What is the principle and structure of tension control system of lithium battery winding machine?

In order to control tension, a tension control system needs to be formed. Because tension can only be formed between two(or more) process equipment with driving(or braking) torque, the tension control system is based on two transmission control systems. One of the transmission control systems serves as the speed benchmark of the tension control system, which is called the speed reference system, while the other transmission control system establishes the load according to the tension requirements to form the tension. The essence is to follow the speed of the speed reference system according to the required tension. It is called a tension-controlled speed following system. Tension control tasks are generally placed on the latter system, so people are accustomed to refer to the latter as a tension control system. This paper introduces the Zhanglizhangli control system of lithium battery winding machine.

Structure of Tension Control System of Lithium Battery Wrap Machine

Tension control system consists of tensioning mechanism, tensioning mechanism, tension testing mechanism and line speed testing mechanism. Lithium battery raw materials are drawn through the roll mechanism, and the roll mechanism collects lithium battery raw materials as batteries. However, during the roll process, the tension of lithium battery materials has changed due to inconsistent roll speed and roll speed. Therefore, it is necessary for the tension testing mechanism to detect the tension of the discharge belt, control the winding speed of the discharge mechanism, and form a closed-loop tension control system. The function of the wire speed detection mechanism is to detect the line speed of the conveyor belt. The system structure is shown in the figure below.

Lithium-ion battery material is drawn through the winding mechanism controlled by DC motor and the winding mechanism controlled by servo motor is rolled into a battery. When the winding speed and closing speed are inconsistent, the tension roll will deviate from the equilibrium position. When the winding speed is greater than the winding speed, the tension roll will be deflected to the right. When the winding speed is less than the winding speed, the tension roll will be deflected to the left.

The controller periodically detects the position of the tension roll, calculates the tension size, calculates the winding speed of the winding mechanism through a specific algorithm(such as the PID algorithm), and finally outputs to the DC motor. Therefore, the unwinding mechanism is a closed-loop control system, and the unwinding mechanism is an open-loop system, which is a system for unwinding and following the unwinding.

Principle of Tension Control System for Lithium Battery Wrap Machine

It can be seen from the above figure that the tension control system is essentially a linear speed servo tracking system. Simply speaking, it is to control the position of the tension roll by controlling the linear speed of the winding motor, so that it is in equilibrium and the system's constant tension control is achieved. Due to the synchronization between the speed of the winding line and the speed of the winding line, the change in the tension value is detected through the tension sensor, and this change is used as the feedforward control of the system. By adjusting the speed of the winding motor, the line speed is reached. The line speed of the actual winding is consistent. Keep the tension constant. However, the wire speed of the discharge motor can not follow the line speed of the roll pin, causing a loose movement of the material belt. The internal tension is large and small, and the performance is a relaxation of the material belt, which not only causes the deformation of the core of the lithium battery, but also greatly reduces the tidiness of the coiled core product, which is also the square lithium ion battery winding machine. The main reason for the low yield.

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