JP6006697B2 - Winding device and method for manufacturing winding element - Google Patents

Description

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

  For example, a battery element used as a secondary battery such as a lithium ion battery has two separators in which a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material are made of an insulating material. It is manufactured by being wound in a state of being overlapped via a sheet.

  In the winding device for manufacturing the battery element, each of the sheets supplied from the roll wound in a roll is conveyed to the winding unit along a separate conveyance path, and the winding unit Each sheet is wound with the sheets stacked.

  Then, when each sheet is wound for a predetermined length, the winding operation is temporarily stopped and each sheet is cut. Then, the winding operation of the battery element is completed by completely winding up the unwinding portion of each sheet.

  Further, after the winding is completed, a winding stopper tape is applied to the battery element in order to prevent the sheets from coming apart (see, for example, Patent Document 1).

  In general, the winding tape 101 is applied to the winding element 101 having a circular cross section wound by a winding core 100 having a circular cross section as shown in FIG. Is called.

  First, when the winding operation of the winding element 101 is completed, the winding core 100 (winding element 101) is rotated, and the position of the terminal portion of the outermost peripheral sheet 103 is opposed to the tape applying apparatus 105 with a predetermined tape application. Positioning to a position (predetermined position in the core rotation direction) [see FIG. 17 (a)]. Subsequently, the tape applying device 105 moves toward the winding element 101, and the winding tape 102 is attached to the peripheral surface of the winding element 101. Thereby, the terminal portion of the sheet 103 is wound by the winding tape 102, and the winding operation of the winding element 101 is completed.

  When the core 100 having a circular cross section is used, the core 100 may be used even when the length of the wound sheet is different due to, for example, the type of the wound element 101 to be manufactured. By rotating the (winding element 101), the terminal portion of the sheet 103 can be properly positioned at the tape application position each time without being affected by the difference in the type.

  That is, the relative positional relationship and orientation between the terminal portion of the sheet 103 and the tape applicator 105, the posture of the sheet 103, and the like are constant every time, and the operation mode of the tape applicator 105 can also be constant every time.

JP-A-10-255815

  However, in recent years, as shown in FIG. 17B, a non-circular core 110 may be used to manufacture a flat wound element 111.

  In such a case, depending on the type of the winding element 111 to be manufactured (difference in the length of the wound sheet), the position of the terminal portion of the outermost sheet 113 and the rotational axis position of the core 110 are different. The relative positional relationship will change.

  For this reason, even if the winding core 110 (winding element 111) is rotated after the winding of the winding element 111 is completed, only the attitude of the winding element 111 changes [the two-dot chain line in FIG. Reference] In some cases, the terminal portion of the sheet 113 cannot be positioned at a predetermined tape application position in an appropriate direction so as to face the tape application device 115.

  In such a case, if the posture, height position, operation mode, etc. of the tape applying device 115 are not changed in accordance with the posture change of the winding element 111, the winding tape 112 is appropriately applied to the winding element 111. There is a risk that it cannot be done. However, configuring the tape sticking device 115 such that the posture, height position, operation mode, and the like can be changed may cause a complicated mechanical structure and operation control.

  By setting the length of the outermost peripheral sheet 113 to be longer than the product specification, the end of the sheet 113 is positioned at a predetermined tape application position each time without being affected by the difference in product type. Although it is conceivable to adopt a configuration, in such a configuration, the material is wasted and the size of the battery may be increased.

  This invention is made | formed in view of the said situation, The objective is providing the manufacturing method of the winding device which can stick a winding tape appropriately with respect to a winding element, and a winding element. One of the main purposes.

  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 capable of manufacturing a winding element having a non-circular cross section by winding and winding a belt-like positive and negative electrode sheet coated with an active material and a belt-like separator sheet made of an insulating material,
A winding core that can be wound in a state in which various sheets of the positive and negative electrode sheets and the separator sheet that are continuously supplied from a roll-shaped raw material are stacked;
After the various sheets are wound around the core for a predetermined length, a sheet cutting means capable of cutting the various sheets at a position serving as a separation on the terminal side of the wound various sheets;
At least before the unwinding portion of the various sheets is wound around the core, the winding is stopped against the terminal portion of the sheet (for example, the positive electrode sheet) located on the outermost peripheral side of the core among the various sheets. A tape applying means capable of applying a tape;
And a rotatable pressing roller being driven by the movement to be wound of the sheet while pressing the various sheet wound on the winding core,
The winding device, wherein when the unwinding portion of the various sheets is wound around the core, the winding tape can be pressed and pasted onto the circumferential surface of the winding element by the pressing roller.

  Here, an example of a work procedure of winding work and winding work of various sheets using the winding device of the means 1 will be shown. First, various sheets supplied continuously from a roll-shaped raw fabric are wound with a core while being superposed, and when the various sheets are wound for a predetermined length, the core is temporarily stopped. Subsequently, various sheets wound around the core are pressed by pressing rollers. And the sheet | seat located in the outermost periphery side of a winding core is cut | disconnected, and a winding stop tape is affixed with respect to the terminal part. At the same time, other sheets are also cut. Thereafter, the core is rotated again while the various sheets are pressed by the pressing roller, and the unwinding portion of the various sheets is wound up. As a result, the unwinding portions of the various sheets are completely wound up without being scattered, and the end portions of the outermost peripheral sheets are wound with the winding tape, thereby completing the winding element.

  Thus, according to the above means 1, before winding the unwinding portion of the various sheets around the winding core, by sticking the winding stop tape in advance to the terminal portion of the outermost peripheral side sheet, When winding the unwinding portion of the various sheets around the core, the winding stop tape can be pressed against the peripheral surface of the winding element with a pressing roller.

  As a result, even if the position of the terminal end portion of the outermost peripheral sheet is located at any position of the winding element having a non-circular cross section wound around the winding core, the winding stopper tape can be appropriately applied. In other words, regardless of the shape of the winding element (core), even if the winding element has a non-circular cross section, the type of winding element to be manufactured (difference in the length of the wound sheet) ), The terminal portion of the outermost peripheral sheet can be appropriately wound around the circumferential surface of the winding element by the winding tape.

  Furthermore, since it is not necessary to change the operation mode of the tape applying means every time according to the difference in the shape and type of the wound element to be manufactured, it is possible to suppress the complexity of the mechanical structure and operation control. it can. As a result, the work at the time of switching the production type of the winding element can be simplified, and versatility can be improved.

  In addition, before winding up the unwinding portion of the sheet around the core, as a configuration in which a winding stopper tape is applied in advance to the end portion of the sheet, for example, the sheet is previously cut into a strip shape, and the end portion It is also possible to prepare a structure in which a winding tape is affixed to and wound around a winding core.

  However, in order to wind a sheet that has been cut into a strip shape without meandering, the end of the strip sheet is gripped by gripping means such as a chuck, and tension is applied in the direction opposite to the winding direction. It is necessary to wind straight around the winding core along the guide means such as a guide rail. That is, a mechanism such as a chuck or a guide rail is required, which may increase the size of the winding device. In particular, in recent years, since the winding element such as a lithium ion battery element tends to be large (the sheet is long), the above-described problem may be more remarkable.

  In addition, in a state where the anti-winding tape is attached to the end portion of the sheet, it is difficult to properly grip the end portion of the sheet, so that it is difficult to apply tension and it may be difficult to perform proper meandering regulation. . Furthermore, since it is necessary for an operator or the like to set a sheet cut into strips each time on a core or a chuck, it takes time and labor, and productivity may be significantly reduced.

  In this regard, according to the present means, the sheet is continuously supplied from the roll-shaped raw fabric to the winding core without being cut into strips in advance, and the winding operation is performed. It is easy to apply the tension necessary for turning work, and it is easy to regulate meandering. Further, the above-described mechanism such as a chuck or a guide rail is not required, and there is no need to set a strip-shaped sheet each time. As a result, an increase in the size of the winding device and a decrease in productivity can be suppressed.

  In addition, as a configuration in which the terminal portion of the sheet is taped without being affected by the shape of the winding element (winding core), for example, under the configuration in which the pressing roller can adsorb and hold the winding tape, A configuration is also conceivable in which the winding-stopping tape is stuck with a pressing roller while winding the unwinding portion around the winding core.

  However, in such a configuration, it is necessary to use a relatively large roller as a pressing roller that holds the winding tape by suction. For this reason, the load which a press roller gives to a winding element becomes large. As a result, a tension more than necessary is applied to the wound sheet, and the winding element may be tightened. If such tightening occurs, the battery performance may be affected.

  On the other hand, this means is configured to affix a winding tape in advance to the end of the outermost sheet before winding the unwinding portion of various sheets around the core, Since the roller merely presses the various sheets and the winding tape, there is no need to increase the size, and no excessive tension is applied to the sheet during winding. As a result, it is possible to suppress the occurrence of problems such as winding tightening as described above.

  In addition, according to this means, it is not necessary to set the length of the outermost peripheral sheet longer than the product specification, so that the sheet is not consumed wastefully and the increase in the size of the battery is suppressed. Can do.

  Mean 2. After the cutting of the outermost sheet and before the unwinding portion of the sheet is wound around the core, the unrolled portion of the sheet is provided so as to be rotatable in accordance with the movement of the sheet. The winding device according to claim 1, further comprising a pair of clamping rollers.

  After the outermost sheet is cut, when the unwinding portion of the sheet is wound around the core, the unwinding portion of the sheet is not held at all and is in a free state. There is a risk that the sheet will be wound (displaced in the sheet width direction) due to the influence of its own habit or static electricity. In particular, when the winding element (winding core) has a non-circular cross section, the position of the unwinding portion of the sheet is not constant and may flutter.

  When a winding operation is performed while the sheet is displaced with respect to the core, the end of the sheet protrudes, the sheet is wrinkled or loosened, or the sheet is wound in a meandering manner. There is a concern about the deterioration of the quality of the obtained winding element.

  In particular, when the outermost sheet itself has a habit (warp in the width direction, etc.), when the sheet is cut, it is applied to the unrolled portion of the sheet that is cut and not held at all. When the tension that has been applied is released, bending (curl) in the width direction may occur. As described above, when the unwinding portion of the sheet is curved in the width direction, the above-described problem may be more noticeable when the unwinding portion of the sheet is wound around the winding core.

  In this regard, according to the means 2, by providing the pinching roller, the winding operation of the sheet can be performed while applying tension to the unrolled portion of the sheet and correcting the warp of the sheet. It can be carried out. As a result, wrinkles, slack, meandering, and the like can be suppressed from occurring on the wound sheet.

  Means 3. The winding device according to means 1 or 2, wherein the outermost peripheral sheet is an electrode sheet coated with an active material.

  In addition, residual stress tends to remain in an electrode sheet manufactured by applying an active material to a predetermined metal sheet, and warpage or the like is likely to occur after manufacturing (after drying). In particular, in a continuous coated electrode sheet raw material that is frequently used in recent years in the manufacture of lithium ion battery elements and the like, generally, a predetermined portion in the sheet width direction is an active material coated portion, and the remaining portion is an uncoated portion. For this reason, warpage (curl) or the like in the sheet width direction is relatively likely to occur. Therefore, when the outermost sheet is an electrode sheet, curling is likely to occur, and there is a risk that meandering or the like is likely to occur. Therefore, under the configuration of the means 3, the configuration of the means 2 is more effective.

  Means 4. Any one of means 1 to 3, further comprising: an adsorbing means capable of adsorbing and holding an unwinding portion of the sheet when adhering the winding tape to the outermost peripheral sheet by at least the tape applying means. A winding device according to any one of the above.

  According to the means 4, when the winding tape is applied to the end portion of the sheet, it is possible to position the sheet while correcting the warp of the sheet. Thereby, a winding stop tape can be appropriately affixed in a good state in which wrinkles, slack, warpage, and the like are not generated on the sheet.

  Further, if the unwinding portion of the sheet is adsorbed and the unwinding portion of the sheet is wound around the core, the same effects as the above-described means 2 can be obtained.

  Means 5. Winding of the outermost sheet (for example, a positive electrode sheet) of the various sheets at a stage after the various sheets are cut and before an unwinding portion of the various sheets is wound on the core. Any one of means 1 to 4, further comprising separation means for maintaining the remaining portion and the remaining unrolled portion of other sheets (for example, a separator sheet and a negative electrode sheet) other than the remaining portion in a separated state. Winding device.

  Depending on the product specifications, the length of other sheets may be longer than the length of the outermost sheet. In such a case, if the unwinding portion of the outermost sheet and the unwinding portion of another sheet longer than this are not separated, the other winding tape is attached to the end of the outermost sheet. The sheet may stick to the unrolled portion of the sheet, and the various sheets may not be properly wound.

  On the other hand, by providing the separating means as in this means, it is possible to suppress the occurrence of the above-described problems and to properly wind up various sheets.

Means 6. A turret provided so as to be rotatable about its central axis as a rotation axis;
A plurality of the cores arranged at predetermined intervals in the rotation direction of the turret;
After winding the various sheets supplied to the first core in the first position among the plurality of cores for a predetermined length, the turret is rotated to move the first core to the second position. Turret control means for moving and moving a second winding core different from the first winding core to the first position;
After the first core is moved to the second position, the various sheets wound around the first core are pressed by the pressing roller, and the outermost circumferential side is pressed by the tape applying means. The winding apparatus according to any one of means 1 to 5, wherein after winding a tape is applied to the end portion of the sheet, the unwinding portion of the various sheets is wound around the first winding core. .

  According to the means 6, after the winding operation at the first position is completed, the first core moves toward the second position and the second core newly moves toward the first position. Thereafter, the unwinding portion of the various sheets is wound around the first core at the second position, and a new winding is performed on the second core at the first position.

  That is, by rotating the turret, the plurality of cores are sequentially moved to the first position and the second position, and at each position, the winding operation of various sheets, the winding operation of the unwinding portion of the sheet, Various operations such as a winding operation using a winding tape can be performed at the same time. As a result, productivity can be improved as compared with a winding device having only one winding core.

Mean 7 This is a method of manufacturing a wound element capable of manufacturing a wound element having a non-circular cross-section by overlapping and winding a belt-like positive and negative electrode sheet coated with an active material and a belt-like separator sheet made of an insulating material. And
A winding step of winding around a predetermined core in a state where various sheets of the positive and negative electrode sheets and the separator sheet, which are continuously supplied from a roll-shaped raw fabric, are superposed,
After the various sheets are wound around the core for a predetermined length, a sheet cutting step of cutting the various sheets at a position that becomes a separation on the terminal side of the wound various sheets;
At least before unwinding the unrolled portion of the various sheets on the core, tape affixing is performed to attach a winding tape to the terminal end portion of the sheet located on the outermost peripheral side of the core. Process,
In a state where the various sheets are pressed by a predetermined pressing roller provided rotatably, a winding step of winding the unwinding portion of the various sheets around the core;
A winding element manufacturing method comprising: a winding step of pressing and sticking the winding tape against the circumferential surface of the winding element by the pressing roller.

  According to the means 7, the same effect as the means 1 can be obtained.

  Means 8. In the sheet cutting step, the first cutting step of cutting the sheet located on the outermost periphery side of the core cuts at least a sheet (for example, a separator sheet) positioned second from the outermost periphery side of the core. The method for manufacturing a wound element according to the means 7, which is performed in a stage prior to the second cutting step.

  According to the means 8, the tape applying process, the outermost sheet positioning process performed in the preceding stage, and the like can be smoothly performed without being obstructed by other sheets. As a result, the same effect as the said means 5 is show | played.

It is a cross-sectional schematic diagram which shows the structure of a battery element. It is a schematic block diagram of the winding apparatus which shows the state after an electrode sheet cutting | disconnection. It is a schematic block diagram of the winding apparatus which shows the state in which the turret is rotating. It is a schematic block diagram of the winding apparatus which shows the state which started supply of the new electrode sheet. It is a schematic block diagram of the winding apparatus which shows the state which rotation of the turret stopped. It is a schematic block diagram of the winding apparatus which shows the state at the time of a separator sheet cutting | disconnection. It is a schematic block diagram of the winding apparatus which shows the state which started the winding of various sheets newly. It is a schematic diagram which shows schematic structures, such as a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. It is operation | movement explanatory drawing of a pressing roller, a clamping mechanism, and a tape sticking mechanism. (A) is a schematic diagram for demonstrating the conventional tape sticking operation | work with respect to the winding element of circular cross section, (b) is for demonstrating the tape sticking operation | work with respect to the non-circular winding element. It is a schematic diagram.

  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 apparatus of this embodiment is demonstrated.

  As shown in FIG. 1, a lithium ion battery element 1 (hereinafter simply referred to as “battery element 1”) is formed by stacking a positive electrode sheet 4 and a negative electrode sheet 5 via two separator sheets 2 and 3. Manufactured by being wound in a state.

  In FIG. 1, for convenience of explanation, the battery element 1 is shown in a state of being wound in a circular cross section, and separator sheets 2 and 3 and electrode sheets 4 and 5 (hereinafter, these are referred to as “various sheets”. 2-5 ").

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

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

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

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

  Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 2 and the like, the winding device 10 includes a winding unit 11 for winding various sheets 2 to 5 and a positive electrode sheet supply mechanism for supplying the positive electrode sheet 4 to the winding unit 11. 31, a negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding unit 11, and separator sheet supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding unit 11, respectively. I have. Various mechanisms in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61 are controlled by a control device (not shown).

  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 shape, sheet insertion means 33 for supplying the positive electrode sheet 4 to the winding unit 11, A sheet cutting cutter 34 as a sheet cutting means for cutting the electrode sheet 4 and a tension applying mechanism 35 for preventing the positive electrode sheet 4 from slackening are provided.

  The positive electrode sheet original fabric 32 is supported so as to be freely rotatable, and the positive electrode sheet 4 is appropriately pulled out from here.

  The sheet insertion means 33 is configured to be movable along the conveyance path of the positive electrode sheet 4 to an approach position approaching the winding unit 11 and a separation position separating from the winding unit 11. The sheet insertion means 33 includes a pair of chucks 33 a and 33 b that can hold the positive electrode sheet 4. The chucks 33a and 33b are configured to be opened and closed by a driving means (not shown).

  And when supplying the positive electrode sheet 4 to the winding part 11, by holding the positive electrode sheet 4 with the chucks 33a and 33b, the sheet insertion means 33 is brought close to the winding part 11, The starting end portion of the positive electrode sheet 4 can be positioned at a predetermined position corresponding to a winding start position P1 described later.

  The sheet cutting cutter 34 includes a pair of blade portions 34 a and 34 b that are positioned on both the front and back sides of the positive electrode sheet 4. The sheet cutting cutter 34 is movable between a sheet cutting position where the pair of blade portions 34 a and 34 b sandwich the positive electrode sheet 4 and a retreat position where the positive electrode sheet 4 is retracted out of the conveyance path. Is provided.

  When the sheet insertion means 33 moves closer to the winding part 11 side so as to supply the positive electrode sheet 4 to the winding part 11, the sheet insertion means 33 is separated from the transport path of the positive electrode sheet 4. 33 movement is not hindered. The positive electrode sheet 4 is cut while the positive electrode sheet 4 is held by the chucks 33a and 33b.

  The tension applying mechanism 35 includes a pair of rollers 35a and 35b and a dancer roller 35c provided so as to be swingable between the rollers 35a and 35b. The dancer roller 35 c is configured to be able to apply tension to the positive electrode sheet 4, and plays a role of preventing the positive electrode sheet 4 from slackening.

  Similarly to the positive electrode sheet supply mechanism 31, the negative electrode sheet supply mechanism 41 includes a negative electrode sheet original 42, a sheet insertion means 43 (a pair of chucks 43a and 43b), and a sheet cutting cutter 44 (a pair of blades as a sheet cutting means). Sections 44a, 44b), a tension applying mechanism 45 (a pair of rollers 45a, 45b, a dancer roller 45c) and the like. The various configurations of the negative electrode sheet supply mechanism 41, such as the negative electrode sheet original fabric 42, the sheet insertion means 43, the sheet cutting cutter 44, and the tension applying mechanism 45, are the same as those of the positive electrode sheet supply mechanism 31. The detailed explanation is omitted.

  On the other hand, the separator sheet supply mechanism 51 includes a separator sheet original fabric 52 formed by winding the separator sheet 2 in a roll shape, and a tension applying mechanism 55 for preventing the separator sheet 2 from slackening.

  The separator sheet original fabric 52 is supported so as to be freely rotatable, and the separator sheet 2 is appropriately pulled out from here.

  The tension applying mechanism 55 includes a pair of rollers 55a and 55b, and a dancer roller 55c provided so as to be swingable between the rollers 55a and 55b. The dancer roller 55c is configured to be able to apply tension to the separator sheet 2 and plays a role of preventing the separator sheet 2 from slackening.

  Similar to the separator sheet supply mechanism 51, the separator sheet supply mechanism 61 includes a separator sheet original fabric 62, a tension applying mechanism 65 (a pair of rollers 65a and 70a, a dancer roller 65c), and the like. However, of the pair of rollers 65a and 70a, one roller 70a also serves as a guide roller described later.

  Various guide rollers (reference numerals omitted) for guiding the various sheets 2 to 5 such as a pair of guide rollers 70 a and 70 b that collect the various sheets 2 to 5 together are provided in the middle of the conveyance path of the various sheets 2 to 5. It has been.

  Of the pair of guide rollers 70a and 70b, one guide roller 70a on which the separator sheet 3 is hung is constituted by a fixed roller whose rotation axis position does not change. The other guide roller 70b is constituted by a displacement roller that can be displaced to an approach position that approaches one guide roller 70a and a separation position that is separated from the guide roller 70a. Thereby, it is comprised so that the clearance gap between a pair of guide rollers 70a and 70b may change suitably.

  One guide roller 70a is pivotally supported so as to be freely rotatable, and is always in contact with the separator sheet 3. Thereby, the guide roller 70a rotates in accordance with the movement of the separator sheet 3.

  Next, the configuration of the winding unit 11 will be described in detail. As shown in FIG. 2 and the like, the winding unit 11 includes a disc-shaped turret 12 rotatably provided by a driving mechanism (not shown), and three winding cores provided at intervals of 120 ° in the rotation direction of the turret 12. 13A, 13B, and 13C, the cores 13A, 13B, and 13C, and three support rollers 15A, 15B, and 15C provided at positions shifted by a predetermined amount in the rotation direction of the turret 12, respectively, and separator sheets 2 and 3 And a separator sheet cutter 16 as a sheet cutting means for cutting.

  The winding cores 13A, 13B, and 13C are for winding the various sheets 2 to 5 on the outer peripheral side of the winding cores 13A, 13B, and 13C, respectively, and are configured to be rotatable about their own central axes by a driving mechanism (not shown). Further, the winding cores 13A, 13B, and 13C are provided so as to be able to appear and retract with respect to the turret 12 along the axial direction of the turret 12 (the depth direction in FIG. 1 and the like).

  As shown in FIG. 2 and the like, each of the winding cores 13A, 13B, and 13C is composed of a pair of core pieces extending along its own axial direction (the depth direction in FIG. 2). It is comprised so that various sheets 2-5 can be hold | gripped between the core pieces (slit).

  Moreover, each core 13A, 13B, 13C in this embodiment is comprised by the flat shape from which the cross-sectional shape in the orthogonal direction of a rotating shaft becomes a rectangular shape, respectively.

  When the turret 12 rotates, the winding cores 13A, 13B, and 13C have a winding start position P1 as a first position, a winding end position P2 as a second position, and a removal position P3 as a third position. In turn, it is configured to be capable of turning. Accordingly, the function of the control device that controls the turret 12 constitutes the turret control means in the present embodiment.

  The winding start position P1 is a position at which the winding of the various sheets 2 to 5 with respect to the cores 13A, 13B, and 13C is started, and from each of the supply mechanisms 31, 41, 51, 61 toward the winding start position P1. Various sheets 2 to 5 are supplied.

  The winding end position P2 is a position at which winding of the various sheets 2 to 5 with respect to the winding cores 13A, 13B, and 13C is completed, and is a position for performing winding prevention with a winding tape TP (see FIG. 8 and the like). It is.

  In the periphery of the winding end position P2, the pressing roller 78 for preventing the various sheets 2 to 5 taken up by the winding cores 13A, 13B, and 13C from being scattered, and the terminal side are cut to be in a free state. A clamping mechanism 79 for clamping the unwinding portion of the positive electrode sheet 4, a tape applying mechanism 80 as a tape applying means for applying the winding stopper tape TP to the terminal portion of the positive electrode sheet 4, and the like are provided. (See FIG. 8 etc.). 2 to 7, for the sake of convenience, the various mechanisms provided in the periphery of the winding end position P2, such as the pressing roller 78, are not shown. Details of these various mechanisms will be described later.

  The removal position P3 is a position for removing the various sheets 2 to 5 after winding, that is, the completed battery element 1. A removal device (not shown) for removing the battery element 1 from the winding cores 13A, 13B, and 13C is provided in the periphery of the removal position P3.

  The support rollers 15A, 15B, 15C are separator sheets 2, between the cores 13A, 13B, 13C moved to the winding end position P2 and the separator sheet supply mechanisms 51, 61 (a pair of guide rollers 70a, 70b). It is for hooking and supporting 3.

  The separator sheet cutter 16 is disposed in the vicinity of the winding start position P1, and is moved away from the turret 12 and the winding cores 13A, 13B, and 13C. It is configured to be movable to a retracted position that does not hinder the movement.

  The cutting position for cutting the separator sheets 2 and 3 is set downstream of the winding start position P1 and upstream of the winding end position P2 with respect to the longitudinal direction of the separator sheets 2 and 3. .

  Next, the various mechanisms provided in the periphery of the winding end position P2 will be described in detail with reference to FIGS.

  The pressing roller 78 can approach the cores 13A, 13B, and 13C at the winding end position P2 and press various sheets 2 to 5 wound around the cores 13A, 13B, and 13C by driving means (not shown). The holding position is configured to be movable to a retracted position that is separated from the cores 13A, 13B, and 13C and does not hinder the movement of the cores 13A, 13B, and 13C.

  The pressing roller 78 is pivotally supported so as to be freely rotatable and is urged toward the winding cores 13A, 13B, and 13C by the coil spring C1. As a result, the pressing roller 78 can be rotated or displaced following the movement of the various sheets 2 to 5 wound around the winding cores 13A, 13B, and 13C.

  The clamping mechanism 79 includes a pair of clamping rollers 79A and 79B provided so as to be relatively displaceable in the horizontal direction.

  More specifically, of the pair of sandwiching rollers 79A and 79B, one sandwiching roller 79A located on the outer peripheral side of the positive electrode sheet 4 is constituted by a fixed roller whose rotational axis position does not change. Further, the other sandwiching roller 79B located on the inner peripheral side of the positive electrode sheet 4 has an approach position approaching the one sandwiching roller 79A and a separating position separating from the sandwiching roller 79A by a drive mechanism D1 including an air cylinder or the like. It is comprised by the displacement roller which can displace to. When the sandwiching roller 79B approaches the sandwiching roller 79A, the positive electrode sheet 4 in a state in which the terminal side is cut and hangs down in the vertical direction can be sandwiched by the sandwiching rollers 79A and 79B. That is, the pair of sandwiching rollers 79A and 79B can be opened and closed between a closed state in which the positive electrode sheet 4 can be sandwiched and an open state in which the positive electrode sheet 4 cannot be sandwiched.

  Each of the sandwiching rollers 79A and 79B is pivotally supported so as to be freely rotatable, and the sandwiching roller 79B is urged toward the sandwiching roller 79A by a coil spring C2. As a result, each of the sandwiching rollers 79A and 79B can rotate following the movement of the positive electrode sheet 4 wound around the cores 13A, 13B, and 13C in a state where the positive electrode sheet 4 is sandwiched. .

  Further, since the sandwiching roller 79B comes into contact with the adhesive surface of the winding tape TP as will be described later, at least the surface thereof is formed of a material having excellent non-adhesive properties such as a fluororesin such as Teflon (registered trademark). Has been.

  Furthermore, the clamping mechanism 79 includes a mounting table 79C that is movably provided together with a clamping roller 79B that is a displacement roller. The mounting table 79C constitutes the separating means in the present embodiment, and is for mounting the unwinding portions of the separator sheets 2 and 3 and the negative electrode sheet 5 whose end sides are cut as will be described later. is there. Thereby, it is possible to restrict the unwinding portions of the separator sheets 2 and 3 and the negative electrode sheet 5, which are in a free state by cutting the terminal side, from drooping in the vertical direction like the positive electrode sheet 4.

  The tape sticking device 80 includes a suction block 82 as suction means for sucking and holding the unwinding portion of the positive electrode sheet 4 in a state where the terminal side is cut and hangs down in the vertical direction, and the positive block sucked and held by the suction block 82. In order to affix the conveyance lever 83 for conveying the winding tape TP to the terminal portion of the electrode sheet 4 and a part of the winding tape TP conveyed by the conveyance lever 83 to the terminal portion of the positive electrode sheet 4. The clamp mechanism 84 is provided.

  The suction block 82 is provided at the outer peripheral side position of the positive electrode sheet 4 and at the lower position of the sandwiching roller 79A. The adsorption block 82 has a substantially flat plate shape made of a porous body, and is connected to a vacuum hose (not shown) through a suction path (not shown). The suction pump 82 can be switched between suction and release by the vacuum pump being controlled on and off. When the vacuum pump is turned on, the outer peripheral side surface of the positive electrode sheet 4 is sucked and held by the suction block 82.

  The transport lever 83 is pivotally supported at one end portion in the longitudinal direction and has a tape holding portion 83a capable of holding the winding tape TP at the other end portion. More specifically, the transport lever 83 causes the tape holding portion 83a to adhere to the adhesive surface of the winding tape TP supplied in a state of being cut to a predetermined length from a tape supply mechanism (not shown), thereby the winding tape TP. Can be held. Of course, the present invention is not limited to this, and the winding tape TP may be sucked and held by a predetermined sucking means.

  It can be said that the clamp mechanism 84 includes an outer peripheral side clamp 84 </ b> A provided on the outer peripheral side of the positive electrode sheet 4 and an inner peripheral side clamp 84 </ b> B provided on the inner peripheral side of the positive electrode sheet 4.

  The clamps 84A and 84B can be relatively displaced along the horizontal direction between an approach position approaching the positive electrode sheet 4 and a separation position spaced apart from the positive electrode sheet 4 by driving mechanisms D2 and D3 each composed of an air cylinder or the like. Is provided.

  The outer periphery side clamp 84 </ b> A is provided to be displaceable at a position directly below the suction block 82. On the other hand, the inner circumference side clamp 84B is formed such that its vertical width is wider than that of the outer circumference side clamp 84A. The upper side of the inner peripheral side clamp 84B is set to a height position that overlaps with the lower part of the suction block 82, and the lower side is set to a height position that overlaps with the outer peripheral side clamp 84A. Thereby, it is comprised so that the positive electrode sheet | seat 4 can be hold | gripped between the outer periphery side clamp 84A and the inner periphery side clamp 84B, or between the adsorption | suction block 82 and the inner periphery side clamp 84B, respectively.

  Next, a method for manufacturing the battery element 1 using the winding device 10 will be described. In the present embodiment, the second winding is performed at the winding start position P1 from the stage where the winding of the various sheets 2 to 5 for one element is substantially completed on the first core 13A at the winding start position P1. It demonstrates in detail along the process until it starts winding various sheets 2-5 with respect to the core 13B.

  While the winding operation of the various sheets 2 to 5 is being performed by the first winding core 13A, the second winding core 13B, or the third winding core 13C at the winding start position P1, the turret 12 is In a stopped state, the axis positions of the winding cores 13A, 13B, and 13C are fixed at the winding start position P1, the winding end position P2, or the removal position P3.

  When the various sheets 2 to 5 are wound on the first core 13A at the winding start position P1 by a predetermined length, the winding operation by the first core 13A is temporarily stopped. Here, the process in which the various sheets 2 to 5 are wound on the first winding core 13A at the winding start position P1 by a predetermined length corresponds to the winding process in the present embodiment.

  Once the winding operation by the first winding core 13A is stopped, the positive electrode sheet supply mechanism 31 causes the terminal portion of the positive electrode sheet 4 wound around the first winding core 13A and the second winding core 13B to The cutting position that becomes the separation from the starting end of the positive electrode sheet 4 to be wound next time is positioned with respect to the sheet cutting cutter 34 (blade portions 34a and 34b).

  At the same time, in the negative electrode sheet supply mechanism 41, an end portion of the negative electrode sheet 5 wound around the first core 13A, and a start end portion of the negative electrode sheet 5 wound around the second core 13B next time The cutting position that becomes the separation of is positioned with respect to the sheet cutting cutter 44 (blade portions 44a, 44b).

  Subsequently, in the positive electrode sheet supply mechanism 31, the positive electrode sheet 4 is gripped by the sheet insertion means 33 (chucks 33a and 33b), and then the positive electrode sheet 4 by the sheet cutting cutter 34 (blade portions 34a and 34b). Is cut (see FIG. 2).

  At the same time, in the negative electrode sheet supply mechanism 41, the negative electrode sheet 5 is held by the sheet insertion means 43 (chucks 43a and 43b), and then the negative electrode sheet 5 is moved by the sheet cutting cutter 44 (blade portions 44a and 44b). It is cut (see FIG. 2). Here, the step of cutting the electrode sheets 4 and 5 constitutes the sheet cutting step (first cutting step) in the present embodiment.

  When the cutting of the electrode sheets 4 and 5 is completed, the turret 12 starts rotating without cutting the separator sheets 2 and 3.

  As a result, the first core 13A at the winding start position P1 moves to the winding end position P2 while pulling out the separator sheets 2 and 3 from the separator sheet supply mechanisms 51 and 61, and at the removal position. The second core 13B in P3 moves toward the winding start position P1 while being immersed in the turret 12 (see FIG. 3). Further, as will be described later, the third winding 13C in which the winding and the winding of the various sheets 2 to 5 are completed at the winding end position P2, that is, the third winding holding the completed battery element 1 around. The lead 13C moves to the removal position P3.

  Then, the control device operates the sheet insertion means 33 (chucks 33a and 33b) of the positive electrode sheet supply mechanism 31 when a predetermined timing set in advance arrives. As a result, the sheet insertion means 33 holding the positive electrode sheet 4 is moved closer to the guide rollers 70a and 70b, and the starting end portion of the positive electrode sheet 4 is supplied toward the winding portion 11 (winding start position P1). .

  At the same time, the control device operates the sheet inserting means 43 (chucks 43a and 43b) of the negative electrode sheet supply mechanism 41 when a predetermined timing set in advance arrives. As a result, the sheet insertion means 43 holding the negative electrode sheet 5 is moved closer to the guide rollers 70a and 70b, and the starting end portion of the negative electrode sheet 5 is inserted between the separator sheets 2 and 3 (see FIG. 4). .

  Then, when the first winding core 13A, the second winding core 13B, and the third winding core 13C reach the winding end position P2, the winding start position P1, and the removal position P3, respectively, The rotation operation of the first core 13A stops (see FIG. 5).

  In this embodiment, unlike the negative electrode sheet 5, the positive electrode sheet 4 is not sandwiched between the separator sheets 2 and 3. For this reason, from the first winding core 13A that has reached the winding end position P2, the unwinding portion of the positive electrode sheet 4 that has been cut off at the end side and is in a free state is not supported at all, and hangs down in the vertical direction. (See FIG. 8 and the like).

  At the same time as the turret 12 and the first core 13A are stopped, the operation of the sheet insertion means 43 of the negative electrode sheet supply mechanism 41 is stopped. Thereby, movement of both separator sheets 2 and 3 and negative electrode sheet 5 stops. In addition, the sheet of the positive electrode sheet supply mechanism 31 at a predetermined timing (for example, at the same time as when the movement of the separator sheets 2 and 3 and the negative electrode sheet 5 stops, or before or after this timing). The operation of the insertion means 33 is stopped, and the movement of the positive electrode sheet 4 is stopped. Thereby, it will be in the state where the starting end part of both electrode sheets 4 and 5 was positioned in the predetermined position.

  In such a state, the separator sheets 2 and 3 arranged from the first core 13A to the separator sheet supply mechanisms 51 and 61 are caught by the support roller 15A, and between the support roller 15A and the guide rollers 70a and 70b. The separator sheets 2 and 3 are stretched straight.

  On the other hand, in the initial state where the second core 13B immersed in the turret 12 has reached the winding start position P1, the separator sheets 2, 3 disposed between the support roller 15A and the guide rollers 70a, 70b. The longitudinal direction of (various sheets 2 to 5) and the penetrating direction between the pair of core pieces (slits) of the second winding core 13B are substantially parallel.

  In this state, the second core 13B protrudes from the turret 12. Thereby, it will be in the state where various sheets 2-5 were inserted between the core pieces of the 2nd core 13B. In FIG. 5, for convenience of explanation, the guide rollers 70a and 70b are spaced apart from each other and the various sheets 2 to 5 are spaced apart from each other. However, at this stage, the guide roller 70b approaches the guide roller 70a. The various sheets 2 to 5 are sandwiched between the guide rollers 70a and 70b so as to be easily inserted between the core pieces of the second winding core 13B.

  When various sheets 2 to 5 are inserted between the core pieces of the second core 13B, the start ends of the electrode sheets 4 and 5 are positioned between the core pieces of the second core 13B. . Then, the chuck mechanism 17 of the second core 13B is operated to grip the various sheets 2-5.

  When the various sheets 2 to 5 are gripped by the second core 13 </ b> B, in the positive electrode sheet supply mechanism 31, the sheet insertion unit 33 (chucks 33 a and 33 b) is in an open state, and is more positive than gripping by the sheet insertion unit 33. The electrode sheet 4 is released. In the negative electrode sheet supply mechanism 41, the sheet insertion means 43 (chucks 43 a and 43 b) is opened, and the negative electrode sheet 5 is released by gripping by the sheet insertion means 43.

  On the other hand, at the winding end position P2, the various sheets 2 to 5 wound around the first core 13A are pressed by the pressing roller 78 (see FIG. 8). At the same time, at the winding end position P2, a tape application operation is performed in which the winding tape TP is applied in advance to the terminal portion of the positive electrode sheet 4. Details of the tape application work will be described later.

  In this way, when the separator sheets 2 and 3 are fixed to the first core 13A at the winding end position P2 and the second core 13B at the winding start position P1, respectively, the separator sheet cutter 16 is fixed. The separator sheets 2 and 3 are cut between the two cores 13A and 13B (in the vicinity of the second core 13B) (see FIG. 6). Here, the process of cutting the separator sheets 2 and 3 constitutes the sheet cutting process (second cutting process) in the present embodiment.

  After the separator sheets 2 and 3 are cut, at the winding start position P1, the second core 13B is rotated, and the winding operation of the various sheets 2 to 5 gripped by the second core 13B is started. That is, the winding of new various sheets 2 to 5 is started at the winding start position P1 (see FIG. 7).

  At the same time, in the positive electrode sheet supply mechanism 31, the sheet insertion means 33 (chucks 33a and 33b) moves away from the winding unit 11 and returns to the original position. In the negative electrode sheet supply mechanism 41, the sheet insertion means 43 (chucks 43a and 43b) moves away from the winding unit 11 and returns to the original position.

  Further, at the winding end position P2, the unwinding portions of the various sheets 2 to 5 are wound by the first winding core 13A, and the winding is stopped by the winding tape TP. Thereby, the winding operation | work of the various sheets 2-5 is completed, and the battery element 1 is completed. The details of the above-described winding work will be described later.

  Further, at the removal position P3, the third core 13C in which the various sheets 2 to 5 have been wound and fastened at the winding end position P2 first, that is, the third battery element 1 that has completed the battery element 1 is held around. The completed battery element 1 is removed from the winding core 13C by the above-described removal device. After the battery element 1 is removed, the third core 13 </ b> C is immersed in the turret 12.

  Thereafter, the above-described steps are repeatedly performed, and the battery elements 1 are sequentially manufactured by sequentially winding the various sheets 2 to 5 around the cores 13A, 13B, and 13C.

  Here, the tape applying operation and the winding operation will be described in detail with reference to FIGS.

  As described above, when the winding core 13A (13B, 13C) that has moved from the winding start position P1 reaches the winding end position P2 and stops, the unwinding of the positive electrode sheet 4 in which the terminal side is cut and becomes free is left. The part hangs down in the vertical direction from the core 13A (13B, 13C) (see FIG. 8).

  At this stage, since the separator sheets 2 and 3 are not yet cut, the separator sheets 2 and 3 and the negative electrode sheet 5 sandwiched between them do not hang down like the positive electrode sheet 4.

  Subsequently, the sandwiching roller 79B is driven, and the positive electrode sheet 4 hanging vertically from the winding core 13A (13B, 13C) is sandwiched by the pair of sandwiching rollers 79A and 79B (see FIG. 9). At the same time, the suction block 82 is operated to suck the positive electrode sheet 4.

  Thereafter, when the separator sheets 2 and 3 are cut by the separator sheet cutter 16 as described above, the unrolled portions of the separator sheets 2 and 3 and the negative electrode sheet 5 that have become free are placed on the placing table 79C. (See FIG. 10).

  Next, the winding core 13A (13B, 13C) is slightly rotated to wind up the position of the terminal portion of the positive electrode sheet 4 to a predetermined tape application position (see FIG. 11).

  In this embodiment, when it is determined that the position of the terminal portion of the positive electrode sheet 4 has reached a predetermined tape application position based on the value of an encoder (not shown) provided on the core 13A (13B, 13C), the core The terminal portion of the positive electrode sheet 4 is positioned by stopping the winding operation by 13A (13B, 13C). Of course, the present invention is not limited to this, and for example, the end portion of the positive electrode sheet 4 may be detected by a predetermined sensor, and the position of the end portion of the positive electrode sheet 4 may be aligned based on this.

  When the terminal portion of the positive electrode sheet 4 is aligned, the inner peripheral side clamp 84B is operated, and the positive electrode sheet 4 is held between the upper part of the inner peripheral side clamp 84B and the lower part of the suction block 82 (FIG. 12). reference).

  Thereafter, the transport lever 83 holding the winding tape TP supplied in advance from the tape supply mechanism is rotated, and is wound up to the end portion of the positive electrode sheet 4 positioned and fixed by the inner peripheral side clamp 84B and the suction block 82. The tape TP is conveyed (see FIG. 13).

  When the winding tape TP is positioned, the outer peripheral side clamp 84A is driven, and the positive electrode sheet 4 is sandwiched between the outer peripheral side clamp 84A and the lower part of the inner peripheral side clamp 84B (see FIG. 14). As a result, the upper adhesive surface of the winding tape TP is pressed against the positive electrode sheet 4. As a result, the winding tape TP is affixed to the terminal portion of the positive electrode sheet 4. Here, the adhesive surface of the lower part of the winding tape TP protruding from the end portion of the positive electrode sheet 4 faces the inner peripheral side of the positive electrode sheet 4. Note that the step of applying the winding tape TP to the end portion of the positive electrode sheet 4 constitutes the tape applying step in the present embodiment.

  After the application of the winding tape TP is completed, the transport lever 83 is further rotated, and the tape holding portion 83a is peeled off from the adhesive surface of the winding tape TP. After the tape holding portion 83a is peeled off, the clamps 84A and 84B are separated from the positive electrode sheet 4 (see FIG. 15).

  Thereafter, the core 13A (13B, 13C) is rotated again while the various sheets 2 to 5 are pressed by the pressing roller 78, and the unwinding portions of the various sheets 2 to 5 are wound. As a result, the unwinding portions of the various sheets 2 to 5 are completely wound up without being unwound (winding step), and the terminal portion of the outermost positive electrode sheet 4 is wound with the winding tape TP (winding). The stopping step), the battery element 1 is completed (see FIG. 16).

  At this time, the unwinding portion of the positive electrode sheet 4 is sandwiched between the pair of sandwiching rollers 79A and 79B, and is applied with a predetermined tension and slides on the surface of the suction block 82 so as to slide the core 13A (13B , 13C).

  When the battery element 1 is completed, the pressing roller 78 is retracted from the core 13A (13B, 13C). At the same time, the suction block 82 stops the suction operation, and the transport lever 83 returns to the position for receiving the winding stop tape TP from the tape supply mechanism. Further, the sandwiching roller 79B and the inner peripheral side clamp 84B are in a state of being retracted to positions that do not interfere with the unwinding portion of the positive electrode sheet 4 that hangs down next.

  Thereafter, at the winding end position P2, the above-described various processes are sequentially performed, and the tape sticking work and the winding work are repeatedly performed.

  As described above in detail, in the present embodiment, before the unwinding portions of the various sheets 2 to 5 are wound around the core 13A (13B, 13C), the terminal portion of the positive electrode sheet 4 on the outermost periphery side is wound. The winding tape TP is attached to the battery by the pressing roller 78 when the unwinding portions of the various sheets 2 to 5 are wound around the core 13A (13B, 13C) by pasting the winding tape TP in advance. It can be pressed against the peripheral surface of the element 1 and pasted.

  As a result, the end of the positive electrode sheet 4 on the outermost peripheral side is properly wound regardless of the position of the battery element 1 having a non-circular cross-section wound around the core 13A (13B, 13C). Tape TP can be attached. That is, regardless of the shape of the battery element 1, even if the battery element 1 has a non-circular cross section, the difference in the type of the battery element 1 to be manufactured (the difference in the lengths of the various sheets 2 to 5 being wound) ), The terminal portion of the positive electrode sheet 4 on the outermost peripheral side can be appropriately wound around the peripheral surface of the battery element 1 by the winding tape TP.

  Furthermore, since it is not necessary to change the operation mode of the tape applying mechanism every time according to the difference in the shape and type of the battery element 1 to be manufactured, it is possible to suppress the complexity of the mechanical structure and operation control. it can. As a result, the operation at the time of switching the production type of the battery element 1 can be simplified, and versatility can be enhanced.

  Moreover, according to this embodiment, various sheets 2-5 are continuously supplied with respect to the core 13A (13B, 13C) from the roll-shaped raw fabric, without cutting the various sheets 2-5 into strips beforehand. Since it is configured to perform the winding operation, it is easy to apply tension necessary for the winding operation and to easily perform meandering regulation. Further, there is no need for a mechanism such as a chuck for gripping the end portions of the various sheets 2 to 5 and a guide rail for guiding the chuck, and it does not take time and effort to set the various strip-shaped sheets 2 to 5 each time. As a result, an increase in the size of the winding device 10 and a decrease in productivity can be suppressed.

  In addition, in this embodiment, the battery element 1 can be taped only by pressing the winding stopper tape TP affixed to the positive electrode sheet 4 in advance by the pressing roller 78. Therefore, when the unwinding portion of the various sheets 2 to 5 is wound around the core 13A (13B, 13C), it is possible to suppress an unnecessary tension from being applied to the various sheets 2 to 5, and winding tightening or the like. The occurrence of problems can be reduced.

  Furthermore, in this embodiment, a pair of 79A and 79B that sandwich the unrolled portion of the positive electrode sheet 4 is provided. As a result, while applying tension to the unwinding portion of the positive electrode sheet 4 and correcting the warp of the unwinding portion of the positive electrode sheet 4, the winding of the unwinding portion of the positive electrode sheet 4 is performed. Work can be done. As a result, wrinkles, slack, meandering, and the like can be suppressed from occurring on the wound positive electrode sheet 4.

  Further, in the present embodiment, the suction block 82 that can suck and hold the unwinding portion of the positive electrode sheet 4 is provided. Thereby, when sticking the winding stopper tape TP to the terminal portion of the positive electrode sheet 4, it is possible to correct or position the warp of the positive electrode sheet 4. As a result, the winding tape TP can be appropriately applied in a good state in which wrinkles, slack, warpage, and the like are not generated on the positive electrode sheet 4.

  In addition, since the unwinding portion of the positive electrode sheet 4 can be stuck between the clamps 84A and 84B in a straight state where the unwinding portion hangs down in the vertical direction, the positive electrode sheet 4 and the unwinding tape It becomes difficult for wrinkles to occur in TP.

  Moreover, in this embodiment, the unwrapped portions of the separator sheets 2 and 3 and the negative electrode sheet 5 that have become free after being cut off at the end side are placed, and a placing table for restricting these from hanging down in the vertical direction 79C. Thereby, the process of sticking the winding tape TP to the terminal portion of the positive electrode sheet 4 on the outermost peripheral side, the positioning process of the terminal portion of the positive electrode sheet 4 performed in the previous stage, etc. , 5 can be performed smoothly without being disturbed. Furthermore, if the length of the other sheets 2, 3, 5 is longer than the length of the positive electrode sheet 4, the winding tape TP affixed to the terminal portion of the positive electrode sheet 4 is replaced with the other sheet 2, Generation | occurrence | production of the malfunction that it sticks to the unwinding part of 3 and 5 and subsequent winding of the various sheets 2-5 cannot be performed appropriately can be suppressed.

  Further, the sandwiching roller 79B according to this embodiment is formed of a material excellent in non-adhesiveness such as a fluororesin at least on the surface thereof. Thereby, when the winding tape TP passes through the sandwiching roller 79B, it is possible to suppress the occurrence of a problem such that the winding tape TP sticks to the sandwiching roller 79B and is peeled off from the positive electrode sheet 4. In addition, there is no need to perform complicated control such as opening and closing operations of the sandwiching rollers 79A and 79B in accordance with the movement of the positive electrode sheet 4 wound around the winding core 13A (13B and 13C), and the winding tape TP The pair of sandwiching rollers 79A and 79B can be maintained in a certain closed state until the toner passes. As a result, since the winding tape TP protruding from the end portion of the positive electrode sheet 4 can be sandwiched, the section where the positive electrode sheet 4 is in a free state can be further reduced.

  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 device 1 of the lithium ion battery is manufactured by the winding device 10, but the winding device manufactured by the winding device 10 is not limited to this. For example, A wound element such as a capacitor or an electrolytic capacitor may be manufactured.

  (B) In the above embodiment, as the cores 13A, 13B, and 13C, flat cores in which the outer peripheral shape (cross-sectional shape in the direction orthogonal to the rotation axis) around which the various sheets 2 to 5 are wound are rectangular are adopted. However, the shape of the cores 13A, 13B, and 13C is not limited to this. For example, a core whose outer peripheral shape (cross-sectional shape) is a circular shape, an elliptical shape, an oval shape, a polygonal shape, or the like is used. It may be adopted.

  Note that the winding device 10 according to the above embodiment is not limited to the shape of the cores 13A, 13B, and 13C being non-circular in cross section, and the winding operation of the electronic element 1 can be performed even when the shape is circular. Since it can be performed, it is highly versatile.

  (C) The material of the separator sheets 2 and 3 and the electrode sheets 4 and 5 is not limited to the said embodiment. For example, in the above embodiment, the separator sheets 2 and 3 are made of PP, but the separator sheets 2 and 3 may be made of other insulating materials.

  (D) In the above embodiment, the case where the battery element 1 of a type that does not have the core is obtained, but the case where the battery element 1 includes the core may be embodied. That is, it is good also as a structure which attaches a core core to core 13A, 13B, 13C, and winds the various sheets 2-5 around the said core core.

  (E) In the above embodiment, the chuck mechanism 17 is provided between the pair of core pieces of each of the cores 13A, 13B, and 13C, and the various sheets 2 to 5 are fixed by the chuck mechanism 17. , 13B, 13C, the configuration of the fixing means for fixing the various sheets 2 to 5 is not limited to this configuration.

  For example, a pair of core pieces of each of the cores 13A, 13B, and 13C can be relatively displaced (opened and closed), and various sheets 2 to 5 are gripped by the pair of core pieces, whereby various sheets are provided to each of the cores 13A, 13B, and 13C. It is good also as a structure which fixes 2-5.

  Moreover, it is good also as a structure which fixes various sheets 2-5 by forming a slit in a rod-shaped winding core and inserting the various sheets 2-5 in the said slit, and rotating a winding core somewhat.

  Moreover, when using a core core as mentioned above, it is good also as a structure which adhere | attaches the separator sheets 2 and 3 with respect to the said core core, and it is good also as a resin-made separator sheet 2 and 3 with respect to a core core. It is good also as a structure which heat-welds.

  (F) In the above embodiment, the turret 12 has three cores 13A, 13B, and 13C. However, the number of cores is not limited to this, and two or four. It is good also as a structure provided with the above winding core. Alternatively, the turret 12 may be omitted, and the winding unit 11 including only one winding core may be provided.

  (G) In the above embodiment, among the various sheets 2 to 5 wound around the cores 13A, 13B, and 13C, the sheet located on the outermost peripheral side is the positive electrode sheet 4, but not limited thereto, The outermost peripheral sheet to which the winding tape TP is attached may be the negative electrode sheet 5 or the separator sheets 2 and 3.

  (H) In the above embodiment, for example, after the electrode sheets 4 and 5 are cut simultaneously, the cores 13A, 13B, and 13C move to the winding end position P2 without cutting the separator sheets 2 and 3, After the separator sheets 2 and 3 are simultaneously cut, the unwinding portions of the electrode sheets 4 and 5 are wound together with the unwinding portions of the separator sheets 2 and 3. The timing which cuts the various sheets 2-5, and the winding procedure of the various sheets 2-5 are not limited to this.

  For example, the positive electrode sheet 4 and the negative electrode sheet 5 may be cut at different timings, or the separator sheets 2 and 3 may be cut at different timings.

  However, the step of attaching the winding tape TP to the terminal portion of the sheet (for example, the positive electrode sheet 4) located on the outermost peripheral side of the winding cores 13A, 13B, 13C, or the terminal portion of the sheet performed in the previous stage In performing the positioning process and the like, the first cutting step of cutting the sheet (for example, the positive electrode sheet 4) positioned on the outermost periphery side of the cores 13A, 13B, and 13C is at least the outermost periphery of the cores 13A, 13B, and 13C. It is preferable to be performed at a stage prior to the second cutting step of cutting the sheet positioned second from the side (for example, the separator sheet 2).

  As for the winding procedure of the various sheets 2 to 5, for example, when the cutting of the electrode sheets 4 and 5 is completed, the winding cores 13A, 13B, and 13C are rotated by a predetermined amount at the winding start position P1, and the separator sheets 2, 3, the unwinding portion of the electrode sheets 4 and 5 is wound up, whereby the winding of the electrode sheets 4 and 5 is completed and the separator sheet 2 (or 3) is placed on the outermost peripheral side of the cores 13A, 13B, and 13C. It is good also as a structure which becomes a sheet | seat located in this, and sticks the winding stop tape TP with respect to the terminal part of the said sheet | seat, and performs a winding stop operation | work.

  (I) The configuration of the pressing roller 78 and the sandwiching rollers 79A and 79B is not limited to the above embodiment. For example, when the unrolled portion of the positive electrode sheet 4 extending from the pressing roller 78 is extremely short, the sandwiching rollers 79A and 79B may be omitted.

  (J) The configuration of the tape applicator 80 (tape applicator) is not limited to the above embodiment.

  For example, in the above embodiment, the suction block 82 that sucks and holds the unwinding portion of the positive electrode sheet 4 is provided. However, for example, when the unwinding portion of the positive electrode sheet 4 is short, the sandwiching rollers 79A and 79B are provided. In the case where only a sufficiently equivalent role is achieved, the suction block 82 (suction means) may be omitted.

  Of course, the configurations of the suction block 82, the transport lever 83, and the clamp mechanism 84 are not limited to the above embodiment. For example, it is good also as a structure provided with the mechanism which has integrally the function of the conveyance lever 83 which can hold | maintain the winding tape TP, and the outer peripheral side clamp 84A which presses the winding tape TP against the positive electrode sheet 4.

  (K) In the above-described embodiment, the unwinding portions of the separator sheets 2 and 3 and the negative electrode sheet 5 that have been cut free at the end side are placed, and the placement for restricting the sagging in the vertical direction is placed. It is the structure provided with the mounting base 79C (separation means).

  Not limited to this, for example, when the lengths of the other sheets 2, 3, 5 are shorter than the length of the positive electrode sheet 4, the winding tape TP attached to the terminal portion of the positive electrode sheet 4 is not It is performed when the trouble such as sticking to the unrolled portions of the sheets 2, 3, 5 is difficult to occur, the step of attaching the winding tape TP to the terminal portion of the positive electrode sheet 4 on the outermost peripheral side, or the previous stage In the case where the positioning step of the terminal portion of the positive electrode sheet 4 can be performed smoothly without being obstructed by the other sheets 2, 3 and 5, the mounting table 79C (separating means) is omitted. Also good.

  Further, as the separating means, a configuration different from the mounting table 79C, such as a chuck capable of gripping the other sheets 2, 3, 5 may be adopted.

  (K) In the above embodiment, the winding tape TP is affixed by the tape affixing device 80 in a state where the unwinding portion of the positive electrode sheet 4 hangs down in the vertical direction. The aspect of the positive electrode sheet 4 to which the TP is attached is not limited to the above embodiment. For example, it is good also as a structure by which the sticking operation | work of the winding stop tape TP is performed in the state in which the unwinding part of the positive electrode sheet 4 was mounted in the horizontal direction.

  DESCRIPTION OF SYMBOLS 1 ... Battery element, 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding device, 11 ... Winding part, 12 ... Turret, 13A, 13B, 13C ... Core, 16 ... separator sheet cutter, 32 ... positive electrode sheet original, 42 ... negative electrode sheet original, 34, 44 ... sheet cutting cutter, 52 ... separator sheet original, 78 ... pressing roller, 79 ... clamping mechanism, 79A, 79B ... Clamping roller, 79C ... mounting table, 80 ... tape attaching mechanism, 82 ... adsorption block, 83 ... conveying lever, 84 ... clamp mechanism, 84A ... outer side clamp, 84B ... inner side clamp, TP ... winding tape, P1 ... Winding start position, P2 ... winding end position, P3 ... removal position.

Claims (8)

A winding device capable of manufacturing a winding element having a non-circular cross section by winding and winding a belt-like positive and negative electrode sheet coated with an active material and a belt-like separator sheet made of an insulating material,
A winding core that can be wound in a state in which various sheets of the positive and negative electrode sheets and the separator sheet that are continuously supplied from a roll-shaped raw material are stacked;
After the various sheets are wound around the core for a predetermined length, a sheet cutting means capable of cutting the various sheets at a position serving as a separation on the terminal side of the wound various sheets;
At least before the unwinding portion of the various sheets is wound on the core, a tape capable of applying a winding tape to the terminal portion of the sheet located on the outermost peripheral side of the core among the various sheets Affixing means;
And a rotatable pressing roller being driven by the movement to be wound of the sheet while pressing the various sheet wound on the winding core,
The winding device, wherein when the unwinding portion of the various sheets is wound around the core, the winding tape can be pressed and pasted onto the circumferential surface of the winding element by the pressing roller.   After the cutting of the outermost sheet and before the unwinding portion of the sheet is wound around the core, the unrolled portion of the sheet is provided so as to be rotatable in accordance with the movement of the sheet. The winding device according to claim 1, further comprising a pair of clamping rollers.   The winding device according to claim 1 or 2, wherein the outermost peripheral sheet is an electrode sheet coated with an active material.   4. The apparatus according to claim 1, further comprising an adsorption unit capable of adsorbing and holding an unrolled portion of the sheet when the winding tape is applied to the outermost peripheral sheet by at least the tape applying unit. 5. The winding device according to any one of the above.   In the stage after the various sheets are cut and before the unwinding portion of the various sheets is wound around the core, the unwinding portion of the outermost sheet of the various sheets, and this The winding device according to any one of claims 1 to 4, further comprising separation means for maintaining the remaining unrolled portions of the other sheets in a separated state. A turret provided so as to be rotatable about its central axis as a rotation axis;
A plurality of the cores arranged at predetermined intervals in the rotation direction of the turret;
After winding the various sheets supplied to the first core in the first position among the plurality of cores for a predetermined length, the turret is rotated to move the first core to the second position. Turret control means for moving and moving a second winding core different from the first winding core to the first position;
After the first core is moved to the second position, the various sheets wound around the first core are pressed by the pressing roller, and the outermost circumferential side is pressed by the tape applying means. The winding according to any one of claims 1 to 5, wherein after the winding tape is applied to the end portion of the sheet, the unwinding portion of the various sheets is wound around the first core. apparatus. This is a method of manufacturing a wound element capable of manufacturing a wound element having a non-circular cross-section by overlapping and winding a belt-like positive and negative electrode sheet coated with an active material and a belt-like separator sheet made of an insulating material. And
A winding step of winding around a predetermined core in a state where various sheets of the positive and negative electrode sheets and the separator sheet, which are continuously supplied from a roll-shaped raw fabric, are superposed,
After the various sheets are wound around the core for a predetermined length, a sheet cutting step of cutting the various sheets at a position that becomes a separation on the terminal side of the wound various sheets;
At least before unwinding the unrolled portion of the various sheets on the core, tape affixing is performed to attach a winding tape to the terminal end portion of the sheet located on the outermost peripheral side of the core. Process,
In a state where the various sheets are pressed by a predetermined pressing roller provided rotatably, a winding step of winding the unwinding portion of the various sheets around the core;
A winding element manufacturing method comprising: a winding step of pressing and sticking the winding tape against the circumferential surface of the winding element by the pressing roller.   In the sheet cutting step, the first cutting step of cutting the sheet positioned on the outermost peripheral side of the core is at least a second cutting step of cutting the sheet positioned second from the outermost peripheral side of the core. The method for manufacturing a wound element according to claim 7, which is also performed in a previous stage.

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