基于改进型能量守恒SOC估算法的电动汽车三段式智能充电方式研究

为研究电动汽车安全、快速的智能充电方式,基于传统能量守恒法,考虑电池容量衰减和电池内阻损失对荷电状态(state of charge,SOC)估算的影响,提出改进型能量守恒SOC估算方法。对比分析几种传统充电方式,根据马斯定理确定最佳充电电流,提出以改进型能量守恒SOC估算法得到的SOC值作为判断依据的电动汽车三段式(小电流充电、脉冲充电、恒压充电)智能充电方式,并建立其仿真模型。结果表明:改进型能量守恒SOC估算法得到的SOC值要小于传统能量守恒法,其更加接近真实SOC值;三段式智能充电方式能根据电池组SOC值的变化智能地选择具体充电方式,实现了对电池的安全、快速充电。提出的基于改进型能量守恒SOC估算的三段式智能充电方式对当前电动汽车充电方式的研究提供了一定的参考价值,为智能充电方式研究效能的提升提供了一种可行方法,也为智能充电理论应用于工程实践打下基础。

Research on three-stage intelligent charging method based on improved energy conservation SOC estimation algorithm for electric vehicle

In order to study the safe and high-efficiency intelligent charging method for electric ve-hicle ,the improved energy conservation SOC estimation algorithm w hich considers the effects of the battery capacity attenuation and the internal resistance loss on the SOC estimation is pro-posed .The improved SOC estimation algorithm was based on the traditional energy conservation method .Then ,in order to verify the accuracy and feasibility of estimation algorithms ,the above proposed improved SOC estimation algorithm was analyzed and compared with the traditional charging methods .Furthermore ,according to the optimal charging current with Maas Theorem , the three-stage intelligent charging method (small current charging ,pulse charging and constant voltage charging) was proposed based on the improved energy conservation SOC estimation algo-rithm ,and the three-stage intelligent charging simulation model based on the improved energy conservation SOC estimation algorithm was established .The simulation results showed that the SOC value obtained by the improved energy conservation SOC estimation algorithm was smaller than the value obtained by the traditional energy conservation method .And the SOC value ob-tained by the improved energy conservation SOC estimation algorithm was more close to the real SOC value .Moreover ,the three-stage intelligent charging method based on the improved energy conservation SOC estimation algorithm can intelligently select the detailed charging method ac-cording to the SOC variation ,w hich could realize the fast and safe charging for electric vehicle . T he proposed three-stage intelligent charging method can provide reference for current charging method study for electric vehicle .And the improved SOC estimation algorithm can also provide one feasible method to enhance the effectiveness of the intelligent charging method for electric ve-hicle .In addition ,three-stage intelligent charging method can lay the foundation for application of the intelligent charging theory to engineering practice .