基于多频点测试的蓄电池短时放电容量诊断

摘要

The polarization capacitor parameter of electric double layer in the Thevenin battery model is identiifed by multi-frequency testing. The regularity which the zero-crossing time of polarization capacitor change rate curve is half the time of completely discharge process is got by analyzing the change of the polarization capacitor during 0.1C constant current discharge process for battery capacity check. According to this, the actual capacity of the battery is double that at the zero-crossing time. The rapid short-term battery capacity diagnosis can be realized because the test time is saved by 50 %. The operation cost of the capacity check and the safety risk of DC power supply system are reduced greatly.%多频点测试技术可辨识出蓄电池 Thevenin模型中双电层极化电容参数。通过分析满充蓄电池0.1C恒流核容放电过程极化电容的变化，得出极化电容变化率曲线过零点的时刻为完全放电过程用时一半的时间点的规律。据此得出蓄电池实际容量为该时刻为止放出电量的2倍。用时节约了50%左右，实现了快速短时的蓄电池容量诊断，极大降低了核容过程的操作成本和直流电源系统安全风险。