Experimental Verification of Discharge of Two Parallel Sets of Batteries in Mars Probe During EDL

Mars exploration missions have the characteristics of diversification and complex environment, realize Mars circumnavigation, landing, and patrol, and carry out Mars global and comprehensive circumnavigation detection and regional patrol detection. Based on the complex characteristics of tight timing in the entry, descent, and landing (EDL) segment, irreversible events, non-interference from the ground, and large time delays, this paper proposes an architecture and strategy of power system. During the EDL phase of the probe, the Mars rover lithium-ion battery pack is used as a backup for the lithium fluorocarbon battery pack of entry stage for supplementary power supply. The two sets of battery packs parallel discharge to complete the task of entering and landing. The strategy is verified by discharge experiment, and the effectiveness of the parallel discharge is further obtained by test data of the two sets. The proposed strategy is to ensure the reliability and safety of the power system under the complex working conditions of the EDL section.