CN115739548A - Swing-roller-free diaphragm coating machine for lithium battery and control method - Google Patents

Abstract

A lithium battery swinging-roller-free diaphragm coating machine and a control method thereof are provided, wherein the coating machine comprises a diaphragm, an unreeling device, a machine head, a discharging device, a reeling device, a data acquisition device and a control device; the diaphragm is output by the unwinding device and sequentially passes through the machine head, the discharging device and the winding device; the data acquisition device is arranged in the unwinding device, the machine head or the discharging device; the control device is electrically connected with the data acquisition device; the method comprises the following steps: setting a target tension value of a diaphragm, and calculating a preset torque according to the target tension value; acquiring a diaphragm tension value in real time, and calculating tension deviation values at multiple moments based on the target tension value; calculating a torque control increment according to the tension deviation values at the multiple moments; the invention realizes high-precision control by adjusting the tension of the diaphragm through the torque, realizes the adjustment of the contact angle of the diaphragm and each roller based on the swinging-free roller, greatly reduces the possibility of large wrap angle and avoids wrinkling.

Description

Swing-roller-free diaphragm coating machine for lithium battery and control method

Technical Field

The invention relates to the technical field of diaphragm coating machines, in particular to a swing-roller-free diaphragm coating machine for a lithium battery and a control method.

Background

At present, the general lithium battery diaphragm coating machine in the market all adopts the mode that the pendulum roller is used for tension control, controls tension through compressed air atmospheric pressure control cylinder thrust on the one hand, and on the other hand detects the speed of the motor that pendulum roller position control unreeled, pulled, rolled through potentiometre or position-sensing ware, uses PID regulation mode to make it stabilize in setting for the position, guarantees like this that the tension of diaphragm when the coating machine moves is invariable. The pendulum roller tension is in a pendulum structure, the contact angle between the pendulum roller and the diaphragm at the reeling and unreeling positions and the drawing positions of the coating machine is basically close to 180 degrees, wrinkles are easy to generate when the diaphragm with the dent, particularly the thickness of less than 7 microns passes through the roller with a large wrap angle, and the pendulum roller controls the tension to swing in a pendulum mode instead of linear motion, so that the tension output by the pendulum roller at different positions can be different, and the diaphragm tension control precision is greatly reduced.

Other coating machines on the market use a magnetic powder clutch to control tension, and although the mode does not need a swing roller, the magnetic powder clutch has low control precision and slow reaction speed and is not suitable for being used on a diaphragm coating machine.

Therefore, it is an urgent need to solve the problem of the art to provide a lithium battery swing-roller-free separator coater and a control method thereof to improve the tension control precision and the coating quality.

Disclosure of Invention

In view of the above, the invention provides a swing-roller-free diaphragm coating machine for a lithium battery, which can solve the problem that the diaphragm coating machine easily causes poor surfaces such as wrinkling and the like when a large wrap angle tape is threaded in a swing roller tension control structure, reduce the control difficulty requirement, provide a torque control mode and improve the control precision.

In order to achieve the purpose, the invention adopts the following technical scheme:

a lithium battery swinging-roller-free diaphragm coating machine comprises: the device comprises a diaphragm, an unreeling device, a machine head, a discharging device, a reeling device, a data acquisition device and a control device;

the diaphragm is output by the unwinding device and sequentially passes through the machine head, the discharging device and the winding device;

the data acquisition device is arranged in the unreeling device, the machine head or the discharging device;

the control device is electrically connected with the data acquisition device.

Further, the unwinding device comprises an unwinding roller, a first passing roller and a first connecting group roller, wherein the first passing roller and the first connecting group roller are arranged at the outlet end of the unwinding roller; the first roller passing is electrically connected with a first servo motor; the diaphragm is output to the machine head through the first roller and the first connecting group of rollers, and a contact angle between the diaphragm and the first roller and a contact angle between the diaphragm and the first connecting group of rollers is smaller than or equal to 90 degrees.

Furthermore, the data acquisition device is including installing unreel the ultrasonic sensor on the roller, ultrasonic sensor with controlling means electricity is connected for detect the coiled material diameter of unreeling on the roller.

Further, the machine head comprises a reference roller, a coating roller, a first middle roller and a second middle roller which are distributed on two sides of the coating roller, and a second passing roller which is arranged at the outlet of the machine head;

the reference roller, the first middle roller and the second middle roller are respectively connected with a second servo motor and a third servo motor; the second servo motor and the third servo motor are electrically connected with the control device;

the diaphragm is conveyed by the reference roller and sequentially passes through the first middle roller, the coating roller, the second middle roller and the second roller, and contact angles between the diaphragm and the coating roller, the first middle roller, the second middle roller and the second roller are all smaller than or equal to 90 degrees.

Further, the device also comprises a second connecting group roller which is used for connecting the first connecting group roller and the reference roller, wherein the second connecting group roller is used for adjusting the transmission angle of the diaphragm and enlarging the wrap angle of the diaphragm and the reference roller.

Further, the reference roller, the first intermediate roller and the second intermediate roller are respectively and correspondingly connected with a second servo motor, a third servo motor and a fourth servo motor; the second servo motor and the third servo motor are electrically connected with the control device.

Further, a flattening roller is arranged between the reference roller and the first middle roller, and is provided with a concave-convex surface for flattening the diaphragm.

Furthermore, the data acquisition device comprises a plurality of tension sensors, and the plurality of tension sensors are respectively arranged between the unwinding device and the machine head, between the machine head and the discharging device and between the discharging device and the winding device and are used for acquiring the tension of the diaphragm.

Furthermore, the data acquisition device comprises a plurality of ultrasonic sensors, and the ultrasonic sensors are respectively installed in the unwinding device, the discharging device and the winding device and used for acquiring the diameter of the coiled material.

And furthermore, the device also comprises a baking device, the diaphragm enters the baking device for drying after being coated by the machine head, and the dried diaphragm enters the discharging device.

A control method of a lithium battery swing-roller-free diaphragm coating machine comprises the following steps:

setting a target tension value of a diaphragm, and calculating a preset torque according to the target tension value;

acquiring a diaphragm tension value in real time, and calculating tension deviation values at multiple moments based on the target tension value;

and calculating a torque control increment according to the tension deviation values at the plurality of moments.

Further, the acquiring the tension value of the diaphragm in real time includes:

acquiring a diaphragm tension value between an unreeling device and a machine head;

acquiring a diaphragm tension value between a machine head and a discharging device;

and acquiring a diaphragm tension value between the discharging device and the winding device.

Further, the method comprises the following steps:

setting friction parameters and obtaining the diameter of the coiled material;

and calculating a motor torque value according to the target tension value, the friction force parameter and the diameter of the coiled material, and inputting the motor torque value into a servo motor.

Further, the diameter of the coiled material comprises the diameter of the coiled material of the unreeling roller, the diameter of the coiled material in the discharging traction roller and/or the diameter of the coiled material of the reeling roller.

The invention has the beneficial effects that:

according to the technical scheme, compared with the prior art, the swing-roller-free lithium battery diaphragm coating machine and the control method can solve the problem that the diaphragm coating machine has poor surfaces such as wrinkling and the like easily caused by belt threading at a large wrap angle required by a swing roller tension control structure, reduce the control difficulty requirement, provide a torque control mode and improve the control precision; the invention realizes the high precision of tension control and the stability under the high precision respectively through tension monitoring and coiled material diameter monitoring.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a lithium battery swing-roll-free diaphragm coating machine according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a tension control method provided in an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention discloses a lithium battery swing-roller-free separator coater, including: the device comprises a diaphragm, an unreeling device, a machine head, a discharging device, a reeling device, a data acquisition device and a control device;

the diaphragm is output by the unwinding device and sequentially passes through the machine head, the discharging device and the winding device;

the data acquisition device is arranged in the unwinding device, the machine head or the discharging device;

the control device is electrically connected with the data acquisition device.

In one embodiment, a display device, such as a touch screen; the touch screen is electrically connected with the control device and used for realizing human-computer interaction.

In one embodiment, the unwinding device comprises an unwinding roller, a first passing roller and a first connecting group roller, wherein the first passing roller and the first connecting group roller are arranged at the outlet end of the unwinding roller; the first roller is electrically connected with a first servo motor; the diaphragm is output to the machine head through the first roller and the first connecting group of rollers, and the contact angle between the diaphragm and the first roller and the first connecting group of rollers is less than or equal to 90 degrees.

Specifically, in fig. 1, the membrane is discharged from the unwinding roller, and then passes through a first connection group roller composed of a roller 1, a roller 2 and a roller 3, in the transmission moving process of the membrane, the contact angles of all the rollers and the membrane inside the unwinding device are smaller than or equal to 90 degrees through the transmission directions of the roller 1, the roller 2 and the roller 3 to the membrane.

And if the diaphragm adopts a swinging roller threading mode, the base material is opposite to the running direction of the diaphragm when the swinging roller is threaded to the roller, so that the contact angle between the swinging roller and the diaphragm is required to be more than 90 degrees, and the diaphragm is easy to wrinkle in the running process.

In this embodiment, the first servo motor controls the first passing roller to generate a torque opposite to the transmission direction of the diaphragm, the head reference roller conveys the diaphragm forward at a set speed in the operation process, the unwinding roller drum is dragged to rotate by the diaphragm when the force borne by the pulling force generated by the head reference roller is greater than the set tension value for unwinding, and the torque of the unwinding roller drum driving the servo motor is controlled by a Programmable Logic Controller (PLC) according to the set tension on a touch screen (human-computer interface) according to an open-loop mode or a closed-loop mode.

In one embodiment, the data acquisition device comprises a tension sensor, the tension sensor acquires the tension of the diaphragm, and the control device is combined to realize closed-loop mode control.

Specifically, the control device is a PLC, the unwinding mechanism is provided with a tension sensor to detect the physical quantity of unwinding tension of the diaphragm in real time and output the physical quantity to the PLC, the PLC converts the physical quantity detected by the unwinding tension sensor into an actual tension value, when the numerical value detected by the tension sensor deviates from the set tension value on the touch screen, the PLC adjusts the torque of a servo motor driven by the unwinding roller in real time through program operation to realize accurate tension control, the PLC compares the tension value set by the touch screen with a sampling value in real time through program operation to adjust the torque value driven by the unwinding roller in real time and outputs the torque value to a servo motor driver, and then the driver automatically controls the torque of the servo motor driven by the unwinding roller according to the physical quantity of the torque given by the PLC to generate accurate tension on the diaphragm, so that the unwinding tension of the diaphragm can be maintained in a high-precision constant-tension mode.

In another embodiment, a tension sensor is mounted in the head, in the outfeed, or in the take-up over the roller for detecting the diaphragm tension. Tension control of each stage of the diaphragm can be realized, tension detection of the diaphragm between the unreeling device and the machine head is realized by installing a tension sensor in the machine head through a roller, and the tension control is realized by combining a control device and an installed servo motor; through set up tension sensor in discharging device, realize that the inside roller of aircraft nose and the inside diaphragm tension that crosses between the roller of discharging device detect, combine controlling means and the servo motor who corresponds the installation to realize tension control.

In one embodiment, the data acquisition device comprises an ultrasonic sensor installed on the unwinding roller, and the ultrasonic sensor is electrically connected with the control device and used for detecting the diameter of the coiled material on the unwinding roller.

In the embodiment, the open-loop mode control is realized by combining the control device according to the diameter of the coiled material collected by the ultrasonic sensor.

The method is characterized in that an unreeling roller uses an ultrasonic sensor to detect the diameter of an unreeled coiled material in real time, the diameter of the unreeled coiled material is conveyed forwards all the time in the coating process, the diameter of the coiled material is gradually reduced along with the conveying process, the torque of a servo motor driven by the unreeling roller is adjusted in real time according to the diameter change of the unreeling roller through PLC (programmable logic controller) operation to realize accurate tension control, the PLC (programmable logic controller) operates the setting set on a touch screen through a program, (tension + friction force set on the touch screen) = the diameter of the unreeled coiled material = the torque value of the servo motor and outputs the torque value to the servo motor driver, then the driver automatically controls the torque of the servo motor driven by the unreeling roller according to the physical quantity given by the PLC (programmable logic controller) to generate accurate tension on a diaphragm, and the diameter of the roller is a linear variable, so that the torque value output to the servo motor through the program operation result is also linearly changed, and the base film avoids tension fluctuation caused by sensor signal interference or faults, and has a great protection effect on the diaphragm requiring low tension.

In another implementation, the ultrasonic sensor can be used for detecting the diameter of the coiled material in the unwinding device, the diameter of the coiled material in the discharging device or the diameter of the coiled material in the winding device or the combination of the two or more occasions, and the open-loop mode tension control in each structure is realized by combining with the program in the control device.

In one embodiment, the machine head comprises a reference roller, a coating roller, a first middle roller and a second middle roller which are distributed on two sides of the coating roller, and a second passing roller arranged at the outlet of the machine head;

the diaphragm is conveyed by the reference roller and sequentially passes through the first intermediate roller, the coating roller, the second intermediate roller and the second roller, and contact angles between the diaphragm and the coating roller, between the diaphragm and the first intermediate roller, between the diaphragm and the second roller are all smaller than or equal to 90 degrees.

The reference roller, the first middle roller and the second middle roller are respectively connected with a second servo motor, a third servo motor and a fourth servo motor; the second servo motor and the third servo motor are electrically connected with the control device. The reference roller is a roller 6, the roller 6 is driven by a second servo motor, and forward power is provided for diaphragm transmission of the whole machine through the second servo motor; the first intermediate roller, namely the roller 8, and the second intermediate roller, namely the roller 10, are respectively driven by a third servo motor and a fourth servo motor, so that tension control is realized, and the tension of the working areas of the first intermediate roller and the second intermediate roller is stable in the coating process; the roller 8 ensures that the angle between the diaphragm and the roller is changed in direction at the same time, so that the diaphragm vertically upwards contacts with the roller 9, namely an anilox roller, to coat, the roller 10 is an adsorption roller, and the tension of the diaphragm in a coating area is controlled; the coating roll, i.e., the over roll 9 is an anilox roll, and slurry is stuck to the anilox roll and contacts with the diaphragm to perform coating.

In another embodiment, the device further comprises a second connecting group roller for connecting the first connecting group roller and the reference roller, wherein the second connecting group roller is used for adjusting the transmission angle of the diaphragm and enlarging the wrap angle of the diaphragm and the reference roller.

Specifically, the second connecting roller is composed of a roller 4 and a roller 5, receives the diaphragm transmitted by the roller 3 and adjusts the angle, the roller 4 and the roller 5 are respectively contacted with two different surfaces of the diaphragm, the reference roller 5 and the roller 5 are also two different surfaces of the diaphragm, the contact angle between the diaphragm and the roller 5 is controlled within a range of less than or equal to 90 degrees through the angle adjustment of the roller 4, the diaphragm is transmitted to the reference roller from the roller 5, and the contact wrap angle between the diaphragm and the reference roller can be increased through the angle adjustment of the roller 5.

In another embodiment, a flattening roller is further arranged between the reference roller and the first intermediate roller, and the flattening roller is provided with a concave-convex surface used for flattening the diaphragm and avoiding wrinkles caused by large wrap angle conveying of the diaphragm on the reference roller.

In one embodiment, a baking device is arranged between the machine head and the discharging device, the diaphragm passes through a second roller, namely the roller 11, the roller 11 changes the direction while ensuring the angle between the diaphragm and the roller, and the diaphragm enters the baking device to be dried.

In the embodiment, after the dried diaphragm enters the discharging device, the diaphragm sequentially passes through a third connecting group of rollers consisting of a roller 12 and a roller 13 and is adsorbed by an adsorbing roller 14, wherein the roller 12 and the roller 13 increase the contact wrap angle of the diaphragm and the roller 14 by adjusting the angle of the diaphragm; the roller 14 controls the diaphragm tension of the roller 10 and the roller 14 directly through a connected fifth servo motor.

In another embodiment, after the diaphragm passes through the roller 14, the output angle of the diaphragm is adjusted through the roller 15 and output to the winding device, the roller 16 in the winding device ensures that the direction of the angle between the diaphragm and the roller is changed at the same time, the wrap angle of the roller 17 is ensured, and the roller 17 is a flattening roller and is used for ensuring the flatness of the diaphragm during winding; the roller 18 ensures that the angle between the diaphragm and the roller is changed in direction at the same time, and the angle of the rolling roller is ensured; and finally, the coated diaphragm is wound up by the winding roller in a rotating manner.

As shown in fig. 2, the invention further provides a control method of a lithium battery swing-roll-free diaphragm coating machine, which comprises the following steps:

s1: setting a target tension value of the diaphragm, and calculating a preset torque according to the target tension value;

s2, acquiring a diaphragm tension value in real time, and calculating tension deviation values at multiple moments based on a target tension value;

in one embodiment, collecting the diaphragm tension value in real time comprises: acquiring a diaphragm tension value between an unreeling device and a machine head; acquiring a diaphragm tension value between a machine head and a discharging device; and acquiring a diaphragm tension value between the discharging device and the winding device.

S3: calculating a torque control increment according to the tension deviation values at a plurality of moments;

in one embodiment, the specific control method is that the PLC calculates a deviation value E according to a target tension value SV set on the touch screen and a diaphragm tension value PV detected by a tension sensor, and then an incremental PID algorithm is adopted to calculate delta U = KP [ E (n) -E (n-1) ] + KI E (n) + KD [ E (n) -2E (n-1) + E (n-2) ]

Wherein, the delta U is an unreeling servo torque control increment; KP is a proportionality coefficient; KI is an integral coefficient; KD is a differential coefficient; e (n) is the current deviation value; e (n-1) is the deviation value calculated at the last moment; e (n-2) is the deviation value calculated at the first two moments.

The PLC program calculates a preset servo torque according to a set tension SV parameter set on the touch screen, and then outputs a result delta U = preset torque + the formula to a servo torque value. Wherein the PV is displayed on the touch screen in real time; the SV is provided with an input frame on the touch screen, so that a user can adjust the SV according to the process requirements; the KP is provided with an input box on the touch screen, so that a user can adjust the KP according to the process requirements; the KI is provided with an input box on the touch screen, so that a user can adjust the input box according to process requirements; KD has an input box on the touch screen to allow the user to adjust according to process requirements.

In another embodiment, the steps further comprise:

s4: setting friction parameters and obtaining the diameter of the coiled material;

in one embodiment, the web diameter includes the web diameter of the unwind roll, the web diameter within the outfeed pull roll, and/or the web diameter of the wind-up roll.

S5: and calculating a motor torque value according to the target tension value, the friction force parameter and the diameter of the coiled material, and inputting the motor torque value into the servo motor.

In another embodiment, each embodiment in this specification is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a lithium cell does not have pendulum roller diaphragm coating machine which characterized in that includes: the device comprises a diaphragm, an unreeling device, a machine head, a discharging device, a reeling device, a data acquisition device and a control device;

the diaphragm is output by the unwinding device and sequentially passes through the machine head, the discharging device and the winding device;

the data acquisition device is arranged in the unwinding device, the machine head or the discharging device;

the control device is electrically connected with the data acquisition device.

2. The lithium battery swing-roller-free diaphragm coating machine as claimed in claim 1, wherein the unwinding device comprises an unwinding roller, and a first passing roller and a first connecting group roller which are arranged at the outlet end of the unwinding roller; the first roller passing is electrically connected with a first servo motor; the diaphragm is output to the machine head through the first roller and the first connecting group of rollers, and a contact angle between the diaphragm and the first roller and a contact angle between the diaphragm and the first connecting group of rollers is smaller than or equal to 90 degrees.

3. The lithium battery swinging-roller-free diaphragm coating machine as claimed in claim 2, wherein the data acquisition device comprises an ultrasonic sensor installed on the unwinding roller, and the ultrasonic sensor is electrically connected with the control device and used for detecting the diameter of the coiled material on the unwinding roller.

4. The lithium battery swinging-roller-free diaphragm coating machine as claimed in claim 2, wherein the machine head comprises a reference roller, a coating roller, a first middle roller and a second middle roller which are distributed on two sides of the coating roller, and a second passing roller which is arranged at the outlet of the machine head;

the diaphragm is conveyed by the reference roller and sequentially passes through the first middle roller, the coating roller, the second middle roller and the second roller, and contact angles between the diaphragm and the coating roller, the first middle roller, the second middle roller and the second roller are all less than or equal to 90 degrees.

5. The lithium battery pendulum-free roller separator coater according to claim 4, further comprising a second connection group roller connecting the first connection group roller and the reference roller, wherein the second connection group roller is configured to adjust a transmission angle of the separator and to enlarge a wrap angle of the separator and the reference roller.

6. The lithium battery swinging-roller-free diaphragm coating machine as claimed in claim 4, wherein a flattening roller is further arranged between the reference roller and the first intermediate roller, and the flattening roller is provided with a concave-convex surface for flattening the diaphragm.

7. A lithium battery swinging-roller-free diaphragm coating machine control method is characterized by comprising the following steps:

setting a target tension value of a diaphragm, and calculating a preset torque according to the target tension value;

acquiring a diaphragm tension value in real time, and calculating tension deviation values at multiple moments based on the target tension value;

and calculating the torque control increment according to the tension deviation values at the plurality of moments.

8. The lithium battery swing-roll-free membrane coater control method as claimed in claim 7, wherein said collecting membrane tension values in real time comprises:

acquiring a diaphragm tension value between an unreeling device and a machine head;

acquiring a diaphragm tension value between a machine head and a discharging device;

and acquiring a diaphragm tension value between the discharging device and the winding device.

9. The lithium battery swing-roll-free diaphragm coater control method as claimed in claim 7, wherein the steps further comprise:

setting friction parameters and obtaining the diameter of the coiled material;

and calculating a motor torque value according to the target tension value, the friction force parameter and the diameter of the coiled material, and inputting the motor torque value into a servo motor.

10. The lithium battery swing-roller-free diaphragm coating machine control method as claimed in claim 8, wherein the coil diameter comprises a coil diameter of an unwinding roller, a coil diameter in a discharging traction roller and/or a coil diameter of a winding roller.

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