787 Batteries and Chargers - Part 1

[saptzae]

The main battery at BOS shows cell deterioration, as per CT report.

The NTSB battery block diagram does not show cell balancing.

I was thinking that the block diagram is simplified. Perhaps block diagram is factual and battery has no cell balancing.

Without cell balancing, individual cell voltages can not be limited, and cell bulging and failure is to be expected.

Edit2:
If so, cell deterioration for lack of balancing, would be the long elusive cause of the Primary failure, the cell short.

Edit:
@Machinbird
General per cell temp monitoring will be of benefit to cell condition monitoring.

As to parallel charging. Just adds complexity at zero benefit, sorry.

@RR_NDB
Parallel low current discharge is whats needed to balance cells.