宇宙機搭載用大型リチウムイオン電池の研究開発

摘要

リチウムイオン電池の宇宙機への搭載の機運が高まってきており，HTV（宇宙ステーション補給機） への登載等徐々に実績が得られつつある．我々の部署ではこれまでリチウムイオン電池の人工衛星等への適用を目指して，充放電サイクル寿命特性評価を中心に評価を行っている．本発表では現在登載予定のリチウムイオン電池の寿命評価状況及び軽量・長寿命化等の高性能化に向けた研究開発状況について報告する．%The specific advantages of lithium-ion technology in energy density and working voltage offer the possibility of huge reductions in battery mass. To apply the lithium-ion battery in a spacecraft, we began conducting the long-term evaluation on 100 Ah-class lithium-ion cells by simulating satellite's operation in 1999. The H-II Transfer Vehicle(HTV) was successfully launched in September 2009, and this was the first practical spacecraft which used the large capacity 100Ah lithium ion battery as the electric storage device in JAXA. In this paper, we report a review of the cycle-life test results of the large-capacity lithium-ion cells and latest study of imporved higher capacity lithium -ion cells.