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Old Mar 21, 2006, 09:48 AM
Fly by grace
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Joined Aug 2004
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Designing a lipo storge and charging station.

I am getting a few more lipo packs for my eflight experience. Given the recent lipo fire reported on this forum, I wanted to increase my lipo saftey measure.

Charging
======

Most lipo accident happeded during charging. Parallel charging is currently the saftest way.

There are balancers and parallel charge on the market. I will employ a Common sense Balancing chrager (4 single cell parallel charging) to charge all my packs.

I aslo ordered a Astro Blinky for my Hobbico Field Charger MkII as a backup charger.

Charging will carried out in my basement inside a shower reeom with cemermic floor. Currenlt charging is done insode a metal Brinks box. This is about to change.

Storage
======

Although lipo are not known to ignite itself, but after a accident, the packs may developed a minor short which may leads to accident. I wanted to keep the packs in s flame prove conatiner while extra emmission of heat and smoke are directed upward.

Brinks box and other metal container are good but when the somke preasure build up the emssion are in all direction. If the relative space of the container is too smakk for the emitted gas, than the stream of hot gas is quite dangerous. One should direct these streams in a safer way.

Preventive measure is indeed the most effective way for this subject matter. However, it is storage, especually while I am on a week long out of town vacation, that concerns me.

To design or source an approate conatin is not easy. Many foum emebers has contribut to this suject. Basic concept gathered are:

1. A container that would not burn: brinks, stoneware, flower pot.

2. Big enough space to disspate energy and pressure.

3. Direct circulate smoke/flame inward; if volume of smoke built-up bigger than container's volume, direct emmission upward via 'big' open-vent. The escape must be very open, or the preasure will built-up and 'pop' somehting open -- as shown in tests.

4. Block emitting debris: locked cover, weighted cover.

Workable design includes Brinks box with drywall and fiber glass wrap. Stoneware Battery-bunker-jar thing fits these design goal too. just a bit too small. I am considering making some bigger one with a potter's help.


Here is my draft so far. Let's see how this turns out.
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