JP2002270213A - Take-up method and take-up device of band element for flat electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a take-up method and a take-up device hat takes up uniformly the band element of a f alt electronic component by using a flat core. SOLUTION: The feeding device 5 that feeding a band element 2a, 2b is driven by a servomotor and the rotating angle of a core 4 that takes up the band element is detected by an angle detector. And by adapting the rotating speed of the servomotor of the feeding device 5 to the variation of the take-up speed caused by the displacement of the angle position of the core 4, the feeding speed of the feeding device 5 is adapted to the variation of the take-up speed of the band element 2a, 2b by the core 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding method for winding a band-shaped element such as an electrode sheet and a separator constituting a flat electronic component such as a flat capacitor or a flat battery on a flat core. It relates to a winding device.

[0002]

2. Description of the Related Art Conventionally, in a battery or a capacitor having flat electronic parts, as a method of winding a band-shaped element such as an electrode sheet or a separator, a band-shaped element wound on a cylindrical unwinding roll is used. A method is known in which a flat core is driven to rotate and wound on the core while applying a certain tension under the intervention of a dancer roller or the like, and a required amount is wound, cut, and then the core is removed.

As a means for pressing the band-shaped element wound around the core, there is known a technique in which a pressing roller elastically supported by a coil spring or the like is pressed against the band-shaped element.

[0004]

However, according to the above-mentioned conventional method, the displacement of the winding speed at the time of winding the strip element around the flat core is considerably larger than that at the time of winding around the cylindrical shaft. There are problems such as uneven winding caused by displacement of the winding speed, and difficulty in increasing the winding speed.

[0005] Further, in the above-mentioned conventional holding technique, there is a problem that uneven winding is caused due to bouncing due to rotation of the core.

Accordingly, an object of the present invention is to provide a winding method and a winding apparatus capable of uniformly winding a band-shaped element of a flat electronic component using a flat winding core.

[0007]

An object of the present invention is to provide a method of rotating a flat core and winding a band element around the core, and a winding speed of the band element by the core. This is achieved by a method for winding a band-shaped element for a flat-type electronic component, characterized in that the feed speed of the band-shaped element is made to follow the displacement of the band-shaped element.

[0008] It is preferable that the feed speed of the strip element is changed in accordance with the speed calculated from the rotation angle of the core.

By interposing an elastic member at the feed-side end of the strip-shaped element, a tensile force is applied to the strip-shaped element and an error between the winding speed and the feed speed can be absorbed by the elastic member. preferable.

It is another object of the present invention to provide an apparatus for rotating a flat winding core and winding a band-shaped element around the winding core, the winding motor for driving the rotation of the winding core, and the winding core. A feeding device for feeding the band-shaped element, and a feeding speed of the feeding device is made to follow a displacement of a winding speed of the band-shaped element by the winding core. This is achieved by a winding device.

The feeder is driven by a servomotor and includes an angle detector for detecting a rotation angle of the core. The servo of the feeder is controlled by a change in a winding speed caused by a change in an angular position of the core. It is preferable to make the rotation speed of the motor follow.

The feed device is a linear guide, and the linear guide has a tension chuck driven to be fed along the linear guide. The tension chuck includes a chuck portion for holding one end of the strip-shaped element, and a winding portion. It is preferable to provide an elastic member for absorbing an error between the take-up speed and the feed speed and applying a tension within a certain range to the band-shaped member.

Further, the above object of the present invention is an apparatus for rotating a flat core and winding a band-shaped element around the core, the cam rotating synchronously with a rotation axis of the core, A press roller for pressing the belt-shaped element wound around the core, wherein the cam is configured to move the press roller along the winding surface of the core when the core rotates. The present invention is achieved by a winding device for a flat-type electronic component strip-shaped element, which is formed to guide a roller.

Preferably, the cam is a flat grooved cam having a peripheral groove surrounding the periphery of the rotary shaft, and a shaft of a pressing roller is slidably supported in the peripheral groove.

[0015] It is preferable that the pressing rollers are disposed to face each other with the rotation center of the winding core interposed therebetween.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a configuration of a first embodiment of a winding device for a band-shaped element for a flat electronic component according to the present invention. The example shown in FIG. 1 is a winding device 1 for a lithium secondary battery, in which a band-shaped element 2a constituting a positive electrode material and a band-shaped element 2b constituting a negative electrode material
And a belt-like element 3 constituting a separator sandwiched between the belt-like element 2a and the belt-like element 2b.

The winding core 4 has a flat shape (plate shape) and is connected to a winding motor 4a. As the feeding device 5, for example, a known unwinding roller 5a or a linear guide 5b can be used. . One end of each of the strip-shaped elements 2 a and 2 b is connected to the core 4, and the other end is connected to the feeding device 5.
On the other hand, the belt-like element 3 constituting the separator has one end wound around an unwinding roller 5a constituting a feeder 5 ', and the other end passes through the winding core 4 in the middle.
Is connected to the linear guide 5b. This is due to the fact that in the case of a lithium secondary battery, the electrode material is strip-shaped, and the separator is long and wound.

The feed speed of the feed devices 5, 5 'is adapted to follow the displacement of the winding speed when the band elements 2a, 2b are wound by the winding core 4.

When the winding core 4 is rotating at a constant speed at an angular velocity ω with a winding radius r and the rotation angle of the winding core 4 is θ, the X direction (winding direction) component Vx of the winding speed is Generally, it is expressed by the following equation.

[0020]

(Equation 1)

Accordingly, the winding speed of the winding core 4 is given by the following equation (1).
Is displaced according to That is, the winding speed of the core 4 is
Is displaced in accordance with the speed corresponding to the absolute value of the sine component of the tangential speed of the winding edge of. Note that the winding radius r is preferably corrected because it increases with winding.

Therefore, the feed speed of the feed devices 5, 5 'is
Control is performed so as to follow the displacement generated by the above equation (1). Such control can be performed by servo control. For example, in the illustrated example, a servo motor is used as a drive source of the winding motor 4a and the feeding device 5, and the rotation angle of the winding motor 4a is detected by angle detection. A controller (not shown) detects the detected signal with a controller (not shown), and the detected signal is processed by a controller (not shown) to control the servo motor of the feeder 5 at a predetermined rotation speed. As the angle detector of the winding motor 4a, for example, a known angle detector such as a potentiometer, an encoder, or a resolver can be used.

The linear guide 5 constituting the feeding device 5
b is a tension chuck 6 driven along the guide.
The tension chuck 6 can include a chuck portion 6a that holds one end of each of the band-shaped elements 2a and 2b, and an elastic member 6b that elastically supports the chuck portion 6a.

As shown in the figure, the elastic member 6b can be a coil spring that supports the chuck portion 6a from both sides in the feeding direction, and absorbs a control deviation between the winding speed and the feeding speed. It also has the function of imparting the required tensile tension to the wire. The control deviation between the winding speed and the feed speed includes a deviation due to disturbance and a deviation due to an increase in the winding radius r shown in Expression (1).

The linear guide 5 constituting the feeder 5
For b, various structures such as a ball screw driving type and a timing belt driving type can be adopted. For example, in the case of the timing belt driving type, the radius of the pulley around which the timing belt is wound is denoted by R. if the rotational angular velocity omega _L of the servo motor of the linear guide 5b is

[0026]

(Equation 2)

The rotation is controlled by a command from the controller. In this case, the pulley radius R is constant.

The servo motor for driving the feed device 5 includes:
A speed detector such as a tacho generator is provided, and the detected speed (control amount) can be fed back to perform control so as to eliminate a control deviation generated between the target value of Expression (2).

Alternatively, the moving speed of the tension chuck 6 is detected, the difference between the speed signal sent from the controller to the servomotor of the feeder 5 is calculated, and the difference is amplified and fed back to the servomotor of the feeder 5. The rotation speed of the motor can be corrected.

The other feeding device 5 'of the strip element 3 includes an unwinding roller 5a, dancer tension applying means 51, a dancer roller 52, a potentiometer 53, and a cutter 54.
The dancer roller 52 swings by driving the cylinder 51 as shown by the imaginary line in the drawing, applies tension to the strip-shaped element 3 constituting the separator, and adjusts the swing angle of the dancer lever 55 that supports the dancer roller 52. The structure in which the swing angle is detected by the potentiometer 53 and the swing angle is adjusted so as to obtain a required tension is the same as that of the related art.
The control method for controlling the driving of a by a servo motor is different from the conventional method in that the same control as that of the above-described linear guide 5b is performed.

The unwinding roller 5a shown in the figure has a structure in which the strip-shaped element 3 constituting the separator is wound in a large amount, and the unwinding roller 5a employs a configuration in which the unwinding roller 5a unwinds a predetermined length and then cuts it with the cutter 54. Since the decrease cannot be ignored, for example, it is necessary to count the number of rotations n of the unwind roller 5a and correct the decrease. R ₀ radius initial value of unwinding rollers 5a, if the thickness of the strip-like element 3 constituting the separator and S _t, the radius Rn after n rotation,

[0032]

(Equation 3)

Therefore, if the angular velocity of the unwind roller 5a is ω _s and the equation (3) is substituted into the equation (2),

[0034]

(Equation 4)

The rotation angular velocity of the unwind roller 5a is controlled by the equation (4).

According to the first embodiment of the present invention in which the above-described configuration and control are performed, uniform winding is achieved by making the feeding speed follow the fluctuation of the winding speed caused by the flat core. It becomes possible to take up, and even when taking up at a take-up speed higher than the conventional take-up speed, the uniformity of take-up can be maintained.

Further, the elastic member provided on the tension chuck can absorb the control deviation and apply a required tension to the belt-shaped element.

Next, a second embodiment of the winding device according to the present invention will be described below with reference to FIGS. FIG.
Is a perspective view conceptually showing a main part of the second embodiment of the present invention,
FIG. 3 is an explanatory diagram for explaining an operation state of the second embodiment of the present invention.

As shown in FIG. 2, a cam 10 is directly connected to a rotating shaft 4b of the winding core 4, and a circumferential groove 10a is formed in the cam 10 so as to surround the rotating shaft 4b. The shaft 11a of the pressing roller 11 for pressing the belt-shaped member to be taken is slidably fitted in the circumferential groove 10a.

The pressing roller 11 can be moved only in a straight line direction by passing its shaft 11a through the slit portion 12 or the like. The pressing roller 11 is covered with a cylindrical portion 11b formed of resin. It is preferable that the pressing rollers 11 are disposed to face each other on a straight line with the rotation center of the winding core 4 interposed therebetween.

The circumferential groove 10a is, as shown in FIG.
Is formed in a substantially elliptical or substantially elliptical shape so as to guide the pressing roller 11 so that the pressing roller 11 moves along the winding surface of the winding core 4 during the rotation of.

According to the winding device of the second embodiment of the present invention having the above-described configuration, the pressing roller 11 is forcibly guided on the moving path along the winding surface of the winding core 4.
The pressing roller 11 does not bounce due to the rotation of the core as in the related art, and high-speed winding can be performed.

In the second embodiment, the cam is
Although only the flat groove cam has been described, it may be formed by a flat rib cam, a cylindrical groove cam, or a cylindrical rib cam. However, in the case of using a rib cam, it is preferable to form two ribs.

In the apparatus using the pressing roller 11 as described above, the winding speed may slightly deviate from the cosine curve of the above-mentioned equation (1). This will be described with reference to FIG.

FIGS. 4A to 4C show the band elements 2a (2b).
Or 3) is an explanatory diagram showing, in a time-series manner, a state in which winding is performed on the winding core 4 while pressing the pressing roller 11 with the pressing roller 11;
In the figure, reference numeral 15 denotes a guide roller. Due to the relationship between the pressing roller 11 and the guide roller 15, the winding speed (feed speed) has a curve as shown in FIG. In FIG.
The horizontal axis represents the rotation angle of the winding core 4 and the vertical axis represents the winding speed (= feed speed).

As a method for causing the feed speed of the feed device 5 to follow the speed displacement shown in FIG. 5, for example, the feed amount of the feed device 5 with respect to the rotation angle of the core 4 is actually sampled, and the sampled curve is obtained. Data can be traced. An example of the sampling method will be described below.

As shown in FIG. 6, the belt-like element 2a is actually set, and the servo motor of the feeding device 5 is set to be free.
3. The servo motor of the winding core 4 (the winding motor 4a) is equally divided into rotation angles of the winding core 4 in units of (180 ° / 40).
A winding amount of 5 ° is taken and a feed amount of 4.5 ° is calculated from a detection value from an angle detector provided in a servo motor of the feeding device 5 and recorded. Repeat this operation several times,
The strip-shaped element 2 wound up every time the core 4 rotates by 4.5 °
The average value of the winding amount (= feed amount) of a is taken.

The average feed amount obtained in 4.5 ° rotation units thus obtained is converted into a percentage with the longest feed amount being 100, and this is plotted on the vertical axis, and the angular position corresponding to the horizontal axis is plotted. The graph shown in FIG. 7 is obtained.
It can be seen that the graph shown in FIG. 7 is slightly deviated from the cosine curve shown by the above equation (1).

Each angular position of 4.5 ° is defined as i (i = 1,
2, 3,...), And the percentage of the feed amount (= winding amount) corresponding to the angular position i is Ki, the feed speed Vi at the angular position i is represented by the following equation (5). .

[0050]

(Equation 5)

Here, Vb is a reference speed, which is obtained as follows.

Time ta when the core is drawn at 4.5 °
Is

[0053]

(Equation 6)

Therefore, the amount of movement La when the core rotates 4.5 ° is:

[0055]

(Equation 7)

Since the amount of movement after the core has been rotated by 180 ° is 2r,

[0057]

(Equation 8)

Therefore, Vb is expressed by the following equation.

[0059]

(Equation 9)

In equation (5), correction terms α1, α
When you insert 2,

[0061]

(Equation 10)

Is obtained. Here, α1 is a correction term for increasing the speed as the winding core width increases with winding, and α2 is a curve of the ratio Ki as the winding core increases with winding. Is a correction term based on which becomes moderate.

Α2 can be expressed, for example, by the following equation (7).

[0064]

[Equation 11]

Here, C is a correction value (%) and is a value that increases in proportion to one rotation of the core. FIG. 8 shows a graph of the ratio Ki when C = 0% and when C = 50%. In FIG. 8, it can be seen that the curve of the ratio Ki becomes gentler as the correction value is larger.

Therefore, the servo motor of the feeder 5 is controlled by the above equation (6). In particular,
The servo motor (4a) of the winding core 4 is driven by the position command pulse signal, and the pulses detected by the position detector of the servo motor (4a) are counted by a counter. Drives the servo motor of the feeder 5 by the motor controller according to the following.

The pulses from the position detector provided on the servo motor of the feed motor 5 are counted by a counter, and after the winding is completed, the pulse is returned to a predetermined angular position.

By tracing the actual winding amount (= feed amount) in this way, winding with less error can be performed.

[0069]

As is apparent from the above description, according to the method and apparatus for winding a band-shaped element for a flat-type electronic component according to the present invention, the band-shaped element of the flat-type electronic component is formed into a flat core. Can be used for uniform winding.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a winding device for a flat type lithium secondary battery according to a first embodiment of the winding device according to the present invention.

FIG. 2 is a perspective view showing a main part of a second embodiment of the winding device for a band-shaped element for a flat battery according to the present invention.

FIG. 3 is an explanatory diagram for explaining an operation state of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining a state in which a belt-shaped element is wound in a second embodiment.

FIG. 5 is a graph showing a change in feed speed in the second embodiment.

FIG. 6 is a conceptual diagram showing a part of the device of the present invention.

FIG. 7 is a graph showing a feed rate of the second embodiment calculated from an actually measured value.

FIG. 8 is a graph for explaining a control method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding device 2a, 2b Strip element (electrode) 3 Strip element (separator) 4 Core 5 Feeding device 5b Linear guide 6 Tension chuck 6a Chuck part 6b Elastic member 10 Cam 10a Peripheral groove 11 Press roller 15 Guide roller

Claims (9)

[Claims] 1. A method for winding a band-shaped element around a flat core by rotating a flat core, wherein a feed speed of the band-shaped element is changed by a displacement of a winding speed of the band-shaped element by the core. A method for winding a band-shaped element for a flat-type electronic component, characterized in that the winding is performed. 2. The winding method according to claim 1, wherein the feeding speed of the belt-shaped element is changed corresponding to a speed calculated from a rotation angle of the core. 3. An elastic member is interposed at the feed-side end of the strip-shaped element to apply a tensile force to the strip-shaped element and to absorb an error between the winding speed and the feed speed by the elastic member. The method for winding a band-shaped element for a flat type electronic component according to claim 1, wherein: 4. An apparatus for rotating a flat core and winding a band-shaped element around the core, wherein the winding motor drives the core to rotate, and feeds the belt-shaped element to the core. And a device for causing the feed speed of the feed device to follow the displacement of the winding speed of the strip-shaped element by the core. 5. The feeding device is driven by a servomotor and includes an angle detector for detecting a rotation angle of the winding core. The feeding device is adapted to change a winding speed due to a displacement of an angular position of the winding core. 5. The winding device according to claim 4, wherein the rotation speed of the servo motor is made to follow. 6. The feed device is a linear guide, and the linear guide has a tension chuck driven to be driven along the linear guide.
A chuck portion for holding one end of the strip-shaped element, and an elastic member for absorbing an error between a winding speed and a feeding speed and applying a tension within a certain range to the strip-shaped member. Item 6. The winding device according to item 4 or 5. 7. A device for rotating a flat core and winding a band element around the core, comprising: a cam rotating synchronously with a rotation axis of the core; and a band element wound around the core. A press roller for pressing, wherein the cam is formed so as to guide the press roller so that the press roller moves along the winding surface of the core when the core rotates. A winding device for a band-shaped element for a flat-type electronic component, comprising: 8. The cam according to claim 1, wherein the cam is a flat grooved cam having a peripheral groove surrounding the periphery of the rotary shaft, and the shaft of the pressing roller is slidably supported in the peripheral groove. 8. The winding device according to 7. 9. The winding device according to claim 7, wherein the pressing rollers are arranged to face each other with the rotation center of the winding core interposed therebetween.