Battery thermal management method and system based on phase change latent heat of refrigerant

Abstract

The invention relates to a battery thermal management method and system based on refrigerant phase change latent heat, and the method comprises the following steps: reading system sensor information, calculating a target compressor rotating speed, an electronic throttle valve target opening degree and a pressure release valve switching signal through an algorithm according to a read sensor signal, and driving a compressor fan according to a target control signal, the system comprises a compressor driver, a condenser fan, a gas-liquid phase change refrigeration plate, a control unit, a pressure sensor and a temperature sensor, the compressor is connected with the condenser through a pipeline, and the condenser is connected with the gas-liquid phase change refrigeration plate. According to the battery thermal management method and system based on the phase change latent heat of the refrigerant, the control targets of high refrigeration speed, high refrigeration intensity and high temperature uniformity are achieved, the requirement of high power charging and discharging heat generation power can be met, and therefore the thermal safety performance of an electric vehicle is guaranteed.

Description

technical field [0001] The invention relates to the technical field of battery thermal management, in particular to a battery thermal management method and system based on refrigerant phase change latent heat. Background technique [0002] Electric vehicles have become an effective way to solve energy and environmental problems, so they have been widely promoted and applied. Batteries are the power source of electric vehicles, but the performance, life and safety of power batteries and battery packs are closely related to temperature. When the battery is low, the available power and capacity of the battery will be significantly reduced, and the battery capacity will be irreversibly attenuated, and the lithium precipitation caused by the battery overcharge may form lithium dendrites to puncture the diaphragm, causing internal short circuits and burying safety hazards. When the temperature of the battery When it is too high, it will accelerate the progress of battery side reac...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a battery heat management method and system based on refrigerant phase change latent heat, which has the advantages of reliable battery cooling speed and cooling intensity, and can maintain temperature consistency, etc., and solves the problem of electric vehicles. The cooling speed and cooling intensity of the battery are insufficient, and it is difficult to manage consistently, thus affecting the thermal safety performance of the battery

Images