Two things i noticed in a recent 7S36P build, with the common garden black cell spacers from ebay.
1. Using Panasonic cells with std green wrapping, theres a bunch of wiggle when the cell is fitted to the cell spacer. For stationary applications, this isnt an issue but the build was for a motorhome house pack, and the movement will put stress on both the welds and the cell level fuses. Ok i could have added some glue between the cell and spacer, but that seemed kind of drastic. I will probably run a bead of glue or mastic along the top surfaces of the cells. Any other ideas?
2. They seem to made of ABS or similar brittle, low melting point plastic. I was a bit surprised at how easily they break, and also melt. Are we doing ourselves any favors using this stuff just cause it was cheap on ebay? For the strength, my advice is dont go relying on the cell spacers, use a flat surface and plenty of additional mechanical support. For the heat issue, i guess hot cells are a big enough problem to address directly, but the cascade failure that could occur if one cell overheats and vents, melting the surrounding insulation, causing more to short, and overheat, might be worth adding some kind of additional insulation between the cells.
1. Using Panasonic cells with std green wrapping, theres a bunch of wiggle when the cell is fitted to the cell spacer. For stationary applications, this isnt an issue but the build was for a motorhome house pack, and the movement will put stress on both the welds and the cell level fuses. Ok i could have added some glue between the cell and spacer, but that seemed kind of drastic. I will probably run a bead of glue or mastic along the top surfaces of the cells. Any other ideas?
2. They seem to made of ABS or similar brittle, low melting point plastic. I was a bit surprised at how easily they break, and also melt. Are we doing ourselves any favors using this stuff just cause it was cheap on ebay? For the strength, my advice is dont go relying on the cell spacers, use a flat surface and plenty of additional mechanical support. For the heat issue, i guess hot cells are a big enough problem to address directly, but the cascade failure that could occur if one cell overheats and vents, melting the surrounding insulation, causing more to short, and overheat, might be worth adding some kind of additional insulation between the cells.