The Research And Implementation Of Lithium Battery Winding Machine System Based On DSP

With the rapid growth in demand for lithium battery, as well as the continuous heightened requirements of its performance, the demand for Li-battery winding equipment is increasing steadily. It is not only for its quantity but also for its manufacture performance. Accordingly, the research for a set of high-performance, low-cost winding machine system design has great practical significance.This system design was mainly composed of three parts, including hardware design, software design and tension control algorithm. In hardware design, for the consideration of control performance, scalability, and cost, etc., the system used TI's 32-bit fixed-point high-speed digital signal processor (DSP)–TMS320F2812. Further more, Altera's CLPD chip in MAX II series–EPM1270 was chosen as the co-controller. In circuit design, taking the system's anti-interference performance and its stability fully into account, we employed the optocoupler isolation, isolation between the analog-ground and digital-ground, and circuit protection technology, which made a solid foundation for the long-term stability of the system.In software design, the system required accordance with the process to achieve control of the equipment. Therefore, a finite state machine based programming approach was adopted, which effectively improved the readability and portability. Meanwhile, CPLD was used as a co-controller of DSP to fulfill parts of the device driver. It helped to effectively share the operating load of DSP and reduce the difficulty of DSP program development. In human-computer interfacial design, Eview Company's industrial embedded touch screen with embedded CPU was used, which is simple, stable and reliable.Referring to tension control algorithm, the article focused on the principle analysis of the system, and resulted with a correlative mathematical model. Through MATLAB simulation, we had a clear understanding of the characteristics of the controlled object. And comparing the performance between the method of direct and indirect tension control, we achieved an improved controlling method eventually.In the end, we carried out a comprehensive performance test on the winding machine. The result showed that the system could run well. It can realize the automatic winding techniques of lithium battery with high efficiency and accuracy. Besides, when there is a failure during the winding process, it can provide accurate warning information timely. Then, such failure can be solved by the operator as he touches the manual button on the screen. As a result, it improves the efficiency of troubleshooting capability, which satisfies the demands of manufactory production.