锂电池极片超声波金属焊接机的设计

摘要

According to the welding process of lithium battery electrode, a mechanical structure was proposed based on piezoelectric ceramic longitudinal vibration. A full digital control of ultrasonic metal welding power system was designed. In this welding power system, phase-shifted PWM digital amplitude controlling, amplitude stepping, programmable starting rate, stack frequency auto seeking and frequency auto tuning technologies were applied. It was proved that the machine could track frequency quickly, precisely control amplitude and protect from all kinds of fault in practical application.%根据锂电池电极焊接工艺要求,提出了一种基于压电陶瓷纵向振动的机械结构形式,设计了一种全数字化控制的超声波金属焊接机电源系统.该电源系统采用移相PWM数字振幅控制、振幅阶梯输出、可编程的缓启动,自动焊头频率搜索及自动频率跟踪等技术.实际使用证明,该机能快速实现自动频率跟踪、精确振幅控制、完善故障保护.