电动汽车用锂离子电池荷电状态定义和估算方法  

SOC definition and estimation for EV Li-ion batteries

作　　者：文锋[1] 林程[1] 姜久春[2] 张维戈[2] 王占国[2] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京交通大学电气工程学院,北京100044

出　　处：《高技术通讯》2012年第9期975-979,共5页Chinese High Technology Letters

基　　金：863计划（2011AA11A223）资助项目.

摘　　要：分析了现有电池荷电状态（SOC）定义方法的主要问题，基于电池的开路电压提出最大可用容量的概念，并对电池的SOC重新进行定义，从而实现了充放电容量与电池工况之间的解耦；通过更新电池的最大可用容量，避免了老化对SOC估算精度的影响；通过将电池的欧姆压降和极化电压折合到放电容量的损失上，得到电池和电池组实际可用容量的计算方法，并验证了其有效性和可行性。The main problems of existing SOC （ state of charge） definition methods were analyzed, the concept of maxi- mum available capacity was proposed based on the open circuit voltage （OCV） of a battery, and the battery SOC was redefined, thus the decoupling of a battery＇ s charge/discharge capacity and work condition was realized. Through updating the maximum available capacity of a battery, the effect of aging on the SOC estimation accuracy was avoided. By converting the internal resistance voltage drop and the polarization voltage into the loss of discharge capacity, a method for calculating the actual available capacity of a battery or a battery pack was achieved, and its validity and feasibility were verified.

关 键 词：电动汽车 荷电状态(SOC) 最大可用容量 实际可用容量 

分 类 号：U463.633[机械工程—车辆工程]