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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: Battery (SLA) modeling
Date: Fri, 13 Dec 2024 09:23:26 -0800
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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.