Control method for improving battery protection of energy storage system

The invention discloses a control method for improving battery protection of an energy storage system, relates to the technical field of energy storage, is applied to the conditions that a battery is just emptied and a power grid is powered off when the energy storage system is in normal charge-discharge circulation, and is also applied to the conditions that the energy storage system is in a standby state for a long time and no alternating current power supply supplies power to a UPS (Uninterrupted Power Supply). And when the UPS is used up, the UPS cannot supply power to the EMS and the BMS normally, so that the energy storage system fails and is shut down. According to the invention, the battery system can be effectively protected, the service life of the battery can be prolonged, system faults can be reduced, the maintenance cost of after-sales service can be reduced, the auxiliary power supply UPS can be protected, the standby time of the auxiliary power supply UPS can be prolonged, and the service life