Redundant Configuration and Fault Tolerance Control Method for Enhanced Reliability of Energy Storage System

The use of energy storage systems (ESSs) is increasing in the industry as part of global efforts to reduce carbon emissions. In particular, large-capacity ESSs that adopt lithium-ion batteries, which have high energy density characteristics, are being used not only in stationary applications but also in mobility industry fields such as vehicles and ships. However, ESSs with lithium-ion batteries have a high risk of fire and failure, which reduces the reliability of the system. This paper studies the redundant type ESS configuration and its fault tolerance control method for enhanced reliability of ESSs to which lithium-ion batteries are applied. Hence, we present a new control method for improving the cycle life of ESSs. The effectiveness of the proposed control method is validated using a 10S-1P configuration lithium-ion battery module, with reference to the operating profile of railway vehicles.