摘要
研究了提高MH-Ni蓄电池高功率特性的几个技术手段和电解液成份对高功率MH-Ni蓄电池充电效率的影响。改进MH-Ni蓄电池正负极集流结构并配以薄长极板使用时,蓄电池内阻变小,大电流充放电性能明显提高;烧结负极比湿法拉浆负极的大电流放电性能更为优越。当采用合适的端面焊结构并配以薄长极板使用时,8AhD型MH-Ni蓄电池的内阻比普通8AhD型蓄电池的内阻降低1倍以上,维持在2.2mΩ左右,单体30A充电效率明显提高,30A放电平台提高100mV左右。随着电解液中Na+和Li+含量的提高,MH-Ni蓄电池的高温充放电效率得到改善,但低温放电性能受到限制。当控制质量比m(KOH)∶m(NaOH)∶m(LiOH·H2O)=36∶43∶6时,13AhF型高功率MH-Ni蓄电池在30℃和40℃下的3A充放电效率分别是:98.00%和95.00%;-18℃下,1C(13A)放电效率为91.00%。
Abstract:In this paper, both some techniques for improvement high power characteristics and effect of the electrolyte components on the charge efficiency of nickel-metal hydride battery have been investigated. If the structure of current collectors are improved and combined with thin and long electrodes, the internal impedance of the cell will decrease, and the characteristic of charge/discharge at a high current will be improved remarkably. Meantime, the discharge characteristic at a high current of sintered negative electrode is superior to that of pasted negative electrode .When combined with thin and long electrodes, and current collected by head face welding, the internal impedance of 8 Ah D type Ni-MH battery is laid down to 2.2 mΩ( half ofthenormal cell ), the charge efficiency at 30 A is improved and the discharge mid-voltage is raised about 100 mV. The charge efficiency at high temperature is improved with the increase of Na^+ and Li^+ contained in the electrolyte. When the mass ratio ofm(KOH) : m(NaOH) : m(LiOH·H2O)=36 : 43 : 6, the charge/discharge efficiency of 13 Ah F type battery with constant current 3 A at 30 ℃,40 ℃ is 98.00% / 95.00%, respectively and the discharge efficiency with constant current 1 C(13 A ) at -18 ℃ is 91.00%.
出处
《电源技术》
CAS
CSCD
北大核心
2005年第12期826-830,共5页
Chinese Journal of Power Sources
关键词
高功率MH—Ni蓄电池
烧结负极
湿法拉浆负极
端面焊
内阻
充放电效率
high-power nickel-metal hydride battery
sintered negative electrode
pasted negative electrode
head face welding
Internal impedance
charge/discharge efficiency