Electric vehicle thermal management system, method and device

Abstract

The application discloses a thermal management system, method and device for an electric vehicle, which belongs to the technical field of electric vehicles and can be applied to smart vehicles in the field of automatic driving. The first end of the compressor in this system is connected to the external heat exchanger through a reversing valve, and a cut-off valve is provided on the connection path with the external heat exchanger; the second end is connected to the battery heat exchanger through a reversing valve. connected, and there is a cut-off valve on the connecting path; the external heat exchanger is connected with the electric heater and the heat exchanger in turn; the heat exchanger is connected with the battery heat exchanger through the expansion valve, and the heat exchanger is connected with the power supply through the three-way valve The liquid cooling loop of the system is connected in parallel; the system realizes the thermal management of the battery by controlling the reversing valve, each shut-off valve and each expansion valve. And in the thermal management process, when the heat exchanger outside the vehicle needs to be heated, the three-way valve and / or the electric heater are controlled to heat the heat exchanger outside the vehicle. The application can achieve the defrosting effect, so that the heat exchanger outside the vehicle can work stably, so as to ensure stable system performance and improve thermal management efficiency.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to a thermal management system, method and device for electric vehicles. Background technique [0002] Compared with traditional fuel vehicles, because electric vehicles use batteries as power sources, they have the characteristics of energy saving and environmental protection, which has become a trend in the development of automobiles. In practical application scenarios, it is usually necessary to perform thermal management on management objects such as the cabin, battery and power system, so that the temperature of these objects can be maintained within the operating temperature range. For example, this thermal management includes cooling and heating management, Wherein, the power system includes but not limited to a motor, a motor controller, and a power device. [0003] In related technologies, in order to realize the thermal management of electric vehicles,...

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Problems solved by technology

[0006] This application provides a thermal management system, method and device for an electric vehicle, which is used to solve the problem that in the prior art, when the external environment temperature is low, the heat exchanger outside the vehicle will not be able to work stably due to frosting, resulting in a decrease in system performance. The problem of reduced thermal management efficiency

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