Multi-connected multi-functional heat pump type electric air-conditioning system and working method thereof

Abstract

The invention discloses a multi-connected multi-functional heat pump type electric air-conditioning system and a working method thereof. The air-conditioning system comprises an electric compressor, an out-of-vehicle heat exchanger, a vapor-liquid separator, an in-vehicle heat exchanger, a battery cooler, a vehicle-mounted storage battery, a battery cooler water pump, an electronic expansion valve, an electromagnetic valve, a water tank, a low-temperature cooler water pump, two-position three-way valves, a low-temperature cooler, an out-of-vehicle heat exchanger fan and an in-vehicle heat exchanger fan. According to the air-conditioning system, the year-round operating work condition of an electric vehicle can be well dealt, the in-vehicle heat exchanger and the battery cooler can serve as an evaporator and a condenser according to the needs of the operating work condition, the out-of-vehicle heat exchanger can decide to serve as the evaporator or the condenser in an automatically-matched mode according to the heat load, and heating or cooling of a battery can also be met while the in-vehicle refrigerating or heating requirements are met.

Description

technical field [0001] The invention relates to a heat pump type electric vehicle air conditioning system, in particular to a multi-connected multifunctional heat pump type electric vehicle air conditioning system and its working method. Background technique [0002] Electric vehicles overcome the fossil fuel dependence and environmental protection problems of fuel vehicles. They have diversified energy utilization, are quiet and pollution-free, and represent the development trend of future automobiles. Electric vehicles do not use engine waste heat, so heat pump air conditioning systems are required. [0003] Traditional heat pumps have the following problems: [0004] 1. The year-round operating conditions of electric vehicles are complex, and traditional heat pumps cannot cope well with such complex conditions of year-round operation. As the air-conditioning system of the electric vehicle air conditioner, the heat pump is responsible for not only the air conditioning in...

AI Technical Summary

Problems solved by technology

[0005] 2. Traditional heat pumps have low energy efficiency

The main reasons for the low energy efficiency are as follows: 1) Some traditional electric vehicle air conditioners use PTC electric heating, or use the combined operation of heat pump and PTC when heating in winter, and the efficiency of PTC heating is lower than that of heat pumps, and the efficiency is low. No energy saving; 2) The heating of the battery is not fully utilized. Most traditional electric vehicle air conditioners often only consider the cooling of the battery at high temperatures in summer in terms of battery thermal management, but the heating of the battery in winter is not fully utilized. In fact, During winter heating, battery heating can be used to improve heat exchange on the evaporation side and improve energy efficiency; 3) The impact of defrosting on heating capacity, the evaporator using air as the heat source will inevitably frost during winter heating

For heat pumps that change the refrigerant flow direction for defrosting, switch to cooling operation during defrosting. At this time, in order to avoid blowing cold air inside the car, the fan of the heat exchanger inside the car is turned off. This is because the heat transfer of the evaporator is poor. The defrosting energy of the heater is almost equal to the power consumption of the compressor, the defrosting effect is poor and the time is long, which has a negative impact on the heating capacity of the heat pump and the comfort of the car

Images