Thermal management system of electric vehicle

Abstract

The invention provides a heat management system of an electric vehicle. The heat management system comprises a first compressor, a second compressor, a first heat exchanger, a heat regenerator, a first electronic expansion valve, a gas-liquid separator, a second electronic expansion valve, an in-vehicle evaporator, a battery cooler, a first water pump, a battery pack water cooling plate, a second water pump and a first radiator. According to the heat management system, the refrigerating loop of the passenger compartment and the cooling loop of the battery can be connected in series to achieve secondary cooling, the connection relation of the heat management system in the refrigerating mode is simplified, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of vehicle thermal management, in particular to a thermal management system for electric vehicles. Background technique [0002] With the rapid development of electric vehicle technology, heat pump technology is becoming more and more popular in electric vehicles. At present, the traditional heat pump air conditioner mainly has the following disadvantages: [0003] 1. Traditional heat pump automotive air conditioners use R134a as a refrigerant, but R134a has a very high GWP (Global Warming Potential). Moreover, the R134a refrigerant will pollute the environment during use and production. [0004] 2. R134a has low heating capacity at low temperature. This low heating capacity at low temperatures is ultimately determined by the physical properties of the R134a refrigerant. At low ambient temperature, the suction pressure of the R134a system is too low. In order to avoid system vacuum, the suction pressure of the com...

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Problems solved by technology

And R134a refrigerant will pollute the environment during use and production

[0004] 2. R134a has low heating capacity at low temperature

[0006] 1. The pressure of the carbon dioxide heat pump system is high during operation (above 110bar), which leads to the need to switch between different working modes for the carbon dioxide refrigeration system when realizing the heating, cooling, dehumidification or defogging functions required by the passenger compartment, resulting in the complexity of the carbon dioxide heat pump system and Unstable, potential safety hazard

[0007] 2. Due to CO 2 The operating pressure of the transcritical heat pump system is much higher than that of conventional refrigerants, the heat release temperature is higher, and the pressure difference between high pressure and low pressure is large, the throttling loss is serious, the cycle efficiency is relatively low, and the refrigeration energy efficiency is relatively low

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