JP4841568B2 - Winding device, winding body manufacturing method and winding system - Google Patents

Description

  The present invention relates to a winding device for obtaining a wound body incorporated in, for example, a secondary battery, a method for manufacturing the wound body, and a winding system.

  For example, a battery element used as a secondary battery such as a lithium ion battery is configured by winding a belt-like body composed of a plus electrode foil, a minus electrode foil, and two separators.

  Conventionally, as a winding device for winding a strip, the electrode foil and the separator are wound around a rotary shaft, and the strip (winding body) wound after winding is removed from the rotary shaft It has been known. However, the winding pressure of the wound body may make it relatively difficult to remove the wound body from the rotating shaft, and may cause damage to the separator and electrode foil during removal. . Furthermore, there exists a possibility that position shift may arise in the electrode foil located in the center part of a wound body, or the edge part of a separator by winding pressure. If such a positional shift occurs, the distance between the electrode foils becomes too large, and as a result, the center portion of the wound body may not be able to fully function as a battery.

Therefore, in order to solve such problems, a cylindrical winding core made of a polymer material or the like is attached to the rotating shaft, and the belt-like body is wound around the winding core, and after winding the belt-like body, A technique for removing the wound body together with the winding core has been proposed (see, for example, Patent Document 1). The technique will be described in detail. First, a cylindrical spline shaft formed of a material having relatively high rigidity is inserted into the through hole of the winding core. Split portions (notches) are formed at both ends of the spline shaft, and a tapered power shaft is inserted into one end of the spline shaft, while a tapered end is formed at the other end of the spline shaft. Is inserted. As a result, both end portions of the spline shaft are spread to the outer peripheral side, the core can be held, and the axis of the core and the axis of the spline shaft can be matched. Further, the spline shaft is provided with a protrusion extending in the longitudinal direction, and the protrusion is fitted into a groove formed in the through hole of the winding core, thereby restricting relative rotation of the winding core with respect to the spline shaft. It has come to be.
Japanese Patent Laid-Open No. 10-144339

  However, in the above technique, since the power shaft and the press inserted at both ends of the spline shaft are tapered at the tip end, due to the difference in pressing force to the power line and the spline shaft side of the press at that time, There are various ways of spreading the both ends of the spline shaft. For this reason, the relative position in the longitudinal direction of the winding core with respect to the spline shaft changes depending on how the both ends of the spline shaft spread, and as a result, the winding position of the belt-like body with respect to the winding core may vary. Further, although means for restricting the relative rotation of the winding core with respect to the spline shaft is provided, no means for restricting relative movement along the longitudinal direction of the winding core with respect to the spline shaft is provided. For this reason, the winding core is displaced in the longitudinal direction during winding of the belt-like body, and as a result, the edge portion in the width direction of the belt-like body may be displaced between the central portion and the outer peripheral portion of the wound body. That is, when the above technique is adopted, there is a possibility that the winding accuracy of the belt-like body is lowered.

  Furthermore, since the power shaft and the press have a tapered shape at the tip, the power shaft and the press are always pressed against the spline shaft in order to keep the winding core in a stable state (applying a pressing force). It is necessary) Here, from the viewpoint of improving the manufacturing efficiency, it is conceivable that the attachment / detachment position for attaching / detaching the winding core to / from the rotating shaft and the winding position for winding the belt-like body around the winding core are different positions. However, it is practically very difficult to move the winding core between both positions while applying a pressing force from the power shaft or the like to the spline shaft. For this reason, when the winding core moves, it is necessary to temporarily release the pressing force, and as a result, there is a possibility that a positional shift along the longitudinal direction of the winding core may occur during the movement. Eventually, it becomes necessary to perform an operation for correcting the misalignment of the core before winding the belt-like body, and there is a concern that the production efficiency may be reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a winding device that can improve the winding accuracy of the belt-like body and improve the production efficiency, and the winding device. It is providing the winding system which uses the manufacturing method of the wound body using this, and the said winding apparatus.

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

Means 1. A winding device for winding a belt-like body around a core core having an insertion hole having a non-circular cross section,
A winding core extending in the axial direction and positioned on one end side in the axial direction;
A core receiver located on the other end side in the axial direction so as to be opposite to the core and located on the same straight line as the axis;
The core is
A base extending in the axial direction;
The core extends from the base toward the other end in the axial direction, is narrower than the base, has a cross-sectional shape corresponding to the cross-sectional shape of the insertion hole of the core, and the core is attached A mounting portion to be
A taper step portion which is located between the base portion and the mounting portion and has a tapered shape toward the other end in the axial direction;
The core receiver is
A support portion supported rotatably about the axis as a rotation axis;
A receiving pin protruding from the support portion toward one end in the axial direction;
A receiving portion provided on an outer peripheral side of the receiving pin, and having a contacted surface with which a contact surface located on the other end side of the both ends of the core core can contact;
The other end side end portion of the mounting portion has a cracked portion, and has a fitting recess capable of fitting the receiving pin on the inner peripheral side thereof,
The winding device according to claim 1, wherein the winding core and the winding core receiver are configured to be able to contact and separate along an axial direction.

  According to the above-described means 1, the mounting portion that is widened to the outer peripheral side by fitting the receiving pin into the fitting recess while bringing one end of the winding core into contact with the taper step portion of the winding core. The other end portion of the core core can be held by the tip portion. As a result, the center axis of the core core and the center axis of the core and the core receiver can be made coincident with each other, and “rattle” of the core core during winding of the strip can be prevented. In addition, since the one end part and the other end part of the core core can be held and the cross-sectional shape of the mounting part corresponds to the cross-sectional shape of the insertion hole of the core core, the core part is attached by the mounting part. It can be supported over substantially the entire area. For this reason, it can suppress effectively that "warp" arises in a core core. In addition, both the cross-sectional shape of the insertion hole of the core and the cross-sectional shape of the mounting portion are non-circular. Thereby, since it can prevent that a core core rotates relatively with respect to a core, it can suppress effectively that "twist" arises in a core core.

  In addition, the one end side end surface of the core core is brought into contact with the taper stepped portion, while the other end side end surface (contact surface) of the core core is brought into contact with the contacted surface of the receiving portion. The relative position in the longitudinal direction of the core core with respect to the core can be more accurately matched. As a result, it is possible to more reliably prevent the occurrence of variations in the winding position of the belt-like body with respect to the core core. In addition, relative movement along the longitudinal direction of the core core with respect to the core can be restricted, and displacement of the core core along the longitudinal direction can also be suppressed.

  As described above, according to the means 1, it is possible to effectively suppress problems such as “warping”, “twisting”, and “rattle” of the core core, and to the core of the core core. The relative position in the longitudinal direction can be adjusted more accurately, and further, the positional deviation along the longitudinal direction of the core can be regulated. Thereby, the winding precision of the strip | belt-shaped body with respect to a core core can be improved greatly.

  Furthermore, according to the present means 1, as described above, the other end portion of the core core can be held by the mounting portion that is spread to the outer peripheral side by fitting the receiving pin. A frictional force is generated between the outer peripheral surface of the receiving pin and the inner peripheral surface (fitting recess) of the mounting portion. Thereby, since it is possible to restrict the relative movement of the winding core receiver in the pulling-out direction (the other end side in the axial direction), when moving the winding core (for example, moving to the winding position of the belt-shaped body) Even if the pressing force is temporarily released, it is possible to effectively suppress the occurrence of displacement in the core core. As a result, it is possible to start winding the belt-like body without correcting the positional deviation of the core core after the movement, thereby improving the production efficiency.

  In addition, when the friction force is generated, the core core is relatively stable even when the pressing force against the core core by the core and the core receiver when the core core is held is relatively small. Can be held in. As a result, it is possible to more reliably suppress deformation of the core core associated with application of excessive pressing force.

  Furthermore, when removing the core core (winding body) around which the belt-like body is wound from the mounting portion, the holding force of the core core by the mounting portion is released by removing the receiving pin from the fitting recess. As a result, the wound body can be removed from the mounting portion relatively smoothly. Thereby, troubles, such as breakage of a core core or a belt-like body, can be prevented and quality improvement of a wound body can be aimed at.

Mean 2. A winding device for winding a strip,
A winding core extending along the axial direction and positioned on one end side in the axial direction;
A core receiver located on the other end side in the axial direction so as to be opposite to the core, and located on the same axis as the axis;
It is attached to the outer periphery of the core, and after winding the strip, it has a wound core and a cylindrical core that is removed from the core.
The core is
A base extending in the axial direction;
A mounting portion that extends from the base portion toward the other end in the axial direction, is narrower than the base portion, has a non-circular cross section, and is attached with the core core,
A taper step portion which is located between the base portion and the mounting portion and has a tapered shape toward the other end in the axial direction;
The core receiver is
A support portion supported rotatably about the axis as a rotation axis;
A receiving pin protruding from the support portion toward the one end side in the axial direction;
A receiving portion provided on the outer peripheral side of the receiving pin,
The core core is
An insertion hole having a cross-sectional shape corresponding to the cross-sectional shape of the mounting portion;
One end side end surface of the receiving portion is a contacted surface on which a contact surface located on the other end side of the both ends of the core core can contact,
The other end portion of the mounting portion has a tip crack portion, and has a fitting recess capable of fitting the receiving pin on the inner peripheral side thereof.
The winding device according to claim 1, wherein the winding core and the winding core receiver are configured to be able to contact and separate along an axial direction.

  According to the means 2, the same effects as the means 1 can be obtained.

  Means 3. The winding device according to claim 1 or 2, further comprising a relative rotation restricting means for restricting relative rotation of the core receiver with respect to the core.

  The “relative rotation restricting means” includes, for example, an engaging protrusion protruding from the tip of the mounting portion, and an engaging recess provided at the tip of the receiving portion and capable of engaging the protrusion. The engaging means etc. which become can be mentioned.

  When the core receiver is slidably rotatable with respect to the core, there is friction between the mounting portion and the receiving pin or between the contact surface of the core and the contacted surface of the receiving portion. May occur. As a result, wear powder is generated, and as a result, the performance of the wound body may be deteriorated.

  In this regard, according to the means 3, the relative rotation of the core receiver with respect to the core can be restricted by the relative rotation restriction means. Thereby, since the core receiver can be driven and rotated with respect to the core, it is possible to suppress the generation of friction between the mounting portion and the receiving pin and to prevent the generation of wear powder. As a result, it is possible to effectively suppress a decrease in the performance of the wound body due to mixing of wear powder and the like.

  Means 4. The winding device according to any one of means 1 to 3, wherein the receiving pin is configured to be able to appear and retract with respect to the support portion.

  According to the said means 4, a receiving pin is comprised so that it can protrude and retract with respect to a support part along an axial direction. Thereby, attachment / detachment of the receiving pin with respect to the fitting recess can be performed more easily, and consequently, the core core can be attached / detached with respect to the mounting portion more easily. As a result, the production efficiency can be further improved.

Means 5. While configuring the inner peripheral surface of the fitting recess or the outer peripheral surface of the receiving pin into a tapered shape that tapers toward one end in the axial direction,
5. The winding device according to claim 4, wherein the amount of protrusion of the receiving pin with respect to the support portion can be adjusted.

  According to the above means 5, the inner peripheral surface of the fitting recess and the outer peripheral surface of the receiving pin are tapered so as to taper toward one end side in the axial direction, and the amount of protrusion / retraction of the receiving pin (insertion amount) can be adjusted. Has been. Thereby, the amount of spread of the mounting portion toward the outer peripheral side can be adjusted relatively easily by adjusting the amount of protrusion and depression of the receiving pin. As a result, various core cores having different inner diameters can be held in a stable state, and the winding accuracy of the belt-like body can be further improved.

  Means 6. Any of means 1 to 5, characterized in that an angle formed by an extension line of the outline of the mounting portion and an outline of the tapered step portion in a cross section including the axis is 20 degrees or more and 70 degrees or less. The winding device described in 1.

  When the angle formed by the extended line of the outer shape of the mounting portion and the outer shape of the tapered step portion in the cross section including the axis (the angle of the tapered step portion) is large (when close to a right angle), the tapered step portion Even if the core is brought into contact with the core, the central axis of the core and the central axis of the core may not be matched. On the other hand, when the angle of the taper step portion is small (close to 0 degree) and the core core is formed of a stretchable material (for example, synthetic resin), one end of the core core There is a possibility that the side end portion exceeds the taper stepped portion, and the “shift” occurs in the longitudinal position of the core core.

  In this respect, according to the means 6, the angle of the tapered step portion is set to 20 degrees or more and 70 degrees or less. Thereby, the central axis of a core core and the central axis of a core can be matched more reliably. In addition, the core core can be more reliably prevented from exceeding the taper step portion, and the longitudinal displacement of the core core can be more reliably prevented.

  The optimum angle of the taper step portion varies depending on the material forming the core core. However, from the viewpoint of corresponding to various core cores made of various materials, the angle of the taper step portion is 30. It is desirable to set it to a degree. Accordingly, the angle of the taper step portion is preferably set to 20 degrees or more and 50 degrees or less, and more preferably 20 degrees or more and 40 degrees or less.

Mean 7 Using the winding device according to any one of the above means 1 to 6, a method for manufacturing a wound body for obtaining a wound body in which the belt-like body is wound around the core core,
Attaching the core to the attachment part;
By bringing the winding core and the winding core receiver closer, the receiving pin is fitted into the fitting recess, and one end side end of the winding core is brought into contact with the tapered step portion, Contacting the contact surface of the core with the contacted surface of the receiving portion;
Winding the strip around the core and removing the receiving pin from the fitting recess, and then removing the core wound around the strip from the mounting portion. The manufacturing method of the wound body characterized by these.

  According to the said means 7, the wound body by which the strip | belt-shaped body was wound with sufficient precision can be obtained comparatively easily.

Means 8. A winding system using a plurality of winding devices according to any one of the above means 1 to 6,
Each of the winding devices is configured to be movable between a winding position for winding the belt-like body and an attachment / detachment position for attaching / detaching the core core.

  According to the means 8, a plurality of winding devices are used, and each winding device is movable between a winding position and an attachment / detachment position. Thus, in at least one winding device, the belt-like body can be wound around the core core, while among the other winding devices, at least one winding device has the core core. It can be attached to and detached from the mounting part. As a result, the production efficiency can be further improved.

  Note that a plurality of attachment / detachment positions and winding positions may be provided. Moreover, it is good also as providing separately the position which replaces with an attachment / detachment position, and the position which mounts a core core, and removes a core core (winding body). In this case, production efficiency can be improved more effectively.

Means 9. When winding the band-shaped body, at least one of the core and the core receiver is configured to apply a pressing force in the axial direction to hold the core.
The winding system according to claim 8, wherein the pressing force is released when each of the winding devices is moved.

  Although the production efficiency can be further improved by using the winding system of the above means 8, as described above, the core core is moved while applying a pressing force from the core to the core core. It is practically very difficult to do. On the other hand, this means 9 uses a winding system that temporarily releases the pressing force when the winding device moves, but even if the pressing force is released in this way, as described above, the fitting recess And since the frictional force has arisen between receiving pins, the position shift of a core core can be suppressed. In other words, under the configuration of the present means 9, the effect obtained by using the winding device such as the above-described means 1 becomes more significant.

  Hereinafter, an embodiment will be described with reference to the drawings.

  First, the structure of the lithium ion battery element as a wound body obtained by the winding device of the present embodiment will be described. As shown in FIG. 4, a lithium ion battery element (hereinafter referred to as “battery element”) 1 has two separators 3, 4, a positive electrode foil 5, and a negative electrode with respect to a cylindrical core 2. A belt-like body 7 constituted by the foil 6 is wound. In FIG. 4, for convenience of explanation, the separators 3, 4, the positive electrode foil 5, and the negative electrode foil 6 are shown spaced apart from each other.

  The winding core 2 is formed of a material having sufficient rigidity (for example, a synthetic resin). Further, the core core 2 has an insertion hole 8 having a non-circular cross section (in this embodiment, a square cross section). In addition, both end surfaces of the core core 2 have a flat surface shape, and one end surface thereof is a contact surface 9 that contacts a contacted surface 35 of a receiving portion 34 to be described later when winding the belt-like body 7. (See FIGS. 2 and 3).

  The separators 3 and 4 have the same width as the length along the longitudinal direction of the core 2 (see FIG. 3), and the different electrode foils 5 and 6 contact each other to cause a short circuit. It is comprised with the insulator (for example, polyethylene etc.) in order to prevent this. In the present embodiment, two separators 3 and 4 are used. However, instead of the two separators 3 and 4, one separator having a central portion bent in two may be used.

  The plus electrode foil 5 and the minus electrode foil 6 also have the same width as the length along the longitudinal direction of the core 2 as in the separators 3 and 4 (see FIG. 3). Further, active materials are applied to both the front and back surfaces of the plus electrode foil 5 and the minus electrode foil 6 (not shown), and ion exchange between the plus electrode foil 5 and the minus electrode foil 6 is performed via this active material. It can be done. More specifically, during charging, ions move from the positive electrode foil 5 side to the negative electrode foil 6 side, and conversely, during discharging, ions move from the negative electrode foil 6 side to the positive electrode foil 5 side. A plurality of positive leads (not shown) extend from one edge in the width direction of the plus electrode foil 5, and a plurality of negative leads (not shown) extend from the other edge in the width direction of the minus electrode foil 6.

  In obtaining a lithium ion battery, the battery element 1 is placed in a cylindrical battery container (not shown) made of metal, 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), the negative electrode lead is also connected to a negative terminal component (not shown), and both terminal components are opened at both ends of the electric container. By providing in, a lithium ion battery can be obtained.

  Next, a wound body manufacturing machine 10 (winding system) having a winding device 11 for manufacturing the battery element 1 will be described. As shown in FIG. 1, the wound body manufacturing machine 10 includes a winding device 11 that is a feature of the present invention, a turret 12 including the winding device 11, and a core core 2 to be described later at an attachment / detachment position P <b> 1. An attachment / detachment device 13 for attaching and removing the battery element 1 and a belt-like body supply mechanism for feeding the belt-like body 7 to the winding position P2 where the belt-like body 7 is wound around the core core 2 ( (Not shown).

  In the present embodiment, a plurality of (two in the present embodiment) winding devices 11 are provided with the center point of the circular turret 12 symmetrical. More specifically, the turret 12 is configured such that two disk-shaped tables 14 and 15 face each other, and the winding device 11 is disposed between the tables 14 and 15. Yes. Both tables 14 and 15 are configured to rotate clockwise (in the direction of the white arrow in the figure), and both tables 14 and 15 are set to rotate synchronously. Thereby, the winding device 11 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 °.

  Next, the winding device 11 will be described in detail. As shown in FIGS. 2 and 3, the winding device 11 extends in the axis C direction, 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 core 21 is made of a predetermined metal material (for example, SKD tool steel) and has a rod shape as a whole. The winding core 21 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 a tapered step portion formed between the base portion 22 and the mounting portion 23. 24. 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 rotating means (for example, a motor) (not shown), and as a result, the entire core 21 is relative to the axis C as the rotation axis. It is rotatable (that is, the rotating means functions as a winding power when winding the belt-like body 7). In the present embodiment, the outer diameter of the base 22 is configured to be the same as the outer diameter of the core core 2. The outer diameter of the base 22 may be configured to be smaller than the outer diameter of the core core 2.

  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 26 that extends in the direction of the axis C and can be fitted with a receiving pin 33 described later is formed on the inner peripheral portion of the tip crack 25, and the inner peripheral surface of the fitting recess 26 Is configured to be substantially parallel to the axis C.

  The taper step portion 24 has a tapered shape toward the other end side in the axis C direction. In addition, an angle α (hereinafter, referred to as “angle α of the taper step portion 24”) formed by the outline GS of the taper step portion 24 and the extension line KS of the outer shape line of the mounting portion 23 in the cross section including the axis C. It is set to 20 degrees or more and 70 degrees or less (in this embodiment, 30 degrees).

  The core receiver 31 is made of a predetermined metal material (for example, SUS) and has a T-shaped cross section. The core receiver 31 is formed of a columnar support portion 32, a receiving pin 33 that is formed integrally with the support portion 32, 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 inside 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 26. In addition, the receiving pin 33 has a tapered shape at the tip thereof in order to make the fitting into the fitting recess 26 easier.

  The receiving portion 34 has an outer diameter substantially equal to the outer diameter of the core core 2, and the end surface of the receiving portion 34 is capable of contacting with one end surface (contact surface 9) of the core core 2. It is a contact surface 35. Here, the abutted surface 35 has a function as a reference surface for determining the mounting position of the core 2 with respect to the mounting portion 23. An annular space between the receiving portion 34 and the receiving pin 33 is a receiving recess 36 that can receive the tip of the mounting portion 23, and the receiving pin 33 is fitted into the fitting recess 26. In this case, the tip of the mounting portion 23 is accommodated in the accommodating recess 36. The outer diameter of the receiving portion 34 may be configured to be smaller than the outer diameter of the core core 2.

  Next, a method for manufacturing the battery element 1 using the wound body manufacturing machine 10 (winding system) having the winding device 11 described above will be described.

  First, by rotating the turret 12 clockwise, one winding device 11 is moved to the attachment / detachment position P1 (at this time, the other winding device 11 is positioned at the winding position P2). At this time, the core 21 and the core receiver 31 are in a state of being separated from each other.

  Next, the core core 2 is attached to the attachment portion 23 by the attachment / detachment device 13. 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 recess 26 and the receiving portion 34 is accommodated. The tip of the mounting portion 23 is inserted into the recess 36. 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. Further, the contact surface 9 of the core core 2 contacts the contacted surface 35 of the receiving portion 34.

  In addition, since a frictional force is generated between the receiving pin 33 and the fitting recess 26, the relative movement of the core receiver 31 in the direction away from the core 21 is restricted. Thereby, the movement of the core core 2 in the removal direction can be sufficiently suppressed. However, in the present embodiment, the winding means 21 winds from the core 21 except when the core core 2 described below is moved. A relatively small pressing force is applied to the core receiver 31 side. As a result, the movement of the core core 2 in the removal direction is more reliably suppressed.

  Next, by rotating the turret 12 clockwise by 180 °, the winding device 11 to which the core core 2 is attached is rotated and moved to the winding position P2. In addition, when the said core core 2 moves, as mentioned above, the pressing force from the said core 21 will be cancelled | released temporarily. This is because it is relatively difficult to apply a pressing force from the core 21 to the core receiver 31 side while moving the core 2 because of the mechanical structure.

  At the winding position P2, the belt-like body 7 supplied from the belt-like body supply mechanism is wound around the moved core core 2. More specifically, after the end of the separator 3 (4) is thermally welded to the core core 2, the core core 2 is rotated by the rotating means, so that the belt-shaped body is formed with respect to the core core 2. 7 is wound.

  After the winding of the belt-like body 7, the turret 12 is rotated clockwise to move the winding core 2 wound with the belt-like body 7 again to the attachment / detachment position P1. Then, the core 21 is relatively moved in a direction away from the core receiver 31, and the receiving pin 33 is removed from the fitting recess 26. Thereby, the holding force of the core core 2 by the mounting part 23 will be cancelled | 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.

  In addition, when the core core 2 is attached / detached in one winding device 11, the belt-like body 7 is wound in the other winding device 11, and the one winding device is also wound. When the belt-like body 7 is wound at 11, the core core 2 is attached to and detached from the other winding device 11.

  As described above in detail, according to the winding device 11 of the present embodiment, the one end portion of the core core 2 is brought into contact with the tapered step portion 24 of the core 21 while the fitting recess 26 is brought into contact with the fitting recess 26. The other end portion of the core core 2 can be held by the distal end portion of the mounting portion 23 that is pushed and widened by fitting the receiving pin 33. As a result, the central axis of the core core 2 coincides with the central axes of the core 21 and the core receiver 31, thereby preventing “rattle” of the core 2 at the time of winding the strip 7. be able to. In addition, since the one end portion and the other end portion of the core core 2 can be held, and the cross-sectional shape of the mounting portion 23 is configured to correspond to the cross-sectional shape of the insertion hole 8 of the core core 2, the mounting portion 23. Thus, the core core 2 can be supported over substantially the entire area. For this reason, it is possible to effectively suppress the occurrence of “warping” in the core core 2. In addition, the cross-sectional shape of the insertion hole 8 of the core core 2 and the cross-sectional shape of the mounting portion 23 are both noncircular. Thereby, it is possible to prevent the core core 2 from rotating relative to the core 21, and to effectively prevent “twist” from occurring in the core core 2.

  In addition, the one end side end surface of the core core 2 is brought into contact with the taper stepped portion 24, while the other end side end surface (contact surface 9) of the core core 2 is brought into contact with the contacted surface 35 of the receiving portion 34. Can be touched. For this reason, the relative position in the longitudinal direction of the core core 2 with respect to the core 21 can be more accurately matched, and the occurrence of variations in the winding position of the strip 7 with respect to the core 2 can be more reliably prevented. can do. In addition, since the relative movement along the longitudinal direction of the core core 2 with respect to the core 21 can also be restricted, the positional deviation along the longitudinal direction of the core core 2 can also be suppressed.

  As described above, according to the present embodiment, problems such as “warping”, “twisting”, and “rattle” of the core core 2 can be effectively suppressed, and the winding of the core core 2 can be effectively suppressed. The relative position along the longitudinal direction with respect to the core 21 can be more accurately matched, and further, the positional deviation along the longitudinal direction of the core core 2 can be regulated. Thereby, the winding precision of the strip | belt-shaped body 7 with respect to the core core 2 can be improved greatly.

  Further, the other end portion of the core 2 can be held by the mounting portion 23 that is widened to the outer peripheral side by fitting the receiving pin 33. A frictional force is generated between the inner peripheral surface of the crack portion 25 (the fitting recess 26). Thereby, since the relative movement to the removal direction (the other end side of the axis C direction) of the core receiver 31 can be regulated, when the core core 2 is moved (for example, moved to the winding position P2), Even if the pressing force is temporarily released, it is possible to effectively suppress the displacement of the relative position of the core 2 due to the frictional force. As a result, the winding of the belt-like body 7 can be started without correcting the misalignment of the core core 2 after the movement, and the production efficiency can be improved.

  Moreover, even if the pressing force with respect to the core core 2 by the core 21 etc. at the time of hold | maintaining the core core 2 is comparatively small by the said frictional force producing, the core core 2 was comparatively stabilized. Can be held in a state. As a result, it is possible to more reliably suppress deformation or the like of the core 2 due to excessive pressing force being applied.

  Furthermore, when removing the battery element 1 from the mounting portion 23, the holding force of the core 2 by the mounting portion 23 is released by removing the receiving pin 33 from the fitting recess 26. It can be removed from the mounting portion 23 relatively smoothly. Thereby, troubles, such as breakage of the core core 2 and the strip | belt-shaped body 7, can be prevented, and the quality improvement of the battery element 1 can be aimed at.

  In addition, the angle α of the tapered step portion 24 is set to 20 degrees or more and 70 degrees or less. Thereby, the central axis of the core core 2 and the central axis of the core 21 can be matched more reliably. In addition, it is possible to more reliably prevent the core core 2 from exceeding the taper stepped portion 24, and it is possible to more reliably prevent the displacement of the core core 2 in the longitudinal direction.

  In addition, the wound body manufacturing machine 10 includes a plurality of winding devices 11, and each winding device 11 is movable between the attachment / detachment position P1 and the winding position P2. Thereby, in one winding device 11, the belt-like body 7 can be wound around the core core 2, while in the other winding device 11, the core core 2 is attached to the mounting portion 23. Can be attached and detached. As a result, the production efficiency can be further improved.

  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 core receiver 31 is in contact with the core 21 on the flat peripheral surface. However, the relative rotation that restricts the relative rotation of the core receiver 31 with respect to the core 21 is described. It is good also as providing a control means. Specifically, as the relative rotation restricting means, as shown in FIG. 5A, the engaging pin 41 protruding from the receiving portion 34 of the core receiver 31 toward the other end side in the axis C direction, and the core core 2. It is good also as providing the engagement means which consists of the engagement recessed part (not shown) which is provided in the contact surface 9 of this, and can engage the said engagement pin 41. FIG. Further, as shown in FIG. 5B, the inner periphery shape of the receiving portion 34 (the outer periphery shape of the housing recess 36) is made to correspond to the cross-sectional shape of the mounting portion 23 having a non-circular shape, whereby the winding around the core 21 is performed. The relative rotation of the core receiver 31 may be restricted. In this case, since the core receiver 31 can be driven and rotated with respect to the core 21, friction between the mounting portion 23 and the fitting recess 26 and between the core core 2 and the receiving portion 34 is prevented. Occurrence can be prevented. As a result, since generation | occurrence | production of abrasion powder can be prevented, the performance fall of the battery element 1 resulting from mixing of abrasion powder can be suppressed effectively.

  (B) In the above embodiment, the insertion core 8 of the core core 2 has a square cross section, and the mounting portion 23 has a square cross section, whereby the core core with respect to the core 21 (the mounting portion 23) is formed. However, the cross-sectional shapes of the insertion hole 8 and the mounting portion 23 of the core core 2 are not limited to a square cross section. That is, any non-circular cross-sectional shape that can regulate the relative rotation of the core 2 with respect to the mounting portion 23 may be used.

  (C) In the above embodiment, the receiving pin 33 is formed integrally with the support portion 32. However, as shown in FIG. 6, the receiving pin 33 is provided separately from the support portion 32, and the receiving pin 33 is provided. The support portion 32 may be configured to be movable (in / out) along the axis C direction. In this case, the receiving pin 33 can be attached to and detached from the fitting recess 26 more easily, and as a result, the winding core 2 can be attached to and detached from the mounting portion 23 more easily. As a result, the production efficiency can be further improved. In addition, it is good also as providing the control means which can adjust the amount of protrusion of the receiving pin 33 with respect to the support part 32. As shown in FIG.

  (D) In the above embodiment, the inner peripheral surface of the fitting recess 26 and the outer peripheral surface of the receiving pin 33 are configured to be substantially parallel to the axis C, as shown in FIGS. 7 (a) and 7 (b). As described above, the inner peripheral surface of the fitting recess 26 and the outer peripheral surface of the receiving pin 33 may be configured in a tapered shape that tapers toward one end side in the axis C direction. In this case, by changing the amount of insertion of the receiving pin 33 with respect to the fitting recess 26, the amount of spread of the mounting portion 23 toward the outer peripheral side can be adjusted. Thereby, the various core cores 2 with different inner diameters can be held in a stable state. In addition, by using the means (c) together, it is possible to adjust the spread amount of the mounting portion 23 to the outer peripheral side more easily.

  (E) In the above embodiment, the length of the core core 2 in the longitudinal direction and the widths of the separators 3 and 4 and the electrode foils 5 and 6 (the width of the strip 7) are the same. On the other hand, as shown in FIG. 8, a belt-like body 7 wider than the length in the longitudinal direction of the core core 2 may be wound around the core core 2. At this time, the outer diameter of the core core 2 and the outer diameter of the base portion 22 and the receiving portion 34 are the same as the outer diameter of the core core 2 or smaller than the outer diameter of the core core 2. Further, it is possible to more reliably prevent the occurrence of “deviation” at the edge in the width direction of the band-like body 7 (that is, the portion protruding from the core core 2). Thereby, the winding precision of the strip | belt shaped object 7 can be improved further.

  (F) In the above embodiment, the core core 2 is formed of a synthetic resin, but the material forming the core core 2 is not particularly limited. Therefore, the core core 2 may be formed of a metal such as aluminum.

  (G) In the said embodiment, although the separator 3 (4) is heat-welded with respect to the core core 2, it may replace with heat welding and may adhere | attach with an adhesive agent or an adhesive tape.

  (H) In the above embodiment, the angle α of the taper step portion 24 is set to 20 degrees or more and 70 degrees or less, but the angle of the taper step portion 24 is not limited to the above range.

  (I) In the above embodiment, the outer diameter of the base portion 22 and the outer diameter of the receiving portion 34 are configured to be the same as the outer diameter of the core core 2 or smaller than the outer diameter of the core core 2. However, it may be configured to have a larger diameter than the outer diameter of the core 2.

  (J) In the above embodiment, the receiving recess 34 is provided with the receiving recess 36, but a configuration in which the receiving recess 36 is not provided may be adopted.

  (K) In the above embodiment, the battery element 1 of the lithium ion battery is manufactured by the winding device 11, but the wound body manufactured by the winding device 11 is not limited to this, for example, Alternatively, an electrolytic capacitor element or the like may be manufactured.

It is a front schematic diagram which shows the wound body manufacturing machine in this embodiment. It is a perspective view which shows the winding apparatus in this embodiment. It is sectional drawing which shows the winding apparatus etc. in this embodiment. It is a cross-sectional schematic diagram for showing the structure of a battery element. (A), (b) is a partial expansion perspective view which shows an example of a relative rotation control means. It is a partial expanded sectional view which shows the support part and receiving pin in another embodiment. (A), (b) is a partial expanded sectional view which shows the shape of the fitting recessed part and receiving pin in another embodiment. It is sectional drawing which shows the winding state of the strip | belt-shaped body to the winding apparatus in another embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Battery element as a winding body, 2 ... Core core, 7 ... Band-shaped body, 8 ... Insertion hole, 9 ... Contact surface, 10 ... Winding body manufacturing machine as winding system, 11 ... Winding apparatus , 21 ... core, 22 ... base, 23 ... mounting part, 24 ... taper step part, 25 ... tip crack part, 26 ... fitting concave part, 31 ... core receiver, 32 ... support part, 33 ... receiving pin, 34 ... receiving part, 35 ... contacted surface, C ... axis, P1 ... attachment / detachment position, P2 ... winding position.

Claims (9)

A winding device for winding a belt-like body around a core core having an insertion hole having a non-circular cross section,
A winding core extending in the axial direction and positioned on one end side in the axial direction;
A core receiver located on the other end side in the axial direction so as to be opposite to the core and located on the same straight line as the axis;
The core is
A base extending in the axial direction;
The core extends from the base toward the other end in the axial direction, is narrower than the base, has a cross-sectional shape corresponding to the cross-sectional shape of the insertion hole of the core, and the core is attached A mounting portion to be
A taper step portion which is located between the base portion and the mounting portion and has a tapered shape toward the other end in the axial direction;
The core receiver is
A support portion supported rotatably about the axis as a rotation axis;
A receiving pin protruding from the support portion toward one end in the axial direction;
A receiving portion provided on an outer peripheral side of the receiving pin, and having a contacted surface with which a contact surface located on the other end side of the both ends of the core core can contact;
The other end side end portion of the mounting portion has a cracked portion, and has a fitting recess capable of fitting the receiving pin on the inner peripheral side thereof,
The winding device according to claim 1, wherein the winding core and the winding core receiver are configured to be able to contact and separate along an axial direction. A winding device for winding a strip,
A winding core extending along the axial direction and positioned on one end side in the axial direction;
A core receiver located on the other end side in the axial direction so as to be opposite to the core, and located on the same axis as the axis;
It is attached to the outer periphery of the core, and after winding the strip, it has a wound core and a cylindrical core that is removed from the core.
The core is
A base extending in the axial direction;
A mounting portion that extends from the base portion toward the other end in the axial direction, is narrower than the base portion, has a non-circular cross section, and is attached with the core core,
A taper step portion which is located between the base portion and the mounting portion and has a tapered shape toward the other end in the axial direction;
The core receiver is
A support portion supported rotatably about the axis as a rotation axis;
A receiving pin protruding from the support portion toward the one end side in the axial direction;
A receiving portion provided on the outer peripheral side of the receiving pin,
The core core is
An insertion hole having a cross-sectional shape corresponding to the cross-sectional shape of the mounting portion;
One end side end surface of the receiving portion is a contacted surface on which a contact surface located on the other end side of the both ends of the core core can contact,
The other end portion of the mounting portion has a tip crack portion, and has a fitting recess capable of fitting the receiving pin on the inner peripheral side thereof.
The winding device according to claim 1, wherein the winding core and the winding core receiver are configured to be able to contact and separate along an axial direction.   The winding device according to claim 1, further comprising a relative rotation restricting unit that restricts relative rotation of the core receiver with respect to the core.   The winding device according to any one of claims 1 to 3, wherein the receiving pin is configured to be capable of protruding and retracting with respect to the support portion. While configuring the inner peripheral surface of the fitting recess or the outer peripheral surface of the receiving pin into a tapered shape that tapers toward one end in the axial direction,
The winding device according to claim 4, wherein an amount of protrusion of the receiving pin with respect to the support portion can be adjusted.   6. An angle formed by an extension line of the outer shape line of the mounting portion and an outer shape line of the tapered step portion in a cross section including the axis is set to 20 degrees or more and 70 degrees or less. The winding device according to claim 1. A method of manufacturing a wound body for obtaining a wound body in which the belt-like body is wound around the core core using the winding device according to any one of claims 1 to 6. ,
Attaching the core to the attachment part;
By bringing the winding core and the winding core receiver closer, the receiving pin is fitted into the fitting recess, and one end side end of the winding core is brought into contact with the tapered step portion, Contacting the contact surface of the core with the contacted surface of the receiving portion;
Winding the strip around the core and removing the receiving pin from the fitting recess, and then removing the core wound around the strip from the mounting portion. The manufacturing method of the wound body characterized by these. A winding system using a plurality of winding devices according to any one of claims 1 to 6,
Each of the winding devices is configured to be movable between a winding position for winding the belt-like body and an attachment / detachment position for attaching / detaching the core core. When winding the band-shaped body, at least one of the core and the core receiver is configured to apply a pressing force in the axial direction to hold the core.
The winding system according to claim 8, wherein the pressing force is released when each of the winding devices moves.

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