Explosive overcharge method

In this investigation Sandia examined the use of aqueous foam for blast mitigation. The foam can be used with the shaped charge burster detonation method or to mitigate the blast from an explosive overcharge. 

Field failures typically represent unprovoked battery explosions and according to industry experts such events are rare and is estimated that one in 10 million Li-ion batteries fails that way [10]. Field failures are more challenging to reproduce and study in a lab because they happen so infrequently. Moreover, these incidents stand in contrast to failures of abuse-tolerance tests, in which batteries are methodically subjected to extreme conditions such as uncontrolled heating, overcharging, crushing or puncturing to assess the battery s response. Another difficulty in analyzing the causes of spontaneous failures is that batteries that fail in the field come from lots that have already passed abuse and reliability tests, and they appear to have worked normally. 

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