Thermal management system and electric vehicle

Abstract

The application provides a thermal management system and an electric vehicle. The thermal management system comprises a refrigerant loop and a water loop. In the refrigerant loop, an outlet of a compressor is connected with a first flow channel; a first flow channel is connected with an external condenser through a first valve set, the external condenser is connected with a second throttle valve and a third throttle valve, the second throttle valve is connected with a third flow channel, the third flow channel is connected with a compressor inlet through a gas-liquid separator, the third throttle valve is connected with an evaporator, and the evaporator is connected with the compressor inlet through the gas-liquid separator. In the water loop, an outlet of a first circulating pump is connected with an inlet of a first heat dissipation channel, an outlet of the first heat dissipation channel is connected with an inlet of a positive temperature coefficient heater, an outlet of the positive temperature coefficient heater can be connected with an inlet of a fourth flow channel, and an outlet of the fourth flow channel can be connected with an inlet of the first circulating pump. By theadoption of the thermal management system, the maximum refrigerating capacity can be increased, and low-pressure and high-pressure alarm shutdown of the compressor is avoided during refrigerating andheating light loads.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to a heat management system and electric vehicles. Background technique [0002] Electric vehicles use batteries as power sources, which are more energy-efficient and environmentally friendly than traditional fuel vehicles. The thermal management system of electric vehicles is different from traditional fuel vehicles. In addition to meeting the heating requirements of the air-conditioning system in the passenger compartment, it must also enable the battery and motor to work within a reasonable temperature range. The thermal management system of electric vehicles accounts for 25% of the energy consumption of the whole vehicle. Especially in winter heating conditions, when the air conditioner and the battery have heating needs at the same time, the proportion of consumption will further increase, and the cruising range of electric vehicles also decreased according...

AI Technical Summary

Problems solved by technology

[0003] Although many electric vehicles have adopted thermal management systems with heat pumps, the evaporator is prone to frosting in the light-load cooling mode, and the compressor will start and stop frequently due to the evaporator anti-freezing protection alarm, resulting in poor user experience. Poor; in the heating and light load mode, the demand on the high-pressure side is small, which may easily lead to high-voltage alarm shutdown on this side, so that only PTC heating can be turned on, which reduces the system efficiency; in addition, due to the huge demand for cooling capacity during fast charging, if Failure to dissipate heat from the high-pressure side will result in the cooling capacity of the system failing to meet the requirements

Images