ebike Li-ion battery pack

I have a huge lot of modem battery pack consisting of (3) 18650 Li-ion cells in each of the pack. 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. The packs comes with built in BMS (battery management system) in each of them.
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?
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.
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.
Would there be any balancing issues or any other issue(s) that may or may not arise from this method?
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 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?
Thanks in advance for the support.
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. It would be a very time consuming task.
so what do you think guys would my method work perfectly without causing any issues?
what are your recommendations and suggestions or input on this regards?
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?
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.
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.
Would there be any balancing issues or any other issue(s) that may or may not arise from this method?
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 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?
Thanks in advance for the support.
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. It would be a very time consuming task.
so what do you think guys would my method work perfectly without causing any issues?
what are your recommendations and suggestions or input on this regards?
Comments
This is a tedious process which may be possible with matched new cells, however with unknown cells perhaps of different age it would be a gamble at best. Using the individual BMS theroy wouldn't work because as soon as the first "individual battery " reaches full charge the voltage on the ballance of batteries would likely exceed the requirements causing them to shut down...... or worse
Be very careful with lithium cells some can react violently outside their required voltage parameters, be aware I'm not being negative but rather realistic. Know the exact chemistry, study their requirements before proceeding, this is something I personally wouldn't recommend but do understand the curiously, behind the question.
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
However suppose i build a large battery pack with a lot of these in parallel would i be able to pull at least 25amps constantly from them without causing any issues????
I am planning to use 130 of them to build a 48v ebike battery packs. with (13) strings of (10) cells group together in parallel with a total amounting to 48v @ 26amp.
https://www.cnet.com/news/why-are-hoverboards-exploding-and-catching-fire/
And the Escooter fires now:
https://duckduckgo.com/?q=escooter+fire&atb=v122-1__&ia=news
In general, the major cell manufactures do not sell single "bare cells" to civilians. A major factor being that placing these batteries into banks and commercial products can be dangerous if not done correctly/safely.
Not a comment against you or your skills... But this is a very complex engineering project with lots of issues.
This forum has a lot of information about Li Ion batteries:
https://www.candlepowerforums.com/vb/forumdisplay.php?9-Flashlight-Electronics-Batteries-Included
Just want you to be safe.
-Bill