Water loop heat pump type electric vehicle heat management system based on phase change heat storage

Abstract

The invention relates to a water loop heat pump type electric automobile heat management system based on phase change heat storage, which adopts a mode of coupling a phase change heat storage technology and a water loop heat pump technology. An output end of a power assembly heat dissipation subsystem is connected to an input end of a proportional three-way valve, a first output end of the proportional three-way valve is connected to an input end of a phase change heat storage device, a second output end is connected to an input end of a second electromagnetic valve, and an output end of the phase change heat storage device is connected to the input end of the second electromagnetic valve. Compared with the prior art, waste heat generated by the system can be efficiently recovered, the waste heat is released at a proper time, and the difference of quantity, form and time of energy in supply and demand is overcome. A phase change heat storage unit is additionally arranged, so that efficient heating at low temperature can be achieved, the problems of frosting, low heat efficiency, even running failure and the like caused by using an air source heat pump at low temperature are solved, efficient cooling at high temperature can be achieved, and therefore the area of a front-end radiator is reduced, wind resistance is reduced, and the endurance mileage is increased.

Description

technical field [0001] The invention relates to a thermal management system of an electric vehicle, in particular to a water ring heat pump type electric vehicle thermal management system based on phase change heat storage. Background technique [0002] 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 control system for the passenger compartment, battery and powertrain. It is mainly divided into three parts: passenger compartment thermal management subsystem (air conditioning cooling and heating), bat...

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

For battery heating, generally only water-heated PTC electric heaters are used, but consume a large amount of electric energy; in some related technologies, only the waste heat of the motor is used, but the waste heat of the motor cannot meet the needs of battery heating under all driving conditions

[0009] In the existing technology, the subsystems of the electric vehicle thermal management system technology are independent of each other and the integration level is low, resulting in low space utilization in the vehicle, and the heat generated by the motor, electronic control and battery waste heat cannot be 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: high-efficiency cooling at high temperature, high-efficiency heating at low temperature, waste heat storage under high-power driving conditions, and stored waste heat release under low-power driving conditions Wait

[0010] In addition, for the thermal management subsystem of the electric vehicle powertrain, first of all, under the high temperature in summer, most of the related technologies only use the front radiator for cooling. put forward higher requirements

Secondly, at low temperature in winter, the heat of the motor and electric control is generally directly lost to the air by low-temperature radiators and fans, and has not been fully utilized.

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