Method and device for prolonging service life and improving performance of large-scale liquid flow energy storage system

The invention discloses a method and device for prolonging the service life of a large-scale liquid flow energy storage system and improving the performance of the large-scale liquid flow energy storage system. The method comprises the steps that the electrolyte temperature of the system is determined; wherein a first temperature range, a second temperature range and a third temperature range with sequentially increased temperatures are preset in the system; if the temperature of the electrolyte is within a second temperature range, controlling the main circulating pump to work, and judging whether to control the auxiliary circulating pump to work by using the charging/discharging current of the system or judging whether to control the auxiliary circulating pump to work by using the pressure borne by a galvanic pile in the system according to the comparison condition of the SOC of the system and a preset SOC1 while controlling the main circulating pump to work; and if the temperature of the electrolyte is wit