The present invention relates to the technical field of electronics and particularly relates to a storage battery system. A storage battery system of a distribution automatic terminal is applied to the distribution automatic terminal. The storage battery system comprises a first energy storage device which is connected to the power supply port of the distribution automatic terminal and is used for supplying a power supply, a second energy storage device which is in parallel connection with the first energy storage device and is used for ensuring that the end voltage of the first energy storage device is in a first voltage level, a monitoring device which is used for monitoring the operation of the first energy storage device and/or the second energy storage device and obtaining monitoring information, and a control device which manages the first energy storage device and the second energy storage device according to the monitoring information. According to the system and the method, the first energy storage device and the second energy storage device are connected in parallel to form a composite storage battery, the power density of the storage battery can be significantly improved, and the application effect of a low-temperature environment is improved. When the storage battery is used to carry out large current discharge, a storage battery end voltage drop level can be reduced for about 2V to 3V by a super capacitor.