Passive top balancing LiFePO4 cells

I have 24 x A123 3.6 volt max, 2500 mah 26650 cells in parallel. 104 of these parallel packs in series. I need to limit max voltage to each parallel pack to 3.6 volts while charging. So I need a circuit that connects to the V+ and V- of each parallel pack. (104 of them). It will do nothing until the pack reaches a voltage over 3.6 volts. It will need to dissipate up to 16 amps. This is a battery pack for a 1997 Chevy S10E electric truck built by GM and originally designed for a lead acid pack. I have what I've described here to control 4 parallel packs. But to purchase enough to handle the entire pack will cost over $1,000.00. I was hoping to assemble my own circuits for a bit less. I don't have a lot of experience in this field but I'm willing to learn. All I need is the info to do this. I'm not asking for anyone to assemble these for me. Thanks for any help. Kevin in Delaware

by bjnkm
May 01, 2019
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