Title: Voltage-Based State of Charge Correction at Charge-End Show Chinese title

Title: 基于电压的充电结束时的荷电状态修正

Abstract: A voltage-based method is proposed to correct battery pack state of charge (SOC) estimation at the charge-end. Two main characteristics make the charge-end time span a good opportunity to correct SOC estimation: first, it is easy to detect when the battery is at the last stage of charging because the charging profile is known to the BMS designer and also during the charge-end time span the amount of current is low, and the terminal voltage of the battery cells are high; second, as the battery reaches the charge-end stage, we know that the true SOC is approaching to 100%. This paper presents a method to utilize these important features to correct the SOC estimation error. Using a voltage threshold method, the algorithm detects when the battery is close to the charge-end to activate the charge-end SOC correction strategy. Once activated, the strategy corrects the SOC using the maximum cell voltage to guarantee that SOC is 100% when charging is complete. The amount of correction is a function of maximum cell voltage and the charge current C-rate. Show Chinese abstract

Abstract: 基于电压的方法被提出用于在充电结束时校正电池组的荷电状态(SOC)估计。 两个主要特性使得充电结束时间段成为校正SOC估计的良好时机：首先，在电池处于充电最后阶段时容易检测到，因为充电轮廓对BMS设计者是已知的，并且在充电结束时间段内电流量较低，电池单元的端电压较高；其次，当电池达到充电结束阶段时，我们知道真实SOC接近100%。 本文提出一种方法，利用这些重要特性来校正SOC估计误差。 使用电压阈值方法，该算法检测电池何时接近充电结束以激活充电结束SOC校正策略。 一旦激活，该策略使用最大单元电压来确保充电完成时SOC为100%。 校正的量是最大单元电压和充电电流C率的函数。