Fault tolerance and reliability evaluation method and system for battery system

The invention discloses a fault tolerance and reliability evaluation method for a battery system, and relates to the technical field of battery energy storage system optimization design, and the method comprises the steps: analyzing the parallel serial configuration on a battery module structure, and calculating the minimum number of BPMs; determining the real redundancy limit of the BESS, and calculating the reliability of a single BPM; and determining the reliability of a fault-tolerant system composed of independent identically distributed components, calculating the reliability of parallel serial configuration, and comprehensively obtaining the reliability and fault tolerance of the battery energy storage system. According to the invention, the battery energy storage system is allowed to continue to work under the fault condition through parallel and serial modularization, and the fault is compensated. For a parallel-series architecture, the greater the number of modules connected in parallel is, the grea