parajared
10 kW
I combined my lipos into 20 ah 6s packs and I was loading them onto my bike and I managed to drop one. Two of the four batteries in the pack were damaged.
parajared has a lipo fire
- Thread starter parajared
- Start date
tape.. not enough....
did it ignite right away ? or did it take a bit of time ?
solid materials.. like pvc.. shown above.. under compression with filament tape.. will take a drop from bench and keep on ticking.
did it ignite right away ? or did it take a bit of time ?
solid materials.. like pvc.. shown above.. under compression with filament tape.. will take a drop from bench and keep on ticking.
parajared
10 kW
It took a minute. I freaked at first, then I was like phew, loaded the thing onto the bike, an was about ready to hit the road when it started smoking, then it was a mad scramble to get the thing unloaded before my entire bike went up in flames.
done that twice, both times were pre-packaged packs, single 6S bricks, dropped from about 4ft, fully charged, mad dash for the side door and waited... but nothing... put them in the back yard stainless steel bunker and after months of sitting, the dented cells went to 0v, but no smoke no fire.
did you get fire ? . .. or just a whole lot of smoke ?
did you get fire ? . .. or just a whole lot of smoke ?
MattyCiii
100 kW
Daaaaaaaaam, I can't count how often I've dropped my soft side LiPo packs, and never a problem. Better stop doing that huh.
Trackman417
10 kW
Dropped my zippy packs off about a 3 foot table onto some asphalt. Freaked out but nothing happened. Those cells got out of balance pretty frequently until after one specific ride they just went terribly out of balance. Retired them then and there.
dogman dan
1 PW
I had some dropped packs in my stash, working fine for a few more cycles, but always waiting for the flames because they stank. In my case, the drop was just enough to rupture the foil, letting out solvent. But not a crush sufficient to short the pack.
Clearly your's shorted internally, which will generally go off.
I keep saying and saying, as do others. Wrap that shit in something. My choice has been the coroplast political signs. There is some cushioning yoga mat in the bottom of that box too.
My new pack I just bought.
Clearly your's shorted internally, which will generally go off.
I keep saying and saying, as do others. Wrap that shit in something. My choice has been the coroplast political signs. There is some cushioning yoga mat in the bottom of that box too.
My new pack I just bought.
dogman dan
1 PW
Makes me start thinking about making two boxes, one for each 5 ah section. With a metal plate between each section. Once the tape melts, poke with a stick to save half of it.
ALWAYS able to easily get it off the bike.
ALWAYS able to easily get it off the bike.
torker
100 kW
Speaking of damaged packs. Hope this isn't too off topic. Where do you all dispose of old puffed packs? Interstate battery maybe?
I have 3 that are really puffed. Only one is totally dead . The others actually have decent voltage but I don't want to store them in a metal bucket forever
I have 3 that are really puffed. Only one is totally dead . The others actually have decent voltage but I don't want to store them in a metal bucket forever
Buy a 24V tail-light from an auto parts store (cheap), and solder leads with alligator clips to the neg/pos...use that to discharge 6S packs (or any lower voltage). When they are completely dead, they are safe to take to a recycler.
http://www.topbulb.com/find/Product_Description.asp_Q_promoid_E_118_A_intProductID_E_42509?gclid=CIDwsa7FsbcCFUxp7AodYWwAfQ
http://www.topbulb.com/find/Product_Description.asp_Q_promoid_E_118_A_intProductID_E_42509?gclid=CIDwsa7FsbcCFUxp7AodYWwAfQ
MadRhino
100 GW
If you want to duct tape them, at least should you use a rigid board around before taping them together.
One layer of "No Parking" road sign makes them crash proof
One layer of "No Parking" road sign makes them crash proof
etriker
100 kW
The way they are shipped in the mail....... big boxes of them too ?
http://endless-sphere.com/forums/viewtopic.php?f=14&t=50178&start=25#p744620
We are going to blow up a mail truck with our lipo shenanigans ?
http://endless-sphere.com/forums/viewtopic.php?f=14&t=50178&start=25#p744620
We are going to blow up a mail truck with our lipo shenanigans ?
bowlofsalad
100 kW
Maybe batteries should be kept wrapped in foam at all times or something similar, I am not saying I've practiced this, but I am pretty much a newbie in the ebike world and have yet to drop a battery pack myself.
My personal opinion, that coroplast stuff is not rigid enough, hard plastic/lexan/pvc/g10/etc.. i even put double sided tape between each pack and the plastic deviders, then filament tape.. then electrical tape ...
When i dropped mine they fell on the bottom corner, and that was just one pack, if there was the weight of 3 more behind it i'm sure it would have ignited..
When i dropped mine they fell on the bottom corner, and that was just one pack, if there was the weight of 3 more behind it i'm sure it would have ignited..
dogman dan
1 PW
Yep, that's why the coroplast gets put in the metal box on the bike.
No, a big drop is still going to rupture the foil and cause problems. The box on the bike won't help if you fumble it carrying it to a charger or storage bunker. Reminds me, I need to finish the job. Usually I add a strap handle to the coroplast box so you don't fumble it so easy.
If it lands on the corner, it will have to be in a very rigid container. But the coroplast is at least going to help a lot more than duct tape. Easy to see why that failed. I have dropped some coroplast packs with no damage. But more of a flat on the side landing.
99% of the function of the coroplast, is to prevent chafing on a bag or box that you are carrying it in. But it helps some in a drop too.
Bottom line though, duct tape don't cut it.
No, a big drop is still going to rupture the foil and cause problems. The box on the bike won't help if you fumble it carrying it to a charger or storage bunker. Reminds me, I need to finish the job. Usually I add a strap handle to the coroplast box so you don't fumble it so easy.
If it lands on the corner, it will have to be in a very rigid container. But the coroplast is at least going to help a lot more than duct tape. Easy to see why that failed. I have dropped some coroplast packs with no damage. But more of a flat on the side landing.
99% of the function of the coroplast, is to prevent chafing on a bag or box that you are carrying it in. But it helps some in a drop too.
Bottom line though, duct tape don't cut it.
Chalo
100 TW
I think it's telling that no commercial outfit is repackaging these things with good physical protection and comprehensive BMS. They're not even safe enough for someone to try to make a business of that.
Is it just hokey Chinese low-budget quality control, or is it intrinsic to the chemistry that these things are so treacherous?
Is it just hokey Chinese low-budget quality control, or is it intrinsic to the chemistry that these things are so treacherous?
they are made for RC toys, and competition where every gram counts and performance is the ultimate goal... HK lipo is the low cost option that most of us opt for but we are a small niche of diy crazy people so there are no production line ebike high C rate packs marketable to the general public.
The average ebiker does not need 100's of amps or care about a few extra grams... we are the 1%
The average ebiker does not need 100's of amps or care about a few extra grams... we are the 1%
SamTexas
1 MW
That had better be rhetorical. The chemistry (lithium cobalt) is being used in billion (not a typo) cells yearly. Laptops, cell phones, GPSes, Ipods, Ipads.... Practically all consumer lithium batteries.
Quality control is not good.
The gram cutting is also something done by design - many safety features are not installed in the batteries, which would be found in commercial batteries due to liability..
That's how you get 150whr/kg and such high power output.
The gram cutting is also something done by design - many safety features are not installed in the batteries, which would be found in commercial batteries due to liability..
That's how you get 150whr/kg and such high power output.
dogman dan
1 PW
Good idea.
And uh, WE KNOW these batteries can catch fire. And frankly my dear, we don't give a damn. 1% ers. We just do what we can to use this stuff safe.
And uh, WE KNOW these batteries can catch fire. And frankly my dear, we don't give a damn. 1% ers. We just do what we can to use this stuff safe.
docnjoj
1 GW
Just don't fall over backwards! a front baby carrier might be safer? Carbon can shard and is conductive. Just sayin'Joppo said:
otherDoc
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