Oh a vacation project? Well then we must proceed with all post haste and forget about planning and careful battery construction. I do not mean to be critical here but lithium ion cells of any kind are dangerous to a certain degree. Similar to having a 5 gallon gas can in your shed. With proper care and caution the fuel will never cause an issue but step beyond the bounds of safety, who knows what can happen. Well I do, seen it, not pretty.
So if this is a speed race to get a 14s XXp battery up and running be my guest, but I persuade you to step back and really thing about the design, future expansion possibilities, and above all safety. It took me almost 2 years to build my first battery, from finding cells, testing, and construction to finally putting it into production. OK enough of that.
Since you are using fuse level sheets I suppose you can get away with 2 bus runs as the nickel cover sheet is a reasonably good conductor.
If you are going 6 wide (I assume you haven't ordered the holders yet) then I would run this type of bus. But that's just me. I believe in give electrons the least amount of resistance to cry about and they will treat you right. True story I've seen them cry they emit Pions (
π) and cause heat.
Anyway.
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Can you get away with this design? I believe so
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There I have my way of doing it which is remove as much of the strip as possible clean the weld stalagmites or is it stalactites as much as possible. Don't want to make the electrons cry because of resistance. Also if you are soldering sometimes it is easier to solder to the nickel strip rather than straight to the battery. I personally never had a problem soldering directly to the battery. Proper technique, proper solder, proper heat, and no issue. Just takes a bit of practice "and" the right equipment. I personally don't solder as I do use the nickel sheets but if I didn't have them I would not be opposed to it. OK back to technique. Just before spot welding, with the cells in their holders I inspect each pos and neg side with a magnifying glass and make one last verification of the cells physical condition. If any strip residue is visible I try removing it as best as possible with flush cutters. I do not dremel of sand as it may take off the thin coating to protect the terminals from rusting or corroding. The final touch before spot welding, is, I take a heavy rounded steel ( In my case scissor handles (yea I still have really good scissors with steel handles not plastic junk ) ) and run them across the terminals on all the cells as they are in the holders in a medium pressure rubbing motion that rounds off the stalagmites or is it stalactites. It helps a lot with spot welding. I also do 2 welds per connection so I have 4 spot welds on each connection. Again maybe overkill but thats me. Spot Welding is the way to go as it introduces the least amount if any heat into the cell.
Wolf
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