18650 pack safety

[cwah]

Dexter was my mentor

It feels that tape can be very strong when you have enough of them!!

If there are any easy way to do single cell protection I'd be happy to do, but for now only Tesla can do that!

 

[riba2233]

90% battery, 10% tape!

btw, does it makes sense to use single cell protection?
by either a round pcb or just a simple ptc fuse on each

PTC is already in side, and PCB absolutely not! That's only for single cells, not for packs.

 

[Xer0]

PTC is already in side

in any cell, even cheap chinese ones or ripped from laptop bats?

i'm just worried about a single cell could short someday and the paralleled ones will blow it up then. that 1-in-1-million case.

a self resetting fuse between each cell between the line paralleling them should make it safe enough, hm?

 

[riba2233]

PTC is already in side

in any cell, even cheap chinese ones or ripped from laptop bats?

i'm just worried about a single cell could short someday and the paralleled ones will blow it up then. that 1-in-1-million case.

a self resetting fuse between each cell between the line paralleling them should make it safe enough, hm?

It should, but why? Chances are almost zero. PTC should be inside most cells, but with cheap chinese you are never sure. And why would you use them in first place? Other brand name cells like panasonic, lg, samsung, sanyo and sony are safe even without ptc.

 

[Xer0]

but with cheap chinese you are never sure. And why would you use them in first place?

i got a big lot of "USB Powerbanks" for 1€ each, 2500mAh (tested myself) cells inside

 

[riba2233]

Forget about anything similar for EV use.

 

[Xer0]

nevermind, i will use them in my mobile speaker system. 6S8P or 12S4P. 50W draw usual, peak 100W