Abstract: Zinc-bromine flow batteries have become a key storage device for solving grid peaking due to their characteristics such as deep charging and discharging capability and long cycle life. In this paper, a zinc-bromine flow battery control system composed of three key components: Power calculation module, power control module and temperature control module is designed. The power calculation module quickly calculates the operation mode of the battery system based on the source-network-load configuration signal from the power grid and switches the charging, discharging, standby and shutdown modes under different conditions. The power control module realizes power control by adjusting the circulating flow of electrolyte to ensure the optimal power of the system. The temperature control module operates the system at the optimal ambient temperature through heating and cooling. As an example, a zinc-bromine liquid current battery with a capacity of 20 kWh is shown to demonstrate the configuration parameters and operation modes of the battery control system and battery modules, and the control of different operation modes of the system is realized through the operation of the human-machine interface.