ohthetrees
New Member
- Joined
- Jun 28, 2021
- Messages
- 76
I'm sure everyone is tired of talking about cell compression. I know I'm tired of reading about it (I've read many posts on many threads about it).
What I'm hoping to discuss in this thread is compression and bus bars, but only as it relates to the integrity of the terminals. I have 16 EVE 280ah from Amy on the way, and I'm coming up with my pack design, which will be a 4P4S design. My original plan was to build a threaded rod box with aluminum end plates, snug them lightly at 50% SOC, and use the bus-bars supplied by Amy (2mm x 20mm). However, all this reading about compression has got me worried about the strain on the terminals when the cells expand and contract.
What I'm asking for is 1st hand experience or informed opinions on whether the fixturing discussed above would mitigate strain on terminals with solid bus bars. Since I'm building the pack for a boat, and I'm already slightly nervous about the physical durability of these big 280ah cells, my first priority is reducing any physical strain on the cells. Improved cycle life is far down the list.
I just don't have a sense of how much force the terminals would experience (Usually charging less than 0.2C and discharging less than 0.3C) with such a setup.
At this point, I'm getting so concerned about terminal strain that I'm leaning toward interconnecting with curved pieces of wire and lugs, maybe 1/0 or 2/0. Alternatively, I'm also thinking of putting spacers between each cell (corners and edges) and letting the middles of the cells "breath" even though I'd give up cycle life, maybe this would reduce strain and I could keep the rigid bus bars.
What I'm hoping to discuss in this thread is compression and bus bars, but only as it relates to the integrity of the terminals. I have 16 EVE 280ah from Amy on the way, and I'm coming up with my pack design, which will be a 4P4S design. My original plan was to build a threaded rod box with aluminum end plates, snug them lightly at 50% SOC, and use the bus-bars supplied by Amy (2mm x 20mm). However, all this reading about compression has got me worried about the strain on the terminals when the cells expand and contract.
What I'm asking for is 1st hand experience or informed opinions on whether the fixturing discussed above would mitigate strain on terminals with solid bus bars. Since I'm building the pack for a boat, and I'm already slightly nervous about the physical durability of these big 280ah cells, my first priority is reducing any physical strain on the cells. Improved cycle life is far down the list.
I just don't have a sense of how much force the terminals would experience (Usually charging less than 0.2C and discharging less than 0.3C) with such a setup.
At this point, I'm getting so concerned about terminal strain that I'm leaning toward interconnecting with curved pieces of wire and lugs, maybe 1/0 or 2/0. Alternatively, I'm also thinking of putting spacers between each cell (corners and edges) and letting the middles of the cells "breath" even though I'd give up cycle life, maybe this would reduce strain and I could keep the rigid bus bars.