What is the method of measuring the internal resistance of lead-acid batteries

The use of measuring the ohmic resistance of lead-acid batteries to test the technical status of the battery is becoming more and more popular. The measurement of the internal resistance of the battery contains several factors, including not only the physical connection resistance, the ionic conductivity of the electrolyte, and the electrochemical process that occurs on the surface of the plate. Regarding multi-cell batteries above 6 volts. The connection between the grids will also have an additional effect on the detection value. The internal resistance of the battery can be detected by the following techniques: a. Impedance measurement can be done by applying a current signal of known frequency and amplitude to the lead-acid battery, and then measuring the AC voltage drop that occurs on a single cell or a whole group of batteries. The AC voltage is measured by the positive and negative terminals of a single battery or the smallest cell. Then use Ohm's law to calculate the resulting impedance. The calculation is done automatically by the meter. b. Conductivity can be detected by applying a voltage of known frequency and amplitude to a battery to detect the change in current flowing through the battery. Conductivity is the ratio of the AC component and the voltage amplitude in the same phase. c. Resistance measurement is to apply a load to the lead-acid battery, and then measure the voltage and current flowing through the various stages of the battery. The ohmic value is obtained by dividing the rate of change of voltage by the rate of change of current. d. Open circuit voltage method. The open circuit voltage method estimates the internal resistance of the battery by measuring the terminal voltage of the lead-acid battery. The accuracy is very poor, and even wrong conclusions can be drawn. This is because even if a battery whose capacity has become very small, its terminal voltage may still behave normally under the re-floating state. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.