仿生叶脉的非均匀流道优化及电池液冷板传热特性研究OA

A biomimetic liquid cold plate with a leaf-vein-inspired nonuniform channel structure is proposed to improve the thermo-hydraulic performance of lithium-ion battery thermal management systems.The proposed cold plate was divided into three functional regions:inlet,transition outlet.The effects of branch number,spacing,and width on coolant distribution,temperature uniformity,and pressure drop were systematically investigated using numerical simulations.The results demonstrate that increasing the branch number reduced pressure drop but had little effect on the maximum temperature.An appropriate nonuniform branch spacing in the inlet region improved coolant redistribution and battery temperature uniformity with an acceptable hydraulic penalty.The effect of branch width depended strongly on the region.Increasing the width in the inlet and outlet regions reduced flow resistance but weakened thermal performance,whereas a moderate increase in the transition region improved temperature uniformity.Using orthogonal testing and equal-weight methods,a comprehensive performance function was constructed to determine the optimal combination of structural parameters.This optimization yielded a maximum temperature(Tmax)of 39.51℃,a temperature difference(∆T)of 11.13℃,and a pressure drop of 50.11 Pa.Compared with the original structure(Tmax=40.38℃,∆T=12.44℃,and ∆P=45.95 Pa),these values represent a 2.15％decrease in Tmax,a 10.53％decrease in ∆T,and a 9.05％increase in ∆P.These results demonstrate that the proposed nonuniform design significantly improves the temperature uniformity of lithium-ion batteries while suppressing the temperature peak at only a moderate hydraulic cost,demonstrating excellent comprehensive thermo-hydraulic performance.