Coulomb Counting Calculation of the battery SoC

How to calculate or estimate the battery SoC by Coulomb Counting?

Answer 1

[Ameer Hamza]

Coulomb counting is basically the integral of the current w.r.t. time. So if you have current values and corresponding time values, then you can use cumtrapz()

t; % time
I; % current values

Q = cumtrapz(t, I)

[Trung Q. Nguyen]

How to estimate SoC (t) from the Panasonic 18650 battery cell?

t = 1369, SoC min = 0.3 SoC max =0.9 Max discharge current (A) = 11.25 (5C) Panasonic 18650 battery cell

Rated capacity (Ah) 2.25 Nominal voltage (V) 3.7

I try coding

t=1368; % time

I=11.25; % current values

Q = cumtrapz(t, I)

Error using cumtrapz (line 51)

Dimension argument must be a positive integer scalar within indexing range.

Error in Untitled6 (line 3)

Q = cumtrapz(t, I)

[Mustafa Ahmed]

Q=cumtrapz(ı,t)

[Gokul Gopakumar]

Hello,

I had a similar question regarding the Coulomb Counting method. I have a table of test data with a charging phase (CCCV), a rest phase (2hr) and dynamic discharge profile (WLTP) . The time is in 'hh:mm:ss.SSS' format. So how will the code change in this case?