BMU & CMU manage the battery pack and battery string respectively, conduct comprehensive and real-time measurement and protection for the lithium battery in the energy storage system, and provide measurement data such as single battery voltage, single battery temperature, battery pack connecting cable pole temperature, battery string voltage battery string current, battery residual capacity (SOC), insulation monitoring, as well as fan, contactor and circuit breaker control functions, Support the fixed value overrun logic interlocked with the process of BESS & microgrid dispatching control terminal to achieve the protection of battery.