The power change mode is to directly replace the battery pack for new energy vehicles to make up the power supply. Generally, the battery pack can be replaced with full power within one minute at a time. The battery pack for early power station change is usually charged outside the station and transported to the power station through centralized charging and unified distribution. At present, the mainstream power station has a station loading charging system, which can be completed in the station. At the same time, the station is equipped with a constant temperature system to ensure charging safety, And 24 * 7 unattended operation has been realized.