Study on the Charging and Discharging Characteristics of the Lithium-ion Battery Pack

As the charging and discharging current ratio has an important influence on the charging and discharging characteristics of the lithium-ion battery pack, the research on it can provide the basis for the calculation of SOC and the safe use of the lithium battery. In this paper, the change rule of charging and discharging voltage is studied by means of experimental study. The results showed that the higher the charging current ratio is, the more the voltage drop after the voltage reached the stable state, and the maximum decrease of 0.95V.The higher the discharging current ratio is, the greater the battery discharge to the cut-off voltage after reaching steady state voltage, highest in 1.21 V. Namely, the battery pack is stable after the open circuit voltage and closed circuit voltage difference between charging and discharging current into positive correlation.