JP2003146538A - Winding method and winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding method and a winding device optionally controlling winding speed and flapping of material to be wound and capable of continuously winding with stable tension and of improving productivity and battery quality. SOLUTION: A flat winding core 11 for flat winding is supported by a winding core rotating part 20 and winds material to be wound 13 for an electrode or the like of for example a lithium ion polymer secondary battery with rotating in an arrow R direction. The winding core rotating part 20 moves on a flat surface P perpendicular to a rotating shaft 12 of the winding core 11 with synchronizing with a winding core 11. A moving direction can be at least one direction of for example a horizontal direction (X direction) and a vertical direction (Y direction). Since winding speed is constant and the material to be wound 13 is wound at positions of always fixed height if the winding core rotation part 20 moves in both directions of the horizontal direction and the vertical direction by designated amounts respectively, flapping is eliminated and tension during winding is fixed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a winding suitable for laminating and winding a positive electrode and a negative electrode via an electrolyte in a manufacturing process of a secondary battery such as a lithium ion polymer secondary battery and a lithium ion battery. The present invention relates to a winding method and a winding device.

[0002]

2. Description of the Related Art In recent years, portable electronic devices such as a notebook personal computer, a camera-integrated VTR (Videotape Recorder) or a mobile phone have appeared one after another, and their size and weight have been reduced. . Along with this, secondary batteries have been spotlighted as portable and portable power sources, and active research is being conducted to obtain higher energy densities. Under such circumstances, as a secondary battery having a higher energy density than an aqueous electrolyte secondary battery such as a lead secondary battery or a nickel-cadmium secondary battery, a lithium ion secondary battery using a non-aqueous electrolytic solution has been proposed. The practical application has started.

Conventionally, in a lithium ion secondary battery, a liquid electrolyte (electrolyte solution) in which a lithium salt is dissolved in a non-aqueous solvent has been used as a substance that controls ion conduction. Therefore, in order to prevent liquid leakage, it is necessary to use a metal container as an exterior member and strictly secure the airtightness inside the battery. However, if a metal container is used for the exterior member, it is extremely difficult to fabricate a thin and large-area sheet-type battery, a thin and small-area card-type battery, or a flexible and highly flexible battery. there were.

Therefore, a secondary battery has been proposed which uses a gel electrolyte in which a polymer material holds an electrolyte solution containing a lithium salt instead of the electrolyte solution. In this battery, since there is no problem of liquid leakage, a laminate film can be used for the exterior member, and further miniaturization, weight reduction and thickness reduction can be achieved, and a high degree of freedom in shape is realized. be able to.

In the manufacturing process of a lithium ion polymer secondary battery, for example, a positive electrode and a negative electrode are formed by coating a predetermined foil with a positive electrode active material and a negative electrode active material, respectively.
Then, the positive electrode and the negative electrode are caused to carry a gel electrolyte,
A positive electrode and a negative electrode are laminated via a separator, wound on a winding core, and cut into a required length to form a battery element. Tabs are ultrasonically welded to the positive electrode and the negative electrode of the wound battery element, and a tape or the like is fixed by heat sealing so that the wound electrode or the like cannot be unwound. Then, the battery element, after being inserted into the exterior member and sealed,
It is shipped after each process of heat pressing and aging.

The winding cores used in the winding step include a round winding core and a flat winding core. In the manufacturing process of a prismatic battery, a flat core may be used, although it may be wound with a round core and flattened by pressing. In a conventional winding process, an electrode or the like is wound by rotating a winding core around its center as a rotation axis. That is,
A round core is rotated about its center, and a flat flat core is rotated about its center in the width direction.

[0007]

In the conventional winding method as described above, in the case of a round core, the winding can be performed at a constant winding speed even if the core is rotated at a high speed at a constant speed. is there. However, in the case of winding on a winding core having a shape with different thickness and width such as a flat winding core, when the center of the winding core in the width direction is rotated about the rotation axis, the outer peripheral speed is different, and thus the winding speed is changed. That is, the flat surface has a low winding speed, and the thin side surface has a high winding speed. Therefore, conventionally, for example, the rotation speed of the winding core is changed by a servo motor to control the winding speed to be constant, but this method has a problem that the apparatus cost becomes very high.

FIG. 18 shows an example of a conventional winding operation of a flat winding core. The winding core 111 has a center in the width direction as a rotating shaft 112, and is denoted by reference numeral 11 from the initial position 111A.
Arrow R to each position indicated by 1B, 111C, 111D
The wound material 113 such as an electrode is wound while rotating in the direction indicated by. In such a winding operation, not only the winding speed changes, but also the height position at which the wound material 113 is wound changes with the rotation of the winding core 111, which causes the flapping 113F of the wound material 113. Occurs. The flapping 113F cannot be controlled by the conventional control method using a servomotor or the like.

Further, since the tension at the time of winding is different due to the fluctuation of the winding height position of the wound material 13, the wound material 123 can be applied with the same force over the entire circumference of the winding core 111. It cannot be rolled up, and it is tightly wound in one position and weakly wound in another position. If the winding tension is unstable as described above, it may cause distortion or deformation of the electrode in the manufactured secondary battery, which is not preferable.

Flapping 1 of the wound material 113
In order to eliminate 13F and enable winding at a fixed height position, the same applicant as the present applicant has proposed a slide turn winding method as shown in FIG. 19 (Japanese Patent Laid-Open No. 2001-5.
7242). According to this slide turn winding method, first, the winding core 111 is horizontally moved (slide) from the initial position 111E to the rotation start position 111F in the direction shown by the arrow S in FIG. Then, with one end of the winding core 111 as the rotation shaft 114, the initial position 1 is passed from the rotation start position 111F through each position indicated by reference numerals 111G and 111H.
Until it returns to 11E, it is rotated (turned) by 180 ° in the direction shown by arrow T in FIG. When the winding core 111 returns to the initial position 111E, the winding core 111 is horizontally moved again in the direction indicated by the arrow S. Thereafter, the wound material 113 is wound around the winding core 111 by repeating such a constant operation. Therefore, the center of the winding core 111 in the width direction draws a semicircular locus 112L.

With this slide turn winding method, the fluttering of the material 113 to be wound can be eliminated, but the winding speed is still unequal. Further, since winding is not performed while the winding core 111 is horizontally moved, continuous winding of the wound material 113 is impossible. Therefore, it takes a long time to wind up, and there is a problem in productivity.

The present invention has been made in view of the above problems, and an object thereof is to arbitrarily control the winding speed and fluttering of a material to be wound and to continuously wind the material with stable tension. The present invention provides a winding method and a winding device capable of improving productivity and battery quality.

[0013]

A winding method according to the present invention is for winding a wound material around a winding core,
A winding core rotating part for supporting the winding core and rotating the winding core is moved in synchronization with rotation of the winding core within a plane perpendicular to the rotation axis of the winding core. The moving direction of the core rotating unit may be at least two directions that are orthogonal to each other in the plane, for example, the horizontal direction and the vertical direction, or at least one of the two directions. As the core, any core other than a round core can be used, but it is particularly suitable for a flat core.

A winding device according to the present invention winds a winding core for winding a wound material, a winding core rotating part for supporting the winding core and rotating the winding core, and a winding core rotating part. And a drive unit capable of moving in synchronization with the rotation of the winding core in a plane perpendicular to the axis of rotation of the core.
The driving unit can move the winding core rotating unit in at least two directions orthogonal to each other in the plane, for example, a horizontal direction and a vertical direction, or at least one of the two directions. Such two-dimensional movement can be realized by configuring the driving unit with, for example, a cam or an actuator. As the winding core, any winding core other than a round core can be used, but it is particularly suitable for a flat winding core. Further, the winding core rotating unit can be configured to have, for example, a first gear that supports the winding core and an eccentric second gear that rolls on the first gear. In this configuration, the number of teeth of the second gear is set to 1/2 of the number of teeth of the first gear, and the drive unit synchronizes the first gear with the rotation of the winding core to cause eccentricity of the second gear. It is preferable to move it in the vertical direction by the amount.

In the winding method according to the present invention, the winding core rotating portion supporting the winding core is moved in a plane perpendicular to the rotation axis of the winding core in synchronization with the rotation of the winding core. Accordingly, even when the center of the winding core in the width direction is rotated about the rotation axis, the winding speed and fluttering can be freely controlled. Further, it is possible to wind at a constant speed without fluttering. By winding the positive electrode, the negative electrode, and the electrolyte of the secondary battery using the winding method of the present invention, productivity and battery quality can be improved.

In the winding device according to the present invention, the winding core rotating part for supporting the winding core is moved by the drive part in a plane perpendicular to the rotation axis of the winding core in synchronization with the rotation of the winding core. . The drive unit can be configured by a cam or an actuator, and in particular, by driving the cam, the rotation of the winding core and the cam can be mechanically synchronized. Further, for example, in the case of a flat core having a flat shape, the winding speed is slow on a flat surface and is high on a thin side surface, so that the winding speed of the winding core may be increased during one rotation. The slow speed change is repeated for two cycles. Therefore, the core rotating portion is eccentric to the second gear that rolls on the first gear that supports the core, and the number of teeth of the second gear is set to 1/2 of the number of teeth of the first gear. By doing so, the rotation speed of the first gear can be changed so that the winding speed becomes constant during one rotation of the winding core. Further, if the drive unit moves the first gear in the vertical direction by the amount of eccentricity of the second gear in synchronization with the rotation of the winding core, the material to be wound is always at a constant height position. Now it can be rolled up and the flutter is eliminated.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
2 schematically shows the winding device according to the embodiment of FIG. The winding device 10 shown in FIG. 1 is, for example, for forming a battery element by laminating a positive electrode and a negative electrode via a gel electrolyte in a manufacturing process of a lithium ion polymer secondary battery and winding the positive electrode and the negative electrode. Is used.

The winding device 10 is provided with, for example, a flat core 11 for flat winding, and a flat-plate-shaped core rotating portion 20 for supporting the core 11 and rotating the core 11. There is. The core rotating unit 20 can rotate the core 11 in the direction of arrow R in FIG. 1 with the center of the core 11 in the width direction as the rotation axis 12. For example, a strip-shaped wound material 13 is wound around the winding core 11. Wound material 13
Is a laminate of, for example, a positive electrode and a negative electrode for a lithium ion polymer secondary battery via a gel electrolyte, which is sent in the direction of arrow A and is rotated to a predetermined length or weight by the rotation of the winding core 11. It is rolled up until it reaches.

As shown in FIG. 1, the core rotating portion 20 has
In the plane P perpendicular to the rotation axis 12 of the winding core 11, for example, it is movable in the horizontal direction (X direction in FIG. 1) and the vertical direction (Y direction) in synchronization with the rotation of the winding core 11. Figure 2
Is synchronized with the rotation of the winding core 11 in the direction of the arrow R,
3 illustrates a winding operation of the winding core 11 when the winding core rotating unit 20 is moved in both the X direction and the Y direction.
3 and 4 show the X-direction displacement amount and the Y-direction displacement amount of the core rotating unit 20, which are necessary for causing the core 11 to perform the winding operation shown in FIG. 3 and 4, the actual amount of displacement of the core rotating portion 20 in the X and Y directions differs depending on the thickness and width of the core 11.

In the winding operation shown in FIG. 2, the winding core 11 is
Reference numerals 11B and 11 from the initial position 11A at the displacement angle of 0 °
Since the core rotating unit 20 is moved by a predetermined displacement amount in both the X direction and the Y direction in synchronism with the rotation until returning to the initial position 11A again after passing through the respective positions indicated by C and 11D, The fluttering of the winding material 13 is eliminated, and the winding speed becomes constant. Further, as shown in FIG. 2, the rotation axis 12 of the winding core 11, that is, the center of the winding core 11 in the width direction, draws a locus 12L formed by a symmetrical curve.

The core rotating unit 20 is arranged in the X direction and the Y direction.
It is also possible to move in only one of the directions. FIG. 5 illustrates a winding operation of the core 11 when the core rotating unit 20 is moved only in the X direction in synchronization with the rotation of the core 11 in the arrow R direction. The X-direction displacement amount in FIG. 5 is the same as that shown in FIG. 2 or FIG.

In the winding operation shown in FIG. 5, the winding core 11 is
Reference numerals 11F and 11 from the initial position 11E at the displacement angle of 0 °
The winding core rotating unit 20 is moved by a predetermined displacement amount only in the X direction in synchronism with the rotation until it returns to the initial position 11E after passing through the positions indicated by G and 11H, so that the winding speed is constant. However, since the winding height position of the material to be wound 13 moves up and down, flapping 13F occurs. Also,
The rotary shaft 12 of the winding core 11, that is, the center of the winding core 11 in the width direction, draws a linear locus 12LX in the horizontal direction.

On the other hand, FIG. 6 shows the winding operation of the winding core 11 when the winding core rotating portion 20 is moved only in the Y direction in synchronization with the rotation of the winding core 11 in the arrow R direction. It represents. The Y-direction displacement amount in FIG. 6 is the same as that shown in FIG. 2 or 4.

In the winding operation shown in FIG. 6, the winding core 11 is
Reference numbers 11L and 11 from the initial position 11K at the displacement angle of 0 °
Since the winding core rotating part 20 is moved by a predetermined displacement amount only in the Y direction in synchronization with the rotation through each position indicated by M and 11N until it returns to the initial position 11K again, the wound material 13 is It is always wound at a constant height position, and no fluttering occurs, but the winding speed becomes unequal. Also, the core 1
The center of the rotary shaft 12 of 1, ie, the width direction of the winding core 11, draws a linear locus 12LY in the vertical direction.

FIG. 7 shows an example of the drive unit 30 for moving the winding core rotating unit 20 as described above.
Is a front view and (B) is a right side view. The drive unit 30 is composed of a motor 21 fixed to the back surface of the core rotating unit 20 for rotating the core 11, and three linear sliders 31A, 31B, 31C connected to the core rotating unit 20. ing. Here, the core rotating portion 20 has a triangular shape, and the operating portions of the linear sliders 31A, 31B, 31C are in contact with the three vertices 20a, 20b, 20c thereof. That is, these linear sliders 31A to 31C
By controlling the stroke amount of No. 2 as shown in FIGS. 3 and 4, the core rotating unit 20 can be freely displaced in the X and Y directions.

In the present embodiment, the winding core rotating portion 20 is placed in the plane P perpendicular to the rotating shaft 12 of the winding core 11 so as to form the winding core 1.
Since it is moved in synchronization with the rotation of 1, the winding speed and fluttering of the material 13 to be wound can be freely controlled. In particular, if the material to be wound 13 is moved by a predetermined amount of displacement both in the horizontal direction (X direction) and in the vertical direction (Y direction), fluttering of the material 13 to be wound is eliminated, and a constant speed is always maintained at a constant height position. It is also possible to realize winding.
Therefore, it is possible to wind with stable and uniform tension, and when applied to the method of manufacturing a secondary battery, a high quality battery can be manufactured. Further, since it is not necessary to horizontally move the winding core as in the conventional slide turn method, continuous winding is possible and the productivity of the secondary battery is improved.

[Modification] A modification of the first embodiment will be described below. In the above-described embodiment, as the drive unit 30, the core rotating unit 20 is connected by the three linear sliders 31A, 31B, and 31C, and the linear slider 31 is used.
Although the configuration is such that the stroke amounts of A, 31B, and 31C are controlled, in this modification, as shown in FIG. 8, two flat plate-shaped core rotating portions 20A and 20B are provided. As the drive unit 30A, a linear slider 31E that is movable in the X direction (horizontal direction) is connected to the core rotating unit 20A, and a linear slider 31E that is movable in the Y direction (vertical direction) is connected to the core rotating unit 20B. The slider 31D is connected. With such a configuration, the linear sliders 31D, 3
By controlling the stroke amount of 1E as shown in FIGS. 3 and 4, the core rotating parts 20A and 20B can be moved in the X direction and the Y direction as in the first embodiment. In addition, the core rotating unit 20A includes the guide 2
2A and 22B are coupled to the core rotating unit 20B so as to be movable in the X direction (horizontal direction). The core rotating unit 20B is fixed by guides 22C and 22D so as to be movable in the Y direction (vertical direction) with respect to the wall surface.

Further, as shown in FIG. 9, the drive unit 30B is
The XY robot 33 is used instead of the linear slider, and the stroke amounts in the X and Y directions are controlled as shown in FIG. 3 and FIG. It may be moved in the X direction and the Y direction in the same manner as in the above embodiment.

Further, as shown in FIG.
C may be configured by using cams 34X and 34Y instead of the linear slider. Cams 34X, 34Y
The cam curve of is changed and connected to the core rotating parts 20A and 20B, respectively, and rotated around the rotating shafts 35X and 35Y. By mechanically synchronizing the rotation of the winding core 11 and the cams 34X and 34Y, the winding core rotating portions 20A and 20B can be moved in the X direction and the Y direction as in the first embodiment.

Further, as shown in FIG. 11 or 12, in the drive unit 30D, by using one or both of the links 36X and 36Y, the cam 34
It is also possible to provide X and 34Y on one axis and rotate them around a common rotary shaft 35. In the example of FIG. 11, the cam 3
4X is connected to the core rotating unit 20A via a link 36X, and the cam 34Y is directly connected to the core rotating unit 20B. In the example of FIG. 12, the cams 34X and 34Y are connected to the core rotating portions 20A and 20A via the links 36X and 36Y, respectively.
It is connected to B. In these configuration examples as well, by mechanically synchronizing the rotation of the winding core 11 and the cams 34X, 34Y, the winding core rotating portions 20A, 20B are moved in the X direction and the Y direction in the same manner as in the first embodiment. It can be moved.

[Second Embodiment] The second embodiment of the present invention will be described below.
The winding device according to the embodiment will be described. In addition,
In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the winding device 10A according to this embodiment,
As shown in FIGS. 13A and 13B, the core rotating unit 20
C is configured by using a gear 23A coaxially arranged with the winding core 11 and a gear 23B meshing with the gear 23A. The gear 23A is a linear motor guide 3 described later.
It is attached to 7. Further, the gear 23B is eccentric and rotates around the rotation shaft 24B. Also, the gear 2
The rotating shaft 24B of 3B has a gear 24C which is not eccentric.
Is provided. The gear 23B is the gear 24C, 23C.
Is connected to the motor 21 via the gears 2 and the rotational force of the motor 21 is transmitted via the gears 24C, 23C and 23B.
3A, the winding core 11 can be rotated in the arrow R direction with the center in the width direction as the rotation axis 12. The core 11 is attached to the winding device 10A by the core insertion block 25.

Although the gear 23A and the gear 23B actually mesh with each other as shown in the front view of FIG. 13B, they are omitted in the plan view of FIG. 13A. Further, in order to make the plan view of FIG.
4C and the gear 23C that meshes with the gear 4C are indicated by dotted lines. Further, in the front view of FIG. 13B, the gear 24C is shown by a dotted line.

FIG. 14 shows the gear 23 of the core rotating portion 20C.
It is a figure for demonstrating adjustment of the winding speed of the winding core 11 by A and 23B. When the flat winding core 11 is rotated at a constant rotation speed with the center in the width direction as the rotation shaft 12, the winding speed is slow on the flat surface 11P (see FIG. 14).
(A)), it becomes faster on the thin side surface 11S (FIG. 14).
(B)). The outer peripheral speed of the eccentric gear 23B is fast in the outer peripheral portion 23B1 far from the rotating shaft 24B (see FIG.
(A)), the outer peripheral portion 23B2 close to the rotary shaft 24B becomes slower (FIG. 14 (B)). Therefore, in the present embodiment, the winding speed of the winding core 11 is substantially constant by eccentricizing the gear 23B and synchronizing the slow change of the winding speed of the winding core 11 and the change of the outer peripheral speed of the gear 23B. The gear 23A is shifted so that

Here, as shown in FIGS. 15A and 15B, the distance between the rotary shaft 24B of the gear 23B and the center 24A,
That is, the eccentricity D1 of the gear 23B preferably satisfies D1 = D2 / 2, where D2 is the center of the winding core 11 in the width direction, that is, the distance from the rotating shaft 12 to the end of the flat surface 11P. By satisfying the above formula, the winding speed of the winding core 11 becomes substantially constant, and the fluttering of the wound material 13 becomes small. Also, if D1 is increased, the winding speed and fluttering increase. However, the width of the flat surface 11P is D3, and D2 = D3 / 2 is satisfied.

Further, while the winding core 11 makes one rotation, the slow speed change of the winding speed is repeated for two cycles. Therefore, in the present embodiment, when the number of teeth of the gear 23A is 1, the eccentricity is reduced. The number of teeth of the formed gear 23B is halved.
As a result, the gear 23A can be shifted in accordance with the cycle in which the winding speed of the winding core 11 changes slowly, and the winding speed can be kept constant.

FIG. 16 shows a winding device 1 according to this embodiment.
The winding operation of the winding core 11 by 0A is performed. The winding core 11 rotates in the arrow R direction and is displaced in this order to the respective positions shown in FIGS. 16 (A), (B), and (C). The linear motor guide 37 moves the gear 23A vertically by the eccentric amount D1 of the gear 23B in synchronism with the rotation of the winding core 11, so that the wound material 13 is always at a constant height position 13H. I'm trying to wind it up to 11. The linear motor guide 37 constitutes a drive unit 30F capable of moving the gear 23A in a plane perpendicular to the rotary shaft 12 of the winding core 11 in synchronization with the rotation of the winding core 11. There is.

As described above, according to the present embodiment, the core rotating portion 20C is configured to include the gear 23A and the eccentric gear 23B that meshes with the gear 23A, and the gear 23B has the number of teeth of the gear 23A. Since it is set to 1/2, the gear 23A can be shifted in accordance with the change in the winding speed during one rotation of the winding core 11, and the winding at a constant winding speed can be realized. Also,
Since continuous winding is possible, similar to the first embodiment,
If applied to the manufacturing method of a secondary battery, the productivity is improved.

Further, since the drive unit 30F, that is, the linear motor guide 37, moves the gear 23A in the vertical direction by the amount of eccentricity of the gear 23B in synchronization with the rotation of the winding core 11, the material 13 to be wound is wound. Will always be wound in a fixed position. Thereby, the wound material 13
The flapping is eliminated. Therefore, also in the present embodiment, as in the first embodiment, it is possible to wind with a stable and uniform tension, so that a high quality battery can be manufactured by applying the method to the secondary battery manufacturing method. it can.

In addition, since expensive equipment such as a conventional servo motor is not required to change the rotation speed of the gear 23A, the winding device 10A has high efficiency, low cost, and accuracy maintenance management. It is easy, and troubles will be reduced.

[0042]

FIG. 1 shows a concrete example of the present invention.
This will be described in detail with reference to FIG.

(Examples 1 and 2) First, a winding material 13 was obtained by laminating a band-shaped positive electrode and a negative electrode for a lithium ion polymer secondary battery with a separator interposed therebetween as a wound material 13. Winding was performed using the winding device 10A. At that time, the length of the wound material 13 was 400 mm, the rotation speed of the gear 23A was 7, the eccentric amount D1 of the gear 23B was 6.25 mm, and the stop position tension was 200 g.
The winding time was 5.5 seconds in Example 1 and 11 seconds in Example 2.

[0044]

[Table 1]

For Examples 1 and 2, fluctuations in tension during winding were examined. The results obtained are shown in Table 1.

As a comparative example to this embodiment, the gear 23
Winding was performed in the same manner as in Example 1 except that the amount of eccentricity of B was set to 0, and the fluctuation of tension was examined. The results obtained are shown in Table 1.

Embodiments 1 using the eccentric gear 23B
In No. 2, it was confirmed that the tension fluctuation was reduced as compared with the comparative example. In Example 2 in which the winding time was 11 seconds, Example 1 was set in 5.5 seconds.
Tension fluctuation was further reduced, and uniform winding was realized.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made. For example, the configuration and the like of the winding core rotating unit or the driving unit described in the above-described embodiments and modified examples are not limited, and may have other configurations. For example, in the modification using the cams 34X and 34Y of the first embodiment, actuator driving may be used instead of the cams.

Further, in the second embodiment, instead of the eccentric gear 23B, as shown in FIG. 17, it has an egg-shaped outer peripheral shape, and the gear is machined on the outer peripheral portion of this egg-shaped. If the gear 26 is used, fluctuations in tension can be absorbed, and winding can be performed with a constant tension.

Furthermore, in the above embodiment, the manufacturing process of the lithium ion polymer secondary battery has been described as an example, but the present invention can be applied to other secondary batteries such as a lithium ion secondary battery. It is possible, and the same excellent effect can be expected. The material to be wound is not limited to the electrode of the secondary battery, but other strip-shaped materials such as tapes or linear materials such as wires for coils can be used.

[0051]

As described above, the winding method according to any one of claims 1 to 4 or claim 5
According to the winding device according to any one of claims 13 to 13, the winding core rotating part supporting the winding core is synchronized with the rotation of the winding core in a plane perpendicular to the rotation axis of the winding core. Since it is configured to move, the winding speed and fluttering of the material to be wound can be freely controlled. Further, unlike the conventional slide turn method, it is not necessary to stop the winding and move the core horizontally, so that continuous winding is possible. Therefore, if applied to the method of manufacturing a secondary battery, the productivity can be improved.

Particularly, according to the winding method described in claim 2 or 3, or the winding device described in claim 6 or 7, the core rotating parts are at least orthogonal to each other in the plane. Since the material to be wound 13 is moved in two directions, for example, in the horizontal direction and the vertical direction, or in at least one of the two directions, it is possible to eliminate the fluttering of the material 13 to be wound and always achieve winding at a constant height position. it can. Therefore, it is possible to wind with stable and uniform tension, and a high-quality battery can be manufactured by applying the method to a secondary battery manufacturing method.

Further, in particular, claim 10 to claim 13
According to the winding device described in any one of 1 above, the winding core rotating unit includes a first gear that supports the winding core and an eccentric second gear that rolls on the first gear. Therefore, the rotation speed of the first gear can be changed with a simple configuration, and an expensive device such as a conventional servo motor is not required. Therefore, high efficiency, low price, and easy maintenance of accuracy,
It is possible to realize a winding device with very few troubles.

Particularly, according to the winding device of the eleventh aspect, since the number of teeth of the second gear is set to 1/2 of the number of teeth of the first gear, the winding is performed during one rotation of the winding core. It is possible to change the speed of the first gear according to the change in speed and realize the winding at a constant winding speed. Therefore, if it is applied to a method for manufacturing a secondary battery, continuous constant-speed winding can be performed, and productivity is improved.

Further, according to the winding device of the twelfth aspect, the driving unit moves the first gear in the vertical direction by the eccentric amount of the second gear in synchronization with the rotation of the winding core. Therefore, the material to be wound is always wound at a fixed position. This eliminates the flapping of the wound material. Therefore, it is possible to wind with stable and uniform tension, and a high-quality battery can be manufactured by applying the method to a secondary battery manufacturing method.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a winding device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a winding method by the winding device shown in FIG.

FIG. 3 is a graph showing the X-direction displacement amount of the core rotating unit shown in FIG.

FIG. 4 is a graph showing a Y-direction displacement amount of the core rotating unit shown in FIG. 1.

5 is an explanatory view of another winding method by the winding device shown in FIG. 1. FIG.

FIG. 6 is an explanatory view of another winding method by the winding device shown in FIG. 1.

7A and 7B are a front view and a right side view illustrating an example of a schematic configuration of a drive unit for moving the core rotating unit illustrated in FIG.

FIG. 8 is a front view and a right side view showing another configuration example of the drive unit.

9A and 9B are a front view and a right side view showing still another configuration example of the drive unit.

FIG. 10 is a front view and a right side view showing still another configuration example of the drive unit.

11A and 11B are a front view and a right side view showing still another configuration example of the drive unit.

12A and 12B are a front view and a right side view showing still another configuration example of the drive unit.

FIG. 13 is a plan view and a front view showing the configuration of a winding device according to a second embodiment of the present invention.

14 is a diagram for explaining the adjustment of the winding speed of the winding core in the winding device shown in FIG.

15 is a diagram for explaining an eccentric amount of an eccentric gear shown in the winding device shown in FIG.

16 is a front view for explaining a winding method by the winding device shown in FIG.

FIG. 17 is a front view showing a gear used in a modification of the second embodiment.

FIG. 18 is an explanatory diagram of an example of a conventional winding method.

FIG. 19 is an explanatory diagram of another example of the conventional winding method.

[Explanation of symbols]

10, 10A ... Winding device, 11 ... Winding core, 12, 24B ...
Rotating shaft, 13 ... Winding material, 20 ... Winding core rotating part, 21 ...
Motor, 23A, 23B, 23C, 24C, 26 ... Gear, 30A, 30B, 30C, 30D, 30F ... Drive unit, 31A to 31E ... Linear slider, 33 ... XY robot, 34X, 34Y ... Cam, 36X, 36Y ... Link , 37 ... Linear motor guide

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3F058 AA04 AB01 AC08 BB19 CA01                       DA01                 5H028 AA05 BB08 BB17 CC10 CC12                       HH00                 5H029 AJ14 AK00 AL00 AM00 AM16                       BJ14 CJ07 CJ28 CJ30

Claims (13)

[Claims] 1. A winding method for winding a material to be wound around a winding core, comprising: a winding core rotating part for supporting the winding core and rotating the winding core; A winding method characterized in that the winding core is moved in a plane perpendicular to the axis in synchronization with the rotation of the winding core. 2. The winding method according to claim 1, wherein the winding core rotating part is moved in at least two directions orthogonal to each other in the plane, or in at least one of the two directions. . 3. The winding method according to claim 1, wherein the winding core rotating unit is moved in at least one of a horizontal direction and a vertical direction within the plane. 4. The winding method according to claim 1, wherein a flat winding core is used as the winding core. 5. A winding core for winding the wound material, a winding core rotating part for supporting the winding core and rotating the winding core, and the winding core rotating part for rotating the winding core. And a drive unit that moves in synchronization with the rotation of the winding core in a plane perpendicular to the axis. 6. The drive unit is capable of moving the winding core rotating unit in at least two directions orthogonal to each other in the plane, or in at least one of the two directions. Item 5. The winding device according to Item 5. 7. The drive unit sets the winding core rotating unit in at least one of a horizontal direction and a vertical direction in the plane.
The winding device according to claim 5, wherein the winding device can be moved in any direction. 8. The winding device according to claim 5, wherein the drive unit has a cam or an actuator. 9. The winding device according to claim 5, wherein the winding core is a flat winding core. 10. The winding core rotating part has a first gear arranged coaxially with the winding core, and a second gear meshing with the first gear and having an eccentric shaft. The winding device according to claim 5, wherein: 11. The winding device according to claim 10, wherein the number of teeth of the second gear is 1/2 of the number of teeth of the first gear. 12. The drive unit moves the first gear vertically by an amount of eccentricity of the second gear in synchronization with rotation of the winding core. Winding device. 13. The winding device according to claim 10, wherein the second gear has an egg-shaped outer peripheral shape, and a gear is machined on the outer periphery of the egg-shaped.