JP6031206B1 - Winding device - Google Patents

Abstract

A winding device capable of improving the quality of a winding element while achieving compactness. A winding device 10 includes circumferential length changing mechanisms 13h, 14h, a thickness measuring mechanism for measuring the thickness of an electrode sheet, and a control device. While the circumference changing mechanisms 13h and 14h are provided on the cores 13 and 14, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, The piezoelectric actuators 13j and 14j are configured so that they can return to their original shape and be deformed by electric discharge. The control device can control power feeding and discharging to the piezo actuators 13j and 14j, and controls the piezo actuators 13j and 14j based on the measurement result by the thickness measuring mechanism, so that the circumference of the winding cores 13 and 14 during winding is controlled. Control the length. [Selection] Figure 8

Description

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

  For example, a winding element used as a secondary battery such as a lithium ion battery has a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material through a separator made of an insulating material. Manufactured by being wound in a superposed state.

  Moreover, a predetermined tab may be provided for each electrode sheet. Examples of the tab include a welding tab welded to an active material uncoated portion of the electrode sheet, and a cutting tab formed by intermittently cutting the widthwise end of the electrode sheet.

  In a winding device for manufacturing a winding element, each of the electrode sheets and separator supplied from the roll wound in a roll is transported to a winding core that can be rotated along a separate transport path. Is done. And it winds in the state with which the electrode sheet and the separator were piled up by the winding core, and the winding element is finally obtained by winding the terminal part of a separator with the predetermined fixing tape (for example, patent documents 1). Etc.). In addition, as a winding core, what was provided with the two core pieces provided in the state aligned in the direction orthogonal to the said rotating shaft while extending in the own rotating shaft direction, for example can be employ | adopted.

  By the way, in the obtained winding element, there is a demand for disposing a tab within a predetermined range along the circumferential direction of the winding element. Accordingly, in order to prevent the tabs from being disposed out of the predetermined range due to the variation in the thickness of the electrode sheet, the circumference changing mechanism, the thickness measuring mechanism, and the control device are provided to the winding device. There has been proposed a technique for providing (see, for example, Patent Document 2). The peripheral length changing mechanism changes the length of the wound portion of the electrode sheet or separator along the rotational direction of the core (the peripheral length of the core). The thickness measuring mechanism measures the thickness of the electrode sheet. The control device changes the circumference of the core by controlling the circumference changing mechanism based on the measurement result of the thickness measuring mechanism.

  In the above technique, the circumferential length changing mechanism is configured to change the circumferential length of the core by adjusting the size of the slit formed between both core pieces. More specifically, the peripheral length changing mechanism includes a rail portion extending in a direction orthogonal to the rotation axis of the winding core, and an end portion of one core piece being fixed and attached to the rail portion, and the rail portion extending. A slide portion for allowing the one core piece to slide along the direction. Then, the inclined portion inclined with respect to the rotation axis direction reciprocates along the rotation axis direction, and the one core piece is slid and moved by sliding the roller portion connected to the one core piece. As a result, the size of the slit is adjusted, and as a result, the circumference of the core is changed. The roller portion is pressed against the inclined portion by a predetermined urging member, and as a result, the circumference of the winding core is held at the changed size.

JP-A-11-265726 Japanese Patent Application Laid-Open No. 2006-1624

  By the way, in the above technique, there is a concern that the mechanism for sliding the core piece is somewhat complicated, and a mechanism (biasing member) for holding the circumference of the winding core at the changed size is necessary. is there. Therefore, there exists a possibility that an apparatus may become large sized and complicated.

  Furthermore, in the above technique, when the circumference of the winding core is changed, the inclined portion slides on the roller portion, so that foreign matter such as metal powder may be generated. If foreign matter adheres to the winding element, the quality of the winding element may be degraded.

  The present invention has been made in view of the above circumstances, and its purpose is to allow the tabs to be more reliably disposed within a predetermined range along the circumferential direction of the winding element, while achieving compactness. An object of the present invention is to provide a winding device capable of improving the quality of the winding element.

  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 belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
Equipped with a,
The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
A slit extending in a direction orthogonal to the rotation axis is formed between the core pieces,
One of the core pieces is
A base member that forms the slit between the other of the core pieces;
A movable member arranged to sandwich the actuator configured to be stretchable and deformable along a direction orthogonal to a direction in which the slit extends, with the base member along the deformation direction;
The other of the outer peripheral surface and to the outer peripheral surface of said movable member, winding apparatus characterized that you have been configured such that the electrode sheet and the separator are wound out of two core pieces.

  According to the above means 1, the length along the rotation direction of the portion of the core around which the electrode sheet or the like is wound is controlled by controlling the amount of expansion and contraction of the actuator based on the measured thickness of the electrode sheet. (Hereinafter referred to as “the circumference of the core”) is controlled.

  For example, when the measured thickness of the electrode sheet is relatively large, that is, as the winding proceeds, the rotation of the core is gradually performed from the position where each part along the longitudinal direction of the electrode sheet should be normally disposed In the case of shifting to the front side in the direction (hereinafter, simply referred to as “front side”), the control means makes the circumference of the winding core relatively small. As a result, at the beginning of winding, the respective portions of the electrode sheet are arranged on the rear side in the rotation direction of the winding core (hereinafter simply referred to as “rear side”) with respect to the position where the electrode sheet is normally arranged. And even if each part of the electrode sheet gradually shifts to the front side as the winding advances as much as the arrangement position shifts to the rear side in this way, the shift is absorbed. It becomes.

  On the other hand, when the measured thickness of the electrode sheet is relatively small, that is, as the winding progresses, each part of the electrode sheet is gradually arranged on the rear side from the position where it should be normally arranged. In this case, the control means makes the circumference of the winding core relatively large. Thereby, even if each site | part of an electrode sheet has shifted | deviated gradually to the back side with winding progressing, the shift | offset | difference will be absorbed.

  As described above, according to the above-described means 1, it is possible to more reliably prevent each part of the electrode sheet from being greatly displaced from the position where it should be normally arranged. As a result, the tab provided on the electrode sheet can be more reliably arranged within a predetermined range along the circumferential direction of the winding element.

  In addition, the circumference of the winding core is changed by expansion and contraction due to power feeding in the actuator. Therefore, it is possible to prevent the parts from sliding when changing the circumference of the core. As a result, the occurrence of foreign matter such as metal powder can be more reliably prevented, and the quality of the winding element can be improved.

  Furthermore, the actuator is provided in a winding core (for example, inside the winding core), and is configured to be able to maintain a deformed state when power feeding is interrupted without power feeding. Therefore, it is possible to easily maintain the deformed state of the actuator during rotation of the core without separately providing a mechanism for maintaining the deformed state. Therefore, the apparatus can be effectively downsized.

  At the same time, by removing the winding element from the winding core in a state where the actuator is contracted or deformed back (with the peripheral length of the winding core being relatively small), the wound element is damaged or deformed due to the removal. Can be prevented more reliably. As a result, the quality of the winding element can be improved more effectively.

Further, according to the means 1, when the circumference of the core is changed, the electrode sheet or the like is wound, and the shape of the other outer circumferential surface of both core pieces and the outer circumferential surface of the movable member is changed. Can be prevented. Thereby, it can suppress that the shape of the winding element obtained varies with the change in the circumference of the winding core, and the quality of the winding element can be improved more reliably.

Mean 2. A belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
With
Of the core, the part where the electrode sheet and the separator are wound,
A predetermined fixed perimeter,
A variable circumferential length portion configured such that a protrusion amount with respect to the fixed circumferential length portion is variable;
As the actuator expands and contracts, the amount of protrusion of the variable peripheral portion relative to the fixed peripheral portion varies, so that the length along the rotational direction of the portion of the core where the electrode sheet and the separator are wound is wound. A winding device, characterized in that is configured to be adjusted.

According to the above-described means 2, the circumference of the core is changed by moving the variable circumference of the core around which the electrode sheet and the separator are wound as the actuator expands and contracts. . Therefore, the circumference of the core can be changed with a simple configuration, and the apparatus can be made more compact.

Means 3. A belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
With
The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
A slit extending in a direction orthogonal to the rotation axis is formed between the core pieces,
One of the core pieces is such that, in a cross section orthogonal to the longitudinal direction of the core, the length along the direction in which the slit extends is equal to or greater than the length along the direction orthogonal to the direction in which the slit extends. And a first movable member and a second movable member arranged so as to sandwich the actuator configured to be deformable along the extending direction of the slit along the deformation direction,
As the actuator is deformed, the distance between the first movable member and the second movable member varies, so that the portion of the winding core along which the electrode sheet and the separator are wound is along the rotation direction. A winding device characterized in that the length is changed.

In some cases, a core having two core pieces and having a slit formed between both core pieces may be employed. In this case, the actuator is disposed at a position avoiding the slit where the separator or the like is disposed during winding.

In addition, at least one of both core pieces in the cross section perpendicular to the longitudinal direction of the core has a semicircular arc shape. It may be configured to be longer than the length along the direction orthogonal to the extending direction of the. In such a case, in order to provide the actuator so as to deform along the direction orthogonal to the direction in which the slit extends at a position avoiding the slit in one of the two core pieces, The length needs to be relatively small (for example, less than the radius of a semicircle when the outer peripheral surface of the core piece in the cross section is a semicircular arc). However, if the actuator is short, the amount of deformation of the actuator will be small. Therefore, there is a possibility that a sufficient amount of displacement of the circumference of the winding core cannot be ensured. In particular, when the core has a relatively small diameter, the actuator must be made shorter, and the amount of displacement of the circumference of the core may be extremely small.

In this regard, according to the means 3, the actuator can be deformed along the direction in which the slit extends. Therefore, even if the actuator is arranged at a position avoiding the slit, a longer actuator can be used. Thereby, a sufficient amount of displacement of the circumference of the winding core can be ensured. As a result, the tab position can be corrected in accordance with a wider range of electrode sheet thickness variations.

The means 3 is particularly effective when the core has a relatively small diameter.

Means 4 . The winding device according to any one of means 1 to 3, wherein the actuator is a piezo actuator provided with a piezoelectric element.

According to the means 4 , since a piezo actuator is used as the actuator, the circumference of the winding core can be controlled with very high accuracy (for example, in units of microns).

  Furthermore, since the piezo actuator can be displaced (charged) at a very high speed, the circumference of the winding core can be changed instantaneously, and the productivity can be increased.

  Further, since the wear of the actuator does not occur when the circumference of the core is changed, it is possible to prevent the accuracy related to the control of the circumference of the core from being lowered due to the repeated change of the circumference of the core. As a result, almost no maintenance or the like for dealing with a decrease in accuracy is required, and productivity can be further improved.

Means 5 . The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
One of the core pieces has a chuck means capable of sandwiching at least the separator of the electrode sheet and the separator in a slit formed between the core pieces and the other of the core pieces. A winding device according to any one of means 1 to 4 .

  There is a possibility that the winding core bends or tilts due to the tension from the wound electrode sheet or the like. Here, if the winding core bends or tilts, the tab position correction accuracy decreases, and the electrode sheet or separator may meander or wrinkle, resulting in production. There is a risk that the quality of the winding element cannot be sufficiently improved.

In this regard, according to the means 5, when the separator or the like is sandwiched by the chuck means, one core piece is supported by the other core piece via the chuck means. Therefore, it is possible to more reliably prevent the winding core from being bent or inclined during winding, etc., and to improve the tab position correction accuracy and more effectively suppress the meandering and wrinkling of the electrode sheet and separator. be able to. As a result, the quality of the winding element can be further improved.

Means 6 . The control means discharges the actuator after completion of winding of the electrode sheet and the separator with respect to the winding core and before starting winding of the next electrode sheet and the separator with respect to the winding core. The winding device according to any one of means 1 to 5 , wherein the winding device is configured.

According to the means 6 , the actuator is once discharged and the deformation state of the actuator is reset before winding the next electrode sheet or the like on the core. Therefore, the effect of hysteresis characteristics, etc. compared to the case where the circumference of the core is changed to the target value corresponding to the electrode sheet to be wound next without resetting the deformation state of the actuator after winding. And the circumference of the winding core can be adjusted to the target value with higher accuracy. As a result, the tab position correction accuracy can be further improved, and the quality of the winding element can be further improved.

It is a perspective schematic diagram which shows schematic structure of a battery element. It is a plane schematic diagram of the positive electrode sheet for showing a positive electrode tab. It is a plane schematic diagram of the negative electrode sheet for showing a negative electrode tab. It is a schematic block diagram of a winding apparatus. It is a schematic block diagram of a winding part. It is a perspective schematic diagram of a core. It is the JJ sectional view taken on the line of FIG. 6 in the state which contracted the chuck mechanism. It is the JJ sectional view taken on the line of FIG. 6 in the state which expanded the chuck mechanism. It is a flowchart of a correction value / applied voltage determination step. It is a flowchart of a winding process. It is a schematic block diagram of the winding part in changing the circumference of a winding core. It is a schematic block diagram of the winding part at the time of arrange | positioning a separator to a slit. It is a schematic block diagram of the winding part at the time of a separator being cut | disconnected. It is a schematic block diagram of the winding part at the time of removing a battery element from a winding core. It is a schematic diagram for demonstrating the position of the tab when not changing the circumference of a core, when the thickness of an electrode sheet is comparatively large. It is a schematic diagram for demonstrating the position of the tab when not changing the circumference of a core in case the thickness of an electrode sheet is comparatively small. It is a cross-sectional schematic diagram of the core in another embodiment. It is a cross-sectional schematic diagram of the core in another embodiment. It is a cross-sectional schematic diagram of the core in another embodiment. It is a cross-sectional schematic diagram of the core in another embodiment. It is a cross-sectional schematic diagram of the core 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 apparatus will be described.

  As shown in FIG. 1, a lithium ion battery element 1 (hereinafter simply referred to as “battery element 1”) is a state in which a positive electrode sheet 4 and a negative electrode sheet 5 are overlapped via two separators 2 and 3. It is manufactured by being wound in Instead of the two separators 2 and 3, one folded separator may be used. In the following, for convenience of explanation, the separators 2 and 3 and the electrode sheets 4 and 5 may be referred to as “various sheets 2 to 5”.

  The separators 2 and 3 each have a strip shape having the same width, and an insulator such as polypropylene (PP) is used to prevent the different electrode sheets 4 and 5 from contacting each other to cause a short circuit. It is configured.

  The electrode sheets 4 and 5 are made of thin metal sheets and have substantially the same width as the separators 2 and 3. Moreover, the active material is apply | coated to the front and back both surfaces of the electrode sheets 4 and 5. FIG. For example, an aluminum foil sheet is used as the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles) is applied to both the front and back surfaces at predetermined intervals. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon or the like) is applied to both the front and back surfaces at predetermined intervals. And ion exchange between the positive electrode sheet 4 and the negative electrode sheet 5 can be performed through the active material. More specifically, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5 side during charging, and ions move from the negative electrode sheet 5 side to the positive electrode sheet 4 side during discharging.

  In addition, in the present embodiment, the lengths of the electrode sheets 4 and 5 constituting each battery element 1 are set to predetermined predetermined values. In the present embodiment, the length of the negative electrode sheet 5 for one element is slightly larger than the length of the positive electrode sheet 4 for one element so that the negative electrode sheet 5 covers the positive electrode sheet 4 more reliably. Has been.

  In addition, as shown in FIG. 2, the active material non-applied portion 4b in the positive electrode sheet 4 (in FIGS. 2 and 3, the active material-applied portion has a dotted pattern) is provided as a positive tab. The electrode tab 4a is welded, and a protective tape 7 for protecting the positive electrode tab 4a is attached. Further, as shown in FIG. 3, a negative electrode tab 5a as a tab is welded to the active material uncoated portion 5b in the negative electrode sheet 5, and a protective tape 7 for protecting the negative electrode tab 5a is provided. It is affixed. A plurality of positive electrode tabs 4 a extend from one edge in the width direction of the positive electrode sheet 4, and a plurality of negative electrode tabs 5 a extend from the other edge in the width direction of the negative electrode sheet 5. .

  In addition, the battery element 1 according to the present embodiment has a rotationally symmetric shape such as a circular shape in the outer peripheral shape in the axial orthogonal cross section. And the positive electrode tab 4a and the negative electrode tab 5a are comprised so that it may be arrange | positioned in the predetermined range along the circumferential direction of the battery element 1, respectively. In the present embodiment, in the ideal state, the positive electrode tabs 4a are arranged in one row at one end portion of the battery element 1, and the negative electrode tabs 5a are arranged in one row at the other end portion of the battery element 1. (See FIG. 1).

  In obtaining a lithium ion battery, the wound battery element 1 is disposed in a battery container (case) (not shown) that is made of metal and has a cylindrical shape, and the positive electrode tab 4a and the negative electrode tab 5a are gathered together. It is done. Then, the combined positive electrode tab 4a is connected to a positive terminal component (not shown), and the negative electrode tab 5a is also connected to a negative terminal component (not shown). A lithium ion battery can be obtained by being provided so as to close both ends of the container.

  Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 4, the winding device 10 includes a winding unit 11 for winding various sheets 2 to 5, and a positive electrode sheet supply mechanism 31 for supplying the positive electrode sheet 4 to the winding unit 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding unit 11; separator supply mechanisms 51 and 61 for supplying the separators 2 and 3 to the winding unit 11; The control device 81 is provided. Various mechanisms in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61 are controlled by a control device 81.

  The positive electrode sheet supply mechanism 31 includes a positive electrode sheet original fabric 32 in which the positive electrode sheet 4 is wound in a roll shape. The positive electrode sheet original fabric 32 is supported so as to be freely rotatable, and the positive electrode sheet 4 is appropriately pulled out from here.

  In addition, the thickness of the positive electrode sheet 4 constituting the positive electrode sheet raw fabric 32 may be different for each lot of the positive electrode sheet raw fabric 32 because the application thickness of the active material is different. Moreover, also in the positive electrode sheet 4 which comprises the one positive electrode sheet original fabric 32, thickness may differ in each site | part. The same applies to the negative electrode sheet 5.

  The positive electrode sheet supply mechanism 31 includes a sheet insertion mechanism 71, a sheet cutting cutter 72, a tension applying mechanism 73, a buffer mechanism 75, and a thickness measuring mechanism 77 as thickness measuring means.

  The sheet insertion mechanism 71 supplies the positive electrode sheet 4 to the winding unit 11, and approaches the winding unit 11 along the conveyance path of the positive electrode sheet 4, and is separated from the winding unit 11. It is configured to be movable to a separated position. The sheet insertion mechanism 71 includes a pair of chucks 71 a and 71 b that can grip the positive electrode sheet 4. The chucks 71a and 71b are configured to be opened and closed by driving means (not shown). When the positive electrode sheet 4 is supplied to the winding unit 11, the sheet insertion mechanism 71 approaches the winding unit 11 after the positive electrode sheet 4 is gripped by the chucks 71 a and 71 b. Yes.

  The sheet cutting cutter 72 is for cutting the positive electrode sheet 4 and includes a pair of blade portions 72 a and 72 b positioned on both the front and back sides of the positive electrode sheet 4. The sheet cutting cutter 72 is movable between a sheet cutting position where the pair of blade portions 72 a and 72 b sandwich the positive electrode sheet 4 and a retreat position where the positive electrode sheet 4 is retreated out of the conveyance path. It is configured.

  The positive electrode sheet 4 is cut while the positive electrode sheet 4 is held by the chucks 71a and 71b. Further, when the sheet insertion mechanism 71 moves closer to the winding part 11 side to supply the positive electrode sheet 4 to the winding part 11, the pair of blade parts 72 a and 72 b respectively transport the positive electrode sheet 4. By moving away from the path, the movement of the sheet insertion mechanism 71 is not hindered.

  The tension applying mechanism 73 includes a pair of rollers 73a and 73b and a dancer roller 73c provided so as to be swingable between the rollers 73a and 73b. The dancer roller 73c is operated by a predetermined servo motor (not shown) whose torque is controlled, and is configured such that the tension applied to the positive electrode sheet 4 can be changed by the control device 81 controlling the servo motor. ing. The dancer roller 73 c also serves to prevent loosening of the positive electrode sheet 4 by applying tension to the positive electrode sheet 4.

  The buffer mechanism 75 includes a pair of driven rollers 75a and 75b, and an elevating roller 75c provided between the rollers 75a and 75b so as to be vertically displaceable. By providing the buffer mechanism 75, the positive electrode sheet 4 having a length constituting at least one battery element can be stored between the sheet cutting cutter 72 and the thickness measuring mechanism 77.

  The thickness measuring mechanism 77 includes a pair of rollers 77a and 77b, a first length measuring roller 77c, and a second length measuring roller 77d. On the outer periphery of the first length measuring roller 77c, the positive electrode sheet 4 positioned between both rollers 77a and 77b is folded and bent. The second length measuring roller 77d is disposed so as to sandwich the folded portion of the positive electrode sheet 4 with the first length measuring roller 77c.

  The length measuring rollers 77c and 77d are driven rollers that have the same diameter and can freely rotate, and rotate as the positive electrode sheet 4 is conveyed. The rotation amounts of both length measuring rollers 77c and 77d can be grasped by an encoder (not shown), and information related to the rotation amounts of both length measuring rollers 77c and 77d is input to the control device 81 from the encoder. It has become.

  Since the positional relationship between the two length measuring rollers 77c and 77d and the positive electrode sheet 4 is set as described above, when the positive electrode sheet 4 passes between the two length measuring rollers 77c and 77d, The amount of rotation of the first length measuring roller 77c that contacts the inner peripheral surface (bent inner surface) of the electrode sheet 4 and the amount of rotation of the second length measuring roller 77d that contacts the outer peripheral surface (bent outer surface) of the positive electrode sheet 4 There will be a difference. The difference in the amount of rotation is larger as the positive electrode sheet 4 is thicker and smaller as the positive electrode sheet 4 is thinner.

  The negative electrode sheet supply mechanism 41 includes a negative electrode sheet original fabric 42 in which the negative electrode sheet 5 is wound in a roll shape on the most upstream side. The negative electrode sheet original fabric 42 is rotatably supported, and the negative electrode sheet 5 is appropriately pulled out from here.

  Further, in the middle of the conveyance path of the negative electrode sheet 5 from the negative electrode sheet original 42 to the winding part 11, as in the conveyance path of the positive electrode sheet 4, a sheet insertion mechanism 71, a sheet cutting cutter 72, tensioning is applied. A mechanism 73, a buffer mechanism 75, a thickness measuring mechanism 77, and the like are provided. Since these various configurations are the same as those provided in the conveyance path of the positive electrode sheet 4, detailed description thereof is omitted.

  On the other hand, the separator supply mechanisms 51 and 61 are provided with original separators 52 and 62 in which the separators 2 and 3 are wound in a roll shape, respectively. The separator webs 52 and 62 are supported so as to be freely rotatable, and the separators 2 and 3 are appropriately pulled out therefrom.

  Further, a tension applying mechanism 73 is provided in the middle of the transport path of the separators 2 and 3, similarly to the transport path of the electrode sheets 4 and 5. Since the various configurations of the tension applying mechanism 73 are the same as those provided in the conveyance path of the electrode sheets 4 and 5, detailed description thereof will be omitted.

  The tension applying mechanism 73 of each of the supply mechanisms 31, 41, 51, 61 is configured to be able to change the tension applied to the various sheets 2 to 5. A constant tension is always applied to the sheets 2 to 5.

  Further, various guide rollers (reference numerals omitted) for guiding the various sheets 2 to 5 such as a pair of guide rollers 78 a and 78 b that collectively collect the various sheets 2 to 5 are provided in the middle of the supply paths of the various sheets 2 to 5. Is provided.

  Next, the configuration of the winding unit 11 will be described. As shown in FIG. 5, the winding unit 11 includes a turret 12 composed of two opposing disk-like tables rotatably provided by a driving mechanism (not shown), and an interval of 180 ° in the rotation direction of the turret 12. And two support rollers 15a and 15b provided at positions shifted by about 90 ° in the rotation direction of the turret 12 with respect to the cores 13 and 14, respectively, and a separator cutter. 16, a presser roller 17 for pressing the various sheets 2 to 5 just before the winding is completed, a tape applying mechanism 18 for applying a predetermined fixing tape, and an energizing terminal 19.

  The winding cores 13 and 14 are for winding the various sheets 2 to 5 on the outer peripheral side of the winding cores 13 and 14, respectively, and are configured to be rotatable about their own central axis as a rotation axis by a driving mechanism (not shown). The amount of rotation of the winding cores 13 and 14 can be grasped by an encoder (not shown), and information regarding the amount of rotation is input to the control device 81 from the encoder.

  Further, the winding cores 13 and 14 are provided so as to be able to appear and retract with respect to one table constituting the turret 12 along the axial direction of the turret 12 (the depth direction in FIG. 5). When the cores 13 and 14 protrude from the one table, the leading ends thereof are inserted into receiving holes formed in the other table, and can be rotated by both tables. It has come to be supported.

  Furthermore, the winding cores 13 and 14 are configured to be capable of turning between the winding position P1 and the removal position P2 when the turret 12 rotates.

  The winding position P1 is a position where the various sheets 2 to 5 are wound around the winding cores 13 and 14, and the various sheets 2 to 2 are respectively supplied from the supply mechanisms 31, 41, 51 and 61 to the winding position P1. 5 will be supplied.

  The removal position P <b> 2 is a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. In the periphery of the removal position P2, a removal device (not shown) for removing the battery element 1 from the winding cores 13 and 14 is provided.

  The support rollers 15a and 15b are for hooking and supporting the various sheets 2 to 5 between the winding cores 13 and 14 moved to the removal position P2 and the supply mechanisms 31, 41, 51 and 61.

  The separator cutter 16 is disposed in the vicinity of the winding position P1, and is a cutting position that approaches the turret 12 and cuts the separators 2 and 3, and a retreat position that is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is possible to move between.

  The presser roller 17 is disposed in the vicinity of the removal position P2, and is located near the turret 12 and presses the various sheets 2 to 5, and a retreat position that is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is configured to be movable between.

  The tape applying mechanism 18 is disposed in the vicinity of the removal position P2 and has a function of approaching the turret 12 and attaching a predetermined fixing tape to the end portions of the separators 2 and 3 at the end of winding. Note that a serial number of the battery element 1 to be attached is preliminarily attached to the fixing tape by printing or the like.

  The energization terminal 19 is disposed in the vicinity of the removal position P2, and is positioned close to the winding core 13 (14) arranged at the removal position P2, and away from the winding core 13 (14). It is possible to move between the retreat positions that do not hinder the movement of 14).

  The energizing terminal 19 is composed of a pair of terminals 19a and 19b (see FIG. 6), and both the terminals 19a and 19b can be compressed and deformed along the moving direction of the energizing terminal 19. Furthermore, one terminal 19a is connected to a power source capable of adjusting the output DC voltage, and the other terminal 19b is connected to the ground. The output voltage from the power source is a positive voltage and is controlled by the control device 81.

  Next, a more detailed configuration of the cores 13 and 14 in the present embodiment will be described.

  As shown in FIGS. 6 to 8, the core 13 (14) has a cross section in which the outer peripheral surface thereof, that is, the portion around which the various sheets 2 to 5 are wound is orthogonal to its own central axis (rotation axis) It is comprised so that circular shape may be made. The winding core 13 (14) includes a pair of core pieces 13a and 13b (14a and 14b) and support portions 13c and 13d (14c and 14d) connected in series with the core pieces 13a and 13b (14a and 14b). I have.

  The core pieces 13a and 13b (14a and 14b) extend along the direction of the rotation axis, and are provided in a state of being aligned in a direction orthogonal to the rotation axis. A slit 13e (14e) extending in a direction orthogonal to the rotation axis is formed between the core pieces 13a and 13b (14a and 14b). Moreover, the site | part located on the opposite side to the said slit 13e (14e) among the outer peripheral surfaces of core piece 13a, 13b (14a, 14b), ie, the site | part by which the various sheets 2-5 are wound, is a cross-sectional semicircle shape. Has been.

  The support portions 13c and 13d (14c and 14d) are portions that support the core pieces 13a and 13b (14a and 14b). The support portions 13c and 13d (14c and 14d) are formed of a metal having excellent mechanical strength, and can firmly support the core pieces 13a and 13b (14a and 14b). Thereby, when winding various sheets 2-5 with respect to the core 13 (14), the bending and inclination of the core pieces 13a and 13b (14a and 14b) can be prevented more reliably. ing. In the present embodiment, the support portions 13c and 13d (14c and 14d) have a semicircular cross section, but as long as the core pieces 13a and 13b (14a and 14b) can be firmly supported, the shapes thereof are It can be changed as appropriate.

  Next, a more detailed configuration of each core piece 13a, 13b (14a, 14b) will be described. First, the structure of one core piece 13a (14a) is demonstrated.

  One core piece 13a (14a) includes a base member 13f (14f), a movable member 13g (14g), and a circumferential length changing mechanism 13h (14h) as a circumferential length changing means. The base member 13f (14f) and the movable member 13g (14g) constitute a semi-cylindrical portion extending in the rotational axis direction of the one core piece 13a (14a).

  The base member 13f (14f) forms a portion that hits the semicircular chord, and has a rectangular bar shape extending in the rotation axis direction. Further, the end of the base member 13f (14f) is coupled to the support portion 13c (14c) so that the base member 13f (14f) does not move along a direction orthogonal to the rotation axis. Further, the surface of the base member 13f (14f) that is located on the rotating shaft side and that forms the slit 13e (14e) is a flat surface.

  The movable member 13g (14g) constitutes a part that hits the arc of the semicircle, and various sheets 2 to 5 are wound around the outer peripheral surface thereof. Further, the base member 13f (14f) is housed inside the movable member 13g (14g).

  The circumferential length changing mechanism 13h (14h) is fixed to both the base member 13f (14f) and the movable member 13g (14g) in a state of being sandwiched by the base member 13f (14f) along the radial direction of the core 13 (14). The circumference changing mechanism 13h (14h) includes a piezo actuator 13j (14j) as an actuator.

  The piezo actuator 13j (14j) is, for example, a stacked piezoelectric actuator that includes a plurality of predetermined piezoelectric elements, and can be fed (charged) and discharged via two conductive wires (not shown). The piezo actuator 13j (14j) can be expanded and contracted along the radial direction of the core 13 (14) along with power supply, and the amount of expansion and deformation corresponding to the power supply voltage (for example, approximately proportional to the power supply voltage). Is configured to vary. The piezo actuator 13j (14j) is configured to return to its original shape and be deformable by electric discharge. The movable member 13g (14g) can move toward and away from the base member 13f (14f) by expansion and contraction of the piezo actuator 13j (14j) accompanying power supply or discharge.

  Furthermore, the piezo actuator 13j (14j) is configured to be able to maintain the deformation state when the power supply is cut off without supplying power. An amplifying mechanism (for example, a lever / link mechanism) for amplifying the expansion / contraction deformation amount may be provided for the piezo actuator 13j (14j).

  In addition, a pair of contact points 13k (14k) arranged side by side along the longitudinal direction of the core 13 (14) is provided on the outer surface of the support portion 13c (14c). Each contact point 13k (14k) is made of a conductive material, and constitutes a contact portion of the energizing terminal 19 with the terminals 19a and 19b. Each contact 13k (14k) is electrically connected to the conductive line, and as a result, is electrically connected to the piezo actuator 13j (14j) via the conductive line. Then, by bringing the energizing terminal 19 into contact with the contact 13k (14k), the piezo actuator 13j (14j) is fed (charged) or discharged, and as a result, expands and contracts or returns to its original shape. It has become.

  In the present embodiment, in a state where the piezo actuator 13j (14j) is not charged, the energizing terminal 19 to which a predetermined reference voltage V0 is applied from the power source to the one terminal 19a is brought into contact with the contact 13k (14k). In this case, the piezo actuator 13j (14j) and the like are configured so that the distance L between the movable member 13g (14g) and the other core piece 13b (14b) becomes a predetermined normal value L0. The normal value L0 is obtained when the battery element 1 is obtained by winding the ideal electrode sheets 4 and 5 having no variation in thickness. In the obtained battery element 1, the tabs 4a and 5a are connected to the battery element 1. Is a distance that is arranged within a predetermined range along the circumferential direction (in the present embodiment, each is arranged in a line).

  Further, in a state where the piezo actuator 13j (14j) is not charged, the power supply terminal 19 to which a voltage higher than a predetermined reference voltage V0 is applied from the power source to the one terminal 19a is brought into contact with the contact 13k (14k). Then, the piezoelectric actuator 13j (14j) is fed (charged) and deformed by extension, and the distance L is set to a value larger than the normal value L0.

  On the other hand, in a state where the piezo actuator 13j (14j) is not charged, the energizing terminal 19 to which a voltage smaller than a predetermined reference voltage V0 is applied from the power source to the one terminal 19a is brought into contact with the contact 13k (14k). Then, although the piezoelectric actuator 13j (14j) is stretched and deformed by being fed (charged), the distance L is set to a value smaller than the normal value L0.

  Further, when the piezo actuator 13j (14j) is charged (deformed), the energization terminal 19 to which no voltage is applied from the power source to the one terminal 19a is brought into contact with the contact 13k (14k). Then, the piezo actuator 13j (14j) discharges and returns to its original shape and deforms. As a result, the distance L is set to the minimum value.

  Thus, in this embodiment, by adjusting the voltage applied from the power supply to one terminal 19a, the distance L varies, and as a result, various sheets 2-5 of the core 13 (14) are wound. The length along the rotation direction of the portion to be formed (hereinafter referred to as the circumferential length of the core 13 (14)) is changed.

  When the power supply to the piezo actuator 13j (14j) is cut off (for example, the energization terminal 19 is separated from the contact point 13k (14k)), the piezo actuator 13j (14j) maintains the deformation state at that time without supplying power. . That is, the distance L is maintained at the changed size, and as a result, the circumference of the core 13 (14) is also maintained at the changed size.

  Then, the structure of the other core piece 13b (14b) is demonstrated. The other core piece 13b (14b) includes a fixing member 13m (14m) and a chuck mechanism 13p (14p) as chuck means.

  The fixing member 13m (14m) extends in the rotation axis direction and has a semicircular cross section, and various sheets 2 to 5 are wound around the arc-shaped outer peripheral surface. The end of the fixing member 13m (14m) is connected to the support portion 13d (14d) so that the fixing member 13m (14m) does not move along the direction orthogonal to the rotation axis. As a result, the relative positions of the fixing member 13m (14m) and the base member 13f (14f) are always unchanged. Furthermore, the fixing member 13m (14m) includes a recess 13n (14n) that extends in the direction of the rotation axis and opens toward the slit 13e (14e).

  The chuck mechanism 13p (14p) has a hexagonal cylindrical shape with its front and rear ends closed, and is fixed to the fixing member 13m (14m) in a state of being disposed in the recess 13n (14n). The chuck mechanism 13p (14p) is connected to an air supply / discharge mechanism (not shown), supplies air to the internal space of the chuck mechanism 13p (14p), and discharges air from the internal space of the chuck mechanism 13p (14p). Is possible.

  The chuck mechanism 13p (14p) expands when air is supplied to the internal space, and a part of the chuck mechanism 13p (14p) protrudes from the surface of the fixing member 13m (14m) on the slit 13e (14e) side. (See FIG. 8). On the other hand, the chuck mechanism 13p (14p) contracts when the air in the internal space is discharged, and the entire chuck mechanism 13p (14p) is immersed in the recess 13n (14n) (see FIG. 7). With this configuration, the separators 2 and 3 inserted through the slits 13e (14e) can be sandwiched between the chuck mechanism 13p (14p) and the base member 13f (14f).

  Next, the configuration of the control device 81 will be described. The control device 81 includes a CPU as a calculation means, a ROM that stores various programs, a RAM that temporarily stores various data such as calculation data and input / output data, and a hard disk that stores calculation data and the like for a long time. As described above, the operation of the winding unit 11 and the supply mechanisms 31, 41, 51, 61 is controlled.

  The control device 81 controls the supply start / supply stop timing of the electrode sheets 4 and 5 to the winding unit 11, the rotation of the winding cores 13 and 14, the operation of the energizing terminal 19, and the applied voltage Va to one terminal 19a. Is done. For example, the control device 81 is configured so that information relating to the feed amounts of the electrode sheets 4 and 5 is input from an encoder (not shown), and when the feed amounts of the electrode sheets 4 and 5 reach predetermined values, the electrodes The feeding (supply) of the sheets 4 and 5 is stopped.

  By the way, when the thickness of the wound electrode sheets 4 and 5 is larger or smaller than the reference value, the obtained battery element 1 may be displaced in the positions of the tabs 4a and 5a. Therefore, the control device 81 adjusts the applied voltage Va to one terminal 19a based on the thickness of the electrode sheets 4 and 5 in order to suppress the displacement of the tabs 4a and 5a, thereby expanding and contracting the piezoelectric actuator 13j (14j). By controlling the amount, the circumference of the cores 13 and 14 is changed.

  More specifically, the control device 81 determines the distance between the length measuring rollers 77c and 77d during the period from the start of feeding of the electrode sheets 4 and 5 to the stop of feeding based on the input information regarding the rotation amount of the length measuring rollers 77c and 77d. The thickness of the whole area along the longitudinal direction in the electrode sheet 4 and 5 for one element which passes through is measured. The electrode sheets 4 and 5 for one element passing between the length measuring rollers 77c and 77d are wound up at the next winding. The control device 81 stores in advance a table showing a correspondence relationship between the difference in rotation amount between the length measuring rollers 77c and 77d and the thickness of the electrode sheets 4 and 5, and by referring to the table, The thickness of the electrode sheets 4 and 5 passing between the length measuring rollers 77c and 77d is obtained.

  Furthermore, the control device 81 responds to the measured thickness of the electrode sheets 4 and 5 (in this embodiment, the average value of the thicknesses of the electrode sheets 4 and 5) based on the correction value calculation formula stored in advance. The corrected value a is calculated. The calculated correction value a is stored in the hard disk together with a serial number for specifying the battery element 1. Normally, when the thickness of the electrode sheets 4 and 5 is smaller than the specified value, a positive number is calculated as the correction value a. When the thickness of the electrode sheets 4 and 5 is larger than the specified value, the correction value a As a result, a negative number is calculated.

  Further, the control device 81 determines the applied voltage Va to the one terminal 19a based on the calculated correction value a. In the present embodiment, the control device 81 determines the applied voltage Va based on a table indicating the correspondence relationship between the correction value a and the applied voltage Va stored in advance. The determined applied voltage Va is stored in the hard disk together with a serial number for specifying the battery element 1. The applied voltage Va is determined to be a voltage larger than the reference voltage V0 when the correction value a is a positive number, and is determined to be a voltage smaller than the reference voltage V0 when the correction value a is a negative number. .

  And before winding the various sheets 2-5, the control apparatus 81 makes the said distance L normal value by making the electricity supply terminal 19 which applied the applied voltage Va to one terminal 19a contact the contact 13k (14k). Increase or decrease by the correction value a from L0. Thereby, the circumferential length of the core 13 (14) is set to correspond to the thickness of the wound electrode sheets 4 and 5.

  In the present embodiment, the control device 81 makes the energizing terminal 19 that is not applied with voltage to one terminal 19a contact the contact 13k (14k) before adjusting the circumference of the core 13 (14). . That is, in this embodiment, before adjusting the circumference of the winding core 13 (14), the piezoelectric actuator 13j (14j) is discharged in advance, and the deformation state of the piezoelectric actuator 13j (14j) is reset once. ing.

  Next, the manufacturing process of the battery element 1 using the winding device 10 described above will be described. The manufacturing process of the battery element 1 is based on the thickness of the electrode sheets 4 and 5 for one element, and calculates the correction value a and the applied voltage Va used when the electrode sheets 4 and 5 for one element are wound. A step of determining (correction value / applied voltage determination step) and a step of winding the electrode sheets 4 and 5 for one element (winding step). Note that both these steps are performed at the same time, but in the present embodiment, for convenience of explanation, these two steps will be described separately.

  First, the correction value / applied voltage determination step will be described with reference to the flowchart of FIG. Both electrode sheets 4 and 5 are gripped by the sheet insertion mechanism 71, and the separators 2 and 3 are wound up by a predetermined amount around one core 13 (14) to which the electrode sheets 4 and 5 are supplied. It is in a state.

  In the correction value / applied voltage determination step, first, in step S11, the negative electrode sheet 5 is supplied to the one core 13 (14) side by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41. Specifically, the sheet insertion mechanism 71 that holds the negative electrode sheet 5 approaches the winding part 11 side, and the negative electrode sheet 5 is inserted between the separators 2 and 3, whereby the negative electrode sheet 5 is supplied. The After the insertion, the holding of the negative electrode sheet 5 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  With the supply of the negative electrode sheet 5, the negative electrode sheet 5 starts to move between the length measuring rollers 77c and 77d, and in step S12, the thickness measurement mechanism 77 starts measuring the thickness of the negative electrode sheet 5. .

  Next, in step S13, after the negative electrode sheet 5 is supplied, when one core 13 (14) rotates a predetermined number of times (for example, one rotation), the sheet insertion mechanism 71 of the positive electrode sheet supply mechanism 31 performs one of the windings. The positive electrode sheet 4 is supplied to the winding core 13 (14) side. Specifically, the sheet insertion mechanism 71 that holds the positive electrode sheet 4 approaches the winding unit 11 side, and the positive electrode sheet 4 is inserted between the separators 2 and 3, whereby the positive electrode sheet 4 is supplied. The Note that after the insertion, the holding of the positive electrode sheet 4 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  With the supply of the positive electrode sheet 4, the positive electrode sheet 4 starts to move between the length measuring rollers 77c and 77d, and the thickness measurement mechanism 77 starts measuring the thickness of the positive electrode sheet 4 in step S14. The

  When both the electrode sheets 4 and 5 are supplied, the one core 13 (14) is rotated so that the both electrode sheets 4 and 5 are sequentially fed out. Thus, the electrode sheets 4 and 5 pass between the length measuring rollers 77c and 77d, respectively, and the thickness of the electrode sheets 4 and 5 is continuously measured.

  In the subsequent step S15, it is repeatedly determined whether or not the feed amount of the positive electrode sheet 4 from the start of supply has reached a predetermined amount until the condition is satisfied.

  When an affirmative determination is made in step S15, that is, when the thickness of the entire area along the longitudinal direction of the positive electrode sheet 4 for one element is measured, the process proceeds to step S16, and the measured positive electrode sheet 4 An average value of the thickness is calculated. In addition, supply of the positive electrode sheet 4 with respect to one core 13 (14) will be stopped at the time of affirmation determination in step S15.

  In further subsequent step S <b> 17, the determination as to whether or not the feed amount of the negative electrode sheet 5 from the start of supply has reached a predetermined value is repeated until the condition is satisfied.

  If an affirmative determination is made in step S17, that is, if the thickness of the entire area along the longitudinal direction of the negative electrode sheet 5 (corresponding to the scheduled winding electrode sheet) for one element is measured, the process proceeds to step S18. And the average value of the thickness of the measured negative electrode sheet 5 is calculated. Note that, when an affirmative determination is made in step S17, the supply of the negative electrode sheet 5 to one of the cores 13 (14) is stopped.

  Next, in step S19, a correction value a corresponding to the average value of the thicknesses of the obtained electrode sheets 4 and 5 is calculated based on the correction value calculation formula described above. The obtained correction value a is stored in the hard disk together with the serial number of the battery element 1.

  In the subsequent step S20, the applied voltage Va is determined based on the calculated correction value a using the table showing the correspondence relationship between the correction value a and the applied voltage Va. Thereafter, the determined applied voltage Va is stored in the hard disk together with the serial number of the battery element 1, and the correction value / applied voltage determining step is terminated.

  Next, the winding process will be described with reference to the flowchart of FIG.

  In the winding process, first, in step S31, the energization terminal 19 is located at the removal position P2 and approaches the contact 13k (14k) of the one core 13 (14) after the battery element 1 is removed. Move (see FIG. 11). One terminal 19a of the energizing terminal 19 has an applied voltage Va determined according to the thickness of the electrode sheets 4 and 5 to be wound around the one core 13 (14). Is applied.

  And when the energization terminal 19 contacts the contact point 13k (14k), the distance L in one winding core 13 (14) is increased or decreased by the correction value a from the normal value L0. As a result, the circumferential length of one of the cores 13 (14) is set to a size corresponding to the thickness of the electrode sheets 4 and 5 to be wound around the core 13 (14). The The piezoelectric actuator 13j (14j) is in a previously discharged state before the energization terminal 19 contacts the contact 13k (14k).

  Thereafter, the energizing terminal 19 is moved away from the contact point 13k (14k) and moved to the retracted position. In addition, the said distance L in one core 13 (14) is maintained by the magnitude | size after increase / decrease.

  Next, in step S32, in the state where one core 13 (14) is submerged with respect to one table in the turret 12 and the chuck mechanism 13p (14p) contracts and enters the recess 13n (14n), the turret 12 is moved. Rotate. Thereby, one core 13 (14) which was in the removal position P2 moves to the winding position P1 side.

  When one of the winding cores 13 (14) is disposed at the winding position P1, the slit 13e (14e) of the winding core 13 (14), the guide rollers 78a and 78b, and the support roller 15a (15b). ), The winding core 13 (14) projects from one table of the turret 12 in a state where the extending direction of the separators 2 and 3 stretched over each other overlaps in front view. Thereby, it will be in the state by which the separators 2 and 3 are arrange | positioned with respect to the slit 13e (14e) of one core 13 (14) (refer FIG. 12). Even if the circumference of the core 13 (14) is changed, the relative positions of the base member 13f (14f) and the fixing member 13m (14m) remain unchanged, and the width of the slit 13e (14e) does not change. It is possible to arrange the separators 2 and 3 more reliably with respect to the slit 13e (14e).

  Next, in step S33, the chuck mechanism 13p (14p) is expanded so that the separators 2 and 3 are sandwiched between the base member 13f (14f) and the chuck mechanism 13p (14p). Then, one core 13 (14) is rotated by a predetermined number. Thereby, it will be in the state by which the separators 2 and 3 were wound up by predetermined amount with respect to one core 13 (14).

  Then, in subsequent step S34, the electrode sheets 4 and 5 are supplied to one of the cores 13 (14). Specifically, as described above, the negative electrode sheet 5 is supplied to the one core 13 (14) side by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41, and then the one core 13 (14). Is rotated a predetermined number of times (for example, one rotation), the positive electrode sheet 4 is supplied to the one core 13 (14) side by the sheet insertion mechanism 71 of the positive electrode sheet supply mechanism 31.

  After the supply of the two electrode sheets 4 and 5, the various sheets 2 to 5 are wound around the one core 13 (14) as the one core 13 (14) rotates.

  In the subsequent step S35, the determination as to whether or not the amount of the positive electrode sheet 4 that has been supplied from the start of supply has reached a predetermined amount is repeated until the condition is satisfied. When an affirmative determination is made in step S35, that is, when the terminal portion of the positive electrode sheet 4 that is currently wound has reached the sheet cutting cutter 72, one core 13 (14) is rotated. The supply of the positive electrode sheet 4 is stopped temporarily.

  Further, in the subsequent step S 36, the positive electrode sheet 4 is gripped by the sheet insertion mechanism 71, and then the positive electrode sheet 4 is cut by the sheet cutting cutter 72. Thereafter, the winding operation of one core 13 (14) is resumed.

  Next, in step S37, the determination as to whether or not the feed amount of the negative electrode sheet 5 from the start of supply has reached a predetermined value is repeated until the condition is satisfied. When an affirmative determination is made in step S 37, that is, when the terminal portion of the negative electrode sheet 5 for one element currently wound reaches the sheet cutting cutter 72, the rotation of one winding core 13 (14). The operation is temporarily stopped and the supply of the negative electrode sheet 5 is stopped.

  In the subsequent step S38, the negative electrode sheet 5 is gripped by the sheet insertion mechanism 71, and then the negative electrode sheet 5 is cut by the sheet cutting cutter 72.

  Next, in step S39, the rotation of one of the winding cores 13 (14) is resumed, whereby the terminal portions (unwinding portions) of the electrode sheets 4 and 5 are wound up.

  In subsequent step S40, the turret 12 is rotated without the separators 2 and 3 being cut. As a result, one core 13 (14) at the winding position P1 moves toward the removal position P2 while pulling out the separators 2 and 3 from the separator supply mechanisms 51 and 61. On the other hand, the other core 14 (13) at the removal position P2 is moved to the winding position P1 side in a state of being submerged in one table of the turret 12. The circumference of the other core 14 (13) is adjusted to correspond to the thickness of the electrode sheets 4 and 5 to be wound next time.

  Subsequently, in step S41, in conjunction with the rotation of the turret 12, the wound core 13 (14) of the various sheets 2 to 5 is rotated about its own central axis as the rotation axis.

  Then, in the next step S42, the winding end process is executed. In the winding end process, first, when the number of rotations of one core 13 (14) reaches a predetermined number, the rotation of one core 13 (14) is stopped. Note that the rotation of the turret 12 is stopped before, simultaneously with, or after the rotation of the one core 13 (14).

  When the rotation of one of the cores 13 (14) and the turret 12 is stopped, one of the cores 13 (14) at the winding position P1 is positioned at the removal position P2 and the other of the cores 13 (14) at the removal position P2 The core 14 (13) is in a state of being positioned at the winding position P1 (see FIG. 13). Further, at this time, the separators 2 and 3 are suspended on the one support roller 15a (15b) between the one core 13 (14) and the guide rollers 78a and 78b.

  In this state, the presser roller 17 is brought close to one of the cores 13 (14), the various sheets 2 to 5 are pressed by the presser roller 17, and the separator cutter 16 approaches the separators 2 and 3. 2 and 3 are cut.

  Prior to cutting the separators 2 and 3, the other core 14 (13) protrudes from one table of the turret 12, so that the separator 2 enters the slit 14 e (13 e) of the other core 14 (13). , 3 are inserted. Further, after the separators 2 and 3 are sandwiched by the chuck mechanism 14p (13p) or the like, the other core 14 (13) is rotated by a predetermined amount, so that the separator 2 is placed on the outer periphery of the other core 14 (13). , 3 are wound by a predetermined amount.

  After the separators 2 and 3 are cut, one core 13 (14) is rotated while the sheets 2 to 5 are being pressed by the pressing roller 17. Thus, the end portions of the separators 2 and 3 and the electrode sheets 4 and 5 are completely wound up without being scattered. Thereafter, the tape pasting mechanism 18 stops the end portions of the separators 2 and 3 with the fixing tape, and the winding end process is completed.

  Next, in step S43, the energizing terminal 19 to which no voltage is applied to one terminal 19a moves closer to the one core 13 (14) and contacts the contact 13k (14k) (see FIG. 14). As a result, the piezoelectric actuator 13j (14j) is discharged, contracted and deformed, and returned to its original shape. As a result, the circumference of one of the cores 13 (14) becomes the minimum value, and the change in the circumference of the core 13 (14) is cancelled. In addition, the stress added to the battery element 1 (various sheets 2-5) located in the outer periphery from one core 13 (14) is cancelled | released by the circumference change of the core 13 (14). Will decrease.

  Finally, in step S44, after the chuck mechanism 13p (14p) contracts and the gripping of the separators 2 and 3 is released, the battery element 1 is removed from the one core 13 (14) by the removing device. By removing, the winding step is completed.

  As described above in detail, according to the present embodiment, for example, when the measured thickness of the electrode sheets 4 and 5 is relatively large, that is, as shown in FIG. The front side in the rotational direction of the core 13 (14) (hereinafter simply referred to as "front side") gradually from the position (position on the dotted line in FIG. 15) where the 4 and 5 tabs 4a and 5a should be normally arranged. The correction value a is a negative number, and the circumference of the core 13 (14) is relatively small. Thereby, at the beginning of winding, each part in the electrode sheets 4 and 5 is arranged on the rear side in the rotation direction of the core 13 (14) (hereinafter, simply referred to as “rear side”) with respect to the position where it is normally arranged. The Rukoto. And even if the tabs 4a and 5a are gradually shifted to the front side as the winding progresses by the amount that the arrangement position is shifted to the rear side in this way, the shift is absorbed. Become. As a result, it is possible to make it more difficult for the tabs 4a and 5a to be arranged so as to be largely displaced forward from the positions where they are normally arranged.

  On the other hand, when the measured thickness of the electrode sheets 4 and 5 is relatively small, that is, as shown in FIG. 16, the tabs 4a and 5a of the electrode sheets 4 and 5 should be normally arranged as the winding proceeds. If the position (position on the dotted line in FIG. 16) is gradually arranged on the rear side, the correction value a is a positive number and the circumference of the core 13 (14) is relatively large. Is done. Thereby, at the beginning of winding, the respective portions of the electrode sheets 4 and 5 are arranged on the front side from the positions where they are normally arranged. And even if the tabs 4a and 5a are gradually shifted to the rear side as the winding advances as much as the arrangement position is shifted to the front side in this way, the shift is absorbed. Become. As a result, it is possible to make it more difficult for the tabs 4a and 5a to be arranged so as to be largely displaced rearward from the positions where they should normally be arranged.

  As a result, the tabs 4a and 5a can be more reliably arranged within a predetermined range along the circumferential direction of the battery element 1.

  Further, the circumferential lengths of the winding cores 13 and 14 are changed by expansion and contraction due to power feeding in the piezoelectric actuators 13j and 14j. Therefore, it is possible to prevent the parts from sliding when the peripheral lengths of the cores 13 and 14 are changed. As a result, the occurrence of foreign matter such as metal powder can be more reliably prevented, and the quality of the battery element 1 can be improved.

  Further, the piezo actuators 13j and 14j are provided on the winding cores 13 and 14 (in the present embodiment, inside the winding cores 13 and 14), and can maintain the deformed state when the power supply is interrupted without power supply. It is configured. Therefore, the deformation state of the actuator can be easily maintained when the winding cores 13 and 14 are rotated without providing a separate mechanism for maintaining the deformation state. Therefore, the winding device 10 can be effectively downsized.

  In addition, since the battery element 1 is removed from the winding cores 13 and 14 with the piezoelectric actuators 13j and 14j returned and deformed, it is possible to more reliably prevent the battery element 1 from being damaged or deformed due to the removal. it can. As a result, the quality of the battery element 1 can be improved more effectively.

  In the present embodiment, by using the piezo actuators 13j and 14j, the circumferential lengths of the winding cores 13 and 14 can be controlled with very high accuracy (for example, in units of microns).

  Further, since the piezo actuators 13j and 14j can be displaced (charged) at a very high speed, the circumferential length of the winding cores 13 and 14 can be instantaneously changed, and the productivity can be improved.

  In addition, since the piezo actuators 13j and 14j are not worn when the circumferences of the cores 13 and 14 are changed, the circumferences of the cores 13 and 14 are increased by repeatedly changing the circumferences of the cores 13 and 14. It can prevent that the precision which concerns on control falls. As a result, almost no maintenance or the like for dealing with a decrease in accuracy is required, and productivity can be further improved.

  In the present embodiment, when the separators 2 and 3 are sandwiched by the chuck mechanisms 13p and 14p, the one core piece 13a (14a) is connected to the other core piece 13b (14b) via the chuck mechanism 13p (14p). It will be in the state supported by. Therefore, it is possible to more reliably prevent the winding cores 13 and 14 from being bent or inclined during winding, and to improve the correction accuracy of the positions of the tabs 4a and 5a, and meandering and wrinkles in the various sheets 2 to 5 Generation | occurrence | production suppression can be aimed at more effectively. As a result, the quality of the battery element 1 can be further improved.

  Further, in the present embodiment, the various sheets 2 to 5 are wound around the outer peripheral surface of the core pieces 13b and 14b and the outer peripheral surfaces of the movable members 13g and 14g. There is no change in shape. Thereby, it can suppress that the shape of the battery element 1 obtained changes with the circumference changes of the cores 13 and 14, and can improve the quality of the battery element 1 more reliably.

  In addition, the piezoelectric actuators 13j and 14j are once discharged before the next various sheets 2 to 5 are wound on the cores 13 and 14, and the deformation state of the piezoelectric actuators 13j and 14j is reset. . Therefore, the influence of hysteresis characteristics and the like can be suppressed, and the circumferences of the cores 13 and 14 can be adjusted to the target value with higher accuracy. As a result, the correction accuracy of the positions of the tabs 4a and 5a can be further increased, and the quality of the battery element 1 can be further increased.

  In addition, the thickness of the entire area of the electrode sheets 4 and 5 for one element before winding is measured in advance, and when winding these electrode sheets 4 and 5, the winding core is based on the thickness measured in advance. The peripheral lengths 13 and 14 are controlled. Therefore, the circumference of the cores 13 and 14 can be optimized according to the thickness of the wound electrode sheets 4 and 5. As a result, the tabs 4a and 5a can be more reliably arranged within a predetermined range.

  Further, by comparing the contents of the hard disk in the control device 81 with the serial number given to the fixing tape, it is possible to easily grasp the correction value a and the applied voltage Va used when obtaining each battery element 1. it can.

  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) The configuration of the cores 13 and 14 in the above embodiment is an example, and the configuration of the cores 13 and 14 can be changed as appropriate.

  Therefore, for example, as shown in FIG. 17, even if the piezo actuator 91d expands and contracts in a portion of the core 91 where the various sheets 2 to 5 are wound (for example, the outer periphery of the one core piece 91a), the shape is formed. A fixed peripheral length portion 91b that is not deformed and a variable peripheral length portion 91c that is configured such that the protrusion amount P with respect to the fixed peripheral length portion 91b can be changed in accordance with the expansion and contraction of the piezo actuator 91d are provided. You may comprise so that a perimeter may be adjusted.

  In this case, the circumference of the winding core 91 can be changed with a simple configuration, and the winding device 10 can be made more compact.

  Further, when the piezo actuator 91d is contracted and deformed, the variable circumferential length portion 91c can be more reliably separated from the separators 2, 3 and the like. As a result, it is possible to more reliably prevent the battery element 1 from being damaged or deformed when the battery element 1 is removed, and to improve the quality of the battery element 1 more effectively.

  Furthermore, the shape of the part (outer peripheral surface) around which the various sheets 2 to 5 are wound is not limited to the circular cross section, and the outer peripheral surface of the core 92 has a cross section as shown in FIG. You may comprise so that an elliptical shape may be made. In the example shown in FIG. 18, one core piece 92a includes a base member 92b, a movable member 92c, and a piezo actuator 92d sandwiched between both members 92b and 92c, and the piezoelectric actuator 92d is deformed. The circumference of the core 92 is adjusted.

  Moreover, as shown in FIG. 19, you may comprise so that the outer peripheral surface of the core 93 may make cross-sectional ellipse shape. In the example shown in FIG. 19, one core piece 93a includes a base member 93b, a movable member 93c, and a piezo actuator 93d sandwiched between both members 93b and 93c, and the piezoelectric actuator 93d is deformed. The circumference of the core 92 is adjusted. In this example, since the piezo actuator 93d is configured to deform along a flat portion on the outer peripheral surface of the winding core 93, a relatively long piezo actuator 93d can be used. Therefore, the circumferential length of the core 93 can be adjusted in a wider range.

  In addition, as shown in FIG. 20, the outer peripheral surface of the core 94 may be configured to have a cross-sectional rhombus shape or a cross-sectional parallelogram shape. Of course, you may comprise so that the outer peripheral surface of a winding core may make a cross-sectional polygonal shape.

  Furthermore, when the outer peripheral surface of the core has a circular cross-section or an elliptical cross-section, that is, as shown in FIG. 21, one core piece 95 a is arranged in a cross-section orthogonal to the longitudinal direction of the core 95. When the length along the extending direction is equal to or longer than the length along the direction orthogonal to the extending direction of the slit 95g, the piezo actuator 95d expands and contracts along the extending direction of the slit 95g. You may comprise. Specifically, a base member 95c, a piezoelectric actuator 95d, a first movable member 95e, and a second movable member 95f are provided for one core piece 95a. The base member 95c is a part that forms a slit 95g with the other core piece 95b. The piezo actuator 95d is attached to the base member 95c, and as described above, is configured to be able to expand and contract along the direction in which the slit 95g extends. The first movable member 95e and the second movable member 95f are disposed so as to sandwich the piezo actuator 95d along the deformation direction thereof, and the distance K between the two movable members 95e and 95f as the piezo actuator 95d expands and contracts. Fluctuates. Then, the circumferential length of the core 95 is adjusted by changing the distance K with the deformation of the piezoelectric actuator 95d.

  In such a configuration, even if the piezo actuator 95d is disposed at a position avoiding the slit 95g, the piezo actuator 95d having a longer displacement and a larger displacement can be used. Thereby, a sufficient amount of displacement of the circumferential length of the core 95 can be ensured. As a result, it is possible to correct the positions of the tabs 4a and 5a in accordance with a wider range of thickness variations of the electrode sheets 4 and 5.

  Such a configuration is particularly effective when it is difficult to ensure a sufficient amount of displacement of the piezoelectric actuator, such as when the diameter of the core is small.

  (B) In the above-described embodiment, the piezo actuators 13j and 14j are cited as the actuator, but an actuator provided with a predetermined functional rubber and a capacitor may be used as the actuator. In addition, as functional rubber, the amount of expansion / contraction deformation varies according to the supply voltage, and it is configured to be deformable by returning to its original shape by discharge [for example, “Smart Rubber” (registered by Sumitomo Riko Co., Ltd.) Trademark)] and the like. Further, the capacitor is arranged in a voltage application path to the functional rubber, and maintains a deformed state when the power supply is cut off in the functional rubber with no power supply (the functional rubber is elasticized when the power supply is cut off). Used to prevent returning to the original shape).

  (C) In the above embodiment, the chuck mechanisms 13p and 14p are configured to operate by being expanded and contracted by air, but the configuration of the chuck mechanism can be changed as appropriate. Further, the chuck mechanism may not be provided (for example, see FIG. 19).

  (D) In the embodiment described above, the displacement of the tabs 4a and 5a is suppressed by adjusting the circumferential length of the cores 13 and 14. You may comprise so that position shift of tab 4a, 5a may be suppressed more reliably by adjusting the tension | tensile_strength provided to the various sheets 2-5.

  (E) In the above embodiment, the power supply that applies a voltage to one terminal 19a is configured to output a positive voltage, but may output a negative voltage. In this case, the circumference of the winding cores 13 and 14 is changed by contracting and deforming the actuator with power feeding.

  (F) The tabs 4a and 5a in the above embodiment are configured to be arranged in a line in the ideal state, but the arrangement positions of the tabs 4a and 5a in the ideal state can be changed as appropriate. For example, the tabs 4a and 5a may be arranged in two rows in the ideal state.

  (G) In the above embodiment, the correction value a and the applied voltage Va are determined based on the thickness of the electrode sheets 4 and 5 before winding, but the thickness of the electrode sheets 4 and 5 after winding ( Based on the thickness of the electrode sheets 4 and 5 in the obtained battery element 1, the correction value a and the applied voltage Va used in the subsequent winding may be determined. That is, based on the thickness of the electrode sheets 4 and 5 in the battery element 1 obtained, the correction value a and the applied voltage Va used at the next and subsequent windings may be feedback controlled. In addition, the thickness of the electrode sheets 4 and 5 after winding can be obtained by analyzing a captured image of the end face of the battery element 1 or the like.

  Further, for example, the thicknesses of the electrode sheets 4 and 5 constituting the raw sheets 32 and 42 may be measured in advance, and the correction value a and the applied voltage Va may be determined based on the previously measured thickness. .

  (H) In the above embodiment, the winding cores 13 and 14 are configured such that the circumference is adjusted when the winding cores 13 and 14 are disposed at the removal position P2. What is necessary is just before winding of the sheets 2-5. Therefore, for example, the circumference of the core 13 (14) may be adjusted at the stage where the core 13 (14) is disposed at the winding position P1. In this case, it is preferable to provide the energization terminal 19 corresponding to the winding position P1.

  (I) The correction value a and the applied voltage Va may be determined based on the thickness of the electrode sheets 4 and 5, and these calculation methods are not particularly limited. Therefore, for example, the correction value a and the applied voltage Va may be determined based on the thicknesses of the electrode sheets 4 and 5 that are measured for a certain period of time or every certain transport amount. Further, the correction value a and the applied voltage Va may be determined based on the individual thicknesses of the electrode sheets 4 and 5, or may be determined based on the total thickness of the electrode sheets 4 and 5. Also good.

  (J) In the above embodiment, the tabs 4a and 5a are joined to the electrode sheets 4 and 5 by welding (so-called welded tabs), but the configuration of the tabs is not limited to this. Therefore, the tab may be, for example, a tab formed between the cuts in the electrode sheet by providing cuts intermittently at the end in the width direction of the electrode sheet (so-called cut tab).

  (K) In the above-described embodiment, the circumferential length changing mechanisms 13h and 14h are provided only on the one core piece 13a (14a), but the circumferential length changing mechanism is different from the core pieces 13a and 13b (14a and 14b), respectively. It is good also as providing.

  (L) In the above embodiment, the separators 2 and 3 are wound to some extent, and then both electrode sheets 4 and 5 are supplied to the core 13 (14) by the sheet insertion mechanism 71. On the other hand, the process of supplying the electrode sheets 4 and 5 to the core 13 (14) is started by gripping both the electrode sheets 4 and 5 together with the separators 2 and 3 by the chuck mechanism 13p (14p). May be configured to be unnecessary.

  (M) In the above-described embodiment, the winding unit 11 includes the two cores 13 and 14, but the number of cores is not limited to this, and one or three winding cores are provided. The structure provided with the above winding core may be sufficient.

  (N) In the above embodiment, the battery device 1 of the lithium ion battery is manufactured by the winding device 10, but the winding device manufactured by the winding device 10 is not limited to this. For example, Alternatively, a wound element or the like of an electrolytic capacitor may be manufactured.

  (O) The materials of the separators 2 and 3 and the electrode sheets 4 and 5 are not limited to the above embodiment. For example, in the above embodiment, the separators 2 and 3 are made of PP, but the separators 2 and 3 may be made of other insulating materials. Further, for example, the active material applied to the electrode sheets 4 and 5 may be appropriately changed.

DESCRIPTION OF SYMBOLS 1 ... Battery element (winding element), 2, 3 ... Separator, 4, 5 ... Electrode sheet, 4a ... Positive electrode tab (tab), 5a ... Negative electrode tab (tab), 10 ... Winding device, 13, 14 ... Core, 13a, 13b, 14a, 14b ... Core piece, 13e, 14e ... Slit, 13f, 14f ... Base member, 13g, 14g ... Movable member, 13h, 14h ... Perimeter changing mechanism (perimeter changing means), 13j , 14j ... Piezo actuator (actuator), 13p, 14p ... Chuck mechanism (chuck means), 81 ... Control device (control means), 91b ... Peripheral length fixing part, 91c ... Fluctuating perimeter part, 95e ... First movable member, 95f ... Second movable member.

Claims (6)

A belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
Equipped with a,
The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
A slit extending in a direction orthogonal to the rotation axis is formed between the core pieces,
One of the core pieces is
A base member that forms the slit between the other of the core pieces;
A movable member arranged to sandwich the actuator configured to be stretchable and deformable along a direction orthogonal to a direction in which the slit extends, with the base member along the deformation direction;
The other of the outer peripheral surface and to the outer peripheral surface of said movable member, winding apparatus characterized that you have been configured such that the electrode sheet and the separator are wound out of two core pieces. A belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
Equipped with a,
Of the core, the part where the electrode sheet and the separator are wound,
A predetermined fixed perimeter,
A variable circumferential length portion configured such that a protrusion amount with respect to the fixed circumferential length portion is variable;
As the actuator expands and contracts, the amount of protrusion of the variable peripheral portion relative to the fixed peripheral portion varies, so that the length along the rotational direction of the portion of the core where the electrode sheet and the separator are wound is wound. There winding apparatus characterized that you have been configured to be adjusted. A belt-like electrode sheet having a predetermined tab and having an active material on the surface and a belt-like separator made of an insulating material are supplied from a predetermined supply mechanism to a rotatable core, and the core rotates. A winding device for winding the electrode sheet and the separator while stacking,
Provided on the winding core, the amount of expansion / contraction deformation varies according to the power supply voltage, and the deformation state at the time of power supply interruption can be maintained without power supply, while it can be deformed by returning to its original shape by discharge A circumferential length changing means comprising an actuated actuator;
A thickness measuring means for measuring the thickness of the electrode sheet;
Power supply and discharge to the actuator can be controlled, and the actuator is controlled based on a measurement result by the thickness measuring unit, so that the electrode sheet and the separator of the winding core are wound during winding. Control means for controlling the length of the portion to be moved along the rotational direction;
Equipped with a,
The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
A slit extending in a direction orthogonal to the rotation axis is formed between the core pieces,
One of the core pieces is such that, in a cross section orthogonal to the longitudinal direction of the core, the length along the direction in which the slit extends is equal to or greater than the length along the direction orthogonal to the direction in which the slit extends. And a first movable member and a second movable member arranged so as to sandwich the actuator configured to be deformable along the extending direction of the slit along the deformation direction,
As the actuator is deformed, the distance between the first movable member and the second movable member varies, so that the portion of the winding core along which the electrode sheet and the separator are wound is along the rotation direction. winding apparatus characterized that you have been configured such that the length is changed. The winding device according to any one of claims 1 to 3, wherein the actuator is a piezoelectric actuator including a piezoelectric element. The winding core includes two core pieces provided in a state extending in the direction of the rotation axis and arranged in a direction orthogonal to the rotation axis,
One of the core pieces has a chuck means capable of sandwiching at least the separator of the electrode sheet and the separator in a slit formed between the core pieces and the other of the core pieces. The winding device according to any one of claims 1 to 4 , characterized in that: The control means discharges the actuator after completion of winding of the electrode sheet and the separator with respect to the winding core and before starting winding of the next electrode sheet and the separator with respect to the winding core. The winding device according to any one of claims 1 to 5 , wherein the winding device is configured.

Images