defective portion as a discarding material. Times equipment.

  According to the above means 1, by providing the winding means dedicated to the waste material separately from the element winding means for manufacturing the element for winding the battery element as the product, the element winding means is not used. The electrode sheet including the defective portion can be wound and discarded. As a result, it is possible to improve the material yield and suppress the increase in production cost without wastefully using a good separator sheet. Furthermore, when winding the electrode sheet by the waste material winding means, there is no need to perform a work such as attaching a separator sheet to the waste material winding means, simplifying the waste material winding work or winding the waste material. It is possible to shorten the working time related to taking.

  In addition, during the winding of the waste material by the waste material winding means, it is possible to perform the work of attaching the separator sheet related to the next element manufacturing process, etc. to the element winding means for manufacturing the element. Can be suppressed.

  Even if only the electrode sheet can be wound directly around the element winding means without using the separator sheet, the active material adheres to the core of the element winding means and the like is manufactured thereafter. May affect product quality. In this regard, according to this means, the active material does not adhere to the core of the element winding means.

  In addition, for example, when it is configured to cut into a strip shape without winding up a part of the electrode sheet including a defective portion, the mechanism may be enlarged, and handling of the cut electrode sheet is troublesome. Become. In this regard, by winding up the discarded material as in the present means to form a wound body, it can be made compact and easy to handle.

Mean 2. While having a cutting means for cutting the electrode sheet at a predetermined position in the conveying direction of the electrode sheet,
In the upstream position in the conveying direction of the electrode sheet with respect to the cutting means, provided with a detecting means capable of detecting a defective portion of the electrode sheet,
2. The winding device according to claim 1, wherein the distance between the cutting means and the detection means is at least equal to or longer than the length of the electrode sheet used for one battery element.

  According to said means 2, it can prevent more reliably that a defective location mixes in the battery element wound by the element winding means. As a result, the effect of the means 1 can be further enhanced without wastefully using a good separator sheet.

  Means 3. Second detection means capable of detecting a defective portion of the electrode sheet at a position upstream of the cutting means in the conveyance direction of the electrode sheet and at a position downstream of the detection means in the conveyance direction of the electrode sheet. The winding device according to means 2, characterized by comprising:

  According to the above means 3, when the waste material is taken up by the waste material winding means, the defective portion is confirmed by the second detection means, and the waste material take-up means is controlled based on the detection result. It is possible to prevent a good electrode sheet from being discarded more than necessary.

  Moreover, in order to make the said effect more reliable, the distance of the said detection means and the said 2nd detection means shall be more than the length of the said electrode sheet used for at least one said battery element. It is more preferable.

  Means 4. The winding device according to any one of means 1 to 3, wherein the core of the discarding material winding means has a circular cross section.

  According to the means 4, for example, the fluttering of the electrode sheet during winding can be reduced and the working space of the discarded material winding means can be made compact as compared with a flat core.

  Means 5. The winding apparatus according to any one of means 1 to 4, wherein the discarding material winding means includes cover means arranged in the vicinity of its own core.

  According to the above means 5, it is possible to reduce the possibility that the powder of the active material is scattered around when the discarded material is wound up.

  Means 6. The winding apparatus according to any one of means 1 to 5, wherein the discarding material winding means is capable of supporting its own core from both sides in the axial direction at least when winding the discarding material.

  According to the above means 6, by making the winding core have a double-sided structure, it is possible to suppress the occurrence of misalignment in the width direction of the discarded material (electrode sheet) and to stably wind up the discarded material. Can do.

  If the winding process of the next battery element occurs while the winding displacement of the discarded material (electrode sheet) has occurred, the winding displacement occurs in the battery element as well as the discarded material, resulting in a decrease in product quality. There is a risk of inviting.

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. It is a perspective view which shows a rotation part etc. It is a schematic diagram which shows the one part schematic structure of an electrode sheet conveyance mechanism. It is a perspective schematic diagram which shows schematic structure of a discarded material winding mechanism. It is a perspective schematic diagram of the discarded material winding mechanism showing a state in which the discarded winding shaft unit has moved to the forward movement position. It is a perspective schematic diagram of the discarded material winding mechanism which shows the state which the punching plate moved to the advance position. It is a perspective schematic diagram of the discarded material winding mechanism showing a state in which the discarded winding shaft unit has returned to the retracted position. It is a perspective schematic diagram of the waste material winding mechanism which shows the state which collect | recovered the waste material.

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

  As shown in FIG. 1, a battery element 1 used for an EV (electric vehicle) lithium ion battery or the like has two separator sheets 3 and 4, a positive electrode sheet 5, and a cylindrical core core 2. A belt-like body 7 constituted by two electrode sheets of the negative 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 and prevent the electrode sheets 5 and 6 having different polarities from contacting each other to cause a short circuit. As much as possible, it is made of an insulator, particularly PP in this embodiment.

  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 plate-like metal sheet, and an active material is continuously applied to the front and back surfaces in the longitudinal direction. Specifically, for example, an aluminum foil sheet is used for the positive electrode sheet 5, and a positive electrode active material is applied to both the front and back surfaces. For example, a copper foil sheet is used for the negative electrode sheet 6, and a negative electrode active material is applied to both the front and back surfaces.

  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 so that the sheets overlap each other in a winding mechanism 65 serving as an element winding unit.

  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 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 °.

  As shown in FIG. 4, the rotating unit 20 extends in the axis C direction, and the winding core 21 as a rotating shaft that protrudes from the table 14 on one end side in the axis C direction toward the table 15 on the other end side, and the axis C And a core receiver 31 extending in the direction and projecting from the table 15 on the other end side in the direction of the axis C toward the table 14 on the one end side.

  The winding core 21 has a rod shape as a whole, and includes a base portion 22 extending to the other end side in the axis C direction, a mounting portion 23 extending from the base portion 22 to the other end side in the axis C direction, and the base portion 22 and the mounting portion 23. It comprises a taper stepped portion 24 formed therebetween. Further, the central axes of the base portion 22, the mounting portion 23, and the taper step portion 24 coincide with the axis C.

  The base portion 22 has a cylindrical shape and is configured to be movable relative to the table 14 along the direction of the axis C (can be moved in and out) by a driving unit (not shown). Thereby, the core 21 can be brought into contact with and separated from the core receiver 31. In addition, the base 22 can be rotated relative to the table 14 with the axis C as the rotation axis by a rotation driving means (for example, a motor) (not shown), and the entire core 21 has the axis C as the rotation axis. Relative rotation is possible. That is, the rotation driving means functions as winding power when winding the belt-like body 7.

  The mounting portion 23 is for mounting the core 2 on the outer peripheral portion when the battery element 1 is manufactured. The mounting portion 23 has a bar shape and is formed in a non-circular cross section (in this embodiment, a square cross section) to correspond to the cross sectional shape of the insertion hole 8 of the core core 2. Further, the mounting portion 23 is made thinner than the base portion 22, and a pair of tip crack portions 25 extending in the direction of the axis C are formed on the tip side surface portion of the mounting portion 23. In addition, a fitting recess (not shown) capable of fitting a later-described receiving pin 33 is formed in the inner peripheral portion of the tip crack portion 25.

  On the other hand, the core receiver 31 has a columnar support portion 32, a receiving pin 33 that is integrally formed with the support portion 32 and protrudes toward one end side in the axis C direction, and an outer peripheral side of the receiving pin 33. And a tip-shaped cylindrical receiving portion 34. The central axes of the support portion 32, the receiving pin 33, and the receiving portion 34 are coincident with the axis C.

  The support portion 32 is supported relative to the table 15 so as to be capable of relative rotation (free rotation in the present embodiment) about the axis C as a rotation axis, and relatively unmovable in the direction of the axis C.

  The receiving pin 33 has a cylindrical shape and is configured so that most of the outer peripheral surface thereof is substantially parallel to the axis C. The receiving pin 33 is disposed on the inner side of the receiving portion 34, and has an outer diameter that is the same as or slightly larger than the inner diameter of the fitting recess. The receiving pin 33 has a tapered tip at its tip so that the fitting into the fitting recess is easier.

  The receiving portion 34 has an outer diameter that is substantially equal to the outer diameter of the core core 2, and a tip surface thereof serves as a contact surface 35 that can abut one end surface of the core core 2. Yes. An annular space between the receiving portion 34 and the receiving pin 33 is an accommodating recess 36 that can accommodate the tip of the mounting portion 23, and the receiving pin 33 is fitted in the fitting recess. In this case, the tip of the mounting portion 23 is accommodated in the accommodation recess 36.

  In the rotating part 20 configured as described above, the core core 2 is attached to the mounting part 23 by the attaching / detaching device 13 described later. Then, by moving the base portion 22 relative to the other end side (table 15 side) along the axis C direction, the receiving pin 33 is fitted into the fitting concave portion, and the receiving concave portion 36 of the receiving portion 34 is fitted into the receiving concave portion 36. On the other hand, the tip of the mounting portion 23 is inserted. At this time, the front end portion of the mounting portion 23 is expanded to the outer peripheral side by the receiving pin 33, and the other end portion of the winding core 2 is held by the mounting portion 23 from the inner peripheral side. At the same time, one end of the core 2 is brought into contact with and held by the tapered stepped portion 24. Furthermore, the contact surface at the other end of the core 2 contacts the contact surface 35 of the receiving portion 34. In this way, the core core 2 is attached to the rotating unit 20.

  Here, it returns to description of the winding mechanism 65 shown in FIG. As described above, the two rotating parts 20 can move between the attachment / detachment position P1 (left position in the figure) and the winding position P2 (right position in the figure) by the rotation of the turret 12. However, in the present embodiment, an attachment / detachment device 13 for attaching a core core 2 (to be described later) and removing the battery element 1 is provided corresponding to the attachment / detachment position P1.

  Further, the winding position P2 is a position for winding the belt-like body 7 around the core core 2, and from each of the sheet conveying mechanisms 61 to 64 with respect to the rotating unit 20 located at the winding position P2. Each 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 so that each sheet can be drawn out from the roll wound in a roll shape and supplied to the rotating unit 20. In the present embodiment, in particular, Since the electrode sheet transport mechanisms 61 and 62 that transport the electrode sheets 5 and 6 are characterized, the configuration will be described in detail by taking the electrode sheet transport mechanism 62 that transports the negative electrode sheet 6 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. On the original fabric 70, a marker M (see FIG. 5) is previously attached to a defective portion including a seam or the like.

  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 includes a pair of rollers 73 and 74 and a step roller 75 provided between the rollers 73 and 74.

  Further, along the conveyance path of the negative electrode sheet 6, a waste material winding mechanism 80 as a waste material winding means is provided on the upstream side of the winding mechanism 65, and a cutter mechanism 81 as a cutting means is further provided on the upstream side. Further, a sheet supply mechanism 82 as a sheet supply unit is provided on the upstream side.

  Further, as shown in FIG. 5, the electrode sheet transport mechanism 62 is provided with a first detection sensor 83 and a second detection sensor 84. The detection sensors 83 and 84 are for detecting the marker M (defective part) on the negative electrode sheet 6.

  A second detection sensor 84 is disposed upstream of the cutter mechanism 81 along the conveyance path of the negative electrode sheet 6, and a first detection sensor 83 is disposed further upstream than the second detection sensor 84. A distance W1 between the first detection sensor 83 and the second detection sensor 84 along the conveyance path of the negative electrode sheet 6 is equal to or longer than the length of the negative electrode sheet 6 used for one battery element 1. The first detection sensor 83 constitutes the detection means in the present embodiment, and the second detection sensor 84 constitutes the second detection means.

  Next, the scraping material winding mechanism 80 will be described in detail with reference to FIG. FIG. 6 is a schematic perspective view showing a schematic configuration of the discarded material winding mechanism 80. In FIG. 6, for the sake of convenience, a portion corresponding to the negative electrode sheet 6 is provided with a dotted pattern (the same applies to FIGS. 7 to 10).

  The discarded material winding mechanism 80 includes a discarded winding shaft unit 91 disposed on the side of the conveyance path of the negative electrode sheet 6.

  The advancing winding shaft unit 91 is driven by a drive mechanism 92 as a slide driving means, along an axis D direction orthogonal to the conveyance direction of the negative electrode sheet 6, and a forward position (see FIG. 7) that intersects the conveyance path of the negative electrode sheet 6. It is provided so as to be slidable between a retracted position (refer to FIG. 6) retreated from the conveyance path of the negative electrode sheet 6.

  More specifically, the discarded winding shaft unit 91 includes a drive unit 93 that is driven along the axis D direction by the drive mechanism 92 and a cylinder that protrudes from the drive unit 93 along the axis D direction toward the conveyance path side of the negative electrode sheet 6. Shaft 94 (see FIG. 7), a disc-shaped base 95 provided at the tip of the shaft 94, and a rod-shaped core inserted through the shaft 94 so as to protrude from the base 95 96 and a cover portion 97 as a pair of cover means having a substantially arc-shaped cross section projecting from the base portion 95 toward the conveyance path side of the negative electrode sheet 6 so as to be parallel to the core 96 at the upper and lower portions of the core 96, respectively. It has.

  The winding core 96 is for winding the negative electrode sheet 6 and is connected to a motor (not shown) as a rotational driving means inside the driving unit 93 so as to be rotatable about the axis D as a rotational axis. The winding core 96 has a circular cross section, and the winding core 96 is formed with a slit 99 along the direction of the axis D in a predetermined section from the tip.

  In addition, a receiving unit 100 is provided at a position on the opposite side of the negative winding sheet unit 91 across the conveyance path of the negative electrode sheet 6. The receiving unit 100 engages with the discarded winding shaft unit 91 in a state where the discarded winding shaft unit 91 is in the advanced position.

  More specifically, the receiving part 100 includes a columnar receiving pin 103 protruding from the base part 101 toward the discarded winding shaft unit 91, and a cylindrical inner cylinder part 104 provided on the outer peripheral side of the receiving pin 103. And a cylindrical outer tube portion 105 provided on the outer peripheral side of the inner tube portion 104. The central axes of the receiving pin 103, the inner cylinder portion 104, and the outer cylinder portion 105 are coincident with the axis D.

  The receiving pin 103 is inserted into the slit 99 of the winding core 96 of the discarded winding shaft unit 91, and has a diameter that is substantially the same as the interval between the slits 99.

  The inner cylinder portion 104 has an inner diameter that is substantially equal to the outer diameter of the core 96 of the scraping winding shaft unit 91, and when the receiving pin 103 is inserted into the slit 99, the inner cylinder portion 104 is placed inside the inner cylinder portion 104. The leading end of the winding core 96 is accommodated.

  Further, an extraction mechanism 110 is provided on the side of the conveyance path of the negative electrode sheet 6 (the same side as the side on which the discarded winding shaft unit 91 is disposed).

  The extraction mechanism 110 is for extracting the negative electrode sheet 6 wound around the core 96 of the discarded winding shaft unit 91 from the core 96.

  More specifically, the extraction mechanism 110 includes a drive mechanism 111 as a slide drive unit, a drive unit 112 driven by the drive mechanism 111 along the conveyance direction of the negative electrode sheet 6, and a extraction plate protruding from the drive unit 112. 113.

  Thereby, the punching plate 113 can slide between a forward position (see FIG. 8) intersecting with the axis D (the core 96 of the scraping winding shaft unit 91) and a retracted position (see FIG. 6) retreated from the axis D. It becomes.

  The thickness of the punch plate 113 is thinner than the interval between the slits 99 and is configured to be inserted into the slits 99.

  Further, a recovery hopper 115 is provided at a position below the conveyance path of the negative electrode sheet 6 in order to recover the wound body of the negative electrode sheet 6 as a discarded material extracted from the core 96 of the discard winding shaft unit 91. .

  Although not shown, of course, the above-described discard winding mechanism 80 and the like are also provided in the electrode sheet transport mechanism 61 that transports the positive electrode sheet 5.

  Further, each mechanism in the winding device 60 such as the winding mechanism 65, the discard winding mechanism 80, the cutter mechanism 81, and the sheet supply mechanism 82 is configured to be controlled by a control device (not shown).

  Next, a procedure for manufacturing the battery element 1 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 portion 20 is positioned at the winding position P2. For example, the rotating unit 20 that has been positioned at the winding position P <b> 2 and has been almost completely wound up is moved to the attachment / detachment position P <b> 1. On the other hand, the rotating portion 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 unit 20 positioned 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 unit 20 (core 21) is rotated. When the predetermined timing arrives, the sheet supply mechanism 82 of each of the electrode sheet conveyance mechanisms 61 and 62 is operated, and the electrode sheets 5 and 6 are supplied toward the core core 2.

  More specifically, in a state where the electrode sheets 5 and 6 are gripped by the sheet supply mechanism 82, the sheet supply mechanism 82 moves toward the rotating unit 20, so that the electrode sheets 5 and 6 become the core core 2. It is sent out toward the direction.

  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 start to be wound in an insulated state through the separator sheets 3 and 4, respectively. .

  If the winding of the electrode sheets 5 and 6 is started, the electrode sheets 5 and 6 are released from the sheet supply mechanism 82 and are given a predetermined tension by the tension applying means 72 and the like, while the separator sheets 3 and 4 are applied. It will be wound together.

  The sheet supply mechanism 82 returns to the upstream side as the electrode sheets 5 and 6 are opened, and stands by at this position during winding.

  If the winding of the belt-like body 7 is almost completed, the rotation of the rotating unit 20 is stopped, the electrode sheets 5 and 6 are gripped by the sheet supply mechanism 82, and then the electrode sheets 5 and 6 are moved to the cutter mechanism. It is cut by 81.

  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, after moving the rotating part 20 and the like to the attachment / detachment position P1, the core 21 is moved relative to the direction away from the core receiver 31, and the receiving pin 33 is removed from the fitting recess. The holding force of the core core 2 by the mounting portion 23 is released. After that, the battery element 1 is obtained by removing the wound core core 2 around which the belt-like body 7 is wound together with the wound core 2 from the mounting portion 23.

  Next, regarding the processing in the case where defective portions of the electrode sheets 5 and 6 are found by the electrode sheet transport mechanisms 61 and 62 during the winding of the battery element 1 as described above, the electrode sheet transport mechanism of the negative electrode sheet 6 The case where it is found at 62 will be described in detail as an example.

  When a defective portion (marker M) on the negative electrode sheet 6 is detected by the first detection sensor 83 during winding of the battery element 1, a waste material winding process is performed after the winding of the battery element 1 is completed. Remember what to do.

  Then, after the winding of the battery element 1 is finished, the negative electrode sheet 6 is sent out downstream by the sheet supply mechanism 82, and as shown in FIG. 7, the discarded winding shaft unit 91 moves to the advance position.

  As a result, the negative electrode sheet 6 is inserted between the slits 99 of the winding core 96, and the leading end portion of the winding core 96 is accommodated in the inner cylinder portion 104 of the receiving portion 100. At the same time, the receiving pin 103 is inserted into the slit 99 of the winding core 96.

  Subsequently, the winding core 96 is rotated and winding of the negative electrode sheet 6 is started. As with the winding of the battery element 1, if the winding of the negative electrode sheet 6 is started, the negative electrode sheet 6 is released from the sheet supply mechanism 82 and is given a predetermined tension by the tension applying means 72 and the like. It is wound around a core 96.

  After the defective portion (marker M) on the negative electrode sheet 6 is detected by the second detection sensor 84, the negative electrode is equivalent to the distance W2 (see FIG. 5) from the second detection sensor 84 to the cutter mechanism 81. The sheet 6 is wound up, and the winding core 96 is temporarily stopped when the defective portion reaches slightly downstream from the cutter mechanism 81.

  When the winding core 96 is stopped, the negative electrode sheet 6 is gripped by the sheet supply mechanism 82 and then the negative electrode sheet 6 is cut by the cutter mechanism 81.

  Thereafter, the winding core 96 is slightly rotated to completely wind up the remaining cut negative electrode sheet 6 (see FIG. 8).

  Subsequently, as shown in FIG. 8, the extraction plate 113 of the extraction mechanism 110 moves to the advance position and is inserted into the slit 99 of the winding core 96. Then, in this state, as shown in FIG. 9, the discarded winding shaft unit 91 returns to the retracted position. As a result, the negative electrode sheet 6 wound around the winding core 96 falls off from the winding core 96 and is collected as a discarded material in the lower collection hopper 115 as shown in FIG.

  As described above in detail, according to the present embodiment, the waste material winding mechanism 80 dedicated to the waste material is provided separately from the winding mechanism 65 for manufacturing the battery element 1 as a product. Without using the winding mechanism 65, the electrode sheets 5 and 6 including the defective portion can be wound and discarded. As a result, it is possible to improve the material yield and suppress the increase in production cost without wastefully using the good separator sheets 3 and 4.

  Further, when the electrode sheets 5 and 6 are wound up by the discarded material winding mechanism 80, it is not necessary to perform operations such as attaching the separator sheets 3 and 4 to the discarded material winding mechanism 80. Simplification and shortening of work time related to winding of the discarded material can be achieved.

  In addition, during the winding of the discarded material by the discarded material winding mechanism 80, it is possible to perform the work of attaching the separator sheets 3 and 4 related to the next element manufacturing process to the winding mechanism 65 for manufacturing the element. Therefore, reduction in production efficiency can be suppressed.

  Even if only the electrode sheets 5 and 6 can be wound directly around the winding mechanism 65 (rotating unit 20) without using the separator sheets 3 and 4, the active material adheres to the core 21 and the like. Thereafter, the quality of the manufactured product may be affected. In this regard, according to the present embodiment, the active material does not adhere to the core 21 or the like of the winding mechanism 65. In the configuration in which the battery element 1 is wound using the core core 2 as in the present embodiment, the direct attachment of the active material to the battery element 1 is suppressed, but the waste material is wound up. Also when performing, it is necessary to use the said core core 2, and time and an effort are taken.

  Further, for example, in the case where the electrode sheets 5 and 6 including defective portions are not wound up and are cut into a strip shape, the mechanism may be enlarged, and the cut electrode sheets 5 and 6 may be cut off. Handling of 6 becomes troublesome. In this regard, by winding up the electrode sheets 5 and 6 serving as the discarded materials as in the present embodiment to form a wound body, the compact can be easily handled.

  In this embodiment, while providing the 1st detection sensor 83 and the 2nd detection sensor 84 for detecting the defective location on the electrode sheets 5 and 6, the distance W1 between both is the battery element 1 for one. It is set to be equal to or longer than the length of the electrode sheets 5 and 6 used. When a defective portion on the electrode sheets 5 and 6 is detected by the first detection sensor 83 during the winding of the battery element 1, a disposal material winding process is performed after the winding of the battery element 1 is completed. Do. Furthermore, when winding the discarded material by the discarded material winding mechanism 80, after the defective portion on the electrode sheets 5 and 6 is detected by the second detection sensor 84, the second detection sensor 84 to the cutter mechanism 81 are detected. The electrode sheets 5 and 6 are wound up by an amount corresponding to the distance W2, and when the defective portion reaches a position slightly downstream of the cutter mechanism 81, the winding core 96 is temporarily stopped and cut. For this reason, it is possible to more reliably prevent the defective portion from being mixed into the battery element 1 wound by the winding mechanism 65 and to prevent the non-defective electrode sheets 5 and 6 from being discarded more than necessary. it can.

  The core 96 of the discarded material winding mechanism 80 in this embodiment has a circular cross section. For this reason, compared with a flat core, for example, the fluttering of the electrode sheets 5 and 6 during winding can be reduced, and the working space of the discarded material winding mechanism 80 can be made compact.

  Moreover, in this embodiment, by providing the cover part 97, at the time of winding up a discard material, a possibility that the powder of an active material may scatter to circumference | surroundings can be reduced.

  In addition, by providing the receiving part 100 and the winding core 96 with a double-sided structure, it is possible to suppress the occurrence of winding displacement in the width direction of the discarded material (electrode sheets 5 and 6), and to stabilize the discarded material. And can be wound up. As a result, the winding material is shifted to the next winding step of the battery element 1 while the displacement of the discarded material (electrode sheets 5 and 6) is generated, and the occurrence of the problem that the winding displacement is generated in the battery element 1 as well as the discarded material. Can be reduced. As a result, deterioration of product quality can be suppressed.

  In addition, you may implement as follows, for example, without being limited to the description content of embodiment mentioned above.

  (A) In the winding device 60 according to the above embodiment, the material of the battery element 1 is configured to use the electrode sheets 5 and 6 to which the active material is continuously applied in the longitudinal direction. It is good also as a structure using the electrode sheet with which the active material was apply | coated by the fixed space | interval.

  (B) In the winding device 60 according to the above embodiment, the case where the battery element 1 includes the core core 2 is embodied, but a battery element of a type that does not include the core core 2 is obtained. It is good also as materializing about.

  (C) In the said embodiment, the distance W1 between the 1st detection sensor 83 and the 2nd detection sensor 84 is set more than the length of the electrode sheets 5 and 6 used for the battery element 1 for one. Yes. For example, the distance W1 between the first detection sensor 83 and the second detection sensor 84, and further the distance W1 + W2 between the first detection sensor 83 and the cutter mechanism 81 are equivalent to one battery element 1. It is good also as a structure set shorter than the length of the electrode sheets 5 and 6 used.

  In this case, for example, the waste material winding mechanism 80 may wind the waste material as follows. When a defective portion on the electrode sheets 5 and 6 is detected by the first detection sensor 83, the first detection sensor 83 and the cutter mechanism 81 are obtained after grasping the remaining winding amount of the electrode sheets 5 and 6 by the winding mechanism 65. Based on the distance W1 + W2 between the two, it is determined whether or not the defective portion is mixed in the battery element 1 currently being wound. Therefore, when it is determined that a defective portion is mixed in the battery element 1, the rotating unit 20 of the winding mechanism 65 is immediately stopped. Then, the electronic device 1 being wound is discarded and the discarded material is wound up by the discarded material winding mechanism 80. On the other hand, when it is determined that the defective portion does not enter the battery element 1, the discarded material is wound up by the discarded material winding mechanism 80 after the winding of the battery element 1 is completed as in the above embodiment.

  Note that the second detection sensor 84 may be omitted in the configuration in which the position of the subsequent defective portion can be grasped based on the detection result of the first detection sensor 83 as described above.

  (D) In the above embodiment, when winding the discarded material, the electrode sheets 5 and 6 are inserted into the slits 99 of the winding core 96, and the electrode sheets 5 and 6 are fixed to the winding core 96 by winding. It has become. For example, a winding core having a gripping function and the like and rotating in a state where the electrode sheets 5 and 6 are gripped may be employed.

  (E) In the above-described embodiment, the winding core 96 having a circular cross section is employed. However, the present invention is not limited to this. For example, a winding core having a non-circular cross section having a flat outer peripheral shape may be employed.

  (F) In the above embodiment, the cover portion 97 is provided to prevent the powder of the active material from being scattered around, but a configuration in which this is omitted may be employed.

  (G) In the above embodiment, the receiving unit 100 is provided and the winding core 96 has a double-sided structure. However, the present invention is not limited thereto, and the receiving unit 100 may be omitted and the winding core 96 may have a cantilevered structure. .

  (H) The configuration of the extraction mechanism 110 is not limited to the above embodiment. For example, the punching plate 113 may be previously fixed at the advance position. Alternatively, the electrode sheets 5 and 6 wound around the winding core 96 of the throwing-off shaft unit 91 may be grasped and extracted.

  DESCRIPTION OF SYMBOLS 1 ... Battery element, 3, 4 ... Separator sheet, 5 ... Positive electrode sheet, 6 ... Negative electrode sheet, 60 ... Winding device, 61, 62 ... Electrode sheet conveyance mechanism, 65 ... Winding mechanism, 80 ... Waste material winding mechanism , 81 ... Cutter mechanism, 82 ... Sheet supply mechanism, 83 ... First detection sensor, 84 ... Second detection sensor, 91 ... Discrete winding shaft unit, 96 ... Core, 97 ... Cover part, 99 ... Slit, 100 ... Receiving 110, extraction mechanism, 113, extraction plate, M, marker, W1, distance between the first detection sensor and the second detection sensor, W2, distance from the second detection sensor to the cutter mechanism.

Claims (6)

A winding device provided with element winding means for winding as a battery element in a state where band-like positive and negative electrode sheets coated with an active material are overlapped via a band-like separator sheet made of an insulating material. ,
In the electrode sheet transport mechanism for transporting the electrode sheet to the element winding means, a winding material comprising winding material winding means capable of winding a part of the electrode sheet including a defective portion as a discarding material. Times equipment. While having a cutting means for cutting the electrode sheet at a predetermined position in the conveying direction of the electrode sheet,
In the upstream position in the conveying direction of the electrode sheet with respect to the cutting means, provided with a detecting means capable of detecting a defective portion of the electrode sheet,
2. The winding device according to claim 1, wherein a distance between the cutting unit and the detection unit is set to be equal to or longer than a length of the electrode sheet used for at least one battery element.   Second detection means capable of detecting a defective portion of the electrode sheet at a position upstream of the cutting means in the conveyance direction of the electrode sheet and at a position downstream of the detection means in the conveyance direction of the electrode sheet. The winding device according to claim 2, wherein the winding device is provided.   The winding device according to any one of claims 1 to 3, wherein the core of the discarding material winding means has a circular cross section.   The winding device according to any one of claims 1 to 4, wherein the discarding material winding means includes cover means arranged in the vicinity of its own core.   The winding device according to any one of claims 1 to 5, wherein the discarding material winding means is capable of supporting its own core from both sides in the axial direction at least when winding the discarding material. .

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