电动汽车蓄电池组管理系统及其状态检测

Study on battery management system for EV and its status detection

电动汽车蓄电池组的工作状态主要指各电池在工作时的端电压、工作电流和温度这3个参数的变化情况。对电池工作状态的检测通常有集中式检测法和分布式检测法。本文采用"部分"集中、"整体"分布的思路,将电池分成若干分组,每个分组集中检测,各分组分布检测,同时,采用"桥电容"技术解决了蓄电池组单体端电压检测中存在的参考点选择和被测电池与检测设备隔离的问题,形成了一种具有完全隔离功能的集中/分布式检测法。经过试验,该检测法对电压、电流和温度采集功能正常,数据准确、可靠。

The changes of voltage, current and temperature are the operating conditions of batteries in EVs. There are centralized and distributed measurements to detect the operating conditions of batteries. This paper puts forward a new way called centralized/distributed detection method with bridge-capacity technology, which can solve the problems including reference voltage selection and isolation of a cell from the testing device. The testing results indicate that this method has a good function for collecting the voltage, current and temperature data which are reliable.