Thermal Stability and Phase Transition by Photoacoustic Signal Analysis

A battery of the type having electrolyte therein, comprising a case defining at least one electrolyte containing cell, and a primary cover bonded to the case. The primary cover has a barrel extending into the electrolyte cell. A secondary cover is bonded to the primary cover top, and includes an aperture concentric with the primary cover barrel. A baffling plug is disposed in the secondary cover aperture and extends into the barrel. The baffling plug has a lid with a bottom, an inner tubular splash guard extending away from said lid bottom, an outer splash guard concentrically spaced from said inner tubular splash guard. A retaining member formed part of the plug base retains the plug in the aperture, and seals the aperture to prevent the escape of the electrolyte.