主办:陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊:1976年

Automobile Applied Technology ›› 2025, Vol. 50 ›› Issue (6): 82-87.DOI: 10.16638/j.cnki.1671-7988.2025.006.013

• Design and Research • Previous Articles    

Research on Optimization of Thermal Interface Materials for High Power LED Junction Temperature

XU Shengliang1,2 , WANG Zhan2 , JIANG Yejie2 , YAN Zi2 , LIU Binbin2 , LU Biaowu3   

  1. 1.Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology; 2.GAC Automotive Research & Development Center; 3.National Electric Power Investment Smart Energy Innovation College, Shanghai Jiao Tong University
  • Published:2025-03-26
  • Contact: XU Shengliang

热界面材料对大功率 LED 结温的优化研究

徐胜亮 1,2,王占 2,姜叶洁 2,晏紫 2,刘彬彬 2,卢彪武 3   

  1. 1.华中科技大学 武汉光电国家研究中心; 2.广州汽车集团股份有限公司汽车工程研究院; 3.上海交通大学 国家电投智慧能源创新学院
  • 通讯作者: 徐胜亮
  • 作者简介:徐胜亮(1993-),男,博士,研究方向为汽车车灯设计与开发
  • 基金资助:
    广州汽车集团有限公司和华南理工大学合作项目(X0M-CS-3)

Abstract: Under the background of compact and versatile automotive headlights, high-power light emitting diode (LED) with high brightness and small luminous area are widely used in automotive headlights, but this also brings heat dissipation problems. The heat dissipation efficiency will affect the junction temperature of the LED, thus affecting the luminous efficiency and working life of the LED. Thermal interface materials can effectively reduce thermal resistance and improve the heat dissipation efficiency of high-power LED. This paper takes LED headlamp as the research object,puts forward the scheme of solder as the thermal interface material, and compares the effect of three kinds of thermal interface materials commonly used in headlamp on the junction temperature of high-power LED. The numerical simulation results show that the thermal conductivity of solder thermal interface materials is better than that of the other three thermal interface materials. For the four thermal interface materials, the current power and junction temperature of LED are linearly positive correlated. The influence of thermal conductivity, thickness and cross section area of thermal interface materials on LED junction temperature is further analyzed, which can be used to guide the selection of thermal interface materials.

Key words: thermal interface materials; headlamp; high-power LED; junction temperature

摘要: 在造型紧凑、功能多样的汽车车灯大背景下,亮度高、发光面积小的大功率发光二极 管(LED)被广泛用于汽车前照灯,但由此也带来散热问题。散热效率会影响 LED 的结温, 从而影响 LED 的发光效率和工作寿命。热界面材料可以有效地降低热阻,提高大功率 LED 的散热效率。文章以 LED 前照灯为研究对象,提出焊锡作为热界面材料的方案,对比三种车 灯常用的热界面材料对大功率 LED 结温的影响。数值模拟仿真结果表明,焊锡热界面材料的 导热能力优于其他三种热界面材料,对于四种热界面材料,LED 的通电功率和结温都呈现线 性正相关。文章还进一步分析了热界面材料的导热率、厚度、截面面积对 LED 结温的影响, 可用于指导热界面材料的选取。

关键词: 热界面材料;前照灯;大功率 LED;结温