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As the world’s worsening environmental pollution, shortage of oil resources, global warming, countries are actively introduced incentive policies to intensify the development of new energy vehicles, pure electric vehicles and hybrid vehicles, the world set off a new energy automobile craze. Long-term view, hybrid vehicles, improvements to the existing automotive technology can not completely zero-emission, pure electric cars can achieve zero emissions, get rid of dependence on oil resources. The electric car is the ultimate development goals.The key technologies of electric vehicles, battery technology is the core technology, the industry recognized the lithium iron phosphate is most suitable for the development of battery power, with the domestic and foreign manufacturers of iron phosphate lithium battery constant technological improvements, to meet the basic power battery requirements, but its industrial chain is still not perfect, especially charging facilities, hinder the development of electric vehicles.Firstly, starting from the lithium iron phosphate battery principle to study the current charging method, more convenient and feasible charging method, and to improve the design-based STM32series of12,8AH lithium iron phosphate battery pack charging power. The main design ideas, the use of The STM32PID control, by sampling the battery of the parameters, adjust the duty cycle, the output PWM waveform control tube up and down the half-bridge conduction cut-off time to simulate the charging curve and real-time battery for the protection the charging power for fast, efficient charging of the lithium iron phosphate battery to provide a reference for electric vehicle charging facilities.
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