基于动态可重构电池网络的大规模退役动力电池梯次利用储能系统运行性能评估

Operational Performance Evaluation of Large-scale Second-life Battery Cascade Utilization Energy Storage Systems Based on Dynamic Reconfigurable Battery Networks

退役动力电池因其一致性差、安全性薄弱等缺陷在梯次利用时面临巨大挑战。动态可重构电池网络(dynamic reconfigurable battery network,DRBN)能够有效提高退役动力电池梯次利用储能系统的一致性和安全性。目前DRBN储能系统已经进入工程应用阶段,然而现有的研究缺少对大规模DRBN储能系统的运行性能评估。为此,以实际运行的大规模退役动力电池梯次利用储能系统作为分析对象,选取储能系统中80个DRBN的1个月运行数据进行分析。从运行工况、均衡效果、薄弱辨识三个方面验证了DRBN储能系统对电池模组一致性的提升效果。数据分析表明,90%的DRBN一致性良好,且其他一致性较差的DRBN都能够被准确辨识。

Second-life batteries face huge challenges in cascade utilization due to poor consistency and weak safety.The dynamic reconfigurable battery network(DRBN)can effectively improve the consistency and safety of the second-life battery cascade utilization energy storage systems.Recently,DRBN energy storage systems have reached the stage of engineering applications.However,existing research lacks operational performance evaluation of large-scale DRBN energy storage systems.Therefore,we take a real-world large-scale second-life battery cascade utilization energy storage system as an example and choose the operation data of 80 DRBNs during one month for analysis.The effectiveness of the DRBN in improving the consistency of battery modules has been verified from three aspects:operating conditions,module balancing,and weak links.Data analysis shows that 90% of DRBNs have good consistency,and other DRBNs with poor consistency can be accurately evaluated.