Heat dissipation system, electric vehicle and heat dissipation method

The invention provides a heat dissipation system, an electric vehicle and a heat dissipation method.The heat dissipation system comprises a transmission motor, a hydraulic motor and a hydraulic water pump, a motor shaft of the hydraulic motor is connected with fan blades, and the hydraulic water pump is used for driving cooling water to circulate; a first high-pressure oil channel used for oil circulation is arranged between the hydraulic pump and the hydraulic motor, and a second high-pressure oil channel used for oil communication is arranged between the hydraulic pump and the hydraulic water pump. The heat dissipation system has the beneficial effects that the hydraulic motor and the hydraulic water pump are made to conduct heat dissipation work through the hydraulic pump, an adopted power source is the transmission motor instead of a battery of the whole vehicle, the hydraulic pump can work as long as the vehicle runs, the heat dissipation system is low in energy consumption, and the service life of the b