Recent content by Jonndeka

Yes. This is just an example for my understanding, but for accurate slope we need to consider a short time interval. But as you mentioned, the unit of this slop is volts/minute, but in this derivative we don't have consider time directly.

Do you think can we say: Slope of OCV = dOCV/dSOC ?

Anybody doesn't have any comment?

Thanks for your comment. well, battery supplier give me helpful information such as OCV-SOC, DCIR, cycle life and so on. And know I'm trying to understand how can I use them for SOC/SOH estimation. That's why I read papers to understand the fundamental of this task.

Hi, I'm investigating SOC-OCV for Li-ion battery for SOC estimation. I have checked a lot of papers in this matter. I got a bit confused on the U_ocv calculation part. In general, the definition of open circuit voltage is such that the battery is not connected to any load and has reached a...

We use the current transducer for sensing current. https://www.lem.com/sites/default/files/products_datasheets/dhab_s_137.pdf I would like to know coulometer is more accurate than that?

So how long is enough for a LFP cell to reach steady-state voltage? As you know for some application we don't have constant current and so that the voltage is variable. I just would like to know how many second/minutes does need the battery reach steady-state and coulometer corrects the new SOC...

My big concern is how can we identify the initial SOC while the battery didn't reach equilibrium voltage (steady-state). In this case we can not use OCV-SOC look-up table.

Thanks for your reply. So if you mean "voltage sensing" is estimate SOC through OCV-SOC look-up table for SOC correction or estimate initial SOC, this is my first question. I'm saying when the battery has not passed the relaxation time, we can not use OCV-SOC look-up table. Because battery...

In real-word application we always don't have full charge battery and in reality maybe the EV or other electric application might be charged partially. So we can not use fully charged method for SOC estimation. Right?

Actually your proposed method is suitable for constant current load or low duty application. I want to use for heavy-duty application and our discharge current is very variable.

I agree! So what's the solution?

I guess coulometer is used for accumulating Ah overtime and it's not applicable for SOC estimation for a cycle. Could you please clarify how can I use coulometer for SOC estimation? If EV is switch off and when we switch on, how coulometer can estimate the initial SOC?

Hi everyone, I got stuck in the concept of SOC estimation using Coulomb counting and SOC-OCV curve look up table. Actually, one of the main issues which arise for me is when the EV is switch on and then you switched it off. After one minute you are going to switch it on and now EV is under...

Nobody knows?