DIY 18650 protection?

[Bauer]

Adding protection pcb to 18650, what wire to use?

I have a couple of the 4A protection pcb's from fasttech but they didnt come with any wires or button top. I am wanting to add these to a couple samsung 2400's.

I have kapton tape and wanted to see if copper tape (like the kind you wrap on p60's) would be good enough? Its pretty thin so i could use more than 1 layer if I need to.

Another thing is the button top for the positive contact. Any homemade options or will the tab be ok?

 

[bshanahan14rulz]

Re: Adding protection pcb to 18650, what wire to use?

copper tape might be thin enough, but make sure to use your kapton, and not rely on the adhesive layer of the copper tape to insulate it.

Button tops are only for applications that cannot work with flat tops. A blob of solder on the driver's contact pad ought to fix that issue.

 

[naazrael]

I apologize for not knowing how to read this diagram. I do have good solder technique. Can anyone help a layman understand how to use these boards? Specifically where each pad needs to go to or whether all four need to be used in a single cell configuration?

Thanks in advance,

Unenlightened


ps: I asked the supplier and they said it depends on how I want to configure it. (then I spent several hours on on the internet...nada)

http://www.trillion-sz.com/datasheets/Protection_IC/1CELL/CS213DS_Rev1_2_20100315.pdf

That should explain the box in the schematic (note, not diagram).
It shows the pinout of the chip. Now the resistor (marked R1) is likely just for current limiting purposes to protect the chip. The FETs at the bottom control the logic for either charging or discharging. The V- pin is to provide a reference to see whats happening at Vss, like to see if its overdischarging or something.

 

[degarb]

Bookmarking this thread; I spent last 20 minutes looking for instructions for adding the protection circuit to an 18650.

http://www.rchacker.com/announcements/trustfirebatteryexplosion
The above link explains to me why so many "protected" cells are exploding: they aren't protected at all. Furthermore, I own 6 of these, thinking they are protected.

Rather than throwing away my six Trustfires, I am thinking of adding the dx.com (or open to alternative suggestion) protection circuits to the cells.

I am also assuming no harm in accidentally double protecting cells.



Interesting find of an magnetic 18650 fuse:
https://www.youtube.com/watch?v=hbXug5XoG0Q#t=90 I don't see where to buy. (Though it wouldn't give over and under voltage protection.)

 

[degarb]

http://www.gotvapes.com/index.php?main_page=product_info&products_id=1091

http://thevapesafe.com ... I tad high priced for redundant protection. Ahh, some smoker will buy it.

Seems 18650s can cause lung cancer when used improperly. I never knew. I also never knew how high tech smoking is becoming. Are the kids getting bored with meth chemistry?

Some of the vendors claim it (thevapesafe fuse) has low voltage protection, which seems like bunk to me. Neither can I see it preventing over charging. Just at 7 amps, it blows.