On (wrong) assumptions certainly made during design
Hi,
mm43,
Letīs put it crystal clear:
Itīs unbelievable but it seems the designers of the battery didnīt consider cell heat. NTSB model is: Short(s) generated heat and a "positive feedback" started (the so called, Thermal Runaway) leading to the destruction of the battery with other much more dangerous cosequences like FIRE.
This as i understood is the WHAT, Deborah mentioned in first briefing. It remain the WHY. We expect this in next interim and their looking to "surounding electric environment" is a logical step in the investigation. I was concerned with the no mention of cell voltages. If this data was lost (i suspect, was) the shorts could be for more than one reason. Indeed temp.(of EACH cell), voltage, impedance are intrinsically related.