Low-power-consumption heat management system of electric car

Abstract

The invention relates to an electric car heat management system, in particular to a low-power-consumption heat management system of an electric car. The low-power-consumption heat management system comprises an electric compressor, a condenser, a refrigerant solenoid valve, a thermostatic expansion valve, an HVAC assembly, an electronic expansion valve, a cooler, a first expansion kettle, a thirdelectronic water pump, a fourth three-way valve and a third three-way valve. After the components are combined, a passenger compartment refrigerating cycle loop, a battery forced cooling cycle loop, abattery low-temperature heat radiation cycle loop, a passenger compartment heating cycle loop, a battery forced heating cycle loop, a battery waste heat utilization cycle loop, a battery temperatureequalization cycle loop and a motor cooling cycle loop are formed. According to the low-power-consumption heat management system, the situation that a PTC and the electric compressor are utilized forheating and cooling a battery can be effectively reduced, and therefore the whole car power consumption is reduced, and the driving mileage is increased.

Description

Technical field [0001] This application relates to an electric vehicle thermal management system, specifically a low-power thermal management system for electric vehicles. The system includes motor cooling, charger and DCDC cooling, battery heating and cooling, and passenger cabin refrigeration and heating systems. It can also utilize the motor Waste heat is used to heat the battery and provide a low-power battery cooling system. Background technique [0002] With the popularization and application of green energy in the country, electric vehicles have been widely accepted. However, based on the current development of battery technology, the cruising range of new energy vehicles has been widely concerned, and cruising range is the main factor to measure a new energy vehicle. However, the current thermal management system of new energy vehicles uses electric compressors to cool the battery and the passenger compartment. When the air conditioner is turned on in the passenger c...

AI Technical Summary

Problems solved by technology

However, at present, the thermal management system of new energy vehicles uses electric compressors to cool the battery and cool down the passenger compartment. When the air conditioner is turned on in the passenger compartment, the power consumption of the electric compressor is too large, which has a relatively large impact on the cruising range of the vehicle. Large, resulting in poor driving experience for customers

Especially in winter when the passenger compartment needs to be heated or the battery needs to be heated by PTC, the cruising range plummets due to the large power consumption of the PTC

[0003] At present, the thermal management scheme of new energy vehicles mainly focuses on using electric compressors, plate heat exchangers, water pumps, etc. to form a refrigeration circuit to cool down the battery; using water heating PTC, plate heat exchangers, water pumps, etc. to form a heating circuit to heat the battery ; Since electric compressors and plumbing PTCs usually use high power consumption, the power is as high as several kilowatts, which will inevitably affect the cruising range of the vehicle

[0004] Some of the inventions use four-way water valves to switch circuits. Due to the immature technology of four-way water valves, less market applications, and high costs, the four-way water valves that are also hindered cannot be promoted as a switching solution.

[0005] Patent No. CN201710911875 "Automotive Thermal Management System and Vehicles Equipped with the System" effectively improves the above-mentioned technical solution, but the patent has difficulty in exhausting air, and when the battery needs compressor cooling, the passenger compartment cannot be closed

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