Open circuit voltage (OCV)

[dpj]

Why open circuit voltage (OCV) on a fully charged battery can be slightly higher than the nominal voltage?
Can someone explain root cause in layman language?

 

[Misterbenn]

The battery has an internal resistance so when you start drawing a current you get a voltage drop across that resistance

 

[Flyback]

The nominal voltage on a battery is also not an absolute, it can vary with level of discharge, temperature, age etc.

 

[tvtech]

Now you see Flyback, you contributed something.

Well done
People get tired of questions all the time though

+1 for sticking your neck out and giving a little.

Not that hard was it?

Regards,
tvtech

 

[Flyback]

ok here is some more..
The "fully charged" voltage on a battery can often be considerably above the nominal voltage..........the "nominal voltage" is likely to be the voltage of the "plateau" that is seen in the discharge curve when it is discharging at some rate like 0.2C.
If a battery is fully charged and in a charger which is managing it, then that battery voltage will often be rather higher than nominal....even when it initially starts discharging.
Many batteries such as lithiums, have charge protection circuits in them, so you get a small amount of voltage drop across those components also, .. when the battery starts discharging that is.
If a lithium battery goes below a certain voltage, it is ruined and shouldn't ever be used again.

in laymans terms, pretend you are an electric current (or rather a bit of electric charge) resting in a battery......then you get up and start walking through the wires connected to the battery because somebody has made a circuit up..........the energy that you take walking through the swamp of the internal resistance will tire you, and you will be less spritely when you have got through the internal resistance............but this is wrong because as long as the current flows it is always going through the internal resistance of the battery, so its difficult to bring a layman analogy.

 

[tvtech]

^^^^Where the heck have you been hiding Flyback??

At last I have managed to get you to post rather than ask questions

You are going to get shot down but if you come to the party we will bust our buts here to help you. You are not exactly Stupid.

I just think you were too afraid to talk. Hence all the questions you always ASKED here.

Always curious questions....

It's a start. I think I got you out of your Shell

And a very warm welcome to the real ETO. Where give and take is a part of life.

Regards,
tvtech