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Old Sep 28, 2003, 10:42 PM
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Can Triton temp. sensor prevent Lipo fires??

I'm considering getting a couple of the new 2 cell Kokam 1500 Lipo batteries but am considered about everything I've heard about Lipo fires.

Does the Triton temperature sensor help prevent fires, or could a fire start before the outside of the pack gets too hot??? The sensor is supposed to shut off the charger if the sensor determines the battery is too hot.

Any other tips for fire prevention?

Thanks, Doug
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Old Sep 29, 2003, 03:25 AM
CheapBatteryPacks.com
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I think that is a great question and suprised there is no response.

Surely someone that did some extreme testing would have an opinion on this.

It would seem to me that problems caused by over charging would first result in heat in the cell. but I do not know this first hand.

if that heat, as you suspect, is higher then the cutoff limit then the triton would shut off.

Lets hope we get some more info on this as I am also very interested in knowing. well worth the $15-$20.00 for the probe if it would.

Mike
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Old Sep 29, 2003, 07:46 AM
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Mike, maybe nobody knows. Personally, I wouldn't rely on "automatic" temp. sensing and charger cutoff.

When I used a MAHA Plus charger some months ago, the temp. sensor did not cut off even though some NiMH cells I was charging got too hot, IMO. I can't say how sensitive the Triton's sensor is - I've never used it.

There have been reports of apparently cool LiPo packs "puffing".

So far as I know, there haven't been any reports of apparently cool packs catching fire.

- RD
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Old Sep 29, 2003, 08:00 AM
St Charles Flyer
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I could imagine that if the failure mode of the Lipo cells is that they "puff" prior to catching on fire then the temperature probe may never see a hot cell. The gas inside the puffed cell would tend to insulate the outside of the cell.

Does the cell heat prior to "puffing"??? Does anyone know enough about these failure modes?

STL
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Old Sep 29, 2003, 08:05 AM
St Charles Flyer
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Joined Sep 2002
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Added Thought

Do the Lipo cells puff before catching fire?

If so, then maybe a fixture that included a microswitch to cutoff charging if the cell expanded would be a means of increasing safety. This could be rather inexpensive to add to existing chargers.

STL
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Old Sep 29, 2003, 11:10 AM
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Guys, I have been thinking along the same lines, and we need to urge the designers to come up with a solution...

The cells definately warm up during overcharge, then they puff, then they get hotter, then they burst and flame... I know I have overcharged one, and caught it just as it "puffed"... It was about 120F at that point.

So I envision a casing that the cells are placed into either at MFG, or Post-MFG by a value-added reseller.

The casing (I have no idea what material) would have thermal AND pressure-sensitive circuitry that could cut the charge voltage to the cells... This would not be the "normal" cut-off for charging, but a circuit-breaker system...

I imaging the charging would have to take place "through" this casing-circuitry.

I wish I was an engineer, I would set to work on it.

Thanks, Dan
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Old Sep 30, 2003, 12:01 AM
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Ive tested the temp probe on the triton. even sometimes by accident when i set the cut off temp 10 degrees above ambient in my house to find the charger shut off on me the next day charging outdoors. the temp probe works, and i believe it will keep a lipo from exploding, However, i still wouldnt leave the charger unattended while charging......ever


Dylan
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Old Sep 30, 2003, 01:07 AM
DNA
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http://www.rcgroups.com/forums/showt...402#post806402
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Old Mar 04, 2014, 01:41 PM
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The potential problem with Lipos is that they can get hot between the inner cells, and still be just a bit warm on the outside.
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Old Mar 04, 2014, 02:19 PM
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Did not notice it was a 10 year old thread....
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Old Mar 04, 2014, 02:20 PM
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Bumping a 10+ year old thread might be a record!

I rather suspect that the OP has long moved on from his Triton by now...
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Old Mar 04, 2014, 02:21 PM
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Quote:
Originally Posted by mrforsyth View Post
Bumping a 10+ year old thread might be a record!
Yep, you'd think I'd learn to look at more than the last post date especially when the subject matter is that old..... lol
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Old Jun 23, 2014, 01:57 AM
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It's not so much the age of the post, or the mfr of the charger. It has more to do with the usefulness of a temperature sensor. I have a couple of sensors, and due to reasonable charging currents, have never had them show anything significant. Use with NiCads and NMIH batteries can be a totally different story.
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Old Jun 23, 2014, 08:14 AM
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A thickness change trigger wold be much more effective. Lipos do expand slightly on charging but nothing in comparison to the expansion when they are being overcharged.
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