To enable the explosion protection regulations to describe the potential risks of this technology in greater detail, studies must be undertaken in order to provide a comprehensive assessment of these risks; these studies must look into the various risks associated with the different types of protection.
For the purpose of explosion protection, devices are assessed on the basis of the zones in which they are to be used. For Zone 2, the device is deemed "safe" if no potential source of ignition exists under normal operating conditions.
Miretti Group is working with experienced testing laboratories to test and develop explosion proof solutions for Li-Ion batteries. In order to explain the engineering principles on which it is based the safety of Miretti explosion protected Li- Ion Batteries, Miretti would like to elaborate the following comments.
The Ex d enclosure solution is, in Miretti’ s opinion, as of now the most practically feasible explosion proof protection for Li-Ion batteries.
The Li-Ion battery may be subjected to high risk of explosion if for example it is selected a wrong chemical type for the cell or an improper mechanical construction design and distancing between the cells, thus making the thermal runaway effect more likely to happen.
The cell or battery is accommodated in a case, or enclosure, that is able to withstand the explosion of a combustible gas from within. Annex G of IEC/EN 60079-2, a standard on protection by pressurised enclosures, describes the use of cells and batteries.