Battery Internal Resistance Measurement using AC Impendent Method
LU Wen-yu · Journal of Chongqing Institute of Technology · 2009
This paper presents a method of the lead-acid battery internal resistance measurement based on AC impedance method.The precision resistance and the battery internal resistance constitute a series circuit,and by injecting a weak sine wave signal into the battery.After output response is processed by filtering,the peak detection,amplification,and AD convert,the battery internal resistance is calculated by the voltage ratios.To validate the proposed method,the battery resistance measurement system based on the C8051F040 MCU is designed.By taking 20Hz sinusoidal AC signal as excitation source and measuring the response signal of battery resistance and precision resistance,the battery internal resistance is calculated.The experimental results show that the proposed method can be effectively used to measure the internal resistance of lead-acid batteries,and the results of measurement are robust and effective.