BIG BLAST PLASMA SHORT with LIthium Battery firework style!!

[Doctorbass]

Updated avatar:

!!!!!!!!! :lol: :lol: :lol:

Doc

 

[fechter]

Where's the video camera when you need it? I want to see that one on Utube.

I hit a grounded conduit box while stripping a live 277vac wire one time. A measley 30 amps or so doesn't weld nearly as good as your battery pack. It did turn the 14ga strip hole into an 8ga. This has been handy.

 

[Will]

Makes one a believer in Lithium batteries.

 

[powermed]

I shorted 48v 105AH batteries on my electric boat early on and promptly created a large and permanent, stainless steel nut/washer and bolt assembly. Made me a bit more cautious and respectful. Good news is that unless you do your soldering in a "sweatshop" are incredibly nearsighted and don't bother to use glasses, or hold the terminals with a clamp afixed to your chest (I really don't want to know any of those details) the greatest risk is tissue (and equipment) damage.

Low Voltage Electrocution -

http://bme.ccny.cuny.edu/faculty/mbikson/BiksonMSafeVoltageReview.pdf

Peng and Shikui (1995) reviewed cases of
low-voltage electrocutions in China. Though they
state that it is ‘relatively rare to be electrocuted by
voltages lower than 100 V”, specific statistics or the
methods by which they identified cases were not
presented. Peng and Shikui (1995) presented 7 cases
of electrocution by AC or DC voltages ranging from
25-85 Volts. In all cases, the contact site was on or
near the chest, the contact time was “long”, and skin
burns were observed. In addition the authors note
that all victims were working in an enclosed, high
humidity and high temperature environment

 

[D-Man]

A long time ago, with only a 12 volt lead acid car battery, I welded a 1/2" drive ratchet to an engine block when I forgot to disconnect the battery cable and it shorted out in between the starter motor and engine block. Lots of smoke coming from the battery cables. I did eventually disconnect the cable but it was quite a spark show.

 

[andys]

I know someone who was building a monster 200 volt 100AH LIFEPO4 pack for an electric bus, and a wrench was dropped on the thing when it was nearly all hooked together and shorted it out. The wrench was immediately vaporized, and anyone who was nearby ended up with a nice sunburn.

 

[monster]

i was working on a hybrid electric car with 48v 22ah lead cells and the manufacturer had fixed the negative terminal of the battery to the vehicle frame.
-when i discovered this it was quite a shock

big white light! and i had to grab the connecting cable away from the frame to stop it happening. it melted through a current shunt i was trying to install.

 

[TylerDurden]

My XGF called me "plasma-shorts"... 8)

 

[docnjoj]

Alright, I got insomnia again! Whats an XFG?
otherDoc

 

[ngocthach1130]

XGF - Ex Girl Friend.

Yeah when i opened my Dewalt battery to solder wires onto the tab i accidentally drop a the wires with an uncover powerpole contact which short the 2 poles. Damn 45A contact vaporize instantly and turned to burning blue metal blog and then dripped on my carpet.

 

[powermed]

those are all excellent descriptions of what high amp DC does to metal. Pretty much the same thing happens to flesh - it pretty much vaporizes. That fellow disassembling tool battery packs in the video might want to reconsider wearing the wrist watch when he works. I take off my wedding ring.

 

[Doctorbass]

those are all excellent descriptions of what high amp DC does to metal. Pretty much the same thing happens to flesh - it pretty much vaporizes. That fellow disassembling tool battery packs in the video might want to reconsider wearing the wrist watch when he works. I take off my wedding ring.

I didn't noticed that i forgot to remove my watch... :? Usually, i never forget that :lol: .. Thanks for the warn Powermed :wink:



Again, this weekend, i MELTED a dean 45A RC male connector with 75V 23Ah 10C.. the two lead vaporized.. and the smoke and black spot remembered me when i weld with electric euippment...... same thing !! that was between the fuse wire and the battery connector and the negative wire... :x

Doc

Doc

 

[Doctorbass]

My XGF called me "plasma-shorts"... 8)

Do you ever heard about a "PLASMA BOY" ?

I think he is a guy in the EVdrag racing with a white car...having the world record on quater mile...

Doc

 

[TylerDurden]

Do you ever heard about a "PLASMA BOY" ?

Ja... "white zombie" IIRC. :wink:

You might consider a check-list before operations: they work for pilots and surgeons... usually.

 

[docnjoj]

U really kinda want the checklist after operations! Saves losing those sponges and clamps!
otherDoc

 

[zenon]

Hi Doc! I'm glad your ok

I have great respect on this kinion cells the amount of energy they can output in a instant discharge like short is a humbling experience.
I was building a battery pack from this cell 15s4p for my 409 brushed setup.
I dont have a dremell to cut the tabs apart so i became creative and used a aircrafttinsnip to get cells apart ( being careful not to short the cell ).
Some how I was able to short the positive tab through the plastic cover with the tinsnip.
Hear a sizzling sound and a smoke from one cell ! Scary sense it reminded me of my ebike wire catching on fire and shooting blue flames which is jaw dropping experience to my self and the near by motorists.


Again I'm glad your ok and hello to all in this forum ( I am new)