heathyoung
100 kW
I'm looking for the best way to charge a setup of Konion 18650V's - 6S18P (22.2V @ 27AH).
From what I have determined from the datasheet, they need to be charged 4.2V (max) at 1A (max) per cell.
If they are charged to a lower level, then they also have a longer life too apparently without sacrificing too much capacity (ie. charge to 4.15v)?
I'm looking at this power supply (meanwell SP-200) http://www.computronics.com.au/meanwell/sp-200/ - which uses a constant current overload protection rather than the more common 'hiccup' mode - but doesn't use foldback protection like their battery charger units (which are too big!).
Is this supply adequate (ie. is the current limiting appropriate for a charger?) - 8.4A, can be adjusted to 24.9V (for 4.15V per cell) - and fits nicely in the Topeak bag I have. I havn't determined the leakage current of the power supply yet (as to whether it can be left permanently hooked up to the batteries or not)
How is end of charge determined - as you reach 4.15V, the graph seems to approach zero - can it be left on as a trickle (or will it eventually reach zero + leakage current across the batteries) or is there a recommended charge end point determination (eg. 100ma per cell) that should be adhered to?
Even though they have a reputation for self balancing, can this be relied upon - as long as they are charged (4.15~4.2) and discharged (3.0V) within their safe limits? Or should I get a 6S balancer for use after charging - I do remember someone mentioning that they don't hold a surface charge well like LiPo, and tend to sit at their nominal voltage (3.7V?).
I'm probably going to assemble the pack with copper foil/shim to parallel all of the cells together, and use nylon cutting board for a top/base of the battery (to protect it from damage/rubbing through the bag/rack and shorting out) with the power supply bolted onto the top of the battery, and have the whole thing removable from the rack (with andersons for quick removal) for security and opportunity charging.
Thoughts? Comments?
From what I have determined from the datasheet, they need to be charged 4.2V (max) at 1A (max) per cell.
If they are charged to a lower level, then they also have a longer life too apparently without sacrificing too much capacity (ie. charge to 4.15v)?
I'm looking at this power supply (meanwell SP-200) http://www.computronics.com.au/meanwell/sp-200/ - which uses a constant current overload protection rather than the more common 'hiccup' mode - but doesn't use foldback protection like their battery charger units (which are too big!).
Is this supply adequate (ie. is the current limiting appropriate for a charger?) - 8.4A, can be adjusted to 24.9V (for 4.15V per cell) - and fits nicely in the Topeak bag I have. I havn't determined the leakage current of the power supply yet (as to whether it can be left permanently hooked up to the batteries or not)
How is end of charge determined - as you reach 4.15V, the graph seems to approach zero - can it be left on as a trickle (or will it eventually reach zero + leakage current across the batteries) or is there a recommended charge end point determination (eg. 100ma per cell) that should be adhered to?
Even though they have a reputation for self balancing, can this be relied upon - as long as they are charged (4.15~4.2) and discharged (3.0V) within their safe limits? Or should I get a 6S balancer for use after charging - I do remember someone mentioning that they don't hold a surface charge well like LiPo, and tend to sit at their nominal voltage (3.7V?).
I'm probably going to assemble the pack with copper foil/shim to parallel all of the cells together, and use nylon cutting board for a top/base of the battery (to protect it from damage/rubbing through the bag/rack and shorting out) with the power supply bolted onto the top of the battery, and have the whole thing removable from the rack (with andersons for quick removal) for security and opportunity charging.
Thoughts? Comments?
