Understanding battery health through internal impedance

When data are acquired correctly and consistently, internal impedance is shown to be closely related to battery capacity. Although it is not a direct measure, it can be used as a valid indicator of health status (SoH) to predict remaining battery life.

A 25% increase in internal impedance signals a reduction in performance from about 100% to 80%. This level of increase, between 25% and 35%, is generally acceptable and can be managed with a standard replacement program.

Advanced degradation and end-of-life

When the internal impedance increases between 35% and 50%, the degradation of the battery's capacity becomes evident as it approaches the end of its life cycle. However, accurately estimating how much time the battery has left is a complex task.

To facilitate this assessment, someAdelsystem CBI devices use sophisticated algorithms to calculate the actual battery capacity. Through repeated charging and discharging cycles, these devices provide an accurate indication of remaining capacity, expressed in ampere-hours, taking into account factors such as changes in temperature, load current, and charge current.

Advanced monitoring with Adelsystem devices

Adelsystem's CBI devices compare actual battery capacity with user-defined nominal capacity. This data, combined with internal impedance evolution, provides a percentage state of health (acronym SoH) of the battery.

With the DPY351 connected via AdelBus, key battery parameters can be monitored in real time. This functionality enables comprehensive control and effective preventive maintenance, minimizing the risk of downtime or sudden failure.