The requirement is to compute the capacity of the battery in order to calculate the capacity degradation. The input which can be acquired are current, voltage, relative time, battery level (in terms of percentage). Capacity = Integral of Current over time. (of discharge cycle)
The input which can be acquired are current, voltage, relative time, battery level (in terms of percentage). Capacity = Integral of Current over time. (of discharge cycle) So the doubt is, does the time here mean from reaching, say, x voltage to y, or from battery level 100% to 0% on discharging?
The current control system is commanded by a superimposed battery voltage controller aimed at bringing the battery terminal voltage to the fully-charged state while also limiting the maximum battery charging current.
If you measure the current over a given time step you have a measure of the number of Ah that have left or been received by the battery. where: If you want to know the absolute SoC you need to know the starting SoC of the cell, SoC (t-1) as given in the equation. One option is to fully charge the cell to a known voltage.
Convert charge to capacity: Divide the total charge (in Coulombs) by 3,600 to obtain the battery capacity in ampere-hours (Ah). Let’s assume we have a battery that discharges at a constant current of 5 A for 3 hours. We want to estimate its capacity using Coulomb counting.
To estimate battery capacity using a multimeter, follow these steps: Measure the OCV using the multimeter’s voltage setting. Compare the measured voltage with the manufacturer’s voltage vs. state of charge (SOC) chart. Estimate the battery capacity by multiplying the rated capacity by the SOC percentage obtained from the chart.