Posted by John G. Hasler on December 27, 2008 at 05:25:23 from (72.160.253.193):
In Reply to: Re: jump starter posted by old on December 26, 2008 at 20:51:42:
Batteries explode due to the electrolyte boiling inside when they are shorted, not due to the ignition of the tiny amount of hydrogen present.
When I was with Sarns (a manufacturer of medical life-support equipment now part of 3M) one of the products I designed the electronics for was a "UPS" for hospital operating rooms: four truck batteries and a solid-state 110VAC inverter in a stainless-steel case on wheels. Because the product was for hospital use we had to investigate every possible failure mode, including hydrogen explosions. We found, through both calculation and experiment, that it was impossible to accumulate an explosive mixture even inside the closed case with the charging circuit jiggered to overcharge. The amount of gas is too small and it diffuses away too fast. There can be an explosive mixture present in the headspace inside a cell, but you'd have to get a spark in there and even then the amount of energy released would barely pop the cap.
Batteries explode when people short them and the results are much more spectacular than the little pop you'd get from a bit of H2.
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