HELP FINDING SUITABLE BMS (BBS02)

Jazzman56

100 mW
Joined
Sep 6, 2014
Messages
38
Location
Australia, NSW
Hi Guys,

I need some help finding a suitable 13-14s BMS with a 20a continuos and a 30a peak discharge (for a BBS02 kit with a LG Li-ion battery) and around a 5a charge rating. [strike]I would preferable like to be able to only charge each cell to 4.05v to extend the life of the pack[/strike]. Budget is up to $50 Australian (slightly more if i can justify it)

I'm looking at either :

Smart BMS (although only 13s)
https://bmsbattery.com/bmspcm/330-smart-bms-513-cells-in-series-bms-pcm.html#/discharge_current-20_40a
--> i will use a homemade programmer if i go this route.

or

Greentime bms (current rating is too high can i remove fet's to adjust this ??)
http://www.aliexpress.com/store/product/14S-lithium-battery-protection-board-48v-lithium-battery-pack-BMS-30A-continuous-60A-peak-Discharge/313864_1741119929.html

or

Bestech Power BMS (Minimum order requirement is two though :/ )
http://www.bestechpower.com/518v14spcmbmspcbforli-ionli-polymerbatterypack/PCB-D132.html
-->with a 25a working at 35a peak discharge and 9a charge current


Has anyone had problems with the above BMS's ?
Can someone point me in the right direction please for what would be most suitable (or a BMS that i might have missed) please ....?


Regards,
Jazzman
 
i cannot imagine you will find a BMS with a balancing voltage so low it leaves 10% of the capacity unused. your assumption that low voltage charging will extend cycle life may not be followed in practice if you leave the pack charged up all the time.
 
Thankyou Dnmun,

I will keep that in mind... most likely i will cycle the pack everyday ( to uni and back :D).
Hmm to make things more simplistic lets omit charging to 4.05v per cell and instead charge to 4.2v per cell.

Jazzman
 
that is the most common. all of the laptop cells are charged and balanced to 4.20V.

but the reason they die because of it is because they are usually plugged in all the time and it is the length of time the cell is charged up and not the final voltage that determines cycle life.

i have tried to get people to listen to that professor's lecture where he explains that but nobody ever listens to it.

my order to bestechpower is waiting for the end of the chinese new year now. i did order some of the D132 but i think the D167 is the best deal for the money on 16S and a little more power capability.

you always wanna order two so you have a backup and don't have to pay shipping twice. shipping is the biggest cost.
 
"sigh" i know your pain... so many people complain when their battery dies after 3 months :(
I've always tried disconnect my laptop (macbook) once it's charged :p (so it rarely sits at its' max voltage)
I'm pushing about 930cycles ATM on Li-ion :) but sadly it's down too 74% of it's original capacity... but still pretty good for about 2.5 years of use and being manufactured in 2010 :)

Hmm i'll look into the D167 I'm assuming that you can just use 14s instead of the full 16s :)

I've also got to find a suitable DC breaker for 32amps any ideas ?
 
i never use breakers. the BMS will work better. 900 cycles on li ion is a record.

i always order the full complement and you can use any number of cells up to the full 16S and they make a 20S version too for $6 more.
 
With Regards to a D167 from Bestech power: http://www.bestechpower.com/592v16spcmbmspcbforli-ionli-polymerbatterypack/PCB-D167.html
How do i change the current handling (continuos and peak) capacity of this ??
I'm assuming that i just remove some Mosfets ??

Jazzman
 
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