I need to build a 10S3P battery for an E-Bike (the ESC is set to a max current of 15A which is why I went for Sanyo GA cells to get that edge in capacity). It has to fit inside a water bottle (SKS cage box) that I already bought and that other ebike builders have successfully used before. However to fit the battery inside is has to be in this configuration So 10 cells per “layer” and then three of those layers stacked on top of each other. (Please excuse the poor drawing - I am on vacation and don’t have my CAD software with me )
I know that this config is far from ideal and will be tricky - but I want to do it this way nonetheless. The question I am hoping to have answered by you guys is what the best layout would be. I could do three p groups per layer and connect them in series OR I could connect three p groups vertically in series. The second option would have the benefit that you could simply fold the entire pack into its final shape and don’t have to worry about strong insulation between the layers. The last P group will also be a pita because I have to connect three stacked individual cells in parallel - but it should be doable with some creative wiring.
Another thing someone recently pointed out: is it really better to connect the cells in series first and only then do the parallel connection? So far I have always seen people do their p-groups and then connect them in series.
Well I am looking forward to your hints and ideas. Thanks a lot already.