铅炭电池析氢与负极电势关系的研究

Study on the relationship between hydrogen evolution and potential of negative plate in Pb-C batteries

阀控式铅炭电池的失水影响其高倍率部分荷电状态下的循环性能,采用计时电流法研究了不同炭含量铅炭负极板在不同温度、不同电势下的析氢行为,实验结果表明,铅炭负极电势比-1.25 V更负时析氢速率快速增加,正极电势比1.25 V更正时析氧速率快速增加,环境温度达到40℃以上加速负极析氢;为了防止铅炭负极析氢,铅炭电池的充电电压不应高于2.45 V。

Water loss of value regulated Pb-C batteries has great effect on the cycle life of the batteries under the conditions of HRPSoC. In this work, the hydrogen evolution behaviors of the negative plates with different quantity of carbon materials in various temperature and potential have been investigated by chronoamperometry. The results show that the rate of hydrogen evolution increases with lower potential of the negative plate when the potential is lower than -1.25 V, while the rate of oxygen evolution increases with higher potential of the positive plate when the potential is higher than 1.25 V. Moreover, the hydrogen behaviors of the negative plate will be accelerated when the temperature is higher than 40 ℃. In order to restrain the hydrogen evolution of the negative plate, the charge voltage of Pb-C batteries should below 2.45 V.