平板热管式锂离子电池热管理系统仿真分析研究

Simulation analysis of lithium-ion battery thermal management system based on flat heat pipe

关键词:  混合电推进  锂离子电池  高放电倍率  热管理  平板热管

Key words:  Hybrid electric propulsion  Lithium-ion battery  High discharge rate  Thermal management  Flat heat pipe

摘要:

锂离子电池是航空混合电推进系统的关键子系统，本文针对基于平板热管的航空锂离子电池热管理方案进行设计与性能评估。针对一款锂离子电池模组进行建模与验证，初步设计平板热管方案并进行仿真分析；在原方案基础上，对平板热管散热翅片进行结构优化设计并开展了实验验证，结果表明：优化后的方案可提高系统对流换热量。以优化后的平板热管为基础，结合航空器高空巡航工况的环境温度，平板热管换热性能将得到进一步提升：电池平均温度可降低10.6 ℃，降幅达18.83%。与水冷方案相比，平板热管优化方案散热能力与之相当，系统减重30%、能耗降低约63%。

Abstract:

Lithium-ion battery is the key subsystem of aviation hybrid electric propulsion systems. This paper designs and evaluates the thermal management scheme of aviation lithium-ion batteries based on flat heat pipe（FHP）. Firstly， the model of a lithium-ion battery module was established and verified. Besides， the FHP scheme was preliminarily designed and simulated. On the basis of original scheme， the structural optimization design of FHP cooling fins was carried out and the heat dissipation effect was validated by experiment. The results show that the optimized scheme can improve the heat transfer capacity of the system. Based on the optimized FHP and combined with the ambient temperature of aircrafts high-altitude cruising condition， the FHP heat transfer performance will be further improved. The battery average temperature can be reduced by 10.6 ℃ with a decrease of 18.83%. The heat dissipation capacity of FHP is equivalent to that of liquid cooling， but the system weight can be reduced by 30%， while the system energy consumption can be reduced by about 63%.