基于电池输出特性的电动汽车动力性能评价方法研究

Research on evaluation method of electric vehicle's dynamic performance based on battery output characteristics

对电动汽车不同工况负载进行受力分析的基础上,以直流伺服电机作为电池驱动的主动牵引电机,以交流伺服电机作为提供不同工况负载阻力电机,构建基于控制核心可编程逻辑控制器(PLC)的模拟双电池混合动力牵引的电动汽车电池性能测试平台。通过模拟负载阻力和行驶工况,对匀速行驶状态下的电池动力输出性能进行实验研究,同时采用车辆仿真软件ADVISOR对相同行驶工况进行模拟分析。结果表明:锂电池在放电过程中存在最大有效输出的工作区,单位时间内的电压变化率可以作为预测和判断对应工况下电池持续有效输出和续航时间的依据。软件模拟分析结果和实验测试结果一致,证明了测试平台的可靠性。

Based on the load analysis of electric vehicles under different working conditions,this work employs a DC servo motor as the battery-driven active traction motor and an AC servo motor as the load resistance motor under different working conditions in order to build an analog dual battery based on the PLC control core. The hybrid traction electric vehicle battery performance test platform simulates the load resistance and driving conditions allowing experimental research on the battery power output performance of the battery-powered electric vehicle under constant driving conditions to be carried out. The vehicle simulation software ADVISOR was used to simulate and analyze data obtained under the same working conditions. The results show that there is a working area with the maximum effective output during the discharge process of the lithium battery. The voltage change rate per unit time can be used as a basis for predicting and judging the continuous effective output and battery life of the battery under the corresponding operating conditions. The software simulation analysis and experimental test results are consistent,indicating the reliability of the test platform.