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Other TitleInvestigation of low temperature storage of Li ion cells for space applications
Author(jpn)久保田 昌明; 山本 真裕; 大登 裕樹; 江黒 高志; 高橋 慶治; 廣瀬 和之; 田島 道夫
Author(eng)Kubota, Masaaki; Yamamoto, Masahiro; Oto, Hiroki; Eguro, Takashi; Takahashi, Keiji; Hirose, Kazuyuki; Tajima, Michio
Author Affiliation(jpn)古河電池; 古河電池; 古河電池; 古河電池; 宇宙航空研究開発機構 宇宙科学研究本部; 宇宙航空研究開発機構 宇宙科学研究本部; 宇宙航空研究開発機構 宇宙科学研究本部
Author Affiliation(eng)Furukawa Battery Co. Ltd.; Furukawa Battery Co. Ltd.; Furukawa Battery Co. Ltd.; Furukawa Battery Co. Ltd.; Japan Aerospace Exploration Agency Institute of Space and Astronautical Science; Japan Aerospace Exploration Agency Institute of Space and Astronautical Science; Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Issue Date2004-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第23回宇宙エネルギーシンポジウム 平成15年度
The 23rd ISAS Space Energy Symposium March 9, 2004
Start page6
End page10
Publication date2004-06
AbstractLi ion cells for space applications possess a high specific energy and the high discharge voltage, having recently begun to be adopted as space batteries in terms of their lightweight and reliability requirements. In the case of operating the Li ion cells as the batteries of spacecraft for planetary exploration applications, the batteries are to stand by without supplying power in a transfer orbit during a considerable long period of time and be operated to conduct scientific observations, critical events, and so on in an orbit around a planet after arriving there. The batteries must be prevented from degrading their performance during the transfer orbit period of time. In general, degradations of charge and discharge characteristics of the Li ion cells are caused when they are under storage in a state of open circuit conditions during a long duration. The higher their temperature and state of charge (SOC), the more noticeable this phenomenon becomes. Therefore, it is necessary to maintain the cells in a better state and control it in a simple storage method. Then, a degradation of characteristics of the Li ion cells was investigated under storage in the open circuit state at a low temperature of less than - 20 C for three months. A decrease in their open circuit voltage (OCV) or an increase in their temperature due to short circuit failures, or a decrease in OCV due to the self discharge of the cells did not occur and both OCV and the temperature were kept constant; it was confirmed that their short circuit failures did not break out when the Li ion cells were frozen at a temperature of less than - 70 C. After the low temperature storage, there was no difference between the storage cells and cells without storage even at any temperature by investigating a fine hole distribution of their positive electrodes and observing the cells with SEM.
Keywordsspace technology experiment; lithium ion battery; low temperature storage; electric discharge; open circuit voltage; cryogenic temperature; storage stability; 宇宙技術実験; リチウムイオン電池; 低温保存; 放電; 開放電圧; 極低温; 保存安定性
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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