关于阀控密封铅蓄电池容量与电导的相关性

摘要: 阀控密封铅蓄电池荷电态在50%以上时,其内阻(或电导)是看不出什么变化的.只是
荷电态在50%以下时,铅蓄电池的内阻才逐渐增大.若将荷电态在0至100%的全部铅蓄电池都统计进去,其容量与电导才有线性相关关系.然而对荷电态大于80%的在线使用的铅蓄电池而言,却不存在上述关系.因而不能用铅蓄电池的电导值去推断在线使用的铅电池的荷电态或健康状态.
关键词: 密封铅蓄电池, 内阻, 电导, 容量, 相关性
中图分类号: TM 912 文献标识码: A
Correlation between Capacity and Conductance of VRLA
Gui Chang-Qing
CSIC 712 Research Institute ( Wuhan Hubei 430064)

Abstract: As soon as the state-of-charge for VRLA was more than 50%,the internal resistance (or conductance) would not be changeable almost. Only when the state-of-charge was less than 50%, the internal resistance would become larger obviously. Although the correlation between capacity and conductance might exist for these batteries which state-of-charge wasfrom 0 to 100%, but this correlation would not exist for on-line batteries which capacity must be more than 80%. For this reason the state-of-charge or state-of-health for on-line batteries could not be predicted from it's values of conductance.
Keywords: VRLA, internal resistance, conductance, capacity, correlation

1. 历史回顾
十余年之前,国外报导了对1000Ah阀控密封铅蓄电池剩余容量与电导的统计结果,认为二者之间存在线性相关关系[1],于是有人提出用在线检测到的VRLA电导值去推断电池的剩余容量, 还有人试图根据电导测试结果去予测电池的使用寿命.
然而实际得到的结果并不令人满意.本人曾对阀控密封铅蓄电池电导测试原理与实践作了论述[2],认为对于容量在80%以上的在线使用的阀控密封铅蓄电池,是无法利用电导值去评估电池的荷电态和予测电池的使用寿命的.随后又根据电化学中的交流阻抗原理分析了阀控密封铅蓄电池交流阻抗参数与荷电态的关系[3],并指出了电导测试工作的局限性.
最近看到几位作者(请见2004年”通信电源技术”