Abstract: 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.