Structurally, a refrigerated truck unit in Chongqing is basically composed of a frame, electric motor, controller, battery, body, handlebar controls, ignition, braking system, and instruments. The battery serves as the power reserve for the unit, driving the motor and providing power. Battery capacity directly affects the unit's range. Therefore, daily battery maintenance is crucial; excessively high or low temperatures affect battery capacity, ensuring sufficient charge for daily travel needs. The motor, the "heart" of the unit, primarily converts the electrical energy stored in the battery into kinetic energy. The unit controller, the "brain," controls the motor's start, operation, forward and reverse movement, speed, and stop, as well as other electronic components, making it the core component of the vehicle's drive system. Typically, the controller is installed below the seat, in a relatively enclosed environment.