摘要：【中文】本专利公开一种电池系统电芯容量分布区间的在线估算方法，通过监测所得电芯最高/最低单体电压、电流数据，利用辨识算法得到运行工况时间段内首尾开路电压（OCV），并根据SOC‑OCV关系将其转化为相应荷电量，根据压差变化趋势对荷电量做一定的修正，并通过一定条件限制使不同老化电芯采用不同迭代次数的计算公式，以解决电池老化不同带来的OCV变化不同导致的计算误差过大的问题，实现仅利用最高/最低单体电压即可达到在线准确估算电芯可用容量SOH值分布区间的目的；该发明可为电池系统修复价值、梯次利用价值提供参考，也可为电池系统健康状况做在线诊断，为高风险车辆发出预警，减少车辆事故的发生。 【EN】The patent discloses an online estimation method for a cell capacity distribution interval of a battery system, which comprises the steps of monitoring the highest/lowest cell voltage and current data of a cell, obtaining head-tail Open Circuit Voltage (OCV) in a running working condition time period by utilizing an identification algorithm, converting the OCV into corresponding charge according to an SOC-OCV relation, correcting the charge according to a certain pressure difference change trend, and limiting different aging cells by certain conditions to adopt calculation formulas with different iteration times so as to solve the problem of overlarge calculation errors caused by different OCV changes caused by different aging of the battery and achieve the purpose of accurately estimating the SOH value distribution interval of the available capacity of the cell on line by utilizing the highest/lowest cell voltage; the method can provide reference for the restoration value and the echelon utilization value of the battery system, can also perform online diagnosis on the health condition of the battery system, and can give out early warning for high-risk vehicles and reduce the occurrence of vehicle accidents.