MH-Ni蓄电池自放电规律及其应用

Discipline about self-discharge of Ni-MH battery and its application

探讨了MH-Ni蓄电池的自放电变化规律及其在电池筛选方面的应用。MH-Ni蓄电池的自放电率随搁置时间的增加而增大,但增大幅度逐渐变小。其25℃下的变化规律可拟合为Boltzmann函数;蓄电池的自放电率随环境温度的增大而增大;极板表面积影响电池的自放电,搁置初期,电池自放电随极板表面积增大而降低,搁置后期(10～28d),电池自放电随极板表面积增大而增大。电池开路电压越低,其自放电越大。此外,MH-Ni蓄电池自放电率的一致性对循环寿命也有影响,同等条件下,自放电差异小的电池组,其循环寿命优于随机组合的电池组。

In this paper, both the discipline about self-discharge of Ni-MH battery and its application in cells＇ selection have been investigated. The self-discharge rate of Ni-MH battery increases with the increasing of interval in an open circuit state. The discipline about self-discharge at ambient temperature of 25 ℃ could be fitting as Boltzmann function; the self-discharge rate increases with the increasing of ambient temperature; the smaller the open circuit voltage is, the larger the self-discharge rate is. Furthermore, the consistence of the self-discharge rate has an effect on the cycle life of Ni-MH battery. At the same state, the cycle life of the battery of which the self-discharge diversity is smaller, is better than the one which is packed stochastically.