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Erstellt / Aktualisiert 13.02.2021 / 04.03.2021
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overview iss

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Why do low-earth orbit S/C need more total battery capacity, meaning more batteries versus those in geostationary orbit for the same energy to be stored.

whats DOD

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DOD - 10 years; 1000 Wh; 60 Wh/kh --> calculate battery mass LEO/ GEO

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5 secondary batteries

NiCd

NiH2

LiIon

NiMH

Li-poly

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Properties NiCd

-Exhibits memory effect,

-Environmental concerns (Cd)

-Extensively used till mid-1980s

 

28-32 Wh/ kg

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properties NiH2

-No memory effect,

-Highly reliable operation

 

35-65 Wh/kg

-Extensively used since mid-1980s

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properties LiIon

Very sensitive to over-charge and over discharge, -> Needs complex charge control for high number of single cells

-High self-discharging rate @ high temperatures

-Energy density degradation over time independent on use

-Often over 50% degradation after 150 cycles at temperatures <-5°

 

-mission @ low cycle life-temperature problems-small satellites, short mission time

 

70 - 150 Wh

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Li-poly

- Performance temperature dependent

-Under evaluation (ESA, ESTEC)

100-200 Wh