Abstract
Hydrogen and oxygen produced by electrolysis during the charging of lead-acid batteries must be vented from the battery case. The accidental ignition of these gases can produce a flame which propagates back into the battery case causing an explosion. To minimise this risk, various flame-arresting vent plug designs have been marketed. To assess the performance of these, appropriate test equipment and procedures have been developed and are described in this paper. The concept of a danger zone to characterise the volume above the vent where the charge gases can be ignited is introduced. Typical results for the danger zone above an isolated hole are given.
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