基于TPMS与相变材料协同强化的电池散热系统设计OA

To address the thermal saturation caused by the low thermal conductivity of phase-change materials(PCMs)in lithium-ion-battery thermal-management systems(BTMSs),in this study,we have designed an innovative composite thermal-management system that features a triply periodic minimal surface(TPMS)exoskeleton arranged around the battery and integrated with the PCM.First,we verified the reliability of the coupled heat-transfer model for the battery-PCM through experimental tests of the internal resistance of the battery under different states of charge.Subsequently,using the maximum battery temperature(Tmax)and maximum temperature difference(∆Tmax)as key evaluation metrics,we compared the thermal-management performance of a pure PCM,a conventional fin-PCM,and a TPMS-PCM configuration systematically at a 3C discharge rate.The results show that,for the same TPMS volume fraction,the Tmax of the battery with the TPMS-PCM configuration is only 33.81℃,which is 3.71℃(2.17℃)lower than that of the pure PCM(fin-PCM)configuration,thus demonstrating its significant cooling advantage.Parametric analysis revealed that increasing the radial lattice density and volume fraction of the TPMS structure can enhance both cooling and temperature uniformity.Among the tested configurations,the P-30-60 structure(30%volume fraction,60° circumferential distribution)exhibited the best overall performance,with Tmax=33.74℃and ∆ Tmax=3.02℃.To achieve a synergistic balance between thermal performance and structural lightweighting,in this study,we propose a radially graded-density TPMS design(P-VD).This design employs a higher volume fraction near the battery side to enhance heat absorption and a dense thin-walled structure on the outer side to expand the heat-dissipation interface.Compared to the P-30-60 structure,the optimized P-VD structure reduces the volume of the TPMS metal skeleton by 30.4%,while further lowering Tmax by 0.54℃and ∆Tmax by 0.48℃,(∆Tmax decreased from 3.02℃to 2.54C,a reduction of 15.4%).Additionally,the heat absorption(dissipation)area increased by 66.89%(35.78%).The proposed surrounding TPMS-PCM architecture and its graded-density design effectively overcome the trade-off between material use and performance in homogeneous structures.This provides an innovative and feasible design approach and a technical pathway for achieving the multi-objective collaborative optimization of"efficient heat dissipation,excellent temperature uniformity,and lightweight structure"in BTMSs.