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Article #15892Re: How full is a nicad
From: Henry Spencer
Date: Sun, 20 Dec 1992 03:17
Date: Sun, 20 Dec 1992 03:17
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In article <1992Dec19.230112.8340@klic.rain.com> keithl@klic.rain.com (Keith Lofstrom) writes:
>>The output-voltage curve of a NiCd is essentially flat from pretty nearly
>>full charge to pretty nearly empty.
>
>There are many applications where knowing the charge on the battery is
>crucial. Given my rudimentary knowledge of electrochemistry, it would
>seem that one could provide a third electrode on a battery, of some other
>materials than the main electrodes, designed to indicate the balance of
>electrolytes in the cell...
If you're willing to tinker with the battery design, then you can get a
binary version of this easily enough: both the temperature and the
internal pressure of a NiCd rise sharply when overcharging begins.
Premium-market NiCd systems often use cells with temperature or pressure
sensors built in.
--
"God willing... we shall return." | Henry Spencer @ U of Toronto Zoology
-Gene Cernan, the Moon, Dec 1972 | henry@zoo.toronto.edu utzoo!henry
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!utzoo!henry From: henry@zoo.toronto.edu (Henry Spencer) Subject: Re: How full is a nicad Message-ID: <BzJFsH.4G4@zoo.toronto.edu> Date: Sun, 20 Dec 1992 03:17:03 GMT References: <1992Dec15.103954.6299@quando.quantum.de> <BzD705.C94@zoo.toronto.edu> <1992Dec19.230112.8340@klic.rain.com> Organization: U of Toronto Zoology Lines: 18