JP2018088411A - Spool tension control system of secondary battery manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spool control system of a secondary battery manufacturing apparatus for solving the problem of low responsiveness of a tension adjustment system of a conventional secondary battery manufacturing apparatus and the problem that change in diameter caused by winding-off is not reflected so that the system cannot be precisely controlled.SOLUTION: The spool control system of a secondary battery manufacturing apparatus includes: a spool that rotates a roll winding up materials of a secondary battery to wind off the materials and then supplies the materials to a winding-up part; a spool motor constituted to be able to adjust rotation speed of the spool; a flux sensor constituted to be able to measure a wound-off flux of the materials wound off; and a control part which controls the rotation speed of the spool motor so that the wound off flux can be adjusted corresponding to a decreased radius of the roll resulting from the winding off of the materials.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a spool tension control system of a secondary battery manufacturing apparatus, and more particularly, to maintain a constant tension of a material when a roll on which a material of a secondary battery electrode assembly is wound is unwound. The present invention relates to a spool tension control system.

  Generally, a secondary battery is a battery that can be repeatedly used through a charging process that is opposite to a discharge that converts chemical energy into electrical energy. In this type, a secondary battery is a nickel-cadmium (Ni-Cd) battery. A nickel-hydrogen (Ni-MH) battery, a lithium-metal battery, a lithium-ion (Ni-Ion) battery, a lithium-ion polymer battery (Li-Ion Polymer Battery, hereinafter referred to as “LIPB”), and the like.

  The secondary battery includes a positive electrode, a negative electrode, an electrolyte, and a separation membrane, and stores and generates electricity using a voltage difference between positive and negative electrode materials different from each other. Here, discharging means moving electrons from a negative electrode having a high voltage to a low positive electrode (generating electricity as the voltage difference between both electrodes), and charging means moving electrons from the positive electrode to the negative electrode again. At this time, the positive electrode material accepts electrons and lithium ions and returns to the original metal oxide. That is, when the secondary battery is charged, a metal atom moves from the positive electrode to the negative electrode through the separation membrane so that a charging current flows, whereas when discharged, the metal atom is transferred from the negative electrode to the positive electrode. And the discharge current flows.

  On the other hand, mass production is performed by winding and manufacturing the secondary battery. At this time, the tension acting on each material has a great influence on the battery quality, and the need to adjust the tension has arisen. Such a tension control device is disclosed in Korean Patent No. 1265196. However, in such a tension control device, the looper control and the tension control are simultaneously performed by one bar (BAR), so that the responsiveness is low, and inaccurate control is performed without considering the diameter change due to the unwinding of the material. There is a problem that is not suitable for high-speed production.

Korean registered patent No. 1265196

  The present invention relates to a spool control system of a secondary battery manufacturing apparatus for solving the problems of low responsiveness of a tension adjusting system of a conventional secondary battery manufacturing apparatus and a change in diameter due to unwinding that cannot be precisely controlled. The purpose is to provide.

  As a means for solving the above-mentioned problems, a spool that rolls and unwinds a roll on which a material of the secondary battery is wound, and is configured to be able to adjust the rotation speed of the spool and to supply the winding portion. A spool motor, a wire bundle sensor configured to measure the unwinding wire bundle of the material being unwound, and a spool so that the unwinding wire bundle can be adjusted in response to the reduced radius of the roll by unwinding the material A spool control system of a secondary battery manufacturing apparatus including a control unit that controls the rotation speed of a motor is provided.

  Here, the control unit is configured to receive the input of the target unwinding wire bundle, calculate the initial rotational speed of the spool motor based on the initial diameter of the roll, and drive the spool motor.

  Here, the wire bundle sensor is composed of an encoder that measures the unwinding wire bundle that moves after the material is unwound from the spool, and the control unit rotates the spool motor so that the unwinding wire bundle becomes the target unwinding wire bundle. Configured to control speed.

And an angle sensor configured to measure a rotation angle of the spool, and the diameter of the roll is
Is calculated by

In addition, the rotational angular velocity of the spool due to the change in roll diameter is
Is calculated by

  Meanwhile, the rotational speed is controlled by simultaneously sensing the tension value sensed from the tension measuring sensor acting on the material unwound from the spool and the reduced radius value of the roll.

  Moreover, it is comprised with a laser or an ultrasonic sensor so that the diameter of a roll can be measured.

  Furthermore, the dancer is further configured to apply a tension within a predetermined range after the material unwound from the roll is deferred, and the controller may rotate the spool motor by reducing the radius of the roll. And the rotational speed of the spool motor is controlled to change in accordance with the angle of the dancer changed by the tension acting on the material.

  Since the spool control system of the secondary battery manufacturing apparatus according to the present invention controls the rotation speed of the spool reflecting the reduced radius of the roll due to the unwinding of the material, precise control is possible. Further, since the diameter is calculated in advance and the rotation speed is controlled before measuring the change in the rotation angle of the dancer due to the tension change, the tension can be controlled at high speed and precisely. Therefore, there is an effect that the productivity and quality of the secondary battery can be improved.

It is a conceptual diagram with respect to tension control at the time of winding up a conventional secondary battery. 3 is a diagram illustrating a spool and a dancer of a spool control system according to the present invention; It is a perspective view of the spool module by this invention. It is a block diagram of the rotational speed control by this invention. It is a perspective view of a dancer type tension control device for adjusting the tension of a material. It is a graph which shows the target unwinding speed and spool rotational speed by a prior art and this invention.

  Hereinafter, a spool control 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 by other names in the industry. However, if these functional similarities and identities exist, even if the modified embodiment is adopted, it can be regarded as an equivalent configuration. Moreover, the code | symbol added to each component is described for convenience of description. However, the illustrated contents on the drawings in which these symbols are described do not limit the respective components to the scope in the drawings. Similarly, even if an embodiment in which the configuration on the drawing is partially modified is adopted, if there is a functional similarity and identity, it can be regarded as an equivalent configuration. In addition, when a general engineer in the technical field recognizes a component that should be included as a matter of course, a description thereof will be omitted.

  FIG. 1 is a conceptual diagram for tension control during winding of a conventional 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 separation membranes are overlapped in the order and wound. At this time, a plurality of materials are wound up by the rotation of the winding core portion, and the linear velocity of the materials by the rotation of the winding portion changes. This causes a larger deviation when the shape of the core is an ellipse or polygon that is not the original shape.

  On the other hand, each material is transferred from the spool 100 to the winding unit via different paths, and the wire bundle is controlled so as to be finally wound while maintaining an appropriate tension. The tension of the material can be generated due to the relative flux difference of each part in the continuous feeding process, therefore driving rollers etc. are provided on the path so that the appropriate tension can be maintained. A tension bar or the like is provided so that the wire bundle can be increased or the tension can be adjusted directly.

  FIG. 2 illustrates a spool 100 and a dancer of the spool 100 control system according to the present invention.

  The spool 100 module of the secondary battery manufacturing apparatus includes a spool 100, a spool motor 200, and a control unit 300. The spool 100 is configured such that the positive electrode plate, the negative electrode plate, and the separation membrane can each be placed in the form of a roll. When the secondary battery is manufactured, the raw material is supplied in the form of a roll so that it can be manufactured continuously and efficiently.

  When the production of the secondary battery is started, each material is unwound from the spool 100 in proportion to the amount wound by the winding unit. At this time, when only the tensile force pulling at the winding portion is applied, the material may be damaged by excessive tension acting before the material is unwound from the spool 100 due to the length of the material path. There is. Accordingly, the spool 100 is rotated so that the material is unwound while providing an appropriate tension. On the other hand, the raw material at this time can include a positive electrode plate, a negative electrode plate, and a separation membrane constituting the secondary battery assembly.

  FIG. 3 is a perspective view of a spool 100 module according to the present invention. As illustrated, the spool 100 module includes a spool 100, a spool motor 200, a line bundle sensor, an angle sensor, a plurality of idle rollers, and a control unit 300.

  The spool 100 is in the form of a roll, and is configured such that a wound material is stationary, and is formed so as to protrude in a direction perpendicular to the surface of the frame. At this time, a chuck is provided at the center so that the roll can be fixed and fixed at the time of rotation. On the other hand, when the roll is deferred, a sensor is provided so that an outer diameter that changes due to unwinding of the material can be measured.

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

  The wire bundle sensor is configured to measure the wire bundle when the material unwound from the spool 100 moves. A large amount of the material roll is wound up for continuous production, and the outer diameter is greatly reduced by the production of the secondary battery. Therefore, the difference between the rotational speed of the spool 100 and the wire bundle of the material to be unwound is caused by a large change in the outer diameter, and at this time, the speed of the material can be accurately measured. . On the other hand, the distance of the material moved from the specific time interval is derived through this.

  The angle sensor is configured so as to be able to measure an angular velocity or a rotation angle due to the rotation of the spool 100. For example, the angle sensor is configured by the absolute encoder 400 so as to be able to measure an absolute angle. On the other hand, such an angle sensor is only an example, and is applied in various configurations capable of measuring a relative angle during a certain time.

  The idle roller supports the material so that the material unwound from the spool 100 can move along the preset route. The idle roller can be moved while minimizing damage to the material by rotating together when the material is moved without a separate driving unit.

  The control unit 300 feeds back the values measured from the wire bundle sensor and the angle sensor, and controls the driving force of the spool motor 200 so that the material can move at the reference unwinding speed when the material moves. On the other hand, although not shown, the control unit 300 is configured by the master control unit 300 that performs such a function among the overall control unit 300 of the secondary battery manufacturing apparatus, or the slave control that controls only the spool module 10. The unit 300 is configured to perform this function.

  Hereinafter, functions of the control unit 300 of the spool 100 control system of the secondary battery manufacturing apparatus according to the present invention will be described in detail.

  FIG. 4 is a block diagram of rotational speed control according to the present invention.

  As shown in the figure, the control unit 300 receives the input of the target unwinding line bundle, calculates the difference between the moving speed of the current material measured from the line bundle sensor and the angle sensor, and the rotation speed of the spool 100 to be changed. Will be calculated.

  On the other hand, the current rotational speed of the spool 100 is sensed, and the amount of change in the rotational angular speed is calculated and reflected.

  Here, when the target unwinding line bundle is Vline, the angular speed of the spool 100 is ωspl, and the diameter of the spool 100 is Dspl, the angular speed Vspl that the spool 100 should have in order to unwind the material with the target unwinding line bundle is as follows. is there.

  At this time, the diameter gradually decreases due to the unwinding of the material from the roll, and the value of the diameter is calculated from the angle change of the laser sensor, the wire bundle, or the spool 100. On the other hand, the diameter is a distance from the rotation center of the spool 100 to the outermost shell surface of the material roll.

  When the diameter of the changed roll is measured by a laser sensor, the radius of the current roll is easily measured. Therefore, in the following, a method of calculating the radius of the current material by measuring the line bundle of the material and the angle of the spool 100 will be described. The explanation is as follows.

  With the unwinding of the material, the line bundle sensor calculates the difference in the accumulated movement amount between the previous step and the current staff.

  The difference in rotation angle between the previous step and the current staff is as follows.

  Note that the current diameter of the roll can be obtained by the following mathematical formula based on the relationship between the change angle of the roll and the wire bundle.

  Therefore, the rotation speed of the spool 100 for satisfying the target linear velocity by the change in the diameter of the roll is as follows.

  This is to control the rotational speed of the spool 100 in accordance with the change in the diameter due to the unwinding of the material before the rotational linear velocity is controlled by the tension acting on the material tension.

  As a result, even when various types and thicknesses of the material placed on the spool 100 are applied, the diameter reduced by the rotation angle and the material movement amount is calculated and reflected in the control. Therefore, the rotation speed of the spool 100 is sequentially increased by use, so that the same unwinding line bundle can be maintained. This eventually results in speed control that can keep the tension constant.

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

  On the other hand, if the tension is measured and a tension higher than the reference tension is measured, the rotational speed of the spool motor 200 is immediately increased to loosen the material, whereas if a tension lower than the reference tension is measured, the spool is immediately increased. Compensation control is performed in which the rotational speed of the motor 200 is decreased to tighten the material and increase the tension. Such a tension measuring sensor is composed of a dancer type as shown in FIG. 5, and when one side is fixed and the angle is controlled by pivot movement, if the dancer tilts to the spool 100 side, the tension becomes low. Reduce the rotation speed. Further, when the dancer leans to an angle away from the spool 100, the rotation speed of the spool 100 is increased because the tension is increased.

  Also in this case, the change in the flux due to the change in the rotation speed can be remarkably changed by using the material. That is, since the unwinding length with the same amount of rotation varies greatly between the initial stage and the final stage of the roll material, the rotation angle of the spool 100 must be controlled step by step by using the roll material. Therefore, when the change in diameter according to the present invention is calculated and used simultaneously with the tension control, more accurate tension control is performed. At this time, the rotational speed control by measuring the tension is executed through general PID control.

  In other words, when the change in tension is necessary by measuring the change in diameter first, and the change in tension is necessary, the follow-up performance of the target unwinding wire bundle is improved by controlling the rotation speed secondarily. To do.

  FIG. 6 is a graph showing the target unwinding speed and spool 100 rotational speed according to the prior art and the present invention.

  When the speed of the spool 100 is controlled by sensing only the angle change of a conventional dancer (a), and when the speed of the spool 100 is controlled by simultaneously measuring the tension and the diameter change of the roll according to the present invention (b) The unwinding speed and the rotation speed of the spool 100 are shown.

  As shown in FIG. 6A, when production is started, the rotational speed of the spool 100 increases so that the target unwinding speed, which is the moving speed of the material, can be followed. At this time, the rotational speed of the spool 100 also increases with the passage of time. This is because only the change in tension is measured, and the rotational speed is controlled by increasing or decreasing the tension. The fluctuation range is very large, and the oscillation cycle of the change in unwinding speed appears very short. Here, since the material is continuously supplied, the amount of change in the unwinding speed becomes the same as or similar to the tendency of the amount of change in tension. Therefore, the tension changes continuously and is frequently performed, which adversely affects the production quality of the secondary battery. In addition, when the material is connected to the winding unit and a continuous tension change occurs, the module that performs various operations other than the spool module 10 is also affected. Unnecessary resources are wasted.

  On the other hand, referring to FIG. 6B, the rotational speed of the spool 100 can be increased by performing a pre-compensation reflecting the diameter (radius) reduced by the use of the material. In this case, the wire bundle can be maintained constant. At the same time, when the rotational speed is controlled in response to a change in tension, the rotational speed already reflected is changed, the tension change cycle becomes longer, and the tension change width is also reduced. It becomes like this.

  The spool 100 control system of the secondary battery manufacturing apparatus described above reflects the change in diameter due to the use of the material in advance, thereby temporarily changing the rotation speed of the spool 100 to maintain a constant unwinding speed. Since the rotation speed can be changed secondarily in response to a change in the tension that changes instantaneously, and the material can be unwound while maintaining a constant tension, The quality can be greatly improved. Further, since the amount of change in tension of the material can be minimized even during high-speed production, there is an effect that productivity can be greatly improved.

DESCRIPTION OF SYMBOLS 10 Spool module 100 Spool 200 Spool motor 300 Control part 400 Encoder 410 Dancer Vline Target unwinding line bundle (mm / sec)
ωspl Spool basic angular velocity (deg / sec)
Dspl Spool diameter L 'Previous length of encoder or driving roller when calculating spool radius L' Previous current length of encoder or driving roller A 'Previous angle of spool when calculating spool radius (deg)
A ″ Angle of current spool (deg)

Claims (8)

A spool that rotates and unwinds a roll on which the material of the secondary battery is wound, and supplies it to the winding portion;
A spool motor configured to be capable of adjusting a rotation speed of the spool;
A flux sensor configured to measure an unwinding flux of the material being unwound; and
A spool for a secondary battery manufacturing apparatus, comprising: a controller for controlling a rotation speed of the spool motor so that the unwinding wire bundle can be adjusted in accordance with a reduced radius of the roll by unwinding the material; Control system.   2. The secondary according to claim 1, wherein the controller receives an input of a target unwinding wire bundle, calculates an initial rotational speed of the spool motor based on an initial diameter of the roll, and drives the spool motor. 3. Spool control system for battery manufacturing equipment. The wire bundle sensor is composed of an encoder that measures an unwinding wire bundle that moves after the material is unwound from the spool,
The spool control system of the secondary battery manufacturing apparatus according to claim 2, wherein the control unit controls a rotation speed of the spool motor so that the unwinding wire bundle becomes the target unwinding wire bundle. An angle sensor configured to measure a rotation angle of the spool;
The diameter of the roll is
The spool control system of the secondary battery manufacturing apparatus according to claim 2, wherein the spool control system is calculated by: The angular velocity of rotation of the spool due to the change in the diameter of the roll is
The spool control system of the secondary battery manufacturing apparatus according to claim 4, wherein the spool control system is calculated by:   6. The rotational speed is controlled by simultaneously sensing a tension value sensed from a tension measuring sensor acting on a material unwound from the spool and a reduced radius value of the roll. The spool control system of the secondary battery manufacturing apparatus as described.   The spool control system of the secondary battery manufacturing apparatus according to claim 2, wherein the spool control system includes a laser or an ultrasonic sensor so that the diameter of the roll can be measured. And further comprising a dancer configured to apply a tension within a predetermined range via the material unwound from the roll being deferred,
The control unit increases the rotation speed of the spool motor by reducing the radius of the roll,
The spool control of the secondary battery manufacturing apparatus according to claim 2, wherein control is performed so as to change a rotation speed of the spool motor in accordance with an angle of the dancer that is changed by a tension acting on the material. system.