Did you see the DigiTimes story last week?
“Although the major cause of the recent Sony battery recall has not been revealed, passive component makers suspect that cracking of the multi-layer ceramic capacitors (MLCCs) or the inappropriate use of negative temperature coefficient (NTC) resistors caused the batteries to overheat.
“Sources at US-based passive component makers commented that overheating may have originated in the electrical insulation of the batteries and that MLCC and other passive components should not be the major cause of the incident.
“Some Taiwan-based makers, on the other hand, suspect that the adopted MLCCs had been cracked by printed circuit board (PCB) assembly, and that this may have caused an unstable flow of current, leading eventually to overheating.”
So some are suggesting that lead-free is behind the Sony battery failures. As Kathy Nargi-Toth, my colleague at Printed Circuit Design and Manufacture, says, “Make that link and we might have an interesting situation.”