is there a clear winner best practice type thing when it comes to connecting the balance leads to a brick pack?
I am leaning towards an ugly bastardized version of what Skyart did here.
soldering the leads to the nickel between the phases.
what is up with doing separate little tabs?
do those just get welded to the main nickel?
I like how kind of out of the way they are.
What enclosure are you using? Pictures?
junction box.
room on top for the smart BMS.
where I plan on putting it.
room on the sides âŚ
no room on the endsâŚ
Could go side and use the tab method.
Are you using precut nickle? If not, cut your parallel strips a tad longer to fold over to the side for balance wires.
this is a neat idea.
Where are your fishpaper rings on the positive side?
They werenât put on. This was a personal battery that was rushed to be built in time for a trip. Itâs been pulled from the build as I got better quality cells for a new battery for it.
Next, not a jab but arenât the slots supposed to align with the terminals?
So originally it was ladder style but it was intended for cells that were in holders. So I cut the center out and made strips. Again, rushed build so used what I had @ the time. Its since been put in another personal build and still running strong. Has close to 1000km and havent had to maintenance anything on it.
Disclaimer, I dont advice building in that manner unless you understand the risk. Always always always abide by battery building standards.
@Battery_Mooch perhaps you could weigh in?
Thatâs the red flag. Take extra precaution with said cells. Just dont build with them.
Could possibly be slag from a blow through.
The odd part about this is that itâs only apparent when you open up the shrink, which leads me to believe (and hope) maybe it was some cleaning agent that left the smell, and just never left once it was shrink wrapped.
On another note, they also havenât changed voltage really for the couple of months theyâve been sitting around (still 3.70-3.71). Though ik this doesnât automatically mean itâs safe, as theyâll still âwearâ just from sitting around.
like from a spot weld?
Yes. Happens when you dont put enough pressure to make cell top and nickle touch before welding.
Are you in unwrapping said damaged cells or all of them? Getting @, take the wrap off some that show no issues and see if you get the same smell.
But unless they replace the center caps (is that even possible), those havent been welded to from the looks.
Same smell off ones without that little metal nub. Though oddly enough the smell is gone from the time I posted the pictures until now. Maybe itâs the shrink wrap causing it? Or whatever is causing the smell just dissipated?
And yeah, I donât believe these should have been welded yet.
Pics from a cell without the metal nub on it
Thereâs also some gunk in that little crevice that I scooped out with using a toothpick. I think this one was a little dirty?
I am looking for recommendation on shrink wrap for 18650
When you rewrap cells, is there a good kind of shrink wrap to buy?
I can link what I use if I can find the link.
Found it
