otrfun wrote:
StirCrazy wrote:
. . . I would argue there is more potential for something to go wring in a battle born with over 100 cells soldered in as aposed to a prismatic type with only 8 battery conections, but it will be easier to detect on the prismatic . . .
I would argue there is less potential.
The 100ah Battleborn (BB) battery cost more for a very good reason---better redundancy. BB uses 100+ cylindrical cells spot-welded in a parallel/series configuration (vs. series connected prismatic cells). Configured this way, a few cells can loose capacity or become unbalanced and have very little effect on the battery's overall output.
99% of the 100ah lifepo4 batteries on Amazon, etc., use prismatic cells. Typically 4 in series. If *any* of these 4 cells loose capacity or become unbalanced it directly and immediately degrades the overall output of the battery---potentially to the point the battery becomes almost unusable, all because of one cell.
BB could have easily chosen to use less expensive prismatic cells, but they didn't in order to provide a more stable, robust battery.
your talking about the noticable effect not the potential, and I did say that I believe. in a battle born if a solder joint comes lose it or a cell goes bad depending where it is you might not realy notice it or you may notice it a fair bit depending on the failur. in a prismatic if one goes bad you know it, which I concider a good thing and ease of changing out a cell in a prismatic system is by far more easy. I would argue also that prismatic may or may not be less expensive. the actual physical cell the celindrical cell is much cheper to produce on automated lines so to buy the cells them self the 120 cells in a 100AH battle born are cheeper than four 100AH prismatic cells untill recently.... the manufactuing process for prismatic has been altered and ramped up which is bring the cost down on prismatic quite significantly. you have less conections inside a prismatic battery so less chance for a factory defect, which also translates for lower labour costs. because you have 12 to 20 conections over 10 posts in a prismatic compared to the 240+ in a celinderical set up so the labour to wire/conect the cells is much less. the new production savings and increase in amounts of prismatic cells is making them more populer in automotive aplication which is bringing the price of automotive battery down. tesla is now doing all there chinese cars with LFP prismatic cells.
Steve
