Subject: Re: Reducing contact resistance for low volt use?
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
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Date: Mon, 06 Jan 2003 12:44:18 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 07:44:18 EST
On Mon, 06 Jan 2003 06:20:59 GMT, jmuchow@SPAMMENOTcamlight.com (John
Muchow) Gave us:
>My need is to have 100A flow through my constant-current load from a
>1.2V or 2.4V (only measuring voltage-vs.-time for one cell though)
>source. I can't possibly see the harm in having 100A-capable
>terminations for a single or 2-cell test string of cells in case we
>get close to, or even achieve, that 100A value. Even if we don't, how
>the heck can having 100A terminations be a problem if there's 50A
>flowing through them?
Well, since the battery isn't made to deliver that at voltage, it
would seem that needing such terminations or attempting to apply or
attach them is futile, at best.
Anyway, there are spring loaded pins with sharp points made for this
purpose. You would need to place four or five in parallel at each end
of the tester "socket". They would make contact with about 8 points
on each pin, for 32 points on each end for a 4 pin array.
They are not cheap. I think there are actually larger, high current
versions out there as well. You could always have one made for you.
A silver cap, knurled, mounted on top of a copper pin. One for each
end. You could probably get it made by a jeweler. Not cheap there
either. I suppose copper would work as well.
Hell, flat contacts will work if the surface area of contact is
enough. All you would need do is keep contact pressure high. A
fixture that put five or ten pounds of pressure on the pins would
Short od that, you would have to make hard contacts on them by
soldering or spot welding. Since the caps are steel usually,
soldering would likely not even be as reliable as direct contact with