中国空间科学技术

中国空间科学技术 ›› 2026, Vol. 46 ›› Issue (3): 181-191.doi: 10.16708/j.cnki.1000-758X.2026.0046

• 《中国空间科学技术（中英文）》创刊45周年专刊 • 上一篇    下一篇

Solar array design and verification for Tianwen-2

WU Yuemin1,2，YU Jingjun2，LI Xuli1，YIN Xingyue3，HAO Xiaoli3，ZHANG Qiming3, ZENG Fuming1，ZHANG He1   

  1. 1.Beijing Institute of Spacecraft System Engineering，China Academy of Space Technology, Beijing 100094, China
    2.Institute of Robotics, Beihang University, Beijing 100191, China
    3.CETC Lantian Technology Co., Ltd., Tianjin 300384, China
  • 收稿日期:2026-01-21 修回日期:2026-03-28 录用日期:2026-04-12 发布日期:2026-05-21 出版日期:2026-05-31

Solar array design and verification for Tianwen-2

WU Yuemin1,2，YU Jingjun2，LI Xuli1，YIN Xingyue3，HAO Xiaoli3，ZHANG Qiming3, ZENG Fuming1，ZHANG He1   

  1. 1.Beijing Institute of Spacecraft System Engineering，China Academy of Space Technology, Beijing 100094, China
    2.Institute of Robotics, Beihang University, Beijing 100191, China
    3.CETC Lantian Technology Co., Ltd., Tianjin 300384, China
  • Received:2026-01-21 Revision received:2026-03-28 Accepted:2026-04-12 Online:2026-05-21 Published:2026-05-31

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摘要： Tianwen-2 is China's first mission for near-Earth asteroid sampling and main-belt comet exploration. After analyzing the orbital environment and operational requirement, a circular flexible solar wing configuration is adopted, addressing key constraints including operation under low-intensity low-temperature (LILT) conditions, reliable stowage during launch, and long-term tension management. High-efficiency triple-junction GaAs solar cells are developed through bandgap engineering and edge passivation, achieving an average conversion efficiency >34% at 2.5 au. The blanket design uses a modular, mirror-symmetric layout with planarized circuits and lightweight backing to ensure reliable stowage. Thermal simulation and tension compensation are employed to manage internal stresses, while ultra-lightweight support structures and planar stress-relief interconnects maintain ribbon stresses below 80% of the fatigue limit. Simulation and ground testing confirm that the array meets the mission's power needs, with post-deployment verification validating its output performance and operational stability.


关键词: Tianwen-2, deep space probe, solar array, flexible solar wing, low-intensity low-temperature (LILT)

Abstract: Tianwen-2 is China's first mission for near-Earth asteroid sampling and main-belt comet exploration. After analyzing the orbital environment and operational requirement, a circular flexible solar wing configuration is adopted, addressing key constraints including operation under low-intensity low-temperature (LILT) conditions, reliable stowage during launch, and long-term tension management. High-efficiency triple-junction GaAs solar cells are developed through bandgap engineering and edge passivation, achieving an average conversion efficiency >34% at 2.5 au. The blanket design uses a modular, mirror-symmetric layout with planarized circuits and lightweight backing to ensure reliable stowage. Thermal simulation and tension compensation are employed to manage internal stresses, while ultra-lightweight support structures and planar stress-relief interconnects maintain ribbon stresses below 80% of the fatigue limit. Simulation and ground testing confirm that the array meets the mission's power needs, with post-deployment verification validating its output performance and operational stability.

Key words: Tianwen-2, deep space probe, solar array, flexible solar wing, low-intensity low-temperature (LILT)