Portable battery for mine-workings has electronic protective circuit - with battery block and electronic block glued together then mounted in common casing with lid

A battery supply for electrical equipment used in mining where there is a risk of explosion consists of an electronic circuit on the input side of the battery terminals, the batteries and that part of the electronic system which is not intrinsically safe are all housed in one common housing, which contains the wiring and is then cast into a block. The battery or batteries are initially embedded in a battery casing, and the electronic system in a separate electronic casing of silicone rubber cast material, both these casings are then bonded together using a double-sided adhesive strip and are pushed together into an overall casing having a closure lid and actuator. Pref. the battery cables lead out from the battery casing through a hole in the bonding surface and pass through a corresp. hole in the electronic casing and are soldered to the electronic mounting plate. This arrangement leads to a reduction in the voltage drop caused by the electronic circuit, which with previous arrangements equals about 2.5V. At the same time, the battery can be easily removed and replaced by a new one by removing the first 1 centimetre thickness of the cast material in the electronic casing, detaching the battery cables and sepg. the two casings at the adhesive joint.