Furukawa Battery
Furukawa Battery
Furukawa Battery
Furukawa Battery
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
出版者
宇宙航空研究開発機構宇宙科学研究所
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
The thirtieth Space Energy Symposium (February 25, 2011. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan
抄録（英）
Li-ion battery, which has the advantage of high energy density, is coming into space usage in recent years. Furukawa Battery Co. Ltd. developed world's first Li-ion batteries for the asteroid explorer "HAYABUSA" of JAXA, which was launched in 2003. The batteries had rated capacity of 13.2 Ah, and continued to function normally for 3.5 years in space. Based on the fundamental technologies of these batteries, we developed 23.5-Ah Li-ion batteries for the Venus probe "PLANET-C", energy density and life performance of which were improved according to the mission requirement.The operational period of the batteries for PLANET-C can be divided into three phases; the ground storage of 1.5 years, the transfer to Venus of up to 2.5 years, and observation on the Venus orbit of over 2 years. During the batteries are stored on the ground, they are in a open-circuit state to prevent from capacity deterioration. On the transfer trajectory to Venus, the batteries retain the minimum voltage that is required for the safe-hold operation, because there is no eclipse. After Venus orbit insertion, a charge/discharge cycle operation starts.The spacecraft was successfully launched in May, 2010 and named "Akatsuki". The battery has functioned as expected in the launch operation, eclipse periods, and the Venus orbit insertion operation so far. The degradation trend of the onboard battery agreed well with that of the monitor battery on the ground and the prediction by a test using PM batteries.After the Venus orbit insertion failed last year, the spacecraft entered a new trajectory to reach at Venus six years later. Because the operational period will be much longer than originally planned, we are considering a new operational plan for the batteries to sustain as much capacity as possible.
内容記述
形態: カラー図版あり
形態: CD-ROM1枚
内容記述（英）
Physical characteristics: Original contains color illustrations
Note: One CD-ROM
金星探査機「あかつき」搭載バッテリセルの開発と運用
