Abstract:
One of the main objectives was to work on the definition of the specific conditions required to achieve safe end of mission passivation of Li-ion battery cells and to dev...Show MoreMetadata
Abstract:
One of the main objectives was to work on the definition of the specific conditions required to achieve safe end of mission passivation of Li-ion battery cells and to develop an electrical power management system for small satellites and constellations that would allow battery passivation. The ultimate aim is to provide a solution to meet Space Debris Mitigation requirements for small telecom spacecraft. The project is a multidisciplinary activity addressing the electronic passivation system and the Li-ion battery using COTS 18650 cells. The electronic passivation device is a system designed to safely passivate the satellite battery at the End-of-Life. It is connected between the battery and the PCDU and operates transparently during the nominal life of the satellite. When required, control logic operates redundant relay-based switches to isolate the battery and safely discharge it to a load. At the end of the discharge phase, the battery is galvanically isolated. A full passivation test is performed, emulating a real-world scenario and demonstrating the passivation of the battery behaviour during discharge in representative and worst-case environmental conditions. On the battery side, two types of Li-ion cells have been selected that are suitable for typical LEO and GEO applications. Accelerated and mission representative cycling was performed over the past year. For each cell type, 4 modules 2s2p size have been manufactured to be tested in different test conditions. In addition, abuse tests are performed to study the safety mechanism of the Li-ion cell when exposed to extreme operating conditions such as over-discharge, over-charge, external short-circuit and over-temperature.
Published in: 2023 13th European Space Power Conference (ESPC)
Date of Conference: 02-06 October 2023
Date Added to IEEE Xplore: 06 November 2023
ISBN Information: