Abstract: Aiming at the problems faced in the thermal balance test of Chang’e-5 probe, a set of thermal balance test scheme was constructed, and a thermal balance test method was proposed based on the analysis of the current situation of thermal balance test technology of spacecraft at home and abroad, as well as the principle of full verification, effectiveness and comprehensiveness. A special infrared absorption space heat flux simulation method was used. The typical test conditions were designed, and the test technical process was optimized. The results of thermal balance test combined with on-orbit flight show that the thermal balance test scheme can effectively verify the correctness of thermal control design, that the temperature impact caused by the deviation of the space heat flux simulation device does not exceed 2℃, and that the setting of test conditions and the technical process is reasonable. The correlation of thermal analysis model can make the thermal analytical model more accurate and reliable.

Key words: Chang’e-5 probe, thermal control, thermal design, thermal balance test, space heat flux