Comparison Between Open and Closed Loop Battery Charging Technique for Lithium-ion Battery

The present work focus on the comparison between open and closed loop battery charging techniques for lithium-ion (Li-ion) battery. Conventional types of open loop charging technologies like pulse charging, constant current-constant voltage (CC-CV) and multi stage charging etc. uses fixed battery parameters to decide the battery charging current. Effect of temperature variation during charging is generally not taken in to account in the case of open loop charging techniques. Temperature must be kept in certain range to enhance the effective battery life time. Charging current in closed loop technique depends on the temperature feedback. Present work compares between open loop CC-CV and close loop constant temperature-constant voltage (CT-CV) battery charging techniques in terms of charging voltage, charging current, battery state of charge (SOC) and battery temperature rise for different initial SOC level. Model is simulated in MATLAB/Simulink environment and study reveals that there is about 24% improvement in charging time as compared to the CC-CV charging technique.