JP6998186B2 - Winding device, sheet winding method and winding element manufacturing method - Google Patents

Description

The present invention relates to, for example, a winding device for obtaining a winding element built in a secondary battery or the like, a method for winding a sheet such as an electrode sheet, and a method for manufacturing a winding element.

The winding element is formed by winding a predetermined strip-shaped sheet. As the winding element, for example, those used as a secondary battery such as a lithium ion battery are known. In this type of winding element, a positive electrode sheet coated with a positive electrode active material, a negative electrode sheet coated with a negative electrode active material, and a separator sheet for insulating both electrode sheets are wound. Manufactured.

In a winding device for manufacturing a winding element, various sheets such as a positive electrode sheet supplied from a roll-shaped raw fabric are turned into a winding core that can rotate along a separate transport path. Be transported. Then, by rotating the winding core, various sheets are wound in a superposed state to obtain a winding element.

By the way, the sheet itself may have a shape defect such as bending (warping) or twisting. That is, the widthwise edge of the sheet may not be parallel to the longitudinal direction of the sheet, but may be curved. If such a shape defect is present in the sheet, the sheet may be unwound (meandering) in the obtained winding element, which may lead to deterioration of the quality of the product.

On the other hand, for example, it is conceivable to dispose of the defective shape portion of the sheet or the winding element obtained by using the portion as a defective product. However, in this case, the yield deteriorates, which may lead to a decrease in productivity and an increase in manufacturing cost.

Therefore, even when a sheet with a poor shape is used, in order to prevent winding misalignment in the obtained winding element, the widthwise edge of the sheet is set in the sheet transport path upstream of the winding core. A technique has been proposed in which a detection means for detecting the position of the portion and a correction means for adjusting the position of the edge portion in the width direction of the sheet based on the detection result by the detection means are provided (see, for example, Patent Document 1 and the like). ).

Japanese Unexamined Patent Publication No. 2011-246212

However, depending on the degree of shape defect in the sheet, even if the position of the widthwise edge of the sheet is adjusted by the correction means, the widthwise edge of the sheet deviates from the intended position when it is wound around the winding core. In some cases, the winding element may be misaligned.

The present invention has been made in view of the above circumstances, and an object of the present invention is to more reliably prevent the occurrence of unwinding in the obtained winding element even when the sheet has a shape defect. It is an object of the present invention to provide an apparatus, a method for winding a sheet, and a method for manufacturing a winding element.

Hereinafter, each means suitable for solving the above object will be described separately for each item. In addition, the action and effect peculiar to the corresponding means will be added as necessary.

Means 1. A band-shaped sheet supplied to the winding core is wound by rotating a winding core provided with a movable core piece extending along the rotation axis direction while being rotatable on a predetermined rotation axis, and the sheet is rolled up. It is a winding device for manufacturing a winding element that is wound.
A tilting means for tilting the movable core piece with respect to the rotating shaft is provided.
By inclining the movable core piece with respect to the rotating shaft, the shape of the wound portion of the sheet in the winding core is gradually tapered toward the tip side and gradually toward the tip side. A winding device characterized in that it can be changed to a thicker shape.

According to the above means 1, the movable core piece can be tilted with respect to the rotation axis of the winding core by the tilting means, and by tilting the movable core piece, the shape of the winding core is tapered toward the tip side. The shape can be tapered toward the tip side. Therefore, for example, the sheet is curved so that one end edge in the width direction of the sheet wound on the tip end side of the winding core is longer than the other end edge in the width direction of the sheet wound on the base end side of the winding core. In this case, by making the shape of the winding core a tapered shape, it is possible to prevent the edge portion in the width direction of the sheet from being displaced from a desired position when it is wound around the winding core. On the other hand, for example, the sheet is curved so that the other end edge in the width direction of the sheet wound around the base end side of the winding core is longer than the one end edge in the width direction of the sheet wound around the tip end side of the winding core. In this case, by making the shape of the winding core tapered, it is possible to prevent the edge portion in the width direction of the sheet from being displaced from a desired position when it is wound around the winding core.

As described above, according to the above means 1, even if the sheet has a shape defect, it is possible to effectively suppress the displacement of the edge portion in the width direction of the sheet when it is wound around the winding core. .. Therefore, it is possible to more reliably prevent the occurrence of unwinding in the obtained winding element. As a result, it is possible to improve the quality of the product, and it is not necessary to dispose of the sheet having a defective shape as a defective product, so that the productivity can be improved and the manufacturing cost can be suppressed.

Means 2. The sheet is a metal sheet and
A sheet position detecting means for detecting a position in the width direction of the sheet supplied to the winding core, and a sheet position detecting means.
A bending amount detecting means for detecting the bending amount of the sheet based on the detection result by the sheet position detecting means, and a bending amount detecting means.
A driving means capable of tilting the movable core piece by supplying electric power,
1. The means 1 is provided with an inclination angle control means capable of adjusting the inclination angle of the movable core piece with respect to the rotation axis by controlling the drive means based on the detection result by the bending amount detecting means. Winding device.

When changing the shape of the winding core, it is conceivable to manually change the winding core to an appropriate shape according to the state of the sheet. However, in this case, human resources must be devoted to the shape change, and the device needs to be temporarily stopped. Furthermore, in order to find an appropriate winding core shape, after adjusting the winding core shape, the sheet is actually wound around the winding core, and it is checked whether or not the sheet is miswound. It is necessary to repeat the process until the sheet is not unwound. That is, it is very troublesome, and it is necessary to perform time-consuming and labor-intensive work. In addition, if the state of the sheet changes, it will be necessary to perform such work again. Therefore, manually changing the shape of the winding core may lead to a significant decrease in productivity, which in turn may lead to an increase in manufacturing cost.

In this regard, according to the above means 2, the inclination of the movable core piece is adjusted so as to have an appropriate inclination angle according to the bending amount of the sheet by the inclination angle controlling means, the bending amount detecting means, or the like. That is, the shape of the winding core can be automatically changed according to the state of the sheet. Therefore, it is not necessary to devote human resources to change the shape of the winding core or to temporarily stop the device. In addition, there is no need to perform troublesome, time-consuming and labor-intensive work. As a result, the productivity can be increased extremely effectively, and the manufacturing cost can be further reduced.

Means 3. The winding core extends along the direction of the axis of rotation and includes a fixed core piece provided in a state of being aligned with the movable core piece.
The movable core piece is configured to be relatively movable along the directions of approaching and separating from the fixed core piece.
The tilting means
It is provided inside the fixed core piece in a state corresponding to almost the entire longitudinal direction of the movable core piece, and has a first cam portion and a second cam portion in which the distance from the rotation shaft to the outer peripheral surface is not constant, respectively. With a rotatable camshaft,
One of the tip end side portion and the proximal end side portion of the movable core piece is pressed against the outer peripheral surface of the first cam portion along the relative movement direction, and the outer peripheral surface of the second cam portion is pressed against the outer peripheral surface of the second cam portion. A pressing means for pressing the other of the distal end side portion and the proximal end side portion of the movable core piece along the relative moving direction is provided.
The winding device according to means 2, wherein the driving means is configured to rotate the camshaft by being supplied with electric power.

According to the above means 3, the cam shaft has a first cam portion and a second cam portion in which the distance from the rotation shaft to the outer peripheral surface is not constant, and a movable core piece with respect to the outer peripheral surface of the first cam portion. One of the tip side portion and the proximal end side portion of the movable core piece is pressed against the outer peripheral surface of the second cam portion, and the other of the distal end side portion and the proximal end side portion of the movable core piece is pressed against the outer peripheral surface of the second cam portion. .. Therefore, by rotating the cam shaft, the position of the portion of the movable core piece that is pressed against both cam portions can be changed, and the movable core piece can be tilted. Therefore, the core shape can be changed to a tapered shape or a tapered shape relatively easily. Further, by rotating the cam shaft, not only one of the tip end side portion and the proximal end side portion of the movable core piece but also the positions of both can be changed. Therefore, for example, it is possible to further expand the settable range regarding the tilt angle of the movable core piece.

Further, according to the above means 3, the tip end side portion and the proximal end side portion of the movable core piece are in a state of being pressed against the first cam portion or the second cam portion, respectively. Therefore, the movable core piece can be supported in a very stable state by the camshaft, and when a winding force is applied to the winding core due to the winding of the sheet, the movable core piece is deformed (deflection, twist, etc.). It is possible to prevent it from occurring more reliably. As a result, the shape of the winding core can be kept constant more reliably.

Further, according to the above means 3, the fixed core piece may be large enough to accommodate the camshaft inside. Therefore, it is possible to reduce the size of the winding core while realizing the function of changing the shape of the winding core.

Further, since the movable core piece is pressed against the cam shaft, the shape of the winding core does not change unless the cam shaft rotates. That is, according to the above means 3, the situation that the shape of the winding core does not change with the passage of time does not occur. Therefore, it is not necessary to perform a special process for maintaining the shape of the winding core, such as supplying electric power to the drive means at any time, and the productivity can be further improved.

Means 4. The movable core piece is configured to be able to be arranged in a state parallel to the fixed core piece.
In a state where the movable core piece and the fixed core piece are parallel to each other, by rotating the camshaft to one side, the shape of the winding portion of the winding core of the sheet gradually moves toward the tip side. It has a tapered shape, and by rotating the camshaft to the other side, the shape of the winding portion of the sheet in the winding core is configured to gradually taper toward the tip side. The winding device according to means 3, wherein the winding device is provided.

According to the above means 4, the winding core can be tapered by rotating the camshaft to one side, and the winding core can be tapered by rotating the camshaft to the other side. can. Therefore, the relationship between the rotation direction of the camshaft and the change in the shape of the winding core becomes easy to understand, and it becomes possible to more easily adjust and set the shape change of the winding core.

Means 5. A guide that is attached to the fixed core piece and is tiltable with respect to the rotating shaft and supports the movable core piece in a state of being able to approach and separate from the fixed core piece is provided.
The winding device according to means 3 or 4, wherein the guide is provided at a position of the movable core piece away from the portion where the sheet is wound along the direction of the axis of rotation.

The portion of the movable core piece around which the sheet is wound is a portion where rigidity should be particularly ensured, and is made thick, for example, in order to secure rigidity. Therefore, if a guide is provided corresponding to such a portion, the winding core may be increased in size (diameter).

In this regard, according to the above means 5, the guide is provided at a position of the movable core piece away from the winding portion of the sheet. Therefore, it is possible to suppress the increase in size (larger diameter) of the winding core, and it is possible to more reliably reduce the size of the winding core.

Means 6. The guide is provided at least corresponding to the tip end portion and the base end portion of the movable core piece.
The guide supports the movable core piece against the winding force along the direction in which the movable core piece approaches and separates from the fixed core piece, which is applied to the movable core piece as the sheet is wound. The winding device according to means 5, wherein the winding device is configured to be the same.

According to the means 6, the guide supports the movable core piece against the winding force. Therefore, it is possible to more reliably prevent deformation (bending, twisting, etc.) of the movable core piece and increase / decrease in the inclination angle due to the winding force, and it is possible to more reliably maintain the shape of the winding core.

Means 7. The guide
A guide rod having a groove formed by two orthogonal planes while extending along a direction in which the movable core piece approaches and separates from the fixed core piece.
With a slide rod with multiple rotatable rollers arranged in an alternating orthogonal fashion,
A cross roller guide in which the rollers are arranged with respect to the grooves.
The winding device according to means 5 or 6, wherein the guide rod and the slide rod are provided in a state of being arranged side by side along the direction of the axis of rotation.

According to the means 7, as the guide, a cross roller guide in which the guide rod and the slide rod are arranged so as to be arranged along the rotation axis direction of the winding core is used. Therefore, the thickness of the guide in the direction orthogonal to the rotation axis of the winding core, that is, along the radial direction of the winding core can be made smaller. This makes it possible to more effectively reduce the size of the winding core.

Means 8. The drive means is a motor provided with a shaft portion that is rotated by electric power supply.
Any of means 3 to 7, wherein the power transmission mechanism from the shaft portion to the cam shaft includes a worm that rotates with the rotation of the shaft portion and a gear meshed with the worm. The winding device described in.

According to the above means 8, when the shaft portion is rotated, power can be stably transmitted from the shaft portion to the camshaft via the worm and the gear. On the other hand, even if a force in the rotation direction is applied to the camshaft for some reason, the rotation of the gear can be regulated by self-locking by the worm and the gear (that is, the worm gear), and eventually the camshaft is locked. Can be maintained in a state. As a result, unintended rotation of the camshaft can be effectively suppressed, and by extension, unintentional change in the core shape can be prevented more reliably.

Further, according to the means 8, the rotation angle of the gear and the rotation angle of the camshaft can be finely adjusted by configuring the worm to transmit power to the gear while reducing the rotation speed. As a result, the tilt angle of the movable core piece can be finely adjusted, and the shape of the winding core can be changed more finely.

Means 9. 5. The means according to any one of means 3 to 8, wherein the drive means includes a shaft portion that rotates by supplying electric power, and is a motor with a brake that can regulate the rotation of the shaft portion when power is not supplied. Winding device.

The shaft portions in the means 8 and 9 are the same.

According to the above means 9, since the motor with a brake is used as the driving means, it is possible to regulate the rotation of the shaft portion except when the electric power is not supplied, that is, when the shape of the winding core is changed by the electric power supply. can. Therefore, it is possible to more reliably prevent the shaft portion from rotating due to vibration during winding, and it is possible to more reliably prevent the shape of the winding core from being unintentionally changed.

The "motor with brake" is a non-excitation actuated type, and is, for example, a predetermined brake lining, an armature urged toward the brake lining side by a predetermined spring, and a spring when energized. It can be mentioned that it is equipped with a coil that moves the armature away from the brake lining against the urging force. In this "motor with brake", when power is supplied to the motor, the armature is pulled by the energized coil, and a gap is formed between the armature and the brake lining, so that the shaft portion becomes rotatable. On the other hand, when power is not supplied to the motor, the armature is pressed against the brake lining by the spring, so that the rotation of the shaft portion is restricted.

Means 10. The winding device according to any one of means 2 to 9, wherein the electric power supply to the driving means is configured to be performed only when the winding core is stopped.

According to the means 10, power is supplied to the driving means, that is, the shape of the winding core is changed only when the winding core is stopped (when the winding core is not rotating). Therefore, it is not necessary to provide a complicated device (for example, a slip ring or the like) for supplying electric power to the driving means when the winding core rotates. As a result, the device can be simplified and the cost related to the manufacture of the device can be reduced.

Means 11. An energizing terminal for power supply configured so that it can be approached and separated from the winding core,
It is provided with a contact portion provided on the base end side of the winding core.
The winding device according to any one of means 2 to 10, wherein electric power is supplied to the driving means by contacting the energizing terminal with the contact portion.

According to the means 11, the power supply mechanism for the drive means can be realized by a very simple configuration. As a result, it is possible to more effectively reduce the cost related to the manufacture of the device.

Means 12. The winding device according to any one of means 2 to 11, wherein the driving means is provided only on the base end side of the winding core.

According to the means 12, the driving means is provided only on the base end side of the winding core. As a result, it is possible to more effectively reduce the cost related to the miniaturization of the device and the manufacture of the device.

Means 13. The winding core extends along the direction of the axis of rotation and includes a fixed core piece provided in a state of being aligned with the movable core piece.
The tip of the winding core is provided with a supported portion that is supported by a predetermined receiving portion when the winding core rotates.
The winding device according to any one of means 1 to 12, wherein the supported portion is provided at the tip end portion of the fixed core piece.

The fixed core pieces in the means 3 and the means 13 refer to the same thing, and it is not intended that a plurality of fixed core pieces exist in the means 13 subordinate to the means 3.

According to the above means 13, since the supported portion is provided at the tip of the fixed core piece, when the movable core piece is tilted to change the shape of the winding core, the supported portion is matched with the tilt of the movable core piece. Will not move. Therefore, the supported portion can be supported in a stable state by the receiving portion. Further, it is not necessary to adjust the position of the receiving portion or replace the receiving portion according to the change in the position of the supported portion. Therefore, the device can be further simplified. In addition, maintenance and the like can be performed more easily.

Means 14. The core is provided with a slit in which the sheet is placed.
The winding device according to any one of means 1 to 13, wherein the size of the slit is kept constant even when the movable core piece is tilted with respect to the rotating shaft. ..

According to the means 14, the size of the slit is kept constant even when the movable core piece is tilted. Therefore, it is possible to more reliably prevent the arrangement of the sheet with respect to the slit from being hindered, and it is possible to further improve the operational stability of the device.

Means 15. The tilting means includes a movable core piece support portion that rotatably supports a central portion of the movable core piece along the direction of the axis of rotation.
The winding device according to means 1 or 2, wherein the movable core piece is configured to be tilted with respect to the rotation axis by rotating with the center portion as a rotation center.

According to the means 15, the tilting means can be realized by a simple configuration, and the cost related to the manufacture of the apparatus and the like can be reduced.

Further, according to the above means 15, in order to obtain a winding element having a predetermined size, when the sheet is wound with the peripheral length of the portion corresponding to the central portion of the winding core as a predetermined length, the sheet is in the state of the sheet. When the shape of the winding core is changed accordingly, it is not necessary to change the peripheral length of the portion corresponding to the central portion of the winding core as a reference. Further, the difference in peripheral length between the portion corresponding to the central portion of the winding core and the other portions can be made small. Therefore, even when the shape of the winding core is changed, it becomes possible to obtain a winding element of a desired size more reliably and more easily, and it is possible to enhance the convenience of manufacturing the winding element. can.

Means 16. It is a method of winding a sheet used when winding a strip-shaped sheet to be supplied by a winding core provided with a movable core piece extending along the direction of the rotation axis while being rotatable on a predetermined rotation axis. ,
The movable core piece can be tilted with respect to the rotation axis, and by tilting with respect to the rotation axis, the shape of the wound portion of the winding core of the sheet is gradually tapered toward the tip side. It is configured so that it can be changed to a shape that gradually increases toward the tip side and a shape that gradually thickens toward the tip side.
By inclining the movable core piece with respect to the rotating shaft, the shape of the winding portion of the sheet in the winding core is gradually tapered toward the tip side or gradually advanced toward the tip side. The process of changing the shape of the winding core to change to a fat shape, and
A method for winding a sheet, which comprises a winding step of winding the sheet by the winding core after the winding core shape changing step.

According to the means 16, the same effects as those of the means 1 can be achieved.

Means 17. The sheet is a metal sheet and
A sheet position detection step for detecting a position in the width direction of the sheet supplied to the core, and a sheet position detection step.
A bending amount detection step for detecting the bending amount of the sheet based on the detection result by the sheet position detection step, and a bending amount detection step for detecting the bending amount of the sheet.
Including an inclination angle calculation step of calculating the inclination angle of the movable core piece with respect to the rotation axis based on the detection result by the bending amount detection step.
The method for winding a sheet according to means 16, wherein in the winding core shape changing step, the movable core piece is tilted with respect to the rotating shaft based on the tilt angle obtained by the tilt angle calculation step.

According to the means 17, the same effects as those of the means 2 can be achieved.

Means 18. A method for manufacturing a winding element, which comprises manufacturing a winding element in which the sheet is wound by using the method for winding a sheet according to means 16 or 17.

According to the means 18, the same action and effect as those of the means 1 and the like can be obtained.

It is a perspective schematic diagram which shows the schematic structure of a battery element. It is an enlarged plane schematic diagram which shows the curved electrode sheet. It is a schematic block diagram of a winding device. It is a schematic block diagram of a winding part. It is sectional drawing of the winding core. It is a perspective schematic diagram of a 1st core piece. It is a perspective schematic diagram of the 1st core piece which omitted a part of the movable core piece. It is a perspective schematic diagram of the 1st core piece which omitted a part of a fixed core piece. It is a perspective schematic diagram of a 1st core piece in a state where a movable core piece and the like are separated from a fixed core piece. It is an enlarged sectional schematic diagram of the 1st core piece for showing a guide. It is a perspective view schematic diagram of a guide. It is a perspective schematic diagram of a cam shaft and the like. FIG. 12 is a cross-sectional view taken along the line JJ of FIG. FIG. 12 is a cross-sectional view taken along the line KK of FIG. It is a perspective schematic diagram of an actuator, a worm gear, and the like. It is a plane schematic diagram of the 1st core piece when the winding core has a tapered shape. It is a plane schematic diagram of the 1st core piece when the winding core has a thick tip shape. It is a flowchart of the correction angle / power supply determination process. It is a flowchart of a sheet position detection process. It is a flowchart of a shape change / winding process. It is a flowchart of a winding core shape change process. It is a flowchart of a winding process. It is a schematic block diagram of the winding part at the time of changing the shape of a winding core. It is a schematic block diagram of the winding part at the time of arranging a separator sheet in a slit. It is a schematic block diagram of the winding part after rotating a turret. It is a schematic block diagram of the winding part in the case of reducing the peripheral length of a winding core at the time of removing a battery element from a winding core. In another embodiment, it is a perspective schematic view of a first core piece which omits a part of a fixed core piece. In another embodiment, it is a schematic plan view of a first core piece in which a part of the fixed core piece is omitted. In another embodiment, it is a perspective schematic view of a first core piece which omits a part of a fixed core piece. In another embodiment, it is an enlarged sectional schematic diagram of a 1st core piece for showing a movable core piece support part and the like. It is sectional drawing of the winding core in another embodiment.

Hereinafter, one embodiment will be described with reference to the drawings. First, the configuration of the lithium ion battery element as the winding element obtained by the winding device will be described.

As shown in FIG. 1, in the lithium ion battery element 1 (hereinafter, simply referred to as “battery element 1”), a positive electrode sheet 4 and a negative electrode sheet 5 are superposed on each other via two separator sheets 2 and 3. Manufactured by winding in a state. In the present embodiment, the separator sheets 2 and 3 and the both electrode sheets 4 and 5 correspond to the sheets, respectively. Instead of the two separator sheets 2 and 3, one folded separator sheet may be used. Further, in the following, for convenience of explanation, the separator sheets 2 and 3 and the electrode sheets 4 and 5 may be referred to as "various sheets 2 to 5".

The separator sheets 2 and 3 each have a strip shape having the same width, and an insulator such as polypropylene (PP) is used to prevent different electrode sheets 4 and 5 from coming into contact with each other and causing a short circuit. It is composed of.

The electrode sheets 4 and 5 are made of a thin plate-shaped metal sheet, and have substantially the same width as the separator sheets 2 and 3. Further, the active material is applied to both the front and back surfaces of the electrode sheets 4 and 5. For example, an aluminum foil sheet is used for the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles or the like) is coated on both the front and back surfaces thereof. 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 coated on both the front and back surfaces thereof. Then, ion exchange can be performed between the positive electrode sheet 4 and the negative electrode sheet 5 via the active material. More specifically, during charging, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5, and during discharging, ions move from the negative electrode sheet 5 side to the positive electrode sheet 4.

In addition, in the present embodiment, the lengths of the both electrode sheets 4 and 5 constituting one battery element 1 are set to predetermined constant values set in advance. 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 done.

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

When obtaining a lithium-ion battery, the battery element 1 is arranged in a battery container (case) which is made of metal and has a tubular shape (not shown), and the positive electrode lead and the negative electrode lead are put together. Then, the combined positive electrode leads are connected to the positive electrode terminal component (not shown), and the similarly grouped negative electrode leads are connected to the negative electrode terminal component (not shown), and both terminal components are opened at both ends of the battery container. A lithium ion battery can be obtained by being provided so as to close the electrode.

Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 10 has a winding portion 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 portion 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding portion 11, separator supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding portion 11, and a control device. It is equipped with 91. The various mechanisms in the winding device 10, such as the winding section 11 and the supply mechanisms 31, 41, 51, 61, are configured to be operated and controlled by the control device 91.

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 raw fabric 32 is supported so as to be freely rotatable, from which the positive electrode sheet 4 is appropriately pulled out.

As shown in FIG. 2, the positive electrode sheet 4 constituting the positive electrode sheet original fabric 32 has a shape defect such as bending (warping) or twisting, and the edge portion in the width direction of the positive electrode sheet 4 is present. However, it may be in a curved state with respect to the longitudinal direction of the positive electrode sheet 4. This point is the same for the negative electrode sheet 5. Note that FIG. 2 shows the positive electrode sheet 4 in a state where the edge portion in the width direction is extremely curved as compared with the actual one.

Returning to FIG. 3, 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 an edge sensor 77 as a sheet position detection means. ..

The sheet insertion mechanism 71 supplies the positive electrode sheet 4 to the winding portion 11, and is separated from the winding portion 11 at an approaching position approaching the winding portion 11 along the transport path of the positive electrode sheet 4. It is configured to be movable to the separated position. The sheet insertion mechanism 71 includes a pair of chucks 71a and 71b capable of gripping the positive electrode sheet 4. The chucks 71a and 71b are configured to be openable and closable by a drive unit (not shown). Then, when the positive electrode sheet 4 is supplied to the winding portion 11, the positive electrode sheet 4 is gripped by the chucks 71a and 71b, and then the sheet insertion mechanism 71 approaches the winding portion 11. There is.

The sheet cutting cutter 72 is for cutting the positive electrode sheet 4, and includes a pair of blade portions 72a and 72b located on both the front and back sides of the positive electrode sheet 4, respectively. The sheet cutting cutter 72 can move between the sheet cutting position where the pair of blade portions 72a and 72b are located so as to sandwich the positive electrode sheet 4 and the retracting position where the positive electrode sheet 4 is retracted out of the transport path. It is configured.

The positive electrode sheet 4 is cut while the positive electrode sheet 4 is gripped by the chucks 71a and 71b. Further, when the sheet insertion mechanism 71 approaches and moves to the winding portion 11 in order to supply the positive electrode sheet 4 to the winding portion 11, the pair of blade portions 72a and 72b respectively carry out the transport path of the positive electrode sheet 4. By separating from the seat insertion mechanism 71, the movement of the sheet insertion mechanism 71 is not hindered.

The tension applying mechanism 73 has 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 torque-controlled predetermined servomotor (not shown), and the servomotor is controlled by the control device 91 so that the tension applied to the positive electrode sheet 4 can be changed. ing. Further, the dancer roller 73c also plays a role of preventing the positive electrode sheet 4 from loosening by applying tension to the positive electrode sheet 4. In the present embodiment, the tension applying mechanism 73 always applies a constant tension to the positive electrode sheet 4.

The buffer mechanism 75 has a pair of driven rollers 75a and 75b, and an elevating roller 75c provided so as to be displaceable in the vertical direction between the rollers 75a and 75b. 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 edge sensor 77.

The edge sensor 77 is composed of, for example, a laser type or an ultrasonic type edge detection sensor, and detects the position in the width direction of the positive electrode sheet 4 supplied from the positive electrode sheet original fabric 32. The edge sensor 77 is located on both the front and back sides of the positive electrode sheet 4 downstream of the positive electrode sheet original fabric 32. The edge sensor 77 detects the position of one end edge in the width direction of the positive electrode sheet 4 and outputs the detected position in the width direction to the control device 91. The processing related to the detection of the position in the width direction and the output is repeated every predetermined time (for example, several ms) from the start to the end of supply of the positive electrode sheet 4 for one element to the winding portion 11. ..

The negative electrode sheet supply mechanism 41 includes a negative electrode sheet original fabric 42 on which the negative electrode sheet 5 is wound in a roll shape on the most upstream side thereof. The negative electrode sheet original fabric 42 is supported so as to be freely rotatable, from which the negative electrode sheet 5 is appropriately pulled out.

Further, in the middle of the transport path of the negative electrode sheet 5 from the negative electrode sheet raw fabric 42 to the winding portion 11, the sheet insertion mechanism 71, the sheet cutting cutter 72, and tension are applied in the same way as the transport path of the positive electrode sheet 4. A mechanism 73, a buffer mechanism 75, an edge sensor 77, and the like are provided. These are the same as those provided in the transport path of the positive electrode sheet 4, except that they function for the negative electrode sheet 5. Therefore, detailed description of these will be omitted.

On the other hand, the separator supply mechanisms 51 and 61 include separator raw fabrics 52 and 62 in which the separator sheets 2 and 3 are wound in a roll shape, respectively. The separator original fabrics 52 and 62 are supported so as to be freely rotatable, from which the separator sheets 2 and 3 are appropriately pulled out.

Further, the separator supply mechanisms 51 and 61 include a tension applying mechanism 73, similarly to the electrode sheet supply mechanisms 31 and 41. This is the same as that provided in the positive electrode sheet supply mechanism 31 except that the separator sheets 2 and 3 function as targets. Therefore, a detailed description of this will be omitted.

Further, in the middle of the transport path of the various sheets 2 to 5, various guide rollers (reference numerals omitted) for guiding the various sheets 2 to 5 such as a pair of guide rollers 78a and 78b for grouping the various sheets 2 to 5 together. Is provided.

Next, the configuration of the winding unit 11 will be described. As shown in FIG. 4, the winding unit 11 has a turret 12 composed of two disc-shaped tables facing each other rotatably provided by a drive unit (not shown), and the turret 12 is spaced 180 degrees in the rotation direction. The two cores 13 and 14 provided in the above, the two support rollers 15a and 15b provided at positions offset by approximately 90 degrees in the rotational direction of the turret 12 from the cores 13 and 14, respectively, and the separator cutter. A presser roller 17 for holding various sheets 2 to 5 immediately before the end of winding, a tape sticking mechanism 18 for sticking a predetermined fixing tape, and an energizing terminal 19 are provided.

The winding cores 13 and 14 are for winding various sheets 2 to 5 on their outer circumferences, respectively, and are configured to be rotatable around their own central axis by a drive unit (not shown). The amount of rotation of the winding cores 13 and 14 can be grasped by an encoder (not shown), and information on the amount of rotation is input from the encoder to the control device 91.

Further, the winding cores 13 and 14 are provided so as to be able to appear and disappear with respect to one of the tables constituting the turret 12 along the axial direction of the turret 12 (the depth direction of the paper surface in FIG. 4). When the winding cores 13 and 14 are in a state of protruding from one of the tables, the tip thereof is inserted into a receiving hole formed in the other table and is rotatable by both tables. It has come to be supported. In the present embodiment, the portion of the other table that forms the receiving hole corresponds to the receiving portion for supporting the supported portion 85, which will be described later.

Further, the winding cores 13 and 14 are configured to be rotatable between the winding position P1 and the removal position P2 by rotating the turret 12.

The winding position P1 is a position in which various sheets 2 to 5 are wound around the winding cores 13 and 14, and various sheets 2 to 5 are wound from the above-mentioned supply mechanisms 31, 41, 51 and 61 with respect to the winding position P1. Will be supplied.

The removal position P2 is a position for removing various sheets 2 to 5, that is, the battery element 1 after winding. A removal device (not shown) for removing the battery element 1 from the winding cores 13 and 14 is provided in the peripheral portion of the removal position P2.

The support rollers 15a and 15b are for hooking and supporting the separator sheets 2 and 3 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 arranged in the vicinity of the winding position P1 and has a cutting position where the separator sheets 2 and 3 are cut by approaching the turret 12 and a retracting position which is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is movable to and from the position.

The presser roller 17 is arranged in the vicinity of the removal position P2, and has a proximity position where the presser roller 17 approaches the turret 12 and presses various sheets 2 to 5, and a retracting position where the presser roller 17 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 affixing mechanism 18 is arranged in the vicinity of the removal position P2, and has a function of approaching the turret 12 at the end of winding and affixing a predetermined fixing tape to the end portions of the separator sheets 2 and 3. ..

The energizing terminal 19 is arranged in the vicinity of the removal position P2, and is located at an approach position close to the winding core 13 (14) arranged at the removal position P2 and a winding core 13 (14) separated from the winding core 13 (14). It is possible to move to and from the evacuation position that does not hinder the movement of 14).

Further, the energizing terminal 19 is composed of a pair of terminals 19a and 19b (see FIG. 6), and both terminals 19a and 19b can be compressed and deformed along the moving direction of the energizing terminal 19. Further, one terminal 19a is connected to a predetermined power source, and the other terminal 19b is connected to ground. The electric power supplied from the power source to the energizing terminal 19 is controlled by the control device 91.

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

As shown in FIG. 5, the winding core 13 (14) has an elliptical shape in 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 configured to do. The winding core 13 (14) includes a first core piece 131 (141) and a second core piece 132 (142). In addition, in FIG. 5, the first core piece 131 (141) is shown in a particularly simplified state, and the actual first core piece 131 (141) is provided with various parts as shown in FIG. 9 and the like. ..

The first core piece 131 (141) and the second core piece 132 (142) extend along the rotation axis direction of the winding core 13 (14), and are provided in a state of being arranged in a direction orthogonal to the rotation axis. .. Further, a slit 133 (143) extending in a direction orthogonal to the rotation axis is formed between the core pieces 131 and 132 (141, 142).

Further, as shown in FIG. 6, a support portion 134 (144) is connected in series to the proximal end side of the first core piece 131 (141). The support portion 134 (144) is a portion that supports the first core piece 131 (141), and in the present embodiment, it supports the fixed core piece 81 described later. The support portion 134 (144) is formed of a metal having excellent mechanical strength, and can firmly support the first core piece 131 (141). As a result, it is possible to more reliably prevent bending and tilting of the winding cores 13 and 14 when various sheets 2 to 5 are wound around the winding cores 13 and 14. In the present embodiment, the support portions 134 and 144 have a semi-elliptical cross section, but the shape can be appropriately changed as long as the winding cores 13 and 14 can be firmly supported. Although not shown, the second core pieces 132 and 142 are also supported by the same parts as the support portions 134 and 144.

In addition, a pair of contact portions 135 (145) arranged side by side along the rotation axis direction of the winding core 13 (14) are provided on the outer surface of the support portion 134 (144). The contact portion 135 (145) is formed of a conductive material, and constitutes a contact portion between the current-carrying terminals 19 and the terminals 19a and 19b. The contact portion 135 (145) is in a state of being electrically connected to the actuator 843 described later via a predetermined conductive wire. Then, by bringing the energizing terminal 19 into contact with the contact portion 135 (145), electric power can be supplied to the actuator 843 and the actuator 843 can be operated.

Subsequently, a more detailed configuration of the first core piece 131, 141 and the second core piece 132, 142 will be described. First, the configurations of the first core pieces 131 and 141 will be described.

As shown in FIGS. 6 to 9, the first core piece 131 (141) includes a fixed core piece 81, a movable core piece 82, a guide 83, and an inclination changing mechanism 84 as an inclination means. In FIG. 7, a part of the movable core piece 82 is omitted, and in FIG. 8, a part of the fixed core piece 81 (particularly, the first wound winding portion 812 and the bush portion 813, which will be described later) is omitted. Further, FIG. 9 shows a state in which the movable core piece 82 and the like are separated from the fixed core piece 81 in order to clearly show the existence of the guide 83 and the like.

The fixed core piece 81 has a rod shape extending in the rotation axis direction of the winding cores 13 and 14 as a whole, and includes a base portion 811, a first wound winding portion 812, and a bush portion 813.

The base portion 811 is a portion that serves as a base (base) of the first core piece 131, and has a flat plate shape as a whole. The flat surface of the base portion 811 located on the side of the second core pieces 132 and 142 forms the slits 133 and 143 with the second core pieces 132 and 142. Further, a plurality of support protrusions 811a for supporting the spring 842, which will be described later, are formed on the side of the base portion 811 opposite to the connecting portion of the first wound portion 812.

The first wound portion 812 is a curved plate-shaped portion constituting the outer peripheral surfaces of the winding cores 13 and 14, and is a portion around which various sheets 2 to 5 are wound. The first wound winding portion 812 is connected to the widthwise end edge portion of the base portion 811, and between the first wound wound portion 812 and the base portion 811 is the rotation axis direction of the winding cores 13 and 14. A space extending to is formed. The space is a space for arranging the bush portion 813 and the camshaft 841 described later.

The bush portion 813 has a cylindrical shape and is for supporting the camshaft 841 in a rotatable state. A plurality of bush portions 813 are fixed to the first wound portion 812 in the space, and a plurality of bush portions 813 are provided at intervals along the rotation axis direction of the winding cores 13 and 14. The bush portion 813 is composed of, for example, a resin bush formed of a predetermined resin having a low coefficient of friction. The number of bush portions 813 may be appropriately changed according to the lengths of the winding cores 13 and 14.

The movable core piece 82 has a rod shape extending in the rotation axis direction of the winding cores 13 and 14 as a whole, and is provided in a state of being aligned with the fixed core piece 81. The movable core piece 82 includes a second wound winding portion 821 and a pressure contact portion 822.

The second wound portion 821 is a curved plate-shaped portion constituting the outer peripheral surfaces of the winding cores 13 and 14, and various sheets 2 to the second wound portion 821 except for the portions on both ends thereof. 5 is designed to be wound. The second wound portion 821 is provided so as to cover a portion of the base portion 811 that is not covered by the first wound portion 812. Further, among the second wound portions 821, the wound portions of the various sheets 2 to 5 are configured to have a sufficient wall thickness. As a result, the wound portions of the various sheets 2 to 5 in the second wound portion 821 have sufficient rigidity.

The pressure contact portion 822 is a portion pressed against the cam shaft 841, and the portion in contact with the cam shaft 841 has a curved surface shape. The pressure contact portion 822 is fixed to the surface of the second wound portion 821 located on the base portion 811 side, and is provided on the tip end side portion and the base end side portion of the movable core piece 82, respectively. .. Further, each pressure contact portion 822 includes a plate-shaped pressed portion 822a extending in the rotation axis direction of the winding cores 13 and 14.

The guide 83 slides the movable core piece 82 along the direction in which the distance between the fixed core piece 81 and the movable core piece 82 (particularly, the distance between the first wound portion 812 and the second wound portion 821) changes. It supports as much as possible. By being supported by the guide 83, the movable core piece 82 can move relative to the fixed core piece 81 in the direction of approaching and separating from the fixed core piece 81. Further, the guide 83 is provided corresponding to the tip end portion and the base end portion of the movable core piece 82, and supports the tip end portion and the base end portion of the movable core piece 82.

Further, the guide 83 is provided at a position off the movable core piece 82 from the portion where the various sheets 2 to 5 are wound, along the rotation axis direction of the winding cores 13 and 14. That is, the guide 83 is provided at a position of the second wound portion 821 that is out of the portion where the wall thickness is particularly increased in consideration of ensuring rigidity.

Further, as shown in FIGS. 10 and 11, each guide 83 includes a guide rod 831 attached to the fixed core piece 81 and a slide rod 832 attached to the movable core piece 82, respectively. The guide rod 831 and the slide rod 832 are provided side by side along the rotation axis direction of the winding cores 13 and 14.

The guide rod 831 has a groove 831a extending in a direction in which the movable core piece 82 approaches and separates from the fixed core piece 81. The groove 831a is formed by two orthogonal planes.

The slide rod 832 has a plurality of rotatable rollers 832a arranged so that the rotation axes are alternately orthogonal to each other. Then, each roller 832a is in a state of being arranged with respect to the groove 831a, and the slide rod 832 slides with respect to the guide rod 831 by sliding the roller 832a on the plane forming the groove 831a. That is, the guide 83 is a cross roller guide.

Further, when the winding tightening force toward the base portion 811 side is applied to the movable core piece 82 by the guide 83 as the various sheets 2 to 5 are wound, the movable core piece 82 is supported against the winding force. It is possible to do.

Further, a predetermined gap (play) is provided between the guide rod 831 and the slide rod 832. This makes it possible to incline the movable core piece 82 with respect to the rotation shafts (fixed core piece 81) of the winding cores 13 and 14.

Returning to FIGS. 6 to 9, the inclination changing mechanism 84 is a mechanism for inclining the movable core piece 82 with respect to the rotation axes of the winding cores 13 and 14. The tilt changing mechanism 84 includes a camshaft 841, a spring 842 as a pressing means, an actuator 843 as a driving means, and a worm gear 844.

As described above, the cam shaft 841 is supported inside the fixed core piece 81 in a rotatably state by the bush portion 813. The cam shaft 841 is provided in parallel with the rotation shafts of the winding cores 13 and 14 in a state corresponding to almost the entire longitudinal direction of the movable core piece 82 (a state corresponding to the range from the tip end portion to the base end portion of the movable core piece 82). ing. The base end side portion of the camshaft 841 is in a state of protruding to the outside of the fixed core piece 81.

Further, as shown in FIG. 12, the cam shaft 841 includes a first cam portion 841a and a second cam portion 841b. The first cam portion 841a is provided at a position facing the pressure contact portion 822 provided on the tip end side of the movable core piece 82, and the second cam portion 841b is provided on the base end side of the movable core piece 82. It is provided at a position facing the pressure contact portion 822. Both cam portions 841a and 841b are composed of parts of the cam shaft 841 in which the distance from the rotation shaft to the outer peripheral surface is not constant.

Further, in the present embodiment, as shown in FIGS. 13 and 14, both cam portions 841a and 841b have a fan-shaped portion having a central angle of 90 ° in a cross section orthogonal to the rotation axis of the cam shaft 841. It has a cross-sectional shape that is combined with a semicircular part whose diameter is the radius of the fan-shaped part. Therefore, in the cross section orthogonal to the rotation axis of the cam shaft 841, the straight line portion L, the arc portion A, and the semicircular portion S are present on the outer peripheral surfaces of both cam portions 841a and 841b.

The straight portion L is a linear portion having a predetermined length (in the present embodiment, the same length as the maximum radius of the cam shaft 841) with the rotation shaft of the cam shaft 841 as one end. The arcuate portion A is an arcuate portion having a radius centered on the rotation axis of the camshaft 841 and having the predetermined length, and having one end connected to the other end of the straight line portion L and having a central angle of 90 degrees. The semicircular portion S is a semicircular shape that connects one end of the straight line portion L and the other end of the arc portion A, has a radius of half of the predetermined length, and has a shape bulging on the side opposite to the arc portion A. It is a part.

As described above, both the cam portions 841a and 841b have the same shape in the cross section orthogonal to the rotation axis of the cam shaft 841, but the arrangement orientations of the two cam portions are different from each other. Specifically, the outer peripheral surfaces of both cam portions 841a and 841b are projected along the direction of the rotation axis on the virtual surface orthogonal to the rotation axis of the cam axis 841. At this time, the projected outer peripheral surface shape of the second cam portion 841b is the same as the outer peripheral surface shape of the projected first cam portion 841a with reference to a line passing through the rotation axis of the cam shaft 841 and orthogonal to the straight line portion A. It is configured to be line symmetric.

In the present embodiment, the position of the cam shaft 841 is set so that the portion of the outer peripheral surfaces of both cam portions 841a and 841b from the semicircular portion S to the arc portion A faces the cam shaft 841 side. ..

Returning to FIG. 7, the spring 842 is for pressing the pressure contact portion 822 against the outer peripheral surfaces of both cam portions 841a and 841b along the relative movement direction of the movable core piece 82 with respect to the fixed core piece 81. Since the spring 842 is sandwiched by the support protrusion 811a and the pressed portion 822a in a state of being compressed more than the natural length, a force is applied to the pressed portion 822a in a direction away from the support protrusion 811a. As a result, a portion on the tip end side of the movable core piece 82 (pressurized contact portion 822 provided on the tip end side of the movable core piece 82) was pressed against the outer peripheral surface of the first cam portion 841a along the relative movement direction. It is in a state. Further, a portion on the base end side of the movable core piece 82 (pressurized contact portion 822 provided on the base end side of the movable core piece 82) is pressed against the outer peripheral surface of the second cam portion 841b along the relative movement direction. It is in a state of being.

In the present embodiment, in a normal state, one pressure contact portion 822 is in a state of being pressed against the boundary portion between the semicircle portion S and the arc portion A on the outer peripheral surface of the first cam portion 841a, and the other pressure contact portion is contacted. The portion 822 is in a state of being pressed against the boundary portion between the semicircular portion S and the arc portion A on the outer peripheral surface of the second cam portion 841b. Therefore, in the normal state, the movable core piece 82 is in a state parallel to the cam shaft 841, and by extension, is in a state parallel to the rotating shafts of the winding cores 13 and 14 and the fixed core piece 81.

The actuator 843 is a drive source for rotating the camshaft 841. As shown in FIG. 15, the actuator 843 includes a shaft portion 843a that is rotated by power supply. The actuator 843 is composed of a motor with a brake configured so that the shaft portion 843a can rotate in both directions and the rotation of the shaft portion 843a can be regulated when power is not supplied.

More specifically, the actuator 843 is a non-excited actuated motor with a brake, for example, a brake lining (not shown), an armature urged toward the brake lining side by a predetermined spring, and energization. It is provided with a coil that moves the armature away from the brake lining against the urging force of the spring. When electric power is supplied to the actuator 843, the armature is pulled by the energized coil, and a gap is formed between the armature and the brake lining, so that the shaft portion 843a becomes rotatable and supplied. The shaft portion 843a is rotated by the generated electric power. On the other hand, when the electric power is not supplied to the actuator 843, the armature is pressed against the brake lining by the spring, so that the rotation of the shaft portion 843a is restricted.

Further, the actuator 843 is provided only on the proximal end side of the first core piece 131 (141) (see FIG. 6 and the like). That is, the actuator 843 is provided only on the proximal end side of the winding cores 13 and 14.

The worm gear 844 constitutes a power transmission mechanism from the shaft portion 843a to the cam shaft 841. The worm gear 844 includes a worm 844a attached to the shaft portion 843a and rotating with the rotation of the shaft portion 843a, and a gear 844b attached to the camshaft 841 and meshed with the worm 844a. In the present embodiment, the number of teeth of the gear 844b and the like are set so that the rotation speed of the camshaft 841 is about 1/20 to 1/50 of the rotation speed of the shaft portion 843a.

In addition, the tip of the first core piece 131 (141) is a supported portion that is supported by a portion of the turret 12 that forms the receiving hole by being arranged in the receiving hole of the turret 12. 85 is provided (see FIG. 6 and the like). The supported portion 85 is attached to the tip end portion of the fixed core piece 81 so that it is provided at the tip end portion of the fixed core piece 81.

In the first core piece 131 (141) configured as described above, the energization terminal 19 contacts the contact portion 135 (145) and power is supplied to the actuator 843 to regulate the rotation of the shaft portion 843a. After being released, the shaft portion 843a rotates. As a result, power is transmitted from the shaft portion 843a to the cam shaft 841 via the worm gear 844, and the cam shaft 841 rotates. Due to the rotation of the cam shaft 841, the portion of the outer peripheral surface of the cam portions 841a and 841b to which the movable core piece 82 (pressurized contact portion 822) is pressed changes. As a result, the movable core piece 82 is tilted with respect to the rotating shafts (fixed core piece 81) of the winding cores 13 and 14.

More specifically, when the cam shaft 841 is rotated to one side in a normal state, that is, in a state where the fixed core piece 81 and the movable core piece 82 are parallel to each other, the pressure contact portion 822 provided on the tip end side of the movable core piece 82 is provided. Is pressed against the arc portion A on the outer peripheral surface of the first cam portion 841a. On the other hand, the pressure contact portion 822 provided on the base end side of the movable core piece 82 is in a state of being pressed against the semicircular portion S on the outer peripheral surface of the second cam portion 841b. Therefore, the movable core piece 82 is tilted so that only the tip end side portion of the movable core piece 82 approaches the fixed core piece 81. As a result, as shown in FIG. 16, the shape of the wound portion of the various sheets 2 to 5 among the winding cores 13 and 14 becomes a shape that tapers toward the tip side.

On the other hand, in a normal state, that is, in a state where the fixed core piece 81 and the movable core piece 82 are parallel to each other, when the cam shaft 841 is rotated to the other side, the pressure contact portion 822 provided on the tip end side of the movable core piece 82 becomes. It is in a state of being pressed against the semicircular portion S on the outer peripheral surface of the first cam portion 841a. On the other hand, the pressure contact portion 822 provided on the base end side of the movable core piece 82 is in a state of being pressed against the arc portion A on the outer peripheral surface of the second cam portion 841b. Therefore, the movable core piece 82 is tilted so that only the base end side portion of the movable core piece 82 approaches the fixed core piece 81. As a result, as shown in FIG. 17, the shape of the wound portion of the various sheets 2 to 5 among the winding cores 13 and 14 becomes a shape that tapers toward the tip side.

Further, in changing the shape of the winding cores 13 and 14, the movable core piece 82 moves along the direction parallel to the extending direction of the slits 133 and 143 in the cross section orthogonal to the rotation axis of the winding cores 13 and 14. Therefore, the sizes of the slits 133 and 143 are kept constant even when the movable core piece 82 is tilted with respect to the rotation axes of the winding cores 13 and 14.

Returning to FIG. 5, the second core piece 132 (142) includes a fixing member 132a (142a) and a chuck mechanism 132b (142b).

The fixing member 132a (142a) extends in the rotation axis direction of the winding core 13 (14) and has a semi-elliptical cross section. Various sheets 2 to 5 are wound around the outer peripheral surface of the fixing member 132a (142a).

The chuck mechanism 132b (142b) is provided at a portion of the fixing member 132a (142a) corresponding to the slit 133 (143). The chuck mechanism 132b (142b) has a hollow inside and is connected to an air supply / discharge mechanism (not shown). The air supply / discharge mechanism makes it possible to supply air to the internal space of the chuck mechanism 132b (142b) and to discharge air from the internal space of the chuck mechanism 132b (142b).

The chuck mechanism 132b (142b) expands due to the supply of air to its internal space, so that a part of the chuck mechanism 132b (142b) protrudes from the surface of the fixing member 132a (142a) on the slit 133 (143) side. On the other hand, the chuck mechanism 132b (142b) contracts due to the discharge of air from its internal space, so that the entire chuck mechanism 132b (142b) does not protrude from the surface of the fixing member 132a (142a) on the slit 133 (143) side. With such a configuration, the separator sheets 2 and 3 inserted through the slit 133 (143) can be sandwiched by the chuck mechanism 132b (142b) and the first core piece 131 (141).

Subsequently, the configuration of the control device 91 will be described. The control device 91 includes a CPU as an arithmetic means, a ROM for storing various programs, a RAM for temporarily storing various data such as arithmetic data and input / output data, and a hard disk for long-term storage of arithmetic data and the like. As described above, the operation of the winding unit 11 and the supply mechanisms 31, 41, 51, 61 is controlled. The control device 91 controls the supply start / supply stop timings of the electrode sheets 4 and 5 with respect to the winding portion 11, the rotation of the winding cores 13 and 14, the operation of the energization terminal 19, and the like. For example, in the control device 91, information regarding the feeding amount of the electrode sheets 4 and 5 is input from an encoder (not shown), and when the feeding amount of the electrode sheets 4 and 5 reaches a predetermined value, the electrode is used. Stop feeding (supplying) the sheets 4 and 5.

Further, as shown in FIG. 3, the control device 91 includes a width direction position storage unit 92, a bending amount detecting unit 93 as a bending amount detecting means, and an inclination angle control unit 94 as an inclination angle control means. There is.

The width direction position storage unit 92 transmits the detection result input from the edge sensor 77, that is, the information regarding the position of one end edge in the width direction of both electrode sheets 4 and 5 to the hard disk every time there is an input from the edge sensor 77. I remember. In the present embodiment, when the electrode sheets 4 and 5 for one element are wound by the winding cores 13 and 14, one end edge in the width direction of the electrode sheets 4 and 5 for one element to be wound next is used. Information about the position is sequentially input from the edge sensor 77 to the control device 91. As a result, the width direction position storage unit 92 stores information regarding the position of one end edge in the width direction in each part of the electrode sheets 4 and 5 for one element to be wound next in the hard disk.

The bending amount detection unit 93 is based on the information about the position of one end edge in the width direction of both electrode sheets 4 and 5 stored in the hard disk, and the bending amount detection unit 93 bends the electrode sheets 4 and 5 for one element to be wound next. Get the quantity. Here, the amount of curvature is the curvature in the width direction of the electrode sheets 4 and 5 with respect to the longitudinal direction of the electrode sheets 4, 5, that is, the curvature along the surface including the longitudinal direction and the width direction of the electrode sheets 4, 5. The degree of. As the amount of curvature, for example, a line segment X connecting one end edges in the width direction of the electrode sheets 4 and 5 corresponding to two predetermined positions separated along the longitudinal direction of the electrode sheets 4 and 5 is used as a reference line, and this line is used as a reference line. The distance α from the center of the minute X to one end edge in the width direction of the electrode sheets 4 and 5 corresponding to the two center points may be used (see FIG. 2). Further, the curvature of one end edge in the width direction of the electrode sheets 4 and 5 may be used as the amount of curvature.

The tilt angle control unit 94 determines the electric power to be supplied from the energization terminal 19 to the contact units 135 and 145 based on the detection result by the bending amount detection unit 93. Further, the tilt angle control unit 94 controls the operation of the energization terminal 19 and the power supply, and supplies the determined power to the contact portions 135 and 145 to adjust the tilt angle of the movable core piece 82 with respect to the winding cores 13 and 14. Adjust.

More specifically, the tilt angle control unit 94 determines the optimum target tilt angle for the bending amount detected by the bending amount detection unit 93 based on the table showing the relationship between the bending amount and the target tilt angle acquired in advance. obtain. The target inclination angle is an inclination angle of the movable core piece 82, which is considered to be optimal for suppressing unwinding of various sheets 2 to 5, and is set for each bending amount in the table. The table can be obtained based on various information such as the peripheral lengths of the winding cores 13 and 14, the widths of the electrode sheets 4 and 5, and the planned winding positions of the electrode sheets 4 and 5 with respect to the winding cores 13 and 14.

In the present embodiment, the tilt angle control unit 94 obtains a target tilt angle based on the larger bending amount of the bending amounts of both electrode sheets 4 and 5. It should be noted that the target inclination angle may be obtained by using both of the bending amounts of the both electrode sheets 4 and 5. For example, the target inclination angle may be obtained by using the average value of each bending amount.

Further, the tilt angle control unit 94 calculates the correction angle a based on the difference between the obtained target tilt angle and the current tilt angle of the movable core piece 82 after obtaining the target tilt angle. By tilting the movable core piece 82 by the amount of the correction angle a, the tilt angle of the movable core piece 82 with respect to the rotation axes of the winding cores 13 and 14 can be set as the target tilt angle. This is applied to the winding cores 13 and 14 used for winding the electrode sheets 4 and 5 whose bending amount is detected.

Further, the tilt angle control unit 94 determines the power supplied from the energization terminal 19 to the contact unit 135 (145) based on the calculated correction angle a. For example, the tilt angle control unit 94 determines the magnitude, positive / negative, application time, and the like of the voltage applied from the energization terminal 19 to the contact unit 135 (145). In the present embodiment, the tilt angle control unit 94 determines the supply power based on the table showing the correspondence between the correction angle a and the supply power stored in advance.

Then, the tilt angle control unit 94 brought the energizing terminal 19 into contact with the contact portion 135 (145) before winding the various sheets 2 to 5 and when the winding core 13 (14) was stopped. Above, electric power is supplied to the actuator 843 to change the inclination angle of the movable core piece 82 by the correction angle a. As a result, the tilt angle of the movable core piece 82 corresponds to the obtained target tilt angle. The tilt angle control unit 94 stores the tilt angle of the movable core piece 82 after the change in the hard disk as the tilt angle of the current movable core piece 82. Next, when the tilt angle of the movable core piece 82 is changed, the correction angle a or the like is calculated based on the stored tilt angle of the movable core piece 82.

The above-mentioned method for determining the correction angle a and the power supplied to the actuator 843 is an example. The correction angle a and the power supplied to the actuator 843 may be determined based on the amount of bending of the electrode sheets 4 and 5, and these determination methods are not limited to those described above.

Next, a manufacturing process of the battery element 1 using the above-mentioned winding device 10 will be described. The manufacturing process of the battery element 1 is based on the bending amount of the electrode sheets 4 and 5 for one element, and supplies the correction angle a and the actuator 843 used when the electrode sheets 4 and 5 for one element are wound. A process of determining the power (correction angle / power supply determination process) and a process of winding the electrode sheets 4 and 5 for one element while changing the shapes of the cores 13 and 14 as necessary (shape). Includes change / winding process). Although both of these steps are carried out at the same time, in the present embodiment, these two steps will be described separately for convenience of explanation.

In the correction angle / power supply determination step, as shown in FIG. 18, first, in step S10, the seat position detection step is performed. In the sheet position detection step, the position of one end edge in the width direction of the electrode sheets 4 and 5 for one element supplied to the other winding core 14 (13) is detected in the next shape change / winding step.

In the sheet position detection step, as shown in FIG. 19, first, in step S101, the negative electrode sheet 5 is supplied to one winding core 13 (14) side by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41. .. Specifically, the sheet insertion mechanism 71 for gripping the negative electrode sheet 5 approaches the winding portion 11 side, and the negative electrode sheet 5 is inserted between the separator sheets 2 and 3, so that the negative electrode sheet 5 is supplied. Will be done. After the insertion, the negative electrode sheet 5 is released from being gripped by the sheet insertion mechanism 71, and the sheet insertion mechanism 71 returns to its original position.

With the supply of the negative electrode sheet 5, the negative electrode sheet 5 starts to be conveyed to one winding core 13 (14) side, and in step S102, the position of one end edge of the negative electrode sheet 5 in the width direction by the edge sensor 77. Detection is started.

Next, in step S103, after the negative electrode sheet 5 is supplied, one of the winding cores 13 (14) is rotated by a predetermined number of rotations (for example, one rotation) by the sheet insertion mechanism 71 of the positive electrode sheet supply mechanism 31. The positive electrode sheet 4 is supplied to the winding core 13 (14) side. Specifically, the sheet insertion mechanism 71 for gripping the positive electrode sheet 4 approaches the winding portion 11 side, and the positive electrode sheet 4 is inserted between the separator sheets 2 and 3, so that the positive electrode sheet 4 is supplied. Will be done. After the insertion, the positive electrode sheet 4 is released from being gripped by the sheet insertion mechanism 71, and the sheet insertion mechanism 71 returns to its original position.

With the supply of the positive electrode sheet 4, the positive electrode sheet 4 starts to be conveyed to one of the winding cores 13 (14), and in step S104, the edge sensor 77 determines the edge of the positive electrode sheet 4 in the width direction. Position detection is started.

Then, when both electrode sheets 4 and 5 are supplied, one of the winding cores 13 (14) rotates, so that both electrode sheets 4 and 5 are sequentially fed out. As a result, the electrode sheets 4 and 5 pass through the edge sensor 77, respectively, and the positions of one end edges in the width direction of the electrode sheets 4 and 5 are continuously detected. Further, the detected information regarding the position in the width direction is sequentially stored in the hard disk of the control device 91.

In the subsequent step S105, it is repeatedly determined whether or not the amount of the positive electrode sheet 4 drawn out from the start of supply has reached a predetermined value until the condition is satisfied.

When an affirmative judgment is made in step S105, that is, the position of one end edge in the width direction in the entire area of the positive electrode sheet 4 for one element to be wound next is detected, and information on the detected position in the width direction is detected. Is stored in the hard disk, the process proceeds to step S106. When a positive determination is made in step S105, the supply of the positive electrode sheet 4 to one of the winding cores 13 (14) is stopped.

In the following step S106, it is repeatedly determined whether or not the amount of the negative electrode sheet 5 drawn out from the start of supply has reached a predetermined value until the condition is satisfied.

When the affirmative judgment is made in step S106, that is, the position of one end edge in the width direction in the entire area of the negative electrode sheet 5 for one element to be wound next is detected, and the information regarding the detected width direction position is transmitted to the hard disk. If it is stored in, the sheet position detection step is terminated. When a positive determination is made in step S106, the supply of the negative electrode sheet 5 to one of the winding cores 13 (14) is stopped.

Returning to FIG. 18, following the seat position detection step in step S10, the bending amount detection step is performed in step S20. In the bending amount detection step, the bending amount detecting unit 93 detects the bending amount of the electrode sheets 4 and 5 based on the stored information regarding the positions of the electrode sheets 4 and 5 in the width direction.

In the following step S30, the inclination angle calculation step is performed. In the tilt angle detection step, the tilt angle control unit 94 calculates an appropriate target tilt angle for the detected bending amount based on the table showing the relationship between the bending amount and the target tilt angle.

After that, in step S40, the correction angle a is calculated from the tilt angle of the current movable core piece 82 and the calculated target tilt angle. Then, in step S50, the power supply from the energization terminal 19 to the contact portion 135 (145) is determined based on the calculated correction angle a, and the correction angle / supply power determination step is completed.

Next, the shape changing / winding process will be described with reference to the flowchart of FIG. In the shape change / winding step, the winding core shape changing step of step S60 and the winding step of step S70 are performed.

In the winding core shape changing step, as shown in FIG. 21, first, in step S601, the shape of one winding core 13 (14) at which various sheets 2 to 5 are wound in the winding step of step S70 is changed. Whether or not there is a need to do so is determined. If it is necessary to change the shape of one of the winding cores 13 (14), that is, if the correction angle a calculated in step S40 is not 0, the process proceeds to step S602. On the other hand, when it is not necessary to change the shape of one of the winding cores 13 (14), the winding core shape changing step is terminated.

In step S602, the inclination angle of the movable core piece 82 is changed, and the winding core shape changing step is completed. More specifically, the energizing terminal 19 is moved closer to the contact portion 135 (145) of one winding core 13 (14) arranged at the removal position P2 (see FIG. 23). The battery element 1 of the winding core 13 (14) is removed from the winding core 13 (14), and the winding core 13 (14) is in a stopped state. Then, after the energization terminal 19 comes into contact with the contact portion 135 (145), the determined supply power is supplied to the actuator 843 via the contact portion 135 (145). This power supply is determined based on the amount of bending of the electrode sheets 4 and 5 to be wound around the one winding core 13 (14). As a result, the shape of one winding core 13 (14) is changed to one suitable for the bending amount of the electrode sheets 4 and 5 to be wound around the one winding core 13 (14).

After that, the energizing terminal 19 is separated from the contact portion 135 (145) and moved to the retracted position, thereby ending the winding core shape changing step. Even if the energizing terminal 19 is separated from the contact portion 135 (145), the shape of one of the winding cores 13 (14) is maintained as it is.

Next, the winding process of step S70 will be described. In the winding step, as shown in FIG. 22, first, in step S701, one winding core 13 (14) is submerged with respect to one table in the turret 12, and the chuck mechanism 132b (142b) is contracted. , Rotate the turret 12. As a result, one of the winding cores 13 (14) that was in the removal position P2 moves to the winding position P1 side.

Then, when one of the winding cores 13 (14) is arranged at the winding position P1, the slit 133 (143) of the one winding core 13 (14), the guide rollers 78a and 78b, and the support rollers 15a (15b) are arranged. ), One of the winding cores 13 (14) is projected from one of the tables in the turret 12 in a state where the extending directions of the separator sheets 2 and 3 are overlapped with each other in the front view. As a result, the separator sheets 2 and 3 are arranged with respect to the slit 133 (143) of one of the winding cores 13 (14) (see FIG. 24). Further, the supported portion 85 provided at the tip end portion of the winding core 13 (14) is in a state of being supported by the other table in the turret 12. Since the size of the slit 133 (143) does not change even if the shape of the winding core 13 (14) is changed, the separator sheets 2 and 3 can be more reliably arranged with respect to the slit 133 (143). Is.

Next, in step S702, the chuck mechanism 132b (142b) is expanded so that the separator sheets 2 and 3 are sandwiched between the first core piece 131 (141) and the chuck mechanism 132b (142b). Then, one winding core 13 (14) is rotated by a predetermined number. As a result, the separator sheets 2 and 3 are wound by a predetermined amount with respect to one of the winding cores 13 (14).

Then, in the subsequent step S703, the electrode sheets 4 and 5 are supplied to one of the winding cores 13 (14). Specifically, as described above, the negative electrode sheet 5 is supplied to one winding core 13 (14) by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41, and then the one winding core 13 (14) is supplied. At the stage of a predetermined number of rotations (for example, one rotation), the positive electrode sheet 4 is supplied to one of the winding cores 13 (14) by the sheet insertion mechanism 71 of the positive electrode sheet supply mechanism 31.

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

In the following step S704, it is repeatedly determined whether or not the feeding amount of the positive electrode sheet 4 from the start of supply has reached a predetermined value until the condition is satisfied. When an affirmative judgment is made in step S704, that is, when the end portion of the positive electrode sheet 4 for one element currently wound reaches the sheet cutting cutter 72, the rotation operation of one winding core 13 (14) is performed. It is temporarily stopped, and the supply of the positive electrode sheet 4 is stopped.

Further, in the subsequent step S705, 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. After that, the rotation operation of one winding core 13 (14) is restarted.

Next, in step S706, it is repeatedly determined whether or not the amount of the negative electrode sheet 5 drawn out from the start of supply has reached a predetermined value until the condition is satisfied. When an affirmative judgment is made in step S706, that is, when the end 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.

Then, in the subsequent step S707, 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 S708, the end portions (unrolled portions) of the electrode sheets 4 and 5 are wound by restarting the rotation of one of the winding cores 13 (14).

In the following step S709, the turret 12 is rotated without cutting the separator sheets 2 and 3. As a result, one of the winding cores 13 (14) in the winding position P1 moves to the removal position P2 side while pulling out the separator sheets 2 and 3 from the separator supply mechanisms 51 and 61. On the other hand, the other winding core 14 (13) in the removal position P2 moves to the winding position P1 side in a state of being submerged in one table of the turret 12. Before the rotation of the turret 12, the shape of the other winding core 14 (13) is adjusted in advance to correspond to the bending amount of the electrode sheets 4 and 5 to be wound next.

Subsequently, in step S710, one of the wound cores 13 (14) of the various sheets 2 to 5 is rotated in accordance with the rotation of the turret 12.

Then, in the next step S711, the winding end process is executed. In the winding end processing, first, when the rotation speed of one winding core 13 (14) reaches a predetermined number, the rotation of one winding core 13 (14) is stopped. The rotation of the turret 12 is stopped before, at the same time as, or after the rotation of one of the winding cores 13 (14) is stopped.

When the rotation of one winding core 13 (14) and the turret 12 is stopped, one winding core 13 (14) that was in the winding position P1 is located in the removal position P2, and the other that was in the removal position P2. The winding core 14 (13) is in the winding position P1 (see FIG. 25). Further, at this time, the separator sheets 2 and 3 are hung on one of the support rollers 15a (15b) between the one winding core 13 (14) and the guide rollers 78a and 78b.

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

Prior to cutting the separator sheets 2 and 3, the other winding core 14 (13) protrudes from one table of the turret 12, so that the slit 143 (133) of the other winding core 14 (13) is separated. Sheets 2 and 3 are inserted. Further, after the separator sheets 2 and 3 are sandwiched by the chuck mechanism 142b (132b) or the like, the other winding core 14 (13) is rotated by a predetermined amount, so that the separator is formed on the outer periphery of the other winding core 14 (13). Sheets 2 and 3 are wound by a predetermined amount.

After cutting the separator sheets 2 and 3, one of the winding cores 13 (14) is rotated while the various sheets 2 to 5 are being pressed by the presser rollers 17. As a result, the end portions of the various sheets 2 to 5 are completely wound without being separated. After that, the end portion of the separator sheets 2 and 3 is wound by the fixing tape by the tape attaching mechanism 18, and the winding end process is completed.

Finally, in step S712, the chuck mechanism 132b (142b) contracts, the gripping of the separator sheets 2 and 3 is released, and then the battery element 1 is released from one of the winding cores 13 (14) by the removal device. Is removed to complete the winding process.

Prior to step S712, the energizing terminal 19 is brought into contact with the contact portion 135 (145) of one of the winding cores 13 (14) to supply a predetermined power to the actuator 843, and the movable core piece 82 is placed on the fixed core piece 81 side. The peripheral length of one of the winding cores 13 (14) may be reduced by approaching the core 13 (14) (see FIG. 26). In the present embodiment, the distance between the fixed core piece 81 and the movable core piece 82 can be minimized by rotating the camshaft 841 in a normal state by about half a turn. By reducing the peripheral length of one winding core 13 (14), the stress applied from one winding core 13 (14) to the battery element 1 (various sheets 2 to 5) located on the outer periphery thereof is reduced. The battery element 1 can be easily removed. The shape of the winding core 13 (14) is changed with respect to the energizing terminal 19 after the battery element 1 is removed while the energizing terminal 19 is in contact with the contact portion 135 (145). Power may be supplied.

As described in detail above, according to the present embodiment, the movable core piece 82 can be tilted by the tilt changing mechanism 84, and by tilting the movable core piece 82, the shapes of the winding cores 13 and 14 can be obtained. It can be a shape that tapers toward the tip side or a shape that tapers toward the tip side. Therefore, for example, one end edge in the width direction of the electrode sheets 4 and 5 wound around the tip end side of the winding cores 13 and 14 is the width of the electrode sheets 4 and 5 wound around the base end side of the winding cores 13 and 14. When the electrode sheets 4 and 5 are curved so as to be longer than the other end edge in the direction, the shape of the winding cores 13 and 14 is made into a tapered shape so that the winding cores 13 and 14 are wound around the winding cores 13 and 14. It is possible to prevent the edge portions of the electrode sheets 4 and 5 in the width direction from being displaced from the desired positions. On the other hand, for example, the other end edge in the width direction of the electrode sheets 4 and 5 wound around the base end side of the winding cores 13 and 14 is wound around the tip end side of the winding cores 13 and 14 of the electrode sheets 4 and 5. When the electrode sheets 4 and 5 are curved so as to be longer than one end edge in the width direction, the shape of the winding cores 13 and 14 is tapered so that when the electrode sheets 13 and 14 are wound around the winding cores 13 and 14. It is possible to prevent the edge portions of the electrode sheets 4 and 5 in the width direction from being displaced from the desired positions.

As described above, according to the present embodiment, even if the electrode sheets 4 and 5 have a shape defect, the positions of the electrode sheets 4 and 5 are displaced from each other when they are wound around the cores 13 and 14. Can be effectively suppressed from occurring. Therefore, it is possible to more reliably prevent the occurrence of unwinding in the obtained battery element 1. As a result, the quality of the product can be improved, and the electrode sheets 4 and 5 having a defective shape do not have to be discarded as defective products, so that the productivity can be improved and the manufacturing cost can be suppressed.

Further, the inclination of the movable core piece 82 is adjusted by the inclination angle control unit 94, the bending amount detection unit 93, and the like so as to have an appropriate inclination angle according to the bending amount of the electrode sheets 4 and 5. That is, the shapes of the winding cores 13 and 14 can be automatically changed according to the states of the electrode sheets 4 and 5. Therefore, it is not necessary to devote human resources or temporarily stop the device for changing the shapes of the winding cores 13 and 14. In addition, there is no need to perform troublesome, time-consuming and labor-intensive work. As a result, the productivity can be increased extremely effectively, and the manufacturing cost can be further reduced.

Further, the cam shaft 841 has a first cam portion 841a and a second cam portion 841b in which the distance from the rotation shaft to the outer peripheral surface is not constant, and due to the rotation of the cam shaft 841, both cam portions 841a, The movable core piece 82 can be tilted by varying the position of the portion (pressurized contact portion 822) pressed against 841b. As a result, the winding cores 13 and 14 can be relatively easily changed to a tapered shape or a tapered shape. Further, by rotating the cam shaft 841, not only one of the distal end side portion and the proximal end side portion of the movable core piece 82 but also the positions of both can be changed. Therefore, for example, it is possible to further expand the settable range regarding the inclination angle of the movable core piece 82.

In addition, since the pressure contact portion 822 is in a state of being pressed against the first cam portion 841a or the second cam portion 841b, the movable core piece 82 can be supported in a very stable state by the cam shaft 841. can. Therefore, it is possible to more reliably prevent the movable core piece 82 from being deformed (bending, twisting, etc.) when a winding tightening force is applied to the winding cores 13 and 14 due to the winding of the various sheets 2 to 5. .. As a result, the shapes of the winding cores 13 and 14 can be more reliably kept constant.

Further, since the fixed core piece 81 may be large enough to accommodate the camshaft 841 inside, the winding cores 13 and 14 can be downsized while realizing the shape changing function of the winding cores 13 and 14. Can be planned.

Further, since the movable core piece 82 is pressed against the cam shaft 841, the shapes of the winding cores 13 and 14 do not change unless the cam shaft 841 rotates. Therefore, it is not necessary to perform a step for maintaining the shape of the winding cores 13 and 14 constant, such as supplying electric power to the actuator 843 at any time, and the productivity can be further improved.

In addition, in the present embodiment, the winding cores 13 and 14 can be tapered by rotating the camshaft 841 to one side in a normal state (a state in which the fixed core piece 81 and the movable core piece 82 are parallel to each other). By rotating the camshaft 841 to the other side, the winding cores 13 and 14 can be made into a tapered shape. Therefore, the relationship between the rotation direction of the camshaft 841 and the shape change of the winding cores 13 and 14 becomes easy to understand, and it is possible to more easily adjust and set the shape change of the winding cores 13 and 14. Become.

Further, the guide 83 is provided at a position of the movable core piece 82 away from the winding portion of the various sheets 2 to 5. Therefore, it is possible to suppress the increase in size (larger diameter) of the winding cores 13 and 14, and it is possible to more reliably reduce the size of the winding cores 13 and 14.

In addition, the guide 83 supports the movable core piece 82 against the winding force. Therefore, it is possible to more reliably prevent deformation (bending, twisting, etc.) of the movable core piece 82 and increase / decrease in the inclination angle due to the winding force, and it is possible to more reliably maintain the shapes of the winding cores 13 and 14. ..

Further, in the present embodiment, as the guide 83, a cross roller guide in which the guide rod 831 and the slide rod 832 are arranged so as to be arranged along the rotation axis direction of the winding cores 13 and 14 is used. Therefore, the thickness of the guide 83 can be made smaller in the direction orthogonal to the rotation axis of the winding cores 13 and 14, that is, along the radial direction of the winding cores 13 and 14. This makes it possible to more effectively reduce the size of the winding cores 13 and 14.

Further, when the shaft portion 843a is rotated, power can be stably transmitted from the shaft portion 843a to the camshaft 841 via the worm 844a and the gear 844b. On the other hand, even if a force in the rotation direction is applied to the cam shaft 841 for some reason, the rotation of the gear 844b can be restricted by the self-locking by the worm 844a and the gear 844b, and eventually the cam shaft 841 is locked. Can be maintained in the same state. As a result, unintended rotation of the camshaft 841 can be effectively suppressed, and by extension, unintended changes in the shapes of the winding cores 13 and 14 can be prevented more reliably.

Further, since power is transmitted from the worm 844a to the gear 844b while reducing the rotation speed, the rotation angle of the gear 844b and thus the rotation angle of the camshaft 841 can be finely adjusted. As a result, the inclination angle of the movable core piece 82 can be finely adjusted, and the shapes of the winding cores 13 and 14 can be changed more finely.

In addition, since the actuator 843 is a motor with a brake, it is possible to regulate the rotation of the shaft portion 843a except when the electric power is not supplied, that is, when the shapes of the winding cores 13 and 14 are changed by the electric power supply. Therefore, it is possible to more reliably prevent the shaft portion 843a from rotating due to vibration during winding, and it is possible to more reliably prevent the shapes of the winding cores 13 and 14 from being unintentionally changed.

Further, the power supply to the actuator 843, that is, the shape change of the winding cores 13 and 14, is performed only when the winding cores 13 and 14 are stopped (when they are not rotating). Therefore, it is not necessary to provide a complicated device for supplying electric power to the actuator 843 when the winding cores 13 and 14 rotate. As a result, the device can be simplified and the cost related to the manufacture of the device can be reduced.

Further, in the present embodiment, electric power is supplied to the actuator 843 by the energizing terminal 19 and the contact portions 135 and 145. Therefore, the power supply mechanism for the actuator 843 can be realized by a very simple configuration. As a result, it is possible to more effectively reduce the cost related to the manufacture of the device.

In addition, the actuator 843 is provided only on the proximal end side of the winding cores 13 and 14. As a result, it is possible to more effectively reduce the cost related to the miniaturization of the device and the manufacture of the device.

Further, since the supported portion 85 is provided at the tip of the fixed core piece 81, when the movable core piece 82 is tilted in order to change the shapes of the winding cores 13 and 14, it is covered according to the tilt of the movable core piece 82. The situation that the support portion 85 moves does not occur. Therefore, the supported portion 85 can be supported in a stable state by the receiving portion. Further, it is not necessary to adjust the position of the receiving portion or replace the receiving portion according to the change in the position of the supported portion 85. Therefore, the device can be further simplified. In addition, maintenance and the like can be performed more easily.

Further, even when the movable core piece 82 is tilted, the sizes of the slits 133 and 143 are kept constant without change. Therefore, it is possible to more reliably prevent the arrangement of the separator sheets 2 and 3 with respect to the slits 133 and 143 from being hindered, and it is possible to further improve the operational stability of the device.

The content is not limited to the description of the above embodiment, and may be implemented as follows, for example. Of course, other application examples and modification examples not illustrated below are also possible.

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

Therefore, in the above embodiment, the cam shaft 841 includes two cam portions 841a and 841b, but one cam portion whose distance from the rotation shaft to the outer peripheral surface is not constant is one on the tip end side of the cam shaft 841. Only the tip end side portion of the movable core piece 82 may be pressed against the cam portion, while the proximal end side portion of the movable core piece 82 may be pressed against a portion other than the cam portion of the cam shaft 841. Of course, only one cam portion may be provided on the base end side of the cam shaft 841.

Further, in the above embodiment, both cam portions 841a and 841b are thinner than the portions having a circular cross section (parts other than both cam portions 841a and 841b) on the cam shaft 841, but both cam portions 841a, 841b may be thicker than the above-mentioned portion. In this case, deformation of the camshaft 841 due to a load from the movable core piece 82 or the like can be more reliably prevented, and the shapes of the winding cores 13 and 14 can be more reliably maintained.

Further, as shown in FIGS. 27 and 28, the inclination changing mechanism 86 has inclined portions 861a and 861b inclined with respect to the rotation axes of the winding cores 13 and 14 on the side surface, and the actuator 862 causes the rotation axis direction. A rod-shaped slide portion 861 that can be reciprocated along the line may be provided, and the movable core piece 82 (pressurized contact portion 822) may be pressed against the inclined portions 861a and 861b. In this case, the movable core piece 82 can be tilted by reciprocating the slide portion 861, and the winding cores 13 and 14 can be tapered or tapered. In FIGS. 27 and 28, a part of the fixed core piece 81 is omitted.

Further, as shown in FIGS. 29 and 30, the inclination changing mechanism 87 may include a worm shaft 871, a movable core piece support portion 872, and a half gear 873. The worm shaft 871 is rotatable by the operation of the actuator 874 and has the worm 871a at the tip end portion. The movable core piece support portion 872 supports the central portion of the movable core piece 82 along the rotation axis direction of the winding cores 13 and 14 in a rotatable state, and is formed so as to protrude from the fixed core piece 81 in this example. It is composed of columnar protrusions. The half gear 873 is formed on the outer periphery of a portion of the movable core piece 82 supported by the movable core piece support portion 872, and is meshed with the worm 871a. In FIG. 29, a part of the fixed core piece 81 is omitted. Further, FIG. 30 is an enlarged schematic cross-sectional view in which a part of the fixed core piece 81, the worm shaft 871 and the like are omitted in order to clearly show the movable core piece support portion 872.

By configuring the tilt changing mechanism 87 as described above, the actuator 874 is operated to rotate the worm shaft 871 so that the center of the movable core piece 82 becomes the rotation center and the winding cores 13 and 14 rotate. On the other hand, the movable core piece 82 can be tilted. Therefore, the tilt changing mechanism 87 can be realized by a simple configuration, and the cost related to the manufacture of the apparatus and the like can be reduced.

Further, in order to obtain the battery element 1 of a predetermined size, the electrode sheets 4 and 5 are wound when the various sheets 2 to 5 are wound with the peripheral length of the portion corresponding to the central portion of the winding cores 13 and 14 as the predetermined length. When the shapes of the winding cores 13 and 14 are changed according to the state of the above, it is not necessary to change the peripheral length of the portion corresponding to the central portion of the winding cores 13 and 14 as a reference. Further, the difference in peripheral length between the portion corresponding to the central portion of the winding cores 13 and 14 and the other portions can be made small. Therefore, even when the shapes of the winding cores 13 and 14 are changed, the battery element 1 of a desired size can be obtained more reliably and more easily, and the convenience of manufacturing the battery element 1 can be improved. Can be enhanced.

In the examples shown in FIGS. 29 and 30, the movable core piece 82 is tilted by rotating the half gear 873 by rotating the worm shaft 871, but of course, the camshaft 841 in the above embodiment is configured. The movable core piece 82 may be tilted by a method using the above. Further, the movable core piece 82 is supported in a rotatable state at the tip end side portion or the proximal end side portion, and the unsupported side portion of the movable core piece 82 is approached or separated from the fixed core piece 81. The 82 may be configured to be tilted.

Further, for example, as shown in FIG. 31, the direction in which the movable core piece 89 intersects the extending direction of the slit 133 (143) in the cross section orthogonal to the rotation axis of the winding core 13 (14) with respect to the fixed core piece 88 (for example,). , The movable core piece 89 may be configured to be tilted by moving along the direction of the black arrow in FIG. 31).

Of course, the shape of the winding core can be changed as appropriate. For example, in a cross section orthogonal to the rotation axis of the winding core, the outer circumference of the winding core may be configured to have a circular shape, an oval shape, a flat shape, or the like.

(B) In the above embodiment, the edge sensor 77 is provided at one place along the transport path of the electrode sheets 4 and 5, but is provided at a plurality of places along the transport path of the electrode sheets 4 and 5. It is also good. Then, the bending amount of the electrode sheets 4 and 5 may be calculated based on the detection result regarding the positions of the electrode sheets 4 and 5 in the width direction by each edge sensor.

(C) The shapes of both cam portions 841a and 841b in the above embodiment are examples, and as long as the movable core piece 82 can be tilted by the rotation of the cam shaft 841, the shapes of both cam portions 841a and 841b are used. It may be changed as appropriate.

(D) In the above embodiment, in the sheet position detection step, the position in the width direction in the entire area of the electrode sheets 4 and 5 for one element is detected. On the other hand, in the sheet position detection step, the position in the width direction in a part of the electrode sheets 4 and 5 for one element may be detected. For example, the position in the width direction in the portion located on the most downstream side or the intermediate side of the electrode sheets 4 and 5 for one element may be detected.

(E) In the above embodiment, the positions and bending amounts in the width direction are detected for the electrode sheets 4 and 5, and the shapes of the winding cores 13 and 14 are changed based on the detection results. On the other hand, the separator sheets 2 and 3 may be configured to detect the position and the amount of bending in the width direction and change the shapes of the winding cores 13 and 14 based on the detection result. Of course, the separator sheets 2 and 3 and the electrode sheets 4 and 5 may be configured to detect the position and the amount of bending in the width direction and change the shapes of the winding cores 13 and 14 based on the detection results.

(F) In the above embodiment, the spring 842 is used as the pressing means, but the pressing means may be any one that presses the movable core piece 82 against the outer peripheral surfaces of both cam portions 841a and 841b. Therefore, for example, the pressing means may be configured by a magnet or the like.

(G) In the above embodiment, the worm 844a attached to the shaft portion 843a is configured to be meshed with the gear 844b attached to the cam shaft 841. That is, the power transmission mechanism from the shaft portion 843a to the camshaft 841 is composed only of the worm gear 844 including the worm 844a and the gear 844b. On the other hand, a mechanism other than the worm gear (for example, a gear) may be provided in the power transmission mechanism from the shaft portion 843a to the cam shaft 841. Of course, it is not necessary to provide a worm gear in the power transmission mechanism.

(H) In the above embodiment, the chuck mechanisms 132b and 142b are configured to operate by expanding and contracting with air, but the configuration of the chuck mechanism can be changed as appropriate. Further, it may be configured so that the chuck mechanism is not provided.

(I) In the above embodiment, only the first core pieces 131 and 141 are provided with a function for changing the shape of the winding cores 13 and 14. On the other hand, for example, when the chuck mechanism is not provided, even if both the first core pieces 131 and 141 and the second core pieces 132 and 142 have a function for changing the shape of the winding cores 13 and 14. good. Further, even if at least one of the first core pieces 131 and 141 and the second core pieces 132 and 142 can be tilted with respect to the rotation axes of the winding cores 13 and 14, the shapes of the winding cores 13 and 14 can be changed. good. In this case, the first core pieces 131, 141 and the second core pieces 132, 142 that can be inclined with respect to the rotation axes of the winding cores 13 and 14 correspond to the movable core pieces.

(J) In the above embodiment, the correction angle a and the power supplied to the actuator 843 are determined based on the bending amount of the electrode sheets 4 and 5 before winding, but the electrode sheets 4 and 5 after winding are determined. Based on the bending amount (curving amount of the electrode sheets 4 and 5 in the obtained battery element 1), the correction angle a and the power supply may be determined to be used in the next and subsequent windings. That is, based on the bending amount of the electrode sheets 4 and 5 in the obtained battery element 1, the correction angle a and the supply power used in the next and subsequent windings may be feedback-controlled. The bending amount of the electrode sheets 4 and 5 after winding can be obtained, for example, based on the difference in height between the winding start portion and the winding end portion in the obtained battery element 1.

Further, for example, the bending amount of the electrode sheets 4 and 5 constituting the sheet original fabrics 32 and 42 may be measured in advance, and the correction angle a or the like may be determined based on the previously measured bending amount.

(K) In the above embodiment, the shape of the winding core 13 (14) is configured to be changed when the winding core 13 (14) is arranged at the removal position P2, but the winding core 13 (14) is the winding position P1. It may be configured to change the shape of the winding core 13 (14) at the stage of being arranged in. In this case, it is preferable to provide the energizing terminal 19 corresponding to the winding position P1.

(L) In the above embodiment, the movable core piece 82 can be automatically adjusted to an appropriate tilt angle by an actuator 843 or the like, but the tilt angle of the movable core piece may be manually adjusted. For example, the movable core piece can be locked in a non-rotatable state by a predetermined lock mechanism, while the movable core piece can be rotated at the base end portion by releasing the lock by the lock mechanism. .. That is, the movable core piece can be tilted with respect to the fixed core piece, and the tilted state of the movable core piece can be maintained constant by the lock mechanism. Then, in a state where the lock by the lock mechanism is released, the movable core piece is rotated so as to have an inclination angle suitable for the bending amount of the electrode sheets 4 and 5, and then the movable core piece is locked by the lock mechanism. The inclination angle of the movable core piece may be adjusted by manual operation. The inclination angle suitable for the bending amount of the electrode sheets 4 and 5 may be configured to be automatically obtained by the control device 91 based on the output result from the edge sensor 77.

(M) In the above embodiment, after the separator sheets 2 and 3 are wound to some extent, both electrode sheets 4 and 5 are supplied to the winding core 13 (14) by the sheet insertion mechanism 71. .. On the other hand, by gripping both the electrode sheets 4 and 5 together with the separator sheets 2 and 3 by the chuck mechanism 132b (142b) and starting the winding, the electrode sheets 4 and 5 are supplied to the winding core 13 (14). It may be configured so that the process is unnecessary. In this case, various sheets 2 to 5 are arranged in the slit 133 (143).

(N) In the above embodiment, the winding portion 11 is configured to include two winding cores 13 and 14, but the number of winding cores is not limited to this, and one or three. The configuration may be provided with the above winding core.

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

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

1 ... Battery element (winding element), 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding device, 13, 14 ... Winding core, 19 ... Energizing terminal, 77 ... Edge Sensor (seat position detecting means), 81 ... fixed core piece, 82 ... movable core piece, 83 ... guide, 84 ... tilt changing mechanism (tilting means), 85 ... supported part, 92 ... bending amount detecting part (curving amount detecting means) , 93 ... Tilt angle control unit (tilt angle control means), 133, 143 ... Slit, 135, 145 ... Contact part, 831 ... Guide rod, 832 ... Slide rod, 841 ... Cam shaft, 841a ... First cam unit, 841b ... Second cam portion, 842 ... Spring (pressing means), 843 ... Actuator (driving means), 843a ... Shaft portion, 844a ... Worm, 844b ... Gear, 872 ... Movable core piece support portion.

Claims (18)

A band-shaped sheet supplied to the winding core is wound by rotating a winding core provided with a movable core piece extending along the rotation axis direction while being rotatable on a predetermined rotation axis, and the sheet is rolled up. It is a winding device for manufacturing a winding element that is wound.
A tilting means for tilting the movable core piece with respect to the rotating shaft is provided.
By inclining the movable core piece with respect to the rotating shaft, the shape of the wound portion of the sheet in the winding core is gradually tapered toward the tip side and gradually toward the tip side. A winding device characterized in that it can be changed to a thicker shape. The sheet is a metal sheet and
A sheet position detecting means for detecting a position in the width direction of the sheet supplied to the winding core, and a sheet position detecting means.
A bending amount detecting means for detecting the bending amount of the sheet based on the detection result by the sheet position detecting means, and a bending amount detecting means.
A driving means capable of tilting the movable core piece by supplying electric power,
The first aspect of the present invention is provided with an inclination angle control means capable of adjusting the inclination angle of the movable core piece with respect to the rotation axis by controlling the drive means based on the detection result by the bending amount detecting means. Winding device. The winding core extends along the direction of the axis of rotation and includes a fixed core piece provided in a state of being aligned with the movable core piece.
The movable core piece is configured to be relatively movable along the directions of approaching and separating from the fixed core piece.
The tilting means
It is provided inside the fixed core piece in a state corresponding to almost the entire longitudinal direction of the movable core piece, and has a first cam portion and a second cam portion in which the distance from the rotation shaft to the outer peripheral surface is not constant, respectively. With a rotatable camshaft,
One of the tip end side portion and the proximal end side portion of the movable core piece is pressed against the outer peripheral surface of the first cam portion along the relative movement direction, and the outer peripheral surface of the second cam portion is pressed against the outer peripheral surface of the second cam portion. A pressing means for pressing the other of the distal end side portion and the proximal end side portion of the movable core piece along the relative moving direction is provided.
The winding device according to claim 2, wherein the driving means is configured to rotate the camshaft by being supplied with electric power. The movable core piece is configured to be able to be arranged in a state parallel to the fixed core piece.
In a state where the movable core piece and the fixed core piece are parallel to each other, by rotating the camshaft to one side, the shape of the winding portion of the winding core of the sheet gradually moves toward the tip side. It has a tapered shape, and by rotating the camshaft to the other side, the shape of the winding portion of the sheet in the winding core is configured to gradually taper toward the tip side. The winding device according to claim 3, wherein the winding device is provided. A guide that is attached to the fixed core piece and is tiltable with respect to the rotating shaft and supports the movable core piece in a state of being able to approach and separate from the fixed core piece is provided.
The winding device according to claim 3 or 4, wherein the guide is provided at a position of the movable core piece away from the portion where the sheet is wound along the direction of the axis of rotation. The guide is provided at least corresponding to the tip end portion and the base end portion of the movable core piece.
The guide supports the movable core piece against the winding force along the direction in which the movable core piece approaches and separates from the fixed core piece, which is applied to the movable core piece as the sheet is wound. The winding device according to claim 5, wherein the winding device is configured to be the same. The guide
A guide rod having a groove formed by two orthogonal planes while extending along a direction in which the movable core piece approaches and separates from the fixed core piece.
With a slide rod with multiple rotatable rollers arranged in an alternating orthogonal fashion,
A cross roller guide in which the rollers are arranged with respect to the grooves.
The winding device according to claim 5 or 6, wherein the guide rod and the slide rod are provided in a state of being arranged side by side in the direction of the axis of rotation. The drive means is a motor provided with a shaft portion that is rotated by electric power supply.
7. The winding device according to item 1. Any one of claims 3 to 8, wherein the drive means includes a shaft portion that rotates by supplying electric power, and is a motor with a brake that can regulate the rotation of the shaft portion when power is not supplied. The winding device described in. The winding device according to any one of claims 2 to 9, wherein the electric power supply to the driving means is configured to be performed only when the winding core is stopped. An energizing terminal for power supply configured so that it can be approached and separated from the winding core,
It is provided with a contact portion provided on the base end side of the winding core.
The winding according to any one of claims 2 to 10, wherein electric power is supplied to the driving means by contacting the energizing terminal with the contact portion. Device. The winding device according to any one of claims 2 to 11, wherein the driving means is provided only on the base end side of the winding core. The winding core extends along the direction of the axis of rotation and includes a fixed core piece provided in a state of being aligned with the movable core piece.
The tip of the winding core is provided with a supported portion that is supported by a predetermined receiving portion when the winding core rotates.
The winding device according to any one of claims 1 to 12, wherein the supported portion is provided at the tip end portion of the fixed core piece. The core is provided with a slit in which the sheet is placed.
The invention according to any one of claims 1 to 13, wherein the size of the slit is kept constant even when the movable core piece is tilted with respect to the rotation axis. Winding device. The tilting means includes a movable core piece support portion that rotatably supports a central portion of the movable core piece along the direction of the axis of rotation.
The winding device according to claim 1 or 2, wherein the movable core piece is configured to be tilted with respect to the rotation axis by rotating with the center portion as a rotation center. It is a method of winding a sheet used when winding a strip-shaped sheet to be supplied by a winding core provided with a movable core piece extending along the direction of the rotation axis while being rotatable on a predetermined rotation axis. ,
The movable core piece can be tilted with respect to the rotation axis, and by tilting with respect to the rotation axis, the shape of the wound portion of the winding core of the sheet is gradually tapered toward the tip side. It is configured so that it can be changed to a shape that gradually increases toward the tip side and a shape that gradually thickens toward the tip side.
By inclining the movable core piece with respect to the rotating shaft, the shape of the wound portion of the sheet in the winding core is gradually tapered toward the tip side or gradually advanced toward the tip side. The winding core shape change process to change to a fat shape, and
A method for winding a sheet, which comprises a winding step of winding the sheet by the winding core after the winding core shape changing step. The sheet is a metal sheet and
A sheet position detection step for detecting a position in the width direction of the sheet supplied to the core, and a sheet position detection step.
A bending amount detection step for detecting the bending amount of the sheet based on the detection result by the sheet position detection step, and a bending amount detection step for detecting the bending amount of the sheet.
Including an inclination angle calculation step of calculating the inclination angle of the movable core piece with respect to the rotation axis based on the detection result by the bending amount detection step.
The method for winding a sheet according to claim 16, wherein in the winding core shape changing step, the movable core piece is tilted with respect to the rotating shaft based on the tilt angle obtained by the tilt angle calculation step. A method for manufacturing a winding element, which comprises manufacturing a winding element in which the sheet is wound by using the method for winding a sheet according to claim 16.

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