How is battery SOC measured?

The SOC of a battery, that is, its remaining capacity, can be determined using a discharge test under controlled conditions. The voltage method converts a reading of the battery voltage to the equivalent SOC value using the known discharge curve (voltage vs. SOC) of the battery.

What is state of charge SOC and how is it measured?

The state of charge (SOC) of a cell denotes the capacity that is currently available as a function of the rated capacity. The value of the SOC varies between 0\% and 100\%. If the SOC is 100\%, then the cell is said to be fully charged, whereas a SOC of 0\% indicates that the cell is completely discharged.

Which method is more accurate for calculation of SOC?

This is defined as the percentage of the battery capacity available for discharge. Artificial Neural Network (ANN) is the most accurate and fastest method to estimate SOC because of it’s self processing factors.

How do you measure the state of charge in a lithium ion battery?

To track the state of charge when using the battery, the most intuitive method is to follow the current by integrating it during cell use. This integration directly gives the quantity of electrical charges injected or withdrawn from the battery, thus making it possible to precisely quantify the SoC of the battery.

Is terminal voltage is a measure of SoC of battery while charging?

When a battery is discharging, the battery`s current and terminal voltage must both be measured to estimate its state of charge (SOC). But when the battery is discharging, it is not possible to measure the OCV due to the voltage drop in the battery`s internal resistance (IRdrop).

What is SoC in lithium ion battery?

SoC is defined as the rate of the available capacity to its maximum capacity when a battery is completely charged, and describes the remaining percentage of battery capacity.