Research On Monitoring System Of High-Capacity Li-ion Battery Formation Equipment

It is one necessary procedure to format high-capacity power battery in production process. To complete the entire battery production, every battery should be charged and discharged several times. They call this whole process, Battery Formation. Due to technical and cost factors, most of domestic battery formation equipments consume energy through the resistance when they are discharging, it causes a great of waste. To this end, my laboratory made a high-efficiency battery formation equipment development issue and the corresponding subject programs to deal with it. In this paper, for the technical difficulties such as high-precision measurement of charging and discharging power, effective control operation and data record, power flow control of charging and discharging, it analyzes the circuit topologies and principles of charging module, discharging module and the single-phase PWM rectifier. On this basis, it applies Freescale's MCU--MC9S12D64 as core control chip and develops a brand new Control Module for high-capacity power battery formation equipments, in line with accepted features of Li-ion battery and its characteristics of charging and discharging. Moreover, in order to control system operation and monitor real-time battery status effectively, it also develops a centralized computer control system interface based on CAN communication network. Finally, experimental results show the feasibility of battery charging and discharging control tactics and the reliability of centralized computer control system interface. Other than the existing equipments now, this newly-developed equipment actually can save energy more than 20%, and its power measurement accuracy can reach to within 1%.