Parallell charging SHOULD be adopted
Hi,
I will post ASAP the block diagram of a PARALLEL CHARGING WITH BITE designed during the last days.
All considerations like cost, reliability, MANDATORY K.I.S.S. approach, etc. was taken into account.
The use of SERIES CHARGING (evident from the pictures) to a battery with adjacent cells (thermally speaking) is imho a recipe for problems.
The location of the batteries in close vicinity to electronic modules and THE PLACEMENT OF TWO DENSE PCB´S in the same chamber of the cells SUGGEST the DECISION MAKING ON USE OF Li Ion was based on:
CELLS WIL NOT FAIL, WILL NOT go to THERMAL RUNAWAY AND BATTERIES WILL BETTER THAN PREVIOUS "STANDARDS" (Ni Cd).
This imho an ERROR, was partly made in "high rocks" of Boeing as we can imagine.
Sad and concerning.
PS
Parallel charging can be done with the cells connected in series. Additionally you may be able to "help" a less capable cell to deliver when battery is being used (as we know, rarely). Imagine 8 (identical) circuits (5 Amps avg, 20 Amps max) connected (floating, obviously) directly to ea. cell).
You can balance easily, manage and incorporate a very capable BITE to track cell performance)
Last edited by RR_NDB; 30th Jan 2013 at 15:39.
Reason: Add "partly" and PS contents