KR101899992B1 - The tension control system for mandrel of manufacturing apparatus of rechargeable battery - Google Patents

Abstract

The present invention relates to a rechargeable battery including a core wound by winding a material of a secondary battery, a core motor configured to adjust a rotation speed of the core, a linear sensor configured to measure a winding speed of the material to be wound, And a control unit for controlling the rotation speed of the core motor so that the winding speed of the winding core can be controlled in accordance with an increasing radius.
The present invention provides a winding control unit system for a secondary battery manufacturing apparatus for solving the problem of low responsiveness of a tension control system of a conventional secondary battery manufacturing apparatus and a problem that a diameter change due to winding is not precisely controlled so that it can not be precisely controlled It is aimed at doing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tension control system for a rechargeable battery,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a winding tension control system for a secondary battery manufacturing apparatus, and more particularly to a secondary battery manufacturing method for controlling a tension of a secondary battery by controlling a rotation speed of a winding core, And more particularly to a tension control system for a winding part of a device.

Generally, a secondary battery is a battery which can be repeatedly used through a discharge process of converting chemical energy into electrical energy and a charging process in the reverse direction. Examples of the secondary battery include a nickel-cadmium (Ni-Cd) battery, a nickel- A lithium-metal battery, a lithium-ion (Ni-Ion) battery, and a lithium-ion polymer battery (hereinafter referred to as "LIPB ").

The secondary battery is composed of an anode, a cathode, an electrolyte, and a separator, and stores and generates electricity using voltage difference between different anode and cathode materials. Here, the discharge is to move electrons from a cathode having a high voltage to a cathode having a low voltage (generating electricity as much as the voltage difference of the anode), and charging means transferring the electrons again from the anode to the cathode where the anode material receives electrons and lithium ions And returned to the original metal oxide. That is, when the secondary battery is charged, the charge current flows as the metal atoms move from the anode to the cathode through the separator, and when discharged, the metal atoms move from the cathode to the anode and the discharge current flows.

On the other hand, mass production is carried out in such a manner that the rechargeable battery is manufactured by winding. In this case, the tension acting on each material at the time of winding has a great influence on the battery quality, so that it is necessary to control the tension. This tension control device is disclosed in Korean Patent No. 1265196. However, since the loop control and the tension control are simultaneously performed by a single bar (BAR), the tension control device is not suitable for high-speed production due to low response.

Korea Patent No. 1265196

The present invention provides a rewinder control system of a secondary battery manufacturing apparatus for solving the problem that a low responsiveness of a tension control system of a conventional secondary battery manufacturing apparatus and a diameter change caused by a rewinding are not reflected and thus can not be precisely controlled It is aimed at doing.

As a means for solving the above-mentioned problems, there has been proposed a spindle motor comprising a core wound around a secondary battery, a core motor configured to adjust a rotation speed of the core, a linear sensor configured to measure a winding speed of the material to be wound, And a control unit for controlling the rotation speed of the core motor so that the winding speed of the winding core can be controlled corresponding to an increasing radius as the core is wound on the secondary winding winding unit control system.

Here, the control unit may receive the target winding line speed, and may drive the core motor by calculating the initial rotation speed of the core motor according to the initial diameter of the core.

Also, the line speed sensor is constituted by an encoder for measuring the winding speed before the material is wound on the core, and the control unit can control the rotation speed of the core motor so that the winding speed becomes the target winding speed.

으로 계산될 수 있다.Here, it further comprises an angle sensor configured to measure the rotation angle of the winding core, wherein the winding core diameter

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Then, the control unit can control the core motor by measuring the radius that increases every time the core is rotated.

Furthermore, it can be composed of a laser or an ultrasonic sensor so that the diameter of the winding core can be measured.

On the other hand, the crimper may be configured to have a cross-sectional area of any one of a circle, an ellipse, and a polygon, and the control unit may be configured to control the rotation speed in accordance with the electronic cam profile upon rotation of the winding core.

The winding control unit of the secondary battery manufacturing apparatus according to the present invention can control precisely the rotation speed of the winding core by reflecting the increased radius of the electrode assembly due to the winding of the material, Since the rotation speed is controlled by calculating the diameter in advance before measuring each change, tension control can be performed precisely at high speed, so that productivity and quality of the secondary battery can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram relating to tension control at the time of winding a secondary battery.
2 is a view showing a spool and a dancer of the spool control system.
3 is a perspective view of the spool module.
4 is a block diagram of the rotational speed control of the spool.
5 is a perspective view of a dancer-type tension control device for adjusting the tension of a work.
6 is a graph showing a target unwinding speed and a spool rotation speed of the spool module.
7 is a partial enlarged view of a winding control system according to the present invention.
Figure 8 is a plan view of the winding according to the invention.
9 is a block diagram of a control system according to the present invention.
Fig. 10 is a graph showing the winding speed at the time of control and the rotation speed and tension of the core according to the present invention.
11 is a graph showing the plan view of the winding core and the winding speed of the winding core when the winding core is in the shape of a wobble.

Hereinafter, a winding control unit system of a secondary battery manufacturing apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the names of the respective components may be referred to as other names in the art. However, if there is a functional similarity and an equivalence thereof, the modified structure can be regarded as an equivalent structure. In addition, reference numerals added to respective components are described for convenience of explanation. However, the contents of the drawings in the drawings in which these symbols are described do not limit the respective components to the ranges within the drawings. Likewise, even if the embodiment in which the structure on the drawing is partially modified is employed, it can be regarded as an equivalent structure if there is functional similarity and uniformity. Further, in view of the level of ordinary skill in the art, if it is recognized as a component to be included, a description thereof will be omitted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram relating to tension control at the time of winding a secondary battery.

As shown in the figure, at the time of manufacturing the secondary battery, the positive electrode plate, the negative electrode plate, and the two separators are stacked in order and wound. At this time, as the core 510 is rotated, a plurality of workpieces are wound. At this time, the linear velocity of the workpiece 500 due to the rotation of the winding unit 500 can be changed. If the shape of the winding core 510 is an elliptical shape or a polygonal shape rather than a circular shape, a larger deviation occurs.

On the other hand, the respective materials are fed through different paths from the spool 100 to the take-up unit 500, and the linear velocity is controlled so as to be finally wound up while maintaining proper tension. The tension of the material can be caused by the difference in relative speed between the parts in the continuously supplied process. Therefore, the driving roller is provided on the path so as to maintain the proper tension, so that the linear velocity can be increased or the tension can be controlled A tension bar or the like may be provided.

2 is a view showing the spool 100 and the dancer of the spool 100 control system.

The spool (100) module of the secondary battery manufacturing apparatus may include a spool (100), a spool motor (200), and a spool controller (300). The spool 100 may be configured to mount the positive electrode plate, the negative electrode plate, and the separator in the form of rolls, respectively. When the secondary battery is manufactured, the material is supplied in the form of a roll so as to be continuously and efficiently manufactured, and used in manufacturing.

When the secondary battery is started to be produced, the spool (100) releases the respective materials in proportion to the amount of winding by the winding unit (500). In this case, when only the tensile force pulling from the take-up part 500 is applied, there is a fear that the material may be damaged due to an excessive tension acting before the spool 100 is loosened as the path of the material becomes longer. Accordingly, the spool 100 is rotated so that the material can be withdrawn while a proper tension is applied. Meanwhile, the material at this time may include a positive electrode plate, a negative electrode plate and a separator which constitute the secondary battery assembly.

3 is a perspective view of the spool 100 module. As shown in the figure, the spool 100 module may include a spool 100, a spool motor 200, a line speed sensor, an angle sensor, a plurality of idle rollers, and a spool controller 300.

The spool 100 is configured so that a material wound in a roll form can be mounted, and can be formed to protrude in a direction perpendicular to the plane of the frame. At this time, a chuck is provided at a central portion so as to be fixed when the roll is mounted and rotated. On the other hand, when the roll is stationary, a sensor may be provided to measure an outer diameter that varies depending on the material being unwound.

The spool motor 200 is connected to the spool 100 and is configured to transmit appropriate rotational force to the spool 100. The spool motor 200 is configured to rotate the spool 100 at an appropriate speed in accordance with an input of a spool controller 300 to be described later.

The linear velocity sensor is configured so that the material wound from the spool 100 can measure the linear velocity when moving. The linear velocity sensor is constituted by an encoder 400 or a drying roller so as to be able to measure the moving distance of the material. The material rolls are wound in large amounts for continuous production, and the outer diameter is greatly reduced as the secondary battery is produced. Therefore, the difference between the rotational speed of the spool 100 and the line speed of the material to be wound increases as the outer diameter increases, and the speed of the material is accurately measured. On the other hand, the distance of the moved material can be derived from the specific time interval.

The angle sensor is configured to measure an angular velocity or a rotation angle of the spool 100 according to the rotation of the spool 100. For example, the absolute encoder 400 may be configured to measure an absolute angle. On the other hand, such an angle sensor is an example, and can be applied to various configurations capable of measuring a relative angle for a predetermined time.

The idler roller supports the material so that the material unwound from the spool (100) can move along a predetermined path. The idler roller rotates together with the movement of the workpiece without a separate driving part, thereby moving the workpiece while minimizing damage to the workpiece.

The spool controller 300 feeds back the measured values from the wire speed sensor and the angle sensor and controls the driving force of the spool motor 200 so that the workpiece can be moved to the target unwinding speed as a reference when the workpiece is moved. Meanwhile, although not shown in the spool controller 300, the master spool controller 300 may be a master spool controller 300 that performs this function among all the spool controllers 300 of the secondary battery manufacturing apparatus, (300) may be configured to perform this function.

Hereinafter, the function of the spool control unit 300 of the control system of the spool 100 of the secondary battery manufacturing apparatus will be described in detail.

4 is a block diagram of the spool rotational speed control.

As shown in the figure, the spool control unit 300 receives the target winding line, calculates the difference between the movement speed of the current material measured from the line speed sensor and the angle sensor, and calculates the rotation speed of the spool 100 to be changed .

Meanwhile, the rotational speed of the spool 100 is sensed and the amount of change of the rotational angular velocity is calculated and reflected.

Herein, if the target winding line is Vline, the angular velocity of the spool 100 is? Spl, and the diameter of the spool 100 is Dspl, then the angular velocity Vspl of the spool 100 to deliver the material into the target winding line is Respectively.

At this time, as the material is unwound from the roll, the diameter gradually decreases, and the value of the diameter can be calculated from the change in angle of the laser sensor or the line speed and spool 100. Here, the diameter may be the distance from the center of rotation of the spool 100 to the outermost surface of the work roll.

In the following, a method of calculating the radius of the current material by measuring the line speed of the material and the angle of the spool 100 will be described below do.

As the material is unwound, the line speed sensor can find the difference between the previous step and the cumulative amount of movement at the current step.

In addition, the difference in rotation angle between the previous step and the current step is as follows.

From this, the current diameter of the roll can be obtained by the following equation according to the relationship between the angle of change of the roll and the line speed.

Accordingly, as the diameter of the roll is changed, the rotation speed of the spool 100 for satisfying the target linear velocity is as follows.

This is to control the rotation speed of the spool 100 in accordance with the change in diameter due to the unwinding of the material in advance, before controlling the line full speed according to the tension acting on the tension of the material.

As a result, even if the type and thickness of the material placed on the spool 100 are variously applied, the diameter reduced according to the rotation angle and the material movement amount is calculated and reflected in the control, The rotation speed is increased, and the same winding line can be maintained. This results in a speed control that allows the tension to remain constant.

5 is a perspective view of a dancer-type tension control device for adjusting the tension of a work. At this time, the material fed from the spool 100 passes through a predetermined path. At this time, a tension measuring sensor is provided to measure the tension acting on the work.

On the other hand, when the tension is measured and a tension higher than the reference tension is measured, the rotating speed of the spool motor 200 is immediately increased to loosen the material. On the contrary, if a tension lower than the reference tension is measured, The speed is decreased, and the material is tightened, so that the compensation control is performed to increase the tension. When the tension sensor is configured as a dancer type as shown in Fig. 5 and one side is fixed and the angle is controlled by the pivot movement, when the dancer is inclined toward the spool 100, the tension is lowered, The tension of the spool 100 is increased, and thus the rotation speed of the spool 100 is increased.

Even in this case, the change of the linear velocity due to the rotation speed change can be dramatically changed as the material is used. That is, since the length of the roll material to be wound around the same amount of rotation is greatly changed in the initial stage and the end stage of the roll material, the rotation angle of the spool 100 must be gradually controlled according to the use of the roll material. Therefore, when the change in diameter is calculated and used simultaneously with the tension control, more accurate tension control can be achieved. At this time, the rotation speed control according to the measurement of the tension can be performed through the general PID control.

In other words, when the change of the tension is required, the rotation speed is controlled to be changed secondarily to improve the tracking performance in the target winding line.

6 is a graph showing the conventional technique, the target unwinding speed, and the spool 100 rotation speed.

When the speed of the spool 100 is controlled by sensing only the angle change of the conventional dancer and when the speed of the spool 100 is controlled by simultaneously measuring the tension and the diameter change of the roll, And the rotational speed of the spool 100 are shown.

As shown in FIG. 6 (a), when the production is started, the rotation speed of the spool 100 is increased so as to follow the target unwinding speed which is the moving speed of the material. At this time, as the time passes, the rotational speed of the spool 100 also increases. This is because only the change of the tension is measured and the rotational speed is controlled in accordance with the increase or decrease of the tension, and the fluctuation width thereof is very large. Appears briefly. Here, since the material is fed continuously, the amount of change in the unwinding speed may be the same or similar to the tendency of the amount of change in tension. Therefore, the change of the tension is continuously large and frequent, which adversely affects the production quality of the secondary battery. In addition, since the material is connected to the winding unit 500, if a continuous change in the tension occurs, the module that performs various operations other than the spool module 10 is also affected, and resources unnecessary for the overall control can be wasted.

On the other hand, in FIG. 6 (b), the rotation speed of the spool 100 is compensated for the reduced diameter (radius) as the material is used, and the rotation speed can be increased. In this case, the linear velocity can be maintained constantly. At the same time, when the rotation speed is controlled in response to the change of the tension, there is a change in the rotation speed already reflected on the line, so that the period of the tension change becomes longer and the variation width of the tension decreases.

7 is a partial enlarged view of the control system of the winding unit 500 according to the present invention.

The winding unit 500 is constructed so that the respective materials can be rolled up in a predetermined order. The winding unit 500 may be manufactured in various thicknesses according to the specification of the secondary battery to be finally produced, and the winding shape may also be wound in the form of a circle, an ellipse, or a polygon. On the other hand, when the winding is performed at this time, the nonuniform tension described with reference to FIG. 1 may be applied, and the tension control for solving the problem may be performed.

The winder 500 can be configured in the form of a turret for continuous production. The winding unit 500 may include a winding 510, a winding core motor 520, a line speed sensor, an angle sensor, and a core 510 control unit. At this time, the line speed sensor may use the measurement value of the encoder 400 used for controlling the spool 100, and may be composed of a driving roller or an encoder 400 provided on a material movement path. In the meantime, the above-described components can perform similar functions to those of the components applied to the spool 100 module, so that a detailed description of each component will be omitted.

In Fig. 7, three winding rolls are provided, and independent processes are performed for each position according to the process. The winding may be performed in one position, and taping or the like may be performed in order to maintain the wound shape in another position. Meanwhile, the configuration of the winding unit 500 is merely an example, and can be modified and applied to various configurations having various functions.

The winding unit 500 controls the rotation speed to adjust the winding speed, thereby influencing the tension. In addition, since the material moves along the complicated path and the tension is changed at any time, a plurality of driving rollers may be provided to maintain the linear speed to maintain the tension. On the path of each material, a plurality of idle rollers are provided. The rollers are freely rotatable without a separate driving source. The number of the idle rollers and the position of the idle rollers can be variously applied, so that detailed description will be omitted.

Hereinafter, with reference to FIGS. 8 to 10, the control system of the winding unit 500 will be described in detail when the winding unit 500 is the circular winding unit 500. FIG.

Fig. 8 is a plan view of a core 510 according to the present invention, and Fig. 9 is a block diagram of a control system according to the present invention.

As shown in the figure, when the winding unit 500 is circular (a), the radius of the winding (c) increases as the winding unit 500 is wound up at the beginning of winding (b), and the winding linear velocity increases proportionally at the same rotation angle.

9, the winding control unit 530 receives the target winding speed, and the PID control can be performed so that the moving line of the current material is measured from the encoder 400 and the error is reduced. Then, when the required rotation speed of the core 510 according to the current diameter is determined, a control input is generated that finally determines the amount of rotation of the core motor 520 in comparison with the rotation speed of the current core 510.

Hereinafter, each step performed in the control step will be described in detail.

Herein, if the target winding velocity is Vline, the angular velocity of the core 510 is oospl, and the diameter of the core 510 is Dospl, the angular velocity oospl that the core 510 must have in order to wind the material with the target winding linear velocity, same. Here, the winding line wound in the spool 100 and the winding line wound in the winding core 510 may have the same value.

During the initial one rotation, the rotational speed of the core 510 is determined according to the outer diameter of the core 510 before the material is wound. Hereinafter, the rotational angular velocity of the core 510 reflecting the diameter including the material wound around the core 510 of the material and the target winding linear velocity is as follows.

At this time, as the material is unwound from the roll, the diameter gradually decreases, and the value of the diameter can be calculated from the change in angle of the laser sensor or the linear velocity of the core 510. Here, the diameter may be the distance from the center of rotation of the spool 100 to the outermost surface of the work roll.

Since the radius of the current roll can be easily measured when the diameter of the changed roll is measured by the laser sensor, a method of calculating the radius of the current material by measuring the line speed of the material and the angle of the core 510 will be described below do.

As the material is wound, the line speed sensor can find the difference between the previous step and the cumulative amount of movement at the current step.

In addition, the difference in rotation angle between the previous step and the current step is as follows.

From this, the current diameter of the wound electrode assembly in accordance with the relationship between the angle of change of the roll and the line speed can be obtained by the following equation.

Accordingly, as the diameter of the electrode assembly is changed, the rotation speed of the core 510 to satisfy the target linear velocity is as follows.

10 is a graph showing the winding speed at the time of control and the rotational speed and tension of the core 510 according to the present invention. The graph shown may be somewhat exaggerated for clarity.

As shown in Fig. 10 (a), unlike the spool 100 in which a large amount of material is wound, winding and taping, moving, and the like are performed in the winding unit 500,

Unlike in the spool 100, in the winding unit 500, the positive electrode plate, the negative electrode plate, and the two separation membranes can be wound together, and the increase in diameter due to the rotation can be more pronounced than the tendency to decrease in diameter of the spool 100.

At this time, the target winding speed may be composed of an initial acceleration section, an intermediate speed section, a constant speed section, and an end speed reduction section. In this case, since the diameter of the winding core 510 increases as the winding speed increases, the winding speed of the winding core 510 is greatly affected by the constant speed section and the final deceleration section, as shown in FIG. 10 (b).

When the rotation speed of the core 510 is controlled as described above, it is possible to minimize the change in the tension within one manufacturing cycle, as shown in FIG. 10 (c).

11 is a graph showing a plan view of the core 510 and a rotation speed of the core 510 when the core 510 has an erratic shape. The graph shown may be somewhat exaggerated for clarity.

As shown in the figure, in the case where the winding core 510 is an oval type or a similar polygon, the linear velocity can be greatly changed according to the rotation angle, and therefore, the tension can be greatly changed.

At this time, the rotation speed of the core 510 is applied using the electronic cam profile. (I) In this case, if the rotation speed is not changed in accordance with the amount to be wound, Changes are made. Therefore, the rotation speed is firstly controlled according to the electronic cam profile, and then the rotation speed is delayed secondarily by reflecting the increase of the outer diameter by the electrode assembly wound in the winding core 510, so that the winding can be performed at a constant tension have.

As described above, the winding control system of the secondary battery manufacturing apparatus according to the present invention controls rotation speed by reflecting the increased outer diameter as it is wound, so that the tension can be precisely adjusted and applied. And the control can be performed rapidly even when the control is performed at a high speed, so that the productivity can be greatly improved.

10: Spool module
100: spool
200: Spool motor
300: spool control unit
400: Encoder
500:
510: Reason
520: Core motor
530:
Vline: Target winding line speed (mm / sec)
wspl: Default angular velocity of the spool (deg / sec)
Dspl spool diameter
L ': Progressive length of the material in calculating the previous spool radius
L ": Progression length of current material
A ': Angle of winding (deg) in calculating the previous spool radius
A ": Angle of current spool (deg)
Vline: Target winding line speed (mm / sec)
ωang: basic angular velocity (deg / sec)
Do: Core diameter
Lo ': Length of progress of material in calculation of previous core radius
Lo ": Current length of the review
Ao ': Angle (degrees) of the previous core radius calculation.
Ao ": The current angle of rotation (deg)

Claims (7)

A core for winding the material of the secondary battery;
A core motor configured to adjust a rotation speed of the winding core;
A linear velocity sensor configured to measure a winding line speed of a material to be wound; And
And a control unit for controlling a rotation speed of the core motor so that the winding wire speed can be adjusted corresponding to an increasing radius of the material as the core is wound on the core,
Wherein,
The target winding speed is inputted,
And a control unit for controlling the winding unit to be driven including a section for gradually controlling the rotation speed of the winding core as the material is wound so that the material of the secondary battery can be wound around the target winding wire, Control system .. The method according to claim 1,
Wherein the control unit receives the target winding line speed and calculates an initial rotation speed of the winding core motor according to an initial diameter of the winding core to drive the winding core motor. 3. The method of claim 2,
The line speed sensor is constituted by an encoder for measuring the winding speed before the material is wound on the core,
Wherein the control unit controls the rotation speed of the core motor so that the winding wire speed becomes the target winding wire speed. 3. The method of claim 2,
Further comprising an angle sensor configured to measure a rotation angle of the winding,
The diameter of the winding

Of the secondary winding of the secondary battery. 5. The method of claim 4,
Wherein,
And the winding motor is controlled by measuring a radius that increases with each revolution of the winding core. 3. The method of claim 2,
And a laser or an ultrasonic sensor for measuring the diameter of the winding core. 3. The method of claim 2,
Wherein the crimping is constituted by a cross-sectional area of any one of a circle, an ellipse, and a polygon,
Wherein the control unit controls the rotation speed in accordance with the profile of the electronic cam during rotation of the winding core.

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