Can passive protection be used as a sole explosion protection scheme?

The two main challenges in using passive protection methodology are design constraints for the enclosure and lack of validation data to support calculation methodology. These challenges make it difficult to obtain a feasible design for deflagration venting of ESS enclosures as the sole explosion protection scheme for most configurations.

Should deflagration venting be used as passive explosion protection?

In general, using deflagration venting as passive explosion protection in addition to an active system has multiple benefits due to the nature of the battery failure event, which involves a rapid release of flammable gases.

What are the risks of a battery explosion?

itigate the risks of explosionandfire,can cause adjacent cells to fail and trigger the chain such as the use of explosion-proof panels. reaction that will spread throughout the battery and Detecting and releasing flammable gases are two can quickly destroy the entire battery energy sto age measures discussed in NFPA85520

Why are explosion hazards a concern for ESS batteries?

For grid-scale and residential applications of ESS, explosion hazards are a significant concern due to the propensity of lithium-ion batteries to undergo thermal runaway, which causes a release of flammable gases composed of hydrogen, hydrocarbons (e.g. methane, ethylene, etc.), carbon monoxide, and carbon dioxide.

How does ESS design affect fire and explosion safety?

Several competing design objectives for ESS can detrimentally affect fire and explosion safety, including the hot aisle/cold aisle layout for cooling efficiency, protection against water and dust ingress into the enclosure, and the use of larger cells with increased energy density.

What are the different types of explosion control options for ESS?

The two types of explosion control options for ESS, NFPA 68 deflagration venting and NFPA 69 exhaust ventilation, are based on a design basis determined from UL 9540A test data. This testing is meant to provide baseline data for the analysis and is generally extrapolated to a sufficiently conservative hazard scenario for the ESS installation.