Multi-heat-source heat pump type electric vehicle heat management system

Abstract

The invention provides a multi-heat-source heat pump type electric vehicle heat management system. The requirements of six temperature working conditions and three driving working conditions under all working conditions can be met only by controlling five simple valves. The mode that an air source heat pump is combined with a water loop heat pump is adopted, a low-temperature heat source is provided through an air source, system waste heat and a small amount of electric energy, a multi-heat-source heat pump is formed, the requirements of different low-temperature working conditions can be met, and the energy utilization efficiency is effectively improved; and under the extremely low-temperature working condition, the water loop heat pump mode is switched to operate, so that a series of problems such as incapability of operating the heat pump and frosting caused by the air source heat pump can be avoided. According to the system, a passenger compartment heat management subsystem, a battery heat management subsystem and a power assembly heat management subsystem are organically integrated, the valve control operability is high, the component structures are compact, and the integration degree is high; and the passenger compartment heat management system adopts a water-cooled condenser as a heat release device of a refrigerating circuit, and the common problems existing when a condenser is used at present can be solved.

Description

technical field [0001] The invention relates to a thermal management system of an electric vehicle, in particular to a multi-heat source heat pump type electric vehicle thermal management system. Background technique [0002] The development of electric vehicles plays an important role in combating global warming and reducing global vehicle pollution. Therefore, electric vehicles are the main trend of the future development of the automobile industry. With the rapid development of electric vehicles, issues such as endurance, battery life, safety, comfort, and efficiency have become prominent and have become important factors that hinder the development of electric vehicles. As the core components of electric vehicles, batteries, motors, electronic control units, and air-conditioning systems are closely related to the above problems, and the factor that most affects their performance is temperature. The electric vehicle thermal management system is an integrated temperature...

AI Technical Summary

Problems solved by technology

[0004] (1) The suction temperature of the compressor is low at low temperature, resulting in low system efficiency, high power consumption, poor heating performance, and even inoperability at extremely low temperature;

[0005] (2) The evaporator outside the car is easy to frost or even freeze, but it is difficult to defrost, which seriously affects the heat exchange efficiency;

[0006] (3) The effective utilization rate of energy is low, and the waste heat generated by the motor, electric control and battery cannot be effectively used;

[0007] (4) The comfort is poor, and it needs to switch to the cooling mode in the defrosting mode, but the defrosting time is long, which seriously affects the thermal comfort

However, the use of water ring heat pumps in the prior art will increase the heat transfer resistance on the high pressure side, resulting in an increase in condensation temperature and a decrease in thermal efficiency

[0009] At present, the subsystems of most electric vehicle thermal management system technologies are independent of each other and have low integration, resulting in low space utilization in the vehicle, and the heat generated by the motor, electronic control and battery waste heat has not been effectively utilized.

Even if the above problems are taken into account in a small number of systems, the piping connections of the system are complex, prone to failure, and the working conditions are limited, and the energy utilization method is relatively simple.

In addition, most electric vehicle thermal management system technologies lack the consideration of some necessary scenarios, such as efficient cooling at high temperature, efficient heating at low temperature, etc.

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