The energy storage device adopts lithium titanate battery, which has good safety, high and low temperature performance, long cycle life and wide working environment temperature range (-20℃~45℃). The battery is cooled by liquid, and the weight of the whole machine is less than 1500kG；. Each internal unit adopts modular design, which is easy to maintain; Communicate with the MVB network of the whole train. At the same time, the control unit of the whole train is provided with the maintenance Ethernet, and the BMS unit is provided with the maintenance CAN network to support the download and maintenance of fault information.