Hi,
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There are 11 wires to the 10S pack, the red to the positive end, black to negative end, the intermediate ones
in order to all the cell junctions in the pack - the pack should already have the connector to match for this.
TomGeorge:
Hi,
Can you please attach your images, the forum editor will insert them into your post so we can view them here.
Some platforms make it difficult to view images off forum.
Thanks.. Tom...
Done
MarkT:
There are 11 wires to the 10S pack, the red to the positive end, black to negative end, the intermediate ones
in order to all the cell junctions in the pack - the pack should already have the connector to match for this.
This is my first time working with BMS and I am very cautious not to accidentally blow up any of the 18650s, to be on the safe side I would like to have the wiring diagram, if possible of course.
The individual cell voltage of cell # 3 in 10S1P PACK-1, would NOT be the same as the individual cell voltage of
cell # 3 in 10S1P PACK-2 because the CURRENT PATH for PACK-1 is THROUGH the PACK-1 CELLS, NOT through
the PACK-2 cells, so the PACK-1 BMS does NOT CARE what is going on with any OTHER 10S1P PACKS that might
be in PARALLEL because the only points of CONTINUITY are the points FROM ONE PACK OUTPUT V+ to the OTHER pack OUTPUT V+ (and to ALL OTHER PACK output V+) and likewise for the PACK V- points. Consequently, for
'n' 10S1P packs in PARALLEL, there are 'n' CURRENT PATHS (through the cells of each pack ) and the BMS for
EACH pack only cares about the voltage on IT'S cells (not about the voltage on any OTHER packs cells).
Short version. One BMS per 10S1P pack.
You could, if you wanted, call this a Basic Electronics 101 quiz test, since the solution is simple and basic.
"It's not complicated..." (as they say)
To be clear, once you parallel 'n' 10S1P packs (EACH with it's OWN BMS), the final parallel pack is a 10SnP
PACK |where 'n' = the number of packs in parallel. But techically it would be n*10S1P. (which would tell anyone who understands what that means that
there are NO CELLS IN PARALLEL. There are only
PACKS in parallel, an important distnction)
I do not actually know how LIPO batteries are constructed so I do not know if an off the shelf 4S2P pack is
actually 4 parallel pairs of cells, such that the charger treats the two #3 cell batteries as one or if in fact there
are two wires for each cell on the balancer connector. When you look at the balancer connectors you see that
the number of pins is irrespective of how many packs are in parallel. It says '4S' and there is no reference to the
'n' number for the P , which tells you that the cells are paralleled FIRST , and THEN wired in SERIES , so a 4S2P
charger CANNOT actually monitor INDIVIDUAL cells like your BMS, because a 4S2P is 4 PAIRS of parallel cells
wired in SERIES. Your battery pack on the other hand when managed with the linked BMS , will monitor EACH
and EVERY cell and the BMS's for the OTHER 10S1P packs will monitor THEIR individual cells. This is a much
more desirable scenario than using parallel packs that parallel their cells.
Based on what I searched, in other BMS' the 2 pads named "P+" and "P-" are for the input charger (42v 8A).
But for the "B-" I did not understand what is that? and how to use that?
The "P+" and "P-" is not clear in here, so I am not quite sure if those 2 unclear-pads are actual P+ and P- .
No practical experience, but I thought a BMS should be able to divert the charge current of a full cell.
This small module can only take cell currents of 50mA...
Seems way to low for an 8Amp charger.
Leo..
