2026-03-14T03:13:14Z https://jaxa.repo.nii.ac.jp/oai

oai:jaxa.repo.nii.ac.jp:00008118 2023-06-21T07:28:11Z 1543:1562:1578 1887:1891

Investigation of low temperature storage of Li ion cells for space applications 宇宙用リチウムイオン電池の冷凍保管についての検討 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 Kubota, Masaaki Yamamoto, Masahiro Oto, Hiroki Eguro, Takashi Takahashi, Keiji Hirose, Kazuyuki Tajima, Michio 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 space technology experiment lithium ion battery low temperature storage electric discharge open circuit voltage cryogenic temperature storage stability Li 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. 資料番号: AA0047275002 conference paper 宇宙航空研究開発機構宇宙科学研究本部 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS) 2004-06 第23回宇宙エネルギーシンポジウム　平成15年度 6 10 The 23rd ISAS Space Energy Symposium March 9, 2004 https://jaxa.repo.nii.ac.jp/records/8118 jpn metadata only access