Re: Battery (SLA) modeling

john larkin <JL@gct.com> wrote:

On Thu, 12 Dec 2024 23:57:54 -0700, Don Y
<blockedofcourse@foo.invalid> wrote:
 

At a fixed time and temperature, is it safe to model a battery as a
fixed voltage source behind a series resistance?  Possibly, additionally,
a parallel RC to cover transients?
 
In particular, does the model need to change based on whether the
battery is being charged or discharged?  (i.e., to estimate that
series resistance)

 
I've wondered about electro-chemical time lags, ions drifting around
in liquids, as in what would the Spice model of some battery be? And
on a slower time scale, the morphology of a battery changes with time.
Nearly discharged batteries sure go Hi-Z.
 
What we need here is a good physical chemistry guy.
 
 

Yes I have noticed SLA can exhibit an initial voltage sag far longer than
can be explained just by internal resistance- I assumed some kind of
stagnant electrolyte layering effect?


--
piglet