基于欧姆内阻压降的电池簇不一致性在线监测方法研究

由于电池pack箱初始性能参数及外部工作环境存在一定差异，针对其工作过程中不一致性问题的安全监测极为重要。若对箱体中每个单体电池各项进行实时监测与处理，数据采集量过大，易产生不良数据。因此在实现保障储能电站电池簇安全运行状态的条件下，通过探究在恒流放电过程中因不一致性而引发的电池簇与电池pack箱欧姆内阻压降浮动规律，提出一种基于欧姆内阻压降的电池簇不一致性在线评估方法。通过获取电池簇与表征单体因欧姆内阻造成的压降幅值，进行实时拟合得到线性关系，并求导得到变化速率，对变化速率进行在线记录，若电池簇因电池pack箱老化而存在不一致问题，则变化速率呈现增大趋势，利用此特征进行在线评估。最后，通过实验对所提方法的可行性进行验证。

Research on Online Monitoring Method of Battery Cluster Inconsistency Based on Ohmic Internal Resistance Voltage Drop

Due to the difference between the initial performance parameters and the external working environment of battery packs, safety monitoring for the inconsistency in the working process is important. If each single cell in the pack is detected and processed in real time, excessive data will be collected, which makes bad data easily appear. Therefore, under the condition of ensuring the safe operation of battery clusters in energy storage power stations, this paper explores the floating law of voltage drop caused by the ohmic internal resistance of battery clusters and battery packs during the constant current discharge and proposes an online evaluation method of battery cluster inconsistency based on ohmic internal resistance voltage drop. By this method, the voltage drop caused by the ohmic internal resistance of battery clusters and characterization pack is obtained, and the linear relationship is established by real-time fitting. The change rate is calculated by derivation and recorded online. If battery clusters are inconsistent due to the aging of battery packs, the change rate will increase, and the online evaluation will be carried out accordingly. The feasibility of the proposed method is verified by experiments.