JP5455940B2 - Winding device - Google Patents

Description

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

  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 a problem, a cylindrical core core is attached to the rotating shaft, and the belt-like body is wound around the core core. A technique has been proposed in which a winding element is removed, that is, a winding element composed of a winding core and a strip is used as a battery element.

  By the way, in the above techniques, it is necessary to first fix a separator to the surface of the core core, and then wind up the separator and the electrode foil. As a method for fixing the separator to the surface of the core core, a method in which a separator made of a resin material is pressed against a core core made of a resin material by a heater block and heat-sealed can be considered (for example, see Patent Document 1). ).

JP 2009-224235 A

  However, in the manufacturing process of the winding element, the core core is supported so that both ends thereof are pressed. Therefore, when the length of the core core (separator width) is relatively long, heat welding is performed. When the heater block is pressed in the process, the core core is bent by the pressure, and the central portion in the longitudinal direction of the core core is pulled with respect to the heater block.

  In such a state, a sufficient pressure is not applied from the heater block to the central portion in the longitudinal direction of the core core, and an appropriate welding strength cannot be obtained. On the contrary, in order to make the welding state in the longitudinal center part of the core core appropriate, when the pressing force of the heater block against the core core is increased, the pressure applied to both ends in the longitudinal direction of the core core increases. There is a possibility that the resin material is excessively melted in the portion.

  In this way, when uniform welding is not performed over the entire longitudinal direction of the core core (the entire width direction of the separator) in the welding process, and unevenness occurs in the welding strength, for example, in the subsequent winding process, in the width direction of the separator There is a possibility that problems such as winding is performed in a state where the tension is not uniformly applied to the entire region and the separator is wrinkled. As a result, the winding work may become unstable and the quality may be lowered.

  Of course, such a defect occurs not only in the case where the entire core core is made of a resin material, but also in a metal core core having a resin material such as an adhesive tape on at least a part of the surface. To get.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a winding device that can stably perform a winding operation and can improve the quality of the obtained winding element. It is one.

  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. Rotating means that allows a cylindrical core core having a thermoplastic resin material at least part of its surface to be rotatable about its axis;
Thermal welding means capable of thermally welding a strip separator made of a thermoplastic resin material to the core core;
Electrode foil supply means for supplying the positive electrode foil and the negative electrode foil toward the core core, respectively,
After the separator is thermally welded to the core core, the positive electrode foil and the negative electrode foil are insulated from each other via the separator while rotating the core core based on the operation of the rotating means. A winding device for winding in a state,
The heat welding means includes
A heater block having a heating element inside and made of a heat conductive material,
Drive means for driving the heater block so as to press the separator against the core core;
The said heater block is comprised so that bending deformation is possible along the plane containing the axis line of the said core core at least.

  According to the above means 1, the belt-like separator is thermally welded to the core core by the heat welding means. Then, while the core core is rotated based on the operation of the rotating means, the positive electrode foil and the negative electrode foil are supplied toward the core core by the electrode foil supply means, and are insulated from each other via the separators. It is wound up by. And finally, a winding element is obtained by removing the whole core core.

  Here, when the separator is thermally welded to the core core, the heater block operates so as to press the separator against the core core, so that the core core is bent and deformed by the pressure from the heater block.

  On the other hand, in this means 1, the heater block is configured to be able to bend and deform along a plane including the axis of the core core. For this reason, the heater block is bent and deformed along the core core that is bent and deformed, and the heater block is pressed in a more appropriate state with respect to the entire longitudinal direction of the core core (the entire width direction of the separator). Pressure can be applied. As a result, more uniform welding can be performed throughout the longitudinal direction of the core core.

  Thereby, while performing the subsequent winding operation stably, the quality of the obtained winding element can be improved. Furthermore, there is no need to provide a mechanism or process for supporting the core from the opposite side of the heater block, and the apparatus can be simplified and the production efficiency can be improved.

  The term “thermal welding” may mean that the separator may be welded to the resin core, or may be welded to the core via a resin adhesive tape or the like.

  Mean 2. 2. The winding device according to claim 1, wherein the heater block is configured to be deformable following the bending deformation of the core core.

  It is conceivable that the heater block is fixedly deformed in advance assuming the amount of bending of the core, but the amount of bending of the core is different each time. In some cases, the heater block cannot be pressed. On the other hand, according to the means 2, when the core core is bent, the heater block is deformed following the bending deformation of the core core, so that the function and effect of the means 1 are more reliably achieved. .

  Means 3. The winding device according to means 1 or 2, wherein the heater block has a slit so as to be deformable.

  According to the means 3, the effects of the means 1 and the like can be realized with a relatively simple configuration, and the configuration can be simplified.

Means 4. The heater block is
A pressing surface that presses the separator against the core core is formed along the longitudinal direction of the core core parallel to the axis of the core core, and
The winding device according to claim 3, wherein the slit having a predetermined length is formed in parallel with the pressing surface from both longitudinal ends toward the longitudinal central portion.

  According to the means 4, the slits are formed along the direction parallel to the pressing surface (the direction orthogonal to the pressing direction) at both longitudinal ends of the heater block. Thereby, when pressing a heater block, the longitudinal direction both ends of a heater block (pressing surface) become easy to change. That is, the pressing surface of the heater block easily follows the core core that is deformed by receiving pressure from the heater block and is in a state in which the central portion in the longitudinal direction is pulled. As a result, the effects of the means 1 and the like are more reliably achieved.

  Means 5. The winding device according to means 3 or 4, wherein the slit is formed on the pressing surface side with respect to the heating element.

  By forming the slit, the amount of heat radiation around the slit is increased. For this reason, according to the means 5, the heater block has a slightly high temperature in the longitudinal central portion where the heat transmission distance from the heating element is short, and the longitudinal both ends in the long heat transmission distance are slightly low. As a result, while reducing over-welding at both ends in the longitudinal direction of the core core, an appropriate welding state can be obtained at the center in the longitudinal direction, and the effects of the means 1 and the like can be enhanced.

It is a cross-sectional schematic diagram for showing the structure of the battery element in one Embodiment. It is a front schematic diagram which shows a winding apparatus. It is a perspective view which shows a rotation means etc. It is a figure for demonstrating relations, such as a heater block, a core core, and a rotation means. It is a side view of a heater block. It is a front schematic diagram which shows the winding apparatus in the state which rotated the turret half. (A)-(f) is a cross-sectional schematic diagram which shows the adhering and cutting process of a separator. (A)-(d) is a figure for demonstrating the core core and adhesive tape which concern on this embodiment and another embodiment. It is a front view of the heater block in another embodiment.

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

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

  The winding core 2 is made of a material having sufficient rigidity (for example, aluminum). Further, the core core 2 has an insertion hole 8 having a non-circular cross section (in this embodiment, a square cross section). As the core 2 in the present embodiment, a core having a relatively long length of 100 mm along its longitudinal direction (axial direction) is employed.

  The separators 3 and 4 have the same width as the length along the longitudinal direction of the core 2 and are insulated to prevent different electrode foils 5 and 6 from contacting each other and causing a short circuit. It is comprised by the body, especially the polypropylene (PP) which is a thermoplastic resin raw material in this embodiment.

  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 core 2, like the separators 3 and 4. 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, the winding device 11 for manufacturing the battery element 1 will be described. As shown in FIG. 2, the winding device 11 includes a turret 12 that is rotatably provided. The turret 12 is configured such that two disk-shaped tables 14 and 15 face each other, and the rotation means 20 is symmetric about the centers of the tables 14 and 15 across the tables 14 and 15. Two centers are provided. Both tables 14 and 15 (turret 12) are configured to rotate clockwise and are set so that both tables 14 and 15 rotate synchronously. Thereby, each rotation means 20 can move between the attachment / detachment position P1 and the winding position P2. Note that the tables 14 and 15 may be reversible by 180 °.

  An example of the rotating means 20 will be described with reference to FIGS. 3 and 4. The rotating means 20 is a rotating shaft that extends in the direction of the axis C and protrudes from the table 14 on one end side in the axis C direction toward the table 15 on the other end side. It is comprised from the core 21 and the core receiver 31 extended in the said axis C direction and projecting toward the table 14 of the one end side from the table 15 of the other end side of the axis C direction.

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

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

  The mounting portion 23 is for mounting the core 2 on the outer peripheral portion when the battery element 1 is manufactured. The mounting portion 23 has a bar shape and is formed in a non-circular cross section (in this embodiment, a square cross section) to correspond to the cross sectional shape of the insertion hole 8 of the core core 2. Further, the mounting portion 23 is made thinner than the base portion 22, and a pair of tip crack portions 25 extending in the direction of the axis C are formed on the tip side surface portion of the mounting portion 23. In addition, a fitting recess 26 (see FIG. 4) that extends in the direction of the axis C and can be fitted with a receiving pin 33 described later is formed in the inner peripheral portion of the tip crack 25. The inner peripheral surface of 26 is configured to be substantially parallel to the axis C.

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

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

  The receiving pin 33 has a cylindrical shape and is configured so that most of the outer peripheral surface thereof is substantially parallel to the axis C. The receiving pin 33 is disposed 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. Note that the receiving pin 33 has a tapered shape at the tip thereof so as to facilitate the fitting into the fitting recess 26.

  The receiving portion 34 has an outer diameter that is substantially equal to the outer diameter of the core core 2, and a tip surface thereof serves as a contact surface 35 that can abut one end surface of the core core 2. Yes. An annular space between the receiving portion 34 and the receiving pin 33 is 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.

  In the rotating means 20 configured as described above, the core core 2 is attached to the mounting portion 23 by the attaching / detaching device 13 described later. Then, by moving the base portion 22 relative to the other end side (table 15 side) along the axis C direction, the receiving pin 33 is fitted into the fitting concave portion 26 and the receiving concave portion 36 of the receiving portion 34 is accommodated. On the other hand, the tip of the mounting portion 23 is inserted. At this time, the front end portion of the mounting portion 23 is expanded to the outer peripheral side by the receiving pin 33, and the other end portion of the winding core 2 is held by the mounting portion 23 from the inner peripheral side. At the same time, one end of the core 2 is brought into contact with and held by the tapered stepped portion 24. Furthermore, the contact surface at the other end of the core 2 contacts the contact surface 35 of the receiving portion 34. In this way, the core core 2 is attached to the rotating means 20.

  The description returns to the winding device 11 of FIG. As described above, the two rotating means 20 can be moved between the attachment / detachment position P1 (right position in the figure) and the winding position P2 (left position in the figure) by the rotation of the turret 12. However, in the present embodiment, an attachment / detachment device 13 for attaching a core core 2 (to be described later) and removing the battery element 1 is provided corresponding to the attachment / detachment position P1.

  The winding position P2 is a position for winding the belt-like body 7 around the core core 2, and a belt-like body supply mechanism for supplying the belt-like body 7 corresponding to the winding position P2. Is provided. In FIG. 2, for convenience of explanation, the positive electrode foil supply means 16 and the negative electrode foil supply means 17 are shown in the belt-like body supply mechanism.

  Further, in the present embodiment, separator fixing means 41 is provided corresponding to the winding position P2. The separator fixing means 41 includes an adhesive tape attaching means 42, a heat welding means 43, and a cutting means 44 capable of cutting the separators 3 and 4. The adhesive tape attaching means 42 includes a tape supply means, an attaching roller, and an adhesive roller for attaching an adhesive tape 51 made of the same material (PP in this embodiment) to the surface of the core core 2 as the separators 3 and 4. And a tape cutter for cutting the tape (both not shown). In the present embodiment, the adhesive tape applying means 42 is configured to be able to apply an adhesive tape 51 having a length of exactly one turn to the entire length of the core core 2 [dots in FIG. See the pattern).

  The heat welding means 43 includes a heater block 60 (see FIG. 4). Then, in a state where a predetermined tension is applied to the two separators 3 and 4 extending from the previously wound battery element 1 located at the attachment / detachment position P1, the heater block 60 attaches the separators 3 and 4 to the core core 2. It is configured to be able to be pressed onto. Further, the cutting means 44 is configured to be able to cut two separators 3 and 4 at a time after the heat welding.

  Here, the configuration of the heater block 60 will be described in detail with reference to FIGS.

  The heater block 60 has a main body formed of a long metal plate (aluminum in the present embodiment), and its longitudinal direction (left-right direction in FIG. 4) is the axis C of the rotating means 20 (the axis of the core core 2). Direction). And it is comprised so that the approach / separation operation | movement may be performed with respect to the core 2 along the transversal direction (vertical direction of FIG. 4) orthogonal to the axis C by drive means (not shown), such as a cylinder.

  The heater block 60 is set to have a length of 100 mm along the longitudinal direction corresponding to the length of the core core 2 (the width of the separators 3 and 4).

  An insertion hole 61 having a circular cross section is formed in the heater block 60 along the longitudinal direction. The insertion hole 61 accommodates a cartridge heater 62 as a heating element that is supplied with power from the outside and generates heat.

  A predetermined section in the short-side direction on the core core 2 side (lower side in FIG. 5) of the heater block 60 from the cartridge heater 62 is a thin-walled portion 63 because a part thereof is cut away. A pressing surface 64 that presses the separators 3 and 4 against the core core 2 is formed along the longitudinal direction of the heater block 60 at the end of the thin portion 63 on the core core 2 side. On the pressing surface 64, sawtooth-shaped irregularities (not shown) are formed. The heat of the cartridge heater 62 is transmitted to the separators 3 and 4 (core core 2) through the pressing surface 64.

  Further, in the thin portion 63, a slit 65 having a predetermined length is formed in parallel with the pressing surface 64 from both longitudinal ends of the heater block 60 toward the longitudinal central portion. Thus, the heater block 60 is configured to be able to bend and deform along a plane (the paper surface of FIG. 4) including its own longitudinal direction (axial direction of the core 2).

  Next, a method for manufacturing the battery element 1 using the winding device 11 described above will be described.

  First, by rotating the turret 12 half-clockwise, one rotating means 20 is moved to the attachment / detachment position P1. At this time, the other rotating means 20 is positioned at the winding position P2. For example, in the example shown in FIG. 6, the rotating means 20 that has been positioned at the winding position P <b> 2 and has been almost completely wound up is moved to the attachment / detachment position P <b> 1. On the other hand, the rotating means 20 that has been located at the attachment / detachment position P1 and on which the new core core 2 is mounted is moved to the winding position P2.

  In the rotating means 20 located at the winding position P2, the core core 2 is mounted, but nothing is wound around the core core 2 at the beginning. In this state, first, the adhesive tape 51 made of PP is attached to the surface of the core core 2 by the adhesive tape attaching means 42 as shown in FIGS. As described above, in the present embodiment, the adhesive tape 51 having a length of exactly one round is attached to the entire length of the core core 2 in the longitudinal direction.

  Next, the heat welding means 43 is operated. At this time, a predetermined tension is applied to the two separators 3 and 4 extending from the previously wound battery element 1 located at the attachment / detachment position P1, and in this state, FIG. As shown in (d), when the heater block 60 is moved toward the core core 2, the separators 3 and 4 are pressed against the core core 2 by the pressing surface 64. At this time, the core core 2 is deflected by receiving pressure from the heater block 60, and the central portion in the longitudinal direction of the core core 2 is pulled with respect to the heater block 60. At the same time, on the heater block 60 side, the pressing surface 64 corresponding to the section where the slit 65 is formed is bent and deformed following the bending deformation of the core core 2. As a result, the pressing surface 64 of the heater block 60 is pressed more uniformly against the entire region in the longitudinal direction (the entire region in the width direction of the separators 3 and 4) of the core core 2 that has been bent and deformed.

  And as above-mentioned, since the adhesive tape 51 is affixed on the surface of the core core 2, and since the adhesive tape 51 and the separators 3 and 4 are mutually comprised by the same raw material, they mutually melt | dissolve and heat Welding will be performed. In this example, the adhesive tape 51 and the lower separator 3 are welded, and the upper separator 4 and the lower separator 3 are welded. Thus, the two separators 3 and 4 are fixed to the core core 2 at the same time.

  Thereafter, as shown in FIGS. 7E and 7F, when the cutting means (cutter) 44 is operated, two separators 3 and 4 are cut at a time. At the time of the cutting, the rotating means 20 (core 21) is rotated by a predetermined angle as shown in FIG. Thereby, the separators 3 and 4 will be bent at an acute angle, and by cutting the acute angle part, it is possible to realize a cutting in which the heat-welded part is located at the tip. That is, it is possible to fix the separators 3 and 4 to the core core 2 in a state where the tips of the separators 3 and 4 are neatly aligned.

  Thereafter, in the winding position P2, the rotating means 20 (winding core 21) is rotated. When the predetermined timing arrives, the plus electrode foil supply means 16 and the minus electrode foil supply means 17 are actuated to supply the electrode foils 5 and 6 toward the core core 2. Thereby, the plus electrode foil 5 and the minus electrode foil 6 are wound up in an insulated state through the separators 3 and 4, respectively. When the winding of the belt-like body 7 is almost completed, the rotation means 20 is moved to the attachment / detachment position P1 by rotating the turret 12 halfway clockwise. And the remaining separators 3 and 4 cut | disconnected by the cutting means 44 mentioned above are wound up completely, and winding-up is completed by tape-stopping. Thereafter, the holding force of the core core 2 by the mounting portion 23 is released by moving the core 21 relatively away from the core receiver 31 and removing the receiving pin 33 from the fitting recess. It becomes. 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 the above example, in the case where the battery element 1 previously wound is already present at the attachment / detachment position P1, thermal welding is performed in a state where a predetermined tension is applied to the two separators 3 and 4 extending therefrom. A specific explanation will be given for the case where it is given. On the other hand, even when the battery element 1 wound last time does not exist at the attachment / detachment position P1, a predetermined tension is applied to the separators 3 and 4 supplied by the separator supply means (not shown), and the thermal separator and the excess separator 3 are applied. , 4 can be cut to achieve the same fixation as described above.

  As described above in detail, in the present embodiment, when the separators 3 and 4 are thermally welded to the core core 2, the heater follows the core core 2 that is bent and deformed by the pressure from the heater block 60. The block 60 is bent and deformed.

  Thereby, it is possible to press the heater block 60 in a more appropriate state against the entire longitudinal direction of the core core 2 (the entire width direction of the separators 3 and 4) and apply sufficient pressure. As a result, more uniform welding can be performed in the entire longitudinal direction of the core core 2.

  As a result, the subsequent winding operation can be performed stably and the quality can be improved. Furthermore, there is no need to provide a mechanism or process for supporting the core 2 from the opposite side of the heater block 60, so that the apparatus can be simplified and the production efficiency can be improved.

  In addition, since the heat radiation amount around the slit 65 is increased by providing the slit 65, the center portion in the longitudinal direction where the heat transmission distance from the cartridge heater 62 is short becomes slightly high on the pressing surface 64, and the heat transmission Long-distance longitudinal ends and the like having a long distance are slightly cold. As a result, while reducing over-welding at both ends in the longitudinal direction of the core 2, an appropriate welding state can be obtained at the center in the longitudinal direction, and the above-described effects can be enhanced.

  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 11, but the winding device manufactured by the winding device 11 is not limited to this, for example, Alternatively, a winding element of an electrolytic capacitor or the like may be manufactured.

  (B) In the above embodiment, aluminum is exemplified as the material for the core 2, but other materials, for example, a resin material such as PP, may be used. Thus, when the core core 2 is comprised with a thermoplastic resin material, the process of sticking the adhesive tape 51 in the said embodiment can be skipped. That is, heat welding can be realized without the adhesive tape 51.

  In addition, when the core core 2 is made of a thermoplastic resin material, the above-described problem due to the bending of the core core 2 may appear more prominently, so the effect of the present invention is more effective. .

  (C) In the above embodiment, PP is exemplified as the material of the separators 3 and 4 (and the material of the adhesive tape 51), but other thermoplastic resin materials may be used. For example, other polyolefin resins typified by polyethylene, polyester resins such as polyethylene terephthalate, polyamide resins, and the like may be used.

  Further, the two materials to be welded are not necessarily the same material, but it is desirable that they are materials compatible with each other or materials having substantially the same melting temperature. For example, when a polyolefin-based resin material is used as the material for the separators 3 and 4, it is desirable to use a polyolefin-based material as the material for the adhesive tape 51.

  (D) In the above embodiment, the adhesive tape 51 is described as one aspect of the coating layer of the core core 2, but for example, a thermoplastic resin material softened or melted or dissolved in a predetermined solvent is wound. A resin coating layer provided by adhering and solidifying on the surface of the core core 2 may be embodied as a coating layer.

  (E) In the above embodiment, a configuration in which the adhesive tape 51 is attached to the entire length of the core core 2 is adopted, but the configuration is not necessarily limited to such a configuration. For example, as illustrated in FIG. 8B, the adhesive tape 51 may be attached only to the longitudinal end portions and the longitudinal center portion of the core core 2. Even in such a configuration, the same operational effects as the above-described embodiment can be obtained. Further, from the viewpoint of obtaining the effect of reducing over-welding at both ends in the longitudinal direction of the core 2, as shown in FIG. 8A, the adhesive tape 51 is applied only to both ends in the longitudinal direction of the core 2. It is good also as a structure which sticks.

  Moreover, in the said embodiment, although it is supposed that the adhesive tape 51 of the length of just 1 round is stuck on the surface of the core core 2, it is good also as sticking the adhesive tape 51 for 1 round or more. And as shown in FIG.8 (d), it is good also as sticking the adhesive tape 51 partially in the range which does not reach the perimeter.

  (F) In the said embodiment, although the length along the longitudinal direction is employ | adopted as the core core 2, the length of the core core 2 is not limited to this.

  (G) The material of the heater block 60 is not limited to the aluminum of the above embodiment, and other heat conductive materials may be adopted.

  (H) The shape of the heater block 60 is not limited to the above embodiment. For example, the thin portion 63 may be omitted.

  (I) In the above embodiment, in the thin portion 63, the slit 65 having a predetermined length is formed in parallel with the pressing surface 64 from both longitudinal ends of the heater block 60 toward the longitudinal central portion. The formation position is not limited to the above embodiment.

  For example, as shown in FIG. 9, a configuration may be adopted in which the slit 71 is formed along the pressing direction (direction orthogonal to the pressing surface 64) on the base 70 side of the heater block 60.

  (J) In the above embodiment, the heater block 60 is configured to deform following the bending deformation of the core 2. Not limited to this, the heater block 60 may be fixedly deformed in advance in consideration of the amount of bending of the core core 2. For example, in the configuration shown in FIG. 9, a bolt may be screwed inside along the longitudinal direction of the heater block 60 and the amount of deflection of the heater block 60 may be adjusted by adjusting the bolt. . However, since the amount of bending of the core core 2 is different each time, the heater block 60 may not be pressed in an appropriate state over the entire longitudinal direction of the core core 2. Therefore, it is more preferable that the heater block 60 be deformed following the bending deformation of the core core 2 when the core core 2 is bent as in the above embodiment.

  (K) In the above embodiment, the heater block 60 is bent and deformed by forming the slit 65 in the heater block 60. The configuration in which the heater block 60 is bent and deformed is not limited to the slit 65, and the slit 65 may be omitted as long as the heater block 60 is bent and deformed. As a configuration in which the heater block 60 is bent and deformed, for example, at least a part of the heater block 60 may be formed of a material that can be bent and deformed, or a part of the thin portion 63 may be thinned to an extent that can be bent and deformed. .

  DESCRIPTION OF SYMBOLS 1 ... Battery element, 2 ... Core core, 3, 4 ... Separator, 5 ... Positive electrode foil, 6 ... Negative electrode foil, 7 ... Strip | belt body, 11 ... Winding apparatus, 16 ... Positive electrode foil supply means, 17 ... Negative electrode foil supply means, 20 ... rotating means, 21 ... core, 41 ... separator fixing means, 42 ... adhesive tape attaching means, 43 ... thermal welding means, 44 ... cutting means, 51 ... adhesive tape, 60 ... heater block, 62 ... cartridge heater, 63 ... thin portion, 64 ... pressing surface, 65 ... slit.

Claims (5)

Rotating means that allows a cylindrical core core having a thermoplastic resin material at least part of its surface to be rotatable about its axis;
Thermal welding means capable of thermally welding a strip separator made of a thermoplastic resin material to the core core;
Electrode foil supply means for supplying the positive electrode foil and the negative electrode foil toward the core core, respectively,
After the separator is thermally welded to the core core, the positive electrode foil and the negative electrode foil are insulated from each other via the separator while rotating the core core based on the operation of the rotating means. A winding device for winding in a state,
The heat welding means includes
A heater block having a heating element inside and made of a heat conductive material,
Drive means for driving the heater block so as to press the separator against the core core;
The said heater block is comprised so that bending deformation is possible along the plane containing the axis line of the said core core at least.   The winding device according to claim 1, wherein the heater block is configured to be deformable following the bending deformation of the core core.   The winding device according to claim 1 or 2, wherein the heater block has a slit so as to be deformable. The heater block is
A pressing surface that presses the separator against the core core is formed along the longitudinal direction of the core core parallel to the axis of the core core, and
4. The winding device according to claim 3, wherein the slit having a predetermined length is formed in parallel with the pressing surface from both longitudinal ends toward the longitudinal central portion.   The winding device according to claim 3 or 4, wherein the slit is formed closer to the pressing surface than the heating element.

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