fabieville
100 W
- Joined
- Jul 15, 2012
- Messages
- 114
I have a huge lot of modem battery pack consisting of (3) 18650 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 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?