In the earlier days of DIY lithium conversions, conventional wisdom was that batteries needed to be tightly strapped - even so far as using threaded rod and metal plates to compress them together. It was believed that this prevented bulging - kind of like keeping the smoke from escaping. It turns out that bulging is entirely avoidable - just don't abuse your cells with over-charging or over-discharging. However, it is convenient mechanically to group the cells together. It makes it easier to load them in the racks, too. So I got some poly strapping equipment and banded most of the cells in groups of 3, 4, or 5.
Use is pretty straightforward. Place a length of strap around the thing you want to bind, and put a metal clip in place, then thread the strap through the ratcheting strapping machine:
Tension the strap as desired (being careful not to over-tension), and then crimp the metal clip (you can also see the crimper on the work bench at the right of the picture above):
Once crimped, press the lever on the ratchet down to cut the band:
This strapping will not hold much weight, so I don't recommend it as the only battery support mechanism, but it does keep things in place nicely while assembling packs.
Use is pretty straightforward. Place a length of strap around the thing you want to bind, and put a metal clip in place, then thread the strap through the ratcheting strapping machine:
Tension the strap as desired (being careful not to over-tension), and then crimp the metal clip (you can also see the crimper on the work bench at the right of the picture above):
Once crimped, press the lever on the ratchet down to cut the band:
This strapping will not hold much weight, so I don't recommend it as the only battery support mechanism, but it does keep things in place nicely while assembling packs.
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