基于复合相变材料的锂电池热管理系统数值模拟与温控性能研究OA

[Objectives]The performance of lithium batteries is highly sensitive to temperature changes.To address the heat generation during the charge and discharge process of energy storage batteries under extreme operating conditions,a thermal management system for batteries based on paraffin/expanded graphite composite phase change material(CPCM)is designed.[Methods]Based on Bernardi's heat generation theory,the user-defined function(UDF)source term of the battery numerical model is developed to investigate the effects of different discharge rates,CPCM arrangement types,densities,and thicknesses on the thermal management performance of the system.The temperature control performance of the system is further optimized by coupling it with an aluminum metal casing.[Results]Compared with low discharge rates,CPCM has a more significant effect on battery thermal management at high discharge rates.The anisotropy of the internal thermal conductivity of the battery and the contact area between the CPCM and the battery surface play key roles in heat transfer efficiency and temperature distribution.Appropriately increasing the density and thickness of the CPCM helps enhance the temperature control performance of the system.In addition,coupling the 1.6 mm-thick aluminum casing enhances the cooling performance while maintaining good battery pack efficiency.[Conclusions]The research findings can provide a reference for the design and optimization of thermal management systems for batteries in related energy storage applications.