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IBM - fuel cell battery
Posted: Tue Apr 12, 2005 11:18 am
by ibmuser
Posted: Tue Apr 12, 2005 7:08 pm
by eigh
sweet, but im still waiting for the day that more batteries are standardized. although that wont happen because every dam company and its cousin can make more money with each different type of battery they produce.
cool idea, but i wonder if its more volitile and dangerous than a regular lithium ion (which can explode if you over discharge it and cause it to operate at a lower voltage than its designed to).
Re: IBM - fuel cell battery
Posted: Sun Apr 17, 2005 1:14 pm
by beerak
Yeeeah and every day you would go to the gas station, 10 gallons to my car and 1 gallon to my laptop please ...
Posted: Mon Apr 18, 2005 12:42 pm
by Batuta
...
Posted: Mon Apr 18, 2005 2:40 pm
by eigh
Batuta wrote:eight:
dangerous than a regular lithium ion (which can explode if you over discharge it and cause it to operate at a lower voltage than its designed to).
???
LiIo batteries exploding from over-discharge?
First I ever heard of.
That over
charging can cause them to go "boom" I knew, but over-discharge, too????
yes its called under volting or something. when taht occurs an internal short happens and the battery heats up quickly due to large ammounts of electricity flowing with little resistance. chemicals heat up and become volitile.
Posted: Mon Apr 18, 2005 3:26 pm
by beerak
Lithium is sensitive to higher temperatures. Every li-ion battery is in fact "battery pack" with mechanisms against short circuits and over-charging. If these components are missing or if li-ion battery is left in the environment with high temperatures (car e.g.) temperature can go over the critical value and lithium starts vaporizing. Slacked gas will cause explosion.
If you discharge it under the critical value (+/- less then 1% of capacity - I mean real capacity, not the one showed in the battery maximizer) you will not be able to charge it again, but it will not explode, no worries. It just decreases the capacity.
dangerous than a regular lithium ion (which can explode if you over discharge it and cause it to operate at a lower voltage than its designed to).
I've never heard about it, it seems to be a wrong and misleading information.
Posted: Tue Apr 19, 2005 12:51 am
by eigh
beerak wrote:
I've never heard about it, it seems to be a wrong and misleading information.
well i guess the u of m solar car team is full of a bunch of retards then:
http://www.engin.umich.edu/solarcar/
(even though i base what i know off of hearsay from a fellow team member, i have a hard time doubting this senior electrical engineer)
but i have no proof other than that, so ok, im full of fish n chips, and not the right answer.[/url]
Posted: Tue Apr 19, 2005 11:10 am
by Batuta
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Posted: Tue Apr 19, 2005 12:31 pm
by eigh
Batuta wrote:beerak:
eigh, I followed that web link of yours, but could not find anything regarding exploding LiIo batteries.
yes i know there was nothing on their site about the batteries, i was talking to one of the engineers in charge of the electrical engineering team (just thought id post the site in case anyone was interested).
oh and have you ever shorted a battery? a regular 9 volt, hell even a AA (1.5) volt will heat up if you short the + and - sides. other than that i have no proof of liio's being volitile.
Posted: Tue Apr 19, 2005 1:16 pm
by Batuta
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Posted: Tue Apr 19, 2005 2:44 pm
by eigh
doh, forgot 9 volts are li ions. ok you win hook line and sinker.
Posted: Wed Apr 20, 2005 12:59 pm
by beerak
eigh wrote:doh, forgot 9 volts are li ions. ok you win hook line and sinker.
No, 9V batteries are NiMH or NiCd.
Posted: Wed Apr 20, 2005 1:46 pm
by Batuta
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Posted: Wed Apr 20, 2005 2:19 pm
by beerak
Batuta wrote:
They can be charged up again, but only for 3-5 times before they totally expire.
Do not try that ... they should explode during this process.