Electric vehicle secondary loop heat pump air conditioning heat management system

Abstract

The invention relates to an electric vehicle secondary loop heat pump air conditioning heat management system. The electric vehicle secondary loop heat pump air conditioning heat management system comprises a refrigerant circuit and a cooling liquid circuit, the refrigerant circuit is composed of a compressor, an outdoor side heat exchanger, an indoor side heat exchanger, a passenger compartment PTC heater, a gas-liquid separator, a heating power expansion valve and the like; the cooling liquid circuit is composed of a chiller, a cooling liquid pump, a PTC for heating a battery, the battery, amotor liquid cooling plate and the like; according to the refrigerant circuit, different modes such as cooling, heating and dehumidification are achieved through switching of valves and pipelines, and according to the cooling liquid circuit, the functions of heat dissipation of the battery and electromotor electric control equipment, and battery pre-heating in winter under the low temperature work condition are achieved. In operation, a passenger compartment exchanges heat with indoor air through a refrigerant, it is guaranteed that the heat transfer efficiency is maximized, cooling liquid exchanges heat with the refrigerant in the chiller, and the number of the liquid cooling plate can be increased or decreased according to requirements. According to the electric vehicle secondary loop heat pump air conditioning heat management system, passenger compartment heat management and heat management of heating equipment such as the battery are combined, the structure is simple, and the highefficiency and energy-saving are achieved.

Description

technical field [0001] The invention relates to a secondary circuit heat pump air-conditioning system for an electric vehicle, in particular to a secondary circuit thermal management system for an electric vehicle that combines the thermal management of a passenger compartment with the thermal management of heating equipment such as batteries and motors. Background technique [0002] With the promotion of energy conservation and emission reduction policies, the market share of electric vehicles is getting higher and higher, but the short mileage of electric vehicles is still an urgent problem to be solved. Therefore, it is necessary to use electric PTC for heating in winter heating conditions. The use of PTC will reduce the cruising range by about 40%. The heat pump system with COP>1 can well solve the greatly reduced cruising range of electric vehicles in winter heating conditions. The problem. [0003] In addition, the power source of electric vehicles is the battery, ...

AI Technical Summary

Problems solved by technology

[0002] With the promotion of energy conservation and emission reduction policies, the market share of electric vehicles is getting higher and higher, but the short mileage of electric vehicles is still a problem that needs to be solved urgently. Therefore, it is necessary to use electric PTC heating in winter heating conditions. The use of PTC will reduce the cruising range by about 40%. A heat pump system with COP>1 can well solve the greatly reduced cruising range of electric vehicles in winter heating conditions. The problem

[0003] In addition, the power source of electric vehicles is the battery, and the working temperature of the battery pack has a certain limit. When the temperature is too low in winter, its discharge rate will be greatly reduced, which will affect the operation of the system; the battery will generate heat during operation, and the temperature of the battery pack will When it is too high, it will also reduce its efficiency, and there is even a danger of explosion

Images