Application of Battery Hierarchical Thermal Management Strategy with Integrated Economic Optimization
CHEN Meng
TANG Dong
Abstract：To address the dual demand for thermal safety and energy efficiency optimization of power batteries in new energy vehicles,a 23 Ah prismatic lithium iron phosphate(LiFePO4)cell was selected as the research object.A titanium dioxide nanofluid pulsating heat pipe(PHP)was employed as the core cooling device,and a comprehensive thermal management system based on temperature-graded regulation and an economy-oriented coupling criterion was proposed and implemented.This system ensures battery thermal safety by dynamically adjusting fan speed according to real-time temperature monitoring,while introducing an economy criterion once the temperature requirement is satisfied,thereby achieving an optimal balance between cooling performance and energy consumption.Relying on a self-developed experimental platform,tests were carried out on both single cells and battery modules under different ambient temperatures(15℃,25℃,and 35℃).To simulate low-power operating conditions of electric vehicles,constant discharge rates of 0.5 C,1 C,and 1.5 C as well as variable-rate cycles were adopted.The results show that the proposed system can maintain the maximum temperature below 45℃,with the economy index reaching up to 91.7%,thereby demonstrating significant energy-saving advantages while ensuring thermal safety under low-power operating conditions.
Keywords：new energy vehiclespower batteryPHPthermal management strategyhierarchical control
Publication Date：2025-12-25
Online Publishing Date：2026-01-05(First online date of this platform, not the publication date of the document)
Pages：11( 9-19 )