低温环境下电动汽车余热回收系统设计及能耗特性OA

Aiming at the core problems of high energy consumption and range attenuation of electric vehicles under low-temperature conditions,an integrated new thermal management system with motor waste heat recovery was designed,and the synergistic utilization of waste heat and heat pump air conditioning was realized through multi-circuit coupling.Based on the plate heat exchanger and four-way reversing valve,three flexible-switching waste heat recovery methods were constructed,and different waste heat recovery methods showed unique advantages in energy efficiency,heating rate,and defrosting function,respectively.At the same time,a new waste heat recovery method was proposed,which flexibly switched different waste heat recovery methods by setting temperature thresholds,and the research was carried out using Changchun,Beijing,and Shanghai as scenarios.The results showed that when the new waste heat recovery method ran for 6 000 s,it reduced energy consumption by 24.96%,47.39%,and 59.85%,respectively,compared with waste heat recovery method 3,which significantly improved the low-temperature energy utilization efficiency of the whole vehicle.The research results can provide theoretical support and technical reference for the integrated innovation and low-temperature performance optimization of electric vehicle thermal management systems.