Personally, i'd look up the information first, since it's free, except for the minimal time it will take. build a pack however you feel like and then test it by riding it, potentially damaging the cells if they can't handle what you're after, and then rebuilding it bigger if it can't, spending more time and money, etc. spend more money, and more time, and buy or build testing equipment, and then do the necessary testing at different rates simply look up the cells based on the numbers you have on them (this is free) If you want ot know if they'll work, you *have* to know what the cells are capable of (or rather, what they *were* capable of when they were new). But you would have to do balancing at some point. You could also charge them as 4 separate 10.8V packs and balance that way. You could balance via the BMS but that's more work. To balance you might just remove all the packs once in a while and charge them all individually. And since you only need to monitor 3 points (really 4 with the B+ side) it would be a lot easier. A simple comparator circuit would likely suffice. For a 12S pack, for example, you'd only need to monitor 3 points. Secondly you will need a minimal BMS monitoring the inter-cell points. You'd need a 50.4V or a 63 volt charger for them.
Since you have 3s packs your final battery has to be a multiple of 3. What are your recommendations and suggestions or input on this regards?ġ2:28amMy question is, with this proposal each pack would already contain their own built in BMS, so therefore would it be possible to charge the overall pack with a 48v ebike Li-ion charger rated at 54.6v without causing any issues to each of built in BMS bearing in mind that the entire pack is made up of several smaller packs of 10.8v that are connected in series/parallel connections to get an increase in voltage and current.įirst off you can't do 54.6 volts.
So what do you think guys would my method work perfectly without causing any issues? Why i want this to work would be because it would be much easier and less time consuming to built a big battery pack with this method instead of having to scrapping out the cells out of each pack which would be a total of 84 modem packs then have to rewire them in series/parallel connections and then to add a 48v BMS to the overall pack. Would i be able to can pull large amount of current from the overall pack for example 30-35amps without any adverse effect on the cells or each of the built in BMS? Next question is if the charging is possible would each of the packs auto regulate the cells inside of them so they don't overdischarge during charging stage of the overall pack and they don't underdischarge during discharging stage when using the ebike? Would there be any balancing issues or any other issue(s) that may or may not arise from this method? My question is, with this proposal each pack would already contain their own built in BMS, so therefore would it be possible to charge the overall pack with a 48v ebike Li-ion charger rated at 54.6v without causing any issues to each of built in BMS bearing in mind that the entire pack is made up of several smaller packs of 10.8v that are connected in series/parallel connections to get an increase in voltage and current. I have a total of 84 packs so after the series/parallel connections i would end up with a total pack of 54v with an estimated 43amps overall. I am wondering if it is possible to wires these packs in series/parallel connections to be able to increase the voltage and the current rating to bring the battery to 54v for a 48v ebike with a much higher amps than what one pack would offer? The packs comes with built in BMS in each of them. Each modem battery pack is rated at 10.8v 2600mAh as each of the cells inside is rated at 3.6v, 2600mAh and they are connected in series, hence you get the 10.8v rating. I have a huge lot of modem battery pack consisting of (3) 18650 cells in each of the pack.
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