Research On The Fast Charging Control System For Ntelligent Lithium-ion Batteries

With the growing of oil energy consumption and environmental pollution, theworld's governments and automotive industry generally aware of the importance ofenergy-efficient, low-emission or zero emission to the future development of theautomobile industry, one of the important is to develop new green energy. Lithium-ionbatteries as a new type of green energy, is considered to be the ideal choice forhigh-capacity and high-power.The advantages of lithium-ion battery in the large capacity (twice for the samenickel-cadmium batteries), high operating voltage (average voltage5is3.6V), highspecific energy (140Wh/Kg), low self-discharge rate (3%～5%) allowing a widetemperature range, long cycle life, small size, light weight, no memory effect,environmental pollution is small, compared to other batteries, it has outstandingadvantages, so lithium-ion battery market is not only huge and both long-term andstable, potential for development. Lot of car manufactures in the world are studying thepower lithium-ion battery charging method to shorten the charging time, and improvethe charging efficiency, The charge is a constant current-constant voltage method, thismethod needs longer time to charge, This paper is proposed based on a microcontrollerSTM32lithium-ion battery charging control circuit, and load the μC/OS-II real-timeoperating system, making the system intelligent operation, and enhance connectivitywith the host computer and user. Using current pulses-voltage pulse method to chargethe batteries, it can shorten the charging time and can extend the cycle life of the battery.The working principle of charging circuit, and introduces the devices and chipswhich used in the circuit are described in this paper, and the simulation of the circuit. isalso described One of the most important parts is the charging control circuit, the entirecircuit is controlled by the microcontroller, and complete the charge control to fourlithium-ion batteries.