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Some excellent clues here, +1 on this post, and more than likely a 2¢ resistor failure rather than an actual bad cell.[off topic mode/]When GS Yuasa was being questioned by the NTSB about the Boeing 787 battery incidents they testified to having no cell failures in over 10,000 cells used by other customers. The miev LEV-50 cell is a lower capacity cell of similar jelly-roll design to the 787 cells (LVP-65, CC at 1C max/CV at 4.025 with current taper to C/20). Boeing claimed that overcharging was not possibly the culprit because the FDR showed that the battery buss voltage was held at 32 volts by the Securaplane charger. i looked at the FDR data also and found that it showed 1-2 amps of current flow into the battery all the time, (such as is done in trickle-charging ?). Securaplane's charger patent is based upon a Ni-Cd cell chemistry charging scheme. [/mode]http://www.google.com/patents/US5780994
Some excellent clues here, +1 on this post, and more than likely a 2¢ resistor failure rather than an actual bad cell.
[off topic mode/]
When GS Yuasa was being questioned by the NTSB about the Boeing 787 battery incidents they testified to having no cell failures in over 10,000 cells used by other customers. The miev LEV-50 cell is a lower capacity cell of similar jelly-roll design to the 787 cells (LVP-65, CC at 1C max/CV at 4.025 with current taper to C/20).
Boeing claimed that overcharging was not possibly the culprit because the FDR showed that the battery buss voltage was held at 32 volts by the Securaplane charger. i looked at the FDR data also and found that it showed 1-2 amps of current flow into the battery all the time, (such as is done in trickle-charging ?). Securaplane's charger patent is based upon a Ni-Cd cell chemistry charging scheme.
[/mode]http://www.google.com/patents/US5780994
