摘要
针对航天器用INR33650锂离子电池,系统探究电解液质量(12~24 g)对其性能的影响。通过化成、老化、过充及循环测试,发现电解液质量明显影响放电容量、电压平台及内阻,但对过充安全性能、循环寿命影响较小。电解液质量为16~20 g时,电解液充分浸润电极,电性能稳定、循环寿命长、比能量高。电解液质量低于16 g时,储气空间增大,部分抵消了电极浸润不足对循环寿命的影响,但过充电池温升较高(31.1℃)。电解液质量增至22~24 g(壳体加高5 mm)虽可缓冲电极的机械应力、增大储气空间,略微提升循环寿命,但不符合轻量化要求。综合分析,确认INR33650电池最佳电解液质量为16~20 g(电解液体积系数为1.31~1.65),为航天器用高比能电池设计提供了技术支撑。
Focusing on the INR33650 lithium-ion battery used in spacecraft,the influence of the electrolyte quantity(12-24 g)on its performance was systematically explored.Through formation,aging,overcharging,and cycling tests,it’s found that the electrolyte quantity significantly affects the discharge capacity,voltage plateau,and internal resistance,but has limited impact on the overcharging safety performance and cycle life.When the electrolyte quantity is 16-20 g,the electrolyte fully wets the electrodes,resulting in stable electrical performance,long cycle life,and high specific energy.When the electrolyte quantity is less than 16 g,the increased gas storage space partly offsets the impact of insufficient electrode wetting on the cycle life,but the temperature rise of the overcharged battery is relatively high(31.1℃).Although increasing the electrolyte quantity to 22-24 g with a 5 mm increase of the case height can buffer the stress of the electrodes and increase the gas storage space,slightly improving the cycle life,it does not meet the requirements of lightweight.Through comprehensive analysis,it’s confirmed that the optimal electrolyte quantity for the INR33650 battery is 16-20 g(the electrolyte volumetric factor of 1.31-1.65),providing technical support for the design of high specific energy batteries for spacecraft.
作者
吴金伟
檀帅林
WU Jinwei;TAN Shuailin(CETC Lantian Technology Co.,Ltd.,Tianjin 300384,China)
出处
《电源技术》
北大核心
2025年第10期2058-2065,共8页
Chinese Journal of Power Sources
关键词
锂离子电池
电解液质量
电解液体积系数
电性能
循环寿命
lithium-ion battery
electrolyte quantity
electrolyte volumetric factor
electrical perfor‐mance
cycle life
