Preheating of Engine-Power Battery for Hybrid Electric Vehicle Based on Waste Heat Recycling Utilization

DING Peng; ZHANG Meijuan; GU Xiaoyong; ZHANG Pengbo; GAO Liang

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (1) : 18-26.

DING Peng^1,2,ZHANG Meijuan^1,2,GU Xiaoyong^1,2,ZHANG Pengbo^1,3,GAO Liang¹

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Abstract

For the issues of poor low-temperature performance of hybrid vehicle power battery and difficulty in engine starting, a method for coupled utilization of waste heat from the power battery and engine cooling system was proposed. The waste heat from the engine was utilized to heat the battery cooling liquid through an intermediate heat exchanger composed of phase change materials, and the heated battery cooling liquid flowed into the engine water jacket to directly preheat the engine. The heat transfer law of battery and engine cooling liquid was discussed, a waste heat recovery model was constructed, a bidirectional preheating model based on waste heat recovery was established, and the simulation was conducted by using ANSYS software. A bidirectional preheating device based on multistage series heat exchanger was designed to achieve automatic bidirectional preheating functionality using waste heat. Low-temperature preheating experiments for hybrid vehicles were finally carried out. The results show that the engine block temperature remains at 40 ℃ after preheating by the battery waste heat, and the engine cooling waste heat maintains the internal battery temperature at 30 ℃, which effectively improves the working environment. Meanwhile, during the engine low-temperature starting process, HC and CO emissions reduce by over 40%, verifying the superiority of the proposed method.

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DING Peng,ZHANG Meijuan,GU Xiaoyong,ZHANG Pengbo,GAO Liang. Preheating of Engine-Power Battery for Hybrid Electric Vehicle Based on Waste Heat Recycling Utilization[J]. Vehicle Engine. 2025, 0(1): 18-26