One can mention the IEC 61960 standard or PNGV (Partnership for a New Generation of Vehicles) procedure for example. Measurement methods for the internal resistance of batteries can be divided up into two categories: DC (Direct Current) techniques and AC (Alternating Current) techniques.
Batteries show capacitive, ohmic, and inductive behavior. Therefore, internal resistance cannot be approximated by Ohm’s law and its determination become much more complicated. This article gives some key methods for the determination of the internal resistance of batteries.
A detailed definition of internal resistance is available in the first part of this series of articles. Batteries show capacitive, ohmic, and inductive behavior. Therefore, internal resistance cannot be approximated by Ohm’s law and its determination become much more complicated.
Over the past 30 years, internal resistance testing has become the standard for monitoring the characteristics of VRLA battery performance. Changes hidden within the batteries’ opaque case material can be identified by their corresponding affect on the internal resistance of a cell.
Changes hidden within the batteries’ opaque case material can be identified by their corresponding affect on the internal resistance of a cell. As battery cells age and deteriorate, the internal resistance values in the cells increase, indicating a departure from healthy battery readings.
According to IEC61960, t he DC resistance can be measured as follows: A DC current step is applied to measure the change in the cell’s voltage. Battery resistance is defined as the change in voltage over the change in current when a discharge current of 0.2C is applied for 10s followed by a discharge current of 1C for 1s.