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Li-Ion Battery Operations and Life Optimization

Balan, Arvind Kumar und Lenzen, Christoph (2017) Li-Ion Battery Operations and Life Optimization. 68th International Astronautical Congress, 2017-09-25 - 2017-09-29, Adelaide.

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Kurzfassung

The challenges in satellite operations are multi-fold. The battery management in a satellite is among the toughest challenges to any manufacturer and the operations team. The lifetime in orbit is most of the time designed by the battery health. This paper deals with the efforts undertaken at the German Space Agency (DLR) to optimize the battery life on their satellite TerraSAR-X. The TerraSAR-X was launched in 2007 and has successfully completed its design life of 5 years. In the past couple of years during the eclipse phase the battery voltages have dropped below the nominal end of discharge values. The satellite ies in a sun-synchronous "Dawn-Dusk" orbit where eclipses occur between April and August. Further, the duration of the eclipse in every orbit also varies during this period. The spacecraft has a power requirement of roughly 5000 W. During eclipse the full power required by the spacecraft bus and the payload is supplied by the batteries. In the summer of 2014 during the peak eclipse duration combined with instrument operations, a low voltage critical event was noticed. The same effect was noticed more than once during the summer of 2015. Although the noticed values were far from any safe-mode trigger limits it was an indication of some phenomenon other than the degradation within the batteries caused by ageing. It was found upon detailed investigation by the spacecraft manufacturer that the Li-Ion batteries show a secondary effect which at the initial stages of its life is considered negligible. This effect is called as the "diffusion rate effect". Several deep-discharge test cycles were performed in order to gather data for further investigation. Initial understanding of the tests showed that there was a sudden drop of battery voltage for even short payload operations but detailed investigation revealed that the drop is nearly linear beyond the first dip. Based on this discovery the existing battery model was optimized. This optimized model now accounts for the \diffusion rate effect" by controlling the maximum allowable discharge energy for every payload operation supported by the batteries. This paper discusses in detail the investigation, analysis of diffusion effect and the optimization of the battery model. The updated model was tested during the summer of 2016 and the results are presented in this paper.

elib-URL des Eintrags:https://elib.dlr.de/116831/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Li-Ion Battery Operations and Life Optimization
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Balan, Arvind KumarArvind.Balan (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lenzen, ChristophChristoph.Lenzen (at) dlr.dehttps://orcid.org/0000-0003-3542-6303NICHT SPEZIFIZIERT
Datum:September 2017
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Battery Lifetime, Satellite Operations, Li-Ion Battery
Veranstaltungstitel:68th International Astronautical Congress
Veranstaltungsort:Adelaide
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:25 September 2017
Veranstaltungsende:29 September 2017
Veranstalter :International Astronautical Federation
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - TSX/TDX Missionsbetrieb
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Raumflugbetrieb und Astronautentraining > Missionsbetrieb
Hinterlegt von: Schneider, Beatrice
Hinterlegt am:11 Dez 2017 09:41
Letzte Änderung:24 Apr 2024 20:21

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