Heatshrink and protection for battery packs

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KernowRob
50.2% (Neutral)
Newbie Topic Starter

11 years ago

I'm building a 1s3p 18650 battery pack from unprotected sanyo cells, I'd like to protect the pack with a pcb but struggle to find a source in the uk. Will only be driving a 7135 at 1050ma but may increase to 1400ma in the future, can anyone recommend a pcb for this use or a trusted seller I can purchase them from?

Also, I'd like to heatshrink the pack when they're soldered together, but not sure which size heatshrink I should buy, so does anyone have any tips for that too?

This project has been stalled for too long and I want to get on and finish it asap or it'll never get done! :thumbsup:

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royfellows
50.2% (Neutral)
Newbie

11 years ago

If its for your own use and you dont intend buiding any to sell then dont bother with one.

If you use a good quality dedicated charger you cant overcharge and your lamp will go out before the voltage falls enough to damage the cells.

This assumes a parallel array, you cant operate 7135 chips at over 6V anyway.
Unsure what meant by 1s, you cant connect 1 in serial with itself, a bit like the Buddhist koan about the sound of one hand clapping.
:lol:

Another thought, forget heatshrink it tears. Use a waterproof container or pot them into something

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KernowRob
50.2% (Neutral)
Newbie Topic Starter

11 years ago

Thanks Roy, the lamp will be for my own use and so thats worth bearing in mind. I'm going to machine a watertight battery holder from aluminium similar to the Nora 2 battery pack, however was wanting to heatshrink the battery packs for tidiness and to reduce the chance of shorting out (even though I'll anodize the battery pack. However I didn't realise it has a tendency to tear.

I have a Xtar WPII charger, do you think that will be okay for trusting to charge my pack ok? I know it will 3 times as long to charge the cells but I'm very cautious when it comes to li-ions so don't want to take any chances. I purchased the charger due to good reviews, so fingers crossed it'll be sufficient.

Do you use protection circuits for your batteries Roy?

royfellows
50.2% (Neutral)
Newbie

11 years ago

"KernowRob" wrote:

I have a Xtar WPII charger, do you think that will be okay for trusting to charge my pack ok?

Sorry I have no experience of this charger. But it could be a good idea to try it out and check it against a meter and bounce it back to supplier if NG

"KernowRob" wrote:
Do you use protection circuits for your batteries Roy?

Absolutely, and backed up with polyfuses. If you are producing something to sell you have to assume that if its possible for someone to do something, sooner or later someone will do it.
I still had an instance of someone complaining that a battery went flat while just being left in a car. (It was connected up, think about it)

Off topic a bit but I once saw a charger that used an inductor in its PCB (which was of a type suitable for 110 ~ 24V) but the maker still took the mains input through a seperate 110V transformer.
Some people appear mistrustful of Chinese electronics for some reason :lol:

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rufenig
50.2% (Neutral)
Newbie

11 years ago

Look up
"liquid electrical tape" on the auction site.
You can dip things in this or paint on as a protective coat. :smartass:

royfellows
50.2% (Neutral)
Newbie

11 years ago

I would not trust it for underground use where there could be roof contact etc. I know of some failures where cells have been dipped in various liquid rubber type mixtures and water has got in.
Solid containers seem to rule here.

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