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From: Roger Johansson
Subject: Re: Reducing contact resistance for low volt use?
Date: Tue, 07 Jan 2003 02:22:35 +0100
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> I do understand. A person is using motors AND batteries in a manner
>that is destructive. I am supposed to help?
I just wanted to inform you that there are facts you don't know about
here. It is not as nutty as it sounds to begin with.
But close to :-)
>>These battle-robot builders regularly take out 30 A for 6 minutes from
>>3000mAh cells, and 50A for short durations, and they are trying to
>>push performance even further.
> All they need to do is put more batteries in parallel with those
>already in place. More current per pack, not more voltage.
I have a feeling they have tried different possibilities.
They obviously have a weight limitation, and thus a limitation on the
number of batteries, and the question is how to get a maximum of
performance out of these batteries during a very short time.
Under conditions very close to shortcircuiting them.
I guess they have already tried reconnecting these battery packs so
they become two series chains connected in parallell, instead of one
series chain of batteries.
I just thought about the idea to put a battery in a bath of mercury
which somebody mentioned earlier.
It would actually be possible to measure the voltage during the
discharge process by holding the battery with probes connected to a
voltmeter, isolated probe wires, only the contact points un-isolated.
The energy dissipated could be measured by monitoring the temperature
of the mercury bath. A reasonably small amount of mercury in a
container not much bigger than the battery. From the energy
dissipation and the voltage curve we could calculate the current.
If there was an Association for Prevention of Cruelty to Batteries we
would be in serious trouble :-)
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