Abstract
Based on good LEO lifetime tests results, Saft proposes currently VES16 Lithium-ion for 12 years mission in Low Earth Orbit (LEO) up to 30%DoD or more within a temperature range from +10°C to +30°C.The first flight experimentation started at the end of 2015, confirming its ability to withstand the environmental stresses induced by a space launch and the in-flight constraints generated by a LEO mission.The upcoming launches scheduled from 2016 will significantly increase the flight heritage of this cell.From the beginning of VES16 Lithium-ion cell development, a wide lifetime tests program has been implemented in order to evaluate the different degradation modes due to the conditions applied in LEO cycling, as presented in Table 1.This program has allowed assessing the influence of different parameters such as EOCV (End Of Charge Voltage), DoD (Depth of Discharge), charge current and temperature.New MP176065 XTD Lithium-ion cell, developed & qualified by Saft, with an operating range extended from −40°C to +85°C, has already been selected for EXOMARS Rover mission.Promising results in accelerated LEO cycling conditions at 30%DOD has been observed and compared to VES16 lithium-ion cell results. Manufactured on a mass production industrial line, this cell is well suited for low cost missions (eg. Mega Constellations…).The article will thus present the whole LEO cycling results available for the two cells, and will provide afterwards the correlation status of Saft Li-ion Model (SLIM) with all the experimental data acquired.
Highlights
The article will present the whole Low Earth Orbit (LEO) cycling results available for the two cells, and will provide afterwards the correlation status of Saft Li-ion Model (SLIM) with all the experimental data acquired
The first flight experimentation started at the end of 2015, confirming its ability to withstand the environmental stresses induced by a space launch and the in-flight constraints generated by a LEO mission
This chapter focuses on the analysis of the life-test results performed in accelerated (A) or in real time (RT) mode according to VES16 lithium-ion cells LEO lifetests program described in Tab
Summary
This chapter focuses on the analysis of the life-test results performed in accelerated (A) or in real time (RT) mode according to VES16 lithium-ion cells LEO lifetests program described in Tab.1 These LEO Life-Test results have permitted to assess the influence of the cycling parameters such as DOD/charge current, EOCV and temperature on the evolution of the cell electrical characteristics such as EODV, Capacity, Internal Resistance and Energy, as presented in the following paragraphs. The evolution of these cell electrical characteristics is measured through a check-up sequence, involving a residual discharge and a reference test at 4.1Volts @20°C, performed at 500 cycles, every 1000 cycles. It allows demonstrating the correlation of the LEO life-test results with the SLIM V3 ageing prediction model
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