Title :
Study of high-capacity single-body Li-ion battery charging and discharging system
Author :
Wang, Jianqiang ; Li, Jingxin ; Zhang, Weige
Author_Institution :
Dept. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China
Abstract :
This paper proposed a high-efficiency battery charging and discharging system for high-capacity single-body Li-ion battery. This system can work as battery formation system or battery test system. The main system structure includes a single-phase bi-directional PWM rectifier, dc-link, half-bridge converter with current-doubler synchronous rectifier as charging unit and interleaved pull-push converter as discharging unit, and control unit and communication port. The charging and discharging units were designed separately for more feasible control strategy, because several such units can be paralleled to be a bigger system through dc-link. The energy balance among batteries and the grid is controlled automatically. There are three system operation modes: all batteries charging from the grid or discharging to the grid, energy transfer among charging batteries, discharging batteries and the grid. Besides of basic functions, battery energy records were accomplished by communication with the host computer. Such records will beneficial to the battery lifetime evaluation.
Keywords :
PWM rectifiers; lithium; power convertors; secondary cells; Li; battery formation system; battery lifetime evaluation; battery test system; current-doubler synchronous rectifier; half bridge converter; high-capacity single-body Li-ion battery discharging system; pull-push converter; single-phase bidirectional PWM rectifier; Automatic control; Batteries; Bidirectional control; Communication system control; Control systems; Energy exchange; Pulse width modulation; Pulse width modulation converters; Rectifiers; System testing; PWM rectifier; charge; current-doubler synchronous converter; discharge; half-bridge converter; push-pull converter;
Conference_Titel :
Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4166-2
Electronic_ISBN :
978-1-4244-4167-9
DOI :
10.1109/PEDS.2009.5385911