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深空探测用锂离子蓄电池在轨管理策略的研究
郑见杰, 杜园, 王炜娜, 罗广求
天津空间电源科技有限公司 天津市
摘要:
深空探测器、高轨卫星工作周期内地影时间较短,储能电池长期处于搁置状态,而在存储过程中由于界面副反应的存在会导致持续的锂离子电池容量衰降,影响储能电池的使用寿命。通过dV/dQ曲线分析、交流阻抗分析和解剖分析发现在存储过程中活性Li损失是导致锂离子电池容量损失的主要原因,在100%SoC状态下时还会导致电解液在负极表面的分解加剧,引起正极的界面膜阻抗Rsei和颗粒间接触阻抗RcroC出现明显的增加。深空探测器电源系统在存储期间为了减少过放电风险,并减少不可逆容量损失,应将蓄电池的荷电状态控制在20%SoC左右,并定期进行充电。
关键词:  锂离子电池;日历寿命;可逆容量衰降;
DOI:
分类号:TQ152
基金项目:
On Orbit Management strategy of Lithium ion Batteries for Deep Space Exploration
ZHENG Jian-jie, DU Yuan, WANG Wei-na, LUO Guang-qiu
Tianjin Space Power Technology Co,Ltd
Abstract:
During Deep space detectors’ and GEO satellites’ lifetime, the batteries work occasionally and storage most of the time. Capacity would continuously decrease as result of side reaction during storage. Through dV/dQ curve、EIS and cell disassemble analysis, the active Li loss is the main reason for capacity degradation. When the cell is stored at 100%SoC, the electrolyte decomposition on the cathode would cause the RSEI and RCR of cathode increasing significantly. To prevent the battery over discharge and reduce the irreversible capacity lost, the battery should be kept around 20%SoC and be charged regularly.
Key words:  Lithium ion batteries; Calendar life; Reversible capacity degradation