基于脉冲电流放电法的蓄电池内阻在线检测研究

针对现有蓄电池内阻检测方法存在的精度差、复杂性高和影响蓄电池寿命等缺点，研究了一种基于脉冲电流放电法的内阻在线检测系统。通过控制开关管的通断使蓄电池对负载进行脉冲电流放电，同时采集放电前后的电压及电流，经交流差分电路放大后将交流信号转变为直流信号，再通过滤波电路处理后进行模数转换，最后由MSP430单片机进行分析处理，实时在线计算蓄电池内阻。实验结果表明，本文提出的脉冲电流放电法需要测量的参数较少，降低了系统的复杂性，提高了在线测量蓄电池内阻的精确度，同时避免了瞬间大电流对蓄电池的损害，延长了使用寿命。

Research on battery internal resistance online detection based on pulse current discharge method

In view of the shortcomings of the existing methods for detecting the internal resistance of batteries, such as poor accuracy, high complexity and affecting the life of the battery, an on line detection system of internal resistance based on pulse current discharge method is studied. The pulse current is discharged to the load through controlling the MOSFET, and acquiring the voltages and current before and after discharge. The AC differential circuit amplifies these signals and then transform into DC signal. After the filter circuit processing, they are converted into the digital signals. Finally, the MSP430 microcontroller analyzes and calculates the internal resistance of the battery on line. The experimental results show that the pulse current discharge method needs to less parameters, and reduces the complexity of the system, improves the accuracy of on line measurement of battery internal resistance, at the same time avoids the damage to large transient current on the battery and prolongs the service life.