Evaluation of explosion hazards The battery pack may undergo an explosion as a result of the ignition of venting gases mixed with the air. Thus, in order to evaluate the explosion risk in the void during TR, the LEL of venting gas mixture was calculated and compared with the contents of venting gases during TR propagation.
0 < τ ≤ 1: Since the gas concentrations and LEL fluctuate and change periodically in the opposite trend, the battery pack is under explosion risk during venting while it is out of danger during the time gaps of two venting events, and this process occurs periodically with TR propagation.
When the ventilation rate was high as 150 L·h −1, the duration of the battery pack under explosion risk is just approximately 28 s, which indicated such a ventilation rate is capable of the elimination of explosion or fire hazard after TR. Fig. 11.
When looking at the different parts of a battery pack, several key components must be analyzed to gain insight into the pack’s performance. These components include the battery cells, pack structure, thermal management system, and control electronics.
Quantifying the explosion risk for various battery pack configurations. Thermal runaway (TR) seriously hinders the wide application of lithium-ion batteries. One of the most significant hazards of TR lies in the emission of flammable gases, which might cause explosion in the battery pack.
EV batteries are typically divided in three levels namely pack-, module- and cell level. In this project the study will be limited to focus on pack- and module level. Concentration is on the hardware of a battery pack. Access information due high degree of confidentiality.