Energy storage device and circuit breaking control method thereof

An energy storage device, characterized by comprising a main circuit formed by multiple battery modules connected in series, wherein the energy storage device is configured to be connected with an external device to form a circuit, each of the battery modules respectively comprises a battery unit, a control unit and a switch assembly, the control unit is configured to control the switch assembly to connect a single battery module of the multiple battery modules in series into or bypass out of the main circuit of the energy storage device, and when a battery module of the multiple battery modules is bypassed, a circuit path connecting a battery module before the present battery module and a battery module after the present battery module is formed in the present battery module;

• the energy storage device further comprises a detection module and a circuit breaking protection module connected in series with the main circuit of the energy storage device;
• the detection module is configured to detect working status of the energy storage device, and turn on the circuit breaking protection module when detecting failure of the energy storage device;
• the circuit breaking protection module is configured to output a circuit breaking drive power after being turned on, and drive a circuit breaker in the main circuit of the energy storage device to break based on the circuit breaking drive power, to disconnect the connection circuit between the energy storage device and the external device.